JPWO2016208371A1 - Conductive laminate, molded body using the same, capacitive touch sensor and planar heating element, and method for manufacturing molded body - Google Patents

Abstract

A change in surface resistance after molding and an increase in haze are suppressed, and a conductive laminate excellent in durability under high temperature and high humidity is provided. A conductive laminate having a nanocarbon layer and an overcoat layer in this order on at least one of the substrates, and the surface resistance value change rate after 100% stretching of the conductive laminate obtained by the following formula (1) ( R) is 500% or less, and the haze (Hz1) after 100% stretching of the conductive laminate is 3% or less. R = (R1 / R0) × 100 Formula (1) (In the formula, R is the rate of change in surface resistance after 100% stretching, R0 is the surface resistance value before stretching, and R1 is the surface after 100% stretching. Represents resistance value.)

Description

  The present invention relates to a conductive laminate. More specifically, the present invention relates to a conductive laminate in which changes in surface resistance and haze after molding (increase) are suppressed and durability is excellent under high temperature and high humidity.

  Conventionally, conductive laminates are used in various products such as touch panel applications, electronic paper applications, and digital signage applications. As a conductive material used for these conductive laminates, indium tin oxide (hereinafter sometimes referred to as ITO), silver nanowire (hereinafter sometimes referred to as AgNW), carbon nanotube (hereinafter referred to as CNT). In some cases, conductive polymers are used. In the applications described above, the necessity of molding the conductive laminate has not been so much so far.

  In the future, a three-dimensional touch panel will be required from the viewpoint of operability and design. However, a conductive film using ITO or AgNW, which is the mainstream as a conductive material, has poor flexibility and is not suitable for molding processing. In other words, a conductive film using ITO or AgNW has a function as a conductive laminate because the conductive film is cracked or the conductive material is torn after molding, and the surface resistance value is greatly increased. There is concern about the decline.

  Therefore, in order to suppress an increase in the surface resistance value after molding, a conductive laminate using CNT that is highly flexible and advantageous for molding is being studied.

  For example, Patent Document 1 proposes a conductive laminate using a CNT having excellent bending resistance as a conductive film. Patent Document 2 proposes a moldable conductive film for molding with improved CNT dispersibility as an antistatic treatment application for preventing static electricity generated in a molded synthetic resin molded product and preventing dust from adhering to it. Has been. Patent Document 3 proposes a heating element characterized by the moldability of CNTs.

JP 2012-66580 A JP 2006-35772 A JP 2010-45014 A

  For example, when the conductive laminate is applied to a molding process such as a touch sensor having a curved shape or a planar heating element, the rate of change in surface resistance after molding is relatively small, and haze increases after molding. Smallness and high durability under high temperature and high humidity are required. However, the conductive laminate disclosed in the above-mentioned patent document does not sufficiently satisfy the above characteristics.

  Accordingly, in view of the above problems, an object of the present invention is to provide a conductive laminate that is excellent in durability under high temperature and high humidity conditions, in which changes in surface resistance after molding and an increase in haze are suppressed.

The above object of the present invention is achieved by the following invention.
[1] A conductive laminate having a nanocarbon layer and an overcoat layer in this order on at least one of the substrates, and the rate of change in surface resistance after 100% stretching of the conductive laminate obtained by the following formula (1) A conductive laminate in which (R) is 500% or less and the haze (Hz ₁ ) after 100% stretching of the conductive laminate is 3% or less.

R = (R ₁ / R ₀ ) × 100 (1)
(In the formula, R represents the rate of change in surface resistance after 100% stretching, R ₀ represents the surface resistance value before stretching, and R ₁ represents the surface resistance value after 100% stretching.)
[2] The conductive laminate according to [1], wherein the overcoat layer includes a thermosetting resin or an active energy ray curable resin.
[3] The conductive laminate according to [2], wherein the active energy ray curable resin is an ultraviolet curable resin.
[4] The conductive laminate according to any one of [1] to [3], wherein the overcoat layer includes a urethane acrylate resin.
[5] The conductive laminate according to any one of [1] to [4], wherein the overcoat layer includes a urethane acrylate resin and a polyfunctional acrylic resin.
[6] The conductive laminate according to any one of [1] to [3], wherein the base material includes at least one resin selected from the group consisting of a polycarbonate resin, an acrylic resin, and a cyclic olefin resin.
[7] The conductive laminate according to any one of [1] to [6], which has an undercoat layer between the substrate and the nanocarbon layer, and the undercoat layer contains a thermoplastic resin.
[8] The conductive laminate according to [7], wherein the undercoat layer further contains particles.
[9] The conductive laminate according to [7] or [8], wherein the thermoplastic resin is a urethane resin.
[10] The conductive laminate according to [8] or [9], wherein the particles are silica particles.
[11] The conductive laminate according to any one of [1] to [10], wherein the haze (Hz ₀ ) before stretching of the conductive laminate is 2% or less.
[12] The difference (Hz ₁ -Hz ₀ ) between the haze (Hz ₁ ) after 100% stretching and the haze (Hz ₀ ) before stretching of the conductive laminate is 2% or less, [1] to [11] The conductive laminate according to any one of the above.
[13] The conductive laminate according to any one of [1] to [12], in which the wet heat surface resistance value change rate (Rt ₀ ) obtained by the following formula (2) is 150% or less.

Rt ₀ = (R ₂ / R ₀ ) × 100 (2)
(Wherein, Rt ₀ is wet heat surface resistance change ratio, _{R 0} is the same meaning as _{R 0} in the formula (1), _{R 2} represents a surface resistance after wet heat test described below.)
<Moist heat test>
The conductive laminate is exposed to an atmosphere of 85 ° C. and 85% RH for 400 hours before stretching.
[14] The conductive laminate according to any one of [1] to [13], in which the wet heat surface resistance value change rate (Rt ₁ ) obtained by the following formula (3) is 150% or less.

Rt ₁ = (R ₃ / R ₁ ) × 100 Formula (3)
(Wherein, Rt ₁ is wet heat surface resistance change ratio, _{R 1} is _{R 1} as defined, _{R 3} in the formula (1) represents a surface resistance after wet heat test described below.)
<Moist heat test>
The conductive laminate is exposed for 400 hours in an atmosphere of 85 ° C. and 85% RH after 100% stretching.
[15] A molded body using the conductive laminate according to any one of [1] to [14].
[16] A capacitive touch sensor using the conductive laminate according to any one of [1] to [14].
[17] A planar heating element using the conductive laminate according to any one of [1] to [14].
[18] A capacitive touch sensor using the molded article according to [15].
[19] A planar heating element using the molded article according to [15].
[20] A method for producing a molded body according to [15], wherein the molded body is molded by at least one selected from the group consisting of film insert molding, vacuum molding, three-dimensional laminate molding, and hot press molding. Method.

  ADVANTAGE OF THE INVENTION According to this invention, the change of the surface resistance value after shaping | molding and the raise of a haze are suppressed, Furthermore, the electrically conductive laminated body excellent in durability under high temperature high humidity can be provided. Here, being excellent in durability under high temperature and high humidity means that the rate of change in the surface resistance value when left for a long time under high temperature and high humidity is small. Details will be described later.

  By suppressing the change in the surface resistance value after molding, variation in the surface resistance value is reduced in a touch sensor including a curved surface (including a touch panel and a touch switch), and good operability can be obtained.

  If the variation of the surface resistance value in the touch sensor is large, it is difficult to recognize the accurate position information of the position touched by the touch sensor, but if the variation of the surface resistance value is small, the accurate position information of the position touched by the touch sensor is recognized. And can be used as a touch sensor with good operability.

  Moreover, the display quality of the touch sensor including a curved surface is not impaired by suppressing the increase in haze after molding. Furthermore, since the conductive laminate of the present invention is excellent in durability under high temperature and high humidity, it is suitable for a vehicle-mounted touch sensor or a planar heating element used in a severe environment.

FIG. 1 is a schematic cross-sectional view of an example of the conductive laminate of the present invention. FIG. 2 is a schematic cross-sectional view of an example of the conductive laminate of the present invention.

As shown in FIG. 1, the conductive laminate 10 of the present invention has a nanocarbon layer 12 and an overcoat layer 13 on at least one of base materials 11. The conductive laminate of the present invention has a surface resistance value change rate (R) after 100% stretching of 500% or less and a haze (Hz ₁ ) after 100% stretching of 3% or less. .

Here, the surface resistance value change rate (R) is calculated by the following equation (1) from the surface resistance value R ₀ of the conductive laminate before stretching and the surface resistance value R ₁ of the conductive laminate after 100% stretching. Value.

R = (R ₁ / R ₀ ) × 100 (1)

  Here, 100% stretching refers to stretching so that the size of the conductive laminate is doubled, and corresponds to a molding magnification of twice. The method for measuring the surface resistance value change rate (R) will be described in detail in the Examples section.

The conductive laminate of the present invention is _{one in which} the increase in surface resistance value (R) and haze (Hz ₁ ) after 100% stretching is suppressed, and such a conductive laminate is suitable for molding processing applications. is there. In particular, it is suitable for a touch sensor and a planar heating element.

  From the viewpoint of suppressing the change (increase) in the surface resistance value after molding, the conductive laminate of the present invention further has a surface resistance value change rate (R) after 100% stretching of preferably 450% or less, and 400%. The following is more preferable, and 300% or less is particularly preferable.

In addition, in the conductive laminate of the present invention, the haze (Hz ₁ ) after 100% stretching is preferably 2% or less, more preferably 1% or less, from the viewpoint of suppressing an increase in haze after molding. 8% or less is more preferable, and 0.5% or less is particularly preferable.

Since the surface resistance value change rate (R) and haze (Hz ₁ ) after 100% stretching of the conductive laminate are in the above ranges, the variation in conductivity is small and the display quality is good. It is suitably used for touch sensors such as touch switches.

The surface resistance value (R ₀ ) before stretching of the conductive laminate is appropriately set according to the applied device, but is preferably in the range of 10Ω / □ or more and 2,000Ω / □. For example, when applied to a touch sensor such as a touch switch or a touch panel, the surface resistance value (R ₀ ) of the conductive laminate before stretching may be designed to be in the range of 10 to 2,000Ω / □. preferable. More specifically, when applied to a touch switch, a range of 100 to 2,000 Ω / □ is preferable, a range of 100 to 1,000 Ω / □ is more preferable, and a range of 100 to 500 Ω / □ is particularly preferable. . Moreover, when applied to a touch panel, the range of 10 to 1,000Ω / □ is preferable, the range of 50 to 500Ω / □ is more preferable, and the range of 100 to 300Ω / □ is particularly preferable.

By designing the surface resistance value (R ₀ ) before stretching of the conductive laminate to be in the above range and setting the surface resistance value change rate (R) after stretching 100% to 500% or less, Design becomes easy and good operability of the touch sensor can be secured.

When the conductive laminate of the present invention is applied to a planar heating element, the surface resistance value (R ₀ ) before stretching is preferably 1000Ω / □ or less, more preferably 700Ω / □ or less, and particularly preferably 500Ω / □ or less. preferable. The lower limit is not particularly limited, but is about 10Ω / □. By designing the surface resistance value (R ₀ ) before stretching of the conductive laminate to be in the above range and setting the surface resistance value change rate (R) after 100% stretching to 500% or less, the heat generation efficiency is improved. A good planar heating element can be obtained.

The haze (Hz ₀ ) before stretching of the conductive laminate of the present invention is preferably 2% or less, more preferably 1% or less, further preferably 0.5% or less, and particularly preferably 0.4% or less.

Further, the difference (Hz ₁ -Hz ₀ ) between the haze after the 100% stretching of the conductive laminate (Hz ₁ ) and the haze before the stretching (Hz ₀ ) (Hz ₁ -Hz ₀ ) is preferably 2% or less, more preferably 1.5% or less. Preferably, it is further preferably 1% or less, particularly preferably 0.5% or less.

In one molded body, a portion with a large molding magnification and a small portion are often mixed, and by suppressing an increase in haze (Hz ₁ ) after 100% stretching, variation in haze in one molded body is reduced. can do.

  The conductive laminate of the present invention is excellent in durability under high temperature and high humidity even before stretching or after 100% stretching. Here, the durability under high temperature and high humidity is the change rate of the surface resistance value after the wet heat test (exposing the conductive laminate in an atmosphere of 85 ° C. and 85% RH for 400 hours) (hereinafter referred to as the change rate of the wet heat surface resistance value). It can be expressed as

The wet heat surface resistance value change rate (Rt ₀ ) of the conductive laminate before stretching is the surface resistance value (R ₂ ) after the wet heat test and the surface resistance value before the wet heat test (before stretching of the above-described formula (1)). From the surface resistance value (same as R ₀ ), it can be calculated by the following formula (2).

_{Rt 0 = (R 2 / R} 0) × 100 ··· formula (2).

Similarly, the wet heat surface resistance value change rate (Rt ₁ ) of the conductive laminate after 100% stretching is the surface resistance value after the wet heat test (R ₃ ) and the surface resistance value before the wet heat test (the above formula (1 ) And the surface resistance value after 100% stretching (same as R ₁ )), it can be calculated by the following formula (3).

Rt ₁ = (R ₃ / R ₁ ) × 100 Formula (3).

The conductive laminate of the present invention preferably has a wet heat surface resistance value change rate (Rt ₀ ) before stretching and a wet heat surface resistance value change rate (Rt ₁ ) after 100% stretch of 150% or less, It is more preferably 130% or less, further preferably 120% or less, and particularly preferably 115% or less.

  In the conductive laminate of the present invention, an undercoat layer can be provided between the substrate and the nanocarbon layer as necessary for improving interlayer adhesion and conductivity. Further, a functional layer such as a wiring or a resist can be provided on the overcoat layer.

[Base material]
The substrate used in the present invention can be appropriately selected depending on the application, molding method, and molding magnification, but a thermoplastic resin is preferable from the viewpoint of the productivity of the molded body. The base material in the conductive laminate of the present invention includes at least one resin selected from the group consisting of polycarbonate resin, acrylic resin, cyclic olefin resin, polyester resin, polyarylate resin, and acrylonitrile-butadiene-styrene copolymer synthetic resin. In particular, it is preferable that at least one resin selected from the group consisting of a polycarbonate resin, an acrylic resin, and a cyclic olefin resin is included. A plurality of base materials can be used in combination. For example, a composite substrate such as a substrate in which two or more kinds of resins are laminated may be used.

  What is necessary is just to select suitably about the kind and thickness of a base material with a use. For example, when using a decoration board etc. for the upper part of the electrically conductive laminated body of this invention, from viewpoints, such as cost, productivity, and handleability, the resin film whose thickness is 300 micrometers or less is preferable. Furthermore, the thickness of the resin film is preferably 200 μm or less, more preferably 150 μm or less, and particularly preferably 100 μm or less. The lower limit thickness is preferably 10 μm or more, more preferably 20 μm or more, and particularly preferably 30 μm or more. On the other hand, when using only the conductive laminate of the present invention, it is preferable to use a resin plate of 300 μm or more from the viewpoint of securing the strength of the conductive laminate.

  In order to facilitate the lamination of the nanocarbon layer or the undercoat layer described later on the substrate, the substrate surface is subjected to a surface treatment such as corona treatment, plasma treatment, primer treatment (eg, lamination of an easy-adhesion layer). Also good.

[Undercoat layer]
As shown in FIG. 2, the conductive laminate 10 of the present invention preferably has an undercoat layer 14 between the substrate 11 and the nanocarbon layer 12. Arrangement of the undercoat layer is preferable because the adhesion of the nanocarbon layer can be improved and the surface roughness of the conductive laminate can be adjusted.

  The undercoat layer preferably contains a resin. Such a resin is preferably a stretchable thermoplastic resin. Specifically, it is preferable to use at least one thermoplastic resin selected from the group consisting of urethane resin, carbonate resin, ester resin, ether resin, acrylic resin, vinyl resin and olefin resin. Among these thermoplastic resins, urethane resins are particularly preferable because of their high elongation and excellent water resistance and solvent resistance.

  Moreover, it is preferable that an undercoat layer contains particle | grains in order to improve the hydrophilic property of the undercoat layer surface. As such particles, inorganic particles are preferable, and silica particles are particularly preferable. Among the silica particles, colloidal silica is preferable, and water-dispersed colloidal silica is more preferable. Examples of the water-dispersed colloidal silica include “Snowtex” series manufactured by Nissan Chemical Industries, Ltd.

  The average particle size of the particles contained in the undercoat layer is preferably in the range of 5 nm to 500 nm, more preferably in the range of 10 nm to 200 nm, and particularly preferably in the range of 15 to 100 nm. The shape of the particles is not particularly limited, but is preferably spherical, flat or beaded.

  The mass ratio of the resin and particles in the undercoat layer is such that resin: particles = 80: 20 to 40 from the viewpoint of suppressing haze rise during stretching, improving the adhesion between the substrate and the conductive layer, and ensuring high conductivity. : 60 is preferable, and a range of 70:30 to 50:50 is particularly preferable.

  The thickness of the undercoat layer is preferably in the range of 50 to 1500 nm, more preferably in the range of 100 to 1000 nm, and particularly preferably in the range of 200 to 800 nm.

  The method for laminating the undercoat layer on the substrate is not particularly limited. Known wet coating methods can be used. Examples of such wet coating methods include spraying, dip coating, spin coating, knife coating, kiss coating, gravure coating, slot die coating, roll coating, bar coating, screen printing, inkjet printing, pad printing, and other types. Examples include printing methods. Further, a dry coating method may be used. As the dry coating method, physical vapor deposition such as sputtering or vapor deposition, chemical vapor deposition, or the like can be used. Moreover, application | coating may be performed in multiple times and it may combine two different types of application | coating methods. A preferred application method is wet coating, gravure coating, bar coating, or die coating.

  It is preferable to remove the solvent from the undercoat coating solution in the drying step after the coating step. Solvent removal methods include convection hot-air drying where hot air is applied to the substrate, radiant heat drying where the substrate absorbs infrared rays by radiation from an infrared drying device, and heats and heats to dry. It is possible to apply conductive heat drying that is heated and dried by heat conduction. Of these, convection hot air drying is preferred because of its high drying rate.

[Nanocarbon layer]
The nanocarbon layer in the present invention is a layer containing at least nanocarbon. Examples of nanocarbon include carbon nanotubes, graphene, fullerenes, strip-shaped graphene ribbons, peapods with fullerenes arranged inside carbon nanotubes, and conical nanohorns. The nanocarbon layer can be formed by laminating a coating liquid containing these nanocarbons on a substrate or an undercoat layer.

  As a material for the nanocarbon layer, carbon nanotubes are preferably used from the viewpoint of conductivity and productivity. Hereinafter, although the carbon nanotube will be described as a representative example of the nanocarbon contained in the nanocarbon layer, it is not limited to the carbon nanotube.

  The amount of lamination of the nanocarbon layer can be appropriately set according to the required resistance value and transmittance. From the viewpoint of conductivity and weather resistance, the thickness of the nanocarbon layer is preferably in the range of 1 nm to 100 nm, more preferably in the range of 1 nm to 50 nm, further preferably in the range of 1 nm to 20 nm, and in the range of 2 nm to 15 nm. Is particularly preferred.

The content of carbon nanotubes in the nano-carbon layer is preferably in the range of 1 to 30 mg / ^{m 2,} more preferably in the range of 2 to 20 mg / ^{m 2,} in particular in the range of 3~17mg / ^{m 2} is preferred. Also, the total solid content coating amount of the nano-carbon layer is suitably in the range of 2~90mg / ^{m 2,} preferably in the range of 3~60mg / ^{m 2,} the range of 4~50mg / ^{m 2} is preferred.

  The carbon nanotube is not particularly limited as long as it has a shape obtained by winding one surface of graphite into a cylindrical shape. Single-walled carbon nanotubes in which one surface of graphite is wound in one layer, wound in multiple layers. Any of the multi-walled carbon nanotubes can be applied, but in particular, carbon nanotubes in which 50 or more of the double-walled carbon nanotubes, in which one surface of graphite is wound in two layers, are contained in 100 are included for conductivity and coating. This is preferable because the dispersibility of the carbon nanotubes in the dispersion becomes extremely high. More preferably, 75 or more of 100 are double-walled carbon nanotubes, and most preferably 80 or more of 100 are double-walled carbon nanotubes. In addition, the fact that 50 of the double-walled carbon nanotubes are contained in 100 may be expressed as 50% of the double-walled carbon nanotubes. In addition, the double-walled carbon nanotube is preferable because the original function such as conductivity is not impaired even if the surface is functionalized by acid treatment or the like.

  For example, the carbon nanotube is manufactured as follows. A powdery catalyst in which iron is supported on magnesia is present in the entire horizontal cross-sectional direction of the reactor in a vertical reactor, and methane is supplied in the vertical direction into the reactor. The carbon nanotubes containing single- to five-layer carbon nanotubes can be obtained by contacting the carbon nanotubes at 200 ° C. to produce carbon nanotubes and then oxidizing the carbon nanotubes. Carbon nanotubes can be manufactured and then subjected to an oxidation treatment to increase the ratio of single-layer to five-layer, particularly the ratio of two- to five-layer. The oxidation treatment is performed, for example, by a nitric acid treatment method. Nitric acid is preferred because it acts as a dopant for the carbon nanotubes. A dopant is a substance that gives a surplus electron to a carbon nanotube or takes away an electron to form a hole, and improves the conductivity of the carbon nanotube by generating a carrier that can move freely. Is. The nitric acid treatment method is not particularly limited as long as carbon nanotubes can be obtained, but is usually performed in an oil bath at 140 ° C. The nitric acid treatment time is not particularly limited, but is preferably in the range of 5 to 50 hours.

[Dispersant]
As the carbon nanotube dispersant, a surfactant, various polymer materials (water-soluble polymer material, etc.) and the like can be used, and an ionic polymer material having high dispersibility is preferable. Examples of the ionic polymer material include an anionic polymer material, a cationic polymer material, and an amphoteric polymer material. Any type can be used as long as it has a high carbon nanotube dispersibility and can maintain dispersibility, but an anionic polymer material is preferred because of its excellent dispersibility and dispersion retainability. Of these, carboxymethylcellulose and its salts (sodium salt, ammonium salt, etc.) and polystyrenesulfonic acid salt are preferable because they can efficiently disperse carbon nanotubes in the carbon nanotube dispersion.

In the present invention, when a carboxymethyl cellulose salt or polystyrene sulfonate is used, as a cationic substance constituting the salt, for example,
Alkali metal cations such as lithium, sodium and potassium,
Alkaline earth metal cations such as calcium, magnesium, barium,
Ammonium ions or onium ions of organic amines such as monoethanolamine, diethanolamine, triethanolamine, morpholine, ethylamine, butylamine, coconut oil amine, beef tallow amine, ethylenediamine, hexamethylenediamine, diethylenetriamine, polyethyleneimine,
Alternatively, these polyethylene oxide adducts can be used, but are not limited thereto.

[solvent]
In the present invention, the solvent used in the carbon nanotube dispersion liquid is preferably water from the viewpoints that the dispersant can be easily dissolved or that the waste liquid can be easily treated.

