Process for preparing gamma quinacridone from polyphosphoric aci

Details Process for preparing gamma quinacridone from polyphosphoric aci Process for preparing gamma quinacridone from polyphosphoric aci

1977-01-17

1978-07-11

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, C09B 4800

Patent

active

041001621

ABSTRACT:
A method is provided for the direct production of gamma quinacridone pigment comprising ring closure of 2,5-dianilinoterephthalic acid in polyphosphoric acid and diluting the mixture by addition thereof into a water-miscible alcohol containing 1-3 carbon atoms, e.g. methanol, while maintaining the temperature of the alcohol-acid at between 0.degree. and 25.degree. C.

REFERENCES:
patent: 3257405 (1966-06-01), Gerson et al.
patent: 3265699 (1966-08-01), Jaffe

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