WATER-SOLUBLE DISAZO DYESTUFFS, A PROCESS FOR THEIR PREPARATION AND THEIR USE FOR DYEING HETIC AND NATURAL POLYAMIDES

摘要

New water-soluble disazodyestuffs of the formula in which R1 represents the methyl, ethyl, .beta.-hydroxyethyl or .beta.-cyanoethyl group and R2 stands for a phenyl radical, whereby the radical -OR1 stands in ring A in 2- or in 4- position to the azo group, and their salts had been found which are very well suitable for dyeing of synthetic and natural polyamides and yield dyeings on these fibres with good to very good wet fasteness and fastnesses to processing and to use. Furthermore they possess a very good dyeing behaviour.