Patents by Inventor Hidefumi Nagashima

Hidefumi Nagashima 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: 10829655
    Abstract: Provided is an ink including water, organic solvents, a color material, and resin particles, wherein the ink is used in a printing method including applying the ink onto a substrate including a resin to print, and the organic solvents include a compound, a diol compound including 3 or 4 carbon atoms, and 2-ethylhexyl alcohol, where the compound has a boiling point of 170° C. or higher and an absolute value of a difference between Fh of the compound represented by Mathematical Formula 1 and Fh of the resin in the substrate represented by Mathematical Formula 1 is 5% or less, Fh(%)=[?H/(?D+?P+?H)]×100??<Mathematical Formula 1> where, in Mathematical Formula 1, ?H is a hydrogen bond term of the Hansen solubility parameter, ?D is a dispersion term of the Hansen solubility parameter, and ?P is a polarity term of the Hansen solubility parameter.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: November 10, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Masahiro Kido, Juichi Furukawa, Hidefumi Nagashima, Yukihiro Imanaga
  • Publication number: 20200115579
    Abstract: An ink containing water, an organic solvent, at least two kinds of resin particles, and at least one compound selected from application formulae (1) and (2). Ink-jetting recording method, and record thereof. Described inks have high adhesiveness for various substrates, and have one or more of high rub fastness, solvent resistance, and non-transfer properties, and further have high image hardness and high glossiness.
    Type: Application
    Filed: December 10, 2019
    Publication date: April 16, 2020
    Inventors: Masahiro KIDO, Naohiro TODA, Juichi FURUKAWA, Hidefumi NAGASHIMA, Tomohiro NAKAGAWA, Noriaki OKADA, Hikaru KOBAYASHI
  • Publication number: 20200095437
    Abstract: To provide an active-energy-ray-curable composition including a resin, where a ratio S3/S30 of the active-energy-ray-curable composition is 0.3 or more but 0.6 or less in a 1H-NMR spectrum of the active-energy-ray-curable composition, the 1H-NMR spectrum is obtained when a concentration of the active-energy-ray-curable composition in deuterated chloroform as a solvent is 3% by mass, the S30 is an integrated value of all signals in the 1H-NMR spectrum, and the S3 is an integrated value of at least one broad signal in the 1H-NMR spectrum.
    Type: Application
    Filed: December 20, 2017
    Publication date: March 26, 2020
    Inventors: Yuri HAGA, Mio KUMAI, Hidefumi NAGASHIMA, Maiko KOEDA
  • Patent number: 10519331
    Abstract: Provided is an ink containing water, a plurality of organic solvents, a color material, and resin particles, wherein the plurality of organic solvents contain at least one compound having a hydrogen bond term ?H, which is a Hansen solubility parameter, of 4.1 MPa1/2 or higher but 9.5 MPa1/2 or lower and a boiling point of 170° C. or higher and at least one diol compound containing 3 or 4 carbon atoms.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: December 31, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Kido, Hidefumi Nagashima, Juichi Furukawa, Yuta Nakamura
  • Publication number: 20190345356
    Abstract: Provided is an ink containing water, a plurality of organic solvents, a color material, and resin particles, wherein the plurality of organic solvents contain at least one compound having a hydrogen bond term ?H, which is a Hansen solubility parameter, of 4.1 MPa1/2 or higher but 9.5 MPa1/2 or lower and a boiling point of 170° C. or higher and at least one diol compound containing 3 or 4 carbon atoms.
    Type: Application
    Filed: July 23, 2019
    Publication date: November 14, 2019
    Inventors: Masahiro KIDO, Hidefumi NAGASHIMA, Juichi FURUKAWA, Yuta NAKAMURA
  • Patent number: 10435575
    Abstract: Provided is an ink containing water, a plurality of organic solvents, a color material, and resin particles, wherein the plurality of organic solvents contain at least one compound having a hydrogen bond term ?H, which is a Hansen solubility parameter, of 4.1 MPa1/2 or higher but 9.5 MPa1/2 or lower and a boiling point of 170° C. or higher and at least one diol compound containing 3 or 4 carbon atoms.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: October 8, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Kido, Hidefumi Nagashima, Juichi Furukawa, Yuta Nakamura
  • Publication number: 20190300731
    Abstract: An ink contains a water-soluble organic solvent, a glittery pigment having a median size less than 300 nm, and a polycarbonate-based urethane resin.
