Dye composition for dyeing fibres based on mixture of at least three N-ethyl-N-substituted 4-(2-halo-4-nitro-6-halo/nitrophenyl)azoaniline derivatives

摘要

Dye compositions for dyeing fibres, particularly polyester fibres and their blends, comprise (a) from 20 to 40% of at least one azo dye of structure (I); (b) from 20 to 40% of at least one azo dye of structure (II); and (c) from 10 to 50% of a dye of structure (III), the percentages being by weight of total dye in the composition. Preferably, Hal is bromine in both (I) and (II), and the composition contains an overall dye content of 40% and 60% by weight of lignin sulphonate dispersant. Such compositions provide strong, economical black shades of pleasing tone, especially when combined with an orange or red azo dye, such as one of formula (IV). Methods of mixing such dye compositions (by mixing the component dyes and by co-coupling the precursors of compounds of formulae (I) and (II)), and methods of dyeing fibres with the dye compositions, are also described.