OPTICAL FILM, RETARDATION PLATE, POLARIZING PLATE, SUBSTRATE FOR LIQUID CRYSTAL DISPLAY ELEMENT, AND LIQUID CRYSTAL DISPLAY ELEMENT

摘要

PPROBLEM TO BE SOLVED: To provide an optical film showing a large retardation even when the film is not stretched or stretched in a small stretching ratio, and to provide a retardation plate, a polarizing plate, a substrate for a liquid crystal display element and a liquid crystal display element using the optical film. PSOLUTION: The optical film comprises a block copolymer or a graft copolymer which is a copolymer containing a polymer moiety having an alicyclic structure in the main chain skeleton and which has crystalline polymer unit chains as a part of the copolymer, and shows a retardation of 20 nm or more in a non-stretched state. It is preferable that the crystalline polymer unit chain comprises a polymer having an alicyclic structure in the main chain skeleton. PCOPYRIGHT: (C)2007,JPO&INPIT