TW202134060A - Optical laminate and image display device - Google Patents

Abstract

An objective 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.

An optical laminate according to the present invention has a polarizer, a light-selective absorbing pressure-sensitive adhesive layer, and an intermediate layer laminated between and in contact with the polarizer and the light-absorbing pressure-sensitive adhesive layer. The intermediate layer 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. The polarizer has iodine adsorbed and oriented therein, and contains boron with an content ratio of 5.0% by mass or less. The light-selective absorbing pressure-sensitive adhesive layer contains a light-selective absorbing agent, and has an absorbance of 0.1 or more and 2.3 or less at a wavelength of 410 nm.

Description

Optical laminated body and image display device

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

The polarizing plate formed by laminating a protective film on one side or two areas of the polarizer is an optical member, which is widely used in liquid crystal display devices such as portable devices and TVs or organic electroluminescence (organic EL) displays Video display devices such as devices have been widely used in various portable devices such as mobile phones, smart phones, and tablet terminals in particular in recent years.

Most polarizing plates are bonded to image display elements (liquid crystal cells or organic EL display elements, etc.) via an adhesive (pressure-sensitive adhesive, also known as pressure-sensitive adhesive) layer and used (for example, Japanese Patent Application Publication No. 2010-229321) Bulletin (Patent Document 1)). Therefore, the polarizing plate is sometimes circulated in the market in the form of a polarizing plate with an adhesive layer pre-installed on one side of the adhesive layer.

In addition, portable machines are often used in harsh environments with high temperature and humidity, and high durability is required for polarizers. Japanese Patent Laid-Open No. 2013-105036 (Patent Document 2) describes that by increasing the boric acid content in the polarizer and generating a large amount of boric acid crosslinks, the I ₃ complexes can be obtained with high alignment and high stability. A polarizer with excellent durability at low temperature and high humidity that suppresses blue leakage.

[Prior Technical Literature]

[Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 2010-229321.

Patent Document 2: JP 2013-105036 A.

The polarizing plate has the problem that it is easy to fade at the end of the polarizer in a high temperature and high humidity environment. This problem is more pronounced in a configuration in which a protective film is laminated to a single-area layer of a polarizer. Although there is a known method for suppressing the discoloration of the polarizer by increasing the boron content in the polarizer, the use of this method has the problem of easy shrinkage due to heating.

The object of the present invention is to provide a novel optical laminate in which the discoloration at the end of the polarizer is suppressed under high temperature and high humidity.

The present invention provides the optical laminate exemplified below and an image display device using the optical laminate.

[1] An optical laminate having a polarizer, a light-selectively absorbing adhesive layer, and between the polarizer and the light-selectively absorbing adhesive layer, and the polarizer and the light-absorbing adhesive layer The middle layer of layered layers next to each other, in which,

The aforementioned intermediate layer has only one layer or a plurality of layers selected from the group consisting of a liquid crystal hardening layer, an alignment layer, and a bonding layer,

The aforementioned polarizer system has iodine adsorption and alignment, and the boron content is 5.0% by mass or less,

The aforementioned light selective absorbing adhesive layer contains a light selective absorbing agent and has an absorbance at a wavelength of 410 nm of 0.1 or more and 2.3 or less.

[2] The optical laminate as described in [1], which further has a protective film, and the protective film is laminated on the opposite side of the polarizer from the intermediate layer side.

[3] The optical laminate according to [1] or [2], wherein, in the light selective absorbing adhesive layer, the content per unit area of the light selective absorbing agent is 0.01 g/m ² or more and 5 g/m2. m ² or less.

[4] The optical laminate according to any one of [1] to [3], wherein the light selective absorbing adhesive layer is based on 100 parts by mass of all resin components contained in the light selective absorbing adhesive layer The agent layer contains 0.1 parts by mass or more and 10 parts by mass or less of the aforementioned light selective absorber.

[5] The optical laminate according to any one of [1] to [4], wherein the thickness of the light-selectively absorbing adhesive layer is 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 with 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 belonging to the liquid crystal hardened layer.

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

[9] An image display device comprising an image display panel and the optical laminate described in [8] arranged on the front surface 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 discoloration at the end of a polarizer is suppressed under a high-temperature and high-humidity environment, and an image display device containing the optical laminate.

10: Polarizer

11: Protective film

20: Light selective absorption adhesive layer

30: The first liquid crystal hardened layer

31: The second liquid crystal hardening layer

32: The second adhesive layer

33: Adhesive layer

50: The end of the optical laminate

51: faded area

52: non-fading area

100, 101, 102: optical laminate

300: middle layer

Fig. 1 is a schematic cross-sectional view showing an example of the optical laminate of the present invention.

Fig. 2 is a schematic cross-sectional view showing an example of the optical laminate of the present invention.

Fig. 3 is a schematic cross-sectional view showing an example of the optical laminate of the present invention.

Fig. 4 is a diagram showing an example of an observation image of an optical microscope.

FIG. 5 is a diagram showing an example of data obtained by converting an observation image into 256 levels of black and white.

Hereinafter, the 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 following drawings, the scale is appropriately adjusted to show each constituent element for easy understanding, and the scale of each constituent element shown in the drawings may not necessarily match the scale of the actual constituent element.

<Optical Laminate>

The optical laminated system of the present invention has a polarizer, a light-selectively absorbing adhesive layer, and between the polarizer and the light-selectively absorbing adhesive layer and in contact with the polarizer and the light-absorbing adhesive layer. The middle layer of the buildup. An example of the layer structure of the optical laminate of the present invention is shown in FIG. 1, FIG. 2, and FIG. 3.

Fig. 1 is a schematic cross-sectional view of an example of the optical laminate of the present invention. The optical laminate 100 shown in FIG. 1 has a protective film 11, a polarizer 10, an intermediate layer 300, and a light selective absorption adhesive layer (hereinafter, also referred to as "first adhesive layer") 20 in this order. The intermediate layer 300 has only one layer or a plurality of layers selected from the group consisting of a liquid crystal hardening layer, an alignment layer, and a bonding 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 absorption adhesive layer 20 in this order. The intermediate layer 300 has a second adhesive layer 32, a first liquid crystal hardening layer 30, an adhesive layer 33, and a second liquid crystal hardening 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 absorption adhesive layer 20 in this order. The intermediate layer 300 is composed of the second adhesive layer 32.

The thickness of the optical laminates 100, 101, 102 varies depending on the functions required for the optical laminates and the use of the optical laminates, so there is no particular limitation, but for example, it is 5 μm or more and 200 μm or less, and may be 10 μm or more and 150 μm or less. It may be 120 μm or less.

The light selective absorption adhesive layer contains a light selective absorption agent. In the optical layered body of the present invention, at least the light-selectively absorbing adhesive layer has light selective absorption performance, so that the entire optical layered body has light selective absorption performance. Therefore, when the optical laminate of the present invention is used on an image display element, it has the function of protecting the image display element from ultraviolet rays.

The optical laminate of the present invention may have a structure including a layer having light selective absorption properties in addition to the light selective absorption adhesive layer. Examples of other layers include the protective film 11 and the intermediate layer 300. In the present invention, the light selective absorption adhesive layer has light selective absorption performance and helps to show the light selective absorption performance of the entire optical laminate, which can improve the design freedom of light selective absorption performance in other layers . For example, in order to improve the light selective absorption performance, the protective film 11 needs to have a thicker design. However, by increasing the design freedom of the light selective absorption performance, the protective film 11 can be made thinner. For example, from the viewpoint of suppressing discoloration at the end of the polarizer under high temperature and high humidity, the intermediate layer 300 is preferably a structure that does not substantially contain a light selective absorber, and even when it is contained, its content is preferably 0.5 g/m ² or less. When the intermediate layer 300 has a second adhesive layer, the second adhesive layer is also preferably a configuration that does not substantially contain a light selective absorber, and even when it contains, its content is preferably 0.5 g/m ² or less.

The inventors of the present invention have found that there is a correlation between the content of the light selective absorber contained in the adhesive layer and the degree of discoloration at the end of the polarizer under high temperature and high humidity. Based on this knowledge, it is considered that the light selective absorber in the light selective absorbing adhesive layer is likely to transfer to the polarizer side under high temperature and high humidity, and this transfer is one of the main causes of color fading. The inventors of the present invention made further studies and found that even when the light-selectively absorbing adhesive layer contains a light-selective absorbing agent, by adjusting the layer position and absorbance of the light-selectively absorbing adhesive layer, the polarization under high temperature and humidity can be suppressed. Discoloration of the end of the sheet, thereby completing the present invention.

[Polarizer]

The polarizer has the following properties: it absorbs linearly polarized light with a vibrating plane parallel to its absorption axis, and makes linearly polarized light with a vibrating plane orthogonal to the absorption axis (parallel to the penetration axis) penetrate. The polarizer 10 in the optical laminate of the present invention has iodine adsorbed and aligned, and the boron content is 5.0% by mass or less.

By setting the boron content to 5.0% by mass or less, preferably 4.5% by mass or less, shrinkage due to heating can be suppressed. The boron content is preferably 0.5% by mass or more, more preferably 1% by mass or more. In the polarizer 10, the lower the boron content, the more likely it is to fade at the end of the polarizer under high temperature and high humidity. The boron in the polarizer 10 increases the degree of cross-linking of the polarizer 10 and helps to stably maintain iodine in the polarizer 10. Therefore, if the content of boron decreases, the iodine cannot be maintained stably, resulting in discoloration. In the present invention, even if the boron content of the polarizer 10 is 5.0% by mass or less, discoloration under high temperature and high humidity can be suppressed.

Examples of the polarizer 10 include a stretched film or stretched layer on which a dichroic dye having absorption anisotropy is adsorbed, a cured product containing a polymerizable liquid crystal compound, and a liquid crystal cured layer with a dichroic dye. Dichroic pigments are pigments whose absorbance in the direction of the long axis of the molecule and the absorbance in the direction of the short axis are different, and iodine is suitable for the pigment.

(1) It belongs to the polarizer of the stretched film or stretched layer that adsorbs the pigment with absorption anisotropy

Polarizers belonging to stretched films that adsorb pigments with absorption anisotropy can usually be manufactured through the following steps: a step of uniaxially stretching a polyvinyl alcohol-based resin film; dyeing polyvinyl alcohol with dichroic pigments such as iodine A step of using a resin film to adsorb the dichroic pigment; a step of treating the polyvinyl alcohol resin film adsorbed with a dichroic pigment with an aqueous solution of boric acid; and a step of washing with water after the treatment with the aqueous solution of boric acid.

The thickness of the polarizer is generally 30 μm or less, preferably 15 μm or less, more preferably 13 μm or less, still more preferably 10 μm or less, 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 resin is obtained by saponifying a polyvinyl acetate resin. In addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, polyvinyl acetate resins can also be copolymers of vinyl acetate and other monomers copolymerizable with vinyl acetate. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acid-based compounds, olefin-based compounds, vinyl ether-based compounds, unsaturated sulfonate-based compounds, and (meth)acrylamide-based compounds having an ammonium group.

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

The polarizers belonging to the extension layer which adsorbs the pigment with absorption anisotropy can usually be manufactured through the following steps: the step of coating the coating liquid containing the above-mentioned polyvinyl alcohol-based resin on the base film; The step of axis extension; the step of dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminate film with dichroic pigments such as iodine, thereby adsorbing the dichroic pigment and forming a polarizer; treating the adsorbed material with an aqueous solution of boric acid The step of dichroic pigment film; and the step of washing with water after treatment with boric acid aqueous solution. The base film used to form the polarizer can also be used as the protective film 11. If necessary, the base film can 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 can be made of an optically transparent thermoplastic resin, such as: cyclic polyolefin resin; cellulose acetate resin including resins such as cellulose triacetate and cellulose diacetate; including polyethylene terephthalate , Polyethylene naphthalate, polybutylene terephthalate and other resins such as polyester resins; polycarbonate resins; (meth)acrylic resins; polypropylene resins, one or two of these A coating or film composed of a mixture of more than one species. The protective film 11 may contain a light selective absorber described later. In addition, the light selective absorber contained in the protective film 11 is held in the protective film 11, so it is difficult to transfer to the polarizer.

