Photothermographic imaging materials and sensitisers therefor
AssigneeMinnesota Mining and Manufacturing Company
InventorsRonald W. Burrows, David B. Oliff, James B. Philip, Jr.
Life of this patent
Estimating the term…
Abstract
A heptamethine cyanine dye in which both nitrogen atoms of the cyanine chromophore bear a carboxyalkyl substituent comprising an alkyl chain of at least five carbon atoms. The dyes are useful as sensitisers in photothermographic imaging materials.
Claims12
A photothermographic element having a photosensitive medium comprising silver halide, a reducible silver source and a reducing agent for silver ion, characterised in that the medium includes as a sensitising dye a heptamethine cyanine dye characterised in that both nitrogen atoms of the cyanine chromophore bear a carboxyalkyl substituent comprising an alkyl chain of at least five carbon atoms.
Dependencies are inferred from the claim text.