Patent ID: 6133189
Filing Date: 2000-10-17
Classification: C08F

Abstract:
An .alpha.-olefin polymerization catalyst which comprises:(A) a solid catalyst component containing a tetra-valent titanium obtained by treating a magnesium compound having a Mg--O bond in its molecule with a titanium halide in a solvent, separating the resulting mixture by solid-liquid separation, and washing the thus obtained solid with a halogenated hydrocarbon or an aromatic hydrocarbon at a temperature of 50 to 120.degree. C.; and thereafter washing with an aliphatic hydrocarbon, wherein the magnesium compound is a reaction product of an organomagnesium compound with an organosilicon compound having a Si--O bond, and the titanium halide is one represented by the general formula Ti(OR.sup.19).sub.a X.sub.4-a (R.sup.19 represents a hydrocarbon group having 1 to 20 carbon atoms, X represents a halogen atom and ""a"" represents a number satisfying 0.ltoreq.a.ltoreq.2);(B) an organoaluminum compound; and(C) an organosilicon compound represented by the general formula R.sup.1 R.sup.2 Si(OR.sup.3).sub.2 (wherein R.sup.1 represents a hydrocarbon group having 4 to 30 carbon atoms wherein a carbon bonded directly to Si is a tertiary carbon, R.sup.2 represents a straight chain hydrocarbon group having 2 to 20 carbon atoms and R.sup.3 represents a hydrocarbon group having 1 to 10 carbon atoms), or the general formula R.sup.4 R.sup.5 Si(OR.sup.6).sub.2 (wherein R.sup.4 and R.sup.5 are hydrocarbon groups having an alicyclic hydrocarbon having 5 carbon atoms as a basic structure, R.sup.4 and R.sup.5 may be the same or different, and R.sup.6 represents a hydrocarbon group having 1 to 10 carbon atoms).