KR102725075B1 - Liquid crystal panel and liquid crystal display device - Google Patents

Abstract

The present invention is a liquid crystal panel (C) having a polarizing film (A) having an adhesive layer arranged through a first adhesive layer (2) without a conductive layer on the viewing side of a liquid crystal cell (B), and further having a conductive structure (51) on its side surface, wherein the polarizing film having the adhesive layer has a first polarizing film (1), an anchor layer (3), and a first adhesive layer in this order, the first polarizing film contains a polarizer having an iodine concentration of 6 wt% or less, the anchor layer contains a conductive polymer, and the first adhesive layer contains a (meth)acrylic polymer and an antistatic agent, and the conductive structure is provided at least at a point on the side surface at which, when a dimensional shrinkage test of the polarizing film having the adhesive layer is performed in an environment of 105°C and 500 hours, the amount of dimensional change in the film plane direction of the polarizing film having the adhesive layer is 400 μm or less. The liquid crystal panel of the present invention has excellent antistatic function and can also satisfy conductivity reliability and durability in a high temperature range.

Description

Liquid crystal panel and liquid crystal display device

The present invention relates to a liquid crystal panel having a liquid crystal cell and a polarizing film having a predetermined adhesive layer on the viewing side of the liquid crystal cell. In addition, the present invention relates to a liquid crystal display device using the liquid crystal panel. The liquid crystal display device using the liquid crystal panel of the present invention can be used together with an input device such as a touch panel applied on the viewing side of the liquid crystal display device, and can also be used as various input display devices as a liquid crystal display device having a touch sensing function.

Liquid crystal display devices generally have polarizing films bonded to both sides of a liquid crystal cell via an adhesive layer from their image formation method. In addition, it has become practical to mount a touch panel on the display screen of a liquid crystal display device. There are various types of touch panels, such as electrostatic capacitance type, resistive film type, optical type, ultrasonic type, or electromagnetic induction type, but electrostatic capacitance type is widely used. In recent years, liquid crystal display devices with a touch sensing function that have a built-in electrostatic capacitance sensor as a touch sensor section have been used.

Meanwhile, when manufacturing a liquid crystal display, when attaching a polarizing film having the adhesive layer to a liquid crystal cell, a release film is peeled from the adhesive layer of the polarizing film having the adhesive layer, but static electricity is generated by the peeling of the release film. In addition, static electricity is also generated when peeling the surface protection film of the polarizing film attached to the liquid crystal cell or when peeling the surface protection film of the cover window. The static electricity generated in this way affects the orientation of the liquid crystal layer inside the liquid crystal display, resulting in defects. The generation of static electricity can be suppressed, for example, by forming an antistatic layer on the outer surface of the polarizing film.

Meanwhile, in a liquid crystal display device having a touch sensing function, a capacitance sensor detects a weak capacitance formed by a transparent electrode pattern and a finger when a user's finger approaches the surface. When a conductive layer such as an antistatic layer is provided between the transparent electrode pattern and the user's finger, the electric field between the driving electrode and the sensor electrode is disturbed, the sensor electrode capacitance becomes unstable, the touch panel sensitivity decreases, and this causes a malfunction. In a liquid crystal display device having a touch sensing function, it is required to suppress the generation of static electricity and the malfunction of the capacitance sensor. For example, in order to solve the above problem, in a liquid crystal display device having a touch sensing function, it has been proposed to place a polarizing film having an antistatic layer having a surface resistance value of 1.0×10 ⁹ to 1.0×10 ¹¹ Ω/□ on the viewing side of the liquid crystal layer in order to reduce the occurrence of display defects or malfunctions (Patent Document 1). In addition, it has been proposed to place a polarizing film on the side of the reader through an adhesive layer containing an antistatic agent and an anchor layer containing a conductive polymer (Patent Documents 2 and 3).

Japanese Patent Publication No. 2013-105154 Japanese Patent Publication No. 2017-068022 Japanese Patent Publication No. 2011-528448

According to the polarizing film having the antistatic layer described in Patent Document 1, static electricity generation can be suppressed to a certain extent. However, in Patent Document 1, since the arrangement location of the antistatic layer is farther away from the fundamental location where static electricity is generated, it is not effective compared to the case where the antistatic function is imparted to the adhesive layer. In addition, in a liquid crystal display device having a touch sensing function, conductivity from the side can be imparted by providing a conductive structure on the side of the polarizing film, but when the antistatic layer is thin, the contact area with the conductive structure on the side is small, so sufficient conductivity is not obtained and a conductive failure occurs. On the other hand, it was found that when the antistatic layer becomes thick, the touch sensor sensitivity decreases. In addition, it was found that the antistatic layer provided on the outer surface of the polarizing film does not obtain sufficient conductivity due to poor adhesion with the conductive structure provided on the side in a humidified or heated environment (after a humidified or heated reliability test), so a conductive failure occurs.

Meanwhile, also, according to the liquid crystal panel using the polarizing film having the conductive adhesive layer, etc. described in Patent Documents 2 and 3, static electricity unevenness can be suppressed compared to Patent Document 1. In particular, in the liquid crystal panel of the aspect in which the polarizing film having the adhesive layer is arranged on the viewing side of the liquid crystal cell without passing through the conductive layer, high conductivity is required. However, when the liquid crystal panel is applied to a liquid crystal display device for vehicle-mounted use, it is exposed to a higher temperature environment than when applied to a general television or mobile phone, etc., so conductive properties in a high-temperature range are required, and even the liquid crystal panels described in Patent Documents 2 and 3 could not satisfy the conductive properties in a high-temperature range. In addition, durability in a high-temperature range is required in the liquid crystal display device for vehicle-mounted use.

The present invention provides a liquid crystal panel having a polarizing film having a liquid crystal cell and an adhesive layer applied to the viewing side thereof, and an object of the present invention is to provide a liquid crystal panel having a good antistatic function and also being able to satisfy conductivity reliability and durability in a high temperature range.

In addition, the present invention aims to provide a liquid crystal display device using the liquid crystal panel.

As a result of repeated examinations to solve the above-mentioned problem, the inventors of the present invention found that the above-mentioned problem can be solved by the following liquid crystal panel, thereby completing the present invention.

That is, the present invention comprises a liquid crystal cell having a liquid crystal layer including liquid crystal molecules homogeneously aligned in the absence of an electric field, a first transparent substrate and a second transparent substrate that sandwich and support the liquid crystal layer on both sides,

A liquid crystal panel having a polarizing film having an adhesive layer arranged through a first adhesive layer without a conductive layer on the side of the first transparent substrate on the viewing side of the liquid crystal cell, and further having a conductive structure on the side of the polarizing film having the adhesive layer.

A polarizing film having the adhesive layer has a first polarizing film, an anchor layer, and a first adhesive layer in this order,

The above first polarizing film contains a polarizer having an iodine concentration of 6 wt% or less,

The above anchor layer contains a conductive polymer,

The first adhesive layer is formed of an adhesive composition containing a (meth)acrylic polymer (A) and an antistatic agent (B).

The above-mentioned conductive structure relates to a liquid crystal panel, characterized in that, when a dimensional shrinkage test of a polarizing film having the adhesive layer is performed in an environment of 105°C and 500 hours, the dimensional change in the film plane direction of the polarizing film having the adhesive layer is at least provided at a point b on the side surface where the amount of dimensional change is 400 ㎛ or less.

In the above liquid crystal panel, it is preferable that the dimensional change of the point b where the conductive structure is provided is 250 μm or less.

In the above liquid crystal panel, it is preferable that the anchor layer has a thickness of 0.01 to 0.5 ㎛ and a surface resistance value of 1×10 ⁶ to 1×10 ⁹ Ω/□.

In the above liquid crystal panel, it is preferable that the first adhesive layer has a thickness of 1 to 100 ㎛ and a surface resistance value of 1×10 ⁸ to 1×10 ¹² Ω/□.

In the above liquid crystal panel, the first polarizing film may use a double-sided protective polarizing film having a polarizer and protective films on both sides of the polarizer.

In the above liquid crystal panel, it is preferable that the polarizer contained in the first polarizing film has a thickness of more than 10 μm.

In the above-mentioned in-cell type liquid crystal panel, as the liquid crystal cell, an in-cell type liquid crystal cell having a touch sensing electrode portion according to the function of a touch sensor and touch driving between the first transparent substrate and the second transparent substrate can be used.

In the above liquid crystal panel, a second polarizing film may be disposed on the side of the second transparent substrate of the liquid crystal cell through a second adhesive layer.

The present invention also relates to a liquid crystal display device having the liquid crystal panel.

In the liquid crystal panel of the present invention, a polarizing film having an adhesive layer on the viewing side is provided with an adhesive layer containing an antistatic agent through an anchor layer containing a conductive polymer on the polarizing film, and antistatic performance can be improved by these two layers, and further, the polarizing film having the adhesive layer is in contact with a conductive structure from the side. Therefore, even when a polarizing film having an adhesive layer is provided on the viewing side of the liquid crystal cell without passing through a conductive layer, conductivity from the side of the polarizing film having the adhesive layer is secured, and occurrence of static electricity unevenness due to poor conductivity can be suppressed.

As described above, although the conductive properties can be improved in both layers of the anchor layer and the adhesive layer, it was found that the heat shrinkage of the polarizing film becomes significant in a high temperature environment (especially, exceeding 100°C), so that the conductive paste forming the conductive structure is easily short-circuited and conductive failure occurs. In addition, since the heat shrinkage of the polarizing film can be controlled to a small extent by using a thin polarizer, the effect of the short-circuiting can be reduced, but when the polarizer becomes thin, the iodine concentration per thickness tends to increase, and since the iodine concentration is high among thin polarizers, when a thin polarizer is used, polyenization of the polarizer is easily caused in a high temperature environment (especially, exceeding 100°C), so that the optical properties were not sufficient.

In the present invention, a polarizing film is used that contains a polarizer having an iodine concentration of 6 wt% or less, and further, a conductive structure is provided by selecting a portion with small heat shrinkage (i.e., a dimensional change of 400 µm or less) on the side surface of the polarizing film having an adhesive layer, thereby satisfying conductive reliability and durability in a high-temperature range (particularly, exceeding 100°C).

Fig. 1 is a cross-sectional view showing an example of a polarizing film having an adhesive layer used on the viewing side of a liquid crystal panel of the present invention.
FIG. 2 is an example of a conceptual diagram viewed from a plane for explaining the state of dimensional change before and after shrinkage in the film plane direction of a polarizing film having an adhesive layer used on the viewing side of a liquid crystal panel of the present invention.
Fig. 3 is a cross-sectional view showing an example of a liquid crystal panel of the present invention.
Fig. 4 is a cross-sectional view showing an example of an in-cell type liquid crystal panel of the present invention.
Fig. 5 is a cross-sectional view showing an example of an in-cell type liquid crystal panel of the present invention.
Fig. 6 is a cross-sectional view showing an example of an in-cell type liquid crystal panel of the present invention.
Fig. 7 is a cross-sectional view showing an example of an in-cell type liquid crystal panel of the present invention.
Fig. 8 is a cross-sectional view showing an example of an in-cell type liquid crystal panel of the present invention.
Figure 9 is a calibration curve created when calculating the iodine concentration of a polarizer.

Hereinafter, the present invention will be described with reference to the drawings. A polarizing film A having an adhesive layer used on the viewing side of a liquid crystal panel of the present invention has a first polarizing film (1), an anchor layer (3), and a first adhesive layer (2) in this order. In addition, the polarizing film A having an adhesive layer may have a surface treatment layer (4) on the viewing side of the first polarizing film (1). Fig. 1 exemplifies a case in which a surface treatment layer (4), a first polarizing film (1), an anchor layer (3), and a first adhesive layer (2) are provided in this order. In addition, although not described in Fig. 1, a separator may be provided on the first adhesive layer (2) of the polarizing film A having an adhesive layer of the present invention, and a surface protection film may be provided on the surface treatment layer (4).

In addition, the first polarizing film (1) is used having a protective film on one or both sides of the polarizer, but from the viewpoint of optical durability, it is preferable to use a double-protection polarizing film having a protective film on both sides rather than a single-protection polarizing film having a protective film on only one side of the polarizer (no drawing).

