Patent ID: 8354468

Claim:
A thermoplastic elastomer composition obtained by dynamically heating a polymer composition in the presence of a crosslinking agent, the polymer composition comprising an α-olefin thermoplastic resin (A), and an oil-extended ethylene copolymer (B), wherein B comprises: an ethylene copolymer having a limiting viscosity [η] measured at 135° C. in a decalin solvent of 5.5 to 9.0 dl/g, and a ratio, Mw/Mn, of weight average molecular weight, Mw, to number average molecular weight, Mn, of 3 or less; and 50 to 150 parts by mass of a first mineral oil-based softener based on 100 parts by mass of the ethylene copolymer, the content of the oil-extended ethylene copolymer (B) is 30 mass % or more based on the total amount, 100 mass %, of a polymer component comprising the α-olefin thermoplastic resin (A) and the oil-extended ethylene copolymer (B), wherein the ethylene copolymer is an ethylene-α-olefin-nonconjugated polyene copolymer.