Chromium complex dyes
View Patent ↗The present invention relates to novel 1:2 chromium complex dyes, processes for their preparation and their use for dyeing or printing fibre materials containing hydroxyl groups or containing nitrogen. The present invention relates to a 1:2 chromium complex dye of formula (I) wherein all substituents are as defined in the claims, a process for their preparation and their use for dyeing or printing fiber materials containing hydroxyl groups or containing nitrogen.
1. A 1:2 chromium complex dye of formula (I)
wherein
R 1 is H, Cl, Br or NO 2 ,
R 2 is H, Cl, Br, —NO 2 , —SO 2 NH 2 or —SO 3 H
R 3 is O(CH 2 ) n OR 4 or (CH 2 ) n OR 4 ,
R 4 is H; linear C 1-4 alkyl; branched C 3-4 alkyl or —SO 3 H,
n is 1, 2, 3 or 4 and
Ka + is a cation
as well as mixtures thereof and/or salts thereof.
2. A 1:2 chromium complex dye of formula (I) according to claim 1 , wherein R 3 is in the para position relative to the nitrogen atom and R 4 is H; CH 3 or CH 2 CH 3 and n is 2, 3 or 4, as well as mixtures thereof and/or salts thereof.
3. A 1:2 chromium complex dye of formula (I) according to claim 1 , wherein R 1 is H or NO 2 and R 2 is NO 2 or SO 2 NH 2 .
4. A process for the production of compounds of formula (I) according to claim 1 comprising the step of reacting an azo compound of the formula (II)
with a 1:1 chromium complex compound of the formula (III)
wherein R 1 , R 2 , R 3 and R 4 are defined above.
5. An ink-jet ink comprising at least one dyestuff according to claim 1 .
6. A process for dyeing or printing a fiber material containing hydroxyl groups or nitrogen groups comprising the step of contacting the fiber material with at least one dyestuff according to formula (I), its salts or mixtures thereof.
7. A fiber material containing hydroxyl groups or nitrogen groups dyed or printed with at least one compound as defined in claim 1 its salts or mixtures thereof.
8. A process for the preparation of an ink-jet ink comprising the step of mixing at least one dyestuff according to claim 1 with at least one additional ink-jet ink formulation compound.