Optical film, production process thereof, anti-reflection film, polarizing plate and display device

Abstract

An optical film, which comprises: a transparent support; and at least two layers each containing a cured product on or above the transparent support, wherein the layer to be brought into contact with the surface of the transparent support contains a cured product of a below-described composition (I) and the outermost layer of the optical film is a layer containing a cured product of a below-described composition (II):

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view illustrating a preferred exemplary embodiment of an antireflection film according to an aspect of the invention;

FIG. 2 is a schematic cross-sectional view illustrating another preferred exemplary embodiment of an antireflection film according to an aspect of the invention;

FIG. 3 is a schematic cross-sectional view illustrating a further preferred exemplary embodiment of an antireflection film according to an aspect of the invention;

FIG. 4 is a schematic cross-sectional view illustrating a preferred exemplary embodiment of an antireflection film having an antiglare hard coat layer according to an aspect of the invention; and

FIG. 5 is a schematic cross-sectional view of another preferred exemplary embodiment of an antireflection film having an antiglare hard coat layer according to an aspect of the invention.

Claims

1. An optical film, which comprises: a transparent support; andat least two layers each containing a cured product on or above the transparent support, the at least two layers comprising: a layer to be brought into contact with a surface of the transparent support; and an outermost layer of the optical film,wherein the layer to be brought into contact with the surface of the transparent support contains a cured product of a below-described composition (I) and the outermost layer of the optical film is a layer containing a cured product of a below-described composition (II):Composition (I): a composition comprising: a polyfunctional compound (a) having two or more ethylenically unsaturated groups; at least one of a photo-polymerization initiator and a thermo-polymerization initiator; and metal oxide particles,Composition (II): a composition comprising: a binder polymer; a polyfunctional compound (b) having two or more ethylenically unsaturated groups; at least one of a photo-polymerization initiator and a thermo-polymerization initiator; and metal oxide particles.

2. The optical film according to claim 1, wherein the metal oxide particles are at least one kind of particles selected from the group consisting of particles made of silicon dioxide, particles made of tin oxide, particles made of indium oxide, particles made of zinc oxide, particles made of zirconium oxide and particles made of titanium oxide.

3. The optical film according to claim 1, wherein the metal oxide particles are aggregating particles, colloidal particles or hollow particles.

4. The optical film according to claim 2, wherein the particles made of silicon dioxide are aggregating silica particles or colloidal silica particles.

5. The optical film according to claim 1, wherein the metal oxide particles have conductivity.

6. The optical film according to claim 1, wherein the metal oxide particles have a particle size of 1 nm or greater but not greater than 1 μm.

7. The optical film according to claim 1, wherein the metal oxide particles are surface-modified with a compound having hydrolyzable silicon.

8. The optical film according to claim 1, wherein the binder polymer is at least one of a heat curable fluorine-containing polymer and an ionizing-radiation curable fluorine-containing polymer.

9. The optical film according to claim 1, wherein at least one of the composition (I) and the composition (II) further comprises light transmitting resin particles having an average particle diameter in a range of from 1 nm to 15 μm.

10. The optical film according to claim 1, wherein the polyfunctional compound (b) in the composition (II) is at least one of a hydrolysate of an organosilane and a partial condensate thereof.

11. An antireflection film which is an optical film according to claim 1 having an antireflective function.

12. A polarizing plate, which comprises: a pair of protective films; anda polarization film between the pair of protective films,wherein at least one of the pair of protective films is an optical film according to claim 1.

13. A display device, which comprises an optical film according to claim 1, wherein the layer of the optical film containing the cured product of the composition (II) is disposed on a viewer side.

14. A process for producing an optical film comprising a transparent support and at least two layers each containing a cured product on or above the transparent support, the process comprising: applying a below-described composition (I) to the transparent support as a layer to be brought into contact with a surface of the transparent support;drying and then curing the composition (I) by at least one of a heating and an exposure to ionizing radiation in an atmosphere having an oxygen concentration of 3 vol. % or less; andapplying a below-described composition (II) as an outermost layer of the optical film;drying and then curing the composition (II) by at least one of a heating and an exposure to ionizing radiation in an atmosphere having an oxygen concentration of 3 vol. % or less:Composition (I): a composition comprising: a polyfunctional compound (a) having two or more ethylenically unsaturated groups; at least one of a photo-polymerization initiator and a thermo-polymerization initiator; and metal oxide particles,Composition (II): a composition comprising: a binder polymer; a polyfunctional compound (b) having two or more ethylenically unsaturated groups; at least one of a photo-polymerization initiator and a thermo-polymerization initiator; and metal oxide particles.