Process and catalyst for producing isotactic polyolefins

Details Process and catalyst for producing isotactic polyolefins Process and catalyst for producing isotactic polyolefins

1991-10-07

1995-05-16

Dees, Jose G.

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

Organic compounds

Heavy metal containing

556 11, 556 12, 556 1, 556 22, 556 23, 556 27, 556 28, 556 54, 556 43, 556 58, 556 56, 502103, 502117, 526160, C07F 1700, C07F 900, C07F 1100

Patent

active

054162289

ABSTRACT:
This invention is for a metallocene catalyst component useful in preparing isotactic polyolefins, a catalyst system using this component and a process for polymerizing olefins using the catalyst component. The catalyst component consists of a bridged metallocene in which one of the cyclopentadienyl rings is substituted in a different manner from the other ring. One of the cyclopentadienyl ligands contains a bulky group in one and only one distal position and the other cyclopentadienyl ligand has bilateral or pseudobilateral symmetry. There is a steric difference between the two Cp rings.
The catalyst component is a stereorigid metallocene described by the formula:

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