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AssigneeBasell Polyolefine GmbH
InventorsFrank Alt, Paul Schöneborn, Ludwig Böhm
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The invention relates to a method for producing a poly-1-olefin by polymerisation of a 1-olefin of the formula R4CH═CH2, in which R4 is 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° 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 d50 value, of less than 15 μm, obtained by dry-grinding of commercially available magnesium alkoxide powder having a mean particle size, expressed as the d50 value, of greater than or equal to 15 μm, preferably in the range from 100 to 1000 μm, 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.
A catalyst for the polymerization of a 1-olefin of the formula R4CH═CH2, in which R4 is hydrogen or an alkyl radical having from 1 to 10 carbon atoms, which contains the reaction product of a magnesium alkoxide with a transition-metal compound (component a) and an organometallic compound (component b), wherein said 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, and said gelatinous dispersion of the magnesium alkoxide is obtained by stirring using a stirring element, or shearing using a high-performance shearing tool, a suspension of a magnesium alkoxide powder having a mean particle size, expressed as the d50 value, of less than 15 μm, obtained by dry-grinding of magnesium alkoxide powder having a mean particle size, expressed as the d50 value, of greater than or equal to 15 μm, in an inertized mill, in an inert hydrocarbon in which the magnesium alkoxide particles are insoluble.
A method for producing a poly-1-olefin which comprises polymerizing a 1-olefin of the formula R4CH═CH2, in which R4 is hydrogen or an alkyl radical having from 1 to 10 carbon atoms, in suspension, in solution or in the gas phase, at a temperature in the range from 20 to 200° C. and a pressure in the range of 0.5 to 50 bar, in the presence of a catalyst and said catalyst is the reaction product 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, and said gelatinous dispersion of the magnesium alkoxide is obtained by stirring using a stirring element, or shearing using a high-performance shearing tool, of a suspension a of a magnesium alkoxide powder having a mean particle size, expressed as the d50 value, of less than 15 μm, obtained by dry-grinding of the magnesium alkoxide powder having a mean particle size, expressed as the d50 value, of greater than or equal to 15 μm, in an inertized mill, in an inert hydrocarbon in which the magnesium alkoxide particles are insoluble.
Dependencies are inferred from the claim text.