Ciba-Geigy Corporation

Ciba Specialty Chemicals Corporation

Alex Nicopoulos

Gerhard Hanika

Hanspeter Birri

Peter Moser

Arnulf Ruediger Lapple

Pavel Haspra

The compounds of formula ##STR1## wherein the substituents are as defined in the claims, are suitable for dyeing or printing, inter alia, polyacrylonitrile and acid-modified polyester fibers, and can furthermore be converted by anion exchange into a physical form suitable for liquid formulations.

Oxazine dyes, their preparation and the use thereof

There is described a process for the preparation of highly concentrated aqueous solutions of specific cationic azo dyes. The solutions are prepared by diazotising a diazo component in a solution which contains sulfuric acid, coupling the diazotised component to a coupling component, treating the resultant azo dye with a bicarbonate, and converting the dye bicarbonate with an organic acid into the dye salt of said acid.

Process for the preparation of highly concentrated solutions of cationic

A process for the preparation of dyes of formula (1) as indicated in claim 1 or of mixtures of such dyes is described. The dyes of formula (1) are obtained by reacting 1,4-diaminoanthraquinone-2,3-dicarboximide, or the corresponding monoimino compound, with an amine and in the absence of a solvent. Dye mixtures are prepared by subsequently partially transamidating the resultant product.

Process for the preparation of anthraquinoid disperse dyes and mixtures

A novel liquid preparation containing a mixture of dyes according to claim 1, an aliphatic carboxylic acid, and optionally water and organic solvents. This novel preparation is storage-stable and temperature-stable and can be used in particular for dyeing polyacrylonitrile materials in black shades, the dyeings obtained having a neutral shade, negligible change of shade in artificial light and very good fastness to light.

Liquid preparation of cationic dye mixture containing aliphatic

A process for the preparation of basic oxazine dyes of the formula ##STR1## wherein R represents a low molecular alkoxy or alkyl group which is substituted or unsubstituted, R.sub.1 represents a low molecular alkyl group which is substituted or unsubstituted, R.sub.2 represents a low molecular alkyl group which is substituted or unsubstituted or an aryl radical, and each of R.sub.3 and R.sub.4 independently represents hydrogen or a low molecular alkyl radical which is substituted or unsubstituted, and R.sub.1 may be attached to R.sub.2 and R.sub.3 to R.sub.4 through a heteroatom, and wherein the ring a can carry further non-ionogenic substituents or a fused benzene ring, and X.sup.- represents an anion, which process comprises treating a compound of the formula ##STR2## wherein R.sub.1, R.sub.2 and a have the meanings previously assigned to them, with nitrous acid in a polar, water-miscible solvent and adding to the resultant nitrosation mixture, without isolating the nitroso compound, a diamine of the formula ##STR3## wherein R, R.sub.3 and R.sub.4 have the indicated meanings and each of R.sub.5 and R.sub.6 represents hydrogen or a low molecular alkyl group.

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Basel, Switzerland

Alex Nicopoulos