JP2021099480A - Optical laminate and image display device - Google Patents

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 100 provided herein comprises a polarizer 10, a selective light absorbing adhesive layer 20, and an intermediate layer 300 laminated between the polarizer and the selective light absorbing adhesive layer in contact therewith. The intermediate layer has 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. The selective light absorbing adhesive layer contains a selective light absorber, and exhibits an absorbance in a range of 0.1 to 2.3, inclusive, at a wavelength of 410 nm.SELECTED DRAWING: Figure 1

Description

The present invention relates to an optical laminate and an image display device.

Polarizing plates made by laminating and laminating a protective film on one or both sides of a polarizer are used for image display devices such as liquid crystal display devices such as mobile televisions and organic electroluminescence (organic EL) display devices, especially in recent years. It is an optical member widely used in various mobile devices such as telephones, smartphones, and tablet terminals.
The polarizing plate is often used by being bonded to an image display element (liquid crystal cell, organic EL display element, etc.) via an adhesive layer (for example, Japanese Patent Application Laid-Open No. 2010-229321 (Patent Document 1)). Therefore, the polarizing plate may be marketed in the form of a polarizing plate with an adhesive layer in which an adhesive layer is previously provided on one surface of the polarizing plate.

In addition, mobile devices are often used in harsh environments of high temperature and high humidity, and high durability is required as a polarizer. The JP 2013-105036 (Patent Document 2), by increasing the boric acid content in the polarizer, by generating many borate crosslinked, present in high stability I ₃ complex is highly oriented It is described that the occurrence of blue leak is suppressed and a polarizer having excellent low-temperature and high-humidity durability can be obtained.

Japanese Unexamined Patent Publication No. 2010-229321 Japanese Unexamined Patent Publication No. 2013-105036

The polarizing plate has a problem that color loss is likely to occur at the end of the polarizer in a high temperature and high humidity environment. Such a problem was remarkable in the configuration in which the protective film was laminated and laminated on only one side of the polarizer. Although a method of suppressing color loss of the polarizer by increasing the boron content in the polarizer is known, there is a problem that the method tends to shrink due to heating.

An object of the present invention is to provide a novel optical laminate in which color loss is suppressed at an end portion of a polarizer under high temperature and high humidity.

The present invention provides an optical laminate illustrated below and an image display device using the same.
[1] An optical laminate having a polarizer, a light-selective-absorbing pressure-sensitive adhesive layer, and an intermediate layer laminated in contact with the polarizer and the light-selective-absorbing pressure-sensitive adhesive layer. hand,
The intermediate layer has only one or more layers selected from the group consisting of a liquid crystal cured layer, an oriented layer, and a bonded layer.
Iodine is adsorbed and oriented in the polarizer, and the boron content is 5.0% by mass or less.
The light selective absorption pressure-sensitive adhesive layer is an optical laminate containing a light selective absorption agent and having an absorbance at a wavelength of 410 nm of 0.1 or more and 2.3 or less.
[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 light selective absorbing pressure-sensitive adhesive layer has a content of the light selective absorbing agent per unit area of 0.01 g / m ² or more and 5 g / m ² or less, according to [1] or [2]. Optical laminate.
[4] The light selective absorbing pressure-sensitive adhesive layer contains 0.1 part by mass or more and 10 parts by mass or less of the light selective absorbing agent with respect to 100 parts by mass of all resin components contained in the light selective absorbing pressure-sensitive adhesive layer. , The optical laminate according to any one of [1] to [3].
[5] The optical laminate according to any one of [1] to [4], wherein the light selective absorbing pressure-sensitive adhesive layer has a thickness of 0.1 μm or more and 150 μm or less.
[6] The optical laminate according to any one of [1] to [5], wherein the light selective absorber is an organic light selective absorber having a molecular weight of 100 or more and 3000 or less.
[7] The optical laminate according to any one of [1] to [6], wherein the intermediate layer has a λ / 4 retardation layer which is the liquid crystal curing layer.
[8] The optical laminate according to any one of [1] to [7], which is an antireflection polarizing plate.
[9] An image display device including 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], wherein the image display panel is an organic EL display panel.

According to the present invention, it is possible to provide an optical laminate in which color loss is suppressed at an end portion of a polarizer in a high temperature and high humidity environment, and an image display device including the same.

It is the schematic sectional drawing which shows an example of the optical laminated body of this invention. It is the schematic sectional drawing which shows an example of the optical laminated body of this invention. It is the schematic sectional drawing which shows an example of the optical laminated body of this invention. It is a figure which shows an example of the observation image with an optical microscope. It is a figure which shows an example of the data which converted the observation image into black-and-white 256 gradations.

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 the drawings below, the scale is appropriately adjusted to make it easier to understand each component, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.

<Optical laminate>
The optical laminate of the present invention has a polarizer, a light-selective-absorbing pressure-sensitive adhesive layer, and an intermediate layer laminated in contact with the polarizer and the light-selective-absorbing pressure-sensitive adhesive layer. .. An example of the layer structure of the optical laminate of the present invention is shown in FIGS. 1, 2, and 3.
FIG. 1 is a schematic cross-sectional view of an example of the optical laminate of the present invention. In the optical laminate 100 shown in FIG. 1, a protective film 11, a polarizing element 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 are arranged in this order. Have. The intermediate layer 300 has only one or a plurality of layers selected from the group consisting of a liquid crystal cured layer, an oriented layer, and a bonded layer.

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 a protective film 11, a polarizer 10, an intermediate layer 300, and a light selective absorbing pressure-sensitive adhesive layer 20 in this order. The intermediate layer 300 has a second pressure-sensitive adhesive layer 32, a first liquid crystal curing layer 30, an adhesive layer 33, and a second liquid crystal curing layer 31 in this order from the polarizer 10 side.

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 a protective film 11, a polarizer 10, an intermediate layer 300, and a light selective absorbing pressure-sensitive adhesive layer 20 in this order. The intermediate layer 300 is composed of a second pressure-sensitive adhesive layer 32.

The thicknesses of the optical laminates 100, 101, and 102 are not particularly limited because they differ depending on the functions required of the optical laminate, the application of the optical laminate, and the like, but are, for example, 5 μm or more and 200 μm or less, and 10 μm or more and 150 μm or less. It may be 120 μm or less.

The light selective absorbing pressure-sensitive adhesive layer contains a light selective absorbing agent. In the optical laminate of the present invention, at least the light selective absorption pressure-sensitive adhesive layer has light selective absorption performance, so that the optical laminate as a whole also has light selective absorption performance. Therefore, the optical laminate of the present invention has a function of protecting the image display element from ultraviolet rays when used on the image display element.

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 absorption pressure-sensitive adhesive layer. Examples of the other layer include a protective film 11 and an intermediate layer 300. In the present invention, the light selective absorption adhesive layer has the light selective absorption performance and contributes to the development of the light selective absorption performance of the entire optical laminate, so that the light selective absorption performance of the other layers can be improved. The degree of design freedom can be improved. For example, the protective film 11 may need to be designed to be thicker in order to improve the light selective absorption performance, but the protective film 11 has a high degree of freedom in designing the light selective absorption performance. It becomes easy to make a thin film. For example, from the viewpoint of suppressing color loss at the end of the polarizer under high temperature and high humidity, the intermediate layer 300 preferably contains substantially no light selective absorber, and even if it does. The amount is preferably 0.5 g / m ² or less. When the intermediate layer 300 has the second pressure-sensitive adhesive layer, it is preferable that the second pressure-sensitive adhesive layer also contains substantially no light selective absorber, and even if it does, the content thereof is 0. It is preferably 5 g / m ^{2 or less.}

The present inventors have found that there is a correlation between the content of the light selective absorber contained in the pressure-sensitive adhesive layer and the degree of color loss at the end of the polarizer under high temperature and high humidity. .. Based on this finding, it is considered that the light selective absorber in the light selective absorption pressure-sensitive adhesive layer easily migrates to the polarizer side under high temperature and high humidity, and such migration is one of the factors causing color loss. Be done. The present inventors have conducted further diligent studies, and even when the light selective absorption pressure-sensitive adhesive layer contains a light selective absorption agent, by adjusting the stacking position and absorbance of the light selective absorption pressure-sensitive adhesive layer, the present inventors have conducted further diligent studies. We have found that it is possible to suppress color loss at the end of the polarizer under high temperature and high humidity, and have arrived at the present invention.

[Polarizer]
The polarizer has a property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis). The polarizer 10 in the optical laminate of the present invention has iodine adsorbed and oriented, and has a boron content of 5.0% by mass or less. With a structure in which the boron content is 5.0% by mass or less, preferably 4.5% by mass or less, shrinkage caused by heating can be suppressed. The content of boron is preferably 0.5% by mass or more, and more preferably 1% by mass or more. In the polarizer 10, the smaller the boron content, the more likely it is that color loss will occur at the ends of the polarizer under high temperature and high humidity. Boron in the polarizer 10 improves the degree of cross-linking of the polarizer 10 and contributes to stably retaining iodine in the polarizer 10. Therefore, when the boron content is low, iodine is stably retained. It is considered that it cannot be held and color loss occurs. In the present invention, even if the boron content of the polarizer 10 is 5.0% by mass or less, color loss under high temperature and high humidity can be suppressed.

Examples of the polarizer 10 include a stretched film or a stretched layer on which a dichroic dye having absorption anisotropy is adsorbed, a cured product of a polymerizable liquid crystal compound, and a liquid crystal cured layer containing a dichroic dye. The dichroic dye refers to a dye having a property in which the absorbance in the major axis direction and the absorbance in the minor axis direction of the molecule are different, and iodine is preferably used as the dye.

(1) A stretched film or a stretched layer in which a dye having absorption anisotropy is adsorbed The polarizer, which is a stretched film in which a dye having absorption anisotropy is adsorbed, is usually a polyvinyl alcohol-based resin film. A step of uniaxial stretching, a step of adsorbing the dichroic dye by dyeing the polyvinyl alcohol-based resin film with a dichroic dye such as iodine, and a step of adsorbing the polyvinyl alcohol-based resin film with boric acid. It can be produced through a step of treating with an aqueous solution and a step of washing with water after treatment with an aqueous boric acid solution.

The thickness of the polarizer is usually 30 μm or less, preferably 15 μm or less, more preferably 13 μm or less, still 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, for example, 5 μm or more.

The polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used. 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. ..

The saponification degree of the polyvinyl alcohol-based resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and polyvinyl formal, polyvinyl acetal, and the like modified with aldehydes can also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.

The polarizer, which is a stretched layer on which a dye having absorption anisotropy is adsorbed, is usually a step of applying a coating liquid containing the above-mentioned polyvinyl alcohol-based resin on a base film, and a step of uniaxially stretching the obtained laminated film. , A step of adsorbing a bicolor dye to form a polarizer by dyeing a polyvinyl alcohol-based resin layer of a uniaxially stretched laminated film with a bicolor dye such as iodine, a film on which the bicolor dye is adsorbed. Can be produced through a step of treating with an aqueous boric acid solution and a step of washing with water after the treatment with the aqueous boric acid solution. The base film used for forming the polarizer may be used as the protective film 11. If necessary, the base film may be peeled off from the polarizer. The material and thickness of the base film may be the same as the material and thickness of the protective film 11 described later.

[Protective film]
The protective film 11 is made of an optically transparent thermoplastic resin such as a cyclic polyolefin resin; a cellulose acetate resin composed of a resin such as triacetyl cellulose or diacetyl cellulose; a resin such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate. Polyester resin; Polycarbonate resin; (meth) acrylic resin; Polypropylene resin, a coating layer or film composed of one or a mixture of two or more of these. The protective film 11 may contain a light selective absorber described later. Since the light selective absorber contained in the protective film 11 is held in the protective film 11, it is unlikely that the light selective absorber will be transferred to the polarizer.

A hard coat layer may be formed on the protective film 11. The hard coat layer may be formed on one surface of the protective film 11 or may be formed on both sides. By providing the hard coat layer, the protective film 11 having improved hardness and scratchability can be obtained. The hard coat layer may be, for example, a cured layer such as 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 additives to improve strength. Additives are not limited and include inorganic fine particles, organic fine particles, or mixtures thereof. The hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, epoxy resin and the like.

The thickness of the protective film is usually 1 to 100 μm, but is preferably 5 to 80 μm, more preferably 8 to 60 μm, and even more preferably 12 to 45 μm from the viewpoint of strength, handleability, and the like.

The resin film, which is the protective film 11, is attached to the polarizer 10 via, for example, an adhesive layer. Examples of the adhesive forming the adhesive layer include a water-based adhesive, an active energy ray-curable adhesive, and a thermosetting adhesive, and a water-based adhesive and an active energy ray-curable adhesive can be used. preferable. The two opposing surfaces bonded via the adhesive layer may be subjected to corona treatment, plasma treatment, flame treatment or the like in advance, or may have a primer layer or the like.

