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    • 7. 发明授权
    • Electrophotographic magnetic dry developer containing cerium oxide and
hydrophobic silica
    • 含有氧化铈和疏水性二氧化硅的电子照相磁性干性显影剂
    • US4824752A
    • 1989-04-25
    • US108521
    • 1988-09-12
    • Satoshi YasudaMitsuru UchidaSeiichi TakagiYusuke Karami
    • Satoshi YasudaMitsuru UchidaSeiichi TakagiYusuke Karami
    • G03G9/08G03G9/097G03G9/14
    • G03G9/09783G03G9/09708Y10S430/104
    • A magnetic dry developer, comprising negatively chargeable insulating magnetic toner particles containing, at least, a binder resin, a magnetic substance, and an organo-chromium or -zinc complex; cerium oxide particles containing CeO.sub.2 as a predominant component and having a volume average particle size of 1.0 to 4.0 microns, a heating loss of 0.5 wt. % or less on heating up to 100.degree. C. and a BET specific surface area of 15 m.sup.2 /g or less as measured by the nitrogen adsorption method; and hydrophobicity-imparted negatively chargeable silicon oxide particulates. The cerium oxide particles have a function of disintegrating particularly the hydrophobicity-imparted silicon oxide particulates and enhance the attachment thereof to the toner particles, whereby the developing characteristics including the magnetic triboelectric chargeability are stabilized from the initial stage of electrophotographic copying operation.
    • 一种磁性干燥显影剂,包括至少含有粘合剂树脂,磁性物质和有机铬或锌络合物的可带负电荷的绝缘磁性调色剂颗粒; 含有CeO 2作为主要成分并且体积平均粒径为1.0〜4.0微米的氧化铈粒子,0.5重量%的加热损失。 加热至100℃时的%以下,通过氮吸附法测定的BET比表面积为15m 2 / g以下。 和疏水性赋予的带负电荷的氧化硅微粒。 氧化铈颗粒具有特别是疏水性赋予氧化硅微粒的功能,并且增强了其与调色剂颗粒的连接性,从而从静电复制操作的初始阶段使包括磁摩擦带电性的显影特性稳定。