Patent ID: 7611812
Filing Date: 2009-11-03
Classification: C01F,C01P,C08K,C09C,C09D,G03G

Abstract:
1. A process for controlling the charge of an electrophotographic toner, electrophotographic developer, powder coating material, electret material or a chargeable material in an electrostatic separation process comprising the step of adding at least one charge control agent to the electrophotographic toner, electrophotographic developer, powder coating material electric material or chargeable material, wherein the at least one charge control agent is a layered double hydroxide salt comprising a combination of trivalent and divalent and optionally monovalent metal cations having hydroxyl groups wherein the number of hydroxyl groups in the layered double hydroxide salt is from 1.8 to 2.2 times the sum of all the metal cations wherein the layered double hydroxide salt contains Mg