Patent ID: 6114271
Filing Date: 2000-09-05
Classification: B01J,C08F,Y10S

Abstract:
A process for the preparation of a catalyst component for the polymerization or copolymerization of ethylene to give an ultrahigh-molecular-weight ethylene polymer in suspension or in the gas phase, which consists essentially of(A) reacting a magnesium compound of the formula IR.sup.1 --Mg--R.sup.2 (I)in which R.sup.1 and R.sup.2 are identical or different and are a C.sub.1 -C.sub.20 -alkyl radical, a C.sub.5 -C.sub.20 -cycloalkyl radical, a C.sub.6 -C.sub.20 -aryl radical or a C.sub.2 -C.sub.20 -alkenyl radical, in an inert hydrocarbon at a temperature of from 0 to 100.degree. C. witha halogenating agent of the formula IIR.sup.3 --X, (II)in which X is a halogen atom and R.sup.3 is a C.sub.1 -C.sub.20 -alkyl radical, a C.sub.5 -C.sub.20 -cycloalkyl radical, a C.sub.6 -C.sub.20 -aryl radical or a C.sub.2 -C.sub.20 -alkenyl radical, to givea solid product of the formula III(R.sup.1, R.sup.2, R.sup.3).sub.n --Mg--X.sub.2-n (III),in which R.sup.1, R.sup.2 and R.sup.3 are as defined above, and 0.5.ltoreq.n.ltoreq.1.5, and(B) reacting the solid product of the formula III with a hydrocarbon-soluble titanium compound of the formula IVZ.sub.m --Ti--Y.sub.4-m (IV),in which Z and Y are identical or different and are a halogen atom, a C.sub.1 -C.sub.6 -alkoxy group or a C.sub.1 -C.sub.20 -carboxyl radical, and m is a number from 0 to 4, together with a perhalogen compound of the formula VX.sub.p --C--Q.sub.4-p (V),in which X is a halogen atom, Q is a halogen atom or a hydrogen atom and p is 3 or 4, in a Ti:Mg molar ratio of from 0.01 to 1 and in a Ti:perhalogen compound ratio of from 0.1 to 1, wherein an electron-donor compound is diisobutyl phthalate, which is present in one of reaction steps (A) and (B) in an amount of from 0.01 to 1 mol per mol of magnesium compound, and and the resultant solid is subsequently comminuted to a mean particle size of from 0.5 to 5.mu.m.