Patent ID: 8182921

Claim:
A foamable, crosslinkable silicone composition which cures to a silicone foam, comprising (A) at least one organosilicon compound bearing radicals suitable for crosslinking; (B) at least one silica reinforcing filler selected from the group consisting of fumed and precipitated silica, the silica being treated or untreated; (C) at least one blowing agent, (D) at least one crosslinking system selected from the group consisting of condensation crosslinking, peroxide-induced addition crosslinking, and noble metal complex-catalyzed addition crosslinking, the crosslinking system suitable for crosslinking with the organosilicon compound (A); (E) at least one silane of formula (1) R 2 R 3 SiR 4 R 5 , wherein R 2 , R 3 , R 4 , and R 5 are a substituent of the formula —OR 6 where R 6 is hydrogen or an organic radical, (F) at least one compound of the formula (2) R 8 R 9 (R 10 O)Si—OR 11 , wherein R 8 and R 9 independently are organic substituents or a linear or branched siloxane having 1-10 Si—O units, and R 10 and R 11 independently are organic substituents, wherein at least one blowing agent (C) is a compound containing intercalated liquid or liquid of crystallization, the blowing agent (C) selected from the group consisting of salts, silicates, proteins, and sugars, and wherein the blowing agent (C) is effective to foam said crosslinkable composition during vulcanization of the crosslinkable silicone composition.