JP3120663B2 - Conductive powder, method for producing the same, conductive dispersion and conductive paint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antimony-doped tin oxide-based conductive powder exhibiting excellent conductivity and excellent dispersibility, a method for producing the same, a conductive dispersion and a conductive paint.

[0002]

2. Description of the Related Art Recently, tin oxide powder containing antimony, that is, antimony-doped tin oxide powder, has been used as a conductive powder. Various improvements have been proposed in order to improve the dispersibility in a dispersion medium, etc.
No. 4174, JP-A-3-263705, JP-A-4-6
No. 2713, JP-A-4-77317, JP-A-4-79
No. 104).

Conventionally, antimony-doped tin oxide powder has been
Generally, a tin-antimony hydroxide mixture is precipitated by adding an alkali to a solution in which a salt of tin and antimony is dissolved, and then the unnecessary salt is washed out. It is manufactured by firing.

[0004] Thus, a conductive dispersion is obtained by dispersing the obtained antimony-doped tin oxide powder in various dispersion media, and a resin is mixed with the conductive dispersion to form a conductive paint, which is used as a base material. By applying to the surface of the material,
An antistatic coating or a conductive coating is formed.

Conventionally, surface treatment of antimony-doped tin oxide powder with silica has been proposed to improve the dispersibility of antimony-doped tin oxide powder in an aqueous conductive dispersion (Japanese Patent Laid-Open No. 4-79104). ).

[0006]

In the above-mentioned conventional method, the silica added for the purpose of improving the dispersibility of the antimony-doped tin oxide powder has an isoelectric point of 2 to 3, and therefore has a neutral or higher neutrality. Although the dispersibility of the antimony-doped tin oxide powder is improved in the pH range described above, the dispersibility is deteriorated in the low pH range of pH 4 or less.

That is, the powder surface potential in water at a pH near neutrality is increased to minus (-) by silica treatment, and the particles are repelled by electrostatic repulsion to improve the dispersibility. In particular, silica treatment is effective for enhancing dispersibility in a dispersion medium having a high dielectric constant such as water.

[0008] However, in the treatment with silica alone, pH 2
3 has an isoelectric point of silica, so that the particles have poor dispersibility in the acidic region and cause aggregation.

For example, when a conductive dispersion obtained by dispersing antimony-doped tin oxide powder is applied to a CRT substrate surface for antistatic purposes and used for preparing a paint, ethyl silicate or the like mixed and used is used. Or an alkoxide of zirconium for adjusting the strength and refractive index of the coating layer. In this case, since the acid is added as a catalyst for accelerating the hydrolysis of the alkoxide, the pH of the liquid finally becomes acidic. Under these acidic conditions, the antimony-doped tin oxide powder treated with silica has a similar isoelectric point as described above, so that the antimony-doped tin oxide powder has poor dispersibility.

[0010] The antimony-doped tin oxide powder treated with silica has too high a polarity on the surface and is unsuitable for dispersion in an organic dispersion medium other than water having a low polarity.

For these reasons, for application to various pH ranges or various dispersion media, silica treatment cannot provide a sufficient effect of improving dispersibility.

The present invention solves the above-mentioned conventional problems and has a low p.
It is an object of the present invention to provide a conductive powder exhibiting high dispersibility even in an H region or an organic dispersion medium, a method for producing the same, a conductive dispersion and a conductive paint.

[0013]

According to a first aspect of the present invention, the conductive powder comprises at least one selected from the group consisting of tungsten oxide, antimony oxide, a hydrate of tungsten oxide, and a hydrate of antimony oxide. It is characterized by comprising antimony-doped tin oxide powder supported on the surface.

According to a second aspect of the present invention, there is provided the conductive powder according to the first aspect, wherein tungsten oxide, antimony oxide,
The loading amount of one or more selected from the group consisting of a hydrate of tungsten oxide and a hydrate of antimony oxide is W
It is characterized by being 0.01 to 40% by weight in terms of O ₃ and / or Sb ₂ O ₅ .

[0015] The conductive powder of the third aspect is the first or second aspect.
Specific surface area of 10 to 100 m ² /
g.

According to a fourth aspect of the present invention, there is provided a method for producing a conductive powder, comprising forming a coprecipitate of a hydrate of tin oxide and antimony oxide from a solution containing a tin compound, an antimony compound and a tungsten compound by a neutralization reaction. A hydrate of tungsten oxide is formed on the surface of the coprecipitate, and the obtained coprecipitate is fired.

According to a fifth aspect of the present invention, there is provided a method for producing a conductive powder according to the first aspect, wherein the coprecipitate of a hydrate of tin oxide and antimony oxide is used. The liquid pH at the time of generation is 2.0 or more, and the liquid pH at the time of generation of a hydrate of tungsten oxide is 12 or less.

According to a sixth aspect of the present invention, there is provided a method for producing a conductive powder according to the first aspect, wherein the dispersion obtained by dispersing the antimony-doped tin oxide powder in a dispersion medium contains a tungsten compound. And / or adding an antimony compound to precipitate a hydrate of tungsten oxide and / or a hydrate of antimony oxide on the surface of the antimony-doped tin oxide powder.

A method for producing a conductive powder according to a seventh aspect is the method for producing a conductive powder according to the first aspect, wherein the dispersion obtained by dispersing the antimony-doped tin oxide powder in a dispersion medium contains a tungsten compound. And / or adding an antimony compound to precipitate a hydrate of tungsten oxide and / or a hydrate of antimony oxide on the surface of the antimony-doped tin oxide powder, followed by firing.

[0020] The conductive dispersion according to the eighth aspect is characterized in that the conductive powder according to the first aspect is dispersed in water.

According to a ninth aspect of the present invention, there is provided a conductive paint comprising a mixture of the conductive dispersion according to the eighth aspect and a water-soluble resin.

According to a tenth aspect of the present invention, there is provided a conductive dispersion obtained by dispersing the conductive powder according to the first aspect in an organic dispersion medium.

[0023] The conductive dispersion according to the eleventh aspect is the tenth aspect.
In conducting the dispersion is an organic solvent is methanol, ethanol, i Sopu b pills alcohol, butanol, benzene, acetone, ether, toluene, xylene, one or more selected from the group consisting of ethylene glycol and hexane It is characterized by the following.

According to a twelfth aspect of the present invention, there is provided a conductive paint comprising a mixture of the conductive dispersion according to the tenth aspect and a resin.

Hereinafter, the present invention will be described in detail.

The conductive powder of the present invention includes tungsten oxide (WO ₃ ), antimony oxide (Sb ₂ O ₅ ), hydrate of tungsten oxide (WO ₃ .nH ₂ O) and hydrate of antimony oxide (Sb one or more of the ₂ O ₅ · nH ₂ O) antimony-doped tin oxide powder obtained by carried on the surface.

In the following, one or more of tungsten oxide, antimony oxide, a hydrate of tungsten oxide, and a hydrate of antimony oxide supported on the surface of antimony-doped tin oxide powder are referred to as “support components”. ].

In the conductive powder of the present invention, if the amount of the supported component is too small, the effect of improving the dispersibility according to the present invention cannot be sufficiently obtained, and if the amount is too large, the conductivity is reduced.
Supported amount of the supported component is preferably a 0.01 to 40 wt% in terms _of WO ₃ and / or Sb ₂ O ₅ equivalent amount relative to the conductive powder weight.

Therefore, in the present invention, the composition of the conductive powder is 0.01 to 40% by weight of antimony oxide (Sb ₂ O ₅ ) derived from antimony-doped tin oxide powder, and the loading component (WO ₃ and / or Sb ₂ O). ₅ equivalent) 0.01 to 40 wt%, it is preferably made of the balance substantially tin oxide (SnO _2).

Further, if the specific surface area of the conductive powder is too large or too small, sufficient dispersibility cannot be obtained.
It is preferably from 0 to 100 m ² / g.

The conductive powder of the present invention can be easily prepared, for example, as follows according to the method for producing the conductive powder of the present invention.

[0032] If necessary, an alkali or acid is added to the solution containing the tin compound, the antimony compound and the tungsten compound to adjust the pH to preferably 2.0 or more, so that each hydrate of SnO ₂ and Sb ₂ O ₅ A coprecipitate is formed, and then, preferably at pH 12 or lower,
O ₃ hydrate is formed on the surface of the coprecipitate. After filtering and washing this, it is 1.0 to 10 at 300 to 800 ° C.
Bake for about an hour. Thereby, a conductive powder in which tungsten oxide is supported on the surface of antimony-doped tin oxide powder is obtained.

Since SnO ₂ and Sb ₂ O ₅ have a higher hydration rate than WO ₃ , first, in this process, the hydrates of SnO ₂ and Sb ₂ O ₅ are first shared. The nucleus is formed by sinking, and then WO ₃
Hydrate precipitates.

The antimony-doped tin oxide powder produced according to a conventional method is dispersed in a dispersion medium such as water, and a tungsten compound and / or an antimony compound are added to the dispersion, and if necessary, an acid is added to adjust the solution pH. 2.0-12
To form a hydrate of WO ₃ and / or a hydrate of Sb ₂ O _{5 on} the surface of the antimony-doped tin oxide powder. This is filtered off and dried. Thus, a conductive powder in which a hydrate of tungsten oxide and / or a hydrate of antimony oxide is supported on the surface of the antimony-doped tin oxide powder is obtained.

In the above, the obtained dry powder is mixed with 30
It is baked at 0 to 800 ° C. for about 1.0 to 10 hours. Thus, a conductive powder having tungsten oxide and / or antimony oxide supported on the surface of the antimony-doped tin oxide powder is obtained.

As the tin compound, tin chloride (S
_{nCl 4, SnCl 2, SnCl 2} nH 2 O), tin oxychloride _{(SnO · SnCl 2, SnOCl 2} ), stannate, can be used stannates, etc., as the antimony compound, antimony chloride (SbCl _3, SbCl ₅ )
And the like, and as the tungsten compound,
Sodium tungstate (Na ₂ WO ₄ ), potassium tungstate (K ₂ WO ₄ ), calcium tungstate (CaWO ₄ ), tungsten chloride (WCl ₆ ) and the like can be used.

In the above method, the pH during the neutralization reaction for forming a coprecipitate of SnO ₂ and Sb ₂ O ₅ hydrates depends on the production efficiency of Sn (OH) ₄ hydrolysis products. In order to improve the pH, pH 2.0 to 12.0 (particularly p
H2.0 to 9.0) is particularly preferable. That is, p
If it is less than H2.0, hydrolysis of SnCl ₄ or the like hardly occurs. As the alkali used for the neutralization reaction, ordinary alkalis such as sodium hydroxide and potassium hydroxide can be used, and these are added as a 0.1 to 10 N aqueous alkali solution. Therefore, in the method of
There is no particular limitation on the method of preparing a solution containing a tin compound, an antimony compound and a tungsten compound and performing a neutralization reaction, and an alkali is added to a solution containing a tin compound, an antimony compound and a tungsten compound to cause a neutralization reaction. Alternatively, one or two of a tin compound, an antimony compound and a tungsten compound, for example, a tungsten compound may be added together with an alkali to cause a neutralization reaction.

In the method of SnO ₂ and Sb ₂ O
_In order to form a hydrate of WO _{3 on} the surface of the coprecipitate of the hydrate of _5, the pH of the solution is particularly preferably from 2.0 to 12.0. If the pH is less than 2.0, hydrolysis of the tungsten compound is unlikely to occur, and hydrate formation is slow. pH
If it exceeds 12.0, tungstate is formed and no hydrate is formed.

The acid used for the pH adjustment includes:
Hydrochloric acid, sulfuric acid, nitric acid and the like can be mentioned, and hydrochloric acid is particularly preferable and is added as an aqueous solution of 0.1 to 10N.

The conductive dispersion of the present invention is preferably prepared by adding the thus obtained conductive powder of the present invention to water, preferably in 0.1%.
It is dispersed at a concentration of about 40% by weight.

The conductive dispersions according to the tenth and eleventh aspects are characterized in that the conductive powder of the present invention obtained as described above is obtained by mixing methanol, ethanol, isopropyl alcohol, butanol, benzene, acetone, ether, toluene, xylene, ethylene. It is preferably dispersed in an organic dispersion medium such as glycol or hexane at a concentration of 0.1 to 40% by weight.

The conductive paint according to the ninth aspect is obtained by mixing the aqueous conductive dispersion according to the eighth aspect with a water-soluble resin. Examples of the water-soluble resin include gelatin, polyvinyl alcohol and water-soluble acrylic resin. The content in the paint is preferably 0.1 to 70% by weight, and the content of the conductive powder is preferably 0.1 to 70% by weight. In this conductive paint, if necessary, a zirconium compound or the like for improving the refractive index of the coating film may be mixed at 0.1 to 20% by weight.

The conductive paint according to the twelfth aspect is characterized in that:
11 is obtained by mixing an organic conductive dispersion liquid with a resin. Examples of the resin include phenol resin, alkyd resin, styrene butadiene resin, polyurethane resin, silicon resin, titanium resin, fluorine resin, epoxy resin, and vinyl chloride. , Acrylic resin, ethyl silicate, silicone and the like can be used.
70% by weight, conductive powder content is 0.1-70% by weight
It is preferred that In this conductive paint, if necessary, a zirconium compound or the like for improving the refractive index of the coating film may be mixed at 0.1 to 20% by weight.

[0044]

[Action] Tungsten oxide (WO ₃ ) has an isoelectric point of 0.5
The antimony oxide (Sb ₂ O ₅ ) has an isoelectric point of 0.4 or less, and thus has an isoelectric point even lower than that of silica. By conducting a surface treatment on the tin oxide powder, a conductive powder having excellent dispersibility even in an organic dispersion medium other than a low pH region or water can be obtained.

According to the conductive powder of the second aspect, a conductive powder having both good conductivity and good dispersibility is provided.

According to the conductive powder of the third aspect, a conductive powder having further improved dispersibility is provided.

According to the method of the fourth, sixth, and seventh aspects, the conductive powder of the present invention can be easily and efficiently produced.

According to the method of claim 5, the yield is stabilized.

According to the eighth aspect, there is provided an aqueous conductive dispersion in which conductive powder is uniformly dispersed.

According to the tenth and eleventh aspects, there is provided an organic conductive dispersion in which conductive powder is uniformly dispersed.

According to the ninth and twelfth aspects, there is provided a conductive paint capable of forming a high-performance conductive coating film using such a conductive dispersion.

[0052]

The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples unless it exceeds the gist.

The specific resistance, specific surface area and dispersibility of the conductive fine powders obtained in Examples and Comparative Examples were examined by the following methods.

Specific Resistance The conductive fine powder was molded into a cylindrical shape at a pressure of 100 kg / cm ² , and the DC resistance of the molded body was measured, and the specific resistance of the powder was determined from the following equation.

[0055]

(Equation 1)

Specific Surface Area 0.1 to 0.5 g of the conductive fine powder was sampled and heated at 150 ° C. for 3 hours.
Degassed in nitrogen gas for 0 minutes. Then, a specific surface area measuring device (a quick specific surface area measuring device SA-1000 manufactured by Shibata Chemical Co., Ltd.)
The specific surface area was measured by a BET method using nitrogen.

Dispersibility 5 parts by weight of ethanol, 4 parts by weight of ethyl silicate (28% by weight) and 1 part by weight of water are sequentially mixed with 1 part by weight of a slurry of 17% by weight of conductive fine powder in water, A test solution was prepared by adding nitric acid so that the pH of the mixture became 2.

This preparation was placed in a 100 cc graduated cylinder and allowed to stand all day and night, and the degree of sedimentation was examined.

Example 1 A 60% by weight aqueous solution of tin chloride 39 was added to 5 liters of water at 80 ° C.
A mixed solution of 0 g and 36 g of a 60 wt% antimony chloride aqueous solution, and 1.5 g of tungsten oxide (WO ₃ )
/ L of 3N sodium hydroxide aqueous solution in which sodium tungstate is dissolved at the same time over a period of 60 minutes so that the pH of the system is maintained at 6 to 7 to form a coprecipitate of a hydrate of tin oxide and antimony oxide. Generated. Next, the pH of the system was adjusted to 3 by adding hydrochloric acid, followed by filtration and washing until the electric conductivity of the filtrate became 50 μS or less. The obtained cake was dried, baked in an electric furnace at 550 ° C. for 3 hours, and pulverized with a mill to obtain a conductive fine powder having a specific surface area shown in Table 1.

This conductive fine powder was obtained by supporting tungsten oxide on the surface of antimony-doped tin oxide powder in the amount shown in Table 1, and the specific resistance and dispersibility were measured as shown in Table 1. Met.

Example 2 In Example 1, sodium tungstate was replaced with WO ₃
In the same manner, a conductive fine powder having a specific surface area shown in Table 1 was obtained except that a 3N aqueous sodium hydroxide solution in which 0.5 g / l was dissolved was used.

This conductive fine powder was obtained by supporting tungsten oxide on the surface of antimony-doped tin oxide powder in the amount shown in Table 1. The measurement results of the specific resistance and dispersibility were as shown in Table 1. Met.

Example 3 In Example 1, sodium tungstate was replaced with WO ₃
In this manner, a conductive fine powder having a specific surface area shown in Table 1 was obtained in the same manner except that a 3N aqueous sodium hydroxide solution dissolved at 10 g / l was used.

This conductive fine powder was prepared by carrying tungsten oxide on the surface of antimony-doped tin oxide powder in the amount shown in Table 1, and the specific resistance and dispersibility were measured as shown in Table 1. Met.

Example 4 In the same manner as in Example 1 except that the temperature of the water during the reaction was set at 50 ° C. and the pH of the solution during the hydrolysis reaction was maintained at 2 to 4, the conductivity of the specific surface area shown in Table 1 was similarly measured. A fine powder was obtained.

This conductive fine powder was obtained by loading tungsten oxide on the surface of antimony-doped tin oxide powder in the loading amounts shown in Table 1. The measurement results of specific resistance and dispersibility were as shown in Table 1. Met.

Example 5 A 60% by weight aqueous solution of tin chloride 3 was added to 5 liters of water at 80 ° C.
Hydration of tin oxide and antimony oxide by simultaneously adding a mixture of 90 g and 36 g of an aqueous solution of 60% by weight antimony chloride and a 3N aqueous sodium hydroxide solution over a period of 60 minutes so that the pH of the system is maintained at 6 to 7. A coprecipitate of the product was formed. Next, the pH of the system was adjusted to 3 by adding hydrochloric acid, followed by filtration and washing until the electric conductivity of the filtrate became 50 μS or less. After drying the obtained cake, it is heated at 550 ° C. in an electric furnace.
For 3 hours and pulverized with a mill to obtain antimony-doped tin oxide powder.

