WO2011096222A1 - 導電性インキ、および導電パターン付き積層体とその製造方法 - Google Patents
導電性インキ、および導電パターン付き積層体とその製造方法 Download PDFInfo
- Publication number
- WO2011096222A1 WO2011096222A1 PCT/JP2011/000615 JP2011000615W WO2011096222A1 WO 2011096222 A1 WO2011096222 A1 WO 2011096222A1 JP 2011000615 W JP2011000615 W JP 2011000615W WO 2011096222 A1 WO2011096222 A1 WO 2011096222A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductive
- conductive ink
- pattern
- epoxy resin
- conductive pattern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
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
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/52—Electrically conductive inks
-
- 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
Definitions
- the present invention relates to a conductive ink, a laminate with a conductive pattern obtained using the conductive ink, and a method for producing the same.
- Etching methods and printing methods are generally known as electronic parts, thin film forming means for electromagnetic wave shielding, or conductive circuit forming means.
- the etching method means a processing technique in a broad sense including a surface treatment of a metal by dissolving or removing the surface or shape of the metal chemically or electrochemically.
- Etching is a kind of chemical processing, and is mainly performed to obtain a desired pattern shape on a metal film.
- the process is generally complicated and waste liquid treatment is required in the subsequent process, so the cost is also high.
- the conductive circuit formed by the etching method is formed of a metal material such as aluminum or copper, there is a problem that the conductive circuit is weak against physical impact such as bending.
- conductive ink is attracting attention.
- a conductive circuit can be easily formed by printing conductive ink.
- electronic components can be expected to be smaller and lighter, improve productivity, and reduce costs, research and development on conductive ink has been energetically performed, and many proposals have been made (for example, Patent Documents 1 to 4). 9).
- Patent Document 1 describes a method for manufacturing a thermocompression bonding member in which a solvent absorption layer is formed and a conductive paste is screen-printed thereon.
- Patent Document 2 a high-definition conductive circuit is printed by using a conductive ink containing spherical or granular metal particles having a specific average particle size and a maximum particle size on a substrate having a roughened surface. Techniques for forming the are disclosed.
- Patent Document 3 discloses a screen printing ink that controls a TI value (thixo index, thixo index) in order to form a high-definition color filter or the like.
- Patent Document 4 discloses that 60 to 90% by weight of conductive powder having a tap density in the range of 2.5 to 6 g / cm 3 and an average particle size in the range of 0.02 to 1 ⁇ m. And a conductive ink for use in lithographic offset printing containing 10 to 40% by weight of an organic component.
- a copper powder having an average particle size of 20 ⁇ m or less or a silver-plated copper powder, a thermoplastic resin, an additive, and a silane coupling agent as an adhesion improver are added to the solid content of the conductive paint.
- a conductive paint dispersed in an organic solvent containing 001 to 5.0% by weight is disclosed.
- Patent Document 6 in order to provide a conductive paste having high adhesion to a polyimide substrate and having good bending resistance and solvent resistance, one or more of an aluminum compound and a silane coupling agent are used.
- a conductive paste using a binder resin containing two or more types is disclosed.
- Patent Document 7 when the electric resistance, migration resistance, and resistance change rate of the conductor after applying an electric field for a long time under high temperature and high humidity are exhibited, and silver or silver white is exhibited, and the substrate is a PET film.
- a conductive paste that does not cause shrinkage / deformation of the substrate a conductive paste containing a thermoplastic resin containing OH groups, scaly composite conductive powder, scaly silver powder, and a solvent is disclosed.
- Patent Document 8 discloses a conductive paste containing a flat conductive powder, an irregularly shaped conductive powder, a thermoplastic synthetic resin, and a solvent in order to provide a conductive paste capable of imparting good conductivity.
- thermoplastic synthetic resins it is disclosed that epoxy resins, acrylic resins, phenoxy resins, ethyl cellulose, polyvinyl butyral, and the like can be used.
- Patent Document 9 discloses a conductive paste in which an epoxy resin having an epoxy equivalent of more than 500 and a molecular weight of more than 10,000 is dissolved in a solvent having a boiling point of 200 to 250 ° C., and a conductive filler is dispersed. Yes.
- the conductive ink can be classified into a high-temperature firing type as in Patent Document 4 and a low-temperature treatment type.
- the high-temperature firing type applies a high temperature to the base material and the electronic component when forming the conductive pattern, so that problems such as damage to the electronic component and heat shrinkage are likely to occur.
- the demand for a low-temperature treatment type is rapidly increasing.
- simplification of a manufacturing process is calculated
- L / S a pattern performance capable of forming a line / space with a width of 100 ⁇ m or less (100 ⁇ m or less / 100 ⁇ m or less)
- L / S a pattern performance capable of forming a line / space with a width of 100 ⁇ m or less (100 ⁇ m or less / 100 ⁇ m or less)
- L / S a finer L / S (60 ⁇ m or less) with a width of 60 ⁇ m or less. / 60 ⁇ m or less) is also required.
- a printing method of conductive ink As a printing method of conductive ink, a lithographic offset printing method as disclosed in Patent Document 4, a screen printing method, and the like are known. Among these, according to the screen printing method, it is possible to ensure a printing pattern having a thickness of several ⁇ m or more. On the other hand, according to other methods such as the lithographic offset printing method, it is the limit to form a printing pattern having a thickness of about 1 to 2 ⁇ m. For this reason, the screen printing method is suitable for realizing a reduction in resistance of a conductive pattern such as a conductive circuit.
- the screen printing method has a problem that it is not suitable for applications and fields where high-definition printing accuracy is required, as described in Patent Document 4.
- the screen printing method is a method in which the printing ink is printed on the screen printing plate through the mesh of the opening of the screen printing plate while being filled with the screen printing ink and pressed with a squeegee or the like. That is, the screen printing method is a method of bending and printing the screen printing plate by pressing with a squeegee or the like. For this reason, even if an L / S wiring pattern of, for example, 100 ⁇ m or less is formed by the screen printing method, the actual situation is that the line width of the printed material becomes larger than the target line width. As a result, problems such as adjacent wirings approaching or contacting each other and problems such as blurring of edge portions of wirings resulting in unclear borders are caused.
- the reason why such a problem occurs is that the specific gravity of the conductive particles contained in the conductive ink is larger than that of a general printing ink and is contained in a large amount.
- the conductive ink passes through the opening of the screen plate, and after it is transferred to the base material, it is easy to flow and spread out from the printing area due to the weight of the conductive particles itself, etc., until it is dried and solidified. .
- Such a problem is particularly noticeable in a high-definition pattern in which the L / S wiring pattern corresponds to 100 ⁇ m or less.
- conductive particles having a particle size are more likely to flow on the movement of the solvent or binder resin contained in the conductive ink being dried and solidified after printing, as compared with those having a large particle size. For this reason, the “thickening” phenomenon of the line width that protrudes outside the printing region is more likely to occur.
- touch screen panels include an optical method, an ultrasonic method, a resistive film method, a capacitance method, and a piezoelectric method. Of these, the resistive film method is most often used because of the simplicity of the structure.
- a resistive film type touch panel two transparent conductive substrates on which a transparent conductive film is formed are opposed to each other with an interval of approximately 10 to 150 ⁇ m. In the part touched with a finger, a pen or the like, both transparent electrode substrates come into contact with each other and operate as a switch to select a menu on the display screen, input a handwritten character, and the like.
- a transparent conductive film is provided on a transparent plastic film so that the plastic film is partially exposed by indium oxide doped with tin (hereinafter referred to as ITO), and the conductive film is provided on the plastic film and the transparent conductive film.
- a conductive circuit also referred to as a conductive pattern
- an insulating layer is formed on a conductive circuit, and becomes a transparent conductive substrate.
- the present invention has been made in view of the above-mentioned background, and its object is not a so-called high-temperature baking type, but a low-temperature treatment type conductive ink and high-definition conductivity by screen printing.
- a conductive ink that can form a pattern, does not require a special manufacturing process, and has excellent resistance value stability, a laminate with a conductive pattern using the same, and a method for manufacturing the same It is to be.
- the present invention Conductive particles having a tap density of 1.0 to 10.0 (g / cm 3 ), a D50 particle size (50% particle size) of 0.3 to 5 ⁇ m, and a BET specific surface area of 0.3 to 5.0 m 2 / g
- An epoxy resin having a number average molecular weight (Mn) of 10,000 to 300,000, a hydroxyl value of 2 to 300 (mgKOH / g), and an alcohol exchange reaction with a hydroxyl group in the epoxy resin
- the present invention relates to a conductive ink having a storage elastic modulus (G ′) of 5,000 to 50,000 (Pa) containing 0.2 to 20 parts by weight of a metal chelate with respect to 100 parts by weight of an epoxy resin.
- the conductive particles are preferably silver
- the epoxy resin is preferably a bisphenol type epoxy resin.
- the epoxy resin preferably has a number average molecular weight (Mn) of 15,000 to 100,000.
- Mn number average molecular weight
- a more preferable range is that the epoxy resin has a number average molecular weight (Mn) of 20,000 to 100,000 and a hydroxyl value of 50 to 250 (mgKOH / g).
- the tap density of the conductive particles is more preferably 2.0 to 10.0 (g / cm 3 ).
- the storage elastic modulus (G ′) is more preferably 5,000 to 20,000 (Pa).
- the metal chelate is preferably an aluminum chelate
- the aluminum chelate preferably has a group selected from the group consisting of an acetylacetonate group, a methylacetoacetonate group, and an ethylacetoacetonate group.
- the conductive ink described in any one of the inventions can be suitably used for screen printing.
- the epoxy resin further contains a curing agent having a functional group capable of reacting with at least one of a hydroxyl group and an epoxy group of the epoxy resin
- the curing agent is preferably at least one selected from the group consisting of isocyanate compounds, amine compounds, acid anhydride compounds, mercapto compounds, imidazole compounds, dicyandiamide compounds, organic acid hydrazide compounds,
- the curing agent is preferably contained in an amount of 0.5 to 50 parts by weight with respect to 100 parts by weight of the epoxy resin.
- this invention comprises a base material and a conductive pattern formed on the base material, and the conductive pattern is provided with a conductive pattern formed of the conductive ink according to any one of the inventions described above. It relates to a laminate.
- the laminate with a conductive pattern may further include an insulating layer stacked to cover the conductive pattern.
- any one of the laminates with a conductive pattern another conductive film having a predetermined pattern electrically connected to the conductive pattern is further formed on the base material on a lower layer side of the conductive pattern.
- the other conductive film is preferably a transparent conductive film mainly composed of indium oxide doped with tin. Any of the above laminates with a conductive pattern is suitably used for touch screen panel applications.
- the present invention comprises a step of forming a conductive pattern having a desired pattern shape on a substrate by screen printing,
- the said conductive pattern is related with the manufacturing method of the laminated body with a conductive pattern using the conductive ink in any one of the said aspect.
- the present invention provides a step of forming a transparent conductive film having a predetermined pattern so as to be partially exposed on the base material, and the conductive material according to any one of the above aspects on the base material and the transparent conductive film.
- the present invention relates to a method for producing a laminate with a conductive pattern, wherein the transparent conductive film is a film mainly composed of indium oxide doped with tin.
- the substrate is preferably a polyester film.
- the conductive ink according to the present invention is not a so-called high-temperature firing type, but a low-temperature treatment type conductive ink, and can form a high-definition conductive pattern by screen printing.
- An object of the present invention is to provide a conductive ink which does not require a special manufacturing process and is excellent in resistance value stability. Moreover, the outstanding effect that the laminated body with a conductive pattern formed using the said conductive ink and its manufacturing method can be provided is produced.
- FIG. 3 is a schematic cross-sectional configuration diagram of a main part of an example of a resistive film type touch screen panel in which the conductive ink of the present invention is applied to a wiring structure, and corresponds to a II cut line in FIG. 2. It is a perspective view which shows the lamination
- any number A to any number B means a range larger than the numbers A and A but smaller than the numbers B and B.
- the conductive ink of the present invention has a tap density of 1.0 to 10.0 (g / cm 3 ), a D50 particle size of 0.3 to 5 ⁇ m, and a BET specific surface area of 0.3 to 5.0 m 2 / g.
- Active particles an epoxy resin having a number average molecular weight (Mn) of 10,000 to 30,000, a hydroxyl value of 2 to 300 (mgKOH / g), and an alcohol exchange reaction with a hydroxyl group in the epoxy resin, It contains 0.2 to 20 parts by weight of metal chelate with respect to 100 parts by weight of the epoxy resin.
- Examples of the conductive particles used in the conductive ink of the present invention include gold, silver, copper, silver-plated copper powder, silver-copper composite powder, silver-copper alloy, amorphous copper, nickel, chromium, palladium, rhodium, ruthenium, Metal powder such as indium, silicon, aluminum, tungsten, morphbutene, platinum, inorganic powder coated with these metals, powder of metal oxide such as silver oxide, indium oxide, tin oxide, zinc oxide, ruthenium oxide, these Inorganic powders coated with metal oxides, carbon black, graphite and the like can be used. These conductive particles may be used alone or in combination of two or more.
- the trace amount of other electroconductive particles may be contained in the range which does not affect printability and a characteristic.
- the electroconductive particle which has silver as a main component Comprising: The composite particle which contains a trace amount of other electroconductive components in the range which does not affect printability and a characteristic may be sufficient.
- the shape of the conductive particles is not particularly limited as long as the above properties are satisfied, and an indeterminate shape, an aggregated shape, a scale shape, a microcrystalline shape, a spherical shape, a flake shape, and the like can be appropriately used. From the viewpoint of the printability of the high-definition pattern and the adhesiveness of the conductor pattern to the substrate, a spherical or small aggregate having a small particle size is preferable as a relatively small aggregate.
- the conductive particles used in the conductive ink according to the present invention have a tap density of 1.0 to 10.0 (g / cm 3 ), preferably 2.0 to 10.0 (g / cm 3 ). More preferably, it is in the range of 2.0 to 6.0 (g / cm 3 ).
- the D50 particle size of the conductive particles is 0.3 to 5 ⁇ m, preferably in the range of 0.3 to 1.2 ⁇ m, and more preferably in the range of 0.3 to 1 ⁇ m.
- the BET specific surface area is 0.3 to 5.0 m 2 / g, preferably 0.8 to 2.3 m 2 / g, and 0.8 to 2.0 m 2 / g. More preferably it is.
- the tap density of the conductive particles When the tap density of the conductive particles is less than 1.0 (g / cm 3 ), the conductive particles become bulky, and voids between the conductive particles become large, so that the contact point between the conductive particles becomes small. The volume resistivity of the printed material increases. Moreover, the dispersibility when using conductive ink is poor, and the printability of a high-definition pattern is poor. On the other hand, when the tap density exceeds 10.0 (g / cm 3 ), the cost of the conductive particles increases and the manufacturing cost of the high-definition conductive circuit increases. In addition, when the conductive ink is used, the conductive particles are easily precipitated over time.
- the tap density in the present invention refers to the weight per volume after a certain amount of powder is placed in a certain container while being vibrated up and down. The larger the value, the larger the packing density, and the larger the contact point between the particles when conductive particles are obtained, so that good conductivity can be obtained.
- the tap density is 10.0 (g / It is appropriate to use conductive particles of cm 3 ) or less.
- the tap density was measured based on the JIS Z 2512: 2006 method. Specifically, conductive particles (powder amount 100 g) were collected in a graduated glass container (capacity 100 ml) and tapped with a predetermined touching device under a tap stroke of 3 mm and a tap count of 100 times / minute. .
- the D50 particle diameter of the conductive particles is less than 0.3 ⁇ m, the dispersibility of the conductive particles deteriorates when the conductive ink is used, resulting in poor contact between the conductive particles, resulting in a large printed resistance value. There is a possibility. In addition, the cost of the conductive particles increases. On the other hand, if the D50 particle diameter exceeds 5 ⁇ m, the printability of the high-definition pattern may be inferior.
- the cumulative particle size (D50) of the volume particle size distribution was measured using a laser diffraction particle size distribution measuring device “SALAD-3000” manufactured by Shimadzu Corporation.
- the BET specific surface area of the conductive particles is less than 0.3 m 2 / g, the contact point between the conductive particles decreases, and the contact resistance increases.
- the BET specific surface area exceeds 5.0 m 2 / g, a large amount of resin is required to coat the surface of the conductive particles. This is not preferable because the fluidity in the case becomes poor and the leveling property of the surface of the printed coating film is lowered.
- many resin is required to coat
- BET specific surface area is a method of adsorbing molecules whose adsorption occupation area is known to the powder particle surface at the temperature of liquid nitrogen, and obtaining the specific surface area of the sample from the amount, using low-temperature low-humidity physical adsorption of inert gas This is the BET method.
- the BET specific surface area is defined as a value calculated by using the following formula (1) as a surface area measured using a flow type specific surface area measuring device “Flowsorb II” manufactured by Shimadzu Corporation.
- Formula (1) Specific surface area (m 2 / g) surface area (m 2 ) / powder mass (g)
- the conductive ink of the present invention preferably contains 60 to 95% by weight of conductive particles, more preferably 70 to 95% by weight, in a total of 100% by weight of the conductive particles and the epoxy resin described later. More preferably, the content is 85 to 95% by weight. If the conductive particles are less than 60% by weight, the conductivity is not sufficient, and if it exceeds 95% by weight, the epoxy resin is reduced, and the adhesion of the conductive ink to the substrate and the mechanical strength of the coating film may be reduced. There is no.
- the metal chelate is necessary for reacting with a hydroxyl group in an epoxy resin (described later) used in the conductive ink and imparting rheological properties necessary for printability of a high-definition pattern in the screen printing method.
- Such metal chelates are chelate compounds obtained by reacting metal alkoxide with a chelating agent such as ⁇ -diketone or ketoester (such as ethyl acetoacetate), and examples thereof include aluminum chelates, zirconium chelates, and titanium chelates.
- Aluminum chelate is preferably used because of cost, availability and the like.
- the aluminum chelate used in the present invention preferably has a molecular weight of 420 or less, and is preferably an aluminum acetylacetonate complex.
- An acetylacetonate complex includes an acetylacetonate group: —O—C (CH 3 ) ⁇ CH—CO (CH 3 ) and a methyl acetoacetate group: —O—C (CH 3 ) ⁇ CH—CO—O—CH. 3 , ethyl acetoacetate group: —O—C (CH 3 ) ⁇ CH—CO—O—C 2 H 5 and the like.
- the aluminum chelate used in the present invention preferably has 1 to 3 of these groups in one molecule, and has 1 to 3 acetylacetonate groups or 1 to 3 ethylacetoacetate groups. Chelates are more preferred. Aluminum chelates with a molecular weight greater than 420, aluminum chelates with 4 or more acetylacetonate groups in one molecule, aluminum chelates with 4 or more ethyl acetoacetate groups, and aluminum chelates with long chain alkyl groups There is a risk that wetting with the conductive particles is hindered and the resistivity is increased.
- Typical aluminum chelates include ethyl acetoacetate aluminum diisopropionate, aluminum tris (ethyl acetoacetate), alkyl acetoacetate aluminum diisopropylate, aluminum tris (acetyl acetate), aluminum monoacetyl acetate bis (ethyl acetoacetate). Acetate), aluminum di-n-butoxide monomethyl acetoacetate, aluminum diisobutoxide monomethyl acetoacetate, aluminum disec-butoxide monomethyl acetoacetate and the like.
- the zirconium chelate used in the present invention preferably has a molecular weight of 350 or more and 1,000 or less. Further, the zirconium chelate is more preferably an acetylacetonate complex containing 1 to 4 acetylacetonate groups and 0 to 2 ethylacetoacetate groups in one molecule. Zirconium chelates having a molecular weight of less than 350 may cause the dispersion state of the conductive ink to become unstable and increase the resistivity.
- Typical zirconium chelates include zirconium tetraacetylacetonate, zirconium tributoxyacetylacetonate, zirconium monobutoxyacetylacetonate bis (ethylacetoacetate), zirconium dibutoxybis (ethylacetoacetate), zirconium tetraacetylacetate. And the like.
- titanium chelates used in the present invention preferably have a molecular weight of 250 to 1,500.
- alkoxy titanium which can be represented by (HOR 1 O) 2 Ti (OR 2 ) 2 or (H 2 NR 1 O) 2 Ti (OR 2 ) 2 can be given.
- R 1 and R 2 are hydrocarbon groups.
- di-i-propoxybis (acetylacetonato) titanium di-n-butoxybis (triethanolaminato) titanium
- titanium-i-propoxyoctylene glycolate titanium stearate
- titanium acetylacetonate titanium tetraacetyl
- examples include acetonate, polytitanium acetylacetonate, titanium octylene glycolate, titanium ethyl acetoacetate, titanium lactate, and titanium triethanolamate.
- Zirconium chelates having a molecular weight of less than 250 may cause the dispersion state of the conductive ink to become unstable and increase the resistivity.
- the content of the metal chelate used in the present invention is in the range of 0.2 to 20 parts by weight of metal chelate and more preferably in the range of 2 to 10 parts by weight with respect to 100 parts by weight of the epoxy resin described later. preferable. If the metal chelate is less than 0.2 parts by weight, the effect of imparting the elastic properties necessary for the printability of the high-definition pattern in the screen printing method is small, and if it exceeds 20 parts by weight, the imparting of the elastic properties of the conductive ink becomes large. As a result, screen printing cannot be performed, and the resistance value of the conductive ink may be increased.
- the viscosity of the conductive ink in screen printing will be described.
- various printing conditions such as screen mesh and emulsion thickness are set as appropriate, and the base material is selected as appropriate. Has been made.
- the amount of ink transferred to the substrate greatly depends on the amount of ink passing through the screen opening, and as the amount of passage increases, the thin line portion blurs and fattening easily occurs.
- the ink viscosity is too low, when the ink passes through the opening of the screen plate, the ink passes through the back surface around the opening of the screen plate. Inconveniences such as this occur and printing with high accuracy cannot be performed.
- the viscosity at the time of ink filling / transition is regarded as corresponding to the viscosity at high speed rotation by a rotational viscometer.
- the ink becomes stationary when no external force is applied to the ink, and the viscosity in the stationary state is regarded as corresponding to the viscosity at low speed rotation by a rotational viscometer.
- the viscosity is measured at different rotational speeds.
- the line connecting the plots becomes a straight line having a certain slope, or screen printing ink that exhibits a state close to it may form a high-definition print pattern. It has been considered a possible screen printing ink.
- the rotational viscometer there is no absolute index as to which of the rotational speeds corresponds to the above-described high-speed and low-speed viscosities, but 10 of n rotations (low-speed rotations).
- the rotation speed is about 100 to 100 times, and the ratio between the viscosity at high speed rotation and the viscosity at low speed rotation is obtained and evaluated as a TI value (thixo index, thixo index).
- printable inks containing polymer materials such as synthetic resins have properties (viscoelasticity) that have elastic properties (elastic deformation) simultaneously with flow (viscous flow), but compared with elastic behavior. Since the ratio of viscous behavior is high, the viscous behavior is often grasped at a certain rotational speed, that is, a steady flow as described above. However, the viscosity measured in a steady flow changes greatly with time, and reproducible data is often not obtained. From the data such as the TI value of a rotary viscometer, the actual fluidity (viscosity of ink) Flow) and printability is difficult to evaluate. In particular, when high-definition printing such as a line width of 50 ⁇ m is required, it is not sufficient to simply grasp and control viscous flow.
- conductive inks controlled the amount of passage only by viscous flow (so-called viscosity), and a method of increasing the viscosity was used to suppress the amount of passage.
- viscosity if the viscosity is simply increased, fine lines are drawn or breakage is likely to occur in continuous printing.
- thixotropy even when using conductive ink imparted only with so-called thixotropy, the viscosity is high at a low shear rate and the viscosity is low at a high shear rate. It is difficult to print a pattern (for example, an L / S conductive pattern having a line width of 40 ⁇ m / a wiring width of 60 ⁇ m).
- the conductive ink according to the present invention imparts specific elastic properties by reacting an epoxy resin having a specific physical property range with a metal chelate, thereby controlling the amount of ink passing therethrough. Accordingly, a remarkable effect is exhibited in printing a high-definition conductive pattern (for example, a conductive pattern of L / S having a line width of 40 ⁇ m / a width of wiring of 60 ⁇ m).
- the conductive ink of the present invention has a storage elastic modulus G ′ of 5,000 to 50,000 (Pa) at 25 ° C., frequency 1 (Hz), vibration stress 50 (Pa), and elastic properties.
- the storage elastic modulus G ′ is preferably 5,000 to 30,000, and more preferably 5,000 to 20,000.
- the epoxy resin used in the present invention has an epoxy group and a hydroxyl group, and has a number average molecular weight (Mn) of 10,000 to 300,000, preferably 15,000 to 100,000, more preferably It is 18,000 to 100,000, more preferably 20,000 to 100,000, and particularly preferably 20,000 to 70,000. Considering the availability of commercially available products or the ease of production, those having a number average molecular weight of 15,000 to 100,000 are preferred, 15,000 to 70,000 are more preferred, and about 15,000 to 55,000. Are more preferred.
- the hydroxyl value is 2 to 300 (mgKOH / g), the hydroxyl value is preferably 10 to 250 (mgKOH / g), more preferably 50 to 250 (mgKOH / g), and 80 to 200 (mgKOH / g). Is more preferable.
- the epoxy equivalent of the epoxy resin is related to the number average molecular weight of the epoxy resin. Considering that the resistance value between terminals when the conductive ink according to the present invention is printed on a conductive film is taken into consideration, the epoxy equivalent is preferably 5,000 or more. Although an upper limit is not specifically limited, Usually, it is 100,000 or less from the preferable range of a number average molecular weight.
- a more preferable epoxy equivalent is in the range of 5,000 to 50,000, and the range of 6,800 to 18,000 is particularly preferable considering the availability of commercial products.
- the epoxy resin for example, bisphenol type epoxy resins such as bisphenol A, bisphenol F, bisphenol S, and bisphenol AD are preferable, and a phenoxy resin that is a so-called bisphenol type polymer epoxy resin can be suitably used.
- the hydroxyl group undergoes an alcohol exchange reaction with the alkoxy group of the metal chelate, as will be described later, and further imparts rheological properties such as storage elastic modulus G ′ necessary for the printability of the high-definition pattern in the screen printing method.
- an agent it is necessary as a functional group that reacts as an excess hydroxyl group after use in the reaction with the alkoxide group of the metal chelate.
- the number average molecular weight (Mn) of the epoxy resin is less than 10,000, a sufficient storage elastic modulus G ′ cannot be obtained even if a metal chelate is used, and if it exceeds 300,000, the storage elastic modulus G ′ becomes too high. Problems with screen printability may occur. Further, if the hydroxyl group is less than 2 (mgKOH / g), a sufficient storage elastic modulus G ′ cannot be obtained even if a metal chelate is used, and if the hydroxyl value exceeds 300 (mgKOH / g), the storage elastic modulus G ′ is high. This may cause a problem in the screen printability of a high-definition pattern.
- the toffee method is a method in which epichlorohydrin and bisphenols such as bisphenol A and bisphenol F are condensed to a predetermined molecular weight in the presence of an alkali catalyst as necessary.
- a bisphenol-type epoxy monomer having an epoxy group at both ends of a bisphenol such as a bisphenol A-type epoxy monomer or a bisphenol F-type epoxy monomer, and a bisphenol are optionally added in the presence of an alkali catalyst.
- the bisphenol type polymer epoxy resin suitably used in the present invention is a conventional method, for example, JP-A-07-109331, JP-A-10-77329, JP-A-11-147930, JP-A-2006-36801. As described in the above, it can be obtained by appropriately adjusting the type and amount of the alkali catalyst, the type and amount of the organic solvent to be used, the reaction temperature and time, and the like.
- the conductive ink which concerns on this invention can form a conductive pattern by printing on a base material, and can manufacture a laminated body with a conductive pattern.
- This laminated body with a conductive pattern can further include an insulating layer so as to cover the conductive pattern.
- another conductive film having a predetermined pattern electrically connected to the conductive pattern can be further formed on the base material on the lower layer side of the conductive pattern.
- another conductive film may be provided in the upper layer of the conductive pattern, and a plurality of patterns made of conductive ink may be laminated.
- the conductive pattern formed with the conductive ink according to the present invention is particularly effective when it is connected to a transparent conductive film such as an ITO layer, because the resistance value stability that has been conventionally required can be realized. . Therefore, the laminate with a conductive pattern formed with the conductive ink according to the present invention is particularly suitable for a touch screen panel.
- a conductive pattern (hereinafter also referred to as “conductive ink pattern”) formed of a conductive ink and a transparent conductive film include an ITO layer / It becomes a laminated structure of conductive ink pattern / insulating layer / adhesive layer or ITO layer / conductive ink pattern / adhesive layer.
- the conductive ink pattern When the adhesion of the conductive ink pattern to the ITO layer is remarkably poor, the conductive ink pattern is peeled from the ITO layer in an adhesion test using a cellophane tape without being exposed to high temperature and high humidity. In some cases, it may not be necessary to use cellophane tape, and may peel off.
- the adhesion of the conductive ink pattern to the ITO layer is slightly improved, the conductive ink pattern is in close contact with the ITO layer in the initial state. Peel off. If the adhesion of the conductive ink pattern to the ITO layer is further improved, the conductive ink pattern will not peel off from the ITO layer even after an adhesion test after exposure to high temperature and high humidity.
- the adhesion test is performed from above the insulating layer. Then, the conductive ink pattern easily peels off from the interface with the ITO layer together with the insulating layer. For this reason, when it has the laminated structure of ITO layer / conductive ink pattern / insulating layer, the further improvement of adhesiveness is needed.
- the conductive ink pattern is in contact with the insulating layer and the adhesive under high temperature and high humidity.
- the conductive ink pattern is required to be not peeled off from the ITO layer together with the insulating layer by an adhesion test from above on the insulating layer or the like even if exposed to.
- the ITO film is used as the transparent conductive film.
- a transparent conductive film such as indium oxide / zinc oxide (IZO) or zinc oxide (ZnO) may be applied. .
- a curing agent By adding a curing agent to the conductive ink of the present invention, an increase in resistance value between terminals before and after exposure to high temperature and high humidity can be further suppressed.
- curing agent what can react with an epoxy group and a hydroxyl group is used, and what reacts with an epoxy group is preferable.
- the curing agent include isocyanate compounds, amine compounds, acid anhydride compounds, mercapto compounds, imidazole compounds, dicyandiamide compounds, organic acid hydrazide compounds, and the like.
- an isocyanate compound can be used as a hardening
- an amine compound, an acid anhydride compound, a mercapto compound, an imidazole compound, a dicyandiamide compound, and an organic acid hydrazide compound can be used as a curing agent.
- Examples of the isocyanate compound that can be used as the curing agent include non-blocked isocyanate and blocked isocyanate.
- As the isocyanate compound a polyisocyanate compound is preferable.
- As the polyisocyanate compound conventionally known aromatic polyisocyanate, aliphatic polyisocyanate, alicyclic polyisocyanate, or blocked isocyanate which is a block body thereof can be used, and these are used alone or in combination of two or more. May be.
- aromatic polyisocyanate examples include a trimethylolpropane adduct of tolylene diisocyanate, an isocyanurate of tolylene diisocyanate, an oligomer of 4,4'-diphenylmethane diisocyanate, and the like.
- aliphatic polyisocyanates include biurets of hexamethylene diisocyanate, isocyanurates of hexamethylene diisocyanate, uretdiones of hexamethylene diisocyanate, and isocyanurates of copolymers consisting of tolylene diisocyanate and hexamethylene diisocyanate.
- Examples of the alicyclic polyisocyanate include isocyanurates of isophorone diisocyanate.
- As the blocked isocyanate a conventionally known one in which polyisocyanate is blocked with ⁇ -caprolactam, butanone oxime, phenol, active methylene compound or the like can be used.
- examples of the amine compound include aliphatic amines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, dipropylenediamine, and diethylaminopropylamine, N-aminoethylpiperazine, Examples include alicyclic amines such as mensendiamine, isophoronediamine, hydrogenated m-xylenediamine, and aromatic amines such as m-xylylenediamine, m-phenylenediamine, diaminodiphenylmethane, and diaminodiphenylsorbone. Further, amine adducts and ketimines modified with these amines, polyamide resins having a reactive primary amine and secondary amine in the molecule, produced by condensation of dimer acid and polyamine, and the like are also included.
- aliphatic amines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, dipropylened
- examples of the acid anhydride compound include phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, benzophenone tetracarboxylic anhydride, ethylene glycol bistrimellitate, glycerol tris.
- Trimellitate maleic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, methylbutenyltetrahydrophthalic anhydride, dodecenyl succinic anhydride, hexahydrophthalic anhydride Acid, methylhexahydrophthalic anhydride, succinic anhydride, methylcyclohexene dicarboxylic acid anhydride, alkylstyrene-maleic anhydride copolymer, chlorendic acid anhydride, polyazeline acid anhydride, anhydrous Etc. Chirunajikku acid, and the like.
- examples of the mercapto compound include liquid polymercaptan and polysulfide resin.
- examples of the imidazole compound include 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-phenyl-4-methylimidazole, 2,4-dimethylimidazole, 2- Examples include imidazole compounds such as phenyl imidazole, and latent curing agents with improved storage stability such as a type in which these imidazole compounds and epoxy resins are reacted to insolubilize them, or a type in which imidazole compounds are encapsulated in microcapsules.
- examples of the dicyandiamide compound include dicyandiamide (DICY).
- the conductive ink of the present invention may not contain a curing agent, but preferably contains 0.5 to 50 parts by weight of the curing agent with respect to 100 parts by weight of the epoxy resin.
- a curing agent By setting the curing agent to 0.5 parts by weight or more, sufficient adhesion, heat resistance, and the like can be imparted to the printed matter.
- the curing agent exceeds 50 parts by weight, the unreacted curing agent tends to remain in the conductive ink, and it is difficult to impart sufficient adhesion and heat resistance.
- the conductive ink of the present invention can contain a curing accelerator that accelerates the thermal curing of the epoxy resin and the curing agent.
- an organic tin compound, an amine compound, or the like can be used in the reaction between the hydroxyl group of the epoxy resin and the isocyanate compound.
- organotin compounds include stannous octaate (SO) and dibutyltin dilaurate (DBTDL).
- amine compounds include diazabicyclooctane (DABCO), N-ethylmorpholine (NEM), triethylamine (TEA), N, N, N ′, N ′′, N ′′ -pentamethyldiethyltriamine (PMDETA), and the like. It is done.
- dialkyl such as dicyandiamide, tertiary amine compound, phosphine compound, imidazole compound, carboxylic acid hydrazide, aliphatic or aromatic dimethylurea
- dialkyl such as dicyandiamide, tertiary amine compound, phosphine compound, imidazole compound, carboxylic acid hydrazide, aliphatic or aromatic dimethylurea
- examples include ureas.
- the tertiary amine compound include triethylamine, benzyldimethylamine, 1,8-diazabicyclo (5.4.0) undecene-7, 1,5-diazabicyclo (4.3.0) nonene-5, and the like.
- phosphine compound include triphenylphosphine and tributylphosphine.
- imidazole compound the imidazole compound mentioned by the above-mentioned hardening
- imidazole compounds such as 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-phenyl-4-methylimidazole, 2,4-dimethylimidazole, 2-phenylimidazole, etc., and reacting these imidazole compounds with epoxy resins
- a latent curing accelerator with improved storage stability such as a type insolubilized in a solvent or a type in which an imidazole compound is encapsulated in a microcapsule, can be mentioned.
- carboxylic acid hydrazide include succinic acid hydrazide and adipic acid hydrazide.
- the conductive ink of the present invention can be dissolved and diluted with various solvents, and the solid content is preferably 50 to 90% by weight.
- the solvent for dilution can be selected according to the solubility of the resin used and the type of printing method.
- an ester solvent, a ketone solvent, a glycol ether solvent, an aliphatic solvent, an alicyclic solvent, an aromatic solvent, an alcohol solvent, water or the like may be used in combination.
- the ester solvent include ethyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, amyl acetate, ethyl lactate, and dimethyl carbonate.
- ketone solvent examples include acetone, methyl ethyl ketone, methyl isobutyl ketone benzene, diisobutyl ketone, diacetone alcohol, isophorone, and cyclohexanenone.
- glycol ether solvents include ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, etc., acetates of these monoethers, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene Examples include glycol monomethyl ether, propylene glycol monoethyl ether, and acetates of these monoethers.
- the aliphatic solvent include n-heptane, n-hexane, cyclohexane, methylcyclohexane, and ethylcyclohexane.
- the aromatic solvent include toluene, xylene, tetralin and the like.
- the conductive ink of the present invention is obtained by blending conductive particles, epoxy resin, metal chelate, solvent, and the like at a predetermined ratio, mixing them with a disper, and mixing and dispersing them with three rolls if necessary. Can do.
- the conductive ink of the present invention includes a dispersant, an antifriction agent, an infrared absorber, an ultraviolet absorber, a fragrance, an antioxidant, an organic pigment, an inorganic pigment, an antifoaming agent, and a silane coupling as necessary.
- a dispersant an antifriction agent, an infrared absorber, an ultraviolet absorber, a fragrance, an antioxidant, an organic pigment, an inorganic pigment, an antifoaming agent, and a silane coupling as necessary.
- An agent, a plasticizer, a flame retardant, a humectant, and the like can be added.
- a high-definition conductive pattern can be formed by printing on a substrate by various printing methods using the conductive ink of the present invention.
- the conductive pattern include a conductive circuit pattern, various wiring patterns, and an electrode pattern, and are not particularly limited.
- the conductive circuit pattern can be suitably used for wiring of a circuit board of an electronic component.
- the substrate film is not particularly limited, and examples thereof include a polyimide film, a polyparaphenylene terephthalamide film, a polyether nitrile film, a polyether sulfone film, a polyethylene terephthalate film, a polyethylene naphthalate film, and a polyvinyl chloride film. Can be mentioned.
- an ITO layer formed by sputtering, wet coating or the like on a polymer film such as polyethylene terephthalate, polyethylene naphthalate polyester film, polycarbonate, polyethersulfone, acrylic resin, etc., ITO layer ITO glass or the like formed on the glass may be used.
- ceramics, glass substrates and the like can be used.
- an ITO film in which an ITO layer is formed on a polyester film and an ITO glass in which an ITO layer is formed on glass are often used.
- an anchor coat layer is provided on the substrate for the purpose of further improving the printability of the high-definition pattern wiring that is a conductive pattern formed from the conductive ink according to the present invention, and the anchor coat layer is formed on the anchor coat layer.
- a conductive ink can also be printed.
- the anchor coat layer is not particularly limited as long as it has good adhesion to the base material and further conductive ink, and organic fillers such as resin beads and inorganic fillers such as metal oxides are also necessary. Can be added.
- the method for providing the anchor coat layer is not particularly limited, and the anchor coat layer can be obtained by coating, drying and curing by a conventionally known coating method.
- the conductive ink of the present invention can be suitably applied particularly to screen printing, but may be applied to various conventionally known printing methods.
- a fine mesh screen particularly preferably a fine mesh screen of about 400 to 650 mesh, in order to cope with high definition of the conductive circuit pattern.
- the open area of the screen is preferably about 20 to 50%.
- the screen wire diameter is preferably about 10 to 70 ⁇ m.
- the screen plate include polyester screens, combination screens, metal screens, and nylon screens.
- tensile_strength stainless steel screen can be used.
- the screen printing squeegee may be round, rectangular or square, and an abrasive squeegee can be used to reduce the attack angle (angle between printing plate and squeegee).
- Other printing conditions and the like may be appropriately designed according to conventionally known conditions.
- the conductive ink according to the present invention is printed on a substrate such as a substrate, and then heated to dry and solidify. Moreover, when the hardening
- the heating temperature is 80 to 230 for sufficient volatilization of the solvent, and when the curing agent is contained, for sufficient volatilization of the solvent and reaction between the curing agent and the epoxy resin.
- the heating time is preferably 10 to 120 minutes. Thereby, a laminated body with a conductive pattern can be obtained.
- the laminated body with a conductive pattern can be provided with an insulating layer so as to cover the conductive pattern, if necessary.
- the insulating layer is not particularly limited, and a known insulating layer can be applied.
- the laminated body with a conductive pattern can be configured to be electrically connected to a conductive film formed in another layer.
- a transparent conductive layer such as an ITO film and a conductive pattern formed from the conductive ink according to the present invention can be brought into contact with each other to be electrically connected.
- the laminate with a conductive pattern according to the present invention can be suitably used particularly when a wiring structure is formed on a transparent electrode of a touch screen panel.
- FIGS. 1 and 2 are simple conceptual diagrams of the resistive touch screen panel, and the number of wirings, the wiring width, and the interval between the wirings are represented as conceptual diagrams.
- FIG. 2 the laminated state of each substrate side is schematically shown with the viewpoint placed in the middle of the three layers, the position of the adhesive material 5, with the lower substrate 1 side looking down and the upper substrate 2 side looking up. .
- the touch screen panel includes a lower substrate 1 and an upper substrate 2 made of a base material of glass or plastic film (polyethylene terephthalate film, polyethylene naphthalate film, acrylic resin film, polycarbonate film, or the like).
- Transparent electrodes 6 and 7 such as ITO are partially formed on the lower substrate 1 and the upper substrate 2, respectively. As a result, the lower substrate 1 and the upper substrate 2 and the transparent electrodes 6 and 7 are exposed.
- Lower drive electrodes 13 and 14 made of the conductive ink pattern layer 3 are formed on both ends of the transparent electrode 6 on the lower substrate 1, respectively.
- the conductive ink layer 3 is covered with an insulating layer 4. As shown in FIG.
- the conductive ink pattern layer 3 is in contact with the substrate 1, the transparent electrode 6 such as ITO, and the insulating layer 4.
- upper drive electrodes 9 and 10 made of the conductive ink layer 3 are formed on both ends of the transparent conductor 7 on the upper substrate 2.
- the conductive ink pattern layer 3 having a low resistance is formed on the end portion of the transparent electrode 7 on the upper substrate 2 side using the conductive ink of the present invention by screen printing, drying and curing.
- an insulating resist (not shown) is printed on the conductive ink layer 3 and the upper substrate 2 in the vicinity of the conductive ink pattern layer 3 and the end of the transparent electrode 7 by screen printing or the like. Then, it dries and hardens
- Small dot spacers 8 are provided at regular intervals at appropriate positions above. Then, a certain interval (for example, an interval of 10 to 150 ⁇ m) is opened (see FIG. 1) so that the transparent electrodes 6 and 7 do not come into contact with each other except when the input is the original purpose (see FIG. 1).
- the layer 4 and the upper substrate 2, the lower substrate 1 and the upper substrate 2, and the lower substrate 1 and the insulating layer 4 on the upper substrate 2 side are respectively bonded and laminated by the adhesive material 5.
- the adhesive material 5 can be arranged in a frame shape.
- the drive electrodes 13 and 14 on the lower substrate 1 side and the upper drive electrodes 9 and 10 on the upper substrate 2 side may be formed to be orthogonal to each other in plan view.
- connection electrodes 11 and 12 are connected to the drive electrodes 9 and 10 on the upper substrate 2 side by a conductive adhesive, respectively.
- the drive electrodes 13 and 14 on the lower substrate 1 side are connected to the connection electrodes 15 and 16 with a conductive adhesive, respectively.
- the touch screen panel in which the conductive ink pattern layer 3 is formed using the conductive ink of the present invention on each of the lower substrate 1 side and the upper substrate 2 side has good resistance value stability and can be used for various electronic devices over a long period of time. It can be used stably as a component for switching the functions of the above, and has excellent electrical characteristics.
- the conductive ink according to the present invention uses an epoxy resin having a number average molecular weight (Mn) of 10,000 to 300,000 and a hydroxyl value of 2 to 300 (mgKOH / g), and the epoxy resin.
- parts and % mean “parts by weight” and “% by weight”, respectively, and the hydroxyl value means KOH mg / g.
- Binder 1 Japan Epoxy Resin Co., Ltd., JER1256 (weight average molecular weight 57,400, number average molecular weight 25,000, epoxy equivalent 7,500, hydroxyl value 190) 40 parts dissolved in 60 parts isophorone, 40% non-volatile content A binder (1) solution was obtained.
- Binder 2 Japan Epoxy Resin Co., Ltd., JER4250 (weight average molecular weight 57,600, number average molecular weight 24,000, epoxy equivalent 8,500, hydroxyl value 180) 40 parts are dissolved in 60 parts isophorone and 40% non-volatile content A binder (2) solution was obtained.
- Binder 3 Made by Japan Epoxy Resin Co., Ltd., JER1009 (weight average molecular weight 27,700, number average molecular weight 5,200, epoxy equivalent 2,500, hydroxyl value 220) 40 parts dissolved in 60 parts isophorone, 40% non-volatile content A binder (3) solution was obtained.
- Binder 4 Synthesis of Epoxy Resin
- a reactor equipped with a stirrer, a thermometer, a condenser, and a nitrogen gas introduction tube 100 parts of bisphenol A liquid epoxy resin having a number average molecular weight of 380 and an epoxy equivalent of 190, and bisphenol A of 59 having a hydroxyl equivalent of 114. 1 part (epoxy group / hydroxyl molar ratio 1.015) and 106 parts of diethylene glycol monoethyl ether acetate were added.
- Binder 5 Synthesis of Epoxy Resin
- a reactor equipped with a stirrer, a thermometer, a condenser, and a nitrogen gas introduction tube 100 parts of a bisphenol A liquid epoxy resin having a number average molecular weight of 380 and an epoxy equivalent of 190, and a bisphenol A 57. 6 parts (epoxy group / hydroxyl molar ratio 1.041) and 105 parts of diethylene glycol monoethyl ether acetate were added.
- the obtained epoxy resin had a weight average molecular weight of 60,500, a number average molecular weight of 27,000, an epoxy equivalent of 8,800, and a hydroxyl value of 92 per solid content.
- (Binder 7) Synthesis of polyester resin A reactor equipped with a stirrer, a thermometer, a rectifying tube, a nitrogen gas introduction tube, and a decompression device, 20.3 parts of dimethyl terephthalate, 20.3 parts of dimethyl isophthalate, ethylene glycol 9 parts, 18.2 parts of neopentyl glycol, and 0.03 part of tetrabutyl titanate were charged, gradually heated to 180 ° C. while stirring under a nitrogen stream, and subjected to a transesterification reaction at 180 ° C. for 3 hours. Subsequently, 28.3 parts of sebacic acid was added and gradually heated to 180 to 240 ° C. to carry out the esterification reaction.
- Reaction was performed at 240 ° C. for 2 hours, and the acid value was measured. When the acid value became 15 or less, the reaction vessel was gradually depressurized to 1 to 2 Torr, and when the predetermined viscosity was reached, the reaction was stopped and taken out. A polyester resin having 52,900, a number average molecular weight of 23,000, a hydroxyl value of 5, and an acid value of 1 was obtained. 40 parts of the polyester resin was dissolved in 60 parts of isophorone to obtain a binder (7) solution having a nonvolatile content of 40%.
