Patents by Inventor Ryotaro KOMADA

Ryotaro KOMADA 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: 10545423
    Abstract: A toner includes toner particles each including a toner mother particle and an external additive adhering to a surface of the toner mother particle. The external additive includes silica particles. The silica particles each include a silica base, a first surface treatment layer covering the silica base, and a second surface treatment layer covering the first surface treatment layer. The first surface treatment layer contains a carboxy-modified silicone oil. The second surface treatment layer contains a specific copolymer including a first repeating unit represented by general formula (I) shown below and a second repeating unit represented by general formula (II) shown below. The silica particles have a non-ring-opened oxazoline group content of at least 1 ?mol/g and no greater than 500 ?mol/g as measured by gas chromatography-mass spectrometry.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: January 28, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Ryotaro Komada
  • Publication number: 20190377276
    Abstract: A toner includes toner particles each including a toner mother particle and an external additive adhering to a surface of the toner mother particle. The external additive includes silica particles. The silica particles each include a silica base, a first surface treatment layer covering the silica base, and a second surface treatment layer covering the first surface treatment layer. The first surface treatment layer contains a carboxy-modified silicone oil. The second surface treatment layer contains a specific copolymer including a first repeating unit represented by general formula (I) shown below and a second repeating unit represented by general formula (II) shown below. The silica particles have a non-ring-opened oxazoline group content of at least 1 ?mol/g and no greater than 500 ?mol/g as measured by gas chromatography-mass spectrometry.
    Type: Application
    Filed: May 30, 2019
    Publication date: December 12, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Ryotaro KOMADA
  • Patent number: 10394150
    Abstract: A positively chargeable toner includes a plurality of toner particles. The toner particles each include a toner mother particle and an external additive. The toner mother particle includes a toner core containing a binder resin and a shell layer covering a surface of the toner core. The external additive includes a plurality of silica particles. The silica particles are each present on a surface of the shell layer and include a silica base having a surface treated with a surface treatment agent. The surface treatment agent includes a first treatment agent having a carboxyl group in a molecule thereof. The toner core and each of the silica particles is bonded to each other through a specific covalent bond. An amount of ring-unopened oxazoline groups included in 1 g of the positively chargeable toner as measured by gas chromatography-mass spectrometry is at least 0.10 ?mol and no greater than 100 ?mol.
    Type: Grant
    Filed: October 8, 2018
    Date of Patent: August 27, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Ryotaro Komada
  • Patent number: 10345727
    Abstract: A positively chargeable toner includes a plurality of toner particles each including a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes first resin particles each having a surface to which a cationic surfactant is attached and second resin particles each having a surface to which a cationic surfactant is attached. The first resin particles have a hydrophobicity of at least 15% and no greater than 30%. The second resin particles have a hydrophobicity of at least 50% and no greater than 80%. A first resin particle coverage ratio and a second resin particle coverage ratio each are at least 10% and no greater than 30%. Each blocking rate of the first resin particles and the second resin particles is no greater than 30% by mass.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: July 9, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Ryotaro Komada
  • Patent number: 10295923
    Abstract: An electrostatic latent image developing toner includes toner particles each including a toner core and a shell layer covering a surface of the toner core. The shell layer contains a hydrophilic thermosetting resin and a hydrophobic thermoplastic resin. The hydrophobic thermoplastic resin is exposed at surfaces of the toner particles. In a preferable configuration of the shell layer, a plurality of blocks substantially formed from the hydrophobic thermoplastic resin are connected to one another through a junction portion substantially formed from the hydrophilic thermosetting resin.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: May 21, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masami Tsujihiro, Jun Hioki, Haruhiro Nishitera, Ryotaro Komada
  • Patent number: 10281832
    Abstract: A positively chargeable toner includes toner particles each including a toner mother particle and an external additive adhering to a surface of the toner mother particle. The external additive includes first resin particles each having a surface to which a cationic surfactant adheres and second resin particles each having a surface to which an anionic surfactant adheres. Respective number average primary particle diameters of the first resin particles and the second resin particles are at least 60 nm and no greater than 100 nm. A detachment ratio of the first resin particles in a dispersion of the toner subjected to five-minute ultrasonic treatment is no greater than 20% in terms of a peak intensity percentage in a fluorescent X-ray spectrum plotted for the dispersion of the toner. A detachment ratio of the second resin particles in the dispersion is at least 30% and no greater than 60% in terms thereof.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: May 7, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Ryotaro Komada
  • Publication number: 20190121252
    Abstract: A positively chargeable toner includes a plurality of toner particles. The toner particles each include a toner mother particle and an external additive. The toner mother particle includes a toner core containing a binder resin and a shell layer covering a surface of the toner core. The external additive includes a plurality of silica particles. The silica particles are each present on a surface of the shell layer and include a silica base having a surface treated with a surface treatment agent. The surface treatment agent includes a first treatment agent having a carboxyl group in a molecule thereof. The toner core and each of the silica particles is bonded to each other through a specific covalent bond. An amount of ring-unopened oxazoline groups included in 1 g of the positively chargeable toner as measured by gas chromatography-mass spectrometry is at least 0.10 ?mol and no greater than 100 ?mol.
