Kansai Patents Aqueous Two-Package Clear Coating

March 25, 2014

U.S. 8,563,636 B2
Kansai Paint has been granted an aqueous two-package type clear coating composition comprised of (A) an aqueous dispersion of a hydroxyl group- and acid group-containing acrylic resin having a hydroxyl value of 30 to 200 mg KOH/g, an acid value of 5 to 50 mg KOH/g, a weight average molecular weight of 5,000 to 20,000, and a glass transition temperature of −30 to +40° C obtained by radical polymerization of 10 to 50 mass percent of a secondary hydroxyl group-containing monomer (a) and 50 to 90 mass percent of other unsaturated monomer (b), wherein the acrylic resin is obtained by solution polymerization, and the solution polymerization reaction is performed by a two stage polymerization method; and (B) a polyisocyanate curing agent obtained by mixing (c) a polyisocyanate compound and (d) a compound containing an anionic functional group, a polyoxyethylene group, and a hydrocarbon group.