Patent US4741992A successfully refreshed from Google Patents.
US4741992A
Expired / Lapsed
US
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Thermally processable element comprising an overcoat layer containing poly(silicic acid)
Assignee: Eastman Kodak Co
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Filing: 1986-09-22
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Granted: 1988-05-03
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Expires: 2006-09-22
Abstract
Abstract A overcoat layer comprising poly(silicic acid) ##STR1## on a thermally processable element enables reduced release of volatile components from the element during thermal processing. The overcoat layer also can optionally comprise other water soluble polymers. A developed visible image is provided in an exposed silver halide photothermographic element comprising such an overcoat by uniformly heating the photothermographic element to moderately elevated temperatures without release of volatile components. The described overcoat is also useful on thermographic elements.
Inventors
- 👤 Wojciech M. Przezdziecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:16
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
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
71 words
In a photothermographic or thermographic imaging element comprising a support, bearing a photothermographic or thermographic imaging layer and an overcoat layer, the improvement wherein the overcoat layer comprises 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR7## wherein x is an integer within the range of at least 3 to about 600 and comprises a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 2
Dependent Claim
71 words
In a photothermographic or thermographic imaging element comprising a support, bearing a photothermographic or thermographic imaging layer and an overcoat layer, the improvement wherein the overcoat layer comprises 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR7## wherein x is an integer within the range of at least 3 to about 600 and comprises a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 3
Dependent Claim
21 words
An imaging element as in claim 1 wherein the overcoat layer comprises 1 to 50% by weight water soluble poly(vinyl alcohol).
Claim 4
Dependent Claim
61 words
A photothermographic element comprising a support bearing a photothermographic silver halide emulsion layer and an overcoat layer comprising 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR8## wherein x is an integer within the range of at least 3 to about 600 and comprising a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 5
Dependent Claim
61 words
A photothermographic element comprising a support bearing a photothermographic silver halide emulsion layer and an overcoat layer comprising 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR8## wherein x is an integer within the range of at least 3 to about 600 and comprising a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 6
Dependent Claim
21 words
A photothermographic element as in claim 3 wherein the overcoat layer comprises 1 to 50% by weight water soluble poly(vinyl alcohol).
Claim 7
Dependent Claim
29 words
A photothermographic element as in claim 3 wherein the overcoat layer comprises 50% to 90% by weight poly(silicic acid) and 1 to 50% by weight water soluble poly(vinyl alcohol).
Claim 8
Dependent Claim
26 words
A photothermographic element as in claim 3 wherein the overcoat comprises 1 to 50% by weight water soluble poly(vinyl alcohol) which is 80 to 99% hydrolyzed.
Claim 9
Dependent Claim
16 words
A photothermographic element as in claim 3 wherein the photothermographic layer comprises a poly(vinyl butyral) binder.
Claim 10
Dependent Claim
94 words
A photothermographic element comprising a support bearing in reactive association, in a binder, (a) photographic silver halide, (b) an image-forming combination comprising (i) an organic silver salt oxidizing agent, with (ii) a reducing agent for the organic silver salt oxidizing agent, (c) a toning agent; and having an overcoat layer comprising 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR9## wherein x is an integer within the range of at least 3 to about 600 and comprising a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 11
Dependent Claim
94 words
A photothermographic element comprising a support bearing in reactive association, in a binder, (a) photographic silver halide, (b) an image-forming combination comprising (i) an organic silver salt oxidizing agent, with (ii) a reducing agent for the organic silver salt oxidizing agent, (c) a toning agent; and having an overcoat layer comprising 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR9## wherein x is an integer within the range of at least 3 to about 600 and comprising a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 12
Dependent Claim
99 words
A photothermographic element as in claim 8 comprising a support bearing in reactive association, in a poly(vinyl butyral) binder, (a) photographic silver halide, (b) an image-forming combination comprising (i) silver behenate, with (ii) a phenolic reducing agent for the silver behenate, (c) a succinimide agent, and (d) an image stabilizer; and having an overcoat layer comprising 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR10## wherein x is an integer within the range of at least 3 to about 600 and comprising a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 13
Dependent Claim
65 words
In a thermographic element comprising a support bearing a thermographic layer and an overcoat layer, the improvement wherein the overcoat layer comprises 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR11## wherein x is an integer within the range of at least 3 to about 600 and comprises a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 14
Dependent Claim
65 words
In a thermographic element comprising a support bearing a thermographic layer and an overcoat layer, the improvement wherein the overcoat layer comprises 50% to 90% by weight poly(silicic acid) represented by the formula: ##STR11## wherein x is an integer within the range of at least 3 to about 600 and comprises a water soluble hydroxyl containing polymer or monomer that is compatible with poly(silicic acid).
Claim 15
Dependent Claim
20 words
A thermographic element as in claim 10 wherein the overcoat comprises 1 to 50% by weight water soluble poly(vinyl alcohol).
Claim 16
Dependent Claim
16 words
A thermographic element as in claim 10 comprising a thermographic layer comprising a poly(vinyl butyral) binder.
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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) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |