US3893860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photothermographic element and process
Assignee: Eastman Kodak Co
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Filing: 1974-07-16
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Granted: 1975-07-08
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Expires: 1994-07-16
Abstract
Abstract Certain acrylamide polymers in a layer contiguous to a photothermographic layer comprising (a) photographic silver halide in association with (b) a silver salt of certain heterocyclic thione compounds, (c) an organic reducing agent, and (d) a polymeric, synthetic binder for the photothermographic layer of a photothermographic element provide, for example, increased stability prior to imagewise exposure without significantly adversely affecting sensitometric properties of the photothermographic element. The acrylamide polymers can comprise an overcoat layer or a layer between the photothermographic layer and a support for the photothermographic element or can be in both such layers.
Inventors
- 👤 Richard C Sutton
- 👤 Heinz E Stapelfeldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:00
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49872; Y; Y10; Y10S; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
33 words
IN A PHOTOTHERMOGRAPHIC ELEMENT COMPRISING A SUPPORT HAVING THEREON (1): A. PHOTOGRAPHIC SILVER HALIDE IN ASSOCIATION WITH B. A SILVER SALT OF A HETEROCYCLIC THIONE, SAID HETEROCYCLIC THIONE BEING REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
33 words
IN A PHOTOTHERMOGRAPHIC ELEMENT COMPRISING A SUPPORT HAVING THEREON (1): A. PHOTOGRAPHIC SILVER HALIDE IN ASSOCIATION WITH B. A SILVER SALT OF A HETEROCYCLIC THIONE, SAID HETEROCYCLIC THIONE BEING REPRESENTED BY THE FORMULA:
Claim 3
Dependent Claim
22 words
A photothermographic element as in claim 1 also comprising in said layer (II) at least one polymer other than said copolymer (A).
Claim 4
Dependent Claim
20 words
A photothermographic element as in claim 1 wherein said copolymer (A) comprises at least 50% by weight of poly-(acrylamide-co-3-methyl-1-vinylimidazolium methosulfate).
Claim 5
Dependent Claim
19 words
A photothermographic element as in claim 1 wherein said copolymer (A) comprises at least 50% by weight of poly-(acrylamide).
Claim 6
Dependent Claim
19 words
A photothermographic element as in claim 1 wherein said copolymer (A) comprises at least 50% by weight of poly-(acrylamide-co-1-vinylimidazole).
Claim 7
Dependent Claim
19 words
A photothermographic element as in claim 1 wherein said copolymer (A) comprises at least 50% by weight of poly-(acrylamide-co-2-methyl-1-vinylimidazole).
Claim 8
Dependent Claim
19 words
A photothermoGraphic element as in claim 1 wherein said copolymer (A) comprises at least 50% by weight of poly-(acrylamide-co-1-vinyl-2-pyrrolidone).
Claim 9
Dependent Claim
106 words
A photothermographic element as in claim 1 comprising a support having thereon, in sequence: I. a layer of poly(acrylamide-co-1-vinylimidazole), wherein the weight ratio of starting monomers for said copolymer is, respectively, about 60:40 to about 98:2. II. a photothermographic layer comprising: a. photographic silver iodide in association with b. a silver salt of a heterocyclic thione selected from the group consisting of silver salts of 3-carboxymethyl-4-methyl-4-thiazoline-2-thione, 3-(2-carboxyethyl)-4-hydroxymethyl-4-thiazoline-2-thione, 3-(2-carboxyethyl)benzothiazoline-2-thione, 3-(2-carboxyethyl)-4-methyl-4-thiazoline-2-thione, and combinations thereof, c. t-butylhydroquinone, and d. a poly(acrylamide-co-2-acetoacetoxyethyl methacrylate or poly(acrylamide-co-1-vinylimidazole) binder, and III. an overcoat layer of poly(acrylamide-co-1-vinylimidazole) wherein the weight ratio of starting monomers for said copolymer is, respectively, about 60:40 to about 98:2.
Claim 10
Dependent Claim
18 words
A photothermographic element as in claim 1 wherein said layer (II) also comprises a silver halide developing agent.
Claim 11
Dependent Claim
27 words
A photothermographic element as in claim 1 wherein said layer (II) comprises about 0.40 to about 2.15 g. of said copolymer (A) per m.2 of said support.
Claim 12
Dependent Claim
34 words
A photothermographic element as in claim 1 wherein said polymeric synthetic binder comprises a polymer selected from the group consisting of poly(acrylamide), poly(acrylamide-co-2-acetoacetoxyethyl methacrylate), poly(acrylamide-co- Alpha -chloroacrylic acid), poly(acrylamide-co-1-vinylimidazole), poly-(vinyl alcohol), and combinations thereof.
Claim 13
Dependent Claim
15 words
A photothermographic element as in claim 1 also comprising a hardener in said layer (II).
Claim 14
Dependent Claim
16 words
A photothermographic element as in claim 1 also comprising a aldehyde hardener in said layer (II).
Claim 15
Dependent Claim
12 words
A photothermographic element as in claim 1 also comprising a 3-mercapto-1,2,4-triazole toner.
Claim 16
Dependent Claim
12 words
A photothermographic element as in claim 1 also comprising a 2,4-dimercaptopyrimidine toner.
Claim 17
Dependent Claim
30 words
A process of developing a latent image in a photothermographic element as defined in claim 1 comprising heating said element to a temperature of about 80* to about 200* C.
Claim 18
Dependent Claim
19 words
A process as in claim 16 wherein said photothermographic element is heated for about 0.5 to about 60 sec.
References Cited (Backward Citations)
US2732304A
Cited
US3468664A
Cited
US3094417A
Cited
US3672904A
Cited
US3785830A
Cited
US3856526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |