Process for the preparation of quinacridones from...

Details Process for the preparation of quinacridones from... Process for the preparation of quinacridones from...

C - Chemistry, Metallurgy

09

B

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

Patent

CA 2155499

Process for the Preparation of quinacridones from dihydroquinacridones in an aqueous medium An aqueous phase air oxidation process for the for the preparation of unsubstituted and substituted quinacridone pigments is disclosed. The process involves an oxidation step wherein a 6,1 3-dihydroquinacridone is converted to the corresponding quinacridone, utilizing a quinone compound and molecular oxygen as oxidizing agent, in a basic, aqueous reaction medium, in the presence of a nonionic, polar organic material which forms a second liquid phase in the basic reaction medium and which is present in a minor amount relative to the amount of aqueous base in the reaction medium. The quinacridonesprepared by this process are useful as pigments.

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