Patents by Inventor Takeo Mizobe
Takeo Mizobe 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: 20240142888Abstract: A toner includes toner particles each including a toner mother particle and external additive particles attached to the surface of the toner mother particle. The external additive particles include fluororesin particles, specific external additive particles, and silica particles. The specific external additive particles contain barium titanate or strontium titanate. The silica particles have a detachment fraction of at least 5% by mass and no greater than 22% by mass. The detachment fraction of the silica particles is a percentage of a mass M2 of silica particles of the silica particles that have separated from the toner mother particles after ultrasonication to a mass M1 of the silica particles included in the toner particles before the ultrasonication. The ultrasonication is application of ultrasonic vibration to a mixed liquid of 5 g of the toner and 105.5 g of a nonionic surfactant-containing aqueous solution containing 0.55 g of a nonionic surfactant.Type: ApplicationFiled: October 30, 2023Publication date: May 2, 2024Applicant: KYOCERA Document Solutions Inc.Inventor: Takeo MIZOBE
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Patent number: 11880163Abstract: A toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive includes specific external additive particles. The specific external additive particles have a number average primary particle diameter of at least 30 nm and no greater than 305 nm. The specific external additive particles include antimony-doped tin oxide particles or indium tin oxide particles. A ratio (MSb/(MSn+MSb)) of a mass (MSb) of an antimony atom to a total of the mass (MSb) of the antimony atom and a mass (MSn) of a tin atom in the antimony-doped tin oxide particles is at least 0.04 and no greater than 0.46.Type: GrantFiled: October 13, 2021Date of Patent: January 23, 2024Assignee: KYOCERA Document Solutions Inc.Inventors: Ryota Kobayashi, Naruo Yabe, Takeshi Arakawa, Takeo Mizobe, Masanori Sugahara
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Publication number: 20230049150Abstract: An image forming apparatus forms an image on a recording medium using first to fourth toners, and includes an intermediate transfer target; a primary transfer unit that transfers a first toner image, a second toner image, a third toner image, and a fourth toner image to the intermediate transfer target in stated order; and a secondary transfer unit that collectively transfers the first to fourth toner images onto the recording medium. The first toner image, the second toner image, the third toner image, and the fourth toner image include the first toner, the second toner, the third toner, and the fourth toner, respectively. The first to fourth toners each include toner particles. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive includes fluororesin particles and silica particles.Type: ApplicationFiled: July 28, 2022Publication date: February 16, 2023Applicant: KYOCERA Document Solutions Inc.Inventor: Takeo MIZOBE
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Publication number: 20220163901Abstract: A toner includes toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive includes fluorine-containing particles. The fluorine-containing particles include a fluorine atom at least in surface layers thereof. The amount of the fluorine-containing particles is at least 0.10 parts by mass and no greater than 0.50 parts by mass relative to 100 parts by mass of the toner mother particles. When ultrasonication is performed, a residual amount ratio of remaining fluorine-containing particles is at least 0% by mass and no greater than 20% by mass relative to the amount of the fluorine-containing particles attached to the toner mother particles before the ultrasonication.Type: ApplicationFiled: November 23, 2021Publication date: May 26, 2022Applicant: KYOCERA Document Solutions Inc.Inventors: Masanori SUGAHARA, Naruo YABE, Takeshi ARAKAWA, Takeo MIZOBE, Ryota KOBAYASHI
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Publication number: 20220113644Abstract: A toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to the surface of the toner mother particle. The external additive includes specific external additive particles. The specific external additive particles have a number average primary particle diameter of at least 30 nm and no greater than 305 nm. The specific external additive particles include antimony-doped tin oxide particles or indium tin oxide particles. A ratio (MSb/(MSn+MSb)) of a mass (MSb) of an antimony atom to a total of the mass (MSb) of the antimony atom and a mass (MSn) of a tin atom in the antimony-doped tin oxide particles is at least 4% by mass and no greater than 46% by mass.Type: ApplicationFiled: October 13, 2021Publication date: April 14, 2022Applicant: KYOCERA Document Solutions Inc.Inventors: Ryota KOBAYASHI, Naruo YABE, Takeshi ARAKAWA, Takeo MIZOBE, Masanori SUGAHARA
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Publication number: 20220035263Abstract: A toner includes toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive includes fluororesin particles. The fluororesin particles have a number average primary particle diameter of at least 100 nm and no greater than 300 nm. An area ratio of a region of the surface of the toner mother particle that is covered with the fluororesin particles is at least 0.70% and no greater than 2.20% in the surface of the toner mother particle.Type: ApplicationFiled: July 29, 2021Publication date: February 3, 2022Applicant: KYOCERA Document Solutions Inc.Inventors: Takeo MIZOBE, Naruo YABE, Takeshi ARAKAWA, Masanori SUGAHARA, Ryota KOBAYASHI
