| 摘要 |
Provided is a container stopper containing a foam-molded article having an expansion ratio of from 1.1 to 2.5 times, the foamed article being obtained by foaming a mixture containing: a thermoplastic elastomer composition containing 100 parts by mass of (a) a hydrogenated block copolymer that is a hydrogenated product of a block copolymer containing (A) a polymer block containing a structural unit derived from an aromatic vinyl compound and (B) a polymer block containing a structural unit derived from isoprene or a mixture of isoprene and butadiene, having a total content of a 3,4-bond unit and a 1,2-bond unit of 45% or more, has a peak top molecular weight (Mp) obtained by gel permeation chromatograph in terms of polystyrene standard of from 250,000 to 500,000, and is in a form of powder having a bulk density of from 0.10 to 0.40 g/mL, from 5 to 150 parts by mass of (b) a softening agent, and from 5 to 150 parts by mass of (c) a polyolefin resin; and (d) a foaming agent added in an amount of from 0.1 to 3% by mass based on a total mass of the thermoplastic elastomer composition.
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