Patents by Inventor Kenichi Shiiba

Kenichi Shiiba 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: 10280323
    Abstract: Provided is an aqueous ink that enables the recording of images having high optical density and excellent toughness and has excellent reliability. An aqueous ink for ink jet includes a pigment, a resin having an anionic group, a salt and a water-soluble organic solvent. The pigment is a self-dispersible pigment in which an anionic group is bonded to the particle surface of carbon black directly or through another atomic group, the resin has a weight-average molecular weight of 20,000 or less, the water-soluble organic solvent includes glycerol and an additional solvent other than glycerol, and the content (% by mass) of the additional solvent relative to the content (% by mass) of glycerol in terms of mass ratio is 0.6 times or less.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: May 7, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kuniaki Fujimoto, Kenji Moribe, Kenichi Shiiba, Yuki Nishino
  • Patent number: 10259963
    Abstract: To provide an aqueous ink that can suppress the dissolution of silicon or a silicon compound contained in a recording head, can be stably, continuously ejected for a long time, and enables the recording of an image having excellent glossiness. An aqueous ink for ink jet includes a pigment, a resin dispersant for dispersing the pigment, an alkanolamine and a urethane resin. The pigment is a solid solution containing C.I. Pigment Red 122 and C.I. Pigment Violet 19, and the proportion (% by mass) of the C.I. Pigment Red 122 is 10% by mass or more to 90% by mass or less based on the total mass of the solid solution.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: April 16, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Aiko Masada, Kenichi Shiiba, Yuki Nishino, Kenji Moribe
  • Patent number: 10253197
    Abstract: To provide an aqueous ink for ink jet enabling the recording of an image having excellent character quality and excellent highlighter resistance immediately after the recording. An aqueous ink for ink jet includes a pigment and a urethane resin. The urethane resin has a unit derived from a polyisocyanate, a unit derived from a polyol having no acid group and a unit derived from a polyol having an acid group, the proportion of a unit derived from the polyol having an acid group present at the molecular terminal relative to the whole unit derived from the polyol having an acid group is 30% or less, and the aqueous ink has a dynamic surface tension of 55 mN/m or more at a lifetime of 10 msec.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: April 9, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Shiiba, Kenji Moribe, Daiji Okamura, Kousuke Yamasaki
  • Publication number: 20180258302
    Abstract: To provide an aqueous ink that can suppress the dissolution of silicon or a silicon compound contained in a recording head, can be stably, continuously ejected for a long time, and enables the recording of an image having excellent glossiness. An aqueous ink for ink jet includes a pigment, a resin dispersant for dispersing the pigment, an alkanolamine and a urethane resin. The pigment is a solid solution containing C.I. Pigment Red 122 and C.I. Pigment Violet 19, and the proportion (% by mass) of the C.I. Pigment Red 122 is 10% by mass or more to 90% by mass or less based on the total mass of the solid solution.
    Type: Application
    Filed: March 6, 2018
    Publication date: September 13, 2018
    Inventors: Aiko Masada, Kenichi Shiiba, Yuki Nishino, Kenji Moribe
  • Publication number: 20180258299
    Abstract: Provided is an aqueous ink that enables the recording of images having high optical density and excellent toughness and has excellent reliability. An aqueous ink for ink jet includes a pigment, a resin having an anionic group, a salt and a water-soluble organic solvent. The pigment is a self-dispersible pigment in which an anionic group is bonded to the particle surface of carbon black directly or through another atomic group, the resin has a weight-average molecular weight of 20,000 or less, the water-soluble organic solvent includes glycerol and an additional solvent other than glycerol, and the content (% by mass) of the additional solvent relative to the content (% by mass) of glycerol in terms of mass ratio is 0.6 times or less.
    Type: Application
    Filed: March 6, 2018
    Publication date: September 13, 2018
    Inventors: Kuniaki Fujimoto, Kenji Moribe, Kenichi Shiiba, Yuki Nishino
  • Publication number: 20180258298
    Abstract: To provide an aqueous ink for ink jet enabling the recording of an image having excellent character quality and excellent highlighter resistance immediately after the recording. An aqueous ink for ink jet includes a pigment and a urethane resin. The urethane resin has a unit derived from a polyisocyanate, a unit derived from a polyol having no acid group and a unit derived from a polyol having an acid group, the proportion of a unit derived from the polyol having an acid group present at the molecular terminal relative to the whole unit derived from the polyol having an acid group is 30% or less, and the aqueous ink has a dynamic surface tension of 55 mN/m or more at a lifetime of 10 msec.
    Type: Application
    Filed: March 2, 2018
    Publication date: September 13, 2018
    Inventors: Kenichi Shiiba, Kenji Moribe, Daiji Okamura, Kousuke Yamasaki
  • Patent number: 9505941
    Abstract: An ink used for an inkjet recording method for discharging the ink from a recording head by an action of thermal energy contains self-dispersing carbon black, a polyurethane polymer having an acid value of 40 mg KOH/g or more, and an acryl polymer having an acid value of 100 mg KOH/g or more and 200 mg KOH/g or less.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: November 29, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shin-ichi Hakamada, Daiji Okamura, Kousuke Yamasaki, Yuki Nishino, Kenichi Shiiba
  • Patent number: 9499704
    Abstract: An aqueous ink for ink jet contains a urethane resin. The urethane resin has a unit derived from a polyether polyol and a unit containing an acidic group. The acid value of the urethane resin is 40 to 140 mg KOH/g. The molar ratio of urethane bonds/urea bonds is 80.0/20.0 or more. Some of the acidic groups in the urethane resin are neutralized with particular neutralizing agents.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: November 22, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daiji Okamura, Kousuke Yamasaki, Kenichi Shiiba
  • Patent number: 9452608
    Abstract: The invention provides an ink containing a polyurethane polymer which has units respectively derived from a polyisocyanate, a polyether polyol having no acid group and a diol having an acid group and has an acid value of 40 mg KOH/g or more and 140 mg KOH/g or less, a carbon black and at least one antioxidant selected from compounds represented by the general formulae (1) to (3).
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: September 27, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daiji Okamura, Kousuke Yamasaki, Kenichi Shiiba
  • Patent number: 9387679
    Abstract: An ink jet recording method for recording an image onto a recording medium by ejecting an aqueous ink containing a resin from an ejection orifice through use of an ink jet recording apparatus including a recording head having a water-repellent face subjected to water-repellent treatment as an ejection orifice face provided with an ejection orifice; a wiping unit configured to wipe the water-repellent face; and a heating unit configured to heat the water-repellent face, the ink jet recording method including a heating step of wiping the water-repellent face with the wiping unit after heating the water-repellent face with the heating unit and continuously heating the water-repellent face until after the wiping of the water-repellent face.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: July 12, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenichi Shiiba, Masashi Ogasawara, Daiji Okamura, Kousuke Yamasaki, Atsushi Takahashi, Tomoyuki Tenkawa
  • Patent number: 9243155
    Abstract: An ink jet ink contains a polyurethane polymer and a self-dispersing pigment. The polyurethane polymer has units derived from a polyisocyanate, a polyol having no acid group, and a diol having an acid group. The molar ratio of the percentage of the urethane bond in the polyurethane polymer to the percentage of the urea bond in the polyurethane polymer is 85.0/15.0 or more and 100.0/0 or less. The ink jet ink may be capable of producing an image having high optical density, scratch resistance, and highlighter resistance, and which has excellent ink ejection stability and can reduce image deflection caused by face wetting.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: January 26, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daiji Okamura, Kousuke Yamasaki, Kenji Moribe, Kouichirou Okumura, Kenichi Shiiba, Hiromitsu Kishi
  • Patent number: 9169413
    Abstract: The invention provides an ink containing a self-dispersion pigment in which a phosphonic acid group is bonded directly or through another atomic group to the surface thereof and a polyurethane polymer, wherein the surface charge amount of the self-dispersion pigment is 0.25 mmol/g or more and 0.42 mmol/g or less, and the polyurethane polymer has units respectively derived from a polyisocyanate, a polyether polyol having no acid group and a diol having an acid group.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: October 27, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Shiiba, Daiji Okamura, Kousuke Yamasaki
  • Publication number: 20150183220
    Abstract: An ink jet recording method for recording an image onto a recording medium by ejecting an aqueous ink containing a resin from an ejection orifice through use of an ink jet recording apparatus including a recording head having a water-repellent face subjected to water-repellent treatment as an ejection orifice face provided with an ejection orifice; a wiping unit configured to wipe the water-repellent face; and a heating unit configured to heat the water-repellent face, the ink jet recording method including a heating step of wiping the water-repellent face with the wiping unit after heating the water-repellent face with the heating unit and continuously heating the water-repellent face until after the wiping of the water-repellent face.
    Type: Application
    Filed: December 12, 2014
    Publication date: July 2, 2015
    Inventors: Kenichi Shiiba, Masashi Ogasawara, Daiji Okamura, Kousuke Yamasaki, Atsushi Takahashi, Tomoyuki Tenkawa
  • Publication number: 20150159031
    Abstract: An aqueous ink for ink jet contains a urethane resin. The urethane resin has a unit derived from a polyether polyol and a unit containing an acidic group. The acid value of the urethane resin is 40 to 140 mg KOH/g. The molar ratio of urethane bonds/urea bonds is 80.0/20.0 or more. Some of the acidic groups in the urethane resin are neutralized with particular neutralizing agents.
    Type: Application
    Filed: December 3, 2014
    Publication date: June 11, 2015
    Inventors: Daiji Okamura, Kousuke Yamasaki, Kenichi Shiiba
  • Patent number: 8991993
    Abstract: An ink used for an inkjet recording method for discharging the ink from a recording head by an action of thermal energy contains self-dispersing carbon black, a polyurethane polymer having an acid value of 40 mg KOH/g or more, and polyethylene glycol.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: March 31, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuki Nishino, Shin-ichi Hakamada, Kousuke Yamasaki, Kenichi Shiiba, Daiji Okamura
  • Patent number: 8690307
    Abstract: An ink jet ink contains a polyurethane polymer and a pigment. The polyurethane polymer has units derived from a polyisocyanate, a polyether polyol having no acid group, and a diol having an acid group. The pigment is dispersed using a polymer other than the polyurethane polymer. The molar ratio of the percentage of the urethane bond in the polyurethane polymer to the percentage of the urea bond in the polyurethane polymer is 85.0/15.0 or more and 100.0/0 or less.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: April 8, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kouichirou Okumura, Kenichi Shiiba, Daiji Okamura, Kousuke Yamasaki, Kenji Moribe, Hiromitsu Kishi
  • Patent number: 8684509
    Abstract: An ink jet ink contains a polyurethane polymer and a pigment. The polyurethane polymer has units derived from a polyisocyanate, a polyether polyol having no acid group, and a diol having an acid group. The pigment is dispersed using a polymer other than the polyurethane polymer. The ratio of the percentage of the urethane bond in the polyurethane polymer to the percentage of the urea bond in the polyurethane polymer is 85.0/15.0 or more and 98.5/1.5 or less.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: April 1, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kousuke Yamasaki, Hiromitsu Kishi, Daiji Okamura, Kenji Moribe, Kouichirou Okumura, Kenichi Shiiba
  • Publication number: 20140015895
    Abstract: To provide an ink jet ink that produces an image having high optical density, scratch resistance, and highlighter resistance, has excellent ink ejection stability, and can reduce image deflection caused by face wetting. The ink jet ink contains a polyurethane polymer and a self-dispersing pigment. The polyurethane polymer has units derived from a polyisocyanate, a polyol having no acid group, and a diol having an acid group. The molar ratio of the percentage of the urethane bond in the polyurethane polymer to the percentage of the urea bond in the polyurethane polymer is 85.0/15.0 or more and 100.0/0 or less.
    Type: Application
    Filed: March 19, 2012
    Publication date: January 16, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Daiji Okamura, Kousuke Yamasaki, Kenji Moribe, Kouichirou Okumura, Kenichi Shiiba, Hiromitsu Kishi
  • Publication number: 20130300804
    Abstract: The invention provides an ink containing a polyurethane polymer which has units respectively derived from a polyisocyanate, a polyether polyol having no acid group and a diol having an acid group and has an acid value of 40 mg KOH/g or more and 140 mg KOH/g or less, a carbon black and at least one antioxidant selected from compounds represented by the general formulae (1) to (3).
    Type: Application
    Filed: April 11, 2013
    Publication date: November 14, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Daiji Okamura, Kousuke Yamasaki, Kenichi Shiiba
  • Publication number: 20130300803
    Abstract: The invention provides an ink containing a self-dispersion pigment in which a phosphonic acid group is bonded directly or through another atomic group to the surface thereof and a polyurethane polymer, wherein the surface charge amount of the self-dispersion pigment is 0.25 mmol/g or more and 0.42 mmol/g or less, and the polyurethane polymer has units respectively derived from a polyisocyanate, a polyether polyol having no acid group and a diol having an acid group.
    Type: Application
    Filed: April 11, 2013
    Publication date: November 14, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kenichi Shiiba, Daiji Okamura, Kousuke Yamasaki