Patent ID: 7662801

Claim:
A monolithic transparent film comprising a biodegradable oxidized cellulose ester, said oxidized cellulose ester having the following general formula I or II, wherein said film is modified from an oxidized cellulose having a carboxyl content from 3% to 25%: wherein: X is selected from the group consisting of H, Na, K, Ca, NH 4 , and Net 3 H; whereby R is (CH 2 ) n COOH, where n is 2 to 4; w is 0.1-1.0; x is 0.1-2.0; and n is 30-1500; and wherein: X is selected from the group consisting of H, Na, K, Ca, NH 4 , and NEt 3 H; R′ and R″ are each selected from the group consisting of: H; CF 3 ; (CH 2 ) n CH 3 , where n is from 0 to 18; (CH 2 ) n COOH, where n is from 1 to 8; CY═CZCOOH, where Y and Z are independently selected from the group consisting of hydrogen, methyl, branched alkyl having from 1 to 20 carbon atoms and from one to three cis or trans double bonds; branched alkenyl having from 1 to 20 carbon atoms and having from one to three cis or trans double bonds; CY—CH 2 , where Y is H, methyl, or phenyl; CH═CHY, where Y is C 6 H 5 ; CH═CYCOOH, where Y is H or CH 3 ; (CH 2 ) 8 CH═CH(CH 2 ) 8 CH 3 ; or C 6 H( 2-6 )(COOH) 0-4 , CH 2 CH(COOH)CH 2 —COOH; w is 0.1-1.0; x′ is 0.1-1.9; y is 0.1-1.9; and n is 30-850.