KR20210142655A - Liquid crystal panel and liquid crystal display device - Google Patents

Abstract

The present invention has a polarizing film (A) having a pressure-sensitive adhesive layer disposed through the first pressure-sensitive adhesive layer (2) without passing through the conductive layer on the visual recognition side of the liquid crystal cell (B), and has a conduction structure ( 51), wherein the polarizing film having an adhesive layer has a first polarizing film 1, an anchor layer 3, and a first adhesive layer in this order, the first polarizing film comprising: , a polarizer having an iodine concentration of 6% by weight or less, the anchor layer contains a conductive polymer, the first pressure-sensitive adhesive layer contains a (meth)acrylic polymer and an antistatic agent, and the conduction structure is a polarizing film having the pressure-sensitive adhesive layer. When the dimensional shrinkage test of 105 degreeC is performed in the environment of 500 hours, it is provided at least at the point on the side from which the amount of dimensional change in the film plane direction of the polarizing film which has the said adhesive layer will be 400 micrometers or less. The liquid crystal panel of the present invention has a good antistatic function, and can satisfy conduction reliability and durability in a high temperature region.

Description

Liquid crystal panel and liquid crystal display device

The present invention relates to a liquid crystal cell and a liquid crystal panel having a polarizing film provided with a predetermined pressure-sensitive adhesive layer on the visual recognition side of the liquid crystal cell. Moreover, it is related with the liquid crystal display device using the said liquid crystal panel. The liquid crystal display device using the liquid crystal panel of the present invention can be used together with an input device such as a touch panel applied on the viewing side of the liquid crystal display device, and can be used as various input display devices as a liquid crystal display device having a touch sensing function. can

In general, a liquid crystal display device has a polarizing film bonded to both sides of a liquid crystal cell through an adhesive layer from the image formation method. Moreover, it has been put to practical use to mount a touch panel on a display screen of a liquid crystal display device. As the touch panel, there are various methods such as a capacitive type, a resistive type, an optical type, an ultrasonic type, or an electromagnetic induction type, but a large number of the capacitive type is adopted. In recent years, a liquid crystal display device having a touch sensing function in which a capacitive sensor is incorporated as a touch sensor unit has been used.

On the other hand, in the manufacture of a liquid crystal display device, when the polarizing film having the pressure-sensitive adhesive layer is attached to the liquid crystal cell, the release film is peeled from the pressure-sensitive adhesive layer of the polarizing film having the pressure-sensitive adhesive layer, but static electricity is generated due to the peeling of the release film. do. Moreover, static electricity generate|occur|produces also when peeling the surface protection film of the polarizing film affixed to a liquid crystal cell, and peeling the surface protection film of a cover window. The static electricity generated in this way affects the alignment of the liquid crystal layer inside the liquid crystal display device and causes defects. Generation of static electricity can be suppressed by providing an antistatic layer in the outer surface of a polarizing film, for example.

On the other hand, the capacitance sensor in the liquid crystal display device having a touch sensing function detects the weak capacitance formed by the transparent electrode pattern and the finger when the user's finger approaches the surface thereof. When a conductive layer such as an antistatic layer is provided between the transparent electrode pattern and the user's finger, the electric field between the driving electrode and the sensor electrode is disturbed, the sensor electrode capacity is destabilized, the touch panel sensitivity is lowered, and a cause of malfunction becomes this In the liquid crystal display device with a touch sensing function, while suppressing the generation of static electricity, suppressing the malfunction of a capacitive sensor is calculated|required. For example, in the liquid crystal display device having a touch sensing function, an ^{antistatic layer having a surface resistance value of 1.0×10 9} to 1.0×10 ¹¹ Ω/□ in order to reduce the occurrence of display defects or malfunctions. It is proposed to arrange|position the polarizing film which has a liquid crystal layer on the visual recognition side (patent document 1). Moreover, disposing the polarizing film arrange|positioned on the visual recognition side through the adhesive layer containing an antistatic agent, the anchor layer containing a conductive polymer, etc. is proposed (patent document 2, 3).

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

According to the polarizing film which has an antistatic layer of patent document 1, generation|occurrence|production of static electricity to a certain extent can be suppressed. However, in patent document 1, since the arrangement|positioning location of an antistatic layer is away from the fundamental position which static electricity generate|occur|produces, it is not effective compared with the case where an antistatic function is provided to an adhesive layer. In addition, in a liquid crystal display device having a touch sensing function, by providing a conductive structure on the side surface of the polarizing film, conductivity from the side can be provided. However, when the antistatic layer is thin, the contact area with the conductive structure on the side surface is Since it was small, it turned out that sufficient electroconductivity was not obtained and conduction defect occurred. On the other hand, it was found that when the antistatic layer becomes thick, the touch sensor sensitivity decreases. In addition, the antistatic layer provided on the outer surface of the polarizing film does not obtain sufficient conductivity due to the need for adhesion with the conduction structure provided on the side surface under humidification or heating environment (after humidification or heating reliability test). could

On the other hand, according to the liquid crystal panel using the polarizing film which has an electroconductive adhesive layer etc. of patent documents 2 and 3, compared with patent document 1, electrostatic nonuniformity can be suppressed. In particular, high electroconductivity is calculated|required by the liquid crystal panel of the aspect which arrange|positions the polarizing film which has an adhesive layer without a conductive layer on the visual recognition side of a liquid crystal cell. However, when a liquid crystal panel is applied to a liquid crystal display device for in-vehicle use, since it is exposed to a higher temperature environment than when it is applied to a general television or mobile device, conductivity properties in a high temperature region are required, and Patent Document 2, Even with the liquid crystal panel as described in 3, it was not possible to satisfy the electrically conductive characteristic in a high temperature area|region. Moreover, durability in a high temperature region is calculated|required by the liquid crystal display device for vehicle-mounted use.

The present invention is a liquid crystal panel having a liquid crystal cell and a polarizing film having a pressure-sensitive adhesive layer applied to the viewing side thereof, has a good antistatic function, and is capable of satisfying conduction reliability and durability in a high temperature region. intended to provide

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

MEANS TO SOLVE THE PROBLEM As a result of repeating earnest examination in order to solve the said subject, the present inventors discovered that the said subject could be solved with the following liquid crystal panel, and came to complete this invention.

That is, the present invention provides a liquid crystal cell comprising a liquid crystal layer comprising liquid crystal molecules homogeneously aligned in the absence of an electric field, a first transparent substrate and a second transparent substrate supporting the liquid crystal layer by sandwiching the liquid crystal layer from both sides;

On the side of the first transparent substrate on the viewing side of the liquid crystal cell, a polarizing film having a pressure-sensitive adhesive layer disposed through a first pressure-sensitive adhesive layer without passing through a conductive layer, and further conducting to the side surface of the polarizing film having the pressure-sensitive adhesive layer It is a liquid crystal panel having a structure,

The polarizing film which has the said adhesive layer has a 1st polarizing film, an anchor layer, and a 1st adhesive layer in this order,

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

The anchor layer contains a conductive polymer,

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

When the dimensional shrinkage test of the polarizing film having the pressure-sensitive adhesive layer is performed under an environment of 105° C. and 500 hours, the conduction structure has a dimensional change of 400 μm or less in the film plane direction of the polarizing film having the pressure-sensitive adhesive layer. It relates to a liquid crystal panel characterized in that it is provided at least at the point b on the side to be used.

In the liquid crystal panel, it is preferable that the dimensional change amount of the point b at which the conduction structure is provided is 250 µm or less.

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

In the liquid crystal panel, the first pressure-sensitive adhesive layer preferably has a thickness of 1 to 100 µm and a surface resistance value of 1×10 ⁸ to 1×10 ¹² Ω/□.

Said liquid crystal panel WHEREIN: As said 1st polarizing film, the said polarizer and both protective polarizing films which have protective films on both surfaces of the said polarizer can be used.

The said liquid crystal panel WHEREIN: It is preferable that the said polarizer which the said 1st polarizing film contains is more than 10 micrometers in thickness.

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

In the liquid crystal panel, on the side of the second transparent substrate of the liquid crystal cell, it may have a second polarizing film disposed through a second pressure-sensitive adhesive layer.

Moreover, this invention relates to the liquid crystal display device which has the said liquid crystal panel.

As for the polarizing film which has an adhesive layer by the side of visual recognition in the liquid crystal panel of this invention, the adhesive layer containing an antistatic agent is provided in a polarizing film through the anchor layer containing a conductive polymer, and it is charged by these both layers. Prevention performance can be improved, and the polarizing film having the pressure-sensitive adhesive layer is in contact with the conduction structure from the side. Therefore, even when the polarizing film which has an adhesive layer is provided on the visual recognition side of a liquid crystal cell without passing through a conductive layer, conduction|electrical_connection in the side surface of the polarizing film which has the said adhesive layer is ensured, and generation|occurrence|production of static electricity nonuniformity by conduction|electrical_connection defect is prevented. can be suppressed

Although the conductive properties can be improved in both layers of the anchor layer and the pressure-sensitive adhesive layer as described above, the heat shrinkage of the polarizing film becomes remarkable in an environment of high temperature (especially over 100° C.), and the conductive paste forming the conductive structure is disconnected. and it was found that conduction failure is likely to occur. Further, since the heat shrinkage of the polarizing film can be controlled small by using a thin polarizer, the influence of the disconnection can be made small, but as the polarizer becomes thinner, the iodine concentration per thickness tends to increase, and in the thin polarizer, the iodine concentration becomes high, and when a thin polarizer is used, polyenization of the polarizer tends to occur in an environment of high temperature (especially over 100°C), and the optical properties are not sufficient.

In the present invention, as a polarizing film, a polarizing film having an iodine concentration of 6 wt% or less is used, and the conduction structure is a polarizing film having a pressure-sensitive adhesive layer. 400 μm or less), it is possible to satisfy the conduction reliability and durability in a high temperature region (particularly, over 100° C.).

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows an example of the polarizing film which has an adhesive layer used for the liquid crystal panel visual recognition side of this invention.
It is an example of the plan view conceptual diagram for demonstrating the state of the dimensional change before and behind shrinkage in the film plane direction of the polarizing film which has an adhesive layer used for the liquid crystal panel visual recognition side of this invention.
3 is a cross-sectional view showing an example of the liquid crystal panel of the present invention.
4 is a cross-sectional view showing an example of the in-cell liquid crystal panel of the present invention.
5 is a cross-sectional view showing an example of the in-cell liquid crystal panel of the present invention.
6 is a cross-sectional view showing an example of the in-cell liquid crystal panel of the present invention.
7 is a cross-sectional view showing an example of the in-cell liquid crystal panel of the present invention.
8 is a cross-sectional view showing an example of the in-cell liquid crystal panel of the present invention.
It is the calibration curve produced when calculating the iodine concentration of a polarizer.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated, referring drawings. Polarizing film A which has an adhesive layer used for the visual recognition side of the liquid crystal panel of this invention has the 1st polarizing film 1, the anchor layer 3, and the 1st adhesive layer 2 in this order. Moreover, the polarizing film A which has the said adhesive layer can have the surface treatment layer 4 on the visual recognition side of the 1st polarizing film 1 . 1 : has illustrated the case where it has the surface treatment layer 4, the 1st polarizing film 1, the anchor layer 3, and the 1st adhesive layer 2 in this order. In addition, although not described in FIG. 1, a separator can be provided in the 1st adhesive layer 2 of polarizing film A which has an adhesive layer of this invention, and a surface protection film can be provided in the surface treatment layer 4 .

Further, as the first polarizing film 1, one having a protective film on one side or both sides of the polarizer is used, but from the viewpoint of optical durability, a protective film on both sides rather than a single protective polarizing film having a protective film only on one side of the polarizer It is preferable to use both protective polarizing films which have (without drawing).

2 is a plane showing the state of the dimensional change before and after the shrinkage in the film plane direction before and after the input and after the polarizing film A having the pressure-sensitive adhesive layer in an environment of 105° C. for 500 hours and subjected to a dimensional shrinkage test. This is an example of the conceptual diagram seen in In FIG. 2, the polarizing film A' which has a polarizing film A which has an adhesive layer before the said injection|throwing-in, and the adhesive layer of the state which contracted after injection|throwing-in is shown. The amount of dimensional change of the polarizing film A which has an adhesive layer is the distance of the predetermined point of the side surface of the polarizing film A which has the said adhesive layer, and the side surface of polarizing film A' which has an adhesive layer, and a predetermined point. A conduction structure is provided at least at the point b where the said dimensional change amount is 400 micrometers or less. It is preferable that the said dimensional change amount is 350 micrometers or less, Furthermore, it is preferable that it is 300 micrometers or less, Furthermore, it is preferable that it is 250 micrometers or less, Furthermore, it is preferable that it is 200 micrometers or less.

About the polarizing film A which has an adhesive layer of FIG. 2, the point b is demonstrated about the relationship between an absorption axis direction and the direction (slow axis direction) orthogonal to an absorption axis. In the polarizing film A having an adhesive layer of FIG. 2, the distance (the amount of dimensional change in the slow axis direction) between the point b1 on the side surface in the same direction as the absorption axis direction and the point b1' of the polarizing film A' having an adhesive layer is the It is exemplified as a case where the dimensional change amount of 400 µm or less is satisfied. Moreover, in the polarizing film A which has an adhesive layer of FIG. 3, if 400 micrometers or less of dimensional change is satisfied with respect to point b1, also in each point of side b, it is thought that 400 micrometers or less of dimensional change is satisfied. In addition, in the polarizing film A having the pressure-sensitive adhesive layer of FIG. 3 , with respect to the deformed product processed on the corner of the rectangle, the point b2' on the side surface of the curve connecting the respective side surfaces in the absorption axis direction and the slow axis direction and the distance with the point b2' of polarizing film A' which has an adhesive layer is illustrated as a case where the said dimensional change amount satisfy|fills 400 micrometers or less.

On the other hand, in the polarizing film A having an adhesive layer of FIG. 2 , the distance between the point a on the side surface in the slow axis direction and the point a of the polarizing film A' having an adhesive layer (amount of dimensional change in the absorption axis direction) is the dimensional change It is exemplified as a case where 400 μm or less is not satisfied. Moreover, in the polarizing film A which has an adhesive layer of FIG. 3, if 400 micrometers or less of a dimensional change is satisfied with respect to the point a, also in each point of the side a, it is thought that 400 micrometers or less of a dimensional change cannot be satisfied.

Moreover, in the polarizing film A which has an adhesive layer of this invention, ratio (b/a) of the dimensional change amount b (micrometer) in the said point b and the dimensional change amount a (micrometer) in the absorption axis direction is less than 0.8 range It is preferable in terms of maintaining adhesion with the conduction structure provided on the side surface. 0.7 or less is preferable and, as for ratio (b/a), 0.6 or less is more preferable. In addition, the size in particular of the polarizing film (polarizing film A which has an adhesive layer) used by this invention is although it does not restrict|limit, For example, in a rectangular thing, the thing of 50-1500 mm in length and 50-1500 mm in width is suitable.

As for liquid crystal panel C of this invention, as shown in FIG. 3 by the said adhesive layer 2, the polarizing film A which has the said adhesive layer liquid crystal cell B (in-cell type liquid crystal cell B in FIGS. 4-8) It is arranged without passing through the conductive layer on the side of the first transparent substrate 41 on the viewing side. Moreover, in the said liquid crystal panel C, it has the conduction|electrical_connection structure 50 in the side surface of the polarizing film A which has the said adhesive layer.

<Polarizing film having an adhesive layer>

Below, the polarizing film A which has an adhesive layer is demonstrated. As mentioned above, the polarizing film A which has an adhesive layer of this invention has a 1st polarizing film, an anchor layer, and a 1st adhesive layer.

<First Polarizing Film>

As for a 1st polarizing film, what has a protective film on the single side|surface or both surfaces of a polarizer and this polarizer is generally used. A polarizer is not specifically limited, A various thing can be used. Examples of the polarizer include those obtained by adsorbing iodine to a hydrophilic polymer film such as a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, and a partially saponified ethylene/vinyl acetate copolymer film, and uniaxially stretching. have. Among these, the polarizer which consists of a polyvinyl alcohol-type film and iodine is suitable. Although the thickness in particular of these polarizers is not restrict|limited, Generally, it is about 80 micrometers or less.

Moreover, it is preferable from a heat resistant viewpoint to use the polarizer with an iodine concentration of 6 weight% or less as a polarizer. 5 weight% or less is preferable from a heat resistant viewpoint, and, as for the said iodine concentration, it is further more preferable that it is 4 weight% or less. Moreover, from a viewpoint of an optical characteristic, it is preferable that the iodine concentration in the said polarizer is 1 weight% or more, Furthermore, it is preferable that it is 1.5 weight% or more, Furthermore, it is preferable that it is 2 weight% or more. In addition, since the polarizer has a large amount of dimensional change when the iodine concentration increases, and conduction failure tends to occur due to insufficient adhesion of the conduction structure due to heat shrinkage, the iodine concentration of the polarizer is preferably adjusted within the above range.

Moreover, as a polarizer, it is preferable from a heat resistant viewpoint to use a polarizer with a thickness of more than 10 micrometers. The thickness is preferably more than 10 μm to 25 μm, further preferably 10 to 22 μm, and further preferably 10 to 20 μm. Further, the thicker the polarizer, the greater the amount of dimensional change, and since it is easy to cause conduction failure due to insufficient adhesion of the conduction structure due to heat shrinkage, the thickness of the polarizer is preferably adjusted within the above range.

As a material constituting the protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, and the like is used. Specific examples of such a thermoplastic resin include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, and (meth)acrylic resins. Resin, cyclic polyolefin resin (norbornene-type resin), polyarylate resin, polystyrene resin, polyvinyl alcohol resin, and these mixtures are mentioned. In addition, on one side of the polarizer, a protective film is bonded by an adhesive layer, but on the other side, as a protective film, a thermosetting resin such as (meth)acrylic, urethane, acrylic urethane, epoxy, silicone, or ultraviolet curable resin can be used. have. One or more types of arbitrary appropriate additives may be contained in a protective film.

As a material of the said protective film (transparent protective film), a cellulose resin and a (meth)acrylic resin are preferable at the point which can control small the fluctuation|variation of the surface resistance value of an adhesive layer. Moreover, as (meth)acrylic resin, it is preferable to use (meth)acrylic-type resin which has a lactone ring structure. As (meth)acrylic resin which has a lactone ring structure, Unexamined-Japanese-Patent No. 2000-230016, Unexamined-Japanese-Patent No. 2001-151814, Unexamined-Japanese-Patent No. 2002-120326, Unexamined-Japanese-Patent No. 2002-254544. (meth)acrylic-type resin which has a lactone ring structure as described in publication, Unexamined-Japanese-Patent No. 2005-146084, etc. are mentioned. In particular, compared with (meth)acrylic resin, a cellulose resin is preferable at the point effective in suppression of the polarizer crack used as a subject in a one-sided protection polarizing film.

As said protective film, retardation film, a diffusion film, etc. can also be used. As retardation film, what has a front retardation 40 nm or more and/or thickness direction retardation 80 nm or more of retardation is mentioned. A front retardation is normally controlled in the range of 40-200 nm, and thickness direction retardation is normally controlled in the range of 80-300 nm. When using retardation film as a protective film, since the said retardation film also functions as a polarizer protective film, thickness reduction can be aimed at.

The protective film and the polarizer are laminated through an intervening layer such as an adhesive layer, an adhesive layer, and an undercoat layer (primer layer). At this time, it is preferable to laminate both without an air gap by an intervening layer. The protective film and the polarizer are preferably laminated through an adhesive layer. The adhesive used for bonding the polarizer and the protective film is not particularly limited as long as it is optically transparent, and various types of water-based, solvent-based, hot-melt, radical-curable, and cation-curable adhesives are used, but water-based adhesives or radical-curable adhesives is suitable

<First pressure-sensitive adhesive layer>

The said 1st adhesive layer is formed from the adhesive composition containing a (meth)acrylic-type polymer (A) and an antistatic agent (B).

The (meth)acrylic polymer (A) contains, as a monomer unit, an alkyl (meth)acrylate as a main component. In addition, (meth)acrylate means an acrylate and/or a methacrylate, and has the same meaning as (meth) of this invention.

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

The weight ratio of the alkyl (meth)acrylate is preferably 70% by weight or more in the weight ratio of all monomers (100% by weight) constituting the (meth)acrylic polymer (A) as a monomer unit. The weight ratio of the said alkyl (meth)acrylate can be considered as the remainder of another copolymerization monomer. Setting the weight ratio of the alkyl (meth)acrylate within the above range is preferable in order to secure adhesiveness.

In the (meth)acrylic polymer (A), in addition to the monomer unit of the alkyl (meth)acrylate, polymerization having an unsaturated double bond such as a (meth)acryloyl group or a vinyl group for the purpose of improving adhesion and heat resistance One or more types of copolymerized monomers having a functional group of the same sex can be introduced by copolymerization.

As said copolymerization monomer, functional group containing monomers, such as a carboxyl group containing monomer, a hydroxyl group containing monomer, and an amide group containing monomer, can be illustrated, for example.

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

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

A carboxyl group containing monomer and a hydroxyl group containing monomer become reaction points with a crosslinking agent, when an adhesive composition contains a crosslinking agent. Since the carboxyl group-containing monomer and the hydroxyl group-containing monomer have high reactivity with the intermolecular crosslinking agent, they are preferably used for improving the cohesiveness and heat resistance of the obtained first pressure-sensitive adhesive layer. Moreover, a carboxyl group containing monomer is preferable at the point which makes durability and rework property compatible, and a hydroxyl group containing monomer is preferable from a viewpoint of rework property.

It is preferable that the said weight ratio of a carboxyl group containing monomer is 10 weight% or less, 0.01 to 8 weight% is preferable, Furthermore, 0.05 to 6 weight% is preferable, Furthermore, 0.1 to 5 weight% is preferable. It is preferable from a durable viewpoint that the weight ratio of a carboxyl group containing monomer shall be 0.01 weight% or more. On the other hand, when it exceeds 10 weight%, it is unpreferable from a viewpoint of rework property.

It is preferable that the said weight ratio of a hydroxyl-group containing monomer is 3 weight% or less, 0.01 to 3 weight% is preferable, Furthermore, 0.1 to 2 weight% is preferable, Furthermore, 0.2 to 2 weight% is preferable. It is preferable from a viewpoint of bridge|crosslinking a 1st adhesive layer, durability, and a viewpoint of adhesive characteristic that the weight ratio of a hydroxyl-group containing monomer shall be 0.01 weight% or more. On the other hand, when it exceeds 3 weight%, it is unpreferable from a durable viewpoint.

An amide group-containing monomer is a compound which contains an amide group in the structure, and also contains polymerizable unsaturated double bonds, such as a (meth)acryloyl group and a vinyl group. Specific examples of the amide group-containing monomer include (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N-isopropylacrylamide, N-methyl (meth) Acrylamide, N-butyl (meth) acrylamide, N-hexyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylol-N-propane (meth) acrylamide, aminomethyl (meth) acrylamide-based monomers such as acrylamide, aminoethyl (meth)acrylamide, mercaptomethyl (meth)acrylamide, and mercaptoethyl (meth)acrylamide; N-acryloyl heterocyclic monomers, such as N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, and N-(meth)acryloylpyrrolidine; and N-vinyl group-containing lactam-based monomers such as N-vinylpyrrolidone and N-vinyl-ε-caprolactam. An amide group-containing monomer is preferable in order to suppress the increase of the surface resistance value with time (especially in a humidified environment), or to satisfy durability. In particular, among the amide group-containing monomers, the N-vinyl group-containing lactam-based monomer suppresses an increase in the surface resistance value over time (especially in a humidified environment), and has durability to the transparent conductive layer (touch sensor layer). It is preferable to satisfy or

When the said weight ratio of an amide group containing monomer becomes large, since there exists a tendency for anchoring property to an optical film to fall, it is preferable that it is 10 weight% or less, and, as for the said weight ratio, it is especially preferable that it is 5 weight% or less. It is preferable that the said weight ratio of an amide group containing monomer is 0.1 weight% or more from a viewpoint of suppressing the increase of the surface resistance value with time (particularly in a humidified environment). 0.3 weight% or more is preferable, and, as for the said weight ratio, it is further more preferable that it is 0.5 weight% or more.

In the pressure-sensitive adhesive composition used for forming the first pressure-sensitive adhesive layer, when an amide group introduced into a side chain in the (meth)acrylic polymer (A) as a base polymer exists, the presence of the amide group causes the amide group to exist in a humidified environment. In addition, it is suppressed that the surface resistance value of the 1st adhesive layer adjusted by mix|blending an antistatic agent (for example, an ionic compound (B)) fluctuates and becomes large, and it is preferable in maintaining in the range of a desired value. It is thought that the compatibility between the (meth)acrylic polymer (A) and the ionic compound (B) increases due to the presence of an amide group introduced as a functional group of the copolymerization monomer into the side chain in the (meth)acrylic polymer (A).

In addition, when the amide group introduced into the side chain in the (meth)acrylic polymer (A) as the base polymer is present in the first pressure-sensitive adhesive layer, the durability is good for both glass and transparent conductive layers (ITO layer, etc.) And in the state affixed to the liquid crystal panel, generation|occurrence|production of peeling, a float, etc. can be suppressed. Moreover, durability can be satisfied also in a humidified environment (after a humidification reliability test).

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

As a specific example of aromatic ring containing (meth)acrylate, For example, benzyl (meth)acrylate, phenyl (meth)acrylate, o-phenylphenol (meth)acrylate phenoxy (meth)acrylate, phenoxyethyl ( Meth) acrylate, phenoxypropyl (meth) acrylate, phenoxy diethylene glycol (meth) acrylate, ethylene oxide modified nonylphenol (meth) acrylate, ethylene oxide modified cresol (meth) acrylate, phenol ethylene oxide modified (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, methoxybenzyl (meth) acrylate, chlorobenzyl (meth) acrylate, cresyl (meth) acrylate, polystyryl ( What has a benzene ring, such as meth)acrylate; Hydroxyethylated β-naphthol acrylate, 2-naphthoethyl (meth) acrylate, 2-naphthoxyethyl acrylate, 2-(4-methoxy-1-naphthoxy) ethyl (meth) acrylate, etc. What has a naphthalene ring; What has a biphenyl ring, such as biphenyl (meth)acrylate, is mentioned.

As said aromatic ring containing (meth)acrylate, from a viewpoint of adhesive characteristic and durability, benzyl (meth)acrylate and phenoxyethyl (meth)acrylate are preferable, and phenoxyethyl (meth)acrylate is especially preferable. .

It is preferable that the said weight ratio of aromatic ring containing (meth)acrylate is 25 weight% or less, 3 to 25 weight% is preferable, Furthermore, 10-22 weight% is preferable, Furthermore, 14 to 20 weight% is preferable. do. When the weight ratio of aromatic ring containing (meth)acrylate is 3 weight% or more, when suppressing display nonuniformity, it is preferable. On the other hand, when it exceeds 25 weight%, suppression of display nonuniformity is not enough on the contrary, and there exists a tendency for durability to fall.

As a specific example of other copolymerization monomers other than the above; acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; sulfonic acid group-containing monomers such as allylsulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid, and sulfopropyl (meth)acrylate; Phosphoric acid group containing monomers, such as 2-hydroxyethyl acryloyl phosphate, etc. are mentioned.

In addition, alkylaminoalkyl (meth)acrylates such as aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and t-butylaminoethyl (meth)acrylate; methoxyethyl (meth) alkoxyalkyl (meth)acrylates such as acrylate and ethoxyethyl (meth)acrylate; N-(meth)acryloyloxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, N-(meth)acryloyl-8-oxyoctamethylenesuccinimide, etc. succinimide-based monomers; maleimide-based monomers such as N-cyclohexyl maleimide, N-isopropyl maleimide, N-lauryl maleimide and N-phenyl maleimide; N-methylitaconimide, N-ethyl itaconimide, N-butyl itaconimide, N-octyl itaconimide, N-2-ethylhexyl itaconimide, N-cyclohexyl itaconimide Itaconimide type monomers, such as mide|mid and N-lauryl itaconimide, etc. are mentioned as a monomer example for the modification objective.

Examples of the modifying monomer include: vinyl-based monomers such as vinyl acetate and vinyl propionate; cyanoacrylate-based monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing (meth)acrylates such as glycidyl (meth)acrylate; glycol-based (meth)acrylates such as polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, methoxyethylene glycol (meth) acrylate, and methoxy polypropylene glycol (meth) acrylate; (meth)acrylate monomers, such as tetrahydrofurfuryl (meth)acrylate, a fluorine (meth)acrylate, silicone (meth)acrylate, and 2-methoxyethyl acrylate, etc. can also be used. Furthermore, isoprene, butadiene, isobutylene, vinyl ether, etc. are mentioned.

Moreover, as a monomer which can be copolymerized other than the above, the silane-type monomer containing a silicon atom, etc. are mentioned. Examples of the silane-based monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, and 8- Vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltri Ethoxysilane, 10-acryloyloxydecyl triethoxysilane, etc. are mentioned.

In addition, as a copolymerization monomer, tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6- hexanediol di(meth)acrylate, bisphenol A diglycidyl ether di(meth) Acrylate, neopentyl glycol di (meth) acrylate, trimethylol propane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) ) acrylate, dipentaerythritol hexa(meth)acrylate, caprolactone-modified dipentaerythritol hexa(meth)acrylate, etc. (meth)acrylic acid and polyhydric alcohol esterified (meth)acryloyl group, vinyl A polyfunctional monomer having two or more unsaturated double bonds such as a group, or a (meth)acryloyl group, a vinyl group, etc. as a functional group similar to the monomer component in a skeleton such as polyester, epoxy, urethane, etc. 2 unsaturated double bonds Polyester (meth)acrylate, epoxy (meth)acrylate, urethane (meth)acrylate, etc. added above can also be used.

The ratio of the other copolymerized monomers in the (meth)acrylic polymer (A) is about 0 to 10% by weight in the weight ratio of all constituent monomers (100% by weight) of the (meth)acrylic polymer (A), Furthermore, it is about 0 to 7 weight%, Furthermore, it is preferable that it is about 0 to 5 weight%.

It is preferable that the weight average molecular weights of the (meth)acrylic-type polymer (A) of this invention are 1 million - 2.5 million normally. When durability, especially heat resistance is considered, it is preferable that a weight average molecular weight is 1.2 million-2 million. It is preferable from a heat resistant viewpoint that a weight average molecular weight is 1 million or more. Moreover, when a weight average molecular weight becomes larger than 2.5 million, there exists a tendency for an adhesive to become hard easily, and it will become easy to generate|occur|produce peeling. Moreover, it is preferable that they are 1.8 or more and 10 or less, as for the weight average molecular weight (Mw)/number average molecular weight (Mn) which shows molecular weight distribution, it is further 1.8-7, Furthermore, it is preferable that it is 1.8-5. When the molecular weight distribution (Mw/Mn) exceeds 10, it is not preferable from the viewpoint of durability. In addition, a weight average molecular weight and molecular weight distribution (Mw/Mn) are measured by GPC (gel permeation chromatography), and are calculated|required from the value computed by polystyrene conversion.

For manufacture of such a (meth)acrylic-type polymer (A), well-known manufacturing methods, such as solution polymerization, block polymerization, emulsion polymerization, and various radical polymerization, can be selected suitably. In addition, any of a random copolymer, a block copolymer, a graft copolymer, etc. may be sufficient as the (meth)acrylic-type polymer (A) obtained.

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

The polymerization initiator, chain transfer agent, emulsifier, etc. used for radical polymerization are not specifically limited, It can select suitably and can use it. In addition, the weight average molecular weight of a (meth)acrylic-type polymer (A) is controllable with the usage-amount of a polymerization initiator and a chain transfer agent, and reaction conditions, The usage-amount is adjusted suitably according to these types.

<Antistatic agent>

Examples of the antistatic agent include materials capable of imparting antistatic properties such as ionic surfactants, conductive polymers, and conductive fine particles. Moreover, as an antistatic agent, an ionic compound can be used.

Examples of the ionic surfactant include cationic (eg, quaternary ammonium salt type, phosphonium salt type, sulfonium salt type, etc.), anionic type (carboxylic acid type, sulfonate type, sulfate type, phosphate type, phosphite type, etc.) ), zwitterionic (sulfobetaine type, alkylbetaine type, alkylimidazolium betaine type, etc.) or nonionic type (polyhydric alcohol derivative, β-cyclodextrin inclusion compound, sorbitan fatty acid monoester/diester, polyalkylene oxide) various surfactants such as seed derivatives and amine oxides.

