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公开(公告)号：US20240337960A1
公开(公告)日：2024-10-10
申请号：US18616695
申请日：2024-03-26
发明人： YUU NISHIMURA , KENTARO KAMAE , KENTA MITSUIKI , NOBUHIRO YOSHIDA , MAKI IMURA , KOHEI YOSHIYAMA , KAZUNARI OOYAMA , NOBUYOSHI SUGAHARA , YUYA CHIMOTO , TAKAHO SHIBATA
CPC分类号： G03G9/08755 , G03G9/107
摘要： A toner comprising: a toner particle comprising a binder resin, a release agent, and a graft polymer (A), wherein the binder resin comprises an amorphous polyester, the graft polymer (A) has two or more exothermic peaks measured by differential scanning calorimetric measurement, the release agent has at least one exothermic peak, and when, among exothermic peaks of the graft polymer (A), a peak temperature of a highest temperature-side exothermic peak is indicated by TMax (° C.), a peak temperature of a lowest temperature-side exothermic peak is indicated by TMin (° C.), and, among exothermic peaks of the release agent, a peak temperature of a maximum exothermic peak is indicated by TWax (° C.), TMax, TMin and TWax satisfy relationships of formulae (1) and (2) below:
5.
≤
T
Max
-
T
Min
≤
20.
,
and
(
1
)
10.
≤
T
Wax
-
T
Max
≤
40.
.
(
2
)-
公开(公告)号：US20230296999A1
公开(公告)日：2023-09-21
申请号：US18022961
申请日：2021-08-24
申请人： POWDERTECH CO.,LTD.
发明人： Makoto ISHIKAWA , Tetsuya UEMURA
IPC分类号： G03G9/107
CPC分类号： G03G9/1085
摘要： The present invention relates to a ferrite particle containing a crystal phase component containing a perovskite-type crystal represented by a composition formula of RZrO3 (wherein R is an alkaline earth metal element), and a Mg content of 0.45 mass % or less. The present invention also relates to a carrier core material for an electrophotographic developer, containing the ferrite particle; a carrier for an electrophotographic developer, containing the ferrite particle and a resin coating layer provided on a surface of the ferrite particle; and an electrophotographic developer containing the carrier for an electrophotographic developer and a toner.
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公开(公告)号：US20230288830A1
公开(公告)日：2023-09-14
申请号：US18161835
申请日：2023-01-30
发明人： Takeshi TANABE , Shintaro Anno , Yasuo Kadokura
CPC分类号： G03G9/1131 , G03G9/107
摘要： A method for producing a carrier for developing an electrostatic charge image, the method includes: adding a coating liquid containing a resin, conductive particles, and a solvent and magnetic particles to a mixer having a stirring blade, and mixing the coating liquid and the magnetic particles to obtain a mixture; and evaporating and drying the solvent from the mixture to produce a carrier having a resin coating layer on surfaces of the magnetic particles, wherein a viscosity μ of the coating liquid when being added to the mixer is more than 60 mPa·s and 1,000 mPa·s or less, and a value of a ratio μ/W of the viscosity μ(mPa·s) to an amount W (parts by mass) of the resin coating layer with respect to 100 parts by mass of the magnetic particles in the carrier is 20 or more and 500 or less.
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公开(公告)号：US20230273543A1
公开(公告)日：2023-08-31
申请号：US18173512
申请日：2023-02-23
发明人： MASATAKE TANAKA , SHINTARO KAWAGUCHI , TAIJI KATSURA , DAI NOZAKI
IPC分类号： G03G9/107
CPC分类号： G03G9/1087 , G03G9/08755
摘要： A toner comprising: a toner particle comprising a binder resin; and an external additive at the surface of the toner particle, wherein, in a wettability test of the toner in a mixed methanol/water solvent, the methanol concentration at which the transmittance of light having a wavelength of 780 nm is 50% is 5 to 35 vol %, the external additive comprises a fluorine-containing particle, and the fluorine-containing particle is at least one selected from the group consisting of a fluorine-containing titania particle, a fluorine-containing silica particle, a fluorine-containing alumina particle, a fluorine-containing titanium composite oxide particle and a fluorine-containing hydrotalcite particle.
