Patents by Inventor Kenji Mitsutani

Kenji Mitsutani 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).

  • Reactor for propylene polymerization and process for producing propylene polymer
    Patent number: 8735513
    Abstract: A propylene polymerization reaction apparatus and a production method of a propylene-based polymer are capable of producing a continuous multi-stage polymer in low cost, high productivity and stably, and significantly reducing generation amount of an off-specification product accompanying change of polymerization condition, in multi-stage continuous vapor phase polymerization method of a propylene-based polymer using a catalyst for olefin polymerization. A reaction apparatus for producing a propylene-based polymer by a multi-stage continuous vapor phase polymerization method is used. One or more reactor of a horizontal-type reactor having inside a stirring machine which rotates around a horizontal axis, and a continuous stirred tank reactor to be connected to the horizontal-type reactor are provided, and a production method of a propylene-based polymer using the same.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: May 27, 2014
    Assignee: Japan Polypropylene Corporation
    Inventors: Takanori Nakashima, Katsuhiko Oono, Kenji Mitsutani, Takao Tayano, Tomoyuki Yoshida, Shigeo Mizukami, Yusuke Yamada
  • Reactor for propylene polymerization and process for producing propylene polymer
    Patent number: 8546497
    Abstract: A propylene polymerization reaction apparatus and a production method of a propylene-based polymer are capable of producing a continuous multi-stage polymer in low cost, high productivity and stably, and significantly reducing generation amount of an off-specification product accompanying change of polymerization condition, in multi-stage continuous vapor phase polymerization method of a propylene-based polymer using a catalyst for olefin polymerization. A reaction apparatus for producing a propylene-based polymer by a multi-stage continuous vapor phase polymerization method is used. One or more reactor of a horizontal-type reactor having inside a stirring machine which rotates around a horizontal axis, and a continuous stirred tank reactor to be connected to the horizontal-type reactor are provided, and a production method of a propylene-based polymer using the same.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: October 1, 2013
    Assignee: Japan Polypropylene Corporation
    Inventors: Takanori Nakashima, Katsuhiko Oono, Kenji Mitsutani, Takao Tayano, Tomoyuki Yoshida, Shigeo Mizukami, Yusuke Yamada
  • REACTOR FOR PROPYLENE POLYMERIZATION AND PROCESS FOR PRODUCING PROPYLENE POLYMER
    Publication number: 20120264893
    Abstract: A propylene polymerization reaction apparatus and a production method of a propylene-based polymer are capable of producing a continuous multi-stage polymer in low cost, high productivity and stably, and significantly reducing generation amount of an off-specification product accompanying change of polymerization condition, in multi-stage continuous vapor phase polymerization method of a propylene-based polymer using a catalyst for olefin polymerization. A reaction apparatus for producing a propylene-based polymer by a multi-stage continuous vapor phase polymerization method is used. One or more reactor of a horizontal-type reactor having inside a stirring machine which rotates around a horizontal axis, and a continuous stirred tank reactor to be connected to the horizontal-type reactor are provided, and a production method of a propylene-based polymer using the same.
    Type: Application
    Filed: November 5, 2010
    Publication date: October 18, 2012
    Applicant: JAPAN POLYPROPYLENE CORPORATION
    Inventors: Takanori Nakashima, Katsuhiko Oono, Kenji Mitsutani, Takao Tayano, Tomoyuki Yoshida, Shigeo Mizukami, Yusuke Yamada
  • Method of estimating gel content of propylene block copolymer
    Patent number: 6466875
    Abstract: A concentration distribution of a rubber component in block copolymer particles is computed based on the operating conditions of a polymerization apparatus, a growth model equation of polymer particles on a solid catalyst component, and a residence time distribution of the particles in each of a homopolymerization stage and a copolymerization stage, and the gel content of the block copolymer is estimated based on the computation. The gel content of a propylene block copolymer can thereby be estimated precisely.
    Type: Grant
    Filed: December 28, 1999
    Date of Patent: October 15, 2002
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Kenji Mitsutani, Glen H. Ko, Kiyoshi Yukawa, Fuminao Watanabe
  • Propylene block copolymer
    Patent number: 6191232
    Abstract: The present invention provides a propylene block copolymer comprising polymer particles whose rubber-like component contents are 50% by weight or more, in an amount less than 1.0% by weight of the whole polymer particles finally discharged from a polymerization system.
    Type: Grant
    Filed: October 2, 1998
    Date of Patent: February 20, 2001
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Kenji Mitsutani, Kiyoshi Yukawa, Fumihiko Shimizu, Glen H. Ko, Eiji Tanaka, Fuminao Watanabe