Kansai Paint Company, Ltd.

Haruyuki Gontani

Naoto Yanagidate

Fumio Yamashita

Shoichi Shinkoda

Toru Iwamoto

Masashi Kanda

Takashi Iwai

Natsuko Nakano

Provided is a method for forming a multilayer coating film that is capable of forming a multilayer coating film that has pearly luster with excellent blackness and high reflectance of an infrared laser. The method for forming a multilayer coating film includes applying a carbon black pigment-containing first colored paint (X) to form a first colored coating film; applying a second colored paint (Y) containing a pigment (A) that is a transparent or translucent base material coated with a metal oxide to form a second colored coating film; applying a clear paint (Z) to form a clear coating film; and heating the first colored coating film, the second colored coating film, and the clear coating film separately or simultaneously to cure these films, wherein the first colored coating film has a lightness L*(45&#xb0;) of less than 20, the multilayer coating film has a lightness L*(45&#xb0;) of less than 20, and the multilayer coating film has a diffuse reflectance of 10% or more at a wavelength of 905 nm.

Method for forming multilayer coating film

A thermosetting coating composition includes a hydroxyl group-containing resin (A), a blocked polyisocyanate curing agent (B), and an amine compound (C) represented by the formula (1). In the formula (1), Rto Reach independently represents a hydrogen atom or an organic group having one or more carbon atoms. The organic group may contain one or more atoms selected from the group consisting of oxygen atoms, nitrogen atoms, sulfur atoms, and halogen atoms. 

Thermosetting coating composition

This invention provides a method for forming a multilayer coating film that is capable of forming a multilayer coating film that has excellent blackness, high reflectance of an infrared laser, and excellent coating film performance. The method for forming a multilayer coating film includes forming a first colored coating film containing a titanium oxide pigment and in which the diffuse reflectance at a wavelength of 905 nm or diffuse reflectance at a wavelength of 1550 nm, or both, is 40% or more; forming a second colored coating film containing a carbon black pigment (A) and one or more pigments (B), which are a perylene black pigment (B1) or two or more pigments (B2) selected from the group consisting of blue pigments, red pigments, yellow pigments, and green pigments, or both (B1) and (B2); and forming a clear coating film; wherein the multilayer coating film has a lightness L*(45&#xb0;) of 4 or less and a chroma C*(45&#xb0;) of 2 or less, and wherein the diffuse reflectance at a wavelength of 905 nm or the diffuse reflectance at a wavelength of 1550 nm, or both, is 10% or more.

This invention provides a method for forming a multilayer coating film, the method comprising forming a multilayer coating film that has excellent blackness, high reflectance of an infrared laser, and excellent coating film performance. The method for forming a multilayer coating film includes forming a first colored coating film containing a titanium oxide pigment, in which the diffuse reflectance at a wavelength of 905 nm or diffuse reflectance at a wavelength of 1550 nm, or both, is 40% or more; forming a second colored coating film containing at least one pigment selected from the group consisting of (A1) a perylene black pigment, (A2) a black metal oxide complex pigment, and (A3) two or more pigments selected from the group consisting of blue pigments, red pigments, yellow pigments, and green pigments; forming a third colored coating film containing a carbon black pigment; and forming a clear coating film; wherein the multilayer coating film has a lightness L*(45&#xb0;) of 3 or less and a chroma C*(45&#xb0;) of 1 or less, and wherein the diffuse reflectance at a wavelength of 905 nm or the diffuse reflectance at a wavelength of 1550 nm of the multilayer coating film, or both, is 10% or more.

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Kanagawa, Japan

Haruyuki Gontani