To provide conductive rubber compositions having a low hardness and a low compressive set, and conductive rolls using conductive rubbers formed from these rubber compositions as rubber materials.
Rubber compositions comprise (A) an ethylenic copolymer rubber composed of ethylene, a 4-12C α-olefin and a non-conjugated diene which meets the following (1)-(4) requirements: (1) a molar ratio of ethylene to the 4-12C α-olefin of 5/95-80/20; (2) an iodine value of 5-45; (3) a Mooney viscosity (ML1+4, 100°C) of 20-150; and (4) a glass transition temperature, obtained by a differential scanning calorimeter, of -80--50°C and, preferably an additional requirement: an index B of degree of branching of 0.60-0.95, (B) a vulcanizing agent and/or a crosslinking agent, and (C) a conductive substance.
NAKAMURA TOSHIBUMI
HASEGAWA TORU
HASEGAWA KENJI
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