Patents by Inventor Seiichi Zemba

Seiichi Zemba 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).

  • Copolymerized polyester compositions
    Patent number: 5089553
    Abstract: The present invention relates to a novel copolymerized composition characterized in that it comprises (A) 100 parts by weight of a copolymerized polyester containing (a) an aromatic dicarboxylic acid unit composed mainly of a terephthalic acid unit, (b) a glycol unit composed mainly of an ethylene glycol unit, (c) a polytetramethylene glycol unit, (d) a polyethylene glycol unit and (e) an aliphatic dicarboxylic acid unit having 9 or more carbon atoms, (B) 5 to 150 parts by weight of a reinforcing substance and (C) 1 to 10 parts by weight of a metal salt of an ionic copolymer.The copolymerized polyester compositions of the present invention retain excellent heat resistance and rigidity that the glass fiber-reinforced polyethylene terephthalate compositions possess originally and are considerably improved in terms of low-temperature moldability, toughness, alkali resistance and like other factors.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: February 18, 1992
    Assignees: Idemitsu Petrochemical Co., Ltd., Kuraray Company Limited
    Inventors: Takashi Umeda, Seiichi Zemba, Kazuo Hara, Katsunori Takamoto, Shinichi Yokota