β-Elimination polymers useful for providing diffusion control layers in diffusion transfer photographic products

Claim 1

A polymer comprising recurring units having the formula ##STR45## wherein R is hydrogen, halogen or lower alkyl; R 1 is hydrogen or lower alkyl; R 2 and R 3 are independently hydrogen, lower alkyl, substituted lower alkyl, aryl, alkaryl, aralkyl, cycloalkyl, or R 2 and R 3 together with the carbon atoms to which they are bonded constitute a carbocyclic or heterocyclic ring, or R 3 , when substituted on the methylene carbon atom next adjacent the nitrogen atom, is taken together with R 1 to form part of a substituted or unsubstituted N-containing ring; and n is a positive integer one to six; and Z is a cyclic β-elimination moiety and having the formula ##STR46## wherein Y is ##STR47## A represents the atoms necessary with Y to complete a four- to seven-membered ring structure, and D and E are independently hydrogen, methyl or phenyl, provided that not more than one of D and E is methyl or phenyl, or said cyclic β-elimination moiety is a moiety having the formula ##STR48## wherein A and E together represent the atoms necessary to complete with the carbon atoms to which they are bonded a five-, six- or seven-membered ring structure, D is hydrogen, methyl or phenyl, and Y is an activating group for said β-elimination reaction.