Patents by Inventor Yuto Onozaki
Yuto Onozaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20220236657Abstract: A magnetic carrier including a magnetic core and a coating resin configured to coat the surface of the magnetic core. The coating resin contains a graft resin A and a graft resin B. The coating resin (i) contains 1.0 mass % or more and 50.0 mass % or less of the graft resin A, and (ii) contains 50.0 mass % or more and 99.0 mass % or less of the graft resin B. The graft resin A has a unit Y1 represented by formula (1) and a unit Y2 represented by formula (2). The graft resin B (i) is a comb-shaped polymer having, as a branch, at least one moiety selected from, for example, a styrene-based polymer moiety and a (meth)acrylate-based polymer moiety, and (ii) contains the polysiloxane structure moiety at a content of 0.1 mass % or less.Type: ApplicationFiled: January 26, 2022Publication date: July 28, 2022Inventors: Yuto Onozaki, Ryuji Murayama, Nobuhiro Yoshida, Hironori Minagawa
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Publication number: 20220236660Abstract: 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.Type: ApplicationFiled: January 21, 2022Publication date: July 28, 2022Inventors: Ryuji Murayama, Hironori Minagawa, Yuto Onozaki, Nobuhiro Yoshida
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Publication number: 20220236658Abstract: A magnetic carrier includes a magnetic core and a coating resin that covers a surface of the magnetic core. The coating resin includes a resin A and a resin B. A content of the resin A is 1 to 50% by mass, and a content of the resin B is 50 to 99% by mass, with respect to the coating resin. The resin A has a particular unit Y1 and a particular unit Y2, and the resin B contains 0.1% by mass or less of the particular unit Y2. When a mass of the resin A is represented by X, a mass of the unit Y1 is represented by Ma, and a mass of the unit Y2 is represented by Mb, 0.90?(Ma+Mb)/X?1.00 and 1.00?Ma/Mb?30.0 are satisfied, and also 0?|SPa?SPb|?2.0 is satisfied.Type: ApplicationFiled: January 24, 2022Publication date: July 28, 2022Inventors: Ryuji Murayama, Yuto Onozaki, Nobuhiro Yoshida, Hironori Minagawa
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Publication number: 20210389688Abstract: A negative-charging toner comprising a toner particle comprising a binder resin and an organic-inorganic composite fine particle comprising resin fine particles and inorganic fine particles A, wherein the organic-inorganic composite fine particle is negative charging, the organic-inorganic composite fine particle has a structure in which at least a part of the inorganic fine particle A is embedded in the resin fine particle, a number average particle diameter Db of the organic-inorganic composite fine particle is 50 to 350 nm, and a plurality of convex portions derived from the inorganic fine particles A are present on the surface of the organic-inorganic composite fine particle.Type: ApplicationFiled: June 2, 2021Publication date: December 16, 2021Inventors: Takaho Shibata, Ryuji Murayama, Ryuichiro Matsuo, Yuto Onozaki, Kenta Mitsuiki, Megumi Shino, Hironori Minagawa
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Patent number: 11131939Abstract: A toner including a toner particle that contains a binder resin, and an inorganic fine particle, wherein the inorganic fine particle contains aggregated particles; the aggregated particles contain primary particles of at least one metal salt selected from the group consisting of titanate metal salts and zirconate metal salts; the primary particles have a number-average particle diameter of from 15 nm to 55 nm; the aggregated particles have an aggregation diameter of from 80 nm to 300 nm, the aggregated particles have a volume resistivity of from 2×109 ?·cm to 2×1013 ?·cm; and the aggregated particles cover a surface of the toner particle, and a coverage ratio of the aggregated particles with respect to the surface of the toner particle is from 0.3 area % to 10.0 area %.Type: GrantFiled: August 26, 2019Date of Patent: September 28, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Masayuki Hama, Yuto Onozaki, Takeshi Hashimoto, Megumi Shino, Ichiro Kanno, Nozomu Komatsu, Hiroyuki Fujikawa
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Patent number: 10955765Abstract: A magnetic carrier comprising a magnetic carrier particle having a magnetic carrier particle having a magnetic carrier core particle and a resin coat layer formed on the magnetic carrier core particle surface, and inorganic fine particles A present on a surface of the magnetic carrier particle, wherein each of the inorganic fine particles A has a rectangular parallelepiped particle shape, the inorganic fine particles A have D1 of 10 to 60 nm, the inorganic fine particles A are inorganic particles which have been surface treated with a surface treatment agent or silane coupling agent-treated particles, SP1 of the resin coat layer and SP2 of the surface treatment agent satisfies SP1?SP2?14.00, and the coverage ratio of the magnetic carrier surface by the inorganic fine particles A as measured by ESCA is 5.0 to 20.0 atom %: and a two-component developer comprising at least the magnetic carrier and a toner.Type: GrantFiled: November 18, 2019Date of Patent: March 23, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Yuto Onozaki, Ichiro Kanno, Ryo Nakajima, Kazuyuki Sakamoto, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa
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Patent number: 10935902Abstract: A toner including a toner particle that includes a binder resin and a crystalline polyester; and inorganic fine particles on the toner particle surface, wherein a content of the crystalline polyester is 0.5 to 20.0 mass parts per 100 mass parts of the binder resin; in the toner cross section, domains of the crystalline polyester are present in a dispersed state, the percentage for areas of these crystalline polyester domains in the region to a depth of 0.50 ?m from a contour of the toner particle is at least 10%, the number average of lengths of a major axis is 120 nm to 1000 nm, and the number average of aspect ratios is not more than 4; a dielectric constant of the inorganic fine particles is 25 to 300 pF/m; and a coverage ratio by the inorganic fine particles on the toner particle surface is 5% to 60%.Type: GrantFiled: December 3, 2019Date of Patent: March 2, 2021Assignee: Canon Kabushiki KaishaInventors: Ichiro Kanno, Nozomu Komatsu, Yuto Onozaki, Takakuni Kobori, Kazuyuki Sakamoto, Ryo Nakajima, Hiroyuki Fujikawa
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Publication number: 20200183295Abstract: A toner including a toner particle that includes a binder resin and a crystalline polyester; and inorganic fine particles on the toner particle surface, wherein a content of the crystalline polyester is 0.5 to 20.0 mass parts per 100 mass parts of the binder resin; in the toner cross section, domains of the crystalline polyester are present in a dispersed state, the percentage for areas of these crystalline polyester domains in the region to a depth of 0.50 ?m from a contour of the toner particle is at least 10%, the number average of lengths of a major axis is 120 nm to 1000 nm, and the number average of aspect ratios is not more than 4; a dielectric constant of the inorganic fine particles is 25 to 300 pF/m; and a coverage ratio by the inorganic fine particles on the toner particle surface is 5% to 60%.Type: ApplicationFiled: December 3, 2019Publication date: June 11, 2020Inventors: Ichiro Kanno, Nozomu Komatsu, Yuto Onozaki, Takakuni Kobori, Kazuyuki Sakamoto, Ryo Nakajima, Hiroyuki Fujikawa
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Publication number: 20200166862Abstract: A magnetic carrier comprising a magnetic carrier particle having a magnetic carrier particle having a magnetic carrier core particle and a resin coat layer formed on the magnetic carrier core particle surface, and inorganic fine particles A present on a surface of the magnetic carrier particle, wherein each of the inorganic fine particles A has a rectangular parallelepiped particle shape, the inorganic fine particles A have D1 of 10 to 60 nm, the inorganic fine particles A are inorganic particles which have been surface treated with a surface treatment agent or silane coupling agent-treated particles, SP1 of the resin coat layer and SP2 of the surface treatment agent satisfies SP1?SP2?14.00, and the coverage ratio of the magnetic carrier surface by the inorganic fine particles A as measured by ESCA is 5.0 to 20.0 atom %: and a two-component developer comprising at least the magnetic carrier and a toner.Type: ApplicationFiled: November 18, 2019Publication date: May 28, 2020Inventors: Yuto Onozaki, Ichiro Kanno, Ryo Nakajima, Kazuyuki Sakamoto, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa
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Patent number: 10620556Abstract: A toner having chargeability and fluidity that do not change to a great extent is provided. The toner includes toner particles containing a binder resin and includes inorganic fine particles A, wherein the shape factor SF-2 of primary particles of the inorganic fine particles A is 116 or less, and regarding the particle size distribution on a volume basis of the inorganic fine particles A on the toner particle surfaces, the particle diameter when a cumulative value from the small particle side reaches 16% by volume is denoted as D16, the particle diameter when a cumulative value reaches 50% by volume is denoted as D50, and the particle diameter when a cumulative value reaches 84% by volume is denoted as D84, D50 is 80 nm or more and 200 nm or less, and the particle size distribution indicator A represented by D84/D16 is 1.70 or more and 2.60 or less.Type: GrantFiled: December 4, 2018Date of Patent: April 14, 2020Assignee: Canon Kabushiki KaishaInventors: Nozomu Komatsu, Masayuki Hama, Takeshi Hashimoto, Ichiro Kanno, Yuto Onozaki, Megumi Ikeda, Akifumi Matsubara, Hitoshi Sano, Takakuni Kobori, Hiroyuki Fujikawa
