JPS61287971A - Electrically conductive ink and production thereof - Google Patents

Abstract

PURPOSE:To easily produce an electrically conductive ink having a desired electrical conductivity, by blending a specified material and resin with an acetylene compd. polymer from which a catalytic component has been removed. CONSTITUTION:A polymer mixture (A) having an ash content of 5wt% or below is obtd. by polymerizing an acetylene compd. (e.g. methylacetylene) in the presence of a metallic compd. catalyst [e.g. Ti(OR4)+Al(C2H5)3 wherein R is alkyl or an arom. residue] in an inert org. solvent (e.g.gasoline) and removing the catalytic component from the resulting polymer dispersion. Component A, at least one member (B) selected from among oxidizing agent (e.g. O3), reducing agent (e.g. hydrazine), acidic material (e.g. PF5), basic material (e.g. KOH) and electrically conductive powder (e.g. graphite) and 5-50wt% (based on the quantity of component A) resin (C) (e.g. phenolic resin) are dissolved or dispersed in a diluent (e.g. toluene).

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a new conductive ink containing a polymer of acetylene compounds, and the coating film, contact 9 pattern, etc. obtained by coating, printing, etc. with this ink. It has good conductivity and has an extremely wide range of applications in electrical appliances, electronic products, industrial products, daily necessities, etc. as antistatic materials, etc.

[Prior Art] and [Problems to be Solved by the Invention] Many patents have been published regarding what are called conductive inks or conductive paints, but most of them are based on graphite powder or metal powder. is dispersed in a resin solution as a filler. However, their dispersibility is very poor, and many of them are difficult to coat or print. In this regard, the present inventors have focused their efforts on developing a conductive ink that has good dispersibility, is easy to form a coating film and two contact patterns, and has stable conductivity, and has finally completed the present invention. .

Examples of liquid materials containing polymers of acetylene compounds include size liquids in which acetylene is graft-polymerized or block-polymerized to polybutadiene in the presence of a Ziegler-Natsuta catalyst, and dispersions in which urethane-based polydiacetylene is polymerized. Although these have been reported, they are all expensive and have not appeared on the market as general-purpose products, and according to the inventors' follow-up experiments, none of them had practical use as inks. be. The present inventors have conducted various studies to eliminate these drawbacks, and have completed the present invention, which is easy to manufacture industrially and is also economically advantageous.

[Means for solving problems]

The present invention relates to a new conductive ink and a method for producing the same, and it has been clarified that conductive ink with a wide range of applications can be easily provided in large quantities.

The present inventors added oxidizing agents, reducing agents, acidic substances, basic A conductive ink comprising at least one substance selected from the group consisting of a substance or a compound thereof and a conductive powder, and a resin in an amount corresponding to 5 to 50% by weight of the polymer, and the manufacture thereof. He invented a method to do so.

Inert organic solvents include petroleum-based saturated hydrocarbons (e.g., paraffinic hydrocarbons, naphthenic hydrocarbons, etc.), aromatic hydrocarbons (e.g., benzene, toluene, etc.).

xylene, ethylbenzene, polymethylbenzene.

naphthalene, methylnaphthalene, biphenyl, methylbiphenyl, etc.), ethers (e.g. dialkyl ethers,
Cyclic ethers, acetals, ketals, diphenyl ethers, dibenzyl ethers.

glycol ether, etc.), organosilicon compounds (e.g. silicone oil, silicate ester, etc.), halogenated hydrocarbons (e.g. dichloride methane, polyhalomethane, polyhaloethane, polyhalopropane, polyfluorohydrocarbon, perfluorohydrocarbon, etc.) alone or a mixture of two or more, and industrially advantageous solvents include petroleum naphtha, gasoline, petroleum ether, petroleum benzene, ligroin, kerosene, light oil,
Liquid paraffin, mineral spirit cracked gasoline, aromatic solvent, BTX solvent, methylene chloride, freon, etc.

Acetylene compounds are monomers containing one ethynyl group in the molecule, such as acetylene, methylacetylene, butyne, phenylacetylene, propargyl alcohol, and propargyl ester, either singly or as a mixture of two or more, and are pure products. Even if it is an impure product (there is no problem even if a small amount of olefin compound, diacetylene compound, saturated compound, etc. are mixed), it is useful as a raw material for the present invention. Particularly industrially advantageous are acetylene,
There are methylacetylene and phenylacetylene, and there are various types of industrial grade products (many of which contain polymerization inhibitors as impurities, but these are removed before use) .

The metal compound catalyst referred to in the present invention is titanium.

Catalysts in the form of single compounds or complex compounds containing transition metal elements such as zirconium, vanadium, chromium, iron, cobalt, nickel, molybdenum, tungsten, cerium, neodymium, niobium, tantalum, tin, and palladium. is effective, and if the chemical formula of a typical catalyst component is shown, Ti(OR)4+ A
IR:+, Nd(OCOR):+ +A I R31N
d (OR), l+A I R, l+ llCl 6
+ WCl b ” SnRl+ MoC15+Mo
Cl5+SnL+ WCIb+HtO, MQC1s+H
zO, RCr(Co)3°RMo(Co)3. RW(
CO)i, NiBr2 +2PR31Ni12+2P
Ri.

CoBrg + 2PRff, CoIz + 2PR
3.Co(NOff)! + NaBH41NiC]4
+ NaBH4, etc. (R in the above formula is an alkyl group or an aromatic residue, and these may be the same or different, but it is better that they are not unnecessarily large atomic groups)
.

Among the above, the catalyst that is easy to use industrially is Ti (OR).
a+ AI(CzHs)z, Nd(OCOR)s+
AI(CJs)z, N1Brz”2P(CJs)*1
Co(NO3)z + NaBH4, NiC1z +
Such as NaBH4. Strictly speaking, it is natural that the reaction conditions will differ depending on the type of catalyst, and the fine structure of the polymer will also differ, but the common thing about the reaction products is that they range from brown to blue-purple to black. It is a fine polymer having a large number of conjugated double bonds and has the appearance of a mixture of powder, gel, or sol dispersed in an inert organic solvent. In addition, if the polymer in this dispersion mixture has absorbed a large amount of solvent or catalyst, or has bonded with it, it will be in a swollen form, and it will have a colored gel-like or sol-like appearance. ,
In cases where the degree of swelling is small or no solvent is contained at all, it becomes a filamentous to crystalline to amorphous colored powder and is dispersed and mixed in the solvent. In either case, by removing the above-mentioned catalyst from the polymer dispersion mixture by the method described later, the colored powder is suspended or partially precipitated in the solvent, resulting in a suspended state or a paste-like state. It becomes a mixture.

Removal of this catalyst component is generally carried out by solvent extraction, acid dissolution, or
This is achieved by operations such as ion adsorption or filtration. The colored mixture from which part, most or all of the catalyst components have been removed in this way has semiconductor to conductor properties, but does not have the performance as a conductive ink at this point. Therefore, an amount of resin corresponding to 5 to 50% by weight, preferably 10 to 40% by weight of the polymer in the mixture obtained by the above method is added to provide a function as a binder for ink to form an ink. It will be done. When making this ink, depending on the type and amount of additives, mixing operations are performed according to the type of organic solvent and the amount of mixing is adjusted in order to adjust the concentration of solids in the ink and maintain the ink condition. It is necessary to. In carrying out this adjustment step, it is important to mix some substances as described below and the following resins to improve the conductivity and ink forming ability of the polymer.

In other words, the resin referred to in the present invention may be a thermoplastic resin or a thermosetting resin, but when forming the conductive ink, a considerable portion of the resin is dissolved or dispersed in a solvent, and the resin has poor viscosity and adhesive properties. It is necessary to have the following. In practice, resins that are thermoplastic or have a considerable amount of thermoplasticity are used, and these liquids can be dried, cured by heating, crosslinked with a catalyst or oxygen, irradiated with electron beams, etc. It is made to solidify by means such as curing with , and there are some that solidify like a true melt, especially when the amount of solvent is extremely small. It's not like this.

There is no problem with the present invention even if the thermosetting resin is completely or completely solidified, and this is often the case. Typical resins are polyolefin, rubber, polyhinyl chloride, chlorinated polyolefin, polyvinyl acecool, polyvinyl acetate, polyvinyl chloride-vinyl acetate, polyterpene,
Polyacrylonitrile type, polyacrylate type, polymethacrylonitrile type, polymethacrylate type.

Unsaturated polyester type, polyamide type, polyallyl ester type, polyurethane type, cellulose derivative type.

Starch derivative type, polystyrene type, polyester type, polyether type, polyether ester type.

Resins such as polysulfone, melamine/formalin, urea/formalin, phenol/polmarin, alkyd, coumaronindene, epoxy, polyimide, aromatic hydrocarbon/polmarin, and various copolymers related to these. Either a combination or a composite can be used. Among these, the industrially important ones are rubber-based (polybutadiene copolymerized with acetylene may also be used).

Polyvinyl chloride type, chlorinated polyolefin type, polyvinyl acecool type, polyvinyl acetate type, polyvinyl chloride-
Vinyl acetate type, polyacrylate type.

Modified resins for use in polymethacrylate, polyamide, polyurethane, polystyrene, epoxy, phenol/formalin, and related binders.

From the viewpoint of conductivity, it is of course better to use a smaller amount of resin for these binders, but in order to form a conductive ink, as mentioned above, 5 to 5
0% by weight. This usage amount is 5% by weight.
In the following, even if the molecular weight is increased considerably, it can still be effective as a binder, but poor adhesion will actually lead to a decrease in conductivity, and 5
If the amount is more than 0% by weight, the electrical resistance of the binder itself will increase and the quality of the conductive ink will be significantly impaired.
should be limited to

Next, at least one substance selected from the group consisting of an oxidizing agent, a reducing agent, an acidic substance, a basic substance or a compound thereof, and a conductive powder as a compounding agent according to the present invention is the compounding agent according to the present invention. It refers to materials that are blended to improve or adjust the conductivity or stability of polymers, or to make them economical without significantly increasing electrical resistance. First, the oxidizing agent.

Reducing agents, acidic substances, basic substances, or their compounds may act as dopants, ionic conductors, ionic radical salts, or It is necessary to select the type depending on the case where the compound is to function as a charge transfer complex, and this can be selected according to the usage of known conductive synthetic compounds.

Typical oxidizing agents are oxygen (air), nitrogen oxide, ozone 2 halogen (C121Brz+ IZ+ ICI:
Typical reducing agents are hydrazine, sulfur dioxide, metal hydrides (NaBH4, LiAlH4, NaH, KH, Li
ft, CaHz+NaNH=), etc. A typical acidic substance is Lewis acid (PFst AsF5.
SbF3.5bFs+ 5bCIs, BiFs+B
F3゜TaF5. MoFs, 11'F5. RuF
5. BClj, BBr3. SO:++T3C1t
+5nC1,,^+ch, FeCl3. MoCl5
．． WCl5+TeCl4, 5eC1*+5eRrn,
TeBr, TaBr5. Te1t+ TaCl5
1NbC1s, HfC1*.

ZrCL, NbFs) and Brønsted acid (H
P.

HCL HBr, old, HBFn, HtSOn, HCl
0n, FSOJ, Cl5OJ.

CH35O3H, CF35OJ+ HPF6. H.A.S.
F61 H5bFb, HNO3゜1 (3PQ4.H
zTiF6. HJrF6. HJbF6. HzTa
Fb+HAIC1a.

