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US 2020/0347152 A1Published application
Preparation of poly alpha-1,3-glucan esters using cyclic organic anhydrides
AssigneeDupont Industrial Biosciences USA, LLC
InventorsJayme L. Paullin, Rakesh Nambiar, Christian Peter Lenges
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Abstract
Poly alpha-1,3-glucan ester compounds are disclosed herein with a degree of substitution of about 0.001 to about 3.0. Also disclosed are methods of producing poly alpha-1,3-glucan ester compounds using cyclic organic anhydrides.
Claims14
1-15. (canceled)
A composition comprising a poly alpha-1,3-glucan ester compound represented by the structure:
- wherein
- (i) n is at least 6;
- (ii) each R is independently an —H or a first group comprising —CO—Cx—COOH, wherein the —Cx— portion of said first group comprises a chain of 2 to 6 carbon atoms, and further wherein the —Cx— portion comprises (a) at least one double-bond in said chain, and/or (b) at least one branch comprising an organic group;
- and
- (iii) the compound has a degree of substitution with the first group of about 0.001 to about 3.0.
2 more elements
A method of producing a poly alpha-1,3-glucan ester compound, the method comprising:
- contacting poly alpha-1,3-glucan in a reaction with a cyclic organic anhydride, thereby producing a poly alpha-1,3-glucan ester compound represented by the structure:
- wherein
- (i) n is at least 6;
- (ii) each R is independently an —H or a first group comprising —CO—Cx—COOH, wherein the —Cx— portion of said first group comprises a chain of 2 to 6 carbon atoms;
- and
- (iii) the compound has a degree of substitution with the first group of about 0.001 to about 3.0;
- and further wherein:
- (a) the reaction initially consists of the poly alpha-1,3-glucan and cyclic organic anhydride, and the cyclic organic anhydride is melted;
- or
- (b) the poly alpha-1,3-glucan and poly alpha-1,3-glucan ester are each in a solid form during the reaction.
7 more elements
Dependencies are inferred from the claim text.