US4124398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thiyl bleaching agents for photographic processes
Assignee: Eastman Kodak Co
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Filing: 1977-07-11
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Granted: 1978-11-07
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Expires: 1997-07-11
Abstract
Abstract Disclosed herein are aqueous and nonaqueous photographic bleaching solutions and radiation sensitive elements comprising a thiyl bleaching agent precursor having the formula ##STR1## wherein Z comprises the nonmetallic atoms necessary to complete a 5 to 7 member heterocyclic ring; R 2 , R 3 , R 4 and R 5 are independently selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl or R 2 and R 3 or R 4 and R 5 can be taken together with the carbon atom of the ring to which they are attached to form a cycloalkyl or cycloalkenyl group; and R 1 is independently selected from the group consisting of hydrogen, oxo and a complexing ligand for silver (I) ion wherein the Ksp of the complexed product of the ligand and silver (I) ion is less than about 10 -12 at 25° C. The thiyl bleaching agents disclosed herein are capable of bleaching preformed or predeveloped metals such as silver in both aqueous and nonaqueous photographic materials. They do not adversely affect the photographic properties of radiation sensitive emulsions and can be thermally activated in a dry photothermographic process.
Inventors
- 👤 Samuel J. Ciurca, Jr.
- 👤 Carl F. Kohrt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:55
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/22; C07D295/26; C07D211/00; C07D211/92; C07D211/96; G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845; G03C5/00; G03C5/26; G03C5/40; G03C5/44
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
153 words
A photothermographic element comprising a support having thereon a layer comprising: a. a reducing agent which provides a developed image within about 90 seconds at a temperature of about 100° to 250° C. upon heating said element; b. an organic silver salt oxidizing agent; c. a silver halide; and d. a thiyl bleaching agent precursor having the formula ##STR15## wherein Z comprises the nonmetallic atoms necessary to complete a 5 to 7 member heterocyclic ring; R 2 , R 3 , R 4 and R 5 are independently selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl or R 2 and R 3 or R 4 and R 5 can be taken together with the carbon atom of the ring to which they are attached to form a cycloalkyl or cycloalkenyl having from 4 to 10 carbon atoms; and R 1 is independently selected from the group consisting of hydrogen and oxo.
Claim 2
Dependent Claim
153 words
A photothermographic element comprising a support having thereon a layer comprising: a. a reducing agent which provides a developed image within about 90 seconds at a temperature of about 100° to 250° C. upon heating said element; b. an organic silver salt oxidizing agent; c. a silver halide; and d. a thiyl bleaching agent precursor having the formula ##STR15## wherein Z comprises the nonmetallic atoms necessary to complete a 5 to 7 member heterocyclic ring; R 2 , R 3 , R 4 and R 5 are independently selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl or R 2 and R 3 or R 4 and R 5 can be taken together with the carbon atom of the ring to which they are attached to form a cycloalkyl or cycloalkenyl having from 4 to 10 carbon atoms; and R 1 is independently selected from the group consisting of hydrogen and oxo.
Claim 3
Dependent Claim
20 words
The photothermographic element of claim 1 wherein Z comprises the nonmetallic atoms necessary to complete a 6 member heterocyclic ring.
Claim 4
Dependent Claim
10 words
The photothermographic element of claim 2 wherein R is hydrogen.
Claim 5
Dependent Claim
10 words
The photothermographic element of claim 2 wherein R is oxo.
Claim 6
Dependent Claim
21 words
The photothermographic element of claim 1 wherein the organic silver salt oxidizing agent is a silver salt of a fatty acid.
Claim 7
Dependent Claim
13 words
The photothermographic element of claim 1 wherein the reducing agent is a sulfonamidophenol.
Claim 8
Dependent Claim
13 words
The photothermographic element of claim 1 which further comprises at least one binder.
Claim 9
Dependent Claim
14 words
The photothermographic element of claim 1 which further comprises at least one color-forming coupler.
Claim 10
Dependent Claim
217 words
A photothermographic element comprising a support having thereon a layer comprising: a. a reducing agent which provides a developed image within about 90 seconds at a temperature of about 100° to 250° C upon heating said element; b. an organic silver salt oxidizing agent; and c. a silver halide; and a different layer comprising a silver (I) ion complexing agent wherein the Ksp of the complexed product of silver (I) ion and the complexing agent is less than about 10 -12 at 25° C; and a thiyl bleaching agent precursor having the formula ##STR16## wherein Z comprises the nonmetallic atoms necessary to complete a 5 to 7 member heterocyclic ring; R 2 , R 3 , R 4 and R 5 are independently selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl or R 2 and R 3 or R 4 and R 5 can be taken together with the carbon atom of the ring to which they are attached to form a cycloalkyl or cycloalkenyl having from 4 to 10 carbon atoms; and R 1 is independently selected from the group consisting of hydrogen, oxo and a complexing ligand for silver (I) ion wherein the Ksp of the complexed product of the ligand and silver (I) is less than about 10 -12 at 25° C.