Fig. 2 is an example of a conceptual diagram viewed from a plane showing the state of dimensional change before and after shrinkage in the film plane direction before and after immersion when a polarizing film A having the adhesive layer is immersed in an environment of 105°C for 500 hours and a dimensional shrinkage test is performed. In Fig. 2, the polarizing film A having the adhesive layer before the immersion and the polarizing film A' having the adhesive layer in a shrunken state after the immersion are shown. The amount of dimensional change in the polarizing film A having the adhesive layer is the distance between a predetermined point on the side surface of the polarizing film A having the adhesive layer and a predetermined point on the side surface of the polarizing film A' having the adhesive layer. At least a conductive structure is provided at a point b where the amount of dimensional change is 400 μm or less. The amount of dimensional change is preferably 350 μm or less, more preferably 300 μm or less, more preferably 250 μm or less, and more preferably 200 μm or less.

With respect to the polarizing film A having an adhesive layer of Fig. 2, the point b will be explained with respect to the relationship between the absorption axis direction and the direction orthogonal to the absorption axis (ground axis direction). In the polarizing film A having an adhesive layer of Fig. 2, the distance (dimensional change in the ground axis direction) between the point b1 on the side in the same direction as the absorption axis direction and the point b1' of the polarizing film A' having the adhesive layer is exemplified as a case where the dimensional change amount of 400 μm or less is satisfied. Furthermore, in the polarizing film A having an adhesive layer of Fig. 2, if the dimensional change amount of 400 μm or less is satisfied for the point b1, it is considered that the dimensional change amount of 400 μm or less is also satisfied for each point of side b. In addition, in the polarizing film A having an adhesive layer of Fig. 2, for a heteromorphic body in which processing has been performed on the corners of a rectangle, the distance between point b2 on the side of the curve connecting each side in the absorption axis direction and the ground axis direction and point b2' of the polarizing film A' having an adhesive layer is exemplified as a case in which the dimensional change amount satisfies 400 ㎛ or less.

Meanwhile, in the polarizing film A having an adhesive layer of Fig. 2, the distance (the amount of dimensional change in the direction of the absorption axis) between point a on the side in the direction of the ground axis and point a' of the polarizing film A' having the adhesive layer is exemplified as a case where the amount of dimensional change of 400 μm or less is not satisfied. Furthermore, in the polarizing film A having an adhesive layer of Fig. 2, if the amount of dimensional change of 400 μm or less is satisfied for point a, it is thought that the amount of dimensional change of 400 μm or less is not satisfied for each point on side a either.

In addition, in the polarizing film A having an adhesive layer of the present invention, it is preferable that the ratio (b/a) of the amount of dimensional change b (㎛) at the point b and the amount of dimensional change a (㎛) in the direction of the absorption axis satisfies a range of less than 0.8, from the viewpoint of maintaining adhesion to the conductive structure provided on the side. The ratio (b/a) is preferably 0.7 or less, and further preferably 0.6 or less. In addition, the size of the polarizing film (polarizing film A having an adhesive layer) used in the present invention is not particularly limited, but, for example, in the case of a rectangular object, a length of 50 to 1500 mm and a width of 50 to 1500 mm are suitable.

In the liquid crystal panel C of the present invention, the polarizing film A having the adhesive layer is arranged on the side of the first transparent substrate (41) on the viewing side of the liquid crystal cell B (in-cell type liquid crystal cell B in FIGS. 4 to 8) without a conductive layer, as shown in FIG. 3, by the adhesive layer (2). In addition, in the liquid crystal panel C, the polarizing film A having the adhesive layer has a conductive structure (50) on the side surface.

<Polarizing film with adhesive layer>

Below, a polarizing film A having an adhesive layer is described. As described above, the polarizing film A having an adhesive layer of the present invention has a first polarizing film, an anchor layer, and a first adhesive layer.

<First polarizing film>

The first polarizing film is generally used, which has a polarizer and a protective film on one or both sides of the polarizer. The polarizer is not particularly limited, and various types can be used. Examples of the polarizer include a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, an ethylene-vinyl acetate copolymer partially saponified film, etc., which is obtained by adsorbing iodine and uniaxially stretching the film. Among these, a polarizer made of a polyvinyl alcohol film and iodine is suitable. The thickness of these polarizers is not particularly limited, but is generally about 80 ㎛ or less.

In addition, from the viewpoint of heat resistance, it is preferable to use a polarizer having an iodine concentration of 6 wt% or less. The iodine concentration is preferably 5 wt% or less from the viewpoint of heat resistance, and further preferably 4 wt% or less. In addition, from the viewpoint of optical characteristics, the iodine concentration in the polarizer is preferably 1 wt% or more, further preferably 1.5 wt% or more, and further preferably 2 wt% or more. In addition, since the polarizer has a large dimensional change when the iodine concentration increases, it is easy to cause conduction failure due to insufficient adhesion of the conducting structure caused by heat shrinkage, and therefore it is preferable to adjust the iodine concentration of the polarizer within the above range.

In addition, from the viewpoint of heat resistance, it is preferable to use a polarizer having a thickness of more than 10 ㎛ as a polarizer. The thickness is preferably more than 10 ㎛ to 25 ㎛, more preferably 10 to 22 ㎛, and further preferably 10 to 20 ㎛. In addition, the thicker the polarizer, the greater the amount of dimensional change, and it is easy to cause conduction failure due to insufficient adhesion of the conducting structure due to heat shrinkage, so it is preferable to adjust the thickness of the polarizer within the above range.

As a material constituting the protective film, for example, a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, and isotropy is used. Specific examples of such thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyether sulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, cyclic polyolefin resins (norbornene-based resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. In addition, on one side of the polarizer, the protective film is bonded by an adhesive layer, while on the other side, a thermosetting resin or an ultraviolet-curable resin such as a (meth)acrylic type, a urethane type, an acrylic urethane type, an epoxy type, a silicone type, or the like can be used as the protective film. The protective film may contain one or more types of any appropriate additive.

As the material of the above-mentioned protective film (transparent protective film), a cellulose resin or a (meth)acrylic resin is preferable because the variation in the surface resistance value of the adhesive layer can be controlled to be small. In addition, as the (meth)acrylic resin, it is preferable to use a (meth)acrylic resin having a lactone ring structure. As the (meth)acrylic resin having a lactone ring structure, examples thereof include (meth)acrylic resins having a lactone ring structure described in Japanese Patent Application Laid-Open No. 2000-230016, Japanese Patent Application Laid-Open No. 2001-151814, Japanese Patent Application Laid-Open No. 2002-120326, Japanese Patent Application Laid-Open No. 2002-254544, Japanese Patent Application Laid-Open No. 2005-146084, etc. In particular, cellulose resin is preferable compared to (meth)acrylic resin in that it is effective in suppressing polarizer cracks, which are a problem in polarizing films for polarizing protection.

As the above protective film, a phase difference film, a diffusion film, etc. can also be used. As the phase difference film, one can exemplify one having a frontal phase difference of 40 nm or more and/or a thickness direction phase difference of 80 nm or more. The frontal phase difference is usually controlled in a range of 40 to 200 nm, and the thickness direction phase difference is usually controlled in a range of 80 to 300 nm. When a phase difference film is used as the protective film, since the phase difference film also functions as a polarizer protective film, thinning can be achieved.

The above protective film and polarizer are laminated through intervening layers such as an adhesive layer, an adhesive layer, and a lower layer (primer layer). At this time, it is preferable to laminate the two without an air gap through the intervening layers. It is preferable to laminate the protective film and polarizer through an adhesive layer. The adhesive used for bonding the polarizer and the protective film is not particularly limited as long as it is optically transparent, and various forms such as aqueous, solvent-based, hot melt, radical curing, and cationic curing may be used, but an aqueous adhesive or a radical curing adhesive is suitable.

<First adhesive layer>

The above first adhesive layer is formed of an adhesive composition containing a (meth)acrylic polymer (A) and an antistatic agent (B).

The above (meth)acrylic polymer (A) contains, as a monomer unit, an alkyl (meth)acrylate as a main component. In addition, (meth)acrylate refers to acrylate and/or methacrylate, and has the same meaning as (meth) in the present invention.

As the alkyl (meth)acrylate constituting the main skeleton of the (meth)acrylic polymer (A), examples thereof include linear or branched alkyl groups having 1 to 18 carbon atoms. For example, examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, an amyl group, a hexyl group, a cyclohexyl group, a heptyl group, a 2-ethylhexyl group, an isooctyl group, a nonyl group, a decyl group, an isodecyl group, a dodecyl group, an isomyristyl group, a lauryl group, a tridecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, and the like. These can be used alone or in combination. It is preferable that the average carbon number of these alkyl groups is 3 to 9.

The weight ratio of the above alkyl (meth)acrylate is preferably 70 wt% or more, as a monomer unit, based on the weight ratio of the total constituent monomers (100 wt%) constituting the (meth)acrylic polymer (A). The weight ratio of the above alkyl (meth)acrylate can be considered as the remainder of other copolymerization monomers. Setting the weight ratio of the above alkyl (meth)acrylate within the above range is preferable for securing adhesiveness.

Among the above (meth)acrylic polymers (A), in addition to the monomer unit of the above alkyl (meth)acrylate, one or more types of copolymerizable monomers having a polymerizable functional group having an unsaturated double bond such as a (meth)acryloyl group or a vinyl group can be introduced by copolymerization for the purpose of improving adhesiveness or heat resistance.

As the above copolymerizable monomer, examples thereof include functional group-containing monomers such as a carboxyl group-containing monomer, a hydroxyl group-containing monomer, and an amide group-containing monomer.

A carboxyl group-containing monomer is a compound that contains a carboxyl group in its structure and also contains a polymerizable unsaturated double bond such as a (meth)acryloyl group or a vinyl group. Specific examples of the carboxyl group-containing monomer include, for example, (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, etc. Among the above carboxyl group-containing monomers, acrylic acid is preferable from the viewpoints of copolymerizability, price, and adhesive properties.

A hydroxyl group-containing monomer is a compound that contains a hydroxyl group in its structure and also contains a polymerizable unsaturated double bond such as a (meth)acryloyl group or a vinyl group. Specific examples of the hydroxyl group-containing monomer include hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, and 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methylacrylate. Among the above hydroxyl group-containing monomers, from the viewpoint of durability, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferable, and 4-hydroxybutyl (meth)acrylate is particularly preferable.

The carboxyl group-containing monomer and the hydroxyl group-containing monomer become reaction sites with the crosslinking agent when the adhesive composition contains a crosslinking agent. Since the carboxyl group-containing monomer and the hydroxyl group-containing monomer have high reactivity with the intermolecular crosslinking agent, they are preferably used to improve the cohesion and heat resistance of the first adhesive layer obtained. In addition, the carboxyl group-containing monomer is preferable from the viewpoint of achieving both durability and reworkability, and the hydroxyl group-containing monomer is preferable from the viewpoint of reworkability.

The weight ratio of the carboxyl group-containing monomer is preferably 10 wt% or less, more preferably 0.01 to 8 wt%, more preferably 0.05 to 6 wt%, and more preferably 0.1 to 5 wt%. It is preferable from the viewpoint of durability that the weight ratio of the carboxyl group-containing monomer is 0.01 wt% or more. On the other hand, it is not preferable from the viewpoint of reworkability when it exceeds 10 wt%.

The weight ratio of the hydroxyl group-containing monomer is preferably 3 wt% or less, more preferably 0.01 to 3 wt%, more preferably 0.1 to 2 wt%, and more preferably 0.2 to 2 wt%. It is preferable that the weight ratio of the hydroxyl group-containing monomer be 0.01 wt% or more from the viewpoint of crosslinking the first adhesive layer and from the viewpoints of durability and adhesive properties. On the other hand, when it exceeds 3 wt%, it is not preferable from the viewpoint of durability.

