JP2012214898A - Silver-coated copper powder and method for producing the same, and conductive paste, conductive adhesive agent, conductive film, and electric circuit containing the silver-coated copper powder - Google Patents

Silver-coated copper powder and method for producing the same, and conductive paste, conductive adhesive agent, conductive film, and electric circuit containing the silver-coated copper powder Download PDF

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JP2012214898A
JP2012214898A JP2012082434A JP2012082434A JP2012214898A JP 2012214898 A JP2012214898 A JP 2012214898A JP 2012082434 A JP2012082434 A JP 2012082434A JP 2012082434 A JP2012082434 A JP 2012082434A JP 2012214898 A JP2012214898 A JP 2012214898A
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silver
copper powder
powder
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Keisuke Iwasaki
敬介 岩崎
Mineko Osugi
峰子 大杉
Hiroko Morii
弘子 森井
Kazuyuki Hayashi
一之 林
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Toda Kogyo Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/17Metallic particles coated with metal
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20Conductive material dispersed in non-conductive organic material
    • H01B1/22Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00Non-insulated conductors or conductive bodies characterised by their form
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/08Metallic powder characterised by particles having an amorphous microstructure

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Conductive Materials (AREA)
  • Powder Metallurgy (AREA)
  • Non-Insulated Conductors (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a silver-coated copper powder exhibiting excellent conductivity and migration resistance and a method for producing the silver-coated copper powder, and a conductive paste, conductive adhesive agent, conductive film and electric circuit containing the silver-coated copper powder.SOLUTION: In the method for producing a silver-coated copper powder in which a copper powder and a silver fine-particle powder are mixed and stirred and silver fine-particle powder is made to adhere to the particle surfaces of the copper powder, a silver-coated copper powder exhibiting excellent conductivity and migration resistance can be obtained by carrying out all the treatment processes as dry processes and by using, as the silver fine-particle powder, silver fine-particle powder in which the particle surfaces have been surface-coated with a dispersing agent.

Description

本発明は、導電性及び耐マイグレーション性に優れた銀コート銅粉とその製造法、該銀コート銅粉を含有する導電性ペースト、導電性接着剤、導電性膜、及び電気回路に関する。   The present invention relates to a silver-coated copper powder excellent in conductivity and migration resistance and a method for producing the same, a conductive paste containing the silver-coated copper powder, a conductive adhesive, a conductive film, and an electric circuit.

金属微粒子粉末は、プリント配線板の回路形成用部材、各種電気的接点用部材、コンデンサ等の電極用部材などへの導電性粒子粉末として用いられ、これら部材は各種電子デバイスに幅広く使用されている。   Metal fine particle powder is used as conductive particle powder for circuit forming members of printed wiring boards, various electrical contact members, electrode members such as capacitors, etc., and these members are widely used in various electronic devices. .

前述の用途に用いられる導電性粒子粉末としては、金、銀、パラジウム、銅、アルミニウム等の導電性金属微粒子が知られているが、金やパラジウムは高価であるため、一般には、高い導電性が要求される分野では銀が、それ以外の分野では銅が導電性粒子粉末として用いられることが多い。   As the conductive particle powder used in the above-mentioned applications, conductive metal fine particles such as gold, silver, palladium, copper, and aluminum are known. However, since gold and palladium are expensive, in general, they have high conductivity. In other fields, silver is often used as the conductive particle powder, and in other fields, copper is often used as the conductive particle powder.

しかしながら、銀は金やパラジウムに次いで高価であり、また、長期にわたって高湿環境において電圧が印加された場合、マイグレーション現象が起き易く、電極間又は配線間がショートするという問題を有している。   However, silver is expensive next to gold and palladium, and when a voltage is applied in a high humidity environment for a long time, a migration phenomenon is likely to occur, and there is a problem that a short circuit occurs between electrodes or wirings.

一方、銅は安価であり、マイグレーション現象の発生が比較的少ないが、導電性銅ペーストは導電性銀ペーストに比べると導電性が低く、また、耐酸化性に劣るため、導電性ペーストを加熱する際酸化し易く、銅粒子表面に酸化膜を形成して導電性が低下するという問題を有している。   On the other hand, copper is inexpensive and the occurrence of migration phenomenon is relatively small. However, conductive copper paste is less conductive than conductive silver paste and has poor oxidation resistance, so the conductive paste is heated. At this time, it is easy to oxidize, and there is a problem that an oxide film is formed on the surface of the copper particles to lower the conductivity.

これまでに、銅粉の導電性及び耐酸化性を向上させることを目的として、銅粒子表面に銀を被覆させる方法が提案されており、銀粉末と銅粉末を機械的に強制接合させた銀−銅複合粉末(特許文献1)、銀イオンと金属銅との置換反応により、銅粒子の表面に銀が被覆された銀被覆銅粉(特許文献2乃至4)、銀めっき銅粉(特許文献5)等が知られている。   So far, for the purpose of improving the electrical conductivity and oxidation resistance of copper powder, a method of coating the surface of the copper particles with silver has been proposed. -Copper composite powder (Patent Document 1), silver-coated copper powder (Patent Documents 2 to 4), and silver-plated copper powder (Patent Document) in which silver is coated on the surface of copper particles by a substitution reaction of silver ions and metallic copper 5) etc. are known.

特開昭56−155259号公報JP 56-155259 A 特開2002−245849号公報JP 2002-245849 A 特開2004−68111号公報JP 2004-68111 A 特開2006−161081号公報JP 2006-161081 A 特開平9−282935号公報Japanese Patent Laid-Open No. 9-282935

即ち、前出特許文献1には、銀粉末と銅粉末を機械的に強制接合させた銀−銅複合粉末が記載されているが、銅粉末表面に付着させる銀粉末の表面性(表面処理)については何も考慮されていないことから、後出比較例に示す通り、分散剤によって表面処理されていない銀粒子を銅粉末に機械的に付着させた場合には、銀粒子同士が凝集する傾向にあるため、マイグレーション現象が生じやすいという問題を有している。   That is, the above-mentioned patent document 1 describes a silver-copper composite powder in which silver powder and copper powder are mechanically forcibly joined, but the surface property (surface treatment) of the silver powder adhered to the copper powder surface. Since no consideration is given to the case, as shown in the comparative example below, when silver particles not surface-treated with a dispersant are mechanically attached to the copper powder, the silver particles tend to aggregate together Therefore, there is a problem that a migration phenomenon is likely to occur.

また、前出特許文献2乃至特許文献4には、銀イオンと金属銅との置換反応により、銅粒子の表面に銀が被覆された銀被覆銅粉とその製造方法が記載されているが、いずれも水溶液中での湿式反応であるため、銅粉の酸化が生じると共に、粒子表面が銀によって均一に被覆されることにより、マイグレーション現象が生じやすいという問題を有している。   Moreover, in the above-mentioned patent documents 2 thru | or patent documents 4, although the silver covering copper powder by which the silver particle was coat | covered by the substitution reaction of silver ion and metallic copper, and the manufacturing method are described, Since both are wet reactions in an aqueous solution, the copper powder is oxidized and the particle surface is uniformly coated with silver, thereby causing a problem that a migration phenomenon tends to occur.

また、前出特許文献5には、銀めっき銅粉が記載されているが、銀めっき銅粉は、ペースト混練時に銀めっきの剥離が発生し易く、マイグレーション現象が生じやすいという問題を有している。   Moreover, although the above-mentioned patent document 5 describes silver-plated copper powder, the silver-plated copper powder has a problem that silver plating is easily peeled off during paste kneading and a migration phenomenon easily occurs. Yes.

そこで、本発明は、導電性及び耐マイグレーション性に優れた銀コート銅粉を提供することを技術的課題とする。   Then, this invention makes it a technical subject to provide the silver coat copper powder excellent in electroconductivity and migration resistance.

前記技術的課題は、次の通りの本発明によって達成できる。   The technical problem can be achieved by the present invention as follows.

即ち、本発明は、銅粉の表面に、分散剤により粒子表面が被覆された銀微粒子粉末が付着しており、銅粉の平均粒子径(D50)と銀微粒子の平均粒子径(DSEM)との比(D50/DSEM)が3〜200の範囲であることを特徴とする銀コート銅粉である(本発明1)。 That is, in the present invention, the silver fine particle powder whose particle surface is coated with the dispersant is attached to the surface of the copper powder, and the average particle size (D 50 ) of the copper powder and the average particle size (D SEM ) of the silver fine particles. ) Is a silver-coated copper powder characterized in that the ratio (D 50 / D SEM ) is in the range of 3 to 200 (Invention 1).

また、本発明は、レーザー回折散乱粒度分布による平均粒子径(D50)が0.1〜30μmであることを特徴とする本発明1の銀コート銅粉である(本発明2)。 Further, the present invention is the silver-coated copper powder of the present invention 1 (Invention 2), wherein the average particle diameter (D 50 ) by laser diffraction scattering particle size distribution is 0.1 to 30 μm.

