Stable, highly concentrated dyestuff solutions miscible with water in any proportion

摘要

Stable, highly concentrated dyestuff solutions which are miscible with water in any proportion are described and which contain at least one azo or nitro dyestuff containing sulphonic acid groups or at least one anthraquinone dyestuff dissolved in a solvent mixture consisting of an aprotic solvent or a mixture of aprotic solvents, a glycol ether and optionally water, e.g. N-methylpyrrolidone/diethylene glycol monomethyl ether which mixture exhibits a pronounced synergetic effect with regard both to the solubility of the dyestuffs and to the stability of the dyestuff solution. These dyestuff solutions are suitable for the production of dye solution for the dyeing or printing of in particular, natural or synthetic nitrogen containing organic fibers especially polyamide carpets.