Patents by Inventor Fumiya Hatakeyama
Fumiya Hatakeyama 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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Patent number: 10895815Abstract: A toner including: a toner particle including a toner base particle containing a binder resin, and an organosilicon condensate present on a surface of the toner base particle, wherein a charge attenuation constant of the toner is 3.5×10?3 or more to 1.0×100 or less.Type: GrantFiled: May 21, 2019Date of Patent: January 19, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Kenta Kamikura, Kunihiko Nakamura, Maho Tanaka, Fumiya Hatakeyama
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Patent number: 10551758Abstract: Provided is a toner, including a toner particle having: a toner base particle containing a binder resin and a colorant; and protrusion derived from a resin fine particle in a surface of the toner base particle, wherein the protrusion is covered with a condensation product of an organosilicon compound represented by the formula (1), and wherein the resin fine particle is in direct contact with the toner base particle.Type: GrantFiled: May 9, 2018Date of Patent: February 4, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Maho Tanaka, Kunihiko Nakamura, Kenta Kamikura, Fumiya Hatakeyama, Akane Masumoto
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Publication number: 20190271926Abstract: A toner including: a toner particle including a toner base particle containing a binder resin, and an organosilicon condensate present on a surface of the toner base particle, wherein a charge attenuation constant of the toner is 3.5×10?3 or more to 1.0×100 or less.Type: ApplicationFiled: May 21, 2019Publication date: September 5, 2019Inventors: Kenta Kamikura, Kunihiko Nakamura, Maho Tanaka, Fumiya Hatakeyama
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Patent number: 10401750Abstract: Provided is a toner comprising a toner particle including a toner base particle and fine particles present on a surface of the toner base particle, wherein each of the fine particles includes a core fine particle and a condensate of at least one organosilicon compound selected from the group consisting of organosilicon compounds represented by specific structural formulas, the condensate coating the surface of the core fine particle, and in a wettability test of the toner with respect to a methanol/water mixed solvent, a methanol concentration, when a transmittance of light having a wavelength of 780 nm is 50%, is 5.0 to 20.0% by volume: in above Formulas, each of Ra, Rb and Rc independently represents an alkyl group, an alkenyl group, an acetoxy group, an acyl group, an aryl group, or a methacryloxyalkyl group, R1 to R5 each independently represents a halogen atom or an alkoxy group.Type: GrantFiled: May 9, 2018Date of Patent: September 3, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Kunihiko Nakamura, Kenta Kamikura, Maho Tanaka, Fumiya Hatakeyama
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Patent number: 10353308Abstract: Provided is a toner, including a toner particle containing a toner base particle and a fine particle, wherein the fine particle includes a composite particle each having a surface covered with a condensation product of at least one kind of organosilicon compound selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (2), wherein the fine particle is stuck in a state of being embedded in a surface of the toner base particle, and wherein a coverage of a composition containing the organosilicon compound with respect to the surface of the toner base particle excluding the fine particle is 0.1% by area or more and 40.Type: GrantFiled: May 9, 2018Date of Patent: July 16, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Fumiya Hatakeyama, Kunihiko Nakamura, Kenta Kamikura, Maho Tanaka
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Patent number: 10345726Abstract: There is provided a method of manufacturing a toner including a toner particle containing a binder resin, the method including: process 1: preparing a mixed solution including the following components i) to iii) in an aqueous medium: i) a particular silicon compound, ii) a fine particle having a number average particle diameter of 3 nm or more and 500 nm or less, and iii) a toner base particle containing the binder resin; and process 2: adjusting a pH of the mixed solution to 7.0 or more and 12.0 or less to condense the silicon compound, wherein the fine particle has an absolute value of zeta potential of 10.0 mV or more at the pH of the mixed solution of process 1.Type: GrantFiled: May 9, 2018Date of Patent: July 9, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Kunihiko Nakamura, Kenta Kamikura, Maho Tanaka, Fumiya Hatakeyama
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Patent number: 10338487Abstract: A toner including: a toner particle including a toner base particle containing a binder resin, and an organosilicon condensate present on a surface of the toner base particle, wherein a charge attenuation constant of the toner is 3.5×10?3 or more to 1.0×100 or less.Type: GrantFiled: May 8, 2018Date of Patent: July 2, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Kenta Kamikura, Kunihiko Nakamura, Maho Tanaka, Fumiya Hatakeyama
