WO2018207579A1 - Composite member and touch panel - Google Patents

Abstract

Provided are a composite member and a touch panel, which have excellent bending resistance. The composite member is formed by laminating at least two layers of laminate constituent bodies, and each laminate constituent body comprises one cover material and one adhesive layer. The touch panel has the composite member.

Description

Composite member and touch panel

The present invention relates to a composite member having a laminated structure and a touch panel having the composite member, and more particularly to a composite member usable as a protective layer and a touch panel having the composite member.

2. Description of the Related Art In recent years, various electronic devices such as tablet computers and mobile information devices such as smartphones are used in combination with a display device such as a liquid crystal display device, and a touch panel that performs input operations to the electronic device by touching a screen Is spreading.
Furthermore, device development is progressing in a form in which the touch panel is bent or rounded. As a result, the electronic device can be made compact and a stylish design can be achieved, which can be used as appeal points.

In order to bend the touch panel, each member constituting the touch panel needs to have resistance to bending such as not being broken, not being broken, and not losing performance. In particular, folding characteristics are important for cover materials, touch panels, and panels, and studies on each of them are in progress.
A cover material that has bending resistance and resistance to touch, such as hardness, is very important. For example, polyimide has been developed as a base material having a relatively high resistance to bending and a high elastic modulus capable of suppressing deformation against touch. It is necessary to reconcile the flexibility of bending and the contradictory performance of hardness that does not transform into a touch.

Usually, the laminate is subjected to compressive stress on the inside according to bending and tensile stress on the outside, and therefore, a device has been devised in which a weak member is positioned at an intermediate point where the stress becomes zero. For example, in the flexible touch screen panel of Patent Document 1, the wiring layer of the flexible film is on the neutral surface of the flexible film. The wiring layer is further protected by a flexible replenishment film and suppresses the occurrence of defects due to cracks in the wiring layer when bent. Note that the neutral surface is a region where no stress is substantially applied when the flexible touch screen panel is bent.
Patent Document 2 discloses a display having a neutral surface on a display element or a thin film sealing layer.

In addition to the above-described ones, a layer having a very low elastic modulus is intentionally inserted as a stress relaxation layer to generate a plurality of stress intermediate points, and a weak base material is positioned at the stress intermediate point. Examples of the weak substrate portion include a wiring part such as a thin film transistor (TFT) of an organic EL (Organic electroluminescence) display, or an electrode wiring for a touch panel.
The flexible display apparatus of patent document 3 has the flexible outer member arrange | positioned on a flexible display panel, and the adhesive member arrange | positioned between a flexible display panel and a flexible outer member. The elastic modulus of the adhesive member is set so that a neutral surface is formed on each of the flexible display panel and the flexible exterior member. The elastic modulus of the adhesive member is 1/10000 to 1/1000 of the elastic modulus of the flexible display panel and the flexible outer member.

Patent Document 4 is a flexible display device having a flexible outer member disposed on a flexible display panel and a stress control member disposed between the flexible display panel and the flexible outer member. The stress control member is configured to define a first neutral surface and a second neutral surface on each of the flexible display panel and the flexible outer member when the flexible display device is bent.

US Patent Application Publication No. 2014/0354558 US Patent Application Publication No. 2015/0268914 US Patent Application Publication No. 2015/0201487 US Patent Application Publication No. 2015/0200375

However, in Patent Documents 1 to 4 described above, bending resistance is exhibited by generating an intermediate point where the stress becomes zero. However, even if the above-described intermediate point is generated, if the absolute value of the acting stress is large, bending resistance cannot be obtained.

An object of the present invention is to provide a composite member and a touch panel that solve the above-described problems based on the prior art and have excellent bending resistance.

In order to achieve the above-mentioned object, the present invention is a laminate in which at least two layers are laminated, and the laminate is composed of one cover material and one adhesive layer. A composite member is provided.
The cover material preferably has a film thickness of 50 μm or less.
The adhesive layer preferably has a thickness of 25 μm or less, and the adhesive layer more preferably has a thickness of 20 μm or less.

It is preferable that the number of stacked layers is 5 or more.
The cover material is preferably composed of at least one of polyimide, polyamide, cycloolefin polymer, polyethylene terephthalate, triacetyl cellulose, and cycloolefin copolymer.
The composite member is preferably used for the protective layer of the touch panel.
Moreover, this invention provides the touchscreen which has the above-mentioned composite member.

According to the present invention, a composite member and a touch panel having excellent bending resistance can be obtained.

It is a schematic diagram which shows a 2 layer composite member. It is a graph which shows the stress which acts when a 2 layer composite member is bent. It is a schematic diagram which shows a 4 layer composite member. It is a graph which shows the stress which acts when a 4 layer composite member is bent. It is a schematic diagram which shows a composite member of 8 layers. It is a graph which shows the stress which acts when bending the composite member of 8 layers. It is a schematic diagram which shows the display apparatus which has the composite member of embodiment of this invention. It is typical sectional drawing which shows an example of the composite member of embodiment of this invention. It is typical sectional drawing which shows the other example of the composite member of embodiment of this invention. It is a typical top view which shows an example of the touch sensor part used for a display apparatus. It is typical sectional drawing which shows an example of the touch sensor part used for a display apparatus. It is a top view which shows arrangement | positioning of the metal fine wire of the touch sensor part used for a display apparatus. It is typical sectional drawing which shows the other example of the touch sensor part used for a display apparatus. It is a typical perspective view which shows the 1st example of the display apparatus which has the composite member of embodiment of this invention. It is a typical perspective view which shows the use condition of the 1st example of the display apparatus which has the composite member of embodiment of this invention. It is a typical perspective view which shows the 2nd example of the display apparatus which has the composite member of embodiment of this invention. It is a typical perspective view which shows the use condition of the 2nd example of the display apparatus which has the composite member of embodiment of this invention. It is a typical perspective view which shows the 3rd example of the display apparatus which has the composite member of embodiment of this invention. It is a schematic diagram which shows the 4th example of the display apparatus which has a composite member of embodiment of this invention. It is a schematic diagram which shows the 1st example of the conventional composite member. It is a graph which shows the stress which acts when the 1st example of the conventional composite member is bent. It is a schematic diagram which shows the 2nd example of the conventional composite member. It is a graph which shows the stress which acts when the 2nd example of the conventional composite member is bent. It is a schematic diagram which shows the 3rd example of the conventional composite member. It is a graph which shows the stress which acts when the 3rd example of the conventional composite member is bent.

Hereinafter, based on a preferred embodiment shown in the accompanying drawings, a composite member and a touch panel of the present invention will be described in detail.
In addition, the figure demonstrated below is an illustration for demonstrating this invention, and this invention is not limited to the figure shown below.
In the following, “to” indicating a numerical range includes numerical values written on both sides. For example, when ε is a numerical value α1 to a numerical value β1, the range of ε is a range including the numerical value α1 and the numerical value β1, and expressed by mathematical symbols, α1 ≦ ε ≦ β1.
Unless otherwise specified, angles such as “an angle represented by a specific numerical value”, “parallel”, “vertical”, and “orthogonal” include an error range generally allowed in the corresponding technical field.
The term “transparent” means that the light transmittance is at least 60% or more, preferably 75% or more, more preferably 80% or more, and even more preferably 85% in the visible light wavelength range of 400 to 800 nm. That is all. The light transmittance is measured using “Plastic—How to obtain total light transmittance and total light reflectance” defined in JIS (Japanese Industrial Standard) K 7375: 2008.

As a result of diligent study, the inventor of the present invention has a member 10 (see FIG. 1) having a low elastic modulus comparable to that of a transparent adhesive film (OCA (Optically Clear Clear Adhesive)), and an elastic modulus of polyethylene terephthalate (PET). , A laminate 12 (see FIG. 1) in which a member 11 (see FIG. 1) having a high elastic modulus comparable to that of a plastic film such as cycloolefin polymer (COP) and polyimide (PI) is laminated. When bent to the inside, stress relaxation always occurs in the member 10 (see FIG. 1) such as a transparent adhesive film having a low elastic modulus, and the stress of the tensile component and the stress of the compression component are generated in the member 11 such as the plastic film. It was found to be distributed (see the graph shown in FIG. 2). In addition, the code | symbol 10a shown in FIG. 2 shows the stress which acts on the member 10, and the code | symbol 11a shows the stress which acts on the member 11. FIG.

From the above, even if the elastic modulus is not extremely low as in Patent Document 3 described above, stress relaxation always occurs if the elastic modulus is comparable to that of the transparent adhesive film. For this reason, tensile stress and compressive stress can be distributed in each layer of a laminated body by comprising the laminated body 12 (refer FIG. 1) containing members 10 (refer FIG. 1), such as the above-mentioned transparent adhesive film.
As a result of further study in consideration of the above-mentioned points, as for the laminated body 12 (see FIG. 1) in which the cover material and the transparent adhesive film are laminated, the thin cover material and the thin transparent adhesive film are used rather than bending the laminated body as it is. As shown in FIGS. 4 and 6, the laminated body 12 having a plurality of layers as shown in FIGS. 3 and 5 is compared with the stress Ds acting on the entire laminated body 12 shown in FIG. It has been found that the stress Ds acting on the entire laminate 12 is reduced, and the bending resistance is further improved. This is because stress relaxation occurs in the member 10 such as a transparent adhesive film, and the tensile stress and the compressive stress are applied to each of the thin layers, thereby reducing the distortion of each cover material. It is presumed to be caused by the fact that the cutting was not reached.
3 and 5, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. 4 and 6, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted. 3 shows a total of four layers of the members 10 and 11 alternately stacked, and FIG. 5 shows a total of eight layers of the members 10 and 11 alternately stacked.

In addition, when the conventional laminated body 102 in which the low elastic modulus member 100 and the high elastic modulus member 101 shown in FIG. 20 are laminated so that the member 101 is inside, as shown in FIG. A compressive stress acts on the member 101, and a tensile stress acts on the member 100.
As shown in FIG. 22, when the low elastic modulus member 100 and the high elastic modulus member 101 are alternately laminated in a total of four layers, when the member 101 is bent so as to be inside, as shown in FIG. The inner member 101 when bent is subjected to compressive stress, the next member 100 is subjected to compressive stress, the next member 101 is subjected to tensile stress, and the next member 100 is also subjected to tensile stress. The stress Ds acting on the entire laminated body 102 shown in FIG. 23 is larger than the stress Ds acting on the entire laminated body 12 shown in FIG. 4 having the same layer configuration as that of the laminated body 102 shown in FIG.

In addition, when the low elastic modulus member 100 and the high elastic modulus member 101 shown in FIG. 24 are alternately laminated in a total of eight layers, if the member 101 is bent so as to be inside, the bending as shown in FIG. The compressive stress or tensile stress acts on each member sequentially from the inner member 101 at the time. The stress Ds acting on the entire laminated body 102 shown in FIG. 25 is larger than the stress Ds acting on the entire laminated body 12 shown in FIG. 6 having the same layer configuration as that of the laminated body 102 shown in FIG. For this reason, in the conventional laminated body 102, the stress Ds acting on the entire laminated body 102 when bent is large, thereby causing peeling at the interface between the member 100 and the member 101 of the laminated body 102, and the laminated body. 102 buckling or cutting of the laminate 102 occurs.
21, 23, and 25, reference numeral 100 a indicates stress acting on the member 100, and reference numeral 101 a indicates stress acting on the member 101.

Next, the composite member will be described in detail. The composite member is used as a protective layer, for example. The use of the composite member is not limited to the protective layer. In addition to the protective layer described above, examples of the use of the composite member include a cover material, a protective substrate on the back side such as a touch panel described later, and a functional film substrate such as a sensor and an optical film.
Hereinafter, as an application example of the composite member, a display device using the composite member as a protective layer will be described.
FIG. 7 is a schematic view showing a display device having a composite member according to an embodiment of the present invention. FIG. 8 is a schematic cross-sectional view showing an example of the composite member of the embodiment of the present invention, and FIG. 9 is a schematic cross-sectional view of another example of the composite member of the embodiment of the present invention.

The display device 20 illustrated in FIG. 7 has a function of detecting contact with a finger or the like. The display device 20 includes a display unit 22, a touch sensor unit 24, an antireflection layer 26, a protective layer 28, and a controller 29. Further, a transparent layer 23 provided between the display unit 22 and the touch sensor unit 24, a transparent layer 25 provided between the touch sensor unit 24 and the antireflection layer 26, an antireflection layer 26 and a protective layer. And a transparent layer 27 provided between them. In the display device 20, the surface 28 a of the protective layer 28 is a viewing surface of a display object (not shown) displayed in the display area (not shown) of the display unit 22. Moreover, the surface 28a of the protective layer 28 is a touch surface with which a finger etc. contact. The protective layer 28 is composed of the composite member described above. In the display device 20 illustrated in FIG. 7, for example, the touch sensor unit 24, the transparent layer 25, the antireflection layer 26, the transparent layer 27, the protective layer 28, and the controller 29 constitute a touch panel 36.
By forming the protective layer 28 from the above-described composite member, even if the display device 20 is bent so that the surface 28a of the protective layer 28 is on the inside, peeling of each layer can be suppressed.

