Patents by Inventor Shinichiro Shimura

Shinichiro Shimura 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: 11193033
    Abstract: An oil-based inkjet ink can be provided that prevents adhesion of the ink to the nozzle plate, thereby preventing ink misfires and discharge defects from the inkjet nozzles. The oil-based inkjet ink contains a pigment, a non-aqueous solvent, and a compound represented by general formula (1) shown below. (In general formula (1), m represents 1 or 2, each of R1 and R2 independently represents a monovalent saturated hydrocarbon group, R3 represents a single bond or a divalent saturated hydrocarbon group, and R4 represents a monovalent or divalent saturated hydrocarbon group.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: December 7, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Shinichiro Shimura, Toshihiro Endo, Kazuyuki Ando
  • Patent number: 10894897
    Abstract: An oil-based inkjet ink can be provided which prevents dye conversion of a dye lake pigment contained in the ink, prevents adhesion of the ink to the nozzle plate, and yields excellent drying properties for printed items. The oil-based inkjet ink contains a dye lake pigment, a pigment dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a surface tension of at least 20 mN/m but not more than 28 mN/m. The surface tension of the silicone oil is preferably at least 22 mN/m but not more than 26 mN/m.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: January 19, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Marie Morinaga, Shinichiro Shimura, Kazuyuki Ando, Hikaru Sugiura
  • Patent number: 10889730
    Abstract: An oil-based inkjet ink set is disclosed that includes: an oil-based inkjet ink A containing a non-aqueous solvent, the non-aqueous solvent of the oil-based inkjet ink A containing at least 15% by mass of a silicone oil relative to the total mass of the non-aqueous solvent of the oil-based inkjet ink A, and an oil-based inkjet ink B containing a non-aqueous solvent, the non-aqueous solvent of the oil-based inkjet ink B containing at least 50% by mass of a petroleum-based hydrocarbon solvent relative to the total mass of the non-aqueous solvent of the oil-based inkjet ink B. A method for producing a printed item is also disclosed.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: January 12, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Marie Morinaga, Toshihiro Endo, Shinichiro Shimura, Kazuyuki Ando, Hikaru Sugiura, Shinsuke Ozawa
  • Patent number: 10865321
    Abstract: An oil-based inkjet ink is disclosed, the oil-based inkjet ink containing a pigment, a pigment dispersant and a non-aqueous solvent, wherein the pigment contains an acidic carbon black having a pH of 2 to 6, the non-aqueous solvent contains a modified silicone oil having a surface tension of not more than 27 mN/m, and an amount of the modified silicone oil, relative to a total mass of the oil-based inkjet ink, is at least 15% by mass but not more than 80% by mass.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: December 15, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Kazuyuki Ando, Shinichiro Shimura, Marie Morinaga, Hikaru Sugiura
  • Patent number: 10865320
    Abstract: An oil-based inkjet ink is disclosed, the oil-based inkjet ink containing a colorant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a boiling point higher than 250° C. and a fatty acid ester-based solvent having 10 to 30 carbon atoms.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: December 15, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Shinichiro Shimura, Hikaru Sugiura, Shinsuke Ozawa
  • Patent number: 10865322
    Abstract: An oil-based inkjet ink can be provided which exhibits excellent discharge stability even after a long idle period, and also yields high image density and prevents show-through in printed items. The oil-based inkjet ink contains a pigment, an amide-based dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a modified silicone oil having 2 or 3 silicon atoms in one molecule, and a petroleum-based hydrocarbon solvent.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: December 15, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Hikaru Sugiura, Shinichiro Shimura, Marie Morinaga, Kazuyuki Ando
  • Patent number: 10808137
    Abstract: A method for producing a printed item including discharging two or more inks by an inkjet method toward a recording medium to form an image is disclosed, wherein the two or more inks include a first oil-based inkjet ink containing a first colorant and a non-aqueous solvent and having an ink surface tension of less than 27.0 mN/m, and a second oil-based inkjet ink containing a second colorant and a non-aqueous solvent and having an ink surface tension of 27.0 mN/m or greater, and the method includes discharging the first oil-based inkjet ink toward the recording medium at a discharge volume of at least 20 pl per one liquid droplet to form dots with the first oil-based inkjet ink, and subsequently discharging the second oil-based inkjet ink toward the recording medium at a discharge volume of less than 20 pl per one liquid droplet so as to overlap with the dots formed with the first oil-based inkjet ink.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: October 20, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Kazuyuki Ando, Shinichiro Shimura, Marie Morinaga, Hikaru Sugiura, Shinsuke Ozawa
  • Patent number: 10793734
    Abstract: Disclosed is an oil-based inkjet ink containing a colorant and a non-aqueous solvent, wherein the non-aqueous solvent contains at least 15% by mass but not more than 100% by mass, relative to the total mass of the non-aqueous solvent, of an organosilicon compound having 2 to 6 silicon atoms in one molecule, having an organic group in which a carbon atom is bonded directly to a silicon atom and in which the total number of carbon atoms and oxygen atoms is at least 4, and having a total number of carbon atoms and oxygen atoms, contained within all of the organic groups in which the total number of carbon atoms and oxygen atoms is at least 4, that is from 4 to 20 within one molecule.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: October 6, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Hikaru Sugiura, Shinsuke Ozawa, Shinichiro Shimura, Kazuyuki Ando, Marie Morinaga, Teruaki Okawa, Noriaki Sugawara
  • Publication number: 20200239719
    Abstract: An oil-based inkjet ink is disclosed that contains a pigment, a dispersant formed with an acidic resin, a low-molecular weight amine compound and a basic polymer, and a non-aqueous solvent. A method for producing an oil-based inkjet ink and a method for producing a dispersant is also disclosed.
    Type: Application
    Filed: December 17, 2019
    Publication date: July 30, 2020
    Inventors: Naofumi EZAKI, Shinichiro SHIMURA, Shinsuke OZAWA, Tsukasa HAMADA, Mitsuko KITANOHARA, Tetsuya SHIRAISHI
  • Patent number: 10717887
    Abstract: An oil-based inkjet is disclosed, the oil-based inkjet ink containing a pigment, a pigment dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a surface tension of at least 19.0 mN/m but less than 24.0 mN/m and a polar solvent having a surface tension of at least 27.0 mN/m, and a surface tension of the ink is at least 23.0 mN/m but less than 27.0 mN/m.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: July 21, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Hikaru Sugiura, Shinichiro Shimura, Marie Morinaga, Kazuyuki Ando
  • Patent number: 10569546
    Abstract: An inkjet printer includes: an oil-based ink containing silicone oil; and inkjet heads each including a nozzle row in which nozzles configured to eject the oil-based ink to a print medium conveyed in a conveyance direction are arranged, the inkjet heads being arranged adjacent to each other with the nozzles in each nozzle row arranged in a direction non-orthogonally intersecting the conveyance direction.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: February 25, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Shinsuke Ozawa, Shinichiro Shimura, Marie Morinaga, Kazuyuki Ando, Hikaru Sugiura
  • Publication number: 20200017702
    Abstract: Provided is an oil-based inkjet ink containing a pigment and a fatty acid ester-based solvent represented by general formula (1) shown below and having at least 18 but not more than 29 carbon atoms per molecule. In general formula (1), R1 represents an alkyl group of 5 or more carbon atoms, R2 represents an alkyl group of 6 or more carbon atoms, and at least one of R1 and R2 is a branched alkyl group of 9 or more carbon atoms having a side chain of 4 or more carbon atoms.
    Type: Application
    Filed: March 26, 2018
    Publication date: January 16, 2020
    Inventors: Kazuyuki ANDO, Shinichiro SHIMURA, Marie MORINAGA, Hikaru SUGIURA, Shinsuke OZAWA, Noriaki SUGAWARA
  • Publication number: 20190100668
    Abstract: A method for producing a printed item including discharging two or more inks by an inkjet method toward a recording medium to form an image is disclosed, wherein the two or more inks include a first oil-based inkjet ink containing a first colorant and a non-aqueous solvent and having an ink surface tension of less than 27.0 mN/m, and a second oil-based inkjet ink containing a second colorant and a non-aqueous solvent and having an ink surface tension of 27.0 mN/m or greater, and the method includes discharging the first oil-based inkjet ink toward the recording medium at a discharge volume of at least 20 pl per one liquid droplet to form dots with the first oil-based inkjet ink, and subsequently discharging the second oil-based inkjet ink toward the recording medium at a discharge volume of less than 20 pl per one liquid droplet so as to overlap with the dots formed with the first oil-based inkjet ink.
    Type: Application
    Filed: September 25, 2018
    Publication date: April 4, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Kazuyuki ANDO, Shinichiro SHIMURA, Marie MORINAGA, Hikaru SUGIURA, Shinsuke OZAWA
  • Publication number: 20190100002
    Abstract: An inkjet printer includes: an oil-based ink containing silicone oil; and inkjet heads each including a nozzle row in which nozzles configured to eject the oil-based ink to a print medium conveyed in a conveyance direction are arranged, the inkjet heads being arranged adjacent to each other with the nozzles in each nozzle row arranged in a direction non-orthogonally intersecting the conveyance direction.
    Type: Application
    Filed: August 8, 2018
    Publication date: April 4, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Shinsuke OZAWA, Shinichiro SHIMURA, Marie MORINAGA, Kazuyuki ANDO, Hikaru SUGIURA
  • Publication number: 20190100671
    Abstract: An oil-based inkjet ink set is disclosed that includes: an oil-based inkjet ink A containing a non-aqueous solvent, the non-aqueous solvent of the oil-based inkjet ink A containing at least 15% by mass of a silicone oil relative to the total mass of the non-aqueous solvent of the oil-based inkjet ink A, and an oil-based inkjet ink B containing a non-aqueous solvent, the non-aqueous solvent of the oil-based inkjet ink B containing at least 50% by mass of a petroleum-based hydrocarbon solvent relative to the total mass of the non-aqueous solvent of the oil-based inkjet ink B. A method for producing a printed item is also disclosed.
    Type: Application
    Filed: September 25, 2018
    Publication date: April 4, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Marie MORINAGA, Toshihiro ENDO, Shinichiro SHIMURA, Kazuyuki ANDO, Hikaru SUGIURA, Shinsuke OZAWA
  • Publication number: 20180340088
    Abstract: An oil-based inkjet ink can be provided that prevents adhesion of the ink to the nozzle plate, thereby preventing ink misfires and discharge defects from the inkjet nozzles. The oil-based inkjet ink contains a pigment, a non-aqueous solvent, and a compound represented by general formula (1) shown below. (In general formula (1), m represents 1 or 2, each of R1 and R2 independently represents a monovalent saturated hydrocarbon group, R3 represents a single bond or a divalent saturated hydrocarbon group, and R4 represents a monovalent or divalent saturated hydrocarbon group.
    Type: Application
    Filed: April 27, 2018
    Publication date: November 29, 2018
    Inventors: Shinichiro SHIMURA, Toshihiro ENDO, Kazuyuki ANDO
  • Publication number: 20180244939
    Abstract: An oil-based inkjet is disclosed, the oil-based inkjet ink containing a pigment, a pigment dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a surface tension of at least 19.0 mN/m but less than 24.0 mN/m and a polar solvent having a surface tension of at least 27.0 mN/m, and a surface tension of the ink is at least 23.0 mN/m but less than 27.0 mN/m.
    Type: Application
    Filed: February 26, 2018
    Publication date: August 30, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Hikaru Sugiura, Shinichiro Shimura, Marie Morinaga, Kazuyuki Ando
  • Publication number: 20180244937
    Abstract: Disclosed is an oil-based inkjet ink containing a colorant and a non-aqueous solvent, wherein the non-aqueous solvent contains at least 15% by mass but not more than 100% by mass, relative to the total mass of the non-aqueous solvent, of an organosilicon compound having 2 to 6 silicon atoms in one molecule, having an organic group in which a carbon atom is bonded directly to a silicon atom and in which the total number of carbon atoms and oxygen atoms is at least 4, and having a total number of carbon atoms and oxygen atoms, contained within all of the organic groups in which the total number of carbon atoms and oxygen atoms is at least 4, that is from 4 to 20 within one molecule.
    Type: Application
    Filed: February 26, 2018
    Publication date: August 30, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Hikaru SUGIURA, Shinsuke OZAWA, Shinichiro SHIMURA, Kazuyuki ANDO, Marie MORINAGA, Teruaki OKAWA, Noriaki SUGAWARA
  • Publication number: 20180244940
    Abstract: An oil-based inkjet ink is disclosed, the oil-based inkjet ink containing a pigment, a pigment dispersant and a non-aqueous solvent, wherein the pigment contains an acidic carbon black having a pH of 2 to 6, the non-aqueous solvent contains a modified silicone oil having a surface tension of not more than 27 mN/m, and an amount of the modified silicone oil, relative to a total mass of the oil-based inkjet ink, is at least 15% by mass but not more than 80% by mass.
    Type: Application
    Filed: February 26, 2018
    Publication date: August 30, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Kazuyuki ANDO, Shinichiro SHIMURA, Marie MORINAGA, Hikaru SUGIURA
  • Publication number: 20180244938
    Abstract: An oil-based inkjet ink can be provided which prevents dye conversion of a dye lake pigment contained in the ink, prevents adhesion of the ink to the nozzle plate, and yields excellent drying properties for printed items. The oil-based inkjet ink contains a dye lake pigment, a pigment dispersant and a non-aqueous solvent, wherein the non-aqueous solvent contains a silicone oil having a surface tension of at least 20 mN/m but not more than 28 mN/m. The surface tension of the silicone oil is preferably at least 22 mN/m but not more than 26 mN/m.
    Type: Application
    Filed: February 26, 2018
    Publication date: August 30, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Marie MORINAGA, Shinichiro SHIMURA, Kazuyuki ANDO, Hikaru SUGIURA