A hard coat layer can be formed on the protective film 11. The hard coat layer may be formed on one side of the protective film 11, or may be formed on both sides. By providing the hard coat layer, the protective film 11 with improved hardness and scratch resistance can be formed. The hard coat layer may be, for example, a cured layer of acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, epoxy resin, or the like. In order to increase the strength, the hard coat layer may contain additives. The additives are not limited, and include inorganic fine particles, organic fine particles, or mixtures of these. The hard coat layer is, for example, a cured layer of ultraviolet curable resin. Examples of ultraviolet curable resins include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins.

The thickness of the protective film is usually 1 to 100 μm, and from the viewpoint of strength or handling properties, it is preferably 5 to 80 μm, more preferably 8 to 60 μm, and still more preferably 12 to 45 μm.

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

[Light selective absorption adhesive layer]

The adhesive composition is dissolved or dispersed in an organic solvent to form a diluted solution, and the diluted solution is coated on the substrate and dried, thereby forming the light selective absorption adhesive layer 20. The base material is suitably a plastic film, and specifically, a release film that has been subjected to a mold release treatment can be mentioned. The release film can include a film made of resin such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyarylate, etc., which has been subjected to a mold release treatment such as silicone treatment on one side. By.

The thickness of the light selective absorption adhesive layer is, for example, 0.1 μm or more and 150 μm or less. When layered 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 layered with other optical films such as 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, preferably 3 μm or more, for example, 10 μm Above, from the viewpoint of further thinning, it is preferably 10 μm or less, and particularly preferably 7 μm or less.

The absorbance at a wavelength of 410 nm of the light-selectively absorbing adhesive layer is preferably 0.1 or more and 2.3 or less, more preferably 0.2 or more and 2.0 or less. The reason for this is that by providing the light selective absorption adhesive layer 20 with such an absorbance, the entire optical laminate can exhibit the desired light selective absorption performance, and the entire optical laminate can be easily configured to be thin.

In the light selective absorption adhesive layer,

The absorbance at a wavelength of 390nm is usually 5.0 or less, but may also be 4.5 or less, the absorbance at a wavelength of 400nm is usually 5.0 or less, and may also be 4.5 or less, and the absorbance at a wavelength of 420nm is usually 1.00 or less, preferably 0.60 or less, more preferably Is 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, and 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.

By setting the absorbance at the individual wavelengths in the above range, light in the ultraviolet region can be fully absorbed, and light in the visible light region can be directly transmitted.

The content of the light selective absorbing agent per unit area of the light selective absorbing adhesive layer is preferably 0.01 g/m ² or more and 5 g/m ² or less. By setting it in this range, it is possible to suppress the discoloration of the polarizer which is generated under high temperature and high humidity.

In the optical laminate, the light-selectively absorbing adhesive layer 20 may be provided on the outermost surface, and the optically-selectively absorbing adhesive layer 20 may be configured to adhere the optical laminate to the adhesive body.

[Adhesive composition]

The adhesive composition contains a resin and a light selective absorber, and preferably further contains a crosslinking agent.

The resin is, for example, a resin mainly composed of (meth)acrylic, rubber, urethane, ester, silicone, and polyvinyl ether resins. Among them, a resin containing (meth)acrylic resin (A) as a main component is preferred.

(Light selective absorber)

The light selective absorber is one that selectively absorbs light of a specific wavelength, and preferably contains a compound having at least one absorption maximum at a wavelength of 360 nm to 420 nm, and more preferably contains a compound having an absorption maximum at 380 nm to 410 nm.

A light selective absorber containing a compound having an absorption maximum in the vicinity of a wavelength of 350 nm (hereinafter, sometimes referred to as light selective absorber (A)) includes, for example, an oxybenzophenone-based light selective absorber, benzotriazole Organic light selective absorbers such as light selective absorbers, salicylate light selective absorbers, benzophenone light selective absorbers, cyanoacrylate light selective absorbers, triazine light selective absorbers, etc. . More specifically, for example, 5-chloro-2-(3,5-disecond-butyl-2-hydroxyphenyl)-2H-benzotriazole, (2-2H-benzotriazole-2- Base)-6-(linear and side-chain dodecyl)-4-methylphenol, 2-hydroxy-4-benzyloxybenzophenone, 2,4-benzyloxydiphenyl Ketones and so on. 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.

Commercially available light selective absorbers (A) can be used. For example, triazine-based light selective absorbers include "Kemisorb 102" manufactured by CHEMIPRO KASEI Co., Ltd., "ADK STAB LA46" manufactured by ADEKA Co., Ltd., and "ADK STAB LAF70", "TINUVIN 109", "TINUVIN 171", "TINUVIN 234", "TINUVIN 326", "TINUVIN 327", "TINUVIN 328", "TINUVIN 928", "TINUVIN 400", and "TINUVIN 109" manufactured by BASF JAPAN TINUVIN 460", "TINUVIN 405", "TINUVIN 477", etc. Benzotriazole-based light selective absorbers include "ADK STAB LA31" and "ADK STAB LA36" manufactured by ADEKA Co., Ltd., and "Sumisorb 200", "Sumisorb 250" and "Sumisorb 300" manufactured by Sumika Chemtex Co., Ltd. ”, “Sumisorb 340” and “Sumisorb 350”, “Kemisorb 74”, “Kemisorb 79” and “Kemisorb 279” manufactured by CHEMIPRO KASEI Co., Ltd., “TINUVIN 99-2”, “TINUVIN 900” manufactured by BASF, and "TINUVIN 928" and so on.

In addition, the light selective absorber (A) may be an inorganic light selective absorber. Inorganic light selective absorbers 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), ATO (antimony doped tin oxide) and so on. Examples of the titanium oxide-based composite oxide include titanium oxide doped with silicon dioxide and aluminum oxide. These inorganic light selective absorbers can be used singly or in combination of two or more. In addition, an organic light selective absorber and an inorganic light selective absorber may be used in combination.

A light selective absorber containing a compound having an absorption maximum near a wavelength of 405 nm (hereinafter, sometimes referred to as light selective absorber (B)) is preferably a compound satisfying the following formula (5), more preferably, it also satisfies the following The compound of formula (6).

ε(405)≧20 (5)

[In formula (5), ε(405) represents the gram absorbance coefficient of the compound at a wavelength of 405 nm.

The unit of gram absorbance coefficient is L/(g‧cm))

ε(405)/ε(440)≧20 (6)

[In formula (6), ε(405) represents the gram absorbance coefficient of the compound at a wavelength of 405 nm, and ε(440) represents the gram absorbance coefficient of the compound at a wavelength of 440 nm].

In addition, the gram absorbance coefficient was measured by the method described in the examples.

A compound with a larger ε(405) value is more likely to absorb light with a wavelength of 405nm, thereby suppressing degradation of the optical laminate and image display device in ultraviolet or short-wavelength visible light. When the ε(405) value is less than 20L/(g·cm), if the content of the light selective absorber (B) in the adhesive composition is not increased, it will be difficult for the retardation film or the organic EL light-emitting element to exhibit the inhibitory factor The tendency to deteriorate the function caused by ultraviolet or short-wavelength visible light. The value of ε(405) is preferably 20L/(g‧cm) or more, It is more preferably 30L/(g‧cm) or more, still more preferably 40L/(g‧cm) or more, usually 500L/(g‧cm) or less.

A compound with a larger ε(405)/ε(440) value can absorb light near 405nm without hindering the color performance of the image display device, and suppress the light degradation of display devices such as retardation films or organic EL elements. The value of ε(405)/ε(440) is preferably 20 or more, more preferably 40 or more, still more preferably 70 or more, particularly preferably 80 or more.

The compound that selectively absorbs light with a wavelength of 405 nm is preferably a compound containing a merocyanine structure in the molecule. The molecular weight of the compound containing a merocyanidin structure in the molecule is preferably 100 or more and 3000 or less. A compound containing a merocyanine structure in the molecule is a compound containing a partial structure shown in -(NC=CC=C)- in the molecule, such as merocyanine-based compounds, cyanine-based compounds, indole Dole-based compounds, benzotriazole-based compounds, etc. Preferred are merocyanin-based compounds, cyanine-based compounds, and benzotriazole-based compounds, and more preferred are compounds represented by formula (I).

[In the formula, R ¹ and R ⁵ each independently represent a hydrogen atom, an alkyl group having 1 to 25 carbons that may have a substituent, an aralkyl group having 7 to 15 carbons that may have a substituent, and an aralkyl group having 6 to 15 carbons. _{The aryl group, heterocyclic group, and -CH 2} -contained in the alkyl group or aralkyl group may be substituted with -NR ^1A -, -CO-, -SO ₂ -, -O- or -S-.

R ^1A represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

R ² , R ³ and R ⁴ each independently represent a hydrogen atom, an optionally substituted alkyl group having 1 to 6 carbon atoms, an optionally substituted aromatic hydrocarbon group, or an optionally substituted aromatic heterocyclic group, which _{The -CH 2} -contained in the alkyl group may be ^{substituted with -NR 1B} -, -CO-, -SO ₂ -, -O- or -S-.

R ^1B represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

R ⁶ and R ⁷ each 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 can be connected to each other to form a ring structure, R ² and R ³ can be connected to each other to form a ring structure, R ² and R ⁴ can be connected to each other to form a ring structure, R ³ and R ⁶ can be connected to each other to form a ring structure].

The alkyl groups having 1 to 25 carbon atoms represented by R ¹ and R ⁵ include methyl, ethyl, n-propyl, isopropyl, 2-cyanopropyl, n-butyl, tertiary butyl, and Dibutyl, n-pentyl, n-hexyl, 1-methylbutyl, 3-methylbutyl, n-octyl, n-decyl, 2-hexyl-octyl, etc.

Examples of the substituents that the alkyl group having 1 to 25 carbons represented by R ¹ and R ^{5 may have include the groups described in Group A below.}

Group A: Examples include nitro group, hydroxyl group, carboxyl group, sulfonic acid group, cyano group, amino group, halogen atom, alkoxy group having 1 to 6 carbon atoms, alkylsilyl group having 1 to 12 carbon atoms, and 2 carbon atoms. Alkylcarbonyl to 8, *-R ^a1 -(OR ^a2 ) _t1 -R ^a3 (R ^a1 and R ^a2 each independently represent an alkanediyl group with carbon numbers 1 to 6, and R ^a3 represents a carbon number from 1 to 6 is an alkyl group, t1 represents an integer from 1 to 3) and the like.

Alkylsilyl groups with 1 to 12 carbon atoms include monoalkylsilyl groups such as methylsilyl, ethylsilyl, and propylsilyl; dimethylsilyl, diethylsilyl, methyl ethyl Dialkylsilyl such as base silicon; Trialkylsilyl such as trimethylsilyl, triethylsilyl, and tripropylsilyl.

The alkylcarbonyl group having 2 to 8 carbon atoms includes methylcarbonyl and ethylcarbonyl.

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 benzyl and phenylethyl.} The group in which -CH ₂ -contained in the aralkyl group has been substituted with -SO ₂ -or -COO- includes 2-phenethyl ethyl group and the like.

Examples of the substituents that the aralkyl group having 7 to 15 carbon atoms represented by R ¹ and R ^{5 may have include the groups described in the above group A.}

The aryl group having 6 to 15 carbon atoms represented by R ¹ and R ^{5 includes phenyl, naphthyl, onion and the like.}

Examples of the substituents that the aryl group having 6 to 15 carbon atoms represented by R ¹ and R ^{5 may have include the groups described in the above group A.}

The heterocyclic groups with 6 to 15 carbon atoms represented by R ¹ and R ⁵ include pyridyl, pyrrolidinyl, quinolinyl, thienyl, imidazolyl, oxazolyl, pyrrolyl, thiazolyl, and furyl Aromatic heterocyclic groups with 3 to 9 carbon atoms.

