Patents by Inventor Mitsuru Naruse

Mitsuru Naruse 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).

  • Publication number: 20150252203
    Abstract: An ink composition contains a pigment, a polymer having a structure unit having a diphosphonic acid group, a hydrosoluble solvent, and water, and satisfies the following A and B. A: The pigment is represented by the following chemical formula 1a or chemical formula 1b. As for Chemical formula 1a, the pigment satisfies the relation 1: Y/X?0.800, where X and Y represent peak intensities at a Bragg (2?±0.2°) angle in a CuK? X-ray diffraction spectrum, when the pigment is represented by Chemical formula 1b, the pigment satisfies the relation 2: Y?/X??0.200, where X? and Y? represent peak intensities at a Bragg (2?±0.2°) angle in a CuK? X-ray diffraction spectrum, B. the structure unit having a diphosphonic acid group is represented by Chemical formula 2.
    Type: Application
    Filed: February 18, 2015
    Publication date: September 10, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Akihiko Matsuyama, Shigeyuki Harada, Keita Katoh, Masayuki Fukuoka, Mitsuru Naruse, Kazukiyo Nagai, Yuusuke Koizuka, Masayasu Nonogaki
  • Publication number: 20150247049
    Abstract: Inkjet ink contains a pigment, a hydrosoluble solvent, and water, wherein the pigment is represented by the following chemical formula 1 and has a CuK? X-ray diffraction spectrum having a wavelength of 1.541 ? such that no main peak is observed at a Bragg (2?±0.2°) angle in a range of 2? of from 28.0° to 29.0°, wherein R represents a hydrogen atom, a methyl group, or a chlorine atom.
    Type: Application
    Filed: May 14, 2015
    Publication date: September 3, 2015
    Inventors: Akihiko MATSUYAMA, Mitsuru Naruse, Masayasu Nonogaki, Minoru Hakiri, Keita Katoh
  • Patent number: 9056995
    Abstract: An inkjet recording ink set, which contains at least: a black pigment ink; and a color pigment ink, wherein the black pigment ink contains a black pigment treated with an anionic surfactant, and a black pigment coated with a resinous polymer, and water, and the black pigment ink is a pigment dispersion liquid where the black pigment treated with the anionic surfactant and the black pigment coated with the resinous polymer are dispersed in the water, and wherein the color pigment ink contains a color pigment, a nonionic surfactant, and water, and the color pigment ink is a pigment dispersion liquid where the color pigment is dispersed in the water with assistance of the nonionic surfactant.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: June 16, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Shin Hasegawa, Minoru Hakiri, Hiroyuki Fushimi, Mitsuru Naruse, Naoya Morohoshi
  • Patent number: 9028056
    Abstract: An ink for inkjet recording includes water; a hydrosoluble organic solvent; a pigment; and a polymer including a first structural unit represented by the following formula (1): wherein R1 represents a hydrogen atom or a methyl group; and M+ represents at least one member selected from the group consisting of alkali metal ions, organic amine ions and hydrogen ions; and a second structural unit represented by the following formula (2) or (3): wherein each of R2 and R3 represents a methyl group or a hydrogen atom; n represents an integer of 18; x represents 0 or an integer of 2.
    Type: Grant
    Filed: October 3, 2014
    Date of Patent: May 12, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuru Naruse, Masayasu Nonogaki, Akihiko Matsuyama, Keita Katoh, Kazukiyo Nagai, Yuusuke Koizuka
  • Publication number: 20150125672
    Abstract: An ink for inkjet recording, which is used for recording on a paper having a concentration of an eluted Ca ion of from 1.0×10?4 to 5.0×10?4 g/g when dipped in pure water. The ink includes at least a pigment, a pigment dispersant, a water-soluble organic solvent and water. The pigment dispersant is a copolymer synthesized using at least (1) unsaturated ethylene monomer having a phosphoric acid group or a phosphonic acid group and (2) unsaturated ethylene monomer having an alkyl group having 12 to 22 carbon atoms.
    Type: Application
    Filed: January 13, 2015
    Publication date: May 7, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Keita Katoh, Mitsuru Naruse, Akihiko Matsuyama, Masayasu Nonogaki, Minoru Hakiri, Kazukiyo Nagai, Yuusuke Koizuka
  • Publication number: 20150109382
    Abstract: An ink for inkjet recording includes water; a hydrosoluble organic solvent; a pigment; and a polymer including a first structural unit represented by the following formula (1): wherein R1 represents a hydrogen atom or a methyl group; and M+ represents at least one member selected from the group consisting of alkali metal ions, organic amine ions and hydrogen ions; and a second structural unit represented by the following formula (2) or (3): wherein each of R2 and R3 represents a methyl group or a hydrogen atom; n represents an integer of 18; x represents 0 or an integer of 2.
