Preparation of .gamma.-quinacridone pigment

Details Preparation of .gamma.-quinacridone pigment Preparation of .gamma.-quinacridone pigment

1978-05-08

1980-04-08

Rollins, Alton D.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

106288Q, C09B 4800

Patent

active

041974042

ABSTRACT:
In a process for preparing pigmentary .gamma.-quinacridone by oxidizing .beta.-dihydroquinacridone with a mild alkali-stable oxidizing agent in a liquid medium consisting of alkali metal hydroxide, water and a polar, alkali-stable, water-soluble organic liquid, this invention provides for an improvement wherein the oxidation is conducted in the presence of 0.1% to 1% by weight of an o-carboxybenzamidomethyl quinacridone compound whereby the resulting .gamma.-quinacridone exhibits sufficiently high strength so that milling or solvent treatments to increase pigment strength are unnecessary.

REFERENCES:
patent: 3007930 (1961-11-01), Manger et al.
patent: 3275637 (1966-09-01), West
patent: 3738988 (1973-06-01), Jackson

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