| abstract |
The present invention provides a cyclic olefin resin that hardly changes color even when exposed to light or heat for a long period of time. A cyclic olefin resin containing a repeating unit derived from a cyclic olefin monomer and a repeating unit derived from an acyclic olefin monomer, having a glass transition temperature of 120 ° C. or higher, The proportion of the repeating unit derived from the olefin monomer is 40 mol% or more and 60 mol% or less, the proportion of the repeating unit derived from the acyclic olefin monomer is 40 mol% or more and 60 mol% or less, and the cyclic olefin type In the dimer of the repeating unit derived from the monomer, the ratio of the meso type double chain site to the racemo type double chain site (meso type double chain site / rasemo type double chain site) is 1.0 or less. [Selection figure] None |