| abstract |
(57) Abstract: A crosslinkable cyclic olefin (co) polymer which imparts excellent chemical resistance and solvent resistance while maintaining high optical transparency, storage stability, and heat resistance. Its composition, And a crosslinked product thereof. SOLUTION: The composition contains at least one structural unit derived from a cyclic olefin having an oxetane skeleton, and has a polystyrene equivalent number average molecular weight of 5,000 to 1,500, A cyclic olefin-based (co) polymer having a molecular weight of 000 A cyclic olefin-based (co) polymer composition containing a polymer and a ring-opening reaction initiator for an oxetanyl group, and a crosslinked product obtained by crosslinking the (co) polymer composition. |