Patents by Inventor Donald K. Booher

Donald K. Booher 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).

  • Hydrolysis-stable polycarbonate molding composition
    Patent number: 6107375
    Abstract: A thermoplastic composition featuring an improved resistance to hydrolysis is disclosed. The composition comprises (i) thermoplastic polycarbonate resin (ii) about 0.01 to 3 percent of a compound selected from the group consisting of phosphite and phosphonite and (iii) an additive amount of an oligomer or polymer the structure of which features at least one pendant cyclic iminoether group per molecular chain. The additive amount is that which is sufficient to improve the resistance of the polycarbonate resin to hydrolysis.
    Type: Grant
    Filed: October 8, 1998
    Date of Patent: August 22, 2000
    Assignee: Bayer Corporation
    Inventors: Sivaram Krishnan, James B. Johnson, Donald K. Booher
  • Release agents for polycarbonate molding compositions
    Patent number: 5001180
    Abstract: A monoester derived from guerbet alcohol and a monocarboxylic acid or a hydroxy carboxylic acid was found to be an effective mold release agent for a thermoplastic molding composition which comprise an aromatic polycarbonate resin. The alcohol of the invention is a guerbet alcohol having about 20 to 60 carbon atoms and the monoacid is characterized in that it has about 1 to 22 carbon atoms.
    Type: Grant
    Filed: November 1, 1989
    Date of Patent: March 19, 1991
    Assignee: Mobay Corporation
    Inventors: Charles E. Lundy, Sivaram Krishnan, Donald K. Booher