| abstract |
(57) [Summary] [Purpose] To provide a waterborne coating for normal drying, which is suitable for coating building exteriors, bridges, vehicles, and the like. [Structure] 0.01 to 2 mol of the dihydrazide compound (B) as a crosslinking agent is added to the carbonyl group-containing copolymer aqueous dispersion (A) per 1 mol of the carbonyl group, and a diisocyanate compound and a carboxyl group are further added. An aqueous polyurethane resin (C) obtained by reacting a hydrazine derivative by neutralizing a carboxyl group of a polyurethane obtained by a reaction with a glycol compound containing a carbonyl group-containing copolymer aqueous dispersion (A) having a solid content of 100 5 to 1 by weight A water-based paint for normal drying that contains 50 parts by weight. |