# US 7,608,205 B2 · Decentralized solution of microscopic particles and circuit formation device

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- Number: US 7,608,205 B2
- Document ID: US7608205B2
- Status: Granted
- Kind: B2
- Application number: 11/529,263
- Filed: 2006-09-29
- Published: 2007-07-12
- Granted: 2009-10-27
- Earliest claimed: 2005-12-26
- Assignees: Hitachi, Ltd.
- Inventors: Yuichiro Sano; Toru Miyasaka
- Web page: https://patentgrep.com/patent/US7608205B2

## CPC

- H05K 3/1266: {by electrographic or magnetographic printing}
- H05K 2201/0224: Conductive particles having an insulating coating
- H05K 2203/0143: Using a roller; Specific shape thereof; Providing locally adhesive portions thereon
- H05K 2203/0285: Using ultrasound, e.g. for cleaning, soldering or wet treatment
- H05K 2203/0517: Electrographic patterning
- Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Microscopic particle decentralized solution having microscopic particles with different diameters are decentralized, wherein: the microscopic particle decentralized solution has two peaks in a granularity distribution, at a large diameter and a small diameter; and microscopic particle mixtures satisfying the following relationships are decentralized in the solution; R>r and n>3.84×(R/r)3×N, where R is a large particle diameter, r is a small particle diameter, N is the number of large particles, and n is the number of small particle.

## Claims

### Claim 1

A microscopic particle decentralized solution having decentralized microscopic particles with different diameters, wherein:
the microscopic particle decentralized solution has two peaks in a granularity distribution, at a large diameter and a small diameter;
microscopic particle mixtures satisfying the following relationships are decentralized in the solution;
R>r and n>3.84×(R/r)3×N,
where R is a large particle diameter, r is a small particle diameter, N is the number of large particles, and n is the number of small particle,
wherein the large diameter particle and the small diameter particle are conductive material selected from a group consisting of Ag, Cu, Au, Pd, Pt, Ni, W, Mo, or Cr, or its oxide, or its alloy, and a decentralizer layer is formed on the surface of the small diameter particle.

### Claim 2

A microscopic particle decentralized solution having decentralized microscopic particles with different diameters, wherein:
the microscopic particle decentralized solution has two peaks in a granularity distribution, at a large diameter and a small diameter;
microscopic particle mixtures satisfying the following relationships are decentralized in the solution;
R>r and n>3.84×(R/r)3×N,
where R is a large particle diameter, r is a small particle diameter, N is the number of large particles, and n is the number of small particle,
wherein the large diameter particle and the small diameter particle are conductive, material selected from a group consisting of Ag, Cu, Au, Pd, Pt, Ni, W, Mo, or Cr, or its oxide, or its alloy,
wherein the large diameter particle is a cluster of small diameter particles or the large diameter particle has a layer of small-diameter particles on the surface thereof, and
a decentralizer layer is formed on the surface of the small diameter particle.

### Claim 3 (depends on 1)

The microscopic particle decentralized solution according to claim 1, wherein the diameter of the small diameter particle is 100 nm or less.

### Claim 4 (depends on 1)

The microscopic particle decentralized solution according to claim 1, wherein the solvent of the decentralized solution is a nonpolar solvent.

### Claim 5 (depends on 2)

The microscopic particle decentralized solution according to claim 2, wherein the diameter of the small diameter particle is 100 nm or less.