Claim 11
Dependent Claim
217 words
A photothermographic element comprising a support having thereon a layer comprising: a. a reducing agent which provides a developed image within about 90 seconds at a temperature of about 100° to 250° C upon heating said element; b. an organic silver salt oxidizing agent; and c. a silver halide; and a different layer comprising a silver (I) ion complexing agent wherein the Ksp of the complexed product of silver (I) ion and the complexing agent is less than about 10 -12 at 25° C; and a thiyl bleaching agent precursor having the formula ##STR16## wherein Z comprises the nonmetallic atoms necessary to complete a 5 to 7 member heterocyclic ring; R 2 , R 3 , R 4 and R 5 are independently selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl or R 2 and R 3 or R 4 and R 5 can be taken together with the carbon atom of the ring to which they are attached to form a cycloalkyl or cycloalkenyl having from 4 to 10 carbon atoms; and R 1 is independently selected from the group consisting of hydrogen, oxo and a complexing ligand for silver (I) ion wherein the Ksp of the complexed product of the ligand and silver (I) is less than about 10 -12 at 25° C.
Claim 12
Dependent Claim
20 words
The photothermographic element of claim 9 wherein Z comprises the nonmetallic atoms necessary to complete a 6 member heterocyclic ring.
Claim 13
Dependent Claim
10 words
The photothermographic element of claim 10 wherein R is hydrogen.
Claim 14
Dependent Claim
10 words
The photothermographic element of claim 10 wherein R is oxo.
Claim 15
Dependent Claim
13 words
The photothermographic element of claim 10 wherein R is the complexing ligand ##STR17##
Claim 16
Dependent Claim
21 words
The photothermographic element of claim 9 wherein the organic silver salt oxidizing agent is a silver salt of a fatty acid.
Claim 17
Dependent Claim
13 words
The photothermographic element of claim 9 wherein the reducing agent is a sulfonamidophenol.
Claim 18
Dependent Claim
13 words
The photothermographic element of claim 9 which further comprises at least one binder.
Claim 19
Dependent Claim
14 words
The photothermographic element of claim 9 which further comprises at least one color-forming coupler.
Claim 20
Dependent Claim
14 words
The photothermographic element of claim 9 wherein the complexing agent is an onium halide.
Claim 21
Dependent Claim
68 words
A photothermographic element comprising a support having thereon a layer comprising: a. a sulfonamidophenol reducing agent; b. a silver behenate-behenic acid dispersion; c. a silver bromoiodide; d. a poly(vinyl butyral) binder; and e. at least one color-forming coupler; and another layer comprising a silver (I) ion complexing onium halide; and in the same or different layer, a thiyl bleaching agent precursor selected from the group consisting of ##STR18##
Claim 22
Dependent Claim
68 words
A photothermographic element comprising a support having thereon a layer comprising: a. a sulfonamidophenol reducing agent; b. a silver behenate-behenic acid dispersion; c. a silver bromoiodide; d. a poly(vinyl butyral) binder; and e. at least one color-forming coupler; and another layer comprising a silver (I) ion complexing onium halide; and in the same or different layer, a thiyl bleaching agent precursor selected from the group consisting of ##STR18##
Claim 23
Dependent Claim
188 words
In a process for producing a photographic image comprising the steps of (1) exposure of a photothermographic element to light, said element comprising a support having thereon a layer comprising a reducing agent which provides a developed image within about 90 seconds at a temperature of about 100° to 250° C upon heating said element; an organic silver salt oxidizing agent; and a silver halide; and (2) thermal development at a temperature above about 80° C, the improvement comprising incorporation into the photothermographic element of a thiyl bleaching agent precursor having the formula ##STR19## wherein Z comprises the nonmetallic atoms necessary to complete a 5 to 7 member heterocyclic ring; R 2 , R 3 , R 4 and R 5 are independently selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl or R 2 and R 3 or R 4 and R 5 can be taken together with the carbon atom of the ring to which they are attached to form a cycloalkyl or cycloalkenyl having from 4 to 10 carbon atoms; and R 1 is independently selected from the group consisting of hydrogen and oxo.
Claim 24
Dependent Claim
188 words
In a process for producing a photographic image comprising the steps of (1) exposure of a photothermographic element to light, said element comprising a support having thereon a layer comprising a reducing agent which provides a developed image within about 90 seconds at a temperature of about 100° to 250° C upon heating said element; an organic silver salt oxidizing agent; and a silver halide; and (2) thermal development at a temperature above about 80° C, the improvement comprising incorporation into the photothermographic element of a thiyl bleaching agent precursor having the formula ##STR19## wherein Z comprises the nonmetallic atoms necessary to complete a 5 to 7 member heterocyclic ring; R 2 , R 3 , R 4 and R 5 are independently selected from the group consisting of alkyl, cycloalkyl, aralkyl, aryl or R 2 and R 3 or R 4 and R 5 can be taken together with the carbon atom of the ring to which they are attached to form a cycloalkyl or cycloalkenyl having from 4 to 10 carbon atoms; and R 1 is independently selected from the group consisting of hydrogen and oxo.
References Cited (Backward Citations)
JPS5142529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |