Photographic film units containing a polymeric mordant which covalently bonds with certain dyes

Claim 1

A photographic element comprising a support; a layer comprising silver halide emulsion; and a layer containing non-uniformly and imagewise the reaction product of (a) a photographically useful and/or active fragment having appended thereto a moiety selected from the group consisting of ZNHR, --SO 2 NHR and ##STR88## wherein R is H or alkyl and Z is selected from the group consisting of alkylene, arylenealkylene, cycloalkylene and with R can be taken together with the NH to complete an N containing heterocyclic group and (b) a polymeric mordant, wherein said polymer contains recurring units having the formula selected from the group consisting of ##STR89## wherein R 2 is H or alkyl; R 1 is H, alkyl or aryl; L is a bivalent linking group providing a linkage between the vinyl group and W selected from the group consisting of alkylene, arylene, arylenealkylene, COOR 3 and CONHR 3 ; R 3 is selected from the group consisting of alkylene, arylene and arylenealkylene; W is an electron withdrawing group selected from the group consisting of SO 2 , CO, ##STR90## m is 1 or 2; n is 0 or 1; with the proviso that when n is O, W is SO 2 or ##STR91## and X is a leaving group which can be displaced by nucleophiles or eliminated in the form of HX by treatment with base; wherein said reaction product is formed (a) by displacement of X by said moiety in recurring unit (1), or (b) by addition of said moiety to the double bond of recurring unit (2).