[Carbon nanotube dispersion]
In the present invention, the method for preparing the carbon nanotube dispersion to be used is not particularly limited, and for example, it can be performed by the following procedure. Since the treatment time at the time of dispersion can be shortened, once a dispersion liquid containing carbon nanotubes in a concentration range of 0.003 to 0.15 mass% in the dispersion medium is prepared, dilution is performed to obtain a predetermined concentration. It is preferable to do. In the present invention, the mass ratio of the dispersant to the carbon nanotube (dispersant / carbon nanotube) is preferably 10 or less. Within such a preferable range, it is easy to uniformly disperse, but there is little influence of the decrease in conductivity. The mass ratio is more preferably from 0.5 to 9, further preferably from 1 to 6, and particularly preferably from 2 to 3, since high transparent conductivity can be obtained.

  As a dispersion means at the time of preparation, a carbon nanotube and a dispersing agent are mixed and dispersed in a dispersion medium, which is commonly used for coating liquid production (for example, a ball mill, a bead mill, a sand mill, a roll mill, a homogenizer, an ultrasonic homogenizer, a high-pressure homogenizer, an ultrasonic device. , An attritor, a resolver, a paint shaker, etc.). Moreover, you may disperse | distribute in steps, combining these some mixing dispersers. Among them, the method of preliminarily dispersing with a vibration ball mill and then dispersing using an ultrasonic device is preferable because the dispersibility of the carbon nanotubes in the obtained coating dispersion liquid is good.

[Overcoat layer]
The overcoat layer in the present invention has a function of protecting the nanocarbon layer. In other words, the overcoat layer has a function of suppressing the nanocarbon from breaking or dropping during molding (stretching) of the conductive laminate, and further improving the durability under high temperature and high humidity.

  From the above viewpoint, the overcoat layer preferably contains a resin having good adhesion to nanocarbon and high crosslink density. As such a resin, it is preferable to use at least one resin selected from the group consisting of urethane resin, carbonate resin, ester resin, ether resin, acrylic resin, vinyl resin and olefin resin.

  Among these resins, thermosetting resins or active energy ray curable resins are preferably used.

  The thermosetting resin is a resin that is polymerized or cross-linked by heat, and examples thereof include a urethane resin, a carbonate resin, an ester resin, an ether resin, an acrylic resin, a vinyl resin, and an olefin resin. Among these resins, urethane resins are preferably used because of their good moldability and durability.

  When using a thermosetting resin, it is preferable to use a crosslinking agent in combination. Examples of the crosslinking agent may include a melamine crosslinking agent, an oxazoline crosslinking agent, a carbodiimide crosslinking agent, an isocyanate crosslinking agent, an aziridine crosslinking agent, and an epoxy crosslinking agent.

  The active energy ray-curable resin is a resin that is polymerized and cured by active energy rays such as ultraviolet rays and electron beams. Examples of such resins include compounds (monomers and oligomers) having at least one ethylenically unsaturated group in the molecule. Here, examples of the ethylenically unsaturated group include acryloyl group, methacryloyl group, acryloyloxy group, methacryloyloxy group, allyl group, and vinyl group.

  The overcoat layer preferably contains at least an active energy ray curable resin, and among the active energy ray curable resins, an ultraviolet curable resin is preferable, and a urethane acrylate resin is particularly preferable. Here, the urethane acrylate resin includes a urethane methacrylate resin.

  Furthermore, among urethane acrylate resins, 1 to 5 functional (2 to 5 ethylenically unsaturated groups in one molecule) urethane acrylate resin is preferable, 2 to 4 functional urethane acrylate resin is more preferable, and 2 to 3 A functional urethane acrylate resin is particularly preferred.

  A commercially available urethane acrylate resin can be used. For example, AH series, AT series, UA series, UF series, UFA series manufactured by Kyoeisha Chemical Co., Ltd., UN-3320 series manufactured by Negami Kogyo Co., Ltd., UN-900 series, manufactured by Shin-Nakamura Chemical Co., Ltd. UA series, NK Oligo U series, Unidec series manufactured by DIC Corporation, and Ebecryl 1290 series manufactured by Daicel UCB.

  Moreover, the molecular weight of the urethane acrylate resin contained in the overcoat layer can be adjusted according to the molding magnification. For example, when the molding magnification is relatively large, it is preferable to use a urethane acrylate resin having a relatively large molecular weight. Also, two or more urethane acrylate resins having different functional groups and molecular weights can be used in combination. A urethane acrylate resin and a polyfunctional acrylic resin can be used in combination.

  By including the urethane acrylate resin in the overcoat layer, it is possible to suppress the tearing and cracking of nanocarbon during molding. As a result, the surface resistance value change and haze increase after molding are suppressed.

Whether or not the overcoat layer contains a urethane acrylate resin can be analyzed by the FT-IR-ATR method. As for the urethane skeleton, it peaks at urethane bonds 1,550-1,530 cm ⁻¹ , CO double bonds 1,770-1,750 cm ⁻¹ , 740-760 cm ⁻¹ , NH bonds 3,300-3,100 cm ⁻¹ . It is characterized by having a urethane acrylate of terminal vinyl groups double bonds ^{1,630 -1 cm -1, 610 -1 cm} -1, 1,408 -1 cm -1, the peak at 810 cm ^-1 Have. ^{That, 1,550~1,530cm -1, 1,770~1,750cm -1, 740~760cm} -1, 3,300~3,100cm -1, 1,630 -1 cm -1, 610 -1 ^{cm -1, 1,408 -1} cm ^-1, if 810 cm ^-1 peak to all is detected, it can be determined that includes a urethane acrylate resin.

  The overcoat layer is preferably used in combination with a urethane acrylate resin and a polyfunctional acrylic resin from the viewpoint of further improving the durability under high temperature and high humidity. Here, the polyfunctional acrylic resin includes a polyfunctional methacrylic resin. The mixing ratio of the urethane acrylate resin and the polyfunctional acrylic resin is preferably in the range of 1: 9 to 9: 1 by mass ratio, and more preferably in the range of 2: 8 to 8: 2.

  The polyfunctional acrylic resin is preferably an acrylic resin having 3 or more functional groups (the number of ethylenically unsaturated groups in one molecule is 3 or more), more preferably an acrylic resin having 4 or more functions, and particularly preferably an acrylic resin having 5 or more functions. . The upper limit of the number of functional groups of the polyfunctional acrylic resin is preferably 12 or less, more preferably 10 or less, and particularly preferably 9 or less.

  Examples of such polyfunctional acrylic resins include trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, glycerin propoxytri (meth) acrylate, pentaerythritol tri (meth) ) Acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol Examples include tetra (meth) acrylate and dipentaerythritol hexa (meth) acrylate. The expression “... (Meth) acrylate” includes two compounds of “... Acrylate” and “.

  When the overcoat layer contains an active energy ray-curable resin, it is preferable that a photopolymerization initiator is also included. Specific examples of such photopolymerization initiators include, for example, acetophenone, 2,2-diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone, benzophenone, 2-chlorobenzophenone, 4,4′-dichlorobenzophenone, 4,4′-bisdiethylaminobenzophenone, Michler's ketone, benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, methyl benzoylformate, p-isopropyl-α-hydroxyisobutylphenone, α-hydroxyisobutylphenone, 2, Carbonyl compounds such as 2-dimethoxy-2-phenylacetophenone and 1-hydroxycyclohexyl phenyl ketone, tetramethylthiuram monosulfide, teto Sulfur compounds such as lamethylthiuram disulfide, thioxanthone, 2-chlorothioxanthone, and 2-methylthioxanthone can be used. These photopolymerization initiators may be used alone or in combination of two or more.

  The thickness of the overcoat layer is preferably in the range of 15 to 250 nm, more preferably in the range of 45 to 200 nm, still more preferably in the range of 55 to 150 nm, and particularly preferably in the range of 65 to 120 nm. When the thickness of the overcoat layer is less than 15 nm, the durability under high temperature and high humidity may decrease, or the conductivity stabilizing effect at the time of bonding the adhesive layer may not be sufficiently exhibited. When the thickness of the overcoat layer is greater than 250 nm, the amount of carbon nanotubes present on the surface of the conductive layer decreases, and the contact resistance value may increase.

