# US 5,705,098 A · Acicular electroconductive tin oxide fine particles and process for producing same

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- Number: US 5,705,098 A
- Document ID: US5705098A
- Status: Granted
- Kind: A
- Application number: 08/688,287
- Filed: 1996-07-29
- Granted: 1998-01-06
- Earliest claimed: 1994-12-27
- Assignees: Ishihara Sanayo Kaisha, Ltd.
- Inventors: Haruo Okuda; Hideo Futamata; Hideo Takahashi; Norihiko Sanefuji
- Web page: https://patentgrep.com/patent/US5705098A

## CPC

- H01B 1/08: oxides
- C01G 19/02: Oxides
- Y10T 428/2911: Mica flake
- Y10T 428/2991: Coated
- 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})
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention provides acicular electroconductive tin oxide fine particles which has a mean diameter of 0.005-1 .mu.m and a mean length of 0.05-10 .mu.m and an aspect ratio of 3 or higher. The invention further provides a process for producing the acicular electroconductive tin oxide fine particles, which comprises firing a starting material containing tin, silicon and an alkali metal halide at 700.degree.-1200.degree. C and removing soluble salts from the resulting fired product.

## Claims

### Claim 1

Acicular electroconductive tin oxide fine particles having a mean diameter of 0.005-1 .mu.m and a mean length of 0.05-10 .mu.m and an aspect ratio of 3 or higher, wherein said acicular tin oxide fine particles further contain silicon in an amount of 0.1 to 10% in terms of SiO.sub.2 based on the weight of SnO.sub.2.

### Claim 2 (depends on 1)

Acicular electroconductive tin oxide fine particles according to claim 1, which have a powder resistance of 10 k.OMEGA.cm or lower.

### Claim 3 (depends on 1)

Acicular electroconductive tin oxide fine particles according to claim 1, which contain antimony.

### Claim 4 (depends on 3)

Acicular electroconductive tin oxide fine particles according to claim 3, which have a powder resistance of 1 k.OMEGA.cm or lower and have a value L* of 80-90.

### Claim 5 (depends on 3)

Acicular electroconductive tin oxide fine particles according to claim 3, wherein the content of antimony in terms of Sb/Sn ratio is 0.1/100-20/100.

### Claim 6 (depends on 3)

Acicular electroconductive tin oxide fine particles according to claim 3, which contain the silicon in an amount of 0.1-10% in terms of SiO.sub.2 based on the weight of SnO.sub.2.

### Claim 7 (depends on 1)

An aqueous dispersion obtained by dispersing the acicular electroconductive tin oxide fine particles of claim 1 in an aqueous medium.

### Claim 8 (depends on 3)

An aqueous dispersion obtained by dispersing the acicular electroconductive tin oxide fine particles containing antimony of claim 3 in an aqueous medium.

### Claim 9 (depends on 1)

An electroconductive composition which comprises 100 parts by weight of a resin based on a solid matter and 3-200 parts by weight of the acicular electroconductive tin oxide fine particles of claim 1.

### Claim 10 (depends on 3)

An electroconductive composition which comprises 100 parts by weight of a resin based on a solid matter and 3-200 parts by weight of the acicular electroconductive tin oxide fine particles containing antimony of claim 3.