Nissan Motor Company Limited

Nippon Oil Fats Co., Ltd.

Shinto Paint Co., Ltd.

Michiaki Wake

Shosaku Yamamoto

Masayuki Takemoto

Katsuya Yamamoto

Tsuneo Sakauchi

Yoshinobu Tamura

Hitoshi Kimura

Hiroyuki Kishi

Shinichi Inoue

Akitoshi Shirasaka

Naoya Sakai

Masahide Nagaoka

Masaya Kawabata

Makoto Efumi

A composite paint film coating formed on a steel sheet of an automotive vehicle body. The composite paint film coating is comprised of an electrodeposition paint film (I) coated on the steel sheet, and an intermediate paint film (II) coated on the first paint film. The electrodeposition paint film has a minimum melt viscosity not less than 0.2 during hardening. The electrodepositon paint film is formed of cathodic electrodeposition paint composition which includes a cationic thermosetting resin (1), and an already cross-linked particulate resin (2). The particlate resin is an addition-polymer formed between a fist compound (A) having at least two primary amino groups in a molecule, and a second compound (B) having at least two .alpha.,.beta.-ethylenic unsaturated groups. The particulate resin has an average particle size ranging from 0.01 to 1 .mu.m. The weight ratio ((2)/(1)) in solid content between the particulate resin (2) cationic thermosetting resin (1) is within a range from 0.03 to 0.15. The intermediate paint film (II) has hardening starting time ranging from 5 to 20 minutes.

Composite paint film coating

Growing community of inventors

Chigasaki, Japan

Michiaki Wake