Composition for sound insulating sheet member, sound insulating sheet member, and sound insulating structure body

Patent metadata

Field	Value
Publication number	US-2021039361-A1
Application number	US-202017078272-A
Country	US
Kind code	A1
Filing date	Oct 23, 2020
Priority date	Apr 27, 2018
Publication date	Feb 11, 2021
Grant date	—

Abstract

Provided is a composition for a sound insulating sheet member, a sound insulating sheet member, and a sound insulating structure body with excellent sound insulating performance. A sound insulating structure body including: a plurality of convex-shaped rubber-elastic resonant portions; and a sheet-like support that supports the resonant portions, wherein the resonant portions have a storage modulus G′ obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 100 MPa or less at 25° C. and 10 kHz, and the areal density of the support is 1.0 kg/m2 or less.

First claim

What is claimed is:

1 . A sound insulating structure body comprising: a plurality of convex-shaped rubber-elastic resonant portions; and a sheet-like support that supports the resonant portions, wherein
the resonant portions have a storage modulus G′ obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 100 MPa or less at 25° C. and 10 kHz, and the areal density of the support is 1.0 kg/m 2 or less.

2 . The sound insulating structure body according to claim 1 , comprising a sound insulating sheet member including the resonant portions and a rubber-elastic sheet portion on which the resonant portions are provided, wherein
the sound insulating sheet member is layered on the support.

3 . The sound insulating structure body according to claim 2 , wherein the sound insulating sheet member is integrally molded.

4 . The sound insulating structure body according to claim 1 , wherein the resonant portions have a storage modulus G′ obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 1 MPa or more at 25° C. and 10 kHz.

5 . The sound insulating structure body according to claim 1 , wherein the resonant portions have a peak temperature of tan δ obtained by dynamic viscoelasticity measurement according to ISO 6721-4 of 20° C. or less at 1 Hz.

6 . The sound insulating structure body according to claim 1 , wherein the resonant portions have a tensile elongation at break at a tensile speed of 5 mm/min of 30% or more in accordance with ISO 527.

7 . The sound insulating structure body according to claim 1 , wherein the resonant portions have a storage modulus G′ obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 80 MPa or less at 25° C. and 5 kHz.

8 . The sound insulating structure body according to claim 1 , wherein the resonant portions include a photo-curable resin.

9 . The sound insulating structure body according to claim 1 , wherein the specific gravity of the plurality of resonant portions is uniform.

10 . The sound insulating structure body according to claim 1 , wherein the height of the sound insulating sheet member is from 50 μm to 10 mm.

11 . A composition for a sound insulating sheet member, wherein
a cured product thereof has rubber elasticity, and the peak temperature of tan δ obtained by dynamic viscoelasticity measurement according to ISO 6721-4 is 20° C. or less at 1 Hz.

12 . The composition for a sound insulating sheet member according to claim 11 , comprising a photo-curable monomer.

13 . The composition for a sound insulating sheet member according to claim 12 , comprising a constituent unit derived from a bifunctional monomer (component (A)) and a constituent unit derived from a monofunctional monomer (component (B)) as the photo-curable monomer, and comprising a radical photopolymerization initiator (component (C)).

14 . A sound insulating sheet member, wherein a cured product of the composition for a sound insulating sheet member according to claim 11 is layered on a support that supports the cured product.

Assignees

• Mitsubishi Chem Corp

Inventors

• Koshitouge Haruki
• Okuno Daichi

Classifications

• G10K11/162

  Selection of materials · CPC title

• G10K11/172 Primary

  using resonance effects · CPC title

• C08F2/50

  with sensitising agents · CPC title

• G10K11/168

  Plural layers of different materials, e.g. sandwiches · CPC title

• E04B2001/8428

  containing specially shaped acoustical bodies, e.g. funnels, egg-crates, fanfolds · CPC title