Bimetallocyclic transition metal catalyst systems

Details Bimetallocyclic transition metal catalyst systems Bimetallocyclic transition metal catalyst systems

1995-06-07

2000-11-07

Bell, Mark L.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Plural component system comprising a - group i to iv metal...

502113, 502117, 502152, 502154, 502158, 502162, 502167, 526127, 526160, 526161, B01J 3100, B01J 3700, C08F 402, C08F 460

Patent

active

061436828

ABSTRACT:
This invention relates to single site catalyst systems comprising activated bimetallocyclic transition metal compounds, and the use of these catalyst systems for the polymerization of ethylenically and acetylenically unsaturated monomers. The bimetallocyclic compounds comprise two metal atoms, selected from the group consisting of Group 4 or Group 5 metal atoms, connected through two covalent bridging links so as to form a cyclic compound having delocalized bonding in the cyclic structure. The exemplary bimetallocyclic compound bis-M-(trimethylsilyl-methylidyne) tetrakis-(trimethylsilylmethyl) ditantalum activated with alumoxane and borate compounds is shown to be useful for preparing ethylene polymers having M.sub.n of at least 267,000 and MWD of about 2.3.

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