TECHNICAL FIELD
The present disclosure relates to a synergistic composition comprising cationic fluorocarbon along with fluorocarbon extender  anionic thickener and anionic binder  wherein the composition is printed on fabric followed by curing to obtain fabric with invisible print. The present disclosure further relates to a method of obtaining said composition along with a process of obtaining the printed fabric/garment. The instant disclosure also relates to the treated fabric/garment and a kit to obtain the same.

BACK GROUND AND PRIOR ART
Screen printing is arguably the most versatile of all printing processes. It can be used to print on a wide variety of substrates  including paper  paperboard  plastics  glass  metals  fabrics  and many other materials  including paper  plastics  glass  metals  nylon and cotton. Some common products from the screen printing industry include posters  labels  decals  sign age and all types of textiles and electronic circuit boards. The advantage of screen printing over other print processes is that the press can print on substrates of any shape  thickness and size.

A significant characteristic of screen printing is that a greater thickness of the ink can be applied to the substrate than is possible with other printing techniques. This allows for some very interesting effects that are not possible using other printing methods. Because of the simplicity of the application process  a wider range of inks and dyes are available for use in screen printing than for use in any other printing process.

The prior art literature provides an object which in its outer surface contains a colour forming composition which comprises a solvent absorbing material that is generally a polymer  a colour former compounded with the solvent absorbing material  where the colour former functions as a metal chelating agent and metal ions capable of forming a chelate complex with the colour former as the solvent absorbing material absorb solvent  resulting in a detectable colour change of the composition.

In present disclosure there is no requirement of the use of colour forming material. Further  even without the colour forming material one can see the prints distinctly visible once it is exposed to water which is invisible otherwise. The chemistry used in the instant disclosure is simple and cost effective. Wash durability in the present disclosure can be committed where as in the prior art one cannot get wash durability. The instant disclosure also uses screen printing with the instant composition on textiles.

STATEMENT OF THE DISCLOSURE
Accordingly  the present disclosure relates to a synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder; a method to obtain synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder  said method comprising act of combining the cationic fluorocarbon  the fluorocarbon extender  the anionic thickener and the anionic binder in water to obtain the synergistic composition; a method for obtaining fabric with invisible print  wherein the print on the fabric is visible upon contact with solvent  said method comprising acts of –a) treating a pre-treated fabric with synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder  and b) curing the treated fabric to obtain the fabric with invisible print and optionally contacting the print with solvent for visualizing the print; a fabric or garment with invisible print  wherein the print on the fabric or the garment is optionally visible upon contact with solvent  said print is obtained by treating the fabric with the above synergistic composition; and a kit for obtaining fabric or garment with invisible print  said kit comprising synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder  and instruction manual.

BRIEF DESCRIPTION OF ACCOMPANYING FIGURES
Figure 1 represents how fluorocarbon is acted on fabric surface when printed with the instant composition.
Figure 2 represents how printed fabric appears after applying water.
Figure 3 represents a rotary screen printing.

DETAILED DESCRIPTION
The present disclosure relates to a synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder.
In an embodiment of the present disclosure  the cationic fluorocarbon is Fluoroalkane selected from group comprising perfluoro Butadiene  perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender is aliphatic polyurethane selected from group comprising Hexamethylene diisocyanate and isophorone diiosocyanate; the anionic thickener is selected from group comprising polymeric emulsion of sodium carboxy methyl cellulose and polymeric emulsion of Sodium Alginate; and the anionic binder is self linking Acrylic based co-polymer selected from group comprising 2 hydroxy methyl methacrylate and 2 hydroxy butyl methacrylate.

In another embodiment of the present disclosure  the cationic fluorocarbon has concentration ranging from about 90g/kg to about 120g/kg  preferably about 100g/L; the fluorocarbon extender has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; the anionic thickener has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; and the anionic binder has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg.

In yet another embodiment of the present disclosure  the composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs.

In still another embodiment of the present disclosure  the composition is maintained at pH ranging from about 6 to about 8  preferably about 7; and the composition is formulated into paste form with water.

The present disclosure relates to a method to obtain synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder  said method comprising act of combining the cationic fluorocarbon  the fluorocarbon extender  the anionic thickener and the anionic binder in water to obtain the synergistic composition.

In an embodiment of the present disclosure  the cationic fluorocarbon is Fluoroalkane selected from group comprising perfluoro Butadiene  perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender is aliphatic polyurethane selected from group comprising Hexamethylene diisocyanate and isophorone diiosocyanate; the anionic thickener is selected from group comprising polymeric emulsion of sodium carboxy methyl cellulose and polymeric emulsion of Sodium Alginate; and the anionic binder is self linking Acrylic based co-polymer selected from group comprising 2 hydroxy methyl methacrylate and 2 hydroxy butyl methacrylate.

In another embodiment of the present disclosure  the cationic fluorocarbon has concentration ranging from about 90g/kg to about 120g/kg  preferably about 100g/L; the fluorocarbon extender has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; the anionic thickener has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; and the anionic binder has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg.

In yet another embodiment of the present disclosure  the composition is maintained at pH ranging from about 6 to about 8  preferably about 7; and the composition is formulated into paste form withwater.

The present disclosure relates to a method for obtaining fabric with invisible print  wherein the print on the fabric is visible upon contact with solvent  said method comprising acts of:
a. treating a pre-treated fabric with synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder; and
b. curing the treated fabric to obtain the fabric with invisible print and optionally contacting the print with solvent for visualizing the print.

In an embodiment of the present disclosure  the fabric is pre-treated in pre-treatment range machine and comprise acts selected from group of singeing  desizing  scouring  bleaching  neutralizing  mercerising  heat setting and dyeing or any combinations thereof.

In another embodiment of the present disclosure  the singeing is carried out at speed ranging from about 75 m/min to about 150m/min  distance between burner and the fabric ranging from about 6 mm to about 20 mm and intensity of flame ranging from about 50 000 kcal to about 80000 kcal; the desizing is enzyme desizing by Alpha Amylase at concentration ranging from about 0.5g/L to about 2g/L; the scouring is carried out using component selected from group comprising Caustic Soda  surfactant  chelating agent  sequestering agent  detergent and soda ash or any combinations thereof; and the bleaching is carried out by Hydrogen Peroxide in water at concentration ranging from about 5 ml/L to about 10 ml/L of water.

In yet another embodiment of the present disclosure  the neutralizing is carried out using acetic acid at concentration ranging from about 0.5g/l to about 1.5g/l; and the mercerising is carried out using caustic soda at concentration ranging from about 220 g/L to about 250 g/L.

In still another embodiment of the present disclosure  the heat setting is carried out at temperature ranging from about 155°C to about 230°C for time duration ranging from about 10 seconds to about 70 seconds; and the dyeing is carried out in machine selected from group comprising cold pad batch machine  continuous dyeing range machine and Jet dyeing machine.

In still another embodiment of the present disclosure  the caustic soda is at concentration ranging from about 3g/L to about 5g/L; the surfactants are selected from group comprising alkyl sulphates  alkyl ethoxylate sulphates and fatty acids and are at concentration ranging from about 0.5g/L to about 1.5g/L; the chelating agents are selected from group comprising ethylene diamine and methylamine and are at concentration ranging from about 0.3g/L to about 2 g/L; the sequestering agent are selected from group comprising Ethylenediaminetetraacetic acid  Ethylenediamine-N N""-disuccinic acid and S  S’-ethylenediamine disuccinic acid and are at concentration ranging from about 0.5 g/l to about 1.5 g/l; the detergent are selected from group comprising Alkyl benzine sulphonate  polyoxyethyline and octyl-thioglucoside and are at concentration ranging from about 1 g/l to about 2.5 g/l; and the soda ash is at concentration ranging from about 1.5 g/l to about 5 g/l.

In still another embodiment of the present disclosure  the treating is screen printing; and the curing is carried out at temperature ranging from about 150°C to about 160°C  preferably about 155°C  for time duration ranging from about 2 minutes to about 5 minutes  preferably about 3 minutes.
In still another embodiment of the present disclosure  the solvent is selected from group comprising water  oil and petroleum based solvent including acetone or percholoro ethylene or carbon tetrachloride; or any combinations thereof.

In still another embodiment of the present disclosure  the cationic fluorocarbon is Fluoroalkane selected from group comprising perfluoro Butadiene  perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender is aliphatic polyurethane selected from group comprising Hexamethylene diisocyanate and isophorone diiosocyanate; the anionic thickener is selected from group comprising polymeric emulsion of sodium carboxy methyl cellulose and polymeric emulsion of Sodium Alginate; and the anionic binder is self linking Acrylic based co-polymer selected from group comprising 2 hydroxy methyl methacrylate and 2 hydroxy butyl methacrylate.

In still another embodiment of the present disclosure  the cationic fluorocarbon has concentration ranging from about 90g/kg to about 120g/kg  preferably about 100g/L; the fluorocarbon extender has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; the anionic thickener has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; and the anionic binder has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg.

In still another embodiment of the present disclosure  the composition is maintained at pH ranging from about 6 to about 8  preferably about 7; and the composition is formulated into paste form with water.

The present disclosure relates to a fabric or garment with invisible print  wherein the print on the fabric or the garment is optionally visible upon contact with solvent  said print is obtained by treating the fabric with the above synergistic composition.

In an embodiment of the present disclosure  the fabric is selected from group comprising cotton and synthetic fabric  preferably nylon  acrylic and polyester; or any combinations thereof.

In another embodiment of the present disclosure  the print is water and oil repellent; and the solvent is selected from group comprising water  oil and petroleum based solvent including acetone or percholoro ethylene or carbon tetrachloride; or any combinations thereof.

The present disclosure relates to a kit for obtaining fabric or garment with invisible print  said kit comprising synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder; and instruction manual.

The present disclosure relates to a synergistic composition comprising Cationic Fluorocarbon  Fluorocarbon extender  Anionic thickener and Anionic binder. The instant disclosure also provides for a method of arriving at a fabric/garment with invisible print by the process of screen printing the composition onto the fabric and curing to obtain the fabric with invisible print. In the dry state  the prints are not visible on the fabric/garment. However  on contact with solvent such as water or volatile petroleum based solvents like Acetone  percholoro ethylene and carbon tetrachloride  the portion of the fabric/garment treated with the instant composition repels water and the untreated portion absorbs water and thus the print appears. In an embodiment of the present disclosure  the fabric with invisible print is obtained by screen printing the pre-treated fabric with the present composition followed by curing to fix the fluorocarbon on the fabric surface.

In an embodiment of the present disclosure  the complete process of arriving at the fabric with invisible print involves the following steps: fabric pre-treatment comprising the steps of singeing  enzyme desizing  scouring  bleaching  neutralising  mercerising  heat setting (only for nylon  acrylic and polyester) and optionally dyeing the fabric. It is followed by screen printing of the instant composition onto the fabric  curing to obtain the fabric with invisible print and optionally stitching the fabric to obtain a desired garment with invisible print. The garment thus obtained has invisible print that appears on contact with solvent  such as water or volatile petroleum based solvents like Acetone  percholoro ethylene and carbon tetrachloride.

In another embodiment of the present disclosure  the pre-treatment of the fabric is a mandatory step in the present protocol to arrive at the printed fabric. The pre-treating step is followed by the treating step in which the fabric is screen printed with the instant composition which is followed by curing of the fabric to obtain the finalised product.

In an embodiment of the present disclosure  fabric such as cotton  synthetic fabric such as nylon  acrylic or polyester can be subjected to the technique of the instant disclosure. Further  synthetic fibres such as acrylic  nylon and polyester are made through polymerization process. Polyester and nylon are the products of step growth polymerization process. Nylon is a polyamide fibre whereas polyester is poly ethylene terepthalate.

In another embodiment  the present disclosure further relates to screen printing the pre-treated fabric with the instant synergistic composition comprising anionic thickener  cationic fluorocarbon  fluorocarbon extender and anionic binder to obtain the printed fabric. This is followed by curing the printed fabric to obtain the fabric with invisible print and optionally contacting said print with solvent for visualizing the print.

In another embodiment  the fluorocarbon used here is not part of a colour forming group and hence it repels water when it is exposed to it. The other parts in the fabric which are not printed  absorb water and look darker than the printed portion and thus a shade difference appears making the print visible.

In yet another embodiment of the present disclosure  the anionic thickener is hydro phobically-modified highly polymeric  synthetic thickeners based on acrylate. Rheology modifier are used in the present disclosure  which is an additive used to modify the viscosity of material. They are nothing but thickening agent. This anionic thickener gives a good film build with good flow and leveling.

In an embodiment of the present disclosure  the anionic thickener is chosen from group comprising polymeric emulsion of sodium carboxy methyl cellulose and polymeric emulsion of sodium alginate. The Anionic thickener used in the composition of the present disclosure is in the range of about 8 g/L to about 15 g/L  preferably 10 g/L. In an embodiment  the thickener preferably used in the present disclosure is Sodium alginate.
In yet another embodiment of the present disclosure  the cationic fluorocarbon is polymer of fluorocarbon which is APEO [Alkylphenol ethoxylates] and solvent free  and is applied to get oil  water and soil repellent property in fabric/garment. The fluorocarbons used in the present disclosure are Fluoroalkanes that contain only single bonds and are more chemically and thermally stable than only alkanes. However  fluorocarbons with double bonds (fluoro-alkenes) are more reactive than their corresponding hydrocarbons. Specifically  Perfluoro Octanic acid is employed in the instant disclosure.

In an embodiment of the present disclosure  the cationic fluorocarbon used is fluoroalkane selected from group comprising poly tetra fluoro ethylene  perfluoro butadiene  perfluoroalkyl ethyl acrylate and Perfluorooctanoic acid. The Cationic fluorocarbon used in the composition of the present disclosure is in the range of about 90 g/L to about 120 g/L. In an embodiment of the present disclosure  the fluorocarbon preferably used is Perfluoro Octanic Acid.

In yet another embodiment of the present disclosure  the fluorocarbon extender is aliphatic polyurethane. It is a hydrophobic complex that reduces consumption of fluorocarbon. It has no effect on oil repellency  but improves water repellency. The aliphatic polyurethanes employed in the instant disclosure are Hexamethylene diisocyanate and isophorone diisocyanate. The fluorocarbon extender used in the composition of the present disclosure is in the range of about 8 g/L to about 15 g/L. In an embodiment of the present disclosure  the extender preferably used is Hexamethylene diisocyanate.

In yet another embodiment of the present disclosure  the anionic binder is self cross-linking acrylic based co-polymer dispersion component. It helps in making cross-links between fluorocarbon and fabric. Along with the fluorocarbon extender  it helps to make the fabric more wash durable. Anionic thickener and anionic binder have been used in the present disclosure as these react easily with cationic fluorocarbon. In an embodiment of the present disclosure  the anionic binder is preferably 2-hydroxy methyl methacrylate. The functionality is obtained after acryl amide is reacted with formaldehyde. The binders containing the substituted acryl amide groups have self-cross linking properties. The Anionic binder used in the composition of the present disclosure is in the range of about 8 g/L to about 15 g/L. The binders that are used in the present disclosure are 2-hydroxy methyl methacrylate and 2 hydroxy butyl methacrylate..

In yet another embodiment of the present disclosure  the solvent employed to visualize the hidden prints is preferably water or volatile petroleum based solvents like Acetone  percholoro ethylene and carbon tetrachloride. Water used to arrive at the composition of the instant disclosure is in the range of about 850 g/kg to about 870 g/kg.

The present disclosure relates to a composition which is a synergistic composition. Fluorocarbon is main constituent of the composition and imparts water and oil repellency  Extender imparts wash durability  Anionic Thickener is required to make the printing paste and the Anionic Binder is needed to fix the printing paste properly to the fabric. Hence  each of the components of the instant disclosure imparts a specific property to the composition which is synergistic in nature.
In yet another embodiment of the present disclosure  the viscosity of the instant disclosure is measured. Viscosity is measure of the resistance of a fluid which is deformed by either shear stress or tensile stress. In other words  viscosity is thickness or internal friction. In the present disclosure  the print chemical viscosity is 10000cPs  which helps the composition to retain its shape at the time of printing.

Printing Process Overview:
• Cotton:
In an embodiment of the present disclosure  fabric preparation or pre-treating of the fabric such as cotton involves the following steps in sequential order:
- Singeing 
- Enzyme Desizing 
- Scouring 
- Bleaching 
- Neutralizing 
- Mercerizing 
- Heat Setting and
- Optionally dyeing to make base color if required (or it can be done on white base also)
• Polyester/nylon:
In an embodiment of the present disclosure  fabric preparation/pre-treating of polyester/nylon involves the following steps:
- heat setting
- desizing 
- scouring 
- optionally dyeing if required (or printing can be done on white base)

However  there is no need of mercerization step in polyester and nylon.

The composition of the instant disclosure is also provided in the form of a kit along with an instruction manual. The kit contains Cationic Fluorocarbon  Fluorocarbon extender  Anionic thickener  Anionic binder and instruction manual.

The present disclosure is further described with the help of the following examples and figures. However  these examples should not be construed to limit the scope of the disclosure.

• EXAMPLES
EXAMPLE 1:
In an embodiment of the present disclosure  the process of arriving at the synergistic composition comprising Cationic Fluorocarbon  Fluorocarbon extender  Anionic thickener and Anionic binder of the instant disclosure is described. The ingredients/components for the preparation of the instant composition are provided below along with their respective concentration values.

Water: about 850 g/kg to about 870 g/kg
Cationic fluorocarbon: about 90 g/kg to about 120 g/kg
Fluorocarbon extender: about 8 g/kg to about 15 g/kg
Anionic thickener: about 8 g/kg to about 15 g/kg
Anionic binder: about 8 g/kg to about 15 g/kg

The above mentioned constituents  in the abovementioned respective concentrations  when dissolved in water at room temperature ranging from about 25°C to about 30°C constitutes the instant composition. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs.

In an embodiment of the present disclosure  in the instant composition  the cationic fluorocarbon used is Per fluoro Octanic Acid at about 100g/kg  the fluorocarbon extender used is hexamethylene diisocyanate at about 10g/kg  anionic thickener used is polymeric emulsion of sodium alginate at about 10g/kg and the anionic binder used is 2-hydroxy methyl methacrylate amide at about 10g/kg. The pH of the composition is maintained at about 6 to about 8.

Furthermore  apart from the specific constituents used above the cationic fluorocarbon can be Fluoroalkane such as per fluoro Butadiene and fluorinated ethylene propylene; the fluorocarbon extender can be isophorone diiosocyanate; the anionic thickener can also be polymeric emulsion of sodium carboxy methyl cellulose; and the anionic binder can be 2 hydroxy butyl methacrylate.
In an embodiment of the present disclosure  the instant composition is a moderately viscous liquid. The viscosity of this composition is measured preferably as about 10 000 cPs at room temperature.

The constituents and their respective concentrations in the composition used in the present disclosure are defined in table 1 below:

Table 1
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon per fluoro Octanic Acid about 100 g/kg
Fluorocarbon extender hexamethylene diisocyanate about 10 g/kg
Anionic thickener sodium alginate about 10 g/kg
Anionic binder 2-hydroxy methyl methacrylate amide about 10 g/kg
Water
(about 25°C to about 30°C) about 870 g/kg

In yet another embodiment  the fabric is selected from group comprising cotton and synthetic fabric  preferably nylon  acrylic and polyester; or any combinations thereof.

EXAMPLE 2:
In another embodiment of the present disclosure  the fabric with invisible print is obtained by initially pre-treating the fabric  followed by screen printing/treating the fabric and curing the fabric. The pre-treating of the cotton fabric involves: singeing  enzyme desizing  scouring and bleaching; followed by neutralizing  mercerizing and optional dyeing. On the other hand  the pre-treating of polyester/nylon involves: heat setting  desizing  scouring and optional dyeing. Thereafter once the step of curing is completed  the fabric is optionally converted into a garment with the invisible print in it. The pre-treating steps are outlined below:

• SINGEING:
In another embodiment of the instant disclosure  singeing is the process of burning out projecting hairy fibers from the surface of the fabric by assigning the fabric through a gas flame. Both sides of the fabric are burnt out by the flame. It helps in the subsequent chemical processing of the fabric. After dyeing or printing of the singed fabric  brightness  luster and color of the fabric become better.

During the singeing process  fibers which are not tied in threads or in the cloth are burned through the action of thermal energy  normally by means of a flame. This means that a fabric surface is achieved which is free of hair and fibers.

