Toyota Jidosha Kabushiki Kaisha

Nippon Paint Automotive Coatings Co., Ltd

Nippon Paint Compnay, Ltd.

Katsuhiko Sugimoto

Keiji Ambo

Masako Hase

Hideaki Tsujioka

Hiroshi Mitsuishi

Daisuke Segawa

Go Suzuki

Takuya Miura

A method for forming a multilayer coating film which includes forming an uncured coating film by applying a first aqueous base coating composition, forming an uncured coating film by applying a second aqueous base coating composition, forming an uncured coating film by applying a clear coating composition, and simultaneously heat curing the obtained coating films. The first aqueous base coating composition contains a carbodiimide compound, the clear coating composition contains a hydroxyl group-containing acrylic resin (A) having a hydroxyl value of 120 to 160 mgKOH/g and an acid value of 5 to 10 mgKOH/g, a polyisocyanate compound (B), and a polycarbonate diol compound (C). The component (A) has a hydroxyl group-containing alkyl moiety having 3 or less carbon atoms, and the ratio of the numbers of moles of the isocyanate functional groups of the component (B) and the hydroxyl group functional groups of the component (A) is 1.15 to 1.35.

Method for forming multilayer coating film

Growing community of inventors

Hirakata, Japan

Katsuhiko Sugimoto