申请人:Enichem S.p.A.
公开号:EP0955304A2
公开(公告)日:1999-11-10
A "bridged" bis-cyclopentadienyl complex which can be advantageously used for the formation of a catalytic system active in the (co)polymerization of ethylene and other α-olefins is represented by means of the following formula (II):
wherein:
M represents a metal selected from titanium, zirconium or hafnium;
A' and A'' each independently represent an anion containing an η5-cyclopentadienyl ring coordinated to M;
R' or R'' each independently represents a group of an anionic nature σ-bound to the metal M;
B represents an unsaturated bivalent organic residue having from 1 to 30 carbon atoms, bound, respectively, to the ring of group A' and to the -CH2- methylene group by means of unsaturated carbon atoms.
This complex, combined with a suitable cocatalyst, forms a catalyst with a high activity in the polymerization of olefins, producing polymers with a high molecular weight, especially in the case of the copolymerization of ethylene with a second α-olefin.
一种 "桥接 "双环戊二烯络合物可用于形成在乙烯和其他 α-烯烃的(共)聚合反应中具有活性的催化体系,其 "桥接 "双环戊二烯络合物用下式 (II) 表示:
其中
M 代表选自钛、锆或铪的金属;
A' 和 A''各自独立地代表含有与 M 配位的η5-环戊二烯基环的阴离子;
R'或 R''各自独立地代表与金属 M σ 结合的阴离子性质的基团;
B 代表具有 1 至 30 个碳原子的不饱和二价有机残基,通过不饱和碳原子分别与基团 A' 的环和 -CH2- 亚甲基结合。
这种复合物与合适的助催化剂结合,可形成一种在烯烃聚合过程中具有高活性的催化剂,产生高分子量的聚合物,特别是在乙烯与第二种α-烯烃共聚的情况下。