| http://www.w3.org/ns/prov#value | - The acidic vinyl monomer comprises a compound having the structure ##STR10## where Ar is phenylene or naphthylene, R1 is H or CH3, R2 is H or C1 -C6 alkyl, R3 is C2 -C6 alkylene, and R4 is --COOH or --SO3 H. Methacrylic acid and acrylic acid are especially preferred, methacrylic acid being most preferred.
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