Image-recording element
AssigneePolaroid Corporation
InventorsGary E. Cargill, Edward C. Taylor, Peter Viski, Christopher E. R. Orvig
Life of this patent
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Abstract
There are described heat-developable photosensitive image-recording elements which have an alkali-generating system incorporated therein. In the alkali-generating system, a slightly water-soluble metal compound is reacted with a salt of 2-hydroxy-pyridine-N-oxide, or its derivatives, in the presence of a fluid such as water, to form an insoluble precipitate and the alkali required for silver image development during processing. The image-recording materials are useful as image-forming materials in thermographic and photothermographic processes.
Claims33
A heat-developable image-recording element comprising:
- a first support and an optional second support and carried by said first support or confined between said first and said second supports;
- a layer including a source of silver ions;
- an image-receiving layer;
- and
- an alkali-generating system comprising a ligand, represented by the following formula ##STR13## wherein:
- X is a hydrogen atom or a substituent selected from the group consisting of a halogen atom, cyano, nitro, hydroxyl, substituted or unsubstituted alkyl having from 1 to 6 carbon atoms, cycloalkyl, aryl, alkenyl, alkynyl, alkoxy, aryl-oxy, acylamino, acyl, amino, heterocyclic radical, alkylsulfonyl, arylsulfonyl, and carbamoyl;
- M is a photographically acceptable cation;
- n is an integer from 0 to 4;
- and
- a slightly water-soluble metal compound represented by the formula D(W).sub.m wherein D represents a metal other than an alkali metal, W is a photographically acceptable counterion, and m is a positive integer selected so as to establish equilibrium between the valences of D and W.
A heat-developable image-recording element for use in a diffusion transfer color process comprising:
- a first support and an optional second support and carried by said first support or confined between said first and said second supports;
- a layer including a photosensitive silver halide;
- a reducing agent;
- an alkali-generating system comprising a ligand represented by the formula ##STR19## wherein:
- X is a hydrogen atom or a substituent selected from the group consisting of a halogen atom, cyano, nitro, hydroxyl, substituted or unsubstituted alkyl having from 1 to 6 carbon atoms, cycloalkyl, aryl, alkenyl, alkynyl, alkoxy, aryl-oxy, acylamino, acyl, amino, heterocyclic radical, alkylsulfonyl, arylsulfonyl, and carbamoyl;
- M is a photographically acceptable cation;
- n is an integer from 0 to 4;
- a slightly water-soluble metal compound represented by the formula D(W).sub.m wherein D represents a metal other than an alkali metal, W is a photographically acceptable counterion, and m is a positive integer selected so as to establish equilibrium between the valences of D and W;
- an image dye-providing material;
- and
- an image-receiving layer.
A heat-developable image-recording element for use in a diffusion transfer black and white process comprising:
- a first support and an optional second support and carried by said first support or confined between said first and said second supports;
- a layer including a photosensitive silver halide;
- a reducing agent;
- an alkali-generating system comprising a ligand represented by the formula ##STR25## wherein:
- X is a hydrogen atom or a substituent selected from the group consisting of a halogen atom, cyano, vitro, hydroxyl, substituted or unsubstituted alkyl having from 1 to 6 carbon atoms, cycloalkyl, aryl, alkenyl, alkynyl, alkoxy, aryl-oxy, acylamino, acyl, amino, heterocyclic radical, alkylsulfonyl, arylsulfonyl, and carbamoyl;
- M is a photographically acceptable cation;
- n is an integer from 0 to 4;
- a slightly water-soluble metal compound represented by the formula D(W).sub.m wherein D represents a metal other than an alkali metal, W is a photographically acceptable counterion, and m is a positive integer selected so as to establish equilibrium between the valences of D and W;
- and
- an image-receiving layer containing silver precipitating nuclei.
Dependencies are inferred from the claim text.