| abstract |
(57) 【Abstract】 PROBLEM TO BE SOLVED: An ethylene-based copolymer oil-extended rubber composition which is excellent in processability, compression set, anti-vibration properties and the like, and does not deteriorate in various properties even if a large amount of a filler is added. Provide things. SOLUTION: An ethylene-based copolymer oil-extended rubber composition containing 10 to 150 parts by weight of extender oil with respect to 100 parts by weight of the following copolymer. Copolymer: a copolymer composed of ethylene, α-olefin having 6 to 12 carbon atoms or a mixture thereof with propylene, and a cyclic non-conjugated diene, wherein (1) the total amount of ethylene and propylene and 6 carbon atoms. ˜12 to α-olefin, molar ratio 70/30 to 5/95, (2) iodine value 0.5 -50, (3) a polystyrene-converted weight average molecular weight (Mw) of 450,000 to 3,000,000, and (4) a GPC-based Mw / Mn2 to 8 (Mn is a polystyrene-converted number average molecular weight). |