A branched alpha-olefinic polymer composition having excellent melt flowability, good moldability and excellent melt tension and comprising at least two branched alpha-olefinic polymers each composed of (A) recurring units derived from a branched alpha-olefin containing 5 to 10 carbon atoms and having a branch at the 3-position or a position of a higher number and (B) recurring units derived from a linear alpha-olefin containing 2 to 20 carbon atoms; and a process for producing this polymer composition by a multiplicity of polymerization steps using a catalyst formed from (A) a highly stereoregular titanium catalyst component comprising magnesium, titanium, halogen and an electron donor as essential ingredient, (B) an organoaluminum compound and (C) an electron donor.
一种支链α-烯烃聚合物组合物,具有优异的熔体流动性、良好的成型性和优异的熔体张力,并包含至少两种支链α-烯烃聚合物,每种聚合物由(A)衍生自含有5至10个碳原子且在3位或更高位有分支的支链α-烯烃的递归单元和(B)衍生自含有2至20个碳原子的线性α-烯烃的递归单元组成;以及一种通过多个聚合步骤生产该聚合物组合物的工艺,该工艺使用的催化剂由以下部分组成:(A)由
镁、
钛、卤素和电子供体作为基本成分的高度立体配位的
钛催化剂组分,(B)
有机铝化合物和(C)电子供体。