Patent ID: 8556995

Claim:
A process for dyeing blends of elastane and natural or synthetic polyamide or cellulose fibres which comprises treating said fibres with an aqueous liquor consisting of (a) a betaine of formula wherein R 1 is a monovalent radical of an aliphatic C 4 -C 30 hydrocarbon, R 2 and R 3 independently of one another represent C 1 -C 12 alkyl and X and Y independently of one another denote a bivalent radical of an aliphatic C 1 -C 12 hydrocarbon, (b) a quaternary ammonium salt of formula (2) wherein R 4 is a monovalent radical of an aliphatic C 4 -C 30 hydrocarbon, R 5 , R 6 and R 7 independently of one another represent C 1 -C 12 alkyl, C 5 -C 24 aryl or C 6 -C 30 aralkyl, A − is halogenide, nitrate, hydrogensulfate or sulfonate, and (c) an alkoxylated fatty alcohol, and (d) at least one dye and optionally one or more additives selected from a alkali, lubricant, electrolyte, antifoam, flame retardant, dirt-repellent, water-repellent, oil-repellent, alginate and water, and wherein the process is carried out in accordance with a padding or exhaust process.