Patents Assigned to Joseph Crosfield and Sons Limited
  • Process for the preparation of precipitated silicas having morphology similar to pyrogenic silicas
    Patent number: 4127641
    Abstract: A multistage precipitation and flocculation production process is disclosed in which primary silica particles are prepared and flocculated useing an alkali metal salt solution and further silica precipitated in the presence of the salt, the pH of the mixture reduced and the silica isolated, purified carefully dried and optionally milled.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: November 28, 1978
    Assignee: Joseph Crosfield and Sons Limited
    Inventors: Derek Aldcroft, Donald Barby, Anthony L. Lovell, James P. Quinn