Water-soluble 1:2-cobalt complex dyestuffs of an azomethine and of an azo compound

US4145339A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hermann Fuchs
• Klaus Filzinger · Hofheim, DE

Key dates

• Filing date: Dec 13, 1977
• Grant date: Mar 20, 1979
• Expiry date: Dec 13, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B45/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Novel, valuable unsymmetrical 1:2-cobalt complex dyestuffs of an azo compound and an azomethine compound have been found which are well suited for the dyeing of natural and synthetic polyamide fibres, yielding even dyeings of high fastnesses to wet processing and use as well as to light. The novel dyestuffs can be prepared either by cobalting the equimolar mixture of the metalfree azo and azomethine dyestuffs with a cobalt-yielding compound at a pH of 5 to 10 at 60 .degree. to 150.degree. C., or by first cobalting the azomethine compound and then reacting it with the equimolar amount of the metalfree azo compound. The compounds are 1:2-cobalt complex compounds of the compounds ##STR1## in which R.sub.1 is chlorine, lower alkyl or nitro, R.sub.2 is hydrogen, lower alkyl or lower alkoxy, R.sub.3 is hydrogen, chlorine, nitro or lower alkyl, Z is ##STR2## in which R.sub.4 is hydrogen, lower alkyl or lowr alkoxy, R.sub.5 is hydrogen, lower alkyl or lower alkoxy, X is hydroxy, sulfoalkyl of from 1 to 4 carbon atoms, or ##STR3## R.sub.9 is hydrogen or lower alkyl, and R.sub.6 and R.sub.7 are different from each other and each is nitro or sulfo.