Patents by Inventor Hideyuki Takitani

Hideyuki Takitani 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).

  • Method for producing polyolefin
    Patent number: 6130301
    Abstract: A method for producing a polyolefin, which comprises polymerizing or copolymerizing at least one olefin in the presence of a catalyst system comprising (A) a solid catalyst component of a titanium catalyst component obtained by reacting at least one aluminum halide compound with a homogeneous solution containing magnesium, titanium and alkoxy groups, wherein the aluminum halide compound is added to the homogeneous solution to provide a halogen atom in a mol ratio of from 0.2 to 0.4 to one mol of the alkoxy groups contained in the homogeneous solution to precipitate particles in the former step, and the aluminum halide compound is further added to provide a halogen atom in a mol ratio of from 1 to 20 to one mol of the alkoxy groups to treat the resultant mixture containing the precipitated particles in the latter step, and (B) at least one organic aluminum compound catalyst component.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: October 10, 2000
    Assignee: Tosoh Corporation
    Inventors: Sadaki Nishimura, Hideyuki Takitani, Yutaka Naito, Mitsuhiro Mori
  • Manufacturing method of polyolefin
    Patent number: 5118769
    Abstract: A manufacturing method of polyolefin is disclosed wherein the catalyst used for the polymerization of .alpha.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: June 2, 1992
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Yozo Kondo, Mitsuhiro Mori, Yutaka Naito, Hideyuki Takitani, Toshikazu Chikusa