Oxidation process for preparing quinacridone pigments

Details Oxidation process for preparing quinacridone pigments Oxidation process for preparing quinacridone pigments

C - Chemistry, Metallurgy

09

B

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

Patent

CA 2489989

The present invention relates to a process of preparing quinacridone by oxidizing a 6,13-dihydroquinacridone salt corresponding to the quinacridone pigment with hydrogen peroxide as the oxidizing agent in the presence of 2,7- anthraquinone disulfonic acid as catalyst. The inventive process is economical and environmentally friendly and yields high performance quinacridone pigments in a high yield.

L'invention concerne un procédé permettant de préparer de la quinacridone par oxydation d'un sel de 6,13-dihydroquinacridone correspondant au pigment quinacridone, en utilisant un peroxyde d'hydrogène en tant qu'agent oxydant, en présence d'acide 2,7-anthraquinone disulfonique en tant que catalyseur. Ce procédé est économique, ménage l'environnement, et permet produire des pigments de quinacridone de haute qualité avec un rendement élevé.

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