| abstract |
The invention relates to the use of layered double hydroxide salts as charge control agents in electrophotographic toners and developers, in coating powders, electret materials and in electrostatic separation processes, characterized in that the double hydroxide salt contains monovalent and/or bivalent and even trivalent metal cations, in addition to one or several organic anions of formula X—R—Y (I), wherein X=hydroxy, carboxy, sulphato or sulpho; Y=carboxy, sulphato or sulpho, and R=a bivalent aliphatic, cycloaliphatic, heterocycloaliphatic, olefinic, cycloolefinic, heterocycloolefinic, aromatic, heteroaromatic, araliphatic or heteroaraliphatic radical having at least 8 C atoms which can be substituted by one or several substituents from the group of hydroxy, amino, halogen, C 1 -C 22 -alkyl, C 1 -C 22 -alkoxy, carboxy, sulpho, nitro or cyano. |