Oxidation process for highly dispersible quinacridone pigments

Details Oxidation process for highly dispersible quinacridone pigments Oxidation process for highly dispersible quinacridone pigments

2005-03-15

2005-03-15

Aulakh, Charanjit S. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C546S056000, C546S047000

Reexamination Certificate

active

06867301

ABSTRACT:
A process for the preparation of a quinacridone comprises oxidation of a 6,13-dihydroquinacridone using hydrogen peroxide, wherein a polymeric dispersant is present in the oxidation reaction mixture. The resulting pigment products exhibit greatly improved dispersibility relative to pigments in which the polymeric dispersant is not present during the oxidation reaction.

REFERENCES:
patent: 5840901 (1998-11-01), Bäbler
patent: 5856488 (1999-01-01), Bäbler
patent: 6013127 (2000-01-01), Bäbler

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