Patent Description:
A conductive polymer is used as a solid electrolyte for a capacitor, an electromagnetic wave absorbing coating agent, an antistatic coating agent, an undercoating agent for electroplating, conductive ink for circuit wiring or the like.

For example, by using a conductive polymer for a solid electrolyte of a capacitor, a high-performance capacitor with high heat resistance and low electrical resistance can be produced, and such a capacitor has recently been popularized for an in-vehicle application.

Polyaniline, which is a kind of a conductive polymer, has advantages of being relatively easily synthesized from inexpensive aniline and exhibiting excellent stability against oxygen and the like in a conductive state, in addition to its electrical properties, and polyaniline having high conductivity can be easily prepared by, for example, the method described in Patent Document <NUM>.

Various compositions using a conductive polymer have been studied, and for example, Patent Document <NUM> discloses a conductive composition containing a specific polyaniline and a polymer compound having an acidic group or a salt thereof. In addition, Patent Document <NUM> discloses a composition for forming an electroless plating undercoat film containing a conductive polymer and a polyvinyl acetal resin. Patent Document <NUM> is directed at a conductive polymer composition including a conductive polymer and at least two solvents selected from solvents which are di-n-alkyl monoethers ethers bearing a terminal primary hydroxy group. Therein, examples including components such as polyaniline, amylphenol, a solvent as well as a resin or polymeric component such as a non-ionic emulsifier are disclosed. Patent Document <NUM> is directed at an electrically conductive composition comprising a solvent, a π-conjugated conductive polymer having a chlorine-content of <NUM> wt-% or less and a hydroxy-substituted aryl compound. Therein, compositions comprising components such as polyaniline, various phenolic compounds such as amylphenol, a solvent as well as a resin or a polymeric component such as a non-ionic emulsifier are disclosed in the examples. Patent Document <NUM> is directed at a method for producing a polyaniline complex composition, wherein such compositions including components such as polyaniline, amylphenol, a solvent as well as a resin or polymeric component such as a non-ionic emulsifier are disclosed in the examples. Patent Document <NUM> is directed at a composition for forming a primer film, specifically a composition for forming an electroless plating primer film that contains a polyurethane resin and a conductive polymer. Therein, compositions comprising polyaniline, various resins such as polyvinyl butyral, solvent and phenolic components are disclosed in the examples. Patent Document <NUM> is directed at compositions of electrically conductive substituted and unsubstituted polyanilines in nonconductive substrates such as polymers or polymers plus solvents with protonic acids. Therein, in the examples compositions comprising polyaniline, polyvinyl butyral or polyvinyl acetate as well as solvents and phenolic components are disclosed. Patent Document <NUM> is directed at a rust preventive coating composition precursor comprising polyaniline, polyvinyl butyral and an alcoholic solvent. In the examples of the document, compositions comprising polyaniline, polyvinyl butyral and additional resins such as epoxy resins, a polyurethane resin, or a fluororesin as well as solvents or solvent mixtures are disclosed. Patent Document <NUM> is directed at a conductor connecting structure and a connecting member. In the examples of the document, compositions comprising polyaniline, polyvinyl butyral or polyvinyl acetate, solvents and phenolic compounds such as cresol are disclosed. Patent Document <NUM> is directed at a composition for forming an electroless plating primer film that contains a conductive polymer and a urethane resin. Therein, in the document compositions comprising polyaniline, urethane resins, polyvinyl butyral, solvents and phenolic components are disclosed. Patent Document <NUM> is directed at electrostatic dissipative compositions comprising a first polymer, a second polymer, and a naphthyl sulfonic acid. In the document, compositions comprising polyaniline, polyvinyl butyral, polyvinyl alcohol, polyvinyl acetate and various other resins together with phenolic compounds such as bisphenol A are disclosed. Patent Document <NUM> is directed at a composition for forming an electroless plating base film containing a conductive polymer, a urethane resin and isocyanate. Therein, a polyaniline composition including polyvinyl butyral as well as solvents and phenolic components is disclosed.

However, the conventional composition has a problem that the heat resistance and moisture resistance of the obtained conductive film are low. It is an object of the invention to provide a composition capable of forming a conductive film excellent in heat resistance and moisture resistance.

According to the invention, the following composition is provided.

According to the invention, it is possible to provide a composition capable of forming a conductive film excellent in heat resistance and moisture resistance.

A composition according to an aspect of the invention containing: (a) a conductive polymer, (b) a resin having a solubility parameter of <NUM> to <NUM> MPa<NUM>/<NUM> [<NUM> to <NUM> (cal/cm<NUM>)<NUM>/<NUM>], (c) a solvent, and (d) a phenolic compound,.

By containing a resin (a component (b)) having a specific physical property, the above composition can form a conductive film excellent in both heat resistance and moisture resistance. Specifically, the obtained conductive film has a low increase in resistance value and high stability when left for a long period of time under a high temperature condition or a high moisture condition. Further, the component (b) does not necessarily have to be contained in a large amount, and an effect of improving large heat resistance and moisture resistance can be obtained even in a small amount. In addition, since the above composition contains a component (d), the conductivity of the obtained conductive film can be improved.

The conductive polymer comprises one or more selected from the group consisting of polyaniline, polythiophene, polypyrrole, and derivatives thereof. These conductive polymers may or may not have a substituent. These conductive polymers may be used alone or in combination of two or more kinds.

As the conductive polymer, polyaniline is preferred.

The polyaniline preferably has a weight-average molecular weight of <NUM>,<NUM> or more, more preferably <NUM>,<NUM> or more, still more preferably <NUM>,<NUM> or more and <NUM>,<NUM>,<NUM> or less, further more preferably <NUM>,<NUM> or more and <NUM>,<NUM>,<NUM> or less, and particularly preferably <NUM>,<NUM> or more and <NUM>,<NUM>,<NUM> or less.

The weight-average molecular weight of polyaniline is measured by the method described in Examples.

Polyaniline may or may not have a substituent, but is preferably an unsubstituted polyaniline from the viewpoint of versatility and economical efficiency.

Examples of the substituent in the case when polyaniline has a substituent include a linear or branched hydrocarbon group such as a methyl group, an ethyl group, a hexyl group and an octyl group; an alkoxy group such as a methoxy group and an ethoxy group; an aryloxy group such as a phenoxy group; a halogenated hydrocarbon such as a trifluoromethyl group (-CF<NUM> group) can be given.

Further, it is preferable that the conductive polymer be a polyaniline complex in which a proton donor is doped into polyaniline.

