1:2 cobalt complex disazo dyestuffs, process for their preparation and their use for the dyeing of natural and synthetic fibres

Abstract From the Canadian patent

Novel, valuable 1:2-cobalt complex dyestuffs of the disazo compound of formula (1), (1), had been found in which R1 is hydrogen, halogen, nitro lower alkyl or lower alkoxy, R2 is hydrogen lower alkyl or, lower alkoxy, R3 is hydrogen lower alkyl or lower alkoxy, X is hydroxy or .beta.-sulfoethyl or a group of the formula wherein R4 is hydrogen or lower alkyl. The novel dyestuffs are well suitable for the dyeing of natural and synthetic polyamide fibres, especially in admixture with hydrophobic fibres, and also especially advantageously with other 1:2chromium or 1:2 cobalt complex dyestuffs containing one or two sulfonic cold groups per dyestuff molecule and yield even, strong dyeings o; high …