POLYVINYL ALCOHOL FILM, METHOD FOR PRODUCING POLYVINYL ALCOHOL FILM, POLARIZING FILM, AND POLARIZING PLATE

摘要

Disclosed is a polyvinyl alcohol resin film which has excellent stretchability and is suppressed in dyeing unevenness. The polyvinyl alcohol resin film is suitable for use as an optical film such as a polarizing film. Specifically disclosed is a polyvinyl alcohol film which is obtained by forming a film-forming material that contains a polyvinyl alcohol resin (A) into a film. The polyvinyl alcohol film has a ratio of the swelling degree (XTD) in the transverse direction (TD) to the swelling degree (XMD) in the machine direction (MD), namely XTD/XMD of 1.000-1.020 when the film is immersed and swelled in water at 30°C for 5 minutes.