Poly(olefinic monomer) filled-poly(organosiloxane) compositions

Claim 1

A room temperature vulcanizable composition consisting essentially of: (A) a stable dispersion consisting essentially of two phases: (i) a continuous phase consisting essentially of ungrafted linear fluid poly(diorganosiloxane) containing terminal silicon-bonded hydroxy groups which is substantially free of aliphatic unsaturation and silanic hydrogen and having a viscosity of 100 to 10,000,000 centipoise at 25° C. and intimately dispersed therein (ii) a discontinuous phase consisting essentially of finely divided solid particles of an ungrafted polymer prepared from an organic monomer having aliphatic unsaturation or a mixture of such monomers polymerized in the presence of said linear fluid poly(diorganosiloxane); (B) a crosslinking agent selected from the group consisting of (1) a monomeric organosilicate corresponding to the formula: (R.sup.3 O).sub.3 SiR.sup.4 wherein R 3 is a radical selected from the group consisting of a monovalent hydrocarbon radical, a halogenated monovalent hydrocarbon radical and a cyanoalkyl radical, and R 4 is selected from the group consisting of alkyl, haloalkyl, arylhaloalkyl, alkenyl, cycloalkyl, cycloalkenyl, cyanoalkyl, alkoxy and aryloxy and (2) a partial liquid hydrolysis product of the aforementioned organo silicates; and (C) a crosslinking catalyst.