Two-component silicone rubber

Claim 1

A vulcanized silicone rubber produced by mixing and vulcanizing a two-component system, component I consisting essentially of (a) about 20 to 100 parts by weight of a linear organopolysiloxane of the formula ##STR6## in which R each independently is a monofunctional hydrocarbon radical, and n is a positive integer of a value such that the viscosity amounts to between about 500 and 1,000,000 cP at a temperature of 25° C., (b) 0 to about 50 parts by weight of a linear organopolysiloxane of the formula ##STR7## in which n is a positive integer of a value such that the viscosity amounts to between about 5 and 1,000 cP at a temperature of 25° C., (c) 0 to about 20 parts by weight of a linear organopolysiloxane of the formula ##STR8## in which R and n are as defined above, m is a positive integer of a value such that the viscosity amounts to between about 2 and 50 cP at a temperature of 25° C., (d) about 10 to 50 parts by weight of a very finely divided pyrogenic silica with a specific surface area according to BET of at least about 50 m 2 /g, and (e) 0 to about 100 parts by weight of another filler or pigment, component I being a mixture obtained by mixing constituents a) and d) in the presence of water and a modifying agent of the formula (R.sub.3 Si).sub.p X in which R and n are as defined above, p is 1 or 2, X is OH, OR, halogen, S, OOCR, NH, NH 2 , NHY, NY or NY 2 , and Y is a monofunctional hydrocarbon radical, and subsequently adding the constituents (b), (c) and (e), and component II consisting essentially of (f) about 20 to 50 parts by weight of a silicic acid ester of the formula (RO).sub.3 SiR' in which R is as defined above, R' is an alkyl or alkoxy radical with up to 6 carbon atoms, (g) about 1 to 20 parts by weight of a catalytically active heavy metal compound, and (h) 0 to about 50 parts by weight of a monohydric aliphatic alcohol of the formula (R--(CH.sub.2).sub.a --OH in which R is as defined above, and a is an integer from 1 to about 10.