Patents by Inventor Yuuji Matsudaira

Yuuji Matsudaira 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).

  • Polybutadiene, modified polybutadiene, method for producing both, and rubber-reinforced styrene resin composition using same
    Patent number: 8669339
    Abstract: Disclosed are a polybutadiene having a controlled microstructure, a narrow molecular weight distribution, minimal gel content, and a low APHA color, a modified polybutadiene, producing methods for both, and a rubber-reinforced styrene resin composition using the same. The polybutadiene of the present invention is characterized in that the ratio (Tcp/ML1+4) of a 5% toluene melting viscosity (Tcp) measured at 25° C. and the Mooney viscosity (ML1+4) at 100° C. is 2.0 or higher, the molecular weight distribution (Mw/Mn) is 2.80 or less, the gel content is 0.06 wt % or less, and the APHA color is 20 or less.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: March 11, 2014
    Assignee: Ube Industries, Ltd.
    Inventors: Yasuyoshi Okabe, Yuuji Matsudaira, Chaiyaket Vichuta, Toshiyuki Sakaguchi
  • Polybutadiene, Modified Polybutadiene, Method for Producing Both, and Rubber-Reinforced Styrene Resin Composition Using Same
    Publication number: 20120309902
    Abstract: Disclosed are a polybutadiene having a controlled microstructure, a narrow molecular weight distribution, minimal gel content, and a low APHA color, a modified polybutadiene, producing methods for both, and a rubber-reinforced styrene resin composition using the same. The polybutadiene of the present invention is characterised in that the ratio (Tcp/ML1+4) of a 5% toluene melting viscosity (Tcp) measured at 25° C. and the Mooney viscosity (ML1+4) at 100° C. is 2.0 or higher, the molecular weight distribution (Mw/Mn) is 2.80 or less, the gel content is 0.06 wt % or less, and the APHA color is 20 or less.
    Type: Application
    Filed: February 21, 2011
    Publication date: December 6, 2012
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Yasuyoshi Okabe, Yuuji Matsudaira, Chaiyaket Vichuta, Toshiyuki Sakaguchi