Base film of modified polyvinyl alcohol polymer

Abstract

The present invention provides a base film of modified polyvinyl alcohol polymer as well as a method for preparing the base film of modified polyvinyl alcohol polymer and a polarizer made from the base film. The method includes steps of: (1) executing surface graft modification of nano-silicon dioxide particles with fluorinated silane to obtain a modified nano-silicon dioxide powder; (2) adding the modified nano-silicon dioxide powder obtained from the step (1) to an aqueous solution of polyvinyl alcohol polymer, in order to prepare a composite solution of polyvinyl alcohol polymer; and (3) pouring the composite solution of polyvinyl alcohol polymer prepared from the step (2) onto a surface of a casting substrate to obtain a base film of modified polyvinyl alcohol (PVA) polymer. The present invention enhances the heat and humidity resistances and the stability of the PVA base film, and improves its mechanical performance and sticking-resistance.

What is claimed is: 
     
         1 . A base film of modified polyvinyl alcohol polymer, comprising a polyvinyl alcohol polymer, nano-silicon dioxide groups, and fluorinated silane groups, the base film of modified polyvinyl alcohol polymer having the following general formula: 
       
         
           
           
               
               
           
         
         wherein A group is the fluorinated silane group; and B group is the nano-silicon dioxide group; 
         wherein the fluorinated silane group is selected from the group consisting of 
       
       dodecafluoro-heptyl-propyl-trimethoxy-silane, 
       dodecafluoro-heptyl-propyl-methyl-dimethoxy-silane, 
       tetramethyl-(perfluoro-hexyl-ethyl)propyl-trimethoxy-silane, tridecafluoro-octyl-trimethoxy-silane and mixtures thereof;
 iodine molecules are bonded in the polyvinyl alcohol polymer. 
 
     
     
         2 . The base film of modified polyvinyl alcohol polymer as claimed in  claim 1 , wherein the nano-silicon dioxide group connected with the fluorinated silane groups is coated on the polyvinyl alcohol polymer and the iodine molecules. 
     
     
         3 . The base film of modified polyvinyl alcohol polymer as claimed in  claim 1 , wherein the base film of modified polyvinyl alcohol polymer and a protection film adhered on one surface or two surfaces of the base film of modified polyvinyl alcohol polymer commonly form a polarizer.