| 摘要 |
The invention relates to the preparation of polymers of propene by means of a Ziegler-Natta catalyst system comprising (1) a titanium component containing titanium, magnesium, chlorine and a benzenecarboxylic acid derivative on an inorganic oxidic support, (2) an aluminium component and (3) a silane component, characterised in that a titanium component (1) is used which is obtained by (1.1) first preparing a solid-phase precursor from (I) magnesium chloride, (II) an alkanol, (III) the support, (IV) titanium tetrachloride and (V) a phthalic acid derivative in such a way that (1.1.1) first (I) is reacted with (II), (1.1.2) subsequently the support (III) is introduced into the product from (1.1.1), (1.1.3) the solid-phase product from (1.1.2) is then reacted with (IV) in a liquid hydrocarbon, with the proviso that (V) is also introduced during (1.1.1) or (1.1.2) or (1.1.3), then (1.2) the solid-phase product from (1.1) is extracted with titanium tetrachloride, and finally the solid-phase product from (1.2) is extracted with a liquid hydrocarbon.
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