US4264725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photothermographic composition and process
Assignee: Eastman Kodak Co
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Filing: 1979-10-01
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Granted: 1981-04-28
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Expires: 1999-10-01
Abstract
Abstract In a photothermographic silver halide composition capable of being coated on a support comprising a hydrophilic photosensitive silver halide emulsion containing a gelatino peptizer with an organic solvent mixture, a hydrophobic binder and an oxidation-reduction image-forming composition comprising (i) a silver salt of a long-chain fatty acid with (ii) an organic reducing agent, improvements are provided by a solvent mixture comprising a combination of (A) an alcohol photographic speed-increasing solvent which is a compound selected from the group consisting of benzyl alcohol photographic speed-increasing solvents and 2-phenoxyethanol speed-increasing solvents with (B) an aromatic hydrocarbon solvent that is compatible with the alcohol solvent and (C) 0 to 10% by weight of the solvent mixture of such hydrophobic binder. The described photothermographic composition can be prepared by very thoroughly mixing, such as ultrasonic wave mixing, (I) a hydrophilic photosensitive silver halide emulsion with (II) an organic solvent mixture comprising described (A), (B) and (C), and then very thoroughly mixing the resulting product with (III) comprising (a) a hydrophobic binder and (b) an oxidation-reduction image-forming composition comprising (i) a silver salt of a long-chain fatty acid with (ii) an organic reducing agent, typically in an organic solvent. The photothermographic composition can be coated on a suitable support to provide a photothermographic element.
Inventors
- 👤 John W. Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49863; G03C1/005; G03C1/025; G03C1/04; G03C2200/00; G03C2200/27; G03C8/00; G03C8/40; G03C8/4013; G03C8/402
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
105 words
In a photothermographic silver halide composition capable of being coated on a support comprising a hydrophilic photosensitive silver halide emulsion containing a gelatino peptizer with an organic solvent mixture, a hydrophobic binder and an oxidation-reduction image-forming composition comprising (i) a silver salt of a long-chain fatty acid with (ii) an organic reducing agent, the improvement wherein said composition comprises, as said solvent mixture, a combination of (A) an alcohol photographic speed-increasing solvent which is a compound selected from the group consisting of benzyl alcohol photographic speed-increasing solvents and 2-phenoxyethanol photographic speed-increasing solvents with (B) an aromatic hydrocarbon solvent that is compatible with said alcohol solvent.
Claim 2
Dependent Claim
105 words
In a photothermographic silver halide composition capable of being coated on a support comprising a hydrophilic photosensitive silver halide emulsion containing a gelatino peptizer with an organic solvent mixture, a hydrophobic binder and an oxidation-reduction image-forming composition comprising (i) a silver salt of a long-chain fatty acid with (ii) an organic reducing agent, the improvement wherein said composition comprises, as said solvent mixture, a combination of (A) an alcohol photographic speed-increasing solvent which is a compound selected from the group consisting of benzyl alcohol photographic speed-increasing solvents and 2-phenoxyethanol photographic speed-increasing solvents with (B) an aromatic hydrocarbon solvent that is compatible with said alcohol solvent.
Claim 3
Dependent Claim
39 words
A photothermographic silver halide composition as in claim 1 wherein the concentration of the gelatino peptizer is within the range of about 5 g to about 20 g of gelatin per mole of silver in said silver halide emulsion.
Claim 4
Dependent Claim
17 words
A photothermographic silver halide composition as in claim 1 wherein said alcohol solvent consists essentially of 2-phenoxyethanol.
Claim 5
Dependent Claim
18 words
A photothermographic silver halide composition as in claim 1 wherein said alcohol solvent consists essentially of benzyl alcohol.
Claim 6
Dependent Claim
18 words
A photothermographic silver halide composition as in claim 1 wherein said alcohol solvent consists essentially of DL-α-methylbenzyl alcohol.
Claim 7
Dependent Claim
18 words
A photothermographic silver halide composition as in claim 1 wherein said alcohol solvent consists essentially of m-(trifluoromethyl)benzyl alcohol.
Claim 8
Dependent Claim
17 words
A photothermographic silver halide composition as in claim 1 wherein said hydrocarbon solvent consists essentially of toluene.
Claim 9
Dependent Claim
64 words
A photothermographic silver halide composition as in claim 1 comprising a concentration of said alcohol solvent that is within the range of about 0.25 mole to about 2.0 moles of said alcohol solvent per mole of photosensitive silver halide in said emulsion; and, the ratio by volume of said alcohol solvent to said hydrocarbon solvent is within the range of about 1:50 to 1:200.
Claim 10
Dependent Claim
22 words
A photothermographic silver halide composition as in claim 1 wherein said solvent mixture also comprises up to 10% by weight poly(vinyl butyral).
Claim 11
Dependent Claim
92 words
In a photothermographic silver halide composition capable of being coated on a support comprising an aqueous photosensitive silver halide emulsion containing a gelatino peptizer with an organic solvent mixture, a hydrophobic polymeric binder consisting essentially of poly(vinyl butyral) and an oxidation-reduction image-forming combination comprising (i) a silver salt of a long-chain fatty acid consisting essentially of silver behenate with an organic reducing agent consisting essentially of a sulfonamidophenol, the improvement wherein said composition comprises, as said solvent mixture, a combination of 2-phenoxyethanol with toluene and up to 10% by weight poly(vinyl butyral).
Claim 12
Dependent Claim
92 words
In a photothermographic silver halide composition capable of being coated on a support comprising an aqueous photosensitive silver halide emulsion containing a gelatino peptizer with an organic solvent mixture, a hydrophobic polymeric binder consisting essentially of poly(vinyl butyral) and an oxidation-reduction image-forming combination comprising (i) a silver salt of a long-chain fatty acid consisting essentially of silver behenate with an organic reducing agent consisting essentially of a sulfonamidophenol, the improvement wherein said composition comprises, as said solvent mixture, a combination of 2-phenoxyethanol with toluene and up to 10% by weight poly(vinyl butyral).
Claim 13
Dependent Claim
99 words
In a photothermographic silver halide composition capable of being coated on a support comprising (I) an aqueous photosensitive silver halide emulsion containing a gelatino peptizer with (II) comprising an organic solvent mixture, (a) a hydrophobic polymeric binder consisting essentially of poly(vinyl butyral) and (b) an oxidation-reduction image-forming combination comprising (i) a silver salt of a long-chain fatty acid consisting essentially of silver behenate with (ii) an organic reducing agent consisting essentially of a sulfonamidophenol, the improvement wherein said composition comprises, as said solvent mixture, a combination of benzyl alcohol with toluene and up to 10% by weight poly(vinyl butyral).
Claim 14
Dependent Claim
99 words
In a photothermographic silver halide composition capable of being coated on a support comprising (I) an aqueous photosensitive silver halide emulsion containing a gelatino peptizer with (II) comprising an organic solvent mixture, (a) a hydrophobic polymeric binder consisting essentially of poly(vinyl butyral) and (b) an oxidation-reduction image-forming combination comprising (i) a silver salt of a long-chain fatty acid consisting essentially of silver behenate with (ii) an organic reducing agent consisting essentially of a sulfonamidophenol, the improvement wherein said composition comprises, as said solvent mixture, a combination of benzyl alcohol with toluene and up to 10% by weight poly(vinyl butyral).
Claim 15
Dependent Claim
121 words
In a method of preparing a photothermographic element comprising very thoroughly mixing (I) a hydrophilic photosensitive silver halide emulsion comprising a gelatino peptizer with (II) an organic solvent mixture and then very thoroughly mixing the resulting product with (III) comprising (a) a hydrophobic binder and (b) an oxidation-reduction image-forming composition comprising (i) a silver salt of a long-chain fatty acid with (ii) an organic reducing agent, and coating the resulting composition onto a support, the improvement wherein said method comprises said mixing of (I) with (II) wherein (II) comprises (A) an alcohol photographic speed-increasing solvent with (B) an aromatic hydrocarbon solvent that is compatible with said alcohol solvent and (C) 0 to 10% by weight of (II) of a hydrophobic binder.
Claim 16
Dependent Claim
121 words
In a method of preparing a photothermographic element comprising very thoroughly mixing (I) a hydrophilic photosensitive silver halide emulsion comprising a gelatino peptizer with (II) an organic solvent mixture and then very thoroughly mixing the resulting product with (III) comprising (a) a hydrophobic binder and (b) an oxidation-reduction image-forming composition comprising (i) a silver salt of a long-chain fatty acid with (ii) an organic reducing agent, and coating the resulting composition onto a support, the improvement wherein said method comprises said mixing of (I) with (II) wherein (II) comprises (A) an alcohol photographic speed-increasing solvent with (B) an aromatic hydrocarbon solvent that is compatible with said alcohol solvent and (C) 0 to 10% by weight of (II) of a hydrophobic binder.
