# US 2003/0201427 A1 · Conductiv powder and conductive composition

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- Number: US 2003/0201427 A1
- Document ID: US20030201427A1
- Status: Published application
- Kind: A1
- Application number: 10/426,806
- Filed: 2003-05-01
- Published: 2003-10-30
- Earliest claimed: 2001-01-24
- Assignees: Kaken Tech Co., Ltd.
- Inventors: Shigeo Hori; Hirohiko Furui; Tadashi Kubota; Yoshiaki Kubota
- Web page: https://patentgrep.com/patent/US20030201427A1

## CPC

- H05K 1/097: {Inks comprising nanoparticles and specially adapted for being sintered at low temperature (H05K1/095 takes precedence)}
- B22F 1/00: Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- H01B 1/22: the conductive material comprising metals or alloys
- H05K 3/321: by conductive adhesives
- B22F 2998/00: Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy
- H05K 2203/0307: Providing micro- or nanometer scale roughness on a metal surface, e.g. by plating of nodules or dendrites
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- 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
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

The present invention provides a conductive powder, which can show the high conductivity even in condition that a resin is included, and a conductive composition using the same. In such a conductive powder and a conductive composition, the conductive powder having a convex radically extended and a concave among the convex having the following features; (1) the convex and concave of the adjoining conductive powders are mutually press-fitted to form a conductive path(first feature). (2) the shape of the convex is at least one shape selected from the group essentially consisting of the needle shape, a rod shape and a petal shape(second feature). (3) the electrical resistivity is within a range of 5×10−6 to 1×10−3 Ω·cm in condition that a resin is included (third feature).

## Claims

### Claim 1

A conductive powder having a convex radically extended and a concave among the convex, wherein the said convex and concave of the adjoining conductive powders are mutually press-fitted to form a conductive path.

### Claim 2

A conductive powder having a convex radically extended and a concave among the convex, wherein the shape of the convex is at least one shape selected from the group essentially consisting of the needle shape, a rod shape and a petal shape.

### Claim 3

A conductive powder having a convex radically extended and a concave among the convex, wherein the electrical resistivity (epoxy resin 30 pbw./conductive powder 70 pbw.) is within a range of 5×10−6 to 1×103 Ω·cm in condition that a resin is included.

### Claim 4 (depends on 1)

The conductive powder according to claim 1, wherein the average particle size is within a range of about 0.1 to 22 μm.

### Claim 5 (depends on 1)

The conductive powder according to claim 1, wherein the surface treatment is carried out on the surface of the said convex.

### Claim 6 (depends on 1)

The conductive powder according to claim 1, wherein the main component of the conductive powder is Ag or Ni.

### Claim 7 (depends on 1)

The conductive powder according to claim 1, wherein a conductive powder other than the said conductive powder having a convex radically extended and a concave among the convex, is included in the content of 1 to 90 wt. % per the total weight.

### Claim 8 (depends on 1)

The conductive powder according to claim 1, wherein a core material which is at least one particle selected from the group consisting of an organic type particle, a metal type particle and a ceramic type particle is included into the conductive powder.

### Claim 9 (depends on 8)

The conductive powder according to claim 8, wherein the average particle size of the core material is within a range of 0.01 to 10 μm.

### Claim 10

A conductive composition including a conductive powder having a convex radically extended and a concave among the convex and a resin, wherein the said convex and concave of the adjoining conductive powders are mutually press-fitted to form a conductive path.

### Claim 11

A conductive composition including a conductive powder having a convex radically extended and a concave among the convex and a resin, wherein the shape of the convex is at least one shape selected from the group essentially consisting of a needle shape, a rod shape and a petal shape.

### Claim 12

A conductive composition including a conductive powder having a convex radically extended and a concave among the convex and a resin, wherein the electrical resistivity (epoxy resin 30 pbw./conductive powder 70 pbw.) is within a range of 5×10−6 to 1×10−3 Ω·cm in condition that a resin is included.

### Claim 13 (depends on 10)

The conductive composition according to claim 10, wherein the content of the conductive powder is within a range of 1 to 900 pbw. based on 100 pbw. of a resin.

### Claim 14 (depends on 10)

The conductive composition according to claim 10, wherein the said resin is a non-solvent type resin.

### Claim 15 (depends on 10)

The conductive composition according to claim 10, wherein a core material which strengthens the crystal growth reaction and is at least one particle selected from the group consisting of an organic type particle, a metal type particle and a ceramic type particle is included into the conductive powder.