また、本発明は、銅粉100重量部に対して分散剤により粒子表面が被覆された銀微粒子の付着量が1〜100重量部であることを特徴とする本発明1又は本発明2の銀コート銅粉である(本発明3)。   Further, in the present invention, the silver of the present invention 1 or the present invention 2 is characterized in that the adhesion amount of silver fine particles whose particle surface is coated with a dispersant is 1 to 100 parts by weight with respect to 100 parts by weight of copper powder. It is a coated copper powder (Invention 3).

また、本発明は、銀微粒子粉末の表面被覆に用いる分散剤が、数平均分子量1,000以上の高分子系分散剤から選ばれる1種又は2種以上からなることを特徴とする本発明1から本発明3の銀コート銅粉である(本発明4)。   Further, in the present invention, the dispersant used for the surface coating of the silver fine particle powder is composed of one or more selected from polymer dispersants having a number average molecular weight of 1,000 or more. To the silver-coated copper powder of the present invention 3 (present invention 4).

また、本発明は、銅粉末と銀微粒子粉末とを混合攪拌して銅粉末の粒子表面に銀微粒子粉末を付着させる銀コート銅粉の製造法において、全処理工程を乾式で行うと共に、銀微粒子粉末として粒子表面を分散剤により表面被覆された銀微粒子粉末を用いることを特徴とする本発明1から本発明4の製造法である(本発明5)。   Further, the present invention provides a silver coated copper powder manufacturing method in which a copper fine particle powder and a silver fine particle powder are mixed and stirred to adhere the silver fine particle powder to the surface of the copper powder. This is the production method of the present invention 1 to the present invention 4 (invention 5) characterized in that a silver fine particle powder whose particle surface is coated with a dispersant is used as the powder (Invention 5).

また、本発明は、本発明1から本発明4の銀コート銅粉を含む導電性接着剤である(本発明6)。   Moreover, this invention is a conductive adhesive containing the silver coat copper powder of this invention 1 to this invention 4 (this invention 6).

また、本発明は、本発明1から本発明4の銀コート銅粉を含む導電性ペーストである(本発明7)。   Moreover, this invention is an electrically conductive paste containing the silver coat copper powder of this invention 1 to this invention 4 (this invention 7).

また、本発明は、本発明7の導電性ペーストを用いて形成された導電性膜である(本発明8)。   Moreover, this invention is a conductive film formed using the electrically conductive paste of this invention 7 (this invention 8).

また、本発明は、本発明7の導電性ペーストを用いて形成された電気回路である(本発明9)。   Moreover, this invention is an electric circuit formed using the electrically conductive paste of this invention 7 (this invention 9).

本発明に係る銀コート銅粉は、導電性、導電性及び耐マイグレーション性に優れているので、導電性ペースト及び導電性接着剤等の原料として好適である。   Since the silver coat copper powder which concerns on this invention is excellent in electroconductivity, electroconductivity, and migration resistance, it is suitable as raw materials, such as an electroconductive paste and an electroconductive adhesive agent.

本発明に係る銀コート銅粉を用いた導電性ペースト並びに導電性接着剤は、耐マイグレーション性及び導電性に優れたプリント配線基板等を提供することができるので、各種電子デバイスに用いられる導電性ペースト及び導電性接着剤として好適である。   Since the conductive paste and the conductive adhesive using the silver-coated copper powder according to the present invention can provide a printed wiring board and the like excellent in migration resistance and conductivity, the conductivity used in various electronic devices. Suitable as paste and conductive adhesive.

本発明の構成をより詳しく説明すれば、次の通りである。   The configuration of the present invention will be described in more detail as follows.

まず、本発明に係る銀コート銅粉について述べる。   First, the silver coat copper powder concerning this invention is described.

本発明に係る銀コート銅粉は、銅粉の表面に、分散剤により粒子表面が被覆された銀微粒子粉末が付着していることを特徴とする銀コート銅粉である。   The silver-coated copper powder according to the present invention is a silver-coated copper powder characterized in that a silver fine particle powder whose particle surface is coated with a dispersant is attached to the surface of the copper powder.

本発明における銅粉としては、その種類、製法等に制限はなく、通常の電解法、還元法、アトマイズ法、機械的粉砕などから得られる銅粉を用いることができる。   There is no restriction | limiting in the kind, manufacturing method, etc. as a copper powder in this invention, The copper powder obtained from a normal electrolysis method, a reduction method, an atomizing method, mechanical grinding | pulverization etc. can be used.

本発明における銅粉の粒子形状は特に限定されず、球状、樹枝状、鱗片状、フレーク状、針状、板状、粒状等を用いることができる。また、形状の異なる銅粉を組み合わせて用いてもよい。   The particle shape of the copper powder in the present invention is not particularly limited, and a spherical shape, a dendritic shape, a scale shape, a flake shape, a needle shape, a plate shape, a granular shape, and the like can be used. Moreover, you may use combining the copper powder from which a shape differs.

銅粉のレーザー回折散乱粒度分布による平均粒子径(D50)は0.1〜30μmであり、好ましくは0.1〜20μm、より好ましくは0.1〜10μmである。平均粒子径(D50)の異なる銅粉を組み合わせて用いてもよい。平均粒子径(D50)が0.1μm未満の場合には、粒子の微細化によって表面酸化が起こりやすくなり、導電性が低下するため好ましくない。また、平均粒子径(D50)が30μmを超える場合には、これを用いて得られる銀コート銅粉と該銀コート銅粉より得られた導電性ペーストの印刷性及び充填性が低下するため、高い導電性を有する導電性ペーストを得ることが困難となる。 The average particle diameter measured by a laser diffraction scattering particle size distribution of the copper powder (D 50) is 0.1 to 30 [mu] m, preferably 0.1 to 20 [mu] m, more preferably 0.1 to 10 [mu] m. It may be used in combination with different copper powder of an average particle diameter (D 50). When the average particle size (D 50 ) is less than 0.1 μm, surface oxidation is likely to occur due to particle miniaturization, and conductivity is lowered, which is not preferable. Further, when the average particle diameter (D 50) is more than 30μm, since the printability and filling properties of the silver-coated copper powder and silver coated copper powder from the obtained conductive paste obtained is reduced with this It becomes difficult to obtain a conductive paste having high conductivity.

本発明における銅粉のBET比表面積値は、0.1〜4.0m/gであることが好ましく、より好ましくは0.2〜3.0m/gである。BET比表面積値が4.0m/gを超える場合には、粒子粉末の表面積が大きすぎるため表面酸化が起こりやすくなり、導電性が低下するため好ましくない。 It is preferable that the BET specific surface area value of the copper powder in this invention is 0.1-4.0 m < 2 > / g, More preferably, it is 0.2-3.0 m < 2 > / g. When the BET specific surface area value exceeds 4.0 m 2 / g, the surface area of the particle powder is too large, so that surface oxidation is liable to occur and conductivity is lowered, which is not preferable.

本発明における銀微粒子粉末としては、その種類、製法等に制限はなく、通常の機械的粉砕法、アアトマイズ法、湿式還元法、電解法、気相法などの公知の方法で得られた銀微粒子粉末を用いることができる。   The silver fine particle powder in the present invention is not limited in its type, production method, and the like, and silver fine particles obtained by a known method such as a normal mechanical pulverization method, an atomization method, a wet reduction method, an electrolysis method, or a gas phase method Powder can be used.

本発明における銀微粒子の粒子形状は特に限定されず、球状、粒状、不定形、樹枝状、フレーク状、鱗片状、板状、針状等を用いることができるが、球状、粒状もしくは不定形であることが好ましい。   The particle shape of the silver fine particles in the present invention is not particularly limited, and may be spherical, granular, amorphous, dendritic, flake, flaky, plate-like, needle-like, etc., but spherical, granular or amorphous Preferably there is.

銀微粒子粉末の平均粒子径(DSEM)は、0.01〜3μmであることが好ましく、より好ましくは0.02〜2μm、更により好ましくは0.03〜1μmである。平均粒子径(DSEM)が0.01μm未満の場合には、銀微粒子粉末の微細化により活性が高すぎて不安定あるため、常温におけるハンドリングが困難である。 The average particle diameter (D SEM ) of the silver fine particle powder is preferably 0.01 to 3 μm, more preferably 0.02 to 2 μm, and still more preferably 0.03 to 1 μm. When the average particle diameter (D SEM ) is less than 0.01 μm, it is difficult to handle at room temperature because the activity is too high and unstable due to the refinement of the silver fine particle powder.

本発明に係る銀コート銅粉は、銅粉の平均粒子径(D50)と銀微粒子粉末の平均粒子径(DSEM)との比(D50/DSEM)が3〜200の範囲であり、好ましくは4〜150、より好ましくは5〜100である。銅粉の平均粒子径(D50)と銀微粒子粉末の平均粒子径(DSEM)との比(D50/DSEM)が3未満の場合には、銅粉の平均粒子径(D50)に対して銀微粒子粉末の平均粒子径(DSEM)が大きすぎるため、銅粉の粒子表面へ銀微粒子粉末をコートすることが困難となる。銅粉の平均粒子径(D50)と銀微粒子粉末の平均粒子径(DSEM)との比(D50/DSEM)が200を超える場合には、工業的に容易に製造することが困難となる。 In the silver-coated copper powder according to the present invention, the ratio (D 50 / D SEM ) of the average particle diameter (D 50 ) of the copper powder and the average particle diameter (D SEM ) of the silver fine particle powder is in the range of 3 to 200. , Preferably 4 to 150, more preferably 5 to 100. The ratio of the average particle size of the copper powder and the (D 50) and the average particle diameter of the silver fine powder (D SEM) in the case of less than (D 50 / D SEM) is 3, the average particle diameter (D 50) of copper powder On the other hand, since the average particle diameter (D SEM ) of the silver fine particle powder is too large, it becomes difficult to coat the silver fine particle powder on the particle surface of the copper powder. When the ratio (D 50 / D SEM ) of the average particle diameter (D 50 ) of the copper powder and the average particle diameter (D SEM ) of the silver fine particle powder exceeds 200, it is difficult to easily produce industrially. It becomes.

銀微粒子粉末の粒子表面を被覆する分散剤としては、数平均分子量が1,000以上の高分子系分散剤を用いることができる。   As the dispersant for coating the particle surface of the silver fine particle powder, a polymer dispersant having a number average molecular weight of 1,000 or more can be used.

前記高分子系分散剤としては、一般に顔料分散剤として市販されているものを使用することができ、具体的には、ANTI−TERRA−U、ANTI−TERRA−205、DISPERBYK−101、DISPERBYK−102、DISPERBYK−106、DISPERBYK−108、DISPERBYK−109、DISPERBYK−110、DISPERBYK−111、DISPERBYK−112、DISPERBYK−116、DISPERBYK−130、DISPERBYK−140、DISPERBYK−142、DISPERBYK−145、DISPERBYK−161、DISPERBYK−162、DISPERBYK−163、DISPERBYK−164、DISPERBYK−166、DISPERBYK−167、DISPERBYK−168、DISPERBYK−170、DISPERBYK−171、DISPERBYK−174、DISPERBYK−180、DISPERBYK−182、DISPERBYK−183、DISPERBYK−184、DISPERBYK−185、DISPERBYK−2000、DISPERBYK−2001、DISPERBYK−2008、DISPERBYK−2009、DISPERBYK−2020、DISPERBYK−2025、DISPERBYK−2050、DISPERBYK−2070、DISPERBYK−2150、DISPERBYK−2155、DISPERBYK−2163、DISPERBYK−2164、BYK−P104、BYK−P104S、BYK−P105、BYK−9076、BYK−9077、BYK−220S、(ビックケミー・ジャパン株式会社製);EFKA 4008、EFKA 4009、EFKA 4046、EFKA 4047、EFKA 4010、EFKA 4015、EFKA 4020、EFKA 4050、EFKA 4055、EFKA 4060、EFKA 4080、EFKA 4300、EFKA 4330、EFKA 4400、EFKA 4401、EFKA 4402、EFKA 4403、EFKA 4406、EFKA 4800、EFKA 5010、EFKA 5044、EFKA 5244、EFKA 5054、EFKA 5055、EFKA 5063、EFKA 5064、EFKA 5065、EFKA 5066、EFKA 5070(BASFジャパン株式会社製);SOLSPERSE 3000、SOLSPERSE 13240、SOLSPERSE 13940、SOLSPERSE 16000、SOLSPERSE 17000、SOLSPERSE 18000、SOLSPERSE 20000、SOLSPERSE 21000、SOLSPERSE 24000SC、SOLSPERSE 24000GR、SOLSPERSE 26000、SOLSPERSE 27000、SOLSPERSE 28000、SOLSPERSE 31845、SOLSPERSE 32000、SOLSPERSE 32500、SOLSPERSE 32550、SOLSPERSE 34750、SOLSPERSE 35100、SOLSPERSE 35200、SOLSPERSE 36000、SOLSPERSE 36600、SOLSPERSE 37500、SOLSPERSE 38500、SOLSPERSE 39000、SOLSPERSE 41000(日本ルーブリゾール株式会社製);アジスパーPB821、アジスパーPB822、アジスパーPB881、アジスパーPN−411、アジスパーPA−111、(味の素ファインテクノ株式会社製);DISPARLON KS−860、DISPARLON KS−873N、DISPARLON 7004、DISPARLON 1831、DISPARLON 1850、DISPARLON 1860、DISPARLON DA−7301、DISPARLON DA−325、DISPARLON DA−375、DISPARLON DA−234(楠本化成株式会社製);フローレン DOPA−15B、フローレン DOPA−17HF、フローレン DOPA−22、フローレン DOPA−33、フローレン G−700、フローレン G−820、フローレン G−900(共栄社化学株式会社製)等が挙げられる。これらの顔料分散剤は、1種類又は2種類以上を組み合わせて使用してもよい。   As the polymer dispersant, commercially available pigment dispersants can be used, and specifically, ANTI-TERRA-U, ANTI-TERRA-205, DISPERBYK-101, DISPERBYK-102. , DISPERBYK-106, DISPERBYK-108, DISPERBYK-109, DISPERBYK-110, DISPERBYK-111, DISPERBYK-112, DISPERBYK-116, DISPERBYK-130, DISPERBYK-140, DISPERBYK-142, DISPERBYK-SPER45 -162, DISPERBYK-163, DISPERBYK-164, DISPERBYK-166, DI PERBYK-167, DISPERBYK-168, DISPERBYK-170, DISPERBYK-171, DISPERBYK-174, DISPERBYK-180, DISPERBYK-182, DISPERBYK-183, DISPERBYK-184, DISPERBYK-185, DISPERBYK-185, DISPERBYK-185 2008, DISPERBYK-2009, DISPERBYK-2020, DISPERBYK-2025, DISPERBYK-2050, DISPERBYK-2070, DISPERBYK-2150, DISPERBYK-2155, DISPERBYK-2163, DISPERBYK-2164, BYK-P104, BYK-P 4S, BYK-P105, BYK-9076, BYK-9077, BYK-220S, (manufactured by BYK Japan); EFKA 4008, EFKA 4009, EFKA 4046, EFKA 4047, EFKA 4010, EFKA 4015, EFKA 4015, EFKA 4015 , EFKA 4055, EFKA 4060, EFKA 4080, EFKA 4300, EFKA 4330, EFKA 4400, EFKA 4401, EFKA 4402, EFKA 4403, EFKA 4406, EFKA 4800, EFKA 5010, EFKA 4800, EFKA 4800 5063, EFKA 5064, EFKA 5065, EFKA 5066, EFKA 5070 (manufactured by BASF Japan Ltd.); , SOLSPERSE 32000, SOLSPERSE 32500, SOLSPERSE 32550, SOLSPERSE 34750, SOLSPERSE 35100, SOLSPERSE 35 00, SOLSPERSE 36000, SOLSPERSE 36600, SOLSPERSE 37500, SOLSPERSE 38500, SOLSPERSE 39000, SOLSPERSE 41000 (manufactured by Nippon Lubrizol Co., Ltd.); Manufactured by Techno Co., Ltd .; DISPARLON KS-860, DISPARLON KS-873N, DISPARLON 7004, DISPARLON 1831, DISPARLON 1850, DISPARLON 1860, DISPARLON DA-7301, DISPARLON DA-325, DISPARLONDA-375 ISPALLON DA-234 (manufactured by Enomoto Kasei Co., Ltd.); Floren DOPA-15B, Floren DOPA-17HF, Floren DOPA-22, Floren DOPA-33, Floren G-700, Floren G-820, Floren G-900 (Kyoeisha Chemical Co., Ltd.) Company-made). These pigment dispersants may be used alone or in combination of two or more.

分散剤の数平均分子量は1,000以上であることが好ましく、より好ましくは1,000〜150,000、更により好ましくは5,000〜100,000である。数平均分子量が1,000未満の分散剤を表面処理した銀微粒子粉末は、分散剤を処理した効果が不十分であり、銀微粒子が凝集する傾向があるため、銅粉への付着処理が困難である。一方、数平均分子量が150,000を超える場合には分散剤の粘度が上がり、銀微粒子粉末への表面被覆処理が困難となるため好ましくない。   The number average molecular weight of the dispersant is preferably 1,000 or more, more preferably 1,000 to 150,000, and still more preferably 5,000 to 100,000. The silver fine particle powder surface-treated with a dispersant having a number average molecular weight of less than 1,000 is insufficient in the effect of treating the dispersant, and the silver fine particles tend to agglomerate, making it difficult to adhere to copper powder. It is. On the other hand, when the number average molecular weight exceeds 150,000, the viscosity of the dispersant is increased, which makes it difficult to coat the surface of the silver fine particle powder.

また、上記分散剤として、酸価とアミン価の両方を有する分散剤もしくは、酸価を有する分散剤とアミン価を有する分散剤とを併用することが好ましく、該特性を有する分散剤を銀微粒子粉末に表面処理することにより、銀微粒子を銅粉の粒子表面へより効果的に処理することが可能となる。   Further, as the dispersant, a dispersant having both an acid value and an amine value, or a dispersant having an acid value and a dispersant having an amine value are preferably used together. By surface-treating the powder, the silver fine particles can be more effectively treated on the surface of the copper powder particles.

酸価を有する分散剤としては、代表的なものとして、DISPERBYK−102、DISPERBYK−110、DISPERBYK−111、DISPERBYK−170、DISPERBYK−171、DISPERBYK−174、BYK−P104、BYK−P104S、BYK−P105、BYK−220S、EFKA 5010、EFKA 5065、EFKA 5066、EFKA 5070、SOLSPERSE 3000、SOLSPERSE 16000、SOLSPERSE 17000、SOLSPERSE 18000、SOLSPERSE 21000、SOLSPERSE 27000、SOLSPERSE 28000、SOLSPERSE 36000、SOLSPERSE 36600、SOLSPERSE 38500、SOLSPERSE 39000、SOLSPERSE 41000、アジスパーPN−411、アジスパーPA−111等である。   Representative examples of the dispersant having an acid value include DISPERBYK-102, DISPERBYK-110, DISPERBYK-111, DISPERBYK-170, DISPERBYK-171, DISPERBYK-174, BYK-P104, BYK-P104S, BYK-P105. , BYK-220S, EFKA 5010, EFKA 5065, EFKA 5066, EFKA 5070, SOLPERSE 3000, SOLPERSE 16000, SOLPERSE 17000, SOLPERSE 18000, SOLPERSE 21000, SOLSPER SE27000, SOLSPER SE27000, SOLSPERSE 38500, SOLSPERSE 39000, SOLSPERSE 41000, Addisper PN-411, Addisper PA-111 and the like.

アミン価を有する分散剤としては、代表的なものとして、DISPERBYK−108、DISPERBYK−109、DISPERBYK−112、DISPERBYK−116、DISPERBYK−161、DISPERBYK−162、DISPERBYK−163、DISPERBYK−164、DISPERBYK−166、DISPERBYK−167、DISPERBYK−168、DISPERBYK−182、DISPERBYK−183、DISPERBYK−184、DISPERBYK−185、DISPERBYK−2000、DISPERBYK−2008、DISPERBYK−2009、DISPERBYK−2050、DISPERBYK−2150、DISPERBYK−2155、DISPERBYK−2163、DISPERBYK−2164、BYK−9077、EFKA 4046、EFKA 4047、EFKA 4015、EFKA 4020、EFKA 4050、EFKA 4055、EFKA 4060、EFKA 4080、EFKA 4300、EFKA 4330、EFKA 4400、EFKA 4401、EFKA 4402、EFKA 4403、EFKA 4800、SOLSPERSE 20000等である。   Representative examples of the dispersant having an amine value include DISPERBYK-108, DISPERBYK-109, DISPERBYK-112, DISPERBYK-116, DISPERBYK-161, DISPERBYK-162, DISPERBYK-163, DISPERBYK-164, DISPERBYK-166. DISPERBYK-167, DISPERBYK-168, DISPERBYK-182, DISPERBYK-183, DISPERBYK-184, DISPERBYK-185, DISPERBYK-2000, DISPERBYK-2008, DISPERBYK-2009, DISPERBYK-20B, 150 K-2163, DISPERBYK-2164, BYK-9077, EFKA 4046, EFKA 4047, EFKA 4015, EFKA 4020, EFKA 4050, EFKA 4055, EFKA 4060, EFKA 4080, EFKA 4300, EFKA 4300, E43A , EFKA 4403, EFKA 4800, SOLPERSE 20000, and the like.

酸価とアミン価の両方を有する分散剤としては、代表的なものとして、ANTI−TERRA−U、ANTI−TERRA−205、DISPERBYK−101、DISPERBYK−106、DISPERBYK−130、DISPERBYK−140、DISPERBYK−142、DISPERBYK−145、DISPERBYK−180、DISPERBYK−2001、DISPERBYK−202、DISPERBYK−2025、DISPERBYK−2070、BYK−9076、EFKA 4008、EFKA 4009、EFKA 4010、EFKA 4406、EFKA 5044、EFKA 5244、EFKA 5054、EFKA 5055、EFKA 5063、EFKA 5064、SOLSPERSE 13240、SOLSPERSE 13940、SOLSPERSE 24000SC、SOLSPERSE 24000GR、SOLSPERSE 26000、SOLSPERSE 31845、SOLSPERSE 32000、SOLSPERSE 32500、SOLSPERSE 32550、SOLSPERSE 34750、SOLSPERSE 35100、SOLSPERSE 35200、SOLSPERSE 37500、アジスパーPB821、アジスパーPB822、アジスパーPB881等である。 As typical dispersants having both an acid value and an amine value, ANTI-TERRA-U, ANTI-TERRA-205, DISPERBYK-101, DISPERBYK-106, DISPERBYK-130, DISPERBYK-140, DISPERBYK- 142, DISPERBYK-145, DISPERBYK- 180, DISPERBYK-2001, DISPERBYK-202 0, DISPERBYK-2025, DISPERBYK-2070, BYK-9076, EFKA 4008, EFKA 4009, EFKA 4010, EFKA 4406, EFKA 5044, EFKA 5244, EFKA 5054, EFKA 5055, EFKA 5063, EFKA 5064, SOLPERSE 132 40, SOLSPERSE 13940, SOLSPERSE 24000SC, SOLSPERSE 24000GR, SOLSPERSE 26000, SOLSPERSE 31845, SOLSPERSE 32000, SOLSPERSE 32500, SOLSPERSE 32550, SOLSPER35 34ER, SOLSPER35347

分散剤の被覆量は、銀微粒子のBET表面積値にもよるが、銀微粒子粉末に対して0.1〜5.0重量%が好ましく、より好ましくは0.2〜4.0重量%である。0.1重量%未満の場合には、分散剤の処理量が不十分であり、銀微粒子粉末が凝集しやすいため、銅粉への付着処理が困難である。5.0重量%を超える場合には、銀微粒子粉末の凝集を抑制することはできるが、導電性に関与しない有機物成分が増えるため好ましくない。   The coating amount of the dispersant is preferably 0.1 to 5.0% by weight, more preferably 0.2 to 4.0% by weight based on the silver fine particle powder, although it depends on the BET surface area value of the silver fine particles. . When the amount is less than 0.1% by weight, the treatment amount of the dispersant is insufficient, and the silver fine particle powder tends to aggregate, so that the adhesion treatment to the copper powder is difficult. When the amount exceeds 5.0% by weight, aggregation of the silver fine particle powder can be suppressed, but an organic component not involved in conductivity increases, which is not preferable.

本発明に係る銀コート銅粉のレーザー回折散乱粒度分布による平均粒子径(D50)は0.1〜30μmであり、好ましくは0.1〜20μm、より好ましくは0.1〜10μmである。平均粒子径(D50)の異なる銀コート銅粉を組み合わせて用いてもよい。平均粒子径(D50)が0.1μm未満の場合には、粒子の微細化によって表面酸化が起こりやすくなり、導電性が低下するため好ましくない。また、平均粒子径(D50)が30μmを超える場合には、これを用いて得られた導電性ペーストの印刷性及び充填性が低下するため、高い導電性を有する導電性ペーストを得ることが困難となる。 The average particle diameter measured by a laser diffraction scattering particle size distribution of the silver-coated copper powder according to the present invention (D 50) is 0.1 to 30 [mu] m, preferably 0.1 to 20 [mu] m, more preferably 0.1 to 10 [mu] m. Silver-coated copper powders having different average particle diameters (D 50 ) may be used in combination. When the average particle size (D 50 ) is less than 0.1 μm, surface oxidation is likely to occur due to particle miniaturization, and conductivity is lowered, which is not preferable. Further, when the average particle diameter (D 50) is more than 30μm, since the printing property and filling property of the resulting conductive paste decreases by using this, is possible to obtain a conductive paste having high conductivity It becomes difficult.

本発明に係る銀コート銅粉の粒子形状は特に限定されず、球状、樹枝状、フレーク状、鱗片状、針状、板状、粒状等を用いることができる。また、形状の異なる銀コート銅粉を組み合わせて用いてもよい。   The particle shape of the silver coat copper powder which concerns on this invention is not specifically limited, A spherical shape, dendritic shape, flake shape, scale shape, needle shape, plate shape, a granular form, etc. can be used. Moreover, you may use combining silver coating copper powder from which a shape differs.

