Patent ID: 6034188
Filing Date: 2000-03-07
Classification: C08F

Abstract:
In a process of preparing a polyolefin by polymerizing ethylene or ethylene and an .alpha.-olefin having 3 to 12 carbon atoms in the presence of a catalyst comprising a solid catalyst component and an organometallic compound, said solid catalyst component being prepared by the reaction of the following components I and II:I a reaction product obtained by reacting the following components (1),(2) and (3) with one another in the presence of a compound represented by the general formula R.sup.2 OH where R.sup.2 is a hydrocarbon group having 1 to 20 carbon atoms:(1) a silicon oxide and/or aluminum oxide(2) a reaction product obtained by the reaction of a magnesium halide and a compound represented by the general formula Me(OR).sub.n X.sub.z-n where Me represents an element of Groups I to IV in the Periodic Table, z represents the valence of the element Me, n is 0<n.ltoreq.z, X is a halogen atom and R is a hydrocarbon group having 1 to 20 carbon atoms, and(3) a titanium compound represented by the general formula Ti(OR.sup.1).sub.m X.sub.4-m ; where R.sup.1 is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom and m is 0.ltoreq.m.ltoreq.4;II an organoaluminum compound represented by the general formula Al(OR.sup.3).sub.p R.sup.4.sub.q X.sub.3-(p+q) where R.sup.3 and R.sup.4, which may be the same or different, are each independently a hydrocarbon group having 1 to 24 carbon atoms, X is a halogen atom or a hydrogen atom, p and q are 0.ltoreq.p<3 and 0.ltoreq.q.ltoreq.3, respectively, provided 0<p+q.ltoreq.3,the improvement comprising reactingIII a silicon compound having at least one Si--N--C bond with the reaction product obtained by reacting components I and II to form the solid catalyst component.