Back to results
US 7,468,241 B1Granted
Processing latitude stabilizers for photothermographic materials
AssigneeCarestream Health, Inc.
InventorsDoreen C. Lynch, William D. Ramsden, Sharon M. Simpson, Chaofeng Zou
Life of this patent
Estimating the term…
Abstract
Use of certain compounds in black-and-white photothermographic materials improves processing latitude particularly under conditions of high humidity.
Claims20
A black-and-white photothermographic material comprising a support having on at least one side thereof, one or more photothermographic emulsion layers comprising in reactive association:
- a. a photosensitive silver halide,
- b. a non-photosensitive source of reducible silver ions,
- c. a reducing agent composition for the reducible silver ions,
- d. a polymeric binder,
- e. one or more processing latitude stabilizers represented by Structures (I) or (II),
- wherein Ra represents a substituted or unsubstituted alkyl, cycloalkyl, alkenyl, cycloalkenyl, heterocyclic, aromatic, or heteroaromatic group,
- wherein Rb represents an aromatic carboxylate group whose corresponding acid has a pKa less than about 3,
- wherein Rc represents a substituted or unsubstituted alkyl, cycloalkyl, alkenyl, cycloalkenyl, heterocyclic, aromatic, or heteroaromatic group, and
- f. a substituted olefin c co-developer.
6 more elements
A black-and-white photothermographic material comprising a support having on at least one side thereof, one or more photothermographic emulsion layers comprising in reactive association:
- a. a photosensitive silver halide that is silver bromide or silver iodobromide that is present predominantly in cubic or tabular grains,
- b. a non-photosensitive source of reducible silver ions comprising at least silver behenate,
- c. a reducing agent is one or more of tris-phenol reducing agents represented by Structures (TP-1) or (TP-2) that is present in an amount of from about 1 to about 5 mmol/m2,
- d. a polymeric binder is a polyvinyl butyral or polyvinyl acetal, and
- e. one or more processing latitude stabilizers represented by Structures (I) or (II),
- wherein Ra represents a substituted or unsubstituted alkyl or cycloalkyl group of 1 to 10 carbon atoms, or a substituted or unsubstituted phenyl or naphthyl group,
- Rb represents 2,4-dichlorophenylcarboxyl, 1,3,5-trichlorophenylcarboxyl, or 2-chloro-4-nitrophenylcarboxyl group,
- Rc represents an alkoxy substituted phenyl or naphthyl group wherein the alkoxy group has 1 to 6 carbon atoms, and
- f. a substituted olefinic co-developer represented by the following Structure (IV):
- wherein V and W are independently aromatic groups or electron withdrawing groups, provided that at least one of V and W is an electron withdrawing group having a Hammett σp greater than 0.35, or V and W can represent the atoms necessary to form a ring containing such an electron withdrawing group, and R′ is hydroxyl, acyloxy, or, —O—A+, and
- wherein the total amount of silver is present in an amount of at least 1 g/m2 and less than or equal to 2.6 g/m2.
8 more elements
Dependencies are inferred from the claim text.