WO2009107758A1 - 透明導電膜付き基材とその製造方法、およびそれを用いたタッチパネル - Google Patents
透明導電膜付き基材とその製造方法、およびそれを用いたタッチパネル Download PDFInfo
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- WO2009107758A1 WO2009107758A1 PCT/JP2009/053633 JP2009053633W WO2009107758A1 WO 2009107758 A1 WO2009107758 A1 WO 2009107758A1 JP 2009053633 W JP2009053633 W JP 2009053633W WO 2009107758 A1 WO2009107758 A1 WO 2009107758A1
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- conductive film
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- transparent conductive
- thermosetting resin
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- 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
- 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
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
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- 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
- H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer
Definitions
- the present invention relates to a substrate with a transparent conductive film using carbon nanotubes as a conductive film, a manufacturing method thereof, and a touch panel using the substrate with a transparent conductive film.
- Carbon nanotubes hereinafter abbreviated as CNT
- conductive polymers are known as materials for forming a conductive film of a substrate with a transparent conductive film.
- the conductive film can be applied at room temperature and atmospheric pressure, and the conductive film can be formed by a simple process.
- these materials are rich in flexibility, even when a conductive film is formed on a flexible film, the flexibility of the film can be followed.
- the conductive film can be continuously formed, so that the process cost can be reduced.
- These conductive films can improve transparency by reducing the film thickness.
- CNT is black, a neutral color tone can be obtained.
- CNT has been difficult to disperse in a solvent, but recently, a composition containing a conductive polymer, a solvent, and CNT has been proposed as a composition with improved dispersibility of CNT (for example, patents).
- Reference 1 A conductive film having excellent transparency and conductivity can be obtained by such a dispersion method, but the adhesion of the CNT film to the substrate was insufficient. Therefore, a method of forming a conductive layer made of CNT by applying a coating solution containing a binder resin, CNT, and a solvent on the surface of the substrate (for example, Patent Document 2), or a polymer layer on a conductive film containing CNT.
- a provided multilayer structure for example, Patent Document 3 has been proposed.
- the binder resin In the method of adding the binder resin, there is a problem that the resistance increases because the binder resin is interposed at the contact point between the CNTs in the CNT film spread in a mesh shape. Further, in the method of providing a polymer layer on a conductive film made of CNT, the CNT conductive film may be peeled off during the process because the adhesion of the CNT conductive film before forming the polymer layer is insufficient.
- An object of the present invention is to provide a substrate with a low-resistance transparent conductive film having a carbon nanotube conductive film excellent in adhesion to the substrate and in-plane uniformity.
- the present invention has the following configuration.
- Transparent conductive substrate having a transparent support substrate, a thermosetting resin film containing 50% by weight or more of melamine resin, and a carbon nanotube conductive film in this order, and the linearity of resistance of the carbon nanotube conductive film within 1.5% A substrate with a film.
- this invention includes the touch panel which has said base material with a transparent conductive film.
- a substrate with a transparent conductive film having a conductive film excellent in adhesion to the substrate and in-plane uniformity can be obtained.
- the substrate with a transparent conductive film of the present invention is used for a touch panel, calibration can be performed so that there is almost no deviation between the touched point and the screen, and a practical level touch panel is obtained.
- the substrate with a transparent conductive film of the present invention has a transparent support substrate, a thermosetting resin film, and a CNT conductive film in this order.
- the transparent support substrate refers to a substrate having a high visible light transmittance, and specifically refers to a substrate having a light transmittance of 50% or more at a wavelength of 550 nm.
- Examples of the supporting substrate used in the present invention include resin and glass. Even a film that can be wound up with a thickness of 250 ⁇ m or less or a substrate with a thickness of more than 250 ⁇ m may be used.
- the resin include polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyimide, polyphenylene sulfide, aramid, polypropylene, polyethylene, polylactic acid, polyvinyl chloride, polycarbonate, polymethyl methacrylate, and alicyclic acrylic resin. And cycloolefin resins.
- As the glass ordinary soda glass can be used. Moreover, these several base materials can also be used in combination.
- a composite substrate such as a substrate in which a resin and glass are combined and a substrate in which two or more kinds of resins are laminated may be used.
- the kind of the supporting substrate is not limited to the above, and an optimal one can be selected from transparency, durability, cost and the like according to the use.
- thermosetting resin film In the present invention, the adhesiveness of the CNT conductive film to the support substrate can be improved by providing the thermosetting resin film.
- the resin in the thermosetting resin film is crosslinked by thermosetting to ensure adhesion to the surface of the supporting substrate and the contact portion of the CNT conductive film, and also has solvent resistance, moisture resistance, scratch resistance, and heat resistance. It is possible to impart durability such as.
- thermosetting resin film contains at least 50% by weight or more of melamine resin. Since the melamine resin contains many polar groups such as hydroxyl groups and imino groups, the wettability with respect to water, an aqueous mixed solvent, and a CNT dispersion using these as a dispersion medium is improved. For this reason, when a CNT dispersion liquid is applied on a thermosetting resin film containing a melamine resin, the dispersion liquid is easily wetted, and a uniform CNT conductive film can be formed.
- the electrically conductive film excellent in the in-plane uniformity of surface resistance is obtained. Due to the excellent in-plane uniformity, for example, when an electrode is provided at the end of the conductive film, a conductive film excellent in resistance linearity (linearity) between the electrodes can be obtained.
- thermosetting resin film When the melamine resin contained in the thermosetting resin film is less than 50% by weight, the wettability of water or an aqueous mixed solvent and a CNT dispersion using these as a dispersion medium is poor, and a uniform CNT conductive film is obtained. I can't.
- the content of the melamine resin is preferably 70 to 90% by weight in the thermosetting resin film. By being in this range, a thermosetting resin film excellent in the balance between wettability and adhesiveness can be obtained.
- the melamine resin is a resin obtained by condensation of melamine and formaldehyde.
- a cured film of melamine resin can be obtained by condensing melamine and formaldehyde under alkaline conditions to obtain methylolmelamine, applying this onto a substrate, and then polycondensing by heating.
- the molar ratio of formaldehyde to be reacted with melamine is preferably 2 to 4 with respect to melamine 1.
- methylol melamine Since there are three amino groups in melamine, up to six formaldehydes can react, but methylol melamine, in which about half of them are reacted, can be preferably used because it is easy to handle as a thermosetting resin. Also, methyl etherified melamine resin, butyl etherified melamine resin, etc., in which a part of hydroxyl groups of methylol melamine resin are reacted with alcohol to make part of them alkyl ether can be used. In particular, a methyl etherified melamine resin is preferably used from the balance between hydrophilicity and affinity for an organic solvent.
- the thermosetting resin film may contain one or more thermosetting resins other than the melamine resin.
- a thermosetting resin other than the melamine resin By including a thermosetting resin other than the melamine resin, the curing temperature, wettability, durability and the like can be adjusted to a desired range.
- resins other than melamine resins include, but are not limited to, phenol resins, alkyd resins, epoxy resins, acrylic resins, vinyl alcohol copolymer resins, isocyanate resins, and urethane resins. You can choose.
- a resin having a hydroxyl group or a carboxyl group is preferable because it can be crosslinked with a melamine resin to form a thermosetting resin film having more excellent durability.
- Epoxy resins are preferable because the thermosetting temperature can be adjusted variously. For example, only the epoxy resin is cured at 80 to 120 ° C., and then the temperature is increased to 150 to 200 ° C. to crosslink the epoxy resin and the melamine resin. It can
- the thermosetting resin film may contain other components as necessary.
- examples thereof include compounds having an acid such as carboxylic acid and sulfonic acid, compounds having a base such as amine, and compounds having a reactive functional group such as epoxy, oxetane, hydroxy, and isocyanate.
- These compounds are preferably polyfunctional compounds having two or more acids, bases, or reactive functional groups in one molecule. These may be resins or low molecular compounds. Among these, compounds that can be used as curing agents for melamine resins are preferably used.
- a curing reaction can be adjusted by adding a polymerization initiator.
- membrane before carrying out heat crosslinking of a melamine resin can be adjusted by containing photocuring type
- the substrate with a transparent conductive film of the present invention preferably has a resistance value change within 20% after heat treatment at 150 ° C. for 30 minutes.
- the resistance value changes more than 20%, whereas by providing a thermosetting resin film containing melamine resin, this is within 20%. Can be.
- the reason why the resistance value of the CNT conductive film is increased by the heat treatment and the reason why the resistance value change can be suppressed by providing the thermosetting resin film is not clear. It seems to work with the melamine resin that elutes.
- the heat treatment performed here assumes a heat history by a post-process such as applying a conductive paste to connect an external circuit to the peripheral portion of the substrate with a conductive film and performing a heat curing treatment, for example. Yes.
- the heat treatment conditions vary depending on the type of the post-process, but if the heat treatment is approximately 100 ° C. or higher and 30 minutes or longer, it is equivalent to the case where the heat treatment is performed at 150 ° C. for 30 minutes. Since it is known that a change in resistance value is exhibited, an approximate evaluation can be performed under these conditions.
- the substrate with a conductive film of the present invention provides resistance stability after heat treatment without providing another polymer layer on the CNT conductive film, it is simple and has low surface contact resistance. A membrane can be obtained.
- the thermosetting resin film in the substrate with a transparent conductive film preferably has a surface water contact angle of 60 degrees or less.
- the melamine resin content in the thermosetting resin film may be 50% by weight or more.
- the contact angle of water on the surface of the thermosetting resin film in the substrate with the transparent conductive film is related to the contact angle of water on the surface of the thermosetting resin composition film before the application of the CNT dispersion described later. Due to the heat treatment after the application of the CNT dispersion, polar groups such as hydroxyl groups contained in the thermosetting resin composition film are consumed by the crosslinking reaction, so that the contact angle of water increases.
- the contact angle of water on the surface of the thermosetting resin composition film before application of the CNT dispersion liquid is preferably 40 degrees or less, whereby water on the surface of the thermosetting resin film in the substrate with a transparent conductive film is preferably formed.
- the contact angle is usually 60 degrees or less.
- Water contact angle can be measured using a commercially available contact angle measuring device.
- the contact angle was measured according to JIS R3257 (1999) by dropping 1 to 4 ⁇ l of water onto the membrane surface with a syringe in an atmosphere at room temperature of 25 ° C. and humidity of 50%, and observing the liquid droplets from a horizontal cross section. The angle between the tangent of the drop end and the film plane is determined.
- thermosetting resin film in the substrate with a transparent conductive film a method of measuring the surface of the portion where the transparent conductive film such as the end of the substrate is not applied.
- a method of measuring the surface of the portion where the transparent conductive film such as the end of the substrate is not applied there is a method in which the transparent conductive film layer is polished or etched to expose the surface of the thermosetting resin film, and any method may be used.
- the thickness of the thermosetting resin film is preferably 10 nm or more from the viewpoint of improvement in wettability and strength, and is preferably 10 ⁇ m or less from the standpoint of film thickness uniformity and coating process stability. More preferably, the thickness is 100 nm to 500 nm. By setting the thickness within this range, it is possible to obtain a thermosetting resin film excellent in film thickness uniformity, strength, and wettability by suppressing the influence of coloring by the thermosetting resin. .
- the CNT conductive film in this invention should just contain CNT.
- the CNT used for the CNT conductive film may be any of single-walled CNTs, double-walled CNTs, and multilayered CNTs having three or more layers. CNTs having a diameter of about 0.3 to 100 nm and a length of about 0.1 to 20 ⁇ m are preferably used. In order to increase the transparency of the CNT conductive film and reduce the surface resistance, single-wall CNT or double-wall CNT having a diameter of 10 nm or less is more preferable.
- impurities such as amorphous carbon and catalytic metal are not contained in the aggregate of CNTs as much as possible. When these impurities are contained, it can be appropriately purified by acid treatment or heat treatment.
- the CNT conductive film can be formed by applying a CNT dispersion to a substrate.
- a CNT dispersion liquid it is common to perform a dispersion process using a mixing and dispersing machine or an ultrasonic irradiation device together with CNTs together with a solvent.
- a dispersant such as a surfactant. Any known dispersant is preferably used as the dispersant, but ionic surfactants such as alkylamine salts, quaternary ammonium salts, alkylbenzene sulfonates, sulfonate-containing polymers, and carboxy group-containing cellulose polymers can be used. More preferably used.
- the CNT dispersion used in the present invention preferably contains water. By containing 50% by weight or more of water in the CNT dispersion liquid, uniform dispersion of CNTs can be maintained. For this reason, it is preferable that the CNT electrically conductive film in the base material with a transparent electrically conductive film of this invention is obtained by apply
- a part of the CNT on the lower side of the CNT conductive film has a structure embedded in a thermosetting resin film.
- a state in which a part of the CNT is embedded in the thermosetting resin film can be confirmed by observing a cross section of the substrate with the conductive film with a transmission electron microscope.
- the surface resistance of the CNT conductive film is preferably 1 ⁇ 10 0 ⁇ / ⁇ or more and 1 ⁇ 10 4 ⁇ / ⁇ or less.
- the lower the surface resistance value the better the sensitivity.
- the CNT conductive film layer needs to be formed thicker, the transparency is lowered.
- increasing the surface resistance value is advantageous in terms of transparency but disadvantageous in terms of sensitivity. From the balance of these points, it can use preferably as a base material with a transparent conductive film for touch panels because the surface resistance value of a base material with a transparent conductive film exists in said range.
- the surface resistance value of the substrate with a transparent conductive film is more preferably in the range of 1 ⁇ 10 2 to 2 ⁇ 10 3 ⁇ / ⁇ .
- the surface resistance is measured by pressing a probe having four probes against the surface of the CNT conductive film using a four-probe method, and measuring each center of the measurement sample divided into nine equal parts, The average value is taken as the measured value.
- a low resistivity meter Loresta EP MCP-T360 manufactured by Dia Instruments can be used.
- the value of linearity of resistance of the carbon nanotube conductive film is 1.5% or less.
- the linearity is 1.5% or less, a conductive film having excellent in-plane uniformity can be obtained.
- a uniform CNT conductive film can be formed by providing a thermosetting resin film with good wettability to the CNT dispersion in the lower layer of the CNT conductive film. Linearity is achieved.
- the linearity is a value obtained by evaluating how much the measured value is deviated from an ideal straight line by the maximum value of the deviation.
- Linearity (%) can be calculated by taking ⁇ Emax as the largest value and dividing ⁇ Emax by the value E0 of the ideal voltage at that distance, that is, the equation ( ⁇ Emax / E0) ⁇ 100.
- the actual measurement of linearity can be performed by applying a voltage of 5 V in the direction of 20 cm of a base material sample cut into a size of 5 cm ⁇ 20 cm square, for example, and measuring the voltage at intervals of 2 cm.
- the surface resistance is The surface resistance before peeling is preferably 1.5 times or less.
- the change in surface resistance before and after tape peeling is related to the adhesion of the CNT conductive film. When the adhesion is high, the change in surface resistance is small, and when the adhesion is 1.5 times or less, it can be determined that the adhesion is excellent. Details of the measurement method will be described later.
- the transparency of the substrate with a transparent conductive film of the present invention is preferably such that the light transmittance at a wavelength of 550 nm is 60% or more. If the transmittance
- the transmittance can be obtained by cutting out a piece of a substrate with a transparent conductive film and measuring it using a spectrophotometer.
- thermosetting resin composition containing 50% by weight or more of a melamine resin on a transparent support substrate to form a coating film
- CNT dispersion containing 50% by weight or more of water
- the thermosetting resin composition can be applied by dissolving in a solvent.
- Solvents include water, methanol, ethanol, propanol, isopropanol, butanol, toluene, xylene, o-chlorophenol, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, dioxane, ethyl acetate, isobutyl acetate, tetrahydrofuran, propylene carbonate, ethylene glycol , Methyl cellosolve, ethyl cellosolve, methyl cellosolve acetate, propylene glycol, propylene glycol acetate, propylene glycol acetate monomethyl ether, chloroform, trichloroethane, trichloroethylene, chlorobenzene, dichlorobenzene, trichlorobenzene, dimethylformamide
- the coating film of the thermosetting resin composition formed in the step (1) preferably has a contact angle of water at 25 ° C. of 40 ° or less on the surface.
- the CNT dispersion can be uniformly applied to the surface of the coating film of the thermosetting resin composition, and uniformity and adhesion are not generated during drying.
- a CNT conductive film having excellent properties can be formed.
- a CNT dispersion liquid containing 50% by weight or more of water is applied.
- the CNT dispersion liquid is not particularly limited as long as it contains the aforementioned CNT and 50% by weight or more of water. Furthermore, you may include the solvent illustrated in said (1).
- the method for applying the CNT dispersion is not particularly limited as long as it is a method capable of uniformly applying the CNT dispersion, and the method exemplified in the step (1) can be used.
- a method selected from a slit die coating method, a gravure coating method, a reverse coating method, a screen printing method and a printing transfer method is preferable because the uniformity of the applied CNT conductive film is increased.
- the spray method is not preferable because the uniformity of the applied CNT conductive film is lowered.
- a dispersant in order to disperse CNT in water.
- a dispersant an ionic surfactant, a conjugated polymer, or the like can be used.
- the ionic surfactant include the aforementioned alkylamine salts, quaternary ammonium salts, alkylbenzene sulfonates, sulfonate-containing polymers, carboxy group-containing cellulose polymers, and the like, for example, sodium dodecyl sulfonate.
- the conjugated polymer include poly (2-sulfo-1,4-iminophenylene).
- thermosetting resin composition film is not completely cured, but by curing in the step (3), a part of the CNT applied in the step (2) is thermoset.
- a CNT film embedded in the resin film can be formed. Since the embedded CNT is fixed to the thermosetting resin film, it is preferable because the adhesion of the CNT conductive film is further improved.
- the touch panel of the present invention will be described.
- the substrate with a transparent conductive film of the present invention has high transmittance, low resistance, and excellent in-plane uniformity and adhesion to the substrate. It can be particularly suitably used for a touch panel or a capacitive touch panel.
- FIG. 1 is a schematic cross-sectional view showing an example of a resistive film type touch panel.
- the resistive film type touch panel has a structure in which an upper support base 2 is bonded to a lower support base 8 by a frame-like double-sided adhesive tape 7.
- the film 4 is formed in a planar shape so as to face the space 5.
- a thermosetting resin film 3 is provided between the support base 8 and the CNT conductive film 4 and between the support base 2 and the CNT conductive film 4, respectively.
- dot spacers 6 are provided at regular intervals, thereby holding a gap between the upper and lower conductive films.
- the upper surface of the upper support substrate 2 is a surface with which a finger or a pen tip comes into contact, and a hard coat layer 1 is provided to prevent scratches.
- the touch panel having the above configuration is used, for example, by attaching a lead wire and a drive unit and incorporating it on the front surface of the liquid crystal display.
- a capacitive touch panel is a touch panel in which a drive circuit is attached to a transparent conductive film, and a change in capacitance when a finger or the like touches the surface is detected by the drive circuit to determine an operation position.
- the surface resistance on the conductive film side of the substrate with a conductive film was measured by a four-probe method using a low resistance meter (Loresta EPMCP-T360, manufactured by Dia Instruments). The surface resistance was an average value of nine measured values divided into nine equal parts in the plane. Further, a tape peeling test in accordance with JIS K5600-5-6 (1999, cross-cut method) was conducted except that the surface of the film was not cut. Specifically, Nichiban's adhesive tape: “Cellotape (registered trademark)” (CT405A-18) was applied to the surface of the conductive film, rubbed with fingers, allowed to stand completely for 1 minute, and then held one end of the adhesive tape. The film was peeled off in about 1 second while maintaining an angle of 60 ° with respect to the film surface. Changes in surface resistance before and after tape peeling were evaluated. The average of the values measured at three different points on the same sample was taken.
- the surface resistance on the conductive film side of the substrate with the conductive film was measured by a four-probe method using a low resistance meter (manufactured by Dia Instruments, Loresta EPMCP-T360). The surface resistance was an average value of nine measured values divided into nine equal parts in the plane.
