JP2021082465A - Method for manufacturing electrically conductive material - Google Patents

Abstract

To provide a method for manufacturing electrically conductive material excellent in temporal stability.SOLUTION: A method for manufacturing electrically conductive material is provided that includes processing an electrically conductive peripheral metal portion having at least a light transmissive electrically conductive layer and an electrically conductive peripheral metal portion on a support with post processing liquid containing at least a water-insoluble resin water dispersion, hydroxybenzenes and cyclic secondary amines.SELECTED DRAWING: None

Description

The present invention relates to a method for producing a conductive material, which can obtain a conductive material having excellent stability over time.

In electronic devices such as smartphones, personal digital assistants (PDAs), notebook PCs, tablet PCs, OA devices, medical devices, and car navigation systems, touch panel sensors are widely used as input means for these displays.

The touch panel sensor includes an optical method, an ultrasonic method, a resistance film method, a surface type capacitance method, a projection type capacitance method, etc. depending on the position detection method, and the resistance film method and the projection type are used in the above-mentioned display applications. The capacitance method is preferably used. The resistive touch panel sensor has a structure in which two conductive materials having a light-transmitting conductive layer on a support are used and these conductive materials are arranged facing each other via a dot spacer. By applying a force to the points, the light-transmitting conductive layers come into contact with each other, and the voltage applied to each light-transmitting conductive layer is measured through the other light-transmitting conductive layer, so that the position where the force is applied is measured. It is for detection. On the other hand, the projection type capacitance type touch panel sensor uses one conductive material having two light-transmitting conductive layers or two conductive materials having one light-transmitting conductive layer, and uses a finger or the like. The change in capacitance between the light-transmitting conductive layers when the touch panel is brought close to the device is detected, and the position where the finger is brought close to the touch panel is detected. The latter has excellent durability because it has no moving parts, and is particularly widely used in smartphones, tablet PCs, etc. because it can detect multiple points at the same time. Usually, the light-transmitting conductive layer is located on the display, and in the prior art, the light-transmitting conductive layer is generally formed of an ITO (indium tin oxide) conductive film.

In a projection-type capacitance type touch panel sensor, by arranging a sensor unit having a plurality of sensors formed by patterning a light-transmitting conductive layer on a support, simultaneous detection of multiple points and movement points can be performed. Enables detection. In order to take out the change in capacitance detected by this sensor part as an electric signal to the outside, a terminal part having a plurality of terminals provided for taking out an electric signal to the outside for all sensors, or a sensor part and a terminal A conductive peripheral metal portion such as a peripheral wiring portion having a plurality of peripheral wirings that electrically connect the portions is provided. Normally, the conductive peripheral metal portion is located outside the display, that is, the so-called frame portion, and in the prior art, the conductive peripheral metal portion is formed of a metal having a low electrical resistivity such as gold, silver, copper, nickel, and aluminum. Is common.

For example, Japanese Patent Application Laid-Open No. 2012-138018 (Patent Document 1) uses a conductive oxide such as ITO or IZO (indium tin oxide) as a material for the light-transmitting conductive layer, and uses an extraction wiring (peripheral wiring portion) and the like. A touch panel in which a conductive peripheral metal portion such as a connection terminal (terminal portion) is formed by using a metal material such as a metal or an alloy is disclosed.

In recent years, a conductive material in which a light-transmitting conductive layer is formed of a mesh-like fine metal wire pattern and a conductive peripheral metal portion is formed of the same metal as the mesh-like metal fine wire pattern has also been disclosed. For example, Japanese Patent Application Laid-Open No. 2017-33369 (Patent Document 2) describes a method of using a silver salt photosensitive material, a method of printing a conductive ink, and a method of resisting a mesh-like fine metal line pattern and a conductive peripheral metal portion on a metal layer. It is described that the same metal can be formed by various methods such as a method of providing a layer, forming a resist pattern, and then etching and removing the metal layer.

On the other hand, when the above-mentioned conductive material is used for manufacturing a touch panel sensor, for example, a pressure-sensitive adhesive layer and a functional material are provided on a surface having a light-transmitting conductive layer and a conductive peripheral metal portion to provide a conductive material laminate. Is known to be. For example, Japanese Patent Application Laid-Open No. 2014-198811 (Patent Document 3) discloses a pressure-sensitive adhesive layer made of an adhesive sheet on a touch panel sensor and a laminated body for a touch panel having a protective substrate (functional material) on the pressure-sensitive adhesive layer. There is.

However, due to the need to connect a wiring member such as a flexible printed wiring board that is responsible for electrical connection with the outside to the conductive peripheral metal portion, a part of the metal portion is connected to the conductive peripheral metal portion from the adhesive layer. It is necessary to provide an exposed exposed metal part. In such a case, even after the wiring member is connected, the exposed metal portion is not completely covered, and a part thereof continues to be exposed. Therefore, the protection of the exposed metal part becomes insufficient, the resistance value of the exposed metal part changes over a long period of time, and the change in capacitance detected by the sensor part cannot be normally taken out as an electric signal. was there. As a result, the reliability of the touch panel sensor may be significantly reduced due to a decrease in the detection sensitivity of the touch panel sensor or an erroneous recognition. That is, there has been a demand for a conductive material having more excellent stability over time.

