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US 4,742,162 AGranted
Azo-stibene condensates as leather dyes
AssigneeCiba-Geigy Corporation
InventorUlrich Schlesinger
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Abstract
Condensates of an azo compound of the formula ##STR1## wherein n is 1 or 2, with the stilbene compound of the formula ##STR2## in the molar ratio of 1:1 to 2:1, dye leather in a yellowish-brown shade, which penetrate deeply into the leather, and give fast dyeings.
Claims3
An azo-stilbene dye which is a condensate of an azo compound of the formula ##STR5## wherein n is 1 or 2, and the stilbene compound of the formula ##STR6## in the molar ratio of 1:1.
Dependencies are inferred from the claim text.