A polyvinyl alcohol-based film for manufacturing a polarizing film, and a polarizing film obtained by using the same, and a polyvinyl alcohol-based resin aqueous solution

摘要

A polyvinyl alcohol-based film for producing a polarizing film that can reduce shrinkage in the width direction during the production of a polarizing film, that is, a polarizing film can be produced with a high width yield, with a thickness of 5 to 75 μm, a width of 2 m or more, and a length of 2 km. In the above polyvinyl alcohol-based film, the swelling degree X (%) in the width direction X (%) 120 ≤ X ≤ 140 after immersion in water at 23.5° C. for 5 minutes, and the film width yield W (%) obtained by conducting a polarizing film production test ) Provides a polyvinyl alcohol-based film for producing a polarizing film, characterized in that W≥43.