Polyvinyl alcohol-based films, polarizing films, and polarizing plates

Abstract

This invention provides a polyvinyl alcohol (PVA) based film that exhibits uniform and good optical properties in suppressing defects such as optical streaks. The PVA based film contains a PVA-based resin and a surfactant, wherein the surfactant comprises a nonionic surfactant (A) and an anionic surfactant (B). The nonionic surfactant (A) includes a nitrogen-containing nonionic surfactant (A1) and an ether-containing nonionic surfactant (A2). The total amount (X) of the nonionic surfactant (A) and the anionic surfactant (B) relative to 100 parts by mass of the PVA-based resin is 0.2 parts by mass or less, and the content of the nitrogen-containing nonionic surfactant (A1) relative to the total amount (X) is 50% by mass or less.