Title of Invention

THERMOPLASTIC COATING COMPOSITION

Abstract

A thermoplastic coating composition for coating the thermoplastic and thermosetting plastic materials comprising a base coat comprising chlorinated polyolefin, a ketone-aldehyde resin, polar and nonpolar solvents, antiskinning and antisettling additives, metallic pigment, non-leafing aluminium paste, UV absorbers and coloured organic pigments; and a clear coat comprising acrylic resin and isocynate hardner. A process for the preparation of the thermoplastic metallic base coat for coating TPO without an adhesion promoting primer, for automotive application is given.

Full Text

FORM 2 THE PATENTS ACT, 1970 (39 of 1970) As amended by the Patents (Amendment) Act, 2005 The Patents Rules, 2003 As amended by the Patents (Amendment) Rules, 2005 COMPLETE SPECIFICATION (See section 10 and rule 13) TITLE OF THE INVENTION THERMOPLASTIC COATING COMPOSITION APPLICANTS Name Nationality Address AsianPPG Industries Ltd. Indian Company incorporated under incorporated Under the Companies Act, 1956 Technology Function, LBS Marg, Bhandup, Mumbai -400 078, Maharashtra, India. PREAMBLE TO THE DESCRIPTION The following specification particularly describes the nature of this invention and the manner in which it is to be performed: TECHNICAL FIELD: This invention relates to a thermoplastic coating composition. More particularly, it relates to a composition for coating directly to thermoplastic and thermosetting plastic materials without the aid of primer coat. This invention also relates to a process for the preparation of the thermoplastic coating composition for coating directly to thermoplastic and thermosetting plastic materials without the aid of primer coat. BACKGROUND OF THE INVENTION: Plastic materials such as thermoplastic olefins (TPO), which typically comprise of polypropylene and an elastomer, have many desirable properties, e.g., light weight, durability, low cost, etc., that make them an attractive material for manufacture of many interior and exterior automotive parts and accessories, containers, household appliances, and other commercial items. It is often desirable to coat articles made from such plastic materials with organic coating compositions to decorate them or to protect the plastic materials from degradation when exposed to atmospheric weathering conditions. To achieve longer lasting and more durable parts, it is essential that the coatings be tightly adhered to the surface of the plastic. It is often desirable, for decorative or functional reasons, to apply a coating over a plastic substrate. For certain substrates it has been difficult to find coating compositions that provide the required adhesion at a reasonable price and with suitable physical properties. It is well-known that it is difficult to obtain good adhesion of paints to olefinic substrates, including thermoplastic polyolefin (TPO) substrates and other such modified polyolefin-based materials. 2 Due to their relative non-polar nature, TPOs do not readily accept paint. Most paints are polar, and thus require a surface with some degree of polarity before it can adhere to the surface with any degree of desirable fastness. In the past, this problem has been addressed from number of different directions. One typical and relatively effective method of applying paint to a TPO is to first apply a primer to the TPO before applying the paint. Primers, while being effective, do add an additional step in the finishing of TPO articles. Commonly, the automobile body external panels are usually coated with multilayer coating film formed from a primer coating composition by electrodeposition coating composition, an anti-chipping primer, an intercoat coating composition and a topcoat for the purpose of imparting anti-corrosive properties and beautiful appearances. However, the above multilayer coating film generate drawbacks such as collision against the automobile body external panel of the pebbles, gravels, antifreezing agent, lumps of ice, etc, skipped up from on the road while the automobile is in motion and may produce mars on the multilayer coating film, to be extreme, local breakings and falling off of the multilayer coating film, poor coating film appearance, and exposure of the metal substrate, resulting in developing rust and corrosion. To avoid this, halogen free anti-chipping primer is used in the multilayer coating film. Thermoplastic olefins (TPOs) are uncrosslinked blends of olefin polymers and polyolefin elastomers. They can be made by physically blending in an internal mixer, or by polymerizing in a reactor. These materials are not paintable or coatable, because the paints or coatings consist of polar materials like urethanes, acrylics, epoxies, or melamines that have very poor adhesion to nonpolar materials like polyolefins. Typically, an adhesion promoter is used as the tie layer between the TPO substrate and the paint coating. This extra step adds to the cost of the product, and the coating is not that durable. 