US 4,426,441 A · Dye-forming developers in an imaging material and process

Abstract

In a dye-forming imaging material comprising (a) a dye-forming coupler, and (b) an organic reducing agent that is capable in its oxidized form of reacting with the dye-forming coupler to form a dye, improvements are provided by a reducing agent that is a ureidoaniline silver halide developing agent free of strong electron withdrawing groups. Such an imaging material can be a photographic silver halide material. The imaging material can be a photothermographic material for producing a dye image comprising, in reactive association, (a) photographic silver halide, (b) a dye-forming coupler, and (c) an oxidation-reduction image forming combination comprising (1) an organic silver salt oxidizing agent, and (2) an organic reducing agent for the organic silver salt oxidizing agent, wherein the reducing agent is a ureidoaniline which is capable in its oxidized form of reacting with the dye-forming coupler to form a dye. A thermographic material comprises the same combination of components without the need for photographic silver halide. A silver image and dye image are produced in such an exposed photothermographic material by heating the material until the silver image and dye image are produced. An image in a thermographic material is produced by imagewise heating the material. Ureidoaniline silver halide developing agents are also useful in processing compositions for photographic silver halide materials.

Claims58

Dependent claims

In a dye-forming imaging element comprising a support bearing, in reactive association,

(a) a dye-forming coupler, and
(b) an organic reducing agent that is capable in its oxidized form of reacting with the dye-forming coupler to form a dye,
the improvement wherein said reducing agent is a ureidoaniline silver halide developing agent free of strong electron withdrawing groups.

In a photothermographic element comprising a support having thereon, in reactive association:

(a) photographic silver halide,
(b) a dye-forming coupler, and
(c) an oxidation-reduction image forming combination comprising
(1) an organic silver salt oxidizing agent, and
(2) an organic reducing agent for said organic silver salt oxidizing agent,
the improvement wherein said reducing agent is a ureidoaniline reducing agent that is capable in its oxidized form of reacting with said dye-forming coupler to form a dye.

3 more elements

In a dye-forming imaging composition comprising

(a) a dye-forming coupler, and
(b) an organic reducing agent that is capable in its oxidized form of reacting with the dye-forming coupler to form a dye,
the improvement wherein said reducing agent is a ureidoaniline silver halide developing agent free of strong electron withdrawing groups.

In a photothermographic composition comprising:

(a) photographic silver halide,
(b) a dye-forming coupler, and
(c) an oxidation-reduction image forming combination comprising
(1) an organic silver salt oxidizing agent, and
(2) an organic reducing agent for said organic silver salt oxidizing agent,
the improvement wherein said reducing agent is a ureidoaniline reducing agent that is capable in its oxidized form of reacting with said dye-forming coupler to form a dye.

3 more elements

A thermographic element comprising a support having thereon, in reactive association, in binder:

(a) a dye-forming coupler, and
(b) an oxidation-reduction image forming combination comprising
(1) an organic silver salt oxidizing agent, and
(2) an organic reducing agent for said organic silver salt oxidizing agent,
the improvement wherein said reducing agent is a ureidoaniline reducing agent that is capable in its oxidized form of reacting with said dye-forming coupler to form a dye.

2 more elements

In a dye-forming processing solution for a photographic silver halide element, said solution comprising

(a) a dye-forming coupler,
(b) a silver halide developing agent that is capable in its oxidized form of reacting with the dye-forming coupler to form a dye,
(c) an alkaline activator, and
(d) at least one solvent,
the improvement wherein said silver halide developing agent is a ureidoaniline silver halide developing agent.

2 more elements

In a method of forming a dye image in an exposed photographic element comprising a support bearing, in reactive association;

(a) photographic silver halide, and
(b) a dye-forming coupler, comprising developing the exposed photographic element in a silver halide developer solution,
the improvement comprising, developing said exposed photographic element in a developer solution comprising an alkaline activator and a ureidoaniline silver halide developing agent which reacts in its oxidized form with the dye-forming coupler to form a dye.

Dependencies are inferred from the claim text.

Dye-forming developers in an imaging material and process

Life of this patent

Dye-forming developers in an imaging material and process

Life of this patent

Abstract

Claims58