Process for manufacturing pigmentary quinacridones

Details Process for manufacturing pigmentary quinacridones Process for manufacturing pigmentary quinacridones

C - Chemistry, Metallurgy

09

B

C09B 48/00 (2006.01) C09B 47/08 (2006.01)

Patent

CA 2429050

A process for preparing quinacridone pigments involving (a) preparing a reaction mixture of a substituted or unsubstituted 2,5-dianilino-terephthalic acid or ester thereof, and at least about 0.5 parts by weight of acid of a dehydrating agent; (b) combining the reaction mixture through one or more heated zones at a temperature of about 80 C to about 300 C; and (c) mixing the resulting crude quinacridone composition with a liquid in which the quinacridone pigment is substantially insoluble.

L'invention porte sur un procédé de préparation de pigments quinacridones qui consiste à (a) préparer un mélange de réaction d'un acide 2,5-dianilino-térephtalique substitué ou non substitué ou d'un ester de celui-ci, et d'au moins environ 0,5 parties en poids de l'acide d'un agent déshydratant; (b) combiner le mélange de réaction par l'intermédiaire d'une ou plusieurs zones chauffées à une température d'environ 80 ·C à environ 300 ·C; et (c) mélanger la composition de quinacridone brute obtenue avec un liquide dans lequel le pigment quinacridone est pratiquement insoluble.

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