Patent ID: 8722847

Claim:
A polymer comprising non-degradable blocks and degradable blocks, wherein said polymer has the structure of Formula (Ia): wherein t, m, p, q and r are positive integers, and n is a positive integer; and R, R 1 , R 2 , R 3 , R 4 , and R″ are independently selected in each structural unit from the group consisting of H, substituted alkyl, unsubstituted alkyl, substituted heteroalkyl, unsubstituted heteroalkyl, substituted cycloalkyl, unsubstituted cycloalkyl, substituted heterocycloalkyl, unsubstituted heterocycloalkyl, substituted aryl, unsubstituted aryl, substituted heteroaryl, unsubstituted heteroaryl, substituted alkoxy, unsubstituted alkoxy, ester, nitro, amine, amide, and thiol, wherein m has the value of 1, 2, 3 or 4.