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

Abstract

This invention relates to a polarizing film with an adhesive layer, comprising a polarizing film and an adhesive layer. The polarizing film has a polarizing element and a protective film located on one or both sides of the polarizing element. The polarizing film with the adhesive layer has irregularly shaped portions other than rectangular. The adhesive layer is formed from an adhesive composition containing a (meth)acrylic acid polymer (A) and an ionic compound (B) with a cationic component and a molecular weight of 210 or less. Even when applied to an integrated liquid crystal panel, the polarizing film with the irregularly shaped adhesive layer of this invention can suppress the generation of irregular cracks and suppress electrostatic unevenness.

Description

Polarizing film with adhesive layer, image display panel and image display device The present invention relates to a polarizing film with an adhesive layer having a non-rectangular portion, and to an image display panel and an image display device using the polarizing film with an adhesive layer. For example, in the case of image display panels, such as liquid crystal panels used in liquid crystal display devices, polarizing films are usually laminated on both sides of the liquid crystal unit through adhesive layers. The liquid crystal unit is formed by a liquid crystal layer arranged between a pair of transparent substrates. On the other hand, when manufacturing the image display panel, when the polarizing film with the adhesive layer is attached to the liquid crystal unit, a release film is peeled off from the adhesive layer of the polarizing film with the adhesive layer, and peeling off the release film generates static electricity. The static electricity generated in this way can affect the orientation of the liquid crystal layer inside the liquid crystal display panel, for example, resulting in defects. Therefore, for example, by forming an antistatic layer (conductive layer) on the outside of the polarizing film, the generation of static electricity can be suppressed. For example, Patent Document 1 proposes that in a liquid crystal display device with a touch sensing function, a layer having a surface resistance of 1.0×10 9 ~1.0×10 11 Polarizing films with an antistatic layer of Ω / □ can reduce the occurrence of display defects or malfunctions. In addition, it is also known that adding ionic compounds as antistatic agents to the adhesive layer can suppress the generation of static electricity. Meanwhile, in recent years, smartphones and car navigation systems have seen an increase in the use of irregularly shaped built-in liquid crystal displays, and polarizing films have also been used to match these displays. Patent Document 2 discloses a method for processing polarizing film to produce irregular shapes other than rectangular. Patent Document 3 discloses a method for improving the irregular punching properties of the polarizing film and the crack resistance of the irregularly shaped polarizing film after thermal cycling testing by incorporating irregularly shaped inorganic particles into the transparent protective film used for the polarizing film. Prior Art Documents Patent Documents Patent Document 1: Japanese Patent Application Publication No. 2013-105154 Patent Document 2: Japanese Patent Application Publication No. 2017-151191 Patent Document 3: Japanese Patent Application Publication No. 2017-097111 SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION According to the polarizing film with an antistatic layer described in Patent Document 1, the generation of static electricity can be suppressed. However, even the polarizing film with an adhesive layer provided with an antistatic layer or an adhesive layer containing an ionic compound cannot fully suppress static unevenness. As for the polarizing film with an adhesive layer provided with an antistatic layer or an adhesive layer containing an ionic compound, the polarizing film with an adhesive layer provided with an antistatic layer or an adhesive layer containing an ionic compound cannot fully suppress the irregular cracks generated in the irregular portion. It is known that, in particular, when the polarizing film with an adhesive layer containing an ionic compound and having an irregular portion is applied to a built-in liquid crystal panel, a large amount of ionic compounds needs to be added to the aforementioned adhesive layer, which results in the worsening of the irregular cracks generated in the irregular portion. The present invention aims to provide a polarizing film with an adhesive layer having antistatic properties, wherein the polarizing film has an adhesive layer with a shaped portion and can suppress the generation of shaped cracks and static unevenness even when used in built-in liquid crystal panels. Furthermore, an object of the present invention is to provide an image display panel and an image display device using the polarizing film with the adhesive layer. Means for Solving the Problems The present inventors have diligently studied to solve the aforementioned problems and have discovered the following polarizing film with an adhesive layer, thereby completing the present invention. That is, the present invention relates to a polarizing film with an adhesive layer, which comprises a polarizing film and an adhesive layer, wherein the polarizing film comprises a polarizing element and a protective film located on one or both sides of the polarizing element; the polarizing film with an adhesive layer is characterized in that: the polarizing film with an adhesive layer comprises a non-rectangular portion; the adhesive layer is formed by an adhesive composition comprising a (meth)acrylic polymer (A) and an ionic compound (B) having a cationic component and a molecular weight of 210 or less. In the polarizing film with an adhesive layer, the cationic component is preferably a lithium ion. The polarizing film with an adhesive layer preferably contains 0.1 to 13 parts by weight of the ionic compound (B) based on 100 parts by weight of the (meth)acrylic polymer (A). In the aforementioned polarizing film with an adhesive layer, the aforementioned protective film is preferably selected from any one of a cellulose resin film and a (meth)acrylic resin film. Furthermore, the thickness of the aforementioned polarizer in the aforementioned polarizing film is preferably less than 10 μm. The polarizing film with an adhesive layer may be a single-sided protected polarizing film having a polarizer and a protective film on only one side of the polarizer. The single-sided protected polarizing film preferably has the adhesive layer on the other side of the polarizer. The single-sided protective polarizing film may include the adhesive layer on the other side of the polarizer, separated by a transparent layer. The transparent layer is formed directly on the polarizer and has a thickness of 10 μm or less. The transparent layer may be a cured product containing a urethane prepolymer, which is a reaction product of an isocyanate compound and a polyol. In the polarizing film with an adhesive layer, the adhesive layer preferably has a creep value of 120 μm or less at 85° C. The present invention further relates to an image display panel characterized by comprising the aforementioned polarizing film with an adhesive layer. The image display panel can be applied to a liquid crystal cell with an embedded touch sensor function having a liquid crystal layer and a touch sensor portion, wherein the adhesive layer of the polarizing film with an adhesive layer is attached. The present invention further relates to an image display device, characterized by comprising the aforementioned image display panel. Effects of the Invention: The polarizing film with an adhesive layer of the present invention contains an ionic compound in the adhesive layer, which enhances antistatic performance through the adhesive layer. Furthermore, it is known that the smaller the molecular weight of the cationic component in the ionic compound, the less adverse effect it has on irregular cracks. Therefore, cationic components with a molecular weight of 210 or less are used. It is known that using a lithium salt as the cationic component in the ionic compound is particularly effective in suppressing irregular cracks. Furthermore, from the perspective of suppressing static unevenness, it is known that the smaller the molecular weight of the cationic component, the better. The polarizing film with an adhesive layer of the present invention has irregularly shaped portions other than rectangular. For example, the polarizing film with an adhesive layer of the present invention contains a low-molecular-weight ionic compound as a cationic component in the adhesive layer. Therefore, even if the amount of the ionic compound is reduced, the antistatic function of the adhesive layer can still suppress static unevenness when the polarizing film with an adhesive layer is used in a built-in liquid crystal panel. Furthermore, by reducing the amount of the ionic compound, the occurrence of irregularly shaped cracks can be suppressed. It is also known that the effect of suppressing irregular cracks is beneficial when a single-sided protective polarizing film having a protective film only on one side of the polarizer is used as the polarizing film. Single-sided protective polarizing film is also advantageous from the perspective of thinning and cost reduction. On the other hand, it is known that when a single-sided protective polarizing film is used as a polarizing film, the ionic compounds contained in the adhesive layer may segregate into the polarizer in a humid environment, potentially reducing the antistatic properties of the adhesive layer. As described above, when using a single-sided protective polarizing film, by providing the adhesive layer on the polarizer via a transparent layer, the ionic compounds in the adhesive layer are prevented from directly affecting the polarizer, thereby preventing discoloration of the polarizer's edge in a humid environment. As described above, according to the polarizing film with an adhesive layer of the present invention, a polarizing film with an adhesive layer can be provided, which can suppress the optical reliability degradation of the polarizer even when a single-sided protective polarizing film is used, is thin and has good optical reliability, and has excellent long-term antistatic properties. FIG1 is an example of a polarizing film with an adhesive layer according to the present invention. As shown in FIG1 , the polarizing film with an adhesive layer 1 includes a polarizing film 11 and an adhesive layer 21. FIG2 shows a case where the polarizing film 11 of FIG1 uses a single-sided protective polarizing film 11A having a protective film b only on one side of the polarizer a. The single-sided protective polarizing film 11A has the adhesive layer 21 on the other side of the polarizer a that does not have the protective film b. In addition, although not shown, a single-sided protective polarizing film A2 having a protective film b only on one side of the polarizer a may also be used, which is a laminate of polarizer a / protective film b / adhesive layer 21 in this order. FIG3 shows a case where the single-sided protective polarizing film 11A is used and a transparent layer d is further provided on the other side of the polarizer a. In FIG3 , a transparent layer c and an adhesive layer 21 are provided in this order in the single-sided protective polarizing film 11A. From the perspective of suppressing the increase in the moisture content of the polarizer under a high temperature and high humidity environment, the transparent layer c is preferably provided directly on the polarizer a. <Irregular Shaped Portions> The polarizing film with an adhesive layer of the present invention may have irregularly shaped portions other than rectangular portions. Figure 4 is a top view of an example of a portion having irregularly shaped portions other than rectangular portions. The irregular shape is not particularly limited and may be any shape depending on the application, function, and design of the polarizing film with an adhesive layer. Examples of irregular shapes other than rectangular portions include a rectangular portion having a notch or a through hole. The aforementioned notch portion can be provided at the outer edge of the polarizing film with the adhesive layer. When a plurality of the aforementioned notch portions are provided, they can be of the same shape or of different shapes. The aforementioned notch portions can be provided at least two on one side, or at least one on each of the two sides. Furthermore, the aforementioned notch portion can be provided at one of the four outer corners of the rectangle, or at least two. In addition, the outer corners where the aforementioned notch portion is not provided can be square corners or rounded corners. The aforementioned notch portion can be composed 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 the two short sides of the rectangle. The length of the edge W1 of the notch can be adjusted appropriately depending on the intended use of the polarizing film. For example, W1 is preferably adjusted within a range of approximately 2 to 100 mm. Furthermore, the maximum depth D of the notch 2, measured from the edge W1, is preferably adjusted within a range of approximately 2 to 100 mm. FIG4 shows the case where the angle θ1 formed by the two straight lines forming the shape of the notch 2 is 90°. Angle θ1 should be greater than 90° and less than 180°, and preferably greater than 90° and less than 135°. If angle θ1 falls outside this range, stresses caused by expansion and contraction under severe thermal shock conditions will concentrate on the intersection 4 of the two straight lines, making it more susceptible to cracking. FIG4 shows the curve that forms the shape of the notch 2. The radius of curvature R1 of this curve is 0.2 mm or greater, preferably 1 mm or greater, more preferably 2 mm or greater, more preferably 3 mm or greater, and even more preferably 5 mm or greater. If the radius of curvature R1 is less than 0.2 mm, stresses caused by expansion and contraction under severe thermal shock conditions will concentrate on the curved portion, making it more susceptible to cracking. The through-holes can be provided within the plane of the polarizing film with the adhesive layer attached. If multiple through-holes are provided within the plane of the polarizing film with the adhesive layer attached, they can have the same or different shapes. The through-holes can be formed by straight lines, curved lines, or a combination thereof. Examples of shapes for the through-holes include circles, ellipses (with one or two axes of symmetry), rounded rectangles, quadrilaterals (squares, rectangles), and polygons with five or more corners. Methods for forming the aforementioned irregular portion include, for example, punching, end milling, and laser processing. The aforementioned irregular portion is generally formed by the aforementioned processing after laminating the layers. <Polarizing Film with Adhesive Layer> First, the components constituting the polarizing film with adhesive layer of the present invention will be described. The polarizing film can be a polarizer and a polarizer having a protective film on one or both sides. There are no particular limitations on the polarizer, and various polarizers can be used. Examples include hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and partially saponified films of ethylene-vinyl acetate copolymers, which have been subjected to uniaxial stretching by adsorbing a dichroic substance such as iodine or a dichroic dye, and oriented polyene films such as dehydrated polyvinyl alcohol films or dehydrochlorinated polyvinyl chloride films. Among these, polarizers composed of polyvinyl alcohol films and a dichroic substance such as iodine are particularly suitable. The thickness of these polarizers is not particularly limited, but is generally approximately 80 μm or less. Furthermore, thin polarizers with a thickness of 10 μm or less can be used. From the perspective of achieving thinness, a thickness of 1 to 7 μm is preferred. These thin polarizers offer excellent visibility due to minimal thickness variation, and minimal dimensional change, resulting in superior durability. Furthermore, they can also be thinned as polarizing films, making them ideal from these perspectives. As the material constituting the protective film, a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, etc. can be used. Specific examples of the thermoplastic resin include cellulose resins such as triacetyl cellulose, polyester resins, polyether sulfide resins, polysulfide resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, cyclic polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. In addition, on one side of the polarizer, the protective film is generally attached via an adhesive layer, while on the other side, the protective film can be made of a thermosetting resin or UV curing resin such as a (meth)acrylic resin, urethane resin, acrylic urethane resin, epoxy resin, or silicone resin. The material of the aforementioned protective film (transparent protective film) is preferably cellulose resin or (meth) acrylic resin, from the perspective of being able to control the fluctuation of the surface resistance value of the adhesive layer to be small. In addition, the (meth) acrylic resin is preferably a (meth) acrylic resin having a lactone ring structure. Examples of the (meth) acrylic resin having a lactone ring structure include the (meth) acrylic resin having a lactone ring structure described in Japanese Patent Application Publication No. 2000-230016, Japanese Patent Application Publication No. 2001-151814, Japanese Patent Application Publication No. 2002-120326, Japanese Patent Application Publication No. 2002-254544, Japanese Patent Application Publication No. 2005-146084, etc. Cellulose resin is particularly more effective than (meth) acrylic resin in suppressing irregular cracks and polarizer cracks in the single-sided protection of polarizing films, and is therefore preferred from this perspective. The protective film may also include a retardation film, brightness enhancement film, or diffusion film. Examples of retardation films include those with a front retardation of 40 nm or greater and / or a thickness retardation of 80 nm or greater. The front retardation is typically controlled within the range of 40-200 nm, and the thickness retardation is typically controlled within the range of 80-300 nm. When using a retardation film as a protective film, it can also function as a polarizer protective film, allowing for a thinner film. The surface of the protective film not in contact with the polarizer may be provided with a functional layer such as a hard coating layer, an anti-reflection layer, an anti-adhesion layer, a diffusion layer, or even an anti-glare layer. The protective film and polarizer are laminated via intermediary layers such as an adhesive layer, a pressure-sensitive adhesive layer, and a primer layer. It is desirable that the intermediary layer allows the two to be laminated without an air gap. The protective film and polarizer are preferably laminated via an adhesive layer. As long as the adhesive used to bond the polarizer and protective film is optically transparent, various adhesives such as water-based, solvent-based, hot melt adhesive, free radical curing, and cationic curing can be used without particular limitation. However, water-based adhesives or free radical curing adhesives are more suitable. <Adhesive Layer> The adhesive layer is formed of an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B). The (meth)acrylic polymer (A) contains an alkyl (meth)acrylate as a main monomer unit. (Meth)acrylate refers to acrylate and / or methacrylate, and (meth) in the present invention also has the same meaning. The (meth)acrylate alkyl ester constituting the main skeleton of the (meth)acrylic polymer (A) may be a linear or branched alkyl group having 1 to 18 carbon atoms. Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, cyclohexyl, heptyl, 2-ethylhexyl, isooctyl, nonyl, decyl, isodecyl, dodecyl, isomyristyl, lauryl, tridecyl, pentadecyl, hexadecyl, heptadecyl, and octadecyl. These groups may be used alone or in combination. The average number of carbon atoms in these alkyl groups is preferably 3 to 9. The weight ratio of the aforementioned alkyl (meth)acrylate, as a monomer unit, is preferably 70% by weight or greater based on the weight ratio of all monomers (100% by weight) constituting the (meth)acrylic polymer (A). The weight ratio of the aforementioned alkyl (meth)acrylate can be considered as the remainder of other comonomers. When the weight ratio of the aforementioned alkyl (meth)acrylate is within the aforementioned range, it is preferred to ensure good adhesion. In order to improve adhesion and heat resistance, in addition to the aforementioned alkyl (meth)acrylate monomer units, one or more comonomers having a polymerizable functional group having an unsaturated double bond such as a (meth)acryl group or a vinyl group may be introduced into the aforementioned (meth)acrylic polymer (A) by copolymerization. Examples of the comonomer include functional group-containing monomers such as carboxyl group-containing monomers, hydroxyl group-containing monomers, and amide group-containing monomers. Carboxyl-containing monomers are compounds containing a carboxyl group and a polymerizable unsaturated double bond, such as a (meth)acryl group or a vinyl group, within their structure. Specific examples of carboxyl-containing monomers include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. Of these carboxyl-containing monomers, acrylic acid is preferred from the perspectives of copolymerizability, cost, and adhesive properties. A hydroxyl-containing monomer is a compound containing a hydroxyl group and a polymerizable unsaturated double bond, such as a (meth)acryloyl group or a vinyl group, in its structure. Specific examples of hydroxyl-containing monomers include hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, and 12-hydroxylauryl (meth)acrylate, or (4-hydroxymethylcyclohexyl) methacrylate. From the perspective of durability, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred among the aforementioned hydroxyl-containing monomers, with 4-hydroxybutyl (meth)acrylate being particularly preferred. Carboxyl- and hydroxyl-containing monomers serve as reaction sites for crosslinkers when included in adhesive compositions. These monomers exhibit excellent intermolecular reactivity with crosslinkers, making them suitable for enhancing the cohesiveness and heat resistance of the resulting adhesive layer. Furthermore, carboxyl- and hydroxyl-containing monomers are more ideal for achieving both durability and workability, while hydroxyl-containing monomers are more preferred for workability. The weight ratio of the carboxyl group-containing monomer is preferably 10% by weight or less, and preferably 0.01 to 8% by weight, more preferably 0.05 to 6% by weight, and even more preferably 0.1 to 5% by weight. From the perspective of durability, it is preferred to set the weight ratio of the carboxyl group-containing monomer to 0.01% by weight or more. On the other hand, from the perspective of workability, it is not preferred to exceed 10% by weight. The weight ratio of the hydroxyl-containing monomer is preferably 3% by weight or less, preferably 0.01% to 3% by weight, more preferably 0.1% to 2% by weight, and even more preferably 0.2% to 2% by weight. From the perspective of the cross-linked adhesive layer, durability, or adhesive properties, the weight ratio of the hydroxyl-containing monomer is preferably 0.01% by weight or greater. On the other hand, a weight ratio exceeding 3% by weight is undesirable from the perspective of durability. Amide group-containing monomers are compounds containing an amide group in their structure and containing polymerizable unsaturated double bonds such as (meth)acrylamide and vinyl groups. Specific examples of amide group-containing monomers include (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(meth)acrylamide, N-butyl(meth)acrylamide, N-hexyl(meth)acrylamide, N-hydroxymethyl(meth)acrylamide, N-hydroxymethyl-N-propane(meth)acrylamide, aminomethyl(meth)acrylamide, Examples of suitable monomers include acrylamide monomers such as (methyl)acrylamide, aminoethyl (meth)acrylamide, mercaptomethyl (meth)acrylamide, and mercaptoethyl (meth)acrylamide; N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, and N-(meth)acryloylpyrrolidine; and N-vinyl lactam-containing monomers such as N-vinylpyrrolidone and N-vinyl-ε-caprolactam. Amide-containing monomers are preferred because they can suppress the increase in surface resistance over time (especially in humid environments) and meet durability requirements. They are also preferred because they can suppress irregular cracks. Among amide-containing monomers, N-vinyl lactam-based monomers are particularly preferred because they can suppress the increase in surface resistance over time (especially in a humid environment), meet the durability requirements of the transparent conductive layer (touch sensor layer), and suppress irregular cracks. A high weight ratio of the amide-containing monomer tends to reduce its anchoring properties on the optical film. Therefore, the weight ratio is preferably 10% by weight or less, and more preferably 5% by weight or less. To suppress the increase in surface resistivity over time (especially in humid environments), the weight ratio of the amide-containing monomer is preferably 0.1% by weight or greater. The weight ratio is preferably 0.3% by weight or greater, and more preferably 0.5% by weight or greater. The amide-containing monomer is particularly suitable in relation to the ionic compound (B) contained in the adhesive layer of the present invention. In the adhesive composition used to form the adhesive layer, the presence of an amide group introduced into the side chain of the (meth)acrylic polymer (A) of the base polymer is preferred because the presence of the amide group can suppress the viscosity adjusted by the addition of the ionic compound (B) and maintain it within the desired range even under a humidified environment. It is believed that the presence of the amide group introduced into the side chain of the (meth)acrylic polymer (A) as a functional group of a comonomer can enhance the compatibility between the (meth)acrylic polymer (A) and the ionic compound (B). Furthermore, the presence of amide groups introduced into the side chains of the (meth)acrylic polymer (A) of the base polymer provides excellent durability against both glass and transparent conductive layers (such as ITO layers), preventing peeling and bulging when attached to a liquid crystal panel. Furthermore, satisfactory durability is maintained even in humid environments (after humidity reliability testing). Alternatively, an aromatic ring-containing (meth)acrylate may be used as a comonomer. Aromatic ring-containing (meth)acrylate is a compound containing an aromatic ring structure and a (meth)acryloyl group. Examples of the aromatic ring include a benzene ring, a naphthalene ring, and a biphenyl ring. Specific examples of the aromatic ring-containing (meth)acrylate include 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 nonoxyphenol (meth)acrylate, ethylene oxide-modified cresol (meth)acrylate, phenol ethylene oxide-modified (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, methoxybenzyl (meth)acrylate, chlorobenzyl (meth)acrylate, cresol (meth)acrylate, polystyrene (meth)acrylate, and the like; naphthalene ring-containing (meth)acrylates such as