Patents by Inventor Yasushige Nakamura

Yasushige Nakamura 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).

  • Patent number: 10488772
    Abstract: An electrostatic-image developing toner contains toner particles containing a polycondensate resin and hydrophobic external additive particles having a volume average particle size of about 40 to about 200 nm. The electrostatic-image developing toner has a difference between a half-fall temperature T1/2A and a half-fall temperature T1/2B of about 2.0° C. to about 10° C. The half-fall temperature T1/2A is measured with a flow tester after storage in an environment at 50° C. and an absolute humidity of 16.5 g/m3 for 2 hours. The half-fall temperature T1/2B is measured with a flow tester after storage in an environment at 50° C. and an absolute humidity of 82.7 g/m3 for 2 hours.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: November 26, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shinichi Yaoi, Asafumi Fujita, Yasushige Nakamura, Seijiro Ishimaru
  • Patent number: 10353310
    Abstract: An electrostatic-image developing toner contains toner particles, each including a core particle and a shell layer disposed on at least a portion of a surface of the core particle. The core particle contains a first amorphous polyester resin containing structural units derived from a polycarboxylic acid and structural units derived from a polyol. About 5% by mass or less of the structural units derived from the polyol are structural units derived from a polyol containing a bisphenol-A backbone. The shell layer contains a second amorphous polyester resin containing structural units derived from a polycarboxylic acid and structural units derived from a polyol. About 50% by mass or more of the structural units derived from the polyol are structural units derived from a polyol containing a bisphenol-A backbone. The electrostatic-image developing toner has a water content of about 2.0% to about 5.0% by mass.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: July 16, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Asafumi Fujita, Shinichi Yaoi, Yasushige Nakamura, Seijiro Ishimaru
  • Publication number: 20180143551
    Abstract: An electrostatic-image developing toner contains toner particles, each including a core particle and a shell layer disposed on at least a portion of a surface of the core particle. The core particle contains a first amorphous polyester resin containing structural units derived from a polycarboxylic acid and structural units derived from a polyol. About 5% by mass or less of the structural units derived from the polyol are structural units derived from a polyol containing a bisphenol-A backbone. The shell layer contains a second amorphous polyester resin containing structural units derived from a polycarboxylic acid and structural units derived from a polyol. About 50% by mass or more of the structural units derived from the polyol are structural units derived from a polyol containing a bisphenol-A backbone. The electrostatic-image developing toner has a water content of about 2.0% to about 5.0% by mass.
    Type: Application
    Filed: September 5, 2017
    Publication date: May 24, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Asafumi FUJITA, Shinichi YAOI, Yasushige NAKAMURA, Seijiro ISHIMARU
  • Publication number: 20180095373
    Abstract: An electrostatic-image developing toner contains toner particles containing a polycondensate resin and hydrophobic external additive particles having a volume average particle size of about 40 to about 200 nm. The electrostatic-image developing toner has a difference between a half-fall temperature T1/2A and a half-fall temperature T1/2B of about 2.0° C. to about 10° C. The half-fall temperature T1/2A is measured with a flow tester after storage in an environment at 50° C. and an absolute humidity of 16.5 g/m3 for 2 hours. The half-fall temperature T1/2B is measured with a flow tester after storage in an environment at 50° C. and an absolute humidity of 82.7 g/m3 for 2 hours.
    Type: Application
    Filed: August 2, 2017
    Publication date: April 5, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shinichi YAOI, Asafumi FUJITA, Yasushige NAKAMURA, Seijiro ISHIMARU
  • Patent number: 9915886
    Abstract: An image forming apparatus includes a developing unit that contains an electrostatic charge image developer which contains a carrier and an electrostatic charge image developing toner, wherein the toner includes toner particles which contain a polyester resin, which is a polycondensate of a polycarboxylic acid and a polyol, and has a glass transition temperature of 50° C. to 70° C., the polyol includes a polyol not having a bisphenol A structure in a range of 50% by weight to 100% by weight, and a melt viscosity A of the toner at 110° C. after storage for 2 hours under the environment of absolute humidity of 82.7 (g/m3) and a melt viscosity B of the toner at 110° C. after storage for 2 hours under the environment of absolute humidity of 16.5 (g/m3) each are in the ranges specified in the specification.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: March 13, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Asafumi Fujita, Shinichi Yaoi, Seijiro Ishimaru, Yasushige Nakamura
  • Patent number: 9874827
    Abstract: An electrostatic charge image developing toner includes a carbodiimide compound and a polyester resin prepared by subjecting an alcohol component and a carboxylic acid component to condensation polymerization, wherein the alcohol component includes an aliphatic polyol in an amount of 60 mol % to 100 mol %.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: January 23, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasushige Nakamura, Shinichi Yaoi, Asafumi Fujita, Seijiro Ishimaru
  • Publication number: 20170277052
    Abstract: An image forming apparatus includes a developing unit that contains an electrostatic charge image developer which contains a carrier and an electrostatic charge image developing toner, wherein the toner includes toner particles which contain a polyester resin, which is a polycondensate of a polycarboxylic acid and a polyol, and has a glass transition temperature of 50° C. to 70° C., the polyol includes a polyol not having a bisphenol A structure in a range of 50% by weight to 100% by weight, and a melt viscosity A of the toner at 110° C. after storage for 2 hours under the environment of absolute humidity of 82.7 (g/m3) and a melt viscosity B of the toner at 110° C. after storage for 2 hours under the environment of absolute humidity of 16.5 (g/m3) each are in the ranges specified in the specification.
