Patents by Inventor Takako Kobayashi

Takako Kobayashi 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: 9482978
    Abstract: A liquid developer includes a carrier liquid, and a toner particle which contains a resin having an unsaturated double bond, a compound represented by the formula (I) and a photopolymerization initiator and whose surface is treated by a polyamine, wherein m and n each independently represent an integer of 1 to 10,000; m+n represents an integer of 10 to 10,000; and R1, R2, and R3 each independently represent a single bond or a divalent aliphatic hydrocarbon group having 1 to 12 carbon atoms.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: November 1, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Koji Horiba, Masahiro Oki, Yoshihiro Inaba, Akira Imai, Daisuke Yoshino, Takako Kobayashi, Hiroyuki Moriya
  • Patent number: 9436133
    Abstract: An image forming apparatus includes an electrostatic latent image holding member, a charging device, a latent image forming device, a developing device that stores a liquid developer containing a toner and a non-volatile carrier liquid, and develops the electrostatic latent image formed on the surface of the electrostatic latent image holding member by the liquid developer to form a toner image, a transfer device that transfers the toner image onto a surface of an impermeable recording medium, and a fixing device, wherein when the SP value of the toner is set as SP(t), the SP value of the non-volatile carrier liquid is set as SP(c), and the SP value of the recording medium is set as SP(m), an absolute value of a difference between SP(t) and SP(c) is from 1.5 to 7.0 and the following relational expression (A) is satisfied: |SP(c)?SP(m)|>|SP(t)?SP(m)|.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: September 6, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Satoshi Tatsuura, Yutaka Nogami, Keitaro Mori, Yoshihiro Inaba, Takako Kobayashi, Daisuke Yoshino
  • Patent number: 9436113
    Abstract: An electrostatic charge image developing toner includes a toner particle that contains a binder resin and is surface-modified by a polymer obtained by polymerizing a monomer containing dicyandiamide and diethylenetriamine, wherein toner particles have positive charging properties.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: September 6, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masahiro Oki, Akira Imai, Koji Horiba, Takako Kobayashi, Daisuke Yoshino, Yoshihiro Inaba, Hiroyuki Moriya
  • Publication number: 20160231663
    Abstract: A liquid developer includes a carrier liquid and a toner particle whose surface is treated by a polyamine, wherein an amount of sodium ion to be eluted in 1 g of the toner particles is 0.04 mg or less.
    Type: Application
    Filed: August 12, 2015
    Publication date: August 11, 2016
    Inventors: Yoshihiro INABA, Takako KOBAYASHI, Daisuke YOSHINO, Akira IMAI, Masahiro OKI, Koji HORIBA, Hiroyuki MORIYA
  • Publication number: 20160223929
    Abstract: A liquid developer includes a carrier liquid, and a toner particle which contains a resin having an unsaturated double bond, a compound represented by the formula (I) and a photopolymerization initiator and whose surface is treated by a polyamine, wherein m and n each independently represent an integer of 1 to 10,000; m+n represents an integer of 10 to 10,000; and R1, R2, and R3 each independently represent a single bond or a divalent aliphatic hydrocarbon group having 1 to 12 carbon atoms.
    Type: Application
    Filed: July 31, 2015
    Publication date: August 4, 2016
    Inventors: Koji HORIBA, Masahiro OKI, Yoshihiro INABA, Akira IMAI, Daisuke YOSHINO, Takako KOBAYASHI, Hiroyuki MORIYA
  • Publication number: 20160202626
    Abstract: A liquid developer contains a carrier liquid and a toner particle which contains a binder resin, wherein the toner particles have a content of aluminum measured by fluorescent X-ray analysis in a range of from 0.04% by weight to 0.1% by weight of total elements.
    Type: Application
    Filed: August 19, 2015
    Publication date: July 14, 2016
    Inventors: Akira IMAI, Koji HORIBA, Daisuke YOSHINO, Takako KOBAYASHI, Masahiro OKI, Yoshitake OGURA, Hiroyuki MORIYA, Yoshihiro INABA
  • Publication number: 20160187800
    Abstract: An electrostatic charge image developing toner includes a toner particle that contains a binder resin and is surface-modified by a polymer obtained by polymerizing a monomer containing dicyandiamide and diethylenetriamine, wherein toner particles have positive charging properties.
    Type: Application
    Filed: July 28, 2015
    Publication date: June 30, 2016
    Inventors: Masahiro OKI, Akira IMAI, Koji HORIBA, Takako KOBAYASHI, Daisuke YOSHINO, Yoshihiro INABA, Hiroyuki MORIYA
  • Patent number: 9285700
    Abstract: A liquid developer includes a carrier liquid having silicone oil, and toner particles including a polyester resin and having a value of ammonium ions contained therein measured by underwater extraction in a range of 0.005 ppm to 1 ppm.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: March 15, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takako Kobayashi, Daisuke Yoshino, Akira Imai, Koji Horiba, Masahiro Oki, Hiroyuki Moriya, Yoshihiro Inaba
  • Publication number: 20160048097
    Abstract: An image forming method includes forming an unfixed toner image on a recording medium using a toner that contains a carboxyl group-containing resin having a carboxyl group and an oxazoline group-containing resin having an oxazoline group, fixing the unfixed toner image to the recording medium to form a fixed toner image, and performing a heat treatment on the fixed toner image at a temperature higher than or equal to a fixing temperature.
    Type: Application
    Filed: January 14, 2015
    Publication date: February 18, 2016
    Inventors: Yoshihiro INABA, Koji HORIBA, Akira IMAI, Masahiro OKI, Takako KOBAYASHI, Daisuke YOSHINO, Hiroyuki MORIYA
  • Publication number: 20160026106
    Abstract: A positively chargeable toner includes at least a binder resin, and toner particles of which surfaces are modified by a polyvinylamine compound.
    Type: Application
    Filed: January 12, 2015
    Publication date: January 28, 2016
    Inventors: Masahiro OKI, Akira IMAI, Yoshihiro INABA, Takako KOBAYASHI, Daisuke YOSHINO, Hiroyuki MORIYA, Koji HORIBA
  • Patent number: 9244393
    Abstract: An image forming method includes forming an unfixed toner image on a recording medium using a toner that contains a carboxyl group-containing resin having a carboxyl group and an oxazoline group-containing resin having an oxazoline group, fixing the unfixed toner image to the recording medium to form a fixed toner image, and performing a heat treatment on the fixed toner image at a temperature higher than or equal to a fixing temperature.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: January 26, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshihiro Inaba, Koji Horiba, Akira Imai, Masahiro Oki, Takako Kobayashi, Daisuke Yoshino, Hiroyuki Moriya
  • Publication number: 20150147692
    Abstract: A liquid developer includes a carrier liquid having silicone oil, and toner particles including a polyester resin and having a value of ammonium ions contained therein measured by underwater extraction in a range of 0.005 ppm to 1 ppm.
    Type: Application
    Filed: May 27, 2014
    Publication date: May 28, 2015
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takako KOBAYASHI, Daisuke YOSHINO, Akira IMAI, Koji HORIBA, Masahiro OKI, Hiroyuki MORIYA, Yoshihiro INABA
  • Publication number: 20150104215
    Abstract: An image forming apparatus includes an electrostatic latent image holding member, a charging device, a latent image forming device, a developing device that stores a liquid developer containing a toner and a non-volatile carrier liquid, and develops the electrostatic latent image formed on the surface of the electrostatic latent image holding member by the liquid developer to form a toner image, a transfer device that transfers the toner image onto a surface of an impermeable recording medium, and a fixing device, wherein when the SP value of the toner is set as SP(t), the SP value of the non-volatile carrier liquid is set as SP(c), and the SP value of the recording medium is set as SP(m), an absolute value of a difference between SP(t) and SP(c) is from 1.5 to 7.0 and the following relational expression (A) is satisfied: |SP(c)?SP(m)|>|SP(t)?SP(m)|.
