Sekisui Kagaku Kogyo Kabushiki Kaisha

Seikisui Kagaku Kogyo Kabushiki Ltd.

Naofumi Imahigashi

Minoru Takahashi

Osamu Ishii

Masanori Naito

Yoshinobu Kusuhara

Toshimi Inai

Koji Motoi

Koichi Karukaya

An undercoat composition for a powder coating of a heat-resistant resin on a metal substrate at a high coating temperature wherein the composition includes a specific imide prepolymer.

Undercoat composition

A primer coating composition comprising (1) a mixture of more than 50% by weight of aluminum powder and less than 50% by weight of zinc powder, and (2) at least one C.sub.1-4 -alkyl silicate, the weight ratio of (1) to (2) being 60:40 to 95:5. The composition is employed in a coating method which comprises applying a primer dispersion to the surface of a substrate to be coated. The primer disbersion is a dispersion of a mixture of more than 50% by weight of aluminum powder and less than 50% by weight of zinc powder in a solution of at least one organic solvent-soluble C.sub.1-4 -alkyl silicate in an organic solvent. The weight ratio of the metal powder to the alkyl silicate is as indicated. The coating is baked and a finishing powder paint is coated on the resulting primer. The finished coating is then baked.

Coating method and article produced thereby

A primer coating composition comprising (1) a mixture of more than 50% by weight of aluminum powder and less than 50% by weight of zinc powder, and (2) at least one C.sub.1-4 -alkyl silicate, the weight ratio of (1) to (2) being 60:40 to 95:5. The composition is especially useful as a primer for polyphenylene sulfide resin paints.

Primer composition and coating method using said composition

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Takatsuki, Japan

Naofumi Imahigashi