METHOD FOR PRODUCTION OF POLYESTER RESIN FILM, AND POLYESTER RESIN FILM, ANTIREFLECTIVE FILM AND DIFFUSION FILM PRODUCED BY THE METHOD

摘要

A method for producing a polyester resin film includes melt extruding a polyester resin into a sheet shape, cooling and solidifying the polyester resin sheet on a casting drum, then longitudinally stretching the polyester resin sheet in the longitudinal direction, and then transversely stretching the longitudinally stretched polyester resin film in the transverse direction. The glass transition temperature of the polyester resin, Tg (° C.), the crystallinity of the film after the longitudinal stretching, Xc (%), the crystallization temperature of the film after the longitudinal stretching, Tc (° C.), film surface temperature at the entrance of the stretching zone of a transverse stretching apparatus 30, Ts (° C.), and film surface temperature at the exit of the stretching zone of the transverse stretching apparatus 30, Te (° C.), satisfy: 3≦̸Xc≦̸20; Tg−10≦̸Ts≦̸Tc+20; and Tc−10≦̸Te≦̸Tc+80.