    Type: Application
    Filed: October 8, 2018
    Publication date: April 25, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Ryotaro KOMADA
  • Publication number: 20190086826
    Abstract: A positively chargeable toner includes a plurality of toner particles each including a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes first resin particles each having a surface to which a cationic surfactant is attached and second resin particles each having a surface to which a cationic surfactant is attached. The first resin particles have a hydrophobicity of at least 15% and no greater than 30%. The second resin particles have a hydrophobicity of at least 50% and no greater than 80%. A first resin particle coverage ratio and a second resin particle coverage ratio each are at least 10% and no greater than 30%. Each blocking rate of the first resin particles and the second resin particles is no greater than 30% by mass.
    Type: Application
    Filed: September 12, 2018
    Publication date: March 21, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Ryotaro KOMADA
  • Publication number: 20180356747
    Abstract: An electrostatic latent image developing toner includes toner particles each including a toner core and a shell layer covering a surface of the toner core. The shell layer contains a hydrophilic thermosetting resin and a hydrophobic thermoplastic resin. The hydrophobic thermoplastic resin is exposed at surfaces of the toner particles. In a preferable configuration of the shell layer, a plurality of blocks substantially formed from the hydrophobic thermoplastic resin are connected to one another through a junction portion substantially formed from the hydrophilic thermosetting resin.
    Type: Application
    Filed: December 22, 2015
    Publication date: December 13, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Masami TSUJIHIRO, Jun HIOKI, Haruhiro NISHITERA, Ryotaro KOMADA
  • Patent number: 10139744
    Abstract: An electrostatic latent image developing toner includes toner particles each including a toner core (10) and a shell layer (20) covering a surface of the toner core (10). The shell layer (20) contains a hydrophilic thermosetting resin and a hydrophobic thermoplastic resin. The hydrophilic thermosetting resin is a resin having at least one functional group selected from the group consisting of oxazoline groups, carbodiimide groups, and isocyanate groups. The hydrophobic thermoplastic resin is exposed at surfaces of the toner particle.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: November 27, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Hioki, Ryotaro Komada, Haruhiro Nishitera, Yusuke Washino
  • Publication number: 20180314174
    Abstract: A positively chargeable toner includes toner particles each including a toner mother particle and an external additive adhering to a surface of the toner mother particle. The external additive includes first resin particles each having a surface to which a cationic surfactant adheres and second resin particles each having a surface to which an anionic surfactant adheres. Respective number average primary particle diameters of the first resin particles and the second resin particles are at least 60 nm and no greater than 100 nm. A detachment ratio of the first resin particles in a dispersion of the toner subjected to five-minute ultrasonic treatment is no greater than 20% in terms of a peak intensity percentage in a fluorescent X-ray spectrum plotted for the dispersion of the toner. A detachment ratio of the second resin particles in the dispersion is at least 30% and no greater than 60% in terms thereof.
    Type: Application
    Filed: April 25, 2018
    Publication date: November 1, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Ryotaro KOMADA
  • Patent number: 9857712
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a core and a shell layer. The shell layer is disposed over a surface of the core. The shell layer is substantially formed by a resin. The shell layer has a surface including a plurality of spot regions and a sheet region that is more hydrophobic than the spot regions. The spot regions each are more chargeable than the sheet region.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: January 2, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masami Tsujihiro, Jun Hioki, Ryotaro Komada, Yusuke Washino, Haruhiro Nishitera
  • Publication number: 20170371259
    Abstract: An electrostatic latent image developing toner includes toner particles each including a toner core (10) and a shell layer (20) covering a surface of the toner core (10). The shell layer (20) contains a hydrophilic thermosetting resin and a hydrophobic thermoplastic resin. The hydrophilic thermosetting resin is a resin having at least one functional group selected from the group consisting of oxazoline groups, carbodiimide groups, and isocyanate groups. The hydrophobic thermoplastic resin is exposed at surfaces of the toner particle.
    Type: Application
    Filed: January 7, 2016
    Publication date: December 28, 2017
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun HIOKI, Ryotaro KOMADA, Haruhiro NISHITERA, Yusuke WASHINO
  • Patent number: 9740127
    Abstract: A toner includes a plurality of toner particles each including a toner core and a shell layer disposed over the surface of the toner core. The shell layer includes a thermosetting portion substantially composed of a water-insoluble thermosetting resin and a thermoplastic portion substantially composed of a water-insoluble thermoplastic resin. At least a part of the thermoplastic portion has a shape of a film with projections and recesses and is located on the surface of the toner core. At least a part of the thermosetting portion is located on the thermoplastic portion. The part of the thermosetting portion located on the thermoplastic portion has a shape of a film along the shape of the thermoplastic portion.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: August 22, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Ryotaro Komada, Masami Tsujihiro, Jun Hioki, Hideharu Hori
  • Patent number: 9500973
    Abstract: For at least 80% of toner particles in a toner, along at least 80% of circumferential length of a toner particle cross-section, a shell layer has a thickness of at least 5 nm and satisfies a condition that a ratio of an intensity INc relative to an intensity INs is no greater than 0.2. For at least 80% of the toner particles in the toner, along at least 80% of the circumferential length of the toner particle cross-section, the shell layer has a thickness of at least 5 nm and satisfies a condition that a ratio of an intensity ISc relative to an intensity ISs is no greater than 0.2.
    Type: Grant
    Filed: October 3, 2014
    Date of Patent: November 22, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masami Tsujihiro, Ryotaro Komada
  • Publication number: 20160274479
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a core and a shell layer. The shell layer is disposed over a surface of the core. The shell layer is substantially formed by a resin. The shell layer has a surface including a plurality of spot regions and a sheet region that is more hydrophobic than the spot regions. The spot regions each are more chargeable than the sheet region.
    Type: Application
    Filed: March 16, 2016
    Publication date: September 22, 2016
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Masami TSUJIHIRO, Jun HIOKI, Ryotaro KOMADA, Yusuke WASHINO, Haruhiro NISHITERA
  • Publication number: 20160252835
    Abstract: A toner includes a plurality of toner particles each including a toner core and a shell layer disposed over the surface of the toner core. The shell layer includes a thermosetting portion substantially composed of a water-insoluble thermosetting resin and a thermoplastic portion substantially composed of a water-insoluble thermoplastic resin. At least a part of the thermoplastic portion has a shape of a film with projections and recesses and is located on the surface of the toner core. At least a part of the thermosetting portion is located on the thermoplastic portion. The part of the thermosetting portion located on the thermoplastic portion has a shape of a film along the shape of the thermoplastic portion.
    Type: Application
    Filed: February 19, 2016
    Publication date: September 1, 2016
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Ryotaro KOMADA, Masami TSUJIHIRO, Jun HIOKI, Hideharu HORI
  • Patent number: 9383670
    Abstract: A toner includes a plurality of toner particles each having a core and a shell layer on a surface of the core. In a cross section of the toner particle analyzed by EELS, for at least 50% of a circumferential length of the core, the shell layer has one or more portions each satisfying conditions that: a ratio of INc to INs is no less than 0.0 and no greater than 0.2; and a thickness of the shell layer is at least 5 nm. Here, INs indicates an intensity of an N-K shell absorption-edge originating from nitrogen atoms in the shell layer, and INc indicates an intensity of an N-K shell absorption-edge originating from nitrogen atoms in the core. In addition, the longest length among the one or more portions of the shell layer each satisfying the conditions is at least 100 nm.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: July 5, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masami Tsujihiro, Ryotaro Komada
  • Patent number: 9329509
    Abstract: An electrostatic latent image developing toner contains toner particles each including a toner core containing a binder resin, and a shell layer coating the surface of the tore core. The shell layer contains a unit derived from a monomer of a thermosetting resin, and a unit derived from a thermoplastic resin. The resin contained in the shell layer has a unit derived from one or more monomers of thermosetting resins selected from the group of amino resins consisting of a melamine resin, a urea resin, and a glyoxal resin.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: May 3, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Yoshio Ozawa, Naruo Yabe, Masami Tsujihiro, Ryotaro Komada
  • Patent number: 9304426
    Abstract: The present disclosure relates to an electrostatic latent image developing toner containing a toner particle including a toner core containing a binder resin and a shell layer coating a surface of the toner core. The shell layer contains a unit derived from a monomer of a thermosetting resin, and a unit derived from a thermoplastic resin. The thermosetting resin is one or more resins selected from the group of amino resins consisting of a melamine resin, a urea resin, and a glyoxal resin. The toner particle contains fine particles in an interfacial portion between the toner core and the shell layer, and the fine particles have a charge property opposite to that of the toner, or have a volume resistivity lower than both a volume resistivity of the binder resin and a volume resistivity of the shell layer.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: April 5, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Yoshio Ozawa, Masami Tsujihiro, Toru Takatsuna, Ryotaro Komada