Patents by Inventor Kourei Kuroiwa

Kourei Kuroiwa 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).

  • Solid titanium catalyst component, olefin polymerization catalyst, and process for producing olefin polymer
    Patent number: 8629075
    Abstract: The present invention provides a process for producing an ?-olefin polymer comprising polymerizing or copolymerizing (a) C3 or higher ?-olefin(s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: January 14, 2014
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Tetsuhiro Matsumoto, Toshiyuki Tsutsui, Kisu Ro, Kourei Kuroiwa, Takushi Nagata, Atsushi Shibahara, Tatsuya Nakamura, Tetsunori Shinozaki
  • SOLID TITANIUM CATALYST COMPONENT, OLEFIN POLYMERIZATION CATALYST, AND PROCESS FOR PRODUCING OLEFIN POLYMER
    Publication number: 20100324239
    Abstract: The present invention provides a process for producing an ?-olefin polymer comprising polymerizing or copolymerizing (a) C3 or higher ?-olefin(s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.
    Type: Application
    Filed: August 6, 2010
    Publication date: December 23, 2010
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Tetsuhiro Matsumoto, Toshiyuki Tsutsui, Kisu Ro, Kourei Kuroiwa, Takushi Nagata, Atsushi Shibahara, Tatsuya Nakamura, Tetsunori Shinozaki
  • Solid Titanium Catalyst Component, Olefin Polymerization Catalyst, And Process For Producing Olefin Polymer
    Publication number: 20080004412
    Abstract: The present invention provides a process for producing an ?-olefin polymer comprising polymerizing or copolymerizing (a) C3 or higher ?-olefin(s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.
    Type: Application
    Filed: November 16, 2005
    Publication date: January 3, 2008
    Inventors: Tetsuhiro Matsumoto, Toshiyuki Tsutsui, Kisu Ro, Kourei Kuroiwa, Takushi Nagata, Atsushi Shibahara, Tatsuya Nakamura, Tooru Tanaka, Tetsunori Shinozaki