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

1987-03-23

1990-06-12

Higel, Floyd D.

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

Organic compounds

Azo

534696, 534697, 534698, 534699, 534887, C09B 4516, C09B 4502, C09P 4506

Patent

active

049334379

ABSTRACT:
The invention relates to a process for the preparation of asymmetrical 1:2 chromium complex azo 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 identical diazo components or identical coupling components, in the molar ratio of 0.85:1.0 to 1.2:1.0, with the proviso that only one of said two azo dyes 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: 2906746 (1959-09-01), Brassel et al.
patent: 2985646 (1961-05-01), Schetty et al.
patent: 3432485 (1969-03-01), Neier
patent: 3939140 (1976-02-01), Meininger et al.
patent: 4083839 (1978-04-01), Back et al.
patent: 4234479 (1980-11-01), Mennicke et al.
patent: 4396544 (1983-08-01), Dore
Rompps, Chemie Lexikon, Neumuller (1979).
Beffa et al, "Review of Progress in Coloration", vol. 14, pp. 33 to 42 (1984).
"Metal-Complex Dyes for Wool and Nylon-1930 to Date", from Review of Progress in Coloration, vol. 14, 33-42 (1984), Beffa et al.

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