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AssigneeHoechst Aktiengesellschaft
InventorsKonrad Opitz, Josef Landler, Erhard Worfel
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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 stoichiometrical amounts of a diazotizable amino compounds with a stoichiometrical amount of a nitrite and with a coupling component without addition of an acid but with the proviso 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 useful in dyeing wool, silks, polyamide fibers and natural or regenerated cellulose.
A stable, liquid aqueous composition of fiber-reactive dye consisting essentially of 5 to 45% by weight of 1, 2, 3, or 4 dyestuffs which in the free acid form have the formula
Dependencies are inferred from the claim text.