| 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 the magnetic iron oxide particles, comprising at least one organosilicon compound selected from the group consisting of:(1) organosilane compounds obtainable from alkoxysilane compounds, and(2) polysiloxanes or modified polysiloxanes, and a carbon black coat formed on the coating layer comprising the organosilicon compound, in an amount of 26 to 55 parts by weight based on 100 parts by weight of the 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-resistant or insulated magnetic toner.
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