Preparation of 1:2 chromium complex azo dyes asymmetrically subs

Details Preparation of 1:2 chromium complex azo dyes asymmetrically subs Preparation of 1:2 chromium complex azo dyes asymmetrically subs

1985-03-04

1991-03-05

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Azo

534696, 534697, 534698, 534699, 534887, C09B 4502, C09B 4506, C09B 4516

Patent

active

049979175

ABSTRACT:
The invention relates to a process for the preparation of asymmetrical 1:2 chromium complex dyes of not less than 90% purity and containing at least one water-solubilizing group, which process comprises reacting a mixture of two metallizable azo dyes that contain different diazo components and different coupling components, or a mixture of a metallizable azo dye and a metallizable azomethine dye, in the molar ratio of 0.85:1.0 to 1.2:1.0, with the proviso that only one of said two mixture components contains at least one water-solubilizing group, with a chromium donor, under pressure and at a temperature above 100.degree. C. and in the pH range from 0 to 2, and subsequently carrying out further reaction in a weakly acid, neutral or weakly alkaline pH range, utilizing a single vessel for all steps.
The dyes obtained by the process of the invention are particularly suitable for dyeing wool or polyamide materials.

REFERENCES:
patent: 3432485 (1969-03-01), Neier
patent: 4234479 (1980-11-01), Mennicke et al.
patent: 4396544 (1983-08-01), Dore
"Metal-Complex Dyes for Wool and Nylon--1930 to Date", Review of Progress in Coloration and Related Topics vol. 14, 1984, pp. 33-42 (Beffa et al.).
Rompps Chemie-Lexikon, Dr. Otto-Albrecht Neumuller (1979).

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