Patents by Inventor Syozo Kawamata

Syozo Kawamata 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 granular thermoplastic elastomer and granular elastomer
    Patent number: 5051484
    Abstract: A solid catalyst component for .alpha.-olefin polymerization containing as catalyst components at least titanium, magnesium and chlorine which are impregnated into an organic porous polymer carrier having a mean particle diameter of 5 to 1,000 .mu.m and a pore volume of 0.1 ml/g or above at a pore radius of 100 to 5,000 .ANG., a catalyst system comprising at least said solid catalyst component (A) and an organoaluminum compound (B), as well as a process for producing .alpha.-olefin polymers using said catalyst system.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: September 24, 1991
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Toshio Sasaki, Takeshi Ebara, Hiroyuki Kora, Kiyoshi Kawai, Mituharu Yamasaki, Syozo Kawamata
  • Process for producing olefin polymers and catalyst used therein
    Patent number: 4900706
    Abstract: A solid catalyst component for .alpha.-olefin polymerization containing as catalyst components at least titanium, magnesium and chlorine which are impregnated into an organic porous polymer carrier having a mean particle diameter of 5 to 1,000 .mu.m and a pore volume of 0.1 ml/g or above at a pore radius of 100 to 5,000 .ANG., a catalyst system comprising at least said solid catalyst component (A) and an organoaluminum compound (B), as well as a process for producing .alpha.-olefin polymers using said catalyst system.
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: February 13, 1990
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Toshio Sasaki, Takeshi Ebara, Hiroyuki Kora, Kiyoshi Kawai, Mituharu Yamasaki, Syozo Kawamata
  • Alpha-olefin block copolymer particles and process for the production thereof
    Patent number: 4820775
    Abstract: A process for the production of .alpha.-olefin block copolymer particles having excellent impact resistance at low temperature and excellent molding and processing characteristics, is disclosed. The process includes a two step gas phase polymerization procedure under specific conditions in the presence of a specific catalyst system.
    Type: Grant
    Filed: May 23, 1986
    Date of Patent: April 11, 1989
    Assignee: Sumitomo Chemical Company Limited
    Inventors: Akinobu Shiga, Masahiro Kakugo, Hajime Sadatoshi, Hiroyuki Kora, Toshio Sasaki, Junpei Kojima, Kazuki Wakamatsu, Syozo Kawamata