| http://www.w3.org/ns/prov#value | - erent and denote H, methyl or ethyl and M is a water soluble cation or H, and wherein repeat unit (i) comprises the structure ##STR3## wherein R3 is a lower alkyl (C1 -C3), R4 is a hydroxy substituted alkyl or alkylene group having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene group having from 1 to about 6 carbon atoms, X is an anionic radical, Z is H, hydrogen atoms or a
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