JP6748279B2 - Liquid crystal panel with touch sensing function, liquid crystal display device, and polarizing film with adhesive layer - Google Patents

Description

The present invention relates to a liquid crystal panel with a touch sensing function and a liquid crystal display device. The liquid crystal display device with a touch sensing function of the present invention can be used as various input display devices such as mobile devices. The present invention also relates to a polarizing film with an adhesive layer. The pressure-sensitive adhesive layer-attached polarizing film of the present invention can be applied to, for example, a liquid crystal panel with a touch sensing function and a liquid crystal display device.

In a liquid crystal display device, generally, a polarizing film is attached to both sides of a liquid crystal cell through an adhesive layer due to its image forming method. Also, a liquid crystal display device having a touch panel mounted on its display screen has been put into practical use. As the touch panel, there are various types such as an electrostatic capacitance type, a resistance film type, an optical type, an ultrasonic type, and an electromagnetic induction type, but the electrostatic capacitance type has been widely adopted. In recent years, a liquid crystal display device with a touch sensing function, which has a built-in electrostatic capacity sensor as a touch sensor unit, has been used.

On the other hand, in manufacturing a liquid crystal display device, when the pressure-sensitive adhesive layer-attached polarizing film is attached to a liquid crystal cell, the release film is peeled off from the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer-attached polarizing film. Static electricity is generated by peeling. The static electricity thus generated influences the orientation of the liquid crystal layer inside the liquid crystal display device and causes a defect. The generation of static electricity can be suppressed by, for example, forming an antistatic layer on the outer surface of the polarizing film.

On the other hand, the capacitance sensor in the liquid crystal display device with a touch sensing function detects a 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 drive electrode and the sensor electrode is disturbed, and the sensor electrode capacitance becomes unstable, resulting in touch panel sensitivity. Will decrease and cause malfunction. In the liquid crystal display device with a touch sensing function, it is required to suppress the generation of static electricity and the malfunction of the capacitance sensor. For example, in order to reduce the occurrence of display defects and malfunctions in the liquid crystal display device with a touch sensing function, the surface resistance value is 1.0×10 ^{9 to} 1.0×10 ¹¹ Ω/□ in order to solve the above-mentioned problems. It has been proposed to dispose a polarizing film having an antistatic layer on the viewing side of the liquid crystal layer (Patent Document 1).

In addition, a pressure-sensitive adhesive for an optical film having an antistatic function has been proposed for the purpose of preventing unevenness of a liquid crystal panel due to static electricity and preventing foreign matter from adhering (Patent Document 2).

JP, 2013-105154, A JP, 2017-067942, A

According to the polarizing film having the antistatic layer described in Patent Document 1, generation of static electricity can be suppressed to some extent. However, in Patent Document 1, the arrangement location of the antistatic layer is farther from the fundamental location where static electricity is generated, and therefore it is not effective as compared with the case where the antistatic function is given to the pressure-sensitive adhesive layer.

The pressure-sensitive adhesive layer containing an ionic compound is more effective in suppressing static electricity generation and preventing static electricity unevenness than the antistatic layer provided on the polarizing film. However, it was found that the antistatic function of the adhesive layer containing the ionic compound deteriorates with time. In particular, in a humid environment (after a humidity reliability test), the ionic compound in the pressure-sensitive adhesive layer may segregate at the interface with the optical film (polarizing film) or may migrate into the optical film (polarizing film). It was found that the surface resistance value of the pressure-sensitive adhesive layer became large and the antistatic function was remarkably lowered. It has been found that such a decrease in the antistatic function of the adhesive layer causes static electricity unevenness and malfunction of the liquid crystal display device with a touch sensing function.

Further, as the pressure-sensitive adhesive layer-attached polarizing film, when a transparent protective film is provided only on one side of the polarizer and a pressure-sensitive adhesive layer is provided on the other side without a transparent protective film, the adhesive layer is provided. There is. Since the one-sided protective polarizing film with the pressure-sensitive adhesive layer has the transparent protective film only on one side, the polarizing film can be made thinner than the case where the transparent protective film is provided on both sides, and the cost for one transparent protective film is reduced. It is possible. On the other hand, in the pressure-sensitive adhesive protective film with a pressure-sensitive adhesive layer, when the pressure-sensitive adhesive layer contains an ionic compound to impart an antistatic function, the influence of the ionic compound in the pressure-sensitive adhesive layer on the polarizer However, there is a problem that the polarizer is deteriorated with time and the optical characteristics are largely deteriorated after the humidification test.

According to Patent Document 2, it is possible to satisfy a stable antistatic function in a humid environment. However, in Patent Document 2 as well, when the pressure-sensitive adhesive layer-attached one-sided protective polarizing film is used, Further improvement of the antistatic function of the pressure-sensitive adhesive layer is required.

The present invention provides a touch-sensing function in which a transparent protective film having a transparent protective film only on one surface of a polarizer is attached to the viewer side of a liquid crystal cell with a built-in touch-sensing function by an adhesive layer containing an ionic compound. It is an object of the present invention to provide a liquid crystal panel with a touch sensing function that can satisfy a stable antistatic function even in a humidified environment even in a liquid crystal panel with a touch panel. Another object of the present invention is to provide a liquid crystal display device using the liquid crystal panel. Further, the present invention aims to provide a polarizing film with an adhesive layer, which can be applied to the liquid crystal panel with a touch sensing function.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the above-mentioned problems can be solved by the following liquid crystal panel with a touch sensing function, and have completed the present invention.

That is, the present invention is
A liquid crystal cell with a touch sensing function, which has a liquid crystal layer and a touch sensor section,
A first polarizing film arranged on the viewer side of the liquid crystal cell and a second polarizing film arranged on the opposite side of the viewer side; and
In a liquid crystal panel with a built-in touch sensing function, the liquid crystal panel having a first adhesive layer disposed between the first polarizing film and the liquid crystal cell,
The first polarizing film has a polarizer, a transparent protective film only on one side of the polarizer, and a transparent layer on the other side of the polarizer, and the first polarizing film has the transparent layer interposed therebetween. It is provided on the first adhesive layer,
The first pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B), and
The first pressure-sensitive adhesive layer has a surface resistance variation ratio (b/a)≦10,
(However, the a is the first polarized light with an adhesive layer in a state in which the first adhesive layer is provided on the transparent layer of the first polarizing film, and the separator is provided on the first adhesive layer. The surface resistance value of the first pressure-sensitive adhesive layer when the separator was peeled off immediately after producing the film, and the b was the first polarizing film with the pressure-sensitive adhesive layer for 250 hours in a humidified environment of 60° C./95% RH. Liquid crystal panel with a built-in touch sensing function, each of which satisfies a surface resistance value of the first adhesive layer when the separator is peeled off after being charged and further dried at 40° C. for 1 hour, Regarding

In the liquid crystal panel with a built-in touch sensing function, it is preferable that the transparent layer is directly formed on the polarizer.

In the liquid crystal panel with a built-in touch sensing function, the transparent layer preferably has a thickness of 10 μm or less.

In the liquid crystal panel with a built-in touch sensing function, a cured product of a forming material containing a urethane prepolymer, which is a reaction product of an isocyanate compound and a polyhydric alcohol, can be used as the transparent layer. As the isocyanate compound, it is preferable to use at least one selected from tolylene diisocyanate and diphenylmethane diisocyanate.

In the liquid crystal panel with a built-in touch sensing function, the transparent layer may contain an epoxy resin.

In the liquid crystal panel with a built-in touch sensing function, as the transparent layer,
(A) Acrylic monomer in excess of 50 parts by weight and general formula (1) below in excess of 0 and less than 50 parts by weight:
(In the formula, X is a group consisting of vinyl group, (meth)acrylic group, styryl group, (meth)acrylamide group, vinyl ether group, epoxy group, oxetane group, hydroxyl group, amino group, aldehyde group, and carboxyl group. It represents a functional group containing at least one reactive group selected, and R ¹ and R ² are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a substituent. Represents an optionally substituted aryl group or a heterocyclic group optionally having a substituent, and R ¹ and R ² may be linked to each other to form a ring) A polymer obtained by polymerizing and
(B) an epoxy resin, which is a resin composition comprising:
A polymer in which the content ratio of the polymer (a) and the epoxy resin (b) is 95:5 to 60:40 or 40:60 to 1:99 by weight can be used.

The functional group represented by X in the general formula (1) is
General formula (2): Z-Y- (In the formula, Z is a vinyl group, a (meth)acrylic group, a styryl group, a (meth)acrylamide group, a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde. Group and a functional group containing at least one reactive group selected from the group consisting of a carboxyl group, and Y represents an organic group).

In the liquid crystal panel with a built-in touch sensing function, the (meth)acrylic polymer (A) preferably contains an alkyl (meth)acrylate (a1) and an amide group-containing monomer (a2) as monomer units.

In the liquid crystal panel with a built-in touch sensing function, it is preferable that the amide group-containing monomer (a2) is an N-vinyl group-containing lactam monomer.

In the liquid crystal panel with a built-in touch sensing function, the amide group-containing monomer (a2) is preferably contained as a monomer unit in the (meth)acrylic polymer (A) in an amount of 0.1% by weight or more.

In the liquid crystal panel with a built-in touch sensing function, the ionic compound (B) is an alkali metal salt, and the surface resistance value of the first pressure-sensitive adhesive layer according to the a is 1×10 ¹⁰ to 1×10 ¹² Ω/ □ is preferable. Further, the ionic compound (B) is an organic cation-anion salt, and the surface resistance value of the first pressure-sensitive adhesive layer according to the above a is 1×10 ⁸ to 1×10 ¹⁰ Ω/□. preferable.

In the liquid crystal panel with a built-in touch sensing function, it is preferable that the ionic compound (B) is contained in an amount of 0.01 part by weight or more based on 100 parts by weight of the (meth)acrylic polymer (A).

The liquid crystal panel with a built-in touch sensing function may include a conductive layer between the transparent layer and the first adhesive layer.

The liquid crystal panel with a built-in touch sensing function is suitably applied when the touch sensor unit and the first adhesive layer are in direct contact with each other.

The present invention also relates to a liquid crystal display device having the liquid crystal panel with a built-in touch sensing function.

Further, the present invention has a polarizer, a transparent protective film only on one surface of the polarizer, and a transparent layer on the other surface of the polarizer, and an adhesive layer is provided via the transparent layer. A polarizing film with an adhesive layer,
The pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B), and
The first pressure-sensitive adhesive layer has a surface resistance variation ratio (b/a)≦10,
(However, the a is the surface of the pressure-sensitive adhesive layer when the separator is peeled immediately after producing the pressure-sensitive adhesive layer-attached polarizing film in a state where a separator is provided in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer-attached polarizing film. The resistance value is the b, after the pressure-sensitive adhesive layer-attached polarizing film in the state where the separator is provided is put in a humidified environment of 60° C./95% RH for 250 hours, and further dried at 40° C. for 1 hour. And a surface resistance value of the pressure-sensitive adhesive layer when the separator is peeled off).

Also in the polarizing film with the pressure-sensitive adhesive layer, the same preferable embodiment as that of the polarizing film with the pressure-sensitive adhesive layer used in the liquid crystal panel with a built-in touch sensing function can be applied.

The panel with a built-in touch sensing function of the present invention has a liquid crystal cell containing a touch sensor part, and a first adhesive layer provided between the liquid crystal cell and a first polarizing film arranged on the viewing side of the liquid crystal cell. .. The first pressure-sensitive adhesive layer is formed of a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B) as a monomer unit. An ionic compound (B) is contained in the first pressure-sensitive adhesive layer, which can reduce the surface resistance value of the first pressure-sensitive adhesive layer and suppress the generation of static electricity, and the alignment of the liquid crystal layer due to charging. It is possible to suppress the occurrence of light leakage (uneven charging) due to disturbance of the light.

On the other hand, the first polarizing film is a one-sided protective polarizing film having a transparent protective film on only one side of the polarizer, and is advantageous in terms of thinning and cost reduction. On the other hand, when the first pressure-sensitive adhesive layer is applied to the one-sided protective polarizing film, the compatibility balance in the layer is destroyed due to the mixing of water in the first pressure-sensitive adhesive layer in a humid environment, and the ionic compound is Penetration inside the polarizer changes the surface resistance value of the first pressure-sensitive adhesive layer. Further, when the ionic compound comes into contact with the polarizer, the optical properties such as the degree of polarization may be deteriorated. However, in the present invention, since the transparent layer is provided between the polarizer of the first polarizing film and the first pressure-sensitive adhesive layer, the ionic compound in the first pressure-sensitive adhesive layer is changed to the polarizer by the transparent layer. Intrusion into the inside can be suppressed. Therefore, even in a humid environment, the ionic compound (B) in the first pressure-sensitive adhesive layer can be prevented from segregating or migrating to the interface of the polarizing film or the like, and can suppress deterioration of the polarizer over time. It is considered that the pressure-sensitive adhesive layer was able to maintain the surface resistance value within a desired value range for a long period of time, and could satisfy a stable antistatic function and optical characteristics. Furthermore, the antistatic performance can be improved by providing the conductive layer between the transparent layer and the first pressure-sensitive adhesive layer. Since the conductive layer is provided via the transparent layer, the problem of decolorization of the end portion of the polarizer in a humid environment caused by directly providing the conductive layer on the polarizer does not occur.

According to such a liquid crystal panel with a touch sensing function of the present invention, it is possible to suppress charging unevenness due to static electricity generation, it is possible to suppress malfunction, and it is possible to suppress a decrease in touch panel sensitivity. It is thought that it was possible. The liquid crystal panel with a touch sensing function of the present invention is particularly suitable when an in-cell type liquid crystal cell or an on-cell type liquid crystal cell is used as the liquid crystal cell with a touch sensing function.

It is sectional drawing which shows an example of the liquid crystal panel with a touch sensing function of this invention. It is sectional drawing which shows an example of the liquid crystal panel with a touch sensing function of this invention. It is sectional drawing which shows an example of the liquid crystal panel with a touch sensing function of this invention. It is sectional drawing which shows an example of the polarizing film with an adhesive layer of this invention. It is sectional drawing which shows an example of the polarizing film with an adhesive layer of this invention.

A liquid crystal panel with a touch sensing function of the present invention will be described with reference to the drawings. The liquid crystal panel with a built-in touch sensing function of the present invention is arranged on the opposite side of the liquid crystal cell C having the liquid crystal layer 3 and the touch sensor section 5, the first polarizing film 11 arranged on the viewer side of the liquid crystal cell C, and the viewer side. The second polarizing film 12 has a first pressure-sensitive adhesive layer 21 disposed between the first polarizing film 11 and the liquid crystal cell C. The respective configurations of the liquid crystal panel with a built-in touch sensing function of the present invention can be simply shown from the viewer side as follows: first polarizing film 11/first adhesive layer 21/liquid crystal cell C/second polarizing film 12. it can. In the liquid crystal panel with a built-in touch sensing function, the order of the respective components is simply shown, but other components can be appropriately provided between the respective components.

The first polarizing film 11 can be provided as a polarizing film with an adhesive layer. FIG. 4 is an example of a pressure-sensitive adhesive layer-attached polarizing film, and as shown in FIG. 4, a polarizer a, a one-sided protective polarizing film having a transparent protective film b on only one side of the aforesaid polarizer a. The other side of a has a transparent layer c. The first polarizing film 11 is provided on the first adhesive layer 21 via the transparent layer c. It is preferable that the transparent layer c is directly provided on the polarizer a in terms of suppressing an increase in water content of the polarizer under a high temperature and high humidity environment. The transparent layer c will be described later. Further, the polarizing film with the pressure-sensitive adhesive layer may have a conductive layer d between the transparent layer c and the first pressure-sensitive adhesive layer 21, as shown in FIG. 5. The conductive layer d will be described later.

Specific examples of the liquid crystal panel with a touch sensing function of the present invention are shown in, for example, FIGS.

FIG. 1 shows a so-called in-cell type liquid crystal panel with a built-in touch sensing function, and from the viewing side, the first polarizing film 11, the first adhesive layer 21, the first transparent substrate 41, the touch sensor section 5, the liquid crystal layer 3 and The drive electrode/sensor unit 6/second transparent substrate 42/second adhesive layer 22/second polarizing film 12 is configured. In the in-cell liquid crystal panel with a built-in touch sensing function of FIG. 1, for example, the liquid crystal cell C includes the touch sensor unit 5 and the drive electrode/sensor in the first and second glass substrates 41 and 42 (in the liquid crystal cell) that sandwich the liquid crystal layer 3. It has a part 6.

Further, FIG. 2 is a modification of a so-called in-cell type (semi-in-cell type) liquid crystal panel with a touch sensing function, in which, from the viewer side, the first polarizing film 11, the first adhesive layer 21, the touch sensor section 5, and the 1 transparent substrate 41/liquid crystal layer 3/driving electrode/sensor section 6/second transparent substrate 42/second adhesive layer 22/second polarizing film 12. In the in-cell type liquid crystal panel with a touch sensing function of FIG. 2, for example, the liquid crystal cell C is outside the first transparent substrate 41, the touch sensor unit 5 is in direct contact with the first adhesive layer 21, and the liquid crystal layer 3 is sandwiched. The first and second glass substrates 41, 42 (in the liquid crystal cell) have the drive electrode/sensor unit 6 on the side of the second transparent substrate 42.

Further, FIG. 3 shows a so-called on-cell type liquid crystal panel with a built-in touch sensing function, and from the viewing side, the first polarizing film 11, the first adhesive layer 21, the touch sensor unit 5, the drive electrode/sensor unit 6 and the 1 transparent substrate 41/liquid crystal layer 3/driving electrode 7/second transparent substrate 42/second adhesive layer 22/second polarizing film 12. In the on-cell liquid crystal panel with a built-in touch sensing function of FIG. 3, for example, the liquid crystal cell C has the touch sensor unit 5 and the drive electrode/sensor unit 6 outside the first transparent substrate 41, and the touch sensor unit 5 is the first The drive electrode 7 is provided on the side of the second transparent substrate 42 in the first and second glass substrates 41 and 42 (inside the liquid crystal cell) that is in direct contact with the adhesive layer 21 and sandwiches the liquid crystal layer 3.

In the liquid crystal panel with a built-in touch sensing function, when the touch sensor unit 5 of the liquid crystal cell C and the first adhesive layer 21 are in direct contact, the first adhesive layer 21 (containing an ionic compound) is prevented from being charged. The function tends to deteriorate, especially in a humid environment. Therefore, the liquid crystal panel with a built-in touch sensing function of the present invention is suitably applied to the liquid crystal panel with a built-in touch sensing function of the in-cell type (modification) shown in FIG. 2 or the on-cell type shown in FIG.

The first polarizing film 11 has the above-mentioned configuration, but the second polarizing film 12 generally has a transparent protective film on one side or both sides of the polarizer. The first polarizing film 11 and the second polarizing film 12 are arranged on both sides of the liquid crystal layer 3 so that their transmission axes (or absorption axes) are orthogonal to each other.

The polarizer is not particularly limited, and various kinds can be used. Examples of the polarizer include hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene/vinyl acetate copolymer partially saponified films, and dichroic dyes such as iodine and dichroic dyes. Examples thereof include polyene oriented films such as those obtained by adsorbing a substance and uniaxially stretched, polyvinyl alcohol dehydrated products, polyvinyl chloride dehydrochlorinated products, and the like. Among these, a polarizer made of a polyvinyl alcohol film and a dichroic substance such as iodine is preferable. The thickness of these polarizers is not particularly limited, but is generally about 80 μm or less.

A thin polarizer having a thickness of 10 μm or less can be used as the polarizer. From the viewpoint of thinning, the thickness is preferably 1 to 7 μm. It is preferable that such a thin polarizer has less thickness unevenness, excellent visibility, and excellent durability because it has less dimensional change, and that the polarizing film can be made thinner.

As a material forming the transparent protective film, for example, a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier property, isotropic property, etc. is used. Specific examples of such a thermoplastic resin include cellulose resins such as triacetyl cellulose, polyester resins, polyether sulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, and cyclic resins. Examples include polyolefin resins (norbornene-based resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. A transparent protective film is attached to one side of the polarizer by an adhesive layer, while a transparent protective film is attached to the other side as a (meth)acrylic, urethane, acrylurethane, epoxy, silicone. A thermosetting resin such as a system or an ultraviolet curable resin can be used.

As a material of the transparent protective film, a cellulose resin or a (meth)acrylic resin is preferable because the variation ratio (b/a) of the surface resistance value of the first pressure-sensitive adhesive layer can be controlled to be small. As the (meth)acrylic resin, it is preferable to use a (meth)acrylic resin having a lactone ring structure. Examples of the (meth)acrylic resin having a lactone ring structure include JP-A 2000-230016, JP-A 2001-151814, JP-A 2002-120326, JP-A 2002-254544, and JP-A 2005-2005. Examples thereof include (meth)acrylic resins having a lactone ring structure, such as those described in Japanese Patent No. 146084. In particular, the cellulose resin is preferable to the (meth)acrylic resin because it is more effective in suppressing the polarizer crack, which is a problem in the one-sided protective polarizing film.

A functional layer such as a hard coat layer, an antireflection layer, an antisticking layer, a diffusion layer or an antiglare layer may be provided on the surface of the transparent protective film to which the polarizer is not adhered.

The adhesive used for laminating the polarizer and the transparent protective film is not particularly limited as long as it is optically transparent, and various types of water-based, solvent-based, hot-melt type, radical-curing type, and cation-curing type are used. However, a water-based adhesive or a radical curable adhesive is preferable.

The first polarizing film 11 arranged on the viewer side of the liquid crystal cell C and the second polarizing film 12 arranged on the opposite side of the viewer side are different optical films depending on the suitability of their respective locations. It can be used by stacking. As the other optical film, for example, a liquid crystal display device such as a reflection plate, an anti-transmission plate, a retardation film (including a wavelength plate such as 1/2 or 1/4), a visual compensation film, and a brightness enhancement film is formed. Examples of the optical layer that can be used for These can be used in one layer or two or more layers. Even when these other optical films are used, it is preferable that the pressure-sensitive adhesive layer closest to the liquid crystal layer 3 is the first pressure-sensitive adhesive layer 21.

The first pressure-sensitive adhesive layer 21 is formed of a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B). The pressure-sensitive adhesive composition will be described in detail later.

The second adhesive layer 22 is formed of an adhesive. As the pressure-sensitive adhesive, various pressure-sensitive adhesives can be used, for example, rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, polyvinylpyrrolidone-based pressure-sensitive adhesives, Examples thereof include polyacrylamide adhesives and cellulose adhesives. An adhesive base polymer is selected according to the type of the adhesive. Among the pressure-sensitive adhesives, an acrylic pressure-sensitive adhesive is preferably used because it has excellent optical transparency, exhibits appropriate wettability, cohesiveness, and adhesiveness adhesive properties, and is excellent in weather resistance and heat resistance. It The thickness of the second adhesive layer 22 is not particularly limited and is, for example, about 1 to 100 μm. The thickness is preferably 2 to 50 μm, more preferably 2 to 40 μm, and further preferably 5 to 35 μm.

The liquid crystal layer 3 included in the liquid crystal cell C is a liquid crystal layer that is applied to a liquid crystal panel with a built-in touch sensing function and that includes liquid crystal molecules that are homogeneously aligned in the absence of an electric field. As the liquid crystal layer 3, for example, an IPS type liquid crystal layer is preferably used. In addition, as the liquid crystal layer 3, for example, a TN type, STN type, π type, VA type liquid crystal layer of any type can be used. The thickness of the liquid crystal layer is, for example, about 1.5 μm to 4 μm.

In the liquid crystal cell C, the first transparent substrate 41 and the second transparent substrate 42 can form a liquid crystal cell with the liquid crystal layer 3 interposed therebetween. A touch sensor unit 5, a drive electrode/sensor unit 6, a drive electrode 7 and the like are formed inside or outside the liquid crystal cell depending on the form of the liquid crystal panel with a built-in touch sensing function. A color filter substrate can be provided on the liquid crystal cell (first transparent substrate 41).

Examples of the material forming the transparent substrate include glass and polymer films. Examples of the polymer film include polyethylene terephthalate, polycycloolefin, polycarbonate and the like. When the transparent substrate is made of glass, its thickness is, for example, about 0.3 mm to 1 mm. When the transparent substrate is formed of a polymer film, its thickness is, for example, about 10 μm to 200 μm. The transparent substrate may have an easy adhesion layer or a hard coat layer on its surface.

The touch sensor unit 5 (electrostatic capacitance sensor), the drive electrode/sensor unit 6, and the drive electrode 7 are formed as a transparent conductive layer. The constituent material of the transparent conductive layer is not particularly limited, and examples thereof include metals such as gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, and tungsten, and these metals. Examples include alloys. In addition, 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 these. A metal oxide composed of a mixture of In addition, other metal compounds such as copper iodide are used. The metal oxide may further contain an oxide of a metal atom shown in the above group, if necessary. For example, indium oxide (ITO) containing tin oxide and tin oxide containing antimony are preferably used, and ITO is particularly preferably used. The ITO preferably contains 80 to 99% by weight of indium oxide and 1 to 20% by weight of tin oxide.

There is no limitation on the location where the touch sensor layer 5 is formed in the liquid crystal cell C, and the touch sensor layer 5 is formed according to the form of the liquid crystal panel with a touch sensing function. For example, FIGS. 1 to 3 illustrate the case where the touch sensor layer 5 is arranged between the first polarizing film 11 and the liquid crystal layer 3. The touch sensor layer 5 can be formed as a transparent electrode pattern on the first transparent substrate 41, for example. Also for the drive electrode/sensor unit 6 and the drive electrode 7, a transparent electrode pattern can be formed according to a conventional method according to the form of the liquid crystal panel with a touch sensing function. The transparent electrode pattern is usually electrically connected to a wiring line (not shown) formed at the end of the transparent substrate, and the wiring line is connected to a controller IC (not shown). The shape of the transparent electrode pattern may be a comb shape, a stripe shape, a rhombus shape, or any other shape depending on the application. The height of the transparent electrode pattern is, for example, 10 nm to 100 nm, and the width is 0.1 mm to 5 mm.

For the liquid crystal panel with a built-in touch sensing function, a member forming a liquid crystal display device such as one using a backlight or a reflector for an illumination system can be appropriately used.

The transparent layer will be described in detail below.

The thickness of the transparent layer is preferably 10 μm or less, more preferably 5 μm or less, and further preferably 3 μm or less from the viewpoints of thinning and optical reliability. It is preferably 5 μm or less, and more preferably 1 μm or less. When the transparent layer is too thick, the thickness of the polarizing film becomes large, and further the optical reliability of the polarizer may be reduced. On the other hand, the thickness of the transparent layer is preferably 0.1 μm or more, more preferably 0.2 μm or more, further preferably 0.3 μm or more, from the viewpoint of suppressing the fluctuation ratio of the surface resistance value of the pressure-sensitive adhesive layer. Is preferred.

As a material for forming the transparent layer, a material having transparency and having a fluctuation ratio of the surface resistance value of the pressure-sensitive adhesive layer to a predetermined value can be used. As such a material, it is effective that the free volume pore diameter of the transparent layer is smaller than the molecular size of the hydrate of the ionic compound (B) contained in the pressure-sensitive adhesive layer. A forming material containing the urethane prepolymer (a), which is a reaction product with alcohol, can be mentioned.

As the isocyanate compound, for example, a polyfunctional isocyanate compound is preferable, and specific examples thereof include a polyfunctional aromatic isocyanate compound, an alicyclic isocyanate compound, an aliphatic isocyanate compound, or a dimer thereof.

As the polyfunctional aromatic isocyanate compound, for example, phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,2'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 4 , 4'-toluidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, xylylene diisocyanate, methylenebis 4-phenyl isocyanate, p-phenylene diisocyanate, and the like.

Examples of the polyfunctional alicyclic isocyanate compound include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-bisisocyanatomethylcyclohexane, isophorone diisocyanate, and hydrogen. Examples thereof include added diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated tetramethyl xylylene diisocyanate and the like.

Examples of the polyfunctional aliphatic isocyanate compound include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, 2,4. 4-trimethylhexamethylene diisocyanate and the like can be mentioned.

Examples of the polyfunctional isocyanate compound include compounds having three or more isocyanate groups such as isocyanuric acid tris(6-incyanate hexyl).

Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-. 1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2- Methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, polypropylene glycol and the like can be mentioned.

In the present invention, as the urethane prepolymer (a), a rigid structure in which a cyclic structure (benzene ring, cyanurate ring, isocyanurate ring, etc.) occupies a large proportion in the structure is used. preferable. For example, the polyfunctional isocyanate compounds may be used alone or in combination of two or more, but aromatic isocyanate compounds are preferable from the viewpoint of suppressing the mixing of water into the polarizer. Other polyfunctional isocyanate compounds can be used in combination with the aromatic isocyanate compound. In particular, it is preferable to use at least one selected from tolylene diisocyanate and diphenylmethane diisocyanate as the isocyanate compound among the aromatic isocyanate compounds.

As the urethane prepolymer (a), trimethylolpropane-tri-tolylene isocyanate and trimethylolpropane-tri-diphenylmethane diisocyanate are preferably used. The urethane prepolymer (a) is a compound having a terminal isocyanate group, and can be obtained, for example, by mixing an isocyanate compound and a polyhydric alcohol and stirring and reacting them. Usually, it is preferable to mix the isocyanate compound and the polyhydric alcohol so that the isocyanate group becomes excessive with respect to the hydroxyl group of the polyhydric alcohol.

The urethane prepolymer (a) may have a terminal isocyanate group with a protective group. Protecting groups include oximes and lactams. When the isocyanate group is protected, the protective group is dissociated from the isocyanate group by heating and the isocyanate group reacts.

The forming material for forming the transparent layer may contain, in addition to the urethane prepolymer (a), a compound (b) having at least two functional groups having active hydrogen having reactivity with an isocyanate group. Examples of the functional group having active hydrogen having reactivity with an isocyanate group include a hydroxyl group and an amino group. As the number of functional groups having active hydrogen contained in the compound (b) increases, the number of reaction points with the isocyanate groups of the urethane prepolymer (a) increases and a cured product is easily formed. Therefore, the number of the functional groups is 3 The above is preferable.

Further, the compound (b) preferably has a molecular weight divided by the number of the functional groups of 350 or less. Thus, by defining the relationship between the molecular weight and the number of functional groups, the reactivity between the compound (b) and the isocyanate group of the urethane prepolymer (a) can be ensured.

The molecular weight of the compound (b) is preferably 1000 or less. The compound (b) having a molecular weight in the range of 1,000 or less is preferable in terms of compatibility when the forming material is prepared as a solution together with the urethane prepolymer (a).

Examples of the compound (b) include polyhydric alcohols, polyvalent amines, compounds having a hydroxyl group and an amino group in the molecule, and the like.

Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-. 1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2- Bifunctional alcohols such as methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, polypropylene glycol; trifunctional alcohols such as glycerin and trimethylolpropane; tetrafunctional alcohols such as pentaerythritol, hexanetriol and sorbitol. Alcohols and the like; in addition, alkylene oxide (for example, propylene oxide) adducts of the polyhydric alcohols such as polyoxypropylene glyceryl ether, polyoxypropylene trimethylolpropane ether, and polyoxypropylene sorbitol ether.

Examples of the polyvalent amine include ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, isophoronediamine, dicyclohexylmethane-4,4'-diamine, and dimerdiamine.

Examples of the compound having a hydroxyl group and an amino group in the molecule include 2-hydroxyethylethylenediamine, 2-hydroxyethylpropylenediamine, di-2-hydroxyethylethylenediamine, di-2-hydroxyethylpropylenediamine, 2-hydroxy. Diamines having a hydroxyl group in the molecule such as propylethylenediamine and di-2-hydroxypropylethylenediamine;
Alkanolamines such as ethanolamine, diethanolamine and triethanolamine can be mentioned.

It is preferable to use a polyhydric alcohol as the compound (b) from the viewpoint of preventing deterioration in optical reliability of the polarizer, and particularly, trimethylolpropane is preferable from the viewpoint of reactivity with the urethane prepolymer (a). preferable.

The forming material contains the urethane prepolymer (a) as a main component. The urethane prepolymer (a) preferably contains 50% by weight or more of the solid content of the forming material.

The compounding ratio of the compound (b) to the urethane prepolymer (a) is 5% by weight or more based on the total 100% by weight (solid content ratio) of the urethane prepolymer (a) and the compound (b). Preferably. The compounding ratio of the compound (b) is preferably 10% by weight or more from the viewpoint of improving the film strength. On the other hand, when the compounding ratio of the compound (b) is increased, the optical reliability of the polarizer may be deteriorated. Therefore, the compounding ratio of the compound (b) is 80% by weight or less, and further 50% by weight or less. It is preferable.

A reaction catalyst can be used in the forming material in order to further increase the reactivity of the isocyanate group. The reaction catalyst is not particularly limited, but a tin-based catalyst or an amine-based catalyst is preferable. As the reaction catalyst, one kind or two or more kinds can be used. The amount of the reaction catalyst used is usually 5 parts by weight or less with respect to 100 parts by weight of the urethane prepolymer (a). When the amount of the reaction catalyst is large, the crosslinking reaction rate is increased and the forming material is foamed. Even if a forming material after foaming is used, sufficient adhesiveness cannot be obtained. Usually, when a reaction catalyst is used, it is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 4 parts by weight.

Further, a reaction catalyst can be used to increase the reactivity of the isocyanate group. The reaction catalyst is not particularly limited, but a tin-based catalyst or an amine-based catalyst is preferable. As the reaction catalyst, one kind or two or more kinds can be used. The amount of the reaction catalyst used is usually 5 parts by weight or less based on 100 parts by weight of the urethane prepolymer. When the amount of the reaction catalyst is large, the crosslinking reaction rate is increased and the forming material is foamed. Even if a forming material after foaming is used, sufficient adhesiveness cannot be obtained. Usually, when a reaction catalyst is used, it is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 4 parts by weight.

As the tin-based catalyst, either an inorganic type or an organic type can be used, but an organic type is preferable. Examples of the inorganic tin-based catalyst include stannous chloride and stannic chloride. The organic tin-based catalyst preferably has at least one organic group such as an aliphatic group or an alicyclic group having a skeleton such as a methyl group, an ethyl group, an ether group, or an ester group. Examples thereof include tetra-n-butyltin, tri-n-butyltin acetate, n-butyltin trichloride, trimethyltin hydroxide, dimethyltin dichloride and dibutyltin dilaurate.

The amine catalyst is not particularly limited. For example, those having at least one organic group such as alicyclic group such as quinoclidine, amidine and diazabicycloundecene are preferable. Other examples of amine-based catalysts include triethylamine and the like. Examples of reaction catalysts other than those mentioned above include cobalt naphthenate and benzyltrimethylammonium hydroxide.

The forming material is usually used as a solution containing the urethane prepolymer (a) and the compound (b). The solution may be solvent-based or may be water-based such as emulsion, colloidal dispersion, and aqueous solution.

The organic solvent is not particularly limited as long as it does not have a functional group having active hydrogen having reactivity with an isocyanate group and uniformly dissolves the urethane prepolymer (a) and the compound (b) constituting the forming material. Absent. The organic solvent may be used alone or in combination of two or more. As the organic solvent, different solvents can be used for the urethane prepolymer (a) and the compound (b). In this case, the forming material can be prepared by mixing each solution after preparing each solution. Further, the viscosity of the forming material can be adjusted by further adding an organic solvent to the prepared forming material. Further, even in the case of a solvent-based solution dissolved in an organic solvent, alcohols, water, etc. exemplified below can be contained as a solvent.

Organic solvents include aromatic hydrocarbons such as toluene and xylene); esters such as ethyl acetate and butyl acetate; aliphatic or alicyclic hydrocarbons such as hexane, cyclohexane and methylcyclohexane; 1,2-dichloroethane And the like; ethers such as tert-butyl methyl ether; ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cyclopentanone, and acetylacetone; and the like.

In the case of using a water system, for example, alcohols such as n-butyl alcohol and isopropyl alcohol, and ketones such as acetone can be blended. When it is made water-based, a dispersant is used, or urethane prepolymer is used as a functional group having low reactivity with isocyanate groups such as carboxylate, sulfonate, and quaternary ammonium salt, and water dispersibility such as polyethylene glycol. This can be done by introducing the components.

<Epoxy resin>
An epoxy resin can be used as a material for forming the transparent layer.
Any appropriate epoxy resin can be used as the epoxy resin. An epoxy resin having an aromatic ring is preferably used as the epoxy resin. By using the epoxy resin, it is possible to prevent the surface resistance value of the pressure-sensitive adhesive layer from changing over time, have better adhesiveness with the polarizer, and prevent color loss from the end portion of the polarizer. Furthermore, when the pressure-sensitive adhesive layer is formed on the transparent layer, the anchoring force of the pressure-sensitive adhesive layer can be improved. Examples of the epoxy resin having an aromatic ring include bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins and other bisphenol type epoxy resins; phenol novolac epoxy resins, cresol novolac epoxy resins, hydroxybenzaldehyde phenol novolacs. Novolak type epoxy resin such as epoxy resin; tetrahydroxyphenylmethane glycidyl ether, tetrahydroxybenzophenone glycidyl ether, polyfunctional epoxy resin such as epoxidized polyvinylphenol, naphthol type epoxy resin, naphthalene type epoxy resin, biphenyl type Examples thereof include epoxy resin. Preferably, a bisphenol A type epoxy resin, a biphenyl type epoxy resin, and a bisphenol F type epoxy resin are used. By using these epoxy resins, color loss from the end portion of the polarizer can be further prevented. Only one epoxy resin may be used, or two or more epoxy resins may be used in combination.

The weight average molecular weight (Mw) of the epoxy resin is preferably 20,000 or more, more preferably 30,000 or more, still more preferably 37,000 or more. When the weight average molecular weight of the epoxy resin is within the above range, it is possible to further prevent color loss from the end portion of the polarizer. The weight average molecular weight can be measured, for example, by GPC.

The material for forming the transparent layer is, for example, more than 50 parts by weight of an acrylic monomer and more than 0 parts by weight and less than 50 parts by weight of a monomer represented by the following general formula (1). It is possible to use a composition containing a polymer (a) (hereinafter also referred to as a polymer (a)) obtained by polymerizing the above and an epoxy resin (b). The content ratio of the polymer (a) and the epoxy resin (b) is preferably 95:5 to 60:40 or 40:60 to 1:99 by weight.
(In the formula, X is a group consisting of vinyl group, (meth)acrylic group, styryl group, (meth)acrylamide group, vinyl ether group, epoxy group, oxetane group, hydroxyl group, amino group, aldehyde group, and carboxyl group. It represents a functional group containing at least one reactive group selected, and R ¹ and R ² are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a substituent. Represents an optionally substituted aryl group or a heterocyclic group optionally having a substituent, and R ¹ and R ² may be linked to each other to form a ring).

The content ratio of the polymer (a) and the epoxy resin (b) in the composition is 95:5 to 60:40 or 40:60 to 1:99 by weight. When the content ratio of the polymer (a) and the epoxy resin (b) is within the above range, the surface resistance value of the pressure-sensitive adhesive layer is prevented from changing over time, the adhesiveness to the polarizer is excellent, and the edge of the polarizer is excellent. A resin composition for a transparent layer capable of preventing color loss from a part is obtained. Further, when the content ratio of the polymer (a) and the epoxy resin (b) is within the above range, the anchoring force of the pressure-sensitive adhesive layer can be improved when the pressure-sensitive adhesive layer is formed on the transparent layer. As a result, it is possible to obtain a polarizing plate (transparent layer-attached one-sided protective polarizing film) that achieves both the adhesion between the polarizer and the transparent layer and the anchoring force of the pressure-sensitive adhesive layer formed on the transparent layer. The content ratio of the polymer (a) and the epoxy resin (b) is, by weight ratio, preferably 95:5 to 80:20, or 20:80 to 5:95, and more preferably 90:10. 70:30 or 30:70 to 10:90. The closer the content ratio of the polymer (a) and the epoxy resin (b) is to the equal proportion (50:50), the whiter the protective layer may be.

<Polymer (a)>
The polymer (a) is obtained by polymerizing more than 50 parts by weight of an acrylic monomer and more than 0 parts by weight and less than 50 parts by weight of the monomer represented by the general formula (1). can get.

The polymer (a) typically has a structure represented by the following formula. By polymerizing the monomer represented by the general formula (1) and an acrylic monomer component, the polymer (a) has a substituent containing a boron in its side chain (for example, repeating k in the following formula). Units). This can improve the adhesion between the polarizer and the layer (transparent layer) formed using the resin composition. The substituent containing boron may be continuously contained in the polymer or may be randomly contained therein.
The polymer (a) may be used alone or in combination of two or more kinds.
(In the formula, R ⁶ represents an arbitrary functional group, and j and k represent an integer of 1 or more).

