Exhaust process for the dyeing of synthetic fibre materials

Claim 1

A process for dyeing synthetic fiber material by exhaustion comprising introducing synthetic fiber material into a dyebath which is a dispersion consisting essentially of A. organic solvent; B. nitro dyestuff containing 1 to 3 sulfonamide groups and largely insoluble in said dyebath; and C. up to 1% by weight of said organic solvent of water; said organic solvent consisting of water immiscible aliphatic halogenated hydrocarbon; and dyeing at a temperature of 60° to 170° C for 10-60 minutes until the dyebath is exhausted; said nitro dyestuff free of reactive groups, acid groups and carboxamide groups having the formula ##STR158## in which R 1 means hydrogen, a halogen atom, a trifluoro, cyano, hydroxy, C 1 -C 4 -alkyl or -alkoxy, a hydromethyl or -ethyl, a hydroxy-ethylene-oxy, acylamino, alkylsulphonylamino, alkylsulphone, carboxamido, aminosulphonylalkylene-amino or sulphonamide group; R 2 means hydrogen or a C 1 -C 4 -alkoxy group; R 3 means hydrogen, a halogen atom, a hydroxy, hydroxyethylene-oxy, carboxamido, aminosulphonyl-alkylene-oxy or sulphonamide group; X stands for the group --SO 2 -- or --CO; and Y stands for --NH-- or --O--, with the proviso that one of the radicals R 1 , R 3 or ##STR159## is a sulphonamide group or a radical containing a sulphonamide group.