US3874946A
Expired / Lapsed
US
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Photothermographic element, composition and process
Assignee: Eastman Kodak Co
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Filing: 1974-02-19
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Granted: 1975-04-01
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Expires: 1994-02-19
Abstract
Abstract A stabilizer precursor comprising a compound which is a photolytically active polybrominated organic compound comprising (a) a 2,4-bis(tribromomethyl)-s-triazine, (b) a polybromoalkylsulfonyl compound having an aromatic chromophore group, or (c) a combination of the described stabilizer precursors, in a photothermographic element or composition comprising photographic silver halide provides improved postprocessing stability of the element or composition. The described stabilizer precursors are useful in photothermographic materials, for example, comprising photographic silver halide and an oxidation-reduction image-forming combination comprising a heavy metal salt oxidizing agent with a reducing agent. A developed visible image is provided after imagewise exposure by overall heating the photothermographic material to moderately elevated temperatures.
Inventors
- 👤 Lorenzo F Costa
- 👤 Allan James A Van
- 👤 Frank Grum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:57
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
67 words
In a photothermographic element comprising a support having thereon a layer comprising (a) photographic silver halide in association with, (b) an oxidation-reduction image-forming combination comprising (i) a heavy metal salt oxidizing agent with (ii) an organic reducing agent, (c) a polymeric binder for the layer and (d) a bromine compound stabilizer precursor, the improvement wherein said bromine compound stabilizer precursor comprises a compound represented by the structure:
Claim 2
Dependent Claim
67 words
In a photothermographic element comprising a support having thereon a layer comprising (a) photographic silver halide in association with, (b) an oxidation-reduction image-forming combination comprising (i) a heavy metal salt oxidizing agent with (ii) an organic reducing agent, (c) a polymeric binder for the layer and (d) a bromine compound stabilizer precursor, the improvement wherein said bromine compound stabilizer precursor comprises a compound represented by the structure:
Claim 3
Dependent Claim
14 words
A photothermographic element as in claim 1 wherein R3 is phenyl, naphthyl or benzothiazolyl.
Claim 4
Dependent Claim
15 words
A photothermographic element as in claim 1 wherein said bromine compound stabilizer precursor is 2-tribromomethylsulfonylbenzothiazole.
Claim 5
Dependent Claim
15 words
A photothermographic element as in claim 1 wherein said bromine compound stabilizer presursor is 2,4-bis(tribromomethyl)-6-methyltriazine.
Claim 6
Dependent Claim
15 words
A photothermographic element as in claim 1 wherein said bromine compound stabilizer precursor is 2,2-dibromo-2-phenylsulfonylacetamide.
Claim 7
Dependent Claim
30 words
A photothermographic element as in claim 1 comprising about 0.002 mole to about 0.75 mole of said bromine compound stabilizer precursor per mole of total silver in said photothermographic Element.
Claim 8
Dependent Claim
73 words
A photothermographic element comprising a support having thereon a layer comprising a. photographic silver halide in association with b. an oxidation-reduction image-forming combination comprising i. silver behenate, with ii. a phenolic reducing agent, c. a poly(vinyl butyral) binder for the layer, d. a toner comprising phthalazinone, succinimide or N-hydroxy-1, 8-naphthalimide, e. a spectral sensitizing dye, and f. about 0.015 to about 0.50 mole of 2-tribromomethylsulfonylbenzothiazole per mole of total silver in said element.
Claim 9
Dependent Claim
73 words
A photothermographic element comprising a support having thereon a layer comprising a. photographic silver halide in association with b. an oxidation-reduction image-forming combination comprising i. silver behenate, with ii. a phenolic reducing agent, c. a poly(vinyl butyral) binder for the layer, d. a toner comprising phthalazinone, succinimide or N-hydroxy-1, 8-naphthalimide, e. a spectral sensitizing dye, and f. about 0.015 to about 0.50 mole of 2-tribromomethylsulfonylbenzothiazole per mole of total silver in said element.
Claim 10
Dependent Claim
18 words
A photothermographic composition comprising photographic silver halide, a polymeric binder and a bromine compound represented by the formula:
Claim 11
Dependent Claim
18 words
A photothermographic composition comprising photographic silver halide, a polymeric binder and a bromine compound represented by the formula:
Claim 12
Dependent Claim
13 words
A photothermographic composition as in claim 8 wherein said bromine compound is 2-tribromomethylsulfonylbenzothiazole.
Claim 13
Dependent Claim
27 words
A photothermographic composition as in claim 8 comprising about 0.002 mole to about 0.75 mole of said bromine compound per mole of total silver in said composition.
Claim 14
Dependent Claim
56 words
In a photothermographic composition comprising (a) photographic silver halide in association with (b) an oxidation-reduction image-forming combination comprising (i) a heavy metal salt oxidizing agent with (ii) a reducing agent, (c) a polymeric binder and (d) a bromine compound stabilizer precursor, the improvement wherein said bromine compound stabilizer precursor comprises a compound represented by the structure:
Claim 15
Dependent Claim
56 words
In a photothermographic composition comprising (a) photographic silver halide in association with (b) an oxidation-reduction image-forming combination comprising (i) a heavy metal salt oxidizing agent with (ii) a reducing agent, (c) a polymeric binder and (d) a bromine compound stabilizer precursor, the improvement wherein said bromine compound stabilizer precursor comprises a compound represented by the structure:
Claim 16
Dependent Claim
14 words
A photothermographic composition as in claim 11 wherein R3 is phenyl, naphthyl or benzothiazolyl.
Claim 17
Dependent Claim
15 words
A photothermographic composition as in claim 11 wherein said bromine compound stabilizer precursor is 2-tribromomethylsulfonylbenzothiazole.
Claim 18
Dependent Claim
14 words
A photothermographic composition as in claim 11 wherein said bromine compound stabilizer is 2,4-bis(tribromomethyl)-6-methyltriazine.
Claim 19
Dependent Claim
15 words
A photothermographic composition as in claim 11 wherein said bromine compound stabilizer precursor is 2,2-dibromo-2-phenylsulfonylacetamide.
Claim 20
Dependent Claim
29 words
A phototheimographic composition as in claim 11 comprising about 0.002 mole to about 0.75 mole of said bromine compound stabilizer precursor per mole of total silver in said composition.
Claim 21
Dependent Claim
66 words
A photothermographic composition comprising a. photographic silver halide in association with b. an oxidation-reduction image-forming combination comprising i. silver behenate, with ii. a phenolic reducing agent, c. a poly(vinyl butyral) binder for the composition, d. a toner comprising phthalazinone, succinimide or N-hydroxy-1, 8-naphthalimide, e. a spectral sensitizing dye, and f. about 0.015 to about 0.50 mole of 2-tribromomethylsulfonylbenzothiazole per mole of total silver in said composition.
Claim 22
Dependent Claim
66 words
A photothermographic composition comprising a. photographic silver halide in association with b. an oxidation-reduction image-forming combination comprising i. silver behenate, with ii. a phenolic reducing agent, c. a poly(vinyl butyral) binder for the composition, d. a toner comprising phthalazinone, succinimide or N-hydroxy-1, 8-naphthalimide, e. a spectral sensitizing dye, and f. about 0.015 to about 0.50 mole of 2-tribromomethylsulfonylbenzothiazole per mole of total silver in said composition.
Claim 23
Independent Claim
60 words
A METHOD OF DEVELOPING AN IMAGE IN A PHOTOHERMOGRAPHIC ELEMENT COMPRISING A SUPPORT HAVING THEREON A LAYER COMPRISING (A) PHOTOGRAPHIC SILVER HALIDE IN ASSOCIATION WITH (B) AN OXIDATION-REDUCTION IMAGE-FORMING COMBINATION COMPRISING (I) A SILVER SALT OXIDIZING AGENT WITH (II) A REDUCING AGENT, (C) A POLYMERIC BINDER AND (D) A BROMINE COMPOUND STABILIZER PRECURSOR COMPRISING A COMPOUND REPRESENTED BY THE STRUCTURE:
Claim 24
Independent Claim
60 words
A METHOD OF DEVELOPING AN IMAGE IN A PHOTOHERMOGRAPHIC ELEMENT COMPRISING A SUPPORT HAVING THEREON A LAYER COMPRISING (A) PHOTOGRAPHIC SILVER HALIDE IN ASSOCIATION WITH (B) AN OXIDATION-REDUCTION IMAGE-FORMING COMBINATION COMPRISING (I) A SILVER SALT OXIDIZING AGENT WITH (II) A REDUCING AGENT, (C) A POLYMERIC BINDER AND (D) A BROMINE COMPOUND STABILIZER PRECURSOR COMPRISING A COMPOUND REPRESENTED BY THE STRUCTURE:
Claim 25
Dependent Claim
99 words
A method as in claim 18 of developing an image in a photothermographic element comprising a support having thereon a layer comprising a. photographic silver halide in association with b. an oxidation-reduction image-forming combination comprising i. silver behenate, with ii. a phenolic reducing agent, c. a poly(vinyl butyral) binder, d. a toner comprising phthalazinone, succinimide, or N-hydroxy-1,8-naphthalimide, e. a spectral sensitizing dye, and f. about 0.015 to about 0.50 mole of 2-tribromomethylsulfonylbenzothiazole per mole of total silver in said photothermographic element, comprising overall heating said element to about 80*C. to about 170*C. for about 0.5 to about 30 seconds.
References Cited (Backward Citations)
US3672904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |