Eastman-kodak Company

Siu C Tsoi

Peter J Twist

Jacques Roussilhe

David T Southby

John Demita Goddard

Paul L Stanley

Paul C Ward

Llewellyn J Leyshon

Michael Ridgway

Nigel E Milner

Paul R Buckland

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

A class of pyrazolidone compounds suitable for use as electron transfer agents in photographic development comprises pyrazolidones substituted in the 1-position by an aromatic group that is substituted in the ortho, meta or para position by --O--CO--R, wherein R is a monovalent organic group having up to 24 carbon atoms. This ester group is hydrolyzable in an alkaline developer solution, thereby deactivating the electron transfer agents after a period of time and reducing the contamination effect of seasoning into the developer solution. Photographic recording materials can be developed in reactive association with the electron transfer agent. The electron transfer agent can be present in the photographic recording materials, or in develper solutions.

Auxiliary developing agents, photographic materials incorporating them

The present invention concerns an organic/inorganic developer composition comprising a regeneratable iron chelate, novel codevelopers of the phenidone type including one or more solubilizing groups that are not directly attached to the phenyl nucleus or to the pyrazolidino nucleus and optionally ascorbic acid. These compositions are particularly useful for the black-and-white development of films or photographic papers, in particular for the fast development of radiographic products.

Organic/inorganic developer composition

A new fogging photographic processing solution for a reversal process comprises a compound (I) and a bi-nucleophilic agent. Compound (I) corresponds to the following formula: ##STR1## wherein A is a group capable of being adsorbed to the silver halide surface, L is a linking group and r is 0 or 1, R.sub.1 and R.sub.2 are independently selected from an alkyl group, substituted or unsubstituted, and an aryl group substituted or unsubstituted. A process of producing a positive image by imagewise exposure of a reversal silver halide material comprises contacting the material with the above fogging solution or by imagewise exposure of such a material containing a compound (I) and contacting the material with a solution comprising a bi-nucleophilic agent.

Fogging solution for a reversal process

Auxiliary development agents photographic materials incorporating them

The present concerns compounds of the 3-pryazolidone type comprising solubilizing groups which are not directly attached to the phenyl ring or to the pyrazolidino ring. These compounds can be used as co-developing agents in the development of black and white photographic products.

3-pyrazolidone compounds and photographic developer solutions containing

A class of pyrazolidone compounds suitable for use as electron transfer agents in photographic development comprises pyrazolidones substituted in the 1-position by an aromatic group that is substituted in the ortho, meta or para position by -O-CO-R, wherein R is a monovalent organic group having up to 24 carbon atoms. This ester group is hydrolyzable in an alkaline developer solution, thereby deactivating the electron transfer agents after a period of time and reducing the contamination effect of seasoning into the developer solution. Photographic recording materials can be developed in reactive association with the electron transfer agent. The electron transfer agent can be present in the photographic recording materials, or in develper solutions.

The present invention concerns a developer for silver halide photographic products comprising a co-developing agent of the 1-phenyl-3-pyrazolidinone type. These co-developing agents comprise solubilizing groups which are not attached directly to the phenyl ring or the pyrazolidine ring, and improve the stability of the developer composition.

Photographic developing composition

The invention provides a color photographic material comprising at least one silver halide emulsion layer having associated therewith a dye image-forming coupler and which contains in a layer thereof an ETA (electron transfer agent) releasing compound of the general formula: ##STR1## wherein R.sup.1 is an alkyl group,

Photographic silver halide color material

A method for making a photographic silver halide developer composition, preferably immediately before use, by electrolysing an aqueous medium containing a developing agent precursor composition which forms or releases a silver halide developing agent at an electrode upon electrolysis.

Method of making a photographic developer solution

This invention provides a color photographic element comprising, in an adjacent silver halide emulsion layer,

Photographic silver halide color materials with sulfonylhydrazine color

A non-diffusible, yellow dye image-forming benzoylacetanilide coupler having an aryloxy coupling-off group where (a) the benzoyl group comprises a substituent R.sup.1 O-- wherein R.sup.1 is an alicyclic or aliphatic, unsubstituted or substituted, branched or unbranched hydrocarbon group; and, (b) at least one of the benzoyl group and acetanilide group comprise a substituent that comprises a branched alkyl group containing at least 4 carbon atoms wherein the alkyl chains are uninterrupted or interrupted by hetero atoms or groups, enables improved solubility in coupler solvents in a photographic material, and the yellow dyes resulting from such couplers upon oxidative coupling have improved light stability. Such couplers are advantageous in photographic silver halide elements and processes.

Benzoylacetanilide photographic yellow dye image-forming couplers and

Novel photographic acetanilide dye-forming couplers comprise a group comprising a stabilizer moiety represented by the formula: ##STR1## wherein R is halogen or alkoxy having 1 to 4 carbon atoms; R.sub.1 is hydrogen, halogen, alkyl or alkoxy; R.sub.2 and R.sub.3 are individually alkyl; and, X is a linking group. Such couplers provide advantageous stability in dyes formed from the couplers. These couplers are useful in photographic silver halide materials and processes.

Growing community of inventors

Watford, United Kingdom

Siu C Tsoi