Solid catalyst component for olefin polymerization

Claim 1

A process for the preparation of a solid catalyst component for use in the polymerization of 1-olefins, which component is composed of a titanium halide deposited on an essentially anhydrous magnesium halide support, said process comprising the steps, carried out in an inert atmosphere, of (1) contacting a hydrocarbon solution of a magnesium salt of an aliphatic carboxylic acid containing at least six carbon atoms with a hydrocarbon solution of a C 2 -C 20 alkylaluminum dichloride, the amount of said dichloride relative to said salt being sufficient to provide a mole ratio of Al:Mg of at least 2:1, said solutions being contacted with each other at a temperature of from about 10° C. to about 100° C., thereby forming a hydrocarbon suspension of magnesium chloride particles, (2) isolating said particles from said suspension, (3) successively washing said particles with a hydrocarbon solvent until the particles are substantially free of chloride and unadsorbed aluminum compounds, (4) contacting the washed particles with an electron donor, (5) washing the donor-treated particles with a hydrocarbon solvent, and (6) contacting the washed particles with a titanium halide, thereby effecting deposition of said titanium halide on the magnesium chloride particles, said hydrocarbon solvent being any liquid hydrocarbon or mixtures thereof, and said electron donor being selected from the group consisting of C 4 -C 24 aliphatic ethers, C 3 -C 4 cyclic ethers, C 7 -C 15 aromatic ethers, C 4 -C 24 alkyl esters of fatty acids, C 8 -C 24 alkyl esters of aromatic acids, C 1 -C 12 aliphatic amines, C 4 -C 6 cyclic amines, C 6 -C 10 aromatic amines, C 1 -C 18 aliphatic alcohols, C 7 -C 15 aromatic alcohols, C 6 -C 10 phenols, C 6 -C 18 aliphatic or aromatic phosphines and C 6 -C 12 aliphatic sulfides.