Mixed crystal pigments of the quinacridone series

摘要

Mixed crystal pigments of the quinacridone series New quinacridone mixed crystal pigments consisting of a) from 85 to 99% by weight of unsubstituted beta -phase quinacridone of the formula (I) in which R1 and R2are hydrogen atoms and b) from 1 to 15% by weight of one or more substituted quinacridones of the formula (I) in which the substituents R1 and R2 are identical or different and are chlorine, bromine or fluorine atoms or C1-C4-alkyl, C1-C4-alkoxy or carboxamido groups which can be substituted by C1-C6-alkyl groups, and R1 may additionally be hydrogen, are valuable quinacridones in the red-violet range.