# US 12,179,467 B2 · Composite sound-absorbing material

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- Number: US 12,179,467 B2
- Document ID: US12179467B2
- Status: Granted
- Kind: B2
- Application number: 17/918,218
- Filed: 2021-05-18
- Published: 2023-05-11
- Granted: 2024-12-31
- Earliest claimed: 2020-05-19
- Assignees: Mitsui Chemicals Asahi Life Materials Co., Ltd.
- Applicants: Asahi Kasei Kabushiki Kaisha
- Inventors: Shinya Yamamuro; Chie Okamura; Yasuo Nakanishi; Takashi Komatsu; Eiji Shiota
- Web page: https://patentgrep.com/patent/US12179467B2

## CPC

- B32B 5/022: {Non-woven fabric}
- G10K 11/168: Plural layers of different materials, e.g. sandwiches
- B32B 5/024: {Woven fabric}
- B32B 5/08: the fibres or filaments of a layer being of different substances {, e.g. conjugate fibres, mixture of different fibres}
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 5/245: {another layer next to it being a foam layer}
- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B32B 5/265: {characterised by one fibrous or filamentary layer being a non-woven fabric layer}
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 7/05: the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection (using interposed adhesives or bonding materials applied in spaced arrangements B32B7/14)
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 37/10: characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B 2250/02: 2 layers
- B32B 2250/03: 3 layers
- B32B 2250/20: All layers being fibrous or filamentary
- B32B 2255/02: on fibrous or filamentary layer
- B32B 2255/102: synthetic resin or rubber layer being a foamed layer
- B32B 2255/26: Polymeric coating
- B32B 2260/021: Fibrous or filamentary layer
- B32B 2260/023: Two or more layers
- B32B 2260/046: Synthetic resin
- B32B 2262/0253: Polyolefin fibres
- B32B 2262/0261: Polyamide fibres
- B32B 2262/0276: Polyester fibres
- B32B 2262/0284: Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
- B32B 2262/101: Glass fibres
- B32B 2266/0228: Aromatic vinyl resin, e.g. styrenic (co)polymers
- B32B 2266/0242: Acrylic resin
- B32B 2266/025: Polyolefin
- B32B 2266/0257: Polyamide
- B32B 2266/0278: Polyurethane
- B32B 2266/0285: Condensation resins of aldehydes, e.g. with phenols, ureas, melamines
- B32B 2266/06: Open cell foam
- B32B 2305/022: Foam
- B32B 2305/026: Porous
- B32B 2305/18: Fabrics, textiles
- B32B 2305/30: Fillers, e.g. particles, powders, beads, flakes, spheres, chips
- B32B 2307/102: Insulating
- B32B 2307/70: Other properties
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/72: Density
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2307/732: Dimensional properties
- B32B 2307/7376: Thickness
- B32B 2605/08: Cars
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR

## Abstract

Provided is a composite sound-absorbing material that can exhibit sound absorption properties in a broad range of low frequencies, intermediate frequencies, and high frequencies even in a low-basis-weight region having low thickness. The composite sound-absorbing material according to the present invention is configured from two or more layers including a base material and a skin material, the skin material being positioned on the outermost layer, wherein the composite sound-absorbing material is characterized in that the ratio (skin material:base material) of the surface area (m2/m2) per unit area of the skin material and the surface area (m2/m2) per unit area of the base material is at least 1:5 and less than 1:40.

## Claims

### Claim 1

A composite sound-absorbing material composed of two or more layers including a base material and a skin material in which the skin material is disposed on an outermost layer,
wherein a ratio of a surface area of the skin material per unit area (m2/m2) and a surface area of the base material per unit area (m2/m2) (skin material:base material) is at least 1:5 and less than 1:40,
the surface area of the skin material per unit area is 10 m2/m2 to 20 m2/m2 and
the surface area of the base material per unit area is 100 m2/m2 to 500 m2/m2.

### Claim 2 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein the ratio of the surface area of the skin material per unit area (m2/m2) and the surface area of the base material per unit area (m2/m2) (skin material:base material) is from 1:10 to 1:35.

### Claim 3 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein a thickness of the composite sound-absorbing material is 40 mm or smaller.

### Claim 4 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein a basis weight of the skin material is 25 g/m2 to 70 g/m2.

### Claim 5 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein the skin material is a nonwoven fabric integrated by thermocompression bonding.

### Claim 6 (depends on 5)

The composite sound-absorbing material according to claim 5, wherein the thermocompression bonding is partial thermocompression bonding.

### Claim 7 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein the skin material is a nonwoven fabric in which at least one ultrafine fiber layer (M) with a mean fiber size of 0.3 μm to 7 μm and at least one thick fiber layer (S) with a mean fiber size of 10 μm to 30 μm are integrated.

### Claim 8 (depends on 7)

The composite sound-absorbing material according to claim 7, wherein a basis weight of the ultrafine fiber layer (M) of the skin material is 1 g/m2 to 40 g/m2.

### Claim 9 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein the skin material comprises a filler that includes a synthetic resin at a content of 3 g/m2 to 20 g/m2.

### Claim 10 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein the base material is an open-cell resin foam.

### Claim 11 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein the base material is a fiber porous material.

### Claim 12 (depends on 1)

The composite sound-absorbing material according to claim 1, wherein at least one layer of the skin material is disposed on a sound source side.

### Claim 13 (depends on 1)

The composite sound-absorbing material according to claim 1, which has a sound absorption coefficient of 30% or greater at a frequency of 1000 Hz, a sound absorption coefficient of 90% or greater at 2500 Hz and a sound absorption coefficient of 80% or greater at 5000 Hz, for sound impinging from the skin material side as measured for normal incidence according to JIS A 1405.