Process for making quinacridone and its derivatives

Details Process for making quinacridone and its derivatives Process for making quinacridone and its derivatives

1976-09-17

1977-12-20

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, C09B 4800

Patent

active

040641295

ABSTRACT:
A process is described for making quinarcridone and its derivatives, useful as organic pigments, wherein a 2,5-diarylaminoterephthalic acid and an acid catalyst are heated in a two phase liquid system, comprising ethylene glycol and an organic liquid which is immiscible with water and ethylene glycol, wherein the ethylene glycol is present in an amount of about 0.25 to 4 parts by weight per part of 2,5-diarylaminoterephthalic acid and the organic liquid is present in an amount of at least about 2 parts by weight per part of ethylene glycol, at a temperature sufficient to remove by-product water from the liquid system by vaporization.

REFERENCES:
patent: 3261836 (1966-07-01), Chen
patent: 3264299 (1966-08-01), Thomas et al.
patent: 3966726 (1976-06-01), Toth et al.

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