Copolymer latex and photographic silver halide materials containing such latex

A photographic silver halide material comprising a support and at least one light-sensitive silver halide emulsion layer wherein said layer and/or a hydrophilic colloid layer in water-permeable relationship therewith comprises a copolymer incorporated therein from an aqueous dispersion of a copolymer comprising recurring units of a monomer which includes a photographically useful group, that plays a chemical role in the preparation, storage and/or processing of a photographic silver halide emulsion material, or defines thereof at least partly the spectral absorption characteristics, and recurring units of an ionogenic surface active monomer, characterized in that the said ionogenic monomer corresponds to the following general formula:

• ##STR23## wherein:
• R.sup.1 is hydrogen or methyl,
• n is 0 or an integer from 1 to 20,
• L is a trivalent linking moiety selected from the group consisting of --CONHCH<, --CON<, ##STR24## R.sup.2 is hydrogen or an aliphatic branched or unbranched saturated or unsaturated hydrocarbon group,
• R.sup.3 is a monovalent chemical bond or a bivalent aliphatic hydrocarbon group or such group interrupted by the group --COO-- or --CONR-- wherein R is hydrogen or a C.sub.1 -C.sub.4 alkyl group, and
• Y is a hydrophilic group selected from sulpho, sulphato and phosphono in acid or salt form, and wherein at least one of the groups represented by --(CH.sub.2).sub.n --, R.sup.2 and R.sup.3 is or contains a hydrocarbon chain of at least 8 C-atoms.