| 摘要 |
PURPOSE: A method for preparing a highly active catalyst for the polymerization of olefin, a catalyst prepared by the method and a method for preparing a polyolefin using the catalyst are provided, to prepare a high density, middle density or linear low density polyethylene having a wide molecular weight distribution or a bimodal molecular weight distribution. CONSTITUTION: The preparation method of the highly active catalyst comprises the steps of contacting a solid anhydride carrier with an alcohol represented by R1-OH in a nonpolar solvent; contacting the mixture with at least two kinds of alcohols represented by R2-OH and R3-OH; contacting the mixture with the titanium compound represented by Ti(OR3)lX(4-l), the vanadium compound represented by VOmX'(n-2m) or their mixture; and contacting the mixture with the vanadium compound represented by VOmX'(n-2m), the titanium compound represented by Ti(OR5)mX''(4-m), or their mixture, wherein R1 is an alkyl group of C1-C10; R2 and R3 are independent each other and are an alkyl group of C1-C10; R4 is an alkyl group of C1-C10; X, X' and X'' are independent each another and are a halogen atom; l is an integer of 1-4; m is 0 or 1; n is an integer of 2-5; and R5 is an alkyl group of C1-C10.
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