| 摘要 |
A method of polymerizing one or more 1-olefins using a catalyst system incorporating a solid catalyst component is disclosed wherein the catalyst component is prepared by contacting, in the presence of an inert liquid hydrocarbon, silica, a soluble organomagnesium compound, an SiCl4 magnesium fixing agent, an alcohol, TiCl4, and a carboxylic acid derivative, followed by extraction with a TiCl4 containing extraction liquid. The inventive catalyst system allows ready control of product molecular weight by control of hydrogen concentration in the reactor, and allows the production of high MI or MF polymers at high productivities.
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