Patent ID: 7320950

Claim:
A polymerization catalyst comprising: (A′) a transition metal compound represented by the general formula (II): wherein, M is a metal element of Groups 3 to 10 of the Period Table or lanthanoid series; X is a ligand capable of forming a σ-bond or π-bond with the proviso that when a plurality of X groups is present, these groups may be the same or different, and may be cross-linked with the other X group, one of the aromatic rings in formula (II) or Y; Y is a Lewis base with the proviso that when a plurality of Y groups is present, these groups may be the same or different, and may be cross-linked with the other Y group, one of the aromatic rings in formula (II) or X; A 1 and A 2 are divalent cross-linking groups capable of bonding the two aromatic rings in formula (II) to each other, are independently a C 1 -C 20 halogen-containing hydrocarbon group, a silicon-containing group, a germanium-containing group, a tin-containing group, —O—, —CO—, —S—, —SO 2 —, —Se—, —NR 1 —, —PR 1 —, —P(O)R 1 —, —BR 1 — or —AlR 1 —, wherein R 1 is a hydrogen atom, a halogen atom, a C 1 -C 20 hydrocarbon group or a C 1 -C 20 halogen-containing hydrocarbon group, and may be the same or different; q is an integer of 1 to 5 given by formula: [(valence of M)−2]; r is an integer of 0 to 3; R 2 through R 7 are respectively a hydrogen atom, a halogen atom, a C 1 -C 20 hydrocarbon group, a C 1 -C 20 halogen-containing hydrocarbon group, a silicon-containing group or a heteroatom-containing group with the proviso that at least one of R 2 through R 7 is not a hydrogen atom; and R 2 through R 7 may be the same or different, and adjacent groups of R 2 through R 7 may be bonded to each other to form a ring, and (B) a component selected from the group consisting of (B-1) a compound capable of forming an ionic complex by reacting with the transition metal compound (A) or a derivative thereof, (B-2) aluminoxane, and (B-3) a Lewis acid.