Use of aluminum azo complex dyes as charge control agents

A method of coloring and improving the charge of electrophotographic toners and developers, powder coating materials, electret materials, inkjet inks and color filters, comprising adding a 2:1 aluminum azo complex dye to a binder of said electrophotographic toner or developer, powder coating material or electret material, to a color filter or an inkjet ink base, wherein the 2:1 aluminum azo complex dye has the formula (Ia), (Ib) or (Ic), ##STR21## where the two R.sup.3, independently of one another, are hydrogen, C.sub.1 -C.sub.3 -alkyl, C.sub.1 -C.sub.2 -alkoxy C.sub.2 -C.sub.3 -alkyl or phenyl;

• R.sup.4 is hydrogen, halogen, C.sub.1 -C.sub.2 -alkoxy or C.sub.1 -C.sub.2 -alkyl;
• the two R.sup.5, independently of one another, a 2-ethylhexyl radical or a phenyl radical which optionally carries up to three substituents, including up to two from the group consisting of chlorine, bromine, C.sub.1 -C.sub.2 -alkyl, C.sub.1 -C.sub.3 -alkoxy or acetyl;
• X.sub.1.sup.+ is a sodium, potassium, ammonium or (C.sub.1 -C.sub.4)alkylammonium ion, and where the two rings B in the formula (Ia) can each carry one or two substituents, including in each case one from the group consisting of halogen, hydoxyl, C.sub.1 -C.sub.2 -alkyl, C.sub.1 -C.sub.3 -alkoxy, acetyl, benzoyl or 4,6-bis(2',4'-dimethylphenyl)-triazin-2-yl, or the rings B carry the atomic group necessary to complete a naphthalene ring.