VISCOELASTIC COMPOSITION FOR INTERIOR FINISHING SUBSTRATE MATERIAL AND INTERIOR FINISHING SUBSTRATE MATERIAL USING THE SAME, FLOOR IMPACT SOUND REDUCTION LAMINATED BOARD, FLOOR IMPACT SOUND REDUCTION STRUCTURE

To provide a viscoelastic composition for an interior finishing substrate material that is a viscoelastic composition for an interior finishing substrate material used for an interior finishing substrate material in a construction such as a dwelling house and enables propagation of high-frequency band sound to be suppressed even when the viscoelastic composition is not formed to be a porous layer, and to provide an interior finishing substrate material, a floor impact sound reduction laminated board and a floor impact sound reduction structure each using the viscoelastic composition.SOLUTION: A viscoelastic composition for an interior finishing substrate material 1 is provided which is composed of viscoelastic composition. The viscoelastic composition is used for forming a damping layer 2 sandwiched between two plate materials 3 and 3' in the interior finishing substrate material 1 comprised of the two plate materials 3, 3 'and the damping layer 2, the viscoelastic composition contains a polymer emulsion as a main component and a thickener, wherein the viscosity of the viscoelastic composition at 0.5 rpm measured by an E type viscometer under an environment of 25°C is 50 to 200 Pa s, and a value of the viscosity at 0.5 rpm/the viscosity at 50 rpm is 3 to 20.SELECTED DRAWING: Figure 1 【課題】住宅等の建造物内の内装下地材に用いられる内装下地材用粘弾性組成物であって、多孔質層となるよう形成しなくとも高周波数帯域音の伝播性を抑制することができる内装下地材用粘弾性組成物、およびそれを用いた内装下地材、床衝撃音低減積層板、床衝撃音低減構造体を提供する。【解決手段】二枚の板材３，３'と、上記二枚の板材３，３'の間に挟まれた制振層２とからなる内装下地材１における、上記制振層２の形成用の粘弾性組成物であって、ポリマーエマルションを主成分とし増粘剤を含有する粘弾性組成物からなり、２５℃雰囲気下での、その粘弾性組成物の、Ｅ型粘度計による０．５ｒｐｍでの粘度が５０～２００Ｐａ・ｓであり、かつ０．５ｒｐｍでの粘度／５０ｒｐｍでの粘度の値が３～２０である内装下地材用粘弾性組成物により、課題を解決する。【選択図】図１