Patent US4440849A successfully refreshed from Google Patents.
US4440849A
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Dye diffusion transfer process with development accelerators
Assignee: Agfa Gevaert AG
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Filing: 1982-06-21
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Granted: 1984-04-03
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Expires: 2002-06-21
Abstract
Abstract The invention relates to a process for the production of colored images by the dye diffusion transfer principle, in which a color photographic recording material containing negative silver halide emulsions and reducible color-providing compounds is developed with an alkaline developer preparation containing a combination of at least one compound from each of at least two of the groups of compounds (A, B, C) defined below as development accelerators. With combinations of this type, equal or higher maximum color densities are obtained for a smaller overall quantity of development accelerator. A: a 1,3-diol containing from 3 to 10 carbon atoms B: a cyclohexane dimethanol or cyclohexene dimethanol C: an aryl alkanol or aroxyalkanol containing from 7 to 12 carbon atoms.
Inventors
- 👤 Werner Krafft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:26
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/32; G03C8/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A process for the production of colored images by the dye diffusion transfer process in which an imagewise exposed color photographic recording material, comprising at least one photosensitive silver halide emulsion layer and, associated therewith, a non-diffusing color-providing compound, is developed in surface-to-surface contact with an image-receiving layer using a developer preparation containing a development accelerator, wherein the improvement comprises 1. the color photographic recording material used is one which contains, in association with at least one negative silver halide emulsion layer, a combination of a non-diffusing reducible color providing compound and an ED-compound, and 2.
Claim 2
Dependent Claim
96 words
A process for the production of colored images by the dye diffusion transfer process in which an imagewise exposed color photographic recording material, comprising at least one photosensitive silver halide emulsion layer and, associated therewith, a non-diffusing color-providing compound, is developed in surface-to-surface contact with an image-receiving layer using a developer preparation containing a development accelerator, wherein the improvement comprises 1. the color photographic recording material used is one which contains, in association with at least one negative silver halide emulsion layer, a combination of a non-diffusing reducible color providing compound and an ED-compound, and 2.
Claim 3
Dependent Claim
77 words
the developer preparation used is one which contains, as development accelerator, a combination of two of the compounds A and B or a combination of a compound C with at least one compound of A and B defined in the following of which A is an aliphatic 1,3-diol selected from the group consisting of 1,3-propane diol, 1,3-butane diol, 2,2-dimethyl-1,3-propane-diol, 2-methyl-2-propyl-1,3-propane diol, 2,2-diethyl-1,3-propane diol, 2-ethyl-1,3-hexane diol, 2-methyl-2,4-pentane diol, 2,2,4-trimethyl-1,3-pentane diol and 1,3-diethyl-2-methyl-1,3-propane diol, B is 1,4-cyclohexane dimethanol, and
Claim 4
Dependent Claim
77 words
the developer preparation used is one which contains, as development accelerator, a combination of two of the compounds A and B or a combination of a compound C with at least one compound of A and B defined in the following of which A is an aliphatic 1,3-diol selected from the group consisting of 1,3-propane diol, 1,3-butane diol, 2,2-dimethyl-1,3-propane-diol, 2-methyl-2-propyl-1,3-propane diol, 2,2-diethyl-1,3-propane diol, 2-ethyl-1,3-hexane diol, 2-methyl-2,4-pentane diol, 2,2,4-trimethyl-1,3-pentane diol and 1,3-diethyl-2-methyl-1,3-propane diol, B is 1,4-cyclohexane dimethanol, and
Claim 5
Dependent Claim
93 words
C is phenoxyethanol. 2. A recording material as claimed in claim 1, wherein the color-providing compound used corresponds to the following formula ##STR7## in which X represents the residue of a diffusible dye or dye precursor, R 1 , R 2 and R 3 represent hydrogen, halogen, alkyl, alkoxy, aryl or acylamino, or R 2 and R 3 complete a fused ring, R 4 represents hydrogen or alkyl, at least one of the radicals R 1 , R 2 , R 3 and R 4 containing a radical which imparts resistance to diffusion.
Claim 6
Dependent Claim
24 words
A process as claimed in claim 1 wherein the developer preparation contains cyclo hexane-1,4-dimethanol in combination with 2,2-diethyl-1,3-propane diol, 2-methyl-2-propyl-1,3-propane diol or 2,2,4-trimethyl-1,3-propane diol.
Claim 7
Dependent Claim
24 words
A process as claimed in claim 1 wherein the developer preparation contains 2-phenoxy ethanol in combination with 2,2-diethyl-1,3-propane diol, 2-methyl-2-propyl-1,3-propane diol or 2,2,4-trimethyl-1,3-propane diol.
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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) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |