Method for preparing olefin-diene copolymer using transition metal compound containing thiophene-fused cyclopentadienyl ligand

A method for preparing an olefin-diene copolymer, comprising:

• polymerizing at least one olefin-based monomer and at least one diene-based monomer in the presence of a catalyst comprising a transition metal compound represented by the following formula 1:
• wherein M is a Group 4 transition metal;
• Q1 and Q2 are independently a halogen, C1-C20 alkyl, C2-C20 alkenyl, C2-C20 alkynyl, C6-C20 aryl, C1-C20 alkyl C6-C20 aryl, C6-C20 aryl C1-C20 alkyl, C1-C20 alkylamido, C6-C20 arylamido, or C1-C20 alkylidene;
• R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 are independently hydrogen;
• C1-C20 alkyl with or without an acetal, ketal, or ether group;
• C2-C20 alkenyl with or without an acetal, ketal, or ether group;
• C1-C20 alkyl C6-C20 aryl with or without an acetal, ketal, or ether group;
• C6-C20 aryl C1-C20 alkyl with or without an acetal, ketal, or ether group;
• or C1-C2 silyl with or without an acetal, ketal, or ether group, wherein R1 and R2 can be linked to each other to form a ring;
• R3 and R4 can be linked to each other to form a ring;
• and at least two of R5 to R10 can be linked to each other to form a ring;
• and
• R11, R12, and R13 are independently hydrogen;
• C1-C20 alkyl with or without an acetal, ketal, or ether group;
• C2-C20 alkenyl with or without an acetal, ketal, or ether group;
• C1-C20 alkyl C6-C20 aryl with or without an acetal, ketal, or ether group;
• C6-C20 aryl C1-C20 alkyl with or without an acetal, ketal, or ether group;
• C1-C20 silyl with or without an acetal, ketal, or ether group;
• C1-C20 alkoxy;
• or C6-C20 aryloxy, wherein R11 and R12, or R12 and R13 can be linked to each other to form a ring.