CN113366351A

CN113366351A - Polarizing film with adhesive layer, image display panel, and image display device

Info

Publication number: CN113366351A
Application number: CN201980090170.4A
Authority: CN
Inventors: 木村智之; 小野宽大; 山本悟士; 外山雄祐
Original assignee: Nitto Denko Corp
Current assignee: Nitto Denko Corp
Priority date: 2019-03-20
Filing date: 2019-10-30
Publication date: 2021-09-07
Anticipated expiration: 2039-10-30
Also published as: CN113366351B; JP7467060B2; KR20210140738A; JP2020160427A; TWI814940B; TW202036036A

Abstract

The present invention relates to a polarizing film with an adhesive layer, which comprises a polarizing film having a polarizer and a protective film provided on one or both surfaces of the polarizer, a conductive layer, and an adhesive layer in this order, wherein the polarizing film with the adhesive layer has a deformed portion other than a rectangular portion, and the adhesive layer is formed from an adhesive composition containing a (meth) acrylic polymer (a) and an ionic compound (B). The polarizing film with an adhesive layer having an irregular portion according to the present invention can suppress the occurrence of irregular cracks and suppress static unevenness even when applied to an in-cell liquid crystal panel.

Description

Polarizing film with adhesive layer, image display panel, and image display device

Technical Field

The present invention relates to an adhesive layer-attached polarizing film having an irregularly shaped portion other than a rectangular portion. The present invention also relates to an image display panel and an image display device to which the polarizing film with an adhesive layer is applied.

Background

In general, a polarizing film is laminated on both sides of a liquid crystal cell, which is formed of a liquid crystal layer disposed between a pair of transparent substrates, with an adhesive layer interposed therebetween. On the other hand, when the polarizing film with the pressure-sensitive adhesive layer is attached to a liquid crystal cell in the production of an image display panel, the release film is peeled from the pressure-sensitive adhesive layer of the polarizing film with the pressure-sensitive adhesive layer, and static electricity is generated by the peeling of the release film. The static electricity generated in this way affects, for example, the alignment of the liquid crystal layer in the liquid crystal display panel, and causes a defect. The generation of static electricity can be suppressed by forming an antistatic layer (conductive layer) on the outer surface of the polarizing film, for example.

For example, in patent document 1, in order to reduce the occurrence of display failure and erroneous operation in a liquid crystal display device with a touch sensing function, it is proposed to dispose a tool on the visible side of a liquid crystal layerHaving a surface resistance value of 1.0X 10⁹～1.0×10¹¹Omega/□ antistatic layer. It is also known that generation of static electricity can be suppressed by adding an ionic compound as an antistatic agent to the pressure-sensitive adhesive layer.

On the other hand, in recent years, in smart phones and car navigation systems, there are increasing irregular in-cell liquid crystal display devices, and irregular polarizing films are used in combination with the display devices. Patent document 2 discloses a method for producing a polarizing film having a profile other than a rectangular shape by processing a polarizing film. Patent document 3 proposes to improve the irregular punching property of a polarizing film and the crack durability after a heat cycle test of the irregular polarizing film after punching by containing inorganic particles having irregular properties in a transparent protective film used for the polarizing film.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-105154

Patent document 2: japanese patent laid-open publication No. 2017-151191

Patent document 3: japanese patent laid-open publication No. 2017-097111

Disclosure of Invention

Problems to be solved by the invention

According to the polarizing film having an antistatic layer described in patent document 1, generation of static electricity can be suppressed. However, even a polarizing film with a pressure-sensitive adhesive layer provided with an antistatic layer or a pressure-sensitive adhesive layer containing an ionic compound cannot sufficiently suppress static unevenness. In addition, in the polarizing film with a pressure-sensitive adhesive layer having a special shape, the occurrence of special-shaped cracks in the special-shaped portion cannot be sufficiently suppressed even in the polarizing film with a pressure-sensitive adhesive layer provided with an antistatic layer or a pressure-sensitive adhesive layer containing an ionic compound. In particular, when a polarizing film with a pressure-sensitive adhesive layer containing an ionic compound in a pressure-sensitive adhesive layer and having an irregular portion is applied to an in-cell liquid crystal panel, it is found that a large amount of the ionic compound needs to be added to the pressure-sensitive adhesive layer, and as a result, irregular cracks generated in the irregular portion are worsened.

The present invention provides a polarizing film with an antistatic adhesive layer, which has an irregular part and is capable of suppressing the occurrence of irregular cracks and suppressing electrostatic unevenness even when applied to an in-cell liquid crystal panel.

Another object of the present invention is to provide an image display panel and an image display device to which the polarizing film with an adhesive layer is applied.

Means for solving the problems

The present inventors have made extensive studies to solve the above problems, and as a result, have found the following polarizing film with an adhesive layer, and have completed the present invention.

That is, the present invention relates to a polarizing film with an adhesive layer, comprising a polarizing film, a conductive layer and an adhesive layer in this order, wherein the polarizing film comprises a polarizer and a protective film provided on one or both surfaces of the polarizer,

the polarizing film with an adhesive layer has a deformed portion other than a rectangular shape,

the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a (meth) acrylic polymer (A) and an ionic compound (B).

In the polarizing film with an adhesive layer, the conductive layer preferably contains a conductive polymer.

In the polarizing film with an adhesive layer, the thickness of the conductive layer is preferably 1 μm or less.

In the polarizing film with an adhesive layer, the cationic component of the ionic compound (B) preferably has a molecular weight of 210 or less. Preferably, the cation component is lithium ion.

The polarizing film with an adhesive layer preferably contains 0.1 to 10 parts by weight of the ionic compound (B) per 100 parts by weight of the (meth) acrylic polymer (A),

in the polarizing film with an adhesive layer, it is preferable that the protective film is selected from a cellulose resin film and a (meth) acrylic resin film. The polarizing film preferably has a thickness of the polarizer of 10 μm or less.

In the polarizing film with an adhesive layer, a one-side protective polarizing film having a polarizer and a protective film provided only on one surface of the polarizer may be used. The one-side protective polarizing film preferably has the conductive layer on the other surface of the polarizer.

The one-side protective polarizing film may have the conductive layer on the other surface of the polarizer through a transparent layer having a thickness of 10 μm or less, the transparent layer being formed directly on the polarizer. As the transparent layer, a cured product of a material containing a urethane prepolymer which is a reaction product of an isocyanate compound and a polyol can be used.

The adhesive layer-attached polarizing film preferably has a creep value at 85 ℃ of 120 μm or less.

In addition, the present invention relates to an image display panel having the polarizing film with an adhesive layer described above. The image display panel may be applied to an image display panel in which the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer-attached polarizing film is bonded to a liquid crystal cell having a liquid crystal layer and a touch sensor unit and having a touch sensing function built therein.

In addition. The present invention relates to an image display device having the image display panel.

ADVANTAGEOUS EFFECTS OF INVENTION

The polarizing film with an adhesive layer of the present invention has a conductive layer between the adhesive layer and the polarizing film, and contains an ionic compound in the adhesive layer, so that the antistatic property can be improved by both the conductive layer and the adhesive layer. Therefore, even if the amount of the ionic compound in the pressure-sensitive adhesive layer is reduced, the antistatic function of the two layers can suppress the static unevenness when the polarizing film with the pressure-sensitive adhesive layer is applied to an in-cell type liquid crystal panel. In addition, although the polarizing film with an adhesive layer of the present invention has the irregularly shaped portions other than the rectangular shape, the amount of the ionic compound in the adhesive layer can be reduced as described above, and therefore, the occurrence of irregularly shaped cracks can be suppressed.

It is known that the smaller the molecular weight of the cationic component of the ionic compound, the less the adverse effect on the abnormal crack. In particular, it is known that when a lithium salt is used as a cationic component of an ionic compound, the effect of suppressing the abnormal cracks is excellent. It is also known that the effect of suppressing the irregular cracks is advantageous in the case of using a single-sided protective polarizing film having a protective film only on one side of a polarizer as a polarizing film. The single-sided protective polarizing film is also advantageous from the viewpoint of reduction in thickness and cost. It is known that the smaller the molecular weight of the cationic component, the more preferable the cationic component is from the viewpoint of suppressing the electrostatic unevenness.

On the other hand, it is also known that, when a single-sided protective polarizing film is used as the polarizing film as described above, the conductive layer is directly formed on the polarizer, and therefore, in a humidified environment, the antistatic agent of the conductive layer penetrates into the polarizer to discolor the end portion of the polarizer, and the ionic compound contained in the adhesive layer is segregated to the polarizer, thereby possibly lowering the antistatic function of the adhesive layer. In the case of using the one-side protective polarizing film, the conductive layer is provided on the polarizer through the transparent layer, so that the conductive layer does not directly affect the polarizer, thereby suppressing discoloration of the polarizer end portion in a humidified environment.

As described above, according to the polarizing film with an adhesive layer of the present invention, even when a one-side protective polarizing film is used, deterioration of optical reliability of a polarizer can be suppressed, and a polarizing film with an adhesive layer which is thin, has good optical reliability, and has excellent antistatic properties for a long period of time can be provided.

Drawings

Fig. 1 is a cross-sectional view showing an example of the polarizing film with an adhesive layer of the present invention.

Fig. 2 is a cross-sectional view showing an example of the polarizing film with an adhesive layer of the present invention.

Fig. 3 is a cross-sectional view showing an example of the polarizing film with an adhesive layer of the present invention.

Fig. 4 is a plan view showing an example of the irregular portion other than the rectangular portion of the polarizing film with an adhesive layer of the present invention.

Fig. 5 is a plan view showing an adhesive layer-attached polarizing film having a profile portion of an embodiment of the present invention.

Fig. 6 is a cross-sectional view showing an example of a liquid crystal panel with a touch sensor function using the polarizing film with an adhesive layer of the present invention.

Fig. 7 is a cross-sectional view showing an example of a liquid crystal panel with a touch sensor function using the polarizing film with an adhesive layer of the present invention.

Fig. 8 is a cross-sectional view showing an example of a liquid crystal panel with a touch sensor function using the polarizing film with an adhesive layer of the present invention.

Description of the symbols

Polarizing film with adhesive layer

11 Single-sided protective polarizing film

a polarizer

b protective film

c conductive layer

d transparent layer

21 adhesive layer

2 gap part (Special-shaped part)

Length of W1 notch

Maximum depth of notch part from W1

Angle formed by two straight lines of theta 1

Radius of curvature of R1 curve

11. 12 first and second polarizing films

21. 22 first and second adhesive layers

3 liquid crystal layer

41. 42 first and second transparent substrates

5 touch sensor unit

6 Driving electrode and sensor part

7 drive electrode

C liquid crystal unit

Detailed Description

The polarizing film with an adhesive layer of the present invention is shown in fig. 1, for example. As shown in fig. 1, the polarizing film with an adhesive layer 1 includes a polarizing film 11, a conductive layer c, and an adhesive layer 21 in this order. Fig. 2 shows a case where the polarizing film 11 of fig. 1 is used as the one-side protective polarizing film 11A having the protective film b only on one surface of the polarizer a, and the one-side protective polarizing film 11A has the pressure-sensitive adhesive layer 21 on the other surface of the polarizer a on the side not having the protective film b with the conductive layer c interposed therebetween. Although not shown, a laminate having the polarizer a, the protective film b, the conductive layer c, and the pressure-sensitive adhesive layer 21 in this order may be used as the one-side protective polarizing film a2 having the protective film b only on one surface of the polarizer a. Fig. 3 shows a case where the one-side protective polarizing film 11A is used and a transparent layer d is further provided on the other surface of the polarizer a. In fig. 3, a transparent layer d, a conductive layer c, and an adhesive layer 21 are provided in this order on the one-side protective polarizing film 11A. The transparent layer d is preferably provided directly on the polarizer a, from the viewpoint of suppressing an increase in the moisture content of the polarizer in a high-temperature and high-humidity environment.

< Special-shaped part >

The polarizing film with an adhesive layer of the present invention has an irregular portion other than a rectangular portion. Fig. 4 is a plan view of an example of the polarizing film with an adhesive layer having an irregular portion other than a rectangular portion. The irregular shape is not particularly limited, and may be any shape according to the use, function, design, and the like of the polarizing film with an adhesive layer. Examples of the irregular shape other than the rectangular shape include a case where the rectangular shape has a notch or a through hole.

The notch is provided on the outer edge of the polarizing film with the pressure-sensitive adhesive layer. When a plurality of the above-described notch portions are provided, they may be of the same shape or different shapes. The notch portion may be provided in two or more on one side, or may be provided in two or more on two sides, respectively. The notch may be provided at one of the corners of the 4 outer edges of the rectangle, or at two or more of them. The corner of the outer edge where the notch is not provided may be square or circular. The notch may be formed by a straight line, a curved line, or a combination thereof. Fig. 4 shows an example of a polarizing film 1 having an irregularly shaped pressure-sensitive adhesive layer, in which notches 2 having different shapes are provided on both short sides of a rectangle.

The length of the side W1 of the notch is appropriately adjusted according to the application of the polarizing film. For example, W1 is preferably adjusted within a range of about 2 to 100 mm. Further, the maximum depth D of the notch 2 from the side W1 is preferably adjusted within a range of about 2 to 100 mm.

Fig. 4 shows a case where the angle θ 1 formed by two straight lines constituting the shape of the cutout portion 2 is 90 °, and the angle θ 1 is 90 ° or more and less than 180 °, preferably 90 ° or more and 135 ° or less. In the case where the angle θ 1 is outside the above range, in a severe environment of thermal shock, stress due to expansion/contraction concentrates on the portion 4 where two straight lines intersect, and cracks are easily generated in the portion 4.

Fig. 4 shows a curve that forms the shape of the notch portion 2, and the curvature radius R1 of the curve is 0.2mm or more, preferably 1mm or more, more preferably 2mm or more, further preferably 3mm or more, and still further preferably 5mm or more. In the case where the curvature radius R1 is less than 0.2mm, in a severe environment of thermal shock, stress based on expansion/contraction concentrates on a curved portion, and cracks are easily generated at the curved portion.

The through-hole is provided in the plane of the polarizing film with the adhesive layer. When a plurality of through-holes are provided in the plane of the polarizing film with an adhesive layer, they may have the same shape or different shapes. The through-hole is formed by a straight line, a curved line, or a combination thereof. Examples of the shape of the through-hole include: a circle, an ellipse (a shape having one axis of symmetry and a shape having two axes of symmetry), a rounded rectangle, a quadrangle (a square or a rectangle), a polygon having five or more sides, and the like.

Examples of the method for forming the irregularly shaped portion include: blanking, vertical milling, laser processing, and the like. The irregular part is generally formed by the above-described processing after the layers are laminated.

< polarizing film with adhesive layer >

First, each member constituting the polarizing film with an adhesive layer of the present invention will be described. The polarizing film includes a polarizer and a protective film provided on one or both surfaces of the polarizer.

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

Further, as the polarizer, a thin polarizer having a thickness of 10 μm or less can be used. From the viewpoint of thinning, the thickness is preferably 1 to 7 μm. Such a thin polarizer is preferable in that it has less unevenness in thickness, excellent visibility, and less dimensional change, and therefore has excellent durability, and can be made thin even when used as a polarizing film.

As a material constituting the protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, and the like can be used. Specific examples of such thermoplastic resins include: cellulose resins such as cellulose triacetate, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic polyolefin resins (for example, norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. In general, a protective film is bonded to one side of the polarizer via an adhesive layer, and a thermosetting resin or an ultraviolet-curable resin such as a (meth) acrylic resin, a urethane resin, an acrylic urethane resin, an epoxy resin, or a silicone resin is used as the protective film on the other side.

As materials of the protective film (transparent protective film), cellulose resin and (meth) acrylic resin are preferable because fluctuation of the surface resistance value of the pressure-sensitive adhesive layer can be controlled to be small. As the (meth) acrylic resin, a (meth) acrylic resin having a lactam ring structure is preferably used. The (meth) acrylic resin having a lactam ring structure may be, for example, the (meth) acrylic resin having a lactam ring structure described in Japanese patent application laid-open Nos. 2000-230016, 2001-151814, 2002-120326, 2002-254544, 2005-146084, and the like. In particular, cellulose resins are preferable to (meth) acrylic resins in terms of effectively suppressing irregular cracks and polarizer cracks, which are problematic in single-sided protective polarizing films.

As the protective film, a retardation film, a brightness enhancement film, a diffusion film, or the like may be used. Examples of the retardation film include a retardation film having a front retardation of 40nm or more and/or a thickness direction retardation of 80nm or more. The front phase difference is usually controlled within a range of 40 to 200nm, and the thickness direction phase difference is usually controlled within a range of 80 to 300 nm. When the retardation film is used as the protective film, the retardation film also functions as a polarizer protective film, and therefore, the thickness can be reduced.

A functional layer such as a hard coat layer, an antireflection layer, an adhesion prevention layer, a diffusion layer, and an antiglare layer may be provided on the side of the protective film to which the polarizer is not bonded.

The protective film and the polarizer may be laminated with an interlayer such as an adhesive layer, and an undercoat layer (primer layer) interposed therebetween. In this case, it is preferable to stack both layers without an air gap by using an interlayer. The protective film and the polarizer are preferably laminated with an adhesive layer interposed therebetween. The adhesive used for bonding the polarizer and the protective film is not particularly limited as long as it is optically transparent, and various types of adhesives such as water-based, solvent-based, hot-melt, radical-curable, and cation-curable adhesives can be used, and a water-based adhesive or a radical-curable adhesive is preferred.

< conductive layer >

From the viewpoint of stability of surface resistance value and adhesion to the adhesive layer 21, the thickness of the conductive layer c is preferably 1 μm or less, more preferably 0.01 to 0.5 μm, even more preferably 0.01 to 0.2 μm, and even more preferably 0.01 to 0.1 μm. In addition, from the viewpoint of antistatic function, the surface resistance value of the conductive layer c is preferably 1 × 10⁷～1×10¹²Omega/□, more preferably 1X 10⁷～1×10¹¹Omega/□, more preferably 1X 10⁷～1×10¹⁰Ω/□。

The conductive layer may be formed of various antistatic agent compositions. As the antistatic agent for forming the conductive layer, ionic surfactants, conductive polymers, conductive fine particles, carbon nanotubes, and the like can be used.

Among these antistatic agents, conductive polymers and carbon nanotubes are preferably used from the viewpoint of optical properties, appearance, antistatic effect, and stability of antistatic effect in hot and humid conditions. In particular, a conductive polymer such as polyaniline or polythiophene is preferably used. As the conductive polymer, an organic solvent-soluble, water-soluble or water-dispersible polymer can be suitably used, and a water-soluble conductive polymer or a water-dispersible conductive polymer is preferably used. This is because the water-soluble conductive polymer or the water-dispersible conductive polymer can be used as an aqueous solution or an aqueous dispersion to prepare a coating solution for forming an antistatic layer, and the coating solution does not require the use of a nonaqueous organic solvent and can suppress the denaturation of the optical film substrate by the organic solvent. The aqueous solution or aqueous dispersion may contain an aqueous solvent other than water. Examples thereof include: alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-pentanol, isopentanol, sec-pentanol, tert-pentanol, 1-ethyl-1-propanol, 2-methyl-1-butanol, n-hexanol, and cyclohexanol.

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: sulfonic acid groups, amino groups, amide groups, imino groups, quaternary ammonium salt groups, hydroxyl groups, mercapto groups, hydrazine groups, carboxyl groups, sulfate groups, phosphate groups, or salts thereof. The water-soluble conductive polymer or water-dispersible conductive polymer can be easily produced by having a hydrophilic functional group in the molecule, and thereby easily dissolving in water and dispersing in water in the form of fine particles.

Examples of commercially available products of water-soluble conductive polymers include polyaniline sulfonic acid (weight average molecular weight of 150000 in terms of polystyrene, manufactured by mitsubishi positive corporation) and the like. Examples of commercially available products of water dispersible conductive polymers include polythiophene-based conductive polymers (trade name Denatron series, manufactured by Nagase ChemteX corporation), and the like.

In addition, as a material for forming the conductive layer, a binder component may be added together with the antistatic agent in order to improve film-forming properties of the antistatic agent, adhesion to the optical film, and the like. In the case where 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 binders include: comprises

Oxazoline-based polymers, polyurethane-based resins, polyester-based resins, acrylic-based resins, polyether-based resins, cellulose-based resins, polyvinyl alcohol-based resins, epoxy resins, polyvinyl pyrrolidone, polystyrene-based resins, polyethylene glycol, pentaerythritol, and the like. Particularly preferred are polyurethane resins, polyester resins and acrylic resins. These binders may be used in a combination of 1 or 2 or more, depending on the use.

The amount of the antistatic agent and the binder to be used varies depending on the kind thereofHowever, it is preferable to control the amount so that the surface resistance of the resulting conductive layer becomes 1X 10⁷～1×10¹²Ω/□。

< adhesive layer >

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

Examples of the alkyl (meth) acrylate constituting the main skeleton of the (meth) acrylic polymer (A) include linear or branched alkyl (meth) acrylates having an alkyl group of 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, a pentyl group, a hexyl group, a cyclohexyl group, a heptyl group, a 2-ethylhexyl group, an isooctyl group, a nonyl group, a decyl group, an isodecyl group, a dodecyl group, an isomyristyl group, a lauryl group, a tridecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group. They may be used alone or in combination. The average number of carbon atoms of these alkyl groups is preferably 3 to 9.

The weight ratio of the alkyl (meth) acrylate is preferably 70% by weight or more of the total constituent monomers (100% by weight) constituting the (meth) acrylic polymer (a) in terms of monomer units. The above-mentioned weight ratio of the alkyl (meth) acrylate may be regarded as the remainder of the other comonomers. It is preferable to set the weight ratio of the alkyl (meth) acrylate to the above range in order to secure adhesiveness.

For the purpose of improving adhesiveness and heat resistance, in the (meth) acrylic polymer (a), in addition to the monomer unit of the alkyl (meth) acrylate, 1 or more kinds of comonomers having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group may be introduced by copolymerization.

As the above-mentioned comonomer, for example: a carboxyl group-containing monomer, a hydroxyl group-containing monomer, an amide group-containing monomer, and the like.

The carboxyl group-containing monomer is a compound having a carbonyl group in its structure and containing 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 above carboxyl group-containing monomers, acrylic acid is preferred from the viewpoint of copolymerizability, price and adhesive properties.

The hydroxyl group-containing monomer is a compound having a hydroxyl group in its structure and containing a polymerizable unsaturated double bond such as a (meth) acryloyl group or a vinyl group. Specific examples of the hydroxyl group-containing monomer include: hydroxyalkyl (meth) acrylates such as 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, and (4-hydroxymethylcyclohexyl) methyl acrylate. Among the above 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 binder composition contains a crosslinking agent, the carboxyl group-containing monomer and the hydroxyl group-containing monomer serve as reaction sites with the crosslinking agent. Since the carboxyl group-containing monomer, the hydroxyl group-containing monomer, and the intermolecular crosslinking agent have high reactivity, they are preferably used for improving the cohesive property and heat resistance of the pressure-sensitive adhesive layer to be obtained. The carboxyl group-containing monomer is preferable in terms of both durability and reworkability, and the hydroxyl group-containing monomer is preferable in terms of reworkability.

The weight ratio of the carboxyl group-containing monomer is preferably 10% by weight or less, more preferably 0.01 to 8% by weight, even more preferably 0.05 to 6% by weight, and even more preferably 0.1 to 5% by weight. It is preferable to set the weight ratio of the carboxyl group-containing monomer to 0.01 wt% or more in terms of durability. On the other hand, when the amount is more than 10% by weight, it is not preferable from the viewpoint of the 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, even more preferably 0.1 to 2% by weight, and even more preferably 0.2 to 2% by weight. From the viewpoint of crosslinking the pressure-sensitive adhesive layer, durability, and adhesive properties, the weight ratio of the hydroxyl group-containing monomer is preferably 0.01 wt% or more. On the other hand, if the amount is more than 3% by weight, the amount is not preferable in view of durability.

The amide group-containing monomer is a compound having an amide group in its structure and containing a polymerizable unsaturated double bond such as a (meth) acryloyl group or a vinyl group. Specific examples of the amide group-containing monomer include: acrylamide monomers such as (meth) acrylamide, N-dimethyl (meth) acrylamide, N-diethyl (meth) acrylamide, N-isopropylacrylamide, N-methyl (meth) acrylamide, N-butyl (meth) acrylamide, N-hexyl (meth) acrylamide, N-methylol-N-propyl (meth) acrylamide, aminomethyl (meth) acrylamide, aminoethyl (meth) acrylamide, mercaptomethyl (meth) acrylamide, and mercaptoethyl (meth) acrylamide; n-acryloyl heterocyclic monomers such as N- (meth) acryloyl morpholine, N- (meth) acryloyl piperidine, and N- (meth) acryloyl pyrrolidine; and N-vinyl lactam-containing monomers such as N-vinylpyrrolidone and N-vinyl-epsilon-caprolactam. The amide group-containing monomer is preferable in terms of suppressing an increase in surface resistance value with time (particularly in a humidified environment) and satisfying durability, and is further preferable in terms of suppressing irregular cracks. In particular, among the amide group-containing monomers, N-vinyl lactam group-containing monomers are preferable in that the increase in surface resistance value is suppressed with time (particularly in a humidified environment), the durability to the transparent conductive layer (touch sensor layer) is satisfied, and the occurrence of irregular cracks is suppressed.

Since the anchoring property to the optical film tends to be lowered when the weight ratio of the amide group-containing monomer is increased, the weight ratio is preferably 10% by weight or less, and particularly preferably 5% by weight or less. From the viewpoint of suppressing an increase in the surface resistance value with time (particularly in a humidified environment), the weight ratio of the amide group-containing monomer is preferably 0.1% by weight or more, and the weight ratio is preferably 0.3% by weight or more, and more preferably 0.5% by weight or more. The amide group-containing monomer is preferable in view of the relationship with the ionic compound (B) contained in the pressure-sensitive adhesive layer of the present invention.

When the amide group introduced into the side chain of the (meth) acrylic polymer (a) as the base polymer is present in the pressure-sensitive adhesive composition used for forming the pressure-sensitive adhesive layer, the presence of the amide group suppresses the variation and increase in the surface resistance value of the pressure-sensitive adhesive layer adjusted by the incorporation of the ionic compound (B) even in a humidified environment, and is preferably maintained within a desired value range. It is considered that the compatibility between the (meth) acrylic polymer (a) and the ionic compound (B) is improved by the presence of an amide group introduced as a functional group of the comonomer into the side chain of the (meth) acrylic polymer (a).

In addition, when the amide group introduced into the side chain of the (meth) acrylic polymer (a) as the base polymer is present in the pressure-sensitive adhesive layer, the durability to both glass and a transparent conductive layer (ITO layer and the like) is good, and peeling, lifting and the like in a state of being attached to a liquid crystal panel can be suppressed. In addition, durability can be satisfied even in a humidified environment (after a humidification reliability test).

In addition, as comonomers, for example: an aromatic ring-containing (meth) acrylate. The aromatic ring-containing (meth) acrylate is a compound having 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: (meth) acrylates having a benzene ring such as benzyl (meth) acrylate, phenyl (meth) acrylate, o-phenylphenol (meth) acrylate, phenoxymethyl (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, methylphenyl (meth) acrylate, and styryl (meth) acrylate; (meth) acrylates having a naphthalene ring such as hydroxyethylated β -naphthol acrylate, 2-naphthylethyl (meth) acrylate, 2-naphthyloxyethyl acrylate, and 2- (4-methoxy-1-naphthyloxy) ethyl (meth) acrylate; aromatic ring-containing (meth) acrylates having a biphenyl ring such as biphenyl (meth) acrylate.

The aromatic ring-containing (meth) acrylate is preferably benzyl (meth) acrylate or phenoxyethyl (meth) acrylate, and particularly preferably phenoxyethyl (meth) acrylate, from the viewpoint of adhesion characteristics 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, even more preferably 10 to 22% by weight, and even more preferably 14 to 20% by weight. When the weight ratio of the aromatic ring-containing (meth) acrylate is 3% by weight or more, it is preferable to suppress display unevenness. On the other hand, if the amount is more than 25% by weight, the suppression of the display unevenness is rather insufficient, and the durability tends to be lowered.

Specific examples of the other comonomers other than the above include acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; sulfonic acid group-containing monomers such as allylsulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid, (meth) acrylamidopropanesulfonic acid, and sulfopropyl (meth) acrylate; phosphoric acid group-containing monomers such as 2-hydroxyethylacryloyl phosphate, and the like.

Further, as examples of the monomer for the purpose of modification, there may be mentioned: alkylaminoalkyl (meth) acrylates such as aminoethyl (meth) acrylate, N-dimethylaminoethyl (meth) acrylate, and t-butylaminoethyl (meth) acrylate; alkoxyalkyl (meth) acrylates such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate; succinimide monomers such as N- (meth) acryloyloxymethylene succinimide, N- (meth) acryloyl-6-oxyhexamethylene succinimide, and N- (meth) acryloyl-8-oxyoctamethylene succinimide; maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-dodecylmaleimide and N-phenylmaleimide; and itaconimide monomers such as N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N-octylitaconimide, N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, and N-dodecylitaconimide.

As the modifying monomer, a vinyl monomer such as vinyl acetate or vinyl propionate; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing (meth) acrylates such as glycidyl (meth) acrylate; glycol (meth) acrylates such as polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, methoxy ethylene glycol (meth) acrylate, and methoxy polypropylene glycol (meth) acrylate; acrylic ester monomers such as tetrahydrofurfuryl (meth) acrylate, fluorine-containing (meth) acrylate, silicone (meth) acrylate, and 2-methoxyethyl acrylate. Further, isoprene, butadiene, isobutylene, vinyl ether and the like are exemplified.

Examples of the copolymerizable monomer other than those described above include silane-based monomers containing a silicon atom. Examples of the silane monomer include: 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloxydecyltrimethoxysilane, 10-acryloxydecyltrimethoxysilane, 10-methacryloxydecyltriethoxysilane, 10-acryloxydecyltriethoxysilane, and the like.

In addition, as comonomers, it is also possible to use: a polyfunctional monomer having 2 or more unsaturated double bonds such as (meth) acryloyl groups and vinyl groups, such as an esterified product of (meth) acrylic acid and a polyhydric alcohol, for example, tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1, 6-hexanediol di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and caprolactone-modified dipentaerythritol hexa (meth) acrylate, a polyester (meth) acrylate obtained by adding 2 or more unsaturated double bonds such as (meth) acryloyl groups and vinyl groups to a polyester, epoxy, urethane, or other skeleton as functional groups similar to those of the monomer components, Epoxy (meth) acrylates, urethane (meth) acrylates, and the like.

The proportion of the other comonomer in the (meth) acrylic polymer (a) is preferably about 0 to 10% by weight, more preferably about 0 to 7% by weight, and further preferably about 0 to 5% by weight, based on the weight ratio of all constituent monomers (100% by weight) of the (meth) acrylic polymer (a).

The weight average molecular weight of the (meth) acrylic polymer (a) of the present invention is preferably from 100 to 250 ten thousand. In consideration of durability, particularly heat resistance, the weight average molecular weight is preferably 120 to 200 ten thousand. When the weight average molecular weight is 100 ten thousand or more, it is preferable in terms of heat resistance. When the weight average molecular weight is more than 250 ten thousand, the adhesive tends to be easily hardened and easily peeled off. The weight average molecular weight (Mw)/number average molecular weight (Mn) representing the molecular weight distribution is preferably 1.8 or more and 10 or less, more preferably 1.8 to 7, and still more preferably 1.8 to 5. When the molecular weight distribution (Mw/Mn) is more than 10, it is not preferable in view of durability. The weight average molecular weight and the molecular weight distribution (Mw/Mn) were determined from values measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene.

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

In the solution polymerization, for example, ethyl acetate, toluene, or the like is used as a polymerization solvent. As a specific example of the solution polymerization, the reaction is carried out under a stream of an inert gas such as nitrogen, and a polymerization initiator is added thereto, usually under reaction conditions of about 50 to 70 ℃ and 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 may be appropriately selected and used. The weight average molecular weight of the (meth) acrylic polymer (a) can be controlled by the amount of the polymerization initiator, the chain transfer agent and the reaction conditions, and the amount thereof can be appropriately adjusted depending on the kind thereof.

< Ionic Compound (B) >)

As the ionic compound (B) contained in the adhesive composition forming the adhesive layer of the present invention, an alkali metal salt and/or an organic cation-anion salt can be preferably used. The alkali metal salt may be an organic salt or an inorganic salt of an alkali metal. The "organic cation-anion salt" as used herein means an organic salt in which the cation component is composed of an organic substance, and the anion component may be either an organic substance or an inorganic substance. The "organic cation-anion salt" is also referred to as an ionic liquid or an ionic solid. By containing the ionic compound (B) in the pressure-sensitive adhesive layer, the surface resistance of the pressure-sensitive adhesive layer can be reduced to suppress generation of static electricity, and occurrence of light leakage (charge unevenness) due to disturbance of alignment of the liquid crystal layer caused by charging can be suppressed.

< alkali metal salt >

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

The anion component of the alkali metal salt may be composed of an organic substance or an inorganic substance. As the anion component constituting the organic salt, for example: CH (CH)₃COO^-、CF₃COO^-、CH₃SO₃ ^-、CF₃SO₃ ^-、(CF₃SO₂)₃C^-、C₄F₉SO₃ ^-、C₃F₇COO^-、(CF₃SO₂)(CF₃CO)N^-、^-O₃S(CF₂)₃SO₃ ^-、PF₆ ^-、CO₃ ^2-And anions represented by the following general formulae (1) to (4).

(1)：(C_nF_2n+1SO₂)₂N^-(wherein n is an integer of 0 to 10),

(2)：CF₂(C_mF_2mSO₂)₂N^-(wherein m is an integer of 1 to 10),

(3)：^-O₃S(CF₂)_lSO₃ ^-(wherein l is an integer of 1 to 10),

(4)：(C_pF_2p+1SO₂)N^-(C_qF_2q+1SO₂) (wherein p and q are integers of 1 to 10).

In particular, an anionic component containing a fluorine atom is preferably used because an ionic compound having good ion dissociation property can be obtained. As the anion component constituting the inorganic salt, Cl may be used^-、Br^-、I^-、AlCl₄ ^-、Al₂Cl₇ ^-、BF₄ ^-、PF₆ ^-、ClO₄ ^-、NO₃ ^-、AsF₆ ^-、SbF₆ ^-、NbF₆ ^-、TaF₆ ^-、(CN)₂N^-And the like. As the anionic component, (CF) is preferred₃SO₂)₂N^-、(C₂F₅SO₂)₂N^-(perfluoroalkylsulfonyl) imide represented by the above general formula (1), and (CF) is particularly preferable₃SO₂)₂N^-(trifluoromethanesulfonyl) imide shown.

Specific examples of the organic salt of an alkali metal include: sodium acetate, sodium alginate, sodium lignosulfonate, sodium toluenesulfonate, LiCF₃SO₃、Li(CF₃SO₂)₂N、Li(CF₃SO₂)₂N、Li(C₂F₅SO₂)₂N、Li(C₄F₉SO₂)₂N、Li(CF₃SO₂)₃C、KO₃S(CF₂)₃SO₃K、LiO₃S(CF₂)₃SO₃K, etc., among these, LiCF is preferred₃SO₃、Li(CF₃SO₂)₂N、Li(C₂F₅SO₂)₂N、Li(C₄F₉SO₂)₂N、Li(CF₃SO₂)₃C, etc., more preferably Li (CF)₃SO₂)₂N、Li(C₂F₅SO₂)₂N、Li(C₄F₉SO₂)₂A fluorine-containing imide lithium salt such as a bis (fluorosulfonyl) imide lithium salt, for example, N, and a (perfluoroalkylsulfonyl) imide lithium salt is particularly preferable. Further, lithium salt of 4,4,5, 5-tetrafluoro-1, 3, 2-dithiazolidine-1, 1,3, 3-tetraoxide and the like are exemplified.

Examples of the inorganic salt of an 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 composed of an organic substance. Specific examples of the cationic component include: pyridine compound

Cation, piperidine

Cation, pyrrolidine

Cation, cation having pyrroline skeleton, imidazole

Cationic, tetrahydropyrimidines

Cationic dihydropyrimidines

Cationic, pyrazoles

Cationic pyrazolines

Cation, tetraalkylammonium cation, trialkylsulfonium cation, tetraalkyl

Cations, and the like.

As the anionic component, for example: cl^-、Br^-、I^-、AlCl₄ ^-、Al₂Cl₇ ^-、BF₄ ^-、PF₆ ^-、ClO₄ ^-、NO₃ ^-、CH₃COO^-、CF₃COO^-、CH₃SO₃ ^-、CF₃SO₃ ^-、(CF₃SO₂)₃C^-、AsF₆ ^-、SbF₆ ^-、NbF₆ ^-、TaF₆ ^-、(CN)₂N^-、C₄F₉SO₃ ^-、C₃F₇COO^-、(CF₃SO₂)(CF₃CO)N^-、^-O₃S(CF₂)₃SO₃ ^-And anions represented by the following general formulae (1) to (4).

(1)：(C_nF_2n+1SO₂)₂N^-(wherein n is an integer of 0 to 10),

(2)：CF₂(C_mF_2mSO₂)₂N^-(wherein m is an integer of 1 to 10),

(3)：^-O₃S(CF₂)_lSO₃ ^-(wherein l is an integer of 1 to 10),

Among these, an anionic component containing a fluorine atom is preferably used because an ionic compound having good ion dissociation property can be obtained.

The organic cation-anion salt is suitably selected from compounds composed of a combination of the above-mentioned cation component and anion component. Preferred examples of the organic cation-anion salt include: methyltrioctylammonium bis (trifluoromethanesulfonyl) imide, 1-methyl-1-propylpyrrolidine

Bis (trifluoromethanesulfonyl) imide and ethylmethylimidazole

Bis (fluorosulfonyl imide). Among them, 1-methyl-1-propylpyrrolidine is more preferable

Bis (trifluoromethanesulfonyl) imide and ethylmethylimidazole

Bis (fluorosulfonyl imide).

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

From the viewpoint of suppressing the occurrence of abnormal cracks, it is preferable to use an ionic compound having a molecular weight of 210 or less as a cationic component for the ionic compound (B). The molecular weight of the cationic component is more preferably 150 or less, still more preferably 110 or less, still more preferably 50 or less, and still more preferably 10 or less. As the molecular weight of the cationic component is increased, entanglement of (meth) acrylic polymers in the pressure-sensitive adhesive layer is inhibited, and the physical properties of the pressure-sensitive adhesive layer tend to be soft. Therefore, the smaller the molecular weight, the more flexible the physical properties of the pressure-sensitive adhesive layer, and the more the occurrence of abnormal cracks can be suppressed. The smaller the molecular weight of the cationic component, the more likely the surface resistance value of the pressure-sensitive adhesive layer is to be reduced, and this is also preferable from the viewpoint of suppressing the electrostatic unevenness.

When the ionic compound (B) is an alkali metal salt, alkali metal ions such as lithium, sodium, and potassium are cationic components having a molecular weight of 210 or less, and therefore alkali metal salts having these alkali metal ions as cationic components can be suitably used. In particular, from the viewpoint of compatibility with the pressure-sensitive adhesive layer, an organic salt of an alkali metal in which the anion component of the alkali metal salt is composed of an organic substance is preferable. In addition, the alkali metal ion is preferably a lithium ion having the smallest molecular weight. The ionic compound (B) is preferably a lithium salt, and particularly preferably an organic salt of lithium. On the other hand, in the case where the ionic compound (B) is an organic cation-anion salt, an organic cation-anion salt having a molecular weight of 210 or less can be selectively used from the cation components exemplified above. From the viewpoint of compatibility with the adhesive layer, an organic cation-anion salt in which the anion component is composed of an organic substance is particularly preferable.

The proportion of the ionic compound (B) in the adhesive composition of the present invention can be appropriately adjusted so as to satisfy the antistatic property of the adhesive layer and the sensitivity of the touch panel. For example, it is preferable to adjust the proportion of the ionic compound (B) so that the surface of the pressure-sensitive adhesive layer is electrically charged in consideration of the kind of the protective film of the polarizing film and the like, depending on the kind of the liquid crystal panel incorporating the touch sensing functionResistance value of 1.0 x 10⁸～1.0×10¹²Range of omega/□. For example, in the liquid crystal panel with built-in touch sensor function of the built-in type shown in fig. 6, it is preferable to control the initial surface resistance value of the pressure-sensitive adhesive layer to 1 × 10⁸～1×10¹²The range of omega/□ is more preferably controlled to be 1X 10⁸～1×10¹⁰Range of omega/□. In the liquid crystal panel with built-in touch sensing function of the semi-embedded type shown in fig. 7 or the external embedded type shown in fig. 8, the initial surface resistance value of the pressure-sensitive adhesive layer is preferably controlled to 1 × 10¹⁰～1×10¹²Range of omega/□.

When the amount of the ionic compound (B) is increased, the ionic compound (B) may be precipitated, and the wet peeling is likely to occur. When the amount of the ionic compound (B) is increased, the surface resistance value becomes too low, and the sensitivity of the touch panel may be lowered due to a baseline variation (malfunction at the time of touch caused by too low surface resistance value). The proportion of the ionic compound (B) is, for example, usually preferably 40 parts by weight or less, more preferably 20 parts by weight or less, still more preferably 10 parts by weight or less, and still more preferably 6 parts by weight or less, relative to 100 parts by weight of the (meth) acrylic polymer (a). If the amount is too small, the antistatic property is poor, and if the amount is too large, the touch sensitivity may be lowered, an ionic compound may be precipitated, and the adhesive may be peeled off with moisture. On the other hand, from the viewpoint of improving antistatic properties, it is preferable to use 0.01 part by weight or more of the ionic compound (B). From this viewpoint, the ionic compound (B) is preferably 0.1 part by weight or more, more preferably 0.5 part by weight or more.

The adhesive composition of the present invention may contain a crosslinking agent (C). As the crosslinking agent (C), an organic crosslinking agent or a polyfunctional metal chelate compound 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 compound is a chelate compound obtained by covalently bonding or coordinately bonding a polyvalent metal to an organic compound. Examples of the polyvalent metal atom include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn and Ti. Examples of the atom in the covalently or coordinately bonded organic compound 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-based crosslinking agent and/or a peroxide-based crosslinking agent.

As the isocyanate-based crosslinking agent (C), a compound having at least 2 isocyanate groups can be used. For example, known aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates, and the like, which are generally used in the urethanization reaction, can be used.

The peroxide may be suitably used as long as it is a peroxide which generates radical active species by heating or light irradiation and crosslinks the base polymer of the pressure-sensitive adhesive composition, but in view of handling and stability, a peroxide having a 1-minute half-life temperature of 80 to 160 ℃ is preferably used, and a peroxide having a 1-minute half-life temperature of 90 to 140 ℃ is more preferably used.

Examples of peroxides that can be used include: di (2-ethylhexyl) peroxydicarbonate (1-minute half-life temperature: 90.6 ℃ C.), di (4-tert-butylcyclohexyl) peroxydicarbonate (1-minute half-life temperature: 92.1 ℃ C.), di-sec-butyl peroxydicarbonate (1-minute half-life temperature: 92.4 ℃ C.), tert-butyl peroxyneodecanoate (1-minute half-life temperature: 103.5 ℃ C.), tert-hexyl peroxypivalate (1-minute half-life temperature: 109.1 ℃ C.), tert-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.), 1,3, 3-tetramethylbutyl peroxy2-ethylhexanoate (1-minute half-life temperature: 124.3 ℃ C.), di (4-methylbenzoyl) peroxide (1-minute half-life temperature: 128.2 ℃ C.), and, Dibenzoyl peroxide (1 minute half-life temperature: 130.0 ℃ C.), tert-butyl peroxyisobutyrate (1 minute half-life temperature: 136.1 ℃ C.), 1-bis (tert-hexyl peroxide) cyclohexane (1 minute half-life temperature: 149.2 ℃ C.). Among them, bis (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 can be preferably used because of its particularly excellent crosslinking reaction efficiency.

The amount of the crosslinking agent (C) is preferably 3 parts by weight or less, more preferably 0.01 to 3 parts by weight, still more preferably 0.02 to 2 parts by weight, and still more preferably 0.03 to 1 part by weight, based on 100 parts by weight of the (meth) acrylic polymer (A). When the amount of the crosslinking agent (C) is less than 0.01 parts by weight, the crosslinking of the pressure-sensitive adhesive layer may be insufficient, and the durability and the adhesive properties may not be satisfied, whereas when the amount is more than 3 parts by weight, the pressure-sensitive adhesive layer tends to be too hard and the durability tends to be lowered.

The adhesive composition of the present invention may contain a silane coupling agent (D). By using the silane coupling agent (D), durability can be improved. Specific examples of the silane coupling agent include: an epoxy-containing silane coupling agent such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane and 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, an amino-containing silane coupling agent such as 3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N- (1, 3-dimethylbutylidene) propylamine and N-phenyl-gamma-aminopropyltrimethoxysilane, a (meth) acryloyl silane coupling agent such as 3-acryloxypropyltrimethoxysilane or 3-methacryloxypropyltriethoxysilane, a (meth) acryloyl silane coupling agent such as a silane coupling agent, a silane coupling agent, a silane coupling agent, a silane coupling agent, a silane, a polymer, a silane, a polymer, a, Isocyanate-containing silane coupling agents such as 3-isocyanatopropyltriethoxysilane, and the like. As the silane coupling exemplified above, an epoxy group-containing silane coupling agent is preferable.

Further, as the silane coupling agent (D), a silane coupling agent having a plurality of alkoxysilyl groups in the molecule may be used. Specific examples thereof include: x-41-1053, X-41-1059, 1059A, X-41-1056, X-41-1805, X-41-1818, X-41-1810, and X-40-2651 manufactured by shin-Etsu chemical Co. These silane coupling agents having a plurality of alkoxysilyl groups in the molecule are less volatile, and are preferable because they have a plurality of alkoxysilyl groups and are effective for improving durability. In particular, when the adherend of the optical film with an adhesive layer is a transparent conductive layer (for example, ITO or the like) in which alkoxysilyl groups are less reactive than glass, the durability is also suitable. The silane coupling agent having a plurality of alkoxysilyl groups in the molecule is preferably one having an epoxy group in the molecule, and more preferably one having a plurality of epoxy groups in the molecule. Even when the adherend is a transparent conductive layer (for example, ITO), the silane coupling agent having a plurality of alkoxysilyl groups in the molecule and an epoxy group tends to have good durability. Specific examples of the silane coupling agent having a plurality of alkoxysilyl groups in the molecule and an epoxy group include X-41-1053 and X-41-1059A, X-41-1056 manufactured by shin-Etsu chemical Co., Ltd, and X-41-1056 manufactured by shin-Etsu chemical Co., Ltd having a large epoxy group content is particularly preferable.

The silane coupling agent (D) may be used alone or in combination of two or more, and the total content thereof is preferably 5 parts by weight or less, more preferably 0.001 to 5 parts by weight, even more preferably 0.01 to 1 part by weight, even more preferably 0.02 to 1 part by weight, and even more preferably 0.05 to 0.6 part by weight, per 100 parts by weight of the (meth) acrylic polymer (a), and is an amount that improves durability.

The pressure-sensitive adhesive composition of the present invention may contain other known additives, and for example, a polyether compound having a reactive silyl group, a polyether compound such as a polyalkylene glycol such as polypropylene glycol, a colorant, a powder such as a pigment, a dye, a surfactant, a plasticizer, a thickener, a surface lubricant, a leveling agent, a softener, an antioxidant, a light stabilizer, an ultraviolet absorber, a polymerization inhibitor, an inorganic or organic filler, a metal powder, a pellet, a foil, and the like may be added as appropriate depending on the application. Further, redox species to which a reducing agent is added may be used within a controllable range. These additives are used preferably in a range of 5 parts by weight or less, more preferably 3 parts by weight or less, and still more preferably 1 part by weight or less, based on 100 parts by weight of the (meth) acrylic polymer (a).

The pressure-sensitive adhesive layer can be formed, for example, by a method in which the pressure-sensitive adhesive composition is applied to a separator or the like subjected to a peeling treatment, and the pressure-sensitive adhesive layer is formed by drying and removing a polymerization solvent or the like, and then transferred onto an optical film (polarizing film); or a method in which the pressure-sensitive adhesive composition is applied to an optical film (polarizing film), and the polymerization solvent or the like is dried to remove the polymerization solvent and form a pressure-sensitive adhesive layer on the optical film. In the case of applying the adhesive, one or more solvents other than the polymerization solvent may be newly added.

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

From the viewpoint of application to a polarizing film having a profile, the adhesive layer applied to the polarizing film with an adhesive layer of the present invention preferably has a creep value at 85 ℃ of 120 μm or less, more preferably 100 μm or less, further preferably 85 μm or less, and particularly preferably 60 μm or less. The lower limit of the creep value is preferably 15 μm or more, more preferably 30 μm or more. When the creep value exceeds 120 μm, cracks in the polarizing film having a special shape may be deteriorated as described in examples. If the creep value is less than 15 μm, the stress relaxation property of the pressure-sensitive adhesive layer becomes low, and therefore, the pressure-sensitive adhesive layer may be easily peeled off in the durability test.

< transparent layer >

The transparent layer will be described in detail below.

From the viewpoint of thinning and optical reliability, the thickness of the transparent layer is preferably 10 μm or less, more preferably 5 μm or less, further preferably 3 μm or less, further preferably 1.5 μm or less, and further preferably 1 μm or less. When the transparent layer is too thick, the thickness of the polarizing film may become thick, and the optical reliability of the polarizer may be deteriorated. On the other hand, the thickness of the transparent layer is preferably 0.1 μm or more, more preferably 0.2 μm or more, and even more preferably 0.3 μm or more, from the viewpoint of suppressing the variation ratio of the surface resistance value of the pressure-sensitive adhesive layer to a small level.

The transparent layer is formed of a material which has transparency and can suppress the influence of the conductive layer on the polarizer. Examples of such a material include a material containing a urethane prepolymer (a) which is a reaction product of an isocyanate compound and a polyol.

The isocyanate compound is preferably a polyfunctional isocyanate compound, and specifically, a polyfunctional aromatic isocyanate compound, alicyclic isocyanate, aliphatic isocyanate compound, or a dimer thereof may be mentioned.

Examples of the polyfunctional aromatic isocyanate compound include: benzene diisocyanate, 2, 4-toluene diisocyanate, 2, 6-toluene diisocyanate, 2 '-diphenylmethane diisocyanate, 4' -toluidine diisocyanate, 4 '-diphenyl ether diisocyanate, 4' -diphenyl diisocyanate, 1, 5-naphthalene diisocyanate, xylylene diisocyanate, methylenebis 4-phenylisocyanate, 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-diisocyanate methylcyclohexane, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated tetramethylxylylene 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.

The polyfunctional isocyanate compound includes a polyfunctional isocyanate compound having 3 or more isocyanate groups such as tris (6-isocyanatohexyl) isocyanurate.

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, glycerol, trimethylolpropane, pentaerythritol, hexanetriol, polypropylene glycol, and the like.

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

As the urethane prepolymer (a), trimethylolpropane-trimethylbenzene isocyanate and trimethylolpropane-tris (diphenylmethane diisocyanate) are preferably used. The urethane prepolymer (a) is a compound having a terminal isocyanate group, and can be obtained by, for example, mixing an isocyanate compound with a polyol and stirring and reacting the mixture. It is generally preferred to mix the isocyanate compound with the polyol in such a manner that the isocyanate groups are in excess relative to the hydroxyl groups of the polyol.

In addition, a urethane prepolymer having a protective group for a terminal isocyanate group may be used as the urethane prepolymer (a). As the protecting group, there are oxime, lactam and the like. The urethane prepolymer having an isocyanate group protected therein is heated to dissociate the protecting group from the isocyanate group, thereby reacting the isocyanate group.

The material for forming the transparent layer may contain, in addition to the urethane prepolymer (a), a compound (b) having at least 2 functional groups having active hydrogen, which is reactive with an isocyanate group. Examples of the functional group having an active hydrogen reactive with an isocyanate group include a hydroxyl group and an amino group. The number of the functional groups having active hydrogen in the compound (b) is preferably 3 or more because the more the number of the functional groups is, the more the reaction points with the isocyanate groups of the urethane prepolymer (a) are, the more easily a cured product is formed.

Further, it is preferable that the value obtained by dividing the molecular weight of the compound (b) by the number of the functional groups is 350 or less. By defining the relationship between the molecular weight and the number of functional groups in this way, the reactivity of the compound (b) with the isocyanate group of the urethane prepolymer (a) can be ensured.

The molecular weight of the compound (b) is preferably 1000 or less. From the viewpoint of compatibility when a forming material is prepared in the form of a solution together with the urethane prepolymer (a), the molecular weight of the compound (b) is preferably set to a range of 1000 or less.

As the above-mentioned compound (b), for example: polyols, polyamines, compounds having hydroxyl groups and amino groups in the molecule, and the like.

Examples of the polyhydric alcohol include: 2-functional alcohols such as 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, and polypropylene glycol; 3-functional alcohols such as glycerin and trimethylolpropane; 4-functional alcohols such as pentaerythritol, hexanetriol and sorbitol; and alkylene oxide (e.g., propylene oxide) adducts of polyoxypropylene glycerol ether, polyoxypropylene trimethylolpropane ether, polyoxypropylene sorbitol ether, and the like to the above-mentioned polyhydric alcohols.

Examples of polyamines include: ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, isophoronediamine, dicyclohexylmethane-4, 4' -diamine, and dimer diamine.

Examples of the compound having a hydroxyl group and an amino group in the molecule include: diamines having a hydroxyl group in the molecule, such as 2-hydroxyethylethylenediamine, 2-hydroxyethylpropylenediamine, bis (2-hydroxyethyl) ethylenediamine, bis (2-hydroxyethyl) propylenediamine, 2-hydroxypropyl ethylenediamine, and bis (2-hydroxypropyl) ethylenediamine;

alkanolamines such as ethanolamine, diethanolamine, and triethanolamine.

In view of preventing deterioration of optical reliability of the polarizer, a polyol is preferably used as the compound (b), and trimethylolpropane is particularly preferable in view of reactivity with the urethane prepolymer (a).

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 mixing ratio of the compound (b) to the urethane prepolymer (a) is preferably 5% by weight or more based on 100% by weight (solid content ratio) of the total of the urethane prepolymer (a) and the compound (b). 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, deterioration of optical reliability of the polarizer may occur, and therefore, the compounding ratio of the compound (b) is preferably 80% by weight or less, more preferably 50% by weight or less.

In addition, in order to improve the reactivity of the isocyanate group, a reaction catalyst may be used as the forming material. The reaction catalyst is not particularly limited, and a tin-based catalyst or an amine-based catalyst is preferred. One or more kinds of the reaction catalyst may 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 (a). When the amount of the reaction catalyst is large, the crosslinking reaction speed becomes fast, causing foaming of the formed material. Even when the foamed forming material is used, sufficient adhesiveness cannot be obtained. In general, when the reaction catalyst is used, it is preferably 0.01 to 5 parts by weight, and more preferably 0.05 to 4 parts by weight.

In addition, a reaction catalyst may be used in order to increase the reactivity of the isocyanate group. The reaction catalyst is not particularly limited, and a tin-based catalyst or an amine-based catalyst is suitable. One or two or more kinds of the reaction catalysts may be used. The amount of the reaction catalyst used is usually 5 parts by weight or less relative to 100 parts by weight of the urethane prepolymer. When the amount of the reaction catalyst is large, the crosslinking reaction speed becomes fast, and foaming of the formed material occurs. Even when the foamed forming material is used, sufficient adhesiveness cannot be obtained. In general, when a reaction catalyst is used, it is preferably 0.01 to 5 parts by weight, and more preferably 0.05 to 4 parts by weight.

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

The amine catalyst is not particularly limited. For example, a catalyst having at least 1 organic group such as an alicyclic group is preferable, such as quinacridone, amidine, diazabicycloundecene, etc. Further, as the amine catalyst, triethylamine and the like can be mentioned. Examples of the reaction catalyst other than the above include cobalt naphthenate and benzyltrimethylammonium hydroxide.

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

The organic solvent is not particularly limited as long as it does not have a functional group containing an active hydrogen reactive with an isocyanate group and uniformly dissolves the urethane prepolymer (a) and the compound (b) constituting the forming material. The organic solvent may be used singly or in combination of two or more. The organic solvent may be different solvents for the urethane prepolymer (a) and the compound (b). In this case, the respective solutions may be mixed after being prepared, thereby preparing the forming material. In addition, an organic solvent may be further added to the prepared forming material to adjust the viscosity of the forming material. In the case of a solvent-based solution dissolved in an organic solvent, alcohols, water, and the like exemplified below may be contained as the solvent.

As the organic solvent, there may be mentioned: 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; halogenated alkanes such as 1, 2-dichloroethane; ethers such as t-butyl methyl ether; ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cyclopentanone, and acetylacetone.

When the aqueous dispersion is formed, alcohols such as n-butanol and isopropanol, and ketones such as acetone may be added. When the urethane prepolymer is formed into an aqueous solution, the urethane prepolymer may be formed into an aqueous solution by using a dispersant or introducing a functional group having low reactivity with an isocyanate group such as a carboxylate, a sulfonate or a quaternary ammonium salt, or a water-dispersible component such as polyethylene glycol.

Examples of the material for forming the transparent layer other than the urethane prepolymer include: cyanoacrylate-forming materials, epoxy-forming materials, urethane acrylate-forming materials, and the like.

The formation of the transparent layer may be appropriately selected depending on the kind of the formation material, and for example, the formation material may be applied to a polarizer and then cured, and the transparent layer may be obtained as a coating layer. This is generally carried out by the following method: and drying the coating at about 30 to 100 ℃, preferably about 50 to 80 ℃ for about 0.5 to 15 minutes after the coating, thereby forming a cured layer. When the forming material contains an isocyanate component, the reaction may be accelerated by annealing at about 30 to 100 ℃, preferably at about 50 to 80 ℃ for about 0.5 to 24 hours.

< image display panel, image display device >

The polarizing film with an adhesive layer of the present invention can be applied to various image display panels that can be applied to existing image display devices. The other configurations of the image display device are the same as those of the conventional image display device. Specific examples of image Display devices to which the image Display panel can be applied include liquid crystal Display devices, Electroluminescence (EL) displays, Plasma Displays (PDs), Field Emission Displays (FED), and the like.

The polarizing film with an adhesive layer of the present invention has a small variation ratio of surface resistance value, and is preferably applied to a liquid crystal panel incorporating a touch sensor function.

In addition to the above-described configuration, optical films such as a retardation film, a viewing angle compensation film, and a luminance enhancement film can be suitably provided in the liquid crystal panel.

The liquid crystal layer is not particularly limited, and for example: and liquid crystal layers of any type such as TN type, STN type, pi type, VA type, IPS type, and the like. The transparent substrate 9 (light source side) is not particularly limited as long as it is a transparent substrate, and its raw materials include, for example: glass, transparent resin film substrate. As the transparent resin film substrate, those described above can be cited.

The polarizing film with an adhesive layer conventionally used in the art may be used on the light source side of the liquid crystal layer, and the polarizing film with an adhesive layer described in this specification may be preferably used.

Specific examples of the liquid crystal panel with a touch sensor function are shown in fig. 6 to 8. Fig. 6 to 8 illustrate the case where the polarizing film with an adhesive layer 1 (in which the conductive layer c is omitted) shown in fig. 1 is used as the polarizing film with an adhesive layer of the present invention on the viewing side of the liquid crystal cell. That is, the one-side protective polarizing film 11 and the adhesive layer 21 in fig. 1 are illustrated as the first polarizing film 11 and the first adhesive layer 21 in fig. 6 to 8.

Fig. 6 shows a so-called in-cell touch sensor function-equipped liquid crystal panel having a configuration of, from the viewing side, a first polarizing film 11, a first pressure-sensitive adhesive layer 21, a first transparent substrate 41, a touch sensor unit 5, a liquid crystal layer 3, a driving electrode/sensor unit 6, a second transparent substrate 42, a second pressure-sensitive adhesive layer 22, and a second polarizing film 12. In the in-cell type touch sensor function-built liquid crystal panel of fig. 6, for example, the liquid crystal cell C has a touch sensor portion 5 and a driving electrode/sensor portion 6 in the first and second glass substrates 41 and 42 (in the liquid crystal cell) holding the liquid crystal layer 3.

Fig. 7 shows a modification of the so-called in-cell (half-cell) touch sensor function-incorporating liquid crystal panel, which has a configuration of the first polarizing film 11, the first pressure-sensitive adhesive layer 21, the touch sensor unit 5, the first transparent substrate 41, the liquid crystal layer 3, the driving electrode/sensor unit 6, the second transparent substrate 42, the second pressure-sensitive adhesive layer 22, and the second polarizing film 12 from the viewing side. In the liquid crystal panel with built-in touch sensor function of the built-in type shown in fig. 7, for example, the touch sensor section 5 of the liquid crystal cell C is in direct contact with the first pressure-sensitive adhesive layer 21 on the outer side of the first transparent substrate 41, and the driving electrode/sensor section 6 is provided on the side of the second transparent substrate 42 in the first and second glass substrates 41 and 42 (in the liquid crystal cell) sandwiching the liquid crystal layer 3.

Fig. 8 shows a so-called external-mount type touch sensor function-incorporated liquid crystal panel having a configuration of, from the viewing side, a first polarizing film 11, a first pressure-sensitive adhesive layer 21, a touch sensor unit 5, a driving electrode/sensor unit 6, a first transparent substrate 41, a liquid crystal layer 3, a driving electrode 7, a second transparent substrate 42, a second pressure-sensitive adhesive layer 22, and a second polarizing film 12. In the externally-embedded touch sensor function-incorporated liquid crystal panel of fig. 8, for example, the liquid crystal cell C has a touch sensor portion 5 and a drive electrode/sensor portion 6 on the outer side of the first transparent substrate 41, the touch sensor portion 5 is in direct contact with the first pressure-sensitive adhesive layer 21, and the drive electrode 7 is provided on the second transparent substrate 42 side in the first and second glass substrates 41 and 42 (in the liquid crystal cell) sandwiching the liquid crystal layer 3.

In the liquid crystal panel with a built-in touch sensor function, when the touch sensor portion 5 of the liquid crystal cell C is in direct contact with the first pressure-sensitive adhesive layer 21, the antistatic function of the first pressure-sensitive adhesive layer 21 (containing an ionic compound) is likely to be lowered, and particularly, in a humidified environment, is likely to be lowered. Therefore, in the example of the above example, the liquid crystal panel with a built-in touch sensing function of the present invention is suitably applied to a liquid crystal panel with a built-in touch sensing function of an in-cell type (modification) shown in fig. 7 or an out-cell type shown in fig. 8.

The first polarizing film 11 disposed on the viewing side and the second polarizing film 12 disposed on the opposite side to the viewing side of the liquid crystal cell C may be used by laminating other optical films according to the arrangement positions thereof. Examples of the other optical film include: optical films that are optical layers used in the formation of liquid crystal display devices and the like in some cases, such as reflection plates, reflection/transmission plates, retardation films (including 1/2 wave plates, 1/4 wave plates, and the like), optical compensation films, and luminance enhancement films. These other optical films may be used in 1 or more than 2 layers. In the case of using these other optical films, the pressure-sensitive adhesive layer closest to the liquid crystal layer 3 is also preferably used as the first pressure-sensitive adhesive layer 21.

The liquid crystal layer 3 included in the liquid crystal cell C is a liquid crystal layer suitable for a liquid crystal panel incorporating a touch sensing function, and includes liquid crystal molecules that are uniformly aligned in the absence of an electric field. As the liquid crystal layer 3, for example, an IPS liquid crystal layer is preferably used. As the liquid crystal layer 3, any type of liquid crystal layer such as TN type, STN type, pi type, VA type, or the like can be used. The thickness of the liquid crystal layer is, for example, about 1.5 to 4 μm.

In the liquid crystal cell C, the first transparent substrate 41 and the second transparent substrate 42 can sandwich the liquid crystal layer 3 to form a liquid crystal cell. The touch sensor unit 5, the drive electrode/sensor unit 6, the drive electrode 7, and the like are formed in the liquid crystal cell or outside the liquid crystal cell according to the form of the liquid crystal panel incorporating the touch sensing function. In addition, a color filter substrate may be provided on the liquid crystal cell (first transparent substrate 41).

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

The touch sensor section 5 (capacitive sensor), the drive electrode/sensor section 6, and the drive electrode 7 are formed as transparent conductive layers. The material constituting the transparent conductive layer is not particularly limited, and examples thereof include: metals such as gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, and tungsten, and alloys of these metals. As a material constituting the transparent conductive layer, metal oxides of indium, tin, zinc, potassium, antimony, zirconium, and cadmium, specifically, metal oxides of indium oxide, tin oxide, titanium oxide, cadmium oxide, and a mixture thereof can be cited. In addition, other metal compounds composed of copper iodide or the like are used. The metal oxide may further contain an oxide of a metal atom shown in the above group, as necessary. For example, indium oxide (ITO) containing tin oxide, tin oxide containing antimony, or the like is preferably used, and ITO is particularly preferably used. The ITO preferably contains 80 to 99 wt% of indium oxide and 1 to 20 wt% of tin oxide.

The position of forming the touch sensor layer 5 in the liquid crystal cell C is not particularly limited, and the touch sensor layer 5 is formed according to the form of a liquid crystal panel incorporating a touch sensing function. For example, fig. 6 to 8 illustrate a case where the touch sensor layer 5 is disposed between the first polarizing film 11 and the liquid crystal layer 3. The touch sensor layer 5 may be formed in the form of a transparent electrode pattern on the first transparent substrate 41, for example. The driving electrode/sensor section 6 and the driving electrode 7 may be formed with a transparent electrode pattern by a usual method according to the form of a liquid crystal panel incorporating a touch sensing function. The transparent electrode pattern is usually electrically connected to a wire (not shown) formed at an end portion of the transparent substrate, and the wire is connected to a controller IC (not shown). The shape of the transparent electrode pattern may be any shape such as a stripe shape or a diamond shape, in addition to the comb shape, depending on the application. The transparent electrode pattern has a height of, for example, 10 to 100nm and a width of, for example, 0.1 to 5 mm.

In addition, a liquid crystal panel incorporating a touch sensor function can be suitably used as a member for forming a liquid crystal display device, such as a member using a backlight or a reflector in an illumination system.

Examples

The present invention will be specifically described below by way of production examples, but the present invention is not limited to these examples. In each example, parts and% are on a weight basis. The following conditions of standing at room temperature are not particularly limited, and are 23 ℃ and 65% RH.

< (meth) acrylic Polymer (A) determination of weight-average molecular weight

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

An analysis device: HLC-8120GPC, manufactured by Tosoh corporation

Column: G7000H, manufactured by Tosoh corporation_XL+GMH_XL+GMH_XL

Column size: each 7.8mm phi x 30cm totals 90cm

Column temperature: 40 deg.C

Flow rate: 0.8mL/min

Injection amount: 100 μ L

Eluent: tetrahydrofuran (THF)

The detector: differential Refractometer (RI)

Standard sample: polystyrene

< production example 1 >

(preparation of 40 μm TAC film with HC and 25 μm TAC film with HC)

In a resin solution obtained by dissolving ultraviolet curable resin monomer or oligomer containing urethane acrylate as main component in butyl acetateTo the solution (trade name: UNIDIC17-806, manufactured by DIC K.K., solid content concentration: 80%) were added 5 parts of a photopolymerization initiator (IRGACURE 907, manufactured by BASF K.) and 0.1 part of a leveling agent (trade name: GRANDIC PC4100, manufactured by DIC K.K.) per 100 parts of the solid content in the solution. Next, cyclopentanone and propylene glycol monomethyl ether were added to the solution at a ratio of 45:55 so that the solid content concentration in the solution became 36%, thereby producing a hard coat layer-forming material. The hard coat layer-forming material thus prepared was applied to TJ40UL (Fuji film, raw material: cellulose triacetate polymer, thickness: 40 μm) so that the thickness of the hard coat layer after curing became 7 μm, to form a coating film. Then, the coating film was dried at 90 ℃ for 1 minute, and the coating film was further irradiated with a cumulative light amount of 300mJ/cm using a high-pressure mercury lamp²The coating film was cured by the ultraviolet ray of (2) to form a hard coat layer (HC), and a 40 μm TAC film with HC was prepared.

In addition, a hard coat layer (HC) having a thickness of 7 μm was formed on TJ25UL (Fuji film, raw material: cellulose triacetate polymer, thickness: 25 μm) in the same manner as above, and a HC-attached 25 μmTAC film was produced.

< production example 2 >

(preparation of 30 μm acrylic film)

A30L tank reactor equipped with a stirrer, a temperature sensor, a condenser and a nitrogen gas inlet was charged with 8000g of Methyl Methacrylate (MMA), 2000g of methyl 2- (hydroxymethyl) acrylate (MHMA), 10000g of 4-methyl-2-pentanone (methyl isobutyl ketone, MIBK) and 5g of n-dodecyl mercaptan, and heated to 105 ℃ while introducing nitrogen gas, and refluxed, and then 5.0g of t-butyl peroxyisopropylcarbonate (Kayakubon BIC-7, manufactured by Kayaku Akzo Co., Ltd.) was added as a polymerization initiator, and a solution of 10.0g of t-butyl peroxyisopropylcarbonate and 230g of MIBK was added dropwise over 4 hours, followed by solution polymerization at about 105 to 120 ℃ under reflux, and aging was further carried out over 4 hours.

30g of stearyl phosphate/distearyl phosphate mixture (Phoslex A-18, manufactured by Sakai Chemical Industry Co.) was added to the obtained polymer solution, and a cyclized condensation reaction was carried out at about 90 to 120 ℃ for 5 hours under reflux. Then, the obtained polymer solution was introduced into a vented twin-screw extruder (phi 29.75mm, L/D30) having a cylinder temperature of 260 ℃, a rotational speed of 100rpm, a reduced pressure of 13.3 to 400hPa (10 to 300mmHg), a number of back vent holes of 1 and a number of front vent holes of 4 at a processing speed of 2.0kg/h in terms of the amount of resin, and subjected to cyclization condensation reaction and devolatilization in the extruder to obtain transparent pellets of a lactone ring-containing polymer.

The lactone ring-containing polymer thus obtained was subjected to dynamic TG measurement, and as a result, a mass decrease of 0.17 mass% was detected. Further, the lactone ring-containing polymer had a weight average molecular weight of 133000, a melt flow rate of 6.5g/10min and a glass transition temperature of 131 ℃.

The obtained pellets were kneaded and extruded with acrylonitrile-styrene (AS) resin (Toyo AS20, Toyo styrene Co., Ltd.) at a mass ratio of 90/10 using a single-screw extruder (screw 30 mm. phi.), to obtain transparent pellets. The glass transition temperature of the resulting particles was 127 ℃.

The pellets were melt-extruded from a hanger-type T-die having a width of 400mm using a 50mm phi single screw extruder to prepare a film having a thickness of 120. mu.m. The produced film was stretched to 2.0 times in the machine direction and 2.0 times in the cross direction at a temperature of 150 ℃ using a biaxial stretching machine, to obtain a stretched film (30 μm acrylic film) having a thickness of 30 μm. The optical properties of the stretched film were measured, and as a result, the total light transmittance was 93%, the in-plane retardation Δ nd was 0.8nm, and the thickness direction retardation Rth was 1.5 nm.

< production of polarizing film (1) >

A polyvinyl alcohol film having a thickness of 45 μm was dyed in a 0.3% iodine solution at 30 ℃ for 1 minute while being stretched 3-fold between rolls having different speed ratios. Then, the resultant was immersed in an aqueous solution containing 4% boric acid and 10% potassium iodide at 60 ℃ for 0.5 minute while stretching to a total stretching ratio of 6 times. Then, the plate was immersed in an aqueous solution containing potassium iodide at a concentration of 1.5% at 30 ℃ for 10 seconds, washed, and then dried at 50 ℃ for 4 minutes to obtain a polarizer having a thickness of 18 μm. The saponified 40 μm TAC film with HC (cellulose triacetate film side) obtained in production example 1 was bonded to one surface of the polarizer with a polyvinyl alcohol adhesive, and the 30 μm acrylic film obtained in production example 2 was bonded to the other surface to prepare a polarizing film (1).

< production of polarizing film (2) >

(production of thin polarizer A)

One surface of a substrate of an amorphous isophthalic acid-copolymerized polyethylene terephthalate (IPA-copolymerized PET) film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of 75 ℃ was subjected to corona treatment, and an aqueous solution containing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl-modification rate 4.6%, saponification degree 99.0 mol% or more, manufactured by japan synthetic chemical industries, ltd., trade name "GOHSEFIMER Z200") in a ratio of 9:1 was applied to the corona-treated surface at 25 ℃ and dried to form a PVA-based resin layer having a thickness of 11 μm, thereby producing a laminate.

The resultant laminate was subjected to free-end uniaxial stretching (auxiliary stretching treatment in a gas atmosphere) of 2.0 times in the longitudinal direction (longitudinal direction) in an oven at 120 ℃ between rolls having different peripheral speeds.

Next, the laminate was immersed in an insolubilization bath (an aqueous boric acid solution prepared by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 30 ℃ for 30 seconds (insolubilization treatment).

Next, the polarizing plate was immersed in a dyeing solution at a liquid temperature of 30 ℃ while adjusting the iodine concentration and the immersion time so as to achieve a predetermined transmittance. In this example, an aqueous iodine solution prepared by adding 0.2 parts by weight of iodine and 1.0 part by weight of potassium iodide to 100 parts by weight of water was immersed for 60 seconds (dyeing treatment).

Subsequently, the substrate was immersed in a crosslinking bath (aqueous boric acid solution prepared by mixing 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30 ℃ for 30 seconds (crosslinking treatment).

Then, the laminate was immersed in an aqueous boric acid solution (aqueous solution prepared by mixing 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 70 ℃, and uniaxially stretched in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds so that the total stretching ratio became 5.5 times (stretching treatment in the aqueous solution).

Then, the laminate was immersed in a cleaning bath (aqueous solution containing 4 parts by weight of potassium iodide per 100 parts by weight of water) at a liquid temperature of 30 ℃ (cleaning treatment).

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

(preparation of adhesive for transparent protective film)

An ultraviolet-curable adhesive was prepared by mixing 45 parts by weight of acryloylmorpholine, 45 parts by weight of 1, 9-nonanediol diacrylate, 10 parts by weight of an acrylic oligomer obtained by polymerizing a (meth) acrylic monomer (ARUFON UP1190, manufactured by Toyo Synthesis Co., Ltd.), 3 parts by weight of a photopolymerization initiator (IRGACURE 907, manufactured by BASF Co., Ltd.), and 1.5 parts by weight of a polymerization initiator (KAYACURE DETX-S, manufactured by Kayaku chemical Co., Ltd.).

< production of polarizing film (2) >

The adhesive was cured by applying the ultraviolet-curable adhesive to the surface of the polarizer a of the optical film laminate so that the thickness of the cured adhesive layer became 1 μm, and simultaneously bonding the 25 μm TAC film (cellulose triacetate film side) with HC obtained in production example 1, and then irradiating ultraviolet rays as active energy rays. The ultraviolet irradiation uses a gallium-sealed metal halide lamp and an irradiation device: light HAMMER10 manufactured by fusion uv Systems, valve: v valve, maximum illumination 1600mW/cm²Cumulative dose of radiation 1000/mJ/cm²(wavelength 380 to 440nm) and the illuminance of ultraviolet light were measured by using Sola-Check system manufactured by Solatell corporation. Then, the amorphous PET substrate was peeled off, and a polarizing film (2) using a thin polarizer was produced. The optical properties of the resulting polarizing film were: the monomer transmittance is 42.8 percent, and the polarization degree is 99.99 percent.

< production of polarizing film (2) with transparent layer >

After coating the polarizing plate surface (polarizing plate surface not provided with HC-containing 25 μm tac film) of the polarizing film (2) with a transparent layer-forming material described below by a wire bar coater, the coating was subjected to heat treatment at 60 ℃ for 12 hours to form a urethane resin layer having a thickness of 3 μm, thereby producing a polarizing film (2) with a transparent layer.

Material for Forming transparent layer

As the solution of the urethane prepolymer (a), a 75% ethyl acetate solution of a urethane prepolymer prepared from Tolylene Diisocyanate (TDI) and Trimethylolpropane (TMP) (trade name "Coronate L" available from Tosoh Corp.).

On the other hand, a trimethylolpropane solution was prepared by dissolving trimethylolpropane in cyclopentanone so that the solid content concentration became 10%.

To 100 parts of a 75% ethyl acetate solution of the urethane prepolymer (product of Tosoh corporation, trade name "Coronate L") was added the above trimethylolpropane solution so that the ratio of urethane prepolymer: the solid content ratio of trimethylolpropane was 90:10, 0.1 part of dioctyltin dilaurate catalyst (product name "EMBILIZER OL-1" available from Tokyo Seiki Kaisha) was further added, and a solid content concentration of methyl isobutyl ketone as a solvent was adjusted to 10%, thereby preparing a forming material (coating liquid).

< preparation of Material for Forming conductive layer >

8.6 parts by weight, in terms of solid content, of a solution containing 10 to 50% by weight of a thiophene polymer (trade name: Dentron P-580W, manufactured by Nagase ChemteX Co., Ltd.) was added

A solution of an oxazoline-based acrylic polymer (trade name: EPOCROS WS-700, manufactured by Nippon catalyst Co., Ltd.) was mixed with 1 part of water 90.4 parts to prepare a coating liquid for forming a conductive layer, the solid content of which was 0.5% by weight. The obtained coating liquid for forming a conductive layer contained 0.04% by weight of a polythiophene polymer and contained

Oxazoline-based acrylic acid polymer 0.25 wt%.

Example 1

(preparation of polarizing film with conductive layer)

The coating liquid for forming a conductive layer was applied to the acrylic film side of the polarizing film (1) so that the thickness after drying became 0.06 μm, and dried at 80 ℃ for 2 minutes to form a conductive layer. The resulting conductive layer contained 8 wt% and 8 wt% of a thiophene polymer

Oxazoline-based acrylic polymer 50 wt%.

(preparation of acrylic Polymer (A))

A monomer mixture containing 78.9 parts of butyl acrylate, 16 parts of phenoxyethyl acrylate, 5 parts of acrylic acid and 0.1 part of 4-hydroxybutyl acrylate was placed in a four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet and a condenser. Further, 0.1 part of 2, 2' -azobisisobutyronitrile as a polymerization initiator was added to 100 parts of the monomer mixture (solid content) together with 100 parts of ethyl acetate, nitrogen gas was introduced while slowly stirring to replace nitrogen gas, and then the polymerization reaction was carried out for 8 hours while maintaining the liquid temperature in the flask at about 55 ℃.

(preparation of adhesive composition)

A solution of an acrylic pressure-sensitive adhesive composition was prepared by mixing 100 parts of the solid content of the acrylic polymer solution obtained above with 1 part of lithium bis (trifluoromethanesulfonyl) imide, 0.6 part of an isocyanate crosslinking agent (Coronate L, trimethylolpropane tolylene diisocyanate, manufactured by Tosoh Corp.), 0.1 part of benzoyl peroxide (NYPER BMT, manufactured by Nippon fat Co., Ltd.), and 0.3 part of an epoxy group-containing silane coupling agent (X-41-1056, manufactured by shin Etsu chemical Co., Ltd.).

(production of polarizing film with adhesive layer)

Next, the solution of the acrylic pressure-sensitive adhesive composition was applied to a silicone-based release agent-treated surface of a polyethylene terephthalate film (separator: MRF38, manufactured by Mitsubishi chemical polyester film Co., Ltd.), and dried at 155 ℃ for 1 minute so that the thickness of the pressure-sensitive adhesive layer after drying became 20 μm, and a pressure-sensitive adhesive layer was formed on the surface of the separator. Next, the pressure-sensitive adhesive layer formed on the separator was transferred to the conductive layer of the polarizing film (1) produced above, to produce a polarizing film with a pressure-sensitive adhesive layer.

Examples 2 to 13 and comparative examples 1 and 2

In example 1, solutions of the acrylic polymer (a) shown in table 1 were prepared by changing the kind of monomers used for the preparation of the acrylic polymer (a) and the use ratio thereof, and controlling the production conditions as shown in table 1.

A polarizing film with an adhesive layer was produced in the same manner as in example 1, except that the type of the polarizing film, the presence or absence of the conductive layer, the type of the ionic compound (B) used for the preparation of the adhesive composition, the mixing ratio thereof, and the mixing amount of the crosslinking agent were changed as shown in table 1. In the case of using the polarizing film (2) as a polarizing film, the pressure-sensitive adhesive layers shown in table 1 were formed on the polarizer side of the polarizing film (2) (polarizer side on which HC-containing 25 μm TAC film was not provided) in the same manner as described above, and in the case of using the polarizing film (2) with a transparent layer as a polarizing film, the same conductive layer as described above was formed on the transparent layer of the polarizing film (2) with a transparent layer. In comparative examples 1 and 2, no conductive layer was formed.

The polarizing films with adhesive layers obtained in the above examples and comparative examples were subjected to the following evaluations, and the evaluation results are shown in table 1.

< sheet resistance value (Ω/□): conductivity >

The surface resistance value of the conductive layer was measured with respect to the conductive layer-side surface of the conductive layer-attached polarizing film before the adhesive layer was formed. The surface resistance value of the pressure-sensitive adhesive layer formed on the separator was measured. The measurement was performed using MCP-HT450 manufactured by Mitsubishi Chemical Analytech Co., Ltd.

< determination of creep value >

The upper end portion 10mm × 10mm of the polarizing film with an adhesive layer (thickness of the adhesive layer: 20 μm) cut into a size of 10mm × 30mm was attached to a SUS plate through the adhesive layer, and autoclave treatment was performed at 50 ℃ under 5 atm for 15 minutes. A precision hot plate provided so that the heating surface was perpendicular was heated to 85 ℃, and a SUS plate to which the polarizing film with the adhesive layer was attached was provided so that the side to which the adhesive layer was not attached was in contact with the heating surface of the hot plate. After heating the SUS plate at 85 ℃ for 5 minutes, a load of 500g was applied to the lower end of the polarizing film with an adhesive layer, and the magnitude of the offset between the polarizing film with an adhesive layer and the SUS plate before and after the polarizing film was left for 1 hour was measured and the magnitude of the offset was defined as the creep value (μm) at 85 ℃.

< evaluation of abnormal cracking >

Using CO₂The polarizing film with the pressure-sensitive adhesive layer thus produced was processed into the shape shown in FIG. 5 by a laser processing machine Spirit (30W, GCC) at a speed of 10 and a laser output of 35 ppi or 400 ppi.

The polarizing film with the pressure-sensitive adhesive layer, which had been subjected to profile processing, was bonded to alkali-free glass (product name "EG-XG" from Corning) having a thickness of 350 mm. times.250 mm. times.0.7 mm, and then autoclave treatment was carried out at 50 ℃ and 0.5MPa for 15 minutes to bond the pressure-sensitive adhesive layer to the glass. The sample subjected to the treatment was put into a heating cycle test chamber, and the presence or absence of cracks generated in the deformed portion at the time of 100 cycles and 200 cycles was confirmed by visual observation. 5 identical samples were charged under each condition, and the number of samples having cracks is shown in Table 1.

(test conditions)

Temperature conditions: will be provided with

As a cycle and repeated, and its temperature rise/fall rate: 10 ℃/min

< ESD test >

After the separator was peeled off from the polarizing film with an adhesive layer, the resultant was attached to the visible side of the embedded liquid crystal cell, thereby producing a liquid crystal panel with a built-in touch sensor function. That is, the obtained polarizing film with an adhesive layer was bonded to the first transparent substrate of the in-cell liquid crystal cell shown in fig. 6, to form a first adhesive layer and a first polarizing film. An ESD (electrostatic discharge) gun (10kV) was applied to the polarizing film surface of the liquid crystal panel, and the time until the white spot portion was disappeared by the electricity was measured and judged according to the following criteria.

(evaluation criteria)

A: within 0.5 second

B: more than 0.5 second and within 1 second

C: more than 1 second and less than 10 seconds

D: more than 10 seconds

< durability test >

The polarizing film with the adhesive layer thus produced was cut into a size of 300 × 220mm so that the absorption axis of the polarizing film was parallel to the long side. The polarizing film with the adhesive layer was bonded to alkali-free glass (product name "EG-XG" manufactured by Corning corporation) having a thickness of 350X 250mm X0.7 mm by using a laminator. Then, autoclave treatment was performed at 50 ℃ and 0.5MPa for 15 minutes to bond the pressure-sensitive adhesive layer to the glass. The sample subjected to this treatment was subjected to a treatment at 95 ℃ for 500 hours in an atmosphere and then to a treatment at 60 ℃/95% RH for 500 hours, and then the appearance of the sample was evaluated by visual observation according to the following criteria.

(evaluation criteria)

A: no change in appearance such as foaming and peeling was observed.

B: the end portions were slightly peeled off or foamed, but there was no problem in practical use.

C: although the end portion is peeled off or foamed, there is no problem in practical use as long as it is not a special use.

D: the end portions are significantly peeled off, which is problematic in practical use.

< evaluation of end discoloration >

The polarizing films with adhesive layers obtained in examples and comparative examples were cut into 50mm × 50mm pieces, and after the separators were peeled off, alkali glass (microscope slide glass, manufactured by Sonbo-Nippon Co., Ltd.) having a thickness of 1.2 to 1.5mm was bonded via the adhesive layers to prepare samples. The sample was kept at 60 ℃ under a high-temperature and high-humidity environment of 90% RH for 500 hours, and then the amount of end discoloration was measured under the following conditions by a differential interference microscope (product name "MX-61L" manufactured by Olympus). The amount of end discoloration was measured as follows: the distance between the straight line connecting the corner and the position closest to the central portion in the portion where the color is lighter than the central portion on the diagonal lines of the four corners of the sample is defined as the end discoloration amount (μm), and the average value of the four corners is defined as the end discoloration amount of the sample.

The device comprises the following steps: MX-61L manufactured by Olympus Inc

Measurement conditions

Lens magnification: 5 times of

ISO：200

Shutter speed: 1/100

Amount of reflected light: scale 0

White balance: automatic

A transmitted light controller: LG-PS2

Amount of transmitted light: scale 5

Polarization direction of transmitted light: in a direction orthogonal to the transmission axis of the polarizing film

In the context of table 1, the following,

BA represents a butyl acrylate and is a butyl acrylate,

PEA represents a phenoxyethyl acrylate having a structure represented by,

AA represents an acrylic acid, and AA represents an acrylic acid,

NVP represents N-vinyl-2-pyrrolidone,

HBA represents 4-hydroxybutyl acrylate,

isocyanates are isocyanate crosslinking agents (Coronate L, trimethylolpropane toluene diisocyanate, manufactured by Tosoh Corona Co., Ltd.),

BPO represents benzoyl peroxide (NYPER BMT manufactured by Nippon fat Co., Ltd.),

Li-TFSI represents lithium bis (trifluoromethanesulfonyl) imide,

K-TFSI represents potassium bis (trifluoromethanesulfonyl) imide,

TMPA-TFSI represents trimethylpropylammonium bis (trifluoromethanesulfonyl) imide salt,

EMP-TFSI stands for ethylmethylpyrrolidine

Bis (trifluoromethanesulfonyl) imide salts,

TBMA-TFSI represents tributylmethylammonium bis (fluoromethanesulfonyl) imide salt,

MTOA-TFSI represents methyltrioctylammonium bis (trifluoromethanesulfonyl) imide salt.

Claims

1. A polarizing film with an adhesive layer, comprising a polarizing film, a conductive layer and an adhesive layer in this order, the polarizing film having a polarizer and a protective film provided on one or both surfaces of the polarizer,

the polarizing film with an adhesive layer has a profile other than a rectangle,

2. The adhesive layer-equipped polarizing film according to claim 1,

the conductive layer contains a conductive polymer.

3. The adhesive layer-equipped polarizing film according to claim 1 or 2,

the thickness of the conductive layer is 1 [ mu ] m or less.

4. The adhesive layer-equipped polarizing film according to any one of claims 1 to 3,

the cationic component of the ionic compound (B) has a molecular weight of 210 or less.

5. The adhesive layer-equipped polarizing film according to claim 4,

the cationic component is lithium ions.

6. The adhesive layer-equipped polarizing film according to any one of claims 1 to 5, wherein the ionic compound (B) is contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the (meth) acrylic polymer (A).

7. The adhesive layer-equipped polarizing film according to any one of claims 1 to 6,

the protective film is any one selected from a cellulose resin film and a (meth) acrylic resin film.

8. The adhesive layer-equipped polarizing film according to any one of claims 1 to 7,

the thickness of the polarizer is less than 10 μm.

9. The adhesive layer-equipped polarizing film according to any one of claims 1 to 8,

the polarizing film is a single-sided protective polarizing film having a polarizer and a protective film provided only on one surface of the polarizer.

10. The adhesive layer-equipped polarizing film according to claim 9,

the one-side protective polarizing film has the conductive layer on the other surface of the polarizer.

11. The adhesive layer-equipped polarizing film according to claim 10,

the other surface of the polarizer in the one-side protective polarizing film has the conductive layer through a transparent layer having a thickness of 10 μm or less directly formed on the polarizer.

12. The adhesive layer-equipped polarizing film according to claim 11,

the transparent layer is a cured product of a forming material containing a urethane prepolymer which is a reaction product of an isocyanate compound and a polyol.

13. The adhesive layer-equipped polarizing film according to any one of claims 1 to 12,

the adhesive layer has a creep value at 85 ℃ of 120 [ mu ] m or less.

14. An image display panel having the adhesive layer-attached polarizing film according to any one of claims 1 to 13.

15. The image display panel according to claim 14,

the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer-attached polarizing film is bonded to a liquid crystal cell having a liquid crystal layer and a touch sensor unit and having a touch sensor function built therein.

16. An image display device having the image display panel according to claim 14 or 15.