Process for preparing a catalyst for olefin polymerization

A process for preparing a supported metallocene catalyst for olefin polymerization capable of producing a polyolefin in which the formation of gels is suppressed, which comprises (1) adding a cocatalyst compound to at least one transition metal compound to activate the transition metal compound in a reactor;

• (2) adding a carrier to the reactor after step (1) and supporting the activated transition metal compound on the carrier in the reactor;
• and (3) introducing a single treatment agent which is a metallic stearate into the reactor after step (2) and treating the supported catalyst with the single treatment agent in the reactor, wherein the content of the single treatment agent is 0.01 to 5.0% by weight based on the total weight of the supported catalyst, and the transition metal compound is a mixture of a first transition metal compound comprising at least one selected from the group consisting of [indenyl(cyclopentadienyl)]zirconium dichloride, [4-methylindenyl(cyclopentadienyl)]zirconium dichloride, [indenyl(tetramethylcyclopentadienyl)]zirconium dichloride, [2-methylindenyl(tetramethylcyclopentadienyl)]zirconium dichloride, [2-methylbenzoindenyl(cyclopentadienyl)]zirconium dichloride, and [4,5-benzoindenyl(tetramethylcyclopentadienyl)]zirconium dichloride;
• and a second transition metal compound comprising at least one selected from the group consisting of rac-dimethylsilylbis(2-methyl-4-phenylindenyl)zirconium dichloride, dimethylsilyl{tetramethylcyclopentadienyl}{2-methyl-4-(4-t-butylphenyl) indenyl}zirconium dichloride, dimethylsilyl(tetramethylcyclopentadienyl)(2-methyl-4-phenylindenyl)zirconium dichloride, and dimethylsilyl(tetramethylcyclopentadienyl)(4-phenylindenyl)zirconium dichloride;
• wherein, in step (3), the single treatment agent is dissolved or suspended in an amount of 0.01 to 5.0% by weight in at least one organic solvent selected from the group consisting of hexane, pentane, toluene, benzene, dichloromethane, diethyl ether, tetrahydrofuran, acetone, and ethyl acetate, and then used to treat the supported catalyst, and wherein the metallic stearate comprises at least one selected from the group consisting of aluminum stearate, calcium stearate, zinc stearate, magnesium stearate, and sodium stearate.