Patents by Inventor Keiji Sasakura

Keiji Sasakura 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: 10781344
    Abstract: A tackifier resin is a reaction product of rosins (A), a ring structure-containing compound (B) capable of reacting with the rosins, and an alcohol (C).
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: September 22, 2020
    Assignee: HARIMA CHEMICALS, INCORPORATED
    Inventors: Masakazu Kono, Hiroki Abe, Tomoya Tanatsugu, Keiji Sasakura
  • Patent number: 10669439
    Abstract: A resin for an active energy ray curable ink contains a rosin-modified unsaturated polyester resin (A). The rosin-modified unsaturated polyester resin (A) is a reaction product of a material component containing rosins (a), ?,?-unsaturated carboxylic acids (b), and polyols (c); the mole ratio of an unsaturated bond based on the ?,?-unsaturated carboxylic acids (b) with respect to the total amount of the material component is 0.50 mol/kg or more and 2.00 mol/kg or less; the rosins (a) contain a stabilization-treated rosin at a ratio of 90 mass % or more with respect to the total amount of the rosins (a); the ?,?-unsaturated carboxylic acids (b) contain ?,?-unsaturated dicarboxylic acids; and the polyols (c) contain a trihydric or more alcohol.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: June 2, 2020
    Assignee: HARIMA CHEMICALS, INCORPORATED
    Inventors: Keijiro Okawachi, Keiji Sasakura, Tomoya Tanatsugu, Hiroyuki Hisada, Akihiro Morita
  • Publication number: 20190264044
    Abstract: A resin for an active energy ray curable ink contains a rosin-modified unsaturated polyester resin (A). The rosin-modified unsaturated polyester resin (A) is a reaction product of a material component containing rosins (a), ?,?-unsaturated carboxylic acids (b), and polyols (c); the mole ratio of an unsaturated bond based on the ?,?-unsaturated carboxylic acids (b) with respect to the total amount of the material component is 0.50 mol/kg or more and 2.00 mol/kg or less; the rosins (a) contain a stabilization-treated rosin at a ratio of 90 mass % or more with respect to the total amount of the rosins (a); the ?,?-unsaturated carboxylic acids (b) contain ?,?-unsaturated dicarboxylic acids; and the polyols (c) contain a trihydric or more alcohol.
    Type: Application
    Filed: July 13, 2017
    Publication date: August 29, 2019
    Applicant: Harima Chemicals, Incorporated
    Inventors: Keijiro Okawachi, Keiji Sasakura, Tomoya Tanatsugu, Hiroyuki Hisada, Akihiro Morita
  • Publication number: 20180371297
    Abstract: A tackifier resin is a reaction product of rosins (A), a ring structure-containing compound (B) capable of reacting with the rosins, and an alcohol (C).
    Type: Application
    Filed: October 17, 2016
    Publication date: December 27, 2018
    Applicant: Harima Chemicals, Incorporated
    Inventors: Masakazu Kono, Hiroki Abe, Tomoya Tanatsugu, Keiji Sasakura
  • Patent number: 9546234
    Abstract: A metal fine particle dispersant is obtained by reaction of a polymer (a) containing a first reactive functional group, an ionic group to be absorbed to metal fine particles, and a polyoxyalkylene side chain with a compound (b) containing a second reactive functional group to be bonded to the first reactive functional group and an active energy ray curable group to be cured by an active energy ray. A metal fine particle dispersion liquid containing the metal fine particle dispersant, metal fine particles, and a dispersion medium is prepared. The metal fine particle dispersion liquid is cured, thereby obtaining a cured film.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: January 17, 2017
    Assignee: HARIMA CHEMICALS, INCORPORATED
    Inventors: Yutaka Kitajima, Tetsuya Harada, Keiji Sasakura
  • Publication number: 20160002379
    Abstract: A metal fine particle dispersant is obtained by reaction of a polymer (a) containing a first reactive functional group, an ionic group to be absorbed to metal fine particles, and a polyoxyalkylene side chain with a compound (b) containing a second reactive functional group to be bonded to the first reactive functional group and an active energy ray curable group to be cured by an active energy ray. A metal fine particle dispersion liquid containing the metal fine particle dispersant, metal fine particles, and a dispersion medium is prepared. The metal fine particle dispersion liquid is cured, thereby obtaining a cured film.
    Type: Application
    Filed: January 16, 2014
    Publication date: January 7, 2016
    Applicant: HARIMA CHEMICALS, INCORPORATED
    Inventors: Yutaka KITAJIMA, Tetsuya HARADA, Keiji SASAKURA
  • Patent number: 6894096
    Abstract: A resin varnish for printing ink is produced by condensing phenol and formaldehyde in an ink solvent to obtain an ink solvent solution of resole initial condensate, after which the resole initial condensate and a rosin ester containing 30-60 wt % non-aromatic conjugate resin acid and 20-60 wt % aromatic resin acid are reacted at 100-250° C. in a system containing ink solvent or in a system containing ink solvent and drying oil. A high-viscosity, high-molecular-weight ink resin is produced efficiently by reacting, with resole initial condensate in ink solvent, a rosin ester containing specified contents by percentage of conjugate acid and aromatic resin acid. The resin varnish obtained has very few decomposition components and nonuniformly gelled components, so it also is suitable for screen printing ink and letterpress printing ink, in addition to offset printing ink.
    Type: Grant
    Filed: May 15, 2003
    Date of Patent: May 17, 2005
    Assignee: Harima Chemicals, Inc.
    Inventors: Keiji Sasakura, Hiroshi Toyoda
  • Publication number: 20030236331
    Abstract: A resin varnish for printing ink is produced by condensing phenol and formaldehyde in an ink solvent to obtain an ink solvent solution of resole initial condensate, after which the resole initial condensate and a rosin ester containing 30-60 wt % non-aromatic conjugate resin acid and 20-60 wt % aromatic resin acid are reacted at 100-250° C. in a system containing ink solvent or in a system containing ink solvent and drying oil. A high-viscosity, high-molecular-weight ink resin is produced efficiently by reacting, with resole initial condensate in ink solvent, a rosin ester containing specified contents by percentage of conjugate acid and aromatic resin acid. The resin varnish obtained has very few decomposition components and nonuniformly gelled components, so it also is suitable for screen printing ink and letterpress printing ink, in addition to offset printing ink.
    Type: Application
    Filed: May 15, 2003
    Publication date: December 25, 2003
    Applicant: Harima Chemicals, Inc.
    Inventors: Keiji Sasakura, Hiroshi Toyoda