LIQUID COMPOSITIONS OF FIBER-REACTIVE AZO DYES

摘要

of the disclosure: Concentrated dyeing compositions containing up to 45% by weight of one or more metal-free or metal complex azo dyestuffs containing one or more sulfo groups and one or more reactive groups, and containing buffer substances and having a pH of from 3 to 7, which may easily be prepared by diazotization and coupling of stiochiometrical amounts of a diazotizable amino compounds with a stoichiometrical amount of a nitrite and with the provise that at least the diazo or coupling component contain at least one free acid group, such as sulfo group; these compositions are salt-free or practically salt-free and are very well suitable for the preparation of usual dyeing liquors and printing pastes.