Japanese Unexamined Patent Publication No. 2012-234695 (Patent Document 4) discloses a method of arranging a binder portion containing a polymer latex between conductive metal silver fine wires as a transparent conductive sheet having excellent migration resistance. Japanese Patent Application Laid-Open No. 5 (Patent Document 5) discloses a method of treating a conductive material with a cationic emulsion as a method for producing a conductive material in which fluctuations in resistance value due to irradiation with sunlight are improved, but this is sufficiently satisfactory. It wasn't a thing.

On the other hand, Japanese Patent Application Laid-Open No. 01-259591 (Patent Document 6) prints hydroquinone, pyrogallol, etc. as an example of a method for preventing migration that occurs when a voltage is applied between insulated metals in the presence of moisture. The method of adding to the paint applied to the wiring board is described. Further, Japanese Patent Application Laid-Open No. 2012-131895 (Patent Document 7) describes a method of adding an alkanolamine or the like to a copper ink in order to prevent oxidation of copper in the production of an electrically conductive portion by applying a conductive copper ink. be written. Further, Japanese Patent Application Laid-Open No. 2012-6050 (Patent Document 8) describes a method of imparting rust prevention to a metal portion of a semiconductor element by adding a cyclic secondary amine such as morpholine or piperazine to a cleaning agent for the semiconductor element. Will be done.

Japanese Unexamined Patent Publication No. 2012-138018 JP-A-2017-333369 Japanese Unexamined Patent Publication No. 2014-198811 Japanese Unexamined Patent Publication No. 2012-234695 Japanese Unexamined Patent Publication No. 2019-12311 Japanese Unexamined Patent Publication No. 01-259591 Japanese Unexamined Patent Publication No. 2012-131895 Japanese Unexamined Patent Publication No. 2012-6050

An object of the present invention is to provide a method for producing a conductive material, which can obtain a conductive material having excellent stability over time.

The above object of the present invention is achieved by the following invention.
The conductive peripheral metal portion of the conductive material having at least a light-transmitting conductive layer and a conductive peripheral metal portion on the support contains at least a water-insoluble resin aqueous dispersion, hydroxybenzenes, and cyclic secondary amines. A method for producing a conductive material, which comprises treating with a post-treatment liquid.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method for producing a conductive material, which can obtain a conductive material having excellent stability over time.

Schematic diagram of the positive transparent original used in the examples

Hereinafter, the present invention will be described. In the method for producing a conductive material of the present invention, a conductive peripheral metal portion of a conductive material having at least a light-transmitting conductive layer and a conductive peripheral metal portion on a support is formed of a water-insoluble resin aqueous dispersion, hydroxybenzenes, and the like. It is characterized by treating with a post-treatment liquid containing at least cyclic secondary amines.

<Post-treatment liquid>
The post-treatment liquid of the present invention contains at least a water-insoluble resin aqueous dispersion, hydroxybenzenes, and cyclic secondary amines.

The water-insoluble resin aqueous dispersion contained in the post-treatment liquid of the present invention will be described. In the present invention, the water-insoluble resin aqueous dispersion means an emulsion in which the water-insoluble resin is emulsified or dispersed in an aqueous dispersion medium, and specific examples of the water-insoluble resin include acrylic resin and the like. Examples thereof include polyurethane resin, polyester resin, polyamide resin, polyimide resin, polyallylamine resin, polyolefin resin, phenol resin, epoxy resin, phenoxy resin, urea resin, melamine resin, alkyd resin, formaldehyde resin, silicone resin, and fluororesin. .. The post-treatment liquid of the present invention may contain these water-insoluble resins alone, may contain two or more kinds, and may further contain a complex of two or more kinds of water-insoluble resins. .. Among the above, polyurethane resin, polyolefin resin, and acrylic resin are preferable because a conductive material having excellent temporal stability can be obtained, and polyurethane resin is particularly preferable because a conductive material having excellent temporal stability can be obtained.

The average particle size of the water-insoluble resin contained in the water-insoluble resin aqueous dispersion is not particularly limited, but is preferably 500 nm or less. Although the post-treatment of the present invention is performed on the conductive peripheral metal portion, it is complicated to perform the post-treatment only on the conductive peripheral metal portion, and the light-transmitting conductive layer may be post-treated at the same time. It is simple and desirable, but in such a case, it is preferable because a conductive material having a light-transmitting conductive layer having a low haze can be obtained. From such a viewpoint, the average particle size of the water-insoluble resin is more preferably 300 nm or less, and particularly preferably 200 nm or less. The lower limit is preferably 1 nm or more. The average particle size in the present invention is a value measured by a dynamic light scattering method and obtained by analysis by a cumulant method. Examples of the average particle size measuring device include a light scattering photometer DLS-7000 manufactured by Otsuka Electronics Co., Ltd. and a laser particle size analyzer PAR-III.

The aqueous dispersion medium contained in the water-insoluble resin aqueous dispersion means a dispersion medium containing at least water, and since the water-insoluble resin has excellent dispersion stability, the total amount of water in the dispersion medium is 40% by mass or more. The contained dispersion medium is preferably 50% by mass or more, and particularly preferably 60% by mass or more. Examples of the dispersion medium that can be contained in addition to water include hydrophilic organic solvents, alcohols such as methanol, ethanol, propanol and benzyl alcohol, polyhydric alcohols such as ethylene glycol, propylene glycol, polyethylene glycol and glycerin, and triethylene. Examples thereof include glycol ethers such as glycol monobutyl ether and polyethylene glycol monomethyl ether.

A commercially available product can be used as the water-insoluble resin aqueous dispersion. For example, as commercially available products of the polyurethane resin aqueous dispersion preferably used in the present invention, for example, Superflex (registered trademark) 170, 210, 420, 820 and the like commercially available from Daiichi Kogyo Seiyaku Co., Ltd., DIC ( Hydran (registered trademark) AP-40N, WLS-201, APX-101H, etc., which are commercially available from Sumitomo Seika Co., Ltd., can be mentioned. Zyxen (registered trademark) AC, AC-HW-10, NC, etc., Hardlen (registered trademark) NZ-1004, NZ-1015, etc. marketed by Toyobo Co., Ltd., marketed by Unitika Co., Ltd. Arrow base (registered trademark) SB-1200, SD-1200 and the like can be mentioned, and Nipol (registered trademark) SX1707A and the like commercially available from Nippon Zeon Co., Ltd. can be mentioned as the acrylic resin dispersion. These can be obtained and used.

The hydroxybenzenes contained in the post-treatment liquid of the present invention mean a compound having one or more hydroxy groups on the benzene ring, and the number of hydroxy groups, the position of substitution of the hydroxy group, the presence or absence of other substituents, etc. There is no particular limitation. Specific examples include aminophenols such as 2-aminophenol, 3-aminophenol, and 4-aminophenol, hydroxyacetanilides such as 2'-hydroxyacetanilide, 3'-hydroxyacetanilide, and 4'-hydroxyacetanilide, and catechol. Polys such as hydroquinone, 4-methylcatechol, resorcinol, chlorohydroquinone, 4-chlororesorcinol, 4-chlorocatechol, 4-nitrocatechol, 2-nitroresorcinol, 4-nitroresorcinol, orcinol, pyrogallol, propyl carpentate, and carious acid. Examples thereof include hydroxybenzenes. Hydroxybenzenes may be used alone or in combination of two or more. Among the above, polyhydroxybenzenes are preferable because a conductive material having particularly excellent temporal stability can be obtained, and catechol and hydroquinone are preferable because a conductive material having particularly excellent temporal stability can be obtained.

The cyclic secondary amines contained in the post-treatment liquid of the present invention have a saturated cyclic structure containing nitrogen atoms, of which two carbon atoms and one hydrogen atom are bonded to one or more nitrogen atoms. .. Further, one or more hydrogen atoms are bonded to the carbon atom bonded to the nitrogen atom satisfying the above conditions, and the presence or absence of other substituents, heteroatoms and the like is not particularly limited. Specific examples of the cyclic secondary amine include pyrrolidine, piperidine, hexamethyleneimine, morpholine, thiomorpholine, piperazine, 4-hydroxypiperidine and the like. The cyclic secondary amines may be used alone or in combination of two or more.

The content of the water-insoluble resin aqueous dispersion, hydroxybenzenes, and cyclic secondary amines contained in the post-treatment liquid of the present invention is not particularly limited, but the solid content of each is preferably 0.5 g / L or more. , More preferably 2.0 g / L or more. The upper limit of these components is preferably 30 g / L or less.

The pH of the post-treatment liquid of the present invention is not particularly limited, but is preferably 4 to 9 from the viewpoint of the dispersion stability of the water-insoluble resin aqueous dispersion and the temporal stability of hydroxybenzenes. For pH adjustment, the post-treatment liquid may contain a pH adjusting agent such as hydrochloric acid, sulfuric acid, acetic acid, sodium hydroxide, potassium hydroxide, phosphate, carbonate and the like. Further, the post-treatment liquid in the present invention may contain known additives such as a surfactant, an antifoaming agent, an antifoaming agent, a thickener, and an antiseptic, in addition to the pH adjuster, if necessary.

<Treatment with post-treatment liquid>
The method of treating the conductive peripheral metal portion of the conductive material, which will be described later, with the post-treatment liquid is not particularly limited, and the post-treatment liquid may be brought into contact with the conductive peripheral metal portion of the conductive material. Specifically, known methods such as a method of immersing the conductive material in a post-treatment liquid, a bar coating method, a spin coating method, a die coating method, a blade coating method, a gravure coating method, a curtain coating method, a spray coating method, and a kiss coating method are known. Known printing such as a method of applying a post-treatment liquid on a conductive peripheral metal part of a conductive material by a coating method, gravure printing, flexo printing, inkjet printing, screen printing, offset printing, gravure offset printing, dispenser printing, pad printing, etc. An example of a method of printing a post-treatment liquid on a conductive peripheral metal portion of a conductive material can be exemplified. Among the above methods, the method of immersing the conductive material in the post-treatment liquid is preferable because it is simple and a conductive material having excellent stability over time can be easily obtained.

