JP2017054141A - Optical laminate for front surface of in-cell touch panel liquid crystal element, and in-cell touch panel liquid crystal display device, and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an optical laminate for a front surface of an in-cell touch panel liquid crystal element capable of preventing white turbidity of a liquid crystal screen.SOLUTION: There is provided a manufacturing method of an optical laminate for a front surface of an in-cell touch panel liquid crystal element including the following steps of (a) to (c): (a) a step of laminating optical laminate forming members including a retardation plate and a polarizing film to form an optical laminate; (b) a step of forming a conductive layer on at least one member of the optical laminate forming members; and (c) a step of, while exposing a surface of the conductive layer, performing earth processing on the surface of the conductive layer.SELECTED DRAWING: None

Description

  The present invention relates to an optical laminate for a front surface of an in-cell touch panel liquid crystal element, an in-cell touch panel liquid crystal display device, and a manufacturing method thereof.

2. Description of the Related Art In recent years, touch panel functions are mounted on portable liquid crystal terminals such as smartphones and other liquid crystal display devices. Conventionally, the liquid crystal display device equipped with such a touch panel function is mainly an external type in which a touch panel is mounted on the liquid crystal display device.
Since the external type is integrated after the liquid crystal display device and the touch panel are manufactured separately, one of them can be used even if there is a defect, and the yield is excellent. There was a problem that increased.
As a solution to such external problems (thickness and weight), a so-called on-cell type liquid crystal display device in which a touch panel is incorporated between the liquid crystal element and the polarizing plate of the liquid crystal display device has appeared. .
In recent years, a so-called in-cell type liquid crystal display device in which a touch function is incorporated in a liquid crystal element has been developed as a further reduction in thickness and weight than the on-cell type (Patent Documents 1 and 2). ).

JP 2011-76602 A JP2011-222009A

  The in-cell type liquid crystal display device has a configuration in which an optical laminated body in which films having various functions are bonded to each other through an adhesive layer on a liquid crystal element incorporating a touch function. Examples of the film having various functions include a retardation plate, a polarizing film, a polarizing film protective film, a cover glass, and the like.

  However, the in-cell touch panel liquid crystal display device provided with such an optical laminate has a problem that the liquid crystal screen is partially clouded when touched with a finger.

  The present invention has been made under such circumstances, and provides an optical laminate for the front surface of an in-cell touch panel liquid crystal element, an in-cell touch panel liquid crystal display device, and a manufacturing method thereof, which can prevent liquid crystal screens from becoming clouded. For the purpose.

  As a result of intensive studies to achieve the above object, the present inventors have worked as a conductive member in the conventional external type or on-cell type, the touch panel located on the operator side from the liquid crystal element. However, by switching to the in-cell type, it has been found that the absence of the conductive member on the operator side of the liquid crystal element is the cause of white turbidity, and the above object has been achieved.

That is, the manufacturing method of the optical laminated body for the front surface of the in-cell touchscreen liquid crystal element of this invention comprises the process of following (a)-(c).
(A) Step of laminating an optical laminate forming member including a retardation plate and a polarizing film to form an optical laminate (b) Step of forming a conductive layer on at least one member of the optical laminate forming member (c) A step of performing a ground treatment from the surface of the conductive layer in a state where the surface of the conductive layer is exposed. The method for manufacturing the in-cell touch panel type liquid crystal display device of the present invention is an optical for the front surface of the in-cell touch panel liquid crystal element of the present invention. The step of bonding the phase difference film side of the optical laminate obtained by the laminate production method and the in-cell touch panel liquid crystal element is performed.
Also, the optical laminate for the front surface of the in-cell touch panel liquid crystal element of the present invention is formed by laminating an optical laminate forming member including a retardation plate and a polarizing film, and conductive with at least one member of the optical laminate forming member. A layer is formed, and the surface of the conductive layer is grounded.
In the in-cell touch panel type liquid crystal display device of the present invention, the retardation film side of the optical laminate of the present invention and the in-cell touch panel liquid crystal element are bonded together.

  According to the method for producing an optical laminated body for the front surface of the in-cell touch panel liquid crystal element of the present invention, an optical laminated body capable of preventing white turbidity of a liquid crystal screen can be easily produced.

Sectional drawing which shows one Embodiment of the optical laminated body for the front surfaces of the in-cell touchscreen liquid crystal element of this invention. The top view which shows other embodiment of the optical laminated body for the front surfaces of the in-cell touchscreen liquid crystal element of this invention. Sectional drawing which shows an example of the in-cell touchscreen liquid crystal display device of this invention. Sectional drawing explaining the electricity supply state of a 1st conductive layer and a 2nd conductive layer.

[Method for producing optical laminate]
The manufacturing method of the optical laminated body for the front surfaces of the in-cell touchscreen liquid crystal element of this invention includes the process of following (a)-(c).
(A) Step of laminating an optical laminate forming member including a retardation plate and a polarizing film to form an optical laminate (b) Step of forming a conductive layer on at least one member of the optical laminate forming member (c) Performing a grounding process from the surface of the conductive layer with the surface of the conductive layer exposed.

<Process (a)>
Step (a) is a step of laminating an optical laminate forming member including a retardation plate and a polarizing film.
Examples of the optical laminate-forming member include a retardation plate and a polarizing film, and further include a polarizing film protective substrate and a surface protective substrate that are used as necessary.
Such an optical laminated body forming member can be laminated by bonding each member with an adhesive layer or the like. When a polyvinyl alcohol polarizing film (hereinafter sometimes referred to as “PVA polarizing film”) is used as the polarizing film, a separate adhesive layer is obtained by attaching water to the PVA polarizing film to develop adhesiveness. It is possible to stack even without using.
For the adhesive layer, urethane-based, acrylic-based, polyester-based, epoxy-based, vinyl acetate-based, vinyl chloride / vinyl acetate copolymer, cellulose-based adhesive, and the like can be used. The thickness of the adhesive layer is about 3 to 25 μm.

The order of stacking of the optical laminate is not particularly limited, but it is preferable to laminate the retardation plate so that the retardation plate is positioned on the surface of the optical laminate.
Moreover, when using a polarizing film protective substrate in addition to the retardation plate and the polarizing film as the optical laminate forming member, it is preferable to laminate the retardation plate, the polarizing film, and the polarizing film protective substrate in this order. .
Moreover, when using a surface protective substrate in addition to the phase difference plate and the polarizing film as the optical layer forming member, the optical layered body is laminated in the order of the phase difference plate, the polarizing film, and the surface protective substrate. Is preferred. At this time, the surface protective substrate is preferably laminated so as to be positioned in the uppermost layer of the optical laminate. For example, in the case of using a polarizing film protective substrate and a surface protective substrate in addition to the retardation plate and the polarizing film as the optical laminate forming member, the retardation plate, the polarizing film, the polarizing film protective substrate, the surface protective substrate It is preferable that the surface protective base material is positioned in the uppermost layer of the optical laminate.
In addition, the optical laminated body laminated | stacked in this way is used so that the phase difference plate side of an optical laminated body may face the in-cell touchscreen liquid crystal element side.
The detail of each member illustrated as an optical laminated body formation member is mentioned later.

<Step (b)>
Step (b) is a step of forming a conductive layer on at least one member of the optical laminate forming member. The conductive layer only needs to be formed on one member of the optical laminate forming member, but may be formed on two or more members. Further, the conductive layer may be formed on any surface side of the optical laminate forming member. That is, the conductive layer may be formed at an arbitrary position of the optical laminate.
Such a conductive layer has an alternative role of a touch panel that has been working as a conductive member in a conventional external type or on-cell type. Since the conductive layer is positioned closer to the operator than the liquid crystal element, it is possible to prevent the liquid crystal screen from becoming partially cloudy due to static electricity when touched.

Specific positions for forming the conductive layer include, for example, the surface of the retardation film on the polarizing film side, the surface of the retardation film opposite to the polarizing film side, the surface of the polarizing film protective substrate on the polarizing film side, and the polarization Examples include the surface of the film protective substrate opposite to the polarizing film, the surface of the surface protective substrate on the polarizing film side, the surface of the surface protective substrate opposite to the polarizing film side, and the like.
The conductive layer is preferably formed so as to be located on the surface of the optical laminate, and particularly preferably formed so as to be located on the surface facing the in-cell touch panel liquid crystal element. By forming the conductive layer so as to be positioned on the surface of the optical layered body, the step (c) described later can be performed after the completion of the step (a) and the step (b). It can prevent being adversely affected. In particular, by forming the conductive layer so as to be located on the surface facing the in-cell touch panel liquid crystal element, the conductive layer is not exposed when the optical laminate is bonded to the in-cell touch panel liquid crystal element. Can be maintained over the long term.
As described above, in order to form the conductive layer so as to be positioned on the surface facing the in-cell touch panel liquid crystal element, after forming the conductive layer on the retardation plate, the conductive layer is positioned on the surface. After laminating the optical laminate forming member including means for laminating with other members (polarizing film, etc.) and the retardation plate and the polarizing film so that the retardation plate is located on the surface, the conductive layer is placed on the retardation plate. A means for forming is mentioned.

  The timing of performing the step (b) varies depending on the position of the member forming the conductive layer in the optical laminate and on which side of the member the conductive layer is formed, before the step (a), the step ( In the middle of a), it can be determined by appropriately selecting from any timing after step (a).

  The conductive layer is formed by applying a conductive layer forming composition to be described later on the optical laminate-forming member and curing it as necessary, or transferring the conductive layer formed on another member to the optical laminate-forming member. It can be formed.

(Configuration of conductive layer)
The conductive layer has a role of releasing static electricity when touched and preventing white turbidity of the liquid crystal screen. However, when the in-cell touch panel is a capacitive type, there is a possibility that the operation of the touch panel may be hindered. For this reason, it is preferable that the surface resistivity of the conductive layer is 1.0 × 10 ^{8 to} 2.0 × 10 ⁹ Ω / □.

The conductive layer is formed from a conductive layer forming composition containing a conductive agent and, if necessary, a binder resin composition and a diluting solvent.
Examples of the conductive agent include ion conductive conductive agents such as quaternary ammonium salts and lithium salts, and electronic conductive conductive agents such as metal fine particles, metal oxide fine particles, carbon nanotubes, coating fine particles, and polyethylene dioxythiophene particles. Therefore, an electron conductive type conductive agent that is not easily affected by humidity is preferably used. Among the electron conductive type conductive agents, metal oxide fine particles are preferable from the viewpoint of long-term storage, heat resistance, moist heat resistance, and light resistance.

The metal constituting the metal fine particle is not particularly limited, and examples thereof include Au, Ag, Cu, Al, Fe, Ni, Pd, and Pt.
The metal oxide constituting the metal oxide fine particles is not particularly limited. For example, tin oxide (SnO ₂ ), antimony oxide (Sb ₂ O ₅ ), antimony tin oxide (ATO), indium tin oxide (ITO) , Aluminum zinc oxide (AZO), fluorinated tin oxide (FTO), ZnO and the like.
The coating fine particles are not particularly limited, and examples thereof include conventionally known fine particles having a configuration in which a conductive coating layer is formed on the surface of core fine particles. The core fine particles are not particularly limited, and examples thereof include inorganic fine particles such as colloidal silica fine particles and silicon oxide fine particles, fine polymer particles such as fluororesin fine particles, acrylic resin particles, and silicone resin particles, and fine particles such as organic inorganic composite particles. . Moreover, it does not specifically limit as a material which comprises a conductive coating layer, For example, the metal mentioned above or these alloys, the metal oxide mentioned above, etc. are mentioned.

  The electron conductive conductive agent preferably has an average particle size of 6 to 40 nm. By setting the thickness to 6 nm or more, the electron conductive conductive agents can easily come into contact with each other in the conductive layer. Therefore, the amount of the conductive agent added to impart sufficient conductivity can be suppressed. Further, it is possible to prevent the transparency and the adhesion between other layers from being impaired. The more preferable lower limit of the average particle diameter of the electron conduction type conductive agent is 7 nm, and the more preferable upper limit is 20 nm. The average particle diameter of the electron conductive conductive agent is a value obtained by TEM observation and measuring the particle diameter of ten electron conductive conductive agents and averaging the obtained values.

  The electron conduction type conductive agent is preferably chain-like or needle-like. The electron conductive conductive agent having such a shape can reduce the fluctuation of the surface resistivity of the conductive layer even when the conductive layer is somewhat deformed (curing shrinkage or expansion / contraction due to temperature and humidity).

The content of the electron conductive conductive agent in the conductive layer is appropriately adjusted according to the type, shape, size, and the like of the electron conductive conductive agent to be used. For example, for 100 parts by mass of the binder resin described later 100 to 300 parts by mass is preferable. By setting it to 100 parts by mass or more, the surface resistivity of the conductive layer can be easily reduced to 2.0 × 10 ⁹ Ω / □ or less, and by setting it to 300 parts by mass or less, the surface resistivity of the conductive layer is 1.0 × It can be easily increased to 10 ⁸ Ω / □ or more.
In addition, the minimum with more preferable content of an electron-conduction type electrically conductive agent is 150 mass parts, and a more preferable upper limit is 250 mass parts.

Examples of the binder resin composition include thermoplastic resins, thermosetting resin compositions, and ionizing radiation curable resin compositions, which can be used in appropriate combination. The binder resin composition may have adhesiveness, and when it has adhesiveness, it can be bonded to the in-cell touch panel liquid crystal element without forming an additional adhesive layer. In the binder resin composition, the thermoplastic resin can hardly change the surface resistivity due to deformation (curing shrinkage or expansion / contraction due to temperature and humidity) of the conductive layer, and the surface resistivity of the conductive layer is stable over time. It is preferable in that it can be given.
In addition, the thermoplastic resin illustrated in the 1st conductive layer mentioned later can be used for a thermoplastic resin, and a thermosetting resin composition and an ionizing radiation curable resin composition are illustrated as a cured layer of a surface protection base material. A single thermosetting resin composition or ionizing radiation curable resin composition or a mixture thereof can be used.

  The conductive layer may be composed of two or more layers (FIGS. 1 and 4). A two-layer structure of the conductive layer is preferable in that the surface resistivity of the conductive layer is easily stabilized over time. When the conductive layer 1 has a two-layer configuration, it is preferable to configure each conductive layer as follows, with one as the first conductive layer 11 and the other as the second conductive layer 12 (FIGS. 1 and 4).

  What was mentioned above can be used for the electrically conductive agent and binder resin of a 1st conductive layer. The conductive agent of the first conductive layer is preferably an electron conductive type conductive agent, and among them, metal fine particles and metal oxide fine particles are more preferable. Moreover, the range mentioned above is preferable about the average particle diameter and content of the electron conductive type conductive agent of a 1st conductive layer.

The binder resin for the first conductive layer is preferably a thermoplastic resin. By using a thermoplastic resin, it is possible to make it difficult for the surface resistivity to change due to deformation (curing shrinkage or expansion / contraction due to temperature and humidity) of the first conductive layer, and the surface resistivity of the conductive layer is stable over time. It is suitable at the point which can provide.
The thermoplastic resin preferably has no reactive functional group in the molecule. If the molecule has a reactive functional group, the reactive functional group may react to cause curing shrinkage in the conductive layer, which may change the surface resistivity. Reactive groups include functional groups having unsaturated double bonds such as acryloyl groups and vinyl groups, cyclic ether groups such as epoxy rings and oxetane rings, ring-opening polymerizable groups such as lactone rings, and isocyanates that form urethane. Groups and the like. These reactive functional groups may be included as long as they do not cause the surface resistivity to change due to curing shrinkage in the conductive layer.

  The thermoplastic resin preferably has a side chain. The thermoplastic resin having a side chain can be made to have excellent surface resistivity stability with time because the side chain is sterically hindered and hardly moves in the conductive layer. The side chain may have any structure, but preferably does not have the above-described reactive functional group in the molecule.

  The thermoplastic resin preferably has a glass transition temperature of 80 to 120 ° C. By making the glass transition temperature 80 ° C. or higher, destabilization of the surface resistivity due to the softness of the thermoplastic resin can be prevented, and by making the glass transition temperature 120 ° C. or lower, the thermoplastic resin is harder. It is possible to prevent a decrease in adhesion with other members. A more preferable lower limit of the glass transition temperature is 90 ° C., and a more preferable upper limit is 110 ° C.

  Specifically, polymethylmethacrylate is preferably used as the thermoplastic resin because it has a characteristic that it is easy to prevent bleed-out of the electron conductive conductive agent.

The second conductive layer has a role of allowing the static electricity generated on the surface of the optical layered body reaching the first conductive layer to flow further in the thickness direction to enable grounding to be described later.
Therefore, the first conductive layer has conductivity in the plane direction (X direction, Y direction) and the thickness direction (z direction), whereas the second conductive layer has conductivity in the thickness direction. The second conductive layer has a role different from that of the first conductive layer in that the conductivity in the plane direction is not always necessary.

  The second conductive layer is preferably configured to include conductive fine particles 121 (FIG. 4). The conductive fine particles have a role of establishing conduction between the surface of the second conductive layer and the first conductive layer, and making the second conductive layer have a predetermined surface resistivity. Such conductive fine particles are not particularly limited, and for example, coated fine particles in which a conductive coating layer is formed on the surface of the core fine particles are preferably used. As the material constituting the coating fine particles, the same material as the coating fine particles of the conductive layer described above can be used. From the viewpoint of improving conduction from the first conductive layer, the conductive fine particles are preferably gold-plated fine particles.

The second conductive layer is preferably formed from a second conductive layer forming composition containing conductive fine particles and a curable resin composition. When the second conductive layer forming composition contains the curable resin composition, the second conductive layer can compensate for the lack of hardness of the first conductive layer, the durability of the entire conductive layer is improved, and the surface resistivity is increased. The stability over time can be improved. Moreover, it is more preferable that the second conductive layer forming composition contains a thermoplastic resin.
As a curable resin composition, the thermosetting resin composition illustrated by description of the cured layer of the surface protection base material mentioned later, and an ionizing radiation curable resin composition individually or in mixture can be used.
The thermoplastic resin is preferably the same type as the thermoplastic resin contained in the first conductive layer from the viewpoint of adhesion with the first conductive layer.
In addition, when using together a curable resin composition and a thermoplastic resin, it is preferable that a thermoplastic resin shall be 10-70 mass parts with respect to 100 mass parts of curable resin compositions, and 20-60 mass parts. More preferably.

  The average particle diameter of the conductive fine particles is preferably equal to or larger than the thickness of the second conductive layer in order to obtain a predetermined surface resistivity. Specifically, the average particle diameter of the conductive fine particles is preferably 0.4 to 2.0 times, more preferably 0.5 to 1.6 times the thickness of the second conductive layer. preferable. By setting it to 0.4 times or more, conduction from the first conductive layer can be improved, and by setting it to 2.0 times or less, it is possible to prevent the conductive fine particles from dropping from the second conductive layer.

  The content of the conductive fine particles is preferably 0.5 to 2.0 parts by mass with respect to 100 parts by mass of the resin component in the second conductive layer. By setting it to 0.5 parts by mass or more, conduction from the first conductive layer can be improved, and by setting it to 2.0 parts by mass or less, deterioration of the coating properties and hardness of the second conductive layer is prevented. it can. A more preferable upper limit of the content of the conductive fine particles is 1.5 parts by mass.

As described above, the second conductive layer only needs to have conductivity in the thickness direction, and the conductivity in the surface direction is not necessarily required. Therefore, the resistivity specific to the second conductive layer is high. Also good. However, in order to improve the operability of the capacitive touch panel while effectively preventing white turbidity of the liquid crystal screen, the surface of the second conductive layer in the state where the first conductive layer and the second conductive layer are laminated. It is preferable that the surface resistivity measured by 1 is 1.0 × 10 ^{8 to} 2.0 × 10 ⁹ Ω / □.
At that time, the surface resistivity on the first conductive layer is preferably 1.0 × 10 ^{8 to} 2.0 × 10 ⁹ Ω / □. If the surface resistivity of the first conductive layer is less than 1.0 × 10 ⁸ , even if the surface resistivity in the state where the second conductive layer is laminated is 1.0 × 10 ⁸ or more, The operability of the capacitive touch panel is likely to be adversely affected. Moreover, when the surface resistivity of the first conductive layer exceeds 2.0 × 10 ⁹ , the surface resistivity in a state where the second conductive layer is laminated cannot be made 2.0 × 10 ⁹ or less, and the liquid crystal The cloudiness of the screen cannot be effectively prevented.

The thickness of the conductive layer is preferably 0.1 to 10 μm, and more preferably 0.5 to 8 μm.
When the conductive layer has a two-layer structure, the total thickness of the first conductive layer and the second conductive layer is within the above range and the second conductive layer is more conductive than the first conductive layer from the viewpoint of temporal stability of the surface resistivity. It is preferable to increase the thickness of the layer. The ratio of [thickness of second conductive layer] / [thickness of first conductive layer] is preferably 1.5 to 50, more preferably 5 to 30, and 10 to 20. Is more preferable.
The thickness of the conductive layer is a value obtained by observing and measuring a cross section using an electron microscope (for example, SEM, TEM, STEM, etc.).

For the conductive layer, a conductive layer forming composition comprising a composition constituting the conductive layer and a solvent to be added as necessary is applied on a retardation plate or a surface protective substrate, dried, and cured as necessary. Can be formed. The timing for forming the conductive layer may be before or after the optical laminate is laminated.
In addition, when a conductive layer consists of two layers, it is preferable to form so that a 2nd conductive layer may become an in-cell touchscreen liquid crystal element side rather than a 1st conductive layer.

  It is preferable to perform a process (a) and a process (b) by roll to roll. Productivity can be made favorable by performing both processes by roll-to-roll.

<Step (c)>
In the step (c), grounding is performed from the surface of the conductive layer with the surface of the conductive layer exposed. By performing the grounding treatment, it is possible to more effectively prevent liquid crystal white turbidity. Moreover, effective and efficient grounding can be performed by performing grounding with the surface of the conductive layer exposed.
When the conductive layer has the above-described two-layer structure of the first conductive layer and the second conductive layer, it is preferable to perform the grounding process from the surface of the second conductive layer.

The timing of performing the step (c) is at least after the step (b), but in the relationship with the step (a), depending on the position of the conductive layer in the optical laminate, the step (a) ) Can be selected and determined as appropriate from any timing after step (a). For example, when the conductive layer is located on the surface of the optical layered body, it may be at any timing before the step (a), during the step (a), or after the step (a). For example, when the conductive layer is located inside the optical layered body, the timing of performing the step (c) is preferably set to the timing before the step (a) or in the middle of the step (a).
In addition, it is preferable to perform a process (c) after a process (a) and (b) from a viewpoint of preventing that an earth process receives a bad influence in a subsequent process.

Examples of the grounding process include a method of connecting the surface of the conductive layer 1 to another conductive member 6 as shown in FIGS. At this time, it is preferable that the surface of the conductive layer 1 and the other conductive member 6 are connected to each other through a conductive wire 7. Moreover, it is preferable that the conducting wire 7 is fixed to the surface of the conductive layer 1 with a conductive adhesive material 8 such as a silver paste, a carbon tape, or a metal tape.
The ground treatment may be performed at one place on the surface of the conductive layer 1 or at a plurality of places. In addition, the other conductive member 6 is a place outside the effective area of the optical laminate 10 (outside the range in which an image can be visually recognized in the case of an in-cell touch panel liquid crystal display device) from the viewpoint of not affecting the optical characteristics. It is preferable to install the outer periphery of the conductive layer 1 or the optical laminate 10 outside the system.
In addition, when the conductive layer 1 has the two-layer structure of the first conductive layer 11 and the second conductive layer 12 described above, the area of the conductive adhesive material on the second conductive layer 12 may be 1 mm ² to 1 cm ^2. preferable. By setting the area to 1 mm ² or more, a plurality of conductive fine particles in the second conductive layer 12 can come into contact with the conductive adhesive material, and grounding can be made more effective, and the area can be reduced to 1 cm ² or less. By doing so, it is possible to make the ground portion invisible from the outside.

The other conductive member that is connected to or in close contact with the surface of the conductive layer preferably has a volume resistivity of 1.0 × 10 ⁶ Ωm or less from the viewpoint of making the ground treatment more effective. It is more preferably ³ Ωm or less, further preferably 1.0 Ωm or less, and particularly preferably 1.0 × 10 ⁻³ Ωm or less.
Examples of such other conductive members include silicon, carbon, iron, aluminum, copper, gold, silver, and alloys such as nichrome.

Between the steps (a) and (b) and the step (c), it is preferable to have a step of cutting the optical layered body into an arbitrary size.
Moreover, it is preferable to implement the said cutting process, after performing a process (a) and a process (b) so that a conductive layer may become the position of the outermost surface of an optical laminated body. Furthermore, at this time, it is preferable to perform the step (a) and the step (b) by roll-to-roll. By taking such a process, manufacturing can be made more efficient.
In order to position the conductive layer on the outermost surface of the optical layered body, an optical layered body is first prepared, and a method of forming the conductive layer on the outermost surface of the obtained optical layered body, or the outermost surface of the optical layered body is positioned. A method of forming a conductive layer on a member (such as a phase difference plate) and then laminating with another member so that the conductive layer becomes the outermost surface can be mentioned.
In order to cut the optical layered body, conventionally known methods such as laser cutting, die cutting, and cutting can be used.

<Optical laminate forming member>
(Phase difference plate)
The retardation plate has a configuration having at least a retardation layer. Examples of the retardation layer include a stretched film such as a stretched polycarbonate film, a stretched polyester film, and a stretched cyclic olefin film, and a layer containing a refractive index anisotropic material. In the former and latter modes, the latter mode is preferable from the viewpoint of retardation control and thinning.
A layer containing a refractive index anisotropic material (hereinafter sometimes referred to as an “anisotropic material-containing layer”) may be formed on the resin film even if it constitutes a retardation plate by itself. The structure which has an anisotropic material content layer may be sufficient.

The resins constituting the resin film include polyester resins, polyolefin resins, (meth) acrylic resins, polyurethane resins, polyether sulfone resins, polycarbonate resins, polysulfone resins, polyether resins, and polyethers. Examples include ketone-based resins, (meth) acrylonitrile-based resins, cycloolefin-based resins, and the like, and one or more of these can be used. Among these, cycloolefin resins are preferable from the viewpoints of dimensional stability and optical stability.
Examples of the refractive index anisotropic material include rod-like compounds, discotic compounds, and liquid crystal molecules.

When the refractive index anisotropic material is used, various types of retardation plates can be formed depending on the orientation direction of the refractive index anisotropic material.
For example, the optical axis of the refractive index anisotropic material is oriented in the normal direction of the anisotropic material-containing layer and has an extraordinary ray refractive index larger than the ordinary ray refractive index in the normal direction of the anisotropic material-containing layer. There is a so-called positive C plate.
In another aspect, the optical axis of the refractive index anisotropic material is parallel to the anisotropic material-containing layer and has an extraordinary ray refractive index larger than the ordinary ray refractive index in the in-plane direction of the anisotropic material-containing layer. A so-called positive A plate may be used.
Furthermore, by making the optical axis of the liquid crystal molecules parallel to the anisotropic material-containing layer and adopting a cholesteric orientation having a spiral structure in the normal direction, the anisotropic material-containing layer as a whole is more than the ordinary refractive index. A so-called negative C plate having a small extraordinary ray refractive index in the normal direction of the retardation layer may be used.
Furthermore, the discotic liquid crystal having negative birefringence anisotropy may be a negative A plate having its optical axis in the in-plane direction of the anisotropic material-containing layer.
Further, the anisotropic material-containing layer may be oblique to the layer, or may be a hybrid alignment plate whose angle changes in a direction perpendicular to the layer.
Such various types of retardation plates can be manufactured by, for example, a method described in JP-A-2009-053371.

The retardation plate may be composed of any one of the above-described positive or negative C plate, A plate, or hybrid alignment plate, but two or more of these one or a combination of two or more thereof. It may consist of the following plate. For example, when the liquid crystal element of the in-cell touch panel is a VA system, it is preferable to use a combination of a positive A plate and a negative C plate. In the case of an IPS system, the positive C plate is combined with a positive A plate or a biaxial plate. However, any combination can be used as long as the viewing angle can be compensated, and various combinations are conceivable and can be appropriately selected.
When the retardation plate is composed of two or more plates, from the viewpoint of thinning, one plate is used as a stretched film, and an anisotropic material-containing layer (other plate) is laminated on the stretched film. Embodiments are preferred.

  In the case where the retardation plate has an anisotropic material-containing layer on the resin film, the retardation plate is preferably arranged so that the resin film side faces the polarizing film side. By arrange | positioning in such an orientation, the resin film of a phase difference plate can be functioned as a back surface protective film of a polarizing film, and the thickness of an optical laminated body can be reduced.

  The thickness of the retardation plate is preferably 15 to 80 μm, and more preferably 20 to 60 μm. In addition, when the retardation plate is composed of two or more plates, by setting one plate as a stretched film and laminating an anisotropic material-containing layer (other plate) on the stretched film, It can be easily within the above thickness range.

(Polarizing film)
A polarizing film is located between a phase difference plate and a surface protection base material.
As the polarizing film, any polarizing film having a function of transmitting only light having a specific vibration direction may be used. For example, a PVA film obtained by stretching a PVA film and dyeing with iodine or a dichroic dye is used. Examples include polarizing films, polyene polarizing films such as PVA dehydrated products and polyvinyl chloride dehydrochlorinated products, reflective polarizing films using cholesteric liquid crystals, and thin film crystalline film polarizing films. Among these, a PVA polarizing film that exhibits adhesiveness with water and can adhere a retardation plate or a surface protective substrate without providing an additional adhesive layer is preferable.

Examples of PVA polarizing films include hydrophilic polymer films such as PVA films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films, as well as two types of iodine and dichroic dyes. A uniaxially stretched product by adsorbing a chromatic substance can be mentioned. Among these, from the viewpoint of adhesiveness, a polarizing film composed of a PVA film and a dichroic substance such as iodine is preferably used.
The PVA resin constituting the PVA film is formed by saponifying polyvinyl acetate.

  The thickness of the polarizing film is preferably 2 to 50 μm, more preferably 3 to 30 μm.

(Polarizing film protective substrate)
The polarizing film protective substrate is used for the purpose of protecting the polarizing film, and may be located on both sides of the polarizing film, but is preferably located on the opposite side of the polarizing film from the retardation plate. By having the retardation film on one surface of the polarizing film and having the polarizing film protective substrate on the opposite surface, the number of members can be reduced.
Examples of such a polarizing film protective substrate include transparent plastic films such as a triacetyl cellulose film, an acrylic resin film, a polycarbonate film, a cyclic olefin film, and a polyester film. In addition, by using an optically anisotropic substrate such as a plastic film having a retardation value of 3000 to 30000 nm or a plastic film having a quarter wavelength retardation as the transparent plastic film, the visibility when observed through polarized sunglasses can be improved. This is preferable in terms of points. In addition, the visibility through polarized sunglasses means that unevenness of different colors (hereinafter also referred to as “NIJIMURA”) is not observed on the display screen when the optical layered body is disposed on the front surface of the liquid crystal display element. .
The thickness of the polarizing film protective substrate is preferably 4 to 500 μm, and more preferably 4 to 250 μm.

(Surface protective substrate)
The surface protective substrate is located on the surface of the optical laminate (the surface of the optical laminate opposite to the retardation film of the polarizing film with respect to the polarizing film), and gives the stiffness to the optical laminate, It has a role which protects the surface of a laminated body. The protective function of the polarizing film can also be achieved by using the surface protective film in contact with the polarizing film.
Examples of the surface protective substrate include cover glass, plastic plate, laminated plastic film and the like. Among these, a laminated plastic film suitable for roll-to-roll production is preferable.
A conventionally known cover glass can be used, and the thickness is preferably 0.3 to 1.0 mm, more preferably 0.3 to 0.7 mm.
A conventionally known plastic plate can be used, and the thickness is preferably 0.3 to 2.0 mm, more preferably 0.3 to 1.0 mm.
The laminated plastic film has a cured layer formed from a curable resin composition such as a thermosetting resin composition or an ionizing radiation curable resin composition on one or both sides of a transparent plastic film such as a polyester film, Examples include a laminate of a plurality of transparent plastic films such as a polyester film via an adhesive layer. The thickness of the laminated plastic film is preferably 60 to 250 μm, more preferably 60 to 150 μm. In addition, as a transparent plastic film which comprises a laminated plastic film, when using optically anisotropic base materials, such as a plastic film with a retardation value of 3000-30000 nm, and a plastic film of 1/4 wavelength phase difference, when observing through polarized sunglasses It is suitable in that it can prevent nitjira.

  The thermosetting resin composition includes a curable resin such as an acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, silicone resin, and a curing agent added as necessary. Or a monomer comprising the curable resin and a curing agent.

  As the ionizing radiation curable resin composition, a photopolymerizable prepolymer that can be crosslinked and cured by irradiation with ionizing radiation (ultraviolet ray or electron beam) can be used. A (meth) acrylic prepolymer having two or more (meth) acryloyl groups and having a three-dimensional network structure by crosslinking and curing is particularly preferably used. Examples of the (meth) acrylic prepolymer include urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, polyfluoroalkyl (meth) acrylate, and silicone (meth) acrylate. An acrylic prepolymer that can be used and has excellent reactivity is preferred. These (meth) acrylic prepolymers can be used alone, but it is preferable to add a photopolymerizable monomer in order to improve the crosslinkability and further improve the hardness of the cured layer.

  Examples of the photopolymerizable monomer include monofunctional acrylic monomers such as 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, butoxyethyl (meth) acrylate, 1,6- Bifunctional acrylic monomers such as hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, hydroxypivalate ester neopentyl glycol di (meth) acrylate , Dipentaerythritol hexa (meth) acrylate, trimethylpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate and other polyfunctional (meth) acrylic mono Is used one or more types of chromatography such, it is preferable to use a polyfunctional acrylic monomer.

In addition to the photopolymerizable prepolymer and the photopolymerizable monomer, the ionizing radiation curable resin composition preferably uses an additive such as a photopolymerization initiator or a photopolymerization accelerator when it is cured by ultraviolet irradiation.
Examples of the photopolymerization initiator include acetophenone, benzophenone, Michler's ketone, benzoin, benzylmethyl ketal, benzoylbenzoate, α-acyloxime ester, thioxanthone and the like.
Further, the photopolymerization accelerator can reduce the polymerization obstacle due to air at the time of curing and increase the curing speed. For example, p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, and the like. can give.
The ionizing radiation curable resin composition may contain inorganic particles in order to improve the hardness after curing.

  The cured layer of the laminated plastic film may be in a semi-cured state at the stage of the step (a) or the cutting step described above. When the cured layer is in a semi-cured state, it is preferable in that the optical laminate can be easily cut. In addition, when the laminated plastic film is a type having a cured layer formed from a thermosetting resin composition or an ionizing radiation curable resin composition on one or both sides of a transparent plastic film, the cured layer is semi-cured. The state is preferable in that the adhesiveness between the cured layer and another member (for example, a polarizing film) can be improved.

  A functional layer may be provided on the surface that is the surface of the optical laminate of the surface protective substrate (the surface of the optical laminate opposite to the retardation film of the polarizing film with respect to the polarizing film). Examples of the functional layer include an antireflection layer, an antiglare layer, an anti-fingerprint layer, an antifouling layer, an abrasion resistant layer, and an antibacterial layer. These functional layers are preferably formed from a thermosetting resin composition or an ionizing radiation curable resin composition, and more preferably formed from an ionizing radiation curable resin composition.

<In-cell touch panel liquid crystal device>
The in-cell touch panel liquid crystal element is a liquid crystal element in which a liquid crystal is sandwiched between two glass substrates, and a touch panel function such as a resistive film type, a capacitance type, and an optical type is incorporated therein. Examples of the liquid crystal display method of the in-cell touch panel liquid crystal element include an IPS method, a VA method, a multi-domain method, an OCB method, an STN method, and a TSTN method.
In-cell touch panel liquid crystal elements are described in, for example, Japanese Patent Application Laid-Open Nos. 2011-76602 and 2011-222009.

[Method of manufacturing in-cell touch panel liquid crystal display device]
The manufacturing method of the in-cell touch panel liquid crystal display device of the present invention is the retardation film side of the optical laminate obtained by the above-described optical laminate manufacturing method for the front surface of the in-cell touch panel liquid crystal display of the present invention, and the in-cell touch panel liquid crystal element side. The process which bonds together is performed.
The in-cell touch panel liquid crystal element and the optical laminate can be bonded to each other through an adhesive layer, for example.
For the adhesive layer, urethane-based, acrylic-based, polyester-based, epoxy-based, vinyl acetate-based, vinyl chloride / vinyl acetate copolymer, cellulose-based adhesive, and the like can be used. The thickness of the adhesive layer is about 10 to 25 μm.

[Optical Laminate for Front of In-cell Touch Panel Liquid Crystal Display]
The optical laminate for the front surface of the in-cell touch panel liquid crystal display element of the present invention (hereinafter referred to as “optical laminate of the present invention”) is formed by laminating an optical laminate forming member including a retardation plate and a polarizing film, A conductive layer is formed on at least one member of the optical layered body forming member, and grounding is performed from the surface of the conductive layer.
The embodiment of the constituent requirements of the optical layered body of the present invention is as described above.

[In-cell touch panel liquid crystal display]
The in-cell touch panel liquid crystal display device of the present invention is formed by bonding the retardation film side of the optical laminate of the present invention described above and the in-cell touch panel liquid crystal element side.
The structural requirements of the optical laminate of the present invention and the embodiment of the in-cell touch panel liquid crystal element are as described above.

  EXAMPLES Next, although an Example demonstrates this invention still in detail, this invention is not limited at all by these examples.

<Configuration of adhesive layer>
As an adhesive layer used in the Examples, an adhesive composed of 100 parts of an acrylic adhesive (manufactured by Toyo Ink Manufacturing Co., Ltd., Olivevine BPS1109), 2.5 parts of a curing agent (manufactured by Toyo Ink Manufacturing Co., Ltd., Olivevine BHS8515) and a diluent solvent. A layer A coating solution formed by coating and drying was used.

<In-cell touch panel liquid crystal device>
A capacitance-type in-cell touch panel liquid crystal element incorporated in a commercially available liquid crystal display device (manufactured by Sony Ericsson, Expert P) was prepared.

<Phase difference film>
As a retardation film, a stretched cyclic olefin film (Arton, film thickness 28 μm, retardation value 100 nm) manufactured by JSR was prepared.

<Preparation of polarizing film>
A polyvinyl alcohol film having a thickness of 80 μm was stretched up to 3 times while being dyed for 1 minute in an iodine solution of 0.3% concentration at 30 ° C. between rolls having different speed ratios. Thereafter, the total draw ratio was stretched to 6 times while being immersed in an aqueous solution containing 60% at 4% concentration of boric acid and 10% concentration of potassium iodide for 0.5 minutes. Next, after washing by immersing in an aqueous solution containing potassium iodide at 30 ° C. and 1.5% concentration for 10 seconds, drying was performed at 50 ° C. for 4 minutes to obtain a polarizing film having a thickness of 20 μm.

<Measurement and evaluation of physical properties of optical laminate>
The physical property measurement and evaluation of the optical laminates of Examples and Comparative Examples were performed as follows. The results are shown in Table 1.
[Surface resistivity]
Based on JIS K6911, the surface resistivity (Ω / □) of the conductive layer immediately after the production of the optical laminate was measured. High resistivity meter Hi-Lester UP MCP-HT450 (Mitsubishi Chemical Co., Ltd.) is used, and URS probe MCP-HTP14 (Mitsubishi Chemical Co., Ltd.) is used as the probe, in an environment of temperature 25 ± 4 ° C and humidity 50 ± 10% The surface resistivity (Ω / □) was measured at an applied voltage of 500V.
When the conductive layer has a two-layer structure, the surface resistivity on the second conductive layer was measured.
[Stability of surface resistivity over time]
The surface resistivity (Ω / □) of the conductive layer after holding the optical laminate at 80 ° C. for 100 hours was measured, and (surface resistivity after holding at 80 ° C. for 100 hours) / (surface resistivity immediately after manufacture) The ratio was calculated. In addition, the surface of the conductive layer of the optical layered body is rubbed 10 times (stroke 100 mm) with steel wool (No. 0000) applied with a load of 100 g, and it is visually confirmed whether or not scratch marks are visible on the surface of the conductive layer. did. As a result, the ratio was 0.5 or more and less than 3 and no scratch marks were observed, “◎”, and the ratio was 0.5 or more and less than 3, but scratch marks were observed as “◯”. .
[LCD screen cloudy]
On the in-cell touch panel liquid crystal element, the optical laminates of Examples and Comparative Examples were bonded together through an adhesive layer having a thickness of 20 μm. Next, a protective film (a known protective film such as a polyethylene protective film or a PET protective film) was further bonded onto the outermost surface of the optical laminate. Next, whether the white turbidity phenomenon occurred when the liquid crystal display device was driven and touched by hand immediately after removing the bonded protective film was visually evaluated.
○: White turbidity is not visible Δ: Slight white turbidity may be visually recognized, but extremely microscopic ×: White turbidity is noticeable conspicuously [Nizimura]
The optical laminates of the example and the comparative example are bonded to the in-cell touch panel liquid crystal element through an adhesive layer having a thickness of 20 μm, and the screen is displayed in white or substantially white. It was evaluated whether or not Nijimura (rainbow pattern) can be visually observed from various angles.
○: The rainbow pattern is not visible ×: The rainbow pattern is visible [operability]
On the in-cell touch panel liquid crystal element, the optical laminates of Examples and Comparative Examples were bonded together through an adhesive layer having a thickness of 20 μm. Next, it was visually evaluated whether or not the liquid crystal / touch sensor was driven without any trouble when touched by hand from the uppermost surface of the optical laminate.
○: Driven without any problem Δ: Slightly malfunctioning may be seen, but drive ×: Not working

[Example 1]
(1) Preparation of surface protective base material [adjustment of outermost cured layer coating solution]
Pentaerythritol triacrylate (manufactured by Nippon Kayaku Co., Ltd., PET-30), polymer-containing acrylate resin (manufactured by Arakawa Chemical Co., Ltd., Beam Set DK-1), silica fine particle dispersion (manufactured by JSR, KZ6406), It added in methyl isobutyl ketone and stirred so that solid content of 3 components might become 50 parts, 25 parts, and 25 parts in order, and the solution a was obtained.
Next, 7 parts by mass of a photopolymerization initiator (BASF Japan, Irgacure 184) and 1.5 parts by mass of a photopolymerization initiator (BASF Japan, Lucyrin TPO) are added to 100 parts of the solid content of the solution a. Then, the mixture was stirred and dissolved to prepare a solution b having a final solid content of 40% by mass.
Next, 0.4 parts of a leveling agent (product name: Mega-Fac RS71, manufactured by DIC Corporation) is added to the solid content of the solution b at a solid content ratio and stirred to prepare a composition for the hardened layer for the outermost surface. did.
[Adjustment of the back surface cured layer coating solution]
Pentaerythritol triacrylate (manufactured by Nippon Kayaku Co., Ltd., PET-30), polymer-containing acrylate resin (manufactured by Arakawa Chemical Co., Ltd., Beam Set DK-1), silica fine particle dispersion (manufactured by JSR, KZ6406), It added in methyl isobutyl ketone and stirred so that solid content of 3 components might become 50 parts, 25 parts, and 25 parts in order, and the solution c was obtained.
Next, 4 parts by mass of a photopolymerization initiator (BASF Japan Co., Ltd., Irgacure 184) is added to 100 parts by weight of the solution c, and the mixture is stirred and dissolved to obtain a solution d having a final solid content of 40% by mass. Prepared.
Subsequently, a leveling agent (manufactured by DIC, MegaFac MCF350-5) and an anti-blocking agent (manufactured by CIK Nanotech, SIRMIBK15WT% -E65) are added to 100 parts of the solid content of the solution d. It added and stirred so that it might become 0.1 part and 1.5 parts in order, and the composition for back surface cured layers was prepared.
[Formation of cured layer]
First, a composition for a hardened layer for the outermost surface on a biaxially stretched polyester film having a thickness of 5.7 μm (manufactured by Toray Industries Inc., Lumirror 5N88, approximately 1/4 wavelength retardation film having a wavelength difference of 134.0 nm at a wavelength of 589.3 nm). The product was applied by slit reverse coating so that the film thickness after drying was 50 μm to form a coating film. The obtained coating film was dried at 70 ° C. for 1 minute, and then irradiated with ultraviolet rays at an ultraviolet irradiation amount of 240 mJ / cm ² to cure the coating film to form a cured layer. Subsequently, the composition for back surface cured layers was apply | coated to the reverse surface by slit reverse coating so that it might become the film thickness of 50 micrometers after drying. The obtained coating film was dried at 70 ° C. for 1 minute, and then irradiated with ultraviolet rays at an ultraviolet irradiation amount of 240 mJ / cm ² to cure the coating film to form a cured layer, thereby obtaining a surface protective substrate.

(2) Formation of conductive layer HRAG acrylic (25) MIBK (thermoplastic resin, weight average molecular weight 70,000, glass transition temperature 100 ° C.) manufactured by DNP Fine Chemical Co. is dissolved in propylene glycol monomethyl ether, and JGC Catalysts & Chemicals V3560 (ATO dispersion, ATO average particle diameter of 8 nm) made by adding and stirring, adjusting the final solid content to 8% by mass, the ratio of thermoplastic resin: ATO to 100: 200 (mass ratio), conductive A layer composition was obtained.
Next, the conductive layer composition was applied onto the retardation film by slit reverse coating so that the dry coating thickness was 0.3 μm and dried to form a conductive layer.

(3) Production of optical layered product The conductive film provided with the conductive layer on one surface of the polarizing film while spraying water on the polarizing film with the retardation film with the conductive layer, the polarizing film, and the surface protective substrate prepared above. The retardation film was bonded to the other surface with a surface protective substrate to obtain an optical laminate. In addition, the pasting was performed such that the back cured layer side of the surface protective substrate was directed to the polarizing film side, and the retardation film side of the retardation film with a conductive layer was directed to the polarizing film side.
In addition, a conductive wire is fixed to one portion of the outer edge portion of the surface of the conductive layer of the obtained optical layered body using a silver paste, and the conductive wire (Nichrome, volume resistance value 1.5 × 10 ⁻⁶ Ωm) ). The area of the fixing part was 2 mm ² .

[Example 2]
An optical laminate was produced in the same manner as in Example 1 except that the second conductive layer was formed by the following method on the conductive layer (first conductive layer) of Example 1.
(Formation of second conductive layer)
Pentaerythritol triacrylate (PETA) and HRAG acrylic (25) MIBK (thermoplastic resin) manufactured by DNP Fine Chemical Co., methyl ethyl ketone (MEK) so that the solid content of the two components is 70 parts and 30 parts, respectively. Was added to a mixed solvent of / isopropanol (IPA), stirred and dissolved to obtain a solution e.
Next, 4 parts by mass of a photopolymerization initiator (BASF Japan, Irgacure 184) and leveling agent (10-301 (TL), manufactured by Dainichi Seika Kogyo Co., Ltd.) are 0 with respect to 100 parts of the solid content of the solution e. 2 parts were added and stirred to prepare solution f.
Next, 0.83 parts by mass of conductive fine particle dispersion (DNP Fine Chemical Co., Ltd., Bright dispersion, conductive fine particle average particle diameter 4.6 μm, solid content 25%) is added to 100 parts by mass of the resin component of solution f. Stirring is performed, and finally an ultraviolet absorber (TINSFI477, manufactured by BASF Japan Ltd.) is added to 6 parts with respect to 100 parts of the solid content of the solution f and stirred, for the second conductive layer having a total solid content of 25%. A composition was obtained.
The composition for the second conductive layer was applied on the conductive layer (first conductive layer) previously formed by slit reverse coating so as to have a dry coating amount of 6 g / m ² to form a coating film. After drying the obtained coating film at 70 ° C. for 1 minute, the coating film is cured by irradiating with ultraviolet rays at an ultraviolet irradiation amount of 80 mJ / cm ² to form a second conductive layer having a thickness of 5 μm to obtain an optical laminate. It was.

[Example 3]
An optical laminate was prepared in the same manner as in Example 2 except that the first conductive layer of Example 2 was changed to a dry coating thickness of 1.0 μm, and the second conductive layer was changed to a dry coating amount of 4 g / m ² and a thickness of 3 μm. Obtained.

[Example 4]
In Example 1, the optical laminate was obtained in the same manner as in Example 1 except that the ratio of the thermoplastic resin: ATO of the composition for the conductive layer was changed to 100: 400 and the dry coating thickness was changed to 1 μm. It was.

[Example 5]
An optical laminate was obtained in the same manner as in Example 2 except that the second conductive layer of Example 2 was changed to a dry coating amount of 10 g / m ² and a thickness of 9 μm.

[Example 6]
An optical laminate was obtained in the same manner as in Example 2 except that the second conductive layer of Example 2 was changed to a dry coating amount of 13 g / m ² and a thickness of 12 μm.

[Comparative Example 1]
The optical lamination was performed in the same manner as in Example 1 except that the conductive layer was not formed and the polyester film having a thickness of 5.7 μm was changed to a non-optical anisotropic polyester film having a thickness of 23 μm (T600E25N, manufactured by Mitsubishi Plastics). The body was made.
[Comparative Example 2]
An optical laminate was prepared in the same manner as in Example 1 except that the conductive layer was not formed and the polyester film having a thickness of 5.7 μm was changed to a triacetyl cellulose film having a thickness of 25 μm (KC2UASW, manufactured by Konica Minolta). did.

As can be seen from Table 1, the optical laminates of Examples 1 to 6 were able to prevent white turbidity of Nizimura and liquid crystals, and were excellent in surface resistivity stability over time and in-cell touch panel operability. Moreover, since the manufacturing method of the optical laminated body of Examples 1-6 performs an earth process in the state which exposed the conductive layer, it could manufacture an optical laminated body easily. In particular, in the optical laminates of Examples 1 to 3 and 5, the surface resistivity of the conductive layer is in the range of 1.0 × 10 ^{8 to} 2.0 × 10 ⁹ Ω / □. It was excellent in operability while completely suppressing the above.

1: Conductive layer 11: First conductive layer 12: Second conductive layer 121: Conductive fine particles 2: Phase difference plate 3: Polarizing film 4: Surface protective substrate 5: Adhesive layer 6: Conductive member 7: Conductor 8: Conductive Adhesive material 10: optical laminate 20: in-cell touch panel liquid crystal element 30: in-cell touch panel liquid crystal display device

Claims (13)

The manufacturing method of the optical laminated body for the front surfaces of an in-cell touchscreen liquid crystal element including the process of following (a)-(c).
(A) Step of laminating an optical laminate forming member including a retardation plate and a polarizing film to form an optical laminate (b) Step of forming a conductive layer on at least one member of the optical laminate forming member (c) Performing a grounding process from the surface of the conductive layer with the surface of the conductive layer exposed.   The manufacturing of the optical laminated body for the front surface of the in-cell touch-panel liquid crystal element of Claim 1 which forms a conductive layer on the surface on the opposite side to the surface located in the polarizing film side of retardation film in the said process (b). Method.   The optical laminate-forming member includes a surface protective substrate, and in the step (a), the retardation plate, the polarizing film, and the surface protective substrate are in this order, and the surface protective substrate is the uppermost layer. The manufacturing method of the optical laminated body for the front surfaces of the in-cell touchscreen liquid crystal element of Claim 1 or 2 laminated | stacked on. The optical laminated body for the front surface of the in-cell touch panel liquid crystal element according to any one of claims 1 to 3, wherein the conductive layer has a surface resistivity of 1.0 x 10 ^{8 to} 2.0 x 10 ⁹ Ω / □. Manufacturing method.   The manufacturing method of the optical laminated body for the front surfaces of the in-cell touchscreen liquid crystal element in any one of Claims 1-4 whose said conductive layer is a 2 layer structure of a 1st conductive layer and a 2nd conductive layer.   The manufacturing method of the optical laminated body for the front surfaces of the liquid crystal element in any one of Claims 1-5 which performs the process of producing the laminated body of the said process (a) by roll-to-roll.   The step (a) and the step (b) are performed so that the conductive layer is positioned on the outermost surface of the optical laminate, and the optical laminate at this stage is cut into an arbitrary size, and then the step (c The manufacturing method of the optical laminated body for the front surfaces of the liquid crystal element in any one of Claims 1-6.   The manufacturing method of the optical laminated body for the front surfaces of the in-cell touchscreen liquid crystal element in any one of Claims 1-7 whose said in-cell touchscreen liquid crystal element is a capacitance-type in-cell touchscreen liquid crystal element.   The manufacturing method of the in-cell touchscreen liquid crystal display device which performs the process of bonding the phase difference film side of the optical laminated body obtained by the manufacturing method in any one of Claims 1-8, and an in-cell touchscreen liquid crystal element.   An optical laminate forming member including a retardation plate and a polarizing film is laminated, and a conductive layer is formed on at least one member of the optical laminate forming member, and a ground treatment is performed from the surface of the conductive layer. An optical laminate for the front surface of an in-cell touch panel liquid crystal element. The optical laminated body for the front surface of the in-cell touch-panel liquid crystal element of Claim 10 whose surface resistivity of the said conductive layer is 1.0 * 10 < ⁸ > -2.0 * 10 < ⁹ > ohm / square.   The optical laminate for a front surface of an in-cell touch panel liquid crystal element according to claim 10 or 11, wherein the conductive layer has a two-layer structure of a first conductive layer and a second conductive layer.   An in-cell touch panel liquid crystal display device, wherein the retardation film side of the optical laminate according to claim 10 and an in-cell touch panel liquid crystal element are bonded together.