Patent ID: 7635506

Claim:
A stretched cellulose ester film, containing: a cellulose ester, and a plasticizer, wherein the cellulose ester has a total acyl substitution degree of 2.4 to 2.9, a number average molecular weight (Mn) of 30000 to 200000, and a value of a weight-average molecular weight (Mw)/a number average molecular weight (Mn) being 1.4 to 3.0, and the plasticizer includes at least two kinds of an aromatic terminal ester type plasticizer expressed by the following general formula (1) and a polyvalent alcohol ester type plasticizer in combination, and the cellulose ester film contains the aromatic terminal ester type plasticizer in an amount of 1 to 20% by weight: B—(G—A) n —G—B General formula (1) where B represents a benzenemonocarboxylic acid residue, G represents an alkylene glycol residue having a carbon number of 2 through 12 or an oxyalkylene glycol residue having a carbon number of 4 through 12, A represents an alkylene dicarboxylic acid residue having a carbon number of 4 to 12, and n indicates an integer of 0 or more.