Patents by Inventor Hideo Mineshima

Hideo Mineshima 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 continuous multi-stage polymerization of olefins
    Patent number: 4692501
    Abstract: In a process for producing an olefin polymer which comprises continuously polymerizing an olefin in the presence of a catalyst composed of a transition metal compound component and an organometallic compound component in at least two independent polymerization zones connected in series by a pipeline while feeding the olefin and the catalyst into an upstream zone of polymerization and withdrawing the resulting polymer from a downstream zone of polymerization; the improvement wherein(1) the polymerization in the upstream polymerization zone is carried out in a liquid medium under conditions for slurry polymerization,(2) the solid polymer-containing slurry discharged from the upstream polymerization zone is fed into a liquid medium exchanging zone through an upper feed opening (A) in its upper portion, said liquid medium exchanging zone being provided between the upstream polymerization zone and the downstream polymerization zone and connected to these zones by pipelines, and an additional supply of the liquid m
    Type: Grant
    Filed: July 31, 1985
    Date of Patent: September 8, 1987
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Hideo Mineshima, Haruyuki Koda, Ryoichi Yamamoto
  • Process for producing chemically blended propylene resin composition
    Patent number: 4316966
    Abstract: In a process for producing a chemically blended propylene resin composition having an ethylene content of about 1 to about 40 mole % based on the entire monomer units of the resin composition which comprises (i) a pre-polymerization step, and (ii) a multiplicity of subsequent polymerization steps, the improvement wherein (I) the pre-polymerization step (i) is either (I-A) a step wherein about 1 to about 1500 g, per millimole of titanium atom, of ethylene is polymerized, (I-B) a step wherein about 1 to about 1500 g, per millimole of titanium atom, of propylene is polymerized, or (I-C) a step wherein about 1 to about 1000 g, per millimole of titanium atom, of an alpha-olefin having 4 to 10 carbon atoms is polymerized, and (II) said multiplicity of polymerization steps (ii) are the following steps (II-1), (II-2) and (II-3) which are carried out in separate reaction zones different from the reaction zone of the pre-polymerization step (i) in this order or in the order of (II-1), (II-3) and (II-2), (II-1) a step o
    Type: Grant
    Filed: October 16, 1980
    Date of Patent: February 23, 1982
    Assignee: Mitsui Petrochemical Industries Ltd.
    Inventors: Hideo Mineshima, Nobuo Sato, Susumu Masaki