Method of dyeing or printing textile fibre materials using reactive dyes
View Patent ↗A method of dyeing or printing textile fiber materials, which comprises bringing the fiber material into contact with (a) at least one reactive dye containing at least one anionic group, (b) at least one compound which reduces the ionic character of the anionic group, and (c) at least one nucleophilic compound, yields dyeings or prints having deep hues and very good fastness properties.
1. A method of dyeing or printing textile fibre materials, which comprises bringing the fibre material into contact with
(a) an anionic group containing reactive dye of formula
(b) at least one compound which reduces the ionic character of the anionic group which is an Mg 2(+) , Ca 2(+) , Sr 2(+) , Ba 2(+) , Mn 2(+) , Cu 2(+) , Zn 2(+) , Ni 2(+) , Cd 2(+) , Co 3(+) , Al 3(+) , Sn 2(+) or Cr 3(+) salt in the form of a chloride, sulfate, nitrate, acetate, formate, tartrate or lactate, and
(c) at least one nucleophilic compound of formula
H 2 N—B—NH 2 (11),
wherein B is a C 2 -C 12 alkylene radical which may be interrupted by 1, 2 or 3 —O— moieties and which is unsubstituted or substituted by hydroxy or by sulfato.
2. A method according to claim 1 , wherein treatment of the fibre material with the nucleophilic compound is carried out in a separate after-treatment bath at a temperature of from 30 to 100° C.
3. A method according to claim 1 , wherein the compound which reduces the ionic character of the anionic group is used in an amount of from 0.1 to 100% by weight, based on the weight of the substrate.
4. A method according to claim 1 , wherein the nucleophilic compound is used in an amount of from 0.001 to 2% by weight, based on the weight of the dye liquor or on the weight of the after-treatment bath.
5. A method according to claim 1 , wherein synthetic polyamide fibre material is dyed.
6. A method according to claim 2 , wherein treatment of the fibre material with the nucleophilic compound is carried out in a separate after-treatment bath at a temperature of from 50 to 80° C.
7. A method according to claim 3 , wherein the compound which reduces the ionic character of the anionic group is used in an amount of from 2 to 40% by weight, based on the weight of the substrate.