Patents Examined by K. Hellender
  • Method of hydrophobing silica
    Patent number: 5001183
    Abstract: A method of producing hydrophobic colloidal silica is disclosed. The method comprises combining an aqueous colloidal silica dispersion, polyorganosiloxane, and anionic surfactant to yield a stable aqueous emulsion of hydrophobic colloidal silica. The emulsion may be further processed by evaporating the water to yield a white material which may be easily ground to a fine powder of hydrophobic colloidal silica. This powder is useful as a reinforcement for silicone rubber.
    Type: Grant
    Filed: May 31, 1990
    Date of Patent: March 19, 1991
    Assignee: Dow Corning Corporation
    Inventors: Bruce W. Sands, John C. Saam