Photothermographic elements containing a combination of spectral sensitizers
AssigneeEastman Kodak Company
InventorHeidi E. Dankosh
Life of this patent
Estimating the term…
Abstract
Improved photothermographic elements are spectrally sensitized with a combination of cyanine dyes that provides efficient sensitization together with excellent keeping stability and low dye stain. The photothermographic elements comprise a photosensitive silver halide, an organic silver salt, such as silver behenate, and a reducing agent. The dye combination utilized as a spectral sensitizer for the silver halide is a combination of a first cyanine dye containing two thiazole nuclei and a second cyanine dye containing a thiazole nucleus and an oxazole nucleus.
Claims20
A photothermographic element comprised of a support bearing one or more layers comprising:
- (a) a photosensitive silver halide, prepared in situ or ex situ,
- (b) an organic silver salt;
- and
- (c) a reducing agent;
- in concentrations such that imagewise exposure to actinic radiation generates from the silver halide a catalyst which accelerates an image-forming reaction between the organic silver salt and the reducing agent;
- wherein the photosensitive silver halide is spectrally sensitized with a combination of a first cyanine dye containing two thiazole nuclei and a second cyanine dye containing a thiazole nucleus and an oxazole nucleus.
Dependencies are inferred from the claim text.