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Polymerization of ethylene with nickel α-diimine catalysts

✍ Scribed by Daniela Pappalardo; Mina Mazzeo; Claudio Pellecchia

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
307 KB
Volume
18
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Several nickel α‐diimine compounds of the general formula (ArNC(R)C(R)NAr)NiX~2~ (Ar = 2,6‐alkyl substituted Ph, R = H or CH~3~, X = Br or CH^3^) were tested in ethylene polymerization after activation with different co‐catalysts, such as methylaluminoxane, Al(C~2~H~5~)~2~Cl or other aluminium alkyls, and ionizing reagents like B(C~6~F~5~)~3~, [CPh~3~][B(C~6~F~5~)~4~] or HBF~4~. The performances of the different catalytic systems were compared with reference to polymer productivity and structure. The degree of branching of the obtained polyethylenes was shown to depend not only on the ligand environment at the Ni centre but also on the type of co‐catalyst.

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