Patents by Inventor Daiji Okamura

Daiji Okamura 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: 10301495
    Abstract: To provide an ink jet recording method excellent in a fixability of an image, capable of recording an image excellent in optical density, and excellent in a recoverability, when it uses a recording apparatus having a line head. This method records an image by using an ink jet recording apparatus equipped with a line head having an ejection nozzle of a pigment-containing aqueous ink and a mechanism for recovering an ejection state of the aqueous ink from the nozzle and applying the ink to a recording medium. The pigment has an average particle diameter of 80 nm or more, the ink has a dynamic surface tension of 55 mN/m or less at a lifetime of 10 milliseconds, the recovery mechanism includes a mechanism for causing the ink in the nozzle to flow, and the viscosity of the ink in the nozzle is reduced.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: May 28, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Daiji Okamura
  • 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
  • Patent number: 10125284
    Abstract: An aqueous ink for ink jet, the aqueous ink including a pigment and a resin for dispersing the pigment. The pigment is impregnated with a compound having a structure in which at least two structures each represented by General Formula (1) are bonded by a glycoside bond.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: November 13, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Keigo Gouda, Shin-ichi Hakamada, Hisao Kamo, Hitoshi Nagashima, Daiji Okamura, Takakazu Mizutani, Masahito Miyabe, Isamu Oguri, Kouichirou Okumura
  • 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
  • Publication number: 20170348967
    Abstract: To provide an ink jet recording method excellent in a fixability of an image, capable of recording an image excellent in optical density, and excellent in a recoverability, when it uses a recording apparatus having a line head. This method records an image by using an ink jet recording apparatus equipped with a line head having an ejection nozzle of a pigment-containing aqueous ink and a mechanism for recovering an ejection state of the aqueous ink from the nozzle and applying the ink to a recording medium. The pigment has an average particle diameter of 80 nm or more, the ink has a dynamic surface tension of 55 mN/m or less at a lifetime of 10 milliseconds, the recovery mechanism includes a mechanism for causing the ink in the nozzle to flow, and the viscosity of the ink in the nozzle is reduced.
    Type: Application
    Filed: May 26, 2017
    Publication date: December 7, 2017
    Inventor: Daiji Okamura
  • Publication number: 20170335125
    Abstract: An aqueous ink for ink jet, the aqueous ink including a pigment and a resin for dispersing the pigment. The pigment is impregnated with a compound having a structure in which at least two structures each represented by General Formula (1) are bonded by a glycoside bond.
    Type: Application
    Filed: May 16, 2017
    Publication date: November 23, 2017
    Inventors: Keigo Gouda, Shin-ichi Hakamada, Hisao Kamo, Hitoshi Nagashima, Daiji Okamura, Takakazu Mizutani, Masahito Miyabe, Isamu Oguri, Kouichirou Okumura
  • 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: 8960878
    Abstract: An ink jet ink containing a pigment and a polyurethane polymer, wherein the polyurethane polymer has units derived from a polyol having no acid group and having the carbon number of 13 or more and 250 or less, a diol having an acid group and having the carbon number of 1 or more and 7 or less, a polyol having a siloxane structure, and a polyisocyanate, and an acid value of the polyurethane polymer is 40.0 mgKOH/g or more and 80.0 mgKOH/g or less.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: February 24, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirofumi Ichinose, Daiji Okamura, Kousuke Yamasaki, Mitsuru Ishii, Yuuki Nishino, Hiroshi Tomioka
  • Publication number: 20140378609
    Abstract: An ink for ink jet contains a pigment and a urethane resin. The pigment is at least one of a pigment the particles of which have an anionic group bonded to their surface directly or via another atomic group and a pigment dispersed by a resin having an anionic unit and different from the urethane resin. The urethane resin has a unit derived from a polyfunctional polyisocyanate, and this unit has at least one structure selected from the group consisting of an allophanate structure that has added a monohydric alcohol containing 1 to 5 carbon atoms, a uretdione structure, an isocyanurate structure, and a biuret structure. The acid value of the urethane resin is less than 10 mg KOH/g.
    Type: Application
    Filed: June 18, 2014
    Publication date: December 25, 2014
    Inventors: Kousuke Yamasaki, Daiji Okamura
  • Patent number: 8911071
    Abstract: An ink jet ink includes a pigment and a polyurethane polymer having units derived from a polyisocyanate, a polyol, and a diol having an acid group, and in the ink jet ink described above, an acid value of the polyurethane polymer is 20 mgKOH/g or more and 100 mgKOH/g or less, the unit derived from the polyisocyanate includes a unit derived from a compound represented by the following general formula (I), and the proportion of the unit derived from the compound represented by the general formula (I) in the unit derived from the polyisocyanate is 90 percent by mole or less.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: December 16, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuuki Nishino, Daiji Okamura, Kousuke Yamasaki, Mitsuru Ishii, Hirofumi Ichinose, Hiroshi Tomioka
  • Patent number: 8757776
    Abstract: An ink to be applied to a recording head having a common liquid chamber, pressure chambers developing pressure applied to the liquid, individual channels through which the liquid is introduced into the pressure chambers from the common liquid chamber, and a group of nozzles which communicate with the pressure chambers and eject the liquid, where first nozzles having short individual channels and second nozzles having long ones are alternately arranged at arrangement intervals of less than 30 ?m along one side or sides of the common liquid chamber, contains an aqueous medium, a surfactant and a coloring material. The aqueous medium consists of water and a water-soluble organic compound containing at least one alkanediol and has a surface tension of from 40 mN/m or more to less than 60 mN/m in an environment of temperature 25° C. and humidity 50%.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: June 24, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Yamakami, Daiji Okamura, Hiroshi Tomioka, Chiaki Muraoka, Masaki Oikawa
  • Patent number: 8757788
    Abstract: An ink jet ink contains a self-dispersing pigment and a polyurethane polymer. The polyurethane polymer has units derived from a polyisocyanate, a polyol having no acid group, and a diol having an acid group. The polyurethane polymer has a cross-linked structure and an acid value of the polyurethane polymer is 60 mgKOH/g or more and 100 mgKOH/g or less.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: June 24, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daiji Okamura, Kousuke Yamasaki, Mitsuru Ishii, Yuuki Nishino, Yoichi Takada, Hirofumi Ichinose, Hiroshi Tomioka