abstract |
(57) [Summary] [Objective] To provide a method for producing a high-contrast polarizing film. [Structure] A film made of polyvinyl alcohol having a degree of polymerization of 2000 to 10000 is uniaxially stretched by a dry method, and then iodine or a dye is adsorbed and oriented, and 70 ° C to 8 ° C. It is characterized by being immersed in a boric acid-containing aqueous solution at 5 ° C. |