| abstract |
(57) An object of the present invention is to provide an aqueous topcoat one-coat coating composition capable of forming a coating film excellent in recoat adhesion, water resistance, weather resistance and chipping resistance, and a coating film forming method using the same. (A) A polyester resin having an acid value of 10 to 70 mgKOH / g, a hydroxyl value of 70 to 170 mgKOH / g, and a benzene ring concentration of 1.25 mol / kg (resin solid content) or less, and (B) a curing agent. (C) a colored pigment, and (D) (a) a polymerizable unsaturated monomer containing at least one ionic functional group selected from a tertiary amino group, a quaternary ammonium base and a sulfonic acid group, (b) Acrylic resin for pigment dispersion obtained by copolymerizing a monomer mixture comprising a nonionic polymerizable unsaturated monomer having a polyoxyalkylene chain and (c) another ethylenically unsaturated monomer in the presence of a radical polymerization initiator Containing. |