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US 5,397,690 AGranted
Near-infrared absorbing dyes prepared from stenhouse salts
AssigneeE. I. Du Pont de Nemours and Company
InventorsDietrich M. Fabricius, Thomas Schelhorn
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Abstract
An improved dye class and preparation procedure therefore is provided. The dyes can be prepared from a Stenhouse salt which is economical and can be prepared from readily available reagents. The improved dye is particularly suited for use as an antihalation dye in photographic elements and does not impart deleterious properties thereto. These and other properties are provided in a dye represented by: ##STR1## wherein the constituents have defined values.
Claims4
A photographic element comprising:
- a support;
- a silver halide layer coated on said support;
- an antihalation layer coated on said support wherein said antihalation layer comprises 0.005 to 0.05 g/M.sup.2 of an antihalation dye defined by;
- ##STR13## wherein Z.sub.1 and Z.sub.2 are independently chosen from 3,3-dimethylbenz(e)indole and 3,3-dialkylindolenine;
- R.sub.1 and R.sub.3 independently represent alkylsulfonate of 1 to 20 carbons or alkylcarboxylate of 1 to 20 carbons;
- R.sub.2 represents hydrogen, alkenyl of 2 to 20 carbons, aralkyl of 6 to 18 carbons, alkylsulfonate of 1 to 20 carbons, alkylcarboxylate of 1 to 20 carbons, acyl of 2 to 20 carbons;
- n is 0 to 3 as necessary to balance the charge;
- X is a counterion chosen from the set consisting of halide, p-toluenesulfonate, methanesulfonate, trifluoromethanesulfonate, acetate, sodium, potassium, calcium, magnesium, lithium, ammonium, and trialkylammonium.
5 more elements
A photographic element comprising:
- a support;
- a silver halide layer coated on said support;
- an antihalation layer coated on said support wherein said antihalation layer comprises 0.005 to 0.05 g/M.sup.2 of an antihalation dye chosen from the set consisting of:
- ##STR14##
1 more element
Dependencies are inferred from the claim text.