Bridged bis-fluorenyl metallocenes, process for the preparation

Details Bridged bis-fluorenyl metallocenes, process for the preparation Bridged bis-fluorenyl metallocenes, process for the preparation

1996-03-01

1998-07-28

Bell, Mark L.

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

Organic compounds

Heavy metal containing

556 12, 556 20, 556 43, 556 53, 556 56, 556 81, 526160, 526943, 502103, 502117, C07F 900, C07F 1700, C07F 700, C07F 728

Patent

active

057864950

ABSTRACT:
Metallocene compounds of a Group 4 or 5 metal 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.

REFERENCES:
patent: 4668773 (1987-05-01), Marks et al.
patent: 5120867 (1992-06-01), Welborn, Jr.
patent: 5401817 (1995-03-01), Palackal et al.
patent: 5436305 (1995-07-01), Alt et al.
patent: 5504223 (1996-04-01), Rosen et al.
patent: 5571880 (1996-11-01), Alt et al.
patent: 5585509 (1996-12-01), Langhauser et al.

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