Patent ID: 7151071

Claim:
A method of preparing a solid titanium catalyst for olefin polymerization comprising the steps of: (1) preparing a magnesium compound solution by dissolving magnesium halide compound in a solvent mixture of cyclic ether and one or more alcohol; (2) preparing a carrier by adding titanium halide compound represented by the general formula (I) to said magnesium compound solution at a temperature range of −10° C. to 30° C., wherein a molar ratio of the titanium halide compound to the cyclic ether is 3.0 to 10, then elevating the temperature of the solution and aging the solution to precipitate particles, and then adding titanium halide compound thereto for further reaction: Ti(OR) a X (4-a) (I) wherein, R is an alkyl group having 1–10 carbon atoms, X is a halogen atom, and a is an integer of 0–3; (3) preparing a catalyst by reacting said carrier with titanium compound and electron donor; and (4) washing said catalyst with halogenated saturated hydrocarbon.