JP2016005909A - Laminated body and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated body which has a conductive layer having high adhesiveness with a substrate provided on the substrate; and electronic equipment using the laminated body.SOLUTION: In a laminated body 1 having a conductive layer 13 provided on a substrate 11 through a receiving layer 12, the substrate 11 contains glass, the receiving layer 12 contains a resin having a nitrogen atom and a hydroxyl group, and the conductive layer 13 has a volume resistivity of 6 μΩ cm or less.

Description

  The present invention relates to a laminate in which a conductive layer is provided on a base material via a receiving layer, and an electronic device using the laminate.

  Laminates in which a conductive layer is provided on a substrate are widely used in various fields. For example, if a conductive layer is patterned, it can be used as a circuit board in the field of electronic devices such as communication devices. Has been. In such a laminate, various materials such as silver and copper are selected as the material of the conductive layer depending on the use of the laminate.

The conductive layer is usually prepared by preparing a metal ink composition containing a metal corresponding to the material or a material for forming the conductive layer, and depositing the composition on a substrate, and heating the deposited composition as necessary. It is formed by the method of (baking).
For example, a silver ink composition for forming a silver (metal silver) layer as a conductive layer has recently been disclosed in which silver β-ketocarboxylate is blended (see Patent Document 1). The silver ink composition is extremely useful because it can form a conductive layer of better quality than the silver ink compositions that have been widely used so far, and more quickly form a conductive layer.

JP 2009-114232 A

  However, with respect to conventional conductive layers including those formed from the silver ink composition described in Patent Document 1, further improvement in adhesion to the substrate is desired.

  This invention is made | formed in view of the said situation, and provides the laminated body by which the electroconductive layer with high adhesiveness with the said base material was provided on the base material, and the electronic device using the said laminated body. Is an issue.

In order to solve the above problems, the present invention provides a conductive layer on a substrate via a receptor layer, the substrate includes glass, the receptor layer includes a resin having a nitrogen atom and a hydroxyl group, A laminate having a volume resistivity of a conductive layer of 6 μΩ · cm or less is provided.
The laminate of the present invention preferably satisfies Class 0 in the adhesion test of the base material, the receiving layer and the receiving layer and the conductive layer in accordance with JIS K 5600-5-6.
In addition, the present invention provides an electronic apparatus using the laminate and including the base material as a casing.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated body by which the electroconductive layer with high adhesiveness with the said base material was provided on the base material, and the electronic device using the said laminated body are provided.

It is a schematic sectional drawing which illustrates the layered product concerning the present invention. It is a schematic sectional drawing for demonstrating the manufacturing method of the laminated body which concerns on this invention.

<< Laminate >>
In the laminate according to the present invention, a conductive layer is provided on a substrate via a receptor layer, the substrate includes glass, the receptor layer includes a resin having a nitrogen atom and a hydroxyl group, The volume resistivity is 6 μΩ · cm or less.
The laminate includes a receiving layer containing a specific range of resin having a nitrogen atom and a hydroxyl group, and the base material includes a specific range of material called glass, so that the conductive layer and the base material have excellent adhesion. It will be a thing. It is presumed that nitrogen atoms in the resin mainly contribute to improvement in adhesion between the receptor layer and the conductive layer, and hydroxyl groups in the resin mainly contribute to improvement in adhesion between the substrate and the reception layer.

FIG. 1 is a schematic cross-sectional view illustrating a laminated body according to the present invention.
The laminated body 1 shown here includes a conductive layer 13 on a base material 11 with a receiving layer 12 interposed. That is, the laminate 1 is obtained by laminating the receiving layer 12 and the conductive layer 13 on the base material 11 in this order.

<Base material>
The substrate 11 is preferably in the form of a film or a sheet, the thickness is preferably 12 to 5000 μm, and more preferably 12 to 2000 μm. When the thickness of the base material 11 is not less than the lower limit value, the structure of the receiving layer can be more stably maintained, and when the thickness of the base material 11 is not more than the upper limit value, the receiving layer and the conductive layer are formed. The handling at the time becomes better.

  The base material 11 includes glass, and may be made of glass, or may be made of glass and components other than glass.

When the substrate 11 is composed of glass and a component other than glass, the component other than the glass in the substrate 11 may be only one type, two or more types, or two or more types. Combinations and ratios can be arbitrarily adjusted.
Examples of the components other than the glass include resins, and more specifically, epoxy resins and polyamides are preferable, and polyamides are preferable.

In the case where the substrate 11 is made of glass and components other than glass, the glass may be, for example, either particulate or fibrous, but is preferably fibrous.
The glass content of the substrate 11 is preferably 10% by mass or more, more preferably 30% by mass or more, and particularly preferably 50% by mass or more. The adhesiveness of the base material 11 and the conductive layer 13 (receiving layer 12) improves more because glass content is more than the said lower limit.
Moreover, 100 mass% may be sufficient as content of the glass of the base material 11, it is preferable that it is 95 mass% or less, and it is more preferable that it is 90 mass% or less. The base material 11 expresses the effect by containing components other than glass more notably because content of glass is below the said upper limit.

The substrate 11 may be composed of a single layer, or may be composed of two or more layers. When the base material 11 consists of multiple layers, these multiple layers may be the same as or different from each other. That is, all the layers may be the same, all the layers may be different, or only some of the layers may be different. And when several layers differ from each other, the combination of these several layers is not specifically limited. Here, the plurality of layers being different from each other means that at least one of the material and the thickness of each layer is different from each other.
In addition, when the base material 11 consists of multiple layers, it is good to make it the thickness of the total of each layer be the thickness of said preferable base material 11.

<Receptive layer>
The receiving layer 12 improves the adhesion between the base material 11 and the conductive layer 13. That is, in the laminate 1, the receiving layer 12 and the conductive layer 13, and the receiving layer 12 and the base material 11 each have high adhesion, and the conductive layer 13 provided via the receiving layer 12 is separated from the base material 11. Peeling is remarkably suppressed.

  The shape of the receiving layer 12 when the laminate 1 is viewed in plan so that one main surface (surface on which the receiving layer 12 is formed) 11a of the base material 11 is looked down from above is arbitrarily selected according to the purpose. It can be set and may be set in consideration of the shape of the conductive layer 13 described later. For example, the receiving layer 12 may be provided on the entire surface of the base material 11, or the receiving layer 12 may be provided on only a part of the surface of the base material 11. May be patterned.

The receiving layer 12 includes a resin having a nitrogen atom and a hydroxyl group. The resin is a main component mainly constituting the receiving layer 12.
The resin has a nitrogen atom (N) as a constituent component, and may have, for example, a nitrogen atom in the main chain or in a side chain, in the main chain and on the side. You may have both in a chain.
The resin has a hydroxyl group (-OH). For example, the hydroxyl group may be bonded to the main chain, may be bonded to the side chain, or bonded to both the main chain and the side chain. May be.
The number of nitrogen atoms and hydroxyl groups of the resin may be only one per molecule, or two or more. And the position of the nitrogen atom and the hydroxyl group in the resin is not particularly limited.
In the present specification, the simple description of “the resin” means “resin having a nitrogen atom and a hydroxyl group contained in the receiving layer” unless otherwise specified.

The resin may be one obtained by polymerizing one kind of monomer, or may be one obtained by polymerizing two or more kinds of monomers, or a combination of these monomers when two or more kinds of monomers are polymerized. And the ratio can be adjusted arbitrarily.
The monomer having a nitrogen atom and a hydroxyl group constituting the resin is not particularly limited, and the monomer having a nitrogen atom and the monomer having a hydroxyl group may be different from each other, and one monomer molecule is a nitrogen atom and a hydroxyl group. You may have both.

The resin is preferably polyester.
The polyester may be a polymer (resin) having a structure obtained by polymerization (polycondensation) of a polycarboxylic acid such as dicarboxylic acid and a polyhydric alcohol such as diol. Specifically, polyethylene terephthalate (PET ), Polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), and the like, but are not limited thereto.
The polyester may be obtained by polymerizing other monomers in addition to the polyvalent carboxylic acid and polyhydric alcohol. And any of the said polyhydric carboxylic acid, polyhydric alcohol, and other monomers which comprise polyester may have a nitrogen atom and a hydroxyl group.

  The resin has an aromatic ring skeleton such as a benzene ring skeleton (a group formed by removing one or more hydrogen atoms from benzene) or a naphthalene ring skeleton (a group formed by removing one or more hydrogen atoms from naphthalene) in the structure. Those having (aromatic group) are preferred, and those having an aromatic hydrocarbon ring skeleton (aromatic hydrocarbon group) are more preferred. The polyester preferably has an aromatic ring skeleton in the main chain.

  The resin preferably has a glass transition point (Tg) of 30 to 95 ° C, and more preferably 50 to 90 ° C.

The resin preferably has a weight average molecular weight of 30,000 to 60,000, and more preferably 40,000 to 50,000.
In addition, in this specification, the weight average molecular weight of various resin (polymer) is calculated | required on the polystyrene conversion basis by GPC (gel permeation chromatography).

  The said resin which the receiving layer 12 contains may be only 1 type, may be 2 or more types, and when it is 2 or more types, those combinations and ratios can be adjusted arbitrarily.

  In the receiving layer 12, the content of the resin (the amount of the resin in the receiving layer 12 with respect to the total amount of the receiving layer 12) is preferably 50% by mass or more, and more preferably 60% by mass or more. It is especially preferable that it is 70 mass% or more, and 100 mass% may be sufficient. When the content of the resin in the receiving layer 12 is within such a range, the adhesiveness between the base material 11 and the conductive layer 13 (that is, the adhesiveness between the receiving layer 12 and the base material 11, the receiving layer 12 and the conductive layer 13). ) Is further improved.

In addition to the resin, the receiving layer 12 may contain other components not corresponding to the resin.
The other components included in the receiving layer 12 are not particularly limited and can be arbitrarily selected according to the purpose. Examples thereof include pigments, dyes, and other resins other than the resins.

Known pigments and dyes in the other components can be used.
The other resin in the other components is not particularly limited as long as it is other than the resin. For example, any of a thermoplastic resin and a thermosetting resin may be used.

  The other component contained in the receiving layer 12 may be only one kind, or two or more kinds, and in the case of two or more kinds, the combination and ratio thereof can be arbitrarily adjusted.

In the receiving layer 12, the content of the other components is preferably 50% by mass or less, more preferably 40% by mass or less, particularly preferably 30% by mass or less, and 0% by mass. May be. When the content of the other components in the receiving layer 12 is within such a range, the adhesion between the base material 11 and the conductive layer 13 is further improved.
Further, the receiving layer 12 has a ratio of the content of the other resin to the content of the resin ([content of the other resin (mass%)] / [content of the resin (mass%)] × 100. ) Is preferably 10% by mass or less, more preferably 5% by mass or less, particularly preferably 3% by mass or less, and may be 0% by mass. By the said ratio being such a range, the adhesiveness of the base material 11 and the conductive layer 13 improves more.

  The thickness of the receiving layer 12 is preferably 0.001 to 50 μm, and more preferably 0.002 to 40 μm. By being more than a lower limit, the adhesiveness of the conductive layer 13 improves more, and by being below an upper limit, the structure of a receiving layer can be hold | maintained more stably.

<Conductive layer>
The material of the conductive layer 13 is not particularly limited as long as it has conductivity. However, from the viewpoint that a conductive layer having a low resistance value can be easily formed, a simple metal such as silver or copper, or an alloy (hereinafter, these are summarized). And may be abbreviated as “metal”), and is preferably silver or copper.

The shape of the conductive layer 13 when the laminate 1 is viewed in plan so that one main surface 11a of the substrate 11 is looked down from above can be arbitrarily set according to the purpose, and the entire surface 12a of the receiving layer 12 can be set. The conductive layer 13 may be provided, or the conductive layer 13 may be provided on only a part of the surface 12a of the receiving layer 12. In this case, the conductive layer 13 may be patterned. .
The patterned conductive layer 13 is useful as a wiring, for example.

  Although the thickness of the conductive layer 13 can be arbitrarily set according to the purpose, it is preferably 3 nm to 40 μm, and more preferably 4 nm to 30 μm. When the thickness of the conductive layer 13 is equal to or more than the lower limit value, the conductivity can be further improved, and the structure of the conductive layer 13 can be more stably maintained. Moreover, the laminated body 1 can be made thinner by the thickness of the conductive layer 13 being the upper limit or less.

  The conductive layer 13 may be composed of a single layer, or may be composed of two or more layers. When the conductive layer 13 includes a plurality of layers, the plurality of layers may be the same as or different from each other, and can be configured in the same manner as in the case of the substrate 11. For example, the conductive layer 13 composed of a plurality of layers may be configured such that the total thickness of the respective layers is equal to the thickness of the preferable conductive layer 13 described above.

