Preparation of poly alpha-1,3-glucan esters and films therefrom
View Patent ↗Poly alpha-1,3-glucan ester compounds are disclosed herein with a degree of substitution of about 0.05 to about 3.0. Also disclosed are methods of producing poly alpha-1,3-glucan ester compounds and films made therefrom.
1. A film comprising poly alpha-1,3-glucan ester having at least one of:
(a) a tear resistance of at least about 0.1 gf/mil; or
(b) a haze of less than about 20%
wherein the poly alpha-1,3-glucan ester is a mixed ester.
2. The film of claim 1 , wherein the poly alpha-1,3-glucan ester comprises two or more of acetate, propionyl, butyryl, pentanoyl, hexanoyl, heptanoyl or octanoyl groups.
3. The film of claim 1 , wherein the film has at least one of:
(a) a tear resistance from about 2.0 to about 2.4 gf/mil; or
(b) a haze of less than about 10%.
4. The film of claim 3 , wherein the poly alpha-1,3-glucan ester comprises two or more of acetate, propionyl, butyryl, pentanoyl, hexanoyl, heptanoyl or octanoyl groups.
5. A method to prepare a poly alpha-1,3-glucan ester film comprising:
(a) providing poly alpha-1,3-glucan mixed ester;
(b) contacting the poly alpha-1,3-glucan ester of (a) with a solvent to make a solution of the poly alpha-1,3-glucan mixed ester;
(c) applying the solution of the poly alpha-1,3-glucan mixed ester on a surface; and
(d) allowing the solvent to evaporate to provide the poly alpha-1,3-glucan mixed ester film.
6. The method of claim 5 , wherein the poly alpha-1,3-glucan mixed ester comprises two or more of acetate, propionyl, butyryl, pentanoyl, hexanoyl, heptanoyl or octanoyl groups.
7. The method of claim 5 , wherein the solvent is acetone.
8. The film of claim 1 wherein the mixed ester comprises two or more of acetate, propionyl and butyryl groups.
9. A film comprising poly alpha-1,3-glucan ester having at least one of:
(a) a tear resistance of at least about 0.1 gf/mil; or
(b) a haze of less than about 20%,
wherein the degree of substitution is up to about 2.80.