- the conductive film was placed in an oven at 150 ° C. for 30 minutes, taken out, and immediately after the substrate with the conductive film returned to room temperature, the surface resistance was measured by the same method as described above. And the base material with an electrically conductive film was left still at room temperature, and surface resistance was measured again 12 hours later.
- thermosetting resin composition a solution of the thermosetting resin composition was prepared.
- 0.83 g poly [melamine-co-formaldehyde] solution manufactured by Aldrich, solid content concentration 84 wt%, 1-butanol solution
- 0.3 g solid epoxy resin 157S70 manufactured by Japan Epoxy Resin Co., Ltd.
- 98.9 g of 2-butanone was added and stirred at room temperature for 30 minutes to prepare a uniform resin solution.
- 0.1 g of thermal polymerization initiator Curezol 2MZ (manufactured by Shikoku Kasei Co., Ltd.) was dissolved in 9.9 g of 1-propanol to prepare a thermal initiator solution.
- a CNT dispersion was prepared.
- 10 mg of single-walled CNT (Science Laboratories, Inc., purity 95%, used as it is without purification) and polystyrene sulfonic acid 18 wt% aqueous solution (manufactured by Aldrich) in ultrapure water at a concentration of 0.1 wt.
- 10 ml of a diluted aqueous solution was added and subjected to ultrasonic irradiation using an ultrasonic homogenizer (VCX-502 manufactured by Tokyo Rika Kikai Co., Ltd., output 250 W, direct irradiation), and a CNT dispersion liquid having a CNT concentration of 0.1% by weight was obtained. Obtained.
- thermosetting resin composition 0.5 ml was dropped onto the PET film on which the above-mentioned thermosetting resin composition film was formed.
- the coating was performed using a bar coater No. 4, the CNT dispersion liquid could be uniformly coated on the entire surface without being repelled. Then, while putting in a 150 degreeC hot-air oven for 30 second and drying, the thermosetting resin composition was fully hardened and the base material 1 with an electrically conductive film was obtained.
- the transmittance of light at a wavelength of 550 nm of the substrate 1 with a conductive film was 82%.
- the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.) was 58 °.
- the surface resistance of the conductive film-side substrate 1 on the conductive film side was 1000 ⁇ / ⁇ . Further, the film surface after the tape peeling test was not changed in appearance at all, and the surface resistance of the peeled portion was measured and found to be 1010 ⁇ / ⁇ .
- the linearity of the substrate 1 with a conductive film was 1.0%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.15 times, and the resistance change 12 hours after the heat treatment was 1.08 times.
- Example 2 Except having changed the base material into the glass substrate of thickness 1.0mm, operation similar to Example 1 was performed and the base material 2 with an electrically conductive film was obtained.
- the light transmittance at a wavelength of 550 nm was 85%
- the surface resistance before the tape peeling test was 950 ⁇ / ⁇
- the appearance did not change after the tape peeling test
- the surface resistance of the peeled portion was 965 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after formation of the thermosetting resin composition film (after drying at 130 ° C.) is 36 °
- the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.).
- thermosetting resin film layer As a result of cutting out the cross section of the substrate 2 with a conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 20 nm CNT film thickness is the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the base material 2 with a conductive film was 1.1%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.16 times, and the resistance change 12 hours after the heat treatment was 1.07 times.
- Example 3 Except having changed the base material into the polycarbonate resin substrate of thickness 1.6mm, operation similar to Example 1 was performed and the base material 3 with an electrically conductive film was obtained.
- the light transmittance at a wavelength of 550 nm was 78%
- the surface resistance before the tape peeling test was 1020 ⁇ / ⁇
- the appearance did not change after the tape peeling test
- the surface resistance of the peeled portion was 1030 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after formation of the thermosetting resin composition film (after drying at 130 ° C.) is 36 °
- the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.).
- thermosetting resin film layer As a result of cutting out the cross section of the substrate 3 with a conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 20 nm CNT film thickness is the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the base material 3 with a conductive film was 1.0%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.16 times, and the resistance change 12 hours after the heat treatment was 1.06 times.
- the light transmittance at a wavelength of 550 nm was 83%, the surface resistance before the tape peeling test was 890 ⁇ / ⁇ , there was no change in the appearance after the tape peeling test, and the surface resistance of the peeled portion was 910 ⁇ / ⁇ .
- thermosetting resin film layer As a result of cutting out the cross section of the base material 4 with a conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 20 nm CNT film thickness becomes the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the substrate 4 with a conductive film was 1.4%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.20 times, and the resistance change 12 hours after the heat treatment was 1.16 times.
- the light transmittance at a wavelength of 550 nm was 83%, the surface resistance before the tape peeling test was 1400 ⁇ / ⁇ , the appearance did not change after the tape peeling test, and the surface resistance of the peeled portion was 1550 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after formation of the thermosetting resin composition film (after drying at 130 ° C.) is 26 °, and the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.). was 50 °.
- the linearity of the substrate 5 with conductive film was 1.4%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.12 times, and the resistance change 12 hours after the heat treatment was 1.06 times.
- Example 6 A substrate 6 with a conductive film was obtained in the same manner as in Example 1 except that the solvent of the CNT dispersion was changed from water alone to a mixed solvent of 60 wt% water and 40 wt% ethanol.
- the light transmittance at a wavelength of 550 nm was 76%
- the surface resistance before the tape peeling test was 1600 ⁇ / ⁇
- the appearance did not change after the tape peeling test
- the surface resistance of the peeled portion was 1800 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after formation of the thermosetting resin composition film (after drying at 130 ° C.) is 36 °
- the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.).
- thermosetting resin film layer As a result of cutting out the cross section of the substrate 6 with a conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 8 nm of the 20 nm CNT film thickness becomes the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the base material 6 with a conductive film was 1.2%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.12 times, and the resistance change 12 hours after the heat treatment was 1.08 times.
- Example 7 A fine dot (diameter 40-50 ⁇ m, height 7 ⁇ m, dot pitch 2 mm) is planted on the surface of the polycarbonate substrate with the transparent conductive film prepared in Example 3 using a transparent acrylic photosensitive resin. Set up. And the base material with a transparent conductive film of the PET film base material produced in Example 1 was bonded to this so that the electrode surfaces face each other, and the periphery was wound with a double-sided tape (thickness 15 ⁇ m, width 3 mm) for adhesion Fixed. In addition, in order to draw out the voltage change by a touch, the conducting wire was provided from each base material. The transmittance of light at a wavelength of 550 nm of the obtained panel was 64%.
- Example 8 The bar coater for applying the CNT dispersion is No. 4 to No. Except having changed to 16, operation similar to Example 1 was performed and the base material 8 with an electrically conductive film was obtained.
