TWI821528B - Liquid crystal panels and liquid crystal display devices - Google Patents

Abstract

The present invention is a liquid crystal panel, which has a liquid crystal unit and a polarizing film with an adhesive layer, and has a conductive structure on the side of the polarizing film with an adhesive layer. The liquid crystal unit has a first transparent layer sandwiching a liquid crystal layer on both sides. The substrate and the second transparent substrate, and the polarizing film with the adhesive layer is disposed on the side of the first transparent substrate on the viewing side of the liquid crystal unit through the first adhesive layer without interposing the conductive layer; the aforementioned adhesive layer The polarizing film has a first polarizing film and a first adhesive layer in sequence, the aforementioned first polarizing film contains a polarizer with an iodine concentration of less than 6% by weight, and the aforementioned first adhesive layer is made of a (meth)acrylic acid-based polymer. It is formed from an adhesive composition of substance (A) and an ionic compound (B) whose molecular weight of the cationic component is 210 or less. The liquid crystal panel of the present invention has good antistatic performance and can meet the conduction reliability in high temperature areas.

Description

Liquid crystal panel and liquid crystal display device

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

Liquid crystal display devices generally have polarizing films bonded to both sides of the liquid crystal unit through an adhesive layer according to their image formation method. Moreover, products equipped with touch panels on the display screen of liquid crystal display devices have been put into practical use. As for touch panels, there are various formats such as capacitive type, resistive film type, optical type, ultrasonic type or electromagnetic induction type. Recently, capacitive type is mostly used. In recent years, liquid crystal display devices with touch sensing functions embedded with capacitive sensors as the touch sensor portion have been used.

On the other hand, when manufacturing a liquid crystal display device, when the polarizing film with the adhesive layer is attached to the liquid crystal unit, the release film will be peeled off from the adhesive layer of the polarizing film with the adhesive layer, and the release film will be peeled off. Films can generate static electricity. In addition, static electricity is also generated when peeling off the surface protective film of the polarizing film attached to the liquid crystal cell or when peeling off the surface protective film covering the window. The static electricity generated thereby affects the orientation of the liquid crystal layer inside the liquid crystal display device, causing defects. Therefore, for example, by forming an antistatic layer on the outside of the polarizing film, the generation of static electricity can be suppressed.

On the other hand, the capacitive sensor of a liquid crystal display device with a touch sensing function is used to detect the weak capacitance formed by the transparent electrode pattern and the finger when the user's finger approaches the surface. If there is a conductive layer such as an antistatic layer between the above-mentioned transparent electrode pattern and the user's finger, the electric field between the driving electrode and the sensor electrode will be disordered, resulting in unstable sensor electrode capacity and degradation of the touch panel. Sensitivity may cause malfunction. For a liquid crystal display device with a touch sensing function, it is required to suppress the generation of static electricity while also suppressing the malfunction of the capacitive sensor. For example, to address the aforementioned issues, some literature proposes that in a liquid crystal display device with a touch sensing function, an antistatic layer with a surface resistance of 1.0×10 ⁹ ~1.0×10 ¹¹ Ω/□ be disposed on the viewing side of the liquid crystal layer. polarizing film to reduce the occurrence of display defects or malfunctions (Patent Document 1). Furthermore, it is proposed to arrange the polarizing film placed on the viewing side through an adhesive layer containing an antistatic agent and an anchor layer containing a conductive polymer (Patent Documents 2 and 3).

Prior technical literature

patent documents

Patent Document 1: Japanese Patent Application Publication No. 2013-105154

Patent Document 2: Japanese Patent Application Publication No. 2017-068022

Patent Document 3: Japanese Patent Application Publication No. 2011-528448

According to the polarizing film having an antistatic layer described in Patent Document 1, the generation of static electricity can be suppressed to a certain extent. However, in Patent Document 1, the antistatic layer is disposed far away from the source of static electricity, so the effect is not as good as when the antistatic function is imparted to the adhesive layer. It is also known that in a liquid crystal display device with a touch sensing function, by providing a conductive structure on the side of the polarizing film, conductivity from the side can be provided. However, when the antistatic layer is very thin, due to the contact between the side and the conductive structure If the area is small, sufficient electrical conductivity cannot be obtained and poor conduction may occur. On the other hand, it is known that once the antistatic layer becomes thicker, the sensitivity of the touch sensor will decrease. It is also known that the antistatic layer provided on the outside of the polarizing film may not be able to obtain sufficient protection due to poor adhesion to the conductive structure provided on the side in a humidified or heated environment (after a humidified or heated reliability test). conductivity, causing poor conduction.

On the other hand, according to the use of conductive adhesives described in Patent Documents 2 and 3, A liquid crystal panel with a polarizing film layer can suppress static unevenness better than Patent Document 1. In particular, a liquid crystal panel in which a polarizing film with an adhesive layer is disposed on the viewing side of the liquid crystal cell without a conductive layer interposed therebetween is required to have high conductivity. However, when the liquid crystal panel is used in a vehicle-mounted liquid crystal display device, it will be exposed to a higher temperature environment than when used in general TVs or mobile phones, so conductive properties in high-temperature areas are required, and even if patent documents are used The liquid crystal panels described in 2 and 3 still cannot meet the conductive characteristics in high temperature areas. In addition, liquid crystal display devices for automotive use require durability in high-temperature areas.

The object of the present invention is to provide a liquid crystal panel, which has a liquid crystal unit and a polarizing film with an adhesive layer applied to the viewing side. The liquid crystal panel has good antistatic performance and can meet the conduction reliability and reliability in high temperature areas. Durability.

Another object of the present invention is to provide a liquid crystal display device using the above-mentioned liquid crystal panel.

As a result of repeated efforts to solve the above-mentioned problems, the inventors found that the above-mentioned problems can be solved by the following liquid crystal panel, and thus completed the present invention.

That is, the present invention relates to a liquid crystal panel, which has a liquid crystal unit and a polarizing film with an adhesive layer, and has a conductive structure on the side of the polarizing film with an adhesive layer. The liquid crystal unit has a liquid crystal layer sandwiching the aforementioned polarizing film on both sides. The first transparent substrate and the second transparent substrate of the liquid crystal layer. The liquid crystal layer contains liquid crystal molecules oriented in parallel in the absence of electric field, and the polarizing film attached to the adhesive layer does not pass through the first adhesive through the conductive layer. The layer is disposed on the side of the first transparent substrate on the viewing side of the liquid crystal unit; the liquid crystal panel is characterized in that: the polarizing film with the adhesive layer has a first polarizing film and a first adhesive layer in sequence, and the polarizing film Polarizing elements containing an iodine concentration of less than 6% by weight, and The first adhesive layer is formed from an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B) with a molecular weight of cationic component of 210 or less.

In the aforementioned liquid crystal panel, the aforementioned cationic component is preferably lithium ion.

The liquid crystal panel preferably contains 1 to 13 parts by weight of the ionic compound (B) based on 100 parts by weight of the (meth)acrylic polymer (A).

In the aforementioned liquid crystal panel, the aforementioned first polarizing film preferably contains a polarizing element with a thickness greater than 10 μm .

In the above-mentioned liquid crystal panel, the above-mentioned conductive structure should be provided at least in the following position: when the size shrinkage test of the above-mentioned polarizing film with the adhesive layer is carried out in an environment of 85°C and 500 hours, the polarizing film with the adhesive layer is The amount of dimensional change in the film surface direction becomes point b on the side surface of 400 μm or less.

In the above-mentioned liquid crystal panel, the first polarizing film is preferably a double-sided protective polarizing film having a polarizing element and protective films on both sides of the polarizing element.

In the aforementioned built-in liquid crystal panel, the aforementioned liquid crystal unit may be a built-in liquid crystal unit. The built-in liquid crystal unit has a touch sensor and a touch driving function between the first transparent substrate and the second transparent substrate. control sensing electrode part.

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

Furthermore, the present invention relates to a liquid crystal display device having the above-mentioned liquid crystal panel.

The polarizing film attached to the adhesive layer on the viewing side of the liquid crystal panel of the present invention contains an ionic compound in the adhesive layer, and the antistatic performance can be improved through the adhesive layer. Moreover, the polarizing film attached to the adhesive layer is on the side and Conductive structure contacts. Therefore, even when the polarizing film with the adhesive layer is placed on the viewing side of the liquid crystal unit without interposing the conductive layer, the conduction of the side surface of the polarizing film with the adhesive layer is still ensured. It can prevent uneven static electricity caused by poor conduction.

As mentioned above, the conductive properties can be improved by adding ionic compounds to the adhesive layer. However, it is known that the hardness (glue displacement) of the adhesive layer will vary depending on the type of ionic compound added. If the adhesive layer becomes soft due to the compound, the displacement of the adhesive layer will become larger, and poor conduction caused by disconnection may easily occur in a high-temperature environment (especially above 80°C). In addition, the heating shrinkage of the polarizing film can be controlled to a small extent by using a thin polarizing element, so the impact of the aforementioned breakage can be smaller. However, if the polarizing element becomes thinner, the iodine concentration per unit thickness will tend to become higher. As a result, the iodine concentration in thin polarizers will become higher. Therefore, when using thin polarizers, polyolefinization of the polarizer will easily occur in a high temperature (especially higher than 80°C) environment, resulting in insufficient optical properties.

In the present invention, it is known that an ionic compound with a small molecular weight of a cationic component can suppress the displacement of the adhesive layer even in a high-temperature (especially higher than 80°C) environment. Therefore, the ionic compound is one with a cationic component. Those with a molecular weight of 210 or less. In particular, it is known that when a lithium salt is used as the cationic component of the ionic compound, the displacement amount is effectively suppressed.

As mentioned above, in the present invention, the polarizing film uses a polarizer containing an iodine concentration of 6% by weight or less, and the ionic compound is a cationic component with a molecular weight of 210 or less, thereby satisfying the requirements in high temperature areas (especially higher than 80℃) conduction reliability and durability.

A, A′: Polarizing film with adhesive layer

B: Liquid crystal unit (built-in liquid crystal unit)

C: LCD panel (built-in LCD panel)

1,11: 1st and 2nd polarizing film

2,12: 1st and 2nd adhesive layer

3: Anchor layer

4: Surface treatment layer

20: Liquid crystal layer

31:Touch sensor electrode

32: Touch drive electrode

33: Touch drive electrode and sensor electrode

41,42: 1st and 2nd transparent substrate

50,51: conduction structure

a,a′,b1,b1′,b2,b2′: points

a, b: side

FIG. 1 is a cross-sectional view showing an example of a polarizing film used as an adhesive layer on the viewing side of the liquid crystal panel of the present invention.

2 is an example of a top view conceptual diagram illustrating the dimensional change state of the polarizing film used in the adhesive layer on the viewing side of the liquid crystal panel of the present invention before and after shrinkage in the film surface direction.

FIG. 3 is a cross-sectional view showing an example of the liquid crystal panel of the present invention.

FIG. 4 is a cross-sectional view showing an example of the built-in liquid crystal panel of the present invention.

FIG. 5 is a cross-sectional view showing an example of the built-in liquid crystal panel of the present invention.

FIG. 6 is a cross-sectional view showing an example of the built-in liquid crystal panel of the present invention.

FIG. 7 is a cross-sectional view showing an example of the built-in liquid crystal panel of the present invention.

FIG. 8 is a cross-sectional view showing an example of the built-in liquid crystal panel of the present invention.

