Kansai Paint Company, Ltd.

Toyota Jidosha Kabushiki Kaisha

Hideaki Katsuta

Shingo Sato

Hirohisa Tsuda

Masahiro Tada

Yoshizumi Matsuno

Hideo Sugai

Takato Adachi

Fumio Yamashita

Satoru Furusawa

Yutaka Mizutani

Keitaro Yamamoto

Masaharu Ishiguro

Shuichi Okazaki

Toshiki Takenaka

Michihiro Fujita

An object achieved by the present invention is to provide a coated article having excellent appearance, corrosion resistance, weatherability, and chipping resistance obtained by a wet-on-wet coating. The present invention provides a method for forming a multilayer coating film comprising the steps of forming, on a substrate, an uncured coating film of a primer paint composition (A) containing an epoxy resin (a1) having a weight average molecular weight of 20000 or more and pigments, forming, on the uncured coating film, a top coating film of a top paint composition (B) containing an acrylic resin (b1) and the like, and simultaneously drying the films, wherein the uncured coating film of the primer paint composition (A) during application of the top paint composition (B) has a viscosity of 5 Pa&#xb7;s to 1000 Pa&#xb7;s, and the value &#x394;NV obtained by subtracting the value (NV1) of application mass solids content (%) of the primer paint composition (A) from the value (NV2) of mass solids content (%) of the uncured coating film of the primer paint composition (A) during the application of the top paint composition is 15 or more.

Method for forming multilayer coating film

The present invention provides the following method for forming a multilayer coating film. The method comprises forming an uncured coating film of a specific primer paint composition (A) on a substrate, forming a top coating film of a specific top paint composition (B) on the uncured coating film, and simultaneously drying the films. The primer paint composition (A) is a paint composition comprising an epoxy resin (a1), a rust preventive pigment (a2), a color pigment (a3), and an extender pigment (a4); and the top paint composition (B) is a paint composition comprising an acrylic resin (b1) and an active methylene blocked polyisocyanate compound (b2).

An aqueous primer composition comprising (A) a modified polyolefin aqueous dispersion, (B) an aqueous urethane resin and/or aqueous acrylic resin, (C) a conductive metal oxide and (D) aluminum flakes, characterized in that the solid mass ratio of component (A)/component (B) is in the range of 15/85-80/20, component (C) is present in a range of 50-300 parts by mass with respect to 100 parts by mass of the total resin solid portion in the composition, and component (D) is present in a range of 1-30 parts by mass with respect to 100 parts by mass of the total resin solid portion in the composition. It is possible to form high-brightness and high-chroma paint colors on plastic molded articles such as automobile bumpers, and to form primer coating films with sufficient conductivity and excellent water resistance and humidity resistance.

Aqueous primer composition and coating method using the composition

The present invention provides an aqueous intermediate coating composition comprising (A) an acrylic emulsion resin having a hydroxy value of 5 to 80 mgKOH/g and an acid value of 1 to 15 mgKOH/g, obtainable by emulsion polymerization of monomer mixture (a) comprising ethyl acrylate, a hydroxy-containing radically polymerizable unsaturated monomer and a carboxy-containing radically polymerizable unsaturated monomer, the ethyl acrylate content of the monomer mixture being 60 wt. % or more; (B) a carboxy-containing resin having a hydroxy value of more than 80 mgKOH/g but not more than 200 mgKOH/g; (C) a curing agent; and (D) a coloring pigment, and having a solids content of 60 wt. % or more. The invention also provides a method for forming a multilayer coating film using said aqueous intermediate coating composition.

Aqueous intermediate coating composition and method for forming multilayer coating film

An automobile body-used light-colored water based coating composition containing a water dispersion (A) prepared by water-dispersing a block copolymer resin (A) comprising a copolymer (a) obtained by copolymerizing a monomer component containing an olefin monomer and a copolymer (a) obtained by copolymerizing a monomer component containing a carboxyl group or carboxylic anhydride group-containing vinyl monomer, a hydroxyl group-containing resin (B), a curing agent (C) and a color pigment, a resulting coating film having a lightness L* value in accordance with a L*a*b* color system as defined in JIS Z 8729 in the range of 80 or more.

Automobile body-used light-colored water based coating composition

A water based intercoat coating composition containing (A) a polyester resin comprising, as essential components, an alicyclic polybasic acid (a) and/or an alicyclic polyhydric alcohol (a), other polybasic acid (a) and other polyhydric alcohol (a), (B) a crosslinking agent, and (C) a water based urethane resin emulsion.

Water based intercoat coating composition and multi-layer coating film-forming method by use of the same

A light-colored water based intercoat coating composition containing a hydroxyl group-containing resin (A), a curing agent (B) and a color pigment (C), a resulting coating film having a lightness index or a L value of 80 or more, the curing agent (B) being a blocked polyisocyanate curing agent (B) blocked with a pyrazole blocking agent.

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Kanagawa-ken, Japan

Hideaki Katsuta