- the light transmittance at a wavelength of 550 nm was 55%
- the surface resistance before the tape peeling test was 210 ⁇ / ⁇
- the appearance did not change after the tape peeling test
- the surface resistance of the peeled portion was 350 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after formation of the thermosetting resin composition film (after drying at 130 ° C.) is 36 °
- the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.).
- the lower 8 nm of the 80 nm CNT film thickness is the thermosetting resin film layer. I found that it was embedded.
- the linearity of the substrate 8 with conductive film was 1.0%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.20 times, and the resistance change 12 hours after the heat treatment was 1.10 times.
- thermosetting resin composition film was applied using a bar coater and placed in a 110 ° C. hot air oven for 60 seconds to obtain a semi-cured thermosetting resin composition film.
- the film was allowed to stand in a room at room temperature of 25 ° C. and a relative humidity of 50% for 1 hour, and then the contact angle of water was measured to be 34 °.
- a CNT dispersion was prepared.
- a 10.5 mg monolayer CNT, 10 mg sodium carboxymethylcellulose (Sigma, 90 kDa, 50-200 cps) and 10 ml of pure water were placed in a screw tube, and an ultrasonic homogenizer (VCX-502, manufactured by Tokyo Rika Kikai Co., Ltd.) Ultrasonic irradiation was performed using an output of 250 W and direct irradiation to obtain a CNT dispersion having a CNT concentration of 0.105 wt%.
- a small amount of ethanol was added thereto to prepare a CNT dispersion having a CNT concentration of 0.1% by weight.
- thermosetting resin composition 0.5 ml of the obtained CNT dispersion was dropped onto the PET film on which the above-mentioned thermosetting resin composition film was formed.
- the coating was performed using a bar coater No. 4, the CNT dispersion liquid could be uniformly coated on the entire surface without being repelled. Then, it put into a 150 degreeC hot-air oven for 30 second, while drying, the thermosetting resin composition was fully hardened, and the base material 9 with an electrically conductive film was obtained.
- the transmittance of light at a wavelength of 550 nm of the substrate 9 with a conductive film was 84%.
- the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.) was 56 °.
- the surface resistance on the conductive film side of the base material 9 with the conductive film was 860 ⁇ / ⁇ . Further, the film surface after the tape peeling test was not changed in appearance at all, and the surface resistance of the peeled portion was measured and found to be 860 ⁇ / ⁇ .
- thermosetting resin film layer As a result of cutting out the cross section of the base material 9 with the conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 20 nm CNT film thickness becomes the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the substrate 9 with conductive film was 1.0%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.16 times, and the resistance change 12 hours after the heat treatment was 1.04 times.
- thermosetting resin film layer As a result of cutting out a cross section of the substrate 10 with a conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 20 nm CNT film thickness is a thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the base material with conductive film 10 was 0.7%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.16 times, and the resistance change 12 hours after the heat treatment was 1.04 times.
- Example 11 The composition of the thermosetting resin composition solution was 1.0 g poly [melamine-co-formaldehyde], 49.5 g 2-butanone, and 49.5 g 4-methyl-2-pentanone, The same operation as in Example 9 was performed to obtain a base material 11 with a conductive film.
- the light transmittance at a wavelength of 550 nm was 83%, the surface resistance before the tape peeling test was 900 ⁇ / ⁇ , the appearance did not change after the tape peeling test, and the surface resistance of the peeled portion was 900 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after forming the thermosetting resin composition film (after drying at 110 ° C.) is 32 °, and the contact angle of water on the surface of the resin film after applying the CNT dispersion (after drying at 150 ° C.). was 54 °.
- thermosetting resin film layer As a result of cutting out the cross section of the base material 11 with the conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 20 nm CNT film thickness is the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- thermosetting resin composition solution was 0.9 g poly [melamine-co-formaldehyde], 0.05 g trimellitic anhydride, 0.05 g blocked isocyanate (MF-K60X, manufactured by Asahi Kasei Chemicals Corporation). ), 49.5 g of 2-butanone, and 49.5 g of 4-methyl-2-pentanone, the same operation as in Example 9 was performed to obtain a substrate 12 with a conductive film.
- the light transmittance at a wavelength of 550 nm was 84%
- the surface resistance before the tape peeling test was 880 ⁇ / ⁇
- the appearance did not change after the tape peeling test
- the surface resistance of the peeled portion was 880 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after formation of the thermosetting resin composition film (after drying at 110 ° C.) is 36 °, and the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.). was 60 °.
- thermosetting resin film layer As a result of cutting out the cross section of the base material 11 with the conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 20 nm CNT film thickness is the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the base material 11 with a conductive film was 1.0%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.15 times, and the resistance change 12 hours after the heat treatment was 1.06 times.
- Example 13 The composition of the thermosetting resin composition solution was 0.9 g poly [melamine-co-formaldehyde], 0.05 g trimellitic anhydride, 0.05 g liquid epoxy resin (YD-, manufactured by Toto Kasei Co., Ltd.). 825S), 49.5 g of 2-butanone, and 49.5 g of 4-methyl-2-pentanone, the same operation as in Example 9 was performed to obtain a substrate 13 with a conductive film.
- the light transmittance at a wavelength of 550 nm was 84%, the surface resistance before the tape peeling test was 950 ⁇ / ⁇ , the appearance did not change after the tape peeling test, and the surface resistance of the peeled portion was 950 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after formation of the thermosetting resin composition film (after drying at 125 ° C.) is 36 °, and the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.). was 60 °.
- thermosetting resin film layer As a result of cutting out the cross section of the substrate 13 with a conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 20 nm CNT film thickness is the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the base material 13 with a conductive film was 1.2%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.16 times, and the resistance change 12 hours after the heat treatment was 1.10 times.
- the contact angle of water on the surface of the resin film after forming the thermosetting resin composition film was 70 °.
- Comparative Example 2 The CNT dispersion prepared in Example 1 was directly applied to a film on which the PET film surface was subjected to corona discharge treatment to improve wettability. After application, the same operation as in Example 1 was performed to obtain a substrate 14 with a conductive film having no thermosetting resin film.
- the light transmittance at a wavelength of 550 nm was 84% and the surface resistance before the tape peeling test was 950 ⁇ / ⁇ , but the CNT conductive film was peeled off by the tape peeling test.
- the contact angle of water on the surface of the PET film which was subjected to corona discharge treatment to improve wettability was 40 °.
- the lower layer with a 20 nm CNT film thickness is not embedded in the PET film at all. It was.
- Comparative Example 3 Except having changed the coating method of the solution of the thermosetting resin composition from the bar coater application to the spray application using an airbrush, the same operation as Example 9 was performed and the substrate 15 with an electrically conductive film was obtained.
