公开(公告)号：US20030186156A1

公开(公告)日：2003-10-02

申请号：US10393289

申请日：2003-03-21

Applicant: POWDERTECH CO., LTD

Inventor： Kanao Kayamoto ,  Issei Shinmura ,  Yuji Sato

IPC: G03G009/113

CPC classification number: G03G9/10 ,  G03G9/107 ,  G03G9/1075 ,  G03G9/1131

Abstract: A resin-coated carrier for an electrophotographic developer and a process of producing the carrier. The carrier comprises a ferrite core mainly comprising iron oxide, primarily having a spinel structure, and having a volume average particle size of 20 to 45 nullm and a resin coat, wherein the carrier has a magnetization of 65 to 80 emu/g in a magnetic field of 1 KOe, the core has an electric current value of 50 to 150 nullA and a surface smoothness uniformity of 75% or higher, and the amount of the resin coat is 0.1 to 5.0% by weight based on the core.

Abstract translation: 用于电子照相显影剂的树脂涂覆载体和制备载体的方法。 载体包括主要包含氧化铁的铁氧体磁芯，主要具有尖晶石结构，体积平均粒径为20至45μm，树脂涂层，其中载体磁化强度为65-80emu / g，磁性 1KOe的磁场，磁芯的电流值为50〜150μA，表面平滑度均匀度为75％以上，树脂涂层的含量为0.1〜5.0质量％。

公开(公告)号：US20020172884A1

公开(公告)日：2002-11-21

申请号：US10045010

申请日：2002-01-15

Applicant: POWDERTECH CO., LTD.

Inventor： Kanao Kayamoto ,  Issei Shinmura ,  Yuji Sato

IPC: G03G009/107

CPC classification number: G03G9/10 ,  G03G9/107 ,  G03G9/1075 ,  G03G9/1132

Abstract: A carrier for an electrophotographic developer comprising spherical magnetic core particles which have a volume average particle size of 25 to 45 nullm, an average void size of 10 to 20 nullm, a volume based particle size distribution having less than 1% of 22 nullm or smaller particles, a magnetization of 67 to 88 emu/g in a magnetic field of 1 kOe, and a difference of 10 emu/g or smaller in magnetization in a magnetic field of 1 kOe between scattered particles and remaining particles.

Abstract translation: 一种电子照相显影剂用载体，其包含体积平均粒径为25〜45μm，平均孔径为10〜20μm的球状磁性核颗粒，体积基准粒径分布小于22μm或更小的1％ 颗粒，在1kOe的磁场中的磁化强度为67至88emu / g，散射颗粒与剩余颗粒之间在1kOe的磁场中的磁化强度为10emu / g或更小。

公开(公告)号：US20020006570A1

公开(公告)日：2002-01-17

申请号：US09780519

申请日：2001-02-12

Applicant: POWDERTECH, CO., LTD.

Inventor： Kanao Kayamoto ,  Kazunori Takagi ,  Yuji Sato

IPC: G03G009/113

CPC classification number: G03G9/1139 ,  G03G9/1075

Abstract: A carrier for an electrophotographic developer which comprises a carrier core and a resin coat having a conducting agent dispersed therein, the resin coat having an inner layer on the carrier core side and an outer layer coating the inner layer, wherein the inner layer contains 7 to 20% by weight of a conducting agent based on the resinous solid content of the inner layer, the outer layer contains 3 to 15% by weight of a conducting agent based on the resinous solid content of the outer layer, and the conducting agent content of the inner layer is greater than that of the outer layer.

Abstract translation: 一种用于电子照相显影剂的载体，其包含载体芯和其中分散有导电剂的树脂涂层，所述树脂涂层在载体芯侧具有内层，涂覆有所述内层的外层，其中所述内层包含7〜 20重量％的导电剂，基于内层的树脂固体成分，外层含有3〜15重量％的导电剂，基于外层的树脂固含量，导电剂含量 内层大于外层的内层。