    Type: Application
    Filed: April 16, 2014
    Publication date: April 16, 2015
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Satoshi TATSUURA, Yutaka NOGAMI, Keitaro MORI, Yoshihiro INABA, Takako KOBAYASHI, Daisuke YOSHINO
  • Patent number: 8951704
    Abstract: A toner includes a crystalline polyester resin having an unsaturated double bond, a thiol compound having a bi- or more-functional thiol group, and a photopolymerization initiator.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: February 10, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Koji Horiba, Yoshihiro Inaba, Daisuke Yoshino, Takako Kobayashi, Akira Imai, Masahiro Oki, Hiroyuki Moriya
  • Patent number: 8911925
    Abstract: A liquid developer contains a carrier liquid, and toner particles containing a binder resin and a pigment surface-treated with a polyallylamine compound as a colorant.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: December 16, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masahiro Oki, Yoshihiro Inaba, Akira Imai, Daisuke Yoshino, Takako Kobayashi, Koji Horiba
  • Publication number: 20140272693
    Abstract: A toner includes a crystalline polyester resin having an unsaturated double bond, a thiol compound having a bi- or more-functional thiol group, and a photopolymerization initiator.
    Type: Application
    Filed: August 8, 2013
    Publication date: September 18, 2014
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Koji HORIBA, Yoshihiro INABA, Daisuke YOSHINO, Takako KOBAYASHI, Akira IMAI, Masahiro OKI, Hiroyuki MORIYA
  • Patent number: 8741527
    Abstract: A liquid developer includes: a carrier liquid; and toner particles that are dispersed in the carrier liquid and that includes a styrene-based thermoplastic elastomer, a styrene-based thermoplastic resin, and a quaternary ammonium base-containing polymer having a constituent unit expressed by Chemical Formula I: wherein R1 represents hydrogen or an alkyl group with a carbon number equal to or less than 3, R2 represents an alkylene group with a carbon number equal to or less than 18, R3 to R5 represent an alkyl group or an aralkyl group with a carbon number equal to or less than 18, X represents —COO— or —CONH—, and Y? represents a halogen ion or an anion having a —COO— group or a —SO3— group in the structure thereof.
    Type: Grant
    Filed: December 28, 2011
    Date of Patent: June 3, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yoshihiro Inaba, Akira Imai, Daisuke Yoshino, Takako Kobayashi, Koji Horiba, Takahiro Ishizuka, Masahiro Oki, Ryosaku Igarashi
  • Patent number: 8673531
    Abstract: The present invention provides a liquid developer including an insulating carrier liquid and toner particles containing a binder resin, the binder resin including a styrene-based thermoplastic elastomer and a styrene thermoplastic resin, and the toner particles being dispersed in the insulating carrier liquid.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: March 18, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yoshihiro Inaba, Akira Imai, Daisuke Yoshino, Takako Kobayashi, Koji Horiba, Ryosaku Igarashi
  • Patent number: 8658338
    Abstract: A toner includes a resin having an unsaturated double bond, a thiol compound having a bi- or more-functional thiol group, and a polymerization initiator.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: February 25, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Koji Horiba, Takahiro Ishizuka, Yoshihiro Inaba, Akira Imai, Ryosaku Igarashi, Takako Kobayashi, Daisuke Yoshino, Masahiro Oki
  • Patent number: 8563209
    Abstract: A liquid developer includes: a carrier liquid and toner particles dispersed in the carrier liquid, including a binder resin which contains a thermoplastic resin having repeating units derived from a monomer having a styrene skeleton and repeating units derived from a monomer having an acrylic ester structure, and a thermoplastic elastomer resin that is a block copolymer, the block copolymer having a first block portion including repeating units derived from a monomer having a styrene skeleton, a second block portion including repeating units derived from an alkene having 2 to 6 carbon atoms, and a third block portion including repeating units derived from a monomer having a styrene skeleton and these block portions being bonded in this order.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: October 22, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Koji Horiba, Yoshihiro Inaba, Ryosaku Igarashi, Akira Imai, Takako Kobayashi, Daisuke Yoshino, Takahiro Ishizuka