# US 4,400,479 A · Paint adapted for use as repair paint for damaged painted surfaces > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,400,479 A - Document ID: US4400479A - Status: Granted - Kind: A - Application number: 06/278,995 - Filed: 1981-06-30 - Granted: 1983-08-23 - Earliest claimed: 1980-07-03 - Assignees: Akzo N.V. - Inventors: Teunis M. Bos - Web page: https://patentgrep.com/patent/US4400479A ## CPC - C09D 133/08: Homopolymers or copolymers of acrylic acid esters - C08L 1/14: Mixed esters, e.g. cellulose acetate-butyrate - C08L 55/005: {Homopolymers or copolymers obtained by polymerisation of macromolecular compounds terminated by a carbon-to-carbon double bond} - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A coating composition adapted for repairing a damaged coating on a substrate comprises as the binder a mixture of a polyacrylate, an acrylated alkyd resin and a cellulose ester which form 100 percent of the binder. The coating composition is particularly well suited for use in preparing damaged paint on a motor vehicle body. The binder may be mixed with a volatile inert organic solvent for the binder in making the composition. The composition has a higher solids content than composition usually used for repairing damaged coatings and much thicker layers of the coating composition may be applied. By mixing the components of the binder in the ratio of 10 to 60 parts by weight of polyacrylate to 30 to 75 parts by weight of acrylated alkyd resin and 5 to 45 parts by weight cellulose ester to form the binder a coating composition having reduced tendency to crack and of improved solids content is obtained. ## Claims ### Claim 1 A coating composition adapted for repairing a damaged coating on a substrate comprising 1. 10-60 parts by weight of a polyacrylate having an acid number of 0-15 and a weight average molecular weight in the range of from 10,000 to 60,000, 2. 30-75 parts by weight of an acrylated alkyd resin having an acid number in the range of from 4 to 21 and a weight average molecular weight in the range of from 7,000 to 13,000, and obtained by polymerization of a mixture of 20-80 percent by weight of an acrylate monomer and 80-20 percent by weight of an ethylenically unsaturated alkyd resin having a weight average molecular weight in the range of from 500 to 1,500 and an iodine number in the range of from 20 to 70, and 3, 5-45 parts by weight of a cellulose ester, the three basic components together forming 100 parts by weight of the binder; and 4. A volatile inert organic solvent for 1, 2, and 3. ### Claim 2 (depends on 1) A coating composition according to claim 1, characterized in that the polyacrylate is at least 50 percent by weight moieties derived from acrylic acid or a derivative thereof. ### Claim 3 (depends on 1) A coating composition according to claim 1, characterized in that the polyacrylate is derived from methyl methacrylate, ethyl methacrylate or butyl acrylate. ### Claim 4 (depends on 1, 2) A coating composition according to claim 1 or 2, characterized in that the polyacrylate has an acid number in the range of from 0 to 10. ### Claim 5 (depends on 1, 2) A coating composition according to claim 1 or 2, characterized in that per 100 parts by weight the binder contains 20 to 35 parts by weight of the polyacrylate. ### Claim 6 (depends on 1) A coating composition according to claim 1, wherein the acrylated alkyd resin is obtained by polymerization of a mixture of methyl methacrylate, ethyl methacrylate, butyl methacrylate or acrylic acid and an ethylenically unsaturated alkyd resin. ### Claim 7 (depends on 6) A coating composition according to claim 6, characterized in that per 100 parts by weight the binder contains 45 to 65 parts by weight of the acrylated alkyd resin. ### Claim 8 (depends on 1) A coating composition according to claim 1, characterized in that the cellulose ester is a cellulose acetobutyrate. ### Claim 9 (depends on 1) A coating composition according to claim 1, characterized in that per 100 parts by weight the binder contains 10 to 25 parts by weight of the cellulose ester. ### Claim 10 (depends on 1) A coating composition according to claim 1, characterized in that the weight ratio of the acrylated alkyd resin to the sum of the polyacrylate and the cellulose ester is in the range of from 50:50 to 65:35. ### Claim 11 (depends on 1, 2, 6, 8, 9, 10) A coating composition according to claim 1, 2, 6, 8, 9 or 10 containing a plasticizer which is compatible with the polyacrylate and the acrylated alkyd resin. ### Claim 12 (depends on 11) A coating composition according to claim 11, characterized in that the plasticizer is butyl benzyl phthalate. ### Claim 13 (depends on 1, 2, 6, 8, 9, 10) A coating composition according to claim 1, 2, 6, 8, 9 or 10, characterized in that the plasticizer is present in an amount of not more than 10 percent by weight, based on the weight of the binder. ### Claim 14 (depends on 1, 2, 6, 8, 9, 10) A coating composition according to claim 1, 2, 6, 8, 9 or 10 containing an organic aluminum compound capable of forming a complex with functional groups, of the polyacrylate and the acrylated alkyd resin. ### Claim 15 (depends on 1, 2, 6, 8, 9, 10) A coating composition containing a binder having the composition of claim 1, 2, 6, 8, 9 or 10 dissolved in a volatile inert organic solvent substantially miscible with the binder.