Agfa Gevaert Nv

Agfa-gavaert N.v.

Jacques L Vervecken

Hubert Vandenabeele

Joan T Vermeersch

Daniel M Timmerman

The present invention provides a method of hardening a proteinaceous layer of a photographic silver halide element by incorporating a modified dextran in said proteinaceous layer, said modified dextran being the reaction product of dextran and an alkyl haloformate, a substituted alkyl haloformate, an aryl haloformate, or a substituted aryl haloformate. The invention also provides a photographic element comprising a said reaction product in at least one proteinaceous silver halide emulsion layer and/or in another proteinaceous layer coated thereon.

Photographic proteinaceous layers comprising dextran derivatives

The present invention relates to photographic elements comprising a support and on one or on both sides of said support in the given order at least one photosensitive silver halide emulsion layer and at least one protective hydrophilic colloid layer comprising finely divided solid spherical beads having an average size ranging from 0.5 to about 20 .mu.m, said beads comprising at least one photographically inert hydrophobic polymeric resinous material and, distributed throughout said resinous material, at least one water-insoluble wax, in a ratio by weight ranging from 10:0.1 to 10:5. The present invention also relates to a method of making such photographic elements.

Photographic silver halide element having a protective layer comprising

The present invention provides a method of hardening a proteinaceous surface layer of a photographic silver halide element by incorporating a dextran derivative in said proteinaceous surface layer, said dextran derivative being the reaction product of dextran and an epihalohydrin. The invention also provides a photographic element comprising at least one silver halide emulsion layer and at least one proteinaceous surface layer comprising the reaction product of dextran and an epihalohydrin.

Photographic surface layers comprising dextran derivatives

Photographic protective layer comprising beads of resinous material and

Photographic elements comprising at least one protective hydrophilic colloid layer comprising at least one urethane of polyethylene oxide compounds as antistatic agent in the form of dispersed droplets having an average diameter ranging from 1500 to 12000 nm and method of covering such photographic elements with at least one such protective hydrophilic colloid layer obtained by the steps of dissolving such urethane in a water-immiscible solvent medium, emulsifying the resulting solution in aqueous hydrophilic colloid, removing said water-immiscible solvent medium by evaporation to form the dispersed droplets in the aqueous hydrophilic colloid, and coating the latter as such or after having been mixed with additional hydrophilic colloid to form the protective hydrophilic colloid layer.

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Berchem, Belgium

Jacques L Vervecken