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    • 2. 发明申请
    • FERRITE CARRIER CORE MATERIAL AND FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, METHODS FOR MANUFACTURING THESE, AND ELECTROGRAPHIC DEVELOPER USING THE FERRITE CARRIER
    • 电子雕刻机的铁素体核心材料和铁素体载体,制造这些材料的方法以及使用铁素体载体的电子显影剂
    • US20130171558A1
    • 2013-07-04
    • US13823250
    • 2011-08-29
    • Tomoyuki SuwaToru IwataKoji Aga
    • Tomoyuki SuwaToru IwataKoji Aga
    • G03G9/113
    • G03G9/1136G03G9/107G03G9/1075G03G9/113
    • It is an object of the present invention to provide a ferrite carrier core material and a ferrite carrier for an electrophotographic developer, which have an excellent charging property, hardly cause carrier scattering due to cracking and chipping of the core material, and have a prolonged life, and methods for manufacturing these, and an electrophotographic developer using the ferrite carrier. For this object, the ferrite carrier core material and a ferrite carrier for an electrophotographic developer, wherein (1) the ferrite composition contains 0.5 to 2.5% by weight of Sr, and the presence amount of Sr—Fe oxides satisfies a specific conditional expression, (2) the distribution in the number of the shape factor SF-2 is in a specific range, (3) the BET specific surface area is 0.15 to 0.30 m2/g, (4) the average particle diameter D50 is 20 to 35 μm, and (5) the magnetization is 50 to 65 Am2/kg.
    • 本发明的目的是提供一种铁素体载体芯材和用于电子照相显影剂的铁氧体载体,其具有优良的充电性能,由于芯材的开裂和碎裂几乎不引起载体散射,并且具有延长的寿命 及其制造方法以及使用该铁氧体载体的电子照相显影剂。 对于该目的,铁氧体载体芯材和电子照相显影剂用铁氧体载体,(1)铁氧体组合物含有0.5〜2.5重量%的Sr,Sr-Fe氧化物的存在量满足特定条件式, (2)形状因子SF-2的数量分布在特定范围内,(3)BET比表面积为0.15〜0.30m2 / g,(4)平均粒径D50为20〜35μm ,(5)磁化强度为50〜65Am 2 / kg。