Patent ID: 7357962

Claim:
An automobile body-used light-colored water based coating composition essentially consisting of a water dispersion (A 1 ) prepared by water-dispersing a block copolymer resin (A) comprising a block (a 1 ) obtained by polymerizing a monomer component containing an olefin monomer and a block (a 2 ) obtained by polymerizing a monomer component containing a carboxyl group-containing or carboxylic anhydride group-containing vinyl monomer, a hydroxyl group-containing resin (B), a curing agent (C), a water dispersion (D 1 ) prepared by water-dispersing a resin particle (D) containing in the same particle a copolymer of an olefin monomer and a copolymer of a vinyl monomer or an urethane emulsion (E), and a color pigment, the hydroxyl group-containing resin (B) being a polyester resin containing as essential components an alicyclic polybasic acid and an alicyclic polyhydric alcohol, a content of the alicyclic polybasic acid and the alicyclic polyhydric alcohol being in the range of 20 to 70 percent by weight based on a total solid content of monomers constituting the polyester resin, the curing agent (C) including a blocked polyisocyanate curing agent blocked with a pyrazole compound consisting of 3, 5-dimethylpyrazole, a resulting coating film having a lightness L* value in accordance with a L*a*b* color system as defined in JIS Z 9729 in the range of 80 or more, and showing excellent anti-chipping properties.