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Patent number: 11092907Abstract: A toner contains toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive contains titanate compound particles doped with lanthanum and a group 5 element in the periodic table as external additive particles. The amount of the lanthanum is at least 1.50% by mass relative to the total mass of the titanate compound particles. The amount of the group 5 element in the periodic table is at least 0.01% by mass and no greater than 0.60% by mass relative to the total mass of the titanate compound particles.Type: GrantFiled: April 16, 2020Date of Patent: August 17, 2021Assignee: KYOCERA Document Solutions Inc.Inventors: Takeo Mizobe, Takeshi Arakawa, Masanori Sugahara, Ryota Kobayashi, Kazuki Ono, Naruo Yabe
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Publication number: 20200341399Abstract: A toner contains toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive contains titanate compound particles doped with lanthanum and a group 5 element in the periodic table as external additive particles. The amount of the lanthanum is at least 1.50% by mass relative to the total mass of the titanate compound particles. The amount of the group 5 element in the periodic table is at least 0.01% by mass and no greater than 0.60% by mass relative to the total mass of the titanate compound particles.Type: ApplicationFiled: April 16, 2020Publication date: October 29, 2020Applicant: KYOCERA Document Solutions Inc.Inventors: Takeo MIZOBE, Takeshi ARAKAWA, Masanori SUGAHARA, Ryota KOBAYASHI, Kazuki ONO, Naruo YABE
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Patent number: 9335648Abstract: An electrostatic latent image developing toner of the present disclosure contains a toner particle including a toner core containing a binder resin, and a shell layer coating a surface of the toner core. The shell layer is constituted by a resin containing a thermosetting resin. A zeta potential of the toner core measured in an aqueous medium adjusted to pH 4 is negative, and a zeta potential of the toner particle measured in an aqueous medium adjusted to pH 4 is positive. A pH at which the zeta potential of the toner particle measured in an aqueous medium is zero is 4.5 or higher and 7.0 or lower.Type: GrantFiled: July 28, 2014Date of Patent: May 10, 2016Assignee: KYOCERA Document Solutions Inc.Inventor: Takeo Mizobe
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Patent number: 8999619Abstract: A toner for electrostatic latent image development is comprised toner particles containing toner core particle containing at least a binder resin and a shell layer coating the toner core particle. The shell layer is smoothened to a predetermined level. The average particle diameter of the resin fine particles is from 45 nm to 300 nm. And, when cross-sections of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observable inside the shell layer.Type: GrantFiled: July 24, 2013Date of Patent: April 7, 2015Assignee: KYOCERA Document Solutions Inc.Inventors: Hiroaki Moriyama, Yukinori Nakayama, Takeo Mizobe, Takanori Tanaka, Hiroki Uemura
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Patent number: 8999620Abstract: A toner for electrostatic latent image development, containing toner particles composed of toner core particle containing at least a binder resin and a shell layer coating the toner core particle. Average circularities D4 to D7 of toner particles within predetermined particle diameter ranges are each no less than 0.960, the difference (Dmax?Dmin) between a maximum value Dmax among D4 to D7 and a minimum value Dmin among D4 to D7 is no greater than 0.015. The shell layer is smoothened to a predetermined level. And, cracks in a direction approximately perpendicular to a surface of the toner core particles are observable inside the shell layer when cross-section of the toner particle is observed using a transmission electron microscope.Type: GrantFiled: July 30, 2013Date of Patent: April 7, 2015Assignee: KYOCERA Document Solutions Inc.Inventors: Takanori Tanaka, Yukinori Nakayama, Hiroaki Moriyama, Takeo Mizobe, Hiroki Uemura
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Patent number: 8980514Abstract: A toner for electrostatic latent image development is comprised toner particles containing toner core particle containing at least a binder resin and a shell layer coating the toner core particle. The shell layer is smoothened to a predetermined level. And, when cross-sections of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observable inside the shell layer.Type: GrantFiled: July 24, 2013Date of Patent: March 17, 2015Assignee: KYOCERA Document Solutions Inc.Inventors: Yukinori Nakayama, Hiroaki Moriyama, Takeo Mizobe, Takanori Tanaka, Hiroki Uemura
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Patent number: 8980515Abstract: A magnetic toner for electrostatic latent image development includes toner particles containing toner core particle containing at least a binder resin and a magnetic powder, and a shell layer coating the toner core particle. In the toner, in the case where the surfaces of the shell layers are observed using a scanning electron microscope, the magnetic powder is not observed, and approximately spherical particles derived from the resin fine particles are not observed on the surfaces of the shell layers for toner particles having a particle diameter in a specific range. In the toner, in the case where the cross-sectional surfaces of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observed inside the shell layers.Type: GrantFiled: August 8, 2013Date of Patent: March 17, 2015Assignee: KYOCERA Document Solutions Inc.Inventors: Takeo Mizobe, Yukinori Nakayama, Hiroaki Moriyama, Takanori Tanaka, Hiroki Uemura
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Publication number: 20150037724Abstract: An electrostatic latent image developing toner of the present disclosure contains a toner particle including a toner core containing a binder resin, and a shell layer coating a surface of the toner core. The shell layer is constituted by a resin containing a thermosetting resin. A zeta potential of the toner core measured in an aqueous medium adjusted to pH 4 is negative, and a zeta potential of the toner particle measured in an aqueous medium adjusted to pH 4 is positive. A pH at which the zeta potential of the toner particle measured in an aqueous medium is zero is 4.5 or higher and 7.0 or lower.Type: ApplicationFiled: July 28, 2014Publication date: February 5, 2015Applicant: KYOCERA Document Solutions Inc.Inventor: Takeo MIZOBE
