Process for the manufacture of symmetric 1:2 chromium complexes

Details Process for the manufacture of symmetric 1:2 chromium complexes Process for the manufacture of symmetric 1:2 chromium complexes

1974-01-10

1976-03-02

Warren, Charles F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260145R, 260145A, 260145B, 260145C, 260146R, 260146D, 260146T, 260147, 260148, 260149, 260150, C09B 4506, C09B 4516

Patent

active

039417654

ABSTRACT:
The present invention relates to a process for the manufacture of 1:2 chromium complexes of metallisable azo dyes, wherein the azo dyes are treated in aqueous solution at pH 7 to 9 with at least the stoichiometric amount of a chromium complex, and, in the course of the chroming, the reaction medium is acidified once or repeatedly to a pH of 6 or less and subsequently brought back again to pH 7 to 9.

REFERENCES:
patent: 1918938 (1933-07-01), Straub et al.
patent: 2829139 (1958-04-01), Strobel et al.
patent: 2891938 (1959-06-01), Schetty
patent: 2906746 (1959-09-01), Brassel et al.
patent: 2921061 (1960-01-01), Ackermann et al.
patent: 3185676 (1965-05-01), Klein
price, "VII, The Chemistry of Metal Complex Dyestuffs," The Chemistry of Synthetic Dyes, K. Venkataraman, Ed., Vol. III, Academic Press: New York, 1970, pp. 334-341.

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