The use of aromatic compounds as phase directors and...

Details The use of aromatic compounds as phase directors and... The use of aromatic compounds as phase directors and...

C - Chemistry, Metallurgy

09

B

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

Patent

CA 2442001

The present invention relates to a process for producing alpha, gamma-I, gamma- II and gamma-III crystal modifications of quinacridone and transparent quinacridone pigments including the solid solutions of various quinacridones, using a variety of tris-aryl-s-triazines, particularly resorcinol triazine derivatives, or aromatic- or heteraromatic-compounds having at least one hydroxyl or keto group bonded to the ring, as an additive, prior to or concurrently with the oxidation of corresponding dihydroquinacridone salts.

L'invention concerne un procédé permettant de produire des modifications de cristaux alpha, gamma-I, gamma-II et gamma-III de quinacridone et de pigments de quinacridone transparents comprenant les solutions solides de différentes quinacridones, à l'aide d'une variété de tris-aryl-s-triazines, en particulier de dérivés de résorcinol triazine, ou des composés aromatiques ou hétéroaromatiques ayant au moins un groupe hydroxyle ou céto lié au composé cyclique, comme additif, avant ou simultanément à l'oxydation de sels de dihydroquinacridone correspondants.

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