Claims:WE CLAIM
1. A breathable and water proof fabric that is permeable to air and impermeable to liquid water, the fabric comprising:
a bioplastic mixture comprising a mixture of corn-starch, vinegar, and glycerin;
a resin mixture comprising perfluorooctanoic acid, dimethylol dihydroxy ethylene urea and water; wherein bioplastic mixture and the resin mixture are applied to an untreated fabric to form the breathable and water proof fabric; wherein the perfluorooctanoic acid bonds with the untreated fabric to form of an ester linkage.

2. The breathable and water proof fabric of claim 1, wherein an amount of corn starch in the bioplastic mixture is in the range of 50-70 gram/litre.

3. The breathable and water proof fabric of claim 1, wherein an amount of vinegar in the bioplastic mixture ranges between 3-7 gram/litre.

4. The breathable and water proof fabric of claim 1, wherein an amount of glycerin the bioplastic mixture ranges between 2-5 gram/litre.

5. The breathable and water proof fabric of claim 1, wherein the breathable and waterproof fabric has a water repellency of 100.

6. The breathable and water proof fabric of claim 1, wherein the breathable and waterproof fabric has an oil repellency of 6.5.

7. The breathable and water proof fabric of claim 1, wherein the breathable and waterproof fabric has air permeability of 180 mm/sec, wherein the air permeability factor dependent on the tightness factor of the fabric.

8. A process of creating a breathable and waterproof fabric, the process comprising:
preparing a first composition of a plurality of ingredients comprising corn-starch, vinegar, and glycerin,
heating the first composition between 70 to 80 degree Celsius for between 10-12 minutes;
adding a second composition to the prepared primary composition to form a third composition, wherein the second composition comprises:
perfluorooctanoic acid within the range of 60-90 gram/litre,
dimethylol dihydroxy ethylene urea within the range 40-60 gram/litre and water of 850-900 millilitres; and
applying the third composition uniformly across an untreated fabric by dipping and circulating the fabric in an application machine for 10-15 minutes at room temperature to create a treated fabric.

9. The process of claim 8, further comprising curing the treated fabric by extracting excess water at a temperature of 150 degree C for a time period of 10-15 minutes to form the breathable and waterproof fabric,

10. The process of claim 8, wherein the primary composition is porous in structure.
, Description:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(Section 10, rule 13)

“BREATHABLE AND WATERPROOF FABRIC”

Myntra Designs Private Limited
3rd Floor, AKR Tech Park, Krishna Reddy Industrial Area, Muneshwara Nagar, Bangalore 560068

The following specification particularly describes the invention and the manner in which it is to be performed

 
BREATHABLE AND WATERPROOF FABRIC

BACKGROUND
[0001] The present invention relates generally to shoes and garment products and more particularly to a composition and process to produce a breathable and waterproof fabric.
[0002] With the continuous improvement of people's living standards and the continuous advancement of science and technology, a variety of functional textile fabrics continue to emerge, with anti-ultraviolet function, waterproof function, deodorant and antibacterial function, quick-drying function, etc. The current functional textile fabrics are widely used in the production of clothing, footwear and accessories to meet the needs of people at different times in daily life. There is a great demand for waterproof clothing and footwear, but many waterproof fabrics do not have the additional function of being porous to air.
[0003] For example, for a shoe to be comfortable for the user, one must ensure proper exchange of heat and water vapor between the microclimate inside the shoe and outside. This exchange of heat and water vapor, however, must not compromise in any way to the impermeableness of the shoe to external humidity or water. The control of moisture or body fluids such as perspiration within shoes has been a problem for many years. Because the foot is enclosed within a shoe, it is difficult for it to breath and evaporate moisture or perspiration that collects against the skin.
[0004] Many systems have been developed to address the build-up of moisture in a shoe. It is known in the art that water and oil repellent shoe fabric or lining can be made with simple fluorocarbon chemistry, as fluorocarbon will create a continuous film on the surface of a fabric which can repel water and oil. However, this makes the material impermeable, or in other words, air freely pass though the shoe thus making it uncomfortable for the user. In addition, such fabrics are also expensive to manufacture thus making all resultant products expensive.
[0005] Therefore, there is a need to produce highly functional and cost effective waterproof and breathable fabric that has excellent moisture permeability.
SUMMARY
[0006] The following summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, example embodiments, and features described, further aspects, example embodiments, and features will become apparent by reference to the drawings and the following detailed description. Example embodiments provide system and method for identification of similar images across various domains.
[0007] Briefly, according to one aspect of the invention, a breathable and water proof fabric that is permeable to air and impermeable to liquid water is provided. The fabric comprises a bioplastic mixture comprising a mixture of corn-starch, vinegar, and glycerin and a resin mixture comprising perfluorooctanoic acid, dimethylol dihydroxy ethylene urea and water. The bioplastic mixture and the resin mixture are applied to an untreated fabric to form the breathable and water proof fabric. Further, the perfluorooctanoic acid bonds with the untreated fabric to form of an ester linkage.
[0008] In another example embodiment, a process of creating a breathable and waterproof fabric is provided. The process includes preparing a first composition of a plurality of ingredients including corn-starch, vinegar, and glycerin and heating the first composition within a range of 70 to 80 degree Celsius for about 10-12 minutes. The process further includes adding a second composition to the firsy composition to form a third composition. The second composition comprises perfluorooctanoic acid within the range of 60-90 gram/litre, dimethylol dihydroxy ethylene urea within the range 40-60 gram/litre and water of 850-900 milliliters. Further, the third composition is applied uniformly across an untreated fabric by dipping and circulating the fabric in an application machine for 10-15 minutes at room temperature to create a treated fabric.

