Patents Assigned to Perchem Limited
  • Organoclay materials
    Patent number: 4752342
    Abstract: Organoclay materials formed by reacting smectite clays with a quaternary ammonium compound are improved by controlling the pH of the reaction mixture, typically to a value in the range 8 to 10, and preferably 9.0.+-.0.5, and by including in the reaction mixture a further substance, such as urea or sulphamic acid, having an unsubstituted or substituted amino or amido group.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: June 21, 1988
    Assignee: Perchem Limited
    Inventors: John P. Tatum, Robert C. Wright