The weight average molecular weight of the polymer (a) is preferably 10,000 or more, more preferably 20,000 or more, further preferably 35,000 or more, and particularly preferably 50,000 or more. .. The weight average molecular weight of the polymer (a) is preferably 250,000 or less, more preferably 200,000 or less, still more preferably 150,000 or less. When the weight average molecular weight of the polymer (a) is within the above range, the crack resistance of the layer (transparent layer) formed using the resin composition can be improved. The weight average molecular weight can be measured, for example, by GPC (solvent: dimethylformamide (DMF)).

The glass transition temperature of the polymer (a) is preferably 50° C. or higher, more preferably 60° C. or higher, still more preferably 80° C. or higher. The glass transition temperature of the polymer (a) is preferably 300°C or lower. When the glass transition temperature is within the above range, the crack resistance of the layer (transparent layer) formed using the resin composition can be improved.

The polymer (a) includes an acrylic monomer in an amount of more than 50 parts by weight, an amount of the monomer represented by the formula (1) in an amount of more than 0 parts by weight and less than 50 parts by weight, and a polymerization initiator. It can be obtained by polymerizing a monomer composition containing the other monomer by any suitable polymerization method. Solution polymerization is preferably used as the polymerization method. By polymerizing the polymer (a) by solution polymerization, a higher molecular weight polymer can be obtained.

≪Acrylic monomer≫
Any appropriate acrylic monomer can be used as the acrylic monomer. For example, a (meth)acrylic acid ester-based monomer having a linear or branched structure and a (meth)acrylic acid ester-based monomer having a cyclic structure may be mentioned. In the present specification, (meth)acrylic refers to acrylic and/or methacrylic.

Examples of the (meth)acrylic acid ester-based monomer having a linear or branched structure include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, and (meth)acrylic acid. Examples include isopropyl, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, methyl 2-ethylhexyl (meth)acrylate, and 2-hydroxyethyl (meth)acrylate. .. Preferably, methyl (meth)acrylate is used. The (meth)acrylic acid ester-based monomer may be used alone or in combination of two or more kinds.

Examples of the (meth)acrylic acid ester-based monomer having a cyclic structure include cyclohexyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, 1-adamantyl (meth)acrylate, and ( (Meth)acrylic acid dicyclopentenyl, (meth)acrylic acid dicyclopentenyloxyethyl, (meth)acrylic acid dicyclopentanyl, biphenyl (meth)acrylate, o-biphenyloxyethyl (meth)acrylate, o-biphenyloxyethoxy Ethyl (meth)acrylate, m-biphenyloxyethyl acrylate, p-biphenyloxyethyl (meth)acrylate, o-biphenyloxy-2-hydroxypropyl (meth)acrylate, p-biphenyloxy-2-hydroxypropyl (meth)acrylate , M-biphenyloxy-2-hydroxypropyl (meth)acrylate, N-(meth)acryloyloxyethyl-o-biphenylcarbamate, N-(meth)acryloyloxyethyl-p-biphenylcarbamate, N-(meth) Examples thereof include acryloyloxyethyl-m-biphenyl carbamate, biphenyl group-containing monomers such as o-phenylphenol glycidyl ether acrylate, terphenyl (meth)acrylate, o-terphenyloxyethyl (meth)acrylate and the like. Preferably, 1-adamantyl (meth)acrylate and dicyclopentanyl (meth)acrylate are used. By using these monomers, a polymer having a high glass transition temperature can be obtained. These monomers may be used alone or in combination of two or more. In addition, in this specification, (meth)acryloyl means an acryloyl group and/or a methacryloyl group.

Further, a silsesquioxane compound having a (meth)acryloyl group may be used instead of the (meth)acrylic acid ester-based monomer. By using the silsesquioxane compound, an acrylic polymer having a high glass transition temperature can be obtained. It is known that the silsesquioxane compound has various skeleton structures, for example, skeletons such as a cage structure, a ladder structure, and a random structure. The silsesquioxane compound may have only one type of these structures or may have two or more types of these structures. The silsesquioxane compounds may be used alone or in combination of two or more.

As the silsesquioxane compound having a (meth)acryloyl group, for example, MAC grade and AC grade of SQ series of Toagosei Co., Ltd. can be used. The MAC grade is a silsesquioxane compound containing a methacryloyl group, and specific examples thereof include MAC-SQ TM-100, MAC-SQ SI-20, and MAC-SQ HDM. AC grade is a silsesquioxane compound containing an acryloyl group, and specific examples thereof include AC-SQ TA-100 and AC-SQ SI-20.

The acrylic monomer is used in an amount exceeding 50 parts by weight. The acrylic monomer is used so that the total amount of the acrylic monomer and the monomer represented by the general formula (1) is 100 parts by weight.

<<Monomer represented by the general formula (1)>>
By using the monomer represented by the general formula (1), a substituent containing boron is introduced into the side chain of the polymer (a). Therefore, the adhesion between the polarizer typically composed of the PVA-based resin and the layer (transparent layer) formed using the resin composition can be improved. In addition, the water resistance of the layer (transparent layer) itself formed using the resin composition is also improved, and color loss from the end portion of the polarizer can be prevented. The monomers may be used alone or in combination of two or more.
(In the formula, X is a group consisting of vinyl group, (meth)acrylic group, styryl group, (meth)acrylamide group, vinyl ether group, epoxy group, oxetane group, hydroxyl group, amino group, aldehyde group, and carboxyl group. It represents a functional group containing at least one reactive group selected, and R ¹ and R ² are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a substituent. Represents an optionally substituted aryl group or a heterocyclic group optionally having a substituent, and R ¹ and R ² may be linked to each other to form a ring).

As the aliphatic hydrocarbon group, a linear or branched alkyl group having 1 to 20 carbon atoms which may have a substituent, and a cyclic alkyl group having 3 to 20 carbon atoms which may have a substituent. , And an alkenyl group having 2 to 20 carbon atoms. Examples of the aryl group include a phenyl group having 6 to 20 carbon atoms which may have a substituent and a naphthyl group having 10 to 20 carbon atoms which may have a substituent. Examples of the heterocyclic group include a 5-membered ring group and a 6-membered ring group containing at least one hetero atom which may have a substituent. In addition, R ¹ and R ² may be linked to each other to form a ring. R ¹ and R ² are preferably a hydrogen atom or a linear or branched alkyl group having 1 to 3 carbon atoms, and more preferably a hydrogen atom.

The reactive group contained in the functional group represented by X is a vinyl group, a (meth)acrylic group, a styryl group, a (meth)acrylamide group, a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde group. And at least one selected from the group consisting of carboxyl groups. Preferably, the reactive groups are (meth)acrylic groups and/or (meth)acrylamide groups. By having these reactive groups, the adhesion between the polarizer and the layer (transparent layer) formed using the resin composition can be improved.

In one embodiment, the functional group represented by X is represented by the general formula (2): Z-Y- (wherein Z is a vinyl group, a (meth)acryl group, a styryl group, a (meth)acrylamide group. Represents a functional group containing at least one reactive group selected from the group consisting of a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde group, and a carboxyl group, and Y represents an organic group. It is preferable that it is a functional group represented by these. The organic group specifically means an organic group having 1 to 20 carbon atoms which may have a substituent, and more specifically, for example, having a substituent having 1 to 20 carbon atoms. Optionally linear or branched alkylene group, cyclic alkylene group having 3 to 20 carbon atoms which may have a substituent, phenylene group which may have substituent group having 6 to 20 carbon atoms, and 10 carbon atoms. Examples thereof include a naphthylene group which may have 20 substituents.

As the monomer represented by the general formula (1), the following compounds can be specifically used.

Examples of the monomer represented by the general formula (1) include hydroxyethyl acrylamide and boric acid ester, methylol acrylamide and boric acid ester, hydroxyethyl acrylate and boric acid ester, and Esters of (meth)acrylate and boric acid can be exemplified, such as esters of hydroxybutyl acrylate and boric acid.

The content of the monomer represented by the general formula (1) is more than 0 parts by weight and less than 50 parts by weight. It is preferably 0.01 parts by weight or more and less than 50 parts by weight, more preferably 0.05 parts by weight to 20 parts by weight, and further preferably 0.1 parts by weight to 10 parts by weight. When the content of the monomer exceeds 50 parts by weight, color loss may easily occur from the end portion.

<<Polymerization initiator>>
Any appropriate polymerization initiator can be used as the polymerization initiator. Examples thereof include peroxides such as benzoyl peroxide, lauroyl peroxide and sodium peroxide; hydroperoxides such as t-butyl hydroperoxide and cumene hydroperoxide; azo compounds such as azobisisobutyronitrile; and the like. As the polymerization initiator, only one type may be used, or two or more types may be used.

The content of the polymerization initiator may be any appropriate amount. The content of the polymerization initiator is preferably 0.1 part by weight to 5 parts by weight, and more preferably 0.3 part by weight to 2 parts by weight.

<< Polymerization method >>
As described above, the polymer (a) is preferably obtained by solution polymerization of a monomer component such as an acrylic monomer and a monomer represented by the general formula (1). Any appropriate solvent can be used as the solvent used in the solution polymerization. For example, water; alcohols such as methyl alcohol, ethyl alcohol and isopropyl alcohol; aromatic or aliphatic hydrocarbons such as benzene, toluene, xylene, cyclohexane and n-hexane; ester compounds such as ethyl acetate; ketones such as acetone and methyl ethyl ketone. Compounds: Cyclic ether compounds such as tetrahydrofuran and dioxane, etc. may be mentioned. These solvents may be used alone or in combination of two or more. Moreover, you may use together an organic solvent and water.

The polymerization reaction can be performed at any suitable temperature and time. For example, the polymerization reaction can be carried out in the range of 50°C to 100°C, preferably 60°C to 80°C. The reaction time is, for example, 1 hour to 8 hours, preferably 3 hours to 5 hours.

<Epoxy resin (b)>
Any appropriate epoxy resin can be used as the epoxy resin (b). As the epoxy resin (b), an epoxy resin having an aromatic ring is preferably used. By using an epoxy resin having an aromatic ring as the epoxy resin (b), it is possible to obtain a resin composition for a transparent layer which is more excellent in adhesiveness with a polarizer and can prevent color loss from the end portion of the polarizer. .. Furthermore, when the pressure-sensitive adhesive layer is formed on the transparent layer, the anchoring force of the pressure-sensitive adhesive layer can be improved. Examples of the epoxy resin having an aromatic ring include bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins and other bisphenol type epoxy resins; phenol novolac epoxy resins, cresol novolac epoxy resins, hydroxybenzaldehyde phenol novolacs. Novolak type epoxy resin such as epoxy resin; tetrahydroxyphenylmethane glycidyl ether, tetrahydroxybenzophenone glycidyl ether, polyfunctional epoxy resin such as epoxidized polyvinylphenol, naphthol type epoxy resin, naphthalene type epoxy resin, biphenyl type Examples thereof include epoxy resin. Preferably, a bisphenol A type epoxy resin, a biphenyl type epoxy resin, and a bisphenol F type epoxy resin are used. By using these epoxy resins, color loss from the end portion of the polarizer can be further prevented. Only one epoxy resin may be used, or two or more epoxy resins may be used in combination.

The weight average molecular weight (Mw) of the epoxy resin (b) is preferably 20,000 or more, more preferably 30,000 or more, still more preferably 37,000 or more. When the weight average molecular weight of the epoxy resin (b) is within the above range, it is possible to further prevent color loss from the end portion of the polarizer. The weight average molecular weight can be measured, for example, by GPC.

<Other ingredients>
The resin composition for a transparent layer may contain any appropriate other component in addition to the epoxy resin, the polymer (a) and the epoxy resin (b). Other components include, for example, a solvent and an additive. As the solvent, a solvent that can be used in solution polymerization of the polymer (a) may be used, or another solvent may be used. As the other solvent, ethyl acetate, toluene, methyl ethyl ketone and cyclopentanone are preferably used. These solvents may be used alone or in combination of two or more.

Any appropriate additive can be used as the additive. For example, a surfactant, an ultraviolet absorber, an antioxidant, a tackifier, etc. may be mentioned. As the additive, only one kind may be used, or two or more kinds may be used in combination. These additives can be used in any suitable amount.

<Method for preparing resin composition for transparent layer>
The transparent layer resin composition can be prepared by any appropriate method. For example, it can be prepared by mixing the polymer (a), the epoxy resin (b), and, if necessary, any appropriate additive in any appropriate solvent. When the polymer (a) is polymerized by solution polymerization, it may be prepared by adding the epoxy resin (b) and any appropriate additive to the polymerization solution of the polymer (a) and mixing them. Good.

As a material for forming a transparent layer other than the forming material containing the urethane prepolymer (a), the forming material containing the epoxy resin, and the forming material of the composition containing the polymer (a) and the epoxy resin (b) Examples include cyanoacrylate-based forming materials, epoxy-based forming materials, urethane acrylate-based forming materials, and the like.

The formation of the transparent layer can be appropriately selected depending on the type of the forming material. For example, the transparent layer can be formed by applying the forming material to a polarizer or the like and then curing the applied material. It can be obtained as a layer. Usually, it is carried out by forming a cured layer by drying at about 30 to 100° C., preferably 50 to 80° C. for about 0.5 to 15 minutes after the application. Furthermore, when the forming material contains an isocyanate component, an annealing treatment is performed at about 30 to 100° C., preferably at 50 to 80° C. for about 0.5 to 24 hours to accelerate the reaction. You can

Below, the adhesive composition which forms the 1st adhesive layer 21 is demonstrated.