本発明に係る銀コート銅粉のBET比表面積値は、0.1〜7.0m/gであることが好ましく、より好ましくは0.2〜6.0m/gである。BET比表面積値が7.0m/gを超える場合には、粒子粉末の表面積が大きすぎるため表面酸化が起こりやすくなり、導電性が低下するため好ましくない。 BET specific surface area of the silver-coated copper powder according to the present invention is preferably 0.1~7.0m 2 / g, more preferably 0.2~6.0m 2 / g. When the BET specific surface area value exceeds 7.0 m 2 / g, the surface area of the particle powder is too large, so that surface oxidation is liable to occur and conductivity is lowered, which is not preferable.

本発明に係る銀コート銅粉に付着している銀微粒子の割合は、銅粉のBET比表面積値にもよるが、銅粉100重量部に対して分散剤により粒子表面が被覆された銀微粒子が1〜100重量部であることが好ましく、より好ましくは2〜80重量部、更により好ましくは3〜60重量部である。分散剤により粒子表面が被覆された銀微粒子による被覆量が1重量部未満の場合には、銀微粒子の付着量が少なすぎるため、銀微粒子を被覆したことによる十分な導電性向上効果が得られない。また、芯材である銅粉の露出面が多くなり、銅粉が酸化されて十分な導電性を確保することが困難となる。一方、銀微粒子は高価であるため、耐酸化性及び導電性の改善効果と、得られる銀コート銅粉のコストとのバランスを考慮すると、その上限は100重量部である。また、粒子表面の銀微粒子の存在量が増えるため、銀のマイグレーション現象が起こりやすくなるため好ましくない。   Although the ratio of the silver fine particles adhering to the silver coat copper powder which concerns on this invention is based also on the BET specific surface area value of copper powder, the silver fine particle by which the particle | grain surface was coat | covered with the dispersing agent with respect to 100 weight part of copper powder. Is preferably 1 to 100 parts by weight, more preferably 2 to 80 parts by weight, and even more preferably 3 to 60 parts by weight. When the coating amount of the silver fine particles whose particle surface is coated with the dispersant is less than 1 part by weight, the adhesion amount of the silver fine particles is too small, so that a sufficient conductivity improving effect by coating the silver fine particles can be obtained. Absent. Moreover, the exposed surface of the copper powder which is a core material increases, and copper powder is oxidized and it becomes difficult to ensure sufficient electroconductivity. On the other hand, since silver fine particles are expensive, the upper limit is 100 parts by weight in consideration of the balance between the effect of improving oxidation resistance and conductivity and the cost of the resulting silver-coated copper powder. Further, since the abundance of silver fine particles on the particle surface is increased, a silver migration phenomenon tends to occur, which is not preferable.

本発明に係る銀コート銅粉のT−C量(全炭素量)は、0.1〜4%の範囲にあることが好ましく、より好ましくは0.1〜3%、更により好ましくは0.1〜2%である。T−C量が4%を超える場合には、導電性に関与しない有機物成分が増えるため好ましくない。   The TC amount (total carbon amount) of the silver-coated copper powder according to the present invention is preferably in the range of 0.1 to 4%, more preferably 0.1 to 3%, and still more preferably 0.00. 1-2%. When the amount of TC exceeds 4%, organic components not involved in conductivity increase, which is not preferable.

本発明に係る銀コート銅粉は、銅粉の粒子表面が銀微粒子によって均一に被覆されている必要はなく、銅粉の一部が露出していても差し支えない。銅粉の粒子表面が均一に被覆されている場合、耐マイグレーション性が低下するため好ましくない。   In the silver-coated copper powder according to the present invention, the particle surface of the copper powder need not be uniformly coated with silver fine particles, and a part of the copper powder may be exposed. When the particle surface of the copper powder is uniformly coated, the migration resistance is lowered, which is not preferable.

次に、本発明に係る銀コート銅粉の製造方法について述べる。   Next, the manufacturing method of the silver coat copper powder concerning this invention is described.

本発明に係る銀コート銅粉は、銅粉末と粒子表面を分散剤により表面被覆された銀微粒子粉末とを混合攪拌して銅粉末の粒子表面に銀微粒子粉末を付着させることによって得ることができる。   The silver-coated copper powder according to the present invention can be obtained by mixing and stirring the copper powder and the silver fine particle powder whose particle surface is coated with a dispersing agent and attaching the silver fine particle powder to the particle surface of the copper powder. .

分散剤による銀微粒子の被覆処理は、分散剤と銀微粒子とを適当な溶媒中で混合攪拌した後、濾別・乾燥することによって行う。溶媒としては、分散剤が溶解するものであれば何を用いてもよい。乾燥は、銀微粒子の焼結が生じないよう、低温で行うことが好ましい。   The coating treatment of the silver fine particles with the dispersant is performed by mixing and stirring the dispersant and the silver fine particles in an appropriate solvent, followed by filtration and drying. Any solvent may be used as long as it dissolves the dispersant. Drying is preferably performed at a low temperature so that silver fine particles are not sintered.

銅粉と分散剤により表面被覆された銀微粒子粉末との混合攪拌は、粉体層に機械的エネルギーを加えることのできる装置が好ましく、例えば、ボール型混練機、ホイール型混練機を用いることができ、ボール型混練機がより効果的に使用できる。   For the mixing and stirring of the copper powder and the silver fine particle powder whose surface is coated with a dispersing agent, an apparatus capable of applying mechanical energy to the powder layer is preferable. For example, a ball-type kneader or a wheel-type kneader is used. And a ball-type kneader can be used more effectively.

前記ボール型混練機としては、振動ミル、回転ミル、サンドグラインダ等があり、好ましくは振動ミルである。前記ホイール型混練機としては、エッジランナー(「ミックスマラー」、「シンプソンミル」、「サンドミル」と同義語である)、マルチマル、ストッツミル、ウエットパンミル、コナーミル、リングマラー等がある。   Examples of the ball-type kneader include a vibration mill, a rotary mill, a sand grinder, and preferably a vibration mill. Examples of the wheel-type kneader include edge runners (synonymous with “mix muller”, “Simpson mill”, “sand mill”), multi-mal, stotz mill, wet pan mill, conner mill, ring muller, and the like.

本発明においては、銅粉と分散剤により表面被覆された銀微粒子粉末との混合攪拌は、全工程を乾式で行うと共に、銅粉の酸化による導電性の低下を防止するためにN雰囲気下で行うことが好ましい。 In the present invention, the mixing and stirring of the copper powder and the silver fine particle powder whose surface is coated with a dispersing agent is performed in a dry manner, and the N 2 atmosphere is used in order to prevent a decrease in conductivity due to oxidation of the copper powder. It is preferable to carry out at

次に、本発明に係る銀微粒子を含む導電性ペーストについて述べる。   Next, the conductive paste containing silver fine particles according to the present invention will be described.

本発明に係る導電性ペーストは、本発明に係る銀コート銅粉及び溶剤からなり、必要に応じて、バインダー樹脂、硬化剤、分散剤、レオロジー調整剤等の他の成分を配合してもよい。また、本発明の趣旨を損なわない範囲で、本発明に係る銀コート銅粉の他に白金、金、銀、銅、パラジウム等の金属粉末やカーボンなど任意の導電性フィラーを組み合わせることができる。   The conductive paste according to the present invention is composed of the silver-coated copper powder according to the present invention and a solvent, and may contain other components such as a binder resin, a curing agent, a dispersant, and a rheology modifier as necessary. . Moreover, in the range which does not impair the meaning of this invention, arbitrary conductive fillers, such as metal powder, such as platinum, gold | metal | money, silver, copper, palladium, and carbon other than the silver coat copper powder concerning this invention can be combined.

バインダー樹脂としては、当該分野において公知のものを使用することができ、例えば、メチルセルロース、エチルセルロース、ヒドロキシエチルセルロース、ニトロセルロース、エチルセルロース誘導体等のセルロース系樹脂、ポリエステル樹脂、ウレタン変性ポリエステル樹脂、エポキシ変性ポリエステル樹脂、アクリル変性ポリエステル等の各種変性ポリエステル樹脂、ポリウレタン樹脂、塩化ビニル・酢酸ビニル共重合体、アクリル系樹脂、エポキシ系樹脂、フェノール系樹脂、メラミン樹脂、アルキド樹脂、ブチラール樹脂、ポリビニルアルコール、ポリイミド樹脂、ポリアミドイミド樹脂、アミノ樹脂、スチレン系樹脂、レゾール樹脂及びガラスフリット等の無機バインダー等が挙げられる。これらバインダー樹脂は、単独でも、又は2種類以上を併用することもできる。   As the binder resin, those known in the art can be used, for example, cellulose resins such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, nitrocellulose, ethyl cellulose derivatives, polyester resins, urethane-modified polyester resins, epoxy-modified polyester resins. , Various modified polyester resins such as acrylic modified polyester, polyurethane resin, vinyl chloride / vinyl acetate copolymer, acrylic resin, epoxy resin, phenolic resin, melamine resin, alkyd resin, butyral resin, polyvinyl alcohol, polyimide resin, Examples thereof include inorganic binders such as polyamideimide resin, amino resin, styrene resin, resol resin, and glass frit. These binder resins can be used alone or in combination of two or more.

