JPWO2014065000A1 - Display device with touch panel - Google Patents

Abstract

A display device with a touch panel is formed by bonding a touch panel (20) and a display device (10) through an adhesive layer (30). The polarizing plate (2) of the display device (10) includes a polarizer (3) and a protective film (film substrate (4a)) for protecting the surface of the polarizer (3). The touch panel (20) includes a scattering prevention film (25) for preventing scattering of the glass substrate (21) and an electromagnetic wave shielding layer (26) for blocking electrical noise from the display device (10). ing. The protective film is a cellulose ester film having a thickness of 20 to 30 μm. The scattering prevention film (25) is a cellulose ester film having a thickness of 20 to 66 μm.

Description

  The present invention relates to a display measure with a touch panel in which a touch panel and a display device are bonded together via an adhesive layer.

  In recent years, as various electronic devices such as a mobile phone, a portable terminal, and a personal computer have become highly functional and diversified, a touch panel is used as one of input means to these electronic devices. The touch panel has optical transparency, and when it is bonded to a liquid crystal display device, for example, it is attached to the polarizing plate side of the liquid crystal panel via an adhesive.

  Conventionally, a touch panel mounted on the surface of an information display unit of a mobile terminal is light-transmitting from the viewpoint of making the information displayed on the information display unit easy to see and not breaking even if the mobile terminal is dropped. A high-quality plastic plate was used. However, if the plastic plate is made thin in order to pursue the reduction in thickness and weight required for the portable terminal, the strength of the plastic plate is insufficient. In order to solve this problem, in recent years, a glass substrate having higher strength than a plastic plate has been used for a touch panel mounted on the surface of an information display unit.

  However, when a glass substrate is used, the glass substrate may be damaged when the portable terminal is dropped, and the fragments may be scattered. For this reason, it has been conventionally studied to use a glass scattering prevention film by bonding it to the surface of a glass substrate. Generally, a polyethylene terephthalate (PET) film that is inexpensive and has an anti-scattering effect is used as a glass anti-scattering film. Since the PET film generally has low adhesion to the pressure-sensitive adhesive layer, in order to improve the adhesion, a PET film with an easy adhesion layer provided with a thin film called an easy adhesion layer is used.

  However, the PET film may generate interference fringes due to the refractive index relationship, thereby reducing the visibility of display information. In order to improve this, a triacetyl cellulose film with an adhesive layer is used instead of a PET film, and it is studied to prevent scattering of the glass substrate by bonding to the outermost surface of the glass substrate as a protective film. (For example, refer to Patent Document 1).

  On the other hand, there are various types of touch panels, and one of them is a capacitive touch panel. In this capacitive touch panel, an X electrode pattern formed on a transparent substrate so as to extend in the X direction by a transparent conductive film, and Y formed so as to extend in the Y direction by another transparent conductive film. An electrode pattern is provided. Examples of the X electrode pattern and the Y electrode pattern include a rectangular pattern and a diamond pattern, which are formed using ITO (Indium Tin Oxide). When the surface of the substrate of the touch panel is pressed with a finger, the X electrode pattern and the Y electrode pattern come into contact with each other, and the capacitance at that position changes. It is possible to specify the pressed position by detecting via the.

  In a capacitive touch panel having such a two-layer transparent conductive film and a touch surface made of glass, a transparent optical double-sided tape (OCA; Optical) is applied to the two-layer transparent conductive film. If another glass substrate is bonded together via Clear Adhesive tape) or a filler, the touch panel becomes thicker. In this regard, the electrostatic capacitance type touch panel of Patent Document 2 includes a two-layer transparent conductive film extending in directions orthogonal to each other and the touch surface is a glass substrate. By using only one glass substrate, the entire touch panel is reduced in thickness.

  However, when a thin touch panel using only one glass substrate as in Patent Document 2 is attached to, for example, a liquid crystal display device as a display device via an adhesive layer, an electrode layer (X electrode pattern, The position of the (Y electrode pattern) approaches the liquid crystal panel. For this reason, when each pixel of the liquid crystal panel is driven, it is easily affected by electrical noise (including leakage current) generated by ON / OFF of a switching element (for example, TFT) provided corresponding to each pixel. Is likely to malfunction (for example, the pressed position cannot be detected accurately due to the noise).

  In addition, when the glass substrate is positioned on the outermost layer of the touch panel (the layer on the side opposite to the display device), water in the display device (for example, water contained in the polarizer itself or by applying a protective film to the polarizer in an aqueous system) Since the generated water) cannot pass through the glass substrate, it becomes more likely to be confined to the display device side than the glass substrate, and the adhesiveness of the pressure-sensitive adhesive layer is lowered by this water and the pressure-sensitive adhesive layer is easily peeled off.

JP 2011-209512 A (refer to claim 1, paragraph [0012], FIG. 1, etc.) JP 2011-186717 A (refer to claim 1, paragraphs [0016] and 0022], FIG. 1 and the like)

  In view of the above circumstances, the object of the present invention is to cause a malfunction of the touch panel due to electrical noise from the display device even when the thin touch panel, which uses only one glass substrate, is bonded to the display device. It is difficult to provide a display device with a touch panel that is difficult and can prevent peeling of an adhesive layer.

  The above object of the present invention is achieved by the following configurations.

1. A display device with a touch panel in which the electrode layer side of a touch panel having an electrode layer on a glass substrate and the polarizing plate side of a display device having a polarizing plate on a display panel are bonded via an adhesive layer. ,
The polarizing plate includes a polarizer and a protective film for protecting the surface of the polarizer on the touch panel side,
The touch panel includes, on the electrode layer, a scattering prevention film for preventing scattering of the glass substrate, and an electromagnetic wave shielding layer for blocking electrical noise from the display device,
The protective film is a cellulose ester film having a thickness of 20 to 30 μm,
The display device with a touch panel, wherein the scattering prevention film is a cellulose ester film having a thickness of 20 to 66 μm.

  2. 2. The display device with a touch panel as described in 1 above, wherein the scattering prevention film has a retardation Ro in the in-plane direction of 0 nm to 10 nm.

  3. The scattering prevention film has a retardation Ro in the in-plane direction of 30 nm to 200 nm, and is arranged so that the slow axis of the scattering prevention film is in the direction of 10 to 80 ° with respect to the transmission axis of the polarizer. 2. The display device with a touch panel as described in 1 above.

  4). 4. The display device with a touch panel according to any one of 1 to 3, wherein the polarizing plate has a hard coat layer on the protective film.

  5. 5. The display device with a touch panel according to any one of 1 to 4, wherein the electromagnetic wave shielding layer is composed of silver nanowires.

  6). 5. The display device with a touch panel according to any one of 1 to 4, wherein the electromagnetic wave shielding layer is composed of carbon nanotubes.

  7). 5. The display device with a touch panel according to any one of 1 to 4, wherein the electromagnetic shielding layer is made of a conductive polymer.

8). The polarizing plate, on the side opposite to the touch panel with respect to the polarizer, any of the 1, characterized in that moisture permeability has the following optical film 200g / m ² / 24h 7 of The display device with a touch panel as described.

  According to said structure, the electromagnetic wave shield layer is provided on the scattering prevention film of a touch panel, and the electrical noise (for example, the electrical noise by ON / OFF of the switching element of a display panel) from a display apparatus is an electromagnetic wave shield layer. It is interrupted by. Thereby, even if it is the structure which bonded the thin touch panel with which only one glass substrate is used to a display apparatus, the malfunction of the touch panel by the said electrical noise can be made hard to raise | generate.

  The protective film on the touch panel side of the polarizing plate is a cellulose ester film (hereinafter also referred to as film A1), and the scattering prevention film of the touch panel is also a cellulose ester film (hereinafter also referred to as film A2). Since the cellulose ester film has high hygroscopicity and moisture permeability, even if the film A1 is made thin with a thickness of 20 to 35 μm, and the film A2 is made thin with a thickness of 20 to 66 μm, the moisture inside the display device with a touch panel is removed from the film A1. It can be trapped (captured) by both the film A2 and the water can be prevented from accumulating between the electromagnetic wave shielding layer and the pressure-sensitive adhesive layer. Thereby, the adhesiveness of an adhesive layer falls with the said water | moisture content, and it can suppress that an adhesive layer peels. Moreover, by making the film A1 and the film A2 thin as described above, it is possible to sufficiently contribute to the thinning of the entire display device with a touch panel.

It is sectional drawing which shows the schematic structure of the display apparatus with a touchscreen which concerns on embodiment of this invention.

  An embodiment of the present invention will be described below with reference to the drawings. In the present specification, when the numerical range is expressed as A to B, the numerical value range includes the values of the lower limit A and the upper limit B.

[Display device with touch panel]
FIG. 1 is a cross-sectional view illustrating a schematic configuration of a display device with a touch panel according to the present embodiment. As shown in the figure, the display device with a touch panel is configured by bonding the display device 10 and the touch panel 20 through an adhesive layer 30.

  The display device 10 is configured by laminating a polarizing plate 2 on a display panel 1. The display panel 1 can be constituted by a liquid crystal display panel (LCD) or an organic EL (Organic light-Emitting Diode) display. LCDs and OLEDs have a plurality of pixels arranged in a matrix, and display is performed by turning on / off the driving of each pixel by a switching element such as a TFT (Thin Film Transistor).

  The polarizing plate 2 includes a polarizer 3 that transmits predetermined linearly polarized light, a film 4 that is laminated on the touch panel 20 side of the polarizer 3, and a film 5 that is laminated on the display panel 1 side of the polarizer 3. ing. The polarizer 3 is obtained by, for example, dyeing a polyvinyl alcohol film with a dichroic dye and stretching the film at a high magnification. After being subjected to an alkali treatment (also referred to as a saponification treatment), the above-described films 4 and 5 are converted into the polarizer 3. Each surface is bonded with an aqueous polyvinyl alcohol solution as an adhesive (water-based bonding).

  The film 4 is configured as a hard coat film in which a hard coat layer 4b is laminated on a film substrate 4a (protective film), and has a function of protecting the surface of the polarizing plate 2 (polarizer 3). . Although the film base material 4a can be comprised with various materials, in this embodiment, it is comprised with the cellulose ester film of thickness 20-30 micrometers among them. The hard coat layer 4b is made of, for example, an active energy ray curable resin and has a thickness of several μm. Although the film 4 may be configured as a protective film by itself (without laminating a hard coat layer) alone, the film 4 may be a hard coat film in which a hard coat layer 4b is formed on the film substrate 4a. The function of protecting the surface of the polarizing plate 2 can be enhanced. In particular, in the present embodiment, since the film base 4a and the scattering prevention film 25 are thin films, the display panel 1 is easily damaged when the touch panel 20 is pressed, but the film 4 is a hard coat film. The occurrence of such damage can be suppressed.

  When the display panel 1 is an LCD, another polarizing plate (not shown) is disposed on the opposite side of the display panel 1 from the polarizing plate 2. When the display panel 1 is an OLED display, the polarizing plate 2 is preferably configured as a circularly polarizing plate (or an elliptically polarizing plate) for preventing external light reflection. In the case of a circularly polarizing plate, the film 5 on the display panel 1 side of the polarizer 3 is an optical film that imparts an in-plane retardation of about ¼ of the wavelength to the transmitted light. It is preferable that the polarizer 3 and the film 5 are bonded together so that the axis and the slow axis of the film 5 intersect at an angle of about 45 °.

When the display panel 1 is an LCD, the film 5 may be simply provided as a protective film for a polarizer, or may be a protective film that also serves as a retardation film having a desired optical compensation function. As described above, when the display panel 1 is an OLED display, the film 5 is preferably an optical film that imparts an in-plane retardation of about ¼ of the transmission wavelength. The film 5 is preferred that the moisture permeability is a film or less 200g / m ² / 24h, specifically, constituted by an optical film made of acrylic resin, cyclic polyolefin (COP), polycarbonate (PC) or the like It is desirable to do. This optical film moisture permeability exceeding 200g / m ² / 24h, since provided in the display panel 1 side of the polarizer 3, when the phase difference of the optical film is varied by, for example, water produced by the water-based adhesive, This is because the polarization state of the light from the display panel 1 is changed by the optical film, and the amount of light may decrease when passing through the polarizer 3. On the other hand, the scattering prevention film 25 and the film 4 provided outside the polarizer 3 do not affect the polarization state even if the phase difference fluctuates due to moisture. Therefore, a cellulose ester film having high water permeability and water absorption is used. It can be preferably used. By the way, the moisture permeability of acrylic 100g / m ² / 24h. A 40 [mu] m, the moisture permeability of the COP 0.1g / m ² / 24h. Is 40μm, moisture permeability of the PC is 100g / m ² / 24h. It is about 40 μm. In the present invention, moisture permeability refers to that measured under test conditions of 40 ° C. and 90% RH.

  The touch panel 20 is a capacitive touch panel, and has a first electrode pattern 22 (electrode layer) made of a transparent conductive film (for example, ITO), an interlayer insulating layer 23, and a transparent conductive film (for example, on a glass substrate 21). The second electrode pattern 24 (electrode layer) made of ITO), the anti-scattering film 25, and the electromagnetic wave shielding layer 26 are laminated in this order. That is, in the touch panel 20, the glass substrate used is only one glass substrate 21, and the thin touch panel 20 is configured as compared with the one using two glass substrates. An insulating film may be provided between the second electrode pattern 24 and the scattering prevention film 25 so as to cover the second electrode pattern 24.

  The surface of the glass substrate 21 (surface opposite to the first electrode pattern 22) is a touch surface of the touch panel 20. The first electrode pattern 22 is formed on the glass substrate 21 so as to extend in one direction (for example, the X direction). The interlayer insulating layer 23 is formed on the glass substrate 21 so as to cover the first electrode pattern 22. The second electrode pattern 24 is formed so as to extend in a direction orthogonal to the direction in which the first electrode pattern 22 extends (for example, the Y direction). When the surface of the touch panel 20 is pressed with a finger, the first electrode pattern 22 and the second electrode pattern 24 come into contact with each other, and the capacitance between the first electrode pattern 22 and the second electrode pattern 24 changes. By detecting the change in capacitance through the first electrode pattern 22 and the second electrode pattern 24, the pressing position (coordinates) can be specified.

  The scattering prevention film 25 is provided on the electrode layer (second electrode pattern 24) in order to prevent the glass substrate 21 from scattering due to an external impact or the like. In this embodiment, the scattering prevention film 25 is comprised with the cellulose ester film of thickness 20-66 micrometers. As such a cellulose ester film, a film having a retardation Ro in the in-plane direction of 0 nm to 10 nm can be preferably used. In this case, since there is little interference due to the phase difference in the in-plane direction, it is possible to improve the visibility when viewing the display panel 10 with the naked eye via the touch panel 20.

  Further, as the cellulose ester film of the scattering prevention film 25, a film having a retardation Ro in the in-plane direction of 30 nm to 200 nm is used, and the slow axis of the scattering prevention film is 10 to 80 with respect to the transmission axis of the polarizer 3. It is preferable that they are arranged in the direction of ° (preferably 20 to 80 °). With such a configuration, the linearly polarized light transmitted through the polarizer 3 can be changed to elliptically polarized light or circularly polarized light, so that the visibility when viewing the display device 10 with polarized sunglasses can be improved. .

  As will be described in detail later, the electromagnetic wave shielding layer 26 is a layer containing a conductive substance provided to block electrical noise (including EMI (electromagnetic interference)) from the display device 10. A wire (AgNW), a carbon nanotube (CNT), and a conductive polymer are contained.

  The pressure-sensitive adhesive layer 30 is composed of an adhesive layer such as OCA or UV curable resin (OCR), and is formed on the entire surface of the polarizing plate 2 of the display device 10 to join the touch panel 20 and the display device 10 together. Yes.

  In the above configuration, since the electromagnetic wave shielding layer 26 is provided on the scattering prevention film 25 of the touch panel 20, electrical noise (including leakage current) generated by ON / OFF of the switching element (TFT) of the display panel 1. Can be blocked by the electromagnetic wave shielding layer 26. Thereby, even if it is the structure which bonded the thin touch panel 20 which used only one glass substrate to the display apparatus 10, the 1st electrode pattern 22 and the 2nd electrode pattern 24 are displayed by thinning of the touch panel 20, ie. Even if it approaches the device 10 and is easily affected by the electrical noise from the display device 10, it is possible to make it difficult for the touch panel 20 to malfunction due to the electrical noise.

  In addition, when the outermost layer (the layer opposite to the display device 10) of the touch panel 20 is the glass substrate 21, the glass substrate 21 cannot transmit moisture, and thus occurs due to aqueous adhesion at the time of manufacturing the polarizing plate 2. Moisture is trapped between the glass substrate 21 and the display panel 1, and is likely to accumulate between the electromagnetic wave shielding layer 26 and the pressure-sensitive adhesive layer 30, for example.

However, the film 4 as a protective film of the polarizing plate 2 includes a cellulose ester film (film substrate 4a), and the scattering prevention film 25 of the touch panel 20 also includes a cellulose ester film. The moisture permeability of the cellulose ester is, for example, 700~2000g / m ² / 24hr, compared to other resins such as acrylic, its hygroscopicity and moisture permeability is high. For this reason, even if the film base 4a made of a cellulose ester film is made thin with a thickness of 20 to 35 μm and the anti-scattering film 25 made of a cellulose ester film is made thin with a thickness of 20 to 66 μm, the inside of the display device with a touch panel is used. The generated moisture can be trapped (captured) by both the film 4 and the scattering prevention film 25, and the moisture can be prevented from being accumulated between the electromagnetic wave shielding layer 26 and the pressure-sensitive adhesive layer 30. Thereby, it can suppress that the adhesiveness of the adhesive layer 30 falls by said water | moisture content, and the adhesive layer 30 peels. Further, it is possible to suppress the polarizer 3 from being deteriorated by the moisture, and it is possible to suppress a reddish display even when displaying black.

  Moreover, since the film base material 4a which consists of a cellulose-ester film, and the scattering prevention film 25 which consists of a cellulose-ester film are thin as mentioned above, it can fully contribute to thickness reduction of the whole display apparatus with a touch panel.

  Moreover, since the film thickness of the cellulose-ester film of the film base material 4a is 20 micrometers or more, the surface protection function of the polarizer 3 by the film 4 can be ensured reliably. Similarly, since the film thickness of the cellulose ester film of the scattering prevention film 25 is 20 μm or more, the function of preventing the scattering of the glass substrate 21 by the scattering prevention film 25 can be reliably ensured.

[About polarizing plate]
Hereinafter, the detail of each layer which comprises the above-mentioned polarizing plate 2 is demonstrated. Note that the protective film and hard coat layer described below can also be applied to the anti-scattering film 25 of the touch panel 20.

[Protective film]
The film substrate 4a which is a protective film on the touch panel 20 side of the polarizing plate 2 is composed of a cellulose ester film having a thickness of 20 to 30 μm. The cellulose ester resin used will be described in detail later.

The film 5 is a protective film of the display panel 1 side of the polarizing plate 2 is not particularly limited and may be a thermoplastic resin or a thermosetting resin, moisture permeability is less than 200 g / m ² / 24h Film Specifically, it is desirable to use an optical film made of acrylic resin, cyclic polyolefin (COP), polycarbonate (PC), or the like.

(Thermoplastic resin)
The thermoplastic resin that can be used for the film 5 refers to a resin that becomes soft when heated to a glass transition temperature or a melting point and can be molded into a desired shape.

  General thermoplastic resins include cellulose esters, polyethylene (PE), high density polyethylene, medium density polyethylene, low density polyethylene, polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene chloride, polystyrene. (PS), polyvinyl acetate (PVAc), Teflon (registered trademark) (polytetrafluoroethylene, PTFE), ABS resin (acrylonitrile butadiene styrene resin), AS resin, acrylic resin (PMMA), or the like can be used.

  Especially when strength and resistance to breakage are required, polyamide (PA), nylon, polyacetal (POM), polycarbonate (PC), modified polyphenylene ether (m-PPE, modified PPE, PPO), polybutylene terephthalate (PBT) Polyethylene terephthalate (PET), glass fiber reinforced polyethylene terephthalate (GF-PET), cyclic polyolefin (COP), and the like can be used.

  Furthermore, when high heat distortion temperature and long-term use characteristics are required, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polysulfone, polyethersulfone, amorphous polyarylate, liquid crystal polymer, polyether Ether ketone, thermoplastic polyimide (PI), polyamideimide (PAI), or the like can be used.

  In this embodiment, it is preferable to use a polycarbonate resin, a polyethylene terephthalate resin, an acrylic resin, or a polyolefin resin as the film 5 from the viewpoint of manifesting the effects of this embodiment.

  The thickness of the film 5 is more preferably 20 to 66 μm from the viewpoint of manifesting the effect of the present embodiment and the viewpoint of thinning.

  Hereinafter, in this embodiment, the cellulose ester resin used suitably for the film base material 4a is demonstrated in detail.

<Cellulose ester resin>
The cellulose ester resin that can be used for the film 4a in this embodiment is cellulose (di, tri) acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose. It is preferably at least one selected from phthalates.

  Among these, particularly preferable cellulose esters include cellulose triacetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, and cellulose acetate butyrate.

As the substitution degree of the mixed fatty acid ester, more preferable cellulose acetate propionate and lower fatty acid ester of cellulose acetate butyrate have an acyl group having 2 to 4 carbon atoms as a substituent, and the substitution degree of an acetyl group is X. When the substitution degree of propionyl group or butyryl group is Y, it is preferably a cellulose resin containing a cellulose ester that simultaneously satisfies the following formulas (I) and (II).
Formula (I) 2.6 ≦ X + Y ≦ 3.0
Formula (II) 1.0 ≦ X ≦ 2.5

  Of these, cellulose acetate propionate is particularly preferably used. Among them, 1.9 ≦ X ≦ 2.5 and 0.1 ≦ Y ≦ 0.9 are preferable. The part not substituted with the acyl group is usually present as a hydroxyl group. These can be synthesized by known methods.

  Furthermore, the cellulose ester used in the present embodiment is preferably one having a weight average molecular weight Mw / number average molecular weight Mn ratio of 1.5 to 5.5, particularly preferably 2.0 to 5.0, More preferably, it is 2.5-5.0, More preferably, 3.0-5.0 cellulose ester is used preferably.

  The raw material cellulose of the cellulose ester used in this embodiment may be wood pulp or cotton linter. The wood pulp may be coniferous or hardwood, but coniferous is more preferred. A cotton linter is preferably used from the viewpoint of releasability during film formation. The cellulose ester made from these can be mixed suitably or can be used independently.

  For example, the ratio of cellulose ester derived from cellulose linter: cellulose ester derived from wood pulp (coniferous): cellulose ester derived from wood pulp (hardwood) is 100: 0: 0, 90: 10: 0, 85: 15: 0, 50:50: 0, 20: 80: 0, 10: 90: 0, 0: 100: 0, 0: 0: 100, 80:10:10, 85: 0: 15, 40:30:30 can be used. .

  In this embodiment, 1 g of cellulose ester resin is added to 20 ml of pure water (electric conductivity of 0.1 μS / cm or less, pH 6.8), and the pH when stirred in a nitrogen atmosphere at 25 ° C. for 1 hr. It is preferable that it is 6-7 and electrical conductivity is 1-100 microsiemens / cm.

[Film production method]
As a method for producing a film substrate, production methods such as a normal inflation method, a T-die method, a calendar method, a cutting method, a casting method, an emulsion method, and a hot press method can be used. A casting method such as a melt casting film forming method is preferably used. Hereinafter, the preferable manufacturing method of a film base material is demonstrated.

<Manufacturing method of base material by solution casting film forming method>
1) Dissolution Step The dissolution step is a step in which a dope is formed by dissolving a thermoplastic resin, a heat-shrinkable material, and other additives in an organic solvent mainly composed of a good solvent for the thermoplastic resin while stirring. is there. A good solvent refers to an organic solvent having good solubility in a thermoplastic resin in an optical film manufacturing method by a solution casting film forming method, and also shows a main effect on dissolution, among which a large amount The organic solvent used in the above is called a main (organic) solvent or a main (organic) solvent.

  For the dissolution of the thermoplastic resin, a method carried out at normal pressure, a method carried out below the boiling point of the main solvent, a method carried out under pressure above the boiling point of the main solvent, JP-A-9-95544, JP-A-9-95557 Alternatively, various dissolution methods such as a cooling dissolution method as described in JP-A-9-95538 and a high-pressure method as described in JP-A-11-21379 can be used. The method of pressurizing at a boiling point or higher is preferred.

  Return materials are also reused. The return material refers to a material obtained by finely pulverizing a film, which is generated when a film is formed, a material obtained by cutting off both sides of the film, or a film raw material that has been speculated out due to scratches or the like.

2) Casting process In the casting process, the dope is fed to a pressure die through a liquid feed pump (for example, a pressurized metering gear pump), and transferred to an endless metal belt such as a stainless steel belt or a rotating metal. This is a step of casting a dope from a pressure die slit to a casting position on a metal support such as a drum.

