The present invention provides a thermoplastic elastomer composition comprising a high-molecular-weight thermoplastic elastomer, a low-molecular-weight thermoplastic elastomer affinitive for the high-molecular-weight thermoplastic elastomer, and a rubber component. The ratio of the number-average molecular weight (Mn1) of the high-molecular-weight thermoplastic elastomer to the number-average molecular weight (Mn2) of the low-molecular-weight thermoplastic elastomer is not less than 1.2 nor more than 500. The rubber is dynamically cross-linked and dispersed in the thermoplastic elastomers. Further, the present invention provides a thermoplastic elastomer composition consisting of a mixture of a thermoplastic elastomer composition (F) containing a high-molecular-weight styrene thermoplastic elastomer having a number-average molecular weight not less than 80,000; a composition (G) consisting of a polar termination-modified thermoplastic elastomer and/or a polar-nonpolar graft polymer; and a rubber compound (H) containing EPDM as a main component thereof. The rubber component of the mixture is dynamically cross-linked and dispersed in the thermoplastic elastomers.
本发明提供了一种热塑性弹性体组合物,该组合物包括高分子量热塑性弹性体、高分子量热塑性弹性体的低分子量热塑性弹性体亲和剂和橡胶成分。高分子量热塑性弹性体的数均分子量(Mn1)与低分子量热塑性弹性体的数均分子量(Mn2)之比不小于 1.2 也不大于 500。橡胶动态交联并分散在热塑性弹性体中。此外,本发明还提供了一种热塑性弹性体组合物,该组合物包括一种热塑性弹性体组合物(F)的混合物,其中含有一种数均分子量不小于 80,000 的高分子量
苯乙烯热塑性弹性体;一种组合物(G),其中包括一种极性终止改性热塑性弹性体和/或一种极性-非极性接枝聚合物;以及一种以三元
乙丙橡胶为主要成分的橡胶化合物(H)。混合物中的橡胶成分动态交联并分散在热塑性弹性体中。