| abstract |
Cellulose acetate propionate is a cellulose ester wherein hydroxyl groups of cellulose are substituted with acetyl and propionyl. Cellulose acetate propionate of the present invention has an amorphous index (Am) of 0.01 to 0.10. The present invention also provides cellulose acetate propionate having a degree of acetyl substitution (DSac) and a degree of propionyl substitution (DSpr) satisfying the formulas (I) to (IV).2.0<DSac</=2.95(I)0.05<DSpr</=0.8(II)2.6<DSac+DSpr</=3.0(III)1.9<DSac-DSpr(IV) |