Patent ID: 7008898
Filing Date: 2006-03-07
Classification: C08F

Abstract:
1. A catalyst for the polymerization of a 1-olefin of the formula R 4 CH═CH 2 , in which R 4 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 d 50 value, of less than 15 μm, obtained by dry-grinding of magnesium alkoxide powder having a mean particle size, expressed as the d 50 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.