Patents by Inventor Wataru Hirahata

Wataru Hirahata 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).

  • Transition metal compound, catalyst component for olefin polymerization, catalyst for olefin polymerization, and process for producing olefinic polymer
    Patent number: 6500909
    Abstract: A transition metal compound represented by the general formula (2) or (3) described below, a catalyst component for olefin polymerization comprising said transition metal compound, a catalyst component for olefin polymerization using said transition metal compound and (C) and/or (D) described below, and a process for producing an olefinic polymer wherein olefins are homopolymerized or olefins are copolymerized with other olefins and/or other polymerizable unsaturated compound using said catalyst for olefin polymerization. (C); A specific aluminum compound (D); A specific boron compound.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: December 31, 2002
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Wataru Hirahata, Makoto Itagaki, Kotohiro Nomura
  • Transition metal compound, catalyst component for olefin polymerization, catalyst for olefin polymerization, and process for producing olefinic polymer
    Publication number: 20010027162
    Abstract: A transition metal compound represented by the general formula (2) or (3) described below, a catalyst component for olefin polymerization comprising said transition metal compound, a catalyst component for olefin polymerization using said transition metal compound and (C) and/or (D) described below, and a process for producing an olefinic polymer wherein olefins are homopolymerized or olefins are copolymerized with other olefins and/or other polymerizable unsaturated compound using said catalyst for olefin polymerization.
    Type: Application
    Filed: May 18, 2001
    Publication date: October 4, 2001
    Inventors: Wataru Hirahata, Makoto Itagaki, Kotohiro Nomura
  • Catalyst for addition polymerization, and process for producing addition polymer with the same
    Publication number: 20010006931
    Abstract: A catalyst for addition polymerization obtained by contacting (A) an organoaluminum compound, (B) a specific boron compound and (C) a solid inorganic compound, and a process for producing an addition polymer characterized by polymerizing an addition-polymerizable monomer in the presence of the catalyst.
    Type: Application
    Filed: December 22, 2000
    Publication date: July 5, 2001
    Inventors: Wataru Hirahata, Yoshinori Seki
  • Transition metal compound, catalyst component for olefin polymerization, catalyst for olefin polymerization, and process for producing olefinic polymer
    Patent number: 6242377
    Abstract: A transition metal compound represented by the general formula (2) or (3) described below, a catalyst component for olefin polymerization comprising said transition metal compound, a catalyst component for olefin polymerization using said transition metal compound and (C) and/or (D) described below, and a process for producing an olefinic polymer wherein olefins are homopolymerized or olefins are copolymerized with other olefins and/or other polymerizable unsaturated compound using said catalyst for olefin polymerization. (C); A specific aluminum compound. (D); A specific boron compound.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: June 5, 2001
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Wataru Hirahata, Makoto Itagaki, Kotohiro Nomura