Layered product and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10472534-B2
Application number	US-201515327340-A
Country	US
Kind code	B2
Filing date	Jul 2, 2015
Priority date	Jul 22, 2014
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

Provided is a layered product with high jet-black. A layered product according to the present invention is a layered product (10) including at least a first layer (1) and a second layer (2) that are stacked. A value of L* in a L*a*b* color system defined by JIS Z8729 of the first layer (1) is ten or less. The second layer (2) is formed on the first layer (1) and 0.1 to 1 mass % of carbon nanotubes are contained in a material constituting the second layer (2). In the L*a*b* color system defined by JIS Z8729, when values are measured from a side of a plane of the second layer (2), a value of L* is 2.5 or less, a value of a* is −2.0 or greater and 2.0 or less, and a value of b* is −2.0 or greater and 0.5 or less.

First claim

The invention claimed is:

1. A layered product comprising at least two layers, a first layer and a second layer, wherein
in a L*a*b* color system defined by JIS Z8729,
a value of L* is 2.5 or less,
a value of a* is −2.0 or greater and 2.0 or less, and
a value of b* is −2.0 or greater and 0.5 or less, when the values are measured from a side of a plane of the second layer,

the first layer contains a resin and a black pigment, and a value of L* in a L*a*b* color system defined by JIS Z8729 of the first layer is ten or less, and
the second layer is formed on the first layer and contains a resin and carbon nanotubes; an average transmittance of the second layer at a wavelength within a range of 380 to 780 nm is 5% or greater and 80% or less; and 0.1 to 1 mass % of the carbon nanotubes are contained in a material constituting the second layer.

2. The layered product according to claim 1 , wherein the second layer is formed by wet coating.

3. The layered product according to claim 1 , wherein a film thickness of the first layer is 0.5 μm or greater and 20 μm or less.

4. The layered product according to claim 1 , wherein a film thickness of the second layer is 0.5 μm or greater and 20 μm or less.

5. The layered product according to claim 1 , wherein the first layer is formed by melting and kneading.

6. The layered product according to claim 1 , wherein 1 to 20 mass % of carbon nanotubes are contained in a material constituting the first layer.

7. A method of manufacturing a layered product according to claim 1 , the layered product comprising at least two layers, a first layer and a second layer, the method comprising:
forming the first layer having a value of L* in a L*a*b color system defined by JIS Z8729 of ten or less; and
forming the second layer on the first layer by wet coating, wherein
0.1 to 1 mass % of carbon nanotubes are contained in the second layer, and
a value of L* is 2.5 or less, a value of a* is −2.0 or greater and 2.0 or less, and a value of b* is −2.0 or greater and 0.5 or less, when the values are measured from a side of a plane of the second layer.

8. The method of manufacturing the layered product according to claim 7 , wherein the first layer is formed by melting and kneading.

9. The method of manufacturing the layered product according to claim 7 , wherein an average transmittance of the second layer at a wavelength within a range of 380 to 780 nm is 5% or greater and 80% or less.

10. The method of manufacturing the layered product according to claim 7 , wherein a film thickness of the first layer is 0.5 μm or greater and 20 μm or less.

11. The method of manufacturing the layered product according to claim 7 , wherein a film thickness of the second layer is 0.5 μm or greater and 20 μm or less.

12. The method of manufacturing the layered product according to claim 7 , wherein 1 to 20 mass % of carbon nanotubes are contained in a material constituting the first layer.

13. The layered product according to claim 1 , wherein the black pigment contained in the first layer includes at least one of carbon black or carbon nanotubes.

Assignees

• Toyo Ink Sc Holdings Co Ltd
• Toyocolor Co Ltd

Inventors

• Nahata Nobuyuki
• Watanabe Katsumi
• Morita Yu
• Masuda Motoki
• Hirayama Toshiaki

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• B32B27/20

  using fillers, pigments, thixotroping agents · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• Y10S977/742

  Carbon nanotubes, CNTs · CPC title

• B32B2313/04

  Carbon · CPC title