Patents Represented by Attorney, Agent or Law Firm Gary C. Cohn
  • Process for preparing polyamines with ion exchange resin catalysts
    Patent number: 4554378
    Abstract: Polyamines are prepared from aromatic amines and aliphatic aldehydes or ketones using cationic or acid ion exchange resins as a catalyst in an essentially oxygen-free atmosphere with the aromatic amines being distilled and protected from the atmosphere.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: November 19, 1985
    Assignee: The Dow Chemical Company
    Inventors: John L. Nafziger, Laura A. Rader, Irwin J. Seward, Jr.
  • Thermoplastic polyelectrolyte complexes
    Patent number: 4539373
    Abstract: Novel thermoplastic polyelectrolyte complexes are disclosed which are the reaction products of (a) a polyanion and (b) a polycation wherein one of the polyanion and polycation contains repeating units derived from a soft monomer. By the selection of said soft monomers and of the cation group present in the polycation, moldable, extrudable polyelectrolyte complexes are obtained.
    Type: Grant
    Filed: July 12, 1982
    Date of Patent: September 3, 1985
    Assignee: The Dow Chemical Company
    Inventors: Inder Mani, Glen L. Gunderman