The fact that the proton donor is doped into the polyaniline can be confirmed by ultraviolet, visible, near infrared spectroscopy or X-ray photoelectron spectroscopy, and the proton donor can be used without any particular structural limitation as long as the proton donor is sufficiently acidic to generate a carrier in the polyaniline.

The use of the polyaniline complex is preferred because of its improved solubility in a solvent.

Examples of the proton donor include, for example, Bronsted acids, or salts thereof, and is preferably organic acids, or salts thereof (e.g., sulfonic acids or sulfonates), and more preferably proton donors represented by the following formula (I).

In the formula (I), M is a hydrogen atom, an organic free radical or an inorganic free radical.

Examples of the organic free radical include a pyridinium group, an imidazolium group, an anilinium group, for example. Examples of the inorganic free radicals include sodium, lithium, potassium, cesium, and ammonium.

X is an acidic group, such as a group represented by -SO<NUM>-, -PO<NUM><NUM>-, -PO<NUM>(OH)-, -OPO<NUM><NUM>-, - OPO<NUM>(OH)-, -COO , and a group represented by -SO<NUM>- is preferred.

A is a hydrocarbon group which may contain a substituent.

Examples of the hydrocarbon group include, (n+<NUM>) valence groups corresponding to, for example, a linear or branched alkyl group including <NUM> to <NUM> carbon atoms; an alkenyl group; a cycloalkyl group which may contain a substituent, such as a cyclopentyl, a cyclohexyl, a cycloheptyl, a cyclooctyl, a menthyl; a dicycloalkyl group or a polycycloalkyl group which may be condensed, such as a bicyclohexyl, a norbornyl, an adamantyl; an aryl group containing an aromatic ring which may contain a substituent, such as a phenyl, a tosyl, a thiophenyl, a purrolynyl, a pyridinyl, a furanyl; a diaryl group or polyaryl group which may be condensed, such as a naphthyl, an anthracenyl, a fluorenyl, a <NUM> ,<NUM>,<NUM>,<NUM>-tetrahydronaphthyl, an indanyl, a quinolinyl, a indonyl; or an alkylaryl group.

R's are independently a substituent represented by -R<NUM>, -OR<NUM>, -COR<NUM>, -COOR<NUM>, -CO(COR<NUM>), or -CO(COOR<NUM>).

R<NUM> is a hydrocarbon group which may contain a substituent including <NUM> or more carbon atoms, a silyl group, an alkylsilyl group, a group represented by -(R<NUM>O)x-R<NUM>, or a group represented by -(OSiR<NUM><NUM>)x-OR<NUM> (R<NUM> is an alkylene group, R<NUM>'s are independently a hydrocarbon group which may be the same or different, and x is an integer of <NUM> or more).

Examples of the hydrocarbon group of R<NUM> include a linear or branched, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, dodecyl group, pentadecyl group, and eicosanil group.

n is an integer of <NUM> or more. m is a valence of M.

The organic proton acid represented by the formula (I) or a salt thereof is preferably dialkylbenzenesulfonic acid, dialkylnaphthalenesulfonic acid, sulfophthalic acid ester, or an organic protonic acid represented by the following formula (II) or a salt thereof.

M(XCR<NUM>(CR<NUM><NUM>COOR<NUM>)COOR<NUM>)p     (II).

In the formula (II), M and X are the same as in the formula (I).

R<NUM> and R<NUM> are independently a hydrogen atom, a hydrocarbon group or a group represented by R<NUM><NUM>Si- (wherein R<NUM> is a hydricarbon group and the three R<NUM>'s may be the same or different).

Examples of the hydrocarbon group of R<NUM> and R<NUM> include a linear or branched alkyl group including <NUM> to <NUM> carbon atoms; an aryl group containing an aromatic ring; and an alkylaryl group.

The hydrocarbon group of R<NUM> is the same as the hydrocarbon group of R<NUM> and R<NUM>.

R<NUM> and R<NUM> are independently a hydrocarbon group or a group represented by -(R<NUM>O)q-R<NUM> [wherein R<NUM> is a hydrocarbon group or a silylen group, R<NUM> is a hydrogen atom, a hydrocarbon group, or a group represented by R<NUM><NUM>Si- (R<NUM> is a hydrocarbon group, and three R<NUM>'s may be the same or different), and q is an integer of <NUM> or more].

Examples of the hydrocarbon group of R<NUM> and R<NUM> include a linear or branched alkyl group including <NUM> to <NUM>, preferably <NUM> or more carbon atoms; an aryl group containing an aromatic ring; and an alkylaryl group.

Specific examples of the hydrocarbon group of R<NUM> and R<NUM> include a linear or branched, butyl group, pentyl group, hexyl group, octyl group, and decyl group.

Examples of the hydrocarbon group of R<NUM> include a linear or branched alkylene group including <NUM> to <NUM> carbon atoms; an arylene group containing an aromatic ring; an alkylarylene group; and an arylalkylene group.

Examples of the hydrocarbon group of R<NUM> and R<NUM> are the same as those of R<NUM> and R<NUM>. q is preferably an integer of <NUM> to <NUM>.

Specific examples of the organic protonic acid or salt thereof represented by the formula (II) when each of R<NUM> and R<NUM> are a group represented by -(R<NUM>O)n-R<NUM> include an acid represented by the following formula:
<CHM>
<CHM>
wherein in the formula, X is a group represented by -SOs.

The compound represented by the formula (II) (a organic protonic acid or a salt thereof) is preferably a sulfosuccinic acid derivative represented by the following formula (III).

M(O<NUM>SCH(CH<NUM>COOR<NUM>)COOR<NUM>)m     (III).

In the formula (III), M and m are the same as in the formula (I).

R<NUM> and R<NUM> are independently a hydrocarbon group or a group represented by -(R<NUM>O)r-R<NUM> [wherein R<NUM> is a hydrocarbon group or a silylene group, R<NUM> is a hydrogen atom, a hydrocarbon group or a group represented by R<NUM><NUM>Si- (wherein R<NUM> is a hydrocarbon group and three R<NUM>'s may be the same or different), and r is an integer of <NUM> or more].

The hydrocarbon group of each of R<NUM> and R<NUM> are the same as the hydrocarbon group of each of R<NUM> and R<NUM>.

The hydrocarbon group of R<NUM> is the same as the hydrocarbon group of R<NUM>. The hydrocarbon group of each of R<NUM> and R<NUM> are the same as the hydrocarbon group of each of R<NUM> and R<NUM>.

r is preferably an integer of <NUM> to <NUM>.

Specific examples of the organic proton acid or salt thereof represented by the formula (III) when each of R<NUM> and R<NUM> are a group represented by -(R<NUM>O)r-R<NUM> is the same as the organic protonic acid or salt thereof represented by the formula (II) when each of R<NUM> and R<NUM> are a group represented by -(R<NUM>O)n-R<NUM>.

The hydrocarbon group of each of R<NUM> and R<NUM> are the same as the hydrocarbon group of each of R<NUM> and R<NUM>, and are preferably a butyl group, a hexyl group, a <NUM>-ethylhexyl group, and a decyl group.

The doping ratio of the proton donor based on the polyaniline is preferably <NUM> or more and <NUM> or less, more preferably <NUM> or more and <NUM> or less, still more preferably <NUM> or more and <NUM> or less, and particularly preferably <NUM> or more and <NUM> or less. When the doping ratio is <NUM> or more, the solubility of the polyaniline complex in an organic solvent is sufficiently high.

The doping ratio is defined as (the number of moles of the proton donor doped into polyaniline)/ (the number of moles of monomer units of polyaniline). For example, the case when a doping ratio of a polyaniline complex containing an unsubstituted polyaniline and a proton donor is <NUM> means that one proton donor is doped for two monomer unit moleculars of polyaniline.

The doping ratio can be calculated if the number of moles of the proton donor and polyaniline monomer units in the polyaniline complex can be measured. For example, when the proton donor is an organic sulfonic acid, the doping ratio can be calculated by determining the number of moles of sulfur atoms derived from a proton donor and the number of moles of the nitrogen atoms derived from a monomer unit of polyaniline, and taking a ratio of these values.

The polyaniline complex preferably contains an unsubstituted polyaniline and a sulfonic acid which is a proton donor, and satisfies the following formula (<NUM>): <MAT> wherein in the formula, Ss is the sum of the number of moles of sulfur atoms contained in the polyaniline complex, N<NUM> is the sum of the number of moles of nitrogen atoms contained in the polyaniline complex, and the number of moles of nitrogen atoms and sulfur atoms are the values determined by an organic element analysis.

It is considered that the composition according to an aspect of the invention can suppress the deterioration of the component (a) under high temperature condition and/or high moisture condition by containing the resin having a solubility parameter (hereinafter, sometimes referred to as "a SP value") of <NUM> to <NUM> MPa<NUM>/<NUM> [<NUM> to <NUM> (cal/cm<NUM>)<NUM>/<NUM>] and can improve the heat resistance and moisture resistance of the conductive film. When the SP value of the component (b) is within the above range, a compatibility with the component (a) is excellent, so that it is possible to sufficiently exhibit the effect of suppressing the deterioration due to the component (b).

For example, in the case where a conductive polymer doped with a proton donor is used as the component (a), it is assumed that the performance of the component (a) itself is deteriorated by de-doping the proton donor under high temperature condition and/or high moisture condition, and it is considered that by containing the component (b), the de-doping can be suppressed, and heat resistance and moisture resistance can be enhanced.

The SP value of the component (b) is preferably <NUM> to <NUM> MPa<NUM>/<NUM> [<NUM> to <NUM> (cal/cm<NUM>)<NUM>/<NUM>], more preferably <NUM> to <NUM> MPa<NUM>/<NUM> [<NUM> to <NUM> (cal/cm<NUM>)<NUM>/<NUM>].

The SP value is calculated by <NPL>. Specific examples are as described in Examples.

As the component (b), a polyvinyl acetal resin having the above SP value is used. Examples of the component (b) include a resin conventionally used as a binder, which is a polyvinyl acetal resin.

The molecular weight of the component (b) is not particularly limited, but is preferably <NUM>,<NUM> to <NUM>,<NUM>.

The polyvinyl acetal resin (an acetalized polyvinyl alcohol) is a resin obtained by reacting polyvinyl alcohol (PVA) with aldehydes, and usually has a structure (repeat unit) represented by the following formula (b1).

In the formula, R' represents a hydrogen atom or a substituent derived from aldehydes.

Examples of R' include an alkyl group, a cycloalkyl group, an allyl group, and an aryl group. Examples of the alkyl group include a methyl, an ethyl, a propyl, an isopropyl, a butyl, an isobutyl, and a t-butyl. Examples of the cycloalkyl group include a cyclopentyl, and a cyclohexyl. Examples of the aryl group include a phenyl, and a naphthyl.

In addition, when PVA is not completely acetalized, for example, as represented by the following formula (b2), a hydroxyl group or an acetyl group may be contained in the molecular structure.

In the formula, R' is the same as in the formula (b1). I, m and n represent the abundance ratio (mol%) of each structural unit. Each abundance ratio is, for example, <NUM> to <NUM> mol% for I, <NUM> to <NUM> mol% for m, and <NUM> to <NUM> mol% for n.

Examples of the polyvinyl acetal resin include polyvinyl butyral, polyvinyl acetoacetal, and polyvinyl formal.

Specific examples of the polyvinyl acetal resin include S-REC series (manufactured by SEKISUI CHEMICAL CO. ) such as S-REC B BX-<NUM>, S-REC K KS-<NUM>, S-REC B BX-L, S-REC K KS-<NUM>, S-REC K KS-5Z, S-REC K KS-6Z, S-REC B BH-S, S-REC B BM-S, S-REC B BL-S, S-REC B BL-<NUM>, S-REC B BM-<NUM>, S-REC B BH-<NUM>, S-REC B BX-<NUM>, and S-REC B BX-<NUM>, and the Mowital series (manufactured by KURARAY CO. ) such as Mowital B16H, B30T, B30H, B60T, B60H.

The added amount of the component (b) is <NUM> to <NUM>% by mass, <NUM> to <NUM>% by mass, <NUM> to <NUM>% by mass, <NUM> to <NUM>% by mass, <NUM> to <NUM>% by mass, or <NUM> to <NUM>% by mass, based on the amount of the component (a).

Further, the added amount of the component (b) is preferably <NUM> to <NUM>% by mass, more preferably <NUM> to <NUM>% by mass or less, and may be <NUM>% by mass or more and less than <NUM>% by mass, <NUM> to <NUM>% by mass, or <NUM> to <NUM>% by mass, based on the total amount of the component (a) and the component (b).

The composition according to an aspect of the invention highly effective in improving heat resistance and moisture resistance even if the added amount of the component (b) is small. When the added amount of the component (b) is small, the conductivity can be further increased.

The composition according to an aspect of the invention preferably contains a solvent. The solvent is not particularly limited as long as it dissolves the component (a), but an organic solvent is preferred. The organic solvent may be a water-soluble organic solvent or an organic solvent substantially immiscible with water (water-immiscible organic solvent).

The water-soluble organic solvent may be a protic polar solvent or an aprotic polar solvent, and examples thereof include alcohols such as isopropyl alcohol, <NUM>-butanol, <NUM>-butanol, <NUM>-pentanol, benzyl alcohol, and alkoxy alcohols (e.g., <NUM>-methoxy-<NUM>-propanol, <NUM>-methoxy-<NUM>-butanol); ketones such as acetone; ethers such as tetrahydrofuran, dioxane, and ethylene glycol mono-tert-butyl ether; aprotic polar solvents such as N-methylpyrrolidone.

Examples of the water-immiscible organic solvent include hydrocarbon-based solvents such as hexane, benzene, toluene, xylene, ethyl benzene, and tetralin; halogen containing solvents such as methylene chloride, chloroform, carbon tetrachloride, dichloroethane, and tetrachloroethane; ester-based solvents such as ethyl acetate, isobutyl acetate, and n-butyl acetate; ketone-based solvents such as methyl isobutyl ketone (MIBK), methyl ethyl ketone, cyclopentanone, and cyclohexanone; and ether-based solvents such as cyclopentyl methyl ether. Further, an isoparaffin-based solvent containing one or two or more kinds of isoparaffin-based solvents may be used as the hydrocarbon-based solvent.

Among these, toluene, xylene, methyl isobutyl ketone, chloroform, trichloroethane and ethyl acetate are preferred in terms of excellent solubility of the component (a).

Note that the polyaniline complex among the components (a) can be dissolved even if the solvent is alcohols such as isopropyl alcohol, <NUM>-butanol, <NUM>-butanol, <NUM>-pentanol, benzyl alcohol, or alkoxy alcohol. Alcohol is preferable in the viewpoint of reducing environment burden as compared with an aromatic compound such as toluene.

When an organic solvent is used as a solvent, it is preferable to use a mixed organic solvent in which a water-immiscible organic solvent and a water-soluble organic solvent are mixed in a ratio of <NUM> to <NUM>: <NUM> to <NUM> (mass ratio), because the generation of gel or the like during storing can be prevented and can be stored for a long period of time.

As the water-immiscible organic solvent of the above mixed organic solvent, a low-polarity organic solvent can be used, and as the low-polarity organic solvent, hydrocarbon-based solvents such as hexane and toluene; halogen containing solvents such as chloroform; and isoparaffinibased solvent is preferred.

As the water-soluble organic solvent of the mixed organic solvent, a high-polarity organic solvent can be used, and for example, alcohols such as methanol, ethanol, isopropyl alcohol, <NUM>-methoxyethanol, <NUM>-ethoxyethanol, <NUM>-methoxy-<NUM>-propanol, and <NUM>-methoxy-<NUM>-butanol; ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; and ethers such as tetrahydrofuran, diethyl ether, and ethylene glycol mono-tert-butyl ether are preferred.

The mixed organic solvent may contain one or two or more kinds of water-immiscible organic solvents, and may contain one or two or more kinds of water-soluble organic solvents.

The composition according to an aspect of the invention can improve the conductivity of the conductive film by using a phenolic compound.

The phenolic compound is a compound represented by ArOH, wherein Ar is an aryl group or a substituted aryl group. Specific examples thereof include phenol; substituted phenols such as o-, m- or p-cresol, o-, m- or p-ethyl phenol, o-, m- or p-propylphenol, o-, m- or p-butylphenol, o-, m- or p-chlorophenol, salicylic acid, hydroxybenzoic acid, hydroxynaphthalene; polyvalent phenolic compounds such as catechol, resorcinol; and polymer compounds such as phenolic resin, polyphenol, poly(hydroxystyrene).

In addition, a phenolic compound represented by the following formula (<NUM>) can be used:
<CHM>.

Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, and t-amyl.

Examples of the alkenyl group include a substituent containing an unsaturated bond within the molecule of the above-mentioned alkyl group.

Examples of the cycloalkyl group include cyclopentaneand cyclohexane.

Examples of the alkylthio group include methylthio and ethylthio.

Examples of the aryl group include phenyl and naphthyl.

Examples of the alkylaryl group and the arylalkyl group include a substituent obtained by combining the alkyl group and the aryl group mentioned above.

Among these groups, as R, methyl or ethyl is preferable.

In addition, a phenolic compound represented by the following formula (<NUM>') can be used:
<CHM>
wherein in the formula, R is an alkyl group including <NUM> to <NUM> carbon atoms, an alkenyl group including <NUM> to <NUM> carbon atoms, a cycloalkyl group including <NUM> to <NUM> carbon atoms, an alkylthio group including <NUM> to <NUM> carbon atoms, an aryl group including <NUM> to <NUM> carbon atoms, an alkylaryl group including <NUM> to <NUM> carbon atoms or an arylalkyl group including <NUM> to <NUM> carbon atoms.

Specific examples of R in the formula (<NUM>') are the same as R in the formula (<NUM>).

The amount of the component (d) is preferably <NUM> to <NUM> parts by mass, more preferably <NUM> to <NUM> parts by mass, based on <NUM> parts by mass of the component (a).

The composition according to an aspect of the invention may contain one or more selected from the group consisting of an acidic substance and a salt of an acidic substance. The component is usually used as a heat-resistant stabilizing agent, and the heat resistance of the conductive film can be further improved.

The acidic substance may be any of an organic acid which is an acid of an organic compound and an inorganic acid which is an acid of an inorganic compound, and is preferably an organic acid. The acidic substance is preferably an organic acid containing one or more sulfonic acid groups.

The organic acid having sulfonic acid groups is preferably a cyclic, linear or branched alkyl sulfonic acid containing one or more sulfonic acid groups, a substituted or unsubstituted aromatic sulfonic acid, or a polysulfonic acid.

Examples of the alkylsulfonic acid include, for example, methane sulfonic acid, ethane sulfonic acidand di-<NUM>-ethylhexyl sulfosuccinic acid. Here, an alkyl group is preferably a linear or branched alkyl group including <NUM> to <NUM> carbon atoms.

Examples of the aromatic sulfonic acid include those including <NUM> to <NUM> carbon atoms, for example, a sulfonic acid containing a benzene ring, a sulfonic acid having a naphthalene skeleton, and a sulfonic acid having an anthracene skeleton. Further, examples of the aromatic sulfonic acids include a substituted or unsubstituted benzenesulfonic acid, a substituted or unsubstituted naphthalenesulfonic acid and a substituted or unsubstituted anthracenesulfonic acid.

Examples of the substituent include, for example, a substituent selected from the group consisting of an alkyl group (e.g., including <NUM> to <NUM> carbon atoms), an alkoxy group (e.g., including <NUM> to <NUM> carbon atoms), a hydroxy group, a nitro group, a carboxy group, and an acyl group, wherein one or more substituents may be substituted.

Specific examples of the aromatic sulfonic acid include a compound represented by the following formula (<NUM>) or (<NUM>):
<CHM>.

I is preferably <NUM> to <NUM>. m is preferably <NUM> to <NUM>. n is preferably <NUM> to <NUM>.

q is preferably <NUM> to <NUM>. p is preferably <NUM> to <NUM>. R is preferably an alkyl group including <NUM> to <NUM> carbon atoms, a carboxy group or a hydroxyl group.

Examples of the aromatic sulfonic acids include <NUM>-sulfophthalic acid, <NUM>-sulfoisophthalic acid, <NUM>-sulfosalicylic acid, <NUM>-naphthalenesulfonic acid, <NUM>-naphthalenesulfonic acid, <NUM>-hydroxy-<NUM>-naphthalenesulfonic acid, p-phenolsulfonic acid, toluenesulfonic acid, p-xylene-<NUM>-sulfonic acid, <NUM>,<NUM>'-biphenyldisulfonic acid, dibenzofuran-<NUM>-sulfonic acid, flavianic acid, (+)-<NUM>-camphorsulfonic acid, monoisopropylnaphthalenesulfonic acid and <NUM>-pyrenesulfonic acid. Among these, from the viewpoint of improving heat resistance, <NUM>-sulfophthalic acid, <NUM>-sulfosalicylic acid, <NUM>-sulfoisophthalic acid, <NUM>-naphthalenesulfonic acid, dibenzofuran-<NUM>-sulfonic acid, flavianic acid, <NUM>-hydroxy-<NUM>-naphthalenesulfonic acid and <NUM>-pyrenesulfonic acid are preferred.

Examples of the salt of the acidic substance include salts of the compounds mentioned above. Examples of the counter ion of the salt include sodium, lithium, potassium, cesium, ammonium, calcium and barium.

The amount of the component (e) is preferably <NUM> to <NUM> parts by mass, more preferably <NUM> to <NUM> parts by mass, and still more preferably <NUM> to <NUM> parts by mass, based on <NUM> parts by mass of the component (a).

The composition according to an aspect of the invention may include an acid having a hydrophobic group. The component is usually used as a penetration improver, and the composition can be more penetrated into an object (e.g., a capacitor).

Examples of the hydrophobic group include a linear alkyl group, a branched alkyl group, an alkylphenyl group, and an alkylnaphthyl group. The number of carbon atoms of the alkyl group contained in a linear alkyl group, a branched alkyl group, and an alkylphenyl group and an alkylnaphthyl group is preferably <NUM> to <NUM>.

Examples of the component (f) include an alkyl carboxylic acid, a phosphoric acid monoester, a phosphoric acid diester, an alkylbenzenecarboxylic acid, and an alkylbenzenephosphonic acid. Note that the alkylbenzenecarboxylic acid is a compound represented by R-Ph-COOH, and the alkylbenzenephosphonic acid is a compound represented by R-Ph-PO(OH)<NUM> (wherein in the formula, R represents an alkyl group, and Ph represents a phenyl group).

The number of carbon atoms of the alkyl group of an alkylcarboxylic acid and alkylbenzenephosphonic acids is preferably from <NUM> to <NUM>. The phosphoric acid monoester and the phosphoric acid diester are preferably esters obtained from phosphoric acid and an alcohol including <NUM> to <NUM> carbon atoms.

Examples of the component (f) specifically include propionic acid, DL-<NUM>-methyl butyric acid, <NUM>-methyl valeric acid, <NUM>-ethylhexanoic acid, <NUM>,<NUM>,<NUM>-trimethylhexanoic acid, myristic acid, monomethyl phosphoric acid, dimethyl phosphoric acid, mixture of monomethyl phosphoric acid and dimethyl phosphoric acid, monoethyl phosphoric acid, diethyl phosphoric acid, mixture of monoethyl phosphoric acid and diethyl phosphoric acid, monoisopropyl phosphoric acid, diisopropyl phosphoric acid, mixture of monoisopropyl phosphoric acid and diisopropyl phosphoric acid, monobutyl phosphoric acid, dibutyl phosphoric acid, mixture of monobutyl phosphoric acid and dibutyl phosphoric acid, mono(<NUM>-ethylhexyl) phosphoric acid, di(<NUM>-ethylhexyl) phosphoric acid, mixture of mono(<NUM>-ethylhexyl) phosphoric acid and di(<NUM>-ethylhexyl) phosphoric acid.

The amount of the component (f) is preferably <NUM> to <NUM> parts by mass, more preferably <NUM> to <NUM> parts by mass, based on <NUM> parts by mass of the component (a).

The composition according to an aspect of the invention may contain silica. By containing silica, the conductive film having further excellent heat resistance can be formed.

"Silica" means a silicon oxide containing silicon (Si) and oxygen (O), and includes not only compound represented by SiOx such as SiOz, but also a oligomer or polymer containing a siloxane bond (-O-Si-O-). Further, silica may be a hydrate or an anhydride.

The silica is preferably in a particle form, and may have a structure in which particles are linked in the form of a rosary. The mean particle diameter of the silica particles is preferably <NUM> to <NUM>. Silica particles in a colloidal state (colloidal silica) may be used.

The mean particle diameter of the silica particles is obtained by calculating the specific surface area by the BET method and converting from the specific surface area. The specific surface area is calculated by the BET method under the conditions described in JIS Z8830 (<NUM>).

Examples of commercially available products of silica include "ORGANOSILICASOL" series ("IPA-ST", "IPA-ST-ZL", "IPA-ST-UP") and "SNOWTEX" series manufactured by Nissan Chemical Corporation.

The amount of the component (g) is preferably <NUM> to <NUM> parts by mass, and may be from <NUM> to <NUM> parts by mass, based on <NUM> parts by mass of the component (a).

The composition according to an aspect of the invention may consist essentially of one or more components selected from the group consisting of components (a), (b), (c) and (d), and optionally (e) to (g). In this case, an unavoidable impurity may be contained.

For example, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, or <NUM>% by mass of the composition according to an aspect of the invention may be.

A conductive film can be formed by coating the composition according to an aspect of the invention on a substrate and drying it. The composition may be applied onto a substrate such as a glass, a resin film, a sheet, or a nonwoven fabric having a desired shape to form a conductive stacked body.

The thickness of the conductive film is usually <NUM> or less, preferably <NUM> to <NUM>.

As a method of applying the composition, a known method such as a casting method, a spraying method, a dip coating method, a doctor blade method, a bar coating method, a spin coating method, an electrospinning method, a screen printing, or a gravure printing method can be used.

Further, a step of immersing the conductive film (coating film) in a solution containing the above component (e) and drying may be provided. As the component (e) in this case, a sulfonic acid represented by the formula (<NUM>) or a salt thereof is preferred.

The solution for immersing may contain a solvent.

The solvent is not particularly limited as long as the component (e) is dissolved, and examples thereof include water, an alcohol-based solvent, a ketone-based solvent, an ether-based solventand an ester-based solvent. These solvents may be used alone or in combination of two or more.

Specific examples of the solvent include methanol, ethanol, isopropanol, n-butanol, <NUM>-methoxy-<NUM>-propanol, <NUM>-methoxy-<NUM>-butanol, <NUM>-methoxy-<NUM>-methyl butanol, <NUM>-ethoxy-<NUM>-propanol, ethyl acetate, butyl acetate, MIBK, methyl ethyl ketone (MEK), ethylene glycol mono tert-butyl ether, propylene glycol monomethyl ether acetate and dipropylene glycol monomethyl ether.

The amount of the component (e) in the immersing solution is preferably <NUM> to <NUM> parts by mass, more preferably <NUM> to <NUM> parts by mass, and still more preferably <NUM> to <NUM> parts by mass, based on <NUM> part by mass of the composition obtained by removing the solvent.

If the amount exceeds <NUM> parts by mass, an acidic substance may be excessive in a coating film, and as a result, deterioration of the polyaniline main chain may be caused, thereby reducing the conductivity.

Further, the component (e) is preferably <NUM>% by mass to <NUM>% by mass, more preferably <NUM>% by mass to <NUM>% by mass, and still more preferably <NUM>% by mass to <NUM>% by mass, in the immersing solution.

As the method for immersion, dipping can be given.

The immersion time is preferably <NUM> minute or more, more preferably <NUM> minutes or more and <NUM> minutes or less. The immersion temperature is preferably <NUM> to <NUM>.

It is preferred that drying after the immersion be conducted by using an oven or a hot plate.

The drying temperature is preferably <NUM> to <NUM>, more preferably <NUM> to <NUM>.

The drying time is preferably <NUM> to <NUM> minutes, more preferably <NUM> to <NUM> minutes. If necessary, heating may be performed under reduced pressure. The drying temperature and the drying time are not particularly limited, and may be appropriately selected according to the materials used.

As described above, the component (e) may be added in the above composition or may be contained in a conductive film obtained from the composition. The component (e) may be added into the composition, and the component (e) may be also contained in the conductive film obtained from the composition.

In other words, the conductive film according to an aspect of the invention may contain a component (e) added prior to film formation (hereinafter, sometimes referred to as a component (e1)) and a component (e) added after film formation (hereinafter, sometimes referred to as a component (e2)). The components (e1) and (e2) may be the same or different. When the components (e1) and (e2) are different, for example, the component (e1) is a compound represented by the formula (<NUM>), and the component (e2) is a compound represented by the formula (<NUM>).

The conductive film according to an aspect of the invention contains (a) a conductive polymer and (b) a resin having a solubility parameter of <NUM> to <NUM> MPa<NUM>/<NUM> [<NUM> to <NUM> (cal/cm<NUM>)<NUM>/<NUM>], further comprising one or more selected from the group consisting of (e) as described above (one or more selected from the components (e1) and (e2)),.

The conductive film described above may consist essentially of components (a) and (b) and a component (e). In this case, an unavoidable impurity may be contained.

For example, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, <NUM>% by mass or more, or <NUM>% by mass of the conductive film described above may be
components (a), (b), and (e).

The conductivity of the conductive film described above is preferably <NUM>/cm or more, more preferably <NUM>/cm or more, and still more preferably <NUM>/cm or more.

The conductivity of the conductive film is measured by the method described in Examples.

Note that each component in the conductive film described above are as described in the composition according to an aspect of the invention.

Also, the above-mentioned components (a) to (g) are different from each other.

A capacitor can be manufactured using the composition according to an aspect of the invention. Examples of the capacitor specifically include an electrolytic capacitor and an electric double layer capacitor, and examples of the electrolytic capacitor include a solid electrolytic capacitor.

When manufacturing a solid electrolytic capacitor, for example, the process contains the steps of immersing a anode body containing a anode and a dielectric material of the solid electrolytic capacitor with the composition of the invention, and drying to form a conductive film on anode body. That is, the solid electrolytic capacitor contains the conductive film of the invention.

The capacitor according to an aspect of the invention is excellent in heat resistance and moisture resistance, and therefore is extremely useful, for example, when used for an in-vehicle application or a circuit substrate of a communication base station. Vehicles such as automobiles may be placed in a harsh environment of high temperature and high moisture. Further, since the circuit substrate of a communication base station may be heated to a high temperature due to electronic devices such as a power amplifier, the capacitor used in these devices is required to have a predetermined heat resistance and moisture resistance, and the above-mentioned capacitor can satisfy the requirement.

A conductive stacked body containing a conductive film can be manufactured by coating the composition according to an aspect of the invention on a substrate such as a glass, a resin film, a sheet or a nonwoven fabric having a desired shape, and removing a solvent. The conductive stacked body can be processed into a desired shape by a known method such as vacuum molding or pneumatic molding to produce a conductive article. From the viewpoint of molding, a resin film, a sheet or a nonwoven fabric is preferred as the substrate.

As a method for applying the composition to the substrate, a known method such as a casting method, a spraying method, a dip coating method, a doctor blade method, a bar coating method, a spin coating method, an electrospinning method, a screen printing method, and a gravure printing method can be used. When the above coating film is dried, the coating film may be heated depending on the type of solvent. For example, the conductive film is heated at a temperature of <NUM> or less, preferably <NUM> or more and <NUM> or less, under an air stream, and further, if necessary, heated under reduced pressure. The heating temperature and the heating time are not particularly limited, and may be appropriately selected according to the materials used.

It should be noted that the composition according to an aspect of the invention can also be used to manufacture a self-supporting molded body without a substrate.

<NUM> of "Neocol SWC" (sodium di-<NUM>-ethylhexylsulfosuccinate, manufactured by DKS Co. ), <NUM> of aniline, <NUM> of "Sorbon T-<NUM>" (a nonionic emulsifier having a polyoxyethylene sorbitan fatty acid ester structure, manufactured by Toho Chemical Industry Co. ) was placed in a <NUM>,<NUM> separable flask and dissolved by <NUM> of toluene. <NUM> of <NUM>% by mass aqueous solution of a phosphoric acid was added thereto, and the reaction solution having two liquid phases of toluene and water was stirred, and the internal temperature of the reaction solution was cooled to -<NUM>. When the internal temperature of the reaction solution reached -<NUM>, while stirring the reaction solution, a solution in which <NUM> of APS (ammonium persulfate) was dissolved in <NUM> of <NUM>% by mass aqueous solution of phosphoric acid was dropped over <NUM> hours using a dropping funnel. After completion of dropping, the solution was further stirred for <NUM> hours while keeping the internal temperature of the solution at -<NUM> (total reaction time of <NUM> hours). After the stirring was stopped, the contents were transferred to a separatory funnel, and the water phase and the toluene phase were statically separated. After separating, a toluene solution of a polyaniline complex was obtained by washing the toluene phase once with <NUM> of <NUM>% by mass aqueous solution of phosphoric acid, and washing <NUM> times with <NUM> of ion-exchanged water. This solution was filtered through a filter paper of No. <NUM> to remove insoluble content, and a toluene solution of a polyaniline complex soluble in toluene was collected. This solution was transferred to an evaporator, warmed in a water bath at <NUM>, and evaporated to remove volatile content by reducing pressure to obtain a polyaniline composite <NUM> (protonated polyaniline). The weight-average molecular weight of polyaniline of the polyaniline complex <NUM> was <NUM>,<NUM>.

The weight-average molecular weight of polyaniline was measured as follows.

<NUM> of the polyaniline complex was dissolved in <NUM> of toluene, and <NUM> of a <NUM> aqueous solution of sodium hydroxide was added thereto, and stirred for <NUM> minutes, followed by suction filtration. The obtained residue was washed <NUM> times with <NUM> of toluene, <NUM> times with <NUM> of ion-exchanged water, and <NUM> times with <NUM> of methanol, and the obtained solid content was dried under reduced pressure, and the weight-average molecular weight of the obtained polyaniline was measured by a gel permeation chromatograph (GPC).

The GPC measurement was performed using GPC column (two "ShodexKF-<NUM>" manufactured by Showa Denko K. ) under the following measurement conditions.

The weight-average molecular weight obtained by the above method is a polystyrene (PS) equivalent value.

In addition, the doping ratio of the proton donor (sodium di-<NUM>-ethylhexylsulfosuccinate) based on polyaniline was <NUM>.

<NUM> of isopropyl alcohol, <NUM> of tert-amylphenol (Component (d)) and <NUM> of hexane were stirred and mixed until uniform to prepare a mixed solvent A. <NUM> of the polyaniline complex <NUM> and <NUM> of "S-LEC B BX-<NUM>" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), I = about <NUM> mol%, m = <NUM> mol% or less, n = <NUM>±<NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa1/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC B BX-<NUM>") were dissolved in <NUM> of the mixed solvent A to obtain a polyaniline complex solution. <NUM> of <NUM>-naphthalenesulfonic acid hydrate was added to this solution to prepare a composition.

The SP value δ of "S-LEC B BX-<NUM>" was calculated by <NPL>. Specifically, the calculation was performed using the following formula (A): <MAT> wherein in the formula (A), Δei represents the aggregation energy density of the functional group in the molecular structure, and Δvi represents the molar molecular weight.

<NUM> of the above-mentioned composition was applied to the upper surface of a glass substrate <NUM> on which an ITO electrode <NUM> was formed thereon by patterning shown in <FIG>. The application was performed by a spin coating method in an atmosphere. The rotating time of the glass substrate <NUM> after dropping the composition was <NUM> seconds and the rotating speed of the glass substrate <NUM> was <NUM> rpm. Thereafter, the glass substrate <NUM> was dried to form a conductive film. The drying temperature was <NUM>, and the drying time was <NUM> minutes.

<NUM> of <NUM>% by mass of an aqueous solution of <NUM>-sulfophthalic acid (manufactured by Tokyo Chemical Industry Co. ) was dissolved in <NUM> of isopropanol (manufactured by Wako Pure Chemical Industries, Ltd. ) to obtain a uniform <NUM>% by mass solution of <NUM>-sulfophthalic acid. The above conductive film was immersed in <NUM> of this <NUM>-sulfophthalic acid solution for <NUM> minutes. After immersion, the conductive film was dried for <NUM> minutes at <NUM>, followed by drying at <NUM> for <NUM> minutes.

As shown in <FIG>, the portion of the obtained conductive film <NUM> covering the terminal of the ITO electrode was scraped off under an atmosphere to expose the terminal of the ITO electrode <NUM> to the surface. Using the ITO electrode <NUM> exposed on the surface, the resistance (initial resistance R0) and the conductivity of the conductive film was measured by a resistivity meter "Loresta-GP" (manufactured by Mitsubishi Chemicals Corporation) using the four-terminal sensing. The results of conductivity are shown in Table <NUM>.

The conductive film whose initial resistance R0 was measured as described above was left as the glass substrate for a predetermined period of time (the number of elapsed days shown in Table <NUM>) under the conditions of <NUM> in the atmosphere. After the predetermined period of time had elapsed and the temperature of the conductive film back to room temperature, the resistance R was measured in the same manner as the initial resistance R0. The ratio of R to R0 (R/R0) is shown in Table <NUM>. From the ratio (R/R0), the surface resistivity increase rate of the conductive film, i.e. the degree of degradation over time can be obtained.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that the added amount of "S-LEC B BX-<NUM>" was changed to <NUM>. The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC K KS-<NUM>" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), l = <NUM>±<NUM> mol%, m = <NUM> mol% or less, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM>,<NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC K KS-<NUM>"), and the added amount was changed to <NUM>. The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that the added amount of "S-LEC K KS-<NUM>" was changed to <NUM>. The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BX-L" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), I = about <NUM> mol%, m = <NUM> mol% or less, and n = <NUM>±<NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC B BX-L"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC K KS-<NUM>" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), l = <NUM>±<NUM> mol%, m = <NUM> mol% or less, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC K KS-<NUM>"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC K KS-5Z" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), l = <NUM>±<NUM> mol%, m = <NUM> mol% or less, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC K KS-5Z"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC K KS-6Z" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), I = about <NUM> mol%, m = <NUM> mol% or less, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC K KS-6Z"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BH-S" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), l = <NUM>±<NUM> mol%, m = <NUM> to <NUM> mol%, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC B BH-S"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BM-S" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), l = <NUM>±<NUM> mol%, m = <NUM> to <NUM> mol%, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC B BM-S"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BL-S" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), l = <NUM>±<NUM> mol%, m = <NUM> to <NUM> mol%, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC B BL-S"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BL-<NUM>" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), I = <NUM>±<NUM> mol%, m = <NUM> mol% or less, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC B BL-<NUM>"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BM-<NUM>" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), l = <NUM>±<NUM> mol%, m = <NUM> mol% or less, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM>, molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC B BM-<NUM>"). The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BH-<NUM>" (alkyl acetalized polyvinyl alcohol (the compound represented by the formula (b2), I = <NUM>±<NUM> mol%, m = <NUM> mol% or less, and n = about <NUM> mol%), manufactured by SEKISUI CHEMICAL CO. , SP value: <NUM> MPa<NUM>/<NUM> [<NUM> (cal/cm<NUM>)<NUM>/<NUM>], molecular weight: <NUM>×<NUM><NUM>, hereinafter referred to as "S-LEC B BH-<NUM>"). The results are shown in Table <NUM>.

