Mixed metallocene catalyst composition and method for preparing polyolefin using the same

A mixed metallocene catalyst composition, comprising:

• a first metallocene catalyst including a compound of the following Formula 1;
• and
• a second metallocene catalyst including one or more selected from the group consisting of compounds of the following Formulae 2 to 4:
• wherein R1 and R2 are the same as or different from each other, and are each independently hydrogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, a silyl, an alkylaryl having 7 to 20 carbon atoms, an arylalkyl having 7 to 20 carbon atoms, or a metalloid of a Group 4 metal substituted with a hydrocarbyl;
• R1 and R2 or two R2s may be connected to each other by an alkylidene containing an alkyl having 1 to 20 carbon atoms or an aryl having 6 to 20 carbon atoms to form a ring;
• R3, R3′, and R3″ are the same as or different from each other, and are each independently hydrogen, a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, an alkylaryl having 7 to 20 carbon atoms, an arylalkyl having 7 to 20 carbon atoms, an alkoxy having 1 to 20 carbon atoms, an aryloxy having 6 to 20 carbon atoms, or a substituted or unsubstituted amino group;
• two or more of R3, R3′, and R3″ may be connected to each other to form an aliphatic or aromatic ring;
• CY1 is a substituted or unsubstituted aliphatic or aromatic ring, in which CY1 is substituted with a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, an alkylaryl having 7 to 20 carbon atoms, an arylalkyl having 7 to 20 carbon atoms, an alkoxy having 1 to 20 carbon atoms, an aryloxy having 6 to 20 carbon atoms, or a substituted or unsubstituted amino group;
• and if CY1 is substituted with multiple substituents, two or more of the substituents may be connected to each other to form an aliphatic or aromatic ring;
• M is a Group 4 transition metal;
• Q1 and Q2 are the same as or different from each other, and are each independently a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, an alkylaryl having 7 to 20 carbon atoms, an arylalkyl having 7 to 20 carbon atoms, a substituted or unsubstituted amino group, or an alkylidene having 1 to 20 carbon atoms,
• (CpR4)n(Cp′R5)M2(Q3)3-n [Formula 2]
• wherein M2 is a Group 4 transition metal;
• Cp and Cp′ are the same as or different from each other, and are each independently any one functional group selected from the group consisting of cyclopentadienyl, indenyl, 4,5,6,7-tetrahydro-1-indenyl, and fluorenyl, and they may be substituted with a hydrocarbon having 1 to 20 carbon atoms;
• R4 and R5 are the same as or different from each other, and are each independently hydrogen, an alkyl having 1 to 20 carbon atoms, an alkoxy having 1 to 10 carbon atoms, an aryl having 6 to 20 carbon atoms, an aryloxy having 6 to 10 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an alkylaryl having 7 to 40 carbon atoms, an arylalkyl having 7 to 40 carbon atoms, an arylalkenyl having 8 to 40 carbon atoms, or an alkynyl having 2 to 10 carbon atoms;
• Q3 is a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 10 carbon atoms, an alkylaryl having 7 to 40 carbon atoms, an arylalkyl having 7 to 40 carbon atoms, an aryl having 6 to 20 carbon atoms, a substituted or unsubstituted alkylidene having 1 to 20 carbon atoms, a substituted or unsubstituted amino group, an alkylalkoxy having 2 to 20 carbon atoms, or an arylalkoxy having 7 to 40 carbon atoms;
• and n is 1 or 0,
• wherein M3 is a Group 4 transition metal;
• R5 and R6 are the same as or different from each other, and are each independently hydrogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, an alkylaryl having 7 to 40 carbon atoms, an arylalkyl having 7 to 40 carbon atoms, a silyl, a methoxymethyl, a t-butoxymethyl, a tetrahydropyranyl, a tetrahydrofuranyl, a 1-ethoxyethyl, a 1-methyl-1-methoxyethyl, or a t-butyl;
• A is any one selected from the group consisting of an alkylene having 2 to 4 carbon atoms, an alkyl silicon or germanium having 1 to 4 carbon atoms, and an alkyl phosphine or an amine having 1 to 4 carbon atoms;
• Q4 and Q5 are the same as or different from each other, and are each independently a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 10 carbon atoms, an alkylaryl having 7 to 40 carbon atoms, an arylalkyl having 7 to 40 carbon atoms, an aryl having 6 to 20 carbon atoms, a substituted or unsubstituted alkylidene having 1 to 20 carbon atoms, a substituted or unsubstituted amino group, an alkylalkoxy having 2 to 20 carbon atoms, or an arylalkoxy having 7 to 40 carbon atoms, and
• m is an integer of 0 to 10,
• wherein M4 is a Group 4 transition metal;
• R7 and R8 are the same as or different from each other, and are each independently an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, a cycloalkyl having 3 to 30 carbon atoms, an aryl having 6 to 30 carbon atoms, an alkylaryl having 7 to 30 carbon atoms, an arylalkyl having 7 to 30 carbon atoms, or an arylalkenyl having 8 to 30 carbon atoms;
• Q6 and Q7 are the same as or different from each other, and are each independently a halogen, an alkyl having 1 to 20 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an aryl having 6 to 30 carbon atoms, an alkylaryl having 7 to 30 carbon atoms, or an arylalkyl having 7 to 30 carbon atoms, and Q6 and Q7 may be connected to each other to form a hydrocarbon ring having 1 to 20 carbon atoms;
• B is an alkylene having 1 to 4 carbon atoms, a dialkyl silicon, germanium, an alkyl phosphine, or an amine, and acts as a bridge between two cyclopentadienyl ligands by a covalent bond;
• a and a′ are the same as or different from each other, and are each independently a positive integer of 0 or more;
• o is an integer of 0 to 2 and p is an integer of 0 to 3;
• Y is a hetero atom of oxygen (O), sulfur (S), nitrogen (N), or phosphorus (P);
• C is hydrogen or alkyl having 1 to 10 carbon atoms.