Patent ID: 7056999

Claim:
A ring-opened cycloolefin copolymer which is a ring-opened cycloolefin copolymer or hydrogenated ring-opened cycloolefin copolymer comprising a structural unit (A) represented by the following general formula (1-1), the following general formula (1-2) or the following general formula (1-3) and a structural unit (B) represented by the following general formula (2) in a proportion of 10:90 to 70:30 in terms of a molar ratio, wherein a monomer for obtaining the structural unit (A) contains an endo form in a proportion of at least 80 mol % and the copolymer has a glass transition temperature of 120 to 250° C.: wherein in the general formulae (1-1) to (1-3), R 1 to R 13 independently represent a group selected from a hydrogen atom, halogen atoms, and alkyl groups and halogenated alkyl groups having 1 to 4 carbon atoms, and X 1 to X 3 mean individually an ethylene group or vinylene group; and wherein in the general formula (2), m is 1 or 2, X 4 means an ethylene group or vinylene group, and R 14 to R 17 independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, an aryl group, an alkenyl group, a halogenated hydrocarbon group, an alkylene group formed by bonding R 14 or R 15 to R 16 or R 17 , a group represented by —(CH 2 ) k Z or a group formed by bonding R 14 or R 15 to R 16 or R 17 and represented by —(CH 2 ) k —C(O)O—, with the proviso that at least one of R 14 to R 17 is a group represented by —(CH 2 ) k Z or a group represented by —(CH 2 ) k —C(O)O—, in which k is an integer of 0 to 3, Z is a group represented by —C(O)O—R 18 or —OC(O)—R 19 , and R 18 and R 19 represent individually a hydrocarbon group or halogenated hydrocarbon group having 1 to 10 carbon atoms.