3 Conventional coloured base coats for car body, which are generally made of polyester, melamine, cellulose acetate butyrate resin ("CAB resin") or acrylic melamine resin, hardly have any adhesion to polyolefinic substrates consisting of so-called crystalline polyolefins with low polarity. For this reason, paints comprising of modified or copolymerized chlorinated polyolefin containing anhydride are used as colored base coat for the coating on polyolefinic substrates. Though they all have good adhesion to such substrates, these paints are used only for primer coating or 1-coat top coating because of problems such as no hardening, poor adhesion or poor secondary adhesion after washing with water, etc., which are vital problems for coating materials, in the coating made by the method of directly coating a colour base having painting pigment and completing the coating with a single baking, i.e. primerless 2-coat 1-bake system (wet on wet system of coloured base coat and top clear coat). Moreover, the paints containing modified or copolymerized chlorinated polyolefin containing anhydride which supplied today are mostly of lacquer type or urethane crosslinking with polyisocyanate and of short working life and, therefore, it is practically very difficult to use them by the primerless 2-coat, 1-bake method. Furthermore, the coated film obtained had a defect of yellowing regarding long-term weatherability and problems such as poor waterproofing, poor chemical resistance, etc. More specifically, they had a problem of producing dechlorination from polyolefinic substrate and modified chlorinated polyolefin containing anhydride, causing yellowing of aluminium pigment and top coat clear, etc. As an attempt for improving the polyolefinic substrate itself, various trials are being made such as plasma treatment (surface oxidation by oxygen plasma), flame treatment (surface oxidation by flame), ultraviolet ray treatment (furnishing of functionality by ultraviolet ray), etc. as measures for removing trichloroethane (improvement of adhesion). However, those measures also have problems such as unstable adhesion, etc. depending 4 upon the kind of polyolefinic substrate (degree of non polarity) and still remain in the study stage. Moreover, while it is possible to improve adhesion by introducing functional group into the polyolefinic substrate, it makes the substrate costly. Because of such defects, said formation of coated film is still insufficient in commercial value and has therefore not yet put to practical use. Plastic substrates made from a variety of thermoplastic and thermosetting plastic materials have widely varying surface properties including surface tension, roughness and flexibility, which make it difficult to achieve adequate adhesion of the organic ;.-£oatin&sJ;&._s^^ plastic materials. It is well known that for proper adherence of coatings to some plastic materials, the use of an adhesion promoter or tie coat is advisable. The application of an adhesion promoter or tie coat is normally an added step in the coating process where the adhesion promoter is usually applied in a thin layer, normally about 0.25 mils (6.25 microns). Typically, adhesion promoters used on TPO plastic surfaces contain chlorinated polyolefins. Some examples of which are described in U.S. Patent Nos. 4,997,882; 5,319,032: and 5,397,602. Additionally, flame or corona pretreatment steps can be used to facilitate adequate adhesion of organic coatings to some plastic substrates. The use of adhesion promoters and corona pretreatments in a coating system used to coat plastic substrates adds complexity and cost to the system. The application of an adhesion promoter usually entails coating the plastic substrate with the promoter, followed by some drying or curing time which increases the time of the entire coating process, and will usually necessitate additional work space. Accordingly, coating compositions which exhibit excellent adhesion directly to plastic materials such as TPO and RIM without the use of adhesion promoters or tie coats are 5 desirable. Secondly, TPO is relatively soft and it would be desirable to coat the substrate with a coating composition that can offer resistance to marring and scratching. Finally, uncoated or unpainted TPO may have unsatisfactory weathering properties (i.e., may degrade, discolor, or chalk during outdoor exposure) in certain applications, whereas it is known that coatings provide good weathering characteristics to many different substrates. For these reasons, then, it would be desirable to have means of applying a coating composition to an olefinic substrate to provide the properties that are lacking in the uncoated (raw) uncolored or colored substrate. Plastic substrates may be coated with curable, or thermosettable, coating compositions. Thermosettable coating compositions are widely used in the coatings art, particularly for high-performance primers and topcoats. Color-plus-clear composite coatings have been particularly useful as topcoats for which exceptional gloss, depth of color, distinctness of image, or special metallic effects are desired. In the past, it has been necessary to include one or more additional separate manufacturing steps to prepare an olefinic substrate for painting so that the coating layer could adhere to the olefinic substrate. According to a frequently used method, a thin layer of an adhesion promoter or tie layer is applied directly to the olefinic substrate. The desired coating layer or layers are then applied over the adhesion promoter. Such adhesion promoters typically include a chlorinated polyolefin. Adhesion promoters with chlorinated polyolefins are expensive to use, often exhibit instability, and, if used in a clear (unpigmented) composition, produce colored, hazy films. In addition, the chlorinated polyolefin materials may produce coatings with poor exterior durability because they are susceptible to degradation when exposed to UV light. Another method that has been used to prepare an olefinic substrate to receive a coating layer is chemical .-.v.-^v. - -■-•---....modification, of^the :substrate.surface,..for. example- by flame or corona pretreatment..-?-. The plastic parts which are used together with metal parts, especially in the automobile 6 industry, frequently receive a paint coating in the same color as that possessed by the other metal parts. At present, these plastic moldings are first provided with a primer and are then painted initially with a basecoat in the desired color and subsequently with a clearcoat. Both solventborne and aqueous paints are available for these purposes. In order to reduce the painting operation by the additional work step of priming, special formulas have been developed for solventborne paints (EP 455 211), which allow adhesion of the paint directly to the plastic surface without an additional primer coat. JP 5025301 discloses direct coating the surface of a resin molding without surface treatment such as primer coating by heat treating the molding composed of an olefin-based resin and a nonconjugated diene-containing copolymer resin and improving the paint acceptance of the molding surface. After heating gas treatment, a coating material is applied to the surface of a molding of a resin composition obtained by blending 100 pts. wt. olefinic resin (e.g. polypropylene resin) with 0.1-900 pts. wt. block and/or random copolymer resin (e.g. propylene-7-methyi-l,6-octadiene random copolymer) between one or more kinds of alpha-olefms and one or more kinds of nonconjugated dienes to obtain a durable coating film without surface treatment such as primer coating or plasma treatment. WO2004024839 (equivalent US 2005119400) discloses adhesion additive for an aqueous paint, which comprises at least one binder and/or at least one pigment and/or filler and also at least one halogenated polyolefin (HPO), water, up to 25% by weight of solvents and, if desired, additives customary for aqueous paints. By virtue of the adhesion additive it is possible to apply paint coatings directly to plastic substrates without a primer. JP 6328638 discloses not only coating a molded form directly with paint such as polyurethane paint, etc., having a low temperature impact resistance, heat resistance, rigidity, etc., sufficient in practical use in a state satisfied in actual use as the form such as an automotive exterior part without special pretreatment or primer treatment but also improve gasohol resistance at the time of using a primer. A sandwich resin composition is made of a core material and a surface layer substantially covering an entire surface of 7 the material in such a manner that the layer is formed of a composition containing propylene polymer, modified propylene polymer, ethyl en e-alpha-olefin copolymer rubber and oligomer having a functional group at an end at specific ratio. JP 8001705 discloses application of paint on the surface of resin member without employing primer treatment by a method wherein molding is performed by mixing modified polypropylene or olefin-based thermoplastic elastomer and olefin-based oligomer having polar group with each other at injection molding. On the surface of the resultant vehicular resin molded article, polyurethane-based paint having ester linkage is applied. In this case, by mixing olefin-based oligomer having polar group with molding resin member, the oligomer tends to appear on the surface of the resin member due to the low molecular weight of the oligomer. OBJECTS OF THE INVENTION: An object of the invention is to provide a thermoplastic coating composition for thermoplastic or thermosetting plastic materials without the aid of an adhesion promoting primer coat or tie coat thus making the coating cost-effective, efficient and simple. Another object of the invention is to provide the thermoplastic coatmg composition for thermoplastic or thermosetting plastic materials without the aid of flame or corona pretreatment and still provide excellent adhesion to uncoated plastic materials while overcoming the drawbacks of the compositions previously