申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0385765A2
公开(公告)日:1990-09-05
A catalyst for polymerization of an olefin, said catalyst being formed from
[A] a solid titanium catalyst component comprising magnesium, titanium, halogen and an electron donor as essential ingredients,
[B] an organoaluminum compound catalyst component, and
[C] an electron donor catalyst component comprising at least two electron donors including an electron donor (1) and an electron donor (2), the MFR (a) of homopolypropylene obtained by using the electron donor (1) together with the solid titanium catalyst component [A] and the organoaluminum compound catalyst component [B] has the following relation to the MFR (b) of homopolypropylene obtained by using the electron donor (2) under the same polymerization conditions as in the case of using the electron donor (1)
log [MFR (b)/MFR (a)]≧1.5.
This catalyst can give an olefin polymer having a broad molecular weight. Also provided is a process for polymerizing or copolymerizing an olefin in the presence of the above catalyst.
一种用于烯烃聚合的催化剂,所述催化剂由以下物质组成
[A] 固态钛催化剂组分,其主要成分包括镁、钛、卤素和电子供体、
[B] 一种有机铝化合物催化剂组分,以及
[C] 电子供体催化剂组分,由至少两个电子供体组成,包括电子供体 (1) 和电子供体 (2),在与使用电子供体 (1) 相同的聚合条件下,使用电子供体 (1) 与固体钛催化剂组分 [A] 和有机铝化合物催化剂组分 [B] 一起得到的均聚丙烯的 MFR (a) 与使用电子供体 (2) 得到的均聚丙烯的 MFR (b) 具有如下关系
对数[MFR (b)/MFR (a)]≧1.5。
这种催化剂可以得到具有宽分子量的烯烃聚合物。还提供了一种在上述催化剂存在下聚合或共聚烯烃的工艺。