Crosslinkable composition and crosslinked product

A crosslinkable composition comprising:

• a liquid monocyclic olefin ring-opened polymer (A) having a reactive group at a polymer chain end thereof and a weight-average molecular weight (Mw) of 1,000 to 50,000;
• and
• a crosslinkable compound (B) having, in the molecule, two or more functional groups reactive with the reactive group at the polymer chain end of the monocyclic olefin ring-opened polymer (A), wherein
• the liquid monocylic olefin ring-opened polymer (A) is a copolymer containing a structural unit derived from cyclopentene and a structural unit derived from a monomer copolymerizable with cyclopentene as repeating structural units and having the reactive group at the polymer chain end thereof, the monomer copolymerizable with cyclopentene being a monocyclic diolefin, a polycyclic monoolefin, or a polycyclic diene,
• the liquid monocyclic olefin ring-opened polymer (A) contains, as repeating structural units, a structural unit derived from cyclopentene at a ratio of 70 mol % or more based on all repeating units,
• the reactive group at the polymer chain end of the monocyclic olefin ring-opened polymer (A) is a hydroxyl group or a hydroxycarbonyl group;
• and
• the functional group of the crosslinkable compound (B) is an isocyanate group, an epoxy group, or an amino group.