JP6289988B2 - Method for producing silver ink composition - Google Patents

Description

The present invention relates to a method for producing a silver ink composition.

Metallic silver is widely used as a recording material, a printing plate material, and a highly conductive material because of its excellent conductivity.
So far, as a method for producing metal silver, for example, a method using organic acid silver such as silver behenate, silver stearate, silver α-ketocarboxylate, silver β-ketocarboxylate as a material for forming metal silver has been disclosed. ing. In these methods, for example, a silver ink composition in which a metallic silver forming material is blended is prepared, this is printed on a base material, and post-treatment such as heating (firing) treatment is performed on the obtained printed matter. By applying, metallic silver can be formed. Among these, silver β-ketocarboxylate can quickly form metallic silver even when heat-treated at a low temperature of about 210 ° C. or less (see Patent Document 1).

  On the other hand, regarding the metallic silver formed on the base material, it is necessary to variously adjust the thickness according to the intended use such as silver wiring. As a conventional method for adjusting the thickness of the printed ink, there is a method in which a plurality of types having different pattern depths are prepared as printing plates and used separately. However, such a method is not desirable in that the preparation of the plate and the proper use of the plate are complicated, and a printed matter cannot be obtained inexpensively in a short time. The same applies to the case where the above-described silver ink composition is used.

  When using a silver ink composition, as a method of solving such a problem, a base silver ink composition having a large amount of metallic silver forming material is prepared, and the desired thickness of the metallic silver is prepared. Depending on the method, a method of appropriately diluting and using this base silver ink composition can be used. The diluted silver ink composition can adjust the thickness of the metallic silver because the amount of the metallic silver forming material placed on the substrate differs depending on the degree of dilution even when printing using the same plate. .

JP 2009-114232 A

  However, in the method of diluting and using the above-described base silver ink composition, the silver ink composition simply diluted with a solvent has decreased viscosity and surface tension, and the leveling property is too improved. There is a problem in that the printed pattern is distorted on the substrate after printing, and the intended thickness cannot be maintained, resulting in line thickening.

  The present invention has been made in view of the above circumstances, and a silver ink composition that suppresses the thickening of a printed pattern even when a silver ink composition containing a metallic silver forming material is diluted and used. It is an object to provide a product and a method for manufacturing the product.

In order to solve the above-described problems, the present invention provides a silver carboxylate having a group represented by the formula “—COOAg”, an amine compound having a carbon number of 25 or less, a quaternary ammonium salt, ammonia, and the amine compound or ammonia. Carbon dioxide is supplied to the nitrogen-containing compound in a composition (A) in which one or more nitrogen-containing compounds selected from the group consisting of ammonium salts obtained by reacting with an acid and a reducing agent are blended. A method for producing a silver ink composition, comprising the step of adding the composition (B).
In the method for producing a silver ink composition of the present invention, it is preferable shear viscosity at shear rate 0.1～1000S ^-1 at 25 ° C. of the composition (B) is 1 Pa · s or more.

  ADVANTAGE OF THE INVENTION According to this invention, even when the silver ink composition by which the formation material of metallic silver is mix | blended and used is diluted, the silver ink composition by which the line thickness of a printing pattern is suppressed, and its manufacturing method are provided. The

<< Silver Ink Composition and Method for Producing the Same >>
The method for producing a silver ink composition according to the present invention includes a silver carboxylate having a group represented by the formula “—COOAg” (hereinafter abbreviated as “silver carboxylate”), an amine compound having 25 or less carbon atoms, and One or more nitrogen-containing compounds selected from the group consisting of quaternary ammonium salts, ammonia, and ammonium salts obtained by reacting the amine compound or ammonia with an acid (hereinafter abbreviated as “nitrogen-containing compounds”); A step of adding a composition (B) in which carbon dioxide is supplied to the nitrogen-containing compound (hereinafter abbreviated as “addition step”) to a composition (A) in which a reducing agent is blended. It is characterized by that.
According to the said manufacturing method, by diluting a composition (A) using a composition (B), as for the silver ink composition obtained, the line weight of a printing pattern is suppressed notably.

<Composition (A)>
The composition (A) comprises the silver carboxylate, a nitrogen-containing compound and a reducing agent, and can itself be used as a silver ink composition. It corresponds to a thing.

[Silver carboxylate]
The silver carboxylate is a metal silver forming material that forms metal silver by decomposition.
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.

  In the said composition (A), the said carboxylate silver 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 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 (a 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 the remaining raw materials and impurities in the conductor (metal silver) formed by post-treatment such as drying treatment or heating (firing) treatment. 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 a conductor (metal silver) formed by post-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 composition (A), the content of silver derived from the silver carboxylate is preferably 30% by mass or more, and more preferably 50% by mass or more. By being in such a range, the silver ink composition mentioned later can be obtained more easily. 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 70% by mass in consideration of handling properties and the like.
In the present specification, “silver derived from a silver carboxylate” in the composition (A) means silver in the silver carboxylate blended at the time of producing the composition (A) unless otherwise specified. It is a concept that includes both silver constituting silver carboxylate after blending and silver and silver itself in a decomposition product generated by the decomposition of silver carboxylate after blending.

[Nitrogen-containing compounds]
The nitrogen-containing compound is one or more selected from the group consisting of an amine compound having a carbon number of 25 or less, a quaternary ammonium salt, ammonia, and an ammonium salt obtained by reacting the amine compound or ammonia with an acid. .
Hereinafter, an amine compound having 25 or less carbon atoms is referred to as “amine compound”, a quaternary ammonium salt having 25 or less carbon atoms is referred to as “quaternary ammonium salt”, and an ammonium salt obtained by reacting an amine compound having 25 or less carbon atoms with an acid. Is sometimes abbreviated as “ammonium salt derived from an amine compound”, and an ammonium salt formed by reacting ammonia with an acid is sometimes abbreviated as “ammonium salt derived from ammonia”.

  In the composition (A), the nitrogen-containing compounds may be used alone or in combination of two or more. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

(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, sec-butylamine, tert-butylamine, 3-aminopentane, 3 Examples include -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 6 to 10 carbon atoms having a halogen atom as the substituent, 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, sec-butylamine, tert-butylamine, 3-aminopentane, 3-methyl. Butylamine, 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 is preferred. .
Among these amine compounds, 2-ethylhexylamine is excellent in compatibility with the silver carboxylate and is particularly suitable for increasing the concentration of the silver ink composition, and further the surface roughness of the formed conductor. It is mentioned as being particularly suitable for reduction.

(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 composition (A), 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 carboxylate silver. . When the blending amount of the nitrogen-containing compound is within such a range, the composition (A) 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 reducing agent is a component that facilitates formation of metallic silver from the silver carboxylate. That is, the silver ink composition can form metal silver more easily by blending a reducing agent. For example, a conductor (metal silver) having sufficient conductivity even without heat treatment or heat treatment at a low temperature. ) Can be formed.

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 composition (A), the compounding amount of the reducing agent is preferably 0.04 to 3.5 mol, and preferably 0.06 to 2.5 mol, per mol of the carboxylate silver. More preferred. 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 composition (A) may be one in which an alcohol is further blended in addition to the silver carboxylate, the nitrogen-containing compound and the reducing agent.

  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 using acetylene alcohol (2), it is preferable that the compounding quantity of acetylene alcohol (2) is 0.03-0.7 mol per mol of said carboxylate silver in said composition (A). 0.05 to 0.3 mol is more preferable. When the amount of the acetylene alcohol (2) is within such a range, the stability of the composition (A) is further improved.

  In the composition (A), the alcohol may be used alone or in combination of two or more. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

[Other ingredients]
The composition (A) may contain other components other than the silver carboxylate, nitrogen-containing compound, reducing agent and alcohol.
The other components in the composition (A) can be arbitrarily selected according to the purpose, and are not particularly limited. Preferred examples thereof include solvents other than alcohols, and can be arbitrarily determined according to the type and amount of the compounding components. You can choose.
In the composition (A), the other components 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.

  In the composition (A), 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 Even if the component is not blended, the composition (A) (silver ink composition) exhibits its effect sufficiently.

  In the composition (A), all of the blending components may be dissolved, or some or all of the components may be dispersed without dissolving, but all the blending components are dissolved. Preferably, undissolved components are preferably uniformly dispersed.

