Several nickel alpha-diimine compounds of the general formula (ArN=C(R)-C(R)=NAr)NiX2 (Ar = 2,6-alkyl substituted Ph, R = H or CH3, X = Br or CH3) were tested in ethylene polymerization after activation with different co-catalysts, such as methylaluminoxane, Al(C2H5)(2)Cl or other aluminium alkyls, and ionizing reagents like B(C6F5)(3), [CPh3][B(C6F5)(4)] or HBF4. 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.
Polymerization of ethylene with nickel alpha-diimine catalysts
MAZZEO, Mina;PELLECCHIA, Claudio
1997-01-01
Abstract
Several nickel alpha-diimine compounds of the general formula (ArN=C(R)-C(R)=NAr)NiX2 (Ar = 2,6-alkyl substituted Ph, R = H or CH3, X = Br or CH3) were tested in ethylene polymerization after activation with different co-catalysts, such as methylaluminoxane, Al(C2H5)(2)Cl or other aluminium alkyls, and ionizing reagents like B(C6F5)(3), [CPh3][B(C6F5)(4)] or HBF4. 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
