Claims
- 1. A method for preparing a photothermographic material comprising a support, a photosensitive layer disposed on at least one surface of the support and containing a photosensitive silver halide, and a non-photosensitive organic silver salt and a reducing agent therefor, wherein said non-photosensitive organic silver salt is a silver salt of a long chain aliphatic carboxylic acid having 10 to 30 carbon atoms,said method comprising the steps of: dispersing a primary binder and the silver halide in an aqueous solvent containing at least 30% by weight of water to form an aqueous dispersion, said primary binder being a polymer or a copolymer having an equilibrium moisture content of up to 2% by weight at 25° C. and RH 60%, coating the aqueous dispersion onto a support, and drying the coating to form the photosensitive layer.
- 2. The method of claim 1 wherein said aqueous solvent contains at least 70% by weight of water.
- 3. The method of claim 1 further comprising the step of adding said non-photosensitive silver salt to said aqueous dispersion.
- 4. The method of claim 1 further comprising the step of adding a water dispersion of said reducing agent to said aqueous dispersion.
- 5. The method of claim 1 further comprising the step of containing said reducing agent in a layer other than said photosensitive layer.
- 6. The method of claim 5 further comprising the steps ofcoating at least one non-photosensitive layer on the same surface of the support as said photosensitive layer, and concurrently drying said photosensitive layer and said non-photosensitive layer.
- 7. The method of claim 1 wherein said primary binder constitutes at least 50% by weight of an entire binder in the photosensitive layer.
- 8. The method of claim 1 wherein said polymer or copolymer has an equilibrium moisture content of 0.1 to 1.5% by weight at 25° C. and RH 60%.
- 9. The method of claim 8 wherein said polymer or copolymer has an equilibrium moisture content of 0.2 to 1% by weight at 25° C. and RH 60%.
- 10. The method of claim 1 wherein said polymer or copolymer is selected from the group consisting of a polyurethane, polyester, vinyl chloride resin, vinylidene chloride resin, rubbery resin, polyvinyl acetate, polyvinyl acetal, polyolefin, styrene-butadiene copolymer, acryl resin and a mixture thereof.
- 11. The method of claim 10 wherein said polymer contains at least 50% by weight of a styrene-butadiene copolymer.
- 12. A method for preparing a photothermographic material comprising a support, a photosensitive layer disposed on at least one surface of the support and containing a photosensitive silver halide, and a non-photosensitive organic silver salt and a reducing agent therefor, wherein said non-photosensitive organic silver salt is a silver salt of a long chain aliphatic carboxylic acid having 10 to 30 carbon atoms,said method comprising the steps of: dispersing a primary binder and the silver halide in an aqueous solvent containing at least 30% by weight of water to form an aqueous dispersion, said primary binder being a polymer or copolymer having an equilibrium moisture content of up to 2% by weight at 25° C. and RH 60%, coating the aqueous dispersion onto a support to form a photosensitive layer coating which is to form the photosensitive layer after drying, coating at least one non-photosensitive layer on the same surface of the support as said photosensitive layer, and concurrently drying said photosensitive layer and said non-photosensitive layer.
- 13. The method of claim 12 wherein said aqueous solvent contains at least 70% by weight of water.
- 14. The method of claim 12 further comprising the step of adding said non-photosensitive silver salt to said aqueous dispersion.
- 15. The method of claim 12 further comprising the step of adding a water dispersion of said reducing agent to said aqueous dispersion.
- 16. The method of claim 12 further comprising the step of containing said reducing agent in a layer other than said photosensitive layer.
- 17. The method of claim 12 wherein said primary binder constitutes at least 50% by weight of an entire binder in the photosensitive layer.
- 18. The method of claim 12 wherein said polymer or copolymer has an equilibrium moisture content of 0.1 to 15% by weight at 25° C. and RH 60%.
- 19. The method of claim 18 wherein said polymer or copolymer has an equilibrium moisture content of 0.2 to 1% by weight at 25° C. and RH 60%.
- 20. The method of claim 12 wherein said polymer or copolymer is selected from the group consisting of a polyurethane, polyester, vinyl chloride resin, vinylidene chloride resin, rubbery resin, polyvinyl acetate, polyvinyl acetal, polyolefin, styrene-butadiene copolymer, acryl resin and a mixture thereof.
- 21. The method of claim 20 wherein said polymer or copolymer contains at least 50% by weight of a styrene-butadiene copolymer.
- 22. The method of claim 1, wherein said binder is a polymer or copolymer latex.
Priority Claims (4)
Number |
Date |
Country |
Kind |
8-130841 |
Apr 1996 |
JP |
|
8-234732 |
Aug 1996 |
JP |
|
8-316986 |
Nov 1996 |
JP |
|
8-355977 |
Dec 1996 |
JP |
|
Parent Case Info
This is a division of application Ser. No. 08/843,714, filed Apr. 17, 1997, now U.S. Pat. No. 6,140,037.
US Referenced Citations (11)
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EP |
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EP |
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EP |
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GB |
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JP |
WO9704355 |
Feb 1997 |
WO |
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WO |
Non-Patent Literature Citations (3)
Entry |
The Condensed Chemical Dictionary, Tenth Edition, Revised by Gessner G. Hawley, p. 1016 (1981). |
Takaaki Sugimura et al., “Application of Synthetic High Polymer”, published by Koubunshi Kankoukai, Jul. 1993, pp. 86-87. |
Souichi Muroi, “High Polymer Latex Adhesive”, published by Koubunshi Kankoukai, Jun. 1984, p. 77. |