JP2010192429A - Conductive paste, and translucent electric conduction film and its manufacturing method - Google Patents
Conductive paste, and translucent electric conduction film and its manufacturing method Download PDFInfo
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- JP2010192429A JP2010192429A JP2010009961A JP2010009961A JP2010192429A JP 2010192429 A JP2010192429 A JP 2010192429A JP 2010009961 A JP2010009961 A JP 2010009961A JP 2010009961 A JP2010009961 A JP 2010009961A JP 2010192429 A JP2010192429 A JP 2010192429A
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- conductive paste
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0094—Shielding materials being light-transmitting, e.g. transparent, translucent
- H05K9/0096—Shielding materials being light-transmitting, e.g. transparent, translucent for television displays, e.g. plasma display panel
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Conductive Materials (AREA)
- Manufacturing Of Electric Cables (AREA)
- Non-Insulated Conductors (AREA)
Abstract
Description
本発明は、導電性ペースト、および透光性導電フィルムとその製造方法に関する。さらに詳しくは、CRT(ブラウン管)、PDP(プラズマディスプレイパネル)、EL(エレクトロルミネッセンス)パネルなどのディスプレイ前面から発生する電磁波を遮断するディスプレイ用電磁波シールドフィルタとして有用な透光性導電フィルムの製造に好適な導電性ペーストに関する。 The present invention relates to a conductive paste, a translucent conductive film, and a manufacturing method thereof. More specifically, it is suitable for the production of a translucent conductive film useful as an electromagnetic wave shielding filter for a display that blocks electromagnetic waves generated from the front surface of the display such as a CRT (CRT), PDP (Plasma Display Panel), EL (Electroluminescence) panel, etc. The present invention relates to a conductive paste.
従来は、ディスプレイと言うと、CRTディスプレイが代表的であったが、最近はこれに代わって、FPD(フラットパネルディスプレイ)が薄型テレビ等として普及が本格化している。FPDのなかでも、LCD(液晶ディスプレイ)とPDPが先駆的に普及しだしているが、今後は、これら以外にも更に、SED(Surface−conduction Electron−emitter Display)等として注目を集めるFED(フィールドエミッションディスプレイ)の普及も予想されている。 Conventionally, a display is typically a CRT display, but recently, an FPD (Flat Panel Display) has been widely used as a thin television or the like instead. Among FPDs, LCD (Liquid Crystal Display) and PDP are pioneering, but in addition to these, FED (Field-Electric-Emitter Display) and other FEDs that are attracting attention Emission displays are also expected to spread.
この様な各種ディスプレイにおいては、画素の駆動信号等から電磁波が発生するので、例えば上記のうちPDP、CRTで説明すれば、これらディスプレイから発生する電磁波をシールドするために、ディスプレイ前面に配置する電磁波シールドフィルタが知られている。このような用途に用いる電磁波シールドフィルタでは、電磁波シールド性能(導電性)と共に光透過性も要求される。 In such various displays, an electromagnetic wave is generated from a pixel drive signal or the like. For example, in the case of PDP and CRT among the above, an electromagnetic wave disposed on the front of the display to shield the electromagnetic wave generated from these displays. A shield filter is known. In the electromagnetic wave shielding filter used for such an application, light transmittance is required in addition to electromagnetic wave shielding performance (conductivity).
そこで、電磁波シールド性能(導電性)と光透過性を両立させるために、基材に樹脂フィルムやガラス等の透明基材を用い、この透明基材上に金属箔のエッチングや金属めっきによりメッシュ層を設けたディスプレイ用電磁波シールドフィルタが知られている。この金属層からなるメッシュ層は、その層自体が光透過性を有しないので、平面視形状が網目状となるようにパターン形成し多数の小さい穴(開口部)を設けることで、光透過性を確保している。ただし、メッシュがあまりに大きければ、目に付いてディスプレイ画像の邪魔になり、またメッシュの穴の総面積(開口率)が小さければ、やはりディスプレイ画像を邪魔して暗くなる。かと言って、メッシュを構成するラインを細くしすぎれば、メッシュの表面抵抗が増える上、断線等が生じ、本来のシールド性能を損ねてしまう。 Therefore, in order to achieve both electromagnetic shielding performance (conductivity) and light transmittance, a transparent base material such as a resin film or glass is used as the base material, and a mesh layer is formed on the transparent base material by etching a metal foil or metal plating. There is known an electromagnetic wave shielding filter for a display provided with. Since the mesh layer made of this metal layer itself does not have a light transmitting property, the light transmitting property can be obtained by forming a pattern so that the shape in plan view is a mesh shape and providing many small holes (openings). Is secured. However, if the mesh is too large, it will get in the way of the display image, and if the total area (opening ratio) of the mesh holes is small, the display image will also be disturbed and dark. However, if the lines that make up the mesh are made too thin, the surface resistance of the mesh increases and disconnection or the like occurs, impairing the original shielding performance.
ところで、従来、電磁波シールドフィルタにおける網目状の導電性パターン(導電性メッシュパターン)は、透明基材にラミネートされた銅箔をフォトエッチングして形成されるが、その面が光反射性であると外光等の不要光を反射し、透視画像の明室コントラストを低下させるので、通常、メッシュ層の層自体の面を黒化処理により黒くすることが行われている(例えば、特許文献1を参照)。このため、工程が煩雑となり、生産性やコストの点で問題を抱えている。 By the way, conventionally, the net-like conductive pattern (conductive mesh pattern) in the electromagnetic wave shielding filter is formed by photoetching a copper foil laminated on a transparent substrate, and the surface thereof is light reflective. Since unnecessary light such as outside light is reflected and the bright room contrast of the fluoroscopic image is reduced, the surface of the mesh layer itself is usually blackened by blackening treatment (for example, Patent Document 1). reference). For this reason, a process becomes complicated and has a problem in terms of productivity and cost.
生産性を向上する方法として、樹脂フィルムに導電性ペーストを印刷する方法も考案されているが(例えば、特許文献2を参照)、印刷適性と導電性の両立が困難なため、導電性を確保するためのめっき処理が必須となってしまい、工程の煩雑さは解消されていないのが現状である。 As a method for improving productivity, a method of printing a conductive paste on a resin film has also been devised (see, for example, Patent Document 2). However, it is difficult to achieve both printability and conductivity, thus ensuring conductivity. The present condition is that the plating process for doing so is indispensable, and the complexity of the process has not been eliminated.
すなわち、一般にポリマー型導電性ペーストと言われるものは、有機バインダーに導電粉末を分散したものを指すが、所望の導電性と印刷適性を発現させるためには導電粉末の選択、および導電粉末の配合比率が重要である。導電性を向上させるための最も効果的な態様としてフレーク状の銀粉末を多量に配合する方法がある。しかしながら、フレーク状の銀粉末を多量に配合すると、導電性ペーストのチキソ性が高くなりすぎてグラビア印刷法においては印刷適性が低下してしまうので、導電性メッシュパターンのような微細な線を形成する用途には適切ではない。一方、微細な線を形成するために、銀粉末の粒子を細かくし、且つ配合量を減少させる方法があるが、導電性ペースト中における導電粉末同士の接触が起こり難くなり電磁波遮蔽性を発揮する程の導電性を得ることができない。そのため、ポリマー型導電性ペーストの場合、導電性を確保するためのめっき処理などが必須であった。 That is, what is generally called a polymer-type conductive paste refers to a conductive powder dispersed in an organic binder, but in order to develop the desired conductivity and printability, the selection of the conductive powder and the blending of the conductive powder The ratio is important. As a most effective mode for improving conductivity, there is a method of blending a large amount of flaky silver powder. However, if a large amount of flaky silver powder is blended, the thixotropy of the conductive paste becomes too high and the printability in the gravure printing method is lowered, so a fine line such as a conductive mesh pattern is formed. Is not appropriate for the application On the other hand, in order to form fine lines, there is a method of making silver powder particles fine and reducing the blending amount. However, it is difficult for the conductive powders in the conductive paste to come into contact with each other, and electromagnetic shielding properties are exhibited. A degree of conductivity cannot be obtained. Therefore, in the case of a polymer type conductive paste, a plating process for ensuring conductivity is essential.
このように、電磁波シールド性能(導電性)と印刷適性を両立した、電磁波シールドフィルムを簡便・安価に製造し得る方法並びに該方法に適したポリマー型導電性ペーストは存在しないのが実情である。 As described above, there is actually no method for producing an electromagnetic wave shielding film that is compatible with electromagnetic wave shielding performance (conductivity) and printability, and a polymer type conductive paste suitable for the method.
本発明は、かかる実情に鑑みなされたものであり、電磁波シールド性能(導電性)と印刷適性を両立した、電磁波シールドフィルムを簡便・安価に製造し得るポリマー型導電性ペーストを提供することを目的とする。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a polymer-type conductive paste that is capable of easily and inexpensively producing an electromagnetic shielding film that has both electromagnetic shielding performance (conductivity) and printability. And
さて、ポリマー型導電性ペーストは、めっき処理等をすることなく導電性(電磁波シールド性能)を確保しようとすると、従来のグラフィックアーツ用インキに比べて粉体の配合割合を高くする必要がある。そのため、ペーストの乾燥が早まる傾向となり、その結果、印刷機などで印刷(転写)すると、インキ供給ロールでの乾燥や連続印刷過程での転移不良といった問題が発生し、特にグラビア印刷などの印刷適性(転写性)が低下することを突き止めた。
発明者は、この印刷適性の改善について鋭意研究した結果、印刷過程においてペーストの乾燥によるタック性の変化が印刷適性(転写性)に影響を及ぼすことを見出した。
さらに発明者は、このタック性に着目し、良好なタック性を維持するため、鋭意研究を行った結果、有機溶剤として高沸点溶剤を用いることで印刷適性(転写性)と導電性を両立した導電性ペーストを見出し、本発明を完成させるに至った。
Now, in order to ensure the conductivity (electromagnetic wave shielding performance) of the polymer-type conductive paste without performing a plating process or the like, it is necessary to increase the blending ratio of the powder as compared with the conventional graphic arts ink. As a result, drying of the paste tends to be accelerated, and as a result, when printing (transferring) with a printing press or the like, problems such as drying with an ink supply roll or transfer failure in a continuous printing process occur, and printing suitability such as gravure printing is particularly important. It was found that (transferability) was lowered.
As a result of intensive studies on the improvement of the printability, the inventor has found that a change in tackiness due to drying of the paste in the printing process affects the printability (transferability).
Furthermore, the inventor paid attention to this tackiness and conducted intensive research to maintain good tackiness. As a result, a high boiling point solvent was used as the organic solvent to achieve both printability (transferability) and conductivity. The present inventors have found a conductive paste and completed the present invention.
すなわち、本発明のグラビア印刷用導電性ペーストは、有機バインダー、導電粉末、着色剤および有機溶剤を含有する導電性ペーストにおいて、前記有機溶剤は、760mmHgおける沸点が240〜330℃の範囲である高沸点溶剤を含むことを特徴とする。 That is, the conductive paste for gravure printing of the present invention is a conductive paste containing an organic binder, a conductive powder, a colorant and an organic solvent. The organic solvent has a high boiling point in the range of 240 to 330 ° C. at 760 mmHg. It contains a boiling point solvent.
本発明において、前記有機溶剤は、前記高沸点溶剤を25〜100質量%の割合で含むこと好ましい。 In this invention, it is preferable that the said organic solvent contains the said high boiling point solvent in the ratio of 25-100 mass%.
本発明において、前記有機バインダーは、その数平均分子量が3000〜50000の範囲であることが印刷適性の点から好ましい。 In the present invention, the organic binder preferably has a number average molecular weight in the range of 3000 to 50000 from the viewpoint of printability.
本発明において、前記有機バインダー、導電粉末および着色剤の配合量が、質量基準において、
12≦(導電粉末の配合量+着色剤の配合量)/有機バインダーの配合量 ≦26
の関係を満たすことが導電性と印刷適性の両立の観点から好ましい。
In the present invention, the blending amount of the organic binder, conductive powder and colorant is based on mass,
12 ≦ (blending amount of conductive powder + blending amount of colorant) / blending amount of organic binder ≦ 26
It is preferable to satisfy this relationship from the viewpoint of achieving both conductivity and printability.
本発明において、ペーストのタック値が、5〜35の範囲であることが好ましい。 In this invention, it is preferable that the tack value of a paste is the range of 5-35.
