Base precursors for use in a photothermographic element
AssigneeEastman Kodak Company
InventorsRamanuj Goswami, David H. Levy
Life of this patent
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Abstract
Improved compounds and base precursors that undergo thermal decomposition are disclosed. Thermal-dye-bleach agents, and in particular, a novel class of salts of arylsulfonylacetic acids as bleaching agents for photothermographic use are disclosed. Photothermographic elements employing these thermal-dye-bleach agents are suitable for use as acutance and antihalation systems, bleachable filter dye materials, and in promoting unblocking of various components such as blocked developers, especially in in photothermographic elements.
Claims8
A composition comprising a base precursor that is the salt of an organic base with an arylsulfonylacetic acid having the following structure:
- wherein the group Z individually represents the non-metallic atoms necessary to complete a substituted or unsubstituted ring system containing at least one 5- or 6-membered imide nucleus or a 5- or 6-membered imide nucleus that can be fused with additional substituted or unsubstituted rings;
- wherein each of R2 and R3 is a monovalent group selected from the group consisting of hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group and a heterocyclic group, wherein each of the monovalent groups may have one or more substituent groups;
- said base precursor being further in thermal processing association with a photographically useful compound selected from the group consisting of filter dyes, blocked photograhically useful groups, couplers, developing agents, and electron transfer agents.
A composition comprising a base precursor that is the salt of an organic base with an arylsulfonylacetic acid having the following structure:
- wherein each of R2 and R3 is a monovalent group selected from the group consisting of hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group and a heterocyclic group, wherein each of the monovalent groups may have one or more substituent group;
- said base precursor being further in heat-bleach association with a filter dye.
Dependencies are inferred from the claim text.