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：US20040229151A1

公开(公告)日：2004-11-18

申请号：US10773559

申请日：2004-02-06

Applicant: POWDERTECH CO., LTD.

Inventor： Hiromichi Kobayashi ,  Issei Shinmura ,  Tsuyoshi Itagoshi ,  Yuji Sato

IPC: G03G009/107

CPC classification number: G03G9/107 ,  G03G9/10 ,  G03G9/1136 ,  Y10T428/25

Abstract: A carrier core material containing at least one metal oxide (MLO) having a melting point of not higher than 1000null C. and at least one metal oxide (MHO) having a melting point of not lower than 1800null C., wherein the metal (MH) for constituting the metal oxide (MHO) has an electrical resistivity of not less than 10null5 nullnullcm. Also disclosed is a two-component developing agent comprising a coated carrier, which comprises the carrier core material coated with a resin, and toner particles. Further disclosed is an image forming method comprising developing an electrostatic latent image formed on a photosensitive member with the two-component developing agent using an alternating electric field. The carrier core material and the coated carrier have high magnetization and are free from occurrence of leakage of electric charge over a wide range of electric field from low electric field to high electric field. According to the two-component developing agent of the invention, an excellent image can be formed.

Abstract translation: 一种载体芯材，其含有熔点不高于1000℃的至少一种金属氧化物（M L）和至少一种熔点不低于的金属氧化物（MH）） 1800℃，其中用于构成金属氧化物（M H）的金属（M H））的电阻率不小于10 -5Ω·cm -1。 还公开了一种双组分显影剂，其包括涂覆载体，其包含涂覆有树脂的载体芯材料和调色剂颗粒。 进一步公开的是一种图像形成方法，其包括使用交变电场用双组分显影剂显影形成在感光构件上的静电潜像。 载体芯材和涂层载体具有高磁化强度，并且在从低电场到高电场的宽电场范围内不会发生电荷泄漏。 根据本发明的双组分显影剂，可以形成优异的图像。

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。