Method for producing cyclic olefin copolymer, cyclic olefin copolymer, crosslinked product, film, or sheet, laminate, circuit board, electronic device, and prepreg

A method for producing a cyclic olefin-based copolymer, in which the cyclic olefin-based copolymer includes (A) one or more repeating units derived from an olefin represented by General Formula (I), (B) one or more repeating units derived from a cyclic non-conjugated diene represented by General Formula (III), and (C) one or more repeating units derived from a cyclic olefin represented by General Formula (V),

• [in General Formula (I), R300 represents a hydrogen atom or a linear or branched hydrocarbon group having 1 to 29 carbon atoms]
• [in General Formula (III), u is 0 or 1, v is 0 or a positive integer, w is 0 or 1, R61 to R76, Ra1, and Rb1 may be the same as or different from each other, and are each a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, R104 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, t is a positive integer of 0 to 10, and R75 and R76 may be bonded to each other to form a monocyclic ring or a polycyclic ring]
• [in General Formula (V), u is 0 or 1, v is 0 or a positive integer, w is 0 or 1, R61 to R78, Ra1, and Rb1 may be the same as or different from each other, and are each a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms, and R75 to R78 may be bonded to each other to form a monocyclic ring or a polycyclic ring],
• a glass transition temperature of the cyclic olefin-based copolymer measured by a differential scanning calorimeter (DSC) is equal to or higher than 100° C.,
• the method includes a polymerization step of copolymerizing an olefin, a cyclic non-conjugated diene, and a cyclic olefin in a presence of a catalyst for olefin polymerization, containing a transition metal compound (A) and a compound (B), and the transition metal compound (A) contains one or two or more selected from the group consisting of a transition metal compound (A-1) represented by Formula (II) and a transition metal compound (A-2) represented by Formula (VI),
• [in Formula (II), M2 represents a transition metal atom of Group 4 of a periodic table, n1 represents an integer of 1 to 3, L's each independently represent a monovalent anionic ligand in which an atom of Group 15 of the periodic table serves as a coordinating atom, X1's each independently represent a group or atom selected from the group consisting of a hydrogen atom, a halogen atom, a hydrocarbon group, a halogen-containing group, an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group, a phosphorus-containing group, a silicon-containing group, a boron-containing group, and an aluminum-containing group, as well as the group consisting of substitution products of these groups, R5 to R9 each independently represent a group or atom selected from the group consisting of a hydrogen atom, a halogen atom, a hydrocarbon group, a halogen-containing group, an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group, a phosphorus-containing group, a silicon-containing group, a boron-containing group, and an aluminum-containing group, as well as the group consisting of substitution products of these groups, any two or three of R5 to R9 may be fused to form a ring, and the ring to be formed may have aromaticity including a conjugated double bond]
• [in Formula (VI), M3 represents a transition metal atom of Group 4 of the periodic table, n2 represents an integer of 1 to 4, X2's each independently represent an atom or group selected from the group consisting of a hydrogen atom, a halogen atom, a hydrocarbon group, a halogen-containing group, an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group, a phosphorus-containing group, a silicon-containing group, a boron-containing group, and an aluminum-containing group, as well as the group consisting of substitution products of these groups, R10 to R17 each independently represent an atom or group selected from the group consisting of a hydrogen atom, a halogen atom, a hydrocarbon group, a halogen-containing group, an oxygen-containing group, a sulfur-containing group, a nitrogen-containing group, a phosphorus-containing group, a silicon-containing group, a boron-containing group, and an aluminum-containing group, as well as the group consisting of substitution products of these groups, adjacent groups of R10 to R17 may be bonded to each other to form a ring, and the ring to be formed may have aromaticity including a conjugated double bond], and the compound (B) contains one or two or more selected from the group consisting of an organic metal compound (B-1), an organic aluminum oxy compound (B-2), and a compound (B-3) that reacts with the transition metal compound (A) to form an ion pair.