Patents Examined by Daniel S. Metzmaher
  • Demulsification of water-in-oil emulsions
    Patent number: 6638983
    Abstract: Water-in-Oil emulsions are demulsified using adducts of a) polyalkylene glycols (PAGS) having a molecular weight greater than 6,500 and up to 60,000, ethylene oxide (EO), and diisocyanates (DIs) or b) polyalkylene glycols (PAGs) having a molecular weight greater than 6,500 and up to 60,000 and diisocyanates (DIs). The preferred PAG is polypropylene glycol and the preferred DIs are meta or para tetramethylxylene diisocyanate and toluene diisocyanate.
    Type: Grant
    Filed: February 4, 1999
    Date of Patent: October 28, 2003
    Assignee: Ondeo Nalco Company
    Inventor: Grahame N. Taylor