To obtain an aqueous intermediate coating material composition which has good undercoat opacifying properties.
This aqueous intermediate coating material composition comprises a carboxyl group-containing aqueous polyester resin and a melamine resin, and the melamine resin has a degree of polymerization of ≤2.5 and, simultaneously, a ratio of a mononuclear unit of ≥50%, and the reactive group of the melamine resin is of the complete alkyl type, and the above carboxyl group-containing aqueous polyester resin has a weight average molecular weight of 5,000-15,000. Herein, the degree of polymerization of the melamine resin is preferably ≤1.5. Further, the glass transition temperature of the above carboxyl group-containing aqueous polyester resin is preferably -40 to 50°C, more preferably -40 to 10°C.
YAMADA MAKI
TAKEUCHI YUTAKA
Next Patent: MAGNETIC COATING MATERIAL