Polysiloxane compositions.

摘要

The specification describes and claims a composition capable of cure when exposed to moisture of the atmosphere at ambient temperature comprising (A) a mixture and/or a reaction product of a polydiorganosiloxane having silicon-bonded hydroxyl groups with a compound having silicon-bonded acyloxy groups and (B) filler comprising precipitated barium sulphate comprising particles not more than 10% of which are less than 0.5 microns and not more than 10% of which are more than 2.0 microns. The barium sulphate provides not less than 40% by weight of the composition. Preferred barium sulphates have an average particle size of 1 micron and a particle size distribution thus <IMAGE>