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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
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.
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2.发明申请公开(公告)号：US20190163081A1
公开(公告)日：2019-05-30
申请号：US16200338
申请日：2018-11-26
Applicant: POWDERTECH CO., LTD.
Inventor： Yuzuru YAMASAKI , Takao SUGIURA , Takeshi NAITO , Tetsuya UEMURA
Abstract: Provided are a ferrite carrier core material for an electrophotographic developer having a full length L1 of grain boundary and a circumference length L2 of the core material in a cross-section of the core material, and satisfying a relationship of 2≤L1/L2≤9; a carrier for an electrophotographic developer including the ferrite carrier core material and a coating layer containing a resin provided on a surface of the ferrite carrier core material; and an electrophotographic developer including the carrier and a toner.
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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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