| http://www.w3.org/ns/prov#value | - structure ##STR14## and wherein said repeat unit (b) comprises the structure ##STR15## wherein each R1 is independently H or lower alkyl (C1 -C3), R2 is OH or OM, M is a water soluble cation, R3 is 2-hydroxypropylidene, X is SO3, Z is H or a water soluble cation, p is 1, the molar ratio x:y of said polymer being between about 4:1 to about 1:5 wherein the number average molecular weight of said wat
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