An amide group-containing monomer is a compound that contains an amide group in its structure and further contains a polymerizable unsaturated double bond such as a (meth)acryloyl group, a vinyl group, etc. Specific examples of the amide group-containing monomer include acrylamide-based monomers such as (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(meth)acrylamide, N-butyl(meth)acrylamide, N-hexyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methylol-N-propane(meth)acrylamide, aminomethyl(meth)acrylamide, aminoethyl(meth)acrylamide, mercaptomethyl(meth)acrylamide, and mercaptoethyl(meth)acrylamide; N-acryloyl heterocyclic monomers such as N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, and N-(meth)acryloylpyrrolidine; N-vinyl group-containing lactam monomers such as N-vinylpyrrolidone and N-vinyl-ε-caprolactam; and the like. An amide group-containing monomer is preferable for suppressing an increase in surface resistance value over time (particularly in a humidified environment) or satisfying durability. In particular, among the amide group-containing monomers, an N-vinyl group-containing lactam monomer is particularly preferable for suppressing an increase in surface resistance value over time (particularly in a humidified environment) or satisfying durability for a transparent conductive layer (touch sensor layer).

As the weight ratio of the amide group-containing monomer increases, the transparency of the optical film tends to decrease, so the weight ratio is preferably 10 wt% or less, and further preferably 5 wt% or less. From the viewpoint of suppressing an increase in the surface resistance value over time (especially in a humid environment), the weight ratio of the amide group-containing monomer is preferably 0.1 wt% or more. The weight ratio is preferably 0.3 wt% or more, and further preferably 0.5 wt% or more.

In the adhesive composition used for forming the first adhesive layer, when an amide group is introduced into a side chain of the (meth)acrylic polymer (A), which is a base polymer, the presence of the amide group suppresses fluctuations in the surface resistance value of the first adhesive layer adjusted by blending an antistatic agent (e.g., an ionic compound (B)) even in a humidified environment, and is preferably maintained within a desired value range. It is thought that the presence of an amide group introduced as a functional group of a copolymerization monomer into a side chain of the (meth)acrylic polymer (A) increases the compatibility between the (meth)acrylic polymer (A) and the ionic compound (B).

In addition, when the first adhesive layer has an amide group introduced into the side chain of the (meth)acrylic polymer (A), which is the base polymer, it has good durability for both glass and a transparent conductive layer (such as an ITO layer), and can suppress occurrence of peeling or lifting when attached to a liquid crystal panel. In addition, durability can be satisfied even in a humidified environment (after a humidification reliability test).

In addition, as a copolymerization monomer, for example, an aromatic ring-containing (meth)acrylate can be used. An aromatic ring-containing (meth)acrylate is a compound that includes an aromatic ring structure in its structure and also includes a (meth)acryloyl group. As the aromatic ring, a benzene ring, a naphthalene ring, or a biphenyl ring can be mentioned.

Specific examples of the aromatic ring-containing (meth)acrylate include those having a benzene ring, such as benzyl (meth)acrylate, phenyl (meth)acrylate, o-phenylphenol (meth)acrylate, phenoxy (meth)acrylate, phenoxyethyl (meth)acrylate, phenoxypropyl (meth)acrylate, phenoxy diethylene glycol (meth)acrylate, ethylene oxide-modified nonylphenol (meth)acrylate, ethylene oxide-modified cresol (meth)acrylate, phenol ethylene oxide-modified (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, methoxybenzyl (meth)acrylate, chlorobenzyl (meth)acrylate, cresyl (meth)acrylate, and polystyryl (meth)acrylate; Examples thereof include those having a naphthalene ring, such as hydroxyethylated β-naphthol acrylate, 2-naphthoethyl (meth)acrylate, 2-naphthoxyethyl acrylate, and 2-(4-methoxy-1-naphthoxy)ethyl (meth)acrylate; and those having a biphenyl ring, such as biphenyl (meth)acrylate.

Among the above-mentioned aromatic ring-containing (meth)acrylates, from the viewpoint of adhesive properties and durability, benzyl (meth)acrylate and phenoxyethyl (meth)acrylate are preferable, and phenoxyethyl (meth)acrylate is particularly preferable.

The weight ratio of the aromatic ring-containing (meth)acrylate is preferably 25 wt% or less, more preferably 3 to 25 wt%, more preferably 10 to 22 wt%, and more preferably 14 to 20 wt%. When the weight ratio of the aromatic ring-containing (meth)acrylate is 3 wt% or more, it is preferable for suppressing display unevenness. On the other hand, when it exceeds 25 wt%, the suppression of display unevenness is not sufficient, and durability tends to decrease.

Specific examples of other copolymerizable monomers other than those mentioned above include: acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; sulfonic acid group-containing monomers such as allyl sulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid, and sulfopropyl (meth)acrylate; phosphoric acid group-containing monomers such as 2-hydroxyethylacryloyl phosphate, etc.

Also, alkylaminoalkyl (meth)acrylates such as aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and t-butylaminoethyl (meth)acrylate; alkoxyalkyl (meth)acrylates such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate; succinimide monomers such as N-(meth)acryloyloxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, and N-(meth)acryloyl-8-oxyoctamethylenesuccinimide; maleimide monomers such as N-cyclohexylmaleimide, N-isopropyl maleimide, N-laurylmaleimide, and N-phenylmaleimide; Itaconimide monomers such as N-methyl itaconimide, N-ethyl itaconimide, N-butyl itaconimide, N-octyl itaconimide, N-2-ethylhexyl itaconimide, N-cyclohexyl itaconimide, and N-lauryl itaconimide can also be cited as examples of monomers for the purpose of modification.

In addition, as a modifying monomer, vinyl monomers such as vinyl acetate and vinyl propionate; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing (meth)acrylates such as glycidyl (meth)acrylate; glycol (meth)acrylates such as polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, and methoxypolypropylene glycol (meth)acrylate; (meth)acrylate monomers such as tetrahydrofurfuryl (meth)acrylate, fluorine (meth)acrylate, silicone (meth)acrylate, and 2-methoxyethyl acrylate can also be used. Furthermore, isoprene, butadiene, isobutylene, vinyl ether, and the like can be used.

In addition, as copolymerizable monomers other than the above, silane monomers containing silicon atoms, etc. can be mentioned. As the silane monomers, for example, 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, 10-acryloyloxydecyltriethoxysilane, etc. can be mentioned.

In addition, as a copolymerizable monomer, there are polyfunctional monomers having two or more unsaturated double bonds such as a (meth)acryloyl group, a vinyl group, etc., such as esters of (meth)acrylic acid and polyhydric alcohols, such as tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, bisphenol A diglycidyl ether di(meth)acrylate, neopentyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and caprolactone-modified dipentaerythritol hexa(meth)acrylate, and polyester, epoxy, and urethane. Polyester (meth)acrylate, epoxy (meth)acrylate, urethane (meth)acrylate, etc., which have two or more unsaturated double bonds such as (meth)acryloyl group and vinyl group added as functional groups similar to the monomer component to the backbone, can also be used.

The ratio of the other copolymerizable monomer in the (meth)acrylic polymer (A) is preferably about 0 to 10 wt%, more preferably about 0 to 7 wt%, and further preferably about 0 to 5 wt%, based on the weight ratio of the total constituent monomers (100 wt%) of the (meth)acrylic polymer (A).

The (meth)acrylic polymer (A) of the present invention preferably has a weight average molecular weight of 1 million to 2.5 million. Considering durability, particularly heat resistance, the weight average molecular weight is preferably 1.2 million to 2 million. A weight average molecular weight of 1 million or more is preferable from the viewpoint of heat resistance. In addition, if the weight average molecular weight exceeds 2.5 million, the adhesive tends to become hard, making peeling likely to occur. In addition, the weight average molecular weight (Mw)/number average molecular weight (Mn), which represents the molecular weight distribution, is preferably 1.8 or more and 10 or less, more preferably 1.8 to 7, and further preferably 1.8 to 5. When the molecular weight distribution (Mw/Mn) exceeds 10, it is not preferable from the viewpoint of durability. In addition, the weight average molecular weight and molecular weight distribution (Mw/Mn) are measured by GPC (gel permeation chromatography) and obtained from the values calculated by polystyrene conversion.

The production of such a (meth)acrylic polymer (A) can be carried out by appropriately selecting a known production method such as solution polymerization, bulk polymerization, emulsion polymerization, or various radical polymerizations. In addition, the obtained (meth)acrylic polymer (A) may be any of a random copolymer, a block copolymer, a graft copolymer, or the like.

In addition, in solution polymerization, for example, ethyl acetate, toluene, etc. are used as a polymerization solvent. As a specific example of solution polymerization, the reaction is performed under an inert gas stream such as nitrogen, with a polymerization initiator added, and is usually performed at reaction conditions of about 50 to 70°C for about 5 to 30 hours.

The polymerization initiator, chain transfer agent, emulsifier, etc. used in radical polymerization are not particularly limited and can be appropriately selected and used. In addition, the weight average molecular weight of the (meth)acrylic polymer (A) can be controlled by the amount of the polymerization initiator and chain transfer agent used and the reaction conditions, and the amount used is appropriately adjusted depending on these types.

<Anti-Defense Agent>

As antistatic agents, materials capable of imparting antistatic properties, such as ionic surfactants, conductive polymers, and conductive microparticles, can be mentioned. In addition, ionic compounds can be used as antistatic agents.

Examples of ionic surfactants include various surfactants, such as cationic (e.g., quaternary ammonium salt type, phosphonium salt type, sulfonium salt type, etc.), anionic (carboxylic acid type, sulfonate type, sulfate type, phosphate type, phosphite type, etc.), zwitterionic (sulfobetaine type, alkyl betaine type, alkylimidazolium betaine type, etc.), or nonionic (polyhydric alcohol derivatives, β-cyclodextrin inclusion compounds, sorbitan fatty acid monoester/diester, polyalkylene oxide derivatives, amine oxide, etc.).

As conductive polymers, polymers such as polyaniline, polythiophene, polypyrrole, and polyquinoxaline can be mentioned, but among these, polyaniline and polythiophene, which are likely to become water-soluble conductive polymers or water-dispersible conductive polymers, are preferably used. Polythiophene is particularly preferable.

In addition, as the conductive fine particles, metal oxides such as tin oxide, antimony oxide, indium oxide, and zinc oxide can be mentioned. Among these, tin oxide is preferable. As for the tin oxide, in addition to tin oxide, for example, antimony-doped tin oxide, indium-doped tin oxide, aluminum-doped tin oxide, tungsten-doped tin oxide, titanium oxide-cerium oxide-tin oxide complex, titanium oxide-tin oxide complex, etc. can be mentioned. The average particle size of the fine particles is about 1 to 100 nm, preferably 2 to 50 nm.

In addition, as antistatic agents other than the above, examples thereof include permanent antistatic agents of the type in which ion-conducting polymers such as acetylene black, Ketjen black, natural graphite, artificial graphite, titanium black, homopolymers of monomers having cationic (quaternary ammonium salts, etc.), amphoteric (betaine compounds, etc.), anionic (sulfonate, etc.) or nonionic (glycerin, etc.) ion-conducting groups, or copolymers of the monomers with other monomers, polymers having a portion derived from acrylate or methacrylate having a quaternary ammonium salt group, and the like; hydrophilic polymers such as polyethylene methacrylate copolymers are alloyed with acrylic resins, etc.

Among the above examples, it is preferable to use an ionic compound as an antistatic agent used in the formation of the first adhesive layer. As an ionic compound, an ionic liquid is preferable in terms of antistatic function.

≪Ionic Compound≫

In addition, as the ionic compound, an alkali metal salt and/or an organic cation-anion salt can be preferably used. As the alkali metal salt, an organic salt and an inorganic salt of an alkali metal can be used. In addition, the "organic cation-anion salt" as referred to in the present invention means an organic salt, and the cation part thereof is composed of an organic substance, and the anion part may be an organic substance or an inorganic substance. An "organic cation-anion salt" is also referred to as an ionic liquid or an ionic solid.

<Alkali metal salt>

As alkali metal ions constituting the cation portion of the alkali metal salt, lithium, sodium, and potassium ions can be mentioned. Among these alkali metal ions, lithium ion is preferable.

