Preparation of beta quinacridone pigments

Details Preparation of beta quinacridone pigments Preparation of beta quinacridone pigments

2005-03-08

2005-03-08

Huang, Evelyn Mei (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C546S056000, C546S057000, C106S497000, C106S495000

Reexamination Certificate

active

06864371

ABSTRACT:
A novel method for the preparation of a beta quinacridone pigment is described by the oxidation of 6,13-dihydroquinacridone in the presence of polyvinyl pyrrolidone, a catalyst and optionally a particulate quinacridone or particle growth inhibitor using hydrogen peroxide as the oxidant.

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