The alkyl groups with 1 to 6 carbon atoms represented by R ^1A and R ^1B include methyl, ethyl, n-propyl, isopropyl, n-butyl, tertiary butyl, sec-butyl, and n-pentyl. , N-hexyl and so on.

The alkyl group having 1 to 6 carbon atoms represented by R ² , R ³ and R ⁴ may be the same as the alkyl group having 1 to 6 carbon atoms represented by ^{R 1B.}

Examples of the substituents that the alkyl group having 1 to 6 carbon atoms represented by R ² , R ³ and R ^{4 may have include the groups described in the above group A.}

Examples of the aromatic hydrocarbon groups represented by R ² , R ³ and R ⁴ include aryl groups having 6 to 15 carbon atoms such as phenyl, naphthyl, and onion; and 7 to 15 carbon atoms such as benzyl and phenylethyl. The aralkyl group.

Examples of the substituents that the aromatic hydrocarbon group represented by R ² , R ³ and R ^{4 may have include the groups described in the above group A.}

The aromatic heterocycles represented by R ² , R ³ and R ⁴ include carbons such as pyridyl, pyrrolidinyl, quinolinyl, thienyl, imidazolyl, oxazolyl, pyrrolyl, thiazolyl, and furanyl. Aromatic heterocyclic group of 3 to 9.

Examples of the substituents that the aromatic heterocyclic ring represented by R ² , R ³ and R ^{4 may have include the groups described in the above group A.}

The alkyl group having 1 to 25 carbon atoms represented by R ⁶ and R ⁷ may be the same as the alkyl group having 1 to 25 carbon atoms represented by ^{R 1} and R ^5.

Examples of the substituents that the alkyl group having 1 to 25 carbons represented by R ⁶ and R ^{7 may have include the groups described in the above group A.}

The alkyl group having 1 to 25 carbon atoms represented by R ⁶ and R ⁷ may be the same as the alkyl group having 1 to 25 carbon atoms represented by ^{R 1} and R ^5.

The electron withdrawing group represented by R ⁶ and R ⁷ includes, for example, 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).

*-X ¹ -R ¹¹ (I-1)

[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 represents -CO-, -COO-, -OCO-, -CS-, -CSO-, -CSS-, -NR ¹² CO- or -CONR ¹³ -.

R ¹² and R ¹³ each 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 by halogen atoms include, for example, trifluoromethyl, perfluoroethyl, perfluoropropyl, perfluoroisopropyl, perfluorobutyl, perfluorosecond butyl, perfluorotertiary butyl, Perfluoroalkyl groups such as perfluoropentyl and perfluorohexyl. The number of carbon atoms in the alkyl group substituted with a halogen atom is usually 1-25.

R ⁶ and R ⁷ can be connected to each other to form a ring structure. The ring structure formed by R ⁶ and R ⁷ may include, for example, Meldrum's acid structure, barbituric acid structure, and 5,5-dimethyl-1 , 3-cyclohexanedione (dimedone) structure and so on.

The alkyl group having 1 to 25 carbon atoms represented by R ¹¹ may be the same as the alkyl group represented by ^{R 1} and R ^5.

The ring structure formed by R ² and R ^{3 being} bonded to each other is a ^{nitrogen-containing ring structure containing a nitrogen atom bonded to R 2} , for example, a 4- to 14-membered nitrogen-containing heterocyclic ring. The ring structure formed by connecting R ² and R ^{3 to} each other may be a monocyclic ring or a polycyclic ring. Specific examples include pyrrolidine ring, pyrroline ring, imidazoline ring, imidazoline ring, oxazoline ring, thiazoline ring, piperidine ring, morpholine ring, piperazine ring, indole ring, isoindole Ring and so on.

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

The ring structure formed by bonding R ² and R ^{4 to} each other includes a nitrogen-containing ring structure of 4 to 14 members, and preferably a nitrogen-containing ring structure of 5 to 9 members. The ring structure formed by R ² and R ⁴ bonding to each other may be a single ring or a polycyclic ring. These rings may have substituents, and examples of the ring structure are the same as those exemplified for the ring structure formed by ^{R 2} and R ^{3 described above.}

The ring structure formed by connecting R ³ and R ^{6 to} each other is a ring structure in which R ³ -C=CC=CR ⁶ forms the skeleton of the ring. For example, phenyl etc. can be mentioned.

The compound represented by formula (I) in which R ² and R ^{3 are} connected to each other to form a ring structure may include the compound represented by formula (IA), and R ² and R ^{4 are} connected to each other to form formula (I) in which a ring structure is formed The compounds shown include compounds represented by formula (IB) and the like.

[In formula (IA) and formula (IB), R ¹ , R ³ , R ⁴ , R ⁵ , R ⁶ and R ⁷ respectively have the same meaning as above.

Ring W ¹ and ring W ² each independently represent a nitrogen-containing ring].

The ring W ¹ and the ring W ² represent a nitrogen-containing ring containing a nitrogen atom as a structural unit of the ring. The ring W ¹ and the ring W ² may each independently be a monocyclic ring or a polycyclic ring, and may contain heteroatoms other than nitrogen as a structural unit of the ring. Preferably, the ring W ¹ and the ring W ² are independently 5-membered to 9-membered rings.

The compound represented by formula (I-A) is preferably a compound represented by formula (I-A-1).

[In the formula (IA-1), R ¹ , R ⁴ , R ⁵ , R ⁶ and R ⁷ each have the same meaning as above.

A ¹ represents -CH ₂ -, -O-, -S- or -NR ^1D -.

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].

The compound represented by formula (I-B) is preferably a compound represented by formula (I-B-1) and a compound represented by formula (I-B-2).

[In the formula (IB-1), R ¹ , R ⁶ and R ⁷ each have the same meaning as above.

R ¹⁶ each independently represents a hydrogen atom or an alkyl group or aryl group having 1 to 12 carbon atoms].

[In the formula (IB-2), R ³ , R ⁵ , R ⁶ and R ⁷ each have the same meaning as above.

R ³⁰ represents a hydrogen atom, a cyano group, a nitro group, a halogen atom, a mercapto group, an amino group, an alkyl group with 1 to 12 carbons, an alkoxy group with 1 to 12 carbons, an aromatic hydrocarbon group with 6 to 18 carbons, and carbon An acyl group having 2 to 13 carbons, an acyloxy group having 2 to 13 carbons, or alkoxycarbonyl having 2 to 13 carbons.

R ³¹ represents an alkyl group having 1 to 12 carbons, an alkoxy group having 1 to 12 carbons, a mercapto group, an alkylthio group having 1 to 12 carbons, an amine group or a heterocyclic group which may have a substituent].

The halogen atom represented by R ³⁰ includes a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

Examples of the acyl group having 2 to 13 carbons represented by R ^{30 include acetyl, propionyl and butyryl.}

The acyloxy group having 2 to 13 carbon atoms represented by ^{R 30 includes methylcarbonyloxy, ethylcarbonyloxy, propylcarbonyloxy, and butylcarbonyloxy.}

The alkoxycarbonyl group having 2 to 13 carbon atoms represented by R ³⁰ includes a methoxycarbonyl group, an ethoxycarbonyl group, a propoxycarbonyl group, a butoxycarbonyl group and the like.

The aromatic hydrocarbon groups with 6 to 18 carbons represented by R ³⁰ include aryl groups with 6 to 18 carbons such as phenyl, naphthyl, and biphenyl; and carbon 7 to 18 such as benzyl and phenylethyl 18 of the aralkyl group.

The alkyl group having 1 to 12 carbons represented by R ³⁰ may be the same as the alkyl group having 1 to 12 carbons represented by ^{R 14.}

The alkyl group having 1 to 12 carbons represented by R ³⁰ includes methoxy, ethoxy, propoxy, butoxy, pentoxy and the like.

R ^{30 is} preferably an alkyl group having 1 to 12 carbons, an alkoxy group having 1 to 12 carbons, an amino group, or a mercapto group.

The alkyl group having 1 to 12 carbons represented by R ³¹ may be the same as the alkyl group having 1 to 12 carbons represented by ^{R 14.}

The alkoxy group having 1 to 12 carbons represented by R ³¹ may be the same as the alkoxy group having 1 to 12 carbons represented by ^{R 30.}

The ^{alkylthio group having 1 to 12 carbon atoms represented by R 31} includes methylthio, ethylthio, propylthio, butylthio, pentylthio, hexylthio and the like.

The amine group represented by R ³¹ that may have a substituent includes: amine group; N-methylamino group, N-ethylamino group, etc., substituted by an alkyl group with 1 to 8 carbon atoms; N , N-dimethylamino, N,N-diethylamino, N,N-methylethylamino and other amino groups substituted by 2 alkyl groups with 1 to 8 carbon atoms, etc.

Examples of the heterocyclic ring represented by R ³¹ include nitrogen-containing heterocyclic groups having 4 to 9 carbon atoms such as pyrrolidinyl, piperidinyl, and morpholinyl.

The compound represented by formula (I) in which R ³ and R ^{6 are} connected to each other to form a ring structure, and R ² and R ^{4 are} bonded to each other to form a ring structure may include compounds represented by formula (IC) and the like.

[In formula (IC), R ¹ , R ⁶ and R ^{7 have} the same meaning as above.

R ²¹ and R ²² each independently represent a hydrogen atom, an alkyl group having 1 to 12 carbons, or a hydroxyl group.

X ² and X ³ each independently represent -CH ₂ -or -N(R ²⁵ )=.

R ²⁵ represents a hydrogen atom, an alkyl group having 1 to 25 carbon atoms, and an optionally substituted aromatic hydrocarbon group].

The alkyl group having 1 to 25 carbon atoms represented by R ²⁵ may be the same as the alkyl group having 1 to 25 carbon atoms represented by ^{R 1.}

The aromatic hydrocarbon group represented by R ²⁵ includes aryl groups such as phenyl and naphthyl; aralkyl groups such as benzyl and phenylethyl; biphenyl groups, etc., preferably aromatic with 6 to 20 carbon atoms Hydrocarbyl. Examples of the substituent that the aromatic hydrocarbon group represented by R ^{25 may have include a hydroxyl group and the like.}

Preferably, R ³ and R ⁶ are each independently an electron withdrawing group.

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

[In the formula (ID), R ⁴ , R ⁵ , and R ^{7 have} the same meaning as above.

R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ each independently represent a hydrogen atom, an optionally substituted alkyl group having 1 to 12 carbons, a hydroxyl group, and an aralkyl group].

The alkyl group having 1 to 12 carbons represented by R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ may be the same as the alkyl group having 1 to 12 carbons represented by ^{R 1A} and R ^1B. Examples of the substituent that the alkyl group having 1 to 12 carbons represented by R ²⁵ , R ²⁶ , R ²⁷ and R ^{28 may have include a hydroxyl group.}

The aralkyl groups represented by R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ include aralkyl groups having 7 to 15 carbon atoms such as benzyl group and phenylethyl group.

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

[In formula (IE), R ¹ , R ² , R ³ , R ⁴ , and R ⁵ have the same meanings as above.

Ring W ³ represents a cyclic compound].

The ring W ³ is a 5-membered to 9-membered ring, and may contain heteroatoms such as a nitrogen atom, an oxygen atom, and a sulfur atom as a constituent unit of the ring.

The compound represented by formula (I-E) is preferably a compound represented by formula (IE-1).

[In the formula (IE-1), R ¹ , R ² , R ³ and R ⁵ each have the same meaning as above.

R ¹⁷ , R ¹⁸ , R ¹⁹ , and R ^q each independently represent a hydrogen atom or an optionally substituted alkyl, aralkyl, or aryl group with 1 to 12 carbon atoms, and -CH contained in the alkyl group or aralkyl group _{The 2} -group can be substituted by -NR ^1D -, -C(=O)-, -C(=S)-, -O-, -S-, R ¹⁷ and R ¹⁸ can 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. m, p, q each independently represent an integer from 0 to 3].