- a polyurethane having a weight average molecular weight of 48,600, a number average molecular weight of 18,000, a hydroxyl value of 4, and an acid value of 10 A resin solution was obtained. 26 parts of isophorone was added to 100 parts of a polyurethane resin solution to obtain a binder (8) solution having a nonvolatile content of 40%.
- the weight average molecular weight, number average molecular weight, epoxy equivalent, acid value and hydroxyl value of binders (1) to (8) were determined according to the following methods.
- GPC gel permeation chromatography
- Shodex GPC-101 manufactured by Showa Denko KK
- Detector Differential refractive index detector Shodex RI-71 manufactured by Showa Denko K.K.
- THF Flow rate Sample side: 1 mL / min Reference side: 0.5 mL / min Temperature: 40 ° C Sample: 0.2% THF solution (100 ⁇ L injection)
- Calibration curve A calibration curve was prepared using 12 standard polystyrenes with the following molecular weights manufactured by Tosoh Corporation.
- the molecular weight was calculated using the line connecting both points as the baseline.
- the main peak was still detected at the retention time of 25 minutes. Therefore, the base line was set in the same manner as in the case of other binders, with a retention time of 30 minutes (molecular weight 250), where a plurality of continuous small peaks were almost not detected on the low molecular weight side of the main peak. Asked.
- Silver powder A A spherical silver powder (tap density 5.5 g / cm 3 , D50 particle diameter 0.9 ⁇ m, specific surface area 0.93 m 2 / g) manufactured by DOWA Electronics Co., Ltd. was used as silver powder A.
- Silver powder B A spherical silver powder (tap density of 4.0 g / cm 3 , D50 particle diameter of 0.5 ⁇ m, specific surface area of 1.77 m 2 / g) manufactured by DOWA Electronics Co., Ltd. was used as silver powder B.
- Silver powder C METALOR spherical silver powder (tap density 2.2 g / cm 3 , D50 particle diameter 0.8 ⁇ m, specific surface area 1.40 m 2 / g) was defined as silver powder C.
- Silver powder D Spherical silver powder (tap density 4.5 g / cm 3 , D50 particle size 0.25 ⁇ m, specific surface area 1.70 m 2 / g) manufactured by Mitsui Kinzoku Co., Ltd. was defined as silver powder D.
- Silver powder E Flake silver metal flake silver powder (tap density 4.8 g / cm 3 , D50 particle diameter 7.9 ⁇ m, specific surface area 0.95 m 2 / g) was used as silver powder E.
- Silver powder F Spherical silver powder (tap density 0.9 g / cm 3 , D50 particle diameter 5.1 ⁇ m, specific surface area 1.91 m 2 / g) manufactured by Mitsui Kinzoku Co., Ltd. was used as silver powder F.
- Silver powder G Metal powder G flake silver powder (tap density 6.1 g / cm 3 , D50 particle size 15.3 ⁇ m, specific surface area 0.09 m 2 / g) was used as silver powder G.
- Silver powder H Flake silver powder (tap density 2.9 g / cm 3 , D50 particle size 5.2 ⁇ m, specific surface area 5.60 m 2 / g) manufactured by SINO-PLATINUM was used as silver powder H.
- D50 particle size The cumulative particle size (D50) of the volume particle size distribution was measured using a laser diffraction particle size distribution analyzer “SALAD-3000” manufactured by Shimadzu Corporation. 2) Tap density It measured based on JIS Z 2512: 2006 method. 3) BET specific surface area A value calculated by the following calculation formula from the surface area measured using a flow type specific surface area measuring device “Flowsorb II” manufactured by Shimadzu Corporation was defined and described as a specific surface area.
- Specific surface area (m 2 / g) surface area (m 2 ) / powder mass (g)
- Metal chelate A As the aluminum chelate, ALCH (general formula (1), solid content 90%) manufactured by Kawaken Fine Chemical Co., Ltd. was used as the metal chelate A.
- Metal chelate B As a titanium chelate, ORGATICS TC-100 (titanium acetylacetonate, solid content 75%) manufactured by Matsumoto Fine Chemical Co., Ltd. was used as metal chelate B.
- Metal chelate C As a zirconium chelate, ORGATIXX ZC-540 (zirconium tributoxy monoacetylacetonate, solid content 45%) manufactured by Matsumoto Fine Chemical Co., Ltd. was used as the metal chelate C.
- [Curing agent 1] A block type hexamethylene diisocyanate curing agent, Duranate MF-K60X (Asahi Kasei Chemicals, solid content 60%) was used as the curing agent (1).
- [Curing agent 2] An imidazole curing agent, Cureduct P-0505 (manufactured by Shikoku Kasei Co., Ltd., solid content: 100%) was used as the curing agent (2).
- Example 1 Preparation of conductive ink> Binder (1) solution containing 40 parts by weight of epoxy resin: 100 parts by weight, metal chelate A containing 0.81 part by weight of aluminum ethyl acetoacetate diisopropionate: 0.9 parts by weight, silver powder A: 330 parts by weight Parts, diethylene glycol monoethyl ether acetate: 40 parts by weight were mixed with a disper and dispersed with three rolls to prepare a conductive ink.
- the obtained conductive ink has a solid content of about 79% by weight. Of the total 370 parts by weight of the epoxy resin and the silver powder, the silver powder is about 89% by weight and the epoxy resin is 11% by weight.
- Examples 2 to 9 Comparative Examples 1 to 9 ⁇ Preparation of conductive ink> Silver powder, a binder resin solution, a metal chelate, a curing agent, and a solvent were mixed with a disper at the blending ratios shown in Tables 1 and 2, and dispersed with three rolls to prepare a conductive ink in the same manner as in Example 1. .
- the characteristic of the obtained conductive ink was measured by the following method.
- a conductive ink of Examples 1 to 12 and Comparative Examples 1 to 9 was screen-printed in a 15 mm ⁇ 30 mm pattern shape on a 75 ⁇ m thick corona-treated polyethylene terephthalate film (hereinafter referred to as PET), and then in a 150 ° C. oven. The film was dried for 30 minutes to obtain a conductive printed material having a film thickness of 8 to 10 ⁇ m.
- PET polyethylene terephthalate film
- the surface resistance value of the printed matter was measured using a Loresta APMCP-T400 measuring instrument manufactured by Mitsubishi Chemical Corporation in an environment of 25 ° C. and 50% humidity.
- volume resistivity was calculated from the surface resistance value measured by the above method and the film thickness.
- the target value of volume resistivity is 5.0 ⁇ 10 ⁇ 5 ⁇ ⁇ cm or less. Note that if it exceeds 5.0 ⁇ 10 ⁇ 5 ⁇ and 8.0 ⁇ 10 ⁇ 5 ⁇ ⁇ cm or less, it is practically useful, but if it exceeds 8.0 ⁇ 10 ⁇ 5, it is usually not practical.
- Volume resistivity ( ⁇ ⁇ cm) (Surface resistivity: ⁇ / ⁇ ) x (Film thickness: cm)
- ⁇ Adhesion to ITO laminated film> A part of an ITO laminated film (Nitto Denko Corporation, V270L-TEMP, 75 ⁇ m thick) was etched with hydrochloric acid to remove the ITO layer to expose the substrate (polyethylene terephthalate film). Then, the conductive inks of Examples 1 to 9 and Comparative Examples 1 to 9 were applied to the ITO laminated portion and the portion where the base material was exposed by etching at 15 mm ⁇ so that the film thickness after drying was 8 to 10 ⁇ m. A 30 mm pattern was screen-printed and dried in a 150 ° C. oven for 30 minutes, and the adhesion of the printed material was evaluated. Evaluation methods and evaluation criteria are as follows.
- ⁇ Tape adhesion test> A tape adhesion test was performed in accordance with JIS K5600. Put a total of 100 squares of 10 squares x 10 squares at 1 m width intervals into the conductive ink layer on each of the remaining ITO and ITO etched parts, and paste Nichiban cellophane tape (25 mm wide) on the printed surface. The evaluation was performed in the state of the cells that were peeled off rapidly and remained. ⁇ : No peeling (good adhesion level) ⁇ : Slightly chipped edges of the mass (adhesion is slightly poor, but practically usable level) X: Peeling over 1 square is observed (adhesion failure level)
- ⁇ Adhesion to polyimide film> Each conductive ink of Examples 1 to 9 and Comparative Examples 1 to 9 on a polyimide film (Toray DuPont, Kapton 100H, 25 ⁇ m thickness) is 15 mm so that the film thickness after drying is 8 to 10 ⁇ m. A pattern of ⁇ 30 mm was screen printed. Then, it dried in 180 degreeC oven for 30 minutes, and evaluated the adhesiveness of this printed matter. Evaluation methods and evaluation criteria are as follows. Nichiban cellophane tape (25 mm width) was applied to the surface of the printed material and peeled off rapidly to evaluate the adhesion of the printed material. ⁇ : Good adhesion without peeling. ⁇ : Slightly peeled off, adhesion slightly poor. X: There is peeling across the entire surface and poor adhesion.
- the printing conditions are as follows.
- the evaluation criteria for the degree of thickening of the thin line “(average value ⁇ 40 ⁇ m) / 40 ⁇ m (%)” are as follows. Less than 25%: almost no thickening of line width is observed, and fine line printability is good. 25-40%: slightly thickening of line width is recognized, but fine line printability exceeds practical level of 40% Wide width is recognized and thin line printability is poor.
- the shape of the fine wiring part of the printed wiring pattern was evaluated according to the following criteria. The results are shown in Tables 1 and 2.
- ⁇ The fine wiring portion was free from variation in thickness due to meandering, bleeding, and wrinkling, and the boundary line of the fine wiring portion was clear and good.
- ⁇ Some variation in thickness due to meandering was observed in the fine wiring part, but it did not bleed or wrinkle, and was practically satisfactory.
- X The fine wiring portion was found to have a variation in thickness due to meandering, bleed and wrinkle, and the boundary line was unclear.
- a movable electrode substrate made of a transparent conductive film and a fixed electrode substrate made of a glass electrode substrate were bonded together with a double-sided adhesive layer made of double-sided tape to produce a resistive touch panel having the configuration shown in FIGS. .
- the drive electrode, handling circuit, and connection electrode of FIG. 2 were screen printed on the substrate from which the ITO transparent electrode film portion and ITO were removed by etching using the conductive inks of Examples 1 to 12 and Comparative Examples 1 to 9. Then, printing was performed and drying was performed at 135 ° C. for 30 minutes.
- a polyurethane resin insulating resist (Rioresist NSP-11, manufactured by Toyo Ink Manufacturing Co., Ltd.) was printed on the drive electrode and the handling circuit by screen printing, and dried at 120 ° C. for 30 minutes.
- the completed upper and lower electrode substrates were bonded with a double-sided tape to produce a resistive touch screen panel. Note that an insulating resist layer was not provided in order for the terminal portion of the extraction circuit to be terminals A and B (not shown).
- the resistance value between terminals A and B in FIG. 2 was measured in an environment of 25 ° C. and 50% humidity.
- the resistance value between terminals after storage for 240 hours in an environment of 60 ° C. and 90% was measured in an environment of 25 ° C. and a humidity of 50%, and the increase rate of the resistance value between terminals after the environmental storage test was as follows. Evaluation based on the criteria. The results are shown in Tables 1 and 2.
- the resistance value between terminals was measured using the Sanwa Denki Keiki PC500 type
- ⁇ Increase rate of resistance between terminals after environmental preservation test is 0 to 10%
- ⁇ 10% to 20% increase in resistance between terminals after environmental preservation test
- ⁇ The increase rate of the resistance value between terminals after the environmental preservation test exceeds 20%.
- the increase rate of the resistance value between terminals after the environmental preservation test is 20% or less. It is.
- Example 11 to which the curing agent (2) was added and Example 12 to which the curing agent (3) was added had the same adhesion to the polyimide film as in the case where the curing agent was not added. In addition to being excellent in terms of performance, when used in a touch screen panel, it is excellent in that the resistance between terminals is small even when exposed to a high temperature and high humidity environment.
- Comparative Example 1 since the binder resin was a polyester resin, the resistance between terminals of the touch panel increased at 60 ° C., 90%, and 240 hours, and the resistance value stability was poor. Moreover, since the binder resin was also a urethane resin in Comparative Example 2, the resistance value stability was poor. In Comparative Example 3, the binder resin is an epoxy resin, but the resistance value stability is poor because the number average molecular weight is less than 10,000, and the thin line printability is also poor because the elastic component of the conductive ink is small.
- Comparative Example 4 the D50 particle size of the silver powder used was less than 0.3 ⁇ m, the volume resistivity of the ink coating film was high, and the level was unusable.
- Comparative Example 5 the silver powder used had a D50 particle size of more than 5 ⁇ m, and when 20 sheets were printed with fine line printability, the fine lines were severed, so the line width could not be measured.
- the mesh portion of the screen printing plate after printing was observed, it was observed that the silver powder was clogged in the mesh at many locations. This is considered to be a problem due to the size increase of D50 particles of silver powder.
- the tap density of the used silver powder was less than 1.0 g / cm 3 , and the volume resistivity of the ink coating film was high, so that it was unusable.
- Comparative Example 7 the specific surface area of the silver powder used was less than 0.3 m 2 / g, and the volume resistivity of the ink coating film was high, so that it was unusable. Moreover, since the diameter of D50 particles of the silver powder used exceeded 5 ⁇ m and 20 sheets were printed with fine line printability as in Comparative Example 2, the line width was measured because the fine lines were wrinkled due to clogging of the mesh. could not.
- Comparative Example 8 the specific surface area of the silver powder used exceeded 5.0 m 2 / g, and a large amount of binder resin was required to cover the surface of the conductive particles. The adhesion was poor.
- Example 3 and Comparative Example 9 the viscosity was measured and the thixotropy was further evaluated.
- Example 3 and Comparative Example 9 differ only in the point of using a binder (1) solution and silver powder C, and containing a metal chelate.
- Viscosity measurement method Measuring machine: E type viscometer TVE-22H made by Toki Sangyo Rotor: Cone type rotor # 7 ( ⁇ 3 °, R7.7mm) Measurement temperature: 25 ° C Sample volume: 0.1 mL Rotation speed: 2rpm, 5rpm, 20rpm Measuring method: 0.1 mL of a silver paste sample is measured using a 1 mL syringe and set in a viscometer. After standing for 1 minute, the viscosity after stirring for 2 minutes at 2 rpm is measured. Thereafter, the viscosity after stirring for 2 minutes at 5 rpm and 20 rpm is measured. The TI value is calculated by the following formula.
- TI (viscosity at 2 rpm) / (viscosity at 20 rpm)
- the comparative example 9 which does not contain a metal chelate, they were 2 rpm: 168 Pas, 5 rpm: 92 Pas, 20 rpm: 46 Pas, and TI value: 3.66. That is, there is not much difference between the two in terms of mere viscosity and thixotropy.
- the storage elastic modulus G ′ of Example 3 is 6,100
- the storage elastic modulus G ′ of Comparative Example 9 is 1,100, showing completely different results in printability.
- the conductive ink according to the present invention is particularly suitable for screen printing applications, but may be applied to other printing methods. Moreover, you may apply the electroconductive ink which concerns on this invention not only to a printing use but to a conductive adhesive use, an electromagnetic wave shielding material, etc. Furthermore, since the laminate with a conductive pattern formed using the conductive ink according to the present invention has little change in conductivity when the humidity is increased, it is suitably used for forming a conductive circuit for printed wiring boards, electronic devices, and the like. be able to.
Landscapes
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Conductive Materials (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Epoxy Resins (AREA)
- Paints Or Removers (AREA)
- Powder Metallurgy (AREA)
- Non-Insulated Conductors (AREA)
- Manufacturing Of Electric Cables (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
特許文献2には、表面を粗面化した基材に対して、特定の平均粒径と最大粒径を持つ球状または粒状の金属粒子を含む導電インキを用い、印刷することにより高精細導電回路を形成する技術が開示されている。
特許文献3には、高精細なカラーフィルター等を形成するために、TI値(チキソインデックス、チキソ指数)を制御するスクリーン印刷用インキが開示されている。
特許文献5には、平均粒径が20μm以下の銅粉又は銀めっきした銅粉、熱可塑性樹脂、添加剤および密着性向上剤としてシラン系カップリング剤を導電性塗料の固形分に対し0.001~5.0重量%の範囲で含む有機溶媒中に分散させた導電性塗料が開示されている。
さらに、特許文献9には、沸点が200~250℃ の溶剤に、エポキシ当量が500を超えるとともに、分子量が10000を超えるエポキシ樹脂を溶解するとともに、導電性フィラーを分散した導電ペーストが開示されている。
また、製品の歩留まり向上、製造コスト低減の観点から、製造工程の簡便化が求められている。このため、上記特許文献1のように溶剤吸収層を設ける工程や、上記特許文献2のように基材の粗面化工程を行う工程を経ずに印刷できる導電性インキが求められている。
例えば、透明なプラスチックフィルム上に錫をドープした酸化インジウム(以下、ITOという)によりプラスチックフィルムが部分的に露出するように透明導電膜が設けられ、このプラスチックフィルム及び透明導電膜の上に導電性インキを用いて導電性回路(導電パターンともいう)が形成される。そして、導電性回路の上に絶縁層が形成され、透明導電性基板となる。次いで、透明導電膜同士が直に接触ないような間隔を開け、向かい合うような状態で、2枚の透明導電性基板が、両面粘着剤で貼り合わされる。
タップ密度が1.0~10.0(g/cm3)、D50粒子径(50%粒子径)が0.3~5μm、BET比表面積0.3~5.0m2/gの導電性粒子と、数平均分子量(Mn)が10,000~300,000であり、水酸基価2~300(mgKOH/g)のエポキシ樹脂と、前記エポキシ樹脂中の水酸基とアルコール交換反応が可能であり、前記エポキシ樹脂100重量部に対して0.2~20重量部の金属キレートとを含有する、貯蔵弾性率(G')が5,000~50,000(Pa)である導電性インキに関する。
前記発明において、導電性粒子は銀であることが好ましく、
前記エポキシ樹脂は、ビスフェノール型エポキシ樹脂であることが好ましい。
前記アルミニウムキレートは、アセチルアセトネート基、メチルアセトアセトネート基およびエチルアセトアセトネート基からなる群より選ばれる基を有することが好ましい。
前記硬化剤は、イソシアネート化合物、アミン化合物、酸無水物化合物、メルカプト化合物、イミダゾール化合物、ジシアンジアミド化合物、有機酸ヒドラジド化合物からなる群より選ばれる一種以上であることが好ましく、
エポキシ樹脂100重量部に対して、前記硬化剤は0.5~50重量部含有することが好ましい。
前記の導電パターン付き積層体は、前記導電パターンを被覆するように積層された絶縁層をさらに具備することができる。
前記他の導電膜は、錫がドープされた酸化インジウムを主成分とする透明導電膜であることが好ましい。
前記のいずれかの導電パターン付き積層体は、タッチスクリーンパネル用途に好適に用いられる。
前記導電パターンは、前記態様のいずれかに記載の導電性インキを用いる導電パターン付き積層体の製造方法に関する。
前記透明導電膜が、錫がドープされた酸化インジウムを主成分とする膜である導電パターン付き積層体の製造方法に関する。
前記基材は、ポリエステルフィルムであることが好ましい。
本発明の導電性インキは、タップ密度が1.0~10.0(g/cm3)、D50粒子径が0.3~5μm、BET比表面積0.3~5.0m2/gの導電性粒子と、数平均分子量(Mn)が10,000~30,0000であり、水酸基価2~300(mgKOH/g)のエポキシ樹脂と、エポキシ樹脂中の水酸基とアルコール交換反応が可能であり、前記エポキシ樹脂100重量部に対して0.2~20重量部の金属キレートとを含有するものである。
本発明に係る導電性インキに用いられる導電性粒子は、タップ密度が1.0~10.0(g/cm3)であり、好ましくは2.0~10.0(g/cm3)であり、より好ましくは2.0~6.0(g/cm3)の範囲である。
また、導電性粒子のD50粒子径は0.3~5μmであり、0.3~1.2μmの範囲であることが好ましく、0.3~1μmの範囲であることがさらに好ましい。
また、BET比表面積は0.3~5.0m2/gであり、0.8~2.3m2/gの範囲であることが好ましく、0.8~2.0m2/gの範囲であることがさらに好ましい。
一方、タップ密度が10.0(g/cm3)を越えると、導電性粒子のコストが高くなり、高精細導電回路の製造コストが高くなる。また、導電性インキにしたときに経時にて導電性粒子が沈殿し易くなる。
なお、タップ密度はJIS Z 2512:2006法に基づいて測定した。具体的には、目盛り付きガラス容器(容量100ml)に、導電性粒子(粉体量100g)を採取し、所定のタッチング装置にてタップストローク3mm、タップ回数100回/分の条件にてタップした。
一方、D50粒子径が5μmを越えると、高精細パターンの印刷性が劣る可能性がある。
なお、導電性粒子のD50粒子径は、島津製作所社製レーザー回折粒度分布測定装置「SALAD-3000」を用いて、体積粒度分布の累積粒度(D50)を測定した。
また、BET比表面積が5.0m2/gを超えると導電性粒子の表面を被覆するのに多くの樹脂を必要とするため、バインダー樹脂であるエポキシ樹脂に対する濡れが劣り、導電性インキにした場合の流動性が悪くなり印刷塗膜の表面のレベリング性が低下するので好ましくない。また、導電性粒子の表面を被覆するのに多くの樹脂を必要とするため、基材に対する導電パターンの密着性も低下する。
BET比表面積とは、粉体粒子表面に吸着占有面積の分かった分子を液体窒素の温度で吸着させ、その量から試料の比表面積を求める方法であり、不活性気体の低温低湿物理吸着を利用したものがBET法である。BET比表面積は、島津製作所製流動式比表面積測定装置「フローソーブII」を用いて測定した表面積を、以下の式(1)を用いて算出した値と定義する。
式(1) 比表面積(m2/g)=表面積(m2)/粉末質量(g)
分子量が420より大きいアルミニウムキレートや、1分子中にアセチルアセトネート基を4個以上有するアルミニウムキレートや、エチルアセトアセテート基を4個以上有するアルミニウムキレートや、更に長鎖のアルキル基を有するアルミニウムキレートは導電性粒子との濡れが阻害されてしまい、抵抗率が上昇する恐れがある。
アルミニウムキレートの代表的なものとしては、エチルアセトアセテートアルミニウムジイソプロピオネート、アルミニウムトリス(エチルアセトアセテート)、アルキルアセトアセテートアルミニウムジイソプロピレート、アルミニウムトリス(アセチルアセテート)、アルミニウムモノアセチルアセテートビス(エチルアセトアセテテート)、アルミニウムジn-ブトキシドモノメチルアセトアセテート、アルミニウムジイソブトキシドモノメチルアセトアセテート、アルミニウムジsec-ブトキシドモノメチルアセトアセテート等が挙げられる。
ジルコニウムキレートの代表的なものとしては、ジルコニウムテトラアセチルアセトネート、ジルコニウムトリブトキシアセチルアセトネート、ジルコニウムモノブトキシアセチルアセトネートビス(エチルアセトアセテート)、ジルコニウムジブトキシビス(エチルアセトアセテート)、ジルコニウムテトラアセチルアセトネート等が挙げられる。
なお、回転粘度計において、いずれの回転数の粘度が上述した高速回転時、および低速回転時粘度に対応するかについての絶対的な指標というものは存在しないが、n回転(低速回転)の10倍~100倍程度を高速回転とし、高速回転時の粘度と低速回転時の粘度の比を求めて、TI値(チキソインデックス、チキソ指数)として評価するのが一般的である。
しかし、定常流で測定される粘度は時間とともに大きく変化し、再現性のあるデータが得られないことが多く、回転粘度計で有られるTI値等のデータから、実際のインキの流動性(粘性流動)、さらに印刷性を評価することは難しい。特に、線幅50μmのような高精細な印刷が求められる場合には、単なる粘性流動の把握、制御だけでは不十分である。
25℃、周波数1(Hz)、振動応力50(Pa)における貯蔵弾性率G'が5,000Pa未満では弾性が弱く、スクリーンの開口部をインキが通過し、基材に転移した後、所定のパターンの形状を維持することが難しくなり、高精細なパターンの印刷性に劣る。
一方、導電性インキの貯蔵弾性率G'が5万Paを超えると弾性が強くなりすぎ、スクリーン刷版上にてインキがローリングできず、またスクリーンに設けられた所定のパターンに充填しづらくなるために、スクリーン印刷ができない。
貯蔵弾性率G'は、5,000~30,000であることが好ましく、5,000~20,000であることがより好ましい。
また、導電性インキのtanδが1を超えると、弾性的性質が少なくなり高精細なパターン印刷性に劣る傾向がある。
導電性インキの粘弾性挙動評価は各方法があるが、正弦振動の周波数を固定し、振動応力を変化させた測定方法が、導電性インキ等の分散系の動的粘弾性を測定する場合には好ましい。
本発明に用いられるエポキシ樹脂としては、エポキシ基および水酸基を有し、数平均分子量(Mn)が10,000~300,000であり、好ましくは15,000~100,000であり、より好ましくは18,000~100,000であり、さらに好ましくは20,000~100,000であり、特に好ましいのは20,000~70,000である。市販品の入手容易性、若しくは製造容易性も考慮すると、数平均分子量が15,000~100,000のものが好ましく、15,000~70,000がより好ましく、15,000~55,000程度のものがさらに好ましい。
また、水酸基価は2~300(mgKOH/g)であり、水酸基価は10~250(mgKOH/g)が好ましく、50~250(mgKOH/g)がより好ましく、80~200(mgKOH/g)がより好ましい。
また、エポキシ樹脂のエポキシ当量は、エポキシ樹脂の数平均分子量と関連している。本発明に係る導電性インキを、導電性フィルムに印刷した場合の端子間抵抗値が良好となる点を考慮すると、エポキシ当量が5,000以上であることが好ましい。上限は特に限定されないが、数平均分子量の好ましい範囲から、通常、100,000以下である。より好ましいエポキシ当量は、5,000~50,000の範囲であり、市販品の入手容易性も考慮すると6,800~18,000の範囲が特に好ましい。
エポキシ樹脂としては、例えばビスフェノールA、ビスフェノールF、ビスフェノールS、ビスフェノールAD等のビスフェノール型エポキシ樹脂が好ましく、いわゆるビスフェノール型高分子エポキシ樹脂であるフェノキシ樹脂を好適に用いることができる。
ここで、水酸基は後述するように金属キレートのアルコキシ基とアルコール交換反応し、スクリーン印刷法における高精細パターンの印刷性に必要な貯蔵弾性率G'等のレオロジー特性を付与させるため、さらには硬化剤を使用した場合、金属キレートのアルコキシド基との反応に使用した後の余剰の水酸基として反応する官能基として必要である。
また、水酸基が2(mgKOH/g)未満では、金属キレートを用いても十分な貯蔵弾性率G'が得られず、水酸基価が300(mgKOH/g)を超えると貯蔵弾性率G'が高くなりすぎて、高精細なパターンのスクリーン印刷性に問題が生じ得る。
タフィー法はエピクロルヒドリンと、ビスフェノールAやビスフェノールF等のビスフェノール類とを、必要に応じアルカリ触媒の存在下に所定の分子量まで縮合させる方法である。
アドバンスド法は、ビスフェノール類の両端にエポキシ基を有する、いわゆるビスフェノールA型エポキシモノマーやビスフェノールF型エポキシモノマー等のビスフェノール型エポキシモノマーと、ビスフェノール類とを、必要に応じアルカリ触媒の存在下に所定の分子量まで縮合させたり、あるいは市販されているエポキシ樹脂をエポキシモノマーとして扱い、上記と同様にして、市販のエポキシ樹脂とビスフェノール類とを、必要に応じアルカリ触媒の存在下に、所定の分子量まで縮合させたりする方法である。
本発明で好適に用いられるビスフェノール型高分子エポキシ樹脂は、常法、例えば特開平07-109331号公報、特開平10-77329号公報、特開平11-147930号公報、特開2006-36801号公報等に記載されるように、アルカリ触媒の種類と量、用いる有機溶剤の種類と量、反応温度と時間等を適宜調整することによって得ることができる。
本発明に係る導電性インキにより形成した導電パターンは、ITO層等の透明導電膜と接続する場合に、従来から求められてきた抵抗値安定性を実現することができるので、特に威力を発揮する。従って、本発明に係る導電性インキにより形成した導電パターン付き積層体は、特にタッチスクリーンパネルに好適である。
タッチスクリーンパネル用の積層体において、導電性インキにより形成した導電パターン(以下、「導電性インキパターン」とも云う)と透明導電膜とは、透明導電膜としてITO層を用いた場合、ITO層/導電性インキパターン/絶縁層/粘着剤層、又はITO層/導電性インキパターン/粘着剤層という積層構成となる。
ITO層への導電性インキパターンの密着性が少々改良されると、初期状態ではITO層に密着しているが、高温高湿下に曝露後、密着性試験をすると導電性インキパターンがITO層から剥がれる。
ITO層への導電性インキパターンの密着性がもう少し改良されると、高温高湿下に曝露後、密着性試験をしても、導電性インキパターンがITO層から剥がれなくなる。ところが、上記特性が得られた場合であっても、導電性インキパターンに絶縁層や粘着剤が接している状態で高温高湿下に曝露させた後、絶縁層等の上から密着性試験をすると、絶縁層と一緒に導電性インキパターンがITO層との界面から剥がれやすくなる。このため、ITO層/導電性インキパターン/絶縁層の積層構造を有する場合、密着性のさらなる改良が必要となる。
タッチスクリーンパネルの用途が広がり、要求性能が高まってくると、高温高湿下に曝露しても、端子間抵抗値ができるだけ上昇しないことが従来以上に強く求められる。
一方、本発明に係る導電性インキを用いることにより、端子間抵抗値の上昇を小さくすることができる。これは、上述の特定の物性範囲のエポキシ樹脂を用いたことによるものである。すなわち、本発明に係る導電性インキにより、従来より抵抗値安定性に特に問題のあったITO層/導電性インキパターン/絶縁層の積層構造を有する導電パターン付き積層体において、良好な抵抗値安定性が得られることがわかった。
かかる硬化剤としては、エポキシ基や水酸基と反応し得るものが用いられ、エポキシ基と反応するものが好ましい。硬化剤としては、イソシアネート化合物、アミン化合物、酸無水物化合物、メルカプト化合物、イミダゾール化合物、ジシアンジアミド化合物、有機酸ヒドラジド化合物等が挙げられる。
例えば、エポキシ樹脂の水酸基と反応させる場合は、硬化剤としてイソシアネート化合物を用いることができる。
エポキシ樹脂のエポキシ基と反応させる場合は、アミン化合物、酸無水物化合物、メルカプト化合物、イミダゾール化合物、ジシアンジアミド化合物、有機酸ヒドラジド化合物を硬化剤として用いることができる。
イソシアネート化合物としては、ポリイソシアネート化合物が好ましい。ポリイソシアネート化合物としては、従来公知の芳香族ポリイソシアネート、脂肪族ポリイソシアネート、脂環族ポリイソシアネート、またはこれらのブロック体であるブロック化イソシアネートを使用でき、これらは単種および2種以上を使用してもよい。芳香族ポリイソシアネートとしては、トリレンジイソシアネートのトリメチロールプロパンアダクト体、トリレンジイソシアネートのイソシアヌレート体、4,4′-ジフェニルメタンジイソシアネートのオリゴマーなどが挙げられる。
脂肪族ポリイシシアネートとしては、ヘキサメチレンジイソシアネートのビウレット体、ヘキサメチレンジイソシアネートのイソシアヌレート体、ヘキサメチレンジイソシアネートのウレトジオン、トリレンジイソシアネートとヘキサメチレンジイソシアネートからなるコポリマーのイソシアヌレート体が挙げられる。脂環族ポリイソシアネートとしては、イソホロンジイソシアネートのイソシアヌレート体が挙げられる。ブロック化イソシアネートとしては、ポリイソシアネートがε-カプロラクタム、ブタノンオキシム、フェノール、活性メチレン化合物等でブロックされた従来公知のものを使用することができる。
希釈用の溶剤は、使用する樹脂の溶解性や印刷方法等の種類に応じて、選択する事ができる。
