Method of manufacturing polarizing plate

Abstract

A method of manufacturing a polarizing plate according to an embodiment of the present invention includes: stretching and dyeing a laminate having a resin substrate and a polyvinyl alcohol-based resin layer formed on at least one side of the resin substrate to produce a polarizing film on the resin substrate; laminating an optically functional film on the laminate on a polarizing film side to produce an optically functional film laminate; and peeling the resin substrate from the optically functional film laminate. The peeling is performed so that an angle α formed between a surface of the optically functional film laminate immediately before the peeling and a peeling direction of the resin substrate is smaller than an angle β formed between the surface of the optically functional film laminate immediately before the peeling and a peeling direction of the polarizing film.

1 .- 16 . (canceled) 
     
     
         17 . A method of manufacturing a polarizing plate, comprising:
 forming a laminate having a resin substrate and a polyvinyl alcohol-based resin layer formed on one side of the resin substrate;   stretching and dyeing the laminate to produce a polarizing film on the resin substrate;   laminating an optically functional film on the polarizing film on the resin substrate to produce an optically functional film laminate; and   peeling the resin substrate from the optically functional film laminate,   wherein the peeling is performed so that an angle α is smaller than an angle β;   wherein the angle α is formed between a surface of the optically functional film laminate immediately before the peeling and a peeling direction of the resin substrate, and   wherein the angle β is formed between the surface of the optically functional film laminate immediately before the peeling and a peeling direction of the polarizing film.   
     
     
         18 . The method of manufacturing the polarizing plate according to  claim 17 , wherein a difference between the angle α and the angle β is 60° or more. 
     
     
         19 . The method of manufacturing the polarizing plate according to  claim 18 , wherein the difference between the angle α and the angle β is 90° to 180°. 
     
     
         20 . The method of manufacturing the polarizing plate according to  claim 17 , wherein a tension needed for the peeling is 3.0 N/mm or less. 
     
     
         21 . The method of manufacturing the polarizing plate according to  claim 17 , wherein the resin substrate has a modulus of elasticity at a time of the peeling of 2 GPa to 3 GPa. 
     
     
         22 . The method of manufacturing the polarizing plate according to  claim 17 , wherein the resin substrate has a radius of curvature at a time of the peeling of 1 mm to 10 mm. 
     
     
         23 . The method of manufacturing the polarizing plate according to  claim 17 , wherein, in the peeling, a peeling roll is arranged on the optically functional film laminate on an optically functional film side, and the peeling is performed with an aid of the peeling roll. 
     
     
         24 . The method of manufacturing the polarizing plate according to  claim 23 , wherein the peeling roll has a diameter of 10 mm to 30 mm. 
     
     
         25 . The method of manufacturing the polarizing plate according to  claim 17 , wherein, in the peeling, a peeling bar is arranged on the optically functional film laminate on an optically functional film side, and the peeling is performed with an aid of the peeling bar. 
     
     
         26 . The method of manufacturing the polarizing plate according to  claim 25 , wherein the peeling bar has a diameter of a tip portion of 5 mm to 30 mm. 
     
     
         27 . The method of manufacturing the polarizing plate according to  claim 23 , wherein a surface of the optically functional film laminate on the optically functional film side has a surface protective film attached thereto. 
     
     
         28 . The method of manufacturing the polarizing plate according to  claim 25 , wherein a surface of the optically functional film laminate on the optically functional film side has a surface protective film attached thereto.