Agfa Gevaert Nv

Arthur Henri De Cat

Daniel M Timmerman

Walter F De Winter

Robert J Pollet

Francis J Sels

Valere Frans Danckaert

Godfried A Kockelbergh

Abrasion marks by dry-friction and the tendency of producing pressure-scratches in photographic materials is reduced by incorporating in the gelatin silver halide emulsion layers polymeric compounds containing recurring units with semicarbazone or alkoxy carbonyl hydrazone groups in the side-chains. These recurring units are represented by one of the formulae: ##STR1## wherein: A is a single bond or --CONH-alkylene-, --COO-alkylene-, or phenylene,

Photographic elements in which gelatin silver halide layers contain

Proteinaceous materials, especially gelatin, are hardened by incorporating therein at least one bis-epoxy compound corresponding to one of the formula: ##STR1## wherein: X represents a 1,4-piperazinylene group or a monomethyl or dimethyl-substituted 1,4-piperazinylene group, or represents a 1,2-pyrazolidinylene group,

Hardening of proteinaceous materials

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Mortsel, Belgium

Arthur Henri De Cat