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US 5,264,560 AGranted
Preparation of quaternized azo dyes
AssigneeBASF SE
InventorsGuenter Hansen, Johannes P. Dix, Helmut Reichelt, Clemens Grund
Life of this patent
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Abstract
Quaternized azo dyes whose diazo components are derived from a five-membered nitrogen-containing aromatic aminoheterocycle and whose coupling components are derived from the aniline series are prepared by reacting to corresponding neutral dye-bases with an alkylating agent in .gamma.-butyrolactone as inert diluent.
Claims2
A process for preparing a quaternized azo dye of the formula I ##STR10## where An.sup..crclbar. is one equivalent of an anion,
- L is C.sub.1 -C.sub.4 -alkyl,
- Het is a five-membered aromatic heterocycle which may be benzofused and contains at least one nitrogen atom and 1 or 2 further hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur and to which the radical L is attached at a nitrogen atom, and
- K is the radical of a coupling component of the aniline series, by reacting the neutral dyebase of formula II
- Het--N.dbd.N--K (II)
- where Het and K are each as defined above, with an alkylating agent of the formula III
- L--X (III)
- where L is as defined above and X is a leaving group, in .gamma.-butyrolactone as inert diluent.
4 more elements
Dependencies are inferred from the claim text.