JP4888643B2 - Conductive polymer fine particle dispersion and conductive paint using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive polymer fine particle dispersion and a conductive paint using the same. <P>SOLUTION: The conductive polymer fine particle dispersion is obtained by polymerizing monomers for forming a conductive polymer by chemical oxidation in the water in the presence of a reactive emulsifier, and the surface of the polymer obtained by polymerizing the monomers for forming the conductive polymer is coated with a polymer of the reactive emulsifier, or coated with a polymer formed by copolymerization of the reactive emulsifier and radically polymerizing monomers copolymerizable with the reactive emulsifier; and the conductive paint contains the conductive polymer fine particle dispersion. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

The present invention relates to a conductive polymer fine particle dispersion that can be used as a raw material for a conductive paint, and a conductive paint that can be applied to a substrate using the conductive polymer fine particle dispersion. For more details,
1) Excellent long-term storage stability
2) By applying to a substrate and drying, a conductive layer with excellent adhesion to the substrate can be easily formed,
3) The formed conductive layer can maintain high transparency with a thin film,
4) The conductive layer has high wear resistance,
5) Further, the present invention relates to a conductive paint having excellent characteristics such as being able to maintain a low resistance value without depending on humidity in an applied state, and a conductive polymer fine particle dispersion used for the conductive paint.

  Polypyrrole has high conductive performance and is stable in the air, so conductive paint, rust preventive paint, semiconductor material, capacitor electrolyte, hole transport material for organic EL elements, secondary battery electrode material, etc. Expected to be used in For example, it is known that when a pyrrole monomer is dispersed in water and polymerized using ferric chloride as a catalyst, polypyrrole incorporating a chlorine anion as a dopant can be easily obtained. However, the polypyrrole obtained by such a method becomes a black powdery aggregate, is insoluble in any solvent and water, and is extremely difficult to handle. In addition, since the polypyrrole cannot be melted by heating, its application field is extremely limited, such as being unable to perform processing such as injection molding by heating.

For the purpose of improving these moldability, a method of making polypyrrole finely dispersed in water and making an apparently uniform aqueous dispersion has been proposed. As this method, PVA which is a water-soluble polymer or an interface is proposed. There is a method for producing an aqueous dispersion of polypyrroles using an activator as a kind of dispersion stabilizer (for example, see Patent Document 1). In addition, a method of making a conductive sheet by mixing a hydrophilic binder resin with fine particles of polypyrroles dispersed in a hydrophilic solvent and coating the obtained resin composition on a substrate has also been proposed. As such, there are a conductive sheet and a manufacturing method thereof (for example, see Patent Document 2).
Japanese Patent Publication No. 7-78116 JP 2001-334598 A

  However, these conventional techniques still have some problems that cannot be solved. For example, in Patent Document 1, polypyrroles are dispersed in water, and pyrroles are polymerized in the presence of one or more surfactants selected from PVA or PVA and a nonionic surfactant or an anionic surfactant. There is disclosed a method for producing an aqueous dispersion of polypyrrole, which is characterized in that polypyrrole insoluble in water or a solvent is dispersed into a water-soluble polymer such as PVA, or a surfactant. This is based on the idea that the polymerized pyrroles are simply made into fine particles by reducing the interfacial tension due to the above.

PVA is mainly used as the water-soluble polymer used here, but the amount of PVA is 2 to 500% by mass, preferably 10 to 200% by mass, based on pyrrole. In the example, since a large amount of PVA is used for 50 to 200 parts by mass of pyrrole, the conductive dispersion obtained here is used when a thin film is applied on a film such as PET. A low resistance value cannot be obtained because the PVA is prevented from conducting.
Therefore, here, the obtained polypyrrole uniform aqueous dispersion is applied to a substrate and then dried to form a film, and the resistance value is measured. In order to form a polypyrrole-PVA composite film, it is several tens of μm or more. Therefore, there is no transparency at this thickness, and the resistance value of the black composite film is merely evaluated.
Furthermore, since the ionic conductivity due to the influence of moisture in the air is expressed by containing a large amount of water-soluble polymer PVA and surfactant, there is a drawback that the resistance value changes depending on humidity. It was.

  Patent Document 2 discloses that a resin sheet is used as a base material, polypyrrole fine particles are dispersed in a hydrophilic solvent using a polymer dispersant and / or a dopant on at least one surface of the base material, and a hydrophilic binder. A method of forming a conductive sheet by applying a resin composition mixed with a resin on the substrate and then removing the solvent by drying is disclosed. In this method, polypyrrole and / or polypyrrole derivative fine particles are dispersed in a hydrophilic solvent using a polymer dispersant and / or a dopant, and further mixed with a hydrophilic binder resin, and then applied onto a substrate. However, since the solvent is removed by drying, there are many steps up to coating, and productivity is lacking.

  As described above, in the conventional technology for obtaining a conductive polymer fine particle dispersion, there is not yet satisfactory in terms of long-term dispersion stability, transparency, and low resistance during thin film coating in the case of a conductive paint. It was. In addition, there are many steps when coating these dispersions, and productivity is lacking.

Accordingly, an object of the present invention is to provide a conductive coating that can be applied to a substrate, which can solve the above-mentioned problems, and a conductive polymer fine particle dispersion used in the conductive coating. ,
1) Excellent long-term storage stability
2) By applying to a substrate and drying, a conductive layer with excellent adhesion to the substrate can be easily formed,
3) The formed conductive layer can maintain high transparency with a thin film,
4) The conductive layer has high wear resistance,
5) Furthermore, a conductive paint having excellent characteristics such as being able to maintain a low resistance value without depending on humidity when applied, and a conductive polymer fine particle dispersion used for the conductive paint are provided extremely economically. There is to do.

As a result of intensive studies to solve the above problems, the present inventors have conducted chemical oxidative polymerization of a monomer that forms a conductive polymer in the presence of a reactive emulsifier in an aqueous system. In addition, water-soluble monomers and / or hydrophilic monomers copolymerizable with reactive emulsifiers are added to the system to conduct polymerization (chemical oxidative polymerization and radical polymerization). The inventors have found that a conductive polymer fine particle dispersion that can be obtained is obtained, and have reached the present invention.
That is, the present invention relates to a conductive polymer fine particle dispersion obtained by chemical oxidative polymerization of a monomer that forms a conductive polymer in water in the presence of a reactive emulsifier.
The present invention also relates to a conductive paint containing the conductive polymer fine particle dispersion.

A preferred embodiment of the present invention is:
The conductive polymer fine particle dispersion that performs radical polymerization simultaneously with the chemical oxidative polymerization,
The conductive polymer fine particle dispersion, wherein the monomer that forms the conductive polymer includes one or more selected from the group consisting of pyrrole, aniline, thiophene, and derivatives thereof,
The conductive polymer fine particle dispersion which is polymerized by further adding a water-soluble monomer copolymerizable with a reactive emulsifier,
The conductive polymer fine particle dispersion, wherein the surface of the polymer particles polymerized with the monomer forming the conductive polymer is coated with a polymer of a reactive emulsifier or is copolymerized with a reactive emulsifier and a reactive emulsifier. Conductive polymer fine particle dispersion coated with a polymer copolymerized with possible water-soluble monomer and / or hydrophilic monomer,
It is.

  The conductive polymer fine particle dispersion obtained by the present invention has significant characteristics in terms of particle size reduction, uniformity, and long-term stability in an aqueous system. In the conductive composite particles obtained by the conventional technique, particles settled due to gravity with time, and the dispersion stability decreased in a very short time. In addition, in the case of particles that seem to be finely dispersed, it is stable when left for several hours, but if left for longer than this, the particles gradually start to coalesce, and suddenly at a certain stage. A phenomenon of sedimentation was observed. Further, when coating a thin film, it is necessary to newly add a binder resin, leading to a decrease in transparency and a decrease in conductivity.

However, the conductive polymer fine particles of the present invention form uniform fine particles with a small particle diameter by strong adsorption to the surface of polymer particles obtained by polymerization of the monomer that forms the conductive polymer of the reactive emulsifier. In addition, the reactive emulsifier coats (attaches) in a form that protects the surface of the conductive polymer fine particles, so that it exhibits effective steric stabilization and electrostatic stabilization, despite the small addition amount. Thus, an aqueous dispersion having excellent long-term dispersion stability can be obtained. In addition, as described above, the reactive emulsifier is firmly adsorbed on the surface of the polymer particles, and exhibits the effective steric stabilizing action and electrostatic stabilizing action. When formed as, it will show high wear resistance.
Therefore, since the conductive paint of the present invention contains the above-described conductive polymer fine particle dispersion, it forms a coating film having high wear resistance in addition to the required conductivity and adhesion to the substrate. Can do.
In addition, when water-soluble monomers and / or hydrophilic monomers copolymerizable with reactive emulsifiers are added and polymerization (chemical oxidation polymerization and radical polymerization) is performed, the surface of the polymer particles is coated simultaneously with the formation of fine conductive polymer particles. Since the copolymer formed by (adhesion) acts as a binder that improves the adhesion to the substrate, a new binder resin is added to inhibit conductivity and reduce transparency. Therefore, a conductive layer having excellent adhesion and transparency and a low resistance value can be obtained.
In addition, the conductive layer is manufactured without using an excessive water-soluble polymer or surfactant that causes the humidity dependency of the resistance value of the conductive fine particles, so that the resistance value does not depend on humidity. .
Furthermore, since it is not necessary to newly select a binder that does not impair the dispersion of the conductive fine particles and there is no step of adding the binder, it is simplified and the productivity is improved, which is extremely economical.

好ましい化合物としては、ｎが１０、ＭがＳＯ₃ＮＨ₄である式（Ｂ）で表される化合物、ｍ≒１２である式（Ｃ）で表される化合物及び（Ｅ）で表される化合物が挙げられる。 The present invention will be described in more detail.
The reactive emulsifier used in the present invention is an emulsifier having a polymerizable substituent, and examples of the polymerizable substituent include a substituent having a double bond.
Specific examples of the reactive emulsifier used in the present invention include those containing a compound having a structure represented by the following formula (A) to formula (F).

Preferable compounds include a compound represented by the formula (B) in which n is 10 and M is SO ₃ NH ₄ , a compound represented by the formula (C) in which m≈12, and a compound represented by (E) Is mentioned.

  The usage-amount of a reactive emulsifier is the range of 1-500 mass% with respect to the usage-amount of the monomer which forms a conductive polymer, Preferably it is the range of 5-300 mass%.

The reactive emulsifier can be used alone, but more preferably, a water-soluble monomer and / or a hydrophilic monomer copolymerizable with the reactive emulsifier and a radical initiator are allowed to coexist in the reaction system. And a reactive emulsifier and the water-soluble monomer and / or hydrophilic monomer are also known. The copolymer keeps the dispersibility of the conductive polymer fine particles stable and at the same time serves as a binder. This makes it possible to improve the adhesion to the substrate.
The monomer copolymerizable with the reactive emulsifier is not particularly limited as long as it is a water-soluble and hydrophilic radically polymerizable monomer, and examples thereof include acrylic monomers and vinyl monomers, and acrylonitrile and acrylic monomers are particularly preferable. Examples include acid, methacrylic acid, N-vinylpyrrolidone, acrylamide, methacrylamide, methyl acrylate, ethyl acrylate, and methyl methacrylate.

As a monomer that forms a conductive polymer that can be used in the present invention, pyrrole, aniline,
One or more selected from the group consisting of thiophene and derivatives thereof.

For example, as pyrrole derivatives, N-methylpyrrole, N-ethylpyrrole, N-phenylpyrrole, N-naphthylpyrrole, N-methyl-3-methylpyrrole, N-methyl-3-ethylpyrrole, N-phenyl-3 -Methylpyrrole, N-phenyl-3-ethylpyrrole, 3-methylpyrrole, 3-ethylpyrrole, 3-n-butylpyrrole, 3-methoxypyrrole, 3-ethoxypyrrole, 3-n-propoxypyrrole, 3-n -Butoxypyrrole, 3-phenylpyrrole, 3-toluylpyrrole, 3-naphthylpyrrole, 3-phenoxypyrrole, 3-methylphenoxypyrrole, 3-aminopyrrole, 3-dimethylaminopyrrole, 3-diethylaminopyrrole, 3-diphenylamino Pyrrole, 3-methylphenylaminopyrrole , 3-phenylnaphthylaminopyrrole and the like. As aniline derivatives, o-methylaniline, m-methylaniline, o-ethylaniline, m-ethylaniline, o-ethoxyaniline, m-butylaniline, m-hexylaniline, m-octylaniline, 2,3 -Dimethylaniline, 2,5-dimethylaniline, 2,5-dimethoxyaniline, o-cyanoaniline, 2,5-dichloroaniline, 2-bromoaniline, 5-chloro-2-methoxyaniline, 3-phenoxyaniline, etc. Raised. As thiophene derivatives, 3-methylthiophene, 3,4-dimethylthiophene, 3-hexylthiophene, 3-stearylthiophene, 3-bromothiophene, 3-methoxydiethoxymethylthiophene, 3-phenylthiophene, 3-benzyl Examples include thiophene and 3-methyl-4-phenylthiophene. Preferable examples include pyrrole, thiophene, and aniline, and particularly preferable examples include pyrrole.

  Further, the concentration of the monomer that forms the conductive polymer in the aqueous solution used during the chemical oxidative polymerization of the monomer that forms the conductive polymer is preferably in the range of 0.01 to 5% by mass, and more preferably 0.1%. To 2% by mass.

  The oxidizing agent used in the present invention as a catalyst for chemical oxidative polymerization is not particularly limited as long as it can chemically oxidize pyrrole, aniline, thiophene and their derivatives. For example, sulfuric acid, hydrochloric acid, nitric acid and Inorganic acids such as chlorosulfonic acid, organic acids such as alkylbenzenesulfonic acid and alkylnaphthalenesulfonic acid, peroxides such as potassium persulfate, ammonium persulfate, sodium persulfate and hydrogen peroxide, ferric chloride, chloride Metal halides such as aluminum, halogen acids such as iodic acid and potassium perchlorate and salts thereof, transition metal compounds such as potassium permanganate, and the like can be used. These may be used alone or in combination.

  Preferred oxidizing agents also have activity as radical initiators, so that a monomer that forms a conductive polymer is oxidatively polymerized, and at the same time, a reactive emulsifier and a water-soluble monomer copolymerizable with the reactive emulsifier and / or Examples thereof include persulfates such as potassium persulfate, ammonium persulfate and sodium persulfate, which can copolymerize (radical polymerization) a hydrophilic monomer.

  Moreover, in addition to the oxidizing agent mentioned above, a radical initiator can also be added. Examples of the radical initiator include 2,2′-azobis (2-amidinopropane) dihydrochloride, 4,4 '-Azobis (4-cyanovaleric acid), azobisisobutyronitrile (AIBN), benzoyl peroxide (BPO) and the like can be mentioned.

The amount of the oxidizing agent to be used is about 0.01 to 7 mol, preferably about 0.1 to 4 mol, with respect to 1 mol of the monomer forming the conductive polymer.
Examples of the usage amount when using the radical initiator include the same usage amount as that of the oxidizing agent.

  In addition to the above, a doped polymer can be obtained by allowing a doping agent (dopant) to coexist during polymerization. In the present invention, a part of the oxidizing agent may be taken into the conductive polymer fine particles to serve as a dopant that makes the conductive polymer fine particles have a lower resistance. Is also possible. As a dopant to be used, all acceptor dopants generally used can be used. Acceptable dopants include halogens such as chlorine, bromine and iodine, Lewis acids such as phosphorus pentafluoride, proton acids such as hydrogen chloride and sulfuric acid, transition metal chlorides such as ferric chloride, and perchloric acid Examples thereof include transition metal compounds such as silver and silver boron fluoride.

The method for producing a conductive polymer fine particle dispersion is performed, for example, in the following steps:
(A) a monomer that forms a conductive polymer in water (for example, ion-exchanged water), a reactive emulsifier, and optionally a water-soluble monomer and / or hydrophilic monomer copolymerizable with the reactive emulsifier, and optionally a dopant. Adding and mixing and stirring,
(B) Addition of an oxidizing agent and, if desired, a radical initiator to the aqueous solution prepared as described above, and heating, if desired, chemical oxidative polymerization (in some cases, chemical oxidative polymerization and radical polymerization) to disperse conductive polymer fine particles The process of manufacturing the body.

  Each of the above steps can be performed using means known to those skilled in the art. For example, the mixing and stirring is not particularly limited. For example, a magnetic stirrer, a stirrer, a homogenizer, or the like can be selected as appropriate, and chemical oxidation polymerization can be performed under ultrasonic irradiation.

  The conductive polymer fine particles obtained by the above production method are mainly coated with the polymer of the reactive emulsifier on the surface of the polymer particle obtained by polymerizing the monomer forming the conductive polymer, or reactive with the reactive emulsifier. Fine particles coated with a polymer copolymerized with a water-soluble monomer and / or a hydrophilic monomer copolymerizable with an emulsifier. And its features are fine particle size (average particle size is less than 0.5μm), dispersible stably in water for a long time, and excellent adhesion and high wear resistance when formed as a conductive layer It is to show.

The conductive polymer fine particle dispersion obtained above can be used as a conductive paint as it is.
Moreover, a binder etc. can be added as needed and it can also be used as an electroconductive coating material. Examples of the binder used include polyvinyl chloride, polycarbonate, polystyrene, polymethyl methacrylate, polyester, polysulfone, polyphenylene oxide, polybutadiene, poly (N-vinylcarbazole), hydrocarbon resin, ketone resin, phenoxy resin, and polyamide. , Ethyl cellulose, vinyl acetate, ABS resin, polyurethane resin, melamine resin, unsaturated polyester resin, alkyd resin, epoxy resin, silicon resin and the like.
The conductive paint obtained by the method described above is coated on a base material by a conventional method, heated as necessary, and dried to easily form a conductive layer on the base material. Can do.
Therefore, the conductive polymer fine particle dispersion obtained by the production method of the present invention includes a conductive paint, a rust preventive paint, a semiconductor material, an electrolyte for a capacitor, a hole transport material for an organic EL element, and an electrode material for a secondary battery. Useful as.

The conductive polymer fine particle aqueous dispersion obtained in the present invention can stably maintain a dispersed state for a long period of time, and the particle size does not change with time. And when formed as a conductive layer, it exhibits high wear resistance. Further, in the case of chemical oxidative polymerization (in some cases, chemical oxidative polymerization and radical polymerization), it is possible to further improve the conductive performance by allowing a dopant to coexist. Furthermore, when the conductive polymer fine particle aqueous dispersion is coated on the base material, the polymer copolymerized with the reactive emulsifier acts as a binder for improving the adhesion to the base material, thereby adding a separate binder. Therefore, it is possible to obtain a conductive thin film having excellent adhesion and transparency and having a low resistance value.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited at all by these Examples.
The trade names and chemical structures of the reactive emulsifiers (reactive emulsifiers A to C) used in the examples are shown in Table 1.
Table 1

Example 1
To 40 g of ion-exchanged water, 65 mg of pyrrole and 0.15 g of reactive emulsifier A were added and stirred for 10 minutes, 10 mL of ammonium persulfate (0.19M) was added, and a polymerization reaction was performed at a reaction temperature of 60 ° C. for 24 hours. An aqueous dispersion of black conductive polymer fine particles was obtained.

Example 2
40 mg of acrylonitrile is dissolved in 20 g of ion-exchanged water, 65 mg of pyrrole and 0.15 g of reactive emulsifier A are dissolved in 10 g of ion-exchanged water, and 10 mL of ammonium persulfate (0.19M) is added. The polymerization reaction was carried out at a reaction temperature of 60 ° C. for 24 hours. An aqueous dispersion of black conductive polymer fine particles was obtained.

Example 3
Add 65 mg of pyrrole and 0.375 g of reactive emulsifier B (active ingredient 0.15 g) to 40 g of ion-exchanged water, stir for 10 minutes, add 10 mL of ammonium persulfate (0.19M), and react at a reaction temperature of 60 ° C. for 24 hours. A polymerization reaction was performed. An aqueous dispersion of black conductive polymer fine particles was obtained.

Example 4
65 mg of pyrrole and 0.15 g of reactive emulsifier A were added to 40 g of ion-exchanged water, stirred for 10 minutes, 10 mL of ammonium persulfate (0.19M) was added, and a polymerization reaction was performed at a reaction temperature of 25 ° C. for 24 hours. An aqueous dispersion of black conductive polymer fine particles was obtained.

Example 5
The same procedure as in Example 1 was performed except that aniline was used as the monomer for forming the conductive polymer.

Example 6
40 mg of acrylonitrile is dissolved in 20 g of ion-exchanged water, and 65 mg of pyrrole and 0.167 g of reactive emulsifier C (active ingredient 0.15 g) are added to 10 g of ion-exchanged water, and ammonium persulfate (0. 19M) 10 mL was added, and a polymerization reaction was performed at a reaction temperature of 60 ° C. for 24 hours. A black conductive fine particle aqueous dispersion was obtained.

Comparative Example 1
The same procedure as in Example 1 was conducted except that no reactive emulsifier was added. An aggregate of polypyrrole was obtained and was not dispersed in an aqueous solution, and a conductive thin film could not be prepared.

Comparative Example 2
The same procedure as in Example 1 was performed except that 0.15 g of sodium dodecyl sulfate was used instead of the reactive emulsifier.

Comparative Example 3
It carried out similarly to Example 1 except having used 0.65g (solid content 32.5mg) of polyvinyl alcohol (complete saponification type, polymerization degree 1700, 5% aqueous solution) instead of the reactive emulsifier. An aggregate of polypyrrole was obtained and was not dispersed in an aqueous solution, and a conductive thin film could not be prepared.

Test example 1
For the conductive polymer fine particles obtained in Examples 1 to 6 and Comparative Examples 1 to 3, the average particle size and the total uniformity coefficient were measured for particle size distribution by Microtrac Nanotrac UPA-EX150 (manufactured by Nikkiso Co., Ltd.) (monodisperse mode) ) From this particle size distribution, the cumulative curve was determined with the total volume being 100%, and the particle size at which the cumulative curve was 50% was taken as the average particle size. Further, a value obtained by dividing 60% particle size (d60%) by 10% particle size (d10%) (d60% / d10%) and 90% particle size (d90%) are 40% particle size ( The value obtained by adding (d90% / d40%) divided by (d40%) ((d60% / d10%) + (d90% / d40%)) was defined as the total uniformity coefficient. Therefore, as (d60% / d10%) and (d90% / d40%) are closer to 1.0, respectively, ((d60% / d10%) + (d90% / d40%)) is closer to 2.0. It shows that the particle size distribution width becomes narrower. The results are shown in Table 2.

Test example 2
Evaluation of the dispersion stability of the conductive polymer fine particle dispersions obtained in Examples 1 to 6 and Comparative Examples 1 to 3 was performed using a centrifugal automatic particle size distribution analyzer CAPA-500 (manufactured by Horiba, Ltd.). Evaluation was made from the change in relative absorbance with time under centrifugation at 5000 rpm. Table 2 shows the relative absorbance after centrifugation for 10 minutes.
Table 2

Test example 3
The surface resistance value (Ω) of the conductive thin film obtained by uniformly applying the conductive polymer fine particle dispersions obtained in Examples 1 to 6 and Comparative Examples 1 to 3 using a bar coater # 8 and drying them. Was measured using a Hiresta resistance meter and a Loresta resistance meter (each manufactured by Mitsubishi Chemical Corporation). The measurement results at a humidity of 50% are shown in Table 3.

Test example 4
The light transmittance (transparency,%) of the conductive thin films of Examples 1 to 6 and Comparative Examples 1 to 3 was 550 nm using a spectrophotometer (manufactured by JASCO Corporation) as a reference with the base substrate as a reference. It was measured. The results are shown in Table 3.

Test Example 5
Evaluation of adhesion of the conductive thin films of Examples 1 to 6 and Comparative Examples 1 to 3 was performed according to JISK5600-5-6. Evaluation criteria were classified into 0-5. The results are shown in Table 3.

Test Example 6
The abrasion resistance of the conductive thin films of Examples 1 to 6 and Comparative Examples 1 to 3 was evaluated by conducting a friction test according to JISL0849, and regarding abrasion resistance under dry and wet conditions based on JISL0801, starting from grade 5 in order of goodness. Classified to the first grade. The results are shown in Table 3.

Test Example 7
About the humidity dependence of the electroconductive thin film of Examples 1-6 and Comparative Examples 1-3, the surface resistance value was measured in the environment of humidity 10, 50, and 90%, and the change of the surface resistance value was investigated. When the humidity was 10% to 90%, the change in resistance value was “none” when less than one digit, and “yes” when more than one digit. The results are shown in Table 3.
Table 3

Claims (6)

A conductive polymer fine particle dispersion obtained by chemical oxidative polymerization of a monomer that forms a conductive polymer in water in the presence of a reactive emulsifier. The conductive polymer fine particle dispersion according to claim 1, wherein radical polymerization is performed simultaneously with the chemical oxidative polymerization. The conductive polymer fine particle dispersion according to claim 1, wherein the monomer that forms the conductive polymer includes one or more selected from the group consisting of pyrrole, aniline, thiophene, and derivatives thereof. The conductive polymer fine particle dispersion according to any one of claims 1 to 3, which is polymerized by further adding a water-soluble monomer and / or a hydrophilic monomer copolymerizable with a reactive emulsifier. The conductive polymer fine particle dispersion according to any one of claims 1 to 4, wherein the surface of the polymer particle obtained by polymerizing the monomer forming the conductive polymer is coated with a polymer of a reactive emulsifier. A conductive polymer fine particle dispersion coated with a polymer copolymerized with a water-soluble monomer and / or a hydrophilic monomer copolymerizable with a reactive emulsifier and a reactive emulsifier. A conductive paint containing the conductive polymer fine particle dispersion according to any one of claims 1 to 5.