The compounds represented by formula (I) include the following compounds.

The total content of the light selective absorber is not limited if it is selected so that the absorbance of the adhesive layer at a wavelength of 410 nm becomes 0.1 or more and 2.3 or less, but in the adhesive composition, for example, relative to 100 parts by mass of the total resin composition 0.01 to 20 parts by mass, preferably 0.05 to 15 parts by mass, more preferably 0.1 to 10 parts by mass.

The mass ratio of the light selective absorber (A) to the light selective absorber (B) (the light selective absorber (A)/the light selective absorber (B)) is usually 0.05 to 20, preferably 0.1 to 10.

((Meth) acrylic resin (A))

The (meth)acrylic resin (A) is preferably a polymer having a structural unit derived from (meth)acrylate as a main component (preferably containing 50% by mass or more). The structural unit derived from (meth)acrylate may contain more than one structural unit derived from a monomer other than (meth)acrylate (for example, a structural unit derived from a monomer having a polar functional group). In addition, in this specification, (meth)acrylic acid means either acrylic acid or methacrylic acid, and the same applies to "(meth)" in the case of (meth)acrylate and the like.

(Meth)acrylates include (meth)acrylates represented by the following formula (X).

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

In formula (X), R ^{102 is} preferably an alkyl group having 1 to 14 carbons, and more preferably an alkyl group having 1 to 8 carbons.

The (meth)acrylate represented by formula (X) can include:

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) Base) linear alkyl esters of (meth)acrylic acid such as lauryl acrylate and stearyl (meth)acrylate;

Isopropyl (meth)acrylate, isobutyl (meth)acrylate, tertiary butyl (meth)acrylate, isoamyl (meth)acrylate, isohexyl (meth)acrylate, (meth)acrylic acid 2-ethylhexyl ester, isooctyl (meth)acrylate, isononyl (meth)acrylate, isostearyl (meth)acrylate, isoamyl (meth)acrylate, etc. (meth)acrylic acid Branched alkyl ester;

Cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, adamantyl (meth)acrylate, dicyclopentyl (meth)acrylate, cyclododecyl (meth)acrylate, (meth)acrylate Base) methylcyclohexyl acrylate, trimethylcyclohexyl (meth)acrylate, tert-butylcyclohexyl (meth)acrylate, α-ethoxycyclohexyl acrylate, etc. (meth)acrylic acid Alkyl ester containing alicyclic skeleton;

Phenyl (meth)acrylate and other (meth)acrylic acid esters containing aromatic ring skeletons, etc.

In addition, a substituent-containing alkyl (meth)acrylate in which the alkyl group in the alkyl (meth)acrylate has a substituent is introduced. The substituent of the alkyl (meth)acrylate containing a substituent is a group that can replace the hydrogen atom of the alkyl group, and specific examples thereof include a phenyl group, an alkoxy group, and a phenoxy group. Specific examples of alkyl (meth)acrylates containing substituents include 2-methoxyethyl (meth)acrylate, ethoxymethyl (meth)acrylate, and phenoxyethyl (meth)acrylate. Ester, 2-(2-phenoxyethoxy) ethyl (meth)acrylate, phenoxy diethylene glycol (meth)acrylate, phenoxy poly(ethylene glycol) (meth)acrylate, etc. .

These (meth)acrylates may be used alone, respectively, or a different plural number may be used.

The (meth)acrylic resin (A) preferably contains a structural unit derived from an alkyl acrylate (a1) whose glass transition temperature Tg of a homopolymer is less than 0°C, and Tg derived from a homopolymer is A structural unit of alkyl acrylate (a2) above 0°C. Contains structural units derived from alkyl acrylate (a1) and structural units derived from alkyl acrylate (a2), which is beneficial to increase the high temperature of the adhesive layer Durability. The Tg of the homopolymer of (meth)acrylic acid alkyl ester can adopt literature values such as POLYMER HANDBOOK (Wiley-Interscience), for example.

Specific examples of alkyl acrylate (a1) can include ethyl acrylate, n- and isopropyl acrylate, n- and isobutyl acrylate, n-pentyl acrylate, n- and isohexyl acrylate, n-heptyl acrylate, n- and isopropyl acrylate Octyl ester, 2-ethylhexyl acrylate, n- and isononyl acrylate, n- and isodecyl acrylate, n-dodecyl acrylate and other alkyl acrylates with alkyl carbon numbers of 2-12 or so.

The alkyl acrylate (a1) may be used alone or in combination of two or more kinds. Among them, from the viewpoint of followability or reworkability when laminating the adhesive of the present invention on an optical laminate, n-butyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, etc. are preferred.

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

The alkyl acrylate (a2) may be used alone or in combination of two or more. Among them, from the viewpoint of high-temperature durability, the alkyl acrylate (a2) preferably contains methyl acrylate, cyclohexyl acrylate, isobornyl acrylate, etc., and more preferably contains methyl acrylate.

Among all the structural units contained in the (meth)acrylic resin, the structural unit derived from the (meth)acrylate represented by the formula (X) is preferably 50% by mass or more, more preferably 60 to 95% by mass %, and more preferably 65 to 95% by mass or more.

The structural unit derived from a monomer other than (meth)acrylate is preferably a structural unit derived from a monomer having a polar functional group, and more preferably a structural unit derived from (former) having a polar functional group Group) The structural unit of acrylate. Examples of the polar functional group include heterocyclic groups such as a hydroxyl group, a carboxyl group, a substituted or unsubstituted amino group, and an epoxy group.

Monomers with polar functional groups can include:

1-hydroxymethyl (meth)acrylate, 1-hydroxyethyl (meth)acrylate, 1-hydroxyheptyl (meth)acrylate, 1-hydroxybutyl (meth)acrylate, (meth)acrylate 1 -Hydroxypentyl ester, 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-hydroxypropyl (meth)acrylate Hydroxyhexyl ester, 3-hydroxyheptyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 4-hydroxypentyl (meth)acrylate, 4-hydroxyhexyl (meth)acrylate, (meth)acrylate Base) 4-hydroxyheptyl acrylate, 4-hydroxyoctyl (meth)acrylate, 2-chloro-2-hydroxypropyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, 5-hydroxypentyl (meth)acrylate, 5-hydroxyhexyl (meth)acrylate, 5-hydroxyheptyl (meth)acrylate, 5-hydroxyoctyl (meth)acrylate, 5-hydroxynonyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 6-hydroxyheptyl (meth)acrylate, 6 (meth)acrylate -Hydroxyoctyl ester, 6-hydroxynonyl (meth)acrylate, 6-hydroxydecyl (meth)acrylate, 7-hydroxyheptyl (meth)acrylate, 7-hydroxyoctyl (meth)acrylate, ( 7-hydroxynonyl meth)acrylate, 7-hydroxydecyl (meth)acrylate, 7-hydroxyundecyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, (meth)acrylic acid 8-hydroxynonyl ester, 8-hydroxydecyl (meth)acrylate, 8-hydroxyundecyl (meth)acrylate, 8-hydroxydodecyl (meth)acrylate, 9-(meth)acrylate Hydroxynonyl ester, 9-hydroxydecyl (meth)acrylate, 9-hydroxyundecyl (meth)acrylate, 9-hydroxydodecyl (meth)acrylate, 9-hydroxydecyl (meth)acrylate Trialkyl ester, 10-hydroxydecyl (meth)acrylate, 10-(meth)acrylate Hydroxyundecyl ester, 10-hydroxydodecyl (meth)acrylate, 10-hydroxytridecyl acrylate, 10-hydroxytetradecyl (meth)acrylate, 11-hydroxydecyl (meth)acrylate Monoalkyl ester, 11-hydroxydodecyl (meth)acrylate, 11-hydroxytridecyl (meth)acrylate, 11-hydroxytetradecyl (meth)acrylate, 11-hydroxytetradecyl (meth)acrylate Hydroxypentadecyl ester, 12-hydroxydodecyl (meth)acrylate, 12-hydroxytridecyl (meth)acrylate, 12-hydroxytetradecyl (meth)acrylate, (meth)acrylic acid 13-hydroxypentadecyl ester, 13-hydroxytetradecyl (meth)acrylate, 13-hydroxypentadecyl (meth)acrylate, 14-hydroxytetradecyl (meth)acrylate, (methyl) ) Monomers with hydroxyl groups such as 14-hydroxypentadecyl acrylate, 15-hydroxypentadecyl (meth)acrylate, 15-hydroxyheptadecanyl (meth)acrylate, etc.;

(Meth)acrylic acid, carboxyalkyl (meth)acrylate (e.g. carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate), maleic acid, maleic anhydride, fumaric acid, crotonic acid, etc. have a carboxyl group The monomer;

Acrylic morpholine, vinyl caprolactam, N-vinyl-2-pyrrolidone, vinyl pyridine, tetrahydrofurfuryl (meth)acrylate, caprolactone modified tetrahydrofurfuryl acrylate, ( Monomers with heterocyclic groups such as 3,4-epoxycyclohexyl methyl meth)acrylate, glycidyl (meth)acrylate, 2,5-dihydrofuran;

Monomers with substituted or unsubstituted amino groups such as (meth)aminoethyl acrylate, N,N-dimethylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, etc. .

Among them, from the viewpoint of the reactivity between the (meth)acrylate polymer and the crosslinking agent, a monomer having a hydroxyl group or/and a monomer having a carboxyl group are preferred, and a monomer having a hydroxyl group and Both monomers with carboxyl groups.

The monomer having a hydroxyl group is preferably 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 5-hydroxypentyl acrylate, and 6-hydroxyhexyl acrylate. In particular, good durability can be obtained by using 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, and 5-hydroxypentyl acrylate.

The monomer having a carboxyl group is preferably acrylic acid.

From the viewpoint of preventing the peeling force of the separation film that can be laminated on the outer surface of the adhesive layer from increasing, the (meth)acrylic resin (A) preferably does not substantially contain a structure derived from a monomer having an amine group unit. Here, the fact that it is not contained substantially means that it is 0.1 parts by mass or less in 100 parts by mass of all the structural units constituting the (meth)acrylic resin (A).

The content of the structural unit derived from the monomer having a polar functional group relative to 100 parts by mass of the total structural unit of the (meth)acrylic resin (A) is preferably 20 parts by mass or less, more preferably 0.5 parts by mass or more 15 parts by mass or less, more preferably 0.5 parts by mass or more and 10 parts by mass or less, particularly preferably 1 parts 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 relative to 100 parts by mass of the total structural unit of the (meth)acrylic resin (A) is preferably 20 parts by mass or less, more preferably 4 parts by mass or more 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 (meth)acrylates include structural units derived from styrene-based monomers, structural units derived from vinyl-based monomers, and structural units derived from having a plural number in the molecule. A structural unit of a (meth)acrylic acid monomer, a structural unit derived from a (meth)acrylic amide monomer, etc.

Styrenic monomers include: styrene; methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, triethyl styrene, propyl styrene , Alkylstyrenes such as butylstyrene, hexylstyrene, heptylstyrene, and octylstyrene; halogenated styrenes such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene, and iodostyrene; Acetylstyrene; Acetylstyrene; Methoxystyrene; and Divinylbenzene.

Vinyl monomers include: vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, and other fatty acid vinyl esters; vinyl chloride, vinyl bromide, and other fatty acid vinyl esters ; Vinylidene halides such as vinylidene chloride; nitrogen-containing heteroaromatic vinyls such as vinyl pyridine, vinyl pyrrolidone, and vinyl carbazole; butadiene, isoprene, chloroprene and other conjugates Diene; and unsaturated nitrile such as acrylonitrile and methacrylonitrile.

Monomers having plural (meth)acrylic acid groups in the molecule include: 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1 , 9-nonanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, three Monomers with two (meth)acrylic groups in the molecule such as propylene glycol di(meth)acrylate; three (meth)acrylic groups in the molecule such as trimethylolpropane tri(meth)acrylate The monomer.

