US3928037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium dioxide with aluminum oxide or aluminium oxide plus silicon dioxide precipitated thereon as pigment for diffusion transfer
Assignee: Agfa Gevaert NV
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Filing: 1974-05-15
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Granted: 1975-12-23
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Expires: 1994-05-15
Abstract
Abstract Photographic diffusion transfer reversal process in which a positive diffusion transfer reversal image is formed in a lightsensitive monosheet material, wherein said image is made visible against a white pigment layer that covers the negative image produced in the monosheet, wherein said white pigment layer contains a white titanium dioxide pigment that has been modified by precipitation thereon of hydrated aluminium oxide or of hydrated aluminium oxide together with hydrated silicon dioxide.
Inventors
- 👤 Haes Louis Maria De
- 👤 Hans-Georg Volz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:39
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/44; G03C8/48
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
169 words
IN A PHOTOGRAPHIC DIFFUSION TRANSFER REVERSAL PROCESS IN WHICH A PHOTO-SENSITIVE SILVER HALIDE EMULSION LAYER IS EXPOSED AND DEVELOPED TO FORM A VISIBLE NEGATIVE SILVER IMAGE IN THE EMULSION LAYER AND TO TRANSFER EITHER A SILVER HALIDE COMPLEX OR A DYE TO AN IMAGE RECEIVING A LAYER TO MAKE A SILVER IMAGE OR DYE IMAGE VISIBLE AGAINST A WHITE PIGMENT BACKGROUND LAYER COVERING SAID NEGATIVE SILVER IMAGE WHEREIN SAID SILVER HALIDE EMULSION LAYER FORMS PART OF A MONOSHEET MATERIAL COMPRISING IN ORDER, EITHER A. A NON-TRANSPARENT SUPPORT, A SILVER HALIDE EMULSION LAYER A PIGMENT LAYER OR MEANS FOR APPLYING A PIGMENT LAYER AND AN IMAGE RECEIVING LAYER OR B. A TRANSPARENT SUPPORT AN IMAGE RECEIVING LAYER, A PIGMENT LAYER OR MEANS FOR APPLYING A PIGMENT LAYER, AND A SILVER HALIDE EMULSION LAYER, THE IMPROVEMENT WHEREIN THE PIGMENT PARTICLES OF THE PIGMENT LAYER CONSISTS ESSENTIALLY OF WHITE TITANIUM DIOXIDE PIGMENT PARTICLES THAT HAVE BEEN MODIFIED BY PRECIPITATION THEREON OF HYDRATED ALUMINUM OXIDE ALONE OR IN ADMIXTURE WITH HYDRATED SILICON DIOXIDE.
Claim 2
Dependent Claim
169 words
IN A PHOTOGRAPHIC DIFFUSION TRANSFER REVERSAL PROCESS IN WHICH A PHOTO-SENSITIVE SILVER HALIDE EMULSION LAYER IS EXPOSED AND DEVELOPED TO FORM A VISIBLE NEGATIVE SILVER IMAGE IN THE EMULSION LAYER AND TO TRANSFER EITHER A SILVER HALIDE COMPLEX OR A DYE TO AN IMAGE RECEIVING A LAYER TO MAKE A SILVER IMAGE OR DYE IMAGE VISIBLE AGAINST A WHITE PIGMENT BACKGROUND LAYER COVERING SAID NEGATIVE SILVER IMAGE WHEREIN SAID SILVER HALIDE EMULSION LAYER FORMS PART OF A MONOSHEET MATERIAL COMPRISING IN ORDER, EITHER A. A NON-TRANSPARENT SUPPORT, A SILVER HALIDE EMULSION LAYER A PIGMENT LAYER OR MEANS FOR APPLYING A PIGMENT LAYER AND AN IMAGE RECEIVING LAYER OR B. A TRANSPARENT SUPPORT AN IMAGE RECEIVING LAYER, A PIGMENT LAYER OR MEANS FOR APPLYING A PIGMENT LAYER, AND A SILVER HALIDE EMULSION LAYER, THE IMPROVEMENT WHEREIN THE PIGMENT PARTICLES OF THE PIGMENT LAYER CONSISTS ESSENTIALLY OF WHITE TITANIUM DIOXIDE PIGMENT PARTICLES THAT HAVE BEEN MODIFIED BY PRECIPITATION THEREON OF HYDRATED ALUMINUM OXIDE ALONE OR IN ADMIXTURE WITH HYDRATED SILICON DIOXIDE.
Claim 3
Dependent Claim
43 words
Process according to claim 1, wherein said light-sensitive silver halide emulsion layer is exposed image-wise and treated with an aqueous alkaline processing liquid in the presence of a developing agent and said white modified titanium dioxide pigment is applied from the processing liquid.
Claim 4
Dependent Claim
17 words
Process according to the claim 1, wherein the titanium dioxide pigment has the rutile or anatase structure.
Claim 5
Dependent Claim
36 words
Process according to claim 1, wherein the modified titanium dioxide pigment contains hydrated aluminium oxide (calculated in the form of Al2O3) in an amount of 0.5 to 20% by weight in respect of the titanium dioxide.
Claim 6
Dependent Claim
43 words
Process according to claim 1, wherein the modified titanium dioxide pigment comprises in addition to the hydrated aluminium oxide hydrated silicon dioxide (calculated in the form of SiO2) in an amount of 0.1 to 20% by weight in resPect of the titanium dioxide.
