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Modification of Ziegler-Natta catalysts by cyclopentiadienyl-type ligands: Activation of titanium-based catalysts

✍ Scribed by J. Dupuy; R. Spitz

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 140 KB
Volume: 65
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19970919)65:12<2281::aid-app3>3.0.co;2-5

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✦ Synopsis

Conventional Ziegler-Natta catalysts, based on TiCl 4 supported on MgCl 2 , were modified by substituting a part of the chlorides by cyclopentadienyl (and derivatives) ligands. Although these catalysts are very active (activities up to 10 5 g PE/g catalyst/h) they exhibit a conventional Ziegler-Natta behavior (methylaluminoxane is not necessary, polyethylene produced with a rather broad molar weight distribution, low sensitivity to hydrogen). It was attributed to cluster effects: an increase of the number of conventional TiCl 4 active sites by adding cyclopentadienyl ligands on titanium neighbors.

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