Patents by Inventor Kizuku Wakatsuki

Kizuku Wakatsuki 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 producing polyolefin
    Patent number: 4483939
    Abstract: A process for producing a polyolefin, which comprises polymerizing an olefin in the presence of a catalyst system comprising:(a) a solid catalyst component obtained by supporting a titanium compound and/or a vanadium compound on a solid product derived from the reaction of a phenol, an aromatic carboxylate ester, and a solid reaction product of an organomagnesium compound and an aryloxyaluminum compound represented by the general formula Al(OR.sup.1).sub.3, wherein R.sup.1 represents an aryl group having 6 to 20 carbon atoms; and(b) an organoaluminum compound.
    Type: Grant
    Filed: August 9, 1982
    Date of Patent: November 20, 1984
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kazuo Baba, Kizuku Wakatsuki, Toshimi Sato, Tadashi Hikasa
  • Catalyst system for polymerization of olefins and process for production of polyolefins using the catalyst system
    Patent number: 4350802
    Abstract: A catalyst system useful for the polymerization of olefins which comprises(A) at least one organometallic compound of a typical metal belonging to I, II and III group of Periodic table,(B) a reaction production of (i) a solid organomagnesium compound of the formula: MgR.sub.l X.sub.2-1..alpha.D wherein R is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom, D is a Lewis base, l is a number in the range of 0<l<2 and .alpha. is a number in the range of 0.ltoreq..alpha.<1.5, (ii) a phenol compound, (iii) a Lewis base, and (iv) a titanium compound and/or vanadium compound, and optionally(C) a Lewis base in an amount of up to 1 mole to 1 mole of the component (A),and a process for homo- or copolymerization of olefins by using the catalyst system. The catalyst system of the present invention shows excellent activities not only per the transition metal compound but also per the solid catalyst and can give polyolefins having a high stereo-regularity.
    Type: Grant
    Filed: March 28, 1980
    Date of Patent: September 21, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kazuo Baba, Kizuku Wakatsuki, Tadashi Hikasa
  • Process for polymerizing olefins
    Patent number: 4339560
    Abstract: A process for the polymerization of an olefin which comprises polymerizing an olefin in the presence of a catalyst system consisting essentially of(A) an organoaluminum compound represented by the formula: AlR.sub.m.sup.1 X.sub.3-m.sup.1 wherein R.sup.1 is a hydrocarbon group having 1 to 8 carbon atoms, X.sup.1 is a halogen atom or an alkoxy group having 1 to 8 atoms and m is a number in the range of 1 to 3,(B) a product prepared by the reaction of (i) a titanium compound selected from the group represented by the formula: Ti(OR.sup.2).sub.p X.sub.q.sup.2 wherein R.sup.2 is a hydrocarbon group having 1 to 8 carbon atoms, X.sup.2 is a halogen atom and p and q are each a number satisfying the following ranges: 0.ltoreq.p.ltoreq.4, 0.ltoreq.q.ltoreq.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: July 13, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kazuo Baba, Kizuku Wakatsuki, Tadashi Hikasa