A unique thermoplastic olefin composition having: (a) at least 40 percent by weight of a propylene-alpha olefin copolymer based on the total weight of polymers in the composition, the propylene-alpha olefin copolymer having at least 60 percent by weight units derived from propylene, at least 6 percent by weight units derived from an alpha olefin, a moleculare weight distribution less than 3.5, and a broad composition distribution; and (b) at least 20 percent by weight of a polypropylene based on the total weight of polymers in the composition, the polypropylene having at least 93 percent by weight units derived from propylene, a molecular weight distribution of greater than 3.5, a heat of fusion greater than the heat of fusion exhibited by the propylene-alpha olefin copolymer, and a melting point T
max
of at least 120° C.
                            一种独特的热塑性聚烯烃组合物,其包括:(a) 在组合物中聚合物的总重量基础上,至少40重量%的
丙烯-α烯烃共聚物,该
丙烯-α烯烃共聚物至少60重量%的单元来源于
丙烯,至少6重量%的单元来源于α烯烃,分子量分布小于3.5,以及广泛的组成分布;以及(b) 在组合物中聚合物的总重量基础上,至少20重量%的聚
丙烯,该聚
丙烯至少93重量%的单元来源于
丙烯,分子量分布大于3.5,熔融热大于
丙烯-α烯烃共聚物所表现出的熔融热,并且最高熔点Tmax至少为120℃。