WATER-SOLUBLE 1/2 COBALT COMPLEX DYESTUFFS

摘要

Novel, valuable unsymmetrical 1:2-cobalt complex dyestuffs on an azo and an azomethine compound have been found which are well suitable 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 to 150.degree.C, or by first cobalting the azomethine compound and them reacting it with the equimolar amount of the metal free azo compound.