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Patent number: 10310396Abstract: A first aspect is a toner production method in which an organosilicon compound is condensed in a surfactant-containing aqueous medium with a specific surface tension, in which a resin particle is dispersed, to produce a toner having the condensate of the organosilicon compound on the surface of the resin particle, and a second aspect is a toner production method in which an organosilicon compound is condensed in an aqueous medium which has a surfactant and a specific metal salt and in which a resin particle is dispersed, to produce a toner having the condensate of the organosilicon compound on the surface of the resin particle.Type: GrantFiled: May 9, 2018Date of Patent: June 4, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Kenta Kamikura, Kunihiko Nakamura, Maho Tanaka, Fumiya Hatakeyama
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Publication number: 20180329329Abstract: Provided is a toner comprising a toner particle including a toner base particle and fine particles present on a surface of the toner base particle, wherein each of the fine particles includes a core fine particle and a condensate of at least one organosilicon compound selected from the group consisting of organosilicon compounds represented by specific structural formulas, the condensate coating the surface of the core fine particle, and in a wettability test of the toner with respect to a methanol/water mixed solvent, a methanol concentration, when a transmittance of light having a wavelength of 780 nm is 50%, is 5.0 to 20.0% by volume: in above Formulas, each of Ra, Rb and Rc independently represents an alkyl group, an alkenyl group, an acetoxy group, an acyl group, an aryl group, or a methacryloxyalkyl group, R1 to R5 each independently represents a halogen atom or an alkoxy group.Type: ApplicationFiled: May 9, 2018Publication date: November 15, 2018Inventors: KUNIHIKO NAKAMURA, Kenta Kamikura, Maho Tanaka, Fumiya Hatakeyama
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Publication number: 20180329328Abstract: Provided is a toner, including a toner particle having: a toner base particle containing a binder resin and a colorant; and protrusion derived from a resin fine particle in a surface of the toner base particle, wherein the protrusion is covered with a condensation product of an organosilicon compound represented by the formula (1), and wherein the resin fine particle is in direct contact with the toner base particle.Type: ApplicationFiled: May 9, 2018Publication date: November 15, 2018Inventors: Maho Tanaka, Kunihiko Nakamura, Kenta Kamikura, Fumiya Hatakeyama, Akane Masumoto
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Publication number: 20180329325Abstract: Provided is a toner, including a toner particle containing a toner base particle and a fine particle, wherein the fine particle includes a composite particle each having a surface covered with a condensation product of at least one kind of organosilicon compound selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (2), wherein the fine particle is stuck in a state of being embedded in a surface of the toner base particle, and wherein a coverage of a composition containing the organosilicon compound with respect to the surface of the toner base particle excluding the fine particle is 0.1% by area or more and 40.Type: ApplicationFiled: May 9, 2018Publication date: November 15, 2018Inventors: Fumiya Hatakeyama, Kunihiko Nakamura, Kenta Kamikura, Maho Tanaka
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Publication number: 20180329324Abstract: A toner including: a toner particle including a toner base particle containing a binder resin, and an organosilicon condensate present on a surface of the toner base particle, wherein a charge attenuation constant of the toner is 3.5×10?3 or more to 1.0×100 or less.Type: ApplicationFiled: May 8, 2018Publication date: November 15, 2018Inventors: Kenta Kamikura, Kunihiko Nakamura, Maho Tanaka, Fumiya Hatakeyama
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Publication number: 20180329322Abstract: A first aspect is a toner production method in which an organosilicon compound is condensed in a surfactant-containing aqueous medium with a specific surface tension, in which a resin particle is dispersed, to produce a toner having the condensate of the organosilicon compound on the surface of the resin particle, and a second aspect is a toner production method in which an organosilicon compound is condensed in an aqueous medium which has a surfactant and a specific metal salt and in which a resin particle is dispersed, to produce a toner having the condensate of the organosilicon compound on the surface of the resin particle.Type: ApplicationFiled: May 9, 2018Publication date: November 15, 2018Inventors: Kenta Kamikura, Kunihiko Nakamura, Maho Tanaka, Fumiya Hatakeyama
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Publication number: 20180329321Abstract: There is provided a method of manufacturing a toner including a toner particle containing a binder resin, the method including: process 1: preparing a mixed solution including the following components i) to iii) in an aqueous medium: i) a particular silicon compound, ii) a fine particle having a number average particle diameter of 3 nm or more and 500 nm or less, and iii) a toner base particle containing the binder resin; and process 2: adjusting a pH of the mixed solution to 7.0 or more and 12.0 or less to condense the silicon compound, wherein the fine particle has an absolute value of zeta potential of 10.0 mV or more at the pH of the mixed solution of process 1.Type: ApplicationFiled: May 9, 2018Publication date: November 15, 2018Inventors: Kunihiko Nakamura, Kenta Kamikura, Maho Tanaka, Fumiya Hatakeyama