Process for the preparation of a dyestuff consisting substantial

Details Process for the preparation of a dyestuff consisting substantial Process for the preparation of a dyestuff consisting substantial

1974-06-17

1976-02-17

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260145B, 260163, 260193, 260197, 260202, C09B 4506, C09B 4516

Patent

active

039391400

ABSTRACT:
Process for preparing a dyestuff consisting essentially of only unsymmetrical 1:2-chromium complex azo dyestuffs by heating a mixture of o,o'-dihydroxy azo dyestuffs and o-carboxy-o'-hydroxy azo dyestuffs, both being free from sulfonic acid groups, with chromium-III chloride in an organic solvent at a temperature of 105.degree. to 120.degree.C until the portion of o,o'-dihydroxy azo dyestuff is completely metallized and completing the 1:2-chromium complex formation by adjusting the pH-value to 5.0-6.5, and heating at a temperature of 70.degree. to 90.degree.C.

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patent: 3516980 (1970-06-01), Dore et al.
patent: 3522231 (1970-07-01), Bitterlin
patent: 3625937 (1971-12-01), Scholl
patent: 3632568 (1972-01-01), Neier

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