Patent ID: 8309229

Claim:
A thermosetting water-borne coating composition comprising: (A) a polyester resin having a hydroxyl value within a range of 10-300 mgKOH/g, an acid value within a range of 10-100 mgKOH/g and a number-average molecular weight within a range of 400-6,000, wherein the resin is obtained by the steps of: reacting (a) a polyhydric alcohol, (b) a polyvalent carboxylic acid and/or a polyvalent carboxylic anhydride and (c) a monoepoxide compound having a chain or ring hydrocarbon group comprising at least 4 carbon atoms, to produce a polyesterpolyol having a hydroxyl value within a range of 50-600 mgKOH/g and a number-average molecular weight within a range of 400-2,000, and further reacting the polyesterpolyol with (d) a polyvalent carboxylic acid and/or a polyvalent carboxylic anhydride, wherein the polyester resin has a number-average molecular weight higher than that of the polyesterpolyol by 400-2,000; (B) a crosslinking agent; and (C) water-dispersible acrylic polymer particles (C-1) having a core/shell structure of which the core portion is intraparticulately cross-linked.