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公开(公告)号：US11714362B2
公开(公告)日：2023-08-01
申请号：US17117444
申请日：2020-12-10
发明人： Ichiro Kanno , Takeshi Hashimoto , Kentaro Kamae , Hayato Ida
CPC分类号： G03G9/08755 , G03G9/0819 , G03G9/0823 , G03G9/08711 , G03G9/09708 , G03G9/09716 , G03G9/107
摘要： A toner having: a toner particle containing a binder resin including a first resin and a second resin; and an inorganic fine particle on a surface of the toner particle, wherein the first resin has a specific content ratio of a specific monomer unit, acid values of the first unit and second unit are within specific ranges, a domain matrix structure including a matrix containing the first resin and domains containing the second resin appears in cross-sectional observation of the toner, a compound having an alkyl group is present on a surface of the inorganic fine particle, and a volume resistivity of the inorganic fine particle is 1.0×105 Ω·cm to 1.0×1013 Ω·cm.
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公开(公告)号：US20220390874A1
公开(公告)日：2022-12-08
申请号：US17642156
申请日：2020-09-14
发明人： Yuto KAMAI , Shinya SASAKI , Yuki KANESHIRO
IPC分类号： G03G9/107
摘要： In a carrier core material according to the present invention, the volume moment mean D [4, 3] of O. Bluntness measured with an injection type image analysis particle size distribution meter is equal to or greater than 65% and equal to or less than 80%, and the volume moment mean D [4, 3] of ISO Roundness is equal to or greater than 80% and equal to or less than 86%. In this way, it is possible to suppress development memory and carrier adherence.
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公开(公告)号：US20220299906A1
公开(公告)日：2022-09-22
申请号：US17401981
申请日：2021-08-13
发明人： Yosuke TSURUMI , Sakiko TAKEUCHI , Karin SAKAI
摘要： An electrostatic charge image developing carrier, containing: a magnetic particle; and a resin coating layer that coats the magnetic particle and contains inorganic particles, and the electrostatic charge image developing carrier has a surface of a surface roughness satisfying a ratio B/A of a surface area B to a plan view area A of 1.020 or more and 1.100 or less, the plan view area A and the surface area B being obtained by three-dimensional analysis of the surface, and the magnetic particle has a surface roughness satisfying 0.5 μm≤Sm≤2.5 μm and 0.3 μm≤Ra≤1.2 μm, and Sm represents an average ruggedness interval and Ra represents an arithmetic average surface roughness.
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公开(公告)号：US20220236660A1
公开(公告)日：2022-07-28
申请号：US17581433
申请日：2022-01-21
IPC分类号： G03G9/113 , G03G9/107 , C08F299/08
摘要： A magnetic carrier including: a magnetic core; and a coating resin that coats a surface of the magnetic core, wherein the resin coating layer has a thickness of 50 nm or more, a coating resin, which forms the resin coating layer, contains a resin S having an organosilicon polymer moiety, and when a surface and a position at a depth of 20 nm from the surface of the magnetic carrier are analyzed by X-ray photoelectron spectroscopy, an amount of silicon element as determined by the analysis has a ratio within a specific range at respective positions.
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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
申请人： POWDERTECH CO.,LTD.
发明人： Aya SAKUTA , Makoto ISHIKAWA , Hiroki SAWAMOTO , Tetsuya UEMURA
摘要： 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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10.发明授权公开(公告)号：US11106150B2
公开(公告)日：2021-08-31
申请号：US16683534
申请日：2019-11-14
申请人： RICOH COMPANY, LTD.
摘要： A carrier for forming an electrophotographic image is provided. The carrier includes a core particle comprising a manganese-based ferrite particle having an apparent density of from 2.0 to 2.2 g/cm3 and a magnetization of from 44 to 52 emu/g in a magnetic field of 500 Oe; and a coating layer coating a surface of the core particle. The coating layer contains a carbon black, an inorganic particle A, and an inorganic particle B. The inorganic particle A and the carbon black each have a concentration gradient in a thickness direction of the coating layer. A concentration of the inorganic particle A increases toward a surface of the coating layer, and a concentration of the carbon black decreases toward the surface of the coating layer.
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