Patent ID: 7786249

Claim:
A polymer comprising at least one of L1 blocks and at least one of L2 blocks, having the following formula wherein a) L1 is a linkage with the following formula wherein Y and Z are independently selected from the following moieties provided that if Y and Z are the same, they are not and wherein the symbol “•” indicates the position at which Y or Z attaches to the phenyl ring of L1; b) L2 is a linkage with the following formula wherein Y and Z are independently selected from the following moieties provided that if Y and Z are the same, they are not and wherein the symbol “•” indicates the position at which Y or Z attaches to the phenyl ring of L2, c) T represents the same or different biocompatible polymeric or non-polymeric linkage comprising from 1-100 atoms; d) j ranges from 2 to 30; e) k ranges from 6 to 460; f) l ranges from 0.005 to 2.0; g) m is 1; h) n ranges from 20 to 600; i) the weight average molecular weight of the polymer ranges from 38,000 to 188,000 Daltons.