Kansai Paint Company, Ltd.

Toyota Jidosha Kabushiki Kaisha

Munehiro Nakata

Hiroshi Kitagawa

Daisuke Takayama

Tatsuya Azuma

Mika Yoneyama

In a method for forming a multilayer coated film including an intermediate coated film, a base coated film, a clear coated film and an adhesive layer, an intermediate coating composition (X) contains a hydroxyl group-containing polyester resin (A), a melamine resin (B), a pyrazole-blocked polyisocyanate compound (C), a pigment (D), and an organic solvent (E), a content ratio (B/C) is from 5/35 to 20/15 in terms of solid content ratio, and a concentration (PWC) of the pigment (D) is from 40% to 60%. The cured intermediate coated film has, at 20&#xb0; C., an elongation at break of 40% to 90%, a Young's modulus of 600 MPa to 1,600 MPa, and a Tukon hardness of 3 to 9.

Method for forming multilayer coated film

An object of the present invention is to provide an aqueous coating composition with excellent finished appearance and removability in bell cleaning, and a method for forming a multilayer coating film having excellent smoothness by a 3-coat-1-bake method including successively applying an aqueous first colored coating composition, an aqueous second colored coating composition, and a clear coating composition to a substrate, and heat-curing the resulting three layers of the multilayer coating film all at once. The present invention provides an aqueous coating composition containing an acrylic resin (A), a curing agent (B), and a urethane resin emulsion (C) with a weight average molecular weight of 2,000 to 50,000, the urethane resin emulsion (C) being prepared using constituent components containing a polyisocyanate component and a polyol component as starting materials, wherein the polyisocyanate component contains an alicyclic diisocyanate, and the polyol component contains a polycarbonate diol in an amount of 50 mass %, based on the total amount of the polyol component.

Water-based coating composition and method of forming multilayered coating film

An object to be achieved by the present invention is to provide a method capable of forming a multilayer coating film having excellent smoothness, distinctness of image, and chipping resistance, by a 3-coat 1-bake process comprising successively applying an aqueous first colored coating composition, an aqueous second colored coating composition, and a clear coating composition to a substrate, and heat-curing the resulting three layers of the multilayer coating film all at once. The present invention provides a method for forming a multilayer coating film, which employs a 3-coat 1-bake process comprising sequentially applying an aqueous first colored coating composition (X), an aqueous second colored coating composition (Y), and a clear coating composition (Z) on a substrate; and heat-curing the resulting three layers of the multilayer coating film all at once, wherein the aqueous first colored coating composition (X) contains an acrylic resin (A), a curing agent (B), and a urethane resin emulsion (C), and a first colored coating film formed from the aqueous first colored coating composition (X) has a water swelling rate of 100% or less and an organic solvent swelling rate of 300% or less.

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Hiratsuka, Japan

Munehiro Nakata