CS268368B1 - Orange 1 to 2 chromocomplex azo-dye - Google Patents

Abstract

Disodium chromium disulphide the complex of formula I is orange 1: 2 chromocomplex azobervivo which colors the e PAD wave from neutral or weak acidic environment excellent gravity, equality e at the same time high color fastness and high of the solubility that it allows use modern dyeing and printing processes.

Description

The present invention relates to an orange 1: 2 chromocomplex ezo dye for dyeing wool and polyamide.

For dyeing wool and polyamide from weakly acidic to neutral baths, so-called 1: 2 metal complex ezo dyes are used - if the dyeing is required to have high wet and dry fastnesses. ’.

The water distribution of 1: 2 metal complex azo dyes provides it with suitable lyophilic substituents. In conventional 1: 2 metal complex azo dyes, the solubility is ensured by the presence of nonionic substituents on the aromatic nucleus of the ezo dye, e.g. by a sulfamoyl or methylsulfamoyl group. However, the production of these dyes is relatively expensive.

The same dyeing qualities, and in the achievement of rich shades even better results, have been achieved in some cases by means of dyes solubilized by sulfo groups. However, the incorporation of a sulfo group into a 1: 2 molecule of a metal complex ezo dye is not without problems. While nonionically substituted 1: 2 metal complexes are essentially salts of monobasic acids, substitution of sulfo groups increases the negative charge of the colored anion and thus adversely affects its dyeing properties. However, by suitable placement of the sulfo group in the dye molecule and the distribution of the charge in its molecule, this negative effect can be suppressed. ·

1: 2 metal complex ezo dyes with one sulpho group in a molecule based on sulfophenylmethylpyrazolone are known from German Pat. No. 2,501,449. The disadvantage of these dyes is the high raw material intensity. The active component of the unsulfonated dye must, in addition to any further substituents, always carry a nitro group in position 5 or 6, while substitution of the active component of the sulfonated eso dye in position 5 is inadmissible. For dye manufacturers, these dyes mean an expansion of the range of production of nitrated aminophenols with all the negative technical and especially ecological consequences or a substantial increase in the cost of purchasing them. .

It has now been found that these disadvantages are eliminated by orange 1: 2 chromocomplex azo dyes according to the invention, of the general formula

The advantages of the dye according to the invention lie in its excellent elongation, equality, high color fastness and in particular its very high cold solubility, which allows the use of modern dyeing processes. reducing technical, but especially environmental, impacts *

Example: ·

59.1 g (0.1 mol) of a chromium-plated 1: 1 complex of the prepared chromac monoazo dye

CS 268 368 81 2

4-Nitro-2-aminophenol-N 1 (2,5'-dichloro-4'-sulfophenyl) -3-methyl-5-pyrazolone chromium chloride, is added in the form of a filter cake to 1000 ml of sodium-alkaline coupling suspension 33.9 g (0.1 mol) of monoazoyl 4-nitro-2-aminophenol -> 1-phenyl-3-methyl-5-pyrsolone. After heating the reaction mixture (pH 8-9) at 85-90 ° C for 1 hour, an orange solution of an asymmetric 1: 2 chromium complex is formed. The pH of the dye solution is adjusted to 7 by the addition of hydrochloric acid and the solution ae is evaporated. 125 g of a strong, highly soluble dye are obtained, which dyes wool and the polyamide in an orange shade from a neutral to slightly acidic medium.

Claims (1)

PRIORITY OF THE INVENTION Orange 1: 2 chromocomplex azo dye of formula I