US4504568A
Expired / Lapsed
US
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Sensitive silver halide photothermographic materials for producing dye images
Assignee: Eastman Kodak Co
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Filing: 1984-02-02
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Granted: 1985-03-12
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Expires: 2004-02-02
Abstract
Abstract A dye-forming photothermographic element comprises in a binder, in reactive association, (a) photographic silver halide, (b) an image forming combination comprising (i) a reducible organic silver salt with (ii) a reducing agent selected from the group consisting of p-phenylenediamine, p-aminophenol, sulfonamidophenol, sulfonamidoaniline and hydrazone developing agents, and (c) a coupler which is capable of forming an image dye by reaction with the oxidized form of the reducing agent. In such a photothermographic element improvements are provided wherein the coupler has attached to the carbon atom at the coupling position either (A) a group --S--Dye, wherein Dye represents an image dye, or a blocked or shifted form thereof, and any necessary linking group, or (B) a moiety --S--Z, wherein Z represents atoms linking the sulfur atom to another position in the coupler. The exposed dye-forming photothermographic element is capable of forming a dye image by merely heating the element. The dye-forming photothermographic element can be a diffusion transfer photothermographic element in which the image dye formed upon heating the exposed element is capable of being transferred to an image receiver.
Inventors
- 👤 Bernard A. Clark
- 👤 Michael J. Simons
- 👤 Colin Holstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:26
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/40; G03C8/4013; G03C8/4033; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845; G03C1/49854
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
102 words
In dye-forming photothermographic element comprising a support bearing, in a binder, in reactive association, (a) photographic silver halide, (b) an image forming combination comprising (i) a reducible organic silver salt and (ii) a reducing agent selected from the group consisting of p-phenylenediamine, p-aminophenol, sulfonamidophenol, sulfonamidoaniline and hydrazone developing agents, and (c) a coupler which is capable of reacting with the oxidized form of said reducing agent to form a dye, the improvement wherein said coupler has attached to a carbon atom at the coupling position a moiety --S--Z--, wherein --Z-- represents atoms linking the sulfur atom to another position in the coupler.
Claim 2
Dependent Claim
102 words
In dye-forming photothermographic element comprising a support bearing, in a binder, in reactive association, (a) photographic silver halide, (b) an image forming combination comprising (i) a reducible organic silver salt and (ii) a reducing agent selected from the group consisting of p-phenylenediamine, p-aminophenol, sulfonamidophenol, sulfonamidoaniline and hydrazone developing agents, and (c) a coupler which is capable of reacting with the oxidized form of said reducing agent to form a dye, the improvement wherein said coupler has attached to a carbon atom at the coupling position a moiety --S--Z--, wherein --Z-- represents atoms linking the sulfur atom to another position in the coupler.
Claim 3
Dependent Claim
64 words
A dye-forming photothermographic element as in claim 1 wherein said coupler is a compound represented by the formula: ##STR46## wherein: X and Y are moieties which confer coupling activity on the carbon atom shown in the formula; the broken line between X and Y represents linking atoms or a separation of X and Y; and Z represents atoms necessary to link Z and Y.
Claim 4
Dependent Claim
49 words
A dye-forming photothermographic element as in claim 1 wherein said coupler is a compound represented by the formula: ##STR47## wherein: R' is hydrogen or a substituent group which does not adversely affect coupling action of said coupler; and Z represents atoms necessary to link Z to the pyrazolone ring.
Claim 5
Dependent Claim
55 words
A dye-forming photothermographic element as in claim 1 wherein said coupler is a compound represented by the formula: ##STR48## wherein: n is 0, 1 or 2; R', R" and R'" are individually hydrogen; a substituent which does not adversely affect coupling action of said coupler; or any or R" and R'" together complete a ring.
