Patent No. U.S. 6,893,678 B2
Kansai Paint Co., Ltd. has received a patent for an aqueous coating composition used for coating the inner surface of a metal can. The composition is achieved by subjecting an acrylic-modified polyester resin obtained by graft polymerizing a polyester resin having ethylenic double bonds that has a number average molecular weight of 2,000 to 100,000. The ethylenic double bonds must also have a hydroxyl value of 10 to 120 mgKOH/g with a polymerizable unsaturated vinyl monomer that includes a carboxyl-containing polymerizable unsaturated monomer to neutralization and dispersion in an aqueous medium, the aqueous coating composition containing one to 40 parts by weight of resole phenol resin cross-linking agent based on 100 parts by weight of the acrylic-modified polyester resin.