DESC:
FIELD

The present disclosure relates to single pack clear overcoat composition and a method for preparation thereof.

DEFINITIONS

As used in the present disclosure, the following words and phrases are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used to indicate otherwise.
Single pack: The term “single pack” refers to the packaging of the disclosed composition that can be dispensed and applied without requiring the addition of other ingredients.
Clear coat: “Clear coat” is a coating applied to an already printed sheet or web.
Binder: The term “binder” refers to the film forming constituents of the composition, such as film forming polymers which includes crosslinking agents, adhesion promoting agents, and the like.
Substrate: The term “substrate” means any surface made of materials such as metals, wood, resinous, asphalt, leather, paper or any other surface, whether or not the surface was previously coated with the same or a different coating composition.
Overcoat/Overprint: The term “overcoat/overprint” means printing an additional material or another color on a substrate, form or sheet previously coated/printed.

Environmental protection: The term “environmental protection” means the protection of the coat/ color against outdoor damages such as UV radiation, rain, dust, mild acid and alkali, protection against petroleum fumes and petroleum products and enhanced outdoor durability.

Crack meter: The term “crack meter” provides quick and accurate method to determine the amount of color transferred from textile material (such as fabric or yarn) to other substrate by rubbing.

BACKGROUND
Overprint varnishes (OPVs) are coatings applied to an already printed sheet or web. The overprint varnishes are applied to enhance the gloss of printed sheet or web, to make printed sheet or web stain resistant, edge fusion resistant, burnish or scuff resistant, and resistant to discoloration.

Conventionally, two pack system overprint varnish compositions are used consisting of polyurethane as the adhesive and isocyanate based hardners. The isocyanates used to prepare the two pack system overprint varnish compositions are toxic and are hazardous to health. Also, the vehicle finishes obtained using the two pack system overprint varnish composition has limited shelf life and lower outdoor durability.
Further, the base coat/clear coat (pigmented coating overlaid with a clear coat layer) finishes for vehicles, such as automobiles, trucks, and fuel tankers, are widely used. Typically, the base coat/clear coat finishes are produced by a wet-on-wet method. In the method for applying a base coat/clear coat finish, a base coat (commonly referred to as a colour coat) containing the colour pigment and/or special effect imparting pigment, is applied and flash dried for a short period of time, but not cured. Then the clear coating composition, which provides protection for the colour coat and improves the gloss, distinctness of the image and overall appearance of the finish, is applied. The base coat and the clear coat are cured simultaneously. Optionally, the base coat can be dried and cured before application of the clear coat.
The clear coat finishes on automotive vehicles are often subjected to fuel/solvent spillages/damages caused by a variety of events during normal use. For example, material that come in contact with the clear coats under normal use on the roadways are stones, sand, metal objects and the like, that result into chipping of the clear coat finish. Poor resistance to fuels such as Petrol/Diesel/Xylene/IPA remains of the clear coat finish continues to be a problem for vehicle finishes. Also, the clear coat finish is subject to environmental damage caused, for example, by acid rain and exposure to UV light.
Therefore, there is felt a need for a composition that has enhanced resistance to fuels/solvents and that has an excellent appearance, good optical properties, good outdoor durability, and weather resistance.

OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows.
It is an object of the present disclosure to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
Another object of the present disclosure is to provide a single pack clear overcoat composition.
Still another object of the present disclosure is to provide a fuel/solvent resistant single pack clear overcoat composition.
Yet another object of the present disclosure is to provide a single pack clear overcoat composition that has an excellent appearance, good optical properties, good outdoor durability, and weather resistance.
Another object of the present disclosure is to provide an isocyanate free, single pack clear overcoat composition.
Still another object of the present disclosure is to provide a process for preparation of a single pack clear overcoat composition.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.

SUMMARY
The present disclosure relates to a single pack clear overcoat composition. The single pack clear overcoat composition comprises a resin mixture in an amount ranging from 30 wt% to 40 wt% of the total weight of the composition; a solvent system in an amount ranging from 50 wt% to 70 wt% of the total weight of the composition; a UV stabilizer in an amount ranging from 1 wt% to 2 wt% of the total weight of the composition; an anti-oxidant in an amount ranging from 1 wt% to 2 wt% of the total weight of the composition and a flow additive in the range of 1 wt % to 2 wt % with respect to the total weight of the ink composition. The resin mixture is a mixture of methyl methacrylate and vinyl acetate copolymer. The viscosity of the single pack clear overcoat composition can be in the range of 10 poise to 15 poise.

DETAILED DESCRIPTION
The conventional twin pack overcoat composition has a short pot life of the mixed product and hence results in the wastage of the product. The twin pack overcoat composition comprises isocyanide that acts as a cross linker, which starts cross linking immediately after mixing of the contents of the twin pack and hence an undesirable increase in the viscosity of the mixed product on storage is observed rendering it not usable. Further, the twin pack over coat composition has to be used within 30 minutes of mixing the contents of the twin pack, however, after mixing of the content, if any, delay occurs, it results in wastage as the mixed product cannot be used due to increased viscosity. Still further, the twin pack overcoat composition results in additional packaging and hence increase in the packaging cost.
The present disclosure envisages a single pack clear overcoat composition that mitigates the drawbacks mentioned herein above.
In one aspect of the present disclosure, there is provided a single pack clear overcoat composition. The single pack clear overcoat composition comprises a resin mixture in an amount ranging from 30 wt% to 40 wt% of the total weight of the composition; a solvent system in an amount ranging from 50 wt% to 70 wt% of the total weight of the composition; a UV stabilizer in an amount ranging from 1 wt% to 2 wt% of the total weight of the composition; an anti-oxidant in an amount ranging from 1 wt% to 2 wt% of the total weight of the composition and a flow additive in the range of 1 wt % to 2 wt % with respect to the total weight of the composition.
The viscosity of the single pack clear overcoat composition can be in the range of 10 poise to 15 poise.
The resin mixture may act as a binder and is a mixture of acrylic polymer, vinyl acetate copolymer and may further comprise terpolymer. The resin mixture is a mixture of methyl methacrylate sold as “Degalan® M890” is a registered trademark of methyl methacrylate; and vinyl acetate copolymer sold as “Vinnol® H15/50”, a registered trademark of vinyl acetate copolymer. Vinnol® H15/50 is a registered trademark containing a mixture of 85±1 wt% of vinyl chloride and 15±1 wt% of vinyl acetate.
In accordance with the present disclosure, the methyl methacrylate resin used in the single pack clear coat composition has a number average molecular weight of 60000 ~ 180000g / mol, a viscosity of 150 ~ 1000cps / 25 oC, typically the number average molecular weight of the methyl methacrylate resin is 65000 ~ 110000g / mol, and has a viscosity of 200 ~ 600cps / 25 oC.
Typically, the vinyl acetate copolymer resin used in the single pack clear coat composition has a molecular weight in the range of 60000 ~ 80000g / mol, and has a viscosity of 65 ~ 75 mPas / 20 oC.
In accordancwe with the present disclosure, the amount of methyl methacrylate is in the range of 50 wt% to 70 wt% and vinyl acetate copolymer is in the range of 30 wt% to 60 wt%.
The solvent system can be selected from the group consisting of alcohols, ketones, alkyl esters of acetic acids, alkyl esters of propionic acids, alkyl esters of butyric acids, ethers, dialkyl ethers, glycols, and aromatic hydrocarbon solvents. In accordance with the present disclosure, the solvent system can be selected from the group consisting of 2-Butoxyethanol acetate, 3,5,5-trimethyl-2-cyclohexene-1-one, C-9 solvent, methoxy propyl acetate, xylene, and gamma butyrolactone. In an exemplary embodiment of the present disclosure, the solvent system is a mixture of 2-Butoxyethanol acetate, 3,5,5-trimethyl-2-cyclohexene-1-one, and C-9 solvent.
The UV stabilizer can be at least one selected from the group consisting of benzophenone, benzoate, triazine, and triazole. In one embodiment of the present disclosure, the UV stabilizer is 2-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol.
In accordance with the present disclosure, the anti-oxidant can be octadecyl-3-(3,5-di-tertiarybutyl-4-hydroxyphenyl)-propionate and a mixture of 60 wt% to 80 wt% of bis(1,2,2,6,6-pentamethyl-4-piperidyl)-sebacate and 10 wt% to 30 wt% of methyl-(1,2,2,6,6-pentamethyl-4-piperdinyl)-sebacate, sold under a registered trademark “Tinuvin® 292”. Tinuvin® 292 containing hindered amine group is used for protecting against UV radiation.
The flow aid can be at least one selected from the group consisting of silicon fluid, polysiloxane copolymer, and polydimethyl siloxane. The flow additive can act as a dispersant which is required to have high thermal stability and changes observed in the viscosity of the composition due to changes in the temperature. In one embodiment of the present disclosure, the flow additive is polymethyl-phenylsiloxane.

In another aspect of the present disclosure, there is provided a process for preparing a single pack clear overcoat composition.
Firstly, a solvent system is prepared with a predetermined amount of solvent. In an embodiment, the solvent system is prepared with a predetermined amount of mixture of 2-Butoxyethanol acetate, 3, 5, 5-trimethyl-2-cyclohexene-1-one and C-9 solvent.
Sequentially, a resin mixture is added in the so obtained solvent system under stirring at 1000 to 1500 rpm, and controlled temperature of not more than 70 °C to obtain a clear solution. Stirring is continued till the resin mixture is completely dissolved in the solvent system and results in a clear solution that is free from particles; typically, samples are periodically withdrawn to examine the optical clarity of the solution. In one embodiment, the resin mixture is MMA (methyl methacrylate) and vinyl acetate copolymer (vinyl acetate and vinyl chloride). To the so obtained clear solution, the UV stabilizer is added under stirring.
Further, the antioxidant is added to the clear solution under stirring followed by addition of the flow aid to obtain a resultant solution.
In one embodiment, the antioxidant is octadecyl-3-(3,5-di-tertiarybutyl-4-hydroxyphenyl)-propionate and a mixture of of 60 wt% to 80 wt% of bis(1,2,2,6,6-pentamethyl-4-piperidyl)-sebacate and 10 wt% to 30 wt% of methyl-(1,2,2,6,6-pentamethyl-4-piperdinyl)-sebacate, sold under a registered trademark “Tinuvin® 292”; and the flow aid is polymethyl-phenylsiloxane.
The so obtained resultant solution is cooled to room temperature, followed by filtering to obtain the single pack clear overcoat composition. Filtration can be done by using a fabric filter, typically polyester filter having 77 to 100 thread/cm.
The single pack clear overcoat composition of the present disclosure can be packaged a suitable container, such as metal container.
The single pack clear overcoat composition provides fuel/solvent resistant overprint with consistent film thickness. The overprint has an excellent appearence, such as the overprint enhances the gloss effect of the applied overcoat on the screen printed print, good optical properties, provides good outdoor durability, and weather resistance. Also, the single pack clear coat composition is free of isocyanate.
The over coat provides environmental protection against UV radiation, rain, dust mild acid and alkali, enhances outdoor durability, protection against petroleum fumes and petroleum products having a shelf life of up to 5 years.
The present disclosure is further described in light of the following laboratory scale experiments which are set forth for illustration purpose only and not to be construed for limiting the scope of the disclosure. These laboratory scale experiments can be scaled up to industrial/commercial scale and the results obtained can be extrapolated to industrial/commercial scale.

EXPERIMENTAL DETAILS:

Experiment-1A: Preparation of the single pack clear overcoat composition in accordance with the present disclosure
The single pack clear overcoat composition in accordance with the present disclosure was prepared by the following general procedure.
The solvent system was first prepared using a mixture of 2-Butoxyethanol acetate, 3,5,5-trimethyl-2-cyclohexene-1-one, and C-9 solvent. To this solvent system, a resin mixture including Degalan® M890* and Vinnol® H15/50**was added under stirring at 1200 rpm at 65 oC to obtain a clear solution. 2-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol was added in the clear solution followed by addition of octadecyl-3-(3,5-di-tertiarybutyl-4-hydroxyphenyl)-propionate, Tinuvin® 292, (antioxidants) and polymethyl-phenylsiloxane (flow additive) to obtain a resultant solution.
The so obtained resultant solution was cooled to 30 oC and filtered by using a polyester fabric filter having 77 to 100 thread/cm. The filtrate was used as the single pack clear coat composition. The viscosity was measured for the single pack clear coat composition of experiment-1A using Rotothinner and was found to be 10 poise.
Experiment 1B to Experiment 1G: Preparation of the single pack clear overcoat composition in accordance with the present disclosure by combining the ingredients given in below table 1
The process for the preparation of the single pack clear overcoat composition was similar to experiment-1A except that the amount of Degalan® M890*, Vinnol® H15/50 and the solvent system were changed. The specific ingredients used and the amount of the ingredients used are summarized in Table-1. The viscosity was measured for the single pack clear overcoat composition of experiments 1B-1G using Rotothinner and was found to be 12 poise.

Table 1: List of ingredients and their amounts for the single pack clear composition

Description Qty (g)
Expt 1A Qty (g)
Expt 1B Qty (g) Expt 1C Qty (g) Expt 1D Qty (g) Expt 1E Qty (g) Expt 1F Qty (g) Expt 1G
Degalan® M890* (MMA) 20 21 23 24 18 19 21
Vinnol® H15/50*** (vinyl acetate copolymer) 15 14 12 11 17 16 14
2-Butoxyethanol acetate (solvent) 33 30 35 29 33 34 33
3,5,5-trimethyl-2-cyclohexene-1-one (solvent) 16 15 11 16 12 15 12
C-9 solvent (solvent) 10 14 13 14 14 10 14
2-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol (UV stabilizer) 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Octadecyl-3-(3,5-di-tertiarybutyl-4-hydroxyphenyl)-propionate (antioxidant) 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Tinuvin® 292** (antioxidant: protection against UV radiation) 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Polymethyl-phenylsiloxane (flow aid) 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Total 100 100 100 100 100 100 100

*Degalan® M890: Degalan® M890 is a registered trademark containing methyl methacrylate. **Tinuvin® 292: Tinuvin® 292 is a registered trademark containing a mixture of 60 wt% to 80 wt% of bis(1,2,2,6,6-pentamethyl-4-piperidyl)-sebacate and 10 wt% to 30 wt% of methyl-(1,2,2,6,6-pentamethyl-4-piperdinyl)-sebacate.
***Vinnol® H15/50: Vinnol® H15/50 is a registered trademark containing a mixture of 85±1 wt% of vinyl chloride and 15±1 wt% of vinyl acetate.

Experiment-2A: Characterization of overprint baked for 30 minutes at 80 °C and tested after 24 hours, using the single pack clear overcoat composition prepared in accordance with experiment-1A of the present disclosure
The substrate used for printing was opaque and clear vinyl. A base coat was printed by mesh 90T using a medium squeeze on an automatic press. The base coat used for printing included polymethyl methacrylate and vinyl copolymers. The base coat printed was IN-122 (Ink) in scarlet colour. The base coat was cured at 80 °C for 45 seconds by an infrared (IR) drier and the cured base coat was racked for overnight. Further, the overprinting on the base coat was performed using mesh 77T, 90T, and 120T for the single pack clear overcoat composition prepared in accordance with experiment-1A of the present disclosure. The overprint was cured at 80 °C for 45 seconds by IR drier. The overprints were then baked in an oven at 80 °C for 30 minutes. Further, the overprints were kept for 24 hrs. The tests for petrol/ Diesel/ Xylene/IPA resistance were carried out after 24 hours of baking of the overprint performed by using the single pack clear overcoat composition prepared in accordance with experiment-1A of the present disclosure.
A crock meter was used to perform petrol/ Diesel/ Xylene/IPA resistance test for the single pack clear overcoat composition. The overprints were applied on the crock meter. Cotton was dipped in petrol and then rubbed against the overprints with 1 N/m2 pressure back and forth, was considered as 1 rub.
Similarly, the crock tests with diesel /Xylene/IPA were performed and recorded.
The results obtained from petrol/ Diesel/ Xylene/IPA resistance test for the single pack clear overcoat composition prepared in accordance with experiment-1A of the present disclosure are given below in table 2 for 24 hours of baking of the overprint.
Table 2: Petrol/Diesel/Xylene/IPA resistance test for experiment-1A after 24 hours baking of the overprint