例えば、エステル系溶剤、ケトン系溶剤、グリコールエーテル系溶剤、脂肪族系溶剤、脂環族系溶剤、芳香族系溶剤、アルコール系溶剤、水等の1種または2種以上を混合して用いる事ができるが、これらに限定されるものではない。
例えば、エステル系溶剤としては、酢酸エチル、酢酸イソプロピル、酢酸n-ブチル、酢酸イソブチル、酢酸アミル、乳酸エチル、炭酸ジメチル等が挙げられる。
ケトン系溶剤としては、アセトン、メチルエチルケトン、メチルイソブチルケトンベンゼン、ジイソブチルケトン、ジアセトンアルコール、イソホロン、シクロヘキサンノン等が挙げられる。
グリコールエーテル系溶剤としては、エチレングリコールモノエチルエーテル、エチレングリコールモノイソプロピルエーテル、エチレングリコールモノブチルエーテル等、これらモノエーテル類の酢酸エステル、ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコ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等や、これらモノエーテル類の酢酸エステル等が挙げられる。
脂肪族系溶剤としては、n-ヘプタン、n-ヘキサン、シクロヘキサン、メチルシクロヘキサン、エチルシクロヘキサン等が挙げられる。
芳香族系溶剤としては、トルエン、キシレン、テトラリン等が挙げられる。
また、基材フィルムとして、ポリエチレンテレフタレート、ポリエチレンナフタレートのポリエステルフィルム、ポリカーボネート、ポリエーテルサルホン、アクリル樹脂等の高分子フィルム上にITO層をスパッタリング、ウェットコート等により形成したいわゆるITOフィルム、ITO層をガラス上に形成したITOガラス等を用いてもよい。また、セラミック、ガラス基材等も用いることができる。特にタッチスクリーンパネルにおいては、ポリエスエルフィルム上にITO層を形成したITOフィルム、ガラス上にITO層を形成したITOガラスが多く用いられる。
スクリーン版の種類としては、ポリエステルスクリーン、コンビネーションスクリーン、メタルスクリーン、ナイロンスクリーン等が挙げられる。また、高粘度なペースト状態のものを印刷する場合は、高張力ステンレススクリーンを使用することができる。
スクリーン印刷のスキージは丸形、長方形、正方形いずれの形状であっても良く、またアタック角度(印刷時の版とスキージの角度)を小さくするために研磨スキージも使用することができる。その他の印刷条件等は従来公知の条件を適宜設計すればよい。
硬化剤を含有しない場合は、溶剤の十分な揮発のため、また、硬化剤を含有する場合は、溶剤の十分な揮発および硬化剤とエポキシ樹脂との反応のために、加熱温度は80~230℃、加熱時間としては10~120分が好ましい。これにより、導電パターン付き積層体を得ることができる。導電パターン付き積層体は、必要に応じて、導電パターンを被覆するように、絶縁層を設けることができる。絶縁層としては、特に限定されず、公知の絶縁層を適用することができる。また、導電パターン付き積層体は、他の層に形成された導電膜と電気的に接続する構成とすることができる。例えば、ITO膜等の透明導電層と本発明に係る導電性インキから形成した導電パターンとを当接させて電気的に接続する構成とすることができる。
ここで、本発明の導電性インキを抵抗膜方式のタッチスクリーンパネルに適用した場合の一例を図1及び図2を用いつつ説明する。なお、本図1、2は抵抗膜式タッチスクリーンパネルの簡易的な概念図であり、配線の本数、配線幅、配線と配線の間隔は概念図として表している。なお、図2では、三層の中間、粘着材5の位置に視点を置き、下部基板1側は見下ろす状態で、上部基板2側は見上げる状態で各基板側の積層状態を模式的に示した。
そして、下部基板1上の透明電極6の両端部には、導電性インキパターン層3からなる下側駆動電極13,14がそれぞれ形成されている。導電性インキ層3は、絶縁層4によって被覆されている。導電性インキパターン層3は、図1に示すように、基材1、ITO等の透明電極6、そして絶縁層4に接する。
同様に上部基板2上の透明導電7の両端部にも、導電性インキ層3からなる上部駆動電極9,10がそれぞれ形成されている。
そして、本来の目的である入力の時以外に透明電極6、7とが接触しないように、一定の間隔(例えば、10~150μmの間隔)を開け(図1参照)、下部基板1側の絶縁層4と上部基板2、下部基板1と上部基板2、下部基板1と上部基板2側の絶縁層4が、それぞれ粘着材5により貼り合わされ、積層される。粘着材5は、額縁状に配置することができる。また、図2に示されるように、下部基板1側の駆動電極13,14と、前記上部基板2側の上側駆動電極9,10とは、平面視上において直交するように形成され得る。
更に、前記上部基板2側の駆動電極9,10には、接続電極11,12がそれぞれ導電性接着剤で接続されている。同様に、前記下部基板1側の駆動電極13,14には、接続電極15,16に導電性接着剤でそれぞれ接続されている。
本願発明に係る導電性インキによれば、数平均分子量(Mn)が10,000~300,000であり、水酸基価が2~300(mgKOH/g)のエポキシ樹脂を用い、かつ、そのエポキシ樹脂100重量部に対し、0.2~20重量部の金属キレートを含有し、さらに、貯蔵弾性率(G')を5,000~50,000(Pa)の範囲とすることにより、高精細なパターン印刷を行うことができる。これは、上記範囲の貯蔵弾性率(G')を用いることにより、小さな導電性粒子を用いつつも、スクリーン印刷版を通過し、基材に転移した後のインキの広がりを抑制できるようになるためである。本発明者らが鋭意検討を重ねた結果、上記特定のエポキシ樹脂を用い、かつ、上記配合比の金属キレートを用いることにより、上記特定の範囲の貯蔵弾性率(G')に容易に調整できることがわかった。
ジャパンエポキシレジン社製、JER1256(重量平均分子量が57,400,数平均分子量が25,000、エポキシ当量が7,500、水酸基価が190)40部をイソホロン60部に溶解し、不揮発分40%のバインダー(1)溶液を得た。
ジャパンエポキシレジン社製、JER4250(重量平均分子量が57,600、数平均分子量が24,000、エポキシ当量が8,500、水酸基価が180)40部をイソホロン60部に溶解し、不揮発分40%のバインダー(2)溶液を得た。
ジャパンエポキシレジン社製、JER1009(重量平均分子量が27,700、数平均分子量が5,200、エポキシ当量が2,500、水酸基価が220)40部をイソホロン60部に溶解し、不揮発分40%のバインダー(3)溶液を得た。
攪拌機、温度計、コンデンサー、窒素ガス導入管を備えた反応装置に、数平均分子量380、エポキシ当量190のビスフェノールA液状エポキシ樹脂100部、水酸基当量114のビスフェノールA59.1部(エポキシ基/水酸基モル比1.015)、ジエチレングリコールモノエチルエーテルアセテート106部を入れた。窒素気流下、100℃に加熱し溶解・均一化した後、触媒として50重量%のテトラメチルアンモニウムクロライド水溶液0.9部を添加し、160℃に温度を上げ、160℃で7時間重合反応を行った。更にイソホロン132部を添加し、不揮発分40%のバインダー(4)溶液を得た。
なお、得られたエポキシ樹脂は固形分あたり、重量平均分子量が145,000、数平均分子量が54,000、エポキシ当量が16,500、水酸基価が194を有するものであった。
攪拌機、温度計、コンデンサー、窒素ガス導入管を備えた反応装置に、数平均分子量380、エポキシ当量190のビスフェノールA液状エポキシ樹脂100部、水酸基当量114のビスフェノールA57.6部(エポキシ基/水酸基モル比1.041)、ジエチレングリコールモノエチルエーテルアセテート105部を入れた。窒素気流下、100℃に加熱し溶解・均一化した後、触媒として50重量%のテトラメチルアンモニウムクロライド水溶液0.7部を添加し、160℃に温度を上げ、160℃で7時間重合反応を行った。更にイソホロン131部を添加し、不揮発分40%のバインダー(5)溶液を得た。
なお、得られたエポキシ樹脂は固形分あたり、重量平均分子量が51,600、数平均分子量が17,000、エポキシ当量が6,900、水酸基価が185を有するものであった。
攪拌機、温度計、コンデンサー、窒素ガス導入管を備えた反応装置に、数平均分子量380、エポキシ当量190のビスフェノールA液状エポキシ樹脂100部、水酸基当量114のビスフェノールA57.4部(エポキシ基/水酸基モル比1.045)、ジエチレングリコールモノエチルエーテルアセテート128部を入れた。窒素気流下、100℃に加熱し溶解・均一化した後、触媒としてトリプロピルアミン0.4部を添加し、160℃で7時間重合反応を行った。更に反応系内の温度を70℃に下げた後、フェニルイソシアネート35部、ジブチル錫ジラウレート0.04部を仕込み、100℃間で昇温後6時間反応させた。更にイソホロン161部を添加し、不揮発分40%のバインダー(6)溶液を得た。
なお、得られたエポキシ樹脂は固形分あたり、重量平均分子量が60,500、数平均分子量が27,000、エポキシ当量が8,800、水酸基価が92を有するものであった。
攪拌機、温度計、精留管、窒素ガス導入管、減圧装置を備えた反応装置にテレフタル酸ジメチル20.3部、イソフタル酸ジメチル20.3部、エチレングリコール12.9部、ネオペンチルグリコール18.2部、及びテトラブチルチタネート0.03部を仕込み、窒素気流下で攪拌しながら180℃まで徐々に加熱し、180℃で3時間エステル交換反応を行なった。ついで、セバシン酸28.3部を仕込み180~240℃まで徐々に加熱し、エステル化反応を行なった。240℃で2時間反応し、酸価を測定し、15以下になったら反応缶を徐々に1~2トールまで減圧し、所定の粘度に達した時、反応を停止し取り出し、重量平均分子量が52,900、数平均分子量が23,000、水酸基価が5、酸価が1のポリエステル樹脂を得た。ポリエステル樹脂40部をイソホロン60部に溶解し、不揮発分40%のバインダー(7)溶液を得た。
攪拌機、温度計、還流冷却管、窒素ガス導入管を備えた反応装置に、イソフタル酸と3-メチル-1,5ペンタンジオールとから得られるポリエステルポリオール((株)クラレ製「クラレポリオールP-2030」、Mn=2033)127.4部、ジメチロールブタン酸4.2部、イソホロンジイソシアネート19.2部、及びジエチレングリコールモノエチルエーテルアセテート32.5部を仕込み、窒素気流下にて90℃で3時間反応させ、ついでジエチレングリコールモノエチルエーテルアセテート115部を加えて、重量平均分子量が48,600、数平均分子量が18,000、水酸基価が4、酸価が10のポリウレタン樹脂の溶液を得た。ポリウレタン樹脂の溶液100部にイソホロン26部を加え、不揮発分40%のバインダー(8)溶液を得た。
装置:GPC(ゲルパーミッションクロマトグラフィー)
機種:昭和電工(株)製 Shodex GPC-101
カラム:昭和電工(株)製 GPC KF-G+KF805L+KF803L+KF8 02
検出器:示差屈折率検出器 昭和電工(株)製 Shodex RI-71
溶離液:THF
流量 :サンプル側:1mL/分、リファレンス側:0.5mL/分
温度 :40℃
サンプル:0.2%THF溶液(100μLインジェクション)
検量線:東ソー(株)製の下記の分子量の標準ポリスチレン12点を用いて検量線を作成した。
F128(1.09X106)、F80(7.06X105)、F40(4.27X105)、F20(1.90X105)、F10(9.64X104)、F4(3.79X104)、F2(1.81X104)、F1(1.02X104)、A5000(5.97X103)、A2500(2.63X103)、A1000(1.05X103)、A500(5.0X102)。
ベースライン:バインダー(3)以外は、GPC曲線の最初のピークの立ち上がり点を起点とし、リテンションタイム25分(分子量3,150)でピークが検出されなかったので、これを終点とした。そして、両点を結んだ線をベースラインとして、分子量を計算した。
バインダー(3)は、リテンションタイム25分にはまだ主たるピークが検出されていた。そこで、主たるピークの低分子量側に連続する複数の小さなピークがほぼ検出されなくなった、リテンションタイム30分(分子量250)を終点として、他のバインダーの場合と同様にベースラインを設定し、分子量を求めた。
JIS K 7236 に準拠して測定した。
<水酸基価、酸価の測定>
JIS K 0070 に準拠して測定した。
DOWAエレクトロニクス社製球状銀粉(タップ密度5.5g/cm3、D50粒子径0.9μm、比表面積0.93m2/g)を銀粉Aとした。
DOWAエレクトロニクス社製球状銀粉(タップ密度4.0g/cm3、D50粒子径0.5μm、比表面積1.77m2/g)を銀粉Bとした。
METALOR社製球状銀粉(タップ密度2.2g/cm3、D50粒子径0.8μm、比表面積1.40m2/g)を銀粉Cとした。
三井金属社製球状銀粉(タップ密度4.5g/cm3、D50粒子径0.25μm、比表面積1.70m2/g)を銀粉Dとした。
福田金属社製フレーク銀粉(タップ密度4.8g/cm3、D50粒子径7.9μm、比表面積0.95m2/g)を銀粉Eとした。
三井金属社製球状銀粉(タップ密度0.9g/cm3、D50粒子径5.1μm、比表面積1.91m2/g)を銀粉Fとした。
METALOR社製フレーク銀粉(タップ密度6.1g/cm3、D50粒子径15.3μm、比表面積0.09m2/g)を銀粉Gとした。
SINO-PLATINUM社製フレーク銀粉(タップ密度2.9g/cm3、D50粒子径5.2μm、比表面積5.60m2/g)を銀粉Hとした。
1)D50粒子径
島津製作所社製レーザー回折粒度分布測定装置「SALAD-3000」を用いて体積粒度分布の累積粒度(D50)を測定した。
2)タップ密度
JIS Z 2512:2006法に基づいて測定した。
3)BET比表面積
島津製作所製流動式比表面積測定装置「フローソーブII」を用いて測定した表面積より以下の計算式により算出した値を比表面積と定義し記載した。
比表面積(m2/g)=表面積(m2)/粉末質量(g)
アルミキレートとして、川研ファインケミカル株式会社製ALCH(一般式(1)、固形分90%)を金属キレートAとした。
チタンキレートとして、マツモトファインケミカル株式会社製オルガチックスTC-100(チタンアセチルアセトナート、固形分75%)を金属キレートBとした。
ジルコニウムキレートとして、マツモトファインケミカル株式会社製オルガチックスZC-540(ジルコニウムトリブトキシモノアセチルアセトネート、固形分45%)を金属キレートCとした。
ブロック型ヘキサメチレンジイソシアネート硬化剤、デュラネートMF-K60X(旭化成ケミカルズ社製、固形分60%)を硬化剤(1)とした。
[硬化剤2]
イミダゾール硬化剤、キュアダクトP-0505(四国化成社製、固形分100%)を硬化剤(2)とした。
40重量部のエポキシ樹脂を含むバインダー(1)溶液:100重量部と、0.81重量部のアルミニウムエチルアセトアセテートジイソプロピオネートを含む金属キレートA:0.9重量部、銀粉A:330重量部、ジエチレングリコールモノエチルエーテルアセテート:40重量部とをディスパーにて混合後、3本ロールにより分散し、導電性インキを調製した。
得られた導電性インキは、固形分が約79重量%であり、エポキシ樹脂と銀粉との合計370重量部中、銀粉は約89重量%、エポキシ樹脂は11重量%である。
そして、ティー・エイ・インスツルメント社製レーオメーター「AR-G2」を使用して、25℃の温度下で、周波数1Hzに固定し、振動応力1.0~10,0000Paの範囲で貯蔵弾性率G'等の動的粘弾性特性を測定したところ、実施例1の導電性インキの貯蔵弾性率G'は7,200、tanδは0.89であった。
表1、2に示す配合比率にて銀粉、バイダー樹脂溶液、金属キレート、硬化剤、溶剤をディスパーにて混合後、3本ロールにより分散し、実施例1と同様にして導電性インキを調製した。得られた導電性インキの特性を下記の方法で測定した。
厚さ75μmのコロナ処理したポリエチレンテレフタレートフィルム(以下、PETという)に実施例1~12、比較例1~9の導電性インキを、15mm×30mmのパターン形状にスクリーン印刷し、150℃オーブンにて30分乾燥させ、膜厚が8~10μmの導電性印刷物を得た。
上記印刷物の膜厚は、仙台ニコン社製MH-15M型測定器を用いて測定した。
上記印刷物の表面抵抗値は、25℃、湿度50%環境下にて三菱化学社製ロレスタAPMCP-T400測定器を用い、測定した。
上記方法で測定された表面抵抗値、および膜厚より、体積抵抗率を算出した。体積抵抗率の目標値は5.0×10-5Ω・cm以下である。なお、5.0×10-5Ω越え、8.0×10-5Ω・cm以下は、一応実用性があるが、8.0×10-5越えでは、通常、実用性がない。
体積抵抗率(Ω・cm)=(表面抵抗率:Ω/□)×(膜厚:cm)
ITO積層フィルム(日東電工社製、V270L-TEMP、75μm厚)の一部を塩酸でエッチングしてITO層を除去して基材(ポリエチレンテレフタレートフィルム)を露出させたものを用意した。そして、ITO積層部分およびエッチングして基材が露出した部分に、実施例1~9、比較例1~9の各導電性インキを、乾燥後の膜厚が8~10μmになるように15mm×30mmのパターンをスクリーン印刷し、150℃オーブンにて30分乾燥させ、この印刷物の密着性を評価した。評価方法および評価基準は下記の通りである。
