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| - The acrylamide containing polymers in said U.S. Pat. No. 4,529,782 (Fan et al.) are of the following formula: ##STR1## wherein R, R1 and R3 are independently hydrogen or methyl, R2 + is an alkali metal ion, such as Na+ or K+, R4 is OR5, where R5 is an alkyl group having up to 5 carbon atoms, ##STR2## wherein R7 is either methyl, ethyl or butyl ##STR3## phenyl, substituted phenyl, CN, or ##STR4## a
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