HFeC14), and other acidic substances include tetracyanoethylene, tetracyanoquinodimethane, chloranil, xenon fluoride, xenon xyfluoride, and nitronium fluoroborate.

Examples include nitrosofluoborate, nitronium fluorantimonate, and nitrosochlorantimonate. Typical basic substances include alkali metals (t, i,
Nat K, Rb, Cs,), alkali alcoholade (L10CH31Na0CHz, Kocn2.
LtOCJs.

Na0Czl(s, KOCzHs, KOC4T
o-t, Na0CHzCHzONa+KOCHzGH
zOK+ Na, 0CbH5+ KOCaHs) r
Alkali hydroxide (NH40)1. C30H, KOH,
NaOH, Li0H), alkali carbonate (Na0CH
z, KzCOi, C5zCOz) + 77 7
) Lt-hli (NaHPz, KFKHh+ CsF
, NH4HFz), quaternary ammonium compound,
Quaternary phosphonium compound.

Sulfonium compounds, alkyl lithium, phenyl lithium, naphthalene potassium, tertiary amines.

Crown ether, phthalocyanine, tetrathiafulvalene, tetramethyltetrathiafulvalene.

Examples include tetraselenafulvalene and tetramethyltetraselenafulvalene. Further, these compounds are equimolar or non-equimolar compounds of each of the above compounds, and include charge transfer complexes. Conductive powders include carbon black, graphite, black phosphorus, and polyacetylene film waste.

Polyparaphenylene, polyparaphenylene sulfide,
Poly (thio-2,8-dibenzothiophene), poly
(Thio-3,7-benzothiophene).

Polyacene, polyacenequinone, polyarylene vinylene, polydiacetylene, polythiophene, polypyrrole,
Polyvinylpyridine, polycopper phthalocyanine, polyvinylferrocene, polythiazyl.

Polyvinyl carbazole, synthetic resin carbide, polyaniline, aniline black, coke, carbon fiber, tin oxide, indium oxide, zinc oxide, aluminum, copper, chromium, manganese, iron, cobalt.

These include nickel, silver, gold, platinum, palladium, and mineral powders and synthetic resin powders on which the above metals or oxides of the above metals are attached. The shape of the conductive powder may be acicular, columnar, plate-shaped, monospherical, irregular, or a mixture thereof, and any of these may be used in the present invention. Among these, the ones that are used industrially at low cost are carbon blanks, aniline black, graphite, borobara phenylene, and polyacetylene film scraps.

These are powders such as synthetic resin carbide, and they can be either crystalline or amorphous powders.

The method of the present invention involves first preparing a dispersion mixture of a polymer obtained by reacting an acetylene compound with a metal compound catalyst in an inert organic solvent, and then removing unnecessary catalyst therefrom. In general, in the solution polymerization of acetylene compounds, unlike in the synthesis of other polyolefins, the amount of catalyst used is usually abnormally large compared to the monomer.
In such a case, the polymer is collected or concentrated from the polymer dispersion mixture by filtration, centrifugation, or sedimentation, and then the catalyst is removed by a mechanical method such as washing with a solvent. However, it is not easy to completely remove catalysts or catalyst fragments that are adsorbed or bonded to polymers using only this method. %
It often contains the following amount of ash: 4. In the case of polyacetylene, catalyst removal is hydrohalic acid, hydrofluoroboric acid, oxygenated halogen acid, acetic acid, and formic acid.

The catalyst is dissolved and washed with a solvent containing active hydrogen such as trifluoroacetic acid, phenol, alcohol, acetylacetone, and ethyl acetoacetate.As a pretreatment, unreacted catalyst is extracted and removed as thoroughly as possible using an inert solvent. These methods can reduce the natural content in polyacetylene to 0.01 to 2.00%. Carbon black powder is generally known as a conductive filler.

As mentioned above, graphite powder and metal powder are very difficult to disperse in the ink base compared to other ink dyes and pigments, but the freshly prepared acetylene compound polymer according to the present invention is homogeneous and disperses in the ink base. It has the advantage of being easily dispersed or redispersed stably, and mixtures containing it are convenient for making high-quality conductive inks.

