JP2009073921A - Conductive polymer solution and conductive coating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive coating film which is capable of retaining a stable solution state, has excellent film forming property and conductivity, and does not increase its surface resistance even when exposed to visible light or UV radiation for a long time, and to provide an electroconductive polymer solution which can form such an electroconductive coating film. <P>SOLUTION: The conductive polymer solution contains a conductive polymer with a π-conjugated system, a solubilized polymer, a specific hydroxyphenyl acrylic compound, and a solvent. The conductive coating film is formed by coating the conductive polymer solution. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a conductive polymer solution containing a π-conjugated conductive polymer and a conductive coating film.

Generally, a π-conjugated conductive polymer whose main chain is composed of a conjugated system containing π electrons is synthesized by an electrolytic polymerization method and a chemical oxidative polymerization method.
In the electropolymerization method, a support such as a previously formed electrode material is immersed in a mixed solution of an electrolyte serving as a dopant and a precursor monomer that forms a π-conjugated conductive polymer, and the π-conjugated system is formed on the support. A conductive polymer is formed into a film. Therefore, it is difficult to manufacture in large quantities.
On the other hand, in the chemical oxidation polymerization method, there is no such limitation, an oxidizing agent and an oxidation polymerization catalyst are added to the precursor monomer of the π-conjugated conductive polymer, and a large amount of π-conjugated conductive polymer is added in the solution. Can be manufactured.
However, in the chemical oxidative polymerization method, as the conjugated system of the π-conjugated conductive polymer main chain grows, the solubility in a solvent becomes poor, so that an insoluble solid powder can be obtained. If it is insoluble, it becomes difficult to form a π-conjugated conductive polymer film uniformly on the support surface.

Therefore, a method of introducing a functional group into a π-conjugated conductive polymer and solubilizing, a method of dispersing and solubilizing in a binder, and a method of solubilizing by adding an anionic group-containing polymer acid have been tried. .
For example, in order to improve the dispersibility in water, an oxidizing agent is used in the presence of polystyrenesulfonic acid, which is an anion group-containing polymer acid having a molecular weight in the range of 2,000 to 500,000, and 3, 4 -A method of producing a poly (3,4-dialkoxythiophene) aqueous solution by chemical oxidative polymerization of dialkoxythiophene has been proposed (see Patent Document 1). In addition, a method of producing a π-conjugated conductive polymer colloid aqueous solution by chemical oxidative polymerization in the presence of polyacrylic acid has been proposed (see Patent Document 2).

  According to the methods described in Patent Documents 1 and 2, an aqueous dispersion containing a π-conjugated conductive polymer can be easily produced. However, in these methods, in order to ensure the dispersibility of the π-conjugated conductive polymer in water, it is necessary to contain a large amount of the anionic group-containing polymer acid. For this reason, the conductive coating film formed from the solution contains many compounds that do not contribute to conductivity, and there is a problem that high conductivity is difficult to obtain.

  In addition, in the chemical oxidative polymerization method, an undesirable side reaction may occur due to an oxidizing agent having a high oxidizing power during chemical oxidative polymerization. Since it was oxidized, it included a factor that lowers the conductivity of the obtained π-conjugated conductive polymer. In order to solve the problem, a method using a transition metal ion as a catalyst, a method of reacting at a low temperature for a long time, or the like may be employed. However, in these methods, the generated polymer causes a decrease in the structural regularity of the π-conjugated conductive polymer caused by protons generated by the dehydrogenation of the monomer, so that the decrease in conductivity is sufficiently prevented. I couldn't.

Furthermore, the conductive coating film formed by applying the π-conjugated conductive polymer obtained by these methods has a problem that the surface resistance greatly increases when exposed to visible light or ultraviolet light for a long time. It was.
Thus, a method has been proposed in which polyphosphoric acid or the like is added to suppress an increase in surface resistance when exposed to visible light or ultraviolet light for a long time (see Patent Document 3).
Japanese Patent No. 2636968 Japanese Patent Laid-Open No. 7-165892 JP-T-2006-505099

However, even the method described in Patent Document 3 cannot sufficiently suppress the increase in surface resistance, and when polyphosphoric acid is added, there is a problem in that the stability of the conductive polymer solution is significantly reduced. .
Moreover, as a method for suppressing an increase in surface resistance when the conductive coating film is exposed to visible light and ultraviolet light for a long time, a method using an ultraviolet absorber or an antioxidant can be considered. Has no film formability. For this reason, it may be difficult to form a coating film, the strength of the coating film may be reduced, or the ultraviolet absorber or the antioxidant may bleed out when stored for a long time.

  The present invention has been made in view of the above problems, can ensure a stable solution state, has excellent film formability, has high conductivity, and can be exposed to visible light or ultraviolet light for a long time. An object of the present invention is to provide a conductive polymer solution capable of forming a conductive coating film whose resistance is hardly increased. It is another object of the present invention to provide a conductive coating film that has high conductivity and does not easily increase surface resistance even when exposed to visible light or ultraviolet light for a long time.

The present invention includes the following aspects.
[1] A conductive material comprising a π-conjugated conductive polymer, a solubilized polymer, a hydroxyphenyl acrylic compound represented by the following chemical formula (1) or the following chemical formula (2), and a solvent. Polymer solution.
(X in the chemical formula (1) represents NH or O, Y represents a hydrogen atom or a methyl group. Further, m ₁ and n ₁ in the chemical formula (1) are each independently any one of 1 to 5 It is an integer (where m ₁ + n ₁ is 2 to 6.) R in chemical formula (2) represents a hydrogen atom or an arbitrary substituent, and m ₂ and n ₂ in chemical formula (2) are each independent. Any integer of 1 to 5 (where m ₂ + n ₂ is 2 to 6).

[2] The conductive polymer solution according to [1], wherein the hydroxyphenylacrylic compound represented by the chemical formula (1) is a compound represented by the following chemical formula (3).
(X in chemical formula (3) represents NH or O, and Y represents a hydrogen atom or a methyl group. In chemical formula (3), part or all of the hydrogen atoms in the aromatic ring are substituted with hydroxy groups. May be.)

[3] The conductive polymer solution according to [1], wherein the hydroxyphenylacrylic compound represented by the chemical formula (2) is a compound represented by the following chemical formula (4).
(R in the chemical formula (4) represents a hydrogen atom or an arbitrary substituent. In the chemical formula (4), part or all of the hydrogen atoms of the aromatic ring may be substituted with a hydroxy group.)

[4] The conductive polymer solution according to any one of [1] to [3], further including a binder.
[5] A conductive coating film formed by applying the conductive polymer solution according to any one of [1] to [4].

The conductive polymer solution of the present invention can ensure a stable solution state, is excellent in film formability, has high conductivity, and does not easily increase surface resistance even when exposed to visible light or ultraviolet light for a long time. A conductive coating film can be formed.
The conductive coating film of the present invention has high conductivity, and the surface resistance hardly increases even when exposed to visible light or ultraviolet light for a long time.

<Conductive polymer solution>
The conductive polymer solution of the present invention contains a π-conjugated conductive polymer, a solubilized polymer, a hydroxyphenylacryl compound, and a solvent.

(Π-conjugated conductive polymer)
The π-conjugated conductive polymer can be used as long as the main chain is an organic polymer having a π-conjugated system. Examples thereof include polypyrroles, polythiophenes, polyacetylenes, polyphenylenes, polyphenylene vinylenes, polyanilines, polyacenes, polythiophene vinylenes, and copolymers thereof. From the viewpoint of easy polymerization and stability in air, polypyrroles, polythiophenes and polyanilines are preferred.
Even if the π-conjugated conductive polymer remains unsubstituted, sufficient conductivity and compatibility with the binder can be obtained, but in order to further improve conductivity and dispersibility or solubility in the binder, It is preferable to introduce a functional group such as a group, a carboxy group, a sulfo group, an alkoxy group, a hydroxy group, or a cyano group into the π-conjugated conductive polymer.

  Specific examples of such π-conjugated conductive polymers include polypyrrole, poly (N-methylpyrrole), poly (3-methylpyrrole), poly (3-ethylpyrrole), and poly (3-n-propylpyrrole). ), Poly (3-butylpyrrole), poly (3-octylpyrrole), poly (3-decylpyrrole), poly (3-dodecylpyrrole), poly (3,4-dimethylpyrrole), poly (3,4 Dibutylpyrrole), poly (3-carboxypyrrole), poly (3-methyl-4-carboxypyrrole), poly (3-methyl-4-carboxyethylpyrrole), poly (3-methyl-4-carboxybutylpyrrole), Poly (3-hydroxypyrrole), poly (3-methoxypyrrole), poly (3-ethoxypyrrole), poly (3-butoxypyrrole), poly 3-hexyloxypyrrole), poly (3-methyl-4-hexyloxypyrrole), poly (3-methyl-4-hexyloxypyrrole), poly (thiophene), poly (3-methylthiophene), poly (3- Ethylthiophene), poly (3-propylthiophene), poly (3-butylthiophene), poly (3-hexylthiophene), poly (3-heptylthiophene), poly (3-octylthiophene), poly (3-decylthiophene) ), Poly (3-dodecylthiophene), poly (3-octadecylthiophene), poly (3-bromothiophene), poly (3-chlorothiophene), poly (3-iodothiophene), poly (3-cyanothiophene), Poly (3-phenylthiophene), poly (3,4-dimethylthiophene), poly (3,4-di Butylthiophene), poly (3-hydroxythiophene), poly (3-methoxythiophene), poly (3-ethoxythiophene), poly (3-butoxythiophene), poly (3-hexyloxythiophene), poly (3-heptyl) Oxythiophene), poly (3-octyloxythiophene), poly (3-decyloxythiophene), poly (3-dodecyloxythiophene), poly (3-octadecyloxythiophene), poly (3,4-dihydroxythiophene), Poly (3,4-dimethoxythiophene), poly (3,4-diethoxythiophene), poly (3,4-dipropoxythiophene), poly (3,4-dibutoxythiophene), poly (3,4-dihexyl) Oxythiophene), poly (3,4-diheptyloxythiophene), poly 3,4-dioctyloxythiophene), poly (3,4-didecyloxythiophene), poly (3,4-didodecyloxythiophene), poly (3,4-ethylenedioxythiophene), poly (3,4 -Propylene dioxythiophene), poly (3,4-butenedioxythiophene), poly (3-methyl-4-methoxythiophene), poly (3-methyl-4-ethoxythiophene), poly (3-carboxythiophene) , Poly (3-methyl-4-carboxythiophene), poly (3-methyl-4-carboxyethylthiophene), poly (3-methyl-4-carboxybutylthiophene), polyaniline, poly (2-methylaniline), poly (3-isobutylaniline), poly (2-anilinesulfonic acid), poly (3-anilinesulfonic acid) And the like.

Among them, from one or two kinds selected from polypyrrole, polythiophene, poly (N-methylpyrrole), poly (3-methylthiophene), poly (3-methoxythiophene), and poly (3,4-ethylenedioxythiophene). The (co) polymer is preferably used from the viewpoints of resistance and reactivity. Furthermore, polypyrrole and poly (3,4-ethylenedioxythiophene) are more preferable because they have higher conductivity and improved heat resistance.
In addition, alkyl-substituted compounds such as poly (N-methylpyrrole) and poly (3-methylthiophene) are more preferable because they improve solvent solubility, compatibility with the binder, and dispersibility. Among the alkyl groups, a methyl group is preferred because it does not adversely affect the conductivity.

(Solubilized polymer)
The solubilized polymer is a polymer that solubilizes the π-conjugated conductive polymer, and examples of the solubilized polymer include polymers having an anion group and / or an electron withdrawing group.

[Polymer having anionic group]
Polymers having an anionic group (hereinafter referred to as polyanions) are substituted or unsubstituted polyalkylene, substituted or unsubstituted polyalkenylene, substituted or unsubstituted polyimide, substituted or unsubstituted polyamide, substituted or unsubstituted Polyester and copolymers thereof, which are composed of a structural unit having an anionic group and a structural unit having no anionic group.
The anion group of the polyanion functions as a dopant for the π-conjugated conductive polymer, and improves the conductivity and heat resistance of the π-conjugated conductive polymer.

  A polyalkylene is a polymer whose main chain is composed of repeating methylenes. Examples of the polyalkylene include polyethylene, polypropylene, polybutene, polypentene, polyhexene, polyvinyl alcohol, polyvinylphenol, poly (3,3,3-trifluoropropylene), polyacrylonitrile, polyacrylate, polystyrene, and the like.

Polyalkenylene is a polymer composed of structural units containing one or more unsaturated bonds (vinyl groups) in the main chain. Specific examples of polyalkenylene include propenylene, 1-methylpropenylene, 1-butylpropenylene, 1-decylpropenylene, 1-cyanopropenylene, 1-phenylpropenylene, 1-hydroxypropenylene, 1-butenylene, 1-methyl-1-butenylene, 1-ethyl-1-butenylene, 1-octyl-1-butenylene, 1-pentadecyl-1-butenylene, 2-methyl-1-butenylene, 2-ethyl-1-butenylene, 2- Butyl-1-butenylene, 2-hexyl-1-butenylene, 2-octyl-1-butenylene, 2-decyl-1-butenylene, 2-dodecyl-1-butenylene, 2-phenyl-1-butenylene, 2-butenylene, 1-methyl-2-butenylene, 1-ethyl-2-butenylene, 1-octyl-2-butenylene 1-pentadecyl-2-butenylene, 2-methyl-2-butenylene, 2-ethyl-2-butenylene, 2-butyl-2-butenylene, 2-hexyl-2-butenylene, 2-octyl-2-butenylene, 2- Decyl-2-butenylene, 2-dodecyl-2-butenylene, 2-phenyl-2-butenylene, 2-propylenephenyl-2-butenylene, 3-methyl-2-butenylene, 3-ethyl-2-butenylene, 3-butyl 2-butenylene, 3-hexyl-2-butenylene, 3-octyl-2-butenylene, 3-decyl-2-butenylene, 3-dodecyl-2-butenylene, 3-phenyl-2-butenylene, 3-propylenephenyl- 2-butenylene, 2-pentenylene, 4-propyl-2-pentenylene, 4-butyl-2-pentenylene, 4-he Selected from sil-2-pentenylene, 4-cyano-2-pentenylene, 3-methyl-2-pentenylene, 4-ethyl-2-pentenylene, 3-phenyl-2-pentenylene, 4-hydroxy-2-pentenylene, hexenylene, etc. And a polymer containing one or more structural units.
Among these, substituted or unsubstituted butenylene is preferable because of the interaction between the unsaturated bond and the π-conjugated conductive polymer and the ease of synthesis using substituted or unsubstituted butadiene as a starting material.