[Production Method of Composition (A)]
The composition (A) can be obtained by blending the silver carboxylate, the nitrogen-containing compound, the reducing agent, and, if necessary, one or more selected from the group consisting of the alcohol and other components. After the blending of each component, the obtained product may be used as it is as the composition (A), or a product obtained by performing a known purification operation as necessary may be used as the composition (A). In the present invention, particularly when silver β-ketocarboxylate (1) is used as the carboxylate silver, no impurities that inhibit the conductivity are produced at the time of blending the above components, or such impurities are produced. Since the amount can be suppressed to an extremely small amount, a conductor (metal silver) having sufficient conductivity can be obtained even when the composition (A) 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 composition (A), when the undissolved component is uniformly dispersed, it is preferable to apply, for example, 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 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 composition (A) may be further supplied with carbon dioxide. Such a composition (A) has a higher viscosity. For example, a printing method that requires thickening ink, such as a flexographic printing method, a screen printing method, a gravure printing method, a gravure offset printing method, and a pad printing method. It is suitable for application to.

Carbon dioxide may be supplied at any time during the production of the composition (A).
In the present invention, for example, carbon dioxide is supplied to the first mixture in which the silver carboxylate and the nitrogen-containing compound are blended to form a second mixture, and the second mixture It is preferable to manufacture a composition (A) by mix | blending a reducing agent. 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 composition (A) 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 the composition (A) 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 in 20-25 degreeC of a composition (A) was demonstrated here, the temperature at the time of use of a composition (A) 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 composition (A) 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. In other words, a composition 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) can be 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 in the production of the composition (A) that does not use 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, it is preferable to stir the first mixture. For example, it is preferable to stir in the same manner as in the production of the above composition (A) 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.

  What is necessary is just to adjust the viscosity of a 2nd mixture suitably so that a composition (A) may have the target viscosity.

If necessary, the second mixture may further contain one or more selected from the group consisting of the reducing agent, alcohol and other components to form the composition (A).
The composition (A) at this time can be produced by the same method as the above composition (A) that does not use carbon dioxide except that the blending components are different. The obtained composition (A) 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. 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 composition (A) via 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) ] / [Silver carboxylate, nitrogen-containing compound, reducing agent, alcohol, and other components (mass)] × 100) is preferably 10% by mass or less, more preferably 5% by mass or less. Even if 0 mass, that is, no other components are blended, the silver ink composition exhibits its effect sufficiently.

  For example, when the reducing agent is blended, the resulting blend (composition (A)) is relatively easy to generate heat. And when the temperature at the time of compounding of the reducing agent is high, this compound is in a state similar to that at the time of heat treatment of the silver ink composition to be described later. It is speculated that the formation of metallic silver may be initiated in at least part of the acid silver. 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 silver carboxylate, the conductor is formed by post-treatment, either by heat treatment at a lower temperature, or only by drying treatment at room temperature without performing heat treatment. There are things you can do. 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 added to the second mixture, depending on the type of the second mixture or the reducing agent, formation of metallic silver is started in at least a part of the silver carboxylate as described above. May precipitate. Here, when the viscosity of the second mixture is high, aggregation of the precipitated metal silver is suppressed, and the dispersibility of the metal silver in the obtained silver ink composition (composition (A)) 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.

The shear viscosity at a shear rate of 0.1 s ⁻¹ at 25 ° C. of the composition (A) is preferably 1 Pa · s or more, and more preferably 1.5 Pa · s or more. Moreover, the shear viscosity at a shear rate of 0.1 s ⁻¹ at 25 ° C. of the composition (A) is preferably 2000 Pa · s or less, and more preferably 1800 Pa · s or less.
The shear viscosity at a shear rate of 10.8 s ⁻¹ at 25 ° C. of the composition (A) is preferably 1 Pa · s or more, and more preferably 1.5 Pa · s or more. Further, the shear viscosity at a shear rate of 10.8 s ⁻¹ at 25 ° C. of the composition (A) is preferably 60 Pa · s or less, and more preferably 40 Pa · s or less.
The shear viscosity at a shear rate of 1000 s ⁻¹ at 25 ° C. of the composition (A) is preferably 1 Pa · s or more, and more preferably 1.5 Pa · s or more. In addition, the shear viscosity at a shear rate of 1000 s ⁻¹ at 25 ° C. of the composition (A) is preferably 12 Pa · s or less, and more preferably 8 Pa · s or less.
In addition, all the shear viscosity shown here is a measured value at the time of using a rheometer.
Although the shear viscosity at 25 ° C. of the composition (A) has been described here, the temperature at the time of use of the composition (A) is not limited to 25 ° C. and can be arbitrarily selected.

<Composition (B)>
The composition (B) is obtained by supplying (compounding) carbon dioxide to the nitrogen-containing compound, and corresponds to a diluent of the composition (A).
The composition (B) has higher viscosity than the nitrogen-containing compound itself and other solvent components because carbon dioxide is supplied. Therefore, the silver ink composition obtained by adding the composition (B) to the composition (A) has a smaller proportion of the compounded amount of the silver carboxylate relative to the total amount of the compounding components than the composition (A). (Diluted) but high viscosity.

[Nitrogen-containing compounds]
The nitrogen-containing compound in the composition (B) is the same as the nitrogen-containing compound in the composition (A) (that is, the amine compound, the quaternary ammonium salt, ammonia, the ammonium salt derived from the amine compound, and the ammonium derived from ammonia). One or more selected from the group consisting of salts). In the present specification, the nitrogen-containing compound in the composition (A) is referred to as the first nitrogen-containing compound, and the second nitrogen-containing compound in the composition (B) is distinguished from the first nitrogen-containing compound. Sometimes referred to as nitrogen compounds.

  In the composition (B), the nitrogen-containing compound (second nitrogen-containing compound) may be used alone or in combination of two or more. When using 2 or more types together, the combination and ratio can be adjusted arbitrarily.

  The nitrogen-containing compound (second nitrogen-containing compound) in the composition (B) may be the same compound as the nitrogen-containing compound (first nitrogen-containing compound) in the composition (A) or a different compound. Ordinarily, the same compound is preferred.

[carbon dioxide]
Carbon dioxide is a component that makes the composition (B) highly viscous and is presumed to interact with the nitrogen-containing compound.
Carbon dioxide (CO ₂ ) to be supplied may be either gaseous or solid (dry ice), or both gaseous and solid. Carbon dioxide can be supplied to the nitrogen-containing compound by the same method as that used for supplying the first mixture.

  In the composition (B), the supply amount of carbon dioxide may be appropriately adjusted so that the viscosity of the composition (B) becomes a target value, and is not particularly limited.

[Other ingredients]
The composition (B) may be formulated (supplied) with other components other than the nitrogen-containing compound and carbon dioxide.
The said other component in a composition (B) can be arbitrarily selected according to the objective, and is not specifically limited.
In the composition (B), the other components 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.

  In the composition (B), 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 Even if the component is not blended, the composition (B) (silver ink composition) exhibits its effect sufficiently.

The shear viscosity at a shear rate of 0.1 to 1000 s ⁻¹ at 25 ° C. of the composition (B) is preferably 1 Pa · s or more, and more preferably 1.5 Pa · s or more. Further, the shear viscosity at 25 ° C. at a shear rate of 0.1 to 1000 s ⁻¹ of the composition (B) is preferably 16 Pa · s or less, and more preferably 13 Pa · s or less. If the temperature of the composition (B) is the same, the shear viscosity of the composition (B) is usually almost constant regardless of the shear rate.
In addition, all the shear viscosity shown here is a measured value at the time of using a rheometer.
Although the shear viscosity at 25 ° C. of the composition (B) has been described here, the temperature at the time of use of the composition (B) is not limited to 25 ° C. and can be arbitrarily selected.

[Production Method of Composition (B)]
A composition (B) is obtained by mix | blending the said nitrogen-containing compound, a carbon dioxide, and the said other component as needed. After the blending of each component, the obtained product may be used as it is as the composition (B), or a product obtained by performing a known purification operation as necessary may be used as the composition (B).

  Each component can be blended in the same manner as in the case of the composition (A).

[Addition process]
In the method for producing a silver ink composition according to the present invention, an adding step of adding the composition (B) to the composition (A) is performed.
Although the addition amount of the composition (B) in an addition process should just be adjusted suitably according to the kind of composition (B), it is 3-70 mass parts with respect to 100 mass parts of compositions (A). Preferably, it is 5-50 mass parts.

  In the adding step, the composition (B) is added to the composition (A) and then mixed by a known method to obtain a target silver ink composition. As a mixing method at this time, for example, the above-described mixing method at the time of producing the composition (A) can be applied, and a method using a mixer is preferable.

The temperature at the time of addition and mixing of the composition (B) is not particularly limited as long as the composition (A) and the composition (B) are not deteriorated, but is preferably 15 to 30 ° C., and the viscosity at which the mixture is easy to stir. It is good to adjust appropriately so that it becomes.
Moreover, the time at the time of addition and mixing of the composition (B) is not particularly limited as long as the composition (A) and the composition (B) do not deteriorate, but it is preferably 20 seconds to 30 minutes.

