Toyota Jidosha Kabushiki Kaisha

Kansai Paint Company, Ltd.

Nippon Paint Automotive Coatings Co., Ltd

Toagosei Company, Ltd.

Keiji Ambo

Shuji Yomo

Masako Hase

Eiichi Okazaki

Atsuo Nabeshima

Kanji Mori

Mamoru Kouzaki

Yoshinori Narita

Kazuki Matsubara

Hiroshi Mitsuishi

Katsunori Ito

Hironori Tonomura

Kazuhide Sato

Hiroshi Murata

Yukihiro Ikeura

Takayuki Ono

Yoshinari Matsuura

Akira Yamazaki

Yoshiaki Ukai

Katsunobu Mochizuki

Katsuhiko Sugimoto

Nobuaki Koike

Akiyo Tsukamoto

Shinya Kanbe

Kazuki Ofusa

Takayuki Kawabata

Hiroshi Nishinaka

The present invention provides an electron beam curable coating composition comprising: an electron beam curable component (A) which contains 10% by mass or more of a multifunctional (meth)acrylate; and a room temperature curable component (B) which contains 1 to 15% by mass of an isocyanate group and is not cured by electron beam irradiation, wherein a solid content mass ratio of the component (B) to a total amount of the components (A) and (B) is 20 to 55% by mass.

Electron beam curable coating composition

An object of the present invention is to provide a method for producing a coated material by using a composition that can be spray-coated, and that does not run downward after coating (i.e., rheology controllable). The method for producing a coated material includes step (1) of applying an electron beam-curable composition containing an ethylenically unsaturated group-containing compound to a substrate to form a coating film that has a surface viscosity of 1 Pa&#xb7;s to 300 Pa&#xb7;s as measured based on an electric-field pickup method, step (2) of drying the coating film obtained in step (1) to form a dry coating film when the electron beam-curable composition contains a volatile component, and step (3) of irradiating the substrate that has the coating film obtained in step (1) or the dry coating film obtained in step (2) with electron beams in an inert gas atmosphere to form a cured coating film.

Method for producing coated material by using electron beam-curable composition

A method for forming a multilayer coating film which includes forming an uncured coating film by applying a first aqueous base coating composition, forming an uncured coating film by applying a second aqueous base coating composition, forming an uncured coating film by applying a clear coating composition, and simultaneously heat curing the obtained coating films. The first aqueous base coating composition contains a carbodiimide compound, the clear coating composition contains a hydroxyl group-containing acrylic resin (A) having a hydroxyl value of 120 to 160 mgKOH/g and an acid value of 5 to 10 mgKOH/g, a polyisocyanate compound (B), and a polycarbonate diol compound (C). The component (A) has a hydroxyl group-containing alkyl moiety having 3 or less carbon atoms, and the ratio of the numbers of moles of the isocyanate functional groups of the component (B) and the hydroxyl group functional groups of the component (A) is 1.15 to 1.35.

Method for forming multilayer coating film

Provided is a method of applying an electron beam curable aqueous coating material, including coating a surface of a material to be coated with the electron beam curable aqueous coating material to form a wet coating film; drying the wet coating film until a time integration value of a reciprocal of an average value of viscosities of a region from a surface of the wet coating film to a depth of one half a film thickness of the wet coating film is in a range of 0.30 (Pa&#xb7;s)&#xb7;min to 0.90 (Pa&#xb7;s)&#xb7;min, which is acquired by an electric field pick-up method, and a solid content concentration of the wet coating film is 90% by mass or greater; and curing the obtained dry coating film by irradiation with an electron beam after the wet coating film is dried.

Method of applying electron beam curable aqueous coating material

A method for forming a multilayer coated film includes step (1) of applying an aqueous intermediate coating composition (A), step (2) of applying an aqueous base coating composition (B), step (3) of applying a clear coating composition (C), and step (4) of heat-curing the coated films. The coating composition (A) contains a specific hydroxyl group-containing acrylic resin (a1), a specific polyurethane resin (a2), a specific hydroxyl group-containing polyester resin (a3), a melamine resin (a4), and an active methylene-blocked polyisocyanate compound (a5). A ratio of the resin (a1) to the resin (a2) falls within a specific range. The heat-cured coated film of the coating composition (A) has a specific elongation at break, Young's modulus and Tukon hardness. The coating composition (C) contains a hydroxyl group-containing acrylic resin (c1) and an allophanate group-containing polyisocyanate compound (c2).

Method for forming multilayer coated film

A water-based coating composition including: a polyol; a polyisocyanate; a hydrophobic curing catalyst which is made of an organometallic compound containing at least one metal atom selected from the group consisting of Sn, Bi, Zr, Ti, and Al and of which solubility in water under conditions of atmospheric pressure at 20&#xb0; C. is 1 g/100 ml or less; and a nonionic surfactant of which an HLB value determined by a Griffin method is 10 to 15.

Water-based coating composition and production method of the same

The coating film formed on an automobile body has softness during a film formation even on a thermally expandable/shrinkable base, and the cured film has an excellent appearance. Provided is a method for forming a multilayer coating film, the method comprises: applying an aqueous intermediate coating composition and preheating the applied composition at 60 to 90&#xb0; C. to form an uncured film; preheating to form an uncured base coating film and a clear coating film; and baking and curing these uncured films to form a multilayer coating film, wherein the aqueous intermediate coating composition comprises (a) an acrylic resin emulsion having a specific properties, and (b) a film formation auxiliary agent that is a fatty acid diester compound having a boiling point of 280&#xb0; C. to 350&#xb0; C., and a cured film comprising (a) and (b) at a mass ratio of 3:1 has a rupture elongation of 1% or more.

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.

A method for forming a multilayer coated film on an object includes steps (1) to (3) below. A first colored coating material is applied to the object, thereby forming a first colored coated film (step (1)). The first colored coating material includes an iron-oxide-coated aluminum pigment and a quinacridone pigment and has a light reflectance property at specific wavelengths. A second colored coating material is applied to the first colored coated film, thereby forming a second colored coated film (step (2)). The second colored coating material includes a perylene pigment and has a specific hue. A clear coating material is applied to the second colored coated film (step (3)). A color difference &#x394;E between the first colored coated film and the multilayer coated film is in a range of 20 to 30.

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Miyoshi, Japan

Keiji Ambo