The time for contacting the post-treatment liquid with the conductive peripheral metal portion of the conductive material is not particularly limited, but is preferably 1 second or longer, more preferably 3 seconds or longer, and particularly preferably 5 seconds or longer. The upper limit is preferably 10 minutes or less. The temperature of the post-treatment liquid when the post-treatment liquid is brought into contact with the conductive peripheral metal portion of the conductive material is not particularly limited, but is preferably 5 ° C. or higher, more preferably 10 ° C. or higher. The upper limit is preferably 70 ° C. or lower.

After the treatment with the post-treatment liquid, a film containing a water-insoluble resin aqueous dispersion, hydroxybenzenes, and cyclic secondary amines can be formed on the surface of the conductive peripheral metal portion, so that the film is not washed with water. Drying is preferable, and as such a drying method, known drying methods such as hot air drying, infrared drying, and natural drying can be exemplified.

<Conductive material>
The material of the support provided by the conductive material in the present invention is not particularly limited, but when the conductive material is used for applications that require light transmission such as a touch panel sensor, it is particularly preferable that the support has light transmission. Examples of the light-transmitting support include polyolefin resins such as polyethylene and polypropylene, vinyl chloride resins such as polyvinyl chloride and vinyl chloride copolymers, epoxy resins, polyarylates, polysulfone, polyether sulfone, and polyimides. Various resin films such as fluororesin, phenoxy resin, triacetyl cellulose, polyethylene terephthalate, polyimide, polyphenylene sulfide, polyethylene naphthalate, polycarbonate, acrylic resin, cellophane, nylon, polystyrene resin, ABS resin, quartz glass, non-alkali glass Etc. can be exemplified. The total light transmittance of the support is preferably 60% or more, particularly preferably 70% or more, and the haze of the support is preferably 0 to 3%, particularly preferably 0 to 2%. .. The support has an easy-adhesion layer, a hard coat layer, an antireflection layer, an antiglare layer, and an ITO on the surface having the light-transmitting conductive layer and the surface opposite to the surface having the light-transmitting conductive layer. It may have a known layer such as a layer containing a non-metallic conductive material such as polythiophene or polythiophene.

When the conductive material in the present invention is used for the touch panel sensor, the conductive peripheral metal portion of the conductive material includes a plurality of terminals provided for extracting the change in capacitance detected by the sensor portion to the outside as an electric signal. Examples thereof include a terminal portion having a terminal portion and a peripheral wiring portion having a plurality of peripheral wirings that electrically connect the sensor portion and the terminal portion. The metal type contained in the conductive peripheral metal portion is not limited, and examples thereof include known metals such as gold, silver, copper, aluminum, and nickel, and alloys made of known metals. However, containing silver or copper is conductive. It is preferable because it has excellent properties, and it is particularly preferable that it contains silver. The metal content of the conductive peripheral metal portion is preferably 50% by mass or more because of its excellent conductivity, more preferably 70% by mass or more, and particularly preferably 80% by mass or more.

The amount of metal in the conductive peripheral metal portion is not particularly limited, but if the amount of metal is too large, the conductive peripheral metal portion becomes thick and the effect of the present invention may be insufficient. Further, if the amount of metal is too small, the conductivity may be insufficient. Thus the metal content of the conductive peripheral metal portion is preferably 0.2~10.0g / ^{m 2,} more preferably 0.3~7.0g / ^{m 2,} particularly preferably 0.4 to It is 5.0 g / m ² . The amount of metal in the conductive peripheral metal part is determined by cutting out a part of the metal part to make a measurement sample and measuring the abundance (g) of metal in the measurement sample by fluorescent X-ray. It can be calculated by dividing by the area (m ^{2) of only the existing part.}

When the conductive material of the present invention is used for the touch panel sensor, it is preferable that the conductive peripheral metal portion has an exposed metal portion in which at least a part thereof is exposed from the adhesive layer described later. The exposed metal portion is suitable for connecting a wiring member such as a flexible printed wiring board which is electrically connected to the outside to the conductive peripheral metal portion, and therefore the exposed metal portion is preferably a terminal portion. The terminal portion generally has a plurality of terminals, and the width of the terminals is not particularly limited, but 15 μm or more is preferable from the viewpoint of the temporal stability of the conductive material, and more preferably 30 μm or more. Particularly preferably, it is 60 μm or more. Although the upper limit is not particularly limited, the width of the terminal is preferably 2000 μm or less in order to suppress the mounting area of the wiring member and reduce the size of the member. The distance between the terminals is not particularly limited, but it is preferably 10 μm or more from the viewpoint of insulation. It is preferable that the upper limit of the distance between the terminals is 2000 μm or less because the mounting area can be suppressed.

The line width of the conductive peripheral metal portion other than the exposed metal portion is not particularly limited, but it is preferably 3 μm or more because the conductivity of the conductive peripheral metal portion is excellent, preferably 5 μm or more, and particularly preferably 7 μm. That is all. The upper limit is preferably 2000 μm or less because the area of the so-called frame portion can be suppressed. The distance between the conductive peripheral metal portions other than the exposed metal portion is not particularly limited, but it is preferably 1 μm or more from the viewpoint of insulation between the conductive peripheral metal portions. It is preferable that the upper limit of the distance between the conductive peripheral metal portions other than the exposed metal portion is 2000 μm or less because the area of the frame portion can be suppressed.

In the present invention, the method for forming the conductive peripheral metal portion on the support is not particularly limited, and for example, a conductive metal ink containing a metal and a binder or conductive according to the method disclosed in JP-A-2015-69877. A silver halide emulsion layer is provided on the support according to a method of applying the paste onto the support by a method such as printing to form a conductive peripheral metal portion or a method disclosed in Japanese Patent Application Laid-Open No. 2007-59270. According to a method of forming a conductive peripheral metal portion by using a silver salt photosensitive material as a conductive material precursor and a curing and developing method, and a method disclosed in JP-A-2004-221564, JP-A-2007-12314 and the like. , A method of forming a conductive peripheral metal portion by using a silver salt photosensitive material having a silver halide emulsion layer on a support as a conductive material precursor and using a direct development method, JP-A-2003-77350, JP. Silver having a physically developed nuclear layer and a silver halide emulsion layer on a support in this order according to the methods disclosed in JP-A-2005-250169, JP-A-2007-188655, JP-A-2004-207001, etc. A method of forming a conductive peripheral metal portion by using a so-called silver salt diffusion transfer method in which a salt-sensitive material is used as a conductive material precursor and a soluble silver salt forming agent and a reducing agent are allowed to act in an alkaline solution. According to the method disclosed in Japanese Patent Application Laid-Open No. 197531, a base layer and a photosensitive resist layer are laminated on a support, the photosensitive resist layer is exposed in an arbitrary pattern, developed, and a resist image is formed, and then electroless. A method of localizing a metal on an underlayer that is not covered with a resist image by plating and then removing the resist image to form a conductive peripheral metal portion is disclosed in Japanese Patent Application Laid-Open No. 2015-82178. According to the method, a metal film and a resist film are provided on the support, the resist film is exposed and developed to form an opening, and the metal film of the opening is etched and removed to form a conductive peripheral metal portion. The method of doing this can be exemplified.

Among the methods for forming the conductive peripheral metal portion described above, since the conductive peripheral metal portion containing silver having excellent conductivity can be easily formed, the conductive peripheral metal portion is formed by using a conductive metal ink or a conductive paste. A method of forming a conductive peripheral metal portion by using a silver salt photosensitive material as a conductive material precursor is particularly preferable.

In the present invention, the conductive peripheral metal portion may be subjected to a known metal surface treatment prior to the treatment with the post-treatment liquid. For example, a reducing substance, a water-soluble phosphoric acid compound, or a water-soluble halogen compound as described in JP-A-2008-34366 may be allowed to act, as described in JP-A-2013-196779. Triazine having two or more mercapto groups or a derivative thereof may be allowed to act in the molecule, and blackening treatment by a sulfurization reaction may be performed as described in JP-A-2011-209626. Further, when a conductive peripheral metal portion is formed by using a silver salt photosensitive material as a conductive material precursor, as described in JP-A-2007-12404 for the purpose of further improving the effect of the present invention. The conductive material may be treated with a treatment solution containing an enzyme such as a proteolytic enzyme to reduce residual gelatin and the like.

The light-transmitting conductive layer included in the conductive material of the present invention will be described. When the conductive material of the present invention is used for a touch panel sensor, the light-transmitting conductive layer preferably has a sensor portion having a plurality of sensors electrically insulated from each other. The configuration of the sensor portion is not particularly limited, and may be a mesh-like fine metal wire pattern formed according to the method for forming the conductive peripheral metal portion described above, which is described in JP-A-2009-215594 and the like. It may be a layer containing a metal nanowire, and may be a conductive metal oxide such as ITO (indium tin oxide), IZO (indium zinc oxide), ZnO (zinc oxide), polythiophene, polyacetylene, polypyrrole, polyaniline, etc. It may be a non-metallic conductive film formed of a conductive polymer, graphene, or the like.

When the application of the conductive material in the present invention is a touch panel sensor and the sensor portion has a mesh-like metal fine line pattern, the mesh-like metal fine line pattern may have a geometric shape in which a plurality of unit lattices are arranged in a mesh pattern. It is preferable from the viewpoint of sensor sensitivity, visibility (difficult visibility), and the like. The shape of the unit cell includes, for example, a triangle such as an equilateral triangle, an isosceles triangle, and a right-angled triangle, a square, a rectangle, a rhombus, a parallelogram, a quadrangle such as a trapezoid, a hexagon, an octagon, a dodecagon, and a hexagon. Examples of shapes include a combination of n-sided triangles, star shapes, and the like, and examples thereof include a single repetition of these shapes or a combination of two or more types of a plurality of shapes. Of these, the shape of the unit cell is preferably square or rhombus. An irregular geometric shape represented by a Voronoi diagram, a Delaunay diagram, a Penrose tile diagram, or the like is also one of the preferred mesh-like metal fine line patterns.

