1:2 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 fiber 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 O(CH 2 ) n OR 2 or (CH 2 )nOR 2 ,
R 2 is H; linear C 1-4 alkyl; branched C 3-4 alkyl or —SO 3 H,
n is 1, 2, 3 or 4 and
K is a cation.
2. A 1:2 chromium complex dye of formula (I) according to claim 1 , wherein R 2 is H; CH 3 or CH 2 CH 3 and n is 2, 3 or 4.
3. 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):
in which R 1 is defined as in claim 1
with a 1:1 chromium complex compound of the formula (III):
4. An ink-jet ink comprising at least one 1:2 chromium complex dye according to claim 1 or its salt.
5. A process for dyeing a fiber material containing hydroxyl groups or containing nitrogen comprising the step of applying to the fiber material at least one compound according to formula (I), of claim 1 , or its salt.
6. A fiber material containing hydroxyl groups or containing nitrogen comprising at least one compound as defined in claim 1 , or its salt.
7. A salt of a 1:2 chromium complex dye as claimed in claim 1 .
8. A process for printing a fiber material containing hydroxyl groups or containing nitrogen comprising the step of applying to the fiber material at least one compound according to formula (I) of claim 1 , or its salt.