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Publication number: 20140045114Abstract: A magnetic toner for electrostatic latent image development includes toner particles containing toner core particle containing at least a binder resin and a magnetic powder, and a shell layer coating the toner core particle. In the toner, in the case where the surfaces of the shell layers are observed using a scanning electron microscope, the magnetic powder is not observed, and approximately spherical particles derived from the resin fine particles are not observed on the surfaces of the shell layers for toner particles having a particle diameter in a specific range. In the toner, in the case where the cross-sectional surfaces of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observed inside the shell layers.Type: ApplicationFiled: August 8, 2013Publication date: February 13, 2014Applicant: KYOCERA Document Solutions Inc.Inventors: Takeo Mizobe, Yukinori Nakayama, Hiroaki Moriyama, Takanori Tanaka, Hiroki Uemura
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Publication number: 20140038097Abstract: A toner for electrostatic latent image development, containing toner particles composed of toner core particle containing at least a binder resin and a shell layer coating the toner core particle. Average circularities D4 to D7 of toner particles within predetermined particle diameter ranges are each no less than 0.960, the difference (Dmax?Dmin) between a maximum value Dmax among D4 to D7 and a minimum value Dmin among D4 to D7 is no greater than 0.015. The shell layer is smoothened to a predetermined level. And, cracks in a direction approximately perpendicular to a surface of the toner core particles are observable inside the shell layer when cross-section of the toner particle is observed using a transmission electron microscope.Type: ApplicationFiled: July 30, 2013Publication date: February 6, 2014Applicant: KYOCERA Document Solutions Inc.Inventors: Takanori Tanaka, Yukinori Nakayama, Hiroaki Moriyama, Takeo Mizobe, Hiroki Uemura
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Publication number: 20140030649Abstract: A toner for electrostatic latent image development is comprised toner particles containing toner core particle containing at least a binder resin and a shell layer coating the toner core particle. The shell layer is smoothened to a predetermined level. And, when cross-sections of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observable inside the shell layer.Type: ApplicationFiled: July 24, 2013Publication date: January 30, 2014Applicant: KYOCERA Document Solutions Inc.Inventors: Yukinori Nakayama, Hiroaki Moriyama, Takeo Mizobe, Takanori Tanaka, Hiroki Uemura
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Publication number: 20140030647Abstract: A toner for electrostatic latent image development is comprised toner particles containing toner core particle containing at least a binder resin and a shell layer coating the toner core particle. The shell layer is smoothened to a predetermined level. The average particle diameter of the resin fine particles is from 45 nm to 300 nm. And, when cross-sections of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observable inside the shell layer.Type: ApplicationFiled: July 24, 2013Publication date: January 30, 2014Applicant: KYOCERA Document Solutions Inc.Inventors: Hiroaki Moriyama, Yukinori Nakayama, Takeo Mizobe, Takanori Tanaka, Hiroki Uemura
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Patent number: 8389186Abstract: A toner set is composed of toners of a plurality of colors that are used in a tandem-type color image forming apparatus. Each of the toners of a plurality of colors includes toner base particles and an external additive. The external additive includes small-diameter silica particles and large-diameter silica particles larger than the small-diameter silica particles. When, of the toners of a plurality of colors, three color toners to be used consecutively for forming the toner image are defined as a first toner, second toner and third toner respectively in order of usage thereof, the average particle diameter of the large-diameter silica particles contained in the second toner is smaller than the average particle diameter of the large-diameter silica particles contained in the first toner and is larger than the average particle diameter of the large-diameter silica particles contained in the third toner.Type: GrantFiled: October 21, 2010Date of Patent: March 5, 2013Assignee: Kyocera Mita CorporationInventor: Takeo Mizobe
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Publication number: 20110097656Abstract: A toner set is composed of toners of a plurality of colors that are used in a tandem-type color image forming apparatus. Each of the toners of a plurality of colors includes toner base particles and an external additive. The external additive includes small-diameter silica particles and large-diameter silica particles larger than the small-diameter silica particles. When, of the toners of a plurality of colors, three color toners to be used consecutively for forming the toner image are defined as a first toner, second toner and third toner respectively in order of usage thereof, the average particle diameter of the large-diameter silica particles contained in the second toner is smaller than the average particle diameter of the large-diameter silica particles contained in the first toner and is larger than the average particle diameter of the large-diameter silica particles contained in the third toner.Type: ApplicationFiled: October 21, 2010Publication date: April 28, 2011Applicant: KYOCERA MITA CORPORATIONInventor: Takeo Mizobe