Agfa-gevaert

Agfa Gevaert Nv

Ralf Wirowski

Heinz Wiesen

Jan Haller

Ralf B&uuml;scher

Peter Bergthaller

Hans-Ulrich Borst

Stefan Herrmann

Peter Bell

Lothar Rosenhahn

G&uuml;nter Helling

J&ouml;rg Hagemann

Heinrich Odenw&auml;lder

J&ouml;rg Siegel

Detlev Kapitza

J&uuml;rgen Jung

A color photographic silver halide material having a support, which material comprises at last one blue-sensitive, yellow-coupling silver halide emulsion layer and at least one green-sensitive, magenta-coupling silver halide emulsion layer and at least one red-sensitive, cyan-coupling silver halide emulsion layer, and which contains at least one masking coupler which has two chromophores which absorb in the wavelength range from 420 to 750 nm and are eliminable or decolorizable by coupling with the developer oxidation product, is distinguished by improved sensitivity associated with undiminished color purity.

Color photographic silver halide material

A color photographic silver halide material, which has a support which comprises at least one blue-sensitive, yellow-coupling silver halide emulsion layer nearest the light source and at least one green-sensitive, magenta-coupling silver halide emulsion layer and at least one red-sensitive, cyan-coupling silver halide emulsion layer which are further from the light source than is the at least one blue-sensitive layer, and which contains at least one cyan masking coupler which has its maximum absorption above 650 mn, the red-sensitive layers have their maximum sensitivity at 620&plusmn;20 nm and the absorption of the masking coupler at the maximum sensitivity of the red-sensitive layers is at most 70% of its absorption at 690 mn, is distinguished by improved color reproduction and color saturation in the magenta layer without loss of sensitivity.

A color photographic recording material having at least one spectrally sensitized silver halide emulsion layer, characterized in that said silver halide emulsion layer contains an oil former having a pKa value of less than 18 and a DIR coupler and the material contains at least one color coupler, wherein the color coupler and/or the DIR coupler have specific structures, is distinguished by an increased interimage effect in comparison with the prior art without sensitivity being reduced.

The production of tabular silver bromide-iodide emulsions and silver bromide-chloride-iodide emulsions with an aspect ratio,, an iodide content from 1 to 40 mol % and a chloride content from 0 to 20 mol %, by the process steps of (a) silver halide nucleus precipitation, and (b) at least one further precipitation of silver halide, wherein rein at least one aromatic five- or six-membered, heterocyclic compound, which is free from&mdash;SH&mdash;,&mdash;SSO,H&mdash; and&mdash;SSO,R groups, is added in an amount from 10,to 10,mol/mol silver during nucleus precipitation or during the precipitation of an inner zone of the silver halide grain which is different from the nucleus precipitate, results in an improved speed/grain size ratio and in an increased stability of a photographic material which contains an emulsion produced in this manner.

Production of silver halide emulsions

A colour photographic silver halide material having a support and at least one photosensitive silver halide emulsion layer which contains a magenta coupler of the formula (I)

Growing community of inventors

Kö'ln, Germany

Ralf Wirowski