Optical laminate and image display device

Abstract

To provide a novel optical laminate capable of suppressing color loss at edges of a polarizer under high temperature and high humidity.SOLUTION: An optical laminate provided herein comprises a polarizer, a selective light absorbing adhesive layer, and an intermediate layer laminated between the polarizer and the selective light absorbing adhesive layer in contact therewith. The intermediate layer comprises just one or more layers selected from a group consisting of a liquid crystal cured layer, alignment layer, and adhesive layer. The polarizer has iodine absorbed and aligned therein and contains 5.0 mass% or less boron. An adhesive composition forming the selective light absorbing adhesive layer contains a selective light absorbing polymer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an optical laminate and an image display device. [Background technology]

[0002] Polarizing plates, which are made by laminating a protective film on one or both sides of a polarizer, are optical components that are widely used in image display devices such as liquid crystal displays (LCDs) and organic electroluminescence (OLED) displays, including mobile televisions, and in recent years, various mobile devices such as mobile phones, smartphones, and tablet terminals. Polarizing plates are often used by being attached to image display elements (liquid crystal cells, organic EL display elements, etc.) via a pressure-sensitive adhesive layer (for example, JP 2010-229321 A (Patent Document 1)). For this reason, polarizing plates are sometimes distributed on the market in the form of pressure-sensitive adhesive layer-attached polarizing plates, in which a pressure-sensitive adhesive layer is previously provided on one surface of the polarizing plate.

[0003] Furthermore, mobile devices are often used in harsh environments of high temperature and humidity, and polarizers are therefore required to have high durability. JP 2013-105036 A (Patent Document 2) describes that by increasing the boric acid content in a polarizer and generating a large amount of boric acid crosslinking, the I3 complex is highly oriented and highly stable, thereby suppressing the occurrence of blue leak and providing a polarizer with excellent low-temperature, high-humidity durability. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-229321 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-105036 Summary of the Invention [Problem to be solved by the invention]

[0005] Polarizing plates have a problem in that discoloration is likely to occur at the edges of the polarizer under high-temperature and high-humidity environments. This problem is particularly pronounced in configurations in which a protective film is laminated to only one side of the polarizer. Although a method for suppressing discoloration of polarizers by increasing the boron content in the polarizer is known, this method has the problem of making the polarizer prone to shrinkage due to heating.

[0006] An object of the present invention is to provide a novel optical laminate in which color loss at the edges of a polarizer under high temperature and high humidity conditions is suppressed. [Means for solving the problem]

[0007] The present invention provides the optical laminates exemplified below and image displays using the same. [1] An optical laminate comprising a polarizer, a light-selective absorbing pressure-sensitive adhesive layer, and an intermediate layer laminated between the polarizer and the light-selective absorbing pressure-sensitive adhesive layer in contact with them, the intermediate layer has only one or more layers selected from the group consisting of a liquid crystal curing layer, an alignment layer, and an attachment layer; the polarizer has iodine adsorbed and aligned, and a boron content of 5.0 mass% or less; An optical laminate, wherein the pressure-sensitive adhesive composition forming the photoselective absorbing pressure-sensitive adhesive layer contains a photoselective absorbing polymer. [2] The optical laminate according to [1], further comprising a protective film laminated on the side of the polarizer opposite to the intermediate layer side. [3] The photoselective absorption polymer is represented by the following chemical formula (1): >NC=CC=C< (1) [However, one N atom and all four C atoms constituting the chemical formula (1) do not constitute a part or the whole of an aromatic heterocycle.] The optical laminate according to [1] or [2], which is a resin containing a structural unit having a structure represented by the following formula: and having a glass transition temperature of 40° C. or lower. [4] The optical laminate according to [3], wherein the content of the structural unit having the structure represented by the chemical formula (1) is 0.01 parts by mass or more and 50 parts by mass or less relative to 100 parts by mass of all structural units in the photoselective absorbing polymer. [5] The optical layered body according to any one of [1] to [4], wherein the photoselective absorbing polymer has a weight average molecular weight of 300,000 or more. [6] The optical laminate according to any one of [1] to [5], wherein the pressure-sensitive adhesive composition does not contain a light-selective absorber, or the content of the light-selective absorber is 0.5 parts by mass or less per 100 parts by mass of the total resin components. [7] The optical laminate according to any one of [1] to [6], wherein the intermediate layer has a λ / 4 retardation layer that is the liquid crystal cured layer. [8] The optical laminate according to any one of [1] to [7], which is an anti-reflection polarizing plate. [9] An image display device comprising an image display panel and the optical laminate according to [8] arranged in front of the image display panel.

[10] The image display device according to [9], which is an organic EL display device. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an optical laminate in which color loss at the edges of a polarizer is suppressed under a high-temperature and high-humidity environment, and an image display device including the same. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic cross-sectional view showing an example of an optical laminate of the present invention. [Figure 2] 1 is a schematic cross-sectional view showing an example of an optical laminate of the present invention. [Figure 3] 1 is a schematic cross-sectional view showing an example of an optical laminate of the present invention. [Figure 4] FIG. 10 is a diagram showing an example of an image observed with an optical microscope. [Figure 5] FIG. 10 is a diagram showing an example of data obtained by converting an observed image into 256 grayscale levels. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all of the drawings, the scales of the components are appropriately adjusted to make them easier to understand, and the scales of the components shown in the drawings do not necessarily match the scales of the actual components.

[0011] <Optical laminate> The optical laminate of the present invention includes a polarizer, a light-selectively absorbing pressure-sensitive adhesive layer, and an intermediate layer laminated between the polarizer and the light-selectively absorbing pressure-sensitive adhesive layer in contact with them. An example of the layer structure of the optical laminate of the present invention is shown in Figures 1, 2, and 3. Fig. 1 is a schematic cross-sectional view of an example of the optical laminate of the present invention. The optical laminate 100 shown in Fig. 1 has, in this order, a protective film 11, a polarizer 10, an intermediate layer 300, and a light-selective absorbing pressure-sensitive adhesive layer (hereinafter also referred to as "first pressure-sensitive adhesive layer") 20. The intermediate layer 300 has only one or more layers selected from the group consisting of a liquid crystal cured layer, an alignment layer, and an attachment layer.

[0012] Fig. 2 is a schematic cross-sectional view of an example of the optical laminate of the present invention. The optical laminate 101 shown in Fig. 2 has, in this order, a protective film 11, a polarizer 10, an intermediate layer 300, and a light-selective absorbing pressure-sensitive adhesive layer 20. The intermediate layer 300 has, in order from the polarizer 10 side, a second pressure-sensitive adhesive layer 32 and a first It has a liquid crystal cured layer 30, an adhesive layer 33, and a second liquid crystal cured layer 31.

[0013] Fig. 3 is a schematic cross-sectional view of an example of the optical laminate of the present invention. The optical laminate 102 shown in Fig. 3 has, in this order, a protective film 11, a polarizer 10, an intermediate layer 300, and a light-selective absorbing pressure-sensitive adhesive layer 20. The intermediate layer 300 is made of a second pressure-sensitive adhesive layer 32.

[0014] The thickness of the optical laminates 100, 101, and 102 is not particularly limited as it varies depending on the function required of the optical laminate and the use of the optical laminate, but is, for example, 5 μm or more and 200 μm or less, or 10 μm or more and 150 μm or less, or 120 μm or less.

[0015] The photoselectively absorbing pressure-sensitive adhesive layer contains a photoselectively absorbing polymer. The optical laminate of the present invention has photoselective absorption performance as a whole, since at least the photoselectively absorbing pressure-sensitive adhesive layer has photoselective absorption performance. Photoselective absorption performance refers to the property of easily absorbing light of a specific wavelength, and has at least one absorption maximum in the ultraviolet wavelength region to the visible light region. For example, when the photoselectively absorbing pressure-sensitive adhesive layer has ultraviolet absorption ability, the optical laminate disposed on an image display element has the function of protecting the image display element from ultraviolet light.

[0016] The optical laminate of the present invention may be configured to include a layer having light-selective absorption performance in addition to the light-selective absorbing pressure-sensitive adhesive layer. Examples of such other layers include a protective film 11 and an intermediate layer 300. In the present invention, the light-selective absorbing pressure-sensitive adhesive layer has light-selective absorption performance and contributes to the development of light-selective absorption performance in the entire optical laminate, thereby improving the degree of freedom in designing the light-selective absorption performance of the other layers. For example, the protective film 11 may need to be designed to be thicker in order to improve its light-selective absorption performance, but the high degree of freedom in designing the light-selective absorption performance makes it easy to make the protective film 11 thinner. For example, from the viewpoint of suppressing color fading at the edge of the polarizer under high temperature and high humidity, the intermediate layer 300 is preferably configured to be substantially free of a light-selective absorbent, and even if it is contained, the content thereof is 0.5 g / m 2 When the intermediate layer 300 has a second pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer also preferably does not substantially contain a light-selective absorber, and even if it does contain a light-selective absorber, the content of the light-selective absorber is preferably 0.5 g / m or less. 2 It is preferable that:

[0017] The photoselective absorbing pressure-sensitive adhesive layer is configured so that the photoselective absorbing polymer has photoselective absorbing performance and contributes to the expression of the photoselective absorbing performance of the photoselective absorbing pressure-sensitive adhesive layer, and therefore the photoselective absorbing pressure-sensitive adhesive layer can be configured so as not to contain a photoselective absorbing agent or to have a reduced content of the photoselective absorbing agent, thereby making it possible to suppress discoloration at the ends of the polarizer under high temperature and high humidity conditions.

[0018] The present inventors have found that there is a correlation between the content of a photoselective absorber contained in a pressure-sensitive adhesive layer and the degree of color bleeding at the edge of a polarizer under high temperature and high humidity. Based on this finding, when a relatively low molecular weight photoselective absorber is used, the photoselective absorber in the pressure-sensitive adhesive layer is likely to migrate toward the polarizer under high temperature and high humidity, and this migration is thought to be one of the causes of color bleeding. After further intensive research, the present inventors have found that imparting photoselective absorption performance to a pressure-sensitive adhesive layer by incorporating a photoselective absorbing polymer, rather than by adding a photoselective absorber, can suppress color bleeding at the edge of a polarizer under high temperature and high humidity, thereby arriving at the present invention. It is thought that the photoselective absorbing polymer has a relatively large molecular weight, which suppresses migration to the polarizer and thereby suppresses color bleeding at the edge of the polarizer.

[0019] [Polarizer] A polarizer has the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linearly polarized light having a vibration plane perpendicular to its absorption axis (parallel to its transmission axis). The polarizer 10 in the polarizer 10 has iodine adsorbed and aligned, and the boron content is 5.0% by mass or less. A boron content of 5.0% by mass or less, preferably 4.5% by mass or less, can suppress shrinkage caused by heating. The boron content is preferably 0.5% by mass or more, more preferably 1% by mass or more. The lower the boron content of the polarizer 10, the more likely discoloration occurs at the edges of the polarizer under high temperature and high humidity. Boron in the polarizer 10 improves the crosslinking degree of the polarizer 10 and contributes to stably retaining iodine in the polarizer 10. Therefore, a decrease in the boron content is thought to make it difficult to stably retain iodine, resulting in discoloration. In the present invention, even if the boron content of the polarizer 10 is 5.0% by mass or less, discoloration under high temperature and high humidity can be suppressed.

[0020] Examples of the polarizer 10 include a stretched film or stretched layer adsorbed with a dichroic dye having absorption anisotropy, a cured product of a polymerizable liquid crystal compound, and a cured liquid crystal layer containing a dichroic dye. The dichroic dye is a dye having different absorbance in the long axis direction and the short axis direction of the molecule, and iodine is preferably used as the dye.

[0021] A polarizer, which is a stretched film having a dye having absorption anisotropy adsorbed thereon, can usually be produced through the steps of uniaxially stretching a polyvinyl alcohol-based resin film, dyeing the polyvinyl alcohol-based resin film with a dichroic dye such as iodine to adsorb the dichroic dye, treating the polyvinyl alcohol-based resin film having the adsorbed dichroic dye with an aqueous boric acid solution, and washing the film with water after the treatment with the aqueous boric acid solution.

[0022] The thickness of the polarizer is usually 30 μm or less, preferably 15 μm or less, more preferably 13 μm or less, even more preferably 10 μm or less, and particularly preferably 8 μm or less. The thickness of the polarizer is usually 2 μm or more, preferably 3 μm or more, and may be, for example, 5 μm or more.

[0023] Polyvinyl alcohol resins are obtained by saponifying polyvinyl acetate resins. Examples of polyvinyl acetate resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate with other monomers copolymerizable with it. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth)acrylamide compounds having an ammonium group.

[0024] The saponification degree of the polyvinyl alcohol resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and polyvinyl formal, polyvinyl acetal, etc. modified with aldehydes can also be used. The polymerization degree of the polyvinyl alcohol resin is usually 1,000 or more and 10,000 or less, preferably 1,500 or more and 5,000 or less.

[0025] A polarizer, which is a stretched layer having an absorption anisotropy dye adsorbed thereon, can typically be produced by the following steps: applying a coating solution containing the polyvinyl alcohol resin onto a substrate film; uniaxially stretching the resulting laminate film; dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminate film with a dichroic dye such as iodine to adsorb the dichroic dye to form a polarizer; treating the film with the adsorbed dichroic dye in a boric acid aqueous solution; and washing the film with water after the boric acid aqueous solution treatment. The substrate film used to form the polarizer may also be used as a protective film 11. If necessary, the substrate film may be peeled off from the polarizer. The material and thickness of the substrate film may be the same as those of the protective film 11 described below.

[0026] [Protection film] The protective film 11 can be a coating layer or film made of an optically transparent thermoplastic resin, such as a cyclic polyolefin resin; a cellulose acetate resin made of a resin such as triacetyl cellulose or diacetyl cellulose; a polyester resin made of a resin such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate; a polycarbonate resin; a (meth)acrylic resin; a polypropylene resin, or a mixture of one or more of these. The protective film 11 may contain a light-selective absorber, which will be described later. Note that the light-selective absorber contained in the protective film 11 is retained within the protective film 11 and is therefore unlikely to migrate to the polarizer.

[0027] A hard coat layer may be formed on the protective film 11. The hard coat layer may be formed on one side or both sides of the protective film 11. By providing a hard coat layer, the protective film 11 can be improved in hardness and scratch resistance. The hard coat layer may be a cured layer of, for example, an acrylic resin, a silicone resin, a polyester resin, a urethane resin, an amide resin, or an epoxy resin. The hard coat layer may contain an additive to improve strength. The additive is not limited, and examples include inorganic fine particles, organic fine particles, and mixtures thereof. The hard coat layer is, for example, a cured layer of an ultraviolet-curable resin. Examples of ultraviolet-curable resins include an acrylic resin, a silicone resin, a polyester resin, a urethane resin, an amide resin, and an epoxy resin.

[0028] The thickness of the protective film 11 is usually 1 μm or more and 100 μm or less, and from the standpoint of strength and handleability, etc., it is preferably 5 μm or more and 80 μm or less, more preferably 8 μm or more and 60 μm or less, and even more preferably 12 μm or more and 45 μm or less.

[0029] The resin film serving as the protective film 11 is attached to the polarizer 10 via, for example, an adhesive layer. Examples of the adhesive that forms the adhesive layer include a water-based adhesive, an active energy ray-curable adhesive, and a thermosetting adhesive, and it is preferable to use a water-based adhesive or an active energy ray-curable adhesive. The two opposing surfaces that are attached via the adhesive layer may be previously subjected to corona treatment, plasma treatment, flame treatment, or the like, or may have a primer layer or the like.

[0030] [Photoselective absorption adhesive layer] The photoselectively absorbing pressure-sensitive adhesive layer 20 can be formed by applying a diluted solution of a pressure-sensitive adhesive composition containing a photoselectively absorbing polymer dissolved or dispersed in an organic solvent onto a substrate and drying the diluted solution. A suitable substrate is a plastic film, and a specific example is a release film that has been subjected to a release treatment. An example of a release film is a film made of a resin such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, or polyarylate, with one side subjected to a release treatment such as silicone treatment.

[0031] The thickness of the photoselective absorbent pressure-sensitive adhesive layer is, for example, 0.1 μm or more and 150 μm or less. When laminated with an image display panel, the thickness of the photoselective absorbent pressure-sensitive adhesive layer is usually 8 μm or more and 60 μm or less, and from the viewpoint of thinning, it is preferably 30 μm or less, further 25 μm or less, and particularly preferably 20 μm or less. When laminated with another optical film, for example, a λ / 4 retardation layer, the thickness of the photoselective absorbent pressure-sensitive adhesive layer is usually 2 μm or more and 30 μm or less, preferably 25 μm or less, more preferably 20 μm or less, particularly preferably 18 μm or less, and preferably 3 μm or more, and may be, for example, 10 μm or more, but from the viewpoint of further thinning, it is preferably 10 μm or less, particularly preferably 7 μm or less.

[0032] The photoselective absorptive adhesive layer 20 has an absorbance of 0.1 or more and 1.6 or less at a wavelength of 410 nm. When the light-selective absorbent pressure-sensitive adhesive layer 20 has such absorbance, the optical laminate as a whole can exhibit the desired light-selective absorption performance, while making it easier to configure the optical laminate as a whole thin.

[0033] The photoselective absorptive pressure-sensitive adhesive layer usually has an absorbance of 5.0 or less at a wavelength of 390 nm, and may have an absorbance of 4.5 or less. The photoselective absorptive pressure-sensitive adhesive layer usually has an absorbance of 5.0 or less at a wavelength of 400 nm, and may have an absorbance of 4.5 or less. The photoselective absorptive pressure-sensitive adhesive layer has an absorbance at a wavelength of 420 nm of usually 1.00 or less, preferably 0.60 or less, more preferably 0.40 or less, and is 0.00 or more. The photoselective absorptive pressure-sensitive adhesive layer has an absorbance at a wavelength of 430 nm of usually less than 0.20, preferably 0.18 or less, more preferably 0.10 or less, particularly preferably 0.05 or less, and 0.00 or more. The photoselective absorbent pressure-sensitive adhesive layer has an absorbance at a wavelength of 440 nm of usually less than 0.10, preferably 0.05 or less and 0.00 or more. When the absorbance at each wavelength is within the above range, light in the ultraviolet region can be sufficiently absorbed while light in the visible region can be transmitted as is.

[0034] The photoselective absorptive pressure-sensitive adhesive layer is preferably a pressure-sensitive adhesive layer that satisfies the following formula (3), and more preferably a pressure-sensitive adhesive layer that satisfies formula (4). A(405)≧0.5 (3) [In formula (3), A(405) represents absorbance at a wavelength of 405 nm.] A(405) / A(440)≧5 (4) [In formula (4), A(405) represents the absorbance at a wavelength of 405 nm, and A(440) represents the absorbance at a wavelength of 440 nm.]

[0035] The larger the A(405) value, the higher the absorption at a wavelength of 405 nm. If the A(405) value is less than 0.5, the absorption at a wavelength of 405 nm is low, and components that are susceptible to degradation by light around 400 nm (e.g., display devices such as organic EL elements and liquid crystal retardation films) are likely to deteriorate. The A(405) value is preferably 0.6 or more, more preferably 0.8 or more, and particularly preferably 1.0 or more. There is no particular upper limit, but it is usually 10 or less.

[0036] The value of A(405) / A(440) represents the magnitude of absorption at a wavelength of 405 nm relative to the magnitude of absorption at a wavelength of 440 nm, and a larger value indicates a specific absorption in the wavelength region around 405 nm. The value of A(405) / A(440) is preferably 10 or more, more preferably 30 or more, even more preferably 75 or more, and particularly preferably 100 or more.

[0037] [Adhesive composition] (Photoselective absorbing polymer) The pressure-sensitive adhesive composition contains a photoselective absorbing polymer. The photoselective absorbing polymer is a polymer having photoselective absorbing properties. The photoselective absorbing polymer can preferably absorb light having a wavelength in the wavelength range of 360 nm to 420 nm. The photoselective absorbing polymer contains a photoselective absorbing structural unit having a moiety having photoselective absorbing properties. The photoselective absorbing structural unit preferably has a moiety having photoselective absorbing properties in a side chain. Examples of the moiety having photoselective absorbing properties include a benzophenone group, a benzotriazole group, and a structure represented by the following chemical formula (1).

[0038] The photoselective absorbing polymer is preferably represented by the following chemical formula (1): >NC=CC=C< (1) [However, one N atom and all four C atoms constituting the chemical formula (1) do not constitute a part or the whole of an aromatic heterocycle.] The resin (A) contains a structural unit having a structure represented by the following formula (hereinafter referred to as "merocyanine structure") as a light-selective absorbing structural unit, and has a glass transition temperature of 40°C or lower. The resin (A) may have a merocyanine structure in the main chain or in a side chain, and more preferably, the resin (A) contains a structural unit having a merocyanine structure in the side chain.

[0039] The glass transition temperature (Tg) of the resin (A) is 40°C or lower, preferably 20°C or lower, more preferably 10°C or lower, and even more preferably 0°C or lower. The glass transition temperature of the resin (A) is usually -80°C or higher, preferably -60°C or higher, more preferably -50°C or higher, even more preferably -45°C or higher, and particularly preferably -30°C or higher. A glass transition temperature of the resin (A) of 40°C or lower is advantageous in improving the adhesion of the photoselective absorbing pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition containing the resin (A) to the adherend. A glass transition temperature of the resin (A) of -80°C or higher is advantageous in improving the durability (visual appearance defects during high-temperature testing, such as cohesive failure) of the photoselective absorbing pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition containing the resin (A). The glass transition temperature can be measured using a differential scanning calorimeter (DSC).

[0040] The structural unit having a merocyanine structure in the side chain is not particularly limited, but is preferably a structural unit derived from a compound having a polymerizable group and a merocyanine structure.

[0041] The compound having a polymerizable group and a merocyanine structure preferably satisfies the following formula (1-a), and more preferably satisfies formula (2-a): ε(405)≧5 (1-a) [In formula (1-a), ε(405) represents the gram absorption coefficient of the compound having a polymerizable group and a merocyanine structure at a wavelength of 405 nm. The unit of the gram absorption coefficient is L / (g cm)] ε(405) / ε(440)≧20 (2-a) [In formula (2-a), ε(405) represents the gram absorption coefficient of the compound having a polymerizable group and a merocyanine structure at a wavelength of 405 nm, and ε(440) represents the gram absorption coefficient of the compound having a polymerizable group and a merocyanine structure at a wavelength of 440 nm.]

[0042] Compounds having a polymerizable group and a merocyanine structure preferably have an ε(405) value of 5 L / (g·cm) or more, more preferably 10 L / (g·cm) or more, even more preferably 20 L / (g·cm) or more, even more preferably 30 L / (g·cm) or more, and typically 500 L / (g·cm) or less. Compounds with a higher ε(405) value are more likely to absorb light with a wavelength of 405 nm and more likely to exhibit degradation suppression properties due to ultraviolet rays and short-wavelength visible light. The compound having a polymerizable group and a merocyanine structure preferably has a value of ε(405) / ε(440) of 20 or more, more preferably 40 or more, even more preferably 70 or more, and particularly preferably 80 or more. Resins containing compounds with a large value of ε(405) / ε(440) can absorb light in the vicinity of 405 nm without impairing the color expression of the display device, and can suppress photodegradation of display devices such as retardation films and organic EL elements.

[0043] Examples of structural units having a merocyanine structure in the side chain include structural units derived from compounds represented by formula (I). [ka] [In formula (I), R 1 , R 2 , R 3 , R 4 and R 5 each independently represents a hydrogen atom, an aliphatic hydrocarbon group having 1 to 25 carbon atoms which may have a substituent, an aromatic hydrocarbon group having 6 to 15 carbon atoms which may have a substituent, a heterocyclic group, or an ethylenically unsaturated group, and -CH2- contained in the aliphatic hydrocarbon group or the aromatic hydrocarbon group is -NR 1AIt may be substituted with -, -SO2-, -CO-, -O- or S-. R 6 and R 7 each independently represents a hydrogen atom, an alkyl group having 1 to 25 carbon atoms, an electron-withdrawing group, or an ethylenically unsaturated group. R 1A represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. R 1 and R 2 may be linked together to form a ring structure, R 2 and R 3 may be linked together to form a ring structure, R 2 and R 4 may be linked together to form a ring structure, R 3 and R 6 may be linked together to form a ring structure, R 5 and R 7 may be linked together to form a ring structure, R 6 and R 7 may be linked to each other to form a ring structure. However, R 1 ~R 7 one of which is an ethylenically unsaturated group]

[0044] R 1 ~R 5 Examples of the aliphatic hydrocarbon group having 1 to 25 carbon atoms represented by the formula (I) include a linear or branched alkyl group having 1 to 25 carbon atoms, such as a methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, tert-butyl group, sec-butyl group, n-pentyl group, isopentyl group, n-hexyl group, isohexyl group, n-octyl group, isooctyl group, n-nonyl group, isononyl group, n-decyl group, isodecyl group, n-dodecyl group, isododecyl group, undecyl group, lauryl group, myristyl group, cetyl group, or stearyl group; a cycloalkyl group having 3 to 25 carbon atoms, such as a cyclopropyl group, cyclobutyl group, cyclopentyl group, or cyclohexyl group; or a cycloalkylalkyl group having 4 to 25 carbon atoms, such as a cyclohexylmethyl group, with an alkyl group having 4 to 25 carbon atoms being preferred. R1 ~R 5 Examples of the substituent that the aliphatic hydrocarbon group having 1 to 25 carbon atoms represented by the following formula may have include a hydroxy group, a cyano group, a halogen atom, a mercapto group, an amino group, and a nitro group. Halogen atoms include fluorine atoms, chlorine atoms, bromine atoms and iodine atoms.

[0045] R 1 ~R 5 Examples of the aromatic hydrocarbon group having 6 to 15 carbon atoms represented by the formula (I) include aryl groups having 6 to 15 carbon atoms such as a phenyl group, a naphthyl group, an anthracenyl group, and a biphenyl group; and aralkyl groups having 7 to 15 carbon atoms such as a benzyl group, a phenylethyl group, a naphthylmethyl group, and a phenyl group. R 1 ~R 5 Examples of the substituent that the aromatic hydrocarbon group having 6 to 15 carbon atoms represented by the formula (I) may have include a hydroxy group, a cyano group, a halogen atom, a mercapto group, an amino group, a nitro group, an alkoxy group, an alkylthio group, an alkoxycarbonyl group, an acyl group, an acyloxy group, -C(NR 2A )R 2B , -CONR 3A R 3B , -SO2R 4A (R 2A , R 2B , R 3A and R 3B each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R 4A represents an alkyl group having 1 to 6 carbon atoms.)

[0046] Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the alkoxy group include alkoxy groups having 1 to 12 carbon atoms, such as a methoxy group, ethoxy group, propoxy group, butoxy group, pentyloxy group, hexyloxy group, octyloxy group, 2-ethylhexyloxy group, nonyloxy group, decyloxy group, undecyloxy group, and dodecyloxy group. Examples of the alkylthio group include alkylthio groups having 1 to 12 carbon atoms, such as a methylthio group, an ethylthio group, a propylthio group, and a butylthio group. Examples of the acyl group include acyl groups having 2 to 13 carbon atoms, such as an acetyl group, a propionyl group, and a butyryl group. Examples of the acyloxy group include acyloxy groups having 2 to 13 carbon atoms, such as a methylcarbonyloxy group, an ethylcarbonyloxy group, an n-propylcarbonyloxy group, an isopropylcarbonyloxy group, an n-butylcarbonyloxy group, a sec-butylcarbonyloxy group, a tert-butylcarbonyloxy group, a pentylcarbonyloxy group, a hexylcarbonyloxy group, an octylcarbonyloxy group, and a 2-ethylhexylcarbonyloxy group. Examples of the alkoxycarbonyl group include alkoxycarbonyl groups having 2 to 13 carbon atoms, such as a methoxycarbonyl group, an ethoxycarbonyl group, a propoxycarbonyl group, a butoxycarbonyl group, a pentyloxycarbonyl group, a hexyloxycarbonyl group, an octyloxycarbonyl group, a 2-ethylhexyloxycarbonyl group, a nonyloxycarbonyl group, a decyloxycarbonyl group, an undecyloxycarbonyl group, and a dodecyloxycarbonyl group. -CONR 3A R 3B Examples of the aminocarbonyl group include an aminocarbonyl group, a methylaminocarbonyl group, a dimethylaminocarbonyl group, an ethylaminocarbonyl group, and a methylmethylaminocarbonyl group. -C(NR 2A )R 2B Examples of the imino group include a methylimino group, a dimethylimino group, and a methylethylimino group. -SO2R 4A Examples of the sulfonyl group include a methylsulfonyl group and an ethylsulfonyl group.

[0047] R 1A and R 1B Examples of the alkyl group having 1 to 6 carbon atoms represented by the formula (I) include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a tert-butyl group, and a sec-butyl group.

[0048] R 1 ~R 5 Examples of the heterocyclic group represented by the formula (I) include aliphatic heterocyclic groups having 4 to 20 carbon atoms, such as a pyrrolidine ring group, a pyrroline ring group, an imidazolidine ring group, an imidazoline ring group, an oxazoline ring group, a thiazoline ring group, a piperidine ring group, a morpholine ring group, a piperazine ring group, an indole ring group, an isoindole ring group, a quinoline ring group, a thiophene ring group, a pyrrole ring group, a thiazoline ring group, and a furan ring group, or aromatic heterocyclic groups having 3 to 20 carbon atoms.

[0049] R 6 and R 7 Examples of the alkyl group having 1 to 25 carbon atoms represented by the formula (I) include linear or branched alkyl groups having 1 to 25 carbon atoms, such as a methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, tert-butyl group, sec-butyl group, n-pentyl group, isopentyl group, n-hexyl group, isohexyl group, n-octyl group, isooctyl group, n-nonyl group, isononyl group, n-decyl group, isodecyl group, n-dodecyl group, isododecyl group, undecyl group, lauryl group, myristyl group, cetyl group, and stearyl group.

[0050] R 6 and R 7 Examples of the electron-withdrawing group represented by the formula (I-1) include a cyano group, a nitro group, a halogen atom, an alkyl group substituted with a halogen atom, and a group represented by the formula (I-1). [ka] [In the formula, R 111 represents a hydrogen atom or a hydrocarbon group having 1 to 25 carbon atoms, and at least one methylene group contained in the alkyl group may be substituted with an oxygen atom. X 1 is -CO-* 1 , -COO-* 1 , -CS-* 1 ,-CSS-* 1 , -CSNR 112 -* 1 , -CONR113 -* 1 , -CNR 114 -* 1 or SO2-* 1 Represents. R 112 , R 113 and R 114 each independently represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a phenyl group. * 1 is R 111 Represents a bond with . * indicates a bond to a carbon atom.

[0051] Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the alkyl group substituted with a halogen atom include perfluoroalkyl groups such as a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluoroisopropyl group, a perfluorobutyl group, a perfluorosec-butyl group, a perfluorotert-butyl group, a perfluoropentyl group, and a perfluorohexyl group. The number of carbon atoms in the alkyl group substituted with a halogen atom is usually 1 to 25.

[0052] R 111Examples of the hydrocarbon group having 1 to 25 carbon atoms represented by the formula (I) include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a tert-butyl group, a sec-butyl group, an n-pentyl group, an isopentyl group, an n-hexyl group, an isohexyl group, an n-octyl group, an isooctyl group, an n-nonyl group, an isononyl group, an n-decyl group, an isodecyl group, an n-dodecyl group, an isododecyl group, an undecyl group, a lauryl group, a myristyl group, a cetyl group, and a stearyl group. Straight-chain or branched-chain alkyl groups include cycloalkyl groups having 3 to 25 carbon atoms, such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group; cycloalkylalkyl groups having 4 to 25 carbon atoms, such as a cyclopropylmethyl group and a cyclohexylmethyl group; aryl groups having 6 to 25 carbon atoms, such as a phenyl group, a naphthyl group, an anthracenyl group, and a biphenyl group; and aralkyl groups having 7 to 25 carbon atoms, such as a benzyl group, a phenylethyl group, a naphthylmethyl group, and a phenyl group. R 112 , R 113 and R 114 Examples of the alkyl group having 1 to 6 carbon atoms represented by the formula: 1A Examples include the same alkyl groups having 1 to 6 carbon atoms as those represented by the following formula:

[0053] R 111 is preferably an alkyl group having 4 to 25 carbon atoms, and more preferably an alkyl group having 4 to 12 carbon atoms. X 1 is -CO-* 1 and COO-* 1 It is preferable that:

[0054] R 6 and R 7 Preferably, the electron-withdrawing groups represented by the formula (I-1) are each independently a cyano group or a group represented by the formula (I-1).

[0055] R 1 and R 2 The ring structure formed by bonding together is R 1 and R 2is a nitrogen-containing ring structure containing a nitrogen atom to which R is bonded, and examples thereof include 4- to 10-membered nitrogen-containing heterocycles. 1 and R 2 The ring structure formed by the bonding of R may be a monocyclic ring or a polycyclic ring. Specific examples include a pyrrolidine ring, a pyrroline ring, an imidazolidine ring, an imidazoline ring, an oxazoline ring, a thiazoline ring, a piperidine ring, a morpholine ring, a piperazine ring, an indole ring, and an isoindole ring. 1 and R 2 The ring formed by bonding together may have a substituent, and examples of the substituent include a methyl group, an ethyl group, and the like. Examples of the alkyl groups include alkyl groups having 1 to 12 carbon atoms such as a propyl group, a butyl group, and an isobutyl group; and alkoxy groups having 1 to 12 carbon atoms such as a methoxy group, an ethoxy group, a propoxy group, and a butoxy group.

[0056] R 2 and R 3 The ring structure formed by bonding together is R 2 is a nitrogen-containing ring structure containing a nitrogen atom to which R is bonded, and examples thereof include 4- to 10-membered nitrogen-containing heterocycles. 2 and R 3 The ring structure formed by linking together may be a monocyclic ring or a polycyclic ring. Specific examples include a pyrrolidine ring, a pyrroline ring, an imidazolidine ring, an imidazoline ring, an oxazoline ring, a thiazoline ring, a piperidine ring, a morpholine ring, a piperazine ring, an indole ring, an isoindole ring, and a ring structure represented by the following formula (I-3). [ka] In formula (I-3), X represents a nitrogen atom, an oxygen atom, or a sulfur atom. Ring W 1 represents a ring having a nitrogen atom and X as components.

[0057] Ring W 1 is preferably a 5- or 6-membered ring having a nitrogen atom and X as constituent elements. Specific examples of the ring structure represented by formula (I-3) include the following rings. [ka]

[0058] R 2 and R 3 The ring structure formed by bonding together may have a substituent, and examples of the substituent include alkyl groups having 1 to 12 carbon atoms, such as a methyl group, an ethyl group, a propyl group, a butyl group, and an isobutyl group; and alkoxy groups having 1 to 12 carbon atoms, such as a methoxy group, an ethoxy group, a propoxy group, and a butoxy group.

[0059] R 2 and R 3 The ring structure formed by bonding together is preferably a ring structure represented by the following formula (I-4). [ka] [In formula (I-4), R 11 has the same meaning as above. m2 represents an integer of 1 to 7. R 11a , R 11b , R 11c and R 11d each independently represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms. * indicates a bond to a carbon atom. m2 is preferably 2 or 3, and more preferably 2.

[0060] R 2 and R 4 Examples of the ring structure formed by bonding R to each other include a 4- to 10-membered nitrogen-containing ring structure, and a 5- to 9-membered nitrogen-containing ring structure is preferred. 2 and R 4The ring structure formed by bonding together may be a monocyclic ring or a polycyclic ring. These rings may have a substituent. Examples of such ring structures include a pyrrole ring, an indole ring, a pyrimidine ring, and the rings described below. [ka]

[0061] R 2 and R 4 The ring structure formed by bonding together may have a substituent, and examples of the substituent include alkyl groups having 1 to 12 carbon atoms such as methyl groups, ethyl groups, propyl groups, butyl groups, and isobutyl groups; alkoxy groups having 1 to 12 carbon atoms such as methoxy groups, ethoxy groups, propoxy groups, and butoxy groups; -NR groups such as amino groups, methylamino groups, and dimethylamino groups. 22A R 22B A group represented by (R 22A and R 22B each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms); an alkylthio group having 1 to 12 carbon atoms, such as a methylthio group, an ethylthio group, a propylthio group, a butylthio group, or a pentylthio group; or a heterocyclic group having 4 to 9 carbon atoms, such as a pyrrolidinyl group, a piperidinyl group, or a morpholinyl group.

[0062] R 3 and R 6 The ring structure formed by linking these is R 3 -C=CC=CR 6 is a ring structure that forms the skeleton of the ring. For example, a phenyl group can be mentioned.

[0063] R 5 and R 7 Examples of the ring structure formed by linking R to each other include the ring structures shown below. 5 and R 7The ring structure formed by bonding together may have a substituent, and examples of the substituent include alkyl groups having 1 to 12 carbon atoms, such as a methyl group, an ethyl group, a propyl group, a butyl group, and an isobutyl group; and alkoxy groups having 1 to 12 carbon atoms, such as a methoxy group, an ethoxy group, a propoxy group, and a butoxy group. [ka]

[0064] R 6 and R 7 Examples of the ring structure formed by linking R to each other include the ring structures shown below. 6 and R 7 The ring structure formed by bonding together is a substituent (R1 to R 16 ) and examples of the substituent include alkyl groups having 1 to 12 carbon atoms such as methyl, ethyl, propyl, butyl, and isobutyl; alkoxy groups having 1 to 12 carbon atoms such as methoxy, ethoxy, propoxy, and butoxy; and ethylenically unsaturated groups described below. [ka] [In the formula, * represents a bond to a carbon atom.]

[0065] R 1 ~R 7 Examples of the ethylenically unsaturated group represented by the formula (I-1) include a vinyl group, an α-methylvinyl group, an acryloyl group, a methacryloyl group, an allyl group, a styryl group, and a group represented by the formula (I-2). [ka] [In formula (I-2), X 2 represents a vinyl group, an acryloyl group, or a methacryloyl group. R 115 represents a divalent aliphatic hydrocarbon group having 1 to 18 carbon atoms, and -CH2- contained in the aliphatic hydrocarbon group is -O-, -CO-, -CS- or NR 116- may be replaced with R 116 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. * represents a bond to a carbon atom or nitrogen atom.]

[0066] R 115 Examples of the divalent aliphatic hydrocarbon group having 1 to 18 carbon atoms represented by the formula (I) include alkanediyl groups having 1 to 18 carbon atoms, such as methylene, ethylene, propane-1,3-diyl, propane-1,2-diyl, butane-1,4-diyl, pentane-1,5-diyl, hexane-1,6-diyl, butane-1,3-diyl, 2-methylpropane-1,3-diyl, 2-methylpropane-1,2-diyl, pentane-1,4-diyl, and 2-methylbutane-1,4-diyl; and cycloalkanediyl groups having 3 to 18 carbon atoms, such as cyclopropanediyl, cyclobutanediyl, cyclopentanediyl, and cyclohexanediyl. A divalent aliphatic hydrocarbon group having 1 to 12 carbon atoms is preferred. R 116 Examples of the alkyl group having 1 to 6 carbon atoms represented by the formula: 1A Examples include the same alkyl groups having 1 to 6 carbon atoms as those represented by the following formula:

[0067] R 1 ~R 7 The ethylenically unsaturated groups represented by the formula (I-1) are preferably each independently a vinyl group, an acryloyl group, a methacryloyl group, or a group represented by the formula (I-2).

[0068] R 6 and R 7 It is preferred that either one of the groups is an electron-withdrawing group. R 6 and R 7 It is preferred that either one of the above is an ethylenically unsaturated group.

[0069] The structural unit derived from the compound represented by formula (I) is preferably a structural unit derived from the compound represented by formula (II). [ka] [In formula (II), R 11 , R 12 , R 13 , R 14 and R 15 each independently represents a hydrogen atom, an aliphatic hydrocarbon group having 1 to 25 carbon atoms which may have a substituent, or an aromatic hydrocarbon group or heterocyclic group having 6 to 15 carbon atoms which may have a substituent, and -CH2- contained in the aliphatic hydrocarbon group or aromatic hydrocarbon group is -NR 11A It may be substituted with -, -SO2-, -CO-, -O- or S-. R 16 and R 17 each independently represents a hydrogen atom, an alkyl group having 1 to 25 carbon atoms, an electron-withdrawing group, or an ethylenically unsaturated group. R 11A represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. R 12 and R 13 may be linked together to form a ring structure, R 12 and R 14 may be linked to each other to form a ring structure. However, R 16 or R 17 is an ethylenically unsaturated group.]

[0070] R 11 ~R 15 The aliphatic hydrocarbon group having 1 to 25 carbon atoms and optionally having a substituent represented by R 1 Examples of the aliphatic hydrocarbon groups include the same aliphatic hydrocarbon groups having 1 to 25 carbon atoms and optionally having a substituent, as represented by the following formula: R 11 ~R 15 The aromatic hydrocarbon group having 6 to 15 carbon atoms and optionally having a substituent represented by the formula (I) is R 1 Examples of the aromatic hydrocarbon group include the same aromatic hydrocarbon groups having 6 to 15 carbon atoms which may have a substituent and are represented by the following formula: R 11 ~R 15 As the heterocyclic ring represented by R1 The heterocycles are the same as those represented by the following formula:

[0071] R 16 and R 17 As the alkyl group having 1 to 25 carbon atoms represented by the formula 6 Examples include the same alkyl groups having 1 to 25 carbon atoms as those represented by the following formula: R 16 and R 17 Examples of the electron-withdrawing group represented by R 6 The electron-withdrawing groups include the same as those represented by the following formula: R 11A and R 11B Examples of the alkyl group having 1 to 6 carbon atoms represented by the formula: 1A Examples include the same alkyl groups having 1 to 6 carbon atoms as those represented by the following formula:

[0072] R 12 and R 13 The ring structures that can be formed by linking R 2 and R 3 The ring structures that can be formed by linking R 12 and R 13 The ring structure that can be formed by linking together is preferably a monocyclic structure.

[0073] R 12 and R 14 The ring structures that can be formed by linking R 2 and R 4 The ring structures that can be formed by linking R 12 and R 14 are connected to each other The ring structure that can be formed by bonding is preferably a monocyclic structure. 12 and R 14 The ring structure that can be formed by linking together is preferably an aromatic ring, more preferably a pyrimidine ring structure.

[0074] R 11 , R 13 and R 15are each independently preferably an aliphatic hydrocarbon group having 1 to 25 carbon atoms which may have a substituent, more preferably an alkyl group having 1 to 25 carbon atoms which may have a substituent, and even more preferably an alkyl group having 1 to 12 carbon atoms which may have a substituent. Especially R 11 The group is preferably an aliphatic hydrocarbon group having 1 to 10 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms, and even more preferably a methyl group. R 12 and R 14 are each independently an aliphatic hydrocarbon group having 1 to 25 carbon atoms which may have a substituent, or R 12 and R 14 are preferably linked to each other to form a ring structure. R 12 and R 13 are preferably linked to each other to form a ring structure, more preferably a ring structure represented by the above formula (I-4). Among the ring structures represented by formula (I-4), a ring structure represented by formula (I-4-1) or a ring structure represented by formula (I-4-2) is preferred, and a ring structure represented by formula (I-4-1) is particularly preferred. [ka] R 16 and R 17 Preferably, one of the groups is an ethylenically unsaturated group and the other is an electron-withdrawing group. R 16 and R 17 The electron-withdrawing groups represented by the formula (I-1) are preferably each independently a cyano group, a nitro group, a fluoro group, a trifluoromethyl group, or a group represented by the formula (I-1), and particularly preferably a cyano group. R 16 and R 17 The ethylenically unsaturated groups represented by the formula (I-1) are preferably each independently a vinyl group, an acryloyl group, a methacryloyl group, or a group represented by the formula (I-2). More preferably, *-CO-O-(CH)X2 , (X 2 is a vinyl group, represents an acryloyl group or a methacryloyl group, and n represents an integer of 1 to 10 (preferably n represents an integer of 2 to 6).

[0075] R 12 and R 13 The compound represented by formula (II) in which R are linked to each other to form a ring structure is preferably a compound represented by formula (II-A-1) or a compound represented by formula (II-A-2). 12 and R 14 The compound represented by formula (II) in which the groups are linked to each other to form a ring structure is preferably a compound represented by formula (II-B-1). [ka] [In formula (II-A-1), formula (II-A-2) and formula (II-B-1), R 11 , R 14 , R 15 , R 16 and R 17 have the same meanings as above. R 11e , R 11f , R 11g , R 11h , R 11k , R 11m , R 11n each independently represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms. R 11q and R 11p are each independently a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or -NR 22A R 22B A group represented by (R 22A and R 22B each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms) or a heterocycle.

[0076] For example, a compound represented by formula (II) in which the electron-withdrawing group is a cyano group can be obtained by reacting a compound represented by the following formula (I') with a compound represented by formula (L). [ka] [In the formula, R 222 represents a divalent linking group, and X 2 represents a polymerizable group.] The reaction between a compound represented by formula (I') and a compound represented by formula (L) can be carried out under any conditions commonly used in Knoevenagel condensation. For example, it is preferably carried out in the presence of a base or a carboxylic acid anhydride. Examples of bases include triethylamine, N,N-diisopropylethylamine, pyridine, piperidine, pyrrolidine, proline, N,N-dimethylaminopyridine, imidazole, sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, sodium bicarbonate, potassium bicarbonate, potassium tert-butoxide, sodium tert-butoxide, and sodium hydrogen carbonate. Examples of carboxylic acid anhydrides include acetic anhydride, succinic anhydride, phthalic anhydride, maleic anhydride, and benzoic anhydride. The amount of base used is preferably 0.1 to 10 mol per mol of the compound represented by formula (I'). The amount of acetic anhydride used is preferably 0.2 to 5 mol per mol of the compound represented by formula (I'). The reaction between the compound represented by formula (I') and the compound represented by formula (L) is preferably carried out in an organic solvent, such as toluene, acetonitrile, dichloromethane, or trichloromethane.

[0077] The reaction between the compound represented by formula (I') and the compound represented by formula (L) is carried out by mixing the compound represented by formula (I') and the compound represented by formula (L). The reaction temperature of the compound represented by formula (I') and the compound represented by formula (L) is preferably from -40 to 130°C, and the reaction time is usually preferably from 1 to 24 hours.

[0078] The compound represented by formula (I') can be synthesized, for example, according to the method described in JP-A-2014-194508.

[0079] The compound represented by formula (L) can be obtained, for example, by reacting cyanoacetic acid with a hydroxyalkyl acrylate. The amount of cyanoacetic acid used is preferably 0.5 to 3 moles per mole of hydroxyalkyl acrylate. The reaction between cyanoacetic acid and a hydroxyalkyl acrylate can be carried out using any esterification catalyst commonly used in esterification reactions, but is preferably carried out in the presence of a base and a carbodiimide condensing agent. Examples of bases include triethylamine, diisopropylethylamine, pyridine, piperidine, pyrrolidine, proline, N,N-dimethylaminopyridine, imidazole, sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, sodium bicarbonate, potassium bicarbonate, potassium tert-butoxide, sodium tert-butoxide, and sodium hydrogen carbonate. Examples of carbodiimide condensing agents include N,N-dicyclohexylcarbodiimide, N,N-diisopropylcarbodiimide, and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride. The amount of base used is preferably 0.5 to 5 moles per mole of cyanoacetic acid. The reaction between cyanoacetic acid and hydroxyalkyl acrylate is preferably carried out in an organic solvent, such as acetonitrile, isopropanol, toluene, trichloromethane, or dichloromethane.

[0080] The reaction of cyanoacetic acid with a hydroxyalkyl acrylate is carried out by mixing the cyanoacetic acid with the hydroxyalkyl acrylate. The reaction temperature between cyanoacetic acid and hydroxyalkyl acrylate is preferably −40 to 130° C., and the reaction time is usually preferably 1 to 24 hours.

[0081] Examples of the compound having a polymerizable group and a merocyanine structure include the compounds described below. [ka]

[0082] [ka]

[0083] [ka]

[0084] [ka]

[0085] [ka]

[0086] [ka]

[0087] [ka]

[0088] Resin (A) may be a homopolymer of a structural unit having a merocyanine structure in the side chain, or a copolymer containing a structural unit having a merocyanine structure in the side chain and other structural units. Resin (A) is preferably a copolymer. Examples of structural units that the resin (A) may contain in addition to the structural unit having a merocyanine structure in the side chain include structural units described in group A below. Group A: structural units derived from (meth)acrylic acid esters, structural units derived from styrene-based monomers, structural units derived from vinyl-based monomers, structural units represented by formula (a), structural units represented by formula (b), and structural units represented by formula (c) [ka] [In the formula, R a1 represents a divalent hydrocarbon group. R b1 and R b2 each independently represents a hydrogen atom or a hydrocarbon group. R c1 and R c2 each independently represents a divalent hydrocarbon group.

[0089] Examples of (meth)acrylic acid esters include linear alkyl esters of (meth)acrylic acid such as methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, n-heptyl (meth)acrylate, n-octyl (meth)acrylate, n-nonyl (meth)acrylate, n-decyl (meth)acrylate, n-dodecyl (meth)acrylate, lauryl (meth)acrylate, and stearyl (meth)acrylate; i-propyl (meth)acrylate, i-butyl (meth)acrylate, t-butyl (meth)acrylate, i-pentyl (meth)acrylate, i-hexyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate. branched alkyl esters of (meth)acrylic acid such as acrylate, i-octyl (meth)acrylate, i-nonyl (meth)acrylate, i-stearyl (meth)acrylate, and i-amyl (meth)acrylate; alicyclic skeleton-containing alkyl esters of (meth)acrylic acid such as cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, adamantyl (meth)acrylate, dicyclopentanyl (meth)acrylate, cyclododecyl (meth)acrylate, methylcyclohexyl (meth)acrylate, trimethylcyclohexyl (meth)acrylate, tert-butylcyclohexyl (meth)acrylate, and cyclohexyl α-ethoxyacrylate; and aromatic ring skeleton-containing esters of (meth)acrylic acid such as phenyl (meth)acrylate.

[0090] Examples of structural units derived from (meth)acrylic acid esters include substituted alkyl (meth)acrylates in which a substituent has been introduced into the alkyl group of a (meth)acrylic acid alkyl ester. The substituent of the substituted alkyl (meth)acrylate is a group that replaces a hydrogen atom of the alkyl group, and specific examples include a phenyl group, an alkoxy group, and a phenoxy group. Specific examples of the substituted alkyl (meth)acrylate include 2-methoxyethyl (meth)acrylate, ethoxymethyl (meth)acrylate, phenoxyethyl (meth)acrylate, 2-(2-phenoxyethoxy)ethyl (meth)acrylate, phenoxydiethylene glycol (meth)acrylate, and phenoxypoly(ethylene glycol) (meth)acrylate.

[0091] These (meth)acrylic acid esters may be used alone or in combination of two or more different types.

[0092] The resin (A) of the present invention preferably contains a structural unit derived from a (meth)acrylic acid alkyl ester (a1) whose homopolymer has a glass transition temperature (Tg) of less than 0°C, and a structural unit derived from a (meth)acrylic acid alkyl ester (a2) whose homopolymer has a Tg of 0°C or higher, among (meth)acrylic acid alkyl esters. This is advantageous in terms of improving the high-temperature durability of the pressure-sensitive adhesive layer. The Tg of the (meth)acrylic acid alkyl ester homopolymer can be, for example, a literature value such as that found in POLYMER HANDBOOK (Wiley-Interscience).

[0093] Specific examples of the (meth)acrylic acid alkyl ester (a1) include (meth)acrylic acid alkyl esters in which the alkyl group has about 2 to 12 carbon atoms, such as ethyl acrylate, n- and i-propyl acrylate, n- and i-butyl acrylate, n-pentyl acrylate, n- and i-hexyl acrylate, n-heptyl acrylate, n- and i-octyl acrylate, 2-ethylhexyl acrylate, n- and i-nonyl acrylate, n- and i-decyl acrylate, and n-dodecyl acrylate.

[0094] The (meth)acrylic acid alkyl ester (a1) may be used alone or in combination of two or more. Among them, n-butyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, etc. are preferred from the viewpoints of conformability and reworkability when laminated on an optical film.

[0095] The (meth)acrylic acid alkyl ester (a2) is a (meth)acrylic acid alkyl ester other than the (meth)acrylic acid alkyl ester (a1). Specific examples of the (meth)acrylic acid alkyl ester (a2) include methyl acrylate, cyclohexyl acrylate, isobornyl acrylate, stearyl acrylate, t-butyl acrylate, etc.

[0096] The (meth)acrylic acid alkyl ester (a2) may be used alone or in combination of two or more. Among them, from the viewpoint of high temperature durability, the (meth)acrylic acid alkyl ester (a2) preferably contains methyl acrylate, cyclohexyl acrylate, isobornyl acrylate, or the like, and more preferably contains methyl acrylate.

[0097] Further, examples of the structural unit derived from a (meth)acrylic acid ester include a structural unit derived from a (meth)acrylic acid ester having a polar functional group. Examples of the (meth)acrylic acid ester monomer having a polar functional group include 1-hydroxymethyl (meth)acrylate, 1-hydroxyethyl (meth)acrylate, 1-hydroxyheptyl (meth)acrylate, 1-hydroxybutyl (meth)acrylate, 1-hydroxypentyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 2-hydroxypentyl (meth)acrylate, 2-hydroxyhexyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, 3-hydroxypentyl (meth)acrylate, p) 3-hydroxyhexyl acrylate, 3-hydroxyheptyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 4-hydroxypentyl (meth)acrylate, 4-hydroxyhexyl (meth)acrylate, 4-hydroxyheptyl (meth)acrylate, 4-hydroxyoctyl (meth)acrylate, 2-chloro-2-hydroxypropyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, 5-hydroxypentyl (meth)acrylate, 5-hydroxyhexyl (meth)acrylate, 5-hydroxyheptyl (meth)acrylate, 5-hydroxyoctyl (meth)acrylate -Hydroxyoctyl (meth)acrylate, 5-hydroxynonyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 6-hydroxyheptyl (meth)acrylate, 6-hydroxyoctyl (meth)acrylate, 6-hydroxynonyl (meth)acrylate, 6-hydroxydecyl (meth)acrylate, 7-hydroxyheptyl (meth)acrylate, 7-hydroxyoctyl (meth)acrylate, 7-hydroxynonyl (meth)acrylate, 7-hydroxydecyl (meth)acrylate, 7-hydroxyundecyl (meth)acrylate acrylate, 8-hydroxyoctyl (meth)acrylate, 8-hydroxynonyl (meth)acrylate, 8-hydroxydecyl (meth)acrylate, 8-hydroxyundecyl (meth)acrylate, 8-hydroxydodecyl (meth)acrylate, 9-hydroxynonyl (meth)acrylate, 9-hydroxydecyl (meth)acrylate, 9-hydroxyundecyl (meth)acrylate, 9-hydroxydodecyl (meth)acrylate, 9-hydroxytridecyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, (meth) 10-Hydroxyundecyl acrylate, 10-hydroxydodecyl (meth)acrylate, 10-hydroxytridecyl acrylate, 10-hydroxytetradecyl (meth)acrylate, 11-hydroxyundecyl (meth)acrylate, 11-hydroxydodecyl (meth)acrylate, 11-hydroxytridecyl (meth)acrylate, 11-hydroxytetradecyl (meth)acrylate, 11-hydroxypentadecyl (meth)acrylate, 12-hydroxydodecyl (meth)acrylate, 12-hydroxy(meth)acrylate and alkyl (meth)acrylates having a hydroxy group, such as 12-hydroxytetradecyl (meth)acrylate, 13-hydroxypentadecyl (meth)acrylate, 13-hydroxytetradecyl (meth)acrylate, 13-hydroxypentadecyl (meth)acrylate, 14-hydroxytetradecyl (meth)acrylate, 14-hydroxypentadecyl (meth)acrylate, 15-hydroxypentadecyl (meth)acrylate, and 15-hydroxyheptadecyl (meth)acrylate.

[0098] Examples of styrene-based monomers include styrene; alkyl styrenes such as methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene, triethylstyrene, propylstyrene, butylstyrene, hexylstyrene, heptylstyrene, and octylstyrene; halogenated styrenes such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene, and iodostyrene; nitrostyrene; acetylstyrene; methoxystyrene; and divinylbenzene.

[0099] Examples of vinyl monomers include fatty acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, and vinyl laurate; vinyl halides such as vinyl chloride and vinyl bromide; vinylidene halides such as vinylidene chloride; nitrogen-containing heteroaromatic vinyls such as vinylpyridine, vinylpyrrolidone, and vinylcarbazole; conjugated dienes such as butadiene, isoprene, and chloroprene; and unsaturated nitriles such as acrylonitrile and methacrylonitrile.

[0100] The compound from which the structural unit represented by formula (a) is derived can be synthesized, for example, by reacting a diisocyanate compound with a polyol. The compound leading to the structural unit represented by formula (b) can be synthesized, for example, by reacting a halogenated silane or a silane having a hydroxy group. The compound leading to the structural unit represented by formula (c) can be synthesized, for example, by the reaction of a polycarboxylic acid with a polyol.

[0101] The structural unit selected from the structural units described in Group A is preferably a structural unit derived from a (meth)acrylic acid ester. The structural unit derived from a (meth)acrylic acid ester is preferably a (meth)acrylic acid alkyl ester or a (meth)acrylic acid alkyl ester having a hydroxy group.

[0102] The resin (A) of the present invention may further contain another structural unit (sometimes referred to as structural unit (aa)). Specific examples thereof include a structural unit derived from a (meth)acrylamide-based monomer, a structural unit derived from a monomer having a carboxyl group, a structural unit derived from a monomer having a heterocyclic group, and a structural unit derived from a monomer having a substituted or unsubstituted amino group.

[0103] Examples of (meth)acrylamide monomers include N-methylol (meth)acrylamide, N-(2-hydroxyethyl) (meth)acrylamide, N-(3-hydroxypropyl) (meth)acrylamide, N-(4-hydroxybutyl) (meth)acrylamide, N-(5-hydroxypentyl) (meth)acrylamide, N-(6-hydroxyhexyl) (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N-isopropyl (meth)acrylamide, N-(3-dimethylaminopropyl) (meth)acrylamide, N-(1,1-dimethyl-3-oxobutyl) (meth)acrylamide, N-[2-(2-oxo-1-imidazolidinyl)ethyl] (meth)acrylamide, 2-acryloylamino-2-methyl-1-propanesulfonic acid, N-(methoxymethyl)acrylamide, N-(ethoxymethyl) (meth)acrylamide, N-(propoxymethyl)(meth)acrylamide, N-(1-methylethoxymethyl)(meth)acrylamide, N-(1-methylpropoxymethyl)(meth)acrylamide, N-(2-methylpropoxymethyl)(meth)acrylamide, N-(butoxymethyl)(meth)acrylamide, N-(1,1-dimethylethoxymethyl)(meth)acrylamide, N-(2-methoxyethyl)(meth)acrylamide, N-(2-ethoxyethyl)(meth)acrylamide Examples of such acrylamide include N-(2-methylethoxy)ethyl (meth)acrylamide, N-(2-propoxyethyl) (meth)acrylamide, N-(2-(1-methylethoxy)ethyl) (meth)acrylamide, N-(2-(1-methylpropoxy)ethyl) (meth)acrylamide, N-(2-(2-methylpropoxy)ethyl) (meth)acrylamide, N-(2-butoxyethyl) (meth)acrylamide, and N-(2-(1,1-dimethylethoxy)ethyl) (meth)acrylamide. Among these, N-(methoxymethyl)acrylamide, N-(ethoxymethyl)acrylamide, N-(propoxymethyl)acrylamide, N-(butoxymethyl)acrylamide, and N-(2-methylpropoxymethyl)acrylamide are preferred.

[0104] Examples of the monomer having a carboxyl group include (meth)acrylic acid, carboxyalkyl (meth)acrylate (e.g., carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate), maleic acid, maleic anhydride, fumaric acid, and crotonic acid, with acrylic acid being preferred.

[0105] Examples of the monomer having a heterocyclic group include acryloylmorpholine, vinylcaprolactam, N-vinyl-2-pyrrolidone, vinylpyridine, tetrahydrofurfuryl (meth)acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, glycidyl (meth)acrylate, and 2,5-dihydrofuran.

[0106] Examples of the monomer having a substituted or unsubstituted amino group include aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and dimethylaminopropyl (meth)acrylate.

[0107] The structural unit (aa) other than the structural unit having a merocyanine structure and the structural unit selected from group A is preferably a monomer having a carboxyl group.

[0108] The content of the structural unit having a merocyanine structure in the side chain is the total of all structural units contained in resin (A). The amount is preferably 0.01 to 50 parts by mass, more preferably 0.1 to 20 parts by mass, and even more preferably 0.5 to 10 parts by mass, per 100 parts by mass. The content of at least one structural unit selected from the structural units described in group A is preferably 50 parts by mass or more, and more preferably 60 to 99.99 parts by mass, per 100 parts by mass of all structural units in resin (A).

[0109] When the resin (A) contains the structural unit (aa), the amount thereof is preferably 20 parts by mass or less, more preferably 0.5 to 15 parts by mass, even more preferably 0.5 to 10 parts by mass, and particularly preferably 1 to 7 parts by mass, relative to 100 parts by mass of all structural units of the resin (A).

[0110] When the resin (A) contains a structural unit derived from a (meth)acrylic acid alkyl ester having a hydroxy group, the content of the structural unit is preferably 20 parts by mass or less, more preferably 0.5 parts by mass or more and 15 parts by mass or less, even more preferably 0.5 parts by mass or more and 10 parts by mass or less, and particularly preferably 1 part by mass or more and 7 parts by mass or less, relative to 100 parts by mass of all structural units of the resin (A). From the viewpoint of preventing an increase in the peel strength of a separate film that can be laminated on the outer surface of the pressure-sensitive adhesive layer, it is preferable that the resin (A) is substantially free of a monomer having an amino group, where "substantially free" means that the amount of the monomer is 0.1 part by mass or less per 100 parts by mass of all structural units that constitute the resin (A).

[0111] In terms of reactivity between resin (A) and crosslinking agent (B), described below, resin (A) preferably contains structural units derived from a (meth)acrylic acid alkyl ester having a hydroxy group or structural units derived from a monomer having a carboxyl group, and more preferably contains both structural units derived from a (meth)acrylic acid alkyl ester having a hydroxy group and structural units derived from a monomer having a carboxyl group. Preferred examples of (meth)acrylic acid alkyl esters having a hydroxy group include 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 5-hydroxypentyl acrylate, and 6-hydroxyhexyl acrylate. In particular, the use of 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, and 5-hydroxypentyl acrylate can provide excellent durability. Preferred examples of monomers having a carboxyl group include acrylic acid.

[0112] The weight-average molecular weight (Mw) of the resin (A) is preferably 300,000 to 2.5 million, more preferably 500,000 to 2.5 million. A weight-average molecular weight of 300,000 or more improves the durability of the pressure-sensitive adhesive layer in high-temperature environments and tends to suppress defects such as peeling between the adherend and the photoselectively absorbing pressure-sensitive adhesive layer and cohesive failure of the photoselectively absorbing pressure-sensitive adhesive layer. A weight-average molecular weight of 2.5 million or less is advantageous in terms of coatability when the pressure-sensitive adhesive composition is processed into, for example, a sheet (applied to a substrate). From the viewpoint of achieving both the durability of the photoselectively absorbing pressure-sensitive adhesive layer and the coatability of the pressure-sensitive adhesive composition, the weight-average molecular weight is preferably 600,000 to 1.8 million, more preferably 700,000 to 1.7 million, and particularly preferably 1,000,000 to 1.6 million. The molecular weight distribution (Mw / Mn), expressed as the ratio of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn), is usually 2 to 10, preferably 3 to 8. The weight average molecular weight can be analyzed by gel permeation chromatography and is a value converted into standard polystyrene.

[0113] When the resin (A) is dissolved in ethyl acetate to prepare a 20% by mass solution, the viscosity at 25°C is preferably 20 Pa·s or less, and more preferably 0.1 to 15 Pa·s. A viscosity in this range is advantageous from the viewpoint of coatability when the pressure-sensitive adhesive composition is applied to a substrate. The viscosity can be measured using a Brookfield viscometer.

[0114] The resin (A) of the present invention can be produced by known methods such as solution polymerization, bulk polymerization, suspension polymerization, and emulsion polymerization, with solution polymerization being particularly preferred. Examples of solution polymerization include mixing monomers and an organic solvent, adding a thermal polymerization initiator under a nitrogen atmosphere, and stirring for approximately 3 to 15 hours at a temperature of 40 to 90°C, preferably 50 to 80°C. To control the reaction, the monomers and thermal polymerization initiator may be added continuously or intermittently during polymerization. The monomers and thermal initiator may be added to the organic solvent.

[0115] As the polymerization initiator, a thermal polymerization initiator or a photopolymerization initiator is used. Examples of the photopolymerization initiator include 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl) ketone. Examples of the thermal polymerization initiator include azo compounds such as 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane-1-carbonitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxyvaleronitrile), dimethyl-2,2'-azobis(2-methylpropionate), and 2,2'-azobis(2-hydroxymethylpropionitrile); lauryl Examples of suitable initiators include organic peroxides such as peroxide, t-butyl hydroperoxide, benzoyl peroxide, t-butyl peroxybenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, dipropyl peroxydicarbonate, t-butyl peroxyneodecanoate, t-butyl peroxypivalate, and (3,5,5-trimethylhexanoyl) peroxide; and inorganic peroxides such as potassium persulfate, ammonium persulfate, and hydrogen peroxide. Redox initiators that combine a peroxide with a reducing agent can also be used.

[0116] The proportion of the polymerization initiator is about 0.001 to 5 parts by mass relative to 100 parts by mass of the total amount of the monomers constituting the resin (A). Polymerization of the resin (A) may be carried out using a polymerization method using active energy rays (for example, ultraviolet rays).

[0117] Examples of organic solvents include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; aliphatic alcohols such as propyl alcohol and isopropyl alcohol; and ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone.

[0118] The resin (A) is preferably a resin that satisfies the following formula (1), and more preferably a resin that satisfies the following formula (2). ε(405)≧0.02 (1) [In equation (1), ε(405) represents the gram absorption coefficient of the resin at a wavelength of 405 nm. The unit of the gram absorption coefficient is L / (g·cm)] ε(405) / ε(440)≧5 (2) [In formula (2), ε(405) represents the gram absorption coefficient of the resin at a wavelength of 405 nm, and ε(440) represents the gram absorption coefficient of the resin at a wavelength of 440 nm.] The gram absorbance coefficient of the resin (A) can be measured by the method described in the Examples.

[0119] The larger the ε(405) value of resin (A), the more easily it absorbs light with a wavelength of 405 nm. The ε(405) value is preferably 0.02 L / (g·cm) or more, more preferably 0.1 L / (g·cm) or more, even more preferably 0.2 L / (g·cm) or more, and is usually 10 L / (g·cm) or less. When a pressure-sensitive adhesive composition containing resin (A) is applied to a display device (FPD: flat panel display) such as an organic electroluminescent display (organic EL display device) or a liquid crystal display device, if the ε(405) of resin (A) is 0.02 L / (g·cm) or more, the absorption performance of visible light in the vicinity of 400 nm is good, and therefore, deterioration of retardation films and organic EL light-emitting elements used in displays such as organic EL display devices and liquid crystal display devices due to visible light can be suppressed. It can be controlled.

[0120] The larger the value of ε(405) / ε(440), the more selectively resin (A) can absorb light with a wavelength around 400 nm. The value of ε(405) / ε(440) is preferably 5 or more, more preferably 50 or more, even more preferably 75 or more, and particularly preferably 100 or more. When the ε(405) / ε(440) of the resin (A) is 5 or more, when a pressure-sensitive adhesive composition containing the resin (A) is applied to a display device (FPD: flat panel display) such as an organic electroluminescence (EL) display device or a liquid crystal display device, the composition can absorb light in the vicinity of 405 nm and suppress photodegradation of the retardation film, organic EL element, etc. without impairing the color expression of the display device.

[0121] (Other components contained in the adhesive composition) The pressure-sensitive adhesive composition may further contain a crosslinking agent (B), a silane compound (D), an antistatic agent, a selective light absorber, a resin other than the resin (A), and the like. The content of the resin (A) is usually 60% by mass to 99.99% by mass, preferably 70% by mass to 99.9% by mass, and more preferably 80% by mass to 99.7% by mass, based on 100% by mass of the solid content of the adhesive composition.

[0122] The pressure-sensitive adhesive composition may contain a crosslinking agent (B). Examples of the crosslinking agent (B) include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, aziridine-based crosslinking agents, and metal chelate-based crosslinking agents. In particular, from the viewpoints of the pot life of the pressure-sensitive adhesive composition, the durability of the pressure-sensitive adhesive layer, and the crosslinking rate, isocyanate-based crosslinking agents are preferred.

[0123] The isocyanate compound is preferably a compound having at least two isocyanato groups (-NCO) in the molecule, and examples thereof include aliphatic isocyanate compounds (such as hexamethylene diisocyanate), alicyclic isocyanate compounds (such as isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate), and aromatic isocyanate compounds (such as tolylene diisocyanate, xylylene diisocyanate diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, etc.). The crosslinking agent (B) may also be a derivative of an adduct of the isocyanate compound with a polyhydric alcohol compound (e.g., an adduct with glycerol, trimethylolpropane, etc.), an isocyanurate, a biuret-type compound, or a urethane prepolymer-type isocyanate compound obtained by addition reaction with a polyether polyol, polyester polyol, acrylic polyol, polybutadiene polyol, polyisoprene polyol, etc. The crosslinking agent (B) may be used alone or in combination of two or more. Representative examples of these include aromatic isocyanate compounds (e.g., tolylene diisocyanate, xylylene diisocyanate), aliphatic isocyanate compounds (e.g., hexamethylene diisocyanate), or their adducts with a polyhydric alcohol compound (e.g., glycerol, trimethylolpropane), or isocyanurates. When the crosslinking agent (B) is an aromatic isocyanate compound and / or an adduct thereof with a polyhydric alcohol compound or an isocyanurate, the durability of the pressure-sensitive adhesive layer can be improved, possibly because it is advantageous for forming an optimal crosslink density (or crosslinked structure). In particular, when the crosslinking agent (B) is a tolylene diisocyanate compound and / or an adduct thereof with a polyhydric alcohol compound, the durability can be improved even when the pressure-sensitive adhesive layer is applied to a polarizing plate, for example.

[0124] The content of the crosslinking agent (B) is usually 0.01 to 15 parts by mass, preferably 0.05 to 10 parts by weight, and more preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the resin (A).

[0125] The pressure-sensitive adhesive composition may further contain a silane compound (D). Examples of the silane compound (D) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, and 3-mercaptopropyltrimethoxysilane. The silane compound (D) may be a silicone oligomer. Specific examples of the silicone oligomer, expressed in the form of a combination of monomers, are as follows:

[0126] Mercaptopropyl group-containing oligomers such as 3-mercaptopropyltrimethoxysilane-tetramethoxysilane oligomer, 3-mercaptopropyltrimethoxysilane-tetraethoxysilane oligomer, 3-mercaptopropyltriethoxysilane-tetramethoxysilane oligomer, and 3-mercaptopropyltriethoxysilane-tetraethoxysilane oligomer; mercaptomethyl group-containing oligomers such as mercaptomethyltrimethoxysilane-tetramethoxysilane oligomer, mercaptomethyltrimethoxysilane-tetraethoxysilane oligomer, mercaptomethyltriethoxysilane-tetramethoxysilane oligomer, and mercaptomethyltriethoxysilane-tetraethoxysilane oligomer; 3-glycidyloxysilane copolymers containing 3-glycidoxypropyl groups, such as 3-glycidoxypropyltrimethoxysilane-tetramethoxysilane copolymer, 3-glycidoxypropyltriethoxysilane-tetramethoxysilane copolymer, 3-glycidoxypropyltriethoxysilane-tetramethoxysilane copolymer, 3-glycidoxypropyltriethoxysilane-tetraethoxysilane copolymer, 3-glycidoxypropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-glycidoxypropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-glycidoxypropylmethyldiethoxysilane-tetramethoxysilane copolymer, and 3-glycidoxypropylmethyldiethoxysilane-tetraethoxysilane copolymer;Methacryloyloxypropyl group-containing oligomers such as 3-methacryloyloxypropyltrimethoxysilane-tetramethoxysilane oligomer, 3-methacryloyloxypropyltrimethoxysilane-tetraethoxysilane oligomer, 3-methacryloyloxypropyltriethoxysilane-tetramethoxysilane oligomer, 3-methacryloyloxypropyltriethoxysilane-tetraethoxysilane oligomer, 3-methacryloyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer, 3-methacryloyloxypropylmethyldimethoxysilane-tetraethoxysilane oligomer, 3-methacryloyloxypropylmethyldiethoxysilane-tetramethoxysilane oligomer, and 3-methacryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer; 3-acryloyloxypropyltrimethoxysilane-tetramethoxysilane oligomer, 3-acryloyloxypropyltrimethoxysilane-tetramethoxysilane oligomer, acryloyloxypropyl group-containing oligomers such as vinyltrimethoxysilane-tetraethoxysilane oligomer, 3-acryloyloxypropyltriethoxysilane-tetramethoxysilane oligomer, 3-acryloyloxypropyltriethoxysilane-tetraethoxysilane oligomer, 3-acryloyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer, 3-acryloyloxypropylmethyldimethoxysilane-tetraethoxysilane oligomer, 3-acryloyloxypropylmethyldiethoxysilane-tetramethoxysilane oligomer, and 3-acryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer; vinyltrimethoxysilane-tetramethoxysilane oligomer, vinyltrimethoxysilane-tetraethoxysilane oligomer, vinyltriethoxysilane-tetramethoxysilane oligomer, vinyltriethoxysilane-tetraethoxysilane oligomer, vinylmethyldimethoxysilane-tetramethoxysilane; vinyl group-containing oligomers such as vinylmethyldimethoxysilane-tetraethoxysilane oligomer, vinylmethyldiethoxysilane-tetramethoxysilane oligomer, and vinylmethyldiethoxysilane-tetraethoxysilane oligomer; and amino group-containing copolymers such as 3-aminopropyltrimethoxysilane-tetramethoxysilane copolymer, 3-aminopropyltrimethoxysilane-tetraethoxysilane copolymer, 3-aminopropyltriethoxysilane-tetramethoxysilane copolymer, 3-aminopropyltriethoxysilane-tetraethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-aminopropylmethyldiethoxysilane-tetramethoxysilane copolymer, and 3-aminopropylmethyldiethoxysilane-tetraethoxysilane copolymer.

[0127] The silane compound (D) may be a silane compound represented by the following formula (d1): [ka] (In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and —CH— constituting the alkanediyl group or the alicyclic hydrocarbon group may be replaced by —O— or —CO—; R 41 represents an alkyl group having 1 to 5 carbon atoms, and R 42 , R 43 , R 44 , R 45 and R 46 each independently represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms.)

[0128] Examples of the alkanediyl group having 1 to 20 carbon atoms represented by A include methylene, 1,2-ethanediyl, 1,3-propanediyl, 1,4-butanediyl, 1,5-pentanediyl, 1,6-hexanediyl, 1,7-heptanediyl, 1,8-octanediyl, 1,9-nonanediyl, 1,10-decanediyl, 1,12-dodecanediyl, 1,14-tetradecanediyl, 1,16-hexadecanediyl, 1,18-octadecanediyl, and 1,20-icosanediyl. Examples of the divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms include 1,3-cyclopentanediyl and 1,4-cyclohexanediyl. Examples of the alkanediyl group and the alicyclic hydrocarbon group in which -CH2- is replaced with -O- or -CO- include -CH2CH2-O-CH2CH2-, -CH2CH2-O-CH2CH2-O-CH2CH2-, -CH2CH2-O-CH2CH2-O-CH2CH2-O-CH2CH2-, -CH2CH2-CO-O-CH2CH2-, -CH2CH2-O-CH2CH2-CO-O-CH2CH2-, -CH2CH2CH2CH2-O-CH2CH2- and CH2CH2CH2CH2-O-CH2CH2CH2-.

[0129] R 41 ~R 45 Examples of the alkyl group having 1 to 5 carbon atoms represented by the formula (I) include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, and a pentyl group. 42 ~R 45 Examples of the alkoxy group having 1 to 5 carbon atoms represented by the formula (I) include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, an isobutoxy group, a tert-butoxy group, and a pentyloxy group.

[0130] Examples of the silane compound represented by formula (d1) include (trimethoxysilyl)methane. , 1,2-bis(trimethoxysilyl)ethane, 1,2-bis(triethoxysilyl)ethane, 1,3-bis(trimethoxysilyl)propane, 1,3-bis(triethoxysilyl)propane, 1,4-bis(trimethoxysilyl)butane, 1,4-bis(triethoxysilyl)butane, 1,5-bis(trimethoxysilyl)pentane, 1,5-bis(triethoxysilyl)pentane, 1,6-bis(trimethoxysilyl)hexane, 1,6-bis(triethoxysilyl)hexane, 1,6-bis(trippropoxysilyl)hexane, 1,8-bis(trimethoxysilyl)octane, 1,8-bis(triethoxysilyl)octane, 1,8-bis(trippropoxysilyl)octane, and other bis(triC1-5alkoxysilyl)C1-10 alkanes; biphenyls; bis(diC1-5 alkoxyC1-5 alkylsilyl)C1-10 alkanes such as bis(dimethoxymethylsilyl)methane, 1,2-bis(dimethoxymethylsilyl)ethane, 1,2-bis(dimethoxyethylsilyl)ethane, 1,4-bis(dimethoxymethylsilyl)butane, 1,4-bis(dimethoxyethylsilyl)butane, 1,6-bis(dimethoxymethylsilyl)hexane, 1,6-bis(dimethoxyethylsilyl)hexane, 1,8-bis(dimethoxymethylsilyl)octane, and 1,8-bis(dimethoxyethylsilyl)octane; and bis(monoC1-5 alkoxy-diC1-5 alkylsilyl)C1-10 alkanes such as 1,6-bis(methoxydimethylsilyl)hexane and 1,8-bis(methoxydimethylsilyl)octane. Of these, bis(triC1-3 alkoxysilyl)C1-10 alkanes such as 1,2-bis(trimethoxysilyl)ethane, 1,3-bis(trimethoxysilyl)propane, 1,4-bis(trimethoxysilyl)butane, 1,5-bis(trimethoxysilyl)pentane, 1,6-bis(trimethoxysilyl)hexane, and 1,8-bis(trimethoxysilyl)octane are preferred, and 1,6-bis(trimethoxysilyl)hexane and 1,8-bis(trimethoxysilyl)octane are particularly preferred.

[0131] The content of the silane compound (D) is usually 0.01 to 10 parts by mass, preferably 0.03 to 5 parts by mass, more preferably 0.05 to 2 parts by mass, and even more preferably 0.1 to 1 part by mass, relative to 100 parts by mass of the resin (A).

[0132] The pressure-sensitive adhesive composition may further contain an antistatic agent. Examples of antistatic agents include surfactants, siloxane compounds, conductive polymers, and ionic compounds, with ionic compounds being preferred. Examples of ionic compounds include conventional compounds. Examples of cationic components constituting the ionic compounds include organic cations and inorganic cations. Examples of organic cations include pyridinium cation, pyrrolidinium cation, piperidinium cation, imidazolium cation, ammonium cation, sulfonium cation, and phosphonium cation. Examples of inorganic cations include alkali metal cations such as lithium cation, potassium cation, sodium cation, and cesium cation, and alkaline earth metal cations such as magnesium cation and calcium cation. In particular, from the viewpoint of compatibility with (meth)acrylic resins, pyridinium cation, imidazolium cation, pyrrolidinium cation, lithium cation, and potassium cation are preferred. Examples of anionic components constituting the ionic compounds may be either inorganic or organic anions, but from the viewpoint of antistatic performance, an anionic component containing a fluorine atom is preferred. Examples of anion components containing fluorine atoms include hexafluorophosphate anion (PF6-), bis(trifluoromethanesulfonyl)imide anion [(CF3SO2)2N-], bis(fluorosulfonyl)imide anion [(FSO2)2N-], and tetra(pentafluorophenyl)borate anion [(CF6F5)4B-]. These ionic compounds can be used alone or in combination. In particular, bis(trifluoromethanesulfonyl)imide anion [(CF3SO2)2N-], bis(fluorosulfonyl)imide anion [(FSO2)2N-], and tetra(pentafluorophenyl)borate anion [(CF6F5)4B-] are particularly preferred. B-] is preferred. In terms of the stability over time of the antistatic performance of the photoselective absorbing pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition, an ionic compound that is solid at room temperature is preferred.

[0133] The content of the antistatic agent is, for example, 0.01 to 20 parts by mass, preferably 0.1 to 10 parts by mass, and more preferably 1 to 7 parts by mass, relative to 100 parts by mass of the resin (A).

[0134] The pressure-sensitive adhesive composition contains a resin (A) that is a photoselective absorbing polymer, and may or may not contain a photoselective absorber. It is preferable that the pressure-sensitive adhesive composition does not contain a photoselective absorber. The photoselective absorber selectively absorbs light of a specific wavelength, and preferably contains a compound having at least one absorption maximum in a wavelength range of 360 nm to 420 nm, more preferably a compound having an absorption maximum in a wavelength range of 380 nm to 410 nm. When a photoselective absorber is contained, the content of the photoselective absorber is preferably 0.5 parts by mass or less per 100 parts by mass of the total resin components. Since there is a correlation between the content of the photoselective absorber and the degree of color fading at the edge of a polarizer under high temperature and high humidity, the content of the photoselective absorber is preferably 0.5 parts by mass or less in order to suppress color fading.

[0135] The photoselective absorber is not particularly limited, and examples thereof include organic photoselective absorbers such as oxybenzophenone-based photoselective absorbers, benzotriazole-based photoselective absorbers, salicylic acid ester-based photoselective absorbers, benzophenone-based photoselective absorbers, cyanoacrylate-based photoselective absorbers, and triazine-based photoselective absorbers. More specific examples include 5-chloro-2-(3,5-di-sec-butyl-2-hydroxylphenyl)-2H-benzotriazole, (2-2H-benzotriazol-2-yl)-6-(linear and branched chain dodecyl)-4-methylphenol, 2-hydroxy-4-benzyloxybenzophenone, and 2,4-benzyloxybenzophenone. These organic photoselective absorbers may be used alone or in combination of two or more.

[0136] The photoselective absorber may be a commercially available product. Examples of triazine-based photoselective absorbers include "Kemisorb 102" manufactured by Chemipro Chemical Co., Ltd., "ADK STAB LA46" and "ADK STAB LAF70" manufactured by ADEKA Corporation, and "TINUVIN 109," "TINUVIN 171," "TINUVIN 234," "TINUVIN 326," "TINUVIN 327," "TINUVIN 328," "TINUVIN 928," "TINUVIN 400," "TINUVIN 460," "TINUVIN 405," and "TINUVIN 477" manufactured by BASF Japan Ltd. Examples of benzotriazole-based photoselective absorbers include "ADK STAB LA31" and "ADK STAB LA36" manufactured by ADEKA CORPORATION; "SUMISORB 200," "SUMISORB 250," "SUMISORB 300," "SUMISORB 340," and "SUMISORB 350" manufactured by Sumika Chemtex Co., Ltd.; "Kemisorb 74," "Kemisorb 79," and "Kemisorb 279" manufactured by Chemipro Chemical Co., Ltd.; and "TINUVIN 99-2," "TINUVIN 900," and "TINUVIN 928" manufactured by BASF.

[0137] The light-selective absorber may be an inorganic light-selective absorber. Examples of inorganic light-selective absorbers include titanium oxide, zinc oxide, indium oxide, tin oxide, talc, kaolin, calcium carbonate, titanium oxide-based composite oxides, zinc oxide-based composite oxides, ITO (tin-doped indium oxide), and ATO (antimony-doped tin oxide). Examples of titanium oxide-based composite oxides include zinc oxide doped with silica and alumina. These inorganic light-selective absorbers can be used alone or in combination of two or more. An organic light-selective absorber and an inorganic light-selective absorber may also be used in combination.

[0138] The pressure-sensitive adhesive composition may contain one or more additives such as solvents, crosslinking catalysts, tackifiers, plasticizers, softeners, pigments, rust inhibitors, inorganic fillers, and light-scattering fine particles. .

[0139] [Middle layer] The optical laminate of the present invention includes an intermediate layer 300. The intermediate layer 300 has only one or more layers selected from the group consisting of a liquid crystal curing layer, an alignment layer, and an attachment layer. The thickness of the intermediate layer 300 is not limited, but is, for example, from 1 μm to 200 μm, and preferably from 5 μm to 200 μm.

[0140] From the viewpoint of suppressing discoloration in the polarizer 10, the intermediate layer 300 preferably does not contain a light selective absorber. When the intermediate layer 300 contains a light selective absorber, the content of the light selective absorber per unit area is preferably 0.5 g / m. 2 It is preferable that:

[0141] [Liquid crystal hardening layer] The optical laminate of the present invention may include a cured liquid crystal layer as an intermediate layer. The cured liquid crystal layer may be one layer or two or more layers. The optical laminate 101 shown in FIG. 2 includes a first cured liquid crystal layer 30 and a second cured liquid crystal layer 31.

[0142] The liquid crystal cured layer is a layer of a cured product of a polymerizable liquid crystal compound, and is, for example, a retardation layer. The retardation layer which is a cured product of a polymerizable liquid crystal compound includes first to fifth embodiments. First form: A retardation layer in which rod-like liquid crystal compounds are aligned horizontally to the supporting substrate Second form: Retardation layer in which rod-like liquid crystal compounds are aligned perpendicular to the substrate Third type: Retardation layer in which the direction of the rod-like liquid crystal molecules is helically oriented in the plane Fourth form: Retardation layer in which discotic liquid crystal compounds are tilted Fifth form: Biaxial retardation layer in which discotic liquid crystal compounds are aligned perpendicular to the substrate For example, the first, second, and fifth embodiments are preferably used as optical films for organic electroluminescence displays, or retardation layers of these embodiments may be laminated and used.

[0143] The retardation layer preferably has reverse wavelength dispersion. Reverse wavelength dispersion is an optical property in which the in-plane retardation value of liquid crystal alignment at a short wavelength is smaller than the in-plane retardation value of liquid crystal alignment at a long wavelength, and preferably the retardation layer satisfies the following formulas (7) and (8). Here, Re(λ) represents the in-plane retardation value for light with a wavelength of λ nm. Re(450) / Re(550)≦1 (7) 1≦Re(630) / Re(550) (8) In the optical laminate of the present invention, when the retardation layer is in the first form and has reverse wavelength dispersion, coloration during black display on a display device is reduced, which is preferable, and in the formula (7), 0.82≦Re(450) / Re(550)≦0.93 is more preferable, and 120≦Re(550)≦150 is even more preferable.

[0144] Examples of the polymerizable liquid crystal compound used for forming the retardation layer include compounds having a polymerizable group among the compounds described in "3.8.6 Network (Completely Crosslinked)" and "6.5.1 Liquid Crystal Materials b. Polymerizable Nematic Liquid Crystal Materials" in Liquid Crystal Handbook (edited by Liquid Crystal Handbook Editorial Committee, published by Maruzen Co., Ltd. on October 30, 2000), as well as the polymerizable liquid crystal compounds described in JP 2010-31223 A, JP 2010-270108 A, JP 2011-6360 A, JP 2011-207765 A, JP 2011-162678 A, JP 2016-81035 A, WO 2017 / 043438 A and JP 2011-207765 A. A method for producing a retardation layer from a polymer in an oriented state of a polymerizable liquid crystal compound is, for example, Examples of such methods include the method described in JP-A-2010-31223.

[0145] The thickness of the retardation layer, which is a liquid crystal cured layer obtained by curing a polymerizable liquid crystal compound, is, for example, 0.1 μm to 10 μm, preferably 0.5 μm to 8 μm, and more preferably 1 μm to 6 μm.

[0146] The retardation layer can be a λ / 4 retardation layer that imparts a retardation of ¼ wavelength to transmitted light, a λ / 2 retardation layer that imparts a retardation of ½ wavelength to transmitted light, a positive A plate, or a positive C plate. When the optical laminate 101 shown in Fig. 2 includes a first cured liquid crystal layer 30 and a second cured liquid crystal layer 31, examples of the combination of the first cured liquid crystal layer 30 and the second cured liquid crystal layer 31 include a combination of a λ / 2 retardation layer and a λ / 4 retardation layer, and a combination of a λ / 4 retardation layer and a positive C layer.

[0147] The optical laminate of the present invention may be configured as a circular polarizer having a λ / 4 retardation layer, and the circular polarizer can be used as an anti-reflection polarizer.

[0148] [Alignment layer] The alignment layer has an alignment control force that aligns the liquid crystal compound contained in the liquid crystal cured layer formed on the alignment layer in a desired direction. Examples of the alignment layer include an alignment polymer layer formed from an alignment polymer, a photo-aligned polymer layer formed from a photo-aligned polymer, and a groove alignment layer having a concavo-convex pattern or multiple grooves on the layer surface. The thickness of the alignment layer is usually 0.01 to 10 μm, and preferably 0.01 to 5 μm.

[0149] The oriented polymer layer can be formed by applying a composition in which an oriented polymer is dissolved in a solvent to a substrate layer, removing the solvent, and optionally performing a rubbing treatment. In this case, the orientation control force of the oriented polymer layer formed from the oriented polymer can be adjusted arbitrarily by changing the surface condition of the oriented polymer and the rubbing conditions.

[0150] The photo-aligned polymer layer can be formed by applying a composition containing a polymer or monomer having a photoreactive group and a solvent to a substrate layer and irradiating the composition with polarized light. In this case, the alignment control force of the photo-aligned polymer layer can be adjusted arbitrarily by, for example, irradiating the photo-aligned polymer with polarized light.

[0151] The groove alignment layer can be formed by, for example, a method of forming a concave-convex pattern by exposing the surface of a photosensitive polyimide film through an exposure mask having slits in a pattern shape, developing, etc., or by forming an uncured layer of active energy ray-curable resin on a plate-shaped master having grooves on its surface, transferring this layer to a base layer, and curing the layer; or by forming an uncured layer of active energy ray-curable resin on a base layer, and pressing a roll-shaped master having concave-convex shapes against this layer to form concave-convex shapes and then curing the layer.

[0152] The substrate layer is preferably a film formed of a resin material. Examples of the resin material include resin materials excellent in transparency, mechanical strength, thermal stability, and stretchability. Specific examples include polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene-based polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth)acrylic acid resins such as (meth)acrylic acid and polymethyl(meth)acrylate; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; polycarbonate resins; polystyrene resins; polyarylate resins; polysulfone resins; polyethersulfone resins; polyamide resins; polyimide resins; polyetherketone resins; and polyphenylene sulfide. Examples of suitable resins include olefin-based resins; polyphenylene oxide-based resins, and mixtures and copolymers thereof. Among these resins, it is preferable to use any one of cyclic polyolefin-based resins, polyester-based resins, cellulose ester-based resins, and (meth)acrylic acid-based resins, or mixtures thereof. The term "(meth)acrylic acid" used above means "at least one of acrylic acid and methacrylic acid."

[0153] The substrate layer may be a single layer made of one or a mixture of two or more of the above resins, or may have a multi-layer structure of two or more layers, in which the resins constituting each layer may be the same or different.

[0154] Any additives may be added to the resin material forming the resin film, such as a selective light absorber, an antioxidant, a lubricant, a plasticizer, a release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a colorant.

[0155] The thickness of the base layer is not particularly limited, but in general, from the viewpoint of workability such as strength and handling, it is preferably 5 to 200 μm, more preferably 10 to 200 μm, and even more preferably 10 to 150 μm.

[0156] In order to improve the adhesion between the substrate layer and the alignment layer, at least the surface of the substrate layer on which the alignment layer is formed may be subjected to corona treatment, plasma treatment, flame treatment, etc., or a primer layer, etc. may be formed. From a layer structure consisting of substrate layer / alignment layer / cured liquid crystal layer, the substrate layer may be peeled off and the alignment layer / cured liquid crystal layer may be used as components of the intermediate layer of the present invention, or the substrate layer / alignment layer may be peeled off and the cured liquid crystal layer may be used as components of the intermediate layer of the present invention.

[0157] [Lamination layer] The intermediate layer 300 may include a bonding layer for bonding two layers together. Examples of the bonding layer include an adhesive layer and a pressure-sensitive adhesive layer (hereinafter also referred to as a "second pressure-sensitive adhesive layer"). The optical laminate 101 shown in Fig. 2 includes an adhesive layer 33 interposed between the first liquid crystal cured layer 30 and the second liquid crystal cured layer 31 to bond them together, and a second pressure-sensitive adhesive layer 32 laminated on the surface of the first liquid crystal cured layer 30 opposite to the adhesive layer 33.

[0158] The adhesive layer may be a water-based adhesive, an active energy ray-curable adhesive, a thermosetting adhesive, etc. The thickness of the adhesive layer is, for example, 10 nm to 20 μm, preferably 100 nm to 10 μm, and more preferably 500 nm to 5 μm.

[0159] The second pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition similar to the pressure-sensitive adhesive composition forming the above-mentioned photoselective absorption pressure-sensitive adhesive layer, or may be composed of a pressure-sensitive adhesive composition (hereinafter also referred to as "second pressure-sensitive adhesive composition") whose main component is a resin such as a (meth)acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resin. The second pressure-sensitive adhesive composition is preferably a pressure-sensitive adhesive composition whose base polymer is a (meth)acrylic resin, which is excellent in transparency, weather resistance, heat resistance, etc. The second pressure-sensitive adhesive composition may be an active energy ray-curable or thermosetting type. The thickness of the second pressure-sensitive adhesive layer is typically 0.1 μm or more and 150 μm or less, for example 8 μm or more and 60 μm or less. From the viewpoint of thinning, it is preferably 30 μm or less, and more preferably 20 μm or less.

[0160] In order to prevent discoloration in the polarizer 10, it is preferable that the second adhesive layer does not contain a light-selective absorber, and if it contains a light-selective absorber, it is preferable that the amount of the light-selective absorber per unit area be 0.5 parts by mass or less per 100 parts by mass of the total resin components.

[0161] <Method of manufacturing optical laminate> The optical laminates 100, 101, and 102 can be produced by a method including a step of bonding constituent layers together via a bonding layer. The method may also include a step of peeling off layers that are not constituent layers. When bonding layers together via a bonding layer, it is preferable to perform a surface activation treatment, such as a corona treatment, on one or both of the bonding surfaces to improve adhesion.

[0162] <Optical laminate> The optical layered body of the present invention is planar and has an area of, for example, 30 mm×30 mm to 180 mm×90 mm. The optical laminate of the present invention may be rectangular, such as a rectangle or a square, or may have a so-called irregular shape, such as a shape having a notch in which part of the side constituting the rectangle is cut out, a semicircular shape, or a shape having a through hole in the plane. When the external shape of the optical laminate has straight sides, the absorption axis of the polarizer constituting the optical laminate may be parallel to the sides, perpendicular to the sides, or diagonally, for example, at an angle of 45°. When the optical laminate has a retardation layer and this retardation layer has a slow axis in the plane, this slow axis may intersect with the absorption axis of the polarizer that constitutes the optical laminate at an angle of 45°, 15°, or 75°.

[0163] <Image display device> The optical laminates 100, 101, and 102 are arranged on the front surface (viewing side) of an image display panel and can be used as components of an image display device. The optical laminate, which is a circular polarizer, can also be used as an anti-reflection polarizer that imparts anti-reflection function to an image display device. The image display device is not particularly limited, and examples thereof include organic electroluminescence (organic EL) display devices, inorganic electroluminescence (inorganic EL) display devices, liquid crystal display devices, and electroluminescence display devices. [Example]

[0164] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these. "%" and "parts" in the examples and comparative examples are "% by mass" and "parts by mass" unless otherwise specified.

[0165] [Preparation of single-sided protected polarizing plate] (Fabrication of polarizer) A polyvinyl alcohol film with a thickness of 20 μm, a degree of polymerization of 2400, and a degree of saponification of 99% or more was uniaxially stretched to a stretching ratio of 4.1 times on a heated roll, and while maintaining tension, it was immersed for 60 seconds at 28°C in a dye bath containing 0.05 parts by weight of iodine and 5 parts by weight of potassium iodide per 100 parts by weight of water.

[0166] The film was then immersed in boric acid aqueous solution 1, which contained 5.5 parts by weight of boric acid and 15 parts by weight of potassium iodide per 100 parts by weight of water, at 64°C for 110 seconds. The film was then immersed in boric acid aqueous solution 2, which contained 5.5 parts by weight of boric acid and 15 parts by weight of potassium iodide per 100 parts by weight of water, at 67°C for 30 seconds. The film was then washed with pure water at 10°C and dried to obtain a polarizer. The resulting polarizer had a thickness of 8 μm and a boron content of 4.3 wt%.

[0167] (Adjustment of water-based adhesive) In 100 parts by weight of water, 3 parts by weight of carboxyl group-modified polyvinyl alcohol (Kuraray Co., Ltd., trade name "KL-318") was dissolved, and 1.5 parts by weight of a polyamide epoxy additive, which is a water-soluble epoxy resin (Taoka Chemical Co., Ltd., trade name "Sumirez Resin (registered trademark) 650 (30)", an aqueous solution with a solid content of 30% by weight), was added to the aqueous solution to form a water-based adhesive. The adhesive was prepared.

[0168] (Protective film A and release film B) As the protective film A, a film (manufactured by Nippon Paper Industries Co., Ltd., product name "COP25ST-HC") was used, in which a hard coat layer having a thickness of 3 μm was formed on a stretched film made of a norbornene-based resin having a thickness of 25 μm. A triacetyl cellulose film (manufactured by Fujifilm Corporation, "TD80UL") was used as release film B. The release film had a thickness of 80 μm and a moisture permeability of 502 g / m 2 It was 24 hours.

[0169] (Preparation of single-sided protective polarizing plate) The prepared polarizer was continuously transported, while Protective Film A was continuously unwound from its roll, and Release Film B was continuously unwound from its roll. An aqueous adhesive was injected between the polarizer and the corona-treated Protective Film A, and pure water was injected between the polarizer and Release Film B. The film was then passed through a lamination roll to obtain a laminated film consisting of Protective Film A / Aqueous Adhesive / Polarizer / Pure Water / Release Film B. The laminated film was transported and heated in a drying oven at 80°C for 300 seconds to dry the aqueous adhesive and volatilize and remove the pure water between the polarizer and Release Film B, yielding a single-sided protected polarizing plate with a release film. Release Film B was then peeled off from the single-sided protected polarizing plate with a release film to obtain a single-sided protected polarizing plate.

[0170] [Preparation of retardation laminate] (Preparation of "Alignment layer / First liquid crystal curing layer") A λ / 4 retardation layer (first liquid crystal cured layer) was prepared, which was an alignment layer and a layer of cured nematic liquid crystal compound formed on a substrate film. The total thickness of the "alignment layer / first liquid crystal cured layer" was 2 μm.

[0171] (Fabrication of "Alignment layer / second liquid crystal cured layer") As a composition for forming the alignment layer, 10.0 parts by mass of polyethylene glycol di(meth)acrylate (A-600, manufactured by Shin-Nakamura Chemical Co., Ltd.), 10.0 parts by mass of trimethylolpropane triacrylate (A-TMPT, manufactured by Shin-Nakamura Chemical Co., Ltd.), 10.0 parts by mass of 1,6-hexanediol di(meth)acrylate (A-HD-N, manufactured by Shin-Nakamura Chemical Co., Ltd.), and 1.50 parts by mass of Irgacure 907 (Irg-907, manufactured by BASF) as a photopolymerization initiator were dissolved in 70.0 parts by mass of methyl ethyl ketone solvent to prepare a coating liquid for forming the alignment layer.

[0172] A 20 μm thick long cyclic olefin resin (COP) film (manufactured by Zeon Corporation) was prepared as a substrate film, and the coating liquid for forming an alignment layer was applied to one side of the substrate film using a bar coater.

[0173] After the coating, the coating layer was heat treated at 80°C for 60 seconds, and then exposed to ultraviolet light (UVB) at 220 mJ / cm 2 The composition for forming the alignment layer was polymerized and cured by irradiation, forming an alignment layer having a thickness of 2.3 μm on the substrate film.

[0174] As a composition for forming the retardation layer, 20.0 parts by mass of a photopolymerizable nematic liquid crystal compound (RMM28B, manufactured by Merck) and 1.0 part by mass of Irgacure 907 (Irg-907, manufactured by BASF) as a photopolymerization initiator were dissolved in 80.0 parts by mass of propylene glycol monomethyl ether acetate solvent to prepare a coating liquid for forming the retardation layer.

[0175] The retardation layer forming coating liquid is applied onto the previously obtained alignment layer, and the coating layer is heated at 80°C for 60 seconds. After that, ultraviolet rays (UVB) were irradiated at 220 mJ / cm 2 The retardation layer was polymerized and cured by irradiation to form a retardation layer (cured second liquid crystal layer) having a thickness of 0.7 μm on the alignment layer. In this way, an "alignment layer / cured second liquid crystal layer" having a total thickness of 3 μm was obtained on the substrate film.

[0176] (Preparation of Retardation Laminate) The "alignment layer / first liquid crystal cured layer" laminated on the substrate film and the "alignment layer / second liquid crystal cured layer" laminated on the substrate film were bonded together using a UV-curable adhesive (thickness 1 μm) so that the surfaces of the respective liquid crystal cured layers (the surfaces opposite to the substrate film) became the bonding surfaces. Next, the UV-curable adhesive was cured by irradiating it with UV light to produce a retardation laminate including two liquid crystal cured layers, the first liquid crystal cured layer and the second liquid crystal cured layer.

[0177] [Preparation of photoselective absorption adhesive layer] <Adhesive layer (1)> (Synthesis of photoselective absorbing monomers) A 300 mL four-neck flask equipped with a Dimroth condenser and a thermometer was placed under a nitrogen atmosphere and charged with 10 parts of 2-hydroxyethyl acrylate, 8.1 parts of cyanoacetic acid, 1.1 parts of N,N-dimethyl-4-aminopyridine, 0.95 parts of dibutylhydroxytoluene, and 50 parts of toluene, followed by stirring with a magnetic stirrer. After cooling in an ice bath and confirming that the internal temperature had reached 10°C, 12 parts of N,N-diisopropylcarbodiimide were added dropwise over 1 hour. After completion of the addition, the internal temperature was maintained at 0-10°C for an additional 2 hours. The insoluble components were then removed by vacuum filtration, yielding 70 parts of a filtrate containing the compound represented by UVA-M-02. [ka]

[0178] A 300 mL four-neck flask equipped with a Dimroth condenser and a thermometer was filled with nitrogen and charged with 20 parts of a compound designated UVA-M-01 synthesized with reference to JP 2014-194508 A, 7.1 parts of acetic anhydride, 70 parts of a filtrate containing UVA-M-02, and 40 parts of acetonitrile, followed by stirring with a magnetic stirrer. At an internal temperature of 25°C, 9 parts of N,N-diisopropylethylamine were added dropwise to the resulting mixture over 1 hour. The resulting mixture was kept at an internal temperature of 25°C for 2 hours. 200 g of ice water was added to the resulting mixture and stirred, and the precipitated product was collected by vacuum filtration. The resulting crude product was recrystallized with isopropanol to obtain 10 parts of a compound designated UVA-01. The resulting compound designated UVA-01 was analyzed by LC-MS and 1 Identification was performed using H-NMR. [ka]

[0179] (Preparation of Photoselective Absorbing Polymer (A-1)) Into a reaction vessel equipped with a condenser, a nitrogen inlet tube, a thermometer, and a stirrer, 96 parts by mass of butyl acrylate (referred to as "BA" in Table 1), 2-hydroxyethyl acrylate (referred to as "BA" in Table 1), and Three parts by weight of UVA-01 (referred to as "HEA") and 1 part by weight of a photoselective absorbing monomer designated UVA-01 (total solids: 100 parts by weight) were mixed with 135 parts by weight of ethyl acetate as a solvent. The air in the reactor was purged with nitrogen gas to remove oxygen, and the internal temperature was raised to 60°C. A solution of 0.4 parts of azobisisobutyronitrile (polymerization initiator) in 10 parts of ethyl acetate was added to the resulting mixture. The resulting mixture was held at 60°C for 1 hour, and then ethyl acetate was continuously added to the reactor at a rate of 17.3 parts / hour while maintaining the internal temperature at 50-70°C. When the acrylic resin concentration reached 35%, the ethyl acetate addition was stopped. The internal temperature was maintained at 50-70°C for 12 hours. Ethyl acetate was added to the resulting photoselective absorbing polymer (A-1) mixture to adjust the resin component concentration to 20%, thereby preparing an ethyl acetate solution of the photoselective absorbing polymer (A-1). The photoselective absorbing polymer (A-1) had a weight average molecular weight Mw of 500,000 in terms of polystyrene measured by GPC, and an Mw / Mn of 7.5. The glass transition temperature measured by DSC was −48.4° C.

[0180] (Preparation of Pressure-Sensitive Adhesive Composition and Pressure-Sensitive Adhesive Layer) (a) Preparation of Pressure-Sensitive Adhesive Composition An ethyl acetate solution of the photoselective absorbing polymer (A-1) (resin concentration: 20%) was mixed with 0.5 parts of a crosslinker (Coronate L, solids content 75%: manufactured by Tosoh) and 0.5 parts of a silane compound (KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd.) per 100 parts of the solids content of the solution, and 2-butanone was added to give a solids concentration of 14%, to obtain a pressure-sensitive adhesive composition (1). The amount of the crosslinker (Coronate L) is expressed in parts by mass as the active ingredient.

[0181] (b) Preparation of adhesive layer The pressure-sensitive adhesive composition prepared in (a) above was applied to the release-treated surface of a release-treated polyethylene terephthalate film (SP-PLR382050 manufactured by Lintec Corporation, hereinafter abbreviated as "separator") using an applicator so that the thickness of the pressure-sensitive adhesive layer after drying would be 17 μm, and the resulting layer was dried at 100° C. for 1 minute to prepare a pressure-sensitive adhesive layer. The resulting pressure-sensitive adhesive layer was designated pressure-sensitive adhesive layer (1).

[0182] <Adhesive layer (2)> (Preparation of acrylic resin (A-2)) A reaction vessel equipped with a condenser, nitrogen inlet, thermometer, and stirrer was charged with a mixture of 61.9 parts butyl acrylate, 1.9 parts 2-hydroxyethyl acrylate, and 135 parts ethyl acetate as a solvent. The air in the vessel was purged with nitrogen gas to remove oxygen, and the internal temperature was raised to 60°C. A solution of 0.4 parts azobisisobutyronitrile (polymerization initiator) in 10 parts ethyl acetate was then added in its entirety. The resulting mixture was held at 60°C for 1 hour, and then ethyl acetate was continuously added to the reaction vessel at a rate of 17.3 parts / hr while maintaining the internal temperature at 50-70°C. When the acrylic resin concentration reached 35%, the ethyl acetate addition was stopped. The mixture was then maintained at this temperature for 12 hours. Finally, ethyl acetate was added to adjust the acrylic resin concentration to 20%, preparing an acrylic resin-ethyl acetate solution. The resulting acrylic resin had a weight-average molecular weight (Mw) of 600,000 (as measured by GPC) in terms of polystyrene, and an Mw / Mn ratio of 7.0. This was designated acrylic resin (A-2). The glass transition temperature measured by DSC was −52.9°C.

[0183] (Preparation of Pressure-Sensitive Adhesive Composition and Pressure-Sensitive Adhesive Layer) (a) Preparation of Pressure-Sensitive Adhesive Composition To an ethyl acetate solution of acrylic resin (A-2) (resin concentration: 20%), 0.5 parts of a crosslinker (Coronate L, solid content 75%: manufactured by Tosoh Corporation), 0.5 parts of a silane compound (KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd.), and a compound described as a light-selective absorbing compound (2) in Synthesis Example 2 described in paragraph

[0142] of JP-A-2019-007001 were added relative to 100 parts of the solid content of the solution. 2.5 parts of a compound (light-selective absorber) represented by the following formula (aa2) was mixed, and 2-butanone was added to give a solids concentration of 14%, to obtain a pressure-sensitive adhesive composition (2). The amount of the crosslinking agent (Coronate L) is expressed in parts by mass as the active ingredient. [ka]

[0184] (b) Preparation of adhesive layer An adhesive layer (2) was produced from the adhesive composition in the same manner as in the adhesive layer (1).

[0185] [Preparation of second adhesive layer] An ethyl acetate solution of the acrylic resin (A-2) (resin concentration: 20%) was mixed with 0.5 parts of a crosslinker (Coronate L, solids content 75%: manufactured by Tosoh) and 0.5 parts of a silane compound (KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd.), and 2-butanone was added to adjust the solids content to 14%, to obtain a pressure-sensitive adhesive composition. The amount of the crosslinker (Coronate L) is expressed in parts by mass as the active ingredient.

[0186] The adhesive composition was applied to the release-treated surface of the separator used to prepare the photoselectively absorbing adhesive layer using an applicator so that the adhesive layer would have a thickness of 5 μm after drying, and then dried at 100°C for 1 minute to prepare a second adhesive layer.

[0187] [Preparation of optical laminate] (Example 1, Comparative Example 1) A second pressure-sensitive adhesive layer was attached to the polarizer side of the prepared single-sided protected polarizing plate, and the separator was peeled off. The surface of the prepared retardation laminate, exposed by peeling off the substrate film on the first liquid crystal cured layer side, was attached to the surface from which the separator had been peeled off of the second pressure-sensitive adhesive layer. The substrate film on the second liquid crystal cured layer side was then peeled off, and a pressure-sensitive adhesive layer listed in Table 1 was attached as a photoselectively absorbing pressure-sensitive adhesive layer to the surface of the alignment layer on the second liquid crystal cured layer side, to obtain an optical laminate with a layer structure of "protective film A / water-based adhesive / polarizer / second pressure-sensitive adhesive layer / alignment layer / first liquid crystal cured layer / second liquid crystal cured layer / alignment layer / photoselectively absorbing pressure-sensitive adhesive layer / separator." In this optical laminate, the intermediate layer had a layer structure of "second pressure-sensitive adhesive layer / alignment layer / first liquid crystal cured layer / ultraviolet-curable adhesive layer / second liquid crystal cured layer / alignment layer," and the total thickness was 11 μm. The optical laminates of Example 1 and Comparative Example 1 had the structure shown in FIG. 2.

[0188] In the above, the adhesive layer was applied using an applicator to a thickness of 5 μm, and dried at 100°C for 1 minute to prepare a second adhesive layer. The total thickness of the "alignment layer / first liquid crystal cured layer" was 2 μm. The total thickness of the "alignment layer / second liquid crystal cured layer" was 3 μm. The thickness of the ultraviolet-curable adhesive was 1 μm.

[0189] (Example 2, Comparative Example 2) A second pressure-sensitive adhesive layer was attached to the polarizer side of the prepared single-sided protected polarizing plate, and the separator was peeled off. A pressure-sensitive adhesive layer described in Table 1 was attached as a light-selective absorbing pressure-sensitive adhesive layer to the surface of the second pressure-sensitive adhesive layer from which the separator had been peeled off, to obtain an optical laminate having a layer structure of "protective film A / water-based adhesive / polarizer / second pressure-sensitive adhesive layer / light-selective absorbing pressure-sensitive adhesive layer / separator." In this optical laminate, the intermediate layer consisted of the "second pressure-sensitive adhesive layer," and its thickness was 5 μm. Example 2 and Comparative Example The optical laminate of Example 2 had a configuration as shown in FIG.

[0190] In the above, the adhesive layer was applied using an applicator so as to have a thickness of 5 μm, and dried at 100° C. for 1 minute to prepare a second adhesive layer.

[0191] [Measurement of absorbance of adhesive layer] The pressure-sensitive adhesive layers (1) and (2) were each attached to glass, and the separator was peeled off. A cycloolefin polymer (COP) film (ZF-14, manufactured by Zeon Corporation) was then attached to the pressure-sensitive adhesive layer to prepare a laminate for pressure-sensitive adhesive layer evaluation. The laminate for pressure-sensitive adhesive layer evaluation was placed in a UV-2450 spectrophotometer (manufactured by Shimadzu Corporation), and absorbance was measured in 1-nm steps over a wavelength range of 300 to 800 nm. The absorbance at a wavelength of 410 nm of the prepared pressure-sensitive adhesive layer is shown in Table 1. The absorbance of both the glass and the COP film at a wavelength of 410 nm was zero.

[0192] [Measurement of weight average molecular weight (Mw)] The weight-average molecular weight (Mw) of the photoselective absorbing polymer (A-1) and the acrylic resin (A-2) was determined as the polystyrene-equivalent number-average molecular weight (Mn) by size exclusion chromatography (SEC) using tetrahydrofuran as the mobile phase. The (meth)acrylic polymer to be measured was dissolved in tetrahydrofuran at a concentration of approximately 0.05% by mass, and 10 μL was injected into the SEC. The mobile phase was run at a flow rate of 1.0 mL / min. The column used was a PLgel MIXED-B (manufactured by Polymer Laboratories). The detector used was a UV-VIS detector (trade name: Agilent GPC).

[0193] [Boron content measurement] 0.2 g of polarizer was dissolved in 200 g of 1.9 wt% mannitol aqueous solution. The resulting solution was titrated with 1 mol / L NaOH aqueous solution, and the boron content of the polarizer was calculated by comparing the amount of NaOH solution required for neutralization with the calibration curve.

[0194] [Moisture and heat resistance test and color fading observation] The separators of the optical laminates obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were peeled off, and the laminates were attached to alkali-free glass plates. The laminates were then left for 500 hours in an environment at a temperature of 65°C and a humidity of 90% RH. A polarizing plate was then attached to the alkali-free glass surface opposite the tested optical laminate in a crossed-Nicol relationship. The laminates were then observed using an optical microscope, and the observed images were saved. The optical microscope used was a "VHX-500" manufactured by Keyence Corporation. Figure 4 shows an example of an image observed using the optical microscope. In Figure 4, when the optical laminate was observed from the edge 50 of the optical laminate inward along the line indicated by the arrow (the line extending perpendicularly from the edge 50), it was found that there was a decolorized region 51 and a region where decolorization had not occurred (non-decolorized region) 52.

[0195] [Measurement of color loss using image processing] The images observed under the microscope were converted to black and white in 256 gradations (0-255) using the image analysis software "ImageJ (free software)." The conversion to black and white in 256 gradations (0-255) was performed by averaging the RGB values. Figure 5 shows an example of the converted data. The midpoint (the middle of the decolorization gradation) between the decolorized region 51 and the non-decolorized region 52 in the gradation profile in the direction perpendicular to the edge 50 of the optical laminate (arrow in Figure 4) was defined as the decolorized edge of the optical laminate (Figure 5), and the distance (μm) from the edge 50 of the optical laminate to the decolorized edge was measured as the decolorization distance. The decolorization distance of the optical laminate is shown in Table 1. The smaller the decolorization distance, the narrower the decolorization range and the better the humidity and heat resistance.

[0196] The color loss distances of optical laminates having the same layer structure (Example 1 and Comparative Example 1, Example 2 and Comparative Example 2) were compared, and the difference and the improvement rate of the color loss distance ((absolute value of the difference / color loss distance of Comparative Examples 1 and 2) The distance (mm) × 100) is shown in Table 1.

[0197] [Table 1] [Explanation of symbols]

[0198] 10 polarizer, 11 protective film, 20 light-selective absorbing adhesive layer, 30 first liquid crystal cured layer, 31 second liquid crystal cured layer, 32 second adhesive layer, 33 adhesive layer, 50 edge of optical laminate, 51 color-bleached region, 52 non-color-bleached region, 100, 101, 102 optical laminate, 300 intermediate layer.

Claims

1. An optical laminate comprising a polarizer, a light-selective absorbing pressure-sensitive adhesive layer, and an intermediate layer laminated between the polarizer and the light-selective absorbing pressure-sensitive adhesive layer in contact with them, the intermediate layer has only one or more layers selected from the group consisting of a liquid crystal curing layer, an alignment layer, and an attachment layer; the polarizer has iodine adsorbed and oriented, and a boron content of 5.0 mass% or less; An optical laminate, wherein the pressure-sensitive adhesive composition forming the photoselective absorbing pressure-sensitive adhesive layer contains a photoselective absorbing polymer.

2. The optical laminate according to claim 1 , further comprising a protective film laminated on the polarizer on the side opposite to the intermediate layer side.

3. The photoselective absorption polymer has the following chemical formula (1): >NC=CC=C< (1) [However, one N atom and all four C atoms constituting the chemical formula (1) do not constitute a part or the whole of an aromatic heterocycle.] 3. The optical laminate according to claim 1, wherein the resin contains a structural unit having a structure represented by the formula: and has a glass transition temperature of 40°C or lower.

4. The optical laminate according to claim 3, wherein the content of the structural unit having the structure represented by chemical formula (1) relative to 100 parts by mass of all structural units in the photoselective absorbing polymer is 0.01 parts by mass or more and 50 parts by mass or less.

5. 5. The optical laminate according to claim 1, wherein the photoselective absorbing polymer has a weight average molecular weight of 300,000 or more.

6. The pressure-sensitive adhesive composition does not contain a light-selective absorber, or the content of the light-selective absorber is 0.5 parts by mass or less per 100 parts by mass of the total resin component. The optical laminate according to any one of claims 1 to 5.

7. The optical laminate according to any one of claims 1 to 6, wherein the intermediate layer has a λ / 4 retardation layer that is the liquid crystal cured layer.

8. The optical laminate according to any one of claims 1 to 7, which is an anti-reflection polarizing plate.

9. An image display device comprising: an image display panel; and the optical laminate according to claim 8 arranged in front of the image display panel.

10. The image display device according to claim 9, which is an organic EL display device.

Images