| 摘要 |
The olefin thermoplastic elastomer of the invention has an islands-sea structure, in which the average particle diameter of the islands phases is not more than 2 mum, and has a gel fraction ranging from 0.5 to 15% by weight and a quantity of heat of melt at a temperature of 125° C. or below, as measured in a different scanning calorimeter (DSC), of 40% or more of the total quantity of heat of melt. The olefin thermoplastic elastomer can be obtained by melt blending in the presence of a crosslinking agent of a specific amount a blend that contains specific amounts of: a high density polyethylene having a density of 0.940 g/cm<3 >or more, or a crystalline ethylene polymer having a crystallinity determined by a DSC method of 10% or more and a density of less than 0.940 g/cm<3>, an ethylene/alpha-olefin(/non-conjugated polyene) copolymer rubber comprising ethylene, an alpha-olefin of 3 to 20 carbon atoms and optionally a non-conjugated polyene, and a polypropylene.
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