The singeing flame passes close to the fabric with the jet direction being at a tangent to the fabric surface. Tangential singeing also equalizes protruding fibers and repairs filament breaks. In addition to the singeing position  the singeing effect is also influenced by variation of key singeing parameters; namely speed  flame intensity and distance of the fabric from the burner. As the energy content of the flame is lowered  the farther it is from the burner and hence the singeing efficiency is consequently decreased. The distance between the burner and the fabric is usually in the range of about 6 - about 8mm but it is adjusted to a range from about 6 to about 20 mm. In the present disclosure  the intensity of flame is more when compared to other fabrics applied for conventional use; specifically in the range of about 50000 to about 80000 kcal.

In the present disclosure  singeing is carried out in a singeing machine. The intensity of the flame is also adapted automatically to specific values by means of the integrated intensity adjustment mechanism.

Following are the three essential conditions for good singeing:
1. A flame with high mechanical & thermal energy to quickly burn thermoplastic protruding fibers (e.g. polyester) without any molten beads formation 
2. A homogeneous flame with uniform mechanical & thermal energy to result in uniform singeing 
3. An optimal flame/fabric contact time to neither result in incomplete nor over-singeing.

Singeing is a process to remove all the protruding fibers or pills over the surface of the fabric. This removal enhances the appearance and feel of the fabric by rendering a smooth and even surface for further processing. Singeing is purely a mechanical process with which the protruding hair like fibres is burnt with the help of gas burners. So a singeing machine is purely a mechanical device to feed the fabric continuously at a particular speed in front of a glowing flame at a particular distance. In order to avoid ignition of the fabric itself during the exposure of the same in front of the open flame  it is customary to make the fabric wet. The singing speed is speed of the fabric in machine may vary from about 75 m/min to about 150m/min.

• DESIZING:
In an embodiment of the present disclosure  the step of singeing is followed by desizing  which is the process of removing starch materials present in the fabric. Enzymes are used to degrade and remove the starch present in the fabric. If those size materials are not removed from the fabrics  the subsequent chemical treatments on the fabric are irregular  which causes defective dyeing and printing.

There are basically three type of desizing methods that are being adopted according to the fabric construction  end use purpose and the economical requirements  viz. 
1) Acid desizing 
2) Basic desizing and
3) Enzyme desizing.

The purpose of desizing is to remove the sizing ingredients such as starches  gums  PVA etc. The gums and PVA can be removed by simple hot wash. But starch has to be degraded into smaller water soluble molecules by the process of hydrolysis. The hydrolysis of starch using enzymes under particular concentration  temperature and duration is called desizing.

In another embodiment  the present process involves enzyme desizing  which is carried out by padding the required concentration of the enzyme under the required pH and allowing the enzyme to hydrolyze the starch for a required length of time. After allowing the enzyme to hydrolyse the starch for the required time  the fabric is taken for hot and cold washes followed by bleaching  mercerization etc. The route of Singe ?Desize ?scouring?Bleach ?neutralizing ?dry?Mercerize ?neutralize ?dry  is employed here.

The following parameters are considered to be very important to obtain a good desizing:
1. Type of fabric - its construction  Gram per square meter  fibre content.
2. Speed of the application machine.
3. flame height and intensity.
4. Brush position.
5. Bath Concentration  pH and temperature.
6. Mangle Expression percentage.

In another embodiment of the instant disclosure  the desizing reagents used on continuous processing machine are the following:
Enzyme Based desizing:
Enzyme = about 1 g/L
Bath temperature = about 60 to about 70°C
Common salt = about 10 g/L
pH of bath = about 5.5 to about 6.5
soaping agent= about 5 g/L
pH of fabric = about 5 to about 6
Oxalic acid = about 0.5 g/L
Acetic acid = about 1 g/L
Nip Pressure = about 2.2 kg/sq cm
Speed (meters/minute) = about 90 to about 120
Pick up = about 70 to about 75%

Alpha amylase is most commonly used enzyme for desizing.

It is important to note that the instant step is a continuous process and the fabric passes through the bath of desize chemical at a speed of about 90 to about 100 meters/minute.

• SCOURING:
In an embodiment of the present disclosure  the step of desizing is followed by scouring  which is the process of removing natural impurities present in the cotton fibre. The natural impurities are pectins  pectose  ash  wax  mineral compounds  etc. If those impurities present in the cotton fibres are not removed  it is difficult to dye or print the fabric uniformly. Normally  caustic soda ash is used as main reagent for scouring of cotton fabric.

Scouring involves the treatment of textile materials in aqueous or other solutions in order to remove natural fats  waxes  proteins and other constituents  as well as dirt  oil and other impurities.

The scouring process is responsible to clean the fabric from oil  wax  and other impurities of cotton.
To remove pectic substances and cotton wax contained in cotton woven fabrics  the use of caustic soda (NaOH) at about 3 g/L to about 5 g/L  strong alkali  is the most effective. The caustic soda has the effect of not only converting water-insoluble pectose contained in pectic substances into water-soluble pectic acid soda  but also of hydrolyzing (saponifying) cotton wax. However  a single use of the caustic soda does not provide enough penetration  emulsion  washing  and scouring powers  and so a surfactant is generally used along with it. Surfactants are compounds that lower the surface tension of a liquid  the interfacial tension between two liquids  or that between a liquid and a solid. In scouring  surfactants act as a detergent and wetting agent. The most commonly used non-ionic surfactants are alkyl sulphates  alkyl ethoxylate sulphates and fatty acids.

To reduce the hardness of water and prevent insolubilization caused by calcium and magnesium  a chelating agent is also used in scouring. Ethylene diamine and Methylamine are the most commonly used chelating agents.

Also  the method of scouring with an enzyme instead of with caustic soda is also possible. In this case  protopectinase is used for degrading pectin and enzymes like lipase etc. are used for degrading oil.

In the present disclosure  Alkali scouring is carried out using a liquor ratio of 1:20  sodium hydroxide about 4% on weight of the material  wetting agent about 1% and soaping agent about 1-2% at boiling temperature  followed by hot wash and cold wash.

• BLEACHING:
In an embodiment of the present disclosure  the step of scouring is followed by bleaching  which is the process of removing natural coloring matters present in the cotton fibre. For this purpose  hydrogen peroxide  bleaching powder or other bleaching agents are used. Hydrogen peroxide is the best and most commonly used bleaching agent. If this bleaching treatment is not carried out before dyeing or printing  the color yield and shade matching is a problem.

Bleaching is an operation to remove the coloured impurities from textile fibers. Cotton  in its natural form contains many minerals  waxes  proteins and colouring matters  etc. In order to attain a bright and water absorbent substrate for dyeing  Pre-treatment to make the fabric uniformly ready for dyeing or printing is required.

The composition used is hydrogen peroxide in about 5 to about 10 ml/L of water in the bleaching bath at about 40 to about 50°C  machine speed or the fabric speed in the machine is about 60 to about 90 mtrs/min.

After bleaching  Neutralizing with acetic acid at concentration ranging from about 0.5g/l to about 1.5g/l is required. In the present disclosure  singeing  desizing  scouring  bleaching and neutralizing are performed in one machine called pre-treatment range (PTR) machine. The machine speed for all the steps is maintained at about 60 to about 90mtrs/min  as per the requirement.

• MERCERIZATION:
In an embodiment of the present disclosure  the step of bleaching is followed by mercerization step  which is a special chemical pre-treatment on cotton fabric to improve the properties and performance of cotton fabric. In mercerization  the cotton fabric is treated under tension  in about 20% caustic soda solution.

Mercerization is one of the most important processes for finishing of cotton materials. It imparts gloss to the fibre  increases its hygroscopicity and strength and improves its dye affinity. The mercerizing process consists of treatment of cellulosic materials with concentrated solutions of caustic soda at room temperature. Mercerized cellulose is hydrated cellulose.

Under the action of concentrated alkaline solution  modification in chemical  physico-chemical and structural properties of cellulose takes place. Chemical reactions lead to the formation of alkali cellulose  physical reactions  intensive swelling of fibers and structural reactions  to result in a change in the arrangement of units in the cellulose macromolecule.

Concentrated solutions of caustic soda cause considerable swelling of cotton fiber. The changes in the physical properties of cellulose are irreversible. When the fiber swells  its volume undergoes considerable changes. At maximum water absorption  the cross section of cotton fibre is increased by about 40% to about 50% with inconsiderable increase in length (about 1% to about 2%). The size of pores in the fibrous material is considerably increased.

The main factors influencing the factors of swelling are temperature of treatment  the concentration of the alkali in the solution and additions [Continuous constant feeding of caustic is required to maintain same concentration through the process] made to the solution. Cellulose swelling in an alkaline solution increases with a drop in temperature. Alkali concentration is also of great importance for cellulose swelling. The greatest swelling of cotton cellulose is observed at alkali concentrations characterized by an appearance of an X-ray pattern of alkali cellulose.

Many properties of cotton fabric are improved by Mercerization  as mentioned below:
- Increase in absorbency power.
- Increase in fabric luster.
- Increase in fabric softness and handle property or fabric drape.
- Reduction in dye consumption.
- Reduction in chemical consumption in dyeing.

For mercerization in the present disclosure  Caustic Soda used is about 220 g/L to about 250 g/L  at concentration 180 Baume. The machine speed is maintained at about 25 to about 35 mtrs/minute. There are two types of mercerization: one is chainless roller mercerization and the other is chain mercerization. In chainless roller mercerization there is no chain stenter and in chain mercerization there is one chain stenter right after the mercerization bath by which one can stretch the width for optimum requirement. For both the types of mercerization there is length wise fixed tension due to tension/fabric guide rollers.

• Mercerization is not performed in PTR and is done in a separate machine followed by neutralizing and drying. Dyeing is done in separate machine either in Cold Pad Batch Machine or Continuous Dyeing Range Machine.
• DYEING:
Two methods of dyeing are explained below:

Cold pad Batch dyeing:
Pad Batch Dyeing is one of the widely used techniques for semi-continuous dyeing process. It is mainly used in the dyeing of cellulosic fibre like cotton or viscose (knit and woven fabric) with reactive dyes. Pad batch dyeing is a textile dyeing process that offers some unique advantages in the form of versatility  simplicity  and flexibility and a substantial reduction in capital investment for equipment. It is primarily a cold method that is the reason why it is sometimes referred to as the cold pad batch dyeing. The technique or process used in pad-batch dyeing starts with saturating the prepared fabric with pre-mixed dye liquor. Then it is passed through rollers. The rollers or padders  effectively force the dyestuff into the fabric. In the process  excess dye solution is also removed. After removal of excess dye stuff the fabric is subsequently batched. This batching is done by either storing it in rolls or in boxes. It takes a minimum of about 4 - about 12 hours.

The batches are generally enclosed by plastic films. This prevents absorption of carbon dioxide and water evaporation. Finally as the reaction is complete the fabrics are washed.

Continuous Dyeing:
Vat dyeing and Reactive dyeing are performed in this method. The dye is dissolved with a minimum amount of urea and 10 parts of resist salt per 1000 parts of liquor. The fabric is then padded cold  dried and passed through caustic soda in solution and then steamed for about 60 – about 75 seconds at about 100 – about 105oC and washed off.

In another embodiment of the present disclosure  the dyeing is carried out in machine selected from group comprising cold pad batch machine and continuous dyeing range machine for cotton; and in Jet dyeing machine for polyester  acrylic and nylon.

In yet another embodiment  the present disclosure involves fabric preparation/pre-treating of polyester/nylon which involves the steps of: heat setting  desizing  scouring  and dyeing (if required).

• HEAT SETTING OF POLYESTER AND NYLON:
In an embodiment of the present disclosure  heat setting is carried out when the fabric of the instant disclosure is polyester/nylon. Heat setting of synthetic fabrics eliminates the internal tensions within the fiber generated during manufacture and the relaxed state of the fabric can be fixed by rapid cooling. This heat setting fixes the fabrics in the relaxed state and thus avoids subsequent shrinkage or creasing of fabric. Presetting of goods makes it possible to use higher temperature for setting without considering the sublimation properties of dyes and also has a favorable effect on dyeing behavior and running properties of goods. On the other hand  post setting is combined with some other operations such as thermosol dyeing or optical brightening of polyester. Post setting as a final finish is useful to get a high dimensional stability along with desired handle.

In an embodiment of the instant disclosure  the application of heat in the heat setting process is done by hot air on a pin stenter at about 220°C for about 20 seconds to about 30 seconds for polyester goods and at a lower temperature range of about 190 °C to about 200°C for about 10 seconds to about 15 seconds for nylon. Acrylics may be heat-set partially at about 170°C to about 190° C for about 15 seconds to about 60 seconds to reduce formation of running creases. However  higher temperature is avoided to prevent yellowing.

In an embodiment of the present disclosure  the heat setting is carried out at temperature ranging from about 155°C to about 230°C  preferably from about 170°C to about 220°C; for time duration ranging from about 10 seconds to about 70 seconds  preferably 15 seconds to about 60 seconds. In another embodiment of the present disclosure  for polyester the heat setting is carried out at temperature ranging from about 210°C to about 220°C and for time duration ranging from about 20 seconds to about 30 seconds; for nylon  the heat setting is carried out at temperature ranging from about 190°C to about 200°C and for time duration of about 10 seconds to about 15 seconds; and for acrylic the heat setting is carried out at temperature ranging from about 170°C to about 190°C and for time duration ranging from about 15 seconds to about 60 seconds.

The steps of desizing  scouring  and dyeing for nylon and polyester are carried out as mentioned below. There is no need of mercerization step in polyester and nylon.
In an embodiment of the present disclosure  desizing of polyester and nylon is carried out. Poly vinyl Acetate is added at a percentage ranging from about 4% to about 6%  preferably about 5%- is used for sizing material for polyester and nylon which is water soluble. To remove the size material the following steps are followed in Jet dyeing machine.
1. Saturating with the water containing a wetting agent (for rapid penetration of water) 
2. Heating in the steamer and
3. Rinsing with hot and cold water.

In another embodiment  scouring of polyester and nylon is done to remove impurities such as electrolyte  antistatic finishing agent and spin finishes. The chemicals generally required for scouring are wetting agent at concentration ranging from about 0.1 g/l to about 1 g/l  sequestering agent at concentration ranging from about 0.5 g/l to about 1.5 g/l  detergent at concentration ranging from about 1 g/l to about 2.5 g/l and soda ash at concentration ranging from about 1.5 g/l to about 5 g/l. The entire process is carried out in jet dyeing machine and is provided below:
1. Set the substrate at room temperature with wetting agent  detergent and sequestering agent.
2. Raise the temperature to about 95 - about 100°C @ about 1-3°/min.
3. Run for about 30 min - about 60 min.
4. Cool down the temperature to about 60- about 70°C and drop.
5. Rinse twice with hot (around 60°C) and cool water.

In another embodiment  dyeing of polyester and nylon is carried out. The dyeing of polyester is done in Jet dyeing machine with disperse dyes selected from group comprising azobenzene and anthraquinone in the condition of high temperature and high pressure. Specifically  for polyester the temperature required is about 135 degree C and pressure is about 4.5 to 5 kg/cm2 and for nylon the temperature required is about 95-100 degree C and pressure is about 3-3.5 kg/cm2(2 means square). The dyeing of Nylon is done in jet dyeing machine with acid dyes selected from group comprising carboxylic organic acid and sodium salt of sulphuric acid.

• SCREEN PRINTING:
In an embodiment of the present disclosure  the pre-treated fabric of the instant disclosure obtained by the sequential steps captured in the above section is treated with the instant composition. The pre-treated fabric is subjected to screen printing treatment with the instant composition. Screen Printing consists of three elements:
- the screen which is the image carrier;
- the squeegee; and
- the ink.

The screen printing process uses a porous mesh stretched tightly over a frame made of wood or metal. Proper tension is essential for accurate color registration. The mesh is made of porous fabric or stainless steel mesh. A stencil is produced on the screen either manually or photo-chemically. The stencil defines the image to be printed.

In an embodiment of the present disclosure  screen printing aliment made of the instant composition comprising the cationic fluorocarbon  fluorocarbon extender  anionic thickener and cross linking agent/anionic binder; is applied to the substrate by placing the screen over the material. The instant prepared composition with a paint-like consistency is placed onto the top of the screen. The instant composition is then forced through the fine mesh openings using a squeegee that is drawn across the screen  applying pressure thereby forcing the composition to pass through the open areas of the screen. The composition passes through only in areas where no stencil is applied  thus forming an invisible image on the printing substrate. The diameter of the threads and the thread count of the mesh determine how much of the instant composition is deposited onto the substrates.

Many factors such as composition size and form  angle  pressure  and speed of the blade (squeegee) determine the quality of the impression made by the squeegee. In the past  most blades were made from rubber which  however  is prone to wear and edge nicks and has a tendency to warp and distort. While blades continue to be made from rubbers such as neoprene  most are now made from polyurethane  which can produce as many as 25 000 impressions without significant degradation of the image.

Screen Preparation:
In an embodiment of the present disclosure  screen (or image transfer) preparation includes a number of steps. Initially  the objects  photographs  text  ideas  or concepts to be printed are identified and obtained. The screen printer then transfers a picture of the artwork (also called copy) to be printed into an image (a picture on film) which is then processed and eventually used to prepare the screen stencil.

Once the artwork is transferred to a positive image  it is chemically processed onto the screen fabric (applying the emulsion or stencil) and eventually mounted onto a screen frame that is then attached to the printing press and production begins.

Different mesh sizes are used for different applications in the screen printing process. Mesh size is measured by how many threads of mesh there are crossing per square inch. The higher the mesh count  the finer the threads and holes are in the screen. The size of the mesh is related to how detailed an image is and the thickness of the ink being used. If an image has extremely high detail  a lower mesh screen will not hold the high detail. The fine lines or dots in the image will fall through the holes in the mesh not giving a correct representation of what the image should be. Also  if a thinner chemical paste is used  the paste will also flood through the larger holes and substrate  making the image blurry as the print chemical bleeds.

On the other hand  if a thicker chemical paste is used through too high a mesh screen  barely any print chemical will print through the mesh. If the mesh count is fairly close  such as the difference between 155 vs. 156  196 vs. 200  or 81 vs. 86  the difference is so negligible and small that it will not affect the final results.

The basic and most standard mesh sizes are 110 and 156. The 110 mesh lays a fairly thick layer of printing chemical down. It is good for block text letters and larger spot color designs. The 156 mesh also lays down a little thicker layer of screen printing chemical but it offers some higher detail ability in the image due to the finer mesh. Also  if the printing is with a thinner viscosity of chemical colors  the 156 mesh could be used so that not too much chemical is passed through the screen. The 200 and 230 mesh are used for finer detailed images. Different mesh sizes hold different amounts of emulsion  depending on how big the holes in the mesh are. For instance  a 110 mesh screen will hold much more emulsion then a 305 mesh screen. While the difference is not extreme  the exposure times will have to vary slightly for different mesh sizes. A finer mesh screen (with high mesh count) that holds less emulsion will expose faster than a lower count mesh screen that holds more emulsion. However  the difference is small so it may have to only vary as slightly as about 5 to about 10% in either direction and depending on mesh size in order to get maximum exposure performance.

The Screens used in the present disclosure are about 230 mesh  that means about 230 threads crossing/square inch. The higher the mesh count  the finer the threads and holes are in the screen. Screens are stretched pneumatically to industry standard tensions using high grade mono filament poly mesh and held using syano-acryloid glue. The mesh material used in the instant disclosure is mono filament polyester mesh.

Different methods of Screen Printing:
There are three types of screen printing presses –
- flat-bed 
- cylinder and
- rotary.

In an embodiment of the present disclosure  a rotary screen printing machine has been used. The basic operation of rotary screen printing is in-feed device  glue trough  rotating screen  dryer  and fixation equipment. As the fabric travels under the rotary screens  the screens turn with the fabric. Print paste is continuously fed to the interior of the screen through a colour bar or pipe. As the screen rotates  the squeegee device pushes print paste through the design areas of the screen onto the fabric. The figure 3 depicts a rotary screen printing.

Factors to be considered at the time of printing:
-The viscosity of the print paste: If the viscosity of the print paste is high it will pass over the screen comparatively slow.
-The no of squeeze strokes: If the number of squeeze strokes is more  the printing paste will pass slowly.
-The squeeze angle and pressure: More pressure enhances the speed of print paste.
-The speed of squeeze strokes: Higher speed of squeeze strokes means higher amount of print press to pass.

• CURING:
After treating/printing the fabric using the instant composition  the fabric is exposed to high temperature in curing machine  the temperature in curing is about 150°C to about 160°C  preferably about 155°C. The dwell time required is about 2 to about 5 minutes  preferably about 3 minutes. The curing is important to fix the fluorocarbon on fabric surface  to make it wash durable.

There are guide rollers which takes the fabric into the curing chamber  where the fabric is exposed in temperature. The machine speed and the settings of guide rollers inside the curing chamber is designed in such a way that the fabric can stay upto about 3 - about 5 minutes (dwell time). After that the fabric comes out.

Once the process of curing the treated fabric is completed and the fabric with invisible print is obtained  the fabric is then either subjected to contacting with solvent for visualizing the invisible print  or the fabric is converted to a garment and thereafter subjected to the contacting of the solvent to visualize the prints.

In another embodiment of the present disclosure  the treated fabric of the instant disclosure as obtained above is optionally stitched into a garment using standard industrial procedures to obtain a garment with invisible print.

The process of making the garment is as follows:
Design/sketch for styling?pattern design for production?marker making?laying of fabric?cutting?Bundling of different parts?Fusing for collar and cuff?sewing in sewing machine for assembling different parts to obtain the desired garment.
EXAMPLE 3:
The treated fabric/garment obtained in the example 2 is then tested for the effectiveness of the present treatment with regards to the various parameters such as garment/fabric strength in terms of tensile and tear strength; durability; oil and water repellency; and difference of appearance of the fabric/garment in the dry state and when the fabric is sprayed with solvent such as water or volatile petroleum based solvents like Acetone  percholoro ethylene and carbon tetrachloride.

• Tensile strength (Method: ASTMD 5034):
The method ASTMD 5034 is employed in the instant disclosure. The grab test procedure is applicable to the determination of the effective strength of the fabric; that is  the strength of the yarns in a specific width together with the fabric assistance from the adjacent yarns. The grab test is a tensile test where the central part of the specimen""s width is tested in the grips. It uses about 100 mm x 150 mm (at least) long specimens with a line drawn parallel to the long direction and located in from the edge of one side of the specimen. The grab test is similar with lateral slits cut into the sides of each specimen  except for the center 25 mm (specifications are different for testing of wet fabrics). In all tests  the specimen is pulled to break at about 300 mm/min (about 12 in/min). Test results are the Breaking strength (maximum load) and elongation. The standards are different for different fabric/garment  generally the industry norms is 11.4 kg (minimum) for fabric/garment made of 40’s and 50’s  wherein 40’s and 50’s denote yarn count used for making the fabric. The First value is for warp and the second value is for weft. These values are called the English count which is the number of 840 yard threads in one pound.

• Tear Strength (Method: ASTMD 1424):
The method ASTMD 1424 is employed in the instant disclosure. This test method is for determining tearing strength by the falling pendulum type apparatus used in the trade for the acceptance testing of commercial shipments of fabrics. This test method covers the determination of the force required to propagate a single-rip tear starting from a cut in a fabric and using a falling-pendulum (Elmendorf-Type) apparatus. This test method applies to most fabrics  provided that the fabric does not tear in the direction crosswise to the direction of the force application during the test. Here  the average force required to propagate tearing from a pre-cut specimen is measured using a precisely calibrated pendulum device known as the Elmendorf Tester. Acting by gravity  the pendulum swings through an arc  tearing the specimen from a pre-cut slit. The specimen is held on one side of the slit by the pendulum and on the other side by a stationary member. The loss in energy of the pendulum is indicated by a pointer reading on a scale and is a function of the force required to tear the specimen.

Specimens should be taken so as to obtain two sets of five test specimens  4 inches (10 cm) wide and 2.5 inches (6.3 cm) long. One set shall have the long dimension parallel to the machine direction and the other set shall have the long dimension parallel to the cross-machine direction. Either before or after mounting in the test apparatus a slit of 0.8 inches (2.0 cm) long is made at the center line of the wide edge and in the direction of the specimen length. This leaves 1.7 inches (4.3 cm) of tearing length between the end of the slit and the opposite edge of the specimen.

The standards are different for different fabric/garment  generally the industry norms is 685 gms (minimum) for fabric/garment made of 40’s and 50’s.

The tensile strength and tear strength of the printed fabric is tested as given above. For the testing of durability  about 50 home laundering is done and the difference of the invisible print appearance in the dry state and when fabric is sprayed with solvent is observed. The results for the fabric/garment obtained in the example 2 are given below.

Table 2
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 19.3/14
Tear strength (warp/weft) in grms
Test method-ASTMD1424 1250/950

In the instant disclosure  the fabric is 100% cotton  yarn used to make the fabric warp-40’s count/weft-40’s count  ends per inch 120 and picks per inch 68. As can be observed from above  the industrial standards are 11.4 [minimum] kgs and 685 gms [minimum] for tensile and tear strength. Hence  when the above obtained results are compared with the instant example  the values obtained in the instant example are within the industrially required limits.

For both warp and weft  the industrial standard for tensile strength is 11.4 [minimum] kgs and the tear strength is 685 gms [minimum]. However  different buyers have different norms  the above captured values are industrial standards which are majorly acceptable.

• About 50 wash of home laundering is done using printed fabric/garment to see the print durability and print functionality. After about 50 home laundering  the print is invisible in dry state but when exposed to water or petroleum based solvent such as acetone  percholoro ethylene and carbon tetrachloride  it shows same intensity of appearance when compared with the newly obtained treated fabric/garment. So  the durability point of the printed fabric/garment shows good result.

• Water repellency test (Method: AATCC22):
This test method is applicable to any textile fabric. It is especially suitable for measuring the water repellent efficiency of finishes applied to the fabrics  particularly plain woven fabric. Water sprayed against the taut surface of test specimen under controlled conditions produces a wetted pattern whose size depends on the relative repellency of the fabric. As per the standards  rating 100 is maximum and 0 is minimum.

In the instant example the values obtained are initial 100 and after 50 home laundering wash 80. Hence  it can be observed that the values obtained in the instant case are within the required standards.

• Oil repellency test (Method: AATCC-118): This test method detects the presence of fluoro chemical finish or other compounds capable of imparting a low energy surface  on all types of fabrics  by evaluating the fabric resistance to wetting by a selected series of liquid hydrocarbons of different surface tension. The oil repellency grade is the highest numbered test liquid which does not wet the fabric surface. As per industry standards  rating 8 is the highest  0 is lowest.

In the instant example the values obtained are initial 6.5 and after 50 home laundering wash 5.5. Hence  it can be observed that the values obtained in the instant case are within the required standards.

EXAMPLE 4:
A cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to treating/screen printing using the instant composition prepared as per example 1  followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg  and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg.

The treating/Screen printing of the fabric is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

Table 3
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon perfluro ethyl acrylate. 100 g/kg
Flurocarbon extender Hexamethylene diisocyanate 10 g/kg
Anionic thickener Sodium carboxy methyl cellulose 10 g/kg
Anionic binder 2-Hydroxy methyl methacrylate 10 g/kg
Water
(about 25°C to about 30°C) 870 g/kg

Furthermore  apart from the specific constituents used above the cationic fluorocarbon can also comprise of perfluoro Butadiene and perfluro ethyl acrylate; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy butyl methacrylate.

The fabric printed with the instant composition is cured to obtain the treated fabric and optionally stitched into garment using industrially known processes. The fabric/garment is tested for various parameters such as tear strength  tensile strength and durability of invisible print as per example 3. The invisible print is visible on immediate contact with solvent; and both the tear and tensile strength of the fabric/garment is considerably well above the minimum required results.

Specifically  the tensile strength and tear strength of the printed fabric/garment is tested. For durability  about 50 home laundering is done and tested. The difference of appearance in the dry state and when fabric/garment is sprayed with solvent is observed. The results are as below.

Table 4
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 17.5/12.8
Tear strength (warp/weft in grms
Test method-ASTMD1424 1220/800

• The base fabric is 100% cotton yarn  which is used to make the fabric warp-50’s count / weft-50’s count ends per inch 132 and picks per inch 80. The results are satisfactory when compared to industrial standard. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum] the instant composition treated fabric/garment shows tensile strength of 17.5/12.8 and tear strength of 1220/800. Hence  it can be observed that the values obtained for the fabric/garment treated with the instant composition are within the required standards.

• In the instant experiment  about 50 wash of home laundering is done using printed fabric/garment to see the print durability and print functionality. After about 50 home laundering the print is invisible at dry state but when exposed to water it shows the same intensity of appearance when compared with the newly obtained treated fabric/garment. So  the durability point of the printed fabric/garment shows good results.

• As per AATCC22 initial water repellency and water repellency after 50 washes is grade 100 and grade 70 respectively. As per AATCC118 initial oil repellency and oil repellency after 50 washes is grade 6.5 and 5 respectively. It can be observed that both the values are as per the industrial standards.

Based on the above example  it can be concluded that the composition of the instant disclosure shows good results and is efficient in highlighting the invisible print. The constituents captured above and their concentrations in the mentioned range are seen to bring about the best results in terms of the invisible prints on the fabric/garment.

EXAMPLE 5:
In another set of similar experiments  a cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg.

The treating/Screen printing of the fabric is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

Table 5
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Perfluorobutadiene 112 g/kg
Flurocarbon extender Isophorone diisocyanate 15 g/kg
Anionic thickener Sodium alginate 8 g/kg
Anionic binder 2-Hydroxy butyl methacrylate. 15 g/kg
Water
(about 25°C to about 30°C) 850 g/kg

Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of sodium carboxy methyl cellulose; and the anionic binder can also comprise of 2 hydroxy butyl methacrylate.
The fabric printed with the instant composition is cured to obtain the treated fabric and optionally stitched into garment using industrially known processes. The fabric/garment is tested for various parameters such as tear strength  tensile strength  wash durability  oil and water repellency of invisible print as per example 3. The invisible print is visible on immediate contact with solvent and both the tear and tensile strength of the fabric/garment is considerably well above the minimum required results.

The tensile strength and tear strength of the printed fabric/garment is tested. For durability  about 50 home laundering is done and the difference of appearance in the dry state and when fabric/garment is sprayed with solvent is observed. The results are as provided below.

Table 6
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 19/13.2
Tear strength (warp/weft) in grms
Test method-ASTMD1424 1250/830

• The base fabric is 100% cotton  yarn used to make the fabric warp-50’s count/weft-50’s count  ends per inch 144 and picks per inch 84.The results are satisfactory when compared to industrial standards. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685gms [minimum] the instant composition treated fabric/garment shows tensile strength of 19/13.2 and tear strength of 1250/830. Hence  it can be observed that the values obtained for the instant fabric/garment treated with the instant composition are within the required standards.

• Further  about 50 wash of home laundering is done using printed fabric/garment to see the print durability and print functionality. After about 50 home laundering the print is invisible at dry state but when exposed to water it shows same intensity of appearance when compared with the newly obtained treated fabric/garment. So  the durability point of the printed fabric/garment shows good result.

• The above composition gave good results in terms of oil and water repellency which is sustained even after washing. The phenomenon of invisible print is also well observed. In this case a solid pattern of 100 cm*100 cm has been printed instead of print design to check oil and water repellent property of printed fabric/garment. As per AATCC22 method  initial water repellency is grade 100 and water repellency after 50 washes is grade 80. As per the standards  rating 100 is maximum and 0 is minimum. Hence  it can be observed that the values obtained in the instant case are within the required standards.

As per AATCC118 method initial oil repellency and oil repellency after 50 washes is grade 6.5 and 5.5 respectively. The print paste used has water oil repellent fluorocarbon. Testing has been done on printed portion. This data proves that the composition of the present disclosure can sustain up to 50 washes with very good results of repellency. As per industry standards  rating 8 is the highest  0 is lowest. Hence  it can be observed that the concentration values obtained in the instant case for the composition’s constituents bring about the best results in terms of the invisible prints on the fabric/garment.
EXAMPLE 6:
In another set of similar experiments  a cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg  and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg.

The treating/Screen printing of the fabric is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

Table 7
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Perfluorooctanic acid about 90 g/kg
Flurocarbon extender Isophoronediisocyanate about 10 g/kg
Anionic thickener Sodium carboxymethylcelulose about15 g/kg
Anionic binder 2 hydroxy methyl methacrylate about 15 g/kg
Water
(about 25°C to about 30°C) about 870 g/kg

Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluoro Butadiene and perfluro ethyl acrylate; the fluorocarbon extender can also comprise of Hexamethylene diisocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy methyl methacrylate.

The fabric printed with the instant composition is cured to obtain the treated fabric and optionally stitched into garment using industrially known processes. The fabric/garment is tested for various parameters such as tear strength  tensile strength  wash durability  oil and water repellency of invisible print as per example 3. The invisible print is visible on immediate contact with solvent and both the tear and tensile strength of the fabric/garment is considerably well above the minimum required results.

Specifically  the tensile strength and tear strength of the printed fabric/garment is tested. For durability  about 50 home laundering is done and tested. The difference of appearance in the dry state and when fabric/garment is sprayed with solvent is observed. The results are as below.

Table 8
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 15.8/12.9
Tear strength (warp/weft in grms
Test method-ASTMD1424 1200/980

• The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72.The results are satisfactory when compared to industrial standards. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum] and the instant composition treated fabric/garment shows tensile strength of 15.8/12.9 and tear strength of 1200/980. Hence  it can be observed that the values obtained for the instant fabric/garment treated with the instant composition are within the required standards.

• Further  about 50 wash of home laundering is done using printed fabric/garment to see the print durability and print functionality. After about 50 home laundering the print is invisible at dry state but when exposed to water it shows same intensity of appearance when compared with the newly obtained treated fabric/garment. So  the durability point of the printed fabric/garment shows good result.

In this case also a solid pattern of 100 cm*100 cm is printed instead of print design to check oil and water repellent property of printed fabric/garment. The above composition gave good results in terms of repellency but after 50 washes it exhibited slightly less repellency. As per AATCC22 method initial water repellency and water repellency after 50 washes is grade 100 and grade 70 respectively. As per AATCC118 method initial oil repellency and oil repellency after 50 washes is grade 6.5 and 5 respectively. Hence  it can be observed that the values for oil and water repellency are within the required industrial standards. Hence  it can be observed that the concentration values obtained in the instant case for the composition’s constituents bring about the best results in terms of the invisible prints on the fabric/garment.

EXAMPLE 7:
In another set of similar experiments  a cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg  and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg.

The treating/Screen printing of the fabric is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

Table 9
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Perfluorooctanic acid about 117g/kg
Flurocarbon extender Hexamethylene diisocyanate about 13g/kg
Anionic thickener Sodium caboxy methyl cellulose about 10g/kg
Anionic binder 2-hydroxymethyl methacrylate. about 10g/kg
Water
(about 25°C to about 30°C) about 850g/kg

Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy butyl methacrylate.

The fabric printed with the instant composition is cured to obtain the treated fabric and optionally stitched into garment using industrially known processes. The fabric/garment is tested for various parameters such as tear strength  tensile strength and wash durability of invisible print as per example 3. The invisible print is visible on immediate contact with solvent and both the tear and tensile strength of the fabric/garment is considerably well above the minimum required results.

Specifically  the tensile strength and tear strength of the printed fabric/garment is tested. For durability  about 50 home laundering is done and tested. The difference of appearance in the dry state and when fabric/garment is sprayed with solvent is observed. The results are as below.

Table 10
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 15/12.5
Tear strength (warp/weft in grms
Test method-ASTMD1424 1180/970

• The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72.The results are satisfactory when compared to industrial standard. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum] the instant composition treated fabric/garment shows tensile strength of 15/12.5 and tear strength of 1180/970. Hence  it can be observed that the values obtained for the instant fabric/garment treated with the instant composition are within the required standards.

• Further  about 50 wash of home laundering is done using printed fabric/garment to see the print durability and print functionality. After about 50 home laundering the print is invisible at dry state but when exposed to water it is shows same intensity of appearance when compared with the newly obtained treated fabric/garment. So  the durability point of the printed fabric/garment shows good result.

• As per AATCC22 method initial water repellency and water repellency after 50 washes is grade 100 and grade 85 respectively. As per AATCC118 method initial oil repellency and oil repellency after 50 washes is grade 7 and 6 respectively. Hence  it can be observed that the values for oil and water repellency are within the required industrial standards. Hence  it can be observed that the concentration values obtained in the instant case for the composition’s constituents bring about the best results in terms of the invisible prints on the fabric/garment.

EXAMPLE 8:
In another set of similar experiments  the concentration of one of the components; cationic fluorocarbon is modified to determine the efficiency of the composition of the present disclosure. The constituents used in this example are depicted in the table below. A cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

In the instant synergistic composition  the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg. Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluoro Butadiene and perfluro ethyl acrylate; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy butyl methacrylate.
However  in the instant experiment  one component  specifically cationic fluorocarbon’s concentration is modified from the respective concentrations of the components of the instant composition as depicted in the below table.

Table 11
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Per fluorooctanic acid about 40 g/Kg
Flurocarbon extender Hexamethylene diisocynate about 10 g/kg
Anionic thickener Sodium carboxy methyl cellulose about 20 g/kg
Anionic binder 2-hydroxy methyl methacrylate about 20 g/kg
Water
(about 25°C to about 30°C) about 910g/kg

Once the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing  it could be optionally converted to a garment. Subsequently  either the fabric or the garment is subjected to the various tests as per example 3. In this case also a solid pattern of 100 cm*100 cm has been printed on the fabric instead of print design to check oil and water repellent property of printed fabric. As per AATCC22 method initial water repellency is grade 70 and as per AATCC118 method initial oil repellency is grade 3.

In this embodiment  the instant composition is prepared with the concentration of about 40 g/kg of cationic fluorocarbon instead of about 100 g/kg. It is observed that the water repellency and oil repellency on the printed portion is poor and the effect after pouring water is not satisfactory. Hence  it can be concluded that the most workable concentration of the cationic fluorocarbon is about 90 to about 120 g/kg in the present composition.

Further  the amount of fluorocarbon per unit area of fabric or in print is less after printing and hence the results show poor repellency. The tensile strength and tear strength of the printed fabric/garment is tested and the results are as below.

Table 12
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 15/12.8
Tear strength (warp/weft in grms
Test method-ASTMD1424 1300/1020

The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72.The results are satisfactory when compared to industrial standard. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum] the instant composition treated fabric/garment shows tensile strength of 15/12.8 and tear strength of 1300/1020.

However  after 20 home laundering wash the print visibility becomes poor as less fluorocarbon has been used in the composition. Hence  it can be derived that since one of the constituent’s concentration has been altered  the desired results are not obtained. In other words  the tensile and tear result are showing satisfactory results; but the repellency and print visibility after home laundering is showing negative result.

EXAMPLE 9:
In another set of similar experiments  the concentration of one of the component’s fluorocarbon extender is modified to determine the efficiency of the composition of the present disclosure. The constituents used in this example are depicted in the table below. A cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

In the instant synergistic composition  the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg. Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluoro Butadiene and perfluro ethyl acrylate; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy butyl methacrylate.

However  in the instant experiment  one component  specifically fluorocarbon extender’s concentration is modified from the respective concentrations of the components of the instant composition as depicted in the below table.

Table 13
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Per fluorooctanic acid about 100 g/kg
Flurocarbon extender Hexamethylene diisocynate about 1 g/kg
Anionic thickener Sodium carboxy methyl cellulose about 10 g/kg
Anionic binder 2-hydroxy methyl methacrylate about 10 g/kg
Water
(about 25°C to about 30°C) about 879 g/kg

Once the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing  it could be optionally converted to a garment. Subsequently  it is subjected to the various tests as per example 3. In this example  the composition is prepared with about 1 g/kg of fluorocarbon extender instead of about 10 g/kg. The initial result of repellency is ok but the repellency becomes very poor after about 10 washes. Fluorocarbon extender’s function is to bind the fluorocarbon and fibre surface; it also improves the water repellency. Hence  when very little amount of fluorocarbon extender is present  the above mentioned two factors are affected adversely and are responsible for showing poor repellency. Hence  it can be concluded that the most workable concentration of the fluorocarbon extender is about 8 to about 15 g/kg in the present composition. The tensile strength and tear strength of the printed fabric/garment is tested and the results are as provided below.

Table 14
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 13/11.9
Tear strength (warp/weft in grms
Test method-ASTMD1424 1150/970

The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72.The results are satisfactory when compared to industrial standard. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum] the instant composition treated fabric/garment shows tensile strength of 13/11.9 and tear strength of 1150/970. Hence  the tear and tensile strength are not much affected by fluorocarbon extender’s concentration. But  due to less use of fluorocarbon extender in the concentration  the water repellency becomes poor after few repeated home laundering. Hence  it can be concluded that the most workable concentration of the fluorocarbon extender is about 8 to about 15 g/kg in the present composition.