The surface roughness of the conductive layer 13 is preferably 500 or less, more preferably 400 or less, and particularly preferably 300 or less. The lower limit of the surface roughness of the conductive layer 13 is not particularly limited, and is usually 0.5.
The “surface roughness” here is based on JIS B0601: 2001 (ISO4287: 1997), means arithmetic average roughness (Ra), and is based on the direction of the average line from the roughness curve. When only the length l is extracted, the X axis is taken in the direction of the average line of the extracted portion, the Y axis is taken in the direction of the vertical magnification, and the roughness curve is expressed by y = Z (x), the following formula ( The value obtained by II) is displayed in nanometer (nm) units.

  The conductive layer 13 has excellent conductivity and has a volume resistivity of 6 μΩ · cm or less, for example, 5.5 μΩ · cm or less, 5 μΩ · cm or less, 4.5 μΩ · cm or less, 4 μΩ · cm or less, 3.5 μΩ.・ It may be any one of cm or less, 3 μΩ · cm or less, and 2.7 μΩ · cm or less. The volume resistivity of the conductive layer 13 can be adjusted by the material and thickness of the conductive layer 13.

  Since the laminated body 1 includes the receiving layer 12, the adhesion between the base material 11 and the conductive layer 13 is high. For example, the base material 11 and the conductive layer conforming to “JIS K 5600-5-6” are provided. It is possible to satisfy classification 0 in the 13 adhesion test. That is, in the adhesion test based on “JIS K 5600-5-6”, the laminate 1 has the adhesion between the substrate 11 and the receiving layer 12 and the adhesion between the receiving layer 12 and the conductive layer 13. Can also satisfy Category 0.

The laminate according to the present invention is not limited to that shown in FIG. 1, and other configurations may be added or some configurations may be appropriately changed within a range not impairing the effects of the present invention. For example, the laminate according to the present invention may be one in which other layers other than the receiving layer 12 and the conductive layer 13 are provided on the base material 11. As the other layers, the receiving layer 12 and the conductive layer 13 are provided. An overcoat layer (not shown) to be coated can be exemplified.
In addition, here, the laminated body 1 is shown having the conductive layer 13 on one main surface 11a of the base material 11 via the receiving layer 12, but the laminated body according to the present invention is the base body 11. Similarly, the other main surface 11b may be provided with the conductive layer 13 via the receiving layer 12 (on both main surfaces of the substrate 11).

<< Manufacturing Method of Laminate >>
The laminate according to the present invention includes, for example, a step of forming a receiving layer on a substrate (hereinafter, sometimes abbreviated as “receiving layer forming step”) and a step of forming a conductive layer on the receiving layer ( Hereinafter, it may be abbreviated as “conductive layer forming step”).
FIG. 2 is a schematic cross-sectional view for explaining a method of manufacturing the laminate 1 shown in FIG.

<Receptive layer forming step>
In order to manufacture the laminated body 1, first, as shown in FIG.2 (b), the receiving layer 12 is formed on the surface (one main surface) 11a of the base material 11. As shown in FIG.
The receiving layer 12 is prepared, for example, by preparing a composition in which the resin, the solvent, and other components as necessary are blended (hereinafter may be abbreviated as “receiving layer composition”). It can be formed by depositing on the base material 11 and performing post-processing such as drying and heating. The heat treatment may also serve as a drying treatment. Here, the polyester and other components are the same as those described above as the components included in the receiving layer 12. Instead of the other components, precursors of other components that change to the other components when the receiving layer 12 is formed may be used.

The solvent is not particularly limited as long as it does not impair the effects of the present invention. Preferred solvents include aromatic hydrocarbons such as toluene, o-xylene, m-xylene and p-xylene; fats such as hexane, heptane and octane. Group hydrocarbons; alcohols such as ethanol and 2-propanol; halogenated hydrocarbons such as dichloromethane and chloroform; esters such as ethyl acetate, monomethyl glutarate and dimethyl glutarate; diethyl ether, tetrahydrofuran (THF), 1,2-dimethoxy Examples include ethers such as ethane (dimethyl cellosolve); ketones such as acetone, methyl ethyl ketone (MEK) and cyclohexanone; nitriles such as acetonitrile; amides such as N, N-dimethylformamide (DMF) and N, N-dimethylacetamide. To these Not a constant.
The said solvent may be used individually by 1 type, may use 2 or more types together, and when using 2 or more types together, those combinations and ratios can be adjusted arbitrarily.

  In the composition for the receiving layer, the ratio of the amount of the solvent to the total amount of the compounding components is preferably 30 to 85% by mass, and more preferably 40 to 75% by mass.

If the non-volatile components in the receiving layer composition do not change when the receiving layer 12 is formed, the content ratio of the non-volatile components in the receiving layer composition is the same in the receiving layer. It becomes.
Therefore, for example, in the composition for the receiving layer, the ratio of the blending amount of the other resin to the blending amount of the resin (the blending amount of the other resin (mass)] / [the blending amount of the resin (mass)]. × 100) is preferably 10% by mass or less, more preferably 5% by mass or less, particularly preferably 3% by mass or less, and may be 0% by mass.
Further, in the composition for the receiving layer, the ratio of the blending amount of the other components to the total amount of the blending components other than the solvent is preferably 50% by mass or less, more preferably 40% by mass or less, 30 The content is particularly preferably at most mass%, and may be 0 mass%.

  The composition for a receiving layer is obtained, for example, by blending the polyester, a solvent, and other components as necessary. After the blending of each component, the obtained product may be used as it is as the composition for the receiving layer, or the product obtained by performing a known purification operation as necessary may be used as the composition for the receiving layer.

At the time of blending each component, all the components may be added and then mixed, or some components may be mixed while being added sequentially, or all components may be mixed while being added sequentially. Good.
The mixing method is not particularly limited, a method of mixing by rotating a stirrer or a stirring blade; a method of mixing using a mixer, a three-roller, a kneader, a bead mill or the like; a method of mixing by adding ultrasonic waves, etc. What is necessary is just to select suitably from a well-known method.

  In the composition for the receiving layer, all the compounding components may be dissolved, or a part of the components may be dispersed without dissolving, but it is preferable that all the compounding components are dissolved, It is preferable that the components which are not dissolved are uniformly dispersed. In the case of uniformly dispersing the undissolved component, for example, it is preferable to apply a method of dispersing using the above-described three-roll, kneader or bead mill.

The temperature at the time of blending is not particularly limited as long as each blending component does not deteriorate, but it is preferably 15 to 35 ° C. And the temperature at the time of mixing | blending is good to adjust suitably so that the mixture obtained by mix | blending may become the viscosity which is easy to stir according to the kind and quantity of a mixing | blending component.
The blending time is not particularly limited as long as each blending component does not deteriorate, but it is preferably 5 minutes to 2 hours.

  The receiving layer composition may be a commercially available product as long as it satisfies the above-described conditions.

The composition for receiving layer can be made to adhere on the base material 11 by well-known methods, such as a printing method, the apply | coating method, and the immersion method, for example.
Examples of the printing method include screen printing method, flexographic printing method, offset printing method, dip printing method, ink jet printing method, dispenser printing method, gravure printing method, gravure offset printing method, pad printing method and the like.
Examples of the coating method include spin coaters, air knife coaters, curtain coaters, die coaters, blade coaters, roll coaters, gate roll coaters, bar coaters, rod coaters, gravure coaters, and other methods such as wire bars. It can be illustrated.

  In the receptive layer forming step, the thickness of the receptive layer 12 is adjusted by adjusting the amount of the receptive layer composition to be deposited on the substrate 11 or the amount of components other than the solvent in the receptive layer composition. it can.

  The receptor layer composition may be dried and heated by any known method, for example, under normal pressure, reduced pressure, or blowing conditions, and may be performed in air or in an inert gas atmosphere. Any of these may be used. The treatment temperature is not particularly limited, and may be set as appropriate according to the purpose. For example, the drying process may be either a heat drying process or a room temperature drying process. In the case of the heat drying process, for example, the drying process may be preferably performed at 60 to 230 ° C. for 2 to 60 minutes.

In the receiving layer forming step, the substrate 11 may be subjected to heat treatment (annealing treatment) before the receiving layer composition is adhered. By heat-treating the base material 11, when the metal ink composition is heat-treated (fired) in the conductive layer forming step described later, shrinkage of the base material 11 is suppressed and dimensional stability is improved.
The conditions for the heat treatment of the base material 11 before adhering the composition for the receiving layer may be appropriately adjusted according to the type of the base material 11 and are not particularly limited, but are heated at 60 to 200 ° C. for 10 to 60 minutes. It is preferable to perform the treatment, which may be the same as the heating (firing) treatment conditions of the metal ink composition in the conductive layer forming step.

Moreover, in this invention, you may plasma-process the formation surface of the receiving layer 12 of the base material 11 before making the composition for receiving layers adhere. By subjecting the substrate 11 to plasma treatment, bleeding of the metal ink composition may be suppressed on the receiving layer 12 in the conductive layer forming step described later.
The plasma treatment may be performed by a known method. For example, in the case of atmospheric pressure plasma treatment, it can be performed under conditions of a voltage of 290 to 300 W, an air velocity of 1.0 to 5.0 m / min, and the like.

<Conductive layer formation process>
In order to manufacture the laminated body 1, next, as shown in FIG. 2C, the conductive layer 13 is formed on the surface (main surface) 12 a of the receiving layer 12.
The conductive layer 13 is prepared by preparing a composition for forming the conductive layer 13 (hereinafter sometimes abbreviated as “composition for conductive layer”), and attaching the composition to a desired location on the receiving layer 12. It can be formed by appropriately selecting post-treatment such as heat treatment (baking). The heat treatment may be performed also as a drying treatment.
The conductive layer 13 is prepared by preparing a composition for the conductive layer, adhering it to a predetermined portion or the entire surface of the receiving layer 12, and appropriately selecting post-treatment such as drying treatment or heating (firing) treatment. Then, after forming a conductive layer (a conductive layer before patterning, not shown), this conductive layer can be patterned into a desired shape by a known method such as etching.

When the material of the conductive layer 13 is a metal, a metal ink composition in which a metal or a metal forming material is blended is prepared as a composition for the conductive layer, and this is deposited on the receiving layer 12, It is preferable to form the conductive layer 13 by appropriately selecting a solidification process such as a drying process or a heating (firing) process.
The metal forming material in the metal ink composition may be only one kind or two or more kinds, and in the case of two or more kinds, the combination and ratio can be arbitrarily adjusted.

The metal (single metal or alloy) to be blended is preferably in the form of particles or fibers (tube shape, wire shape, etc.), more preferably nanoparticles or nanowires, silver nanoparticles, silver nanoparticles Particularly preferred are wires, copper nanoparticles or copper nanowires.
In the present specification, “nanoparticle” means a particle having a particle size of 1 nm or more and less than 1000 nm, preferably 1 to 100 nm, and “nanowire” means a width of 1 nm or more and less than 1000 nm, preferably It means a wire that is 1 to 100 nm.

The metal forming material to be blended may be any material that has a corresponding metal atom (element) and generates a metal by structural change such as decomposition, such as a metal salt, a metal complex, an organometallic compound (metal-carbon bond). And the like. The metal salt and the metal complex may be any of a metal compound having an organic group and a metal compound having no organic group. Among these, the metal forming material is preferably a metal salt, and more preferably a silver salt or a copper salt.
By using a metal forming material, a metal is generated from the material, and the conductive layer 13 containing the metal is formed. In this case, the conductive layer 13 is mainly composed of the metal, and the ratio of the metal is sufficiently high so that it can be considered to be composed of only the metal. The ratio of the metal in the conductive layer 13 is preferably Is 99% by mass or more. The upper limit of the ratio of the metal in the conductive layer 13 is, for example, 99.9% by mass, 99.8% by mass, 99.7% by mass, 99.6% by mass, 99.5% by mass, 99.4% by mass. , 99.3% by mass, 99.2% by mass, and 99.1% by mass.

  As the metal ink composition, a liquid one is preferable, and one in which the metal forming material is uniformly dispersed is preferable.

Hereinafter, a method for forming the conductive layer 13 in the case where a silver ink composition containing a metal silver forming material is used as the metal ink composition will be described. The same applies to the case where the metal species is other than silver. The conductive layer 13 can be formed by the method.
The metallic silver forming material is decomposed by heating or the like to form metallic silver.

[Silver carboxylate]
Examples of the metal silver forming material include silver carboxylate having a group represented by the formula “—COOAg”.
In this invention, silver carboxylate may be used individually by 1 type, and may use 2 or more types together. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.
The silver carboxylate is not particularly limited as long as it has a group represented by the formula “—COOAg”. For example, the number of groups represented by the formula “—COOAg” may be only one, or two or more. Further, the position of the group represented by the formula “—COOAg” in the silver carboxylate is not particularly limited.

