Metallocenes and catalyst compositions derived therefrom

Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing

Reexamination Certificate

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C556S052000, C556S051000, C526S160000, C526S170000, C526S943000

Reexamination Certificate

active

10495939

ABSTRACT:
Metallocenes and catalyst systems for olefin polymerization derived therefrom. The metallocenes may be represented by the formula:wherein M1preferably is zirconium or hafnium; and R5is different from hydrogen.

REFERENCES:
patent: 5770753 (1998-06-01), Kuber et al.
patent: 5840644 (1998-11-01), Küber et al.
patent: 5936053 (1999-08-01), Fukuoka et al.
patent: 6380120 (2002-04-01), Burkhardt et al.
patent: 6583238 (2003-06-01), Gores et al.
patent: 2005/0054520 (2005-03-01), Hart et al.
patent: 0 654 476 (1995-05-01), None
patent: 0 752 428 (1997-01-01), None
patent: WO 98/40331 (1998-09-01), None
patent: WO 98/40419 (1998-09-01), None
patent: WO 99/42497 (1999-08-01), None
patent: WO 99/50274 (1999-10-01), None
patent: WO 99/50312 (1999-10-01), None
patent: WO 01/58913 (2001-08-01), None
Abstract for EP 0 654 476, published May 24, 1995.

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