hydroxyethylated β-naphthol acrylate, 2-naphthol ethyl (meth)acrylate, 2-naphthyloxyethyl acrylate, and 2-(4-methoxy-1-naphthyloxy)ethyl (meth)acrylate; and biphenyl (meth)acrylate and the like. From the viewpoint of adhesion and durability, the aromatic ring-containing (meth)acrylate is preferably benzyl (meth)acrylate or phenoxyethyl (meth)acrylate, and particularly preferably phenoxyethyl (meth)acrylate. The weight ratio of the aromatic ring-containing (meth)acrylate is preferably 25% by weight or less, and preferably 3 to 25% by weight, preferably 10 to 22% by weight, and more preferably 14 to 20% by weight. A weight ratio of 3% by weight or greater of the aromatic ring-containing (meth)acrylate is preferred for suppressing display unevenness. On the other hand, if it exceeds 25% by weight, the suppression of display unevenness is insufficient, and durability tends to decrease. Specific examples of other comonomers besides the above include anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; sulfonic acid group-containing monomers such as allylsulfonic acid, 2-(meth)acrylamido-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid, and sulfopropyl (meth)acrylate; and phosphate group-containing monomers such as 2-hydroxyethylacryloyl phosphate. Examples of monomers for modification include alkylaminoalkyl (meth)acrylates such as aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and tertiary butylaminoethyl (meth)acrylate; alkoxyalkyl (meth)acrylates such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate; N-(meth)acryloyloxymethylenesuccinimide or N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, N-(meth)acryloyloxymethylenesuccinimide, and N-(meth)acryloyloxymethylenesuccinimide. Succinimide monomers such as succinyl)acryloyl-8-oxyoctamethylenesuccinimide; maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, or N-phenylmaleimide; iconimide monomers such as N-methyliconimide, N-ethyliconimide, N-butyliconimide, N-octyliconimide, N-2-ethylhexyliconimide, N-cyclohexyliconimide, and N-lauryliconimide. Modifying monomers may also 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 (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, fluoro(meth)acrylate, polysilicone (meth)acrylate, and 2-methoxyethyl acrylate. Further examples include isoprene, butadiene, isobutylene, and vinyl ether. In addition, copolymerizable monomers other than the above-mentioned monomers include silane monomers containing silicon atoms. Examples of silane monomers include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloxydecyltrimethoxysilane, 10-acryloxydecyltrimethoxysilane, 10-methacryloxydecyltriethoxysilane, and 10-acryloxydecyltriethoxysilane. Furthermore, as the comonomer, 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, dipentaerythritol hexa(meth)acrylate, and the like can also be used. Polyfunctional monomers having two or more unsaturated double bonds such as (meth)acryloyl groups or vinyl groups, such as esters of (meth)acrylic acid and polyols, such as esters of (meth)acrylic acid and polyols, such as dipentaerythritol hexa(meth)acrylate and caprolactone-modified dipentaerythritol hexa(meth)acrylate, or polyester (meth)acrylates, epoxy (meth)acrylates, urethane (meth)acrylates, etc., having two or more unsaturated double bonds such as (meth)acryloyl groups or vinyl groups added to the backbone of polyesters, epoxy, urethane, etc. as the same functional groups as the monomer components. The ratio of the aforementioned other comonomers in the (meth)acrylic polymer (A) is preferably about 0 to 10 wt %, more preferably about 0 to 7 wt %, and more preferably about 0 to 5 wt %, based on the weight ratio of all the constituent monomers (100 wt %) of the (meth)acrylic polymer (A). The (meth)acrylic polymer (A) of the present invention generally has a weight average molecular weight of preferably 1 million to 2.5 million. Considering durability, especially heat resistance, the weight average molecular weight is preferably 1.2 million to 2 million. From the perspective of heat resistance, a weight average molecular weight of 1 million or more is preferred. On the other hand, if the weight average molecular weight exceeds 2.5 million, the adhesive tends to harden and peel off easily. In addition, the weight average molecular weight (Mw) / number average molecular weight (Mn), which shows the molecular weight distribution, is preferably 1.8 or more and 10 or less, more preferably 1.8 to 7, and even more preferably 1.8 to 5. If the molecular weight distribution (Mw / Mn) exceeds 10, it is not preferred from the perspective of durability. In addition, the weight average molecular weight and molecular weight distribution (Mw / Mn) are measured by GPC (gel permeation chromatography) and are obtained as values ​​calculated in terms of polystyrene. The (meth)acrylic polymer (A) can be produced by appropriately selecting a known production method such as solution polymerization, bulk polymerization, emulsion polymerization, or various radical polymerization methods. The obtained (meth)acrylic polymer (A) may be any of a random copolymer, a block copolymer, and a graft copolymer. In solution polymerization, the polymerization solvent may be ethyl acetate, toluene, etc. As a specific example of solution polymerization, the reaction may be carried out under a stream of an inert gas such as nitrogen, with the addition of a polymerization initiator, and generally at a temperature of about 50-70°C for about 5-30 hours. The polymerization initiator, chain transfer agent, emulsifier, etc. used in the free radical polymerization are not particularly limited and may be appropriately selected and used. Furthermore, the weight average molecular weight of the (meth)acrylic polymer (A) can be controlled by adjusting the amount of the polymerization initiator and chain transfer agent used and the reaction conditions. The amount used can be appropriately adjusted depending on the type of the initiator and chain transfer agent used. <Ionic compound (B)> The ionic compound (B) contained in the adhesive composition forming the adhesive layer of the present invention is a cationic component having a molecular weight of 210 or less. From the viewpoint of suppressing the occurrence of irregular cracks, the molecular weight of the aforementioned cationic component is preferably 150 or less, and more preferably 110 or less, more preferably 50 or less, and even more preferably 10 or less. The larger the molecular weight of the aforementioned cationic component, the more it will hinder the (meth)acrylic polymers in the adhesive layer from entangled with each other, and tend to soften the physical properties of the adhesive layer. Therefore, the smaller the molecular weight, the less likely the physical properties of the adhesive layer will soften, and the occurrence of irregular cracks can be suppressed. In addition, the smaller the molecular weight of the aforementioned cationic component, the easier it is to reduce the surface resistance value of the adhesive layer and suppress static unevenness, which is also better from this point of view. Furthermore, the aforementioned ionic compound (B) may suitably use an alkali metal salt and / or an organic cation-anion salt. Alkali metal salts may include organic salts and inorganic salts of alkali metals. In addition, the so-called "organic cation-anion salt" in the present invention refers to an organic salt whose cation component is composed of an organic substance, and the anion component may be an organic substance or an inorganic substance. "Organic cation-anion salt" is also called an ionic liquid or an ionic solid. By making the aforementioned adhesive layer contain an ionic compound (B), the surface resistance value of the adhesive layer can be reduced and the generation of static electricity can be suppressed, thereby suppressing the static electricity from disrupting the orientation of the liquid crystal layer and causing light leakage (uneven charging). <Alkali Metal Salt> Alkali metal ions constituting the cationic component of the alkali metal salt include ions of lithium, sodium, and potassium. Among these alkali metal ions, lithium ion is preferred. The anion component of the alkali metal salt can be composed of organic matter or inorganic matter. The anion component constituting the organic salt can be, for example, CH 3COO - CF 3COO - 、CH 3SO 3 - CF 3SO 3 - 、(CF 3SO 2) 3C - 、C 4F 9SO 3 - 、C 3F 7COO - 、(CF 3SO 2)(CF 3CO)N - 、 - O 3S(CF 2) 3SO 3 - PF 6 - 、CO 3 2- Or those represented by the following general formulas (1) to (4): (1): (C n F 2n+1 SO 2) 2N - (However, n is an integer between 0 and 10), (2): CF 2(C m F 2m SO 2) 2N - (However, m is an integer between 1 and 10), (3): - O 3S(CF 2) l SO 3 - (However, l is an integer between 1 and 10), (4): (C p F 2p+1 SO 2)N - (C q F 2q+1 SO 2) (However, p and q are integers of 1 to 10). In particular, anionic components containing fluorine atoms are suitable for use because they can produce ionic compounds with good ion dissociation. The anionic components that constitute inorganic salts can use Cl - Br - , I - 、AlCl 4 - 、Al 2Cl 7 - , BF 4 - PF 6 - , ClO 4 - 、NO 3 - 、AsF 6 - , SbF 6 - 、NbF 6 - 、TaF 6 - 、(CN) 2N - etc. The anion component is preferably (CF 3SO 2) 2N － 、(C 2F 5SO 2) 2N － The (perfluoroalkylsulfonyl)imide represented by the general formula (1) above, especially (CF 3SO 2) 2N － The (trifluoromethanesulfonyl)imide shown is preferred. The organic salts of alkali metals include sodium acetate, sodium alginate, sodium lignosulfonate, sodium toluenesulfonate, LiCF 3SO 3. Li(CF 3SO 2) 2N、Li(CF 3SO 2) 2N、Li(C 2F 5SO 2) 2N、Li(C 4F 9SO 2) 2N、Li(CF 3SO 2) 3C, KO 3S(CF 2) 3SO 3K, LiO 3S(CF 2) 3SO 3K, etc. Among them, LiCF 3SO 3. Li(CF 3SO 2) 2N、Li(C 2F 5SO 2) 2N、Li(C 4F 9SO 2) 2N、Li(CF 3SO 2) 3C is preferred, Li(CF 3SO 2) 2N、Li(C 2F 5SO 2) 2N、Li(C 4F 9SO 2) Fluorine-containing lithium imide salts such as 2N-bis(fluorosulfonyl)imide lithium salts are preferred, with (perfluoroalkylsulfonyl)imide lithium salts being particularly preferred. Other examples include 4,4,5,5-tetrafluoro-1,3,2-ditetrahydrothiazolidine-1,1,3,3-tetraoxide lithium salt. Examples of inorganic salts of alkali metals include lithium perchlorate and lithium iodide. <Organic Cation-Anion Salt> The organic cation-anion salt used in the present invention is composed of a cationic component and an anionic component, wherein the cationic component is organic. Specific examples of the cationic component include pyridinium cations, piperidinium cations, pyrrolidinium cations, cations having a dihydropyrrole skeleton, cations having a pyrrole skeleton, imidazolium cations, tetrahydropyrimidinium cations, dihydropyrimidinium cations, pyrazolium cations, pyrazolinium cations, tetraalkylammonium cations, trialkylsonium cations, and tetraalkylphosphonium cations. For example, Cl can be used as an anion component. - Br - , I - 、AlCl 4 - 、Al 2Cl 7 - , BF 4 - PF 6 - , ClO 4 - 、NO 3 - 、CH 3COO - CF 3COO - 、CH 3SO 3 - CF 3SO 3 - 、(CF 3SO 2) 3C - 、AsF 6 - , SbF 6 - 、NbF 6 - 、TaF 6 - 、(CN) 2N - 、C 4F 9SO 3 - 、C 3F 7COO - 、((CF 3SO 2)(CF 3CO)N - 、 - O 3S(CF 2) 3SO 3 - And those represented by the following general formulas (1) to (4): (1): (C n F 2n+1 SO 2) 2N - (However, n is an integer from 0 to 10), (2): CF 2(C m F 2m SO 2) 2N - (However, m is an integer from 1 to 10), (3): - O 3S(CF 2) l SO 3 - (However, l is an integer from 1 to 10), (4): (C p F 2p+1 SO 2)N - (C q F 2q+1 SO 2) (However, p and q are integers of 1 to 10.) Among them, anionic components containing fluorine atoms are particularly suitable for use because they can provide ionic compounds with good ion dissociation properties. The organic cation-anion salt can be appropriately selected from compounds composed of the above-mentioned cationic components and anionic components. Preferred examples of organic cation-anion salts include methyltrioctylammonium bis(trifluoromethanesulfonyl)imide, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, and ethylmethylimidazolium bis(fluorosulfonyl)imide. Among them, 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide and ethylmethylimidazolium bis(fluorosulfonyl)imide are more preferred. Furthermore, examples of the ionic compound (B) include, in addition to the aforementioned alkali metal salts and organic cation-anion salts, inorganic salts such as ammonium chloride, aluminum chloride, cupric chloride, ferrous chloride, ferric chloride, and ammonium sulfate. When the aforementioned ionic compound (B) is an alkali metal salt, alkali metal ions such as lithium, sodium, and potassium are cationic components with a molecular weight of 210 or less, so alkali metal salts containing such alkali metal ions as cationic components can be preferably used. In particular, from the perspective of compatibility with the adhesive layer, it is preferable that the anionic component of the alkali metal salt is an organic salt of an alkali metal composed of an organic substance. Moreover, the aforementioned alkali metal ion is preferably a lithium ion with the smallest molecular weight. The aforementioned ionic compound (B) is preferably a lithium salt, and an organic salt of lithium is particularly preferred. On the other hand, when the aforementioned ionic compound (B) is an organic cation-anion salt, it is preferable to select a cation component with a molecular weight of 210 or less from the aforementioned examples. In particular, from the perspective of compatibility with the adhesive layer, it is preferable that the anionic component is an organic cation-anion salt. The ratio of the ionic compound (B) in the adhesive composition of the present invention should be appropriately adjusted to satisfy the antistatic properties of the adhesive layer and the sensitivity of the touch panel. For example, to make the surface resistance of the adhesive layer 1.0×10 8 ~1.0×10 12 The range of Ω / □ should be adjusted according to the type of protective film of