Kansai Paint Company, Ltd.

Toyota Jidosha Kabushiki Kaisha

Yukihiro Ikeura

Hiroshi Kitagawa

Hironori Tonomura

Keiji Ambo

Masako Hase

Tatsuya Azuma

Yoshinori Narita

Kazuki Matsubara

Kenji Imanaka

Hiroaki Yamada

Eisuke Nishiguchi

Hiroshi Nishinaka

Gen Yokota

An aqueous coating composition for an automotive exterior, containing resin particles (A), a crosslinking agent (B), a pigment (C), and a nanocellulose (D), wherein a content of the nanocellulose (D) is 0.5 to 2.0 parts by mass in terms of solid content with respect to 100 parts by mass of a resin solid content in the coating, a solid content concentration of the coating composition is in a range from 45 to 65 mass %, and a viscosity is in a range from 350 to 1200 mPa·s. Also, an automobile coated with the aqueous coating composition, a method of forming a coating film using the aqueous coating composition, and a method of forming a multilayer coating film comprising applying the aqueous coating composition on an object, applying an aqueous second colored coating composition thereon, then applying a clearcoat coating composition thereon, and simultaneously heat-curing the compositions.

Nanocellulose-containing aqueous coating composition for automotive exterior

A method for forming a multilayer coated film on an electrodeposition-coated alloyed hot-dip galvanized steel plate include step (1) of applying an aqueous intermediate coating composition (X), step (2) of applying an aqueous base coating composition (Y), step (3) of applying a clear coating composition (Z) containing an epoxide, and step (4) of heat-curing each coated film. The coating composition (X) contains a hydroxyl group-containing acrylic resin (A), a polyurethane resin (B), a hydroxyl group-containing polyester resin (C), a melamine resin (D), and an active methylene-blocked polyisocyanate compound (E). The ratio of (A) to (B) is controlled to a specific range, and an elongation at break, Young's modulus and Tukon hardness of the coated film of the coating composition (X) are controlled to specific ranges.

Method for forming multilayer coated film

An object of the invention is to provide a method for forming a multilayer coating film with excellent smoothness, distinctness of image, and water resistance, by a 3-coat 1-bake coating method, even when preheating after the application of an aqueous first colored coating composition is omitted. The present invention provides a method for forming a multilayer coating film, including (1) applying an aqueous colored coating composition (A) to a substrate to form a colored coating film; (2) applying an effect pigment-containing aqueous coating composition (B) containing a binder component (b1), an effect pigment (b2), and a hydrophobic solvent (b3) in proportions of 15 to 30 parts by mass of effect pigment (b2) and 25 to 60 parts by mass of hydrophobic solvent (b3) relative to 100 parts by mass of the binder component (b1), to the colored coating film, without preheating the colored coating film, to form an effect coating film having a film thickness of 7 to 13 micrometers when cured; (3) applying a clear coating composition (C) to the effect coating film to form a clear coating film; and (4) heating the three coating films formed in steps (1) to (3) to simultaneously cure these three coating films.

Method for forming multilayer coating film

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Nagoya, Japan

Yukihiro Ikeura