また、本発明の透光性導電フィルムは、上述した導電性ペーストを用いて形成された網目状の導電性パターンを透明樹脂フィルム上に具備することを特徴とする。 Moreover, the translucent conductive film of the present invention is characterized by comprising a network-like conductive pattern formed using the above-described conductive paste on a transparent resin film.
さらに、本発明の透光性導電フィルムの製造方法は、上述した導電性ペーストを用いてグラビア印刷法にて透明樹脂フィルム上に網目状の導電性パターンを形成することを特徴とする。 Furthermore, the manufacturing method of the translucent conductive film of this invention forms a mesh-shaped electroconductive pattern on a transparent resin film by the gravure printing method using the electrically conductive paste mentioned above.
ここで、本発明において、タック値とは、ロータリータックメーター(一般名 インコメーター)を用い、30℃、400回転の条件における30秒後の測定値である。 Here, in the present invention, the tack value is a measured value after 30 seconds under conditions of 30 ° C. and 400 rotations using a rotary tack meter (generic name: incometer).
本発明によれば、電磁波シールド性能(導電性)と印刷適性を両立した、電磁波シールドフィルムを簡便・安価に製造し得る導電性ペーストを提供することができる。その結果、本発明の導電性ペーストを用いることにより、網目状パターンの線幅を細くし高開口率を維持しつつ高い電磁波遮蔽性と透明性(視認性)を有するディスプレイ用透光性導電フィルムを形成することができる。しかも、本発明の導電性ペーストは、印刷のみで充分な導電性を確保でき、さらに予め着色されているため、めっきや黒化処理などの後工程が不要となり、低コストで製造することが可能となった。加えて、高沸点溶剤を用いることで導電性ペーストの印刷時の乾燥を抑制し、印刷に適したタック性を維持できるため、良好な透光性導電フィルムを安定して提供することが可能となった。 ADVANTAGE OF THE INVENTION According to this invention, the electroconductive paste which can manufacture the electromagnetic wave shielding film which balanced electromagnetic wave shielding performance (electroconductivity) and printability easily and cheaply can be provided. As a result, by using the conductive paste of the present invention, a transparent conductive film for display having high electromagnetic shielding properties and transparency (visibility) while reducing the line width of the mesh pattern and maintaining a high aperture ratio. Can be formed. In addition, the conductive paste of the present invention can ensure sufficient conductivity only by printing and is pre-colored, so that post-processes such as plating and blackening treatment are not required and can be manufactured at low cost. It became. In addition, by using a high-boiling solvent, it is possible to suppress drying during printing of the conductive paste and maintain tackiness suitable for printing, so that it is possible to stably provide a good translucent conductive film. became.
以下、本発明の導電性ペーストについて説明する。
本発明の導電性ペーストを構成する有機バインダーは、乾燥、硬化した後も塗膜に残存し、密着性や耐屈曲性、硬度などの諸物性を付与したり、さらには印刷性を付与したりするために必要な重要な成分である。このような有機バインダーとしては、ペーストに印刷性を付与できるものであれば限定されるものではなく、例えば、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樹脂などの各種変性ポリエステル樹脂、ポリエーテルウレタン樹脂、ポリカーボネートウレタン樹脂、アクリルウレタン樹脂、塩化ビニル・酢酸ビニル共重合体、エポキシ樹脂、フェノール樹脂、アクリル樹脂、ポリビニルブチラール樹脂、ポリアミドイミド、ポリイミド、ポリアミド、ニトロセルロース、セルロース・アセテート・ブチレート(CAB)、セルロース・アセテート・プロピオネート(CAP)などの変性セルロース類などが挙げられる。
Hereinafter, the conductive paste of the present invention will be described.
The organic binder constituting the conductive paste of the present invention remains in the coating film after drying and curing, imparts various physical properties such as adhesion, flex resistance, hardness, and further imparts printability. It is an important ingredient necessary to do. Such an organic binder is not limited as long as it can impart printability to the paste. For example, various modified polyesters such as a polyester resin, a urethane-modified polyester resin, an epoxy-modified polyester resin, and an acrylic-modified polyester resin. Resin, polyether urethane resin, polycarbonate urethane resin, acrylic urethane resin, vinyl chloride / vinyl acetate copolymer, epoxy resin, phenol resin, acrylic resin, polyvinyl butyral resin, polyamideimide, polyimide, polyamide, nitrocellulose, cellulose acetate -Modified celluloses, such as a butyrate (CAB) and a cellulose acetate propionate (CAP), etc. are mentioned.
このうち、基材に樹脂フィルムを用いる場合は、耐屈曲性と基材に対する密着性の面から、ポリエステル樹脂、アクリル樹脂、ポリビニルブチラール樹脂、変性ポリエステル樹脂、塩化ビニル・酢酸ビニル共重合体、共重合ポリエステル樹脂などが好ましい。 Among these, when a resin film is used for the substrate, polyester resin, acrylic resin, polyvinyl butyral resin, modified polyester resin, vinyl chloride / vinyl acetate copolymer, copolymer are used from the viewpoint of flex resistance and adhesion to the substrate. Polymerized polyester resin and the like are preferable.
有機バインダーとして更に具体的には、数平均分子量(Mn)が3000〜50000、より好ましくは5000〜30000の範囲のものを用いるのが好適である。数平均分子量が3000未満であると、印刷時の転移不良が発生し易くなり良好な導電パターンの形成が困難となるので好ましくない。一方、数平均分子量が50000を超えると印刷時にペーストの糸引きに起因するヒゲ欠陥やラインのうねり等が発生し易くなり印刷適性を損なうので好ましくない。なお、数平均分子量は、ゲルパーメーションクロマトグラフィー(GPC)にて測定した標準ポリスチレン換算の値である。 More specifically, an organic binder having a number average molecular weight (Mn) of 3000 to 50000, more preferably 5000 to 30000 is preferably used. If the number average molecular weight is less than 3000, transfer defects are likely to occur during printing, and it becomes difficult to form a good conductive pattern. On the other hand, if the number average molecular weight exceeds 50,000, whisker defects or line waviness due to stringing of the paste is likely to occur during printing, and printability is impaired. The number average molecular weight is a standard polystyrene equivalent value measured by gel permeation chromatography (GPC).
本発明の導電性ペーストを構成する導電粉末としては、組成物において導電性を付与するものであればいかなるものでも用いることができる。このような導電粉末としては、Ag、Au、Pt、Pd、Ni、Cu、Al、Sn、Pb、Zn、Fe、Ir、Os、Rh、W、Mo、Ru等を挙げることができる。これらの導電粉末は、単体の形態で用いるものに限らず、合金や酸化物の形態でもよい。さらに、酸化錫(SnO2)、酸化インジウム(In2O3)、ITO(Indiumu Tin Oxide)などを用いることもできる。その形状としては、球状、フレーク状、デントライト状など種々の形状のものを用いることができるが、特に印刷適性や分散性を考慮すると球状のものを主体として用いることが好ましい。 As the conductive powder constituting the conductive paste of the present invention, any conductive powder can be used as long as it provides conductivity in the composition. Examples of such conductive powder include Ag, Au, Pt, Pd, Ni, Cu, Al, Sn, Pb, Zn, Fe, Ir, Os, Rh, W, Mo, Ru, and the like. These conductive powders are not limited to those used alone, but may be in the form of alloys or oxides. Further, tin oxide (SnO 2 ), indium oxide (In 2 O 3 ), ITO (Indium Tin Oxide), or the like can also be used. As the shape, various shapes such as a spherical shape, a flake shape, and a dentrite shape can be used. However, in consideration of printability and dispersibility, it is preferable to use a spherical shape as a main component.
導電粉末の好適な配合割合は、導電性ペーストの不揮発成分(乾燥工程でペースト中から揮発せず、膜に残存する成分)を基準として、85〜95質量%であり、より好ましくは90〜94質量%の範囲である。 A suitable blending ratio of the conductive powder is 85 to 95% by mass, more preferably 90 to 94%, based on the non-volatile component of the conductive paste (the component that does not evaporate from the paste in the drying step and remains in the film). It is the range of mass%.
導電粉末の好適な粒径は、球状の導電粉末を用いる場合、電子顕微鏡(SEM)を用いて10000倍にて観察したランダムな10個の導電粉末の平均粒径で、0.1〜5μm、好ましくは0.4〜2.0μmの大きさのものを用いることが好ましい。この平均粒径が0.1μm未満の場合、導電粉末同士の接触が起き難くなり導電性が低下する。一方、平均粒径が5μmを超える場合、印刷した際のラインエッジの直進性が得られ難くなるので好ましくない。なお、マイクロトラックによって測定した平均粒径では、0.5〜3.5μmの大きさのものを用いることが好ましい。 When the spherical conductive powder is used, the preferred particle size of the conductive powder is an average particle size of 10 random conductive powders observed at 10,000 times using an electron microscope (SEM), 0.1 to 5 μm, It is preferable to use one having a size of 0.4 to 2.0 μm. When this average particle diameter is less than 0.1 μm, it becomes difficult for the conductive powders to come into contact with each other and the conductivity is lowered. On the other hand, when the average particle diameter exceeds 5 μm, it is difficult to obtain straightness of the line edge when printing, which is not preferable. In addition, it is preferable to use the thing of the magnitude | size of 0.5-3.5 micrometers in the average particle diameter measured with the micro track | truck.
また、フレーク状の導電粉末を用いる場合、電子顕微鏡(SEM)を用いて10000倍にて観察したランダムな10個の導電粉の平均粒径で、0.1〜10μm、好ましくは0.4〜5.0μmの大きさのものを用いることが好ましい。この平均粒径が0.1μm未満の場合、導電粉末同士の接触が起き難くなり導電性が低下する。一方、平均粒径が10μmを超える場合、印刷した際のラインエッジの直進性が得られ難くなるので好ましくない。なお、マイクロトラックによって測定した平均粒径では、0.5〜7.0μmの大きさのものを用いることが好ましい。 Moreover, when using flaky conductive powder, it is an average particle diameter of 10 random conductive powders observed at 10,000 times using an electron microscope (SEM), and is 0.1 to 10 μm, preferably 0.4 to It is preferable to use one having a size of 5.0 μm. When this average particle diameter is less than 0.1 μm, it becomes difficult for the conductive powders to come into contact with each other and the conductivity is lowered. On the other hand, when the average particle diameter exceeds 10 μm, it is not preferable because it is difficult to obtain straightness of the line edge when printing. In addition, it is preferable to use the thing of the magnitude | size of 0.5-7.0 micrometers in the average particle diameter measured with the micro track | truck.
このような、導電粉末としては銀粉末が好ましく、その場合、銀粉末は、比表面積が0.01〜2.0m2/g、好ましくは0.5〜1.5m2/gのものを用いることが好ましい。この比表面積が0.01m2/g未満の場合、保存時に沈降を引き起こし易く、一方、比表面積が2.0m2/gを超える場合、吸油量が大きくなってペーストの流動性が損なわれるため好ましくない。 Such, preferably silver powder as conductive powder, in which case the silver powder has a specific surface area 0.01~2.0m 2 / g, preferably used as a 0.5 to 1.5 m 2 / g It is preferable. When this specific surface area is less than 0.01 m 2 / g, sedimentation is likely to occur during storage. On the other hand, when the specific surface area exceeds 2.0 m 2 / g, the oil absorption increases and the fluidity of the paste is impaired. It is not preferable.
本発明の導電性ペーストを構成する着色剤は、導電性ペーストを着色しディスプレイの視認性を向上させる目的で使用する。その種類や形状においては特に制限はなく、公知慣用のものが使用可能である。着色剤の色は、ディスプレイ用途として外光反射を抑制するのに充分な明度の低下をもたらすために好適な色であれば、いかなるものも使用可能であるが、好ましくは青、黒、3色混合による黒などが挙げられる。特に黒色が好適であり、カーボンブラック、ソルベントブラック、オイルブラックなどが用いることができるが、入手の容易さなどから色材用カーボンブラックが適している。例えば、カーボンブラックとしては、チャンネルブラック、ファーネスブラック、あるいはランプブラックなどの色材用カーボンブラック、および導電性カーボンブラック、アセチレンブラックなどが挙げられる。 The colorant constituting the conductive paste of the present invention is used for the purpose of coloring the conductive paste and improving the visibility of the display. There is no restriction | limiting in particular in the kind and shape, A well-known and usual thing can be used. Any colorant can be used as long as the colorant is suitable for display use in order to bring about a decrease in brightness sufficient to suppress external light reflection, but preferably blue, black, three colors. For example, black by mixing. In particular, black is preferable, and carbon black, solvent black, oil black, and the like can be used. However, carbon black for coloring material is suitable because of its availability. Examples of carbon black include carbon black for color materials such as channel black, furnace black, and lamp black, and conductive carbon black and acetylene black.