    Type: Application
    Filed: July 27, 2016
    Publication date: September 28, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Asafumi FUJITA, Shinichi YAOI, Seijiro ISHIMARU, Yasushige NAKAMURA
  • Publication number: 20170269492
    Abstract: An electrostatic charge image developing toner includes toner mother particles that contain a polyester resin which is a polycondensate of a polycarboxylic acid compound and a polyol compound; a graft polymer which includes a polyolefin chain and a vinyl resin chain; a coloring agent; and polyethylene wax, provided that the polyol compound includes a polyol compound having a bisphenol structure in an amount of 0 mol % to 5 mol %, wherein a normal temperature and normal humidity aggregation degree of the toner mother particles is from 70% to 97%.
    Type: Application
    Filed: July 26, 2016
    Publication date: September 21, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shinichi YAOI, Yasushige NAKAMURA, Seijiro ISHIMARU, Asafumi FUJITA
  • Publication number: 20170261878
    Abstract: An electrostatic charge image developing toner includes a carbodiimide compound and a polyester resin prepared by subjecting an alcohol component and a carboxylic acid component to condensation polymerization, wherein the alcohol component includes an aliphatic polyol in an amount of 60 mol % to 100 mol %.
    Type: Application
    Filed: July 25, 2016
    Publication date: September 14, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasushige NAKAMURA, Shinichi YAOI, Asafumi FUJITA, Seijiro ISHIMARU
  • Patent number: 9726993
    Abstract: An electrostatic charge image developing toner includes toner particles having a volume average particle diameter of 3 ?m to 16 ?m, wherein, when the toner particles having a particle diameter of 1.0 ?m to 30.0 ?m are set as T1, the toner particles having a particle diameter of 1.0 ?m to 2.5 ?m are set as T2, a rate of T2 to the toner particles is set as A, the toner particles having a particle diameter of 1.0 ?m to 5 ?m is set as T3 and a rate of T3 to the toner particles is set as B, the rate of T2 occupying T1 is from 10% by number to 40% by number and a fine particle ratio C represented by A/B is from 0.18 to 0.40.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: August 8, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shinichi Yaoi, Yasushige Nakamura
  • Publication number: 20170090316
    Abstract: An electrostatic charge image developing toner includes toner particles including a polyester resin that is a polycondensate of a polycarboxylic acid and a polyol not containing a derivative of bisphenol A, wherein, when a maximum value is present on a lowest molecular weight side in a molecular weight distribution curve obtained by subjecting a component soluble in tetrahydrofuran of the toner particles to a gel permeation chromatography measurement, a weight average molecular weight (Mw (A)) and a number average molecular weight thereof (Mn (A)), each with respect to a low molecular weight region (A) including the maximum value on the lowest molecular weight side, satisfy that a ratio Mw (A)/Mn (A) is 6.0 or less, and a small diameter side number average particle diameter distribution index of the toner particles is from 1.3 to 1.7.
    Type: Application
    Filed: January 27, 2016
    Publication date: March 30, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shinichi YAOI, Yasushige NAKAMURA, Seijiro ISHIMARU
  • Publication number: 20160266506
    Abstract: An electrostatic charge image developing toner includes toner particles having a volume average particle diameter of 3 ?m to 16 ?m, wherein, when the toner particles having a particle diameter of 1.0 ?m to 30.0 ?m are set as T1, the toner particles having a particle diameter of 1.0 ?m to 2.5 ?m are set as T2, a rate of T2 to the toner particles is set as A, the toner particles having a particle diameter of 1.0 ?m to 5 ?m is set as T3 and a rate of T3 to the toner particles is set as B, the rate of T2 occupying T1 is from 10% by number to 40% by number and a fine particle ratio C represented by A/B is from 0.18 to 0.40.
    Type: Application
    Filed: August 21, 2015
    Publication date: September 15, 2016
    Inventors: Shinichi YAOI, Yasushige NAKAMURA
  • Publication number: 20140370426
    Abstract: A non-magnetic single-component toner includes a toner base particle that contains at least a binder resin and a colorant, and an external additive, wherein the external additive includes an organic particle and an inorganic particle, the binder resin contains at least an amorphous polyester resin and a crystalline polyester resin, an endothermic peak of the crystalline polyester resin obtained by differential scanning calorimetry is from 50° C. to 100° C., the organic particle contains at least one kind selected from a group consisting of higher fatty acid, higher alcohol, fatty acid ester, and fatty acid amide, and the inorganic particle is treated with silicone oil.
    Type: Application
    Filed: October 23, 2013
    Publication date: December 18, 2014
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Daisuke ISHIZUKA, Shinichi YAOI, Tomoaki TANAKA, Seijiro ISHIMARU, Kotaro YOSHIHARA, Yasushige NAKAMURA
  • Patent number: 8802340
    Abstract: The invention provides an electrophotographic toner having at least: a binder resin, a coloring agent, and an alkali metal salt of polyethylene oxide. The invention further provides an electrophotographic developer having the electrophotographic toner, a process cartridge having a developer bearing body which accommodates the electrophotographic developer, and an image forming apparatus having a toner image forming member that forms a toner image on a recording medium by using the electrophotographic developer and a fixing member that fixes the toner image by heating and pressurizing or by photoirradiation. The processing speed in image formation using the image forming apparatus can be about 1,000 mm/sec or more.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: August 12, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasushige Nakamura, Shinichi Yaoi
  • Patent number: 8709695
    Abstract: A carrier for developing an electrostatic charge image includes a core containing a magnetic material and a coating layer, in which the coating layer includes porous carbon having a volume average particle size of from 0.5 ?m to 2 ?m and a BET specific surface area of from 1 m2/g to 5 m2/g, and a resin.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: April 29, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Yasushige Nakamura
  • Patent number: 8597865
    Abstract: An electrostatic-image-developing toner includes a polyester resin; two or more pigments; a polyethylene wax; and a polyolefin-polyvinyl-based graft copolymer, and satisfies the relationship represented by the following equation (1): 0.2?wd/wp?5.0??(1) wherein wp represents a total content (wt. %) of the pigments, and wd represents a content (wt. %) of the polyolefin-polyvinyl-based graft copolymer.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: December 3, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Daisuke Ishizuka, Shinichi Yaoi, Yasushige Nakamura
  • Publication number: 20130252168
    Abstract: A carrier for developing an electrostatic charge image includes a core containing a magnetic material and a coating layer, in which the coating layer includes porous carbon having a volume average particle size of from 0.5 ?m to 2 ?m and a BET specific surface area of from 1 m2/g to 5 m2/g, and a resin.
    Type: Application
    Filed: July 20, 2012
    Publication date: September 26, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Yasushige NAKAMURA
  • Patent number: 8435708
    Abstract: A magenta toner contains a binder resin; at least one selected from a diimonium compound represented by the following general formula (1) and an aminium compound represented by the following general formula (2); and a monomethylquinacridone: where in the general formulae (1) and (2), Rl, R2, R3, R4, R5, R6, R7 and R8 each independently represent a hydrogen atom, an unsubstituted or substituted and linear alkyl group, an unsubstituted or substituted and branched alkyl group, an unsubstituted or substituted and cyclic alkyl group, an unsubstituted or substituted and linear alkenyl group, an unsubstituted or substituted and branched alkenyl group, an unsubstituted or substituted and cyclic alkenyl group, or an unsubstituted or substituted aralkyl group; and X?represents an anion.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: May 7, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasushige Nakamura, Shinichi Yaoi
  • Patent number: 8097389
    Abstract: The invention provides a color toner for flash fusing containing at least: a binder resin, a colorant, a leuco dye, a developer and a decolorizer. An absorbance of the color toner after photoirradiation at a wavelength of about 900 nm is smaller than an absorbance of the color toner before the photoirradiation at the wavelength of about 900 nm. The invention further provides a method for producing the color toner, a electrostatic image developer comprising the color toner, a process cartridge comprising a developer bearing body which accommodates the electrostatic image developer, and an image forming apparatus to form a toner image by the electrostatic image developer.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: January 17, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Yasushige Nakamura
  • Publication number: 20110318684
    Abstract: A magenta toner contains a binder resin; at least one selected from a diimonium compound represented by the following general formula (1) and an aminium compound represented by the following general formula (2); and a monomethylquinacridone: wherein in the general formulae (1) and (2), R1, R2, R3, R4, R5, R6, R7 and R8 each independently represent a hydrogen atom, an unsubstituted or substituted and linear alkyl group, an unsubstituted or substituted and branched alkyl group, an unsubstituted or substituted and cyclic alkyl group, an unsubstituted or substituted and linear alkenyl group, an unsubstituted or substituted and branched alkenyl group, an unsubstituted or substituted and cyclic alkenyl group, or an unsubstituted or substituted aralkyl group; and X? represents an anion.
    Type: Application
    Filed: October 28, 2010
    Publication date: December 29, 2011
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasushige NAKAMURA, Shinichi YAOI