Patents by Inventor Midori SEKINE

Midori SEKINE 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: 11027544
    Abstract: An ink jet method includes: a discharging step of discharging a radiation-curable ink jet composition onto a recording medium at an ink weight per dot of 22 ng/dot or less by using an ink jet head configured to discharge the radiation-curable ink jet composition and having a nozzle density of 600 npi or more; and an irradiating step of irradiating, with radiation, the radiation-curable ink jet composition attached to the recording medium. The radiation-curable ink jet composition contains polymerizable compounds including a monofunctional monomer and a multifunctional monomer. The monofunctional monomer includes a nitrogen-containing monofunctional monomer. The amount of the monofunctional monomer is 90 mass % or more relative to the total amount of the polymerizable compounds. The amount of the nitrogen-containing monofunctional monomer is from 1 to 15 mass % relative to the total amount of the polymerizable compounds.
    Type: Grant
    Filed: February 7, 2020
    Date of Patent: June 8, 2021
    Inventors: Keitaro Nakano, Kyohei Tanaka, Midori Sekine, Chigusa Sato
  • Patent number: 10953657
    Abstract: An ink jet printing apparatus includes a radiation-curable ink having a surface tension of 25.0 mN/m or less, and a printing head including a nozzle face having an opening of a nozzle through which the radiation-curable ink is ejected, and a liquid-repellent film on the nozzle face. The liquid-repellent film enables the radiation-curable ink to forms a contact angle of 60.0 degrees or more therewith.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: March 23, 2021
    Inventors: Midori Sekine, Tomohiro Numajiri, Keitaro Nakano
  • Publication number: 20210071024
    Abstract: An ink set of radiation curable ink jet inks each of which contains polymerizable compounds, includes a color ink and a clear ink, the polymerizable compounds contained in the clear ink include a monomer A having a hydroxy group and a monomer B having a volume of 0.26 nm3 or more and a height direction area of 0.25 nm2 or more with respect to a long side each of which is defined by the Van der Waals radii, and a total content of the monomer A and the monomer B is 80 percent by mass or more with respect to a total mass of the polymerizable compounds contained in the clear ink.
    Type: Application
    Filed: September 4, 2020
    Publication date: March 11, 2021
    Inventors: Kyohei TANAKA, Keitaro NAKANO, Midori SEKINE, Yuko HISHIDA
  • Patent number: 10934444
    Abstract: A radiation-curable ink jet composition includes monomers, the monomers including 86% by mass or more of one or more monofunctional monomers relative to all the monomers, where a glass transition temperature of the radiation-curable ink jet composition calculated from glass transition temperatures of all the monomers is 42° C. or higher.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: March 2, 2021
    Inventors: Kyohei Tanaka, Keitaro Nakano, Midori Sekine
  • Publication number: 20210024761
    Abstract: Provided is an ink set of radiation-curable ink jet compositions each including a polymerizable compound component. The ink set includes a color ink and a clear ink as the radiation-curable ink jet compositions. The polymerizable compound component contained in the clear ink includes a monomer A having a volume of 260 angstrom3 or more and an area of 25 angstrom2 or more in the height direction with respect to a long side defined by a van-der-Waals radius, and the content of the monomer A contained in the clear ink is 80 mass % or more based on the total amount of the polymerizable compound component.
    Type: Application
    Filed: July 24, 2020
    Publication date: January 28, 2021
    Inventors: Kyohei TANAKA, Midori SEKINE, Keitaro NAKANO, Yuko HISHIDA, Tsuyoshi SANO
  • Publication number: 20200392353
    Abstract: A radiation-curable ink jet composition that is a white ink containing a white coloring material or a pale or clear ink containing 1.2% by mass or less of a coloring material contains at least one polymerizable compound including at least one of a monofunctional monomer having a nitrogen-containing heterocyclic structure and a monomer having a hydroxy group. In the composition, the thioxanthone-based photopolymerization initiator content is limited to 0.3% or less relative to the total mass of the radiation-curable ink jet composition.
    Type: Application
    Filed: June 16, 2020
    Publication date: December 17, 2020
    Inventors: Kyohei TANAKA, Keitaro NAKANO, Midori SEKINE
  • Publication number: 20200392357
    Abstract: A radiation-curable ink jet composition includes a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component, a photopolymerization initiator, and titanium oxide as a white color material. The content of the monofunctional monomer component is 90 mass % or more based on the total amount of the polymerizable compound component, and the weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 48° C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.
    Type: Application
    Filed: June 16, 2020
    Publication date: December 17, 2020
    Inventors: Midori SEKINE, Kyohei TANAKA, Keitaro NAKANO
  • Publication number: 20200254755
    Abstract: An ink jet method includes: a discharging step of discharging a radiation-curable ink jet composition onto a recording medium at an ink weight per dot of 22 ng/dot or less by using an ink jet head configured to discharge the radiation-curable ink jet composition and having a nozzle density of 600 npi or more; and an irradiating step of irradiating, with radiation, the radiation-curable ink jet composition attached to the recording medium. The radiation-curable ink jet composition contains polymerizable compounds including a monofunctional monomer and a multifunctional monomer. The monofunctional monomer includes a nitrogen-containing monofunctional monomer. The amount of the monofunctional monomer is 90 mass % or more relative to the total amount of the polymerizable compounds. The amount of the nitrogen-containing monofunctional monomer is from 1 to 15 mass % relative to the total amount of the polymerizable compounds.
    Type: Application
    Filed: February 7, 2020
    Publication date: August 13, 2020
    Inventors: Keitaro NAKANO, Kyohei TANAKA, Midori SEKINE, Chigusa SATO
  • Publication number: 20200254784
    Abstract: An ink jet method includes: a discharging step of discharging a radiation-curable ink jet composition onto a recording medium at an ink weight per dot of 22 ng/dot or less by using an ink jet head having a nozzle density of 600 npi or more and configured to discharge the radiation-curable ink jet composition; and an irradiating step of irradiating, with radiation, the radiation-curable ink jet composition attached to the recording medium. The radiation-curable ink jet composition contains polymerizable compounds containing a monofunctional monomer and a multifunctional monomer. The monofunctional monomer includes a nitrogen-containing monofunctional monomer. The amount of the monofunctional monomer is 90 mass % or more relative to the total amount of the polymerizable compound. The amount of the nitrogen-containing monofunctional monomer is from 1 to 15 mass % relative to the total amount of the polymerizable compounds.
    Type: Application
    Filed: February 7, 2020
    Publication date: August 13, 2020
    Inventors: Chigusa SATO, Midori SEKINE, Kyohei TANAKA, Keitaro NAKANO
  • Publication number: 20200255682
    Abstract: An ink jet method uses a liquid jet head that includes a nozzle for discharging a radiation-curable ink jet composition, a pressure chamber to which the radiation-curable ink jet composition is supplied, and a circulation flow passage allowing the radiation-curable ink jet composition in the pressure chamber to circulate. The method includes discharging the heated radiation-curable ink jet composition by the liquid jet head. The radiation-curable ink jet composition includes a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component; the content of the monofunctional monomer component is 87 mass % or more based on the total amount of the polymerizable compound component; the weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 42° C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted; and the viscosity at 40° C. is 10 mPa·s or more.
    Type: Application
    Filed: February 7, 2020
    Publication date: August 13, 2020
    Inventors: Kyohei TANAKA, Midori SEKINE, Keitaro NAKANO, Chigusa SATO
  • Publication number: 20200254756
    Abstract: An ink jet method includes an ejecting step of ejecting a radiation-curable ink jet composition from an ink jet head and an irradiating step of irradiating the ejected radiation-curable ink jet composition with an ultraviolet ray at an irradiation intensity of 3 to 10 W/cm2 by using a light emitting diode. The radiation-curable ink jet composition contains monofunctional monomers including a nitrogen-containing monofunctional monomer. The amount of the nitrogen-containing monofunctional monomer relative to the total amount of the radiation-curable ink jet composition is 5 to 40 mass %.
    Type: Application
    Filed: February 7, 2020
    Publication date: August 13, 2020
    Inventors: Keitaro NAKANO, Kyohei TANAKA, Midori SEKINE, Chigusa SATO
  • Publication number: 20200255679
    Abstract: A radiation-curable ink jet composition comprises a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component. The content of the monofunctional monomer component is 87 mass % or more based on the polymerizable compound. The monofunctional monomer component includes a nitrogen-containing monofunctional monomer component, and the content of the nitrogen-containing monofunctional monomer component is 14 mass % or less based on total amount of the radiation-curable ink jet composition. The weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 42° C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.
    Type: Application
    Filed: February 7, 2020
    Publication date: August 13, 2020
    Inventors: Midori SEKINE, Kyohei TANAKA, Keitaro NAKANO
  • Publication number: 20200255678
    Abstract: A radiation-curable ink jet composition comprises a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component. The content of the monofunctional monomer component is 87 mass % or more based on the total amount of the polymerizable compound component, the monofunctional monomer component includes a monofunctional acrylate containing a polycyclic hydrocarbon group, and the weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 42° C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.
    Type: Application
    Filed: February 7, 2020
    Publication date: August 13, 2020
    Inventors: Midori SEKINE, Kyohei TANAKA, Keitaro NAKANO
  • Publication number: 20200255677
    Abstract: A radiation-curable ink jet composition contains polymerizable compounds including a monofunctional monomer and a multifunctional monomer. The amount of the monofunctional monomer is 90 mass % or more relative to the total amount of the polymerizable compounds. The weighted mean of glass transition temperatures of homopolymers of the polymerizable compounds with the content mass ratio of each of the polymerizable compounds taken as a weight is 42° C. or higher. The weighted means of SP values of the polymerizable compounds with the content mass ratio of each of the polymerizable compounds taken as a weight is from 9.5 to 10.0.
    Type: Application
    Filed: February 7, 2020
    Publication date: August 13, 2020
    Inventors: Kyohei TANAKA, Midori SEKINE, Keitaro NAKANO
  • Publication number: 20200156375
    Abstract: An ink jet printing apparatus includes a radiation-curable ink having a surface tension of 25.0 mN/m or less, and a printing head including a nozzle face having an opening of a nozzle through which the radiation-curable ink is ejected, and a liquid-repellent film on the nozzle face. The liquid-repellent film enables the radiation-curable ink to forms a contact angle of 60.0 degrees or more therewith.
    Type: Application
    Filed: November 15, 2019
    Publication date: May 21, 2020
    Inventors: Midori SEKINE, Tomohiro NUMAJIRI, Keitaro NAKANO
  • Publication number: 20200102464
    Abstract: A radiation-curable ink jet composition includes monomers, the monomers including 86% by mass or more of one or more monofunctional monomers relative to all the monomers, where a glass transition temperature of the radiation-curable ink jet composition calculated from glass transition temperatures of all the monomers is 42° C. or higher.
    Type: Application
    Filed: September 25, 2019
    Publication date: April 2, 2020
    Inventors: Kyohei TANAKA, Keitaro NAKANO, Midori SEKINE