Oxidation process for preparing quinacridone pigments

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

2007-01-09

2007-01-09

Saeed, Kamal A. (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

10517412

ABSTRACT:
The present invention relates to a process of preparing quinacridone by oxidizing a 6,13-dihydroquinacridone salt corresponding to the quinacridone pigment with hydrogen peroxide as the oxidizing agent in the presence of 2,7-anthraquinone disulfonic acid as catalyst. The inventive process is economical and environmentally friendly and yields high performance quinacridone pigments in a high yield.

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patent: 5840901 (1998-11-01), Bäbler
patent: 6225472 (2001-05-01), Bäbler
patent: 6264733 (2001-07-01), Bäbler
patent: 6803467 (2004-10-01), Grinter et al.
patent: 0697413 (1996-02-01), None
patent: 0806456 (1997-11-01), None
patent: 0894832 (1999-02-01), None

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