E. I. Du Pont de Nemours and Company (Wilmington DE 02)
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43인용 특허 :
14
초록▼
A thermosetting acrylic powder coating composition contains an acrylic copolymer of a monoethylenically unsaturated monomer having at least one epoxy group and at least one monoethylenically unsaturated monomer which is free of epoxy groups, a carboxy-terminated primary crosslinking agent, a supplem
A thermosetting acrylic powder coating composition contains an acrylic copolymer of a monoethylenically unsaturated monomer having at least one epoxy group and at least one monoethylenically unsaturated monomer which is free of epoxy groups, a carboxy-terminated primary crosslinking agent, a supplementary crosslinking agent having at least one functional group which can react with either hydroxyl groups or carboxylic acid groups, and at least one ultraviolet light stabilizer or ultraviolet light screener capable of preventing degradation of the coating by ultraviolet light. An acrylic copolymer of methyl methacrylate, n-butyl methacrylate, and glycidyl methacrylate is favored. Preferably, the composition contains a combination of ultraviolet light stabilizer and ultraviolet light screener, is nonpigmented, and provides a clear, glossy, and durable film useful as the clear coat of a clear coat/color coat automobile finish.
대표청구항▼
A thermosetting powder coating composition of finely divided particles having a particle size of about 1 to 100 microns, wherein the particles are an intimately mixed blend consisting essentially of: A. an acrylic copolymer consisting essentially of polymerized monomers of: (1) about 8 to 35 percent
A thermosetting powder coating composition of finely divided particles having a particle size of about 1 to 100 microns, wherein the particles are an intimately mixed blend consisting essentially of: A. an acrylic copolymer consisting essentially of polymerized monomers of: (1) about 8 to 35 percent by weight, based on the weight of the copolymer, of a monoethylenically unsaturated monomer having the formula [Figure] where R1 and R4 are the same or different and are each selected from the group consisting of hydrogen and the methyl radical, and R2, R3, R5, and R6, are hydrogen and (2) about 65 to 92 percent by weight, based on the weight of the copolymer, of at least one monoethylenically unsaturated monomer which is free of epoxy groups selected from the group consisting of (a) styrene; (b) esters of acrylic or methacrylic acid having the formula [Figure] where R1 is selected from the group consisting of hydrogen and the methyl radical, and R7 is selected from the group consisting of C1-C20 aliphatic hydrocarbon radicals and C1-C20 aromatic hydrocarbon radicals. wherein the copolymer has a number average molecular weight of about 1,500 to 10,000, a weight average molecular weight of about 3,000 to 18,000, and a glass transition temperature of about 30°C. to 100°C; B. a carboxy-terminated crosslinking agent consisting of an aliphatic dicarboxylic acid having the formula HOOC-(CH2)n-COOH where n is an integer from 8-18; said crosslinking agent being present in an amount sufficient to provide 0.9-1.5 carboxylic acid groups for each epoxy group orginially in the copolymer; C. a supplementary crosslinking having at least one functional group which is capable of reacting with either hydroxyl groups or carboxylic acid groups, and which will not react until the the carboxylic-terminated crosslinking agent has reacted with the acrylic copolymer said supplementary crosslinking being present in an amount sufficient to provide 0.1-0.7 functional group for each epoxy group originally in the acrylic copolymer and is selected from the group consisting of an alkylated melamine formaldehyde resin, an alkylated glycoluril resin, an aliphatic glycidyl ether having the formula [Figure] an aliphatic glycidyl ester having the formula [Figure] where R8 is selected from the group consisting of the C1-C20 aliphatic hydrocarbon radicals, a cycloaliphatic epoxide having the formula [Figure] a cycloaliphatic epoxide having the formula [Figure] where R9 is selected from the group consisting of bivalent C6-C10 aromatic hydrocarbon radicals and bivalent C2-C20 aliphatic hydrocarbon radicals; and D. at least one agent capable of preventing the degradation of the coating by ultraviolet light wherein the agent has a weight average molecular weight of greater than 300 and a particle size of less than 40 microns.
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