(Meth)acrylamide-based monomers include: N-methylol (meth)acrylamide, N-(2-hydroxyethyl)(meth)acrylamide, N-(3-hydroxyl Propyl)(meth)acrylamide, N-(4-hydroxybutyl)(meth)acrylamide, N-(5-hydroxypentyl)(meth)acrylamide, N-(6- Hydroxyhexyl)(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(methyl) Acrylamide, N-(3-dimethylaminopropyl)(meth)acrylamide, N-(1,1-dimethyl-3-oxobutyl)(meth)acrylamide Amine, N-[2-(2-Pendant oxy-1-imidazolidinyl) ethyl] (meth) allylamide, 2-propenylamino-2-methyl-1-propane sulfonic acid, N-(methoxymethyl)acrylamide, N-(ethoxymethyl)(meth)acrylamide, N-(propoxymethyl)(methyl) Acrylamide, N-(1-methylethoxymethyl)(meth)acrylamide, N-(1-methylpropoxymethyl)(meth)acrylamide, N-(2 -Methylpropoxymethyl)(meth)acrylamide, N-(butoxymethyl)(meth)acrylamide, N-(1,1-dimethylethoxymethyl) (Meth)acrylamide, N-(2-methoxyethyl)(meth)acrylamide, N-(2-ethoxyethyl)(meth)acrylamide, N-(2 -Propoxyethyl)(meth)acrylamide, N-[2-(1-methylethoxy)ethyl](meth)acrylamide, N-[2-(1-methyl Propoxy)ethyl](meth)acrylamide, N-[2-(2-methylpropoxy)ethyl](meth)acrylamide, N-(2-butoxyethyl) ) (Meth)acrylamide, N-[2-(1,1-dimethylethoxy)ethyl](meth)acrylamide, etc. Among them, N-(methoxymethyl)acrylamide, N-(ethoxymethyl)acrylamide, N-(propoxymethyl)acrylamide, N-(butoxymethyl) Yl)acrylamide, and N-(2-methylpropoxymethyl)acrylamide.

The weight average molecular weight (Mw) of the (meth)acrylic resin (A) is preferably 500,000 to 2.5 million. If the weight average molecular weight is more than 500,000, the durability of the adhesive layer in a high temperature environment will be improved, and it will be easy to inhibit the floating and peeling between the adherend and the adhesive layer, or the cohesive failure of the adhesive layer. If the weight average molecular weight is 2.5 million or less, it is advantageous from the viewpoint of coatability. From the viewpoint of having both the durability of the adhesive layer and the coatability of the adhesive composition, the weight average molecular weight is preferably 600,000 to 1.8 million, more preferably 700,000 to 1.7 million, and particularly preferably 1 million to 160 ten thousand. In addition, 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 2-10, preferably 3-8, more preferably 3-6. The weight average molecular weight can be analyzed by gel permeation chromatography, and is a standard polystyrene conversion value.

When the (meth)acrylic resin (A) is dissolved in ethyl acetate to form a solution with a concentration of 20% by mass, the viscosity at 25°C is preferably 20Pa‧s or less, more preferably 0.1-15Pa‧ s. If the viscosity is in this range, it is advantageous from the viewpoint of coating properties when the adhesive composition is applied to the substrate. In addition, 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, especially -40 to 0°C. ℃. If the Tg is below the upper limit, it is beneficial to improve the wettability of the adhesive layer to the adherend substrate, and if it is above the lower limit, it is beneficial to improve the durability of the adhesive layer. In addition, 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, and an emulsion polymerization method, and a solution polymerization method is particularly preferred. The solution polymerization method includes, for example, mixing monomers and organic solvents, adding a thermal polymerization initiator in a nitrogen environment, and stirring at a temperature of 40 to 90°C (preferably about 50 to 80°C) for about 3 to 15 hours的方法。 The method. In order to control the reaction, a monomer or a thermal polymerization initiator may be added continuously or intermittently during the polymerization. The monomer or thermal polymerization initiator may also be added to an organic solvent.

As the polymerization initiator, a thermal polymerization initiator, a photopolymerization initiator, or the like can be used. The photopolymerization initiator includes 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl)ketone and the like. The thermal polymerization initiator can include: 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane) -1-carbonitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxypentane) Nitrile), dimethyl-2,2'-azobis(2-methylpropionate), 2,2'-azobis(2-hydroxymethylpropionitrile) and other azo compounds; peroxide Lauryl, tertiary butyl hydroperoxide, benzoyl peroxide, tertiary butyl peroxybenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, dipropyl peroxydicarbonate, Tert-butyl peroxyneodecanoate, tert-butyl peroxypivalate, (3,5,5-trimethylhexyl) (Acidyl) peroxides and other organic peroxides; potassium persulfate, ammonium persulfate, hydrogen peroxide and other inorganic peroxides. In addition, a redox-based initiator in which a peroxide and a reducing agent are used in combination can be used.

The ratio of the polymerization initiator is about 0.001 to 5 parts by mass relative to 100 parts by mass of the total amount of monomers constituting the (meth)acrylic resin (A). The polymerization of (meth)acrylic resin can use a polymerization method performed by active energy rays (for example, ultraviolet rays, etc.).

Examples of organic solvents include aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; aliphatic alcohols such as propanol and isopropanol; acetone, methyl ethyl ketone, and methyl isopropyl alcohol. Ketones such as butyl ketone, etc.

In 100% by mass of the adhesive composition, the content of the (meth)acrylic resin (A) is usually 60% to 99.9% by mass, preferably 70% to 99.5% by mass, and more preferably 80% to 99.9% by mass. 99% by mass.

The crosslinking agent (B) reacts with the polar functional group (for example, a hydroxyl group, an amino group, a carboxyl group, a heterocyclic group, etc.) in the (meth)acrylic resin (A). The cross-linking agent (B) forms a cross-linked structure with (meth)acrylic resin or the like to form a cross-linked structure favorable for durability or heavy workability.

The cross-linking agent (B) includes isocyanate-based cross-linking agents, epoxy-based cross-linking agents, aziridine-based cross-linking agents, metal chelate-based cross-linking agents, etc., especially from the adhesive composition From the viewpoints of pot life, durability of the adhesive layer, and crosslinking speed, an isocyanate-based crosslinking agent is preferred.

The isocyanate compound is preferably a compound having at least two isocyanate groups (-NCO) in the molecule, and examples thereof include aliphatic isocyanate compounds (e.g., hexamethylene diisocyanate, etc.), alicyclic isocyanate compounds (e.g., Isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate), aromatic isocyanate compounds (examples Such as toluene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, etc.). In addition, the crosslinking agent (B) may be an adduct formed by a polyol compound of the aforementioned isocyanate compound (for example, an adduct formed by using glycerin, trimethylolpropane, etc.), isocyanurate Ester compounds, biuret compounds, amines formed by addition reaction with polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, etc. Derivatives such as ethyl formate prepolymer isocyanate compounds. The crosslinking agent (B) can be used alone or in combination of two or more kinds. Among these, representative ones include aromatic isocyanate compounds (for example, toluene diisocyanate, xylylene diisocyanate), aliphatic isocyanate compounds (for example, hexamethylene diisocyanate), or the use of these Polyol compounds (for example, glycerol, trimethylolpropane) formed adducts, or isocyanurate body. If the crosslinking agent (B) is an aromatic isocyanate compound and/or such an adduct formed from a polyol compound or an isocyanurate body, it is advantageous to form the most suitable crosslink density ( Or cross-linked structure), which can improve the durability of the adhesive layer. Particularly, if it is a toluene diisocyanate compound and/or an adduct formed from a polyol compound, for example, durability can be improved even when an adhesive layer is applied to a polarizing plate.

The content of the crosslinking agent (B) is usually 0.01 to 15 parts by mass, preferably 0.05 to 10 parts by mass, and more preferably 0.1 to 5 parts by mass relative to 100 parts by mass of the (meth)acrylic resin (A).

The adhesive composition forming the light-selectively absorbing adhesive layer of the present invention may further contain a silane compound (D).

The silane compound (D) includes, for example, vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tris(2-methoxyethoxy) silane, 3-glycidyloxypropyl trimethoxy Silane, 3- Glycidyloxypropyltriethoxysilane, 3-glycidyloxypropylmethyldimethoxysilane, 3-glycidyloxypropylethoxydimethylsilane, 2-( 3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethyl Oxysilane, 3-mercaptopropyl trimethoxysilane, etc.

The silane compound (D) may be a polysiloxane oligomer. If the specific example of the polysiloxane oligomer is expressed in the form of a combination of monomers, it is as follows.

3-mercaptopropyltrimethoxysilane/tetramethoxysilane oligomer, 3-mercaptopropyltrimethoxysilane/tetraethoxysilane oligomer, 3-mercaptopropyltriethoxysilane/tetra Methoxysilane oligomer, 3-mercaptopropyl triethoxysilane/tetraethoxysilane oligomer, etc. containing mercaptopropyl oligomers; mercaptomethyltrimethoxysilane/tetramethoxysilane Oligomer, mercaptomethyltrimethoxysilane/tetraethoxysilane oligomer, mercaptomethyltriethoxysilane/tetramethoxysilane oligomer, mercaptomethyltriethoxysilane/tetraethyl Oxysilane oligomers and other oligomers containing mercaptomethyl groups; 3-glycidyloxypropyltrimethoxysilane/tetramethoxysilane copolymer, 3-glycidyloxypropyltrimethoxy Silane/tetraethoxysilane copolymer, 3-glycidyloxypropyltriethoxysilane/tetramethoxysilane copolymer, 3-glycidyloxypropyltriethoxysilane/tetraethyl Oxysilane copolymer, 3-glycidyloxypropylmethyldimethoxysilane/tetramethoxysilane copolymer, 3-glycidyloxypropylmethyldimethoxysilane/tetraethyl Oxysilane copolymer, 3-glycidyloxypropylmethyldiethoxysilane/tetramethoxysilane copolymer, 3-glycidyloxypropylmethyldiethoxysilane/tetraethyl Copolymers containing 3-glycidyloxypropyl, such as oxysilane copolymers; 3-methacryloxypropyl trimethoxysilane/tetramethoxysilane oligomer, 3-methacryloxypropyl Oxypropyl trimethoxysilane/tetraethoxysilane oligomer, 3-methacryloxypropyl triethoxysilane/tetramethoxysilane oligomer, 3-methacrylic acid Oxypropyltriethoxysilane/tetraethoxysilane oligomer, 3-methacryloxypropylmethyldimethoxysilane/tetramethoxysilane oligomer, 3-methyl Acrylicoxypropylmethyldimethoxysilane/tetraethoxysilane oligomer, 3-methacryloxypropylmethyldiethoxysilane/tetramethoxysilane oligomer, 3-methacryloxypropylmethyldiethoxysilane/tetraethoxysilane oligomers and other oligomers containing methacryloxypropyl; 3-methacryloxypropyl trimethyl Oxysilane/tetramethoxysilane oligomer, 3-propenoxypropyltrimethoxysilane/tetraethoxysilane oligomer, 3-propenoxypropyltriethoxysilane/tetra Methoxysilane oligomer, 3-propenyloxypropyltriethoxysilane/tetraethoxysilane oligomer, 3-propenyloxypropylmethyldimethoxysilane/tetramethoxysilane -Based silane oligomer, 3-propenyloxypropylmethyldimethoxysilane/tetraethoxysilane oligomer, 3-propenyloxypropylmethyldiethoxysilane/tetramethoxysilane Oligomers containing propylene oxypropyl groups, such as 3-propylene oxypropyl methyl diethoxy silane/tetraethoxy silane oligomers; vinyl trimethoxy silane/ Tetramethoxysilane oligomer, vinyltrimethoxysilane/tetraethoxysilane oligomer, vinyltriethoxysilane/tetramethoxysilane oligomer, vinyltriethoxysilane oligomer/ Tetraethoxysilane oligomer, vinylmethyldimethoxysilane/tetramethoxysilane oligomer, vinylmethyldimethoxysilane/tetraethoxysilane oligomer, vinyl methyl Diethoxysilane/tetramethoxysilane oligomer, vinylmethyldiethoxysilane/tetraethoxysilane oligomer and other vinyl-containing oligomers; 3-aminopropyltrimethyl Oxysilane/tetramethoxysilane copolymer, 3-aminopropyltrimethoxysilane/tetraethoxysilane copolymer, 3-aminopropyltriethoxysilane/tetramethoxysilane copolymer , 3-Aminopropyltriethoxysilane/tetraethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane/tetramethoxysilane copolymer, 3-aminopropylmethyl Dimethoxysilane/tetraethoxysilane copolymer, 3-aminopropylmethyl Amine group-containing copolymers such as diethoxysilane/tetramethoxysilane copolymer, 3-aminopropylmethyl diethoxysilane/tetraethoxysilane copolymer, etc.

