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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
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.
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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
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.
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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
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.-
14.发明申请公开(公告)号：US20200033746A1
公开(公告)日：2020-01-30
申请号：US16483709
申请日：2018-01-15
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charging characteristics and strength with low specific gravity and with which a satisfactory image free of defects can be obtained, and a developer containing the carrier.A magnetic core material for electrophotographic developer, having a sulfur component content of from 60 to 800 ppm in terms of a sulfate ion and a pore volume of from 30 to 100 mm3/g.
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Patent Agency Ranking
15.发明公开公开(公告)号：US20240254004A1
公开(公告)日：2024-08-01
申请号：US18564394
申请日：2022-05-27
Applicant: POWDERTECH CO., LTD.
Inventor： Yuzuru YAMASAKI , Makoto ISHIKAWA , Tetsuya UEMURA
CPC classification number: C01G49/009 , G03G9/108 , G03G9/1132 , C01P2006/10 , C01P2006/42
Abstract: A ferrite particle having a spinel crystal structure belonging to a space group Fd-3m and having a ferrite composition represented by a specific formula, a carrier for an electrophotographic developer including the ferrite particle and a resin coating layer configured to coat a surface of the ferrite particle, an electrophotographic developer including the carrier for an electrophotographic developer and a toner, and a ferrite particle production method for producing the ferrite particle.
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公开(公告)号：US20230144641A1
公开(公告)日：2023-05-11
申请号：US17915348
申请日：2021-03-17
Applicant: POWDERTECH CO.,LTD.
Inventor： Makoto ISHIKAWA , Tetsuya UEMURA
CPC classification number: G03G9/1085 , G03G9/1132
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 2.0 μm or more and 4.5 μm or less, and satisfying the following formulas: 6.5≤log H1000≤8.5 and 0.80≤log H1000/log H100≤1.00. 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.
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17.发明申请公开(公告)号：US20190339628A1
公开(公告)日：2019-11-07
申请号：US16474497
申请日：2017-12-25
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charge characteristics and strength and with which a satisfactory image free from defects can be obtained, and a developer containing the carrier.A magnetic core material for electrophotographic developer, having a sulfur component content of from 50 to 700 ppm in terms of a sulfate ion and a BET specific surface area of from 0.06 to 0.25 m2/g.
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公开(公告)号：US20160216643A1
公开(公告)日：2016-07-28
申请号：US15007415
申请日：2016-01-27
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Tetsuya UEMURA
IPC: G03G9/00
CPC classification number: G03G15/0928 , G03G9/10 , G03G9/1075 , G03G9/1131 , G03G9/1132 , G03G9/1138
Abstract: An object of the present invention is to provide a carrier in which decrease in specific gravity is achieved and a volatile organic compound (VOC) is reduced and to provide an electrophotographic developer using the carrier. There is provided a carrier including a core material coated with a resin, the core material including a magnetic component and a nonmagnetic component, wherein the sum total of volatile organic compounds is 1 ppb or more and 1.5 ppm or less. There is also provided an electrophotographic developer using the carrier.
Abstract translation: 本发明的目的是提供一种其中实现比重降低并且挥发性有机化合物（VOC）减少并使用载体提供电子照相显影剂的载体。 提供了一种载体，其包括涂覆有树脂的芯材，该芯材包括磁性组分和非磁性组分，其中挥发性有机化合物的总和为1ppb以上且1.5ppm以下。 还提供了使用载体的电子照相显影剂。
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19.发明申请RESIN-COATED CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE RESIN-COATED CARRIER 有权使用树脂涂布载体的电子显影开发商和电子显影开发商的树脂涂层载体公开(公告)号：US20140295342A1
公开(公告)日：2014-10-02
申请号：US14227564
申请日：2014-03-27
Applicant: POWDERTECH CO., LTD.
Inventor： Makoto ISHIKAWA , Tetsuya UEMURA , Masashi AOKI
IPC: G03G9/113
CPC classification number: G03G9/1132 , G03G9/1075 , G03G9/1133 , G03G9/1134 , G03G9/1135 , G03G9/1136
Abstract: Provided is a resin-coated carrier for an electrophotographic developer, wherein the surface of a magnetic particle is coated with a mixed resin composed of two resins, and when the two resins are denoted by the resin 1 and the resin 2, respectively, the relative difference between the respective adsorbed moisture amounts of the resin 1 and the resin 2 at a temperature of 30° C. and a relative humidity of 80% satisfies the following formula (1): 1≦|ax−b(100−x)|≦10 (1) a: the adsorbed moisture content (% by weight) of the resin 1 b: the adsorbed moisture content (% by weight) of the resin 2 x: the content percentage of the resin 1 (0
Abstract translation: 提供一种用于电子照相显影剂的树脂涂覆载体，其中磁性颗粒的表面涂覆有由两种树脂组成的混合树脂，并且当两种树脂分别由树脂1和树脂2表示时，相对 在30℃，相对湿度80％的树脂1和树脂2的各吸附水分量之间的差别满足下式（1）：1＆nlE; | ax-b（100-x）| ＆lt; nlE; 10（1）a：树脂1b的吸附水分含量（重量％）b：树脂吸附的水分含量（重量％）2 x：树脂1的含量百分比（0
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