Patent ID: 7858153

Claim:
A powder primer composition comprising: (A) a carboxyl group-containing polyester resin; (B1) a bisphenol A-type epoxy resin with an epoxy equivalent of 400-2000 g/eq; (C1) a bisphenol F-type epoxy resin with an epoxy equivalent of 400-2000 g/eq; (D) a phosphoric acid-modified epoxy resin; and (E) a hydroxyl group-containing polymer; wherein: the powder primer composition has a ratio of components (B1) to (C1) of 25/75-75/25 based on the solid weight of both components; the phosphoric acid-modified epoxy resin (D) is obtained by reacting (c) a phosphoric acid ester compound with at least one P—OH bond in the molecule, obtained by reacting a monoglycidyl ether compound and/or monoglycidyl ester compound with phosphoric acid, and (d) an epoxy compound with at least one epoxy group in the molecule; the hydroxyl group-containing polymer (E) is a polymer of hydroxyl group-containing radical polymerizing unsaturated monomers or copolymers of these monomers with other radical polymerizing unsaturated monomers; and the content of the hydroxyl group-containing polymer (E) is 0.1-20 parts by mass with respect to 100 parts by mass of the total solid content including the polyester resin (A), epoxy resin (B1), epoxy resin (C1) and phosphoric acid-modified epoxy resin (D).