| abstract |
PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer composition excellent in flexibility and fluidity without impairing mechanical strength and elastic recovery, and furthermore, using this composition, a gas shielding property To provide a medical container stopper with excellent medical hygiene, injection molding and high productivity. SOLUTION: Isobutylene-isoprene copolymer rubber and / or halogenated isobutylene-isoprene copolymer rubber, olefin-based low crystalline polymer, olefin-based high crystalline polymer, and, if necessary, hydrogenated diene-based polymer A thermoplastic elastomer composition obtained by melt-mixing a softening agent for rubber and the like at a specific ratio and dynamically heat-treating the mixture in the presence of a crosslinking agent for rubber, and a medical container stopper comprising the composition. plug. |