| 摘要 |
<p>A catalytic titanium component for the polymerization of alkenes-1 particularly propylene contains a halogenated titanium compound, an electron donor, and a mixture of a magnesium halide and an aluminium halide, characterized in that the titanium component contains 0.1 - 10% by wt. of titanium and the titanium : magnesium : aluminium weight ratio amounts to 1 : (0.5-20): (0.05-2.5), while the magnesium : aluminium weight ratio is at least 3 : 1. With such very specific weight ratios, the aluminium halide does not act as an inert filler, but has a very special action, reflected in a particular high activity and good stereospecificity of a catalyst system containing such a titanium component. The carrier is prepared by grinding the magnesium halide and aluminium halide in the absence of the electron donor.</p> |
