WO2022054640A1 - 有機導電フィルムの製造方法、有機導電フィルム及び積層体 - Google Patents
有機導電フィルムの製造方法、有機導電フィルム及び積層体 Download PDFInfo
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/12—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances organic substances
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- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
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- H01B1/124—Intrinsically conductive polymers
- H01B1/127—Intrinsically conductive polymers comprising five-membered aromatic rings in the main chain, e.g. polypyrroles, polythiophenes
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- C08G2261/30—Monomer units or repeat units incorporating structural elements in the main chain
- C08G2261/32—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain
- C08G2261/322—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed
- C08G2261/3223—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed containing one or more sulfur atoms as the only heteroatom, e.g. thiophene
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- C08G2261/79—Post-treatment doping
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
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- H10K85/1135—Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
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Definitions
- the present disclosure relates to a method for producing an organic conductive film, an organic conductive film and a laminate.
- ITO indium tin oxide laminated on a film
- ITO indium tin oxide
- indium which is an ITO material
- organic materials are being studied. Examples of such an organic material include ⁇ -conjugated conductive polymers, and specific examples thereof include polythiophene-based conductive polymers.
- the solution containing an acid-based organic conductive polymer may show strong acidity due to its composition.
- the conductive polymer layer formed by using the solution whose pH is adjusted is not sufficient in light resistance.
- the present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a method for producing an organic conductive film having excellent light resistance.
- the present disclosure also aims to provide an organic conductive film having excellent light resistance.
- the method for producing an organic conductive film includes a coating liquid containing an acid-based organic conductive polymer, an alkali neutralizing agent and a liquid medium, and having a pH of 4.0 to 6.5 at 25 ° C. It is provided with a step of preparing the coating liquid, a step of applying the coating liquid on the base material layer, and a step of removing the liquid medium from the applied coating liquid.
- the coating liquid whose pH is adjusted in this way, the cation content derived from the alkali neutralizer in the acid-based organic conductive polymer layer can be appropriately controlled as described later, resulting in light resistance. It is possible to produce an excellent organic conductive film.
- the pH is not too low, that is, the cation content derived from the alkali neutralizing agent is not too low. It was found to be important by the examination of the inventors.
- the acid-based organic conductive polymer may contain a polythiophene-based conductive polymer.
- the alkali neutralizing agent may contain aqueous ammonia.
- the organic conductive film according to one aspect of the present disclosure includes a base material layer and an acid-based organic conductive polymer layer on the base material layer, and is derived from an alkali neutralizing agent in the acid-based organic conductive polymer layer.
- the cation content is 0.5-5.0 mg / cm 3 .
- the acid-based organic conductive polymer may contain a polythiophene-based conductive polymer.
- the cation derived from the alkali neutralizing agent may contain ammonium ions.
- the base material layer may include a resin base material or a glass base material.
- the organic conductive film may be used as a resistance coating of an electromagnetic wave suppression sheet or a circuit material in an electronic device.
- an organic conductive film having excellent light resistance it is possible to provide a method for producing an organic conductive film having excellent light resistance. Further, according to the present disclosure, it is possible to provide an organic conductive film having excellent light resistance. Such an organic conductive film can be obtained by the above-mentioned manufacturing method.
- FIG. 1 is a schematic cross-sectional view of an organic conductive film according to an embodiment.
- FIG. 1 is a schematic cross-sectional view of an organic conductive film according to an embodiment.
- the organic conductive film 10 includes a base material layer 1 and an acid-based organic conductive polymer layer 2 on the base material layer 1.
- the base material layer functions as a base material of the organic conductive film.
- Examples of the material of the base material layer include resin and glass. That is, the base material layer may include a resin base material or a glass base material, and may be a resin base material or a glass base material.
- the resin is not particularly limited, and is, for example, a polyester resin such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate, modified polyester, polyethylene (PE) resin, polypropylene (PP) resin, cyclic olefin resin and the like.
- PET polyethylene terephthalate
- PBT polybutylene terephthalate
- PE polyethylene naphthalate
- modified polyester polyethylene
- PE polyethylene
- PP polypropylene
- PP polypropylene
- Polyolefin resin polyvinyl chloride
- vinyl resin such as polyvinylidene chloride
- polyvinyl acetal resin such as polyvinyl butyral (PVB)
- PEEK polyether ether ketone
- PSF polysulfone
- PES polyether sulfone
- the resin may be a polyester resin such as PET or PBT, or a polyolefin resin such as PP.
- the glass is not particularly limited, and examples thereof include soda-lime glass, lead glass, bromelic acid glass, and quartz glass.
- the glass may be soda-lime glass from the viewpoint of availability, price, and the like.
- the base material layer may include one layer formed from these materials, or may include a plurality of layers.
- the resin base materials may be used in combination, or the resin base material and the glass base material may be used in combination.
- Examples of the combination of the resin base materials include a PP layer / PET layer structure and a PP layer / PBT layer structure.
- the thickness of the base material layer is not particularly limited, but may be, for example, 10 to 200 ⁇ m, and may be 25 to 75 ⁇ m, from the viewpoint of transparency and strength according to the application. Further, from the viewpoint of coatability of the coating liquid, adhesion to the polymer layer, and the like, a corona treatment or an easy-adhesion treatment may be applied to the surface of the base material layer, if necessary.
- the base material layer may be transparent or opaque to electromagnetic waves having a wavelength in the visible light region, and is appropriately selected according to the specifications of the organic conductive film. For example, when the organic conductive film is required to be transparent to electromagnetic waves having a wavelength in the visible light region, a transparent base material layer may be selected. Further, when a pattern or a wood grain design is required for the base material, printing may be applied to the base material layer or unevenness may be formed on the surface of the base material layer.
- the acid-based organic conductive polymer layer has conductivity and contains an acid-based organic conductive polymer.
- the acid-based organic conductive polymer means a conductive composite containing a ⁇ -conjugated conductive polymer and a polyanion dopant for the ⁇ -conjugated conductive polymer in the present specification.
- the ⁇ -conjugated conductive polymer is not particularly limited, and examples thereof include polythiophene, polypyrrole, polyaniline, polyacetylene, polyphenylene vinylene, polynaphthalene, and derivatives thereof.
- the ⁇ -conjugated conductive polymer may be a polythiophene-based conductive polymer, in particular, from the viewpoint of transparency, conductivity, stability, and the like.
- polythiophene-based conductive polymer examples include polythiophene, poly (3-methylthiophene), poly (3-ethylthiophene), poly (3-propylthiophene), poly (3-butylthiophene), and poly (3-hexylthiophene).
- the polythiophene-based conductive polymer can be used alone or in combination of two or more.
- the acid-based organic conductive polymer layer contains a polyanion dopant for the ⁇ -conjugated conductive polymer. This makes it possible to improve the conductivity of the acid-based organic conductive polymer layer.
- the polyanionic dopant include alkane sulfonic acid, polystyrene sulfonic acid, polyvinyl sulfuric acid, polyvinyl sulfonic acid, polyallyl sulfonic acid, polyacrylic sulfonic acid, polymethacrylic sulfonic acid, and poly (2-acrylamide-2-methylpropanesulfonic acid).
- Polyisoprene sulfonic acid polysulfoethyl methacrylate, poly (4-sulfobutyl methacrylate), high molecular weight acid having a sulfo group such as polymethacryloxybenzene sulfonic acid, sulfo group such as p-toluene sulfonic acid, dodecylbenzene sulfonic acid.
- examples thereof include organic acids having a sulfonic acid.
- the polyanionic dopant may be polystyrene sulfonic acid from the viewpoint of chemical stability and conductivity.
- the polyanionic dopant can be used alone or in combination of two or more.
- the conductive composite is a composite of poly (3,4-ethylenedioxythiophene) (PEDOT) and polystyrene sulfonic acid (PSS), poly (3,4-). It may be ethylenedioxythiophene) -poly (styrene sulfonic acid) (PEDOT-PSS).
- the acid-based organic conductive polymer layer may contain other components (for example, a binder, etc.) other than the polythiophene-based conductive polymer and the polyanion dopant as long as the desired effect is not significantly impaired.
- the total amount of the polythiophene-based conductive polymer and the polyanion dopant in the acid-based organic conductive polymer layer can be 50% by mass or more, 80% by mass or more, and 90% by mass. That may be the above.
- the thickness of the acid-based organic conductive polymer layer is not particularly limited, but can be, for example, 10 nm to 1 ⁇ m, and may be 200 to 600 nm.
- the formation of the acid-based organic conductive polymer layer is based on a coating liquid containing an acid-based organic conductive polymer and an alkali neutralizing agent and having a pH of 4.0 to 6.5 at 25 ° C. It can be done by applying it on the layer.
- the cation content derived from the alkali neutralizing agent in the acid-based organic conductive polymer layer is 0.5 to 5.0 mg / cm 3 from the viewpoint of maintaining excellent light resistance, but 3.0 to 5. It may be 0 mg / cm 3 and may be 4.5 to 5.0 mg / cm 3 .
- the reason why the acid-based organic conductive polymer layer contains a certain amount or more of cations is that the cations are trapped by hydrogen bonds with the acid-based organic conductive polymer and remain in the layer even after the liquid medium is removed. I presume that this is to do.
- the cation content can be measured by an ion chromatograph. Specifically, the organic conductive film is put into an extraction solvent (ultrapure water) and allowed to stand in an environment of 25 ° C. for 24 hours. The extraction solvent after standing is diluted 50 times with ultrapure water, and then the cations are quantified by an ion chromatograph. Based on the quantification result, the content of cations remaining in the acid-based organic conductive polymer layer can be calculated.
- an extraction solvent ultrapure water
- the cations derived from the alkali neutralizer may contain ammonium ions.
- the amount of ammonium ions present in the acid-based organic conductive polymer layer can be 0.5 to 5.0 mg / cm 3 and 3.0 to 5.0 mg as measured by an ion chromatograph. It may be / cm3 and may be 4.5-5.0 mg / cm3 .
- the acid-based organic conductive polymer layer has excellent light resistance, which means that the surface resistance does not easily increase with time.
- the organic conductive film can be used as a resistance film of an electromagnetic wave suppression sheet or a circuit material in an electronic device, but this is not the case.
- the organic conductive film is used as an electromagnetic wave suppression sheet like the resistance coating layer described in Japanese Patent No. 6523563. Further, the organic conductive film is used as an electronic device like the hole transport layer described in JP-A-2005-71929.
- the electromagnetic wave suppression sheet is a laminated body including an organic conductive film, a dielectric layer, and an electromagnetic wave shielding layer.
- the method for manufacturing the electromagnetic wave suppression sheet is not particularly limited, and examples thereof include the following methods. (1) A method of adhering an organic conductive film to a laminate in which a dielectric layer and an electromagnetic wave shielding layer are laminated. (2) A method in which an acid-based organic conductive polymer layer is formed by coating on a laminate in which a dielectric layer and an electromagnetic wave shielding layer are laminated, and a base material layer is adhered thereto.
- the electromagnetic wave suppression sheet according to one side is formed by sequentially laminating a resistance coating, a dielectric layer, and an electromagnetic wave shielding layer, all of which have translucency, and the resistance coating is an acid-based organic conductive polymer layer.
- the resistance coating is an acid-based organic conductive polymer layer.
- the base material layer of the resistance film is opaque to electromagnetic waves in the visible light region (it may be completely opaque or incompletely opaque). May be.
- the dielectric layer is set to a layer thickness capable of absorbing electromagnetic waves in a high frequency band of 30 GHz to 300 GHz or higher
- the electromagnetic wave shielding layer is composed of a conductive mesh and is conductive.
- the opening ratio of the sex mesh is 35% or more and 85% or less, the total light transmittance is 30% or more, and the amount of electromagnetic wave attenuation in the electromagnetic wave suppression sheet is 20 dB or more.
- the surface resistance value of the electromagnetic wave shielding layer is 0.3 ⁇ / sq or less.
- the surface resistance value of the resistance film is in the range of -15% to + 20% with respect to the impedance of the vacuum.
- the coating liquid contains an alkali neutralizing agent in addition to the above-mentioned materials exemplified in the acid-based organic conductive polymer layer.
- the alkali neutralizing agent is not particularly limited as long as it can adjust the pH of the coating liquid and does not easily affect the composite state of the acid-based organic conductive polymer. Hydroxides, carbonates, ammonium compounds such as ammonia, amines and the like can be mentioned. From the viewpoint of availability, the alkali neutralizer may contain ammonia.
- the liquid solvent is not particularly limited, and examples thereof include water, an organic solvent, and a mixed solvent of water and an organic solvent.
- the pH of the coating liquid at 25 ° C. is 4.0 to 6.5. By adjusting the pH to this range, excellent light resistance can be imparted to the formed acid-based organic conductive polymer layer. From this point of view, the pH of the coating liquid may be 4.5 to 5.5.
- the method of applying the coating liquid on the substrate layer is not particularly limited, and for example, a gravure coat, a reverse roll coat, a die coat, an air doctor coat, a blade coat, a rod coat, a bar coat, a curtain coat, a knife coat, etc.
- Conventionally known coating methods such as transfer roll coat, squeeze coat, impregnation coat, kiss coat, spray coat, calendar coat, and extrusion coat can be mentioned.
- Examples of the method for removing the liquid medium include removal by heating, removal by decompression, and a combination thereof.
