Abstract: Provided is a block polymer including two or more polymer block As each having a value ? of 0.20 or less and a functional group F containing at least one element selected from a group consisting of nitrogen, silicon, oxygen, and sulfur in a part or all of terminals of the two or more polymer block As, in which the block polymer has a value ? of 0.75 or more, when p, q, r and s are defined as a component proportion (molar proportion) of a structural unit represented by Formula (1), a component proportion of a structural unit represented by Formula (2), a component proportion of a structural unit represented by Formula (3), and a component proportion of a structural unit represented by Formula (4), in the polymer, respectively.

Abstract: There is provided a polymer composition using which a molded product having excellent balance between rigidity, wear resistance, viscoelastic properties, and heat resistance can be obtained. A polymer composition according to the disclosure includes (A) a conjugated diene rubber (where, a polymer corresponding to the following component (B) is excluded); and (B) a hydrogenated product of a polymer that satisfies the following (1) to (3), which is a polymer in which 80% or more of structural units derived from butadiene are hydrogenated: (1) being a copolymer of a conjugated diene compound containing butadiene and an aromatic vinyl compound, (2) including a polybutadiene block having a vinyl group content of 20% or less, and (3) including a block composed of a conjugated diene compound and an aromatic vinyl compound.

Abstract: The tape reel of the present invention includes: a cylindrical hub for winding recording tape; and a pair of upper and lower flanges respectively projecting circumferentially from upper and lower portions of the hub. The tape reel further comprises: a lower piece including the lower flange and a first cylinder wall formed integrally with the lower flange; and an upper piece including the upper flange and a second cylinder wall formed integrally with the upper flange. The hub is formed in a double cylinder form by a fit engagement between the first cylinder wall of the lower piece and the second cylinder wall of the upper piece.

Abstract: The tape reel of the present invention includes: a cylindrical hub for winding recording tape; and a pair of upper and lower flanges respectively projecting circumferentially from upper and lower portions of the hub. The tape reel further comprises: a lower piece including the lower flange and a first cylinder wall formed integrally with the lower flange; and an upper piece including the upper flange and a second cylinder wall formed integrally with the upper flange. The hub is formed in a double cylinder form by a fit engagement between the first cylinder wall of the lower piece and the second cylinder wall of the upper piece.