From the viewpoint of visibility (difficulty in visibility), the line width of the fine metal wires constituting the mesh-like fine metal wire pattern is preferably 20 μm or less, and more preferably 1 to 10 μm. Further, in constructing the mesh-like pattern, it is preferable that the repetition interval of the unit cell is 50 to 600 μm from the viewpoint of the sensitivity and visibility of the sensor. The aperture ratio of the mesh-like fine metal wire pattern is preferably 85% or more because the conductive material of the present invention is excellent in transparency, and more preferably 88 to 99%.

A functional material can be provided on the surface of the conductive material obtained by the present invention on the side having the mesh-like fine metal wire pattern or the surface on the other side via an adhesive layer to form a conductive material laminate. Examples of the pressure-sensitive adhesive layer include layers containing known pressure-sensitive adhesives such as rubber-based pressure-sensitive adhesives, acrylic-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, and urethane-based pressure-sensitive adhesives. The thickness of the pressure-sensitive adhesive layer is preferably 5 to 500 μm because a conductive material laminate having excellent transparency can be obtained, and more preferably 10 to 250 μm. From the same viewpoint, the total light transmittance of the pressure-sensitive adhesive layer is preferably 90% or more, particularly preferably 95% or more, and the haze of the pressure-sensitive adhesive layer is preferably 0 to 3%, particularly preferably 0 to 0. It is 2%.

The pressure-sensitive adhesive layer includes an optical pressure-sensitive adhesive tape using a highly transparent acrylic pressure-sensitive adhesive exemplified in JP-A-9-251159 and JP-A-2011-74308, and JP-A-2009-48214. It may be formed by using a cured product of a highly transparent curable resin exemplified in JP-A-2010-257208. Both optical adhesive tapes and highly transparent curable resins are commercially available. The former is a highly transparent adhesive transfer tape (8146-1 / 8146-2 / 8146-3 / 8146-) from 3M Japan Ltd. 4 etc.), Nitto Denko Co., Ltd. can exemplify transparent adhesive sheets for optics (LUCIACS (registered trademark) CS9864UAS / CS9864UA, etc.), and the latter is the optical elastic resin SVR (registered trademark) series (SVR1150) from Dexerials Co., Ltd. , SVR1320, etc.), WORLD ROCK (registered trademark) series (HRJ (registered trademark) -46, HRJ-203, etc.) from Kyoritsu Chemical Industry Co., Ltd., UV curable optical transparent adhesive Loctite (from Henkel Japan Ltd.) Registered trademark) LOCA series (Loctite 3192, Loctite 3193, etc.) and the like can be exemplified, and these can be obtained and used.

Examples of the functional material laminated via the above-mentioned pressure-sensitive adhesive layer include the above-mentioned conductive material having a light-transmitting conductive layer, chemically strengthened glass, soda glass, quartz glass, glass such as non-alkali glass, and polyethylene terephthalate. Examples thereof include films containing various resins, and materials having known functional layers such as a hard coat layer, an antireflection layer, an antiglare layer, a polarizing layer, and an ITO conductive film on at least one surface of the above-mentioned glass or film. ..

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples as long as the gist of the present invention is not exceeded.

The following post-treatment liquids 1 to 17 were prepared. The pH of each post-treatment liquid was adjusted to 8.0.

<Preparation of post-treatment liquid 1>
Superflex 170 (solid content conversion) 10g
(Polyurethane resin aqueous dispersion manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., average particle size 10 nm)
Catechol 10g
Emargen® LS-114 2g
(Nonion-based surfactant manufactured by Kao Corporation)
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 2>
Superflex 170 (solid content conversion) 10g
Catechol 10g
Morpholine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 3>
Superflex 170 (solid content conversion) 10g
Catechol 10g
Morpholine 5g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 4>
Superflex 170 (solid content conversion) 10g
Catechol 10g
Morpholine 20g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 5>
Superflex 170 (solid content conversion) 10g
Catechol 10g
4-Hydroxypiperidine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 6>
Superflex 170 (solid content conversion) 10g
Catechol 10g
Piperidine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 7>
Superflex 170 (solid content conversion) 10g
Hydroquinone 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 8>
Superflex 170 (solid content conversion) 10g
Hydroquinone 10g
Morpholine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 9>
Superflex 170 (solid content conversion) 10g
Hydroquinone 10g
4-Hydroxypiperidine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 10>
Superflex 170 (solid content conversion) 10g
Hydroquinone 10g
Piperidine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 11>
Superflex 170 (solid content conversion) 10g
4-Aminophenol 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 12>
Superflex 170 (solid content conversion) 10g
4-Aminophenol 10g
Morpholine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 13>
Superflex 170 (solid content conversion) 10g
4'-Hydroxyacetanilide 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 14>
Superflex 170 (solid content conversion) 10g
4'-Hydroxyacetanilide 10g
Morpholine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 15>
Superflex 170 (solid content conversion) 10g
Morpholine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 16>
Seixen AC (solid content conversion) 10g
(Sumitomo Seika Chemical Co., Ltd. polyolefin resin aqueous dispersion, particle size less than 200 nm)
Catechol 10g
Morpholine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Preparation of post-treatment liquid 17>
Nipol SX1707A (solid content conversion) 10g
(Acrylic resin aqueous dispersion manufactured by Nippon Zeon Corporation, average particle size 109 nm)
Catechol 10g
Morpholine 10g
Emargen LS-114 2g
The total volume was adjusted to 1000 mL with water.