  The product obtained in the addition step may be used as it is as the silver ink composition, or the product obtained by performing a known refining operation as necessary may be used as the silver ink composition. In the present invention, particularly when silver β-ketocarboxylate (1) is used as the carboxylate silver, no impurities that inhibit the conductivity are produced at the time of blending the above components, or such impurities are produced. Since the amount can be suppressed to an extremely 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.

<Silver ink composition>
In the silver ink composition obtained by the production method according to the present invention, the composition (A), which is a base silver ink composition, has a high viscosity (high shear viscosity) composition (B) corresponding to a diluent. Therefore, the degree of viscosity reduction at the time of dilution is suppressed, and the line thickness of the pattern (print pattern) formed at the time of printing is suppressed. As a result, the conductor formed by the solidification process of the printed pattern is also suppressed from being thickened. Therefore, even when printing is performed on a substrate with a plate having the same pattern depth using a plurality of types of silver ink compositions having different blending components or addition amounts and different dilutions of the composition (B). In the obtained print pattern, line thickening is suppressed. And it can form stably the printing pattern from which thickness differs on a base material by printing using the multiple types of silver ink composition from which a dilution degree differs.

The shear viscosity at a shear rate of 0.1 s ⁻¹ at 25 ° C. of the silver ink composition is preferably 1 Pa · s or more, and more preferably 1.5 Pa · s or more. Moreover, the shear viscosity at a shear rate of 0.1 s ⁻¹ at 25 ° C. of the silver ink composition is preferably 1800 Pa · s or less, more preferably 1700 Pa · s or less, and 1200 Pa · s or less. More preferably, it is particularly preferably 800 Pa · s or less.
The shear viscosity at a shear rate of 10.8 s ⁻¹ at 25 ° C. of the silver ink composition is preferably 1 Pa · s or more, and more preferably 1.5 Pa · s or more. In addition, the shear viscosity at a shear rate of 10.8 s ⁻¹ at 25 ° C. of the silver ink composition is preferably 30 Pa · s or less, more preferably 28 Pa · s or less, and preferably 20 or less. More preferably, it is particularly preferably 15 Pa · s or less.
The shear viscosity at a shear rate of 1000 s ⁻¹ at 25 ° C. of the silver ink composition is preferably 1 Pa · s or more, and more preferably 1.5 Pa · s or more. Further, the shear viscosity at a shear rate of 1000 s ⁻¹ at 25 ° C. of the silver ink composition is preferably 10 Pa · s or less, more preferably 7 Pa · s or less, and more preferably 4 Pa · s or less. Particularly preferred.
When the shear viscosity at each shear rate is equal to or higher than the lower limit, the line thickness of the print pattern is more significantly suppressed. Moreover, the handleability of a silver ink composition becomes more favorable because the shear viscosity in each shear rate is below the said upper limit. For example, in the printing method using an intaglio (gravure), the intaglio is more satisfactorily filled with the silver ink composition. Moreover, in the printing method using a stencil (screen plate), the silver ink composition is more easily removed from the screen mesh.
In addition, all the shear viscosity shown here is a measured value at the time of using a rheometer.
Here, the shear viscosity at 25 ° C. of the silver ink composition has been described, but the temperature at the time of use of the silver ink composition is not limited to 25 ° C. and can be arbitrarily selected.

  In the silver ink composition, the content of silver derived from the silver carboxylate 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 70% by mass in consideration of handling properties and the like.

<Conductor>
A conductor is obtained by forming metallic silver using the silver ink composition.
More specifically, for example, the conductor can be formed by attaching the silver ink composition to a desired location on the substrate and appropriately selecting a solidification process such as a drying process or a heating (firing) process. . The heat treatment may be performed also as a drying treatment.
The conductor is mainly composed of metallic silver, and the ratio of metallic silver is sufficiently high so that it can be regarded as consisting of only metallic silver. The ratio of metallic silver in the conductor is preferably 99 It is at least mass%.

  The shape of the conductor is not particularly limited and may be patterned. The conductor thus patterned is useful as, for example, a wiring.

