Anti-reflection film

Patent metadata

Field	Value
Publication number	US-11372138-B2
Application number	US-201816645252-A
Country	US
Kind code	B2
Filing date	Aug 6, 2018
Priority date	Sep 8, 2017
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

An anti-reflection film (X) of the present invention includes a laminated structure including a substrate ( 11 ), a hard coat layer ( 12 ), and an anti-reflection layer ( 13 ), and a luminous reflectance of the anti-reflection layer ( 13 ) side is 2% or less. The anti-reflection layer ( 13 ) includes a surface ( 13 a ) having a coefficient of kinetic friction of 0.3 or less and a coefficient of static friction of 0.3 or less. In addition, in the anti-reflection film (X), after a rubbing test performed on the surface ( 13 a ) using steel wool #0000 as a rubbing material under conditions of a load of 200 g/cm 2 , a rubbing stroke length of 10 cm, and reciprocations of 1000 times, a difference of the haze value (%) after the rubbing test from the haze value (%) before the rubbing test is 0.1 or less. Such an anti-reflection film is suitable for achieving high scratch resistance together with high anti-reflective properties.

First claim

The invention claimed is:

1. An anti-reflection film comprising a laminated structure comprising:
a substrate;
an anti-reflection layer; and
a hard coat layer positioned therebetween;
wherein the anti-reflection layer comprises a curable resin a fluorine-containing curable compound, nanodiamond particles, and low-refraction-index particles; and
wherein the curable resin is a polymer of one or more (meth)acryloyl group-containing compounds; and
wherein the low-refractive-index particles are hollow silica particles;

wherein a mass ratio of the low-refractive-index particles to the nanodiamond particles in the anti-reflection layer is in a range from 99:1 to 84:16;
wherein a luminous reflectance of the anti-reflection layer side is 2% or less;
wherein the anti-reflection layer comprises a surface having a coefficient of kinetic friction of 0.3 or less and a coefficient of static friction of 0.3 or less on the opposite side of the hard coat layer; wherein the surface of the anti-reflection layer has a surface roughness of 5 nm or less and
wherein after a rubbing test performed on the surface of the anti-reflection layer using steel wool #0000 as a rubbing material under conditions of a load of 200 g/cm 2 , a rubbing stroke length of 10 cm, and reciprocations of 1000 times, a difference of the haze value (%) after the rubbing test from the haze value (%) before the rubbing test is 0.1 or less.

2. The anti-reflection film according to claim 1 , wherein after a rubbing test performed on the surface of the anti-reflection layer using steel wool #0000 as a rubbing material under conditions of a load of 1000 g/cm 2 , a rubbing stroke length of 10 cm, and reciprocations of 100 times, a difference of a haze value (%) from a haze value (%) before the rubbing test is 0.1 or less.

3. The anti-reflection film according to claim 1 , wherein the haze is 1% or less.

4. The anti-reflection film according to claim 1 , wherein the haze after the rubbing test is 1% or less.

5. The anti-reflection film according to claim 1 , wherein the anti-reflection layer comprises low-refractive-index particles.

6. The anti-reflection film according to claim 1 , wherein the anti-reflection layer comprises a fluorine-containing curable compound.

7. The anti-reflection film according to claim 1 , wherein an average particle size of the low-refractive-index particles is from 50 to 70 nm.

8. The anti-reflection film according to claim 1 , wherein the nanodiamond particles are surface-modified nanodiamond particles with a silane coupling agent.

9. The anti-reflection film according to claim 8 , wherein the silane coupling agent is bonded to the nanodiamond particle and comprises an organic chain containing a (meth)acryloyl group.

10. The anti-reflection film according to claim 9 , wherein the organic chain containing a (meth)acryloyl group is propyl acrylate and/or propyl methacrylate.

11. The anti-reflection film according to claim 8 , wherein the silane coupling agent is bonded to the nanodiamond particle and comprises an organic chain containing an alkyl group.

12. The anti-reflection film according to claim 11 , wherein the alkyl group has from 1 to 18 carbons.

13. The anti-reflection film according to claim 1 , wherein a particle size D50 of the nanodiamond particles is 100 nm or less.

Assignees

• Daicel Corp

Inventors

• Sakakibara Takahiro
• Umemoto Kouichi
• Kojima Ryouta
• Kageyama Hiroki

Classifications

• G02B27/20

  for imaging minute objects, e.g. light-pointer · CPC title

• B32B27/18

  characterised by the use of special additives · CPC title

• G02B1/14 Primary

  Protective coatings, e.g. hard coatings · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• G02B1/111 Primary

  using layers comprising organic materials · CPC title