Unsaturated polymers of heterocyclic olefins

Abstract From the Canadian patent

Unsaturated Polymers of Heterocyclic Olefins Abstract of the Disclosure, Polymers having repeating units of the general formula I (I), where Y and Z are the same or different and each denote -H -COOR1 or -CON(R2)R3, with the proviso that Y and Z do not both denote -H or Y and Z together with the carbon, atoms to which they are attached denote a divalent cyclic group of formula (II), A denotes -O- or -N(R4)-, R1 denotes -H C1-C4 alkyl or C2-C4 hydroxyalkyl, R2 and R3 each denote -H, C1-C4 alkyl or C1-C4 hydroxyalkyl and R4 denotes -H, -OH, C1-C4 alkyl, C1-C4 hydroxyalkyl or C1-C4 alkoxy. The carboxyl-containing polymers are useful in water treatment.