This powder was added to water in an amount of 20% by weight and stirred to form a suspension, and 1% by weight of sodium tungstate corresponding to WO ₃ was added to the antimony-doped tin oxide powder. And stirred. Next, the pH is 6 ~
After the addition of hydrochloric acid to a pH of 7, the filtrate was washed until the electric conductivity of the filtrate became 50 μS or less. 1 cake obtained
After drying at 20 ° C., the mixture was pulverized with a mill to obtain a conductive fine powder having a specific surface area shown in Table 1.

This conductive fine powder is obtained by supporting the hydrate of tungsten oxide on the surface of the antimony-doped tin oxide powder in the supported amounts shown in Table 1. The measurement results of the specific resistance and dispersibility are shown in Table 1. As shown in FIG.

Example 6 In Example 5, a 60% by weight aqueous solution of antimony chloride corresponding to 1.5% by weight of Sb ₂ O _{5 with} respect to antimony-doped tin oxide powder was replaced with tin oxide powder in place of sodium tungstate. A conductive fine powder having a specific surface area shown in Table 1 was obtained in the same manner except that the powder was added to the water suspension.

This conductive fine powder is obtained by carrying hydrate of antimony oxide on the surface of antimony-doped tin oxide powder in the supported amounts shown in Table 1. The measurement results of specific resistance and dispersibility are shown in Table 1. As shown in FIG.

Example 7 A conductive fine powder having a specific surface area shown in Table 1 was obtained in the same manner as in Example 5, except that sodium tungstate and sodium antimonate were added in combination.

This conductive fine powder is obtained by carrying a hydrate of tungsten oxide and a hydrate of antimony oxide on the surface of an antimony-doped tin oxide powder in the loading amounts shown in Table 1. The results of measurement of the dispersibility were as shown in Table 1.

Example 8 In Example 5, the obtained fine powder was further heated at 550 ° C. for 3 hours.
After sintering for a time, a conductive fine powder having a specific surface area shown in Table 1 was obtained.

This conductive fine powder was obtained by loading tungsten oxide on the surface of antimony-doped tin oxide powder at the loadings shown in Table 1. The measurement results of specific resistance and dispersibility were as shown in Table 1. Met.

Example 9 In Example 6, the obtained fine powder was further heated at 550 ° C. for 3 hours.
After sintering for a time, a conductive fine powder having a specific surface area shown in Table 1 was obtained.

This conductive fine powder was prepared by loading antimony oxide on the surface of antimony-doped tin oxide powder in the amount shown in Table 1. The measurement results of the specific resistance and dispersibility are shown in Table 1. Met.

Example 10 In Example 7, the obtained fine powder was further heated at 550 ° C.
After sintering for a time, a conductive fine powder having a specific surface area shown in Table 1 was obtained. In this conductive fine powder, antimony-doped tin oxide powder has tungsten oxide and antimony oxide on the surface thereof as shown in Table 1.
The specific resistance and the dispersibility were measured as shown in Table 1.

Comparative Example 1 A conductive fine powder was obtained in the same manner as in Example 1 except that sodium tungstate was not added. Table 1 shows the specific surface area, specific resistance and dispersibility of the obtained conductive fine powder. Indicated.

Comparative Example 2 A conductive fine powder was obtained in the same manner as in Example 4 except that sodium tungstate was not added. The specific surface area, specific resistance and dispersibility of the obtained conductive fine powder are shown in Table 1. Indicated.

Comparative Example 3 A conductive fine powder was obtained in the same manner as in Example 6 except that antimony chloride was not added. The specific surface area, specific resistance and dispersibility of the obtained conductive fine powder are shown in Table 1. Was.

Comparative Example 4 A conductive fine powder was obtained and obtained in the same manner as in Example 1, except that 1.5 g / l of sodium silicate was added as SiO ₂ instead of adding sodium tungstate. Silica loading amount of conductive fine powder, specific surface area,
Table 1 shows the specific resistance and the dispersibility.

[0083]

[Table 1]

As is clear from Table 1, the conductive powder of the present invention has excellent conductivity and dispersion stability in a low pH range. In particular, in the case of use in a paint mixed with ethyl silicate, its dispersion stability is effectively exhibited.

[0085]

As described in detail above, according to the conductive powder of the present invention, a high-performance conductive powder exhibiting excellent dispersibility even in a low pH region or an organic dispersion medium is provided.

According to the second aspect of the present invention, a conductive powder having good conductivity and good dispersibility can be provided.

According to the conductive powder of the third aspect, a conductive powder having further excellent dispersibility is provided.

According to the method of the fourth, sixth, and seventh aspects, the conductive powder of the present invention can be easily and efficiently manufactured.

According to the method of claim 5, the production efficiency is improved and the yield is stabilized.

According to the eighth aspect, there is provided an aqueous conductive dispersion in which conductive powder is uniformly dispersed.

According to the tenth and eleventh aspects, there is provided an organic conductive dispersion in which conductive powder is uniformly dispersed.

According to the ninth and twelfth aspects, there is provided a conductive paint capable of forming a high-performance conductive coating film using such a conductive dispersion.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI H01B 1/00 H01B 1/00 A (56) References JP-A-5-279042 (JP, A) JP-A-2-194064 ( JP, A) JP-A-61-295234 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09C 1/00-3/12 C01G 30/00-30/02 C01G 41 / 00-41/04 C09D 5/24 C09D 11/00-11/20 H01B 1/00

Claims (12)

(57) [Claims] 1. An antimony-doped tin oxide powder having one or more selected from the group consisting of tungsten oxide, antimony oxide, a hydrate of tungsten oxide and a hydrate of antimony oxide supported on the surface. Conductive powder. 2. The conductive powder according to claim 1, wherein one or more selected from the group consisting of tungsten oxide, antimony oxide, a hydrate of tungsten oxide and a hydrate of antimony oxide has WO ₃ conversion and / or Sb
A conductive powder characterized by being 0.01 to 40% by weight in terms of ₂ O ₅ . 3. The conductive powder according to claim 1, wherein
A conductive powder having a specific surface area of 10 to 100 m ² / g. 4. A coprecipitate of a hydrate of tin oxide and antimony oxide is formed by a neutralization reaction from a solution containing a tin compound, an antimony compound and a tungsten compound;
Then, a hydrate of tungsten oxide is formed on the surface of the coprecipitate, and the obtained coprecipitate is fired. 5. The method according to claim 4, wherein the pH of the solution at the time of forming a coprecipitate of a hydrate of tin oxide and antimony oxide is 2.
A method for producing a conductive powder, wherein the pH of the solution at the time of generation of a hydrate of tungsten oxide is 12 or less. 6. A tungsten compound and / or an antimony compound are added to a dispersion obtained by dispersing antimony-doped tin oxide powder in a dispersion medium, and the surface of the antimony-doped tin oxide powder has tungsten oxide hydrate and /
The method for producing a conductive powder according to claim 1, wherein a hydrate of antimony oxide is precipitated. 7. A tungsten compound and / or an antimony compound are added to a dispersion obtained by dispersing antimony-doped tin oxide powder in a dispersion medium, and the surface of the antimony-doped tin oxide powder has tungsten oxide hydrate and /
The method for producing a conductive powder according to claim 1, wherein firing is performed after depositing a hydrate of antimony oxide. 8. A conductive dispersion obtained by dispersing the conductive powder according to claim 1 in water. 9. A conductive paint obtained by mixing the conductive dispersion according to claim 8 with a water-soluble resin. 10. A conductive dispersion obtained by dispersing the conductive powder according to claim 1 in an organic dispersion medium. 11. The conductive dispersion according to claim 10, wherein
The organic solvent is methanol, ethanol, isopropoxy Ropi alcohol, butanol, benzene, acetone, ether,
A conductive dispersion, which is one or more selected from the group consisting of toluene, xylene, ethylene glycol, and hexane. 12. A conductive paint obtained by mixing the conductive dispersion according to claim 10 with a resin.