Patent ID: 7879994

Claim:
A cellulose ester interpolymer wherein the C2 and C3 positions of each of the anhydroglucose units of the cellulose ester interpolymer are in the alcohol oxidation state, and consisting of anhydroglucose units as the non-terminal monomer units of said cellulose ester interpolymer, wherein R 1 , R 2 , R 3 , R 4 , and R 5 are independently selected from the group consisting of hydrogen and C 2 -C 12 acyl groups, wherein at least one of R 1 , R 2 , R 3 , R 4 , and R 5 is a C 2 -C 12 acyl group; and, X is carboxy, wherein the acid number of said cellulose ester interpolymer is greater than 10.