| 摘要 |
A high-expanded crosslinked foam having excellent flexibility, toughness, heat resistance and compressibility, a smooth surface and uniform cells, and a polyolefin resin composition to be used therefore are provided. A polyolefin-based crosslinked foam has the following characteristics (a) to (c) and is obtained by the crosslinked foaming of a foaming polyolefin resin composition comprising a polyolefin resin composition and a foaming agent:(a) Gel fraction is from 10% to 90%;(b) Degree of swelling is 30 or less; and(c) When glass transition point determined from the temperature dependence of dynamic viscoelasticity is represented by the peak of tan delta determined by the measurement of dynamic viscoelasticity at a frequency of 10 Hz, there is observed no peak or one peak, if any, and the ratio alpha of storage modulus at 0° C. (E'0) to storage modulus at 100° C. (E'100) (alpha=log E'0/E'100) is from 10 to 30.
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