| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition having low hardness, thermal conductivity and heat resistance, for providing a stable image for a long period of time in the case of use as a covering material for a toner fixation roll for electrophotography, by blending a heat curing type silicone rubber with a specific amount of prescribed alumina. SOLUTION: This composition is obtained by blending (A) 100 pts.wt. of a heat curing type silicone rubber (e.g. one comprising a polyorganosiloxane to be a base polymer, silica powder, an additive, a curing agent, etc.) with (B) 20-500 pts.wt., preferably 50-400 pts.wt. of alumina having <=50 ppm, preferably 50-10 ppm sodium content and 5-50μm, preferably 10-30μm particle diameter.
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