Nissan Motor Company Limited

Shinto Paint Co., Ltd.

Nippon Paint Compnay, Ltd.

Nippon Oil Fats Co., Ltd.

Hitoshi Kimura

Tsuneo Sakauchi

Katsuya Yamamoto

Hiroyuki Kishi

Yoshinobu Tamura

Akitoshi Shirasaka

Masahide Nagaoka

Eisaku Nakatani

Shigenori Kazama

Shosaku Yamamoto

Masayuki Takemoto

Yoichi Masubuchi

Kiyoshi Taki

Shinichi Inoue

Yukihiro Manabe

Naoya Sakai

Nagaoka

Yasuyu Tsuchiya

Masaya Kawabata

Makoto Efumi

Michiaki Wake

A composite paint for an automotive outer panel comprises an electrodeposition paint film coated on the surface of a steel sheet. The electrodeposition paint film has a minimum melt viscosity not less than 0.2 during hardening and consists essentially of a water paint composition in an amount ranging from 50 to 85 parts by weight upon conversion to a solid content, and a partially cross-linked resin in an amount ranging from 15 to 50 parts by weight upon conversion to a solid content. Additionally, an intermediate paint film is coated on the electrodeposition paint film and has a hardening starting time ranging from 15 to 20 minutes.

Composite paint

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

A paint film arrangement formed on an outer panel of an automotive vehicle. The paint film arrangement comprises a film of an electrodeposition paint formed on the surface of a steel plate of the automotive vehicle outer panel. The surface of the electrodeposition paint film has a center line average height Ra within a range of 0.3.mu..ltoreq.Ra.ltoreq.0.8.mu.. The total of values of power spectrum of the surface of the electrodeposition paint film is not more than 80 .mu.V.sup.2 within a wavelength range not more than 0.5 mm. Additionally, a film of an intermediate coat paint is formed on the surface of the electrodeposition paint film. The intermediate coat paint has a hardening starting time ranging from 15 to 20 minutes. The hardening starting time is determined according to a logarithmic decrement of the intermediate coat paint by an oscillated pendulum type viscoelasticity measuring device.

Paint film arrangement

A composite paint film formed on a steel sheet of an automotive vehicle body. The composite paint film comprises an electrodeposition paint film (I) coated on the steel sheet, and an intermediate coat paint film (II) coated on the first paint film. The electrodeposition paint film is formed of an epoxy-based cationic electrodeposition paint composition and has a minimum melt viscosity not less than 0.2 during hardening. The epoxy-based cationic electrodeposition paint composition includes an amine-added epoxy resin (1) of the type which may be hardened with a blocked isocyanate, a colloidal silica-containing gelled particulate (2), and an alkyltin ester compound of a liquid aliphatic carboxylic acid. The above-mentioned colloidal silica-containing gelled particulate is formed by dispersing a mixture of an acrylic copolymer having a hydrolizable alkoxysilane group and a cationic group and a cationic acidic colloidal silica in water to carry out a cross-linking reaction in particles of the colloidal silica. The second paint film (II) has a hardening starting time ranging from 15 to 20 minutes.

Composite paint film

A paint composition for cation electrodeposition painting, used for painting automotive vehicle body etc. The paint composition comprises basic unsaturated modified epoxy ester expressed by the general formula: ##STR1## where R.sub.1 and R.sub.2 are functional groups at least one of which is .alpha., .beta.-ethylenic double bond containing groups and the remainder is an unsaturated fatty acid chain; R.sub.3 is a group expressed by the formula: ##STR2## and X and Y are functional groups whose total number is n+1 in which not less than one functional group is a group containing both a tertiary amine function and a urethane function, and the remainder are hydroxyl groups (--OH), n being an integer ranging from 1 to 20. The paint composition further comprises basic unsaturated modified polydiene compound which is a reaction product of polydiene compound having a molecular weight ranging from 500 to 10,000 and unsaturated double bonds with iodine value ranging from 50 to 500, and containing oxirane oxygen ranging from 3 to 12% by weight, (2) a secondary amine, and .alpha., .beta.-ethylenic unsaturated carboxylic acid, thereby improving ability for covering the edge of a metal member to be painted.

Paint composition for cation electrodeposition painting

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Chigasaki, Japan

Hitoshi Kimura