1:2-Cobalt-complex azo dyestuffs having an acetoacetylamino diphenylamino coupler

US4113719A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hermann Fuchs
• Klaus Filzinger · Hofheim, DE

Key dates

• Filing date: Feb 2, 1977
• Grant date: Sep 12, 1978
• Expiry date: Feb 2, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B45/20
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Novel, valuable 1:2-cobalt-complex dyestuffs of the monoazo compound of formula ##STR1## had been found, in which R.sub.1 is halogen, nitro, lower alkyl, a sulfonamide radical or a carbonamide radical, and R.sub.2 and R.sub.3 are alternatively a nitro and sulfo group. These novel dyestuffs are well suitable for the dyeing of natural and synthetic polyamide fibers, especially in admixture with hydrophobic fibers, and also especially advantageously with other 1:2-chromium or 1:2-cobalt-complex dyestuffs containing one or two sulfonic acid groups per dyestuff molecule, yielding even, strong dyeings of high fastnesses to wet processing and to use as well as to light. -- The novel cobalt complex dyestuffs can be prepared by cobalting the above monoazo compound (1) by means of a cobalt yielding agent.