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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.-
2.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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公开(公告)号：US20220019151A1
公开(公告)日：2022-01-20
申请号：US17430440
申请日：2020-02-13
Applicant: POWDERTECH CO.,LTD.
Inventor： Aya SAKUTA , Makoto ISHIKAWA , Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: The present invention relates to a carrier including: a magnetic core material; and a resin coating layer coating a surface of the magnetic core material, in which the resin coating layer contains a binder resin, and fluorine element-containing resin particles dispersed in the binder resin, the resin coating layer has a coefficient of variation of a film thickness of 25% or less, and the resin coating layer has an average value of the number of the fluorine element-containing resin particles being 3 particles/μm2 or more and 350 particles/μm2 or less per unit area in a cross section of the resin coating layer, and has a coefficient of variation thereof being 20% or less.
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公开(公告)号：US20200241435A1
公开(公告)日：2020-07-30
申请号：US16751031
申请日：2020-01-23
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Atsushi NII , Yuji ITO , Hajime AKIBA , Shinya HANYU
Abstract: The present invention relates to a carrier core material for electrophotographic developer, having a ferrite composition and having a supernatant transmittance of 85.0% or more, a method for producing the carrier core material, a carrier for electrophotographic developer, containing the carrier core material, and a developer containing the carrier.
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公开(公告)号：US20190049870A1
公开(公告)日：2019-02-14
申请号：US16059405
申请日：2018-08-09
Applicant: POWDERTECH CO., LTD.
Inventor： Aya SAKUTA , Makoto ISHIKAWA , Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: There is provided a carrier including a magnetic core material having a surface coated with a surfactant-containing resin mixture of an elemental fluorine-containing resin and a polyimide resin. The carrier has an elution amount of an eluted material into water in an elution test ranging from 180 ppm to 3,500 ppm.
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Patent Agency Ranking
公开(公告)号：US20190204761A1
公开(公告)日：2019-07-04
申请号：US15779501
申请日：2018-03-06
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Tetsuya UEMURA
CPC classification number: G03G9/1075 , G03G9/0819 , G03G9/107 , G03G9/1131 , G03G9/1139
Abstract: To provide a magnetic core material for electrophotographic developer and carrier for electrophotographic developer which are excellent in a rising-up of charge amount, can suppress a carrier scattering, and can stably provide good images; a developer containing 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, containing a sulfur component in a content of from 1 to 45 ppm in terms of a sulfate ion.
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7.发明申请FERRITE CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, FERRITE CARRIER AND ELECTROPHOTOGRAPHIC DEVELOPER USING THE FERRITE CARRIER 审中-公开用于电子显影开发商的铁氰化物载体材料，使用铁素体载体的铁电载体和电子显影开发公开(公告)号：US20150277256A1
公开(公告)日：2015-10-01
申请号：US14671710
申请日：2015-03-27
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Hiromichi KOBAYASHI
CPC classification number: H01F1/01 , C01G49/0072 , C01P2004/03 , C01P2004/32 , C01P2004/61 , C01P2006/10 , C01P2006/11 , C01P2006/12 , C01P2006/42 , G03G9/107 , G03G9/1075 , H01F1/36 , Y10T428/2982
Abstract: There is provided a ferrite carrier core material for an electrophotographic developer, which includes ferrite particles. A volume average particle diameter of the ferrite particles is from 10 μm to less than 20 μm. Also, there is provided a ferrite core which includes the ferrite carrier core material, and a resin coating a surface of the ferrite carrier core material. Further, there is provided an electrophotographic developer which includes the ferrite carrier; and a toner, wherein a concentration of the toner is from 15 to 35 wt %.
Abstract translation: 提供了一种用于电子照相显影剂的铁氧体载体芯材料，其包括铁氧体颗粒。 铁氧体颗粒的体积平均粒径为10μm至小于20μm。 此外，还提供了一种铁氧体磁芯，其包括铁氧体载体芯材，以及涂覆铁氧体载体芯材表面的树脂。 此外，提供了包括铁氧体载体的电子照相显影剂; 和调色剂的浓度为15〜35重量％的调色剂。
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公开(公告)号：US20200057399A1
公开(公告)日：2020-02-20
申请号：US16492894
申请日：2018-03-29
Applicant: POWDERTECH CO., LTD.
Inventor： Makoto ISHIKAWA , Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: The present invention provides: a ferrite carrier core material for an electrophotographic developer, the material having a mesh passing amount of 3 wt % or less as indicated by the ratio of the weight of particles passing through a 16 μm-mesh to the weight of whole particles constituting a powder, and having a particle strength index of 2 wt % or less as indicated by a difference between the mesh passing amounts before and after crushing; a ferrite carrier which is for an electrophotographic developer and in which the surface of the ferrite carrier core material is coated with a resin; and an electrophotographic developer which includes the ferrite carrier and a toner.
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9.发明申请公开(公告)号：US20200026211A1
公开(公告)日：2020-01-23
申请号：US16483718
申请日：2018-01-15
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Tetsuya UEMURA
Abstract: A magnetic core material for electrophotographic developer, satisfying a value of Expression (1): a+b×10+c+d+e+f, being from 200 to 1,400, when an amount of fluorine ion is denoted by a (ppm), an amount of chlorine ion is denoted by b (ppm), an amount of bromide ion is denoted by c (ppm), an amount of nitrite ion is denoted by d (ppm), an amount of nitrate ion is denoted by e (ppm), and an amount of sulfate ion is denoted by f (ppm), which are measured by combustion ion chromatography; and having a pore volume of from 30 to 100 mm3/g.
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公开(公告)号：US20180074426A1
公开(公告)日：2018-03-15
申请号：US15696698
申请日：2017-09-06
Applicant: POWDERTECH CO., LTD.
Inventor： Hiroki SAWAMOTO , Hajime AKIBA , Tetsuya UEMURA
CPC classification number: G03G9/1133 , G03G9/10 , G03G9/107 , G03G9/1075 , G03G9/1131 , G03G9/1132 , G03G9/1136
Abstract: An object of the present invention is to provide a carrier low in specific gravity and less in both environmental fluctuation and change of the charge amount after aging, an electrophotographic developer using the carrier, and a method of manufacturing the carrier. To achieve the object, the carrier is manufactured by coating a core material composed of a magnetic component and a non-magnetic component with a resin, and the carrier is characterized in that water content is 200 ppm or less and cyclic siloxane content is 100 ppb or less. Further, an electrophotographic developer containing the carrier is provided.
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