Patent ID: 7960475

Claim:
A powder coating composition comprising, as essential components, an epoxy group-containing vinyl copolymer (A) with a glass transition temperature of 40° C. or higher, an epoxy group-containing vinyl copolymer (B) that contains organosiloxane side chains and has a glass transition temperature of 0° C. or lower, and a polyvalent carboxylic acid (C), wherein said organosiloxane side chains within said epoxy group-containing vinyl copolymer (B) are side chains obtained using an organosiloxane represented by a general formula [I] shown below: wherein, R 1 represents a hydrogen atom or a methyl group, R 2 represents a bivalent hydrocarbon group of 1 to 12 carbon atoms, or a bivalent hydrocarbon group that contains an ether linkage and/or ester linkage, R 3 represents a monovalent hydrocarbon group of 1 to 8 carbon atoms, m represents an integer from 1 to 3, and n represents an integer from 0 to 250; and wherein said epoxy group-containing vinyl copolymer (B) has a lower SP value than that of said epoxy group-containing vinyl copolymer (A), and a difference in SP values between said epoxy group-containing vinyl copolymer (A) and said epoxy group-containing vinyl copolymer (B) is within a range from 1.0 to 4.0; and wherein a quantity of said organosiloxane side chains within said epoxy group-containing vinyl copolymer (B) is within a range from 0.01 to 5% by weight relative to the combined weight of said epoxy group-containing vinyl copolymer (A) and said epoxy group-containing vinyl copolymer (B).