Photothermographic material and method for making
AssigneeFuji Photo Film Co., Ltd.
InventorsKazunobu Katoh, Akira Hatakeyama
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Abstract
A photothermographic material exhibiting satisfactory photographic properties can be prepared using an aqueous dispersion of components. A photosensitive layer is formed by dispersing a binder and silver halide in an aqueous solvent containing at least 30 wt % of water to form an aqueous dispersion, coating the aqueous dispersion onto a support, and drying the coating. The binder is a polymer having an equilibrium moisture content of 0.1-2 wt % at 25° C. and RH 60% or a thermoplastic resin. The binder is preferably based on a styrene-butadiene copolymer. Fog is suppressed even when the material is stored in a humid atmosphere.
Claims22
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.
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.
Dependencies are inferred from the claim text.