Eastman-Kodak Company

John Demita Goddard

Llewellyn J Leyshon

Peter J Twist

Philip J Coldrick

Stephen P Singer

James A Friday

Bernard A Clark

Louis Elbert Friedrich

Danuta Gibson

Paul L Stanley

Philip A Allway

Nigel E Milner

Marcello Vitale

Dawn J Jenkins

Rebecca Glen

Brian Thomas

David T Clarke

Jacques Roussilhe

Siu C Tsoi

Paul R Buckland

Judith A Bogie

Method for developing a high contrast photographic material containing a polyhydrazide nucleating agent

High contrast photographic element containing a polyhydrazide nucleating agent

A photographic aqueous processing solution containing at least one solid compound that has a maximum solubility therein corresponding to a desired operating level, which solution is kept in equilibrium with the solid form of the compound, thus maintaining its concentration at the desired level without the need for a replenishing system.

Photographic processing solutions

Disclosed is a color photographic element comprising at least one of (1) a light sensitive silver halide emulsion layer and (2) a non-silver containing light insensitive layer, said at least one layer containing a compound with a minimum of three heteroatoms that does not react with oxidized developer and that has a ClogP sufficient to increase the photographic speed of said element compared to the same element without the compound. The invention provides improved light sensitivity.

Color photographic element containing speed improving compound

High contrast photographic element containing a novel nucleator

The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterized in that the nucleating agent is a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises an acylhydrazide moiety and a nicotinamide moiety in combination, the material providing unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog.

The present invention provides a photographic element comprising a support bearing a light-sensitive silver halide emulsion layer in association with an image dye-forming coupler and having associated therewith a compound of general formula

Photographic addenda

The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterised in that the nucleating agent is a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises an acylhydrazide moiety and a nicotinamide moiety in combination, the material providing unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog.

The present invention relates to a silver halide photographic element comprising a dye-forming coupler of formula (I) ##STR1## wherein R.sup.1 is selected from an alkyl group, an aryl group, a 5-10 membered heterocyclic group containing one or more O, N or S atoms, each of which groups is unsubstituted or substituted, or a substituted amino group;

Image dye-forming couplers and photographic elements containing them

Color photographic elements, especially color photographic papers, can be more rapidly color developed (up to 25 seconds) in the presence of a color developing solution containing a selectively diffusible color development photochemical such as a development inhibitor. Despite the shortened processing time, color balance within the three color records of such elements is maintained. The selectively diffusible color development photochemical has size and structure that enables it to have sufficient solubility in the color developing composition, and to selectively diffuse into the topmost red-sensitive emulsion layers of the processed color papers only.

Method for rapid photographic processing with maintained color balance

Method of synthesizing a 2-substituted nitrogen-containing compound

A photographic element, and coupler employed therein, comprises a photographic silver halide emulsion layer containing a yellow dye-forming coupler having a the general formula: ##STR1## wherein Z is a ballasted group which splits off on silver halide development which is of such size and configuration to render the coupler non-diffusible in photographic layers, prior to splitting off, and R.sup.1 and R.sup.2 are each individually an alkyl or aryl group whose combined effect is to render the yellow dye formed on coupling sufficiently mobile to produce image smearing.

Photographic color couplers and photographic materials containing them

Photographic materials having incorporated sulphonyhdrazide color developing agents. Such photographic materials have at least two color-forming units, each of which has a silver halide emulsion layer and a photographic coupler. A ballasted heterocyclic sulphonhydrazide color developing agent is present in the material in droplets of a high boiling point solvent. A method of forming a photographic color image using such materials is also provided.

Growing community of inventors

Pinner, United Kingdom

John Demita Goddard