Patents Examined by Derrich G. Hamlin
  • Semiconductive silicone rubber compositions and semiconductive silicone rubber rolls
    Patent number: 6013201
    Abstract: 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.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: January 11, 2000
    Assignee: Shin-Estu Chemical Co., Ltd.
    Inventors: Osamu Hayashida, Tsutomu Nakamura