Patents Assigned to Kaneko Corporation
  • Process for preparing vinyl polymer
    Patent number: 6291612
    Abstract: A vinyl polymer having a controlled molecular weight and narrow molecular weight distribution is prepared by polymerizing a vinyl monomer using an organic halide polymerization initiator in the presence of a cuprous compound catalyst in a solvent containing an organic compound having a dielectric constant of at least 10 at 25° C., or by polymerizing a vinyl monomer using an organic halide polymerization initiator in the presence of a cuprous compound catalyst and also a specific 1,10-phenanthroline compound.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: September 18, 2001
    Assignee: Kaneko Corporation
    Inventors: Yasuhisa Kishimoto, Masato Kusakabe