Patents Examined by Karen A. Hennender
  • Spirobiindane copolysiloxanecarbonates and method for their preparation
    Patent number: 4895919
    Abstract: Copolysiloxanecarbonate compositions are prepared by the reaction of a carbonate precursor such as phosgene with a mixture of bisphenols including a spirobiindane bisphenol, at least one of said bisphenols containing polydiorganosiloxane moieties. The reaction may take place in one step or sequentially. The products are characterized by low processing temperature, low orientational birefringence and high ductility.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: January 23, 1990
    Assignee: General Electric Company
    Inventors: Gary R. Faler, David M. Dardaris, Donald G. LeGrand