Patent ID: 6969744

Claim:
A compound of the formula: wherein: R 1 and R 2 are independently in each â€”(CR 1 R 2 )â€” unit selected from the group consisting of hydrogen and alkyl from C 1 to C 6 carbon atoms; m is an integer from 1 to 20; and X is selected from the group consisting of hydrogen, alkyl, aryl, alkaryl, alkoxy, heteroaryl, nitro, ureido, â€”OC(O)R 3 , â€”C(O)R 4 , â€”C(O)OR 5 , â€”C(O)NR 6 R 7 , â€”P(R 8 ) 3 , â€”P(OR 9 ) 3 , â€”SR 10 , â€”OSO 3 R 11 , and â€”S(O)R 12 ; wherein R 3 is alkyl or alkenyl; and R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , and R 12 are alkyl; and n is an integer from 0 to 2000.