Block copolymers including acrylonitrile sequences and sequences including units derived from glutarmide units and processes for preparing same

Abstract From the Canadian patent

There is disclosed novel block copolymers formed of acrylc nitrile sequences and sequences containing at least about 50 mole percent of acrylamide units and at most about 50 of units selected from the group consisting of carboxyl ester, amide, hydrazide and hydroxylamide units and formed by reacting a block copolymer having acrylonitrile sequences and sequences of glutarimide units with a low molecular weight compound having a functional group selected from the group consisting of hydroxyl primary amino, secondary amino, hydrazo and hydroxylamino group. The reaction is effected ata pH of about 7.5 and higher preferably, in the presence of a solvent and/or swelling agent.