| abstract |
(57) [Summary] [Structure] [A] a group IVb or lanthanide transition metal compound containing a ligand having a cyclopentadienyl skeleton, and [B] a boron atom-containing ionic compound or a boron atom. Lewis acid contained and, if necessary, A catalyst for cyclic olefin copolymerization, which comprises [C] an organoaluminum compound. [A] Group IVb or lanthanide transition metal compound containing a ligand having a cyclopentadienyl skeleton, [C] organoaluminum compound, and [D] A catalyst for cyclic olefin copolymerization, comprising a Lewis acid containing a boron atom. (I) 2 carbon atoms using the above catalyst A copolymerization method of 0 or less α-olefin and (ii) a specific cyclic olefin. [Effect] A cyclic olefin-based copolymer having high polymerization activity and a narrow molecular weight distribution can be obtained. |