Patents by Inventor Yasuo Wakatuki

Yasuo Wakatuki 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).

  • Catalyst composition and process for producing copolymer
    Patent number: 6960631
    Abstract: A method for block copolymerization of a conjugated diene and an aromatic vinyl compound, which comprises the steps of carrying out homopolymerization of the conjugated diene in the presence of a catalyst composition comprising the following components: (A) a metallocene type complex of a rare earth metal compound, and (B) an ionic compound composed of a non-coordinate anion and a cation and/or an aluminoxane, and then adding the aromatic vinyl compound, and a catalyst composition for polymerization of a conjugated diene or copolymerization of a conjugated diene and an aromatic vinyl compound, which comprises the following components: (D) a neodymium complex, and (B) an ionic compound composed of a non-coordinate anion and a cation and/or an aluminoxane.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: November 1, 2005
    Assignee: Riken
    Inventors: Shojiro Kaita, Zhaomin Hou, Yasuo Wakatuki
  • Catalyst composition and process for producing copolymer
    Publication number: 20030166458
    Abstract: A method for block copolymerization of a conjugated diene and an aromatic vinyl compound, which comprises the steps of carrying out homopolymerization of the conjugated diene in the presence of a catalyst composition comprising the following components: (A) a metallocene type complex of a rare earth metal compound, and (B) an ionic compound composed of a non-coordinate anion and a cation and/or an aluminoxane, and then adding the aromatic vinyl compound, and a catalyst composition for polymerization of a conjugated diene or copolymerization of a conjugated diene and an aromatic vinyl compound, which comprises the following components: (D) a neodymium complex, and (B) an ionic compound composed of a non-coordinate anion and a cation and/or an aluminoxane.
    Type: Application
    Filed: March 28, 2003
    Publication date: September 4, 2003
    Inventors: Shojiro Kaita, Zhaomin Hou, Yasuo Wakatuki