公开(公告)号：US09588453B2

公开(公告)日：2017-03-07

申请号：US14673557

申请日：2015-03-30

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki Sawamoto ,  Takao Sugiura

IPC: G03G9/113 ,  G03G9/10 ,  G03G9/107

CPC classification number: G03G9/10 ,  G03G9/1075 ,  G03G9/113 ,  G03G9/1131 ,  G03G9/1136 ,  G03G9/1138

Abstract: There is provided a resin-filled ferrite carrier for an electrophotographic developer, in which a void of a porous ferrite particle used as a ferrite carrier core material is filled with silicone resin, wherein a true specific gravity (Y) of the porous ferrite particle filled with the silicone resin and a Si/Fe value (X) measured by fluorescent X-ray elemental analysis satisfy the following inequality (1): −350X≦Y−4.83≦−100X  (1).

Abstract translation: 提供一种用于电子照相显影剂的树脂填充铁氧体载体，其中用作铁氧体载体芯材料的多孔铁氧体颗粒的空隙填充有硅树脂，其中填充的多孔铁氧体颗粒的真比重（Y） 与硅树脂和通过荧光X射线元素分析测得的Si / Fe值（X）满足以下不等式（1）： - 350 ¢X‰¤Y - 4.83‰¤ - 100 ¢X

公开(公告)号：US20160070193A1

公开(公告)日：2016-03-10

申请号：US14785676

申请日：2015-01-16

Applicant: POWDERTECH CO., LTD.

Inventor： Koji AGA

IPC: G03G9/107 ,  G03G9/113 ,  G03G9/08

CPC classification number: G03G9/1075 ,  C01G49/0036 ,  C01P2004/03 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/42 ,  G03G9/0819 ,  G03G9/107 ,  G03G9/1131

Abstract: It is an object of the present invention to provide a ferrite particle having a low apparent density, and being capable of maintaining various properties thereof in controllable states and filling a fixed volume in a small weight thereof, a ferrite carrier core material and a ferrite carrier for an electrophotographic developer using the ferrite particle, and the like. In order to achieve the object, there are employed the ferrite particle having a porous structure in the interior thereof and an outer shell structure on the outer periphery thereof, the ferrite carrier core material and the ferrite carrier for an electrophotographic developer using the ferrite particle, and an electrophotographic developer using the ferrite carrier.

Abstract translation: 本发明的目的是提供一种表观密度低的铁氧体颗粒，并且能够将其各种性能保持在可控状态并以小重量填充固定体积，铁氧体载体芯材和铁氧体载体 对于使用铁氧体颗粒的电子照相显影剂等。 为了实现该目的，在其内部使用具有多孔结构的铁氧体颗粒和其外周上的外壳结构，铁氧体载体芯材和使用铁氧体颗粒的电子照相显影剂的铁氧体载体， 和使用该铁氧体载体的电子照相显影剂。

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：US12134567B2

公开(公告)日：2024-11-05

申请号：US17794394

申请日：2021-01-22

Applicant: POWDERTECH CO., LTD.

Inventor： Takashi Kojima ,  Koji Aga

IPC: C01G49/00 ,  H01F1/34 ,  H01F1/37

Abstract: Provided are a ferrite powder that suppresses decreases in saturation magnetization and decreases in filler filling ratio and also suppresses inhibition of resin curing, and a method for producing the same. A ferrite powder composed of spherical ferrite particles, wherein the ferrite powder contains iron (Fe) 54.0-70.0 mass % and manganese (Mn) 3.5-18.5 mass %, has an average volume particle size of 2.0-20.0 μm, and has a carbon content of 0.100 mass % or lower.

公开(公告)号：US20240264546A1

公开(公告)日：2024-08-08

申请号：US18564577

申请日：2022-05-27

Applicant: POWDERTECH CO., LTD.

Inventor： Yuzuru YAMASAKI ,  Makoto ISHIKAWA ,  Tetsuya UEMURA

IPC: G03G9/107 ,  C01G49/06

CPC classification number: G03G9/1085 ,  C01G49/06 ,  C01P2002/32 ,  C01P2002/70 ,  C01P2006/12

Abstract: The present invention provides a ferrite particle containing: a ferrite particle body having a spinel crystal structure belonging to a space group Fd-3m and having a spinel composition represented by the following formula (1); and a coating layer having a spinel crystal structure belonging to the space group Fd-3m and coating a surface of the ferrite particle body, in which the coating layer is a layer obtained by subjecting the ferrite represented by the following formula (1) to a heat treatment, and a content ratio of the coating layer in the ferrite particle obtained by subjecting a powder X-ray diffraction pattern to Rietveld analysis is 5 mass % or more and 35 mass % or less, and the ferrite particle satisfies a specific formula (2). The present invention also provides a carrier for an electrophotographic developer.

