| 摘要 |
The catalyst of the invention is useful in preparing high density polymers of controlled molecular weight distribution. A supported alpha-olefin polymerization catalyst composition of this invention is prepared in a multi-step process. In the first step, a mixture of a solid, porous carrier having reactive -OH groups and a non-polar solvent is contacted with at least one organomagnesium compound of the formula RmMg R'n (I) where R and R' are the same or different C4-C12 alkyl groups, m and n are each 0, 1 or 2, providing that m+n equals the valence of Mg. Subsequently, the mixture of the first step is contacted with 1-butanol. The amount of 1-butanol controls the molecular weight distribution of the The mixture is then contacted with at least one transition metal compound soluble in the non-polar solvent to form a precursor which is activated with a cocatalyst selected from the group consisting of diisobutyl aluminum hydride or triethylaluminum (TEAL) (sometimes referred to as an activator, and the words activator and cocatalyst may be used interchangeably herein.
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