Patents Assigned to Diamon Shamrock Chemical Co.
  • Monomer purification
    Patent number: 4751322
    Abstract: The monomer, trimethyl ammonium ethyl methacrylate methosulfate, is purified by passing same through a column of activated charcoal having a mean particle diameter of from about 0.5 mm to aboug 1.2 mm, the height to diameter ratio of the column being from about 3 to about 12 to 1. Monomer so treated can be polymerized to higher molecular weight polymers.
    Type: Grant
    Filed: April 25, 1986
    Date of Patent: June 14, 1988
    Assignee: Diamon Shamrock Chemical Co.
    Inventors: Stephen A. Fischer, Dinshaw F. Bardoliwalla, Reuben H. Grinstein, Gary L. Speenburgh