Patents by Inventor Katsuo Hagiwara

Katsuo Hagiwara 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).

  • Composition for dip forming, dip-formed object, and process for producing the same
    Patent number: 6878766
    Abstract: A dip-formed article which is shaped from a dip-formable composition comprising 100 weight parts of a conjugated diene copolymer prepared by copolymerization of 50 to 85 weight % of a conjugated diene monomer with 15 to 40 weight % of an ethylenically unsaturated nitrile monomer, 1 to 4 weight % of an ethylenically unsaturated acid monomer and 0 to 30 weight % of a copolymerizable other ethylenically unsaturated monomer, 2 to 6 weight parts of sulfur and 0 to 0.2 weight parts of zinc oxide. The dip-formed article is characterized as a glove by being well elongated and ease in donning, being not easily broken upon donning, and not wearying a wearer's hand even when it is worn for a long time, and having improved lastingness of the tight conformity to the skin of a wearer's hand.
    Type: Grant
    Filed: January 24, 2001
    Date of Patent: April 12, 2005
    Assignee: Zeon Corporation
    Inventors: Katsuo Hagiwara, Hisanori Ota, Jun Sotoyama, Toshihiro Sakakibara
  • Composition for dip forming, dip-formed object, and process for producing the same
    Publication number: 20030050377
    Abstract: A dip-formed article which is shaped from a dip-formable composition comprising 100 weight parts of a conjugated diene copolymer prepared by copolymerization of 50 to 85 weight % of a conjugated diene monomer with 15 to 40 weight % of an ethylenically unsaturated nitrile monomer, 1 to 4 weight % of an ethylenically unsaturated acid monomer and 0 to 30 weight % of a copolymerizable other ethylenically unsaturated monomer, 2 to 6 weight parts of sulfur and 0 to 0.2 weight parts of zinc oxide. The dip-formed article is characterized as a glove by being well elongated and ease in donning, being not easily broken upon donning, and not wearying a wearer's hand even when it is worn for a long time, and having improved lastingness of the tight conformity to the skin of a wearer's hand.
    Type: Application
    Filed: July 24, 2002
    Publication date: March 13, 2003
    Inventors: Katsuo Hagiwara, Hisanori Ota, Jun Sotoyama, Toshihiro Sakakibara
  • Copolymer latex
    Patent number: 5286783
    Abstract: A copolymer latex obtained by emulsion-polymerization of 45 to 85% by weight of a conjugated diene monomer, 0.1 to 25% by weight of an ethylenically unsaturated acid monomer, 10 to 45% by weight of a vinyl-pyridine monomer and 0 to 30% by weight of another monomer copolymerizable with these monomers. The surface of the latex particles contains the carboxy groups in an amount of at least 0.01 milliequivalent per gram of the copolymer. An adhesive composition comprising the copolymer latex is useful for boding fibers, particularly polyester fibers, to rubber with a high adhesion strength.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: February 15, 1994
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Hiroshi Hisaki, Katsuo Hagiwara, Yasuhiro Nakano, Satoru Takinami, Masayoshi Sekiya