  A pressure die that can adjust the slit shape of the die base portion and can easily make the film thickness uniform is preferable. Examples of the pressure die include a coat hanger die and a T die, and any of them is preferably used. The surface of the metal support is a mirror surface. In order to increase the film forming speed, two or more pressure dies may be provided on the metal support, and the dope amount may be divided and stacked. Or it is also preferable to obtain the film of a laminated structure by the co-casting method which casts several dope simultaneously.

3) Solvent evaporation process The solvent evaporation process is a process in which a web (a dope film formed by casting a dope on a casting support) is heated on the casting support to evaporate the solvent.

  To evaporate the solvent, there are a method of blowing air from the web side and / or a method of transferring heat from the back side of the support by a liquid, a method of transferring heat from the front and back by radiant heat, and the like. High efficiency and preferable. A method of combining them is also preferably used. The web on the support after casting is preferably dried on the support in an atmosphere of 40 to 100 ° C. In order to maintain the atmosphere at 40 to 100 ° C., it is preferable to apply hot air at this temperature to the upper surface of the web or to heat by means such as infrared rays.

  From the viewpoint of surface quality, moisture permeability, and peelability, it is preferable to peel the web from the support within 30 to 120 seconds.

4) Peeling process A peeling process is a process of peeling the web which the solvent evaporated on the metal support body in a peeling position. The peeled web is sent to the next process.

  The temperature at the peeling position on the metal support is preferably 10 to 40 ° C, more preferably 11 to 30 ° C.

  In addition, it is preferable that the residual solvent amount at the time of peeling of the web on the metal support at the time of peeling is peeled in the range of 50 to 120% by mass depending on the strength of drying conditions, the length of the metal support, and the like. If the web is peeled off at a time when the amount of residual solvent is larger, if the web is too soft, the flatness at the time of peeling will be lost, and slippage and vertical stripes are likely to occur due to the peeling tension. The amount of solvent is determined.

The residual solvent amount of the web is defined by the following formula.
Residual solvent amount (%) = (mass before web heat treatment−mass after web heat treatment) / (mass after web heat treatment) × 100
Note that the heat treatment for measuring the residual solvent amount represents performing heat treatment at 115 ° C. for 1 hour.

  The peeling tension at the time of peeling the metal support and the film is usually 196 to 245 N / m. If wrinkles easily occur during peeling, peeling is preferably performed with a tension of 190 N / m or less, and further, peeling is performed with a minimum tension that can be peeled to 166.6 N / m, and then with a minimum tension of 137.2 N / m. It is preferable to peel off at a minimum tension of -100 N / m.

  In the present embodiment, the temperature at the peeling position on the metal support is preferably −50 to 40 ° C., more preferably 10 to 40 ° C., and most preferably 15 to 30 ° C.

5) Drying and stretching step In the drying and stretching step, after peeling, a drying device that transports the web alternately through a plurality of rolls arranged in the drying device, and / or a tenter that clips and transports both ends of the web with clips. This is a step of drying the web using a stretching device.

  The drying means is generally one that blows hot air on both sides of the web, but there is also a means for heating by applying microwaves instead of wind. Too rapid drying tends to impair the flatness of the resulting film. Drying at a high temperature is preferably performed from about 8% by mass or less of residual solvent. Throughout the drying is generally carried out at 40-250 ° C. It is particularly preferable to dry at 40 to 160 ° C.

  When using a tenter stretching apparatus, it is preferable to use an apparatus that can independently control the film gripping length (distance from the start of gripping to the end of gripping) left and right by the left and right gripping means of the tenter. In the tenter process, it is also preferable to intentionally create sections having different temperatures in order to improve planarity.

  It is also preferable to provide a neutral zone between different temperature zones so that the zones do not interfere with each other.

  In addition, extending | stretching operation may be divided | segmented and implemented in multiple steps, and it is also preferable to implement biaxial stretching in a casting direction and a width direction. When biaxial stretching is performed, simultaneous biaxial stretching may be performed or may be performed stepwise.

  In this case, stepwise means that, for example, stretching in different stretching directions can be sequentially performed, stretching in the same direction is divided into multiple stages, and stretching in different directions is added to any one of the stages. Is also possible. That is, for example, the following stretching steps are possible.

a) Stretching in the casting direction-Stretching in the width direction-Stretching in the casting direction-Stretching in the casting direction b) Stretching in the width direction-Stretching in the width direction-Stretching in the casting direction-Stretching in the casting direction

  Simultaneous biaxial stretching includes stretching in one direction and contracting the other while relaxing the tension. The preferred draw ratio of simultaneous biaxial stretching can be in the range of x1.01 to x1.5 times in both the width direction and the longitudinal direction.

  The amount of residual solvent in the web when stretching is preferably 20 to 100% by mass at the start of stretching, and drying is preferably performed while stretching until the amount of residual solvent in the web is 10% by mass or less. More preferably, it is 5% by mass or less.

  30-160 degreeC is preferable, as for the drying temperature in the case of extending | stretching, 50-150 degreeC is more preferable, and 70-140 degreeC is the most preferable.

  In the stretching step, it is preferable that the temperature distribution in the width direction of the atmosphere is small from the viewpoint of improving the uniformity of the film, and the temperature distribution in the width direction in the stretching step is preferably within ± 5 ° C, and within ± 2 ° C. Is more preferable, and within ± 1 ° C. is most preferable.

6) Winding process The winding process is a process in which the amount of residual solvent in the web is 2% by mass or less and is wound as a film by a winder, and the amount of residual solvent is 0.4% by mass or less. Thus, a film having good dimensional stability can be obtained. It is particularly preferable to wind up at 0.00 to 0.10% by mass.

  As a winding method, a generally used method may be used. There are a constant torque method, a constant tension method, a taper tension method, a program tension control method with a constant internal stress, and the like.

  The protective film according to this embodiment is preferably a long film. Specifically, the protective film has a thickness of about 100 m to 5000 m and is usually provided in a roll shape. Moreover, it is preferable that the width | variety of a film is 1.3-4m, and it is more preferable that it is 1.4-2m.

<Manufacturing method of base material by melt casting film forming method>
Next, the method in the case of manufacturing the film base material of this embodiment by the melt casting film forming method is demonstrated.

<Melted pellet manufacturing process>
The composition containing a resin used for melt extrusion is usually preferably kneaded in advance and pelletized.

  Pelletization may be performed by a known method, for example, an additive consisting of a dried thermoplastic resin and a heat-shrinkable material is supplied to an extruder with a feeder, and kneaded using a single-screw or twin-screw extruder, It can be pelletized by extruding into a strand from a die, water cooling or air cooling, and cutting.

  It is important to dry the raw material before extruding to prevent decomposition of the raw material. In particular, since the cellulose ester easily absorbs moisture, it is preferable to dry it at 70 to 140 ° C. for 3 hours or more with a dehumidifying hot air dryer or a vacuum dryer to keep the moisture content at 200 ppm or less, and further 100 ppm or less.

  The additives may be mixed before being supplied to the extruder, or may be supplied by individual feeders. Moreover, in order to mix a small amount of additives, such as particle | grains and antioxidant, uniformly, it is preferable to mix beforehand.

  The antioxidant may be mixed with each other, and if necessary, the antioxidant may be dissolved in a solvent, impregnated with a thermoplastic resin and mixed, or mixed by spraying. May be.

From the viewpoint that drying and mixing can be performed simultaneously, it is preferable to use a vacuum nauter mixer or the like. Further, if the contact with air, such as the exit from the feeder unit or die, it is preferable that the atmosphere such as dehumidified air and dehumidified N ₂ gas.

  The extruder is preferably processed at as low a temperature as possible so that the shearing force is suppressed and the resin can be pelletized so as not to deteriorate (molecular weight reduction, coloring, gel formation, etc.). For example, in the case of a twin screw extruder, it is preferable to rotate in the same direction using a deep groove type screw. From the uniformity of kneading, the meshing type is preferable.

  A film is formed using the pellets obtained as described above. It is also possible to feed the raw material powder directly to the extruder with a feeder and form a film as it is without pelletization.

<Process for extruding molten mixture from die to cooling roll>
First, using a single-screw or twin-screw type extruder, the melt temperature Tm when extruding the pellet is about 200 to 300 ° C., filtered through a leaf disk type filter or the like to remove foreign matters, The film is coextruded into a film, solidified on a cooling roll, and cast while pressing with an elastic touch roll. Tm is the temperature of the die exit portion of the extruder.

  When introducing from the supply hopper to the extruder, it is preferable to prevent oxidative decomposition or the like under vacuum or reduced pressure or in an inert gas atmosphere.

  When foreign matter such as scratches or plasticizer aggregates adheres to the die, streak-like defects may occur. Such defects are also referred to as die lines, but in order to reduce surface defects such as die lines, it is preferable to have a structure in which the resin retention portion is minimized in the piping from the extruder to the die. . It is preferable to use a die that has as few scratches as possible inside the lip.

  The inner surface that contacts the molten resin such as an extruder or a die is preferably subjected to surface treatment that makes it difficult for the molten resin to adhere to the surface by reducing the surface roughness or using a material having a low surface energy. Specifically, a hard chrome plated or ceramic sprayed material is polished so that the surface roughness is 0.2 S or less.

  Although there is no restriction | limiting in particular in a cooling roll, What is necessary is just a roll provided with the structure where the heat medium which can control temperature inside, or a refrigerant | coolant body flows with a highly rigid metal roll. Although the size of the cooling roll is not limited, it may be sufficient to cool the melt-extruded film, and the diameter of the cooling roll is usually about 100 mm to 1 m.

  Examples of the surface material of the cooling roll include carbon steel, stainless steel, aluminum, and titanium. Further, in order to increase the hardness of the surface or improve the releasability from the resin, it is preferable to perform a surface treatment such as hard chrome plating, nickel plating, amorphous chrome plating, or ceramic spraying.

  The surface roughness of the chill roll surface is preferably 0.1 μm or less in terms of Ra, and more preferably 0.05 μm or less. The smoother the roll surface, the smoother the surface of the resulting film. Of course, it is preferable that the surface processed is further polished to have the above-described surface roughness.

  Examples of the elastic touch roll include JP 03-124425, JP 08-224772, JP 07-1000096, JP 10-272676, WO 97/028950, JP 11-235747, JP 2002-2002. It is possible to use a silicon rubber roll whose surface is coated with a thin film metal, as described in Japanese Patent Nos. 36332, 2005-172940, and 2005-280217.

  When peeling the film from the cooling roll, it is preferable to control the tension to prevent deformation of the film.

[Production method of composite resin film]
The film base material of this embodiment can be comprised with a composite resin film. As a method for producing a composite resin film, it can be produced by a production method of an embodiment having a film forming step by a coextrusion method.

<Co-extrusion method>
In the present embodiment, a film having a laminated structure can also be produced by a coextrusion method. For example, a film having a structure of skin layer / core layer / skin layer can be produced. For example, the matting agent can be contained in the skin layer in a large amount or only in the skin layer. The plasticizer and the ultraviolet absorber can be contained in the core layer more than the skin layer, and may be contained only in the core layer. In addition, the type of plasticizer and ultraviolet absorber can be changed between the core layer and the skin layer. For example, the skin layer contains a low-volatile plasticizer and / or an ultraviolet absorber, and the core layer has excellent plasticity. It is also possible to add a plasticizer or an ultraviolet absorber excellent in ultraviolet absorption. The glass transition temperature of the skin layer and the core layer may be different, and the glass transition temperature of the core layer is preferably lower than the glass transition temperature of the skin layer. At this time, the glass transition temperatures of both the skin and the core can be measured, and an average value calculated from these volume fractions can be defined as the glass transition temperature Tg and similarly handled. Also, the viscosity of the melt containing the cellulose ester during melt casting may be different between the skin layer and the core layer, and the viscosity of the skin layer> the viscosity of the core layer or the viscosity of the core layer ≧ the viscosity of the skin layer may be used.

  The above-mentioned co-extrusion method uses a plurality of extruders to heat and melt the resin to be laminated from each other, and after the respective resins are merged, co-extrusion is performed from the slit-shaped discharge port of the T die. Is a method of forming a cast sheet (unstretched state) by cooling and solidifying. As a method of joining the molten resin and extruding the sheet from the T-die, a feed block method in which the molten resin is joined and then the manifold is widened, and a multi-manifold method in which the molten resin is spread by the manifold and then joined together. Either of them can be used.

  〔Additive〕

(Antioxidant)
The film substrate preferably contains an antioxidant as an additive. Preferred antioxidants are phosphorous or phenolic, and it is more preferred to combine phosphorous and phenolic simultaneously. Hereinafter, the antioxidant that can be suitably used in the present embodiment will be described.

<Phenolic antioxidant>
In this embodiment, a phenolic antioxidant is preferably used, and a hindered phenol compound is particularly preferably used.

