Black-and-white thermographic material containing dye-forming chemistry
AssigneeEastman Kodak Company
InventorsJoe Maskasky, Victor Scaccia
Life of this patent
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Abstract
Direct thermographic materials are designed to have image tone with near neutral density. Besides a non-photosensitive source of reducible silver ions, the materials also include a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C., and a combination of cyan and magenta dye-forming color couplers that provide cyan and magenta dyes. No black-and-white developers are purposely added to these materials. This combination of components provides a means for controlling image tone without reliance solely upon conventional toning agents that provide imaging toning only.
Claims23
A black-and-white thermographic material comprising a support having thereon at least one imaging layer comprising a binder and imaging chemistry that consists essentially of:
- a) a non-photosensitive source of reducible silver ions,
- b) a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C.,
- c) a cyan dye-forming color coupler that is capable of reacting with said released color developing agent to produce a cyan dye, and
- d) a magenta dye-forming color coupler that is capable of reacting with said released color developing agent to produce a magenta dye,
- wherein said released color developing agent is further capable of reducing said reducible silver ions.
A black-and-white, non-photosensitive thermographic material that comprises a transparent polymer support having on only one side thereof one or more thermally sensitive imaging layers and an outermost non-thermally sensitive protective layer over said one or more thermally sensitive imaging layers,
- said one or more thermally sensitive imaging layers comprising one or more hydrophilic binders, and in reactive association, imaging chemistry consisting essentially of:
- a) a non-photosensitive source of reducible silver ions that includes one or more silver aliphatic carboxylates at least one of which is silver behenate,
- b) a color developing agent precursor that releases a p-phenylenediamine color developing agent when heated to a temperature of at least 80° C.,
- c) a development enhancing toning agent,
- d) a cyan dye-forming color coupler that is capable of reacting with said released color developing agent to produce a cyan dye, and
- e) a magenta dye-forming color coupler that is capable of reacting with said released color developing agent to produce a magenta dye,
- said cyan dye-forming color coupler and magenta dye-forming color coupler being independently present in an amount from 0.1 to 1 mole per mole of reducible silver ions, and the amount of silver is at least 0.001 mol/m2, and wherein said released color developing agent is further capable of reducing said reducible silver ions and said material is substantially free of black-and-white developing agents that are capable of solely reducing said reducible silver ions and substantially free of phthalazinone and phthalazinone derivatives.
Dependencies are inferred from the claim text.