Patent ID: 8575259

Claim:
A water-based paint composition, comprising (A) an aqueous film-forming resin, (B) a curing agent, and (C) crosslinked resin particles (C1) or crosslinked resin particles (C2), wherein the crosslinked resin particles (C1) have a core/shell multilayer structure composed of a core part of a (co)polymer (I) having a glass transition temperature (Tg 1 ) within a range of from −65° C. to -20° C. and obtained by (co)polymerizing a monomer component comprising 30-100 mass % of a polymerizable unsaturated monomer (c-1) having a C 6-18 alkyl group and 0-70 mass % of another polymerizable unsaturated monomer (c-2), and a shell part having a crosslinked structure of a copolymer (II) having a glass transition temperature (Tg 1 ) within a range of from −50° C. to 110° C. and obtained by copolymerizing a monomer component consisting of 0.1-40 mass % of a polymerizable unsaturated monomer (c-3) having at least two polymerizable unsaturated groups per molecule and 60-99.9 mass % of a polymerizable unsaturated monomer (c-4) having one polymerizable unsaturated group per molecule, wherein the polymerizable unsaturated monomer (c-4) contains 1-60 mass % of a hydroxyl-containing polymerizable unsaturated monomer, based on the total amount of the polymerizable unsaturated monomers (c-3) and (c-4), and wherein the crosslinked resin particles (C2) have a core/shell multilayer structure formed of the core part of the (co)polymer (I), and a shell part having a crosslinked structure of a (co)polymer (III) having a glass transition temperature (Tg 1 ) within a range of −50° C. to 110° C. and obtained by (co)polymerizing a monomer component consisting of 0.1-60 mass % of a functional group-containing polymerizable unsaturated monomer (c-5), 0-60 mass % of a polymerizable unsaturated monomer (c-6) having a functional group complementally reactable with the functional group in the polymerizable unsaturated monomer (c-5), 0-99.9 mass % of another polymerizable unsaturated monomer (c-7), and 1-60 mass % of a hydroxyl-containing polymerizable unsaturated monomer, based on the total amount of the polymerizable unsaturated monomers (c-5), (c-6), and (c-7).