Patent ID: 7259224

Claim:
A conjugate prepared by conjugating a polymer having the formula of: X—O—{[(R l —O) a —CO 2 —] h —[(R 2 —O) b —CO 2 —] i } m —{[(R 3 —O) c —CO 2 —] j —[(R 4 —O) d —CO 2 —] k }—(R 5 —O) e —Y wherein: R 1 , R 2 , R 3 , R 4 , and R 5 are alkylene; a, b, c, d, and e arc integers of from about 5 to 500; h, i, j, and k are integers of from 0 to about 100, and the sum of h, i, j, and k is from about 5 to 100; m is an integer of from about 2 to 100; and X and Y are independently selected from the group consisting of hydrogen, alkyl, alkenyl, aryl , and reactive moieties, to a biologically active agent.