<NUM> of isopropyl alcohol, <NUM> of <NUM>-isopropylphenol (a component (d)), and <NUM> of hexane were stirred and mixed until uniform to prepare a mixed solvent B. <NUM> of the polyaniline complex <NUM> and <NUM> of "S-LEC B BX-<NUM>" were dissolved in <NUM> of the mixed solvent Bto obtain a polyaniline complex solution. <NUM> of <NUM>-naphthalenesulfonic acid hydrate was added to this solution to prepare a composition.

For the obtained composition, a conductive film was prepared and evaluated in the same manner as in Example <NUM>. The results are shown in Table <NUM>.

<NUM> of DL-<NUM>-methyl butyric acid, <NUM> of isopropyl alcohol, <NUM> of p-tert-amylphenol (a component (d)), and <NUM> of hexane were stirred and mixed until uniform to prepare a mixed solvent C. <NUM> of the polyaniline complex <NUM> and <NUM> of "S-LEC B BX-<NUM>" were dissolved in <NUM> of the mixed solvent C to obtain a polyaniline complex solution. <NUM> of <NUM>-naphthalenesulfonic acid hydrate was added to this solution to prepare a composition.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was not added. The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was not added. The results are shown in Table <NUM>.

<NUM> of the polyaniline complex <NUM> and <NUM> of "S-LEC B BX-<NUM>" were dissolved in <NUM> of the mixed solvent A to obtain a polyaniline complex solution. <NUM> of <NUM>-naphthalenesulfonic acid hydrate was added to this solution to prepare a composition. A conductive film was prepared and evaluated in the same manner as in Example <NUM>, except that (immersing treatment of the conductive film) was not performed. The results are shown in Table <NUM>.

A composition and a conductive film prepared and evaluated in the same manner as in Example <NUM>, except that the added amount of "S-LEC B BX-<NUM>" was changed to <NUM>. The results are shown in Table <NUM>.

<NUM> of the polyaniline complex <NUM> and <NUM> of "S-LEC B BX-<NUM>" were dissolved in <NUM> of the mixed solvent B to obtain a polyaniline complex solution. Using the obtained composition, a conductive film was prepared and evaluated in the same manner as in Example <NUM>. The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC K KS-<NUM>". The results are shown in Table <NUM>.

<NUM> of the polyaniline complex <NUM> and <NUM> of "S-LEC B BX-<NUM>" were dissolved in <NUM> of the mixed solvent A to obtain a polyaniline complex solution. <NUM> of <NUM>-naphthalenesulfonic acid hydrate was added to this solution to prepare a composition.

Using the obtained composition, a conductive film was prepared in the same manner as in Example <NUM>, except that a glass substrate on which an ITO electrode was not formed on the surface was used and the rotation speed of the glass substrate was <NUM> rpm. In addition, the same treatment as that of Example <NUM> (immersing treatment of the conductive film) was performed. The surface resistance (initial surface resistance R'<NUM>) of the obtained conductive film was measured by a resistivity meter "Loresta-GP" (manufactured by Mitsubishi Chemicals Corporation) using the four-terminal sensing.

Further, using the composition obtained above, the conductivity of the conductive film was evaluated by performing the same operation as in Example <NUM>. The results of conductivity are shown in Table <NUM>.

The conductive film whose initial surface resistance R'<NUM> was measured as described above was left as the glass substrate for a predetermined period of time (the number of elapsed days shown in Table <NUM>) under the conditions of <NUM> and <NUM>%RH in the atmosphere. After the predetermined period of time had elapsed and the temperature of the conductive film back to room temperature, the surface resistance R' was measured in the same manner as the initial surface resistance R'<NUM>. The ratio of R' to R'<NUM> (R'/R'<NUM>) is shown in Table <NUM>. From the ratio (R'/R'<NUM>), the surface resistivity increase rate of the conductive film, i.e. the degree of degradation over time can be obtained.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BL-<NUM>". The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BX-L". The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC B BH-<NUM>". The results are shown in Table <NUM>.

A composition and a conductive film were prepared and evaluated in the same manner as in Example <NUM>, except that "S-LEC B BX-<NUM>" was changed to "S-LEC K KS-5Z". The results are shown in Table <NUM>.

From the above Examples, it can be seen that a conductive film excellent in heat resistance and moisture resistance can be produced by the composition according to an aspect of the invention. When such a conductive film is used for a capacitor, for example, heat resistance and moisture resistance of the capacitor itself are improved, so that such a capacitor is extremely useful, for example, when used for an in-vehicle application or a circuit substrate of a communication base station.

Claim 1:
A composition comprising:
(a) a conductive polymer,
(b) a resin having a solubility parameter of <NUM> to <NUM> MPa<NUM>/<NUM> [<NUM> to <NUM> (cal/cm<NUM>)<NUM>/<NUM>],
(c) a solvent, and
(d) a phenolic compound,
wherein the component (a) comprises one or more selected from the group consisting of polyaniline, polyaniline derivatives, polythiophene, polythiophene derivatives, polypyrrole and polypyrrole derivatives,
the component (b) is a polyvinyl acetal resin,
the amount of the component (b) is <NUM> to <NUM>% by mass based on the amount of the component (a), and
the phenolic compound is a compound represented by ArOH, wherein Ar is an aryl group or a substituted aryl group.