| abstract |
The present invention relates to a grinding silicone rubber composition, characterized in that it comprises: (A) two green alkenyl organopolysiloxane rubbers (A-1) and (A-2), namely a rubber of raw organopolysiloxane comprising a molecular chain which is represented by a particular empirical formula and wherein each of both ends has been blocked with a trialkenylsiloxy group and a raw organopolysiloxane rubber comprising a molecular chain which is represented by a particular empirical formula and wherein both ends were blocked with a monoalkenyldialkylsiloxy group; (B) an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to a silicon atom in the molecule; (C) carbon black having an average primary particle diameter of 100 to 350 nm; (D) reinforcing fumed silica having a specific surface, as determined by the BET adsorption method, greater than or equal to 50 m 2 / g; and (E) a platinum group metal catalyst. This crushable silicone rubber composition has excellent electric field relaxation capability, high elongation at break, permanent deformation produced by reduced tensile force, and high dielectric or insulating properties. |