Figure 9 is a calibration curve made when calculating the iodine concentration of polarizers.

The present invention will be described below with reference to the drawings. The polarizing film A used for the adhesive layer on the viewing side of the liquid crystal panel of the present invention has a first polarizing film 1 and a first adhesive layer 2 . In addition, the polarizing film A with the adhesive layer may have a surface treatment layer 4 on the viewing side of the first polarizing film 1, and may have an anchoring layer 3 between the first polarizing film 1 and the first adhesive layer 2. FIG. 1 illustrates a case where the surface treatment layer 4, the first polarizing film 1, the anchor layer 3, and the first adhesive layer 2 are provided in this order. In addition, although not shown in FIG. 1 , a separator can be provided on the first adhesive layer 2 of the polarizing film A with an adhesive layer of the present invention, and a surface protection film can be provided on the surface treatment layer 4 .

In addition, the first polarizing film 1 can be used with a protective film on one or both sides of a polarizer. However, from the perspective of optical durability, compared with a single-sided polarizing protection film having a protective film on only one side of a polarizer, The film should be used as a double-sided protective polarizing film with protective films on both sides (no picture).

In addition, in the liquid crystal panel of the present invention, the conductive structure is selected to be provided on the side of the polarizing film with the adhesive layer where the heating shrinkage is smaller (that is, the dimensional change is less than 400 μm), so that it can meet the requirements at high temperatures. conduction reliability and durability in areas (especially above 80°C).

Figure 2 is a top view conceptual diagram showing the dimensional change state before and after shrinkage in the direction of the film surface before and after the polarizing film A with the adhesive layer is put into an environment of 85°C for 500 hours for a dimensional shrinkage test. An example. Figure 2 shows the polarizing film A with the adhesive layer before being put in and the polarizing film A ' with the adhesive layer in a shrunk state after being put in. The dimensional change amount of the polarizing film A with the adhesive layer is the distance between the predetermined point on the side of the polarizing film A with the adhesive layer and the predetermined point on the side of the polarizing film A ' with the adhesive layer. A conductive structure is provided at least at point b where the dimensional change amount is 400 μm or less. The aforementioned dimensional change amount is preferably 350 μm, and more preferably not more than 300 μm, and preferably not more than 250 μm, and more preferably not more than 200 μm.

Regarding the polarizing film A with an adhesive layer in Figure 2, point b will be described regarding the relationship between the absorption axis direction and the direction orthogonal to the absorption axis (slow axis direction). In the polarizing film A with the adhesive layer in Figure 2, the distance (dimensional change in the slow axis direction) between point b1 located on the side surface in the same direction as the absorption axis and point b1 ' of the polarizing film A ' with the adhesive layer is exemplified. amount) meets the aforementioned dimensional change amount of 400 μm or less. In addition, taking the polarizing film A with the adhesive layer in Figure 2 as an example, we believe that as long as the dimensional change at point b1 is 400 μm or less, the dimensional change at each point on side b will also be 400 μm or less. In addition, in the polarizing film A with the adhesive layer in Figure 2, for a special-shaped object with processing applied to the corners of a rectangle, points b2 and The distance between the point b2 ′ of the polarizing film A ′ with the adhesive layer satisfies the above-mentioned dimensional change amount of 400 μm or less.

On the other hand, in the polarizing film A with the adhesive layer in Figure 2, the distance (the size in the absorption axis direction) between the point a on the side in the slow axis direction and the point a ' of the polarizing film A ' with the adhesive layer is exemplified. Change amount) does not meet the above-mentioned dimensional change amount of 400 μm or less. In addition, taking the polarizing film A with an adhesive layer in Figure 3 as an example, we believe that as long as the dimensional change at point a is 400 μm or less, the dimensional change at each point on side a will not be 400 μm or less.

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

In the liquid crystal panel C of the present invention, as shown in Figure 3, the polarizing film A with the adhesive layer is disposed in the liquid crystal unit B through the adhesive layer 2 without intervening the conductive layer (it is built-in in Figures 4 to 8). The side of the first transparent substrate 41 on the viewing side of the liquid crystal cell B). In addition, in the above-mentioned liquid crystal panel C, in the above-mentioned appendix The side surface of the polarizing film A of the adhesive layer has a conductive structure 50 .

<Polarizing film with adhesive layer>

The following describes the polarizing film A with the adhesive layer. As mentioned above, the polarizing film A with an adhesive layer of the present invention has a first polarizing film and a first adhesive layer.

The first polarizing film generally has a polarizing element and a protective film on one or both sides of the polarizing element. The polarizer is not particularly limited, and various polarizers can be used. Examples of polarizers include hydrophilic polymer films such as polyvinyl alcohol-based films, partially formalized polyvinyl alcohol-based films, and ethylene-vinyl acetate copolymer-based partially saponified films, which are uniaxially stretched after adsorbing iodine. . Among them, a polarizer composed of a polyvinyl alcohol-based film and iodine is more suitable. The thickness of these polarizers is not particularly limited, but is generally below about 80 μm.

In addition, from the viewpoint of heat resistance, it is preferable to use a polarizer with an iodine concentration of 6% by weight or less. From the viewpoint of heat resistance, the iodine concentration is preferably 5% by weight or less, more preferably 4% by weight or less. Furthermore, from the viewpoint of optical properties, the iodine concentration in the polarizer is preferably 1 wt% or more, more preferably 1.5 wt% or more, and more preferably 2 wt% or more. In addition, if the iodine concentration of the polarizer becomes higher, the dimensional changes will increase. The adhesion of the conductive structure caused by heating shrinkage will be insufficient, which may easily cause conduction failure. Therefore, the iodine concentration of the polarizer should be adjusted within the aforementioned range.

In addition, from the viewpoint of heat resistance, it is preferable to use a polarizer with a thickness greater than 10 μm. The aforementioned thickness should be greater than 10 μm and reach 25 μm, with 10 to 22 μm being preferred, and 10 to 20 μm being more preferred. In addition, the thicker the polarizer, the greater the dimensional change. Insufficient adhesion of the conductive structure caused by heating shrinkage may easily lead to poor conduction. Therefore, the thickness of the polarizer should be adjusted within the aforementioned range.

As a material constituting the protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, and the like can be used. Specific examples of the thermoplastic resin include cellulose resins such as cellulose triacetate, polyester resin, polyether resin, polyurethane resin, polycarbonate resin, polyamide resin, polyimide resin, polyamide resin, etc. Olefin resin, (meth)acrylic resin, cyclic Polyolefin resin (norbornene resin), polyarylate resin, polystyrene resin, polyvinyl alcohol resin and mixtures thereof. In addition, on one side of the polarizer, the protective film is bonded with an adhesive layer, and on the other side, the protective film can be (meth)acrylic, urethane, or acrylic urethane. , epoxy series, polysilicone series and other thermosetting resins or ultraviolet curing resins. The protective film may contain one or more types of any appropriate additives.

The material of the protective film (transparent protective film) is preferably cellulose resin or (meth)acrylic resin because it can control the change in the surface resistance value of the adhesive layer to a small level. In addition, it is preferable to use a (meth)acrylic resin having a lactone ring structure as the (meth)acrylic resin. Examples of the (meth)acrylic resin having a lactone ring structure include Japanese Patent Application Publication No. 2000-230016, Japanese Patent Application Publication No. 2001-151814, Japanese Patent Application Publication No. 2002-120326, and Japanese Patent Application Publication No. 2002-254544. , a (meth)acrylic resin having a lactone ring structure described in Japanese Patent Application Laid-Open No. 2005-146084, etc. In particular, cellulose resin is more effective than (meth)acrylic resin in suppressing cracks in polarizers that can cause problems in single-sided protective polarizing films, so it is better from this point of view.

As the protective film, a retardation film, a diffusion film, etc. can also be used. Examples of the retardation film include those having a front surface retardation of 40 nm or more and/or a thickness direction retardation of 80 nm or more. The frontal phase difference is usually controlled in the range of 40~200nm, and the thickness direction phase difference is usually controlled in the range of 80~300nm. When a retardation film is used as a protective film, the retardation film can also function as a polarizer protective film, so that the thickness can be reduced.

The aforementioned protective film and polarizer are laminated through an intermediary layer such as an adhesive layer, an adhesive layer, and a primer layer (primer layer). At this time, it is expected that the two can be laminated without air gaps through an interposer layer. It is preferable that the protective film and the polarizer are laminated through an adhesive. As long as the adhesive used for bonding the polarizer and the protective film is optically transparent, various forms including water-based, solvent-based, hot-melt adhesive-based, radical curing type, and cation curing type can be used without any particular restrictions. Of the adhesives, water-based adhesives or free radical hardening adhesives are more suitable.

<1st adhesive layer>

The first adhesive layer is formed from an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B).

The (meth)acrylic polymer (A) contains alkyl (meth)acrylate as a main component as a monomer unit. In addition, (meth)acrylate refers to acrylate and/or methacrylate, and (meth) in the present invention is also synonymous.

Examples of the alkyl (meth)acrylate constituting the main skeleton of the (meth)acrylic polymer (A) include linear or branched alkyl groups having 1 to 18 carbon atoms. For example, the aforementioned alkyl group may include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, cyclohexyl, heptyl, 2-ethylhexyl, isooctyl, and nonyl. , decyl, isodecyl, dodecyl, isomyristyl, lauryl, thirteenth, fifteenth, sixteenth, seventeenth, eighteenth, etc. These may be used alone or in combination. The average carbon number of the alkyl groups is preferably 3 to 9.

The weight ratio of the alkyl (meth)acrylate is preferably 70% by weight or more as a monomer unit in the weight ratio of the total monomers (100% by weight) constituting the (meth)acrylic polymer (A). . The aforementioned weight ratio of alkyl (meth)acrylate can be considered as the remaining portion of other comonomers. If the weight ratio of the alkyl (meth)acrylate is within the above range, it is preferable to ensure adhesion.

In order to improve the adhesion and heat resistance, in addition to the monomer unit of the alkyl (meth)acrylate, one or more types of compounds having specific properties may be introduced into the (meth)acrylic polymer (A) through copolymerization. Comonomer of polymerizable functional groups of unsaturated double bonds such as (meth)acryl group or vinyl group.

Examples of the copolymerizable monomer include functional group-containing monomers such as carboxyl group-containing monomers, hydroxyl group-containing monomers, and amide group-containing monomers.

Carboxyl-containing monosystem is a compound that contains carboxyl groups in its structure and contains polymerizable unsaturated double bonds such as (meth)acrylyl groups and vinyl groups. Specific examples of the carboxyl group-containing monomer include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, Crotonic acid, etc. From the viewpoint of copolymerizability, price and adhesive properties, acrylic acid is preferred among the aforementioned carboxyl group-containing monomers.

Hydroxyl-containing monosystem is a compound that contains hydroxyl groups in its structure and polymerizable unsaturated double bonds such as (meth)acrylyl groups and vinyl groups. Specific examples of the hydroxyl-containing monomer include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 6-(meth)acrylate. Hydroxyalkyl (meth)acrylate or (4- Hydroxymethylcyclohexyl)-methacrylate, etc. From the viewpoint of durability, among the aforementioned hydroxyl-containing monomers, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred, and 4-hydroxybutyl (meth)acrylate is particularly preferred. .

Carboxyl-containing monomers and hydroxyl-containing monomers will become reaction points with the cross-linking agent when the adhesive composition contains a cross-linking agent. Carboxyl group-containing monomers and hydroxyl group-containing monomers have good intermolecular reactivity with cross-linking agents, so they are suitable for improving the cohesion and heat resistance of the obtained first adhesive layer. Furthermore, from the viewpoint of both durability and heavy workability, a carboxyl group-containing monomer is preferable, and from the viewpoint of heavy workability, a hydroxyl group-containing monomer is preferable.

The aforementioned weight ratio of the carboxyl group-containing monomer is preferably 10% by weight or less, and preferably 0.01~8% by weight, more preferably 0.05~6% by weight, and even more preferably 0.1~5% by weight. The weight ratio of the carboxyl group-containing monomer is preferably 0.01% by weight or more from the viewpoint of durability. On the other hand, when it exceeds 10% by weight, it is unfavorable from the viewpoint of heavy workability.

The aforementioned weight ratio of the hydroxyl-containing monomer is preferably 3% by weight or less, and preferably 0.01~3% by weight, more preferably 0.1~2% by weight, and more preferably 0.2~2% by weight. From the viewpoint of crosslinking the first adhesive layer, durability or adhesive properties, the weight ratio of the hydroxyl-containing monomer is preferably 0.01% by weight or more. On the other hand, when it exceeds 3% by weight, it is unfavorable from the viewpoint of durability.

The amide group-containing monosystem is a compound that contains a amide group in its structure and contains polymerizable unsaturated double bonds such as (meth)acrylyl group and vinyl group. Specific examples of the amide group-containing monomer include (methyl)propyl Enamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(methyl)acrylamide )Acrylamide, N-butyl(meth)acrylamide, N-hexyl(meth)acrylamide, N-hydroxymethyl(meth)acrylamide, N-hydroxymethyl-N-propane (Meth)acrylamide, Aminomethyl(meth)acrylamide, Aminoethyl(meth)acrylamide, Mercaptomethyl(meth)acrylamide, Mercaptoethyl(meth)acrylamide Acrylamide-based monomers such as amines; N-acrylamides such as N-(meth)acrylamide, N-(meth)acrylylpiperidine, and N-(meth)acrylylpyrrolidine Heterocyclic monomers; N-vinyllactam-containing monomers such as N-vinylpyrrolidone, N-vinyl-ε-caprolactam, etc. The amide group-containing monomer is preferable in that it can suppress an increase in the surface resistance value over time (especially in a humidified environment) or satisfy durability. Especially among the amide group-containing monomers, it can suppress the increase in surface resistance value over time (especially in a humidified environment) or satisfy the durability of the transparent conductive layer (touch sensor layer). Monomers containing N-vinyl lactam are particularly preferred.

A large weight ratio of the amide group-containing monomer tends to reduce the anchoring property of the optical film. Therefore, the weight ratio is preferably 10% by weight or less, and more preferably 5% by weight or less. From the viewpoint of suppressing an increase in the surface resistance value over time (especially in a humidified environment), the aforementioned weight ratio of the amide group-containing monomer is preferably 0.1% by weight or more. The aforementioned weight ratio is preferably 0.3% by weight or more, more preferably 0.5% by weight or more. The amide group-containing monomer is suitable in view of its relationship with the ionic compound (B) contained in the first adhesive layer of the present invention.

In the adhesive composition used to form the first adhesive layer, when there is a amide group introduced into the side chain of the (meth)acrylic polymer (A) of the base polymer, through the amide group The presence of the amine group can suppress the change and increase in the surface resistance value of the first adhesive layer adjusted by blending the ionic compound (B) even in a humidified environment, thereby maintaining it at the desired value. Within the range, it seems better. We believe that the presence of the amide group in the side chain introduced into the (meth)acrylic polymer (A) as a functional group of the comonomer can improve the performance of the (meth)acrylic polymer (A). Compatibility with ionic compound (B).

Furthermore, the first adhesive layer has a (meth)acrylic-based polymer introduced into the base polymer. When the amide group in the side chain of compound (A) is present, the durability of both glass and transparent conductive layers (ITO layers, etc.) is good, and peeling or embossing can be suppressed while attached to the liquid crystal panel. wait. Moreover, the durability is still satisfactory in a humidified environment (after humidification reliability test).

In addition, as the comonomer, for example, aromatic ring-containing (meth)acrylate can be used. Aromatic ring-containing (meth)acrylate is a compound that contains an aromatic ring structure and a (meth)acrylyl group in its structure. Examples of the aromatic ring include a benzene ring, a naphthalene ring, and a biphenyl ring.

Specific examples of aromatic ring-containing (meth)acrylates include benzyl (meth)acrylate, phenyl (meth)acrylate, o-phenylphenol (meth)acrylate, and phenoxy (meth)acrylate. , Phenoxyethyl (meth)acrylate, Phenoxypropyl (meth)acrylate, Phenoxydiethylene 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 hydroxyethylated β-naphthalene Phenol acrylate, 2-naphthol ethyl (meth)acrylate, 2-naphthoxyethyl acrylate, 2-(4-methoxy-1-naphthyloxy)ethyl (meth)acrylate, etc. have naphthalene Ring substances; those with biphenyl rings such as (meth)acrylic acid biphenyl ester.

From the viewpoint of adhesive properties and durability, the aforementioned aromatic ring-containing (meth)acrylate is preferably benzyl (meth)acrylate, phenoxyethyl (meth)acrylate, and especially phenoxyethyl (meth)acrylate .

The aforementioned weight ratio of the aromatic ring-containing (meth)acrylate is preferably 25% by weight or less, and preferably 3% to 25% by weight, preferably 10% to 22% by weight, and more preferably 14% to 20% by weight. When the weight ratio of the aromatic ring-containing (meth)acrylate is 3% by weight or more, it is preferable from the viewpoint of suppressing display unevenness. On the other hand, if it exceeds 25% by weight, the suppression of display unevenness is insufficient, and the durability tends to decrease.

Specific examples of comonomers other than the above include acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; allylsulfonic acid and 2-(meth)acrylamide Sulfonic acid group-containing monomers such as 2-methylpropanesulfonic acid, (meth)acrylamide propanesulfonic acid, sulfopropyl (meth)acrylate; 2- Phosphate group-containing monomers such as hydroxyethylacrylyl phosphate, etc.

Examples of monomers intended for modification include amine ethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and tertiary butylamine ethyl (meth)acrylate. Alkylaminoalkyl (meth)acrylate and other acrylic esters; Alkoxyalkyl (meth)acrylate such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate Esters; N-(meth)acryloxymethylenesuccinimide or N-(meth)acryl-6-oxyhexamethylenesuccinimide, N-(meth)propylene Succinimide-based monomers such as acyl-8-oxyoctamethylenesuccinimide; N-cyclohexylmaleimide or N-isopropylmaleimide, N-laurylmaline Maleimide-based monomers such as leimide or N-phenylmaleimide; N-methylyconimide, N-ethylyconimide, and N-butyliconide Ikonimide, N-octylicotrimide, N-2-ethylhexylicotrimide, N-cyclohexylicotrimide, N-laurylicotrimide, etc. Imine monomers, etc.

In addition, vinyl-based monomers such as vinyl acetate and vinyl propionate; cyanoacrylate-based monomers such as acrylonitrile and methacrylonitrile; glycidyl (meth)acrylate, etc. can also be used as the modifying monomer. Containing epoxy (meth)acrylate; polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, methyl (meth)acrylate Diol-based (meth)acrylates such as oxypolypropylene glycol ester; tetrahydrofurfuryl (meth)acrylate, fluorine (meth)acrylate, polysiloxy (meth)acrylate or 2-methoxyethyl (meth)acrylate monomers such as acrylic acid esters, etc. Further examples include isoprene, butadiene, isobutylene, vinyl ether, etc.

Examples of copolymerizable monomers other than the above include silane-based monomers containing silicon atoms. Examples of the silane-based monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4- Vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloxydecyltrimethoxysilane, 10-propylene Cyloxydecyltrimethoxysilane, 10-methacryloxydecyltriethoxysilane, 10-acryloxydecyltriethoxysilane, etc.

In addition, as comonomers, tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, etc. can also be used. Alcohol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, bisphenol A diglycidyl ether di(meth)acrylate, neopentyl glycol di(meth)acrylate Acrylate, trimethylolpropane tri(meth)acrylate, neopentylerythritol tri(meth)acrylate, neopenterythritol tetra(meth)acrylate, dineopenterythritol penta(meth)acrylate Esterates of (meth)acrylic acid and polyols such as esters, dipenterythritol hexa(meth)acrylate, caprolactone-modified dipenterythritol hexa(meth)acrylate, etc. have more than 2 Polyfunctional monomers with unsaturated double bonds such as (meth)acrylyl and vinyl groups, or two or more (meth)acrylyl groups attached to the skeleton of polyester, epoxy, urethane, etc. Polyester (meth)acrylate, epoxy (meth)acrylate, urethane (meth)acrylate, etc., which have unsaturated double bonds such as vinyl as the same functional group as the monomer component.

In the weight ratio of the total monomers (100% by weight) of the (meth)acrylic polymer (A), the ratio of the other comonomers in the (meth)acrylic polymer (A) is preferably 0 ~10% by weight, preferably around 0~7% by weight, more preferably around 0~5% by weight.

The (meth)acrylic polymer (A) of the present invention usually has a weight average molecular weight of 1 million to 2.5 million. Considering durability, especially heat resistance, the weight average molecular weight is preferably 1.2 million to 2 million. From the viewpoint of heat resistance, it is appropriate if the weight average molecular weight is 1 million or more. In addition, if the weight average molecular weight exceeds 2.5 million, the adhesive tends to harden easily and peel off easily. In addition, the weight average molecular weight (Mw)/number average molecular weight (Mn) showing the molecular weight distribution is preferably 1.8 or more and 10 or less, more preferably 1.8 to 7, more preferably 1.8 to 5. If the molecular weight distribution (Mw/Mn) exceeds 10, it is unfavorable from the viewpoint of durability. In addition, the weight average molecular weight and molecular weight distribution (Mw/Mn) are measured in accordance with GPC (gel permeation chromatography) and are determined from values calculated in terms of polystyrene.

The (meth)acrylic polymer (A) can be produced by appropriately selecting a known production method such as solution polymerization, block polymerization, emulsion polymerization, and various radical polymerizations. Moreover, the obtained (meth)acrylic polymer (A) may be any of a random copolymer, a block copolymer, a graft copolymer, etc.

In addition, in solution polymerization, a polymerization solvent such as ethyl acetate, toluene, etc. can be used. As a specific example of solution polymerization, a polymerization initiator can be added to the reaction under a flow of inert gas such as nitrogen, and generally It is carried out under reaction conditions of about 50~70℃ and about 5~30 hours.

The polymerization initiator, chain transfer agent, emulsifier, etc. used for 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 usage amounts and reaction conditions of the polymerization initiator and chain transfer agent, and the usage amounts can be appropriately adjusted according to their types.

<Ionic compound (B)>

The ionic compound (B) contained in the adhesive composition forming the first adhesive layer of the present invention is a cationic component with a molecular weight of 210 or less. From the viewpoint of suppressing conduction failure caused by disconnection in a high-temperature environment, the molecular weight of the cationic component is more preferably 150 or less, more preferably 110 or less, more preferably 50 or less, and more preferably 10 or less. The larger the molecular weight of the cationic component is, the more it will hinder the entanglement of the (meth)acrylic acid polymers in the adhesive layer, thereby tending to soften the physical properties of the adhesive layer. Therefore, the smaller the molecular weight is, the less likely the physical properties of the first adhesive layer will become soft, and the smaller the molecular weight is, the more likely it is to suppress poor conduction caused by disconnection in a high-temperature environment. In addition, it is also preferable from this point of view that the smaller the molecular weight of the cationic component is, the easier it is to reduce the surface resistance value of the first adhesive layer and suppress electrostatic unevenness.

In addition, an alkali metal salt and/or an organic cation-anion salt can be suitably used as the ionic compound (B). As the alkali metal salt, organic salts and inorganic salts of alkali metal can be used. In addition, the "organic cation anion salt" in the present invention refers to an organic salt whose cation component is composed of an organic substance, and the anion component may be an organic substance or an inorganic substance. "Organic cation-anion salts" are also called ionic liquids and ionic solids. By making the first adhesive layer contain the ionic compound (B), the surface resistance value of the first adhesive layer can be reduced and the generation of static electricity can be suppressed. This can suppress the static electricity from disrupting the orientation of the liquid crystal layer and causing light leakage (charge failure). all).

<Alkali metal salt>

Examples of the alkali metal ions constituting the cation component of the alkali metal salt include lithium, sodium, and potassium ions. Among the alkali metal ions, lithium ions are preferred.

The anionic component of the alkali metal salt can be composed of organic matter or inorganic matter. Examples of the anionic component constituting the organic salt include 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 ^- , ^- O ₃ S(CF ₂ ) ₃ SO ₃ ^- , PF ₆ ^- , CO ₃ ^2- or the following general formula (1) to Those shown in (4): (1): (C _n F _2n+1 SO ₂ ) ₂ N ^- (but, n is an integer from 0 to 10), (2): CF ₂ (C _m F _2m SO ₂ ) ₂ N ^- (but, m is an integer from 1 to 10), (3): ^- O ₃ S(CF ₂ ) _l SO ₃ ^- (but, l is an integer from 1 to 10), (4): (C _p F _2p+1 SO ₂ )N ^- (C _q F _2q+1 SO ₂ ) (However, p and q are integers from 1 to 10).

In particular, anionic components containing fluorine atoms are suitable for use because an ionic compound with excellent ion dissociation properties can be obtained. As the anionic component constituting the 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. The anion component is preferably (CF ₃ SO ₂ ) ₂ N ^- , (C ₂ F ₅ SO ₂ ) ₂ N ^-, etc. (perfluoroalkylsulfonyl)imide represented by the aforementioned general formula (1), especially ( CF ₃ SO ₂ ) ₂ N ^- (trifluoromethanesulfonyl) acyl imine is suitable.

Specific examples of organic salts of alkali metals include sodium acetate, sodium alginate, sodium lignosulfonate, 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., among which 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 preferred, Li(CF ₃ SO ₂ ) ₂ N, Li(C ₂ F ₅ SO ₂ ) ₂ N, Li(C ₄ F ₉ SO ₂ ) ₂ Fluorine-containing lithium imide salts such as N and other bis(fluorosulfonyl)imide lithium salts are preferred, and (perfluoroalkylsulfonyl)imide lithium salts are particularly preferred. Others include 4,4,5,5-tetrafluoro-1,3,2-ditetrahydrothiazole-1,1,3,3-lithium tetraoxide salt and the like.

Examples of inorganic salts of alkali metals include lithium perchlorate and lithium iodide.

<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 aforementioned cation component is composed of organic matter. Specific examples of the cationic component include pyridinium cation Ion, piperidine cation, pyrrolidine cation, cation with dihydropyrrole skeleton, cation with pyrrole skeleton, imidazole cation, tetrahydropyrimidine cation, dihydropyrimidine cation, pyrazole cation, pyrazoline cation, tetraalkylammonium cation, trialkyl sulfonium cation, tetraalkyl phosphonium cation, etc.

Examples of the anionic component include 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 ^- , ^- O ₃ S(CF ₂ ) ₃ SO ₃ ^- or the following general formulas (1) to (4) Indicates: (1): (C _n F _2n+1 SO ₂ ) ₂ N ^- (but, n is an integer from 0 to 10), (2): CF ₂ (C _m F _2m SO ₂ ) ₂ N ^- (However, m is an integer from 1 to 10), (3): ^- O ₃ S(CF ₂ ) _l SO ₃ ^- (However, l is an integer from 1 to 10), (4): (C _p F _{2p+ 1} SO ₂ )N ^- (C _q F _2q+1 SO ₂ ) (However, p and q are integers from 1 to 10).

Among them, anionic components containing fluorine atoms are particularly suitable for use because an ionic compound with good ion dissociation properties can be obtained.

The organic cation-anion salt can be used by appropriately selecting a compound composed of a combination of the above-mentioned cation component and anion component. Preferred specific examples of organic cation-anion salts include methyltrioctylammonium bis(trifluoromethanesulfonyl)imide, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonate) acyl) acyl imine, ethylmethylimidazolium bis(fluorosulfonyl acyl imine). Among them, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide and ethylmethylimidazolium bis(fluorosulfonyl)imide are more preferred.

In addition to the aforementioned alkali metal salts and organic cation-anion salts, examples of the ionic compound (B) include ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride, ammonium sulfate, etc. of inorganic salts.

When the ionic compound (B) is an alkali metal salt, alkali metal ions such as lithium, sodium, and potassium are cationic components with a molecular weight of 210 or less. Therefore, alkali metal salts containing these alkali metal ions as cationic components can be suitably used. In particular, from the viewpoint of compatibility with the adhesive, an anion of an alkali metal salt is preferred. Organic salts of alkali metals composed of organic matter. Furthermore, the alkali metal ions are preferably lithium ions with the smallest molecular weight. The aforementioned ionic compound (B) is preferably a lithium salt, and an organic salt of lithium is particularly preferred. On the other hand, when the ionic compound (B) is an organic cation-anion salt, it is preferable to select a molecular weight of 210 or less from the cationic components exemplified above. Especially from the above viewpoint, it is preferable to use an organic cation-anion salt in which the anionic component is composed of an organic substance.

In order to obtain a desired resistance value, the aforementioned ionic compound (B) may be used alone or in combination of multiple types. Especially when the purpose is to control the surface resistance value of the first adhesive layer within the range of 1×10 ¹⁰ ~1×10 ¹² Ω/□, the aforementioned ionic compound (B) can improve the antistatic performance. From this point of view, alkali metal salts are preferred. By using alkali metal salts, an adhesive with high antistatic properties can be obtained even with a small blending ratio. On the other hand, when the purpose is to control the surface resistance value of the first adhesive layer within the range of 1×10 ⁸ ~1×10 ¹¹ Ω/□, the aforementioned ionic compound (B) can improve From the perspective of antistatic properties, organic cation-anion salts are preferred. By using organic cation-anion salts, an adhesive with high antistatic properties can be obtained even with a small blending ratio.

The ratio of the ionic compound (B) in the adhesive composition of the present invention should be appropriately adjusted to satisfy the antistatic properties of the first adhesive layer and the sensitivity of the touch panel. For example, in order to make the surface resistance value of the first adhesive layer fall into the range of 1.0×10 ⁸ ~1.0×10 ¹² Ω/□, it is advisable to consider the type of protective film of the polarizing film and the embedded touch sensing function. Adjust the ratio of ionic compound (B) according to the type of liquid crystal panel. For example, in the LCD panel with built-in touch sensing function shown in Figure 8, the initial surface resistance value of the first adhesive layer should be controlled in the range of 1×10 ⁸ ~1×10 ¹¹ Ω/□. In addition, when it is desired to control the conductivity of the first adhesive layer 2, from the viewpoint of antistatic performance and touch sensor sensitivity, the surface resistance value of the first adhesive layer 2 is preferably 1×10 ⁸ ~1×10 ¹² Ω/□, 1×10 ⁸ ~1×10 ¹¹ Ω/□ is better, 1×10 ⁸ ~1×10 ¹⁰ Ω is better.

If the amount of the ionic compound (B) increases, the ionic compound (B) may precipitate, which may cause humidification peeling. Furthermore, if the amount of the aforementioned ionic compound (B) increases, the surface resistance value may become too low and the There is a risk that the sensitivity of the touch panel will decrease due to baseline changes (malfunction during touch due to low surface resistance value). The ratio of the ionic compound (B), for example, relative to 100 parts by weight of the (meth)acrylic polymer (A), is generally preferably 40 parts by weight or less, more preferably 20 parts by weight or less, and 13 parts by weight or less. Better. If it is too little, there is a risk of poor antistatic properties. If it is too much, there is a risk of reduced touch sensitivity, precipitation of ionic compounds, and deterioration of humidification peeling of the adhesive. On the other hand, in order to improve the antistatic performance, it is preferable to use 0.1 parts by weight or more of the aforementioned ionic compound (B). From this viewpoint, the amount of the ionic compound (B) is preferably 1 part by weight or more, and more preferably 5 parts by weight or more.

The adhesive composition of the present invention may contain a cross-linking agent (C). As the cross-linking agent (C), an organic cross-linking agent or a polyfunctional metal chelate compound can be used. Examples of organic cross-linking agents include isocyanate cross-linking agents, peroxide cross-linking agents, epoxy cross-linking agents, imine cross-linking agents, and the like. Multifunctional metal chelates are covalent or coordination bonds between multivalent metals and organic compounds. Examples of polyvalent metal atoms include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti, etc. Examples of atoms in organic compounds that can be covalently or coordinately bonded include oxygen atoms, and examples of organic compounds include alkyl esters, alcohol compounds, carboxylic acid compounds, ether compounds, ketone compounds, etc.

The cross-linking agent (C) is preferably an isocyanate-based cross-linking agent and/or a peroxide-based cross-linking agent.

As the isocyanate cross-linking agent (C), a compound having at least two isocyanate groups can be used. For example, generally known aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates, etc. used in the urethanization reaction are used.

Peroxides can be used appropriately as long as they generate free radical active species when heated or irradiated with light to cross-link the base polymer of the adhesive composition. However, considering workability and stability, it is advisable to use a half-life temperature of 1 minute. Peroxide at 80℃~160℃, and it is more suitable to use peroxide at 90℃~140℃.

Peroxides that can be used include bis(2-ethylhexyl)peroxydicarbonate (1-minute half-life temperature: 90.6°C), bis(4-tertiary butylcyclohexyl)peroxydicarbonate (1 Minute half-life temperature: 92.1℃), di-secondary butyl peroxydicarbonate (1-minute half-life temperature: 92.4℃), tertiary butyl peroxyneodecanoate (1-minute half-life temperature: 103.5℃), trimethylperoxyacetate Grade hexyl ester (1-minute half-life temperature: 109.1°C), tertiary butyl peroxytrimethylacetate (1-minute half-life temperature: 110.3°C), dilauryl peroxide (1-minute half-life temperature: 116.4°C), Di-n-octyl peroxide (half-life temperature in 1 minute: 117.4℃), 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (half-life temperature in 1 minute: 124.3℃), Bis(4-methylbenzoyl)peroxide (half-life temperature in 1 minute: 128.2°C), diphenylbenzoyl peroxide (half-life temperature in 1 minute: 130.0°C), tertiary butyl perisobutyrate (half-life temperature in 1 minute: 136.1°C), 1,1-di(tertiary hexylperoxy)cyclohexane (half-life temperature in 1 minute: 149.2°C), etc. Among them, especially from the viewpoint of good cross-linking reaction efficiency, bis(4-tertiary butylcyclohexyl)peroxydicarbonate (half-life temperature of 1 minute: 92.1°C), dilauryl peroxide (1 minute Half-life temperature: 116.4°C), benzyl peroxide (half-life temperature in 1 minute: 130.0°C), etc. are suitable for use.

The usage amount of the cross-linking agent (C) is preferably 3 parts by weight or less relative to 100 parts by weight of the (meth)acrylic polymer (A), and is more preferably 0.01 to 3 parts by weight, and more preferably 0.02 to 2 parts by weight. parts, and more preferably 0.03~1 parts by weight. In addition, when the cross-linking agent (C) is less than 0.01 parts by weight, the first adhesive layer may not be cross-linked enough to meet the durability or adhesive properties; on the other hand, if it exceeds 3 parts by weight, the first adhesive layer may be Becomes too hard and has a tendency to reduce durability.

The adhesive composition of the present invention may contain a silane coupling agent (D). Durability can be improved by using silane coupling agent (D). Specific examples of the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, and 3-glycidoxypropylmethyl Diethoxysilane, 2-(3-4-epoxycyclohexyl)ethyltrimethoxysilane and other silane coupling agents containing epoxy groups; 3-aminopropyltrimethoxysilane, N-2-(amine Ethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethylbutylene)propylamine, N-phenyl-γ-aminepropylamine Silane coupling agents containing amine groups such as trimethoxysilane; 3-acryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, etc. containing (meth)acrylyl groups Silane coupling agent; 3-isocyanatepropyltriethoxysilane and other isocyanate-containing silicones Alkane coupling agent, etc. The silane coupling agent exemplified above is preferably a silane coupling agent containing an epoxy group.

In addition, the silane coupling agent (D) can also be used if it has a plurality of alkoxysilyl groups in the molecule. Specifically, X-41-1053, X-41-1059A, X-41-1056, X-41-1805, X-41-1818, X-41-1810, and wait. The silane coupling agent having multiple alkoxysilyl groups in the molecule is ideal because it is not volatile and has multiple alkoxysilyl groups, so it can effectively improve the durability. Especially when the adherend of the optical film with the adhesive layer is a transparent conductive layer (such as ITO, etc.) that is less likely to react with silicon alkoxide than glass, the durability is still good. In addition, the silane coupling agent having a plurality of alkoxysilyl groups in the molecule is preferably one having an epoxy group in the molecule, and it is more preferable that the epoxy group has a plurality of epoxy groups in the molecule. Silane coupling agents with multiple alkoxysilyl groups and epoxy groups in the molecule still tend to have good durability when the adherend is a transparent conductive layer (such as ITO, etc.). Specific examples of silane coupling agents having multiple alkoxysilyl groups and epoxy groups in the molecule include X-41-1053, X-41-1059A, and X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd., especially epoxy X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd., which has a large base content, is preferred.

The aforementioned silane coupling agent (D) can be used alone or in mixture of two or more kinds, but the total content is preferably 5 parts by weight or less based on 100 parts by weight of the aforementioned (meth)acrylic polymer (A), and It is preferably 0.001 to 5 parts by weight, more preferably 0.01 to 1 part by weight, more preferably 0.02 to 1 part by weight, and preferably 0.05 to 0.6 parts by weight. This is the amount that increases durability.

Furthermore, the adhesive composition of the present invention may also contain other well-known additives. For example, polyether compounds with reactive silicon groups, polyalkylene glycol polyether compounds such as polypropylene glycol, colorants, and pigments may be appropriately added depending on the intended use. Such as powders, 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, foils, etc. Alternatively, a redox system in which a reducing agent is added can be used within a controllable range. These additives are preferably used in a range of 5 parts by weight or less, more preferably 3 parts by weight or less, and more preferably 1 part by weight or less based on 100 parts by weight of the (meth)acrylic polymer (A).

The method of forming the first adhesive layer can be produced by, for example, the following method: applying the aforementioned adhesive composition to a release-treated separation member, etc., drying and removing the polymerization solvent, etc. to form the first adhesive layer and then transferring it. to an optical film (polarizing film); or a method of coating the aforementioned adhesive composition on an optical film (polarizing film) and then drying and removing the polymerization solvent to form a first adhesive layer on the optical film. In addition, when applying the adhesive, one or more solvents other than the polymerization solvent may be appropriately added.

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

From the viewpoint of ensuring durability and ensuring the contact area with the side conductive structure, the thickness of the first adhesive layer 2 is preferably 5 to 100 μm, preferably 5 to 50 μm, and more preferably 10 to 35 μm.

<Anchor layer>

The anchoring layer can be formed using a variety of materials. The thickness of the anchoring layer is preferably 0.01~0.5μm, more preferably 0.01~0.2μm, more preferably 0.01~0.1μm.

When it is desired to impart conductivity to the anchoring layer, from the viewpoint of antistatic performance, the surface resistance value is preferably 1×10 ⁶ ~1×10 ⁹ Ω/□. The conductive anchoring layer can be formed from various antistatic agent compositions. As the antistatic agent forming the anchor layer, ionic surfactant systems, conductive polymers, conductive fine particles, etc. are suitable.

From the viewpoints of optical properties, appearance, antistatic effect, and stability of the antistatic effect during heating and humidification, conductive polymers are preferably used as such antistatic agents. In particular, conductive polymers such as polyaniline and polythiophene are suitable. As the conductive polymer, those that are soluble in organic solvents, water-soluble, or water-dispersible can be appropriately used, but water-soluble conductive polymers or water-dispersible conductive polymers are preferably used. Because water-soluble conductive polymers or water-dispersible conductive polymers can be used to prepare the coating liquid when forming the antistatic layer into an aqueous solution or aqueous dispersion, the coating liquid can suppress optical films without using a non-aqueous organic solvent. The base material is deteriorated by the organic solvent. Moreover, the aqueous solution or aqueous dispersion may contain an aqueous solvent other than water. Examples include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, secondary butanol, tertiary butanol, normal Pentanol, isoamyl alcohol, secondary pentanol, tertiary pentanol, 1-ethyl-1-propanol, 2-methyl-1-butanol, n-hexanol, cyclohexanol and other alcohols.

In addition, the water-soluble conductive polymer or water-dispersible conductive polymer such as polyaniline and polythiophene preferably has a hydrophilic functional group in the molecule. Examples of hydrophilic functional groups include sulfonic acid group, amine group, amide group, imine group, quaternary ammonium salt group, hydroxyl group, mercapto group, hydrazine group, carboxyl group, sulfate group, phosphate group or salts thereof, etc. . Because it has hydrophilic functional groups in the molecule, it can be easily dissolved in water or can be easily dispersed in water in the form of fine particles, and the aforementioned 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 in terms of polystyrene: 150,000). Examples of commercially available water-dispersed conductive polymers include polythiophene-based conductive polymers (manufactured by Nagase ChemteX Co., trade name: Denatron series).

唑啉基聚合物、聚胺甲酸乙酯系樹脂、聚酯系樹脂、丙烯酸系樹脂、聚醚系樹脂、纖維素系樹脂、聚乙烯醇系樹脂、環氧樹脂、聚乙烯基吡咯啶酮、聚苯乙烯系樹脂、聚乙二醇、新戊四醇等。尤其以聚胺甲酸乙酯系樹脂、聚酯系樹脂、丙烯酸系樹脂為宜。該等黏結劑可依其用途適當使用1種或2種以上。 In addition, as for the material forming the anchor layer, a binder component may be added together with the antistatic agent for the purpose of improving the film-forming properties of the antistatic agent and the adhesion to the optical film. When the antistatic agent is a water-based 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 binders include

Oxazoline-based polymer, polyurethane resin, polyester resin, acrylic resin, polyether resin, cellulose resin, polyvinyl alcohol resin, epoxy resin, polyvinylpyrrolidone, Polystyrene resin, polyethylene glycol, neopentyl erythritol, etc. In particular, polyurethane resin, polyester resin, and acrylic resin are suitable. One or more types of these binders may be used appropriately depending on the purpose.

The amount of antistatic agent and adhesive used depends on their types, but it should be controlled so that the surface resistance of the anchor layer obtained is 1×10 ⁶ ~1×10 ⁹ Ω/□.

<Surface treatment layer>

As the aforementioned surface treatment layer, a hard coating layer, an anti-glare treatment layer, an anti-reflection layer, an anti-adhesion layer or an anti-glare treatment layer can be provided. Functional layer such as dazzling layer. The surface treatment layer may be provided on the surface of the protective film that is not attached to the polarizer.

In addition, when it is desired to control the conductivity of the surface treatment layer 4, from the viewpoint of antistatic performance and touch sensor sensitivity, the surface resistance value of the surface treatment layer 4 is preferably 1×10 ⁷ ~1×10 ¹¹ Ω/□, 1×10 ⁷ ~1×10 ¹⁰ Ω/□ is better, 1×10 ⁷ ~1×10 ⁹ Ω is better.

When it is desired to impart conductivity to the surface-treated layer, the surface-treated layer is preferably formed to have a surface resistance value of 1×10 ⁷ to 1×10 ¹¹ Ω/□. The surface treatment layer can be provided with conductivity by containing an antistatic agent. The surface treatment layer can be provided on the protective film used for the first polarizing film, or it can also be provided separately from the protective film. The antistatic agent used to impart conductivity to the surface treatment layer can be those exemplified above, but it is preferable to contain at least one selected from the group consisting of ionic surfactants, conductive fine particles, and conductive polymers. From the viewpoint of optical properties, appearance, antistatic effect, and stability of the antistatic effect during heating and humidification, the antistatic agent used in the surface treatment layer is preferably conductive fine particles.

The aforementioned surface treatment layer is preferably a hard coat layer. The hard coat layer may be formed of a material such as a thermoplastic resin or a material that can be cured by heat or radiation. Examples of the material include thermosetting resins, radiation curing resins such as ultraviolet curing resins and electron beam curing resins. Among them, an ultraviolet curable resin is preferred because the ultraviolet curable resin can efficiently form a cured resin layer with a simple processing operation through curing treatment using ultraviolet irradiation. Such hardening resins can include various resins such as polyester, acrylic, urethane, amide, polysiloxane, epoxy, melamine, etc., and include monomers and oligomers thereof. , polymers, etc. From the viewpoint of rapid processing speed and low heat loss to the base material, radiation-curable resin, especially ultraviolet curable resin, is suitable. Examples of ultraviolet curable resins that can be suitably used include those having ultraviolet polymerizable functional groups, including those containing an acrylic monomer or oligomer component having 2 or more such functional groups, particularly 3 to 6 such functional groups. . In addition, a photopolymerization initiator is blended with the ultraviolet curable resin.

In addition, the aforementioned surface treatment layer may be provided with an anti-glare treatment layer or an anti-reflection layer for the purpose of improving visibility. And an anti-glare treatment layer or an anti-reflective layer can be provided on the aforementioned hard coating layer. Anti-glare treatment The material constituting the layer is not particularly limited, and for example, radiation curing resin, thermosetting resin, thermoplastic resin, etc. can be used. Titanium oxide, zirconium oxide, silicon oxide, magnesium fluoride, etc. can be used as the anti-reflection layer. The anti-reflection layer can be provided with multiple layers. In addition, the surface treatment layer can also include an anti-adhesion layer.

The thickness of the aforementioned surface treatment layer can be appropriately set according to the type of surface treatment layer, and is generally 0.1 to 100 μm. For example, the thickness of the hard coating should be 0.5~20μm. The thickness of the hard coat layer is not particularly limited. However, if it is too thin, sufficient hardness as a hard coat layer cannot be obtained, and if it is too thick, cracking or peeling may easily occur. The thickness of the hard coating is preferably 1~10μm.

The amount of antistatic agent and adhesive (resin material, etc.) used in the surface treatment layer depends on the type. However, it is advisable to control the surface resistance value of the surface treatment layer to 1×10 ⁷ ~1×10 ¹¹ Ω. /□. Generally, relative to 100 parts by weight of the antistatic agent, the amount of the binder is preferably less than 1,000 parts by weight, and more preferably 10 to 200 parts by weight.

<Other layers>

For the polarizing film with an adhesive layer of the present invention, in addition to the above-mentioned layers, an easy-adhesion layer can also be provided on the surface of the first polarizing film on the side where the anchor layer is provided, or various easy-adhesion treatments such as corona treatment and plasma treatment can be performed. .

The liquid crystal cell B and the liquid crystal panel C will be described below.

(Liquid crystal unit B)

As shown in FIG. 3 , the liquid crystal cell B has a liquid crystal layer 20 , a first transparent substrate 41 and a second transparent substrate 42 sandwiching the liquid crystal layer 20 on both sides. The liquid crystal layer 20 contains parallel-oriented elements in the absence of an electric field. Liquid crystal molecules. In Figure 3, the electrodes in the liquid crystal cell B are omitted.

The liquid crystal layer 20 used in the liquid crystal cell B may use a liquid crystal layer containing liquid crystal molecules that are aligned in parallel in the absence of an electric field. As the liquid crystal layer 20, it is suitable to use, for example, an IPS liquid crystal layer. In addition, the liquid crystal layer 20 may be any type of liquid crystal layer such as TN type, STN type, π type, VA type, etc. The thickness of the liquid crystal layer 20 is, for example, about 1.5 μm to 4 μm.

Materials used to form the transparent substrate include glass or polymer films. Examples of the polymer film include polyethylene terephthalate, polycycloolefin, polycarbonate, and the like. When the transparent substrate is made of glass, its thickness is, for example, about 0.1 mm to 1 mm. When the transparent substrate is formed of a polymer film, its thickness is, for example, about 10 μm to 200 μm. The above-mentioned transparent substrate may have an easy-adhesion layer or a hard coat layer on its surface.

(Built-in liquid crystal unit B)

The aforementioned liquid crystal unit B can be a built-in type liquid crystal unit B shown in FIGS. 4 to 8 . In addition, the built-in liquid crystal unit B has a touch sensing electrode portion related to a touch sensor and a touch driving function between the first transparent substrate 41 and the second transparent substrate 42 .

As shown in FIG. 4 , FIG. 5 , and FIG. 8 , the aforementioned touch sensing electrode portion may be formed by using the touch sensor electrode 31 and the touch driving electrode 32 . The touch sensor electrodes referred to here are touch detection (receiving) electrodes. The aforementioned touch sensor electrodes 31 and touch driving electrodes 32 can be independently formed in various patterns. For example, when the built-in liquid crystal unit B is set as a plane, they can be arranged independently in the X-axis direction and the Y-axis direction in a right-angle staggered pattern. Furthermore, in FIGS. 4 , 5 , and 8 , the touch sensor electrode 31 is disposed closer to the first transparent substrate 41 (the viewing side) than the touch drive electrode 32 , but it may also be disposed on the first transparent substrate 41 side. On the contrary, the touch driving electrodes 32 are arranged on the side (the viewing side) of the first transparent substrate 41 than the touch sensor electrodes 31 .

On the other hand, as shown in FIGS. 6 and 7 , the touch sensing electrode portion may use an electrode 33 in which a touch sensor electrode and a touch driving electrode are integrated.

In addition, the touch sensing electrode portion may be disposed between the liquid crystal layer 20 and the first transparent substrate 41 or the second transparent substrate 42 . 4 and 6 show the case where the touch sensing electrode portion is arranged between the liquid crystal layer 20 and the first transparent substrate 41 (to the viewing side than the liquid crystal layer 20 ). 5 and 7 show the case where the touch sensing electrode portion is arranged between the liquid crystal layer 20 and the second transparent substrate 42 (toward the backlight side of the liquid crystal layer 20 ).

In addition, as shown in FIG. 8 , the touch sensing electrode portion has a touch sensor electrode 31 between the liquid crystal layer 20 and the first transparent substrate 41 , and between the liquid crystal layer 20 and the second transparent substrate 42 There are touch driving electrodes 32 between them.

In addition, the driving electrodes of the touch sensing electrode portion (the touch driving electrodes 32 , the touch sensor electrodes and the touch driving electrodes 33 formed integrally) can also be used as a common electrode for controlling the liquid crystal layer 20 .

As mentioned above, the built-in liquid crystal unit B has a touch sensor and a touch sensing electrode portion related to the touch driving function inside the liquid crystal unit, and does not have a touch sensor electrode outside the liquid crystal unit. That is, no conductive layer (surface resistance value) is provided on the side closer to the viewing side than the first transparent substrate 41 of the built-in liquid crystal unit B (and closer to the liquid crystal cell side than the first adhesive layer 2 of the built-in liquid crystal panel C). is 1×10 ¹³ Ω/□ or less). In addition, the built-in liquid crystal panel C shown in FIGS. 4 to 8 shows the order of each structure, but the built-in liquid crystal panel C may have other structures as appropriate. A color filter substrate may be provided on the liquid crystal unit (first transparent substrate 41).

The touch sensor electrode 31 (capacitive sensor) forming the touch sensing electrode part, the touch driving electrode 32, or the electrode 33 in which the touch sensor electrode and the touch driving electrode are integrated can be used as a transparent conductive layer And formed. The constituent materials of the aforementioned transparent conductive layer are not particularly limited, and may include metals such as gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, tungsten, and alloys of these metals. . In addition, the constituent materials of the transparent conductive layer include metal oxides of indium, tin, zinc, gallium, antimony, zirconium, and cadmium, and specifically include indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof. Metal oxides composed of etc. Other metal compounds composed of copper iodide, etc. can be used. The aforementioned metal oxides may further contain 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 suitable. ITO should contain 80~99% by weight of indium oxide and 1~20% by weight of tin oxide.

The electrodes of the aforementioned touch sensing electrode portion (touch sensor electrode 31, touch driving electrode 32. The electrode 33 in which the touch sensor electrode and the touch driving electrode are integrated can usually be formed in a transparent electrode pattern using a conventional method on the inside of the first transparent substrate 41 and/or the second transparent substrate 42 (built-in liquid crystal unit The liquid crystal layer 20 side in B). The above-mentioned transparent electrode pattern is usually electrically connected to a winding wire (not shown) formed at an end of the transparent substrate, and the above-mentioned winding wire is connected to a controller IC (not shown). In addition to the zigzag shape, the shape of the transparent electrode pattern can be any shape, such as stripe shape or rhombus shape, depending on the application. The height of the transparent electrode pattern is, for example, 10nm~100nm, and the width is 0.1mm~5mm.

(LCD panel C)

As shown in FIG. 3 , the liquid crystal panel C of the present invention can have a polarizing film A with an adhesive layer on the viewing side of the liquid crystal unit B, and a second polarizing film 11 on the opposite side. In addition, Figures 4 to 8 show a built-in liquid crystal panel using a built-in liquid crystal unit B.

The polarizing film A with the adhesive layer is disposed on the side of the first transparent substrate 41 of the liquid crystal unit B through the first adhesive layer 2 without interposing the conductive layer. On the other hand, the second polarizing film 11 is disposed on the side of the second transparent substrate 42 of the liquid crystal unit B through the second adhesive layer 12 . The first polarizing film 1 and the second polarizing film 11 of the polarizing film A with the adhesive layer are arranged on both sides of the liquid crystal layer 20 in such a manner that the transmission axes (or absorption axes) of their respective polarizers are orthogonal.

The second polarizing film 11 can use the ones described for the first polarizing film 1 . The second polarizing film 11 may be the same as the first polarizing film 1 or may be different.

The adhesive described in the first adhesive layer 2 can be used to form the second adhesive layer 12 . The adhesive used to form the second adhesive layer 12 may be the same as the first adhesive layer 2 or may be different. The thickness of the second adhesive layer 12 is not particularly limited, but is, for example, about 1 to 100 μm. It is preferably 2~50μm, more preferably 2~40μm, and more preferably 5~35μm.

In addition, in the liquid crystal panel C, as shown in FIG. 3 (FIG. 4 to FIG. 8), there is a conductive structure 50 on the side surface of the polarizing film A with the adhesive layer. In addition, as long as the conductive structure 50 is provided on the side of the first adhesive layer 2 containing the ionic compound, it is optional to provide the conductive structure on the side of the anchor layer 3 . again, In FIG. 3 (FIG. 4 to FIG. 8), in addition to the conductive structure 50, the conductive structure 51 is provided on the side surface of the surface treatment layer 4 and the first polarizing film 1. However, the conductive structure 51 is optional. When each layer is conductive, a conductive structure should be provided.

The conductive structures 51 and 50 can be disposed on the entire side surface of the polarizing film A with the adhesive layer, or can be disposed partially. When the conductive structure is partially provided, in order to ensure conduction on the side, the conductive structure should be disposed at a ratio of more than 1 area%, preferably more than 3 area%, of the side area. On the other hand, from the perspective of wiring, the conductive structure is preferably 99% or less of the area of the side surface, more preferably 95% or less of the area. The aforementioned conductive structures 51 and 50 are preferably disposed at at least point b shown in FIG. 2 (the aforementioned dimensional change is less than 400 μm ) on the side of the polarizing film A with the adhesive layer.

Through the conductive structures 51 and 50, the potential can be connected to other appropriate positions from the side of the polarizing film A with the adhesive layer, thereby suppressing the generation of static electricity. Materials for forming the conductive structures 51 and 50 include conductive pastes such as silver, gold or other metal pastes. In addition, conductive adhesives and any other appropriate conductive materials may also be used. The conductive structures 51 and 50 may also be formed in a line shape extending from the side surface of the polarizing film A on which the adhesive layer is attached.

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 combined with other optical films according to the suitability of each arrangement position. Use thin film lamination. The aforementioned other optical films include, for example, reflective plates or anti-transmission plates, retardation films (including 1/2 or 1/4 wavelength plates), viewing angle compensation films, brightness enhancement films, etc., which can be used to form liquid crystal display devices, etc. Optical layer. These can be used with 1 layer or more than 2 layers.

(Liquid crystal display device)

The liquid crystal display device using the liquid crystal panel C of the present invention can appropriately use components for forming the liquid crystal display device such as a backlight or a reflector in the lighting system.

Example

Hereinafter, the present invention will be specifically described with reference to production examples and working examples. However, the present invention is not limited by these examples. Example limitations. As for parts and % in each example, they are based on weight. Below, the room temperature storage conditions not specified are all 23℃ and 65%RH.

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

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

‧Analysis device: Made by Tosoh Corporation, HLC-8120GPC

‧Pipe string: Made by Tosoh Co., Ltd., G7000H _XL +GMH _XL +GMH _XL

‧Pipe string size: 7.8mm each, φ×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>

(Production of 40μmTAC film with HC and 25μmTAC film with HC)

A resin solution in which a UV-curable resin monomer or oligomer containing urethane acrylate as the main component is dissolved in butyl acetate (manufactured by DIC Co., Ltd., trade name: UNIDIC 17-806, solid content concentration: 80 %), add 5 parts of photopolymerization initiator (manufactured by BASF Co., Ltd., trade name: IRGACURE 907) and leveling agent (manufactured by DIC Co., Ltd., trade name:) for every 100 parts of the solid content in the solution. GRANDIC PC4100)0.1 part. Furthermore, cyclopentanone and propylene glycol monomethyl ether were added to the aforementioned solution at a ratio of 45:55 so that the solid content concentration in the aforementioned solution became 36%, thereby producing a hard coat forming material. The prepared hard coat layer forming material was applied to TJ40UL (manufactured by Fujifilm, raw material: cellulose triacetate polymer, thickness: 40 μm) so that the thickness of the hard coat layer after hardening became 7 μm. And form a coating film. After that, the coating film was dried at 90°C for 1 minute, and a high-pressure mercury lamp was used to irradiate the coating film with ultraviolet rays with a cumulative light intensity of 300 mJ/cm ² to harden the coating film to form a hard coat (HC) to produce a 40 μm TAC film with HC. .

<Manufacturing Example 2>

(Production of 30μm acrylic film)

Into a 30L kettle-type reactor equipped with a stirring device, a temperature sensor, a cooling pipe, and a nitrogen inlet pipe, 8,000g of methyl methacrylate (MMA) and 2,000g of 2-(hydroxymethyl) were fed. Methyl acrylate (MHMA), 10,000g of 4-methyl-2-pentanone (methyl isobutyl ketone, MIBK), 5g of n-dodecanethiol, and while passing nitrogen through them, the temperature was raised to 105°C and After refluxing, 5.0 g of tertiary butyl peroxy isopropyl carbonate (Kayakarubon BIC-7, manufactured by KAYAKU AKZO CO., LTD.) was added as a polymerization initiator, and 10.0 g of tertiary butylperoxyisopropyl carbonate was added dropwise over 4 hours. A solution composed of grade butylperoxyisopropyl carbonate and 230g of MIBK was solution polymerized at about 105~120°C under reflux, and then matured for another 4 hours.

30 g of stearyl phosphate/octadecyl phosphate mixture (Phoslex A-18, manufactured by Sakai Chemical Industry Co., Ltd.) was added to the obtained polymer solution, and the process was carried out under reflux at about 90 to 120°C. 5 hours cyclization condensation reaction. Next, the obtained polymer solution was introduced into a vented twin-screw extruder (φ=29.75mm, L/D=30) at a processing speed of 2.0kg/h in terms of resin amount, and placed in the extruder. Further perform cyclization condensation reaction, devolatization and extrusion to obtain transparent pellets of the lactone ring-containing polymer. The vented twin-screw extruder has a sleeve temperature of 260°C and a rotation speed of 100 rpm. The pressure reduction degree is 13.3~400hPa (10~300mmHg), the number of rear vents is 1, and the number of front vents is 4.

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

The obtained pellets and acrylonitrile-styrene (AS) resin (TOYO AS AS20, manufactured by TOYO STYRENE CO., LTD.) were kneaded and extruded using a single-screw extruder (screw 30 mm φ) at a mass ratio of 90/10. Transparent pellets are thus obtained. The glass transition temperature of the resulting pellets was 127°C.

Using a 50mm φ single-screw extruder, the pellets were melt-extruded from a 400mm wide coat hanger T-shaped die to produce a film with a thickness of 120 μm. The produced film was stretched longitudinally to 2.0 times and transversely to 2.0 times at a temperature of 150° C. using a biaxial stretching device to obtain a stretched film (30 μm acrylic film) with a thickness of 30 μm. After measuring the optical properties of the stretched film, it was found that the total light transmittance was 93%, the in-plane phase difference Δnd was 0.8nm, and the thickness direction phase difference Rth was 1.5nm.

<Making polarizing film(1)>

A polyvinyl alcohol film with a thickness of 45 μm was dyed in an iodine solution with a concentration of 0.3% at 30°C for 1 minute between rollers with different speed ratios until it was extended 3 times. Thereafter, the film was stretched while being immersed in an aqueous solution containing 4% boric acid and 10% potassium iodide at 60° C. for 0.5 minutes until the total stretching ratio reached 6 times. Next, it was washed by immersing it in an aqueous solution containing 1.5% potassium iodide at 30° C. for 10 seconds, and then dried at 50° C. for 4 minutes to obtain a polarizing element with a thickness of 18 μm. Use a polyvinyl alcohol-based adhesive to laminate the saponified HC-attached 40 μm TAC film (triacetyl cellulose film side) obtained in Production Example 1 on one side of the polarizer, and laminate the product of Production Example 2 on the other side. 30μm acrylic film to produce a polarizing film (1).

<Making polarizing film(2)>

(Production of thin polarizer A)

Corona treatment is applied to one side of the base material of an amorphous isophthalic acid copolymer polyethylene terephthalate (IPA copolymer PET) film (thickness: 100 μm) with a water absorption rate of 0.75% and a Tg of 75°C, and the The corona-treated surface is coated at 25°C containing polyvinyl alcohol (degree of polymerization 4200, saponification degree 99.2 mol%) and acetate-acetyl-modified polyvinyl alcohol (degree of polymerization 1200, acetyl alcohol) in a ratio of 9:1. It is produced by drying an aqueous solution of acetoacetyl group modification degree 4.6% and saponification degree 99.0 mol% or more (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "Gohsefimer Z200") to form a polyvinyl alcohol-based resin layer with a thickness of 11 μm. Out of the layered body.

The obtained laminated body was advanced in the longitudinal direction (long side direction) between rollers with different circumferential speeds in an oven at 120°C. The free end of the line can be uniaxially extended by 2.0 times (air-assisted extension processing).

Next, the laminated body was immersed in an insolubilization bath (a boric acid aqueous solution in which 4 parts by weight of boric acid was mixed with 100 parts by weight of water) having a liquid temperature of 30°C for 30 seconds (insolubilization treatment).

Next, while immersing it in a dyeing bath with a liquid temperature of 30° C., the iodine concentration and the immersion time were adjusted so that the polarizing plate would have a predetermined transmittance. In this example, the material was immersed in an iodine aqueous solution in which 0.2 parts by weight of iodine and 1.0 parts by weight of potassium iodide were mixed with 100 parts by weight of water for 60 seconds (dyeing treatment).

Next, it was immersed in a crosslinking bath (a boric acid aqueous solution in which 3 parts by weight of potassium iodide and 3 parts by weight of boric acid were mixed with 100 parts by weight of water) with a liquid temperature of 30° C. for 30 seconds (crosslinking treatment). .

Thereafter, the laminated body was immersed in a boric acid aqueous solution with a liquid temperature of 70° C. (an aqueous solution obtained by blending 4 parts by weight of boric acid and 5 parts by weight of potassium iodide per 100 parts by weight of water), while rolling it on rollers with different peripheral speeds. The parts are uniaxially extended along the longitudinal direction (long side direction) so that the total extension ratio reaches 5.5 times (extension in water).

Thereafter, the laminated body was immersed in a cleaning bath (an aqueous solution in which 4 parts by weight of potassium iodide was mixed with 100 parts by weight of water) having a liquid temperature of 30° C. (washing treatment).

In the above manner, an optical film laminated body including a polarizer with a thickness of 5 μm was obtained.

(Making adhesives for transparent protective films)

Acrylic oligomer (ARUFON UP1190, manufactured by Toagosei Co., Ltd.) 10 obtained by polymerizing 45 parts by weight of acrylomorphine, 45 parts by 1,9-nonanediol diacrylate, and (meth)acrylic acid monomer. parts, 3 parts of photopolymerization initiator (IRGACURE 907, manufactured by BASF Corporation), and 1.5 parts of polymerization initiator (KAYACURE DETX-S, manufactured by Nippon Kayaku Co., Ltd.) were mixed to prepare an ultraviolet curable adhesive.

On the surface of the polarizer A of the above-mentioned optical film laminate, the above-mentioned ultraviolet curable adhesive was applied so that the thickness of the adhesive layer after curing would be 1 μm, and the HC-attached film obtained in the above-mentioned Production Example 1 was bonded. After the 25 μm TAC film (cellulose triacetate film side) is irradiated, ultraviolet rays are irradiated as active energy rays to harden the adhesive. Ultraviolet irradiation uses a metal halide lamp filled with gallium, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., bulb: V bulb, peak illumination: 1600mW/cm ² , cumulative irradiation dose 1000/mJ/cm ² (wavelength 380~440nm), and the ultraviolet illuminance was measured using the Sola-Check system manufactured by Solatell. Then, the amorphous PET base material is peeled off to produce a polarizing film (2) using a thin polarizer. The optical properties of the obtained polarizing film were a single transmittance of 42.8% and a polarization degree of 99.99%.

The iodine concentration of the polarizer of the polarizing film (1) obtained above was 3.2% by weight. Furthermore, the iodine concentration of the polarizer of the polarizing film (2) obtained above was 7.2% by weight. In addition, the iodine concentration (wt%) of the polarizer can be adjusted by, for example, immersing the polyvinyl alcohol film or polyvinyl alcohol layer in an iodine aqueous solution of a predetermined concentration for a predetermined time when manufacturing the polarizer. The iodine concentration of each polarizer of the polarizing film (1) shown in Table 2 is adjusted by changing the concentration of the iodine solution used to dye the polyvinyl alcohol film when preparing the polarizing film (1).

<Film thickness of polarizer>

The film thickness (μm) of the polarizer was measured using a spectroscopic film thickness meter MCPD-1000 (manufactured by Otsuka Electronics Co., Ltd.). The polarizer contained in the sample (the polarizing film (1) or (2) prepared above) is taken out by immersing the sample in a solvent to dissolve the polarizer protective film. For example, dichloromethane can be used as a solvent when the polarizer protective film is made of cellulose triacetate resin, and methyl ethyl ketone can be used when the polarizer protective film is made of acrylic resin. In addition, when the resin of the polarizer protective film provided on one side of the polarizer is different from the resin of the polarizer protective film provided on the other side, the above-mentioned solvent is used to dissolve each resin in sequence.

<Iodine concentration of polarizer>

The iodine concentration of the polarizer is measured by the following method. In addition, the polarizer contained in the sample is taken out by immersing the sample in a solvent to dissolve the polarizer protective film in the same manner as when measuring the film thickness of the polarizer.

(fluorescence X-ray measurement)

When measuring the iodine concentration of polarizers, the calibration curve method of fluorescence X-ray analysis is first used to quantify the iodine concentration. As the device, a fluorescence X-ray analysis device ZSX-PRIMUS IV (manufactured by Rigaku Co., Ltd.) was used. The value directly obtained by using the fluorescence X-ray analysis device is not the concentration of each element, but the fluorescence of the wavelength specific to each element. Light X-ray intensity (kcps). Therefore, in order to obtain the iodine concentration contained in the polarizer, a calibration curve must be used to convert the fluorescence X-ray intensity into concentration. The iodine concentration of the polarizing element in this manual etc. refers to the iodine concentration (% by weight) based on the weight of the polarizing element.

(Create a calibration curve)

Follow the following procedure to prepare a calibration curve.

1. Dissolve a known amount of potassium iodide into a polyvinyl alcohol aqueous solution to prepare seven types of polyvinyl alcohol aqueous solutions containing iodine of known concentrations. This polyvinyl alcohol aqueous solution was applied to polyethylene terephthalate, dried and then peeled off to prepare samples 1 to 7 of polyvinyl alcohol films containing iodine of a known concentration.

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

[Mathematical formula 1] Iodine concentration (% by 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 produced 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 taken as the peak value of the fluorescence X-ray spectrum. Furthermore, the film thickness of the produced 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 (μm) to calculate the fluorescence X-ray intensity per unit thickness of the film (kcps/μm). Table 1 shows the iodine concentration and fluorescence X-ray intensity per unit thickness of each sample.

[Table 1]

4. Based on the results shown in Table 1, take the fluorescent X-ray intensity per unit thickness (kcps/μm) of the polyvinyl alcohol (PVA) film as the horizontal axis, and take the iodine concentration (weight %: wt%) as the vertical axis, draw a calibration curve. The prepared calibration curve is shown in Figure 9. The mathematics of iodine concentration can be calculated from the fluorescence X-ray intensity per unit thickness of the polyvinyl alcohol film obtained from the calibration curve. The formula is determined as shown in mathematical formula 2. In addition, R2 in Figure 9 is the correlation coefficient.

[Mathematical formula 2] (iodine concentration) (weight %) = 14.474 × (fluorescence X-ray intensity per unit thickness of polyvinyl alcohol film) (kcps/μm)

(Calculation of iodine concentration in polarizer)

Divide the fluorescence X-ray intensity obtained by measuring the sample by the thickness to obtain the fluorescence X-ray intensity per unit thickness (kcps/μm). The fluorescent X-ray intensity per unit thickness of each sample was substituted into Mathematical Expression 2 to determine the iodine concentration.

Example 1

(Preparation of acrylic polymer (A))

Into a 4-neck flask equipped with a stirring blade, a thermometer, a nitrogen inlet pipe, and a cooler, add 77.9 parts of butyl acrylate, 16 parts of phenoxyethyl acrylate, 1 part of N-vinyl-2-pyrrolidone, and acrylic acid. 5 parts and C 0.1 part of monomer mixture of 4-hydroxybutyl enoate. And with respect to 100 parts of the aforementioned monomer mixture (solid content), 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator was fed together with 100 parts of ethyl acetate, and nitrogen gas was introduced while slowly stirring. After nitrogen substitution, the liquid temperature in the flask was maintained at around 55° C., and a polymerization reaction was performed for 8 hours to prepare a solution of an acrylic polymer with a weight average molecular weight (Mw) of 1.95 million and Mw/Mn = 3.9.

(Prepare adhesive composition)

With respect to 100 parts of the solid content of the acrylic polymer solution obtained above, 8 parts of lithium bis(trifluoromethanesulfonyl)acyl imide, isocyanate cross-linking agent (Coronate L manufactured by Tosoh Corporation, trimethylolpropane di 0.6 parts of toluyl isocyanate) and 0.1 part of benzoyl peroxide (NYPER BMT manufactured by Nippon Oils and Fats Co., Ltd.) to prepare an acrylic adhesive solution.

(Production of polarizing film with adhesive layer)

Next, the solution of the above-mentioned acrylic adhesive composition was applied to a polyethylene terephthalate film (release film) treated with a polysiloxy release agent so that the thickness of the dried adhesive layer became 20 μm. : Mitsubishi Chemical Polyester Film Co., Ltd., MRF38) on one side and dried at 155°C for 1 minute to form an adhesive layer on the surface of the separation film. Next, the adhesive layer formed on the release film is transferred to the acrylic film side of the polarizing film (1) produced above, thereby producing a polarizing film with an adhesive layer attached.

Examples 2 to 6, Comparative Examples 1 to 3

In Example 1, as shown in Table 2, the type of polarizing film and the type of ionic compound (B) used to prepare the adhesive composition were changed to those shown in Table 2. Otherwise, the process was the same as Example 1. In this way, a polarizing film with an adhesive layer is produced.

The following evaluation was performed on the polarizing films with adhesive layers obtained in the above examples and comparative examples. The evaluation results are listed in Table 2.

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

The surface resistance value of the adhesive layer is measured on the surface of the adhesive layer formed on the separation film. Certainly. The measurement was performed using MCP-HT450 manufactured by Mitsubishi Chemical ANALYTECH.

<Dimensional change>

The polarizing film with the adhesive layer was cut into 10 cm (absorption axis direction) × 10 cm (slow axis direction), and then attached to alkali-free glass (made by Corning Corporation), and the resultant was used as a sample. Put the sample into the heating testing machine at 85°C. After 500 hours, take out the sample and measure the difference from the position of the polarizing film with the adhesive layer attached before being put into the heating test machine to the position of the polarizing film with the adhesive layer attached after being put into the heating test, and use it as the dimensional change. The measurement is based on point a: the center point of the side in the same direction as the slow axis of the rectangular sample (shrinking in the direction of the absorption axis) and point b: the side in the same direction as the absorption axis of the rectangle (shrinking in the direction of the slow axis). Perform at the center point.

<ESD test after heating>

After the separation film is peeled off from the polarizing film with the adhesive layer, it is attached to the viewing side of the built-in liquid crystal unit as shown in Figure 7 (but without the anchoring layer). Then, apply silver paste with a width of 5 mm at point b on the side of the polarizing film with the adhesive layer to cover the hard coating, polarizing film, and adhesive layer. After drying, heat it at 85°C or The liquid crystal cell was stored at 95° C. for 120 hours, then taken out and connected to an external ground electrode. Then, the winding wiring (not shown) at the periphery of the transparent electrode pattern inside the built-in liquid crystal unit is connected to the controller IC (not shown) to create a liquid crystal display device with built-in touch sensing function. An electrostatic discharge gun was fired at the polarizing film surface of the liquid crystal display device under an applied voltage of 15 kV, and the time it took for the whitened part due to electricity to disappear was measured, and the judgment was made based on the following criteria.

(Evaluation Basis)

◎: Within 1 second.

○: More than 1 second and within 10 seconds.

△: More than 10 seconds to within 30 seconds.

×: More than 30 seconds.

<Polyene>

In a high-temperature and high-humidity environment, the single transmittance of the polarizing film laminate decreases. We speculate that polyethylenization of polyvinyl alcohol is responsible for this decrease. Polyene refers to -(CH=CH)n-, which will be formed in the polarizing film after heating. Polyene will significantly reduce the transmittance of polarizing films. Moreover, in a high-temperature and high-humidity environment, the polyvinyl alcohol-polyiodine complex will be destroyed and easily generate ^I- and _I2 . We speculate that the polyenization of polyvinyl alcohol occurs because iodine (I ₂ ) generated in a high-temperature and high-humidity environment and heating promote a dehydration reaction (Chemical Formula 1).

It is speculated that the polyvinyl alcohol-polyiodine complex present in the polarizer is destroyed by heating and the I ₂ produced forms a charge transfer complex (HO‧‧‧I ₂ ) with the OH group in the polyvinyl alcohol. After that, polyene is formed via the OI group.

<Evaluation of polyene>

The polarizing film with the adhesive layer was subjected to a heating test at 95°C for 500 hours, and the single transmittance of the sample was measured before and after. The change in the single transmittance ΔTs was calculated by the following formula.

△Ts=Ts(500)-Ts(0)

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

The sample was evaluated according to the following criteria.

(Evaluation Basis)

○: △Ts is 0 or more

×: △Ts is less than 0

In Table 2: BA represents butyl acrylate, PEA represents phenoxyethyl acrylate, AA represents acrylic acid, NVP represents N-vinyl-2-pyrrolidone, HBA represents 4-hydroxybutyl acrylate, and isocyanate represents isocyanate cross-linking. agent (CORONATE L, produced by Tosoh Co., Ltd., toluene trimethylolpropane diisocyanate), BPO represents benzoyl oxide (NYPER BMT produced by Nippon Oils and Fats Co., Ltd.), Li-TFSI represents bis(trifluoromethanesulfonyl) Lithium acyl imide, K-TFSI stands for potassium bis(trifluoromethanesulfonyl) acyl imide

EMP-TFSI stands for ethylmethylpyrrolidinium-bis(trifluorosulfonylcarboxylimide), TMPA-TFSI stands for trimethylpropylammonium-bis(trifluorosulfonylcarboxylic acid imide), TBMA-TFSI represents tributylmethylammonium-bis(trifluorosulfonylcarboxylimide), and MTOA-TFSI represents methyltricoctylammonium-bis(trifluorosulfonylcarbamateimide).

A: Polarizing film with adhesive layer

B: Liquid crystal unit (built-in liquid crystal unit)

C: LCD panel (built-in LCD panel)

1,11: 1st and 2nd polarizing film

2,12: 1st and 2nd adhesive layer

3: Anchor layer

4: Surface treatment layer

20: Liquid crystal layer

41,42: 1st and 2nd transparent substrate

50,51: conduction structure

Claims (8)

A liquid crystal panel, which has a liquid crystal unit and a polarizing film with an adhesive layer, and has a conductive structure on the side of the polarizing film with an adhesive layer. The liquid crystal unit has a liquid crystal layer and a first transparent layer sandwiching the liquid crystal layer on both sides. The substrate and the second transparent substrate, the liquid crystal layer contains liquid crystal molecules aligned in parallel in the absence of an electric field, and the polarizing film attached to the adhesive layer is disposed in the liquid crystal unit through the first adhesive layer without intervening the conductive layer. The side of the first transparent substrate on the viewing side; the liquid crystal panel is characterized in that: the aforementioned polarizing film with an adhesive layer has a first polarizing film and a first adhesive layer in sequence, and the aforementioned first polarizing film contains an iodine concentration of A polarizing element with a molecular weight of less than 6% by weight, and the first adhesive layer is composed of an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B) with a molecular weight of 210 or less as a cationic component. Form; the aforementioned conductive structure is selected to be set at the following position: when performing a dimensional shrinkage test of the aforementioned polarizing film with an adhesive layer under an environment of 85°C and 500 hours, the polarizing film with an adhesive layer is in the direction of the film surface. The dimensional change amount becomes point b on the side surface of 400 μm or less. Such as the liquid crystal panel of claim 1, wherein the aforementioned cationic component is lithium ion. A liquid crystal panel according to claim 1, which contains 1 to 13 parts by weight of the aforementioned ionic compound (B) relative to 100 parts by weight of the aforementioned (meth)acrylic polymer (A). The liquid crystal panel of claim 1, wherein the first polarizing film contains a polarizer with a thickness greater than 10 μm and less than 80 μm. The liquid crystal panel of claim 1, wherein the first polarizing film is a double-sided protective polarizing film having a polarizing element and protective films on both sides of the polarizing element. The liquid crystal panel of claim 1, wherein the liquid crystal unit is a built-in liquid crystal unit, and the built-in liquid crystal unit has a touch sensor between the first transparent substrate and the second transparent substrate. The touch sensing electrode part related to the device and touch driving function. The liquid crystal panel according to any one of claims 1 to 6, wherein there is a second polarizing film disposed through the second adhesive layer on the second transparent substrate side of the liquid crystal unit. A liquid crystal display device having a liquid crystal panel according to claim 7.