ORGANOPOLYSILOXANES MODIFIED BY GRAFT POLYMERIZATION OF VINYL MONOMERS AS WELL AS THEIR USE IN CURABLE COMPOSITIONS

摘要

{PG,1 Modified organopolysiloxane compositions containing in situ generated particulate matter and a method for preparing the same which comprises polymerizing organic monomers having aliphatic unsaturation in the presence of vinyl containing organopolysiloxanes and free radical initiators at an elevated temperature to form a composition in which one or more of the organopolysiloxane molecules have organic groups grafted thereto through a carbon-to-carbon linkage. The resultant composition may be cured to an elastomeric solid by combining the composition obtained from the polymerization with organosilicon compounds having an average of more than two hydrogen atoms per molecule and a catalyst which promotes the addition of SiH groups to vinyl groups.