Patent ID: 7989521

Claim:
An antifouling coating composition comprising: (A) a triorganosilyl ester-containing copolymer obtained from a mixture of (a) a triorganosilyl (meth)acrylate monomer represented by a general formula (1): R 1 is a hydrogen atom or a methyl, and R 2 , R 3 , and R 4 are equal or different from each other, and each represents an alkyl group or a phenyl group, wherein the alkyl group has 3 to 6 carbons and the alpha carbon thereof is branched; and (b) an ethylenically unsaturated monomer copolymerizable with the triorganosilyl (meth)acrylate monomer; and (B) a modified rosin salt which is a salt of a modified rosin and zinc and/or copper, the modified rosin containing, in an amount of 80 weight % or more, two or more members selected from the group consisting of dihydroabietic acid, tetrahydroabietic acid, dehydroabietic acid, pimaric acid, isopimaric acid, and dihydropimaric acid.