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：US20030091923A1

公开(公告)日：2003-05-15

申请号：US10173784

申请日：2002-06-19

Applicant: POWDERTECH CO., LTD.

Inventor： Hiromichi Kobayashi ,  Tsuyoshi Itagoshi ,  Takeshi Naito ,  Yuji Sato

IPC: G03G009/113

CPC classification number: G03G9/113 ,  G03G9/1136

Abstract: A resin-coated carrier to be mixed with a polymer toner obtained by suspension polymerization or emulsion polymerization to provide an electrophotographic developer, which exposes 2 to 20% of the surface area of the core thereof, the average exposed area ratio per exposed part of the core being 0.03% or less.

Abstract translation: 将树脂涂覆的载体与通过悬浮聚合或乳液聚合获得的聚合物调色剂混合以提供暴露其芯的表面积的2至20％的电子照相显影剂，每个暴露部分的平均曝光面积比 核心为0.03％以下。

公开(公告)号：US20040043320A1

公开(公告)日：2004-03-04

申请号：US10653598

申请日：2003-09-02

Applicant: POWDERTECH CO., LTD.

Inventor： Takeshi Naito ,  Hiromichi Kobayashi ,  Tsuyoshi Itagoshi ,  Yuji Sato

IPC: G03G009/113

CPC classification number: G03G9/00 ,  G03G9/0821 ,  G03G9/10 ,  G03G9/107

Abstract: The present invention provides a dry two-component type developer for electrophotography comprising a carrier particle and a toner particle, wherein a toner water adsorption ratio (T) obtained by a following equation (1) for the toner particle ranges from 1.0 to 7.0 and a carrier water adsorption ratio (C) obtained by a following equation (2) is 20.0 or less, and a water adsorption ratio (T/C) expressed in a following equation (3) representing a relationship between the toner water adsorption ratio (T) and the carrier water adsorption ratio (C) is 5.0 or less;a toner water adsorption ratio (T)nullnulla water adsorption amount (TH) of the toner particle/an N2 adsorption amount (TN) of the toner particlenullnullnull(1),a carrier water adsorption ratio (C)nullnulla water adsorption amount (CH) of the carrier particle/an N2 adsorption amount (CN) of the carrier particlenullnullnull(2), anda water adsorption ratio (T/C)nullnulla toner water adsorption ratio (T)/a carrier water adsorption ratio (C)nullnullnull(3).In the dry two-component type developer for electrophotography according to the present invention, even if use conditions are changed, a developing characteristic is less varied.

Abstract translation: 本发明提供了一种用于电子照相的干燥双组分型显影剂，其包含载体颗粒和调色剂颗粒，其中调色剂颗粒通过下式（1）获得的调色剂水吸附比（T）为1.0-7.0，和 由下式（2）得到的载体吸附水比（C）为20.0以下，表示调色剂水吸附倍数（T）的关系的下述式（3）表示的吸水率（T / C） 载体吸附率（C）为5.0以下; 调色剂水吸附率（T）= [调色剂颗粒的水吸附量（TH）/调色剂颗粒的N 2吸附量（TN）]（1），载体水吸附率（C）= [ 载体颗粒的吸附量（CH）/载体颗粒的N 2吸附量（CN）]（2），吸水率（T / C）= [调色剂水吸附率（T）/载体水 吸附比（C）]（3）。 在根据本发明的用于电子照相的干燥双组分型显影剂中，即使使用条件改变，显影特性也不太变化。

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：US20040248015A1

公开(公告)日：2004-12-09

申请号：US10861083

申请日：2004-06-04

Applicant: MITSUI MINING & SMELTING CO., LTD. ,  POWDERTECH CO., LTD.

Inventor： Yoichi Kamikoriyama ,  Kenji Suzuoka ,  Takashi Nakashima ,  Kazuya Kinoshita ,  Yuji Sato ,  Hiromichi Kobayashi ,  Takeshi Gondo ,  Takashi Hikichi

IPC: G03F009/00

CPC classification number: G03G9/107 ,  G03G9/1131 ,  G03G9/1132 ,  G03G9/1135 ,  G03G9/1136 ,  G03G9/1137 ,  G03G9/1139

Abstract: Provided are a carrier for electrophotography developers prepared with generating a slight amount of byproducts such as water, alcohol, etc, which carrier is free from release of a magnetic powder, has excellent mechanical strength and durability, and good environmental stability, and further can restrain occurrence of toner spent condition and has favorable fluidity and excellent capability of imparting charging to a toner, a two-component developer comprising the carrier and a method for forming an image using the developer. The carrier for electrophotography developers of the invention comprises a magnetic powder dispersed binder resin, the binder resin material comprises (A) a polysiloxane compound having an epoxy group as a functional group and (B) a polysiloxane compound having a group capable of ring-opening addition reaction with the epoxy group of the polysiloxane compound (A), and the binder resin is a silicone resin prepared by curing with ring-opening addition reaction of the epoxy resin. The developer of the invention comprises the carrier for electrophotography developers and the toner particle. The method for forming an image according to the invention comprises developing a static latent image by the developer with an alternating electric field.

Abstract translation: 提供了一种电子照相显影剂的载体，其制备了少量副产物如水，醇等，该载体不含磁性粉末的释放，具有优异的机械强度和耐久性，以及良好的环境稳定性，并且还可以抑制 调色剂消耗状况的发生，并且具有良好的流动性和对调色剂充电的优异能力，包含载体的双组分显影剂和使用显影剂形成图像的方法。 本发明的电子照相显影剂载体包括磁粉分散的粘合剂树脂，粘合剂树脂材料包含（A）具有环氧基作为官能团的聚硅氧烷化合物和（B）具有开环基团的聚硅氧烷化合物 与聚硅氧烷化合物（A）的环氧基的加成反应，粘合剂树脂是通过环氧树脂的开环加成反应固化而制备的硅树脂。 本发明的显影剂包括用于电子照相显影剂的载体和调色剂颗粒。 根据本发明的形成图像的方法包括用交变电场显影显影剂的静电潜像。

公开(公告)号：US20020177061A1

公开(公告)日：2002-11-28

申请号：US10059004

申请日：2002-01-30

Applicant: POWDERTECH CO., LTD.

Inventor： Hiromichi Kobayashi ,  Tsuyoshi Itagoshi ,  Yasuhiko Kataoka ,  Yuji Sato

IPC: G03G009/113

CPC classification number: G03G9/107 ,  G03G9/1075 ,  G03G9/1131 ,  G03G9/1136

Abstract: A carrier for an electrophotographic developer which has a flowability index F1, represented by formula (1), of 63 to 75 sec/(50nullcm3) and a flowability index F2, represented by formula (2), of 30 to 100 Oenullg/cm3:F1nullADnullFRnullnull(1)F2nullADnullHcnullnull(2)wherein AD is an apparent density (g/cm3); FR is a flow rate (sec/50 g); and Hc is a coercive force (Oe).

Abstract translation: 具有由式（1）表示的流动指数F1为63〜75秒/（50.cm 3）的电子照相显影剂载体和由式（2）表示的流动指数F2为30〜100Oe。 g / cm3：<段落lvl =“0”> F1 = ADxFR（1） <段落lvl =“0”> F2 = ADxHc（2）其中AD为表观密度（g / cm3）; FR为流速（sec / 50g）; Hc是矫顽力（Oe）。

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。