Honda Giken Kogyo Kabushiki Kaisha

Kansai Paint Company, Ltd.

Mituru Muramoto

Tokio Suzuki

Kazuo Igarashi

Kengo Takano

Yoshiharu Komatsu

Katsunori Sato

Hirohisa Tashiro

Toshiharu Morita

Yukio Hashizume

Hiroaki Saito

The present invention provides a process for forming a multilayer film, by applying, onto a substrate, the following three coatings: (A) a coloring base coating containing a titanium white pigment and an aluminum flake and capable of forming a film having a value of N 7 to N 9 in Munsell's color system, (B) a white-pearl-like or silver-pearl-like base coating containing a scaly mica powder coated with titanium oxide, and (C) a clear coating in this order without substantially curing the resulting films of the coatings (A), (B) and (C); as necessary conducting preliminary drying at 50.degree.-100.degree. C. between the application of the coating (A) and the application of the coating (B) and/or between the application of the coating (B) and the application of the coating (C); and heating the three films to crosslink and cure them simultaneously. The multilayer film has excellent high white-iridescent appearance, color stability, etc.

Process for formation of multilayer film

The present invention provides a process for forming a multilayer film, which comprises: applying a cationic electrocoating (A) and an intermediate coating (B) in this order, followed by heat-curing, applying thereon a coloring base coating (C) capable of forming a colored film having a value of N 7 to N 9 in Munsell's color system, applying, without curing the coloring base coating (C) applied above, an iridescent base coating (D) containing a scaly mica powder coated with titanium oxide, followed by preliminary drying at 50.degree.-100.degree. C., and applying a clear coating (E), followed by heating to subject the films of the coatings (C), (D) and (E) simultaneously to crosslinking and curing, wherein the coloring base coating (C) and the iridescent base coating (D) are each a thermosetting aqueous coating containing, as vehicle components, an acrylic resin emulsion (a), a urethane resin emulsion (b) and a crosslinking agent (c). The process can form a multilayer film superior in iridescence feeling, depth feeling, smoothness, distinctness of image gloss, etc. and is suitably used for coating of, in particular, automobile body panel.

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Kanuma, Japan

Mituru Muramoto