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  • 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 i.e. units of the formula ##STR5## with about 0.5 to about 90 percent, based upon the number of hydroxyl groups in said polyvinyl alcohol, of an isocyanate of the formula ##STR6## wherein R1, A1, R2
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