  Here, the thickness of the overcoat layer can be measured by observing the cross section with a transmission electron microscope (TEM). In this cross-sectional observation (cross-sectional photo observation), if the interface between the nanocarbon layer and the overcoat layer is clear, the thickness of the overcoat layer can be specified, but if the interface is not clear (the nanocarbon layer In the case where the resin of the overcoat layer permeates between the nanocarbons and the interface is unclear and the overcoat layer cannot be specified), the thickness of the overcoat layer is the thickness including the nanocarbon layer.

  The overcoat layer is formed by adjusting the solid content concentration so that the thickness after applying and drying a paint containing the resin as described above becomes a desired thickness, and the reverse coating method, gravure coating method, rod coating method. It is preferably applied by a wet coating method such as a bar coating method, a die coating method, a spray coating method, or a spin coating method.

  The coating material for the overcoat layer can be prepared by dissolving the resin as described above in a solvent or dispersing the resin in a dispersion medium.

  As a solvent or a dispersion medium used for the coating material of the overcoat layer, water, an organic solvent, or the like can be used. From the viewpoint of coating suitability, water, alcohol solvents such as isopropyl alcohol and ethanol, ester solvents such as ethyl acetate and butyl acetate, ketone solvents such as cyclohexanone and methyl ethyl ketone, and hydrocarbon solvents such as xylene and toluene are preferable. Used. These solvents may be used alone or in combination of two or more.

  Various additives can be blended in the overcoat layer coating material as required, as long as the effect of the overcoat layer is not impaired. For example, a catalyst, an antioxidant, a light stabilizer, a stabilizer such as an ultraviolet absorber, a surfactant, a leveling agent, an antistatic agent, or the like can be used.

  Next, it is preferable to dry the coated film after application to remove the solvent and the dispersion medium. Here, there is no restriction | limiting in particular as a heat source used for drying, Arbitrary heat sources, such as a steam heater, an electric heater, and an infrared heater, can be used. The heating temperature is preferably 50 to 150 ° C. The heat treatment time is preferably several seconds to 1 hour. Furthermore, the temperature may be constant during the heat treatment, or the temperature may be gradually changed. Moreover, you may heat-process, adjusting humidity in the range of 20 to 90% RH by relative humidity during a drying process. You may perform the said heat processing in the state enclosed with air | atmosphere or inert gas.

  Next, the composition of the coating film can be modified by applying an active energy ray irradiation treatment such as ultraviolet irradiation to the coating film containing the resin after drying as necessary, and the overcoat layer in the present invention can be obtained. The ultraviolet treatment may be performed only once or repeated twice or more. The oxygen concentration during the ultraviolet treatment is preferably 1.0% by volume or less when the total amount of gas in the system during the overcoat treatment is 100% by volume from the viewpoint of composition control of the overcoat layer. More preferable is 5% by volume or less. The relative humidity may be arbitrary. In the ultraviolet treatment, it is more preferable to reduce the oxygen concentration using nitrogen gas.

  As the ultraviolet ray generation source, a known source such as a high pressure mercury lamp metal halide lamp, a microwave type electrodeless lamp, a low pressure mercury lamp, a xenon lamp or the like can be used.

Integrated light quantity of ultraviolet irradiation is preferably from ^{50~3,000mJ / cm 2, 100~1,000mJ / cm} 2 is more preferable. If the integrated light quantity is 50 mJ / cm ² or more, a desired overcoat layer can be obtained, which is preferable. Further, it is preferable that the integrated light quantity is 3,000 mJ / cm ² or less because damage to the substrate can be reduced.

[Molding and molding]
The conductive laminate of the present invention can be molded using various molding methods. Examples of the molding method include vacuum molding, pressure molding, pressure vacuum molding combining vacuum molding and pressure molding, press molding, plug molding, laminate molding, in-mold molding, insert molding, and the like. The conductive laminate of the present invention can be processed into various molded bodies (for example, touch sensors, planar heating elements, electromagnetic wave shielding materials, antenna members, etc.) using these molding methods.

  That is, the molded body using the conductive laminate of the present invention refers to a molded body using the above-described molding method.

  Furthermore, during the molding process, the type and properties of the base material of the conductive laminate, the type and properties of the resin contained in the layer to be laminated (such as the nanocarbon layer and the overcoat layer), the thickness of the base material and layer, It is preferable to select a molding method as appropriate in accordance with the shape of the molded body. From the above viewpoint, film insert molding, vacuum molding, three-dimensional laminate molding, and hot press molding are preferably used as a molding method for processing the conductive laminate of the present invention into a molded body in consideration of productivity.

Further, a molded body obtained by molding the conductive laminate of the present invention is a decorative film or other resin material,
For example, it can be used by being bonded to a resin sheet for surface protection or designability.

[Usage]
The conductive laminate of the present invention and the molded body thereof can be applied to touch sensors such as touch switches and touch panels, planar heating elements, electromagnetic wave shielding materials, antenna members, and the like. In particular, the conductive laminate and the molded body of the present invention are suitable for touch sensors and planar heating elements.

  The touch sensor system is roughly classified into a resistive touch sensor and a capacitive touch sensor, but a capacitive touch sensor is suitable for molding applications. That is, the conductive laminate and the molded body of the present invention are suitable for a capacitive touch sensor.

  Capacitive touch sensors (capacitive touch panel and capacitive touch switch) using the conductive laminate or molded body of the present invention are used for home appliances (lighting touch switches) and in-vehicle applications (heater control panels). And a touch switch around the instrument panel).

  When the conductive laminate or molded body of the present invention is applied to the above-described electrostatic capacitance type touch sensor for home appliances or in-vehicle use, the conductive laminate of the present invention can be molded into various shapes, thereby improving the design. Moreover, since the molded body of the conductive laminate of the present invention has a low haze, there is an advantage that display quality is hardly impaired.

  The conductive laminate and the molded body of the present invention are suitable for a planar heating element. The planar heating element is used as a heater for snow melting, defrosting and anti-fogging (anti-fogging) for a light emitter, mirror, mirror, surveillance camera, etc., and the conductive laminate of the present invention is used as these planar heating elements. Is preferred.

  A luminous body, for example, a traffic light, a vehicle headlight, a display device, a streetlight, etc., is usually composed of a light source and a transparent front cover. In cold districts, ice, snow, frost, etc. may adhere to the outer surface of the front cover of the light emitter, which may reduce the visibility. However, the above problem is posed by arranging a planar heating element inside the front cover. Can be eliminated.

  The mirror, the mirror, and the light receiving unit of the surveillance camera have the same problem as described above, and can be solved by arranging the planar heating element.

  Since the front cover of the light emitter, the mirror, the mirror, and the light receiving portion of the surveillance camera are required to have high transparency (having a small haze), the conductive laminate and the molded body of the present invention are suitable.

  In addition, the front cover of the light emitter, the mirror, and the light receiving portion of the surveillance camera are often curved, and the planar heating element also needs to be molded into a curved shape. The conductive laminate of the present invention is suitable because it has high moldability. In addition, the conductive laminate of the present invention and its molded body exhibit a high rate of heat generation and maintain high transparency because the rate of change (increase rate) in surface resistance after molding and the increase in haze are relatively small. can do.

  Hereinafter, the present invention will be specifically described based on examples. However, the present invention is not limited to the following examples.

[Evaluation method]
(1) Measurement of surface resistance value (R ₀ ) before stretching The four-probe probe is brought into close contact with the nanocarbon layer side of the conductive laminate, and the conductive laminate is made at room temperature (23 ° C., 50% RH) by the four-terminal method. The surface resistance value (R ₀ ) on the body surface was measured.
The apparatus used for the measurement is a resistivity meter MCP-T360 manufactured by Dia Instruments, and the probe used is a 4-probe probe MCP-TFP manufactured by Dia Instruments.
If the sample width is small and measurement by the 4-terminal method is difficult, apply silver paste (ECM-100, manufactured by Taiyo Ink Co., Ltd.) to both ends of the sample to a width of 5 mm, dry at 90 ° C. for 30 minutes, and use a tester The resistance value is measured and the surface resistance value is calculated.

(2) Production of 100% stretched sample A test sample was produced by cutting the conductive laminate into a length of 150 mm and a width of 20 mm. The temperature in the tank of a tensile tester (“Tensilon” manufactured by Yamato Kagaku Co., Ltd.) was adjusted at 160 ° C., and the test sample was placed so as to have a test length of 30 mm and heated for 1 minute. Thereafter, while maintaining the inside temperature of the tank, the film was stretched 30 mm at a pulling speed of 50 mm / min (100% stretching; equivalent to a molding magnification of 2) and fixed as it was for 10 seconds, and then a test sample was taken out. The sample obtained under the above conditions is hereinafter referred to as “stretched sample”.

(3) Measurement of surface resistance value change rate (R) after 100% stretching [Measurement of surface resistance value (R ₁ ) of stretched sample]
The surface resistance value (R ₁ ) of the stretched sample obtained above was measured by the same method as in “(1) Measurement of surface resistance value (R ₀ ) before stretching”.
[Calculation of surface resistance value change rate (R) after 100% stretching]
Surface resistance before stretching of the conductive laminate and (R _0), was calculated surface resistance change ratio (R) at the surface resistance of the stretched sample (R ₁₎ from the following equation (1).
_{R = R 1 / R 0 ×} 100 ··· formula (1).

(4) Haze Based on JIS-K7361 (1997), using a turbidimeter NDH4000 (manufactured by Nippon Denshoku Industries Co., Ltd.), haze (Hz0) of the conductive laminate before stretching and stretching after 100% stretching About the haze (Hz1) of the sample, it measured so that it might each inject from a nanocarbon layer side surface.

(5) Thickness of overcoat layer The thickness of the overcoat layer of the conductive laminate was measured by TEM observation of the cross section. The cross section of the conductive laminate to be measured was thinned with a focused ion beam device (FIB, Focused Ion Beam) (“FB2000A” manufactured by Hitachi High-Technology Co., Ltd.), and a transmission electron microscope (TEM) (Transmission Electron Microscope) (Hitachi High Co., Ltd.). Technology “H7100FA”) was used. The interface was judged from the contrast difference of the obtained image and measured. The observation was performed in the range of 20,000 times to 100,000 times, and the magnification was selected and measured so that the thickness of the overcoat layer was 50% or more in the vertical direction within one field of view. When the nanocarbon layer and the overcoat layer were mixed and the interface was unknown, the thickness of the overcoat layer was determined to include the nanocarbon layer.

(6) Durability (wet heat surface resistance change ratio (Rt ₀₎₎ for conductive laminate before evaluation stretching, wet heat surface resistance change ratio (Rt ₀₎ was evaluated by the following method.
[Measurement of surface resistance value (R ₂ ) after wet heat test]
The conductive laminate was cut to 100 mm × 50 mm to prepare a test sample. The test sample was placed in a thermo-hygrostat set to 85 ° C. and 85% RH (“SH-221” manufactured by Espec Co., Ltd.) for 400 hours with the nanocarbon layer face up, and then at room temperature (23 ° C. , 50% RH) for 24 hours, and the surface resistance value (R ₂ ) was measured by the same method as the above “(1) Measurement of surface resistance value (R ₀ ) before stretching”.
[Calculation of wet heat surface resistance value change rate (Rt ₀ )]
From the surface resistance value (R ₀ ) before the wet heat test and the surface resistance value R ₂ after the wet heat test, the rate of change of wet heat surface resistance value (Rt ₀ ) was calculated by the following formula (2). Here, as the surface resistance value (R ₀ ) before the wet heat test, the value obtained in “(1) Measurement of surface resistance value (R ₀ ) before stretching” was used.
_{Rt 0 = (R 2 / R} 0) × 100 ··· formula (2).

(7) Evaluation of (wet heat surface resistance value change rate (Rt ₁ )) of stretched sample About the stretched sample obtained in the above “(2) Production of 100% stretched sample”, the above “(6) Durability (wet heat surface The surface resistance value (R ₃ ) after the wet heat test was measured in the same manner as in “Evaluation of resistance value change rate (Rt ₀ )”. Next, the wet heat surface resistance value change rate (Rt ₁ ) was calculated by the following formula (3). Here, as the surface resistance value (R ₁ ) of the stretched sample before the wet heat test, the value obtained in the above “measurement of the surface resistance value (R ₁ ) of stretched sample in (3)” was used.
Rt ₁ = (R ₃ / R ₁ ) × 100 Formula (3).

[Example of catalyst preparation: catalyst metal salt supported on magnesia]
Ammonium iron citrate (manufactured by Wako Pure Chemical Industries, Ltd.) is dissolved in methanol (manufactured by Kanto Chemical Co., Ltd.), magnesium oxide (MJ-30, manufactured by Iwatani Chemical Industry Co., Ltd.) is added, and the mixture is stirred with a stirrer. The suspension was concentrated to dryness at 40 ° C. under reduced pressure. The obtained powder was heated and dried at 120 ° C. to remove methanol, and a catalyst body in which a metal salt was supported on magnesium oxide powder was obtained. The obtained solid content was collected on a sieve and the particle size in the range of 20 to 32 mesh (0.5 to 0.85 mm) was collected while being finely divided in a mortar. The above operation was repeated and subjected to the following experiment.

[Example of carbon nanotube aggregate production: synthesis of carbon nanotube aggregate]
The reactor is a cylindrical quartz tube having an inner diameter of 75 mm and a length of 1,100 mm, a quartz sintered plate is provided at the center, and a mixed gas serving as an inert gas and source gas supply line at the lower part of the quartz tube. The introduction pipe is equipped with a waste gas pipe at the top. Further, three electric furnaces are provided as heaters surrounding the circumference of the reactor so that the reactor can be maintained at an arbitrary temperature. A thermocouple is provided to detect the temperature in the reaction tube.

  The catalyst layer was formed by introducing the solid catalyst body prepared in the catalyst preparation example onto the quartz sintered plate at the center of the reactor installed in the vertical direction. While heating the catalyst layer until the temperature in the reaction tube reaches about 860 ° C., nitrogen gas is supplied at 16.5 L / min from the bottom of the reactor toward the top of the reactor using a mass flow controller. Circulated to pass through. Thereafter, while supplying nitrogen gas, methane gas was further introduced at 0.78 L / min for 60 minutes using a mass flow controller, and the gas was passed through the catalyst body layer for reaction. The contact time (W / F) obtained by dividing the mass of the solid catalyst body by the flow rate of methane at this time was 169 minutes · g / L, and the linear velocity of the gas containing methane was 6.55 cm / second. The quartz reaction tube was cooled to room temperature while the introduction of methane gas was stopped and nitrogen gas was passed through at 16.5 L / min. The heating was stopped and the mixture was allowed to stand at room temperature. After the temperature reached room temperature, the carbon nanotube-containing composition containing the catalyst body and the carbon nanotubes was taken out from the reactor.

[Purification and oxidation treatment of carbon nanotube aggregates]
Using the catalyst body obtained in the carbon nanotube aggregate production example and the carbon nanotube-containing composition containing carbon nanotubes, the catalyst metal, iron, and its support were stirred for 1 hour in 2000 mL of a 4.8N hydrochloric acid aqueous solution. Some MgO was dissolved. The resulting black suspension was filtered, and the filtered product was again put into 400 mL of a 4.8N hydrochloric acid aqueous solution, treated with MgO, and collected by filtration. This operation was repeated 3 times (de-MgO treatment). Thereafter, the carbon nanotube-containing composition was stored in a wet state containing water after washing with ion-exchanged water until the suspension of the filtered material became neutral.

