Infrared dye for silver halide-based photographic elements
OwnerPaul L. Zengerle, John W. Harder +2inventors
InventorsPaul L. Zengerle, John W. Harder, Steven P. Szatynski, Stephen P. Singer
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Abstract
A non-infrared sensitized low silver photographic element with a non-light sensitive layer, preferably an antihalation layer, containing a diphenylaminocyclopentene heptacyanine benzothiazolium infrared dye where the benzothiazolium groups have electron-withdrawing substituents on the phenyl ring and solubilzed alkyl groups on the nitrogen. The infrared dye can be present as a liquid-crystalline dispersion. This class of infrared dyes form J-aggregated species in a liquid-crystalline or a solid particle dispersion with high IR density and low visible absorbance.
Claims12
A non-infrared sensitized photographic element comprising a support;
- at least one light-sensitive silver halide emulsion layer, and a non-light sensitive layer containing an infrared dye according to Formula (I):
- wherein:
- R1 and R2 each independently represent substituents chosen such that the sum of the Hammett σpara and σmeta parameters of R1 and R2 in total is greater than 0.45;
- R3 is hydrogen or an alkyl group;
- R4 and R5 each independently represent substituents;
- n, m, o and p each independently represents an integer from 0-4 and at least one of n or m is at least 1;
- q and w each independently represents an integer from 1-4;
- Y1 and Y2 each independently represents an anionic carboxylic acid group, a sulfonic acid group or a N-sulfonylcarbamoyl group;
- and
- X is a counterion chosen so that the net charge of the entire molecule is zero.
-14. (canceled)
Dependencies are inferred from the claim text.