Composition for coating material

Abstract

An object of the present invention is to obtain a coating composition capable of providing a coating film that has hydrophobilicy and is resistant to adhesion of water stain dirt. The present invention provides a composition for a coating material, including a siloxane group-containing polymer (A) and a crosslinking agent (B), wherein the siloxane group-containing polymer (A) is a block copolymer including an A block and a B block, contains, in the A block, at least a structural unit derived from a siloxane group-containing vinyl monomer (a), and contains, in the B block, a structural unit derived from a hydroxyl group-containing vinyl monomer (b) and, as necessary, a structural unit derived from another vinyl monomer (c) copolymerizable with the vinyl monomers (a) and (b), the siloxane group-containing polymer (A) is a copolymer having a molecular weight distribution (Mw/Mn) of 2.0 or less and polymerized by living radical polymerization, and the composition has a dynamic glass transition temperature of 100 to 300° C. under conditions of a temperature raising rate of 2° C./min and a frequency of 8 Hz when cured.

Dependencies are inferred from the claim text.