The conductive ink referred to in the present invention is a baking type of various grades ranging from conductive paint type to low viscosity conductive solution type, room temperature drying type, heat drying type, as well as solvent type, water based type, and hot melt type. It includes liquid to fluid to semi-solid products, and whether it is a paint or an ink depends on the particle size and content of solid substances contained in the product, and the viscosity of the product.

They are only distinguished by their flow state, etc., and the components,
There is no fundamental difference in conductivity or usage. Therefore, it is natural that one type of conductive ink of the present invention includes conductive paint.

Next, in order to further clarify the technical aspects of the present invention, polyacetylene will be explained below as an example. A reaction vessel is charged with an inert solvent, triethylaluminum, and tetrabutoxytitanium, the mixture is cooled, and acetylene gas is blown into the reaction vessel to continue the reaction for several hours, and then the reaction mixture is allowed to reach room temperature. After removing most of the solvent and catalyst from the thus obtained black polyacetylene dispersion solution by centrifugation, toluene is added to the polyacetylene and mixed, and the toluene is removed by centrifugation again. The polyacetylene powder obtained by repeating this operation several times is used dry or undried.

For example, when a toluene dispersion of polyacetylene powder is washed with concentrated fluoroboric acid while cold, most of the remaining catalyst components are removed, and the resulting polyacetylene is appropriately doped and conductive. Mixtures containing powders can be mixed. By concentrating this mixture under reduced pressure, a liquid or paste containing the desired polyacetylene can be obtained. For example, graphite powder and a resin binder are added to such a mixture and mixed thoroughly, and then antioxidants and the like are added to stabilize the quality of the ink, and if necessary, diluted with thinner to the extent that it can be used as an ink. Adjust the concentration of solids so that Of course, depending on the purpose of use, the above-mentioned graphite powder may not be added or may be replaced with other fillers to adjust the conductivity of the ink.

In such cases, phenolic resins and epoxy resins are used as resin binders for baking inks.

It is convenient to use urethane resin, and for screen printing ink, phenol resin, epoxy resin, acrylic resin, rubber resin, etc. are preferably used. Furthermore, acrylic resins, vinyl resins, rubber resins, cellulose resins, etc. are used for room-temperature drying inks, and acrylic resins, epoxy resins, phenolic resins, diallylphthalate resins, unsaturated resins, etc. are used for heat-drying inks. Polyester resin, melamine resin, furan resin, urethane resin, etc. are used.

Water-based or emulsion type inks include cellulose resins, starch resins, acrylic resins, phenolic resins,
Melamine resin, vinyl resin, styrene resin, maleic acid resin, etc. are used.

The conductivity of the conductive ink of the present invention prepared as described above can be changed depending on the type and solid content of the ink solid and the properties and amount of the binder used. For example, the surface conductivity of a conductive film formed by forming a coating film on the surface of a plastic film by screen printing using the conductive ink of the present invention can be determined from its electrical resistance value. When using the conductive ink of the present invention, the conductivity can be arbitrarily set in a wide range such that the resistance value is ρ = 0.1 to 50,000Ω/mouth (solid content is 20 to 80% by weight). be. For comparison, we formed a coating film in the same way using a conventional commercially available conductive ink for Nuclean printing, and found that the resistance value generally ranged from ρ-10 to 10,000 Ω/mouth, especially when ρ= Effectively producing coatings of less than 10 Ω/mouth becomes quite uneconomical. However, when using the product of the present invention, if ρ = 1Ω/or less, ρ = 5000
Even in the case of 0Ω/mouth or more, it has the advantage that the conductivity can be easily adjusted by changing the blending of the components.

The present inventors have conducted numerous experiments regarding the present invention as described above, and have confirmed its superiority.In order to further explain the technical content of the present invention, we will present several representative examples among the numerous experimental examples. Selected examples will be shown below as examples.

