TW202309564A - Polarizing film and image display device - Google Patents

Abstract

Provided is a polarizing film in which a transparent protective film is stacked on at least one surface of a polarizer with an adhesive layer therebetween, the polarizing film being characterized in that in at least part of the polarizer, a non-polarizing portion is formed, and a dimensional shrinkage rate X1 of the polarizing film including the non-polarizing portion after the polarizing film is left for 72 hours at 85 DEG C in a humidity environment of 85% is 1.0% or less. H1*d1 ≥ 0.8 is preferable where H1 (GPa) is the hardness of the non-polarizing portion, and d1 is the thickness of the non-polarizing portion. H3*T3 < 50 is preferable where H3 (GPa) is the hardness of the transparent protective film, and T3 (g/m2) is the moisture permeability of the transparent protective film. H2*d2 ≥ 0.20 is preferable where H2 (GPa) is the hardness of a portion abutting on the non-polarizing portion of the adhesive layer, and d2 ([mu]m) is the thickness thereof.

Description

Polarizing film and image display device

The invention relates to a polarizing film, which is laminated with a transparent protective film on at least one side of a polarizing piece through an adhesive. The polarizing film can be used alone or in the form of an optical film laminated to form image display devices such as mobile phones, car navigation devices, personal computer screens, and televisions.

Image display devices such as mobile phones and notebook personal computers (PCs) are equipped with internal electronic components such as sensors. In recent years, due to the rapid spread of smart phones and touch panel information processing devices, it is expected to further improve the performance of sensors. Furthermore, in order to cope with the diversification and high functionality of image display devices, a polarizing film with partial polarizing performance is sought. In order to meet these demands, a polarizer in which a non-polarizing portion formed by chemical treatment is formed in a predetermined portion has been proposed (for example, Patent Documents 1 and 2). prior art literature patent documents

Patent Document 1: Korean Laid-Open Patent No. 10-2015-0086159 Patent Document 2: Japanese Patent Laid-Open No. 2015-215609

The problem to be solved by the invention In recent years, the durability test required for polarizing films used in image display devices such as mobile phones and PCs, especially for image display devices such as mobile phones and PCs with flexible displays, or for automotive applications, has been exposed to high temperatures. Humidification durability test under high humidity, such as exposure to 85°C-85% humidity environment for a predetermined time. Due to the humidity durability test, if the non-polarizing part of the polarizer and the transparent protective film laminated on the polarizer swell, the optical function of the polarizing film may be hindered.

The present invention was developed in view of the above circumstances, and an object of the present invention is to provide a polarizing film having a polarizer having a non-polarizing portion and having excellent optical performance even under high temperature and high humidity, and an image display device.

means to solve problems The above-mentioned problems can be solved by the following constitution. That is, the present invention relates to a polarizing film (1), which is laminated with a transparent protective film on at least one side of the polarizing element through an adhesive layer. part; after being placed in an environment of 85°C-85% humidity for 72 hours, the dimensional shrinkage rate X1 of the polarizing film including the aforementioned non-polarizing part is 1.0% or less. In the present invention, "the dimensional shrinkage rate of the polarizing film" refers to preparing a polarizing film sample with a sample size of 10cm×10cm, and adopting the dimensional shrinkage rate in the MD direction or the TD direction. It is more suitable to use the size in the MD direction with a large dimensional change rate. Shrinkage. In addition, generally speaking, the "MD direction" corresponds to the "absorption axis direction of the polarizer".

As in the aforementioned polarizing film (1), it is preferably a polarizing film (2) in which H1×d1≧0.8 when the hardness of the non-polarizing portion is H1 (GPa) and the thickness of the non-polarizing portion is d1.

Such as the above polarizing film (1) or (2), it is preferably: when the hardness of the aforementioned transparent protective film is H3 (GPa), and the moisture permeability of the aforementioned transparent protective film is T3 (g/m ² ), H3× Polarizing film with T3<50 (3).

As in any one of the above-mentioned polarizing films (1) to (3), it is preferable that the hardness of the part of the aforementioned adhesive layer in contact with the aforementioned non-polarizing portion is H2 (GPa), and the thickness is d2 (µm) ), H2×d2≧0.20 polarizing film (4).

As in any one of the above-mentioned polarizing films (1) to (4), it is preferably a polarizing film in which the thickness of the adhesive layer between the part other than the non-polarizing part of the aforementioned polarizing element and the aforementioned transparent protective film is 2 µm or less ( 5).

Furthermore, the present invention relates to an image display device, characterized in that: it is equipped with a polarizing film as described in any one of (1) to (5), and the aforementioned non-polarizing portion of the polarizing film is arranged in a position corresponding to the sensor portion the location.

Invention effect In recent years, polarizing films used under high temperature and high humidity have been widely used, so as mentioned above, it is important to ensure optical performance even under high temperature and high humidity. If the polarizing film is placed under high temperature and high humidity, for example, if it is placed in an environment of 85°C-85% humidity, the other parts of the polarizer other than the non-polarizing part will easily shrink. In the direction of elongation of the part, it is easy to change the shape of the non-polarizing part. In addition, under high temperature and high humidity, the non-polarizing portion is likely to swell due to the influence of moisture, and the shape of the non-polarizing portion is also prone to change. The polarizing film of the present invention is designed such that the dimensional shrinkage rate X1 of the polarizing film including the non-polarizing part becomes 1.0% or less after being placed in an environment of 85°C-85% humidity for 72 hours. Thereby, the shape change of the non-polarizing part can be suppressed, and as a result, the optical performance of the polarizing film can be excellent even under high temperature and high humidity, and an image display device including the polarizing film can be used for a long period of time.

In particular, in the present invention, the shape change of the non-polarizing portion can be further suppressed under the following conditions: (1) When the hardness of the non-polarizing portion is H1 (GPa), and the thickness of the non-polarizing portion is d1, H1×d1≧0.8 (2) When the hardness of the transparent protective film is H3 (GPa), and the moisture permeability of the transparent protective film is T3 (g/m ² ), when H3×T3<50; and, (3) When the hardness of the portion of the adhesive layer in contact with the non-polarizing portion is H2 (GPa) and the thickness is d2 (µm), when H2×d2≧0.20. As a result, the optical performance of the polarizing film can be improved even under high temperature and high humidity, and an image display device including the polarizing film can be used for a longer period of time.

Embodiments of the present invention will be described below with reference to the drawings. In addition, the ratio of the thickness etc. in a figure is an example and is not limited to this.

FIG. 1 is an example of a schematic cross-sectional view showing a polarizing film according to an embodiment of the present invention. The polarizing film 10 of this embodiment is one in which a transparent protective film 3 is laminated on one side of a polarizer 1 through an adhesive layer 2 . In addition, the present invention may also be one in which a transparent protective film is laminated on both sides of the polarizer through an adhesive layer.

The polarizer 1 is formed with a non-polarizing portion 1A at least in part. The method of forming the non-polarizing portion of the polarizer will be described later. When the non-polarizing part is formed on the polarizer, by this processing method, the processed surface of the non-polarizing part will be more likely to be recessed structurally than other parts of the polarizing part (polarizing part). In the embodiment shown in FIG. 1 , an example in which a concave portion 1 h is formed on the treated surface of the polarizer 1 is shown. In addition, in the embodiment shown in FIG. 1 , it shows an example in which only the processing surface (upper side in the drawing) has the recessed part 1h and there is no recessed part in the lower side of the drawing. The polarizer surface on the opposite side may be slightly concave. In this case, in the present invention, the one with the larger depth of the depression (generally, the depression on the surface side treated to form the non-polarizing portion in the polarizer) is used as the concave portion 1h.

The polarizing film 10 shown in FIG. 1 is designed so that the dimensional shrinkage rate X1 of the polarizing film including the non-polarizing portion 1A becomes 1.0% or less after being placed in an environment of 85°C-85% humidity for 72 hours. As a result, the optical performance of the polarizing film 10 can be made excellent even under high temperature and high humidity, and an image display device including the polarizing film 10 can be used for a long period of time. In addition, the method of measuring the dimensional shrinkage rate X1 of the polarizing film including the non-polarizing portion 1A will be described later.

In order to make the optical performance of the polarizing film 10 more excellent under high temperature and high humidity, the dimensional shrinkage rate X1 of the polarizing film including the non-polarizing portion 1A is preferably 0.8% or less, more preferably 0.5% or less, especially preferably 0.3% or less .

In the polarizing film 10 shown in FIG. 1 , when the hardness of the non-polarizing portion 1A is H1 (GPa), and the thickness of the non-polarizing portion 1A is d1, if H1×d1≧0.8, even under high temperature and high humidity The polarizing portion 1A swells due to the intrusion of moisture into the non-polarizing portion 1A, and even if the non-polarizing portion 1A elongates (shape changes) due to the shrinkage of the polarizing portion under high temperature and high humidity, the hardness and/or or thickness, so the shape change of the non-polarizing portion 1A can be further suppressed. As a result, the optical performance of the polarizing film can be improved even under high temperature and high humidity. The methods for measuring the hardness H1 of the non-polarizing portion 1A and the thickness d1 of the non-polarizing portion 1A will be described later.

In order to make the optical performance of the polarizing film 10 more excellent under high temperature and high humidity, H1×d1≧1.0 is preferable, and H1×d1≧1.2 is more preferable.

In the polarizing film 10 shown in FIG. 1, when the hardness of the transparent protective film 3 is H3 (GPa), and the moisture permeability of the transparent protective film 3 is T3 (g/m ² ), if H3×T3<50, then Even under high temperature and high humidity, the optical performance of the polarizing film 10 can be made more excellent, so it is preferable. For example, when the hardness H3 of the transparent protective film 3 is low, by suppressing the amount of moisture (moisture permeability) from the outside, that is, by designing the moisture permeability T3 of the transparent protective film 3 to be low, the non-polarizing portion 1A can be suppressed. Swelling, thereby further suppressing the shape change of the non-polarizing portion 1A. Also, when the moisture permeability T3 of the transparent protective film 3 is high, the amount of moisture (moisture permeability) from the outside will increase. The shape of the polarizer 1A changes.

In order to make the optical performance of the polarizing film 10 better under high temperature and high humidity, H3×T3<40 is preferable, and H3×T3<30 is especially preferable.

In the polarizing film 10 shown in FIG. 1, when the hardness of the portion of the adhesive layer 2 in contact with the non-polarizing portion 1A is H2 (GPa) and the thickness is d2 (µm), when H2×d2≧0.20, Then the thickness d2 and hardness H2 of the adhesive layer 2 in contact with the non-polarizing portion 1A will be above a certain level, so even if the non-polarizing portion 1A is invaded by moisture under high temperature and high humidity, the swelling of the non-polarizing portion 1A can still be suppressed. resulting shape change. As a result, the optical performance of the polarizing film can be improved even under high temperature and high humidity. "Among the adhesive layer 2 where the polarizer 1 and the transparent protective film 3 have been bonded, the portion in contact with the non-polarizing portion 1A of the polarizing element 1" means the portion of the adhesive layer 2 that overlaps the non-polarizing portion 1A in plan view overall.

In order to make the optical performance of the polarizing film 10 better under high temperature and high humidity, H2×d2≧0.30 is preferable, and H2×d2≧0.35 is especially preferable.

In addition, the greater the thickness of the adhesive layer that connects the polarizer and the transparent protective film, the more it can suppress the expansion of air bubbles under high temperature and high humidity, so it is ideal. However, if the thickness of the adhesive layer is large, the humidity and heat durability of the polarizing film will deteriorate. tendency. In the polarizing film 10 shown in FIG. 1 , when the thickness of the adhesive layer between the polarizer 1 other than the non-polarizing portion 1A (hereinafter also referred to as “polarizing portion”) and the transparent protective film 3 is 2 µm or less, polarization can be maintained. It is ideal for the humidity and heat durability of the film, and it can inhibit the expansion of air bubbles under high temperature and high humidity.

Hereinafter, each member constituting the polarizing film of the present invention will be described.

[Polarizer] The polarizer included in the polarizing film is composed of a resin film containing a dichroic substance. A non-polarizing portion is formed in the polarizer. The non-polarizing portion represents a portion (low-concentration portion) where the content of the upper dichroic substance is lower than that of the portion other than the non-polarizing portion of the polarizer. However, the non-polarizing portion in the present invention may be a layer where the dichroic material is released from the polarizer, or may be another layer not containing the dichroic material, and is not limited thereto. Compared with the case where through-holes are formed mechanically (for example, by cutting with a carving knife, a plotter, a water jet, etc.), cracks, delamination ( Delamination between layers), glue bleeding and other quality problems.

The method of introducing a non-polarizing portion into a polarizer includes: a method of extracting a dichroic substance from a polarizing element by chemical treatment and decolorizing it, thereby forming a non-polarizing portion on a polarizing element (hereinafter also referred to as "chemical treatment method"); or , a method of decomposing a dichroic substance by using laser light or the like to form a non-polarizing portion (hereinafter also referred to as "laser method"), etc. Among these methods, the chemical treatment method is more suitable, because it can adjust the content of the dichroic substance itself in the non-polarizing part to a lower level, and can maintain the transparency of the non-polarizing part better than the laser method. .

In the polarizing film, the length, arrangement, shape, size, etc. of the non-polarizing portion can be appropriately designed. For example, it can be designed according to the position, shape, size, etc. of the sensor portion of the mounted image display device. Specifically, it is designed so that the non-polarized part does not correspond to parts other than the sensor of the image display device (such as the image display part).

The transmittance of the non-polarizing part (for example, the transmittance measured by light with a wavelength of 550nm at 23°C) is preferably 50% or more, more preferably 60% or more, more preferably 75% or more, and especially preferably 90% or more. If the transmittance is the above, desired transparency can be ensured. For example, when the non-polarized part is made to correspond to the sensor part of the image display device, it is possible to prevent adverse effects on the imaging performance of the sensor.

The polarizer should exhibit absorption dichroism within the wavelength range of 380nm~780nm. The single transmittance (Ts) of the polarizing part of the polarizer (other than the non-polarizing part of the polarizer) is preferably 39% or more, more preferably 39.5% or more, more preferably 40% or more, especially 40.5% or more . In addition, the theoretical upper limit of the monomer transmittance is 50%, while the practical upper limit is 46%. In addition, the single transmittance (Ts) is measured with the 2-degree field of view (C light source) of JIS Z8701 and the Y value after the sensitivity correction is performed. For example, an ultraviolet-visible spectrophotometer (manufactured by JASCO Corporation, product name: V7100 ) to measure. The degree of polarization of the polarizing part of the polarizer is preferably 99.8% or more, more preferably 99.9% or more, more preferably 99.95% or more.

The thickness of the polarizer (resin film) can be set to any appropriate value. The thickness of the polarizer is typically 0.5µm~80µm. The thickness is preferably less than 30 µm, more preferably less than 25 µm, more preferably less than 18 µm, particularly preferably less than 12 µm, more preferably less than 8 µm. The thickness is preferably 1 µm or more. The thinner the thickness of the resin film used as a polarizer, the less time it takes to reduce the content of dichroic substances in the step of contacting with an alkaline solution described later.

Examples of the dichroic substance include iodine and organic dyes. These can be used individually or in combination of 2 or more types. Preferably iodine can be used. This is because the non-polarizing part can be favorably formed by contacting with the alkaline solution mentioned later.

The content of the dichroic substance in the non-polarizing portion is preferably 1.0% by weight or less, more preferably 0.5% by weight or less, and more preferably 0.2% by weight or less. If the content of the dichroic substance in the non-polarizing portion is within the above range, desired transparency can be sufficiently provided to the non-polarizing portion. Therefore, for example, when the non-polarization part is made to correspond to the sensor part of the image display device, it is possible to realize very excellent imaging performance from both the viewpoints of brightness and color tone. On the other hand, the lower limit of the content of the dichroic substance in the non-polarizing portion is generally not more than the detection limit. In addition, when iodine is used as the dichroic substance, the iodine content can be obtained, for example, from the X-ray intensity measured by X-ray fluorescence analysis, using a calibration curve prepared in advance using a standard sample.

The difference between the content of the dichroic substance in other parts and the content of the dichroic substance in the non-polarizing part is preferably 0.5% by weight or more, more preferably 1% by weight or more.

Any appropriate resin can be used for the resin forming the above-mentioned resin film. Preferably, polyvinyl alcohol-based resin (hereinafter referred to as "PVA-based resin") can be used. Examples of PVA-based resins include polyvinyl alcohol and ethylene-vinyl alcohol copolymers. Polyvinyl alcohol can be obtained by saponifying polyvinyl acetate. Ethylene-vinyl alcohol copolymer can be obtained by saponifying ethylene-vinyl acetate copolymer. The degree of saponification of the PVA-based resin is usually more than 85 mol % and less than 100 mol %, preferably 95.0 mol % to 99.95 mol %, more preferably 99.0 mol % to 99.93 mol %. The degree of saponification can be obtained in accordance with JIS K 6726-1994. By using a PVA-based resin having such a degree of saponification, a polarizer excellent in durability can be obtained. When the saponification is too high, gelation may occur.

The average degree of polymerization of the PVA-based resin can be appropriately selected according to the purpose. The average degree of polymerization is usually 1000-10000, preferably 1200-4500, more preferably 1500-4300. In addition, the average degree of polymerization can be obtained in accordance with JIS K 6726-1994.

A polarizer having a non-polarizing portion can be produced by a chemical treatment method in which a treatment liquid, such as an alkaline solution, is brought into contact with a resin film containing a dichroic substance. When iodine is used as a dichroic substance, the iodine content in the contact portion can be easily reduced (decolorization) by bringing an alkaline solution into contact with a desired portion of the resin film. Specifically, the alkaline solution can penetrate into the interior of the resin film by contact. The iodine complex contained in the resin film will be reduced to iodide ion by the alkali contained in the alkaline solution. The transmittance of the contact portion can be improved by reducing the iodine complex to iodide ions. And, the iodine turned into iodide ions moves from the resin film to the solvent of the alkaline solution. The non-polarizing portion obtained in this way can maintain its transparency well. Specifically, when the iodine complex is destroyed to increase the transmittance, the iodine remaining in the resin film will form an iodine complex again with the use of the polarizer, which will reduce the transmittance. However, if the iodine content is reduced, the prevent said problem.

Any appropriate method can be used for the contact method of the alkaline solution. Examples thereof include a method of dripping, coating, or spraying an alkaline solution on a resin film, and a method of immersing a resin film in an alkaline solution.

When in contact with alkaline solution, any suitable protective material can be used to protect the resin film so that the parts other than the desired ones do not come into contact with the alkaline solution (so as not to reduce the content of the dichroic substance). Specifically, the protective material of the resin film may, for example, be a protective film or a surface protection film. The protective film can be used directly as a protective film for polarizers. The surface protection film can be temporarily used in the manufacture of polarizers. The surface protection film can be removed from the resin film at any appropriate time, so the upper part is bonded to the resin film through the adhesive layer. Another specific example of the protective material may include a photoresist or the like.

Any appropriate basic compound can be used as the above-mentioned basic compound. Examples of basic compounds include hydroxides of alkali metals such as sodium hydroxide, potassium hydroxide, and lithium hydroxide, hydroxides of alkaline earth metals such as calcium hydroxide, inorganic alkali metal salts such as sodium carbonate, and organic compounds such as sodium acetate. Alkali metal salts, ammonia water, etc. Among them, hydroxides of alkali metals and/or alkaline earth metals are preferably used, and sodium hydroxide, potassium hydroxide, and lithium hydroxide are more preferably used. The dichroic substance can be efficiently ionized, and the non-polarizing portion can be formed more simply. These basic compounds can be used individually or in combination of 2 or more types.

As a solvent for the alkaline solution, any appropriate solvent can be used. Specifically, alcohols such as water, ethanol, and methanol, ether, benzene, chloroform, and mixed solvents thereof may be mentioned. Among them, water and alcohol are preferably used because the ionized dichroic substance can move well to the solvent.

The concentration of the alkaline solution is, for example, 0.01N~5N, preferably 0.05N~3N, more preferably 0.1N~2.5N. If the concentration is within the above-mentioned range, a desired non-polarizing portion can be formed favorably.

The liquid temperature of the alkaline solution is, for example, 20°C to 50°C. The contact time of the alkaline solution is set according to the thickness of the resin film, and the type or concentration of the alkaline compound contained in the alkaline solution, for example. The contact time is, for example, 5 seconds to 30 minutes, preferably 5 seconds to 5 minutes.

In one embodiment, the surface of the resin film is covered with a surface protection film so that at least a part thereof is exposed when it comes into contact with an alkaline solution. For example, it can be produced by attaching a surface protection film formed with small circular through-holes to a polarizer (resin film), and bringing an alkaline solution into contact with it. At this time, the other side of the resin film (the side on which the surface protection film is not disposed) is preferably also protected.

In addition, the above-mentioned resin film may also be elongated. When the resin film is long, the lamination of the resin film and the protective material should be carried out by roll-to-roll. Here, "roll-to-roll" refers to laminating while aligning the longitudinal direction of each other while feeding the roll-shaped film. In the elongated surface protection film, for example, through-holes are formed at predetermined intervals in the longitudinal direction and/or the width direction. The manufacturing method of the polarizer using the above-mentioned elongated resin film and the surface protection film used for manufacturing the elongated resin film are described in Japanese Patent Laid-Open No. 2016-027135, Japanese Patent Laid-Open No. 2016-027136, In Japanese Patent Laid-Open No. 2016-027137, Japanese Patent Laid-Open No. 2016-027138, and Japanese Patent Laid-Open No. 2016-027139, the description is incorporated herein by reference.

When exposed to an alkaline solution, the resin film is preferably made into a state that can be used as a polarizer. Specifically, various treatments such as swelling treatment, stretching treatment, dyeing treatment using the above-mentioned dichroic substance, crosslinking treatment, washing treatment, and drying treatment are preferably performed. In addition, the resin film may be a resin layer formed on a base material when various treatments are performed. The laminate of the base material and the resin layer can be obtained by, for example, a method of applying a coating liquid containing the above-mentioned resin film-forming material to the base material, or a method of laminating the resin film on the base material.

The above-mentioned dyeing treatment is typically carried out by adsorbing a dichroic substance. The adsorption method includes, for example, a method of immersing the resin film in a dye solution containing a dichroic substance, a method of applying the dye solution to the resin film, and a method of spraying the dye solution onto the resin film. A method of immersing a resin film in a dyeing solution is preferable. Because it can adsorb dichroic substances well.

When using iodine as the dichroic substance, an iodine aqueous solution can be suitably used as the above-mentioned dyeing solution. The blending amount of iodine is preferably 0.04 to 5.0 parts by weight relative to 100 parts by weight of water. In order to increase the solubility of iodine in water, it is advisable to mix iodide in the iodine aqueous solution. Potassium iodide is preferably used as the iodide. The blending amount of iodide is preferably 0.3 to 15 parts by weight relative to 100 parts by weight of water.

In the above-mentioned stretching process, the resin film representing the top line is uniaxially stretched to 3 to 7 times. In addition, the extending direction may correspond to the absorption axis direction of the obtained polarizer.

When the non-polarizing part of the polarizer is formed by decolorization by chemical treatment, the contact surface (non-polarizing part) of the alkaline solution will be more concave than the other polarizing part, and a concave part will be formed in the non-polarizing part. The maximum depth of the concave part will vary depending on the thickness of the polarizer or the contact conditions (temperature, time, etc.) It is ideal for visibility under high temperature and high humidity.

