Optical film, laminated film, and touch panel

Patent metadata

Field	Value
Publication number	US-12333099-B2
Application number	US-202117196496-A
Country	US
Kind code	B2
Filing date	Mar 9, 2021
Priority date	Sep 28, 2018
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

An optical film includes a substrate film and an adhesion-facilitating layer arranged on at least one surface of the substrate film, in which the adhesion-facilitating layer contains a resin, silica particles, and metal oxide particles other than the silica particles; a ratio of a percentage A of an area derived from the metal oxide particles in a total area of a specific lower region to a percentage B of an area derived from the metal oxide particles in a total area of a specific upper region is 1.05 or more; and the surface of the adhesion-facilitating layer opposite to the substrate film side has an arithmetic mean roughness Ra of 10 nm or more and less than 20 nm.

First claim

What is claimed is:

1. An optical film comprising:
a substrate film; and
an adhesion-facilitating layer arranged on at least one surface of the substrate film,
wherein the adhesion-facilitating layer contains a resin, silica particles, and metal oxide particles other than the silica particles;
in a case where, in a vertical cross section of the adhesion-facilitating layer, a region to a height corresponding to 50% of an average film thickness of the adhesion-facilitating layer from a substrate film side of the adhesion-facilitating layer is defined as a lower region, and a region excluding the lower region of the adhesion-facilitating layer is defined as an upper region, a ratio of a percentage A of an area derived from the metal oxide particles in a total area of the lower region to a percentage B of an area derived from the metal oxide particles in a total area of the upper region is 1.05 or more;
the surface of the adhesion-facilitating layer opposite to the substrate film side has an arithmetic mean roughness Ra of 10 nm or more and 19 nm or less;
a mass ratio of the metal oxide particles to the silica particles is 9.0 to 11.0; and
a content of the metal oxide particles in the adhesion-facilitating layer is 3.0% to 6.0% by volume with respect to the total volume of the adhesion-facilitating layer.

2. The optical film according to claim 1 ,
wherein the percentage A is 80% or more.

3. The optical film according to claim 1 ,
wherein a percentage D of an area derived from the silica particles in a total area of the upper region is larger than a percentage C of an area derived from the silica particles in a total area of the lower region.

4. The optical film according to claim 3 ,
wherein a ratio of the percentage D to the percentage C is 2.0 or more.

5. The optical film according to claim 3 ,
wherein the percentage D is 8% or more.

6. The optical film according to claim 1 ,
wherein the adhesion-facilitating layer has a refractive index of 1.56 to 1.60.

7. The optical film according to claim 1 ,
wherein the adhesion-facilitating layer has an average film thickness of more than 80 nm and less than 120 nm.

8. The optical film according to claim 1 ,
wherein the metal oxide particles have an average particle size of 10 nm or less.

9. The optical film according to claim 1 ,
wherein a metal atom contained in the metal oxide particles is one selected from the group consisting of zirconium and titanium.

10. The optical film according to claim 1 ,
wherein the metal oxide particles are not subjected to a surface treatment.

11. The optical film according to claim 1 ,
wherein the silica particles have an average particle size of 50 to 120 nm.

12. The optical film according to claim 1 ,
wherein the adhesion-facilitating layer contains at least one resin selected from the group consisting of an acrylic resin, a methacrylic resin, and a polyester resin.

13. A laminated film comprising:
the optical film according to claim 1 ; and
a resin layer arranged on an adhesion-facilitating layer of the optical film.

14. The laminated film according to claim 13 ,
wherein the resin layer contains an acrylic resin or a methacrylic resin.

15. The laminated film according to claim 13 ,
wherein the resin layer contains a metal component.

16. The laminated film according to claim 13 ,
wherein the metal component constitutes a thin metal wire.

17. A touch panel comprising:
the laminated film according to claim 13 .

Assignees

• Fujifilm Corp

Inventors

• Inoue Daisuke
• Isobe Yu

Classifications

• B32B2264/1024

  Zirconia · CPC title

• B32B2264/1021

  Silica · CPC title

• B32B2307/538

  Roughness · CPC title

• B32B2457/208

  Touch screens · CPC title

• B32B2255/26

  Polymeric coating · CPC title