- the heating temperature can be, for example, 50 to 200 ° C, and may be 90 to 150 ° C.
- the heating time depends on the heating temperature, but can be, for example, 30 seconds to 15 minutes, and may be 1 to 5 minutes.
- Each coating liquid was applied to a polyethylene terephthalate substrate (PET, thickness 50 ⁇ m) using a bar coater # 18 to form a coating film.
- the obtained coating film was heated at 120 ° C. for 1 minute to form a PEDOT-PSS layer (thickness of about 300 nm) on the PET substrate. As a result, an organic conductive film was produced.
- the surface resistance value of the PEDOT-PSS layer before and after the light resistance test was measured at a temperature of 25 ° C. using a Loresta-GP (MCP-T610, series 4 probe probe (ASP)) manufactured by Mitsubishi Chemical Analytech Co., Ltd. ..
- the number of samples of each organic conductive film (sample size: 25 cm 2 (5 cm x 5 cm)) is 3, the number of measurements for each sample is 5, and the surface resistance values are measured for a total of 15 points, and the average value is taken.
- the surface resistance value of each PEDOT-PSS layer was used. Then, the change in surface resistance was calculated from the following equation. The results are shown in Table 2.
- Change in surface resistance Surface resistance value after light resistance test / Surface resistance value before light resistance test (However, for the light resistance test, irradiance 60 W / m 2 , using Xenon Weather Meter X75 manufactured by Suga Test Instruments Co., Ltd., The test was carried out under the conditions of BPT temperature 63 ° C., tank temperature 40 ° C., tank humidity 50% rh, and test time to 500 hours.)
- Example 1 the change in surface resistance was suppressed to a low level even after 500 hours had elapsed, and specifically, the change in surface resistance value was within 300. This value was smaller than that of Comparative Example 1.
- Base material layer 1 ... Base material layer, 2 ... Acid-based organic conductive polymer layer, 10 ... Organic conductive film.
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Abstract
Description
図1は、一実施形態に係る有機導電フィルムの模式断面図である。有機導電フィルム10は、基材層1と、基材層1上に酸系有機導電性高分子層2とを備える。
基材層は、有機導電フィルムの基材として機能する。基材層の材質としては、樹脂及びガラスが挙げられる。すなわち、基材層は、樹脂基材又はガラス基材を含んでよく、樹脂基材又はガラス基材であってよい。
酸系有機導電性高分子層は導電性を有しており、酸系有機導電性高分子を含む。酸系有機導電性高分子とは、本明細書においてπ共役系導電性高分子と、π共役系導電性高分子に対するポリアニオンドーパントを含む導電性複合体を意味する。π共役系導電性高分子としては特に制限されないが、ポリチオフェン、ポリピロール、ポリアニリン、ポリアセチレン、ポリフェニレンビニレン、ポリナフタレン、これらの誘導体等が挙げられる。これらのうち、透明性、導電性、安定性等の観点から、π共役系導電性高分子は特にポリチオフェン系導電性高分子であってよい。