The silane compound (D) may be a silane compound represented by the following formula (d1). If the adhesive composition contains the silane compound represented by the following formula (d1), the adhesion to the substrate, glass, transparent electrode, etc. can be further improved, so it can be formed that it is not easy to cause floating, peeling or foaming in a high-temperature environment Adhesive layer with good durability.

(In the formula, B represents alkyl having 1 to 20 carbon atoms or a bis group of 3-20 carbon atoms, a divalent alicyclic hydrocarbon group constituting the alkoxy group, and the two alicyclic hydrocarbon group of -CH ₂ - may be -O- Or -CO- substituted, R ^d7 represents an alkyl group with 1 to 5 carbons, ^Rd8 , ^Rd9 , ^Rd10 , ^Rd11 and ^Rd12 each independently represent an alkyl group with 1 to 5 carbons or an alkyl group with 1 to 5 carbons Alkoxy).

In the formula (d1), B represents an alkanediyl group with 1 to 20 carbon atoms such as methylene, ethylene, trimethylene, tetramethylene, hexamethylene, heptamethylene, and octamethylene; Cyclobutylene (e.g. 1,2-cyclopentyl), cyclopentyl (e.g. 1,2-cyclopentyl), cyclohexyl (e.g., 1,2-cyclohexyl), cyclooctyl (E.g. 1,2-cyclooctyl) and other divalent alicyclic hydrocarbon groups with 3 to 20 carbons, or -CH ₂ -via -O- or -CO constituting these alkanediyl groups and the aforementioned alicyclic hydrocarbon groups -Substituted group. Preferably, B is an alkanediyl group having 1 to 10 carbons. R ^d7 represents an alkyl group with 1 to 5 carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, second butyl, tertiary butyl, pentyl, etc., R ^d8 , R ^d9 , R ^d10 , R ^d11 and R ^d12 each independently represent the alkyl group having 1 to 5 carbon atoms, or methoxy, ethoxy, propoxy, isopropoxy, butoxy, and second butoxy as exemplified in ^{R 21} , C1-C5 alkoxy such as tertiary butoxy. Preferably ^Rd8 , ^Rd9 , ^Rd10 , ^Rd11 and ^Rd12 are each independently an alkoxy group having 1 to 5 carbon atoms. These silane compounds (D) can be used alone or in combination of two or more kinds.

Specific examples of the silane compound represented by the aforementioned formula (d1) include: (trimethoxysilyl)methane, 1,2-bis(trimethoxysilyl)ethane, 1,2-bis(triethoxy) Silyl)ethane, 1,3-bis(trimethoxysilyl)propane, 1,3-bis(triethoxysilyl)propane, 1,4-bis(trimethoxysilyl)butane, 1,4-bis(triethoxysilyl)butane, 1,5-bis(trimethoxysilyl)pentane, 1,5-bis(triethoxysilyl)pentane, 1,6 -Bis(trimethoxysilyl)hexane, 1,6-bis(triethoxysilyl)hexane, 1,6-bis(tripropoxysilyl)hexane, 1,8-bis( Trimethoxysilyl)octane, 1,8-bis(triethoxysilyl)octane, 1,8-bis(tripropoxysilyl)octane and other bis(triC1-5 alkoxy) Silyl)C1-10 alkane; bis(dimethoxymethylsilyl)methane, 1,2-bis(dimethoxymethylsilyl)ethane, 1,2-bis(dimethoxyethyl) Silyl)ethane, 1,4-bis(dimethoxymethylsilyl)butane, 1,4-bis(dimethoxyethylsilyl)butane, 1,6-bis(dimethoxyethylsilyl)butane, Methoxymethylsilyl)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) Alkyl) hexane, 1,8-bis(methoxydimethylsilyl)octane and other bis(mono-C1-5 alkoxy-diC1-5 alkylsilyl)C1-10 alkane, etc. Among these, 1,2-bis(trimethoxysilyl)ethane, 1,3-bis(trimethoxysilyl)propane, 1,4-bis(trimethoxysilyl)butane, 1,5-bis(trimethoxysilyl)pentane, 1,6-bis(trimethoxysilyl)hexane, 1,8-bis(trimethoxysilyl)octane and other bis(triC1- 3 Alkoxysilyl) C1-10 alkane, particularly preferably 1,6-bis(trimethoxysilyl)hexane and 1,8-bis(trimethoxysilyl)octane.

Relative to 100 parts by mass of the (meth)acrylic resin (A), the content of the silane compound (D) is usually 0.01 to 10 parts by mass, preferably 0.03 to 5 parts by mass, more preferably 0.05 to 2 parts by mass, and More preferably, it is 0.1 to 1 part by mass. If it is less than the above upper limit, it is advantageous to suppress the exudation of the silane compound (A) from the adhesive layer, and if it is more than the above lower limit, it is easy to improve the adhesion between the adhesive layer and the metal layer or glass substrate (or Adhesion), which is beneficial to improve peel resistance and the like.

The adhesive composition may further contain an antistatic agent.

Examples of the antistatic agent include surfactants, silicone compounds, conductive polymers, ionic compounds, and the like, and ionic compounds are preferred. The ionic compound can be exemplified by conventional ones. Examples of the cationic component constituting the ionic compound include organic cations and inorganic cations. Examples of organic cations include pyridinium cations, pyrrolidinium cations, piperidinium cations, imidazolium cations, ammonium cations, sulfonium cations, and phosphonium cations. 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, from the viewpoint of compatibility with (meth)acrylic resins, pyridinium cations, imidazolium cations, pyrrolidinium cations, lithium cations, and potassium cations are preferred. The anion component constituting the ionic compound may be either an inorganic anion or an organic anion, but from the viewpoint of antistatic performance, it is preferably an anion component containing a fluorine atom. The anion component containing a fluorine atom includes, for example, hexafluorophosphate anion (PF ₆ -), bis(trifluoromethanesulfonyl)imide anion [(CF ₃ SO ₂ ) ₂ N-], bis(fluorosulfonyl) ) Imine anion [(FSO ₂ ) ₂ N-], tetrakis(pentafluorophenyl) borate anion [(C ₆ F ₅ ) ₄ B-], etc. The ionic compound can be used alone or in combination of two or more kinds. Particularly preferred are bis(trifluoromethanesulfonyl)imine anion [(CF ₃ SO ₂ ) ₂ N-], bis(fluorosulfonyl)imine anion [(FSO ₂ ) ₂ N-], tetrakis (five Fluorophenyl)borate anion [(C ₆ F ₅ ) ₄ B-].

From the viewpoint of the temporal stability of the antistatic performance of the adhesive layer formed of the adhesive composition, it is preferably an ionic compound that is solid at room temperature.

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

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

[middle layer]

The optical laminate of the present invention has an intermediate layer 300. The optical laminate of the present invention has an intermediate layer 300 between the polarizer 10 and the light selective absorption adhesive layer 20, thereby suppressing the transfer of the light selective absorption agent contained in the light selective absorption adhesive layer 20 to The effect of the polarizer 10. However, the intermediate layer 300 has only one layer or a plurality of layers selected from the group consisting of the liquid crystal hardening layer, the alignment layer, and the bonding layer, instead of completely blocking the penetration of the light selective absorber, so the suppression effect Not enough. In the optical laminate of the present invention, by adjusting the absorbance of the light-selectively absorbing adhesive layer, discoloration at the end of the polarizer under high temperature and high humidity can be suppressed.

The thickness of the intermediate layer 300 is not limited, but is, for example, 1 μm or more and 200 μm or less. From the viewpoint of suppressing the transfer of the light selective absorber contained in the light selective absorption adhesive layer, it is preferably 5 μm or more and 200 μm or less.

From the viewpoint of suppressing the discoloration of the polarizer 10, the intermediate layer 300 preferably does not contain a light selective absorber. When it contains a light selective absorber, the content per unit area of the light selective absorber is preferably 0.5 g/m ² or less.

[Liquid crystal hardened layer]

The optical laminate of the present invention may have a liquid crystal hardened layer as an intermediate layer. The liquid crystal hardening layer may be one layer or two or more layers. The optical laminate 101 shown in FIG. 2 has a first liquid crystal hardened layer 30 and a second liquid crystal hardened layer 31.

The liquid crystal cured layer is a layer of a cured product of a polymerizable liquid crystal compound, such as a retardation layer.

The retardation layer belonging to the cured product of the polymerizable liquid crystal compound can be exemplified by the first to fifth aspects.

The first aspect: a phase difference layer in which a rod-shaped liquid crystal compound is aligned in a horizontal direction with respect to a supporting substrate.

The second aspect: a retardation layer in which a rod-shaped liquid crystal compound is aligned in a vertical direction with respect to the support substrate.

The third aspect: a phase difference layer in which the rod-shaped liquid crystal compound changes the alignment direction spirally in the plane.

The fourth aspect: a retardation layer in which a discotic liquid crystal compound is oriented obliquely.

Fifth aspect: a biaxial retardation layer in which the discotic liquid crystal compound is aligned in the vertical direction with respect to the support substrate.

For example, the first form, the second form, and the fifth form are suitable for the optical laminate used in the organic electroluminescence display. Alternatively, retardation layers of these types can be laminated and used.

The retardation layer preferably has reverse wavelength dispersion. Reverse wavelength dispersion refers to the optical characteristics of the phase difference in the alignment plane of the short-wavelength liquid crystal being smaller than the retardation value in the alignment plane of the long-wavelength liquid crystal. Preferably, the retardation layer satisfies the following equations (7) and (8) . In addition, Re(λ) represents the value of the in-plane phase difference with respect to the light of the wavelength λnm.

Re(450)/Re(550)≦1 (7)

1≦Re(630)/Re(550) (8)

In the optical laminate of the present invention, when the retardation layer is in the first form and has reverse wavelength dispersion, since the coloration during black display of the display device is reduced, it is preferred, and 0.82 is more preferred in the aforementioned formula (7) ≦Re(450)/Re(550)≦0.93. More preferably, 120≦Re(550)≦150.

The polymerizable liquid crystal compound used when forming the retardation layer can be exemplified: "3.8.6 Network Fully Crosslinked Type" by the Liquid Crystal Handbook (Edited by the Liquid Crystal Handbook Editorial Committee, Maruzen Co., Ltd., issued on October 30, 2012) ", "6.5.1 Liquid crystal material b. Polymeric nematic liquid crystal material" the compound having a polymerizable group; and Japanese Patent Application Publication No. 2010-31223, Japanese Patent Application Publication No. 2010-270108, and Japanese Patent Application Publication No. 2010-31223 Japanese Patent Application Publication No. 2011-6360, Japanese Patent Application Publication No. 2011-207765, Japanese Patent Application Publication No. 2011-162678, Japanese Patent Application Publication No. 2016-81035, International Publication No. 2017/043438, and Japanese Patent Application Publication No. 2011-207765 The polymerizable liquid crystal compound described in the gazette, etc.

The method of manufacturing the retardation layer from the polymer of the polymerizable liquid crystal compound in the aligned state includes, for example, the method described in Japanese Patent Application Laid-Open No. 2010-31223.

The thickness of the retardation layer belonging to the liquid crystal cured layer formed by curing the 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.

