MIXED CRYSTAL PIGMENTS OF THE QUINACRIDONE SERIES MIXED CRYSTAL PIGMENTS OF THE QUINACRIDONE SERIES

摘要

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