JP2019192475A - Active energy ray-curable conductive paste and wiring board - Google Patents

Abstract

To provide an active energy ray-curable conductive paste that has excellent adhesion to a base material and achieves both of conductivity and curability, and a wiring board.SOLUTION: An active energy ray-curable conductive paste contains flaky conductive fine particles with a thickness of 0.5-5 μm and an aspect ratio of 1-20, an amine modified polyfunctional oligomer (A) and a nitrogen-containing monofunctional monomer (B), and a polymerization initiator. In the total mass of the paste, the content of the flaky conductive fine particles is 50-95 mass%.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an active energy ray-curable conductive paste and a wiring board using the same.

  A conductive paste is known as a material used for forming a signal wiring of a printed wiring board. Among conductive pastes, active energy ray curable conductive pastes do not require a curing process at high temperatures unlike thermosetting conductive pastes, and are therefore based on plastic films such as polyethylene terephthalate films that are susceptible to damage at high temperatures. Used for wiring board applications. An active energy ray-curable conductive paste that can be cured / dried by an active energy ray such as an ultraviolet ray or an electron beam is industrially useful with little need for heating.

As the conductive powder used for the conductive paste, metals such as gold, platinum, silver, and palladium that are not oxidized in the air can be used, but generally silver or silver compounds are often used. In some cases, flaky conductive particles may be used in order to make it easier to obtain electrical conduction through contact between the conductive powder particles. For example, Patent Document 1 discloses an active energy ray-curable conductive paste containing silver fine particles, urethane acrylate, a nitrogen-containing monofunctional monomer, and a polymerization initiator.

  However, when flaky conductive fine particles are used in order to improve conductivity, there is a problem in that the transmittance of ultraviolet rays, which are active energy rays, decreases, and the curability of signal wiring made of conductive paste decreases. . Further, the conventional active energy ray-curable conductive paste has a problem that volumetric shrinkage due to curing is large and adhesion to a substrate is low.

JP 2007-119682 A

  An object of this invention is to provide the active energy ray hardening-type electrically conductive paste and wiring board which have favorable adhesiveness with respect to a base material and are compatible with electroconductivity and sclerosis | hardenability.

The present invention
Active energy rays including flaky conductive fine particles having a thickness of 0.5 to 5 μm and an aspect ratio of 1 to 20, an amine-modified polyfunctional oligomer (A) and a nitrogen-containing monofunctional monomer (B), and a polymerization initiator It is a curable conductive paste, and relates to an active energy ray-curable conductive paste containing 50 to 95% by mass of flaky conductive fine particles in the total mass of the paste.

The present invention also relates to the active energy ray-curable conductive paste, wherein the amine-modified polyfunctional oligomer (A) has a hydroxyl group and has a weight average molecular weight of 500 to 2,000.

The present invention further includes a monomer (C) having at least one structure selected from a cycloolefin structure, a trimethylolpropane-derived structure, a pentaerythritol-derived structure, and a glycerin-derived structure (however, the oligomer (A) and the monomer (B) are included) The active energy ray-curable conductive paste.

  Moreover, this invention relates to the said active energy ray hardening-type electrically conductive paste which contains an aluminum chelate compound further.

  The present invention also relates to the active energy ray-curable conductive paste for screen printing.

  Moreover, this invention relates to the wiring board which has a conductive layer formed from the said active energy ray hardening-type conductive paste on a base material.

  The present invention also relates to an electronic device comprising the wiring board.

  According to the present invention, it is possible to provide an active energy ray-curable conductive paste and a wiring board that have good adhesion to a substrate and have both conductivity and curability.

In particular, an active energy ray-curable conductive paste capable of imparting good adhesion to an ITO (indium-tin-oxide) vapor deposition substrate could be provided.

It is a schematic sectional block diagram of the structure of the wiring board to which the active energy ray hardening-type conductive paste of this invention is applied. It is a general | schematic cross-section block diagram of the structure of the touchscreen to which the active energy ray hardening-type conductive paste of this invention is applied. It is a general | schematic cross-section block diagram of the structure of the organic thin-film solar cell to which the active energy ray hardening-type conductive paste of this invention is applied. It is a schematic sectional block diagram of a structure of the photosensitized solar cell to which the active energy ray hardening-type conductive paste of this invention is applied. It is a general | schematic cross-section block diagram of the structure of non-contact ID to which the active energy ray hardening-type conductive paste of this invention is applied.

DESCRIPTION OF EMBODIMENTS Embodiments of the present invention will be described in detail below, but descriptions of requirements and the like described below are representative examples of embodiments of the present invention, and are not limited to these contents unless they exceed the gist. .

The active energy ray-curable conductive paste of the present invention comprises flaky conductive fine particles having a thickness of 0.5 to 5 μm and an aspect ratio of 1 to 20, an amine-modified polyfunctional oligomer (A), a nitrogen-containing monofunctional monomer ( B) and a polymerization initiator.
The active energy ray-curable conductive paste is cured by irradiating active energy rays on a coating layer formed on a substrate by printing (including coating or coating) to form a conductive layer. When the conductive layer is a signal wiring, the signal wiring is preferably used for a wiring board.

In addition, as an active energy ray, an ultraviolet ray, an electron beam, visible light, etc. are mentioned, However, From a sclerosing | hardenable viewpoint, an ultraviolet ray is preferable.

  The active energy ray-curable conductive paste contains an amine-modified polyfunctional oligomer (A) and a nitrogen-containing monofunctional monomer (B), thereby suppressing curing shrinkage of the coating layer during active energy ray curing and electronegative. Adhesion to the substrate is improved by the presence of a high degree of nitrogen atoms. In addition, by using flaky conductive fine particles having a thickness of 0.5 to 5 μm and an aspect ratio of 1 to 20, the flaky conductive fine particles overlapped in the coating layer during active energy ray irradiation. Curing and conductivity can be achieved by entering the lower layer from the upper layer while ultraviolet rays are reflected through the gap.

<Flake conductive fine particles>
The flaky conductive fine particles in the present invention have a thickness of 0.5 to 5 μm and an aspect ratio of 1 to 20.
When the thickness is 0.5 to 5 μm and the aspect ratio is 1 to 20, the flaky conductive fine particles in the coating layer suppress the reflection of active energy rays such as ultraviolet rays, and the flaky conductive fine particles The active energy ray can be easily taken into the gap. Thereby, sclerosis | hardenability improves more. The aspect ratio can be calculated by [average major axis (μm)] / [average thickness (μm)]. The average major axis (μm) at this time is an average value obtained by directly observing the major axis and thickness of about 30 particles in an image with a magnification (around 2000 times) with a scanning electron microscope. The aspect ratio is preferably 2 to 17, and more preferably 3 to 15.

The thickness of the flaky conductive fine particles is determined by preparing an active energy ray-curable conductive paste, and using a conductive layer formed by printing, the cross section of the conductive layer is measured with a scanning electron microscope (around 2000 times magnification). The thickness of about 30 particles can be averaged from the enlarged image. In another method, a sample obtained by curing a mixture of flaky conductive fine particles and a commercially available epoxy resin is prepared, and the cross section of the sample can be obtained in the same manner as described above using a scanning electron microscope. .

The material of the flaky conductive fine particles is, for example, gold, silver, copper, amorphous copper, nickel, chromium, palladium, rhodium, ruthenium, indium, silicon, aluminum, tungsten, molybdenum, platinum and other metals, and alloys thereof. Silver oxide, and metal oxides such as indium oxide, antimony oxide, zinc oxide, tin oxide, antimony-doped tin oxide, ruthenium oxide and indium-tin composite oxide (ITO), carbon black, and graphite. . The material may be a composite metal such as silver-plated copper powder. Moreover, the covering particle | grains which coat | covered the electroconductive particle | grains with the said metal, a metal oxide, etc. may be sufficient. Among these, metal fine particles or metal oxide fine particles are preferable from the viewpoint of conductivity, and silver fine particles are more preferable.

One or more kinds of flaky conductive fine particles can be used, and the shape of the flaky conductive fine particles is flaky, but non-flaked conductive fine particles can be used in combination. Non-flakes are, for example, spherical, dendritic, acicular and the like. The average particle size of the flaky conductive fine particles is preferably 3 to 15 μm, and more preferably 5 to 10 μm.
The active energy ray-curable conductive paste contains 50 to 95% by mass of flaky conductive fine particles in the total mass, and more preferably 65 to 95% by mass.

  The blending amount of the flaky conductive fine particles is preferably X: Y = 50: 50 to 95: 5, where X is the flaky conductive fine particles and Y is the active energy ray curing component, and 70:30 to 90:10 is more preferable. When an appropriate amount of flaky conductive fine particles is blended, it is possible to achieve both conductivity and printability. The active energy ray curing component is a compound having an ethylenically unsaturated double bond typified by an amine-modified polyfunctional oligomer (A) and a nitrogen-containing monofunctional monomer (B). If it has a compound having a bond, compounds other than the amine-modified polyfunctional oligomer (A) and the nitrogen-containing monofunctional monomer (B) are also included.

In this specification, polyfunctional means having a plurality of ethylenically unsaturated double bonds in one molecule, and monofunctional means having one ethylenically unsaturated double bond in one molecule. . The number of functional groups means the number of ethylenically unsaturated double bonds in one molecule.

The ethylenically unsaturated double bond refers to a group that undergoes a polymerization reaction with active energy rays, and examples thereof include an acryl group and a methacryl group. In the present specification, “(meth) acrylate” means both acrylate and methacrylate, and “(meth) acryl” means both acryl and methacryl.

<Amine-modified polyfunctional oligomer (A)>
Amine modification means containing a substituted amino group, and the amine-modified polyfunctional oligomer (A) is an oligomer having a secondary or tertiary amine structure and a plurality of ethylenically unsaturated double bonds in the same molecule. . The number of ethylenically unsaturated double bonds is preferably 2 to 4, and the weight average molecular weight is preferably 500 to 2000. The oligomer (A) preferably has at least one structure selected from a polyester acrylate structure, a urethane acrylate structure, and an epoxy acrylate structure. More preferably, it contains a polyester acrylate structure. The amine-modified polyfunctional oligomer (A) preferably has a tertiary amino group.
By including the amine-modified polyfunctional oligomer (A), the active energy ray-curable conductive paste further improves the adhesion and curability to the substrate. In particular, adhesion to a substrate having a transparent electrode made of a metal oxide such as ITO is improved.

The amine-modified polyfunctional oligomer (A) can be obtained by an addition reaction of a polyfunctional acrylate such as polyester acrylate, urethane acrylate, or epoxy acrylate and an amine compound. For example, the following manufacturing methods are mentioned.
A tetrafunctional (meth) acrylate oligomer having a tertiary amino can be synthesized by addition-reacting an alkanolamine (1 mol) as an amine compound to a trifunctional (meth) acrylate (2 mol) as a polyfunctional acrylate.
Specifically, the addition reaction results in a polyfunctional oligomer having a secondary amino group by adding one acrylate group of the trifunctional (meth) acrylate to the primary amino group of the alkanolamine. Furthermore, if the acrylate group of the trifunctional (meth) acrylate and the secondary amino group form an addition reaction, a polyfunctional oligomer having a tertiary amino group is obtained. The number of functional groups and the molecular weight of the amine-modified polyfunctional oligomer (A) can be adjusted by controlling the polyfunctional acrylate species and the reaction ratio thereof.

<Polyester acrylate>
Examples of the trifunctional (meth) acrylate as the polyester acrylate include trimethylolpropane tri (meth) acrylate, ethylene oxide-added trimethylolpropane tri (meth) acrylate, propylene oxide-added trimethylolpropane tri (meth) acrylate, and glycerin tri ( (Meth) acrylate, ethylene oxide-added glycerin tri (meth) acrylate, propylene oxide-added glycerin tri (meth) acrylate, pentaerythritol tri (meth) acrylate, ethylene oxide modified pentaerythritol tri (meth) acrylate, propylene oxide modified pentaerythritol tri (meth) ) Acrylate,
Etc. are suitable. A trifunctional (meth) acrylate monomer having a structure in which ethylene oxide, propylene oxide or other alkylene oxide is added is preferable.

The polyfunctional acrylate as the polyester acrylate may be a 4-6 functional acrylate. The hexafunctional acrylate is dipentaerythritol hexa (meth) acrylate or an ethylene oxide / propylene oxide adduct thereof, and the 5-functional acrylate is a difunctional acrylate. Examples of tetrafunctional acrylates such as pentaerythritol penta (meth) acrylate and dipentaerythritol hexa (meth) acrylate include diglycerin EO-modified (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, and pentaerythritol tetra (meth) acrylate. It is done.

The polyfunctional acrylate as the polyester acrylate may be a bifunctional acrylate,
Bifunctional acrylates include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, dipropylene glycol di ( (Meth) acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, pentyl glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, hydroxypivalylhydroxy Pivalate di (meth) acrylate (commonly called manda), hydroxypivalyl hydroxypivalate dicaprolactonate di (meth) a Relate, 1,6-hexanediol di (meth) acrylate, 1,2-hexanediol di (meth) acrylate, 1,5-hexanediol di (meth) acrylate, tricyclodecane dimethylol dicaprolactonate di (meth) Preferred examples include acrylate, tricyclodecane methanol di (meth) acrylate, bisphenol A tetraethylene oxide adduct di (meth) acrylate, bisphenol F tetraethylene oxide addition di (meth) acrylate, and the like.

<Urethane acrylate>
Examples of the hexafunctional urethane acrylate include pentaerythritol tri (meth) acrylate hexamethylene diisocyanate adduct, pentaerythritol tri (meth) acrylate toluene diisocyanate adduct, pentaerythritol tri (meth) acrylate isophorone diisocyanate adduct, and the like.
Examples of the tetrafunctional urethane acrylate include glycerin di (meth) acrylate hexamethylene diisocyanate adduct, trimethylolpropane di (meth) acrylate isophorone diisocyanate adduct, and the like.
Examples of the trifunctional urethane acrylate include ethoxylated isocyanuric acid tri (meth) acrylate, ε-caprolactone-modified tris- (2- (meth) acryloxyethyl) isocyanurate, and the like.
Examples of the bifunctional urethane acrylate include hydroxyethyl (meth) acrylate hexamethylene diisocyanate adduct, hydroxybutyl (meth) acrylate isophorone diisocyanate adduct, and the like.

<Epoxy acrylate>
Examples of the epoxy acrylate include EBECRYL series manufactured by Daicel Ornex. As the tetrafunctional epoxy acrylate, EBECRYL860 (epoxidized soybean oil acrylate), as the trifunctional epoxy acrylate, EBECRYL3603 (novolak epoxy acrylate), as the bifunctional epoxy acrylate, EBECRYL600 bisphenol A type epoxy acrylate, etc. Is mentioned.

  The amine compound is preferably an alkanolamine, and for example, methanolamine, ethanolamine, propanolamine, butanolamine, diethanolamine and the like are suitable. By using alkanolamine, a hydroxyl group can be imparted to the amine-modified polyfunctional oligomer (A).

As amine compounds other than alkanolamine, alkylamine, aniline and other amine compounds having a primary or secondary amino group are suitable.

  One type or two or more types of amine-modified polyfunctional oligomer (A) can be used, preferably 1 to 20% by mass in the total mass of the active energy ray-curable conductive paste, and 5 to 10% by mass More preferably.

<Nitrogen-containing monofunctional monomer (B)>
The nitrogen-containing monofunctional monomer (B) is a monomer having a molecular weight of 300 or less having a nitrogen atom and one ethylenically unsaturated double bond. The nitrogen atom is preferably a nitrogen atom derived from at least one selected from an amide group, a lactam group, a morpholino group, and an imide group, and more preferably an amide group or an imide group.

Examples of the nitrogen-containing monofunctional monomer (B) include 4-acryloylmorpholine, N-vinyl-ε-caprolactam, dimethylacrylamide, diethylacrylamide, isopropylacrylamide, dimethylaminopropylacrylamide, hydroxyethylacrylamide, and N-acryloyloxyethylhexahydro. Preferred examples include phthalimide. Among these, 4-acryloylmorpholine, N-acryloyloxyethylhexahydrophthalimide and the like are preferable in terms of improving the adhesion. One type or two or more types of nitrogen-containing monofunctional monomers (B) can be used, and the nitrogen-containing monofunctional monomer (B) is 1 to 20% by mass in the total mass of the active energy ray-curable conductive paste. It is preferable to contain, and it is more preferable to contain 3-8 mass%.

By including both the amine-modified polyfunctional oligomer (A) and the nitrogen-containing monofunctional monomer (B), the substrate adhesion of the cured film of the active energy ray-curable conductive paste becomes good. This is because the amino group of the amine-modified polyfunctional oligomer (A) and the nitrogen-containing group of the nitrogen-containing monofunctional monomer (B) have the effect of being thrown into (entering fine irregularities of the base material to improve the adhesion). (A) and (B) preferably have a mass ratio ((A) / (B)) of 80/20 to 20/80, more preferably 70/30 to 30/70.
The total amount of the amine-modified polyfunctional oligomer (A) and the nitrogen-containing monofunctional monomer (B) in the active energy ray-curable conductive paste is preferably 5 to 30% by mass, more preferably 7 to 20% by mass. 10 to 18% by mass is more preferable. When both monomers are contained in appropriate amounts, both adhesion and curability can be achieved at a higher level.

<Polymerization initiator>
Examples of the polymerizable initiator include benzoin, such as benzoin, benzoin methyl ether, benzoin isopropyl ether, and α-acryl benzoin, 2,2-dimethoxy-1,2-diphenylethane-1-one (Irgacure 651: manufactured by BASF Corporation). ), 1-hydroxy-cyclohexyl-phenyl-ketone (Irgacure 184, manufactured by BASF), 2-hydroxy-2-methyl-1-phenyl-propan-1-one (Darocur 1173: manufactured by BASF), 1- [ 4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one (Irgacure 2959: manufactured by BASF), 2-methyl-1 [4- (methylthio) phenyl]- 2-morpholinopropan-1-one (Irgacure 907: manufactured by BASF Corporation) 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1 (Irgacure 369: manufactured by BASF), bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide (Irgacure) 819: manufactured by BASF), 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (Darocur TPO: manufactured by BASF), 2-hydroxy-1- {4- [4- (2-hydroxy-2-methyl) -Propyl) -benzyl] -phenyl} -2-methyl-propan-1-one (Irgacure 127: manufactured by BASF), 2-dimethylamino-2- (4-methyl-benzyl) -1- (4-morpholine) -4-yl-phenyl) -butan-1-one (Irgacure 379: manufactured by BASF), 2,4-diethyl Thioxanthone (Kayacure DETX-S: manufactured by Nippon Kayaku Co., Ltd.), 2-chlorothioxanthone (Kayacure CTX: manufactured by Nippon Kayaku Co., Ltd.), benzophenone (Kayacure BP-100: manufactured by Nippon Kayaku Co., Ltd.), [4- (Methylphenylthio ) Phenyl] phenylmethane (Kayacure BMS: manufactured by Nippon Kayaku Co., Ltd.), ethyl anthraquinone (Kayacure 2-EAQ: manufactured by Nippon Kayaku Co., Ltd.), Esacure KIP100 (produced by Siebel Hegner), diethoxyacetophenone, bis (2,6-dimethoxy) Benzoyl) -2,4,4-trimethyl-pentylphosphine oxide (BAPO1: manufactured by BASF), BTTB (manufactured by NOF Corporation), and the like.

Among them, 2-methyl-1 [4- (methylthio) phenyl] -2-morpholinopropan-1-one (Irgacure 907: manufactured by BASF), 2-benzyl-, in terms of improving curability and adhesion. 2-dimethylamino-1- (4-morpholinophenyl) -butanone-1 (Irgacure 369: manufactured by BASF), bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide (Irgacure 819: manufactured by BASF) ) 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (Darocur TPO: manufactured by BASF) is more preferable.

One type or two or more types of polymerization initiators can be used.

It is preferable that a polymerization initiator contains 0.1-10 mass% in an active energy ray hardening-type electrically conductive paste, and 0.3-3 mass% is more preferable. When an appropriate amount of a polymerization initiator is included, it is easy to achieve both curability and adhesion.

<Monomer (C)>
The active energy ray-curable conductive paste preferably further contains a monomer (C). The monomer (C) is a compound having an ethylenically unsaturated double bond other than the amine-modified polyfunctional oligomer (A) and the nitrogen-containing monofunctional monomer (B), and has a cycloolefin structure, a trimethylolpropane-derived structure, pentaerythritol A monomer having at least one structure selected from a derived structure and a glycerin derived structure. By having the said structure, there exists an effect which suppresses shrinkage | contraction of the cured film after active energy ray hardening, and it is excellent in sclerosis | hardenability, printing viscosity, adhesiveness, etc. The monomer (C) preferably has a molecular weight of 100 to 500. The monomer (C) preferably has 1 to 4 functional groups, more preferably 1 to 2.

The ratio of the total mass of the monomer (C) to the total mass ((A) + (B)) of the amine-modified polyfunctional oligomer (A) and the nitrogen-containing monofunctional monomer (B) is ((A) + (B)) : (C) = 50: 50 to 100: 0 is preferable, and 50:50 to 95: 5 is more preferable.

Monomer (C) can use 1 type, or 2 or more types, It is preferable that 1-10 mass% is included in active energy ray hardening-type conductive paste gross mass, and 2-5 mass% is more preferable. .

The monomer (C) having a cycloolefin-derived structure is preferably 1,4-cyclohexanedimethanol mono (meth) acrylate, 1,4-cyclohexanedimethanol di (meth) acrylate, tricyclodecane dimethylol dicaprolactonate di (Meth) acrylate, tricyclodecane methanol di (meth) acrylate, etc. are mentioned.

The monomer (C) having a structure derived from trimethylolpropane is preferably trimethylolpropane tri (meth) acrylate, trimethylolpropane tricaprolactonate tri (meth) acrylate, trimethylolethane tri (meth) acrylate, trimethylolhexanetri (Meth) acrylate, trimethylol octane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, ditrimethylolpropane tetracaprolactonate tetra (meth) acrylate, ditrimethylolethane tetra (meth) acrylate, ditrimethylolbutanetetra (Meth) acrylate, ditrimethylolhexanetetra (meth) acrylate, ditrimethyloloctanetetra (meth) acrylate, etc. It is.

  The monomer (C) having a pentaerythritol-derived structure is preferably pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tetracaprolactonate tetra (meth) acrylate, dipentaerythritol penta (meth) Acrylate, dipentaerythritol hexa (meth) acrylate, tripentaerythritol hexa (meth) acrylate, tripentaerythritol hepta (meth) acrylate, tripentaerythritol octa (meth) acrylate, pentaerythritol polyalkylene oxide hepta (meth) acrylate, etc. Can be mentioned.

  As for the monomer (C) which has a structure derived from glycerol, Preferably glycerol tri (meth) acrylate diglycerol tetra (meth) acrylate etc. are mentioned.

<Other monomers>
The active energy ray-curable conductive paste can use other monomers than the above as long as the effects thereof are not impaired. An example is shown below.

The monofunctional monomer is preferably a (meth) acrylate having 1 to 18 carbon atoms in the alkyl chain. For example, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) ) Acrylate, dodecyl (meth) acrylate, stearyl (meth) acrylate. Other monofunctional monomers include, for example, benzyl (meth) acrylate, butylphenol (meth) acrylate, octylphenol (meth) acrylate, nonylphenol (meth) acrylate, dodecylphenol (meth) acrylate, isobornyl (meth) acrylate, cyclohexyl ( And alicyclic (meth) acrylates such as (meth) acrylate and tricyclodecane monomethylol (meth) acrylate.

Examples of the bifunctional monomer include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, and dipropylene glycol. Di (meth) acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, pentyl glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, hydroxy Baryl hydroxypivalate di (meth) acrylate (commonly called Manda), hydroxypivalyl hydroxypivalate dicaprolactonate di (meth) a Relate, 1,6-hexanediol di (meth) acrylate, 1,2-hexanediol di (meth) acrylate, 1,5-hexanediol di (meth) acrylate, bisphenol A tetraethylene oxide adduct di (meth) acrylate, Bisphenol F tetraethylene oxide adduct di (meth) acrylate and the like.

<Aluminum chelate compound>
The active energy ray-curable conductive paste preferably further contains an aluminum chelate compound. Since the aluminum chelate compound can improve the dispersibility of the flaky conductive fine particles, the fluidity of the active energy ray-curable conductive paste is improved, and a smoother conductive layer can be formed.

An aluminum chelate compound refers to a compound comprising aluminum and a ligand. Among these, it is preferable to have a chelate and further have an alkoxide ligand. As such a ligand, for example, acetonate is preferable as a chelate, acetylacetonate group, methyl acetoacetonate group and ethyl acetoacetate group are preferable, and propionate group, isopropionate group and the like are preferable as alkoxide. . When these ligands are used, the conductivity of the conductive layer is further improved.

Aluminum chelate compounds include, for example, ethyl acetoacetate aluminum diisopropionate, aluminum tris (ethyl acetoacetate), alkyl acetoacetate aluminum diisopropylate, aluminum tris (acetyl acetate), aluminum monoacetyl acetate bis (ethyl acetoacetate) Aluminum-di-n-butoxide monomethyl acetoacetate, aluminum diisobutoxide monomethyl acetoacetate, aluminum di-sec-butoxide monomethyl acetoacetate, and the like.

One kind or two or more kinds of aluminum chelate compounds can be used, and the molecular weight of the aluminum chelate compound is preferably 200 to 420. The aluminum chelate compound is preferably blended in an amount of 0.1 to 5 parts by mass, more preferably 0.5 to 2% by mass, based on the total mass of the active energy ray-curable conductive paste. When the blending amount is 0.5 parts by mass or more, the dispersibility of the flaky conductive fine particles is further improved. Further, when the blending amount is 5% by mass or less, the adhesion is further improved.

The active energy ray-curable conductive paste can contain the following components as long as the problem can be solved. Examples include binder resins, polymerization inhibitors, plasticizers, lubricants, organic solvents, dispersants, leveling agents, antifoaming agents, antioxidants, and antisulfurizing agents.

In addition, it is preferable to contain a polymerization inhibitor from a viewpoint of gelation prevention (prevention of excessive reaction) and uniform curability. Applicable compounds include 4-teat-butylcatechol, hydroquinone, teat-butylhydroquinone, dibutylhydroxytoluene, 2,2-diphenyl-1-picrylhydrazyl, 4-methoxyphonol, phenothiazine, N-nitroso-N- Examples thereof include phenylhydroxylamine ammonium salt and N-nitrosophenylhydroxyamine aluminum salt. Among them, use of N-nitrosophenylhydroxyamine aluminum salt is preferable. The content is preferably 0.01 to 0.1% by mass in the total mass of the active energy ray-curable conductive paste.

<Organic solvent>
The organic solvent is preferably used in an amount of 0 to 10% by mass in the total mass of the active energy ray-curable conductive paste, for example, ketone, aromatic solvent, alcohol, cellosolve, glycol ether, ester, aliphatic Solvents, petroleum solvents and the like are preferable.
Examples of the ketone include acetone, methyl ethyl ketone, methyl isobutyl ketone, 3-pentanone, 2-heptanone, diisobutyl ketone, isophorone, cyclohexanone, and gamma-butyl lactone. Examples of the aromatic solvent include benzene, toluene, xylene, ethylbenzene, diethylbenzene, alkylbenzene having an alkyl chain having 5 to 20 carbon atoms, chlorobenzene, and the like.
Examples of the alcohol include methanol, ethanol, normal propanol, isopropanol, normal butanol, isobutanol, neopentylbutanol, hexanol, octanol, ethylene glycol, propylene glycol, and benzyl alcohol.
Examples of cellosolve include methyl cellosolve, ethyl cellosolve, butyl cellosolve, and hexyl cellosolve.
Examples of the glycol ether include ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol mono n-butyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono n- Examples include propyl ether, propylene glycol mono n-butyl ether, dipropylene glycol monomethyl ether, dipropylene glycol mono n-propyl ether and the like.
Examples of the ester include ethyl acetate, butyl acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, and propylene glycol monomethyl ether acetate.
Examples of the aliphatic solvent include n-heptane, n-hexane, cyclohexane, methylcyclohexane, and ethylcyclohexane.
Examples of the petroleum solvent include an aroma free solvent and a heavy aroma solvent.

<Other resins>
The active energy ray-curable conductive paste of the present invention may contain a resin other than the above (A), (B), or (C) as long as the effects thereof are not impaired. The resin is preferably a resin having a number average molecular weight of 1,000 to 100,000 and containing no ethylenically unsaturated double bond. Examples of the resin include polyurethane resin, polyester resin, alkyd resin, butyral resin, acetal resin, polyamide resin, acrylic resin, styrene-acrylic resin, styrene resin, nitrocellulose resin, benzylcellulose resin, styrene-maleic anhydride resin, polybutadiene. Resin, polyvinyl chloride resin, polyvinyl acetate resin, fluorine resin, silicone resin, epoxy resin, phenol resin, maleic acid resin, urea resin, melamine resin, benzoguanamine resin, ketone resin, rosin, rosin ester, chlorinated polyolefin, modified A chlorinated polyolefin, a chlorinated polyurethane, etc. are mentioned, It is preferable to contain in less than 40 mass% in active energy ray hardening-type conductive paste gross mass, and it is more preferable to contain in 2-10 mass%.

<Method for producing active energy ray-curable conductive paste>
An example of a method for producing an active energy ray-curable conductive paste will be described. The amine-modified polyfunctional oligomer (A), the nitrogen-containing monofunctional monomer (B), and the polymerization initiator are put into a kneader, and stirred and kneaded. Next, it is preferable to prepare by adding flaky conductive fine particles and further stirring or kneading. When adjusting the viscosity of the active energy ray-curable conductive paste, it is preferable to add a low-viscosity monomer, an organic solvent, or the like as appropriate. Moreover, it is also preferable that the flaky conductive fine particles are added after being dispersed in advance with other compounding components.

  Examples of the kneader include a disper, a ball mill, a sand mill, a gamma mill, and a three roll. Among them, the use of a three roll mill is preferable.

  The obtained active energy ray-curable conductive paste forms a coating layer by printing on a substrate, and further forms a conductive layer by irradiating with active energy rays. Examples of the printing method include screen printing, inkjet printing, gravure offset printing, and the like, and screen printing is preferable.

<Conductive layer made of active energy ray-curable conductive paste>
For example, the conductive layer can be formed by, for example, a method of producing a desired pattern by performing rotary screen printing using a cylindrical screen plate, and then irradiating with an active energy ray and curing, or a coating layer by flat screen printing. And a desired pattern is formed by laser irradiation. In the latter case, the active energy ray irradiation can be performed at an arbitrary timing after the coating layer is formed. 2-20 micrometers is preferable and, as for the thickness of a conductive layer, 5-15 micrometers is more preferable.

The active energy ray-curable conductive paste of the present invention is cured by passing through an ultraviolet irradiation device such as a high-pressure mercury lamp, a metal halide lamp and a conveyor. In order to cure sufficiently, the irradiation speed of the conveyor speed is 3 m / min or less (200 mJ / cm ² or more) under one lamp of 120 W / cm air-cooled metal halide lamp, and a higher output lamp is used. The conveyor speed can be increased by increasing the number.

<Base material>
The base material is preferably a composite base material such as a paper base material or a plastic base material. Moreover, it is preferable that the thickness of a base material is about 50-200 micrometers.
Examples of the paper substrate include high-quality paper, synthetic paper, coated paper, and processed paper. Examples of the processed paper include impregnated paper, water-resistant processed paper, insulating processed paper, and stretch-processed paper. Among these, in order to obtain a stable resistance value, when coated paper or processed paper is used, the conductivity is further improved. Note that the conductivity of the coated paper is improved in proportion to the level of smoothness.

Examples of the plastic substrate include polyethylene terephthalate, polyester, polyethylene, polypropylene, cellophane, vinyl chloride, vinylidene chloride, polystyrene, vinyl alcohol, ethylene-vinyl alcohol, nylon, polyimide, and polycarbonate. The shape of the substrate is preferably a sheet shape or a plate shape. Moreover, it is preferable that surface treatment is performed in order to improve adhesiveness with a conductive layer, and surface treatment includes dry treatment and wet treatment. Examples of the dry processing include corona processing, plasma processing, and flame processing. Examples of the wet treatment include an anchor coat agent.

  It is preferable that a base material is equipped with functional layers, such as a vapor deposition layer and a coating layer, on the surface. Examples of the vapor deposition layer include ITO and silicon oxide. The coating layer is preferably a conductive layer containing a conductive substance such as a composite of silver nanowires, carbon nanotubes, poly (3,4-ethylenedioxythiophene) and polystyrenesulfonic acid (PEDOT-PSS).

<Wiring board having a conductive layer>
The wiring board of the present invention includes a base material and a conductive layer formed from an active energy ray-curable conductive paste. The conductive layer functions as a signal wiring and can be energized as an electrical signal such as a wiring circuit, a ground wiring, and an antenna wiring. The wiring board is preferably used as, for example, a printed board or a flexible printed board.

<Electronic device comprising a wiring board>
The electronic device of the present invention includes a wiring board. Examples of the electronic device include a solar battery, a touch panel, and a non-contact ID.

FIG. 1 shows an example of a basic configuration using a wiring board. For example, the active energy ray-curable conductive paste of the present invention is patterned on two base materials such as a polyester film by patterning the two-signal wiring by screen printing or the like and then irradiating the active energy rays, and then one insulating layer (protective layer) is formed. Print on the necessary part.

FIG. 2 shows an example of the configuration of the touch panel. 8 The active energy ray of the present invention printed on the periphery of the signal obtained from ITO of 7a transparent conductive (ITO) film X and 7b transparent conductive (ITO) film Y that senses X-axis and Y-axis signals on a display Current collection is performed using the curable conductive paste (6a, 6b). In addition, 8 display, 7a transparent conductive (ITO) film X, 7b transparent conductive (ITO) film Y, and 4 cover glass are bonded together by 5OCA which is a transparent adhesive sheet.

FIG. 3 shows an example of the configuration of the organic thin film solar cell. Nine transparent conductive (ITO) films are formed with 10 hole transport layers such as PEDOT: PSS, 11 organic semiconductor active layers, 12 electron transport layers of LiF and n-type semiconductors, and 13 electrodes made of the silver paste of the present invention. .

FIG. 4 shows an example of the configuration of the photosensitized solar cell. Titanium oxide dyed with 19 platinum layers, 18 electrolytes, and 17 dyes is sealed between 16 upper and lower transparent conductive (ITO) films with 16 spacers, and power is obtained using the silver paste of the present invention as 15 current collectors. .

FIG. 5 shows an example of the configuration of the non-contact ID. A 23 IC chip is bonded to a 22 conductive antenna patterned on the 24 base material with the silver paste of the present invention, and 20 protective films are pasted using 21 adhesives.
Here, the IC chip performs storage, accumulation, and calculation of data. The non-contact ID is an RFID (Radio Frequency Identification), a non-contact IC card, a non-contact IC tag, a data carrier (recording medium), a wireless card, a radio wave between a reader or a reader / writer using radio waves. Identification and data transmission / reception are performed. Examples of the usage include ID management and history management of a fee collection system and the like, location management of a road use status management system, cargo, a package tracking / management system, and the like.

EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited by these Examples. In addition, "part" in an Example represents a mass part and% represents the mass%.

<Weight average molecular weight>
The weight average molecular weight was measured using a Shodex GPC-104 / 101 system manufactured by Showa Denko.
Column Shodex KF-805L, KF-803L, KF-802
Detector differential refractometer (RI)
Column temperature 40 ° C
Eluent tetrahydrofuran (THF)
Flow rate: 1.0 mL / min
Sample concentration: 0.2%
Standard sample for calibration curve: TSK standard polystyrene

<Fine particle thickness and aspect ratio>
The average major axis of 30 particles is directly observed with a scanning electron microscope, a sample in which fine particles are solidified with a commercially available epoxy resin is prepared, and the cross section of the sample is directly observed with a scanning electron microscope (magnification 2000 times). The average thickness of 30 fine particles in the field of view was calculated to calculate the average aspect ratio. The scanning electron microscope used was TM-1000 manufactured by Hitachi High-Technologies Corporation.

[Flake-shaped conductive fine particle production example 1]
700 parts of pure water was added to 340 parts of silver nitrate (special grade reagent), and then 700 parts of 25% ammonia water was added to prepare an aqueous silver complex solution. On the other hand, 111 parts of hydroquinone (special reagent grade), anhydrous potassium sulfite (special reagent grade) and 1260 parts of pure water were blended to prepare a reducing aqueous solution. The reducing aqueous solution was put in a beaker, and the aqueous silver complex solution was added with vigorous stirring. At this time, the temperature of the mixed solution was kept constant at 25 ° C. during the reaction. After completion of the addition, the mixture was sufficiently stirred to complete reduction precipitation, and then the precipitated silver powder was filtered and separated, washed with water, and dried to obtain reduced silver powder. 98 parts of reduced silver powder was mixed with 2 parts of oleic acid, rotated with a ball mill for 30 minutes together with a zirconia ball having a diameter of 2 mm, and flattened to obtain silver powder A. Silver powder A had a thickness of 1.2 μm and an aspect ratio of 10.

[Amine-modified polyfunctional oligomer synthesis example 1]
Trimethylolpropane PO (polyolefin) -modified triacrylate (Aronix M321: TMPPOAc, manufactured by Toagosei Co., Ltd.) 893 parts and ethanolamine (monoethanolamine: MEA, manufactured by Nippon Shokubai Co., Ltd.) 61 were added to a 2 liter flask equipped with a reflux condenser. The amine-modified polyfunctional oligomer 1 was obtained by adding a part and making it react at 50 degreeC under normal pressure, and stirring for 3 hours.
The amine-modified polyfunctional oligomer 1 is a polyester acrylate, has a tertiary amino group, has a weight average molecular weight of 1000, and has 4 functional groups.
[Amine-modified polyfunctional oligomer synthesis example 2]
A flask equipped with a reflux condenser was charged with 592 parts of trimethylolpropane triacrylate (Aronix M309: TMPAc manufactured by Toa Gosei Co., Ltd.) and 61 parts of ethanolamine, and the reaction was continued by stirring at 50 ° C. for 3 hours at normal pressure. Modified polyfunctional oligomer 2 was obtained.
The amine-modified polyfunctional oligomer 2 is a polyester acrylate, has a tertiary amino group, has a weight average molecular weight of 700, and a functional group number of 4.

[Example 1]
45 parts of amine-modified polyfunctional oligomer 1, 105 parts of 4-acryloylmorpholine (ACMO, manufactured by JK Chemicals) corresponding to nitrogen-containing monofunctional monomer (B), and Irgacure 907 (manufactured by BASF) 10.5 as a polymerization initiator Part, aluminum chelate compound (aluminum ethyl acetoacetate diisopropylate, product name: ALCH, manufactured by Kawaken Fine Chemical Co., Ltd.), polymerization inhibitor N-nitrosophenylhydroxyamine aluminum salt (Q-1301, Wako Pure Chemical Industries, Ltd.) 0.5 parts) was mixed with a dissolver and stirred until completely dissolved. Thereafter, 834 parts of silver powder A was added, stirred for 15 minutes with a dissolver, and then sufficiently kneaded with a three-roll mill to obtain an active energy ray-curable conductive paste 1.

[Examples 2 to 12]
Active energy ray-curable conductive pastes 2 to 12 were obtained in the same manner as in Example 1 except that the raw materials and compounds listed in Table 1 were used. Abbreviations in the table represent the following.
Aronix M-140: N-acryloyloxyethyl hexahydrophthalimide (manufactured by Toa Gosei Co., Ltd.)
NK ester A-DCP: tricyclodecane dimethylol dicaprolactonate diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd.)
DTMPTAc: ditrimethylolpropane tetraacrylate (manufactured by Toagosei Co., Ltd.)
Aronix M-101: Phenol EO-modified acrylate (manufactured by Toa Gosei Co., Ltd.)
Silver powder B (commercially available flaky silver fine particles, average particle diameter 3 μm, thickness 3 μm, aspect ratio 5)
Silver powder C (Nanomelt AG-XF301S, manufactured by Fukuda Metal Foil Powder Industry Co., Ltd., average particle diameter 6 μm, thickness 0.1 μm, aspect ratio 60)

[Comparative Examples 1-5]
Active energy ray-curable conductive pastes 12 to 16 were obtained in the same manner as in Example 1 except that the raw materials and compounds listed in Table 1 were used. Abbreviations in the table represent the following.

The following properties were measured for the active energy ray-curable conductive pastes obtained in Examples 1 to 12 and Comparative Examples 1 to 5 obtained above, and the physical properties were evaluated.

(1) Evaluation of fluidity The obtained active energy ray-curable conductive paste was used as an E-type viscometer TV250H (manufactured by Toki Sangyo Co., Ltd.), rotor No. 3 was used to measure the viscosities when the rotor rotation speed was 2, 5 and 20 rotations in a 25 ° C. environment. The fluidity was evaluated. The values of viscosity and thixotropy index value (TI value) are defined below. The viscosity was a value 2 minutes after the start of rotation.
Viscosity: Viscosity measured at 5 revolutions TI value = (viscosity at 2 revolutions) / (viscosity at 20 revolutions)

<Evaluation criteria (viscosity)>
A: Viscosity is 3 Pa · s or more and less than 30 Pa · s (good)
B: Viscosity is 30 Pa · s or more and less than 80 Pa · s (can be used)
C: Viscosity is 80 Pa · s or more and less than 150 Pa · s (slightly poor)
D: The viscosity is 150 Pa · s or more and less than 250 Pa · s (defect)
The evaluation at the practical level is A or B.

<Evaluation criteria (TI value)>
A: TI value = 1 or more and less than 2 (good)
B: TI value = 2 or more and less than 3 (usable)
C: TI value = 3 or more and less than 4 (somewhat poor)
D: TI value = 4 or more (defect)
The evaluation at the practical level is A or B.

(2) Measurement of volume resistivity The volume resistivity of the conductive layer was measured to evaluate the conductivity.
A conductive ink is printed on a polyester film (“S10S” manufactured by Toray, 100 μm thick) using a stainless screen plate (screen mesh 400 lines / inch, linear 23 μm) with a pattern of 50 × 100 mm, and 120 W / cm air-cooled metal halide. Measured with a 4-probe resistance measuring instrument (Loresta GP, manufactured by Mitsubishi Chemical Analytech) under UV light with a single lamp (Seritech's UV irradiation device EUV752C), conveyor speed of 3 m / min, and integrated illuminance of 200 mJ / cm ^2. The surface resistivity was determined, and the volume resistivity was calculated by further determining the film thickness with a film thickness meter (Digimicro manufactured by Nikon Corporation).
In the table, “-” indicates that the evaluation is impossible because the material is not cured.
<Evaluation criteria>
A: Volume resistivity is less than 100 μΩcm B: Volume resistivity is 100 μΩcm or more and less than 500 μΩcm C: Volume resistivity is 500 μΩ or more and less than 1000 μΩcm D: Volume resistivity is 1000 μΩ or more.