The retardation layer can be a λ/4 retardation layer that imparts a retardation of 1/4 wavelength to the transmitted light, a λ/2 retardation layer that imparts a retardation of 1/2 wavelength to the transmitted light, and a positive A board, and positive C board. Like the optical laminate 101 shown in FIG. 2, when the first liquid crystal hardened layer 30 and the second liquid crystal hardened layer 31 are included, the combination of the first liquid crystal hardened layer 30 and the second liquid crystal hardened layer 31 Examples include a combination of a λ/2 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 can be configured as a circular polarizing plate having a λ/4 retardation layer. The circular polarizer can be used as an anti-reflection polarizer.

[Alignment layer]

The alignment layer has an alignment restricting force that allows the liquid crystal compound contained in the liquid crystal hardening layer to be formed on the alignment layer to align the liquid crystal in a desired direction. The alignment layer can include an alignment polymer layer formed by an alignment polymer, a photoalignment polymer layer formed by a photo-alignment polymer, and groove alignment with a concave-convex pattern or a plurality of grooves on the surface of the layer. Floor. The thickness of the alignment layer is usually 0.01 to 10 μm, preferably 0.01 to 5 μm.

The composition obtained by dissolving the aligning polymer in a solvent can be applied to the substrate layer, the solvent can be removed, and the rubbing treatment can be performed if necessary to form the aligning polymer layer. At this time, in the alignment polymer layer formed of the alignment polymer, the alignment restriction force can be arbitrarily adjusted according to the surface state of the alignment polymer or the friction conditions.

A composition containing a polymer or monomer having a photoreactive group and a solvent is coated on the substrate layer and irradiated with polarized light, thereby forming a photo-aligned polymer layer. At this time, in the photo-alignment polymer layer, the alignment restriction force can be arbitrarily adjusted according to the polarized light irradiation conditions for the photo-alignment polymer.

The groove alignment layer can be formed, for example, by a method of forming a concave-convex pattern on the surface of the photosensitive polyimide film through an exposure mask having a pattern-shaped slit through exposure, development, etc. ; A method of forming an uncured layer of active energy ray-curable resin on a plate-shaped mother sheet with grooves on the surface, transferring the layer to the substrate layer and curing; forming on the substrate layer A method of forming an uncured layer of active energy ray-curable resin by pressing a roll-shaped mother sheet with unevenness on the layer, thereby forming unevenness and curing.

The base material layer is preferably a film formed of a resin material. As the resin material, for example, a resin material excellent in transparency, mechanical strength, thermal stability, extensibility, etc. can be used. Specific examples include: polyolefin-based resins such as polyethylene and polypropylene; cyclic polyolefin-based resins such as norbornene-based polymers; polyethylene terephthalate, polyethylene naphthalate, and other polyolefin resins Ester resins; (meth)acrylic resins such as (meth)acrylic acid and polymethyl (meth)acrylate; cellulose ester resins such as cellulose triacetate, cellulose diacetate, and cellulose acetate propionate; poly Vinyl alcohol resins such as vinyl alcohol and polyvinyl acetate; polycarbonate resins; polystyrene resins; polyarylate resins; polyvinyl resins; polyether ether resins; polyamide resins; polyamides Imine resins; polyetherketone resins; polyphenylene sulfide resins; polyphenylene ether resins, and mixtures and copolymers thereof. Among these resins, it is preferable to use any one of a cyclic polyolefin resin, a polyester resin, a cellulose ester resin, and a (meth)acrylic resin, or a mixture thereof. In addition, 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 of one kind or a mixture of two or more kinds of the above-mentioned resins, or may have a multilayer structure of two or more layers. In the case of a multilayer structure, the resins constituting each layer may be the same or different.

Any additives can be added to the resin material forming the resin film. Examples of additives include light selective absorbers, antioxidants, slip agents, plasticizers, release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, and coloring agents.

The thickness of the substrate layer is not particularly limited. Generally speaking, from the viewpoint of workability such as strength and handling, it is preferably 5 to 200 μm, more preferably 10 to 200 μm, and still more preferably 10 to 150 μm.

In order to improve the adhesion between the base layer and the alignment layer, corona treatment, plasma treatment, flame treatment, etc. may be performed on at least the surface of the base layer on the side where the alignment layer is to be formed, or a primer layer may be formed. The base layer can be peeled off from the layer structure consisting of the base layer/alignment layer/liquid crystal hardened layer, and the alignment layer/liquid crystal hardened layer is used as the constituent element of the intermediate layer of the present invention, and the base layer/alignment can also be peeled off. The liquid crystal hardened layer is used as a constituent element of the intermediate layer of the present invention.

[Laminated layer]

The intermediate layer 300 may include a bonding layer for joining two layers. Examples of the bonding layer include an adhesive layer, an adhesive layer (hereinafter, also referred to as a "second adhesive layer"), and the like. The optical laminate 101 shown in FIG. 2 has an adhesive layer 33 interposed between the first liquid crystal hardened layer 30 and the second liquid crystal hardened layer 31 and bonded to these layers, and a sum of adhesive layers laminated on the first liquid crystal hardened layer 30 The second adhesive layer 32 on the surface opposite to the agent layer 33.

For the adhesive layer, a water-based adhesive, an active energy ray-curable adhesive, or a thermosetting adhesive can be 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 adhesive layer may be composed of the same adhesive composition as the adhesive composition forming the light selective absorption adhesive layer, or may be composed of (meth)acrylic, rubber, urethane, or ester It is composed of an adhesive composition (hereinafter, also referred to as "second adhesive composition") with resins such as silicone, silicone, and polyvinyl ether as the main component. The second adhesive composition is suitably an adhesive composition using (meth)acrylic resin excellent in transparency, weather resistance, heat resistance, etc., as a base polymer. The second adhesive composition may be an active energy ray hardening type or a thermal hardening type. The thickness of the second adhesive layer is, for example, 0.1 to 150 μm, usually 8 to 60 μm, and from the viewpoint of thinning, it is 30 μm or less, preferably 20 μm or less.

In the second adhesive layer, from the viewpoint of suppressing the discoloration of the polarizer 10, it is preferable that no light selective absorber is contained. When the light selective absorber is contained, the total resin composition per unit area of the light selective absorber is 100 parts by mass, preferably 0.5 parts by mass or less.

<Manufacturing method of optical laminate>

The optical layered bodies 100, 101, and 102 can be manufactured by a method including a step of bonding constituent layers to each other via a bonding layer. In addition, it may include a step of peeling off layers that do not constitute layers. When the layers are bonded to each other via the bonding layer, in order to improve adhesion, it is preferable to perform surface activation treatment such as corona treatment on one or both sides of the bonding surface.

<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, a square, etc., or may have a shape with a cut-out portion on one of the sides constituting the rectangle, or a so-called irregular shape such as a semicircular shape, a shape with a through hole in the surface, etc. . When the outer shape of the optical layered body has straight sides, the absorption axis of the polarizer constituting the optical layered body may be parallel or orthogonal to the side, or may be inclined, for example, crossing at an angle of 45°. When the optical laminate has a retardation layer and the retardation layer has a slow axis in the plane, the slow axis and the absorption axis of the polarizer constituting the optical laminate may intersect 45°, 15°, or 75° .

<Image display device>

The optical laminates 100, 101, and 102 are arranged on the front surface (visual recognition side) of the image display panel and can be used as constituent elements of the image display device. The optical laminate belonging to the circular polarizing plate can also be used as an anti-reflection polarizing plate that imparts an anti-reflection function in an image display device. The image display device is not particularly limited, and examples include organic electroluminescence (organic EL) display devices, inorganic electric Image display devices such as electroluminescence (inorganic EL) display devices, liquid crystal display devices, and electroluminescence display devices.

[Example]

Although the present invention will be explained in more detail below with examples, the present invention is not limited to these. The "%" and "parts" in the examples and comparative examples are "mass %" and "parts by mass" unless otherwise specified.

[Production of single-sided protective polarizing plate]

(Production of polarizer)

A polyvinyl alcohol film with a thickness of 20μm, a degree of polymerization of 2400, and a degree of saponification of 99% or more is uniaxially stretched on a hot roller to a stretching ratio of 4.1 times. It contains 0.05 parts by weight of iodine and potassium iodide per 100 parts by weight of water while maintaining a tight state. 5 parts by weight of the dyeing bath was immersed at 28°C for 60 seconds.

Next, it was immersed in a boric acid aqueous 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. Next, it was immersed in a 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. After that, 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.

(Preparation of water-based adhesive)

Dissolve 3 parts by mass of carboxyl modified polyvinyl alcohol (Kuraray Co., Ltd., trade name "KL-318") with respect to 100 parts by weight of water, and add a polyamide epoxy additive (a water-soluble epoxy resin) to this aqueous solution. Taoka Chemical Industry Co., Ltd., brand name "Sumirez Resin (registered trademark) 650 (30), an aqueous solution with a solid content of 30% by weight) 1.5 parts by mass, and prepared a water-based adhesive.

(Protective film A and peeling film B)

For the protective film A, a film (manufactured by Nippon Paper Co., Ltd., trade name "COP25ST-HC") having a hard coat layer of 3 μm formed on a stretched film composed of norbornene-based resin having a thickness of 25 μm was used.

As the release film B, a cellulose triacetate film (manufactured by FUJIFILM Co., Ltd., "TD80UL") was used. The thickness of the peeling film is 80μm, and the moisture permeability is 502g/m ² ‧24hr.

(Production of single-sided protective polarizing plate)

While continuously conveying the produced polarizer, the protective film A is continuously pulled out from the roll of the protective film A, and the release film B is continuously pulled out from the roll of the release film B. While injecting the water-based adhesive between the polarizer and the corona-treated protective film A, and at the same time injecting pure water between the polarizer and the release film B, and passing through the laminating roller, the protective film A/water-based adhesive is obtained /Polarizer/Pure water/Laminated film composed of release film B. The laminated film is transported and heated in a drying oven at 80°C for 300 seconds to dry the water-based adhesive while volatilizing and removing the pure water existing between the polarizer and the release film B to obtain a single side with a release film Protect the polarizer. The release film B was peeled off from the single-sided protective polarizing plate with a release film, and the single-sided protective polarizing plate was obtained.

[Production of retardation laminate]

(Preparation for "Alignment Layer/First Liquid Crystal Hardening Layer")

Prepare the alignment layer formed on the base film and the λ/4 retardation layer (the first liquid crystal hardening layer) which is a layer formed by hardening the nematic liquid crystal compound. In addition, the total thickness of the "alignment layer/first liquid crystal hardening layer" is 2 μm.

(Production of "Alignment Layer/Second Liquid Crystal Hardening Layer")

10.0 parts by mass of polyethylene glycol di(meth)acrylate (manufactured by Shinnakamura Chemical Industry Co., Ltd., A-600), and trimethylolpropane triacrylate (manufactured by Shinnakamura Chemical Industry Co., Ltd., A-600) TMPT) 10.0 parts by mass, 1,6-hexanediol di(meth)acrylate (manufactured by Shinnakamura Chemical Industry Co., Ltd., A-HD-N) 10.0 parts by mass, IRGACURE 907 ( As a composition for forming an alignment layer, 1.50 parts by mass of Irg-907) was dissolved in a solvent of 70.0 parts by mass of methyl ethyl ketone in a solvent to prepare a coating solution for forming an alignment layer.

An elongated cyclic olefin resin (COP) film (manufactured by ZEON Co., Ltd., Japan) with a thickness of 20 μm was prepared as a base film, and the coating liquid for forming an alignment layer was coated on one side of the base film with a bar coater.

After the coated layer is heat-treated at a temperature of 80°C for 60 seconds, irradiated with ultraviolet (UVB) 220mJ/cm ² to polymerize and harden the composition for forming the alignment layer, and form an alignment with a thickness of 2.3μm on the base film Floor.

