Patents by Inventor Takayuki Tsubaki

Takayuki Tsubaki 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: 6753069
    Abstract: A resin composition for an ink jet recording sheet, an ink jet recording sheet, a method for ink jet recording, and a method for producing an ink jet recording sheet are provided, wherein an ink absorption ability and a blurring suppressive effect are satisfactorily achieved. The ink jet recording sheet is prepared from a substrate layer and an ink-receiving layer that is overlaid said substrate layer. The ink-receiving layer contains (1) a major component of a water-absorbing polymer compound represented by the formula (I), and (2) a cationic polymer compound. A mixing ratio by weight of the water-absorbing polymer compound (1) and the cationic polymer compound (2) may be in the range between 50/50 and 99/1. A cationic or nonionic surface active agent (3) may be contained in the ink-receiving layer in an amount from 1% by weight to 10% by weight.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: June 22, 2004
    Assignees: Dai-Ichi Kogyo Seiyaku Co., Ltd., Mitsubishi Plastics, Inc.
    Inventors: Katsuaki Matsuo, Takayuki Tsubaki
  • Patent number: 5859141
    Abstract: The present invention provides a cation-modified linear copolymer which comprises, within the molecule thereof, 95 to 85 mole % of an ethylene structural unit, 0.1 to 10 mole % of an ester structural unit represented by general formula (II), 0.1 to 6 mole % of an acrylic or methacrylic acid structural unit and 1 to 12 mole % of an amide structural unit represented by general formula (IV). The copolymer and has a weight-average molecular weight of 1,000 to 100,000. When incorporated in thermoplastic resins, it shows good compatibility and results in good mechanical properties.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: January 12, 1999
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Takayuki Tsubaki, Hideyuki Sumi, Hiroshi Hotta
  • Patent number: 5717048
    Abstract: The present invention provides a cation-modified linear copolymer which comprises, within the molecule thereof, 95 to 85 mole % of an ethylene structural unit, 0.1 to 10 mole % of an ester structural unit represented by general formula (II), 0.1 to 6 mole % of an acrylic or methacrylic acid structural unit and 1 to 12 mole % of an amide structural unit represented by general formula (IV). The copolymer has a weight-average molecular weight of 1,000 to 100,000. When incorporated in thermoplastic resins, it shows good compatibility and results in good mechanical properties.
    Type: Grant
    Filed: December 1, 1995
    Date of Patent: February 10, 1998
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Takayuki Tsubaki, Hideyuki Sumi, Hiroshi Hotta
  • Patent number: 5654369
    Abstract: The invention provides a thermoplastic resin composition uniformly and permanently rendered antistatic which comprises (A) 100 parts by weight of a thermoplastic resin, (B) 3-30 parts by weight of a cationic copolymer comprising 80-98 mol % of an ethylene unit and 2-20 mol % of a cationic unit and having a weight-average molecular weight of 1,000-50,000, and (C) 0.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: August 5, 1997
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Takayuki Tsubaki, Yutaka Nakayama, Hideyuki Sumi, Hiroshi Hotta