Patents by Inventor Chiemi Okawa

Chiemi Okawa 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 preparing low molecular weight olefin (CO) polymer and polymerization catalyst used thereof
    Publication number: 20080171651
    Abstract: The present invention provides a process for preparing a low molecular weight olefin (co)polymer having a narrow molecular weight distribution with high productivity, by polymerizing or copolymerizing an olefin in the presence of an olefin polymerization catalyst comprising (A) a specific Group 4 transition metal compound, and (B) at least one compound selected from the group consisting of (B-1) an organometallic compound, (B-2) an organoaluminum compound, (B-3) an organoaluminum oxy-compound, and (B-4) a compound which reacts with the Group 4 transition metal compound (A) to form an ion pair; and compounds useful in that process.
    Type: Application
    Filed: May 24, 2007
    Publication date: July 17, 2008
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Yasushi Tohi, Naomi Urakawa, Koji Endo, Koji Kawai, Kazunori Okawa, Chiemi Okawa, Toshiyuki Tsutsui
  • Process for preparing low molecular weight olefin (CO)polymer and polymerization catalyst used therefor
    Patent number: 7241848
    Abstract: The present invention provides a process for preparing a low molecular weight olefin (co)polymer having a narrow molecular weight distribution with high productivity, by polymerizing or copolymerizing an olefin in the presence of an olefin polymerization catalyst comprising (A) a specific Group 4 transition metal compound, and (B) at least one compound selected from the group consisting of (B-1) an organometallic compound, (B-2) an organoaluminum compound, (B-3) an organoaluminum oxy-compound, and (B-4) a compound which reacts with the Group 4 transition metal compound (A) to form an ion pair; and compounds useful in that process.
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: July 10, 2007
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Yasushi Tohi, Naomi Urakawa, Koji Endo, Koji Kawai, Chiemi Okawa, legal representative, Toshiyuki Tsutsui, Kazunori Okawa, deceased
  • Process for preparing low molecular weight olefin (CO) polymer and polymerization catalyst used therefor
    Publication number: 20050131171
    Abstract: The present invention provides a process for preparing a low molecular weight olefin (co)polymer having a narrow molecular weight distribution with high productivity, by polymerizing or copolymerizing an olefin in the presence of an olefin polymerization catalyst comprising (A) a specific Group 4 transition metal compound, and (B) at least one compound selected from the group consisting of (B-1) an organometallic compound, (B-2) an organoaluminum compound, (B-3) an organoaluminum oxy-compound, and (B-4) a compound which reacts with the Group 4 transition metal compound (A) to form an ion pair; and compounds useful in that process.
    Type: Application
    Filed: October 30, 2003
    Publication date: June 16, 2005
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Yasushi Tohi, Naomi Urakawa, Koji Endo, Koji Kawai, Kazunori Okawa, Toshiyuki Tsutsui, Chiemi Okawa