Patent ID: 6852709

Claim:
A biodegradable polyphosphate having at least one phosphate group in the main chain of the polymer and the polymer having at least one positively charged or positively chargeable group and at least one hydrophobic moiety, wherein the polymer comprises repeat units of the formula: wherein A and B can be the same or different and are each independently selected from the group consisting of C 1-20 alkylene, C 3-20 cyclic alkylene, C 5-20 arylene, C 5-20 heteroarylene, C 3-20 cyclic heteroalkylene, a hydrophilic divalent linker group, and (CH 2 CH 2 O) x CH 2 CH 2 , such that A, B or both A and B comprise a positively charged or positively chargeable functional group in the mainchain and A, B or both A and B can be optionally substituted with one or more neutral or charged hydrophilic groups or hydrophobic groups: R 3 is C 1-20 alkyl, C 5-20 aryl, C 5-20 heteroaryl, C 3-8 heteroalicyclic, C 3-8 cycloalkyl, C 3-20 aralkyl or C 3-8 cycloalkyl C 1-20 alkyl; and each occurence of R 3 can be optionally substituted with one or more neutral or charged groups or one or more hydrophobic moieties; x is an integer between about 1 and about 100; m and n are independently selected non-negative integers; and m+n>1.