Patents by Inventor Shinichiro Kawashima
Shinichiro Kawashima 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: 9416015Abstract: The invention provides a method of producing silica particles, the method including preparing an alkali catalyst solution containing an alkali catalyst in a solvent including an alcohol, at a concentration of from about 0.6 mol/L to about 0.85 mol/L; and supplying tetraalkoxysilane into the alkali catalyst solution, and concurrently supplying an alkali catalyst into the alkali catalyst solution at a rate of from about 0.1 mol to about 0.4 mol per mole of the total amount of supply of the tetraalkoxysilane supplied in one minute.Type: GrantFiled: October 18, 2010Date of Patent: August 16, 2016Assignee: FUJI XEROX CO., LTD.Inventors: Hideaki Yoshikawa, Yuka Zenitani, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi
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Patent number: 9394413Abstract: A resin particle having: a resin mother particle; and silica particles external added onto the surface of the resin mother particle, wherein a primary particles of the silica particles which have a volume average particle diameter of from 100 nm to 500 nm, a particle size distribution index of from 1.40 to 1.80 and an average circularity of from 0.5 to 0.85 has a regression line expressed by the following expression (1) with respect to the circularity and the volume average particle diameter (nm): Circularity=?×(Volume average particle diameter)/1000+???(1) wherein ? is from ?2.5 to ?0.9, and ? is from 0.8 to 1.2.Type: GrantFiled: April 29, 2014Date of Patent: July 19, 2016Assignee: FUJI XEROX CO., LTD.Inventors: Hideaki Yoshikawa, Yuka Zenitani, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi, Yasuo Kadokura
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Patent number: 9233853Abstract: A method for producing silica particles, includes preparing a silica particle dispersion containing silica particles, and a solvent containing an alcohol and water, and bringing supercritical carbon dioxide into contact with the silica particle dispersion to remove the solvent.Type: GrantFiled: November 3, 2011Date of Patent: January 12, 2016Assignee: FUJI XEROX CO., LTD.Inventors: Sakae Takeuchi, Shinichiro Kawashima, Hiroyoshi Okuno, Hideaki Yoshikawa, Yuji Masuda, Shunsuke Nozaki, Yuka Zenitani
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Patent number: 9199852Abstract: A method of manufacturing a silica particle dispersion, includes preparing a silica particle dispersion containing silica particles and a solvent, primary concentrating the silica particle dispersion, adding a hydrophobizing treatment agent to the silica particle dispersion after the primary concentrating, and secondary concentrating the silica particle dispersion after the adding.Type: GrantFiled: January 26, 2012Date of Patent: December 1, 2015Assignee: FUJI XEROX CO., LTD.Inventors: Sakae Takeuchi, Shinichiro Kawashima, Hiroyoshi Okuno, Hideaki Yoshikawa, Yasuo Kadokura, Shunsuke Nozaki, Yuka Zenitani
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Patent number: 9187502Abstract: The present invention provides silica particles including primary particles, the primary particles having an average particle diameter in a range of from about 100 nm to about 500 nm, a particle size distribution index in a range of from about 1.40 to about 1.80, and an average roundness in a range of from about 0.5 to about 0.85, and about 95% or more, by number of particles, of the primary particles satisfying following Formula (1) with respect to a roundness (R) and a particle diameter (D) (nm): R=?×D/1000+???Formula (1) (?2.5????0.9, 0.8???1.2).Type: GrantFiled: November 2, 2010Date of Patent: November 17, 2015Assignee: FUJI XEROX CO., LTD.Inventors: Hideaki Yoshikawa, Yuka Zenitani, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi
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Patent number: 8962139Abstract: A resin particle including: a resin mother particle; and silica particles externally added onto a surface of the resin mother particle, wherein primary particles of the silica particles, the primary particles which have a volume average particle diameter of from 80 nm to 300 nm, a particle size distribution index of from 1.10 to 1.40, an average circularity of from 0.70 to 0.92 and an average circularity distribution index of from 1.05 to 1.50, and a proportion of the primary particles having an average circularity of 0.95 or more is not more 10% by number.Type: GrantFiled: August 22, 2011Date of Patent: February 24, 2015Assignee: Fuji Xerox Co., Ltd.Inventors: Yuka Zenitani, Hideaki Yoshikawa, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi, Yasuo Kadokura
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Patent number: 8871344Abstract: The invention provides silica particles including primary particles, the primary particles having a volume average particle diameter of from about 80 nm to about 300 nm, a particle size distribution index of from about 1.10 to about 1.40, an average circularity of from about 0.70 to about 0.92, and a circularity distribution index of from about 1.05 to about 1.50, the silica particles including primary particles having a circularity of about 0.95 or greater at a proportion of about 10% or less by number of particles.Type: GrantFiled: October 26, 2010Date of Patent: October 28, 2014Assignee: Fuji Xerox Co., Ltd.Inventors: Yuka Zenitani, Hideaki Yoshikawa, Hiroyoshi Okuno, Shunsuke Nozaki, Shinichiro Kawashima, Sakae Takeuchi
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Publication number: 20140234626Abstract: A resin particle having: a resin mother particle; and silica particles external added onto the surface of the resin mother particle, wherein a primary particles of the silica particles which have a volume average particle diameter of from 100 nm to 500 nm, a particle size distribution index of from 1.40 to 1.80 and an average circularity of from 0.5 to 0.85 has a regression line expressed by the following expression (1) with respect to the circularity and the volume average particle diameter (nm): Circularity=?×(Volume average particle diameter)/1000+???(1) wherein ? is from ?2.5 to ?0.9, and ? is from 0.8 to 1.2.Type: ApplicationFiled: April 29, 2014Publication date: August 21, 2014Applicant: FUJI XEROX CO., LTD.Inventors: Hideaki YOSHIKAWA, Yuka ZENITANI, Hiroyoshi OKUNO, Shunsuke NOZAKI, Shinichiro KAWASHIMA, Sakae TAKEUCHI, Yasuo KADOKURA
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Patent number: 8628900Abstract: An electrostatic charge image developing toner includes: toner particles; and an external additive. The external additive contains sol-gel silica having a volume average particle diameter of from about 70 nm to about 400 nm and an average circularity of from about 0.5 to about 0.9, and a dielectric loss factor of the toner is from about 5×10?3 to about 30×10?3 when the toner is kept for 24 hours under the environment of a temperature of 28° C. and a humidity of 85%.Type: GrantFiled: January 18, 2012Date of Patent: January 14, 2014Assignee: Fuji Xerox Co., Ltd.Inventors: Yasuo Kadokura, Shunsuke Nozaki, Hideaki Yoshikawa, Shinichiro Kawashima, Sakae Takeuchi, Yuka Zenitani, Sakon Takahashi, Hiroyoshi Okuno
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Patent number: 8431633Abstract: Disclosed are silica particles having a volume average particle size of from about 100 nm to about 500 nm, an average circularity degree of from about 0.5 to about 0.85, and an average value of the ratios of circle equivalent diameters Da of the silica particles obtained by a flat image analysis to maximum heights H of the silica particles obtained by a stereoscopic image analysis of more than 1.5 and less than 1.9.Type: GrantFiled: December 29, 2011Date of Patent: April 30, 2013Assignee: Fuji Xerox Co., Ltd.Inventors: Hideaki Yoshikawa, Yuka Zenitani, Hiroyoshi Okuno, Shinichiro Kawashima, Yasuo Kadokura, Shunsuke Nozaki, Sakae Takeuchi
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Publication number: 20130075652Abstract: A method of manufacturing a silica particle dispersion, includes preparing a silica particle dispersion containing silica particles and a solvent, primary concentrating the silica particle dispersion, adding a hydrophobizing treatment agent to the silica particle dispersion after the primary concentrating, and secondary concentrating the silica particle dispersion after the adding.Type: ApplicationFiled: January 26, 2012Publication date: March 28, 2013Applicant: FUJI XEROX CO., LTD.Inventors: Sakae TAKEUCHI, Shinichiro KAWASHIMA, Hiroyoshi OKUNO, Hideaki YOSHIKAWA, Yasuo KADOKURA, Shunsuke NOZAKI, Yuka ZENITANI
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Publication number: 20130065170Abstract: An electrostatic charge image developing toner includes: toner particles; and an external additive. The external additive contains sol-gel silica having a volume average particle diameter of from about 70 nm to about 400 nm and an average circularity of from about 0.5 to about 0.9, and a dielectric loss factor of the toner is from about 5×10?3 to about 30×10?3 when the toner is kept for 24 hours under the environment of a temperature of 28° C. and a humidity of 85%.Type: ApplicationFiled: January 18, 2012Publication date: March 14, 2013Applicant: FUJI XEROX CO., LTD.Inventors: Yasuo KADOKURA, Shunsuke NOZAKI, Hideaki YOSHIKAWA, Shinichiro KAWASHIMA, Sakae TAKEUCHI, Yuka ZENITANI, Sakon TAKAHASHI, Hiroyoshi OKUNO
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Publication number: 20130012657Abstract: Disclosed are silica particles having a volume average particle size of from about 100 nm to about 500 nm, an average circularity degree of from about 0.5 to about 0.85, and an average value of the ratios of circle equivalent diameters Da of the silica particles obtained by a flat image analysis to maximum heights H of the silica particles obtained by a stereoscopic image analysis of more than 1.5 and less than 1.9.Type: ApplicationFiled: December 29, 2011Publication date: January 10, 2013Applicant: FUJI XEROX CO., LTD.Inventors: Hideaki YOSHIKAWA, Yuka ZENITANI, Hiroyoshi OKUNO, Shinichiro KAWASHIMA, Yasuo KADOKURA, Shunsuke NOZAKI, Sakae TAKEUCHI
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Publication number: 20120189851Abstract: A resin particle including: a resin mother particle; and silica particles externally added onto a surface of the resin mother particle, wherein primary particles of the silica particles, the primary particles which have a volume average particle diameter of from 80 nm to 300 inn, a particle size distribution index of from 1.10 to 1.40, an average circularity of from 0.70 to 0.92 and an average circularity distribution index of from 1.05 to 1.50, and a proportion of the primary particles having an average circularity of 0.95 or more is not more 10% by number.Type: ApplicationFiled: August 22, 2011Publication date: July 26, 2012Applicant: FUJI XEROX CO., LTD.Inventors: Yuka ZENITANI, Hideaki YOSHIKAWA, Hiroyoshi OKUNO, Shunsuke NOZAKI, Shinichiro KAWASHIMA, Sakae TAKEUCHI, Yasuo KADOKURA
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Publication number: 20120183777Abstract: A resin particle having: a resin mother particle; and silica particles external added onto the surface of the resin mother particle, wherein a primary particles of the silica particles which have a volume average particle diameter of from 100 nm to 500 nm, a particle size distribution index of from 1.40 to 1.80 and an average circularity of from 0.5 to 0.85 has a regression line expressed by the following expression (1) with respect to the circularity and the volume average particle diameter (nm): Circularity=?×(Volume average particle diameter)/1000+???(1) wherein ? is from ?2.5 to ?0.9, and ? is from 0.8 to 1.2.Type: ApplicationFiled: August 22, 2011Publication date: July 19, 2012Applicant: FUJI XEROX CO., LTD.Inventors: Hideaki YOSHIKAWA, Yuka ZENITANI, Hiroyoshi OKUNO, Shunsuke NOZAKI, Shinichiro KAWASHIMA, Sakae TAKEUCHI, Yasuo KADOKURA
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Publication number: 20120148470Abstract: A method for producing silica particles, includes preparing a silica particle dispersion containing silica particles, and a solvent containing an alcohol and water, and bringing supercritical carbon dioxide into contact with the silica particle dispersion to remove the solvent.Type: ApplicationFiled: November 3, 2011Publication date: June 14, 2012Applicant: FUJI XEROX CO., LTD.Inventors: Sakae TAKEUCHI, Shinichiro KAWASHIMA, Hiroyoshi OKUNO, Hideaki YOSHIKAWA, Yuji MASUDA, Shunsuke NOZAKI, Yuka ZENITANI
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Publication number: 20110318584Abstract: The present invention provides silica particles including primary particles, the primary particles having an average particle diameter in a range of from about 100 nm to about 500 nm, a particle size distribution index in a range of from about 1.40 to about 1.80, and an average roundness in a range of from about 0.5 to about 0.85, and about 95% or more, by number of particles, of the primary particles satisfying following Formula (1) with respect to a roundness (R) and a particle diameter (D) (nm): R=?×D/1000+???Formula (1) (?2.5????0.9, 0.8???1.2).Type: ApplicationFiled: November 2, 2010Publication date: December 29, 2011Applicant: FUJI XEROX CO., LTD.Inventors: Hideaki YOSHIKAWA, Yuka ZENITANI, Hiroyoshi OKUNO, Shunsuke NOZAKI, Shinichiro KAWASHIMA, Sakae TAKEUCHI
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Publication number: 20110318581Abstract: The invention provides silica particles including primary particles, the primary particles having a volume average particle diameter of from about 80 nm to about 300 nm, a particle size distribution index of from about 1.10 to about 1.40, an average circularity of from about 0.70 to about 0.92, and a circularity distribution index of from about 1.05 to about 1.50, the silica particles including primary particles having a circularity of about 0.95 or greater at a proportion of about 10% or less by number of particles.Type: ApplicationFiled: October 26, 2010Publication date: December 29, 2011Applicant: FUJI XEROX CO., LTD.Inventors: Yuka ZENITANI, Hideaki YOSHIKAWA, Hiroyoshi OKUNO, Shunsuke NOZAKI, Shinichiro KAWASHIMA, Sakae TAKEUCHI
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Publication number: 20110319647Abstract: The invention provides a method of producing silica particles, the method including preparing an alkali catalyst solution containing an alkali catalyst in a solvent including an alcohol, at a concentration of from about 0.6 mol/L to about 0.85 mol/L; and supplying tetraalkoxysilane into the alkali catalyst solution, and concurrently supplying an alkali catalyst into the alkali catalyst solution at a rate of from about 0.1 mol to about 0.4 mol per mole of the total amount of supply of the tetraalkoxysilane supplied in one minute.Type: ApplicationFiled: October 18, 2010Publication date: December 29, 2011Applicant: FUJI XEROX CO., LTD.Inventors: Hideaki YOSHIKAWA, Yuka ZENITANI, Hiroyoshi OKUNO, Shunsuke NOZAKI, Shinichiro KAWASHIMA, Sakae TAKEUCHI
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Patent number: 7468137Abstract: A wastewater treatment process for treating wastewater comprising a water-based dispersion containing a surfactant, a colorant and silica, as well as other solid matter, wherein the wastewater is treated using a polysilicato-iron coagulant.Type: GrantFiled: November 7, 2005Date of Patent: December 23, 2008Assignee: Fuji Xerox Co., Ltd.Inventors: Hitoshi Kojima, Shinichiro Kawashima, Kazuya Mori, Atsushi Yamahashi, Yuji Masuda