Patents by Inventor Tadahiro Ooishi

Tadahiro Ooishi 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: 8795858
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: August 5, 2014
    Assignee: FUJIFILM Corporation
    Inventors: Masahide Sato, Katsumi Araki, Kazufumi Omura, Tomohiro Ichikawa, Shinji Tsujimoto, Tadahiro Ooishi
  • Publication number: 20110229741
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.
    Type: Application
    Filed: March 18, 2011
    Publication date: September 22, 2011
    Applicant: FUJIFILM CORPORATION
    Inventors: Masahide SATO, Katsumi ARAKI, Kazufumi OMURA, Tomohiro ICHIKAWA, Shinji TSUJIMOTO, Tadahiro OOISHI
  • Publication number: 20100055505
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic power and a binder on a nonmagnetic support, wherein, the binder comprises a constituent component in the form of a polyurethane resin obtained from starting materials in the form of a polyisocyanate and a polyol denoted by general formula (I): wherein, in general formula (I), Z1 denotes an atom group forming a lactone ring with two adjacent carbon atoms.
    Type: Application
    Filed: August 27, 2009
    Publication date: March 4, 2010
    Applicant: FUJIFILM Corporation
    Inventors: Kazufumi Omura, Hirotaka Sato, Tadahiro Ooishi
  • Publication number: 20090098414
    Abstract: The present invention relates to a method of manufacturing a magnetic recording medium wherein the magnetic layer coating liquid comprising a ferromagnetic powder having an average particle size of 10 to 40 nm and a moisture content of 0.3 to 3.0 weight percent; a binder (a) comprising 0.2 to 0.7 meq/g of at least one polar group selected from the group consisting of —SO3M, —OSO3M, —PO(OM)2, —OPO(OM)2, and COOM (M denotes a hydrogen atom or the like) and having a weight average molecular weight of 20,000 to 200,000, and/or (b) comprising 0.5 to 5 meq/g of at least one polar group selected from the group consisting of —CONR1R2, —NR1R2, and —NR+R1R2R3 (wherein R1, R2, and R3 each independently denote a hydrogen atom or the like) and having a weight average molecular weight of 20,000 to 200,000; and a compound comprising at least one carboxyl group and/or hydroxyl group per molecule.
    Type: Application
    Filed: September 29, 2008
    Publication date: April 16, 2009
    Applicant: FUJIFILM Corporation
    Inventors: Tadahiro OOISHI, Kazufumi Omura, Hitoshi Noguchi, Hiroaki Takano
  • Publication number: 20090087684
    Abstract: An aspect of the present invention relates to a method of modifying a surface of a powder, comprising mixing a powder with a heterocyclic compound comprising at least one hydroxylic group and/or carboxylic group. The present invention further relates to a magnetic recording medium and a coating material.
    Type: Application
    Filed: September 29, 2008
    Publication date: April 2, 2009
    Applicant: FUJIFILM Corporation
    Inventors: Kazufumi OMURA, Tadahiro Ooishi, Takumi Tsuruoka
  • Publication number: 20090085002
    Abstract: An aspect of the present invention relates to a method of modifying a surface of a magnetic powder, comprising mixing a magnetic powder with a cyclic compound comprising at least one carboxylic group. A further aspect of the present invention relates to a magnetic coating material comprising a magnetic powder and a binder, further comprising a cyclic compound comprising at least one carboxylic group.
    Type: Application
    Filed: September 26, 2008
    Publication date: April 2, 2009
    Applicant: FUJIFILM Corporation
    Inventors: Kazufumi Omura, Tadahiro Ooishi