Patent ID: 7511094

Claim:
A polymer having the structure: wherein: POLY is a water-soluble polymer segment; Xâ€² is a linker moiety, zâ€² is an integer from 3 to about 21; R 1 , in each occurrence, is independently H or an organic radical selected from the group consisting of alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, and substituted aryl; R 2 , in each occurrence, is independently H or an organic radical selected from the group consisting of alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aryl, and substituted aryl, W a and W b are each independently O or S, and R 3 and R 4 are each independently H, or an organic radical selected from the group consisting of methyl, ethyl, isopropyl, benzyl, 1,1,1-trichloroethyl, and nitrobenzyl, or when taken together, are â€”(CH 2 ) 2 â€” or â€”(CH 2 ) 3 â€”, forming a 5 or 6 membered ring when considered together with W a , C 1 , and W b .