Fluorine-containing cyclic olefin (co)polymer and method for producing same

A method for producing a fluorine-containing cyclic olefin (co)polymer, the method comprising:

• an addition step of adding, at least, monomers including a monomer represented by general formula (2) shown below and an α-olefin having 2 to 10 carbon atoms, a catalyst, and a solvent to a polymerization vessel, and
• a polymerization step of polymerizing the monomers in the polymerization vessel in presence of the catalyst, wherein
• in the addition step, an amount added of the monomer represented by general formula (2) exceeds 40 mol %, an amount added of the α-olefin having 2 to 10 carbon atoms is at least 0 mol % but less than 60 mol %, and the monomer represented by general formula (2) is also used as a solvent, wherein an amount added of the monomer represented by general formula (2) exceeds 50% by mass of the solvent:
• wherein in general formula (2), R1 to R12 each represent, independently, a hydrogen atom, a halogen atom, a hydrocarbon group, a substituted or unsubstituted alkyl group, an alkyl group having a fluorine atom, an alkoxy group having a fluorine atom, an ether linkage-containing alkyl group having a fluorine atom, or a substituent represented by —COOR13 or —OCOR13, provided that at least one fluorine atom is included within R1 to R12, and R9 or R10, and R11 or R12 may be bonded together to form a ring,
• R13 represents a substituted or unsubstituted alkyl group, or an alkyl group having a fluorine atom, and
• furthermore, m represents 0 or a positive integer, and when m is 2 or greater, each of R5 to R8 in repeating units may be identical or different, and when m=0, at least one of R1 to R4 and R9 to R12 is not a hydrogen atom.