RUBBER COMPOSITION, CROSSLINKED RUBBER ARTICLE, AND RUBBER ROLL

摘要

PROBLEM TO BE SOLVED: To provide a crosslinked rubber article with a volume resistivity value low in dispersion. SOLUTION: The rubber composition comprises 100 pts.wt. of an epihalohydrin open ring copolymer rubber containing (a) 10-100 mol% of an epihalohydrin monomer, (b) 0-70 mol% of an alkylene oxide monomer, and (c) 0-20 mol% of a monomer that comes into open ring copolymerization with said two components (a) and (b), (1) 5-80 pts.wt. of carbon black with its DBP oil absorption of 60 cm3/100 g or less and its average grain diameter of 70 nm or more, and (2) 2-20 pts.wt. of carbon black with its DBP oil absorption of 140 cm3/100 g or more and its average grain diameter 50 nm or less. The rubber composition is crosslinked by a crosslinking agent.