[Light selective absorption adhesive layer]
The light-selective absorbent pressure-sensitive adhesive layer 20 can be formed by applying a diluent in which the pressure-sensitive adhesive composition is dissolved or dispersed in an organic solvent onto a substrate and drying the pressure-sensitive adhesive composition. A plastic film is preferable as the base material, and specific examples thereof include a release film that has been subjected to a mold release treatment. Examples of the release film include those in which one surface of a film made of a resin such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, or polyarylate is subjected to a mold release treatment such as silicone treatment.

The thickness of the light selective absorbing pressure-sensitive adhesive layer is, for example, 0.1 μm or more and 150 μm or less. When laminated with an image display panel, it is usually 8 μm or more and 60 μm or less, and from the viewpoint of thinning, it is preferably 30 μm or less, more preferably 25 μm or less, and particularly preferably 20 μm or less. When laminated with another optical film, for example, a λ / 4 retardation layer, it 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. For example, it may be 10 μm or more, but 10 μm or less, particularly 7 μm or less is preferable in terms of further thinning.

The light selective absorption pressure-sensitive adhesive layer preferably has an absorbance at a wavelength of 410 nm of 0.1 or more and 2.3 or less, and more preferably 0.2 or more and 2.0 or less. This is because the light selective absorption pressure-sensitive adhesive layer 20 having such an absorbance makes it easy to form the entire optical laminate in a thin shape while exhibiting desired light selective absorption performance as the entire optical laminate.

The light-selective absorbent adhesive layer
The absorbance at a wavelength of 390 nm is usually 5.0 or less, and may be 4.5 or less.
The absorbance at a wavelength of 400 nm is usually 5.0 or less, and may be 4.5 or less.
The absorbance at a wavelength of 420 nm is usually 1.00 or less, preferably 0.60 or less, more preferably 0.40 or less, and 0.00 or more.
The absorbance at a wavelength of 430 nm is usually less than 0.20, preferably 0.18 or less, more preferably 0.10 or less, particularly preferably 0.05 or less, 0.00 or more.
The absorbance at a wavelength of 440 nm is usually less than 0.10, preferably 0.05 or less, and 0.00 or more.
When the absorbance at each wavelength is in the above range, the light in the visible light region can be transmitted as it is while sufficiently absorbing the light in the ultraviolet region.

The light selective absorbing pressure-sensitive adhesive layer preferably has a content of the light selective absorbing agent per unit area of 0.01 g / m ² or more and 5 g / m ² or less. Within such a range, it is possible to suppress color loss of the polarizer that occurs under high temperature and high humidity.

In the optical laminate, the light selective absorption pressure-sensitive adhesive layer 20 may be provided on the outermost surface, and the optical laminate may be attached to the adherend via the light selective absorption pressure-sensitive adhesive layer 20.

[Adhesive composition]
The pressure-sensitive adhesive composition contains a resin and a light selective absorber, and preferably contains a cross-linking agent. The resin is a resin whose main component is a resin such as (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether. Among these, a resin containing (meth) acrylic resin (A) as a main component is preferable.

(Light selective absorber)
The light selective absorber selectively absorbs light having a specific wavelength, and preferably contains a compound having at least one absorption maximum at a wavelength of 360 nm to 420 nm, and preferably contains a compound having an absorption maximum at 380 nm to 410 nm. It is more preferable to include it.

Examples of the light selective absorber (hereinafter, may be referred to as a light selective absorber (A)) containing a compound having an absorption maximum in the vicinity of a wavelength of 350 nm include an oxybenzophenone-based light selective absorber and a benzotriazole-based light selective absorption agent. Examples thereof include organic photoselective absorbers such as agents, salicylate ester-based photoselective absorbers, benzophenone-based photoselective absorbers, cyanoacrylate-based photoselective absorbers, and triazine-based photoselective absorbers. More specifically, for example, 5-chloro-2- (3,5-di-sec-butyl-2-hydroxylphenyl) -2H-benzotriazole, (2-2H-benzotriazole-2-yl) -6. -(Linear and side chain dodecyl) -4-methylphenol, 2-hydroxy-4-benzyloxybenzophenone, 2,4-benzyloxybenzophenone and the like can be mentioned. These organic light selective absorbers may be used alone or in combination of two or more. The molecular weight of the organic light selective absorber is preferably 100 or more and 3000 or less.

As the light selective absorber (A), a commercially available product may be used. For example, as a triazine-based light selective absorber, "Kemisorb 102" manufactured by Chemipro Kasei Co., Ltd., "ADEKA STAB LA46" manufactured by ADEKA Corporation, and "ADEKA STAB" LAF70, BASF Japan's "Chinubin 109", "Chinubin 171", "Chinubin 234", "Chinubin 326", "Chinubin 327", "Chinubin 328", "Chinubin 928", "Chinubin 400", "Chinubin" 460 ”,“ Chinubin 405 ”,“ Chinubin 477 ”and the like. Benzotriazole-based photoselective absorbers include "ADEKA STAB LA31" and "ADEKA STAB LA36" manufactured by ADEKA Corporation, and "Sumisorb 200", "Sumisorb 250", "Sumisorb 300", and "Sumisorb 340" manufactured by Sumika Chemtex Co., Ltd. And "Sumisorb 350", "Kemisorb 74", "Kemisorb 79" and "Kemisorb 279" made by Chemipro Kasei Co., Ltd., "TINUVIN 99-2", "TINUVIN 900" and "TINUVIN 928" made by BASF, etc. Can be mentioned.

Further, the light selective absorber (A) may be an inorganic light selective absorber. Examples of the inorganic light selective absorber include titanium oxide, zinc oxide, indium oxide, tin oxide, talc, kaolin, calcium carbonate, titanium oxide-based composite oxide, zinc oxide-based composite oxide, ITO (tin-doped indium oxide), and the like. ATO (antimonated tin oxide) and the like can be mentioned. Examples of the titanium oxide-based composite oxide include silica and zinc oxide doped with alumina. These inorganic light selective absorbers can be used alone or in combination of two or more. Further, the organic light selective absorber and the inorganic light selective absorber may be used in combination.

The light selective absorber (hereinafter, may be referred to as a light selective absorber (B)) containing a compound having an absorption maximum in the vicinity of a wavelength of 405 nm is preferably a compound satisfying the following formula (5), and further described below. It is more preferable that the compound satisfies the formula (6).
ε (405) ≧ 20 (5)
[In formula (5), ε (405) represents the gram extinction coefficient of the compound at a wavelength of 405 nm. The unit of the gram extinction coefficient is L / (g · cm). ]
ε (405) / ε (440) ≧ 20 (6)
[In formula (6), ε (405) represents the gram extinction coefficient of the compound at a wavelength of 405 nm, and ε (440) represents the gram extinction coefficient at a wavelength of 440 nm. ]
The gram absorbance coefficient is measured by the method described in Examples.

A compound having a larger value of ε (405) is more likely to absorb light having a wavelength of 405 nm, and suppresses deterioration of the optical laminate and the image display device in ultraviolet rays or visible light having a short wavelength. If the value of ε (405) is less than 20 L / (g · cm), the ultraviolet rays of the retardation film or the organic EL light emitting device must be increased unless the content of the light selective absorber (B) in the pressure-sensitive adhesive composition is increased. It tends to be difficult to exhibit the deterioration suppression function due to visible light of short wavelengths. The value of ε (405) is preferably 20 L / (g · cm) or more, more preferably 30 L / (g · cm) or more, and even more preferably 40 L / (g · cm) or more. Preferably, it is usually 500 L / (g · cm) or less.

The larger the value of ε (405) / ε (440), the more light in the vicinity of 405 nm is absorbed without disturbing the color expression of the image display device, and the light deterioration of the display device such as the retardation film or the organic EL element is deteriorated. It can be suppressed. The value of ε (405) / ε (440) is preferably 20 or more, more preferably 40 or more, even more preferably 70 or more, and particularly preferably 80 or more.

The compound that selectively absorbs light having a wavelength of 405 nm is preferably a compound having a merocyanine structure in the molecule. The molecular weight of the compound containing a merocyanine structure in the molecule is preferably 100 or more and 3000 or less. The compound containing a merocyanine structure in the molecule is a compound containing a partial structure represented by − (NC = CC = C) − in the molecule, and is, for example, a merocyanine compound or a cyanine compound. Examples thereof include compounds, indole-based compounds, and benzotriazole-based compounds. It is preferably a merocyanine-based compound, a cyanine-based compound, and a benzotriazole-based compound, and more preferably a compound represented by the formula (I).

［式中、Ｒ^１及びＲ^５は、それぞれ独立して、水素原子、置換基を有していてもよい炭素数１〜２５のアルキル基、置換基を有していてもよい炭素数７〜１５のアラルキル基、炭素数６〜１５のアリール基、複素環基を表し、該アルキル基又はアラルキル基に含まれる−ＣＨ_２−は−ＮＲ１Ａ−、−ＣＯ−、−ＳＯ_２−、−Ｏ−又は−Ｓ−に置換されていてもよい。
Ｒ^１Ａは、水素原子又は炭素数１〜６のアルキル基を表す。
Ｒ^２、Ｒ^３及びＲ^４は、それぞれ独立して、水素原子、置換基を有していてもよい炭素数１〜６のアルキル基、置換基を有していてもよい芳香族炭化水素基又は置換基を有していてもよい芳香族複素環基を表し、該アルキル基に含まれる−ＣＨ_２−は−ＮＲ^１Ｂ−、−ＣＯ−、−ＳＯ_２−、−Ｏ−又は−Ｓ−で置換されていてもよい。
Ｒ^１Ｂは、水素原子又は炭素数１〜６のアルキル基を表す。
Ｒ^６及びＲ^７は、それぞれ独立して、水素原子、炭素数１〜２５のアルキル基又は電子吸引性基を表すか、Ｒ^６及びＲ^７が互いに連結して環構造を形成してもよい。
Ｒ^１及びＲ^２は互いに連結して環構造を形成してもよく、Ｒ^２及びＲ^３は互いに連結して環構造を形成してもよく、Ｒ^２及びＲ^４は互いに連結して環構造を形成してもよく、Ｒ^３及びＲ^６は、互いに連結して環構造を形成してもよい。］

[In the formula, R ¹ and R ⁵ each independently have a hydrogen atom, an alkyl group having 1 to 25 carbon atoms which may have a substituent, and 7 to 7 carbon atoms which may have a substituent. It represents an aralkyl group of 15, an aryl group having 6 to 15 carbon atoms, and a heterocyclic group, and -CH _2- contained in the alkyl group or the aralkyl group is -NR1A-, -CO-, -SO _2- , -O-. Alternatively, it may be replaced with −S−.
R ^1A represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
R ² , R ³ and R ⁴ are independently hydrogen atoms, alkyl groups having 1 to 6 carbon atoms which may have a substituent, and aromatic hydrocarbon groups which may have a substituent. Alternatively, it represents an aromatic heterocyclic group which may have a substituent, and -CH _2- contained in the alkyl group is -NR ¹ B-, -CO-, -SO _2- , -O- or -S. It may be replaced with −.
R ^1B represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
R ⁶ and R ⁷ may independently represent a hydrogen atom, an alkyl group having 1 to 25 carbon atoms or an electron-withdrawing group, or R ⁶ and R ⁷ may be linked to each other to form a ring structure. ..
R ¹ and R ² may be connected to each other to form a ring structure, R ² and R ³ may be connected to each other to form a ring structure, and R ² and R ⁴ may be connected to each other to form a ring structure. R ³ and R ⁶ may be connected to each other to form a ring structure. ]

Examples of the alkyl group having 1 to 25 carbon atoms represented by R ¹ and R ⁵ include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a 2-cyanopropyl group, an n-butyl group, and a tert-butyl group. Examples thereof include sec-butyl group, n-pentyl group, n-hexyl group, 1-methylbutyl group, 3-methylbutyl group, n-octyl group, n-decyl, 2-hexyl-octyl group and the like.
Examples of the substituent that the alkyl group having 1 to 25 carbon atoms represented by R ¹ and R ^{5 may have include the groups described in the following group A.}
Group A: Nitro group, hydroxy group, carboxy group, sulfo group, cyano group, amino group, halogen atom, alkoxy group having 1 to 6 carbon atoms, alkylsilyl group having 1 to 12 carbon atoms, alkyl having 2 to 8 carbon atoms. carbonyl _{^{group, * - R a1 - (O}} -R a2) t1 -R a3 (R a1 and ^{R a2} each independently represent an alkanediyl group having 1 to 6 carbon ^{atoms, R a3} is 1 to carbon atoms 6 represents an alkyl group, and t1 represents an integer of 1 to 3).
Examples of the alkylsilyl group having 1 to 12 carbon atoms include a monoalkylsilyl group such as a methylsilyl group, an ethylsilyl group, and a propylsilyl group; a dialkylsilyl group such as a dimethylsilyl group, a diethylsilyl group, and a methylethylsilyl group; Examples thereof include a trialkylsilyl group such as a tripropylsilyl group.
Examples of the alkylcarbonyl group having 2 to 8 carbon atoms include a methylcarbonyl group and an ethylcarbonyl group.
Examples of the halogen atom include a fluorine atom, a chlorine atom and a bromine atom.

