Mesoionic 1,2,4-triazolium-3-thiolates as silver halide stabilizers and fixing agents
AssigneeEastman Kodak Company
InventorsHenry W. Altland, Edward L. Dedio, Gary J. McSweeney
Life of this patent
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Abstract
Mesoionic 1,2,4-triazolium-3-thiolates are silver halide stabilizers and fixing agents. They are useful in heat developable and heat stabilizable photographic silver halide materials and processes. After imagewise exposure of the photographic materials, developed and stabilized silver images are produced by heating the materials. The mesoionic 1,2,4-triazolium-3-thiolates are also silver halide stabilizers and fixing agents in photographic silver halide processing compositions.
Claims17
In a heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in binder:
- (a) photographic silver halide,
- (b) a photographic silver halide developing agent,
- (c) an activating concentration of a thermal base releasing compound,
- the improvement comprising
- (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer.
A heat developable and heat stabilizable photographic silver halide element comprising a support having thereon, in reactive association, in a gelatino binder:
- (a) photographic silver bromide;
- (b) a photographic silver bromide developing agent;
- (c) an activating concentration of a thermal base releasing compound consisting essentially of an ethylene bis(sulfonyl acetic acid) compound;
- and
- (d) a stabilizing concentration of a 1,2,4-triazolium-3-thiolate stabilizer precursor consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate.
In a heat developable and heat stabilizable photographic silver halide composition comprising
- (a) photographic silver halide,
- (b) a photographic silver halide developing agent,
- (c) an activating concentration of a thermal base releasing compound,
- the improvement comprising
- (d) a stabilizing concentration of a mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer.
A heat developable and heat stabilizable photographic silver halide composition comprising, in a gelatino binder:
- (a) photographic silver bromide;
- (b) a photographic silver bromide developing agent;
- (c) an activating concentration of a thermal base releasing compound consisting essentially of an ethylene bis(sulfonyl acetic acid) compound;
- and
- (d) a stabilizing concentration of a silver halide stabilizer consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate.
A process of developing and stabilizing an image in an exposed photographic silver halide element comprising a support having thereon, in a gelatino binder:
- (a) photographic silver halide;
- (b) a photographic silver halide developing agent;
- (c) an activating concentration of a thermal base releasing compound, and
- (d) a stabilizing concentration of a silver halide stabilizer consisting essentially of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate,
- said process comprising heating said element to a temperature within the range of about 120.degree. C. to about 180.degree. C. until said image is developed and stabilized.
A photographic silver halide fixing composition comprising a silver halide fixing concentration of a mesoionic 1,2,4-triazolium-3-thiolate and an organic acid.
A photographic silver halide fixing solution comprising, in an aqueous solvent, a fixing concentration of a mesoionic 1,2,4-triazolium-3-thiolate and acetic acid.
A photographic silver halide fixing composition comprising a silver halide fixing concentration of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate and acetic acid.
A photographic silver halide fixing solution comprising, in an aqueous solvent, a silver halide fixing concentration of 1,4,5-trimethyl-1,2,4-triazolium-3-thiolate and acetic acid.
Dependencies are inferred from the claim text.