Process for the single-bath dyeing of cellulose fibers or mixtures thereof with synthetic fibers with water-insoluble azo dyestuffs produced on the fiber by the exhaustion method

摘要

Process for the single-bath dyeing of cellulose fibers and their mixtures with synthetic fibers with water-insoluble azo dyestuffs produced on the fiber according to the exhaustion method, wherein an aqueous dyebath is allowed to act on the textile material, at room temperature or moderately elevated temperature, which liquor contains, in addition to alkaline substances, sodium nitrite and an anionic dispersing system, the solution or dispersion of at least one component capable of entering into azo coupling and at least one non-diazotized primary aromatic amine in a medium on the basis of a water-miscible organic solvent or solubilizer, and after absorption of the coupling component, the diazotization of the amine and the dyestuff formation by coupling is caused in that acid or acid salts are added to the dyeing bath at room temperature.