Examples of the conductive polymer include polymers such as polyaniline, polythiophene, polypyrrole, and polyquinoxaline. Among them, polyaniline, polythiophene, etc., which easily form a water-soluble conductive polymer or a water-dispersible conductive polymer, are preferable. used Polythiophene is particularly preferred.

Examples of the conductive fine particles include metal oxides such as tin oxide, antimony oxide, indium oxide, and zinc oxide. Among these, a tin oxide system is preferable. As a tin oxide type thing, for example, in addition to tin oxide, antimony-doped tin oxide, indium-doped tin oxide, aluminum-doped tin oxide, tungsten-doped tin oxide, titanium oxide-cerium oxide-tin oxide composite, titanium oxide-tin oxide. and complexes of The average particle diameter of the fine particles is about 1 to 100 nm, preferably 2 to 50 nm.

In addition, as antistatic agents other than the above, acetylene black, Ketjen black, natural graphite, artificial graphite, titanium black, cationic type (quaternary ammonium salt, etc.), zwitterionic type (betaine compound, etc.), anionic type (sulfonate etc.) or a nonionic (glycerin, etc.) homopolymer of a monomer having an ionically conductive group, a copolymer of the monomer and another monomer, or a polymer having a moiety derived from an acrylate or methacrylate having a quaternary ammonium base. a polymer having; A permanent antistatic agent of the type in which a hydrophilic polymer such as a polyethylene methacrylate copolymer is alloyed with an acrylic resin or the like can be exemplified.

As an antistatic agent used for formation of a 1st adhesive layer, it is preferable to use an ionic compound also in the said illustration. As an ionic compound, the point of an antistatic function to an ionic liquid is preferable.

≪Ionic compound≫

Moreover, as an ionic compound, an alkali metal salt and/or an organic cation-anion salt can be used preferably. As the alkali metal salt, an organic salt or an inorganic salt of an alkali metal can be used. In addition, the "organic cation-anion salt" as used in this invention is an organic salt, the cation part shows that the organic substance is comprised, and an organic substance may be sufficient as an anion part, and an inorganic substance may be sufficient as it. An "organic cation-anion salt" is also said to be an ionic liquid and an ionic solid.

<Alkali metal salt>

Examples of the alkali metal ion constituting the cation moiety of the alkali metal salt include ions of lithium, sodium and potassium. Among these alkali metal ions, lithium ions are preferable.

The anion part of the alkali metal salt may be comprised from an organic substance, and may be comprised from an inorganic substance. Examples of the anion moiety 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 ^- , (FSO ₂ ) ₂ N ^- , -O ₃ S(CF ₂ ) ₃ SO ₃ ^- , PF ₆ ^- , CO ₃ ^2- B The following general formulas (1) to (4),

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

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

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

(4): (C _p F _2p+1 SO ₂ )N ^- (C _q F _2q+1 SO ₂ ) (provided that p and q are integers from 1 to 10), etc. are used. In particular, the anion moiety containing a fluorine atom is preferably used at the point that an ionic compound with good ionic dissociation property is obtained. Examples of the anion moiety constituting the inorganic salt include 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 ^- and the like are used. The anion moiety is preferably a (perfluoroalkylsulfonyl)imide represented by the general formula (1) such as (CF ₃ SO ₂ ) ₂ N ^- and (C ₂ F ₅ SO ₂ ) ₂ N ^-; In particular, (trifluoromethanesulfonyl)imide represented by _{(CF 3} SO ₂ ) ₂ N ^{− is preferable.}

Examples of an organic salt of an alkali metal, particularly, sodium acetate, sodium alginate, lignin sulfonate, toluene _{sulfonate, 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 and the like, and among them, 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, and Li(CF ₃ SO ₂ ) ₂ N, Li(C ₂ F ₅ SO ₂ ) ₂ N, Li(C ₄ F ₉ SO ₂ ) ₂ A fluorine-containing lithium imide salt such as N is more preferable, and a lithium (perfluoroalkylsulfonyl)imide salt is particularly preferable.

Moreover, lithium perchlorate and lithium iodide are mentioned as an inorganic salt of an alkali metal.

<Organic cation-anion salt>

The organic cation-anion salt used in the present invention is composed of a cation component and an anion component, and the cation component is composed of an organic material. As the cationic component, specifically, a pyridinium cation, a piperidinium cation, a pyrrolidinium cation, a cation having a pyrroline skeleton, a cation having a pyrrole skeleton, an imidazolium cation, a tetrahydropyrimidinium cation, a dihydropyri and a midinium cation, a pyrazolium cation, a pyrazolinium cation, a tetraalkylammonium cation, a trialkylsulfonium cation, and a tetraalkylphosphonium cation.

Examples of the anion 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 ^- , (FSO ₂ ) ₂ N ^- , -O ₃ S(CF ₂ ) ₃ SO ₃ ^- B General Formulas (1) to (4),

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

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

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

(4): (C _p F _2p+1 SO ₂ )N ^- (C _q F _2q+1 SO ₂ ) (provided that p and q are integers from 1 to 10), etc. are used. In particular, an anion component containing a fluorine atom is preferably used from the viewpoint of obtaining an ionic compound having good ionic dissociation properties.

Examples of the ionic compound include inorganic salts such as ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride and ammonium sulfate in addition to the alkali metal salts and organic cation-anion salts described above. These ionic compounds may be used alone or in combination.

As for the said ionic compound, it is preferable to use the thing whose molecular weight of a cation component is 210 or less from a viewpoint of the conduction|electrical_connection defect by disconnection in a high-temperature environment. Furthermore, it is preferable that the molecular weight of a cation component is 150 or less, Furthermore, it is preferable that it is 110 or less, Furthermore, it is preferable that it is 50 or less, Furthermore, it is preferable that it is 10 or less. The entanglement of (meth)acrylic polymers in an adhesive layer is inhibited, and there exists a tendency for the physical property of an adhesive layer to become soft, so that the molecular weight of the said cation component is large. Therefore, the physical properties of a 1st adhesive layer are hard to become flexible, so that the said molecular weight is small, and the conduction|electrical_connection defect by the disconnection in a high-temperature environment can be suppressed, so that the said molecular weight is small. Moreover, the said cationic component is preferable also from the point which suppresses electrostatic nonuniformity, so that the surface resistance value of a 1st adhesive layer becomes low easily, so that molecular weight is small.

When the ionic compound is an alkali metal salt, alkali metal ions such as lithium, sodium and potassium are cationic components having a molecular weight of 210 or less, so alkali metal salts having these alkali metal ions as the cation component can be suitably used. In particular, from the viewpoint of compatibility with the pressure-sensitive adhesive layer, an organic salt of an alkali metal in which the anion component of the alkali metal salt is constituted by an organic substance is preferable. Moreover, as said alkali metal ion, the lithium ion with the smallest molecular weight is preferable. As said ionic compound, lithium salt is suitable, and the organic salt of lithium is especially preferable. On the other hand, when the ionic compound is an organic cation-anion salt, one having a molecular weight of 210 or less may be selected from among the cationic components of the above examples. In particular, from the viewpoint of compatibility with the pressure-sensitive adhesive layer, an organic cation-anion salt in which the anion component is composed of an organic substance is preferable.

Although the usage-amount of the said adhesive and antistatic agent changes with those types, it is controlled so that ^{the surface resistance value of the 1st adhesive layer obtained may become 1x10 8} - 1x10 ^{12 Ω/□.} For example, it is preferable to use it in the range of 0.05-20 weight part of antistatic agents (for example, in the case of an ionic compound) with respect to 100 weight part of (meth)acrylic-type polymers. It is preferable to use an antistatic agent in 0.05 weight part or more at the point of improving antistatic performance. Furthermore, 0.1 weight part or more is preferable and, as for an antistatic agent (B), it is further more preferable that it is 0.5 weight part or more. In order to satisfy durability, it is preferable to use at 20 weight part or less, Furthermore, it is preferable to use at 10 weight part or less.

The ratio of the ionic compound (B) in the adhesive composition of this invention can be suitably adjusted so that the antistatic property of a 1st adhesive layer and the sensitivity of a touch panel may be satisfied. For example, the type of liquid crystal panel with built-in touch sensing function while considering the type of protective film of the polarizing film so that the surface resistance value of the first pressure-sensitive adhesive layer is in the range of 1.0×10 ⁸ to 1.0×10 ^{12 Ω/□} Accordingly, it is preferable to adjust the ratio of the ionic compound (B). For example, in the liquid crystal panel with a built-in touch sensing function of the in-cell type shown in FIG. 8 , the initial surface resistance value of the first pressure-sensitive adhesive layer is controlled in the range of ^{1×10 8} to 1×10 ^{12 Ω/□.} It is preferable to do this, and further, it is preferable to control in the range of ^{1×10 8} to 1×10 ^{11 Ω/□.}

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

As a crosslinking agent (C), an isocyanate type crosslinking agent and/or a peroxide type crosslinking agent are preferable.

As the isocyanate-based crosslinking agent (C), a compound having at least two isocyanate groups can be used. For example, well-known aliphatic polyisocyanates, cycloaliphatic polyisocyanates, aromatic polyisocyanates, etc. which are generally used in the urethanation reaction are used.

The peroxide can be appropriately used as long as it generates radically active species by heating or light irradiation to advance the crosslinking of the base polymer of the pressure-sensitive adhesive composition. It is preferable to use a peroxide, and it is more preferable to use a peroxide which is 90 degreeC - 140 degreeC.

As peroxides that can be used, for example, di(2-ethylhexyl)peroxydicarbonate (1 minute half-life temperature: 90.6° C.), di(4-t-butylcyclohexyl)peroxydicarbonate (1 minute half-life) Temperature: 92.1°C), di-sec-butylperoxydicarbonate (1 minute half-life temperature: 92.4°C), t-butylperoxyneodecanoate (1 minute half-life temperature: 103.5°C), t-hexylperoxy Pivalate (1 minute half-life temperature: 109.1°C), t-butylperoxypivalate (1 minute half-life temperature: 110.3°C), dilauroyl peroxide (1 minute half-life temperature: 116.4°C), di-n-octa Noyl peroxide (1-minute half-life temperature: 117.4°C), 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (1-minute half-life temperature: 124.3°C), di(4-methylbenzoyl) Peroxide (1-minute half-life temperature: 128.2 °C), dibenzoyl peroxide (1-minute half-life temperature: 130.0 °C), t-butylperoxyisobutyrate (1-minute half-life temperature: 136.1 °C), 1,1-di(t) -hexyl peroxy) cyclohexane (1 minute half-life temperature: 149.2 degreeC) etc. are mentioned. Among them, di(4-t-butylcyclohexyl)peroxydicarbonate (1-minute half-life temperature: 92.1°C), dilauroyl peroxide (1-minute half-life temperature: 116.4), in view of particularly excellent crosslinking reaction efficiency ℃), dibenzoyl peroxide (half-life temperature for 1 minute: 130.0°C) and the like are preferably used.

The amount of the crosslinking agent (C) used is preferably 3 parts by weight or less, more preferably 0.01 to 3 parts by weight, more preferably 0.02 to 2 parts by weight, further 0.03 with respect to 100 parts by weight of the (meth)acrylic polymer (A). to 1 part by weight is preferred. In addition, when the amount of the crosslinking agent (C) is less than 0.01 parts by weight, the first adhesive layer becomes insufficient in crosslinking, and there is a fear that durability and adhesive properties cannot be satisfied. On the other hand, when it is more than 3 parts by weight, the first adhesive layer is too hard. It shows a tendency to decrease durability.

A silane coupling agent (D) can be contained in the adhesive composition of this invention. Durability can be improved by using a silane coupling agent (D). Specific examples of the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2-(3, Epoxy group-containing silane coupling agent such as 4-epoxycyclohexyl)ethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-trie Amino group-containing silane coupling agent such as oxysilyl-N-(1,3-dimethylbutylidene)propylamine, N-phenyl-γ-aminopropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3- (meth)acryl group containing silane coupling agents, such as methacryloxypropyl triethoxysilane, isocyanate group containing silane coupling agents, such as 3-isocyanate propyl triethoxysilane, etc. are mentioned. As the silane coupling agent exemplified above, an epoxy group-containing silane coupling agent is preferable.

Moreover, as a silane coupling agent (D), what has a some alkoxysilyl group in a molecule|numerator can also be used. Specifically, for example, X-41-1053, X-41-1059A, X-41-1056, X-41-1805, X-41-1818, X-41-1810, X-40 manufactured by Shin-Etsu Chemical Co., Ltd. -2651 etc. are mentioned. The silane coupling agent which has a some alkoxysilyl group in these molecules is effective for durability improvement at the point which volatilizes hard to volatilize and has a plurality of alkoxysilyl groups, and is preferable. In particular, durability is suitable even in the case of a transparent conductive layer (for example, ITO etc.) where the to-be-adhered body of the optical film which has a pressure-sensitive adhesive layer is less likely to react with an alkoxysilyl group than that of glass. Moreover, it is preferable that it has an epoxy group in a molecule|numerator, and, as for the silane coupling agent which has a some alkoxysilyl group in a molecule|numerator, it is more preferable that it has two or more epoxy groups in a molecule|numerator. The silane coupling agent having a plurality of alkoxysilyl groups in the molecule and having an epoxy group tends to have good durability even when the adherend is a transparent conductive layer (eg, ITO or the like). As a specific example of the silane coupling agent which has a some alkoxysilyl group in a molecule|numerator and has an epoxy group, Shin-Etsu Chemical Co., Ltd. X-41-1053, X-41-1059A, X-41-1056 are mentioned, Especially, epoxy group content In many cases, X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd. is preferable.

The silane coupling agent (D) may be used alone or in mixture of two or more, but the content as a whole is 5 parts by weight or less with respect to 100 parts by weight of the (meth)acrylic polymer (A). It is preferable, further 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, further preferably 0.05 to 0.6 part by weight. amount that improves durability.

Further, the pressure-sensitive adhesive composition of the present invention may contain other known additives, for example, a polyether compound having a reactive silyl group, a polyether compound of polyalkylene glycol such as polypropylene glycol, a colorant, powder such as a pigment , dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, antioxidants, light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particulates, thin materials, etc. may be appropriately added depending on the intended use. In addition, within the controllable range, you may employ|adopt the redox system which added the reducing agent. It is preferable to use these additives in 5 weight part or less with respect to 100 weight part of (meth)acrylic-type polymer (A), Furthermore, 3 weight part or less, Furthermore, it is preferable to use it in 1 weight part or less.

As a method of forming the first pressure-sensitive adhesive layer, for example, the pressure-sensitive adhesive composition is applied to a peeling-treated separator, etc., the polymerization solvent is dried and removed to form the first pressure-sensitive adhesive layer, and then transferred to an optical film (polarizing film). It is produced by the method or the method of apply|coating the said adhesive composition to an optical film (polarizing film), drying-removing a polymerization solvent, etc., and forming a 1st adhesive layer on an optical film, etc. In addition, in application|coating of an adhesive, you may newly add 1 or more types of solvents other than a polymerization solvent suitably.

The thickness in particular of a 1st adhesive layer is not restrict|limited, For example, it is about 1-100 micrometers. Preferably, it is 2-50 micrometers, More preferably, it is 2-40 micrometers, More preferably, it is 5-35 micrometers.

The thickness of the first pressure-sensitive adhesive layer 2 is preferably 5 to 100 µm, preferably 5 to 50 µm, and further 10 to 35 µm from the viewpoint of ensuring durability and securing a contact area with the conduction structure on the side. It is preferable to be

<Anchor layer>

The anchor layer can be formed of various materials. It is preferable that the thickness of an anchor layer is 0.01-0.5 micrometer, It is preferable that it is 0.01-0.2 micrometer, It is more preferable that it is 0.01-0.1 micrometer.

The anchor layer contains a conductive polymer and has conductivity. ^{The surface resistance value is preferably 1×10 6} to 1×10 ⁹ Ω/□ from the viewpoint of the antistatic function.

A conductive polymer is preferably used from a viewpoint of stability at the time of heat and humidification of an optical characteristic, an external appearance, an antistatic effect, and an antistatic effect. In particular, conductive polymers such as polyaniline and polythiophene are preferably used. As the conductive polymer, an organic solvent-soluble, water-soluble, and water-dispersible one can be appropriately used, but a water-soluble conductive polymer or a water-dispersible conductive polymer is preferably used. For the water-soluble conductive polymer or water-dispersible conductive polymer, the coating liquid for forming the antistatic layer can be prepared as an aqueous solution or aqueous dispersion, and it is not necessary to use a non-aqueous organic solvent for the coating liquid, and the optical It is because the deterioration of a film base material can be suppressed. In addition, the aqueous solution or aqueous dispersion may contain an aqueous solvent other than water. For example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-amyl alcohol, isoamyl alcohol, sec-amyl alcohol, tert-amyl alcohol, 1- and alcohols such as ethyl-1-propanol, 2-methyl-1-butanol, n-hexanol and cyclohexanol.

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

As an example of the commercial item of a water-soluble conductive polymer, polyaniline sulfonic acid (The Mitsubishi Rayon company make, the weight average molecular weight 150000 by polystyrene conversion) etc. are mentioned. As an example of the commercial item of a water-dispersible conductive polymer, a polythiophene type conductive polymer (The Nagase Chemtex company make, brand name, Denatron series) etc. are mentioned.

Moreover, as a forming material of an anchor layer, a binder component can also be added with the said antistatic agent for the purpose of film formation of an antistatic agent, the improvement of the adhesiveness with respect to an optical film, etc. When the antistatic agent is an aqueous material of a water-soluble conductive polymer or a water-dispersible conductive polymer, a water-soluble or water-dispersible binder component is used. Examples of the binder include oxazoline group-containing polymers, polyurethane resins, polyester resins, acrylic resins, polyether resins, cellulose resins, polyvinyl alcohol resins, epoxy resins, polyvinylpyrrolidone, polystyrene resins, Polyethylene glycol, pentaerythritol, etc. are mentioned. In particular, a polyurethane-type resin, a polyester-type resin, and an acrylic resin are preferable. These binders can be used 1 type, or 2 or more types suitably according to the use.

Although the usage-amount of an antistatic agent and a binder changes with those types, it is preferable to control so that ^{the surface resistance value of the anchor layer obtained may become 1x10 6} - 1x10 ^{9 Ω/□.}

<Surface treatment layer>

As said surface treatment layer, functional layers, such as a hard-coat layer, a glare-treated layer, an antireflection layer, a sticking prevention layer thru|or an anti-glare layer, can be provided. The said surface treatment layer can be provided in the surface to which the polarizer of the said protective film is not adhere|attached.

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

When imparting conductivity to the surface treatment layer, the surface treatment layer is preferably formed so that the ^{surface resistance value is 1×10 6} to 1×10 ^{11 Ω/□.} Electroconductivity can be provided to the said surface treatment layer by containing an antistatic agent. A surface treatment layer can not only be provided in the protective film used for a 1st polarizing film, but can also be provided as a thing separate from a protective film separately. As the antistatic agent used for imparting conductivity to the surface treatment layer, those exemplified above can be used, but it is preferable to contain at least one selected from an ionic surfactant, conductive fine particles and a conductive polymer. As an antistatic agent used for a surface treatment layer, it is preferable that they are electroconductive microparticles|fine-particles from a viewpoint of stability at the time of an optical characteristic, an external appearance, an antistatic effect, and the heat|fever and humidification of an antistatic effect.

It is preferable that it is a hard-coat layer as said surface treatment layer. As a material for forming the hard coat layer, for example, a thermoplastic resin, a material hardened by heat or radiation can be used. As said material, radiation curable resin, such as thermosetting resin, ultraviolet curable resin, and electron beam curable resin, is mentioned. Among these, in the curing treatment by ultraviolet irradiation, an ultraviolet curable resin capable of efficiently forming a cured resin layer by a simple processing operation is suitable. As these curable resins, various things, such as a polyester type, acryl type, a urethane type, an amide type, a silicone type, an epoxy type, a melamine type, are mentioned, These monomers, an oligomer, a polymer, etc. are contained. A radiation-curable resin, particularly an ultraviolet-curable resin, is particularly preferable from the viewpoint of the speed of the processing speed and little heat damage to the substrate. The ultraviolet curable resin preferably used includes, for example, those containing an acrylic monomer or oligomer component having two or more, particularly three to six, of the functional group having an ultraviolet polymerizable functional group. Moreover, a photoinitiator is mix|blended with ultraviolet curable resin.

Moreover, as said surface treatment layer, the anti-glare treatment layer and antireflection layer for the purpose of improvement of visibility can be provided. Moreover, on the said hard-coat layer, an anti-glare process layer and a reflection prevention layer can be provided. It does not specifically limit as a structural material of an anti-glare treatment layer, For example, a radiation-curable resin, a thermosetting resin, a thermoplastic resin, etc. can be used. As the antireflection layer, titanium oxide, zirconium oxide, silicon oxide, magnesium fluoride, or the like is used. The antireflection layer can provide a plurality of layers. In addition, as a surface treatment layer, a sticking prevention layer etc. are mentioned.

Although the thickness of the said surface treatment layer can be set suitably according to the kind of surface treatment layer, it is generally preferable that it is 0.1-100 micrometers. For example, it is preferable that the thickness of a hard-coat layer is 0.5-20 micrometers. Although the thickness in particular of a hard-coat layer is not restrict|limited, When it is too thin, sufficient hardness as a hard-coat layer will not be acquired, On the other hand, when too thick, a crack and peeling will become easy to generate|occur|produce. The thickness of a hard-coat layer becomes like this. More preferably, it is 1-10 micrometers.

Although the amount of the antistatic agent and binder (resin material, etc.) used in the surface treatment layer varies depending on the types thereof, the surface resistance value of the surface treatment layer obtained is 1×10 ⁷ to 1×10 ¹¹ Ω/□. It is desirable to control it as much as possible. Usually, it is 1000 weight part or less of binder with respect to 100 weight part of antistatic agents, Furthermore, it is preferable that it is 10-200 weight part.

<Other floors>

In the polarizing film which has an adhesive layer of this invention, in addition to said each layer, an easily bonding layer is provided in the surface on the side which provides the anchor layer of a 1st polarizing film, or various adhesion-facilitating processes, such as a corona treatment and a plasma treatment. or can be done.

Below, the liquid crystal cell B and the liquid crystal panel C are demonstrated.

(liquid crystal cell B)

As shown in FIG. 3 , the liquid crystal cell B is a liquid crystal layer 20 including liquid crystal molecules homogeneously aligned in the absence of an electric field, and the liquid crystal layer 20 is sandwiched between both sides and supported by a first transparent It has a substrate 41 and a second transparent substrate 42 . In Fig. 3, the electrode in the liquid crystal cell B is omitted.

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

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

(In-cell liquid crystal cell B)

As said liquid crystal cell B, the in-cell type liquid crystal cell B shown in FIGS. 4-8 can be used. The in-cell liquid crystal cell B further has a touch sensor and a touch sensing electrode according to the function of touch driving between the first transparent substrate 41 and the second transparent substrate 42 .

The touch sensing electrode unit may be formed by a touch sensor electrode 31 and a touch driving electrode 32 as shown in FIGS. 4 , 5 and 8 . The touch sensor electrode here refers to a touch detection (reception) electrode. The touch sensor electrode 31 and the touch driving electrode 32 may be independently formed by various patterns. For example, when making the in-cell liquid crystal cell B into a plane, it can arrange|position in the pattern which cross|intersects at right angles by the form independently provided in an X-axis direction and a Y-axis direction, respectively. 4, 5, and 8, the touch sensor electrode 31 is disposed on the side (viewing side) of the first transparent substrate 41 rather than the touch drive electrode 32, but Conversely, the touch driving electrode 32 may be disposed on the side (viewing side) of the first transparent substrate 41 rather than the touch sensor electrode 31 .

Meanwhile, as shown in FIGS. 6 and 7 , the touch sensing electrode unit may use an electrode 33 in which a touch sensor electrode and a touch driving electrode are integrally formed.

In addition, the touch sensing electrode unit may be disposed between the liquid crystal layer 20 and the first transparent substrate 41 or the second transparent substrate 42 . 4 and 6 illustrate a case in which the touch sensing electrode unit is disposed between the liquid crystal layer 20 and the first transparent substrate 41 (on the viewing side of the liquid crystal layer 20 ). 5 and 7 show a case in which the touch sensing electrode unit is disposed between the liquid crystal layer 20 and the second transparent substrate 42 (on the backlight side of the liquid crystal layer 20).

In addition, as shown in FIG. 8 , the touch sensing electrode unit includes a touch sensor electrode 31 between the liquid crystal layer 20 and the first transparent substrate 41 , and includes the liquid crystal layer 20 and the first transparent substrate 41 . A touch driving electrode 32 may be provided between the two transparent substrates 42 .

In addition, the driving electrode (electrode 33 in which the touch driving electrode 32 , the touch sensor electrode and the touch driving electrode are integrally formed) in the touch sensing electrode part includes a common electrode for controlling the liquid crystal layer 20 . It can be used concurrently.

As described above, the in-cell liquid crystal cell B has a touch sensor and a touch sensing electrode according to a function of a touch driving in the liquid crystal cell, and does not have a touch sensor electrode outside the liquid crystal cell. That is, the conductive layer (surface resistance value is 1 × 10 ¹³ Ω/ □ and below) are not provided. In addition, in the in-cell liquid crystal panel C described in FIGS. 4-8, although the order of each structure is shown, in the in-cell liquid crystal panel C, you can have a different structure suitably. A color filter substrate can be provided on the liquid crystal cell (first transparent substrate 41).

The touch sensor electrode 31 (capacitive sensor), the touch drive electrode 32 , or the electrode 33 integrally formed with the touch sensor electrode and the touch drive electrode, which form the touch sensing electrode part, is formed as a transparent conductive layer. The constituent material of the transparent conductive layer is not particularly limited, and for example, metals such as gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, tungsten, and metals of these metals. alloy etc. are mentioned. Further, examples of the constituent material of the transparent conductive layer include metal oxides of indium, tin, zinc, gallium, antimony, zirconium, and cadmium, and specifically, indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof. The metal oxide which consists of etc. is mentioned. In addition, other metal compounds made of copper iodide or the like are used. The said metal oxide may further contain the oxide of the metal atom shown in the said group as needed. For example, indium oxide (ITO) containing tin oxide, tin oxide containing antimony, etc. are preferably used, and ITO is particularly preferably used. As ITO, it is preferable to contain 80 to 99 weight% of indium oxide and 1 to 20 weight% of tin oxide.

The electrode (the touch sensor electrode 31, the touch drive electrode 32, the touch sensor electrode, and the electrode 33 in which the touch drive electrode is integrally formed) of the touch sensing electrode part is usually a first transparent substrate 41 ) and/or on the inside of the second transparent substrate 42 (on the liquid crystal layer 20 side in the in-cell liquid crystal cell B), it can be formed as a transparent electrode pattern by a conventional method. The transparent electrode pattern is normally electrically connected to an arrangement wiring (not shown) formed at the end of the transparent substrate, and the arrangement wiring is connected to a controller IC (not shown). As for the shape of the transparent electrode pattern, in addition to the comb shape, any shape, such as a stripe shape or a rhombic shape, can be adopted according to the application. The height of the transparent electrode pattern is, for example, 10 nm to 100 nm, and the width is 0.1 mm to 5 mm.

(Liquid crystal panel C)

Liquid crystal panel C of this invention can have polarizing film A which has an adhesive layer on the visual recognition side of liquid crystal cell B as shown in FIG. 3, and can have 2nd polarizing film 11 on the opposite side. 4 to 8, an in-cell liquid crystal panel using the in-cell liquid crystal cell B is shown.

The polarizing film A having the pressure-sensitive adhesive layer is disposed on the side of the first transparent substrate 41 of the liquid crystal cell B through the first pressure-sensitive adhesive layer 2 without passing through the conductive layer. On the other hand, on the side of the second transparent substrate 42 of the liquid crystal cell B, the second polarizing film 11 is disposed through the second pressure-sensitive adhesive layer 12 . The transmission axis (or absorption axis) of each polarizer is orthogonal to the 1st polarizing film 1 in the polarizing film A which has the said adhesive layer, and the 2nd polarizing film 11 on both sides of the liquid crystal layer 20. arranged to do

As the 2nd polarizing film 11, what was demonstrated with the 1st polarizing film 1 can be used. The 2nd polarizing film 11 may use the thing similar to the 1st polarizing film 1, and may use a different thing.

For formation of the 2nd adhesive layer 12, the adhesive demonstrated with the 1st adhesive layer 2 can be used. As an adhesive used for formation of the 2nd adhesive layer 12, the thing similar to the 1st adhesive layer 2 may be used, and another thing may be used. The thickness in particular of the 2nd adhesive layer 12 is not restrict|limited, For example, it is about 1-100 micrometers. Preferably, it is 2-50 micrometers, More preferably, it is 2-40 micrometers, More preferably, it is 5-35 micrometers.

Moreover, in liquid crystal panel C, as shown to the side surface of the polarizing film A which has the said adhesive layer, it has the conduction|electrical_connection structure 50, as shown in FIG. 3 (FIG. 4-8). Moreover, the conduction structure 50 is provided in the side surface of the 1st adhesive layer 2 containing an antistatic agent, and the anchor layer 3 containing a conductive polymer. In addition, in FIG. 3 ( FIGS. 4 to 8 ), in addition to the conduction structure 50 , the case where the conduction structure 51 is provided on the side surfaces of the surface treatment layer 4 and the first polarizing film 1 is exemplified. , providing the conduction structure 51 is optional. It is preferable to provide a conduction|electrical_connection structure, when each layer has electroconductivity.

The conduction structures 51 and 50 are provided at least at the point b (the amount of dimensional change 400 micrometers or less) shown in FIG. 2 of the side surface of the polarizing film A which has the said adhesive layer. The conduction structures 51 and 50 should just be provided at at least one said point b, and may be provided in all the said side surfaces. When the conduction structure is provided in b, in order to ensure conduction at the side surface, the conduction structure uses the point b on the side surface as a reference (to include at least) 1 area% or more of the area of the side surface, preferably Preferably, it is provided in a ratio of 3 area% or more. On the other hand, from a viewpoint of wiring, it is preferable that the said conduction structure is 99 area% or less on the said side surface, Furthermore, it is preferable that it is 95 area% or less.

With the said conduction|electrical_connection structure 51 and 50, electrostatic generation|occurrence|production can be suppressed by connecting an electric potential to another suitable location from the side surface of the polarizing film A which has the said adhesive layer. As a material for forming the conductive structures 51 and 50, for example, a conductive paste such as silver, gold, or another metal paste can be used. In addition, a conductive adhesive or any other suitable conductive material can be used. The conduction structures 51 and 50 can also be formed in the linear shape extended from the side surface of the polarizing film A which has the said adhesive layer.

In addition, the 1st polarizing film 1 arrange|positioned on the visual recognition side of the liquid crystal layer 20, and the 2nd polarizing film 11 arrange|positioned on the opposite side to the visual recognition side of the liquid crystal layer 20 are the suitability of each arrangement location. Accordingly, other optical films may be laminated and used. As the other optical film, for example, a reflection plate, a transflective plate, a retardation film (including a wave plate such as 1/2 or 1/4), a visual compensation film, a luminance enhancing film, etc. for forming a liquid crystal display device What becomes an optical layer which may be used is mentioned. These can be used in one layer or two or more layers.

(liquid crystal display)

The liquid crystal display device using the liquid crystal panel C of this invention can use suitably the member which forms a liquid crystal display device, such as what used a backlight or a reflecting plate for an illumination system.

Example

Hereinafter, the present invention will be specifically described with reference to production examples and examples, but the present invention is not limited by these examples. In addition, all parts and % in each example are based on weight. Unless otherwise specified below, all room temperature leaving conditions are 23 degreeC and 65%RH.

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

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

Analysis device: Tosoh Corporation, HLC-8120GPC

·Column: Tosoh Corporation, G7000H _XL +GMH _XL +GMH _XL

·Column size: 7.8 mm φ × 30 cm each, 90 cm in total

·Column temperature: 40℃

Flow rate: 0.8 mL/min

・Injection amount: 100μL

·Eluent: tetrahydrofuran

Detector: Differential Refractometer (RI)

・Standard sample: polystyrene

<Production Example 1>

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

To a resin solution in which an ultraviolet curable resin monomer or oligomer containing urethane acrylate as a main component is dissolved in butyl acetate (manufactured by DIC Corporation, trade name: Unidic 17-806, solid content concentration: 80%), per 100 parts of solid content in the solution , 5 parts of a photopolymerization initiator (manufactured by BASF Corporation, trade name: IRGACURE907) and 0.1 part of a leveling agent (manufactured by DIC Corporation, trade name: GRANDIC PC4100) were added. And cyclopentanone and propylene glycol monomethyl ether were added to the said solution in the ratio of 45:55 so that the solid content concentration in the said solution might be set to 36 %, and the hard-coat layer forming material was produced. The produced hard-coat layer forming material was apply|coated on TJ40UL (made by Fuji Film, raw material: triacetyl cellulose polymer, thickness: 40 micrometers) so that the thickness of the hard-coat layer after hardening might be 7 micrometers, and the coating film was formed. Thereafter, the coating film is dried at 90° C. for 1 minute, and ultraviolet rays with an accumulated light amount of 300 mJ/cm 2 are irradiated to the coating film with a high-pressure mercury lamp, and the coating film is cured to form a hard coat layer (HC), 40 having HC A μm TAC film was fabricated.

<Production Example 2>

(Production of 30㎛ acrylic film)

In a 30 L shaping reactor equipped with a stirring device, a temperature sensor, a cooling tube, and a nitrogen inlet tube, 8,000 g of methyl methacrylate (MMA), 2,000 g of 2-(hydroxymethyl) methyl acrylate (MHMA), 10,000 g 4-methyl-2-pentanone (methyl isobutyl ketone, MIBK) and 5 g of n-dodecyl mercaptan were added, and the temperature was raised to 105° C. while passing nitrogen therethrough, and in the refluxed portion, a polymerization initiator 5.0 g of t-butylperoxyisopropyl carbonate (Kayacarbon BIC-7, manufactured by Kayakujo Co., Ltd.) was added, and 10.0 g of t-butylperoxyisopropyl carbonate and Solution polymerization was carried out at about 105 to 120°C under reflux while a solution composed of 230 g of MIBK was added dropwise over 4 hours, followed by further aging over 4 hours.

To the obtained polymer solution, 30 g of a stearyl phosphate/distearyl phosphate mixture (PhoslexA-18, manufactured by Sakai Chemical Co., Ltd.) was added, and a cyclization condensation reaction was carried out at about 90 to 120°C under reflux for 5 hours. did. Next, the obtained polymer solution was subjected to a barrel temperature of 260° C., a rotation speed of 100 rpm, a pressure reduction degree of 13.3 to 400 hPa (10 to 300 mmHg), a vent type screw twin-screw extruder (φ=29.75) with one rear vent and four pore vents. mm, L/D = 30), in terms of the amount of resin, introduced at a processing rate of 2.0 kg/h, further subjected to cyclization condensation reaction and devolatilization in this extruder, and extruded to transparent pellets of a lactone ring-containing polymer got

With respect to the obtained lactone ring containing polymer, when dynamic TG was measured, the mass decrease of 0.17 mass % was detected. Moreover, this lactone ring containing polymer had a weight average molecular weight of 133,000, a melt flow rate of 6.5 g/10min, and a glass transition temperature of 131 degreeC.

The obtained pellets and acrylonitrile-styrene (AS) resin (Toyo ASAS20, manufactured by Toyo Styrene Co., Ltd.) were kneaded and extruded using a single screw extruder (screw 30 mmφ) at a mass ratio of 90/10 to produce transparent pellets got it The glass transition temperature of the obtained pellets was 127 degreeC.

This pellet was melt-extruded from the coat hanger type T-die of a width|variety of 400 mm using a 50 mm diameter single screw extruder, and the film of thickness 120 micrometers was produced. A stretched film (30 µm acrylic film) having a thickness of 30 µm was obtained by stretching the produced film to 2.0 times in length and 2.0 times in width under 150°C temperature conditions using a biaxial stretching apparatus. When the optical properties of this stretched film were measured, the total light transmittance was 93%, the in-plane retardation Δnd was 0.8 nm, and the thickness direction retardation Rth was 1.5 nm.

<Preparation of polarizing film (1)>

The 45-micrometer-thick polyvinyl alcohol film was extended|stretched up to 3 times between rolls with different speed ratios, dyeing|staining for 1 minute in 30 degreeC and 0.3% density|concentration iodine solution. Then, the overall draw ratio extended|stretched to 6 times, immersing in the aqueous solution containing 60 degreeC, 4% concentration of boric acid, and 10% concentration of potassium iodide for 0.5 minute. Then, after washing|cleaning by being immersed for 10 second in 30 degreeC and the aqueous solution containing 1.5% of density|concentration potassium iodide, it dried at 50 degreeC for 4 minutes and obtained the 18-micrometer-thick polarizer. On one side of the polarizer, a 40 μm TAC film having saponified HC obtained in Production Example 1 (triacetyl cellulose film side) was placed on one side of the polarizer, and the 30 μm acrylic film obtained in Production Example 2 was placed on polyvinyl on the other side. It bonded with the alcohol-type adhesive agent, and the polarizing film (1) was produced.

<Production of polarizing film (2)>

(Production of thin polarizer A)

Amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 µm) having a water absorption rate of 0.75% and a Tg of 75 ° C. One side of the substrate is corona treated, and the corona treated side is coated with polyvinyl alcohol (polymerization degree). 4200, saponification degree 99.2 mol%) and acetacetyl-modified polyvinyl alcohol (polymerization degree 1200, acetacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Kose Chemical Co., Ltd., trade name "Gosepamer Z200") An aqueous solution containing a ratio of 1:1 was applied and dried at 25° C. to form a polyvinyl alcohol-based resin layer having a thickness of 11 μm to prepare a laminate.

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

Next, the laminate was immersed in an insolubilization bath (a boric acid aqueous solution obtained by blending 4 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30°C for 30 seconds (insolubilization treatment).

Then, it was immersed in the dyeing bath of 30 degreeC liquid temperature, adjusting an iodine concentration and immersion time so that a polarizing plate might become a predetermined|prescribed transmittance|permeability. In this example, 0.2 weight part of iodine was mix|blended with respect to 100 weight part of water, and it was made to immerse for 60 second in the iodine aqueous solution obtained by mix|blending 1.0 weight part of potassium iodide (dyeing process).

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

Thereafter, the laminate is immersed in an aqueous solution of boric acid at a liquid temperature of 70° C. (aqueous solution obtained by blending 4 parts by weight of boric acid with respect to 100 parts by weight of water and 5 parts by weight of potassium iodide) while immersing the laminate vertically between rolls with different peripheral speeds. Direction (uniaxial stretching was performed so that the total draw ratio in the longitudinal direction was 5.5 times (underwater stretching treatment)).

Then, the laminated body was immersed in the washing bath (aqueous solution obtained by mix|blending 4 weight part of potassium iodide with respect to 100 weight part of water with respect to 100 weight part of water) of 30 degreeC liquid temperature (washing process).

By the above, the optical film laminated body containing the 5 micrometers-thick polarizer was obtained.

(Production of adhesive applied to transparent protective film)

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

25 µm TAC film (triacetyl cellulose film) having HC obtained in Production Example 1, while applying the ultraviolet curable adhesive to the surface of the polarizer A of the optical film laminate so that the thickness of the adhesive layer after curing becomes 1 µm side) after bonding, ultraviolet rays were irradiated as an active energy ray to harden the adhesive. Ultraviolet irradiation was a gallium encapsulated metal halide lamp, irradiation apparatus: Light HAMMER 10 manufactured by Fusion UV Systems, Inc., valve: V valve, peak illuminance: 1600 mW/cm 2 , cumulative irradiation amount 1000/mJ/cm 2 (wavelength 380 to 440 nm ), and the illuminance of ultraviolet light was measured using a Sola-Check system manufactured by Solatell. Next, the amorphous PET base material was peeled off, and the polarizing film (2) using the thin polarizer was produced. The optical properties of the obtained polarizing film were 42.8% of single transmittance and 99.99% of polarization degree.

The iodine concentration of the polarizer regarding the polarizing film (1) obtained above was 3.2 weight%. In addition, the iodine density|concentration of the polarizer concerning the polarizing film (2) obtained above was 7.2 weight%. In addition, the iodine concentration (weight%) of a polarizer can be adjusted by immersing a polyvinyl alcohol-type film or a polyvinyl alcohol layer in the iodine aqueous solution of a predetermined concentration only for predetermined time at the time of manufacture of a polarizer, for example. The iodine concentration of each polarizer according to the polarizing film (1) shown in Table 2 was adjusted by changing the density|concentration of the iodine solution which dye|stains the polyvinyl alcohol film at the time of manufacturing 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 (polarizing film (1) or (2) prepared above) was taken out by immersing a sample in a solvent and dissolving a polarizer protective film. For the solvent, for example, when the polarizer protective film was a triacetyl cellulose film, dichloromethane was used, and when the polarizer protective film was an acrylic film, methyl ethyl ketone was used, respectively. In addition, when resin of the polarizer protective film provided on one surface of a polarizer and resin of the polarizer protective film provided on the other surface differ, each resin was sequentially melt|dissolved using the solvent mentioned above.

<Iodine concentration of polarizer>

The iodine concentration of a polarizer is measured with the following method. In addition, similarly to the time of measuring the film thickness of a polarizer, the polarizer contained in a sample immersed a sample in a solvent, and took it out by dissolving a polarizer protective film.

(fluorescence X-ray measurement)

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

(Creation of calibration curve)

A calibration curve was prepared in the following procedure.

1. A known amount of potassium iodide was dissolved in an aqueous polyvinyl alcohol solution to prepare seven polyvinyl alcohol aqueous solutions containing iodine having a known concentration. 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 having a known concentration.

In addition, the iodine density|concentration (weight%) of a polyvinyl alcohol film is computed by the following formula (1).

[Formula 1] Iodine concentration (wt%) = {Potassium iodide amount (g) / (Potassium iodide amount (g) + Polyvinyl alcohol weight (g))} x (127/166)

(The molecular weight of iodine: 127, the molecular weight of potassium: 39)

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

3. Divide the fluorescent X-ray intensity by the thickness (μm) of the polyvinyl alcohol film, and let it be the fluorescent 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.

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

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

(Calculation of iodine concentration in polarizer)

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

Example 1

<Preparation of the forming material of the conductive layer (anchor layer)>

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

(Preparation of a polarizing film having a conductive layer (anchor layer))

The said coating liquid for conductive layer formation was apply|coated so that the thickness after drying might be set to 0.06 micrometers on the acrylic film side of the said polarizing film (1), it was made to dry at 80 degreeC for 2 minutes, and the conductive layer was formed. In the obtained conductive layer, 8 weight% and 50 weight% of a thiophene type polymer and an oxazoline group containing acrylic polymer were contained, respectively.

(Preparation of acrylic polymer (A))

A monomer mixture containing 78.9 parts of butyl acrylate, 16 parts of phenoxyethyl acrylate, 5 parts of acrylic acid, and 0.1 part of 4-hydroxybutyl acrylate in a 4-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube and a cooler was put in. In addition, with respect to 100 parts of the monomer mixture (solid content), 0.1 parts of 2,2'-azobisisobutyronitrile as a polymerization initiator were added together with 100 parts of ethyl acetate, and nitrogen gas was introduced while gently stirring to replace nitrogen. Then, the liquid temperature in the flask was maintained at around 55°C, polymerization was performed for 8 hours, and an acrylic polymer solution having a weight average molecular weight (Mw) of 1.95 million and Mw/Mn = 3.9 was prepared.

(Preparation of adhesive composition)

1 part of trimethylpropylammonium-bis(trifluorosulfonylimide), 0.6 part of isocyanate crosslinking agent (Coronate L manufactured by Tosoh Corporation, trimethylolpropantolylene diisocyanate) with respect to 100 parts of solid content of the solution of the acrylic polymer obtained above and 0.1 parts of benzoyl peroxide (Nipper BMT manufactured by Nippon Yushi Corporation) were blended to prepare a solution of an acrylic pressure-sensitive adhesive composition.

(Preparation of a polarizing film having an adhesive layer)

Next, the solution of the acrylic pressure-sensitive adhesive composition was applied to one side of a polyethylene terephthalate film (separator film: Mitsubishi Chemical Polyester Film Co., Ltd., MRF38) treated with a silicone-based release agent so that the thickness of the pressure-sensitive adhesive layer after drying was 20 μm. It apply|coated, it dried at 155 degreeC for 1 minute, and formed the adhesive layer on the surface of the separator film. Next, the adhesive layer formed on the separator film was transcribed to the conductive layer (anchor layer) of the polarizing film 1 produced above, and the polarizing film which has an adhesive layer was produced.

Examples 2 to 5, Comparative Examples 1 to 3

In Example 1, as shown in Table 2, the kind of the polarizing film, the kind of antistatic agent (ionic compound (B)) used for preparation of the pressure-sensitive adhesive composition, or its blending ratio, and the thickness of the anchor layer are shown in Table 2 Except having changed as shown, it carried out similarly to Example 1, and produced the polarizing film which has an adhesive layer. When the said polarizing film (2) was used as a polarizing film, the said same conductive layer was formed in the surface (polarizer surface in which the 25 micrometers TAC film which has HC is not provided) of the polarizer of the said polarizing film (2). In Comparative Example 2, the conductive layer was not formed.

The following evaluation was performed about the polarizing film which has an adhesive layer obtained by the said Example and the comparative example. Table 2 shows the evaluation results.

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

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

The surface resistance value of an anchor layer was measured with respect to the anchor layer side surface of the polarizing film which has an anchor layer before forming an adhesive layer.

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

<Amount of Dimensional Change>

The polarizing film which has an adhesive layer was cut out to 10 cm (absorption axis direction) x 10 cm (slow axis direction), and what affixed on alkali-free glass (made by Corning Corporation) was made into the sample. The sample was put into a heating tester at 105°C. The sample was taken out after 500 hours, the difference of the polarizing film position which has the adhesive layer after heating test injection|throwing-in from the position of the polarizing film which has an adhesive layer before heat tester injection|throwing-in was measured, and it was set as the dimensional change amount. Measurements are made at a point a: the center point of a side surface (contraction in the direction of the absorption axis) in the same direction as the slow axis direction of the rectangular sample, and point b: the center of a side surface (contraction in the direction of the slow axis) in the same direction as the absorption axis direction of the rectangle. point was performed.

<ESD test after heating>

After the polarizing film having an adhesive layer is taken out after storage at 85°C or 105°C for 120 hours, and the separator film is peeled from the polarizing film having an adhesive layer, as shown in FIG. did. Next, 5 mm wide silver paste is applied to the point b of the side part of the polarizing film having the bonded adhesive layer to cover each side part of the hard coat layer, the polarizing film, the anchor layer, and the adhesive layer, and connected to the ground electrode from the outside did. In addition, the arrangement wiring (not shown) in the periphery of the transparent electrode pattern inside the in-cell liquid crystal cell was connected to the controller IC (not shown), and a liquid crystal display device with a built-in touch sensing function was manufactured. In the liquid crystal display device, an electrostatic discharge gun is fired at an applied voltage of 15 kV to the polarizing film surface, and the time until the white voided portion disappears by electricity is measured, and the following reference was judged as

(Evaluation standard)

(double-circle): less than 0.5 second.

(circle): More than 0.5 second - less than 1 second.

△: more than 1 second, within 5 seconds.

×: more than 5 seconds.

<Polyenization>

In a high-temperature, high-humidity environment, the single transmittance|permeability of a polarizing film laminated body falls. It is estimated that this fall is the cause of polyenization of polyvinyl alcohol. Polyene refers to -(CH=CH)n-, and can be formed in a polarizing film by heating. Polyene significantly lowers the transmittance of the polarizing film. In addition, under a high-temperature, high-humidity environment, the polyvinyl alcohol-polyiodine complex is destroyed, and I ^- and I ₂ are likely to be formed. Polyenization of polyvinyl alcohol is considered to occur by accelerating a dehydration reaction by heating _{with iodine (I 2} ) produced in a high-temperature, high-humidity environment (Formula 1).

[Formula 1]

_{I 2} generated when the polyvinyl alcohol-polyiodine complex present in the polarizer is destroyed by heating and OH groups in polyvinyl alcohol form a charge transfer complex (HO...I ₂ ), and then polyenized via OI group I think to do it.

<Evaluation of polyenization>

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

ΔTs=Ts(500)-Ts(0)

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

The samples were evaluated according to the following criteria.

(Evaluation standard)

○: ΔTs is 0 or more

×: ΔTs less than 0

<Durability Test>

The polarizing film having the produced pressure-sensitive adhesive layer was cut into a size of 300 × 220 mm so that the absorption axis of the polarizing film was parallel to the long side. The polarizing film which has the said adhesive layer was bonded together to the alkali-free glass (the Corning company make, brand name "EG-XG") of 350 x 250 mm x 0.7 mm thickness with a laminator. Then, it autoclaved at 50 degreeC and 0.5 MPa for 15 minutes, and made the adhesive layer closely_contact|adherent to glass. After the sample subjected to such treatment was treated for 500 hours in an atmosphere of 105° C., the appearance of the sample was evaluated by visual observation on the basis of the following criteria.

(Evaluation standard)

(double-circle): There is no change in appearance, such as foaming and peeling.

(circle): Although there is peeling or foaming at the edge part slightly, there is no problem practically.

(triangle|delta): Although there exists peeling or foaming at an edge part, unless it is a special use, there is no problem practically.

x: There is remarkable peeling at an edge part, and there exists a problem practically.

In Table 2,

BA is butyl acrylate,

PEA is phenoxyethyl acrylate,

AA is acrylic acid,

HBA is 4-hydroxybutyl acrylate,

The isocyanate type is an isocyanate crosslinking agent (Coronate L manufactured by Tosoh Corporation, trimethylolpropantolylene diisocyanate);

BPO is benzoyl peroxide (Nyper BMT manufactured by Nippon Yushi Corporation),

K-TFSI is potassium bis(trifluoromethanesulfonyl)imide,

Li-TFSI is bis(trifluoromethanesulfonyl)imide lithium,

TMPA-TFSI is trimethylpropylammonium-bis(trifluorosulfonylimide),

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

MTOA-TFSI is methyltrioctylammonium bis(trifluorosulfonylimide)

indicates

A: Polarizing film having an adhesive layer
B: liquid crystal cell (in-cell type liquid crystal cell)
C: liquid crystal panel (in-cell liquid crystal panel)
1, 11: first and second polarizing films
2, 12: first, second pressure-sensitive adhesive layer
3: anchor layer
4: surface treatment layer
20: liquid crystal layer
31: touch sensor electrode
32: touch driving electrode
33: touch driving electrode and sensor electrode
41, 42: first and second transparent substrates

Claims (9)

A liquid crystal cell comprising a liquid crystal layer comprising liquid crystal molecules homogeneously aligned in the absence of an electric field, a first transparent substrate and a second transparent substrate supporting the liquid crystal layer by sandwiching the liquid crystal layer from both sides;
On the side of the first transparent substrate on the viewing side of the liquid crystal cell, a polarizing film having a pressure-sensitive adhesive layer disposed through a first pressure-sensitive adhesive layer without passing through a conductive layer, and further conducting to the side surface of the polarizing film having the pressure-sensitive adhesive layer It is a liquid crystal panel having a structure,
The polarizing film which has the said adhesive layer has a 1st polarizing film, an anchor layer, and a 1st adhesive layer in this order,
The first polarizing film contains a polarizer having an iodine concentration of 6% by weight or less,
The anchor layer contains a conductive polymer,
The first pressure-sensitive adhesive layer is formed of a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an antistatic agent (B),
The said conduction|electrical_connection structure, when the dimensional shrinkage test of the polarizing film which has the said adhesive layer is performed in the environment of 105 degreeC and 500 hours, the amount of dimensional change in the film plane direction of the polarizing film which has the said adhesive layer is 400 micrometers or less A liquid crystal panel which is provided at least at the point b on the side to be formed. According to claim 1,
A liquid crystal panel, characterized in that the amount of dimensional change at the point b at which the conductive structure is provided is 250 μm or less. 3. The method of claim 1 or 2,
The anchor layer has a thickness of 0.01 to 0.5 μm, and a surface resistance value of 1×10 ⁶ to 1×10 ⁹ Ω/□. 4. The method according to any one of claims 1 to 3,
The first pressure-sensitive adhesive layer has a thickness of 1 to 100 μm, and a surface resistance value of 1×10 ⁸ to 1×10 ¹² Ω/□. 5. The method according to any one of claims 1 to 4,
The said 1st polarizing film is the said polarizer and both protective polarizing films which have protective films on both surfaces of the said polarizer, The liquid crystal panel characterized by the above-mentioned. 6. The method according to any one of claims 1 to 5,
The said polarizer contained in the said 1st polarizing film is more than 10 micrometers in thickness, The liquid crystal panel characterized by the above-mentioned. 7. The method according to any one of claims 1 to 6,
The liquid crystal cell is an in-cell liquid crystal cell having a touch sensor and a touch sensing electrode according to a touch driving function between the first transparent substrate and the second transparent substrate. 8. The method according to any one of claims 1 to 7,
A liquid crystal panel having a second polarizing film disposed through a second pressure-sensitive adhesive layer on the side of the second transparent substrate of the liquid crystal cell. The liquid crystal display device which has the liquid crystal panel of Claim 8.

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