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    • 44. 发明申请
    • TWO-COMPONENT DEVELOPER
    • 两组分开发商
    • US20100310978A1
    • 2010-12-09
    • US12864447
    • 2009-03-10
    • Tomoko EndoKoh IshigamiNaoki OkamotoYoshinobu Baba
    • Tomoko EndoKoh IshigamiNaoki OkamotoYoshinobu Baba
    • G03G9/083
    • G03G9/107G03G9/0819G03G9/0827G03G9/10G03G9/1075G03G9/113G03G9/1133
    • Provided is a two-component developer containing: a magnetic carrier obtained by coating a magnetic core with a resin; and toner, in which: the magnetic core contains at least a ferrite component and at least one kind of an oxide selected from the group consisting of SiO2 and Al2O3; the content of the oxide is 4.0 mass % or more and 40.0 mass % or less with respect to the magnetic core; the magnetic core has a specific resistance of 5.0×104 Ω·cm or more and 5.0×108 Ω·cm or less at the time of the application of 1,000 V/cm; the magnetic carrier has an intensity of magnetization in 79.6 kA/m of 40.0 Am2/kg or more and 65.0 Am2/kg or less, and a residual magnetization after the application of an external magnetic field of 79.6 kA/m of 3.0 Am2/kg or less; and the toner has a weight-average particle diameter (D4) of 3.0 gin or more and 10.0 μm or less and an average circularity of 0.940 or more and 0.990 or less.
    • 提供了一种双组分显影剂,其包含:通过用树脂涂覆磁芯获得的磁性载体; 和调色剂,其中:所述磁芯至少包含铁氧体组分和至少一种选自SiO 2和Al 2 O 3的氧化物; 相对于磁芯,氧化物的含量为4.0质量%以上且40质量%以下。 磁芯在施加1000V / cm时的电阻率为5.0×104&OHgr··cm以上且5.0×108Ω·cm·cm以下。 磁性载体的强度为79.6kA / m,为40.0Am 2 / kg以上且65.0Am 2 / kg以下,在施加79.6kA / m 3的外部磁场后的剩余磁化强度为3.0Am 2 / kg 或更少; 调色剂的重均粒径(D4)为3.0gin以上且10.0μm以下,平均圆形度为0.940以上且0.990以下。