Patent ID: 6878374

Claim:
A polymer comprising recurring units represented by formula (I): wherein X is selected from the group consisting of C(O)OR 1 , C(O)SR 1 , C(O)NR 1 R 2 , and VZ, where R 1 and R 2 are each individually selected from the group consisting of hydrogen, C 1 to C 10 alkyl, and C 6 to C 10 aryl, where V is a labile linker group, and where Z is selected from the group consisting of poly(ethyleneimine), poly(propyleneimine), poly(lysine), PAMAM dendrimer, octaamine dendrimer, and hexadecaamine dendrimer; and wherein Y is selected from the group consisting of —(CH 2 ) 2 —, —(CH 2 ) 2 —O——(CH 2 ) 2 —, —(CH 2 ) 2 —O—(CH 2 ) 2 —O—(CH 2 ) 2 —, and —(CH 2 ) 3 —NHC(O)—(CH 2 ) 6 —C(O)NH—(CH 2 ) 3 —.