Patent ID: 7166363

Claim:
A highly heat conductive silicone rubber composition for fixing rolls or belts, comprising (A) 100 parts by weight of an organopolysiloxane having at least two silicon atom-bonded alkenyl radicals in a molecule which is liquid at room temperature, (B) 0.1 to 30 parts by weight of a liquid organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule which has a viscosity of up to 1,000 mPa·s at 25° C., (C) 100 to 1,000 parts by weight of a highly heat conductive inorganic powder comprising a blend of two inorganic powders selected from (C-1) and (C-2), a combination of (C-2) and (C-3), and a combination of magnesium oxide in (C-1) and alumina in (C-3) in a weight ratio between 1/9 and 9/1, (C-1) a highly heat conductive inorganic powder selected from the group consisting of alumina and magnesium oxide which forms a 30% slurry having a pH value of at least 8, (C-2) a highly heat conductive inorganic powder selected from the group consisting of group quartz and zinc oxide which forms a 30% slurry having a pH value of 6 to less than 8, and (C-3) a highly heat conductive inorganic powder consisting of alumina which forms a 30% slurry having a pH value of less than 6, and (D) a catalytic amount of an addition reaction catalyst.