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Patent number: 10599060Abstract: A toner including: a toner particle, wherein the toner particle contains a binder resin, a compound represented by formula (1) below, and a compound in which at least a compound represented by formula (2) below and a compound represented by formula (3) below are in solid solution. In formula (1), R1, R2, R3, and R6 each independently represent an alkyl group or aryl group, and R4 and R5 each independently represent an aryl group, acyl group, or alkyl group, or R4 is bonded to R5 to form a cyclic organic functional group that contains R4, R5, and the nitrogen atom to which R4 and R5 are bonded.Type: GrantFiled: November 30, 2018Date of Patent: March 24, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Ichiro Kanno, Takeshi Hashimoto, Nozomu Komatsu, Masayuki Hama, Yuto Onozaki, Megumi Ikeda, Hiroyuki Fujikawa
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Publication number: 20200073263Abstract: A toner including a toner particle that contains a binder resin, and an inorganic fine particle, wherein the inorganic fine particle contains aggregated particles; the aggregated particles contain primary particles of at least one metal salt selected from the group consisting of titanate metal salts and zirconate metal salts; the primary particles have a number-average particle diameter of from 15 nm to 55 nm; the aggregated particles have an aggregation diameter of from 80 nm to 300 nm, the aggregated particles have a volume resistivity of from 2×109 ?·cm to 2×1013 ?·cm; and the aggregated particles cover a surface of the toner particle, and a coverage ratio of the aggregated particles with respect to the surface of the toner particle is from 0.3 area % to 10.0 area %.Type: ApplicationFiled: August 26, 2019Publication date: March 5, 2020Inventors: Masayuki Hama, Yuto Onozaki, Takeshi Hashimoto, Megumi Shino, Ichiro Kanno, Nozomu Komatsu, Hiroyuki Fujikawa
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Patent number: 10564560Abstract: Provided is a toner having a toner particle, wherein the toner particle contains a polyester resin and a fatty acid metal salt, the toner contains a tetrahydrofuran-soluble component A with a molecular weight of at least 1,000 and not more than 5,000, as measured by gel permeation chromatography, in an amount of at least 25 mass % and not more than 80 mass %, and a mass ratio of the fatty acid metal salt to the tetrahydrofuran-soluble component A is at least 0.003 and not more than 0.060.Type: GrantFiled: June 4, 2018Date of Patent: February 18, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Yuto Onozaki, Takeshi Hashimoto, Ichiro Kanno, Masayuki Hama, Nozomu Komatsu, Hiroyuki Fujikawa
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Patent number: 10474049Abstract: By controlling the migration to the toner particle surface of the crystalline polyester present in the toner particle, a toner is provided that exhibits an excellent durability in long-term use, a stable charging performance after holding in a high-temperature, high-humidity environment, and an excellent low-temperature fixability, in which the toner having a toner particle that contains an amorphous resin, a crystalline polyester, and a wax, wherein the toner particle includes, at the surface thereof, a coat layer containing a cyclic polyolefin resin.Type: GrantFiled: March 20, 2019Date of Patent: November 12, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Yuto Onozaki, Masayuki Hama, Takeshi Hashimoto, Ichiro Kanno, Hitoshi Sano, Akifumi Matsubara, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa, Tsubasa Fujisaki
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Patent number: 10451986Abstract: According to the present invention, in a toner including a toner particle containing a binder resin and a low molecular aromatic hydrocarbon, the binder resin contains a polyester resin, at least one kind of a unit derived from an aromatic monocarboxylic acid and a unit derived from an aromatic monoalcohol is contained, and the low molecular aromatic hydrocarbon has 1 or more and 4 or less benzene rings, and has a melting point of 60° C. or more and 120° C. or less.Type: GrantFiled: March 6, 2018Date of Patent: October 22, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Hitoshi Sano, Takeshi Hashimoto, Masayuki Hama, Ichiro Kanno, Yuto Onozaki, Akifumi Matsubara, Megumi Ikeda, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa
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Patent number: 10423086Abstract: Provided is a toner containing: a toner particle containing a binder resin; and an inorganic particle, wherein the inorganic particle contains a silicon oxide particle with a number-average particle diameter (D1) from 50 nm to 300 nm and a strontium titanate particle with a number-average particle diameter (D1) from 10 nm to 60 nm, the content of the silicon oxide particle is from 0.5 to 15.0 mass parts per 100 mass parts of the toner particle, the content of the strontium titanate particle is from 0.02 to 5.00 times the content of the silicon oxide particle, and in dielectric constant measurement at 25° C. and 1 MHz, the dielectric constant of the silicon oxide particle is from 1.0 pF/m to 20.0 pF/m, and the dielectric constant of the strontium titanate is from 25.0 pF/m to 100.0 pF/m.Type: GrantFiled: May 30, 2018Date of Patent: September 24, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Masayuki Hama, Takeshi Hashimoto, Yuto Onozaki, Ichiro Kanno, Nozomu Komatsu, Hiroyuki Fujikawa
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Patent number: 10401748Abstract: A toner comprises a toner particle containing an amorphous polyester, wherein the amorphous polyester contains an amorphous polyester 1, the amorphous polyester contains a tin compound and a titanium compound, a Sn/Ti abundance ratio between Sn and Ti in the amorphous polyester according to x-ray fluorescence analysis is 20/80 to 80/20, and a weight-average molecular weight Mw1 of the amorphous polyester 1 according to measurement by gel permeation chromatography (GPC) is Mw1<7,000.Type: GrantFiled: May 22, 2017Date of Patent: September 3, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Hashimoto, Nozomu Komatsu, Yuto Onozaki, Akifumi Matsubara, Ichiro Kanno, Hitoshi Sano, Tsubasa Fujisaki, Masayuki Hama, Takakuni Kobori, Hiroyuki Fujikawa
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Publication number: 20190219939Abstract: By controlling the migration to the toner particle surface of the crystalline polyester present in the toner particle, a toner is provided that exhibits an excellent durability in long-term use, a stable charging performance after holding in a high-temperature, high-humidity environment, and an excellent low-temperature fixability, in which the toner having a toner particle that contains an amorphous resin, a crystalline polyester, and a wax, wherein the toner particle includes, at the surface thereof, a coat layer containing a cyclic polyolefin resin.Type: ApplicationFiled: March 20, 2019Publication date: July 18, 2019Inventors: Yuto Onozaki, Masayuki Hama, Takeshi Hashimoto, Ichiro Kanno, Hitoshi Sano, Akifumi Matsubara, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa, Tsubasa Fujisaki
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Publication number: 20190171125Abstract: A toner including: a toner particle, wherein the toner particle contains a binder resin, a compound represented by formula (1) below, and a compound in which at least a compound represented by formula (2) below and a compound represented by formula (3) below are in solid solution. In formula (1), R1, R2, R3, and R6 each independently represent an alkyl group or aryl group, and R4 and R5 each independently represent an aryl group, acyl group, or alkyl group, or R4 is bonded to R5 to form a cyclic organic functional group that contains R4, R5, and the nitrogen atom to which R4 and R5 are bonded.Type: ApplicationFiled: November 30, 2018Publication date: June 6, 2019Inventors: Ichiro Kanno, Takeshi Hashimoto, Nozomu Komatsu, Masayuki Hama, Yuto Onozaki, Megumi Ikeda, Hiroyuki Fujikawa
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Patent number: 10274851Abstract: A toner is provided, which contains a toner particle and a metal titanate particle, wherein, in a number-based particle size distribution of the metal titanate particle on the surface of the toner particle, when D10, D50 and D90 denote the particle diameter at which the cumulative value from the small particle diameter side reaches 10% by number, 50% by number and 90% by number, respectively, the D50 is at least 10 nm and not more than 90 nm, and the particle size distribution index A, which is represented by D90/D10, is at least 2.00 and not more than 10.00, and the value of storage elastic modulus G? at 40° C. in viscoelasticity measurements of the toner is at least 1.0×107 Pa and not more than 1.0×1010 Pa.Type: GrantFiled: February 2, 2018Date of Patent: April 30, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Hashimoto, Masayuki Hama, Yuto Onozaki, Ichiro Kanno, Nozomu Komatsu, Hiroyuki Fujikawa