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：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：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：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）。