the polarizing film and the type of liquid crystal panel with built-in touch sensing function. For example, in the built-in liquid crystal panel with built-in touch sensing function shown in Figure 6, the initial surface resistance of the adhesive layer should be controlled within 1×10 8 ~6×10 10 Ω / □ range. In addition, in the semi-built-in type LCD panel with built-in touch sensing function shown in Figure 7 or the top-mounted type LCD panel with built-in touch sensing function shown in Figure 8, the initial surface resistance value of the adhesive layer is preferably controlled within 1×10 10 ~1×10 12 The range is Ω / □. If the amount of the aforementioned ionic compound (B) increases, the ionic compound (B) may precipitate, and thus humidification peeling may occur easily. If the amount of the aforementioned ionic compound (B) increases, the surface resistance value may become too low and the baseline may change (due to the low surface resistance value, malfunction during touch), which may reduce the sensitivity of the touch panel. The ratio of the aforementioned ionic compound (B), for example, relative to 100 parts by weight of the (meth)acrylic polymer (A), is generally preferably 40 parts by weight or less, and preferably 20 parts by weight or less, and preferably 13 parts by weight or less. If it is too little, there is a risk of poor antistatic properties, and if it is too much, there is a risk of reduced touch sensitivity, precipitation of ionic compounds, and worsening humidification peeling of the adhesive. On the other hand, in order to improve the antistatic performance, it is advisable to use 0.1 parts by weight or more of the aforementioned ionic compound (B). Based on this viewpoint, the aforementioned ionic compound (B) is preferably 1 part by weight or more, and more preferably 5 parts by weight or more. The adhesive composition of the present invention may contain a crosslinking agent (C). As the crosslinking agent (C), an organic crosslinking agent or a polyfunctional metal chelate may be used. Examples of organic crosslinking agents include isocyanate crosslinking agents, peroxide crosslinking agents, epoxy crosslinking agents, and imine crosslinking agents. A polyfunctional metal chelate is a compound in which a polyvalent metal is covalently bonded 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 an organic compound that can be covalently bonded or coordinately bonded include oxygen atoms, and examples of organic compounds include alkyl esters, alcohol compounds, carboxylic acid compounds, ether compounds, and ketone compounds. The crosslinking agent (C) is preferably an isocyanate crosslinking agent and / or a peroxide crosslinking agent. The isocyanate crosslinking agent (C) may be a compound having at least two isocyanate groups, for example, aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates, etc., which are commonly used in urethanization reactions. Any peroxide that generates free radical active species upon heating or light irradiation to crosslink the base polymer of the adhesive composition can be used. However, considering workability and stability, peroxides with a 1-minute half-life temperature of 80°C to 160°C are preferred, and peroxides with a temperature of 90°C to 140°C are more preferred. Peroxides that can be used include di(2-ethylhexyl) peroxydicarbonate (1 minute half-life temperature: 90.6°C), di(4-tert-butylcyclohexyl) peroxydicarbonate (1 minute half-life temperature: 92.1°C), di-tert-butyl peroxydicarbonate (1 minute half-life temperature: 92.4°C), tert-butyl peroxyneodecanoate (1 minute half-life temperature: 103.5°C), tert-hexyl peroxypivalate (1 minute half-life temperature: 109.1°C), tert-butyl peroxypivalate (1 minute half-life temperature: 110.3°C), dilauryl peroxide (1 minute half-life temperature: 112.1°C), and di-tert-butyl peroxide (1 minute half-life temperature: 113.1°C). Half-life temperature at 1 minute: 116.4°C), di-n-octyl peroxide (half-life temperature at 1 minute: 117.4°C), 1,1,3,3-tetramethylbutyl peroxy-2-ethylhexanoate (half-life temperature at 1 minute: 124.3°C), di(4-methylbenzyl) peroxide (half-life temperature at 1 minute: 128.2°C), dibenzyl peroxide (half-life temperature at 1 minute: 130.0°C), tert-butyl perisobutyrate (half-life temperature at 1 minute: 136.1°C), 1,1-bis(tert-hexylperoxy)cyclohexane (half-life temperature at 1 minute: 149.2°C), etc. Among them, from the viewpoint of good cross-linking reaction efficiency, di(4-tert-butylcyclohexyl)peroxydicarbonate (1-minute half-life temperature: 92.1°C), dilauryl peroxide (1-minute half-life temperature: 116.4°C), and diphenylformyl peroxide (1-minute half-life temperature: 130.0°C) are particularly suitable for use. The amount of the crosslinking agent (C) used per 100 parts by weight of the (meth)acrylic polymer (A) 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 even more preferably 0.03 to 1 part by weight. If the crosslinking agent (C) is less than 0.01 parts by weight, the adhesive layer may not be sufficiently crosslinked, resulting in insufficient durability or adhesive properties. On the other hand, if the crosslinking agent (C) is greater than 3 parts by weight, the adhesive layer may become too hard, tending to reduce durability. The adhesive composition of the present invention may contain a silane coupling agent (D). By using the silane coupling agent (D), durability can be improved. Specific examples of the silane coupling agent include epoxy-containing silane coupling agents such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2-(3-4-epoxycyclohexyl)ethyltrimethoxysilane; 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane; Silane coupling agents containing amino groups such as silane, 3-triethoxysilyl-N-(1,3-dimethylbutylene)propylamine, and N-phenyl-γ-aminopropyltrimethoxysilane; silane coupling agents containing (meth)acryl groups such as 3-acryloxypropyltrimethoxysilane and 3-methacryloxypropyltriethoxysilane; and silane coupling agents containing isocyanate groups such as 3-isocyanatepropyltriethoxysilane. The silane coupling agents exemplified above are preferably silane coupling agents containing epoxy groups. Furthermore, silane coupling agents (D) can also be used that have multiple alkoxysilyl groups in the molecule. Specifically, examples include X-41-1053, X-41-1059A, X-41-1056, X-41-1805, X-41-1818, X-41-1810, and X-40-2651 manufactured by Shin-Etsu Chemical Co., Ltd. Such silane coupling agents that have multiple alkoxysilyl groups in the molecule are less volatile and have multiple alkoxysilyl groups, so they can effectively improve durability and are more ideal. In particular, when the adherend of the optical film to which the adhesive is attached is a transparent conductive layer (such as ITO, etc.) that is less likely to react with alkoxysilyl groups than glass, the durability is still good. Furthermore, the silane coupling agent that has multiple alkoxysilyl groups in the molecule is preferably one that has an epoxy group in the molecule, and it is even better if there are multiple epoxy groups in the molecule. Silane coupling agents containing multiple alkoxysilyl groups and epoxy groups within the molecule tend to exhibit good durability even when the adherend is a transparent conductive layer (such as ITO). Specific examples of silane coupling agents containing multiple alkoxysilyl groups and epoxy groups include X-41-1053, X-41-1059A, and X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd., with X-41-1056 manufactured by Shin-Etsu Chemical Co., Ltd. being particularly preferred due to its high epoxy group content. The silane coupling agent (D) may be used alone or as a mixture of two or more. The total content of the silane coupling agent (D) is preferably 5 parts by weight or less, 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 most preferably 0.05 to 0.6 parts by weight, based on 100 parts by weight of the (meth)acrylic polymer (A). This amount can improve durability. The adhesive composition of the present invention may also contain other known additives, such as polyether compounds containing reactive silicon groups, polyether compounds of polyalkylene glycols such as polypropylene glycol, colorants, pigment powders, 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, particles, and foils, depending on the intended use. Furthermore, a redox system in which a reducing agent is added may be employed within a controllable range. The amount of such additives is preferably 5 parts by weight or less, more preferably 3 parts by weight or less, and even more preferably 1 part by weight or less, relative to 100 parts by weight of the (meth)acrylic polymer (A). The adhesive layer can be formed by, for example, applying the adhesive composition to a release member that has been subjected to a peeling treatment, drying to remove the polymerization solvent, etc. to form an adhesive layer, and then transferring the adhesive layer to an optical film (polarizing film); or applying the adhesive composition to an optical film (polarizing film), drying to remove the polymerization solvent, etc. to form an adhesive layer on the optical film. Furthermore, one or more solvents other than the polymerization solvent may be added as appropriate during the adhesive application. The thickness of the adhesive layer is not particularly limited, and is, for example, about 1 to 100 μm, preferably 2 to 50 μm, more preferably 2 to 40 μm, and even more preferably 5 to 35 μm. The adhesive layer used in the polarizing film with an adhesive layer of the present invention, from the perspective of application to profiled polarizing films, should preferably have a creep value of 120 μm or less at 85°C, preferably 100 μm or less, more preferably 85 μm or less, and even more preferably 60 μm or less. The lower limit of the creep value is preferably 15 μm or greater, more preferably 30 μm or greater. If the creep value exceeds 120 μm, there is a risk of exacerbating the cracks that may have occurred in the profiled polarizing film, as described in the examples. If the creep value is less than 15 μm, the stress relaxation properties of the adhesive layer will be reduced, and there is a risk of the adhesive layer peeling off during durability testing. <Transparent Layer> The transparent layer will be described in detail below. From the perspectives of thinness and optical reliability, the thickness of the transparent layer is preferably 10 μm or less, preferably 5 μm or less, more preferably 3 μm or less, even more preferably 1.5 μm or less, and even more preferably 1 μm or less. If the transparent layer is too thick, the thickness of the polarizing film will increase, which may reduce the optical reliability of the polarizer. On the other hand, from the perspective of minimizing the fluctuation ratio of the surface resistance value of the adhesive layer, the thickness of the transparent layer is preferably 0.1 μm or more, more preferably 0.2 μm or more, and even more preferably 0.3 μm or more. The material forming the transparent layer can be transparent and can suppress the influence of the adhesive layer on the polarizer. For example, the material can be a material forming a urethane prepolymer (a) containing a reaction product of an isocyanate compound and a polyol. The isocyanate compound is preferably a polyfunctional isocyanate compound, and specifically includes polyfunctional aromatic isocyanate compounds, alicyclic isocyanate compounds, aliphatic isocyanate compounds, or dimers thereof. Examples of the polyfunctional aromatic isocyanate compound include phenylene diisocyanate, 2,4-tolyl isocyanate, 2,6-tolyl diisocyanate, 2,2′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, 4,4′-toluidine diisocyanate, 4,4′-diphenyl ether diisocyanate, 4,4′-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, succinyl diisocyanate, methylene bis-4-phenyl isocyanate, and p-phenylene diisocyanate. Examples of the polyfunctional alicyclic isocyanate compound include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-bisisocyanatomethylcyclohexane, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated stilbene diisocyanate, hydrogenated toluene diisocyanate, and hydrogenated tetramethylstilbene diisocyanate. Examples of the polyfunctional aliphatic isocyanate compound include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, and 2,4,4-trimethylhexamethylene diisocyanate. Examples of the polyfunctional isocyanate compound include tris(6-isocyanatehexyl)isocyanurate and the like having three or more isocyanate groups. Examples of the polyol include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methylene-1,5-pentanediol, 2-butane-2-ethane-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methylene-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerol, trimethylolpropane, pentaerythritol, hexanetriol, and polypropylene glycol. As the aforementioned urethane prepolymer (a), in the present invention, it is preferable to use a rigid structure in which a cyclic structure (benzene ring, cyanurate ring, isocyanurate ring, etc.) accounts for a large proportion in the molecular structure. For example, the aforementioned multifunctional isocyanate compound can be used alone or in combination of two or more. However, from the perspective of suppressing the mixing of moisture into the aforementioned polarizer, an aromatic isocyanate compound is preferred. Other multifunctional isocyanate compounds can also be used in combination with aromatic isocyanate compounds. Among the aromatic isocyanate compounds, the aforementioned isocyanate compound is preferably any one selected from toluene diisocyanate and diphenylmethane diisocyanate. Urethane prepolymer (a) preferably uses trimethylolpropane-tris-tolyl isocyanate or trimethylolpropane-tris-diphenylmethane diisocyanate. The urethane prepolymer (a) is a compound having terminal isocyanate groups and can be obtained, for example, by mixing an isocyanate