Bridged bis-fluorenyl metallocenes, process for the preparation

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...

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502117, 556 11, 556 12, 556 20, 556 43, 556 53, 556 81, 526160, 526943, 987 2, B01J 3100, C07F 1700, C08F 460

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06054404&

ABSTRACT:
Metallocene compounds having two fluorenyl ligands bridged with a single silicon or germanium atom, said atom having two substituent groups containing a total of at least four carbon atoms, are useful as catalyst components for the polymerization of olefins. Particularly, it is possible to prepare high molecular weight atactic polypropylene with improved yields with respect to the known catalysts.

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