Claims
- 1. A preparation process for a first aqueous dispersion comprising an ex-situ photosensitive silver halide and a substantially light-insensitive silver salt of an organic carboxylic acid, comprising the steps of: separately preparing a second aqueous dispersion comprising said ex-situ photosensitive silver halide and a third aqueous dispersion comprising said substantially light-insensitive silver salt of an organic carboxylic acid; and mixing said second aqueous dispersion with said third aqueous dispersion to produce a mixture thereof, wherein said first aqueous dispersion thereby produced is substantially free of a water-soluble metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said second aqueous dispersion to a value of at least 8.0 prior to mixing with said third aqueous dispersion; increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to mixing with said second aqueous dispersion; and increasing the pH of said mixture to a value of at least 8.0.
- 2. Preparation process according to claim 1, wherein said third aqueous dispersion further comprises a first in situ photosensitive silver halide.
- 3. Preparation process according to claim 1, wherein said pH value of at least 8.0 is attained by addition of ammonia.
- 4. Preparation process according to claim 1, wherein said substantially light-insensitive silver salt of an organic carboxylic acid is a silver salt of an aliphatic carboxylic acid greater than 12 carbon atoms.
- 5. Preparation process according to claim 1, wherein said process further includes a step of adding a water-soluble silver salt having a solubility in water at 20° C. of greater than 0.1 g/L at any stage in said preparation process.
- 6. A first aqueous dispersion comprising an ex-situ photosensitive silver halide and a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and having a pH at or above 8.0 obtained by a process comprising the steps of: separately preparing a second aqueous dispersion comprising said ex-situ photosensitive silver halide and a third aqueous dispersion comprising said substantially light-insensitive silver salt of an organic carboxylic acid; and mixing said second aqueous dispersion with said third aqueous dispersion to produce a mixture thereof, wherein said first aqueous dispersion thereby produced is substantially free of a water-soluble metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said second aqueous dispersion to a value of at least 8.0 prior to mixing with said third aqueous dispersion; increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to mixing with said second aqueous dispersion; and increasing the pH of said mixture to a value of at least 8.0.
- 7. First aqueous dispersion according to claim 6, wherein said first aqueous dispersion further contains a reducing agent for said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms.
- 8. A process for preparing a layer of a photo-addressable thermally developable element of a photothermographic recording material, said photo-addressable thermally developable element comprising photosensitive silver halide, a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms, a reducing agent therefor in thermal working relationship therewith and a binder, comprising the steps of: (i) preparing a first aqueous dispersion comprising an ex-situ photosensitive silver halide and a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms, comprising the steps of: separately preparing a second aqueous dispersion comprising said ex-situ photosensitive silver halide and third aqueous dispersion comprising said substantially light-insensitive silver salt of an organic carboxylic acid; and mixing said second aqueous dispersion with said third aqueous dispersion to produce a mixture thereof, wherein said first aqueous dispersion thereby produced is substantially free of a water-soluble metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said second aqueous dispersion to a value of at least 8.0 prior to mixing with said third aqueous dispersion; increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to mixing with said second aqueous dispersion; and increasing the pH of said mixture to a value of at least 8.0; and (ii) coating said first aqueous dispersion on a support.
- 9. A preparation process for a fourth aqueous dispersion comprising a second in-situ photosensitive silver halide and a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms, comprising the steps of: (i) providing a third aqueous dispersion comprising said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and (ii) partially converting said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms in said third aqueous dispersion with a non-fluoro halide ion source into said second in-situ photosensitive silver halide thereby producing said fourth aqueous dispersion; wherein said fourth aqueous dispersion thereby produced is substantially free of a water-soluble metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to step (ii); increasing the pH of the third aqueous dispersion to a value of at least 8.0 during step (ii); and increasing the pH of said aqueous dispersion resulting from step (ii) to a value of at least 8.0.
- 10. Preparation process according to claim 9, wherein said pH value of at least 8.0 is attained by addition of ammonia.
- 11. Preparation process according to claim 9, wherein said process further includes a step of adding a water-soluble silver salt having a solubility in water at 20° C. of greater than 0.1 g/L at any stage in said preparation process.
- 12. A fourth aqueous dispersion comprising a second in-situ photosensitive silver halide and a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and having a pH at or above 8.0 obtained by a process comprising the steps of: (i) providing a third aqueous dispersion comprising said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and (ii) partially converting said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms in said third aqueous dispersion with a non-fluoro halide ion source into said second in-situ photosensitive silver halide thereby producing said fourth aqueous dispersion; wherein said fourth aqueous dispersion thereby produced is substantially free of a water-soluble metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to step (ii); increasing the pH of the third aqueous dispersion to a value of at least 8.0 during step (ii); and increasing the pH of said aqueous dispersion resulting from step (ii) to a value of at least 8.0.
- 13. Fourth aqueous dispersion according to claim 12, wherein said fourth aqueous dispersion further contains a reducing agent for said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms.
