Production method for olefin-based polymer, and olefin polymerization catalyst

A method of producing an olefin-based polymer, the method comprising polymerizing an olefin raw material by contacting components (A) to (D) in the presence of component (N) in the olefin raw material or a polymerization solvent:

• (A) a transition metal compound;
• (B) a boron compound capable of forming an ion pair with the component (A);
• (C) an organoaluminum compound represented by a formula (VIII):
• R17vAlJ3-v (VIII)
• (D) an aluminoxane represented by a formula (i) or (ii):
• (N) a nonpolymerizable unsaturated hydrocarbon;
• wherein:
• i
• R17 represents an alkyl group having 1 to 20 carbon atoms;
• J represents a hydrogen atom, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a halogen atom;
• v represents an integer of from 1 to 3, and when v represents 2 or more, R17's may be identical to or different from each other, provided that at least one R17 represents an alkyl group having 1 to 20 carbon atoms;
• Ra represents an alkyl group having 1 to 20 carbon atoms, Ra's may be identical to or different from each other;
• n represents an integer of from 1 to 50;
• the transition metal compound (A) is a double crosslinked metallocene complex represented by a formula (I):
• M represents a metal element of Groups 3 to 10 of the periodic table or the lanthanoid series;
• E1 and E2 each represent a ligand selected from a substituted cyclopentadienyl group, an indenyl group, a substituted indenyl group, a heterocyclopentadienyl group, a substituted heterocyclopentadienyl group, an amide group, a phosphide group, a hydrocarbon group, and a silicon-containing group, form a crosslinked structure via A1 and A2, and may be identical to or different from each other;
• X represents a σ-bonding ligand, and when a plurality of X's are present, the plurality of X's may be identical to or different from each other, and X may be crosslinked with any other X, E1, E2, or Y;
• Y represents a Lewis base, and when a plurality of Y's are present, the plurality of Y's may be identical to or different from each other, and Y may be crosslinked with any other Y, E1, E2, or X;
• A1 and A2 each represent a divalent crosslinking group for bonding two ligands, and each represent a hydrocarbon group having 1 to 20 carbon atoms, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, a silicon-containing group, a germanium-containing group, a tin-containing group, —O—, —CO—, —S—, —SO2—, —Se—, —NR1—, —PR1—, —P(O)R1—, —BR1—, or —AlR1—, wherein R1 represents a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, and may be identical to or different from each other;
• q represents an integer of from 1 to 5 representing [(valence of M)−2];
• and
• r represents an integer of from 0 to 3.