公开(公告)号：US11951729B2

公开(公告)日：2024-04-09

申请号：US17269452

申请日：2019-05-30

Applicant: Nitto Denko Corporation

Inventor： Shigeki Ishiguro ,  Kayo Shimokawa ,  Tetsuya Otsuka ,  Hidetoshi Maikawa

IPC: B32B5/26 ,  B32B5/02 ,  B32B7/12 ,  G10K11/168

CPC classification number: B32B5/26 ,  B32B5/022 ,  B32B7/12 ,  G10K11/168 ,  B32B2262/0253 ,  B32B2262/105 ,  B32B2307/102 ,  B32B2307/3065 ,  B32B2307/72

Abstract: A laminated sheet includes a first porous layer including a plurality of fibers of at least one of inorganic fiber or carbonized fiber; and a second porous layer formed of a plurality of organic fibers, wherein the laminated sheet has a surface density of greater than or equal to 400 g/m2 and less than or equal to 1550 g/m2, wherein the second porous layer is formed of the plurality of organic fibers having a mean diameter of fibers being greater than or equal to 0.5 μm and less than or equal to 14 μm, and wherein, expressing a total volume of solids and voids filling a unit volume of the second porous layer as 100%, a percentage of the solids is greater than or equal to 1.0% and less than or equal to 8.0%.

公开(公告)号：US11270680B2

公开(公告)日：2022-03-08

申请号：US16385112

申请日：2019-04-16

Applicant: Nitto Denko Corporation

Inventor： Tetsuya Otsuka ,  Naoto Hayashi ,  Takeshi Sutou

IPC: G10K11/168 ,  G10K11/16 ,  F02B77/13 ,  B32B5/14 ,  D04H3/004 ,  B60R13/08 ,  B32B5/26 ,  B32B7/02 ,  B32B37/00 ,  B62D29/04 ,  E04B1/84 ,  B62D25/04

Abstract: A soundproof structure includes a porous fibrous body that attenuates incident sound waves, wherein the fibrous body is formed of fibers having an average fiber diameter of 0.5 μm or more and 5 μm or less, and includes a surface layer on which the sound waves are incident and a propagation layer that is stacked with the surface layer and that propagates the sound waves from the surface layer, and wherein the propagation layer includes a high density layer having a density higher than a density of the surface layer.

公开(公告)号：US10105929B2

公开(公告)日：2018-10-23

申请号：US14914359

申请日：2014-08-21

Applicant: NITTO DENKO CORPORATION

Inventor： Kohei Doi ,  Kunio Nagasaki ,  Tetsuya Otsuka ,  Mika Okada ,  Kazumichi Kato ,  Hideyuki Tokuyama ,  Tsunaki Kitahara ,  Tadao Takahashi ,  Kiichiro Matsushita

IPC: B32B7/12 ,  B32B5/18 ,  H04M1/18 ,  H05K5/00 ,  C08J9/30 ,  C09J7/02 ,  B32B7/06 ,  B32B27/06 ,  B32B27/30 ,  B32B27/36 ,  H04M1/02

Abstract: A foamed sheet according to the present invention has a thickness of 30 to 500 μm and includes a foam. The foam has a density of 0.2 to 0.7 g/cm3, an average cell diameter of 10 to 150 μm, and a peak top of loss tangent (tan δ) occurring in a temperature range of from −30° C. to 30° C., where the loss tangent is defined as the ratio of a loss modulus to a storage modulus determined at an angular frequency of 1 rad/s in dynamic viscoelastic measurement of the foam. The foam preferably has a maximum of the loss tangent (tan δ) in the temperature range of from −30° C. to 30° C. of 0.2 or more.