20.0 parts by mass of a photopolymerizable nematic liquid crystal compound (manufactured by Merck, RMM28B) and 1.0 part by mass of IRGACURE 907 (manufactured by BASF, Irg-907) as a photopolymerization initiator are dissolved in a solvent of propylene glycol mono As a composition for forming a retardation layer in 80.0 parts by mass of methyl ether acetate, a coating liquid for forming a retardation layer was prepared.

The coating liquid for forming a retardation layer was coated on the previously obtained alignment layer, and the coating layer was subjected to a heat treatment at a temperature of 80° C. for 60 seconds. Thereafter, ultraviolet rays (UVB) of 220 mJ/cm ^{2 were} irradiated to polymerize and harden the composition for forming the retardation layer, and a retardation layer (second liquid crystal hardened layer) with a thickness of 0.7 μm was formed on the alignment layer. In this way, an "alignment layer/second liquid crystal hardened layer" with a total thickness of 3 μm was obtained on the base film.

(Production of phase difference laminate)

The "alignment layer/first liquid crystal hardening layer" laminated on the base film and the "alignment layer/second liquid crystal hardening layer" laminated on the base film are individually cured by ultraviolet curing adhesive (thickness 1μm). The liquid crystal hardening layer (the surface opposite to the base film) becomes the bonding surface. Next, ultraviolet rays are irradiated to harden the ultraviolet-curable adhesive to produce a phase difference laminate having two liquid crystal hardened layers of a first liquid crystal hardened layer and a second liquid crystal hardened layer.

[Making of light selective absorbing adhesive layer]

(Preparation of acrylic resin (A-1))

Add a mixed solution of 86.4 parts of ethyl acetate, 61.9 parts of butyl acrylate, and 1.9 parts of 2-hydroxyethyl acrylate as a solvent in a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer and a stirrer, while replacing the inside of the device with nitrogen The air is in an oxygen-free state while the internal temperature is increased to 60°C. Then, the total amount of the solution obtained by dissolving 0.4 part of azobisisobutyronitrile (polymerization initiator) in 10 parts of ethyl acetate was added. The resulting mixture was kept at 60°C for 1 hour, and then, while maintaining the internal temperature at 50 to 70°C, ethyl acetate was continuously added to the reaction vessel at an addition rate of 17.3 parts/hr, and the acrylic resin concentration became 35%. At this point, the addition of ethyl acetate was stopped, and the temperature was further kept at this temperature from the start of addition of ethyl acetate until 12 hours passed. Finally, ethyl acetate was added to adjust the acrylic resin concentration to 20% to prepare an ethyl acetate solution of acrylic resin. The weight average molecular weight Mw of the obtained acrylic resin in terms of polystyrene obtained by GPC was 600,000, and Mw/Mn was 7.0. Let this be an acrylic resin (A-1). The glass transition temperature obtained by DSC is -52.9°C.

(Making of Adhesive Layer (1))

In the ethyl acetate solution of acrylic resin (A-1) (resin concentration: 20%), with respect to 100 parts of the solid content of the solution, mix the crosslinking agent (CORONATE L, solid content 75%: TOSOH (manufactured by TOSOH) 0.5 part, silane compound (manufactured by Shin-Etsu Chemical Industry: KBM-403) 0.5 part, and as the light selective absorption compound (2) in Synthesis Example 2 described in paragraph [0142] of JP 2019-007001 A Furthermore, 2.5 parts of the compound (light selective absorber) represented by the following formula (aa2) is described, and 2-butanone is further added so that the solid content concentration becomes 14%, to obtain an adhesive composition (1). In addition, the blending amount of the above-mentioned cross-linking agent (CORONATE L) is the number of parts by mass in terms of the active ingredient.

Use an applicator to compose the above-prepared adhesive on the release-treated surface of a polyethylene terephthalate film (manufactured by LINTEC, SP-PLR382050, hereinafter referred to as "separator") that has undergone release treatment The substance (1) was applied so that the thickness of the adhesive layer after drying became 17 μm, and dried at 100° C. for 1 minute to produce an adhesive layer. The resulting adhesive layer is used as the adhesive layer (1). Table 1 shows the content of the light selective absorber per unit area of the adhesive layer (1).

(Making of Adhesive Layer (2))

The adhesive layer (2) was produced by the same method as the adhesive layer (1) except that the blending amount of the light selective absorber was set to 3.7 parts. Table 1 shows the content of the light selective absorber per unit area of the adhesive layer (2).

(Making of Adhesive Layer (3))

The adhesive layer (3) was produced by the same method as the adhesive layer (1) except that the blending amount of the light selective absorber was set to 5.4 parts. Table 1 shows the content of the light selective absorber per unit area of the adhesive layer (3).

[Production of the second adhesive layer]

In the ethyl acetate solution (resin concentration: 20%) of the acrylic resin (A-1), 0.5 part of a crosslinking agent (CORONATE L, 75% solid content: TOSOH) and a silane compound (manufactured by Shin-Etsu Chemical Industry: KBM-403) 0.5 part, and 2-butanone was further added so that the solid content concentration became 14%, to obtain an adhesive composition. In addition, the blending amount of the above-mentioned cross-linking agent (CORONATE L) is the number of parts by mass in terms of the active ingredient.

Use an applicator to coat the adhesive composition on the release treatment surface of the separator used in the production of the light selective absorption adhesive layer so that the thickness of the adhesive layer after drying becomes 5μm, and dry at 100°C for 1 minute , And make a second adhesive layer.

[Production of optical laminate]

(Example 1, 3)

A second adhesive layer is attached to the polarizer side of the manufactured single-sided protective polarizer, and the separator is peeled off. The surface of the second adhesive layer from which the separator was peeled off was bonded to the surface where the base film on the side of the first liquid crystal hardened layer of the produced retardation layered body was peeled off. After that, the base film on the side of the second liquid crystal hardened layer was peeled off, and the adhesive layer described in Table 1 was attached to the surface of the alignment layer on the side of the second liquid crystal hardened layer as a light selective absorbing adhesive layer to obtain a "protective film" A/water-based adhesive/polarizer/second adhesive layer/alignment layer/first liquid crystal hardening layer/second liquid crystal hardening layer/alignment layer/light selective absorption adhesive layer/separator body. In this optical laminate, the intermediate layer has a layer structure of "second adhesive layer/alignment layer/first liquid crystal hardened layer/second liquid crystal hardened layer/alignment layer", and has a total thickness of 11 μm.

In the above, the adhesive layer was coated with an applicator so that the thickness of the adhesive layer became 5 μm, and dried at 100° C. for 1 minute to produce the second adhesive layer. The total thickness of the "alignment layer/first liquid crystal hardening layer" is 2 μm. The total thickness of the "alignment layer/second liquid crystal hardening layer" is 3 μm.

The thickness of the UV-curing adhesive is 1μm.

(Examples 2, 4, and Comparative Example 1)

A second adhesive layer is attached to the polarizer side of the manufactured single-sided protective polarizer, and the separator is peeled off. The adhesive layer described in Table 1 was attached to the surface of the second adhesive layer from which the separator was peeled as a light selective absorption adhesive layer to obtain "Protective Film A/Water-based Adhesive/Polarizer/Second Adhesive Layer/light-selective absorbing adhesive layer/separator" layer constitutes an optical laminate. In this optical laminate, the intermediate layer is composed of a "second adhesive layer", and its thickness is 5 μm.

In the above, the adhesive layer was coated with an applicator so that the thickness of the adhesive layer became 5 μm, and dried at 100° C. for 1 minute to produce the second adhesive layer.

[Measurement of absorbance of adhesive layer]

The adhesive layer (1) to the adhesive layer (3) were attached to the glass respectively, and after the separator was peeled off, a cycloolefin polymer (COP) film (manufactured by ZEON Co., Ltd., ZF-14, Japan) was attached to the adhesive layer ) To produce a laminate for evaluation of the adhesive layer. The laminate for adhesive layer evaluation was set in a spectrophotometer UV-2450 (manufactured by Shimadzu Corporation), and the absorbance was measured in the wavelength range of 300 to 800 nm in the 1 nm step by the double beam method. Table 1 shows the absorbance of the produced adhesive layer at a wavelength of 410 nm. In addition, the absorbance of the glass at a wavelength of 410 nm and the absorbance of the COP film are both zero.

[Determination of weight average molecular weight (Mw)]

Regarding the weight average molecular weight (Mw) of the acrylic resin (A-1), it is the number average molecular weight (Mn) in terms of polystyrene. Tetrahydrofuran is used as the mobile phase, and the following particle size sieve analysis chromatography (SEC) is used And find out. The (meth)acrylic polymer to be measured is dissolved in tetrahydrofuran at a concentration of about 0.05% by mass, and 10 μL is injected in SEC.

The mobile phase flows at a flow rate of 1.0 mL/min. PLgel MIXED-B (manufactured by Polymer Laboratories) was used for the column. As the detector, a UV-VIS detector (trade name: Agilent GPC) was used.

[Determination 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 1 mol/L NaOH aqueous solution, and the amount of NaOH required for neutralization was compared with the calibration curve to calculate the boron content of the polarizer.

[Heat and heat resistance test and observation of discoloration]

After peeling off the separators of the optical laminates obtained in Examples 1 to 4 and Comparative Example 1, and pasting them on an alkali-free glass plate, they were placed in an environment with a temperature of 65° C. and a humidity of 90% RH for 500 hours.

After that, the non-alkali glass surface opposite to the optical laminate of the test is attached to a polarizing plate that will become a cross-polarizer relationship, and the observation image is observed with an optical microscope and saved. The optical microscope uses "VHX-500" manufactured by Keyence Co., Ltd. Fig. 4 shows an example of an observation image of an optical microscope. In FIG. 4, if viewed from the end 50 of the optical laminate in the inner direction along the straight line indicated by the arrow (the straight line extending from the end 50 in the vertical direction), it can be seen that there are discolored areas 51 and no discolored areas (not Fading area) 52.

[Measure the amount of fade by image processing]

Use the image analysis software "ImageJ (free software)" to convert the observation image of the microscope into black and white 256 levels (0 to 255). The method of converting to black and white 256 levels (0 to 255) uses the method of averaging the RGB values. Figure 5 shows an example of the converted data. With respect to the end 50 of the optical laminate, the intermediate point (the middle of the decoloration gradation) between the decolorization area 51 and the non-decoloration area 52 in the vertical direction (arrow in FIG. 4) of the gradient profile is used as the optical laminate. For the fading end (Figure 5), the distance (μm) from the end 50 of the optical laminate to the fading end was measured as the fading distance. The discoloration distance of the optical laminate is shown in Table 1. The smaller the fading distance, the narrower the fading range, which is excellent in heat and humidity resistance.

[Table 1]

10: Polarizer

11: Protective film

20: Light selective absorption adhesive layer

100: Optical laminate

300: middle layer

Claims (10)

An optical laminate having a polarizer, a light selective absorbing adhesive layer, and between the polarizer and the light selective absorbing adhesive layer and in contact with the polarizer and the light selective absorbing adhesive layer And the middle layer of the buildup, where, The aforementioned intermediate layer has only one layer or a plurality of layers selected from the group consisting of a liquid crystal hardening layer, an alignment layer, and a bonding layer, The aforementioned polarizer system has iodine adsorption and alignment, and the boron content is 5.0% by mass or less, The aforementioned light selective absorbing adhesive layer contains a light selective absorbing agent and has 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 having a protective film, and the protective film is laminated on the side of the polarizer opposite to the intermediate layer side. The optical laminate according to claim 1 or 2, wherein, in the light selective absorption adhesive layer, the content per unit area of the light selective absorption agent is 0.01 g/m ² or more and 5 g/m ² or less. The optical laminate according to any one of claims 1 to 3, wherein the light selective absorbing adhesive layer contains the light The absorbent is selected from 0.1 parts by mass to 10 parts by mass. The optical laminate according to any one of claims 1 to 4, wherein the thickness of the light selective absorption adhesive layer is 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 with 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 belonging to the liquid crystal hardened layer. The optical laminate according to any one of claims 1 to 7, which is an anti-reflection polarizing plate. An image display device includes 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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