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US 4,743,683 AGranted
Imidazole azo dyes
AssigneeCiba-Geigy Corporation
InventorPaul Tschopp
Life of this patent
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Abstract
A photographic recording material which contains at least one dye of the formula ##STR1## wherein D is the group of atoms necessary to complete a 5-membered ring that contains at least one nitrogen atom, A is hydrogen, alkyl, alkoxy, phenyl, alkylthio, cyano, nitro or halogen, n is 0 to 3, R.sub.1 is hydrogen, alkyl, hydroxyl, acylamino, R.sub.6 is hydrogen or unsubstituted or substituted amino, and R.sub.4 is hydrogen or alkoxy. The material is distinguished by good color reproduction, brilliant colors and excellent lightfastness.
Claims1
A compound of the formula ##STR59##
Dependencies are inferred from the claim text.