申请人:MITSUBISHI PETROCHEMICAL CO., LTD.
公开号:EP0261962A2
公开(公告)日:1988-03-30
There is provided a process for producing a propylene block copolymer, which comprises producing a crystalline homopolymer or copolymer of propylene in the former stage in the presence of a Ziegler type catalyst formed of (A) a solid catalyst component comprising magnesium, titanium, a halogen and an electron donor as the essential components and (B) an organic aluminum compound, and polymerizing propylene and ethylene at a polymerization ratio (molar ratio) of 0/100 to 80/20 in the latter stage in the co-presence of said homopolymer or copolymer, characterized in that the latter stage polymerization is carried out in the presence of 1 to 40 mole of an alkoxytitanium compound per mole of the titanium in the above component (A).
提供了一种生产丙烯嵌段共聚物的工艺,该工艺包括在前一阶段在齐格勒型催化剂存在下生产丙烯的结晶均聚物或共聚物,齐格勒型催化剂由(A)固体催化剂组分和(B)有机铝化合物组成,固体催化剂组分由镁、钛、卤素和电子供体作为基本成分、在后一阶段,在上述均聚物或共聚物的共同存在下,以 0/100 至 80/20 的聚合比(摩尔比)聚合丙烯和乙烯,其特征在于后一阶段的聚合是在上述组分(A)中每摩尔钛含有 1 至 40 摩尔烷氧基钛化合物的存在下进行的。