Light diffusion reflecting plate

Patent metadata

Field	Value
Publication number	US-9696465-B2
Application number	US-201314402391-A
Country	US
Kind code	B2
Filing date	May 22, 2013
Priority date	May 22, 2012
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A light diffusion reflecting plate having a high degree of whiteness and excellent light diffusion properties and antiglare properties includes a substrate having thereon at least a ground coat layer and a top coat layer in contact with this ground coat layer. The ground coat layer is a white coating film layer. The top coat layer contains a white pigment from 2 to 15% by mass and two kinds of spherical particles, i.e., (A) a spherical particle having an average particle size of from 5 to 30 μm and (B) a spherical particle having an average particle size of from 15 to 45 μm, each of which is contained in an amount of from 5 to 17% by mass. A difference in the average particle size between the spherical particle (A) and the spherical particle (B) is 10 μm or more.

First claim

The invention claimed is:

1. A light diffusion reflecting plate comprising a substrate having thereon at least a ground coat layer and a top coat layer in contact with this ground coat layer, wherein the ground coat layer is a white coating film layer; the top coat layer contains a white pigment and two kinds of spherical particles; a content of the white pigment in the top coat layer is from 2 to 15% by mass; the two kinds of spherical particles are (A) a spherical particle having an average particle size of from 5 to 30 μm and (B) a spherical particle having an average particle size of from 15 to 45 μm; a difference in the average particle size between the spherical particle (A) and the spherical particle (B) is 10 μm or more; and each of the spherical particle (A) and the spherical particle (B) is contained in an amount of from 5 to 17% by mass in the top coat layer,
wherein the light diffusion reflecting plate has a 60-Degree specular gloss value of 7.4 or less.

2. The light diffusion reflecting plate according to claim 1 , wherein a thickness of the ground coat layer is from 15 to 45 μm.

3. The light diffusion reflecting plate according to claim 2 , wherein the thickness of the ground coat layer is more than 30 μm and less than 45 μm.

4. The light diffusion reflecting plate according to claim 1 , wherein the spherical particles are a resin bead.

5. The light diffusion reflecting plate according to claim 1 , wherein a thickness of the top coat layer is from 15 to 30 μm.

6. The light diffusion reflecting plate according to claim 1 , wherein the substrate is a metal sheet.

7. The light diffusion reflecting plate according to claim 1 , wherein a primer layer is further provided between the substrate and the ground coat layer.

8. The light diffusion reflecting plate according to claim 1 , wherein the ground coat layer comprises white pigment in an amount in the range of from 30 to 60% by mass relative to the whole amount of solids of the ground coat layer.

9. The light diffusion reflecting plate according to claim 1 , wherein the ground coat layer comprises white pigment in an amount in the range of from 45 to 55% by mass relative to the whole amount of solids of the ground coat layer.

10. The light diffusion reflecting plate according to claim 1 , wherein the light diffusion reflecting plate has a 20-Degree specular gloss value of 2.2 or less.

Assignees

• Miyake Katsuhiro
• Echigo Takuya
• Kano Toshihiro
• Dainippon Printing Co Ltd

Inventors

• Miyake Katsuhiro
• Echigo Takuya
• Kano Toshihiro

Classifications

• G02B5/0284 Primary

  used in reflection · CPC title

• G02B5/0242 Primary

  by means of dispersed particles · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title

• G02B5/0294

  adapted to provide an additional optical effect, e.g. anti-reflection or filter · CPC title

• G02F1/11

  based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves (acousto-optical deflection G02F1/33) · CPC title