<Manufacturing of conductive material 1>
As a support, a polyethylene terephthalate film having a thickness of 100 μm was used. When the total light transmittance and haze of the support were measured with a haze meter HZ-V3 manufactured by Suga Test Instruments Co., Ltd., the total light transmittance was 92.1% and the haze was 0.5%.

Next, the physically developed nuclear layer coating liquid having the following composition was uniformly applied onto the support by gravure coating and dried to provide the physically developed nuclear layer.

<Preparation of palladium sulfide sol>
Solution A Palladium chloride 5 g
Hydrochloric acid 40 mL
Distilled water 1000mL
Solution B Sodium sulfide 8.6 g
Distilled water 1000mL
Liquid A and liquid B were mixed with stirring, and after 30 minutes, they were passed through a column filled with an ion exchange resin to obtain a palladium sulfide sol.

<Physical development nuclear lamina coating liquid / per ^{1m 2>}
Palladium sulfide sol (as solid content) 0.4 mg
2% by mass glyoxal aqueous solution 200 mg
Surfactant (S-1) 4 mg
Denacol® EX-830 25 mg
(Polyethylene glycol diglycidyl ether manufactured by Nagase ChemteX Corporation)
10% by mass Epomin® SP-200 aqueous solution 500 mg
(Polyethyleneimine manufactured by Nippon Shokubai Co., Ltd .; average molecular weight 10,000)

Subsequently, the intermediate layer, the silver halide emulsion layer, and the protective layer having the following compositions are uniformly applied on the physically developed nuclear layer by slide coating in order from the one closest to the support, and dried to obtain the conductive material precursor. Obtained. The silver halide emulsion contained in the silver halide emulsion layer was produced by a controlled double jet method. The silver halide particles contained in this silver halide emulsion were prepared to have an average particle size of 0.15 μm with 95 mol% of silver chloride and 5 mol% of silver bromide. The silver halide particles thus obtained were sensitized with gold sulfur using sodium thiosulfate and chloroauric acid according to a conventional method. The silver halide emulsion thus obtained contains 0.5 g of gelatin per 1 g of silver as a protective colloid (binder).

<Intermediate layer composition / per ^{1 m 2>}
Gelatin 0.5g
Surfactant (S-1) 5 mg
Dye 15 mg

<Silver halide emulsion layer composition / per ^{1 m 2>}
Silver halide emulsion 3.0g Silver equivalent 1-Phenyl-5-mercaptotetrazole 3mg
Surfactant (S-1) 20 mg

<Protective layer composition / per ^{1 m 2>}
Gelatin 1g
Amorphous silica matting agent (average particle size 3.5 μm) 10 mg
Surfactant (S-1) 10 mg

The conductive material precursor obtained as described above and the positive transmissive document shown in FIG. 1 were brought into close contact with each other and exposed through a resin filter that cuts light of 400 nm or less with a close contact printer using a mercury lamp as a light source. .. The positive type transparent original includes a sensor corresponding part 11 (4 pieces of 11a to 11d), a peripheral wiring equivalent part 12 (4 pieces of 12a to 12d), and a peripheral wiring corresponding part 12'(4 pieces of 12a' to 12d'). It has a terminal corresponding portion 13 (4 pieces of 13a to 13d) and a terminal corresponding part 13'(4 pieces of 13a' to 13d'). The sensor equivalent portion 11 is formed by a mesh pattern formed by a diamond-shaped unit lattice having a line width of 4.5 μm, a side length of 300 μm, and a narrow angle of 60 °, and peripheral wiring equivalent portions 12, 12 ', Terminal corresponding parts 13, 13' are all solid patterns (filled patterns). The line widths of the peripheral wiring equivalent portions 12 and 12'are all 40 μm, and the shortest distance between adjacent peripheral wiring equivalent portions is 40 μm. The widths of the terminal corresponding portions 13 and 13'are 500 μm, and the shortest distance between adjacent terminal corresponding portions is 500 μm. In the figure, the broken line represents the bonding region 21 of the functional material described later, and the broken line does not exist on the positive type transparent original.