Examples of polyimide include pyromellitic dianhydride, biphenyltetracarboxylic dianhydride, benzophenonetetracarboxylic dianhydride, 2,2,3,3-tetracarboxydiphenyl ether dianhydride, 2,2- [4,4 Examples include polyimides from anhydrides such as' -di (dicarboxyphenyloxy) phenyl] propane dianhydride and diamines such as oxydianine, paraphenylenediamine, metaphenylenediamine, and benzophenonediamine.
Examples of the polyamide include polyamide 6, polyamide 6,6, polyamide 6,10 and the like.
Examples of the polyester include polyethylene terephthalate and polybutylene terephthalate.

When the polyanion has a substituent, examples of the substituent include an alkyl group, a hydroxy group, an amino group, a carboxy group, a cyano group, a phenyl group, a phenol group, an ester group, and an alkoxy group. In view of solubility in a solvent, heat resistance, compatibility with a resin, and the like, an alkyl group, a hydroxy group, a phenol group, and an ester group are preferable.
Alkyl groups can increase solubility and dispersibility in polar or nonpolar solvents, compatibility and dispersibility in resins, and hydroxy groups form hydrogen bonds with other hydrogen atoms. This makes it easy to increase solubility in organic solvents, compatibility with resins, dispersibility, and adhesion. In addition, the cyano group and the hydroxyphenyl group can increase the compatibility and solubility in the polar resin, and can also increase the heat resistance.
Among the above substituents, an alkyl group, a hydroxy group, an ester group, and a cyano group are preferable.

Examples of the alkyl group include chain alkyl groups such as methyl, ethyl, propyl, butyl, isobutyl, t-butyl, pentyl, hexyl, octyl, decyl, and dodecyl, and cycloalkyl groups such as cyclopropyl, cyclopentyl, and cyclohexyl. . In consideration of solubility in an organic solvent, dispersibility in a resin, steric hindrance, and the like, an alkyl group having 1 to 12 carbon atoms is more preferable.
Examples of the hydroxy group include a hydroxy group directly bonded to the main chain of the polyanion or a hydroxy group bonded via another functional group. Examples of other functional groups include an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an amide group, and an imide group. The hydroxy group is substituted at the end or in these functional groups. Among these, a hydroxy group bonded to the terminal of an alkyl group having 1 to 6 carbon atoms bonded to the main chain is more preferable from the viewpoint of compatibility with a resin and solubility in an organic solvent.
Examples of the amino group include an amino group directly bonded to the main chain of the polyanion or an amino group bonded via another functional group. Examples of other functional groups include an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an amide group, and an imide group. The amino group is substituted at the end or in these functional groups.
Examples of the phenol group include a phenol group directly bonded to the main chain of the polyanion or a phenol group bonded via another functional group. Examples of other functional groups include an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, an amide group, and an imide group. The phenol group is substituted at the end or in these functional groups.
Examples of the ester group include an alkyl ester group directly bonded to the main chain of the polyanion, an aromatic ester group, and an alkyl ester group or an aromatic ester group having another functional group interposed therebetween.
The cyano group includes a cyano group directly bonded to the main chain of the polyanion, a cyano group bonded to the terminal of the alkyl group having 1 to 7 carbon atoms bonded to the main chain of the polyanion, and 2 to 2 carbon atoms bonded to the main chain of the polyanion. And a cyano group bonded to the terminal of 7 alkenyl group.

  The anion group of the polyanion may be a functional group capable of undergoing chemical oxidation doping to the π-conjugated conductive polymer. Among them, from the viewpoint of ease of production and stability, a monosubstituted sulfate group, A monosubstituted phosphate group, a phosphate group, a carboxy group, a sulfo group and the like are preferable. Furthermore, from the viewpoint of the doping effect of the functional group on the π-conjugated conductive polymer, a sulfo group, a monosubstituted sulfate group, and a carboxy group are more preferable.

Specific examples of polyanions include polyvinyl sulfonic acid, polystyrene sulfonic acid, polyallyl sulfonic acid, polyacryl sulfonic acid, polymethacryl sulfonic acid, poly (2-acrylamido-2-methylpropane sulfonic acid), polyisoprene sulfonic acid, polyvinyl Examples thereof include carboxylic acid, polystyrene carboxylic acid, polyallyl carboxylic acid, polyacryl carboxylic acid, polymethacryl carboxylic acid, poly (2-acrylamido-2-methylpropane carboxylic acid), polyisoprene carboxylic acid, polyacrylic acid and the like. These homopolymers may be sufficient and 2 or more types of copolymers may be sufficient.
Of these, polyacrylsulfonic acid and polymethacrylsulfonic acid are preferred. Polyacrylsulfonic acid and polymethacrylsulfonic acid are excellent in heat resistance and environmental resistance because thermal decomposition of the π-conjugated conductive polymer component is relaxed by absorbing thermal energy and decomposing by itself. Furthermore, since it has an ester group, it is excellent in compatibility with the binder and dispersibility.

  The degree of polymerization of the polyanion is preferably in the range of 10 to 100,000 monomer units, and more preferably in the range of 50 to 10,000 from the viewpoint of solvent solubility and conductivity.

[Polymer having electron withdrawing group]
The polymer having an electron withdrawing group includes, for example, a polymer having as a structural unit a compound having at least one selected from a cyano group, a nitro group, a formyl group, a carbonyl group, and an acetyl group. Among these, a cyano group is preferable because it has high polarity and can solubilize a π-conjugated conductive polymer. Moreover, since compatibility with a binder and dispersibility can be made higher, it is preferable.
Specific examples of the polymer having an electron withdrawing group include polyacrylonitrile, polymethacrylonitrile, acrylonitrile-styrene resin, acrylonitrile-butadiene resin, acrylonitrile-butadiene-styrene resin, and a resin obtained by cyanoethylating a hydroxyl group or amino group-containing resin. (For example, cyanoethyl cellulose), polyvinyl pyrrolidone, alkylated polyvinyl pyrrolidone, nitrocellulose and the like.

  The solubilized polymer may be added with a synthetic rubber for improving impact resistance, an anti-aging agent, an antioxidant, or an ultraviolet absorber for improving environmental resistance. However, amine compound antioxidants may interfere with the action of the oxidizer used when polymerizing the above conductive polymer, so the antioxidant may be phenolic or mixed after polymerization. It is necessary to take measures such as

  The content of the solubilized polymer is preferably in the range of 0.1 to 10 mol, more preferably in the range of 1 to 7 mol, with respect to 1 mol of the π-conjugated conductive polymer. When the content of the solubilized polymer is less than 0.1 mol, the doping effect on the π-conjugated conductive polymer tends to be weak, and the conductivity may be insufficient. In addition, the dispersibility and solubility in the solvent are reduced, making it difficult to obtain a uniform dispersion. On the other hand, when the content of the solubilized polymer is more than 10 mol, the content ratio of the π-conjugated conductive polymer decreases, and it is difficult to obtain sufficient conductivity.

(Hydroxyphenyl acrylic compound)
The hydroxyphenyl acrylic compound is a compound represented by the above chemical formula (1) or (2). In the chemical formula (1), X represents NH or O, and Y represents a hydrogen atom or a methyl group. In the chemical formula (1), m ₁ and n ₁ are each independently an integer of 1 to 5 (where m ₁ + n ₁ is 2 to 6). R in the chemical formula (2) represents a hydrogen atom or an arbitrary substituent. Here, as an arbitrary substituent, a methyl group, an ethyl group, a propyl group, a butyl group, a carboxy group, an aldehyde group, a phenyl group, a benzyl group etc. are mentioned, for example. In the chemical formula (2), m ₂ and n ₂ are each independently an integer of 1 to 5 (where m ₂ + n ₂ is 2 to 6).

Since the hydroxyphenyl acrylic compound represented by the chemical formula (1) can be easily obtained, the compound represented by the chemical formula (3) is preferable.
In the chemical formula (3), X represents NH or O, and Y represents a hydrogen atom or a methyl group. In the chemical formula (3), part or all of the hydrogen atoms of the aromatic ring may be substituted with a hydroxy group.

  Specific examples of the hydroxyphenyl acrylic compound represented by the chemical formula (3) include N- (4-hydroxyphenyl methacrylamide, N- (4-hydroxyphenyl) acrylamide, 4-hydroxyphenyl methacrylate, 4-hydroxyphenyl acrylate, N- (3-hydroxyphenyl) methacrylamide, N- (3-hydroxyphenyl) acrylamide, 3-hydroxyphenyl methacrylate, 3-hydroxyphenyl acrylate, N- (2-hydroxyphenyl) methacrylamide, N- (2-hydroxy Phenyl) acrylamide, 2-hydroxyphenyl methacrylate, 2-hydroxyphenyl acrylate, N- (2,3-dihydroxyphenyl) methacrylamide, N- (2,3-dihydroxyphenyl) a Rilamide, 2,3-dihydroxyphenyl methacrylate, 2,3-dihydroxyphenyl acrylate, N- (3,4-dihydroxyphenyl) methacrylamide, N- (3,4-dihydroxyphenyl) acrylamide, 3,4-dihydroxyphenyl methacrylate 3,4-dihydroxyphenyl acrylate, N- (2,4-dihydroxyphenyl) methacrylamide, N- (2,4-dihydroxyphenyl) acrylamide, 2,4-dihydroxyphenyl methacrylate, 2,4-dihydroxyphenyl acrylate, N- (2,3,4-trihydroxyphenyl) methacrylamide, N- (2,3,4-trihydroxyphenyl) acrylamide, 2,3,4-trihydroxyphenyl methacrylate, 2,3,4-to Hydroxyphenyl acrylate, N- (3,4,5-trihydroxyphenyl) methacrylamide, N- (3,4,5-trihydroxyphenyl) acrylamide, 3,4,5-trihydroxyphenyl methacrylate, 3,4, Examples include 5-trihydroxyphenyl acrylate.

Since the hydroxyphenyl acrylic compound represented by the chemical formula (2) can be easily obtained, the compound represented by the chemical formula (4) is preferable.
In the chemical formula (4), R represents a hydrogen atom or an arbitrary substituent. Here, as an arbitrary substituent, a methyl group, an ethyl group, a propyl group, a butyl group, a carboxy group, an aldehyde group, a phenyl group, a benzyl group etc. are mentioned, for example.
In the chemical formula (4), part or all of the hydrogen atoms of the aromatic ring may be substituted with a hydroxy group.

  Specific examples of the hydroxyphenyl acrylic compound represented by the chemical formula (4) include caffeic acid (3,4-dihydroxycinnamic acid), methyl caffeic acid (methyl 3,4-dihydroxycinnamic acid), and ferulic acid. , Synaptic acid, coumaric acid and the like.

  The content of the hydroxyphenyl acrylic compound is preferably 0.1 to 100 times, and preferably 0.1 to 10 times the total mass of the π-conjugated conductive polymer and the solubilized polymer. More preferred. There is a tendency that the effect of preventing the increase in surface resistance and improving the strength of the coating film is reduced. On the other hand, when the upper limit is exceeded, the conductivity tends to decrease due to the decrease in the concentration of the π-conjugated conductive polymer.

(solvent)
Examples of the solvent contained in the conductive polymer solution include water, N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, hexamethylene phosphortriamide, acetonitrile, benzoate. Polar solvents such as nitrile, phenols such as cresol, phenol and xylenol, alcohols such as methanol, ethanol, propanol and butanol, ketones such as acetone and methyl ethyl ketone, hydrocarbons such as hexane, benzene and toluene, formic acid and acetic acid Carboxylic acids such as ethylene carbonate and propylene carbonate, ether compounds such as dioxane and diethyl ether, ethylene glycol dialkyl ether, propylene glycol dialkyl ether, Chain ethers such as reethylene glycol dialkyl ether and polypropylene glycol dialkyl ether, heterocyclic compounds such as 3-methyl-2-oxazolidinone, nitrile compounds such as acetonitrile, glutaronitrile, methoxyacetonitrile, propionitrile, and benzonitrile Can be mentioned. These solvents may be used alone, as a mixture of two or more kinds, or as a mixture with other organic solvents.

(Dopant)
In order to further improve the conductivity, other dopants may be added to the conductive polymer solution in addition to the polyanion. Other dopants may be donor or acceptor as long as the π-conjugated conductive polymer can be oxidized and reduced.

[Donor dopant]
Examples of the donor dopant include alkali metals such as sodium and potassium, alkaline earth metals such as calcium and magnesium, tetramethylammonium, tetraethylammonium, tetrapropylammonium, tetrabutylammonium, methyltriethylammonium, dimethyldiethylammonium, and the like. A quaternary amine compound etc. are mentioned.

[Acceptor dopant]
As the acceptor dopant, for example, a halogen compound, Lewis acid, proton acid, organic cyano compound, organometallic compound, fullerene, hydrogenated fullerene, hydroxylated fullerene, carboxylated fullerene, sulfonated fullerene, or the like can be used.
Furthermore, examples of the halogen compound include chlorine (Cl ₂ ), bromine (Br ₂ ), iodine (I ₂ ), iodine chloride (ICl), iodine bromide (IBr), and iodine fluoride (IF). .
Examples of the Lewis acid include PF ₅ , AsF ₅ , SbF ₅ , BF ₅ , BCl ₅ , BBr ₅ , SO _{3 and the} like.
As the organic cyano compound, a compound containing two or more cyano groups in a conjugated bond can be used. Examples include tetracyanoethylene, tetracyanoethylene oxide, tetracyanobenzene, dichlorodicyanobenzoquinone (DDQ), tetracyanoquinodimethane, and tetracyanoazanaphthalene.

  Examples of the protonic acid include inorganic acids and organic acids. Furthermore, examples of the inorganic acid include hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, borohydrofluoric acid, hydrofluoric acid, and perchloric acid. Examples of organic acids include organic carboxylic acids, phenols, and organic sulfonic acids.

  As the organic carboxylic acid, aliphatic, aromatic, cycloaliphatic and the like containing one or more carboxy groups can be used. For example, formic acid, acetic acid, oxalic acid, benzoic acid, phthalic acid, maleic acid, fumaric acid, malonic acid, tartaric acid, citric acid, lactic acid, succinic acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, trifluoroacetic acid, nitroacetic acid, And triphenylacetic acid.

As the organic sulfonic acid, aliphatic, aromatic, cycloaliphatic or the like containing one or more sulfo groups, or a polymer containing sulfo groups can be used.
As one containing one sulfo group, for example, methanesulfonic acid, ethanesulfonic acid, 1-propanesulfonic acid, 1-butanesulfonic acid, 1-hexanesulfonic acid, 1-heptanesulfonic acid, 1-octanesulfonic acid, 1 -Nonanesulfonic acid, 1-decanesulfonic acid, 1-dodecanesulfonic acid, 1-tetradecanesulfonic acid, 1-pentadecanesulfonic acid, 2-bromoethanesulfonic acid, 3-chloro-2-hydroxypropanesulfonic acid, trifluoromethanesulfone Acid, trifluoroethanesulfonic acid, colistin methanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, aminomethanesulfonic acid, 1-amino-2-naphthol-4-sulfonic acid, 2-amino-5-naphthol- 7-sulfonic acid, 3-aminopropanesulfone N-cyclohexyl-3-aminopropanesulfonic acid, benzenesulfonic acid, alkylbenzenesulfonic acid, p-toluenesulfonic acid, xylenesulfonic acid, ethylbenzenesulfonic acid, propylbenzenesulfonic acid, butylbenzenesulfonic acid, pentylbenzenesulfonic acid, hex Tylbenzenesulfonic acid, heptylbenzenesulfonic acid, octylbenzenesulfonic acid, nonylbenzenesulfonic acid, decylbenzenesulfonic acid, undecylbenzenesulfonic acid, dodecylbenzenesulfonic acid, pentadecylbenzenesulfonic acid, hexadecylbenzenesulfonic acid, 2, 4-dimethylbenzenesulfonic acid, dipropylbenzenesulfonic acid, 4-aminobenzenesulfonic acid, o-aminobenzenesulfonic acid, m-aminobenzenesulfonic acid 4-amino-2-chlorotoluene-5-sulfonic acid, 4-amino-3-methylbenzene-1-sulfonic acid, 4-amino-5-methoxy-2-methylbenzenesulfonic acid, 2-amino-5-methyl Benzene-1-sulfonic acid, 4-amino-2-methylbenzene-1-sulfonic acid, 5-amino-2-methylbenzene-1-sulfonic acid, 4-amino-3-methylbenzene-1-sulfonic acid, 4 -Acetamide-3-chlorobenzenesulfonic acid, 4-chloro-3-nitrobenzenesulfonic acid, p-chlorobenzenesulfonic acid, naphthalenesulfonic acid, methylnaphthalenesulfonic acid, propylnaphthalenesulfonic acid, butylnaphthalenesulfonic acid, pentylnaphthalenesulfonic acid, 4 -Amino-1-naphthalenesulfonic acid, 8-chloronaphthalene-1- Examples include sulfonic acid, naphthalene sulfonic acid formalin polycondensate, melamine sulfonic acid formalin polycondensate, anthraquinone sulfonic acid, and pyrene sulfonic acid. These metal salts can also be used.

  Examples of those containing two or more sulfo groups include ethanedisulfonic acid, butanedisulfonic acid, pentanedisulfonic acid, decanedisulfonic acid, o-benzenedisulfonic acid, m-benzenedisulfonic acid, p-benzenedisulfonic acid, and toluenedisulfonic acid. Xylene disulfonic acid, chlorobenzene disulfonic acid, fluorobenzene disulfonic acid, dimethylbenzene disulfonic acid, diethylbenzene disulfonic acid, aniline-2,4-disulfonic acid, aniline-2,5-disulfonic acid, 3,4-dihydroxy-1,3 -Benzenedisulfonic acid, naphthalene disulfonic acid, methyl naphthalene disulfonic acid, ethyl naphthalene disulfonic acid, pentadecyl naphthalene disulfonic acid, 3-amino-5-hydroxy-2,7-naphthalene disulfonic acid, 1- Cetamide-8-hydroxy-3,6-naphthalenedisulfonic acid, 2-amino-1,4-benzenedisulfonic acid, 1-amino-3,8-naphthalenedisulfonic acid, 3-amino-1,5-naphthalenedisulfonic acid, 8-Amino-1-naphthol-3,6-disulfonic acid, 4-amino-5-naphthol-2,7-disulfonic acid, 4-acetamido-4'-isothio-cyanotostilbene-2,2'-disulfonic acid 4-acetamido-4′-isothiocyanatostilbene-2,2′-disulfonic acid, 4-acetamido-4′-maleimidylstilbene-2,2′-disulfonic acid, naphthalenetrisulfonic acid, dinaphthylmethanedisulfone An acid, anthraquinone disulfonic acid, anthracene sulfonic acid, etc. are mentioned. These metal salts can also be used.

(Binder)
The conductive polymer solution preferably contains a binder because the scratch resistance and surface hardness of the coating film are increased and the adhesion to the substrate to which the conductive polymer solution is applied is improved.
The binder may be a thermosetting resin or a thermoplastic resin. For example, polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyimides; polyamide imides; polyamides such as polyamide 6, polyamide 6, 6, polyamide 12, and polyamide 11; polyvinylidene fluoride, polyvinyl fluoride, polytetrafluoroethylene Fluoropolymers such as ethylene tetrafluoroethylene copolymer and polychlorotrifluoroethylene; vinyl resins such as polyvinyl alcohol, polyvinyl ether, polyvinyl butyral, polyvinyl acetate, and polyvinyl chloride; epoxy resins; xylene resins; aramid resins; Polyurea; polyurea; melamine resin; phenol resin; polyether; acrylic resin and copolymers thereof. These binders may be dissolved in an organic solvent, may be provided with a functional group such as a sulfonic acid group or a carboxylic acid group, may be formed into an aqueous solution, or may be dispersed in water such as emulsification.

  Among binders, one or more of polyurethane, polyester, acrylic resin, polyamide, polyimide, epoxy resin, and polyimide silicone are preferable because they can be easily mixed. Acrylic resins are suitable for applications such as optical filters because they have high hardness and excellent transparency.

The acrylic resin preferably contains a liquid polymer that is cured by heat energy and / or light energy.
Here, examples of the liquid polymer that is cured by thermal energy include a reactive polymer and a self-crosslinking polymer.
The reactive polymer is a polymer in which a monomer having a substituent is polymerized, and examples of the substituent include a carboxy group, an acid anhydride, an oxetane group, a glycidyl group, and an amino group. Specific monomers include malonic acid, succinic acid, glutamic acid, pimelic acid, ascorbic acid, phthalic acid, acetylsalicylic acid, adipic acid, isophthalic acid, benzoic acid, m-toluic acid and other carboxylic acid compounds, anhydrous Maleic acid, phthalic anhydride, dodecyl succinic anhydride, dichloromaleic anhydride, tetrachlorophthalic anhydride, tetrahydrophthalic anhydride, acid anhydrides such as pimelic anhydride, 3,3-dimethyloxetane, 3,3-dichloromethyloxetane Oxetane compounds such as 3-methyl-3-hydroxymethyloxetane and azidomethylmethyloxetane, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, phenol novolac polyglycidyl ether, N, N-diglycidyl-p-aminophenol Glycidyl ether compounds such as sidyl ether, tetrabromobisphenol A diglycidyl ether, hydrogenated bisphenol A diglycidyl ether (ie 2,2-bis (4-glycidyloxycyclohexyl) propane), N, N-diglycidyl aniline, tetra Glycidylamine compounds such as glycidyldiaminodiphenylmethane, N, N, N, N-tetraglycidyl-m-xylylenediamine, triglycidyl isocyanurate, N, N-diglycidyl-5,5-dialkylhydantoin, diethylenetriamine, triethylenetetramine, Dimethylaminopropylamine, N-aminoethylpiperazine, benzyldimethylamine, tris (dimethylaminomethyl) phenol, DHP30-tri (2-ethylhexoate), Amine compounds such as taphenylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, dicyandiamide, boron trifluoride, monoethylamine, menthanediamine, xylenediamine, ethylmethylimidazole, etc. Among compounds containing two or more oxirane rings in one molecule And glycidyl compound of epichlorohydrin of bisphenol A, or the like.

In the reactive polymer, at least a bifunctional or higher functional crosslinking agent is used. Examples of the crosslinking agent include melamine resin, epoxy resin, metal oxide and the like. Examples of the metal oxide include basic metal compounds Al (OH) ₃ , Al (OOC · CH ₃ ) ₂ (OOCH), Al (OOC · CH ₃ ) ₂ , ZrO (OCH ₃ ), Mg (OOC · CH _3). ), Ca (OH) ₂ , Ba (OH) _{3 and the} like can be used as appropriate.

  Self-crosslinking polymers are those that self-crosslink between functional groups by heating, and examples include those containing a glycidyl group and a carboxy group, and those containing both an N-methylol and a carboxy group.

Examples of the liquid polymer that is cured by light energy include oligomers or prepolymers such as polyester, epoxy resin, oxetane resin, polyacryl, polyurethane, polyimide, polyamide, polyamideimide, and polyimide silicone.
Examples of monomer units constituting a liquid polymer that is cured by light energy include bisphenol A / ethylene oxide-modified diacrylate, dipentaerythritol hexa (penta) acrylate, dipentaerythritol monohydroxypentaacrylate, and dipropylene glycol diacrylate. Acrylate, trimethylolpropane triacrylate, glycerin propoxytriacrylate, 4-hydroxybutyl acrylate, 1,6-hexanediol diacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, isobornyl acrylate, polyethylene glycol diacrylate, Pentaerythritol triacrylate, tetrahydrofurfuryl acrylate, trimethylolpropane tria Relates, acrylates such as tripropylene glycol diacrylate, tetraethylene glycol dimethacrylate, alkyl methacrylate, allyl methacrylate, 1,3-butylene glycol dimethacrylate, n-butyl methacrylate, benzyl methacrylate, cyclohexyl methacrylate, diethylene glycol dimethacrylate, 2- Such as ethylhexyl methacrylate, glycidyl methacrylate, 1,6-hexanediol dimethacrylate, 2-hydroxyethyl methacrylate, isobornyl methacrylate, lauryl methacrylate, phenoxyethyl methacrylate, t-butyl methacrylate, tetrahydrofurfuryl methacrylate, trimethylolpropane trimethacrylate, etc. Methacrylates Glycidyl ethers such as allyl glycidyl ether, butyl glycidyl ether, higher alcohol glycidyl edel, 1,6-hexanediol glycidyl ether, phenyl glycidyl ether, stearyl glycidyl ether, diacetone acrylamide, N, N-dimethylacrylamide, dimethylaminopropyl acrylamide , Dimethylaminopropylmethacrylamide, methacrylamide, N-methylolacrylamide, N, N-dimethylacrylamide, acryloylmorpholine, N-vinylformamide, N-methylacrylamide, N-isopropylacrylamide, Nt-butylacrylamide, N-phenyl Acrylics such as acrylamide, acryloylpiperidine, 2-hydroxyethylacrylamide ( Methacryl) amides, 2-chloroethyl vinyl ether, cyclohexyl vinyl ether, ethyl vinyl ether, hydroxybutyl vinyl ether, isobutyl vinyl ether, vinyl ethers such as triethylene glycol vinyl ether, carboxylic acid vinyl esters such as vinyl butyrate, vinyl monochloroacetate and vinyl pivalate And monofunctional monomers as well as polyfunctional monomers.

  A liquid polymer that is cured by light energy is cured by a photopolymerization initiator. Examples of the photopolymerization initiator include acetophenones, benzophenones, Michler benzoylbenzoate, α-amyloxime ester, tetramethylthiuram monosulfide, thioxanthones and the like. Furthermore, n-butylamine, triethylamine, tri-n-butylphosphine, etc. can be mixed as a photosensitizer.

  The binder content is preferably 0.1 to 1000 times, and 0.1 to 500 times the total mass of the π-conjugated conductive polymer, the solubilized polymer and the hydroxyphenylacrylic compound. It is more preferable that When the binder content is less than the lower limit value, the film strength of the resulting conductive coating film tends to be low. When the binder content exceeds the upper limit value, the conductivity due to a decrease in the concentration of the π-conjugated conductive polymer. Sexual decline may occur.

(Method for producing conductive polymer solution)
As a method for producing the conductive polymer solution, for example, a precursor monomer of π-conjugated conductive polymer is chemically oxidatively polymerized in water in the presence of a solubilized polymer, and a hydroxyphenyl acrylic compound is added. A method is mentioned.

  Specific examples of the precursor monomer of the π-conjugated conductive polymer include pyrrole, N-methylpyrrole, 3-methylpyrrole, 3-ethylpyrrole, 3-n-propylpyrrole, 3-butylpyrrole, and 3-octylpyrrole. 3-decylpyrrole, 3-dodecylpyrrole, 3,4-dimethylpyrrole, 3,4-dibutylpyrrole, 3-carboxypyrrole, 3-methyl-4-carboxypyrrole, 3-methyl-4-carboxyethylpyrrole, 3 -Methyl-4-carboxybutylpyrrole, 3-hydroxypyrrole, 3-methoxypyrrole, 3-ethoxypyrrole, 3-butoxypyrrole, 3-hexyloxypyrrole, 3-methyl-4-hexyloxypyrrole, thiophene, 3-methyl Thiophene, 3-ethylthiophene, 3-propylthiophene 3-butylthiophene, 3-hexylthiophene, 3-heptylthiophene, 3-octylthiophene, 3-decylthiophene, 3-dodecylthiophene, 3-octadecylthiophene, 3-bromothiophene, 3-chlorothiophene, 3-iodothiophene, 3-cyanothiophene, 3-phenylthiophene, 3,4-dimethylthiophene, 3,4-dibutylthiophene, 3-hydroxythiophene, 3-methoxythiophene, 3-ethoxythiophene, 3-butoxythiophene, 3-hexyloxythiophene, 3-heptyloxythiophene, 3-octyloxythiophene, 3-decyloxythiophene, 3-dodecyloxythiophene, 3-octadecyloxythiophene, 3,4-dihydroxythiophene, 3,4-dimethoxy Thiophene, 3,4-diethoxythiophene, 3,4-dipropoxythiophene, 3,4-dibutoxythiophene, 3,4-dihexyloxythiophene, 3,4-diheptyloxythiophene, 3,4-dioctyloxythiophene 3,4-didecyloxythiophene, 3,4-didodecyloxythiophene, 3,4-ethylenedioxythiophene, 3,4-propylenedioxythiophene, 3,4-butenedioxythiophene, 3-methyl- 4-methoxythiophene, 3-methyl-4-ethoxythiophene, 3-carboxythiophene, 3-methyl-4-carboxythiophene, 3-methyl-4-carboxyethylthiophene, 3-methyl-4-carboxybutylthiophene, aniline, 2-methylaniline, 3-isobutylaniline 2-aniline sulfonic acid, and 3-aniline sulfonic acid.

  Examples of the oxidizing agent and oxidation catalyst used in the polymerization of the precursor monomer include ammonium peroxodisulfate (ammonium persulfate), sodium peroxodisulfate (sodium persulfate), and potassium peroxodisulfate (potassium persulfate). Transition metal compounds such as peroxodisulfate, ferric chloride, ferric sulfate, ferric nitrate, cupric chloride, metal halides such as boron trifluoride, metal oxides such as silver oxide and cesium oxide Substances, peroxides such as hydrogen peroxide and ozone, organic peroxides such as benzoyl peroxide, oxygen and the like.

The hydroxyphenyl acrylic compound may be added before the precursor monomer is polymerized or may be added after the polymerization.
The solvent may be any solvent that can dissolve or disperse the precursor monomer and can maintain the oxidizing power of the oxidizing agent and the oxidation catalyst. For example, the solvent contained in the conductive polymer solution The same thing is mentioned.

Since the hydroxyphenylacrylic compound contained in the conductive polymer solution of the present invention has a phenolic hydroxy group, it has a function as a primary antioxidant, and even when exposed to visible light or ultraviolet light for a long time. It is possible to form a conductive coating that does not easily increase in resistance.
In particular, in the hydroxyphenylacryl compound represented by the chemical formula (3), since the acrylic part and the hydroxy group are present in the para position, dimerization at the para position due to oxidation can be prevented and yellowing can be suppressed. Moreover, since the hydroxyphenyl acryl compound represented by the chemical formula (4) has an effect of increasing conductivity, the amount added can be reduced.

In addition, the hydroxyphenyl acrylic compound contained in the conductive polymer solution of the present invention has an unsaturated double bond, and is polymerized or cross-linked during drying, and thus has excellent film forming properties.
Further, as a result of investigation by the present inventors, it was found that even when the hydroxyphenylacryl compound is included, a stable solution state can be secured and the conductivity is high.

<Conductive coating film>
The conductive coating film of the present invention is formed by applying the above-described conductive polymer solution. Examples of the method for applying the conductive polymer solution include dipping, comma coating, spray coating, roll coating, and gravure printing.
After coating, it is preferable to cure the coating film by heat treatment or ultraviolet irradiation treatment. As the heat treatment, for example, a normal method such as hot air heating or infrared heating can be employed. As the ultraviolet irradiation treatment, for example, a method of irradiating ultraviolet rays from a light source such as an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, or a metal halide lamp can be employed.

  The above conductive coating film is formed by applying the above-mentioned conductive polymer solution, so that it has high conductivity, and even when exposed to visible light or ultraviolet light for a long time, the surface resistance is unlikely to increase. .

(Production Example 1) Synthesis of solubilized polymer 1.14 g of ammonium persulfate oxidizer solution in which 206 g of sodium styrenesulfonate was dissolved in 1000 ml of ion-exchanged water and was previously stirred in 10 ml of water while stirring at 80 ° C. Was added dropwise for 20 minutes and the solution was stirred for 12 hours.
To the obtained sodium styrenesulfonate-containing solution, 1000 ml of sulfuric acid diluted to 10% by mass was added, about 1000 ml of the polystyrenesulfonic acid-containing solution was removed by ultrafiltration, and 2000 ml of ion-exchanged water was added to the remaining liquid. About 2000 ml of solution was removed by ultrafiltration. The above ultrafiltration operation was repeated three times.
Water in the obtained solution was removed under reduced pressure to obtain colorless solid polystyrene sulfonic acid.

(Production Example 2) Synthesis of a conductive polymer solution containing a π-conjugated conductive polymer 14.2 g of 3,4-ethylenedioxythiophene and 36.7 g of polystyrene sulfonic acid were dissolved in 2000 ml of ion-exchanged water. The solution was mixed at 20 ° C.
While maintaining the mixed solution thus obtained at 20 ° C. and stirring, 29.64 g of ammonium persulfate dissolved in 200 ml of ion exchange water and 8.0 g of ferric sulfate oxidation catalyst solution were slowly added, The reaction was stirred for 3 hours.
2000 ml of ion-exchanged water was added to the obtained reaction solution, and about 2000 ml of solution was removed by ultrafiltration. This operation was repeated three times.
Then, 200 ml of sulfuric acid diluted to 10% by mass and 2000 ml of ion-exchanged water are added to the resulting solution, about 2000 ml of solution is removed by ultrafiltration, and 2000 ml of ion-exchanged water is added to this solution. About 2000 ml of solution was removed by external filtration. This operation was repeated three times.
Furthermore, 2000 ml of ion-exchanged water was added to the obtained solution, and about 2000 ml of the solution was removed by ultrafiltration. This operation was repeated 5 times to obtain about 1.2% by weight of blue polystyrenesulfonic acid-doped poly (3,4-ethylenedioxythiophene) (PEDOT-PSS aqueous solution) as a conductive polymer solution.

