Process for preparing quinacridonequinone by oxidation of dihydr

Details Process for preparing quinacridonequinone by oxidation of dihydr Process for preparing quinacridonequinone by oxidation of dihydr

1976-02-20

1977-05-24

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C09B 4800

Patent

active

040255182

ABSTRACT:
Improved process for preparing quinacridonequinone by the oxidation of dihydroquinacridone in aqueous acidic medium using an alkali metal chlorate as the oxidizing agent in the presence of vanadium pentoxide and, optionally, passing air through the aqueous acidic medium during the oxidation. The quinacridonequinone so prepared exhibits superior color quality and is useful as a pigment in a wide variety of applications.

REFERENCES:
patent: 3185694 (1965-05-01), Jaffe et al.
patent: 3251845 (1966-05-01), Jaffe
patent: 3632588 (1972-01-01), Ehrich
Nagai et al., Kogyo Kagaku Zasshi 69(4), 669-674, (1966).

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