Patents Assigned to Idemitsu Petrochemichal Co., Ltd.
  • Process for producing styrene-based polymers
    Patent number: 5254647
    Abstract: Disclosed is a process for producing a styrene-based polymer having syndiotactic configuration, which comprises continuously polymerizing styrene or styrene-based derivatives in a self-cleaning type reactor, while providing a sufficient shearing force to maintain a polydispersive state at a temperature of not more than 120.degree. C.According to the present invention, a styrene-based polymer having syndiotactic configuration can be produced efficiently and continuously, without adhesion of the polymer to the reactor and agitation blades.
    Type: Grant
    Filed: May 24, 1991
    Date of Patent: October 19, 1993
    Assignee: Idemitsu Petrochemichal Co., Ltd.
    Inventors: Koji Yamamoto, Kazutoshi Ishikawa, Hideki Imabayashi, Takashi Izumi