Silicone compositions having improved heat stability

摘要

Amines, ammonium compounds, amides and nitrogen-containing organosilicon compounds are used in elastomer-forming silicone materials containing 20-99 wt.% polyorganosiloxane with at least two alkenyl groups, 1-80 wt.% non-reinforcing filler and (as crosslinker) an organic peroxide or a combination of organo-hydrogen-silane and hydrosilylation catalyst. Silicone materials (I) which can be crosslinked to elastomers contain (wt.%): (A) polyorganosiloxane with a viscosity of 0.1-500000 Pa.s (at 25 degrees C) containing at least two alkenyl groups per molecule (20-99); (B) non-reinforcing filler with an average particle size (d50) of 0.1-200 micron and a specific surface of less than 100 m2/g (1-80); (C) crosslinkers selected from (C1) organic peroxides and (C2) a combination of an organosilicon compound with at least two Si-H functions and a hydrosilylation catalyst; and (D) a nitrogen compound selected from amino, ammonium or amido compounds and nitrogen-containing organosilicon compounds. An Independent claim is also included for silicone elastomers obtained by crosslinking (I).