Patent ID: 7863214

Claim:
A metal catalyst complex for preparing a cyclic olefin-based polymer by addition polymerization of a cyclic olefin-based monomer, which is represented by Formula 1 below: [M(L 1 ) x (Lâ€² 2 ) y (L 3 ) z ] a [Ani] b <Formula 1> wherein M is a Group X metal, [M(L 1 ) x (Lâ€² 2 ) y (L 3 ) z ] is a cationic complex, L 1 is an anionic hydrocarbyl-containing ligand, Lâ€² 2 is a neutral ligand, L 3 is an N-heterocyclic carbene ligand, [Ani] is BF 4 â€”, x is 1 or 2; y is 0 to 4; z is 1 or 2; 2â‰¦x+y+zâ‰¦6, a and b are respectively the number of cations and the number of anions capable of weakly coordinating with the metal M and are each a number of 1-10 which is used to satisfy the net charge balance of the metal catalyst complex, wherein for each of L 1 , Lâ€² 2 , and L 3 , when a plurality of ligands are present in a molecule of the metal catalyst complex, the ligands may be the same or different.