  About 300 times as much concentrated nitric acid (manufactured by Wako Pure Chemical Industries, Ltd., first grade, Assay 60-61 mass%) was added to the dry mass of the obtained carbon nanotube-containing composition in the wet state. Thereafter, the mixture was heated to reflux with stirring in an oil bath at about 140 ° C. for 25 hours. After heating to reflux, a nitric acid solution containing the carbon nanotube-containing composition was diluted with ion-exchanged water three times and suction filtered. After washing with ion-exchanged water until the suspension of the filtered material became neutral, a wet carbon nanotube aggregate containing water was obtained.

[Preparation of carbon nanotube dispersion]
[Carbon nanotube dispersion (1)]
The obtained carbon nanotube aggregate in a wet state, 6 mass% sodium carboxymethylcellulose (Daiichi Kogyo Seiyaku Co., Ltd., Cellogen 5A (mass average molecular weight: 80,000)) aqueous solution, ion-exchanged water, zirconia beads (Toray Industries, Inc.) ), “Traceram” (registered trademark), bead size: 0.8 mm) was added to the container, and the pH was adjusted to 10 using a 28 mass% aqueous ammonia solution (manufactured by Kishida Chemical Co., Ltd.). (Dispersant / carbon nanotube mass ratio = 2.5) This container was shaken for 2 hours using a vibration ball mill (manufactured by Irie Trading Co., Ltd., VS-1, frequency: 1,800 cpm (60 Hz)), and carbon A nanotube paste was prepared.

  Next, this carbon nanotube paste was diluted with ion-exchanged water so that the concentration of carbon nanotubes was 0.15% by mass, and adjusted to pH 10 with 28% by mass ammonia aqueous solution again with respect to 10 g of the diluted solution. The aqueous solution was subjected to dispersion treatment under ice-cooling for 1.5 minutes (0.6 kW · min / g) with an output of an ultrasonic homogenizer (manufactured by Ieda Trading Co., Ltd., VCX-130) at 20 W. At that time, the liquid temperature during dispersion was set to 10 ° C. or lower. The obtained liquid was centrifuged at 10,000 G for 15 minutes with a high-speed centrifuge (Tomy Seiko Co., Ltd., MX-300) to obtain a carbon nanotube dispersion. Thereafter, water was added to prepare a carbon nanotube dispersion liquid (1) by adjusting the final concentration of the carbon nanotube aggregate to 0.06% by mass.

[Overcoat coating solution 1]
Bifunctional urethane acrylate (“UF-8001G” manufactured by Kyoeisha Chemical Co., Ltd.) is diluted with a solvent in which isopropyl alcohol and ethyl acetate are mixed at a mass ratio of 7: 3 to a solid content concentration of 2.0% by mass, and photopolymerization is performed. An overcoat coating solution 1 was prepared by adding 5% by mass of an initiator (“IRGACURE184” manufactured by BASF) to the resin solid content.

[Overcoat coating solution 2]
Difunctional urethane acrylate (“UA-122P” manufactured by Shin-Nakamura Chemical Co., Ltd.) is diluted with a solvent in which isopropyl alcohol and ethyl acetate are mixed at a mass ratio of 7: 3, and the solid content concentration is set to 2.0 mass%. A polymerization initiator (“IRGACURE184” manufactured by BASF) was added in an amount of 5% by mass with respect to the resin solid content to obtain an overcoat coating solution 2.

[Overcoat coating solution 3]
A trifunctional urethane acrylate (“Unidec” manufactured by DIC Corporation) was diluted with a solvent in which isopropyl alcohol and ethyl acetate were mixed at a mass ratio of 7: 3 to a solid content concentration of 2.0% by mass, and a photopolymerization initiator ( 5% by mass of “IRGACURE184” manufactured by BASF) was added to the resin solid content to obtain an overcoat coating solution 3.

[Overcoat coating solution 4]
Bifunctional urethane acrylate (“Kyoeisha Chemical Co., Ltd.“ UFA-01P ”) and hexafunctional acrylic resin (dipentaerythritol hexaacrylate; Kyoeisha Chemical Co., Ltd.“ DPE-6A ”) were used at a mass ratio of 5: 5. It is diluted with a solvent in which propyl alcohol and ethyl acetate are mixed at a mass ratio of 9: 1, the solid content concentration is 2.0 mass%, and the photopolymerization initiator (“IRGACURE184” manufactured by BASF) is added to the resin solid content. An overcoat coating solution 4 was prepared by adding 5% by mass.

[Overcoat coating solution 5]
Bifunctional urethane acrylate (“Kyoeisha Chemical Co., Ltd.“ UFA-01P ”) and hexafunctional acrylic resin (dipentaerythritol hexaacrylate; Kyoeisha Chemical Co., Ltd.“ DPE-6A ”) were used at a mass ratio of 2: 8. It is diluted with a solvent in which propyl alcohol and ethyl acetate are mixed at a mass ratio of 9: 1, the solid content concentration is 2.0 mass%, and the photopolymerization initiator (“IRGACURE184” manufactured by BASF) is added to the resin solid content. An overcoat coating solution 5 was prepared by adding 5% by mass.

[Overcoat coating solution 6]
A hexafunctional acrylic resin (dipentaerythritol hexaacrylate; “DPE-6A” manufactured by Kyoeisha Chemical Co., Ltd.) is diluted with a solvent in which isopropyl alcohol and ethyl acetate are mixed at a mass ratio of 7: 3, and the solid content concentration is 2. The overcoat coating liquid 6 was prepared by adding 5% by mass of a photopolymerization initiator (“IRGACURE184” manufactured by BASF) to the resin solid content.

[Overcoat coating solution 7]
An aqueous dispersion of thermoplastic polyurethane resin ("Superflex 150" solid content concentration: 30% by mass, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) is diluted with water to a solid content concentration of 2.0% by mass, and an overcoat coating solution It was set to 7.

[Undercoat coating solution 1]
An aqueous dispersion of thermoplastic polyurethane resin (“Superflex 150” solid content concentration: 30% by mass manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) is used as the resin for the undercoat layer, and an aqueous dispersion of silica particles (Nissan Chemical Co., Ltd.) “Snowtex OUP” (solid content concentration: 15% by mass) manufactured by the company was used as the silica particles contained in the undercoat layer. Superflex 150, Snowtex OUP, and pure water were mixed at a mass ratio of 5.25: 4.5: 5.25 to obtain an undercoat coating solution 1 having a solid content of 15% by mass.

[Undercoat coating solution 2]
An aqueous dispersion of thermoplastic polyurethane resin (“Superflex 150” solid content concentration: 30% by mass manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) is used as the resin for the undercoat layer, and an aqueous dispersion of silica particles (Nissan Chemical Co., Ltd.) “Snowtex O” (solid content concentration: 20% by mass) manufactured by the company was used as the silica particles contained in the undercoat layer. Superflex 150, Snowtex O, pure water, and normal propyl alcohol were mixed at a mass ratio of 1: 1.5: 0.9: 0.7 to obtain an undercoat coating solution 2 having a solid content of 15% by mass.

Example 1
Using a polycarbonate resin film (“Carbo Glass” manufactured by Asahi Glass Co., Ltd.) having a thickness of 200 μm as a base material, a carbon nanotube dispersion liquid (1) was applied to the surface of the base material as a nanocarbon layer using a wire bar at 100 ° C. Dried for 1 minute. Thereafter, as the overcoat layer, the overcoat coating solution 1 was applied onto the nanocarbon layer using a wire bar and dried at 80 ° C. for 1 minute. Furthermore, UV irradiation was performed using a UV irradiation apparatus (“ECS-301” manufactured by Eye Graphics Co., Ltd.) under a nitrogen atmosphere at an irradiation amount of an integrated light amount of 400 mJ / cm ² to obtain a conductive laminate 1. Table 1 shows the measurement results of the overcoat layer thickness, surface resistance value, and haze of the obtained conductive laminate 1.
Next, the obtained conductive laminate 1 was stretched 100% to obtain a stretched sample 1.