The silver carboxylate is represented by the following general formula (1) β-ketocarboxylate silver (hereinafter sometimes abbreviated as “β-ketocarboxylate (1)”) and the following general formula (4). It is preferably one or more selected from the group consisting of silver carboxylates (hereinafter sometimes abbreviated as “silver carboxylate (4)”).
In the present specification, the simple description of “silver carboxylate” is not limited to “silver β-ketocarboxylate (1)” and “silver carboxylate (4)”, unless otherwise specified. It is intended to mean “silver carboxylate having a group represented by the formula“ —COOAg ””.

（式中、Ｒは１個以上の水素原子が置換基で置換されていてもよい炭素数１〜２０の脂肪族炭化水素基若しくはフェニル基、水酸基、アミノ基、又は一般式「Ｒ^１−ＣＹ^１ _２−」、「ＣＹ^１ _３−」、「Ｒ^１−ＣＨＹ^１−」、「Ｒ^２Ｏ−」、「Ｒ^５Ｒ^４Ｎ−」、「（Ｒ^３Ｏ）_２ＣＹ^１−」若しくは「Ｒ^６−Ｃ（＝Ｏ）−ＣＹ^１ _２−」で表される基であり；
Ｙ^１はそれぞれ独立にフッ素原子、塩素原子、臭素原子又は水素原子であり；Ｒ^１は炭素数１〜１９の脂肪族炭化水素基又はフェニル基であり；Ｒ^２は炭素数１〜２０の脂肪族炭化水素基であり；Ｒ^３は炭素数１〜１６の脂肪族炭化水素基であり；Ｒ^４及びＲ^５はそれぞれ独立に炭素数１〜１８の脂肪族炭化水素基であり；Ｒ^６は炭素数１〜１９の脂肪族炭化水素基、水酸基又は式「ＡｇＯ−」で表される基であり；
Ｘ^１はそれぞれ独立に水素原子、炭素数１〜２０の脂肪族炭化水素基、ハロゲン原子、１個以上の水素原子が置換基で置換されていてもよいフェニル基若しくはベンジル基、シアノ基、Ｎ−フタロイル−３−アミノプロピル基、２−エトキシビニル基、又は一般式「Ｒ^７Ｏ−」、「Ｒ^７Ｓ−」、「Ｒ^７−Ｃ（＝Ｏ）−」若しくは「Ｒ^７−Ｃ（＝Ｏ）−Ｏ−」で表される基であり；
Ｒ^７は、炭素数１〜１０の脂肪族炭化水素基、チエニル基、又は１個以上の水素原子が置換基で置換されていてもよいフェニル基若しくはジフェニル基である。）

(In the formula, R represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms, a phenyl group, a hydroxyl group, an amino group, or a general formula “R ¹ -CY” in which one or more hydrogen atoms may be substituted with a substituent. ¹ ₂ − ”,“ CY ¹ ₃ − ”,“ R ¹ —CHY ¹ — ”,“ R ² O— ”,“ R ⁵ R ⁴ N— ”,“ (R ³ O) ₂ CY ¹ — ”or“ R ⁶ —C (═O) —CY ¹ ₂ — ”;
Y ¹ is each independently a fluorine atom, a chlorine atom, a bromine atom or a hydrogen atom; R ¹ is an aliphatic hydrocarbon group having 1 to 19 carbon atoms or a phenyl group; R ² is an aliphatic having 1 to 20 carbon atoms R ³ is an aliphatic hydrocarbon group having 1 to 16 carbon atoms; R ⁴ and R ⁵ are each independently an aliphatic hydrocarbon group having 1 to 18 carbon atoms; R ⁶ is An aliphatic hydrocarbon group having 1 to 19 carbon atoms, a hydroxyl group or a group represented by the formula “AgO—”;
X ¹ is independently a hydrogen atom, an aliphatic hydrocarbon group having 1 to 20 carbon atoms, a halogen atom, a phenyl group or benzyl group in which one or more hydrogen atoms may be substituted with a substituent, a cyano group, N - phthaloyl-3-aminopropyl group, 2-ethoxyethyl vinyl group, or the general formula ^{"R 7} O -", ^{"R 7} S -", ^"R 7 -C (= O) -" or ^"R 7 -C ( ═O) —O— ”;
R ⁷ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms, a thienyl group, or a phenyl group or diphenyl group in which one or more hydrogen atoms may be substituted with a substituent. )

（式中、Ｒ^８は炭素数１〜１９の脂肪族炭化水素基、カルボキシ基又は式「−Ｃ（＝Ｏ）−ＯＡｇ」で表される基であり、前記脂肪族炭化水素基がメチレン基を有する場合、１個以上の該メチレン基はカルボニル基で置換されていてもよい。）

(In the formula, R ⁸ is an aliphatic hydrocarbon group having 1 to 19 carbon atoms, a carboxy group or a group represented by the formula “—C (═O) —OAg”, and the aliphatic hydrocarbon group is a methylene group. And one or more of the methylene groups may be substituted with a carbonyl group.)

(Silver β-ketocarboxylate (1))
The β-ketocarboxylate silver (1) is represented by the general formula (1).
In the formula, R represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms, a phenyl group, a hydroxyl group, an amino group, or a general formula “R ¹ -CY ¹ ” in which one or more hydrogen atoms may be substituted with a substituent. " _2- ", "CY ¹ _3- ", "R ¹ -CHY ^1- ", "R ² O-", "R ⁵ R ⁴ N-", "(R ³ O) ₂ CY ^1- " or "R ^6- C (═O) —CY ¹ ₂ — ”.

  The aliphatic hydrocarbon group having 1 to 20 carbon atoms in R may be any of linear, branched and cyclic (aliphatic cyclic group), and when it is cyclic, it may be monocyclic or polycyclic. . Further, the aliphatic hydrocarbon group may be either a saturated aliphatic hydrocarbon group or an unsaturated aliphatic hydrocarbon group. The aliphatic hydrocarbon group preferably has 1 to 10 carbon atoms, and more preferably 1 to 6 carbon atoms. Preferred examples of the aliphatic hydrocarbon group for R include an alkyl group, an alkenyl group, and an alkynyl group.

Examples of the linear or branched alkyl group represented by R include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n -Pentyl group, isopentyl group, neopentyl group, tert-pentyl group, 1-methylbutyl group, 2-methylbutyl group, n-hexyl group, 1-methylpentyl group, 2-methylpentyl group, 3-methylpentyl group, 4- Methylpentyl group, 1,1-dimethylbutyl group, 2,2-dimethylbutyl group, 3,3-dimethylbutyl group, 2,3-dimethylbutyl group, 1-ethylbutyl group, 2-ethylbutyl group, 3-ethylbutyl group 1-ethyl-1-methylpropyl group, n-heptyl group, 1-methylhexyl group, 2-methylhexyl group, 3-methylhexyl group, -Methylhexyl group, 5-methylhexyl group, 1,1-dimethylpentyl group, 2,2-dimethylpentyl group, 2,3-dimethylpentyl group, 2,4-dimethylpentyl group, 3,3-dimethylpentyl group 4,4-dimethylpentyl group, 1-ethylpentyl group, 2-ethylpentyl group, 3-ethylpentyl group, 4-ethylpentyl group, 2,2,3-trimethylbutyl group, 1-propylbutyl group, n -Octyl group, isooctyl group, 1-methylheptyl group, 2-methylheptyl group, 3-methylheptyl group, 4-methylheptyl group, 5-methylheptyl group, 1-ethylhexyl group, 2-ethylhexyl group, 3-ethylhexyl Group, 4-ethylhexyl group, 5-ethylhexyl group, 1,1-dimethylhexyl group, 2,2-dimethylhexyl group, 3, -Dimethylhexyl group, 4,4-dimethylhexyl group, 5,5-dimethylhexyl group, 1-propylpentyl group, 2-propylpentyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group And pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group and icosyl group.
Examples of the cyclic alkyl group in R include cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, cyclononyl group, cyclodecyl group, norbornyl group, isobornyl group, 1-adamantyl group, 2- Examples thereof include an adamantyl group and a tricyclodecyl group.

Examples of the alkenyl group in R include a vinyl group (ethenyl group, —CH═CH ₂ ), an allyl group (2-propenyl group, —CH ₂ —CH═CH ₂ ), and a 1-propenyl group (—CH═CH—CH). ₃ ), isopropenyl group (—C (CH ₃ ) ═CH ₂ ), 1-butenyl group (—CH═CH—CH ₂ —CH ₃ ), 2-butenyl group (—CH ₂ —CH═CH—CH _3). ), 3-butenyl group (—CH ₂ —CH ₂ —CH═CH ₂ ), cyclohexenyl group, cyclopentenyl group and the like, one single bond (C—C) between carbon atoms of the alkyl group in R Is a group in which is substituted with a double bond (C═C).
As the alkynyl group in R, one single bond (C—C) between carbon atoms of the alkyl group in R, such as ethynyl group (—C≡CH), propargyl group (—CH ₂ —C≡CH) and the like. ) Is substituted with a triple bond (C≡C).

  In the aliphatic hydrocarbon group having 1 to 20 carbon atoms in R, one or more hydrogen atoms may be substituted with a substituent, and preferred examples of the substituent include a fluorine atom, a chlorine atom, and a bromine atom. . Moreover, the number and position of substituents are not particularly limited. When the number of substituents is plural, the plural substituents may be the same as or different from each other. That is, all the substituents may be the same, all the substituents may be different, or only some of the substituents may be different.

The phenyl group in R may have one or more hydrogen atoms substituted with a substituent, and the preferred substituent is a saturated or unsaturated monovalent aliphatic hydrocarbon group having 1 to 16 carbon atoms. , A monovalent group formed by bonding the aliphatic hydrocarbon group to an oxygen atom, a fluorine atom, a chlorine atom, a bromine atom, a hydroxyl group (—OH), a cyano group (—C≡N), a phenoxy group (—O— C ₆ H ₅ ) and the like can be exemplified, and the number and position of substituents are not particularly limited. When the number of substituents is plural, the plural substituents may be the same as or different from each other.
Examples of the aliphatic hydrocarbon group that is a substituent include the same aliphatic hydrocarbon groups as those described above for R except that the number of carbon atoms is 1 to 16.

Y ^{1 in} R is independently a fluorine atom, a chlorine atom, a bromine atom or a hydrogen atom. In the general formulas “R ¹ —CY ¹ ₂ —”, “CY ¹ ₃ —” and “R ⁶ —C (═O) —CY ¹ ₂ —”, a plurality of Y ¹ may be the same as each other. May be different.

R ¹ in R is an aliphatic hydrocarbon group having 1 to 19 carbon atoms or a phenyl group (C ₆ H ₅ —), and the aliphatic hydrocarbon group in R ¹ has 1 to 19 carbon atoms. Except for this point, the same aliphatic hydrocarbon groups as those in R can be exemplified.
R ² in R is an aliphatic hydrocarbon group having 1 to 20 carbon atoms, and examples thereof are the same as the aliphatic hydrocarbon group in R.
R ³ in R is an aliphatic hydrocarbon group having 1 to 16 carbon atoms, and examples thereof are the same as the aliphatic hydrocarbon group in R except that the carbon number is 1 to 16.
R ⁴ and R ⁵ in R are each independently an aliphatic hydrocarbon group having 1 to 18 carbon atoms. That is, R ⁴ and R ⁵ may be the same as or different from each other, and examples thereof are the same as the aliphatic hydrocarbon group in R except that the number of carbon atoms is 1 to 18.
R ⁶ in R is an aliphatic hydrocarbon group having 1 to 19 carbon atoms, a hydroxyl group, or a group represented by the formula “AgO—”, and the aliphatic hydrocarbon group in R ⁶ has 1 to 1 carbon atoms. Except for being 19, the same aliphatic hydrocarbon groups as those described above for R can be exemplified.

R is, among these, a linear or branched alkyl group, the general formula ^{"R 6 -C (= O) -CY} 1 2 - " group represented by be a hydroxyl group or a phenyl group preferable. R ⁶ is preferably a linear or branched alkyl group, a hydroxyl group, or a group represented by the formula “AgO—”.

In the general formula (1), each X ¹ is independently a hydrogen atom, an aliphatic hydrocarbon group having 1 to 20 carbon atoms, a halogen atom, a phenyl group in which one or more hydrogen atoms may be substituted with a substituent, or A benzyl group (C ₆ H ₅ —CH ₂ —), a cyano group, an N-phthaloyl-3-aminopropyl group, a 2-ethoxyvinyl group (C ₂ H ₅ —O—CH═CH—), or a general formula “R ⁷ O— ”,“ R ⁷ S— ”,“ R ⁷ —C (═O) — ”or“ R ⁷ —C (═O) —O— ”.
Examples of the aliphatic hydrocarbon group having 1 to 20 carbon atoms in X ¹ include those similar to the aliphatic hydrocarbon group in R.

Examples of the halogen atom in X ¹ include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
In the phenyl group and benzyl group in X ¹ , one or more hydrogen atoms may be substituted with a substituent. Preferred examples of the substituent include a halogen atom (a fluorine atom, a chlorine atom, a bromine atom, an iodine atom), nitro group (-NO ₂₎ or the like can be exemplified, the number and position of the substituent is not particularly limited. When the number of substituents is plural, the plural substituents may be the same as or different from each other.

R ⁷ in X ¹ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms, a thienyl group (C ₄ H ₃ S—), a phenyl group in which one or more hydrogen atoms may be substituted with a substituent, or diphenyl group (biphenyl _{group, C 6 H 5 -C 6 H} 4 -) is. Examples of the aliphatic hydrocarbon group for R ⁷ include those similar to the aliphatic hydrocarbon group for R except that the aliphatic hydrocarbon group has 1 to 10 carbon atoms. Further, examples of the substituent of the phenyl group and a diphenyl group in R ^7, halogen atom (fluorine atom, chlorine atom, bromine atom, iodine atom) can be exemplified the like, the number and position of the substituent is not particularly limited. When the number of substituents is plural, the plural substituents may be the same as or different from each other.
When R ⁷ is a thienyl group or a diphenyl group, there are no particular limitations on the bonding position of these groups with an adjacent group or atom (oxygen atom, sulfur atom, carbonyl group, carbonyloxy group) in X ¹ . For example, the thienyl group may be a 2-thienyl group or a 3-thienyl group.

In the general formula (1), two X ^{1 s} may be bonded as one group through a double bond with a carbon atom sandwiched between two carbonyl groups. A group represented by the formula “═CH—C ₆ H ₄ —NO ₂ ” can be exemplified.

X ¹ is preferably a hydrogen atom, a linear or branched alkyl group, a benzyl group, or a group represented by the general formula “R ⁷ —C (═O) —” among the above. It is preferable that at least one X ¹ is a hydrogen atom.

β-ketocarboxylate silver (1) is silver 2-methylacetoacetate (CH ₃ —C (═O) —CH (CH ₃ ) —C (═O) —OAg), silver acetoacetate (CH ₃ —C (= O) —CH ₂ —C (═O) —OAg), silver 2-ethylacetoacetate (CH ₃ —C (═O) —CH (CH ₂ CH ₃ ) —C (═O) —OAg), silver propionyl acetate _{(CH 3 CH 2 -C (=} O) -CH 2 -C (= O) -OAg), isobutyryl silver acetate _{((CH 3) 2 CH-} C (= O) -CH 2 -C (= O) - OAg), silver pivaloyl acetate ((CH ₃ ) ₃ C—C (═O) —CH ₂ —C (═O) —OAg), silver caproyl acetate (CH ₃ (CH ₂ ) ₃ CH ₂ —C (═O) _{) -CH 2 -C (= O)} -OAg), 2-n- Buchiruaseto silver acetate _{(CH 3 -C (= O)} -CH (C _{H 2 CH 2 CH 2 CH 3} ) -C (= O) -OAg), 2- benzyl acetoacetate silver _{(CH 3 -C (= O)} -CH (CH 2 C 6 H 5) -C (= O) -OAg), silver benzoylacetate _{(C 6 H 5 -C (=} O) -CH 2 -C (= O) -OAg), Pibaroiruaseto silver acetate _{((CH 3) 3 C-} C (= O) -CH 2 _{-C (= O) -CH 2 -C} (= O) -OAg), isobutyryl acetoacetate silver _{((CH 3) 2 CH-} C (= O) -CH 2 -C (= O) -CH 2 -C (= O) -OAg), 2- acetyl pivaloyl silver acetate _{((CH 3) 3 C-} C (= O) -CH (-C (= O) -CH 3) -C (= O) -OAg), 2- acetyl isobutyryl silver acetate _{((CH 3) 2 CH-} C (= O) -CH (-C (= O) -CH 3) -C (= O) - Ag), or is preferably acetone dicarboxylic silver _{(AgO-C (= O)} -CH 2 -C (= O) -CH 2 -C (= O) -OAg).

  The β-ketocarboxylate (1) can further reduce the concentration of remaining raw materials and impurities in a conductor (metal silver) formed by a solidification process such as a drying process or a heating (baking) process. The smaller the raw materials and impurities, for example, the better the contact between the formed metal silvers, the easier the conduction, and the lower the resistivity.

  The β-ketocarboxylate (1) is decomposed at a low temperature of preferably 60 to 210 ° C., more preferably 60 to 200 ° C. without using a reducing agent known in the art, as described later, It is possible to form metallic silver. And by using together with a reducing agent, it decomposes at a lower temperature to form metallic silver. The reducing agent will be described later.

  In this invention, (beta) -ketocarboxylate (1) may be used individually by 1 type, and may use 2 or more types together. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

(Silver carboxylate (4))
The silver carboxylate (4) is represented by the general formula (4).
In the formula, R ⁸ is an aliphatic hydrocarbon group having 1 to 19 carbon atoms, a carboxy group (—COOH), or a group represented by the formula “—C (═O) —OAg”.
Examples of the aliphatic hydrocarbon group for R ⁸ include those similar to the aliphatic hydrocarbon group for R except that the aliphatic hydrocarbon group has 1 to 19 carbon atoms. However, the aliphatic hydrocarbon group for R ⁸ preferably has 1 to 15 carbon atoms, and more preferably 1 to 10 carbon atoms.

When the aliphatic hydrocarbon group for R ⁸ has a methylene group (—CH ₂ —), one or more of the methylene groups may be substituted with a carbonyl group. The number and position of the methylene groups that may be substituted with a carbonyl group are not particularly limited, and all methylene groups may be substituted with a carbonyl group. Here, the “methylene group” is not only a single group represented by the formula “—CH ₂ —” but also one alkylene group in which a plurality of groups represented by the formula “—CH ₂ —” are linked. And a group represented by the formula “—CH ₂ —”.

Silver carboxylate (4) is silver pyruvate (CH ₃ —C (═O) —C (═O) —OAg), silver acetate (CH ₃ —C (═O) —OAg), silver butyrate (CH _{3 - (CH 2) 2 -C (} = O) -OAg), isobutyric acid silver _{((CH 3) 2 CH-} C (= O) -OAg), hexane silver 2-ethylhexyl _(CH 3 - _{(CH 2} ) ₃ —CH (CH ₂ CH ₃ ) —C (═O) —OAg), silver neodecanoate (CH ₃ — (CH ₂ ) ₅ —C (CH ₃ ) ₂ —C (═O) —OAg), Shu It is preferably silver oxide (AgO—C (═O) —C (═O) —OAg) or silver malonate (AgO—C (═O) —CH ₂ —C (═O) —OAg). Also, 2 of the silver oxalate (AgO-C (= O) -C (= O) -OAg) and malonic silver _{(AgO-C (= O)} -CH 2 -C (= O) -OAg) Of the groups represented by the formula “—COOAg”, one is a group represented by the formula “—COOH” (HO—C (═O) —C (═O) —OAg, HO) _{-C (= O) -CH 2 -C} (= O) -OAg) it is also preferred.

  As in the case of silver β-ketocarboxylate (1), silver carboxylate (4) is also used in the conductor (metal silver) formed by solidification treatment such as drying treatment or heating (firing) treatment. The concentration can be further reduced. And by using together with a reducing agent, it decomposes at a lower temperature to form metallic silver.

  In this invention, silver carboxylate (4) may be used individually by 1 type, and may use 2 or more types together. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

The silver carboxylate is silver 2-methylacetoacetate, silver acetoacetate, silver 2-ethylacetoacetate, silver propionylacetate, silver isobutyrylacetate, silver pivaloylacetate, silver caproylacetate, silver 2-n-butylacetoacetate, 2-benzylacetoacetate Silver acetate, silver benzoyl acetate, silver pivaloyl acetoacetate, silver isobutyryl acetoacetate, silver acetone dicarboxylate, silver pyruvate, silver acetate, silver butyrate, silver isobutyrate, silver 2-ethylhexanoate, silver neodecanoate, silver It is preferably at least one selected from the group consisting of silver oxide and silver malonate.
Among these silver carboxylates, silver 2-methylacetoacetate and silver acetoacetate are excellent in compatibility with the nitrogen-containing compounds (among others amine compounds) described later, and are particularly suitable for increasing the concentration of silver ink compositions. It is mentioned as a thing.

In the silver ink composition, the content of silver derived from the metal silver forming material is preferably 5% by mass or more, and more preferably 10% by mass or more. By being in such a range, the formed conductor (metal silver) becomes superior in quality. The upper limit of the silver content is not particularly limited as long as the effects of the present invention are not impaired, but it is preferably 25% by mass in consideration of handling properties and the like.
In the present specification, “silver derived from a metallic silver forming material” means silver in the metallic silver forming material blended during the production of the silver ink composition, unless otherwise specified. It is a concept that includes both silver constituting the metal silver forming material after blending, and silver and silver itself in the decomposition product generated by decomposition of the metal silver forming material after blending.

[Nitrogen-containing compounds]
The silver ink composition is preferably one in which a nitrogen-containing compound is further blended in addition to the metal silver forming material, particularly when the metal silver forming material is the silver carboxylate.
The nitrogen-containing compound is an amine compound having 25 or less carbon atoms (hereinafter sometimes abbreviated as “amine compound”), a quaternary ammonium salt having 25 or less carbon atoms (hereinafter abbreviated as “quaternary ammonium salt”). Ammonia, an ammonium salt formed by reacting an amine compound having 25 or less carbon atoms with an acid (hereinafter sometimes abbreviated as “ammonium salt derived from an amine compound”), and ammonia reacting with an acid. One or more selected from the group consisting of ammonium salts (hereinafter sometimes abbreviated as “ammonium salts derived from ammonia”). That is, the nitrogen-containing compound to be blended may be only one kind, or two or more kinds. When two or more kinds are used in combination, the combination and ratio can be arbitrarily adjusted.

(Amine compound, quaternary ammonium salt)
The amine compound has 1 to 25 carbon atoms, and may be any of primary amine, secondary amine, and tertiary amine. The quaternary ammonium salt has 4 to 25 carbon atoms. The amine compound and the quaternary ammonium salt may be either chain or cyclic. Further, the number of nitrogen atoms constituting the amine moiety or ammonium salt moiety (for example, the nitrogen atom constituting the amino group (—NH ₂ ) of the primary amine) may be one, or two or more.

  Examples of the primary amine include monoalkylamines, monoarylamines, mono (heteroaryl) amines, and diamines in which one or more hydrogen atoms may be substituted with a substituent.

The alkyl group constituting the monoalkylamine may be linear, branched or cyclic, and examples thereof are the same as the alkyl group in R, and are linear or branched having 1 to 19 carbon atoms. It is preferably a chain alkyl group or a cyclic alkyl group having 3 to 7 carbon atoms.
Specific examples of preferable monoalkylamine include n-butylamine, n-hexylamine, n-octylamine, n-dodecylamine, n-octadecylamine, isobutylamine, sec-butylamine, tert-butylamine, 3-amino. Examples include pentane, 3-methylbutylamine, 2-heptylamine (2-aminoheptane), 2-aminooctane, 2-ethylhexylamine, and 1,2-dimethyl-n-propylamine.

  Examples of the aryl group constituting the monoarylamine include a phenyl group, a 1-naphthyl group, a 2-naphthyl group, and the like, and preferably has 6 to 10 carbon atoms.

The heteroaryl group constituting the mono (heteroaryl) amine has a heteroatom as an atom constituting the aromatic ring skeleton, and the heteroatom includes a nitrogen atom, a sulfur atom, an oxygen atom, and a boron atom. Can be illustrated. Moreover, the number of the said hetero atom which comprises an aromatic ring frame is not specifically limited, One may be sufficient and two or more may be sufficient. When there are two or more, these heteroatoms may be the same or different from each other. That is, these heteroatoms may all be the same, may all be different, or may be partially different.
The heteroaryl group may be monocyclic or polycyclic, and the number of ring members (the number of atoms constituting the ring skeleton) is not particularly limited, but is preferably a 3- to 12-membered ring.

Examples of the monoaryl group having 1 to 4 nitrogen atoms as the heteroaryl group include pyrrolyl group, pyrrolinyl group, imidazolyl group, pyrazolyl group, pyridyl group, pyrimidyl group, pyrazinyl group, pyridazinyl group, triazolyl group, and tetrazolyl group. , A pyrrolidinyl group, an imidazolidinyl group, a piperidinyl group, a pyrazolidinyl group, and a piperazinyl group are preferable, and a 3- to 8-membered ring is preferable, and a 5- to 6-membered ring is more preferable.
Examples of the monoaryl group having one oxygen atom as the heteroaryl group include a furanyl group, preferably a 3- to 8-membered ring, and more preferably a 5- to 6-membered ring.
Examples of the monoaryl group having one sulfur atom as the heteroaryl group include a thienyl group, preferably a 3- to 8-membered ring, and more preferably a 5- to 6-membered ring.
Examples of the monoaryl group having 1 to 2 oxygen atoms and 1 to 3 nitrogen atoms as the heteroaryl group include an oxazolyl group, an isoxazolyl group, an oxadiazolyl group, and a morpholinyl group. It is preferable that it is a 5- to 6-membered ring.
Examples of the monoaryl group having 1 to 2 sulfur atoms and 1 to 3 nitrogen atoms as the heteroaryl group include a thiazolyl group, a thiadiazolyl group, and a thiazolidinyl group, and a 3- to 8-membered ring. Preferably, it is a 5-6 membered ring.
Examples of the polyaryl group having 1 to 5 nitrogen atoms as the heteroaryl group include indolyl group, isoindolyl group, indolizinyl group, benzimidazolyl group, quinolyl group, isoquinolyl group, indazolyl group, benzotriazolyl group, tetra Examples include a zolopyridyl group, a tetrazolopyridazinyl group, and a dihydrotriazolopyridazinyl group, preferably a 7-12 membered ring, and more preferably a 9-10 membered ring.
Examples of the polyaryl group having 1 to 3 sulfur atoms as the heteroaryl group include a dithiaphthalenyl group and a benzothiophenyl group, preferably a 7 to 12 membered ring, preferably a 9 to 10 membered ring. More preferably, it is a ring.
Examples of the polyaryl group having 1 to 2 oxygen atoms and 1 to 3 nitrogen atoms as the heteroaryl group include a benzoxazolyl group and a benzooxadiazolyl group. It is preferable that it is a 9-10 membered ring.
Examples of the polyaryl group having 1 to 2 sulfur atoms and 1 to 3 nitrogen atoms as the heteroaryl group include a benzothiazolyl group and a benzothiadiazolyl group, and is a 7 to 12 membered ring. Preferably, it is a 9-10 membered ring.

The diamine only needs to have two amino groups, and the positional relationship between the two amino groups is not particularly limited. As the preferred diamine, in the monoalkylamine, monoarylamine or mono (heteroaryl) amine, one hydrogen atom other than the hydrogen atom constituting the amino group (—NH ₂ ) is substituted with an amino group. The thing can be illustrated.
The diamine preferably has 1 to 10 carbon atoms, and more preferable examples include ethylenediamine, 1,3-diaminopropane, and 1,4-diaminobutane.

  Examples of the secondary amine include dialkylamine, diarylamine, di (heteroaryl) amine and the like in which one or more hydrogen atoms may be substituted with a substituent.

The alkyl group that constitutes the dialkylamine is the same as the alkyl group that constitutes the monoalkylamine, and is a linear or branched alkyl group having 1 to 9 carbon atoms, or 3 to 7 carbon atoms. A cyclic alkyl group is preferred. Two alkyl groups in one molecule of dialkylamine may be the same as or different from each other.
Specific examples of preferable dialkylamine include N-methyl-n-hexylamine, diisobutylamine, and di (2-ethylhexyl) amine.

  The aryl group constituting the diarylamine is the same as the aryl group constituting the monoarylamine, and preferably has 6 to 10 carbon atoms. Two aryl groups in one molecule of diarylamine may be the same as or different from each other.

  The heteroaryl group constituting the di (heteroaryl) amine is the same as the heteroaryl group constituting the mono (heteroaryl) amine, and is preferably a 6-12 membered ring. Two heteroaryl groups in one molecule of di (heteroaryl) amine may be the same or different from each other.

  Examples of the tertiary amine include trialkylamine and dialkylmonoarylamine in which one or more hydrogen atoms may be substituted with a substituent.

The alkyl group constituting the trialkylamine is the same as the alkyl group constituting the monoalkylamine, and is a linear or branched alkyl group having 1 to 19 carbon atoms, or 3 to 7 carbon atoms. The cyclic alkyl group is preferably. Further, the three alkyl groups in one molecule of trialkylamine may be the same as or different from each other. That is, all three alkyl groups may be the same, all may be different, or only a part may be different.
Preferable examples of the trialkylamine include N, N-dimethyl-n-octadecylamine and N, N-dimethylcyclohexylamine.

The alkyl group constituting the dialkyl monoarylamine is the same as the alkyl group constituting the monoalkylamine, and is a linear or branched alkyl group having 1 to 6 carbon atoms, or 3 to 3 carbon atoms. 7 is a cyclic alkyl group. Two alkyl groups in one molecule of dialkyl monoarylamine may be the same or different from each other.
The aryl group constituting the dialkyl monoarylamine is the same as the aryl group constituting the monoarylamine, and preferably has 6 to 10 carbon atoms.

In the present invention, examples of the quaternary ammonium salt include halogenated tetraalkylammonium, in which one or more hydrogen atoms may be substituted with a substituent.
The alkyl group constituting the halogenated tetraalkylammonium is the same as the alkyl group constituting the monoalkylamine, and preferably has 1 to 19 carbon atoms. Further, the four alkyl groups in one molecule of the tetraalkylammonium halide may be the same as or different from each other. That is, all four alkyl groups may be the same, all may be different, or only a part may be different.
Examples of the halogen constituting the halogenated tetraalkylammonium include fluorine, chlorine, bromine and iodine.
Specific examples of the preferred tetraalkylammonium halide include dodecyltrimethylammonium bromide.

So far, the chain amine compound and the quaternary organic ammonium salt have been mainly described. However, in the amine compound and the quaternary ammonium salt, the nitrogen atom constituting the amine moiety or the ammonium salt moiety is a ring skeleton structure ( A heterocyclic compound which is a part of a heterocyclic skeleton structure) may be used. That is, the amine compound may be a cyclic amine, and the quaternary ammonium salt may be a cyclic ammonium salt. At this time, the ring (ring containing the nitrogen atom constituting the amine moiety or ammonium salt moiety) structure may be either monocyclic or polycyclic, and the number of ring members (number of atoms constituting the ring skeleton) is also particularly limited. Any of an aliphatic ring and an aromatic ring may be sufficient.
If it is a cyclic amine, a pyridine can be illustrated as a preferable thing.

  In the primary amine, secondary amine, tertiary amine and quaternary ammonium salt, the “hydrogen atom optionally substituted with a substituent” means a nitrogen atom constituting an amine moiety or an ammonium salt moiety. A hydrogen atom other than a hydrogen atom bonded to. The number of substituents at this time is not particularly limited, and may be one or two or more, and all of the hydrogen atoms may be substituted with a substituent. When the number of substituents is plural, the plural substituents may be the same as or different from each other. That is, the plurality of substituents may all be the same, may all be different, or only some may be different. Further, the position of the substituent is not particularly limited.

Examples of the substituent in the amine compound and the quaternary ammonium salt include an alkyl group, an aryl group, a halogen atom, a cyano group, a nitro group, a hydroxyl group, and a trifluoromethyl group (—CF ₃ ). Here, examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

When the alkyl group constituting the monoalkylamine has a substituent, the alkyl group has an aryl group as a substituent, a linear or branched alkyl group having 1 to 9 carbon atoms, or a substituent Preferably, a cyclic alkyl group having 3 to 7 carbon atoms having an alkyl group having 1 to 5 carbon atoms is preferable, and specific examples of monoalkylamine having such a substituent include 2-phenylethylamine , Benzylamine, and 2,3-dimethylcyclohexylamine.
In addition, the aryl group and the alkyl group which are substituents may further have one or more hydrogen atoms substituted with halogen atoms, and as monoalkylamines having such substituents substituted with halogen atoms, And 2-bromobenzylamine. Here, examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

  When the aryl group constituting the monoarylamine has a substituent, the aryl group is preferably an aryl group having a halogen atom as a substituent and having 6 to 10 carbon atoms, and monoaryl having such a substituent. Specific examples of the amine include bromophenylamine. Here, examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

  When the alkyl group constituting the dialkylamine has a substituent, the alkyl group is preferably a linear or branched alkyl group having 1 to 9 carbon atoms and having a hydroxyl group or an aryl group as a substituent, Specific examples of the dialkylamine having such a substituent include diethanolamine and N-methylbenzylamine.

The amine compound is n-propylamine, n-butylamine, n-hexylamine, n-octylamine, n-dodecylamine, n-octadecylamine, isobutylamine, sec-butylamine, tert-butylamine, 3-aminopentane, 3-methylbutylamine, 2-heptylamine, 2-aminooctane, 2-ethylhexylamine, 2-phenylethylamine, ethylenediamine, 1,3-diaminopropane, 1,4-diaminobutane, N-methyl-n-hexylamine, Diisobutylamine, N-methylbenzylamine, di (2-ethylhexyl) amine, 1,2-dimethyl-n-propylamine, N, N-dimethyl-n-octadecylamine or N, N-dimethylcyclohexylamine. It is preferable.
Among these amine compounds, 2-ethylhexylamine is excellent in compatibility with the silver carboxylate, particularly suitable for increasing the concentration of the silver ink composition, and further for reducing the surface roughness of the conductive layer 13. Particularly suitable.

(Ammonium salts derived from amine compounds)
In the present invention, the ammonium salt derived from the amine compound is an ammonium salt obtained by reacting the amine compound with an acid, and the acid may be an inorganic acid such as hydrochloric acid, sulfuric acid or nitric acid, or an organic acid such as acetic acid. However, the type of acid is not particularly limited.
Examples of the ammonium salt derived from the amine compound include, but are not limited to, n-propylamine hydrochloride, N-methyl-n-hexylamine hydrochloride, N, N-dimethyl-n-octadecylamine hydrochloride and the like. .

(Ammonium salt derived from ammonia)
In the present invention, the ammonium salt derived from ammonia is an ammonium salt formed by reacting ammonia with an acid, and examples of the acid include the same ones as in the case of the ammonium salt derived from the amine compound.
Examples of the ammonium salt derived from ammonia include ammonium chloride, but are not limited thereto.

In the present invention, the amine compound, the quaternary ammonium salt, the ammonium salt derived from the amine compound and the ammonium salt derived from ammonia may be used singly or in combination of two or more. . When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.
And as said nitrogen-containing compound, you may use individually by 1 type selected from the group which consists of said amine compound, quaternary ammonium salt, ammonium salt derived from an amine compound, and ammonium salt derived from ammonia, More than one species may be used in combination. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

  In the silver ink composition, the compounding amount of the nitrogen-containing compound is preferably 0.3 to 15 mol, more preferably 0.3 to 5 mol, per mol of the metal silver forming material. preferable. When the blending amount of the nitrogen-containing compound is within such a range, the silver ink composition is further improved in stability and the quality of the conductor (metal silver) is further improved. Furthermore, the conductor can be formed more stably without performing heat treatment at a high temperature.

[Reducing agent]
The silver ink composition preferably contains a reducing agent in addition to the metal silver forming material. By blending a reducing agent, the silver ink composition can more easily form metallic silver. For example, a conductor (metal silver) having sufficient conductivity can be formed even by heat treatment at a low temperature.

The reducing agent is one or more reducing compounds selected from the group consisting of oxalic acid, hydrazine and a compound represented by the following general formula (5) (hereinafter sometimes abbreviated as “compound (5)”). (Hereinafter, sometimes simply abbreviated as “reducing compound”).
HC (= O) -R ²¹ (5)
(In the formula, R ²¹ represents an alkyl group having 20 or less carbon atoms, an alkoxy group, an N, N-dialkylamino group, a hydroxyl group, or an amino group.)

(Reducing compounds)
The reducing compound is one or more selected from the group consisting of oxalic acid (HOOC-COOH), hydrazine (H ₂ N—NH ₂ ) and the compound represented by the general formula (5) (compound (5)). belongs to. That is, the reducing compound to be blended may be only one kind, or two or more kinds. When two or more kinds are used in combination, the combination and ratio can be arbitrarily adjusted.

The alkyl group having 20 or less carbon atoms in R ²¹ has 1 to 20 carbon atoms, and may be linear, branched or cyclic, and is the same as the alkyl group in R of the general formula (1) The thing can be illustrated.

The alkoxy group having 20 or less carbon atoms in R ²¹ has 1 to 20 carbon atoms, and examples thereof include monovalent groups in which the alkyl group in R ²¹ is bonded to an oxygen atom.

The N, N-dialkylamino group having 20 or less carbon atoms in R ²¹ has 2 to 20 carbon atoms, and the two alkyl groups bonded to the nitrogen atom may be the same as or different from each other, Each alkyl group has 1 to 19 carbon atoms. However, the total value of the carbon number of these two alkyl groups is 2-20.
The alkyl group bonded to the nitrogen atom may be linear, branched or cyclic, respectively, and the alkyl in R of the general formula (1) except that it has 1 to 19 carbon atoms. The thing similar to group can be illustrated.

As the reducing compound, hydrazine may be a monohydrate (H ₂ N—NH ₂ .H ₂ O).

Preferred examples of the reducing compound include formic acid (HC (═O) —OH); methyl formate (HC (═O) —OCH ₃ ), ethyl formate (HC (═O) —OCH). Formic acid esters such as ₂ CH ₃ ) and butyl formate (HC (═O) —O (CH ₂ ) ₃ CH ₃ ); propanal (HC (═O) —CH ₂ CH ₃ ), butanal (H Aldehydes such as —C (═O) — (CH ₂ ) ₂ CH ₃ ) and hexanal (HC— (O) — (CH ₂ ) ₄ CH ₃ ); formamide (HC— (O) —NH ₂ ), N, N-dimethylformamide (HC (═O) —N (CH ₃ ) ₂ ) and other formamides (groups represented by the formula “HC (═O) —N (—) —”) And oxalic acid.

  In the silver ink composition, the compounding amount of the reducing agent is preferably 0.04 to 3.5 mol, and preferably 0.06 to 2.5 mol per 1 mol of the metal silver forming material. Is more preferable. When the blending amount of the reducing agent is within such a range, the silver ink composition can form a conductor (metal silver) more easily and more stably.

[alcohol]
The silver ink composition may further contain an alcohol in addition to the metal silver forming material.

  The alcohol is preferably an acetylene alcohol represented by the following general formula (2) (hereinafter sometimes abbreviated as “acetylene alcohol (2)”).

（式中、Ｒ’及びＲ’’は、それぞれ独立に炭素数１〜２０のアルキル基、又は１個以上の水素原子が置換基で置換されていてもよいフェニル基である。）

(In the formula, R ′ and R ″ are each independently an alkyl group having 1 to 20 carbon atoms or a phenyl group in which one or more hydrogen atoms may be substituted with a substituent.)

(Acetylene alcohol (2))
The acetylene alcohol (2) is represented by the general formula (2).
In the formula, R ′ and R ″ are each independently an alkyl group having 1 to 20 carbon atoms, or a phenyl group in which one or more hydrogen atoms may be substituted with a substituent.
The alkyl group having 1 to 20 carbon atoms in R ′ and R ″ may be linear, branched or cyclic, and when it is cyclic, it may be monocyclic or polycyclic. Examples of the alkyl group in R ′ and R ″ include the same alkyl groups as in R.

  Examples of the substituent in which the hydrogen atom of the phenyl group in R ′ and R ″ may be substituted include a saturated or unsaturated monovalent aliphatic hydrocarbon group having 1 to 16 carbon atoms, the aliphatic carbonization Examples thereof include a monovalent group formed by bonding a hydrogen group to an oxygen atom, a fluorine atom, a chlorine atom, a bromine atom, a hydroxyl group, a cyano group, a phenoxy group, and the like, and the hydrogen atom of the phenyl group in R may be substituted. This is the same as the substituent. And the number and position of a substituent are not specifically limited, When there are two or more substituents, these several substituents may mutually be same or different.

  R ′ and R ″ are preferably an alkyl group having 1 to 20 carbon atoms, and more preferably a linear or branched alkyl group having 1 to 10 carbon atoms.

  Examples of preferable acetylene alcohol (2) include 3,5-dimethyl-1-hexyn-3-ol, 3-methyl-1-butyn-3-ol, and 3-methyl-1-pentyn-3-ol.

  When acetylene alcohol (2) is used, the amount of acetylene alcohol (2) in the silver ink composition is preferably 0.03 to 0.7 mole per mole of the metal silver forming material. It is more preferable that it is 0.04-0.3 mol. When the blending amount of acetylene alcohol (2) is within such a range, the stability of the silver ink composition is further improved.

  The said alcohol may be used individually by 1 type, and may use 2 or more types together. When two or more kinds are used in combination, the combination and ratio can be arbitrarily adjusted.

[Other ingredients]
The silver ink composition may contain other components other than the metallic silver forming material, nitrogen-containing compound, reducing agent, and alcohol.
The other components in the silver ink composition can be arbitrarily selected according to the purpose, and are not particularly limited. Preferred examples thereof include solvents other than alcohol, and can be arbitrarily selected according to the type and amount of compounding components. it can.
One of these other components in the silver ink composition may be used alone, or two or more thereof may be used in combination. When two or more kinds are used in combination, the combination and ratio can be arbitrarily adjusted.

  In the silver ink composition, the ratio of the blending amount of the other components to the total amount of the blending components is preferably 10% by mass or less, more preferably 5% by mass or less, and 0 mass, ie other components. Even if it is not added, the silver ink composition exhibits its effect sufficiently.

  In the silver ink composition, all the compounding components may be dissolved, or some or all of the components may be dispersed without dissolving, but it is preferable that all the compounding components are dissolved. The undissolved component is preferably dispersed uniformly.

[Method for producing silver ink composition]
The silver ink composition is obtained by blending components other than the metallic silver forming material and the metallic silver forming material. After the blending of each component, the resulting product may be used as it is as a silver ink composition, or a product obtained by performing a known purification operation as necessary may be used as a silver ink composition. In the present invention, in particular, when β-ketocarboxylate (1) is used as the material for forming the metal silver, impurities that impede conductivity are not generated at the time of blending the above components, or such Since the generation amount of impurities can be suppressed to a very small amount, a conductor (metal silver) having sufficient conductivity can be obtained even if a silver ink composition that has not been subjected to a purification operation is used.

At the time of blending each component, all the components may be added and then mixed, or some components may be mixed while being added sequentially, or all components may be mixed while being added sequentially. Good. However, in this invention, it is preferable to mix | blend the said reducing agent by dripping, and exists in the tendency which can further reduce the surface roughness of metal silver by suppressing the fluctuation | variation of dripping speed | rate.
The mixing method is not particularly limited, a method of mixing by rotating a stirrer or a stirring blade; a method of mixing using a mixer, a three-roller, a kneader, a bead mill or the like; a method of mixing by adding ultrasonic waves, etc. What is necessary is just to select suitably from a well-known method.
In the silver ink composition, when the undissolved component is uniformly dispersed, for example, a method of dispersing using the above-described three rolls, kneader, bead mill or the like is preferably applied.

The temperature at the time of blending is not particularly limited as long as each blending component does not deteriorate, but is preferably −5 to 60 ° C. And the temperature at the time of mixing | blending is good to adjust suitably so that the mixture obtained by mix | blending may become the viscosity which is easy to stir according to the kind and quantity of a mixing | blending component.
Further, the blending time is not particularly limited as long as each blending component does not deteriorate, but it is preferably 10 minutes to 36 hours.

[carbon dioxide]
The silver ink composition may be further supplied with carbon dioxide. Such a silver ink composition has a high viscosity. For example, a flexographic printing method, a screen printing method, a gravure printing method, a gravure offset printing method, a pad printing method, etc. Suitable for application.

Carbon dioxide may be supplied at any time during the production of the silver ink composition.
In the present invention, for example, carbon dioxide is supplied to the first mixture in which the metal silver forming material and the nitrogen-containing compound are blended to form a second mixture, and if necessary, the second mixture It is preferable that a silver ink composition is produced by further blending the reducing agent with the mixture. Moreover, when mix | blending the said alcohol or another component, these can be mix | blended at the time of manufacture of any one or both of a 1st mixture and a 2nd mixture, and can be arbitrarily selected according to the objective.

  The first mixture can be produced by the same method as the above silver ink composition except that the blending components are different.

  The first mixture may have all of the compounding components dissolved, or may be in a state of being dispersed without dissolving some of the components, but preferably all of the compounding components are dissolved and dissolved. It is preferable that the components not dispersed are uniformly dispersed.

  Although the compounding temperature at the time of manufacture of a 1st mixture is not specifically limited unless each compounding component deteriorates, it is preferable that it is -5-30 degreeC. Moreover, what is necessary is just to adjust a compounding time suitably according to the kind of compounding component, and the temperature at the time of a compounding, For example, it is preferable that it is 0.5 to 12 hours.

Carbon dioxide (CO ₂ ) supplied to the first mixture may be either gaseous or solid (dry ice), or both gaseous and solid. By supplying carbon dioxide, it is estimated that this carbon dioxide dissolves in the first mixture and acts on the components in the first mixture, thereby increasing the viscosity of the obtained second mixture.

  Carbon dioxide gas may be supplied by various known methods of blowing gas into the liquid, and a suitable supply method may be selected as appropriate. For example, a method in which one end of a pipe is immersed in the first mixture, the other end is connected to a carbon dioxide gas supply source, and the carbon dioxide gas is supplied to the first mixture through the pipe. At this time, the carbon dioxide gas may be supplied directly from the end of the pipe. For example, a plurality of voids that can serve as gas flow paths, such as a porous one, are provided to diffuse the introduced gas. A gas diffusion member that can be discharged as minute bubbles may be connected to the end of the pipe, and the carbon dioxide gas may be supplied through the gas diffusion member. Moreover, you may supply a carbon dioxide gas, stirring the 1st mixture by the method similar to the time of manufacture of a 1st mixture. By doing in this way, carbon dioxide can be supplied efficiently.

  The supply amount of the carbon dioxide gas is not particularly limited as long as it is appropriately adjusted according to the amount of the first mixture at the supply destination and the viscosity of the target silver ink composition or the second mixture. For example, in order to obtain about 100 to 1000 g of a silver ink composition having a viscosity at 20 to 25 ° C. of 5 Pa · s or more, it is preferable to supply 100 L or more of carbon dioxide gas, and more preferably 200 L or more. In addition, although the viscosity at 20-25 degreeC of a silver ink composition was demonstrated here, the temperature at the time of use of a silver ink composition is not limited to 20-25 degreeC, It can select arbitrarily. In the present specification, “viscosity” means a value measured using an ultrasonic vibration viscometer unless otherwise specified.

The flow rate of carbon dioxide gas may be appropriately adjusted in consideration of the required supply amount of carbon dioxide gas, but is preferably 0.5 mL / min or more per 1 g of the first mixture, and is 1 mL / min or more. It is more preferable that The upper limit value of the flow rate is not particularly limited, but is preferably 40 mL / min per 1 g of the mixture in consideration of handling properties and the like.
The carbon dioxide gas supply time may be appropriately adjusted in consideration of the required supply amount and flow rate of carbon dioxide gas.

  The temperature of the first mixture at the time of supplying carbon dioxide gas is preferably 5 to 70 ° C, more preferably 7 to 60 ° C, and particularly preferably 10 to 50 ° C. When the temperature is equal to or higher than the lower limit value, carbon dioxide can be supplied more efficiently, and when the temperature is equal to or lower than the upper limit value, a silver ink composition having better quality with fewer impurities can be obtained.

  The flow rate and supply time of the carbon dioxide gas, and the temperature at the time of supplying the carbon dioxide gas may be adjusted to a suitable range while considering each value. For example, even if the temperature is set lower, the carbon dioxide gas flow rate is set higher, the carbon dioxide gas supply time is set longer, or both are performed efficiently. Can supply carbon. Moreover, even if the flow rate of carbon dioxide gas is set to a small value, the carbon dioxide gas can be efficiently produced by increasing the temperature, setting the carbon dioxide gas supply time longer, or both. Can supply. That is, a silver ink of good quality can be obtained by flexibly combining the numerical values in the above numerical range exemplified as the flow rate of carbon dioxide gas and the temperature at the time of carbon dioxide gas supply while considering the supply time of carbon dioxide gas. A composition is obtained efficiently.

The carbon dioxide gas is preferably supplied while stirring the first mixture. By doing in this way, the supplied carbon dioxide gas diffuses more uniformly in the first mixture, and carbon dioxide can be supplied more efficiently.
The stirring method at this time may be the same as in the case of the mixing method at the time of producing the above silver ink composition not using carbon dioxide.

The supply of dry ice (solid carbon dioxide) may be performed by adding dry ice to the first mixture. The total amount of dry ice may be added all at once, or may be added stepwise (continuously across a time zone during which no addition is performed).
What is necessary is just to adjust the usage-amount of dry ice in consideration of the supply amount of said carbon dioxide gas.
During and after the addition of dry ice, the first mixture is preferably stirred. For example, the first mixture is preferably stirred in the same manner as in the production of the above silver ink composition without using carbon dioxide. By doing in this way, carbon dioxide can be supplied efficiently.
The temperature at the time of stirring may be the same as that at the time of supplying carbon dioxide gas. Moreover, what is necessary is just to adjust stirring time suitably according to stirring temperature.

  The viscosity of the second mixture may be appropriately adjusted depending on the purpose, such as a silver ink composition or a method of handling the second mixture, and is not particularly limited. For example, when the silver ink composition is applied to a printing method using a high viscosity ink such as a screen printing method or a flexographic printing method, the viscosity of the second mixture at 20 to 25 ° C. is 3 Pa · s or more. It is preferable. In addition, although the viscosity at 20-25 degreeC of the 2nd mixture was demonstrated here, the temperature at the time of use of a 2nd mixture is not limited to 20-25 degreeC, It can select arbitrarily.

If necessary, the second mixture may be further blended with one or more selected from the group consisting of the reducing agent, alcohol and other components to form a silver ink composition.
The silver ink composition at this time can be manufactured by the same method as the above silver ink composition not using carbon dioxide except that the blending components are different. The obtained silver ink composition may have all of the compounding components dissolved therein or may be in a state where some of the components are dispersed without dissolving, but all of the compounding components are dissolved. Preferably, the undissolved component is preferably dispersed uniformly.

The temperature at the time of blending the reducing agent is not particularly limited as long as each blended component does not deteriorate, but is preferably −5 to 60 ° C. And the temperature at the time of mixing | blending is good to adjust suitably so that the mixture obtained by mix | blending may become the viscosity which is easy to stir according to the kind and quantity of a mixing | blending component.
Moreover, what is necessary is just to adjust a compounding time suitably according to the kind of compounding component, and the temperature at the time of a compounding, For example, it is preferable that it is 0.5 to 12 hours.

  As described above, the other components may be blended during the production of either the first mixture or the second mixture, or may be blended during the production of both. That is, in the process of producing the silver ink composition through the first mixture and the second mixture, the ratio of the blended amount of the other components to the total amount of blended components other than carbon dioxide ([other components (mass)] / [Formation material of metallic silver, nitrogen-containing compound, reducing agent, alcohol, and other components (mass)] × 100) is preferably 10% by mass or less, and more preferably 5% by mass or less. , 0 mass, that is, the silver ink composition exhibits its effect sufficiently even if other components are not blended.

  The silver ink composition to which carbon dioxide is supplied is, for example, a viscosity at 20 to 25 ° C. when the silver ink composition is applied to a printing method using a high viscosity ink such as a screen printing method or a flexographic printing method. Is preferably 1 Pa · s or more.

  For example, when a reducing agent is blended, the resulting blend (silver ink composition) tends to generate heat relatively easily. And when the temperature at the time of mixing | blending of a reducing agent is high, since this compounding will be in the state similar to the time of the heat processing of the silver ink composition mentioned later, by the decomposition | disassembly acceleration | stimulation effect | action of the said metal silver formation material by a reducing agent It is presumed that the formation of metal silver may be started in at least a part of the metal silver forming material. A silver ink composition containing such metallic silver may be able to form a conductor by performing post-treatment under milder conditions than the silver ink composition not containing metallic silver at the time of forming the conductor. Further, even when the amount of the reducing agent is sufficiently large, the conductor may be formed by performing the post-treatment under the same mild conditions. In this way, by adopting conditions that promote the decomposition of the metal silver forming material, the conductor can be used as a post-treatment, either by a heat treatment at a lower temperature or by a drying treatment at normal temperature without performing the heat treatment. Can be formed. Moreover, the silver ink composition containing such metal silver can be handled in the same manner as the silver ink composition not containing metal silver, and the handleability is not particularly inferior.

  The second mixture in the present invention has a higher viscosity than usual due to the supply of carbon dioxide as described above. On the other hand, when the reducing agent is blended into the second mixture, depending on the type of the second mixture or the reducing agent, formation of metallic silver is started in at least part of the metallic silver forming material as described above. Metallic silver may precipitate. Here, when the viscosity of the second mixture is high, the aggregation of the precipitated metallic silver is suppressed, and the dispersibility of the metallic silver in the obtained silver ink composition is improved. A conductor obtained by forming metallic silver by a method described later using such a silver ink composition is obtained by blending a reducing agent in a mixture having a low viscosity, that is, carbon dioxide is not supplied. In addition, it has higher electrical conductivity (lower volume resistivity), lower surface roughness, and more favorable characteristics than a conductor using a silver ink composition.

  In the present invention, it is also preferable to produce a silver ink composition by supplying carbon dioxide to a mixture containing the metallic silver forming material, alcohol and nitrogen-containing compound. In this case, a method similar to the above can be adopted as a method for supplying carbon dioxide.

A silver ink composition can be made to adhere on a base material by well-known methods, such as a printing method, the apply | coating method, and the immersion method, for example.
Examples of the printing method include screen printing method, flexographic printing method, offset printing method, dip printing method, ink jet printing method, dispenser printing method, jet dispenser printing method, gravure printing method, gravure offset printing method, pad printing. The law etc. can be illustrated.
Examples of the coating method include spin coaters, air knife coaters, curtain coaters, die coaters, blade coaters, roll coaters, gate roll coaters, bar coaters, rod coaters, gravure coaters, and other methods such as wire bars. It can be illustrated.

  In the conductive layer forming step, the thickness of the conductive layer 13 is adjusted by adjusting the amount of the silver ink composition to be deposited on the substrate 11 or the amount of the metallic silver forming material in the silver ink composition. it can.

  When the silver ink composition deposited on the substrate 11 is dried, it may be performed by a known method, for example, under normal pressure, reduced pressure, or blowing conditions, It may be performed in any of an inert gas atmosphere. Also, the drying temperature is not particularly limited, and may be either heat drying or room temperature drying. As a preferable drying method when the heat treatment is unnecessary, a method of drying in the atmosphere at 18 to 30 ° C. can be exemplified.

  When the silver ink composition deposited on the substrate 11 is heated (baked), the conditions may be adjusted as appropriate according to the type of compounding component of the silver ink composition. Usually, it is preferable that heating temperature is 60-370 degreeC, and it is more preferable that it is 70-280 degreeC. Although what is necessary is just to adjust a heating time according to heating temperature, Usually, it is preferable that it is 0.2 to 12 hours, and it is more preferable that it is 0.4 to 10 hours. Among the silver metal forming materials, the silver carboxylate, particularly β-ketocarboxylate silver (1) is different from metal silver forming materials such as silver oxide, for example, using a reducing agent known in the art. Even if not, it decomposes at low temperature. Reflecting such decomposition temperature, the silver ink composition can form metallic silver at an extremely lower temperature than the conventional one as described above.

  When the silver ink composition is attached to a substrate having low heat resistance and is heated (baked), the heating temperature is preferably less than 130 ° C, more preferably 125 ° C or less, and 120 ° C or less. It is particularly preferred that

  The method for heat treatment of the silver ink composition is not particularly limited, and for example, heating by an electric furnace, heating by a thermal head, heating by far infrared irradiation, heating by blowing a hot gas, or the like can be performed. Further, the heat treatment of the silver ink composition may be performed in the air, in an inert gas atmosphere, or may be performed under humidified conditions. And you may carry out under any of normal pressure, pressure reduction, and pressurization.

  In the present specification, “humidification” means that the humidity is artificially increased unless otherwise specified, and preferably the relative humidity is 5% or more. At the time of heat treatment, since the humidity in the treatment environment becomes extremely low due to the high treatment temperature, it can be said that the relative humidity of 5% is clearly artificially increased.

  When the heat treatment of the silver ink composition is performed under humidified conditions, it is preferably performed in an atmosphere having a relative humidity of 40% or more, more preferably in an atmosphere having a relative humidity of 60% or more, and a relative humidity of 80%. It is particularly preferable to perform in the above atmosphere, and may be performed by spraying high-pressure steam heated to 100 ° C. or higher. By performing heat treatment under humidification conditions in this manner, a conductor having a low resistance value (excellent conductivity) can be formed in a short time.

The heat treatment of the silver ink composition may be performed in two stages. For example, in the first stage heat treatment, a method of mainly drying the silver ink composition instead of forming the conductor, and performing the formation of the conductor to the end in the second stage heat treatment can be exemplified.
In the first-stage heat treatment, the heating temperature may be appropriately adjusted according to the type of compounding component of the silver ink composition, but is preferably 50 to 110 ° C, more preferably 70 to 90 ° C. preferable. Moreover, what is necessary is just to adjust a heating time according to heating temperature, Usually, it is preferable that it is 5 second-12 hours, and it is more preferable that it is 30 second-2 hours.
In the second-stage heat treatment, the heating temperature may be appropriately adjusted according to the type of compounding component of the silver ink composition so that the conductor is satisfactorily formed, but it should be 60 to 280 ° C. Preferably, it is 70-260 degreeC. Moreover, what is necessary is just to adjust a heating time according to heating temperature, Usually, it is preferable that it is 1 minute-12 hours, and it is more preferable that it is 1 minute-10 hours.
When the silver ink composition is attached to a receiving layer on a substrate having low heat resistance and subjected to heating (firing) treatment, the heating temperature in the first and second stage heat treatment is less than 130 ° C. It is preferably 125 ° C. or lower, more preferably 120 ° C. or lower.

When heat treatment under humidified conditions is employed, the heat treatment of the silver ink composition is not the formation of the conductor as described above but the formation of the silver ink composition under non-humidified conditions in the first stage heat treatment. It is particularly preferable to perform the drying mainly, and to perform the second-stage heat treatment by a two-stage method in which the conductor is formed to the end as described above under humidified conditions.
In the present specification, “non-humidification” means that the above “humidification” is not performed, that is, the humidity is not artificially increased, and preferably the relative humidity is less than 5%. .

When performing the above heat treatment by a two-stage method, the heating temperature during the heat treatment under the first non-humidifying condition is preferably 50 to 110 ° C, more preferably 70 to 90 ° C. preferable. The heating time is preferably 5 seconds to 3 hours, more preferably 30 seconds to 2 hours, and particularly preferably 30 seconds to 1 hour.
When performing the above-mentioned heat treatment by a two-stage method, the heating temperature during the heat treatment under the second-stage humidification condition is preferably 60 to 280 ° C, more preferably 70 to 260 ° C. . The heating time is preferably 1 minute to 2 hours, more preferably 1 minute to 1 hour, and particularly preferably 1 minute to 30 minutes.
When the silver ink composition is attached to a receiving layer on a substrate having low heat resistance and heated (baked), the heat treatment under the first stage non-humidifying condition and the second stage humidifying condition are performed. The heating temperature in the heat treatment at is preferably less than 130 ° C, more preferably 125 ° C or less, and particularly preferably 120 ° C or less.

  When producing a laminate according to the present invention in which other layers other than the receiving layer 12 and the conductive layer 13 are provided on the base material 11, in the production method described above, the other layers are provided at a predetermined timing. A step of forming the layer may be added as appropriate.

<< Electronic equipment, transparent conductive film >>
The laminate according to the present invention is suitable for constituting various electronic devices, transparent conductive films and the like.
For example, the electronic device can be configured to use the laminate and include the base material as a casing (exterior material), and at least a part of the casing (exterior material) is configured with the base material in the laminate. Except for this point, the configuration can be the same as that of a known electronic device. For example, a planar or curved surface portion of an exterior material in a communication device such as a mobile phone is used as the base material, and a thin line made of the conductive layer is formed on the exterior material (base material), and the thin line is used as a circuit. The laminate can be used as a circuit board. For example, a cellular phone can be configured by combining a voice input unit, a voice output unit, an operation switch, a display unit, and the like in addition to the laminate. Further, by using the patterned conductive layer as an antenna, the laminate can be used as an antenna structure, and the configuration is the same as that of a known data transmitting / receiving body except that the antenna structure is used. Thus, a new data receiving / transmitting body can be obtained. For example, in the laminate, an IC chip electrically connected to a conductor is provided on a base material to form an antenna portion, whereby a non-contact type data receiving / transmitting body can be configured.

Further, the transparent conductive film can be configured to use the laminate and include the conductive layer as ultrafine wiring or ultrathin wiring, except that the conductive layer is provided as ultrafine wiring or ultrathin wiring. It can be set as the structure similar to this transparent conductive film. For example, in addition to the laminate, a touch panel or an optical display can be configured by combining with a transparent substrate or the like.
The line width of the ultrafine wiring is preferably 1 to 20 μm, more preferably 1.3 to 15 μm, and particularly preferably 1.5 to 13 μm.
In addition, the cross-sectional shape of the ultrafine wiring is preferably a semi-elliptical shape in which approximately half the region in the minor axis direction of the ellipse is cut off.
On the other hand, the thickness of the ultra-thin wiring is preferably 5 nm to 10 μm, more preferably 7 nm to 5 μm, and particularly preferably 10 nm to 1 μm.
The cross-sectional shape of the ultrathin wiring is the same as the cross-sectional shape of the ultrafine wiring.
In the transparent conductive film, the conductive layer preferably satisfies at least one of such a line width and thickness. If the conductive layer has such a line width or thickness, it is difficult to recognize the presence by visual observation, which is preferable as the transparent conductive film.

In the laminate, the conductive layer can be formed at a low temperature, and a wide range of materials such as a base material can be selected. Thus, the degree of freedom in design is greatly improved, and electronic devices, transparent conductive films, etc. Can be made more rational.
The above electronic devices, transparent conductive films, and the like can maintain high performance over a long period of time.

  Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples.

[Example 1]
<Manufacture of laminates>
(Manufacture of silver ink composition)
Add 2-methyl acetoacetate silver to 2-ethylhexylamine (0.4 times molar amount with respect to 2-methylacetoacetate silver described later) in a beaker so that the liquid temperature is 50 ° C. or less. The mixture was stirred for 15 minutes to obtain a liquid material. To this liquid, formic acid (0.7-fold molar amount with respect to silver 2-methylacetoacetate) was added dropwise over 30 minutes using a syringe pump so that the temperature of the reaction solution was 50 ° C. or lower. After the formic acid was dropped, the reaction solution was further stirred at 25 ° C. for 1 hour to obtain a silver ink composition. Table 1 shows the types and blending ratios of each blending component. In Table 1, “nitrogen-containing compound (molar ratio)” means the compounding amount (number of moles) of nitrogen-containing compound per mol of compounding material of the metallic silver ([number of moles of nitrogen-containing compound] / [metal The number of moles of silver forming material]). Similarly, the “reducing agent (molar ratio)” is the amount (mole number) of the reducing agent per mole of the metal silver forming material ([mole number of reducing agent] / [mole of metal silver forming material). Number]).

(Manufacture of laminates)
On one main surface (surface) of a base material (thickness: 1.5 mm) made of polyamide containing 60% by mass of glass, a spin coating method (3000 rpm for 5 seconds and then 6000 rpm for 5 seconds) is used in the present invention. “JELCON AC-3G” manufactured by Jujo Chemical Co., Ltd. was applied as a receiving layer composition, and dried at 200 ° C. for 10 minutes to form a receiving layer having a thickness of 7 μm on the entire surface of the substrate. “JELCON AC-3G” contains, as a resin component, a polyester having a nitrogen atom, a hydroxyl group, and a benzene ring skeleton and having a weight average molecular weight of 43,000. Moreover, what formed the said polyester into a film has a glass transition point (Tg) of 70 degreeC.
The base material was obtained by injection molding polyamide resin pellets (“Lenny (registered trademark)” manufactured by Mitsubishi Engineering Plastics) at 270 to 300 ° C. containing 60% by mass of glass.

Subsequently, printing was performed with the silver ink composition obtained above using an air-type dispenser under conditions of a discharge pressure of 100 kPa and a printing surface gap of 0.17 mm to form a printing pattern.
Next, the substrate printed in an oven is dried at 80 ° C. for 30 minutes, and further, this substrate is placed in a steam atmosphere at 200 ° C. for 10 minutes and heated (baked) to obtain a thickness of 25 μm, A silver layer having a width of 400 μm was formed on the surface of the receiving layer to obtain a laminate.
In the obtained laminate, the surface roughness of the silver layer was measured according to JIS B0601: 2001 (ISO 4287: 1997) using a laser microscope (“VK-X100” manufactured by Keyence Corporation). It was.

<Evaluation of laminate>
(Measurement of volume resistivity of conductive layer)
With respect to the formed silver layer, the line resistance value R (Ω), the cross-sectional area A (cm ² ), and the line length L (cm) are measured, and the volume resistance of the silver layer is determined by the equation “ρ = R × A / L”. The rate ρ (μΩ · cm) was calculated. The line resistance R was measured by a two-terminal method using a digital multimeter (“7352” manufactured by ADC), and the cross-sectional area A was measured using a laser microscope (“VK-X100” manufactured by Keyence). . The results are shown in Table 2.

(Evaluation of adhesion)
About the laminated body obtained above, the adhesiveness of a silver layer and a base material was evaluated based on JISK5600-5-6. The results are shown in Table 2.

<Manufacture and evaluation of laminate>
[Example 2]
A laminate was produced and evaluated in the same manner as in Example 1 except that a glass substrate (thickness: 1.5 mm) was used instead of the substrate composed of polyamide containing 60% by mass of glass. The results are shown in Table 2.

[Comparative Example 1]
A laminated body was produced in the same manner as in Example 1 except that “AE-421H” manufactured by Ajinomoto Fine Techno Co. was used instead of “JELCON AC-3G” manufactured by Jujo Chemical Co., Ltd. as the composition for the receiving layer. evaluated. "AE-421H" is not a polyester as a resin component, but contains an epoxy resin having no nitrogen atom and having a hydroxyl group and a benzene ring skeleton. The epoxy resin has a glass transition point (Tg) of 24 ° C. The results are shown in Table 2.

[Comparative Example 2]
A laminate was produced in the same manner as in Example 1, except that “AE-780” manufactured by Ajinomoto Fine Techno Co. was used instead of “JELCON AC-3G” manufactured by Jujo Chemical Co., Ltd. evaluated. "AE-780" is not a polyester as a resin component, but contains an epoxy resin having no nitrogen atom and having a hydroxyl group and a benzene ring skeleton. The epoxy resin has a glass transition point (Tg) of 100 ° C. The results are shown in Table 2.

  As is clear from the above results, in the laminates of Examples 1 and 2, the receiving layer contains a resin having a nitrogen atom and a hydroxyl group, the adhesion between the base material and the receiving layer, and the receiving layer and the silver layer (conductive layer). All of the adhesiveness between the layers satisfied the classification 0, and the adhesiveness between the silver layer and the substrate was excellent. Moreover, the silver layer in the laminated body of these Examples had low volume resistivity, and was excellent in electroconductivity.

  On the other hand, in the laminates of Comparative Examples 1 and 2 including a resin having a hydroxyl group and no nitrogen atom, the adhesion between the receptor layer and the silver layer is classified as 5, and the receptor layer and the silver layer Peeling occurred at the interface, and the adhesion between the silver layer and the substrate was poor. Moreover, the laminated bodies of Comparative Examples 1 and 2 had higher volume resistivity than the laminated bodies of Examples 1 and 2.

  In addition to the above examples and comparative examples, an attempt was made on a glass substrate to form a receiving layer containing a urethane acrylate resin having a nitrogen atom and not having a hydroxyl group and a benzene ring skeleton. Could not be formed. In addition, formation of a receiving layer containing a polyvinyl butyral resin having a hydroxyl group and having no nitrogen atom and benzene ring skeleton was attempted on a glass substrate, but formed more stably than the receiving layer containing the urethane acrylate resin. Although it was possible, the stability was low. From these results, when the receiving layer contains a resin having a hydroxyl group, it was confirmed that the adhesion between the substrate containing glass and the receiving layer was improved.

[Example 3]
<Manufacture of laminates>
(Manufacture of silver ink composition)
In a beaker, 2-ethylhexylamine (1.3-fold mol amount relative to 2-methylacetoacetate silver described later) and isobutylamine (0.2-fold mol amount based on 2-methylacetoacetate silver described later). Mix and stir for 1 minute using a mechanical stirrer. Here, 52.9 g of silver 2-methylacetoacetate, formic acid (0.4 times molar amount with respect to silver 2-methylacetoacetate), 3,5-dimethyl-1 so that the liquid temperature becomes 25 ° C. or less. -Hexin-3-ol ("Surfinol 61" manufactured by Air Products Japan, hereinafter abbreviated as "DMHO") (0.04-fold molar amount with respect to silver 2-methylacetoacetate) in this order And mixed, and stirred for 2 hours using a mechanical stirrer. Thus, a silver ink composition was obtained. Table 3 shows the types and mixing ratios of the respective components. In Table 3, “alcohol (molar ratio)” means the blending amount (number of moles) of alcohol per mole of forming material of metallic silver ([number of moles of alcohol] / [mol of forming material of metallic silver] Number]). Moreover, "-" in the column of the compounding component in Table 3 means that the component is not compounded.

(Manufacture of laminates)
A laminate was produced in the same manner as in Example 1 except that the silver ink composition obtained above was used.

<Evaluation of laminate>
The laminate was evaluated in the same manner as in Example 1. The results are shown in Table 4.

<Manufacture and evaluation of laminate>
[Example 4]
A laminate was produced and evaluated in the same manner as in Example 3 except that a glass substrate (thickness: 1.5 mm) was used instead of the polyamide substrate containing 60% by mass of glass. The results are shown in Table 4.

[Comparative Example 3]
A laminate was produced in the same manner as in Example 3 except that “AE-421H” manufactured by Ajinomoto Fine Techno Co. was used instead of “JELCON AC-3G” manufactured by Jujo Chemical Co., Ltd. evaluated. The results are shown in Table 4.

[Comparative Example 4]
In place of the base material made of polyamide containing 60% by mass of glass, a glass base material (thickness 1.5 mm) was used, and “JELCON AC-3G” manufactured by Jujo Chemical Co., Ltd. was used as the composition for the receiving layer. The laminate was produced and evaluated in the same manner as in Example 3 except that “AE-421H” manufactured by Ajinomoto Fine Techno Co. was used instead. The results are shown in Table 4.

[Example 5]
<Manufacture of laminates>
(Manufacture of silver ink composition)
Add 2-methylacetoacetate silver to 2-ethylhexylamine (1.0-fold molar amount with respect to 2-methylacetoacetate silver described later) in a beaker so that the liquid temperature is 50 ° C. or less. The mixture was stirred for 15 minutes to obtain a liquid material. To this liquid, formic acid (0.6-fold molar amount with respect to silver 2-methylacetoacetate) was added dropwise over 30 minutes using a syringe pump so that the temperature of the reaction solution was 50 ° C. or lower. After the formic acid was dropped, the reaction solution was further stirred at 25 ° C. for 1 hour to obtain a silver ink composition. Table 3 shows the types and mixing ratios of the respective components.

(Manufacture of laminates)
A laminate was produced in the same manner as in Example 1 except that the silver ink composition obtained above was used.

<Evaluation of laminate>
The laminate was evaluated in the same manner as in Example 1. The results are shown in Table 4.

<Manufacture and evaluation of laminate>
[Example 6]
A laminate was produced and evaluated in the same manner as in Example 5 except that a glass substrate (thickness: 1.5 mm) was used instead of the substrate composed of polyamide containing 60% by mass of glass. The results are shown in Table 4.

[Comparative Example 5]
A laminated body was produced in the same manner as in Example 5 except that “AE-421H” manufactured by Ajinomoto Fine Techno Co. was used instead of “JELCON AC-3G” manufactured by Jujo Chemical Co., Ltd. evaluated. The results are shown in Table 4.

[Comparative Example 6]
In place of the base material made of polyamide containing 60% by mass of glass, a glass base material (thickness 1.5 mm) was used, and “JELCON AC-3G” manufactured by Jujo Chemical Co., Ltd. was used as the composition for the receiving layer. The laminate was produced and evaluated in the same manner as in Example 5 except that “AE-421H” manufactured by Ajinomoto Fine Techno Co. was used instead. The results are shown in Table 4.

As is clear from the above results, in the laminates of Examples 3 to 6, the receiving layer contains a resin having a nitrogen atom and a hydroxyl group, the adhesion between the base material and the receiving layer, and the receiving layer and the silver layer (conductive layer). All of the adhesiveness between the layers satisfied the classification 0, and the adhesiveness between the silver layer and the substrate was excellent. Moreover, the silver layer in the laminated body of these Examples had low volume resistivity, and was excellent in electroconductivity.
Thus, even if the kind of silver ink composition differed, the laminated body of Examples 3-6 had the favorable characteristic similarly to the laminated body of Examples 1-2.

On the other hand, in the laminates of Comparative Examples 3 to 6 containing a resin having a hydroxyl group and no nitrogen atom, the adhesion between the receptor layer and the silver layer was classified as 5, and the receptor layer and the silver layer Peeling occurred at the interface, and the adhesion between the silver layer and the substrate was poor. And in the laminated body of these comparative examples, the volume resistivity of the silver layer was not able to be measured.
Thus, even if the kind of silver ink composition differed, the laminated body of Comparative Examples 3-6 was inferior to the adhesiveness of a silver layer and a base material similarly to the laminated body of Comparative Examples 1-2. .

  INDUSTRIAL APPLICABILITY The present invention can be used for various electronic devices having a silver layer on a base material such as a wiring board, an electromagnetic wave shield, a touch panel, and an antenna of a wireless communication device casing.

  DESCRIPTION OF SYMBOLS 1 ... Laminated body, 11 ... Base material, 11a ... One main surface of a base material, 11b ... The other main surface of a base material, 12 ... Receiving layer, 12a ... Receiving Layer surface, 13 ... conductive layer

Claims (3)

A conductive layer is provided on the substrate via a receiving layer,
The substrate comprises glass;
The receiving layer includes a resin having a nitrogen atom and a hydroxyl group,
A laminate having a volume resistivity of 6 μΩ · cm or less of the conductive layer.   2. The laminate according to claim 1, wherein in the adhesion test of the base material, the receiving layer, and the receiving layer and the conductive layer in accordance with JIS K 5600-5-6, all satisfy classification 0.   An electronic apparatus using the laminate according to claim 1 or 2 and comprising the base material as a casing.

Images