# US 11,910,584 B2 · Composite material

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- Number: US 11,910,584 B2
- Document ID: US11910584B2
- Status: Granted
- Kind: B2
- Application number: 17/262,370
- Filed: 2019-09-27
- Published: 2021-09-16
- Granted: 2024-02-20
- Earliest claimed: 2018-09-28
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Dong Woo Yoo; Yeon Soo Lee; Jin Kyu Lee
- Web page: https://patentgrep.com/patent/US11910584B2

## CPC

- H05K 9/0075: {Magnetic shielding materials}
- H05K 9/0088: {comprising a plurality of shielding layers; combining different shielding material structure}
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 5/32: {at least two} layers being foamed {and next to each other}
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/046: {of foam}
- B32B 15/08: of synthetic resin
- H01F 1/14708: {Fe-Ni based alloys (pure Fe or Ni H01F1/14, H01F1/16 or H01F1/20)}
- H01F 1/15375: {using polymers}
- H01F 1/28: dispersed or suspended in a bonding agent
- B22F 3/1125: {involving a foaming process}
- B32B 2250/02: 2 layers
- B32B 2250/03: 3 layers
- B32B 2250/05: 5 or more layers
- B32B 2250/22: All layers being foamed
- B32B 2266/045: Metal
- B32B 2307/202: Conductive
- B32B 2307/208: Magnetic, paramagnetic
- B32B 2307/212: Electromagnetic interference shielding
- B32B 2307/732: Dimensional properties
- B32B 2457/00: Electrical equipment
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER

## Abstract

The present application relates to a composite material. The present application can provide a composite material having high magnetic permeability and also having excellent mechanical properties such as flexibility. The composite material may be used in various applications, and for example, may be used as an electromagnetic-wave shielding material and the like.

## Claims

### Claim 1

A composite material, comprising:
a first region formed of a first metal foam layer and
a second region formed of a second metal foam layer,
wherein the first metal foam layer has a conductive metal component,
wherein the conductive metal component has a conductivity at 20° C. of 8 MS/m or more,
wherein the second metal foam layer has a soft magnetic metal component, and
wherein the metal foam layers of the first region and the second region are laminated on each other,
said composite material further comprising a conductive material-containing layer, wherein the conductive material-containing layer is on the first or second metal foam layer,
wherein the first metal foam layer and the second metal foam layer are laminated on each other in a staggered pattern such that a portion of a surface of the first metal foam layer facing the second metal foam layer does not overlap with a surface of the second metal foam layer facing the first metal foam layer, and/or a portion of the surface of the second metal foam layer facing the first metal foam layer does not overlap with the surface of the first metal foam layer facing the second metal foam layer, and
the conductive material-containing layer is formed on the portion of the surface of the first metal foam layer facing the second metal foam layer which does not overlap with the surface of the second metal foam layer facing the first metal foam layer, or the portion of the surface of the second metal foam layer facing the first metal foam layer which does not overlap with the surface of the first metal foam layer facing the second metal foam layer.

### Claim 2 (depends on 1)

The composite material according to claim 1, wherein the conductive metal component comprises one or more metals selected from the group consisting of nickel, iron, cobalt, silver, copper, gold, aluminum, calcium, tungsten, zinc, lithium, platinum, tin, lead, titanium, manganese, magnesium and chromium.

### Claim 3 (depends on 1)

The composite material according to claim 1, wherein the soft magnetic metal component is an Fe and Ni alloy, an Fe, Ni and Mo alloy, an Fe, Al and Si alloy, an Fe, Si and B alloy, an Fe, Si and Nb alloy, an Fe, Si and Cu alloy or an Fe, Si, B, Nb and Cu alloy.

### Claim 4 (depends on 1)

The composite material according to claim 1, wherein a total thickness of the first and second metal foam layers is in a range of 10 μm to 2 mm.

### Claim 5 (depends on 4)

The composite material according to claim 4, wherein a ratio (T2/T1) of a thickness (T1) of the first metal foam layer and a thickness (T2) of the second metal foam layer is in a range of 0.2 to 10.

### Claim 6 (depends on 1)

The composite material according to claim 1, further comprising a pressure-sensitive adhesive layer or an adhesive layer between the first and second metal foam layers.

### Claim 7 (depends on 1)

The composite material according to claim 1, wherein the conductive material-containing layer comprises graphite, carbon black, carbon fiber, carbon nanotube, nickel, iron, cobalt, silver, copper, gold, aluminum, calcium, tungsten, zinc, lithium, platinum, tin, lead, titanium, manganese, magnesium or chromium.

### Claim 8 (depends on 1)

The composite material according to claim 1, wherein the conductive material-containing layer is a pressure-sensitive adhesive layer or an adhesive layer.

### Claim 9 (depends on 1)

The composite material according to claim 1, wherein the conductive material-containing layer comprises a resin selected from an acrylic resin, an epoxy resin, a silicone resin, and a urethane resin.

### Claim 10 (depends on 9)

The composite material according to claim 9, wherein the conductive material-containing layer comprises a conductive material in a ratio of 30 to 200 parts by weight relative to 100 parts by weight of the resin.

### Claim 11 (depends on 1)

A composite material structure comprising two or more composite materials according to claim 1, said composite materials joined at a conductive material-containing layer in the composite material.