Anti-glare film, polarizer and image display device

Patent metadata

Field	Value
Publication number	US-10254444-B2
Application number	US-201214234310-A
Country	US
Kind code	B2
Filing date	Jul 25, 2012
Priority date	Jul 26, 2011
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

The claimed invention provides an anti-glare film which has high pencil hardness and high scratch resistance along with crack prevention, and also has high image contrast and excellent anti-glare property. Provided is an anti-glare film including a light transmitting substrate, and an anti-glare layer having surface roughness on at least one surface of the light transmitting substrate. The anti-glare layer includes chain-like inorganic fine particles which have an area ratio of 30 to 94% in the thickness direction cross section of the anti-glare layer.

First claim

The invention claimed is:

1. An anti-glare film, comprising:
a light transmitting substrate; and
an anti-glare layer with surface roughness on at least one surface of the light transmitting substrate, the anti-glare layer having a film thickness of 3 to 10 μm,
the anti-glare layer comprising a binder resin, an organic filler, and chain-like inorganic fine particles dispersed in the binder resin, the chain-like inorganic fine particles occupying an area ratio of 30 to 94% of a thickness direction cross section of the anti-glare layer,
the chain-like inorganic fine particles being made of 3 to 20 spherical inorganic fine particles having an average primary particle size of 1 nm to 100 nm, the 3 to 20 spherical inorganic fine particles being connected together to form a chain,
the organic filler being selected from the group consisting of polystyrene beads, benzoguanamine-melamine-formaldehyde condensates, styrene-acrylic copolymer beads, benzoguanamine-formaldehyde condensate beads, melamine-formaldehyde condensates, polycarbonate beads, and polyethylene beads.

2. The anti-glare film according to claim 1 ,
wherein the area ratio of the chain-like inorganic fine particles in the thickness direction cross section of the anti-glare layer is 40 to 80%.

3. The anti-glare film according to claim 1 ,
wherein the chain-like inorganic fine particles have a filling rate of 40 to 150% in the anti-glare layer.

4. The anti-glare film according to claim 1 ,
wherein the chain-like inorganic fine particles have the average primary particle size of 1 to 90 nm.

5. The anti-glare film according to claim 1 ,
wherein the chain-like inorganic fine particles are chain-like silica.

6. The anti-glare film according to claim 1 ,
wherein the anti-glare layer is a single layer.

7. The anti-glare film according to claim 1 ,
wherein the anti-glare layer further comprises an inorganic filler, and
the organic filler and the inorganic filler are present in an amount of 5 to 25% by mass.

8. The anti-glare film according to claim 7 ,
wherein the organic filler is at least one selected from the group consisting of styrene-acrylic copolymer beads and polystyrene beads.

9. A polarizer comprising
a polarizing element, and
the anti-glare film according to claim 1 , on a surface of the polarizing element.

10. An image display device comprising:
the anti-glare film according to claim 1 , or
a polarizer comprising a polarizing element and the anti-glare film according to claim 1 on a surface of the polarizing element.

11. The anti-glare film according to claim 1 ,
wherein the organic filler has an average particle size of 1 to 10 μm.

12. The anti-glare film according to claim 1 ,
wherein the organic filler has a refractive index of 1.50 or more.

13. An anti-glare film, comprising:
a light transmitting substrate having a surface; and
an anti-glare layer disposed on the surface of the light transmitting substrate, wherein the anti-glare layer has a thickness of 3 to 10 μm along a thickness direction cross section of the anti-glare layer,
wherein the anti-glare layer comprising an organic filler, a binder resin, and chain-like inorganic fine particles dispersed in the binder resin,
the organic filler being selected from the group consisting of polystyrene beads, benzoguanamine-melamine-formaldehyde condensates, styrene-acrylic copolymer beads, benzoguanamine-formaldehyde condensate beads, melamine-formaldehyde condensates, polycarbonate beads, and polyethylene beads,
the chain-like inorganic fine particles being a chain of connected spherical inorganic fine particles, each of the spherical inorganic fine particles having an average primary particle size of 1 nm to 100 nm, and
the chain-like inorganic fine particles arranged to occupy an area ratio of 30 to 94% of the thickness direction cross section of the anti-glare layer.

14. The anti-glare film according to claim 13 ,
wherein the area ratio of the chain-like inorganic fine particles in the thickness direction cross section of the anti-glare layer is 40 to 80%.

15. The anti-glare film according to claim 13 ,
wherein the chain-like inorganic fine particles have a filling rate of 40 to 150% in the anti-glare layer.

16. The anti-glare film according to claim 13 ,
wherein the chain-like inorganic fine particles have the average primary particle size of 1 to 90 nm.

17. The anti-glare film according to claim 13 ,
wherein the anti-glare layer further comprises an inorganic filler, and
the organic filler and the inorganic filler are present in an amount of 5 to 25% by mass.

18. The anti-glare film according to claim 13 ,
wherein the organic filler is at least one selected from the group consisting of styrene-acrylic copolymer beads and polystyrene beads.

19. The anti-glare film according to claim 13 ,
wherein the organic filler has an average particle size of 1 to 10 μm.

20. The anti-glare film according to claim 13 ,
wherein the organic filler has a refractive index of 1.50 or more.

Assignees

• Tsujimoto Jun
• NAITOU Aya
• Doumori Yukihiro
• Narikawa Takashi
• Kodama Takashi
• Dainippon Printing Co Ltd

Inventors

• Tsujimoto Jun
• NAITOU Aya
• Doumori Yukihiro
• Narikawa Takashi
• Kodama Takashi

Classifications

• G02B5/0221 Primary

  the surface having an irregular structure (G02B5/0226 takes precedence) · CPC title

• G02B5/0242

  by means of dispersed particles · CPC title

• G02F1/133502

  Antiglare, refractive index matching layers · CPC title

• G02B1/11 Primary

  Anti-reflection coatings · CPC title

• G02F2201/50

  Protective arrangements · CPC title