〔Example〕

Example 1 Tetrabutoxytitanium (0,05 mol), triethylaluminum (0,20 mol) and biphenyl (20,
After cooling and solidifying the mixture (0 mol), the mixture was ground, and this powder was added to 2000 ml of liquid propane at -80°C. dispersed into Add acetylene to this dispersion mixture at 10% per hour.
00m7! Let it circulate for 3 hours at a rate of . During this time, the temperature of the mixed solution is maintained at -50° C. or less, and after 3 hours, unreacted acetylene is expelled from the blackened reaction mixture using nitrogen gas. Next, the same amount of toluene was added to the reaction mixture, warmed to room temperature to remove propane, and the black precipitate was filtered off. After thoroughly washing this black precipitate with a mixture of toluene and methanol to remove catalyst residue, indium chloride
% methanol solution and left overnight. The polyacetylene thus obtained is doped with indium chloride, and when washed with methanol and dried, it becomes an electrically conductive powder. 5g of this conductive powder.

A conductive ink is prepared by mixing 2 g of vinyl chloride/vinyl acetate copolymer resin and 20 g of toluene in a vibrating mixing container. The resulting ink was applied in black color onto a glass plate and dried to form a film with a thickness of 7 microns. This film had good electrical conductivity, with ρ=0.5Ω/hole.

Example 2 Tetrabutoxytitanium (0.03 mol), triethylaluminum (0.15 mol), toluene 200 m II
The mixed solution was sprinkled on 200 g of carbon fiber powder, thoroughly mixed, and then dried under reduced pressure. This catalyst-adhered powder was suspended in 5000 ml of petroleum ether and cooled to -78°C.
At this temperature, an equal volume mixed gas of acetylene and nitrogen is blown in at a rate of 2700 ml per hour. The reaction is stopped after 3 hours, and the precipitate is collected and thoroughly washed with toluene to remove the catalyst. Then, the obtained black powder was mixed with 40% HB.
When the carbon fibers are placed in an acetic acid solution and immersed for 1 hour, the remaining catalyst fragments are eluted into the acid solution, and the polyacetylene grown on the surface of the carbon fibers is doped with 1lBF4, so this is washed repeatedly with methanol and thoroughly washed. After deoxidizing, vacuum dry. The obtained powder was made into an ink in the same manner as in Example 1, and the conductivity of the coating film was examined and found to be ρ=600Ω/mouth. This ink is suitable for printing on insulating paper to form circuit patterns.

Example 3 Dibutoxyvanadyl chloride (0,002 mol), tributyl aluminum (0,02 mol), butane 2000
ml of the mixture was cooled to -78°C, and 1 ml of acetylene was added to it.
57! It takes one hour to infuse. After the reaction is completed, methanol Room 1 containing 1% hydrogen chloride is added, and then the butane is distilled off under reduced pressure. Residue 10% methanol 9
Wash repeatedly with 0% toluene solution to remove 90% of the catalyst components.
After removing the above, 200ml of 3% iodine/toluene solution
jl! Add and leave at room temperature for 5 hours. The mixture is filtered to collect the solids and washed thoroughly with toluene. 10 g of paste containing 5 g of acicular polyacetylene powder doped with iodine and a small amount of hydrogen chloride thus obtained, 3 g of deashed high-purity graphite powder, and 20 g of epoxy resin base paint (3 g of thermosetting epoxy resin)
, a mixture of 17 g of thinner containing 1 part of butylcarpito)
The mixture was kneaded to make a conductive ink. This molded epoxy resin ink has good adhesion to glass, ceramic, and metal, and after drawing the desired pattern on these surfaces, it is heated at 150°C for 30 minutes.
When cured by heating at 160°C for 1 hour, a beautiful coating film was formed. This coating had a resistance of ρ-270Ω/mouth.

This ink can also be conveniently used as a bonding agent for electrical contacts.

