Nissan Motor Company Limited

Taikisha Ltd.

Nippon Paint Compnay, Ltd.

Nippon Oil Fats Co., Ltd.

Shinto Paint Co., Ltd.

Yoshinobu Tamura

Katsuya Yamamoto

Tsuneo Sakauchi

Hitoshi Kimura

Hiroyuki Kishi

Masahide Nagaoka

Eisaku Nakatani

Shosaku Yamamoto

Masayuki Takemoto

Yoichi Masubuchi

Shinichi Inoue

Akitoshi Shirasaka

Naoya Sakai

Nagaoka

Yasuyu Tsuchiya

Masaya Kawabata

Makoto Efumi

Michiaki Wake

Provided is an electrostatic coating method using a conductor such as a metal or a conductive resin as a coating target surface, the method including coating the coating target surfacewith a charged paint by ejecting the charged paint from a spray gunin a state where generation of an electrostatic field between a spray gunand the coating target surfaceis prevented and generation of free ions is prevented.

Electrostatic coating method and gun for electrostatic coating

In a first coating step, low electrical conductivity is imparted to a coating surfaceof a non-electrically conductive coating objectand a first paint film is formed by applying a charged first paint to the coating surfacewith free ions being suppressed. In a second coating step, a second paint film is formed by applying a negatively-charged second paint to a surface of the first paint film with free ions being suppressed, before the first paint film dries.

Electrostatic coating method

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 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

Growing community of inventors

Sagamihara, Japan

Yoshinobu Tamura