| abstract |
(57) Abstract: A rubber composition for an injection sponge according to the present invention comprises an α-olefin / non-conjugated polyene copolymer rubber having 3 to 20 carbon atoms of ethylene and a crystal having a melting point of 100 to 150 ° C. It contains a reactive polyolefin resin and a foaming agent in a specific ratio. This rubber has a molar ratio of ethylene to α-olefin of 60. / 40-80 / 20, the intrinsic viscosity measured in decalin at 135 ° C is in the range of 0.7-2 dl / g and the iodine value is 10 In the range of ~ 50. The vulcanized rubber foam molded article of the present invention is obtained by vulcanizing and foaming this composition. The rubber composition described above can provide a vulcanized rubber foam having excellent vulcanization properties such as weather resistance, heat resistance, ozone resistance and tear strength. Moreover, this rubber composition is excellent in precision moldability and productivity of a vulcanized rubber foam molded article in transfer molding, injection molding, and mold molding. |