Patent ID: 7700541

Claim:
A polymer comprising a recurring unit selected from the group consisting of formula (I): wherein: PEI is a polyethyleneimine recurring unit having a molecular weight less than 600 Daltons; R is selected from the group consisting of an electron pair, hydrogen, C 2 -C 10 alkyl, C 2 -C 10 heteroalkyl, C 5 -C 30 aryl, and C 2 -C 30 heteroaryl; L is selected from the group consisting of C 2 -C 50 alkyl, C 2 -C 50 heteroalkyl, C 2 -C 50 alkenyl, C 2 -C 50 heteroalkenyl, C 5 -C 50 aryl, C 2 -C 50 heteroaryl, C 2 -C 50 alkynyl, C 2 -C 50 heteroalkynyl, C 2 -C 50 carboxyalkenyl and C 2 -C 50 carboxyheteroalkenyl; and m is an integer in the range of about 1 to about 30.