| http://www.w3.org/ns/prov#value | - polyvinylammonium compound, with the proviso that the fraction of the H- containing monomer units having index I is within a range of from 1 to 100 mole %, relating to all the monomer units having index I, and that the fraction of the CHO-containing monomer units having index I is within a range of from 99 to 0 mole %, R 3 is a radical selected from the group comprising saturated carboxylic acids
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