Patent ID: 7396370

Claim:
A method of dyeing or printing synthetic polyamide fibre materials, wherein (a) the fibre material is dyed or printed with at least one reactive dye, and (b) the dyed or printed fibre material is subjected to after-treatment with a reducing agent, the fibre material not being treated with polycondensable or polymerisable compounds for fixing the dye on the fibre, and wherein blend fibres of polyester and polyamide are excluded, and wherein the at least one reactive dye is a reactive dye of formula wherein R 1 is hydrogen or unsubstituted or substituted C 1 -C 4 alkyl, X is halogen, A is the radical of a monoazo, disazo, polyazo, metal complex azo, anthraquinone, phthalocyanine, formazan or dioxazine dye, and V is a non-fibre-reactive substituent or is a fibre-reactive substituent of formula wherein R 2 is hydrogen or unsubstituted or substituted C 1 -C 4 alkyl or a radical wherein R 3 is as defined below, R 3 is hydrogen, hydroxy, sulfo, sulfato, carboxy, cyano, halogen, C 1 -C 4 alkoxycarbonyl, C 1 -C 4 alkanoyloxy, carbamoyl or a group —SO 2 —Y, R 4 is hydrogen or C 1 -C 4 alkyl, alk and alk 1 are each independently of the other linear or branched C 1 -C 6 alkylene, arylene is a phenylene or naphthylene radical which is unsubstituted or substituted by sulfo, carboxy, hydroxy, C 1 -C 4 alkyl, C 1 -C 4 alkoxy or by halogen, Y is vinyl or a radical —-CH 2 —CH 2 -U and U is a leaving group, Y 1 is a group —CH(Hal)-CH 2 (Hal) or —C(Hal)=CH 2 wherein Hal is chlorine or bromine, W is a group —SO 2 —NR 4 —, —CONR 4 — or —NR 4 CO— wherein R 4 is as defined above, Q is a radical —O— or —NR 4 — wherein R 4 is as defined above, and n is a number 0 or 1.