High-speed thermally developable imaging materials
AssigneeEastman Kodak Company
InventorsChaofeng Zou, Doreen C. Lynch
Life of this patent
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Abstract
High-speed aqueous-based black-and-white photothermographic materials are imageable in any suitable fashion using ultraviolet, visible, infrared, or X-radiation. They can have one or more thermally developable imaging layers on either or both sides of the support and can be imaged with or without a phosphor intensifying screen in an imaging assembly. The photothermographic emulsions and materials have a net Dmin less than 0.25, and require less than 1 erg/cm2 to achieve a density of 1.00 above net Dmin. The imaging layers include hydrophilic binders or water-dispersible latex polymer binders and chemically and spectrally sensitized photosensitive silver halide grains.
Claims29
An aqueous-based black-and-white photothermographic material comprising a support having on at least one side thereof, one or more imaging layers comprising the same or different hydrophilic binders or water-dispersible latex polymer binders, and in reactive association:
- a. a non-photosensitive source of reducible silver ions,
- b. a reducing agent composition for said reducible silver ions, and
- c. chemically and spectrally sensitized photosensitive silver halide grains,
- said photothermographic material having a net Dmin less than 0.25, and requiring less than 1 erg/cm2 to achieve a density of 1.00 above net Dmin.
An aqueous-based black-and-white photothermographic material comprising a support having on at least one side thereof, one or more imaging layers comprising the same or different hydrophilic binders or water-dispersible latex polymer binders, and in reactive association:
- a. a non-photosensitive source of reducible silver ions,
- b. a reducing agent composition for said reducible silver ions, and
- c. chemically and spectrally sensitized photosensitive silver iodide or silver bromoiodide grains,
- said photothermographic material having a net Dmin less than 0.25, and requiring less than 1 erg/cm2 to achieve a density of 1.00 above net Dmin.
An aqueous-based black-and-white photothermographic material comprising a support having on at least one side thereof, one or more imaging layers comprising the same or different hydrophilic binders or water-dispersible latex polymer binders, and in reactive association:
- a. a non-photosensitive source of reducible silver ions,
- b. a reducing agent composition for said reducible silver ions, and
- c. chemically sensitized photosensitive silver bromide, silver iodide, or silver bromoiodide tabular grains,
- said tabular grains having an average thickness of at least 0.02 μm and up to and including 0.10 μm, an equivalent circular diameter of at least 0.5 μm and up to and including 8 μm, and an aspect ratio of at least 5:1.
An aqueous-based black-and-white photothermographic material comprising a support having on both sides thereof, one or more of the same or different imaging layers comprising the same or different hydrophilic binders or water-dispersible latex polymer binders, and in reactive association:
- a. a non-photosensitive source of reducible silver ions that includes a silver benzotriazole,
- b. a reducing agent composition for said reducible silver ions that is an ester of ascorbic acid, and
- c. chemically and spectrally sensitized preformed photosensitive tabular silver bromoiodide grains,
- said photothermographic material having a net Dmin less than 0.25, and requiring less than 1 erg/cm2 to achieve a density of 1.00 above net Dmin.
An imaging assembly comprising:
- A) an aqueous-based black-and-white photothermographic material comprising a support having on at least one side thereof, one or more imaging layers comprising the same or different hydrophilic binders or water-dispersible latex polymer binders, and in reactive association:
- a. a non-photosensitive source of reducible silver ions,
- b. a reducing agent composition for said reducible silver ions, and
- c. chemically and spectrally sensitized photosensitive silver iodide or bromoiodide grains,
- said photothermographic material having a net Dmin less than 0.25, and requiring less than 1 erg/cm2 to achieve a density of 1.00 above net Dmin, and
- B) said photothermographic material being arranged in association with one or more phosphor intensifying screens.
Dependencies are inferred from the claim text.