Quinacridone process

Details Quinacridone process Quinacridone process

C - Chemistry, Metallurgy

07

D

260/275

C07D 471/04 (2006.01) C09B 48/00 (2006.01) C09B 67/52 (2006.01)

Patent

CA 1061344

TITLE: IMPROVED QUINACRIDONE PROCESS INVENTOR: ROBERT JARL NORTH ABSTRACT OF THE DISCLOSURE A method is provided for the direct pro- duction of the gamma crystalline phase of quinacridone. The method comprises ring closing a mixture of di- anilinoterephthalic acid and 10 - 20 weight percent of di-(ortho substituted) anilinoterephthalic acid in poly- phosphoric acid and thereafter diluting the product with water.

236659

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