Example 1
To 2.0 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol and 15 mg of N- (4-hydroxyphenyl) methacrylamide were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 18 bar coater and dried to form a conductive coating film. The surface resistance of this conductive coating was measured using a Loresta (Mitsubishi Chemical).
Furthermore, after irradiating with a carbon arc for 48 hours, the surface resistance of the conductive coating film was measured. The measurement results are shown in Table 1.

(Example 2)
To 2.0 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol and 30 mg of N- (4-hydroxyphenyl) methacrylamide were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 8 bar coater and dried to form a conductive coating film. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

(Example 3)
To 2.0 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol and 30 mg of N- (4-hydroxyphenyl) methacrylamide were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 18 bar coater and dried to form a conductive coating film. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

Example 4
To 2.0 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol and 15 mg of caffeic acid were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 18 bar coater and dried to form a conductive coating film. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

(Example 5)
To 2.0 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol and 30 mg of caffeine were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 8 bar coater and dried to form a conductive coating film. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

(Example 6)
To 2.0 g of the aqueous PEDOT-PSS obtained in Production Example 2, 2.0 g of ethanol and 30 mg of caffeic acid were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 18 bar coater and dried to form a conductive coating film. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

(Example 7)
To 2.0 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol and 15 mg of methyl caffeate were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 18 bar coater and dried to form a conductive coating film. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

(Example 8)
To 2.0 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol and 30 mg of methyl caffeate were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 8 bar coater and dried to form a conductive coating film. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

Example 9
To 2.0 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol and 30 mg of methyl caffeate were added and stirred to obtain a conductive polymer solution. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 18 bar coater and dried to form a conductive coating film. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

(Comparative Example 1)
A conductive coating film was formed in the same manner as in Example 1 except that N- (4-hydroxyphenyl) acrylamide was not added in Example 1. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

(Comparative Example 2)
A conductive coating film was formed in the same manner as in Example 2 except that N- (4-hydroxyphenyl) acrylamide was not added in Example 2. The surface resistance of the conductive coating film before and after the ultraviolet irradiation for 48 hours was measured using a Loresta (manufactured by Mitsubishi Chemical). The measurement results are shown in Table 1.

The conductive polymer solutions of Examples 1 to 3 including a π-conjugated conductive polymer, a solubilized polymer, a hydroxyphenylacryl compound represented by the chemical formula (3), and a solvent have a stable solution state. It was. Moreover, the electrically conductive coating film of Examples 1-3 has low surface resistance, and also the increase in surface resistance when irradiated with ultraviolet light was suppressed.
In addition, the conductive polymer solutions of Examples 4 to 9 including the π-conjugated conductive polymer, the solubilized polymer, the hydroxyphenylacryl compound represented by the chemical formula (4), and the solvent have a stable solution state. Was. Moreover, the conductive coating films of Examples 4 to 9 had a low surface resistance, and further, the increase in surface resistance when irradiated with ultraviolet light was suppressed.
In contrast, a π-conjugated conductive polymer, a solubilized polymer, and a solvent are included, and the hydroxyphenylacryl compound represented by the chemical formula (3) and the hydroxyphenylacryl compound represented by the chemical formula (4) are not included. The conductive coating films of Comparative Examples 1 and 2 formed from the conductive polymer solution had high surface resistance. Moreover, the surface resistance significantly increased when irradiated with ultraviolet light.

(Example 10)
To 20 g of the PEDOT-PSS aqueous solution obtained in Production Example 2, 2.0 g of ethanol, 0.3 g of caffeic acid and 6 mg of Irgacure 127 (manufactured by Ciba Specialty Chemicals) are added and stirred to obtain a conductive polymer solution. It was. Then, the conductive polymer solution was applied onto a polyethylene terephthalate film using a # 18 bar coater, dried, and further irradiated with ultraviolet rays to form a conductive coating film.
Further, water was soaked into a cloth (Adclean Wiper F1 type), and the resulting conductive coating film was wiped 10 times while applying a load of φ50 mm and 200 g. Thereafter, the surface resistance of the conductive coating film was measured using a Loresta (Mitsubishi Chemical). The measurement results are shown in Table 2.

(Example 11)
In Example 10, a conductive coating film was formed in the same manner as in Example 10 except that ultraviolet rays were not irradiated when the coating film was formed. The surface resistance of this conductive coating film was measured in the same manner as in Example 10. The measurement results are shown in Table 2.

(Comparative Example 3)
A conductive coating film was formed in the same manner as in Example 10 except that caffeic acid was not added in Example 10. The surface resistance of this conductive coating film was measured in the same manner as in Example 10. The measurement results are shown in Table 2.

The conductive polymer solutions of Examples 10 and 11 including the π-conjugated conductive polymer, the solubilized polymer, the hydroxyphenylacryl compound represented by the chemical formula (4), and the solvent have a stable solution state. It was. Moreover, the surface resistance of the conductive coating films of Examples 10 and 11 was low. Moreover, the electroconductive coating film of Example 10 cured by ultraviolet rays was excellent in the strength of the coating film. Therefore, the conductive polymer solution of Example 10 is excellent in film formability.
In contrast, a π-conjugated conductive polymer, a solubilized polymer, and a solvent are included, and the hydroxyphenylacryl compound represented by the chemical formula (3) and the hydroxyphenylacryl compound represented by the chemical formula (4) are not included. The conductive coating film of Comparative Example 3 formed from the conductive polymer solution had a high surface resistance. Moreover, the strength of the coating film was low and the film formability was low.

Claims (5)

A conductive polymer comprising a π-conjugated conductive polymer, a solubilized polymer, a hydroxyphenylacryl compound represented by the following chemical formula (1) or the following chemical formula (2), and a solvent: solution.

(X in the chemical formula (1) represents NH or O, Y represents a hydrogen atom or a methyl group. Further, m ₁ and n ₁ in the chemical formula (1) are each independently any one of 1 to 5 It is an integer (where m ₁ + n ₁ is 2 to 6.) R in chemical formula (2) represents a hydrogen atom or an arbitrary substituent, and m ₂ and n ₂ in chemical formula (2) are each independent. Any integer of 1 to 5 (where m ₂ + n ₂ is 2 to 6). The conductive polymer solution according to claim 1, wherein the hydroxyphenylacrylic compound represented by the chemical formula (1) is a compound represented by the following chemical formula (3).

(X in chemical formula (3) represents NH or O, and Y represents a hydrogen atom or a methyl group. In chemical formula (3), part or all of the hydrogen atoms in the aromatic ring are substituted with hydroxy groups. May be.) The conductive polymer solution according to claim 1, wherein the hydroxyphenylacrylic compound represented by the chemical formula (2) is a compound represented by the following chemical formula (4).

(R in the chemical formula (4) represents a hydrogen atom or an arbitrary substituent. In the chemical formula (4), part or all of the hydrogen atoms of the aromatic ring may be substituted with a hydroxy group.)   The conductive polymer solution according to claim 1, further containing a binder resin.   A conductive coating film formed by applying the conductive polymer solution according to claim 1.