<Phosphorus antioxidant>
As the phosphorus antioxidant, phosphorus compounds such as phosphite, phosphonite, phosphinite, or tertiary phosphane can be used. A conventionally known compound can be used as the phosphorus compound. For example, Japanese Patent Application Laid-Open Nos. 2002-138188, 2005-344444, paragraph numbers 0022 to 0027, Japanese Patent Application Laid-Open No. 2004-18279, paragraph numbers 0023 to 0039, Japanese Patent Application Laid-Open No. 10-306175, Japanese Patent Application Laid-Open No. 1-254744, and Japanese Patent Application Laid-Open No. -270892, JP-A-5-202078, JP-A-5-178870, JP-T-2004-504435, JP-T-2004-530759, and JP-A-2005-353229. Is preferred.

  The addition amount of a phosphorus compound is 0.01-10 mass parts normally with respect to 100 mass parts of resin, Preferably it is 0.05-5 mass parts, More preferably, it is 0.1-3 mass parts.

(Other antioxidants)
Dilauryl-3,3′-thiodipropionate, dimyristyl-3,3′-thiodipropionate, distearyl-3,3′-thiodipropionate, pentaerythrityltetrakis (3-laurylthiopropioate) Nate) and the like, 2-tert-butyl-6- (3-tert-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2- [1- (2-hydroxy) -3,5-di-tert-pentylphenyl) ethyl] -4,6-di-tert-pentylphenyl acrylate and the like, heat-resistant processing stabilizers such as 3,4-dihydro-2H-1 described in JP-B-08-27508 -Benzopyran compounds, 3,3'-spirodichroman compounds, 1,1-spiroindane compounds, morpholine, thiomorpho Emissions, thiomorpholine oxide, thiomorpholine dioxide, a compound having a piperazine skeleton partial structure, oxygen scavenger dialkoxy benzene type compound in JP-03-174150 describes the like. These antioxidant partial structures may be part of the polymer or regularly pendant into the polymer and introduced into part of the molecular structure of additives such as plasticizers, acid scavengers, and UV absorbers. It may be.

(Other additives)
In addition to the above-described compounds, the film substrate according to the present embodiment can contain various compounds as additives depending on the purpose.

<Acid scavenger>
The acid scavenger preferably comprises an epoxy compound as an acid scavenger described in US Pat. No. 4,137,201. Epoxy compounds as such acid scavengers are known in the art and are derived by condensation of diglycidyl ethers of various polyglycols, particularly about 8-40 moles of ethylene oxide per mole of polyglycol. Metal glycol compounds such as polyglycols, diglycidyl ethers of glycerol (eg, those conventionally used in and together with vinyl chloride polymer compositions), epoxidized ether condensation products, bisphenol A Diglycidyl ether (ie, 4,4'-dihydroxydiphenyldimethylmethane), epoxidized unsaturated fatty acid ester (especially an ester of an alkyl of about 2 to 2 carbon atoms of a fatty acid of 2 to 22 carbon atoms (e.g. Butyl epoxy stealey ), And various epoxidized long chain fatty acid triglycerides, etc. (eg, epoxidized vegetable oils and other unsaturated natural oils, which are sometimes epoxidized, which can be represented and exemplified by compositions such as epoxidized soybean oil) These are referred to as natural glycerides or unsaturated fatty acids, which generally contain 12 to 22 carbon atoms)).

<Light stabilizer>
Light stabilizers include hindered amine light stabilizer (HALS) compounds, which are known compounds, such as columns 5-11 of US Pat. No. 4,619,956 and US Pat. , 839,405, as described in columns 3 to 5, including 2,2,6,6-tetraalkylpiperidine compounds, or acid addition salts thereof or complexes of them with metal compounds It is. Furthermore, the light stabilizer described in JP 2007-63311 A can be used.

<Ultraviolet absorber>
As the ultraviolet absorber, from the viewpoint of preventing deterioration due to ultraviolet rays, those having excellent absorption ability of ultraviolet rays having a wavelength of 370 nm or less and those having little absorption of visible light having a wavelength of 400 nm or more are preferable from the viewpoint of liquid crystal display properties. Examples include oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, nickel complex compounds, etc., but benzophenone compounds and less colored benzotriazole compounds preferable. Moreover, you may use the ultraviolet absorber of Unexamined-Japanese-Patent No. 10-182621, Unexamined-Japanese-Patent No. 8-337574, and the polymeric ultraviolet absorber of Unexamined-Japanese-Patent No. 6-148430.

  In the present embodiment, the ultraviolet absorber is preferably added in an amount of 0.1 to 20% by mass, more preferably 0.5 to 10% by mass, and further preferably 1 to 5% by mass. Two or more of these may be used in combination.

<Matting agent>
Fine particles such as a matting agent can be added to the film substrate of the present embodiment, and examples of the fine particles include inorganic compound fine particles and organic compound fine particles. Examples of the fine particles include inorganic fine particles such as silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, kaolin, talc, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate, and calcium phosphate. Crosslinked polymer fine particles can be mentioned. Among these, silicon dioxide is preferable because it can reduce the haze of the resin substrate. In many cases, fine particles such as silicon dioxide are surface-treated with an organic material, but such particles are preferable because they can reduce the haze of the resin substrate.

<Plasticizer>
A plasticizer can be used in combination with the cellulose ester film in order to improve moisture permeability, fluidity of the composition, and flexibility of the film. Examples of the plasticizer include phthalate esters, fatty acid esters, trimellitic esters, phosphate esters, polyesters, sugar esters, acrylic polymers, and the like. Among these, from the viewpoint of moisture permeability, polyester-based and sugar ester-based polymer plasticizers are preferably used.

  These plasticizers are preferably added in an amount of 0.5 to 30 parts by mass with respect to 100 parts by mass of the cellulose ester film.

[Hard coat layer]
A hard coat layer may be formed on the surface of the protective film (film substrate 4a) for the purpose of surface protection. The hard coat layer is preferably composed of, for example, an active energy ray curable resin.

(Active energy ray-curable resin)
The active energy ray-curable resin refers to a resin that cures through a crosslinking reaction or the like by irradiation with active rays such as ultraviolet rays or electron beams, and specifically, a resin having an ethylenically unsaturated group. More specifically, an ultraviolet curable urethane acrylate resin, an ultraviolet curable polyester acrylate resin, an ultraviolet curable epoxy acrylate resin, an ultraviolet curable polyol acrylate resin, an ultraviolet curable epoxy resin, or the like is preferably used. Of these, ultraviolet curable acrylate resins are preferred.

  As the ultraviolet curable acrylate resin, a polyfunctional acrylate is preferable. The polyfunctional acrylate is preferably selected from the group consisting of pentaerythritol polyfunctional acrylate, dipentaerythritol polyfunctional acrylate, pentaerythritol polyfunctional methacrylate, and dipentaerythritol polyfunctional methacrylate. Here, the polyfunctional acrylate is a compound having two or more acryloyloxy groups or methacryloyloxy groups in the molecule.

  The amount of the active energy ray-curable resin in the hard coat layer composition is usually 10 to 99 parts by mass, preferably 35 to 99 parts by mass, with the total composition being 100 parts by mass. When the blending amount of the active energy ray-curable resin is small, it is difficult to sufficiently obtain the film strength of the hard coat layer. Moreover, when there are many compounding quantities, since malfunctions, such as a film thickness uniformity at the time of apply | coating with the well-known coating method mentioned later and an application | coating stripe | line | muscle generate | occur | produce, it is unpreferable.

(Cationically polymerizable compound)
The hard coat layer may further contain a cationically polymerizable compound. The cationically polymerizable compound is a resin that undergoes cationic polymerization by energy active ray irradiation or heat. Specific examples include an epoxy group, a cyclic ether group, a cyclic acetal group, a cyclic lactone group, a cyclic thioether group, a spiro orthoester compound, and a vinyloxo group. Among them, a compound having a functional group such as an epoxy group or a vinyl ether group is preferably used in this embodiment.

  When the above-mentioned cationically polymerizable compound is contained in the hard coat layer composition, the amount of the cationically polymerizable compound in the hard coat layer composition is usually 1 to 90 parts by mass when the entire composition is 100 parts by mass. The amount is preferably 1 to 50 parts by mass.

(Fine particles)
The hard coat layer may contain fine particles. Examples of the fine particles include inorganic fine particles and organic fine particles. As inorganic particles, silica, titanium oxide, aluminum oxide, tin oxide, indium oxide, ITO, zinc oxide, zirconium oxide, magnesium oxide, calcium carbonate, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated Mention may be made of calcium silicate, aluminum silicate, magnesium silicate and calcium phosphate. As organic particles, polymethacrylic acid methyl acrylate resin powder, acrylic styrene resin powder, polymethyl methacrylate resin powder, silicon resin powder, polystyrene resin powder, polycarbonate resin powder, benzoguanamine resin powder, melamine resin powder, Examples thereof include polyolefin resin powder, polyester resin powder, polyamide resin powder, polyimide resin powder, and polyfluorinated ethylene resin powder. The average particle diameter of these fine particles is preferably 30 nm to 200 nm from the stability and clearness of the hard coat layer coating composition. The hard coat layer may contain two or more kinds of fine particles having different particle sizes. From the viewpoint of easily achieving the desired pencil hardness, the hard coat layer preferably contains silica fine particles.

  Moreover, it is preferable to make the hard coat layer contain reactive silica fine particles (Xa) surface-treated with an organic compound having a polymerizable unsaturated group from the viewpoint of better exhibiting the effects of the present embodiment.

  Moreover, it is preferable that a hard-coat layer contains the active energy ray-curable resin and microparticles | fine-particles which were mentioned above, and is active energy ray-curable resin: microparticles | fine-particles = 90: 10-20: 80 by content ratio.

(Other additives, manufacturing method of hard coat layer)
The hard coat layer preferably further contains a photopolymerization initiator in order to accelerate the curing of the active energy ray-curable resin. As a compounding quantity of a photoinitiator, it is preferable by mass ratio that it is photoinitiator: active energy ray hardening-type resin = 20: 100-0.01: 100.

  Specific examples of the photopolymerization initiator include alkylphenone series, acetophenone, benzophenone, hydroxybenzophenone, Michler's ketone, α-amyloxime ester, thioxanthone, and derivatives thereof, but are not particularly limited thereto. It is not a thing. Commercially available products may be used, and preferred examples include Irgacure 184, Irgacure 907, and Irgacure 651 manufactured by BASF Japan.

  Moreover, the hard coat layer may contain the same ultraviolet absorber as the above-mentioned ultraviolet absorber.

  Furthermore, the hard coat layer is composed of two or more layers, and the hard coat layer in contact with the film substrate contains an ultraviolet absorber, so that the objective effect of the present embodiment is satisfactorily exhibited, and the hard coat layer The film strength (abrasion resistance) and the pencil hardness are preferred from the viewpoint of obtaining good results. As content of a ultraviolet absorber, it is preferable that it is a mass ratio and is ultraviolet absorber: hard-coat layer composition = 0.01: 100-10: 100.

  When two or more hard coat layers are provided, the thickness of the hard coat layer in contact with the film substrate is preferably in the range of 0.05 to 2 μm. Two or more layers may be formed as a simultaneous multilayer. The simultaneous multi-layer is to form a hard coat layer by applying two or more hard coat layers on a base material without going through a drying step. In order to laminate the second hard coat layer on the first hard coat layer without a drying process, the layers are stacked one after another by an extrusion coater or simultaneously by a slot die having a plurality of slits. Can be done.

  In addition, as a method for producing a hard coat layer, a hard coat layer coating composition diluted with a solvent that swells or partially dissolves a cellulose ester film is applied, dried and cured on the cellulose ester film by the following method. The method of providing is preferable from the viewpoint that interlayer adhesion between the hard coat layer and the cellulose ester film is easily obtained.

  As the solvent for swelling or partially dissolving the cellulose ester film, a solvent containing a ketone and / or acetate ester is preferable. Specifically, examples of the ketone include methyl ethyl ketone, acetone, and cyclohexanone. Examples of the acetate ester include ethyl acetate, methyl acetate, and butyl acetate. The hard coat layer coating composition may contain an alcohol solvent as the other solvent.

  The coating amount of the hard coat layer coating composition is preferably 0.1 to 40 μm, more preferably 0.5 to 30 μm, as the wet film thickness. The dry film thickness is preferably about 5 to 20 μm, and preferably 7 to 12 μm.

  The hard coat layer is a gravure coater, a dip coater, a reverse coater, a wire bar coater, a die (extrusion) coater, a hard coat coating composition that forms a hard coat layer is applied using a known coating method such as an inkjet method, After application, the film can be dried, irradiated with actinic radiation (also referred to as UV curing treatment), and further subjected to heat treatment after UV curing as necessary. The heat treatment temperature after UV curing is preferably 80 ° C. or higher, more preferably 100 ° C. or higher, and particularly preferably 120 ° C. or higher. By performing the heat treatment after UV curing at such a high temperature, the mechanical strength (rubbing resistance, pencil hardness) of the hard coat layer becomes better.

<Functional layer>
In the hard coat film of this embodiment, functional layers such as a back coat layer, an antireflection layer and an antiglare layer can be provided in addition to the above hard coat layer.

(Back coat layer)
In the cellulose ester film of this embodiment, a back coat layer may be provided on the surface opposite to the side on which the hard coat layer is provided in order to prevent curling and blocking.

  In terms of curling and blocking prevention, the back coat layer includes silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, tin oxide, indium oxide, Particles such as zinc oxide, ITO, hydrated calcium silicate, aluminum silicate, magnesium silicate and calcium phosphate can be added.

  The particles contained in the backcoat layer are preferably 0.1 to 50% by mass with respect to the binder. When the back coat layer is provided, the increase in haze is preferably 0.5% or less, and particularly preferably 0.1% or less. As the binder, a cellulose ester resin is preferable. The coating composition for forming the backcoat layer preferably contains a solvent for alcohols, ketones and / or acetate ester sugars.

(Antireflection layer)
The hard coat film of the present embodiment can also be used as an antireflection film having an external light antireflection function by coating an antireflection layer on the hard coat layer.

  The antireflection layer is preferably laminated in consideration of the refractive index, the film thickness, the number of layers, the layer order, and the like so that the reflectance is reduced by optical interference. The antireflection layer is composed of a low refractive index layer having a refractive index lower than that of the film substrate as a support, or a combination of a high refractive index layer having a refractive index higher than that of the support and a low refractive index layer. Is preferred. Particularly preferably, it is an antireflection layer composed of three or more refractive index layers, and three layers having different refractive indexes from the support side are divided into medium refractive index layers (high refractive index layers having a higher refractive index than the support). Are preferably laminated in the order of a layer having a lower refractive index) / a high refractive index layer / a low refractive index layer. Alternatively, an antireflection layer having a layer structure of four or more layers in which two or more high refractive index layers and two or more low refractive index layers are alternately laminated is also preferably used.

  As the layer structure of the film having the antireflection layer, the following structure is conceivable, but is not limited thereto.

Cellulose acetate film / hard coat layer / low refractive index layer Cellulose acetate film / hard coat layer / medium refractive index layer / low refractive index layer Cellulose acetate film / hard coat layer / medium refractive index layer / high refractive index layer / low refractive index Layer Cellulose acetate film / hard coat layer / high refractive index layer (conductive layer) / low refractive index layer Cellulose acetate film / hard coat layer / antiglare layer / low refractive index layer

(Low refractive index layer)
The low refractive index layer preferably contains silica-based fine particles, and the refractive index is preferably in the range of 1.30 to 1.45 when measured at 23 ° C. and a wavelength of 550 nm.

  The film thickness of the low refractive index layer is preferably 5 nm to 0.5 μm, more preferably 10 nm to 0.3 μm, and most preferably 30 nm to 0.2 μm.

(High refractive index layer)
The refractive index of the high refractive index layer is preferably adjusted to a refractive index in the range of 1.4 to 2.2 by measuring at 23 ° C. and a wavelength of 550 nm. The thickness of the high refractive index layer is preferably 5 nm to 1 μm, more preferably 10 nm to 0.2 μm, and most preferably 30 nm to 0.1 μm. The refractive index can be adjusted by adding metal oxide fine particles and the like. The metal oxide fine particles used preferably have a refractive index of 1.80 to 2.60, more preferably 1.85 to 2.50.

(Anti-glare layer)
On the hard coat layer, an antiglare layer can be provided as a functional layer. The antiglare layer reduces the visibility of the reflected image by blurring the outline of the image reflected on the film surface, so that the reflected image is reflected when using an image display device such as a liquid crystal display, an organic EL display, or a plasma display. It is a layer that keeps you from worrying. Specifically, the antiglare layer has an arithmetic average roughness Ra of 0.1 to 0.1 by adding fine particles to the hard coat layer or a method of forming protrusions on the surface by pressing the mold. A layer adjusted to 1 μm is preferable.

(Adhesive layer)
The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (corresponding to the pressure-sensitive adhesive layer 30 in FIG. 1) used when bonding the touch panel to the display device is not particularly limited, and a known pressure-sensitive adhesive can be used. For example, an acrylic pressure-sensitive adhesive Silicone pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, polyester-based pressure-sensitive adhesives, and the like can be used, and acrylic pressure-sensitive adhesives that are relatively easy to control adhesive strength and storage elastic modulus are particularly preferable.

  As acrylic adhesives, methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, n-hexyl (meth) acrylate, (meth) acrylic 1 or 2 or more kinds of alkyl esters of 1 to 20 carbon atoms such as 2-ethylbutyl acid, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, decyl (meth) acrylate, and the alkyl acrylate Copolymerization with functional monomers such as (meth) acrylic acid, itaconic acid, maleic acid, maleic anhydride, 2-hydroxyethyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate that can be copolymerized with esters In combination, isocyanate crosslinker, epoxy crosslinker, aziridine crosslinker, metal chelate crosslinker It includes a crosslinking agent that is reacted.

  The thickness of the pressure-sensitive adhesive layer is preferably 1 μm to 13 μm. When the thickness of the pressure-sensitive adhesive layer is 1 μm or more, sufficient adhesive strength can be obtained, and when the thickness is 13 μm or less, it is possible to suppress the protrusion of glue during punching or cutting, and high pencil hardness is maintained. . The thickness of a preferable adhesive layer is 3-12 micrometers.

As the storage elastic modulus of the pressure-sensitive adhesive layer, the storage elastic modulus at 0 ° C. is preferably 1.0 × 10 ^{6 to} 1.0 × 10 ⁸ Pa. When the storage elastic modulus of the pressure-sensitive adhesive layer is 1.0 × 10 ⁶ Pa or more, sufficient punching processability, cutting processability and high pencil hardness can be obtained, and when it is 1.0 × 10 ⁸ Pa or less, sufficient adhesion Power is obtained. A preferable storage elastic modulus of the pressure-sensitive adhesive layer is 1.5 × 10 ^{6 to} 1.0 × 10 ⁷ Pa.

  Examples of the method of providing the pressure-sensitive adhesive layer on the film include a method of laminating a film on the pressure-sensitive adhesive layer prepared by applying a pressure-sensitive adhesive-containing composition to a release sheet and drying it. Examples of the method for applying the pressure-sensitive adhesive-containing composition include conventionally known methods such as bar coating, knife coating, roll coating, blade coating, die coating, gravure coating, and curtain coating. Moreover, you may make it laminate | stack an adhesive layer by apply | coating the said adhesive containing composition directly on the surface of a film, and making it dry.

  Although various release sheets can be used as the release sheet, the release sheet is typically composed of a base sheet having peelability on the surface. Examples of the base sheet include films such as polyester resin, polyethylene resin, polypropylene resin, polystyrene resin, and polycarbonate resin, films in which fillers such as fillers are blended with these films, and synthetic paper. Moreover, paper base materials, such as glassine paper, clay coat paper, and quality paper, are mentioned.

In order to give the surface of the base sheet peelability, a release agent such as a thermosetting silicone resin or an ultraviolet curable silicone resin may be attached to the surface by coating or the like. The coating amount of the release agent, 0.03~3.0g / m ² is preferred. The release sheet is laminated with the surface having the release agent in contact with the pressure-sensitive adhesive layer.

  [Anti-scattering film]

  The scattering prevention film 25 is provided on the electrode layer (second electrode pattern 24) in order to prevent the glass substrate 21 from scattering due to an external impact or the like. In this embodiment, the scattering prevention film 25 is comprised with the cellulose ester film of thickness 20-66 micrometers.

  Examples of the cellulose ester resin that can be used for the scattering prevention film 25 include cellulose ester resins that can be used for the above-described protective film (film substrate 4a).

  As such a cellulose ester film, a film having a retardation Ro in the in-plane direction of 0 nm to 10 nm can be preferably used. In this case, since there is little interference due to the phase difference in the in-plane direction, it is possible to improve the visibility when viewing the display panel 10 with the naked eye via the touch panel 20. When the retardation Ro in the in-plane direction is 0 nm to 10 nm, a cellulose ester having a total acyl substitution degree of 2.6 or more is preferably used, and a cellulose acetate (cellulose) having a total acyl substitution degree of 2.6 or more. Triacetate) is more preferably used.

  Further, as the cellulose ester film of the scattering prevention film 25, a film having a retardation Ro in the in-plane direction of 30 nm to 200 nm is used, and the slow axis of the scattering prevention film is 10 to 80 with respect to the transmission axis of the polarizer 3. It is preferable that they are arranged in the direction of °. With such a configuration, the linearly polarized light transmitted through the polarizer 3 can be changed to elliptically polarized light or circularly polarized light, so that the visibility when viewing the display device 10 with polarized sunglasses can be improved. . In the case of a film having a retardation Ro of 30 nm to 200 nm, a cellulose ester having a total acyl substitution degree of less than 2.6 is preferably used, and a cellulose acetate (cellulose diacetate) having a total acyl substitution degree of less than 2.6 is preferably used. More preferably used.

[Electromagnetic wave shielding layer]
The electromagnetic wave shielding layer formed on the electrode layer of the touch panel preferably contains at least a conductive substance, and further contains a binder, a photosensitive compound, and, if necessary, other components.

[Conductive substance]
There is no restriction | limiting in particular as an electroconductive substance, Although it can select suitably according to the objective, It is preferable to contain the fiber and electroconductive polymer in any one of a solid structure and a hollow structure.

  Here, the solid structure fiber may be referred to as a wire, and the hollow structure fiber may be referred to as a tube.

  In addition, a conductive fiber having an average minor axis length of 5 nm to 1,000 nm and an average major axis length of 1 μm to 100 μm may be referred to as “nanowire”.

  In addition, conductive fibers having an average minor axis length of 1 nm to 1,000 nm and an average major axis length of 0.1 μm to 1,000 μm and having a hollow structure may be referred to as “nanotubes”.

  The material of the conductive substance is not particularly limited as long as it has conductivity, and can be appropriately selected according to the purpose, but is preferably at least one of metal and carbon. Among these, the conductive fibers are preferably at least one of metal nanowires, metal nanotubes, and carbon nanotubes.

<Metal nanowires>
There is no restriction | limiting in particular as a material of metal nanowire, According to the objective, it can select suitably. For example, at least one metal selected from the group consisting of the fourth period, the fifth period, and the sixth period of the Long Periodic Table (IUPAC 1991) is preferred, and at least one kind selected from Group 2 to Group 14 is preferred. Metal is more preferable, and at least one metal selected from Group 2, Group 8, Group 9, Group 10, Group 11, Group 12, Group 13, and Group 14 is more preferable. It is particularly preferable to include it as a component.

  Examples of the metal include copper, silver, gold, platinum, palladium, nickel, tin, cobalt, rhodium, iridium, iron, ruthenium, osmium, manganese, molybdenum, tungsten, niobium, tantel, titanium, bismuth, antimony, and lead. Or alloys thereof. Among these, silver and an alloy with silver are preferable in terms of excellent conductivity.

  Examples of the metal used in the alloy with silver include platinum, osmium, palladium, and iridium. These may be used alone or in combination of two or more.

  There is no restriction | limiting in particular as a shape of metal nanowire, According to the objective, it can select suitably. For example, it can take an arbitrary shape such as a columnar shape, a rectangular parallelepiped shape, or a columnar shape having a polygonal cross section. In applications where high transparency is required, a cylindrical shape or a cross-sectional shape with rounded polygonal corners is preferable. The cross-sectional shape of the metal nanowire can be examined by applying a metal nanowire aqueous dispersion on the substrate and observing the cross-section with a transmission electron microscope (TEM).

  The average minor axis length (sometimes referred to as “average minor axis diameter” or “average diameter”) of the metal nanowires is preferably 1 nm to 50 nm. When the average minor axis length is less than 1 nm, the oxidation resistance deteriorates and the durability may deteriorate. When the average minor axis length exceeds 50 nm, scattering due to metal nanowires occurs and sufficient transparency is obtained. There are times when you can't. The average minor axis length is more preferably 10 nm to 40 nm, and further preferably 15 nm to 35 nm.