Examples of the aralkyl group having 7 to 15 carbon atoms represented by R ¹ and R ^{5 include a benzyl group and a phenylethyl group.} Examples of the group in which -CH _2- contained in the aralkyl group is replaced with -SO _2- or -COO- include an ethyl 2-phenylacetate group.
Examples of the substituent that the aralkyl group having 7 to 15 carbon atoms represented by R ¹ and R ^{5 may have include the group described in the above group A.}
Examples of the aryl group having 6 to 15 carbon atoms represented by R ¹ and R ⁵ include a phenyl group, a naphthyl group, an anthracenyl group and the like.
Examples of the substituent that the aryl group having 6 to 15 carbon atoms represented by R ¹ and R ^{5 may have are the groups described in the above group A.}
Examples of the heterocyclic group having 6 to 15 carbon atoms represented by R ¹ and R ⁵ include carbons such as pyridyl group, pyrrolidyl group, quinolyl group, thiophene group, imidazolyl group, oxazolyl group, pyrrole group, thiazolyl group and furanyl group. Examples thereof include aromatic heterocyclic groups of numbers 3-9.

Alkyl groups having 1 to 6 carbon atoms represented by R ^1A and R ^1B include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, tert-butyl group, sec-butyl group and n. -Pentyl group, n-hexyl group and the like can be mentioned.

Examples of the alkyl group having 1 to 6 carbon atoms represented by R ² , R ³ and R ⁴ include the same alkyl group having 1 to 6 carbon atoms represented by ^{R 1B.}
The R ^2, R ³ and substituents which may be alkyl groups have 1 to 6 carbon atoms represented by R ^4, include groups described in the above group A.
The aromatic hydrocarbon group represented by R ^2, R ³ and R ^4, a phenyl group, a naphthyl group, an aryl group anthracenyl group having 6 to 15 carbon atoms; benzyl, 7 carbon atoms such as a phenyl ethyl group There are 15 aralkyl groups.
The R ^2, R ³ and the aromatic hydrocarbon group substituents which may be possessed by represented by R ⁴ include groups described in the above group A.
The aromatic heterocyclic ring represented by R ^2, R ³ and R ^4, a pyridyl group, a pyrrolidyl group, a quinolyl group, a thiophene group, an imidazolyl group, an oxazolyl group, a pyrrole group, carbon atoms, such as thiazolyl group and a furanyl group 3 Aromatic heterocyclic groups of ~ 9 can be mentioned.
The R ^2, R ³ and the aromatic heterocyclic ring substituent which may have represented by R ^4, include groups described in the above group A.

Examples of the alkyl group having 1 to 25 carbon atoms represented by R ⁶ and R ⁷ include the same alkyl group having 1 to 25 carbon atoms represented by ^{R 1} and R ^5.
Examples of the substituent that the alkyl group having 1 to 25 carbon atoms represented by R ⁶ and R ^{7 may have include the group described in the above group A.}

Examples of the alkyl group having 1 to 25 carbon atoms represented by R ⁶ and R ⁷ include the same alkyl group having 1 to 25 carbon atoms represented by ^{R 1} and R ^5.
Examples of the electron-withdrawing group represented by R ⁶ and R ⁷ 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). ..

［式中、Ｒ^１１は、水素原子又は炭素数１〜２５のアルキル基を表し、該アルキル基に含まれるメチレン基の少なくとも１つは酸素原子に置換されていてもよい。
Ｘ^１は、−ＣＯ−、−ＣＯＯ−、−ＯＣＯ−、−ＣＳ−、−ＣＳＯ−、−ＣＳＳ−、−ＮＲ^１２ＣＯ−又はＣＯＮＲ^１３−を表す。
Ｒ^１２及びＲ^１３は、それぞれ独立して、水素原子、炭素数１〜６のアルキル基又はフェニル基を表す。］

[In the formula, R ¹¹ represents a hydrogen atom or an alkyl group having 1 to 25 carbon atoms, and at least one of the methylene groups contained in the alkyl group may be substituted with an oxygen atom.
X ¹ is, -CO -, - COO -, - OCO -, - CS -, - CSO -, - CSS -, - NR 12 CO- or CONR ¹³ - represents a.
R ¹² and R ¹³ independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a phenyl group. ]

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

R ⁶ and R ⁷ may be connected to each other to form ^{a ring structure, and examples of the ring structure formed from R 6} and R ⁷ include Meldrum's acid structure, barbituric acid structure, and dimedone structure. Be done.
Examples of the alkyl group having 1 to 25 carbon atoms represented by R ¹¹ include the same alkyl groups represented by ^{R 1} and R ^5.

The ring structure R ² and R3 are bonded to each other to form, a nitrogen-containing ring structure containing a nitrogen atom bonded with R ^2, for example, include nitrogen-containing heterocyclic 4-14 membered ring Be done. The ^{ring structure formed by connecting R 2} and R ³ to each other may be monocyclic or polycyclic. Specific examples thereof include a pyrrolidine ring, a pyrroline ring, an imidazolidine ring, an imidazoline ring, an oxazoline ring, a thiazolin ring, a piperidine ring, a morpholine ring, a piperazine ring, an indole ring, and an isoindole ring.

The ring structure formed by bonding ^{R 1} and R ^{2 to each other is a nitrogen-containing ring structure containing a nitrogen atom to which R 1} and R ² are bonded, and is, for example, a 4- to 14-membered ring (preferably). A nitrogen-containing heterocycle (4 to 8-membered ring) can be mentioned. The ^{ring structure formed by connecting R 1} and R ² to each other may be monocyclic or polycyclic. Specifically, the ^{same ring structure formed by connecting R 2} and R ³ to each other can be mentioned.

Examples of the ring structure formed by bonding R ² and R ⁴ to each other include a nitrogen-containing ring structure having a 4- to 14-membered ring, and a nitrogen-containing ring structure having a 5-membered ring to a 9-membered ring is preferable. The ^{ring structure formed by bonding R 2} and R ⁴ to each other may be monocyclic or polycyclic. These rings may have a substituent, and examples of such a ring structure include the same ring structures as those exemplified as the ring structure formed by ^{R 2} and R ^3.

As a ring structure formed by connecting ^{R 3} and R ^{6 to each other, R 3} -C = CC = C-R ⁶ is a ring structure forming a ring skeleton. For example, a phenyl group and the like can be mentioned.

Examples of the compound represented by the formula (I) in which R ² and R ³ are connected to each other to form a ring structure include a compound represented by the formula (IA), in which R ² and R ⁴ are connected to each other. Examples of the compound represented by the formula (I) which is linked to form a ring structure include a compound represented by the formula (IB).

［式（Ｉ−Ａ）、式（Ｉ−Ｂ）中、Ｒ^１、Ｒ^３、Ｒ^４、Ｒ^５、Ｒ^６及びＲ^７は、それぞれ上記と同じ意味を表す。
環Ｗ^１及び環Ｗ^２は、それぞれ独立して、含窒素環を表す。］

[Formula (I-A), wherein ^{(I-B), R 1} , R 3, R 4, R 5, R 6 and ^{R 7} each represent the same as defined above.
Ring W ¹ and ring W ² each independently represent a nitrogen-containing ring. ]

Ring W ¹ and ring W ² represent a nitrogen-containing ring containing a nitrogen atom as a constituent unit of the ring. Ring W ¹ and ring W ² may be monocyclic or polycyclic independently of each other, and may contain a heteroatom other than nitrogen as a ring constituent unit. It is preferable that the ring W ¹ and the ring W ² are independently 5-membered to 9-membered rings.

［式（Ｉ−Ａ−１）中、Ｒ^１、Ｒ^４、Ｒ^５、Ｒ^６及びＲ^７は、それぞれ上記と同じ意味を表す。
Ａ^１は、−ＣＨ_２−、−Ｏ−、−Ｓ−又は−ＮＲ^１Ｄ−を表す。
Ｒ^１４及びＲ^１５は、それぞれ独立して、水素原子又は炭素数１〜１２のアルキル基を表す。
Ｒ^１Ｄは、水素原子又は炭素数１〜６のアルキル基を表す。］ The compound represented by the formula (IA) is preferably a compound represented by the formula (IA-1).

[In the formula (IA-1), R ¹ , R ⁴ , R ⁵ , R ⁶ and R ⁷ have the same meanings as described above, respectively.
A ¹ represents -CH _2- , -O-, -S- or -NR ¹ D-.
R ¹⁴ and R ¹⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 12 carbon atoms.
R ^1D represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. ]

［式（Ｉ−Ｂ−１）中、Ｒ^１、Ｒ^６及びＲ^７は、それぞれ上記と同じ意味を表す。
Ｒ^１６は、それぞれ独立して、水素原子又は炭素数１〜１２のアルキル基、アリール基を表す。］ The compound represented by the formula (IB) is preferably a compound represented by the formula (IB-1) and a compound represented by the formula (IB-2).

[In the formula (IB-1), R ¹ , R ⁶ and R ⁷ have the same meanings as described above, respectively.
R ¹⁶ independently represents a hydrogen atom or an alkyl group or an aryl group having 1 to 12 carbon atoms. ]

［式（Ｉ−Ｂ−２）中、Ｒ^３、Ｒ^５、Ｒ^６及びＲ^７は、それぞれ上記と同じ意味を表す。
Ｒ^３０は、水素原子、シアノ基、ニトロ基、ハロゲン原子、メルカプト基、アミノ基、炭素数１〜１２のアルキル基、炭素数１〜１２のアルコキシ基、炭素数６〜１８の芳香族炭化水素基、炭素数２〜１３のアシル基、炭素数２〜１３のアシルオキシ基又は炭素数２〜１３のアルコキシカルボニル基を表す。
Ｒ^３１は、炭素数１〜１２のアルキル基、炭素数１〜１２のアルコキシ基、メルカプト基、炭素数１〜１２のアルキルチオ基、置換基を有していてもよいアミノ基又は複素環基を表す。］

[In the formula (IB-2), R ³ , R ⁵ , R ⁶ and R ⁷ have the same meanings as described above.
R ³⁰ is a hydrogen atom, a cyano group, a nitro group, a halogen atom, a mercapto group, an amino group, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, and an aromatic hydrocarbon having 6 to 18 carbon atoms. It represents a group, an acyl group having 2 to 13 carbon atoms, an acyloxy group having 2 to 13 carbon atoms, or an alkoxycarbonyl group having 2 to 13 carbon atoms.
R ³¹ is an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, a mercapto group, an alkylthio group having 1 to 12 carbon atoms, an amino group or a heterocyclic group which may have a substituent. Represent. ]

Examples of the halogen atom represented by R ³⁰ include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
The acyl group having a carbon number of 2 to 13 represented by R ³⁰ represented by R ^30, an acetyl group, and the like propionyl group and butyryl group.
Examples of the acyloxy group having 2 to 13 carbon atoms represented by R ³⁰ include a methylcarbonyloxy group, an ethylcarbonyloxy group, a propylcarbonyloxy group, a butylcarbonyloxy group and the like.
Examples of the alkoxycarbonyl group having 2 to 13 carbon atoms represented by R ³⁰ include a methoxycarbonyl group, an ethoxycarbonyl group, a propoxycarbonyl group, and a butoxycarbonyl group.
The aromatic hydrocarbon group having 6 to 18 carbon atoms represented by R ^30, a phenyl group, a naphthyl group, an aryl group having 6 to 18 carbon atoms such as biphenyl group; a benzyl group, carbon atoms, such as phenylethyl group 7 Included are ~ 18 aralkyl groups.
Examples of the alkyl group having 1 to 12 carbon atoms represented by R ³⁰ include the same alkyl group having 1 to 12 carbon atoms represented by ^{R 14.}
Examples of the alkyl group having 1 to 12 carbon atoms represented by R ³⁰ include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group and the like.
R ³⁰ is preferably an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an amino group or a mercapto group.

Examples of the alkyl group having 1 to 12 carbon atoms represented by R ³¹ include the same alkyl group having 1 to 12 carbon atoms represented by ^{R 14.}
Examples of the alkoxy group having 1 to 12 carbon atoms represented by R ³¹ include the same alkoxy group having 1 to 12 carbon atoms represented by ^{R 30.}
Examples of the alkylthio group having 1 to 12 carbon atoms represented by R ³¹ include a methylthio group, an ethylthio group, a propylthio group, a butylthio group, a pentylthio group, a hexylthio group and the like.
As the ^{amino group which may have a substituent represented by R 31} , it was substituted with one alkyl group having 1 to 8 carbon atoms such as an amino group; an N-methylamino group and an N-ethylamino group. Amino groups; amino groups substituted with two alkyl groups having 1 to 8 carbon atoms such as N, N-dimethylamino group, N, N-diethylamino group, N, N-methylethylamino group; and the like.
Examples of the heterocycle represented by R ³¹ include nitrogen-containing heterocyclic groups having 4 to 9 carbon atoms such as a pyrrolidinyl group, a piperidinyl group, and a morpholinyl group.

［式（Ｉ−Ｃ）中、Ｒ^１、Ｒ^６及びＲ^７は上記と同じ意味を表す。
Ｒ^２１、Ｒ^２２は、それぞれ独立して、水素原子、炭素数１〜１２のアルキル基又はヒドロキシ基を表す。
Ｘ^２及びＸ^３は、それぞれ独立して、−ＣＨ_２−又は−Ｎ（Ｒ^２５）＝を表す。
Ｒ^２５は、水素原子、炭素数１〜２５のアルキル基、置換基を有していてもよい芳香族炭化水素基を表す。］ The ^{compound represented by the formula (I) in which R 3} and R ⁶ are linked to each other to form a ring structure and R ² and R ⁴ are bonded to each other to form a ring structure is represented by the formula (IC). Examples thereof include compounds represented by.

[In formula (IC), R ¹ , R ⁶ and R ⁷ have the same meanings as above.
R ²¹ and R ²² independently represent a hydrogen atom and an alkyl group or a hydroxy group having 1 to 12 carbon atoms.
X ² and X ³ independently _{represent −CH 2-} or −N (R ²⁵ ) =.
R ²⁵ represents an aromatic hydrocarbon group which may have a hydrogen atom, an alkyl group having 1 to 25 carbon atoms, and a substituent. ]

Examples of the alkyl group having 1 to 25 carbon atoms represented by R ²⁵ include the same alkyl group having 1 to 25 carbon atoms represented by ^{R 1.}
The aromatic hydrocarbon group represented by R ^25, a phenyl group, an aryl group such as phenyl or naphthyl benzyl group, aralkyl groups such as phenylethyl group: biphenyl group and the like, aromatic C6-20 It is preferably a hydrocarbon group. The aromatic hydrocarbon group substituents which may be possessed by represented by R ^25, hydroxy group, and the like.

It is preferable that R ³ and R ⁶ are independently attracting electrons.

The ^{compound represented by the formula (I) in which R 1} and R ² are linked to each other to form a ring structure and R ³ and R ⁶ are bonded to each other to form a ring structure is represented by the formula (ID). Examples thereof include compounds represented by.

［式（Ｉ−Ｄ）中、Ｒ^４、Ｒ^５、Ｒ^７は上記と同じ意味を表す。
Ｒ^２５、Ｒ^２６、Ｒ^２７及びＲ^２８は、それぞれ独立して、水素原子、置換基を有してもよい炭素数１〜１２のアルキル基、ヒドロキシ基、アラルキル基を表す。］

[In the formula (ID), R ⁴ , R ⁵ , and R ⁷ have the same meanings as described above.
R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ each independently represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms which may have a substituent, a hydroxy group, and an aralkyl group. ]

Examples of the alkyl group having 1 to 12 carbon atoms represented by R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ include the same alkyl group having 1 to 12 carbon atoms represented by ^{R 1A} and R ^1B. Examples of the substituent that the alkyl group having 1 to 12 carbon atoms represented by R ²⁵ , R ²⁶ , R ²⁷ and R ^{28 may have is a hydroxy group.}
Examples of the aralkyl group represented by R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ include an aralkyl group having 7 to 15 carbon atoms such as a benzyl group and a phenylethyl group.

Examples of the ^{compound (I) in which R 6} and R ⁷ are linked to each other to form a ring structure include a compound represented by the formula (IE).

［式（Ｉ−Ｅ）中、Ｒ^１、Ｒ^２、Ｒ^３、Ｒ^４、Ｒ^５は、それぞれ上記と同じ意味を表す。環Ｗ^３は、環状化合物を表す]
環Ｗ^３は、５員環〜９員環の環であり、窒素原子、酸素原子、硫黄原子等のヘテロ原子を環の構成単位として含んでいてもよい。

[In the formula (IE), R ¹ , R ² , R ³ , R ⁴ , and R ⁵ have the same meanings as described above. Ring W ³ being representative of the cyclic compounds]
Ring W ³ is a 5-membered to 9-membered ring, and may contain a hetero atom such as a nitrogen atom, an oxygen atom, or a sulfur atom as a constituent unit of the ring.

［式（ＩＥ−１）中、Ｒ^１、Ｒ^２、Ｒ^３及びＲ^５は、それぞれ上記と同じ意味を表す。
Ｒ^１７、Ｒ^１８、Ｒ^１９、Ｒ^ｑは、それぞれ独立して、水素原子又は置換基を有してもよい炭素数１〜１２のアルキル基、アラルキル基、アリール基を表し、該アルキル基又はアラルキル基に含まれる−ＣＨ２−基は−ＮＲ^１Ｄ−、−Ｃ（＝Ｏ）−、−Ｃ（＝Ｓ）−、−Ｏ−、−Ｓ−に置換されていてもよく、Ｒ^１７及びＲ^１８は互いに連結して環構造を形成してもよく、Ｒ^１８及びＲ^１９は互いに連結して環構造を形成してもよく、Ｒ^１９及びＲ^ｑは、互いに連結して環構造を形成してもよい。ｍ、ｐ、ｑはそれぞれ独立して０〜３の整数を表す。］ The compound represented by the formula (IE) is preferably a compound represented by the formula (IE-1).

[In the formula (IE-1), R ¹ , R ² , R ³ and R ⁵ have the same meanings as described above.
R ¹⁷ , R ¹⁸ , R ¹⁹ , and R ^q each independently represent an alkyl group, an aralkyl group, or an aryl group having 1 to 12 carbon atoms which may have a hydrogen atom or a substituent, and the alkyl group or the alkyl group or The -CH2- group contained in the aralkyl group may be ^{substituted with -NR 1D-} , -C (= O)-, -C (= S)-, -O-, -S-, and R ¹⁷ and R ¹⁸ may be connected to each other to form a ring structure, R ¹⁸ and R ¹⁹ may be connected to each other to form a ring structure, and R ¹⁹ and R ^q may be connected to each other to form a ring structure. You may. m, p, and q each independently represent an integer of 0 to 3. ]

Examples of the compound represented by the formula (I) include the following compounds.

The total content of the light selective absorber is not limited as long as the absorbance of the pressure-sensitive adhesive layer at a wavelength of 410 nm is selected to be 0.1 or more and 2.3 or less, but in the pressure-sensitive adhesive composition, for example, all resins. It is 0.01 to 20 parts by mass, preferably 0.05 to 15 parts by mass, and more preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the component.
The mass ratio of the light selective absorber (A) to the light selective absorber (B) (light selective absorber (A) / light selective absorption (B)) is usually 0.05 to 20, preferably 0. 1 to 10.

((Meta) Acrylic resin (A))
The (meth) acrylic resin (A) is preferably a polymer containing a structural unit derived from the (meth) acrylic acid ester as a main component (preferably containing 50% by mass or more). The structural unit derived from the (meth) acrylic acid ester is a structural unit derived from one or more monomers other than the (meth) acrylic acid ester (for example, a structural unit derived from a monomer having a polar functional group). It may be included. In the present specification, (meth) acrylic acid means that either acrylic acid or methacrylic acid may be used, and "(meth)" in the case of (meth) acrylate or the like has the same meaning. ..

［式（Ｘ）中、Ｒ^１０１は水素原子又はメチル基で表し、Ｒ^１０２は炭素数１〜１４のアルキル基または炭素数７〜２０のアラルキル基を表し、該アルキル基または該アラルキル基の水素原子は、炭素数１〜１０のアルコキシ基で置き換わっていてもよい。］ Examples of the (meth) acrylic acid ester include (meth) acrylic acid ester represented by the following formula (X).

[In formula (X), R ¹⁰¹ is represented by a hydrogen atom or a methyl group, R ¹⁰² represents an alkyl group having 1 to 14 carbon atoms or an alkoxy group having 7 to 20 carbon atoms, and hydrogen of the alkyl group or the aralkyl group. The atom may be replaced with an alkoxy group having 1 to 10 carbon atoms. ]

In the formula (X), R ¹⁰² is preferably an alkyl group having 1 to 14 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms.

As the (meth) acrylic acid ester represented by the formula (X),
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, (meth) acrylate Linear alkyl esters of (meth) acrylic acid, such as lauryl, stearyl (meth) acrylic acid, etc .;
(Meta) i-propyl acrylate, (meth) i-butyl acrylate, t-butyl (meth) acrylate, i-pentyl (meth) acrylate, i-hexyl (meth) acrylate, (meth) acrylate Branches of (meth) acrylic acid such as 2-ethylhexyl, i-octyl (meth) acrylic acid, i-nonyl (meth) acrylic acid, i-stearyl (meth) acrylic acid, i-amyl (meth) acrylic acid, etc. Alkyl ester;
Cyclohexyl (meth) acrylate, isobolonyl (meth) acrylate, adamantyl (meth) acrylate, dicyclopentanyl (meth) acrylate, cyclododecyl (meth) acrylate, methylcyclohexyl (meth) acrylate, ( Alicyclic skeleton-containing alkyl ester of (meth) acrylic acid such as trimethylcyclohexyl acrylate, tert-butylcyclohexyl (meth) acrylate, cyclohexyl α-ethoxyacrylate, etc.;
Aromatic ring skeleton-containing ester of (meth) acrylic acid such as phenyl (meth) acrylic acid;
And so on.
Further, a substituent-containing (meth) acrylic acid alkyl ester in which a substituent is introduced into the alkyl group in the (meth) acrylic acid alkyl ester can also be mentioned. The substituent of the substituent-containing (meth) acrylic acid alkyl ester is a group that substitutes a hydrogen atom of the alkyl group, and specific examples thereof include a phenyl group, an alkoxy group, and a phenoxy group. Specific examples of the substituent-containing (meth) acrylic acid alkyl ester include (meth) acrylic acid 2-methoxyethyl, (meth) acrylic acid ethoxymethyl, (meth) acrylic acid phenoxyethyl, and (meth) acrylic acid 2-. Examples thereof include (2-phenoxyethoxy) ethyl, phenoxydiethylene glycol (meth) acrylate, and phenoxypoly (ethylene glycol) (meth) acrylate.

Each of these (meth) acrylic acid esters can be used alone, or a plurality of different ones may be used.

The (meth) acrylic resin (A) is a structural unit derived from an acrylic acid alkyl ester (a1) having a homopolymer glass transition temperature Tg of less than 0 ° C., and an alkyl acrylate having a homopolymer Tg of 0 ° C. or higher. It preferably contains a structural unit derived from the ester (a2). It is advantageous to contain the structural unit derived from the acrylic acid alkyl ester (a1) and the structural unit derived from the acrylic acid alkyl ester (a2) in order to enhance the high temperature durability of the pressure-sensitive adhesive layer. As the Tg of the homopolymer of the (meth) acrylic acid alkyl ester, a literature value such as POLYMER HANDBOOK (Wiley-Interscience) can be adopted.

Specific examples of the acrylic acid alkyl ester (a1) include 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, n-dodecyl acrylate and the like Examples thereof include acrylic acid alkyl esters having a group having about 2 to 12 carbon atoms.

As the acrylic acid alkyl ester (a1), only one type may be used, or two or more types may be used in combination. Among them, n-butyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate and the like are preferable from the viewpoint of followability and reworkability when the pressure-sensitive adhesive layer of the present invention is laminated on the optical laminate.

The acrylic acid alkyl ester (a2) is an acrylic acid alkyl ester other than the acrylic acid alkyl ester (a1). Specific examples of the acrylic acid alkyl ester (a2) include methyl acrylate, cyclohexyl acrylate, and isobolonyl acrylate. Includes stearyl acrylate, t-butyl acrylate and the like.

As the acrylic acid alkyl ester (a2), only one type may be used, or two or more types may be used in combination. Above all, from the viewpoint of high temperature durability, the acrylic acid alkyl ester (a2) preferably contains methyl acrylate, cyclohexyl acrylate, isobolonyl acrylate and the like, and more preferably contains methyl acrylate.

The structural unit derived from the (meth) acrylic acid ester represented by the formula (I) is preferably 50% by mass or more, preferably 60 to 95% by mass, based on the total structural units contained in the (meth) acrylic resin. It is preferably 65 to 95% by mass or more, and more preferably 65 to 95% by mass or more.

