Photothermographic material and process
AssigneeEastman Kodak Company
InventorsGeorge L. Fletcher, Jr., Richard A. deMauriac, Stewart H. Merrill
Life of this patent
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Abstract
In a photothermographic element comprising (A) at least one photosensitive layer comprising a photosensitive component, such as photosensitive silver halide or a diazotype photosensitive material, (B) at least one layer comprising a processing agent for the photosensitive component and (C) a separation polymer between (A) and (B), increased preexposure storage stability is provided by a polysulfonamide as separation polymer (C). After imagewise exposure of the photothermographic element, an image can be developed by merely heating the element to moderately elevated temperatures.
Claims18
In a photothermographic element comprising (A) at least one photosensitive layer comprising a diazo or silver halide photosensitive component, (B) at least one layer comprising a processing agent for said photosensitive component and (C) a separation polymer between said photosensitive component and said processing agent,
- the improvement wherein
- said separation polymer (C) comprises a polysulfonamide which has the property of producing increased preexposure storage stability for said element.
In a photothermographic element having increased preexposure storage stability, said element comprising (A) a layer comprising, (a) in a binder, (b) a dye-forming coupler and (c) a reducing agent which in its oxidized form reacts with said coupler to produce a dye, and (B) a layer comprising, (d) in a binder,
- (e) photosensitive silver halide and (f) an organic silver salt oxidizing agent which, with said reducing agent, is an oxidation-reduction image-forming combination, and (C) an overcoat layer,
- the improvement wherein
- said binder in (A) comprises a polysulfonamide which has the property of producing increased preexposure storage stability for said element.
In a photothermographic element comprising a support having thereon (A) a first layer comprising (a) photosensitive silver halide in reactive association with (b) an organic silver salt oxidizing agent, in (c) a gelatino binder, and (B) contiguous to (A), a second layer comprising (d) a diffusible, organic reducing agent for said organic silver salt, (e) a diffusible, dye-forming coupler that forms a dye with the oxidized form of the reducing agent in (f) a polymeric binder,
- the improvement wherein
- said polymeric binder in (B) comprises a polysulfonamide that has the properties of being permeable to said reducing agent and producing increased preexposure storage stability for said element.
A photothermographic element comprising a
- support having thereon, in sequence,
- (A) a first layer comprising
- (a) a polysulfonamide binder, and
- (b) a silver halide stabilizing concentration of a heterocyclic thione silver halide stabilizing agent, and, contiguous to (A),
- (B) a second layer consisting essentially of
- (c) a polymeric antistrike composition, and,
- contiguous to (B),
- (C) a third layer comprising
- (d) photosensitive silver halide, in reactive association, with
- (e) an oxidation-reduction image-forming combination comprising
- (i) a silver salt of a long-chain fatty acid, with
- (ii) a reducing agent, in
- (f) a poly(vinyl butyral) binder.
A photothermographic element comprising a support having thereon, in sequence,
- (A) a first layer comprising
- (a) a polysulfonamide binder consisting essentially of poly(ethylene-co-1,4-cyclohexylenedimethylene-1-methyl-2,4-benzenedisulfon amide),
- (b) a stabilizing concentration of 1-methyl-4-imidazoline-2-thione, and,
- contiguous to (A),
- (B) a second layer consisting essentially of
- (c) a polyisobutylene antistrike composition, and,
- contiguous to (B),
- (C) a third layer comprising
- (d) photosensitive silver halide, in reactive association, with
- (e) an image-forming combination comprising
- (i) an organic silver salt oxidizing agent consisting essentially of a 3-amino-1,2,4-triazole silver salt, with
- (ii) an organic reducing agent consisting essentially of 2,5-dihydroxyphenylacetic acid, in
- (f) a gelatino binder.
A photothermographic element comprising a support having thereon, in sequence,
- (A) a first layer comprising
- (a) a polysulfonamide binder, and
- (b) a stabilizing concentration of a heterocyclic thione silver halide stabilizing agent, and,
- contiguous to (A),
- (B) a second layer consisting essentially of
- (c) a polymeric binder, antistrike composition, and,
- contiguous to (B),
- (C) a third layer comprising
- (d) photosensitive silver halide, in reactive association, with
- (e) an image-forming combination comprising
- (i) an organic silver salt oxidizing agent consisting essentially of an organic nitrogen acid silver salt, with
- (ii) a reducing agent, in
- (f) a gelatino binder.
A photothermographic element comprising a support having thereon, in sequence,
- (A) a first layer comprising
- (a) photosensitive silver halide, in reactive association, with
- (b) an organic silver salt oxidizing agent consisting essentially of a 3-amino-5-benzylthio-1,2,4-triazole silver salt, in
- (c) a gelatino binder, and,
- contiguous to (A),
- (B) a second layer comprising
- (d) a diffusible organic reducing agent consisting essentially of 2-methoxy-4-amino-5-methyl-N,N-dimethylaniline sulfuric acid salt monohydrate, with
- (e) a diffusible dye-forming coupler consisting essentially of 2-trifluoroacetamidoresorcinol, in
- (f) a polymeric binder consisting essentially of poly(ethylene-co-1,4-cyclohexyldimethylene-toluene-2,4-disulfonamide).
In a heat developable diazotype photosensitive element comprising (A) at least one diazotype photosensitive layer, (B) at least one layer comprising a processing agent for said diazotype photosensitive layer and (C) a separation layer between (A) and (B),
- the improvement wherein
- said separation layer (C) comprises a polysulfonamide which has the property of producing increased preexposure storage stability for said element.
In a heat processable diazotype photographic element comprising, in sequence,
- (a) a support, having thereon
- (b) a first layer comprising a base-release agent which has the property of releasing base upon heating,
- (c) a second layer comprising a polymer that is permeable to the base from said base-release agent,
- (d) a third layer comprising a polysulfonamide polymer that has the property of controlling diffusion of the base from said base-release agent,
- (e) a fourth layer comprising a polymer that is permeable to the base from said base-release agent, and
- (f) a fifth layer comprising a diazotype imageforming composition that has the property of being activated by the base from said base-releasing agent.
A method of providing increased preexposure stability to a photothermographic element of the type having at least one photosensitive layer comprising a diazo or silver halide photosensitive component, (B) at least one layer comprising a processing agent for said photosensitive component and (C) a separation polymer between said photosensitive component and said processing agent, comprising incorporating a polysulfonamide separation polymer into said photothermographic element between said photosensitive component and said processing agent.
A method of providing increased preexposure stability in a photothermographic element of the type having at least one diazo or silver halide photosensitive layer and at least one layer comprising a processing agent for the photosensitive layer, comprising incorporating a polysulfonamide containing layer between the photosensitive layer and the processing agent layer.
Dependencies are inferred from the claim text.