| 摘要 |
Black magnetic toner comprising:a binder resin, andblack magnetic composite particles comprising:magnetic iron oxide particles having an average particle diameter of 0.055 to 0.95 mum;a coating layer formed on the surface of said magnetic iron oxide 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; anda 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 magnetic iron oxide particles.Such a black magnetic toner can be free from being deteriorated in electric resistance due to the existence of the carbon black coat, and as a result, is suitable as a high-resistance or insulated magnetic toner.
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