Patent ID: 6046126
Filing Date: 2000-04-04
Classification: B01J,C08F

Abstract:
A process conducted in a hydrocarbon solvent at a temperature from 0.degree. C. to 100.degree. C. for preparing a catalyst for the gas phase polymerization of alpha olefins comprising:a. contacting a dehydrated silica support comprising from 0.1 to 3.0 weight % an aluminum compound of the formula Al.sup.1 (R.sup.1).sub.a X.sub.b wherein each R.sup.1 is independently selected from the group consisting of C.sub.1-6 alkyl radicals, X is selected from the group consisting of Cl and Br, a and b are 0 or an integer from 1 to 3 provided the sum of a+b=3; withb. a titanium compound of the formula Ti(R.sup.5).sub.y (Cl).sub.z wherein each R.sup.5 is selected from the group consisting of C.sub.2-6 alkyl and alkoxide radicals and phenyl and benzyl radicals, y and z are 0 or an integer from 1 to 4 provided that the sum of y+z=4 to provide from 0.25 to 1.0 weight % of Ti based on the silica; withc. a mixture of an aluminum compound of the formula Al.sup.2 (R.sup.2).sub.n X.sub.m wherein each R.sup.2 is independently selected from the group consisting of C.sub.1-6 alkyl radicals, X is selected from the group consisting of Cl and Br, m and n are 0 or an integer from 1 to 3 provided the sum of n+m=3, and Mg(R.sup.3).sub.2 wherein each R.sup.3 is independently selected from the group consisting of C.sub.1-6 alkyl radicals wherein the weight ratio of Mg:Al.sup.2 in said mixture is from 0.5:1 to 16:1 to provide from 0.5 to 4.0 weight % of Mg based on the weight of the silica and a ratio of Al.sup.1 +Al.sup.2 to Mg from 0.4:1 to 3:1, on the resulting product; and contacting the resulting product; withd. a secondary or tertiary alkyl halide of the formula R.sup.4 Cl wherein R.sup.4 is selected from the group consisting of C.sub.3-6 alkyl radicals to provide a weight ratio of Cl:Mg from 1.5:1 to 6:1 in the resulting product; ande. optionally contacting the resulting product with from 0 up to 0.3 mmol of an electron donor per gram of silica.