| 摘要 |
PROBLEM TO BE SOLVED: To obtain an addition-curing type electroconductive silicone rubber composition which is suitable as a material for a developing roll of an electrophotographic imaging apparatus such as an electrophotographic printer, a copying machine, etc., and provides electroconductive silicone rubber having low hardness and low distortion. SOLUTION: The electroconductive silicone rubber composition comprises (A) 100 parts wt. of an organopolysiloxane selected from the group consisting of an organopolysiloxane having a side-chain alkenyl group in a specific ratio and a degree of polymerization in a specified range and an organopolysiloxane containing alkenyl groups at both molecular chain terminals and a degree of polymerization in a specific range, (B) an organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms in one molecule in an amount which adjusts the number of the hydrogen atoms bonded to the silicon atoms in the component to 0.1-3.0 per alkenyl group that the organopolysiloxane in the component (A) has, (C) 0.2-30 parts wt. of carbon black, (D) an effective amount of a platinum-based catalyst and (E) 5-500 parts wt. of an inorganic filler. COPYRIGHT: (C)2004,JPO
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