As the protective layer 28, for example, as shown in FIG. 8, a composite member in which the laminated structure 30 is laminated in two layers, for example, can be used. The laminated structure 30 includes one cover material 32 and one adhesive layer 33.
The composite member is a laminate in which at least two layers of laminated structures are laminated, and the number of laminated layers is preferably five or more, that is, a laminate of five or more layers. The number of stacked layers refers to the number of stacked structures that are stacked. For this reason, for example, a configuration in which five layers of the stacked structure 30 are stacked as in the protective layer 28 shown in FIG. 9 may be used.
When the number of stacked layers 30 is large, the stress Ds acting on the entire protective layer 28 can be reduced from FIGS. 4 and 6 described above.
In order to suppress an increase in the total thickness of the display device 20, it is preferable that the total thickness of the films is the same even if the number of stacked layers is different. For this reason, it is preferable that the protective layer 28 shown in FIG. 8 and the protective layer 28 shown in FIG. 9 have the same film thickness.

The protective layer 28 also serves to protect the touch sensor unit 24 from the external environment. For this reason, it is preferable that the protective layer 28 has resistance against external force. For example, the surface 28a of the protective layer 28 preferably has impact resistance such that no traces remain due to impact. As described above, the protective layer 28 has impact resistance by the cover material 32 even in a laminated configuration.

The protective layer 28 shown in FIG. 8 and the protective layer 28 shown in FIG. 9 can be produced by laminating and laminating the cover material 32 and the adhesive layer 33. A known method can be used to bond the cover material 32 and the adhesive layer 33 together. For example, the cover material 32 and the adhesive layer 33 are temporarily bonded using a roller, and then exposed to a preset temperature and pressure environment using an autoclave for a preset time, and then preset. By leaving for a period of time, the cover layer 32 and the adhesive layer 33 can be bonded together to produce the protective layer 28. In addition, the cover material 32 and the adhesive layer 33 can also be bonded together using a vacuum bonding apparatus.

The cover member 32 preferably has a high elastic modulus from the viewpoint of touch resistance, but if the elastic modulus is too high and too hard, the bending characteristics deteriorate. Therefore, the cover member 32 preferably has an elastic modulus of 10 ⁻¹ to 30 GPa. The elastic modulus is a tensile elastic modulus. The elastic modulus can be measured by a dynamic elastic modulus measuring device or a micro hardness tester (picodenter).
The cover material 32 preferably has a film thickness of 100 μm or less, and more preferably 50 μm or less. Considering the bending characteristics, it is preferable that the thickness of the cover material 32 is as thin as the outer layer, that is, the protective layer 28 is closer to the surface 28a. The film thickness of the cover material 32 can be obtained by measuring the thickness of the cover material 32 itself before producing the protective layer 28. In addition, about the cover material 32, it is preferable that there is a film thickness which has sufficient hardness and handling property, and it is preferable that a film thickness is 1 micrometer or more, and it is more preferable that it is 5 micrometers or more.
The film thickness of the cover material 32 can be obtained, for example, by observing the cross section with an electron microscope. About the cover material 32 single-piece | unit, it can also measure using film thickness meters, such as a micrometer.
The cover material 32 is composed of at least one of polyimide (PI), polyamide (PA), cycloolefin polymer (COP), polyethylene terephthalate (PET), triacetyl cellulose (TAC), and cycloolefin copolymer (COC). It is preferred that The cover material 32 is more preferably polyimide (PI), polyamide (PA), cycloolefin polymer (COP), polyethylene terephthalate (PET), triacetyl cellulose (TAC), or cycloolefin copolymer (COC).

It is preferable that the adhesive force at the interface between the cover material 32 and the adhesive layer 33 is higher from the viewpoint of suppressing peeling. The adhesion at the interface between the cover material 32 and the adhesive layer 33 is preferably 0.1 N / mm or more, more preferably 0.4 N / mm or more, and particularly preferably 0.7 N / mm or more.
The adhesion strength at the interface between the cover material 32 and the adhesive layer 33 is a value measured by a 180 degree peel test.
The adhesive layer 33 preferably has an elastic modulus of 10 ⁻² to 10 ⁻⁶ GPa. As the adhesive layer 33, for example, MO-3015C (product name), MO-3015G (product name), MO-3015H (product name), and MO-3015I (product name) manufactured by Lintec Corporation can be used. The elastic modulus is a tensile elastic modulus. The elastic modulus can be measured by a dynamic elastic modulus measuring device or a micro hardness tester (picodenter).
The adhesive layer 33 preferably has a film thickness of 25 μm or less, and more preferably 20 μm or less. The thickness of the pressure-sensitive adhesive layer 33 can be determined by measuring the thickness of the pressure-sensitive adhesive layer 33 itself before producing the protective layer 28.
The adhesive layer 33 preferably has a sufficient mechanical strength and a film thickness for stress relaxation. The film thickness is preferably 1 μm or more, and more preferably 5 μm or more.
The film thickness of the adhesion layer 33 can be calculated | required by observing a cross section with an electron microscope, for example. About the adhesion layer 33 single-piece | unit, it can also measure using film thickness meters, such as a micrometer.

In the composite member, the film thicknesses of the cover material 32 and the adhesive layer 33 may be different for each laminated structure 30. As described above, it is preferable that the cover material 32 is thinner as the outer layer and the protective layer 28 are closer to the surface 28a. Therefore, the laminated structure 30 on the surface 28a side is thinner in the cover material 32 and the adhesive layer 33. Is preferred. In all the laminated structures 30, the cover material 32 and the adhesive layer 33 may have the same film thickness.
The optimum combination of the configurations of the stacked structural body 30 of the protective layer 28 and the stacked configuration can also be determined using simulation such as a finite element method using a computer.

Hereinafter, another configuration of the display device 20 will be described.
The display unit 22 includes a display area (not shown) for displaying an image or the like, and includes, for example, a liquid crystal display panel or an organic EL (Organic electroluminescence) display panel. As the display unit 22, a vacuum fluorescent display (VFD), a plasma display panel (PDP), a surface electric field display (SED), a field emission display (FED), electronic paper, and the like can be used in addition to the above.

The transparent layer 23, the transparent layer 25, and the transparent layer 27 are all optically transparent and insulative, and the configuration thereof is not particularly limited as long as a stable fixing force can be exhibited. Absent. As the transparent layer 23, the transparent layer 25, and the transparent layer 27, for example, an optically transparent resin (OCR, Optical) such as an optically transparent adhesive (OCA, Optical Clear Adhesive) and UV (Ultra Violet) curable resin is used. Clear Resin) can be used. For example, MO-3015C (product name), MO-3015G (product name), MO-3015H (product name), and MO-3015I (product name) manufactured by Lintec Corporation are used as the transparent layer 23, the transparent layer 25, and the transparent layer 27. be able to.

