Polarizing plates and image display devices

Abstract

To provide a polarizing plate in which the occurrence of reddening is suppressed. [Solution] A polarizing plate comprising a polarizer and an ammonia block layer, wherein the ammonia block layer contains a compound (1) having an epoxy group or a carboxyl group.

Description

[Technical Field]

[0001] This disclosure relates to polarizing plates and image display devices. [Background technology]

[0002] As described in Patent Document 1, it is known that a phenomenon called reddening occurs when a polarizing plate is exposed to a high-temperature environment. Reddening is a phenomenon in which the transmittance on the long wavelength side of approximately 700 nm increases, causing the polarizing plate to appear red when crossed nicols are used. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2019-152862 [Patent Document 2] Japanese Patent Publication No. 2014-170130 [Patent Document 3] Japanese Patent Publication No. 2009-098658 [Patent Document 4] International Publication No. 2022 / 158482 [Overview of the project] [Problems that the invention aims to solve]

[0004] One of the purposes of this disclosure is to provide a polarizing plate in which the occurrence of red distortion is suppressed, and an image display device equipped therewith. [Means for solving the problem]

[0005] This disclosure relates, for example, to the following: [1] Polarizer and, Ammonia block layer, Equipped with, A polarizing plate in which the ammonia block layer contains a compound (1) having an epoxy group or a carboxyl group. [2] The polarizing plate according to [1], further comprising a first base film laminated on one surface side of the polarizer and a second base film laminated on the other surface side of the polarizer. [3] The polarizing plate according to [2], wherein the ammonia blocking layer is laminated between the first base film and the polarizer or between the second base film and the polarizer. [4] The polarizing plate according to any one of [1] to [3], wherein the polarizer includes a polyvinyl alcohol-based resin layer in which iodine is adsorbed and oriented. [5] The polarizing plate according to any one of [1] to [4], wherein the compound (1) is a polymer having an epoxy group or a rosin compound having an acid value of 100 mgKOH / or more and 500 mgKOH / or less. [6] The ammonia blocking layer includes a first polymer having a monomer unit (A) derived from an acrylic monomer (a) having a (meth)acryloyl group. The polarizing plate according to any one of [1] to [5], wherein at least a part of the monomer unit (A) is a monomer unit (A') derived from a monomer (a') having an epoxy group. [7] The polarizing plate according to [6], wherein the ratio of the monomer unit (A') in the monomer unit (A) is 12% by mass or more and 50% by mass or less. [8] The polarizing plate according to any one of [1] to [5], wherein the ammonia blocking layer includes a first polymer having a monomer unit (A) derived from an acrylic monomer (a) having a (meth)acryloyl group and a second polymer having an epoxy group. [9] The polarizing plate according to [8], wherein the content of the second polymer is 12 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the first polymer.

[10] The polarizing plate according to [5], wherein the ammonia-blocking layer contains a first polymer having a monomer unit (A) derived from an acrylic monomer (a) having a (meth)acryloyl group, and a rosin compound having an acid value of 100 mgKOH / g or more and 500 mgKOH / g or less.

[11] The polarizing plate according to

[10] , wherein the content of the rosin compound is 12 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the first polymer.

[12] The polarizing plate according to any one of [6] to

[11] , wherein at least a part of the monomer unit (A) is a monomer unit (A-1) derived from a polyfunctional monomer (a-1) having two or more (meth)acryloyl groups.

[13] The ammonia-blocking layer is a coating film of a coating solution containing a monomer component, a radical polymerization initiator, wherein the monomer component contains an acrylic monomer (a) having a (meth)acryloyl group, The polarizing plate according to any one of [1] to [5], wherein at least a part of the acrylic monomer (a) is a monomer (a') having an epoxy group.

[14] The polarizing plate according to

[13] , wherein the proportion of the monomer (a') in the acrylic monomer (a) is 12% by mass or more and 50% by mass or less.

[15] The ammonia-blocking layer is a coating film of a coating solution containing a monomer component, a radical polymerization initiator, and a polymer having an epoxy group, wherein the monomer component contains an acrylic monomer (a) having a (meth)acryloyl group, the polarizing plate according to any one of [1] to [5].

[16] The polarizing plate according to

[15] , wherein the content of the polymer having an epoxy group is 12 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the monomer component.

[17] The ammonia blocking layer is a coating film of a coating solution containing a monomer component, a radical polymerization initiator, and a rosin compound having an acid value of 100 mg KOH / g or more and 500 mg KOH / g or less. The polarizing plate according to any one of [1] to [5], wherein the monomer component contains an acrylic monomer (a) having a (meth)acryloyl group.

[18] The polarizing plate according to

[17] , wherein the content of the rosin compound is 12 parts by mass or more and 100 parts by mass or less per 100 parts by mass of the monomer component.

[19] A polarizing plate according to any one of

[13] to

[18] , wherein at least a portion of the acrylic monomer (a) is a polyfunctional monomer (a-1) having two or more (meth)acryloyl groups.

[20] An image display device comprising a polarizing plate described in any one of [1] to

[19] and an image display panel. [Effects of the Invention]

[0006] According to this disclosure, a polarizing plate in which the occurrence of red distortion is suppressed and an image display device equipped therewith are provided. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic cross-sectional view showing an example of a polarizing plate. [Figure 2] Figure 2 is a schematic cross-sectional view showing another example of a polarizing plate. [Figure 3] Figure 3 is a schematic cross-sectional view showing another example of a polarizing plate. [Figure 4] Figure 4 is a schematic cross-sectional view showing another example of a polarizing plate. [Figure 5] Figure 5 is a schematic cross-sectional view showing another example of a polarizing plate. [Figure 6] Figure 6 is a schematic cross-sectional view showing another example of a polarizing plate. [Figure 7] Figure 7 is a schematic cross-sectional view showing an example of an image display device. [Modes for carrying out the invention]

[0008] Preferred embodiments of this disclosure are described in detail below.

[0009] <Polarizing plate> The polarizing plate of this embodiment comprises a polarizer and an ammonia block layer (hereinafter sometimes simply referred to as the "block layer"). The ammonia block layer contains a compound (1) having an epoxy group or a carboxyl group.

[0010] According to the inventors' findings, when ammonia gas that enters from the outside comes into contact with the polarizer, the polarizer plate turns red. The polarizer plate of this embodiment is equipped with an ammonia blocking layer containing a compound (1) having an epoxy group or a carboxyl group. The ammonia blocking layer traps the ammonia gas, preventing it from entering the polarizer and suppressing the reddening of the polarizer plate.

[0011] The polarizing plate of this embodiment may have one ammonia block layer, or it may have two or more ammonia block layers. When the polarizing plate of this embodiment has two or more ammonia block layers, the two or more ammonia block layers may each have the same composition, or they may have different compositions.

[0012] The polarizing plate of this embodiment may include, for example, a first base film (hereinafter sometimes referred to as the "first protective film") laminated on one side of the polarizer (for example, the viewing side of the polarizer) and a second base film (hereinafter sometimes referred to as the "second protective film") laminated on the other side of the polarizer (for example, the back side of the polarizer). When the polarizing plate has multiple base films on one side of the polarizer, the first base film may be the base film closest to the polarizer among the multiple base films. Also, when the polarizing plate has multiple base films on the other side of the polarizer, the second base film may be the base film closest to the polarizer among the multiple base films.

[0013] The polarizing plate of this embodiment may further include a first bonding layer that bonds the polarizer to a first base film. Alternatively, the polarizing plate of this embodiment may further include a second bonding layer that bonds the polarizer to a second base film.

[0014] In this embodiment, the position in which the ammonia block layer is laminated is not particularly limited. The ammonia block layer may be laminated, for example, on the surface of the first base film opposite to the polarizer, on the surface of the second base film opposite to the polarizer, between the first base film and the polarizer, or between the second base film and the polarizer.

[0015] In this embodiment, it is preferable that the ammonia blocking layer is laminated between the first base film and the polarizer, or between the second base film and the polarizer. This allows ammonia gas to be trapped near the polarizer, and the penetration of ammonia gas into the polarizer is more effectively prevented. When the ammonia blocking layer is laminated between the first base film and the polarizer, it is possible to suppress the penetration of ammonia gas present or generated on the viewing side of the polarizer into the polarizer. Furthermore, when the ammonia blocking layer is laminated between the second base film and the polarizer, it is possible to suppress the penetration of ammonia gas present or generated on the back side of the polarizer into the polarizer.

[0016] In this embodiment, the ammonia block layer may be laminated on a polarizer or directly on a substrate film (for example, a first substrate film or a second substrate film).

[0017] In this embodiment, the polarizer may include, for example, a polyvinyl alcohol-based resin layer on which iodine is adsorbed and oriented. According to the inventors' findings, when the polarizer includes a polyvinyl alcohol-based resin layer on which iodine is adsorbed and oriented, reddening due to ammonia gas is likely to occur. For this reason, the polarizing plate of this embodiment can be suitably used as a polarizing plate that includes a polarizer containing a polyvinyl alcohol-based resin layer on which iodine is adsorbed and oriented, and in which reddening is suppressed.

[0018] The polarizing plate of this embodiment may have, for example, the following layer configuration (S1) to (S11). In the following description of the layer configuration, "AB layer" refers to the ammonia block layer, "substrate 1" refers to the first substrate film, and "substrate 2" refers to the second substrate film. Furthermore, if the polarizing plate is positioned on the viewing side, the following layer configuration may have the left side as the viewing side and the right side as the back side. (S1) Base material 1 / AB layer / Lamination layer / Polarizer / Lamination layer / Base material 2 (S2) Base material 1 / Lamination layer / AB layer / Polarizer / Lamination layer / Base material 2 (S3) Base material 1 / Lamination layer / Polarizer / AB layer / Lamination layer / Base material 2 (S4) Base material 1 / Lamination layer / Polarizer / Lamination layer / AB layer / Base material 2 (S5) Base material / AB layer / Lamination layer / Base material 1 / Lamination layer / Polarizer / Lamination layer / Base material 2 (S6) Base material 1 / AB layer / Lamination layer / AB layer / Polarizer / Lamination layer / Base material 2 (S7) Base material 1 / AB layer / Lamination layer / Polarizer / AB layer / Lamination layer / Base material 2 (S8) Base material 1 / AB layer / Lamination layer / Polarizer / Lamination layer / AB layer / Base material 2 (S9) Base material 1 / Lamination layer / AB layer / Polarizer / AB layer / Lamination layer / Base material 2 (S10) Base material 1 / Lamination layer / AB layer / Polarizer / Lamination layer / AB layer / Base material 2 (S11) Base material 1 / Lamination layer / Polarizer / AB layer / Lamination layer / AB layer / Base material 2

[0019] In the polarizing plate of this embodiment, in addition to the above layer configuration, an ammonia block layer may be further laminated on the surface of the first base film opposite to the polarizer. In this case, a base film (third base film) may be further laminated on the ammonia block layer. Examples of such layer configurations include the following layer configurations (S12) to (S22). In the following description of the layer configurations, "AB layer" refers to the ammonia block layer, "base 3" refers to the third base film, and "S1," etc., refers to the above layer configuration (S1), etc.

[0020] (S12) Base material 3 / Lamination layer / AB layer / S1 (S13) Base material 3 / Lamination layer / AB layer / S2 (S14) Base material 3 / Lamination layer / AB layer / S3 (S15) Base material 3 / Lamination layer / AB layer / S4 (S16) Base material 3 / Lamination layer / AB layer / S5 (S17) Base material 3 / Lamination layer / AB layer / S6 (S18) Base material 3 / Lamination layer / AB layer / S7 (S19) Base material 3 / Lamination layer / AB layer / S8 (S20) Base material 3 / Lamination layer / AB layer / S9 (S21) Base material 3 / Lamination layer / AB layer / S10 (S22) Base material 3 / Lamination layer / AB layer / S11

[0021] In the polarizing plate of this embodiment, in addition to the above layer configurations (S1) to (S11), a base film (third base film) on which an ammonia block layer is laminated may be further laminated on the surface of the first base film opposite to the polarizer. Furthermore, in the polarizing plate of this embodiment, an ammonia block layer may be further laminated on the third base film in the above layer configurations (S12) to (S22). Examples of such layer configurations include the following layer configurations (S23) to (S44). In the following description of the layer configurations, "AB layer" refers to the ammonia block layer, "base 3" refers to the third base film, and "S1," etc., refer to the above layer configuration (S1), etc.

[0022] (S23) Base material 3 / AB layer / Lamination layer / S1 (S24) Base material 3 / AB layer / Lamination layer / S2 (S25) Base material 3 / AB layer / Lamination layer / S3 (S26) Base material 3 / AB layer / Lamination layer / S4 (S27) Base material 3 / AB layer / Lamination layer / S5 (S28) Base material 3 / AB layer / Lamination layer / S6 (S29) Base material 3 / AB layer / Lamination layer / S7 (S30) Base material 3 / AB layer / Lamination layer / S8 (S31) Base material 3 / AB layer / Lamination layer / S9 (S32) Base material 3 / AB layer / Lamination layer / S10 (S33) Base material 3 / AB layer / Lamination layer / S11 (S34) Base material 3 / AB layer / Lamination layer / AB layer / S1 (S35) Base material 3 / AB layer / Lamination layer / AB layer / S2 (S36) Base material 3 / AB layer / Lamination layer / AB layer / S3 (S37) Base material 3 / AB layer / Lamination layer / AB layer / S4 (S38) Base material 3 / AB layer / Lamination layer / AB layer / S5 (S39) Base material 3 / AB layer / Lamination layer / AB layer / S6 (S40) Base material 3 / AB layer / Lamination layer / AB layer / S7 (S41) Base material 3 / AB layer / Lamination layer / AB layer / S8 (S42) Base material 3 / AB layer / Lamination layer / AB layer / S9 (S43) Base material 3 / AB layer / Lamination layer / AB layer / S10 (S44) Base material 3 / AB layer / Lamination layer / AB layer / S11

[0023] The layer configuration of the polarizing plate in this embodiment is not limited to those described above. The polarizing plate in this embodiment may, for example, have any number of ammonia block layers laminated on a polarizer and / or on a base film, as in the layer configuration of a known polarizing plate.

[0024] The configurations of the polarizing plate in this embodiment will be described in detail below.

[0025] (Polarizer) The polarizer may be any polarizer used in known polarizers.

[0026] The polarizer may be, for example, a polyvinyl alcohol-based resin layer on which a dichroic dye is adsorbed and oriented.

[0027] The polyvinyl alcohol-based resin layer may be, for example, a uniaxially stretched film.

[0028] The polyvinyl alcohol-based resin constituting the polyvinyl alcohol-based resin layer may be, for example, a saponified polyvinyl acetate-based resin. The degree of saponification of the polyvinyl acetate-based resin may be, for example, 85 mol% or more, preferably 90 mol% or more, and more preferably 99 mol% or more.

[0029] Examples of polyvinyl acetate resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers. The other monomer can be any monomer copolymerizable with vinyl acetate, such as unsaturated carboxylic acids, olefins, vinyl ethers, and unsaturated sulfonic acids.

[0030] The degree of polymerization of the polyvinyl alcohol-based resin (or the polyvinyl acetate-based resin) may be, for example, 1000 or more, or 1500 or more. Furthermore, the degree of polymerization of the polyvinyl alcohol-based resin (or the polyvinyl acetate-based resin) may be, for example, 10000 or less, or 5000 or more.

[0031] The polyvinyl alcohol-based resin may be modified. Examples of modified polyvinyl alcohol-based resins include polyvinyl formal, polyvinyl acetal, and polyvinyl butyral modified with aldehydes.

[0032] Examples of dichroic dyes include iodine and water-soluble dichroic dyes.

[0033] The thickness of the polarizer is not particularly limited, but may be, for example, 3 μm or more, 5 μm or more, or 8 μm or more. Alternatively, the thickness of the polarizer may be, for example, 50 μm or less, 40 μm or less, or 30 μm or less.

[0034] The method for manufacturing a polarizer is not particularly limited, and known methods can be employed. For example, the method for manufacturing a polarizer may involve sequentially performing a swelling step, a dyeing step, a crosslinking step, a washing step, and a drying step.

[0035] The swelling process involves immersing the raw film in a swelling solution to cause it to swell. The raw film may be a polyvinyl alcohol-based resin film.

