Patent ID: 6841640

Claim:
A polymer conforming to the following structure; wherein; R″ is selected from the group consisting of CH 3 and H; a is an integer from 2 to 100; b, c, d, e and f are integers ranging from 0 to 100; R 1 is —CH 2 —O—(CH 2 CH 2 O) S —(CH 2 CH(CH 3 )O t —(CH 2 CH 2 O) u —P—(O)—(OH) 2 s, t and u are independently integers ranging from 0 to 20; R 2 is —C(O)—O − M + M is selected from H, Na, K, Li, and NH 4 ; R 3 is R 4 is R 10 , R 11 and R 12 are selected from H, methyl and ethyl; R 5 is —C(O)—NH 2 R 6 is —C(O)—N(H)—(CH 2 ) q —SO 3 − M + q is an integer ranging from 1 to 5.