US Patent 7501167 Cellulose acylate film, polarizing plate, and liquid crystal display device

A cellulose acylate film comprising cellulose acylate which has a degree of crystallinity represented by the following expression (I) of 0.9 or more, and satisfies the following expressions (II) and (III):Degree of crystallinity=(X-ray diffraction intensity at 2θ of 13°)/(X-ray diffraction intensity at 2θ of 12°);  Expression (I)2.6≦A+B≦3.0; and  Expression (II)0.5≦B≦1.2  Expression (III)wherein A represents a substitution degree by an acetyl group of a hydroxyl group in a glucose unit of the cellulose acylate, and B represents a substitution degree by a substituent having from 3 to 4 carbon atoms of a hydroxyl group of a glucose unit of the cellulose acylate.