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MgCl 2 /R′ n Al(OR) 3− n : An Excellent Activator/Support for Transition‐Metal Complexes for Olefin Polymerization
Author(s) -
Nakayama Yasushi,
Saito Junji,
Bando Hideki,
Fujita Terunori
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600355
Subject(s) - methylaluminoxane , catalysis , transition metal , olefin fiber , polymerization , comonomer , chemistry , olefin polymerization , polymer chemistry , polymer , metallocene , metal , materials science , organic chemistry
A new and effective method for the activation, and simultaneously, immobilization of bis(phenoxyimine) early‐transition‐metal complexes for olefin polymerization (known as FI catalysts), which makes use of MgCl 2 /R′ n Al(OR) 3− n as an activator/support, has been developed. Ti‐, Zr‐, and V‐FI catalysts combined with this MgCl 2 ‐based compound can form highly active MgCl 2 ‐supported single‐site catalysts capable of demonstrating superior catalytic properties, compared to the corresponding homogeneous methylaluminoxane‐ (Ti‐ and Zr‐FI catalysts) or alkylaluminum‐activation systems (V‐FI catalysts), in terms of their catalytic activity, molecular weight, stereoselectivity, and comonomer incorporation. Additionally, these new catalysts can produce polymers of significant morphology with high efficiency. Notably, the MgCl 2 ‐based compounds can also effectively activate and immobilize the early‐to‐late transition‐metal complexes that have emerged recently. Thus, the application of MgCl 2 ‐based compounds as activators/supports for transition‐metal complexes for olefin polymerization provides a conceptually new strategy for the development of methylaluminoxane‐ and borate‐free, high‐performance, single‐site catalysts capable of controlling polymer morphology.