Molded foam body, dam rubber, composite body of dam rubber and panel, and method for increasing sound transmission loss

A complex, comprising:

• a dam rubber comprising a foam molded body;
• and
• a panel,
• wherein the foam molded body comprises:
• a block copolymer (I) having a polymer block (A) composed mainly of a structural unit derived from an aromatic vinyl compound and other polymer block (B), exhibits a peak top temperature of tan δ as measured under a condition of a thickness of a test piece of 1 mm, a strain amount of 0.1%, a frequency of 1 Hz, a measurement temperature of −70 to 70° C., and a temperature rise rate of 3° C./min in conformity with JIS K7244-10 (2005), of −50 to 50° C., and has a peak top molecular weight, as determined in terms of standard polystyrene by gel permeation chromatography, of 30,000 to 500,000,
• at least one olefin-based polymer (II) selected from the group consisting of an ethylene-propylene-diene copolymer rubber, an ethylene-vinyl acetate copolymer, and a polyethylene-based resin,
• a crosslinking agent (III), and
• a foaming agent (IV).

A method for increasing a sound transmission loss comprising:

• installing a foam molded body in a panel, wherein the foam molded body is molded from a resin composition comprising:
• a block copolymer (I) consisting of at least one polymer block (A) consisting of a structural unit derived from an aromatic vinyl compound and at least one polymer block (B) consisting of a structural unit derived from at least one selected from the group consisting of isobutylene, butadiene, and a mixture of isoprene and butadiene, wherein a hydrogenation rate of the carbon-carbon double bond in a total of the polymer block (B) is from 0 mol% to 3 mol% or 70 mol% or more, and wherein the block copolymer (I) exhibits a peak top temperature of tan δ, as measured under a condition of a thickness of a test piece of 1 mm, a strain amount of 0.1%, a frequency of 1 Hz, a measurement temperature of −70 to 70° C., and a temperature rise rate of 3° C/min in conformity with JIS K7244-10 (2005), of −50 to 50° C., and has a peak top molecular weight, as determined in terms of standard polystyrene by gel permeation chromatography, of 30,000 to 500,000,
• at least one olefin-based polymer (II) selected from the group consisting of an ethylene-propylene-diene copolymer rubber, an ethylene-vinyl acetate copolymer, and a polyethylene-based resin,
• a crosslinking agent (III), and
• a foaming agent (IV).