The anion moiety of the alkali metal salt may be composed of an organic substance or an inorganic substance. As the anion moiety constituting the organic salt, for example, CH ₃ COO ^- , CF ₃ COO ^- , CH ₃ SO ₃ ^- , CF ₃ SO ₃ ^- , (CF ₃ SO ₂ ) ₃ C ^- , C ₄ F ₉ SO ₃ ^- , C ₃ F ₇ COO ^- , (CF ₃ SO ₂ )(CF ₃ CO)N ^- , (FSO ₂ ) ₂ N ^- , -O ₃ S(CF ₂ ) ₃ SO ₃ ^- , PF ₆ ^- , CO ₃ ^{2- ,} or the following general formulae (1) to (4),

(1): (CnF _2n+1 SO ₂ ) ₂ N ^- (where n is an integer from 0 to 10),

(2): CF ₂ (C _m F _2m SO ₂ ) ₂ N ^- (where m is an integer from 1 to 10),

(3): -O ₃ S(CF ₂ ) _l SO ₃ ^- (where l is an integer from 1 to 10),

(4): (C _p F _2p+1 SO ₂ )N ^- (C _q F _2q+1 SO ₂ ) (wherein p and q are integers from 1 to 10) are used. In particular, an anion moiety containing a fluorine atom is preferably used because an ionic compound having good ionic dissociation properties is obtained. As an anion moiety constituting an inorganic salt, Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , BF ₄ ^- , PF ₆ ^- , ClO ₄ ^- , NO ₃ ^- , AsF ₆ ^- , SbF ₆ ^- , NbF ₆ ^- , TaF ₆ ^- , (CN) ₂ N ^{- ,} etc. are used. As the anion moiety, (perfluoroalkylsulfonyl)imide represented by the general formula (1) such as (CF ₃ SO ₂ ) ₂ N ^- , (C ₂ F ₅ SO ₂ ) ₂ N ^- is preferable, and (trifluoromethanesulfonyl)imide represented by (CF ₃ SO ₂ ) ₂ N ^- is particularly preferable.

As organic salts of alkali metals, specifically, sodium acetate, sodium alginate, sodium ligninsulfonate, sodium toluenesulfonate, LiCF ₃ SO ₃ , Li(CF ₃ SO ₂ ) ₂ N, Li(CF ₃ SO ₂ ) ₂ N, Li(C ₂ F ₅ SO ₂ ) ₂ N, Li(C ₄ F ₉ SO ₂ ) ₂ N, Li(CF ₃ SO ₂ ) ₃ C, KO ₃ S(CF ₂ ) ₃ SO ₃ K, LiO ₃ S(CF ₂ ) ₃ SO ₃ K, etc., and among these, LiCF ₃ SO ₃ , Li(CF ₃ SO ₂ ) ₂ N, Li(C ₂ F ₅ SO ₂ ) ₂ N, Li(C ₄ F ₉ SO ₂ ) ₂ N, Li(CF ₃ SO ₂ ) ₃ C, etc. are preferable, and Li(CF ₃ Fluorine-containing lithium imide salts such as SO ₂ ) ₂ N, Li(C ₂ F ₅ SO ₂ ) ₂ N, and Li(C ₄ F ₉ SO ₂ ) ₂ N are more preferable, and (perfluoroalkylsulfonyl)imide lithium salts are particularly preferable.

Additionally, as inorganic salts of alkali metals, lithium perchlorate and lithium iodide can be mentioned.

<Organic cation-anion salt>

The organic cation-anion salt used in the present invention is composed of a cation component and an anion component, and the cation component is made of an organic substance. Specific examples of the cation component include a pyridinium cation, a piperidinium cation, a pyrrolidinium cation, a cation having a pyrroline skeleton, a cation having a pyrrole skeleton, an imidazolium cation, a tetrahydropyrimidinium cation, a dihydropyrimidinium cation, a pyrazolium cation, a pyrazolinium cation, a tetraalkylammonium cation, a trialkylsulfonium cation, a tetraalkylphosphonium cation, and the like.

As anion components, for example, Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , BF ₄ ^- , PF ₆ ^- , ClO ₄ ^- , NO ₃ ^- , CH ₃ COO ^- , CF ₃ COO ^- , CH ₃ SO ₃ ^- , CF ₃ SO ₃ ^- , (CF ₃ SO ₂ ) ₃ C ^- , AsF ₆ ^- , SbF ₆ ^- , NbF ₆ ^- , TaF ₆ ^- , (CN) ₂ N ^- , C ₄ F ₉ SO ₃ ^- , C ₃ F ₇ COO ^- , ((CF ₃ SO ₂ )(CF ₃ CO)N ^- , (FSO ₂ ) ₂ N ^- , -O ₃ S(CF ₂ ) ₃ SO ₃ ^- or the following general formulas (1) to (4),

(1): (C _n F _2n+1 SO ₂ ) ₂ N ^- (where n is an integer from 0 to 10),

(2): CF ₂ (C _m F _2m SO ₂ ) ₂ N ^- (where m is an integer from 1 to 10),

(3): -O ₃ S(CF ₂ ) _l SO ₃ ^- (where l is an integer from 1 to 10),

(4): (C _p F _2p+1 SO ₂ )N ^- (C _q F _2q+1 SO ₂ ) (wherein p and q are integers from 1 to 10) are used. Among these, an anionic component containing a fluorine atom is preferably used because an ionic compound having good ionic dissociation properties is obtained.

In addition, as ionic compounds, in addition to the above-mentioned alkali metal salts and organic cation-anion salts, inorganic salts such as ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride, and ammonium sulfate can be mentioned. These ionic compounds can be used alone or in combination.

From the viewpoint of poor conductivity due to disconnection in a high-temperature environment, it is preferable that the above-mentioned ionic compound use one having a cationic component having a molecular weight of 210 or less. The molecular weight of the cationic component is further preferably 150 or less, further preferably 110 or less, further preferably 50 or less, and further preferably 10 or less. The larger the molecular weight of the cationic component, the more it inhibits entanglement between (meth)acrylic polymers in the pressure-sensitive adhesive layer, and the more the physical properties of the pressure-sensitive adhesive layer tend to become flexible. Therefore, the smaller the molecular weight, the less likely it is that the physical properties of the first pressure-sensitive adhesive layer become flexible, and the smaller the molecular weight, the more it is possible to suppress poor conductivity due to disconnection in a high-temperature environment. In addition, the smaller the molecular weight of the cationic component, the more likely it is that the surface resistance value of the first pressure-sensitive adhesive layer will decrease, which is also preferable in that it suppresses electrostatic unevenness.

In the case where the ionic compound is an alkali metal salt, since alkali metal ions such as lithium, sodium, and potassium are cation components having a molecular weight of 210 or less, an alkali metal salt having these alkali metal ions as cation components can be suitably used. In particular, from the viewpoint of compatibility with the adhesive layer, an organic salt of an alkali metal in which the anion component of the alkali metal salt is composed of an organic substance is preferable. Furthermore, as the alkali metal ion, lithium ion having the smallest molecular weight is preferable. As the ionic compound, a lithium salt is suitable, and an organic salt of lithium is particularly preferable. On the other hand, in the case where the ionic compound is an organic cation-anion salt, one having a molecular weight of 210 or less can be selected and used from among the cation components of the above examples. In particular, from the viewpoint of compatibility with the adhesive layer, an organic cation-anion salt in which the anion component is composed of an organic substance is preferable.

The amount of the adhesive and antistatic agent to be used varies depending on their types, but is controlled so that the surface resistance value of the first adhesive layer obtained becomes 1×10 ⁸ to 1×10 ¹² Ω/□. For example, it is preferable to use an antistatic agent (for example, in the case of an ionic compound) in the range of 0.05 to 20 parts by weight with respect to 100 parts by weight of the (meth)acrylic polymer. It is preferable to use 0.05 parts by weight or more of the antistatic agent from the viewpoint of improving the antistatic performance. Furthermore, the antistatic agent (B) is preferably 0.1 parts by weight or more, and further preferably 0.5 parts by weight or more. In order to satisfy durability, it is preferable to use 20 parts by weight or less, and further preferably 10 parts by weight or less.

The ratio of the ionic compound (B) in the adhesive composition of the present invention can be appropriately adjusted so as to satisfy the antistatic properties of the first adhesive layer and the sensitivity of the touch panel. For example, it is preferable to adjust the ratio of the ionic compound (B ⁾ according to the type of the liquid crystal panel with a built-in touch sensing function while considering the type of the protective film of the polarizing film, etc., so that the surface resistance value of the first ^adhesive layer is in the range of 1.0×10 8 to 1.0×10 12 Ω/□. For example, in the in-cell type liquid crystal panel with a built-in touch sensing function illustrated in Fig. 8, the initial surface resistance value of the first adhesive layer is preferably controlled in the range of 1×10 ⁸ to 1×10 ¹² Ω/□, and further preferably controlled in the range of 1×10 ⁸ to 1×10 ¹¹ Ω/□.

The adhesive composition of the present invention may contain a crosslinking agent (C). As the crosslinking agent (C), an organic crosslinking agent or a polyfunctional metal chelate can be used. Examples of the organic crosslinking agent include an isocyanate crosslinking agent, a peroxide crosslinking agent, an epoxy crosslinking agent, an imine crosslinking agent, and the like. The polyfunctional metal chelate is one in which a polyvalent metal is covalently bonded or coordinately bonded with an organic compound. Examples of the polyvalent metal atom include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti, and the like. Examples of the atom in the organic compound to form a covalent or coordinate bond include an oxygen atom, and examples of the organic compound include alkyl esters, alcohol compounds, carboxylic acid compounds, ether compounds, ketone compounds, and the like.

As the crosslinking agent (C), an isocyanate-based crosslinking agent and/or a peroxide-based crosslinking agent is preferable.

As the isocyanate crosslinking agent (C), a compound having at least two isocyanate groups can be used. For example, known aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates, etc., which are generally used in urethane reactions, are used.

As for the peroxide, any peroxide that generates radical active species by heating or light irradiation to promote crosslinking of the base polymer of the adhesive composition may be suitably used; however, considering workability and stability, it is preferable to use a peroxide having a half-life temperature of 80°C to 160°C for 1 minute, and it is more preferable to use a peroxide having a half-life temperature of 90°C to 140°C.

Examples of peroxides that can be used include di(2-ethylhexyl) peroxydicarbonate (half-life temperature for 1 minute: 90.6°C), di(4-t-butylcyclohexyl) peroxydicarbonate (half-life temperature for 1 minute: 92.1°C), di-sec-butyl peroxydicarbonate (half-life temperature for 1 minute: 92.4°C), t-butyl peroxyneodecanoate (half-life temperature for 1 minute: 103.5°C), t-hexyl peroxypivalate (half-life temperature for 1 minute: 109.1°C), t-butyl peroxypivalate (half-life temperature for 1 minute: 110.3°C), dilauroyl peroxide (half-life temperature for 1 minute: 116.4°C), di-n-octanoyl peroxide (half-life temperature for 1 minute: 117.4°C), Examples thereof include 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (half-life temperature in 1 minute: 124.3°C), di(4-methylbenzoyl)peroxide (half-life temperature in 1 minute: 128.2°C), dibenzoyl peroxide (half-life temperature in 1 minute: 130.0°C), t-butylperoxyisobutyrate (half-life temperature in 1 minute: 136.1°C), and 1,1-di(t-hexylperoxy)cyclohexane (half-life temperature in 1 minute: 149.2°C). Among these, di(4-t-butylcyclohexyl)peroxydicarbonate (half-life temperature for 1 minute: 92.1°C), dilauroyl peroxide (half-life temperature for 1 minute: 116.4°C), and dibenzoyl peroxide (half-life temperature for 1 minute: 130.0°C) are preferably used because they have excellent crosslinking reaction efficiency.

The amount of the crosslinking agent (C) to be used is preferably 3 parts by weight or less, further preferably 0.01 to 3 parts by weight, further preferably 0.02 to 2 parts by weight, and further preferably 0.03 to 1 part by weight, relative to 100 parts by weight of the (meth)acrylic polymer (A). In addition, if the amount of the crosslinking agent (C) is less than 0.01 part by weight, there is a concern that the first adhesive layer may become insufficiently crosslinked and may not satisfy the durability or adhesive properties, while if it exceeds 3 parts by weight, the first adhesive layer becomes too hard and tends to exhibit reduced durability.

The adhesive composition of the present invention may contain a silane coupling agent (D). By using the silane coupling agent (D), durability can be improved. As the silane coupling agent, specifically, for example, epoxy group-containing silane coupling agents such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, amino group-containing silane coupling agents such as 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethylbutylidene)propylamine, and N-phenyl-γ-aminopropyltrimethoxysilane, (meth)acryl group-containing silane coupling agents such as 3-acryloxypropyltrimethoxysilane, and 3-methacryloxypropyltriethoxysilane, and isocyanate group-containing silane coupling agents such as 3-isocyanatepropyltriethoxysilane. Silane coupling agents, etc. can be mentioned. Among the silane coupling agents exemplified above, an epoxy group-containing silane coupling agent is preferable.

In addition, as the silane coupling agent (D), one having multiple alkoxysilyl groups in the molecule can also be used. Specifically, examples thereof include X-41-1053, X-41-1059A, X-41-1056, X-41-1805, X-41-1818, X-41-1810, and X-40-2651 manufactured by Shin-Etsu Chemical Co., Ltd. These silane coupling agents having multiple alkoxysilyl groups in the molecule are preferable because they are difficult to volatilize and are effective in improving durability because they have multiple alkoxysilyl groups. In particular, durability is suitable even when the adherend of an optical film having an adhesive layer is a transparent conductive layer (for example, ITO, etc.) to which alkoxysilyl groups are less likely to react than glass. In addition, the silane coupling agent having multiple alkoxysilyl groups in the molecule preferably has an epoxy group in the molecule, and more preferably has multiple epoxy groups in the molecule. A silane coupling agent having a plurality of alkoxysilyl groups in the molecule and also having an epoxy group tends to have good durability even when the adherend is a transparent conductive layer (e.g., ITO, etc.). Specific examples of a silane coupling agent having a plurality of alkoxysilyl groups in the molecule and also having an epoxy group include X-41-1053, X-41-1059A, and X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd., and in particular, X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd., which has a high epoxy group content, is preferable.

The above silane coupling agent (D) may be used alone or as a mixture of two or more, but the total content is preferably 5 parts by weight or less, more preferably 0.001 to 5 parts by weight, further preferably 0.01 to 1 part by weight, further preferably 0.02 to 1 part by weight, and further preferably 0.05 to 0.6 parts by weight, per 100 parts by weight of the (meth)acrylic polymer (A). This amount improves durability.

In addition, the adhesive composition of the present invention may contain other known additives, for example, polyether compounds having a reactive silyl group, polyether compounds of polyalkylene glycols such as polypropylene glycol, colorants, powders such as pigments, dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particles, thin films, etc. may be appropriately added depending on the intended use. In addition, a redox system in which a reducing agent is added may be employed within a controllable range. It is preferable to use these additives in an amount of 5 parts by weight or less, further 3 parts by weight or less, further 1 part by weight or less, relative to 100 parts by weight of the (meth)acrylic polymer (A).

As a method for forming the first adhesive layer, for example, the adhesive composition is applied to a separator or the like that has undergone a peeling treatment, the polymerization solvent or the like is dried and removed to form the first adhesive layer, and then the first adhesive layer is transferred to an optical film (polarizing film), or the adhesive composition is applied to an optical film (polarizing film), the polymerization solvent or the like is dried and removed to form the first adhesive layer on the optical film, etc. In addition, when applying the adhesive, one or more solvents other than the polymerization solvent may be newly added as appropriate.

The thickness of the first adhesive layer is not particularly limited and is, for example, about 1 to 100 μm. Preferably, it is 2 to 50 μm, more preferably, it is 2 to 40 μm, and even more preferably, it is 5 to 35 μm.

The thickness of the first adhesive layer (2) is preferably 5 to 100 µm, more preferably 5 to 50 µm, and further preferably 10 to 35 µm from the viewpoint of ensuring durability and securing a contact area with the conductive structure on the side.

<Anchor layer>

The anchor layer can be formed from various materials. The anchor layer preferably has a thickness of 0.01 to 0.5 ㎛, more preferably 0.01 to 0.2 ㎛, and more preferably 0.01 to 0.1 ㎛.

The anchor layer contains a conductive polymer and thus has conductivity. From the viewpoint of antistatic function, its surface resistance value is preferably 1×10 ⁶ to 1×10 ⁹ Ω/□.

Conductive polymers are preferably used from the viewpoints of optical properties, appearance, antistatic effect, and heat and humidity stability of the antistatic effect. In particular, conductive polymers such as polyaniline and polythiophene are preferably used. The conductive polymer may be suitably organic solvent-soluble, water-soluble, or water-dispersible, but a water-soluble conductive polymer or a water-dispersible conductive polymer is preferably used. The water-soluble conductive polymer or the water-dispersible conductive polymer can be prepared as an aqueous solution or aqueous dispersion for the coating solution when forming the antistatic layer, and since the coating solution does not require the use of a non-aqueous organic solvent, deterioration of the optical film substrate due to the organic solvent can be suppressed. In addition, the aqueous solution or aqueous dispersion can contain an aqueous solvent in addition to water. Examples thereof include alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-amyl alcohol, isoamyl alcohol, sec-amyl alcohol, tert-amyl alcohol, 1-ethyl-1-propanol, 2-methyl-1-butanol, n-hexanol, and cyclohexanol.

In addition, it is preferable that the water-soluble conductive polymer or water-dispersible conductive polymer such as polyaniline or polythiophene has a hydrophilic functional group in the molecule. Examples of the hydrophilic functional group include a sulfone group, an amino group, an amide group, an imino group, a quaternary ammonium salt group, a hydroxyl group, a mercapto group, a hydrazino group, a carboxyl group, a sulfuric acid ester group, a phosphoric acid ester group, or a salt thereof. By having a hydrophilic functional group in the molecule, it becomes easy to dissolve in water or easy to disperse in the form of fine particles in water, so that the water-soluble conductive polymer or water-dispersible conductive polymer can be easily prepared.

Examples of commercially available water-soluble conductive polymers include polyaniline sulfonic acid (manufactured by Mitsubishi Rayon Co., Ltd., weight average molecular weight of 150,000 based on polystyrene equivalents). Examples of commercially available water-dispersible conductive polymers include polythiophene-based conductive polymers (manufactured by Nagase Chemtex Co., Ltd., trade name: Denatron series).

In addition, as a material for forming an anchor layer, a binder component may be added together with the antistatic agent for the purpose of improving the film-forming property of the antistatic agent, adhesion to the optical film, etc. When the antistatic agent is an aqueous material of a water-soluble conductive polymer or a water-dispersible conductive polymer, a water-soluble or water-dispersible binder component is used. Examples of the binder include oxazoline group-containing polymers, polyurethane resins, polyester resins, acrylic resins, polyether resins, cellulose resins, polyvinyl alcohol resins, epoxy resins, polyvinylpyrrolidone, polystyrene resins, polyethylene glycol, pentaerythritol, and the like. In particular, polyurethane resins, polyester resins, and acrylic resins are preferable. One or more of these binders may be used appropriately according to the purpose.

The amount of antistatic agent and binder used varies depending on their types, but it is desirable to control them so that the surface resistance value of the resulting anchor layer is 1×10 ⁶ to 1×10 ⁹ Ω/□.

<Surface treatment layer>

As the surface treatment layer, a functional layer such as a hard coat layer, an anti-glare treatment layer, an anti-reflection layer, an anti-stick layer, or an anti-glare layer can be provided. The surface treatment layer can be provided on a surface of the protective film to which the polarizer is not adhered.

In addition, when controlling the conductivity of the surface treatment layer (4), the surface resistance value of the surface treatment layer (4) is preferably 1×10 ⁶ to 1×10 ¹¹ Ω/□, more preferably 1×10 ⁶ to 1×10 ¹⁰ Ω/□, and more preferably 1×10 ⁶ to 1×10 ⁹ Ω, from the viewpoints of antistatic function and touch sensor sensitivity.

When imparting conductivity to the surface treatment layer, it is preferable that the surface treatment layer be formed so that the surface resistance value is 1×10 ⁶ to 1×10 ¹¹ Ω/□. The surface treatment layer can be imparted conductivity by containing an antistatic agent. The surface treatment layer can be provided not only on the protective film used for the first polarizing film, but can also be provided separately, as a separate entity from the protective film. As the antistatic agent used to impart conductivity to the surface treatment layer, those exemplified above can be used, but it is preferable to contain at least one selected from an ionic surfactant, a conductive fine particle, and a conductive polymer. As the antistatic agent used in the surface treatment layer, it is preferable that it is a conductive fine particle from the viewpoints of optical characteristics, appearance, antistatic effect, and stability of the antistatic effect under heat and humidity.

As the surface treatment layer, it is preferable that it is a hard coat layer. As a material for forming the hard coat layer, for example, a thermoplastic resin, a material that is cured by heat or radiation can be used. As the material, a radiation-curable resin such as a thermosetting resin, an ultraviolet-curable resin, or an electron beam-curable resin can be exemplified. Among these, an ultraviolet-curable resin that can efficiently form a cured resin layer by a simple processing operation in a curing treatment by ultraviolet irradiation is suitable. Examples of these curable resins include various types such as polyester, acrylic, urethane, amide, silicone, epoxy, and melamine, and their monomers, oligomers, polymers, etc. In terms of the speed of the processing speed and the small amount of heat damage to the substrate, a radiation-curable resin, especially an ultraviolet-curable resin, is particularly preferable. Preferably used ultraviolet-curable resins include, for example, those having an ultraviolet-polymerizable functional group, and among them, those containing an acrylic monomer or oligomer component having two or more, particularly 3 to 6, of the functional groups. Additionally, a photopolymerization initiator is mixed into the ultraviolet-curable resin.

In addition, as the surface treatment layer, an anti-glare treatment layer or an anti-reflection layer for the purpose of improving visibility can be provided. In addition, an anti-glare treatment layer or an anti-reflection layer can be provided on the hard coat layer. The constituent material of the anti-glare treatment layer is not particularly limited, and for example, a radiation-curable resin, a thermosetting resin, a thermoplastic resin, etc. can be used. As the anti-reflection layer, titanium oxide, zirconium oxide, silicon oxide, magnesium fluoride, etc. can be used. The anti-reflection layer can be provided in multiple layers. In addition, as the surface treatment layer, an anti-sticking layer, etc. can be exemplified.

The thickness of the above surface treatment layer can be appropriately set depending on the type of the surface treatment layer, but is generally preferably 0.1 to 100 µm. For example, the thickness of the hard coat layer is preferably 0.5 to 20 µm. The thickness of the hard coat layer is not particularly limited, but if it is too thin, sufficient hardness as a hard coat layer cannot be obtained, while if it is too thick, cracks or peeling easily occur. The thickness of the hard coat layer is more preferably 1 to 10 µm.

In the surface treatment layer, the amount of the antistatic agent and the binder (resin material, etc.) to be used varies depending on their types, but it is preferable to control the surface resistance value of the obtained surface treatment layer to be 1×10 ⁷ to 1×10 ¹¹ Ω/□. Normally, for 100 parts by weight of the antistatic agent, the amount of the binder is 1,000 parts by weight or less, and more preferably 10 to 200 parts by weight.

<Other floors>

In the polarizing film having the adhesive layer of the present invention, in addition to each layer described above, an adhesive-facilitating layer may be provided on the surface of the side on which the anchor layer of the first polarizing film is provided, or various adhesive-facilitating treatments such as corona treatment and plasma treatment may be performed.

Below, liquid crystal cell B and liquid crystal panel C are described.

(Liquid crystal cell B)

As illustrated in FIG. 3, the liquid crystal cell B has a liquid crystal layer (20) including liquid crystal molecules that are homogeneously aligned in the absence of an electric field, a first transparent substrate (41) and a second transparent substrate (42) that sandwich and support the liquid crystal layer (20) from both sides. In FIG. 3, the electrodes within the liquid crystal cell B are omitted.

As the liquid crystal layer (20) used in the liquid crystal cell B, a liquid crystal layer containing liquid crystal molecules that are homogeneously aligned in the absence of an electric field is used. As the liquid crystal layer (20), for example, an IPS type liquid crystal layer is suitably used. In addition, as the liquid crystal layer (20), any type of liquid crystal layer, such as a TN type, an STN type, a π type, or a VA type, can be used. The thickness of the liquid crystal layer (20) is, for example, about 1.5 ㎛ to 4 ㎛.

The material forming the transparent substrate may be, for example, glass or a polymer film. Examples of the polymer film include polyethylene terephthalate, polycycloolefin, polycarbonate, etc. When the transparent substrate is formed of glass, the thickness thereof is, for example, about 0.1 mm to 1 mm. When the transparent substrate is formed of a polymer film, the thickness thereof is, for example, about 10 µm to 200 µm. The transparent substrate may have an adhesive-friendly layer or a hard coat layer on its surface.

(Incell type liquid crystal cell B)

As the above-mentioned liquid crystal cell B, the in-cell type liquid crystal cell B illustrated in FIGS. 4 to 8 can be used. The in-cell type liquid crystal cell B also has a touch sensing electrode portion according to the functions of a touch sensor and touch driving between the first transparent substrate (41) and the second transparent substrate (42).

The above touch sensing electrode section can be formed by a touch sensor electrode (31) and a touch driving electrode (32), as illustrated in FIGS. 4, 5, and 8. The touch sensor electrode referred to here refers to a touch detection (reception) electrode. The touch sensor electrode (31) and the touch driving electrode (32) can each be formed independently by various patterns. For example, in the case of the in-cell type liquid crystal cell B being a plane, they can be arranged in a pattern that intersects at right angles by a format that is independently provided in the X-axis direction and the Y-axis direction. In addition, in FIGS. 4, 5, and 8, the touch sensor electrode (31) is arranged on the side (viewing side) of the first transparent substrate (41) relative to the touch driving electrode (32), but, conversely, the touch driving electrode (32) can also be arranged on the side (viewing side) of the first transparent substrate (41) relative to the touch sensor electrode (31).

Meanwhile, the touch sensing electrode part may use an electrode (33) formed by integrating a touch sensor electrode and a touch driving electrode, as shown in FIGS. 6 and 7.

In addition, the touch sensing electrode part can be arranged between the liquid crystal layer (20) and the first transparent substrate (41) or the second transparent substrate (42). FIG. 4 and FIG. 6 show a case where the touch sensing electrode part is arranged between the liquid crystal layer (20) and the first transparent substrate (41) (on the viewing side relative to the liquid crystal layer (20). FIG. 5 and FIG. 7 show a case where the touch sensing electrode part is arranged between the liquid crystal layer (20) and the second transparent substrate (42) (on the backlight side relative to the liquid crystal layer (20).

In addition, as shown in FIG. 8, the touch sensing electrode section may have a touch sensor electrode (31) between the liquid crystal layer (20) and the first transparent substrate (41), and a touch driving electrode (32) between the liquid crystal layer (20) and the second transparent substrate (42).

In addition, the driving electrode in the above touch sensing electrode section (the touch driving electrode (32), the touch sensor electrode, and the electrode (33) formed by integrating the touch driving electrode) can also be used as a common electrode that controls the liquid crystal layer (20).

As described above, the in-cell type liquid crystal cell B has a touch sensing electrode portion according to the function of a touch sensor and touch driving inside the liquid crystal cell, and does not have a touch sensor electrode on the outside of the liquid crystal cell. That is, a conductive layer (surface resistance value of 1×10 ¹³ Ω/□ or less) is not provided on the viewer side (the liquid crystal cell side relative to the first adhesive layer (2) of the in-cell type liquid crystal panel C) relative to the first transparent substrate (41) of the in-cell type liquid crystal cell B. In addition, in the in-cell type liquid crystal panel C described in FIGS. 4 to 8, the order of each configuration is shown, but the in-cell type liquid crystal panel C can have an appropriately different configuration. A color filter substrate can be provided on the liquid crystal cell (the first transparent substrate (41)).

The touch sensor electrode (31) (capacitance sensor), the touch drive electrode (32), or the electrode (33) in which the touch sensor electrode and the touch drive electrode are formed integrally, which forms the touch sensing electrode portion, is formed as a transparent conductive layer. The constituent material of the transparent conductive layer is not particularly limited, and examples thereof include metals such as gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, and tungsten, and alloys of these metals. In addition, the constituent material of the transparent conductive layer includes metal oxides of indium, tin, zinc, gallium, antimony, zirconium, and cadmium, and specifically, metal oxides composed of indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof are exemplified. In addition, other metal compounds composed of copper iodide and the like are used. The metal oxide may further include oxides of metal atoms shown in the above group, if necessary. For example, indium oxide (ITO) containing tin oxide, tin oxide containing antimony, etc. are preferably used, and ITO is particularly preferably used. As for ITO, it is preferable to contain 80 to 99 wt% of indium oxide and 1 to 20 wt% of tin oxide.

The electrodes (touch sensor electrodes (31), touch drive electrodes (32), and electrodes (33) in which the touch sensor electrodes and touch drive electrodes are formed integrally) of the above-described touch sensing electrode portion can be formed as transparent electrode patterns on the inner side (the liquid crystal layer (20) side within the in-cell type liquid crystal cell B) of the first transparent substrate (41) and/or the second transparent substrate (42) by a conventional method. The transparent electrode pattern is electrically connected to arrangement wiring (not shown) formed on the end of the transparent substrate, and the arrangement wiring is connected to a controller IC (not shown). The shape of the transparent electrode pattern can adopt any shape, such as a comb shape, a stripe shape, or a diamond shape, depending on the application. The height of the transparent electrode pattern is, for example, 10 nm to 100 nm, and the width is 0.1 mm to 5 mm.

(LCD panel C)

The liquid crystal panel C of the present invention may have a polarizing film A having an adhesive layer on the viewing side of the liquid crystal cell B as shown in Fig. 3, and a second polarizing film (11) on the opposite side. In addition, in Figs. 4 to 8, an in-cell liquid crystal panel using an in-cell liquid crystal cell B is shown.

The polarizing film A having the adhesive layer is arranged on the side of the first transparent substrate (41) of the liquid crystal cell B via the first adhesive layer (2) without passing through a conductive layer. Meanwhile, the second polarizing film (11) is arranged on the side of the second transparent substrate (42) of the liquid crystal cell B via the second adhesive layer (12). The first polarizing film (1) and the second polarizing film (11) in the polarizing film A having the adhesive layer are arranged on both sides of the liquid crystal layer (20) such that the transmission axes (or absorption axes) of the respective polarizers are orthogonal.

As the second polarizing film (11), the film described for the first polarizing film (1) can be used. The second polarizing film (11) may be the same as the first polarizing film (1), or may be different.

In forming the second adhesive layer (12), the adhesive described in the first adhesive layer (2) can be used. The adhesive used in forming the second adhesive layer (12) may be the same as that used in the first adhesive layer (2), or a different one may be used. The thickness of the second adhesive layer (12) is not particularly limited, and is, for example, about 1 to 100 µm. Preferably, it is 2 to 50 µm, more preferably, it is 2 to 40 µm, and even more preferably, it is 5 to 35 µm.

In addition, in the liquid crystal panel C, the side surface of the polarizing film A having the adhesive layer has a conductive structure (50) as shown in FIG. 3 (FIGS. 4 to 8). In addition, the conductive structure (50) is provided on the side surface of the first adhesive layer (2) containing an antistatic agent and the anchor layer (3) containing a conductive polymer. In addition, in FIG. 3 (FIGS. 4 to 8), in addition to the conductive structure (50), a conductive structure (51) is provided on the side surface of the surface treatment layer (4) and the first polarizing film (1), but it is optional to provide the conductive structure (51). It is preferable to provide the conductive structure when each layer has conductivity.

The conductive structure (51, 50) is provided at least at the point b (the dimensional change amount is 400 µm or less) shown in FIG. 2 on the side surface of the polarizing film A having the adhesive layer. The conductive structure (51, 50) may be provided at at least one of the points b, and may be provided on the entire side surface. When the conductive structure is provided at b, in order to secure conduction on the side surface, the conductive structure is preferably provided at a ratio of 1 area% or more, and preferably 3 area% or more, with point b on the side surface as a reference (at least including it). On the other hand, from the viewpoint of wiring, the conductive structure is preferably 99 area% or less on the side surface, and further preferably 95 area% or less.

By means of the above conductive structure (51, 50), by connecting a potential from the side of the polarizing film A having the adhesive layer to another suitable location, the generation of static electricity can be suppressed. As a material forming the conductive structure (51, 50), for example, a conductive paste such as silver, gold or other metal paste can be mentioned, and in addition, a conductive adhesive and any other suitable conductive material can be used. The conductive structure (51, 50) can also be formed in a linear shape extending from the side of the polarizing film A having the adhesive layer.

In addition, the first polarizing film (1) arranged on the viewing side of the liquid crystal layer (20) and the second polarizing film (11) arranged on the opposite side of the viewing side of the liquid crystal layer (20) can be used by laminating other optical films according to the suitability of each arrangement location. Examples of the other optical films include optical layers used in the formation of liquid crystal display devices, such as reflectors, semi-transparent plates, phase difference films (including wavelength plates such as 1/2 or 1/4), visual compensation films, and brightness enhancement films. These can be used in one layer or two or more layers.

(Liquid crystal display)

A liquid crystal display device using the liquid crystal panel C of the present invention can appropriately use a member forming a liquid crystal display device, such as one using a backlight or a reflector in a lighting system.

Example

Hereinafter, the present invention will be specifically described by way of manufacturing examples and examples, but the present invention is not limited to these examples. In addition, all parts and % in each example are based on weight. Unless otherwise specified below, the room temperature storage conditions are all 23°C and 65% RH.

<Measurement of weight average molecular weight of (meth)acrylic polymers>

The weight average molecular weight (Mw) of (meth)acrylic polymers was measured by GPC (gel permeation chromatography). Mw/Mn was also measured in the same manner.

·Analytical device: Dososaje, HLC-8120GPC

·Column: Dososaje, G7000H _XL +GMH _XL +GMH _XL

·Column size: Each 7.8mmφ×30cm Total 90cm

·Column temperature: 40℃

·Flow rate: 0.8mL/min

·Injection volume: 100μL

·Eluent: Tetrahydrofuran

·Detector: Differential refractometer (RI)

·Standard sample: Polystyrene

<Manufacturing Example 1>

(Fabrication of 40 μm TAC film with HC, 25 μm TAC film with HC)

A photopolymerization initiator (BASF Corporation, trade name: IRGACURE907) was added in an amount of 5 parts and a leveling agent (DIC Corporation, trade name: GRANDIC PC4100) was added in an amount of 0.1 part per 100 parts of the solid content in the solution to a resin solution (DIC Corporation, trade name: Unidic 17-806, solid content concentration: 80%) containing a UV-curable resin monomer or oligomer containing urethane acrylate as a main component, dissolved in butyl acetate. Then, cyclopentanone and propylene glycol monomethyl ether were added to the solution at a ratio of 45:55 so that the solid content concentration in the solution became 36%, thereby producing a hard coat layer-forming material. The produced hard coat layer forming material was applied on TJ40UL (manufactured by Fujifilm, raw material: triacetyl cellulose polymer, thickness: 40 μm) so that the thickness of the hard coat layer after curing became 7 μm, thereby forming a coating film. Thereafter, the coating film was dried at 90°C for 1 minute, and further, the coating film was irradiated with ultraviolet rays at an accumulated light amount of 300 mJ/cm2 using a high-pressure mercury lamp, and the coating film was cured to form a hard coat layer (HC), thereby producing a 40 μm TAC film having HC.

<Manufacturing Example 2>

(Production of 30㎛ acrylic film)

In a 30 L volume reactor equipped with a stirring device, a temperature sensor, a cooling tube, and a nitrogen introduction tube, 8,000 g of methyl methacrylate (MMA), 2,000 g of methyl 2-(hydroxymethyl)acrylate (MHMA), 10,000 g of 4-methyl-2-pentanone (methyl isobutyl ketone, MIBK), and 5 g of n-dodecyl mercaptan were charged, and while passing nitrogen therethrough, the temperature was increased to 105°C, and in the refluxed portion, 5.0 g of t-butyl peroxyisopropyl carbonate (Kayacarbon BIC-7, manufactured by Kayaku Akujo Co., Ltd.) as a polymerization initiator was added, and simultaneously, a solution consisting of 10.0 g of t-butyl peroxyisopropyl carbonate and 230 g of MIBK was added dropwise over 4 hours, and under reflux, the temperature was increased to about 105 to Solution polymerization was performed at 120°C, and further maturation was performed over 4 hours.

To the obtained polymer solution, 30 g of a mixture of stearyl phosphate/distearyl phosphate (PhoslexA-18, manufactured by Sakai Chemical Industry Co., Ltd.) was added, and a cyclization condensation reaction was performed at about 90 to 120°C for 5 hours under reflux. Next, the obtained polymer solution was introduced into a vented screw twin-screw extruder (φ=29.75 mm, L/D=30) having a barrel temperature of 260°C, a rotational speed of 100 rpm, a reduced pressure of 13.3 to 400 hPa (10 to 300 mmHg), one rear vent, and four porous vents, at a processing speed of 2.0 kg/h in terms of resin amount, and further cyclization condensation reaction and devolatilization were performed in the extruder, followed by extrusion, whereby transparent pellets of a lactone ring-containing polymer were obtained.

As for the obtained lactone ring-containing polymer, dynamic TG was measured, and a mass decrease of 0.17 mass% was detected. In addition, this lactone ring-containing polymer had a weight average molecular weight of 133,000, a melt flow rate of 6.5 g/10 min, and a glass transition temperature of 131°C.

The obtained pellets were mixed and extruded with an acrylonitrile-styrene (AS) resin (Toyo ASAS20, manufactured by Toyo Styrene Co., Ltd.) at a mass ratio of 90/10 using a single-screw extruder (screw 30 mmφ), thereby obtaining transparent pellets. The glass transition temperature of the obtained pellets was 127°C.

These pellets were melt-extruded from a 400 mm wide coat hanger type T die using a 50 mmφ single-axis extruder to produce a film having a thickness of 120 μm. The produced film was stretched 2.0 times vertically and 2.0 times horizontally using a two-axis stretching device under temperature conditions of 150°C, thereby obtaining a stretched film (30 μm acrylic film) having a thickness of 30 μm. When the optical properties of this stretched film were measured, the total light transmittance was 93%, the in-plane retardation Δnd was 0.8 nm, and the thickness direction retardation Rth was 1.5 nm.

<Production of polarizing film (1)>

A polyvinyl alcohol film having a thickness of 45 ㎛ was stretched up to 3 times while dyeing it for 1 minute in a 0.3% concentration iodine solution at 30°C between rolls with different speed ratios. Thereafter, it was stretched up to 6 times while immersed in an aqueous solution containing 4% concentration boric acid and 10% concentration potassium iodide at 60°C for 0.5 minute. Then, it was washed by immersing it in an aqueous solution containing 1.5% concentration potassium iodide at 30°C for 10 seconds, and then dried at 50°C for 4 minutes to obtain a polarizer having a thickness of 18 ㎛. A 40 μm TAC film (triacetyl cellulose film side) having saponified HC obtained in Manufacturing Example 1 was bonded to one side of the polarizer, and a 30 μm acrylic film obtained in Manufacturing Example 2 was bonded to the other side using a polyvinyl alcohol-based adhesive to produce a polarizing film (1).

<Production of polarizing film (2)>

(Production of thin polarizer A)

One side of an amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 μm) having an absorption rate of 0.75% and a Tg of 75°C was subjected to corona treatment, and an aqueous solution containing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetoacetyl-modified polyvinyl alcohol (degree of polymerization 1200, degree of acetoacetyl modification 4.6%, degree of saponification 99.0 mol% or higher, manufactured by Nippon Kose Chemical Industries, Ltd., trade name "Goseppimer Z200") in a ratio of 9:1 was applied to the corona-treated side and dried at 25°C to form a polyvinyl alcohol-based resin layer having a thickness of 11 μm, and a laminate was produced.

The obtained laminate was stretched uniaxially in the longitudinal direction (length direction) 2.0 times in a free end between rolls at different speeds in an oven at 120°C (air-assisted stretching treatment).

Next, the laminate was immersed in an insolubilizing bath (boric acid aqueous solution obtained by mixing 4 parts by weight of boric acid per 100 parts by weight of water) at a temperature of 30°C for 30 seconds (insolubilizing treatment).

Next, the polarizing plate was immersed in a dyeing bath having a temperature of 30°C while adjusting the iodine concentration and immersion time so that the polarizing plate has a predetermined transmittance. In this example, 0.2 parts by weight of iodine and 1.0 parts by weight of potassium iodide were mixed with respect to 100 parts by weight of water, and the polarizing plate was immersed in an iodine aqueous solution for 60 seconds (dyeing treatment).

Next, it was immersed in a crosslinking bath (boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water) at a temperature of 30°C for 30 seconds (crosslinking treatment).

Thereafter, the laminate was immersed in a boric acid aqueous solution (an aqueous solution obtained by mixing 4 parts by weight of boric acid and 5 parts by weight of potassium iodide per 100 parts by weight of water) having a temperature of 70°C, and was uniaxially stretched between rolls at different speeds so that the total stretching ratio in the longitudinal direction was 5.5 times (underwater stretching treatment).

After that, the laminate was immersed in a washing bath (aqueous solution obtained by mixing 4 parts by weight of potassium iodide per 100 parts by weight of water) at a temperature of 30°C (washing treatment).

By the above, an optical film laminate including a polarizer having a thickness of 5 μm was obtained.

(Production of adhesive for application to transparent protective film)

45 parts by weight of acryloylmorpholine, 45 parts of 1,9-nonanediol diacrylate, 10 parts of an acrylic oligomer (ARUFONUP 1190, manufactured by Toagosei Co., Ltd.) obtained by polymerizing (meth)acrylic monomer, 3 parts of a photopolymerization initiator (IRGACURE 907, manufactured by BASF Co., Ltd.), and 1.5 parts of a polymerization initiator (KAYACURE DETX-S, manufactured by Nippon Kayaku Co., Ltd.) were mixed to prepare an ultraviolet-curable adhesive.

The 25 μm TAC film (triacetyl cellulose film side) having HC obtained in Manufacturing Example 1 was bonded while applying the UV-curable adhesive to the surface of the polarizer A of the optical film laminate so that the thickness of the adhesive layer after curing becomes 1 μm, and then irradiating with ultraviolet rays as an active energy ray to harden the adhesive. The ultraviolet irradiation was performed using a gallium-filled metal halide lamp, an irradiation device: Light HAMMER 10 manufactured by Fusion UV Systems, Inc., a valve: V valve, a peak illuminance: 1600 mW/cm2, and an accumulated irradiance of 1000/mJ/cm2 (wavelength 380 to 440 nm), and the illuminance of the ultraviolet rays was measured using a Sola-Check system manufactured by Solatell. Next, the amorphous PET substrate was peeled off, and a polarizing film (2) using a thin polarizer was produced. The optical properties of the obtained polarizing film were a group transmittance of 42.8% and a polarization degree of 99.99%.

The iodine concentration of the polarizer for the polarizing film (1) obtained above was 3.2 wt%. In addition, the iodine concentration of the polarizer according to the polarizing film (2) obtained above was 7.2 wt%. In addition, the iodine concentration (wt%) of the polarizer can be adjusted by, for example, immersing a polyvinyl alcohol-based film or a polyvinyl alcohol layer in an iodine aqueous solution having a predetermined concentration for a predetermined time during the production of the polarizer. The iodine concentration of each polarizer according to the polarizing film (1) shown in Table 2 was adjusted by changing the concentration of the iodine solution for dyeing the polyvinyl alcohol film during the production of the polarizing film (1).

<Polarizer film thickness>

The polarizer film thickness (㎛) was measured using a spectroscopic film thickness meter MCPD-1000 (manufactured by Otsuka Denshi Co., Ltd.). The polarizer included in the sample (polarizing film (1) or (2) prepared above) was removed by immersing the sample in a solvent and dissolving the polarizer protective film. For example, when the polarizer protective film was a triacetyl cellulose film, dichloromethane was used as the solvent, and when the polarizer protective film was an acrylic film, methyl ethyl ketone was used, respectively. In addition, when the resin of the polarizer protective film provided on one side of the polarizer and the resin of the polarizer protective film provided on the other side were different, the respective resins were sequentially dissolved using the above-described solvent.

<Iodine concentration in polarizer>

The iodine concentration of the polarizer is measured by the following method. In addition, the polarizer included in the sample is extracted by immersing the sample in a solvent and dissolving the polarizer protective film, as in the case of measuring the film thickness of the polarizer.

(X-ray fluorescence measurement)

When measuring the iodine concentration of a polarizer, first, the iodine concentration was quantified using the calibration curve method of fluorescence X-ray analysis. The fluorescence X-ray analysis device ZSX-PRIMUS IV (Rigaku Corporation) was used as the device. The value directly obtained by the fluorescence X-ray analysis device is not the concentration of each element, but the fluorescence X-ray intensity (kcps) of the wavelength unique to each element. Therefore, in order to obtain the iodine concentration contained in the polarizer, it is necessary to convert the fluorescence X-ray intensity into a concentration using a calibration curve. The iodine concentration of the polarizer in this specification and the like means the iodine concentration (weight%) based on the weight of the polarizer.

(Creating a calibration curve)

The calibration curve was prepared according to the following procedure.

1. By dissolving a base amount of potassium iodide in a polyvinyl alcohol aqueous solution, seven kinds of polyvinyl alcohol aqueous solutions containing iodine at a base concentration were produced. The polyvinyl alcohol aqueous solutions were applied to polyethylene terephthalate, dried, and peeled off, thereby producing samples 1 to 7 of polyvinyl alcohol films containing iodine at a base concentration.

In addition, the iodine concentration (weight%) of the polyvinyl alcohol film is calculated by the following mathematical formula 1.

[Formula 1] Iodine concentration (weight%) = {amount of potassium iodide (g) / (amount of potassium iodide (g) + weight of polyvinyl alcohol (g))} × (127/166)

(Molecular weight of iodine: 127, molecular weight of potassium: 39)

2. For the manufactured polyvinyl alcohol film, the fluorescence X-ray intensity (kcps) corresponding to iodine was measured using a fluorescence X-ray analyzer ZSX-PRIMUS IV (manufactured by Rigaku Co., Ltd.). In addition, the fluorescence X-ray intensity (kcps) is the peak value of the fluorescence X-ray spectrum. In addition, the film thickness of the manufactured polyvinyl alcohol film was measured using a spectroscopic film thickness meter MCPD-1000 (manufactured by Otsuka Electronics Co., Ltd.).

3. Divide the fluorescence X-ray intensity by the thickness (㎛) of the polyvinyl alcohol film, and obtain the fluorescence X-ray intensity per unit thickness of the film (kcps/㎛). The iodine concentration and fluorescence X-ray intensity per unit thickness of each sample are shown in Table 1.

4. Based on the results shown in Table 1, a calibration curve was created with the horizontal axis representing the fluorescence X-ray intensity per unit thickness of the polyvinyl alcohol (PVA) film (kcps/㎛) and the vertical axis representing the iodine concentration (weight%: wt%) contained in the polyvinyl alcohol film. The created calibration curve is shown in Fig. 9. An equation for obtaining the iodine concentration from the fluorescence X-ray intensity per unit thickness of the polyvinyl alcohol film from the calibration curve was determined as shown in Equation 2. In addition, R2 in Fig. 9 is a correlation coefficient.

[Formula 2] (Iodine concentration) (wt%) = 14.474 × (fluorescence X-ray intensity per unit thickness of polyvinyl alcohol film) (kcps/㎛)

(Calculation of iodine concentration in polarizer)

The fluorescence X-ray intensity obtained from the sample measurement is divided by the thickness to obtain the fluorescence X-ray intensity per unit thickness (kcps/㎛). The fluorescence X-ray intensity per unit thickness of each sample is substituted into Equation 2 to obtain the iodine concentration.

Example 1

<Preparation of forming material for the challenge layer (anchor layer)>

8.6 parts of a solution containing 10 to 50 wt% of a thiophene-based polymer (trade name: Denatron P-580W, manufactured by Nagase Chemtex Co., Ltd.), 1 part of a solution containing an oxazoline group-containing acrylic polymer (trade name: Epocross WS-700, manufactured by Nippon Shokubai Co., Ltd.), and 90.4 parts of water were mixed to prepare a coating liquid for forming a conductive layer having a solid content concentration of 0.5 wt%. The obtained coating liquid for forming a conductive layer contained 0.04 wt% of a polythiophene-based polymer and 0.25 wt% of an oxazoline group-containing acrylic polymer.

(Production of polarizing film with a challenging layer (anchor layer))

The coating solution for forming the conductive layer was applied to the acrylic film side of the polarizing film (1) so that the thickness after drying was 0.06 µm, and dried at 80° C. for 2 minutes to form a conductive layer. The obtained conductive layer contained 8 wt% and 50 wt% of a thiophene-based polymer and an oxazoline-containing acrylic polymer, respectively.

(Preparation of acrylic polymer (A))

A monomer mixture containing 78.9 parts of butylacrylate, 16 parts of phenoxyethyl acrylate, 5 parts of acrylic acid, and 0.1 part of 4-hydroxybutylacrylate was charged into a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser. In addition, with respect to 100 parts of the above monomer mixture (solid content), 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator was charged together with 100 parts of ethyl acetate, and nitrogen gas was introduced while gently stirring to perform nitrogen replacement, and then the liquid temperature inside the flask was maintained at around 55°C to perform a polymerization reaction for 8 hours, thereby preparing a solution of an acrylic polymer having a weight-average molecular weight (Mw) of 1,950,000 and Mw/Mn = 3.9.

(Preparation of adhesive composition)

For 100 parts of the solution solid content of the acrylic polymer obtained above, 1 part of trimethylpropylammonium-bis(trifluorosulfonylimide), 0.6 part of an isocyanate crosslinking agent (Coronate L, trimethylolpropanetolylene diisocyanate manufactured by Tosoh Corporation), and 0.1 part of benzoyl peroxide (Nippon Yushi Corporation's Naifer BMT) were mixed to prepare a solution of an acrylic adhesive composition.

(Production of polarizing film with adhesive layer)

Next, a solution of the acrylic adhesive composition was applied to one side of a polyethylene terephthalate film (separator film: MRF38, manufactured by Mitsubishi Chemical Corporation) treated with a silicone-based release agent so that the adhesive layer thickness after drying became 20 μm, and drying was performed at 155°C for 1 minute, thereby forming an adhesive layer on the surface of the separator film. Next, the adhesive layer formed on the separator film was transferred to the conductive layer (anchor layer) of the polarizing film (1) manufactured above, thereby producing a polarizing film having an adhesive layer.

Examples 2 to 5, Comparative Examples 1 to 3

In Example 1, except that the type of polarizing film, the type or mixing ratio of the antistatic agent (ionic compound (B)) used in the preparation of the adhesive composition, and the thickness of the anchor layer were changed as shown in Table 2, a polarizing film having an adhesive layer was produced in the same manner as in Example 1. When the polarizing film (2) was used as the polarizing film, a conductive layer similar to the above was formed on the polarizer surface of the polarizing film (2) (the polarizer surface on which the 25 μm TAC film having HC is not provided). In Comparative Example 2, no conductive layer was formed.

The polarizing films having an adhesive layer obtained in the above examples and comparative examples were evaluated as follows. The evaluation results are shown in Table 2.

<Surface resistance value (Ω/□): Conductivity>

For the anchor layer and adhesive layer, the surface resistance value was measured.

The surface resistance value of the anchor layer was measured for the anchor layer-side surface of a polarizing film having an anchor layer before forming an adhesive layer.

The surface resistance value of the adhesive layer was measured on the surface of the adhesive layer formed on the separator film. The measurement was performed using MCP-HT450 manufactured by Mitsubishi Chemical Analytech Co., Ltd.

<Dimension change>

A polarizing film having an adhesive layer was cut to 10 cm (absorption axis direction) x 10 cm (ground axis direction) and attached to non-alkali glass (Corning Corporation) to prepare a sample. The sample was placed in a heating tester at 105°C. After 500 hours, the sample was removed, and the difference between the position of the polarizing film having an adhesive layer before placing it in the heating tester and the position of the polarizing film having an adhesive layer after placing it in the heating test was measured, and this was taken as the amount of dimensional change. The measurement was performed at Point a: the central point of the side in the same direction as the ground axis direction of the rectangular sample (shrinkage in the direction of the absorption axis) and Point b: the central point of the side in the same direction as the absorption axis direction of the rectangle (shrinkage in the direction of the ground axis).

<ESD test after heating>

After peeling the separator film from the polarizing film having the adhesive layer, it was attached to the viewing side of the in-cell type liquid crystal cell, as shown in Fig. 7. Then, a 5 mm wide silver paste was applied to the side part point b of the polarizing film having the attached adhesive layer so as to cover each side part of the hard coat layer, the polarizing film, the anchor layer, and the adhesive layer, and after drying, the liquid crystal cell was stored at 85°C or 105°C for 120 hours, then taken out, and connected to a grounding electrode from the outside. Furthermore, the arrangement wiring (not shown) around the transparent electrode pattern inside the in-cell type liquid crystal cell was connected to a controller IC (not shown), and a liquid crystal display device with a built-in touch sensing function was manufactured. In the liquid crystal display device, an electrostatic discharge gun was fired at an applied voltage of 15 kV to the polarizing film surface, and the time until the white void portion formed by electricity disappeared was measured, and the result was judged according to the following criteria.

(metewand)

◎: Less than 0.5 seconds.

○: More than 0.5 seconds to less than 1 second.

△: More than 1 second, less than 5 seconds.

×: More than 5 seconds.

<Polyene>

In a high temperature and high humidity environment, the group transmittance of the polarizing film laminate decreases. It is presumed that this decrease is caused by polyeneization of polyvinyl alcohol. Polyene refers to -(CH=CH)n- and can be formed in a polarizing film by heating. Polyene significantly reduces the transmittance of the polarizing film. In addition, in a high temperature and high humidity environment, the polyvinyl alcohol-polyiodine complex is easily destroyed, and I ^- and I ₂ are generated. It is thought that polyeneization of polyvinyl alcohol occurs by the dehydration reaction promoted by iodine (I ₂ ) generated in a high temperature and high humidity environment and heating (chemical formula 1).

[Chemical Formula 1]

It is thought that the polyvinyl alcohol-polyiodine complex present in the polarizer is destroyed by heating, resulting in the formation of a charge transfer complex (HO… _I2 ) between the OH group in the polyvinyl alcohol and _I2 , which is then polyenated via the OI group.

<Evaluation of polyenzyme>

A polarizing film having an adhesive layer was subjected to a heating test for 500 hours in an environment of 105°C, and the group transmittance of the sample was measured before and after the test, and the change in group transmittance ΔTs was obtained by the following formula.

ΔTs=Ts(500)-Ts(0)

Here, Ts(0) is the group transmittance of the sample before heating, and Ts(500) is the group transmittance after heating for 500 hours in an environment of 105℃.

The sample in question was evaluated based on the following criteria.

(metewand)

○: ΔTs is 0 or more

×: ΔTs is less than 0

<Durability Test>

The polarizing film having the adhesive layer thus produced was cut to a size of 300×220mm so that the absorption axis of the polarizing film was parallel to the long side. The polarizing film having the adhesive layer was laminated to a 350×250mm×0.7mm thick alkali-free glass (Corning, trade name “EG-XG”) using a laminator. Next, the adhesive layer was adhered to the glass by autoclaving at 50°C and 0.5 MPa for 15 minutes. The sample to which this treatment had been applied was treated in an atmosphere of 105°C for 500 hours, and then the appearance of the sample was evaluated by visual inspection using the following criteria.

(metewand)

◎: No changes in appearance such as foaming or peeling.

○: There is some peeling or foaming at the end, but it is not a practical problem.

△: There is peeling or foaming at the end, but if it is not for a special purpose, there is no practical problem.

×: There is significant peeling at the end, which is problematic for practical use.

In Table 2,

BA is butylacrylate,

PEA is phenoxyethyl acrylate,

AA is acrylic acid,

HBA is 4-hydroxybutylacrylate,

Isocyanate type, isocyanate crosslinking agent (Coronate L from Tosoh Corporation, trimethylolpropanetolylene diisocyanate),

BPO is benzoyl peroxide (Nippon Yushisha's Nippon ...

K-TFSI is potassium bis(trifluoromethanesulfonyl)imide,

Li-TFSI is lithium bis(trifluoromethanesulfonyl)imide,

TMPA-TFSI is trimethylpropylammonium-bis(trifluorosulfonylimide),

TBMA-TFSI is tributylmethyl ammonium-bis(trifluorosulfonylimide),

MTOA-TFSI is methyltrioctylammonium bis(trifluorosulfonylimide)

It represents .

A: Polarizing film with adhesive layer
B: Liquid crystal cell (in-cell type liquid crystal cell)
C: Liquid crystal panel (in-cell liquid crystal panel)
1, 11: 1st and 2nd polarizing films
2, 12: 1st and 2nd adhesive layers
3: Anchor layer
4: Surface treatment layer
20: Liquid crystal layer
31: Touch sensor electrode
32: Touch driving electrode
33: Touch drive electrode and sensor electrode
41, 42: First and second transparent substrates

Claims (9)

A liquid crystal cell having a liquid crystal layer including liquid crystal molecules that are homogeneously aligned in the absence of an electric field, a first transparent substrate and a second transparent substrate that support the liquid crystal layer by sandwiching it from both sides,
A liquid crystal panel having a polarizing film having an adhesive layer arranged through a first adhesive layer without a conductive layer on the side of the first transparent substrate on the viewing side of the liquid crystal cell, and further having a conductive structure on the side of the polarizing film having the adhesive layer.
A polarizing film having the adhesive layer has a first polarizing film, an anchor layer, and a first adhesive layer in this order,
The above first polarizing film contains a polarizer having an iodine concentration of 6 wt% or less and a thickness of more than 10 ㎛ to 25 ㎛,
The above anchor layer contains a conductive polymer,
The above first adhesive layer is formed of an adhesive composition containing a (meth)acrylic polymer (A) and an antistatic agent (B).
A liquid crystal panel characterized in that the above-mentioned conductive structure is provided at least at point b on the side where the amount of dimensional change in the film plane direction of the polarizing film having the adhesive layer becomes 400 ㎛ or less when a dimensional shrinkage test of the polarizing film having the adhesive layer is performed in an environment of 105°C for 500 hours. In the first paragraph,
A liquid crystal panel characterized in that the dimensional change of the point b at which the above-mentioned conductive structure is provided is 250㎛ or less. In the first paragraph,
A liquid crystal panel, characterized in that the anchor layer has a thickness of 0.01 to 0.5 ㎛ and a surface resistance value of 1×10 ⁶ to 1×10 ⁹ Ω/□. In the first paragraph,
A liquid crystal panel, characterized in that the first adhesive layer has a thickness of 1 to 100 ㎛ and a surface resistance value of 1×10 ⁸ to 1×10 ¹² Ω/□. In the first paragraph,
A liquid crystal panel characterized in that the above first polarizing film is a double-sided protective polarizing film having a polarizer and protective films on both sides of the polarizer. In the first paragraph,
A liquid crystal panel characterized in that the liquid crystal cell is an in-cell type liquid crystal cell having a touch sensing electrode portion according to the function of a touch sensor and touch actuation between the first transparent substrate and the second transparent substrate. In any one of claims 1 to 6,
A liquid crystal panel characterized by having a second polarizing film disposed through a second adhesive layer on the side of the second transparent substrate of the liquid crystal cell. A liquid crystal display device having a liquid crystal panel as described in claim 7. delete

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