Patents Assigned to San Kaihatsu Kabushiki Kaisha
  • Method for recovering styrene monomer from polystyrene resin by using a catalyst
    Patent number: 6380448
    Abstract: The present invention relates to a method for recovering styrene monomers from polystyrene resins by using sulfate as a catalyst. The present invention makes possible to thermally decompose polystyrene resins at comparatively low temperatures, and to reduce facility costs, etc., and also makes possible to recover oil containing less ratio of low molecular weight components and a high content of styrene monomers from vapors obtained through thermal decomposition of polystyrene.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: April 30, 2002
    Assignee: San Kaihatsu Kabushiki Kaisha
    Inventors: Takumi Sato, Mitsuo Masunari