Preparation of beta quinacridone pigments

Details Preparation of beta quinacridone pigments Preparation of beta quinacridone pigments

C - Chemistry, Metallurgy

09

B

C09B 48/00 (2006.01)

Patent

CA 2505763

A novel method for the preparation of a beta quinacridone pigment is described by the oxidation of 6,13-dihydroquinacridone in the presence of polyvinyl pyrrolidone, a catalyst and optionally a particulate quinacridone and/or a particle growth inhibitor using hydrogen peroxide as the oxidant.

L'invention a trait à un nouveau procédé de préparation d'un pigment de béta quinacridone, qui consiste à oxyder une 6,13- dihydroquinacridone en présence de polyvinylpyrrolidone, d'un catalyseur, et éventuellement d'une quinacridone sous forme de particules et/ou d'un inhibiteur de croissance de particules, du peroxyde d'hydrogène étant utilisé en tant qu'oxydant.

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