PRODUCTION METHOD OF POLYENE-BASED POLARIZING FILM, POLYENE-BASED POLARIZING FILM, LAMINATE POLARIZING FILM, AND DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a production method of a novel and improved polarizing film, by which a polarizing film with good optical characteristics can be produced.SOLUTION: In one aspect, a production method of a polyene-based polarizing film is provided, which includes steps of: preparing a dehydrated film by dehydrating a polyvinyl alcohol film by use of an acid catalyst; hydrating the dehydrated film by impregnating the dehydrated film with a hydration aqueous solution at a pH of 4.0 or lower and at 85°C or higher for 0.5 to 60 minutes; and wet-stretching the dehydrated or hydrated film in an acidic aqueous solution at 65°C or lower before or after hydrating the dehydrated film.