Claim 6
Dependent Claim
80 words
A dye-forming photothermographic element as in claim 1 wherein said coupler is a compound represented by the formula: ##STR49## wherein: R 4 is hydrogen or an unsubstituted or substituted alkyl, cycloalkyl, aryl or heterocyclic group; R 5 , R 6 , R 7 and R 8 are individually hydrogen or an unsubstituted or substituted alkyl or aryl group; or R 5 and R 6 together or R 7 and R 8 together represent the atoms necessary to complete a ring.
Claim 7
Dependent Claim
65 words
A dye-forming photothermographic element as in claim 1 wherein said coupler is a compound represented by the formula: ##STR50## wherein: R 4 is hydrogen or an unsubstituted or substituted alkyl, cycloalkyl, aryl or heterocyclic group; R 11 is hydrogen, unsubstituted or substituted alkyl, or acyl group; and R 12 is hydrogen or a substituent group which does not adversely affect coupling action of said coupler.
Claim 8
Dependent Claim
54 words
A dye-forming photothermographic element as in claim 1 wherein said coupler is a compound represented by the formula: ##STR51## wherein: R 4 is hydrogen or an unsubstituted or substituted alkyl, cycloalkyl, aryl or heterocyclic group; and R 12 is hydrogen or a substituent group which does not adversely affect coupling action of said coupler.
Claim 9
Dependent Claim
13 words
A dye-forming photothermographic element as in claim 1 wherein said coupler is: ##STR52##
Claim 10
Dependent Claim
25 words
A dye-forming photothermographic element as in claim 1 wherein said binder is hydrophilic and said photographic silver halide is a gelatino silver halide photographic emulsion.
Claim 11
Dependent Claim
26 words
A dye-forming photothermographic element as in claim 1 comprising an image receiving layer separated from the remaining components of said element by an opaque white layer.
Claim 12
Dependent Claim
124 words
In a dye-forming, integral diffusion transfer photothermographic element comprising, in sequence, (A) a transparent support bearing (B) a dye mordant layer, (C) an opacifying layer and (D) at least one photothermographic layer comprising in a binder, (a) photographic silver halide, (b) an image forming combination comprising (i) a reducible organic silver salt and (ii) a reducing agent selected from the group consisting of p-phenylenediamine, p-aminophenol, sulfonamidophenol, sulfonamidoaniline and hydrazone developing agents, and (c) a coupler which is capable of reacting with the oxidized form of said reducing agent to form a dye, the improvement wherein said coupler has attached to a carbon atom at the coupling position a moiety --S--Z--, wherein --Z-- represents atoms linking the sulfur atom to another position in the coupler.
Claim 13
Dependent Claim
124 words
In a dye-forming, integral diffusion transfer photothermographic element comprising, in sequence, (A) a transparent support bearing (B) a dye mordant layer, (C) an opacifying layer and (D) at least one photothermographic layer comprising in a binder, (a) photographic silver halide, (b) an image forming combination comprising (i) a reducible organic silver salt and (ii) a reducing agent selected from the group consisting of p-phenylenediamine, p-aminophenol, sulfonamidophenol, sulfonamidoaniline and hydrazone developing agents, and (c) a coupler which is capable of reacting with the oxidized form of said reducing agent to form a dye, the improvement wherein said coupler has attached to a carbon atom at the coupling position a moiety --S--Z--, wherein --Z-- represents atoms linking the sulfur atom to another position in the coupler.
Claim 14
Dependent Claim
41 words
A method of forming a dye image in an exposed photothermographic element as defined in claim 1 comprising heating said element to a temperature within the range of about 80° C. to about 200° C. until said dye image is formed.
Claim 15
Dependent Claim
53 words
A method of forming a dye image in an exposed photothermographic element as defined in claim 1 comprising heating said element to a temperature within the range of about 80° C. to about 200° C. until said dye image is formed and then transferring the resulting dye image to an image receiving layer.
Claim 16
Dependent Claim
57 words
A method of forming a dye image in an exposed, dye-forming, integral diffusion transfer photothermographic element as defined in claim 11 comprising heating said element to a temperature within the range of about 80° C. to about 200° C. until said dye image is formed and then transferring the resulting dye image to said dye mordant layer.
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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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |