Adhesive optical film, manufacturing method for the same and image display device using the same

Abstract

A pressure-sensitive adhesive optical film of the invention comprises an optical film and a pressure-sensitive adhesive layer provided on the optical film, wherein the pressure-sensitive adhesive layer has a thickness (μm) standard deviation of 0.12 μm or less. The pressure-sensitive adhesive optical film makes it possible to reduce the problem of visible unevenness caused by a pressure-sensitive adhesive layer.

1 . A pressure-sensitive adhesive optical film, comprising an optical film and a pressure-sensitive adhesive layer provided on the optical film, wherein
 the pressure-sensitive adhesive layer has a thickness (μm) standard deviation of 0.12 μm or less.   
     
     
         2 . The pressure-sensitive adhesive optical film according to  claim 1 , wherein
 the optical film is a polarizing plate comprising a polarizer and a first transparent protective film provided on one side of the polarizer or first and second transparent protective films provided on both sides of the polarizer,   the first transparent protective film has a haze value of 15% or less, and   the pressure-sensitive adhesive layer is provided on a side of the polarizing plate opposite to a side where the first transparent protective film is provided.   
     
     
         3 . The pressure-sensitive adhesive optical film according to  claim 1 , wherein the first transparent protective film has a thickness of 60 μm or less. 
     
     
         4 . The pressure-sensitive adhesive optical film according to  claim 2 , wherein the polarizing plate has first and second transparent protective films on both sides of the polarizer, and at least one of the first and second transparent protective films has a thickness of 60 μm or less. 
     
     
         5 . The pressure-sensitive adhesive optical film according to  claim 2 , wherein the polarizer has a thickness of 10 μm or less. 
     
     
         6 . The pressure-sensitive adhesive optical film according to  claim 1 , wherein the optical film is a retardation plate. 
     
     
         7 . The pressure-sensitive adhesive optical film according to  claim 6 , wherein the retardation plate has a thickness of 60 μm or less. 
     
     
         8 . The pressure-sensitive adhesive optical film according to  claim 1 , wherein the optical film has a haze value of 15% or less. 
     
     
         9 . The pressure-sensitive adhesive optical film according to  claim 8 , wherein the optical film is intended to be bonded to a front face plate or a touch panel. 
     
     
         10 . The pressure-sensitive adhesive optical film according to  claim 8 , wherein the optical film has a thickness of 60 μm or less. 
     
     
         11 . The pressure-sensitive adhesive optical film according to  claim 8 , wherein the optical film is a surface treatment film. 
     
     
         12 . A method for producing the pressure-sensitive adhesive optical film according to  claim 1  comprising an optical film and a pressure-sensitive adhesive layer provided on the optical film, the method comprising the steps of:
 (1A) applying a pressure-sensitive adhesive coating liquid with a viscosity Y (P) to the optical film to form a coating with a thickness X (μm); and 
 (2A) drying the applied pressure-sensitive adhesive coating liquid to form a pressure-sensitive adhesive layer, wherein 
 the viscosity Y of the pressure-sensitive adhesive coating liquid and the thickness X of the coating satisfy the relation 0.8X−Y≦68. 
 
     
     
         13 . A method for producing the pressure-sensitive adhesive optical film according to  claim 1  comprising an optical film and a pressure-sensitive adhesive layer provided on the optical film, the method comprising the steps of:
 (1B) applying a pressure-sensitive adhesive coating liquid with a viscosity Y (P) to a release film to form a coating with a thickness X (μm); 
 (2B) drying the applied pressure-sensitive adhesive coating liquid to form a pressure-sensitive adhesive layer; and 
 (3) bonding the pressure-sensitive adhesive layer, which is formed on the release film, to the optical film, wherein the viscosity Y of the pressure-sensitive adhesive coating liquid and the thickness X of the coating satisfy the relation 0.8X−Y≦68. 
 
     
     
         14 . The method for producing the pressure-sensitive adhesive optical film according to  claim 12 , wherein the pressure-sensitive adhesive coating liquid has a viscosity Y (P) of 2 to 160 P, and the coating has a thickness X (μm) of 20 to 250 μm. 
     
     
         15 . A pressure-sensitive adhesive optical film, comprising at least two optical films and at least two pressure-sensitive adhesive layers alternately laminated, wherein
 at least one of the pressure-sensitive adhesive layers has a thickness (μm) standard deviation of 0.12 μm or less.   
     
     
         16 . The pressure-sensitive adhesive optical film according to  claim 15 , wherein each of the at least two pressure-sensitive adhesive layers has a thickness (μm) standard deviation of 0.12 μm or less. 
     
     
         17 . The pressure-sensitive adhesive optical film according to  claim 15 , wherein one of the optical films is a polarizing plate comprising a polarizer and a first transparent protective film provided on one side of the polarizer or first and second transparent protective films provided on both sides of the polarizer,
 the first transparent protective film has a haze value of 15% or less, and   the pressure-sensitive adhesive layer is provided on a side of the polarizing plate opposite to a side where the first transparent protective film is provided.   
     
     
         18 . The pressure-sensitive adhesive optical film according to  claim 17 , wherein the first transparent protective film has a thickness of 60 μm or less. 
     
     
         19 . The pressure-sensitive adhesive optical film according to  claim 17 , wherein the polarizing plate has first and second transparent protective films on both sides of the polarizer, and at least one of the first and second transparent protective films has a thickness of 60 μm or less. 
     
     
         20 . The pressure-sensitive adhesive optical film according to  claim 17 , wherein the polarizer has a thickness of 10 μm or less. 
     
     
         21 . The pressure-sensitive adhesive optical film according to  claim 15 , wherein one of the optical films is a polarizing plate comprising a polarizer and a first transparent protective film provided on one side of the polarizer or first and second transparent protective films provided on both sides of the polarizer,
 the first transparent protective film has a haze value of 15% or less,   the pressure-sensitive adhesive layer is provided on a side of the polarizing plate opposite to a side where the first transparent protective film is provided, and   at least one of the other optical film or films is a retardation plate.   
     
     
         22 . The pressure-sensitive adhesive optical film according to  claim 21 , wherein the retardation plate has a thickness of 60 μm or less. 
     
     
         23 . An image display, comprising at least one piece of the pressure-sensitive adhesive optical film according to  claim 1 .