Cellulose Compound Film, Optical Compensation Sheet, Polarizing Plate, and Liquid Crystal Display Device

摘要

A cellulose compound film containing a cellulose compound having two or more substituents whose polarizability anisotropies Deltaalpha calculated by mathematical formula (1) are different from each other, wherein substitution degrees of the following substituents A and B in the cellulose compound satisfy relationship as defined by mathematical formula (A1), in which the substituent A has the lowest Deltaalpha and the substituent B has the highest Deltaalpha: $\begin{array}{cc}\mathrm{Delta}\mathrm{alpha}=\mathrm{alpha}x-\frac{\mathrm{alpha}y+\mathrm{alpha}z}{2}& \mathrm{Mathematical}\mathrm{formula}\left(1\right)\end{array}$ wherein, in characteristic values obtained after diagonalization of polarizability tensor, alphax is the largest component, alphay is the second largest component, and alphaz is the smallest component; DS_B2+DS_B3-DS_B6>=-0.1 Mathematical formula (A1) wherein DS_B2, DS_B3, and DS_B6 represent a substitution degree of the substituent B at the 2-, 3-, or 6-position of a beta-glucose ring constituting unit of cellulose, respectively; and an optical compensation film, a polarizing plate, and a liquid crystal display device, using the cellulose compound film.