Then, the exposed conductive material precursor was immersed in the following diffusion transfer developer at 20 ° C. for 60 seconds, and then the silver halide emulsion layer, the intermediate layer, and the protective layer were washed and removed with warm water at 40 ° C. , Dryed. In this way, a sensor portion having a plurality of sensors (corresponding to the light transmissive conductive layer in the present invention), a peripheral wiring portion having a plurality of peripheral wirings, and a conductive material 1 having a terminal portion having a plurality of terminals were obtained. When the obtained conductive material 1 was observed with a digital microscope, the shape and line width of the pattern were the same as those of the positive transmissive document described above. As a result of measurement by fluorescent X-ray analysis, the amount of metal in the light-transmitting conductive layer and the conductive peripheral metal portion was 1.0 g / m ² .

<Diffusion transfer developer composition>
Potassium hydroxide 25g
Hydroquinone 18g
1-Phenyl-3-pyrazolidone 2g
Potassium sulfite 80g
N-Methylethanolamine 15g
Potassium bromide 1.2g
The total volume was adjusted to 1000 mL with water and pH = 12.2.

<Manufacturing of conductive material 2>
The conductive material 1 was immersed in the post-treatment liquid 1 at 20 ° C. for 60 seconds and then dried to obtain the conductive material 2.

<Manufacturing of conductive material 3>
The conductive material 3 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 2 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 4>
The conductive material 4 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 3 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 5>
The conductive material 5 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 4 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 6>
The conductive material 6 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 5 was used instead of the post-treatment liquid 1.

<Manufacturing of conductive material 7>
The conductive material 7 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 6 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 8>
The conductive material 8 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 7 was used instead of the post-treatment liquid 1.

<Manufacturing of conductive material 9>
The conductive material 9 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 8 was used instead of the post-treatment liquid 1.

<Manufacturing of conductive material 10>
The conductive material 10 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 9 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 11>
The conductive material 11 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 10 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 12>
The conductive material 12 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 11 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 13>
The conductive material 13 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 12 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 14>
The conductive material 14 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 13 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 15>
The conductive material 15 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 14 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 16>
The conductive material 16 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 15 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 17>
A conductive material 17 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 16 was used instead of the post-treatment liquid 1.

<Preparation of conductive material 18>
The conductive material 18 was obtained in the same manner as the conductive material 2 except that the post-treatment liquid 17 was used instead of the post-treatment liquid 1.

<Manufacturing of conductive material laminate>
For each of the conductive materials 1 to 18, a highly transparent adhesive transfer tape 8146-4 manufactured by 3M Japan Ltd. is bonded to the bonding area 21 of the functional material, and an adhesive layer having a thickness of 100 μm (total light transmittance 99%) is bonded. As mentioned above, the haze was 0.4%). Subsequently, EAGLE XG (registered trademark) (non-alkali glass manufactured by Corning Japan Co., Ltd.) was bonded onto the pressure-sensitive adhesive layer as a functional material to prepare conductive material laminates 1 to 18. The same procedure was repeated to prepare 30 conductive material laminates 1 to 18 each. Part of the terminal portion of the conductive material laminates 1 to 18 is exposed from the pressure-sensitive adhesive layer, and this portion corresponds to the exposed metal portion in the present invention.

<Number of laminated bodies that have changed over time>
For each of the 30 sheets of the conductive material laminates 1 to 18 obtained as described above, between the left and right terminals (between 13a-13a'and 13d-13d' in the positive transmission original) which are electrically conductive by design. The resistance values of (4 sets corresponding to) were measured using a digital multimeter PC700 manufactured by Sanwa Electric Instrument Co., Ltd., and used as initial resistance values (R ^{0 a to R 0} d). Next, a shielding exposure test (natural ventilation type) according to JIS Z 2381: 2017 was carried out for 3 months. After the test, the resistance values between the left and right terminals that are electrically conductive by design were measured for all the conductive material laminates, and used as the post-test resistance values (Ra to Rd). Then, the resistance value change rate (unit:%) between the terminals was calculated according to the following formula. When the resistance value change rate exceeded ± 5% even in one set among the four sets of terminals, it was judged that the conductive material laminate had changed with time. Table 1 shows the number of laminates that have changed over time in each of the 30 conductive material laminates 1-18. The resistance value between the left and right terminals was measured by strongly pressing the tip of the lead rod against the end of each terminal and penetrating the film.
Resistance value change rate between terminals (unit:%) = {(Rx-R ⁰ x) / R ⁰ x} x 100
In the formula, x represents a to d.

From the results in Table 1, it can be seen that a conductive material having excellent stability over time can be obtained by the above-mentioned method for producing a conductive material.

11 Sensor equivalents 12, 12'Peripheral wiring equivalents 13, 13'Terminal equivalents 21 Functional material bonding area

Claims (1)

The conductive peripheral metal portion of the conductive material having at least a light-transmitting conductive layer and a conductive peripheral metal portion on the support contains at least a water-insoluble resin aqueous dispersion, hydroxybenzenes, and cyclic secondary amines. A method for producing a conductive material, which comprises treating with a post-treatment liquid.

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