Semiconductive silicone rubber compositions and semiconductive silicone rubber rolls

摘要

In a silicone rubber composition comprising an organopolysiloxane having at least two aliphatic unsaturated groups and a curing agent, thermal black and/or furnace black having a primary particle diameter of 50-500 nm and a DBP oil absorption of 20-50 cc/100 g is blended. There may be further blended an organopolysiloxane having an ionic group-bearing portion as an antistatic agent and/or a hydrocarbon insulating oil. The composition has a stable resistivity in the semiconductive region and thus is useful as semiconductive rolls.