High-molecular-weight Polyethylene Prepared with Early Transition Metal Catalysts

摘要

Early transition metal catalysts [N,N]MCln, in which [N,N] is N-(2,6-diisopropylphenyl) pyridine-2-carboxaldimine (C18H22N2, NN-1), N-(2,6-diisopropylphenyl)-6-methylpyridine-2- carboxaldimine (C19H24N2, NN-2), N-(2,4,6-trimethylphenyl)pyridine-2-carboxaldimine (C15H16N2, NN-3), M is Ti, Zr and V, and n is 3 or 4, e.g. [NN-1]TiCl4 1a, [NN-1]ZrCl4 1b, [NN-1]VCl3 1c, [NN-2]TiCl4 2a, [NN-2]ZrCl4 2b, [NN-2]VCl3 2c, [NN-3]TiCl4 3a have been investigated to catalyze ethylene polymerization in the presence of methylaluminoxane (MAO). It was note- worthy that polyethylene characteristic of high molecular weight and wide or bimodal molecular weight distribution was formed with moderate to high activities.