JP6508169B2 - Optical laminate for front of in-cell touch panel liquid crystal element, in-cell touch panel liquid crystal display device, and method of manufacturing them - Google Patents

Description

  The present invention relates to 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 method of manufacturing them.

In recent years, a touch panel function has been incorporated in portable liquid crystal terminals representing smartphones and other liquid crystal display devices. Conventionally, in the liquid crystal display device having such a touch panel function, an external type in which the touch panel is mounted on the liquid crystal display device has been the mainstream.
The external type is integrated after separately manufacturing the liquid crystal display and the touch panel, so even if there is a defect in one of the two, one can be used and the yield is excellent, but the thickness and weight Was a problem.
So-called on-cell liquid crystal display devices have been introduced which incorporate a touch panel between a liquid crystal element of a liquid crystal display device and a polarizer as a solution to the problem of such external attachment type (thickness and weight). .
Further, in recent years, so-called in-cell liquid crystal display devices in which a touch function is incorporated in a liquid crystal element are being developed as a device for reducing the thickness and weight more than the on-cell type (Patent Documents 1 and 2) ).

JP, 2011-76602, A JP, 2011-222009, A

  The in-cell type liquid crystal display device has a configuration in which an optical laminate in which films having various functions and the like are attached via an adhesive layer is provided on a liquid crystal element incorporating a touch function. Examples of the film having various functions include a retardation plate, a polarizing film, a protective film of the polarizing film, and a cover glass.

  However, in the in-cell touch panel liquid crystal display device in which such an optical laminate is installed, there is 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 of an in-cell touch panel liquid crystal element, an in-cell touch panel liquid crystal display device, and a method of manufacturing them, which can prevent the clouding of the liquid crystal screen. The purpose is

  As a result of intensive studies to achieve the above object, the inventors of the present invention have found that in the conventional external type and on-cell type, the touch panel located closer to the operator than the liquid crystal element works as a conductive member. However, it has been found that the absence of the conductive member on the operator side of the liquid crystal element due to the switching to the in-cell type is the cause of the clouding, and the above object has been achieved.

That is, the manufacturing method of the optical laminated body for the front surfaces of the in-cell touch-panel liquid crystal element of this invention comprises the process of following (a)-(c).
(A) laminating an optical laminate forming member including a retardation plate and a polarizing film to form an optical laminate (b) forming a conductive layer on at least one member of the optical laminate forming member (c) The step of performing grounding treatment from the surface of the conductive layer in a state in which the surface of the conductive layer is exposed. Further, the method of manufacturing the in-cell touch panel 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 retardation film side of the optical laminate obtained by the method for producing a laminate and the in-cell touch panel liquid crystal element is performed.
In the optical laminate for the front surface of the in-cell touch panel liquid crystal element of the present invention, an optical laminate forming member including a retardation plate and a polarizing film is laminated, and conductive to 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 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.

  According to the method of manufacturing an optical laminate for the front surface of the in-cell touch panel liquid crystal element of the present invention, an optical laminate capable of preventing the clouding of the liquid crystal screen can be easily manufactured.

Sectional drawing which shows one Embodiment of the optical laminated body for the front surfaces of the in-cell touch-panel liquid crystal element of this invention. The top view which shows other embodiment of the optical laminated body for fronts of the in-cell touch-panel liquid crystal element of this invention. Sectional drawing which shows an example of the in-cell touch-panel 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 of producing an optical laminate]
The manufacturing method of the optical laminated body for the front surfaces of the in-cell touch-panel liquid crystal element of this invention includes the process of following (a)-(c).
(A) laminating an optical laminate forming member including a retardation plate and a polarizing film to form an optical laminate (b) forming a conductive layer on at least one member of the optical laminate forming member (c) A step of performing a grounding process from the surface of the conductive layer while the surface of the conductive layer is exposed

<Step (a)>
The step (a) is a step of laminating an optical laminate forming member including a retardation plate and a polarizing film.
As an optical laminated body formation member, a phase difference plate and a polarizing film are mentioned, Furthermore, the polarizing film protection base material used as needed, a surface protection base material, etc. are mentioned.
Such an optical laminate forming member can be laminated by bonding the respective members with an adhesive layer or the like. When a polyvinyl alcohol-based polarizing film (hereinafter sometimes referred to as "PVA-based polarizing film") is used as a polarizing film, water is attached to the PVA-based polarizing film to exhibit adhesion, thereby providing an additional adhesive layer. Even if it does not use, it can laminate.
As the adhesive layer, adhesives such as urethane type, acrylic type, polyester type, epoxy type, vinyl acetate type, polyvinyl chloride / vinyl acetate copolymer, and cellulose type can be used. The thickness of the adhesive layer is about 3 to 25 μm

The lamination order of the optical laminate is not particularly limited, but it is preferable to laminate so that the retardation plate is located on the surface of the optical laminate.
Moreover, when using a polarizing film protection base material in addition to a phase difference plate and a polarizing film as an optical layered product formation member, it is preferable to laminate so that a phase difference board, a polarizing film, and a polarizing film protection base material may become in order. .
In addition, when using a surface protection substrate in addition to a retardation plate and a polarizing film as an optical laminate formation member, laminating the optical laminate so that the retardation plate, the polarizing film, and the surface protection substrate are in this order. Is preferred. At this time, it is preferable to laminate the surface protection substrate so as to be located at the uppermost layer of the optical laminate. For example, when using a polarizing film protective substrate and a surface protective substrate in addition to a retardation plate and a polarizing film as an optical laminate forming member, a retardation plate, a polarizing film, a polarizing film protective substrate, a surface protective substrate Preferably, the surface protection substrate is placed on the top 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 touch-panel liquid crystal element side.
The detail of each member illustrated as an optical laminated body formation member is mentioned later.

<Step (b)>
The step (b) is a step of forming a conductive layer on at least one member of the optical laminate forming member. The conductive layer may be formed on one member of the optical laminate forming member, but may be formed on two or more members. Moreover, you may form a conductive layer in any surface side of an optical laminated body formation member. That is, the conductive layer may be formed at any position of the optical laminate.
Such a conductive layer has an alternative role to that of the touch panel which functions as a conductive member in the conventional external attachment type or on-cell type. When the conductive layer is positioned closer to the operator than the liquid crystal element, it is possible to prevent partial clouding of the liquid crystal screen due to static electricity when touched.

Specific positions for forming the conductive layer include, for example, the surface on the polarizing film side of the retardation plate, the surface on the opposite side to the polarizing film side of the retardation plate, the surface on the polarizing film side of the polarizing film protective substrate, polarization The surface on the opposite side to the polarizing film of a film protection base, the surface on the polarizing film side of a surface protection base, the surface on the opposite side to the polarizing film side of a surface protection base, etc. are mentioned.
The conductive layer is preferably formed to be located on the surface of the optical laminate, and in particular, is preferably formed to be located on the surface facing the in-cell touch panel liquid crystal element. By forming the conductive layer so as to be located on the surface of the optical laminate, step (c) described later can be performed after completion of step (a) and step (b). It can be prevented from being adversely affected. In particular, by forming the conductive layer so as to be positioned on the surface facing the in-cell touch panel liquid crystal element, the conductive layer is not exposed when the optical laminate is attached to the in-cell touch panel liquid crystal element. Long-term maintenance of
As described above, in order to form the conductive layer on the surface facing the in-cell touch panel liquid crystal element, after the conductive layer is formed on the retardation plate, the conductive layer is positioned on the surface. After laminating a means for laminating with another member (a polarizing film etc.), an optical laminate forming member including a retardation plate and a polarizing film so that the retardation plate is positioned on the surface, a conductive layer is formed on the retardation plate. The means to form can be mentioned.

  The timing of performing the step (b) differs depending on the position in the optical laminate of the member forming the conductive layer and on which side of the member the conductive layer is to be formed, before the step (a) In the middle of a), it can select suitably from among any timing after a process (a), and can determine.

  The conductive layer is formed by applying a conductive layer-forming composition to be described later onto the optical laminate-forming member, curing the composition as needed, or transferring the conductive layer formed on another member to the optical laminate-forming member And the like.

(Configuration of conductive layer)
The conductive layer has a role of releasing static electricity when touching and preventing whitening of the liquid crystal screen, but if it is released too much, the operation of the touch panel may be impaired if the in-cell touch panel is of a capacitive type. Therefore, the surface resistivity of the conductive layer is preferably 1.0 × 10 ^{8 to} 2.0 × 10 ⁹ Ω / □.

The conductive layer is formed of a conductive layer-forming composition containing a conductive agent, a binder resin composition which is optionally used, and a diluting solvent.
Examples of the conductive agent include ion conductive type conductive agents such as quaternary ammonium salts and lithium salts, electron conductive type conductive agents such as metal fine particles, metal oxide fine particles, carbon nanotubes, coating fine particles, and polyethylenedioxythiophene particles. Preferably, the conductive agent of the electronic conduction type which is less susceptible to humidity is used. Further, among the electron conduction type conductive agents, metal oxide fine particles are preferable from the viewpoint of long-term storage, heat resistance, moist heat resistance and light resistance.

It does not specifically limit as a metal which comprises a metal microparticle, For example, Au, Ag, Cu, Al, Fe, Ni, Pd, Pt etc. are mentioned.
The metal oxide constituting the metal oxide fine particles is not particularly limited, and, for example, tin oxide (SnO ₂ ), antimony oxide (Sb ₂ O ₅ ), antimony tin oxide (ATO), indium tin oxide (ITO) And aluminum zinc oxide (AZO), fluorinated tin oxide (FTO), ZnO and the like.
It does not specifically limit as a coating particle, For example, the conventionally well-known particle | grains of the structure by which the conductive coating layer was formed on the surface of core particle | grains are mentioned. 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 particles of fluorine resin fine particles, polymer fine particles such as acrylic resin particles and silicone resin particles, and fine particles of 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 type conductive agents are easily contacted in the conductive layer, so that the amount of the conductive agent added to provide sufficient conductivity can be suppressed, and by 40 nm or less 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 conduction type conductive agent is a value obtained by performing TEM observation, measuring the particle diameter of 10 electron conduction type conductive agents, and averaging the obtained values.

  The electron conduction type conductive agent is preferably linear or needle-like. The electron conduction type conductive agent having such a shape can reduce the fluctuation of the surface resistivity of the conductive layer even when the conductive layer is deformed (cured and shrunk or stretched due to temperature and humidity) to some extent.

The content of the electron-conductive conductive agent in the conductive layer is appropriately adjusted according to the type, shape, size, etc. of the electron-conductive conductive agent used, and for example, relative to 100 parts by mass of a binder resin described later And 100 to 300 parts by mass. By setting the amount 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. By setting the amount to 300 parts by mass or less, the surface resistivity of the conductive layer is 1.0 × It can easily be 10 ⁸ Ω / □ or more.
A more preferable lower limit of the content of the electron conduction type conductive agent is 150 parts by mass, and a more preferable upper limit is 250 parts by mass.

As a binder resin composition, a thermoplastic resin, a thermosetting resin composition, and an ionizing radiation curable resin composition can be mentioned, and these can be used in combination as appropriate. The binder resin composition may have adhesiveness, and in the case of having adhesiveness, it can be bonded to the in-cell touch panel liquid crystal element without separately forming an adhesive layer. Among binder resin compositions, thermoplastic resins are less likely to cause changes in surface resistivity due to deformation of the conductive layer (curing shrinkage or stretching due to temperature and humidity), and the surface resistivity of the conductive layer is stable over time. It is preferable at the point which can be provided.
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. One or a mixture of the thermosetting resin composition and the ionizing radiation curable resin composition may be used.

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

  As the conductive agent and binder resin of the first conductive layer, those described above can be used. 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. The average particle size and content of the electron conduction type conductive agent of the first conductive layer are preferably in the above-mentioned range.

The binder resin of the first conductive layer is preferably a thermoplastic resin. By using a thermoplastic resin, the change in surface resistivity due to the deformation (curing shrinkage or expansion and contraction due to temperature and humidity) of the first conductive layer can be less likely to occur, and the surface resistivity of the conductive layer is temporally stable. Is preferable in that it can be applied.
The thermoplastic resin preferably has no reactive functional group in the molecule. When a reactive functional group is contained in the molecule, the reactive functional group may react to cause curing shrinkage in the conductive layer, and the surface resistivity may be changed. The reactive group may be a functional group having an unsaturated double bond such as an acryloyl group or a vinyl group, a cyclic ether group such as an epoxy ring or an oxetane ring, a ring opening polymerization group such as a lactone ring, or an isocyanate forming urethane. And the like. These reactive functional groups may be contained as long as the conductive layer does not cause a change in surface resistivity due to curing shrinkage.

  The thermoplastic resin preferably has a side chain. In the thermoplastic resin having a side chain, the side chain acts as a steric hindrance, making it difficult to move in the conductive layer, and the temporal stability of the surface resistivity can be excellent. The side chains may have any structure, but preferably do not have the above-mentioned reactive functional groups in the molecule.

  The thermoplastic resin preferably has a glass transition temperature of 80 to 120 ° C. By setting the glass transition temperature to 80 ° C. or higher, it is possible to prevent the surface resistivity from becoming unstable due to the softness of the thermoplastic resin, and by setting the glass transition temperature to 120 ° C. or lower, the thermoplastic resin is hard. It is possible to prevent the decrease in adhesion with other members due to The more preferable lower limit of the glass transition temperature is 90 ° C., and the more preferable upper limit is 110 ° C.

  Specifically, polymethyl methacrylate is preferably used as the thermoplastic resin because it has the property of easily preventing the bleed out of the electron conduction type conductive agent.

The second conductive layer has a role of further flowing in the thickness direction the static electricity generated on the surface of the optical laminate that has reached the first conductive layer to enable grounding described later.
Therefore, while the first conductive layer has conductivity in the surface direction (X direction, Y direction) and thickness direction (z direction), 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 it is sufficient, and the conductivity in the surface direction is not necessarily required.

  The second conductive layer is preferably configured to include the conductive particles 121 (FIG. 4). The conductive fine particles have a role of achieving conductivity between the surface of the second conductive layer and the first conductive layer, and setting the second conductive layer to a predetermined surface resistivity. Such conductive fine particles are not particularly limited. For example, coated fine particles in which a conductive coating layer is formed on the surface of core fine particles are preferably used. As a material which comprises a coating particulate, the thing similar to the coating particulate of the conductive layer mentioned above can be used. From the viewpoint of improving the conduction from the first conductive layer, the conductive fine particles are preferably gold-plated fine particles.

The second conductive layer is preferably formed of a second conductive layer-forming composition containing conductive fine particles and a curable resin composition. When the composition for forming a second conductive layer contains a curable resin composition, the hardness deficiency of the first conductive layer can be compensated for by the second conductive layer, and the durability as the entire conductive layer is improved, and the surface resistivity The stability over time of the Further, the second conductive layer-forming composition further preferably contains a thermoplastic resin.
As the curable resin composition, a single or a mixture of a thermosetting resin composition and an ionizing radiation curable resin composition exemplified in the description of the cured layer of the surface protection substrate described later can be used.
The thermoplastic resin is preferably of the same type as the thermoplastic resin contained in the first conductive layer from the viewpoint of adhesion to the first conductive layer.
In addition, when using a curable resin composition and a thermoplastic resin together, it is preferable to make a thermoplastic resin into 10-70 mass parts with respect to 100 mass parts of curable resin compositions, and 20-60 mass parts. It is more preferable to do.

  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 making it 0.4 times or more, the conduction from the first conductive layer can be made favorable, and by making it 2.0 times or less, it is possible to prevent the conductive fine particles from coming off 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 the amount to 0.5 parts by mass or more, the conduction from the first conductive layer can be made favorable, and by setting the amount to 2.0 parts by mass or less, a decrease in film formability and hardness of the second conductive layer can be prevented. it can. The more preferable upper limit of the content of the conductive fine particles is 1.5 parts by mass.

As described above, since it is sufficient if the second conductive layer has conductivity in the thickness direction, and conductivity in the surface direction is not necessarily required, the resistivity specific to the second conductive layer is high. It is also good. However, the surface of the second conductive layer in a state in which the first conductive layer and the second conductive layer are laminated in order to improve the operability of the capacitive touch panel while effectively preventing the clouding of the liquid crystal screen. It is preferable that the surface resistivity measured by above is 1.0 * 10 < ⁸ > -2.0 * 10 < ⁹ > ohm / square.
Moreover, it is preferable in that case that the surface resistivity on a 1st conductive layer is 1.0 * 10 < ⁸ > -2.0 * 10 < ⁹ > ohm / square. If the surface resistivity of the first conductive layer is less than 1.0 × 10 ⁸ , even if the surface resistivity in the state in which 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. In addition, when the surface resistivity of the first conductive layer exceeds 2.0 × 10 ⁹ , the surface resistivity in the state in which the second conductive layer is laminated can not be set to 2.0 × 10 ⁹ or less, and thus the liquid crystal It becomes impossible to prevent the whitening of the screen effectively.

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 in the above range and the second conductive layer is more conductive than the first conductive layer from the viewpoint of the temporal stability of surface resistivity. It is preferable to increase the thickness of the layer. In addition, the ratio of [the thickness of the second conductive layer] / [the thickness of the first conductive layer] is preferably 1.5 to 50, more preferably 5 to 30, and 10 to 20. Is more preferred.
The thickness of the conductive layer is a value obtained by observing a cross section using an electron microscope (for example, SEM, TEM, STEM, etc.).

The conductive layer is formed by coating a composition for forming a conductive layer and a composition for forming a conductive layer comprising a solvent added as needed, on a retardation plate or a surface protection substrate, drying, and curing if necessary. It can be formed by The timing to form the conductive layer may be before or after laminating the optical laminate.
In the case where the conductive layer is formed of two layers, the second conductive layer is preferably formed closer to the in-cell touch panel liquid crystal element than the first conductive layer.

  The steps (a) and (b) are preferably performed by roll-to-roll. By performing both processes by roll-to-roll, productivity can be improved.

<Step (c)>
In the step (c), while the surface of the conductive layer is exposed, the surface of the conductive layer is grounded. By performing the grounding process, it is possible to prevent the clouding of the liquid crystal more effectively. In addition, by performing the grounding process in a state where the surface of the conductive layer is exposed, an effective and efficient grounding process can be performed.
In the case where the conductive layer has a two-layer structure of the first conductive layer and the second conductive layer described above, 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 relation to the step (a), depending on the position of the conductive layer in the optical laminate, before the step (a), the step (a) In the middle of the above, any timing after the step (a) can be appropriately selected and determined. For example, when the conductive layer is located on the surface of the optical laminate, any timing before the step (a), during the step (a) or after the step (a) may be used. Further, for example, when the conductive layer is positioned inside the optical laminate, the timing of performing the step (c) is preferably set to a timing before the step (a) or in the middle of the step (a).
In addition, it is preferable to perform a process (c) after processes (a) and (b) from a viewpoint of preventing that a grounding process receives a bad influence in a subsequent process.

The grounding process includes a method of connecting the surface of the conductive layer 1 to another conductive member 6 as shown in FIGS. Under the present circumstances, it is preferable that the surface of the conductive layer 1 and the other conductive member 6 are connected via the conducting wire 7. The conductive wire 7 is preferably fixed to the surface of the conductive layer 1 by a conductive adhesive material 8 such as silver paste, carbon tape, metal tape or the like.
The earthing treatment may be performed at one place or a plurality of places on the surface of the conductive layer 1. Further, the other conductive members 6 are places outside the effective area of the optical laminate 10 (outside the range in which the image can be viewed in the case of the in-cell touch panel liquid crystal display device) from the viewpoint of not affecting the optical characteristics. It is preferable to set it on the outer edge of the conductive layer 1 or outside the system of the optical laminate 10.
When the conductive layer 1 has a 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 be in contact with the conductive adhesive material to make the grounding process more effective, and the area is 1 cm ² or less By doing this, it is possible to make the ground portion invisible from the outside.

The other conductive member connected 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 grounding process more effective, 1.0 × 10 10 It is more preferably ³ Ωm or less, still more 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, alloys such as nichrome, and the like.

Between the steps (a) and (b) and the step (c), it is preferable to have a step of cutting the optical laminate into any 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 a position of the outermost surface of an optical laminated body. Furthermore, in this case, it is preferable to perform step (a) and step (b) by roll-to-roll. By taking such steps, the production can be made more efficient.
In order to position the conductive layer on the outermost surface of the optical laminate, first, an optical laminate is prepared, and a method of forming the conductive layer on the outermost surface of the obtained optical laminate, or located on the outermost surface of the optical laminate After forming a conductive layer on a member (a phase difference plate etc.), the method of laminating | stacking with another member so that this conductive layer may be outermost surface is mentioned.
In order to cut the optical laminate, conventionally known methods such as laser cutting, die cutting, and cutting can be used.

<Optical laminate forming member>
(Retardation plate)
The retardation plate is configured to have at least a retardation layer. Examples of the retardation layer include an aspect of an oriented film such as an oriented polycarbonate film, an oriented polyester film, an oriented cyclic olefin film, and an aspect of a layer containing a refractive index anisotropic material. In the former and latter embodiments, the latter embodiment is preferred from the viewpoint of retardation control and thinning.
A layer containing a refractive index anisotropic material (hereinafter sometimes referred to as “anisotropic material-containing layer”) may be different on the resin film even if the layer alone constitutes a retardation plate. It may be the composition which has a directionality material content layer.

As resin which constitutes a resin film, polyester resin, polyolefin resin, (meth) acrylic resin, polyurethane resin, polyether sulfone resin, polycarbonate resin, polysulfone resin, polyether resin, polyether A ketone resin, a (meth) acrylonitrile resin, a cycloolefin resin etc. are mentioned, 1 type or 2 types or more can be used among these. Among these, cycloolefin resins are preferable from the viewpoint of dimensional stability and optical stability.
Examples of the refractive index anisotropic material include rod-like compounds, discotic compounds and liquid crystal molecules.

When a refractive index anisotropic material is used, various types of retardation plates can be obtained depending on the orientation direction of the refractive index anisotropic material.
For example, the optical axis of the refractive index anisotropic material is directed to 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, So-called positive C plates are mentioned.
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 in the in-plane direction of the anisotropic material containing layer which is larger than the ordinary ray refractive index. It may be a so-called positive A plate.
Furthermore, by making the optical axis of the liquid crystal molecules parallel to the anisotropic material-containing layer and forming a cholesteric alignment in which the helical structure is taken in the normal direction, the entire anisotropic material-containing layer has a refractive index higher than that of ordinary rays. It may be a so-called negative C plate in which the small extraordinary ray refractive index is the normal direction of the retardation layer.
Furthermore, it is also possible to use a discotic liquid crystal having negative birefringence anisotropy as a negative A plate having an optical axis in the in-plane direction of the layer containing the anisotropic material.
Still 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, for example, by the method described in JP-A-2009-053371.

The retardation plate may be any one of the positive or negative C plate or A plate described above, or a hybrid orientation plate, but two or more of these may be used alone or in combination of two or more. It may consist of a plate of For example, when the liquid crystal element in 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, a combination of a positive C plate and a positive A plate or a biaxial plate It is preferable to use it, but any combination may be used as long as it can compensate for the viewing angle, and various combinations can be considered and can be selected appropriately.
When the retardation plate is composed of two or more plates, from the viewpoint of thinning, one plate is a stretched film, and the anisotropic material-containing layer (other plate) is laminated on the stretched film. Aspects are preferred.

  In the case of the structure which has an anisotropic material containing layer on a resin film, it is preferable to arrange | position a retardation film so that the resin film side may face the polarizing film side. By arranging in such a direction, the resin film of the retardation plate can be made to function as a back surface protection film of the polarizing film, and the thickness of the optical laminate can be reduced.

  15-80 micrometers is preferable and, as for the thickness of a phase difference plate, 20-60 micrometers is more preferable. When the retardation plate is composed of two or more plates, one plate is a stretched film, and the anisotropic material-containing layer (other plate) is laminated on the stretched film, It can be easily made within the above thickness range.

(Polarizing film)
The polarizing film is located between the retardation plate and the surface protective substrate.
The polarizing film may be any polarizing film having a function of transmitting only light having a specific vibration direction, for example, a PVA-based film obtained by stretching a PVA-based film or the like and dyeing it with iodine or a dichroic dye A polarizing film, a polyene-based polarizing film such as a dehydrated product of PVA or a dehydrochlorinated product of polyvinyl chloride, a reflective polarizing film using a cholesteric liquid crystal, a thin film crystal film-based polarizing film, etc. may be mentioned. Among them, preferred is a PVA-based polarizing film which exhibits adhesiveness with water and can bond a retardation plate or a surface protective substrate without separately providing an adhesive layer.

Examples of the PVA-based polarizing film include hydrophilic polymer films such as PVA-based films, partially-formalized polyvinyl alcohol-based films, and ethylene / vinyl acetate copolymer-based partially saponified films, iodine, dichroic dyes, and the like. What adsorb | sucks a color substance and uniaxially stretched is mentioned. Among these, from the viewpoint of adhesiveness, a polarizing film composed of a PVA-based film and a dichroic substance such as iodine is suitably used.
The PVA-based resin constituting the PVA-based film is obtained by saponifying polyvinyl acetate.

  2-50 micrometers is preferable and, as for the thickness of a polarizing film, 3-30 micrometers is more preferable.

(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 to the retardation plate. By providing a retardation plate on one surface of the polarizing film and the polarizing film protective base on the opposite surface, the number of members can be reduced.
As such a polarizing film protection base material, transparent plastic films, such as a triacetyl-cellulose film, an acrylic resin film, a polycarbonate film, a cyclic olefin film, a polyester film, are mentioned. In addition, the visibility at the time of observing through polarization sunglasses can be made favorable by using an optical anisotropic base material such as a plastic film having a retardation value of 3000 to 30000 nm or a plastic film having a quarter wavelength retardation as a transparent plastic film. It is suitable in point. Note that good visibility through polarized sunglasses means that when the optical laminate is disposed on the front of the liquid crystal display element, unevenness in different colors (hereinafter also referred to as “niji unevenness”) is not observed on the display screen. .
4-500 micrometers is preferable and, as for the thickness of a polarizing film protection base material, 4-250 micrometers is more preferable.

(Surface protection substrate)
The surface protection 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), imparts stiffness to the optical laminate, and It has a role of protecting the surface of the laminate. In addition, the protective function of a polarizing film can also be fulfilled by using a surface protection film in contact with a polarizing film.
As a surface protection base material, a cover glass, a plastic plate, a laminated plastic film etc. are mentioned. Among these, laminated plastic films suitable for roll-to-roll production are preferable.
A conventionally well-known thing can be used for a cover glass, 0.3-1.0 mm of thickness is preferable, and 0.3-0.7 mm is more preferable.
A conventionally well-known thing can be used for a plastic board, 0.3-2.0 mm is preferable and 0.3-1.0 mm of thickness is more preferable.
The laminated plastic film has a cured layer formed of a curable resin composition such as a thermosetting resin composition or an ionizing radiation curable resin composition on one side or both sides of a transparent plastic film such as a polyester film. What laminated | stacked multiple sheets of transparent plastic films, such as a polyester film, through an adhesive layer, etc. are mentioned. 60-250 micrometers is preferable and, as for the thickness of a lamination | stacking plastic film, 60-150 micrometers is more preferable. In addition, when using an optical anisotropic base 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 constituting the laminated plastic film, observation through polarized sunglasses It is suitable at the point which can prevent rainbow unevenness.

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

  As the ionizing radiation curable resin composition, a photopolymerizable prepolymer which can be cross-linked and cured by irradiation of ionizing radiation (ultraviolet light or electron beam) can be used. As this photopolymerizable prepolymer, one molecule is contained. In particular, (meth) acrylic prepolymers having two or more (meth) acryloyl groups and having a three-dimensional network structure by crosslinking and curing are particularly preferably used. As this (meth) acrylic prepolymer, urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, melamine (meth) acrylate, polyfluoroalkyl (meth) acrylate, silicone (meth) acrylate, etc. Acrylic prepolymers that can be used and have excellent reactivity are preferred. Although these (meth) acrylic prepolymers can be used alone, it is preferable to add a photopolymerizable monomer in order to improve the crosslinking curability and to further improve the hardness of the cured layer.

  Examples of photopolymerizable monomers include monofunctional acrylic monomers such as 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate and 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, hydroxypivalic ester neopentyl glycol di (meth) acrylate (Meth) acrylic mono, such as dipentaerythritol hexa (meth) acrylate, trimethylpropane tri (meth) acrylate and pentaerythritol tri (meth) acrylate Is used one or more types of chromatography such, it is preferable to use a polyfunctional acrylic monomer.

When the ionizing radiation-curable resin composition is cured by irradiation with ultraviolet light, in addition to the photopolymerizable prepolymer and the photopolymerizable monomer, it is preferable to use an additive such as a photopolymerization initiator or a photopolymerization accelerator.
Examples of the photopolymerization initiator include acetophenone, benzophenone, Michler's ketone, benzoin, benzyl methyl ketal, benzoylbenzoate, α-acyloxime ester, thioxanthones and the like.
Further, the photopolymerization accelerator is capable of alleviating polymerization problems due to air at the time of curing and accelerating the curing rate. For example, p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester and the like can give.
In addition, the ionizing radiation curing 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 step (a) or at the stage of the cutting step described above. A semi-cured state of the cured layer is preferable in that the optical laminate can be easily cut. When the laminated plastic film is of a type having a cured layer formed of a thermosetting resin composition or an ionizing radiation curable resin composition on one side or both sides of a transparent plastic film, the cured layer is semi-cured The state is preferable in that the adhesion between the cured layer and another member (for example, a polarizing film) can be improved.

  A functional layer may be provided on the surface to be the surface of the optical laminate of the surface protection 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 antireflective layer, an antiglare layer, a fingerprint resistant layer, an antifouling layer, an abrasion resistant layer, an antibacterial layer and the like. In addition, those functional layers are preferably formed of a thermosetting resin composition or an ionizing radiation curable resin composition, and more preferably formed of an ionizing radiation curable resin composition.

<In-cell touch panel liquid crystal element>
The in-cell touch panel liquid crystal element has a touch panel function such as a resistance film type, an electrostatic capacity type, or an optical type incorporated in a liquid crystal element formed by sandwiching a liquid crystal between two glass substrates. In addition, as a display method of the liquid crystal of an in-cell touch-panel liquid crystal element, an IPS system, VA system, a multi-domain system, OCB system, STN system, TSTN system etc. are mentioned.
The in-cell touch panel liquid crystal element is described in, for example, JP-A-2011-76602 and JP-A-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 comprises 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 step of bonding together.
The in-cell touch panel liquid crystal element and the optical laminate can be bonded, for example, via an adhesive layer.
As the adhesive layer, adhesives such as urethane type, acrylic type, polyester type, epoxy type, vinyl acetate type, polyvinyl chloride / vinyl acetate copolymer, and cellulose type 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 device]
The optical laminate for the front surface of the in-cell touch panel liquid crystal display device of the present invention (hereinafter referred to as "the 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 laminate forming member, and the surface of the conductive layer is subjected to grounding treatment.
The embodiment of the constituent features of the optical laminate of the present invention is as described above.

[In-cell touch panel liquid crystal display device]
The in-cell touch panel liquid crystal display device of the present invention is obtained by bonding the retardation film side of the above-described optical laminate of the present invention and the in-cell touch panel liquid crystal element side.
The constituent 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 The present invention will next be described in more detail by way of examples, which should not be construed as limiting the invention thereto.

<Composition of adhesive layer>
As an adhesive layer used in the examples, an adhesive comprising 100 parts of an acrylic adhesive (Oribine BPS1109 manufactured by Toyo Ink Mfg. Co., Ltd.), 2.5 parts of a curing agent (Oribine BHS 8515 manufactured by Toyo Ink Mfg. Co., Ltd.) and a dilution solvent What was formed by coating and drying the layer A coating liquid was used.

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

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

<Fabrication of Polarizing Film>
A polyvinyl alcohol film having a thickness of 80 μm was stretched up to 3 times while being stained for 1 minute in a 0.3% iodine solution at 30 ° C. between rolls with different speed ratios. Thereafter, the film was stretched to a total draw ratio of 6 times while being immersed for 0.5 minutes in an aqueous solution containing 60% of boric acid at 4% concentration and potassium iodide at 10% concentration. Subsequently, after washing | cleaning by immersing in 30 degreeC and the aqueous solution containing 1.5% density | concentration potassium iodide for 10 seconds, it dried at 50 degreeC for 4 minutes, and obtained the 20-micrometer-thick polarizing film.

<Measurement of physical properties of optical laminate and evaluation>
The physical property measurement and evaluation of the optical laminated body of an Example and a comparative example were performed as follows. The results are shown in Table 1.
[Surface resistivity]
The surface resistivity (Ω / □) of the conductive layer immediately after the production of the optical laminate was measured based on JIS K6911. Using high resistivity meter HiLester UP MCP-HT450 (made by Mitsubishi Chemical Corporation) and using URS probe MCP-HTP14 (made by Mitsubishi Chemical Corporation) as the probe, under an environment of temperature 25 ± 4 ° C and humidity 50 ± 10% The surface resistivity (Ω / □) was measured at an applied voltage of 500 V.
When the conductive layer had a two-layer structure, the surface resistivity on the second conductive layer was measured.
[Temporal stability of surface resistivity]
The surface resistivity (Ω / □) of the conductive layer after holding the optical laminate at 80 ° C. for 100 hours is measured, and (the surface resistivity after holding at 80 ° C. for 100 hours) / (the surface resistivity immediately after production) The ratio was calculated. In addition, the surface of the conductive layer of the optical laminate is rubbed back and forth 10 times (stroke 100 mm) with steel wool (No. 0000) with a load of 100 g to visually confirm whether a scratch mark is visible on the surface of the conductive layer. did. As a result, when the ratio is 0.5 or more and less than 3 and a scratch mark is not observed is "◎", and when the ratio is 0.5 or more but less than 3 but a scratch mark is observed "O". .
[Whiteness of LCD Screen]
The optical laminates of Examples and Comparative Examples were bonded onto the in-cell touch panel liquid crystal element via an adhesive layer with a thickness of 20 μm. Then, a protective film (a known protective film such as a polyethylene protective film or a PET protective film) was further bonded on the outermost surface of the optical laminate. Then, the protective film attached was removed, and immediately after driving the liquid crystal display device, when it was touched by hand, it was visually evaluated whether the white turbidity phenomenon occurred.
○: No white turbidity is visible. Δ: A slight white turbidity may be visible, but extremely microscopic ×: White turbidity is noticeable and visible [Niji Mura]
The optical laminates of Examples and Comparative Examples are bonded to an in-cell touch panel liquid crystal element through an adhesive layer with a thickness of 20 μm, and the screen is displayed white or substantially white, through commercially available polarizing sunglasses or polarizing plates It was evaluated whether or not rainbow unevenness (rainbow pattern) could be visually recognized from various angles.
○: The rainbow pattern is not visible ×: The rainbow pattern is viewed [operability]
The optical laminates of Examples and Comparative Examples were bonded onto the in-cell touch panel liquid crystal element via an adhesive layer with a thickness of 20 μm. Then, when the top surface of the optical laminate was touched by hand, it was visually evaluated whether the liquid crystal and touch sensor were driven without any problems.
○: Driving without problems Δ: A slight malfunction may be seen, but driving ×: Does not operate

Example 1
(1) Preparation of surface protective substrate [Preparation of coating solution for hardened layer on outermost surface]
Pentaerythritol triacrylate (manufactured by Nippon Kayaku Co., Ltd., PET-30), polymer-containing acrylate resin (manufactured by Arakawa Chemical Co., Ltd., beam set DK-1), and silica fine particle dispersion (manufactured by JSR Co., Ltd., KZ6406) The solution was added to methyl isobutyl ketone and stirred so that the solid contents of the three components became 50 parts, 25 parts and 25 parts in order, to obtain a solution a.
Next, 7 parts by mass of a photopolymerization initiator (manufactured by BASF Japan, Irgacure 184) and 1.5 parts by mass of a photopolymerization initiator (manufactured by BASF Japan, Lucirin TPO) are added to 100 parts of the solid content of the solution a. The solution was stirred and dissolved to prepare a solution b having a final solid content of 40% by mass.
Then, 0.4 parts of a leveling agent (product name Megafac RS71, manufactured by DIC) in solid content ratio is added to 100 parts of solid content of solution b and stirred to prepare a composition for the outermost layer did.
[Adjustment of coating solution for hardening layer on back side]
Pentaerythritol triacrylate (manufactured by Nippon Kayaku Co., Ltd., PET-30), polymer-containing acrylate resin (manufactured by Arakawa Chemical Co., Ltd., beam set DK-1), and silica fine particle dispersion (manufactured by JSR Co., Ltd., KZ6406) The mixture was added to methyl isobutyl ketone and stirred so that the solid contents of the three components became 50 parts, 25 parts and 25 parts in order, to obtain a solution c.
Next, 4 parts by mass of a photopolymerization initiator (manufactured by BASF Japan Ltd., Irgacure 184) is added to 100 parts of the solid content of solution c, and the mixture is stirred and dissolved to obtain solution d having a final solid content of 40% by mass. Prepared.
Subsequently, the solid content of the two components is 100 parts of the solid content of the solution d with a leveling agent (manufactured by DIC, Megafac MCF 350-5) and an antiblocking agent (manufactured by CIK Nanotech, SIRMIBK 15WT% -E65) 0.1 parts and 1.5 parts were sequentially added and stirred to prepare a composition for a back layer.
[Formation of hardened layer]
First, the composition for the outermost surface curing layer on a 5.7 μm thick biaxially stretched polyester film (Lumirror 5N88 manufactured by Toray Industries, Inc., approximately 1⁄4 wavelength retardation film having a wavelength of 589.3 nm and a retardation of 134.0 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 the coating film was cured by irradiation of ultraviolet rays with an ultraviolet irradiation amount of 240 mJ / cm ² to form a cured layer. Subsequently, the composition for a back surface-use cured layer was applied on the reverse surface by slit reverse coating so as to give a film thickness of 50 μm after drying, to form a coated film. The obtained coating film was dried at 70 ° C. for 1 minute, and then irradiated with ultraviolet light with 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 Chemical Co., Ltd. V3560 (ATO dispersion, ATO average particle diameter 8 nm) is added and stirred to adjust the final solid content to 8 mass%, and the ratio of the thermoplastic resin: ATO to 100: 200 (mass ratio), The composition for layers was obtained.
Next, the composition for a conductive layer was applied onto the retardation film by slit reverse coating so that the dry coating thickness would be 0.3 μm, and a conductive layer was formed.

(3) Preparation of Optical Laminate With the conductive layer-provided retardation film, the polarizing film, and the surface protective substrate prepared above, the conductive layer is attached to one side of the polarizing film while water is sprayed onto the polarizing film. The retardation film was bonded to the other surface with a surface protective substrate to obtain an optical laminate. At the time of bonding, the back side cured layer side of the surface protection 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 silver paste is used to fix the conducting wire at one position on the outer edge portion of the surface of the conductive layer of the obtained optical laminate, and the conducting wire is made of a conductive member (nichrome, volume resistivity 1.5 × 10 ⁻⁶ Ωm Connected to). The area of the fixing point was 2 mm ² .

Example 2
An optical laminate was produced in the same manner as in Example 1 except that a second conductive layer was formed on the conductive layer (first conductive layer) of Example 1 by the following method.
(Formation of second conductive layer)
Methyl ethyl ketone (MEK) such that pentaerythritol triacrylate (PETA) and HRAG acrylic (25) MIBK (thermoplastic resin) manufactured by DNP Fine Chemical Co., Ltd. become 70 parts and 30 parts of solid content of the two components in order The mixture was added to a mixed solvent of / isopropanol (IPA), stirred and dissolved to obtain a solution e.
Then, 4 parts by mass of a photopolymerization initiator (manufactured by BASF Japan Ltd., Irgacure 184) and 0 parts of a leveling agent (manufactured by Dainichi Seika Kogyo Co., Ltd., 10-301 (TL)) relative to 100 parts of the solid content of solution e .2 parts were added and stirred to prepare solution f.
Then, to 100 parts by mass of the resin component of solution f, 0.83 parts by mass of conductive fine particle dispersion (Bright dispersion made by DNP Fine Chemical, average particle diameter of conductive fine particles 4.6 μm, solid content 25%) is added Stir and finally add an ultraviolet light absorber (BASF Japan, TINUVI 477) to 6 parts relative to 100 parts of the solid content of solution f and stir for a second conductive layer with a total solid content of 25%. The composition was obtained.
The composition for a second conductive layer was applied on the conductive layer (first conductive layer) previously formed by slit reverse coating to a dry coating amount of 6 g / m ² to form a coating film. The obtained coating film is dried at 70 ° C. for 1 minute, and then the coating film is cured by irradiating ultraviolet rays with 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. The

[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 to a dry coating amount of 4 g / m ² and a thickness of 3 μm. Obtained.

Example 4
An optical laminate is 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 in Example 1 is changed to 100: 400 and the dry coating thickness is changed to 1 μm. The

[Example 5]
An optical laminate was obtained in the same manner as in Example 2 except that the second conductive layer in 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 in Example 2 was changed to a dry coating amount of 13 g / m ² and a thickness of 12 μm.

Comparative Example 1
Optical lamination in the same manner as in Example 1 except that the conductive film was not formed, and the 5.7 μm thick polyester film was changed to a 23 μm thick non-optical anisotropic polyester film (Mitsubishi Resins Co., Ltd., T600E25N). The body was made.
Comparative Example 2
An optical laminate was prepared in the same manner as Example 1, except that the conductive film was not formed, and the 5.7 μm thick polyester film was changed to a 25 μm thick triacetyl cellulose film (KC2UASW manufactured by Konica Minolta). did.

As is clear from Table 1, the optical laminates of Examples 1 to 6 were capable of preventing uneven unevenness and clouding of liquid crystals, and were excellent in the temporal stability of the surface resistivity and the operability of the in-cell touch panel. Moreover, since the manufacturing method of the optical laminated body of Examples 1-6 performs a grounding process in the state which exposed the conductive layer, it was able to 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 / sq. And the operability was excellent.

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

Claims (17)

The following conductive layer is a two-layer structure of a first conductive layer and a second conductive layer including the following steps (a) to (c),
The first conductive layer is formed of a first conductive layer-forming composition containing an electron conductive conductive agent and a thermoplastic resin, and the second conductive layer is a conductive fine particle, a curable resin composition, and a thermoplastic resin Ri Na is formed from a second conductive layer forming composition comprising,
The electron conduction type conductive agent is metal oxide fine particles,
The conductive fine particles are coated fine particles in which a conductive coating layer made of metal or alloy is formed on the surface of the core fine particles,
The curable resin composition, Ru alone or a mixture der thermosetting resin composition or ionizing radiation curable resin composition, method of producing an optical laminate for the front of the in-cell touch panel LCD device.
(A) laminating an optical laminate forming member including a retardation plate and a polarizing film to form an optical laminate (b) forming a conductive layer on at least one member of the optical laminate forming member (c) A step of performing a grounding process from the surface of the conductive layer while the surface of the conductive layer is exposed Wherein in the step (b), wherein the said surface located on the side of the polarizing film of the retardation plate to form the conductive layer on the opposite surface, optical stack for the front of the in-cell touch panel LCD device according to claim 1, wherein How to make the body. The includes an optical stack forming member surface protection substrate, in the step (a), the said retarder, the polarizing film and the surface protective substrate so in this order, and the surface protective substrate top The manufacturing method of the optical laminated body for fronts of the in-cell touch-panel liquid crystal element of Claim 1 or 2 laminated | stacked so that it may become an upper layer. 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 surface resistivity of the conductive layer is 1.0 × 10 ^{8 to} 2.0 × 10 ⁹ Ω / □. Manufacturing method. The method of manufacturing an optical laminate for a front surface of an in-cell touch panel liquid crystal element according to any one of claims 1 to 4, wherein the second conductive layer is closer to the in-cell touch panel liquid crystal element than the first conductive layer .   The manufacturing method of the optical laminated body for fronts of the in-cell touch-panel liquid crystal element in any one of Claims 1-5 which perform the process of producing the laminated body of the said process (a) by roll-to-roll. The steps (a) and (b) are carried out so that the conductive layer is at the position of the outermost surface of the optical laminate, and the optical laminate at this stage is cut into an arbitrary size, The manufacturing method of the optical laminated body for fronts of the in-cell touch-panel liquid crystal element in any one of Claims 1-6 which performs c).   The manufacturing method of the optical laminated body for fronts of the in-cell touch panel liquid crystal element in any one of Claims 1-7 whose said in-cell touch panel liquid crystal element is an electrostatic capacitance type in-cell touch panel liquid crystal element. The method for producing an optical laminate for the front surface of an in-cell touch panel liquid crystal element according to any one of claims 1 to 8 , wherein the thermoplastic resin in the second conductive layer is the same as the thermoplastic resin in the first conductive layer. .   The manufacturing method of the optical laminated body for fronts of the in-cell touch-panel liquid crystal element of Claim 9 in which the said thermoplastic resin does not have a reactive functional group in a molecule | numerator. Than the polarizing film of the obtained optical laminate manufacturing method according to any one of claims 1 to 10 carried out and the phase difference plate side, a step of bonding the in-cell touch panel LCD device, in-cell touch panel liquid crystal display device Manufacturing method. An optical laminate forming member including a retardation plate and a polarizing film is laminated, a conductive layer is formed on at least one member of the optical laminate forming member, and a surface of the conductive layer is grounded And the conductive layer is a two-layer structure of a first conductive layer and a second conductive layer,
The first conductive layer is made is formed from a first conductive layer forming composition comprising electron conductive type conductive agent and a thermoplastic resin, the second conductive layer, conductive fine particles, curable resin composition and a thermoplastic resin is formed from the second conductive layer forming composition comprising a result, the
The electron conduction type conductive agent is metal oxide fine particles,
The conductive fine particles are coated fine particles in which a conductive coating layer made of metal or alloy is formed on the surface of the core fine particles,
The optical laminate for the front surface of an in-cell touch panel liquid crystal element, wherein the curable resin composition is a thermosetting resin composition or an ionizing radiation curable resin composition alone or as a mixture thereof . The optical laminated body for fronts of the in-cell touch-panel liquid crystal element of Claim 12 whose surface resistivity of the said conductive layer is 1.0 * 10 < ⁸ > -2.0 * 10 < ⁹ > ohm / square. The optical laminated body for fronts of the in-cell touch panel liquid crystal element according to claim 12 or 13, wherein the second conductive layer is closer to the in-cell touch panel liquid crystal element than the first conductive layer . The optical laminate for the front surface of the in-cell touch panel liquid crystal element according to any one of claims 12 to 14 , wherein the thermoplastic resin in the second conductive layer is the same as the thermoplastic resin in the first conductive layer .   The optical laminate for the front surface of an in-cell touch panel liquid crystal element according to claim 15, wherein the thermoplastic resin has no reactive functional group in its molecule. And the phase difference plate side than the polarizing film of the laminated body for optical purposes according to any one of claims 12 to 16, comprising the stuck and in-cell touch panel LCD device, in-cell touch panel liquid crystal display device.