CELLULOSE ACETATE PROPIONATE FILM, PROCESS FOR PRODUCING CELLULOSE ACETATE PROPIONATE FILM, OPTICAL COMPENSATION SHEET, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a cellulose acylate film having no crosslinked structure and a high modulus, and further an optical compensation sheet, a polarizing plate and a liquid crystal display device including at least any thereof.;SOLUTION: A cellulose acetate propionate film has a density νe of entanglement points of a polymer chain of cellulose acetate propionate represented by the following equation (A) of from 0.3 to 2.0 mol/dm³: νe=E_R'/3RT_R (A), wherein R represents a gas constant, E_R' represents a storage elastic modulus in a rubbery state plateau upon measurement of a dynamic viscoelasticity and T_R represents a temperature in the rubbery state plateau.;COPYRIGHT: (C)2009,JPO&INPIT