Experiment-1A Experiment-1A Experiment-1A
Mesh 77T 90T 120T
Petrol Resistance 85 rubs 70 rubs 65 rubs
Diesel Resistance 65 rubs 60 rubs 55 rubs
Xylene Resistance 60 rubs 55 rubs 50 rubs
IPA Resistance 100 rubs 80 rubs 70 rubs

It is clearly seen from the table 2 that the overprint obtained by 77T mesh using the single pack clear overcoat composition, prepared in accordance with experiment-1A of the present disclosure, and baked for 24 hours provides more resistance to Petrol/Diesel/Xylene/IPA as compared to 90T mesh and 120T mesh.
Experiment-2B: Characterization of overprint baked for 30 minutes at 80 °C and tested after 48 hours, using the single pack clear overcoat composition prepared in accordance with experiment-1A of the present disclosure
The process of overprinting using the single pack clear overcoat composition prepared in experiment-1A, and its characterization for Petrol/Diesel/Xylene/IPA resistance, was similar to experiment-2A except the baking of the overprint was for 48 hours.
The results obtained from the petrol/ Diesel/ Xylene/IPA resistance tests for the single pack clear overcoat composition prepared in accordance with experiment-1A of the present disclosure are given below in table 3 for 48 hours of baking of the overprint.
Table 3: Petrol/Diesel/Xylene/IPA resistance test for experiment-1A after 48 hours baking of the overprint

Experiment-1A Experiment-1A Experiment-1A
Mesh 77T 90T 120T
Petrol Resistance 100 rubs 85 rubs 70 rubs
Diesel Resistance 75 rubs 70 rubs 65 rubs
Xylene Resistance 80 rubs 65 rubs 70 rubs
IPA Resistance 100 rubs 85 rubs 70 rubs

It is clearly seen from the table 4 that the overprint obtained by 77T mesh using the single pack clear overcoat composition, prepared in accordance with experiment-1A of the present disclosure, and baked for 48 hours provides more resistance to Petrol/Diesel/Xylene/IPA as compared to 90T mesh and 120T mesh.

Comparative experiment 1: Characterization of overprint, baked for 30 minutes at 80 °C and tested after 24 hours, using the commercially available two pack system overprint varnish
The process of overprinting using commercially available two pack system overprint varnish, and its characterization for Petrol/Diesel/Xylene/IPA resistance, was similar to experiment-2A.
The results obtained from petrol/ Diesel/ Xylene/IPA resistance test for the commercially available two pack system overprint varnish are given below in table 4 for 24 hours of baking of the overprint.
Table 4: Petrol/Diesel/Xylene/IPA resistance test for commercial two pack system overprint varnish, after 24 hours

Conventional two pack Overcoat varnish
Mesh 77T 90T 120T
Petrol Resistance 65 rubs 55 rubs 40 rubs
Diesel Resistance 65 rubs 50 rubs 45 rubs
Xylene Resistance 70 rubs 60 rubs 40 rubs
IPA Test more than100 rubs more than100 rubs 80 rubs

Comparative experiment 2: Characterization of overprint, baked for 30 minutes at 80°C and tested after 48 hours, using the commercially available two pack system overprint varnish
The process of overprinting using commercially available two pack system overprint varnish, and its characterization for Petrol/Diesel/Xylene/IPA resistance, was similar to experiment-2B.
The results obtained from petrol/ Diesel/ Xylene/IPA resistance test for the commercially available two pack system overprint varnish are given below in table 5 for 48 hours of baking of the overprint.
Table 5: Petrol/Diesel/Xylene/IPA resistance test for commercial two pack system overprint varnish, after 48 hours
Conventional two pack overcoat varnish
Mesh 77T 90T 120T
Petrol Resistance 75 rubs 65 rubs 50 rubs
Diesel Resistance 75 rubs 60 rubs 55 rubs
Xylene Resistance 80 rubs 65 rubs 50 rubs
IPA Test more than150 rubs more than150 rubs 90 rubs

It is clearly seen from the tables 3 to 5 that the Petrol/Diesel/Xylene/IPA resistance for the overprint obtained by using single pack clear overcoat composition prepared in accordance with experiment-1A of the present disclosure is improved as compared to the commercial two pack system overprint varnish.

Experiment 3: Gloss studies for the overprint obtained in experiment-2A by using the single pack clear overcoat composition prepared in accordance with experiment-1A of the present disclosure and commercial two pack system overprint varnish.

The results of the gloss studies are given below in table 6.
Table 6: Gloss study results

Mesh 77T 90T 120T
Gloss
Overprint by experiment-1A single pack cleat coat composition 90 85 80
Commercial two pack system overprint varnish 90 80 75

It is seen from the table 6 that the 77T mesh used for overprinting allows more ink deposition (IN-122) as compared to 90T mesh and 120T mesh.
Similar process was carried out for the experiments 1B to 1G, however all the data is not provided for the sake of brevity. The results obtained were similar to the results obtained for experiment 1A.
Based on the above studies, it is evident that more the ink deposition (IN-122) while overprinting provides improved resistance to the fuels/solvents.

TECHNICAL ADVANCES AND ECONOMICAL SIGNIFICANCE
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a single pack clear overcoat composition that:
- provides fuel/solvent resistant overprint;
- provides an overprint that has an excellent appearance, good optical properties, good outdoor durability, and weather resistance; and
- is free of isocyanate.
The foregoing description of the specific embodiments fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values ten percent higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.
,CLAIMS:WE CLAIM:

1. A single pack clear overcoat composition comprising:
i. a resin mixture in the range of 30 wt % to 40 wt % with respect to the total weight of the composition;
ii. a solvent system in the range of 50 wt % to 70 wt % with respect to the total weight of the composition;
iii. a UV stabilizer in the range of 1 wt % to 2 wt % with respect to the total weight of the composition; and
iv. an anti-oxidant in the range of 1 wt % to 2 wt % with respect to the total weight of the composition; and
v. a flow additive in the range of 1 wt % to 2 wt % with respect to the total weight of the composition.
2. The composition as claimed in claim 1, wherein the viscosity of said composition is in the range of 10 poise to 15 poise.
3. The composition as claimed in claim 1, wherein said resin mixture is a mixture of acrylic polymer, vinyl acetate copolymer, and terpolymer.
4. The composition as claimed in claim 1 or 3, wherein said resin mixture is a mixture of methyl methacrylate and vinyl acetate copolymer.
5. The composition as claimed in claim 4, wherein the amount of methyl methacrylate is in the range of 50-70 wt% and vinyl acetate copolymer is in the range of 30-60 wt%.
6. The composition as claimed in claim 1, wherein said solvent system is selected from the group consisting of alcohols, ketones, alkyl esters of acetic acids, alkyl esters of propionic acids, alkyl esters of butyric acids, ethers, dialkyl ethers, glycols, and aromatic hydrocarbon solvents.
7. The composition as claimed in claim 1 or 6, wherein said solvent system is a mixture of 2-Butoxyethanol acetate, 3, 5, 5-trimethyl-2-cyclohexene-1-one, and C-9 solvent.

8. The composition as claimed in claim 1, wherein said at least one UV stabilizer is at least one selected from the group consisting of benzophenone, benzoate, triazine, and triazole.
9. The composition as claimed in claim 1 or 8, wherein said UV stabilizer is 2-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol.
10. The composition as claimed in claim 1, wherein said anti-oxidant is octadecyl-3-(3,5-di-tertiarybutyl-4-hydroxyphenyl)-propionate and a mixture of 60 wt% to 80 wt% of bis(1,2,2,6,6-pentamethyl-4-piperidyl)-sebacate and 10 wt% to 30 wt% of methyl-(1,2,2,6,6-pentamethyl-4-piperdinyl)-sebacate.

11. The composition as claimed in claim 1, wherein said flow additive is at least one selected from the group consisting of silicon fluid, polysiloxane copolymer, and polydimethyl siloxane.
12. The composition as claimed in claim 1 or 11, wherein said flow additive is polymethyl-phenylsiloxane.