このような着色剤の配合量は、目的とする明度に着色可能であればいかなる配合量でも構わないが、有機バインダー100質量部に対して、5〜100質量部が好ましく、10〜80質量部がより好ましい。また、着色剤は、粉体、分散液、いずれの形態で用いても構わない。 The blending amount of such a colorant may be any blending amount as long as the target brightness can be colored, but is preferably 5 to 100 parts by weight, and 10 to 80 parts by weight with respect to 100 parts by weight of the organic binder. Is more preferable. The colorant may be used in any form of powder or dispersion.
着色剤の配合量が5質量部未満の場合は、ペーストの明度が高くなり、ディスプレイの視認性が悪化するので好ましくない。一方、100質量部を超えて多量に配合しても、著しい粘度の上昇やチキソ性が高くなりすぎる等の問題が生じるので好ましくない。 When the blending amount of the colorant is less than 5 parts by mass, the brightness of the paste becomes high and the visibility of the display deteriorates, which is not preferable. On the other hand, blending in a large amount exceeding 100 parts by mass is not preferable because problems such as a marked increase in viscosity and too high thixotropy occur.
本発明の導電性ペーストを構成する有機溶剤は、導電性ペーストのタック性を維持し、良好な印刷適性を付与するために必要な成分である。このような有機溶剤としては、760mmHgにおける沸点が240〜330℃の範囲である高沸点溶剤を含むことが必要であり、好ましくは有機溶剤中に前記高沸点溶剤を25〜100質量%の割合で含む。より好ましくは、35〜100質量%の割合で含む。高沸点溶剤の割合が25質量%未満では、ペーストの乾燥が速すぎて印刷過程での乾燥が起きてしまい、良好な印刷(転写)を行うことが困難となるので好ましくない。なお、高沸点溶剤を配合することで、めっき処理等をすることなく導電性(電磁波シールド性能)を確保することが可能となった。 The organic solvent constituting the conductive paste of the present invention is a component necessary for maintaining the tackiness of the conductive paste and imparting good printability. As such an organic solvent, it is necessary to include a high-boiling solvent having a boiling point in the range of 240 to 330 ° C. at 760 mmHg, and preferably the high-boiling solvent is contained in the organic solvent in a proportion of 25 to 100% by mass. Including. More preferably, it is contained at a ratio of 35 to 100% by mass. If the proportion of the high-boiling solvent is less than 25% by mass, the paste is dried too quickly, resulting in drying during the printing process, making it difficult to perform good printing (transfer), which is not preferable. In addition, it became possible to ensure electroconductivity (electromagnetic wave shielding performance), without performing a plating process etc. by mix | blending a high boiling point solvent.
このような高沸点溶剤としては、ジアミルベンゼン(沸点 260〜280℃)、トリアミルベンゼン(沸点 300〜320℃)、n−ドデカノール(沸点 255〜259℃)、ジエチレングリコール(沸点 245℃)、ジエチレングリコールモノブチルエーテルアセテート(沸点 247℃)、ジエチレングリコールジブチルエーテル(沸点 255℃)、ジエチレングリコールモノアセテート(沸点 250℃)、トリエチレングリコール(沸点 276℃)、トリエチレングリコールモノメチルエーテル(沸点 249℃)、トリエチレングリコールモノエチルエーテル(沸点 256℃)、トリエチレングリコールモノブチルエーテル(沸点 271℃)、テトラエチレングリコール(沸点 327℃)、テトラエチレングリコールモノブチルエーテル(沸点 304℃)、トリプロピレングリコール(沸点 267℃)、トリプロピレングリコールモノメチルエーテル(沸点 243℃)、2,2,4−トリメチル−1,3−ペンタンジオールモノイソブチレート(沸点 253℃)などが挙げられる。また、石油系炭化水素類としては、新日本石油(株)製のAFソルベント4号(沸点 240〜265℃)、5号(沸点=275〜306℃)、6号(沸点 296〜317℃)、7号(沸点 259〜282℃)、および0号ソルベントH(沸点 245〜265℃)なども挙げられ、必要に応じてそれらの2種以上が含まれてもよい。 Such high-boiling solvents include diamylbenzene (boiling point 260-280 ° C), triamylbenzene (boiling point 300-320 ° C), n-dodecanol (boiling point 255-259 ° C), diethylene glycol (boiling point 245 ° C), diethylene glycol. Monobutyl ether acetate (boiling point 247 ° C), diethylene glycol dibutyl ether (boiling point 255 ° C), diethylene glycol monoacetate (boiling point 250 ° C), triethylene glycol (boiling point 276 ° C), triethylene glycol monomethyl ether (boiling point 249 ° C), triethylene glycol Monoethyl ether (boiling point 256 ° C.), triethylene glycol monobutyl ether (boiling point 271 ° C.), tetraethylene glycol (boiling point 327 ° C.), tetraethylene glycol Butyl ether (boiling point 304 ° C.), tripropylene glycol (boiling point 267 ° C.), tripropylene glycol monomethyl ether (boiling point 243 ° C.), 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (boiling point 253 ° C.) Etc. Also, as petroleum hydrocarbons, AF Solvent No. 4 (boiling point: 240-265 ° C.), No. 5 (boiling point = 275-306 ° C.), No. 6 (boiling point: 296-317 ° C.) manufactured by Nippon Oil Corporation , No. 7 (boiling point 259-282 ° C.), No. 0 solvent H (boiling point 245-265 ° C.), etc., and two or more of them may be included as necessary.
このうち、有機バインダーの溶解性や沸点などの観点から、トリエチレングリコール誘導体またはトリプロピレングリコール誘導体が好適に用いられる。 Among these, from the viewpoints of solubility and boiling point of the organic binder, a triethylene glycol derivative or a tripropylene glycol derivative is preferably used.
なお、上述した高沸点溶剤以外の有機溶剤としては、有機バインダーを溶解できるものであれば公知慣用のものが使用可能である。例えば、トルエン、キシレン、酢酸エチル、酢酸ブチル、メタノール、エタノール、イソプロピルアルコール、イソブチルアルコール、1−ブタノール、ジアセトンアルコール、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メチルエーテルアセテート、テルピネオール、メチルエチルケトン、カルビトール、カルビトールアセテート、ブチルカルビトール、等が挙げられ、必要に応じてそれらの2種以上が含まれてもよい。 In addition, as an organic solvent other than the high boiling point solvent described above, a known and conventional one can be used as long as it can dissolve the organic binder. For example, toluene, xylene, ethyl acetate, butyl acetate, methanol, ethanol, isopropyl alcohol, isobutyl alcohol, 1-butanol, diacetone alcohol, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monomethyl ether Examples include acetate, terpineol, methyl ethyl ketone, carbitol, carbitol acetate, butyl carbitol, and the like, and two or more of them may be included as necessary.
このような高沸点溶剤を含む有機溶剤の配合量は、グラビア印刷に適切なペースト粘度、例えば、50〜1000dPa・s、より好ましくは100〜750dPa・sとなるように調整する。導電性ペーストの粘度が50dPa・s未満では、印刷されたパターンの膜厚が薄くなり易く、得られた導電パターンの表面抵抗が高くなるので好ましくない。一方、粘度が1000dPa・sを超えると、グラビア印刷時にドクターブレードでのペーストのかきとりができ難くなり、地汚れ(非画線部へのペーストの付着)やにじみなどの印刷不良が起こりやすくなるため好ましくない。なお、本発明におけるペーストの粘度は、コーンプレート型粘度計を用い、剪断速度が10s−1、25℃の条件にて測定した値である。 The compounding quantity of the organic solvent containing such a high boiling point solvent is adjusted so that it may become paste viscosity suitable for gravure printing, for example, 50-1000 dPa * s, More preferably, it is 100-750 dPa * s. If the viscosity of the conductive paste is less than 50 dPa · s, the thickness of the printed pattern tends to be thin, and the surface resistance of the obtained conductive pattern becomes high, which is not preferable. On the other hand, when the viscosity exceeds 1000 dPa · s, it becomes difficult to scrape off the paste with a doctor blade during gravure printing, and printing defects such as background stains (adhesion of paste on non-image areas) and bleeding are likely to occur. It is not preferable. The viscosity of the paste in the present invention is a value measured using a cone plate viscometer under conditions of a shear rate of 10 s-1 and 25 ° C.
以上説明した導電性ペーストにおいて、より優れた印刷適性と導電性を得るためには、前記有機バインダー、導電粉末および着色剤の配合量が、質量基準において、
12≦(導電粉末の配合量+着色剤の配合量)/有機バインダーの配合量≦26
の関係を満たすことが好ましく、
13≦(導電粉末の配合量+着色剤の配合量)/有機バインダーの配合量≦21
の関係を満たすことがより好ましい。
In the conductive paste described above, in order to obtain better printability and conductivity, the blending amount of the organic binder, conductive powder and colorant is based on mass,
12 ≦ (blending amount of conductive powder + blending amount of colorant) / blending amount of organic binder ≦ 26
It is preferable to satisfy the relationship
13 ≦ (blending amount of conductive powder + blending amount of colorant) / blending amount of organic binder ≦ 21
It is more preferable to satisfy this relationship.
良好な印刷適性をもたらすためには、ペーストのタック値を適切な範囲とすることも重要である。本発明の導電性ペーストのタック値は、好ましくは5〜35であり、より好ましくは10〜30の範囲である。タック値が5未満であると印刷時にペーストの転移性が劣り印刷品質を悪化させ、印刷後の膜厚が薄くなり表面抵抗が高くなる傾向があるため好ましくない。一方、タック値が35を超えると、印刷時に被印刷物のピッキング(被印刷物の破れ)やジャム(被印刷物が印刷機に詰まる)が起こり易くなるため好ましくない。 In order to provide good printability, it is also important to set the tack value of the paste within an appropriate range. The tack value of the conductive paste of the present invention is preferably 5 to 35, more preferably 10 to 30. A tack value of less than 5 is not preferable because the transferability of the paste is inferior at the time of printing, the printing quality is deteriorated, the film thickness after printing tends to be thin, and the surface resistance tends to be high. On the other hand, if the tack value exceeds 35, picking of the printed material (breaking of the printed material) and jamming (the printed material clogs the printing machine) are likely to occur during printing.
また、本発明の導電性ペーストには、印刷適性を損なわない範囲で、架橋剤、金属分散剤、チクソトロピー付与剤、消泡剤、レベリング剤、表面張力低下剤、希釈剤、可塑化剤、酸化防止剤、金属不活性化剤、カップリング剤や充填剤などの添加剤を配合してもよい。 In addition, the conductive paste of the present invention includes a crosslinking agent, a metal dispersant, a thixotropy imparting agent, an antifoaming agent, a leveling agent, a surface tension reducing agent, a diluent, a plasticizer, and an oxidation, as long as printability is not impaired. You may mix | blend additives, such as an inhibitor, a metal deactivator, a coupling agent, and a filler.
本発明の透光性導電フィルムは、以上詳述した本発明の導電性ペーストを、樹脂フィルムなどの透明基材上にグラビア印刷して網目状の導電性パターンを形成し、これを乾燥・硬化して得られるものである。本発明の導電性ペーストを用いることにより、めっき処理を施すことなく十分な導電性が付与され、優れた電磁波遮蔽性能を有する透光性導電フィルムを提供することができる。 The translucent conductive film of the present invention is a gravure-printed conductive paste of the present invention described above in detail on a transparent substrate such as a resin film to form a network-like conductive pattern, which is then dried and cured Is obtained. By using the conductive paste of the present invention, it is possible to provide a translucent conductive film having sufficient conductivity without performing plating treatment and having excellent electromagnetic wave shielding performance.
ここで、上記透明基材である樹脂フィルムとしては、例えば、ポリエステル樹脂、アクリル樹脂、ポリカーボネート樹脂、ポリエーテルスルホン樹脂、ポリプロピレン樹脂、トリアセチルセルロース樹脂、ジシクロペンタジエン樹脂、ノルボルネン樹脂、ウレタン樹脂などからなる樹脂フィルムが挙げられる。フィルムの表面には、必要に応じて、ハードコート層、易接着層、離形処理層、導電性ポリマー層、インキ受容層などが設けられてもよいし、また、プラズマ処理などが施されていてもよい。フィルムの厚みは通常20〜800μmである。 Here, as the resin film as the transparent substrate, for example, polyester resin, acrylic resin, polycarbonate resin, polyethersulfone resin, polypropylene resin, triacetylcellulose resin, dicyclopentadiene resin, norbornene resin, urethane resin, etc. The resin film which becomes is mentioned. If necessary, the surface of the film may be provided with a hard coat layer, an easy-adhesion layer, a release treatment layer, a conductive polymer layer, an ink receiving layer, etc., or a plasma treatment or the like. May be. The thickness of the film is usually 20 to 800 μm.
また、グラビア印刷のような凹版印刷に用いる版は、銅、42アロイ、ガラスなどからなるシリンダーや平版の表面に対して、写真製版やレーザー彫刻等を施して製版される。必要に応じて、クロームめっき処理やDLC(ダイヤモンド・ライク・カーボン)処理を施し凹版の耐久性を向上させてもよい。 In addition, a plate used for intaglio printing such as gravure printing is made by subjecting the surface of a cylinder or planographic plate made of copper, 42 alloy, glass, or the like to photolithography or laser engraving. If necessary, the durability of the intaglio may be improved by performing a chrome plating process or a DLC (diamond-like carbon) process.
本発明において、網目状の導電性パターンとは、三角形、四角形、五角形、その他のN角形(Nは6以上の整数)などの格子状であってもよく、丸型、葉型などのパターンでもよいし、不定形でもよい。一方、このパターンの線幅は、10〜80μm、好ましくは10〜40μmであり、また、このパターンの線間隔は、100〜500μm、好ましくは125〜500μmである。線幅や線間隔をあまり大きくすると、得られる透光性導電フィルムの導電性パターンが目に付きやすくなり、ディスプレイの前面板として用いたときに、画面の視認性が低下する傾向がある。また、線間隔をあまり小さくすると、得られる透光性導電フィルムの導電パターンが細かくなって(単位面積あたりの線の本数が多くなる)、可視光線の透過率が低下し、ディスプレイ前面板として用いたときに、画面が暗くなる傾向にある。なお、線幅が小さいほど、均一なパターンの形成が困難になる傾向にあるので、上記のように10μm以上であるのが適当である。 In the present invention, the mesh-like conductive pattern may be a lattice shape such as a triangle, a quadrangle, a pentagon, and other N-gons (N is an integer of 6 or more), or a pattern such as a round shape or a leaf shape. It may be good or irregular. On the other hand, the line width of this pattern is 10 to 80 μm, preferably 10 to 40 μm, and the line spacing of this pattern is 100 to 500 μm, preferably 125 to 500 μm. When the line width and the line interval are too large, the conductive pattern of the obtained translucent conductive film is easily noticeable, and when used as a front plate of a display, the visibility of the screen tends to be lowered. In addition, if the line spacing is too small, the conductive pattern of the resulting translucent conductive film becomes fine (the number of lines per unit area increases), the visible light transmittance decreases, and it is used as a display front plate. The screen tends to darken. In addition, since it tends to be difficult to form a uniform pattern as the line width is smaller, it is appropriately 10 μm or more as described above.
なお、本発明の導電性ペーストは予め着色しているため、黒化処理が不要であり印刷・乾燥(または硬化)のみで導電性に優れた透光性導電フィルムを得ることができ、該フィルムは電磁波シールドなどの用途として好適に用いることが可能である。 In addition, since the conductive paste of the present invention is colored in advance, a blackening treatment is unnecessary, and a light-transmitting conductive film excellent in conductivity can be obtained only by printing / drying (or curing). Can be suitably used for applications such as electromagnetic shielding.
このようにして製造された透光性導電フィルムは、必要に応じて、反射防止処理、色補正のための着色処理、近赤外線吸収処理などの後処理が施されてもよい。この場合、プラズマディスプレイの前面板の用途として好適である。また、ディスプレイに貼付けるための粘着剤が透光性導電フィルムにラミネートされていてもよい。 The translucent conductive film thus produced may be subjected to post-treatment such as antireflection treatment, coloring treatment for color correction, and near infrared absorption treatment, if necessary. In this case, it is suitable as an application of the front plate of the plasma display. Moreover, the adhesive for affixing on a display may be laminated | stacked on the translucent conductive film.
以下、実施例および比較例を示して本発明についてより具体的に説明するが、以下の実施例は本発明の例示のためのみであり、本発明を限定するものではない。なお、以下において「部」とあるのは、特に断りのない限り全て「質量部」を示す。 EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, the following Examples are only for the illustration of this invention and do not limit this invention. In the following description, “part” means “part by mass” unless otherwise specified.
(実施例1〜6、および比較例1〜2)
表1に示す配合割合で各成分を配合し、3本ロールミルにて練肉して導電性ペーストを得た。なお、練肉後は有機溶剤にて粘度を500dPa・sに調整してから評価に使用した。
Each component was mix | blended with the compounding ratio shown in Table 1, and it kneaded with the 3 roll mill, and obtained the electrically conductive paste. After kneading, the viscosity was adjusted to 500 dPa · s with an organic solvent and used for evaluation.
このようにして得られた各種導電性ペーストについて、導電性、印刷性、耐乾燥性およびタック値について評価した。評価方法は以下の通りである。 The various conductive pastes thus obtained were evaluated for conductivity, printability, drying resistance, and tack value. The evaluation method is as follows.
(1)導電性の評価
得られた各種導電性ペーストをガラス基板上にパターン印刷し、0.5cm×10cmのパターンを形成し、120℃×30分にて加熱処理し、0.5cm×10cmの導電性パターンを形成した。この導電性パターンについて、ミリオームハイテスイターを用いた四端子法にてシート抵抗値を測定し、そのシート測定値と膜厚とから比抵抗値を算出し、導電性を評価した。
(1) Conductivity evaluation The obtained various conductive pastes are pattern-printed on a glass substrate to form a pattern of 0.5 cm × 10 cm, heat-treated at 120 ° C. × 30 minutes, and 0.5 cm × 10 cm. The conductive pattern was formed. With respect to this conductive pattern, the sheet resistance value was measured by a four-terminal method using a milliohm high-teeter, and the specific resistance value was calculated from the sheet measurement value and the film thickness to evaluate the conductivity.
