Patent Number: 6,251,553

Title: Use of mixed-crystal pigments of the quinacridone series in electrophotographic toners and developers, powder coatings and inkjet inks

Abstract: The use of mixed-crystal pigments of the quinacridone series consisting of a) from 85 to 99% by weight of unsubstituted .beta.-phase quinacridone of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 are hydrogen atoms, and b) from 1 to 15% by weight of one or more substituted quinacridones of the formula (I) in which the substituents R.sup.1 and R.sup.2 are identical or different and are chlorine, bromine or fluorine atoms or C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or carboxamido groups, which can be substituted by C.sub.1 -C.sub.6 -alkyl groups, and R.sup.1 can additionally be hydrogen, as colorants in electrophotographic toners and developers, powder coating materials, inkjet inks, electret fibers, and color filters.

Inventors: Baur; Ruediger (Eppstein, DE), Urban; Manfred (Wiesbaden, DE), Macholdt; Hans-Tobias (Darmstadt, DE), Schnaitmann; Dieter (Eppstein, DE), Boehmer; Martin (Neu-Anspach, DE)

Assignee: Clariant GmbH

International Classification: C09D 11/00 (20060101); C09D 5/03 (20060101); G03G 9/09 (20060101); G03G 9/12 (20060101); G03G 009/08 ()

Expiration Date: 06/26/2018