Photothermographic materials incorporating antifoggants
AssigneeCarestream Health, Inc.
InventorsKui Chen-Ho, William D. Ramsden
Life of this patent
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Abstract
Incorporation of certain compounds into photothermographic materials provides materials with reduced initial image Dmin and improved Raw Stock Keeping film stability without unacceptable loss in sensitometric properties. These compounds include certain e-i) zinc salts of an aryl sulfonic acid or of a fluorinated C2-C6 carboxylic acid, e-ii) non-encapsulated alkali metal salts of an aryl sulfonic acid or of a fluorinated C2-C6 carboxylic acid, and e-iii) fluorinated C2-C6 carboxylic acids.
Claims18
A black-and-white photothermographic material comprising a support and having on at least one side thereof a photothermographic emulsion layer and comprising, 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,
- d. a non-hydrophilic binder, and
- e. one or more compounds from one or more of the following compound groups e-i), e-ii), and e-iii) that are present in a total amount of at least 5×10−6 mol/m2:
- e-i) zinc salts of aryl sulfonic acids or of a fluorinated C2-C6 carboxylic acids,
- e-ii) non-encapsulated alkali metal salts of aryl sulfonic acids or of fluorinated C2-C6 carboxylic acids, with the exclusion of sodium benzenesulfonate and sodium triisopropylnaphthalenesulfonate, or
- e-iii) fluorinated C2-C6 carboxylic acids,
- provided that said photothermographic material contains no compounds with a cyclic acid anhydride group and no non-polymeric compounds with acetal groups.
Dependencies are inferred from the claim text.