Patents Examined by Herbert S. Cockeran
  • Secondary aromatic diamines as curing agents in polyurethane manufacturing
    Patent number: 4578446
    Abstract: Polyurethanes may be conveniently made by curing isocyanate-terminated urethane prepolymers with a N,N'-dialkylmethylenedianiline. The diamine N,N'-di(2-butyl)-4,4'-methylenedianiline is a particularly useful diamine. The resulting polyurethanes often are thermoplastic rather than thermosetting, making them especially useful as coatings, adhesives, and sealants. Such secondary aromatic diamines have acceptable pot lives and afford products with a variety of properties.
    Type: Grant
    Filed: March 25, 1985
    Date of Patent: March 25, 1986
    Assignee: UOP Inc.
    Inventors: David W. House, Ray V. Scott, Jr.