Patent ID: 8691284

Claim:
A block co-polymer of formula: wherein: R 14 is H, alkyl, alkenyl, or a water-soluble group; Q comprises a glutamic acid side chain, a aspartic acid side chain, a tyrosine side chain, a serine side chain, a threonine side chain, a lvsine side chain, a ornithine side chain, a histidine side chain, or an N-(3-hydroxypropyl)aspartamide side chain; L is a bond; an alkylene; —O—; —C(O)—; —C(O)N(R 1 )(CH 2 ) n —; —N(R 2 )CO—; —C(O)O—; —C(O)O(CH 2 ) n —; —N(R 3 )C(O)O—; —N(R 4 )C(O)O(CH 2 ) n —; —OC(O)N(R 5 )(CH 2 ) n —; or N(R 6 )C(O)N(R 7 )(CH 2 ) n —; R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are each independently H or alkyl; n is 0 or greater Y is O, NH, or NC(O)alkyl; X is NR 18 ; R 18 is H or alkyl; m and p are repeat block units in the polymer; q is from 1 to 20; and r is 0, 1, 2, or 3.