EXAMPLE 10:
In another set of similar experiments  the concentration of one of the components cationic fluorocarbon is modified to determine the efficiency of the composition of the present disclosure. The constituents used in this example are depicted in the table below. A cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

In the instant synergistic composition  the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg. Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluoro Butadiene and perfluro ethyl acrylate; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy butyl methacrylate.

However  in the instant experiment  one component  specifically cationic fluorocarbon’s concentration is modified from the respective concentrations of the components of the instant composition as depicted in the below table.

Table 15
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Perfluorooctanic acid about 200 g/kg
Flurocarbon extender Hexamethylene diisocyanate about 10 g/kg
Anionic thickener Sodium carboxy methyl cellulose about 10 g/kg
Anionic binder 2-hydroxy methyl methacrylate about 10 g/kg
Water
(about 25°C to about 30°C) about 770 g/kg

Once the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing  it could be optionally converted to a garment. Subsequently  it is subjected to the various tests as per example 3. In another embodiment  the composition is prepared with about 200 g/kg of cationic fluorocarbon instead of about 100 g/kg. The water and oil repellency is ok but hand feel becomes more crispy and harsh. Moreover  it is expensive. Further  Fluorocarbon when applied on fabric  makes thin film on the fabric’s surface. Hence  more application of fluorocarbon on fabric  means the thin film becomes thick and flexibility of fabric is lessened  and it becomes more crispy in nature. Hence  it can be concluded that the most workable concentration of the cationic fluorocarbon is about 90 to about 120 g/kg in the present composition. The tensile strength and tear strength of the printed fabric/garment is tested and the results are as below.

Table 16:
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 14.5/12
Tear strength (warp/weft in grms
Test method-ASTMD1424 850/640

The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72. The industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum]  the instant composition treated fabric/garment shows tensile strength of 14.5/12 and tear strength of 850/640. Hence  it can be observed that the values obtained for the instant fabric/garment treated with the instant composition are within the required standards of tensile strength but there is a considerable drop in tear strength because the fabric becomes stiff due to high amount of fluorocarbon used. Further  the results are not satisfactory in nature  since the weft tear is less and handfeel is very crispy  flexibility of the fabric is also seen to be less. Hence  the cationic fluorocarbon’s concentration ranging from about 90g/kg to about 120g/kg gives the best results to obtain a fabric/garment with hidden prints.

EXAMPLE 11:
In another set of similar experiments  the component anionic binder is deleted to determine the efficiency of the composition of the present disclosure. The constituents used in this example are depicted in the below table. A cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

In the instant synergistic composition  the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg. Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender can also comprise of Hexamethylene diisocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy methyl methacrylate. However  in the instant experiment  one component  specifically anionic binder is removed or deleted from the instant composition as depicted in the below table.

Table 17
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon perfluorobutadiene about 100 g/kg
Flurocarbon extender Isophoronediisocyanate about 10 g/kg
Anionic thickener Sodium alginate about 10 g/kg
Anionic binder 2 hydroxy butyl methacrylate. about 0 g/kg
Water
(about 25°C to about 30°C) about 880 g/kg

Once the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing  it could be optionally converted to a garment. Subsequently  it is subjected to the various tests as per example 3. In the instant experiment  one of the components of the composition  specifically the anionic binder is completely removed or deleted from the composition. However  the initial repellency of both oil and water is observed to be very well. Further  wash durability is observed to be very poor because there is no major binding factor between fabric/garment and the chemical  due to the absence of anionic binder. Further  after 5 washes itself the effectiveness of repellency is found to be unsatisfactory in nature. The tensile strength and tear strength of the printed fabric/garment is tested and the results are as below.

Table 18
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 15/12.8
Tear strength (warp/weft) in grms
Test method-ASTMD1424 1010/850

The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72.The results are satisfactory when compared to industrial standard. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum]  the instant composition treated fabric/garment shows tensile strength of 15/12.8 and tear strength of 1010/850. Hence  it can be observed that the values for tensile and tear strength  obtained for the instant fabric/garment treated with the instant composition are within the required standards. But  wash durability test shows poor results. Hence  it can be observed that the deletion of one of the components of the instant composition does not give the same desired result as the complete composition and the instant composition is synergistic in nature.

EXAMPLE 12:
In another set of similar experiments  the component anionic thickener is deleted to determine the efficiency of the composition of the present disclosure. The constituents used in this example are depicted in the below table. A cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

In the instant synergistic composition  the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg. Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluoro Butadiene and perfluro ethyl acrylate; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy methyl methacrylate. However  in the instant experiment  one component  specifically anionic thickener is removed or deleted from the instant composition as depicted in the below table.

Table 19
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Per fuorooctanic acid about 100 g/kg
Flurocarbon extender Hexamethylene diisocyanate about 10 g/kg
Anionic thickener Sodium carboxy methyl cellulose 0 g/kg
Anionic binder 2-hydroxymethyl methacrylate about 10 g/kg
Water
(about 25°C to about 30°C) about 880 g/kg

Once the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing  it could be optionally converted to a garment. Subsequently  it is subjected to the various tests as per example 3. In the instant experiment  one of the components of the instant composition is deleted; specifically anionic thickener is completely removed. When the various tests are carried out on the fabric/garment  it is observed that without anionic thickener the viscosity of the print paste is very less and printing clarity/sharpness is not there. Thickener helps in making the instant components into a paste to obtain the instant composition  which is one of the most important aspects for printing. Hence  without the thicker  the viscosity of the composition is very less and the instant composition is watery in nature. Further  the instant composition spreads on the fabric while printing and hence cannot impart any shape/print as per the requirement.
In this case also a solid pattern of 100 cm*100 cm has been printed on the fabric instead of print design to check oil and water repellent property of printed fabric. As per AATCC22 method initial water repellency is grade 100 and as per AATCC118 method initial oil repellency is grade 6.5. The tensile strength and tear strength of the printed fabric/garment is tested and the results are as below.

Table 20
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 15.2/13.4
Tear strength (warp/weft) in grms
Test method-ASTMD1424 1300/1100

The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72. The results are satisfactory when compared to industrial standard. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum]; the instant composition treated fabric/garment shows tensile strength of 15.2/13.4 and tear strength of 1300/1100. The wash durability is found ok but the print sharpness is not there and the composition spreads on the fabric surface.

Hence  it can be observed that the deletion of one of the components of the instant composition does not give the same desired result as the complete composition and the instant composition is synergistic in nature.

EXAMPLE 13:
In another set of similar experiments  the component cationic fluorocarbon is deleted to determine the efficiency of the composition of the present disclosure. The constituents used in this example are depicted in the below table. A cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric [or the garment] is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

In the instant synergistic composition  the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg. Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluoro Butadiene and perfluro ethyl acrylate; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy butyl methacrylate. However  in the instant experiment  one component  specifically cationic fluorocarbon is removed or deleted from the instant composition as depicted in the below table.

Table 21
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Per fuorooctanic acid 0 g/kg
Flurocarbon extender Hexamethylene diisocyanate about 10 g/kg
Anionic thickener Sodium carboxy methyl cellulose about 20 g/kg
Anionic binder 2-hydroxymethyl methacrylate about 10 g/kg
Water
(about 25°C to about 30°C) about 960 g/kg

Once the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing  it could be optionally converted to a garment. Subsequently  it is subjected to the various tests as per example 3. In the instant experiment  one of the components of the instant composition is deleted; specifically cationic fluorocarbon is completely removed. When the various tests are carried out on the fabric/garment it is observed that there is very poor oil and water repellency in the print portion of the fabric/garment. Hence  the objective of the present disclosure is not fulfilled. The fluorocarbon imparts oil and water repellency by making a thin film over the fabric in the treated area. In absence of fluorocarbon  the film cannot be made and shows very poor or no repellency on the treated area. Hence  the intention of the present disclosure to obtain invisible prints is not fulfilled.

In this case also a solid pattern of 100 cm*100 cm has been printed on the fabric instead of print design to check oil and water repellent property of printed fabric. As per AATCC22 method initial water repellency is grade 30 and as per AATCC118 method initial oil repellency is grade 1. The tensile strength and tear strength of the printed fabric/garment is tested and the results are as below.

Table 22
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 15.1/12.5
Tear strength (warp/weft in grms
Test method-ASTMD1424 1400/1200

The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72.The results are satisfactory when compared to industrial standard. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum] the instant composition treated fabric/garment shows tensile strength of 15.1/12.5 and tear strength of 1400/1200. Further  after exposure in water the print appearance results found unsatisfactory. In other words  the intention of the instant disclosure to obtain invisible prints on the fabric/garment is not fulfilled.

It can be observed that the deletion of one of the components of the instant composition does not give the same desired result as the complete composition and the instant composition is synergistic in nature.

EXAMPLE 14:
In another set of similar experiments  the component fluorocarbon extender is deleted to determine the efficiency of the composition of the present disclosure. The constituents used in this example are depicted in the below table. A cotton/cellulosic fabric is taken and subjected to the instant pre-treatment comprising steps of Singeing  Desizing  Scouring  Bleaching  Neutralisation  Mercerization  Heat Setting and optional dyeing to obtain the pre-treated fabric. Alternatively  a polyester/nylon fabric is taken and subjected to instant pre-treatment steps involving steps of heat setting  desizing  scouring and optionally dyeing if required (or printing can be done on white base). Thereafter  the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing. The pre-treatment steps are followed as per the example 2.

The treating/Screen printing of the fabric is carried out by using the instant composition  wherein the constituents and their relative concentrations used are represented in the Table below. The instant composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs and the composition is maintained at pH ranging from about 6 to about 8  preferably about 7.

In the instant synergistic composition  the concentration of the cationic fluorocarbon is about 90 to about 120 g/kg  fluorocarbon extender is at concentration of about 8 to about 15 g/kg  anionic thickener is at concentration of about 8 to about 15 g/kg and anionic binder is at concentration of about 8 to about 15 g/kg. The water is in the range of about 850 to about 870g/kg. Furthermore  apart from the specific constituents used in the below table the cationic fluorocarbon can also comprise of perfluoro Butadiene and perfluro ethyl acrylate; the fluorocarbon extender can also comprise of isophorone diiosocyanate; the anionic thickener can also comprise of polymeric emulsion of Sodium Alginate; and the anionic binder can also comprise of 2 hydroxy butyl methacrylate. However  in the instant experiment  one component  specifically fluorocarbon extender is removed or deleted from the instant composition as depicted in the below table.

