Non-supported heterogeneous polyolefin polymerization catalyst composition and method for preparing same

A method for preparing a non-supported heterogeneous polyolefin polymerization catalyst composition, comprising reacting an ansa-metallocene represented by the following Chemical Formula 1 with a cocatalyst represented by the following Chemical Formula 2:

• wherein, M1 is a transition metal of Group 3 to 10 of the Periodic Table (IUPAC), or of an actinide or lanthanide;
• X's, which may be the same or different, are halogen;
• A is an element of Group 14 of the Periodic Table and functions as a bridging group linking two indenyl groups;
• R1 is C1 to C20 alkyl, C2 to C20 alkenyl, C7 to C20 alkylaryl, C7 to C20 arylalkyl, or C6 to C20 aryl;
• R2 is hydrogen or C1 to C20 alkyl, C2 to C20 alkenyl, C7 to C20 alkylaryl, C7 to C20 arylalkyl, or C6 to C20 aryl;
• R3, R3′, R4, R4′, R5, R5′, R6, R6′, R7, R7′, R8, and R8′, which may be the same or different, are independently hydrogen, or C1 to C20 alkyl, C2 to C20 alkenyl, C7 to C20 alkylaryl, C7 to C20 arylalkyl, or C6 to C20 aryl;
• n is an integer of 1 to 20;
• wherein, M2 is a metal element of Group 13 of the Periodic Table;
• R9's, which may be the same or different, are independently C1 to C20 alkyl, C2 to C20 alkenyl, C7 to C20 alkylaryl, C7 to C20 arylalkyl, or C6 to C20 aryl;
• and m is an integer of 2 or larger.