Patent ID: 7939664

Claim:
The reactive compound: wherein: X— is a counterion; X 1 is —O— or —NH—; X 2 is —O— or —NH—; L is a divalent linking group comprising a direct bond or a lower alkylene having 1 to 8 carbon atoms, optionally terminated with or interrupted by one or more divalent connecting groups selected from the group consisting of sulfonamide (—SO 2 NH—), amide —(C═O)N—, ester —(C═O)—O—, ether —O—, sulfide —S—, sulfone (—SO 2 —), phenylene —C 6 H 4 —, urethane —NH(C═O)—O—, urea —NH(C═O)NH—, thiourea —NH(C═S)—NH—, amide —(C═O)NH—, and amine —NR—, where R is defined as alkyl having 1 to 6 carbon atoms; and Z is either a reactive, ethylenically unsaturated group or a reactive functional group, capable of forming a covalent bond with a polymer or matrix.