- the light transmittance at a wavelength of 550 nm was 76%
- the surface resistance before the tape peeling test was 780 ⁇ / ⁇
- the appearance did not change after the tape peeling test
- the surface resistance of the peeled portion was 2860 ⁇ / ⁇ .
- the contact angle of water on the surface of the resin film after formation of the thermosetting resin composition film (after drying at 110 ° C.) is 34 °, and the contact angle of water on the surface of the resin film after application of the CNT dispersion (after drying at 150 ° C.). was 56 °.
- thermosetting resin film layer As a result of cutting out the cross section of the base material 15 with the conductive film and observing it at a magnification of 100,000 using a transmission electron microscope (TEM), the lower 5 nm of the 28 nm CNT film thickness is the thermosetting resin film layer. I found that it was embedded.
- TEM transmission electron microscope
- the linearity of the base material 13 with a conductive film was 24.0%.
- the resistance change immediately after the heat treatment at 150 ° C. for 30 minutes was 1.20 times, and the resistance change 12 hours after the heat treatment was 1.15 times.
- Example 14 A drive circuit for a resistive touch panel was attached to the panel of Example 7 in which two substrates with a transparent conductive film were bonded together, and when a pressing force was applied from the film substrate side, conduction at the pressed point was recognized. And it was confirmed that it works as a resistive touch panel.
- Example 15 When a drive circuit for a capacitive touch panel was attached to the base material with a conductive film 9 produced in Example 9 and the conductive film surface was pressed with a finger, the circuit recognized the pressed point and used as a capacitive touch panel. It was confirmed to work.
- the substrate with a transparent conductive film having high transmittance, low resistance, excellent in-plane uniformity and adhesion to the substrate of the present invention is suitable for touch panels such as resistive touch panels and capacitive touch panels. Used.
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Abstract
Description
2 支持基材
3 熱硬化樹脂膜
4 CNT導電膜
5 空間
6 ドットスペーサー
7 両面接着テープ
8 支持基材
(1)透明な支持基材上に、メラミン樹脂を50重量%以上含む熱硬化性樹脂組成物を塗布して塗布膜を形成する工程、
(2)前記熱硬化性樹脂組成物の塗布膜上に、水を50重量%以上含むCNT分散液を塗布する工程、
(3)前記熱硬化性樹脂組成物の熱硬化温度以上の温度で加熱処理する工程。
透明導電膜付き基材の波長550nmにおける光の透過率を、分光光度計(日立製作所製、U3210)を用いて測定した。
室温25℃、湿度50%の雰囲気下で、膜表面に1~4μlの水をシリンジで滴下した。接触角計(協和界面化学社製、接触角計CA-D型)を用いて、液滴を水平断面から観察し、液滴端部の接線と膜平面とのなす角を求めた。
導電膜付き基材の導電膜側の表面抵抗を低抵抗計(ダイアインスツルメンツ製、ロレスタEPMCP-T360)を用い4探針法で測定した。表面抵抗は、面内9等分した9点の測定値の平均値とした。また、膜表面には切り目を入れない以外はJIS K5600-5-6(1999年、クロスカット法)に準拠したテープ剥離試験を行った。すなわち、導電膜表面にニチバン社の粘着テープ:“セロテープ(登録商標)”(CT405A-18)を貼り付け、指でこすって完全に密着させ、1分放置した後、該粘着テープの一端を持って、フィルム表面に対して60°の角度を保ちながら1秒程度で引き剥がした。テープ剥離前後での表面抵抗の変化を評価した。同一サンプルで3箇所の異なるポイントで測定した値の平均をとった。
導電膜付き基材から切り出した5cm×20cmサンプルの20cm方向に電圧を5V印加した状態で、一方の電極からの距離と電圧の関係を、2cm間隔で測定した。測定した各点における理想電圧値E0と測定電圧E1のずれΔE(=|E1-E0|)のうち最も大きい値をΔEmaxとし、その点における(ΔEmax/E0)×100を、リニアリティ(%)とした。
導電膜付き基材の導電膜側の表面抵抗を低抵抗計(ダイアインスツルメンツ製、ロレスタEPMCP-T360)を用い4探針法で測定した。表面抵抗は、面内9等分した9点の測定値の平均値とした。次いで、該導電膜を150℃のオーブンに30分間投入し、取り出して、導電膜付き基材が室温に戻った直後に上記と同様の方法で表面抵抗を測定した。そして、導電膜付き基材を室温でそのまま静置し、12時間後に再度表面抵抗を測定した。
はじめに熱硬化性樹脂組成物の溶液を調製した。フラスコに0.83gのポリ[メラミン-co-ホルムアルデヒド]溶液(アルドリッチ製、固形分濃度84重量%、1-ブタノール溶液)、0.3gの固形エポキシ樹脂157S70(ジャパンエポキシレジン社製)、および、98.9gの2-ブタノンを入れ、室温で30分撹拌し、均一な樹脂溶液を調製した。これとは別に0.1gの熱重合開始剤キュアゾール2MZ(四国化成社製)を9.9gの1-プロパノールに溶解させ、熱開始剤溶液を調製した。前述の樹脂溶液100mlと熱開始剤溶液1mlを混合して、熱硬化性樹脂組成物の溶液(固形分濃度約1重量%、メラミン樹脂:固形エポキシ樹脂=70重量部:30重量部)を得た。該溶液0.5mlを、A4サイズにカットした厚み188μmのPETフィルム上に滴下し、No.4のバーコーターを用いて塗布した後、130℃の熱風オーブンに30秒間入れて、熱硬化性樹脂組成物膜を得た。該熱硬化性樹脂組成物膜を室温25℃、相対湿度50%の部屋に1時間静置した後、水の接触角を測定したところ36°であった。
基材を厚み1.0mmのガラス基板に変えた以外は実施例1と同様の操作を行い、導電膜付き基材2を得た。波長550nmにおける光の透過率は85%、テープ剥離試験前の表面抵抗は950Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は965Ω/□であった。また、熱硬化性樹脂組成物膜形成後(130℃乾燥後)の樹脂膜表面の水の接触角は36°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は58°であった。
基材を厚み1.6mmのポリカーボネート樹脂基板に変えた以外は実施例1と同様の操作を行い、導電膜付き基材3を得た。波長550nmにおける光の透過率は78%、テープ剥離試験前の表面抵抗は1020Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は1030Ω/□であった。また、熱硬化性樹脂組成物膜形成後(130℃乾燥後)の樹脂膜表面の水の接触角は36°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は58°であった。
熱硬化性樹脂組成物中のメラミン樹脂配合比を、メラミン樹脂:固形エポキシ樹脂=70重量部:30重量部から、50重量部:50重量部に変えた以外は実施例1と同様の操作を行い、導電膜付き基材4を得た。波長550nmにおける光の透過率は83%、テープ剥離試験前の表面抵抗は890Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は910Ω/□であった。また、熱硬化性樹脂組成物膜形成後(130℃乾燥後)の樹脂膜表面の水の接触角は40°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は60°であった。
熱硬化性樹脂組成物中のメラミン樹脂配合比を、メラミン樹脂:固形エポキシ樹脂=70重量部:30重量部から、90重量部:10重量部に変えた以外は実施例1と同様の操作を行い、導電膜付き基材5を得た。波長550nmにおける光の透過率は83%、テープ剥離試験前の表面抵抗は1400Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は1550Ω/□であった。また、熱硬化性樹脂組成物膜形成後(130℃乾燥後)の樹脂膜表面の水の接触角は26°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は50°であった。
CNT分散液の溶媒を水のみから、水60重量%およびエタノール40重量%の混合溶媒に変えた以外は、実施例1と同様の操作を行い、導電膜付き基材6を得た。波長550nmにおける光の透過率は76%、テープ剥離試験前の表面抵抗は1600Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は1800Ω/□であった。また、熱硬化性樹脂組成物膜形成後(130℃乾燥後)の樹脂膜表面の水の接触角は36°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は58°であった。
上述の実施例3で作製したポリカーボネート基材の透明導電膜付き基材表面に、微細ドット(直径40~50μm、高さ7μm、ドット間ピッチ2mm)を透明なアクリル系感光性樹脂を使って植設した。そして、これに実施例1で作製したPETフィルム基材の透明導電膜付き基材を、電極面が対向するように貼り合わせ、周囲を両面テープ(厚さ15μm、幅3mm)で巻いて、接着固定した。なお、タッチによる電圧変化を引き出す為に、各基材から導線を設けておいた。得られたパネルの波長550nmにおける光の透過率は64%であった。
CNT分散液を塗布するバーコーターをNo.4からNo.16に変えた以外は実施例1と同様の操作を行い、導電膜付き基材8を得た。波長550nmにおける光の透過率は55%、テープ剥離試験前の表面抵抗は210Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は350Ω/□であった。また、熱硬化性樹脂組成物膜形成後(130℃乾燥後)の樹脂膜表面の水の接触角は36°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は58°であった。
実施例1と組成の異なる熱硬化性樹脂組成物の溶液を調製した。フラスコに水で再沈澱して精製した0.9gのポリ[メラミン-co-ホルムアルデヒド]、0.1gのトリメリット酸無水物(東京化成工業社製)、49.5gの2-ブタノン、および、49.5gの4-メチル-2-ペンタノンを入れ、室温で30分撹拌して均一な熱硬化性樹脂組成物の溶液(固形分濃度1重量%、精製メラミン樹脂:酸無水物=90重量部:10重量部)を得た。該溶液0.5mlを、A4サイズにカットした厚み188μmのPETフィルム上に滴下し、No.4のバーコーターを用いて塗布し、110℃の熱風オーブンに60秒間入れて、半硬化状態の熱硬化性樹脂組成物膜を得た。該膜を室温25℃、相対湿度50%の部屋に1時間静置した後、水の接触角を測定したところ34°であった。
塗布方法をバーコーターから、200Rのグラビアロールを取り付けたグラビアコーターに代えた以外は実施例9と同様の操作を行い、導電膜付き基材9を得た。波長550nmにおける光の透過率は86%、テープ剥離試験前の表面抵抗は820Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は820Ω/□であった。また、熱硬化性樹脂組成物膜形成後(110℃乾燥後)の樹脂膜表面の水の接触角は34°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は56°であった。
熱硬化性樹脂組成物の溶液の組成を、1.0gのポリ[メラミン-co-ホルムアルデヒド]、49.5gの2-ブタノン、および49.5gの4-メチル-2-ペンタノンとした以外は、実施例9と同様の操作を行い、導電膜付き基材11を得た。波長550nmにおける光の透過率は83%、テープ剥離試験前の表面抵抗は900Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は900Ω/□であった。また、熱硬化性樹脂組成物膜形成後(110℃乾燥後)の樹脂膜表面の水の接触角は32°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は54°であった。
熱硬化性樹脂組成物の溶液の組成を、0.9gのポリ[メラミン-co-ホルムアルデヒド]、0.05gのトリメリット酸無水物、0.05gのブロックイソシアネート(旭化成ケミカルズ社製、MF-K60X)、49.5gの2-ブタノン、および49.5gの4-メチル-2-ペンタノンとした以外は、実施例9と同様の操作を行い、導電膜付き基材12を得た。波長550nmにおける光の透過率は84%、テープ剥離試験前の表面抵抗は880Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は880Ω/□であった。また、熱硬化性樹脂組成物膜形成後(110℃乾燥後)の樹脂膜表面の水の接触角は36°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は60°であった。
熱硬化性樹脂組成物の溶液の組成を、0.9gのポリ[メラミン-co-ホルムアルデヒド]、0.05gのトリメリット酸無水物、0.05gの液状エポキシ樹脂(東都化成社製、YD-825S)、49.5gの2-ブタノン、および49.5gの4-メチル-2-ペンタノンとした以外は、実施例9と同様の操作を行い、導電膜付き基材13を得た。波長550nmにおける光の透過率は84%、テープ剥離試験前の表面抵抗は950Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は950Ω/□であった。また、熱硬化性樹脂組成物膜形成後(125℃乾燥後)の樹脂膜表面の水の接触角は36°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は60°であった。
熱硬化性樹脂組成物中のメラミン樹脂配合比を、メラミン樹脂:固形エポキシ樹脂=70重量部:30重量部から、40重量部:60重量部に変えた以外は実施例1と同様の操作を行った。しかし、樹脂膜表面がCNT分散液をはじいたために導電膜の形成ができなかった。熱硬化性樹脂組成物膜形成後(130℃乾燥後)の樹脂膜表面の水の接触角は70°であった。
PETフィルム表面にコロナ放電処理を施して濡れ性をよくしたフィルムに、実施例1で調製したCNT分散液を直接塗布した。塗布後は実施例1と同様の操作を行い、熱硬化性樹脂膜のない導電膜付き基材14を得た。波長550nmにおける光の透過率は84%、テープ剥離試験前の表面抵抗は950Ω/□であったが、テープ剥離試験により、CNT導電膜が剥離した。なお、コロナ放電処理を施して濡れ性をよくしたPETフィルム表面の水の接触角は40°であった。導電膜付き基材14の断面を切り出し、透過型電子顕微鏡(TEM)を用いて倍率100000倍にて観察を行った結果、20nmあるCNTの膜厚の下層はPETフィルムへは全く埋め込まれていなかった。
熱硬化性樹脂組成物の溶液の塗布方法をバーコーター塗布から、エアブラシを用いたスプレー塗布に代えた以外は、実施例9と同様の操作を行い、導電膜付き基材15を得た。波長550nmにおける光の透過率は76%、テープ剥離試験前の表面抵抗は780Ω/□、テープ剥離試験後の外観の変化は全く無く、剥がした箇所の表面抵抗は2860Ω/□であった。また、熱硬化性樹脂組成物膜形成後(110℃乾燥後)の樹脂膜表面の水の接触角は34°、CNT分散液塗布後(150℃乾燥後)の樹脂膜表面の水の接触角は56°であった。
2つの透明導電膜付き基材を貼り合わせた実施例7のパネルに、抵抗膜式タッチパネル用の駆動回路を取り付け、フィルム基材側から押し圧を加えたところ、押さえた点での導通を認識し、抵抗膜式タッチパネルとして作動することが確認できた。
実施例9で作製した導電膜付き基材9に静電容量式タッチパネル用の駆動回路を取り付け、導電膜表面を指で押さえたところ、押さえた点を回路が認識し、静電容量式タッチパネルとして作動することが確認できた。
Claims (12)
- 透明な支持基材、メラミン樹脂を50重量%以上含む熱硬化樹脂膜およびカーボンナノチューブ導電膜をこの順に有する透明導電膜付き基材であって、該カーボンナノチューブ導電膜の抵抗の直線性の値が1.5%以下である透明導電膜付き基材。
- 前記メラミン樹脂が、メチロール化メラミン樹脂である請求項1の透明導電膜付き基材。
- 前記カーボンナノチューブ導電膜の150℃30分の加熱処理後の抵抗値変化が20%以内である請求項1または2に記載の透明導電膜付き基材。
- 前記カーボンナノチューブ導電膜に含まれるカーボンナノチューブの一部が熱硬化樹脂膜に埋め込まれた構造を有する請求項1~3のいずれかに記載の透明導電膜付き基材。
- 前記カーボンナノチューブ導電膜の表面抵抗が1×100Ω/□以上、1×104Ω/□以下である請求項1~4のいずれかに記載の透明導電膜付き基材。
- 波長550nmにおける光の透過率が60%以上である請求項1~5のいずれかに記載の透明導電膜付き基材。
- 前記カーボンナノチューブ導電膜表面に粘着テープを貼り付け、該粘着テープを60°の角度で剥離した後の表面抵抗が、粘着テープ貼り付け前の表面抵抗の1.5倍以下である請求項1~6のいずれかに記載の透明導電膜付き基材。
- 少なくとも
(1)透明な支持基材上に、メラミン樹脂を50重量%以上含む熱硬化性樹脂組成物を塗布して塗布膜を形成する工程、
(2)前記熱硬化性樹脂組成物の塗布膜上に、水を50重量%以上含むカーボンナノチューブ分散液を塗布する工程、
(3)前記熱硬化性樹脂組成物の熱硬化温度以上の温度で加熱処理する工程、
をこの順に含む請求項1~7のいずれかに記載の透明導電膜付き基材の製造方法。 - 前記(1)の工程において形成される熱硬化性樹脂組成物の塗布膜表面の25℃における水の接触角が40度以下である請求項8記載の透明導電膜付き基材の製造方法。
- 請求項1~7のいずれかに記載の透明導電膜付き基材を有するタッチパネル。
- 2枚の透明導電膜付き基材が空間を介在して導電膜面を対向するように設置された抵抗膜式タッチパネルであって、少なくとも一方の透明導電膜付き基材が請求項1~7のいずれかに記載の透明導電膜付き基材である請求項10に記載のタッチパネル。
- 請求項1~7のいずれかに記載の透明導電膜付き基材および駆動回路を有し、静電容量式タッチパネルである請求項10記載のタッチパネル。
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KR1020107021465A KR101529359B1 (ko) | 2008-02-29 | 2009-02-27 | 투명 도전막 부착 기재와 그의 제조 방법 및 이를 이용한 터치 패널 |
EP09714491.9A EP2249354A4 (en) | 2008-02-29 | 2009-02-27 | SUBSTRATE WITH A TRANSPARENT CONDUCTIVE FILM, MANUFACTURING METHOD AND TOUCH PANEL THEREFOR |
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2009
- 2009-02-27 WO PCT/JP2009/053633 patent/WO2009107758A1/ja active Application Filing
- 2009-02-27 CN CN200980105095.0A patent/CN101946290B/zh not_active Expired - Fee Related
- 2009-02-27 US US12/919,121 patent/US8642895B2/en not_active Expired - Fee Related
- 2009-02-27 KR KR1020107021465A patent/KR101529359B1/ko not_active IP Right Cessation
- 2009-02-27 TW TW098106359A patent/TWI450823B/zh active
- 2009-02-27 EP EP09714491.9A patent/EP2249354A4/en not_active Withdrawn
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JP2011103231A (ja) * | 2009-11-11 | 2011-05-26 | Toray Ind Inc | 透明導電複合材の製造方法およびそれを用いたタッチパネル |
JP2011175890A (ja) * | 2010-02-25 | 2011-09-08 | Toray Ind Inc | 導電性フィルム |
WO2012057321A1 (ja) | 2010-10-29 | 2012-05-03 | 東レ株式会社 | 透明導電積層体およびその製造方法 |
CN102250327A (zh) * | 2011-04-08 | 2011-11-23 | 同济大学 | 含有碳纳米管的芳香族热固性树脂的制备方法 |
CN102250327B (zh) * | 2011-04-08 | 2013-02-13 | 同济大学 | 含有碳纳米管的芳香族热固性树脂的制备方法 |
WO2013115123A1 (ja) * | 2012-01-31 | 2013-08-08 | 東レ株式会社 | 透明導電積層体、その製造方法、それを用いた電子ペーパーおよびそれを用いたタッチパネル |
JP5413538B1 (ja) * | 2012-01-31 | 2014-02-12 | 東レ株式会社 | 透明導電積層体、その製造方法、それを用いた電子ペーパーおよびそれを用いたタッチパネル |
CN103507372A (zh) * | 2012-06-27 | 2014-01-15 | 中国科学院高能物理研究所 | 一种层压阻性板及其制造方法 |
Also Published As
Publication number | Publication date |
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JPWO2009107758A1 (ja) | 2011-07-07 |
TWI450823B (zh) | 2014-09-01 |
KR101529359B1 (ko) | 2015-06-16 |
EP2249354A1 (en) | 2010-11-10 |
US8642895B2 (en) | 2014-02-04 |
EP2249354A4 (en) | 2014-03-12 |
KR20100119579A (ko) | 2010-11-09 |
JP5370151B2 (ja) | 2013-12-18 |
CN101946290A (zh) | 2011-01-12 |
CN101946290B (zh) | 2014-10-15 |
US20110025645A1 (en) | 2011-02-03 |
TW200942410A (en) | 2009-10-16 |
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