FIELD OF THE INVENTION:
The present invention relates to a novel polyurethane-based ink composition for improved compatibility and adhesion to ultra-violet / Light emitting diode (UV/LED) top-coat particularly on paper, metallised paper and foil papers.
BACKGROUND OF THE INVENTION:
The adhesion of UV/LED topcoat on conventional Polyurethane or nitrocellulose or PVC based inks is not satisfactory, which easily gets removed by adhesive tapes, so the printer does not achieve optimum press speed and hence the productivity gets reduced. On the top, due to low adhesion, other adverse effects like blocking, low gloss are observed.
Therefore, a novel polyurethane based ink composition is provided for improved compatibility and adhesion between the novel polyurethane based ink composition and the UV/LED top-coat.
WO0000558A1 discloses solvent-based primer compositions which improve the adhesion of paint to polyolefin surfaces. The primer compositions can be formulated to exhibit better adhesion for both urethane and melamine topcoats.
US6713588B2 discloses a golf ball coating, where the combination of the epoxy coating film as a primer coat and the polyurethane clear coating film as a topcoat can exhibit more improved adhesion if the polyurethane clear coating film comprises a mixture of a polyester polyol and a polyether polyol as the polyol component
WO2011065433A1 discloses a polysiloxane-modified polyhydroxy polyurethane resin which is derived from a reaction between a five-membered cyclic carbonate compound and an amine-modified polysiloxane compound, and a thermoplastic polyolefin resin skin material.
OBJECTS OF THE INVENTION:
The principal objective of the present invention is to provide a novel polyurethane-based ink composition is provided for improved compatibility and adhesion between

the novel polyurethane based ink composition and the ultra-violet / Light emitting diode (UV/LED) top-coat particularly on paper, metallised paper and foil papers.
Another objective of the present invention is to improve blocking resistance properties of the UV/LED layer.
A further objective of the present invention is better adhesion towards hot-stamping hologram which is applied between the ink layer and the UV/LED top-coat layer.
Other objectives, features and advantages will become apparent to those skilled in the art from the detailed description and the appended claims.
SUMMARY OF THE INVENTION:
The present invention relates to a novel polyurethane-based ink composition for improved compatibility and adhesion to UV/LED top-coat.
The polyurethane of the present invention is manufactured in such a way that the total polyol content is in the range of 20-25%. Out of this polyol content, polyester polyol of molecular weight 4000 is in the range of 45-50%, polyester polyol of molecular weight 2000 is in the range of 40-45% and the remaining polyol is polyether polyol present in the range of 10-15%. The isocyanate content of said composition is chosen in such a way that the isocyanate to hydroxyl (—NCO / —OH) ratio is in the range of 2 to 2.3. A tin-free catalyst is used within the range of 0.001 to 0.003%.
Amines are added in such a way that the viscosity of the polyurethane does not increase beyond 16 poise at 25°C (using Brookfield viscometer). The solvent is aromatic or aliphatic or a combination thereof. The preferred adipate polyester polyols are the reaction products of adipic acid and the diols such as methyl pentane diol (MPD), neo pentyl glycol (NPG), hexane diol (HD), butane diol (BD), 1,2 propane diol (1,2-PDO), mono-ethylene glycol (MEG), diethylene glycol (DEG) etc.
The polyurethane may use chain extenders such as amines and/or short-chain diols.

The short chain diols are selected from methyl propane diol, methyl pentane diol, neo pentyl glycol, hexane diol, 1,2 propane diol, mono-ethylene glycol, diethylene glycol, butane diol etc. The preferred polyether polyols are selected from polypropylene glycol or polytetrahydrofuran (polyTHF).
The amines used as chain extender may be Isophorone diamine, aminoethyl ethanol amine, Ethylene diamine, Monoethanolamine, Diethylamine, Diethanol amine, Trimethyl hexamethylene diamine, diethylene triamine or a combination thereof. Preferably amines used are aminoethyl ethanol amine & trimethyl hexamethylene diamine. The weight percentage of amine used is 5 to 10%.
The isocyanate used in the polyurethane formulation of the present invention may be selected from aromatic, cycloaliphatic and/ or aliphatic isocyanates. Preferably, a cycloaliphatic isocyanate such as Isophorone diisocyanate (IPDI) is used.
The ink composition contains Nitrocellulose Varnish in Ethyl acetate (using 30% Isopropanol damped LX3/5 Nitrocellulose) in the range of 20- 50% by weight, more preferably 25- 45% by weight and most preferably 30 to 40% by weight.
DETAILED DESCRIPTION OF THE INVENTION:
The preferred embodiments of the present invention will be described in detail with the following disclosure and examples. The foregoing general description and the following detailed description are provided to illustrate only some embodiments of the present invention and not to limit the scope of the present invention. The invention is capable of other embodiments and can be carried out or practiced in various other ways.
Unless otherwise specified, all the technical and scientific terms used herein have the same meaning as is generally understood by a person skilled in the art pertaining to the present invention. All the patents published patent applications referred to throughout the entire disclosure herein, unless specified otherwise, are incorporated by reference in their entirety.

Definitions of terms used in this specification:
The term "polyurethane", "PU", "urethane polymer", as used herein refers to a thermoplastic polymer which can be made crosslinkable (or thermosettable) and which is produced by the reaction of a polyisocyanate (i.e., an organic compound containing at least two isocyanate (-N=C=0) groups per molecule) and a polyol. The polymeric reaction product contains repeating urethane linkages (or carbamate ester linkages) of the structure:
H O
I II -N^C—O—
When such linkages are present in a polymer, it is classified as polyurethane herein.
Polyisocyanates also react with amines (that is, compounds which contain at least one primary or secondary amino
-NH2 or -NH I
R1
group per molecule (where Ri is typically an alkyl, aryl, or like hydrocarbonaceous radical) in a similar fashion to produce a polymeric reaction product that contains urea linkages:
H O H I II I
-N-C—N —
Polymers containing both urethane and urea linkages are known as polyurethane ureas and such polyurethane polymers can be used as starting polymers in the practice of this invention.
Either the starting polyisocyanate or the starting polyol can itself have an internal polymeric structure. Examples of suitable structures include polyethers, polyesters, polyalkyls, polydimethylsiloxanes, and the like. Commonly used isocyanates in polyurethane synthesis include toluene dissocyanate (TDI) and methylene bis (p-phenyl isocyanate) or 4,4'-dimethylmethane diisocyanate (MDI) although many other isocyanates are available. Commonly used polyols include polyester and polyethers.

A polyurethane polymer can contain various functional (i.e., reactive) groups, such as one or more groups selected from the class consisting of isocyanato, hydroxyl and amino (particularly primary or secondary amino). Such functional groups are characteristically associated with polyurethane polymers. However, in addition to, or apart from, such functional groups, a polyurethane polymer can also contain other functional groups such as carboxyl groups, sulfonic acid groups, and the like, as those skilled in the art will appreciate.
A chemical compound with two or more hydroxyl (-OH) groups is known as a "polyol" in this disclosure. A polyol with exactly two -OH groups is a "diol". Similarly a polyol with just three -OH groups is a "triol".
A chemical compound that comprises at least two ester (R-CO-OR) linkages in the same linear chain of atoms is known in this disclosure as a "polyester". A chemical compound that includes both multiple ester linkages and multiple -OH functional groups is known in the present disclosure as a "polyester polyol".
A chemical compound that comprises at least two ether (R-O-R) linkages in the same linear chain of atoms is known in this disclosure as a "polyether". A chemical compound that includes both multiple ether linkages and multiple -OH functional groups is known in the present disclosure as a "polyether polyol".
Polyurethane Composition
The present invention relates to a novel polyurethane based ink composition for improved compatibility and adhesion to ultra-violet / Light emitting diode (UV/LED) top-coat.
The polyurethane based ink composition exhibits excellent adhesive properties to various substrates like paper, metallised paper, foil paper and plastic substrates such as Polyethylene terephthalate (PET) and Oriented Polypropylene (OPP).
The polyester polyol used to prepare the polyurethane composition of the present invention is prepared from a diol preferably selected from methyl pentane diol (MPD) (from Kuraray Japan), Neopentyl Glycol (from Kuraray Japan), Methyl propane diol and Adipic acid (from RHODIA).

The polyurethane of the present invention comprising polyol units and polyisocyanate units is manufactured in such a way that the total polyol content is in the range of 20-25%. Out of this polyol content, polyester polyol of molecular weight 4000 is in the range of 45-50%, polyester polyol of molecular weight 2000 is in the range of 40-45% and the remaining polyol is polyether polyol present in the range of 10-15%.. The isocyanate content of the said polyurethane is chosen in such a way that the isocyanate to hydroxyl (—NCO / —OH) ratio is in the range of 2 to 2.3.
A tin-free catalyst is used within the range of 0.001 to 0.003%.
Amines are added in such a way that the viscosity of the polyurethane does not increase beyond 16 poise at 25°C (using Brookfield viscometer). The solvent is aromatic or aliphatic or a combination thereof. The preferred adipate polyester polyols are the reaction products of adipic acid and the diols such as methyl pentane diol (MPD), neo pentyl glycol (NPG), hexane diol (HD), butane diol (BD), 1,2 propane diol (1,2-PDO), mono-ethylene glycol (MEG), diethylene glycol (DEG) etc.
Chain extenders such as amines and/or short-chain diols may be used in the polyurethane synthesis.
The amines used as chain extender may be Isophorone diamine, aminoethyl ethanol amine, Ethylene diamine, Monoethanolamine, Diethylamine, Diethanol amine, Trimethyl hexamethylene diamine, diethylene triamine or a combination thereof. Preferably amines used are aminoethyl ethanol amine & trimethyl hexamethylene diamine. The weight percentage of amine used is 5 to 10%.
The short chain diols are selected from methyl propane diol, methyl pentane diol, neo pentyl glycol, hexane diol, 1,2 propane diol, mono-ethylene glycol, diethylene glycol, butane diol etc. The preferred polyether polyols are selected from polypropylene glycol or polytetrahydrofuran (polyTHF).
The isocyanate used in the polyurethane formulation of the present invention may be selected from aromatic, cycloaliphatic and/ or aliphatic isocyanates. Mixtures of these compounds may also be used.

Examples of suitable diisocyanates include cyclohexane-1,3-diisocyanate;
cyclohexane-1,4-diisocyanate; 1 -isocyanato-3-isocyanatomethyl-3,5,5-trimethyl-
cyclohexane (isophorone diisocyanate or IPDI); bis-(4-isocyanatocyclohexyl)-
methane; 1,3-bis-(isocyanatomethyl)-cyclohexane; 1,4-bis-(isocyanatomethyl)-
cyclohexane; 1-isocyanato-2-isocyanatomethyl cyclopentane; 2,4'-diisocyanato-
dicyclohexyl methane; bis-(4-isocyanato-3-methyl-cyclohexyl)-methane,
alpha, alpha, alpha', alpha'-tetramethyl-1,3-xylylene diisocyanate;
alpha, alpha, alpha', alpha'-tetramethyl-1,4-xylylene diisocyanate; 1 -isocyanato-1 -methyl-4(3)-isocyanatomethyl cyclohexane; 2,4-hexahydrotoluylene diisocyanate; 2,6-hexahydrotoluylene diisocyanate.
The preferred is a prepolymer that has isocyanates bound to a cycloaliphatic or aliphatic moieties, more preferably, isophorone diisocyanate (IPDI) is used.
Method of preparation of polyester Povols
The calculated amount of diol (as shown in Examples 1a to 1f, tables 1 and 2) was introduced into a 1 litter reaction kettle with condenser, stirrer, thermometer, and nitrogen gas inlet tube. Provision to take out condensation water as by-product has also been provided in the reactor assembly. The required amount of adipic acid (as shown in Examples 1a to 1f, tables 1 and 2) was then introduced and the mixture was allowed to react by heating. When the internal temperature was between 140 to 160 degree Centigrade, water was distilled out and the temperature was gradually increased to 200 degree centigrade until the distilled out water had slowed down. When the acid value of the reaction mixture was slowed down to 5-10, then 0.01% of tetra-butyl titanate was added. The reaction was continued until the acid value dropped down to 2. Then vacuum was applied to keep the desired hydroxyl value as shown in the tables 1 and 2.
Method of preparation of Polvurethane
The calculated amount of diisocyanate (as shown in Examples 2a to 2f, tables 3-8) was introduced into a 1 litter reaction kettle with condenser, stirrer, thermometer, and nitrogen gas inlet tube. When the temperature reached 60°C, the required amount of polyester polyol and polyether polyols (as shown in Examples 2a to 2f, tables 3-8) have been added to the reactor. After the addition, the reactor temperature was kept in between 100°C until the desired isocyanate content has been achieved. Then the

prepolymer has been diluted with 25% of Ethyl acetate, 30% of normal propyl acetate to decrease the reactor temperature to 50°C. The solution was then further diluted with 10% of isopropanol. The required quantity of amines (as shown in Examples 2a to 2f, tables 3-8) were mixed with remaining 5% of isopropanol and added to the reactor within 30 seconds.
Formulation of the Ink
The ink composition of the present invention comprises the aforementioned polyurethane ink binder, a Nitrocellulose Varnish in Ethyl acetate (using 30% Isopropanol damped LX3/5 Nitrocellulose), a colourant (colouring agent) such as a pigment, an organic solvent, and additives. The Nitrocellulose Varnish in Ethyl acetate (using 30% Isopropanol damped LX3/5 Nitrocellulose) is contained in the ink composition in the range of 20- 50% by weight, more preferably 25- 45% by weight and most preferably 30 to 40% by weight.
The non-limiting organic solvents are selected from aromatic hydrocarbons, aliphatic alcohols, organic acid esters, aliphatic ketones, glycol ethers, aliphatic hydrocarbons or cycloaliphatic hydrocarbons.
Suitable aromatic hydrocarbons include but are not limited to toluene, xylene, ethylbenzene.
Suitable aliphatic alcohols include but are not limited to ethanol, Isopropanol, normal-propanol, isobutanol and 1-Methoxy,2-Propanol or mixtures thereof.
Suitable organic acid esters include but are not limited to methyl acetate, ethyl acetate, propyl acetate, butyl acetate and mixtures thereof.
Suitable aliphatic ketones include but are not limited to methyl ethyl ketone, methyl isobutyl ketone.
Suitable aliphatic hydrocarbons include but are not limited to pentane, hexane, heptane, octane, nonane, decane, isopentane, isohexanes, isopentanes, isooctanes, 2,2-dimethylbutane, and mixtures thereof.

Suitable cycloaliphatic hydrocarbons include but are not limited to cyclopentane, cyclohexane, methylcyclopentane, methylcyclohexane and mixtures thereof.
Mixtures of any of these aromatic hydrocarbons, aliphatic alcohols, organic acid esters, aliphatic ketones, glycol ethers, aliphatic hydrocarbons and cycloaliphatic hydrocarbons may also be used.
Preferably solvents are aromatic hydrocarbon free solvents.
Suitable Pigments are added in order to achieve the desired colour.
In one embodiment, preferably the pigment is one or more of an organic and/or an inorganic pigment that are generally used in inks, paints.
Examples of the organic pigments include azo, quinacridone, thioindigo, phthalocyanine, perinone, dioxazine, anthraquinone, perylene, isoindolinone, quinophthalone, azomethine-based and the like. The following examples but are not limited to, for example, carbon black, aniline black, carmine 6B, lake red C, permanent red 2B, disazo yellow, pyrazolone orange, carmine FB, chromophthal yellow and chromophthal red, phthalocyanine blue, phthalocyanine green, dioxazine violet, quinacridone magenta, quinacridone red, indanthrone blue, pyrimidine yellow, thioindigo Bordeaux, thioindigo magenta, perylene red, perinone orange, isoindolinone yellow, diketopyrrolopyrrole red, and daylight fluorescent pigments, and the like. The colour index (Colour Index International, abbreviation C.I.) as organic pigment of the colorant described in, an organic compound or an organometallic complex C. I. Pigment Black, C. I. Pigment Blue, C. I. Pigment Green, C. I. Pigment Red, C. I. Pigment Violet, C. I. Pigment Yellow, C. I. Pigment Orange, C. I. Pigment Brown are preferable.
Specifically, C. I. Pigment Black 7, C. I. Pigment Red 57: 1, C. I. Pigment Red 48: 1, C. I. Pigment Red 48: 2, C. I. Pigment Red 48: 3, C. I. Pigment Red 146, C. I. Pigment Red 242, C. I. Pigment Yellow 83, C. I. Pigment Yellow 14, C. I. Pigment Orange 38, C. I. Pigment Orange 13, C. I. Pigment Yellow 180, C. I. Pigment Yellow 139, C. I. Pigment Red 185, C. I. Pigment Red 122, C. I. Pigment Red 178, C. I. Pigment Red 149, C. I. Pigment Red 144, C. I. Pigment Red 166, C. I. Pigment Violet

23, C. I. Pigment Violet 37, C. I. Pigment Blue 15, C. I. Pigment Blue 15: 1, C. I. Pigment Blue 15: 2, C. I. Pigment Blue 15: 3, C. I. Pigment Blue 15: 4, C. I. Pigment Blue 15: 6, C. I. Pigment Green 7, C. I. Pigment Orange 34, C. I. Pigment Orange 64 and the like.
As the white inorganic pigment in the pigment, zinc oxide, zinc sulphide, titanium oxide, barium sulphate, calcium carbonate, chromium oxide, and silica.
The inorganic pigments other than white, for example, mica, aluminium powder, bronze powder, chrome yellow, cadmium yellow, chrome vermilion, cadmium red, ultramarine, aluminium hydroxide, Prussian blue, red iron oxide, yellow iron oxide, black iron oxide, zinc oxide, titanium oxide and the like.
The pigment is preferably present in a proportion of 1 to 30% by weight, more preferably 2-20% by weight and most preferably 5-15% by weight based on the total weight of the ink composition to ensure the concentration and colouring ability of the printing ink composition, is more preferable. Further, these pigments may be used alone or in combination.
The additives for the present invention can be selected from antioxidants, levelling agents, antistatic agents, resolubility additives, defoamer, adhesion promoter, anti-blocking agent, plasticizers, stabilizers or any combinations thereof.
The UV/LED topcoat is selected from the commercial grades such as SRJCTA032 (SARJO®COAT LED GLITTER GOLD); SRJCTA035 (SARJO®COAT LED PEA GOLD); SRJCTA001 (SARJO®COAT HIGH GLOSS OPM); SRJCTA002 (SARJO®COAT HIGH GLOSS/SCUFF OPM); SRJCTA009 (SARJO®COAT HIGH GLOSS OPM); SRJCTA022 (SARJO®COAT LMLO HIGH GLOSS UV OPM) from Yansefu® Inks and Coatings Private Limited, India.
Examples:
The present disclosure will now be explained in further detail by the following examples. These examples are illustrative of certain embodiments of the invention without being limited to the specific formulations given here.

Synthesis Example 1 : Polyester polvol formulation
The components and their quantity with the resulting Target Hydroxyl value of the polyester polyol formulation are given in the examples 1a, 1b, 1c, 1d, 1e and 1f in the following Tables 1 and 2.
Table 1
Table 2

Synthesis Example 2 : Polyurethane formulation
The components and their quantity with the measured Viscosity in poise @ 25°C of the polyurethane formulation are given in the examples 2a, 2b, 2c, 2d and 2e in the following Tables 3 to 8.
Example 2a
Table 3
Viscosity of the Polyurethane formulation in Example 2a (Table 3) as measured by Brookfield Viscometer is 14.8 poise at 25°C.

Example 2b
Table 4
Viscosity of the Polyurethane formulation in Example 2b (Table 4) as measured by Brookfield Viscometer is 13.5 poise at 25°C.
Example 2c
Table 5

Viscosity of the Polyurethane formulation in Example 2c (Table 5) as measured by Brookfield Viscometer is 13.8 poise at 25°C.
Example 2d
Table 6
Viscosity of the Polyurethane formulation in Example 2d (Table 6) as measured by Brookfield Viscometer is 15.1 poise at 25°C.

Example 2e
Table 7
Viscosity of the Polyurethane formulation in Example 2e (Table 7) as measured by Brookfield Viscometer is 15.6 poise at 25°C.
Example 2f
Table 8

Viscosity of the Polyurethane formulation in Example 2f (Table 8) as measured by Brookfield Viscometer is 14.2 poise at 25°C.
BEST MODES OF THE INVENTION
The most preferred six embodiments of the invention to prepare the polyurethane based ink composition are given as lnk-1, lnk-2, lnk-3, lnk-4, lnk-5, lnk-6 in Table 9 below.
Table 9

* Other aforementioned pigments or a mixture of pigments can be used to impart the desired colour to the ink composition.
Sample test result
The polyurethane ink formulation evaluation results have been provided in the following Table 10.
Table 10
*Rating: 1=poor; 5=Excellent

The above test results show that the novel polyurethane based ink compositions of the present invention exhibit improved compatibility and adhesion to ultra-violet / Light emitting diode (UV/LED) top-coat particularly on paper, metallised paper and foil papers.
Other embodiments and uses of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

We claim:
1. A polyurethane comprising: polyol units and polyisocyanate units, wherein the
total polyol content is in the range of 20-25% by weight,
wherein, said polyol includes 45-50% by weight of a first polyester polyol, 40-45% by weight of a second polyester polyol; and
10-15% by weight of polyether polyol, wherein, the polyurethane has an isocyanate to hydroxyl (-NCO /-OH) ratio of 2 to 2.3.
2. The polyurethane according to claim 1, wherein, the first polyester polyol has a number average molecular weight of 4000; and the second polyester polyol has a number average molecular weight of 2000.
3. The polyurethane according to claim 1, wherein the polyester polyols are adipate polyesters, wherein the diol in the polyester polyols is selected from methyl pentane diol (MPD), Methyl propane diol and Neopentyl Glycol; and the polyether polyol is selected from Polypropylene glycol (PPG)-1000, and Poly-Tetrahydrofuran-1000, or mixtures thereof.
4. The polyurethane according to claim 1, wherein the polyisocyanate content is about 15-17% by weight, wherein the polyisocyanate is selected from aromatic, cycloaliphatic and/ or aliphatic isocyanates, preferably a prepolymer where isocyanates are bound to a cycloaliphatic or an aliphatic moiety, more preferably, isophorone diisocyanate (IPDI).
5. An ink binder comprising the polyurethane according to claim 1.
6. An ink composition comprising 10-20 % by weight of the ink binder according to claim 5; 30-40% by weight of nitrocellulose varnish in Ethyl acetate, 35-45% by weight of an organic solvent, about 10% by weight of a colourant; and about 3% by weight of additives, wherein, suitable additives include one or more of an antioxidant, a levelling agent, an antistatic agent, a resolubility additive, a defoamer, an adhesion promoter, an anti-blocking agent, a plasticizer, and a

stabilizer, wherein the organic solvent is an aromatic or aliphatic solvent, preferably an aromatic-hydrocarbon-free solvent.
7. A method of manufacturing a polyurethane comprising: reacting a mixture of
polyols and a polyisocyanate, and an amine-type chain extender by means of a
tin-free catalyst for a urethane-forming reaction, wherein the total polyol content
is in the range of 20-25% by weight,
wherein, said total polyol content includes 45-50% by weight of a first polyester polyol, 40-45% by weight of a second polyester polyol; and 10-15% by weight of a polyether polyol,
wherein, the diol in the polyester polyols is selected from methyl pentane diol (MPD), Methyl propane diol and Neopentyl Glycol; and the polyether polyol is selected from Polypropylene glycol (PPG)-1000, and Poly-Tetrahydrofuran-1000,
wherein, the polyisocyanate content is about 15-17% by weight, wherein the polyisocyanate is selected from aromatic, cycloaliphatic and/ or aliphatic isocyanates, preferably a prepolymer where isocyanates are bound to a cycloaliphatic or an aliphatic moiety, more preferably, isophorone diisocyanate (IPDI),
wherein, the polyurethane has an isocyanate to hydroxyl (—NCO /—OH) ratio of 2 to 2.3, wherein the polyester polyols are adipate polyesters.
8. The method of manufacturing the polyurethane according to claim 7, wherein the first polyester polyol has a number average molecular weight of 4000; and the second polyester polyol has a number average molecular weight of 2000.
9. The method of manufacturing the polyurethane according to claims 7 and 8, wherein said tin-free catalyst for the urethane-forming reaction is at least one compound selected from the group consisting of organic zinc-based compounds, organic titanium-based compounds, organic zirconium-based compounds and organic bismuth-based compounds, wherein the catalyst is used in the range of 0.001 to 0.003% by weight of the total polyurethane manufacturing composition.

10. The method for manufacturing the polyurethane according to claim 7, wherein said chain extender is at least one compound selected from the group consisting of Isophorone diamine, aminoethyl ethanolamine, Ethylene diamine, monoethanolamine, diethylamine, Diethanol amine, trimethyl hexamethylene diamine, diethylene triamine or a combination thereof, preferably aminoethyl ethanolamine & trimethyl hexamethylene diamine, wherein the chain extender is used in the range of 5 to 10% by weight of the total polyurethane manufacturing composition.