JP3959342B2 - Sheet resin laminate for touch panel and touch panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet-like resin laminate for a touch panel and a touch panel .
[0002]
[Prior art]
Touch panels are used for computers, various terminal devices, vending machines, ATMs (cash dispensers), and the like.
As shown in FIG. 4, the touch panel 100 generally has a glass substrate 300 side surface above a glass substrate 300 having a conductive layer 200 made of ITO (indium tin oxide), which is a transparent conductive material, on the surface. When the resin film 400 provided with the same conductive layer 200 is disposed at a predetermined interval via the spacer 500 and the resin film 400 is pressed from above with the touch pen 600 or the like as shown in FIG. The bent portion is bent toward the glass substrate 300 side, and the conductive layer 200 of the resin film 400 and the conductive layer 200 on the glass substrate 300 side come into contact with each other to be in an energized state (Patent Document 1).
[0003]
However, since ITO is a hard material, it has the property of being easily peeled off or cut even by some deflection, and the resistance value of the conductive layer 200 on the resin film 400 side gradually changes with use. There is a risk that it cannot be displayed.
[0004]
On the other hand, a conductive resin composition is also proposed in which conductivity is imparted by mixing and dispersing metal particles such as silver powder having conductivity in a binder resin (Patent Document 2).
However, in the case of the conductive resin composition as described above, since it lacks transparency, there is a problem that it cannot be used for applications such as a touch panel that requires transparency, and lacks flexibility.
[0005]
[Patent Document 1]
JP-A-6-309101 [Patent Document 2]
JP-A-2002-324428 [0006]
[Problems to be solved by the invention]
In view of the circumstances as described above, an object of the present invention is to provide a sheet-like resin laminate for a touch panel and a touch panel which are rich in transparency, conductivity and flexibility.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a sheet-like resin laminate for a touch panel according to the present invention comprises a base material layer made of a transparent resin and a conductive layer laminated on the base material layer, and the conductive layer is a substrate-side conductive layer. a touch panel sheet-like resin laminate comprising a conductive state in contact with a pair facing arranged in the substrate side conductive layer, a resin in which carbon nano striatum wherein the conductive layer on the transparent matrix resin is dispersed It is characterized by comprising a composition.
[0008]
In the touch panel of the present invention, a sheet-like resin laminate for a touch panel including a base material layer made of a transparent resin and a conductive layer laminated on the base material layer is in a state where the conductive layer faces the substrate-side conductive layer. It is a touch panel disposed at a predetermined interval on the upper side of the substrate via a spacer,
The conductive layer of the sheet-like resin laminate for touch panel is made of a resin composition in which carbon nanowires are dispersed in a transparent matrix resin .
[0009]
In the present invention, the carbon nano striatum, means: a carbon nano striatal 300nm in diameter, but are not limited especially, single-walled carbon nanotubes (e.g., Hyperion Corporation SWCNT), multi-walled carbon nanotubes (e.g. MWCNT manufactured by Hyperion Co., Ltd.), vapor grown carbon nanofibers (for example, VGCF manufactured by Showa Denko KK), and the like, and multi-walled carbon nanotubes and vapor grown carbon nanofibers are preferably used.
Moreover, you may make it mix and use a carbon nanowire and a carbon nanoparticle.
[0010]
Although it does not specifically limit as resin and matrix resin which comprise the base material layer used for this invention, For example, a polycarbonate, polyamide, a polyethylene terephthalate, an acrylic resin etc. are mentioned.
Although it does not specifically limit as a shape of a laminated body, A film form and a sheet form are mentioned.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
FIG. 1 shows one embodiment of a laminate according to the present invention.
[0012]
As shown in FIG. 1, the laminate 7 is in a sheet shape, and a conductive layer 72 is laminated on one surface of a base material layer 71.
The base material layer 71 is formed of a polycarbonate that is a transparent resin, and the conductive layer 72 is formed of a resin composition in which carbon nanofibers are dispersed in a polycarbonate that is a transparent matrix resin.
[0013]
And this laminated body 7 is manufactured as follows. That is, as shown in FIG. 2, first, polycarbonate pellets as a matrix resin are fed from the first raw material supply conduit 11a to the hopper body 11 of the hopper 1, and the carbon nano-striates from the second raw material supply conduit 11b. Commercially available carbon nanotube dispersion pellets in which carbon nanotubes are pre-dispersed by a known method are respectively supplied and stirred and mixed by the agitator 12 in the hopper main body 11, and the resulting mixture is passed through the Hoppe conduit 13 in FIG. A two-screw type twin-screw extruder (hereinafter referred to as “extruder” only) 2 as shown in the drawing is supplied into the extruder 2 and melt-kneaded in the extruder 2.
[0014]
Further, carbon dioxide gas as a resin plasticizing gas is supplied from a gas supply port 22 provided at a position where the molten resin downstream from the supply port 21 is filled, and the temperature and pressure are set to a supercritical state of carbon dioxide gas. After further melt-kneading, the carbon dioxide dissolved in the resin is discharged from the gas outlet 23 to the outside of the cylinder 25, and then continuously from the pelleting die 3 provided at the tip of the extruder 2 as a strand 4a. Extruded and air cooled while receiving from below by the belt conveyor 5. And the cooled strand 4a is cut | disconnected shortly with the pelletizer 6, and the conductive pellet 4b of carbon nanotube dispersion | distribution is obtained.
[0015]
Next, although not shown, the conductive pellets 4b thus obtained are melted from the conductive layer molding extruder and the polycarbonate is melted from the base layer molding extruder and supplied to the feed block. After being laminated, the film-like laminate 7 is obtained by coextrusion into the inside of the T die.
[0016]
In FIG. 2, 24 is a screw, and 26 is a heater unit. Although this heater unit 26 is not shown, a water-cooling coil for water cooling is built in together with an electric resistance heater for heating. The control unit controls the material flowing in the heater unit 26 and the cylinder 25 so as to have an appropriate temperature.
[0017]
As described above, the laminate 7 is formed by dispersing carbon nanofibers in a polycarbonate whose conductive layer 72 is a transparent resin. That is, the carbon nanofibers are in a state of being twisted and dispersed in a state of being entangled with the adjacent carbon nanofibers, and sufficient conductivity is ensured with a small amount, and the diameter of the carbon nanofibers is extremely high on the order of nanometers. Since it is fine, light is transmitted smoothly and transparency is not hindered. In addition, since only a small amount of carbon nanotubes need to be dispersed, the flexibility of the matrix resin is not hindered, and it is excellent in durability against repeated bending. Therefore, it can be suitably used for a touch panel or the like.
[0018]
Further, as described above, when the polycarbonate as the matrix resin and the carbon nanotubes are melt-kneaded in the extruder 2, if the carbon dioxide gas is supplied, the viscosity of the polycarbonate decreases, and the resin due to frictional resistance. The polycarbonate and the carbon nanotube can be stirred while applying a high shearing force while suppressing the heat generation. Moreover, due to the high dispersibility of the carbon dioxide gas, which is a supercritical fluid, the carbon nanotubes are dispersed in the polycarbonate in a state where the carbon nanotubes are eliminated from the nano-base.
Therefore, the required conductivity can be ensured only by adding a smaller amount of carbon nanotubes, and a laminate including a conductive layer can be obtained at a low cost.
[0019]
In addition, since carbon dioxide gas is used as the resin plasticizing gas, even if the exhausted carbon dioxide gas leaks into the atmosphere, there is almost no adverse effect on the environment, and there is no fear of ignition etc., which is safe. .
[0020]
The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the extruder is a double-screw type twin-screw extruder in the above-described embodiment, but a triple-screw type twin-screw extruder or a single-screw extruder may be used.
In the above embodiment, the conductive layer 72 is laminated on one surface of the base material layer 71. However, a sandwich structure may be used, or a plurality of conductive layers may be provided.
[0021]
In the above embodiment, the conductive pellets 4b are obtained using the existing pellets containing carbon nanofibers as raw materials. However, the carbon nanofiber powder may be directly mixed and dispersed in the matrix resin. I do not care.
In the above embodiment, the conductive layer 72 and the base material layer 71 are laminated in the feed block, but a multi-manifold may be used.
[0022]
【The invention's effect】
Since the laminated body concerning this invention is comprised as mentioned above, it can be made to be rich in transparency, electroconductivity, and a softness | flexibility. Therefore, it can be suitably used for a touch panel or the like.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a laminate according to the present invention.
2 is a view schematically showing an example of an apparatus used for producing a carbon nanotube-dispersed resin composition used for the conductive layer of the laminate of FIG. 1. FIG.
3 is a cross-sectional view of the extruder of the apparatus of FIG.
FIG. 4 is a cross-sectional view of a conventional touch panel.
[Explanation of symbols]
7 Laminate 71 Base Layer 72 Conductive Layer

Claims (2)

A touch panel comprising a base material layer made of a transparent resin and a conductive layer laminated on the base material layer , wherein the conductive layer is disposed to face the substrate side conductive layer and comes into contact with the substrate side conductive layer to be in an energized state A sheet-like resin laminate for a touch panel , wherein the conductive layer is made of a resin composition in which carbon nanowires are dispersed in a transparent matrix resin. A sheet-like resin laminate for a touch panel comprising a base material layer made of a transparent resin and a conductive layer laminated on the base material layer is formed on a substrate via a spacer in a state where the conductive layer faces the substrate-side conductive layer. It is a touch panel arranged at a predetermined interval on the upper side,
The touch panel, wherein the conductive layer of the sheet-like resin laminate for a touch panel is made of a resin composition in which carbon nanowires are dispersed in a transparent matrix resin.

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