| abstract |
ABSTRACT OF THE DISCLOSURE A rubber for 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 (ML1+4121°C) of from 135 to 200, and (c) containing the diolefin units giving an iodine value of from 10 to 35. A rubber composition for sponge is also disclosed, comprising 100 parts by weight of the aforesaid copolymer and from 30 to 130 parts by weight of a plasticizer. |