| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positive C plate comprising cellulose acylate carbamoyl of which the through-thickness retardation of a film of 100 μm is -30 to -160 nm; and to provide cellulose acylate carbamoyl which provides such a positive C plate. <P>SOLUTION: The derivative is prepared by substituting some or all of hydroxyl groups of cellulose with an acyl group and a phenylcarbamoyl group, and the film is obtained from cellulose acyl phenylcarbamoyl, wherein the degree of substitution with the phenylcarbamoyl group (DSpc) in an optional total degree of substitution (DStotal) is adjusted so that a=0.0550, b=-0.0164, c=-0.0367 and d=-0.0050, and DStotal>DSpc are met in an expression of (a+b×DStotal-d)/(b-c)<DSp. <P>COPYRIGHT: (C)2011,JPO&INPIT |
