Montell Technology Company Bv

Basell Technology Company B.v.

Lin-Chen Yu

Luigi Resconi

Vu Anh Dang

Tiziano Dall'Occo

Maurizio Stefano Galimberti

Fabrizio Piemontesi

Davide Balboni

Robert L Jones, Jr

Krishna Raman

Clyde E Bishop

Colin John Schaverien

Alessia Boscarato

A class of bridged or unbridged metallocene compounds is disclosed, wherein the cyclopentadienyl ligands have two or four adjacent substituents forming one or two alkylenic cycles of from 4 to 8 carbon atoms. These metallocenes are useful as catalyst components for the polymerization of olefins, particularly for the (co)polymerization of ethylene and for the polymerization of propylene.

Metallocene compounds and use thereof in catalysts for the polymerization of olefins

Bridged metallocenes, preparation, use in catalytic systems

It is disclosed a new class of bridged metallocene compounds of formula (I):

Metallocene compounds and their use in catalysts for the polymerization of olefins

A process for preparing bis-cyclopentadienyl compounds bridged by a methylene group is reported, said process comprising reacting formaldehyde with a cyclopentadienyl compound in the presence of a base and of a solvent having a dielectric constant (.epsilon.), measured at 25.degree. C., higher than 7. The bridged compounds, obtainable in high yields with this simple single-step process, can be used to prepare ansa-metallocenes, active as catalyst components in the polymerization of olefins.

Process for preparing cyclopentadienyl compounds

Fractionable, reactor blend polypropylenes, directly obtainable from the polymerization reaction of propylene, having:

Reactor blend polypropylene, process for the preparation thereof and

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Hockessin, DE, United States of America

Lin-Chen Yu