POLYVINYL ALCOHOL RESIN FOR PRODUCTION OF POLARIZING FILM, METHOD FOR PRODUCING SAME, POLYVINYL ALCOHOL FILM, METHOD FOR PRODUCING POLYVINYL ALCOHOL FILM, POLARIZING FILM AND POLYVINYL ALCOHOL RESIN

摘要

The present invention is a polyvinyl alcohol resin for the production of a polarizing film, which has a weight swelling degree of 1.4-1.65 as calculated by formula (1). Consequently, a polyvinyl alcohol film that has excellent dyeability and transparency necessary for the production of a polarizing film, which is free from display defects and polarization unevenness, is able to be produced with high productivity.(Weight swelling degree) = (Weight when subjected to centrifugal separation at 2,000 G for 1 minute after having been immersed in water at 15°C for 1 hour)/(Weight when dried at 105°C for 2 hours after the centrifugal separation) (1)