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    • 9. 发明授权
    • Magnetic carrier for electrophotographic developer and process for producing the same, and two-component system developer
    • 用于电子照相显影剂的磁性载体及其制备方法,以及双组分体系显影剂
    • US08673529B2
    • 2014-03-18
    • US13377904
    • 2010-06-15
    • Kaori KinoshitaShinji UemotoEiichi Kurita
    • Kaori KinoshitaShinji UemotoEiichi Kurita
    • G03G9/113
    • G03G9/1131G03G9/107G03G9/1133G03G9/1134G03G9/1135G03G9/1137
    • The present invention relates to a magnetic carrier for an electrophotographic developer comprising spherical composite particles comprising spherical composite core particles comprising at least ferromagnetic iron oxide fine particles and a cured phenol resin and having an average particle diameter of 1 to 100 μm, and a melamine resin coating layer formed on the respective core particles, wherein a ratio of R100 to R300 (R100/R300) in which R100 is an electric resistance value as measured when applying a voltage of 100 V to the magnetic carrier; and R300 is an electric resistance value as measured when applying a voltage of 300 V to the magnetic carrier, is controlled to lie within the range of 1 to 50. The magnetic carrier according to the present invention is capable of maintaining an adequate electric resistance value upon development, providing images having an excellent image quality, exhibiting a good durability, obtaining a good reproducibility of uniform solid image portions having a high image density, and keeping high quality images having an excellent gradation for a long period of time.
    • 本发明涉及一种用于电子照相显影剂的磁性载体,其包含球形复合颗粒,该球形复合颗粒包含至少包含铁磁性氧化铁细颗粒和固化的酚醛树脂的平均粒径为1-100μm的球形复合芯颗粒和三聚氰胺树脂 形成在各个芯粒子上的涂层,其中R100与R300(R100 / R300)的比率,其中R100是当向磁性载体施加100V的电压时测量的电阻值; R300是向磁性载体施加300V的电压时测定的电阻值,被控制在1〜50的范围内。本发明的磁性载体能够保持足够的电阻值 在显影时,提供具有优异图像质量的图像,表现出良好的耐久性,获得具有高图像浓度的均匀立体图像部分的良好再现性,并且保持长时间具有优异灰度的高质量图像。
    • 10. 发明申请
    • MAGNETIC CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND PROCESS FOR PRODUCING THE SAME, AND TWO-COMPONENT SYSTEM DEVELOPER
    • 用于电子显影开发的磁性载体及其制造方法和两组分系统开发商
    • US20120115078A1
    • 2012-05-10
    • US13377904
    • 2010-06-15
    • Kaori KinoshitaShinji UemotoEiichi Kurita
    • Kaori KinoshitaShinji UemotoEiichi Kurita
    • G03G9/113
    • G03G9/1131G03G9/107G03G9/1133G03G9/1134G03G9/1135G03G9/1137
    • The present invention relates to a magnetic carrier for an electrophotographic developer comprising spherical composite particles comprising spherical composite core particles comprising at least ferromagnetic iron oxide fine particles and a cured phenol resin and having an average particle diameter of 1 to 100 μm, and a melamine resin coating layer formed on the respective core particles, wherein a ratio of R100 to R300 (R100/R300) in which R100 is an electric resistance value as measured when applying a voltage of 100 V to the magnetic carrier; and R300 is an electric resistance value as measured when applying a voltage of 300 V to the magnetic carrier, is controlled to lie within the range of 1 to 50. The magnetic carrier according to the present invention is capable of maintaining an adequate electric resistance value upon development, providing images having an excellent image quality, exhibiting a good durability, obtaining a good reproducibility of uniform solid image portions having a high image density, and keeping high quality images having an excellent gradation for a long period of time.
    • 本发明涉及一种用于电子照相显影剂的磁性载体,其包含球形复合颗粒,该球形复合颗粒包含至少包含铁磁性氧化铁细颗粒和固化酚醛树脂的平均粒径为1至100μm的球形复合芯颗粒和三聚氰胺树脂 形成在各个芯粒子上的涂层,其中R100与R300(R100 / R300)的比率,其中R100是当向磁性载体施加100V的电压时测量的电阻值; R300是向磁性载体施加300V的电压时测定的电阻值,被控制在1〜50的范围内。本发明的磁性载体能够保持足够的电阻值 在显影时,提供具有优异图像质量的图像,表现出良好的耐久性,获得具有高图像浓度的均匀立体图像部分的良好再现性,并且保持长时间具有优异灰度的高质量图像。