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

Abstract

To provide a polarizing film with an adhesive layer having irregularly shaped portions, which can suppress the occurrence of irregularly shaped cracks and has an antistatic function that can suppress static electricity unevenness, even when applied to an in-cell type liquid crystal panel. [Solution] A polarizing film with an adhesive layer having a polarizer, a polarizing film having a protective film on one or both sides of the polarizer, a conductive layer, and an adhesive layer in this order, wherein the polarizing film with an adhesive layer has irregularly shaped portions other than rectangles, and the adhesive layer is formed from an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B).

Description

[Technical Field]

[0001] The present invention relates to an adhesive-coated polarizing film having irregularly shaped portions other than rectangular. The present invention also relates to an image display panel and an image display device to which the adhesive-coated polarizing film is applied. [Background technology]

[0002] In image display panels, such as liquid crystal displays, a liquid crystal panel typically consists of a liquid crystal cell formed from a liquid crystal layer placed between a pair of transparent substrates, with a polarizing film laminated on both sides via an adhesive layer. However, during the manufacturing of the image display panel, when the adhesive-layered polarizing film is attached to the liquid crystal cell, a release film is peeled off from the adhesive layer of the polarizing film. This peeling off of the release film generates static electricity. This generated static electricity can, for example, affect the orientation of the liquid crystal layer inside the liquid crystal display panel, leading to defects. The generation of static electricity can be suppressed, for example, by forming an antistatic layer (conductive layer) on the outer surface of the polarizing film.

[0003] For example, Patent Document 1 describes a liquid crystal display device with a touch sensing function, in order to reduce the occurrence of display defects and malfunctions, the surface resistance value is 1.0 × 10 9 ~1.0×10 11 It has been proposed to place a polarizing film having an antistatic layer with an Ω / □ ratio on the viewing side of the liquid crystal layer. It is also known that the generation of static electricity can be suppressed by adding an ionic compound as an antistatic agent to the adhesive layer.

[0004] On the other hand, in recent years, the use of irregularly shaped in-cell liquid crystal display devices has increased in smartphones and car navigation systems, and irregularly shaped polarizing films are also being used to match these devices. Patent Document 2 discloses a method for manufacturing a polarizing film having an irregular shape other than a rectangle by processing a polarizing film. Patent Document 3 proposes improving the ability to punch out irregular shapes of polarizing films and the crack durability of the punched irregularly shaped polarizing films after heat cycle testing by incorporating irregularly shaped inorganic particles into a transparent protective film used for polarizing films. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2013-105154 [Patent Document 2] Japanese Patent Publication No. 2017-151191 [Patent Document 3] Japanese Patent Publication No. 2017-097111 [Overview of the project] [Problems that the invention aims to solve]

[0006] According to the polarizing film having an antistatic layer described in Patent Document 1, static electricity generation can be suppressed. However, even with an adhesive layer polarizing film having an antistatic layer or an adhesive layer containing an ionic compound, static electricity unevenness could not be sufficiently suppressed. Furthermore, in the case of an irregularly shaped adhesive layer polarizing film, an adhesive layer polarizing film having an antistatic layer or an adhesive layer containing an ionic compound could not sufficiently suppress irregular cracks occurring in the irregularly shaped parts. In particular, when an adhesive layer polarizing film containing an ionic compound in the adhesive layer and having an irregularly shaped part is applied to an in-cell type liquid crystal panel, it is necessary to add a large amount of the ionic compound to the adhesive layer, and as a result, it was found that irregular cracks occurring in the irregularly shaped parts worsen.

[0007] The present invention aims to provide a polarizing film with an adhesive layer having irregularly shaped portions, which can suppress the occurrence of irregularly shaped cracks and also has an antistatic function that can suppress static electricity unevenness, even when applied to an in-cell type liquid crystal panel.

[0008] Furthermore, the present invention aims to provide an image display panel and an image display device to which the aforementioned polarizing film with an adhesive layer is applied. [Means for solving the problem]

[0009] As a result of diligent research to solve the aforementioned problems, the inventors of this invention discovered the following polarizing film with an adhesive layer, and thus completed the present invention.

[0010] In other words, the present invention is A polarizing film with an adhesive layer having a polarizer, a polarizing film having a protective film on one or both sides of the polarizer, a conductive layer, and an adhesive layer in this order, The aforementioned polarizing film with adhesive layer has irregularly shaped portions other than rectangular, The present invention relates to a polarizing film with an adhesive layer, characterized in that the adhesive layer is formed from an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B).

[0011] In the aforementioned polarizing film with an adhesive layer, it is preferable that the conductive layer contains a conductive polymer.

[0012] In the aforementioned polarizing film with adhesive layer, it is preferable that the thickness of the conductive layer is 1 μm or less.

[0013] In the aforementioned polarizing film with adhesive layer, the ionic compound (B) is preferably such that the molecular weight of the cationic component is 210 or less. Furthermore, the cationic component is preferably a lithium ion.

[0014] In the aforementioned polarizing film with adhesive layer, it is preferable that the ionic compound (B) is contained in an amount of 0.1 to 10 parts by weight per 100 parts by weight of the (meth)acrylic polymer (A).

[0015] In the aforementioned polarizing film with adhesive layer, it is preferable that the protective film is selected from either a cellulose resin film or a (meth)acrylic resin film. Furthermore, it is preferable that the thickness of the polarizer in the polarizing film is 10 μm or less.

[0016] In the aforementioned polarizing film with adhesive layer, the polarizing film can be a polarizer and a single-protected polarizing film having a protective film on only one side of the polarizer. In the single-protected polarizing film, it is preferable that the conductive layer is on the other side of the polarizer.

[0017] The aforementioned protective polarizing film may have the conductive layer on the other side of the polarizer via a transparent layer with a thickness of 10 μm or less that is directly formed on the polarizer. As the transparent layer, a cured product of a forming material containing a urethane prepolymer, which is a reaction product of an isocyanate compound and a polyhydric alcohol, can be used.

[0018] In the aforementioned polarizing film with an adhesive layer, it is preferable that the adhesive layer has a creep value of 120 μm or less at 85°C.

[0019] The present invention also relates to an image display panel characterized by having the aforementioned polarizing film with an adhesive layer. The image display panel can be applied to a liquid crystal cell with a built-in touch sensing function having a liquid crystal layer and a touch sensor portion, to which the adhesive layer of the polarizing film with an adhesive layer is bonded.

[0020] The present invention also relates to an image display device characterized by having the aforementioned image display panel. [Effects of the Invention]

[0021] The polarizing film with an adhesive layer of the present invention has a conductive layer between the adhesive layer and the polarizing film, and the adhesive layer contains an ionic compound, so that the antistatic performance can be improved by both the conductive layer and the adhesive layer.Therefore, even if the amount of ionic compound in the adhesive layer is reduced, the antistatic function of both layers can suppress static electricity unevenness even when the polarizing film with an 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 irregular shapes other than rectangles, as described above, the amount of ionic compound in the adhesive layer can be reduced so that the occurrence of irregular cracks can be suppressed.

[0022] Furthermore, it was found that the smaller the molecular weight of the cationic component of the ionic compound, the less adverse effect it has on irregular crack formation. In particular, it was found that using a lithium salt as the cationic component of the ionic compound exhibits excellent suppression of irregular crack formation. Moreover, it was found that this suppression of irregular crack formation is advantageous when using a single-protection polarizing film, which has a protective film on only one side of the polarizer, as the polarizing film. Single-protection polarizing films are also advantageous from the viewpoint of thinning and cost reduction. It was also found that the smaller the molecular weight of the cationic component, the more preferable it is in terms of suppressing electrostatic unevenness.

[0023] On the other hand, when a single protective polarizing film is used as the polarizing film as described above, the conductive layer is formed directly on the polarizer. Therefore, in a humid environment, the antistatic agent of the conductive layer penetrates into the polarizer, causing the edges of the polarizer to decolorize. Furthermore, the segregation of ionic compounds contained in the adhesive layer onto the polarizer may reduce the antistatic function of the adhesive layer. Thus, when using a single protective polarizing film, by providing the conductive layer on the polarizer via a transparent layer, the conductive layer does not directly affect the polarizer, thereby suppressing the decolorization of the edges of the polarizer in a humid environment.

[0024] As described above, the adhesive-coated polarizing film of the present invention can suppress the deterioration of the optical reliability of the polarizer even when a single protective polarizing film is used, and can provide an adhesive-coated polarizing film that is thin, has good optical reliability, and exhibits excellent antistatic properties over a long period of time. [Brief explanation of the drawing]

[0025] [Figure 1] This is a cross-sectional view showing an example of a polarizing film with an adhesive layer according to the present invention. [Figure 2] This is a cross-sectional view showing an example of a polarizing film with an adhesive layer according to the present invention. [Figure 3] This is a cross-sectional view showing an example of a polarizing film with an adhesive layer according to the present invention. [Figure 4] This is a top view showing an example of a non-rectangular irregular shape of the adhesive-layered polarizing film of the present invention. [Figure 5] This is a top view showing a polarizing film with an adhesive layer having an irregular shape according to an embodiment of the present invention. [Figure 6] This is a cross-sectional view showing an example of a liquid crystal panel with touch sensing function using the adhesive layer polarizing film of the present invention. [Figure 7] This is a cross-sectional view showing an example of a liquid crystal panel with touch sensing function using the adhesive layer polarizing film of the present invention. [Figure 8] This is a cross-sectional view showing an example of a liquid crystal panel with touch sensing function using the adhesive layer polarizing film of the present invention. [Modes for carrying out the invention]

[0026] The adhesive-layered polarizing film of the present invention is shown, for example, in Figure 1. As shown in Figure 1, the adhesive-layered polarizing film 1 has a polarizing film 11, a conductive layer c, and an adhesive layer 21 in that order. Figure 2 shows a case where a single-protection polarizing film 11A is used as the polarizing film 11 of Figure 1, having a protective film b on only one side of the polarizer a. In the single-protection polarizing film 11A, the adhesive layer 21 is provided on the other side of the polarizer a that does not have the protective film b, via the conductive layer c. Although not shown, a single-protection polarizing film A2 can also be used, having a protective film b on only one side of the polarizer a, with a laminate in the order of polarizer a / protective film b / conductive layer c / adhesive layer 21. Figure 3 shows a case where, in addition to the single-protection polarizing film 11A, a transparent layer d is provided on the other side of the polarizer a. In Figure 3, the single-protection polarizing film 11A has a transparent layer d, a conductive layer c, and an adhesive layer 21 in that order. The transparent layer d is preferably provided directly on the polarizer a because it can suppress the increase in the moisture content of the polarizer in high-temperature, high-humidity environments.

[0027] <Unusual part> Furthermore, the adhesive-coated polarizing film of the present invention has irregular shapes other than rectangles. Figure 4 is a top view of an example of a film having irregular shapes other than rectangles. The irregular shape is not particularly limited and can take any shape depending on the application, function, and design of the adhesive-coated polarizing film. An example of an irregular shape other than a rectangle is a rectangle with a notch or through hole.

[0028] The notches are provided on the outer edge of the polarizing film with an adhesive layer. If multiple notches are provided, they may be the same shape or different shapes. Two or more notches may be provided on one side, or one or more notches may be provided on each of two sides. Furthermore, the notches may be provided at one of the four corners of the outer edge of the rectangle, or at two or more corners. The corners of the outer edge where no notches are provided may be angular or rounded. The notches can be made up of straight lines, curves, or a combination thereof. Figure 4 is an example of a polarizing film 1 with an adhesive layer having an irregular shape, in which notches 2 of different shapes are provided on both short sides of the rectangle.

[0029] The length of the edge W1 of the cut portion is adjusted as appropriate depending on the application of the polarizing film. For example, it is preferable to adjust W1 to a range of about 2 to 100 mm. Furthermore, it is preferable to adjust the maximum depth D of the cut portion 2 from edge W1 to about 2 to 100 mm.

[0030] Figure 4 shows the case where the angle θ1 between the two straight lines that constitute the shape of the missing portion 2 is 90°. However, the angle θ1 is 90° or more and less than 180°, preferably 90° or more and 135° or less. If the angle θ1 is outside the above range, under harsh thermal shock conditions, stress due to expansion and contraction will concentrate in the portion 4 where the two straight lines intersect, making it easier for cracks to form in that portion 4.

[0031] Furthermore, Figure 4 shows the curve that constitutes the shape of the missing portion 2, and the radius of curvature R1 of this curve is 0.2 mm or more, preferably 1 mm or more, more preferably 2 mm or more, even more preferably 3 mm or more, and even more preferably 5 mm or more. If the radius of curvature R1 is less than 0.2 mm, under harsh thermal shock conditions, stress due to expansion and contraction will concentrate in the curved portion, making it prone to cracking in that curved portion.

[0032] The through-holes are provided within the planar interior of the polarizing film with an adhesive layer. When multiple through-holes are provided within the planar interior of the polarizing film with an adhesive layer, they may be the same shape or different shapes. The through-holes are composed of straight lines, curves, or combinations thereof. Examples of the shapes of the through-holes include circles, ellipses (with one axis of symmetry, with two axes of symmetry), rounded rectangles, quadrilaterals (squares, rectangles), and polygons with five or more sides.

[0033] Methods for forming the aforementioned irregular shape include, for example, punching, end milling, and laser processing. The irregular shape is usually formed by these processes after each layer has been laminated.

[0034] <Adhesive-coated polarizing film> First, the components constituting the adhesive layer polarizing film of the present invention will be described. The polarizing film used is one having a polarizer and a protective film on one or both sides of the polarizer.

[0035] The polarizer is not particularly limited, and various types can be used. Examples of polarizers include hydrophilic polymer films such as polyvinyl alcohol-based films, partially formalized polyvinyl alcohol-based films, and partially saponified ethylene-vinyl acetate copolymer films, which are uniaxially stretched after adsorbing dichroic substances such as iodine or dichroic dyes; and polyene-based oriented films such as dehydrated polyvinyl alcohol or dehydrochlorinated polyvinyl chloride. Among these, polarizers made of polyvinyl alcohol-based films and dichroic substances such as iodine are preferred. The thickness of these polarizers is not particularly limited, but is generally about 80 μm or less.

[0036] Furthermore, thin polarizers with a thickness of 10 μm or less can be used as polarizers. From the standpoint of thinning, a thickness of 1 to 7 μm is preferable. Such thin polarizers are preferable because they have little thickness variation, excellent visibility, excellent durability due to little dimensional change, and furthermore, the thickness of the polarizing film can be reduced.

[0037] The protective film is made of materials such as thermoplastic resins that have excellent transparency, mechanical strength, thermal stability, moisture barrier properties, and isotropy. Specific examples of such thermoplastic resins include cellulose resins such as triacetylcellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, cyclic polyolefin resins (norbornene-based resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. On one side of the polarizer, the protective film is usually bonded with an adhesive layer, while on the other side, thermosetting resins such as (meth)acrylic, urethane, acrylic urethane, epoxy, and silicone resins, or UV-curable resins, can be used as the protective film.

[0038] As the material for the protective film (transparent protective film), cellulose resin and (meth)acrylic resin are preferred because they can control the fluctuation in the surface resistance value of the adhesive layer to a small extent. Furthermore, it is preferable to use a (meth)acrylic resin having a lactone ring structure. Examples of (meth)acrylic resins having a lactone ring structure include those described in Japanese Patent Publication No. 2000-230016, 2001-151814, 2002-120326, 2002-254544, and 2005-146084. In particular, cellulose resin is preferred over (meth)acrylic resin because it is more effective in suppressing irregular cracks and polarizer cracks, which are problematic in single-sided protective polarizing films.

[0039] As the protective film, phase difference films, brightness enhancement films, diffusion films, etc., can also be used. Examples of phase difference films include those having a front phase difference of 40 nm or more and / or a thickness direction phase difference of 80 nm or more. The front phase difference is usually controlled in the range of 40 to 200 nm, and the thickness direction phase difference is usually controlled in the range of 80 to 300 nm. When a phase difference film is used as a protective film, the phase difference film also functions as a polarizer protective film, so it is possible to make it thinner.

[0040] Functional layers such as a hard coat layer, anti-reflective layer, anti-sticking layer, diffusion layer, or anti-glare layer can be provided on the surface of the protective film to which the polarizer is not attached.

[0041] The protective film and the polarizer are laminated with an intervening layer such as an adhesive layer, a tack layer, or a primer layer. In this case, it is desirable that the intervening layer laminates the two without any air gaps. It is preferable that the protective film and the polarizer are laminated with an adhesive layer. The adhesive used to bond the polarizer and the protective film is not particularly limited as long as it is optically transparent, and various forms such as water-based, solvent-based, hot-melt, radical-curing, and cationic-curing adhesives can be used, but water-based adhesives or radical-curing adhesives are preferred.

[0042] <Conductive layer> The thickness of the conductive layer c is preferably 1 μm or less, preferably 0.01 to 0.5 μm, preferably 0.01 to 0.2 μm, and more preferably 0.01 to 0.1 μm, from the viewpoint of surface resistance stability and adhesion with the adhesive layer 21. Furthermore, the surface resistance of the conductive layer c is preferably 1 × 10⁻¹⁶ from the viewpoint of antistatic function. 7 ~1 × 10 12 It is preferable that Ω / □, and 1 × 10 7 ~1 × 10 11 It is preferable that the ratio is Ω / □, and furthermore, 1 × 10 7 ~1 × 10 10 It is preferable that the ratio is Ω / □.

[0043] The conductive layer can be formed from various antistatic agent compositions. Examples of antistatic agents that can be used to form the conductive layer include ionic surfactants, conductive polymers, conductive fine particles, and carbon nanotubes.

[0044] Among these antistatic agents, conductive polymers and carbon nanotubes are preferred in terms of optical properties, appearance, antistatic effect, and the stability of the antistatic effect under heat and humidity. In particular, conductive polymers such as polyaniline and polythiophene are preferred. Conductive polymers that are soluble in organic solvents, water-soluble, or water-dispersible can be used as appropriate, but water-soluble conductive polymers or water-dispersible conductive polymers are preferred. This is because water-soluble conductive polymers and water-dispersible conductive polymers allow the coating solution for forming the antistatic layer to be prepared as an aqueous solution or water dispersion, eliminating the need for non-aqueous organic solvents in the coating solution, and thus suppressing deterioration of the optical film substrate due to such organic solvents. Note that the aqueous solution or water dispersion may contain water-based solvents in addition to water. Examples of alcohols include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-amyl alcohol, isoamyl alcohol, sec-amyl alcohol, tert-amyl alcohol, 1-ethyl-1-propanol, 2-methyl-1-butanol, n-hexanol, and cyclohexanol.

[0045] Furthermore, it is preferable that the water-soluble conductive polymer or water-dispersible conductive polymer, such as polyaniline or polythiophene, has hydrophilic functional groups in its molecule. Examples of hydrophilic functional groups include sulfone groups, amino groups, amide groups, imino groups, quaternary ammonium bases, hydroxyl groups, mercapto groups, hydrazino groups, carboxyl groups, sulfate ester groups, phosphate ester groups, or salts thereof. Having hydrophilic functional groups in the molecule makes it easier to dissolve in water or disperse in water as fine particles, allowing the water-soluble conductive polymer or water-dispersible conductive polymer to be easily prepared.

[0046] Examples of commercially available water-soluble conductive polymers include polyaniline sulfonic acid (manufactured by Mitsubishi Rayon Co., Ltd., weight average molecular weight 150,000 in terms of polystyrene), etc. Examples of commercially available water-dispersible conductive polymers include polythiophene-based conductive polymers (manufactured by Nagase ChemteX Corporation, trade name, Denatron series), etc.

[0047] In addition, as a material for forming the conductive layer, a binder component can also be added together with the antistatic agent for the purpose of improving the film-forming property of the antistatic agent, the adhesion to the optical film, etc. When the antistatic agent is an aqueous material of a water-soluble conductive polymer or a water-dispersible conductive polymer, a water-soluble or water-dispersible binder component is used. Examples of the binder include oxazoline group-containing polymers, polyurethane-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, etc. Particularly, polyurethane-based resins, polyester-based resins, and acrylic-based resins are preferable. These binders can be used singly or in combination of two or more appropriately according to their uses.

[0048] The amounts of the antistatic agent and the binder used depend on their types, but it is preferable to control so that the surface resistance value of the obtained conductive layer becomes 1×10 7 ~1×10 12 Ω / □.

[0049] <Adhesive layer> The adhesive layer is formed from an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B).

[0050] The (meth)acrylic polymer (A) contains an alkyl (meth)acrylate as a main component as a monomer unit. Here, (meth)acrylate means acrylate and / or methacrylate, and (meth) in the present invention has the same meaning.

[0051] Examples of alkyl (meth)acrylates constituting the main skeleton of (meth)acrylic polymer (A) include linear or branched alkyl groups having 1 to 18 carbon atoms. For example, examples of the alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, amyl, hexyl, cyclohexyl, heptyl, 2-ethylhexyl, isooctyl, nonyl, decyl, isodecyl, dodecyl, isomyristyl, lauryl, tridecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, etc. These can be used individually or in combination. The average number of carbon atoms of these alkyl groups is preferably 3 to 9.

[0052] The weight ratio of the alkyl (meth)acrylate is preferably 70% by weight or more in terms of monomer units, relative to the total weight ratio (100% by weight) of all constituent monomers that make up the (meth)acrylic polymer (A). The weight ratio of the alkyl (meth)acrylate can be considered as the remainder of the other copolymer monomers. Setting the weight ratio of the alkyl (meth)acrylate within the above range is preferable for ensuring adhesion.

[0053] In addition to the alkyl (meth)acrylate monomer units, one or more copolymer monomers having polymerizable functional groups with unsaturated double bonds, such as (meth)acryloyl groups or vinyl groups, can be introduced into the (meth)acrylic polymer (A) by copolymerization for the purpose of improving adhesion and heat resistance.

[0054] Examples of the copolymer monomers include functional group-containing monomers such as carboxyl group-containing monomers, hydroxyl group-containing monomers, and amide group-containing monomers.

[0055] Carboxyl group-containing monomers are compounds that contain a carboxyl group in their structure and also contain polymerizable unsaturated double bonds such as (meth)acryloyl groups and vinyl groups. Specific examples of carboxyl group-containing monomers include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. Among the carboxyl group-containing monomers, acrylic acid is preferred from the viewpoint of copolymerizability, cost, and adhesive properties.

[0056] Hydroxyl group-containing monomers are compounds that contain a hydroxyl group in their structure and also contain polymerizable unsaturated double bonds such as (meth)acryloyl groups and vinyl groups. Specific examples of hydroxyl group-containing monomers include hydroxyalkyl (meth)acrylates and (4-hydroxymethylcyclohexyl)-methyl acrylates such as 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, and 12-hydroxylauryl (meth)acrylate. Among the hydroxyl group-containing monomers, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred from the viewpoint of durability, and 4-hydroxybutyl (meth)acrylate is particularly preferred.

[0057] Carboxyl group-containing monomers and hydroxyl group-containing monomers act as reaction sites with crosslinking agents when the adhesive composition contains a crosslinking agent. Because carboxyl group-containing monomers and hydroxyl group-containing monomers are highly reactive with intermolecular crosslinking agents, they are preferably used to improve the cohesiveness and heat resistance of the resulting adhesive layer. Furthermore, carboxyl group-containing monomers are preferred in terms of achieving both durability and reworkability, while hydroxyl group-containing monomers are preferred in terms of reworkability.

[0058] The weight ratio of the carboxyl group-containing monomer is preferably 10% by weight or less, more preferably 0.01 to 8% by weight, more preferably 0.05 to 6% by weight, and more preferably 0.1 to 5% by weight. A weight ratio of 0.01% by weight or more of the carboxyl group-containing monomer is preferable in terms of durability. On the other hand, a weight ratio exceeding 10% by weight is undesirable in terms of reworkability.

[0059] The weight ratio of the hydroxyl group-containing monomer is preferably 3% by weight or less, more preferably 0.01 to 3% by weight, more preferably 0.1 to 2% by weight, and more preferably 0.2 to 2% by weight. A weight ratio of 0.01% by weight or more of the hydroxyl group-containing monomer is preferable from the viewpoint of crosslinking the adhesive layer, durability, and adhesive properties. On the other hand, a weight ratio exceeding 3% by weight is undesirable from the viewpoint of durability.

[0060] Amide group-containing monomers are compounds that contain an amide group in their structure and also contain polymerizable unsaturated double bonds such as (meth)acryloyl groups and vinyl groups. Specific examples of amide group-containing monomers include acrylamide monomers such as (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(meth)acrylamide, N-butyl(meth)acrylamide, N-hexyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methylol-N-propane(meth)acrylamide, aminomethyl(meth)acrylamide, aminoethyl(meth)acrylamide, mercaptomethyl(meth)acrylamide, and mercaptoethyl(meth)acrylamide; N-acryloyl heterocyclic monomers such as N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, and N-(meth)acryloylpyrrolidine; and N-vinyl group-containing lactam monomers such as N-vinylpyrrolidone and N-vinyl-ε-caprolactam. Amide group-containing monomers are preferred for suppressing the increase in surface resistance over time (especially in humid environments), satisfying durability requirements, and further for suppressing irregular cracks. In particular, among amide group-containing monomers, N-vinyl group-containing lactam monomers are preferred for suppressing the increase in surface resistance over time (especially in humid environments), satisfying durability requirements for the transparent conductive layer (touch sensor layer), and suppressing irregular cracks.

[0061] As the weight ratio of the amide group-containing monomer increases, the anchoring ability to the optical film tends to decrease; therefore, the weight ratio is preferably 10% by weight or less, and more preferably 5% by weight or less. From the viewpoint of suppressing the increase in surface resistance over time (especially in humid environments), the weight ratio of the amide group-containing monomer is preferably 0.1% by weight or more. 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 suitable in relation to the ionic compound (B) contained in the adhesive layer of the present invention.

[0062] In the adhesive composition used to form the adhesive layer, if an amide group is introduced into the side chain of the base polymer, the (meth)acrylic polymer (A), the presence of the amide group is preferable in that it suppresses fluctuations and increases in the surface resistance value of the adhesive layer adjusted by the addition of the ionic compound (B), even in a humid environment, and helps maintain it within a desired range. It is believed that the presence of an amide group introduced as a functional group of the copolymer monomer into the side chain of the (meth)acrylic polymer (A) increases the compatibility between the (meth)acrylic polymer (A) and the ionic compound (B).

[0063] Furthermore, the adhesive layer exhibits good durability against both glass and transparent conductive layers (such as ITO layers) when amide groups are introduced into the side chains of the base polymer (meth)acrylic polymer (A), and can suppress peeling and lifting when attached to a liquid crystal panel. It also maintains satisfactory durability even under humid conditions (after humidification reliability testing).

[0064] As copolymer monomers, for example, aromatic ring-containing (meth)acrylates can be used. Aromatic ring-containing (meth)acrylates are compounds that contain an aromatic ring structure and a (meth)acryloyl group in their structure. Examples of aromatic rings include benzene rings, naphthalene rings, or biphenyl rings.

[0065] Specific examples of aromatic ring-containing (meth)acrylates include, for example, benzyl (meth)acrylate, phenyl (meth)acrylate, o-phenylphenol (meth)acrylate, phenoxy (meth)acrylate, phenoxyethyl (meth)acrylate, phenoxypropyl (meth)acrylate, phenoxydiethylene glycol (meth)acrylate, ethylene oxide-modified nonylphenol (meth)acrylate, ethylene oxide-modified cresol (meth)acrylate, phenol ethylene oxide-modified (meth)acrylate, and 2-Hydro Examples include those having a benzene ring, such as roxy-3-phenoxypropyl (meth)acrylate, methoxybenzyl (meth)acrylate, chlorobenzyl (meth)acrylate, cresyl (meth)acrylate, and polystyryl (meth)acrylate; those having a naphthalene ring, such as hydroxyethylated β-naphthol acrylate, 2-naphthoethyl (meth)acrylate, 2-naphthoxyethyl acrylate, and 2-(4-methoxy-1-naphthoxy)ethyl (meth)acrylate; and those having a biphenyl ring, such as biphenyl (meth)acrylate.

[0066] As the aromatic ring-containing (meth)acrylate, benzyl (meth)acrylate and phenoxyethyl (meth)acrylate are preferred from the viewpoint of adhesive properties and durability, and phenoxyethyl (meth)acrylate is particularly preferred.

[0067] The weight ratio of the aromatic ring-containing (meth)acrylate is preferably 25% by weight or less, more preferably 3 to 25% by weight, more preferably 10 to 22% by weight, and more preferably 14 to 20% by weight. When the weight ratio of the aromatic ring-containing (meth)acrylate is 3% by weight or more, it is preferable for suppressing unevenness in the display. On the other hand, if it exceeds 25% by weight, the suppression of unevenness in the display is not sufficient, and durability tends to decrease.

[0068] Other specific examples of copolymer monomers not mentioned above include: acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; sulfonic acid group-containing monomers such as allyl sulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, (meth)acrylamidepropanesulfonic acid, and sulfopropyl (meth)acrylate; and phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate.

[0069] Furthermore, alkylaminoalkyl(meth)acrylates such as aminoethyl(meth)acrylate, N,N-dimethylaminoethyl(meth)acrylate, and t-butylaminoethyl(meth)acrylate; alkoxyalkyl(meth)acrylates such as methoxyethyl(meth)acrylate and ethoxyethyl(meth)acrylate; N-(meth)acryloyloxymethylenesuccinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, and N-(meth)acryloyl-8-oxyocta Examples of monomers used for modification include succinimide monomers such as methylenesuccinimide; maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, and N-phenylmaleimide; and itaconimide monomers such as N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N-octylitaconimide, N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, and N-laurylitaconimide.

[0070] Furthermore, other modified monomers that can be used include vinyl monomers such as vinyl acetate and vinyl propionate; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing (meth)acrylates such as glycidyl (meth)acrylate; glycol-based (meth)acrylates such as polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, and methoxypolypropylene glycol (meth)acrylate; and (meth)acrylate monomers such as tetrahydrofurfuryl (meth)acrylate, fluorine (meth)acrylate, silicone (meth)acrylate, and 2-methoxyethyl acrylate. In addition, isoprene, butadiene, isobutylene, and vinyl ethers can also be used.

[0071] Furthermore, other copolymerizable monomers besides those mentioned above include silane monomers containing silicon atoms. Examples of silane monomers include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, and 10-acryloyloxydecyltriethoxysilane.

[0072] Furthermore, the copolymer monomers include tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, bisphenol A diglycidyl ether di(meth)acrylate, neopentyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, and dipentaerythritol. Polyfunctional monomers having two or more unsaturated double bonds such as (meth)acryloyl groups and vinyl groups, such as esters of (meth)acrylic acid and polyhydric alcohols, including hexa(meth)acrylate and caprolactone-modified dipentaerythritol hexa(meth)acrylate, can also be used. Polyester (meth)acrylate, epoxy (meth)acrylate, urethane (meth)acrylate, etc., which have two or more unsaturated double bonds such as (meth)acryloyl groups and vinyl groups added to the backbone of polyester, epoxy, urethane, etc., as functional groups similar to those of the monomer component, can also be used.

[0073] The proportion of the other copolymer monomers in the (meth)acrylic polymer (A) is preferably about 0 to 10% by weight, more preferably about 0 to 7% by weight, and more preferably about 0 to 5% by weight, in terms of the weight ratio of all constituent monomers (100% by weight) of the (meth)acrylic polymer (A).

[0074] The (meth)acrylic polymer (A) of the present invention preferably has a weight-average molecular weight of 1 million to 2.5 million. Considering durability, particularly heat resistance, a weight-average molecular weight of 1.2 million to 2 million is preferable. A weight-average molecular weight of 1 million or more is preferable in terms of heat resistance. Furthermore, if the weight-average molecular weight exceeds 2.5 million, the adhesive tends to harden, making peeling more likely. The weight-average molecular weight (Mw) / number-average molecular weight (Mn), which indicates the molecular weight distribution, is preferably between 1.8 and 10, more preferably between 1.8 and 7, and more preferably between 1.8 and 5. A molecular weight distribution (Mw / Mn) exceeding 10 is undesirable in terms of durability. The weight-average molecular weight and molecular weight distribution (Mw / Mn) are determined from values ​​calculated by GPC (gel permeation chromatography) and converted to polystyrene equivalent.

[0075] Such (meth)acrylic polymers (A) can be produced using known methods such as solution polymerization, bulk polymerization, emulsion polymerization, and various radical polymerizations, which can be appropriately selected. Furthermore, the resulting (meth)acrylic polymer (A) may be a random copolymer, block copolymer, graft copolymer, or any other form.

[0076] In solution polymerization, for example, ethyl acetate and toluene are used as polymerization solvents. A typical example of solution polymerization involves adding a polymerization initiator under a stream of an inert gas such as nitrogen, and the reaction is usually carried out at around 50-70°C for 5-30 hours.

[0077] The polymerization initiators, chain transfer agents, emulsifiers, etc. used in radical polymerization are not particularly limited and can be selected and used as appropriate. The weight-average molecular weight of the (meth)acrylic polymer (A) can be controlled by the amount of polymerization initiator and chain transfer agent used and the reaction conditions, and the appropriate amounts used are adjusted according to the type of agent.

[0078] <Ionic compound (B)> The ionic compound (B) contained in the adhesive composition forming the adhesive layer of the present invention can preferably be an alkali metal salt and / or an organic cation-anion salt. The alkali metal salt can be an organic salt or an inorganic salt of an alkali metal. In this invention, "organic cation-anion salt" refers to an organic salt in which the cation component is composed of an organic substance, and the anion component may be an organic substance or an inorganic substance. "Organic cation-anion salt" is also called an ionic liquid or an ionic solid. By containing the ionic compound (B) in the adhesive layer, the surface resistance of the adhesive layer can be reduced, thereby suppressing the generation of static electricity and preventing the orientation of the liquid crystal layer from being disturbed by charging, which can cause light leakage (uneven charging).

[0079] <Alkali metal salts> Examples of alkali metal ions that constitute the cation component of alkali metal salts include lithium, sodium, and potassium ions. Among these alkali metal ions, lithium ions are preferred.