公开(公告)号：US20240128001A1

公开(公告)日：2024-04-18

申请号：US18275785

申请日：2022-02-09

Applicant: POWDERTECH CO., LTD.

Inventor： Kazutaka ISHII ,  Koji AGA

IPC: H01F1/34

CPC classification number: H01F1/344

Abstract: A magnetic composite includes a resin base material and a ferrite layer provided on a surface of the resin base material, the resin base material has a thickness of 10 μm or more, and the ferrite layer has a thickness of 2.0 μm or more, contains spinel-type ferrite as a principal component, and has a ratio of 0.00 or more and 0.03 or less, wherein the ratio is of an integrated intensity of a 222 plane to an integrated intensity of a 311 plane in X-ray diffraction analysis.

公开(公告)号：US20230152726A1

公开(公告)日：2023-05-18

申请号：US17915345

申请日：2021-03-17

Applicant: POWDERTECH CO.,LTD.

Inventor： Makoto ISHIKAWA ,  Tetsuya UEMURA

IPC: G03G9/107 ,  C04B35/26 ,  G03G9/08 ,  G03G9/113

CPC classification number: G03G9/1085 ,  C04B35/2625 ,  G03G9/0821 ,  G03G9/1132 ,  C04B2235/763 ,  C04B2235/768 ,  C04B2235/963 ,  C04B2235/3248 ,  C04B2235/3274

Abstract: The present invention relates to a ferrite particle containing a crystal phase component containing a perovskite crystal represented by a compositional formula: RZrO3 (provided that R represents an alkaline earth metal element), having a surface roughness Rz of 0.8 µm or more and 3.5 µm or less, and having a standard deviation Rzσ of the surface roughness Rz falling in a range represented by the following formula 0.15 × Rz ≤ Rzσ ≤ 0.60 × Rz. The ferrite particle can be used as an electrophotographic developer carrier core material. In addition, an electrophotographic developer carrier and an electrophotographic developer can be obtained.

公开(公告)号：US20220155701A1

公开(公告)日：2022-05-19

申请号：US17433591

申请日：2020-02-20

Applicant: POWDERTECH CO., LTD.

Inventor： Makoto ISHIKAWA ,  Tetsuya UEMURA

IPC: G03G9/107 ,  C01G49/00 ,  G03G9/113 ,  H01F1/36

Abstract: The present invention provides: a ferrite particle containing a crystal phase component containing a perovskite crystal represented by the compositional formula RZrO3 (where R is an alkaline earth metal element); and an electrophotographic developer carrier core material, an electrophotographic developer carrier, and an electrophotographic developer containing the ferrite particles.

公开(公告)号：US11072537B2

公开(公告)日：2021-07-27

申请号：US16095710

申请日：2017-04-11

Applicant: Powdertech Co., Ltd.

Inventor： Koji Aga ,  Tetsuya Igarashi

IPC: C01G49/00 ,  H01F1/20 ,  C01G49/02 ,  A47J36/02 ,  C08K3/22 ,  C08L101/00 ,  H01F1/37 ,  H05B6/74 ,  C08K7/16

Abstract: Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: soft ferrite particles containing Mn of 3.5 mass % or more and 20.0 mass % or less and Fe of 50.0 mass % or more and 70.0 mass % or less. It is preferable that a volume average particle diameter of the particles constituting the ferrite powder is 0.1 μm or more and 100 μm or less. It is preferable that magnetization by a VSM measurement when magnetic field of 5 K·1000/4πA/m is applied is 85 A·m2/kg or more and 98 A·m2/kg or less.

公开(公告)号：US20210080847A1

公开(公告)日：2021-03-18

申请号：US16641987

申请日：2018-03-06

Applicant: POWDERTECH CO., LTD.

Inventor： Hiroki SAWAMOTO ,  Tetsuya UEMURA

IPC: G03G9/107 ,  G03G9/08 ,  G03G9/113

Abstract: To provide a magnetic core material for electrophotographic developer and carrier for electrophotographic developer which have small environmental dependence of the electric resistance, can suppress the carrier scattering, and can stably provide good images; a developer contains the carrier; a method for producing the magnetic core material for electrophotographic developer; a method for producing the carrier for electrophotographic developer, and a method for producing the developer.
The magnetic core material for electrophotographic developer, satisfying a value of Formula (1): a+b×10+c+d+e+f, being from 20 to 150, when a fluoride ion amount is denoted by a (ppm), a chloride ion amount is denoted by b (ppm), a bromide ion amount is denoted by c (ppm), a nitrite ion amount is denoted by d (ppm), a nitrate ion amount is denoted by e (ppm), and a sulfate ion amount is denoted by f (ppm), which are measured by a combustion ion chromatography method.