Patents by Inventor Teruyoshi Kiyota

Teruyoshi Kiyota 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).

  • Solid catalyst component for &agr;-olefin polymerization, catalyst for &agr;-olefin polymerization, and process for producing &agr;-olefin polymer
    Patent number: 6187883
    Abstract: The present invention relates to a solid catalyst component for &agr;-olefin polymerization having a narrow particle size distribution of not less than 6.0 in terms of the value of N in a Rosin-Rammler function of particle size distribution and giving a catalytic activity of not less than 10,000 ((g-polymer produced/g-solid catalyst component)/hour) in polymerization. The catalyst component is obtained by a process which comprises reducing a titanium compound with an organomagnesium compound in the presence of an organosilicon compound and an ester to obtain a solid product, then treating the solid product with: (a) a mixture of titanium tetrachloride and an ether, (b) an organic acid halide, and (c) a mixture of titanium tetrachloride and an ether optionally containing an ester.
    Type: Grant
    Filed: August 13, 1997
    Date of Patent: February 13, 2001
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Makoto Satoh, Teruyoshi Kiyota, Akio Imai