Basell Polyolefine Gmbh

Paul Schöneborn

Ludwig Böhm

Frank Peter Alt

The invention relates to a method for producing a poly-1-olefin by polymerisation of a 1-olefin of the formula RCH&#x2550;CH, in which Ris hydrogen or an alkyl radical having from 1 to 10 carbon atoms, in suspension, in solution or in the gas phase, at a temperature of from 20 to 200&#xb0; C. and a pressure of from 0.5 to 50 bar, in the presence of a catalyst which consists of the product of the reaction of a magnesium alkoxide with a transition-metal compound (component a) and an organometallic compound (component b), whose component a has been produced by reacting a transition-metal compound of titanium, zirconium, vanadium or chromium with a gelatinous dispersion of the magnesium alkoxide in an inert hydrocarbon. In accordance with the invention, the gelatinous dispersion is obtained by stirring using a stirring element, or shearing using a high-performance shearing tool, a suspension of magnesium alkoxide powder having a mean particle size, expressed as the dvalue, of less than 15 &#x3bc;m, obtained by dry-grinding of commercially available magnesium alkoxide powder having a mean particle size, expressed as the dvalue, of greater than or equal to 15 &#x3bc;m, preferably in the range from 100 to 1000 &#x3bc;m, in an inertized mill, in an aliphatic hydrocarbon in which the magnesium alkoxide particles are insoluble. The invention also relates to a catalyst which is suitable for carrying out the method.

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Kriftel, Germany

Paul Schöneborn