表面抵抗変化=耐光性試験後の表面抵抗値/耐光性試験前の表面抵抗値
ただし、耐光性試験とは、キセノンタイプによる促進耐光性試験(条件:放射照度60W/m2、BPT温度63℃、槽内温度40℃、槽内湿度50%rh、試験時間500時間)である。
電磁波抑制シートは、有機導電フィルムと、誘電体層と、電磁波遮蔽層と、を備える積層体であるということができる。電磁波抑制シートの製造方法は特に制限されないが、例えば以下の方法が挙げられる。
(1)有機導電フィルムを、誘電体層と電磁波遮蔽層とが積層されている積層体に接着する方法。
(2)誘電体層と電磁波遮蔽層とが積層されている積層体に、コーティングにより酸系有機導電性高分子層を形成し、その上に基材層を接着する方法。
(3)誘電体層と電磁波遮蔽層とが積層されている積層体に、コーティングにより酸系有機導電性高分子層を形成し、その上に基材層を押し出す方法。
酸系有機導電性高分子、アルカリ中和剤及び液状媒体を含む塗液を調製する工程と、塗液を基材層上に塗布する工程と、塗布された塗液から液状媒体を除去する工程と、を備える。
塗液は、酸系有機導電性高分子層において例示した上記材料に加え、アルカリ中和剤を含有する。アルカリ中和剤としては、塗液のpHを調整でき、かつ酸系有機導電性高分子の複合状態に影響を与え難いものであれば特に制限されないが、例えば、アルカリ金属やアルカリ土類金属等の水酸化物や炭酸塩、アンモニア等のアンモニウム化合物、アミン類などが挙げられる。入手容易性の観点から、アルカリ中和剤はアンモニアを含んでよい。
液状溶媒としては特に制限されず、例えば、水、有機溶媒、水及び有機溶媒の混合溶媒等が挙げられる。
ポリ(3,4-エチレンジオキシチオフェン)-ポリ(スチレンスルホン酸)(PEDOT-PSS)分散液として、Heraeus株式会社製の分散液Clevios PH1000(pH=3)を準備した。また、アルカリ中和剤を含む溶液として、関東化学株式会社製のアンモニア水(pH=12)を準備した。そして、表1に従い塗液1~3を準備した。塗液1は上記分散液そのものであり、塗液2及び3は、分散液PH1000にアンモニア水を添加することでpHを調整したものである。25℃における塗液のpHは、株式会社堀場製作所製の卓上型pHメーターF-37により測定した。
ポリエチレンテレフタレート基材(PET、厚さ50μm)上に、バーコーター#18を用いて各塗液を塗布し、塗膜を形成した。得られた塗膜を120℃で1分間加熱することで、PET基材上にPEDOT-PSS層(厚さ約300nm)を形成した。これにより有機導電フィルムを作製した。
(PEDOT-PSS層中のカチオン含有量)
PEDOT-PSS層中に残存するアンモニウムイオンを、ダイオネクス株式会社製のイオンクロマトグラフDX-320を用いて定量した。各有機導電フィルム(サンプルサイズ:1cm2(1cm×1cm))を抽出溶媒(超純水100ml)に入れ、25℃環境下で24時間静置した。静置後の抽出溶媒を超純水で50倍に希釈後、イオンクロマトグラフにてアンモニウムイオンの定量を行った。定量結果をもとに、PEDOT-PSS層中に残存するアンモニウムイオンの含有量を算出した。結果を表2に示す。
PEDOT-PSS層の耐光性試験前後の表面抵抗値を、株式会社三菱ケミカルアナリテック製のロレスタ-GP(MCP-T610、直列4探針プローブ(ASP))を用いて、温度25℃で測定した。各有機導電フィルム(サンプルサイズ:25cm2(5cm×5cm))のサンプル数を3、各サンプルに対する測定回数を5回として、計15点について表面抵抗値を測定して平均値をとり、それを各PEDOT-PSS層の表面抵抗値とした。そして、下記式より表面抵抗変化を算出した。結果を表2に示す。
表面抵抗変化=耐光性試験後の表面抵抗値/耐光性試験前の表面抵抗値
(ただし、耐光性試験は、スガ試験機株式会社製キセノンウェザメーターX75を用いて、放射照度60W/m2、BPT温度63℃、槽内温度40℃、槽内湿度50%rh、試験時間~500時間の条件にて実施した。)
Claims (9)
- 酸系有機導電性高分子、アルカリ中和剤及び液状媒体を含み、25℃におけるpHが4.0~6.5である塗液を調製する工程と、
前記塗液を基材層上に塗布する工程と、
塗布された前記塗液から前記液状媒体を除去する工程と、を備える、有機導電フィルムの製造方法。 - 前記酸系有機導電性高分子が、ポリチオフェン系導電性高分子を含む、請求項1に記載の製造方法。
- 前記アルカリ中和剤が、アンモニアを含む、請求項1又は2に記載の製造方法。
- 基材層と、基材層上に酸系有機導電性高分子層と、を備え、前記酸系有機導電性高分子層におけるアルカリ中和剤由来のカチオン含有量が0.5~5.0mg/cm3である、有機導電フィルム。
- 前記酸系有機導電性高分子が、ポリチオフェン系導電性高分子を含む、請求項4に記載のフィルム。
- 前記アルカリ中和剤由来のカチオンが、アンモニウムイオンを含む、請求項4又は5に記載のフィルム。
- 前記基材層が樹脂基材又はガラス基材を含む、請求項4~6のいずれか一項に記載のフィルム。
- 電磁波抑制シートの抵抗被膜又は電子デバイスにおける回路材料として用いられる、請求項4~7のいずれか一項に記載のフィルム。
- 請求項4~8のいずれか一項に記載のフィルムと、誘電体層と、電磁波遮蔽層と、を備える積層体。
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| EP21866599.0A EP4212255A4 (en) | 2020-09-08 | 2021-08-31 | METHOD FOR MANUFACTURING ORGANIC CONDUCTIVE FILM, ORGANIC CONDUCTIVE FILM AND LAMINATE |
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