Cationic poly alpha-1,3-glucan ethers
AssigneeE. I. Du Pont de Nemours and Company
InventorsT. Joseph Dennes, Andrea M. Perticone, Jayme L. Paullin
Life of this patent
Estimating the term…
Abstract
Poly alpha-1,3-glucan ether compounds are disclosed herein comprising positively charged organic groups. The degree of substitution of the ether compounds is about 0.05 to about 3.0. Also disclosed are methods of producing poly alpha-1,3-glucan ether compounds having positively charged organic groups, as well as methods of using these ether compounds for increasing the viscosity of a aqueous compositions. Hydrocolloids and aqueous solutions comprising the ether compounds are also disclosed.
Claims21
A composition comprising a poly alpha-1,3-glucan ether compound represented by the structure:
- wherein
- (i) n is at least 6,
- (ii) each R is independently an H or a positively charged organic group, and
- (iii) the compound has a degree of substitution of about 0.05 to about 3.0.
A method of producing a poly alpha-1,3-glucan ether compound, the method comprising:
- (a) contacting poly alpha-1,3-glucan in a reaction under alkaline conditions with at least one etherification agent comprising a positively charged organic group, wherein at least one positively charged organic group is etherified to the poly alpha-1,3-glucan thereby producing a poly alpha-1,3-glucan ether compound represented by the structure:
- wherein
- n is at least 6,
- (ii) each R is independently an H or the positively charged organic group, and
- (iii) the compound has a degree of substitution of about 0.05 to about 3.0;
- and
- (b) optionally, isolating the poly alpha-1,3-glucan ether compound produced in step (a).
A hydrocolloid or aqueous solution comprising a poly alpha-1,3-glucan ether compound represented by the structure:
- wherein
- (i) n is at least 6,
- (ii) each R is independently an H or a positively charged organic group,
- (iii) the compound has a degree of substitution of about 0.05 to about 3.0, and
- (iv) the hydrocolloid or aqueous solution has a viscosity of at least about 10 centipoise.
A method for increasing the viscosity of an aqueous composition, the method comprising:
- contacting a poly alpha-1,3-glucan ether compound with the aqueous composition, wherein the viscosity of the aqueous composition is increased by said compound,
- wherein said compound is represented by the structure:
- wherein
- (i) n is at least 6,
- (ii) each R is independently an H or a positively charged organic group, and
- (iii) the compound has a degree of substitution of about 0.05 to about 3.0.
A method of treating a material, said method comprising:
- contacting a material with an aqueous composition comprising a poly alpha-1,3-glucan ether compound represented by the structure:
- wherein
- (i) n is at least 6,
- (ii) each R is independently an H or a positively charged organic group, and
- (iii) the compound has a degree of substitution of about 0.05 to about 3.0.
Dependencies are inferred from the claim text.