    Type: Application
    Filed: October 3, 2014
    Publication date: April 23, 2015
    Inventors: Mitsuru Naruse, Masayasu Nonogaki, Akihiko Matsuyama, Keita Katoh, Kazukiyo Nagai, Yuusuke Koizuka
  • Patent number: 8979989
    Abstract: An ink for inkjet recording including a pigment, a penetrating agent and water, wherein the pigment includes: an ozone-oxidized carbon black, including carbon black oxidized by ozone and having a volatile matter content of the carbon black of 10% by mass to 20% by mass and a BET specific surface area of 90 m2/g to 150 m2/g; and a resin-coated carbon black, including: carbon black; and a resin present on a surface of the carbon black.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: March 17, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Minoru Hakiri, Mitsuru Naruse, Masayasu Nonogaki
  • Patent number: 8974895
    Abstract: An inkjet ink that contains at least water; a water-soluble organic solvent; a pigment; and a copolymer or a salt thereof. The copolymer or the salt thereof has at least a structural unit represented by Formula 1, a structural unit represented by Formula 2, and a structural unit represented by Formula 3 or 4.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: March 10, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuru Naruse, Masayasu Nonogaki, Keita Katoh, Akihiko Matsuyama, Kazukiyo Nagai, Yuusuke Koizuka
  • Publication number: 20150064418
    Abstract: An ink composition contains a pigment; a copolymer containing a phosphoric acid group or phosphonic acid group; a hydrosoluble solvent; and water, wherein the pigment is represented by the following chemical formula 1 and satisfies the following relation 1: Y<X<0.8, where X represents a peak intensity at a Bragg (2?±0.2°) angle in a range of 2? of from 5.5° to 6.0° and Y represents a peak intensity at a Bragg (2?±0.2°) angle in a range of 2? of from 26.5° to 27.5° to a CuK? X-ray having a wavelength of 1.541 ?. where R each, independently represents monovalent groups selected from hydrogen atoms, methyl groups, or chlorine atoms.
    Type: Application
    Filed: August 20, 2014
    Publication date: March 5, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Akihiko Matsuyama, Mitsuru Naruse, Masayasu Nonogaki, Keita Katoh, Kazukiyo Nagai, Yuusuke Koizuka
  • Publication number: 20150064425
    Abstract: An ink composition contains a pigment; a copolymer comprising a phosphoric acid group or phosphonic acid group; a hydrosoluble solvent; and water, wherein the pigment is represented by the following chemical formula 1 and satisfies the following relation 1: Y/X?0.20??Relation 1 where X represents a peak intensity at a Bragg (2?±0.2°) angle in a range of 2? of from 26.5° to 27.5° and Y represents a peak intensity at a Bragg (2?±0.2°) angle in a range of 2? of from 11.0° to 11.5° to a CuK? X-ray having a wavelength of 1.541 ?.
    Type: Application
    Filed: August 11, 2014
    Publication date: March 5, 2015
    Inventors: Akihiko MATSUYAMA, Mitsuru Naruse, Masayasu Nonogaki, Kazukiyo Nagai, Keita Katoh, Yuusuke Koizuka
  • Patent number: 8960885
    Abstract: An ink for inkjet recording, which is used for recording on a paper having a concentration of an eluted Ca ion of from 1.0×10?4 to 5.0×10?4 g/g when dipped in pure water. The ink includes at least a pigment, a pigment dispersant, a water-soluble organic solvent and water. The pigment dispersant is a copolymer synthesized using at least (1) unsaturated ethylene monomer having a phosphoric acid group or a phosphonic acid group and (2) unsaturated ethylene monomer having an alkyl group having 12 to 22 carbon atoms.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: February 24, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Keita Katoh, Mitsuru Naruse, Akihiko Matsuyama, Masayasu Nonogaki, Minoru Hakiri, Kazukiyo Nagai, Yuusuke Koizuka
  • Patent number: 8955953
    Abstract: An inkjet recording ink including a carbon black, a dispersant, a polyurethane resin particle, and water, where the carbon black is a channel black, a gas black, or a mixture of channel black and a gas black, and the polyurethane resin particle is an anionic self-emulsifying ether-based polyurethane resin particle, wherein the anionic self-emulsifying ether-based polyurethane resin particle has an acid value of 40 to 120 and a mass average molecular weight of 500 to 50,000, and an average primary particle diameter of 20 nm or less.
    Type: Grant
    Filed: January 22, 2009
    Date of Patent: February 17, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Minoru Hakiri, Mitsuru Naruse, Shin Hasegawa
  • Patent number: 8919945
    Abstract: An inkjet ink including water, a pigment, a polymer, and a hydrazine compound. The polymer does not include an anionic unit and includes a first unit having a carbonyl group capable of reacting with a hydrazino group, and a second unit having at least one of an amino group, a dimethylamino group, and a diethylamino group. The content of the first unit is from 40% to 90% by weight based on the weight of the polymer, and the inkjet ink has a pH of not less than 9.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: December 30, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuru Naruse, Minoru Hakiri, Naoya Morohoshi
  • Publication number: 20140267516
    Abstract: An inkjet recording ink, including: water; a water-soluble solvent; a pigment; and a phosphate group-containing copolymer, wherein the phosphate group-containing copolymer includes a structural unit represented by the following general formula (1) and a structural unit represented by the following general formula (2): wherein, in the general formula (1), R1 represents either of a hydrogen atom and a methyl group; and M+ represents any of an alkali metal ion, an organic amine ion and a hydrogen ion, one-half or more of the M+ in the copolymer is an alkali metal ion or an organic amine, and the remainder is a hydrogen ion; wherein, in the general formula (2), R2 represents either of a hydrogen atom and a methyl group.
    Type: Application
    Filed: March 10, 2014
    Publication date: September 18, 2014
    Applicant: Ricoh Company, Ltd.
    Inventors: Masayasu Nonogaki, Keita Katoh, Minoru Hakiri, Mitsuru Naruse, Akihiko Matsuyama, Kazukiyo Nagai, Yuusuke Koizuka, Nobuyuki Sakamoto, Yosuke Matsuoka, Masatomo Takahashi
  • Patent number: 8827434
    Abstract: Ink for ink jet recording containing a coloring agent, water, an aqueous organic solvent, and a polyacrylic acid ester-based polymer represented by the following chemical structure 1: where R represents a hydrogen atom and a methyl group, X— represents F—, Cl—, and Br—, M+ represents Na+, K+, NH4+, and Li+, and symbols l, m, n, and p independently represent integers of from 10 to 3,000.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: September 9, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Minoru Hakiri, Mitsuru Naruse, Naoya Morohoshi
  • Publication number: 20140242352
    Abstract: An inkjet ink that contains at least water; a water-soluble organic solvent; a pigment; and a copolymer or a salt thereof. The copolymer or the salt thereof has at least a structural unit represented by Formula 1, a structural unit represented by Formula 2, and a structural unit represented by Formula 3 or 4. In Formula 1, R1 represents a methyl group or a hydrogen atom, M+s each represent a hydrogen ion, an alkali metal ion, or an organic ammonium ion, and m and n each, independently represent 0 or an integer of from 1 to 6 excluding a case of both m and n being 0 at the same time. In Formula 2, R2 represents a methyl group or a hydrogen atom. In Formula 3, R3 represents a methyl group or a hydrogen atom.
    Type: Application
    Filed: February 19, 2014
    Publication date: August 28, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Mitsuru Naruse, Masayasu Nonogaki, Keita Katoh, Akihiko Matsuyama, Kazukiyo Nagai, Yuusuke Koizuka
  • Patent number: 8815002
    Abstract: An inkjet recording ink including: water; a first pigment dispersion; a second pigment dispersion; and a penetrating agent, wherein the first pigment dispersion includes oxidized carbon black CB-1 dispersed therein with a pH of the first pigment dispersion adjusted to 6 to 8 with an alkali metal hydroxide, where the oxidized carbon black CB-1 is oxidized with ozone and has a volatile content of 10% to 20% and a BET specific surface area of 90 m2/g to 150 m2/g, and the second pigment dispersion includes carbon black CB-2 dispersed therein with a naphthalene sulfonic acid-formalin condensate, where the carbon black CB-2 has an average particle diameter (D50) of 50 nm to 180 nm as measured by a dynamic light scattering method and a standard deviation of particle diameters of the carbon black CB-2 is equal to or lower than ½ of the average particle diameter.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: August 26, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Minoru Hakiri, Mitsuru Naruse, Masayasu Nonogaki, Naoya Morohoshi
  • Patent number: 8770735
    Abstract: An inkjet recording ink including a pigment dispersion liquid containing at least a first carbon black and a dispersant, a second carbon black, a penetrant, a wetting agent and water, wherein the first carbon black has an average particle diameter D50 of 70 nm to 180 nm as measured by a dynamic light scattering method and has a particle diameter standard deviation equal to or smaller than ½ of the average particle diameter, wherein the dispersant is a condensate of naphthalene sulfonic acid and formalin, wherein the second carbon black is carbon black coated with a resin, and wherein the penetrant is a 2-ethyl-1,3-hexandiol.
    Type: Grant
    Filed: September 6, 2010
    Date of Patent: July 8, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Minoru Hakiri, Shin Hasegawa, Hiroyuki Fushimi, Mitsuru Naruse, Naoya Morohoshi
  • Patent number: 8740371
    Abstract: An inkjet recording ink set containing at least a black pigment ink and a color pigment ink which has a color selected from one or more colors, wherein the black pigment ink contains a first anionic self-emulsifying ether polyurethane resin having an acid value of 65 mgKOH/g to 85 mgKOH/g, and the at least one color pigment ink of every color contains a second anionic self-emulsifying ether polyurethane resin having an acid value 10 mgKOH/g to 40 mgKOH/g lower than those of the first anionic self-emulsifying ether polyurethane resin contained in the black pigment ink.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: June 3, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Shin Hasegawa, Minoru Hakiri, Mitsuru Naruse
  • Publication number: 20140141209
    Abstract: An ink for inkjet recording includes water; a water-soluble solvent; a pigment; and a copolymer including a salt of phosphonic acid group.
    Type: Application
    Filed: October 10, 2013
    Publication date: May 22, 2014
    Inventors: Yuusuke KOIZUKA, Kazukiyo Nagai, Mitsuru Naruse, Masayasu Nonogaki, Minoru Hakiri, Akihiko Matsuyama, Keita Katoh