Use of salts of layered double hydroxides as charge control...

G - Physics – 03 – G

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G03G 9/097 (2006.01) C01F 7/00 (2006.01) C01G 31/00 (2006.01) C08K 5/00 (2006.01) C08K 5/098 (2006.01) C08K 5/41 (2006.01) C09C 1/40 (2006.01) C09D 5/03 (2006.01) H01G 7/02 (2006.01)

Patent

CA 2494652

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, C1-C22-alkyl, C1-C22-alkoxy, carboxy, sulpho, nitro or cyano.

La présente invention concerne l'emploi de sels de doubles hydroxydes en couches en tant qu'agents de régulation de la charge dans des révélateurs et des toners électrophotographiques, dans des laques en poudre, des substances d'électret et dans des processus de séparation électrostatique. L'invention se caractérise en ce que le sel de double hydroxyde comprend des cations de métaux monovalents et/ou bivalents et/ou trivalents et un ou plusieurs anions organiques de formule (I) dans laquelle: X est hydroxy, carboxy, sulfato ou sulfo; Y est carboxy, sulfato ou sulfo; et R est un radical bivalent aliphatique, cycloaliphatique, hétérocycloaliphatique, oléfinique, cyclooléfinique, hétérocyclooléfinique, aromatique, hétéroaromatique, araliphatique ou hétéroaraliphatique qui comprend au moins 8 atomes de C et peut être substitué par un ou plusieurs substituants issu du groupe qui comprend hydroxy, amino, halogène, alkyle en C¿1?-C¿22?, alcoxy en C¿1?-C¿22?, carboxy, sulfo, nitro ou cyano.

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