Cellulose acetate propionate
AssigneeDaicel Chemical Industries, Ltd.
InventorsYuichiro Shuto, Hiroki Taniguchi
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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.ltoreq.2.95 (I) 0.05<DSpr.ltoreq.0.8 (II) 2.6<DSac+DSpr.ltoreq.3.0 (III) 1.9<DSac-DSpr (IV)
Claims8
Cellulose acetate propionate having an amorphous index (Am) of 0.01 to 0.10 defined in the following formula:
- ##EQU3## in which I(2.theta.=5.degree.) and I(2.theta.=14.5.degree.) mean X-ray scattering intensities where Bragg angles (2.theta.) are 5.degree. and 14.5.degree. respectively, which are obtained by forming a film of 100 .mu.m thick from a cellulose acetate propionate solution, treating the film at 200.degree. C. for 60 minutes and measuring X-ray diffraction of the film;
- n means the number of peaks observed in X-ray scattering intensity curve within the range of 5.degree. to 14.5.degree. of Bragg angles (2.theta.) in the measurement of the film;
- and Pi means X-ray scattering intensity at the peak number i in the measurement of the film.
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.ltoreq.2.95 (I)
- 0.05<DSpr.ltoreq.0.8 (II)
- 2.6<DSac+DSpr.ltoreq.3.0 (III)
- 1.9<DSac-DSpr (IV)
Dependencies are inferred from the claim text.