| 摘要 |
PROBLEM TO BE SOLVED: To obtain both a cyclic olefin-based (co)polymer having both excellent optical characteristics and heat resistance and an optical material formed from the (co)polymer. SOLUTION: This cyclic olefin-based (co)polymer is characterized in that the cyclic olefin-based (co)polymer contains a repeating unit (a) represented by formula (1) (R1 and R2 are each independently a hydrogen atom, a 1-8C alkyl group, a cycloalkyl-substituted alkyl group, a cycloalkyl group and at least one of R1 and R2 is a 3-8C alkyl group) and has 220-400 deg.C peak temperature of Tanδmeasured by dynamic viscoelasticity and 10,000-1,000,000 number- average molecular weight calculated as polystyrene.
|
