Disperse azo dyes
The present invention relates to disperse azo dyes based on diazo components having at least one fluorine-containing substituent and an 2,6-diaminosubstituted pyridine coupling component, to a process for the preparation of such dyes and to their use in the dyeing or printing of semi-synthetic and, especially, synthetic hydrophobic fiber materials, more especially textile materials.
1. A dye of formula
wherein R 1 is trifluoromethyl,
R 2 denotes nitro,
R 3 represents hydrogen,
R 4 is phenyl and
R 5 is hydrogen.
2. A process for the preparation of an azo dye of formula (1) according to claim 1 , wherein a compound of formula
wherein R 1 , R 2 and R 3 are as defined in claim 1 ,
is diazotised and then coupled to a coupling component of formula
wherein R 4 and R 5 are as defined in claim 1 .
3. A dye mixture comprising a dye of formula (1a) according to claim 1 and a dye of formula (1b)
wherein R 1 is trifluoromethyl,
R 2 denotes nitro,
R 3 represents hydrogen,
R 4 is hydrogen and
R 5 is phenyl.
4. A process for the dyeing or printing of a semi-synthetic or synthetic hydrophobic fibre material, wherein a dye of formula (1a) according to claim 1 is applied to the said material or is incorporated into that material.
5. A process for the dyeing or printing of a sung-synthetic or synthetic hydrophobic fibre material, wherein a dye mixture according to claim 3 is applied to the said material or is incorporated into that material.