| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rubber roll useful as an electrified roll for OA (office automation) devices, etc., having conductive stability in a 10<6> to 10<10>Ωrange, by blending a specific polyorganosiloxane with prescribed iron oxide powder or ferrite powder. SOLUTION: This rubber roll is obtained by uniformly coating a mandrel with a silicone rubber composition prepared by blending (A) 100 pts.wt. of a polyorganosiloxane of the average composition formula Rn SiO(4-a)/2 [R is a 1-10C (non)substituted monofunctional hydrocarbon; (a) is 1.95-2.05] with (B) 50-500 pts.wt. of iron oxide powder of the formula (FeO)x (Fe2 O3 )y (x+y=1, 0.5<=x<=1, 0<=y<=0.5) or ferrite powder of the formula MO.Fe2 O3 (M is a metal atom selected from Fe, Cu, Ni, Mg, Co, Zn and Ba) and (C) a necessary amount of a curing agent (e.g. 2,5-dimethyl-2,5-di-t-butyl peroxide).
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