| 摘要 |
The invention relates to unsupported or supported catalyst compositions for alpha-olefin (ethylene and/or propylene) polymerization which comprises(1) a metallocene compound,(2) an inorganic aluminum compound Al(OH)xOy, wherein x is a number from 0 to 3, wherein x+2 y=3,(3) trimethylaluminum,wherein Al(OH)xOy is used in an amount sufficient to provide an Al(OH)xOy:metallocene molar ratio of 5 to 10,000,wherein trimethylaluminum is used in an amount sufficient to provide a trimethylaluminum:metallocene molar ratio of 50 to 10,000, andwherein the two aluminum compounds, (2) and (3), are used in amounts to provide a molar ratio of trimethylaluminum to Al(OH)xOy in the range of from 0.1 to 100.
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