SOUND ABSORBING/INSULATING MATERIAL

WIPO Patent Application WO/2021/049224

A1

The present invention addresses the problem of providing a sound absorbing/insulating material that has excellent sound insulating properties from the low frequency range to the high frequency range.　This sound absorbing/insulating material includes a fiber layer, a porous layer, and an elastic layer. The fiber layer has an average flow pore diameter of 1.0-60 μm and an air permeability of 30-220 cc/cm2 · s as measured by the Frazier method. The porous layer comprises at least one substance selected from the group consisting of a foam body having continuous holes, a nonwoven fabric, and a fabric. The porous layer has a thickness of 3-40 mm and a density both lower than that of the fiber layer and in the range of 3-150 kg/m3. The elastic layer comprises at least one substance selected from the group consisting of an independent foam body and a rubber sheet. The fiber layer is arranged closer to the side on which sound is incident than the porous layer and the elastic layer.

WO/2003/076178	TARPAULIN HAVING HDPE TWISTED SPLIT YARNS, AND MANUFACTURING METHOD THEREFOR
WO/2019/003095	PROCESS FOR PREPARING SUSPENSIONS OF CARBON NANOTUBES IN POLYMERS, SUSPENSIONS THUS OBTAINED, AND THEIR USE IN PRODUCTION OF COMPOSITES

HATTORI TAKAYUKI (JP)
ITO HIDEMI (JP)

PCT/JP2020/030447

March 18, 2021

August 07, 2020

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JNC CORP (JP)
JNC FIBERS CORP (JP)

B32B5/02; B32B5/18; G10K11/16; G10K11/168

WO2019172016A1

2019-09-12

JP2019043014A	2019-03-22
JP2009512578A	2009-03-26

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