Patents by Inventor Tukuo Makishima

Tukuo Makishima 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).

  • Titanium trichloride catalyst and process for the production thereof
    Patent number: 4321346
    Abstract: A titanium trichloride catalytic complex is produced by reducing titanium tetrachloride with an organo-metal compound and then treating the resulting reduced solids product with a chlorinated saturated hydrocarbon having two carbon atoms in the presence of a complexing agent. The resulting titanium trichloride complex composition, when employed as a co-catalyst with an organo-metal compound for Ziegler-type catalysts in polymerization of .alpha.-olefins, results in uniform polymer grains with unexpectedly high polymerization activity and high stereoregular polymer yielding ratios.
    Type: Grant
    Filed: July 20, 1979
    Date of Patent: March 23, 1982
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Hiroshi Ueno, Naomi Inaba, Tukuo Makishima, Koh Watanabe, Shozo Wada
  • Titanium trichloride catalyst and process for the production thereof
    Patent number: 4240928
    Abstract: A titanium trichloride catalytic complex is produced by reducing titanium tetrachloride with an alkylaluminum halide composition at low temperature and then treating the resulting reduced solids product by contacting it at elevated temperature with a dialkyl ether having alkyl groups of 4 to 5 carbon atoms and with hexachloroethane, the proportion of dialkyl ether being at least 1 mol per 1 mol of hexachloroethane and the proportion of hexachloroethane being at least greater than about 0.5 mol per 1 gram atom of titanium in the reduced solids product. The resulting titanium trichloride complex composition, when employed as co-catalyst with an organo-metal compound for Ziegler-type catalysts in polymerization of .alpha.-olefins, results in uniform polymer grains with unexpectedly high polymerization activity and high stereoregular polymer yielding ratios.
    Type: Grant
    Filed: July 25, 1978
    Date of Patent: December 23, 1980
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Hiroshi Ueno, Naomi Inaba, Tukuo Makishima, Koh Watanabe, Shozo Wada
  • Titanium trichloride catalyst and process for the production thereof
    Patent number: 4182691
    Abstract: A titanium trichloride catalytic complex is produced by reducing titanium tetrachloride with an organo-metal compound and then treating the resulting reduced solids product with a chlorinated saturated hydrocarbon having two carbon atoms in the presence of a complexing agent. The resulting titanium trichloride complex composition, when employed as a co-catalyst with an organo-metal compound for Ziegler-type catalysts in polymerization of .alpha.-olefins, results in uniform polymer grains with unexpectedly high polymerization activity and high stereoregular polymer yielding ratios.
    Type: Grant
    Filed: February 9, 1979
    Date of Patent: January 8, 1980
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Hiroshi Ueno, Naomi Inaba, Tukuo Makishima, Koh Watanabe, Shozo Wada