Table 23
CONSTITUENTS CHEMICAL NAME CONCENTRATION
Cationic fluorocarbon Per fuorooctanic acid about 100 g/kg
Flurocarbon extender Hexamethylene diisocyanate 0 g/kg
Anionic thickener Sodium carboxy methyl cellulose about 15 g/kg
Anionic binder 2-hydroxymethyl methacrylate about 15 g/kg
Water
(about 25°C to about 30°C) about 870 g/kg

Once the pre-treated fabric is subjected to screen printing using the instant composition followed by the step of curing  it could be optionally converted to a garment. Subsequently  it is subjected to the various tests as per example 3. In the instant experiment  as stated above  one of the components of the instant composition is deleted; specifically fluorocarbon extender is completely removed. When the various tests are carried out on the fabric/garment it is observed that the initial oil and water repellency is good. However  after about 15 home laundering washes the repellency and the clarity of prints become very poor. This is observed due to the absence of fluorocarbon extender in the composition. Fluorocarbon extender’s function is to bind the fluorocarbon and fibre surface. Further  it also improves the water repellency. However  in absence of fluorocarbon extender  the above mentioned two factors are affected adversely and are responsible for showing poor repellency after repeated home laundering.

In this case also a solid pattern of 100 cm*100 cm has been printed on the fabric instead of print design to check oil and water repellent property of printed fabric. As per AATCC22 method initial water repellency is grade 100 and after 15 wash water repellency grade was 40 and as per AATCC118 method initial oil repellency is grade 6.5 after 15 wash oil repellency grade is 6. The tensile strength and tear strength of the printed fabric/garment is tested and the results are as below.

Table 24
Parameter Printed fabric
Tensile strength (warp/weft) in kgs
Test method-ASTMD5034 14.9/12.4
Tear strength (warp/weft in grms
Test method-ASTMD1424 1250/970

The base fabric is 100% cotton  yarn count 40’s count /40’s count  ends per inch 124 and picks per inch 72.The results are satisfactory when compared to industrial standard. In other words  the industrial standards for tensile strength and tear strength are 11.4 kgs [minimum] and 685 gms [minimum] the instant composition treated fabric/garment shows tensile strength of 14.9/12.4 and tear strength of 1250/970. After 15 home laundering wash the print visibility becomes poor as less fluorocarbon extender has been used. Hence  the tensile and tear strength results are not affected much in absence of fluorocarbon extender  but the water repellency is poor after few repeated home laundering which causes poor visibility of print area after few home laundering.

Hence  it can be observed that the deletion of one of the components of the instant composition does not give the same desired result as the complete composition and the instant composition is synergistic in nature.

• In another embodiment of the instant disclosure  the Applications/Uses of the invisible print fabric of the present disclosure is in:
-Beach wear.
-Rain coat.
-Rain shoes.
-Umbrella.
-Sports wear.
-Swim wear.
We claim:
1. A synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder.

2. The composition as claimed in claim 1  wherein the cationic fluorocarbon is Fluoroalkane selected from group comprising perfluoro Butadiene  perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender is aliphatic polyurethane selected from group comprising Hexamethylene diisocyanate and isophorone diiosocyanate; the anionic thickener is selected from group comprising polymeric emulsion of sodium carboxy methyl cellulose and polymeric emulsion of Sodium Alginate; and the anionic binder is self linking Acrylic based co-polymer selected from group comprising 2 hydroxy methyl methacrylate and 2 hydroxy butyl methacrylate.

3. The composition as claimed in claim 1  wherein the cationic fluorocarbon has concentration ranging from about 90g/kg to about 120g/kg  preferably about 100g/L; the fluorocarbon extender has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; the anionic thickener has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; and the anionic binder has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg.

4. The composition as claimed in claim 1  wherein the composition’s viscosity at room temperature ranges from about 9000 cPs to about 11000 cPs.

5. The composition as claimed in claim 1  wherein the composition is maintained at pH ranging from about 6 to about 8  preferably about 7; and the composition is formulated into paste form with water.

6. A method to obtain synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder  said method comprising act of combining the cationic fluorocarbon  the fluorocarbon extender  the anionic thickener and the anionic binder in water to obtain the synergistic composition.
7. The method as claimed in claim 6  wherein the cationic fluorocarbon is Fluoroalkane selected from group comprising perfluoro Butadiene  perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender is aliphatic polyurethane selected from group comprising Hexamethylene diisocyanate and isophorone diiosocyanate; the anionic thickener is selected from group comprising polymeric emulsion of sodium carboxy methyl cellulose and polymeric emulsion of Sodium Alginate; and the anionic binder is self linking Acrylic based co-polymer selected from group comprising 2 hydroxy methyl methacrylate and 2 hydroxy butyl methacrylate.

8. The method as claimed in claim 6  wherein the cationic fluorocarbon has concentration ranging from about 90g/kg to about 120g/kg  preferably about 100g/L; the fluorocarbon extender has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; the anionic thickener has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; and the anionic binder has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg.

9. The method as claimed in claim 6  wherein the composition is maintained at pH ranging from about 6 to about 8  preferably about 7; and the composition is formulated into paste form withwater.

10. A method for obtaining fabric with invisible print  wherein the print on the fabric is visible upon contact with solvent  said method comprising acts of:
a. treating a pre-treated fabric with synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder; and
b. curing the treated fabric to obtain the fabric with invisible print and optionally contacting the print with solvent for visualizing the print.

11. The method as claimed in claim 10  wherein the fabric is pre-treated in pre-treatment range machine and comprise acts selected from group of singeing  desizing  scouring  bleaching  neutralizing  mercerising  heat setting and dyeing or any combinations thereof.

12. The method as claimed in claim 11  wherein the singeing is carried out at speed ranging from about 75 m/min to about 150m/min  distance between burner and the fabric ranging from about 6 mm to about 20 mm and intensity of flame ranging from about 50 000 kcal to about 80000 kcal; the desizing is enzyme desizing by Alpha Amylase at concentration ranging from about 0.5g/L to about 2g/L; the scouring is carried out using component selected from group comprising Caustic Soda  surfactant  chelating agent  sequestering agent  detergent and soda ash or any combinations thereof; and the bleaching is carried out by Hydrogen Peroxide in water at concentration ranging from about 5 ml/L to about 10 ml/L of water.

13. The method as claimed in claim 11  wherein the neutralizing is carried out using acetic acid at concentration ranging from about 0.5g/l to about 1.5g/l; and the mercerising is carried out using caustic soda at concentration ranging from about 220 g/L to about 250 g/L.

14. The method as claimed in claim 11  wherein the heat setting is carried out at temperature ranging from about 155°C to about 230°C for time duration ranging from about 10 seconds to about 70 seconds; and the dyeing is carried out in machine selected from group comprising cold pad batch machine  continuous dyeing range machine and Jet dyeing machine.

15. The method as claimed in claim 12  wherein the caustic soda is at concentration ranging from about 3g/L to about 5g/L; the surfactants are selected from group comprising alkyl sulphates  alkyl ethoxylate sulphates and fatty acids and are at concentration ranging from about 0.5g/L to about 1.5g/L; the chelating agents are selected from group comprising ethylene diamine and methylamine and are at concentration ranging from about 0.3g/L to about 2 g/L; the sequestering agent are selected from group comprising Ethylenediaminetetraacetic acid  Ethylenediamine-N N""-disuccinic acid and S  S’-ethylenediamine disuccinic acid and are at concentration ranging from about 0.5 g/l to about 1.5 g/l; the detergent are selected from group comprising Alkyl benzine sulphonate  polyoxyethyline and octyl-thioglucoside and are at concentration ranging from about 1 g/l to about 2.5 g/l; and the soda ash is at concentration ranging from about 1.5 g/l to about 5 g/l.

16. The method as claimed in claim 10  wherein the treating is screen printing; and the curing is carried out at temperature ranging from about 150°C to about 160°C  preferably about 155°C  for time duration ranging from about 2 minutes to about 5 minutes  preferably about 3 minutes.

17. The method as claimed in claim 10  wherein the solvent is selected from group comprising water  oil and petroleum based solvent including acetone or percholoro ethylene or carbon tetrachloride; or any combinations thereof.

18. The method as claimed in claim 10  wherein the cationic fluorocarbon is Fluoroalkane selected from group comprising perfluoro Butadiene  perfluro ethyl acrylate and Perfluoro octanoic acid; the fluorocarbon extender is aliphatic polyurethane selected from group comprising Hexamethylene diisocyanate and isophorone diiosocyanate; the anionic thickener is selected from group comprising polymeric emulsion of sodium carboxy methyl cellulose and polymeric emulsion of Sodium Alginate; and the anionic binder is self linking Acrylic based co-polymer selected from group comprising 2 hydroxy methyl methacrylate and 2 hydroxy butyl methacrylate.

19. The method as claimed in claim 10  wherein the cationic fluorocarbon has concentration ranging from about 90g/kg to about 120g/kg  preferably about 100g/L; the fluorocarbon extender has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; the anionic thickener has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg; and the anionic binder has concentration ranging from about 8g/kg to about 15g/kg  preferably about 10g/kg.

20. The method as claimed in claim 10  wherein the composition is maintained at pH ranging from about 6 to about 8  preferably about 7; and the composition is formulated into paste form with water.

21. A fabric or garment with invisible print  wherein the print on the fabric or the garment is optionally visible upon contact with solvent  said print is obtained by treating the fabric with synergistic composition of claim 1.

22. The method as claimed in claim 10 and the fabric as claimed in claim 21  wherein the fabric is selected from group comprising cotton and synthetic fabric  preferably nylon  acrylic and polyester; or any combinations thereof.

23. The fabric as claimed in claim 21  wherein the print is water and oil repellent; and the solvent is selected from group comprising water  oil and petroleum based solvent including acetone or percholoro ethylene or carbon tetrachloride; or any combinations thereof.

24. A kit for obtaining fabric or garment with invisible print  said kit comprising synergistic composition comprising cationic fluorocarbon  fluorocarbon extender  anionic thickener and anionic binder; and instruction manual.