Oxidation process for preparing quinacridone pigments

Details Oxidation process for preparing quinacridone pigments Oxidation process for preparing quinacridone pigments

1997-05-09

1999-01-05

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D47104

Patent

active

058564888

ABSTRACT:
The present invention relates to a process of preparing quinacridone pigments in their specific crystal forms by oxidizing a premilled 6,13-dihydroquinacridone corresponding to the quinacridone pigment in a basic, aqueous reaction medium utilizing hydrogen peroxide as the oxidizing agent. The inventive process is an environmentally friendly process which yields a polymorphically homogeneous product in excellent yield.

REFERENCES:
patent: 3475436 (1969-10-01), Cooper et al.
patent: 4956464 (1990-09-01), Bender et al.
patent: 5229515 (1993-07-01), Pfenninger et al.
Efimov, N.K. et al, Khim. Prom-st. (Moscow), 1995, 12, pp. 751-753, online abstract only.

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