Patent ID: 8735570

Claim:
A dextran polymer derivative comprising: (a) an ester-linked amine-containing substituent, selected from and mixtures thereof, wherein R 1 is selected from C 1 , C 2 , C 3 , or C 4 alkyl groups, R 2 and R 3 may be the same or different and are selected from hydrogen, methyl and ethyl groups, and R 4 , R 5 , and R 6 may be the same or different and are selected from methyl and ethyl groups, and wherein the degree of substitution of said ester-linked amine-containing substituent is at least 0.03; and (b) an alkyl ester substituent selected from acetate, propionate, and mixtures thereof, wherein the degree of substitution of said alkyl ester substituent is at least 0.05.