Aqueous-based photothermographic materials containing tetrafluoroborate salts
AssigneeEastman Kodak Company
InventorsSharon Simpson, Kumars Sakizadeh, Leif Olson
Life of this patent
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Abstract
Black-and-white, aqueous-based, silver halide-containing photothermographic materials have increased stability both prior to use and after imaging with the incorporation of at least 0.005 g/m2 of a tetrafluoroborate salt.
Claims21
A black-and-white aqueous-based photothermographic material comprising a support and having thereon at least one photothermographic imaging layer comprising a hydrophilic polymer binder or a water-dispersible polymer latex binder and in reactive association:
- a. a photosensitive silver halide,
- b. a non-photosensitive source of reducible silver ions,
- c. a reducing agent for said reducible silver ions, and
- d. at least 0.005 g/m2 of a tetrafluoroborate salt that is not a spectral sensitizing dye.
A black-and-white photothermographic material comprising a support having on a frontside thereof,
- a) one or more frontside photothermographic imaging layers comprising a hydrophilic polymer binder or a water-dispersible polymer latex binder, and in reactive association, a photosensitive silver halide, a non-photo-sensitive source of reducible silver ions, and a reducing agent for said non-photosensitive source reducible silver ions,
- b) said material comprising on the backside of said support, one or more backside photothermographic imaging layers having the same or different composition as said photothermographic imaging layers, and
- c) optionally, an outermost protective layer disposed over said one or more photothermographic imaging layers on either or both sides of said support,
- wherein said material further comprises, one or both sides of said support, at least 0.005 g/m2 of a tetrafluoroborate salt.
A black-and-white photothermographic material comprising a support and having thereon at least one photothermographic imaging layer comprising a gelatin or a gelatin derivative binder or a water-dispersible polymer latex binder and in reactive association:
- a. a photosensitive silver halide present predominantly as ultrathin tabular grains,
- b. a non-photosensitive source of reducible silver ions that is a silver benzotriazole, and
- c. a reducing agent for said reducible silver ions that is a fatty acid ester of ascorbic acid, and
- d. from about 0.01 to about 1 g/m2 of a tetrafluoroborate salt that is one of more of the following Compounds (1) to (12):
Dependencies are inferred from the claim text.