PREPARATION OF POLY ALPHA-1,3-GLUCAN ESTERS AND FILMS THEREFROM
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;
(b) a tensile strength of at least about 10 kg/mm 2 ; or
(c) a haze of less than about 20%.
2 . The film of claim 1 , wherein the poly alpha-1,3-glucan ester used is poly alpha-1,3-glucan acetate.
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;
(b) a tensile strength of at least about 200 kg/mm 2 ; or
(c) a haze of less than about 10%.
4 . The film of claim 3 , wherein the poly alpha-1,3-glucan ester used is poly alpha-1,3-glucan acetate.
5 . A method to prepare a poly alpha-1,3-glucan ester film comprising:
(a) providing poly alpha-1,3-glucan ester;
(b) contacting the poly alpha-1,3-glucan ester of (a) with a solvent to make a solution of poly alpha-1,3-glucan ester;
(c) applying the solution of poly alpha-1,3-glucan ester on a surface; and
(d) allowing the solvent to evaporate to provide the poly alpha-1,3-glucan ester film.
6 . The method of claim 5 , wherein the poly alpha-1,3-glucan ester used is poly alpha-1,3-glucan acetate.
7 . The method of claim 5 , wherein the solvent is acetone.