Patents by Inventor Masami Kashimoto

Masami Kashimoto 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).

  • Patent number: 9963522
    Abstract: The present invention provides a metallocene complex capable of producing a homopolypropylene having a high melting point in the homopolymerization of propylene, and a production method of an olefin polymer using the same. The metallocene complex of the present invention is represented by formula [I].
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: May 8, 2018
    Assignee: JAPAN POLYPROPYLENE CORPORATION
    Inventors: Toshinori Suzuki, Masami Kashimoto, Masato Nakano, Hideshi Uchino, Takao Tayano
  • Patent number: 9902749
    Abstract: Provided are a metallocene complex that facilitates copolymerization of olefin monomers including propylene at a higher uptake rate of comonomers, i.e., ethylene and ?-olefin, manufacture of a rubber component having a higher molecular weight, and manufacture of homopolypropylene having a higher melting point through homopolymerization of propylene, compared to traditional metallocene catalysts, and a method of olefin polymerization in the presence of such a metallocene complex. Also provided are, for example, a metallocene complex represented by general formula [I] (e.g., a metallocene complex having a substituent at position 6 of one or each indenyl ring and an optionally substituted furyl or thienyl group at position 2 of one or each indenyl ring), an olefin polymerization catalyst containing the metallocene complex, and a method of olefin polymerization involving olefin polymerization or copolymerization in the presence of the olefin polymerization catalyst.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: February 27, 2018
    Assignee: JAPAN POLYPROPYLENE CORPORATION
    Inventors: Masami Kashimoto, Takayoshi Takahashi, Naoshi Iwama, Masato Nakano, Toshinori Suzuki
  • Publication number: 20170081431
    Abstract: The present invention provides a metallocene complex capable of producing a homopolypropylene having a high melting point in the homopolymerization of propylene, and a production method of an olefin polymer using the same. The metallocene complex of the present invention is represented by formula [I].
    Type: Application
    Filed: March 17, 2015
    Publication date: March 23, 2017
    Applicant: JAPAN POLYPROPYLENE CORPORATION
    Inventors: Toshinori SUZUKI, Masami KASHIMOTO, Masato NAKANO, Hideshi UCHINO, Takao TAYANO
  • Publication number: 20150266914
    Abstract: Provided are a metallocene complex that facilitates copolymerization of olefin monomers including propylene at a higher uptake rate of comonomers, i.e., ethylene and ?-olefin, manufacture of a rubber component having a higher molecular weight, and manufacture of homopolypropylene having a higher melting point through homopolymerization of propylene, compared to traditional metallocene catalysts, and a method of olefin polymerization in the presence of such a metallocene complex. Also provided are, for example, a metallocene complex represented by general formula [I] (e.g., a metallocene complex having a substituent at position 6 of one or each indenyl ring and an optionally substituted furyl or thienyl group at position 2 of one or each indenyl ring), an olefin polymerization catalyst containing the metallocene complex, and a method of olefin polymerization involving olefin polymerization or copolymerization in the presence of the olefin polymerization catalyst.
    Type: Application
    Filed: October 28, 2013
    Publication date: September 24, 2015
    Applicant: JAPAN POLYPROPYLENE CORPORATION
    Inventors: Masami Kashimoto, Takayoshi Takahashi, Naoshi Iwama, Masato Nakano, Toshinori Suzuki
  • Patent number: 8461365
    Abstract: A metallocene complex by which high uptake efficiency of ethylene and/or ?-olefin can be obtained compared with the conventional metallocene catalyst, and robber component having high molecular weight can be polymerized, and polymerization method of olefin. Metallocene complex (metallocene complex having furyl or thienyl group in which substituent exists at 5-position of indenyl ring, and substituent may exist at 2-position of indenyl ring, and the like) represented by the general formula [II], the catalyst for olefin polymerization characterized by comprising said metallocene complex, and polymerization method of olefin characterized that polymerization or copolymerization of olefin is carried out using said polymerization catalyst for olefin, and the like.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: June 11, 2013
    Assignee: Japan Polypropylene Corporation
    Inventors: Masato Nakano, Hideshi Uchino, Naoshi Iwama, Masami Kashimoto, Tomohiro Kato
  • Publication number: 20110230622
    Abstract: A metallocene complex by which high uptake efficiency of ethylene and/or ?-olefin can be obtained compared with the conventional metallocene catalyst, and rubber component having high molecular weight can be polymerized, and polymerization method of olefin. Metallocene complex (metallocene complex having furyl or thienyl group in which substituent exists at 5-position of indenyl ring, and substituent may exist at 2-position of indenyl ring, and the like) represented by the general formula [I], the catalyst for olefin polymerization characterized by comprising said metallocene complex, and polymerization method of olefin characterized in that polymerization or copolymerization of olefin is carried out using said polymerization catalyst for olefin, and the like.
