An olefin thermoplastic elastomer composition comprising 10 to less than 60 parts by weight of a crystalline polyolefin resin (A) and 90 to more than 40 parts by weight of an ethylene/α-olefin/nonconjugated polyene copolymer rubber (B), the total amount of components (A) and (B) being 100 parts by weight, said rubber (B) being obtainable by random copolymerization of ethylene, an α-olefin having 3 to 20 carbon atoms and a nonconjugated polyene in the presence of a metallocene catalyst and having:
(1) a molar ratio of (a) units derived from ethylene to (b) units derived from the α-olefin having 3 to 20 carbon atoms of 40:60 to 95:5 ((a):(b));
(2) an iodine value of 1 to 50; and
(3) an intrinsic viscosity (η), as measured in decalin at 135°C, of 0.1 dl/g to 10 dl/g.
一种烯烃热塑性弹性体组合物,包括 10 至小于 60 重量份的结晶聚烯烃
树脂 (A) 和 90 至大于 40 重量份的
乙烯/α-烯烃/非共轭聚烯共聚物橡胶 (B)、组分(A)和(B)的总量按重量计为 100 份,所述橡胶(B)可通过
乙烯、具有 3 至 20 个碳原子的α-烯烃和非共轭聚烯在茂
金属催化剂存在下进行无规共聚而获得,并具有以下特点
(1) (a)
乙烯衍生单元与(b)具有 3 至 20 个碳原子的α-烯烃衍生单元的摩尔比为 40:60 至 95:5 ((a):(b));
(2)
碘值为 1 至 50;以及
(3) 内在粘度 (η),在 135°C 的
癸醛中测量,为 0.1 分升/克至 10 分升/克。