The touch sensor unit 24 detects contact of a finger or the like with the surface 28 a of the protective layer 28 in the display device 20. The touch sensor unit 24 may be a capacitance type or a resistance film type.
As the controller 29, a controller corresponding to the touch sensor unit 24 is appropriately used. If the touch sensor unit 24 is a capacitance type, the controller 29 detects the position where the capacitance has changed. If the touch sensor unit 24 is a resistive film type, the controller 29 detects the position where the resistance has changed.

The touch sensor unit 24 will be described using a capacitive touch sensor as an example.
As shown in FIG. 10, the touch sensor unit 24 includes a substrate 40, detection electrodes formed on both surfaces of the substrate 40, and peripheral wirings formed around the detection electrodes and electrically connected to the detection electrodes. And have. A plurality of first detection electrodes 42 that extend along the first direction Y on the surface 40a (see FIG. 11) of the substrate 40 and are arranged in parallel in the second direction X orthogonal to the first direction Y. A plurality of first peripheral wirings 43 electrically connected to the plurality of first detection electrodes 42 are arranged close to each other. Similarly, a plurality of second detection electrodes 44 extending along the second direction X and arranged in parallel in the first direction Y are formed on the back surface 40b (see FIG. 11) of the substrate 40. A plurality of second peripheral wirings 45 electrically connected to the plurality of second detection electrodes 44 are arranged close to each other. The first detection electrode 42 and the plurality of second detection electrodes 44 are detection electrodes.
In the touch sensor unit 24, a region in the substrate 40 where a plurality of first detection electrodes 42 and a plurality of second detection electrodes 44 are overlapped in plan view is a detection region 47. The detection area 47 is an area in which contact with a finger or the like can be detected.

As shown in FIG. 11, the first detection electrode 42 is composed of, for example, a fine metal wire 50 formed on the surface 40 a of the substrate 40. The fine metal wires 50 of the first detection electrodes 42 are arranged in a mesh pattern, for example, as shown in FIG. As shown in FIG. 11, the second detection electrode 44 is constituted by a thin metal wire 50 formed on the back surface 40 b of the substrate 40, for example. For example, as shown in FIG. 12, the fine metal wires 50 of the second detection electrode 44 are arranged in a mesh pattern.
The first peripheral wiring 43 and the second peripheral wiring 45 are constituted by, for example, metal thin wires 50. Note that the first peripheral wiring 43 and the second peripheral wiring 45 are not particularly limited to being configured by the fine metal wires 50, and are configured by conductive wirings having line widths, thicknesses, and the like that are different from the fine metal wires 50. May be. The first peripheral wiring 43 and the second peripheral wiring 45 can be formed of, for example, a strip-shaped conductor. In this case, the first detection electrode 42 and the plurality of second detection electrodes 44 are constituted by the metal thin wires 50, and the first peripheral wiring 43 and the second peripheral wiring 45 are constituted by other things.

The touch sensor unit 24 is not particularly limited to the configuration illustrated in FIG. 11. For example, the touch sensor unit 24 includes one detection electrode on one substrate 40 and one substrate 41 as illustrated in FIG. 13. The structure which provides may be sufficient. A thin metal wire 50 constituting the first detection electrode 42 is provided on the front surface 40a of one substrate 40, and a second detection electrode 44 is formed on the back surface 40b of the substrate 40 via the adhesive layer 52. A configuration in which the substrate 40 provided with the thin metal wires 50 is stacked may be employed. The substrate 41 has the same configuration as the substrate 40. The adhesive layer 52 can be the same as the transparent layer 23 described above.
The touch sensor unit 24 is not limited to a capacitive touch sensor, but may be a resistive touch sensor. Each component of the touch sensor unit 24 will be described later.

The antireflection layer 26 includes a linear polarizer and a λ / 4 plate. In the antireflection layer 26, a polarizer is disposed on the touch sensor unit 24 side, and a λ / 4 plate is disposed on the protective layer 28 side. The λ / 4 plate is a plate having a λ / 4 function. The λ / 4 plate may be a single-layer λ / 4 plate or a broadband λ / 4 plate in which a λ / 4 plate and a λ / 2 plate are laminated.
The thickness of the antireflection layer 26 is not particularly limited, but is preferably 1 to 100 μm, and more preferably 1 to 50 μm.

The linear polarizer of the antireflection layer 26 may be a member having a function of converting light into specific linearly polarized light, and an absorptive polarizer can be mainly used.
As the absorption polarizer, an iodine polarizer, a dye polarizer using a dichroic dye, a polyene polarizer, or the like is used. Iodine polarizers and dye polarizers include coating polarizers and stretchable polarizers, both of which can be applied. Polarized light produced by adsorbing iodine or dichroic dye to polyvinyl alcohol and stretching. A child is preferred.
In addition, as a method for obtaining a polarizer by stretching and dyeing in the state of a laminated film in which a polyvinyl alcohol layer is formed on a substrate, Patent No. 5048120, Patent No. 5143918, Patent No. 5048120, Patent No. 4691205, Japanese Patent No. 4751481, and Japanese Patent No. 4751486 can be cited, and known techniques relating to these polarizers can also be preferably used.

The λ / 4 plate is a plate having a function of converting linearly polarized light having a specific wavelength into circularly polarized light or converting circularly polarized light into linearly polarized light. More specifically, the plate has an in-plane retardation value of λ / 4 (or an odd multiple thereof) at a predetermined wavelength λnm.
The in-plane retardation value (Re (550)) at a wavelength of 550 nm of the λ / 4 plate may have an error of about 25 nm centered on the ideal value (137.5 nm), for example, 110 to 160 nm. It is preferably 120 to 150 nm, more preferably 130 to 145 nm.

The angle formed by the absorption axis of the polarizer and the in-plane slow axis of the λ / 4 plate is preferably in the range of 45 ° ± 3 °. In other words, the angle is preferably in the range of 42 ° to 48 °. The angle is preferably in the range of 45 ° ± 2 ° in that the antireflection effect is more excellent.
In addition, the above-mentioned angle intends an angle formed by the absorption axis of the polarizer and the in-plane slow axis of the λ / 4 plate when viewed from the normal direction of the surface of the polarizer.
When the above-mentioned broadband λ / 4 plate is used as the λ / 4 plate, the angle formed by the in-plane slow axis of the λ / 4 plate and the in-plane slow axis of the λ / 2 plate is 60 °. And the λ / 2 plate side is arranged on the incident side of the linearly polarized light, and the in-plane slow axis of the λ / 2 plate intersects the polarizing surface of the incident linearly polarized light at 15 ° or 75 °. It is preferable to use it.
The above-mentioned angles are the absorption axis of the polarizer and the in-plane slow axis of the λ / 4 plate, the absorption axis of the polarizer and the λ / 2 plate when viewed from the normal direction of the surface of the polarizer. An angle formed with the in-plane slow axis is intended.

