| 摘要 |
High activity, stereoregular olefin polymerization catalysts are produced from an organoaluminum cocatalyst, a selectivity control agent and a procatalyst obtainable from a magnesium-containing, titanium-containing procatalyst precursor also containing at least one of alkoxide, optionally substituted phenoxide or trialkylborate moieties. The catalysts are useful in the polymerization or copolymerization of lower .alpha.-olefins, particularly propylene.
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