(Example 2)
A polycarbonate resin film having a thickness of 200 μm (“Carbo Glass” manufactured by Asahi Glass Co., Ltd.) is used as a base material. Undercoat layer 1 is applied to the surface of the base material as an undercoat layer using a wire bar at 125 ° C. for 1 minute. Dried. The thickness of the undercoat layer 1 was 500 nm. Thereafter, a carbon nanotube dispersion (1) was applied as a nanocarbon layer on the undercoat layer using a wire bar, and dried at 100 ° C. for 1 minute. Thereafter, as the overcoat layer, the overcoat coating solution 1 was applied onto the nanocarbon layer using a wire bar and dried at 80 ° C. for 1 minute. Further, using a UV irradiation device (“ECS-301” manufactured by Eye Graphics Co., Ltd.), UV irradiation was performed at an irradiation amount of an integrated light amount of 400 mJ / cm ² under a nitrogen atmosphere to obtain a conductive laminate 2.
Next, the obtained conductive laminate 2 was stretched 100% to obtain a stretched sample 2.

(Example 3)
A conductive laminate 3 and a stretched sample 3 were obtained in the same manner as in Example 2 except that the overcoat coating solution 2 was used for the overcoat layer.

Example 4
A conductive laminate 4 and a stretched sample 4 were obtained in the same manner as in Example 2 except that the overcoat coating solution 3 was used for the overcoat layer.

(Example 5)
A conductive laminate 5 and a stretched sample 5 were obtained in the same manner as in Example 2 except that the thickness of the overcoat layer was changed.

(Example 6)
A conductive laminate 6 and a stretched sample 6 were obtained in the same manner as in Example 2 except that the thickness of the overcoat layer was changed.

(Example 7)
A conductive laminate 7 and a stretched sample 7 were obtained in the same manner as in Example 2, except that a cyclic olefin resin film (“ZEONOR” manufactured by Nippon Zeon Co., Ltd.) having a thickness of 188 μm was used as the substrate.

(Example 8)
A conductive laminate 8 and a stretched sample 8 were obtained in the same manner as in Example 2 except that an acrylic resin film having a thickness of 125 μm (“Acryprene” manufactured by Mitsubishi Rayon Co., Ltd.) was used as the substrate.

Example 9
A conductive laminate 9 and a stretched sample 9 were obtained in the same manner as in Example 2 except that the undercoat coating solution 2 was used for the undercoat layer and the overcoat coating solution 4 was used for the overcoat layer.

(Example 10)
A conductive laminate 10 and a stretched sample 10 were obtained in the same manner as in Example 2 except that the undercoat coating solution 2 was used for the undercoat layer and the overcoat coating solution 5 was used for the overcoat layer.

(Comparative Example 1)
Using a polycarbonate resin film (“Carbo Glass” manufactured by Asahi Glass Co., Ltd.) having a thickness of 200 μm as a base material, a carbon nanotube dispersion liquid (1) was applied to the surface of the base material as a nanocarbon layer using a wire bar at 100 ° C. The conductive laminate 101 was obtained by drying for 1 minute.

  Next, the obtained conductive laminate 101 was stretched 100% to obtain a stretched sample 101.

(Comparative Example 2)
A conductive laminate 102 and a stretched sample 102 were obtained in the same manner as in Example 2 except that the overcoat coating solution 6 was used for the overcoat layer.

(Comparative Example 3)
A conductive laminate 103 and a stretched sample 103 were obtained in the same manner as in Example 2 except that the overcoat coating solution 7 was used for the overcoat layer.

[Evaluation]
Tables 1 and 2 show the results of evaluating the conductive laminates and stretched samples obtained in the above Examples and Comparative Examples.

10: Conductive laminate 11: Base material 12: Nanocarbon layer 13: Overcoat layer 14: Undercoat layer

Hereinafter, the present invention will be specifically described based on examples. However, the present invention is not limited to the following examples. Examples 1 to 8 are referred to as Reference Examples 1 to 8, and Examples 9 and 10 are referred to as Examples 1 and 2.

Claims (20)

A conductive laminate having a nanocarbon layer and an overcoat layer in this order on at least one of the substrates, and the surface resistance value change rate (R) after 100% stretching of the conductive laminate obtained by the following formula (1) Is 500% or less, and the haze (Hz ₁ ) after 100% stretching of the conductive laminate is 3% or less.
R = (R ₁ / R ₀ ) × 100 (1)
(In the formula, R represents the rate of change in surface resistance after 100% stretching, R ₀ represents the surface resistance value before stretching, and R ₁ represents the surface resistance value after 100% stretching.)   The conductive laminate according to claim 1, wherein the overcoat layer contains a thermosetting resin or an active energy ray curable resin.   The conductive laminate according to claim 2, wherein the active energy ray curable resin is an ultraviolet curable resin.   The electrically conductive laminated body in any one of Claims 1-3 in which the said overcoat layer contains urethane acrylate resin.   The conductive laminate according to claim 1, wherein the overcoat layer includes a urethane acrylate resin and a polyfunctional acrylic resin.   The electrically conductive laminated body in any one of Claims 1-5 in which the said base material contains at least 1 resin chosen from the group which consists of polycarbonate resin, an acrylic resin, and cyclic olefin resin.   The conductive laminate according to claim 1, further comprising an undercoat layer between the base material and the nanocarbon layer, wherein the undercoat layer contains a thermoplastic resin.   The conductive laminate according to claim 7, wherein the undercoat layer further contains particles.   The conductive laminate according to claim 7 or 8, wherein the thermoplastic resin is a urethane resin.   The conductive laminate according to claim 8 or 9, wherein the particles are silica particles. The conductive laminate according to any one of claims 1 to 10, wherein a haze (Hz ₀ ) before stretching of the conductive laminate is 2% or less. The difference in haze after 100% stretch conductor laminate a (Hz ₁₎ and before stretching haze _{(Hz 0) (Hz 1 -Hz} 0) is 2% or less, according to any one of claims 1 to 11 Conductive laminate. The conductive laminate according to any one of claims 1 to 12, wherein the wet laminate surface resistance value change rate (Rt ₀ ) obtained by the following formula (2) of the conductive laminate is 150% or less.
Rt ₀ = (R ₂ / R ₀ ) × 100 (2)
(Wherein, Rt ₀ is wet heat surface resistance change ratio, _{R 0} is the same meaning as _{R 0} in the formula (1), _{R 2} represents a surface resistance after wet heat test described below.)
<Moist heat test>
The conductive laminate is exposed to an atmosphere of 85 ° C. and 85% RH for 400 hours before stretching. The conductive laminate according to any one of claims 1 to 13, wherein the rate of change in wet heat surface resistance (Rt ₁ ) obtained by the following formula (3) of the conductive laminate is 150% or less.
Rt ₁ = (R ₃ / R ₁ ) × 100 Formula (3)
(Wherein, Rt ₁ is wet heat surface resistance change ratio, _{R 1} is _{R 1} as defined, _{R 3} in the formula (1) represents a surface resistance after wet heat test described below.)
<Moist heat test>
The conductive laminate is exposed for 400 hours in an atmosphere of 85 ° C. and 85% RH after 100% stretching.   The molded object using the electrically conductive laminated body in any one of Claims 1-14.   A capacitive touch sensor using the conductive laminate according to claim 1.   A planar heating element using the conductive laminate according to claim 1.   A capacitive touch sensor using the molded body according to claim 15.   A planar heating element using the molded body according to claim 15.   The method for producing a molded body according to claim 15, wherein the molded body is molded by at least one selected from the group consisting of film insert molding, vacuum molding, three-dimensional laminate molding, and hot press molding.

Images