  The thickness of the conductor can be arbitrarily set depending on the purpose, but is preferably 5 nm to 10 μm, more preferably 10 nm to 5 μm, and further preferably 50 nm to 3 μm, for example. When the thickness of the conductor is equal to or more than the lower limit, the conductivity can be further improved, and the structure of the conductor can be more stably maintained. Moreover, the laminated body mentioned later can be made thinner by the thickness of a conductor being below the said upper limit.

A base material can select arbitrary shapes according to the objective, For example, it is preferable that it is a film form or a sheet form, it is preferable that thickness is 0.5-5000 micrometers, and it is 0.5-2500 micrometers. Is more preferable.
The surface of the substrate (surface on which the silver ink composition is attached) may be either a flat surface or a curved surface, or may be either a flat surface or an uneven surface. For example, by selecting a specific method for attaching the silver ink composition, such as a pad printing method to be described later, even if the surface of the base material is a curved surface or an uneven surface, the silver ink composition is favorably attached, A conductor can be formed.

The material of the substrate is not particularly limited and may be selected according to the purpose. However, it is preferable to have heat resistance that does not change when a conductor is formed by heat treatment of a silver ink composition described later.
Specifically, the material of the base material is polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polymethylpentene (PMP), polycycloolefin, polystyrene (PS), Acrylic resins such as polyvinyl acetate (PVAc) and polymethyl methacrylate (PMMA), AS resin, ABS resin, polyamide (PA), polyimide, polyamideimide (PAI), polyacetal, polyethylene terephthalate (PET), polybutylene terephthalate ( PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), polyphenylene sulfide (PPS), polysulfone (PSF), polyether sulfone (PES) Polyetherketone (PEK), Polyetheretherketone (PEEK), Polycarbonate (PC), Polyurethane, Polyphenylene ether (PPE), Modified polyphenylene ether (m-PPE), Polyarylate, Epoxy resin, Melamine resin, Phenol resin, Urea Examples thereof include synthetic resins such as resins.
In addition to the above, the material of the substrate can be exemplified by ceramics such as glass and silicon, and paper.
The base material may be a combination of two or more materials such as glass epoxy resin and polymer alloy.

The substrate may be composed of a single layer, or may be composed of two or more layers. When a base material 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 a base material consists of multiple layers, it is good to make it the total thickness of each layer be the thickness of said preferable base material.

A silver ink composition can be made to adhere on a base material by a well-known printing 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.
Among these, the excellent effect of the present invention is remarkably obtained when a pad printing method or the like, which is difficult to handle ordinary diluted ink, is applied.

  At the time of forming the conductor, the thickness of the conductor can be adjusted by adjusting the amount of the silver ink composition to be deposited on the substrate or the blending amount of the silver carboxylate in the silver ink composition.

  When the silver ink composition deposited on the substrate is dried, it may be carried out by a known method, for example, under normal pressure, reduced pressure, or air blowing conditions. It may be performed in any of an active 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 is subjected to a heating (firing) treatment, the conditions may be appropriately adjusted according to the type of compounding component of the silver ink composition. Usually, it is preferable that heating temperature is 60-200 degreeC, and it is more preferable that it is 70-180 degreeC. Although 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. The β-ketocarboxylate (1) is decomposed at a low temperature without using a reducing agent or the like known in the art, unlike a metal silver forming material such as silver oxide. Reflecting such decomposition temperature, the silver ink composition can form metallic silver at an extremely lower temperature than the conventional one as described above.

  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 and pressure reduction.

  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 the component of the silver ink composition and the width and thickness of the conductor to be formed, but it should be 50 to 110 ° C. Preferably, it is 70-90 degreeC. Moreover, 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 5 hours.
In the second stage heat treatment, the heating temperature may be appropriately adjusted according to the type of the compounding component of the silver ink composition and the width and thickness of the conductor to be formed so that the conductor is formed satisfactorily. Although it is good, it is preferable that it is 60-200 degreeC, and it is more preferable that it is 70-180 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.

The conductor may be formed on the substrate via a receiving layer. Here, the “receiving layer” is intended to improve the adhesion between the conductor and the substrate.
The receiving layer may be a known one, for example, formed by preparing a composition for a receiving layer in which a material for forming the receiving layer is blended, adhering it to a substrate, and appropriately performing a post-treatment. it can.

  The shape of the receiving layer is not particularly limited, and may be adjusted according to the shape of the conductor, and may be patterned.

  The thickness of the receiving layer is preferably 0.001 to 20 μm, and more preferably 0.002 to 5 μm. When the thickness of the receiving layer 3 is not less than the lower limit, the adhesion of the conductor is further improved, and when the thickness of the receiving layer is not more than the upper limit, the structure of the receiving layer is more stable. Can hold.

The composition for receiving layer 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, 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.

As described above, a laminate in which a conductor is formed on a substrate through a receiving layer as necessary (hereinafter simply referred to as “laminate”) constitutes various electronic devices, transparent conductive films, and the like. It is suitable for doing.
For example, an electronic device can be configured to use the laminate and include the base material as a casing, and is a known electronic device except that at least a part of the casing is configured with the base material in the stack. It can be set as the same structure. For example, by using a patterned conductor as a circuit, the laminate can be used as a circuit board, and in addition to the laminate, a voice input unit, a voice output unit, an operation switch, a display unit, and the like are combined. A mobile phone can be configured. Further, by using a patterned conductor as an antenna, the laminate can be used as an antenna structure, and the configuration is the same as that of a known data transmitter / receiver 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 conductor as ultrafine wiring or ultrathin wiring, and is known except that the conductor 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 conductor preferably satisfies at least one of such a line width and thickness. If the conductor has such a line width or thickness, its presence is difficult to recognize by visual observation, which is preferable as the transparent conductive film.

Further, in the laminate, it is possible to form the conductor at a low temperature, and since a wide range of materials such as a base material can be selected, 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 silver ink composition>
(Production of Composition (A))
Silver 2-methylacetoacetate in 2-ethylhexylamine (18.82 g, 0.4 molar amount relative to silver 2-methylacetoacetate described later) in a 200 mL beaker so that the liquid temperature is 50 ° C. or lower. (81.18 g) was added and stirred for 20 minutes using a mechanical stirrer to obtain a liquid material. To this liquid, formic acid (11.73 g, 0.7-fold molar amount with respect to silver 2-methylacetoacetate) is dropped over 30 minutes using a syringe pump so that the temperature of the reaction solution is 50 ° C. or less. did. After completion of the dropwise addition of formic acid, the reaction solution was further stirred at 25 ° C. for 2 hours to obtain a composition (A). Table 1 shows the types and blending ratios of each blending component of the composition (A) and the silver content.

Using a rheometer (“MCR301” manufactured by Anton Paar, cone plate CP-25-2 (diameter 25 mm, cone angle 2 °)), the shear viscosity of the resulting composition (A) was measured at 25 ° C. More specifically, after raising the shear rate over a period of 1 minute from 0.1s ^-1 to 1000 s ^-1, it was lowered from 1000 s ^-1 to 0.1s ^-1 over shear rate for 1 minute. Subsequently, the measured value of the viscosity when the shear rate was increased again from 0.1 s ⁻¹ to 1000 s ⁻¹ over 1 minute was adopted as the shear viscosity. As a result, the shear viscosity, 1690Pa · s at a shear rate of 0.1s ^-1, 27.2Pa · s at a shear rate of 10.8s ^-1, was 4.5 Pa · s at a shear rate of 1000 s ^-1.

(Production of composition (B))
A composition (B) was obtained by blowing carbon dioxide gas into 2-ethylhexylamine in a 100 mL beaker at a flow rate of 500 mL / min for 5 minutes.
When the shear viscosity of the obtained composition (B) was measured at 25 ° C. in the same manner as in the case of the composition (A), it was 4.3 Pa · s at a shear rate of 0.1 s ⁻¹ and a shear rate of 10. in 8s ^-1 4.2Pa · s, was 4.0 Pa · s at a shear rate of 1000 s ^-1.

(Manufacture of silver ink composition)
The composition (B) (11 parts by mass) is added to the composition (A) (100 parts by mass) obtained above, and a rotation / revolution mixer ("Shinky Corporation" Awatori Rentaro AR-250 ") Was used for stirring for 30 seconds and defoaming for 30 seconds at 25 ° C. to obtain a silver ink composition. Table 1 shows the silver content of the obtained silver ink composition.