(3) Evaluation of printability The obtained active energy ray-curable conductive paste was mounted on a semi-automatic screen printer SSA-PC660IP (Ceria Corporation) with a stainless screen plate (400 mesh 400 lines / inch, linear 23 μm) and polyester. A film was printed on a film (Toray PET film “Lumirror T60”, thickness 100 μm) to form a coating layer having a pattern of 50 × 100 mm. A total of 100 sheets were printed, and the printed material on the 100th sheet was irradiated with ultraviolet rays at a conveyor speed of 3 m / min and an integrated illuminance of 200 mJ / cm ² under a 120 w / cm air-cooled metal halide lamp, and the printed state was visually evaluated.
<Evaluation criteria>
A: No blurring and good smoothness B: No blurring and slightly poor smoothness C: Twisted and slightly smoothness D: Lots of blurring and poor smoothness The evaluation at a practical level is A or B .

(4) Curability evaluation The obtained active energy ray-curable conductive paste was placed on a polyester film (“S10S”, thickness 100 μm, manufactured by Toray Industries, Inc.) and a stainless steel screen plate (screen mesh 400 lines / inch, linear 23 μm). Was used to form a coating layer having a pattern of 50 × 100 mm. Next, using a 120w / cm air-cooled metal halide lamp, ultraviolet rays were irradiated with an integrated illuminance of 200 mJ / cm ² under the condition of a conveyor speed of 3 m / min, and the curability of the cured conductive layer was evaluated according to the following criteria.
<Evaluation criteria>
A: Fingerprints are not touched at all (good)
B: Fingerprint is slightly touched (slightly bad)
C: Fingerprint touches (bad)
The practical level evaluation is A.

(5) Adhesive evaluation The adhesiveness with respect to the vapor deposition surface of an ITO vapor deposition film was evaluated.
An active energy ray-curable conductive paste is coated on an ITO vapor-deposited film (Teitoite TCF KH150NM3-50-MR1 / PT125, manufactured by Oike Kogyo Co., Ltd.) for 60 minutes at 140 ° C. with a 50 × 100 mm pattern stainless screen plate ( Screen mesh 400 lines / inch, linear 23 μm), and then using a 120w / cm air-cooled metal halide lamp to irradiate ultraviolet rays with an integrated illuminance of 200 mJ / cm ^{2 at} a conveyor speed of 3 m / min. The conductive layer was cut with a cutter knife to cut the conductive layer so that the substrate was not cut. Formed. Next, a cellophane tape (25 mm width) manufactured by Nichiban Co., Ltd. was applied on the grid from above, and then the cellophane tape was rapidly peeled by hand. The state of the remaining squares was evaluated according to the following criteria.
<Evaluation criteria>
A: Area not peeled is 85% or more (good)
B: Area not peeled off is 70% or more and less than 85% (usable)
C: Area not peeled off is 30% or more and less than 70% (somewhat poor)
D: Unpeeled area is less than 30% (defect)
-: Evaluation is not possible because it is not cured.

As shown in Table 1, with respect to Examples 1 to 12 containing a polyfunctional and monofunctional nitrogen-containing photopolymerizable compound, the TI value was 3.0 or less, excellent fluidity, and printability. The active energy ray curability was good, and the volume resistance value was a low resistance value on the order of 10 μΩcm. Furthermore, in Examples 1-12, the adhesiveness to an ITO vapor deposition film was favorable with all the pastes.

In Comparative Example 1, the curability was good, but the ITO vapor deposition film adhesion was poor. In Comparative Example 2 and Comparative Example 4, in addition to the poor adhesion of the ITO deposited film, the volume resistivity was high, the printed matter was slipped off, and the printability was also poor.

In Comparative Example 3 using silver powder C, it was not cured even when irradiated with ultraviolet rays.

  In Comparative Example 5, the adhesion of the ITO deposited film was good, but the volume resistivity was high and the conduction was poor.

According to the present invention, it is possible to impart excellent adhesion to transparent conductive films including ITO vapor deposition films, which have conventionally been difficult to impart adhesion to active energy ray-curable conductive pastes. Since it has low resistance and good printability, it is possible to form various circuits and to form a circuit even on a substrate having low heat resistance because heating is not required for curing.

1: Insulating layer (protective layer)
2: Signal wiring (silver paste)
3: Base material 4: Cover glass 5: OC
6a: Silver wiring X (silver paste)
6b: Silver wiring Y (silver paste)
7a: Transparent conductive (ITO) film X
7b: Transparent conductive (ITO) film Y
8: Display 9: Transparent conductive (ITO) film 10: Hole transport layer 11: Organic semiconductor active layer 12: Electron transport layer 13: Electrode (silver paste)
14: Transparent conductive (ITO) film 15: Current collector (silver paste)
16: Spacer 17: Titanium oxide + dye 18: Electrolytic solution 19: Platinum layer 20: Protective film 21: Adhesive 22: Conductive antenna (silver paste)
23: IC chip 24: Base material

Claims (7)

Active energy rays including flaky conductive fine particles having a thickness of 0.5 to 5 μm and an aspect ratio of 1 to 20, an amine-modified polyfunctional oligomer (A) and a nitrogen-containing monofunctional monomer (B), and a polymerization initiator An active energy ray-curable conductive paste, which is a curable conductive paste, containing 50 to 95% by mass of flaky conductive fine particles in the total mass of the paste. The active energy ray-curable conductive paste according to claim 1, wherein the amine-modified polyfunctional oligomer (A) has a hydroxyl group and has a weight average molecular weight of 500 to 2,000. Further, it contains a monomer (C) having at least one structure selected from a cycloolefin structure, a trimethylolpropane-derived structure, a pentaerythritol-derived structure, and a glycerin-derived structure (excluding the oligomer (A) and the monomer (B)). The active energy ray-curable conductive paste according to claim 1 or 2.   Furthermore, the active energy ray hardening-type electrically conductive paste in any one of Claims 1-3 containing an aluminum chelate compound. The active energy ray-curable conductive paste according to any one of claims 1 to 4, which is for screen printing.   The wiring board which has a conductive layer formed from the active energy ray hardening-type conductive paste in any one of Claims 1-5 on a base material. An electronic device comprising the wiring board according to claim 6.

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