US3856527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective layer for photothermographic elements
Assignee: Eastman Kodak Co
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Filing: 1973-08-06
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Granted: 1974-12-24
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Expires: 1993-08-06
Abstract
Abstract On a photographic element comprising at least one heatprocessable, photographic layer, a protective layer comprising certain carboxylic polyesters provides improved resistance to abrasion and fingerprinting, resistance to reticulation and surface cracking without adversely affecting sensitometric properties of the photographic element upon processing. A latent image in such a photographic element can be developed by uniformly heating the photothermographic element containing the protective layer. Silica particles in the protective layer can enhance resistance of the protective layer to sticking to a heated metal surface and further enable the layer to glide smoothly over the heated metal surface.
Inventors
- 👤 F Hamb
- 👤 G Hiller
- 👤 A Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:57
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49872; G03C1/76; G03C1/7614; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10S430/162; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179; Y10T428/31797
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
A photothermographic element as in claim 1 wherein said carboxylic polyester is a copolymer of (i) 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl)indan, (ii) terephthalic acid and (iii) bisphenol A.
Claim 2
Dependent Claim
21 words
A photothermographic element as in claim 1 wherein said carboxylic polyester is a copolymer of (i) 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl)indan and (ii) bisphenol A.
Claim 3
Dependent Claim
28 words
A photothermographic element as in claim 1 wherein said protective layer comprises about 1 mg. to about 100 mg. of said carboxylic polyester per square decimeter of support.
Claim 4
Dependent Claim
11 words
A photothermographic element as in claim 1 also comprising silica particles.
Claim 5
Dependent Claim
33 words
A photothermographic element as in claim 1 also comprising 2 mg. to 25 mg. of silica particles having an average particle size of 0.001 to 0.10 micron per 929 square centimeters of support.
Claim 6
Dependent Claim
51 words
A photothermographic element having thereon a protective layer as in claim 1 wherein said photothermographic element comprises a support and I. an oxidation-reduction image-forming combination comprising (i) a silver salt oxidizing agent with (ii) an organic reducing agent, II. photosensitive silver halide, III. a polymeric binder, and IV. an activator-toning agent.
Claim 7
Dependent Claim
70 words
In a photothermographic element comprising a support and a. an oxidation-reduction image-forming combination comprising (i) silver behenate with (ii) a sulfonamidophenol reducing agent, b. photosensitive silver halide, c. a poly(vinyl butyral) binder, and d. an activator-toning agent comprising N-hydroxynaphthalimide, and a protective layer the improvement wherein said protective layer is a copolymer of (i) 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl)indan and (ii) bisphenol A, said copolymer having a glass transition temperature of at least 190*C.
Claim 8
Dependent Claim
35 words
A photothermographic element as in claim 8 wherein said protective layer contains 2 mg. to 25 mg. of silica particles having an average particle size of 0.001 to 0.10 micron per square foot of support.
Claim 9
Dependent Claim
70 words
In a photothermographic element comprising a. an oxidation-reduction image-forming combination comprising (i) silver behenate with (ii) a sulfonamidophenol reducing agent, b. photosensitive silver halide, c. a poly(vinyl butyral) binder, and d. an activator-toning agent comprising N-hydroxynaphthalimide, and a protective layer, the improvement wherein said protective layer is a copolymer of (i) 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl)indan, (ii) terephthalic acid, and (iii) bisphenol A, said copolymer having a glass transition temperature of at least 190*C.
Claim 10
Dependent Claim
35 words
A procEss of developing an image in a photothermographic element having thereon a protective overcoat layer comprising a carboxylic polyester as defined in claim 1 comprising heating said element from about 80*C. to about 250*C.
Claim 11
Dependent Claim
19 words
A process as in claim 9 wherein said heating is carried out for about 0.5 to about 60 seconds.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |