| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a new cellulose acylate film having a negative thickness-direction retardation Rth and to provide a composition useful for producing the film. <P>SOLUTION: The cellulose acylate composition comprises at least one cellulose acylate having an aromatic group-containing acyl group (Substituent A), in which a substitution degree with the substituent A satisfies following relational expressions (I) and (II); and the cellulose acylate film comprises the above composition. Formulae are: formula (I) DSA2+DSA3-DSA6>0.05; and formula (II) 0.11<DSA2+DSA3+DSA6<0.71, wherein DSA2, DSA3 and DSA6 indicate substitution degrees with Substituent A at the 2-, 3- and 6-positions of the cellulose acrylate, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