Claim 7
Dependent Claim
19 words
Process according to claim 1, wherein the size of the pigment particles is between 0.05 and 0.5 Mu m.
Claim 8
Dependent Claim
38 words
Process according to claim 2, wherein substantially the total amount of developing agent for developing said exposed emulsion layer is contained in the photographic monosheet material and said aqueous alkaline processing liquid is substantially free from developing agents.
Claim 9
Dependent Claim
17 words
Process according to claim 2, wherein the aqueous alkaline processing liquid comprises an agent increasing its viscosity.
Claim 10
Dependent Claim
27 words
Process according to claim 2, wherein development nuclei are supplied to at least the surface of the pigment layer from a liquid applied after the image-wise exposure.
Claim 11
Dependent Claim
103 words
In a photographic supported monosheet material adapted for the production of a visible transfer image on a white background by diffusion transfer of either silver halide complexes or dyes, which material comprises in order a non-transparent support, a silver halide emulsion layer, a pigment layer or means for applying a pigment layer, and an image receiving layer, the improvement wherein the pigment particles of said pigment layer or means for applying said pigment layer consist essentially of white titanium dioxide pigment particles that have been modified by precipitation thereon of hydrated aluminum oxide or of hydrated aluminum oxide together with hydrated silicon dioxide.
Claim 12
Dependent Claim
103 words
In a photographic supported monosheet material adapted for the production of a visible transfer image on a white background by diffusion transfer of either silver halide complexes or dyes, which material comprises in order a non-transparent support, a silver halide emulsion layer, a pigment layer or means for applying a pigment layer, and an image receiving layer, the improvement wherein the pigment particles of said pigment layer or means for applying said pigment layer consist essentially of white titanium dioxide pigment particles that have been modified by precipitation thereon of hydrated aluminum oxide or of hydrated aluminum oxide together with hydrated silicon dioxide.
Claim 13
Dependent Claim
45 words
Photographic material according to claim 10, wherein a titanium dioxide pigment and the binder for the pigment particles are present in amounts of 9 to 25 g per sq.m and 0.5 to 3 g per sq.m respectively, the material containing at least one developing agent.
Claim 14
Dependent Claim
15 words
Photographic material according to claim 11, containing hydroquinone and a 1-phenyl-3-pyrazolidinone compound as developing agents.
Claim 15
Dependent Claim
24 words
Photographic material according to claim 12, wherein the developing agents are used in amounts of approximatively 100 mg to approximatively 500 mg per sq.m.
Claim 16
Dependent Claim
16 words
Photographic material according to claim 10, containing at least one spectrally sensitized silver halide emulsion layer.
Claim 17
Dependent Claim
29 words
Photographic material according to claim 10, wherein the support is a paper support, which has been made non-transparent in the mass or by application thereto of a non-transparent coating.
Claim 18
Dependent Claim
15 words
Photographic material according to claim 10, wherein the support is a hydrophobic polymer film support.
Claim 19
Dependent Claim
21 words
Photographic material according to claim 10, wherein development nuclei are provided in the at least the surface of the pigment layer.
Claim 20
Dependent Claim
103 words
In a photographic supported monosheet material adapted for the production of a visible transfer image on a white background by diffusion transfer of either silver halide complexes or dyes, which material comprises in order a transparent support, an image receiving layer, a pigment layer or means to apply a pigment layer and the silver halide emulsion layer, the improvement wherein the pigment particles of said pigment layer or means for applying said pigment layer consist essentially of white titanium dioxide pigment particles that have been modified by precipitation thereon of hydrated aluminum oxide or of hydrated aluminum oxide together with hydrated silicon dioxide.
Claim 21
Dependent Claim
103 words
In a photographic supported monosheet material adapted for the production of a visible transfer image on a white background by diffusion transfer of either silver halide complexes or dyes, which material comprises in order a transparent support, an image receiving layer, a pigment layer or means to apply a pigment layer and the silver halide emulsion layer, the improvement wherein the pigment particles of said pigment layer or means for applying said pigment layer consist essentially of white titanium dioxide pigment particles that have been modified by precipitation thereon of hydrated aluminum oxide or of hydrated aluminum oxide together with hydrated silicon dioxide.
Claim 22
Dependent Claim
43 words
Photographic material according to claim 18, wherein the titanium dioxide pigment and a binder for the pigment particles are present in amounts of 9-25 g per sq.m and 0.5 to 3 g per sq.m respectively, the material containing at least one developing agent.
Claim 23
Dependent Claim
15 words
Photographic material according to claim 19, containing hydroquinone and a 1-phenyl-3-pyrazolidinone compound as developing agents.
Claim 24
Dependent Claim
24 words
Photographic material according to claim 20, wherein the developing agents are used in amounts of approximately 100 mg to approximately 500 mg per sq.m.
Claim 25
Dependent Claim
30 words
Photographic material according to claim 18, successively having a flexible transparent support, an image-receiving layer coNtaining development nuclei, a layer containing the modified titanium dioxide pigment and a colloid binder.
Claim 26
Dependent Claim
16 words
Photographic material according to claim 18, containing at least one spectrally sensitized silver halide emulsion layer.
Claim 27
Dependent Claim
15 words
Photographic material according to claim 18, wherein the support is a hydrophobic polymer film support.
Claim 28
Dependent Claim
20 words
Photographic material according to claim 18, wherein development nuclei are provided in at least the surface of the pigment layer.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |