1.3-thiazolyl azo dyes, their preparation and use
View Patent ↗A disperse dye of formula (I): Wherein R 1 and R 2 independently are each (C 1 -C 4 )-alkyl, OH or (C 1 -C 4 )-alkoxy-substituted (C 1 -C 4 )-alkyl; R 3 and R 4 independently are each hydrogen or methyl; one of A and B is cyano and the other is —COOX; and X is (C 2 -C 12 )-alkyl, O-interrupted (C 2 -C 12 )-alkyl, (C 3 -C 4 )-alkenyl or phenyl-(C 1 -C 4 )-alkyl. The invention also relates to the preparation of the dye and the use of the dye.
1. A disperse dye of formula I
wherein
R 1 and R 2 independently are each (C 1 -C 4 )-alkyl or OH or (C 1 -C 4 )-alkoxy-substituted (C 1 -C 4 )-alkyl;
R 3 and R 4 independently are each hydrogen or methyl;
one of A and B is cyano and the other is —COOX; and
X is (C 2 -C 12 )-alkyl, O-interrupted (C 2 -C 12 )-alkyl, (C 3 -C 4 )-alkenyl or phenyl-(C 1 -C 4 )-alkyl.
2. The disperse dye as claimed in claim 1 conforming to formula (Ia)
3. The disperse dye as claimed in claim 1 conforming to formula (Ic)
4. The disperse dye as claimed in claim 1 wherein X is ethyl, n-propyl, n-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-octyl, methoxyethyl, ethoxyethyl, i-propoxyethyl, n-butoxyethyl, allyl or benzyl.
5. A process for preparing a disperse dye of the formula (I) as claimed in claim 1 , which comprises condensing a compound of the formula (II)
where R 1 to R 4 are each as defined in claim 1 , with an alkyl cyanoacetate of formula (III)
where X is as defined in claim 1 .
6. A process for dyeing and printing a hydrophobic material which comprises contacting the dye as claimed in claim 1 with the material.
7. An ink for digital textile printing by the ink jet process, comprising the disperse dye of the formula (I) as claimed in claim 1 .