Patent ID: 7842751
Filing Date: 2010-11-30
Classification: C08F,C08L,C09D,Y10T

Abstract:
1. A water-based paint composition comprising an emulsion resin (A), melamine resin (B) and hydrophobic solvent (C), wherein: the emulsion resin (A) is fine resin particles having core/shell type multilayered structure composed of the core made of a copolymer (I) obtained by copolymerization of 0.1-30 mass % of polymerizable unsaturated monomer (a) having at least two polymerizable unsaturated groups per molecule and 70-99.9 mass % of other polymerizable unsaturated monomer (b), and the shell made of a copolymer (II) obtained by copolymerization of 5-50 mass % of vinyl aromatic compound (c) and 50-95 mass % of other polymerizable unsaturated monomer (d), wherein the solid mass ratio of the copolymer (I)/copolymer (II) is within a range of 10/90-90/10; the melamine resin (B) has a weight-average molecular weight within a range of 1,000-5,000; the hydrophobic solvent (C) is an alcoholic solvent; and the water-based paint composition comprises the emulsion resin (A) within a range of 10-80 mass parts, the melamine resin (B) within a range of 5-50 mass parts, and the hydrophobic solvent (C) within a range of 10-100 mass parts, per 100 mass parts of solid resin content in the water-based paint composition.