    Type: Application
    Filed: March 27, 2019
    Publication date: October 3, 2019
    Inventors: Hidefumi NAGASHIMA, Mio KUMAI, Yuri HAGA
  • Patent number: 10399363
    Abstract: A print method includes applying a first ink to a recording medium to form a first ink print layer, drying the first ink print layer to a drying ratio of 30 percent or less, and applying a second ink having a color different from that of the first ink to the first ink print layer to form a second ink print layer thereon, wherein the first ink includes a urethane resin particle and a water-soluble organic solvent having a boiling point of from 100 to 180 degrees C. or ?-alkoxy propionamide of Chemical formula I, where R1 represents a methyl group, an ethyl group, a propyl group, or a butyl group and R2 and R3 each, independently represent alkyl groups having one to six carbon atoms, and the first ink and the second ink includes no organic solvent having a boiling point of 280 degrees C. or higher under 1 atm.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: September 3, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Juichi Furukawa, Masaaki Tsuda, Hidefumi Nagashima, Yukihiro Imanaga, Masahiro Kido, Hikaru Kobayashi, Yuta Nakamura
  • Publication number: 20190256727
    Abstract: An image forming method includes applying a pre-processing fluid to a recording medium and applying an ink to the recording medium to form an image thereon, wherein the ink comprises a magenta ink comprising water, an azo pigment, a quinacridone pigment, and an organic solvent.
    Type: Application
    Filed: February 7, 2019
    Publication date: August 22, 2019
    Inventors: Mio KUMAI, Akiyoshi SABU, Atsushi YAMAMOTO, Azumi MIYAAKE, Hidefumi NAGASHIMA, Yuri HAGA
  • Publication number: 20180320011
    Abstract: Provided is an ink including water, organic solvents, a color material, and resin particles, wherein the ink is used in a printing method including applying the ink onto a substrate including a resin to print, and the organic solvents include a compound, a diol compound including 3 or 4 carbon atoms, and 2-ethylhexyl alcohol, where the compound has a boiling point of 170° C. or higher and an absolute value of a difference between Fh of the compound represented by Mathematical Formula 1 and Fh of the resin in the substrate represented by Mathematical Formula 1 is 5% or less, Fh(%)=[?H/(?D+?P+?H)]×100??<Mathematical Formula 1> where, in Mathematical Formula 1, ?H is a hydrogen bond term of the Hansen solubility parameter, ?D is a dispersion term of the Hansen solubility parameter, and ?P is a polarity term of the Hansen solubility parameter.
    Type: Application
    Filed: July 10, 2018
    Publication date: November 8, 2018
    Inventors: Masahiro KIDO, Juichi Furukawa, Hidefumi Nagashima, Yukihiro Imanaga
  • Patent number: 10119042
    Abstract: An ink including: water; at least one organic solvent; a polysiloxane surfactant; and acryl-silicone resin particles, where the polysiloxane surfactant has an HLB value of 8 or less.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: November 6, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Kido, Juichi Furukawa, Hidefumi Nagashima, Yuta Nakamura, Masaaki Tsuda, Hikaru Kobayashi, Yukihiro Imanaga, Michihiko Namba, Hiroaki Takahashi, Takahiro Yoshida
  • Patent number: 9982151
    Abstract: An aqueous ink for inkjet includes water, at least one hydrosoluble organic solvent each having a boiling point of 250° C. or lower; vinyl polymer particles containing a pigment, and polycarbonate-based urethane resin particles, wherein the aqueous ink for inkjet is used for an inkjet recording system including a heating step.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: May 29, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hidefumi Nagashima, Naohiro Toda, Tomohiro Nakagawa, Juichi Furukawa, Ichiroh Fujii
  • Publication number: 20180127610
    Abstract: Provided is an ink containing water, a plurality of organic solvents, a color material, and resin particles, wherein the plurality of organic solvents contain at least one compound having a hydrogen bond term ?H, which is a Hansen solubility parameter, of 4.1 MPa1/2 or higher but 9.5 MPa1/2 or lower and a boiling point of 170° C. or higher and at least one diol compound containing 3 or 4 carbon atoms.
    Type: Application
    Filed: June 3, 2016
    Publication date: May 10, 2018
    Inventors: Masahiro KIDO, Hidefumi NAGASHIMA, Juichi FURUKAWA, Yuta NAKAMURA
  • Patent number: 9868288
    Abstract: A cleaning liquid for an inkjet recording apparatus is provided. The cleaning liquid includes an organic solvent having a boiling point of less than 250° C. and no organic solvent having a boiling point of 250° C. or more. The organic solvent having a boiling point of less than 250° C. includes two or more methoxy-group-containing organic solvents and at least one of 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, and 2,3-butanediol.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: January 16, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hidefumi Nagashima, Naohiro Toda, Juichi Furukawa, Masahiro Kido, Takashi Tamai, Ichiroh Fujii, Hisashi Habashi
  • Publication number: 20180001669
    Abstract: A print method includes applying a first ink to a recording medium to form a first ink print layer, drying the first ink print layer to a drying ratio of 30 percent or less, and applying a second ink having a color different from that of the first ink to the first ink print layer to form a second ink print layer thereon, wherein the first ink includes a urethane resin particle and a water-soluble organic solvent having a boiling point of from 100 to 180 degrees C. or ?-alkoxy propionamide of Chemical formula I, where R1 represents a methyl group, an ethyl group, a propyl group, or a butyl group and R2 and R3 each, independently represent alkyl groups having one to six carbon atoms, and the first ink and the second ink includes no organic solvent having a boiling point of 280 degrees C. or higher under 1 atm.
    Type: Application
    Filed: June 27, 2017
    Publication date: January 4, 2018
    Inventors: Juichi FURUKAWA, Masaaki Tsuda, Hidefumi Nagashima, Yukihiro Imanaga, Masahiro Kido, Hikaru Kobayashi, Yuta Nakamura
  • Patent number: 9856386
    Abstract: An inkjet ink set is provided. The inkjet ink set includes a first ink including a resin A and an organic solvent A; and a second ink including a resin B and an organic solvent which is the same as or different from the organic solvent A. The minimum film forming temperature (MFT) of the resin A is lower than that of the resin B.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: January 2, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Kido, Naohiro Toda, Tomohiro Nakagawa, Juichi Furukawa, Hidefumi Nagashima, Hikaru Kobayashi
  • Patent number: 9855763
    Abstract: An ink for inkjet includes water; two or more hydrosoluble organic solvents; a pigment; and a resin particle more than the pigment by weight. A hydrosoluble organic solvent A having the smallest SP value and a hydrosoluble organic solvent B having the largest SP among the two or more hydrosoluble organic solvents satisfy the following relations (1) and (2): SP value of hydrosoluble organic solvent B?SP value of hydrosoluble organic solvent A?3??(1) boiling point of hydrosoluble organic solvent B>boiling point of hydrosoluble organic solvent A??(2).
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: January 2, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Naohiro Toda, Tomohiro Nakagawa, Hidefumi Nagashima, Juichi Furukawa, Masahiro Kido, Hikaru Kobayashi
  • Publication number: 20170174919
    Abstract: An ink including: water; at least one organic solvent; a polysiloxane surfactant; and acryl-silicone resin particles, where the polysiloxane surfactant has an HLB value of 8 or less.
    Type: Application
    Filed: December 16, 2016
    Publication date: June 22, 2017
    Inventors: Masahiro KIDO, Juichi FURUKAWA, Hidefumi NAGASHIMA, Yuta NAKAMURA, Masaaki TSUDA, Hikaru KOBAYASHI, Yukihiro IMANAGA, Michihiko NAMBA, Hiroaki TAKAHASHI, Takahiro YOSHIDA
  • Patent number: 9663668
    Abstract: An inkjet ink, containing: water; a water-soluble organic solvent; a pigment; and polycarbonate urethane resin particles, wherein the water-soluble organic solvent contains 50% by mass or more of a diol compound, and wherein the water-soluble organic solvent contains 50% by mass or more of a water-soluble organic solvent having a boiling point of 200° C. or less.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: May 30, 2017
    Assignee: Rioch Company, Ltd.
    Inventors: Tomohiro Nakagawa, Naohiro Toda, Hidefumi Nagashima, Ichiroh Fujii, Juichi Furukawa
  • Publication number: 20170121545
    Abstract: An aqueous ink for inkjet includes water, at least one hydrosoluble organic solvent each having a boiling point of 250° C. or lower; vinyl polymer particles containing a pigment, and polycarbonate-based urethane resin particles, wherein the aqueous ink for inkjet is used for an inkjet recording system including a heating step.
    Type: Application
    Filed: January 16, 2017
    Publication date: May 4, 2017
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hidefumi NAGASHIMA, Naohiro Toda, Tomohiro Nakagawa, Juichi Furukawa, Ichiroh Fujii