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    • 2. 发明授权
    • Magnetic carrier, two-component developer and image forming method
    • 磁性载体,双组分显影剂和成像方法
    • US6124067A
    • 2000-09-26
    • US358409
    • 1999-07-22
    • Yushi MikuriyaKenji OkadoKazumi Yoshizaki
    • Yushi MikuriyaKenji OkadoKazumi Yoshizaki
    • G03G9/08G03G9/097G03G9/107G03G9/113G03G15/08
    • G03G9/09708G03G9/09716G03G9/09725G03G9/107G03G9/1075G03G9/1132G03G9/1134G03G9/1135G03G9/1139
    • A magnetic carrier constituting a two-component developer for use in an electrophotographic image forming method is formed of a carrier core comprising a first resin and magnetic fine particles dispersed in the first resin, and a second resin surface-coating the carrier core. (a) The magnetic carrier has a true specific gravity of 2.5-4.5, a magnetization .sigma..sub.1000 as measured in a magnetic field of 1000.times.(10.sup.3 /4.pi.).multidot.A/m (1000 oersted) of 15-60 Am.sup.2 /kg (emu/g), a residual magnetization .sigma..sub.r of 0.1-20 Am.sup.2 /kg (emu/g) and a resistivity of 5.times.10.sup.11 -5.times.10.sup.15 ohm.cm. (b) The first resin has a polymer chain including a methylene unit (--CH.sub.2 --). (c) The second resin has at least a fluoro-alkyl unit, a methylene unit (--CH.sub.2 --) and an ester unit. (d) The carrier core is surface-coated with (i) a mixture of the second resin and a coupling agent having at least an amino group and a methylene unit, or (ii) a coupling agent having at least an amino group and a methylene unit, and then with the second resin.
    • 构成用于电子照相成像方法的双组分显影剂的磁性载体由包含分散在第一树脂中的第一树脂和磁性细颗粒的载体芯和表面涂覆载体芯的第二树脂形成。 (a)磁性载体的真比重为2.5-4.5,在1000×(103/4 pi)×A / m(1000奥斯特)为15-60Am 2 / kg(emu)的磁场中测量的磁化σ1000 / g),剩余磁化σr为0.1-20Am 2 / kg(emu / g),电阻率为5×10 11 -5×10 15欧姆·厘米。 (b)第一树脂具有包含亚甲基单元(-CH 2 - )的聚合物链。 (c)第二树脂具有至少氟烷基单元,亚甲基单元(-CH 2 - )和酯单元。 (d)载体芯表面涂覆有(i)第二树脂和至少具有氨基和亚甲基单元的偶联剂的混合物,或(ii)至少具有氨基的偶联剂和 亚甲基单元,然后与第二树脂。
    • 4. 发明授权
    • Two-component type developer and image forming method
    • 双组分型显影剂和成像方法
    • US06312862B1
    • 2001-11-06
    • US09434401
    • 1999-11-05
    • Kenji OkadoRyoichi FujitaYushi MikuriyaShinya YachiKazumi Yoshizaki
    • Kenji OkadoRyoichi FujitaYushi MikuriyaShinya YachiKazumi Yoshizaki
    • G03G9113
    • G03G9/097G03G9/0819G03G9/10G03G9/107G03G9/113
    • A two-component type developer has a negatively chargeable toner having toner particles and an external additive and a magnetic-fine-particle-dispersed resin carrier. The magnetic-fine-particle-dispersed resin carrier has composite particles containing at least inorganic compound particles and a binder resin. The inorganic compound particles have been surface-treated with a lipophilic-treating agent having at least one type of functional group (A) selected from the group consisting of an epoxy group, an amino group, a mercapto group, an organic acid group, an ester group, a ketone group, an alkyl halide group and an aldehyde group, or a mixture of the agent. The composite particles have been surface-coated with at least one type of coupling agent having at least one type of functional group (B) different from the functional group (A) the lipophilic-treating agent. The functional group (B) the coupling agent has being a functional group or groups selected from the group consisting of an epoxy group, an amino group and a mercapto group. The negatively chargeable toner has a weight-average particle diameter of from 3 &mgr;m to 9 &mgr;m.
    • 双组分型显影剂具有带负电荷的调色剂,其具有调色剂颗粒和外部添加剂和磁性微粒分散树脂载体。 磁性粒子分散树脂载体具有至少含有无机化合物粒子和粘合剂树脂的复合粒子。 无机化合物颗粒已经用具有至少一种选自环氧基,氨基,巯基,有机酸基,官能团(A)中的至少一种官能团(A)的亲脂性处理剂进行表面处理 酯基,酮基,烷基卤基和醛基,或者该试剂的混合物。 复合颗粒已经用至少一种类型的具有至少一种类型的官能团(B)的不同于亲脂性处理剂的官能团(A)的偶联剂进行表面涂覆。 官能团(B)偶联剂是选自环氧基,氨基和巯基的官能团或基团。 负带电性调色剂的重均粒径为3〜9μm。