Patent ID: 7759272

Claim:
A method of preparing a catalyst for ethylene polymerization or copolymerization, characterized by comprising the following steps: (1) preparing a magnesium compound solution by contact-reacting a halogenated magnesium compound with a mixed solvent of cyclic ether and at least one alcohol; (2) reacting the resulted magnesium compound solution from the above step (1) with a silicon compound having at least one alkoxyl group; (3) preparing a support by adding a titanium compound represented by a general formula (I) to the resulted product from the step (2): Ti(OR) a X (4-a) (I) wherein R is an alkyl group having C 1-10 ; X is a halogen atom; and a is an integer of 0-4; and (4) reacting the obtained support with a titanium compound and a monoester compound represented by a general formula of R 1 COOR 2 , wherein R 1 and R 2 are independently an alkyl or aromatic group having C 1-25 , resulting in a catalyst.