| abstract |
The invention relates to hydrophobic salts of layered metal hydroxides, which can be obtained by adding one or more hydrophobic compounds from the group containing waxes and metallic soaps to a layered metal hydroxide salt in dispersion with intensive mixing, in a quantity of between 0.2 and 200 wt. % in relation to said metal hydroxide salt, the latter containing trivalent, bivalent and optionally monovalent metal cations and one or more organic anions A of formula (I) X-R-Y. In said formula: X represents hydrogen, hydroxy, carboxy, sulphato or sulpho; Y represents carboxy, sulphato or sulpho; and R represents an aliphatic, cycloaliphatic, heterocycloaliphatic, olefinic, cycloolefinic, heterocycloolefinic, aromatic, heteroaromatic, araliphatic or heteroaraliphatic group comprising between 2 and 50 C-atoms, whereby said group can contain one or more substituents from the group comprising hydroxy, amino, halogen, C1-C22 alkyl, C1-C22 alkoxy, C1-C22 alkene-(CO)-O-(CH2CH2O)0-50-alkyl, C1-C22 alkene-(CO)-O-(CH2CH2O)0-50-haloalkyl, carboxy, sulpho, nitro or cyano. The liquid medium is then optionally removed, dried and isolated to produce a powder. The inventive compounds are used as electrostatic charge control agents, in particular in the field of electrophotography. |