Hafnium metallocene compound

Details Hafnium metallocene compound Hafnium metallocene compound

1995-05-30

1997-10-21

Wu, David W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

556 11, 556 12, 556 13, 556 19, 556 20, 556 21, 556 27, 556 52, 556 53, 502155, 526127, 526160, 526943, C07F 710

Patent

active

056798113

ABSTRACT:
A very efficient catalyst system for the polymerization of 1-olefins consists of an aluminoxane and a metallocene which is a compound of the formula I ##STR1## in which R.sup.1 and R.sup.2 denote hydrogen atoms, halogen atoms or hydrocarbon radicals and R.sup.3 and R.sup.4 are mononuclear or polynuclear hydrocarbon radicals which can form a sandwich structure with the central atom and which are linked to one another by a --R.sup.6.sub.m --R.sup.5 --R.sup.7.sub.n -- bridge containing a hetero atom and consisting of one or several members.
The catalyst system produces polymers having a high molecular weight.

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