Patent ID: 7304122

Claim:
A polymer of formula (VII) wherein m is about 0.1 to about 0.9; p is about 0.9 to about 0.1; n is about 50 to about 150; each R 1 is independently (C 2 -C 20 )alkyl; each R 2 is independently hydrogen, or (C 6 -C 10 )aryl(C 1 -C 6 )alkyl; each R 3 is independently hydrogen, (C 1 -C 6 )alkyl, (C 2 -C 6 )alkenyl, (C 2 -C 6 )alkynyl, or (C 6 -C 10 )aryl(C 1 -C 6 )alkyl; and each R 4 is independently (C 2 -C 20 )alkyl; that is linked to one or more drugs.