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公开(公告)号：US20240329555A1
公开(公告)日：2024-10-03
申请号：US18576627
申请日：2022-03-31
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Kohei TERASAKI , Yuma UCHIHASHI , Yusuke KURANO
CPC classification number: G03G9/1139 , G03G9/1075 , G03G9/1131 , G03G9/1136
Abstract: In a two-component developer, external additive particles of toner particles include silica particles. The silica particles have a number average primary particle diameter of at least 30 nm and no greater than 120 nm. Coat layers of carrier particles contain a coating resin and barium titanate particles. The coating resin includes a silicone resin. The barium titanate particles have a number average primary particle diameter of at least 100 and no greater than 500 nm. The barium titanate particles have a content of at least 5 parts by mass and no greater than 45 parts by mass relative to 100 parts by mass of the coating resin. A rate of a mass of the coat layers to a mass of the carrier cores is at least 0.09% by mass and no greater than 4.90% by mass. A coverage rate of the carrier cores is at least 80.0% and less than 100.0%.
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Patent Agency Ranking
公开(公告)号：US20210263438A1
公开(公告)日：2021-08-26
申请号：US17175766
申请日：2021-02-15
Applicant: KYOCERA Document Solutions Inc.
Inventor： Yuma UCHIHASHI
Abstract: A carrier for a developer includes carrier particles. The carrier particles have a sea island structure including a sea portion and an island portion on the surface. The island portion contains a nitrogen-containing silicone resin. The sea portion contains a nitrogen-free silicone resin. The area ratio of the island portion in the total area of the surface of the carrier particle is 20% or more and 40% or less.
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公开(公告)号：US20240184227A1
公开(公告)日：2024-06-06
申请号：US18576301
申请日：2022-03-31
Applicant: KYOCERA Document Solutions Inc.
Inventor： Kohei TERASAKI , Tamotsu SHIMIZU , Yusuke KURANO , Masashi YAMASHITA , Yuma UCHIHASHI
CPC classification number: G03G9/1139 , G03G9/0819 , G03G9/09708 , G03G9/1135
Abstract: In a two-component developer, toner particles include toner mother particles and external additive particles including strontium titanate particles. A first percentage content being a percentage content of the strontium titanate particles to the mass of the toner mother particles is 0.30-0.90% by mass. The carrier particles include carrier cores and coat layers. The coat layers contain barium titanate particles and a coating resin including a silicone resin. The barium titanate particles have a number average primary particle diameter of 100-500 nm. A second percentage content being a percentage content of the coat layers to the mass of the carrier cores is 2.0-4.0% by mass. A third percentage content being a percentage content of the barium titanate to the mass of the coating resin satisfies formula (1) “(X×10)≤Z≤45.0”. In formula (1), X represents the first percentage content and Z represents the third percentage content.
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公开(公告)号：US20180284630A1
公开(公告)日：2018-10-04
申请号：US15933661
申请日：2018-03-23
Applicant: KYOCERA Document Solutions Inc.
Inventor： Yuma UCHIHASHI
CPC classification number: G03G9/0819 , G03G9/0825 , G03G15/0865
Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes a plurality of resin particles each containing first temperature responsive polymer domains and second temperature responsive polymer domains. The second temperature responsive polymer domains have a lower critical solution temperature (LCST) higher than that of the first temperature responsive polymer domains.
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公开(公告)号：US20240241461A1
公开(公告)日：2024-07-18
申请号：US18575982
申请日：2022-03-31
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tamotsu SHIMIZU , Kohei TERASAKI , Yuma UCHIHASHI , Eriko TAKEUCHI
CPC classification number: G03G9/1136 , G03G9/0819 , G03G9/09733 , G03G9/1139
Abstract: In a two-component developer, external additive particles of toner particles include resin particles containing a thermoplastic resin. Coat layers of carrier particles contain a coating resin and barium titanate particles. The coating resin includes a silicone resin. The barium titanate particles have a number average primary particle diameter of 100-500 nm. The barium titanate particles have a content of 4-45 parts by mass relative to 100 parts by mass of the coating resin. The rate of the mass of the coat layers to the mass of the carrier cores is 0.10-4.90% by mass. The average of coverage rates of the carrier cores is at least 80.0% and less than 100.0%.
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公开(公告)号：US20190324377A1
公开(公告)日：2019-10-24
申请号：US16381175
申请日：2019-04-11
Applicant: KYOCERA Document Solutions Inc.
Inventor： Yuma UCHIHASHI
Abstract: A toner includes toner particles. The toner particles each include a toner core containing a binder resin and a shell layer covering a surface of the toner core. The shell layers contain a branched macromolecule. The branched macromolecule includes a repeating unit having an oxazoline group. The branched macromolecule satisfies a relationship represented by rB/rL≤0.80, where rB represents a radius of gyration of the branched macromolecule when an absolute molecular weight of the branched macromolecule is 40,000, and rL represents a radius of gyration of a linear macromolecule including a main chain having the same structure as a main chain of the branched macromolecule when an absolute molecular weight of the linear macromolecule is 40,000. rB and rL are each a radius of gyration measured by gel permeation chromatography using a multi-angle laser light scattering detector.
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