Patent ID: 8883211

Claim:
A heterofunctional polyoxazoline of the following general structure: E-R 3 -{POZ I —POZ II } a —S—R* wherein: E is —OH, —CO 2 H or a group containing an active —OH group or an active —CO 2 H group; POZ I is a polyoxazoline polymer of the structure [N(CO—R′—Z)CH 2 CH 2 ] m POZ II is a polyoxazoline polymer of the structure [N(COR 2 )CH 2 CH 2 ] n R′ is an optional linking group R 3 is a linking group; Z is an active functional group or a group capable of being converted to an active functional group, the active functional group capable of forming a linkage with a binding partner on a target molecule; R 2 is independently selected for each repeating unit of the polyoxazoline polymer from an unsubstituted or substituted alkyl, alkenyl, aralkyl or heterocycylalkyl group; R* is —(CH 2 ) q —C 6 H 5 and q is an integer from 1-25; n is an integer from 0-1000, provided that when n=0, then m is >1; m is an integer 1-1000; and a is ran, which indicates a random copolymer, or block, which indicates a block copolymer.