Patent ID: 8889786

Claim:
A cyclopentene ring-opening polymer which has structures at the polymer chain terminal ends where the polymer chains and groups including alkoxysilyl groups are bonded through urethane bond groups and which has a weight average molecular weight of 100,000 to 1,000,000, wherein the structures of polymer chains and groups including alkoxysilyl groups bonded through urethane bond groups are structures expressed by the general formula (1): (in the general formula (1), pCP indicates a polymer chain of cyclopentene ring-opening polymer, and A l and A 2 respectively indicate a single bond or C l to C 20 bivalent hydrocarbon groups. R l indicates a C 1 to C 20 alkyl group, when there is a plurality of groups represented by R 1 , these may be the same groups or may be different groups, X indicates a group selected from a hydrogen atom, C l to C 20 alkyl group, C 6 to C 20 aryl group, C 6 to C 20 allyloxy group, and a halogen atom, when there is a plurality of groups represented by X, these may be the same groups or may be different groups, n is an integer of 1 to 3).