Daicel Chemical Industries, Ltd.

Yukiko Nakanishi

Hiroki Taniguchi

Katako Ueda

Masahiko Murayama

Yuichiro Shuto

Using the dope containing the following cellulose acetate (1), (2), or (3), a film is prepared by the casting process:

Method for producing cellulose acetate film

Cellulose acetate and dope containing the same

The present invention provides a cellulose ester composition, containing 1 to 99% by weight of cellulose triacetate prepared by substituting hydroxyl groups of cellulose with acetyl and having a degree of substitution with acetyl, DSace, which satisfies the relationship: 2.7.ltoreq.DSace.ltoreq.3.0, and 99 to 1% by weight of a mixed fatty acid ester of cellulose prepared by substituting hydroxyl groups of cellulose with acetyl and acyl groups having three or more carbon atoms and having degrees of substitution with acetyl and acyl groups having three or more carbon atoms, DSace and DSacyl, respectively, which satisfy the relationships: (I) 2.20.ltoreq.DSace.ltoreq.2.95, (II) 0.05.ltoreq.DSacyl.ltoreq.0.80 and (III) 2.60.ltoreq.DSace+DSacyl.ltoreq.3.00.

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Akashi, Japan

Yukiko Nakanishi