Patent ID: 7291666

Claim:
An emulsion polymer resin composition which contains a hydroxyl group and a functional group reactive with a hydroxyl group within the same particle and has a weight average molecular weight of not less than 10000 but not more than 500000 and an average particle diameter is not less than 50 nm but not more than 300 nm, wherein said emulsion polymer resin composition is obtained by polymerizing a polymerizable unsaturated monomer composition comprising, as essential components, a polymerizable unsaturated monomer having a hydroxyl group and a polymerizable unsaturated monomer having an alkoxyalkylamide group and/or a blocked isocyanate group, and wherein the polymerizable unsaturated monomer composition contains α-methylstyrene, and wherein the α-methylstyrene content in 100 mass % of the polymerizable unsaturated monomer composition is not less than 1 mass % but not more than 50 mass %, and wherein the ratio of equivalent amount of the functional groups of the polymerizable unsaturated monomer having a hydroxyl group to the polymerizable unsaturated monomer having a functional group reacts with a hydroxyl group in the polymerizable unsaturated monomer composition is 100/5 to 100/100.