Polarizer, process for preparing the same, optical member and liquid crystal displaying apparatus

Abstract

An object of the present invention is to provide a polarizer which is thin and light as well as has durability, and an optical member capable of forming a liquid-crystalline displaying apparatus for mobiles which is excellent in reliance. According to the present invention, there is provided a polarizer, which comprises a protecting film comprising an epoxy resin as a main component on at least one side of a polarizing film. This polarizer can be produced by a method of coating an uncured epoxy resin composition on at least one side of a polarizing film, and then curing the composition to form a protecting film. Also, an optical member comprising a laminate of the aforementioned polarizer and other optical layer exhibiting the optical function is provided and, further, a liquid crystal displaying apparatus comprising the optical member disposed on one side or both sides of a liquid-crystalline cell is provided.

1 . A polarizer comprising a polarizing film and a protecting film which comprises an epoxy resin as a main component on at least one side of the polarizing film.  
     
     
         2 . The polarizer according to the  claim 1 , wherein the epoxy resin is free from an aromatic ring.  
     
     
         3 . The polarizer according to  claim 1 , wherein the polarizing film is a film of polyvinylalcohol in and/or on which a dichromatic dye is adsorbed and oriented.  
     
     
         4 . A process for producing a polarizer comprising coating an uncured epoxy resin composition on at least one side of a polarizing film, and then curing the composition to form a protecting film.  
     
     
         5 . The process according to  claim 4 , wherein the curing is performed by cation polymerization with at least one selected from the group consisting of heat and active energy ray.  
     
     
         6 . An optical member comprising a laminate of the polarizer according to any one of  claims 1  to  3  and other optical layer exhibiting the optical function.  
     
     
         7 . The optical member according to  claim 6 , wherein the optical layer is a retarder.  
     
     
         8 . A liquid-crystalline displaying apparatus comprising a liquid-crystalline cell and the optical member according to  claim 6  which is disposed on one side or both sides of the liquid-crystalline cell.  
     
     
         9 . A liquid-crystalline displaying apparatus comprising a liquid-crystalline cell and the optical member according to  claim 7  which is disposed on one side or both sides of the liquid-crystalline cell.