[0036] The dyeing process involves immersing the film, after the swelling process, in a dyeing solution containing a dichroic dye, thereby adsorbing and orienting the dichroic dye onto the film.

[0037] The crosslinking process is a process of bringing a crosslinking solution into contact with the film to perform a crosslinking treatment. The crosslinking process may be performed for purposes such as water resistance, hue adjustment (complementary color), etc. The crosslinking treatment may be performed multiple times. When the crosslinking treatment is performed multiple times, the crosslinking treatment may be performed multiple times for the purpose of water resistance, or multiple crosslinking treatments may be performed multiple times for the purpose of hue adjustment. However, it is preferable to perform the crosslinking treatment for the purpose of water resistance at least once and the crosslinking treatment for the purpose of hue adjustment at least once, and it is more preferable to perform the crosslinking treatment for the purpose of hue adjustment after the crosslinking treatment for the purpose of water resistance.

[0038] The washing process involves washing the film after the crosslinking process by immersing it in a washing solution. The washing solution may be, for example, water. The drying process involves drying the film after the washing process. The drying method is not particularly limited and may be, for example, a method of heating the film after the washing process at 30 to 100°C.

[0039] In the polarizer manufacturing method, uniaxial stretching may be performed as a stretching process between each step, that is, before, after, or during any one or more steps.

[0040] (First base film) The first base film may be a film containing a resin layer. The first base film may further include a functional layer (e.g., a hard coat layer, an anti-reflective layer, an anti-sticking layer, a diffusion layer, an anti-glare layer, etc.) laminated on the resin layer. The functional layer may be laminated on the surface of the first base film opposite to the polarizer.

[0041] The resin layer is not particularly limited and can be appropriately selected from various transparent films that can be used for polarizing plates. The material constituting the resin layer may be, for example, a thermoplastic resin that is excellent in transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, etc.

[0042] Examples of thermoplastic resins that constitute the resin layer include cellulose ester resins such as triacetylcellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; polyamide resins such as nylon and aromatic polyamides; polyimide resins; polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers; (meth)acrylic resins; cyclic polyolefin resins such as cycloolefin resins and norbornene resins; polyarylate resins; polystyrene resins; and polyvinyl alcohol resins. The materials that constitute the resin layer may also be mixtures of these.

[0043] The resin layer may also be a cured resin layer formed from a curable resin. Examples of curable resins include (meth)acrylic, urethane, acrylic urethane, epoxy, and silicone resins. The curable resin may be a thermosetting resin or an ultraviolet curable resin.

[0044] As the material constituting the resin layer, at least one thermoplastic resin selected from the group consisting of cellulose ester resins, polycarbonate resins, (meth)acrylic resins, cyclic polyolefin resins, and polyester resins is preferred.

[0045] The thickness of the first base film is not particularly limited, but from the viewpoint of handling in the manufacturing process, it may be, for example, 5 μm or more, 10 μm or more, 20 μm or more, or 30 μm or more. Also, from the viewpoint of thinning the polarizing plate, the thickness of the first base film may be, for example, 200 μm or less, 100 μm or less, 80 μm or less, or 60 μm or less.

[0046] The first base film has a moisture permeability of 350 g / m² in an environment with a temperature of 40°C and a relative humidity of 90%. 2 It may be less than or equal to 24 hours. The above moisture permeability is measured in accordance with the moisture permeability test (cup method) of JIS Z0208.

[0047] The above moisture permeability is 300g / (m 2 It may be less than 24 hours, and 200g / (m 2 It may be less than 24 hours. Also, the above moisture permeability is, for example, 50 g / (m 2 • 24 hours or more, and 80g / (m 2 • 24 hours or more, or 100g / (m 2 • 24 hours or longer is also acceptable.

[0048] The first base film may be bonded to the polarizer, for example, via a first bonding layer described later.

[0049] Either one or both of the surfaces of the first substrate film to which the polarizer is bonded, and the surfaces of the polarizer to which the first substrate film is bonded, may be surface-treated. Examples of surface treatments include corona treatment, plasma treatment, primer treatment, and saponification treatment.

[0050] (Second base film) The second base film may be a film containing a resin layer. The second base film may further include a functional layer (for example, a hard coat layer, an antireflection layer, an anti-sticking layer, a diffusion layer, an antiglare layer, etc.) laminated on the resin layer. The functional layer may be laminated on the surface of the second base film opposite to the polarizer.

[0051] Examples of the resin layer in the second base film can be the same as those in the first base film.

[0052] The thickness of the second base film is not particularly limited, but from the perspective of handling properties in the manufacturing process, it may be, for example, 5 μm or more, and may also be 10 μm or more, 20 μm or more, or 30 μm or more. Also, from the perspective of thinning the polarizing plate, the thickness of the second base film may be, for example, 200 μm or less, and may also be 100 μm or less, 80 μm or less, or 60 μm or less.

[0053] The second base film may have, for example, a moisture permeability of 350 g / (m 2 ·24 h) or less under the environment of a temperature of 40 °C and a relative humidity of 90%. The above moisture permeability is measured in accordance with the moisture permeability test (cup method) of JIS Z0208.

[0054] The above moisture permeability may also be 300 g / (m 2 ·24 h) or less, or 200 g / (m 2 ·24 h) or less. Also, the above moisture permeability may be, for example, 50 g / (m 2 ·24 h) or more, and may also be 80 g / (m 2 ·24 h) or more, or 100 g / (m 2 ·24 h) or more.

[0055] The second base film may be bonded to the polarizer, for example, through the second bonding layer described later.

[0056] Either one or both of the surfaces of the second base film to which the polarizer is bonded, and the surfaces of the polarizer to which the second base film is bonded, may be surface-treated. Examples of surface treatments include corona treatment, plasma treatment, primer treatment, and saponification treatment.

[0057] (Third base film) The third base film may be a film containing a resin layer. The third base film may further include a functional layer (e.g., a hard coat layer, an anti-reflective layer, an anti-sticking layer, a diffusion layer, an anti-glare layer, etc.) laminated on the resin layer. The functional layer may be laminated on the surface of the third base film opposite to the polarizer, or on the surface on the polarizer side. A hard coat layer is preferred as the functional layer.

[0058] An example of a resin layer in the third base film is the same as the resin layer in the first base film.

[0059] The thickness of the third base film is not particularly limited, but from the viewpoint of handling in the manufacturing process, it may be, for example, 5 μm or more, 10 μm or more, 20 μm or more, or 30 μm or more. Also, from the viewpoint of thinning the polarizing plate, the thickness of the third base film may be, for example, 200 μm or less, 100 μm or less, 80 μm or less, or 60 μm or less.

[0060] (Bonding layer) The bonding layer may be an adhesive layer or an adhesive layer (curable adhesive layer), and is preferably an adhesive layer (curable adhesive layer).

[0061] The adhesive layer may be a layer composed of an adhesive composition. The adhesive composition may be any adhesive composition that exhibits excellent optical transparency and can be appropriately selected from known adhesive compositions. Examples of adhesive compositions include those having acrylic resins, urethane resins, silicone resins, polyvinyl ether resins, etc., as base polymers. Of these, adhesive compositions using acrylic resins as the base polymer are preferred from the viewpoint of excellent transparency, adhesive strength, re-peelability, weather resistance, heat resistance, etc. The adhesive composition may further contain crosslinking agents, silane compounds, antistatic agents, etc.

[0062] The adhesive layer may be a layer composed of a cured product of the adhesive composition. The adhesive composition can be appropriately selected from known adhesive compositions used for polarizing plates. Examples of adhesive compositions include aqueous adhesive compositions obtained by dissolving or dispersing a curable adhesive component in water, and active energy ray curable adhesive compositions containing active energy ray curable compounds.

[0063] Water-based adhesive compositions are preferred as adhesive compositions. Examples of water-based adhesive compositions include isocyanate-based adhesives, polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl latex adhesives, and water-based polyester adhesives.

[0064] The thickness of the bonding layer is not particularly limited. When using a water-based adhesive composition, it may be, for example, 1 to 5000 nm or 10 to 1000 nm. When using an active energy ray-curable adhesive composition, the thickness of the bonding layer may be, for example, 0.1 to 10 μm or 0.5 to 5 μm. When using an adhesive composition, the thickness of the bonding layer may be, for example, 0.1 to 30 μm, 3 to 30 μm or 5 to 25 μm.

[0065] (Ammonia block layer) The ammonia block layer contains a compound (1) having an epoxy group or a carboxyl group.

[0066] The ammonia block layer may, for example, contain compound (1) as a matrix material constituting the layer, or it may contain both the matrix material and compound (1).

[0067] The matrix material may be a photocurable resin, a thermosetting resin, or a thermoplastic resin.

[0068] Examples of compound (1) include polymers having epoxy groups. Examples of compound (1) include rosin compounds having an acid value of 100 mg KOH / to 500 mg KOH / .

[0069] The thickness of the ammonia blocking layer may be, for example, 0.05 μm or more, and may also be 0.1 μm or more, 0.2 μm or more, or 0.3 μm or more. A thicker ammonia blocking layer allows the ammonia blocking layer to trap ammonia gas more reliably, and can more significantly suppress the reddening of the polarizing plate. The thickness of the ammonia blocking layer may be, for example, 20 μm or less, and may also be 10 μm or less, or 5 μm or less, or may be less than 3 μm, 2.5 μm or less, or 2 μm or less.

[0070] The surface of the ammonia block layer that is laminated with the bonding layer may be subjected to a surface treatment. Examples of surface treatments include corona treatment, plasma treatment, primer treatment, and saponification treatment.

[0071] The following are examples of preferred embodiments of the ammonia block layer.

[0072] (First aspect) The ammonia blocking layer of the first embodiment is a coating film of a coating solution containing a monomer component and a radical polymerization initiator. In the first embodiment, the monomer component contains an acrylic monomer (a) having a (meth)acryloyl group, and at least a portion of the acrylic monomer (a) is a monomer (a') having an epoxy group. In this specification, (meth)acryloyl group means acryloyl group or methacryloyl group.

[0073] The ammonia blocking layer of the first embodiment is a coating film of a coating liquid containing a monomer component that has an epoxy group (a'), and therefore contains a first polymer which is a polymer of the monomer component, and the first polymer has an epoxy group (or a derivative thereof). For this reason, according to the ammonia blocking layer of the first embodiment, ammonia gas is trapped by the first polymer, preventing the ammonia gas from entering the polarizer, and suppressing the reddening of the polarizer.

[0074] The first monomer formed in the first embodiment may be the same as the first monomer in the second embodiment described later.

[0075] The monomer component may be, for example, a compound having a (meth)acryloyl group or a polymerizable group (e.g., an ethylenically unsaturated double bond) that can polymerize with a (meth)acryloyl group, and is preferably a compound having a (meth)acryloyl group (i.e., acrylic monomer (a)).

[0076] In the first embodiment, at least a portion of the acrylic monomer (a) may be a polyfunctional monomer (a-1) having two or more (meth)acryloyl groups.

[0077] Monomer (a') may be a monomer having one (meth)acryloyl group, or a monomer having two or more (meth)acryloyl groups (i.e., a monomer corresponding to polyfunctional monomer (a-1)). In other words, acrylic monomer (a) may contain a monomer having an epoxy group and one (meth)acryloyl group (a monomer corresponding to monomer (a') but not monomer (a-1)), a monomer without an epoxy group and two or more (meth)acryloyl groups (a monomer not corresponding to monomer (a') but corresponding to monomer (a-1)), or a monomer having an epoxy group and two or more (meth)acryloyl groups (a monomer corresponding to both monomer (a') and monomer (a-1)).

[0078] The acrylic monomer (a) may further contain a monomer that does not have an epoxy group and has one (meth)acryloyl group (a monomer that does not fall under either monomer (a') or monomer (a-1)).

[0079] The monomer (a') may be a compound having a (meth)acryloyl group and an epoxy group.

[0080] The monomer (a') may be a compound having one (meth)acryloyl group, or a compound having two or more (meth)acryloyl groups. The number of (meth)acryloyl groups in monomer (a') may be, for example, 4 or less, 3 or less, or 2 or less.

[0081] The monomer (a') may be a compound having one epoxy group, or a compound having two or more epoxy groups. The number of epoxy groups in monomer (a') may be, for example, four or less, three or less, or two or less.

[0082] As monomer (a'), compounds having one (meth)acryloyl group and one epoxy group can be suitably used.

[0083] Examples of monomer (a') include glycidyl acrylate and glycidyl methacrylate, with glycidyl methacrylate being preferred.

[0084] The monomer (a') may be used alone, in combination of two or more types, or a commercially available product containing two or more types may be used.

[0085] The proportion of monomer (a') in acrylic monomer (a) (i.e., the amount of monomer (a') relative to the total amount of acrylic monomer (a)) may be, for example, 0.5% by mass or more, and may be 1% by mass or more, 5% by mass or more, 10% by mass or more, 12% by mass or more, 15% by mass or more, 17% by mass or more, or 20% by mass or more. A higher proportion of monomer (a') tends to more significantly suppress reddening due to ammonia gas. Furthermore, the proportion of monomer (a') in acrylic monomer (a) may be, for example, 50% by mass or less, and may be 40% by mass or less, 30% by mass or less, or 25% by mass or less. A lower proportion of monomer (a') tends to further improve the strength of the ammonia block layer.

[0086] Monomer (a-1) is a compound having two or more (meth)acryloyl groups.

[0087] Monomer (a-1) may or may not have an epoxy group. From the viewpoint of ease of obtaining the monomer, monomer (a-1) may be a compound without an epoxy group.

[0088] Monomer (a-1) may be a compound having three or more (meth)acryloyl groups (hereinafter also referred to as monomer (a-1-1)), or a compound having two (meth)acryloyl groups (hereinafter also referred to as monomer (a-1-2)). The number of (meth)acryloyl groups in monomer (a-1) and monomer (a-1-1) may be, for example, 10 or less, 8 or less, 6 or less, or 4 or less.

[0089] Monomer (a-1) may be a cyclic monomer having a cyclic structure or an acyclic monomer not having a cyclic structure, but it is preferable that it be an acyclic monomer. When monomer (a-1) is an acyclic monomer, ester bonds can be more densely present in the formed polymer, and the ammonia blocking properties of the ammonia blocking layer tend to be improved.

[0090] From the viewpoint of making it easier to obtain an ammonia block layer with high layer strength, it is preferable that monomer (a-1) has a high proportion of monomer (a-1-1). The proportion of monomer (a-1-1) in monomer (a-1) (i.e., the content of monomer (a-1-1) on a basis of the total amount of monomer (a-1)) may be, for example, 50% by mass or more, and may be 70% by mass or more, 80% by mass or more, or 85% by mass or more. Alternatively, the proportion of monomer (a-1-1) in monomer (a-1) (i.e., the content of monomer (a-1-1) on a basis of the total amount of monomer (a-1)) may be, for example, 100% by mass or less, and may be 97% by mass or less, 95% by mass or less, or 90% by mass or less.

[0091] Examples of monomers (a-1) that have three or more (meth)acryloyl groups (monomer (a-1-1)) include pentaerythritol tetra(meth)acrylate, EO-modified pentaerythritol tetra(meth)acrylate, PO-modified pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, EO-modified trimethylolpropane tri(meth)acrylate, PO-modified trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and glycerin tri(meth)acrylate.

[0092] Preferred monomers (a-1-1) include pentaerythritol tetra(meth)acrylate, EO-modified pentaerythritol tetra(meth)acrylate, PO-modified pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, EO-modified trimethylolpropane tri(meth)acrylate, PO-modified trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, and glycerin tri(meth)acrylate, with pentaerythritol tetra(meth)acrylate, trimethylolpropane tri(meth)acrylate, and glycerin tri(meth)acrylate being more preferred. These monomers (a-1-1) have relatively small acrylic equivalents, allowing for denser ester bonding in the resulting polymer, which tends to improve ammonia blocking properties. As the monomer (a-1-1), trimethylolpropane triacrylate and glycerin triacrylate are more preferred, and glycerin triacrylate is particularly preferred, because they are readily available as commercially available products with a small number of functional groups, a relatively large acrylic equivalent, and a low impurity content.

[0093] Monomer (a-1-1) may contain compounds having hydroxyl groups (e.g., monomer (b-1) described below) as impurities as by-products during synthesis. The hydroxyl value of monomer (a-1-1) may be, for example, 200 mg KOH / g or less, and may be 100 mg KOH / g or less, 70 mg KOH / g or less, or 50 mg KOH / g or less, from the viewpoint of avoiding the consumption of epoxy groups by hydroxyl groups and more significantly suppressing the reddening of polarizing plates by ammonia gas.

[0094] Examples of monomers (a-1) that have two (meth)acryloyl groups (monomers (a-1-2)) include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, and tricyclodecanedimethanol di(meth)acrylate.

[0095] As monomer (a-1-2), compounds that can be synthesized from diols with a small molecular weight, such as ethylene glycol di(meth)acrylate and 1,4-butanediol di(meth)acrylate, are preferred.

[0096] The monomer (a-1) may be used alone, in combination of two or more types, or a commercially available product containing two or more types may be used.

[0097] Examples of commercially available monomers (a-1) include "NK Ester A-DCP," "NK Ester A-TMPT," "NK Ester ATM-35E," and "NK Ester A-TMMT" from Shin Nakamura Chemical Industry Co., Ltd., "Viscote® #195," "Viscote® #300," and "Viscote® #360" from Osaka Organic Chemical Industry Co., Ltd., the acrylate monomers "IRR 214-K," "PETIA," "PETRA," "TMPTA," "TMPEOTA," "EBECRYL 135," "OTA 480," and "EBERCRY L 40" from Daicel Ornex Co., Ltd., "BS710" and "BS730" from Arakawa Chemical Industries, Ltd., and "Aronics® M-920" and "Aronics® M-930" from Toagosei Co., Ltd.

[0098] The proportion of monomer (a-1) in acrylic monomer (a) (i.e., the content of monomer (a-1) on a total basis of acrylic monomer (a)) may be, for example, 50% by mass or more, and may be 60% by mass or more, 70% by mass or more, or 75% by mass or more. Also, the proportion of monomer (a-1) in acrylic monomer (a) (i.e., the content of monomer (a-1) on a total basis of acrylic monomer (a)) may be, for example, 99.5% by mass or less, and may be 99% by mass or less, 95% by mass or less, 90% by mass or less, 88% by mass or less, 85% by mass or less, 83% by mass or less, or 80% by mass or less.

[0099] Acrylic monomer (a) may contain a monomer that does not fall under either monomer (a') or monomer (a-1), that is, a compound having one (meth)acryloyl group and no epoxy group (hereinafter also referred to as monomer (a-2)).

[0100] Examples of monomers (a-2) include alkyl (meth)acrylates (e.g., methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, etc.).

[0101] The proportion of monomer (a-2) in acrylic monomer (a) may be, for example, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass. That is, the content of monomers corresponding to at least one of monomer (a') and monomer (a-1) in acrylic monomer (a) may be, for example, 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass, based on the total amount of acrylic monomer (a).

[0102] The acrylic monomer (a) may, for example, include a compound having one (meth)acryloyl group and one epoxy group as monomer (a') (monomer (a'')), and a compound having two or more (meth)acryloyl groups and no epoxy groups as monomer (a-1) (monomer (a-1')).

[0103] The total amount of monomer (a'') and monomer (a-1') may be, for example, 60% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or 100% by mass, based on the total amount of acrylic monomer (a).

[0104] The monomer component may further contain other monomers besides the acrylic monomer (a). The other monomers are those that can be radically polymerized with the acrylic monomer (a). Examples of other monomers include styrene.

[0105] The proportion of acrylic monomer (a) in the monomer components (i.e., the content of acrylic monomer (a) on a basis of the total amount of monomer components) may be, for example, 80% by mass or more, and from the viewpoint of obtaining the above-mentioned effects more significantly, it may be 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or even 100% by mass.

[0106] The monomer component may contain monomer (b-1) having a hydroxyl group. Monomer (b-1) may further have a (meth)acryloyl group. Monomer (b-1) may exist, for example, as a byproduct during the synthesis of monomer (a-1). Note that monomer (b-1) may be the monomer corresponding to monomer (a-1) or monomer (a-2).

[0107] The content of monomer (b-1) may be, for example, 40% by mass or less, 30% by mass or less, 20% by mass or less, or 15% by mass or less, or even 0% by mass, based on the total amount of monomer components. By reducing the content of monomer (b-1), the consumption of epoxy groups due to the reaction between the hydroxyl group of monomer (b-1) and the epoxy group of monomer (a') can be avoided, and the reddening of the polarizing plate by ammonia gas can be suppressed more significantly.

[0108] When the monomer component contains monomer (b-1), the amount of monomer (b-1) may be, for example, 1% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass or more, or 10% by mass or more, based on the total amount of the monomer component.

[0109] The monomer component may further contain monomer (c-1) having a functional group (excluding hydroxyl groups) that reacts with the epoxy group and inhibits ammonia adsorption by the epoxy group, but it is desirable that the content of monomer (c-1) be low. The content of monomer (c-1) may be, for example, 30% by mass or less based on the total amount of the monomer component, and may also be 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass. By reducing the content of monomer (c-1), the consumption of epoxy groups can be avoided, and the reddening of the polarizer due to ammonia gas can be suppressed more significantly.

[0110] Examples of functional groups that monomer (c-1) may possess include amino groups and carboxyl groups.

[0111] Note that monomer (c-1) may be monomer (a-1) or monomer (a-2).

[0112] A radical polymerization initiator can be any agent that generates radicals and initiates the polymerization reaction of monomer components. Photoradical polymerization initiators are preferred as radical polymerization initiators.

[0113] As the radical polymerization initiator, known radical polymerization initiators may be used. For example, as radical polymerization initiators, those exemplified as polymerization initiators in Japanese Patent Application Publication No. 2014-170130 and those exemplified as photoradical initiators in Japanese Patent Application Publication No. 2009-098658 may be used as appropriate.

[0114] Examples of radical polymerization initiators include acetophenones, benzoins, phosphine oxides, ketals, anthraquinones, thioxanthones, azo compounds, peroxides, 2,3-dialkyldione compounds, disulfide compounds, fluoroamine compounds, aromatic sulfonium compounds, rhofin dimers, onium salts, borate salts, active esters, active halogens, inorganic complexes, and coumarins.

[0115] The radical polymerization initiator may be a commercially available product. Examples of commercially available photoradical polymerization initiators include BASF's "Irgacure® 651", "Irgacure® 184", "Irgacure® 819", "Irgacure® 907", "Irgacure® 1870" (CGI-403 / Irgacure® 184 = 7 / 3 mixed initiator), "Irgacure® 500", "Irgacure® 369", "Irgacure® 1173", "Irgacure® 2959", "Irgacure® 4265", "Irgacure® 4263", "Irgacure® 127", "OXE01", etc.; and Nippon Kayaku Co., Ltd.'s "Kayacure® Examples include "DETX-S", "KayaCure® BP-100", "KayaCure® BDMK", "KayaCure® CTX", "KayaCure® BMS", "KayaCure® 2-EAQ", "KayaCure® ABQ", "KayaCure® CPTX", "KayaCure® EPD", "KayaCure® ITX", "KayaCure® QTX", "KayaCure® BTC", "KayaCure® MCA", etc.; and "Esacure®" manufactured by Sartmar (KIP100F, KB1, EB3, BP, X33, KTO46, KT37, KIP150, TZT), etc.

[0116] Radical polymerization initiators may be used individually or in combination of two or more types.

[0117] The content of the radical polymerization initiator may be, for example, 0.1 parts by mass or more, 0.5 parts by mass or more, or 1 part by mass or more, per 100 parts by mass of the monomer component. Alternatively, the content of the radical polymerization initiator may be, for example, 15 parts by mass or less, 10 parts by mass or less, 8 parts by mass or less, 6 parts by mass or less, or 5 parts by mass or less, per 100 parts by mass of the monomer component.

[0118] From the viewpoint of avoiding a reduction in effectiveness due to the consumption of epoxy groups, it is desirable that the coating solution substantially contains no cationic polymerization initiators (especially photocatalytic cationic polymerization initiators). Substantially containing no cationic polymerization initiators means, for example, that the content of cationic polymerization initiators is 0.3 parts by mass or less per 100 parts by mass of monomer components. The content of cationic polymerization initiators may be 0.2 parts by mass or less, 0.1 parts by mass or less, 0.01 parts by mass or less, or 0 parts by mass per 100 parts by mass of monomer components.

[0119] The coating solution may further contain other components not listed above.

[0120] The coating liquid may contain, for example, a solvent. The solvent is not particularly limited and should be any solvent capable of dissolving monomer components. A solvent that dries easily is preferred.

[0121] Examples of solvents include ketone-based solvents such as methyl ethyl ketone, acetylacetone, and acetone; ester-based solvents such as dimethyl carbonate, methyl acetate, and ethyl acetate; and aromatic hydrocarbon-based solvents such as toluene.

[0122] The solvent may be appropriately selected depending on the type of monomer component, etc. Furthermore, the solvent may be appropriately selected depending on the type of layer on which the ammonia block layer is formed (e.g., polarizer, base film, etc.). For example, when a cellulose acylate film is used as the base film, using methyl ethyl ketone, methyl acetate, acetone, toluene, etc. as the solvent tends to improve the adhesion between the base film and the ammonia block layer.

[0123] The solvent may be used alone or in combination of two or more types.

[0124] The solvent content is not particularly limited, and may be adjusted as appropriate, for example, so that the solid content concentration of the coating solution falls within the preferred range described later.

[0125] The solid content concentration of the coating solution may be, for example, 10% by mass or more, and may also be 20% by mass or more, 30% by mass or more, or 40% by mass or more. Alternatively, the solid content concentration of the coating solution may be, for example, 90% by mass or less, and may also be 80% by mass or less, 75% by mass or less, or 70% by mass or less.

[0126] The coating solution may further contain additives as components other than those mentioned above. Examples of additives include silica fine particles, fluorine-containing compounds, and silicone-based compounds.

[0127] The amount of additives is not particularly limited and may be adjusted as appropriate within the range in which the above-mentioned effects can be obtained. The amount of additives may be, for example, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 1% by mass or less, or even 0% by mass, based on the total amount of solids in the coating solution. That is, the total amount of monomer components and radical polymerization initiators in the coating solution may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass, based on the total amount of solids.

[0128] The coating film formed from the coating liquid functions as an ammonia blocking layer. The coating film can be formed by applying the coating liquid onto a resin layer (e.g., a polarizer, a base film, etc.), and then drying and curing it.

[0129] The drying method is not particularly limited and should be any method that can sufficiently remove the solvent from the coating film. Examples of drying methods include heating, reduced pressure, and combinations thereof.

[0130] The curing method is not particularly limited and can be any method that generates active species from a radical polymerization initiator and polymerizes the monomer components. Curing may be carried out by, for example, light irradiation. Light irradiation may be, for example, ultraviolet irradiation.

[0131] The conditions for light irradiation are not particularly limited; any conditions that allow for the generation of active species from the radical polymerization initiator and the polymerization of monomer components are acceptable. The conditions for light irradiation may be appropriately adjusted depending on the type and amount of monomer components, the type and amount of radical polymerization initiator, the thickness of the coating film, etc.

[0132] The illuminance during light irradiation is, for example, 100-1000 mW / cm². 2 The irradiation dose in light irradiation may be, for example, 50 to 1000 mJ / cm². 2 That's fine.

[0133] (Second aspect) The ammonia block layer of the second embodiment comprises a first polymer having monomer units (A) derived from an acrylic monomer (a) having a (meth)acryloyl group. In the second embodiment, at least a portion of monomer units (A) is monomer units (A') derived from a monomer (a') having an epoxy group.

[0134] In the second embodiment of the ammonia blocking layer, the first polymer has monomer units (A'), and the epoxy groups (or derivatives thereof) of the monomer units (A') trap the ammonia gas. Therefore, according to the ammonia blocking layer of the second embodiment, the penetration of ammonia gas into the polarizer is prevented, and the reddening of the polarizer is suppressed.

[0135] The ammonia block layer in the second embodiment may be a layer formed from the coating liquid in the first embodiment described above.

[0136] In a second embodiment, at least a portion of the monomer unit (A) may be a monomer unit (A-1) derived from a monomer (a-1) having two or more (meth)acryloyl groups.

[0137] The first polymer may have monomer units derived from a monomer having an epoxy group and one (meth)acryloyl group (a monomer that corresponds to monomer (a') but not monomer (a-1)) (monomer units that correspond to monomer (A') but not monomer (A-1)), or it may have monomer units derived from a monomer that does not have an epoxy group and has two or more (meth)acryloyl groups (a monomer that does not correspond to monomer (a') but corresponds to monomer (a-1)) (monomer units that do not correspond to monomer (A') but correspond to monomer (A-1)), or it may have monomer units derived from a monomer having an epoxy group and two or more (meth)acryloyl groups (a monomer that corresponds to both monomer (a') and monomer (a-1)) (monomer units that correspond to both monomer (A') and monomer (A-1)).

[0138] The first polymer may further have monomer units derived from a monomer that does not have an epoxy group and has one (meth)acryloyl group (a monomer that does not fall under either monomer (a') or monomer (a-1)).

[0139] In this specification, "monomer-derived monomer units" refers to constituent units that can be formed by the polymerization reaction of monomers.

[0140] A monomer unit (A') is a monomer unit derived from a monomer (a'). Examples of monomers (a') include the same monomer (a') as in the first embodiment described above.

[0141] The ratio of monomer units (A') to monomer units (A) (i.e., the content of monomer units (A') relative to the total amount of monomer units (A)) may be, for example, 0.5% by mass or more, and may also be 1% by mass or more, 5% by mass or more, 10% by mass or more, 12% by mass or more, 15% by mass or more, 17% by mass or more, or 20% by mass or more. A higher ratio of monomer units (A') tends to more significantly suppress reddening due to ammonia gas. Furthermore, the ratio of monomer units (A') to monomer units (A) may be, for example, 50% by mass or less, and may also be 40% by mass or less, 30% by mass or less, or 25% by mass or less. A lower ratio of monomer units (A') tends to further improve the strength of the ammonia block layer.

[0142] A monomer unit (A-1) is a monomer unit derived from monomer (a-1). Examples of monomer (a-1) include the same monomer (a-1) as in the first embodiment described above.

[0143] The monomer unit (A-1) may be a monomer unit (A-1-1) derived from a compound having three or more (meth)acryloyl groups (monomer (a-1-1)), or a monomer unit (A-1-2) derived from a compound having two (meth)acryloyl groups (monomer (a-1-2)). Examples of monomer (a-1-1) and monomer (a-1-2) are the same as those in the first embodiment described above.

[0144] From the viewpoint of making it easier to obtain an ammonia block layer with high layer strength, it is preferable that the proportion of monomer units (A-1-1) is high. The proportion of monomer units (A-1-1) in monomer units (A-1) (i.e., the content of monomer units (A-1-1) based on the total amount of monomer units (A-1)) may be, for example, 50% by mass or more, and may be 70% by mass or more, 80% by mass or more, or 85% by mass or more. Also, the proportion of monomer units (A-1-1) in monomer units (A-1) (i.e., the content of monomer units (A-1-1) based on the total amount of monomer units (A-1)) may be, for example, 100% by mass or less, and may be 97% by mass or less, 95% by mass or less, or 90% by mass or less.

[0145] The ratio of monomer units (A-1) to monomer units (A) (i.e., the content of monomer units (A-1) based on the total amount of monomer units (A)) may be, for example, 50% by mass or more, and may be 60% by mass or more, 70% by mass or more, or 75% by mass or more. Also, the ratio of monomer units (A-1) to monomer units (A) (i.e., the content of monomer units (A-1) based on the total amount of monomer units (A)) may be, for example, 99.5% by mass or less, and may be 99% by mass or less, 95% by mass or less, 90% by mass or less, 88% by mass or less, 85% by mass or less, 83% by mass or less, or 80% by mass or less.

[0146] The monomer unit (A) may contain monomer units that do not fall under either monomer unit (A') or monomer unit (A-1), i.e., monomer unit (A-2) derived from a compound (monomer (a-2)) having one (meth)acryloyl group and no epoxy group. Examples of monomer (a-2) include the same monomer (a-2) as in the first embodiment described above.

[0147] The proportion of monomer unit (A-2) to monomer unit (A) may be, for example, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass. That is, the content of monomers corresponding to at least one of monomer unit (A) and monomer unit (A-1) in monomer unit (A) may be, for example, 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass, based on the total amount of monomer unit (A).

[0148] The monomer unit (A) may include, for example, a monomer unit (A'') derived from a compound (monomer (a'')) having one (meth)acryloyl group and one epoxy group as monomer unit (A'), and a monomer unit (A-1') derived from a compound (monomer (a-1')) having two or more (meth)acryloyl groups and no epoxy groups as monomer unit (A-1).

[0149] The total amount of monomer units (A'') and monomer units (A-1') may be, for example, 60% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass, based on the total amount of monomer units (A).

[0150] The first polymer may further contain monomer units other than monomer unit (A). That is, the first polymer may further contain monomer units derived from monomers other than acrylic monomer (a). Examples of other monomers include styrene.

[0151] The content of monomer units (A) in the first polymer may be, for example, 80% by mass or more, based on the total amount of all monomer units in the first polymer, and from the viewpoint of obtaining the above-mentioned effects more significantly, it may be 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or even 100% by mass.

[0152] The first polymer may further have monomer units (B-1) derived from monomer (b-1) having a hydroxyl group. Examples of monomer (b-1) include those that are the same as monomer (b-1) in the first embodiment described above. Monomer unit (B-1) may be a monomer unit corresponding to monomer unit (A), monomer unit (A-1), or monomer unit (A-2).

[0153] The proportion of monomer units (B-1) to the total monomer units in the first polymer (i.e., the content of monomer units (B-1) on a basis of the total amount of monomer units in the first polymer) may be, for example, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, or 15% by mass or less, or even 0% by mass.

[0154] If the first polymer has monomer units (B-1), the proportion of monomer units (B-1) to the total monomer units of the first polymer (i.e., the content of monomer units (B-1) on a total basis of the total monomer units of the first polymer) may be, for example, 1% by mass or more, and may be 3% by mass or more, 5% by mass or more, 7% by mass or more, or 10% by mass or more.

[0155] The first polymer may further have monomer units (C-1) derived from monomer (c-1) having a functional group (excluding hydroxyl groups) that reacts with an epoxy group and inhibits ammonia adsorption by the epoxy group. Examples of monomer (c-1) include those that are the same as monomer (c-1) in the first embodiment described above. Monomer units (C-1) may be monomer units corresponding to monomer unit (A), monomer unit (A-1), or monomer unit (A-2).

[0156] The proportion of monomer units (C-1) to the total monomer units of the first polymer (i.e., the content of monomer units (C-1) on a total basis of the total monomer units of the first polymer) may be, for example, 30% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass.

[0157] The ammonia block layer may further contain additives as components other than the first polymer. Examples of additives include silica nanoparticles, fluorine-containing compounds, and silicone compounds.

[0158] The amount of additives is not particularly limited and may be adjusted as appropriate within the range in which the above-described effects can be obtained. The amount of additives may be, for example, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 1% by mass or less, or even 0% by mass, based on the total amount of the ammonia block layer. That is, the amount of the first polymer in the ammonia block layer may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass.

[0159] (Third aspect) The ammonia blocking layer of the third embodiment is a coating film of a coating solution containing a monomer component, a radical polymerization initiator, and a polymer having an epoxy group (hereinafter also referred to as the second polymer). In the third embodiment, the monomer component may contain an acrylic monomer (a) having a (meth)acryloyl group.

[0160] The ammonia blocking layer of the third embodiment is a coating film of a coating solution containing a polymer having epoxy groups (the second polymer), and therefore has epoxy groups (or derivatives thereof) derived from the second polymer. As a result, according to the ammonia blocking layer of the third embodiment, ammonia gas is trapped by the second polymer, preventing the ammonia gas from entering the polarizer, and suppressing the reddening of the polarizer.

[0161] The ammonia block layer of the third embodiment may contain a first polymer and a second polymer, which are polymers of monomer components. The first monomer formed in the third embodiment may be the same as the first monomer in the fourth embodiment described later.

[0162] The monomer component may be, for example, a compound having a (meth)acryloyl group or a polymerizable group (e.g., an ethylenically unsaturated double bond) that can polymerize with a (meth)acryloyl group, and a compound having a (meth)acryloyl group is preferred.

[0163] In a third embodiment, at least a portion of the acrylic monomer (a) may be a polyfunctional monomer (a-1) having two or more (meth)acryloyl groups.

[0164] Monomer (a-1) may be a compound having three or more (meth)acryloyl groups (hereinafter also referred to as monomer (a-1-1)), or a compound having two (meth)acryloyl groups (hereinafter also referred to as monomer (a-1-2)). The number of (meth)acryloyl groups in monomer (a-1) and monomer (a-1-1) may be, for example, 10 or less, 8 or less, 6 or less, or 4 or less.

[0165] Monomer (a-1) may be a cyclic monomer having a cyclic structure or an acyclic monomer not having a cyclic structure, but it is preferable that it be an acyclic monomer. When monomer (a-1) is an acyclic monomer, ester bonds can be more densely present in the formed polymer, and the ammonia blocking properties of the ammonia blocking layer tend to be improved.

[0166] From the viewpoint of making it easier to obtain an ammonia block layer with high layer strength, it is preferable that monomer (a-1) has a high proportion of monomer (a-1-1). The proportion of monomer (a-1-1) in monomer (a-1) (i.e., the content of monomer (a-1-1) on a basis of the total amount of monomer (a-1)) may be, for example, 50% by mass or more, and may be 70% by mass or more, 80% by mass or more, or 85% by mass or more. Alternatively, the proportion of monomer (a-1-1) in monomer (a-1) (i.e., the content of monomer (a-1-1) on a basis of the total amount of monomer (a-1)) may be, for example, 100% by mass or less, and may be 97% by mass or less, 95% by mass or less, or 90% by mass or less.

[0167] Examples of monomers (a-1), monomer (a-1-1), and monomer (a-1-2) are the same as those in the first embodiment described above.

[0168] The proportion of monomer (a-1) in acrylic monomer (a) (i.e., the amount of monomer (a-1) on a total basis of acrylic monomer (a)) may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass.

[0169] Acrylic monomer (a) may contain monomers other than monomer (a-1), such as a compound having one (meth)acryloyl group (hereinafter also referred to as monomer (a-2)).

[0170] Examples of monomer (a-2) include alkyl (meth)acrylates (e.g., methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, etc.). Alternatively, monomer (a-2) may be a monomer having an epoxy group (e.g., glycidyl (meth)acrylate, etc.).

[0171] The proportion of monomer (a-2) in acrylic monomer (a) may be, for example, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass.

[0172] The monomer component may further contain other monomers besides the acrylic monomer (a). The other monomers are those that can be radically polymerized with the acrylic monomer (a). Examples of other monomers include styrene.

[0173] The proportion of acrylic monomer (a) in the monomer component (i.e., the content of acrylic monomer (a) on a basis of the total amount of monomer component) may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass.

[0174] The monomer component may contain monomer (b-1) having a hydroxyl group. Monomer (b-1) may further have a (meth)acryloyl group. Monomer (b-1) may exist, for example, as a byproduct during the synthesis of monomer (a-1). Note that monomer (b-1) may be the monomer corresponding to monomer (a-1) or monomer (a-2).

[0175] The monomer (b-1) content may be, for example, 50% by mass or less based on the total amount of monomer components, and may also be 40% by mass or less, 30% by mass or less, 20% by mass or less, or 15% by mass or less. By reducing the monomer (b-1) content, the consumption of epoxy groups due to the reaction between the hydroxyl groups of monomer (b-1) and the epoxy groups of the second polymer can be avoided, and the reddening of the polarizing plate by ammonia gas can be suppressed more significantly.

[0176] When the monomer component contains monomer (b-1), the amount of monomer (b-1) may be, for example, 1% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass or more, or 10% by mass or more, based on the total amount of the monomer component.

[0177] The monomer component may further contain monomer (c-1) having a functional group (excluding hydroxyl groups) that reacts with the epoxy group and inhibits ammonia adsorption by the epoxy group, but it is desirable that the content of monomer (c-1) be low. The content of monomer (c-1) may be, for example, 30% by mass or less based on the total amount of the monomer component, and may also be 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass. By reducing the content of monomer (c-1), the consumption of epoxy groups can be avoided, and the reddening of the polarizer due to ammonia gas can be suppressed more significantly.

[0178] Examples of functional groups that monomer (c-1) may possess include amino groups and carboxyl groups.

[0179] Note that monomer (c-1) may be monomer (a-1) or monomer (a-2).

[0180] A radical polymerization initiator can be any agent that generates radicals and initiates the polymerization reaction of monomer components. Photoradical polymerization initiators are preferred as radical polymerization initiators.

[0181] Examples of radical polymerization initiators include those identical to the radical polymerization initiator in the first embodiment described above.

[0182] Radical polymerization initiators may be used individually or in combination of two or more types.

[0183] The content of the radical polymerization initiator may be, for example, 0.1 parts by mass or more, 0.5 parts by mass or more, or 1 part by mass or more, per 100 parts by mass of the monomer component. Alternatively, the content of the radical polymerization initiator may be, for example, 15 parts by mass or less, 10 parts by mass or less, 8 parts by mass or less, 6 parts by mass or less, or 5 parts by mass or less, per 100 parts by mass of the monomer component.

[0184] From the viewpoint of avoiding a reduction in effectiveness due to the consumption of epoxy groups, it is desirable that the coating solution substantially contains no cationic polymerization initiators (especially photocatalytic cationic polymerization initiators). Substantially containing no cationic polymerization initiators means, for example, that the content of cationic polymerization initiators is 0.3 parts by mass or less per 100 parts by mass of monomer components. The content of cationic polymerization initiators may be 0.2 parts by mass or less, 0.1 parts by mass or less, 0.01 parts by mass or less, or 0 parts by mass per 100 parts by mass of monomer components.

[0185] The second polymer has epoxy groups.

[0186] The second polymer preferably has monomer units (X) derived from an acrylic monomer (x) having a (meth)acryloyl group. The second polymer may be a polymer of the acrylic monomer (x), or it may be a copolymer of the acrylic monomer (x) with another monomer (e.g., styrene).

[0187] The acrylic monomer (x) may be used alone or in combination of two or more types.

[0188] The monomer unit (X) may have, for example, a monomer unit (X-1) derived from a monomer (x-1) having an epoxy group and a (meth)acryloyl group.

[0189] Examples of monomers (x-1) include glycidyl (meth)acrylate.

[0190] The monomer unit (X) may further have a monomer unit (X-2) derived from a monomer (x-2) that does not have an epoxy group but has a (meth)acryloyl group.

[0191] Examples of monomers (x-2) include alkyl (meth)acrylates (e.g., methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, etc.).

[0192] The ratio of monomer units (X-1) to monomer units (X) (i.e., the content of monomer units (X-1) on a total basis of monomer units (X)) may be, for example, 30% by mass or more, 50% by mass or more, 70% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass, on a total basis of monomer units (X).

[0193] The ratio of monomer units (X-2) to monomer units (X) (i.e., the content of monomer units (X-2) on a total basis of monomer units (X)) may be, for example, 70% by mass or less, 50% by mass or less, 30% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass.

[0194] The second polymer may further have monomer units other than monomer unit (X), i.e., monomer units (Y) derived from monomers other than the acrylic monomer (x) (y).

[0195] Examples of monomers (y) include styrene.

[0196] The proportion of monomer units (Y) in the total monomer units of the second polymer (i.e., the content of monomer units (Y) on a total basis of the total monomer units of the second polymer) may be, for example, 50% by mass or less, 30% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass. That is, the proportion of monomer units (X) in the total monomer units of the second polymer (i.e., the content of monomer units (X) on a total basis of the total monomer units of the second polymer) may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or even 100% by mass.

[0197] The second polymer may be obtained by radical polymerization of the monomers described above.

[0198] A commercially available product may be used as the second polymer. Examples of commercially available products include Marproof® G series (manufactured by Nippon Oil & Fats Co., Ltd.).

[0199] The epoxy equivalent of the second polymer may be, for example, 130 g / eq or more, and may be 150 g / eq or more from the viewpoint of further improving the strength of the ammonia blocking layer. Alternatively, the epoxy equivalent of the second polymer may be, for example, 700 g / eq or less, and may be 600 g / eq or less, 500 g / eq or less, 400 g / eq or less, 350 g / eq or less, or 320 g / eq or less from the viewpoint of obtaining a more pronounced effect of trapping ammonia gas. In other words, by controlling the epoxy equivalent of the second polymer within the above range, an extremely good ammonia blocking effect can be obtained while maintaining high strength of the ammonia blocking layer.

[0200] The weight-average molecular weight of the second polymer may be, for example, 1000 or more, 3000 or more, or 5000 or more. Alternatively, the weight-average molecular weight of the second polymer may be, for example, 1 million or less, and from the viewpoint of further improving dispersibility, it may be 700,000 or less, 500,000 or less, 300,000 or less, 200,000 or less, or 100,000 or less.

[0201] The content of the second polymer may be, for example, 1 part by mass or more per 100 parts by mass of the monomer component, and may also be 2 parts by mass or more, 5 parts by mass or more, 10 parts by mass or more, 12 parts by mass or more, 15 parts by mass or more, 17 parts by mass or more, 20 parts by mass or more, or 25 parts by mass or more. A higher content of the second polymer tends to more significantly suppress reddening due to ammonia gas. Alternatively, the content of the second polymer may be, for example, 100 parts by mass or less per 100 parts by mass of the monomer component, and may also be 50 parts by mass or less, 40 parts by mass or less, 35 parts by mass or less, or 30 parts by mass or less. A lower content of the second polymer tends to further improve the strength of the ammonia block layer.

[0202] The coating solution may further contain other components not listed above.

[0203] The coating liquid may contain, for example, a solvent. The solvent is not particularly limited and should be any solvent capable of dissolving monomer components. A solvent that dries easily is preferred.

[0204] Examples of solvents include ketone-based solvents such as methyl ethyl ketone, acetylacetone, and acetone; ester-based solvents such as dimethyl carbonate, methyl acetate, and ethyl acetate; and aromatic hydrocarbon-based solvents such as toluene.

[0205] The solvent may be appropriately selected depending on the type of monomer component, etc. Furthermore, the solvent may be appropriately selected depending on the type of layer on which the ammonia block layer is formed (e.g., polarizer, base film, etc.). For example, when a cellulose acylate film is used as the base film, using methyl ethyl ketone, methyl acetate, acetone, toluene, etc. as the solvent tends to improve the adhesion between the base film and the ammonia block layer.

[0206] The solvent may be used alone or in combination of two or more types.

[0207] The solvent content is not particularly limited, and may be adjusted as appropriate, for example, so that the solid content concentration of the coating solution falls within the preferred range described later.

[0208] The solid content concentration of the coating solution may be, for example, 10% by mass or more, and may also be 20% by mass or more, 30% by mass or more, or 40% by mass or more. Alternatively, the solid content concentration of the coating solution may be, for example, 90% by mass or less, and may also be 80% by mass or less, 75% by mass or less, or 70% by mass or less.

[0209] The coating solution may further contain additives as components other than those mentioned above. Examples of additives include silica fine particles, fluorine-containing compounds, and silicone-based compounds.

[0210] The amount of additives is not particularly limited and may be adjusted as appropriate within the range in which the above-mentioned effects can be obtained. The amount of additives may be, for example, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 1% by mass or less, or even 0% by mass, based on the total amount of solids in the coating solution. That is, the total amount of monomer components, radical polymerization initiators and second polymers in the coating solution may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass, based on the total amount of solids.

[0211] The coating film formed from the coating liquid functions as an ammonia blocking layer. The coating film can be formed by applying the coating liquid onto a resin layer (e.g., a polarizer, a base film, etc.), and then drying and curing it.

[0212] The drying method is not particularly limited and should be any method that can sufficiently remove the solvent from the coating film. Examples of drying methods include heating, reduced pressure, and combinations thereof.

[0213] The curing method is not particularly limited and can be any method that generates active species from a radical polymerization initiator and polymerizes the monomer components. Curing may be carried out by, for example, light irradiation. Light irradiation may be, for example, ultraviolet irradiation.

[0214] The conditions for light irradiation are not particularly limited; any conditions that allow for the generation of active species from the radical polymerization initiator and the polymerization of monomer components are acceptable. The conditions for light irradiation may be appropriately adjusted depending on the type and amount of monomer components, the type and amount of radical polymerization initiator, the thickness of the coating film, etc.

[0215] The illuminance during light irradiation is, for example, 100-1000 mW / cm². 2 The irradiation dose in light irradiation may be, for example, 50 to 1000 mJ / cm². 2 That's fine.

[0216] (Fourth aspect) The ammonia block layer of the fourth embodiment comprises a first polymer having monomer units (A) derived from an acrylic monomer (a) having a (meth)acryloyl group, and a second polymer having an epoxy group.

[0217] The ammonia blocking layer of the fourth embodiment contains a second polymer having epoxy groups, and the epoxy groups (or derivatives thereof) of the second polymer trap the ammonia gas. Therefore, the ammonia blocking layer of the fourth embodiment prevents the ammonia gas from entering the polarizer, and the reddening of the polarizer is suppressed.

[0218] The ammonia block layer in the fourth embodiment may be a layer formed from the coating liquid in the third embodiment described above.

[0219] In a fourth embodiment, at least a portion of the monomer unit (A) may be a monomer unit (A-1) derived from a monomer (a-1) having two or more (meth)acryloyl groups.

[0220] The monomer unit (A-1) may be a monomer unit (A-1-1) derived from a compound having three or more (meth)acryloyl groups (monomer (a-1-1)), or it may be a monomer unit (A-1-2) derived from a compound having two (meth)acryloyl groups (monomer (a-1-2)).

[0221] Examples of monomers (a-1), monomer (a-1-1), and monomer (a-1-2) are the same as those in the first embodiment described above.

[0222] From the viewpoint of making it easier to obtain an ammonia block layer with high layer strength, it is preferable that the proportion of monomer units (A-1-1) is high. The proportion of monomer units (A-1-1) in monomer units (A-1) (i.e., the content of monomer units (A-1-1) based on the total amount of monomer units (A-1)) may be, for example, 50% by mass or more, and may be 70% by mass or more, 80% by mass or more, or 85% by mass or more. Also, the proportion of monomer units (A-1-1) in monomer units (A-1) (i.e., the content of monomer units (A-1-1) based on the total amount of monomer units (A-1)) may be, for example, 100% by mass or less, and may be 97% by mass or less, 95% by mass or less, or 90% by mass or less.

[0223] The ratio of monomer units (A-1) to monomer units (A) (i.e., the content of monomer units (A-1) on a total basis of monomer units (A)) may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass.

[0224] The monomer unit (A) may contain monomer units that do not correspond to monomer unit (A-1), i.e., monomer unit (A-2) derived from a compound having one (meth)acryloyl group (monomer (a-2)).

[0225] Examples of monomer (a-2) include the same monomer (a-2) as in the third embodiment described above.

[0226] The ratio of monomer units (A-2) to monomer units (A) (i.e., the content of monomer units (A-2) on a total basis of monomer units (A)) may be, for example, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass.

[0227] The first polymer may further contain monomer units other than monomer unit (A). That is, the first polymer may further contain monomer units derived from monomers other than acrylic monomer (a). Examples of other monomers include styrene.

[0228] The content of monomer units (A) in the first polymer may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass, based on the total amount of all monomer units in the first polymer.

[0229] The first polymer may further have monomer units (B-1) derived from monomer (b-1) having a hydroxyl group. Examples of monomer (b-1) include those that are the same as monomer (b-1) in the first embodiment described above. Monomer unit (B-1) may be a monomer unit corresponding to monomer unit (A), monomer unit (A-1), or monomer unit (A-2).

[0230] The proportion of monomer units (B-1) to the total monomer units in the first polymer (i.e., the content of monomer units (B-1) on a basis of the total amount of monomer units in the first polymer) may be, for example, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, or 15% by mass or less, or even 0% by mass.

[0231] If the first polymer has monomer units (B-1), the proportion of monomer units (B-1) to the total monomer units of the first polymer (i.e., the content of monomer units (B-1) on a total basis of the total monomer units of the first polymer) may be, for example, 1% by mass or more, and may be 3% by mass or more, 5% by mass or more, 7% by mass or more, or 10% by mass or more.

[0232] The first polymer may further have monomer units (C-1) derived from monomer (c-1) having a functional group (excluding hydroxyl groups) that reacts with an epoxy group and inhibits ammonia adsorption by the epoxy group. Examples of monomer (c-1) include those that are the same as monomer (c-1) in the first embodiment described above. Monomer units (C-1) may be monomer units corresponding to monomer unit (A), monomer unit (A-1), or monomer unit (A-2).

[0233] The proportion of monomer units (C-1) to the total monomer units of the first polymer (i.e., the content of monomer units (C-1) on a total basis of the total monomer units of the first polymer) may be, for example, 30% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass.

[0234] Examples of the second polymer include the same polymer as the second polymer in the third embodiment described above.

[0235] The content of the second polymer may be, for example, 1 part by mass or more per 100 parts by mass of the first polymer, and may also be 2 parts by mass or more, 5 parts by mass or more, 10 parts by mass or more, 12 parts by mass or more, 15 parts by mass or more, 17 parts by mass or more, 20 parts by mass or more, or 25 parts by mass or more. A higher content of the second polymer tends to more significantly suppress reddening due to ammonia gas. Alternatively, the content of the second polymer may be, for example, 100 parts by mass or less per 100 parts by mass of the first polymer, and may also be 50 parts by mass or less, 40 parts by mass or less, 35 parts by mass or less, or 30 parts by mass or less. A lower content of the second polymer tends to further improve the strength of the ammonia block layer.

[0236] The ammonia block layer may further contain additives as components other than the first and second polymers. Examples of additives include silica nanoparticles, fluorine-containing compounds, and silicone compounds.

[0237] The amount of additives is not particularly limited and may be adjusted as appropriate within the range in which the above-described effects can be obtained. The amount of additives may be, for example, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 1% by mass or less, or even 0% by mass, based on the total amount of the ammonia block layer. That is, the total amount of the first polymer and the second polymer in the ammonia block layer may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass.

[0238] (Fifth aspect) The ammonia blocking layer of the fifth embodiment is a coating film of a coating solution containing a monomer component, a radical polymerization initiator, and a rosin compound having an acid value of 100 mg KOH / g or more and 500 mg KOH / g or less. In the fifth embodiment, the monomer component may contain an acrylic monomer (a) having a (meth)acryloyl group.

[0239] The ammonia blocking layer of the fifth embodiment is a coating film of a coating solution containing a rosin compound having a predetermined acid value, and therefore has acidic groups (e.g., carboxyl groups) derived from the rosin compound. For this reason, according to the ammonia blocking layer of the fifth embodiment, ammonia gas is trapped by the rosin compound, preventing the ammonia gas from entering the polarizer, and suppressing the reddening of the polarizer.

[0240] In the ammonia-blocking layer of the fifth aspect, a rosin compound is adopted as a component for introducing an acidic group. In the fifth aspect, by adopting the rosin compound, the moisture permeability of the ammonia-blocking layer is reduced. The reason is presumably that the flat molecular structure of the rosin compound tends to be oriented in the in-plane direction of the ammonia-blocking layer, inhibiting the passage of water molecules in the vertical direction. Therefore, usually, when an acidic group is introduced, the moisture permeability of the ammonia-blocking layer tends to increase (i.e., the moisture resistance decreases). However, according to the coating liquid of the fifth aspect, an ammonia-blocking layer with a low moisture permeability can be formed while introducing an acidic group. When the moisture permeability of the ammonia-blocking layer is low, the intrusion of ammonia molecules into the polarizer together with water molecules can be suppressed, and red discoloration is also suppressed in this regard.

[0241] The ammonia-blocking layer of the fifth aspect may include a first polymer that is a polymer of a monomer component and a rosin compound. The first monomer formed in the fifth aspect may be the same as the first monomer in the sixth aspect described below.

[0242] The monomer component may be, for example, a compound having a (meth)acryloyl group or a polymerizable group (e.g., an ethylenically unsaturated double bond) that is polymerizable with a (meth)acryloyl group, and a compound having a (meth)acryloyl group is preferred.

[0243] In the fifth aspect, at least a part of the acrylic monomer (a) may be a polyfunctional monomer (a-1) having two or more (meth)acryloyl groups.

[0244] The monomer (a-1) may be a compound having three or more (meth)acryloyl groups (hereinafter also referred to as monomer (a-1-1)), or a compound having two (meth)acryloyl groups (hereinafter also referred to as monomer (a-1-2)). The number of (meth)acryloyl groups possessed by the monomer (a-1) and the monomer (a-1-1) may be, for example, 10 or less, 8 or less, 6 or less, or 4 or less.

[0245] Monomer (a-1) may be a cyclic monomer having a cyclic structure or an acyclic monomer not having a cyclic structure, but it is preferable that it be an acyclic monomer. When monomer (a-1) is an acyclic monomer, ester bonds can be more densely present in the formed polymer, and the ammonia blocking properties of the ammonia blocking layer tend to be improved.

[0246] From the viewpoint of making it easier to obtain an ammonia block layer with high layer strength, it is preferable that monomer (a-1) has a high proportion of monomer (a-1-1). The proportion of monomer (a-1-1) in monomer (a-1) (i.e., the content of monomer (a-1-1) on a basis of the total amount of monomer (a-1)) may be, for example, 50% by mass or more, and may be 70% by mass or more, 80% by mass or more, or 85% by mass or more. Alternatively, the proportion of monomer (a-1-1) in monomer (a-1) (i.e., the content of monomer (a-1-1) on a basis of the total amount of monomer (a-1)) may be, for example, 100% by mass or less, and may be 97% by mass or less, 95% by mass or less, or 90% by mass or less.

[0247] Examples of monomers (a-1), monomer (a-1-1), and monomer (a-1-2) are the same as those in the first embodiment described above.

[0248] The proportion of monomer (a-1) in acrylic monomer (a) (i.e., the amount of monomer (a-1) on a total basis of acrylic monomer (a)) may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass.

[0249] Acrylic monomer (a) may contain monomers other than monomer (a-1), such as a compound having one (meth)acryloyl group (hereinafter also referred to as monomer (a-2)).

[0250] Examples of monomers (a-2) include alkyl (meth)acrylates (e.g., methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, etc.).

[0251] The proportion of monomer (a-2) in acrylic monomer (a) may be, for example, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass.

[0252] The monomer component may further contain other monomers besides the acrylic monomer (a). The other monomers are those that can be radically polymerized with the acrylic monomer (a). Examples of other monomers include styrene.

[0253] The proportion of acrylic monomer (a) in the monomer component (i.e., the content of acrylic monomer (a) on a basis of the total amount of monomer component) may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass.

[0254] The monomer component may contain monomer (b-1) having a hydroxyl group. Monomer (b-1) may further have a (meth)acryloyl group. Monomer (b-1) may exist, for example, as a byproduct during the synthesis of monomer (a-1). Note that monomer (b-1) may be the monomer corresponding to monomer (a-1) or monomer (a-2).

[0255] The monomer (b-1) content may be, for example, 50% by mass or less based on the total amount of monomer components, and may also be 40% by mass or less, 30% by mass or less, 20% by mass or less, or 15% by mass or less. By reducing the monomer (b-1) content, the increase in moisture permeability due to the hydroxyl group of monomer (b-1) is suppressed, and the reddening of the polarizing plate due to ammonia gas can be suppressed more significantly.

[0256] When the monomer component contains monomer (b-1), the amount of monomer (b-1) may be, for example, 1% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass or more, or 10% by mass or more, based on the total amount of the monomer component.

[0257] The monomer component may further contain monomer (c-1), which has a functional group that reacts with the carboxyl group and inhibits ammonia adsorption by the carboxyl group, but it is desirable that the content of monomer (c-1) be low. The content of monomer (c-1) may be, for example, 30% by mass or less based on the total amount of the monomer component, and may also be 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass. By reducing the content of monomer (c-1), the consumption of the carboxyl group can be avoided, and the reddening of the polarizing plate due to ammonia gas can be suppressed more significantly.

[0258] Examples of functional groups that monomer (c-1) may possess include amino groups and epoxy groups.

[0259] Note that monomer (c-1) may be monomer (a-1) or monomer (a-2).

[0260] A radical polymerization initiator can be any agent that generates radicals and initiates the polymerization reaction of monomer components. Photoradical polymerization initiators are preferred as radical polymerization initiators.

[0261] Examples of radical polymerization initiators include those identical to the radical polymerization initiator in the first embodiment described above.

[0262] The radical polymerization initiator may be used alone or in combination of two or more kinds.

[0263] The content of the radical polymerization initiator may be, for example, 0.1 part by mass or more, 0.5 part by mass or more, or 1 part by mass or more with respect to 100 parts by mass of the monomer component. Further, the content of the radical polymerization initiator may be, for example, 15 parts by mass or less, 10 parts by mass or less, 8 parts by mass or less, 6 parts by mass or less, or 5 parts by mass or less with respect to 100 parts by mass of the monomer component.

[0264] The rosin compound is rosin or its derivative and has an acid value of 100 mgKOH / g or more and 500 mgKOH / g or less.

[0265] The rosin compound may be, for example, at least one selected from the group consisting of rosin, hydrogenated rosin (also referred to as hydrogenated rosin), acid-modified rosin, and hydrogenated acid-modified rosin (also referred to as hydrogenated acid-modified rosin).

[0266] Examples of rosin include unmodified rosin such as tall oil rosin, gum rosin, and wood rosin, which are mainly composed of resin acids such as abietic acid, levopimaric acid, pultrunic acid, neoabietic acid, dehydroabietic acid, and dihydroabietic acid.

[0267] The hydrogenated rosin may be, for example, one obtained by hydrogenating the above rosin. The hydrogenated rosin may be, for example, one having a tetrahydro form such as tetrahydroabietic acid as a main component (for example, 50% by mass or more).

[0268] Examples of the acid-modified rosin include unsaturated acid-modified rosin obtained by adding an unsaturated acid (for example, maleic acid, fumaric acid, acrylic acid, etc.) to the above rosin by a Diels-Alder reaction. Examples of the unsaturated acid-modified rosin include maleopimaric acid obtained by adding maleic acid to rosin, fumaropimaric acid obtained by adding fumaric acid to rosin, and acrylopimaric acid obtained by adding acrylic acid to rosin.

[0269] Hydrogenated acid-modified rosin may be, for example, a hydrogenated version of the above-mentioned acid-modified rosin. By using hydrogenated acid-modified rosin, discoloration of the hard coat layer caused by oxidation of double bonds in the rosin compound can be suppressed.

[0270] Rosin compounds may be used individually or in combination of two or more types.

[0271] Commercially available rosin compounds may be used. Examples of commercially available rosin compounds include Pine Crystal KR-85, Pine Crystal KR-120, Pine Crystal KR-612, Pine Crystal KR-614, Pine Crystal KE-100, Pine Crystal KE-311, Pine Crystal KE-359, Pine Crystal KE-604, Pine Crystal 30PX, Pine Crystal D-6011, Pine Crystal D-6154, Pine Crystal D-6240, Pine Crystal KM-1500, and Pine Crystal KM-1550 (all are trade names; ultra-pale rosin derivatives, manufactured by Arakawa Chemical Industries, Ltd.).

[0272] The acid value of the rosin compound is 100 mg KOH / g or higher, and may be 150 mg KOH / g or higher, 200 mg KOH / g or higher, or 280 mg KOH / g or higher, from the viewpoint of obtaining a more pronounced effect in trapping ammonia gas. Alternatively, the acid value of the rosin compound may be 500 mg KOH / g or lower, and may be 400 mg KOH / g or lower, from the viewpoint of obtaining a stronger ammonia blocking layer. In other words, the acid value of the rosin compound may be, for example, 100 to 500 mg KOH / g, 150 to 400 mg KOH / g, 200 to 400 mg KOH / g, or 280 to 400 mg KOH / g. By controlling the acid value of the rosin compound within this range, an extremely good ammonia blocking effect can be obtained while maintaining a high strength of the ammonia blocking layer.

[0273] From the viewpoint of ensuring that the acid value is within the preferred range described above, at least one rosin compound selected from the group consisting of acid-modified rosin and hydrogenated acid-modified rosin is preferred. Furthermore, from the viewpoint of suppressing discoloration of the ammonia block layer, at least one rosin compound selected from the group consisting of hydrogenated rosin and hydrogenated acid-modified rosin is preferred. Moreover, from the viewpoint of achieving both a suitable acid value and suppression of discoloration of the ammonia block layer, hydrogenated acid-modified rosin is more preferred as the rosin compound.

[0274] The softening point of the rosin compound may be, for example, 70°C to 170°C. If the softening point of the rosin compound is 70°C or higher, softening of the ammonia block layer is avoided, and the strength and blocking properties of the ammonia block layer tend to be improved. If the softening point of the rosin compound is 170°C or lower, solubility in the solvent is good, and the haze of the ammonia block layer tends to be less likely to increase.

[0275] In this specification, the softening point of rosin compounds refers to the softening point measured by the ring-ball method according to JIS K-2531.

[0276] The rosin compound content may be, for example, 1 part by mass or more per 100 parts by mass of monomer components, and may also be 2 parts by mass or more, 5 parts by mass or more, 10 parts by mass or more, 12 parts by mass or more, 15 parts by mass or more, 17 parts by mass or more, 20 parts by mass or more, or 25 parts by mass or more. A higher rosin compound content tends to improve the ammonia blocking properties of the ammonia blocking layer. Alternatively, the rosin compound content may be, for example, 100 parts by mass or less per 100 parts by mass of monomer components, and may also be 50 parts by mass or less, 40 parts by mass or less, 35 parts by mass or less, or 30 parts by mass or less. A lower rosin compound content tends to improve the strength of the ammonia blocking layer.

[0277] The coating solution may further contain other components not listed above.

[0278] The coating liquid may contain, for example, a solvent. The solvent is not particularly limited and should be any solvent capable of dissolving monomer components. A solvent that dries easily is preferred.

[0279] Examples of solvents include ketone-based solvents such as methyl ethyl ketone, acetylacetone, and acetone; ester-based solvents such as dimethyl carbonate, methyl acetate, and ethyl acetate; and aromatic hydrocarbon-based solvents such as toluene.

[0280] The solvent may be appropriately selected depending on the type of monomer component, etc. Furthermore, the solvent may be appropriately selected depending on the type of layer on which the ammonia block layer is formed (e.g., polarizer, base film, etc.). For example, when a cellulose acylate film is used as the base film, using methyl ethyl ketone, methyl acetate, acetone, toluene, etc. as the solvent tends to improve the adhesion between the base film and the ammonia block layer.

[0281] The solvent may be used alone or in combination of two or more types.

[0282] The solvent content is not particularly limited, and may be adjusted as appropriate, for example, so that the solid content concentration of the coating solution falls within the preferred range described later.

[0283] The solid content concentration of the coating solution may be, for example, 10% by mass or more, and may also be 20% by mass or more, 30% by mass or more, or 40% by mass or more. Alternatively, the solid content concentration of the coating solution may be, for example, 90% by mass or less, and may also be 80% by mass or less, 75% by mass or less, or 70% by mass or less.

[0284] The coating solution may further contain additives as components other than those mentioned above. Examples of additives include silica fine particles, fluorine-containing compounds, and silicone-based compounds.

[0285] The amount of additives is not particularly limited and may be adjusted as appropriate within the range in which the above-mentioned effects can be obtained. The amount of additives may be, for example, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 1% by mass or less, or even 0% by mass, based on the total amount of solids in the coating solution. That is, the total amount of monomer components, radical polymerization initiators and rosin compounds in the coating solution may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass, based on the total amount of solids.

[0286] The coating film formed from the coating liquid functions as an ammonia blocking layer. The coating film can be formed by applying the coating liquid onto a resin layer (e.g., a polarizer, a base film, etc.), and then drying and curing it.

[0287] The drying method is not particularly limited and should be any method that can sufficiently remove the solvent from the coating film. Examples of drying methods include heating, reduced pressure, and combinations thereof.

[0288] The curing method is not particularly limited and can be any method that generates active species from a radical polymerization initiator and polymerizes the monomer components. Curing may be carried out by, for example, light irradiation. Light irradiation may be, for example, ultraviolet irradiation.

[0289] The conditions for light irradiation are not particularly limited; any conditions that allow for the generation of active species from the radical polymerization initiator and the polymerization of monomer components are acceptable. The conditions for light irradiation may be appropriately adjusted depending on the type and amount of monomer components, the type and amount of radical polymerization initiator, the thickness of the coating film, etc.

[0290] The illuminance during light irradiation is, for example, 100-1000 mW / cm². 2 The irradiation dose in light irradiation may be, for example, 50 to 1000 mJ / cm². 2 That's fine.

[0291] (Sixth aspect) The ammonia block layer of the sixth embodiment comprises a first polymer having monomer units (A) derived from an acrylic monomer (a) having a (meth)acryloyl group, and a rosin compound having an acid value of 100 mg KOH / g or more and 500 mg KOH / g or less.

[0292] The ammonia blocking layer of the sixth embodiment contains a rosin compound, and the ammonia gas is trapped by the acidic groups (e.g., carboxyl groups) of the rosin compound. Therefore, the ammonia blocking layer of the sixth embodiment prevents ammonia gas from entering the polarizer, and the reddening of the polarizer is suppressed.

[0293] Furthermore, in the ammonia block layer of the sixth embodiment, a rosin compound is used as a component for introducing acidic groups. In the sixth embodiment, the use of a rosin compound reduces the moisture permeability of the ammonia block layer. This is presumed to be because the flat molecular structure of the rosin compound tends to orient in the in-plane direction of the ammonia block layer, inhibiting the passage of water molecules in the perpendicular direction. For this reason, while normally the moisture permeability of the ammonia block layer tends to improve (i.e., moisture resistance decreases) when acidic groups are introduced, the sixth embodiment maintains low moisture permeability while introducing acidic groups. Low moisture permeability of the ammonia block layer suppresses the penetration of ammonia molecules into the polarizer along with water molecules, and in this respect, reddening is also suppressed.

[0294] The ammonia block layer of the sixth embodiment may be a layer formed from the coating liquid of the fifth embodiment described above.

[0295] In the sixth embodiment, at least a portion of the monomer unit (A) may be a monomer unit (A-1) derived from a monomer (a-1) having two or more (meth)acryloyl groups.

[0296] The monomer unit (A-1) may be a monomer unit (A-1-1) derived from a compound having three or more (meth)acryloyl groups (monomer (a-1-1)), or it may be a monomer unit (A-1-2) derived from a compound having two (meth)acryloyl groups (monomer (a-1-2)).

[0297] Examples of monomers (a-1), monomer (a-1-1), and monomer (a-1-2) are the same as those in the first embodiment described above.

[0298] From the viewpoint of making it easier to obtain an ammonia block layer with high layer strength, it is preferable that the proportion of monomer units (A-1-1) is high. The proportion of monomer units (A-1-1) in monomer units (A-1) (i.e., the content of monomer units (A-1-1) based on the total amount of monomer units (A-1)) may be, for example, 50% by mass or more, and may be 70% by mass or more, 80% by mass or more, or 85% by mass or more. Also, the proportion of monomer units (A-1-1) in monomer units (A-1) (i.e., the content of monomer units (A-1-1) based on the total amount of monomer units (A-1)) may be, for example, 100% by mass or less, and may be 97% by mass or less, 95% by mass or less, or 90% by mass or less.

[0299] The ratio of monomer units (A-1) to monomer units (A) (i.e., the content of monomer units (A-1) on a total basis of monomer units (A)) may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass.

[0300] The monomer unit (A) may contain monomer units that do not correspond to monomer unit (A-1), i.e., monomer unit (A-2) derived from a compound having one (meth)acryloyl group (monomer (a-2)).

[0301] Examples of monomer (a-2) include the same monomer (a-2) as in the fifth embodiment described above.

[0302] The ratio of monomer units (A-2) to monomer units (A) (i.e., the content of monomer units (A-2) on a total basis of monomer units (A)) may be, for example, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass.

[0303] The first polymer may further contain monomer units other than monomer unit (A). That is, the first polymer may further contain monomer units derived from monomers other than acrylic monomer (a). Examples of other monomers include styrene.

[0304] The content of monomer units (A) in the first polymer may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, 90% by mass or more, 95% by mass or more, 97% by mass or more, or 99% by mass or more, or 100% by mass, based on the total amount of all monomer units in the first polymer.

[0305] The first polymer may further have monomer units (B-1) derived from monomer (b-1) having a hydroxyl group. Examples of monomer (b-1) include those that are the same as monomer (b-1) in the first embodiment described above. Monomer unit (B-1) may be a monomer unit corresponding to monomer unit (A), monomer unit (A-1), or monomer unit (A-2).

[0306] The proportion of monomer units (B-1) to the total monomer units in the first polymer (i.e., the content of monomer units (B-1) on a basis of the total amount of monomer units in the first polymer) may be, for example, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, or 15% by mass or less, or even 0% by mass.

[0307] If the first polymer has monomer units (B-1), the proportion of monomer units (B-1) to the total monomer units of the first polymer (i.e., the content of monomer units (B-1) on a total basis of the total monomer units of the first polymer) may be, for example, 1% by mass or more, and may be 3% by mass or more, 5% by mass or more, 7% by mass or more, or 10% by mass or more.

[0308] The first polymer may further contain monomer units (C-1) derived from monomers (c-1) that react with carboxyl groups and have functional groups that inhibit ammonia adsorption by carboxyl groups. The proportion of monomer units (C-1) to the total monomer units of the first polymer (i.e., the content of monomer units (C-1) on a basis of the total amount of monomer units of the first polymer) may be, for example, 30% by mass or less, 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, or even 0% by mass. By reducing the content of monomer units (C-1), the consumption of carboxyl groups can be avoided, and the reddening of the polarizer due to ammonia gas can be suppressed more significantly.

[0309] Examples of functional groups that monomer (c-1) may possess include amino groups and epoxy groups.

[0310] Note that monomer (c-1) may be monomer (a-1) or monomer (a-2).

[0311] Examples of rosin compounds include those identical to the rosin compound described in the fifth embodiment above.

[0312] The rosin compound content may be, for example, 1 part by mass or more per 100 parts by mass of the first polymer, and may also be 2 parts by mass or more, 5 parts by mass or more, 10 parts by mass or more, 12 parts by mass or more, 15 parts by mass or more, 17 parts by mass or more, 20 parts by mass or more, or 25 parts by mass or more. A higher rosin compound content tends to more significantly suppress reddening due to ammonia gas. Alternatively, the rosin compound content may be, for example, 100 parts by mass or less per 100 parts by mass of the first polymer, and may also be 50 parts by mass or less, 40 parts by mass or less, 35 parts by mass or less, or 30 parts by mass or less. A lower rosin compound content tends to further improve the strength of the ammonia block layer.

[0313] The ammonia block layer may further contain additives as components other than the first polymer and rosin compound. Examples of additives include silica nanoparticles, fluorine-containing compounds, and silicone compounds.

[0314] The amount of additives is not particularly limited and may be adjusted as appropriate within the range in which the above-described effects can be obtained. The amount of additives may be, for example, 30% by mass or less, 20% by mass or less, 10% by mass or less, 5% by mass or less, or 1% by mass or less, or even 0% by mass, based on the total amount of the ammonia block layer. That is, the total amount of the first polymer and rosin compound in the ammonia block layer may be, for example, 70% by mass or more, 80% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, or even 100% by mass.

[0315] The following describes preferred examples of the polarizing plate of this embodiment with reference to the drawings. However, the polarizing plate of this embodiment is not limited to the following examples.

[0316] Figure 1 is a schematic cross-sectional view showing an example of a polarizing plate. The polarizing plate 10 shown in Figure 1 comprises a polarizer 11, a first laminated layer 14 laminated on one side of the polarizer 11, a first base film 12 laminated on the side of the polarizer 11 via the first laminated layer 14, a second laminated layer 15 laminated on the other side of the polarizer 11, a second base film 13 laminated on the other side of the polarizer 11 via the second laminated layer 15, and an ammonia block layer 16 laminated on the polarizer 11 side of the first base film 12.

[0317] The first base film 12 may be a protective film laminated on the viewing side, and the second base film 13 may be a protective film laminated on the panel side. The first base film 12 may be laminated with an ammonia block layer 16 on one side and then laminated to the polarizer 11, for example, using a roll laminating machine. The second base film 13 may be laminated to the polarizer 11, for example, using a roll laminating machine.

[0318] Figure 2 is a schematic cross-sectional view showing an example of a polarizing plate. The polarizing plate 20 shown in Figure 2 comprises a polarizer 21, an ammonia block layer 26 laminated on one side of the polarizer 21, a first bonding layer 24 laminated on the ammonia block layer 26, a first base film 22 laminated on one side of the polarizer 21 via the first bonding layer 24, a second bonding layer 25 laminated on the other side of the polarizer 21, and a second base film 23 laminated on the other side of the polarizer 21 via the second bonding layer 25.

[0319] The first base film 22 may be a protective film laminated on the viewing side, and the second base film 23 may be a protective film laminated on the panel side. The first base film 22 may be formed by laminating an ammonia block layer 26 onto one side of the polarizer 21 and then laminating it to the polarizer 21, for example, using a roll laminating machine. The second base film 23 may be formed by laminating it to the polarizer 21, for example, using a roll laminating machine.

[0320] Figure 3 is a schematic cross-sectional view showing an example of a polarizing plate. The polarizing plate 30 shown in Figure 3 comprises a polarizer 31, a first laminated layer 34 laminated on one side of the polarizer 31, a first base film 32 laminated on the side of the polarizer 31 via the first laminated layer 34, a second laminated layer 35 laminated on the other side of the polarizer 31, a second base film 33 laminated on the other side of the polarizer 31 via the second laminated layer 35, and an ammonia block layer 36 laminated on the polarizer 31 side of the second base film 33.

[0321] The first base film 32 may be a protective film laminated on the viewing side, and the second base film 33 may be a protective film laminated on the panel side. The first base film 32 may be laminated to the polarizer 31 using, for example, a roll laminating machine. The second base film 33 may be laminated to the polarizer 31 using, for example, a roll laminating machine after laminating an ammonia block layer 36 on one side.

[0322] Figure 4 is a schematic cross-sectional view showing an example of a polarizing plate. The polarizing plate 40 shown in Figure 4 comprises a polarizer 41, a first ammonia block layer 47 laminated on one side of the polarizer 41, a first bonding layer 44 laminated on the first ammonia block layer 47, a first base film 42 laminated on one side of the polarizer 41 via the first bonding layer 44, a second bonding layer 45 laminated on the other side of the polarizer 41, a second base film 43 laminated on the other side of the polarizer 41 via the second bonding layer 45, and a second ammonia block layer 46 laminated on the polarizer 41 side of the first base film 42.

[0323] The first base film 42 may be a protective film laminated on the viewing side, and the second base film 43 may be a protective film laminated on the panel side. The first base film 42 may be laminated to a polarizer 41 having a second ammonia block layer 46 on one side, and then laminated to a polarizer 41 having a first ammonia block layer 47 on one side, for example using a roll laminating machine. The second base film 43 may be laminated to the polarizer 41, for example using a roll laminating machine.

[0324] Figure 5 is a schematic cross-sectional view showing an example of a polarizing plate. The polarizing plate 50 shown in Figure 5 comprises a polarizer 51, a first laminated layer 54 laminated on one surface of the polarizer 51, a first base film 52 laminated on one side of the polarizer 51 via the first laminated layer 54, a first ammonia block layer 56 laminated on the polarizer 51 side of the first base film 52, a second ammonia block layer 57 laminated on the other side of the polarizer 51, a second laminated layer 55 laminated on the second ammonia block layer 57, and a second base film 53 laminated on the other side of the polarizer 51 via the second laminated layer 55.

[0325] The first base film 52 may be a protective film laminated on the viewing side, and the second base film 53 may be a protective film laminated on the panel side. The first base film 52 may be formed by laminating a first ammonia block layer 56 onto one side and then laminating it to the polarizer 51, for example, using a roll laminating machine. The second base film 53 may be formed by laminating a second ammonia block layer 57 to the polarizer 51, for example, using a roll laminating machine.

[0326] Figure 6 is a schematic cross-sectional view showing an example of a polarizing plate. The polarizing plate 60 shown in Figure 6 comprises a polarizer 61, a first laminated layer 64 laminated on one side of the polarizer 61, a first base film 62 laminated on one side of the polarizer 61 via the first laminated layer 64, a first ammonia block layer 66 laminated on the other side of the polarizer 61, a second laminated layer 65 laminated on the first ammonia block layer 66, a second base film 63 laminated on the other side of the polarizer 61 via the second laminated layer 65, and a second ammonia block layer 67 laminated on the polarizer 61 side of the second base film 63.

[0327] The first base film 62 may be a protective film laminated on the viewing side, and the second base film 63 may be a protective film laminated on the panel side. The first base film 62 may be laminated to the polarizer 61 using, for example, a roll laminating machine. The second base film may be laminated to the polarizer 61, which has a second ammonia block layer 67 laminated on one side and then a first ammonia block layer 66 laminated on one side, using, for example, a roll laminating machine.

[0328] <Image display device> The image display device of this embodiment comprises the polarizing plate and the image display panel described above.

[0329] In the image display device of this embodiment, the polarizing plate may be laminated on the image display panel via a third bonding layer.

[0330] The image display device of this embodiment may further include a transparent member laminated on the side of the polarizing plate opposite to the image display panel. The transparent member may be laminated with the polarizing plate via a fourth bonding layer.

[0331] The image display panel is not particularly limited and may be appropriately selected from known image display panels. Examples of image display panels include liquid crystal display panels, organic electroluminescent (organic EL) display panels, inorganic electroluminescent (inorganic EL) display panels, plasma display panels, and field emission type display panels.

[0332] Examples of transparent components include a front transparent plate (window layer) and a touch panel. A transparent plate with appropriate mechanical strength and thickness is preferred for the front transparent plate. Examples of such transparent plates include transparent resin plates such as acrylic resin and polycarbonate resin, glass plates, and laminates thereof. Examples of touch panels include various types of touch panels such as resistive, capacitive, optical, and ultrasonic touch panels, glass plates with touch sensor functionality, and transparent resin plates with touch sensor functionality.

[0333] The third and fourth bonding layers may be adhesive layers or curable adhesive layers. Examples of adhesive layers and curable adhesive layers are the same as those described above. The third bonding layer is preferably an adhesive layer.

[0334] The image display device may further comprise other layers besides those described above. These other layers may be appropriately selected from, for example, layers used in known image display devices. The image display device may also further comprise a bonding layer for bonding these layers to the other layers.

[0335] Figure 7 is a schematic cross-sectional view showing an example of an image display device. As shown in Figure 7, the image display device 100 comprises a polarizing plate 110, an image display panel 120, and a transparent member 130. In the image display device 100, the image display panel 120 is laminated to one side of the polarizing plate 110 via a third bonding layer 140, and the transparent member 130 is laminated to the other side of the polarizing plate 110 via a fourth bonding layer 150.

[0336] In the image display device 100, the image display panel 20 is laminated on the second base film side of the polarizing plate 110, and the transparent member 30 may be laminated on the first base film side of the polarizing plate 110.

[0337] The polarizing plate 110 may be, for example, a polarizing plate having any of the layer configurations (S1) to (S44) described above. Alternatively, the polarizing plate 110 may be, for example, the polarizing plate 10, polarizing plate 20, polarizing plate 30, polarizing plate 40, polarizing plate 50, or polarizing plate 60 described above.

[0338] Applications of the image display device of this embodiment include, for example, televisions, personal computers, mobile devices (e.g., mobile phones, tablet terminals, etc.), and in-vehicle applications. Specific examples of in-vehicle applications include car navigation systems, speedometers, touch panels for air conditioners, backup monitors, and rear monitors.

[0339] The polarizing plate and image display device of this embodiment are less prone to reddening of the polarizing plate even when exposed to high-temperature environments. For this reason, the polarizing plate and image display device of this embodiment can be suitably used in applications where they may be exposed to high-temperature environments for extended periods. For example, in automotive applications such as car navigation systems and backup monitors, the polarizing plate and image display device may be exposed to high-temperature environments for extended periods. For this reason, the polarizing plate and image display device of this embodiment can be suitably used in automotive applications.

[0340] In this embodiment, "high temperature environment" means an environment of 100°C or higher, and may be, for example, an environment of 105°C or higher. Also, "long period of time" means 100 hours or more, and may be, for example, 120 hours or more.

[0341] The source of ammonia gas is not particularly limited. Examples of ammonia gas include ammonia gas present in the air, and ammonia gas generated in the storage, transportation, and usage environments of polarizing plates and image display devices.

[0342] While preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments described above. [Examples]

[0343] The present disclosure will be described in more detail below with reference to examples, but the present disclosure is not limited to these examples.

[0344] (Manufacturing Example 1: Fabrication of a polarizer) A 30 μm thick polyvinyl alcohol-based resin film was immersed in pure water at 21.5°C for 79 seconds (swelling step), and then immersed for 151 seconds in an aqueous solution at 23°C with a mass ratio of potassium iodide / boric acid / water of 2 / 2 / 100 and containing 1.0 mM iodine (dyeing step). Subsequently, the film removed from the aqueous solution was immersed for 76 seconds in an aqueous solution at 68.5°C with a mass ratio of potassium iodide / boric acid / water of 2.5 / 4 / 100 (first crosslinking step). Subsequently, the film removed from the aqueous solution was immersed for 11 seconds in an aqueous solution at 45°C with a mass ratio of potassium iodide / boric acid / zinc chloride / water of 3 / 5.5 / 0.6 / 100 (second crosslinking step, metal ion treatment step). Subsequently, the film extracted from the aqueous solution was immersed in a washing solution (washing step), and the film extracted from the washing solution was dried at 38°C (drying step) to obtain a polarizer with a thickness of 12 μm in which iodine was adsorbed and oriented on polyvinyl alcohol. Stretching was mainly carried out in the dyeing step and the first crosslinking step, and the total stretching ratio was 5.85 times. The thickness of the obtained polarizer was measured using a Nikon Corporation digital micrometer "MH-15M".

[0345] (Manufacturing Example 2: Preparation of Adhesive Composition) 50 g of acetoacetyl-modified polyvinyl alcohol resin (GoseNex® Z-410, manufactured by Mitsubishi Chemical Corporation) was dissolved in 950 g of pure water, heated at 90°C for 2 hours, and then cooled to room temperature to obtain an acetoacetyl-modified polyvinyl alcohol resin solution. To the obtained acetoacetyl-modified polyvinyl alcohol resin solution, 0.33 parts by mass of maleic acid, 10 parts by mass of glyoxal, and 20 parts by mass of urea were added per 100 parts by mass of the acetoacetyl-modified polyvinyl alcohol resin to obtain an adhesive composition.

[0346] (Manufacturing Example 3: Preparation of Composition B-1 for Ammonia Block Layer Formation) Composition B-1 for forming an ammonia block layer is obtained by mixing 77.0 parts by mass of glycerin triacrylate (Aronix® M-930, manufactured by Toagosei Co., Ltd., hydroxyl value: 30 mg KOH / g), 20.0 parts by mass of glycidyl methacrylate (manufactured by Mitsubishi Gas Chemical Company, Inc.), 3.0 parts by mass of a photopolymerization initiator (Irgacure 907, manufactured by BASF), and 200.0 parts by mass of methyl ethyl ketone.

[0347] (Manufacturing Example 4: Preparation of Composition B-2 for Ammonia Block Layer Formation) (i) Preparation of polymers having epoxy groups Glycidyl methacrylate is dissolved in methyl ethyl ketone (MEK), and the reaction is carried out at 80°C for 2 hours while adding a thermal polymerization initiator dropwise. Then, the reaction solution is added dropwise to hexane, and the precipitate is dried under reduced pressure to obtain polyglycidyl methacrylate (weight-average molecular weight 12000 on a polystyrene basis, epoxy equivalent 170 g / eq). The obtained polyglycidyl methacrylate is dissolved in methyl ethyl ketone to a solid content concentration of 50% by mass to obtain a polymer solution. (ii) Preparation of composition B-2 for forming an ammonia block layer Composition B-2 for forming an ammonia block layer is obtained by mixing 77.0 parts by mass of glycerin triacrylate (Aronix (registered trademark M-930) manufactured by Toagosei Co., Ltd.), the above polymer solution in an amount having a solid content of 20.0 parts by mass, 3.0 parts by mass of a photopolymerization initiator (Irgacure 907 manufactured by BASF), and 190.0 parts by mass of methyl ethyl ketone.

[0348] (Manufacturing Example 5: Preparation of Composition B-3 for Forming an Ammonia Block Layer) Composition B-3 for forming an ammonia block layer is obtained by mixing 77.0 parts by mass of glycerin triacrylate (Aronix® M-930, manufactured by Toagosei Co., Ltd., hydroxyl value: 30 mg KOH / g), 20.0 parts by mass of hydrogenated acrylic acid modified rosin (Pine Crystal KE-604, manufactured by Arakawa Chemical Industries, Ltd., acid value: 240 mg KOH / g, mass-average molecular weight: 360), 3.0 parts by mass of photopolymerization initiator (Irgacure 907, manufactured by BASF), 100.0 parts by mass of methyl ethyl ketone, and 100.0 parts by mass of methyl acetate.

[0349] (Manufacturing Example 6: Preparation of the first protective film F1) The first protective film F1 is a triacetylcellulose film with a hard coat layer (manufactured by Toppan Printing Co., Ltd., product name "40FJCHCN-LMP", triacetylcellulose film thickness: 40 μm, hard coat layer thickness: 7 μm, moisture permeability: 200 g / m²). 2 Prepare the saponified product (F1) by saponifying the side opposite the hard coat layer of the first protective film F1.

[0350] (Manufacturing Example 7: Fabrication of the first protective film FB1 with an ammonia blocking layer) Composition B-1 for forming an ammonia block layer is applied to the side of the protective film F1 (unsaponified) prepared in Manufacturing Example 6 that is opposite to the hard coat layer, and dried at 60°C for 150 seconds to form a coating layer. Subsequently, under nitrogen purging and an oxygen concentration of approximately 0.1%, an illuminance of 400 mW / cm is applied using an air-cooled metal halide lamp (manufactured by I-Graphic Co., Ltd.) with an output of 160 W / cm. 2, irradiation amount 120mJ / cm 2 The coating layer is cured by irradiation with ultraviolet light to obtain a first protective film FB1 with an ammonia blocking layer. The coating thickness of the coating layer is adjusted so that the film thickness of the ammonia blocking layer is 1 μm.

[0351] (Manufacturing Example 8: Fabrication of the first protective film FB2 with ammonia blocking layer) Composition B-2 for forming an ammonia block layer is applied to the side of the protective film F1 (unsaponified) prepared in Manufacturing Example 6 that is opposite to the hard coat layer, and dried at 60°C for 150 seconds to form a coating layer. Subsequently, under nitrogen purging and an oxygen concentration of approximately 0.1%, an illuminance of 400 mW / cm is applied using an air-cooled metal halide lamp (manufactured by I-Graphic Co., Ltd.) with an output of 160 W / cm. 2 , irradiation amount 120mJ / cm 2 The coating layer is cured by irradiation with ultraviolet light to obtain a first protective film FB2 with an ammonia blocking layer. The coating thickness of the coating layer is adjusted so that the thickness of the ammonia blocking layer is 1 μm.

[0352] (Manufacturing Example 9: Fabrication of the first protective film FB3 with ammonia blocking layer) Composition B-3 for forming an ammonia block layer is applied to the side of the protective film F1 (unsaponified) prepared in Manufacturing Example 6 that is opposite to the hard coat layer, and dried at 60°C for 150 seconds to form a coating layer. Subsequently, under nitrogen purging and an oxygen concentration of approximately 0.1%, an illuminance of 400 mW / cm is applied using an air-cooled metal halide lamp (manufactured by I-Graphic Co., Ltd.) with an output of 160 W / cm. 2 , irradiation amount 120mJ / cm 2 The coating layer is cured by irradiation with ultraviolet light to obtain the first protective film FB3 with an ammonia blocking layer. The coating thickness of the coating layer is adjusted so that the thickness of the ammonia blocking layer is 1 μm.

[0353] (Manufacturing Example 10: Preparation of the second protective film R1) As the second protective film R1, a phase difference film (a laminate of a liquid crystal layer (first phase difference layer) and a cycloolefin polymer film (second phase difference layer)) described in

[0147] of International Publication No. 2022 / 158482 is prepared.

[0354] (Manufacturing Example 11: Fabrication of a second protective film RB1 with an ammonia blocking layer) Composition B-1 for forming an ammonia block layer was applied to the first phase difference layer side of the second protective film R2 prepared in manufacturing example 10, and dried at 60°C for 150 seconds to form a coating layer. Subsequently, under nitrogen purging and an oxygen concentration of approximately 0.1%, an illuminance of 400 mW / cm was applied using an air-cooled metal halide lamp (manufactured by iGraphic Co., Ltd.) with an output of 160 W / cm. 2 , irradiation amount 120mJ / cm 2 The coating layer is cured by irradiation with ultraviolet light to obtain a second protective film RB1 with an ammonia block layer. The coating thickness of the coating layer is adjusted so that the thickness of the block layer is 1 μm.

[0355] (Example 1-1: Manufacturing of polarizing plate 1-1) A first protective film FB1 with an ammonia block layer, prepared in Production Example 7, is laminated onto one side of the polarizer prepared in Production Example 1 via the adhesive composition prepared in Production Example 2, and a second protective film R1, prepared in Production Example 10, is laminated onto the other side via the adhesive composition prepared in Production Example 2. Lamination is performed using a roll laminating machine. Film FB1 is corona-treated immediately before lamination so that the side with the ammonia block layer faces the polarizer (in principle, corona treatment is performed immediately before laminating the side with the ammonia block layer with the adhesive composition, but this may be omitted in some cases). Film R1 is laminated so that the first phase difference layer faces the polarizer and the slow axis of the second phase difference layer is parallel to the absorption axis of the polarizer. The amount of adhesive composition applied is adjusted so that the thickness of the laminated layer formed after drying is 80 nm. After lamination using the roll laminating machine, it is dried at 75°C for 8 minutes to obtain polarizing plate 1-1. Polarizing plate 1-1 can be described as a polarizing plate having a layer structure (S1).

[0356] (Example 1-2: Manufacturing of polarizing plate 1-2) Polarizing plate 1-2 is obtained in the same manner as in Example 1-1, except that the first protective film FB2 with an ammonia block layer, which was prepared in Manufacturing Example 8, is used instead of film FB1. Polarizing plate 1-2 can be said to be a polarizing plate having a layer structure (S1).

[0357] (Examples 1-3: Manufacturing of polarizing plates 1-3) Polarizing plate 1-3 is obtained in the same manner as in Example 1-1, except that the first protective film FB3 with an ammonia block layer, which was prepared in Manufacturing Example 9, is used instead of film FB1. Polarizing plate 1-3 can be said to be a polarizing plate having a layer structure (S1).

[0358] (Comparative Example 1: Manufacturing of Polarizing Plate X-1) Polarizing plate X-1 is obtained in the same manner as in Example 1-1, except that the first protective film F1 (saponified product) prepared in Manufacturing Example 6 is used instead of film FB1. Polarizing plate X-1 can be said to be a polarizing plate having the following layer configuration (X1). (X1) Base material 1 / Lamination layer / Polarizer / Lamination layer / Base material 2

[0359] (Example 2-1: Manufacturing of polarizing plate 2-1) A second protective film R1, prepared in Production Example 10, is laminated onto one surface of the polarizer fabricated in Production Example 1 via the adhesive composition prepared in Production Example 2. Lamination is performed using a roll laminating machine. The amount of adhesive composition applied is adjusted so that the thickness of the laminated layer formed after drying is 80 nm. After lamination using the roll laminating machine, the laminate (1) is dried at 75°C for 8 minutes. Next, the ammonia block layer forming composition B-1 prepared in Manufacturing Example 3 is applied to the polarizer side of the laminate (1), and the coating layer is formed by drying at 60°C for 150 seconds. Then, under nitrogen purging and an oxygen concentration of approximately 0.1%, an illuminance of 400 mW / cm is applied using an air-cooled metal halide lamp (manufactured by I-Graphic Co., Ltd.) with an output of 160 W / cm. 2 , irradiation amount 120mJ / cm 2The coated layer is cured by irradiation with ultraviolet light to form an ammonia block layer and obtain a laminate (2). The coating thickness of the coated layer is adjusted so that the film thickness of the ammonia block layer is 1 μm. Next, the first protective film F1 prepared in Production Example 6 is laminated onto the ammonia block layer of the laminate (2) via the adhesive composition prepared in Production Example 2. Lamination is performed using a roll laminating machine. The amount of adhesive composition applied is adjusted so that the thickness of the laminated layer formed after drying is 80 nm. After lamination using the roll laminating machine, it is dried at 75°C for 8 minutes to obtain polarizer 2-1. Polarizer 2-1 can be said to be a polarizing plate having a layer structure (S2).

[0360] (Example 3-1: Manufacturing of polarizing plate 3-1) On one side of the polarizer fabricated in Manufacturing Example 1, the uncoated side of the first protective film F1 (saponified product) prepared in Manufacturing Example 6 is laminated via the adhesive composition prepared in Manufacturing Example 2. On the other side, the second protective film RB1 with an ammonia block layer prepared in Manufacturing Example 11 is laminated via the adhesive composition prepared in Manufacturing Example 2. Lamination is performed using a roll laminating machine. Film RB1 is corona treated immediately before lamination so that the side with the ammonia block layer faces the polarizer. Film RB1 is laminated so that the slow axis of the second phase difference layer is parallel to the absorption axis of the polarizer. The amount of adhesive composition applied is adjusted so that the thickness of the laminated layer formed after drying is 80 nm. After lamination using the roll laminating machine, it is dried at 75°C for 8 minutes to obtain polarizing plate 3-1. Polarizing plate 3-1 can be said to be a polarizing plate having a layer structure (S4).

[0361] The polarizing plates of the obtained examples and comparative examples were subjected to ammonia gas exposure tests using the following method. The results are shown in Table 1.

[0362] <Ammonia gas exposure test> (1) Fabrication of polarizing plates with adhesive layer An adhesive sheet is prepared by laminating a PET film with a release agent on both sides of a commercially available sheet-type acrylic adhesive layer. The thickness of the adhesive layer is 25 μm, and the storage modulus is 0.06 MPa. One side of the PET film of the adhesive sheet is peeled off to expose the adhesive layer, and this is bonded to the second protective film surface of a polarizing plate to obtain a polarizing plate with an adhesive layer.

[0363] (2) Preparation of evaluation laminates A polarizing plate with an adhesive layer is cut to a size of 40 mm x 35 mm so that the absorption axis and the longer side are parallel. Next, the PET film on the adhesive layer is peeled off to expose the adhesive layer, and a 50 mm x 40 mm alkali-free glass (Corning's "EAGLE XG") is bonded onto the adhesive layer to obtain an evaluation laminate.

[0364] (3) Ammonia gas exposure test The orthogonal transmittance at a wavelength of 700 nm was measured for the obtained evaluation laminate using a spectrophotometer with an integrating sphere (JASCO Corporation, V-7100). The orthogonal transmittance was 0.01% or less in all cases.

[0365] Next, the evaluation laminate and 0.07 ml of 10% ammonia aqueous solution are placed in a 500 ml sealed plastic bottle and left to stand at 60°C for 120 hours. The evaluation laminate is removed, and the orthogonal transmittance is measured using a spectrophotometer with an integrating sphere (JASCO Corporation, V-7100). The ammonia concentration in the sealed plastic bottle in this test is 20,000 ppm.

[0366] [Table 1]

[0367] As shown in Table 1, in the example, the increase in orthogonal transmittance at a wavelength of 700 nm after exposure of the evaluation laminate to ammonia gas is suppressed compared to Comparative Example 1.

[0368] (Example 4-1: Manufacturing of polarizing plate 4-1) As the adhesive layer, a commercially available sheet-type acrylic adhesive layer (thickness: 5 μm, storage modulus: 0.14 MPa) with a release agent attached to both sides of a 38 μm PET sheet is prepared. The adhesive layer is laminated onto the ammonia block layer of the first protective film FB1 with an ammonia block layer, which was prepared in Manufacturing Example 7, to obtain a laminate (4-1-1). Next, a laminate (4-1-1) is laminated onto the first protective film F1 of the polarizing plate X-1 prepared in Comparative Example 1 to obtain polarizing plate 4-1. Polarizing plate 4-1 can be said to be a polarizing plate having the following layer configuration (S1'). (S1') Base material 3 / AB layer / Lamination layer / Base material 1 / Lamination layer / Polarizer / Lamination layer / Base material 2

[0369] (Comparative Example 2: Manufacturing of Polarizing Plate X-2) Polarizing plate X-2 is obtained in the same manner as in Example 4-1, except that the first protective film F1 (unsaponified) prepared in Manufacturing Example 6 is used instead of film FB1. Polarizing plate X-2 can be said to be a polarizing plate having the following layer configuration (X). (X2) Base material 3 / Lamination layer / Base material 1 / Lamination layer / Polarizer / Lamination layer / Base material 2

[0370] The polarizing plates obtained from the examples and comparative examples were subjected to an ammonia gas exposure test using the same method as described above. The results are shown in Table 2.

[0371] [Table 2]

[0372] As shown in Table 2, in Example 4-1, the increase in orthogonal transmittance at a wavelength of 700 nm after exposure of the evaluation laminate to ammonia gas is suppressed compared to Comparative Example 2.

[0373] (Example 5-1: Manufacturing of polarizing plate 5-1) A polarizing plate 5-1 is obtained in the same manner as in Example 2-1, except that the first protective film FB1 with an ammonia block layer, which was prepared in Manufacturing Example 7, is used instead of film F1. Polarizing plate 5-1 can be said to be a polarizing plate having a layer structure (S6).

[0374] (Example 6-1: Manufacturing of polarizing plate 6-1) The block layer surface of the first protective film FB1 with an ammonia block layer, prepared in Production Example 7, is laminated onto one surface of the polarizer prepared in Production Example 1 via the adhesive composition prepared in Production Example 2. Lamination is performed using a roll laminating machine. The amount of adhesive composition prepared in Production Example 2 applied is adjusted so that the thickness after drying is 80 nm. After lamination, the laminate is dried at 75°C for 8 minutes to obtain the laminate. Next, the block layer-forming composition B-1 prepared in Manufacturing Example 3 is applied to the polarizer side of the laminate prepared above, and the coated layer is formed by drying at 60°C for 150 seconds. After that, under nitrogen purging and an oxygen concentration of approximately 0.1%, an illuminance of 400 mW / cm is applied using an air-cooled metal halide lamp (manufactured by I-Graphic Co., Ltd.) with an output of 160 W / cm. 2 , irradiation amount 120mJ / cm 2 The coated layer is cured by irradiation with ultraviolet light to form a block layer and obtain a laminate (6-1-1). The coating thickness of the coated layer is adjusted so that the film thickness of the block layer is 1 μm. Next, the second protective film R1 prepared in Production Example 10 is laminated onto one side of the laminate (6-1-1) via the adhesive composition prepared in Production Example 2. Lamination is performed using a roll laminating machine. The film F1 is laminated so that the side opposite the hard coat layer faces the polarizer. The film R1 is laminated so that the first phase difference layer faces the polarizer, and the slow axis of the second phase difference layer is parallel to the absorption axis of the polarizer. The amount of adhesive composition applied is adjusted so that the thickness of the laminated layer formed after drying is 80 nm. After lamination using the roll laminating machine, it is dried at 75°C for 8 minutes to obtain polarizing plate 6-1. Polarizing plate 6-1 can be said to be a polarizing plate having a layer structure (S7).

[0375] (Example 7-1: Manufacturing of polarizing plate 7-1) The first protective film F1 (saponified product) prepared in Production Example 6 is laminated onto one side of the polarizer fabricated in Production Example 1 via the adhesive composition prepared in Production Example 2. Lamination is performed using a roll laminating machine. The amount of adhesive composition applied is adjusted so that the thickness of the laminated layer formed after drying is 80 nm. After lamination using the roll laminating machine, the laminate (7-1-1) is obtained by drying at 75°C for 8 minutes. Next, the ammonia block layer forming composition B-1 prepared in Manufacturing Example 3 is applied to the polarizer side of the laminate (7-1-1), and the coating layer is formed by drying at 60°C for 150 seconds. Subsequently, under nitrogen purging and an oxygen concentration of approximately 0.1%, an illuminance of 400 mW / cm is applied using an air-cooled metal halide lamp (manufactured by I-Graphic Co., Ltd.) with an output of 160 W / cm. 2 , irradiation amount 120mJ / cm 2 The coated layer is cured by irradiation with ultraviolet light to form an ammonia block layer, and a laminate (7-1-2) is obtained. The coating thickness of the coated layer is adjusted so that the film thickness of the ammonia block layer is 1 μm. Next, the second protective film RB1, prepared in Production Example 11, is laminated onto the ammonia block layer of the laminate (7-1-2) via the adhesive composition prepared in Production Example 2. Lamination is performed using a roll laminating machine. The amount of adhesive composition applied is adjusted so that the thickness of the laminated layer formed after drying is 80 nm. After lamination using the roll laminating machine, it is dried at 75°C for 8 minutes to obtain polarizing plate 7-1. Polarizing plate 7-1 can be said to be a polarizing plate having a layer structure (S11).

[0376] The polarizing plates obtained in the examples were subjected to an ammonia gas exposure test using the same method as described above. The results are shown in Table 3.

[0377] [Table 3]

[0378] As shown in Table 3, in Examples 5-1 to 7-1, the increase in orthogonal transmittance at a wavelength of 700 nm after exposure of the evaluation laminate to ammonia gas is suppressed compared to Comparative Example 1.

[0379] (Example 8-1: Manufacturing of polarizing plate 8-1) A polarizing plate 8-1 is obtained by laminating the laminate (4-1-1) prepared in Example 4-1 onto the first protective film of the polarizing plate 2-1 prepared in Example 2-1. Polarizing plate 8-1 can be said to be a polarizing plate having a layer structure (S24).

[0380] (Example 9-1: Manufacturing of polarizing plate 9-1) A second protective film RB1 with an ammonia block layer, prepared in Production Example 11, is laminated onto the ammonia block layer of the laminate (7-1-2) prepared in Example 7-1 via the adhesive composition prepared in Production Example 2 to obtain a laminate (9-1-1). Next, the laminate (4-1-1) prepared in Example 4-1 is laminated onto the first protective film of the laminate (9-1-1) to obtain polarizing plate 9-1. Polarizing plate 9-1 can be said to be a polarizing plate having a layer structure (S25).

[0381] (Example 10-1: Manufacturing of polarizing plate 10-1) A polarizing plate 10-1 is obtained by laminating the laminate (4-1-1) prepared in Example 4-1 onto the first protective film of the polarizing plate 1-1 prepared in Example 1-1. Polarizing plate 10-1 can be said to be a polarizing plate having a layer structure (S23).

[0382] The polarizing plates obtained in the examples were subjected to an ammonia gas exposure test using the same method as described above. The results are shown in Table 4.

[0383] [Table 4]

[0384] As shown in Table 4, in Examples 8-1 to 10-1, the increase in orthogonal transmittance at a wavelength of 700 nm after exposure of the evaluation laminate to ammonia gas is suppressed compared to Comparative Example 1. [Explanation of symbols]

[0385] 10, 20, 30, 40, 50, 60, 110…Polarizing plate, 11, 21, 31, 41, 51, 61…Polarizer, 12, 22, 32, 42, 52, 62…First base film, 13, 23, 33, 43, 53, 63…Second base film, 14, 24, 34, 44, 54, 64…First lamination layer, 15, 25, 35, 45, 55, 65…Second lamination layer, 16, 26, 36, 46, 47, 56, 57, 66, 67…Ammonia block layer, 120…Image display panel, 130…Transparent component, 140…Third lamination layer, 150…Fourth lamination layer, 100…Image display device.

Claims

1. Polarizer and, Ammonia block layer, Equipped with, A polarizing plate in which the ammonia block layer contains a compound (1) having an epoxy group or a carboxyl group.

2. The polarizing plate according to claim 1, further comprising a first base film laminated on one side of the polarizer and a second base film laminated on the other side of the polarizer.

3. The polarizing plate according to claim 2, wherein the ammonia block layer is laminated between the first base film and the polarizer, or between the second base film and the polarizer.

4. The polarizing plate according to claim 1, wherein the polarizer includes a polyvinyl alcohol-based resin layer on which iodine is adsorbed and oriented.

5. The polarizing plate according to claim 1, wherein the compound (1) is a polymer having an epoxy group, or a rosin compound having an acid value of 100 mg KOH / to 500 mg KOH / .

6. The ammonia block layer comprises a first polymer having monomer units (A) derived from an acrylic monomer (a) having a (meth)acryloyl group, The polarizing plate according to claim 5, wherein at least a portion of the monomer unit (A) is a monomer unit (A') derived from a monomer (a') having an epoxy group.

7. The polarizing plate according to claim 6, wherein the ratio of monomer unit (A') to monomer unit (A) is 12% by mass or more and 50% by mass or less.

8. The polarizing plate according to claim 5, wherein the ammonia block layer comprises a first polymer having monomer units (A) derived from an acrylic monomer (a) having a (meth)acryloyl group, and a second polymer having an epoxy group.

9. The polarizing plate according to claim 8, wherein the content of the second polymer is 12 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the first polymer.

10. The polarizing plate according to claim 5, wherein the ammonia block layer comprises a first polymer having monomer units (A) derived from an acrylic monomer (a) having a (meth)acryloyl group, and a rosin compound having an acid value of 100 mg KOH / g or more and 500 mg KOH / g or less.

11. The polarizing plate according to claim 10, wherein the content of the rosin compound is 15 parts by mass or more and 100 parts by mass or less with respect to 100 parts by mass of the first polymer.

12. The polarizing plate according to any one of claims 6 to 11, wherein at least a portion of the monomer unit (A) is a monomer unit (A-1) derived from a polyfunctional monomer (a-1) having two or more (meth)acryloyl groups.

13. The ammonia block layer is a coating film of a coating solution containing a monomer component and a radical polymerization initiator. The monomer component contains an acrylic monomer (a) having a (meth)acryloyl group, The polarizing plate according to claim 5, wherein at least a portion of the acrylic monomer (a) is a monomer (a') having an epoxy group.

14. The polarizing plate according to claim 13, wherein the proportion of monomer (a') in the acrylic monomer (a) is 12% by mass or more and 50% by mass or less.

15. The ammonia block layer is a coating film of a coating solution containing a monomer component, a radical polymerization initiator, and a polymer having an epoxy group. The polarizing plate according to claim 5, wherein the monomer component contains an acrylic monomer (a) having a (meth)acryloyl group.

16. The polarizing plate according to claim 15, wherein the content of the polymer having the epoxy group is 12 parts by mass or more and 100 parts by mass or less per 100 parts by mass of the monomer component.

17. The ammonia blocking layer is a coating film of a coating solution containing a monomer component, a radical polymerization initiator, and a rosin compound having an acid value of 100 mg KOH / g or more and 500 mg KOH / g or less. The polarizing plate according to claim 5, wherein the monomer component contains an acrylic monomer (a) having a (meth)acryloyl group.

18. The polarizing plate according to claim 17, wherein the content of the rosin compound is 12 parts by mass or more and 100 parts by mass or less per 100 parts by mass of the monomer component.

19. The polarizing plate according to any one of claims 13 to 18, wherein at least a portion of the acrylic monomer (a) is a polyfunctional monomer (a-1) having two or more (meth)acryloyl groups.

20. An image display device comprising a polarizing plate according to claim 1 and an image display panel.

Images