used. Another object of the invention is to provide a process for the preparation of the thermoplastic coating composition for thermoplastic or thermosetting plastic materials. DESCRIPTION OF THE INVENTION According to the invention there is provided a thermoplastic coating composition for thermoplastic and thermosetting plastic materials; the composition comprising; 8 a base coat comprising a chlorinated polyolefin, a ketone-aldehyde resin, polar and nonpoiar solvents, anti-skinning and antisettling additives, metallic pigments, UV absorbers and coloured pigments; and a clear coat comprising acrylic resin and isocyanet hardner. According to the invention, there is provided a process for the preparation of a thermoplastic coating composition for thermoplastic or thermosetting plastic materials; the process comprising, a) preparing a stable solution of chlorinated polypropylene by mixing the chlorinated polypropylene in non-polar solvent at 600 to 700 rpm; continuing the stirring at 900 to 1000 rpm till clear solution is obtained, adding solventless epoxy resin followed by mixing to obtain stable solution; b) preparation of Ketone-aldehyde solution by mixing the ketone-aldehyde resin in polar solvent at 900 to 1000 rpm to get clear solution; and c) cold blending of the stable solution of chlorinated polypropylene, the Ketone- aldehyde solution, polar and nonpoiar solvents, antiskinning and antisettling additives, metallic pigments, UV absorbers and coloured pigments to obtain thermoplastic coating composition. The chlorinated polyolefin has chlorination ratio of 20-40% and molecular weight upto 60,000. Preferably, the chlorination ratio of the chlorinated polyolefin is 20-25%. The melting point of the chlorinated polyolefin is 100-180° C, preferably near 180° C. The Gardener Colour value of the chlorinated polyolefin is between 10-15. The ketone aldehyde resin has acid number between 0.1 to 1.0 and hydroxyl Number between 10-50. The Gardener colour of the ketone aldehyde resin is in the range of 2-5 and the melting point of the ketone aldehyde resin is in the range of 70-90° C. The glass transition temperature of the ketone aldehyde resin is in between 40-70° C, preferably 40° C. 9 The solid content of the chlorinated polyolefin and the ketone aldehyde resin used in the coating is in the ratio of 50/50 to 70/30. The viscosity of 20-30% solution in hydrocarbon solvent of chlorinated polyolefin should be in the range of 20-40 centipoises, at 25-30° C. The non-polar solvent used in the coating composition is aliphatic and / or aromatic hydrocarbons like Toluene, Xylene or Cg-Cis aliphatic hydrocarbons like Solvent C-9, solvesso 100 or solvesso 150. The polar solvent used in the coating composition is selected from Dimethyl formamide, Tetrahydrofiiran, Methyl ethyl Ketone, Butyl cellosolve, Butyl acetate, Butyl glycol acetate, Ethyl carbitol acetate or combinations thereof. The anti-skinning additive used in the coating composition is selected from Methyl ethyl Ketone oxime or diethyl formamide or incombination thereof Any other antioxidant commercially available can also be used as anti-skinning additive in the coating composition. While selecting combination of antiskinning (rheological) additive, it should be noted that, the low shear viscosity must not be so high as to prevent adequate leveling of the base coat film. The anti-settling additive used in the coating composition is selected from fumed silica, synthetic Polyamide wax, organic derivative of montmorillonite clay or combinations thereof. The metallic pigment used in the coating composition is selected from non-leafing aluminium paste, gold leaf, beaten metals, aluminum and bronze powders available from 10 either US or Japanese or German suppliers, well known to industry. To achieve desired effect, one can used metallic pigment with different particle size. The coloured pigment used in the coating composition is depends upon the colour required for the coating. Thecoloured pigment is selected from the group of Phthalocyanine Green, Titanium Oxide, Carbon Black, Hydrated ferric oxide, Anthraquinone, Aminoketone, Monoazo benzimidazolone, Perylene, Indanthrone, or Quinacridone. The pigments used with aluminium /pearl pigments are mainly organic pigments to get desired colour shade. These pigments are automotive grades passing Florida exposure Test, well known for weatherability. The colour tinting can be done with the dispersion of these pigments in the same resin blend being used in the said metallic base coat. Alternatively, if very small amount of colour tinters are necessary, pigment concentrtates based on any compatible resin also can be used. The thermoplastic coating composition further comprises pearlescent or special effect pigment selected from commercially available mica coated with iron oxide or mica coated with titanium dioxide to achieve luster effects in coatings. The UV absorbers used in the coating composition is selected from the range of commercially available hindered amine light stabilizers and UV absorbers. The clear coat comprising acrylic resin and isocyanet hardner which is commonly called two pack polyurethane layers. The coating composition has following characteristics: Viscosity on Ford Cup B4 at 30 degree C : 20-30 seconds Specific gravity at 30 degree C : 0.930 Finish on hegmann guage : 5.00 % Non volatile matters : 22-25 %. 11 The coating composition of the invention is tested for Adhesion, Weatherometer, Humidity, Thermal shock resistance, Water and Soap Test, Petrol Resistance, Battery Acid Resistance, Brake Fluid Test, Distilled Water Immersion, Water Immersion at 70° C, Stability Test, Room Temperature Stability, etc, as follows: Method for panel preparation: PP-EPDM ( 10cm x 30 cm ) panels wipe with Iso Propyl Alcohol -> spray application of metallic base coat ( dry film thickness 15-20 microns ) -> flash off 8-12 minutes ->apply 2 K polyurethane clear ( dry film thickness 30-35 microns ) -> Flash off 8-12 minutes min. -» Baking at 70-80° C for 25-30 minutes. Check properties after keeping panels at ambient temperature for 72 hours: Property Method Results Adhesion (ASTM D 3359) 1.5 mm gap, 10/10 pattern Passes 100% Weatherometer ( Atlas CI 35 A) (ASTM G 53) 800 hours. Xenon arc lamp, 102 min. dry cycle followed by 18 min. water spray, continuous radiation for dry and wet cycles, relative Humidity: 60-80 %. No gloss reduction, No shade change. In light colours Delta -E is not more than 3. Thermal Shock Resistance 1 cycle = 7 hours at 78- 82, 1 hour at 25-29 degree C Degree C, 15 hours at -30 degree C & 1 hour at Room Temperature. Passes 4 cycles. No change in shade, gloss and adhesion properties Water & soap test Place 4 CC Soap Solution (Liquid soap: Deonised water =1:1).Place the test piece in oven at 70Degree C for 4 hours. Wash the surface gently. Check after 2 hours No change in colour & gloss, Adhesion passes. Petrol Resistance Place 2 CC of unleaded petrol. Allow petrol to evaporate at room temperature. No softness or color change 12 Check after 15 minutes Humidity 400 hours (ASTMD1735) % Relative Humidity 90-98. Temperature : 48-52 No blisters. Secondary adhesion passes. Battery acid resistance Immerse the test piece into Sulphuric Acid of 1.265 specific gravity, Temperature 38-42 Degree C, for 24 hours. Degree C,. Remove the specimen and rinse it gently with water and observe after two hours No softness, colour or gloss change Brake fluid Test Place 6 drops of brake fluid on the test piece at 40 degree C for 4 hours. Remove specimen and rinse gently with water and observe after two hours No softness, colour or gloss change Distilled Water immersion Immerse the test piece in Distilled Water at 40 degree C for 240 hours.Remove the test piece and observe after two hours No softness, colour or gloss change.Passes secondary adhesion Water Immersion at 70 Degree C Dip the panel in water for 4 hours at 70 ■ Degree C ,Remove and observe after one hour No softness, no colour or gloss change. Passes secondary adhesion. Stability test Place the paint in closed container in oven at 55 degree C, for 7 days .Check viscosity and finish. No viscosity pick up. No settling. No finish reversion. Room temperature stability Keep paint in closed container at room temperature, away from sunlight for 6 months Nominal viscosity pick up. No settling, no other change. The thermoplastic coating composition of the invention is used for coating the thermoplastic or thermosetting plastic materials without the aid of an adhesion promoting primer coat or tie coat thus making the coating cost-effective, efficient and simple. Further, it is used for coating of thermoplastic or thermosetting plastic materials without 13 the aid of flame or corona pretreatment and still provide excellent adhesion to uncoated plastic materials while overcoming the drawbacks of the compositions previously used. The wet on wet application of base coat and clear coat system will enable the use of this base coat without any modifications in existing process in automotive spray painting lines. The following experimental example is illustrative of the invention but not limitative of the scope thereof. Example 1: Preparing a stable solution of chlorinated polypropylene: 20 parts of the chlorinated polypropylene was mixed with 79 parts of Tolune at 600 to 700 rpm with high speed cowl type stirrer. The stirring was continued at 900 to 1000 rpm till clear solution obtained. 1 part of solventless epoxv resin, Bisphenol A- Epichlorihydrin derivative having epoxy equivalent in the range of 184-190, as a stabilizer was mixed with the clear solution to obtain stable solution. Preparation of Ketone-aldehyde solution. 7 parts of ketone-aldehyde resin was mixed with 2 parts of Butyl acetate and 3 parts of Butyl Glycol acetate at 900 to 1000 rpm with high speed with cowl type stirrer to get clear solution. The resin pellets were added slowly while stirring. Preparation of Thermoplastic coating composition. The stable solution of chlorinated polypropylene and the Ketone-aldehyde solution as obtained above was cold blended with 6 parts of Cellosolve acetate, 0.3 parts of Methyl Ethyl Ketone Oxime, 5 parts of Dimethyl Formamide, 3.50 parts of Non leafing aluminium paste 7130, 4.18 parts of Butyl acetate, 2.30 parts of Sico trans yellow pigment paste, 0.22 parts of Carbon Black pigment paste, 0.05 parts of Phthalocyanin green pigment paste, 7 parts of Disperlon 6900 ( 7% dispersion in acrylic resin ), 0.80 14 parts of Tinuvin 292, 1.60 parts of Tinuvin 1130 and 0.05 parts of Pigment pastes for final colour match. Thermoplastic coating composition. INGREDIENTS PERCENTAGE BY WEIGHT 20% solution of chlorinated polypropylene in Toluene 50.00 Ketone aldehyde resin 7.00 Butyl acetate 2.00 Butyl Glycol acetate 3.00 Toluene 7.00 Cellosolve acetate 6.00 Methyl Ethyl Ketone Oxime 0.30 Dimethyl Formamide 5.00 Non leafing aluminium paste 7130 from Toyo aluminium 3.50 Butyl acetate 4.18 Sico trans yellow pigment paste 2.30 Carbon Black pigment paste 0.22 Phthalocyanin green pigment paste 0.05 Disperlon 6900 ( 7% dispersion in acrylic resin) 7.00 Tinuvin 292 0.80 Tinuvin 1130 1.60 Pigment pastes for final colour match 0.05 TOTAL 100.00 The physical characteristics of the above coating composition were as below: 1. Viscosity on Ford Cup B4 at 30 degree C : 20-30 seconds 2. Specific gravity at 30 degree C 0.930 3. .Finish on hegmann guage 5.00 15 4. % Non volatile matters 22-25 % Properties of the coating were tested as below: Method for panel preparation : PP-EPDM ( 10cm x 30 cm ) panels wipe with Iso Propyl Alcohol -> spray application of metallic base coat ( dry film thickness 15-20 microns ) -> flash off 8-12 minutes ->apply 2 K polyurethane clear ( dry film thickness 30-35 microns ) -> Flash off 8-12 minutes min. -> Baking at 70-80 degree Centigrade for 25-30 minutes. The properties of the same were checked after keeping panels at ambient temperature for 72 hours: Property Results Adhesion Passes 100% Weatherometer ( Atlas CI 35 A) No gloss reduction, No shade change. In light colours Delta -E is not more than 3. Humidity 400 hours No blisters. Secondary adhesion passes. Thermal Shock Resistance Passes 4 cycles. No change in shade, gloss and adhesion properties Water & soap test No change in colour & gloss, Adhesion passes. Petrol Resistance No softness or color change Battery acid resistance No softness, colour or gloss change Brake fluid Test No softness, colour or gloss change Distilled Water immersion No softness, colour or gloss change. Passes secondary adhesion Water Immersion at 70 Degree C No softness, no colour or gloss change. 16 Passes secondary adhesion. Stability test No viscosity pick up. No settling. No finish reversion. Room temperature stability Nominal viscosity pick up. No settling, no other change. 17 CLAIMS: 1. A thermoplastic coating composition for thermoplastic and thermosetting plastic materials; the composition comprising; a base coat comprising a chlorinated polyolefin, a ketone-aldehyde resin, polar and nonpofar solvents, anti-ski'nnmg and anti-settling additives, metafile pigment, non-leafing aluminium paste, UV absorbers and coloured pigments; and a clear coat comprising acrylic resin and isocyanet hardner. 2. The thermoplastic coating composition as claimed in claim 1, wherein the chlorinated polyolefin has chlorination ratio of 20-40% and molecular weight upto 60,000. 3. The thermoplastic coating composition as claimed in claim 1, wherein the ketone aldehyde resin have acid number between 0.1 to 1.0 and hydroxyl Number between 10-50. 4. The thermoplastic coating composition as claimed in claim 1, wherein solids content of the chlorinated polyolefin and the ketone aldehyde resin used in the coating is in the ratio of 50/50 to 70/30. 5. A process for the preparation of thermoplastic coating composition for thermoplastic and thermosetting plastic materials; a) the process comprising of preparing a stable solution of chlorinated polypropylene by mixing the chlorinated polypropylene in non-polar solvent at 600 to 700 rpm; continuing the stirring at 900 to 1000 rpm till clear solution is obtained, adding solventless epoxy resin followed by mixing to obtain stable solution; b) preparation of Ketone-aldehyde solution by mixing the ketone-aldehyde resin in polar solvent at 900 to 1000 rpm to get clear solution; and c) cold blending of the stable solution of chlorinated polypropylene, the Ketone- aldehyde solution, polar and nonpolar solvents, antiskinning and antisettling additives, metallic pigments, UV absorbers and coloured pigments to obtain thermoplastic coating composition. 18 19 6) The process as claimed in claim 5, wherein the chlorinated polyolefm has chlorination ratio of 20-40% and molecular weight up to 60,000. 7) The process as claimed in claim 5, wherein the ketone aldehyde resin have acid number between 0.1 to 1.0 and hydroxyl Number between 10-50. 8) The process as claimed in claim 5, wherein solids content of the chlorinated polyolefm and the ketone aldehyde resin used in the coating is in the ratio of 50/50 to 70/30.

Documents:

880-mum-2009-abstract.doc

880-mum-2009-abstract.pdf

880-MUM-2009-CLAIMS(AMENDED)-(4-10-2012).pdf

880-MUM-2009-CLAIMS(AMENDED)-(7-3-2014).pdf

880-mum-2009-claims.doc

880-mum-2009-claims.pdf

880-mum-2009-correspondence(1-4-2009).pdf

880-MUM-2009-CORRESPONDENCE(15-1-2013).pdf

880-MUM-2009-CORRESPONDENCE(21-10-2013).pdf

880-MUM-2009-CORRESPONDENCE(24-7-2009).pdf

880-mum-2009-correspondence.pdf

880-mum-2009-description(complete).doc

880-mum-2009-description(complete).pdf

880-mum-2009-form 1(1-4-2009).pdf

880-MUM-2009-FORM 1(24-7-2009).pdf

880-mum-2009-form 1.pdf

880-MUM-2009-Form 13-090115.pdf

880-MUM-2009-FORM 18(24-7-2009).pdf

880-mum-2009-form 2(title page).pdf

880-mum-2009-form 2.doc

880-mum-2009-form 2.pdf

880-MUM-2009-FORM 26(24-7-2009).pdf

880-mum-2009-form 3.pdf

880-MUM-2009-MARKED COPY(7-3-2014).pdf

880-MUM-2009-OTHER DOCUMENT(7-3-2014).pdf

880-MUM-2009-Other Patent Document-090115.pdf

880-MUM-2009-REPLY TO EXAMINATION REPORT(4-10-2012).pdf

880-MUM-2009-REPLY TO HEARING(7-3-2014).pdf

880-MUM-2009-SPECIFICATION(AMENDED)-(7-3-2014).pdf