Si-N-Si-bridged metallocenes, their production and use

Details Si-N-Si-bridged metallocenes, their production and use Si-N-Si-bridged metallocenes, their production and use

1999-01-19

2000-07-11

Nazario-Gonzalez, Porfirio

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Plural component system comprising a - group i to iv metal...

502117, 526128, 526160, 526348, 526351, 526352, 526943, 556 11, 556 12, 556 53, C07F 1700, B01J 3100, C08F 4642

Patent

active

06087290&

ABSTRACT:
Novel Si--N--Si bridged metallocenes of the formula [L--Si--Me.sub.2 NRSiMe.sub.2 L]MX.sub.2 wherein L is a C.sub.5 H.sub.4, C.sub.9 H.sub.6, or C.sub.13 H.sub.8 radical, R is alkyl and M is zirconium, titanium, or hafnium, and X is selected from the group consisting of chlorine, bromine, iodine, methyl and diethyl amine, are provided via a novel amine elimination reaction followed by cyclization of the ligand sphere of the amino silyl functionalized metallocene dichloride complex. Further, there is provided novel unbridged metallocene precursors of the formula [RNH--SiMe.sub.2 --L].sub.2 MX.sub.2. Such Si--N--Si bridged metallocenes in combination with an organometallic compound of metals of Group IA, IIA, and IIB form a catalyst system which is highly active in the polymerization of alpha-olefins.

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