| http://www.w3.org/ns/prov#value | - The polyvinyl alcohol polymer derivatives containing units of formula I are easily prepared by reacting a polyvinyl alcohol, having a weight average molecular weight of at least about 2,000, containing for example units of the formula ##STR5## with about 0.1 to about 90 percent, based upon the number of hydroxyl groups in said polyvinyl alcohol, of a hydroxyl reactive monomer of the formula ##STR6
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