BRIEF DESCRIPTION OF THE FIGURES
[0009] These and other features, aspects, and advantages of the example embodiments will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
[0010] FIG. 1 is a flow chart illustrating one process by which a waterproof and breathable fabric is produces, according to an aspect of the present invention.
DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS
[0011] Various example embodiments will now be described more fully with reference to the accompanying drawings in which only some example embodiments are shown. Specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments. Example embodiments, however, may be embodied in many alternate forms and should not be construed as limited to only the example embodiments set forth herein.
[0012] Before discussing example embodiments in more detail, it is noted that some example embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations as sequential processes, many of the operations may be performed in parallel, concurrently or simultaneously. In addition, the order of operations may be re-arranged. The processes may be terminated when their operations are completed, but may also have additional steps not included in the figures. It should also be noted that in some alternative implementations, the functions/acts/steps noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0013] The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. As used herein, the singular forms “a,” “an,” and “the,” are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the terms “and/or” and “at least one of” include any and all combinations of one or more of the associated listed items. It will be further understood that the terms “comprises,” “comprising,” “includes,” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
[0014] The present invention provides a waterproof, breathable fabric useful in rainwear, sportswear, tents, automotive, marine and industrial covers, and other areas where the qualities of breathability and waterproofness are desired. The fabric is rendered waterproof and breathable through the use of a bioplastic mixture including a mixture of corn-starch, vinegar, and glycerin and a resin mixture including perfluorooctanoic acid, dimethylol dihydroxy ethylene urea and water. In an example, the bioplastic mixture and the resin mixture are applied to an untreated fabric to form the breathable and water proof fabric. The perfluorooctanoic acid bonds with the untreated fabric to form of an ester linkage. The mixture of corn-starch, vinegar, and glycerin are heated 70 degrees C - 80 degrees C for 10-12 minutes to form of a paste. The amount of corn starch in the bioplastic mixture is in the range of 50-70 gram/litre, the vinegar in the bioplastic mixture ranges between 3-7 gram/litre, the glycerin the bioplastic mixture ranges between 2-5 gram/litre.
[0015] Further addition of resin mixture of perfluorooctanoic acid, dimethylol dihydroxy ethylene urea and water of 850-900 ml. to make the final mixture or composition ready for application. The perfluorooctanoic acid of 60-90 gram/litre is added which is acid-free fluorine-based water repellent and a crosslinking agent are further added to an untreated fabric. The crosslinking agent may be of may include an isocyanate-based crosslinking agent, a melamine-based crosslinking agent, a carbodiimide-based crosslinking agent, and an oxazoline-based crosslinking agent.
[0016] Further, in the mixture, the dimethylol dihydroxy ethylene urea of 40-60 gram/litre is added. Typically, the modified ethylene urea resin is dimethylol dihydroxy ethylene urea (DMDHEU), but other modified ethylene urea resins could be used, such as dimethylol ethylene urea (DMEU) or dimethylol urea/glyoxal (DMUG). The resins are normally used in conjunction with a catalyst to promote crosslinking of the resin with the fibers upon heating.
[0017] The end product of the mixture is having a porous in structure and entrap the molecules of Perfluorooctanoic acid and dimethylol dihydroxy ethylene urea and create a porous layer over the treated fabric which will allow air to pass through. The application method can be continuous form where the composition can be applied to continuous sheet of fabric in fabric finishing machine (such as stenter) followed by curing at 150 degree C for 5-7 min at continuous curing machine.
[0018] The treated fabric has been tested as per AATCC method. In which the water repellency initial 100, and after 15 home laundering is 90. The oil repellency initially was 6.5, and after 15 home laundering is 5.
[0019] The air permeability is 180 mm/sec. However, the air permeability factor is dependent on tightness factor of the fabric Tighter the fabric lesser will be the air permeability. The selection of fabric can increase or decrease the value of air permeability. Moreover, the mixture and the followed process make the entrap fluorocarbon in such a way, so that it can create tiny spaces in between the film of fluorocarbon or in other ward the continuous film of fluorocarbon can be broken down with tiny spaces in between to allow air to pass through.
[0020] FIG. 1 schematically illustrates the process 100 of the present invention in which a porous layer is created over a fabric to impart a breathable and water repellent properties. At step 110, a primary composition is prepared with ingredients including fluorocarbon, corn-starch, vinegar, and glycerin. These ingredients are heated about 70 degree C to 80 degree Celsius for 10-12 min in order to make a paste.
[0021] At step 120, a secondary composition is added to the paste. The secondary composition including the ingredients of Perfluorooctanoic acid of 60-90 gram/litre, Dimethylol dihydroxy ethylene urea of 40-60 gram/litre and water of 850-900 ml. Once the final composition is prepared i.e. third composition including the primary and the secondary, at step 130, depositing the same to an untreated fabric by the process of dipping and circulation process in a washing machine for 10-15 minutes at room temperature. The purpose of dipping and circulation are processes in such a way , so that the composition leave a uniform deposit upon the fabric.
[0022] At step 140, the method use hydro-extraction process to remove portion of the water contained therein and further curing at temperature of 150 °C for 10-15min to fix the final composition on the surface of the fabric. The final composition is having a porous in structure which entrap the molecules of Perfluorooctanoic acid and Dimethylol dihydroxy ethylene urea and create a porous layer over the treated fabric which will allow air to pass through. The process of drying the treated fabric in order to impart a breathable and water proof properties. stain resistant, and wrinkle-free properties to the fabric.
[0023] While only certain features of several embodiments have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the scope of the invention and the appended claims.