The display device 20 can be bent, rounded, bent or the like, and can be used as a flexible device having a touch function. By using the protective layer 28 as a composite member, the display device 20 maintains impact resistance and is excellent in bending resistance. For this reason, even if it repeats bending the display apparatus 20 so that the surface 28a of the protective layer 28 may become inside, it is suppressed that it bends or peels.

In the display device 20, the thickness excluding the display portion 22 is preferably 50 to 1200 μm and preferably 100 to 600 μm from the viewpoint of being applicable to a flexible device that can be bent with a bending radius (curvature radius) of 5 mm or less. It is more preferable.

Next, as an application example of the composite member, another example of a display device using the composite member as a protective layer will be described.
FIG. 14 is a schematic perspective view showing a first example of a display device having a composite member according to an embodiment of the present invention, and FIG. 15 shows a first example of a display device having a composite member according to an embodiment of the present invention. It is a typical perspective view which shows a use condition. 14 and 15, the same components as those in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

The display device 20 having the configuration illustrated in FIG. 7 may be configured to be folded, for example, like the display device 60 illustrated in FIG. Although not shown in detail, the display device 60 has the same configuration as the display device 20. The display area 60d of the display device 60 corresponds to the surface 28a of the protective layer 28 described above. The display device 60 is divided into a central part 60a, a first side part 60b, and a second side part 60c. The display device 60 has a double-open structure. FIG. 14 shows a state in which the first side portion 60b and the second side portion 60c are folded close to the central portion 60a. In this case, the end portion 60e is bent so that the display region 60d is on the inner side. Since the display device 60 has the bending resistance like the display device 20 described above, even if the first side portion 60b and the second side portion 60c are repeatedly opened and closed, the occurrence of folding, peeling, or the like is suppressed. .
In the display device 60, when the entire display area 60d is used, the first side portion 60b and the second side portion 60c are opened as shown in FIG. In addition, it can also be used in the state which opened either the 1st side part 60b and the 2nd side part 60c.

FIG. 16 is a schematic perspective view showing a second example of the display device having the composite member according to the embodiment of the present invention, and FIG. 17 shows a second example of the display device having the composite member according to the embodiment of the present invention. It is a typical perspective view which shows a use condition. 16 and 17, the same components as those in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.
The display device 20 having the configuration illustrated in FIG. 7 may be configured to be folded, for example, like the display device 62 illustrated in FIG. Although not shown in detail, the display device 62 has the same configuration as the display device 20. The display area 62c of the display device 62 corresponds to the surface 28a of the protective layer 28 described above. The display device 62 is divided into a first side portion 62a and a second side portion 62b. The display device 62 has a single-open structure. FIG. 16 shows a state in which the first side portion 62a and the second side portion 62b are combined and folded. In this case, the end 62d is bent so that the display area 62c is on the inside. Since the display device 62 has the bending resistance as in the case of the display device 20 described above, the occurrence of folding and peeling is suppressed.
In the display device 62, when the display area 62c is used, the first side portion 62a and the second side portion 62b are opened as shown in FIG.

FIG. 18 is a schematic perspective view showing a third example of the display device having the composite member according to the embodiment of the present invention. In FIG. 18, the same components as those in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.
The display device 20 having the configuration shown in FIG. 7 can be wound around the core 65, for example, like the display device 64 shown in FIG. Although not shown in detail, the display device 64 has the same configuration as the display device 20. The display area 64a of the display device 64 corresponds to the surface 28a of the protective layer 28 described above. The display device 64 is wound around the core 65 so that the display area 64a is on the inside. Since the display device 64 has bending resistance as in the case of the display device 20 described above, the occurrence of folding and peeling is suppressed.
In the display device 64, the display device 64 is pulled out when the display area 64a is used.

In addition, the display device 20 illustrated in FIG. 7 includes the touch sensor unit 24, but is not limited thereto. For example, a configuration in which the protective layer 28 is provided on the display unit 22 via the transparent layer 54 as in the display device 21 shown in FIG. In this case, an image or the like displayed on the display unit 22 is recognized through the surface 28a of the protective layer 28. The transparent layer 54 has the same configuration as the transparent layer 23 described above.
The display device 21 is different from the display device 20 only in that the touch sensor unit 24 is not provided. Therefore, the display device 21 can have the configuration of the display device 60 shown in FIG. 14, the display device 62 shown in FIG. 16, and the display device 64 shown in FIG.

Hereinafter, the touch sensor unit 24 will be described.
<Board>
The type of the substrate 40 is not particularly limited as long as it can support the first detection electrode 42 and the second detection electrode 44. As the substrate 40, a transparent base material is preferable, and a plastic film is more preferable.
Specific examples of the material constituting the substrate 40 include TAC (triacetyl cellulose), PET (polyethylene terephthalate), PI (polyimide), COP (polycycloolefin), COC (polycycloolefin copolymer), polycarbonate, ( (Meth) acrylic resin, PEN (polyethylene naphthalate), PE (polyethylene), PP (polypropylene), polystyrene, polyvinyl chloride, or polyvinylidene chloride is preferable, TAC, PET, PI, COP, or COC is more preferable, PET Or COP is more preferred. “(Meth) acryl” represents both or one of acrylic and methacrylic.
As a plastic film, it is preferable that melting | fusing point is about 290 degrees C or less.
The total light transmittance of the substrate 40 is preferably 85 to 100%.
The thickness of the substrate 40 is not particularly limited, but can usually be arbitrarily selected in the range of 25 to 500 μm. In particular, since the thinner substrate 40 is suitable for bending, the thickness of the substrate 40 is preferably 25 to 80 μm, more preferably 25 to 60 μm, and even more preferably 25 to 40 μm.

As another preferred embodiment of the substrate 40, it is preferable to have an undercoat layer containing a polymer on the surface thereof. By forming the conductive portion on the undercoat layer, the adhesion of the conductive portion is further improved.
The method for forming the undercoat layer is not particularly limited, and examples thereof include a method in which a composition for forming an undercoat layer containing a polymer is applied on the substrate 40 and subjected to heat treatment as necessary. The undercoat layer forming composition may contain a solvent, if necessary. The kind in particular of solvent is not restrict | limited, A well-known solvent is illustrated. Moreover, latex containing polymer fine particles may be used as the composition for forming an undercoat layer containing polymer.
The thickness of the undercoat layer is not particularly limited, but is preferably 0.02 to 0.3 μm, more preferably 0.03 to 0.2 μm, from the viewpoint that the adhesion of the conductive portion is more excellent.

<Metallic thin wire>
The line width w of the fine metal wire 50 is not particularly limited, and is preferably 30 μm or less, more preferably 15 μm or less, further preferably 10 μm or less, particularly preferably 9 μm or less, particularly preferably 7 μm or less, and 0.5 μm or more. Preferably, 1.0 μm or more is more preferable. If it is the above-mentioned range, a low resistance electrode can be formed relatively easily.
When a thin metal wire is applied as a lead wire, the line width of the fine metal wire is preferably 500 μm or less, more preferably 50 μm or less, and even more preferably 30 μm or less. If it is the above-mentioned range, a low-resistance touch panel electrode can be formed comparatively easily.

The thickness t of the thin metal wire 50 is not particularly limited, but is preferably 0.001 mm to 0.2 mm, more preferably 30 μm or less, further preferably 20 μm or less, and 0.01 to 9 μm. Particularly preferred is 0.05 to 5 μm. If it is the above-mentioned range, the electrode excellent in durability can be formed comparatively easily with a low resistance electrode.
Measurement of the width w and thickness t of the fine metal wire 50 first acquires a cross-sectional image of the fine metal wire 50 using a scanning electron microscope. Next, the width w and the thickness t of the thin metal wire 50 are obtained from the cross-sectional image.

The pattern composed of the fine metal wires 50 is not limited to a mesh shape, but is a triangle such as a regular triangle, an isosceles triangle, and a right triangle, a square, a rectangle, a rhombus, a parallelogram, a quadrangle such as a trapezoid, a (positive) hexagon, And a geometric figure combining (positive) n-gons such as (positive) octagons, circles, ellipses, and stars.

In addition, as shown in FIG. 12, the mesh shape intends a shape including a plurality of openings (lattices) configured by intersecting metal fine wires 50. The opening is an opening region surrounded by the thin metal wire 50.
The length of one side of the opening is preferably 800 μm or less, more preferably 600 μm or less, further preferably 400 μm or less, preferably 5 μm or more, more preferably 30 μm or more, and further preferably 80 μm or more.
From the viewpoint of visible light transmittance, the aperture ratio is preferably 85% or more, more preferably 90% or more, and still more preferably 95% or more. The aperture ratio corresponds to the ratio of the transmissive portion excluding the fine metal wires 50 in the surface 40a of the substrate 40 to the entire surface 40a.

Examples of the metal contained in the metal thin wire 50 include metals or alloys such as gold (Au), silver (Ag), copper (Cu), and aluminum (Al). Among these, silver is preferable because the conductivity of the fine metal wire is excellent.
In the metal fine wire 50, it is preferable that the binder is contained from a viewpoint of the adhesiveness of the metal fine wire and the board | substrate 40. FIG.
As the binder, a resin is preferable because the adhesion between the fine metal wire and the substrate 40 is more excellent. More specifically, a (meth) acrylic resin, a styrene resin, a vinyl resin, a polyolefin resin, and a polyester resin are preferable. At least one resin selected from the group consisting of resin, polyurethane resin, polyamide resin, polycarbonate resin, polydiene resin, epoxy resin, silicone resin, cellulose polymer and chitosan polymer, or these And a copolymer comprising monomers constituting the resin.

The manufacturing method of the metal fine wire 50 is not specifically limited, A well-known method is employable. For example, there is a method of exposing and developing a photoresist film on a metal foil formed on the surface of the substrate 40 to form a resist pattern, and etching the metal foil exposed from the resist pattern. Moreover, the method of printing the paste containing a metal microparticle or metal nanowire on each surface of both surfaces of the board | substrate 40, and performing metal plating to a paste is mentioned.
Furthermore, the method using silver halide other than the above-mentioned method is mentioned. More specifically, the method described in paragraphs 0056 to 0114 of JP 2014-209332 A can be mentioned.
From the viewpoint of excellent bending, a mode in which a silver fine wire is used for the metal fine wire 50 and a mesh pattern composed of the silver fine wire is included.

The present invention is basically configured as described above. Although the composite member and the touch panel of the present invention have been described in detail above, the present invention is not limited to the above-described embodiment, and various improvements or changes may be made without departing from the gist of the present invention. Of course.

The features of the present invention will be described more specifically with reference to examples. The materials, reagents, used amounts, substance amounts, ratios, processing details, processing procedures, and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Accordingly, the scope of the present invention should not be construed as being limited by the specific examples shown below.
In this example, flexible devices having the composite members of Examples 1 to 6 and Comparative Examples 1 to 3 were produced and evaluated for bending and impact. Hereinafter, the bending test and the impact deformation test will be described.

(Bending test)
The obtained flexible device was processed by an autoclave at a temperature of 40 ° C. and a pressure of 0.5 MPa for 20 minutes. Next, with respect to the processed flexible device, a folding tester (planar body unloaded U-shaped expansion / contraction tester (DLDMMLH-FS) (manufactured by Yuasa System Co., Ltd.)) is used and the bending radius is set to 2 mm and the bending is performed to 100,000. Conducted once.
In the bending test, the folding direction was set so that the inner surface when the flexible device was folded was the surface of the composite member.
The flexible device after 100,000 bending tests was visually observed, and peeling was evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1.

Bending test evaluation criteria "A": No peeling "B": Slight peeling "C": Partial peeling "D": Overall peeling

(Bump deformation test)
Using a rod having a hemispherical tip and a diameter of 2 mm, the tip of the rod was struck 1000 times perpendicular to the surface of the composite member of the flexible device. The surface of the composite member after 1000 impacts was visually observed, and the state of the surface of the composite member was evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1.
Evaluation criteria for impact deformation test “A”: no deformation “B”: slight trace “C”: trace remains “D”: strong residual

Hereinafter, the manufacturing method of the transparent conductive film which comprises a flexible device is demonstrated.
<Method for producing transparent conductive film>
(Preparation of silver halide emulsion)
To the following 1 liquid maintained at a temperature of 38 ° C. and a pH of 4.5 (potential of hydrogen) 4.5, an amount corresponding to 90% of each of the following 2 liquid and 3 liquids was simultaneously added over 20 minutes while stirring, and 0.16 μm of Nuclear particles were formed. Subsequently, the following 4 and 5 solutions were added over 8 minutes, and the remaining 10% of the following 2 and 3 solutions were added over 2 minutes to grow to 0.21 μm. Further, 0.15 g of potassium iodide was added and ripened for 5 minutes to complete the grain formation.

