Patents by Inventor Shigeo Tsuyama

Shigeo Tsuyama 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: 5093442
    Abstract: A method for producing a homopolymer or copolymer of an .alpha.-olefin is disclosed, wherein a specific catalyst is used, said catalyst comprising a solid catalyst component obtained by contacting, in the presence of a chlorinated hydrocarbon solvent, a titanium compound and an aromatic carboxylic ester with a solid component obtained by reacting a hydrocarbon solvent-soluble organomagnesium compound having an alkoxy group with a specified chlorosilane compound having an Si--H bond; an organoaluminum compound; and an alkoxysilane compound. By the method of the present invention, an .alpha.-olefin homopolymer or copolymer exhibiting high bulk density and stereoregularity can be efficiently produced under even such polymerization reaction conditions, that the polymerization temperature is high and the polymerization time is long.
    Type: Grant
    Filed: October 3, 1989
    Date of Patent: March 3, 1992
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Harumi Watanabe, Shigeo Tsuyama
  • Patent number: 4376720
    Abstract: An olefin polymerization catalyst which shows an extremely high activity even at low temperatures and is suited for the production of blow molding polymers, said catalyst comprising a solid component constituted by a chromium compound supported by an inorganic oxide carrier, and an organomagnesium complex compound soluble in the inert hydrocarbons and represented by the general formula: M.sub..alpha. Mg.sub..beta. R.sub.p.sup.1 R.sub.q.sup.2 R.sub.r.sup.3 X.sub.s Y.sub.t (wherein .alpha.>0, .beta.>0, p.gtoreq.0, q.gtoreq.0, r.gtoreq.0, s>0, t.gtoreq.0, 0<(s+t)/(.alpha.+.beta.).ltoreq.1.5 and p+q+r+s+t=m.alpha.+2.beta.; M is an atom selected from the group consisting of aluminum, zinc, boron, beryllium and lithium; m is the valence of M; R.sup.1, R.sup.2 and R.sup.3 may be same or different and represent respectively a hydrocarbon radical having 1 to 20 carbon atoms; X is OSiR.sup.5 R.sup.6 R.sup.7 ; and Y is a radical selected from the group consisting of OR.sup.4, OSiR.sup.5 R.sup.6 R.sup.7, NR.
    Type: Grant
    Filed: December 1, 1980
    Date of Patent: March 15, 1983
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Shigeo Tsuyama
  • Patent number: 4342708
    Abstract: Novel hydrocarbon-soluble isopropyl group-containing diorganomagnesium compounds and hydrocarbon solutions thereof are disclosed. The compound of the present invention has a high weight percent of Mg per one mol thereof, and the hydrocarbon solution of the present invention has a very low viscosity as compared with the conventional solutions. The hydrocarbon solution of the present invention can be prepared according any of various processes. If the reaction is carried out in an ether medium, the ether is substituted with a hydrocarbon solvent by removing the ether from the reaction mixture by distillation in the presence of the hydrocarbon solvent.
    Type: Grant
    Filed: July 16, 1980
    Date of Patent: August 3, 1982
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Yoshihiko Katayama, Tadashi Ikegami, Shigeo Tsuyama
  • Patent number: 4264472
    Abstract: A catalyst for preparing an .alpha.-olefin polymer having a broad molecular weight distribution and excellent physical properties, which comprises a solid catalyst component (A) and an organometal compound (B), the solid catalyst component (A) being obtained by reduction with an organomagnesium solution of the thermal decomposition solid product of special titanium compounds.
    Type: Grant
    Filed: August 29, 1979
    Date of Patent: April 28, 1981
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Tadashi Ikegami, Hisaya Sakurai, Yoshihiko Katayama, Shigeo Tsuyama, Yukitoshi Iwashita
  • Patent number: 4159965
    Abstract: A catalyst useful for polymerizing olefins, capable of providing an extremely high catalyst efficiency, excellent grain size and high bulk density of polymer; production of polymer having various molecular weight distributions from a broader range to a narrower range and controlling of die swell of formed polymer, by using a mechanical grinding and contacting means. Said catalyst shows a high activity and higher stereoregularity in the polymerization of polypropylene when it is used together with an electron donor compound.Said catalyst comprises a solid catalyst component (A) and an organometallic compound (B), said catalyst component (A) is obtained by reacting a specified organomagnesium component (i) with a specified chlorosilane compound (ii) and reacting and/or grinding-contacting the solid obtained by the reaction of (i) and (ii) with a titanium and/or vanadium compound containing at least one halogen atom.The organomagnesium component is of the formulaM.sub..alpha. Mg.sub..beta. R.sub.p.sup.1 R.sub.q.
    Type: Grant
    Filed: September 26, 1977
    Date of Patent: July 3, 1979
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Hisaya Sakurai, Hideo Morita, Tadashi Ikegami, Shigeo Tsuyama