<Evaluation of silver ink composition>
When the shear viscosity of the obtained silver ink composition was measured at 25 ° C. in the same manner as in the case of the composition (A), it was 546 Pa · s at a shear rate of 0.1 s ⁻¹ and a shear rate of 10.8 s ^−1. And 11.5 Pa · s, and the shear rate of 1000 s ⁻¹ was 3.3 Pa · s.
Further, using the obtained silver ink composition, a gravure plate having a line depth of 40 μm and a line width of 1000 μm by a pad printing method, a polyethylene terephthalate (PET) film (“Lumirror S10” manufactured by Toray Industries, Inc., A linear pattern was printed on the thickness (188 μm). And this conductor pattern was formed by heat-processing this linear pattern at 80 degreeC for 5 minute (s). As a result, the formed conductor pattern had a thickness of 0.81 μm and a line width of 1150 μm (a line thickness value of 150 μm). The results are shown in Table 1. Here, “the thickness of the conductor pattern” means that the cross-sectional area and the line width of the conductor pattern are measured using a laser microscope (“VKX-100” manufactured by Keyence Corporation), and the obtained cross-sectional area is represented by a line. The value divided by the width.

[Experimental Example 1]
<Evaluation of composition (A)>
A linear pattern was printed on the substrate by the pad printing method in the same manner as in Example 1 except that the composition (A) was used instead of the silver ink composition obtained above. As a result, the formed linear pattern had a thickness of 1.05 μm and a line width of 1140 μm. The results are shown in Table 1.

[Example 2]
<Production and Evaluation of Silver Ink Composition>
A silver ink composition is produced in the same manner as in Example 1 except that the amount of the composition (B) added to the composition (A) (100 parts by mass) is 20 parts by mass instead of 11 parts by mass. And evaluated. The results are shown in Table 1.

[Example 3]
<Production and Evaluation of Silver Ink Composition>
A composition (B) was produced in the same manner as in Example 1, except that the carbon dioxide gas blowing time was changed to 1 hour instead of 5 minutes. When the shear viscosity of the obtained composition (B) was measured at 25 ° C. in the same manner as in the case of the composition (A), it was 11.6 Pa · s at a shear rate of 0.1 s ⁻¹ and a shear rate of 10. It was 11.4 Pa · s at 8 s ⁻¹ and 9.8 Pa · s at a shear rate of 1000 s ⁻¹ .
And Example was used except that the addition amount of the composition (B) to the composition (A) (100 parts by mass) was changed to 34 parts by mass instead of 11 parts by mass using this composition (B). In the same manner as in No. 1, a silver ink composition was produced and evaluated. The results are shown in Table 1.

[Comparative Example 1]
<Production and Evaluation of Silver Ink Composition>
A silver ink composition was prepared in the same manner as in Example 1 except that 2-ethylhexylamine (11 parts by mass) in which carbon dioxide gas was not blown in place of the composition (B) (11 parts by mass) was used. Manufactured and evaluated. The results are shown in Table 1.

As is clear from the above results, in Example 1 in which dilution was performed, the thickness of the formed conductor pattern could be made thinner than in Example 1 in which dilution was not performed. Further, in Example 1, the line width of the formed conductor pattern was almost the same as that in Experimental Example 1 in which dilution was not performed, and line weighting could be effectively suppressed.
In Examples 2-3, as a result of further increasing the degree of dilution compared to Example 1, the thickness of the formed conductor pattern was made thinner than in Example 1 where no dilution was performed, The fat was also effectively suppressed.
As described above, in Examples 1 to 3, since the line thickness of the conductor pattern was suppressed, it was confirmed that the line pattern before the heat treatment was also suppressed.
On the other hand, in Comparative Example 1, since the composition (B) was not used, the line width of the formed conductor pattern was significantly larger than that of Experimental Example 1 in which dilution was not performed, and was remarkable. A thick line (a thick line pattern) was observed. Moreover, the thickness of the formed conductor pattern was thinner than in the case of Example 1 where the degree of dilution was the same due to the influence of line thickening.

  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.

Claims (2)

A silver carboxylate having a group represented by the formula “—COOAg”;
One or more nitrogen-containing compounds selected from the group consisting of an amine compound having a carbon number of 25 or less and a quaternary ammonium salt, ammonia, and an ammonium salt obtained by reacting the amine compound or ammonia with an acid;
In the composition (A) comprising a reducing agent,
A method for producing a silver ink composition, comprising the step of adding a composition (B) obtained by supplying carbon dioxide to the nitrogen-containing compound. 2. The method for producing a silver ink composition according to claim 1, wherein the composition (B) has a shear viscosity of 1 Pa · s or more at a shear rate of 0.1 to 1000 s ⁻¹ at 25 ° C. 3.