Other

Nippon Paint Compnay, Ltd.

Kazuyoshi Uemura

Shinji Seo

Masayuki Yamaguchi

Yukihide Yamashita

Hiroshi Oda

Norihiko Sudo

Disclosed is a powder paint composition that can form coating film having high corrosion resistance and excellent appearance even on a metal substrate surface containing non-flat portions and a process for forming multi-layer coats excellent both in corrosion resistance and top-coat adhesion using the powder paint composition. The powder paint composition comprises a) 30-55 parts by weight of a polyester resin having a hydroxyl value of 50-150, b) 1-20 parts by weight of a hydroxyl group-containing acrylic resin having a hydroxyl value of 30-150, c) 1-15 parts by weight of an epoxy resin, and d) 10-30 parts by weight of a urethodione ring-containing compound, based on 100 parts by weight of solid contents in the powder paint composition, the powder paint composition having an average particle size of 5-40 &mgr;m.

Powder paint composition and process for forming multi-layer coats containing the coat thereof

This invention relates to a method for forming a coating film which comprises applying an epoxy resin powder coating (A) onto a substrate by electrostatic coating, half-baking the resultant uncured coat, applying a polyester resin powder coating (B) onto the half-baked coat by electrostatic coating, and baking the two uncured coats simultaneously, wherein the epoxy resin powder coating (A) and the polyester resin powder coating (B) is such that the gel time ratio [epoxy resin powder coating (A)]/[polyester resin powder coating (B)] at 180.degree. C. is 1/1 through 1/5, the gel time of the epoxy resin powder coating (A) at 180.degree. C. is 40 to 400 seconds, and the gel time of the polyester resin powder coating (B) at 180.degree. C. is not over 500 seconds.

Electrostatic coating method and coating film

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Neyagawa, Japan

Kazuyoshi Uemura