Polyvinyl alcohol polymer film and polarization film

Abstract

A polyvinyl alcohol polymer film in which the amount of a polyvinyl alcohol polymer eluted when a 10 cm square polyvinyl alcohol polymer film is left in 1 liter of water of 50° C. for 4 hours is from 1 to 100 ppm. A polyvinyl alcohol film in which the content of an alkali metal compound is 0.5% by weight or less based on the polyvinyl alcohol. Further, a polarization film produced by using the same.

What is claimed is:  
     
         1 . A polyvinyl alcohol polymer film in which the amount of a polyvinyl alcohol polymer eluted when a 10 cm square polyvinyl alcohol polymer film is left in 1 liter of water of 50° C. for 4 hours is from 1 to 100 ppm.  
     
     
         2 . The polyvinyl alcohol polymer film according to    claim 1    wherein the content of an alkali metal compound is 0.5% by weight or less based on the polyvinyl alcohol polymer.  
     
     
         3 . The polyvinyl alcohol polymer film according to    claim 2    wherein the alkali metal compound is sodium acetate.  
     
     
         4 . The polyvinyl alcohol polymer film according to    claim 1    which is used for a polarization film.  
     
     
         5 . The polyvinyl alcohol polymer film according to    claim 2    which is used for a polarization film.  
     
     
         6 . The polyvinyl alcohol polymer film according to    claim 3    which used for a polarization film.  
     
     
         7 . A polarization film made by using a polyvinyl alcohol polymer film for a polarization film of    claim 4   .  
     
     
         8 . A polarization film made by using a polyvinyl alcohol polymer film for a polarization film of    claim 5   .  
     
     
         9 . A polarization film made by using a polyvinyl alcohol polymer film for a polarization film of    claim 6   .  
     
     
         10 . A method of producing a polyvinyl alcohol polymer film of    claim 2    comprising film-forming using as a raw material a polyvinyl alcohol polymer in which the content of an alkali metal compound is 0.5% by weight or less based on the polyvinyl alcohol polymer.  
     
     
         11 . The method of producing a polyvinyl alcohol polymer film for a polarization film according to    claim 10    comprising film-forming using a film formation raw material prepared at temperatures of 150° C. or less containing a polyvinyl alcohol polymer in which the content of an alkali metal compound is 0.5% by weight or less based on the polyvinyl alcohol polymer.