When the non-polarizing part of the polarizer is formed by decolorization by chemical treatment, the thickness and hardness of the non-polarizing part can be changed by properly adjusting the following items: the production conditions of the non-polarizing part (for example, "immerse the polarizing film in 1mol /L (1N) sodium hydroxide aqueous solution (seconds)", "time for immersing polarizing film in 1mol/L (1N) hydrochloric acid (seconds)", "drying temperature after NaOH treatment and HCl treatment (℃)".

When manufacturing the polarizer used in the present invention, any appropriate steps may be further included as needed. Examples include a step of reducing alkali metals and/or alkaline earth metals, removing the above-mentioned alkaline solution, and the like. These steps can be carried out at any suitable stage of the above-mentioned manufacturing method.

When the resin film is brought into contact with an alkaline solution, hydroxides of alkali metals and/or alkaline earth metals remain in the contact parts. And, by bringing the alkaline solution into contact with the resin film, a metal salt of an alkali metal and/or an alkaline earth metal is generated at the contact portion. These will generate hydroxide ions, and the generated hydroxide ions will act (decompose, reduce) the dichroic substances (such as iodine complexes) existing around the contact portion, and can expand the non-polarized area ( low concentration areas). Therefore, by reducing the alkali metal and/or the alkaline earth metal, it is possible to suppress the expansion of the non-polarizing region over time, and maintain the desired shape of the non-polarizing portion. The details of the step of reducing alkali metals and/or alkaline earth metals are, for example, described in Japanese Patent Laid-Open No. 2015-215609, Japanese Patent Laid-Open No. 2015-215610, and Japanese Patent Laid-Open No. 2015-215611. This description is incorporated herein by reference.

Specific examples of the removal method of the above-mentioned alkaline solution and/or post-crosslinking solution include washing, wiping removal with a waste cloth, suction removal, natural drying, heating drying, air drying, and reduced pressure drying. The cleaning solution used for cleaning may, for example, be water (pure water), alcohols such as methanol or ethanol, or a mixture thereof. Preferably water can be used. The number of times of washing is not particularly limited, and may be performed multiple times. When removing by drying, the drying temperature is, for example, 20°C to 100°C.

[Transparent protective film] The polarizing film of the present invention is that a transparent protective film is laminated on at least one side of the polarizing element through an adhesive layer. In addition, in the polarizing film of the present invention, for example, the same or different transparent protective films may be further provided on the surface of the polarizer opposite to the surface on which the transparent protective film is laminated via an adhesive layer.

As a material constituting the transparent protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, heat stability, moisture barrier property, isotropy, etc. can be used. Specific examples of the thermoplastic resin include cellulose resins such as cellulose triacetate, polyester resins, polyether resins, polyresins, polycarbonate resins, polyamide resins, polyimide resins, polyester resins, Olefin resins, (meth)acrylic resins, cyclic polyolefin resins (northylene-based resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. The transparent protective film may contain one or more kinds of any appropriate additives. Examples of additives include ultraviolet absorbers, antioxidants, slip agents, plasticizers, release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and colorants. The content of the thermoplastic resin in the transparent protective film is preferably 50-100% by weight, more preferably 50-99% by weight, more preferably 60-98% by weight, especially 70-97% by weight. When content of the said thermoplastic resin in a transparent protective film is 50 weight% or less, there exists a possibility that the high transparency etc. which a thermoplastic resin originally has can not fully be exhibited.

In addition, the material forming the transparent protective film should be excellent in transparency, mechanical strength, thermal stability, moisture barrier and isotropy, especially the moisture permeability below 150g/m ² /24h is better, 140g/m ² /24h or less is preferred, and 120g/m ² /24h or less is even better.

Functional layers such as hard coating, anti-reflection layer, anti-adhesion layer, diffusion layer and even anti-glare layer can be provided on the surface of the transparent protective film that is not attached to the polarizer. In addition, the above-mentioned functional layers such as hard coat layer, anti-reflection layer, anti-sticking layer, diffusion layer or anti-glare layer can be provided not only on the transparent protective film itself, but also separately from the transparent protective film.

The thickness of the transparent protective film can be appropriately determined. Generally speaking, it is about 1~500µm, preferably 1~300µm, and more preferably 5~200µm in terms of strength, handling, and other aspects of workability and thin layer. More preferably, it is 10 to 200 µm, and more preferably, it is 20 to 80 µm.

As the transparent protective film, a retardation film having a front retardation of 40 nm or more and/or a thickness direction retardation of 80 nm or more can be used. The front phase difference is usually controlled in the range of 40~200nm, and the thickness direction phase difference is usually controlled in the range of 80~300nm. When using a retardation film as a transparent protective film, since this retardation film can also function as a transparent protective film, thickness reduction can be aimed at. In the polarizing film of the present invention, for example, a retardation film may be further provided via an adhesive layer on the surface of the polarizer opposite to the surface on which the transparent protective film is laminated.

Examples of retardation films include birefringent films obtained by uniaxially or biaxially stretching polymer materials, alignment films of liquid crystal polymers, and alignment layers of liquid crystal polymers supported by films. The thickness of the retardation film is not particularly limited, and is generally about 20-150 μm.

As the retardation film, a reverse wavelength dispersion retardation film satisfying the following formulas (1) and (3) can also be used: 0.70<Re[450]/Re[550]<0.97...(1) 1.5×10 ^-3 ＜Δn＜6×10 ^-3 ...(2) 1.13＜NZ＜1.50...(3) (In the formula, Re[450] and Re[550] are the phases measured with light of wavelength 450nm and 550nm at 23°C respectively The in-plane retardation value of the retardation film; Δn is the in-plane birefringence of nx-ny when the refractive index of the slow axis direction and the fast axis direction of the retardation film are respectively set to nx and ny; NZ is the retardation film with nz For the refractive index in the thickness direction, the ratio of the birefringence nx-nz in the thickness direction to the in-plane birefringence nx-ny).

A retardation layer may also be provided in the polarizing film of the present invention. The retardation layer can be a single layer or multiple layers, and the retardation layer can also be used as a protective layer of the polarizer. In the polarizing film of the present invention, for example, a retardation layer may be provided via an adhesive layer on the surface of the polarizer opposite to the surface on which the transparent protective film is laminated. The type, quantity, combination, arrangement position, and characteristics of the retardation layer can be appropriately set according to the purpose.

When forming the retardation layer, a liquid crystal compound can be suitably used. For example, a wire bar, a gap coater, a cut-beam coater, a gravure coater, a slot die, or the like can be used to coat the liquid crystal compound containing the liquid crystal compound. solvent. At this time, the coated liquid crystalline solution can be dried naturally or heated. In addition, the liquid crystalline solution is preferably applied at a concentration lower than the homogeneous phase-liquid crystal phase transition concentration, that is, in a homogeneous phase state. At this time, it can be stably oriented by methods such as rubbing treatment or photo-orientation.

[adhesive layer] The polarizing film of the present invention is that a transparent protective film is laminated on at least one side of the polarizing element through an adhesive layer. The adhesive layer can be formed, for example, of a cured product layer of a curable resin composition.

The present invention is characterized in that it is designed such that the dimensional shrinkage rate X1 of the non-polarizing portion formed on the polarizer becomes 1.0% or less after being left in an environment of 85° C.-85% humidity for 72 hours. The material constituting the adhesive layer so as to satisfy the dimensional shrinkage rate X1 may be only the curable resin composition described later, or an easy-adhesive composition may be used in combination with the curable resin composition.

In the polarizing film 10 of the present invention, the thickness of the adhesive layer between the polarizing portion of the polarizer 1 and the transparent protective film 3 is preferably less than 2 µm, and preferably less than 1.8 µm. In addition, in order to ensure adhesion, the lower limit of the thickness of the adhesive layer is preferably 0.5 µm.

Curable resin compositions can be classified into radical polymerizable curable resin compositions and cationic polymerizable curable resin compositions. In the present invention, the active energy rays with a wavelength range of 10 nm to less than 380 nm are marked as ultraviolet rays, and the active energy lines with a wavelength range of 380 nm to 800 nm are marked as visible rays.

Examples of the monomer components constituting the radically polymerizable curable resin composition include compounds having radically polymerizable functional groups having carbon-carbon double bonds such as (meth)acryl groups and vinyl groups. As these monomer components, either a monofunctional radically polymerizable compound or a polyfunctional radically polymerizable compound having two or more polymerizable functional groups can be used. Moreover, these radically polymerizable compounds can be used individually by 1 type or in combination of 2 or more types. Such radically polymerizable compounds are preferably compounds having (meth)acryl groups, for example. In addition, in the present invention, the so-called (meth)acryl refers to acryl and/or methacryl, and hereinafter "(meth)" is synonymous.

As a monofunctional radically polymerizable compound, the (meth)acrylamide derivative which has a (meth)acrylamide group is mentioned, for example. (Meth)acrylamide derivatives are ideal in that not only the adhesion to polarizers or various transparent protective films can be ensured, but also the polymerization speed is fast and the productivity is excellent. Specific examples of (meth)acrylamide derivatives include, for example: N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl (Meth)acrylamide, N-isopropyl (meth)acrylamide, N-butyl (meth)acrylamide, N-hexyl (meth)acrylamide, etc. containing N-alkyl (Meth)acrylamide derivatives; N-Methylol(meth)acrylamide, N-Hydroxyethyl(meth)acrylamide, N-Methylol-N-propane(meth)propylene N-hydroxyalkyl-containing (meth)acrylamide derivatives such as amide; aminomethyl (meth)acrylamide, aminoethyl (meth)acrylamide and other N-aminoalkyl-containing ( Meth)acrylamide derivatives; N-methoxymethylacrylamide, N-ethoxymethylacrylamide and other (meth)acrylamide derivatives containing N-alkoxy groups; mercaptomethyl ( N-mercaptoalkyl-containing (meth)acrylamide derivatives such as meth)acrylamide and mercaptoethyl(meth)acrylamide, etc. In addition, heterocyclic (meth)acrylamide derivatives in which the nitrogen atom of the (meth)acrylamide group forms a heterocycle include, for example, N-acrylylmorphine, N-acrylylpiperidine , N-methacrylpiperidine and N-acrylpyrrolidine, etc.

Among the above-mentioned (meth)acrylamide derivatives, the (meth)acrylamide derivatives containing N-hydroxyalkyl groups are preferred from the viewpoint of adhesion to polarizers or various transparent protective films. Examples of the monofunctional radically polymerizable compound include various (meth)acrylic acid derivatives having a (meth)acryloxy group. Specifically, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, 2-methyl-2-nitropropyl Base (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, secondary butyl (meth)acrylate, tertiary butyl (meth)acrylate, (meth) n-pentyl acrylate, tertiary pentyl (meth)acrylate, 3-pentyl (meth)acrylate, 2,2-dimethylbutyl (meth)acrylate, n-hexyl (meth)acrylate, ( Cetyl methacrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 4-methyl-2-propylpentyl (meth)acrylate, (meth) ) Alkyl (meth)acrylate (1-20 carbon atoms) such as n-octadecyl acrylate.

In addition, the aforementioned (meth)acrylic acid derivatives include, for example: cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate and cyclopentyl (meth)acrylate; benzyl (meth)acrylate, etc. Aralkyl (meth)acrylates; 2-isobornyl (meth)acrylate, 2-norbornylmethyl (meth)acrylate, 5-norbornen-2-yl-methyl (meth)acrylate ester, 3-methyl-2-norbornylmethyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, (meth)acrylic acid Polycyclic (meth)acrylates such as dicyclopentyl ester; 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 2-methyl (meth)acrylate Oxymethoxyethyl ester, 3-methoxybutyl (meth)acrylate, ethyl carbitol (meth)acrylate, phenoxyethyl (meth)acrylate, alkylphenoxy polyethylene Alkoxy- or phenoxy-containing (meth)acrylates such as diol (meth)acrylates, and the like.

Moreover, examples of the aforementioned (meth)acrylic acid derivatives include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, (meth)acrylate Base) 2-hydroxybutyl acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxyl (meth)acrylate Decyl esters, hydroxyalkyl (meth)acrylates such as 12-hydroxylauryl (meth)acrylate; or [4-(hydroxymethyl)cyclohexyl]methyl acrylate, cyclohexanedimethanol mono(methyl) Hydroxyl-containing (meth)acrylates such as acrylates and 2-hydroxy-3-phenoxypropyl (meth)acrylate; glycidyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate Epoxy-containing (meth)acrylates such as glycidyl ether; 2,2,2-trifluoroethyl (meth)acrylate, 2,2,2-trifluoroethylethyl (meth)acrylate ester, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate, octafluoropentyl (meth)acrylate, heptadecanylfluorodecyl (meth)acrylate, 3-(meth)acrylate Halogen-containing (meth)acrylates such as chloro-2-hydroxypropyl ester; alkylaminoalkyl (meth)acrylates such as dimethylaminoethyl (meth)acrylate; (meth)acrylic acid 3 - Oxetanyl methyl ester, 3-M-oxetanyl methyl (meth)acrylate, 3-Eth-oxetanyl methyl (meth)acrylate, (Methyl) (meth)acrylic acid esters containing oxetanyl groups such as 3-but-oxetanyl methyl acrylate and 3-hexa-oxetanyl methyl (meth)acrylate; ) Tetrahydrofurfuryl acrylate, butyrolactone (meth)acrylate and other heterocyclic (meth)acrylates; or hydroxytrimethylacetic acid neopentyl glycol (meth)acrylic acid adduct, (meth) p-phenylphenol acrylate, etc.

Moreover, examples of the monofunctional radically polymerizable compound include carboxyl group-containing monomers such as (meth)acrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid.

In addition, examples of the monofunctional radically polymerizable compound include lactam-based vinyl monomers such as N-vinylpyrrolidone, N-vinyl-ε-caprolactam, and methylvinylpyrrolidone; Vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperone, vinylpyrrole, vinylpyrrole, vinylimidazole, vinylpyrazole, vinylmorphine, etc. base unit etc.

In addition, as the monofunctional radical polymerizable compound, a radical polymerizable compound having an active methylene group can be used. The radically polymerizable compound having an active methylene group is a compound having an active double bond group such as a (meth)acryl group at the end or in the molecule and has an active methylene group. Examples of the active methylene group include acetylacetyl group, alkoxymalonyl group or cyanoacetyl group and the like. The aforementioned active methylene group is preferably an acetoacetyl group. Specific examples of the radically polymerizable compound having an active methylene group include, for example: 2-acetoacetyloxyethyl (meth)acrylate, 2-acetoacetyloxypropyl (meth)acrylic acid 2-Acetylacetyloxy-1-methylethyl (meth)acrylate and other acetylacetyloxyalkyl (meth)acrylates; 2-Ethoxymalonyloxyethyl Base (meth)acrylate, 2-cyanoacetyloxyethyl (meth)acrylate, N-(2-cyanoacetyloxyethyl)acrylamide, N-(2-propionyl N-(4-Acetylacetyloxybutyl)acrylamide, N-(4-Acetylacetyloxymethylbenzyl)acrylamide, N-(2-Acetylacetylaminoethyl)acrylamide wait. The radically polymerizable compound having an active methylene group is preferably acetoacetyloxyalkyl (meth)acrylate.

In addition, examples of polyfunctional radically polymerizable compounds having two or more polymerizable functional groups include tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6-hexanediol Alcohol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol diacrylate, 2-Eth-2-butylpropanediol di(meth)acrylate Ester, bisphenol A di(meth)acrylate, bisphenol A ethylene oxide adduct di(meth)acrylate, bisphenol A propylene oxide adduct di(meth)acrylate, bisphenol A bicyclo Oxypropyl ether di(meth)acrylate, neopentyl glycol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, cyclic trimethylolpropane formal (methyl) Acrylates, Dioxanediol Di(meth)acrylate, Trimethylolpropane Tri(meth)acrylate, Neopentylthritol Tri(meth)acrylate, Neopentylthritol Tetra(meth)acrylate (meth)acrylic acid and polyol Ester, 9,9-bis[4-(2-(meth)acryloyloxyethoxy)phenyl] fluorine. Specific examples include: ARONIX M-220 (manufactured by Toagosei Co., Ltd.), LIGHT-ACRYLATE 1,9ND-A (manufactured by Kyoeisha Chemical Co., Ltd.), LIGHT-ACRYLATE DGE-4A (manufactured by Kyoeisha Chemical Co., Ltd.), LIGHT- ACRYLATE DCP-A (manufactured by Kyoeisha Chemical Co., Ltd.), SR-531 (manufactured by Sartomer), CD-536 (manufactured by Sartomer), etc. In addition, if necessary, various epoxy (meth)acrylates, urethane (meth)acrylates, polyester (meth)acrylates, or various (meth)acrylate monomers, etc. .

In the present invention, the curable resin composition may contain, in addition to the radically polymerizable compound, an acrylic oligomer obtained by polymerizing a (meth)acrylic monomer. By containing an acrylic oligomer in the adhesive composition, curing shrinkage can be reduced when the composition is cured by irradiating active energy rays, thereby reducing the adhesion between the adhesive layer and adherends such as polarizers and optical films. interface stress. As a result, the decrease in the adhesiveness between the adhesive layer and the adherend can be suppressed.

In consideration of workability and uniformity during coating, the curable resin composition should have low viscosity, so the acrylic oligomer polymerized from (meth)acrylic monomer should also have low viscosity. The acrylic oligomer having a low viscosity and preventing shrinkage of the adhesive layer due to hardening preferably has a weight average molecular weight (Mw) of 15,000 or less, more preferably 10,000 or less, and particularly preferably 5,000 or less. On the other hand, in order to sufficiently suppress the curing shrinkage of the cured product layer (adhesive layer), the weight average molecular weight (Mw) of the acrylic oligomer is preferably 500 or more, more preferably 1000 or more, especially 1500 or more. The (meth)acrylic acid monomer constituting the acrylic oligomer specifically includes, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, (meth) Isopropyl acrylate, 2-methyl-2-nitropropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, S-butyl (meth)acrylate, ( Tertiary butyl methacrylate, n-pentyl (meth)acrylate, tertiary pentyl (meth)acrylate, 3-pentyl (meth)acrylate, 2,2-dimethyl (meth)acrylate Butyl, n-hexyl (meth)acrylate, cetyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 4-methyl-(meth)acrylate Alkyl (meth)acrylate (1-20 carbon atoms) such as 2-propylpentyl ester, N-octadecyl (meth)acrylate; further examples include: cycloalkyl (meth)acrylate (for example, cyclohexyl (meth)acrylate, cyclopentyl (meth)acrylate, etc.), aralkyl (meth)acrylate (for example, benzyl (meth)acrylate, etc.), polycyclic (meth)acrylate base) acrylates (e.g. 2-isobornyl (meth)acrylate, 2-norbornylmethyl (meth)acrylate, 5-norborn-2-yl-methyl (meth)acrylate, (meth)acrylate base) 3-methyl-2-norbornyl methyl acrylate, etc.), hydroxyl-containing (meth)acrylates (such as hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2 , 3-dihydroxypropylmethyl-butyl (meth)methacrylate, etc.), (meth)acrylates containing alkoxy or phenoxy groups ((meth)acrylic acid 2-methoxy Ethyl ester, 2-ethoxyethyl (meth)acrylate, 2-methoxymethoxyethyl (meth)acrylate, 3-methoxybutyl (meth)acrylate, ethyl carbitol (meth)acrylates, phenoxyethyl (meth)acrylates, etc.), (meth)acrylates containing epoxy groups (for example, glycidyl (meth)acrylates, etc.), halogen-containing ( Meth)acrylates (e.g. 2,2,2-trifluoroethyl (meth)acrylate, 2,2,2-trifluoroethylethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate ester, hexafluoropropyl (meth)acrylate, octafluoropentyl (meth)acrylate, heptadecanylfluorodecyl (meth)acrylate, etc.), alkylaminoalkyl (meth)acrylate (such as di methylaminoethyl (meth)acrylate, etc.), etc. These (meth)acrylates can be used individually or in combination of 2 or more types. Specific examples of the acrylic oligomer (E) include "ARUFON" manufactured by Toagosei Co., Ltd., "ACTFLOW" manufactured by Soken Chemical Co., Ltd., and "JONCRYL" manufactured by BASF JAPAN Corporation.

The compounding amount of the acrylic oligomer is usually preferably 15 parts by weight or less with respect to 100 parts by weight of the total amount of monomer components in the curable resin composition. If the content of the acrylic oligomer in the composition is too high, the reaction rate will drop rapidly when the composition is irradiated with active energy rays, resulting in poor curing. On the other hand, in order to sufficiently suppress curing shrinkage of the adhesive layer, the composition preferably contains 3 parts by weight or more of an acrylic oligomer.

、2-氯9-氧硫𠮿

、2-甲基9-氧硫𠮿

、2,4-二甲基9-氧硫𠮿

、異丙基-9-氧硫𠮿

、2,4-二氯9-氧硫𠮿

、2,4-二乙基9-氧硫𠮿

、2,4-二異丙基9-氧硫𠮿

、十二基9-氧硫𠮿

等的9-氧硫𠮿

系化合物；樟腦醌；鹵化酮；醯基氧化膦；醯基膦酸酯等。The curable resin composition preferably contains a photopolymerization initiator. A photopolymerization initiator can be selected suitably according to an active energy ray. When hardening by ultraviolet light or visible light, a photopolymerization initiator that cracks by ultraviolet light or visible light is used. Examples of the aforementioned photopolymerization initiator include benzil, benzophenone, benzoylbenzoic acid, and 3,3'-dimethyl-4-methoxydiphenylketone. and other diphenyl ketone compounds; 4-(2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, α-hydroxy-α, α'-dimethylacetophenone, 2- Aromatic ketone compounds such as methyl-2-hydroxypropiophenone and α-hydroxycyclohexyl phenyl ketone; methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2- Acetophenone series compounds such as diethoxyacetophenone and 2-methyl-1-[4-(methylthio)-phenyl]-2-morpholinopropan-1-one; benzoin formazan Benzoin ether compounds such as base ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, benzoin methyl ether, etc.; aromatics such as benzyl dimethyl ketal Ketal-based compounds; aromatic sulfonyl chloride-based compounds such as 2-naphthalenesulfonyl chloride; photoactive oxime-based compounds such as 1-benzophenone-1,1-propanedione-2-(o-ethoxycarbonyl)oxime ;9-oxosulfur 𠮿

, 2-Chloro9-oxosulfur 𠮿

, 2-methyl 9-oxosulfur 𠮿

, 2,4-Dimethyl 9-oxosulfur 𠮿

, Isopropyl-9-oxosulfur

, 2,4-dichloro-9-oxosulfur 𠮿

, 2,4-Diethyl 9-oxosulfur 𠮿

, 2,4-Diisopropyl 9-oxosulfur 𠮿

, Dodecyl 9-oxosulfur 𠮿

9-oxosulfur

series compounds; camphorquinone; halogenated ketones; acyl phosphine oxides; acyl phosphonates, etc.

The compounding quantity of the said photoinitiator is 20 weight part or less with respect to 100 weight part of total amounts of the polymeric compound A. The blending amount of the photopolymerization initiator is preferably 0.01-20 parts by weight, and 0.05-10 parts by weight, more preferably 0.1-5 parts by weight.

In addition, when the curable resin composition is a visible light curable type, it is preferable to use a photopolymerization initiator having a high sensitivity to light of 380 nm or more. A photopolymerization initiator having high sensitivity to light of 380 nm or more will be described later.

(式中，R ¹及R ²表示-H、-CH ₂CH ₃、-iPr或Cl，且R ¹及R ²可相同或互異)。 相較於單獨使用對380nm以上的光有高感度之光聚合引發劑的情形，使用通式(1)所示之化合物時之接著性更優異。通式(1)所示之化合物中，以R ¹及R ²為-CH ₂CH ₃之二乙基9-氧硫𠮿

尤佳。相對於硬化性樹脂組成物之總量，硬化性樹脂組成物中通式(1)所示之化合物之組成比率宜為0.1~5重量%，較宜為0.5~4重量%，更宜為0.9~3重量%。 The aforementioned photopolymerization initiator should use the compound shown in the following general formula (1) alone, or use the compound shown in the general formula (1) in combination with the photopolymerization initiator described later to have high sensitivity to light above 380nm: [chemical formula 1 ]

(In the formula, R ¹ and R ² represent -H, -CH ₂ CH ₃ , -iPr or Cl, and R ¹ and R ² may be the same or different). Compared with the case where the photoinitiator which has high sensitivity to the light of 380 nm or more is used independently, when using the compound represented by General formula (1), it is excellent in adhesiveness. Among the compounds represented by the general formula (1), the diethyl 9-oxothiophene with R ¹ and R ² as -CH ₂ CH ₃

Excellent. The composition ratio of the compound represented by the general formula (1) in the curable resin composition is preferably 0.1 to 5% by weight, more preferably 0.5 to 4% by weight, and more preferably 0.9% to the total amount of the curable resin composition. ~3% by weight.

Moreover, it is preferable to add a polymerization initiation adjuvant as needed. Examples of polymerization initiation aids include: triethylamine, diethylamine, N-methyldiethanolamine, ethanolamine, 4-dimethylaminebenzoic acid, methyl 4-dimethylaminebenzoate, ethyl 4-dimethylaminebenzoate Esters, isoamyl 4-dimethylamine benzoate, etc., especially ethyl 4-dimethylamine benzoate. When a polymerization initiation aid is used, its addition amount is generally 0 to 5% by weight, preferably 0 to 4% by weight, most preferably 0 to 3% by weight, based on the total amount of the curable resin composition.

Moreover, a well-known photoinitiator can be used together as needed. A transparent protective film with UV absorption will not transmit light below 380nm, so the photopolymerization initiator should use a photopolymerization initiator that is highly sensitive to light above 380nm. Specifically, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-methanol Forinylphenyl)-butan-1-one, 2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl) Phenyl]-1-butanone, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenyl Phine oxide, bis(η5-2,4-cyclopentadien-1-yl)-bis(2,6-difluoro-3-(1H-pyrrol-1-yl)-phenyl)titanium, etc.

The curable resin composition preferably contains a silane coupling agent. Specific examples of silane coupling agents include vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, and 2-(3,4 epoxycyclohexyl) as active energy ray-curing compounds. Ethyltrimethoxysilane, 3-Glycidoxypropyltrimethoxysilane, 3-Glycidoxypropylmethyldiethoxysilane, 3-Glycidoxypropyltriethoxy p-Styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methylpropene Acyloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, etc.

Preferably 2-(3,4 epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane , 3-glycidoxypropyltriethoxysilane.

Relative to the total amount of the adhesive composition, the blending amount of the silane coupling agent is preferably in the range of 0.01-20% by mass, preferably 0.05-15% by mass, more preferably 0.1-10% by mass. This is because when the blending amount is greater than 20% by mass, the storage stability of the adhesive composition will deteriorate, and when it is less than 0.1% by mass, the effect of adhesive water resistance cannot be fully exerted.

Specific examples of non-active energy ray hardening silane coupling agents other than the above include: 3-ureapropyltriethoxysilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropylmethyldimethylsilane Oxysilane, 3-mercaptopropyltrimethoxysilane, bis(triethoxysilylpropyl)tetrasulfide, 3-isocyanatepropyltriethoxysilane, imidazole silane, etc.

The curable resin composition may further blend the following compounds into the adhesive composition as required: Compounds represented by the following general formula (3):

(惟，X為含反應性基之官能基，R ⁶及R ⁷分別獨立表示氫原子、可具有取代基之脂肪族烴基、芳基或雜環基)； 宜為前述通式(3')記載之化合物： [chemical formula 2]

(However, X is a functional group containing a reactive group, ^R6 and ^R7 independently represent a hydrogen atom, an aliphatic hydrocarbon group that may have a substituent, an aryl group or a heterocyclic group); it is preferably the aforementioned general formula (3') Recorded compounds:

(惟，Y為有機基，X'為X所含之反應性基，R ⁶及R ⁷與前述相同)； 更宜為後述通式(3a)~(3d)記載之化合物： [chemical formula 3]

(However, Y is an organic group, X' is a reactive group contained in X, and ^R6 and ^R7 are the same as above); more preferably, it is a compound described in general formula (3a)~(3d) below:

於接著劑組成物中摻混有該等化合物時，與偏光件或透明保護薄膜之接著性會提升，故理想。由偏光件與透明保護薄膜之接著性及耐水性提升之觀點來看，硬化性水分散性組成物中，前述通式(3)記載之化合物之含量宜為0.001~50質量%，較宜為0.1~30質量%，最宜為1~10質量%。 [chemical formula 4]

When these compounds are blended in the adhesive composition, the adhesiveness with a polarizer or a transparent protective film is improved, so it is preferable. From the viewpoint of improving the adhesion between the polarizer and the transparent protective film and water resistance, in the curable water-dispersible composition, the content of the compound described in the aforementioned general formula (3) is preferably 0.001 to 50% by mass, more preferably 0.1-30% by mass, most preferably 1-10% by mass.

In the aforementioned general formula (3), the aforesaid aliphatic hydrocarbon group can be a linear or branched alkyl group with a carbon number of 1 to 20, a cyclic alkyl group with a carbon number of 3 to 20, a carbon Alkenyl with a number of 2 to 20; aryl can be phenyl with 6 to 20 carbons that may have substituents, naphthyl with 10 to 20 carbons that may have substituents, etc.; A group of a 5-membered ring or a 6-membered ring which may have a heteroatom and may have a substituent. These may be linked to each other to form a ring. In the general formula (3), R ⁶ and R ⁷ are preferably hydrogen atoms, straight-chain or branched-chain alkyl groups with 1 to 3 carbons, most preferably hydrogen atoms.

X of the compound represented by the general formula (3) is a functional group containing a reactive group and capable of reacting with the hardening component constituting the adhesive layer. The reactive group contained in X includes, for example, a hydroxyl group, an amino group, and an aldehyde group. , carboxyl, vinyl, (meth)acryl, styryl, (meth)acrylamide, vinyl ether, epoxy, oxetanyl, α,β-unsaturated carbonyl , mercapto, halo, etc. When the curable resin composition constituting the adhesive layer is active energy ray curable, the reactive group contained in X is preferably selected from the group consisting of vinyl, (meth)acryl, styrene, (methyl) At least one reactive group in the group consisting of acrylamide group, vinyl ether group, epoxy group, oxetanyl group and mercapto group; especially when the adhesive composition constituting the adhesive layer is free radical polymerization When it is active, the reactive group contained in X is preferably at least one reactive group selected from the group consisting of (meth)acrylyl, styryl and (meth)acrylamide; When the compound represented by the formula (1) has a (meth)acrylamide group, it is preferable because the reactivity is high, and the copolymerization ratio with the active energy ray-curable resin composition can be increased. Moreover, since the polarity of a (meth)acrylamide group is high and it is excellent in adhesiveness, since the effect of this invention can be acquired efficiently, it is also preferable in this point. When the curable resin composition constituting the adhesive layer is cationic polymerizable, the reactive group contained in X preferably has a group selected from hydroxyl, amine, aldehyde, carboxyl, vinyl ether, epoxy, oxetane At least one functional group among alkyl groups and mercapto groups, especially when it has an epoxy group, is ideal because the resulting curable resin layer has excellent adhesion to the adherend; The resin composition is excellent in curability, so it is ideal.

In the present invention, the compound represented by the general formula (3) can also be a reactive group directly bonded to the boron atom. Atoms bonded via an organic group are compounds represented by the general formula (3'). For example, when the compound represented by the general formula (3) is bonded to a reactive group via an oxygen atom bonded to a boron atom, the adhesive water resistance of the polarizing film tends to deteriorate. On the other hand, when the compound represented by the general formula (3) does not have a boron-oxygen bond, but has a boron-carbon bond and a reactive group through a boron atom bonded to an organic group (general formula In the case of (3'), it is ideal because it can improve the adhesive water resistance of the polarizing film. The aforementioned organic group specifically refers to an organic group with 1 to 20 carbons that may have a substituent, more specifically, a linear or branched chain alkylene group that may have a substituent with 1 to 20 carbons, an alkylene with a carbon number of 3 to 20 Cyclic alkylene groups that may have substituents, phenylene groups that may have substituents with 6 to 20 carbons, naphthylenes that may have substituents with 10 to 20 carbons, etc.

In addition to the compounds exemplified above, the compound represented by the general formula (3) can also be exemplified by esters of hydroxyethylacrylamide and boric acid, esters of hydroxymethylacrylamide and boric acid, esters of hydroxyethyl acrylate and boric acid, And esters of (meth)acrylates such as hydroxybutyl acrylate and boric acid and boric acid.

Cationic polymerizable compounds used in cationic polymerizable curable resin compositions can be classified into monofunctional cationic polymerizable compounds with one cationic polymerizable functional group in the molecule, and monofunctional cationic polymerizable compounds with two or more cationic polymerizable functional groups in the molecule. Multifunctional cationic polymerizable compound with functional groups. The liquid viscosity of the monofunctional cationic polymerizable compound is relatively low, so by including it in the cationic polymerizable curable resin composition, the liquid viscosity can be reduced. Moreover, many monofunctional cationic polymerizable compounds have functional groups capable of exhibiting various functions, and by including them in cationic polymerizable curable resin compositions, cationic polymerizable curable resin compositions and/or cationic polymerizable curable resin compositions can be made The cured product of the resin composition exhibits various functions. The polyfunctional cationic polymerizable compound is preferably contained in the cationic polymerizable curable resin composition because it can cause three-dimensional crosslinking of the cured product of the cationic polymerizable curable resin composition. Regarding the ratio of the monofunctional cation polymerizable compound to the polyfunctional cation polymerizable compound, it is preferable to mix the polyfunctional cation polymerizable compound in the range of 10 parts by weight to 1000 parts by weight with respect to 100 parts by weight of the monofunctional cation polymerizable compound. Examples of the cationic polymerizable functional group include an epoxy group, an oxetanyl group, and a vinyl ether group. Compounds having epoxy groups include aliphatic epoxy compounds, alicyclic epoxy compounds, and aromatic epoxy compounds. From the standpoint of excellent curability or adhesiveness, the cationic polymerizable adhesive composition of the present invention preferably contains Alicyclic epoxy compound. Alicyclic epoxy compounds can be 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane Caprolactone-modified products, trimethylcaprolactone-modified products, or valerolactone-modified products of hexane carboxylate, specifically, CELLOXIDE 2021, CELLOXIDE 2021A, CELLOXIDE 2021P, CELLOXIDE 2081, CELLOXIDE 2083, and CELLOXIDE 2085 ( Above, DAICEL Chemical Industry Co., Ltd., Cyracure UVR-6105, Cyracure UVR-6107, Cyracure 30, R-6110 (above, DOW CHEMICAL Japan Co., Ltd.), etc. Compounds with oxetane groups have improved Cationic polymerizable adhesive composition has the effect of hardening or lowering the liquid viscosity of the composition, so it is suitable to be included. Compounds with oxetane groups include: 3-Eth-3-hydroxymethyl oxetane Butane, 1,4-bis[(3-Eth-3-oxetanyl)methoxymethyl]benzene, 3-Eth-3-(phenoxymethyl)oxetane, Bis[(3-Eth-3-oxetanyl)methyl] ether, 3-Ethyl-3-(2-ethylhexyloxymethyl)oxetane, phenol novolac oxetane Butane, etc., and commercially available ARON OXETANE OXT-101, ARON OXETANE OXT-121, ARON OXETANE OXT-211, ARON OXETANE OXT-221, ARON OXETANE OXT-212 (manufactured by Toagosei Co., Ltd.). Ether-based compounds can improve the hardening properties of cationic polymerizable adhesive compositions, or reduce the liquid viscosity of the composition, so they should be included. Examples of compounds with vinyl ether groups include: 2-hydroxyethyl vinyl ether , Diethylene glycol monovinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, triethylene glycol divinyl ether, cyclohexanedimethanol divinyl ether, cyclohexane Dimethanol monovinyl ether, tricyclodecane vinyl ether, cyclohexyl vinyl ether, methoxyethyl vinyl ether, ethoxyethyl vinyl ether, neopentylthritol type tetravinyl ether, and the like.

The cationic polymerizable curable resin composition contains at least one compound selected from the above-described compounds having an epoxy group, compounds having an oxetanyl group, and compounds having a vinyl ether group as a curable component, Furthermore, since these are curable by cationic polymerization, a photocationic polymerization initiator can be blended. When the photocationic polymerization initiator is irradiated with active energy rays such as visible light, ultraviolet rays, X-rays, and electron beams, it will generate cationic species or Lewis acid, and initiate the polymerization reaction of epoxy group or oxetanyl group. As a photocationic polymerization initiator, the photoacid generator mentioned later is used suitably. In addition, when the cationic polymerization curable adhesive composition is used for visible light curing, it is advisable to use a photocationic polymerization initiator that is highly sensitive to light above 380nm. Generally speaking, the photocationic polymerization initiator is around 300nm Or a compound that exhibits maximum absorption in a shorter wavelength region, so it can be mixed with a photosensitizer that exhibits maximum absorption in a longer wavelength region, specifically, in a wavelength longer than 380nm. Light of a wavelength near it is sensed to promote the generation of cationic species or acid from the photocationic polymerization initiator. Photosensitizers include, for example, anthracene compounds, pyrene compounds, carbonyl compounds, organosulfur compounds, persulfides, redox compounds, azo and diazo compounds, halogen compounds, and photoreducible dyes, etc., and these can also be mixed. above to use. In particular, an anthracene compound is preferable because of its excellent photosensitizing effect, and specifically, ANTHRACURE UVS-1331 and ANTHRACURE UVS-1221 (manufactured by Kawasaki Chemical Co., Ltd.) are mentioned. The content of the photosensitizer is preferably 0.1% by weight to 5% by weight, more preferably 0.5% by weight to 3% by weight.

Polarizing film of the present invention can utilize for example following manufacturing method to manufacture, and this manufacturing method has the following steps: The polarizer manufacturing step is to manufacture a polarizer having a non-polarizing portion with a concave portion formed on one side by treating a predetermined position of one surface of the polarizer with a treatment liquid; the coating step is to manufacture the polarizer having the aforementioned concave portion The surface of the polarizer is coated with a curable resin composition; the bonding step is to paste a transparent protective film on the surface of the aforementioned polarizer coated with the aforementioned curable resin composition; The surface side is irradiated with active energy rays to harden the curable resin composition to obtain an adhesive layer, and the polarizer and the transparent protective film are bonded through the adhesive layer. The aforementioned polarizer manufacturing steps may also include the following steps: the first step is to temporarily adhere a surface protection film with through holes on one side of the aforementioned polarizer to form a polarizing film laminate; the second step is to pass through the aforementioned surface protection film. The through hole of the film is treated with a treatment liquid at a predetermined position on one side of the polarizer to form a non-polarized portion with a concave portion on one side; and the third step is to peel and remove the surface protection film from the polarizer.

The method of coating the curable resin composition on the concave surface of the polarizer can be selected according to the viscosity of the composition or the desired thickness. Metered application method. Specific examples of the post meter coating method include a gravure roll coating method, a forward roll coating method, an air knife coating method, a bar/rod coating method, and the like. Among them, the gravure roll coating method is particularly preferable from the viewpoint of removal of foreign matter on the surface of the transparent protective film and coatability.

It is also possible to apply an easy-adhesive composition on the application surface of the adhesive composition of the polarizer before the above-mentioned application step. The method of applying the easy-adhesive composition on the bonding surface of the polarizer, in view of exerting the same effect as the above-mentioned application step, is suitable to use the post-measurement application method. When the easily-adhesive composition contains the compound described in the aforementioned general formula (3), the adhesive force between the polarizer and the transparent protective film is improved, which is preferable.

In terms of gravure roll coating, various patterns can be formed on the surface of the gravure roll, for example, honeycomb grid pattern, trapezoidal pattern, grid pattern, pyramid pattern or oblique line pattern can be formed. In order to effectively prevent appearance defects of the finally obtained polarizing film, the pattern formed on the surface of the gravure roll is preferably a honeycomb grid pattern. In the case of a honeycomb grid pattern, in order to improve the surface accuracy of the coated surface after coating the easy-adhesive composition, the groove volume is preferably 1~5cm ³ /m ² , preferably 2~3cm ³ /m ² . Similarly, in order to improve the surface accuracy of the coated surface after coating the easy-adhesive composition, the number of groove lines per inch of the roller should be 200~3000 lines/inch. Also, the ratio of the rotation speed of the gravure roll to the travel speed of the polarizer is preferably 100 to 300%.

The polarizer and the transparent protective film are bonded together through the curable resin composition coated in the above-mentioned manner. The bonding of the polarizer and the transparent protective film can be performed using a roll laminator or the like.

After laminating the polarizer and the transparent protective film, active energy rays (electron beams, ultraviolet rays, visible rays, etc.) are irradiated to harden the curable resin composition to form an adhesive layer. The irradiation direction of active energy rays (electron beams, ultraviolet rays, visible rays, etc.) can be irradiated from any appropriate direction. It is preferable to irradiate from the side of the transparent protective film. When irradiated from the polarizer side, the polarizer may be degraded by active energy rays (electron beams, ultraviolet rays, visible rays, etc.).

Any appropriate conditions may be adopted for the irradiation conditions when irradiating the electron beams, as long as the above-mentioned curable resin composition can be cured. For example, when irradiating electron beams, the acceleration voltage is preferably 5 kV to 300 kV, more preferably 10 kV to 250 kV. When the accelerating voltage is lower than 5kV, the electron beam will not be able to reach the adhesive and there is a risk of insufficient hardening; when the accelerating voltage exceeds 300kV, the penetration force through the sample will be too strong, which may cause damage to the transparent protective film or polarizer. The radiation dose is 5~100kGy, preferably 10~75kGy. When the amount of radiation is less than 5kGy, the adhesive will not harden enough; when it exceeds 100kGy, it will cause damage to the transparent protective film or polarizer, reduce the mechanical strength or cause yellowing, and fail to obtain the predetermined optical properties.

Irradiation of electron beams is usually carried out in an inert gas, but if necessary, it can also be carried out in the atmosphere or under the condition of introducing a small amount of oxygen. Although it depends on the material of the transparent protective film, by properly introducing oxygen, an oxygen barrier can be deliberately produced on the surface of the transparent protective film that the electron beam first contacts to prevent damage to the transparent protective film, and can efficiently only Next, the agent is irradiated with electron beams.

In the manufacturing method of the above-mentioned polarizing film, the active energy ray preferably includes visible light in the wavelength range of 380nm~450nm, especially the active energy ray with the largest amount of visible light in the wavelength range of 380nm~450nm. When using ultraviolet rays and visible rays and using a transparent protective film endowed with ultraviolet absorbing energy (transparent protective film that does not transmit ultraviolet rays), light with a wavelength shorter than about 380nm will be absorbed, so light with a wavelength shorter than 380nm will not reach the adhesive composition without contributing to its polymerization reaction. In addition, light with a wavelength shorter than 380nm absorbed by the transparent protective film will be converted into heat, and the transparent protective film itself will generate heat, causing curling and wrinkling of the polarizing film. Therefore, when ultraviolet light and visible light are used in the present invention, the active energy ray generating device should use a device that does not emit light with a wavelength shorter than 380nm. The ratio of cumulative illuminance is preferably 100:0 to 100:50, more preferably 100:0 to 100:40. In the manufacturing method of the polarizing film of the present invention, the active energy line is preferably a gallium-filled metal halide lamp, an LED light source emitting light in a wavelength range of 380-440nm. Alternatively, low pressure mercury lamps, medium pressure mercury lamps, high pressure mercury lamps, ultrahigh pressure mercury lamps, incandescent bulbs, xenon lamps, halogen lamps, carbon arc lamps, metal halide lamps, fluorescent lamps, tungsten filament lamps, gallium lamps, excimer lasers or Sunlight and other ultraviolet and visible light sources can also be used with band-pass filters to shield ultraviolet rays with a wavelength shorter than 380nm. In order to improve the bonding performance of the adhesive layer between the polarizer and the transparent protective film, and prevent the polarizing film from curling, it is advisable to use a metal halide lamp filled with gallium, and use a band-pass filter that can shield light with a wavelength shorter than 380nm The obtained active energy rays, or the active energy rays with a wavelength of 405nm obtained by using an LED light source.

It is preferable to heat the adhesive composition before irradiating ultraviolet light or visible light (heating before irradiation). At this time, the temperature is preferably above 40°C, more preferably above 50°C. Also, it is also preferable to heat the active energy ray-curable adhesive composition after irradiation with ultraviolet rays or visible rays (heating after irradiation). In this case, it is preferably heated to 40° C. or higher, more preferably 50° C. or higher.

In actual use, the polarizing film of the present invention can be used as an optical film laminated with other optical layers. The optical layer is not particularly limited, and one or more layers such as reflective plates, semi-transmissive plates, retardation plates (including 1/2 and 1/4 wavelength plates), viewing angle compensation films, etc. can be used to form image displays. Optical layers of devices, etc. In particular, it is a reflective polarizing film or a semi-transmissive polarizing film formed by further laminating a reflective plate or a semi-transmissive reflective plate on the polarizing film of the present invention, an elliptical polarizing film or a circular polarizing film formed by further laminating a retardation plate on the polarizing film. Polarizing film, wide viewing angle polarizing film formed by further laminating a viewing angle compensation film on the polarizing film, or polarizing film formed by further laminating a brightness enhancing film on the polarizing film.

The optical film with the above-mentioned optical layer laminated on the polarizing film can also be formed by sequentially laminating layers in the manufacturing process of image display devices, etc., but the optical film laminated in advance has excellent quality stability and assembly operations. There is an advantage of improving the manufacturing steps of image display devices and the like. Appropriate bonding means such as adhesive layers can be used during lamination. When following the above-mentioned polarizing film or other optical films, the optical axis of them can be set at an appropriate arrangement angle according to the desired retardation characteristics and the like.

An adhesive layer for bonding with other components such as a liquid crystal cell may also be provided on the above-mentioned polarizing film or an optical film laminated with at least one polarizing film. The adhesive for forming the adhesive layer is not particularly limited, and can be appropriately selected, such as acrylic polymers, polysiloxane polymers, polyesters, polyurethanes, polyamides, polyethers, fluorine-based or rubber-based polymers, etc. The material is used as the base polymer. In particular, acrylic adhesives that exhibit adhesive properties such as excellent optical transparency, moderate wettability, cohesiveness, and adhesiveness, and have excellent weather resistance or heat resistance can be suitably used.

The adhesive layer can also be provided on one or both sides of a polarizing film or an optical film in the form of overlapping layers of different compositions or types. Also, when it is installed on both sides, an adhesive layer with different composition, type, or thickness can also be used on the front and back of the polarizing film or optical film. The thickness of the adhesive layer can be appropriately determined according to the purpose of use or the adhesive force, etc., generally 1~100µm, preferably 5~30µm, especially 10~20µm.

For the exposed surface of the adhesive layer, in order to prevent it from being contaminated, it is temporarily pasted and covered with a separator before actual use. This prevents contact with the adhesive layer in normal operating conditions. As the separator, in addition to the above-mentioned thickness conditions, suitable conventional materials can be used, such as layers of plastic film, rubber sheet, paper, cloth, non-woven fabric, mesh, foam sheet or metal foil, etc. Appropriate monolithic bodies such as composites are coated with polysiloxane-based or long-chain alkyl-based, fluorine-based or molybdenum sulfide and other appropriate release agents as needed.

[image display device] The polarizing film of the present invention can be suitably used in the formation of various devices such as image display devices. The formation of the image display device can be carried out according to conventional methods. That is, an image display device is generally formed by properly assembling components such as a liquid crystal unit, a polarizing film or an optical film, and an illumination system as required, and incorporating them into a driving circuit. There is no particular limitation on the thin film or the optical thin film, and conventional knowledge can be followed. As the liquid crystal cell, for example, any type such as TN type, STN type, or π type can be used.

It can form an image display device with polarizing film or optical film on one side or both sides of the liquid crystal unit, or use a suitable image display device such as a backlight or reflector in the lighting system. At this time, the polarizing film or optical film of the present invention can be arranged on one side or both sides of the liquid crystal cell. When a polarizing film or an optical film is provided on both sides, they may be the same or different. Moreover, when forming an image display device, one or more layers such as a diffusion plate, an anti-glare layer, an anti-reflection film, a protective plate, an array, a lens array sheet, a light diffusion plate, and a backlight can be arranged at an appropriate position. and other appropriate parts. In addition, the image display device of the present invention can be, for example, organic EL (electroluminescent) display device, PDP (plasma display panel), electronic paper, etc., and is especially suitable for organic EL that can use polarizers with high transmittance. In addition, the application of the image display device can be suitably applied to applications requiring durability against high humidity and heat environments, such as foldable display devices and vehicle-mounted display devices.

The polarizing film of the present invention has a non-polarizing part formed on the polarizing element, so it is especially suitable for use in an image display device with a sensor function, and at this time, the non-polarizing part of the polarizing film is arranged at a position corresponding to the camera part.

Example Examples of the present invention are described below, but the embodiments of the present invention are not limited thereto.

＜Polarizing film production＞ Example 1 The resin substrate is an amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100µm) with a water absorption rate of 0.75% and a Tg of 75°C. Apply corona treatment to one side of the substrate, and apply polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mole%) and acetoacetylene on the corona treated surface at 25°C in a ratio of 9:1 Aqueous solution of modified PVA (polymerization degree 1200, acetylene modification degree 4.6%, saponification degree 99.0 mole % or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") and dried to form a thickness of 13 μm The PVA-based resin layer is used to produce a laminate.

In an oven at 120°C, the free end uniaxially stretched to 2.4 times in the longitudinal direction (long side direction) of the obtained laminate between rollers with different peripheral speeds (assisted stretching in the air). Next, the laminated body was immersed in an insoluble bath (an aqueous solution of boric acid obtained by mixing 4 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30° C. for 30 seconds (insoluble treatment). Next, the iodine concentration and immersion time were adjusted so that the polarizing plate had a predetermined transmittance while being immersed in a dyeing bath having a liquid temperature of 30°C. In this example, it was immersed for 60 seconds in an iodine aqueous solution obtained by mixing 0.2 parts by weight of iodine and 1.5 parts by weight of potassium iodide with respect to 100 parts by weight of water (dyeing treatment). Then, it was 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 respect to 100 parts by weight of water) at a liquid temperature of 30° C. for 30 seconds (cross-linking treatment ). Thereafter, while the laminate was immersed in an aqueous solution of boric acid at a liquid temperature of 70°C (an aqueous solution obtained by mixing 3 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water), it was placed between rollers of different peripheral speeds. Uniaxial stretching was performed in the longitudinal direction (longitudinal direction) so that the total stretching ratio was 5.5 times (stretching in water). Thereafter, the laminate was immersed in a cleaning bath (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 30° C. (washing treatment).

Next, the radical polymerizable curable resin composition is applied to the second transparent protective film, and the surface of the PVA-based resin layer of the laminate obtained above is bonded to the radical polymerizable curable resin composition coating of the second transparent protective film. Then, the following ultraviolet rays are irradiated from the side of the second transparent protective film to harden the adhesive.

Then, the substrate was peeled from the PVA-based resin layer to obtain an elongated polarizing film (polarizer/second transparent protective film) with a width of about 1300 mm. In addition, the thickness of the polarizer is 5µm, and the single transmittance is 40.8%.

(Ultraviolet) The active energy line uses ultraviolet light (metal halide lamp filled with gallium, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., bulb: V bulb, peak illuminance: 1600mW/cm ² , cumulative irradiation 1000/ mJ/cm ² (wavelength 380~440nm)). In addition, the illuminance of ultraviolet rays was measured using the Sola-Check system manufactured by Solatell.

An adhesive (acrylic adhesive) was applied to one side of an ester resin film (38 µm in thickness) having a width of approximately 1300 mm so that the thickness would be 5 µm. Through-holes with a diameter of 3.0 mm were formed at intervals of 250 mm in the longitudinal direction and at intervals of 400 mm in the width direction on the ester-based resin film with the adhesive using a pointed knife.

Lay the above-mentioned ester resin film with the adhesive on the polarizer side of the above-obtained polarizing film in a roll-to-roll manner, and dip it in 1mol/L (1N) sodium hydroxide aqueous solution for 30 seconds, then dip into In 1mol/L (1N) hydrochloric acid for 10 seconds. Thereafter, it was dried at 60° C. to form a non-polarizing portion on the polarizer. The non-polarizing portion is a thin-walled portion having a concave portion with a maximum depth dh of 0.5 µm on the side of the ester resin film.

The ester-based resin film was peeled and removed from the laminate obtained above. Next, before bonding the peeled surface of the ester resin film of the laminate to the first transparent protective film, apply the easy-adhesive composition 1 (coating thickness: 1 µm) on the peeled surface using a gravure roll coating method equipped with a gravure roll. , and air-dried at 25°C for 1 minute (thickness after drying: 0.7µm). Next, apply the adhesive composition 1 on the acrylic resin film (thickness: 40 µm) as the first transparent protective film, and stick the peeling surface of the ester resin film of the laminate (the surface that is easy to adhere to the composition 1) , and irradiate the same ultraviolet rays as above from the acrylic resin film side to harden the adhesive. The composition of adhesive composition 1 and easy-adhesive composition 1 is listed in Table 1. Moreover, the thickness of the adhesive layer after hardening is described in Table 2.

表1中記載之各構成材料如下。 ACMO(丙烯醯基嗎福林)；商品名「ACMO」，KJ Chemicals Corporation製 1,9-NDA(1,9-壬二醇二丙烯酸酯)，商品名「LIGHT ACRYLATE 1,9ND-A」，共榮社化學公司製 P2H-A(苯氧基二乙二醇丙烯酸酯)；商品名「LIGHT ACRYLATE P2Ｈ-A」，共榮社化學公司製 HEAA(羥乙基丙烯醯胺)；商品名「HEAA」，興人公司製 BYK UV3505(UV硬化型表面調整劑)；商品名「BYK UV3505」，BYK-Chemie Japan公司製 Or907(2-甲-1-[4-(甲硫基)苯基]-2-嗎福林基丙-1-酮)；商品名「Omnirad 907」，IGM resins公司製 DETX(二乙基9-氧硫𠮿

)；商品名「KAYACURE DETX-S」，日本化藥公司製 UP-1190((甲基)丙烯酸單體聚合而成之丙烯酸系寡聚物)；商品名「ARUFON UP1190」，東亞合成公司製 Or819(雙(2,4,6-三甲基苯甲醯基)苯基膦氧化物)；商品名「Omnirad 819」，IGM VPBA(4-乙烯基苯基硼酸)；商品名「4-乙烯基苯基硼酸」，東京化成工業公司製 HPAA(羥基三甲基乙酸二丙烯酸酯)；商品名LIGHT ACRYLATE HPPA」，共榮社化學公司製 M5700(2-羥-3-苯氧丙基丙烯酸酯)；商品名「ARONIX M5700」，東亞合成公司製 DEAA(二乙基丙烯醯胺)；商品名「DEAA」，KJ Chemicals Corporation製 EXP4200(調平劑)；商品名「Olfine EXP.4200」，日信化學工業公司製 [Table 1]

Each constituent material described in Table 1 is as follows. ACMO (acryloylmorpholin); trade name "ACMO", 1,9-NDA (1,9-nonanediol diacrylate) manufactured by KJ Chemicals Corporation, trade name "LIGHT ACRYLATE 1,9ND-A", P2H-A (phenoxydiethylene glycol acrylate) manufactured by Kyoeisha Chemical Co., Ltd.; trade name "LIGHT ACRYLATE P2H-A", HEAA (hydroxyethyl acrylamide) manufactured by Kyoeisha Chemical Co., Ltd.; trade name "HEAA", BYK UV3505 (UV hardening surface conditioner) manufactured by Kohin Co., Ltd.; trade name "BYK UV3505", Or907 (2-methyl-1-[4-(methylthio)phenyl] manufactured by BYK-Chemie Japan Co., Ltd. -2-morpholinylpropan-1-one); trade name "Omnirad 907", DETX (diethyl 9-oxosulfur) manufactured by IGM resins

); trade name "KAYACURE DETX-S", manufactured by Nippon Kayaku Co., Ltd. UP-1190 (acrylic oligomer polymerized from (meth)acrylic acid monomer); trade name "ARUFON UP1190", manufactured by Toagosei Co., Ltd. Or819 (bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide); trade name "Omnirad 819", IGM VPBA (4-vinylphenylboronic acid); trade name "4-vinyl Phenylboronic acid, "HPAA (hydroxytrimethylacetic acid diacrylate) manufactured by Tokyo Chemical Industry Co., Ltd.; trade name LIGHT ACRYLATE HPPA", M5700 (2-hydroxy-3-phenoxypropyl acrylate), manufactured by Kyoeisha Chemical Co., Ltd. ; trade name "ARONIX M5700", DEAA (diethylacrylamide) manufactured by Toagosei Co., Ltd.; trade name "DEAA", EXP4200 (leveling agent) manufactured by KJ Chemicals Corporation; trade name "Olfine EXP.4200", Nissin chemical industry company

In the above manner, a polarizing film having a structure of a first transparent protective film/polarizer was produced. In addition, the first transparent protective film is corresponding to the transparent protective film 3 forming the polarizing film 10 shown in Figure 1, and the polarizer is corresponding to the polarizing element 1 forming the polarizing film 10 shown in Figure 1, and the first transparent protective film and The adhesive layer of the polarizer corresponds to the adhesive layer 2 constituting the polarizing film 10 shown in FIG. 1 . The thickness of the obtained polarizing film and the measurement results of various physical properties are listed in Table 2.

[Table 2]

In Table 2, regarding the thickness d1 (µm) of the non-polarizing part of the polarizer and the thickness d2 (µm) of the part of the adhesive layer in contact with the non-polarizing part, a scanning electron microscope (manufactured by ZYGO Corporation, product name "New View 7300") for measurement. In addition, the thickness d3 (µm) of the first transparent protective film was measured using a digital micrometer (manufactured by Anritsu Corporation, product name "KC-351C").

In Table 2, the hardness H1 (GPa) of the non-polarizing portion, the hardness H2 (GPa) of the portion of the adhesive layer in contact with the non-polarizing portion, and the hardness H3 (GPa) of the transparent protective film were measured by the following methods.

Using a nanoindentation tester (manufactured by Bruker Japan, Triboindenter TI-950), a Berkovich-type indenter (manufactured by Bruker Japan, an indenter for Triboindenter TI-950 (model TI-0039; Berkovich-type diamond indenter, Front aperture angle 142.3°) is pressed into the center of each part of the polarizing film to be measured (for example, when measuring the hardness H1 of the non-polarizing part, it is measured at the center of the non-polarizing part; when measuring the hardness H3 of the transparent protective film, it is measured The central part in the thickness direction of the transparent protective film) is 50nm, measure the maximum load (Pmax) at this time and the contact area (contact projected area) (A) between the indenter and the measured part, and calculate the hardness (GPa) according to the following formula. (Hardness (GPa))=(Pmax)/(A)

In Table 2, the dimensional shrinkage ratio X1 of the polarizing film including the non-polarizing portion 1A was measured by the following method. <Measurement of Dimensional Shrinkage Rate> An adhesive layer was provided on the transparent protective film side of the polarizing film in Example 1, and a polarizing film with an adhesive layer was prepared. Using a _CO2 laser (manufactured by COMNET Inc., product name: Laser Pro-SPIRIT), cut out the attachment with the non-polarized portion 1A (the non-polarized portion is a circle with a diameter of 3 mm) formed at a position 1 cm from the central end. The polarizing film of the adhesive layer (the sample size is 10cm×10cm) is attached to the alkali-free glass with a thickness of 0.5mm to make a sample. The focus distance (MD direction and TD direction) of the four corners of the sample was measured using a planar biaxial measuring device (manufactured by Mitutoyo Corporation, product name: Quick Vision Apex). Next, the laminate was placed in an environment of 85° C.-85% humidity for 72 hours, and then the focal lengths (MD direction and TD direction) of the four corners of the optical laminate were measured in the same way. The dimensional shrinkage rate X1 of the polarizing film including the non-polarizing portion 1A was calculated from the dimensions before and after being left. Table 2 shows the dimensional shrinkage in the MD direction where the dimensional shrinkage is large. The irradiation conditions of CO ₂ laser are as follows. (Irradiation conditions) Wavelength: 10.6µm Laser output: 30W Oscillation mode: Pulse oscillation Laser beam diameter: 70µm Laser irradiation surface: Protective film side

As described in Table 2, it can be seen that in Example 1, the dimensional shrinkage rate X1 of the polarizing film including the non-polarizing portion 1A is low, so that the dimensional stability of the non-polarizing portion 1A is high, so the optical performance can be improved even under high temperature and high humidity. Still excellent.

＜Polarizing film production＞ Example 2-6 The resin substrate is an amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100µm) with a water absorption rate of 0.75% and a Tg of 75°C. Apply corona treatment to one side of the substrate, and apply polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mole%) and acetoacetylene on the corona treated surface at 25°C in a ratio of 9:1 Aqueous solution of modified PVA (polymerization degree 1200, acetylene modification degree 4.6%, saponification degree 99.0 mole % or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") and dried to form a thickness of 13 μm The PVA-based resin layer is used to produce a laminate.

In an oven at 120°C, the free end uniaxially stretched to 2.4 times in the longitudinal direction (long side direction) of the obtained laminate between rollers with different peripheral speeds (assisted stretching in the air). Next, the laminated body was immersed in an insoluble bath (an aqueous solution of boric acid obtained by mixing 4 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30° C. for 30 seconds (insoluble treatment). Next, the iodine concentration and immersion time were adjusted so that the polarizing plate had a predetermined transmittance while being immersed in a dyeing bath having a liquid temperature of 30°C. In this example, it was immersed for 60 seconds in an iodine aqueous solution obtained by mixing 0.2 parts by weight of iodine and 1.5 parts by weight of potassium iodide with respect to 100 parts by weight of water (dyeing treatment). Then, it was 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 respect to 100 parts by weight of water) at a liquid temperature of 30° C. for 30 seconds (cross-linking treatment ). Thereafter, while the laminate was immersed in an aqueous solution of boric acid at a liquid temperature of 70°C (an aqueous solution obtained by mixing 3 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water), it was placed between rollers of different peripheral speeds. Uniaxial stretching was carried out in the longitudinal direction (longitudinal direction) so that the total stretching ratio was 5.5 times (stretching in water). Thereafter, the laminate was immersed in a cleaning bath (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 30° C. (washing treatment).

Next, the radical polymerizable curable resin composition is applied to the second transparent protective film, and the surface of the PVA-based resin layer of the laminate obtained above is bonded to the radical polymerizable curable resin composition coating of the second transparent protective film. Then, the following ultraviolet rays are irradiated from the side of the second transparent protective film to harden the adhesive.

Then, the substrate was peeled from the PVA-based resin layer to obtain an elongated polarizing film (polarizer/second transparent protective film) with a width of about 1300 mm. In addition, regarding Examples 2-6 and Comparative Example 1, the thickness of the polarizer is 5 µm, and the single transmittance is 40.8%. On the other hand, in Comparative Example 2, the thickness of the polarizer was 4 µm, and the single transmittance was 40.8%.

Among the constituent materials described in Table 3, the materials other than the constituent materials described in Table 1 are as follows. VPBA (4-vinylphenylboronic acid); trade name "4-vinylphenylboronic acid", manufactured by Tokyo Chemical Industry Co., Ltd.

In Table 3, in Comparative Example 1 and Comparative Example 2, the adhesive composition that constitutes the first adhesive layer uses a water-based adhesive (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z-200", resin concentration 5% by weight and a PVA-based resin aqueous solution with a moisture content of 95% by weight).

(Ultraviolet) The active energy line uses ultraviolet light (metal halide lamp filled with gallium, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., bulb: V bulb, peak illuminance: 1600mW/cm ² , cumulative irradiation 1000/ mJ/cm ² (wavelength 380~440nm)). In addition, the illuminance of ultraviolet rays was measured using the Sola-Check system manufactured by Solatell.

An adhesive (acrylic adhesive) was applied to one side of an ester resin film (38 µm in thickness) having a width of approximately 1300 mm so that the thickness would be 5 µm. Through-holes with a diameter of 3.0 mm were formed at intervals of 250 mm in the longitudinal direction and at intervals of 400 mm in the width direction on the ester-based resin film with the adhesive using a pointed knife.

The above-mentioned ester-based resin film with an adhesive was bonded to the polarizer side of the above-obtained polarizing film in a roll-to-roll manner. The resulting polarizing films of Examples 2-6 were processed under the processing conditions described in Table 3, thereby producing polarizing films having polarizers formed with non-polarizing portions with different thicknesses and hardnesses. In addition, regarding the treatment conditions described in Table 3, "NaOH treatment time" means the time (seconds) for immersing the polarizing film in a 1 mol/L (1N) sodium hydroxide aqueous solution, and "HCl treatment time" means immersing the polarizing film The time (seconds) in 1mol/L (1N) hydrochloric acid, "drying temperature" means the drying temperature (°C) after NaOH treatment and HCl treatment.

The ester-based resin film was peeled and removed from the laminate obtained above. Next, with regard to Example 6, before bonding the release surface of the ester resin film of the laminate to the first transparent protective film, the easy-adhesive composition 1 ( Coating thickness 1µm), and air drying at 25°C for 1 minute (0.7µm thickness after drying). Next, the first transparent protective film described in Table 3 is coated with each adhesive composition described in Table 3. Regarding Examples 2-5, it is the coated surface and laminated body of each adhesive composition of the transparent protective film. The peeling side of the ester resin film was irradiated from the side of the transparent protective film with the same ultraviolet rays as above to harden the adhesive. As for Example 6, the coated surface and the easy-to-adhesive composition of each adhesive composition of the transparent protective film were attached. 1, and irradiate the same ultraviolet rays as above from the transparent protective film side to harden the adhesive. Table 3 describes the thickness of the adhesive layer after hardening.

Films (1) to (5) constituting the first transparent protective film described in Table 3 are shown below. Film (1); Toyo Kohan Co., Ltd. acrylic resin film (thickness 20 µm) Film (2); Toyo Kohan Co., Ltd. acrylic resin film (thickness 30µm) Film (3); ZEONOR-based resin film (thickness: 17 µm) manufactured by ZEON Corporation Film (4); Acrylic resin film manufactured by Toyo Kohan Co., Ltd. (thickness: 40 µm) Film (5); Konica Minolta cellulose triacetate resin film (thickness: 40 µm)

＜Polarizing film production＞ Comparative example 1-2 A water-based adhesive (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z-200", resin Concentration of 5% by weight and water content of 95% by weight of PVA-based resin aqueous solution), and after sticking to the peeling surface of the ester-based resin film, heated in an oven maintained at 80°C for 5 minutes. In addition, the viscosity of the water-based adhesive before hardening is 10mPa·s.

In the above manner, a polarizing film having a structure of a first transparent protective film/polarizer was produced. In addition, the first transparent protective film corresponds to the transparent protective film 3 constituting the polarizing film 10 shown in FIG. The adhesive layer of the polarizer corresponds to the adhesive layer 2 constituting the polarizing film 10 shown in FIG. 1 . The thickness of the obtained polarizing film and the measurement results of various physical properties are listed in Table 3.

[table 3]

In Table 3, for the thickness d1 (µm) of the non-polarizing part of the polarizer, the thickness d2 (µm) of the part of the adhesive layer in contact with the non-polarizing part, the thickness d3 (µm) of the first transparent protective film, The hardness H1 (GPa) of the non-polarizing part, the hardness H2 (GPa) of the part of the adhesive layer in contact with the non-polarizing part, the hardness H3 (GPa) of the transparent protective film, and the polarizing film including the non-polarizing part 1A The dimensional shrinkage rate X1 is measured and evaluated by the same method as in Example 1. In Table 3, the dimensional shrinkage rate of Comparative Example 2 is negative, which means that the polarizing film swells after being placed in an environment of 85°C-85% humidity for 72 hours.

＜Deformation evaluation of captured images＞ The polarizing films of Examples 1-6 and Comparative Examples 1-2 were placed in an environment of 85°C-85% humidity for 72 hours. After placing, for the non-polarizing part of each polarizing film, project the output image transmitted when the input image has grid-like line segments, and evaluate whether the center part of the non-polarizing part of the output image is due to the increase or decrease of the grid spacing in the peripheral part resulting in deformation. The less deformation, the optical performance of the polarizing film is still excellent even under high temperature and high humidity. ◎ indicates that almost no deformation is observed, ○ indicates that the peripheral portion of the non-polarized portion of the transmitted image is slightly curved but is of a practical level, and × indicates that the peripheral portion is greatly curved.

As described in Tables 2 and 3, it can be seen that in Examples 2-6, the dimensional shrinkage rate X1 of the polarizing film including the non-polarizing portion 1A is low, so that the dimensional stability of the non-polarizing portion 1A is high, so even at high temperatures and high The optical performance is still excellent under wet conditions.

1: Polarizer 1A: Non-polarized part 1h: Concave 2: Adhesive layer 2h: part 3: Transparent protective film 10: Polarizing film d1, d2, d3: thickness dh: depth

Fig. 1 is an example of a schematic cross-sectional view of a polarizing film according to an embodiment of the present invention.

1: Polarizer

1A: Non-polarized part

1h: Concave

2: Adhesive layer

2h: part

3: Transparent protective film

10: Polarizing film

d1, d2, d3: thickness

dh: depth

Claims (6)

A polarizing film, which is laminated with a transparent protective film on at least one side of the polarizing element through an adhesive layer. The polarizing film is characterized by: The aforementioned polarizer is formed with a non-polarizing portion at least in part; After being placed in an environment of 85° C.-85% humidity for 72 hours, the dimensional shrinkage rate X1 of the polarizing film including the non-polarizing portion is 1.0% or less. As the polarizing film of claim 1, when the hardness of the aforementioned non-polarizing portion is H1 (GPa), and the thickness of the aforementioned non-polarizing portion is d1, H1×d1≧0.8. The polarizing film according to claim 1, when the hardness of the transparent protective film is H3 (GPa), and the moisture permeability of the transparent protective film is T3 (g/m ² ), H3×T3<50. For the polarizing film according to claim 1, when the hardness of the portion of the adhesive layer in contact with the non-polarizing portion is H2 (GPa) and the thickness is d2 (µm), H2×d2≧0.20. The polarizing film according to claim 1, wherein the thickness of the adhesive layer between the polarizing element other than the non-polarizing portion and the transparent protective film is 2 µm or less. An image display device, characterized by: comprising the polarizing film according to claim 1, and the non-polarizing portion of the polarizing film is arranged at a position corresponding to the sensor portion.

Images