Process for polymerizing olefin

Abstract

In a process for polymerizing an olefin in the presence of a catalyst system combining an organoaluminum compound with a hydrocarbon insoluble solid catalytic component prepared by treating a hydrocarbon solution containing a magnesium compound, a titanium compound and a zirconium compound with an aluminum halide having the formula AlR.sup.1 X.sub.2.sup.1 (R.sup.1 represents an alkyl, aryl or cycloalkyl group and X.sup.1 represents a halogen atom), an improvement characterized in that the magnesium compound is a compound having the formula Mg(OR.sup.2).sub.l X.sub.2-l.sup.2 (R.sup.2 represents an alkyl, aryl or cycloalkyl group; X.sup.2 represents a halogen atom; and l is 1 or 2) and the titanium compound is a compound having the formula Ti(OR.sup.3).sub.n X.sub.4-n.sup.3 (R.sup.3 represents an alkyl, aryl or cycloalkyl group; X.sup.3 represents a halogen atom; n is 1, 2 or 3) and the zirconium compound is a compound having the formula Zr(OR.sup.4).sub.m X.sub.4-m.sup.4 (R.sup.4 represents an alkyl, aryl or cycloalkyl group; X.sup.4 represents a halogen atom; m is 1, 2 or 3) or an alcohol solution of a compound having the formula ZrX.sub.4.sup.4 (X.sup.4 is defined above).

Dependencies are inferred from the claim text.