Catalysts for the polymerization of olefins

Abstract

Solid catalyst components produced by reacting an organomagnesium compound with an alkoxy compound of the formula, R.sup.1.sub.a Al(OR.sup.2).sub.b X.sub.c wherein R.sup.1 and R.sup.2 are each a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom and a, b and c are numbers satisfying the equations at the same time, 0.ltoreq.a<3, 0<b.ltoreq.3, 0.ltoreq.c<3, and a+b+c=3 and/or of the formula, R.sup.3.sub.d P(OR.sup.4).sub.e X.sub.f wherein R.sup.3 and R.sup.4 are each a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom, and d, e and f are numbers satisfying the equations at the same time, 0.ltoreq.d<3, 0<e.ltoreq.3, 0.ltoreq.f<3, and d+e+f=3 to produce a solid product, and allowing the solid product to support a titanium compound and/or a vanadium compound, and a method for producing polyolefins which comprises polymerizing olefin in the presence of a catalyst system comprising said solid catalyst component and an organoaluminum compound.

Dependencies are inferred from the claim text.