# US 8,465,663 B2 · Composition for electromagnetic wave suppression and heat radiation and method for manufacturing composition for electromagnetic wave suppression and heat radiation

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- Number: US 8,465,663 B2
- Document ID: US8465663B2
- Status: Granted
- Kind: B2
- Application number: 12/696,281
- Filed: 2010-01-29
- Published: 2010-08-12
- Granted: 2013-06-18
- Earliest claimed: 2009-02-09
- Assignees: Sony Corporation
- Applicants: Yoshihiro Kato; Kazuhiko Suzuki; Tatsuo Kumura; Yusuke Kubo
- Inventors: Yoshihiro Kato; Kazuhiko Suzuki; Tatsuo Kumura; Yusuke Kubo
- Web page: https://patentgrep.com/patent/US8465663B2

## CPC

- H05K 9/0083: {comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers (H05K9/0086 takes precedence)}
- H01F 1/28: dispersed or suspended in a bonding agent
- H01F 1/37: in a bonding agent
- H01F 41/0246: {Manufacturing of magnetic circuits by moulding or by pressing powder (magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36)}
- H05K 7/20454: {with a conformable or flexible structure compensating for irregularities, e.g. cushion bags, thermal paste}
- H05K 7/20472: {Sheet interfaces}
- H10W 42/20: protecting against electromagnetic or particle radiation, e.g. light, X-rays, gamma-rays or electrons
- H10W 42/287: {materials for magnetic shielding, e.g. ferromagnetic materials}
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A composition for electromagnetic wave suppression and heat radiation includes: a matrix composed of a high molecular material or a low molecular material; and a magnetic particle filled in the matrix upon mixing a magnetic powder having a relation of {(tap density)/density}≧0.58 with the matrix.

## Claims

### Claim 1

A composition comprising:
a matrix;
magnetic particles in the matrix, the magnetic particles having a relation of {(tap density)/density}≧0.58 with respect to the matrix; and
thermally conductive particles in the matrix, the thermally conductive particles having a relation of {(tap density)/density}≧0.58 with respect to the matrix,
wherein,
the magnetic particles are effective to suppress electromagnetic waves and the thermally conductive particles are effective to cause the composition to radiate heat.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the magnetic particles are amorphous metal particles.

### Claim 3 (depends on 1)

The composition of claim 1, wherein the magnetic particles are at least one of crystallized metal particles and metal alloy particles.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the magnetic particles are ferrite particles.

### Claim 5 (depends on 1)

The composition of claim 1, wherein the thermally conductive particles are at least one member selected from the group consisting of a powder of a thermally conductive ceramic, a metal powder and a metal powder coated with an insulating material.

### Claim 6 (depends on 1)

A molded article made of the composition of claim 1.

### Claim 7 (depends on 6)

The article of claim 6, wherein the article is a member in a sheet form.

### Claim 8 (depends on 1)

A paste comprising the composition of claim 1.

### Claim 9 (depends on 1)

A gel comprising the composition of claim 1.

### Claim 10

A method for manufacturing a composition for electromagnetic wave suppression and heat radiation comprising the steps of:
obtaining a magnetic powder having a relation of {(tap density)/density}≧0.58 with respect to a matrix;
mixing the magnetic powder into the matrix; and
mixing a thermally conductive powder into the matrix,
wherein,
the thermally conductive powder has a relation of {(tap density)/density}≧0.58 with respect to the matrix.

### Claim 11 (depends on 1)

The composition of claim 1, wherein the magnetic particles comprise boron.

### Claim 12 (depends on 1)

The composition of claim 1, wherein the magnetic particles comprise carbon.

### Claim 13 (depends on 10)

The method of claim 10, wherein the magnetic powder is an amorphous metal powder.

### Claim 14 (depends on 10)

The method of claim 10, wherein the magnetic powder is at least one of a crystallized metal power and a metal alloy powder.

### Claim 15 (depends on 10)

The method of claim 10, wherein the magnetic powder is a ferrite powder.

### Claim 16 (depends on 10)

The method of claim 10, wherein the thermally conductive powder is at least one member selected from the group consisting of a powder of a thermally conductive ceramic, a metal powder and a metal powder coated with an insulating material.

### Claim 17 (depends on 10)

The method of claim 10, further comprising forming the composition for electromagnetic wave suppression and heat radiation into a molded article.

### Claim 18 (depends on 17)

The method of claim 17, wherein the molded article is a member in a sheet form.

### Claim 19 (depends on 10)

The method of claim 10, further comprising forming the composition for electromagnetic wave suppression and heat radiation into a paste.

### Claim 20 (depends on 10)

The method of claim 10, wherein the magnetic powder comprises boron.

### Claim 21 (depends on 10)

The method of claim 10, wherein the magnetic powder comprises carbon.