溶剤としては、当該分野において公知のものを使用することができ、例えば、テトラデカン、トルエン、キシレン、エチルベンゼン、ジエチルベンゼン、イソプロピルベンゼン、アミルベンゼン、p−シメン、テトラリン及び石油系芳香族炭化水素混合物等の炭化水素系溶剤;エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノ−n−ブチルエーテル、プロピレングリコールモノ−t−ブチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコ−ルモノブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノブチルエーテル、トリプロピレングリコールモノメチルエーテル等のエーテル又はグリコールエーテル系溶剤;エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、エチレングリコールモノブチルエーテルアセテート、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート等のグリコールエステル系溶剤;酢酸エチル、酢酸ブチル等のエステル系溶剤;メチルイソブチルケトン、メチルエチルケトン、シクロヘキサノン等のケトン系溶剤;テルピネオール、リナロール、ゲラニオール、シトロネロール等のテルペンアルコール;メタノール、エタノール、プロパノール、n−ブタノール、s−ブタノール、t−ブタノール等のアルコール系溶剤;エチレングリコール、ジエチレングリコール等のグリコール系溶剤;γ−ブチロラクトン、ジオキサン、ジメチルアセトアミド、ジメチルホルムアミド、N−メチルピロリドン及び水等が挙げられる。溶剤は、単独でも、又は2種類以上を併用することもできる。   As the solvent, those known in the art can be used, for example, tetradecane, toluene, xylene, ethylbenzene, diethylbenzene, isopropylbenzene, amylbenzene, p-cymene, tetralin and petroleum aromatic hydrocarbon mixtures. Hydrocarbon solvents: ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-butyl ether, propylene glycol mono-t-butyl ether, diethylene glycol monoethyl ether, diethylene glyco- Monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monobutyl ether, Ether or glycol ether solvents such as pyrene glycol monomethyl ether; glycol ester solvents such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate Ester solvents such as ethyl acetate and butyl acetate; ketone solvents such as methyl isobutyl ketone, methyl ethyl ketone, and cyclohexanone; terpene alcohols such as terpineol, linalool, geraniol, and citronellol; methanol, ethanol, propanol, n-butanol, and s-butanol , Alcohol solvents such as t-butanol; Call, glycol solvent such as diethylene glycol; .gamma.-butyrolactone, dioxane, dimethylacetamide, dimethylformamide, N- methylpyrrolidone and water, and the like. Solvents can be used alone or in combination of two or more.

導電性ペースト中の銀コート銅粉の含有量は用途に応じて様々であるが、例えば配線形成用途の場合などは可能な限り100重量%に近いことが好ましい。   The content of the silver-coated copper powder in the conductive paste varies depending on the application. For example, in the case of wiring formation, it is preferably as close to 100% by weight as possible.

本発明に係る導電性ペーストは、各成分を、ライカイ機、ポットミル、三本ロールミル、回転式混合機、二軸ミキサー等の各種混練機、分散機を用いて、混合・分散させることにより得ることができる。   The conductive paste according to the present invention is obtained by mixing and dispersing each component using various kneaders and dispersers such as a laika machine, a pot mill, a three roll mill, a rotary mixer, a twin screw mixer, and the like. Can do.

本発明に係る導電性ペーストは、スクリーン印刷、凹版印刷、平板印刷、インクジェット法、グラビア印刷、転写印刷、ロールコート、フローコート、スプレー塗装、スピンコート、ディッピング、ブレードコート、めっき等各種塗布方法に適用可能である。   The conductive paste according to the present invention is applied to various coating methods such as screen printing, intaglio printing, flat plate printing, inkjet method, gravure printing, transfer printing, roll coating, flow coating, spray coating, spin coating, dipping, blade coating, plating, etc. Applicable.

また、本発明に係る導電性ペーストは、FPD(フラットパネルディスプレイ)、太陽電池、有機EL等の電極形成やLSI基板の配線形成、更には微細なトレンチ、ビアホール、コンタクトホールの埋め込み等の配線形成材料として用いることができる。また、積層セラミックコンデンサや積層インダクタの内部電極形成用等の高温での焼成用途はもちろん、低温焼成が可能であることからフレキシブル基板やICカード、その他の基板上への配線形成材料及び電極形成材料として好適である。また、導電性被膜として電磁波シールド膜や赤外線反射シールド等にも用いることができる。エレクトロニクス実装においては電子部品と絶縁基材を接続する導電性接着剤、鉛代替はんだ材として用いることもできる。   In addition, the conductive paste according to the present invention is used for forming electrodes such as FPD (flat panel display), solar cell, organic EL, wiring for LSI substrates, and wiring for filling fine trenches, via holes, contact holes, etc. It can be used as a material. In addition to firing applications at high temperatures, such as for the formation of internal electrodes for multilayer ceramic capacitors and multilayer inductors, as well as low temperature firing, it is possible to form wiring and materials for wiring on flexible substrates, IC cards, and other substrates. It is suitable as. Moreover, it can also be used for an electromagnetic wave shielding film, an infrared reflection shield, etc. as a conductive film. In electronics mounting, it can also be used as a conductive adhesive or lead substitute solder material for connecting electronic components and insulating substrates.

<作用>
本発明において重要な点は、銅粉の表面に、分散剤により粒子表面が被覆された銀微粒子粉末が付着していることを特徴とする銀コート銅粉は、導電性及び耐マイグレーション性に優れているという事実である。
<Action>
The important point in the present invention is that the silver-coated copper powder, in which the silver fine particle powder whose particle surface is coated with a dispersant is attached to the surface of the copper powder, is excellent in conductivity and migration resistance. It is the fact that

本発明に係る銀コート銅粉が導電性及び耐マイグレーション性に優れている理由について、本発明者は次のように考えている。即ち、本発明の製造法は、これまでに知られている銀イオンと金属銅との置換反応により銅粒子の表面に銀を被覆する方法や、銀めっき法のように水溶液中で処理を行わないため、銅粉が水溶液中で酸化することによる導電性の低下を防ぐことができる。また、めっき処理のように粒子表面が銀で一面に覆われた場合、マイグレーション現象が生じやすいが、本発明の銀コート銅粉は銅粒子の粒子表面が均一に被覆されていないため、マイグレーション現象の発生を抑制できたものと考えている。更に、銀微粒子の粒子表面が分散剤で処理されていることにより、付着させた銅粒子表面からの銀微粒子のはがれが起きにくいことも、耐マイグレーション性に優れている一因と考えている。   The present inventor considers the reason why the silver-coated copper powder according to the present invention is excellent in conductivity and migration resistance as follows. That is, the production method of the present invention is a method of coating silver on the surface of copper particles by a known substitution reaction between silver ions and metallic copper, or a treatment in an aqueous solution like a silver plating method. Therefore, the electroconductive fall by copper powder oxidizing in aqueous solution can be prevented. In addition, when the particle surface is covered with silver as in the plating process, a migration phenomenon is likely to occur, but the silver-coated copper powder of the present invention is not uniformly coated with the copper particle surface, so the migration phenomenon We think that we were able to suppress outbreak of. Furthermore, the fact that the surface of the silver fine particles is treated with a dispersant, and thus the silver fine particles are not easily peeled off from the surface of the attached copper particles, is considered to be one of the reasons for excellent migration resistance.

以下に、本発明における実施例を示し、本発明を具体的に説明する。 Examples of the present invention are shown below, and the present invention will be specifically described.

分散剤によって表面処理された銀微粒子の平均粒子径(DSEM)は、走査型電子顕微鏡写真「S−4800」(HITACHI製)を用いて粒子の写真を撮影し、該写真を用いて粒子100個以上について粒子径を測定し、その平均値を算出し、平均粒子径(DSEM)とした。 The average particle diameter (D SEM ) of the silver fine particles surface-treated with the dispersant was obtained by taking a photograph of the particles using a scanning electron micrograph “S-4800” (manufactured by HITACHI), and using the photograph, the particles 100 The particle diameter was measured for at least one particle, the average value was calculated, and the average particle diameter ( DSEM ) was obtained.

なお、銀コート銅粉の銀微粒子による銅粉の被覆状態は、上記走査型電子顕微鏡写真「S−4800」(HITACHI製)によって粒子を観察することにより行った。   The coating state of the copper powder with the silver fine particles of the silver-coated copper powder was performed by observing the particles with the scanning electron micrograph “S-4800” (manufactured by HITACHI).

銅粉及び銀コート銅粉の平均粒子径(D50)は、レーザー回折散乱式粒度分布測定器「LMS−2000e」(株式会社セイシン企業製)を用いて測定し、粒度分布測定において累積値が50%となる粒子径として示した。 The average particle size (D 50 ) of the copper powder and the silver-coated copper powder is measured using a laser diffraction / scattering particle size distribution measuring device “LMS-2000e” (manufactured by Seishin Enterprise Co., Ltd.). The particle diameter is shown as 50%.

銅粉、分散剤によって表面処理された銀微粒子及び銀コート銅粉の比表面積は、「モノソーブMS−11」(カンタクロム株式会社製)を用いて、BET法により測定した値で示した。   The specific surface areas of the copper fine particles, the silver fine particles surface-treated with the dispersant, and the silver-coated copper powder were shown as values measured by the BET method using “Monosorb MS-11” (manufactured by Kantachrome Co., Ltd.).

銅粉、銀微粒子の粒子表面に処理されている分散剤及び銀コート銅粉の炭素量(T−C)は、「堀場金属炭素・硫黄分析装置EMIA−2200型」(株式会社堀場製作所製)を用い、炭素量を測定することにより求めた。   The amount of carbon (TC) of the copper powder, the dispersant treated on the surface of the silver fine particles and the silver-coated copper powder (TC) is “Horiba Metal Carbon / Sulfur Analyzer EMIA-2200” (manufactured by Horiba, Ltd.) Was determined by measuring the carbon content.

銀コート銅粉を構成する銅及び銀の含有量は、試料0.2g、硝酸5ml及びイオン交換水10mlを50mlのフッ素樹脂製ビーカーへ入れ、240℃で15分保持して溶解させ、この溶液を「誘導結合プラズマ発光分光分析装置 iCAP6500Duo」(サーモフィッシャーサイエンティフィック株式会社製)を用いて測定した。   The content of copper and silver constituting the silver-coated copper powder is as follows: 0.2 g of sample, 5 ml of nitric acid and 10 ml of ion-exchanged water are placed in a 50 ml fluororesin beaker and kept at 240 ° C. for 15 minutes for dissolution. Was measured using an “inductively coupled plasma emission spectrometer iCAP6500Duo” (manufactured by Thermo Fisher Scientific Co., Ltd.).

導電性塗膜の比抵抗は、後述する導電性ペーストを厚み50μmのポリイミドフィルム上に塗布し、120℃で10分間予備乾燥した後、210℃で10分間加熱させることにより得られた導電性膜について、4端子電気抵抗測定装置「ロレスタGP/MCP−T610」(株式会社ダイアインスツルメンツ製)を用いて測定し、シート抵抗と膜厚より比抵抗を算出した。   The specific resistance of the conductive coating film was obtained by applying a conductive paste described later on a polyimide film having a thickness of 50 μm, predrying at 120 ° C. for 10 minutes, and heating at 210 ° C. for 10 minutes. About, measured using 4 terminal electrical resistance measuring apparatus "Loresta GP / MCP-T610" (made by Dia Instruments Co., Ltd.), and calculated specific resistance from sheet resistance and film thickness.

導電性塗膜の耐マイグレーション性は、厚み50μmのポリイミドフィルム上に、後述する導電性ペーストを用いて、中央に0.75mmのギャップのある線幅0.75mm、長さ25.0mmのパターンを乾燥膜厚が10〜30μmになるようにスクリーン印刷し、150℃で30分加熱乾燥したものを試料とした。次いで、上記ギャップ間に注射器ニチペットLe(株式会社ニチリョー製)で蒸留水0.02mlをゆるやかに滴下し、直流電源 R6142(株式会社ADVANTEST製)で3V印加し、デジタルマルチメータ R6871E(株式会社ADVANTEST製)で電流値を測定して、電流値が0.1mAになるまでの時間を測定し、5回の測定値の平均値で評価した。時間が長いほど耐マイグレーション性は良好であることを示す。   The migration resistance of the conductive coating film is obtained by forming a pattern with a line width of 0.75 mm and a length of 25.0 mm with a gap of 0.75 mm in the center using a conductive paste described later on a polyimide film having a thickness of 50 μm. A sample was screen-printed so as to have a dry film thickness of 10 to 30 μm and dried by heating at 150 ° C. for 30 minutes. Next, 0.02 ml of distilled water is gently dropped with a syringe Nichipet Le (manufactured by Nichiyo Co., Ltd.) between the gaps, 3 V is applied with a DC power supply R6142 (manufactured by ADVANTEST Co., Ltd.), and a digital multimeter R6871E (manufactured by ADVANTEST Co., Ltd.) is applied. ), The current value was measured, the time until the current value reached 0.1 mA was measured, and the average value of the five measured values was evaluated. The longer the time, the better the migration resistance.

次に、実施例及び比較例を示す。 Next, examples and comparative examples are shown.

銀微粒子1:
銀微粒子 100gにメタノール 155gを加えて攪拌した後、20gのメタノールにDISPERBYK−106 1.4g(銀微粒子に対して分散剤が1.4wt%に相当)を添加・攪拌して調整したDISPERBYK−106のメタノール溶液を上記銀微粒子のメタノール溶液に加え、温度40℃において100分間攪拌・混合を行った。
Silver fine particles 1:
155 g of methanol was added to 100 g of silver fine particles and stirred, and then DISPERBYK-106 prepared by adding 1.4 g of DISPERBYK-106 (corresponding to 1.4 wt% of the silver fine particles) and stirring to 20 g of methanol. Was added to the methanol solution of the silver fine particles, and the mixture was stirred and mixed at a temperature of 40 ° C. for 100 minutes.

得られた混合溶液を40℃において減圧乾燥を行い、分散剤により粒子表面が被覆された銀微粒子1を得た。   The obtained mixed solution was dried under reduced pressure at 40 ° C. to obtain silver fine particles 1 whose particle surfaces were coated with a dispersant.

得られた銀微粒子1は、平均粒子径DSEMが78nm、BET比表面積値が3.4m/g、T−Cが0.91%の不定形粒子であった。 The obtained silver fine particles 1 were amorphous particles having an average particle diameter DSEM of 78 nm, a BET specific surface area value of 3.4 m 2 / g, and TC of 0.91%.

銀微粒子2〜7:
銀微粒子の種類、分散剤の種類及び添加量を変化させた以外は、前記銀微粒子1と同様にして分散剤によって粒子表面が被覆された銀微粒子粉末を得た。得られた銀微粒子粉末の特性を表1に示す。
Silver fine particles 2 to 7:
A silver fine particle powder having the particle surface coated with a dispersant was obtained in the same manner as the silver fine particle 1 except that the type of silver fine particles, the type of dispersant, and the amount added were changed. The characteristics of the obtained silver fine particle powder are shown in Table 1.

Figure 2012214898
Figure 2012214898

銅粉1〜4:
銅粉として表2に示す特性を有する銅粉を用意した。
Copper powder 1-4:
Copper powder having the characteristics shown in Table 2 was prepared as copper powder.

Figure 2012214898
Figure 2012214898

<実施例1−1:銀コート銅粉の製造>
銅粉1(形状:樹枝状、平均粒子径D50:4.0μm、BET比表面積値:0.35m/g、T−C:0.02%)2kgを振動ミル「MB1」(メディア:φ11m/mの樹脂コート球 3.9kg)(製品名、中央化工機株式会社製)に投入し、次いで、銀微粒子1(形状:不定形、平均粒子径DSEM:78nm、BET比表面積値:3.4m/g)200gを添加し、回転数1200rpm、振幅6mmで180分間混合攪拌を行い、実施例1−1の銀コート銅粉を得た。
<Example 1-1: Production of silver-coated copper powder>
Copper powder 1 (shape: dendritic, average particle diameter D 50 : 4.0 μm, BET specific surface area value: 0.35 m 2 / g, TC: 0.02%) 2 kg of vibration mill “MB1” (media: Fai11m / resin coated spheres 3.9kg of m) (product name, was placed in the center Kakoki Co., Ltd.), then the silver particles 1 (shape: amorphous, average particle diameter D SEM: 78 nm, BET specific surface area: (3.4 m 2 / g) 200 g was added, and the mixture was stirred for 180 minutes at a rotation speed of 1200 rpm and an amplitude of 6 mm to obtain a silver-coated copper powder of Example 1-1.

得られた銀コート銅粉の粒子形状は樹脂状、平均粒子径(D50)は3.7nm、BET比表面積値は0.40m/gであり、T−Cは0.15%、Ag含有量は8.92%、Cu含有量は90.93%であった。銅粉の平均粒子径(D50)と銀微粒子粉末の平均粒子径(DSEM)との比(D50/DSEM)は51であった。SEM観察の結果、銅粉の表面に銀が存在していることを確認した。 The obtained silver-coated copper powder has a resinous particle shape, an average particle size (D 50 ) of 3.7 nm, a BET specific surface area value of 0.40 m 2 / g, TC of 0.15%, Ag The content was 8.92% and the Cu content was 90.93%. The ratio (D 50 / D SEM ) between the average particle size (D 50 ) of the copper powder and the average particle size (D SEM ) of the silver fine particle powder was 51. As a result of SEM observation, it was confirmed that silver was present on the surface of the copper powder.

<実施例2−1:導電性ペーストの製造>
実施例1−1の銀コート銅粉100重量部に対してポリエステル樹脂のジエチレングリコールモノブチルエーテルアセテート溶液(固形分35%)及び硬化剤1.4重量部と、導電性ペーストにおける銀コート銅粉の含有量が70wt%となるようにジエチレングリコールモノブチルエーテルアセテートとジエチレングリコールモノエチルエーテルアセテートの混合溶液を加え、プレミックスを行った後、3本ロールを用いて均一に混練・分散処理を行い、導電性ペーストを得た。
<Example 2-1: Production of conductive paste>
Polyethylene resin diethylene glycol monobutyl ether acetate solution (solid content 35%) and curing agent 1.4 parts by weight with respect to 100 parts by weight of silver-coated copper powder of Example 1-1, and inclusion of silver-coated copper powder in the conductive paste Add a mixed solution of diethylene glycol monobutyl ether acetate and diethylene glycol monoethyl ether acetate so that the amount becomes 70 wt%, and after premixing, uniformly knead and disperse using three rolls to obtain the conductive paste. Obtained.

得られた導電性ペーストを、厚み50μmのポリイミドフィルム上に塗布し、比抵抗値測定用は210℃で10分間加熱乾燥し、耐マイグレーション測定用は150℃で10分間加熱乾燥して導電性塗膜を得た。   The obtained conductive paste was applied onto a polyimide film having a thickness of 50 μm, and was dried by heating at 210 ° C. for 10 minutes for specific resistance measurement, and heated and dried at 150 ° C. for 10 minutes for measurement of migration resistance. A membrane was obtained.

得られた導電性塗膜の比抵抗値は1.6×10−2Ω・cmであり、耐マイグレーション性は592secであった。 The specific resistance value of the obtained conductive coating film was 1.6 × 10 −2 Ω · cm, and the migration resistance was 592 sec.

前記実施例1−1及び実施例2−1に従って銀コート銅粉及び導電性ペーストを作製した。各製造条件及び得られた銀コート銅粉及び導電性ペーストの諸特性を示す。   A silver-coated copper powder and a conductive paste were prepared according to Example 1-1 and Example 2-1. Various characteristics of each production condition and the obtained silver-coated copper powder and conductive paste are shown.

実施例1−2〜1−5及び比較例1−1〜1−4:
銅粉の種類、銀微粒子の種類及び添加量を変化させた以外は、前記実施例1−1と同様にして銀コート銅粉を得た。
Examples 1-2 to 1-5 and Comparative Examples 1-1 to 1-4:
A silver-coated copper powder was obtained in the same manner as in Example 1-1 except that the type of copper powder, the type of silver fine particles, and the amount added were changed.

このときの製造条件を表3に、得られた銀コート銅粉の諸特性を表4に示す。   The production conditions at this time are shown in Table 3, and various characteristics of the obtained silver-coated copper powder are shown in Table 4.

Figure 2012214898
Figure 2012214898

Figure 2012214898
Figure 2012214898

実施例2−2〜2−5及び比較例2−1〜2−7:
銀コート銅粉の種類を種々変化させた以外は、前記実施例2−1の導電性ペーストの作製方法に従って導電性ペースト及び導電性塗膜を製造した。なお、比較例2−7の導電性粒子は市販の銀メッキ銅粉(粒子形状:樹脂状、平均粒子径(D50):12.27nm、BET比表面積値:0.55m/g、T−C:0.09%、Ag含有量:10.08%、Cu含有量:89.92%)である。
Examples 2-2 to 2-5 and comparative examples 2-1 to 2-7:
Except having changed the kind of silver coat copper powder variously, the electrically conductive paste and the electrically conductive coating film were manufactured in accordance with the preparation method of the electrically conductive paste of the said Example 2-1. The conductive particles of Comparative Example 2-7 were commercially available silver-plated copper powder (particle shape: resinous, average particle diameter (D 50 ): 12.27 nm, BET specific surface area value: 0.55 m 2 / g, T -C: 0.09%, Ag content: 10.08%, Cu content: 89.92%).

このときの製造条件及び得られた導電性塗膜の諸特性を表5に示す。   Table 5 shows the production conditions at this time and various characteristics of the obtained conductive coating film.

Figure 2012214898
Figure 2012214898

本発明に係る銀コート銅粉は、導電性、導電性及び耐マイグレーション性に優れているので、導電性ペースト及び導電性接着剤等の原料として好適である。   Since the silver coat copper powder which concerns on this invention is excellent in electroconductivity, electroconductivity, and migration resistance, it is suitable as raw materials, such as an electroconductive paste and an electroconductive adhesive agent.

本発明に係る銀コート銅粉を用いた導電性ペースト並びに導電性接着剤は、耐マイグレーション性及び導電性に優れたプリント配線基板等を提供することができるので、各種電子デバイスに用いられる導電性ペースト及び導電性接着剤として好適である。
Since the conductive paste and the conductive adhesive using the silver-coated copper powder according to the present invention can provide a printed wiring board and the like excellent in migration resistance and conductivity, the conductivity used in various electronic devices. Suitable as paste and conductive adhesive.

Claims (9)

銅粉の表面に、分散剤により粒子表面が被覆された銀微粒子粉末が付着しており、銅粉の平均粒子径(D50)と銀微粒子の平均粒子径(DSEM)との比(D50/DSEM)が3〜200の範囲であることを特徴とする銀コート銅粉。 A silver fine particle powder whose particle surface is coated with a dispersant is attached to the surface of the copper powder, and the ratio of the average particle size (D 50 ) of the copper powder to the average particle size (D SEM ) of the silver fine particles (D 50 / D SEM ) is in the range of 3-200. レーザー回折散乱粒度分布による平均粒子径(D50)が0.1〜30μmであることを特徴とする請求項1記載の銀コート銅粉。 2. The silver-coated copper powder according to claim 1, wherein an average particle diameter (D 50 ) by laser diffraction scattering particle size distribution is 0.1 to 30 μm. 銅粉100重量部に対して分散剤により粒子表面が被覆された銀微粒子の付着量が1〜100重量部である請求項1又は請求項2記載の銀コート銅粉。 The silver-coated copper powder according to claim 1 or 2, wherein the adhesion amount of silver fine particles whose particle surface is coated with a dispersant is 1 to 100 parts by weight with respect to 100 parts by weight of the copper powder. 銀微粒子粉末の表面被覆に用いる分散剤が、数平均分子量1,000以上の高分子系分散剤から選ばれる1種又は2種以上からなることを特徴とする請求項1から請求項3のいずれかに記載の銀コート銅粉。 4. The dispersant according to claim 1, wherein the dispersant used for the surface coating of the silver fine particle powder is one or more selected from polymer dispersants having a number average molecular weight of 1,000 or more. The silver coat copper powder of crab. 銅粉末と銀微粒子粉末とを混合攪拌して銅粉末の粒子表面に銀微粒子粉末を付着させる銀コート銅粉の製造法において、全処理工程を乾式で行うと共に、銀微粒子粉末として粒子表面を分散剤により表面被覆された銀微粒子粉末を用いることを特徴とする請求項1から請求項4のいずれかに記載の銀コート銅粉の製造法。 In the silver-coated copper powder manufacturing method, in which the copper powder and silver fine particle powder are mixed and stirred to adhere the silver fine particle powder to the surface of the copper powder, all processing steps are performed in a dry process and the particle surface is dispersed as a silver fine particle powder. The method for producing silver-coated copper powder according to any one of claims 1 to 4, wherein silver fine particle powder whose surface is coated with an agent is used. 請求項1から請求項4のいずれかに記載の銀コート銅粉を含む導電性接着剤。 The electroconductive adhesive agent containing the silver coat copper powder in any one of Claims 1-4. 請求項1から請求項4のいずれかに記載の銀コート銅粉を含む導電性ペースト。 The electrically conductive paste containing the silver coat copper powder in any one of Claims 1-4. 請求項7記載の導電性ペーストを用いて形成された導電性膜。 A conductive film formed using the conductive paste according to claim 7. 請求項7記載の導電性ペーストを用いて形成された電気回路。 An electric circuit formed using the conductive paste according to claim 7.
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