| abstract |
PROBLEM TO BE SOLVED: To provide a cellulose mixed ester solution having a gelling property at a low temperature and capable of gelling and peeling in a film forming process, and a method for preparing the same. SOLUTION: The hydroxyl group of cellulose is substituted with an acetyl group and a propionyl group, and the degree of substitution of the acetyl group (DSac A mixed solution of a lower fatty acid ester such as methyl acetate of cellulose acetate propionate and a lower alcohol such as ethanol, wherein e) and the degree of substitution (DSpro) of the propionyl group satisfy the following formulas (I) to (III): , 40 ℃ Hereinafter, it is a cellulose mixed ester solution that gels in the process of cooling to −40 ° C. (I) 2.45 <DSace ≦ 2.95 (II) 0.05 ≦ DSpro <0.55 (III) 2.70 <DSace + DSpro ≦ 3.00 |