Patents by Inventor Fumio Tutumi

Fumio Tutumi 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).

  • Olefin polymerization catalysts and olefin polymer production methods using said olefin polymerization catalysts
    Patent number: 6525150
    Abstract: Olefins are homopolymerized or copolymerized in the presence of a catalyst containing a reaction product obtained from vanadium oxytrichloride and 2,2′-thiobis(6-t-butyl-4-methylphenyl), an organic aluminum compound, such as trimethylaluminum, and an ionized ionic compound, such as N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, and the like. By using this catalyst to polymerize ethylene with an &agr;-olefin, such as propylene, 1-heptene, 1-octene, and the like, or a non-conjugated diene, such as 5-ethylidene-2-norbomene, and the like, a polymer having a high degree of copolymerization is obtained.
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: February 25, 2003
    Assignee: JSR Corporation
    Inventors: Toshiyuki Hayakawa, Fumio Tutumi