POLYMER COMPOSITION, CROSSLINKED POLYMER, AND TIRE

Provided is a polymer composition having satisfactory processability and suitable for producing tires having a highly excellent balance among low loss characteristics, wet gripping, and ozone resistance. This polymer composition comprises: (A) a conjugated diene-based polymer which is either a polymer of a conjugated diene compound or a copolymer of a conjugated-diene compound and an aromatic vinyl compound, the conjugated diene-based polymer being a reaction product between an active polymerization terminal and a compound represented by any of general formulas (1) to (4); and (B) a halogenated butyl elastomer.