ITO残存部分、ITOエッチング部分それぞれの領域上の導電インキ層に、幅1m間隔に10マスX10マスの計100マス目をカッターで入れ、ニチバン製セロハンテープ(25mm幅)を印刷面に貼り付け、急激に剥離し、残ったマス目の状態にて評価を行った。
○:剥離無し(密着性良好レベル)
△:マスの端がわずかに欠ける(密着性やや不良だが、実用上使用可能レベル)
×:1マス以上の剥離が観察される(密着性不良レベル)
ポリイミドフィルム(東レ・デュポン社製、カプトン100H、25μm厚)上に、実施例1~9、比較例1~9の各導電性インキを、乾燥後の膜厚が8~10μmになるように15mm×30mmのパターンをスクリーン印刷した。その後、180℃オーブンにて30分乾燥させ、この印刷物の密着性を評価した。評価方法および評価基準は下記の通りである。
ニチバン製セロハンテープ(25mm幅)を印刷物表面に貼り付け、急激に剥離し、印刷物の密着性を評価した。
○:剥離なく、密着性良好。
△:若干剥離有り、密着性やや不良。
×:全面剥離が有り、密着性不良。
高精度スクリーン印刷装置(東海精機株式会社製SERIA)を用いて、実施例1~9、比較例1~9の各導電性インキを、200mm×200mmの領域に、線幅40μm、線間の幅60μm(L/S=40μm/60μm)の微細配線パターンを多数有するスクリーン版にて、厚さ75μmのコロナ処理PETに20枚連続印刷した。その後、150℃で30分乾燥させた。印刷の条件は下記の通りである。
・スクリーン:ステンレス版650メッシュ
・乳剤厚:10μm
・スクリーン枠:650×550mm
・スキージ角度:70°
・スキージアタック角度:50°
・スキージ硬度:80°
・スキージ速度:20mm/秒
・スキージ印圧:10kg
・クリアランス:3.5mm
スクリーン印刷した配線パターンの微細配線部分を、デジタルマイクロスコープ(株式会社キーエンス社製VHX-900)を用いて倍率500倍で撮影した。撮影した拡大写真をニレコ社製小型汎用画像解析装置「LUZEX AP」を用いて印刷後の細線幅を読み取った。
具体的には、5枚目、20枚目の印刷物について、それぞれ任意の細線8本を選択し、1本につき460箇所、8本合計で3680箇所の線幅を測定し、最小値、最大値、平均値、標準偏差、細線の太りの度合い「(平均値-40μm)/40μm(%)」を求めた。
平均値、標準偏差、細線の太りの度合いを表1、2に示す。
なお、標準偏差は細線の直線性(細線の凸凹)を示す。
25%未満:線幅の太りがほとんど認められず、細線印刷性は良好
25~40%:線幅の太りがやや認められるが、細線印刷性は実用上差し支えの無いレベル
40%を越える:線幅の太りが認められ、細線印刷性は不良
○:微細配線部分は、蛇行による太さのばらつき、にじみ、掠れを生じておらず、微細配線部分の境界線が明瞭で良好であった。
△:微細配線部分は、蛇行による太さのばらつきが多少見られたが、にじみ、掠れを生じておらず、実用上差し支えの無いレベルであった。
×:微細配線部分は、蛇行による太さのばらつきが見られ、にじみ、掠れがあり、境界線が不明瞭であった。
透明導電性フィルムからなる可動電極基板とガラス電極基板からなる固定電極基板を両面テープによる両面粘着層で貼り合わせて、前述の図1及び図2に示す構成の抵抗膜式タッチスクリーンパネルを作製した。
図2の駆動電極、取り回し回路、接続電極を、実施例1~12、比較例1~9の導電性インキを用い、ITO透明電極膜部およびITOをエッチングにより除去した基材上にスクリーン印刷にて印刷を行い、135℃で30分乾燥させた。
次いで、上記駆動電極、取り回し回路上に、ポリウレタン樹脂系の絶縁レジスト(東洋インキ製造社製、リオレジストNSP-11)をスクリーン印刷にて印刷し、120℃で30分乾燥させた。完成した上下の電極基板を両面テープにて貼り合わせ、抵抗膜式タッチスクリーンパネルを作製した。なお、取り出し回路末端部は端子A、Bとするために、絶縁レジスト層を設けなかった(図示省略)。
○:環境保存試験後の端子間抵抗値の上昇率が0~10%
△:環境保存試験後の端子間抵抗値の上昇率が10~20%
×:環境保存試験後の端子間抵抗値の上昇率が20%を越える
環境保存試験後の端子間抵抗値の上昇率が20%以下は、標準仕様のタッチスクリーンパネルでは実用上問題のないレベルである。
硬化剤(1)を添加した実施例10は、ポリイミドフィルムへの密着性が向上する。更にタッチスクリーンパネルに使用した場合、高温高湿環境下に曝されても端子間抵抗の上昇が少なく良好である。
一方、硬化剤(2)を添加した実施例11、及び硬化剤(3)を添加した実施例12は、ポリイミドフィルムへの密着性は、硬化剤を加えない場合と同等であるが、細線印刷性の点で優れると共に、タッチスクリーンパネルに使用した場合、高温高湿環境下に曝されても端子間抵抗の上昇が少ないという点で優れている。
また、比較例2もバインダー樹脂がウレタン樹脂のため、抵抗値安定性が不良であった。
比較例3はバインダー樹脂がエポキシ樹脂であるが、数平均分子量が10,000未満のため抵抗値安定性が不良であり、また導電性インキの弾性成分が小さいため細線印刷性も劣る。
また、水酸基価が220(mgKOH/g)で、数平均分子量が5,200のエポキシ樹脂を用いた比較例3では、金属キレートを用いても貯蔵弾性率(G')は3,500であり、十分な貯蔵弾性率(G')が得られなかった。また、金属キレートを添加しない比較例9においては、貯蔵弾性率(G')が1,100と著しく低かった。そして、比較例9においては、高精細な印刷が得られなかった。
一方、比較例5は、用いた銀粉のD50粒子経が5μmを超えており、細線印刷性にて20枚印刷した時点で、細線の掠れがひどかったので、線幅を測定できなかった。印刷後のスクリーン印刷版のメッシュ部分を観察すると、多くの箇所でメッシュに銀粉が詰まっている状態が観察された。銀粉のD50粒子経大による不具合と考察される。
なお、実施例3と比較例9は、バインダー(1)溶液と銀粉Cを用い、金属キレートを含有するか否かの点だけが相違する。
測定機:東機産業製E型粘度計TVE-22H
ローター:コーン型ローター#7(θ3°、R7.7mm)
測定温度:25℃
サンプル量:0.1mL
回転数:2rpm、5rpm、20rpm
測定方法:銀ペーストサンプルを、1mLシリンジを用いて0.1mL測り取り、粘度計にセットする。1分放置後、2rpmにて2分間撹拌した後の粘度を測定する。その後、5rpm、20rpmにおいてそれぞれ2分間撹拌した後の粘度を測定する。
TI値は次の式により算出する。
TI=(2rpmの粘度)/(20rpmの粘度)
金属キレートを含有する実施例3の場合、2rpm:150Pas、5rpm:95Pas、20rpm:56Pasであり、TI値:2.68であった。
一方、金属キレートを含有しない比較例9の場合、2rpm:168Pas、5rpm:92Pas、20rpm:46Pasであり、TI値:3.66であった。
つまり、単なる粘度及びチキソ性の点では両者にさほど大きな違いはない。しかし、実施例3の貯蔵弾性率G'は6,100、比較例9の貯蔵弾性率G'は1,100であり、印刷性において全く異なる結果を示す。
また、本発明に係る導電性インキは、印刷用途のみならず、導電性接着剤用途、電磁波シールド材等に適用してもよい。
さらに、本発明に係る導電性インキを用いて形成した導電パターン付き積層体は、高湿度化における導電性変化が少ないので、印刷配線板用の導電性回路形成や、電子機器等に好適に用いることができる。
2:上部基板
3:導電性インキパターン層
4:絶縁層
5:粘着材(貼り合わせ)
6:下部基板の透明電極
7:上部基板の透明電極
8:ドットスペーサー
9,10:上部側駆動電極
11,12:上部側接続電極
13,14:下部側駆動電極
15,16:下部側接続電極
17:取り回し回路
Claims (21)
- タップ密度が1.0~10.0(g/cm3)、D50粒子径が0.3~5μm、BET比表面積0.3~5.0m2/gの導電性粒子と、
数平均分子量(Mn)が10,000~300,000であり、水酸基価2~300(mgKOH/g)のエポキシ樹脂と、
前記エポキシ樹脂中の水酸基とアルコール交換反応が可能であり、前記エポキシ樹脂100重量部に対して0.2~20重量部の金属キレートとを含有する、
貯蔵弾性率(G')が5,000~50,000(Pa)である導電性インキ。 - 前記導電性粒子が、銀であることを特徴とする、請求項1記載の導電性インキ。
- 前記エポキシ樹脂が、ビスフェノール型エポキシ樹脂である、請求項1又は2記載の導電性インキ。
- 前記エポキシ樹脂の数平均分子量(Mn)が15,000~100,000である、請求項1~3いずれか1項に記載の導電性インキ。
- 前記エポキシ樹脂の数平均分子量(Mn)が20,000~100,000であり、前記水酸基価が50~250(mgKOH/g)である、請求項1~4いずれか1項に記載の導電性インキ。
- 前記導電性粒子のタップ密度が2.0~10.0(g/cm3)である、請求項1~5いずれか1項に記載の導電性インキ。
- 前記金属キレートは、前記エポキシ樹脂100重量部に対して、2~10重量部含有する、請求項1~6いずれか1項に記載の導電性インキ。
- 貯蔵弾性率(G')が5,000~20,000(Pa)である、請求項1~7いずれか1項に記載の導電性インキ。
- 前記エポキシ樹脂の有する水酸基又はエポキシ基の少なくともいずれか一方と反応し得る官能基を有する硬化剤をさらに含有する、請求項1~8いずれか1項に記載の導電性インキ。
- スクリーン印刷用であることを特徴とする請求項1~9いずれか1項に記載の導電性インキ。
- 前記金属キレートがアルミニウムキレートであることを特徴とする、請求項1~10いずれか1項に記載の導電性インキ。
- 前記エポキシ樹脂100重量部に対して、0.5重量部~50重量部の前記硬化剤を含有する、請求項9に記載の導電性インキ。
- 前記硬化剤が、イソシアネート化合物、アミン化合物、酸無水物化合物、メルカプト化合物、イミダゾール化合物、ジシアンジアミド化合物、有機酸ヒドラジド化合物からなる群より選ばれる一種以上である、請求項9又は12記載の導電性インキ。
- 前記アルミニウムキレートが、アセチルアセトネート基、メチルアセトアセトネート基およびエチルアセトアセトネート基からなる群より選ばれる基を有することを特徴とする、請求項11記載の導電性インキ。
- 基材と、
前記基材上に形成された導電パターンと、を具備し、
前記導電パターンが、請求項1~14いずれか1項に記載の導電性インキにより形成されている導電パターン付き積層体。 - 前記導電パターンを被覆するように積層された絶縁層をさらに具備する、請求項15記載の導電パターン付き積層体。
- 前記導電パターンの下層側で、前記導電パターンと電気的に接続された所定のパターンを有する他の導電膜が、前記基材上にさらに形成されている、請求項15又は16に記載の導電パターン付き積層体。
- 前記他の導電膜が、錫がドープされた酸化インジウムを主成分とする透明導電膜である、請求項15~17のいずれか1項に記載の導電パターン付き積層体。
- タッチスクリーンパネル用途に用いられる、請求項15~18のいずれか1項に記載の導電パターン付き積層体。
- 基材上に所望のパターン形状の導電パターンをスクリーン印刷により形成する工程を備え、
前記導電パターンは、請求項1~14のいずれか1項に記載の導電性インキを用いる導電パターン付き積層体の製造方法。 - 基材上に、部分的に露出するように所定のパターンの透明導電膜を形成する工程と、
前記基材および前記透明導電膜の上に、請求項1~14のいずれか1項に記載の導電性インキを用いてスクリーン印刷により所望の形状の導電パターンを形成する工程と、
前記基材、前記透明導電膜および前記導電パターンの上に、絶縁層を形成する工程とを具備し、
前記透明導電膜は、錫がドープされた酸化インジウムを主成分とする膜である導電パターン付き積層体の製造方法。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020117013766A KR101118962B1 (ko) | 2010-02-05 | 2011-02-03 | 도전성 잉크 및, 도전 패턴을 갖는 적층체와 그 제조 방법 |
| CN201180001752.4A CN102395634B (zh) | 2010-02-05 | 2011-02-03 | 导电性油墨、及具有导电图案的积层体及其制造方法 |
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010023964 | 2010-02-05 | ||
| JP2010-023964 | 2010-02-05 | ||
| JP2010103992 | 2010-04-28 | ||
| JP2010-103992 | 2010-04-28 | ||
| JP2010-106202 | 2010-05-06 | ||
| JP2010106202 | 2010-05-06 | ||
| JP2010276401A JP4702499B1 (ja) | 2010-02-05 | 2010-12-10 | 導電性インキ、および導電パターン付き積層体とその製造方法 |
| JP2010-276401 | 2010-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011096222A1 true WO2011096222A1 (ja) | 2011-08-11 |
Family
ID=44237084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2011/000615 Ceased WO2011096222A1 (ja) | 2010-02-05 | 2011-02-03 | 導電性インキ、および導電パターン付き積層体とその製造方法 |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP4702499B1 (ja) |
| KR (1) | KR101118962B1 (ja) |
| CN (1) | CN102395634B (ja) |
| TW (1) | TW201127913A (ja) |
| WO (1) | WO2011096222A1 (ja) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014107157A (ja) * | 2012-11-28 | 2014-06-09 | Sumitomo Metal Mining Co Ltd | 導電性樹脂ペースト及びそれを用いた電子素子 |
| JP2014120382A (ja) * | 2012-12-18 | 2014-06-30 | Sumitomo Metal Mining Co Ltd | 導電性樹脂ペースト及びそれを用いた電子素子 |
| CN103996424A (zh) * | 2014-04-16 | 2014-08-20 | 池州市华硕电子科技有限公司 | 一种耐磨印刷电路板银浆及其制备方法 |
| CN104761957A (zh) * | 2015-03-04 | 2015-07-08 | 深圳广恒威科技有限公司 | 透明导电油墨、其制备方法及透明导电膜的生产方法 |
| JP2016183335A (ja) * | 2015-03-26 | 2016-10-20 | 東洋インキScホールディングス株式会社 | 導電性接着剤、導電性接着シートおよび電磁波シールドシート |
| WO2020149976A1 (en) * | 2019-01-18 | 2020-07-23 | Henkel IP & Holding GmbH | Stretchable electrically conductive ink compositions |
| JP2020113662A (ja) * | 2019-01-11 | 2020-07-27 | Jx金属株式会社 | 導電性塗布材料 |
| CN112819125A (zh) * | 2021-01-27 | 2021-05-18 | 北京印刷学院 | 一种导电油墨、rfid织物标签及其制备方法 |
| CN114390424A (zh) * | 2021-09-02 | 2022-04-22 | 苏州清听声学科技有限公司 | 一种定向发声屏绝缘层丝印制作方法 |
Families Citing this family (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI578099B (zh) * | 2012-02-09 | 2017-04-11 | 大阪曹達股份有限公司 | 含有金屬微粒子之光硬化性樹脂組成物及其利用 |
| JP5605516B2 (ja) * | 2012-03-29 | 2014-10-15 | Dic株式会社 | 導電性インキ組成物、導電性パターンの製造方法及び導電性回路 |
| JP5995192B2 (ja) * | 2012-05-25 | 2016-09-21 | 株式会社大阪ソーダ | 導電性インク組成物 |
| KR102007129B1 (ko) * | 2012-07-20 | 2019-08-02 | 도요보 가부시키가이샤 | 레이저 에칭 가공용 도전성 페이스트, 도전성 박막 및 도전성 적층체 |
| EP2733759A1 (en) * | 2012-11-15 | 2014-05-21 | Heraeus Precious Metals GmbH & Co. KG | Multi-layer composite with metal-organic layer |
| CN103146259B (zh) * | 2013-03-20 | 2015-07-15 | 中国人民解放军国防科学技术大学 | 丝网印刷导电油墨组合物及其制备方法 |
| CN103146260B (zh) * | 2013-03-20 | 2015-04-29 | 中国人民解放军国防科学技术大学 | 导电油墨组合物、导电膜层及其制备方法和应用 |
| WO2015085534A1 (en) * | 2013-12-12 | 2015-06-18 | Ablestik (Shanghai) Limited | Electrically conductive inks |
| CN103275559B (zh) * | 2013-06-09 | 2014-07-23 | 张宇 | 一种rfid印刷用导电油墨及其制备方法 |
| CN106415735B (zh) * | 2014-01-22 | 2018-04-10 | 东洋纺株式会社 | 激光蚀刻加工用导电浆料、导电性薄膜、导电性层叠体 |
| KR102312236B1 (ko) * | 2014-01-22 | 2021-10-14 | 도요보 가부시키가이샤 | 레이저 에칭 가공용 도전성 페이스트, 도전성 박막, 도전성 적층체 |
| CN106029266B (zh) * | 2014-03-28 | 2021-02-19 | 东洋铝株式会社 | 薄片状金属颜料及其制造方法,及其金属组合物和涂布物 |
| KR20160043867A (ko) | 2014-10-14 | 2016-04-22 | 삼성전자주식회사 | 엑스선 검출기 및 엑스선 검출기의 제조방법 |
| JP6157440B2 (ja) * | 2014-11-19 | 2017-07-05 | 株式会社ノリタケカンパニーリミテド | 加熱硬化型導電性ペースト |
| TWI534131B (zh) | 2014-11-27 | 2016-05-21 | 財團法人工業技術研究院 | 氫化4,4’-二胺基二苯甲烷的觸媒與方法 |
| CN107384023A (zh) * | 2015-01-27 | 2017-11-24 | 帝国油墨制造股份公司 | 丝网印刷用油墨组合物、印刷物及印刷物的制造方法 |
| JP6263146B2 (ja) * | 2015-04-06 | 2018-01-17 | 株式会社ノリタケカンパニーリミテド | 導電膜付基板、その製造方法、およびポリイミド基板用導電性ペースト |
| JP5974144B2 (ja) * | 2015-07-03 | 2016-08-23 | 尾池工業株式会社 | 導電性微粉末および導電性微粉末分散液の製造方法 |
| CN105405490A (zh) * | 2015-12-23 | 2016-03-16 | 东洋油墨Sc控股株式会社 | 激光加工用导电性糊、导电性片材、信号布线的制造方法及电子设备 |
| TWI632219B (zh) * | 2016-09-06 | 2018-08-11 | 東莞爵士先進電子應用材料有限公司 | Conductive tape and preparation method thereof |
| WO2018092762A1 (ja) * | 2016-11-21 | 2018-05-24 | 東洋紡株式会社 | 導電性ペースト、導電性膜、導電性膜の製造方法、導電性微細配線、導電性微細配線の製造方法。 |
| CN106590173A (zh) * | 2016-12-01 | 2017-04-26 | 南京大学 | 可低温固化的纳米金属墨水及其制备方法和应用 |
| CN106634215A (zh) * | 2016-12-01 | 2017-05-10 | 南京大学 | 用于柔性电子器件的纳米铟墨水及其制备方法和应用 |
| JP6982625B2 (ja) * | 2017-10-02 | 2021-12-17 | リンテック株式会社 | 焼成材料組成物、フィルム状焼成材料の製造方法、及び支持シート付フィルム状焼成材料の製造方法 |
| JP6521138B1 (ja) | 2018-04-19 | 2019-05-29 | 東洋インキScホールディングス株式会社 | 成形フィルム用導電性組成物、成形フィルム、成形体およびその製造方法 |
| JP6984904B2 (ja) * | 2019-10-02 | 2021-12-22 | 尾池工業株式会社 | 鱗片状複合粒子及びその製造方法、インク、塗膜、並びに印刷物 |
| KR102806383B1 (ko) * | 2019-11-08 | 2025-05-12 | 주식회사 케이씨씨 | 잉크 조성물 |
| JP7631765B2 (ja) * | 2020-12-03 | 2025-02-19 | artience株式会社 | 成形フィルム用導電性組成物、成形フィルム、及びその製造方法、並びに、成形体及びその製造方法 |
| KR20230145159A (ko) * | 2021-03-08 | 2023-10-17 | 도와 일렉트로닉스 가부시키가이샤 | 플레이크상 은 분말 및 그 제조 방법, 그리고 도전성 페이스트 |
| JP7185795B2 (ja) * | 2021-03-10 | 2022-12-07 | Dowaエレクトロニクス株式会社 | 銀粉及びその製造方法 |
| WO2022191001A1 (ja) * | 2021-03-10 | 2022-09-15 | Dowaエレクトロニクス株式会社 | 銀粉及びその製造方法 |
| CN116419477A (zh) * | 2021-12-30 | 2023-07-11 | 北京梦之墨科技有限公司 | 一种可直焊的金属复合油墨、制备方法及电子器件 |
| KR20250057000A (ko) * | 2022-09-01 | 2025-04-28 | 타츠타 전선 주식회사 | 도전성 도료, 및 차폐층을 가지는 수지 성형품의 제조 방법 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62127368A (ja) * | 1985-11-28 | 1987-06-09 | Dainippon Ink & Chem Inc | 乾式平版印刷用インキ |
| JP2001234106A (ja) * | 2000-02-25 | 2001-08-28 | Dainippon Printing Co Ltd | 導体インキ |
| JP2004090512A (ja) * | 2002-09-02 | 2004-03-25 | Konica Minolta Holdings Inc | 印刷方法、平版印刷版の作製方法、印刷装置およびその制御方法 |
| JP2008138193A (ja) * | 2006-11-08 | 2008-06-19 | Toyo Ink Mfg Co Ltd | 高輝度鏡面スクリーンインキおよび該インキを用いてなる印刷物 |
| JP2009209346A (ja) * | 2008-02-08 | 2009-09-17 | Toyo Ink Mfg Co Ltd | 導電性インキ |
| JP2009231059A (ja) * | 2008-03-24 | 2009-10-08 | Dowa Electronics Materials Co Ltd | オフセット印刷用導電性インクおよびそれを用いた回路パターン形成方法 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0855720A3 (en) * | 1997-01-28 | 1999-02-10 | Sumitomo Bakelite Company Limited | Electroconductive copper paste composition |
| JP4734687B2 (ja) * | 2000-01-26 | 2011-07-27 | 住友ベークライト株式会社 | 半導体用樹脂ペースト及びそれを用いた半導体装置 |
-
2010
- 2010-12-10 JP JP2010276401A patent/JP4702499B1/ja active Active
- 2010-12-13 TW TW99143427A patent/TW201127913A/zh unknown
-
2011
- 2011-02-03 CN CN201180001752.4A patent/CN102395634B/zh active Active
- 2011-02-03 KR KR1020117013766A patent/KR101118962B1/ko active Active
- 2011-02-03 WO PCT/JP2011/000615 patent/WO2011096222A1/ja not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62127368A (ja) * | 1985-11-28 | 1987-06-09 | Dainippon Ink & Chem Inc | 乾式平版印刷用インキ |
| JP2001234106A (ja) * | 2000-02-25 | 2001-08-28 | Dainippon Printing Co Ltd | 導体インキ |
| JP2004090512A (ja) * | 2002-09-02 | 2004-03-25 | Konica Minolta Holdings Inc | 印刷方法、平版印刷版の作製方法、印刷装置およびその制御方法 |
| JP2008138193A (ja) * | 2006-11-08 | 2008-06-19 | Toyo Ink Mfg Co Ltd | 高輝度鏡面スクリーンインキおよび該インキを用いてなる印刷物 |
| JP2009209346A (ja) * | 2008-02-08 | 2009-09-17 | Toyo Ink Mfg Co Ltd | 導電性インキ |
| JP2009231059A (ja) * | 2008-03-24 | 2009-10-08 | Dowa Electronics Materials Co Ltd | オフセット印刷用導電性インクおよびそれを用いた回路パターン形成方法 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014107157A (ja) * | 2012-11-28 | 2014-06-09 | Sumitomo Metal Mining Co Ltd | 導電性樹脂ペースト及びそれを用いた電子素子 |
| JP2014120382A (ja) * | 2012-12-18 | 2014-06-30 | Sumitomo Metal Mining Co Ltd | 導電性樹脂ペースト及びそれを用いた電子素子 |
| CN103996424A (zh) * | 2014-04-16 | 2014-08-20 | 池州市华硕电子科技有限公司 | 一种耐磨印刷电路板银浆及其制备方法 |
| CN104761957A (zh) * | 2015-03-04 | 2015-07-08 | 深圳广恒威科技有限公司 | 透明导电油墨、其制备方法及透明导电膜的生产方法 |
| JP2016183335A (ja) * | 2015-03-26 | 2016-10-20 | 東洋インキScホールディングス株式会社 | 導電性接着剤、導電性接着シートおよび電磁波シールドシート |
| JP2020113662A (ja) * | 2019-01-11 | 2020-07-27 | Jx金属株式会社 | 導電性塗布材料 |
| WO2020149976A1 (en) * | 2019-01-18 | 2020-07-23 | Henkel IP & Holding GmbH | Stretchable electrically conductive ink compositions |
| CN112819125A (zh) * | 2021-01-27 | 2021-05-18 | 北京印刷学院 | 一种导电油墨、rfid织物标签及其制备方法 |
| CN114390424A (zh) * | 2021-09-02 | 2022-04-22 | 苏州清听声学科技有限公司 | 一种定向发声屏绝缘层丝印制作方法 |
| CN114390424B (zh) * | 2021-09-02 | 2023-10-31 | 苏州清听声学科技有限公司 | 一种定向发声屏绝缘层丝印制作方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4702499B1 (ja) | 2011-06-15 |
| TWI354690B (ja) | 2011-12-21 |
| CN102395634B (zh) | 2015-05-13 |
| KR101118962B1 (ko) | 2012-04-16 |
| KR20110110119A (ko) | 2011-10-06 |
| CN102395634A (zh) | 2012-03-28 |
| JP2011252140A (ja) | 2011-12-15 |
| TW201127913A (en) | 2011-08-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4702499B1 (ja) | 導電性インキ、および導電パターン付き積層体とその製造方法 | |
| JP5146567B2 (ja) | 導電性インキ、および導電パターン付き積層体とその製造方法 | |
| JP5699447B2 (ja) | 導電性インキ | |
| CN106085274B (zh) | 导电性粘合剂、导电性粘合片及配线元件 | |
| JP5854248B1 (ja) | 導電性接着剤、ならびにそれを用いた導電性接着シートおよび電磁波シールドシート | |
| TWI648748B (zh) | Conductive paste, conductive coating film, electrical circuit, conductive laminate, and touch panel | |
| JP2012253172A (ja) | 導電性回路の製造方法 | |
| KR20150109406A (ko) | 도전성 페이스트, 도전성 막, 전기 회로 및 터치 패널 | |
| TWI596172B (zh) | Conductive liquid composition | |
| JP6303367B2 (ja) | 導電性ペースト、導電性膜及びタッチパネル | |
| JP6343903B2 (ja) | 導電性ペースト及びこれを用いた印刷回路 | |
| CN111512398B (zh) | 导电性浆料 | |
| JP6135687B2 (ja) | レーザー加工用導電性ペースト | |
| JP6094642B2 (ja) | レーザー加工用導電性ペースト | |
| WO2017018427A1 (ja) | 導電フィルムの製造方法及び導電フィルム | |
| JP7561809B2 (ja) | 電磁波シールドシート、プリント配線板、並びに電子機器 | |
| JP5907305B1 (ja) | レーザー加工用導電性ペースト | |
| JP6682938B2 (ja) | 導電性ペースト | |
| JP2006059720A (ja) | 導電性ペースト及びタッチパネル | |
| JP2005133056A (ja) | ポリマー型導電性ペースト | |
| JP6705346B2 (ja) | レーザー加工用導電性ペースト | |
| JP2005174797A (ja) | ポリマー型導電性ペースト |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WWE | Wipo information: entry into national phase |
Ref document number: 201180001752.4 Country of ref document: CN |
|
| ENP | Entry into the national phase |
Ref document number: 20117013766 Country of ref document: KR Kind code of ref document: A |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11739571 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 11739571 Country of ref document: EP Kind code of ref document: A1 |