Patents Examined by Ellen McAvay
  • Polyamide-imide powders, compositions containing the same and method of making the powders
    Patent number: 4737304
    Abstract: The process for the manufacture of infusible and insoluble polyamide-imide powders of spheroidal form comprising first reacting at least one lactam in solution with a polyamide generator in the presence of an anionic polymerization catalyst and then adding to the polymerization reaction a polyisocyanate in an amount sufficient to first activate said polymerization and then to react with the polyamide chains being formed and to bridge the same; the resultant product; and lubricants comprising a lubricating fluid and the resultant product.
    Type: Grant
    Filed: October 8, 1986
    Date of Patent: April 12, 1988
    Assignee: Atochem
    Inventors: Man Vo Dinh, Jean-Paul Merval