Patents Assigned to Teijn Chemicals Ltd
  • Optical molding material
    Patent number: 6245405
    Abstract: An optical molding material which is an aromatic polycarbonate resin pellet, wherein the amount of fine powders, produced from 5 kg of the pellets mixed in a vessel for 1 hour and having a particle diameter of 1.0 mm or less, is 300 ppm or less. The formation of carbide during molding can be suppressed by using the pellets of the present invention.
    Type: Grant
    Filed: March 31, 1999
    Date of Patent: June 12, 2001
    Assignee: Teijn Chemicals Ltd
    Inventor: Shinzi Kawano