1 liquid:
750 ml of water
Gelatin ... 9g
Sodium chloride 3g
1,3-dimethylimidazolidine-2-thione ... 20mg
Sodium benzenethiosulfonate ... 10mg
Citric acid ... 0.7g
Two liquids:
300 ml of water
Silver nitrate ... 150g
3 liquids:
300 ml of water
Sodium chloride ... 38g
Potassium bromide 32g
Potassium hexachloroiridium (III) (0.005% KCl 20% aqueous solution) 8 ml
Ammonium hexachlororhodate (0.001% NaCl 20% aqueous solution) ... 10ml
4 liquids:
Water ... 100ml
Silver nitrate ... 50g
5 liquids:
Water ... 100ml
Sodium chloride ・ ・ ・ 13g
Potassium bromide ... 11g
Yellow blood salt ... 5mg

Then, it was washed with water by a flocculation method according to a conventional method. Specifically, the temperature was lowered to 35 ° C., and the pH was lowered using sulfuric acid until the silver halide precipitated (the pH was in the range of 3.6 ± 0.2). Next, about 3 liters of the supernatant was removed (first water washing). Further, 3 liters of distilled water was added, and sulfuric acid was added until the silver halide settled. Again, 3 liters of the supernatant was removed (second water wash). The same operation as the second water washing was further repeated once (third water washing) to complete the water washing / desalting step. The emulsion after washing with water and desalting was adjusted to pH 6.4 and pAg 7.5, and gelatin 3.9 g, sodium benzenethiosulfonate 10 mg, sodium benzenethiosulfinate 3 mg, sodium thiosulfate 15 mg and chloroauric acid 10 mg were added. Chemical sensitization to obtain optimum sensitivity at 0 ° C., 100 mg of 1,3,3a, 7-tetraazaindene as stabilizer and 100 mg of proxel (trade name, manufactured by ICI Co., Ltd.) as preservative It was. The finally obtained emulsion contains 0.08 mol% of silver iodide, and the ratio of silver chlorobromide is 70 mol% of silver chloride and 30 mol% of silver bromide. It was a silver iodochlorobromide cubic grain emulsion having a coefficient of 9%.

(Preparation of photosensitive layer forming composition)
1,3,3a, 7-tetraazaindene 1.2 × 10 ⁻⁴ mol / mol Ag, hydroquinone 1.2 × 10 ⁻² mol / mol Ag, citric acid 3.0 × 10 ⁻⁴ mol / Mol Ag, 2,4-dichloro-6-hydroxy-1,3,5-triazine sodium salt 0.90 g / mol Ag, a trace amount of hardener was added, and the coating solution pH was adjusted to 5. with citric acid. Adjusted to 6.
Polymer latex containing a dispersant represented by (P-1) and a dialkylphenyl PEO sulfate ester (dispersant / polymer mass ratio is 2.0) with respect to gelatin contained in the coating solution. /100=0.02) and polymer / gelatin (mass ratio) = 0.5 / 1.

Furthermore, EPOXY RESIN DY 022 (trade name: manufactured by Nagase ChemteX Corporation) was added as a crosslinking agent. In addition, the addition amount of the crosslinking agent was adjusted so that the amount of the crosslinking agent in the photosensitive layer described later would be 0.09 g / m ² .
A photosensitive layer forming composition was prepared as described above.
The polymer represented by the above (P-1) was synthesized with reference to Japanese Patent No. 3305459 and Japanese Patent No. 3754745.

(Photosensitive layer forming step)
A PET (polyethylene terephthalate) film having a thickness of 40 μm was prepared as a substrate. The above-mentioned polymer latex was applied to both sides of the substrate to provide an undercoat layer having a thickness of 0.05 μm.
Next, an antihalation layer comprising a mixture of the above-described polymer latex and gelatin and a dye having an optical density of about 1.0 and decolorizing with an alkali of a developer was provided on the undercoat layer. The mixing mass ratio of polymer to gelatin (polymer / gelatin) was 2/1, and the polymer content was 0.65 g / m ² .
On the above-mentioned antihalation layer, the above-mentioned photosensitive layer-forming composition is applied, and the above-mentioned polymer latex, gelatin and Epocross K-2020E (trade name: manufactured by Nippon Shokubai Co., Ltd., oxazoline-based cross-linking reactive polymer) Latex (crosslinkable group: oxazoline group)) and Snowtex C (registered trademark, manufactured by Nissan Chemical Industries, Ltd., colloidal silica) and a solid content mass ratio (polymer / gelatin / Epocross K-2020E / Snowtex C) (Registered trademark)) A composition mixed at 1/1 / 0.3 / 2 was applied so that the amount of gelatin was 0.08 g / m ^2, and a support substrate having a photosensitive layer formed on both sides was obtained. . A supporting substrate having a photosensitive layer formed on both sides is referred to as a film A. The formed photosensitive layer had a silver amount of 6.2 g / m ² and a gelatin amount of 1.0 g / m ² .

(Exposure development process)
As exposure masks for forming the fine metal wires 50, exposure masks having a mesh pattern as shown in FIG. 12 were prepared. The exposure mask of the mesh pattern was arrange | positioned on both surfaces of the above-mentioned film A, and exposure was repeatedly performed by the predetermined pattern space | interval using the parallel light which used the high pressure mercury lamp as the light source. As the mesh pattern, one in which the length of one side of the lattice was set to 150 μm and the line width was set to 4 μm was used.
After the exposure, development was performed with the following developer, and further development was performed using a fixer (trade name: N3X-R for CN16X, manufactured by Fuji Film Co., Ltd.). Further, the substrate was rinsed with pure water and dried to obtain a support substrate having a pattern portion made of silver fine wires and a gelatin layer formed on both sides. The gelatin layer was formed between the silver thin wires. The resulting film is referred to as film B.

(Developer composition)
The following compounds are contained in 1 liter (L) of the developer.
Hydroquinone: 0.037 mol / L
N-methylaminophenol: 0.016 mol / L
Sodium metaborate ... 0.140 mol / L
Sodium hydroxide: 0.360 mol / L
Sodium bromide: 0.031 mol / L
Potassium metabisulfite ... 0.187 mol / L

(Gelatin decomposition treatment)
The film B was immersed in an aqueous solution (proteolytic enzyme concentration: 0.5 mass%, liquid temperature: 40 ° C.) of a proteolytic enzyme (Biosease AL-15FG manufactured by Nagase ChemteX Corporation) for 120 seconds. . The film B was taken out from the aqueous solution, immersed in warm water (liquid temperature: 50 ° C.) for 120 seconds, and washed. The film after gelatin degradation is designated as film C.

(Low resistance treatment)
The above-mentioned film C was calendered at a pressure of 30 kN using a calender device composed of a metal roller. At this time, PET having a rough surface shape of line roughness Ra = 0.2 μm, Sm = 1.9 μm (measured with a shape analysis laser microscope VK-X110 manufactured by Keyence Corporation (JIS-B-0601-1994)) Polyethylene terephthalate) films were conveyed together so that their rough surfaces face the front and back surfaces of the above-mentioned film C, and the rough surface shape was transferred and formed on the front and back surfaces of the above-mentioned film C.
After the above-described calendar treatment, a heat treatment was performed by passing through a superheated steam tank having a temperature of 150 ° C. over 120 seconds. The film after the heat treatment is a transparent conductive film.

<< Flexible device >>
The flexible device includes a composite member, an adhesive film (MO-3015G (product name) manufactured by Lintec Corporation), a λ / 4 layer, a polarizer layer, and an adhesive film (MO-3015G (product name) manufactured by Lintec Corporation). Transparent conductive film, adhesive film (MO-3015C (product name) manufactured by Lintec Corporation), polyimide film (film thickness 30 μm), adhesive film (MO-3015C (product name) manufactured by Lintec Corporation), and polyimide film ( The layers were laminated in the order of 125 μm).

Hereinafter, Examples 1 to 6 and Comparative Examples 1 to 3 will be described.
Example 1
In Example 1, the following composite member was used for the flexible device having the above-described configuration. The composite member has a structure in which four layers of a laminated structure composed of a cover material and an adhesive layer are laminated, and a PET film having a thickness of 10 μm is provided in the lowermost layer. The total thickness of the composite member was 150 μm.
A PET (polyethylene terephthalate) film having a thickness of 10 μm was used as a cover material for the composite member. The elastic modulus of the cover material was 4.1 Pa. For the adhesive layer, MO-3015C (product name) manufactured by Lintec Corporation was used.
Moreover, the adhesive force between the cover material and the adhesive layer is 0.41 (N / mm). The adhesion between the cover material and the adhesive layer is a value measured by a 180 degree peel test.
In Table 1 below, the numerical value in parentheses indicates the film thickness, and “OCA” indicates the adhesive layer. In Table 1 below, “-” indicates that there is no member.

(Example 2)
Example 2 is different from Example 1 in that the composite member is formed by laminating two layers of a laminate composed of a cover material and an adhesive layer, and a PET film having a film thickness of 17 μm is provided in the lowermost layer. . In Example 2, the total thickness of the composite member was 151 μm, and a PET film having a thickness of 17 μm was used as the cover material. MO-3015G (product name) manufactured by Lintec Corporation was used for the adhesive layer.
Moreover, the adhesive force between the cover material and the adhesive layer is 0.58 (N / mm). The rest is the same as in Example 1.

(Example 3)
Compared to Example 1, Example 3 uses “8146-2” (trade name) manufactured by 3M for the adhesive layer, and the adhesion between the cover material and the adhesive layer is 0.27 (N / Mm) The same as Example 1, except that it is different.
Example 4
Compared with Example 2, Example 4 uses “8146-2” (trade name) manufactured by 3M for the adhesive layer, and the adhesion between the cover material and the adhesive layer is 0.3 (N / Mm) The same as Example 2 except for the difference.

(Example 5)
Example 5 is different from Example 1 in that a transparent PI (polyimide) film having a film thickness of 10 μm is used as the cover material, a transparent PI film having a film thickness of 10 μm is provided in the lowermost layer, and the elasticity of the cover material. Example 1 is the same as Example 1 except that the rate is 5.5 Pa and that the adhesion between the cover material and the adhesive layer is 0.63 (N / mm).
(Example 6)
Example 6 is different from Example 1 in that a TAC (triacetylcellulose) film having a film thickness of 10 μm is used as the cover material, a transparent PI film having a film thickness of 10 μm is provided in the lowermost layer, Example 1 is the same as Example 1 except that the elastic modulus is 3.2 Pa and that the adhesion between the cover material and the adhesive layer is 0.38 (N / mm).

(Comparative Example 1)
Compared to Example 1, Comparative Example 1 is a composite material in which a laminated structure composed of a cover material and an adhesive layer is one layer, and a PET film having a film thickness of 25 μm is provided in the lowermost layer. A point using a 25 μm thick PET film, a point using MO-3015H (product name) manufactured by Lintec Co., Ltd. for the adhesive layer, and an adhesive force between the cover material and the adhesive layer of 0.68 (N / mm) Except for some differences, this embodiment is the same as the first embodiment. In Comparative Example 1, the thickness of the adhesive layer is 100 μm. (Comparative Example 2)
In Comparative Example 2, compared to Example 1, the composite member has a single layered structure composed of a cover material and an adhesive layer, and a point in which a 50 μm-thick PET film is used for the cover material, Same as Example 1 except that MO-3015H (product name) manufactured by Lintec Co., Ltd. was used for the adhesive layer and that the adhesion between the cover material and the adhesive layer was 0.68 (N / mm). It is. In Comparative Example 1, the thickness of the adhesive layer is 100 μm.
(Comparative Example 3)
In Comparative Example 3, compared to Example 1, the composite member is one layered structure composed of a cover material and an adhesive layer, and a transparent PI film having a film thickness of 25 μm is provided in the lowermost layer. In addition, a transparent PI film with a film thickness of 25 μm is used for the cover material, an MO-3015H (product name) manufactured by Lintec Corporation is used for the adhesive layer, and the adhesion between the cover material and the adhesive layer is 0.9 (N / Mm) The same as Example 1, except that it is different. In Comparative Example 1, the thickness of the adhesive layer is 100 μm.

As shown in Table 1, the bending test results of Examples 1 to 6 were superior to those of Comparative Examples 1 to 3. In Examples 1 to 6, the same results as Comparative Examples 1 to 3 were obtained in the impact deformation test. Thereby, the composite member of this invention can be utilized as a protective layer.

DESCRIPTION OF SYMBOLS 10 Member 10a, 11a, 100a, 101a, Ds Stress 11 Member 12 Laminated body 20, 21 Display apparatus 22 Display part 23, 25, 27 Transparent layer 24 Touch sensor part 26 Antireflection layer 28 Protective layer 28a Surface 29 Controller 30 Lamination | stacking structure Body 32 Cover material 33 Adhesive layer 36 Touch panel 40, 41 Substrate 40a, 41a Front surface 40b Back surface 42 First detection section 43 First peripheral wiring 44 Second detection section 45 Second peripheral wiring 47 Detection area 50 Metal fine line 52 Adhesive layer 54 Transparent layer 60, 62, 64 Display device 60a Central part 60b, 62a First side part 60c, 62b Second side part 60d, 62c, 64a Display area 60e, 62d End part 65 Core 100 Member 101 Member 102 Lamination Body X Second direction Y First direction t Thickness w Line width

Claims (8)

1. At least two laminated structures are laminated,
   The laminated structure is composed of one cover material and one adhesive layer.
2. The composite member according to claim 1, wherein the cover material has a film thickness of 50 μm or less.
3. The composite member according to claim 1, wherein the adhesive layer has a thickness of 25 μm or less.
4. The composite member according to claim 3, wherein the adhesive layer has a thickness of 20 μm or less.
5. The composite member according to any one of claims 1 to 4, wherein the laminate structure is a laminate of five or more layers.
6. The composite member according to any one of claims 1 to 5, wherein the cover material is composed of at least one of polyimide, polyamide, cycloolefin polymer, polyethylene terephthalate, triacetylcellulose, and cycloolefin copolymer.
7. The composite member according to any one of claims 1 to 6, which is used for a protective layer of a touch panel.
8. A touch panel comprising the composite member according to any one of claims 1 to 7.

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