Multilayered coating film and coated article

Patent metadata

Field	Value
Publication number	US-12264260-B2
Application number	US-202118252176-A
Country	US
Kind code	B2
Filing date	Oct 22, 2021
Priority date	Nov 13, 2020
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

A multilayer coating film includes a lustrous layer containing a luster material and a colored layer containing a reddish coloring agent, and having translucency. Regarding a Y value of an XYZ colorimetric system calibrated with a standard white plate, when a light incident angle is 45°, Y(5°) represents a Y value of reflected light measured at a light receiving angle of 5°, and Y(15°) represents a Y value of reflected light measured at a light receiving angle of 15°, the lustrous layer satisfies the following: Y(5°) is 30 or more to 700 or less; Y(15°)=k×Y(5°) (where k is a coefficient); and k is 0.01 or more to 0.3 or less. The concentration of the reddish coloring agent in the colored layer is 1 mass % or more to 17 mass % or less.

First claim

The invention claimed is:

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 coloring agent; and
a colored layer stacked on the lustrous layer, containing a reddish coloring agent, and having translucency, wherein
regarding a Y value of an XYZ colorimetric system calibrated with a standard white plate, when a light incident angle (an angle with respect to a line perpendicular to a surface of the lustrous layer) is 45°, Y (5°) represents a Y value of reflected light measured at a light receiving angle (the angle of inclination toward a light source side from a specular reflection direction) of 5°, and Y (15°) represents a Y value of reflected light measured at a light receiving angle of 15°, the lustrous layer satisfies the following:
Y (5°) is 30 or more to 700 or less;
Y (15°)=k×Y (5°) (where k is a coefficient); and
k is 0.01 or more to 0.3 or less,

a concentration of the reddish coloring agent in the colored layer is 1 mass % or more to 17 mass % or less, and
the coloring agent in the lustrous layer consists of a blackish coloring agent, a concentration of the blackish coloring agent in the lustrous layer being 1 mass % or more to 20 mass % or less.

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 concentration of the reddish coloring agent in the colored layer is 4 mass % or more to 10 mass % or less.

4. The multilayer coating film of claim 2 , wherein
the colored layer contains a reddish pigment as the reddish coloring agent, and
a slope of a tangent of a spectrum of a spectral transmittance, defined as an absolute value, of the colored layer at the wavelength of 620 nm is 0.02 nm −1 or more and 0.06 nm −1 or less, the spectral transmittance being obtainable by dividing a spectral reflectance measured for the colored layer stacked on the lustrous layer at the light receiving angle of 15° in the case of the light incident angle of 45°, by a spectral reflectance measured for the lustrous layer from which the colored layer is removed and a surface of which is therefore exposed, at the light receiving angle of 15° in the case of the light incident angle of 45°.

5. The multilayer coating film of claim 2 , wherein
the colored layer further contains a blackish coloring agent.

6. The multilayer coating film of claim 5 , wherein
a percentage of the blackish coloring agent with respect to a total of the reddish coloring agent and the blackish coloring agent is 26 mass % or less.

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

8. The multilayer coating film of claim 7 , wherein
the colored layer further contains a blackish coloring agent.

9. The multilayer coating film of claim 8 , wherein
a percentage of the blackish coloring agent with respect to a total of the reddish coloring agent and the blackish coloring agent is 26 mass % or less.

10. The multilayer coating film of claim 1 , wherein
the concentration of the reddish coloring agent in the colored layer is 4 mass % or more to 10 mass % or less.

11. The multilayer coating film of claim 1 , wherein
the colored layer contains a reddish pigment as the reddish coloring agent, and
a slope of a tangent of a spectrum of a spectral transmittance, defined as an absolute value, of the colored layer at the wavelength of 620 nm is 0.02 nm −1 or more and 0.06 nm −1 or less, the spectral transmittance being obtainable by dividing a spectral reflectance measured for the colored layer stacked on the lustrous layer at the light receiving angle of 15° in the case of the light incident angle of 45°, by a spectral reflectance measured for the lustrous layer from which the colored layer is removed and a surface of which is therefore exposed, at the light receiving angle of 15° in the case of the light incident angle of 45°.

12. The multilayer coating film of claim 11 , wherein
an average particle size of the reddish pigment is 2 nm or more to 160 nm or less.

13. The multilayer coating film of claim 12 , wherein
the slope of the tangent is 0.03 nm −1 or more to 0.06 nm −1 or less.

14. The multilayer coating film of claim 11 , wherein
the slope of the tangent is 0.03 nm −1 or more to 0.06 nm −1 or less.

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

16. The multilayer coating film of claim 15 , wherein
a concentration of the blackish coloring agent in the colored layer is 6 mass % or less.

17. The multilayer coating film of claim 16 , wherein
a percentage of the blackish coloring agent with respect to a total of the reddish coloring agent and the blackish coloring agent is 26 mass % or less.

18. The multilayer coating film of claim 15 , wherein
a percentage of the blackish coloring agent with respect to a total of the reddish coloring agent and the blackish coloring agent is 26 mass % or less.

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

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

• C09D5/035

  Coloring agents, e.g. pigments (C09D5/032 takes precedence) · CPC title

• C09D7/68

  Particle size between 100-1000 nm · CPC title

• C09D7/67

  Particle size smaller than 100 nm · CPC title

• C09D7/61

  inorganic · CPC title

• C09D7/69

  Particle size larger than 1000 nm · CPC title