Patent ID: 8101254

Claim:
A rubber composition comprising an ethylene/α-olefin/non-conjugated polyene copolymer (A), and a polyolefin resin (B) and/or an ethylene/C3-C20 α-olefin copolymer (C), wherein (1) a maximum value Pmax and a minimum value Pmin of an ethylene distribution parameter P of the ethylene/α-olefin/non-conjugated polyene copolymer (A), as determined by the following measuring method (X), have a relationship of Pmax/Pmin≦1.4, measuring method (X): a test sample obtained by dissolving the ethylene/α-olefin/non-conjugated polyene copolymer (A) in cyclohexane is subjected to measurement with GPC-offline-FTIR using cyclohexane as an eluent under the conditions of a flow rate of 1.0 ml/min and a temperature of 60° C., and a peak intensity ratio (A721 cm −1 /A4320 cm −1 ) of a maximum peak (A721 cm −1 ) of the resulting spectrum in the range of 721±20 cm −1 to a maximum peak (A4320 cm −1 ) thereof in the range of 4320±20 cm −1 is regarded as an ethylene distribution parameter P, and (2) the B value of the ethylene/C3-C20 α-olefin copolymer (C), which is represented by the following formula (i), is not more than 1.05, B value=[ EX ]/(2 [E]×[X ]) (i) wherein [E] and [X] are molar fractions of ethylene and the α-olefin of 3 to 20 carbon atoms, respectively, and [EX] is a fraction of dyad sequence of ethylene/α-olefin of 3 to 20 carbon atoms.