[0080] The anionic component of an alkali metal salt may be composed of organic or inorganic substances. An example of an anionic component of an organic salt is CH3COO - CF3COO - CH3SO3 - CF3SO3 - (CF3SO2)3C - , C4F9SO3 - C3F7COO - (CF3SO2)(CF3CO)N - , - O3S(CF2)3SO3 - PF6 - CO3 2- , or the following general formulas (1) to (4), (1):(C n F 2n+1 SO2)2N - (where n is an integer between 0 and 10) (2):CF2(C m F 2mSO2)2N - (where m is an integer between 1 and 10) (3): - O3S(CF2) l SO3 - (where l is an integer between 1 and 10) (4):(C p F 2p+1 SO2)N - (C q F 2q+1 Examples of compounds represented by SO2, where p and q are integers from 1 to 10, are used. In particular, anionic components containing fluorine atoms are preferred because they yield ionic compounds with good ionic dissociation properties. Examples of anionic components constituting inorganic salts include Cl - , Br - , I - AlCl4 - Al2Cl7 - BF4 - PF6 - ClO4 - NO3 - AsF6 - SbF6 - , NbF6 - TaF6 - , (CN)2N - , etc. are used. As for the anionic component, (CF3SO2)2N - (C2F5SO2)2N - (Perfluoroalkylsulfonyl)imides represented by the above general formula (1), such as (CF3SO2)2N, are preferred, and (CF3SO2)2N is particularly preferred. - (Trifluoromethanesulfonyl)imides represented as are preferred.

[0081] Examples of alkali metal organic salts include sodium acetate, sodium alginate, sodium ligninsulfonate, 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. Of these, LiCF3SO3, Li(CF3SO2)2N, Li(C2F5SO2)2N, Li(C4F9SO2)2N, Li(CF3SO2)3C, etc. are preferred, fluorine-containing lithium imide salts such as Li(CF3SO2)2N, Li(C2F5SO2)2N, Li(C4F9SO2)2N, etc. are more preferred, and (perfluoroalkylsulfonyl)imide lithium salts are particularly preferred. Other examples include 4,4,5,5-tetrafluoro-1,3,2-dithiazolidined-1,1,3,3-tetraoxide lithium salt.

[0082] In addition, examples of inorganic salts of alkali metals include lithium perchlorate and lithium iodide.

[0083] <Organic cation-anionic salts> The organic cation-anion salt used in the present invention is composed of a cation component and an anion component, wherein the cation component is an organic substance. Specifically, examples of cation components include pyridinium cation, piperidinium cation, pyrrolidinium cation, cation having a pyrroline skeleton, cation having a pyrrole skeleton, imidazolium cation, tetrahydropyrimidinium cation, dihydropyrimidinium cation, pyrazolium cation, pyrazolinium cation, tetraalkylammonium cation, trialkylsulfonium cation, and tetraalkylphosphonium cation.

[0084] Examples of anionic components include 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 the following general formulas (1) to (4), (1): (C n F 2n+1 SO2)2N - (where n is an integer from 0 to 10), (2): CF2(C m F 2m SO2)2N - (where m is an integer from 1 to 10), (3): - O3S(CF2) l SO3 - (where l is an integer from 1 to 10), (4): (C p F 2p+1 SO2)N - (C q F 2q+1 SO2), (where p and q are integers from 1 to 10), etc. are used. Among them, in particular, an anion component containing a fluorine atom is preferably used because an ionic compound with good ionic dissociation can be obtained.

[0085] The organic cation-anionic salt is a compound consisting of the above-mentioned combination of cationic and anionic components, which is appropriately selected and used. Preferred specific examples of organic cation-anionic salts include, for example, methyltrioctylammonium bis(trifluoromethanesulfonyl)imide, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, and ethylmethylimidazolium bis(fluorosulfonylimide). Among these, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide and ethylmethylimidazolium bis(fluorosulfonylimide) are more preferred.

[0086] In addition to the alkali metal salts and organic cation-anion salts mentioned above, other examples of ionic compounds (B) include inorganic salts such as ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride, and ammonium sulfate.

[0087] The ionic compound (B) is preferably one in which the molecular weight of the cationic component is 210 or less, from the viewpoint of suppressing the occurrence of irregular cracks. The molecular weight of the cationic component is more preferably 150 or less, more preferably 110 or less, more preferably 50 or less, and more preferably 10 or less. The larger the molecular weight of the cationic component, the more it inhibits the entanglement of (meth)acrylic polymers in the adhesive layer, and the more the physical properties of the adhesive layer tend to become softer. Therefore, the smaller the molecular weight, the less the physical properties of the adhesive layer tend to become softer, and the occurrence of irregular cracks can be suppressed. Furthermore, the smaller the molecular weight of the cationic component, the more the surface resistance value of the adhesive layer tends to decrease, which is also preferable in terms of suppressing electrostatic unevenness.

[0088] When the ionic compound (B) is an alkali metal salt, alkali metal ions such as lithium, sodium, and potassium are cation components with a molecular weight of 210 or less. Therefore, alkali metal salts having these alkali metal ions as cation components can be preferably used. In particular, from the viewpoint of compatibility with the adhesive layer, an organic salt of an alkali metal in which the anion component of the alkali metal salt is composed of an organic substance is preferable. Further, as the alkali metal ion, lithium ion having the smallest molecular weight is preferable. As the ionic compound (B), a lithium salt is preferable, and an organic salt of lithium is particularly preferable. On the other hand, when the ionic compound (B) is an organic cation-anion salt, it can be used by selecting a molecular weight of 210 or less from the exemplified cation components. In particular, from the viewpoint of compatibility with the adhesive layer, an organic cation-anion salt in which the anion component is composed of an organic substance is preferable.

[0089] The ratio of the ionic compound (B) in the adhesive composition of the present invention can be appropriately adjusted so as to satisfy the antistatic property of the adhesive layer and the sensitivity of the touch panel. For example, considering the type of the protective film of the polarizing film and the like, the ratio of the ionic compound (B) is preferably adjusted according to the type of the liquid crystal panel having a built-in touch sensing function so that the surface resistance value of the adhesive layer is in the range of 1.0×10 8 ~1.0×10 12 Ω / □. For example, in the in-cell type liquid crystal panel having a built-in touch sensing function shown in FIG. 6, the adhesive layer preferably has an initial surface resistance value controlled in the range of 1×10 8 ~1×10 12 Ω / □, and more preferably in the range of 1×10 8 ~1×10 10 Ω / □. Further, in the semi-in-cell type shown in FIG. 7 or the on-cell type liquid crystal panel having a built-in touch sensing function shown in FIG. 8, the adhesive layer preferably has an initial surface resistance value controlled in the range of 1×10 10 ~1×10 12 Ω / □.

[0090] If the amount of the ionic compound (B) is too high, there is a possibility that the ionic compound (B) may precipitate, and furthermore, humidification-induced peeling may occur. Also, if the amount of the ionic compound (B) is too high, the surface resistance value may become too low, and baseline fluctuations (malfunctions during touch caused by excessively low surface resistance value) may reduce the sensitivity of the touch panel. The proportion of the ionic compound (B) is preferably, for example, 40 parts by weight or less, more preferably 20 parts by weight or less, more preferably 10 parts by weight or less, and more preferably 6 parts by weight or less, per 100 parts by weight of the (meth)acrylic polymer (A). If it is too low, the antistatic properties will be poor, and if it is too high, there is a risk of reduced touch sensitivity, precipitation of the ionic compound, and worsening of humidification-induced peeling of the adhesive. On the other hand, in order to improve the antistatic performance, it is preferable to use 0.01 parts by weight or more of the ionic compound (B). From this viewpoint, the ionic compound (B) is preferably 0.1 parts by weight or more, and more preferably 0.5 parts by weight or more.

[0091] The adhesive composition of the present invention may contain a crosslinking agent (C). As the crosslinking agent (C), organic crosslinking agents or polyfunctional metal chelates can be used. Examples of organic crosslinking agents include isocyanate-based crosslinking agents, peroxide-based crosslinking agents, epoxy-based crosslinking agents, and imine-based crosslinking agents. A polyfunctional metal chelate is one in which a polyvalent metal is covalently or coordinately bonded to an organic compound. Examples of polyvalent metal atoms include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, and Ti. Examples of atoms in the organic compound that form covalent or coordinate bonds include oxygen atoms, and examples of organic compounds include alkyl esters, alcohol compounds, carboxylic acid compounds, ether compounds, and ketone compounds.

[0092] As the crosslinking agent (C), isocyanate-based crosslinking agents and / or peroxide-based crosslinking agents are preferred.

[0093] As the isocyanate crosslinking agent (C), a compound having at least two isocyanate groups can be used. For example, known aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates, etc., which are generally used in urethane reactions, can be used.

[0094] Any peroxide that generates radical active species upon heating or light irradiation to promote crosslinking of the base polymer of the adhesive composition can be used as appropriate. However, considering workability and stability, it is preferable to use a peroxide with a 1-minute half-life temperature of 80°C to 160°C, and more preferably a peroxide with a half-life temperature of 90°C to 140°C.

[0095] Examples of peroxides that can be used include di(2-ethylhexyl) peroxydicarbonate (half-life temperature at 1 minute: 90.6°C), di(4-t-butylcyclohexyl) peroxydicarbonate (half-life temperature at 1 minute: 92.1°C), di-sec-butyl peroxydicarbonate (half-life temperature at 1 minute: 92.4°C), t-butyl peroxyneodecanoate (half-life temperature at 1 minute: 103.5°C), t-hexyl peroxypivalate (half-life temperature at 1 minute: 109.1°C), t-butyl peroxypivalate (half-life temperature at 1 minute: 110.3°C), and dilauroyl peroxy Examples include oxides (half-life temperature at 1 minute: 116.4°C), di-n-octanoyl peroxide (half-life temperature at 1 minute: 117.4°C), 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate (half-life temperature at 1 minute: 124.3°C), di(4-methylbenzoyl)peroxide (half-life temperature at 1 minute: 128.2°C), dibenzoyl peroxide (half-life temperature at 1 minute: 130.0°C), t-butylperoxyisobutyrate (half-life temperature at 1 minute: 136.1°C), and 1,1-di(t-hexylperoxy)cyclohexane (half-life temperature at 1 minute: 149.2°C). Among these, di(4-t-butylcyclohexyl)peroxydicarbonate (half-life temperature at 1 minute: 92.1°C), dilauroyl peroxide (half-life temperature at 1 minute: 116.4°C), and dibenzoyl peroxide (half-life temperature at 1 minute: 130.0°C) are preferred due to their excellent cross-linking reaction efficiency.

[0096] The amount of crosslinking agent (C) used is preferably 3 parts by weight or less, more preferably 0.01 to 3 parts by weight, more preferably 0.02 to 2 parts by weight, and more preferably 0.03 to 1 part by weight, per 100 parts by weight of (meth)acrylic polymer (A). If the amount of crosslinking agent (C) is less than 0.01 parts by weight, the adhesive layer may not be sufficiently crosslinked, and the durability and adhesive properties may not be satisfactory. On the other hand, if the amount is more than 3 parts by weight, the adhesive layer tends to become too hard, and the durability tends to decrease.

[0097] 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. Examples of silane coupling agents include epoxy group-containing silane coupling agents such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; amino group-containing silane coupling agents such as 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethylbutylidene)propylamine, and N-phenyl-γ-aminopropyltrimethoxysilane; (meth)acrylic group-containing silane coupling agents such as 3-acryloxypropyltrimethoxysilane and 3-methacryloxypropyltriethoxysilane; and isocyanate group-containing silane coupling agents such as 3-isocyanatetopropyltriethoxysilane. Among the exemplified silane coupling agents, epoxy group-containing silane coupling agents are preferred.

[0098] Furthermore, a silane coupling agent (D) having multiple alkoxysilyl groups in its molecule can also be used. Specifically, examples include Shin-Etsu Chemical's X-41-1053, X-41-1059A, X-41-1056, X-41-1805, X-41-1818, X-41-1810, and X-40-2651. These silane coupling agents having multiple alkoxysilyl groups in their molecule are less volatile and are preferable because they are effective in improving durability due to having multiple alkoxysilyl groups. In particular, they offer good durability even when the substrate of an optical film with an adhesive layer is a transparent conductive layer (e.g., ITO) to which alkoxysilyl groups are less reactive compared to glass. Moreover, silane coupling agents having multiple alkoxysilyl groups in their molecule are preferably those having epoxy groups in their molecule, and it is even more preferable that they have multiple epoxy groups in their molecule. Silane coupling agents having multiple alkoxysilyl groups and epoxy groups in their molecule tend to have good durability even when the adherend is a transparent conductive layer (e.g., ITO). Specific examples of silane coupling agents having multiple alkoxysilyl groups and epoxy groups in their molecule include Shin-Etsu Chemical's X-41-1053, X-41-1059A, and X-41-1056, with Shin-Etsu Chemical's X-41-1056, which has a high epoxy group content, being particularly preferred.

[0099] The silane coupling agent (D) may be used alone or in a mixture of two or more types, but the total content is preferably 5 parts by weight or less, more preferably 0.001 to 5 parts by weight, more preferably 0.01 to 1 part by weight, more preferably 0.02 to 1 part by weight, and more preferably 0.05 to 0.6 parts by weight, per 100 parts by weight of the (meth)acrylic polymer (A). This amount is necessary to improve durability.

[0100] Furthermore, the adhesive composition of the present invention may contain other known additives, such as polyether compounds having reactive silyl groups, polyether compounds of polyalkylene glycols such as polypropylene glycol, powders such as colorants and pigments, dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light stabilizers, UV absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particulates, foils, etc., which can be added as appropriate depending on the application. In addition, a redox system with a reducing agent may be adopted within a controllable range. These additives are preferably used in amounts of 5 parts by weight or less, more preferably 3 parts by weight or less, and more preferably 1 part by weight or less, per 100 parts by weight of (meth)acrylic polymer (A).

[0101] The adhesive layer can be formed by, for example, applying the adhesive composition to a peeled separator, drying and removing the polymerization solvent, and then transferring the resulting adhesive layer to an optical film (polarizing film); or by applying the adhesive composition to an optical film (polarizing film), drying and removing the polymerization solvent, and then forming the adhesive layer on the optical film. When applying the adhesive, one or more solvents other than the polymerization solvent may be added as appropriate.

[0102] The thickness of the adhesive layer is not particularly limited, and is, for example, about 1 to 100 μm. Preferably, it is 2 to 50 μm, more preferably 2 to 40 μm, and even more preferably 5 to 35 μm.

[0103] The adhesive layer applied to the polarizing film with adhesive layer of the present invention preferably has a creep value of 120 μm or less at 85°C, more preferably 100 μm or less, even more preferably 85 μm or less, and particularly preferably 60 μm or less, from the viewpoint of application to a polarizing film with an irregular shape. The lower limit of the creep value is preferably 15 μm or more, and more preferably 30 μm or more. If the creep value exceeds 120 μm, cracks occurring in the polarizing film with an irregular shape may worsen, as described in the examples. If the creep value falls below 15 μm, the stress relaxation properties of the adhesive layer will be low, which may make the adhesive layer more prone to peeling during durability tests.

[0104] <Transparent layer> The following provides a detailed description of the transparent layer.

[0105] 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, more preferably 3 μm or less, more preferably 1.5 μm or less, and more preferably 1 μm or less. If the transparent layer is too thick, the thickness of the polarizing film will increase, which may further reduce the optical reliability of the polarizer. On the other hand, from the viewpoint of keeping the variation ratio of the surface resistance value of the adhesive layer small, the thickness of the transparent layer is preferably 0.1 μm or more, more preferably 0.2 μm or more, and more preferably 0.3 μm or more.

[0106] The material used to form the transparent layer can be one that is transparent and can suppress the influence of the conductive layer on the polarizer. Examples of such materials include a forming material containing a urethane prepolymer (a), which is a reaction product of an isocyanate compound and a polyhydric alcohol.

[0107] As isocyanate compounds, polyfunctional isocyanate compounds are preferred, specifically including polyfunctional aromatic isocyanate compounds, alicyclic isocyanates, aliphatic isocyanate compounds, or dimers thereof.

[0108] Examples of polyfunctional aromatic isocyanate compounds include phenylenediisocyanate, 2,4-tolylenediisosoanate, 2,6-tolylenediisocyanate, 2,2'-diphenylmethanediisocyanate, 4,4'-diphenylmethanediisocyanate, 4,4'-toluidinediisocyanate, 4,4'-diphenyletherdiisocyanate, 4,4'-diphenyldiisocyanate, 1,5-naphthalenediisocyanate, xylylenediisocyanate, methylenebis-4-phenylisocyanate, and p-phenylenediisocyanate.

[0109] Examples of polyfunctional alicyclic isocyanate compounds include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-bisisocyanatomethylcyclohexane, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate, and hydrogenated tetramethylxylylene diisocyanate.

[0110] Examples of polyfunctional aliphatic isocyanate compounds include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, and 2,4,4-trimethylhexamethylene diisocyanate.

[0111] Examples of polyfunctional isocyanate compounds include those having three or more isocyanate groups, such as tris(6-isocyanatehexyl) isocyanurate.

[0112] Examples of polyhydric alcohols include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, and polypropylene glycol.

[0113] In the present invention, it is preferable to use a rigid urethane prepolymer (a) in which a large proportion of the molecular structure consists of cyclic structures (benzene rings, cyanurate rings, isocyanurate rings, etc.). For example, the polyfunctional isocyanate compound can be used alone or in combination of two or more, but from the viewpoint of suppressing moisture contamination of the polarizer, aromatic isocyanate compounds are preferred. Other polyfunctional isocyanate compounds can be used in combination with aromatic isocyanate compounds. In particular, among aromatic isocyanate compounds, it is preferable to use at least one selected from tolylene diisocyanate and diphenylmethane diisocyanate as the isocyanate compound.

[0114] As the urethane prepolymer (a), trimethylolpropane-tri-tylene isocyanate and trimethylolpropane-tri-diphenylmethane diisocyanate are preferably used. The urethane prepolymer (a) is a compound having terminal isocyanate groups, and can be obtained, for example, by mixing an isocyanate compound with a polyhydric alcohol, stirring, and reacting the mixture. It is generally preferable to mix the isocyanate compound with the polyhydric alcohol such that there is an excess of isocyanate groups compared to the hydroxyl groups of the polyhydric alcohol.

[0115] Furthermore, the urethane prepolymer (a) may also be one in which a protecting group is attached to the terminal isocyanate group. Examples of protecting groups include oximes and lactams. When the isocyanate group is protected, heating causes the protecting group to dissociate from the isocyanate group, allowing the isocyanate group to react.

[0116] The material that forms the transparent layer may contain, in addition to the urethane prepolymer (a), a compound (b) having at least two functional groups having active hydrogen that reacts with isocyanate groups. Examples of functional groups having active hydrogen that reacts with isocyanate groups include hydroxyl groups and amino groups. The more functional groups having active hydrogen that compound (b) has, the more reaction sites there are with the isocyanate groups of the urethane prepolymer (a), making it easier to form a cured product. Therefore, it is preferable that the number of functional groups be three or more.

[0117] Furthermore, it is preferable that compound (b) has a molecular weight divided by the number of functional groups of 350 or less. By defining the relationship between molecular weight and the number of functional groups in this way, the reactivity between compound (b) and the isocyanate groups of the urethane prepolymer (a) can be ensured.

[0118] Furthermore, it is preferable that the molecular weight of compound (b) is 1000 or less. Compound (b) with a molecular weight in the range of 1000 or less is preferable in terms of compatibility when preparing the forming material as a solution together with the urethane prepolymer (a).

[0119] Examples of the compound (b) include polyhydric alcohols, polyhydric amines, and compounds having both a hydroxyl group and an amino group in their molecule.

[0120] Examples of polyhydric alcohols 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, and 1,8-decanediol. Examples include difunctional alcohols such as octadecanediol and polypropylene glycol; trifunctional alcohols such as glycerin and trimethylolpropane; tetrafunctional alcohols such as pentaerythritol, hexanetriol, and sorbitol; and alkylene oxide (e.g., propylene oxide) adducts to the aforementioned polyhydric alcohols, such as polyoxypropylene glyceryl ether, polyoxypropylene trimethylolpropane ether, and polyoxypropylene sorbitol ether.

[0121] Examples of polyhydric amines include ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, isophoronediamine, dicyclohexylmethane-4,4'-diamine, and dimeramine.

[0122] Furthermore, examples of compounds having hydroxyl and amino groups in their molecules include diamines having hydroxyl groups in their molecules, such as 2-hydroxyethylethylenediamine, 2-hydroxyethylpropylenediamine, di-2-hydroxyethylethylenediamine, di-2-hydroxyethylpropylenediamine, 2-hydroxypropylethylenediamine, and di-2-hydroxypropylethylenediamine; Examples include alkanolamines such as ethanolamine, diethanolamine, and triethanolamine.

[0123] As for compound (b), it is preferable to use a polyhydric alcohol in order to prevent deterioration of the optical reliability of the polarizer, and in particular, trimethylolpropane is preferred in terms of its reactivity with the urethane prepolymer (a).

[0124] The forming material contains the urethane prepolymer (a) as its main component. Preferably, the urethane prepolymer (a) contains 50% by weight or more of the solid content of the forming material.

[0125] The blending ratio of compound (b) to the urethane prepolymer (a) is preferably 5% by weight or more, based on the total weight (solid content ratio) of the urethane prepolymer (a) and compound (b) of 100% by weight. From the viewpoint of improving film strength, the blending ratio of compound (b) is preferably 10% by weight or more. On the other hand, if the blending ratio of compound (b) is too high, the optical reliability of the polarizer may deteriorate, so the blending ratio of compound (b) is preferably 80% by weight or less, and more preferably 50% by weight or less.

[0126] The forming material may be further enhanced by using a reaction catalyst to increase the reactivity of the isocyanate group. The reaction catalyst is not particularly limited, but tin-based or amine-based catalysts are preferred. One or more reaction catalysts may be used. The amount of reaction catalyst used is usually 5 parts by weight or less per 100 parts by weight of urethane prepolymer (a). If the amount of reaction catalyst is too large, the crosslinking reaction rate will increase, causing foaming of the forming material. Sufficient adhesion cannot be obtained even if the forming material is used after foaming. When using a reaction catalyst, it is usually preferable to use 0.01 to 5 parts by weight, and more preferably 0.05 to 4 parts by weight.

[0127] Furthermore, a reaction catalyst can be used to increase the reactivity of the isocyanate group. The reaction catalyst is not particularly limited, but tin-based or amine-based catalysts are preferred. One or more reaction catalysts can be used. The amount of reaction catalyst used is usually 5 parts by weight or less per 100 parts by weight of urethane prepolymer. If the amount of reaction catalyst is too high, the crosslinking reaction rate will increase, causing foaming of the forming material. Sufficient adhesion cannot be obtained even if the forming material is used after foaming. When using a reaction catalyst, 0.01 to 5 parts by weight, and more preferably 0.05 to 4 parts by weight, is generally preferred.

[0128] Both inorganic and organic tin catalysts can be used, but organic catalysts are preferred. Examples of inorganic tin catalysts include stannous chloride and stannic chloride. Organic tin catalysts are preferably those having at least one organic group, such as an aliphatic group or alicyclic group with a skeleton such as a methyl group, ethyl group, ether group, or ester group. Examples include tetra-n-butyltin, tri-n-butyltin acetate, n-butyltin trichloride, trimethyltin hydroxide, dimethyltin dichloride, and dibutyltin dilaurate.

[0129] Furthermore, there are no particular limitations on the amine catalyst. For example, catalysts having at least one organic group such as an alicyclic group, such as quinocliidine, amidine, or diazabicycloundecene, are preferred. Other examples of amine catalysts include triethylamine. Examples of reaction catalysts other than those mentioned above include cobalt naphthenate and benzyltrimethylammonium hydroxide.

[0130] The forming material is typically used as a solution containing the urethane prepolymer (a) and the compound (b). The solution may be solvent-based, or it may be aqueous-based, such as an emulsion, colloidal dispersion, or aqueous solution.

[0131] The organic solvent is not particularly limited as long as it does not have a functional group having active hydrogen that is reactive with the isocyanate group and uniformly dissolves the urethane prepolymer (a) and compound (b) that constitute the forming material. One or more organic solvents can be used in combination. In addition, different organic solvents can be used for the urethane prepolymer (a) and compound (b). In this case, the forming material can be prepared by mixing each solution after preparing each solution. Furthermore, the viscosity of the forming material can be adjusted by adding more organic solvents to the prepared forming material. Moreover, even in the case of solvent-based solutions dissolved in organic solvents, alcohols or water as exemplified below can be included as solvents.

[0132] Examples of organic solvents include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; aliphatic or alicyclic hydrocarbons such as hexane, cyclohexane, and methylcyclohexane; halogenated alkanes such as 1,2-dichloroethane; ethers such as tert-butyl methyl ether; and ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cyclopentanone, and acetylacetone.

[0133] Furthermore, when creating an aqueous system, alcohols such as n-butyl alcohol and isopropyl alcohol, or ketones such as acetone, can be added. This can be done by using a dispersant or by introducing functional groups that have low reactivity with isocyanate groups, such as carboxylates, sulfonates, and quaternary ammonium salts, or water-dispersible components such as polyethylene glycol, into the urethane prepolymer.

[0134] Examples of materials for forming the transparent layer other than the urethane prepolymer include cyanoacrylate-based forming materials, epoxy-based forming materials, and urethane acrylate-based forming materials.

[0135] The formation of the transparent layer can be appropriately selected depending on the type of forming material, but for example, it can be performed by coating the forming material onto a polarizer or the like and then curing it, and the transparent layer can be obtained as a coated layer. Usually, after coating, the hardened layer is formed by drying at about 30 to 100°C, preferably 50 to 80°C, for about 0.5 to 15 minutes. Furthermore, if the forming material contains an isocyanate component, an annealing treatment can be performed at about 30 to 100°C, preferably 50 to 80°C, for about 0.5 to 24 hours to promote the reaction.

[0136] <Image display panel, image display device> The adhesive-coated polarizing film of the present invention can be applied to various image display panels, and said image display panels can be applied to conventional image display devices. The other configurations of the image display device are the same as those of conventional image display devices. Specific examples of image display devices to which the image display panel can be applied include liquid crystal displays, electroluminescent (EL) displays, plasma displays (PDs), field emission displays (FEDs), and the like.

[0137] The polarizing film with an adhesive layer of the present invention exhibits a small variation ratio in surface resistance and is suitable for application to liquid crystal panels with built-in touch sensing functions.

[0138] Furthermore, in addition to the above configuration, optical films such as phase difference films, viewing angle compensation films, and brightness enhancement films can be appropriately provided on the liquid crystal panel.

[0139] The liquid crystal layer is not particularly limited, and any type can be used, such as TN type, STN type, π type, VA type, IPS type, etc. The transparent substrate 9 (light source side) can be any transparent substrate, and its material is not particularly limited, but examples include glass and transparent resin film substrates. The transparent resin film substrates are those mentioned above.

[0140] Furthermore, on the light source side relative to the liquid crystal layer, a polarizing film with an adhesive layer, which has been conventionally used in this field, can be used, and the one described herein can also be suitably used.

[0141] Specific examples of the above-mentioned liquid crystal panel with built-in touch sensing function are shown, for example, in Figures 6 to 8. In Figures 6 to 8, the case in which the adhesive-layered polarizing film 1 shown in Figure 1 (however, the description of the conductive layer c is omitted) is used on the viewing side of the liquid crystal cell is illustrated as the adhesive-layered polarizing film of the present invention. That is, the single protective polarizing film 11 and adhesive layer 21 in Figure 1 are shown as the first polarizing film 11 and first adhesive layer 21 in Figures 6 to 8.

[0142] Figure 6 shows a so-called in-cell type liquid crystal panel with built-in touch sensing function, which has the following configuration from the viewing side: first polarizing film 11 / first adhesive layer 21 / first transparent substrate 41 / touch sensor part 5 / liquid crystal layer 3 / drive electrode and sensor part 6 / second transparent substrate 42 / second adhesive layer 22 / second polarizing film 12. In the in-cell type liquid crystal panel with built-in touch sensing function shown in Figure 6, for example, the liquid crystal cell C has a touch sensor part 5 and a drive electrode and sensor part 6 within the first and second glass substrates 41 and 42 (within the liquid crystal cell) sandwiching the liquid crystal layer 3.

[0143] Furthermore, Figure 7 shows a modified example of a so-called in-cell (semi-in-cell) liquid crystal panel with built-in touch sensing function, and has the following configuration from the viewing side: first polarizing film 11 / first adhesive layer 21 / touch sensor part 5 / first transparent substrate 41 / liquid crystal layer 3 / drive electrode and sensor part 6 / second transparent substrate 42 / second adhesive layer 22 / second polarizing film 12. In the in-cell liquid crystal panel with built-in touch sensing function of Figure 7, for example, the liquid crystal cell C is outside the first transparent substrate 41 and the touch sensor part 5 is in direct contact with the first adhesive layer 21, and the drive electrode and sensor part 6 is located on the side of the second transparent substrate 42 inside the first and second glass substrates 41 and 42 (inside the liquid crystal cell) that sandwich the liquid crystal layer 3.

[0144] Furthermore, Figure 8 shows a so-called on-cell type liquid crystal panel with built-in touch sensing function, and has the following configuration from the viewing side: first polarizing film 11 / first adhesive layer 21 / touch sensor part 5 / drive electrode and sensor part 6 / first transparent substrate 41 / liquid crystal layer 3 / drive electrode 7 / second transparent substrate 42 / second adhesive layer 22 / second polarizing film 12. In the on-cell type liquid crystal panel with built-in touch sensing function of Figure 8, for example, the liquid crystal cell C has a touch sensor part 5 and a drive electrode and sensor part 6 on the outside of the first transparent substrate 41, the touch sensor part 5 is in direct contact with the first adhesive layer 21, and the drive electrode 7 is on the side of the second transparent substrate 42 inside the first and second glass substrates 41 and 42 (inside the liquid crystal cell) that sandwich the liquid crystal layer 3.

[0145] In a liquid crystal panel with a built-in touch sensing function, when the touch sensor portion 5 of the liquid crystal cell C and the first adhesive layer 21 are in direct contact, the antistatic function of the first adhesive layer 21 (containing an ionic compound) tends to deteriorate, especially in humid environments. Therefore, the liquid crystal panel with a built-in touch sensing function of the present invention is preferably applied to the in-cell type (modified) or on-cell type liquid crystal panel with a built-in touch sensing function shown in Figure 7 or Figure 8, among the examples above.

[0146] Furthermore, the first polarizing film 11 positioned on the viewing side of the liquid crystal cell C and the second polarizing film 12 positioned on the opposite side of the viewing side may be laminated with other optical films depending on the suitability of their respective positions. Examples of such other optical films include reflectors, antitransmitting plates, phase difference films (including 1 / 2 and 1 / 4 wave plates), visual compensation films, brightness enhancement films, and other optical layers that may be used in the formation of liquid crystal display devices. These can be used in one or two or more layers. Even when using these other optical films, it is preferable that the adhesive layer closest to the liquid crystal layer 3 be the first adhesive layer 21.

[0147] The liquid crystal layer 3 of the liquid crystal cell C is a liquid crystal layer containing homogeneously oriented liquid crystal molecules in the absence of an electric field, which is applied to a liquid crystal panel with a built-in touch sensing function. For example, an IPS-type liquid crystal layer is preferably used as the liquid crystal layer 3. In addition, any type of liquid crystal layer, such as TN type, STN type, π type, or VA type, can be used as the liquid crystal layer 3. The thickness of the liquid crystal layer is, for example, about 1.5 μm to 4 μm.

[0148] In the liquid crystal cell C, the first transparent substrate 41 and the second transparent substrate 42 can form a liquid crystal cell with the liquid crystal layer 3 in between. Depending on the configuration of the liquid crystal panel with built-in touch sensing function, a touch sensor section 5, a drive electrode / sensor section 6, a drive electrode 7, etc., can be formed inside or outside the liquid crystal cell. In addition, a color filter substrate can be provided on the liquid crystal cell (first transparent substrate 41).

[0149] The material used to form the transparent substrate may be, for example, glass or a polymer film. Examples of polymer films include polyethylene terephthalate, polycycloolefin, and polycarbonate. When the transparent substrate is made of glass, its thickness is, for example, about 0.3 mm to 1 mm. When the transparent substrate is made of a polymer film, its thickness is, for example, about 10 μm to 200 μm. The transparent substrate may have an easy-adhesion layer or a hard coat layer on its surface.

[0150] The touch sensor section 5 (capacitive sensor), the drive electrode / sensor section 6, and the drive electrode 7 are formed as a transparent conductive layer. The constituent material of the transparent conductive layer is not particularly limited and includes, for example, metals such as gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, and tungsten, and alloys of these metals. In addition, metal oxides of indium, tin, zinc, gallium, antimony, zirconium, and cadmium can be used as constituent materials of the transparent conductive layer, and specifically include metal oxides consisting of indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof. Other metal compounds such as copper iodide can also be used. The metal oxide may, if necessary, further contain oxides of the metal atoms shown in the above group. For example, indium oxide (ITO) containing tin oxide and tin oxide containing antimony are preferably used, and ITO is particularly preferred. The ITO preferably contains 80 to 99% by weight of indium oxide and 1 to 20% by weight of tin oxide.

[0151] There are no restrictions on where the touch sensor layer 5 is formed in the liquid crystal cell C, and the touch sensor layer 5 is formed according to the configuration of the liquid crystal panel with built-in touch sensing function. For example, in Figures 6 to 8, an example is shown in which the touch sensor layer 5 is placed between the first polarizing film 11 and the liquid crystal layer 3. The touch sensor layer 5 can be formed, for example, as a transparent electrode pattern on the first transparent substrate 41. The drive electrode / sensor part 6 and the drive electrode 7 can also be formed as transparent electrode patterns according to conventional methods according to the configuration of the liquid crystal panel with built-in touch sensing function. The transparent electrode pattern is usually electrically connected to a routing wire (not shown) formed at the edge of the transparent substrate, and the routing wire is connected to a controller IC (not shown). In addition to a comb shape, the transparent electrode pattern can be any shape depending on the application, such as a stripe shape or a diamond shape. The height of the transparent electrode pattern is, for example, 10 nm to 100 nm, and the width is 0.1 mm to 5 mm.

[0152] Furthermore, the LCD panel with built-in touch sensing function can appropriately utilize components for forming the liquid crystal display device, such as those using a backlight or reflector in the lighting system. [Examples]

[0153] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. All parts and percentages in each example are based on weight. Unless otherwise specified below, room temperature storage conditions are 23°C and 65% RH.

[0154] <Measurement of weight-average molecular weight of (meth)acrylic polymer (A)> The weight-average molecular weight (Mw) of (meth)acrylic polymer (A) was measured by GPC (gel permeation chromatography). The Mw / Mn ratio was measured in the same manner. • Analytical instrument: Tosoh Corporation, HLC-8120GPC • Column: Tosoh Corporation, G7000H XL +GMH XL +GMH XL • Column size: 7.8mmφ x 30cm each, total 90cm Column temperature: 40°C ·Flow rate: 0.8mL / min ·Injection volume: 100μL • Eluent: Tetrahydrofuran • Detector: Differential refractometer (RI) • Standard sample: Polystyrene

[0155] <Manufacturing Example 1> (Preparation of HC-coated 40μm TAC film and HC-coated 25μm TAC film) A resin solution (manufactured by DIC Corporation, product name: Unidick 17-806, solids content: 80%) in which a UV-curable resin monomer or oligomer mainly composed of urethane acrylate is dissolved in butyl acetate was prepared. To this solution, 5 parts of a photopolymerization initiator (manufactured by BASF Corporation, product name: IRGACURE907) and 0.1 parts of a leveling agent (manufactured by DIC Corporation, product name: GRANDIC PC4100) were added per 100 parts of solids. Then, cyclopentanone and propylene glycol monomethyl ether were added to the solution in a ratio of 45:55 to prepare a hard coat layer forming material so that the solids content of the solution was 36%. The prepared hard coat layer forming material was applied to TJ40UL (manufactured by Fujifilm, raw material: triacetylcellulose polymer, thickness: 40 μm) so that the thickness of the hard coat layer after curing was 7 μm to form a coating film. Afterward, the coating was dried at 90°C for 1 minute, and then exposed to a high-pressure mercury lamp with an accumulated light intensity of 300 mJ / cm². 2 The coating film was irradiated with ultraviolet light to cure it and form a hard coat layer (HC), thereby producing a 40 μm TAC film with HC. Similarly, a 25μm TAC film with HC was fabricated by forming a hard coat layer (HC) with the same thickness as described above on TJ25UL (manufactured by Fujifilm, raw material: triacetylcellulose polymer, thickness: 25μm).

[0156] <Manufacturing Example 2> (Preparation of 30μm acrylic film) In a 30L capacity kettle-type reactor equipped with a stirrer, temperature sensor, condenser, and nitrogen inlet tube, 8,000g of methyl methacrylate (MMA), 2,000g of methyl 2-(hydroxymethyl)acrylate (MHMA), 10,000g of 4-methyl-2-pentanone (methyl isobutyl ketone, MIBK), and 5g of n-dodecyl mercaptan were charged. While passing nitrogen through the reactor, the temperature was raised to 105°C and refluxed. At the same time, 5.0g of t-butyl peroxyisopropyl carbonate (Kayacarbon BIC-7, manufactured by Kayaku Akzo Co., Ltd.) was added as a polymerization initiator, and a solution consisting of 10.0g of t-butyl peroxyisopropyl carbonate and 230g of MIBK was added dropwise over 4 hours. Solution polymerization was carried out under reflux at approximately 105-120°C, and the mixture was then aged for another 4 hours. To the obtained polymer solution, 30 g of stearyl phosphate / distearyl phosphate mixture (Phoslex A-18, manufactured by Sakai Chemical Industry Co., Ltd.) was added, and a cyclization condensation reaction was carried out under reflux at approximately 90-120°C for 5 hours. Next, the obtained polymer solution was introduced into a twin-screw extruder with a vent type screw (φ=29.75 mm, L / D=30) with a barrel temperature of 260°C, a rotation speed of 100 rpm, a reduced pressure of 13.3-400 hPa (10-300 mmHg), one rear vent, and four fore vents, at a processing speed of 2.0 kg / h in terms of resin volume. Further cyclization condensation reactions and defoliation were carried out in this extruder, and transparent pellets of lactone ring-containing polymer were obtained by extrusion. Dynamic TG measurement of the obtained lactone ring-containing polymer detected a mass loss of 0.17% by mass. This lactone ring-containing polymer had a weight-average molecular weight of 133,000, a melt flow rate of 6.5 g / 10 min, and a glass transition temperature of 131°C. The obtained pellets were mixed with acrylonitrile-styrene (AS) resin (Toyo ASAS20, manufactured by Toyo Styrene Co., Ltd.) in a mass ratio of 90 / 10 and extruded using a single-screw extruder (screw 30 mmφ) to obtain transparent pellets. The glass transition temperature of the obtained pellets was 127°C. These pellets were extruded using a 50 mmφ single-screw extruder through a 400 mm wide coat hanger type T-die to produce a 120 μm thick film. The produced film was then stretched using a biaxial stretching apparatus at a temperature of 150°C to 2.0 times its length in both the longitudinal and transverse directions to obtain a 30 μm thick stretched film (30 μm acrylic film). The optical properties of this stretched film were measured, and the total light transmittance was 93%, the in-plane phase difference Δnd was 0.8 nm, and the thickness-direction phase difference Rth was 1.5 nm.

[0157] <Preparation of polarizing film (1)> A 45 μm thick polyvinyl alcohol film was stretched to 3 times its original size while being stained for 1 minute in a 0.3% iodine solution at 30°C between rolls with different speed ratios. Then, it was stretched to a total stretch ratio of 6 times while being immersed for 0.5 minutes in an aqueous solution containing 4% boric acid and 10% potassium iodide at 60°C. Next, it was washed by immersing it for 10 seconds in an aqueous solution containing 1.5% potassium iodide at 30°C, and then dried at 50°C for 4 minutes to obtain an 18 μm thick polarizer. A polarizing film (1) was prepared by laminating a saponified HC-coated 40 μm TAC film (triacetylcellulose film side) obtained in Production Example 1 to one side of the polarizer, and a 30 μm acrylic film obtained in Production Example 2 to the other side, using a polyvinyl alcohol-based adhesive.

[0158] <Preparation of polarizing film (2)> (Fabrication of thin polarizer A) An amorphous isophthalic copolymer polyethylene terephthalate (IPA copolymer PET) film (thickness: 100 μm) substrate with a water absorption rate of 0.75% and a Tg of 75℃ was subjected to corona treatment on one side. An aqueous solution containing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetoacetyl-modified PVA (degree of polymerization 1200, degree of acetoacetyl modification 4.6%, degree of saponification 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "Gosephymer Z200") in a 9:1 ratio was applied to this corona-treated surface and dried at 25℃ to form an 11 μm thick PVA-based resin layer, thereby producing a laminate. The resulting laminate was uniaxially stretched to a 2.0x length in the longitudinal direction between rolls with different peripheral speeds in an oven at 120°C (air-assisted stretching). Next, the laminate was immersed for 30 seconds in an insolubilization bath at a liquid temperature of 30°C (a boric acid aqueous solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) (insolubilization treatment). Next, the polarizing plates were immersed in a dyeing bath at a liquid temperature of 30°C, adjusting the iodine concentration and immersion time so that the polarizing plates had a predetermined transmittance. In this example, the polarizing plates were immersed for 60 seconds in an iodine aqueous solution prepared by mixing 0.2 parts by weight of iodine and 1.0 part by weight of potassium iodide with 100 parts by weight of water (dyeing treatment). Next, the material was immersed for 30 seconds in a crosslinking bath at a liquid temperature of 30°C (a boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with 100 parts by weight of water) (crosslinking treatment). Subsequently, the laminate was immersed in a boric acid aqueous solution at a liquid temperature of 70°C (an aqueous solution obtained by mixing 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with 100 parts by weight of water) and uniaxially stretched in the longitudinal direction (longitudinal direction) between rolls with different peripheral speeds to achieve a total stretch ratio of 5.5 times (underwater stretching treatment). Subsequently, the laminate was immersed in a washing bath at a liquid temperature of 30°C (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) (washing treatment). Based on the above, an optical film laminate containing a polarizer with a thickness of 5 μm was obtained.

[0159] (Preparation of adhesive to be applied to transparent protective film) A UV-curable adhesive was prepared by mixing 45 parts by weight of acryloylmorpholine, 45 parts of 1,9-nonanediol diacrylate, 10 parts of an acrylic oligomer obtained by polymerizing (meth)acrylic monomer (ARUFONUP1190, manufactured by Toagosei Co., Ltd.), 3 parts of a photopolymerization initiator (IRGACURE 907, manufactured by BASF), and 1.5 parts of a polymerization initiator (KAYACURE DETX-S, manufactured by Nippon Kayaku Co., Ltd.).

[0160] <Preparation of polarizing film (2)> The UV-curable adhesive was applied to the surface of polarizer A of the optical film laminate described above, so that the thickness of the cured adhesive layer would be 1 μm. Then, the HC-coated 25 μm TAC film (triacetylcellulose film side) obtained in Manufacturing Example 1 was laminated to it, and the adhesive was cured by irradiation with ultraviolet light as the active energy ray. The UV irradiation was performed using a gallium-filled metal halide lamp, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., bulb: V-bulb, peak illuminance: 1600 mW / cm². 2 Total irradiation dose 1000 / mJ / cm 2 Using ultraviolet light in the wavelength range of 380-440 nm, the irradiance was measured using a Sola-Check system manufactured by Solatell. Next, the amorphous PET substrate was peeled off, and a polarizing film (2) was fabricated using a thin polarizer. The optical properties of the obtained polarizing film were a single-layer transmittance of 42.8% and a polarization degree of 99.99%.

[0161] <Fabrication of a polarizing film with a transparent layer (2)> A transparent layer-forming material was applied to the polarizer surface of the polarizing film (2) described above (the polarizer surface without the HC-coated 25μm TAC film) using a bar coater, and then heat-treated at 60°C for 12 hours to form a 3μm thick urethane resin layer, thereby creating a polarizing film (2) with a transparent layer.

[0162] ≪Transparent layer forming agent≫ As the solution for urethane prepolymer (a), a 75% ethyl acetate solution of urethane prepolymer consisting of tolylene diisocyanate (TDI) and trimethylolpropane (TMP) (manufactured by Tosoh Corporation, trade name "Coronate L") was used. On the other hand, trimethylolpropane solution was prepared by dissolving trimethylolpropane in cyclopentanone to a solid content concentration of 10%. To 100 parts of a 75% ethyl acetate solution of the above urethane prepolymer (manufactured by Tosoh Corporation, trade name "Coronate L"), the above trimethylolpropane solution was added so that the solid content ratio of urethane prepolymer to trimethylolpropane was 90:10. Furthermore, 0.1 parts of a dioctyl tin dilaurate-based catalyst (manufactured by Tokyo Fine Chemical Co., Ltd., trade name "Envirizer OL-1") was added, and the forming material (coating liquid) was prepared by adjusting the solid content concentration to 10% with methyl isobutyl ketone as the solvent.

[0163] <Preparation of conductive layer forming material> A coating solution for forming a conductive layer with a solid content of 0.5% by weight was prepared by mixing 8.6 parts of a solution containing 10-50% by weight of a thiophene-based polymer (product name: Denatron P-580W, manufactured by Nagase ChemteX Corporation), 1 part of a solution containing an oxazoline group-containing acrylic polymer (product name: Epocross WS-700, manufactured by Nippon Shokubai Co., Ltd.), and 90.4 parts of water. The resulting coating solution for forming a conductive layer contained 0.04% by weight of a polythiophene-based polymer and 0.25% by weight of an oxazoline group-containing acrylic polymer.

[0164] Example 1 (Fabrication of polarizing film with conductive layer) The conductive layer forming solution was applied to the acrylic film side of the polarizing film (1) so that the thickness after drying was 0.06 μm, and the conductive layer was formed by drying at 80°C for 2 minutes. The resulting conductive layer contained 8% by weight of a thiophene-based polymer and 50% by weight of an oxazoline group-containing acrylic polymer, respectively.

[0165] (Preparation of acrylic polymer (A)) A monomer mixture containing 78.9 parts butyl acrylate, 16 parts phenoxyethyl acrylate, 5 parts acrylic acid, and 0.1 parts 4-hydroxybutyl acrylate was charged into a four-necked flask equipped with a stirring blade, thermometer, nitrogen gas inlet tube, and condenser. Furthermore, 0.1 parts 2,2'-azobisisobutyronitrile was added as a polymerization initiator to 100 parts of the monomer mixture (solid content) together with 100 parts ethyl acetate. After introducing nitrogen gas and purging the mixture with nitrogen while gently stirring, the polymerization reaction was carried out for 8 hours while maintaining the liquid temperature in the flask at around 55°C to prepare a solution of an acrylic polymer with a weight-average molecular weight (Mw) of 2.2 million and Mw / Mn = 4.0.

[0166] (Preparation of adhesive composition) To 100 parts of the solid content of the acrylic polymer solution obtained above, 1 part of bis(trifluoromethanesulfonyl)imide lithium, 0.6 parts of isocyanate crosslinking agent (Coronate L, trimethylolpropanetolylene diisocyanate, manufactured by Tosoh Corporation), 0.1 parts of benzoyl peroxide (Nippon Oil & Fats Co., Ltd., manufactured by Niper BMT), and 0.3 parts of epoxy group-containing silane coupling agent (Shin-Etsu Chemical Co., Ltd., manufactured by X-41-1056) were added to prepare a solution of an acrylic adhesive composition.

[0167] (Preparation of polarizing film with adhesive layer) Next, a solution of the above acrylic adhesive composition was applied to one side of a polyethylene terephthalate film (separator film: manufactured by Mitsubishi Chemical Polyester Film Co., Ltd., MRF38) treated with a silicone release agent, so that the thickness of the adhesive layer after drying would be 20 μm. The film was then dried at 155°C for 1 minute to form an adhesive layer on the surface of the separator film. Subsequently, the adhesive layer formed on the separator film was transferred to the conductive layer of the polarizing film (1) prepared above to produce a polarizing film with an adhesive layer.

[0168] Examples 2-13, Comparative Examples 1, 2 In Example 1, as shown in Table 1, solutions of the acrylic polymer (A) described in Table 1 were prepared by changing the type of monomer used in the preparation of the acrylic polymer (A), its usage ratio, and controlling the manufacturing conditions.

[0169] Furthermore, as shown in Table 1, a polarizing film with an adhesive layer was prepared in the same manner as in Example 1, except that the type of polarizing film, the presence or absence of a conductive layer formation, the type or blending ratio of the ionic compound (B) used in the preparation of the adhesive composition, and the amount of crosslinking agent were changed as shown in Table 1. When the polarizing film (2) was used as the polarizing film, the same conductive layer was formed on the polarizer surface of the polarizing film (2) (the polarizer surface without the HC-coated 25 μm TAC film), and when the polarizing film with a transparent layer (2) was used, the same conductive layer was formed on the transparent layer of the polarizing film with a transparent layer (2). In Comparative Examples 1 and 2, no conductive layer was formed.

[0170] The polarizing films with adhesive layers obtained in the above examples, comparative examples, and reference materials were evaluated as follows. The evaluation results are shown in Table 1.

[0171] <Surface resistance (Ω / □): Conductivity> The surface resistance of the conductive layer was measured on the conductive layer side surface of the polarizing film with the conductive layer before the adhesive layer was formed. The surface resistance of the adhesive layer was measured on the surface of the adhesive layer formed on the separator film. The measurements were performed using an MCP-HT450 manufactured by Mitsubishi Chemical Analytec Co., Ltd.

[0172] <Measuring creep value> The upper end portion (10 mm × 10 mm) of a polarizing film with an adhesive layer (thickness of the adhesive layer: 20 μm) cut to a size of 10 mm × 30 mm was adhered to a SUS plate through the adhesive layer and autoclaved at 50°C and 5 atm for 15 minutes. A precision hot plate installed so that the heating surface was vertical was heated to 85°C, and the SUS plate with the polarizing film with the adhesive layer adhered thereto was placed so that the surface without the adhesive layer adhered was in contact with the heating surface of the hot plate. Five minutes after the SUS plate started to be heated at 85°C, a load of 500 g was applied to the lower end portion of the polarizing film with the adhesive layer and left for 1 hour, and the deviation width between the polarizing film with the adhesive layer and the SUS plate before and after the load application was measured, and this deviation width was taken as the creep value (μm) at 85°C.

[0173] <Evaluation of irregular cracks> The prepared polarizing film with an adhesive layer was processed into the shape shown in FIG. 5 using a CO2 laser processing machine Spirit (manufactured by GCC, 30 W) under the conditions of a speed of 10, a laser output of 35, and 400 ppi. The irregularly processed polarizing film with an adhesive layer was bonded to a non-alkali glass (manufactured by Corning, product name "EG-XG") with a thickness of 350 mm × 250 mm × 0.7 mm, and then autoclaved at 50°C and 0.5 MPa for 15 minutes to adhere the adhesive layer to the glass. The samples subjected to such treatment were put into a heat cycle test chamber, and the presence or absence of cracks generated in the irregular portions at the 100-cycle and 200-cycle points was visually confirmed. Five identical samples were put in for each condition, and the number of samples in which cracks occurred was described in Table 1. (Test conditions) Temperature condition: -40°C (held for 30 minutes) ⇒ 85°C (held for 30 minutes) is repeated as one cycle. Heating and cooling rate: 10°C / min

[0174] <ESD test> After peeling the separator film from the adhesive-coated polarizing film, it was bonded to the viewing side of an in-cell liquid crystal cell to create a liquid crystal panel with a built-in touch sensing function. Specifically, the obtained adhesive-coated polarizing film was bonded to the first transparent substrate of the in-cell liquid crystal cell shown in Figure 6 to form the first adhesive layer and the first polarizing film. An ESD (electrostatic discharge) gun (10kV) was fired at the polarizing film surface of the liquid crystal panel, and the time until the electrically depleted white areas disappeared was measured and judged according to the following criteria. (Evaluation Criteria) A: Within 0.5 seconds. B: Over 0.5 seconds but within 1 second. C: More than 1 second but less than 10 seconds. D: Exceeds 10 seconds.

[0175] <Durability Test> The prepared polarizing film with adhesive layer was cut to a size of 300 x 220 mm so that the absorption axis of the polarizing film was parallel to the long side. This polarizing film with adhesive layer was laminated to alkali-free glass (Corning, product name "EG-XG") measuring 350 x 250 mm x 0.7 mm thick using a laminator. Next, it was autoclaved at 50°C and 0.5 MPa for 15 minutes to adhere the adhesive layer to the glass. After treating the sample in this manner, it was subjected to treatment at 95°C for 500 hours, and then again at 60°C / 95% RH for 500 hours, and the appearance of the sample was visually evaluated according to the following criteria. (Evaluation Criteria) A: There are absolutely no visible changes such as foaming or peeling. B: There is slight peeling or foaming at the edges, but it does not affect practical use. C: There is some peeling or foaming at the edges, but this does not pose a practical problem unless it is for a special application. D: There is significant peeling at the edges, which is a practical problem.

[0176] <Evaluation of color fading at the edges> The polarizing films with adhesive layers obtained in the examples and comparative examples were cut to 50 mm x 50 mm, the separator film was peeled off, and then the films were bonded to 1.2-1.5 mm thick alkali glass (Matsunami Glass Co., Ltd., microslide glass) via the adhesive layer to prepare samples. After holding these samples in a high-temperature, high-humidity environment of 60°C and 90% RH for 500 hours, the amount of edge discoloration was measured using a differential interference microscope (Olympus, product name "MX-61L") under the following conditions. The amount of edge discoloration was defined as the distance between the corner and the point closest to the center among the areas where the color was lighter than the center, along the diagonal lines of the four corners of the sample. The average value of the four corners was taken as the amount of edge discoloration for that sample. Equipment: Olympus MX-61L Measurement conditions Lens magnification: 5x ISO:200 Shutter speed: 1 / 100 Reflected light intensity: Scale 0 White balance: Auto Transmitted light controller: LG-PS2 Transmitted light intensity: Scale 5 Transmitted light polarization direction: The direction in which the polarization is crossed with respect to the transmission axis of the polarizing film.

[0177] [Table 1]

[0178] In Table 1, BA is butyl acrylate, PEA is phenoxyethyl acrylate. AA is acrylic acid, NVP is N-vinyl-2-pyrrolidone. HBA is 4-hydroxybutyl acrylate. Isocyanate-based isocyanate crosslinking agents (Tosoh Corporation's Coronate L, trimethylolpropane tolylene diisocyanate), BPO is benzoyl peroxide (Nippon Oil & Fats Co., Ltd.'s NaiPer BMT), Li-TFSI is bis(trifluoromethanesulfonyl)imide lithium. K-bis(trifluoromethanesulfonyl)imide potassium TMPA-TFSI is trimethylpropylammonium bis(trifluorosulfonyliimide), EMP-TFSI is ethylmethylpyrrolidinium bis(trifluorosulfonylimide), TBMA-TFSI is tributylmethylammonium bis(fluorosulfonylimide), MTOA-TFSI stands for methyltrioctylammonium bis(trifluorosulfonylimide). [Explanation of Symbols]

[0179] 1. Polarizing film with adhesive layer 11-piece protective polarizing film a polarizer b Protective film c conductive layer d transparent layer 21 Adhesive layer 2. Missing part (irregular shape) W1 Length of the missing part Maximum depth of the chip from D W1 θ1 Angle between two straight lines R1 is the radius of curvature of the curve. 11, 12 First and second polarizing films 21, 22 1st and 2nd adhesive layer 3. Liquid crystal layer 41, 42 1st, 2nd transparent substrate 5. Touch sensor section 6. Drive electrode and sensor section 7. Driving electrode C Liquid Crystal Cell

Claims

1. A polarizing film with an adhesive layer having a polarizer, a polarizing film having a protective film on one or both sides of the polarizer, a conductive layer, and an adhesive layer in this order, The aforementioned polarizing film with adhesive layer has irregularly shaped portions other than rectangular, The polarizing film with an adhesive layer is characterized in that the adhesive layer is formed from an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B).

2. The polarizing film with an adhesive layer according to claim 1, characterized in that the conductive layer contains a conductive polymer.

3. The polarizing film with an adhesive layer according to claim 1 or 2, characterized in that the thickness of the conductive layer is 1 μm or less.

4. The polarizing film with an adhesive layer according to any one of claims 1 to 3, characterized in that the ionic compound (B) has a molecular weight of cation component of 210 or less.

5. The polarizing film with an adhesive layer according to claim 4, characterized in that the aforementioned cationic component is a lithium ion.

6. The polarizing film with an adhesive layer according to any one of claims 1 to 5, characterized in that it contains 0.1 to 10 parts by weight of the ionic compound (B) per 100 parts by weight of the (meth)acrylic polymer (A).

7. The polarizing film with an adhesive layer according to any one of claims 1 to 6, characterized in that the protective film is selected from one of a cellulose resin film and a (meth)acrylic resin film.

8. The polarizing film with an adhesive layer according to any one of claims 1 to 7, characterized in that the thickness of the polarizer is 10 μm or less.

9. The polarizing film is a polarizer and a single-protection polarizing film having a protective film on only one side of the polarizer, as described in any one of claims 1 to 8.

10. The polarizing film with adhesive layer according to claim 9, characterized in that the polarizer protective polarizing film has the conductive layer on the other side of the polarizer.

11. The polarizing film with an adhesive layer according to any one of the 10, characterized in that the conductive layer is provided on the other side of the polarizer in the protective polarizing film via a transparent layer with a thickness of 10 μm or less that is directly formed on the polarizer.

12. The polarizing film with an adhesive layer according to claim 11, characterized in that 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 polyhydric alcohol.

13. The polarizing film with an adhesive layer according to any one of claims 1 to 12, characterized in that the adhesive layer has a creep value of 120 μm or less at 85°C.

14. An image display panel characterized by having an adhesive layer-coated polarizing film as described in any one of claims 1 to 13.

15. The image display panel according to claim 14, characterized in that the adhesive layer of the polarizing film with adhesive layer is bonded to a liquid crystal cell with a built-in touch sensing function having a liquid crystal layer and a touch sensor portion.

16. An image display device characterized by having an image display panel according to claim 14 or 15.

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