Example 4 Tetrabutoxytitanium (0.02 mol), triethylaluminum (0.08 mol) and methylene chloride 1
Cool 500 ml of the mixture to -78°C and add a gas mixture of 90% acetylene and 10% methylacetylene (1
01) for 1 hour, 60% HBF.

Add 50 ml of acetic acid solution and mix for 1 hour. Then, the reaction mixture was poured into toluene containing a small amount of acetylacetone, and the resulting precipitate was collected, thoroughly washed with methanol, and dried. In this operation, most of the catalyst components are removed and the acetylene polymer is doped and stabilized with HBF4. Powder Log obtained here, polystyrene I
g, polybutadiene O, 2g thinner (xylene 75
%, toluene 13%, isobutanol 10% and ethyl acetate 2%) and kneaded in 100 g can be stored in a bottle as a conductive marking ink, and it can be used to draw figures and letters with a brush, brush, felt-tip pen, etc. It is something that can be drawn. The conductivity of the thin film obtained by this method is .rho.-1000 .OMEGA./hole. If a conductive binder made by copolymerizing polybutadiene with acetylene is used as the binder for this ink, the conductivity of the film will be ρ
=430Ω/mouth.

This ink is useful as a protective ink for printed circuits.

Example 5 Tantalum pentachloride (0.1 mol) in toluene 1000++
+β.

Dispersed in 1000ml of cyclohexane II, added phenylacetylene (1 mol) and continued reaction at 80°C for 5 hours, cooled to -45°C and added triethylaluminum (0.3 mol), followed by acetylene (3
0β) was injected over a period of 3 hours. Powder of acetylene copolymerized with polyphenylacetylene is suspended in the black reaction solution, so this is collected by centrifugation, and immediately
Wash with 0% methanol/toluene mixture, and then thoroughly wash with toluene repeatedly. After adding and mixing 0.5 g of iodine monochloride as a dopant to 30 g of the black paste obtained in this way (mixed with about 60% toluene), acrylate copolymer (30% methyl acrylate, 15% butyl acrylate) was added. %, 2-ethylhexyl acrylate 35%, hydroxyethyl acrylate 20% copolymer) 5g and thinner (toluene 20%, ethyl acetate 50%, 5ec-butanol 20%)
%, Cellosolve acetate 10% mixture) was added to form an ink in a vibrating mixing container.

This ink was applied onto a polyester film and the conductivity was measured after drying: = 2.5 x 10-' S/am
Became. In nature, the σ value can be changed by changing the type and amount of the dopant. The conductive ink obtained here can be used for printed circuits and film connectors.

〔Effect of the invention〕

The present invention relates to a new conductive ink containing a polymer of an acetylene compound, and the ink can be applied to a glass substrate, a ceramic substrate, or a plastic substrate to form a coating film and a contact pattern by printing.

Inorganic board base, textile base 5 paper base, rubber base.

It can be easily applied to wood substrates and other composite substrates.

By using the conductive ink of the present invention, conductivity can be imparted according to the purpose of use, the quality is stable, and there are great economic advantages.

Therefore, the present invention is of great industrial value, and can be used in electrical appliances, electronic products, antistatic materials, etc.
It is widely used in communications equipment parts, display parts, office equipment parts, battery materials, toy parts, sensor parts, and other applications, and is expected to be in high demand for industrial and daily necessities.

Claims (2)

[Claims] (1) An oxidizing agent, a reducing agent, an acidic substance, a basic substance or A conductive ink comprising at least one substance selected from the group consisting of these compounds and conductive powder, and a resin in an amount corresponding to 5 to 50% by weight of the polymer. (2) Oxidizing agents, reducing agents, acidic substances, basic substances or At least one substance selected from the group consisting of these compounds and conductive powder and a resin in an amount equivalent to 5 to 50% by weight of the polymer are blended, and the solid concentration is adjusted using an organic solvent. A method for producing conductive ink characterized by: