Patents Assigned to NuSil Research
  • Process for the preparation of alkyl and aryl substituted oligosiloxanes suitable for use as diffusion pump oils
    Patent number: 4309557
    Abstract: An improved process for preparing 1,3-dialkyl-1,1,3,3-tetraryldisiloxanes and 1,3,5-trialkyl-1,1,3,5,5-pentaaryltrisiloxanes is disclosed. The process utilizes an aryl Grignard reagent to affect displacement of alkoxy, preferably methoxy, groups in the corresponding alkyl-alkoxy substituted di-, and trisiloxanes. Alternatively, partial replacement of the alkoxy groups in an alkyltrialkoxysilane with aryl groups in a Grignard reaction, and subsequent hydrolyis of the remaining alkoxy groups yield the above-noted desired compounds.
    Type: Grant
    Filed: February 12, 1981
    Date of Patent: January 5, 1982
    Assignee: NuSil Research
    Inventors: Richard A. Compton, Del J. Petraitis