Patent ID: 7981964

Claim:
A heat-hardenable paint composition comprising a base resin, wherein the base resin comprises: (A) a lactone modified acrylic resin comprising hydroxyl groups, wherein: 20 to 70 weight percent of the structural units are based on a lactone compound; and the hydroxyl group value is from 50 to 400 mg KOH/g, and wherein the lactone modified acrylic resin comprising hydroxyl groups (A) comprises a reaction product of a ring-opening addition reaction of a lactone with a hydroxyl group containing resin produced by copolymerization of: (a) an acid compound comprising one carboxyl group and two or more hydroxyl groups; (b) a radically polymerizable monomer comprising epoxy groups; and (c) other radically polymerizable monomers; and (B) an acrylic resin comprising hydroxyl groups and cyclic structures, wherein: 10 to 80 weight percent of structural units are based on a radically polymerizable monomer comprising a cyclic structure; and the hydroxyl group value is from 50 to 150 mg KOH/g; and a crosslinking resin comprising an isocyanate compound; wherein the weight ratio of the solid fractions of (A):(B) in the base resin is from 95:5 to 20:80.