Multilayered coating film and coated article

Patent metadata

Field	Value
Publication number	US-2024018319-A1
Application number	US-202118251735-A
Country	US
Kind code	A1
Filing date	Oct 22, 2021
Priority date	Nov 13, 2020
Publication date	Jan 18, 2024
Grant date	—

Abstract

A multilayer coating film includes a lustrous layer containing a luster material, and a colored layer stacked on the lustrous layer, containing a reddish coloring agent, and having translucency. For the lustrous layer, when a light incident angle (an angle with respect to a line perpendicular to the surface of the lustrous layer) is 45° and L*(θ) represents the L* value of the lightness index of reflected light measured at a light receiving angle (the angle of inclination toward a light source side from a specular reflection direction) θ, L*(θ) at 45°≤θ≤80° and 100°≤θ≤110° is 10 or less, and when the luster material is projected onto the bottom surface of the lustrous layer, the percentage of the projected area of the luster material on the bottom surface is 3% or more to 70% or less per unit area.

First claim

1 . A multilayer coating film comprising:
a lustrous layer directly or indirectly formed on a surface of a coating target and containing a luster material; and a colored layer stacked on the lustrous layer, containing a reddish coloring agent, and having translucency, wherein for the lustrous layer, when a light incident angle (an angle with respect to a line perpendicular to the surface of the lustrous layer) is 45° and L*(θ) represents the L*value of the lightness index of reflected light measured at a light receiving angle (the angle of inclination toward a light source side from a specular reflection direction) θ, L*(θ) at 45°≤θ≤80° and 100°≤θ≤110° is 10 or less, and when the luster material is projected onto a bottom surface of the lustrous layer, a percentage of a projected area of the luster material on the bottom surface is 3% or more to 70% or less per unit area.

2 . The multilayer coating film of claim 1 , wherein
the lustrous layer contains, as the luster material, aluminum flakes having an average particle size of 5 μm or more to 30 μm or less and an average thickness of 10 nm or more to 500 nm or less, and a concentration of the aluminum flakes in the lustrous layer is 1 mass % or more to 17 mass % or less.

3 . The multilayer coating film of claim 2 , wherein
the aluminum flakes have a surface roughness Ra of 50 nm or less.

4 . The multilayer coating film of claim 1 , wherein
the percentage of the projected area of the luster material is 20% or more to 50% or less per unit area.

5 . The multilayer coating film of claim 1 , wherein
the lustrous layer contains a blackish coloring agent.

6 . The multilayer coating film of claim 5 , wherein
the blackish coloring agent contained in the lustrous layer is carbon black.

7 . The multilayer coating film of claim 6 , wherein
a concentration of the carbon black in the lustrous layer is 1 mass % or more to 20 mass % or less.

8 . The multilayer coating film of claim 6 , wherein
an average particle size of the carbon black is 200 nm or less.

9 . The multilayer coating film of claim 1 , wherein
a spectral reflectance, which is measured at a light incident angle of 45° and a light receiving angle of 45° and 110°, of the lustrous layer for a standard white plate in a wavelength range of 450 nm to 700 nm is 0.02 or less in terms of an absolute value.

10 . The multilayer coating film of claim 1 , wherein
the reddish coloring agent in the colored layer is a reddish pigment.

11 . The multilayer coating film of claim 1 , wherein
the concentration of the reddish coloring agent in the colored layer is 1 mass % or more to 17 mass % or less.

12 . The multilayer coating film of claim 1 , wherein
the colored layer further contains a blackish coloring agent.

13 . The multilayer coating film of claim 12 , wherein
a concentration of the blackish coloring agent in the colored layer is 6 mass % or less.

14 . The multilayer coating film of claim 12 , wherein
a percentage of the blackish coloring agent with respect to a total of the reddish coloring agent and the blackish coloring agent in the colored layer is 26 mass % or less.

15 . A coated article comprising: the multilayer coating film of claim 1 .

16 . The multilayer coating film of claim 2 , wherein
the percentage of the projected area of the luster material is 20% or more to 50% or less per unit area.

17 . The multilayer coating film of claim 2 , wherein
the lustrous layer contains a blackish coloring agent.

18 . The multilayer coating film of claim 2 , wherein
a spectral reflectance, which is measured at a light incident angle of 45° and a light receiving angle of 45° and 110°, of the lustrous layer for a standard white plate in a wavelength range of 450 nm to 700 nm is 0.02 or less in terms of an absolute value.

19 . The multilayer coating film of claim 2 , wherein
the concentration of the reddish coloring agent in the colored layer is 1 mass % or more to 17 mass % or less.

20 . A coated article comprising: the multilayer coating film of claim 2 .

Assignees

• Mazda Motor

Inventors

• Yamane Takakazu
• Okamoto Keiichi
• Teramoto Kouji
• Nonaka Ryuji
• TAMAI Kazuteru
• Kawase Eiichi
• Fujimoto Tomohiro
• Nakamoto Takayoshi

Classifications

• C08J7/042 Primary

  with two or more layers, where at least one layer of a composition contains a polymer binder · CPC title

• C09D5/36

  Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre · CPC title

• C09D7/41 Primary

  Organic pigments; Organic dyes · CPC title

• C09D7/61

  inorganic · CPC title

• C09D7/67

  Particle size smaller than 100 nm · CPC title