POLARIZING PLATE PROTECTIVE FILM, PRODUCTION METHOD THEREFOR, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

The purpose of the present invention is to provide a polarizing plate protective film having: suppressed elongation during detachment in a film-formation step even if the film includes an aromatic vinyl-based resin; uniform thickness; and good adhesion to polarizers. This polarizing plate protective film includes a copolymer (I) including a structural unit derived from aromatic vinyl monomers (A) and a structural unit derived from annular acid anhydride monomers (B), and having a structure wherein at least two of the annular acid anhydride monomers (B) are directly bonded to each other.