Patent ID: 7385000

Claim:
A silicone rubber composition comprising (A) 100 parts by weight of at least one diorganopolysiloxane comprising units of the formula (1) R 1 a R 2 b SiO (4-a-b)/2 (1) where R 1 is an unsubstituted or halogen-substituted monovalent hydrocarbon radical which has from 1 to 20 carbon atoms and is free of aliphatic unsaturated groups, R 2 is an unsubstituted or halogen-substituted monovalent hydrocarbon radical which contains at least one aliphatic carbon-carbon multiple bond, and a, b are each a positive number, with the proviso that 1≦a<3, 0<b≦1 and 1<a+b≦3, with each molecule having on average at least two monovalent hydrocarbon radicals containing aliphatic carbon-carbon multiple bonds of this type bound to silicon atoms, (B) from 1 to 100 parts by weight, based on 100 parts by weight of (A), of finely divided silica having a specific surface area, measured by the BET method, of 50-300 m 2 /g, (C) 50-300 parts by weight, based on 100 parts by weight of (A), of at least one aluminum hydroxide powder having a specific surface area, measured by the BET method, of 0.1-20 m 2 /g and an average particle size of 0.05-20 μm, (D) crosslinkers in an amount sufficient to cure the composition, with this crosslinker being selected from the group consisting of (D1) an organic peroxide, hydroperoxide or a mixture of various organic peroxides or hydroperoxides, and (D2) a combination of an organohydrogenpolysiloxane comprising units of the formula (2) R c 3 H d SiO (4-c-d)/2 (2) where R 3 is a substituted or unsubstituted monovalent hydrocarbon radical which is not aliphatically unsaturated, and c, d are each a positive number, with the proviso that 1≦c<3, 0<d≦1 and 1<c+d≦3 and each molecule has on average at least three such hydrogen atoms bound to silicon atoms, and a hydrosilylation catalyst comprising at least one transition metal, and (E) 0.01-10.0 parts by weight, based on 100 parts by weight of (A), of at least one of an inorganic base, inorganic acid, organic acid, organosilicon acid or a compound which liberates an inorganic base, inorganic acid, or organic or organosilicon base or acid on heating, an organic amine, aniline, dimethylalinine, toluidine, pyridine, and their alkyl-substituted derivatives, urea, N-alkylurea derivative, N-triorganylsilylcarbamic ester, N-triorganylsilyl-carbamate, or N-triorganylsilylurea.