Cellulose acetate propionate, solution thereof and cellulose acetate propionate film
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 not more than 0.4. Cellulose acetate propionate has a degree of acetyl substitution (DSac) and a degree of propionyl substitution (DSpr), which preferably satisfy the formulas (I) to (III), and more preferably satisfy the formulas (I) to (IV). The present invention also provides a solution of cellulose acetate propionate and a cellulose acetate propionate film. (I) 2.0<DSac.ltoreq.2.95 (II) 0.05<DSpr.ltoreq.0.8 (III) 2.6<DSac+DSpr.ltoreq.3.0 (IV) 1.9<DSac-DSpr
Claims16
A solution of cellulose acetate propionate in an organic solvent, wherein the cellulose acetate propionate has an amorphous index (Am) of not more than 0.4 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.
A cellulose acetate propionate film prepared by a solvent casting method using a solution of cellulose acetate propionate in an organic solvent, wherein the cellulose acetate propionate has an amorphous index (Am) of not more than 0.4 defined in the following formula:
- ##EQU4## 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.
Dependencies are inferred from the claim text.