Patents by Inventor Miyuki HOTTA
Miyuki HOTTA 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: 10007207Abstract: A liquid developer in which toner particles are dispersed in an insulating liquid, the toner particles having such a core-shell structure that shell particles containing a shell resin are attached to or cover surfaces of core particles containing a core resin, the core resin having an acid group and an acid dissociation constant not smaller than 2.90 and not greater than 8.00, and a method for manufacturing the same are provided. The toner particles can have a volume average particle size not smaller than 0.01 ?m and not greater than 100 ?m and a coefficient of variation of volume distribution not lower than 1% and not higher than 100%. This liquid developer has excellent fixability which allows adaptation to various recording materials, can be fixed in a wide temperature range, and is extremely low in deterioration in fixability during storage.Type: GrantFiled: September 11, 2013Date of Patent: June 26, 2018Assignee: KONICA MINOLTA, INC.Inventors: Yukiko Uno, Satoshi Matsumoto, Naoki Yoshie, Miyuki Hotta
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Publication number: 20150277257Abstract: A liquid developer in which toner particles are dispersed in an insulating liquid, the toner particles having such a core-shell structure that shell particles containing a shell resin are attached to or cover surfaces of core particles containing a core resin, the core resin having an acid group and an acid dissociation constant not smaller than 2.90 and not greater than 8.00, and a method for manufacturing the same are provided. The toner particles can have a volume average particle size not smaller than 0.01 ?m and not greater than 100 ?m and a coefficient of variation of volume distribution not lower than 1% and not higher than 100%. This liquid developer has excellent fixability which allows adaptation to various recording materials, can be fixed in a wide temperature range, and is extremely low in deterioration in fixability during storage.Type: ApplicationFiled: September 11, 2013Publication date: October 1, 2015Applicant: KONICA MINOLTA, INC.Inventors: Yukiko Uno, Satoshi Matsumoto, Naoki Yoshie, Miyuki Hotta
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Patent number: 8974996Abstract: A liquid developer used for wet-type image forming apparatuses includes toner particles and an insulating liquid, the toner particles include a resin, a pigment, and a pigment dispersant, the pigment includes a pigment having an acid group, and the pigment dispersant is a basic polymer dispersant including units derived from ?-caprolactone.Type: GrantFiled: November 1, 2012Date of Patent: March 10, 2015Assignee: Konica Minolta Business Technologies, Inc.Inventors: Naoki Yoshie, Kenji Hayashi, Chiaki Yamada, Keiko Momotani, Masahiro Anno, Yuya Kubo, Miyuki Hotta
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Publication number: 20140234770Abstract: A liquid developer includes an insulating liquid and a plurality of toner particles. The plurality of toner particles has a volume-based median size not smaller than 0.5 ?m and not greater than 3 ?m as a whole, and a volume-based coefficient of variation not lower than 40% and not higher than 130%. The plurality of toner particles includes a first toner particle group of the toner particles having a particle size not greater than 1 ?m. The number of toner particles constituting the first toner particle group occupies not lower than 20% of the total number of toner particles. The toner particles in the first toner particle group have an average circularity not smaller than 0.945.Type: ApplicationFiled: February 20, 2014Publication date: August 21, 2014Applicant: Konica Minolta, Inc.Inventors: Miyuki HOTTA, Masahiro Anno, Naoki Yoshie, Keiko Momotani, Sho Kim, Yukiko Uno, Satoshi Matsumoto
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Publication number: 20140234769Abstract: A liquid developer includes an insulating liquid and a plurality of toner particles. The plurality of toner particles has a median size not smaller than 1 ?m and not greater than 3 ?m as a whole. In the plurality of toner particles, average circularity is not smaller than 0.90 and not greater than 0.96, and a standard deviation of circularity is not smaller than 0.02 and not greater than 0.10.Type: ApplicationFiled: February 20, 2014Publication date: August 21, 2014Applicant: Konica Minolta, Inc.Inventors: Naoki YOSHIE, Masahiro ANNO, Keiko MOMOTANI, Miyuki HOTTA, Satoshi MATSUMOTO, Sho KIM, Yukiko UNO
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Patent number: 8617782Abstract: A liquid developer includes at least toner particles and an insulating liquid. The toner particles include a resin and a color material dispersed in the resin. 90 mass % or more of the insulating liquid is aliphatic saturated hydrocarbon having a carbon number of 11 to 16, and 20 to 60 mass % of the insulating liquid is aliphatic saturated hydrocarbon having a carbon number of 11 to 12.Type: GrantFiled: August 14, 2012Date of Patent: December 31, 2013Assignee: Konica Minolta Business Technologies, Inc.Inventors: Keiko Momotani, Yuya Kubo, Masahiro Anno, Naoki Yoshie, Kenji Hayashi, Chiaki Yamada, Miyuki Hotta
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Publication number: 20130115552Abstract: A liquid developer used for wet-type image forming apparatuses includes toner particles and an insulating liquid, the toner particles include a resin, a pigment, and a pigment dispersant, the pigment includes a pigment having an acid group, and the pigment dispersant is a basic polymer dispersant including units derived from ?-caprolactone.Type: ApplicationFiled: November 1, 2012Publication date: May 9, 2013Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Naoki YOSHIE, Kenji HAYASHI, Chiaki YAMADA, Keiko MOMOTANI, Masahiro ANNO, Yuya KUBO, Miyuki HOTTA
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Publication number: 20130065176Abstract: A liquid developer includes at least toner particles and an insulating liquid. The toner particles include a resin and a color material dispersed in the resin. 90 mass % or more of the insulating liquid is aliphatic saturated hydrocarbon having a carbon number of 11 to 16, and 20 to 60 mass % of the insulating liquid is aliphatic saturated hydrocarbon having a carbon number of 11 to 12.Type: ApplicationFiled: August 14, 2012Publication date: March 14, 2013Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Keiko MOMOTANI, Yuya KUBO, Masahiro ANNO, Naoki YOSHIE, Kenji HAYASHI, Chiaki YAMADA, Miyuki HOTTA