OPTICAL FILM, POLARIZING PLATE USING SAME, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

Disclosed is an optical film which is characterized by containing a polyester polyol that is obtained by having glycol react with an aromatic dibasic acid having an average of 10-16 carbon atoms or an ester-forming derivative of an aromatic dibasic acid having an average of 10-16 carbon atoms. The optical film is also characterized in that the hydroxyl group content in the polyester polyol is more than 50%. The optical film has high retardation developing properties and high transparency, while suffering from less bleedout even under high temperature high humidity conditions. The optical film is not much affected by humidity changes. Also disclosed are a polarizing plate which uses the optical film and has good durability, and a liquid crystal display device.