Patent US4353975A successfully refreshed from Google Patents.
US4353975A
Expired / Lapsed
US
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Dye-diffusion transfer process
Assignee: Agfa Gevaert NV
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Filing: 1981-08-12
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Granted: 1982-10-12
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Expires: 2001-08-12
Abstract
Abstract A dye-diffusion transfer process for producing (a) dye image(s) with improved dye density is provided, said process comprising the steps of: (1) image-wise photo-exposing a photographic color material, which contains at least one alkali-permeable silver halide hydrophilic colloid layer which contains in operative contact therewith or therein a non-diffusing dye or dye precursor compound that when contacted with an aqueous alkaline liquid remains immobile in an alkali-permeable colloid layer and is capable of being reduced by a silver halide developing agent at a rate slower than that of imagewise developable silver halide and in reduced state under alkaline conditions is capable of releasing a diffusible dye or dye precursor moiety, and (2) applying in the presence of a developing agent an aqueous alkaline liquid to said photoexposed material, characterized in that said liquid contains triisopropanolamine.
Inventors
- 👤 Wilhelmus Janssens
- 👤 Daniel A. Claeys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:50
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/22; G03C7/00; G03C7/30; G03C7/407; G03C7/413; G03C8/32; G03C8/36
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A process for the production of (a) dye image(s) by dye diffusion transfer comprising the steps of: (1) image-wise photo-exposing a photographic colour material, which contains at least one alkali-permeable silver halide hydrophilic colloid layer which contains in operative contact therewith or therein a non-diffusing dye or dye precursor compound that when contacted with an aqueous alkaline liquid remains immobile in an alkali-permeable colloid layer of said material and is capable of being reduced by a silver halide developing agent at a rate slower than the reduction of image-wise developable silver halide of said silver halide hydrophilic colloid layer and in reduced state under alkaline conditions is capable of releasing a diffusible dye or dye precursor moiety, and (2) applying an aqueous alkaline liquid to said photoexposed material effecting development in the presence of a developing agent and effecting with said liquid diffusion-transfer of said diffusible dye or dye precursor moiety to a receiving layer, characterized in that said liquid contains triisopropanolamine.
Claim 2
Dependent Claim
162 words
A process for the production of (a) dye image(s) by dye diffusion transfer comprising the steps of: (1) image-wise photo-exposing a photographic colour material, which contains at least one alkali-permeable silver halide hydrophilic colloid layer which contains in operative contact therewith or therein a non-diffusing dye or dye precursor compound that when contacted with an aqueous alkaline liquid remains immobile in an alkali-permeable colloid layer of said material and is capable of being reduced by a silver halide developing agent at a rate slower than the reduction of image-wise developable silver halide of said silver halide hydrophilic colloid layer and in reduced state under alkaline conditions is capable of releasing a diffusible dye or dye precursor moiety, and (2) applying an aqueous alkaline liquid to said photoexposed material effecting development in the presence of a developing agent and effecting with said liquid diffusion-transfer of said diffusible dye or dye precursor moiety to a receiving layer, characterized in that said liquid contains triisopropanolamine.
Claim 3
Dependent Claim
40 words
A process according to claim 1, characterized in that the non-diffusing dye or dye precursor compound is a ballasted compound capable of undergoing an electron-accepting nucleophilic displacement reaction separating hereby in alkaline medium a diffusible dye or dye precursor moiety.
Claim 4
Dependent Claim
42 words
A process according to claim 1, characterized in that the non-diffusing dye or dye precursor compound is a ballasted compound capable of being split by reduction under alkaline conditions into a ballasted quinonemethide compound and a diffusible dye or dye precursor moiety.
Claim 5
Dependent Claim
84 words
A process according to claim 1, characterized in that the process is carried out with a mixture of reducing agents consisting of electron donors and electron-transfer agents the latter being better silver halide reducing agents under the applied conditions of processing than the electron donors and wherein the electron transfer agents function to develop the silver halide and provide a corresponding image-wise pattern of oxidised electron donor compounds which compounds in unoxidised form are capable of reducing said non-diffusible dye or dye precursor compound.
Claim 6
Dependent Claim
39 words
A process according to claim 4, characterized in that said electron transfer agent is used as developing agent in diffusible state in the photographic material in (a) hydrophilic colloid layer(s) adjacent to one or more silver halide emulsion layers.
Claim 7
Dependent Claim
32 words
A process according to claim 4, characterized in that said electron donor is used in non-diffusible state in each silver halide emulsion layer containing said different non-diffusing dye or dye precursor compound.
Claim 8
Dependent Claim
17 words
A process according to claim 4, characterized in that the electron transfer agent is a 3-pyrazolidinone compound.
Claim 9
Dependent Claim
15 words
A process according to claim 6, characterized in that the electron donor is ascorbyl palmitate.
Claim 10
Dependent Claim
49 words
A process according to claim 4, characterized in that the electron donor compound is used in the photographic material in a molar range of 1:2 to 4:1 with respect to the non-diffusing dye or dye precursor compound and the electron transfer agent is applied in the same molar range.
Claim 11
Dependent Claim
139 words
A process according to claim 1, characterized in that the photographic multicolour material comprises a support, which is coated in successive order with (1) a red-sensitive silver halide emulsion layer containing a non-diffusing electron donor compound and a non-diffusing dye compound comprising a diffusible moiety providing a cyan image dye, (2) a hydrophilic colloid interlayer containing a diffusible electron transfer compound, (3) a green-sensitive silver halide emulsion layer containing a non-diffusing electron donor compound, and a non-diffusing dye compound comprising a diffusible moiety providing a magenta image dye, (4) a hydrophilic colloid interlayer containing a diffusible electron transfer compound, (5) a blue-sensitive silver halide emulsion layer containing a non-diffusing electron donor compound and a non-diffusing dye compound comprising a diffusible moiety providing a yellow image dye, and (6) a protective hydrophilic colloid layer, containing a diffusible electron transfer compound.
Claim 12
Dependent Claim
20 words
A process according to claim 1, characterized in that a silver halide solvent is contained in said aqueous alkaline liquid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |