CS215760B1 - Blue 152 chromocomplex azo dye - Google Patents

Abstract

152 The chromium complex of a naphthol o,6-dihydroxyazo dye, asymmetrically substituted with one sulfo group (see formula), expands the palette of dyes for dyeing wool and polyamide with a blue shade, outstanding for its excellent elongation, uniformity and fastness of dyeing.

Description

The invention relates to a novel 1s2 ehromocomplex azo dye for dyeing wool and polyamide.

For dyeing wool and polyamide from weakly acid to neutral baths, so-called 1 s2 metal-complex azo dyes are used when dyeing is required to have high dry and wet fastnesses. They are the coordination complexes of one metal atom with the coordination number 6 (most often of the tremor or cobalt) with two identical or different ο, ω-dihydroxy-, o-hydroxy-δ-carboxy- or o-hydroxy-δ-aminoazo dyes. The water-solubility of these 1s2 metal-complex dyes - if they do not carry any lyophilic substituents - is very low and for practical application to textile material from an aqueous environment it is necessary to convert them beforehand to fine form by dispersion milling.

Another way of treating them for use in practical dyeing is to increase solubility by appropriate substitution. 1s2 metal-complex dyes solubilized by non-ingenic hydrophilicity-increasing substituents such as sulfamoyl or methanesulfonyl groups are known. However, the production of these dyes is relatively expensive. The same dyeing qualities and even better results have been achieved in some cases with sulfosubstituted dyes. However, the incorporation of sulfo groups into the 1s2 molecule of the metal-complex dye is not without problems. While the non-inogenously substituted 1: 2 complexes are essentially monovalent acid salts, substitution with sulfo groups increases the negative charge of the color anion and, of course, can adversely affect its dyeing properties, namely, dyeing as well as ductility. The dyeing behavior is influenced not only by the electric charge, but also by the substitution topography and the spatial arrangement of the colored complex molecule.

It has now been discovered that the wool and polyamide are colored with a blue shade of 1 s2 by the chromoconjugate azo dye of the invention, of the formula

The dye according to the invention is characterized by high solubility and dyeing power. It has very good migration properties, which is manifested by excellent flatness of coloring. It can be well combined with other dyes of the same or other metal-complex assortments, possibly with common acid dyes.

Example

50.7 g (0.1 mol) of chromium 1sl monoazo dye complex 1-diazo-2-naphthol-4-sulfoacid -> 2-naphthol paste is introduced into a 70 ° C warm soda alkaline coupling sus2

215 760 monoazo dyes pension 4-chloro-2-aminophenol → 2-naphthol. After a few hours of heating at 85-90 ° C, a deep blue solution of a 1: 2 mixed reddish complex of reddish blue was formed. Evaporation gave 110 g of a strong dye which stains wool and FAD with a reddish blue hue.

Claims (1)

Blue 1: 2 chromocomplex azo dye formula ÍQ