Patent ID: 6914116

Claim:
A light-colored water based intercoat coating composition containing a hydroxyl group-containing resin (A), a curing agent (B) and a color pigment (C), a resulting coating film having a lightness index or a L value of 80 or more, the hydroxyl group-containing resin (A) comprising hydroxyl group-containing polyester resin (A 2 ) containing as essential components an alicyclic polybasic acid (a 1 ) and/or an alicyclic polyhydric alcohol (a 2 ), other polybasic acid (a 3 ) and other polyhydric alcohol (a 4 ), a content of the alicyclic polybasic acid (a 1 ) and/or the alicyclic polyhydric alcohol (a 3 ) in the polyester resin (A 2 ) being in the range of 20 to 70% by weight based on a total solid content of monomers constituting the polyester resin (A 2 ), the curing agent (B) being a blocked polyisocyanate curing agent (B 1 ) blocked with a pyrazole blocking agent, or a mixture of the blocked polyisocyanate curing agent (B 1 ) with at least one curing agent selected from the group consisting of a blocked polyisocyanate curing aaent (B 2 ) blocked with a blocking agent other than the pyrazole blocking agent, a water-dispersible blocked polvisocyanate curing agent (B 3 ) and a melamine resin curing agent (B 4 ).