RETARDATION FILM, METHOD FOR PRODUCING RETARDATION FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY

摘要

Disclosed are a retardation film, a method for producing the retardation film, a polarizing plate comprising the retardation film, and a liquid crystal display comprising the polarizing plate. Specifically disclosed is a method for producing a retardation film, which comprises an extrusion step for extruding a composition containing a thermoplastic resin and having a temperature of To[°C] from a die; a cooling step for cooling a film extruded from the die and having a glass transition temperature of Tg[°C] to a temperature Ta[°C]; a heating step for heating the cooled film to a temperature Tb[°C] at least once; and a stretching step for cooling the heated film to a temperature Tc[°C] and then stretching the cooled film in the width direction.