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|1. (WO2017200026) MOLDED FOAM BODY, DAM RUBBER, COMPOSITE BODY OF DAM RUBBER AND PANEL, AND METHOD FOR INCREASING SOUND TRANSMISSION LOSS|
|Applicants:||KURARAY CO., LTD.
|Title:||MOLDED FOAM BODY, DAM RUBBER, COMPOSITE BODY OF DAM RUBBER AND PANEL, AND METHOD FOR INCREASING SOUND TRANSMISSION LOSS|
Provided are: a molded foam body that enables improvement on damping and sound insulation properties of a panel and enables achieving of weight reduction of a panel; a dam rubber; a composite body of a dam rubber and a panel, and a method for increasing sound transmission loss. The present invention relates to a molded foam body of a resin composition comprising: a block copolymer (I) which has a polymer block (A) chiefly consisting of a structural unit derived from an aromatic vinyl compound and another polymer block (B), and which conforms to JIS K7244-10 (2005), and which has a peak top temperature of tan δ of -50°C to 50°C, as measured under the conditions of 1 mm in test piece thickness, 0.1% in distortion amount, 1 Hz in frequency, -70°C to 70°C in measurement temperature, and 3°C/min in temperature increase rate, and which has a peak top molecular weight of 30,000-500,000; at least one type of an olefin polymer (II) selected from the group consisting of ethylene- propylene-diene copolymer rubbers, ethylene- vinyl acetate copolymers, and polyethylene resins; a cross-linking agent (III); and a foaming agent (IV).