The pressure-sensitive adhesive composition contains a (meth)acrylic polymer (A) and an ionic compound (B).

The (meth)acrylic polymer (A) contains, as a monomer unit, an alkyl (meth)acrylate (a1) as a main component. In addition, (meth)acrylate refers to acrylate and/or methacrylate, and has the same meaning as (meth) of the present invention.

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

The weight ratio of the alkyl (meth)acrylate (a1) is 70% by weight or more in the weight ratio of all the constituent monomers (100% by weight) constituting the (meth)acrylic polymer (A) as a monomer unit. preferable. The weight ratio of the alkyl (meth)acrylate (a1) can be considered as the balance of the other copolymerization monomers. It is preferable to set the weight ratio of the alkyl (meth)acrylate (a1) within the above range in order to secure the adhesiveness.

In the (meth)acrylic polymer (A), in addition to the monomer unit of the alkyl (meth)acrylate (a1), a (meth)acryloyl group, a vinyl group or the like for the purpose of improving adhesiveness and heat resistance. One or more kinds of copolymerizable monomers having a polymerizable functional group having an unsaturated double bond can be introduced by copolymerization.

Examples of the copolymerization monomer include functional group-containing monomers such as amide group-containing monomers, carboxyl group-containing monomers, and hydroxyl group-containing monomers. Among these, the amide group-containing monomer (a2) is preferable.

In the pressure-sensitive adhesive composition used for forming the first pressure-sensitive adhesive layer, when the amide group introduced into the side chain in the (meth)acrylic polymer (A) as the base polymer is present, Due to the presence of the amide group, the surface resistance value of the first pressure-sensitive adhesive layer, which is adjusted by blending the ionic compound (B), is prevented from fluctuating and increasing even under a humid environment. It is preferable to maintain it within the range. Compatibility of the (meth)acrylic polymer (A) with the ionic compound (B) due to the presence of an amide group introduced as a functional group of the copolymerization monomer in the side chain of the (meth)acrylic polymer (A) Is expected to rise.

Moreover, the said adhesive layer WHEREIN: When the amide group introduce|transduced into the side chain in the (meth)acrylic-type polymer (A) which is a base polymer exists, glass and a transparent conductive layer (ITO layer etc.). It has good durability against any of the above, and it is possible to suppress the occurrence of peeling, floating, etc. in the state of being attached to the liquid crystal panel. Further, the durability can be satisfied even in a humid environment (after a humidification reliability test).

The amide group-containing monomer (a2) is a compound containing an amide group in its structure and a polymerizable unsaturated double bond such as a (meth)acryloyl group and a vinyl group. Specific examples of the amide group-containing monomer (a2) 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, aminoethyl(meth)acrylamide , Mercaptomethyl (meth)acrylamide, mercaptoethyl (meth)acrylamide and other acrylamide monomers; N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine and other N-acryloyl heterocycles Monomers: N-vinyl group-containing lactam monomers such as N-vinylpyrrolidone and N-vinyl-ε-caprolactam. The amide group-containing monomer (a2) is preferable in terms of suppressing an increase in surface resistance value over time (particularly in a humid environment) and satisfying durability. In particular, among the amide group-containing monomers (a2), particularly the N-vinyl group-containing lactam-based monomer suppresses an increase in the surface resistance value over time (particularly in a humidified environment), or has a transparent conductive layer (touch). It is preferable in satisfying the durability against the sensor layer). Although not exemplified in the above, the amide group-containing monomer having a hydroxyl group tends to have improved conductivity in combination with the ionic compound (B), and when the use ratio increases, a polarizing film ( It is preferably not used because there is a problem in anchoring force with the optical film) and reworkability with the transparent conductive layer (touch sensor layer).

The weight ratio of the amide group-containing monomer (a2) is preferably 0.1% by weight or more from the viewpoint of suppressing an increase in the surface resistance value over time (especially in a humid environment). The weight ratio is preferably 0.3% by weight or more, and more preferably 0.5% by weight or more. On the other hand, if the weight ratio is too large, the anchoring property to the base film such as the polarizing film tends to be lowered. Therefore, the weight ratio is preferably 35% by weight or less, and further 20% by weight or less. It is more preferably 10% by weight or less, and even more preferably less than 5% by weight.

The carboxyl group-containing monomer is a compound containing a carboxyl group in its structure and a polymerizable unsaturated double bond such as a (meth)acryloyl group or 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, crotonic acid and the like. Among the carboxyl group-containing monomers, acrylic acid is preferable from the viewpoint of copolymerizability, price, and adhesive property.

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

When the pressure-sensitive adhesive composition contains a crosslinking agent, the carboxyl group-containing monomer and the hydroxyl group-containing monomer become reaction points with the 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 pressure-sensitive adhesive layer. A carboxyl group-containing monomer is preferable from the viewpoint of achieving both durability and reworkability, and a hydroxyl group-containing monomer is preferable from the viewpoint of reworkability.

The above-mentioned weight ratio of the carboxyl group-containing monomer is preferably 2% by weight or less, more preferably 0.01 to 2% by weight, further preferably 0.05 to 1.5% by weight, and further preferably 0. It is preferably 1 to 1% by weight, and most preferably 0.1 to 0.5% by weight. It is preferable in terms of durability that the weight ratio of the carboxyl group-containing monomer be 0.01% by weight or more. On the other hand, if it exceeds 2% by weight, it is not preferable from the viewpoint of reworkability.

The weight ratio of the hydroxyl group-containing monomer is preferably 3% by weight or less, more preferably 0.01 to 3% by weight, further preferably 0.1 to 2% by weight, further 0.2 to 2% by weight is preferred. It is preferable that the weight ratio of the hydroxyl group-containing monomer is 0.01% by weight or more from the viewpoint of crosslinking the pressure-sensitive adhesive layer, durability and adhesive properties. On the other hand, if it exceeds 3% by weight, it is not preferable in terms of durability.

As the copolymerization monomer, for example, aromatic ring-containing (meth)acrylate can be used. The aromatic ring-containing (meth)acrylate is a compound containing an aromatic ring structure in its structure and a (meth)acryloyl group. Examples of the aromatic ring include a benzene ring, a naphthalene ring and a biphenyl ring.

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

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

The weight ratio of the aromatic ring-containing (meth)acrylate is preferably 25% by weight or less, more preferably 3 to 25% by weight, further preferably 10 to 22% by weight, further 14 to 20% by weight. Is preferred. When the weight ratio of the aromatic ring-containing (meth)acrylate is 3% by weight or more, it is preferable for suppressing display unevenness. On the other hand, when it exceeds 25% by weight, unevenness in display is rather insufficiently suppressed and durability tends to decrease.

Specific examples of other copolymerizable monomers other than the above include; acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; allylsulfonic acid, 2-(meth)acrylamide-2. -Sulfonic acid group-containing monomers such as methyl propane sulfonic acid, (meth)acrylamide propane sulfonic acid, and sulfopropyl (meth)acrylate; and phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate.

Further, alkylaminoalkyl(meth)acrylates such as aminoethyl(meth)acrylate, N,N-dimethylaminoethyl(meth)acrylate, t-butylaminoethyl(meth)acrylate; methoxyethyl(meth)acrylate, ethoxyethyl( Alkoxyalkyl (meth)acrylates such as (meth)acrylate; N-(meth)acryloyloxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, N-(meth)acryloyl-8-oxyoctamethylenesuccinimide, etc. Succinimide-based monomers; N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, N-phenylmaleimide and other maleimide-based monomers; N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N- Itaconic imide-based monomers such as octyl itaconimide, N-2-ethylhexyl itaconimide, N-cyclohexyl itaconimide, and N-lauryl itaconimide, etc. are also mentioned as examples of monomers for modification.

Further, as a modifying monomer, 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; polyethylene glycol (meth). Glycol-based (meth)acrylates such as acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, methoxy polypropylene glycol (meth)acrylate; tetrahydrofurfuryl (meth)acrylate, fluorine (meth)acrylate, silicone (meth) ) Acrylate and (meth)acrylate monomers such as 2-methoxyethyl acrylate can also be used. Further, isoprene, butadiene, isobutylene, vinyl ether and the like can be mentioned.

Furthermore, examples of copolymerizable monomers other than the above include silane-based monomers containing a silicon atom. Examples of the silane-based monomer include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane. , 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, 10-acryloyloxydecyltriethoxysilane and the like.

Further, as the 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, neo Pentyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate , Polyfunctional having two or more unsaturated double bonds such as (meth)acryloyl groups and vinyl groups such as esterification products of (meth)acrylic acid such as caprolactone-modified dipentaerythritol hexa(meth)acrylate and polyhydric alcohols (Meth) acrylate, epoxy (in which two or more unsaturated double bonds such as (meth) acryloyl group and vinyl group are added to the skeleton of a polymerizable monomer, polyester, epoxy, urethane, etc. as a functional group similar to the monomer component, epoxy ( It is also possible to use (meth)acrylate, urethane (meth)acrylate and the like.

The ratio of the other copolymerizable monomer in the (meth)acrylic polymer (A) is about 0 to 10% in the weight ratio of all the constituent monomers (100% by weight) of the (meth)acrylic polymer (A). Further, it is preferably about 0 to 7%, further preferably about 0 to 5%.

The (meth)acrylic polymer (A) of the present invention generally preferably has a weight average molecular weight of 1,000,000 to 2,500,000. Considering durability, particularly heat resistance, the weight average molecular weight is preferably 1.2 million to 2,000,000. A weight average molecular weight of 1,000,000 or more is preferable in terms of heat resistance. If the weight average molecular weight is more than 2.5 million, the pressure-sensitive adhesive tends to be hard and peeling easily occurs. Further, the weight average molecular weight (Mw)/number average molecular weight (Mn) showing the molecular weight distribution is preferably 1.8 or more and 10 or less, further 1.8 to 7, and further 1.8 to. It is preferably 5. When the molecular weight distribution (Mw/Mn) exceeds 10, it is not preferable in terms of durability. The weight average molecular weight and the molecular weight distribution (Mw/Mn) can be determined from values calculated by polystyrene measurement by GPC (gel permeation chromatography).

For the production of such a (meth)acrylic polymer (A), a known production method such as solution polymerization, bulk polymerization, emulsion polymerization, various radical polymerization and the like can be appropriately selected. Further, the obtained (meth)acrylic polymer (A) may be any of a random copolymer, a block copolymer, a graft copolymer and the like.

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

The polymerization initiator, chain transfer agent, emulsifier and the like used in the radical polymerization are not particularly limited and can be appropriately selected and used. The weight average molecular weight of the (meth)acrylic polymer (A) can be controlled by the amount of polymerization initiator, the amount of chain transfer agent used, and the reaction conditions. It

The pressure-sensitive adhesive composition of the present invention contains an ionic compound (B). As the ionic compound (B), an alkali metal salt and/or an organic cation-anion salt can be preferably used. As the alkali metal salt, organic salts and inorganic salts of alkali metals can be used. The term "organic cation-anion salt" used in the present invention refers to an organic salt in which the cation portion is composed of an organic substance, and the anion portion may be an organic substance or an inorganic substance. You can have it. The "organic cation-anion salt" is also called an ionic liquid or an ionic solid.

<Alkali metal salt>
Examples of the alkali metal ion forming the cation part of the alkali metal salt include lithium, sodium and potassium ions. Among these alkali metal ions, lithium ion is preferable.

The anion part of the alkali metal salt may be composed of an organic material or an inorganic material. 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 -, - O 3 S (CF 2) 3 SO 3 -, PF 6 -, CO 3 2-, or the following general formula ( A) to (D),
_{(A) :( C n F 2n} + 1 SO 2) 2 N - ( where, n is 10 to 10 integer),
_{(B): CF 2 (C} m F 2m SO 2) 2 N - ( where, m is an integer of from 1 to 10),
^{_{(C): - O 3 S}} (CF 2) l SO 3 - ( where, l is an integer of from 1 to 10),
^{_{(D) :( C p F 2p}} + 1 SO 2) N - (C q F 2q + 1 SO 2), ( where, p, q is an integer of from 1 to 10), in represented by those such as are used. In particular, the anion moiety containing a fluorine atom is preferably used because an ionic compound having good ion dissociation can be 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. Examples of the anionic ^{_{portion, (CF 3 SO 2) 2}} N -, (C 2 F 5 SO 2) 2 N -, wherein represented by formula (A) etc., (perfluoroalkyl sulfonyl) imide are preferable, especially ( A bis(trifluoromethanesulfonyl)imide represented by CF ₃ SO ₂ ) ₂ N ⁻ and a bis(fluorosulfonyl)imide represented by (FSO ₂ ) ₂ N ⁻ are preferable.

The alkali metal organic salt, specifically, sodium acetate, sodium alginate, sodium lignin sulfonate, sodium 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, among these _{LiCF 3 SO 3, Li (CF} 3 SO 2) 2 N, Li (C 2 F 5 SO 2) 2 N, Li (C 4 _{F 9 SO 2) 2 N,} Li (CF 3 SO 2) 3 C and the like are _{preferable, Li (CF 3 SO 2)} 2 N, Li (C 2 F 5 SO 2) 2 N, Li (C 4 F 9 SO ₂ ) A fluorine-containing lithium imide salt that is a bis(fluorosulfonyl)imide lithium salt such as ₂ N is more preferable, and a (perfluoroalkylsulfonyl)imide lithium salt is particularly preferable. Other examples include 4,4,5,5-tetrafluoro-1,3,2-dithiazolidine-1,1,3,3-tetraoxide lithium salt.

Examples of the inorganic salt of alkali metal include lithium perchlorate and lithium iodide.

<Organic cation-anion salt>
The organic cation-anion salt used in the present invention is composed of a cation component and an anion component, and the cation component is an organic substance. As the cation 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 dihydropyrimidinium cation, Examples thereof include 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 -, - O 3 S (CF 2) 3 SO 3 -, or the following general formula (A) to (D ),
_{(A) :( C n F 2n} + 1 SO 2) 2 N - ( where, n is 0 to an integer of)
_{(B): CF 2 (C} m F 2m SO 2) 2 N - ( where, m is an integer of from 1 to 10),
_{^{(C): - O 3 S}} (CF 2) l SO 3 - ( where, l is an integer of from 1 to 10),
^{_{(D) :( C p F 2p}} + 1 SO 2) N - (C q F 2q + 1 SO 2), ( where, p, q is an integer of from 1 to 10), in represented by those such as are used. Among them, the anion component containing a fluorine atom is particularly preferably used because an ionic compound having a good ionic dissociation property can be obtained.

As the organic cation-anion salt, a compound composed of a combination of the above cation component and anion component is appropriately selected and used. Specific preferred examples of the organic cation-anion salt include, for example, methyltrioctylammonium bis(trifluoromethanesulfonyl)imide, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, ethylmethylimidazolium bis( Fluorosulfonylimide). Among them, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide and ethylmethylimidazolium bis(fluorosulfonylimide) are more preferable.

The ionic compound (B) may be an inorganic salt such as ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride or ammonium sulfate, in addition to the above-mentioned alkali metal salts and organic cation-anion salts. Is mentioned.

The ionic compound (B) may be used alone or in combination to obtain a desired resistance value. In particular, when it is intended to control the surface resistance value of the pressure-sensitive adhesive layer in the range of 1×10 ¹⁰ to 1×10 ¹² Ω/□, an alkali metal salt as the ionic compound (B) is an antistatic agent. It is preferable from the viewpoint of enhancing the performance, and by using the alkali metal salt, a pressure-sensitive adhesive having high antistatic performance can be obtained even with a small number of parts. On the other hand, when it is intended to control the surface resistance value of the pressure-sensitive adhesive layer in the range of 1×10 ⁸ to 1×10 ¹⁰ Ω/□, an organic cation-anion salt is used as the ionic compound (B). It is preferable in terms of enhancing antistatic performance, and by using an organic cation-anion salt, a pressure-sensitive adhesive having high antistatic performance can be obtained even with a smaller number of parts.

The proportion of the ionic compound (B) in the pressure-sensitive adhesive composition of the present invention can be appropriately adjusted so as to satisfy the antistatic property of the pressure-sensitive adhesive layer and the sensitivity of the touch panel. For example, containing an amide group introduced into the (meth)acrylic polymer (A) so that the surface resistance value of the pressure-sensitive adhesive layer is in the range of 1.0×10 ^{8 to} 1.0×10 ¹² Ω/□. It is preferable to adjust the ratio of the ionic compound (B) according to the type of the liquid crystal panel with a built-in touch sensing function, taking into consideration the weight ratio of the monomer (a2), the type of the transparent protective film of the polarizing film, and the like. For example, in the in-cell type liquid crystal panel with a touch sensing function shown in FIG. 1, the first adhesive layer is controlled to have an initial surface resistance value in the range of 1×10 ⁸ to 1×10 ¹⁰ Ω/□. preferable. In the semi-in-cell type liquid crystal panel with a built-in touch sensing function shown in FIG. 2 or the on-cell type shown in FIG. 3, the first adhesive layer has an initial surface resistance value of 1×10 ¹⁰ to 1×10 ¹² Ω/ It is preferable to control in the range of □.

Further, the first pressure-sensitive adhesive layer is controlled so as to satisfy the variation ratio (b/a)≦10 of the surface resistance value. The a is a first polarizing film with a pressure-sensitive adhesive layer, in which the first pressure-sensitive adhesive layer is provided on the transparent layer of the first polarizing film, and a separator is provided on the first pressure-sensitive adhesive layer. Is the surface resistance value of the first pressure-sensitive adhesive layer when the separator is peeled immediately after, and b is the first polarizing film with the pressure-sensitive adhesive layer put into a humidified environment of 60° C./95% RH for 250 hours. The surface resistance value of the first pressure-sensitive adhesive layer when the separator is peeled off after further drying at 40° C. for 1 hour. When the variation ratio (b/a) exceeds 10, the antistatic function of the pressure-sensitive adhesive layer in a humid environment is deteriorated. The fluctuation ratio (b/a) is preferably 5 or less, more preferably 3.5 or less, further preferably 2.5 or less, and further preferably 2 or less. , 1.5 or less is most preferable.

The ratio of the ionic compound (B) is preferably 0.01 parts by weight or more based on 100 parts by weight of the (meth)acrylic polymer (A). It is preferable to use 0.01 parts by weight or more of the ionic compound (B) in order to improve antistatic performance. From this viewpoint, the ionic compound (B) is preferably 0.1 part by weight or more, and more preferably 0.5 part by weight or more. On the other hand, when the amount of the ionic compound (B) is large, the surface resistance value becomes too low and the baseline fluctuation (malfunction at the time of touch caused by the surface resistance value being too low) may reduce the sensitivity of the touch panel. There is. In addition, when the amount of the ionic compound (B) is large, the ionic compound (B) may be precipitated, and further, peeling due to humidification is likely to occur. From this viewpoint, the amount of the ionic compound (B) is usually preferably 40 parts by weight or less, more preferably 30 parts by weight or less, further preferably 20 parts by weight or less, and 10 parts by weight or less. Most preferably.

The pressure-sensitive adhesive composition of the present invention can contain a crosslinking agent (C). As the crosslinking agent (C), an organic crosslinking agent or a polyfunctional metal chelate can be used. Examples of the organic crosslinking agent include isocyanate crosslinking agents, peroxide crosslinking agents, epoxy crosslinking agents, imine crosslinking agents and the like. The polyfunctional metal chelate is a polyvalent metal having a covalent bond or a coordinate bond with an organic compound. Examples of polyvalent metal atoms include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn and Ti. Can be mentioned. Examples of the atom in the organic compound that forms a covalent bond or a coordinate bond 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.

The crosslinking agent (C) is preferably an isocyanate crosslinking agent and/or a peroxide crosslinking agent.

As the isocyanate cross-linking agent (C), a compound having at least two isocyanate groups can be used. For example, a known aliphatic polyisocyanate, alicyclic polyisocyanate, aromatic polyisocyanate or the like which is generally used for urethanization reaction is used.

The peroxide can be appropriately used as long as it generates a radical active species by heating or light irradiation to promote crosslinking of the base polymer of the pressure-sensitive adhesive composition, but in consideration of workability and stability. It is preferable to use a peroxide having a one-minute half-life temperature of 80°C to 160°C, more preferably 90°C to 140°C.

Examples of peroxides that can be used include 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-butyl peroxydicarbonate (1 minute half-life temperature: 92.4° C.), t-butyl peroxy neodecanoate (1 minute half-life temperature: 103 0.5° C.), t-hexyl peroxypivalate (1 minute half-life temperature: 109.1° C.), t-butyl peroxypivalate (1 minute half-life temperature: 110.3° C.), dilauroyl peroxide ( 1-minute half-life temperature: 116.4°C), di-n-octanoyl peroxide (1-minute half-life temperature: 117.4°C), 1,1,3,3-tetramethylbutylperoxy-2-ethyl Hexanoate (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-hexylperoxy)cyclohexane (1 minute half-life temperature: 149.2° C.) Etc. Among these, since the crosslinking reaction efficiency is particularly excellent, di(4-t-butylcyclohexyl)peroxydicarbonate (1 minute half-life temperature: 92.1° C.), dilauroyl peroxide (1 minute half-life temperature: 116. 4° C.), dibenzoyl peroxide (1 minute half-life temperature: 130.0° C.) and the like are preferably used.

The amount of the cross-linking agent (C) used is preferably 3 parts by weight or less, more preferably 0.01 to 3 parts by weight, and further preferably 0.02 with respect to 100 parts by weight of the (meth)acrylic polymer (A). Is preferably 2 to 2 parts by weight, more preferably 0.03 to 1 part by weight. When the amount of the cross-linking agent (C) is less than 0.01 part by weight, the pressure-sensitive adhesive layer may be insufficiently cross-linked, and durability and adhesive properties may not be satisfied. It tends to be too hard and the durability tends to decrease.

The pressure-sensitive adhesive composition of the present invention may contain a silane coupling agent (D). The durability can be improved by using the silane coupling agent (D). Specific examples of the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2-(3. Epoxy group-containing silane coupling agent such as 4-epoxycyclohexyl)ethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl- Amino group-containing silane coupling agents such as N-(1,3-dimethylbutylidene)propylamine, N-phenyl-γ-aminopropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-methacryloxypropyltri Examples thereof include (meth)acrylic group-containing silane coupling agents such as ethoxysilane, and isocyanate group-containing silane coupling agents such as 3-isocyanatopropyltriethoxysilane. The silane coupling agent exemplified above is preferably an epoxy group-containing silane coupling agent.

Further, as the silane coupling agent (D), one having a plurality of alkoxysilyl groups in the molecule can be used. Specifically, for example, Shin-Etsu Chemical Co., Ltd. X-41-1053, X-41-1059A, X-41-1056, X-41-1805, X-41-1818, X-41-1810, X-40. -2651 etc. are mentioned. A silane coupling agent having a plurality of alkoxysilyl groups in these molecules is less likely to volatilize and has a plurality of alkoxysilyl groups, which is effective in improving durability and is preferable. In particular, the durability is also suitable when the adherend of the optical film with a pressure-sensitive adhesive layer is a transparent conductive layer (for example, ITO) in which an alkoxysilyl group is less likely to react than glass. The silane coupling agent having a plurality of alkoxysilyl groups in the molecule preferably has an epoxy group in the molecule, and more preferably has a plurality of epoxy groups in the molecule. 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 (for example, ITO). Specific examples of the silane coupling agent having a plurality of alkoxysilyl groups in the molecule and having an epoxy group include X-41-1053, X-41-1059A and X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd. In particular, X-41-1056 manufactured by Shin-Etsu Chemical Co., which has a high epoxy group content, is preferable.

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

The pressure-sensitive adhesive composition of the present invention may contain a polyether compound (E) having a reactive silyl group. The polyether compound (E) is preferable because the reworkability can be improved. As the polyether compound (E), for example, those disclosed in JP 2010-275522A can be used.

The proportion of the polyether compound (E) in the pressure-sensitive adhesive composition of the present invention is preferably 10 parts by weight or less, and more preferably 0.001 to 10 parts by weight, based on 100 parts by weight of the (meth)acrylic polymer (A). .. When the amount of the polyether compound (E) is less than 0.001 part by weight, the effect of improving reworkability may not be sufficient. The polyether compound (E) is preferably 0.01 part by weight or more, and more preferably 0.1 part by weight or more. On the other hand, if the amount of the polyether compound (E) is more than 10 parts by weight, it is not preferable in terms of durability. The polyether compound (E) is preferably 5 parts by weight or less, and more preferably 2 parts by weight or less. The ratio of the polyether compound (E) can be set to a preferable range by adopting the upper limit value or the lower limit value.

Further, the pressure-sensitive adhesive composition of the present invention may contain other known additives, for example, polyalkylene glycol polyether compounds such as polypropylene glycol, colorants, powders such as pigments, dyes, Surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, antioxidants, light stabilizers, UV absorbers, polymerization inhibitors, inorganic or organic fillers, metals Powders, particles, foils and the like can be appropriately added depending on the intended use. Further, a redox system to which a reducing agent is added may be adopted within a controllable range. These additives are preferably used in an amount of 5 parts by weight or less, more preferably 3 parts by weight or less, and further preferably 1 part by weight or less with respect to 100 parts by weight of the (meth)acrylic polymer (A).

The first adhesive layer 21 of the present invention can be used as an optical film with an adhesive layer attached to an optical film (polarizing film). The optical film with a pressure-sensitive adhesive layer can be obtained by forming a pressure-sensitive adhesive layer with the pressure-sensitive adhesive composition on at least one surface of the optical film.

As a method for forming the pressure-sensitive adhesive layer, for example, the pressure-sensitive adhesive composition is applied to a release-treated separator or the like, and a polymerization solvent or the like is dried and removed to form a pressure-sensitive adhesive layer, which is then transferred to an optical film (polarizing film). Or a method of forming the pressure-sensitive adhesive layer on the optical film by applying the pressure-sensitive adhesive composition to an optical film (polarizing film) and drying and removing the polymerization solvent. When applying the pressure-sensitive adhesive, one or more solvents other than the polymerization solvent may be newly added as appropriate.

The thickness of the first pressure-sensitive adhesive layer 21 is not particularly limited and is, for example, about 1 to 100 μm. The thickness is preferably 2 to 50 μm, more preferably 2 to 40 μm, and further preferably 5 to 35 μm.

<Conductive layer>
The thickness of the conductive layer d is preferably 1 μm or less, and more preferably 0.01 to 0.5 μm, from the viewpoint of the stability of the surface resistance value and the adhesiveness with the first pressure-sensitive adhesive layer 21. The thickness is preferably 0.01 to 0.2 μm, more preferably 0.01 to 0.1 μm. The surface resistance of the conductive layer d from the viewpoint of antistatic function, is ^{1 × 10 8 ~1 × 10 12} Ω in the range of / □ and ^{preferably, 1 × 10 8 ~1 × 10} 11 Ω / □ Is more preferable, and it is more preferable that it is 1×10 ⁸ to 1×10 ¹⁰ Ω.

The conductive layer can be formed from various antistatic agent compositions. As the antistatic agent forming the conductive layer, an ionic surfactant system, a conductive polymer, conductive fine particles, carbon nanotubes, etc. can be used.

Among these antistatic agents, conductive polymers and carbon nanotubes are preferably used from the viewpoints of optical properties, appearance, antistatic effect and stability of antistatic effect when heated and when humidified. In particular, conductive polymers such as polyaniline and polythiophene are preferably used. As the conductive polymer, those soluble in an organic solvent, water-soluble, and water-dispersible can be appropriately used, but a water-soluble conductive polymer or a water-dispersible conductive polymer is preferably used. The water-soluble conductive polymer or the water-dispersible conductive polymer can be prepared as an aqueous solution or an aqueous dispersion of the coating liquid for forming the antistatic layer, the coating liquid does not need to use a non-aqueous organic solvent, This is because the deterioration of the optical film substrate due to the solvent can be suppressed. The aqueous solution or the aqueous dispersion may contain an aqueous solvent in addition to 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-ethyl-1. -Alcohols such as propanol, 2-methyl-1-butanol, n-hexanol and cyclohexanol can be mentioned.

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

Examples of commercially available water-soluble conductive polymers include polyanilinesulfonic acid (manufactured by Mitsubishi Rayon Co., Ltd., weight average molecular weight of 150,000 by polystyrene conversion) and the like. Examples of commercially available water-dispersible conductive polymers include polythiophene-based conductive polymers (trade name, Denatron series, manufactured by Nagase Chemtech).

As a material for forming the conductive layer, a binder component may be added together with the antistatic agent for the purpose of improving the film forming property of the antistatic agent, improving the adhesion to the optical film, and the like. 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, oxazoline group-containing polymer, polyurethane resin, polyester resin, acrylic resin, polyether resin, cellulose resin, polyvinyl alcohol resin, epoxy resin, polyvinylpyrrolidone, polystyrene resin, polyethylene glycol, Examples include pentaerythritol. Polyurethane resin, polyester resin, and acrylic resin are particularly preferable. These binders may be used alone or in combination of two or more, as appropriate for the intended use.

The amount of the antistatic agent and the binder used depends on their types, but it is preferable to control the surface resistance value of the obtained conductive layer to be 1×10 ⁸ to 1×10 ¹² Ω/□.

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

<Measurement of weight average molecular weight of (meth)acrylic polymer (A)>
The weight average molecular weight (Mw) of the (meth)acrylic polymer (A) was measured by GPC (gel permeation chromatography). Mw/Mn was also measured in the same manner. Further, it was similarly applied (other than the solvent) to the measurement of the weight average molecular weight of the polymer (a) and the like.
・Analyzer: Tosoh Corp., HLC-8120GPC
・Column: manufactured by Tosoh Corporation, G7000H _XL + GMH _XL + GMH _XL
・Column size: 7.8mmφ×30cm each, 90cm in total
・Column temperature: 40℃
・Flow rate: 0.8 mL/min
・Injection volume: 100 μL
・Eluent: Tetrahydrofuran ・Detector: Differential refractometer (RI)
・Standard sample: polystyrene

(Production of thin polarizer A)
Amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 μm) having a water absorption of 0.75% and a Tg of 75° C. was corona-treated on one side of the base material, and the corona-treated surface was treated with polyvinyl chloride. Alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd. An aqueous solution containing the trade name "Gosephimmer Z200") in a ratio of 9:1 was applied at 25°C and dried to form a PVA-based resin layer having a thickness of 11 µm, and a laminate was prepared.
The obtained laminated body was uniaxially stretched by 2.0 times in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 120° C. (in-air auxiliary stretching treatment).
Then, the laminated body was immersed in an insolubilizing bath having a liquid temperature of 30° C. (boric acid aqueous solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) for 30 seconds (insolubilization treatment).
Then, the polarizing plate was immersed in a dyeing bath having a liquid temperature of 30° C. while adjusting the iodine concentration and the immersion time so that the polarizing plate had a predetermined transmittance. In this example, 0.2 part by weight of iodine was added to 100 parts by weight of water, and 1.0 part by weight of potassium iodide was added, and the resultant was immersed for 60 seconds in an aqueous iodine solution (dyeing treatment). ..
Then, it was immersed for 30 seconds in a crosslinking bath at a liquid temperature of 30° C. (boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with 100 parts by weight of water). (Crosslinking treatment).
Then, the laminate was immersed in an aqueous boric acid solution having a liquid temperature of 70° C. (an aqueous solution obtained by mixing 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with 100 parts by weight of water). On the other hand, uniaxial stretching was performed between rolls having different peripheral speeds in the longitudinal direction (longitudinal direction) so that the total stretching ratio was 5.5 times (underwater stretching treatment).
After that, the laminate was immersed in a cleaning bath having a liquid temperature of 30° C. (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) (cleaning treatment).
As described above, an optical film laminate including a polarizer having a thickness of 5 μm was obtained.

(Transparent protective film)
A 25 μm thick triacetyl cellulose resin film was used.

(Preparation 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 (ARUFONUP1190, manufactured by Toagosei Co., Ltd.) obtained by polymerizing a (meth)acrylic monomer, a photopolymerization initiator (IRGACURE 907, BASF). 3 parts) and a polymerization initiator (KAYACURE DETX-S, manufactured by Nippon Kayaku Co., Ltd.) 1.5 parts were mixed to prepare an ultraviolet curable adhesive.

(Transparent layer forming material)
Forming material A: 75% ethyl acetate solution of urethane prepolymer consisting of tolylene diisocyanate (TDI) and trimethylolpropane (TMP) as a solution of urethane prepolymer (a) (Tosoh Corporation, trade name "Coronate L") Was used.
On the other hand, trimethylolpropane was dissolved in cyclopentanone so that the solid content concentration was 10% to prepare a trimethylolpropane solution.
The above trimethylolpropane solution was added to 100 parts of a 75% ethyl acetate solution of the above urethane prepolymer (manufactured by Tosoh Corporation, trade name "Coronate L"), and the solid content ratio of the urethane prepolymer:trimethylolpropane was 90: 10 parts, dioctyl tin dilaurate catalyst (manufactured by Tokyo Fine Chemicals Co., Ltd., trade name "Enbilizer OL-1") 0.1 part, and methyl isobutyl ketone as a solvent to give a solid content of 10%. The forming material (coating liquid) prepared in 1. was prepared.

Forming material B: Dioctyl tin dilaurate catalyst (manufactured by Tokyo Fine Chemical Co., trade name, manufactured by Tokyo Fine Chemical Co., Ltd.) in 100 parts of 75% ethyl acetate solution of urethane prepolymer consisting of tolylene diisocyanate and trimethylolpropane 0.1 part of "Enbilizer OL-1" was added, and a urethane prepolymer coating liquid was prepared with methyl isobutyl ketone as a solvent to a solid content concentration of 10%.

Forming material C: 80 parts of urethane acrylate resin (Nippon Gosei Co., Ltd., product name "Shikou UV-1700"), 20 parts of N-hydroxyethylacrylamide (Kokijin Co., Ltd., trade name "HEAA"), and initiation of photopolymerization 3 parts of an agent (IRGACURE 907 manufactured by BASF) was added, and a urethane acrylate coating solution was prepared with methyl isobutyl ketone as a solvent to a solid content concentration of 10%.

Forming material D: 97.0 parts of methyl methacrylate, 3.0 parts of the monomer represented by the general formula (1) (monomer of the general formula (1e)), polymerization initiator (2,2'- 0.2 part of azobis(isobutyronitrile) was dissolved in 200 parts of toluene. Then, the polymerization reaction was carried out for 5 hours while heating at 70° C. in a nitrogen atmosphere to obtain a polymer (a) (solid content concentration: 33% by weight). The weight average molecular weight of the obtained polymer (a) was 85,000.
15 parts of the polymer (a) and 85 parts of an epoxy resin (trade name: jER (registered trademark) YX7200B35 manufactured by Mitsubishi Chemical Co., Ltd.) are mixed to prepare an acrylic-epoxy resin forming material (coating liquid). did.

Forming material E: A polyvinyl alcohol resin having a degree of polymerization of 2500 and a degree of saponification of 99.0% (trade name: JC-25, manufactured by Nippon Vineline Poval Co., Ltd.) is purely dissolved to prepare an aqueous solution having a solid content concentration of 4% by weight. Prepared.

(Preparation of material for forming conductive layer)
8.6 parts of a 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: Epocros) 1 part of WS-700, manufactured by Nippon Shokubai Co., Ltd. and 90.4 parts of water were mixed to prepare a conductive layer forming coating solution having a solid content concentration of 0.5% by weight. The obtained coating liquid for forming a conductive layer contained 0.04% by weight of a polythiophene-based polymer and 0.25% by weight of an oxazoline group-containing acrylic polymer.

Example 1
(Preparation of acrylic polymer (A))
In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser, 96.2 parts of butyl acrylate, 3 parts of N-vinyl-2-pyrrolidone, 0.5 part of 4-hydroxybutyl acrylate, and acrylic. A monomer mixture containing 0.3 parts of acid was charged. Further, with respect to 100 parts of the monomer mixture (solid content), 0.1 part of 2,2′-azobisisobutyronitrile as a polymerization initiator was charged together with 100 parts of ethyl acetate, and nitrogen gas was added with gentle stirring. After introducing and purging with nitrogen, a polymerization reaction was carried out for 8 hours while maintaining the liquid temperature in the flask at around 55° C. to obtain a solution of an acrylic polymer having a weight average molecular weight (Mw) of 1.6 million and Mw/Mn=3.7. Was prepared.

(Preparation of adhesive composition)
With respect to 100 parts of the solid content of the solution of the acrylic polymer obtained above, 7 parts of ethylmethylimidazolium bis(fluorosulfonylimide) as an ionic compound (B), an isocyanate cross-linking agent (Takenate manufactured by Mitsui Chemicals, Inc.) D160N, trimethylolpropane hexamethylene diisocyanate) 0.1 part, benzoyl peroxide (NIPPER BMT manufactured by NOF CORPORATION) 0.3 part, and epoxy group-containing silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd.: X-41-1056). ) 0.3 parts were blended to prepare a solution of the acrylic pressure-sensitive adhesive composition.

(Preparation of adhesive layer)
Then, the solution of the acrylic pressure-sensitive adhesive composition was applied to one surface of a polyethylene terephthalate film (separator film: manufactured by Mitsubishi Kagaku Polyester Film Co., Ltd., MRF38) treated with a silicone-based release agent to form a pressure-sensitive adhesive layer after drying. It was applied to a thickness of 20 μm and dried at 155° C. for 1 minute to form an adhesive layer on the surface of the separator film.

<Preparation of one-sided protective polarizing film>
The transparent protective film (acrylic) was laminated on the surface of the polarizer A of the optical film laminate while applying the ultraviolet curable adhesive a so that the thickness of the cured adhesive layer was 1 μm. After that, ultraviolet rays were irradiated as an active energy ray to cure the adhesive. Ultraviolet irradiation is performed using a gallium-encapsulated metal halide lamp, irradiation device: Fusion UV Systems, Inc. Light HAMMER10, bulb: V bulb, peak illuminance: 1600 mW/cm ² , integrated irradiation amount 1000/mJ/cm ² (wavelength 380 to 440 nm). ) Was used, and the illuminance of ultraviolet rays was measured using a Sola-Check system manufactured by Solatell. Then, the amorphous PET substrate was peeled off to prepare a one-sided protective polarizing film using a thin polarizer. The optical properties of the obtained one-sided protective polarizing film were a single substance transmittance of 42.8% and a polarization degree of 99.99%.

<Preparation of a one-sided protective polarizing film with a transparent layer>
By applying the transparent layer forming material A on the surface of the polarizer of the above-mentioned one-sided protective polarizing film (the surface of the polarizer on which the transparent protective film is not provided) with a bar coater, heat treatment is performed at 60° C. for 5 minutes. Then, a urethane resin layer having a thickness of 3 μm was formed.

<Preparation of one-sided protective polarizing film with adhesive layer>
Then, the pressure-sensitive adhesive layer formed on the separator film was transferred to the transparent layer formed on the one-sided protective polarizing film to prepare a one-sided protective polarizing film with an adhesive layer.

Examples 2-18, Comparative Examples 1-3
In Example 1, as shown in Table 1, the composition of the monomer mixture used in the preparation of the acrylic polymer (A), the type of the ionic compound (B) used in the preparation of the pressure-sensitive adhesive composition (EMI-FSI or Li-TFSI) or the compounding ratio thereof, the thickness of the pressure-sensitive adhesive layer, the type or thickness of the material for forming the transparent layer, and the presence or absence of the conductive layer were changed as shown in Table 1 and in the same manner as in Example 1. A one-sided protective polarizing film with a transparent layer and a one-sided protective polarizing film with an adhesive layer were produced.

The transparent layer of Example 5 was obtained by applying the transparent layer forming material B on the surface of the polarizer of the one-sided protective polarizing film (polarizer surface not provided with the transparent protective film) by a bar coater, By performing heat treatment at 60° C. for 12 hours, a urethane resin layer having a thickness of 3 μm was formed. The transparent layer of Example 6 was formed by applying the forming agent C to the surface of the polarizer of the one-sided protective polarizing film (the surface of the polarizer not provided with the transparent protective film) with a bar coater, and then applying 90 Heated at 0°C for 1 minute. After heating, the coating layer was irradiated with ultraviolet rays having a cumulative light intensity of 300 mJ/cm ² with a high pressure mercury lamp to form a urethane acrylate resin layer having a thickness of 1 μm.
In addition, the transparent layers of Examples 16 to 18 were formed by applying the transparent layer forming material D to the surface of the polarizer of the one-sided protective polarizing film (polarizer surface not provided with the transparent protective film) with a bar coater. Then, heat treatment was performed at 60° C. for 2 minutes to form a transparent layer having a thickness of 0.5 μm.
The transparent layer of Comparative Example 2 was formed by coating the surface of the polarizer of the one-sided protective polarizing film (the surface of the polarizer on which the transparent protective film was not provided) with the forming agent E using a bar coater, and then at 60° C. It was carried out by heating for 3 minutes to form a polyvinyl alcohol resin layer having a thickness of 1.5 μm.
In Comparative Examples 1 and 3, no transparent layer was formed.

In Example 15, the conductive layer-forming coating liquid was applied onto the transparent layer of the transparent protective film with transparent layer so that the thickness after drying was 0.06 μm, and dried at 80° C. for 2 minutes. A conductive layer was formed. The obtained conductive layer contained 8 wt% and 50 wt% of a thiophene-based polymer and an oxazoline group-containing acrylic polymer, respectively.
The surface resistance value of the conductive layer was measured on the surface of the conductive layer before forming the adhesive layer and the surface of the polarizing film with the transparent layer on the conductive layer side. The measurement was performed using MCP-HT450 manufactured by Mitsubishi Chemical Analytech.

The following evaluations were performed on the pressure-sensitive adhesive layer-attached one-sided protective polarizing films obtained in the above Examples and Comparative Examples. The evaluation results are shown in Table 1. In each evaluation, "initial" is immediately after the pressure-sensitive adhesive layer-attached one-sided polarizing film or liquid crystal panel is produced, and "after humidification" is 60%/95% of the obtained pressure-sensitive adhesive layer-attached polarizing film or liquid crystal panel. The values are measured for 250 hours in a humid environment of RH and further dried at 40° C. for 1 hour, and then measured.

<Surface resistance value (Ω/□): conductivity>
After the separator film was peeled off from the pressure-sensitive adhesive layer-attached polarizing film, the surface resistance value of the pressure-sensitive adhesive layer surface was measured. The measurement was performed using MCP-HT450 manufactured by Mitsubishi Chemical Analytech. The surface resistance value of the pressure-sensitive adhesive layer surface of Example 15 is a value measured from the surface of the conductive pressure-sensitive adhesive layer in the state where both the conductive layer and the conductive pressure-sensitive adhesive layer are present.
The fluctuation ratio (b/a) in Table 1 is a value calculated from the “initial” surface resistance value (a) and the “after humidification” surface resistance value (b) (rounded to the second decimal place). Value).
Further, the value of small variation ratio was evaluated as an index with less possibility of "malfunction", based on the following criteria.
A: The fluctuation ratio is 2 or less.
B: The variation ratio exceeds 2, and is less than 10.
C: The fluctuation ratio is 10 or more.

<ESD test>
After peeling the separator film from the one-sided protective polarizing film with an adhesive layer, the separator film was attached to the viewing side of an in-cell type liquid crystal cell or an on-cell type liquid crystal cell as shown in Table 1 to prepare a liquid crystal panel with a touch sensing function. That is, the polarizing films with pressure-sensitive adhesive layers obtained in Examples 1 to 10 and 15 and Comparative Examples 1 to 2 were bonded to the first transparent substrate of the in-cell type liquid crystal cell shown in FIG. And the 1st polarizing film was formed. The polarizing films with pressure-sensitive adhesive layers obtained in Examples 11 to 14 and Comparative Example 3 were attached to the sensor layer (touch sensor portion) of the on-cell type liquid crystal cell shown in FIG. 3 to form the first pressure-sensitive adhesive layer and the first pressure-sensitive adhesive layer. A polarizing film was formed. In the liquid crystal panel, an ESD (electrostatic discharge) gun (10 kV) was fired on the surface of the polarizing film, and the time until the white spots due to electricity disappeared was measured and judged according to the following criteria.
(Evaluation criteria)
A: Within 1 second.
B: Over 1 second to within 3 seconds.
C: over 3 seconds to within 10 seconds.
D: exceeds 10 seconds.

In Table 1,
BA is butyl acrylate,
NVP is N-vinyl-2-pyrrolidone,
HBA is 4-hydroxybutyl acrylate,
AA is acrylic acid,
EMI-FSI is ethylmethylimidazolium bis(fluorosulfonylimide),
Li-TFSI represents bis(trifluoromethanesulfonyl)imide lithium.

As shown in Table 1, from the description of Examples and Comparative Examples, when the one-sided protective polarizing film was used, the initial surface resistance value of the pressure-sensitive adhesive layer was lowered by adding an ionic compound to the acrylic polymer. Even when set, in the example in which the one-sided protective polarizing film has a predetermined transparent layer, the fluctuation ratio of the surface resistance value of the pressure-sensitive adhesive layer after humidification can be controlled to 10 or less, and the surface resistance value is increased. You can see that it can be suppressed. That is, in the examples, since the variation ratio of the surface resistance value of the pressure-sensitive adhesive layer is small, it is possible to maintain the surface resistance value within a desired range even after humidification, and it is possible to maintain good touch panel sensitivity. Furthermore, the ESD test is good, and it is possible to suppress static electricity unevenness.

11, 12 1st, 2nd polarizing film 21, 22 1st, 2nd adhesive layer 3 Liquid crystal layer 41, 42 1st, 2nd transparent substrate 5 Touch sensor part 6 Drive electrode/sensor part 7 Drive electrode C Liquid crystal cell a polarizer b transparent protective film c transparent layer d conductive layer

Claims (24)

A liquid crystal cell with a touch sensing function, which has a liquid crystal layer and a touch sensor section,
A first polarizing film arranged on the viewer side of the liquid crystal cell and a second polarizing film arranged on the opposite side of the viewer side; and
In a liquid crystal panel with a built-in touch sensing function, the liquid crystal panel having a first adhesive layer disposed between the first polarizing film and the liquid crystal cell,
The first polarizing film has a polarizer, a transparent protective film only on one side of the polarizer, and a transparent layer on the other side of the polarizer, and the first polarizing film has the transparent layer interposed therebetween. It is provided on the first adhesive layer,
The transparent layer,
(A) Acrylic monomer in excess of 50 parts by weight and general formula (1) in excess of 0 parts by weight and less than 50 parts by weight:
(In the formula, X is a group consisting of vinyl group, (meth)acrylic group, styryl group, (meth)acrylamide group, vinyl ether group, epoxy group, oxetane group, hydroxyl group, amino group, aldehyde group, and carboxyl group. It represents a functional group containing at least one reactive group selected, and R ¹ and R ² are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a substituent. Represents an optionally substituted aryl group or a heterocyclic group optionally having a substituent, and R ¹ and R ² may be linked to each other to form a ring) A polymer obtained by polymerizing and
(B) an epoxy resin, which is a resin composition comprising:
The content ratio of the polymer (a) and the epoxy resin (b) is 95:5 to 60:40 by weight, or 40:60 to 1:99,
The first pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B), and
The first adhesive layer has a surface resistance variation ratio (b/a)≦10,
(However, the a, the first pressure-sensitive adhesive layer is provided on the first the transparent layer of the polarizing film, and a first polarization pressure-sensitive adhesive layer in a state where the separator to the first pressure-sensitive adhesive layer is provided The surface resistance value of the first pressure-sensitive adhesive layer when the separator was peeled off immediately after producing the film, the b was the first polarizing film with the pressure-sensitive adhesive layer for 250 hours in a humidified environment of 60° C./95% RH. A liquid crystal panel with a built-in touch sensing function, which satisfies the respective surface resistance values of the first pressure-sensitive adhesive layer when the separator is peeled off after being charged and further dried at 40° C. for 1 hour. The liquid crystal panel with a built-in touch sensing function according to claim 1, wherein the transparent layer is directly formed on the polarizer. The liquid crystal panel with a built-in touch sensing function according to claim 1, wherein the transparent layer has a thickness of 10 μm or less. The functional group represented by X in the general formula (1) is
General formula (2): Z-Y- (In the formula, Z is vinyl group, (meth)acrylic group, styryl group, (meth)acrylamide group, vinyl ether group, epoxy group, oxetane group, hydroxyl group, amino group, aldehyde. Group and a functional group containing at least one reactive group selected from the group consisting of a carboxyl group, and Y represents an organic group). 4. A liquid crystal panel with a built-in touch sensing function according to any one of 3 to 3. The said (meth)acrylic-type polymer (A) contains an alkyl (meth)acrylate (a1) and an amide group containing monomer (a2) as a monomer unit, It is characterized by the above-mentioned. LCD panel with built-in touch sensing function. The liquid crystal panel with a built-in touch sensing function according to claim 5, wherein the amide group-containing monomer (a2) is an N-vinyl group-containing lactam monomer. The touch sensing according to claim 5, wherein the amide group-containing monomer (a2) is contained as a monomer unit in the (meth)acrylic polymer (A) in an amount of 0.1% by weight or more. LCD panel with built-in functions. The ionic compound (B) is an alkali metal salt, and the surface resistance value of the first pressure-sensitive adhesive layer relating to the a is 1×10 ¹⁰ to 1×10 ¹² Ω/□. Item 8. A liquid crystal panel with a touch sensing function according to any one of items 1 to 7. The ionic compound (B) is an organic cation-anion salt, and the surface resistance value of the first pressure-sensitive adhesive layer according to the a is 1×10 ⁸ to 1×10 ¹⁰ Ω/□. The liquid crystal panel with a built-in touch sensing function according to claim 1. 10. The ionic compound (B) is contained in an amount of 0.01 part by weight or more based on 100 parts by weight of the (meth)acrylic polymer (A). LCD panel with built-in touch sensing function. The liquid crystal panel with a built-in touch sensing function according to claim 1, further comprising a conductive layer between the transparent layer and the first adhesive layer. The liquid crystal panel with a built-in touch sensing function according to claim 1, wherein the touch sensor unit and the first adhesive layer are in direct contact with each other. A liquid crystal display device comprising the liquid crystal panel with a built-in touch sensing function according to claim 1. Polarizer, a transparent protective film only on one side of the polarizer, and a transparent layer on the other side of the polarizer, and a pressure-sensitive adhesive layer-provided polarization provided with a pressure-sensitive adhesive layer through the transparent layer A film,
The transparent layer,
(A) Acrylic monomer in excess of 50 parts by weight and general formula (1) in excess of 0 parts by weight and less than 50 parts by weight:
(In the formula, X is a group consisting of vinyl group, (meth)acrylic group, styryl group, (meth)acrylamide group, vinyl ether group, epoxy group, oxetane group, hydroxyl group, amino group, aldehyde group, and carboxyl group. It represents a functional group containing at least one reactive group selected, and R ¹ and R ² are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a substituent. Represents an optionally substituted aryl group or a heterocyclic group optionally having a substituent, and R ¹ and R ² may be linked to each other to form a ring) A polymer obtained by polymerizing and
(B) an epoxy resin, which is a resin composition comprising:
The content ratio of the polymer (a) and the epoxy resin (b) is 95:5 to 60:40 by weight, or 40:60 to 1:99,
The pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B), and
The pressure-sensitive adhesive layer has a surface resistance variation ratio (b/a)≦10,
(However, the a is the surface of the pressure-sensitive adhesive layer when the separator is peeled immediately after producing the pressure-sensitive adhesive layer-attached polarizing film in a state where the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer-attached polarizer is provided with a separator. The resistance value is the b, after the pressure-sensitive adhesive layer-attached polarizing film in the state where the separator is provided is put in a humidified environment of 60° C./95% RH for 250 hours, and further dried at 40° C. for 1 hour. The pressure-sensitive adhesive layer-attached polarizing film satisfies the surface resistance values of the pressure-sensitive adhesive layer when the separator is peeled off. The polarizing film with a pressure-sensitive adhesive layer according to claim 14, wherein the transparent layer is directly formed on the polarizer. The polarizing film with an adhesive layer according to claim 14 or 15, wherein the transparent layer has a thickness of 10 µm or less. The functional group represented by X in the general formula (1) is
General formula (2): Z-Y- (In the formula, Z is vinyl group, (meth)acrylic group, styryl group, (meth)acrylamide group, vinyl ether group, epoxy group, oxetane group, hydroxyl group, amino group, aldehyde. Group and a functional group containing at least one reactive group selected from the group consisting of a carboxyl group, and Y represents an organic group). A polarizing film with a pressure-sensitive adhesive layer according to any one of to 16. The said (meth)acrylic-type polymer (A) contains an alkyl (meth)acrylate (a1) and an amide group containing monomer (a2) as a monomer unit, It is characterized by the above-mentioned. Polarizing film with adhesive layer. The polarizing film with a pressure-sensitive adhesive layer according to claim 18, wherein the amide group-containing monomer (a2) is an N-vinyl group-containing lactam monomer. 20. The pressure-sensitive adhesive according to claim 18, wherein the amide group-containing monomer (a2) is contained as a monomer unit in the (meth)acrylic polymer (A) in an amount of 0.1% by weight or more. Polarizing film with layers. The ionic compound (B) is an alkali metal salt, and the surface resistance value of the pressure-sensitive adhesive layer relating to the a is 1×10 ¹⁰ to 1×10 ¹² Ω/□. The polarizing film with a pressure-sensitive adhesive layer according to any one of 14 to 20. The ionic compound (B) is an organic cation-anion salt, and the surface resistance value of the pressure-sensitive adhesive layer according to the a is 1×10 ⁸ to 1×10 ¹⁰ Ω/□. The polarizing film with an adhesive layer according to any one of claims 14 to 20. 23. The ionic compound (B) is contained in an amount of 0.01 part by weight or more based on 100 parts by weight of the (meth)acrylic polymer (A). Polarizing film with adhesive layer. The pressure-sensitive adhesive layer-attached polarizing film according to any one of claims 14 to 23, comprising a conductive layer between the transparent layer and the pressure-sensitive adhesive layer .