Patents by Inventor Tatuo Kinoshita

Tatuo Kinoshita 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).

  • Process for producing ethylene/alpha-olefin copolymer
    Patent number: 6153807
    Abstract: A copolymer of ethylene and an alpha-olefin having an ethylene content of from 30 to 90 mole %, a number average molecular weight of from 300 to 30,000 and a molecular weight distribution defined by a Q value (the ratio of the weight average molecular weight to the number average molecular weight of not more than 3 and a Z value (the ratio of the maximum value of the molecular weight to the minimum value of the molecular weight when the molecular weight is measured by gel permeation chromatography) of from 15 to 200. The said copolymer can be produced by a process comprising copolymerizing ethylene with an alpha-olefin in the liquid phase in the presence of a polymerization catalyst composed of a combination of a soluble vanadium compound and an organoaluminum compound in the co-presence of hydrogen, characterized in that(a) the copolymerization is carried out in a continuous manner,(b) the concentration of the vanadium compound in the polymerization system is maintained at 0.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: November 28, 2000
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hidekuni Oda, Tatuo Kinoshita, Akiyoshi Shimizu
  • Ethylene/alpha-olefin copolymer
    Patent number: 5955639
    Abstract: A copolymer of ethylene and an alpha-olefin having an ethylene content of from 30 to 90 mole %, a number average molecular weight of from 300 to 30,000 and a molecular weight distribution defined by a Q value (the ratio of the weight average molecular weight to the number average molecular weight) of not more than 3 and a Z value (the ratio of the maximum value of the molecular weight to the minimum value of the molecular weight when the molecular weight is measured by gel permeation chromatography) of from 15 to 200. The said copolymer can be produced by a process comprising copolymerizing ethylene with an alpha-olefin in the liquid phase in the presence of a polymerization catalyst composed of a combination of a soluble vanadium compound and an organoaluminum compound in the co-presence of hydrogen, characterized in that(a) the copolymerization is carried out in a continuous manner,(b) the concentration of the vanadium compound in the polymerization system is maintained at 0.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: September 21, 1999
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hidekuni Oda, Tatuo Kinoshita, Akiyoshi Shimizu
  • Ethylene/alpha-olefin copolymer
    Patent number: 5767331
    Abstract: A copolymer of ethylene and an alpha-olefin having an ethylene content of from 30 to 90 mole %, a number average molecular weight of from 300 to 30,000 and a molecular weight distribution defined by a Q value (the ratio of the weight average molecular weight to the number average molecular weight) of not more than 3 and a Z value (the ratio of the maximum value of the molecular weight to the minimum value of the molecular weight when the molecular weight is measured by gel permeation chromatography) of from 15 to 200. The said copolymer can be produced by a process comprising copolymerizing ethylene with an alpha-olefin in the liquid phase in the presence of a polymerization catalyst composed of a combination of a soluble vanadium compound and an organoaluminum compound in the co-presence of hydrogen, characterized in that(a) the copolymerization is carried out in a continuous manner,(b) the concentration of the vanadium compound in the polymerization system is maintained at 0.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: June 16, 1998
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Hidekuni Oda, Tatuo Kinoshita, Akiyoshi Shimizu