As the structural unit derived from the monomer other than the (meth) acrylic acid ester, the structural unit derived from the monomer having a polar functional group is preferable, and the structure derived from the (meth) acrylic acid ester having a polar functional group is preferable. The unit is more preferred. Examples of the polar functional group include a hydroxy group, a carboxyl group, a substituted or unsubstituted amino group, a heterocyclic group such as an epoxy group, and the like.
As a monomer having a polar functional group,
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, 3-hydroxyhexyl (meth) 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 , (Meta) acrylate 5-hydroxyhexyl, (meth) acrylate 5-hydroxyheptyl, (meth) acrylate 5-hydroxyoctyl, (meth) acrylate 5-hydroxynonyl, (meth) acrylate 6-hydroxyhexyl , (Meta) Acrylic Acid 6-Hydroxyheptyl, (Meta) Acrylic Acid 6-Hydroxyoctyl, (Meta) Acrylic Acid 6-Hydroxynonyl, (Meta) Acrylic Acid 6-Hydroxydecyl, (Meta) Acrylic Acid 7-Hydroxyheptyl , (Meta) acrylate 7-hydroxyoctyl, (meth) acrylate 7-hydroxynonyl, (meth) acrylate 7-hydroxydecyl, (meth) acrylate 7-hydroxyundecyl, (meth) acrylate 8-hydroxy Octyl, 8-hydroxynonyl (meth) acrylate, 8-hydroxydecyl (meth) acrylate, 8-hydroxyundecyl (meth) acrylate, 8-hydroxydodecyl (meth) acrylate, 9-hydroxydecyl (meth) acrylate Hydroxynonyl, 9-hydroxydecyl (meth) acrylate, 9-hydroxyundecyl (meth) acrylate, 9-hydroxydodecyl (meth) acrylate, (meth) ac 9-Hydroxytridecyl lylicate, 10-hydroxydecyl (meth) acrylate, 10-hydroxyundecyl (meth) acrylate, 10-hydroxydodecyl (meth) acrylate, 10-hydroxytridecyl acrylate, (meth) 10-Hydroxytetradecyl acrylate, 11-hydroxyundecyl (meth) acrylate, 11-hydroxydodecyl (meth) acrylate, 11-hydroxytridecyl (meth) acrylate, 11-hydroxytetradecyl (meth) acrylate , (Meta) Acrylic Acid 11-Hydroxypentadecyl, (Meta) Acrylic Acid 12-Hydroxydodecyl, (Meta) Acrylic Acid 12-Hydroxytridecyl, (Meta) Acrylic Acid 12-Hydroxytetradecyl, (Meta) Acrylic Acid 13 −Hydroxypentadecyl, 13-hydroxytetradecyl (meth) acrylate, 13-hydroxypentadecyl (meth) acrylate, 14-hydroxytetradecyl (meth) acrylate, 14-hydroxypentadecyl (meth) acrylate, ( A monomer having a hydroxy group such as 15-hydroxypentadecyl (meth) acrylate and 15-hydroxyheptadecyl (meth) acrylate;
A single amount having a carboxyl group such as (meth) acrylic acid, carboxyalkyl (meth) acrylate (for example, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate), maleic acid, maleic anhydride, fumaric acid, crotonic acid, etc. body;
Acryloyl morpholine, vinyl caprolactam, N-vinyl-2-pyrrolidone, vinyl pyridine, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, glycidyl (meth) acrylate, Monomer having a heterocyclic group such as 2,5-dihydrofuran;
Examples thereof include monomers having a substituted or unsubstituted amino group such as aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and dimethylaminopropyl (meth) acrylate.
Among them, a monomer having a hydroxy group or a monomer having a carboxyl group is preferable, and a monomer having a hydroxy group and a carboxyl group are preferable in terms of the reactivity between the (meth) acrylic acid ester polymer and the cross-linking agent. It is more preferable to contain any of the monomers having a group.

As the monomer having a hydroxy group, 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 5-hydroxypentyl acrylate, and 6-hydroxyhexyl acrylate are preferable. In particular, good durability can be obtained by using 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate and 5-hydroxypentyl acrylate.
Acrylic acid is preferably used as the monomer having a carboxyl group.

From the viewpoint of preventing the peeling power of the separate film that can be laminated on the outer surface of the pressure-sensitive adhesive layer from being enhanced, the (meth) acrylic resin (A) substantially contains a structural unit derived from a monomer having an amino group. It is preferable that there is no such thing. Here, substantially not contained means that the amount is 0.1 parts by mass or less out of 100 parts by mass of all the constituent units constituting the (meth) acrylic resin (a).

The content of the structural unit derived from the monomer having a polar functional group is preferably 20 parts by mass or less, more preferably 0, with respect to 100 parts by mass of all the structural units of the (meth) acrylic resin (A). It is 5.5 parts by mass or more and 15 parts by mass or less, 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.

The content of the structural unit derived from the monomer having an aromatic group is preferably 20 parts by mass or less, more preferably 4 parts by mass, based on 100 parts by mass of all the structural units of the (meth) acrylic resin (A). 2 parts or more and 20 parts by mass or less, more preferably 4 parts by mass or more and 16 parts by mass or less.

Structural units derived from monomers other than the (meth) acrylate ester include structural units derived from styrene-based monomers, structural units derived from vinyl-based monomers, and a plurality of (meth) acryloyl in the molecule. Structural units derived from a monomer having a group, structural units derived from a (meth) acrylamide-based monomer, and the like can also be mentioned.

Examples of the styrene-based monomer include styrene; methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene, triethylstyrene, propylstyrene, butylstyrene, hexylstyrene, heptylstyrene, octylstyrene and other alkylstyrenes; fluorostyrene, Examples thereof include halogenated styrene such as chlorostyrene, bromostyrene, dibromostyrene and iodostyrene; nitrostyrene; acetylstyrene; methoxystyrene; and divinylbenzene.

Examples of the vinyl-based monomer 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 chloride and the like. Examples thereof include vinylidene halide; nitrogen-containing heteroaromatic vinyl such as vinylpyridine, vinylpyrrolidone and vinylcarbazole; conjugated diene such as butadiene, isoprene and chloroprene; and unsaturated nitriles such as acrylonitrile and methacrylonitrile.

Examples of the monomer having a plurality of (meth) acryloyl groups in the molecule include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and 1,9-nonanediol di ( Two (meth) acryloyl groups in a molecule such as meta) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, and tripropylene glycol di (meth) acrylate. Monomer having; Examples thereof include a monomer having three (meth) acryloyl groups in the molecule such as trimethyl propantri (meth) acrylate.

Examples of the (meth) acrylamide-based monomer include N-methylol (meth) acrylamide, N- (2-hydroxyethyl) (meth) acrylamide, N- (3-hydroxypropyl) (meth) acrylamide, and N- (4-). Hydroxybutyl) (meth) acrylamide, N- (5-hydroxypentyl) (meth) acrylamide, N- (6-hydroxyhexyl) (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl ( Meta) 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-acrylloylamino-2-methyl-1-propanesulfonic acid, N- (methoxymethyl) acrylamide, N- (ethoxymethyl) (meth) acrylamide, N -(Prooxymethyl) (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) (Meta) acrylamide, N- (2-propoxyethyl) (meth) acrylamide, N- [2- (1-methylethoxy) ethyl] (meth) acrylamide, N- [2- (1-methylpropoxy) ethyl] ( Meta) acrylamide, N- [2- (2-methylpropoxy) ethyl] (meth) acrylamide, N- (2-butoxyethyl) (meth) acrylamide, N- [2- (1,1-dimethylethoxy) ethyl] Examples include (meth) acrylamide. Of these, N- (methoxymethyl) acrylamide, N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (butoxymethyl) acrylamide and N- (2-methylpropoxymethyl) acrylamide are preferable.

The weight average molecular weight (Mw) of the (meth) acrylic resin (A) is preferably 500,000 to 2.5 million. When the weight average molecular weight is 500,000 or more, the durability of the pressure-sensitive adhesive layer is improved, and problems such as floating and peeling between the adherend and the pressure-sensitive adhesive layer and cohesive destruction of the pressure-sensitive adhesive layer are caused. Easy to suppress. When the weight average molecular weight is 2.5 million or less, it is advantageous from the viewpoint of coatability. From the viewpoint of achieving both the durability of the 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, often preferably 700,000 to 1.7 million, and particularly preferably 100. It is 10,000 to 1.6 million. The molecular weight distribution (Mw / Mn) represented by 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, and more preferably 3 to 6. .. The weight average molecular weight can be analyzed by gel permeation chromatography and is a value in terms of standard polystyrene.

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

The glass transition temperature (Tg) of the (meth) acrylic resin (A) is, for example, −60 to 20 ° C., preferably −50 to 15 ° C., more preferably −45 to 10 ° C., and particularly −40 to 0 ° C. You may. When Tg is not more than the upper limit value, it is advantageous to improve the wettability of the pressure-sensitive adhesive layer with respect to the adherend base material, and when it is not more than the lower limit value, it is advantageous to improve the durability of the pressure-sensitive adhesive layer. The glass transition temperature can be measured by a differential scanning calorimeter (DSC).

The (meth) acrylic resin (A) can be produced by a known method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method, or an emulsion polymerization method, and the solution polymerization method is particularly preferable. As a solution polymerization method, for example, a monomer and an organic solvent are mixed, a thermal polymerization initiator is added under a nitrogen atmosphere, and a temperature condition of 40 to 90 ° C., preferably about 50 to 80 ° C. is 3 to 15 A method of stirring for about an hour can be mentioned. In order to control the reaction, a monomer or a thermal polymerization initiator may be added continuously or intermittently during the polymerization. The monomer and the heat initiator may be in a state of being added to an organic solvent.

As the polymerization initiator, a thermal polymerization initiator, a photopolymerization initiator and the like are used. Examples of the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone. Examples of the thermal polymerization initiator include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane-1-carbonitrile), and 2 , 2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl-2,2'-azobis (2-methylpropionate) ), 2,2'-Azobis (2-hydroxymethylpropionitrile) and other azo compounds; lauryl peroxide, t-butyl hydroperoxide, benzoyl peroxide, t-butyl peroxybenzoate, cumene hydroperoxide, Organic peroxides such as diisopropylperoxydicarbonate, dipropylperoxydicarbonate, t-butylperoxyneodecanoate, t-butylperoxypivalate, (3,5,5-trimethylhexanoyl) peroxide ; Examples include inorganic peroxides such as potassium persulfate, ammonium persulfate, and hydrogen peroxide. In addition, a redox-based initiator in which a peroxide and a reducing agent are used in combination can also be used.

The ratio of the polymerization initiator is about 0.001 to 5 parts by mass with respect to 100 parts by mass of the total amount of the monomers constituting the (meth) acrylic resin (A). For the polymerization of the (meth) acrylic resin, a polymerization method using active energy rays (for example, ultraviolet rays) may be used.

Examples of the organic solvent include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; fatty alcohols such as propyl alcohol and isopropyl alcohol; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone. Can be mentioned.

The content of the (meth) acrylic resin (A) is usually 60% by mass to 99.9% by mass, preferably 70% by mass to 99.5% by mass, based on 100% by mass of the pressure-sensitive adhesive composition. More preferably, it is 80% by mass to 99% by mass.

The cross-linking agent (B) reacts with polar functional groups (for example, hydroxy group, amino group, carboxyl group, heterocyclic group, etc.) in the (meth) acrylic resin (A). The cross-linking agent (B) forms a cross-linked structure with a (meth) acrylic resin or the like, and forms a cross-linked structure advantageous in durability and reworkability.

Examples of the cross-linking agent (B) include an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, an aziridine-based cross-linking agent, a metal chelate-based cross-linking agent, and the like. From the viewpoint of speed and the like, an isocyanate-based cross-linking agent is preferable.

As the isocyanate-based compound, a compound having at least two isocyanato groups (-NCO) in the molecule is preferable, and for example, an aliphatic isocyanate-based compound (for example, hexamethylene diisocyanate) and an alicyclic isocyanate-based compound (for example, isophorone diisocyanate) are preferable. , Hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate), aromatic isocyanate-based compounds (for example, tolylene diisocyanate, xylylene diisocyanate diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, etc.) and the like. The cross-linking agent (B) is an adduct (adduct) of the isocyanate compound made of a polyhydric alcohol compound [for example, an adduct made of glycerol, trimethylolpropane, etc.], an isocyanurate, a burette-type compound, a polyether polyol, or a polyester. It may be a derivative such as a urethane prepolymer type isocyanate compound which has been subjected to an addition reaction with a polyol, an acrylic polyol, a polybutadiene polyol, a polyisoprene polyol or the like. The cross-linking agent (B) can be used alone or in combination of two or more. Of these, typically aromatic isocyanate compounds (eg, tolylene diisocyanate, xylylene diisocyanate), aliphatic isocyanate compounds (eg, hexamethylene diisocyanate) or their polyhydric alcohol compounds (eg, glycerol, trimethylolpropane). ), Or isocyanurates. If the cross-linking agent (B) is an aromatic isocyanate compound and / or an adduct of these polyhydric alcohol compounds or an isocyanurate compound, it is advantageous for forming an optimum cross-linking density (or cross-linking structure). The durability of the adhesive layer can be improved. In particular, an adduct made of a tolylene diisocyanate compound and / or a polyhydric alcohol compound thereof can improve durability even when, for example, an adhesive layer is applied to a polarizing plate.

The content of the cross-linking agent (B) is usually 0.01 to 15 parts by mass, preferably 0.05 to 10 parts by mass, based on 100 parts by mass of the (meth) acrylic resin (A). It is preferably 0.1 to 5 parts by mass.

The pressure-sensitive adhesive composition forming the light-selective absorbing pressure-sensitive adhesive layer of the present invention may further contain the silane compound (D).
Examples of the silane compound (D) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, and 3 -Glysidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, Examples thereof include 3-methacryloyloxypropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane.
The silane compound (D) may be a silicone oligomer. Specific examples of the silicone oligomer are as follows in the form of a combination of the monomers.

3-Mercaptopropyltrimethoxysilane-tetramethoxysilane oligomer, 3-mercaptopropyltrimethoxysilane-tetraethoxysilane oligomer, 3-mercaptopropyltriethoxysilane-tetramethoxysilane oligomer, 3-mercaptopropyltriethoxysilane-tetraethoxysilane Mercaptopropyl group-containing oligomers such as oligomers; mercaptomethyltrimethoxysilane-tetramethoxysilane oligomer, mercaptomethyltrimethoxysilane-tetraethoxysilane oligomer, mercaptomethyltriethoxysilane-tetramethoxysilane oligomer, mercaptomethyltriethoxysilane-tetraethoxy Mercaptomethyl group-containing oligomers such as silane oligomers; 3-glycidoxypropyltrimethoxysilane-tetramethoxysilane copolymer, 3-glycidoxypropyltrimethoxysilane-tetraethoxysilane copolymer, 3-glycidoxypropyltriethoxysilane- Tetramethoxysilane copolymer, 3-Glydoxypropyltriethoxysilane-Tetraethoxysilane copolymer, 3-Glydoxypropylmethyldimethoxysilane-Tetramethoxysilane copolymer, 3-Glydoxypropylmethyldimethoxysilane-Tetraethoxysilane copolymer, 3-Glydoxypropyl group-containing copolymers such as 3-glycidoxypropylmethyldiethoxysilane-tetramethoxysilane copolymer, 3-glycidoxypropylmethyldiethoxysilane-tetraethoxysilane copolymer; 3-methacryloyloxypropyltri Methoxysilane-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, 3-methacryloyloxypropylmethyldi Propylsilane-tetraethoxysilane oligomer, etc. 3-Acryloyloxypropyltrimethoxysilane-Tetramethoxysilane oligomer, 3-Acryloyloxypropyltrimethoxysilane-Tetraethoxysilane oligomer, 3-Acryloyloxypropyltriethoxysilane-Tetramethoxysilane oligomer, 3-Acryloyloxypropyltriethoxysilane-tetraethoxysilane oligomer, 3-acryloyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer, 3-acryloyloxypropylmethyldimethoxysilane-tetraethoxysilane oligomer, 3-acryloyloxypropylmethyldiethoxy Acryloyloxypropyl group-containing oligomers such as silane-tetramethoxysilane oligomer, 3-acryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer; vinyltrimethoxysilane-tetramethoxysilane oligomer, vinyltrimethoxysilane-tetraethoxysilane oligomer, Vinyl Triethoxysilane-Tetramethoxysilane oligomer, Vinyltriethoxysilane-Tetraethoxysilane oligomer, Vinylmethyldimethoxysilane-Tetramethoxysilane oligomer, Vinylmethyldimethoxysilane-Tetraethoxysilane oligomer, Vinylmethyldiethoxysilane-Tetramethoxysilane oligomer , Vinyl group-containing oligomers such as vinylmethyldiethoxysilane-tetraethoxysilane oligomer; 3-aminopropyltrimethoxysilane-tetramethoxysilane copolymer, 3-aminopropyltrimethoxysilane-tetraethoxysilane copolymer, 3-aminopropyltriethoxy Silane-tetramethoxysilane copolymer, 3-aminopropyltriethoxysilane-tetraethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-aminopropyl Amino group-containing copolymers such as methyldiethoxysilane-tetramethoxysilane copolymer and 3-aminopropylmethyldiethoxysilane-tetraethoxysilane copolymer.

The silane compound (D) may be a silane compound represented by the following formula (d1). When the pressure-sensitive adhesive composition contains a silane compound represented by the following formula (d1), the adhesiveness to the substrate, glass, transparent electrode, etc. can be further improved, so that floating and foaming are less likely to occur in a high temperature environment. A pressure-sensitive adhesive layer having good durability can be formed.

（式中、Ｂは、炭素数１〜２０のアルカンジイル基又は炭素数３〜２０の二価の脂環式炭化水素基を示し、前記アルカンジイル基及び前記脂環式炭化水素基を構成する−ＣＨ_２−は、−Ｏ−又は−ＣＯ−に置換されてもよく、Ｒ^ｄ７は炭素数１〜５のアルキル基を示し、Ｒ^ｄ８、Ｒ^ｄ９、Ｒ^ｄ１０、Ｒ^ｄ１１及びＲ^ｄ１２はそれぞれ独立して、炭素数１〜５のアルキル基又は炭素数１〜５のアルコキシ基を示す）

(In the formula, B represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and constitutes the alkanediyl group and the alicyclic hydrocarbon group. -CH _2- may be substituted with -O- or -CO-, R ^d7 represents an alkyl group having 1 to 5 carbon atoms, and R ^d8 , R ^d9 , R ^d10 , R ^d11 and R ^d12 , respectively. Independently, it indicates an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms).

In the formula (d1), B is an alkandiyl group having 1 to 20 carbon atoms such as a methylene group, an ethylene group, a trimethylene group, a tetramethylene group, a hexamethylene group, a heptamethylene group and an octamethylene group; a cyclobutylene group (for example, a cyclobutylene group). 1,2-Cyclobutylene group), cyclopentylene group (eg 1,2-cyclopentylene group), cyclohexylene group (eg 1,2-cyclohexylene group), cyclooctylene group (eg 1,2-cyclobutylene group) A divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms such as a cyclooctylene group), or an alcandiyl group thereof and −CH ₂₋ constituting the alicyclic hydrocarbon group is −O− or Indicates a group substituted with −CO−. Preferred B is an alkanediyl group having 1 to 10 carbon atoms. Rd7 represents an alkyl group having 1 to 5 carbon atoms such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an s-butyl group, a t-butyl group, and a pentyl group, and R ^d8 , R ^d9 , and R ^d10. , ^{R d11} and ^{R d12} are each independently said ^{R 21} exemplary of alkyl groups of 1 to 5 carbon atoms, or a methoxy group, an ethoxy group, a propoxy group, i- propoxy, butoxy, s- butoxy group, It shows an alkoxy group having 1 to 5 carbon atoms such as a t-butoxy group. Preferred R ^d8 , R ^d9 , R ^d10 , R ^d11 and R ^d12 are independently alkoxy groups having 1 to 5 carbon atoms, respectively. These silane compounds (D) can be used alone or in combination of two or more.

Specific examples of the silane compound represented by the above formula (d1) include (trimethoxysilyl) methane, 1,2-bis (trimethoxysilyl) ethane, 1,2-bis (triethoxysilyl) ethane, and the like. 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 (tripropoxysilyl) hexane, 1,8-bis (trimethoxysilyl) octane, 1,8-bis (triethoxysilyl) octane, 1,8-bis (tripropoxysilyl) octane and other bis (tri-C1- 5 alkoxysilyl) C1-10 alkane; 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 , 1,8-Bis (dimethoxyethylsilyl) octane and other bis (diC1-5 alkoxy C1-5 alkylsilyl) C1-10 alkanes; 1,6-bis (methoxydimethylsilyl) hexane, 1,8-bis ( Examples thereof include bis (mono C1-5 alkoxy-di C1-5 alkylsilyl) C1-10 alkanes such as methoxydimethylsilyl) octane. Of these, 1,2-bis (trimethoxysilyl) ethane, 1,3-bis (trimethoxysilyl) propane, 1,4-bis (trimethoxysilyl) butane, 1,5-bis (trimethoxysilyl) Bis (tri-C1-3 alkoxysilyl) C1-10 alkanes such as pentane, 1,6-bis (trimethoxysilyl) hexane, and 1,8-bis (trimethoxysilyl) octane are preferable, and 1,6-bis is particularly preferable. (Trimethoxysilyl) hexane and 1,8-bis (trimethoxysilyl) octane are preferable.

The content of the silane compound (D) is usually 0.01 to 10 parts by mass, preferably 0.03 to 5 parts by mass, based on 100 parts by mass of the (meth) acrylic resin (A). It is preferably 0.05 to 2 parts by mass, and more preferably 0.1 to 1 part by mass. When it is not more than the above upper limit value, it is advantageous to suppress bleed-out of the silane compound (A) from the pressure-sensitive adhesive layer, and when it is more than the above lower limit value, the pressure-sensitive adhesive layer is adhered to a metal layer, a glass substrate or the like. It becomes easy to improve the property (or adhesiveness), which is advantageous for improving the peeling resistance and the like.

The pressure-sensitive adhesive composition may further contain an antistatic agent.
Examples of the antistatic agent include a surfactant, a siloxane compound, a conductive polymer, an ionic compound and the like, and an ionic compound is preferable. Examples of the ionic compound include conventional ones. Examples of the cation component constituting the ionic compound include organic cations and inorganic cations. Examples of the organic cation include pyridinium cation, pyrrolidinium cation, piperidinium cation, imidazolium cation, ammonium cation, sulfonium cation, phosphonium cation and the like. Examples of the inorganic cation 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, pyridinium cations, imidazolium cations, pyrrolidinium cations, lithium cations, and potassium cations are preferable from the viewpoint of compatibility with (meth) acrylic resins. The anion component constituting the ionic compound may be either an inorganic anion or an organic anion, but an anion component containing a fluorine atom is preferable from the viewpoint of antistatic performance. Examples of the anion component containing a fluorine atom include hexafluorophosphate anion (PF _6- ), bis (trifluoromethanesulfonyl) imide anion [(CF ₃ SO ₂ ) ₂ N-], and bis (fluorosulfonyl) imide anion [(FSO). ₂ ) ₂ N-], tetra (pentafluorophenyl) borate anion [(C ₆ F ₅ ) ₄ B-] and the like. These ionic compounds can be used alone or in combination of two or more. In particular, bis (trifluoromethanesulfonyl) imide anion [(CF ₃ SO ₂ ) ₂ N-], bis (fluorosulfonyl) imide anion [(FSO ₂ ) 2 N-], tetra (pentafluorophenyl) borate anion [(C ₆₎ F ₅ ) ₄ B-] is preferable.
An ionic compound that is solid at room temperature is preferable in terms of stability over time in the antistatic performance of the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition.

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 with respect to 100 parts by mass of the (meth) acrylic resin (A). It is mass.

The pressure-sensitive adhesive composition may contain one or more additives such as a solvent, a cross-linking catalyst, a tack fire, a plasticizer, a softening agent, a pigment, a rust preventive, an inorganic filler, and light-scattering fine particles.

[Middle layer]
The optical laminate of the present invention includes an intermediate layer 300. In the optical laminate of the present invention, the light selective absorbing agent contained in the light selective absorbing pressure-sensitive adhesive layer 20 is contained by having the intermediate layer 300 interposed between the polarizer 10 and the light selective absorbing pressure-sensitive adhesive layer 20. Has the effect of suppressing the transfer of light to the polarizer 10. However, the intermediate layer 300 has only one or a plurality of layers selected from the group consisting of a liquid crystal curing layer, an alignment layer, and a bonding layer, and is not configured to completely block the transmission of the light selective absorber. Since there is no such thing, the suppressive effect is not sufficient. In the optical laminate of the present invention, by adjusting the absorbance of the light selective absorption pressure-sensitive adhesive layer, it is possible to suppress color loss at the end of the polarizer under high temperature and high humidity.

Although the thickness of the intermediate layer 300 is not limited, it is preferably 1 μm or more and 200 μm or less, and 5 μm or more and 200 μm or less from the viewpoint of suppressing the migration of the light selective absorbent contained in the light selective absorption pressure-sensitive adhesive layer. ..

The intermediate layer 300 preferably does not contain a light selective absorber from the viewpoint of suppressing color loss in the polarizer 10, and when it contains a light selective absorber, the content of the light selective absorber per unit area. Is preferably 0.5 g / m ² or less.

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

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.
Examples of the retardation layer, which is a cured product of the polymerizable liquid crystal compound, include the first form to the fifth form.
First form: a retardation layer in which the rod-shaped liquid crystal compound is oriented horizontally with respect to the supporting base material Second form: a retardation layer in which the rod-shaped liquid crystal compound is oriented in the direction perpendicular to the supporting base material Third form : A retardation layer in which the direction of orientation of the rod-shaped liquid crystal compound changes spirally in the plane Fourth form: A retardation layer in which the disk-shaped liquid crystal compound is obliquely oriented Fifth form: The disk-shaped liquid crystal compound Biaxial retardation layer oriented perpendicular to the supporting substrate For example, as an optical laminate used for an organic electroluminescence display, the first form, the second form, and the fifth form are preferable. Used. Alternatively, the retardation layers of these forms may be laminated and used.

The retardation layer preferably has anti-wavelength dispersibility. The inverse wavelength dispersibility is an optical characteristic in which the liquid crystal alignment in-plane retardation value at a short wavelength is smaller than the liquid crystal alignment in-plane retardation value at a long wavelength, and the retardation layer is preferably expressed by the following equation. (7) and equation (8) are satisfied. Re (λ) represents an in-plane retardation value with respect to light having 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 has the first form and anti-wavelength dispersibility, it is preferable because coloring at the time of black display on the display device is reduced, and 0.82 in the above formula (7). More preferably, ≤Re (450) / Re (550) ≤0.93. Further, 120 ≦ Re (550) ≦ 150 is preferable.

As a polymerizable liquid crystal compound used for forming a retardation layer, "3.8.6 network (completely crosslinked type)" of the Liquid Crystal Handbook (edited by the Liquid Crystal Handbook Editorial Committee, published on October 30, 2000 by Maruzen Co., Ltd.) ) ”,“ 6.5.1 Liquid crystal material b. Polymerizable nematic liquid crystal material ”, compounds having a polymerizable group, and JP-A-2010-31223, JP-A-2010-270108. In Japanese Patent Application Laid-Open No. 2011-6360, Japanese Patent Application Laid-Open No. 2011-207765, Japanese Patent Application Laid-Open No. 2011-162678, Japanese Patent Application Laid-Open No. 2016-81035, International Publication No. 2017/043438, and Japanese Patent Application Laid-Open No. 2011-207765. Examples thereof include the above-mentioned polymerizable liquid crystal compounds.
Examples of the method for producing the retardation layer from the polymer in the oriented state of the polymerizable liquid crystal compound include the methods described in JP-A-2010-31223.

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 or more and 10 μm or less, preferably 0.5 μm or more and 8 μm or less, and more preferably 1 μm or more and 6 μm or less. is there.

The retardation layer is a λ / 4 retardation layer that imparts a phase difference of 1/4 wavelength to transmitted light, a λ / 2 retardation layer that imparts a phase difference of 1/2 wavelength to transmitted light, and a positive A plate. , And can be a positive C plate. When the first liquid crystal curing layer 30 and the second liquid crystal curing layer 31 are included as in the optical laminate 101 shown in FIG. 2, the combination of the first liquid crystal curing layer 30 and the second liquid crystal curing layer 31 is at the λ / 2 position. Examples thereof include a combination of a retardation layer and a λ / 4 retardation layer, a combination of a λ / 4 retardation layer and a positive C layer, and the like.

The optical laminate of the present invention may be configured as a circularly polarizing plate having a λ / 4 retardation layer. The circular polarizing plate can be used as an antireflection polarizing plate.

[Orientation layer]
The alignment layer has an orientation regulating force for aligning the liquid crystal compound contained in the liquid crystal cured layer formed on the alignment layer in a desired direction. Examples of the oriented layer include an oriented polymer layer formed of an oriented polymer, a photo-aligned polymer layer formed of a photo-aligned polymer, and a grub-aligned layer having an uneven pattern or a plurality of grubs (grooves) on the layer surface. it can. The thickness of the alignment layer is usually 0.01 to 10 μm, preferably 0.01 to 5 μm.

The oriented polymer layer can be formed by applying a composition in which the oriented polymer is dissolved in a solvent to the base material layer to remove the solvent, and if necessary, rubbing treatment. In this case, the orientation regulating force can be arbitrarily adjusted in the orientation polymer layer formed of the orientation polymer depending on the surface condition of the orientation polymer and the rubbing conditions.

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 base material layer and irradiating it with polarized light. In this case, in the photo-alignment polymer layer, the orientation-regulating force can be arbitrarily adjusted depending on the polarization irradiation conditions of the photo-alignment polymer.

The grub alignment layer is active on a plate-shaped master having grooves on the surface, for example, a method of forming a concavo-convex pattern by exposure, development, etc. through an exposure mask having a pattern-shaped slit on the surface of a photosensitive polyimide film. A method of forming an uncured layer of an energy ray-curable resin, transferring this layer to a base material layer and curing it, forming an uncured layer of an active energy ray-curable resin on the base material layer, and forming this layer on the base material layer. It can be formed by a method of forming irregularities and hardening them by pressing a roll-shaped master having irregularities or the like.

The base material layer is preferably a film formed of a resin material. As the resin material, for example, a resin material having excellent transparency, mechanical strength, thermal stability, stretchability and the like is used. Specifically, polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic acid, poly (meth) methyl acrylate and the like. (Meta) acrylic acid resin; cellulose ester resin such as triacetyl cellulose, diacetyl cellulose and cellulose acetate propionate; vinyl alcohol resin such as polyvinyl alcohol and polyvinyl acetate; polycarbonate resin; polystyrene resin; poly Arilate-based resin; polysulfone-based resin; polyether sulfone-based resin; polyamide-based resin; polyimide-based resin; polyether ketone-based resin; polyphenylene sulfide-based resin; polyphenylene oxide-based resin, and mixtures and copolymers thereof. Can be done. Among these resins, it is preferable to use any one of cyclic polyolefin-based resin, polyester-based resin, cellulose ester-based resin and (meth) acrylic acid-based resin, or a mixture thereof. The above-mentioned "(meth) acrylic acid" means "at least one of acrylic acid and methacrylic acid".

The base material layer may be a single layer obtained by mixing one or more of the above resins, or may have a multilayer structure of two or more layers. When having a multi-layer structure, the resins forming each layer may be the same or different.

Any additive may be added to the resin material forming the resin film. Examples of the additive include a light selective absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, an antioxidant, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a coloring agent.

The thickness of the base material layer is not particularly limited, but is generally preferably 5 to 200 μm, more preferably 10 to 200 μm, and 10 to 150 μm from the viewpoint of workability such as strength and handleability. Is even more preferable.

In order to improve the adhesion between the base material layer and the alignment layer, at least the surface of the base material layer on the side where the alignment layer is formed may be subjected to corona treatment, plasma treatment, flame treatment, etc., and a primer layer or the like may be applied. It may be formed. The base material layer may be peeled off from the layer structure composed of the base material layer / alignment layer / liquid crystal curing layer, and the alignment layer / liquid crystal curing layer may be used as a component of the intermediate layer of the present invention, or the base material layer / alignment layer may be used. May be peeled off to use the liquid crystal cured layer as a component of the intermediate layer of the present invention.

[Lated layer]
The intermediate layer 300 can include a laminating layer for joining the two layers. Examples of the bonding layer include an adhesive layer and a pressure-sensitive adhesive layer (hereinafter, also referred to as “second pressure-sensitive adhesive layer”). The optical laminate 101 shown in FIG. 2 has an adhesive layer 33 that is interposed between the first liquid crystal cured layer 30 and the second liquid crystal cured layer 31 and joins them, and an adhesive layer of the first liquid crystal cured layer 30. It includes a second pressure-sensitive adhesive layer 32 laminated on the surface opposite to 33.

For the adhesive layer, a water-based adhesive, an active energy ray-curable adhesive, a thermosetting adhesive, or the like is used. The thickness of the adhesive layer is, for example, 10 nm or more and 20 μm or less, preferably 100 nm or more and 10 μm or less, and more preferably 500 nm or more and 5 μm or less.

The second pressure-sensitive adhesive layer may be composed of the same pressure-sensitive adhesive composition as the pressure-sensitive adhesive composition forming the above-mentioned light-selective absorbing pressure-sensitive adhesive layer, and may be composed of (meth) acrylic-based, rubber-based, urethane-based, or the like. It may be composed of a pressure-sensitive adhesive composition (hereinafter, also referred to as “second pressure-sensitive adhesive composition”) containing a resin as a main component, such as an ester-based, silicone-based, or polyvinyl ether-based resin. As the second pressure-sensitive adhesive composition, a pressure-sensitive adhesive composition using a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer is suitable. The second pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type. The thickness of the second pressure-sensitive adhesive layer is, for example, 0.1 to 150 μm, usually 8 to 60 μm, and is preferably 30 μm or less, more preferably 20 μm or less in terms of thinning.

The second pressure-sensitive adhesive layer preferably does not contain a light selective absorber from the viewpoint of suppressing color loss in the polarizer 10, and when it contains a light selective absorber, it is per unit area of the light selective absorber. It is preferably 0.5 parts by mass or less with respect to 100 parts by mass of all resin components.

<Manufacturing method of optical laminate>
The optical laminates 100, 101, and 102 can be manufactured by a method including a step of laminating the constituent layers to each other via a laminating layer. It may also include a step of peeling off a layer that is not a constituent layer. When the layers are bonded to each other via the bonding layer, it is preferable to perform a surface activation treatment such as a corona treatment on one or both of the bonding surfaces in order to improve the adhesion.

<Optical laminate>
The optical laminate of the present invention has a planar shape, and its area is, for example, 30 mm × 30 mm to 180 mm × 90 mm. The optical laminate of the present invention may be a rectangle such as a rectangle or a square, a shape having a notch portion in which a part of the side constituting the rectangle is cut out, a semicircular shape, or a through hole in the plane. It may be a so-called irregular shape such as a shape having. When the outer shape of the optical laminate has a straight side, the absorption axis of the polarizer constituting the optical laminate may be parallel to the side, orthogonal to the side, or diagonally, for example. They may intersect at an angle of 45 °. When the optical laminate has a retardation layer and the retardation layer has an in-plane slow-phase axis, the slow-phase axis and the absorption axis of the polarizer constituting the optical laminate intersect at 45 °. It may intersect at 15 °, or at 75 °.

<Image display device>
The optical laminates 100, 101, and 102 are arranged on the front surface (visual side) of the image display panel and can be used as a component of the image display device. The optical laminate, which is a circularly polarizing plate, can also be used as an antireflection polarizing plate that imparts an antireflection function in an image display device. The image display device is not particularly limited, and examples thereof include an image display device such as an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electric field emission display device.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. Unless otherwise specified, "%" and "parts" in Examples and Comparative Examples are "% by mass" and "parts by mass".

[Manufacturing of single-sided protective polarizing plate]
(Making a polarizer)
A polyvinyl alcohol film having a thickness of 20 μm, a degree of polymerization of 2400, and a degree of saponification of 99% or more was uniaxially stretched on a thermal roll at a stretching ratio of 4.1 times, and while maintaining a tense state, iodine was 0.05 per 100 parts by weight of water. It was immersed in a dyeing bath containing 5 parts by weight of potassium iodide and 5 parts by weight at 28 ° C. for 60 seconds.

Then, it was immersed in an aqueous boric acid solution 1 containing 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. Then, it was immersed in boric acid aqueous solution 2 containing 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. Then, it was washed with pure water at 10 ° C. and dried to obtain a polarizer. The thickness of the obtained polarizer was 8 μm, and the boron content was 4.3% by weight.

(Adjustment of water-based adhesive)
In 100 parts by weight of water, 3 parts by mass of carboxyl group-modified polyvinyl alcohol (Kurare Co., Ltd., trade name "KL-318") is dissolved, and a polyamide epoxy additive (Taoka Chemical Industry Co., Ltd.), which is a water-soluble epoxy resin, is dissolved in the aqueous solution. A water-based adhesive was prepared by adding 1.5 parts by mass of a trade name "Smiley's Resin (registered trademark) 650 (30), an aqueous solution having a solid content concentration of 30% by weight).

(Protective film A and release film B)
As the protective film A, a film having a hard coat layer having a thickness of 3 μm formed on a stretched film made of a norbornene resin having a thickness of 25 μm (manufactured by Nippon Paper Industries, Ltd., trade name “COP25ST-HC”) was used.
As the release film B, a triacetyl cellulose film (manufactured by FUJIFILM Corporation, "TD80UL") was used. The thickness of the release film was 80 μm, and the moisture permeability was 502 g / m 2.24 hr.

(Manufacturing of single-sided protective polarizing plate)
The produced polarizer was continuously conveyed, the protective film A was continuously unwound from the roll of the protective film A, and the release film B was continuously unwound from the roll of the release film B. A water-based adhesive is injected between the polarizer and the corona-treated protective film A, and pure water is injected between the polarizer and the release film B, and the film is passed through a bonding roll to adhere the protective film A / water-based adhesive. A laminated film composed of an agent / polarizer / pure water / release film B was obtained. The laminated film is transported and heat-treated at 80 ° C. for 300 seconds in a drying furnace to dry the water-based adhesive and volatilize and remove the pure water interposed between the polarizer and the release film B. A single-sided protective polarizing plate with a release film was obtained. The release film B was peeled from the single-sided protective polarizing plate with a release film to obtain a single-sided protective polarizing plate.

[Manufacturing of retardation laminate]
(Preparation of "alignment layer / first liquid crystal cured layer")
A λ / 4 retardation layer (first liquid crystal cured layer) formed on the base film and obtained by curing the alignment layer and the nematic liquid crystal compound was prepared. The total thickness of the "aligned layer / first liquid crystal cured layer" was 2 μm.

(Preparation of "Orientation layer / Second liquid crystal cured layer")
As a composition for forming an oriented layer, 10.0 parts by mass of polyethylene glycol di (meth) acrylate (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., A-600) and trimethylolpropan triacrylate (manufactured by Shin-Nakamura Chemical Industry Co., Ltd.) A-TMPT) 10.0 parts by mass, 1,6-hexanediol di (meth) acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., A-HD-N) 10.0 parts by mass, and Irgacure as a photopolymerization initiator 1.50 parts by mass of 907 (Irg-907, manufactured by BASF) was dissolved in 70.0 parts by mass of the solvent methyl ethyl ketone to prepare a coating liquid for forming an orientation layer.

A long cyclic olefin resin (COP) film (manufactured by Nippon Zeon Corporation) with a thickness of 20 μm is prepared as a base film, and a coating liquid for forming an alignment layer is applied to one side of the base film with a bar coater. did.

After the coating layer after coating is heat-treated at a temperature of 80 ° C. for 60 seconds, it is ^{irradiated with ultraviolet rays (UVB) at 220 mJ / cm 2} to polymerize and cure the composition for forming an orientation layer to form a base film. An oriented layer having a thickness of 2.3 μm was formed on the top.

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

A coating liquid for forming a retardation layer was applied onto the previously obtained alignment layer, and the coating layer was heat-treated at a temperature of 80 ° C. for 60 seconds. Then, ultraviolet rays (UVB) are ^{irradiated at 220 mJ / cm 2} to polymerize and cure the composition for forming a retardation layer, and a retardation layer (second liquid crystal curing layer) having a thickness of 0.7 μm is formed on the alignment layer. Formed. In this way, an "aligned layer / second liquid crystal cured layer" having a total thickness of 3 μm was obtained on the base film.

(Manufacturing of retardation laminate)
The "alignment layer / first liquid crystal curing layer" laminated on the base film and the "alignment layer / second liquid crystal curing layer" laminated on the base film are combined with an ultraviolet curable adhesive (thickness 1 μm). As a result, each liquid crystal cured layer surface (the surface opposite to the base film) was bonded so as to be a bonding surface. Next, the ultraviolet curable adhesive was cured by irradiating with ultraviolet rays to prepare a retardation laminate including two liquid crystal curable layers, a first liquid crystal curable layer and a second liquid crystal curable layer.

[Preparation of light-selective absorbent adhesive layer]
(Adjustment of acrylic resin (A-1))
A mixed solution of 86.4 parts of ethyl acetate, 61.9 parts of butyl acrylate, and 1.9 parts of 2-hydroxyethyl acrylate was charged as a solvent in a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer, and a stirrer. , The internal temperature was raised to 60 ° C. while replacing the air in the apparatus with nitrogen gas to make it oxygen-free. Then, a total amount of a solution prepared by dissolving 0.4 part of azobisisobutyronitrile (polymerization initiator) in 10 parts of ethyl acetate was added. The resulting mixture was held at 60 ° C. for 1 hour, then ethyl acetate was continuously added into the reaction vessel at an addition rate of 17.3 parts / hr while maintaining the internal temperature at 50-70 ° C. to increase the concentration of the acrylic resin. When the concentration reached 35%, the addition of ethyl acetate was stopped, and the temperature was kept at this temperature until 12 hours had passed from the start of the addition of ethyl acetate. Finally, ethyl acetate was added to adjust the concentration of the acrylic resin to 20%, and an ethyl acetate solution of the acrylic resin was prepared. The obtained acrylic resin had a polystyrene-equivalent weight average molecular weight Mw of 600,000 and Mw / Mn of 7.0 by GPC. This is referred to as an acrylic resin (A-1). The glass transition temperature by DSC was −52.9 ° C.

(Preparation of adhesive layer (1))
In an ethyl acetate solution (resin concentration: 20%) of an acrylic resin (A-1), 0.5 part of a cross-linking agent (coronate L, solid content 75%: manufactured by Toso) with respect to 100 parts of the solid content of the solution. , Silane compound (manufactured by Shin-Etsu Chemical Industry Co., Ltd .: KBM-403), and Synthesis Example 2 described in paragraph [0142] of JP-A-2019-007001, described as the photoselective absorption compound (2) below. 2.5 parts of the compound (photoselective absorber) represented by the formula (aa2) was mixed, and 2-butanone was further added so that the solid content concentration became 14% to obtain the pressure-sensitive adhesive composition (1). It was. The blending amount of the cross-linking agent (Coronate L) is the number of parts by mass as the active ingredient.

The pressure-sensitive adhesive composition (1) prepared above is dried on the release-treated surface of the polyethylene terephthalate film (SP-PLR382050 manufactured by Lintec Corporation, hereinafter abbreviated as "separator") that has been subjected to the release treatment. The pressure-sensitive adhesive layer was applied using an applicator so that the thickness of the pressure-sensitive adhesive layer was 17 μm, and dried at 100 ° C. for 1 minute to prepare a pressure-sensitive adhesive layer. The obtained pressure-sensitive adhesive layer was designated as a pressure-sensitive adhesive layer (1). Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (1).

(Preparation of adhesive layer (2))
The pressure-sensitive adhesive layer (2) was prepared by the same method as the pressure-sensitive adhesive layer (1) except that the blending amount of the light selective absorber was 3.7 parts. Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (2).

(Preparation of adhesive layer (3))
The pressure-sensitive adhesive layer (3) was prepared by the same method as the pressure-sensitive adhesive layer (1) except that the blending amount of the light selective absorber was 5.4 parts. Table 1 shows the content of the light selective absorber per unit area of the pressure-sensitive adhesive layer (3).

[Preparation of second adhesive layer]
In an ethyl acetate solution (resin concentration: 20%) of the above acrylic resin (A-1), 0.5 part of a cross-linking agent (coronate L, solid content 75%: manufactured by Tosoh) and a silane compound (manufactured by Shin-Etsu Chemical Industry: KBM-) 403) 0.5 parts were mixed, and 2-butanone was further added so that the solid content concentration became 14% to obtain a pressure-sensitive adhesive composition. The blending amount of the cross-linking agent (Coronate L) is the number of parts by mass as the active ingredient.

The pressure-sensitive adhesive composition was applied to the release-treated surface of the separator used to prepare the light-selective absorbent pressure-sensitive adhesive layer using an applicator so that the thickness of the pressure-sensitive adhesive layer after drying was 5 μm, and at 100 ° C. It was dried for 1 minute to prepare a second pressure-sensitive adhesive layer.

[Preparation of optical laminate]
(Examples 1 and 3)
A second pressure-sensitive adhesive layer was attached to the polarizer side of the prepared single-sided protective polarizing plate, and the separator was peeled off. On the surface from which the separator of the second pressure-sensitive adhesive layer was peeled off, the surface of the produced retardation laminate was bonded by peeling off the base film on the side of the first liquid crystal cured layer. Then, the base film on the second liquid crystal curing layer side was peeled off, and the pressure-sensitive adhesive layer shown in Table 1 was bonded as a light-selective absorbing pressure-sensitive adhesive layer on the surface of the alignment layer on the second liquid crystal curing layer side. Layer structure of "protective film A / water-based adhesive / polarizer / second pressure-sensitive adhesive layer / alignment layer / first liquid crystal curing layer / second liquid crystal curing layer / alignment layer / optical selective absorption pressure-sensitive adhesive layer / separator" An optical laminate was obtained. In such an optical laminate, the intermediate layer had a layer structure of "second pressure-sensitive adhesive layer / alignment layer / first liquid crystal curing layer / second liquid crystal curing layer / alignment layer", and the total thickness was 11 μm. ..

In the above, the pressure-sensitive adhesive layer was applied using an applicator so that the thickness of the pressure-sensitive adhesive layer was 5 μm, and dried at 100 ° C. for 1 minute to prepare a second pressure-sensitive adhesive layer. The total thickness of the "aligned layer / first liquid crystal cured layer" was 2 μm. The total thickness of the "aligned layer / second liquid crystal cured layer" was 3 μm. The UV curable adhesive had a thickness of 1 μm.

(Examples 2 and 4, and Comparative Example 1)
A second pressure-sensitive adhesive layer was attached to the polarizer side of the prepared single-sided protective polarizing plate, and the separator was peeled off. The pressure-sensitive adhesive layer shown in Table 1 is bonded to the surface of the second pressure-sensitive adhesive layer from which the separator has been peeled off as a light-selective absorbent pressure-sensitive adhesive layer, and "protective film A / water-based adhesive / polarizer / second pressure-sensitive adhesive" is attached. An optical laminate having a layer structure of "layer / light-selective absorbent adhesive layer / separator" was obtained. In such an optical laminate, the intermediate layer was composed of a "second pressure-sensitive adhesive layer" and its thickness was 5 μm.

In the above, the pressure-sensitive adhesive layer was applied using an applicator so that the thickness of the pressure-sensitive adhesive layer was 5 μm, and dried at 100 ° C. for 1 minute to prepare a second pressure-sensitive adhesive layer.

[Measurement of absorbance of adhesive layer]
The pressure-sensitive adhesive layer (3) is bonded to the glass from the pressure-sensitive adhesive layer (1), the separator is peeled off, and then a cycloolefin polymer (COP) film (ZF-14 manufactured by Nippon Zeon Co., Ltd.) is attached to the pressure-sensitive adhesive layer. Then, a laminate for evaluating the pressure-sensitive adhesive layer was prepared. The laminate for evaluating the pressure-sensitive adhesive layer was set on a spectrophotometer UV-2450 (manufactured by Shimadzu Corporation), and the absorbance was measured in the wavelength range of 300 to 800 nm in 1 nm steps by the double beam method. Table 1 shows the absorbance of the prepared pressure-sensitive adhesive layer at a wavelength of 410 nm. The absorbance of the glass and the absorbance of the COP film at a wavelength of 410 nm are both 0.

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

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

[Moisture resistance test and observation of color loss]
The separators of the optical laminates obtained in Examples 1 to 4 and Comparative Example 1 were peeled off, bonded to a non-alkali glass plate, and then left to stand in an environment of a temperature of 65 ° C. and a humidity of 90% RH for 500 hours. Then, a polarizing plate having a cross-nicol relationship was attached to a non-alkali glass surface opposite to the tested optical laminate, observed with an optical microscope, and the observed image was stored. As the optical microscope, "VHX-500" manufactured by KEYENCE CORPORATION was used. FIG. 4 shows an example of an observation image with an optical microscope. In FIG. 4, when observed along the straight line indicated by the arrow inward from the end 50 of the optical laminate (the straight line extending vertically from the end 50), the color loss region 51 and the region where color loss does not occur are observed. It can be seen that there is (non-color loss region) 52.

[Measurement of color loss by image processing]
The image observed with a microscope was converted into black-and-white 256 gradations (0 to 255) using image analysis software "ImageJ (free software)". As a method of converting to black and white 256 gradations (0 to 255), a method of averaging RGB values was used. FIG. 5 shows an example of the converted data. The midpoint between the color loss region 51 and the non-color loss region 52 (middle of the color loss gradation) in the gradation profile in the direction perpendicular to the end 50 of the optical laminate (arrow in FIG. 4) is the color loss of the optical laminate. As the end portion (FIG. 5), the distance (μm) from the end portion 50 of the optical laminate to the color loss end portion was measured as the color loss distance. Table 1 shows the color loss distance of the optical laminate. The smaller the color loss distance, the narrower the color loss range and the better the moisture resistance and heat resistance.

10 Polarizer, 11 Protective film, 20 Light selective absorption adhesive layer, 30 1st liquid crystal curing layer, 31 2nd liquid crystal curing layer, 32 2nd adhesive layer, 33 Adhesive layer, 50 Edges of optical laminate , 51 color loss area, 52 non-color loss area, 100, 101, 102 optical laminate, 300 intermediate layer.

Claims (10)

An optical laminate having a polarizer, a light-selective-absorbing pressure-sensitive adhesive layer, and an intermediate layer laminated in contact with the polarizer and the light-selective-absorbing pressure-sensitive adhesive layer.
The intermediate layer has only one or more layers selected from the group consisting of a liquid crystal cured layer, an oriented layer, and a bonded layer.
Iodine is adsorbed and oriented in the polarizer, and the boron content is 5.0% by mass or less.
The light selective absorption pressure-sensitive adhesive layer is an optical laminate containing a light selective absorption agent and having an absorbance at a wavelength of 410 nm of 0.1 or more and 2.3 or less. The optical laminate according to claim 1, further comprising a protective film laminated on the side opposite to the intermediate layer side of the polarizer. The optical laminate according to claim 1 or 2, wherein the light selective absorbing pressure-sensitive adhesive layer has a content of the light selective absorbing agent per unit area of 0.01 g / m ² or more and 5 g / m ^{2 or less.} The light selective absorbing pressure-sensitive adhesive layer comprises 0.1 part by mass or more and 10 parts by mass or less of the light selective absorbing agent with respect to 100 parts by mass of all the resin components contained in the light selective absorbing pressure-sensitive adhesive layer. The optical laminate according to any one of 1 to 3. The optical laminate according to any one of claims 1 to 4, wherein the light selective absorption pressure-sensitive adhesive layer has a thickness of 0.1 μm or more and 150 μm or less. The optical laminate according to any one of claims 1 to 5, wherein the light selective absorber is an organic light selective absorber having a molecular weight of 100 or more and 3000 or less. The optical laminate according to any one of claims 1 to 6, wherein the intermediate layer has a λ / 4 retardation layer which is a liquid crystal curing layer. The optical laminate according to any one of claims 1 to 7, which is an antireflection polarizing plate. An image display device including an image display panel and the optical laminate according to claim 8 arranged on the front surface of the image display panel. The image display device according to claim 9, wherein the image display panel is an organic EL display panel.

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