Process for preparing gamma quinacridone from polyphosphoric...

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

C - Chemistry, Metallurgy

09

B

260/275

C09B 48/00 (2006.01) C09B 67/52 (2006.01)

Patent

CA 1050984

INVENTOR: Robert Jarl North INVENTION: Process for Preparing Gamma Quinacridone From Polyphosphoric Acid and Alcohol ABSTRACT OF THE DISCLOSURE A method is provided for the direct production of gamma quinacridone pigment comprising ring closure of dianilinoterephthalic acid in polyphosphoric acid and diluting the mixture with alcohol while controlling the temperature at between 0° and 25°C.

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