Method for preparing a thermal-stability additive and a thermally stable methyl-polysiloxane and compositions therefrom

Abstract From the Canadian patent

Endblocked methylpolysiloxane fluids such as, trimethylsiloxane-endblocked polydimethylsiloxanes are, made more resistant to thermally induced siloxane rearrangement by incorporating therein titanium-, zirconiumor hafnium-, containing compounds. Incorporation of these compounds may be accomplished either by mixing organosiloxy derivatives of Ti, Zr, or Hf with the fluid or by mixing certain organic derivatives of Ti, Zr, or Hf with the fluid and heating the mixture to decompose the added organic derivative. Further improvements in the thermal stability of the fluid may be obtained by mixing with the titaniumzirconium-, or hafnium-containing fluid a small amount of an organosilicon hydride …