| abstract |
(57) [Summary] (Solution) An ethylene / α-olefin / non-conjugated polyene copolymer rubber comprising ethylene, an α-olefin having 3 to 20 carbon atoms, and a non-conjugated polyene, a) The molar ratio of ethylene to α-olefin having 3 to 20 carbon atoms [ethylene / α-olefin] is 40/60 to 90/1. 0, (b) the non-conjugated polyene content is in the range of 1 to 50 in iodine value, and (c) the intrinsic viscosity [η] measured in decalin at 135 ° C. is 2.2 to 6.0 dl. / G Of the range, (d) an ethylene-alpha-olefin-nonconjugated polyene copolymer rubber weight fraction X R of the rubber composition is in the range of 0.16~0.29 (A), and crystalline Or a thermosetting rubber composition for a sponge, characterized by containing an amorphous synthetic resin (B); and a vulcanized rubber foam formed by vulcanizing and foaming the rubber composition. [Effect] By vulcanizing and foaming, a sponge rubber having excellent high filling property and foaming property is provided. |