Patents by Inventor Kozaburo Nagata

Kozaburo Nagata 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).

  • Water-absorbent resin dispersion and polyurethane composition
    Patent number: 5994421
    Abstract: A water-absorbent resin dispersion comprising a water-absorbent resin (B) or a hydrous gel thereof dispersed in a liquid or heat-meltable organic active-hydrogen compound (A), wherein said resin (B) is formed by the polymerization of a water-soluble monomer or its precursor and a cross-linker and/or a polysaccharide in the compound (A); and a process for producing a polyurethane resin by the reaction of the dispersion with an organic polyisocyanate compound. As the polyurethane resin is excellent in the capacity and rate of absorption, it is useful as absorbent articles such as paper diaper and sanitary goods, humidity modifiers, cutoff material, and so forth.
    Type: Grant
    Filed: June 4, 1997
    Date of Patent: November 30, 1999
    Assignee: Sanyo Chemical Industries, Ltd.
    Inventors: Kazuya Otani, Masahiro Matsuoka, Kohei Maeda, Kozaburo Nagata, Takao Ando, Toru Nakanishi, Isao Ishikawa, Takayuki Tsuji
  • Process for manufacturing polyurethane foams
    Patent number: 5459172
    Abstract: The present invention is directed to flexible polyurethane foams useful as seat cushioning material for vehicles, aircraft, furniture and the like. The polyurethane foams are characterized by improved wet compression set properties, improved firmness, resilience and elongation. The foams are made by a process which comprises reacting a polyol having a hydroxyl equivalent of from 800-10,000, a glycerin derivative having oxyethylene groups thereon but characterized by having a significant number of unreacted secondary hydroxyl groups of glycerin, (c) water and (d) an organic polyisocyanate.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: October 17, 1995
    Assignee: Sanyo Chemical Industries, Ltd.
    Inventors: Motonao Kaku, Hidefumi Ohta, Futoshi Kitatani, Kozaburo Nagata
  • Polyisocyanurate resin and process for making the same
    Patent number: 4299924
    Abstract: High-density polyisocyanurate resins having improved rigidity, heat resistance and/or impact resistance can be obtained by reacting a polyisocyanate with a polymer polyol derived from a polyol having a molecular weight of at least 4500, and optionally a crosslinker, in the presence of trimerization catalyst, using isocyanate index of 200-5000.
    Type: Grant
    Filed: July 17, 1980
    Date of Patent: November 10, 1981
    Assignees: Toyota Jidosha Kogyo Kabushiki Kaisha, Sanyo Chemical Ind., Ltd.
    Inventors: Takao Nomura, Yoshio Taguchi, Kozaburo Nagata, Takuji Isaka
  • Flexible polyurethane foam
    Patent number: 4026829
    Abstract: A flexible polyurethane foam which produces a reduced amount of smoke when in contact with a flame and which has flame resistant properties is produced by reacting, under foaming conditions, a polyetherpolyol having a hydroxyl number of 25 - 80 and, a primary hydroxyl group content of at least 10% and a liquid mixture of a polyoxyethylenepolyol modified polyisocyanate and a polyisocyanate monomer.
    Type: Grant
    Filed: August 4, 1975
    Date of Patent: May 31, 1977
    Assignee: Sanyo Chemical Industries, Ltd.
    Inventors: Tetsuya Samura, Isao Ishikawa, Kozaburo Nagata