Process for preparing modified .beta.-quinacridone pigment

Details Process for preparing modified .beta.-quinacridone pigment Process for preparing modified .beta.-quinacridone pigment

1991-06-07

1993-07-20

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C09B 4800

Patent

active

052295150

ABSTRACT:
A process for preparing a modified beta quinacridone polytype having identified color space values which comprises the steps of dry pre-milling beta phase quinacridone, deaggregating the pre-milled product in an alcohol-base medium and ripening the deaggregated product in the presence of an oxidizing agent.

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Denison et al., "Bead Milling-A Practical Guide" Milling, presented at the New Castle Section Seminar, Paint Manufacture: 24 Apr. 1990, Durham University.
Schuetze et al. Chem. Abstr. vol. 113 Entry 154271c Abstract German 3834748 (1990).

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