- 14. A process for preparing a layer of a photo-addressable thermally developable element of a photothermographic recording material, said photo-addressable thermally developable element comprising photosensitive silver halide, a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms, a reducing agent therefor in thermal working relationship therewith and a binder, comprising the steps of: (i) preparing a fourth aqueous dispersion comprising a second in-situ photosensitive silver halide and a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms, comprising the steps of: (I) providing a third aqueous dispersion comprising said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and (II) partially converting said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms in said third aqueous dispersion with a non-fluoro halide ion source into said second in-situ photosensitive silver halide thereby producing said fourth aqueous dispersion; wherein said fourth aqueoud dispersion thereby produced is substantially free of a water-solube metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to step (II); increasing the pH of third aqueous dispersion to a value of at least 8.0 during step (II); and increasing the pH of said aqueous dispersion resulting from step (II) to a value of at least 8.0; and (ii) coating said fourth aqueous dispersion on a support.
- 15. A photothermographic recording material comprising a photo-addressable thermally developable element, wherein the photo-addressable thermally developable element comprises a layer produced with a first dispersion, wherein the first aqueous dispersion comprises an ex-situ photosensitive silver halide and a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms, and wherein the first aqueous dispersion has a pH at or above 8.0 and is obtained by a preparation process for a first aqueous dispersion comprising the steps of: separately preparing a second aqueous dispersion comprising said ex-situ photosensitive silver halide and a third aqueous dispersion comprising said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms; and mixing said second aqueous dispersion with said third aqueous dispersion to produce a mixture thereof, wherein said first aqueous dispersion thereby produced is substantially free of a water-soluble metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said second aqueous dispersion to a value of at least 8.0 prior to mixing with said third aqueous dispersion; increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to mixing with said second aqueous dispersion; and increasing the pH of said mixture to a value of at least 8.0.
- 16. A photothermographic recording material comprising a photo-addressable thermally developable element, wherein the photo-addressable thermally developable element comprises a layer produced with a fourth aqueous dispersion, wherein said fourth aqueous dispersion comprises a second in-situ photosensitive silver halide and a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and wherein the fourth aqueous dispersion has a pH at or above 8.0 and is obtained by a preparation process comprising the steps of: (i) providing a third aqueous dispersion comprising said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and (ii) partially converting said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms in said third aqueous dispersion with a non-fluoro halide ion source into said second in-situ photosensitive silver halide thereby producing said fourth aqueous dispersion; wherein said fourth aqueous dispersion thereby produced is substantially free of a water-soluble metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to step (ii); increasing the pH of the third aqueous dispersion to a value of at least 8.0 during step (ii); and increasing the pH of said aqueous dispersion resulting from step (ii) to a value of at least 8.0, wherein said process further includes a step of adding a water-soluble silver salt having a solubility in water at 20° C. of greater than 0.1 g/L at any stage in said preparation process.
- 17. A photothermographic recording material comprising a photo-addressable thermally developable element, wherein the photo-addressable thermally developable element comprises a layer produced with a first aqueous dispersion, wherein the first aqueous dispersion comprises an ex-situ photosensitive silver halide and a substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms, and wherein the first aqueous dispersion has a pH at or above 8.0 and is obtained by a preparation process for a first aqueous dispersion comprising the steps of: separately preparing a second aqueous dispersion comprising said ex-situ photosensitive silver halide and a third aqueous dispersion comprising said substantially light-insensitive silver salt of an aliphatic carboxylic acid with greater than 12 carbon atoms; and mixing said second aqueous dispersion with said third aqueous dispersion to produce a mixture thereof, wherein said first aqueous dispersion thereby produced is substantially free of a water-soluble metal or ammonium salt of an aliphatic carboxylic acid with greater than 12 carbon atoms and said process further comprises a step selected from the group consisting of: increasing the pH of said second aqueous dispersion to a value of at least 8.0 prior to mixing with said third aqueous dispersion; increasing the pH of said third aqueous dispersion to a value of at least 8.0 prior to mixing with said second aqueous dispersion; and increasing the pH of said mixture to a value of at least 8.0, wherein said process further includes a step of adding a water-soluble silver salt having a solubility in water at 20° C. of greater than 0.1 g/L at any stage in said preparation process.
Priority Claims (1)
Number |
Date |
Country |
Kind |
00203137 |
Sep 2000 |
EP |
|
Parent Case Info
The application claims the benefit of U.S. Provisional Application No. 60/244,348 filed Oct. 27, 2000.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4210717 |
Gatzke |
Jul 1980 |
A |
5891616 |
Gilliam et al. |
Apr 1999 |
A |
6391537 |
Lelental et al. |
May 2002 |
B2 |
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO 9704355 |
Feb 1997 |
WO |
Non-Patent Literature Citations (2)
Entry |
U.S. patent application Ser. No. 09/939,941, Uytterhoeven et al., filed Aug. 27, 2001. |
U.S. patent application Ser. No. 09/928,755, Uytterhoeven et al., filed Aug. 13, 2001. |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/244348 |
Oct 2000 |
US |