(2)印刷性の評価
得られた各種導電性ペーストを、ポリエステルフィルム(東洋紡製、コスモシャインA4300、100μm厚)上にグラビア印刷にて印刷し、120℃×30分間にて加熱処理を行い、格子状の導電性パターンを形成した透光性導電フィルムを作製した。ここで、グラビア印刷に用いたクロームめっき凹版は、線幅20μmで版深10μm、ピッチ300μmの格子パターンが形成されたものである。
このようにして作製した透光性導電フィルムについて、格子状の導電性パターンを観察し、地汚れ(非画線部へのペーストの付着)、ヒゲ欠陥、かすれの有無を確認し印刷性を評価した。評価基準は以下の通りである。
○:地汚れ、ヒゲ欠陥、かすれが全くないもの
△:地汚れ、ヒゲ欠陥、かすれがわずかに観察されたもの
×:地汚れ、ヒゲ欠陥、かすれが全面にわたり観察されたもの
また、各種導電性ペーストのタック値を測定し、印刷性とタック値との関係を評価した。この導電性ペーストのタック値は、ロータリータックメーター(東洋精機製作所製 製品名:デジタルインコメーター)を用い、30℃にて回転数を400rpm×30秒後の条件にて測定した。
(2) Evaluation of printability Various conductive pastes obtained were printed on a polyester film (Toyobo Cosmo Shine A4300, 100 μm thickness) by gravure printing, and heat-treated at 120 ° C. for 30 minutes. A translucent conductive film having a grid-like conductive pattern was produced. Here, the chrome plating intaglio used for gravure printing is one in which a lattice pattern having a line width of 20 μm, a plate depth of 10 μm, and a pitch of 300 μm is formed.
For the translucent conductive film thus produced, the grid-like conductive pattern was observed, and the printability was evaluated by checking for the presence of ground stains (adhesion of paste on non-image areas), whiskers, and blurring. did. The evaluation criteria are as follows.
○: No soiling, mustache defects, or fading △: Slightly observed soiling, mustache defects, or faint ×: Observed soiling, mustache defects, or fading over the entire surface The tack value of the paste was measured and the relationship between printability and tack value was evaluated. The tack value of this conductive paste was measured using a rotary tack meter (product name: Digital Incometer, manufactured by Toyo Seiki Seisakusho) at 30 ° C. under the condition of a rotation speed of 400 rpm × 30 seconds.
(3)転写性の評価
得られた導電性ペーストを、線幅20μmで版深10μm、ピッチ300μmの格子パターンが形成されたクロームめっき凹版の画線部に充填し、2分間放置した。その後、ポリエステルフィルムをペーストが充填された凹版に押し付けペーストをポリエステルフィルム上に転写させ、120℃×30分間乾燥を行い、導電性ペーストの転写性に関する経時安定性を評価した。評価基準は以下の通りである。
○:パターンが全て転写され、凹版の画線が良好に再現されているもの。
△:パターンの一部が転写されず、部分的に断線や欠けが確認されたもの。
×:パターンが全く転写されず、画線の形成ができなかったもの。
(3) Evaluation of transferability The obtained conductive paste was filled into an image line portion of a chrome-plated intaglio plate on which a grid pattern having a line width of 20 μm, a plate depth of 10 μm, and a pitch of 300 μm was formed, and left for 2 minutes. Thereafter, the polyester film was pressed against the intaglio plate filled with the paste, the paste was transferred onto the polyester film, dried at 120 ° C. for 30 minutes, and the temporal stability with respect to the transferability of the conductive paste was evaluated. The evaluation criteria are as follows.
○: The pattern is completely transferred, and the intaglio image line is well reproduced.
Δ: A part of the pattern was not transferred, and disconnection or chipping was partially confirmed.
X: The pattern was not transferred at all and the image line could not be formed.
これらの結果を表2に示す。この表2に示す結果から明らかなように、本発明の導電性ペーストによれば、導電性と印刷性(転写性)を両立した、電磁波シールドフィルムを簡便・安価に製造し得る導電性ペーストを提供できることがわかる。さらに、本発明の導電性ペーストは、転写性に関する経時安定性に優れるため、グラビア印刷において、品質の安定化に寄与するものと考えられる。 These results are shown in Table 2. As is apparent from the results shown in Table 2, according to the conductive paste of the present invention, a conductive paste that can easily and inexpensively produce an electromagnetic wave shielding film having both conductivity and printability (transferability) is provided. You can see that it can be provided. Furthermore, since the conductive paste of the present invention is excellent in stability over time with respect to transferability, it is considered that it contributes to quality stabilization in gravure printing.
また、実施例1、2、6および比較例2に記載の導電性ペーストついて、経時的なタック値を測定し、その変化をグラフ化した。そのグラフを図1および図2に示す。この図1および図2に示す結果からも明らかなように、実施例にかかる導電性ペーストは、タック値が5以上を維持できる時間が60秒以上と長く、比較例の導電性ペーストに比べて転写性に関する経時安定性に優れる。 For the conductive pastes described in Examples 1, 2, 6 and Comparative Example 2, the tack value over time was measured, and the change was graphed. The graphs are shown in FIGS. As can be seen from the results shown in FIGS. 1 and 2, the conductive paste according to the example has a long tack time of 60 seconds or more, which is able to maintain the tack value of 5 or more, compared with the conductive paste of the comparative example. Excellent stability over time with respect to transferability.
Claims (8)
12≦(導電粉末の配合量+着色剤の配合量)/有機バインダーの配合量 ≦26
の関係を満たすことを特徴とする請求項1乃至3のいずれか1項に記載の導電性ペースト。 The blending amount of the organic binder, conductive powder and colorant is based on mass,
12 ≦ (blending amount of conductive powder + blending amount of colorant) / blending amount of organic binder ≦ 26
The conductive paste according to claim 1, wherein the relationship is satisfied.
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