| 摘要 |
Disclosed herein are a ring-opened cycloolefin copolymer excellent in optical properties such as transparency, low in water (moisture) absorption property, high in affinity for other materials, good in post processing properties such as adhesive property and printability, and excellent in heat resistance and mechanical strength, a production process thereof, and an optical material. <??>The ring-opened cycloolefin copolymer of the invention contains a structural unit (A) represented by any one of general formulae (1-1) to (1-3) and a structural unit (B) derived from a specific cycloolefin having an ester group in a proportion of 10:90 to 50:50 in terms of a molar ratio, wherein a monomer for obtaining the structural unit (A) is a tricyclomonoolefin compound containing an endo form in a proportion of at least 80 mol% and has a glass transition temperature of 120 to 250 DEG C: <CHEM> wherein in the general formulae (1-1) to (1-3), R<1> to R<13> individually 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.
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