  The average short axis length of the metal nanowires was measured using a transmission electron microscope (TEM; manufactured by JEOL Ltd., JEM-2000FX), and 300 metal nanowires were observed. Find the minor axis length. In addition, the shortest axis length when the short axis of the metal nanowire is not circular is the longest axis.

  The average major axis length (sometimes referred to as “average length”) of the metal nanowires is preferably 1 μm to 40 μm. If the average major axis length is less than 1 μm, it may be difficult to form a dense network and sufficient conductivity may not be obtained. If it exceeds 40 μm, the metal nanowires are too long and manufactured. Sometimes entangled and agglomerates may occur during the manufacturing process. The average major axis length is more preferably 3 μm to 35 μm, and still more preferably 5 μm to 30 μm.

  The average major axis length of the metal nanowire is, for example, observed with 300 metal nanowires using a transmission electron microscope (TEM; manufactured by JEOL Ltd., JEM-2000FX). Find the average major axis length. In addition, when the metal nanowire is bent, a circle having the arc as an arc is taken into consideration, and a value calculated from the radius and the curvature is defined as the major axis length.

  Examples of the method for producing metal nanowires include, for example, JP 2009-215594 A, JP 2009-242880 A, JP 2009-299162 A, JP 2010-84173 A, and JP 2010-86714 A. The described method can be used. The method for producing the metal nanowire is not particularly limited and may be produced by any method. By reducing metal ions while heating in a solvent in which a halogen compound and a dispersion additive are dissolved as follows, It is preferable to manufacture.

<Metal nanotubes>
There is no restriction | limiting in particular as a material of a metal nanotube, What kind of metal may be sufficient, For example, the material of the above-mentioned metal nanowire etc. can be used.

  The shape of the metal nanotube may be a single layer or a multilayer, but is preferably a single layer from the viewpoint of excellent conductivity and thermal conductivity.

  The thickness of the metal nanotube (difference between the outer diameter and the inner diameter) is preferably 3 nm to 80 nm. When the thickness is less than 3 nm, the oxidation resistance may be deteriorated and the durability may be deteriorated. When the thickness is more than 80 nm, scattering due to the metal nanotube may occur. The thickness is more preferably 3 nm to 30 nm.

  The average major axis length of the metal nanotube is preferably 1 μm to 40 μm, more preferably 3 μm to 35 μm, and still more preferably 5 μm to 30 μm.

  There is no restriction | limiting in particular as a manufacturing method of the said metal nanotube, According to the objective, it can select suitably. For example, the method described in US Patent Application Publication No. 2005/0056118 and the like can be used.

<Carbon nanotube>
A carbon nanotube (CNT) is a substance in which a graphite-like carbon atomic surface (graphene sheet) is a single-layer or multilayer coaxial tube. Single-walled carbon nanotubes are called single-walled nanotubes (SWNT), multi-walled carbon nanotubes are called multi-walled nanotubes (MWNT), and in particular, double-walled carbon nanotubes are also called double-walled nanotubes (DWNT). In the conductive fiber used in the present embodiment, the carbon nanotube may be a single layer or a multilayer, but is preferably a single layer in terms of excellent conductivity and thermal conductivity.

  There is no restriction | limiting in particular as a manufacturing method of a carbon nanotube, According to the objective, it can select suitably. For example, catalytic hydrogen reduction of carbon dioxide, arc discharge method, laser evaporation method, thermal CVD method, plasma CVD method, vapor phase growth method, HiPco in which carbon monoxide is reacted with iron catalyst at high temperature and high pressure to grow in the vapor phase Known means such as a high-pressure carbon monoxide process can be used.

  In addition, the carbon nanotubes obtained by these methods have been highly purified to remove residues such as by-products and catalytic metals by methods such as washing, centrifugation, filtration, oxidation, and chromatography. It is preferable at the point which can obtain a carbon nanotube.

  The conductive fiber preferably has an aspect ratio of 10 or more. The aspect ratio generally means the ratio between the long side and the short side of the fibrous material (ratio of average major axis length / average minor axis length).

  There is no restriction | limiting in particular as a measuring method of an aspect ratio, According to the objective, it can select suitably, For example, the method etc. which measure with an electron microscope etc. are mentioned.

  When measuring the aspect ratio of the conductive fiber with an electron microscope, it is only necessary to confirm whether the aspect ratio of the conductive fiber is 10 or more with one field of view of the electron microscope. Moreover, the aspect ratio of the whole conductive fiber can be estimated by measuring the major axis length and the minor axis length of the conductive fiber separately.

  When the conductive fiber is in a tube shape, the outer diameter of the tube is used as the diameter for calculating the aspect ratio.

  The aspect ratio of the conductive fiber is not particularly limited as long as it is 10 or more, and can be appropriately selected according to the purpose, but is preferably 50 to 1,000,000. When the aspect ratio is less than 10, network formation with conductive fibers may not be performed, and sufficient conductivity may not be obtained. When the aspect ratio exceeds 1,000,000, the conductive fibers may be formed or in subsequent handling. Since the conductive fibers are entangled and aggregate before film formation, a stable liquid may not be obtained. The aspect ratio is more preferably 100 to 1,000,000.

  The ratio (ratio) of conductive fibers having an aspect ratio of 10 or more in the total conductive composition is preferably 50% or more by volume ratio. If the ratio is less than 50%, the conductive material that contributes to conductivity may decrease and conductivity may decrease. At the same time, a dense network cannot be formed, resulting in voltage concentration and durability. May fall. In addition, particles having a shape other than conductive fibers do not contribute greatly to conductivity and have absorption, which is not preferable. Especially in the case of metal, when plasmon absorption such as a sphere is strong, the transparency is deteriorated. May end up. The ratio is more preferably 60% or more, and particularly preferably 75% or more.

  Here, the ratio is, for example, when the conductive fiber is silver nanowire, the silver nanowire aqueous dispersion is filtered to separate the silver nanowire and the other particles, and the ICP emission analysis By measuring the amount of silver remaining on the filter paper and the amount of silver transmitted through the filter paper using an apparatus, the ratio of conductive fibers can be determined. By observing the conductive fibers remaining on the filter paper with a TEM, observing the short axis lengths of 300 conductive fibers and examining their distribution, the short axis length is 200 nm or less and the long axis length is It confirms that it is an electroconductive fiber whose length is 1 micrometer or more. Note that the filter paper measures the longest axis of particles other than the conductive fibers of the above size, and passes particles having a length not less than twice the longest axis and not more than the shortest length of the long axis of the conductive fibers. It is preferable to use one.

  Here, the average minor axis length and the average major axis length of the conductive fiber can be obtained by observing a TEM image or an optical microscope image using, for example, a transmission electron microscope (TEM) or an optical microscope. it can. In the present embodiment, the average minor axis length and the average major axis length of the conductive fibers are obtained by observing 300 conductive fibers with a transmission electron microscope (TEM) and calculating the average value.

<Binder>
The binder for immobilizing the conductive fiber is an organic polymer, and promotes at least one alkali solubility in a molecule (preferably a molecule having an acrylic copolymer as a main chain). It can be appropriately selected from alkali-soluble resins having a group (for example, carboxyl group, phosphoric acid group, sulfonic acid group, etc.).

  Among these, those that are soluble in an organic solvent and that can be developed with a weak alkaline aqueous solution are preferable, and those that have an acid-dissociable group and become alkali-soluble when the acid-dissociable group is dissociated by the action of an acid. Particularly preferred. In addition, an acid dissociable group represents the functional group which can dissociate in presence of an acid.

  For the production of the binder, for example, a known radical polymerization method can be applied. Polymerization conditions such as temperature, pressure, type and amount of radical initiator, type of solvent, etc. when producing an alkali-soluble resin by the above radical polymerization method can be easily set by those skilled in the art, and the conditions are determined experimentally. Can be determined.

  As the linear organic polymer, a polymer having a carboxylic acid in the side chain (photosensitive resin having an acidic group) is preferable.

  Examples of the polymer having a carboxylic acid in the side chain include, for example, JP-A-59-44615, JP-B-54-34327, JP-B-58-12777, JP-B-54-25957, JP-A-59-53836, A methacrylic acid copolymer, an acrylic acid copolymer, an itaconic acid copolymer, a crotonic acid copolymer, a maleic acid copolymer, and a partial esterification as described in each publication of Japanese Utility Model Publication No. 59-71048. A maleic acid copolymer, etc., an acidic cellulose derivative having a carboxylic acid in the side chain, an acid anhydride added to a polymer having a hydroxyl group, and a polymer weight having a (meth) acryloyl group in the side chain Coalescence is also preferred.

  Among these, benzyl (meth) acrylate / (meth) acrylic acid copolymers and multi-component copolymers composed of benzyl (meth) acrylate / (meth) acrylic acid / other monomers are particularly preferable.

  Furthermore, a high molecular polymer having a (meth) acryloyl group in the side chain and a multi-component copolymer comprising (meth) acrylic acid / glycidyl (meth) acrylate / other monomers are also useful. The polymer can be used by mixing in an arbitrary amount.

  In addition to the above, 2-hydroxypropyl (meth) acrylate / polystyrene macromonomer / benzyl methacrylate / methacrylic acid copolymer, 2-hydroxy-3-phenoxypropyl acrylate / polymethyl described in JP-A-7-140654 Methacrylate macromonomer / benzyl methacrylate / methacrylic acid copolymer, 2-hydroxyethyl methacrylate / polystyrene macromonomer / methyl methacrylate / methacrylic acid copolymer, 2-hydroxyethyl methacrylate / polystyrene macromonomer / benzyl methacrylate / methacrylic acid copolymer Coalescence, etc.

<Conductive polymer>
As the conductive polymer, for example, polyethylenedioxythiophene (PEDOT: PSS (Poly (3,4-ethylenedioxythiophene): Poly (styrenesulfonate)) containing polystyrenesulfonic acid can be used.

〔Example〕
Hereinafter, specific examples of the present invention will be described as examples. For comparison with the present invention, comparative examples will also be described. The present invention is not limited to the following examples. In the following description, “parts” or “%” indicates “parts by mass” or “mass%” unless otherwise specified.

<Production of touch panel module>
First, an ITO film having a thickness of 20 nm was formed on a glass substrate by a sputtering method, and this was etched to form a first electrode pattern extending in the X direction. Next, an interlayer insulating film made of SiO ₂ having a thickness of 200 nm was formed on the first electrode pattern by a sputtering method. Subsequently, an ITO film having a thickness of 20 nm was formed on the interlayer insulating film by a sputtering method, and this was etched to form a second electrode pattern extending in the Y direction. Further, an insulating film made of SiO ₂ having a thickness of 200 nm was formed on the second electrode pattern by a sputtering method.

  Next, Ag paste was applied to each electrode pattern in the X direction and Y direction made of an ITO film and sintered, and each electrode pattern and the control circuit were connected via lead wires.

  And the scattering prevention film (cellulose ester film or hard coat film) in which the conductive layer was formed was bonded on the 2nd electrode pattern (on insulating film) via the adhesive layer, and the touch panel module was produced. At this time, an acrylic pressure-sensitive adhesive was used as the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer. Hereinafter, preparation of a cellulose ester film and a hard coat film and formation of a conductive layer will be described.

(Preparation of cellulose ester film A-1)
<Cellulose ester resin>
The cellulose ester resins CE-1 and CE-2 are as follows.
CE-1: cellulose triacetate (acetyl group substitution degree: 2.91, weight average molecular weight Mw: 300,000)
CE-2: Cellulose diacetate (acetyl group substitution degree 2.41, weight average molecular weight Mw: 300,000)

<Fine particle dispersion 1>
Silica fine particles (Aerosil R972V manufactured by Nippon Aerosil Co., Ltd.)
11 parts by mass Ethanol 89 parts by mass The above was stirred and mixed with a dissolver for 50 minutes, and then dispersed with Manton Gorin.

<Fine particle addition liquid 1>
The fine particle dispersion 1 was slowly added to the dissolution tank containing methylene chloride with sufficient stirring. Further, the particles were dispersed by an attritor so that the secondary particles had a predetermined particle size. This was filtered through Finemet NF manufactured by Nippon Seisen Co., Ltd. to prepare a fine particle additive solution 1.
99 parts by mass of methylene chloride 5 parts by mass of fine particle dispersion 1

<Main dope A>
A main dope A having the following composition was prepared. First, methylene chloride and ethanol were added to the pressure dissolution tank. Next, cellulose acetate was added to the pressurized dissolution tank containing the solvent while stirring. This was completely dissolved with heating and stirring. This was designated as Azumi Filter Paper No. The main dope A was prepared by filtration using 244.
Methylene chloride 340 parts by mass Ethanol 64 parts by mass CE-1 (cellulose triacetate) 100 parts by mass Polyester compound 6 parts by mass Sugar ester compound 6 parts by mass Particulate additive solution 1 1 part by mass A dope was prepared. Then, using an endless belt casting apparatus, the dope was cast uniformly on a stainless steel belt support at a temperature of 33 ° C. and a width of 1500 mm. The temperature of the stainless steel belt was controlled at 30 ° C.

  Next, the solvent was evaporated until the residual solvent amount in the cast (cast) film reached 75% on the stainless steel belt support, and then peeled off from the stainless steel belt support with a peeling tension of 130 N / m.

  The peeled cellulose ester film was stretched 10% in the width direction using a tenter while applying heat at 160 ° C. The residual solvent at the start of stretching was 15%. Next, drying was terminated while the drying zone was conveyed by a number of rolls. The drying temperature was 130 ° C. and the transport tension was 100 N / m. After drying, the film was slit to a width of 1.5 m, a knurling process having a width of 10 mm and a height of 10 μm was applied to both ends of the film, wound into a roll, and a cellulose ester film A-1 having a dry film thickness of 25 μm was obtained. The winding length was 5200 m.

  In the cellulose ester film A-1, the retardation in the in-plane direction (retardation Ro) was 1 nm. The retardation Ro was measured using an automatic birefringence meter KOBRA-21ADH (Oji Scientific Instruments).

(Production of cellulose ester films A-2 to A-4)
Cellulose ester films A-2 to A- in the same manner as cellulose ester film A-1, except that the resin (type, degree of substitution), in-plane retardation Ro, and film thickness were changed as shown in Table 1. 4 was produced.

(Preparation of hard coat film)
On the produced cellulose ester film A-2, a hard coat layer composition filtered through a polypropylene filter having a pore size of 0.4 μm was applied using a micro gravure coater. Then, after drying at a constant rate drying zone temperature of 95 ° C. and a reduced rate drying zone temperature of 95 ° C., an ultraviolet lamp is used, the illuminance of the irradiated part is 100 mW / cm ² , and the irradiation amount is 0.1 J / cm ^2. Was cured to form a hard coat layer having a dry film thickness of 3 μm. And the film after formation was wound up and it was set as the roll-shaped hard coat film. The hard coat layer was produced only when an ITO film described later was formed as the conductive layer (electromagnetic wave shield layer).

(PET film)
As a comparative film, a polyethylene terephthalate film with an easy-adhesion layer (trade name: PET50T600E, thickness 50 μm, manufactured by Mitsubishi Plastics, Inc.) was prepared.

(Formation of conductive layer)
<Conductive layer C-1>
Silver nanowires were obtained by the method disclosed in Example 1 (synthesis of silver nanowires) in JP-T-2009-505358. That is, silver nanowires were synthesized by reduction of silver sulfate dissolved in ethylene glycol in the presence of polyvinylpyrrolidone (PVP). Note that the method of reducing metal ions and precipitating nano-sized metal particles by the reducing power of polyol (polyhydric alcohol) is also called a polyol method.

  Next, a silver nanowire-dispersed coating solution was obtained by the method disclosed in Example 8 (nanowire dispersion) of JP-T 2009-505358. That is, about 0.08% wt. HPMC (hydroxypropyl methylcellulose), about 0.36% wt. Silver nanowire, about 0.005% wt. Zonyl® FSO-100, and about 99.555% wt. Were mixed to obtain a silver nanowire-dispersed coating solution. This silver nanowire-dispersed coating solution was applied onto a cellulose ester film using a bar coater manufactured by Matsuo Sangyo Co., Ltd. and dried at 120 ° C. for 2 minutes to provide a silver nanowire coating film. Let this silver nanowire coating film be the conductive layer C-1.

<Conductive layer C-2>
Using an indium tin oxide target having a composition of In ₂ O ₂ / SnO ₂ = 90/10 on a hard coat film by sputtering under an argon / oxygen mixed gas introduction at a vacuum degree of 10 ⁻⁴ Torr Further, an ITO conductive thin film having a thickness of 250 nm was provided. This ITO conductive thin film is referred to as a conductive layer C-2.

<Conductive layer C-3>
In the same manner as in the method described in JP2011-102003A, a 50 mL container, 10 mg of a CNT composition containing a catalyst and CNT (converted when dried), and sodium carboxymethylcellulose (90 kDa, manufactured by Sigma) as a dispersant. (50-200 cps) 10 mg was weighed and distilled water was added to make 10 g, followed by dispersion treatment under ice cooling with an ultrasonic homogenizer output of 20 W for 20 minutes to prepare a CNT coating solution. Thereafter, the obtained liquid was centrifuged at 10,000 G for 15 minutes with a high-speed centrifuge, and 9 mL of supernatant was obtained. Then, this operation was repeated a plurality of times, and 5 mL of ethanol was added to 145 mL of the supernatant thus obtained, and a CNT dispersion coating liquid having a CNT concentration of about 0.1% by mass (combination ratio of CNT and dispersant) can be applied with a coater. 1 to 1) was obtained. The refractive index of the CNT conductive layer obtained by applying this CNT-dispersed coating liquid to quartz glass and drying was 1.82.

  Next, the above-mentioned CNT dispersion coating liquid was applied onto a cellulose ester film with a micro gravure coater (gravure wire number 150R, gravure rotation ratio 80%) and dried at 100 ° C. for 1 minute to form a CNT coating film. This CNT coating film is referred to as a conductive layer C-3.

<Conductive layer C-4>
A polyethylenedioxythiophene (PEDOT) dispersion containing polystyrene sulfonic acid is applied onto a cellulose ester film with a micro gravure coater, dried in a 100 ° C. oven and dried to cure, and 100 nm thick PEDOT: PSS A layer was formed. This PEDOT: PSS layer is referred to as a conductive layer C-4.

<Preparation of polarizing plate>
Next, production of a polarizing plate for a display panel will be described. The polarizing plate is produced by laminating a protective film on one surface of a polarizing film as a polarizer and laminating an optical film with low moisture permeability on the other surface. First, preparation of a protective film is demonstrated.

<Preparation of cellulose ester film B-1>
<Main dope B>
Methylene chloride 340 parts by mass Ethanol 64 parts by mass Cellulose triacetate (acetyl group substitution degree 2.88, MW 320,000)
100 parts by mass Polyester compound 6 parts by mass Sugar ester compound 6 parts by mass TINUVIN 928 (manufactured by BASF Japan Ltd.) 3 parts by mass Particulate additive solution 1 1 part by mass Azumi filter paper No. 1 manufactured by Azumi Filter Paper Co., Ltd. was dissolved completely. 24 was used to prepare the main dope B.

  Next, using a belt casting apparatus, the main dope B is uniformly cast on a stainless steel band support, and the solvent is evaporated with the stainless steel band support until the residual solvent amount reaches 100%. Peeled off. Then, the solvent contained in the web of the peeled cellulose ester film was evaporated at 35 ° C., slit to a width of 1.15 m, and dried at a drying temperature of 160 ° C. while being stretched 15% in the width direction by a tenter. Then, after drying for 15 minutes while transporting the inside of a drying device at 120 ° C. with many rolls, slitting to a width of 1.5 m, applying a knurling process with a width of 10 mm and a height of 5 μm at both ends of the film, and winding it on a winding core The cellulose ester film B-1 was obtained. The film thickness of the cellulose ester film B-1 was 30 μm, and the winding length was 5000 m.

  In the cellulose ester film B-1, the in-plane direction retardation (retardation Ro) was 3 nm. The retardation Ro was measured using an automatic birefringence meter KOBRA-21ADH (Oji Scientific Instruments).

<Production of cellulose ester films B-2 and B-3>
Cellulose ester films B-2 and B-3 were prepared in the same manner as described above except that only the film thickness was changed as shown in Table 1.

(Preparation of back surface protection film)
<Creation of back surface protective film D-1 (acrylic film)>
The following acrylic resin containing a lactone ring unit was prepared.

  According to Production Example 1 of JP 2008-9378 A [0222] to [0224], it was synthesized from 7500 g of methyl methacrylate and 2500 g of methyl 2- (hydroxymethyl) acrylate, having a lactonization rate of 98% and Tg = 134 ° C. An acrylic resin was obtained.

  The prepared acrylic resin is dried with a vacuum dryer at 90 ° C. to make the water content 0.03% or less, and then 0.3% by weight of a stabilizer (Irganox 1010 (manufactured by Ciba Gaigi Co., Ltd.)) is added at 230 ° C. In a nitrogen stream, a biaxial kneading extruder with a vent was used to extrude into water to form a strand, which was then cut to obtain a pellet having a diameter of 3 mm and a length of 5 mm.

  These pellets were dried in a vacuum dryer at 90 ° C. to a water content of 0.03% or less, and then kneaded at a supply unit 210 ° C., a compression unit 230 ° C., and a weighing unit 230 ° C. using a single-screw kneading extruder. did. At this time, a 300-mesh screen filter, a gear pump, and a leaf disk filter with a filtration accuracy of 7 μm were arranged in this order between the extruder and the die, and these were connected by a melt pipe. Furthermore, a static mixer was installed in the melt pipe immediately before the die. The difference between the temperature at both ends of the die and the temperature at the center of the die, the difference temperature between the die lip temperature and the die temperature, and the C / T ratio were set to predetermined conditions.

  Thereafter, a melt (molten resin) was extruded onto a triple cast roll. At this time, the touch roll was brought into contact with the most upstream cast roll (chill roll) at a predetermined surface pressure. A touch roll described in Example 1 of Japanese Patent Application Laid-Open No. 11-235747 (the one described as a double holding roll, except that the thickness of the thin metal outer cylinder is 2 mm) is used, and a predetermined touch pressure and touch roll are used. Used at temperature. In addition, the temperature of the triple cast roll containing a chill roll was made into touch roll temperature +3 degreeC, touch roll temperature -2 degreeC, and touch roll temperature -7 degreeC in order from the upstream.

  Then, after trimming both ends (5 cm each of the full width) immediately before winding, thicknessing (knurling) with a width of 10 mm and a height of 20 μm was applied to both ends. Further, the film-forming width was 1.5 m, and the film was wound up 3000 m at a film-forming speed of 30 m / min. The thickness of the film was 30 μm.

<Creation of back surface protective film D-2 (COP film)>
<Synthesis of polymer resin having alicyclic structure>
Under an ethylene atmosphere, toluene and a phenylnorbornene-toluene solution were placed in an autoclave having a volume of 1.6 l so that the phenylnorbornene concentration was 20 mol / l and the total liquid volume was 640 ml. Next, 5.88 mmol of methylaluminoxane (manufactured by Albemarle, MAO 20% toluene solution) and 1.5 μmol of methylene (cyclopentadienyl) (tetramethylcyclopentadienyl) zirconium dichloride were added on the basis of Al, and ethylene was introduced. Then, the reaction was carried out at 80 ° C. for 60 minutes while maintaining the pressure at 0.2 MPa.

  After completion of the reaction, ethylene was depressurized while allowing to cool, and the system was replaced with nitrogen. Thereafter, 3.0 g of silica (made by Fuji Silysia Co., grade: G-3 particle size: 50 μm) whose adsorbed water content was adjusted to 10% by mass was added and reacted for 1 hour. The reaction solution was put into a pressure filter (Advantech Toyo Co., Ltd., model KST-90-UH) set with filter paper (5C, 90 mm) and Celite (Wako Pure Chemical Industries, Ltd.), and pressure filtered with nitrogen. The polymerization solution was recovered. The polymerization solution was dropped dropwise in 5 times amount of acetone and deposited to obtain a polymer resin COP1 having an alicyclic structure. COP1 had a weight average molecular weight of 142,000 and a glass transition temperature of 140 ° C.

  The polymer resin COP1 having an alicyclic structure synthesized above is dried for 2 hours at 70 ° C. using a hot air dryer in which air is circulated to remove moisture, and then resin melt kneaded with a 65 mmφ screw A COP film having a film thickness of 100 μm was extruded using a T-die film melt extrusion molding machine (T-die width 500 mm) having a machine under molding conditions of a molten resin temperature of 240 ° C. and a T-die temperature of 240 ° C.

  Next, the peeled COP film was stretched 90% in the width direction using a tenter while applying heat at 200 ° C. Next, drying was completed while the drying zone was conveyed by a number of rollers. The drying temperature was 130 ° C. and the transport tension was 100 N / m. After drying, it was slit to a width of 1.5 m, a knurling process having a width of 10 mm and a height of 10 μm was applied to both ends of the film, wound into a roll, and a COP film D-2 having a dry film thickness of 25 μm was obtained. The winding length was 5000 m. The retardation of the COP film C-2 was measured by the same measurement method as described above. As a result, the retardation Ro was 0 nm.

(Production of polarizer)
100 parts by mass of polyvinyl alcohol (hereinafter abbreviated as PVA) having a saponification degree of 99.95 mol% and a polymerization degree of 2400 was impregnated with 10 parts by mass of glycerin and 170 parts by mass of water. The film was melt-extruded from a T die onto a metal roll to form a film. Then, it dried and heat-processed and obtained the PVA film.

  The obtained PVA film had an average thickness of 25 μm, a moisture content of 4.4%, and a film width of 3 m. Next, the obtained PVA film was continuously processed in the order of pre-swelling, dyeing, uniaxial stretching by a wet method, fixing treatment, drying, and heat treatment to produce a polarizing film as a polarizer. That is, the PVA film was preliminarily swollen in water at a temperature of 30 ° C. for 30 seconds, and immersed in an aqueous solution having an iodine concentration of 0.4 g / liter and a potassium iodide concentration of 40 g / liter at a temperature of 35 ° C. for 3 minutes. Subsequently, the film was uniaxially stretched 6 times in a 50% aqueous solution with a boric acid concentration of 4% under the condition that the tension applied to the film was 700 N / m, and the potassium iodide concentration was 40 g / liter and the boric acid concentration was 40 g / liter. Then, it was immersed in an aqueous solution having a zinc chloride concentration of 10 g / liter and a temperature of 30 ° C. for 5 minutes for fixing. Thereafter, the PVA film was taken out, dried with hot air at a temperature of 40 ° C., and further heat-treated at a temperature of 100 ° C. for 5 minutes. The obtained polarizing film had an average thickness of 13 μm, a polarizing performance of a transmittance of 43.0%, a polarization degree of 99.5%, and a dichroic ratio of 40.1.

(Lamination of film on polarizer)
According to the following processes 1-4, the protective film was bonded together on the surface of the polarizing film, and the back surface protective film was bonded together on the back surface of the polarizing film, and the polarizing plate was produced.

[Process 1]
The aforementioned polarizing film was immersed in a storage tank of a polyvinyl alcohol adhesive solution having a solid content of 2% by mass for 1 to 2 seconds.

[Process 2]
The alkali treatment was performed on the cellulose ester film B-1 under the following conditions.
(Alkali treatment)
Saponification step 2.5 mol / L-KOH 50 ° C. 120 seconds Water washing step Water 30 ° C. 60 seconds Neutralization step 10 parts by mass HCl 30 ° C. 45 seconds Water washing step Water 30 ° C. 60 seconds After saponification treatment, water washing, neutralization, water washing in this order Followed by drying at 100 ° C.

  Next, the polarizing film was immersed in the polyvinyl alcohol adhesive solution used in Step 1. Excess adhesive adhered to the immersed polarizing film was lightly removed, and this polarizing film was sandwiched between the cellulose ester film B-1 and the back surface protective film D-1, and laminated.

[Process 3]
The laminate was bonded with a rotating roller at a pressure of ^{20 to} 30 N / cm ² and a speed of about 2 m / min. At this time, care was taken to prevent bubbles from entering.

[Process 4]
The sample prepared in Step 3 was dried in a dryer at a temperature of 100 ° C. for 5 minutes to prepare a roll-shaped polarizing plate.

  Cellulose ester films B-2 and B-3 were also subjected to alkali treatment under the same conditions as described above, and then applied to the surface of the polarizing film, and the back surface protective film D-1 or D-2 was applied to the back surface of the polarizing film. I attached.

  For comparison, an optical film made of an acrylic resin was bonded to both surfaces of the polarizing film to produce a polarizing plate.

<Assembly of display device with touch panel>
With the touch panel, the electrode layer side of the touch panel and the polarizing plate side of the liquid crystal display device are bonded via an adhesive layer so that the bonding angle of the anti-scattering film to the polarizing plate is the angle shown in Table 1. A liquid crystal display device was constructed.

  More specifically, SVR1240 manufactured by Sony Chemical & Information Device Co. is applied as an adhesive to the surface of the protective film of the polarizing plate of the liquid crystal display device, and the liquid crystal display device and the touch panel are applied via the applied adhesive. Were pasted together. And both ultraviolet rays were irradiated to some adhesives, and both were temporarily fixed. Then, after inspecting for bubbles at the interface, the entire pressure-sensitive adhesive was completely cured by irradiation with ultraviolet rays.

  The combinations of the anti-scattering film, the conductive layer, the (surface) protective film, and the back surface protective film in the liquid crystal display devices with touch panels according to Examples 1 to 6 and Comparative Examples 1 to 4 are as shown in Table 1.

  The bonding angle of the scattering prevention film to the polarizing plate is an angle formed by the optical axis (transmission axis) of the polarizer (polarizing film) and the slow axis of the scattering prevention film. At this time, the direction of the slow axis of the anti-scattering film is determined by the Abbe refractometer (1T) as the average refractive index within the surface of the sample at an optical wavelength of 590 nm in an environment of temperature 23 ° C. and relative humidity 55% RH. Determined by measurement.

Moreover, the result of having measured the value of the retardation Ro in the in-plane direction of a scattering prevention film using automatic birefringence meter KOBRA-21ADH (Oji Scientific Instruments Co., Ltd.) is shown together in Table 1. In addition, the retardation Ro (nm) in the in-plane direction of a film is calculated | required by the following formula | equation.
Ro = (nx−ny) × d
Where d is the thickness (nm) of the film, nx is the refractive index in the slow axis direction, and ny is the refractive index in the direction perpendicular to the slow axis in the film plane.

<Evaluation of display device with touch panel>
(1) Evaluation of Peeling of Adhesive Layer 200 cycles of temperature change from -20 ° C to 80 ° C were performed in an environment with a relative humidity of 50% RH for a liquid crystal display device with a touch panel. did. The change of the bonding location of the adhesive layer between the taken out touch panel module of the liquid crystal display device and the liquid crystal display panel was visually observed. The evaluation criteria at this time are as follows.
○: No change (no peeling of adhesive layer).
(Triangle | delta): The edge of the adhesive layer has peeled slightly.
X: Other than the edge of the adhesive layer is peeled off.

(2) Evaluation of noise The occurrence of malfunction of the touch panel due to electrical noise at the time of image display of the liquid crystal display device, that is, when the TFT was turned on / off was examined. The evaluation criteria at this time are as follows.
○: No signal due to malfunction was detected from the touch panel.
X: A signal due to a malfunction was detected from the touch panel.

(3) Evaluation of interference The presence or absence of interference of the display panel when the liquid crystal display device with a touch panel was continuously lit for 100 hours under the condition of 60 ° C. and 90% was visually confirmed. The evaluation criteria at this time are as follows.
○: Interference is not visible.
Δ: Slight interference is visible.
X: Interference is visible.

(4) Evaluation of visibility with polarized sunglasses The liquid crystal display device with a touch panel was observed with polarized sunglasses, and the change in the color of the display image was examined. The evaluation criteria at this time are as follows.
○: No change in color of the displayed image.
Δ: A slight change in the color of the display image due to the angle occurs.
X: The change of the color of the display image by an angle arises.

(5) Thickness The film thickness of the anti-scattering film and the protective film for the polarizing plate was evaluated according to the following criteria.
○: The film thickness of the scattering prevention film is 66 μm or less, and the film thickness of the protective film is 30 μm or less.
X: The film thickness of the anti-scattering film is 66 μm or less, and the film thickness of the protective film does not satisfy at least one of the conditions.

[Evaluation results]
The evaluation results of Examples 1 to 6 and Comparative Examples 1 to 4 are shown in Table 2.

  From the results of Examples 1 to 6 and Comparative Example 1, it can be seen that the malfunction of the touch panel can be prevented by providing the conductive layer (electromagnetic wave shield layer) on the anti-scattering film of the touch panel. This is considered to be because electrical noise from the TFT of the liquid crystal display panel is blocked by the conductive layer by providing the conductive layer on the scattering prevention film.

  Moreover, from the results of Examples 1 to 6 and Comparative Examples 1 and 2, the anti-scattering film and the protective film for the polarizing plate both contain a highly moisture-permeable cellulose ester film, thereby suppressing peeling of the pressure-sensitive adhesive layer. You can see that it is made. This is because the moisture inside the display device is absorbed by both sides of the pressure-sensitive adhesive layer (touch panel side and liquid crystal display panel side) by the highly moisture-permeable scattering prevention film and the protective film, and therefore between the conductive layer and the pressure-sensitive adhesive layer. It seems that moisture does not accumulate in the adhesive layer, and this prevents the adhesive layer from peeling off due to the moisture.

  Further, in Comparative Examples 1, 3 and 4, the protective film thickness exceeds 30 μm, and in Comparative Examples 3 and 4, the scattering prevention film thickness exceeds 66 μm. It cannot be said that it contributes to the thinning of the entire apparatus.

  Therefore, according to the structure of Examples 1-6, the scattering prevention film of a touchscreen is comprised including a cellulose ester film with a thickness of 66 micrometers or less, an electrode layer is provided on this scattering prevention film, and the protective film of a polarizing plate By including a cellulose ester film with a thickness of 30 μm or less, it is possible to prevent malfunction of the touch panel due to the electrical noise of the TFT, while being a thin structure, and to adhere due to moisture inside the display device It can suppress that an agent layer peels. In addition, since both the cellulose ester film of the anti-scattering film and the cellulose ester film of the protective film have a film thickness of 20 μm or more, the above-mentioned anti-scattering function and the surface protective function of the polarizing plate are reliably secured, An effect can be obtained.

  Moreover, in Examples 1, 4, and 5, the cellulose ester film of the anti-scattering film is composed of a cellulose triacetate film (CE-1), and the retardation Ro in the in-plane direction is 0 nm to 10 nm. Thus, in Examples 1, 4, and 5, since the retardation Ro of the cellulose ester film is small, interference caused by the phase difference of the film can be reduced even during continuous display. In Examples 2, 3, and 6, the cellulose ester film of the anti-scattering film is composed of a cellulose diacetate film (CE-2), and the retardation Ro in the in-plane direction is 30 nm to 200 nm. The scattering angle of the anti-scattering film is 10 ° to 80 °. With such a configuration, linearly polarized light transmitted through the polarizer on the outside of the display device can be converted into elliptically polarized light, so that the visibility when wearing polarized sunglasses is improved.

  INDUSTRIAL APPLICATION This invention can be utilized for the display apparatus with a touch panel which bonded together the touch panel which has an electrode layer on a glass substrate, and the display apparatus which has a polarizing plate on a display panel through the adhesive layer.

DESCRIPTION OF SYMBOLS 1 Display panel 2 Polarizing plate 3 Polarizer 4 Film 4a Film base material (protective film)
4b Hard coat layer 5 Film (optical film)
DESCRIPTION OF SYMBOLS 10 Display apparatus 20 Touch panel 21 Glass substrate 22 1st electrode pattern (electrode layer)
24 Second electrode pattern (electrode layer)
25 Anti-scattering film 26 Electromagnetic wave shield layer 30 Adhesive layer

Claims (8)

A display device with a touch panel in which the electrode layer side of a touch panel having an electrode layer on a glass substrate and the polarizing plate side of a display device having a polarizing plate on a display panel are bonded via an adhesive layer. ,
The polarizing plate includes a polarizer and a protective film for protecting the surface of the polarizer on the touch panel side,
The touch panel includes, on the electrode layer, a scattering prevention film for preventing scattering of the glass substrate, and an electromagnetic wave shielding layer for blocking electrical noise from the display device,
The protective film is a cellulose ester film having a thickness of 20 to 30 μm,
The display device with a touch panel, wherein the scattering prevention film is a cellulose ester film having a thickness of 20 to 66 μm.   The display device with a touch panel according to claim 1, wherein the scattering prevention film has a retardation Ro in an in-plane direction of 0 nm to 10 nm.   The scattering prevention film has a retardation Ro in the in-plane direction of 30 nm to 200 nm, and is arranged so that the slow axis of the scattering prevention film is in the direction of 10 to 80 ° with respect to the transmission axis of the polarizer. The display device with a touch panel according to claim 1.   The display device with a touch panel according to claim 1, wherein the polarizing plate has a hard coat layer on the protective film.   The display device with a touch panel according to claim 1, wherein the electromagnetic wave shielding layer is composed of silver nanowires.   The display device with a touch panel according to claim 1, wherein the electromagnetic wave shielding layer is made of carbon nanotubes.   The display device with a touch panel according to claim 1, wherein the electromagnetic wave shielding layer is made of a conductive polymer. The polarizing plate, on the side opposite to the touch panel with respect to the polarizer, any one of claims 1 to 7, characterized in that the moisture permeability has the following optical film 200g / m ² / 24h A display device with a touch panel as described in 1.

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