Patent ID: 6416864
Filing Date: 2002-07-09
Classification: G03G,Y10S,Y10T

Abstract:
Black magnetic composite particles for a black magnetic toner, comprising:maghemite particles having an average particle diameter of 0.055 to 0.95 &mgr;m; a coating layer formed on the surface of said maghemite particles, comprising at least one organosilicon compound selected from the group consisting of: (1) organosilane compounds obtainable from alkoxysilane compounds, (2) polysiloxanes or modified polysiloxanes, and (3) fluoroalkyl organosilane compounds obtainable from fluoroalkylsilane compounds; and a carbon black coat formed on said coating layer comprising said organosilicon compound, in an amount of 1 to 25 parts by weight based on 100 parts by weight of said maghemite particles.