Patents Examined by James R. ZHoffman
  • Process for hydrophobizing silicas and silicates with organosilanes
    Patent number: 4015031
    Abstract: Finely divided hydrophobic silica or silicate is produced by treating the dry, moving particles with an organic silane at elevated temperature. The silica or silicate which had been prepared by wet precipitation or pyrogenically and which is in powdered form is heated to a temperature of about 200.degree. to 300.degree. C. with agitation and is brought to a fluidized condition and then is treated dropwise with an organosilane which is stable and boils below 300.degree. C.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: March 29, 1977
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Helmut Reinhardt, Karl Trebinger, Gottfried Kallrath