    Type: Application
    Filed: December 14, 2009
    Publication date: September 22, 2011
    Applicant: JAPAN POLYPROPYLENE CORPORATION
    Inventors: Masato Nakano, Hideshi Uchino, Naoshi Iwama, Masami Kashimoto, Tomohiro Kato
  • Patent number: 7906599
    Abstract: Disclosed is a novel transition metal compound which is used for forming a metallocene catalyst for olefin polymerization. Specifically disclosed is a novel transition metal compound represented by the general formula below which enables to form a metallocene catalyst that has a balanced reactivity with ethylene and a comonomer selected from ?-olefins having 3-20 carbon atoms and enables to produce an ?-olefin polymer having a high molecular weight. Also specifically disclosed are a catalyst for olefin polymerization containing such a transition metal compound, and a method for producing a propylene/ethylene-?-olefin block copolymer wherein such a catalyst is used.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: March 15, 2011
    Assignee: Japan Polypropylene Corporation
    Inventors: Hisashi Ohtaki, Naoshi Iwama, Masami Kashimoto, Tomohiro Kato, Tsutomu Ushioda
  • Publication number: 20090099310
    Abstract: Disclosed is a novel transition metal compound which is used for forming a metallocene catalyst for olefin polymerization. Specifically disclosed is a novel transition metal compound represented by the general formula below which enables to form a metallocene catalyst that has a balanced reactivity with ethylene and a comonomer selected from ?-olefins having 3-20 carbon atoms and enables to produce an ?-olefin polymer having a high molecular weight. Also specifically disclosed are a catalyst for olefin polymerization containing such a transition metal compound, and a method for producing a propylene/ethylene-?-olefin block copolymer wherein such a catalyst is used.
    Type: Application
    Filed: April 17, 2007
    Publication date: April 16, 2009
    Applicant: JAPAN POLYPROPYLENE CORPORATION
    Inventors: Hisashi Ohtaki, Naoshi Iwama, Masami Kashimoto, Tomohiro Kato, Tsutomu Ushioda
  • Patent number: 6825371
    Abstract: The present invention relates to a catalyst for polymerization of &agr;-olefin, which comprises: an essential component (A) of a transition metal compound, an essential component (B) of an ion exchangeable layer compound except for silicate, or an inorganic silicate, and an optional component (C) of an organoaluminum compound, said component (A) being represented by the general formula (I):
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: November 30, 2004
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Toshihiko Sugano, Masami Kashimoto, Taku Kato
  • Publication number: 20030166459
    Abstract: The present invention relates to a catalyst for polymerization of &agr;-olefin, which comprises:
    Type: Application
    Filed: December 3, 2002
    Publication date: September 4, 2003
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Toshihiko Sugano, Masami Kashimoto, Taku Kato
  • Patent number: 6344530
    Abstract: The present invention relates to a catalyst for polymerization of &agr;-olefin, which comprises: an essential component (A) of a transition metal compound, an essential component (B) of an ion exchangeable layer compound except for silicate, or an inorganic silicate, and an optional component (C) of an organoaluminum compound, said component (A) being represented by the general formula (I):
    Type: Grant
    Filed: April 17, 2001
    Date of Patent: February 5, 2002
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Toshihiko Sugano, Naoshi Iwama, Satoshi Hayakawa, Hisashi Shoda, Masami Kashimoto, Taku Kato, Takayuki Aoshima
  • Patent number: 6340652
    Abstract: Catalysts for polymerization of &agr;-olefin, composed of a transition metal compound, an inorganic silicate or an ion exchangeable layer compound other than silicate, and optionally an organoaluminum compound, are described.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: January 22, 2002
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Toshihiko Sugano, Naoshi Iwama, Eiji Isobe, Toru Suzuki, Yasuo Maruyama, Satoshi Hayakawa, Hisashi Shoda, Masami Kashimoto, Taku Kato, Takayuki Aoshima, Sugio Nishimura, Yoshinori Suga, Stefan Sieber
  • Publication number: 20010034425
    Abstract: The present invention relates to a catalyst for polymerization of &agr;-olefin, which comprises:
    Type: Application
    Filed: April 17, 2001
    Publication date: October 25, 2001
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Toshihiko Sugano, Naoshi Iwama, Eiji Isobe, Toru Suzuki, Yasuo Maruyama, Satoshi Hayakawa, Hisashi Shoda, Masami Kashimoto, Taku Kato, Takayuki Aoshima, Sugio Nishimura, Yoshinori Suga, Stefan Sieber
  • Patent number: 6252097
    Abstract: The present invention relates to a catalyst for polymerization of &agr;-olefin, which comprises: an essential component (A) of a transition metal compound, an essential component (B) of an ion exchangeable layer compound except for silicate, or an inorganic silicate, and an optional component (C) of an organoaluminum compound, said component (A) being represented by the general formula (I):
    Type: Grant
    Filed: May 20, 1999
    Date of Patent: June 26, 2001
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Toshihiko Sugano, Naoshi Iwama, Eiji Isobe, Toru Suzuki, Yasuo Maruyama, Satoshi Hayakawa, Hisashi Shoda, Masami Kashimoto, Taku Kato, Takayuki Aoshima, Sugio Nishimura, Yoshinori Suga, Stefan Sieber