Millen, White, Zelano, & Branigan, P.C.
Semiconductive silicone rubber compositions and semiconductive silicone rubber rolls
 The invention provides a semiconductive silicone rubber composition comprising (A) an organopolysiloxane containing at least two aliphatic unsaturated groups, (B) reinforcing silica powder having a specific surface area of at least 50 m.sup.2 /g, (C) a conductive agent, (D) a hydrocarbon oil having a heat loss of up to 30% at 200.degree. C./4 hours, and (E) a curing agent. Cured silicone rubber of the composition has a resistance of 1.times.10.sup.3 to 1.times.10.sup.12 .OMEGA. which remains stable for long-term use. The semiconductive silicone rubber composition is appropriate as a semiconductive roll stock for the manufacture of charging rolls, transfer rolls and developing rolls in business machines. 
Oki Data Corporation Shin-Etsu Chemical Co., Ltd.
G G G G C Y G Y Y
G03G G03G G03G G03G C08K Y10T G03G Y10T Y10T
additional inventional inventional additional inventional additional inventional additional additional
Tsutomu Satao Hirokazu Hiroshi Takao
Nakamura Hirabayashi Ando Kikuchi Mizutani