Sughrue, Mion, Zinn Macpeak & Seas
Rubber for sponge and rubber composition for sponge
 A sponge is disclosed, comprising a copolymer of ethylene, an .alpha.-olefin, and a diolefin, said copolymer (a) containing the ethylene units and the .alpha.-olefin units at a weight ratio of from 73:27 to 40:60, (b) having a Mooney viscosity (ML.sub.1+4 121.degree. C.) of from 135 to 200, and (c) containing the diolefin units giving an iodine value of from 10 to 36. A sponge composition is also disclosed, comprising 100 parts by weight of the aforesaid copolymer and from 30 to 130 parts by weight of a plasticizer. 
Sumitomo Chemical Co., Ltd.
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Hideaki Keisaku Kohichi
Yamada Yamamoto Iketani