compound with a polyol and then stirring and reacting them. It is generally preferred to mix the isocyanate compound with the polyol so that the isocyanate groups are in excess relative to the hydroxyl groups of the polyol. Alternatively, the urethane prepolymer (a) may be one in which the terminal isocyanate groups have been provided with protecting groups. Examples of such protecting groups include oximes and lactamides. The isocyanate groups are protected by heating to dissociate the protecting groups from the isocyanate groups, allowing the isocyanate groups to react. The material forming the transparent layer may further contain, in addition to the aforementioned urethane prepolymer (a), a compound (b) having at least two functional groups with active hydrogen atoms reactive with isocyanate groups. Examples of such functional groups with active hydrogen atoms reactive with isocyanate groups include hydroxyl groups and amino groups. The greater the number of active hydrogen atoms in the aforementioned compound (b), the more reactive sites there are with the isocyanate groups of the urethane prepolymer (a), making it easier to form a cured product. Therefore, the number of such functional groups is preferably three or more. Furthermore, the value obtained by dividing the molecular weight of compound (b) by the number of functional groups is preferably not more than 350. By defining the relationship between the molecular weight and the number of functional groups as described above, the reactivity of compound (b) with the isocyanate group of the urethane prepolymer (a) can be ensured. The molecular weight of the compound (b) is preferably 1000 or less. The molecular weight of the compound (b) is preferably 1000 or less from the viewpoint of compatibility when the compound (b) is prepared as a solution with the urethane prepolymer (a) to form a material. Examples of the compound (b) include polyols, polyamines, and compounds having a hydroxyl group and an amino group in the molecule. Examples of the polyol include bifunctional alcohols such as ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, and polypropylene glycol; trifunctional alcohols such as glycerol and trimethylolpropane; and tetrafunctional alcohols such as neopentyltol, hexanetriol, and sorbitol. Other examples include adducts of alkylene oxides (e.g., propylene oxide) added to the above polyols such as polyoxypropylene glycerol ether, polyoxypropylene trimethylolpropane ether, and polyoxypropylene sorbitol ether. Examples of the polyamine include ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, isophoronediamine, dicyclohexylmethane-4,4′-diamine, and dimer diamine. Examples of compounds having hydroxyl groups and amino groups in the molecule include diamines having hydroxyl groups in the molecule, such as 2-hydroxyethylethylenediamine, 2-hydroxyethylpropylenediamine, di-2-hydroxyethylethylenediamine, di-2-hydroxyethylpropylenediamine, 2-hydroxypropylethylenediamine, and di-2-hydroxypropylethylenediamine; and alkanolamines, such as ethanolamine, diethanolamine, and triethanolamine. The compound (b) is preferably a polyol from the viewpoint of preventing deterioration of the optical reliability of the polarizer, and trimethylolpropane is particularly preferred from the viewpoint of reactivity with the urethane prepolymer (a). The forming material contains the urethane prepolymer (a) as a main component. The urethane prepolymer (a) preferably accounts for 50% by weight or more of the solid content of the forming material. The blending ratio of the compound (b) to the urethane prepolymer (a) is preferably 5% by weight or more relative to the total 100% by weight (solid content ratio) of the urethane prepolymer (a) and the compound (b). From the perspective of improving film strength, the blending ratio of the compound (b) is preferably 10% by weight or more. On the other hand, if the blending ratio of the compound (b) increases, the optical reliability of the polarizer may sometimes deteriorate. Therefore, the blending ratio of the compound (b) is preferably 80% by weight or less, and more preferably 50% by weight or less. The aforementioned forming material may further use a reaction catalyst in order to improve the reactivity of the isocyanate group. There is no particular limitation on the reaction catalyst, but it is ideally a tin-based catalyst or an amine-based catalyst. One or more reaction catalysts may be used. The amount of reaction catalyst used is usually 5 parts by weight or less relative to 100 parts by weight of the urethane prepolymer (a). Once the amount of reaction catalyst is too much, the cross-linking reaction speed will become faster and the forming material will foam. However, using the foamed forming material will not provide sufficient adhesion. Generally, when using a reaction catalyst, it is preferably 0.01 to 5 parts by weight, and more preferably 0.05 to 4 parts by weight. A reaction catalyst may be used to increase the reactivity of the isocyanate group. There are no particular restrictions on the reaction catalyst, but a tin-based catalyst or an amine-based catalyst is preferred. One or more reaction catalysts may be used. The amount of reaction catalyst used is generally 5 parts by weight or less relative to 100 parts by weight of the urethane prepolymer. If the amount of reaction catalyst is too high, the crosslinking reaction rate will increase, causing the formed material to foam. However, sufficient adhesion cannot be achieved using the foamed formed material. Generally, when a reaction catalyst is used, it is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 4 parts by weight. Tin catalysts can be either inorganic or organic, with organic catalysts being preferred. Examples of inorganic tin catalysts include stannous chloride and tin chloride. Organic tin catalysts preferably have at least one of the following organic groups: aliphatic or alicyclic groups having a backbone such as a methyl, ethyl, ether, or ester group. Examples include tetra-n-butyltin, tri-n-butyltin acetate, n-butyltin trichloride, trimethyltin hydroxide, dimethyltin dichloride, and dibutyltin dilaurate. Furthermore, there is no particular limitation on the amine catalyst. Examples of organic groups include pyridine, amidine, diazabicycloundecene, and other alicyclic groups. Other examples of amine-based catalysts include triethylamine. Other examples of reaction catalysts other than those mentioned above include cobalt cyclohexane, benzyltrimethylammonium hydroxide, and the like. The aforementioned forming material can generally be used in the form of a solution containing the aforementioned urethane prepolymer (a) and the aforementioned compound (b). The solution can be a solvent-based solution or an aqueous solution such as an emulsion, a colloidal dispersion, or an aqueous solution. There are no particular restrictions on the organic solvent as long as it does not have a functional group having active hydrogen that is reactive with an isocyanate group and can uniformly dissolve the aforementioned urethane prepolymer (a) and the aforementioned compound (b) that constitute the forming material. The organic solvent can be used alone or in combination of two or more. In addition, the aforementioned organic solvent can use different solvents for the aforementioned urethane prepolymer (a) and the aforementioned compound (b), respectively. In this case, the forming material can be prepared by mixing the solutions after each solution is prepared. An organic solvent can be further added to the prepared forming material to adjust the viscosity of the forming material. In addition, when the solvent-based solution is dissolved in an organic solvent, it can also contain the alcohols or water listed below as solvents. Examples of the organic solvent 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 hydrocarbons such as 1,2-dichloroethane; ethers such as methyl tertiary butyl ether; and ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cyclopentanone, and acetylacetone. In addition, when preparing an aqueous solution, alcohols such as n-butanol and isopropanol, or ketones such as acetone may be added. When preparing an aqueous solution, this can be achieved by using a dispersant, or by introducing functional groups with low reactivity with isocyanate groups, such as carboxylates, sulfonates, or quaternary ammonium salts, or water-dispersible components such as polyethylene glycol, into the urethane prepolymer. In addition to the aforementioned urethane prepolymer, materials for forming the transparent layer include cyanoacrylate-based materials, epoxy-based materials, urethane acrylate-based materials, and the like. The formation of the transparent layer can be appropriately selected depending on the type of material used. For example, the transparent layer can be formed by coating the material onto a polarizer, etc., and then curing it, thereby forming a coated layer. Generally, this is achieved by drying the coating at approximately 30-100°C, preferably 50-80°C, for approximately 0.5-15 minutes to form a cured layer. Furthermore, when the material contains an isocyanate component, an annealing treatment at approximately 30-100°C, preferably 50-80°C, for approximately 0.5-24 hours may be performed to promote the reaction. <Image Display Panel, Image Display Device> The polarizing film with an adhesive layer of the present invention can be used in various image display panels, and the image display panel can be used in conventional image display devices. The image display device has the same other components as 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), and field emission displays (FEDs). The polarizing film with an adhesive layer of the present invention has a small variation ratio of surface resistance and is suitable for use in liquid crystal panels with built-in touch sensing functions. Furthermore, in addition to the above-mentioned configuration, optical films such as a phase difference film, a viewing angle compensation film, and a brightness enhancement film may be appropriately provided in the liquid crystal panel. The liquid crystal layer is not particularly limited, and any type, such as TN, STN, π, VA, or IPS, can be used. The transparent substrate 9 (on the light source side) is not particularly limited in material as long as it is transparent, and examples thereof include glass and transparent resin film substrates. Examples of the transparent resin film substrate include those mentioned above. Furthermore, on the light source side facing the liquid crystal layer, a polarizing film with an adhesive layer conventionally used in the art can be used, and those described in this specification can also be suitably used. Specific examples of the aforementioned LCD panel with built-in touch sensing functionality are shown in Figures 6 through 8 . Figures 6 through 8 illustrate the polarizing film with an adhesive layer according to the present invention, with the polarizing film 1 with an adhesive layer shown in Figure 1 being used on the viewing side of the liquid crystal cell. That is, the single-sided protective polarizing film 11 and adhesive 21 in Figure 1 are represented as the first polarizing film 11 and the first adhesive layer 21 in Figures 6 through 8 . Figure 6 shows a so-called built-in type liquid crystal panel with in-cell touch sensing functionality. The structure, from the viewing side, comprises: first polarizing film 11 / first adhesive layer 21 / first transparent substrate 41 / touch sensor portion 5 / liquid crystal layer 3 / drive electrode / sensor portion 6 / second transparent substrate 42 / second adhesive layer 22 / second polarizing film 12. In the built-in type liquid crystal panel with in-cell touch sensing functionality shown in Figure 6, for example, liquid crystal cell C includes the touch sensor portion 5 and the drive electrode / sensor portion 6 within the first and second glass substrates 41 and 42 sandwiching the liquid crystal layer 3 (inside the liquid crystal cell). FIG7 shows a modified example of a so-called built-in (semi-built-in) LCD panel with an in-cell touch sensor function. The structure, from the viewing side, comprises: first polarizing film 11 / first adhesive layer 21 / touch sensor portion 5 / first transparent substrate 41 / liquid crystal layer 3 / drive electrode / sensor portion 6 / second transparent substrate 42 / second adhesive layer 22 / second polarizing film 12. In the built-in LCD panel with an in-cell touch sensor function shown in FIG7 , for example, the liquid crystal cell C is located outside the first transparent substrate 41, the touch sensor portion 5 is in direct contact with the first adhesive layer 21, and the liquid crystal cell C has the drive electrode / sensor portion 6 on the second transparent substrate 42 side within the first and second glass substrates 41 and 42 sandwiching the liquid crystal layer 3 (inside the liquid crystal cell). FIG8 shows a so-called top-mounted in-cell touch sensing liquid crystal panel, which has the following structure (from the viewing side): first polarizing film 11 / first adhesive layer 21 / touch sensor portion 5 / drive electrode / sensor portion 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 top-mounted in-cell touch sensing liquid crystal panel shown in FIG8 , for example, liquid crystal cell C has the touch sensor portion 5 and the drive electrode / sensor portion 6 on the outside of the first transparent substrate 41. The touch sensor portion 5 is in direct contact with the first adhesive layer 21. Furthermore, liquid crystal cell C has the drive electrode 7 on the second transparent substrate 42 side within the first and second glass substrates 41 and 42 sandwiching the liquid crystal layer 3 (inside the liquid crystal cell). In a liquid crystal panel with an embedded touch sensor function, when the touch sensor portion 5 of the liquid crystal cell C directly contacts the first adhesive layer 21, the antistatic properties of the first adhesive layer 21 (containing an ionic compound) are easily degraded, especially in a humid environment. Therefore, the liquid crystal panel with an embedded touch sensor function of the present invention is suitable for use in the aforementioned example of an embedded touch sensor function, such as the in-cell type (variant) shown in FIG. 7 or the top-mounted type liquid crystal panel with an embedded touch sensor function, such as FIG. 8 . Furthermore, the first polarizing film 11 disposed on the viewing side of the liquid crystal cell C and the second polarizing film 12 disposed on the opposite side of the viewing side can be layered with other optical films based on the suitability of each configuration location. Examples of the aforementioned other optical films include reflective or transmissive plates, phase difference films (including 1 / 2 or 1 / 4 wavelength plates), viewing angle compensation films, brightness enhancement films, and the like, which can be used to form optical layers of liquid crystal displays. One or more layers of these films can be used. When using these other optical films, the adhesive layer closest to the liquid crystal layer 3 is preferably used as the aforementioned first adhesive layer 21. The liquid crystal layer 3 of the liquid crystal cell C can be a liquid crystal layer containing liquid crystal molecules aligned parallel to each other in the absence of an electric field, as used in liquid crystal panels with built-in touch sensing functionality. An IPS-type liquid crystal layer is suitable for use in liquid crystal layer 3. Alternatively, liquid crystal layer 3 can be any type of liquid crystal layer, such as TN-type, STN-type, π-type, or VA-type. The thickness of the liquid crystal layer is, for example, approximately 1.5 μm to 4 μm. In the liquid crystal cell C, a first transparent substrate 41 and a second transparent substrate 42 can sandwich the aforementioned liquid crystal layer 3 to form the liquid crystal cell. A touch sensor portion 5, a drive electrode / sensor portion 6, drive electrodes 7, and the like can be formed inside or outside the liquid crystal cell, depending on the configuration of the liquid crystal panel with built-in touch sensing functionality. Furthermore, a color filter substrate can be provided on the liquid crystal cell (first transparent substrate 41). The transparent substrate can be made of materials such as glass or polymer films. Examples of polymer films include polyethylene terephthalate, polycycloolefins, and polycarbonates. When the transparent substrate is made of glass, its thickness is, for example, approximately 0.3 mm to 1 mm. When the transparent substrate is made of a polymer film, its thickness is, for example, approximately 10 μm to 200 μm. The transparent substrate may have an adhesive layer or a hard coating layer on its surface. The touch sensor portion 5 (capacitive sensor), the drive electrode / sensor portion 6, and the drive electrode 7 are formed as a transparent conductive layer. The material constituting the aforementioned transparent conductive layer is not particularly limited, and examples thereof include metals such as gold, silver, copper, platinum, palladium, aluminum, nickel, chromium, titanium, iron, cobalt, tin, magnesium, and tungsten, as well as alloys thereof. Furthermore, the material constituting the aforementioned transparent conductive layer includes metal oxides of indium, tin, zinc, gallium, antimony, zirconium, and cadmium. Specifically, examples include metal oxides composed of indium oxide, tin oxide, titanium oxide, cadmium oxide, and mixtures thereof. Other metal compounds such as copper iodide can also be used. The aforementioned metal oxides may further contain oxides of the metal atoms listed in the above groups, as needed. For example, indium oxide containing tin oxide (ITO) and tin oxide containing antimony are preferably used, with ITO being particularly preferred. ITO preferably contains 80-99% by weight of indium oxide and 1-20% by weight of tin oxide. There are no restrictions on where the touch sensor layer 5 is formed in the liquid crystal cell C; it can be formed to suit the form of the liquid crystal panel with built-in touch sensing functionality. For example, Figures 6 to 8 illustrate a case where the touch sensor layer 5 is disposed between the first polarizing film 11 and the liquid crystal layer 3. The touch sensor layer 5 can be formed, for example, on the first transparent substrate 41 as a transparent electrode pattern. Regarding the drive electrode / sensor portion 6 and the drive electrode 7, a transparent electrode pattern can be formed using conventional methods to suit the form of the liquid crystal panel with built-in touch sensing functionality. The transparent electrode pattern is typically electrically connected to a wire (not shown) formed at the end of the transparent substrate, which in turn is connected to a controller IC (not shown). Besides comb-shaped, the transparent electrode pattern can have any shape, such as stripes or diamonds, depending on the intended application. The height of the transparent electrode pattern is, for example, 10 nm to 100 nm, and the width is 0.1 mm to 5 mm. Furthermore, the LCD panel with built-in touch sensing function can be appropriately used as a component of the LCD device such as a backlight or a reflector used in a lighting system. The present invention is further illustrated below using examples, but the present invention is not limited to these examples. In addition, all parts and percentages in each example are by weight. Unless otherwise specified, the room temperature conditions are 23°C and 65% RH. <Measurement of the Weight Average Molecular Weight of the (Meth)Acrylic Acid Polymer (A)> The weight average molecular weight (Mw) of the (meth)acrylic acid polymer (A) was measured by GPC (gel permeation chromatography). Mw / Mn was measured in the same manner. Analyzer: HLC-8120GPC manufactured by Tosoh Corporation Column: G7000H manufactured by Tosoh Corporation XL +GMH XL +GMH XL Column dimensions: 7.8 mm φ × 30 cm (90 cm total) Column temperature: 40°C Flow rate: 0.8 mL / min Injection volume: 100 μL Eluent: Tetrahydrofuran Detector: Differential refractometer (RI) Standard sample: Polystyrene <Production Example 1> (Production of 40μm TAC Film with HC and 25μm TAC Film with HC) To a resin solution (DIC Corporation, trade name: UNIDIC 17-806, solids concentration: 80%) containing a UV-curable resin monomer or oligomer primarily composed of urethane acrylate dissolved in butyl acetate, 5 parts of a photopolymerization initiator (BASF Corporation, trade name: IRGACURE 907) and 0.1 parts of a leveling agent (DIC Corporation, trade name: GRANDIC PC4100) were added per 100 parts of the solids in the solution. Furthermore, cyclopentanone and propylene glycol monomethyl ether were added to the solution at a ratio of 45:55 to achieve a solids concentration of 36%, thereby producing a hard coat layer forming material. The prepared hard coating material was applied to a TJ40UL (Fujifilm, raw material: triacetyl cellulose polymer, thickness: 40 μm) film so that the cured hard coating had a thickness of 7 μm. The film was then dried at 90°C for 1 minute and irradiated with a high-pressure mercury lamp at a cumulative light intensity of 300 mJ / cm. 2 The coating was cured by ultraviolet light to form a hard coating layer (HC), producing a 40μm TAC film with HC. A 7μm-thick hard coating layer (HC) similar to the above was formed on a TJ25UL (Fuji Film, made from triacetylcellulose polymer, thickness: 25μm) in the same manner, producing a 25μm TAC film with HC. <Production Example 2> (Preparation of a 30 μm acrylic film) Into a 30 L autoclave reactor equipped with a stirrer, a temperature sensor, a cooling tube, and a nitrogen inlet tube, 8,000 g of methyl methacrylate (MMA), 2,000 g of methyl 2-(hydroxymethyl)acrylate (MHMA), 10,000 g of 4-methyl-2-pentanone (methyl isobutyl ketone, MIBK), and 5 g of n-dodecyl mercaptan were charged. The temperature was raised to 105° C. and refluxed while nitrogen was passed through the reactor. Then, 5.0 g of tertiary butyl peroxyisopropyl carbonate (Kayakarubon BIC-7, KAYAKU AKZO CO., LTD.) as a polymerization initiator, a solution consisting of 10.0 g of tertiary butyl peroxyisopropyl carbonate and 230 g of MIBK was simultaneously added dropwise over 4 hours. Solution polymerization was carried out at approximately 105-120°C under reflux, followed by aging for an additional 4 hours. To the resulting polymer solution was added 30 g of a mixture of octadecyl phosphate and dioctadecyl phosphate (Phoslex A-18, manufactured by Sakai Chemical Industry Co., Ltd.), and a cyclization condensation reaction was carried out at approximately 90-120°C under reflux for 5 hours. The resulting polymer solution was then introduced into a vented twin-screw extruder (φ = 29.75 mm, L / D = 30) at a processing rate of 2.0 kg / h, calculated based on the resin mass. Cyclization condensation and devolatilization were further carried out within the extruder, followed by extrusion to produce transparent pellets of the lactone ring-containing polymer. The vented twin-screw extruder had a barrel temperature of 260°C, a rotational speed of 100 rpm, a reduced pressure of 13.3-400 hPa (10-300 mmHg), one rear vent, and four front vents. Dynamic TG analysis of the resulting lactone ring-containing polymer revealed a mass loss of 0.17% by mass. The 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 pellets were kneaded and extruded with acrylonitrile-styrene (AS) resin (TOYO AS AS20, manufactured by TOYO STYRENE CO., LTD.) at a mass ratio of 90 / 10 using a uniaxial extruder (screw 30 mmφ) to obtain transparent pellets. The glass transition temperature of the pellets was 127°C. The pellets were melt-extruded from a 400 mm wide coat hanger T-die using a 50 mmφ uniaxial extruder to produce a film with a thickness of 120 μm. The film was stretched longitudinally to 2.0 times and transversely to 2.0 times at a temperature of 150°C using a biaxial stretching device to obtain a stretched film (30 μm acrylic film) with a thickness of 30 μm. The optical properties of the 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. <Preparation of polarizing film (1)> A polyvinyl alcohol film of 45 μm in thickness was dyed in a 0.3% iodine solution at 30°C for 1 minute between rollers of different speed ratios and stretched to 3 times. Thereafter, the film was immersed in an aqueous solution containing 4% boric acid and 10% potassium iodide at 60°C for 0.5 minutes while being stretched to a total stretching ratio of 6 times. Subsequently, the film was immersed in an aqueous solution containing 1.5% potassium iodide at 30°C for 10 seconds to be cleaned, and then dried at 50°C for 4 minutes to obtain a polarizing element of 18 μm in thickness. A 40 μm TAC film (triacetyl cellulose film side) with HC attached and saponified obtained in Production Example 1 was bonded to one side of the polarizing element using a polyvinyl alcohol-based adhesive, and a 30 μm acrylic film obtained in Production Example 2 was bonded to the other side to produce a polarizing film (1). <Preparation of polarizing film (2)> (Preparation of thin polarizing element A) A single side of an amorphous isophthalic acid copolymer polyethylene terephthalate (IPA copolymer PET) film substrate (thickness: 100 μm) with a water absorption of 0.75% and a Tg of 75°C was subjected to corona treatment, and an aqueous solution containing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol %) and acetyl acetyl-modified PVA (polymerization degree 1200, acetyl acetyl modification degree 4.6%, saponification degree 99.0 mol % or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "Gohsefimer Z200") in a ratio of 9:1 was coated on the corona-treated surface at 25°C and dried to form a PVA-based resin layer with a thickness of 11 μm, thereby producing a laminate. The obtained laminate is subjected to free-end uniaxial stretching of 2.0 times in the longitudinal direction (long side direction) between rollers of different circumferential speeds in an oven at 120°C (in-air auxiliary stretching treatment). Next, the laminate is immersed in an insolubilizing bath (a boric acid aqueous solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 30°C for 30 seconds (insolubilization treatment). Next, while being immersed in a dyeing bath at a liquid temperature of 30°C, the iodine concentration and the immersion time are adjusted so that the polarizing plate has a predetermined transmittance. In this embodiment, it is immersed in an iodine aqueous solution obtained by mixing 0.2 parts by weight of iodine and 1.0 parts by weight of potassium iodide with 100 parts by weight of water for 60 seconds (dyeing treatment). Next, it is immersed in a cross-linking bath (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) at a liquid temperature of 30°C for 30 seconds (cross-linking treatment). The laminate was then immersed in a boric acid aqueous solution at a temperature of 70°C (an aqueous solution prepared by adding 4 parts by weight of boric acid and 5 parts by weight of potassium iodide to 100 parts by weight of water) while being uniaxially stretched in the longitudinal direction (longitudinal direction) between rollers of varying circumferential speeds to a total stretch ratio of 5.5 (underwater stretching). The laminate was then immersed in a cleaning bath at a temperature of 30°C (an aqueous solution prepared by adding 4 parts by weight of potassium iodide to 100 parts by weight of water) (cleaning treatment). In this manner, an optical film laminate including a polarizer having a thickness of 5 μm was obtained. (Preparation of an adhesive for 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 a (meth)acrylic acid monomer (ARUFON UP1190, 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.). <Preparation of Polarizing Film (2)> The surface of the polarizer A of the optical film laminate was coated with the aforementioned UV-curable adhesive so that the cured adhesive layer had a thickness of 1 μm. The 25 μm TAC film with HC obtained in the above-mentioned Manufacturing Example 1 (on the triacetylcellulose film side) was then attached. The adhesive was then cured by irradiation with ultraviolet light as active energy rays. Ultraviolet light irradiation was performed using a gallium-filled metal halide lamp. The irradiation device was Light HAMMER 10 manufactured by Fusion UV Systems, Inc., with a V bulb and a peak illuminance of 1600 mW / cm 2 , cumulative exposure 1000 / mJ / cm 2 (wavelength 380-440nm), and the ultraviolet irradiance was measured using the Sola-Check system manufactured by Solatell. The amorphous PET substrate was then peeled off to produce a polarizing film (2) using a thin polarizer. The optical properties of the resulting polarizing film were a single-unit transmittance of 42.8% and a polarization degree of 99.99%. <Preparation of a polarizing film with a transparent layer (2)> After coating the following transparent layer forming material on the surface of the polarizing element of the above-mentioned polarizing film (2) (the surface of the polarizing element not provided with the 25μm TAC film with HC) using a rod coater, heat treatment is performed at 60°C for 12 hours to form a urethane resin layer with a thickness of 3μm, thereby preparing a polarizing film with a transparent layer (2). The urethane prepolymer (a) solution was a 75% ethyl acetate solution of a urethane prepolymer composed of toluene diisocyanate (TDI) and trimethylolpropane (TMP) (Tosoh Corporation, trade name "CORONATE L"). Separately, a trimethylolpropane solution was prepared by dissolving trimethylolpropane in cyclopentanone to a solids concentration of 10%. The trimethylolpropane solution was added to 100 parts of a 75% ethyl acetate solution of the urethane prepolymer (manufactured by Tosoh Corporation, trade name "Coronate L") to adjust the solid content ratio of the urethane prepolymer to trimethylolpropane to 90:10. 0.1 part of a dioctyltin dilaurate catalyst (manufactured by Tokyo Fine Chemical Co., Ltd., trade name "EMBILIZER OL-1") was then added, and methyl isobutyl ketone was added as a solvent to prepare a forming material (coating solution) having a solid content concentration of 10%. Example 1 (Preparation of Acrylic Polymer (A)) A monomer mixture containing 78.9 parts of butyl acrylate, 16 parts of phenoxyethyl acrylate, 5 parts of acrylic acid, and 0.1 part of 4-hydroxybutyl acrylate was added to a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen inlet tube, and a cooler. Furthermore, 0.1 parts of 2,2'-azobisisobutyronitrile (a polymerization initiator) and 100 parts of ethyl acetate were added to 100 parts of the monomer mixture (solid content). After nitrogen substitution with gentle stirring and the introduction of nitrogen gas, the liquid temperature in the flask was maintained at approximately 55°C. A polymerization reaction was conducted for 8 hours, resulting in a solution of an acrylic polymer having a weight-average molecular weight (Mw) of 2.2 million and an Mw / Mn ratio of 4.0. (Preparation of Adhesive Composition) An acrylic adhesive solution was prepared by mixing 100 parts of the solid content of the acrylic polymer solution obtained above with 10 parts of lithium bis(trifluoromethanesulfonyl)imide, 0.6 parts of an isocyanate crosslinking agent (Coronate L, trimethylolpropane diisocyanate, manufactured by Tosoh Corporation), 0.1 parts of benzoyl peroxide (NYPER BMT, manufactured by NOF Corporation), and 0.3 parts of an epoxy group-containing silane coupling agent (X-41-1056, manufactured by Shin-Etsu Chemical Co., Ltd.). (Preparation of Polarizing Film with Adhesive Layer) Next, the solution of the acrylic adhesive composition was applied to one side of a polyethylene terephthalate film (separator film: MRF38 manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) treated with a silicone release agent so that the thickness of the adhesive layer after drying was 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. Next, the adhesive layer formed on the separator film was transferred to the acrylic film side of the polarizing film (1) prepared above, thereby preparing a polarizing film with an adhesive layer. Examples 2-10 and Comparative Examples 1-2 In Example 1, the types of monomers used to prepare the acrylic polymer (A) and their usage ratios were changed as shown in Table 1, and the production conditions were controlled to prepare the acrylic polymer (A) solutions shown in Table 1. As shown in Table 1, the type of polarizing film, the type of ionic compound (B) used to prepare the adhesive composition, or the blending ratio thereof, was changed to that 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 type of ionic compound (B) used to prepare the adhesive composition, or the blending ratio thereof, was changed to that shown in Table 1. Furthermore, when the aforementioned polarizing film (2) was used as the polarizing film, the adhesive layer described in Table 1 was formed on the polarizer surface of the aforementioned polarizing film (2) (the surface of the polarizer not provided with the 25 μm TAC film with HC attached) in the same manner as described above. When the aforementioned polarizing film (2) with a transparent layer was used as the polarizing film, the adhesive layer described in Table 1 was formed on the transparent layer of the aforementioned polarizing film (2) with a transparent layer in the same manner as described above. The polarizing films with adhesive layers obtained in the above examples, comparative examples, and reference examples were evaluated as follows. The evaluation results are listed in Table 1. <Surface Resistivity (Ω / □): Conductivity> After peeling the separator film from the polarizing film with an adhesive layer, the surface resistance of the adhesive layer was measured and used as the surface resistance of the polarizing film with an adhesive layer. The measurement was performed using an MCP-HT450 manufactured by Mitsubishi Chemical ANALYTECH. <Determination of Creep Value> A 10mm x 10mm section of the upper edge of a polarizing film with an adhesive layer (adhesive layer thickness: 20μm), cut to 10mm x 30mm, was attached to a SUS plate through the adhesive layer and autoclaved at 50°C and 5 atmospheres for 15 minutes. A precision hot plate with the heating surface set vertically was heated to 85°C. The SUS plate with the polarizing film with an adhesive layer attached was then positioned so that the surface not attached to the adhesive layer was in contact with the heated surface of the hot plate. After heating the SUS plate at 85°C for 5 minutes, a 500g load was applied to the lower edge of the polarizing film with an adhesive layer and allowed to stand for 1 hour. The offset between the polarizing film with an adhesive layer and the SUS plate before and after the load was applied was measured, and this offset was used as the creep value (μm) at 85°C. <Durability Test> The polarizing film with an adhesive layer was cut into a size of 300×220 mm with its absorption axis parallel to the long side. The polarizing film with an adhesive layer was bonded to a 350×250 mm×0.7 mm thick alkali-free glass (Corning Incorporated, trade name "EG-XG") using a laminator. Next, the film was autoclaved at 50°C and 0.5 MPa for 15 minutes to ensure that the adhesive layer adhered to the glass. After the treated samples were treated for 500 hours in an 85°C atmosphere and 500 hours in a 60°C / 95% RH atmosphere, the appearance of the samples was visually evaluated according to the following criteria. (Evaluation Criteria) A: No changes in appearance such as bubbling or peeling were observed. B: Although there was some slight peeling or bubbling at the edges, it was not a problem in practical use. C: There is peeling or foaming at the edge, but it is not a problem in practice unless it is used for special purposes. D: There is significant peeling at the edge, which is a problem in practice. <ESD Test> After peeling off the separator film from the polarizing film with an adhesive layer, it is attached to the viewing side of the built-in liquid crystal unit to produce a liquid crystal panel with built-in touch sensing function. That is, the polarizing film with an adhesive layer is attached to the first transparent substrate of the built-in liquid crystal unit shown in Figure 6 to form the first adhesive layer and the first polarizing film. The polarizing film of the aforementioned liquid crystal panel is subjected to an ESD (electrostatic discharge) gun (10kV) to measure the time it takes for the whitened part to disappear due to electrical discharge, and the evaluation is based on the following criteria. (Evaluation Criteria) A: Within 1 second. B: More than 1 second and within 10 seconds. C: More than 10 seconds. <Evaluation of irregular cracks> The polarizing film with adhesive layer was 2. A Spirit laser processing machine (GCC, 30W) was used at a speed of 10, a laser output of 35, and 400 ppi to produce the shape shown in Figure 5. The shaped polarizing film with an adhesive layer was then laminated to a 350mm x 250mm x 0.7mm thick piece of alkali-free glass (Corning, trade name "EG-XG") and then autoclaved at 50°C and 0.5 MPa for 15 minutes to bond the adhesive layer to the glass. The treated samples were placed in a thermal cycle test chamber and visually inspected for cracks in the shaped portion at 100 and 200 cycles. Five identical samples were placed under each condition, and the number of cracked samples is reported in Table 1. (Test Conditions) Temperature: Repeated cycle of -40°C (hold for 30 minutes) to 85°C (hold for 30 minutes), with a heating and cooling rate of 10°C / min. <Evaluation of Edge Fading> The single-sided (or double-sided) polarizing film with adhesive layer obtained in the Examples and Comparative Examples was cut into 50 mm x 50 mm pieces. After removing the separator film, the film was attached to a 1.2-1.5 mm thick alkali glass (manufactured by Matsunami Glass Co., Ltd., slide glass) through the adhesive layer to prepare a sample. After maintaining the sample in a high-temperature, high-humidity environment at 60°C and 90% RH for 500 hours, the edge fading was measured using a differential interference microscope (Olympus, product name "MX-61L") under the following conditions. The edge fading was calculated by measuring the distance (μm) between the point closest to the center of the sample where the color becomes lighter than the center, and the corner. The average of the four corner values ​​was used as the edge fading for the sample. Apparatus: Olympus MX-61L Measurement Conditions Lens Magnification: 5x ISO: 200 Shutter Speed: 1 / 100 Reflected Light: 0 White Balance: Automatic Transmitted Light Controller: LG-PS2 Transmitted Light: 5 Transmitted Light Polarization Direction: Orthogonal to the polarizing film transmission axis [Table 1] In Table 1, BA represents butyl acrylate, PEA represents phenoxyethyl acrylate, AA represents acrylic acid, NVP represents N-vinyl-2-pyrrolidone, HBA represents 4-hydroxybutyl acrylate, isocyanate represents isocyanate crosslinking agent (CORONATE L manufactured by Tosoh Corporation, trimethylolpropane diisocyanate toluene), BPO represents benzoyl oxide (NYPER BMT manufactured by NOF Corporation), Li-TFSI represents lithium bis(trifluoromethanesulfonyl)imide, K-bis(trifluoromethanesulfonyl)imide potassium, TMPA-TFSI represents trimethylpropylammonium bis(trifluorosulfonylimide), EMP-TFSI represents ethylmethylpyrrolidinium bis(trifluorosulfonylimide), TBMA-TFSI represents tributylmethylammonium bis(fluorosulfonylimide), MTOA-TFSI stands for methyltrioctylammonium bis(trifluorosulfonylimide). 1: Polarizing film with adhesive layer 2: Notch (irregular shape) 3: Liquid crystal layer 4: Intersection of two straight lines 5: Touch sensor 6: Drive electrode and sensor 7: Drive electrode 11: Single-sided protective polarizing film 11A: Single-sided protective polarizing film 12: Second polarizing film 21: (First) adhesive layer 22: Second adhesive layer 41: First transparent substrate 42: Second transparent substrate A2: Single-sided protective polarizing film C: Liquid crystal unit D: Maximum depth of the notch from W1 R1: Curvature radius of the curve W1: Length of the notch a: Polarizer b: Protective film c: Transparent layer θ1: Angle formed by the two straight lines Figure 1 is a cross-sectional view showing an example of a polarizing film with an adhesive layer according to the present invention. Figure 2 is a cross-sectional view showing an example of a polarizing film with an adhesive layer according to the present invention. Figure 3 is a cross-sectional view showing an example of a polarizing film with an adhesive layer according to the present invention. Figure 4 is a top view showing an example of a non-rectangular shaped portion of a polarizing film with an adhesive layer according to the present invention. Figure 5 is a top view showing a polarizing film with an adhesive layer having a shaped portion according to an embodiment of the present invention. Figure 6 is a cross-sectional view showing an example of a liquid crystal panel with a touch sensor function using the polarizing film with an adhesive layer according to the present invention. Figure 7 is a cross-sectional view showing an example of a liquid crystal panel with a touch sensor function using the polarizing film with an adhesive layer according to the present invention. Figure 8 is a cross-sectional view showing an example of a liquid crystal panel with a touch sensor function using the polarizing film with an adhesive layer according to the present invention. 1: Polarizing film with adhesive layer 11:Polarizing film 21: Adhesive layer

Claims

1. A polarizing film with an adhesive layer, comprising a polarizing film and an adhesive layer, the polarizing film having a polarizing element and a protective film located on one or both sides of the polarizing element; characterized in that: the polarizing film with the adhesive layer has irregularly shaped portions other than rectangular; the adhesive layer is formed of an adhesive composition containing a (meth)acrylic polymer (A) and an ionic compound (B) with a molecular weight of 210 or less containing a cationic component; the surface resistivity of the adhesive layer is 1.0 × 10⁸ to 1.0 × 10¹² Ω / □.

2. The polarizing film of the adhesive layer as claimed in claim 1, wherein the aforementioned cationic component is lithium ion.

3. The polarizing film of the adhesive layer of claim 1 or 2 contains 0.1 to 13 parts by weight of the aforementioned ionic compound (B) relative to 100 parts by weight of the aforementioned (meth)acrylic polymer (A).

4. The polarizing film with an adhesive layer as claimed in claim 1 or 2, wherein the aforementioned protective film is selected from either cellulose resin film or (meth)acrylic resin film.

5. A polarizing film with an adhesive layer as claimed in claim 1 or 2, wherein the thickness of the aforementioned polarizing element is 10 μm or less.

6. A polarizing film with an adhesive layer as claimed in claim 1 or 2, wherein the aforementioned polarizing film is a single-sided protective polarizing film having a polarizing element and a protective film on only one side of the aforementioned polarizing element.

7. The polarizing film with an adhesive layer as claimed in claim 6, wherein the aforementioned single-sided protective polarizing film has the aforementioned adhesive layer on the other side of the aforementioned polarizing element.

8. The polarizing film with an adhesive layer as claimed in claim 7, wherein the adhesive layer is present on the other side of the aforementioned polarizing element in the aforementioned single-sided protective polarizing film, with a transparent layer in between, the transparent layer being formed directly on the aforementioned polarizing element and having a thickness of 10 μm or less.

9. The polarizing film with an adhesive layer as claimed in claim 8, wherein the aforementioned transparent layer is a hardened form containing a carbamate prepolymer, and the carbamate prepolymer is a reaction product of an isocyanate compound and a polyol.

10. A polarizing film with an adhesive layer as claimed in claim 1 or 2, wherein the creep value of the aforementioned adhesive layer at 85°C is less than 120 μm.

11. An image display panel, characterized in that: a polarizing film having an adhesive layer as claimed in any one of claims 1 to 10.

12. The image display panel of claim 11, wherein a liquid crystal cell having a touch sensing function embedded in a liquid crystal layer and a touch sensor section is bonded with an adhesive layer of the aforementioned polarizing film with an adhesive layer.

13. An image display device, characterized in that it has an image display panel as claimed in claim 11 or 12.

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