Method of dyeing or printing synthetic polyamide fibre materials using reactive dyes

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
• R1 is hydrogen or unsubstituted or substituted C1-C4 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
• R2 is hydrogen or unsubstituted or substituted C1-C4 alkyl or a radical
• wherein R3 is as defined below,
• R3 is hydrogen, hydroxy, sulfo, sulfato, carboxy, cyano, halogen, C1-C4 alkoxycarbonyl, C1-C4 alkanoyloxy, carbamoyl or a group —SO2—Y,
• R4 is hydrogen or C1-C4 alkyl,
• alk and alk1 are each independently of the other linear or branched C1-C6 alkylene,
• arylene is a phenylene or naphthylene radical which is unsubstituted or substituted by sulfo, carboxy, hydroxy, C1-C4 alkyl, C1-C4 alkoxy or by halogen,
• Y is vinyl or a radical —-CH2—CH2-U and U is a leaving group,
• Y1 is a group —CH(Hal)-CH2(Hal) or —C(Hal)=CH2 wherein Hal is chlorine or bromine,
• W is a group —SO2—NR4—, —CONR4— or —NR4CO— wherein R4 is as defined above,
• Q is a radical —O— or —NR4— wherein R4 is as defined above, and
• n is a number 0 or 1.