Claim 17
Dependent Claim
15 words
A method as in claim 12 wherein said alcohol solvent consists essentially of benzyl alcohol.
Claim 18
Dependent Claim
15 words
A method as in claim 12 wherein said alcohol solvent consists essentially of DL-α-methylbenzyl alcohol.
Claim 19
Dependent Claim
16 words
In a method as in claim 12 wherein said alcohol solvent consists essentially of m-(trifluoromethyl)benzyl alcohol.
Claim 20
Dependent Claim
14 words
A method as in claim 12 wherein said alcohol solvent consists essentially of 2-phenoxyethanol.
Claim 21
Dependent Claim
15 words
In a method as in claim 12 wherein said hydrocarbon solvent consists essentially of toluene.
Claim 22
Dependent Claim
61 words
A method as in claim 12 wherein the concentration of said alcohol solvent is within the range of about 0.25 mole to about 2.0 moles of said alcohol solvent per mole of photosensitive silver halide; and, the ratio by volume of said alcohol solvent to said hydrocarbon solvent prior to said coating is within the range of about 1:50 to 1:200.
Claim 23
Dependent Claim
98 words
In a method of preparing a photothermographic element comprising ultrasonic wave mixing (I) a hydrophilic photosensitive silver halide emulsion comprising a gelatino peptizer with (II) an organic solvent mixture and then ultrasonic wave mixing the resulting product with (III) comprising (a) poly(vinyl butyral) binder and (b) an oxidation-reduction image-forming composition comprising (i) silver behenate with (ii) a sulfonamidophenol reducing agent, and coating the resulting composition onto a support, the improvement wherein said method comprises said mixing of (I) with (II) wherein (II) comprises (A) benzyl alcohol with (B) toluene and (C) 0 to 10% by weight poly(vinyl butyral).
Claim 24
Dependent Claim
98 words
In a method of preparing a photothermographic element comprising ultrasonic wave mixing (I) a hydrophilic photosensitive silver halide emulsion comprising a gelatino peptizer with (II) an organic solvent mixture and then ultrasonic wave mixing the resulting product with (III) comprising (a) poly(vinyl butyral) binder and (b) an oxidation-reduction image-forming composition comprising (i) silver behenate with (ii) a sulfonamidophenol reducing agent, and coating the resulting composition onto a support, the improvement wherein said method comprises said mixing of (I) with (II) wherein (II) comprises (A) benzyl alcohol with (B) toluene and (C) 0 to 10% by weight poly(vinyl butyral).
Claim 25
Dependent Claim
97 words
In a method of preparing a photothermographic element comprising ultrasonic wave mixing (I) a hydrophilic photosensitive silver halide emulsion comprising a gelatino peptizer with (II) an organic solvent mixture and then ultrasonic wave mixing the resulting product with (III) comprising (a) poly(vinyl butyral) binder and (b) an oxidation-reduction image-forming composition comprising (i) silver behenate with (ii) a sulfonamidophenol reducing agent and coating the resulting composition onto a support, the improvement wherein said method comprises said mixing of (I) with (II) wherein (II) comprises (A) 2-phenoxyethanol with (B) toluene and (C) 0 to 10% by weight poly(vinyl butyral).
Claim 26
Dependent Claim
97 words
In a method of preparing a photothermographic element comprising ultrasonic wave mixing (I) a hydrophilic photosensitive silver halide emulsion comprising a gelatino peptizer with (II) an organic solvent mixture and then ultrasonic wave mixing the resulting product with (III) comprising (a) poly(vinyl butyral) binder and (b) an oxidation-reduction image-forming composition comprising (i) silver behenate with (ii) a sulfonamidophenol reducing agent and coating the resulting composition onto a support, the improvement wherein said method comprises said mixing of (I) with (II) wherein (II) comprises (A) 2-phenoxyethanol with (B) toluene and (C) 0 to 10% by weight poly(vinyl butyral).
Claim 27
Dependent Claim
13 words
A photothermographic silver halide composition prepared by the process defined in claim 1.
Claim 28
Dependent Claim
13 words
A photothermographic silver halide composition prepared by the process defined in claim 10.
Claim 29
Dependent Claim
13 words
A photothermographic silver halide composition prepared by the process defined in claim 11.
Claim 30
Dependent Claim
11 words
A photothermographic element prepared by the process defined in claim 12.
Claim 31
Dependent Claim
11 words
A photothermographic element prepared by the process defined in claim 19.
Claim 32
Dependent Claim
11 words
A photothermographic element prepared by the process defined in claim 20.
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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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |