KR20240046454A - Optical laminate and liquid crystal display device - Google Patents

Abstract

It includes an optical film, an adhesive layer, and a metal layer in this order, and the adhesive layer is composed of an adhesive composition containing a (meth)acrylic resin (A), a silane compound (B), and an ionic compound (C), The silane compound (B) is a silane compound represented by formula (I), and an optical laminate and a liquid crystal display device containing the same are provided.

Description

Optical laminate and liquid crystal display device {OPTICAL LAMINATE AND LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to an optical laminated body constituting an image display device such as a liquid crystal display device, and a liquid crystal display device including the same.

An optical film typified by a polarizing plate formed by laminating and bonding a transparent resin film to one or both sides of a polarizer is widely used as an optical member constituting an image display device such as a liquid crystal display device. An optical film such as a polarizing plate is often used by bonding it to another member (such as a liquid crystal cell in a liquid crystal display device) through an adhesive layer (see, for example, Japanese Patent Application Laid-Open No. 2010-229321). For this reason, as an optical film, an optical film with an adhesive layer in which an adhesive layer is previously formed on one side is known. Additionally, it is also known that an ionic compound is contained in the adhesive layer to provide antistatic properties.

Recently, liquid crystal display devices have been deployed for use in mobile devices with a touch panel function, such as smartphones, tablet-type terminals, and in-vehicle car navigation systems. In such a touch input type liquid crystal display device, the optical film with an adhesive layer may be disposed so that the adhesive layer contacts, for example, a metal layer composed of metal wiring, for example, through a resin layer or directly. However, in a configuration that combines a metal layer made of a metal material and an adhesive layer containing an ionic compound, the metal layer may corrode in a high temperature and high humidity environment. Among corrosion, corrosion is a particular problem because it penetrates the metal layer when the thickness of the metal layer is thin or when the metal layer is a metal wiring and the line width is narrow.

The purpose of the present invention is to provide an optical laminate in which an optical film with an adhesive layer is laminated on a metal layer such as a metal wiring layer, and is capable of suppressing corrosion of the metal layer, and a liquid crystal display device containing the same. .

The present invention provides an optical laminate shown below, a liquid crystal display device containing the same, and an adhesive composition.

[1] Containing an optical film, an adhesive layer, and a metal layer in this order,

The adhesive layer is composed of an adhesive composition containing a (meth)acrylic resin (A), a silane compound (B), and an ionic compound (C),

An optical laminate wherein the silane compound (B) is a silane compound represented by the following formula (I).

(Wherein, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH ₂ - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or - It may be substituted with C(=O)-, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a carbon number Indicates alkoxy groups of 1 to 5.)

[2] The metal layer is at least one selected from the group consisting of aluminum, copper, silver, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead, and alloys containing two or more metals selected from these. The optical laminate described in [1] containing.

[3] The optical laminate according to [1] or [2], wherein the metal layer contains an aluminum element.

[4] The optical laminate according to any one of [1] to [3], wherein the metal layer is a layer formed by sputtering.

[5] The optical laminate according to any one of [1] to [4], wherein the metal layer has a thickness of 3 μm or less.

[6] The optical laminate according to any one of [1] to [5], wherein the silane compound (B) represented by the formula (I) is a silane compound represented by the formula (II) below.

(In the formula, R ¹ , R ³ , R ⁴ , R ⁵ and R ⁶ each have the same meaning as above, R ⁷ represents an alkyl group having 1 to 5 carbon atoms, and m represents an integer of 1 to 20.)

[7] The optical laminate according to [6], wherein m in the formula (II) is an integer of 4 to 20.

[8] The optical laminate according to [6], wherein m in the formula (II) is an integer of 6 to 8.

[9] The optical laminate according to [6], wherein m in the formula (II) is 6.

[10] The optical laminate according to any one of [1] to [9], wherein the silane compound (B) is 1,6-bis(trimethoxysilyl)hexane.

[11] The content of the silane compound (B) in the adhesive composition is 0.01 to 10 parts by weight based on 100 parts by weight of the (meth)acrylic resin (A). Optical laminate.

[12] The optical laminate according to any one of [1] to [11], wherein the (meth)acrylic resin (A) contains a structural unit derived from a monomer having a hydroxyl group.

[13] The (meth)acrylic resin (A) includes a structural unit derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0°C and an alkyl acrylate (a2) having a homopolymer glass transition temperature of 0°C or more. ) The optical laminate according to any one of [1] to [12], which contains a structural unit derived from ).

[14] The optical laminate according to any one of [1] to [13], wherein the (meth)acrylic resin (A) has a weight average molecular weight of 500,000 to 2.5 million.

[15] The optical laminate according to any one of [1] to [14], wherein the adhesive composition further contains an isocyanate-based crosslinking agent (D).

[16] The optical laminate according to any one of [1] to [15], wherein the adhesive composition substantially does not contain a triazole-based compound.

[17] A liquid crystal display device comprising the optical laminate according to any one of [1] to [16].

[18] Contains (meth)acrylic resin (A), silane compound (B), and ionic compound (C),

The silane compound (B) is a silane compound represented by the following formula (I),

An adhesive composition used to form an adhesive layer laminated on a metal layer.

(Wherein, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH ₂ - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or - It may be substituted with C(=O)-, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a carbon number Indicates alkoxy groups of 1 to 5.)

According to the present invention, an optical laminate capable of suppressing corrosion of a metal layer and a liquid crystal display device including the same can be provided.

1 is a schematic cross-sectional view showing an example of an optical laminate according to the present invention.
Figure 2 is a schematic cross-sectional view showing an example of the layer structure of a polarizing plate.
Figure 3 is a schematic cross-sectional view showing another example of the layer structure of a polarizing plate.
Figure 4 is a schematic cross-sectional view showing an example of the layer structure of an optical laminate.
Figure 5 is a schematic cross-sectional view showing another example of the layer structure of an optical laminate.
Figure 6 is a schematic cross-sectional view showing another example of the layer structure of an optical laminate.
Figure 7 is a schematic cross-sectional view showing another example of the layer structure of an optical laminate.

<Optical laminate>

1 is a schematic cross-sectional view showing an example of an optical laminate according to the present invention. As shown in FIG. 1, the optical laminate according to the present invention includes an optical film 10, an adhesive layer 20, and a metal layer 30 in this order, and further includes a substrate 40. good night. This optical laminate is an optical film with an adhesive layer including an optical film 10 on a metal layer 30 formed on a substrate 40 and an adhesive layer 20 laminated on at least one side of the optical film 10. (1) may be bonded through the adhesive layer (20).

The adhesive layer 20 is usually laminated directly on the surface of the optical film 10. Also, usually, the optical film 1 with an adhesive layer is laminated on the metal layer 30 so that the adhesive layer 20 is in direct contact with the metal layer 30. According to the present invention, corrosion of the metal layer 30 can be effectively suppressed in such an optical laminate. Hereinafter, the property that can suppress corrosion of the metal layer 30 is also referred to as “metal corrosion resistance.”

The optical film 10 may be an optical film with a single-layer structure or an optical film with a multi-layer structure. The adhesive layer 20 is composed of an adhesive composition containing a (meth)acrylic resin (A), a silane compound (B), and an ionic compound (C), and preferably further containing an isocyanate-based crosslinking agent (B). . This adhesive composition may contain another component. In this specification, “(meth)acrylic” means at least one selected from the group consisting of acrylic and methacryl. The same applies to “(meth)acrylate” and “(meth)acryloyl”.

[1] Optical film

The optical film 10 provided with the optical laminate according to the present invention is an optical member constituting the optical film 1 with an adhesive layer, and various optical films (optical properties) that can be incorporated in an image display device such as a liquid crystal display device It may be a film having a ). The optical film 10 may be an optical film with a single-layer structure or an optical film with a multi-layer structure. Specific examples of optical films with a single-layer structure include optical functional films such as retardation films, brightness enhancing films, anti-glare films, anti-reflection films, diffusion films, and light-collecting films, in addition to polarizers. Specific examples of optical films with a multilayer structure include polarizers and retardation plates. In this specification, a polarizing plate refers to a resin film or a resin layer laminated on at least one side of a polarizer. A retardation plate refers to a resin film or a resin layer laminated on at least one side of a retardation film. The optical film 10 is preferably a polarizing plate, polarizer, retardation plate, or retardation film, and more preferably is a polarizing plate or polarizer.

[1-1] Polarizer

Figures 2 and 3 are schematic cross-sectional views showing examples of the layer structure of a polarizing plate. The polarizing plate 10a shown in FIG. 2 is a single-sided protection polarizing plate in which the first resin film 3 is laminated and bonded to one side of the polarizer 2, and the polarizing plate 10b shown in FIG. 3 is a polarizing plate 10b shown in FIG. ) is a double-sided protective polarizing plate in which a second resin film 4 is further laminated and bonded to the other side. The first and second resin films 3 and 4 can be bonded to the polarizer 2 through an adhesive layer or pressure-sensitive adhesive layer (not shown). The polarizing plates 10a and 10b may contain films or layers other than the first and second resin films 3 and 4.

Examples of the layer structure of the optical laminate when the polarizing plates 10a and 10b shown in FIGS. 2 and 3 are used as the optical film 10 are shown in FIGS. 4 and 5, respectively. The optical laminate 5 shown in FIG. 4 is an example of using the polarizing plate 10a shown in FIG. 2 as the optical film 10, and the optical laminate 6 shown in FIG. 5 is shown in FIG. 3. This is an example of using the polarizing plate 10b as the optical film 10.

The polarizer 2 is a film that has the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis), for example, poly A film in which a dichroic dye is adsorbed and oriented on a vinyl alcohol-based resin film can be used. As a dichroic dye, iodine or a dichroic organic dye is used.

Polyvinyl alcohol-based resin can be obtained by saponifying polyvinyl acetate-based resin. Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, as well as a copolymer of vinyl acetate and a monomer copolymerizable with vinyl acetate. Monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamide having an ammonium group.

The saponification degree of the polyvinyl alcohol-based resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The average degree of polymerization of polyvinyl alcohol-based resin is usually 1,000 to 10,000, preferably 1,500 to 5,000. The average degree of polymerization of the polyvinyl alcohol-based resin can be determined based on JIS K 6726.

Usually, a polyvinyl alcohol-based resin film is used as a raw film of the polarizer 2. Polyvinyl alcohol-based resin can be formed into a film by a known method. The thickness of the raw film is usually 1 to 150 μm, and considering ease of stretching, etc., it is preferably 10 μm or more.

The polarizer 2 includes, for example, a process of uniaxially stretching a raw film, a process of dyeing the film with a dichroic dye and adsorbing the dichroic dye, a process of treating the film with an aqueous boric acid solution, and washing the film. The process is carried out, and finally it is dried and manufactured. The thickness of the polarizer 2 is usually 1 to 30 μm, and from the viewpoint of thinning the optical film 1 with an adhesive layer, it is preferably 20 μm or less, more preferably 15 μm or less, and still more preferably 10 μm. It is as follows.

The polarizer 2, which is formed by adsorbing and orienting a dichroic dye on a polyvinyl alcohol-based resin film, 1) uses a single film of the polyvinyl alcohol-based resin film as a raw film, and performs uniaxial stretching treatment and dichroism on this film. In addition to the method of performing dyeing treatment with a pigment, 2) coating a base film with a coating solution (aqueous solution, etc.) containing a polyvinyl alcohol-based resin and drying it to obtain a base film having a polyvinyl alcohol-based resin layer, which is then used as a base film It can also be obtained by uniaxial stretching as a whole, dyeing the polyvinyl alcohol-based resin layer after stretching with a dichroic dye, and then peeling and removing the base film. As the base film, a film made of the same thermoplastic resin as the thermoplastic resin that can constitute the first and second resin films 3 and 4 described later can be used, preferably a polyester-based film such as polyethylene terephthalate. It is a film made of resin, polycarbonate-based resin, cellulose-based resin such as triacetylcellulose, cyclic polyolefin-based resin such as norbornene-based resin, and polystyrene-based resin. According to the method of 2), it becomes easy to manufacture a thin film polarizer 2, and for example, it also becomes easy to manufacture a polarizer 2 with a thickness of 7 μm or less.

The first and second resin films 3 and 4 are each independently made of a light-transmitting, preferably optically transparent thermoplastic resin, such as chain polyolefin-based resin (polyethylene-based resin, polypropylene-based resin, etc.), cyclic polyolefin. polyolefin-based resins such as base resins (norbornene-based resins, etc.); Cellulose-based resins (cellulose ester-based resins, etc.); Polyester resins (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, etc.); polycarbonate-based resin; (meth)acrylic resin; polystyrene-based resin; polyetheretherketone-based resin; It may be a film made of polysulfone-based resin, or a mixture or copolymer thereof. Among them, the first and second resin films 3 and 4 are each made of a resin selected from the group consisting of cyclic polyolefin resin, polycarbonate resin, cellulose resin, polyester resin, and (meth)acrylic resin. It is preferably composed of, and more preferably composed of a resin selected from the group consisting of cellulose resin and cyclic polyolefin resin.

Examples of the linear polyolefin resin include homopolymers of linear olefins such as polyethylene resin and polypropylene resin, as well as copolymers of two or more types of linear olefins.

Cyclic polyolefin resin is a general term for resins containing cyclic olefins such as norbornene, tetracyclododecene (aka: dimethanooctahydronaphthalene) or their derivatives as polymerized units. Specific examples of cyclic polyolefin resins include ring-opening (co)polymers of cyclic olefins and hydrogenated products thereof, addition polymers of cyclic olefins, copolymers of cyclic olefins with chain olefins such as ethylene and propylene, or aromatic compounds having a vinyl group, and modified (co)polymers obtained by modifying these with unsaturated carboxylic acids or their derivatives. Among them, norbornene-based resins using norbornene-based monomers such as norbornene and polycyclic norbornene-based monomers as cyclic olefins are preferably used.

The cellulose resin is preferably a cellulose ester resin, that is, a partially or fully esterified product of cellulose, and examples include acetic acid ester, propionic acid ester, butyric acid ester of cellulose, and mixed esters thereof. Among them, triacetylcellulose, diacetylcellulose, cellulose acetate propionate, cellulose acetate butyrate, etc. are preferably used.

Polyester-based resin is a resin other than the above cellulose ester-based resin that has an ester bond, and is generally composed of a polycondensate of polyhydric carboxylic acid or its derivative and polyhydric alcohol. Specific examples of polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexane dimethyl terephthalate, and polycyclohexane. Contains dimethylnaphthalate.

Polycarbonate-based resin is a polyester formed from carbonic acid and glycol or bisphenol. Among them, aromatic polycarbonate having diphenylalkane in the molecular chain is preferably used from the viewpoints of heat resistance, weather resistance, and acid resistance. As polycarbonate, 2,2-bis(4-hydroxyphenyl)propane (aka bisphenol A), 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)cyclo Polycarbonates derived from bisphenols such as hexane, 1,1-bis(4-hydroxyphenyl)isobutane, and 1,1-bis(4-hydroxyphenyl)ethane are exemplified.

The (meth)acrylic resin that can constitute the first and second resin films 3 and 4 may be a polymer mainly composed of structural units derived from methacrylic acid ester (for example, containing 50% by weight or more of this), , it is preferable that it is a copolymer in which other copolymerization components are copolymerized. The (meth)acrylic resin may contain two or more types of structural units derived from methacrylic acid ester. Examples of methacrylic acid esters include C ₁ to C ₄ alkyl esters of methacrylic acid such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate.

A copolymerization component that can be copolymerized with methacrylic acid ester includes acrylic acid ester. Acrylic acid ester is preferably a C ₁ to C ₈ alkyl ester of acrylic acid such as methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. Specific examples of other copolymerization components include unsaturated acids such as (meth)acrylic acid; Aromatic vinyl compounds such as styrene, halogenated styrene, α-methylstyrene, and vinyl toluene; Vinyl cyan compounds such as (meth)acrylonitrile; Unsaturated acid anhydrides such as maleic anhydride and citraconic anhydride; Compounds other than acrylic acid esters that have one polymerizable carbon-carbon double bond in the molecule include unsaturated imides such as phenylmaleimide and cyclohexylmaleimide. A compound having two or more polymerizable carbon-carbon double bonds in the molecule may be used as a copolymerization component. As for the copolymerization component, only one type may be used or two or more types may be used in combination.

The (meth)acrylic resin may have a ring structure in the polymer main chain since it can increase the durability of the film. The ring structure is preferably a heterocyclic structure such as a cyclic acid anhydride structure, a cyclic imide structure, or a lactone ring structure. Specific examples of cyclic acid anhydride structures include glutaric acid anhydride and succinic anhydride structures, specific examples of cyclic imide structures include glutarimide structure and succinimide structure, and specific examples of lactone ring structures include , butyrolactone ring structure, and valerolactone ring structure, respectively.

The (meth)acrylic resin may contain acrylic rubber particles from the viewpoint of film forming properties and impact resistance of the film. Acrylic rubber particles are particles containing an elastic polymer mainly composed of acrylic acid ester as an essential component, and include those with a single-layer structure substantially composed only of this elastic polymer, and those with a multi-layer structure with the elastic polymer as one layer. Examples of elastic polymers include crosslinked elastic copolymers made by copolymerizing alkyl acrylate as a main component with other copolymerizable vinyl monomers and crosslinkable monomers. Examples of the alkyl acrylate that is the main component of the elastic polymer include C ₁ to C ₈ alkyl esters of acrylic acid such as methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. The carbon number of the alkyl group is preferably 4 or more.

Other vinyl monomers that can be copolymerized with alkyl acrylate include compounds having one polymerizable carbon-carbon double bond in the molecule, and more specifically, methacrylic acid esters such as methyl methacrylate and aromatic monomers such as styrene. Vinyl compounds, vinyl cyan compounds such as (meth)acrylonitrile, etc. can be mentioned. Examples of crosslinkable monomers include crosslinkable compounds having at least two polymerizable carbon-carbon double bonds in the molecule, and more specifically, ethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, etc. (meth)acrylates of polyhydric alcohols, alkenyl esters of (meth)acrylic acid such as allyl (meth)acrylate, and divinylbenzene.

The content of the acrylic rubber particles is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, based on 100 parts by weight of the (meth)acrylic resin. If the content of acrylic rubber particles is too high, the surface hardness of the film may decrease, and further, when the film is subjected to surface treatment, the solvent resistance to the organic solvent in the surface treatment agent may decrease. Therefore, the content of acrylic rubber particles is usually 80 parts by weight or less, and preferably 60 parts by weight or less, based on 100 parts by weight of the (meth)acrylic resin.

The first and second resin films 3 and 4 may contain common additives in the technical field of the present invention. Specific examples of additives include, for example, ultraviolet absorbers, infrared absorbers, organic dyes, pigments, inorganic pigments, antioxidants, antistatic agents, surfactants, lubricants, dispersants, heat stabilizers, etc.

Examples of ultraviolet absorbers include salicylic acid ester compounds, benzophenone compounds, benzotriazole compounds, triazine compounds, cyano (meth)acrylate compounds, nickel complex salts, etc.

The first and second resin films 3 and 4 may be unstretched films or uniaxially or biaxially stretched films, respectively. The biaxial stretching may be simultaneous biaxial stretching in which the material is stretched simultaneously in two stretching directions, or may be sequential biaxial stretching in which the material is stretched in a predetermined direction and then stretched in another direction. The first resin film 3 and/or the second resin film 4 may be a protective film that serves to protect the polarizer 2, or may be a protective film that also has an optical function such as a retardation film described later. there is. A retardation film is an optical film that exhibits optical anisotropy. For example, a retardation film with an arbitrary retardation value can be obtained by stretching the film made of the thermoplastic resin (uniaxial stretching, biaxial stretching, etc.) or forming a liquid crystal layer or the like on the thermoplastic resin film.

The first resin film 3 and the second resin film 4 may be films made of the same thermoplastic resin, or may be films made of different thermoplastic resins. The first resin film 3 and the second resin film 4 may be the same or different in thickness, presence or absence of additives, their types, phase difference characteristics, etc.

The first resin film 3 and/or the second resin film 4 has a hard coat layer, an anti-glare layer, an anti-reflection layer, a light diffusion layer, an anti-static layer, and an anti-fouling layer on its outer surface (the surface opposite to the polarizer 2). , a surface treatment layer (coating layer) such as a conductive layer may be provided.

The thickness of the first resin film 3 and the second resin film 4 is usually 1 to 150 μm, respectively, preferably 5 to 100 μm, and more preferably 5 to 60 μm. The thickness may be 50 μm or less, and may even be 30 μm or less. Reducing the thickness of the first and second resin films 3 and 4 includes thinning the optical film 1 with an adhesive layer and the optical laminated body, and further includes the optical film 1 with an adhesive layer or the optical laminated body. This is advantageous for thinning the liquid crystal display device.

In particular, in polarizers for small and medium-sized devices such as smartphones and tablet-type terminals, thin films with a thickness of 30 μm or less are often used as the first resin film 3 and/or the second resin film 4 due to the requirement for thinning. , the force that suppresses the shrinkage force of the polarizer 2 is weak in such a polarizing plate, and durability is likely to be insufficient. According to the present invention, even when such a polarizing plate is used as the optical film 10, an optical film 1 and an optical laminate with an adhesive layer having good durability can be provided. The durability of the optical film 1 with an adhesive layer and the optical laminate refers to the adhesive layer 20 and the optical members adjacent thereto, for example, in a high temperature environment, in a high temperature and high humidity environment, in an environment where high and low temperatures are repeated, etc. It refers to a property that can suppress problems such as lifting or peeling at the interface and foaming of the adhesive layer 20.

Additionally, from the viewpoint of thinning the polarizing plate, it is advantageous to have a configuration in which the resin film is disposed only on one side of the polarizing plate 2, as in the polarizing plate 10a shown in FIG. 2. In this case, the adhesive layer 20 is usually bonded directly to the other side of the polarizer 2 to form the optical film 1 with an adhesive layer (see Fig. 4). In the case of a polarizing plate with such a structure, the problem of deteriorating the optical performance of the polarizing plate in a high-temperature, high-humidity environment due to the ionic compound contained in the pressure-sensitive adhesive layer 20 becomes particularly significant. According to the present invention, even when such a polarizing plate is used as the optical film 10, an optical film 1 and an optical laminate with an adhesive layer having good optical durability (a property capable of suppressing deterioration of optical properties) can be provided. there is.

The first and second resin films 3 and 4 can be bonded to the polarizer 2 through an adhesive layer or adhesive layer. As an adhesive for forming the adhesive layer, a water-based adhesive or an active energy ray-curable adhesive can be used.

Examples of water-based adhesives include adhesives made of polyvinyl alcohol-based resin aqueous solutions, water-based two-component urethane-based emulsion adhesives, and the like. Among them, a water-based adhesive made of an aqueous solution of polyvinyl alcohol-based resin is suitably used. Polyvinyl alcohol-based resins include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, and polyvinyl alcohol-based copolymers obtained by saponifying copolymers of vinyl acetate and other monomers copolymerizable with it. A polymer or a modified polyvinyl alcohol-based polymer whose hydroxyl groups are partially modified can be used. The water-based adhesive may contain a crosslinking agent such as an aldehyde compound, an epoxy compound, a melamine-based compound, a methylol compound, an isocyanate compound, an amine compound, and a polyvalent metal salt.

When using a water-based adhesive, after bonding the polarizer 2 and the first and second resin films 3 and 4, it is preferable to perform a drying process to remove water contained in the water-based adhesive. After the drying process, a curing process may be provided, for example, curing at a temperature of about 20 to 45°C.

The active energy ray-curable adhesive refers to an adhesive that is cured by irradiating active energy rays such as ultraviolet rays or electron beams, and includes, for example, a curable composition containing a polymerizable compound and a photopolymerization initiator, a curable composition containing a photoreactive resin, and a binder resin. and a curable composition containing a photoreactive crosslinking agent. Preferably it is an ultraviolet curable adhesive. Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy monomers, photocurable (meth)acrylic monomers, and photocurable urethane monomers, and oligomers derived from photopolymerizable monomers. Examples of the photopolymerization initiator include substances that generate active species such as neutral radicals, anion radicals, and cation radicals when irradiated with active energy rays. An active energy ray-curable adhesive containing a polymerizable compound and a photopolymerization initiator, a curable composition containing a photocurable epoxy-based monomer and a photocationic polymerization initiator, or a curable composition containing a photocurable (meth)acrylic monomer and a radical photopolymerization initiator. , or a mixture of these curable compositions can be preferably used.

In the case of using an active energy ray-curable adhesive, after bonding the polarizer 2 and the first and second resin films 3 and 4, a drying process is performed as necessary, and active energy rays are continuously irradiated to produce active energy. A curing process is performed to cure the pre-curable adhesive. The light source of the active energy ray is not particularly limited, but ultraviolet rays having an emission distribution in a wavelength of 400 nm or less are preferable, and specifically, low pressure mercury lamp, medium pressure mercury lamp, high pressure mercury lamp, ultra-high pressure mercury lamp, chemical lamp, black light lamp, microwave excitation. Mercury lamps, metal halide lamps, etc. can be used.

When bonding the polarizer 2 and the first and second resin films 3 and 4, surface activation treatment such as saponification treatment, corona treatment, or plasma treatment can be performed on at least one of these bonding surfaces. When a resin film is bonded to both surfaces of the polarizer 2, the adhesive for bonding these resin films may be the same type of adhesive or may be a different type of adhesive.

The polarizers 10a and 10b may further include other films or layers. Specific examples thereof include, in addition to the retardation film described later, a brightness enhancing film, an anti-glare film, an anti-reflection film, a diffusion film, a light-collecting film, an adhesive layer other than the adhesive layer 20, a coating layer, and a protection film. The protect film is a film used for the purpose of protecting the surface of the optical film 10, such as a polarizing plate, from scratches and contamination, and is peeled and removed after bonding the optical film 1 with an adhesive layer onto, for example, the metal layer 30. It is customary to do so.

A protective film usually consists of a base film and an adhesive layer laminated thereon. The base film includes thermoplastic resins, such as polyolefin resins such as polyethylene resins and polypropylene resins; Polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polycarbonate-based resin; It can be composed of (meth)acrylic resin, etc.

[1-2] Phase difference plate

As described above, the retardation film included in the retardation plate is an optical film that exhibits optical anisotropy, and can be used for the first and second resin films 3 and 4, in addition to the thermoplastic resins exemplified above, such as polyvinyl. Alcohol-based resin, polyarylate-based resin, polyimide-based resin, polyether sulfone-based resin, polyvinylidene fluoride/polymethyl methacrylate-based resin, liquid crystal polyester-based resin, ethylene-vinyl acetate copolymer saponified product, poly It may be a stretched film obtained by stretching a resin film made of vinyl chloride-based resin or the like to about 1.01 to 6 times. Among them, a stretched film obtained by uniaxially stretching or biaxially stretching a polycarbonate-based resin film, cyclic olefin-based resin film, (meth)acrylic-based resin film, or cellulose-based resin film is preferable. In addition, in this specification, a zero retardation film is also included in the retardation film (however, it can also be used as a protective film). In addition, films called uniaxial retardation films, wide viewing angle retardation films, low light modulus retardation films, etc. are also applicable as retardation films.

A zero retardation film refers to a film whose in-plane retardation value (R _e ) and thickness direction retardation value (R _th ) are both -15 to 15 nm. This retardation film is suitably used for IPS mode liquid crystal display devices. The in-plane retardation value (R _e ) and the thickness direction retardation value (R _th ) are preferably both -10 to 10 nm, and more preferably both are -5 to 5 nm. The in-plane retardation value (R _e ) and the thickness direction retardation value (R _th ) mentioned here are values at a wavelength of 590 nm.

The in-plane retardation value (R _e ) and the thickness direction retardation value (R _th ) are each defined by the following equations.

R _e =(n _x -n _y )×d

R _th =[(n _x +n _y )/2-n _z ]×d

_In the formula _{, n} It is the refractive index in the film thickness direction (z-axis direction perpendicular to the film plane), and d is the thickness of the film.

For the zero retardation film, for example, a resin film made of polyolefin resin such as cellulose resin, linear polyolefin resin, and cyclic polyolefin resin, polyethylene terephthalate resin, or (meth)acrylic resin can be used. In particular, cellulose-based resin, polyolefin-based resin, or (meth)acrylic-based resin is preferably used because the retardation value is easy to control and is easy to obtain.

In addition, a film that develops optical anisotropy by applying and aligning a liquid crystalline compound, or a film that develops optical anisotropy by applying an inorganic layered compound can also be used as a retardation film. These retardation films include what is called a temperature-compensated retardation film, as well as a film with obliquely oriented rod-shaped liquid crystals sold under the trade name "NH Film" from JX Nikko Nisseki Energy Co., Ltd., Fujifilm Co., Ltd. A film with obliquely oriented disk-shaped liquid crystals sold under the trade name of “WV Film” from Sumitomo Chemical Co., Ltd., and a film of a fully biaxially oriented type sold under the trade name of “VAC Film” from Sumitomo Chemical Co., Ltd., also from Sumitomo Chemical Co., Ltd. There is a biaxially oriented film sold by Gaku Co., Ltd. under the brand name “new VAC film.”

The resin film laminated on at least one side of the retardation film may be, for example, the protective film described above.

[2] Adhesive layer

The adhesive layer 20 disposed between the optical film 10 and the metal layer 30 is composed of an adhesive composition containing a (meth)acrylic resin (A), a silane compound (B), and an ionic compound (C). , preferably further comprising an isocyanate-based crosslinking agent (D). In this adhesive composition, the silane compound (B) is a silane compound represented by the following formula (I).

In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH ₂ - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or - It may be substituted with C(=O)-, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a carbon number Represents alkoxy groups of 1 to 5.

According to the adhesive layer 20 composed of the adhesive composition described above, corrosion of the metal layer 30 can be suppressed in an optical laminate composed of the adhesive layer 20 and the metal layer 30, and furthermore, the adhesive layer 20 The durability of the layered optical film 1 and the optical laminate can be improved. In addition, according to the adhesive layer 20 composed of the adhesive composition described above, the optical film 1 with the adhesive layer and the optical laminate have good optical properties even when the adhesive layer 20 is directly bonded to the polarizer 2. It can indicate durability.

The thickness of the adhesive layer 20 is usually 2 to 40 μm, and is preferably from the viewpoint of the durability of the optical film 1 with an adhesive layer and the optical laminate, the reworkability of the optical film 1 with an adhesive layer, etc. is 5 to 30 ㎛, more preferably 10 to 25 ㎛. In addition, if the thickness of the adhesive layer 20 is 10 μm or more, the followability of the adhesive layer 20 to dimensional changes of the optical film 10 becomes good, and if the thickness is 25 μm or less, the rework property becomes good.

The adhesive layer 20 preferably exhibits a storage modulus of 0.1 to 5 MPa in a temperature range of 23 to 80°C. Accordingly, the durability of the optical film 1 with an adhesive layer and the optical laminate can be more effectively improved. “Exhibiting a storage elastic modulus of 0.1 to 5 MPa in the temperature range of 23 to 80°C” means that the storage elastic modulus is a value within the above range at any temperature in this range. Since the storage elastic modulus usually gradually decreases as the temperature rises, if the storage elastic moduli at 23°C and 80°C are both within the above range, it can be considered to indicate a storage elastic modulus within the above range at the temperature in this range. The storage modulus of the adhesive layer 20 can be measured using a commercially available viscoelasticity measuring device, for example, the viscoelasticity measuring device “DYNAMIC ANALYZER RDA II” manufactured by REOMETRIC.

[2-1] (meth)acrylic resin (A)

The (meth)acrylic resin (A) is a polymer or copolymer containing as a main component a structural unit derived from a (meth)acrylic monomer (preferably containing 50% by weight or more). (meth)acrylic monomers include, for example, monomers having a (meth)acryloyl group, and preferably include alkyl (meth)acrylate. The alkyl group of the alkyl (meth)acrylate preferably has 1 to 14 carbon atoms, more preferably 1 to 12 carbon atoms, and even more preferably 1 to 8 carbon atoms, and may be linear, branched or cyclic. As the alkyl (meth)acrylate, an alkyl (meth)acrylate containing a substituent, such as an alkyl acrylate containing a substituent in which a substituent is introduced into the alkyl group described later, can also be used. Alkyl (meth)acrylate may be used alone or in combination of two or more types.

Specific examples of alkyl (meth)acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, n- and i-propyl (meth)acrylate, n-, i- and t-butyl (meth)acrylate. Latex, n- and i-pentylacrylate, n- and i-hexyl(meth)acrylate, cyclohexyl(meth)acrylate, n- and i-heptyl(meth)acrylate, n- and i-octyl( Meth)acrylate, 2-ethylhexyl (meth)acrylate, n- and i-nonyl (meth)acrylate, n- and i-decyl (meth)acrylate, isoboronyl (meth)acrylate, n - and i-dodecyl (meth)acrylate, stearyl (meth)acrylate, etc.

The (meth)acrylic resin (A) is a structural unit derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature (Tg) of less than 0°C, and an alkyl acrylate (a2) having a homopolymer Tg of 0°C or more. It is preferable to contain the structural units of This is advantageous in improving the metal corrosion resistance and durability of the optical film 1 with an adhesive layer and the optical laminate. For the Tg of the homopolymer of alkyl acrylate, for example, literature values such as POLYMER HANDBOOK (Wiley-Interscience) can be adopted.

Specific examples of alkyl acrylate (a1) include ethyl acrylate, n- and i-propyl acrylate, n- and i-butylacrylate, n-pentyl acrylate, n- and i-hexyl acrylate, n- The carbon number of alkyl groups such as heptyl acrylate, n- and i-octylacrylate, 2-ethylhexyl acrylate, n- and i-nonyl acrylate, n- and i-decyl acrylate, and n-dodecyl acrylate It contains about 2 to 12 alkyl acrylates. Another specific example of the alkyl acrylate (a1) may be an alkyl acrylate containing a substituent in which a substituent is introduced into the alkyl group in the alkyl group having about 2 to 12 carbon atoms. The substituent of the substituent-containing alkyl acrylate is a group that substitutes 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 the substituent-containing alkyl acrylate include 2-methoxyethyl acrylate, ethoxymethyl acrylate, phenoxyethyl acrylate, and phenoxydiethylene glycol acrylate. The alkyl group of alkyl acrylate (a1) may have an alicyclic structure, but is preferably a linear or branched alkyl group.

Alkyl acrylate (a1) may be used alone or in combination of two or more types. Among these, the alkyl acrylate (a1) preferably contains one or two or more types selected from ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate. From the viewpoint of followability and reworkability of the adhesive layer 20 of the optical film 1 with an adhesive layer to the optical film 10, it is preferable that the alkyl acrylate (a1) contains n-butyl acrylate. .

Alkyl acrylate (a2) is an alkyl acrylate other than alkyl acrylate (a1). Specific examples of alkyl acrylate (a2) include methyl acrylate, cyclohexyl acrylate, isoboronyl acrylate, stearyl acrylate, and t-butyl acrylate.

Alkyl acrylate (a2) may be used alone or in combination of two or more types. Among them, from the viewpoint of metal corrosion resistance and durability, the alkyl acrylate (a2) preferably contains methyl acrylate, cyclohexyl acrylate, isoboronyl acrylate, etc., and preferably contains methyl acrylate. It is more desirable.

The content of the structural unit derived from alkyl acrylate (a2) in the (meth)acrylic resin (A) is (meth) from the viewpoint of metal corrosion resistance and durability of the optical film (1) with an adhesive layer and the optical laminate. Of 100 parts by weight of the total structural units constituting the acrylic resin (A), the amount is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, even more preferably 20 parts by weight or more, and particularly preferably 25 parts by weight. It is more than parts by weight. In addition, from the viewpoint of followability and reworkability of the adhesive layer 20 to the optical film 10, the content of the structural unit derived from alkyl acrylate (a2) is preferably 70 parts by weight or less, more preferably 60 parts by weight. It is 50 parts by weight or less, more preferably 50 parts by weight or less.

The (meth)acrylic resin (A) may contain structural units derived from monomers other than alkyl acrylates (a1) and (a2). The (meth)acrylic resin (A) may contain only one type or two or more types of structural units derived from the other monomers described above. Specific examples of other monomers are shown below.

1) Monomers with polar functional groups.

Examples of the monomer having a polar functional group include (meth)acrylate having a substituent such as a hydroxyl group, a carboxyl group, a substituted or unsubstituted amino group, and a heterocyclic group such as an epoxy group. Specifically, 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-(2-hydroxyethoxy)ethyl (meth)acrylate, Monomers having a hydroxy group such as 2-chloro-2-hydroxypropyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, and diethylene glycol mono(meth)acrylate; Acryloylmorpholine, vinylcaprolactam, N-vinyl-2-pyrrolidone, vinylpyridine, tetrahydrofurfuryl (meth)acrylate, caprolactone modified tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexyl Monomers having a heterocyclic group such as methyl (meth)acrylate, glycidyl (meth)acrylate, and 2,5-dihydrofuran; Monomers having a substituted or unsubstituted amino group such as aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and dimethylaminopropyl (meth)acrylate; Monomers having a carboxyl group such as (meth)acrylic acid and carboxyethyl (meth)acrylate can be mentioned. Among these, monomers having a hydroxy group are preferable, and (meth)acrylates having a hydroxy group are more preferable from the viewpoint of reactivity between the (meth)acrylic resin (A) and the crosslinking agent.

In addition to the (meth)acrylate having a hydroxy group, it may contain a monomer having the other polar functional groups described above. However, from the viewpoint of preventing an increase in the peeling force of the separate film that can be laminated on the outer surface of the adhesive layer 20, an amino group is used. It is preferable that it contains substantially no monomers. Additionally, from the viewpoint of increasing corrosion resistance to ITO, it is preferable that the monomer having a carboxyl group is substantially not included. Here, not substantially included means that it is 0.1 part by weight or less out of 100 parts by weight of all structural units constituting the (meth)acrylic resin (A).

2) Acrylamide monomer.

For example, N-methylolacrylamide, N-(2-hydroxyethyl)acrylamide, N-(3-hydroxypropyl)acrylamide, N-(4-hydroxybutyl)acrylamide, N-(5- Hydroxypentyl)acrylamide, N-(6-hydroxyhexyl)acrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N-isopropylacrylamide, N-(3-dimethylamino) Propyl)acrylamide, N-(1,1-dimethyl-3-oxobutyl)acrylamide, N-[2-(2-oxo-1-imidazolidinyl)ethyl]acrylamide, 2-acryloylamino -2-methyl-1-propanesulfonic acid, N-(methoxymethyl)acrylamide, N-(ethoxymethyl)acrylamide, N-(propoxymethyl)acrylamide, N-(1-methylethoxymethyl) Acrylamide, N-(1-methylpropoxymethyl)acrylamide, N-(2-methylpropoxymethyl)acrylamide [alias: N-(isobutoxymethyl)acrylamide], N-(butoxymethyl)acrylamide Amide, N-(1,1-dimethylethoxymethyl)acrylamide, N-(2-methoxyethyl)acrylamide, N-(2-ethoxyethyl)acrylamide, N-(2-propoxyethyl) Acrylamide, N-[2-(1-methylethoxy)ethyl]acrylamide, N-[2-(1-methylpropoxy)ethyl]acrylamide, N-[2-(2-methylpropoxy)ethyl ]Acrylamide [alias: N-(2-isobutoxyethyl)acrylamide], N-(2-butoxyethyl)acrylamide, N-[2-(1,1-dimethylethoxy)ethyl]acrylamide, etc. . Among them, N-(methoxymethyl)acrylamide, N-(ethoxymethyl)acrylamide, N-(propoxymethyl)acrylamide, N-(butoxymethyl)acrylamide, and N-(2-methylpropyl). Oxymethyl)acrylamide is preferably used.

3) Methacrylate, i.e. methacrylic acid ester.

For example, linear alkyl esters of methacrylic acid such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, and lauryl methacrylate; Branched alkyl esters of methacrylic acid such as isobutyl methacrylate, 2-ethylhexyl methacrylate, and i-octyl methacrylate; Isobornyl methacrylate, cyclohexyl methacrylate, dicyclopentanyl methacrylate, cyclododecyl methacrylate, methylcyclohexyl methacrylate, trimethylcyclohexyl methacrylate, t-butylcyclohexyl methacrylate, Alicyclic alkyl esters of methacrylic acid such as cyclohexylphenyl methacrylate; Alkoxyalkyl esters of methacrylic acid such as 2-methoxyethyl methacrylate and ethoxymethyl methacrylate; Methacrylic acid aralkyl esters such as benzyl methacrylate; 2-Hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 2-(2-hydroxyethoxy)ethyl methacrylate, 2-chloro-2-hydroxy Alkyl esters of methacrylic acid having a hydroxyl group, such as propyl methacrylate, 3-chloro-2-hydroxypropyl methacrylate, and diethylene glycol monomethacrylate; Alkyl esters of methacrylic acid having a substituted or unsubstituted amino group, such as aminoethyl methacrylate, N,N-dimethylaminoethyl methacrylate, and dimethylaminopropyl methacrylate; 2-Phenoxyethyl methacrylate, 2-(2-phenoxyethoxy)ethyl methacrylate, ethylene oxide-modified nonylphenol ester of (meth)acrylic acid, 2-(o-phenylphenoxy)ethyl methacrylate, etc. Ester of methacrylic acid having a phenoxyethyl group, etc.

4) Methacrylamide monomer.

For example, a methacrylamide-based monomer corresponding to the acrylamide-based monomer described in 1) above.

5) Styrenic monomer.

For example, styrene; Alkyl styrene, such as methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, triethyl styrene, propyl styrene, butyl styrene, hexyl styrene, heptyl styrene, and octyl styrene; Halogenated styrene such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene, and iodostyrene; nitrostyrene; acetylstyrene; methoxystyrene; Divinylbenzene, etc.

6) Vinyl monomer.

For example, fatty acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, and vinyl laurate; Vinyl halides such as vinyl chloride and vinyl bromide; Vinylidene halides such as vinylidene chloride; nitrogen-containing aromatic vinyl such as vinylpyridine, vinylpyrrolidone, and vinylcarbazole; Conjugated diene monomers such as butadiene, isoprene, and chloroprene; Unsaturated nitriles such as acrylonitrile and methacrylonitrile.

7) A monomer having multiple (meth)acryloyl groups in the molecule.

For example, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, di Monomers having two (meth)acryloyl groups in the molecule such as ethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, and tripropylene glycol di(meth)acrylate; Monomers having three (meth)acryloyl groups in the molecule, such as trimethylolpropane tri(meth)acrylate.

As described above, the (meth)acrylic resin (A) is in addition to the structural units derived from alkyl (meth)acrylate from the viewpoint of durability and metal corrosion resistance of the optical film 1 with an adhesive layer and the optical laminated body. , it is preferable to include a structural unit derived from a monomer having a polar functional group. The monomer having a polar functional group is preferably a (meth)acrylate-based monomer having a polar functional group, and more preferably a monomer having a hydroxyl group. The content of the structural unit derived from a monomer having a polar functional group is preferably 0.1 to 10 parts by weight, more preferably 0.25 to 5 parts by weight, based on 100 parts by weight of all structural units constituting the (meth)acrylic resin (A). Parts by weight, more preferably 0.5 to 5 parts by weight.

In addition, from the viewpoint of the reworkability of the optical film 1 with an adhesive layer, the (meth)acrylic resin (A) is derived from methacrylic monomers such as methacrylate (methacrylic acid ester) and methacrylamide monomer. It is preferable that the content of the structural unit is small, and specifically, the content of the structural unit is preferably 10 parts by weight or less out of 100 parts by weight of the precursor unit constituting the (meth)acrylic resin (A), More preferably, it is 5 parts by weight or less, and it is even more preferable that it substantially does not contain the above structural units (0.1 parts by weight or less).

The (meth)acrylic resin (A) preferably has a single peak in the weight average molecular weight (Mw) range of 10 million to 2.5 million on the discharge curve in gel permeation chromatography (GPC), and has a Mw range of 10 million to 2.5 million. It is more preferable that it has a single peak and also contains structural units derived from alkyl acrylates (a1) and (a2). The adhesive layer 20 using such (meth)acrylic resin (A) as a base polymer is advantageous in improving the durability of the optical film 1 with an adhesive layer and the optical laminate. When the number of peaks in the above Mw range is 2 or more, sufficient durability tends not to be obtained.

In determining the peak number of the GPC emission curve in the range of Mw 10 million to 2.5 million, the emission curve is acquired according to the GPC measurement conditions described in the Examples section. “Has a single peak” in the above range of the obtained emission curve means that it has only one maximum value in the range of Mw 10 million to 2.5 million. In this specification, in the GPC discharge curve, an S/N ratio of 30 or more is defined as a peak.

The (meth)acrylic resin (A) preferably has an Mw in the range of 500,000 to 2.5 million, more preferably 600,000 to 2,000,000, as calculated by GPC in terms of standard polystyrene. When Mw is 500,000 or more, it is advantageous for improving the metal corrosion resistance and durability of the optical film 1 with an adhesive layer and the optical laminate, and the reworkability of the optical film 1 with an adhesive layer also tends to improve. In addition, when Mw is 2.5 million or less, the followability of the adhesive layer 20 to the dimensional change of the optical film 10 becomes good. The molecular weight distribution expressed by the ratio Mw/Mn of the weight average molecular weight (Mw) and the number average molecular weight (Mn) is usually 2 to 10. Mw and Mn of the (meth)acrylic resin (A) are determined according to the GPC measurement conditions described in the Examples section.

When the (meth)acrylic resin (A) is dissolved in ethyl acetate to form a solution with a concentration of 20% by weight, the viscosity at 25°C is preferably 20 Pa·s or less, and more preferably 0.1 to 7 Pa·s. desirable. A viscosity in this range is advantageous for improving the durability of the optical film 1 with an adhesive layer and the optical laminated body, and for the reworkability of the optical film 1 with an adhesive layer. The viscosity can be measured using a Brookfield viscometer.

The (meth)acrylic resin (A) preferably has a glass transition temperature (Tg) of -60 to -10°C, as measured by differential scanning calorimetry (DSC), and more preferably -55 to -15°C. Tg in this range is advantageous for improving the metal corrosion resistance and durability of the optical film 1 with an adhesive layer and the optical laminated body.

The adhesive composition may contain two or more types of (meth)acrylic resin belonging to (meth)acrylic resin (A). Additionally, the adhesive composition may contain another (meth)acrylic resin that is different from the (meth)acrylic resin (A). However, from the viewpoint of metal corrosion resistance and durability of the optical film 1 with an adhesive layer and the optical laminate, the content of (meth)acrylic resin (A) is preferably 70% out of the total of all (meth)acrylic resins. It is % by weight or more, more preferably 80 % by weight or more, and even more preferably 90 % by weight or more, and it is particularly preferable that the pressure-sensitive adhesive composition contains only the (meth)acrylic resin (A) as the base polymer.

The (meth)acrylic resin (A) and other (meth)acrylic resins that can be used in combination as needed can be manufactured by known methods such as solution polymerization, bulk polymerization, suspension polymerization, and emulsion polymerization. You can. In the production of (meth)acrylic resin, a polymerization initiator is usually used. The polymerization initiator is used in an amount of about 0.001 to 5 parts by weight based on a total of 100 parts by weight of all monomers used in the production of (meth)acrylic resin. In addition, (meth)acrylic resin may be manufactured, for example, by a method in which polymerization is carried out using active energy rays such as ultraviolet rays.

As a polymerization initiator, a thermal polymerization initiator, a photopolymerization initiator, etc. are used. Examples of the photopolymerization initiator include 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl)ketone. As a thermal polymerization initiator, for example, 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane-1-carbonitrile) ), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxyvaleronitrile), dimethyl-2,2'- Azo compounds such as azobis(2-methylpropionate) and 2,2'-azobis(2-hydroxymethylpropionitrile); Lauryl peroxide, t-butyl hydroperoxide, benzoyl peroxide, t-butyl peroxybenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, dipropyl peroxydicarbonate, t-butyl peroxyneodecanoate. , organic peroxides such as t-butylperoxypivalate, (3,5,5-trimethylhexanoyl)peroxide; Examples include inorganic peroxides such as potassium persulfate, ammonium persulfate, and hydrogen peroxide. Additionally, a redox-based initiator using a combination of peroxide and a reducing agent can also be used as a polymerization initiator.

As a method for producing (meth)acrylic resin, the solution polymerization method is preferable among the methods shown above. An example of the solution polymerization method is to mix the monomers and organic solvent to be used, add a thermal polymerization initiator under a nitrogen atmosphere, and stir at about 40 to 90°C, preferably about 50 to 80°C, for about 3 to 15 hours. . To control the reaction, the monomer or thermal polymerization initiator may be added continuously or intermittently during polymerization, or may be added while dissolved in an organic solvent. Organic solvents include, for example, aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; Aliphatic alcohols such as propyl alcohol and isopropyl alcohol; Ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone can be used.

[2-2] Silane compound (B)

The adhesive composition contains a silane compound (B). The silane compound (B) is a silane compound represented by the following formula (I).

In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH ₂ - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or -C. It may be substituted with (=O)-, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or 1 carbon number. It represents an alkoxy group of ~5.

According to the pressure-sensitive adhesive layer 20 containing the silane compound (B) represented by the formula (I), the metal corrosion resistance and durability of the optical film 1 and the optical laminate with the pressure-sensitive adhesive layer are improved compared to the case of using other silane compounds. can be increased, and further, the adhesion between the adhesive layer 20 and the metal layer 30 or the glass substrate can be increased. Two or more types of silane compounds (B) may be used.

Specific examples of alkanediyl groups having 1 to 20 carbon atoms that can constitute A in the formula (I) include methylene group, 1,2-ethanediyl group, 1,3-propanediyl group, and 1,4-butanediyl group. Diary, 1,5-pentanediyl group, 1,6-hexanediyl group, 1,7-heptanediyl group, 1,8-octanediyl group, 1,9-nonanediyl group, 1,10-decanediyl group, Includes 1,12-dodecanediyl group, 1,14-tetradecanediyl group, 1,16-hexadecanediyl group, 1,18-octadecanediyl group, and 1,20-icosanediyl group. Specific examples of the divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms include 1,3-cyclopentanediyl group and 1,4-cyclohexanediyl group. Specific examples of groups in which -CH ₂ - constituting the alkanediyl group and the alicyclic hydrocarbon group are substituted with -O- or -C(=O)- are -CH ₂ CH ₂ -O-CH ₂ CH ₂ - , -CH ₂ CH ₂ -O-CH ₂ CH ₂ -O-CH ₂ CH ₂ -, -CH ₂ CH ₂ -O-CH ₂ CH ₂ -O-CH ₂ CH ₂ -O-CH ₂ CH ₂ -, -CH ₂ CH ₂ -C(=O)-O-CH ₂ CH ₂ -, -CH ₂ CH ₂ -O-CH ₂ CH ₂ -C(=O)-O-CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ -O-CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ -O-CH ₂ CH ₂ CH ₂ CH ₂ -.

Alkyl groups having 1 to 5 carbon atoms that can constitute R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ in the formula (I) include methyl group, ethyl group, n- and i-propyl group, n -, i- and t-butyl groups, and various pentyl groups such as n-, i- and t-pentyl groups, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ in the formula (I) are Alkoxy groups having 1 to 5 carbon atoms that can be formed include methoxy group, ethoxy group, n-propoxy group, i-propoxy group, n-butoxy group, i-butoxy group, t-butoxy group, n-, i - and various pentyloxy groups such as t-pentyloxy groups. The carbon number of the alkyl group and the alkoxy group is each independently preferably 1 to 4, more preferably 1 to 3, and still more preferably 1 or 2.

Specific examples of the silane compound represented by the formula (I) are shown below.

Bis(trimethoxysilyl)methane,

Bis(triethoxysilyl)methane,

Bis(tripropoxysilyl)methane,

Bis(tributoxysilyl)methane,

Bis(tripentyloxysilyl)methane,

Bis(dimethoxymethylsilyl)methane,

Bis(dimethoxyethylsilyl)methane,

Bis(dimethoxypropylsilyl)methane,

Bis(dimethoxyethylsilyl)methane,

Bis(dimethoxypropylsilyl)methane,

Bis(diethoxymethylsilyl)methane,

Bis(dipropoxymethylsilyl)methane,

Bis(methoxydimethylsilyl)methane,

1-(trimethylsilyl)-1-(methoxydimethylsilyl)methane,

1-(trimethylsilyl)-1-(dimethoxymethylsilyl)methane,

1-(trimethoxysilyl)-1-(triethoxysilyl)methane,

Bis(dimethoxyethoxysilyl)methane,

1,2-bis(trimethoxysilyl)ethane,

1,2-bis(triethoxysilyl)ethane,

1,2-bis(tripropoxysilyl)ethane,

1,2-bis(tributoxysilyl)ethane,

1,2-bis(tripentyloxysilyl)ethane,

1,2-bis(dimethoxymethylsilyl)ethane,

1,2-bis(dimethoxyethylsilyl)ethane,

1,2-bis(dimethoxypropylsilyl)ethane,

1,2-bis(diethoxymethylsilyl)ethane,

1,2-bis(dipropoxymethylsilyl)ethane,

1,2-bis(methoxydimethylsilyl)ethane,

1-(trimethylsilyl)-2-(methoxydimethylsilyl)ethane,

1-(trimethylsilyl)-2-(dimethoxymethylsilyl)ethane,

1-(trimethoxysilyl)-2-(triethoxysilyl)ethane,

1,2-bis(dimethoxyethoxysilyl)ethane,

1,3-bis(trimethoxysilyl)propane,

1,3-bis(triethoxysilyl)propane,

1,3-bis(tripropoxysilyl)propane,

1,4-bis(trimethoxysilyl)butane,

1,4-bis(triethoxysilyl)butane,

1,4-bis(tripropoxysilyl)butane,

1,4-bis(tributoxysilyl)butane,

1,4-bis(tripentyloxysilyl)butane,

1,4-bis(dimethoxymethylsilyl)butane,

1,4-bis(dimethoxyethylsilyl)butane,

1,4-bis(dimethoxypropylsilyl)butane,

1,4-bis(diethoxymethylsilyl)butane,

1,4-bis(dipropoxymethylsilyl)butane,

1,4-bis(methoxydimethylsilyl)butane,

1-(trimethylsilyl)-4-(methoxydimethylsilyl)butane,

1-(trimethylsilyl)-4-(dimethoxymethylsilyl)butane,

1-(trimethoxysilyl)-4-(triethoxysilyl)butane,

1,4-bis(dimethoxyethoxysilyl)butane,

1,5-bis(trimethoxysilyl)pentane,

1,5-bis(triethoxysilyl)pentane,

1,5-bis(tripropoxysilyl)pentane,

1,6-bis(trimethoxysilyl)hexane,

1,6-bis(triethoxysilyl)hexane,

1,6-bis(tripropoxysilyl)hexane,

1,6-bis(tributoxysilyl)hexane,

1,6-bis(tripentyloxysilyl)hexane,

1,6-bis(dimethoxymethylsilyl)hexane,

1,6-bis(dimethoxyethylsilyl)hexane,

1,6-bis(dimethoxypropylsilyl)hexane,

1,6-bis(dimethoxyethylsilyl)hexane,

1,6-bis(dimethoxypropylsilyl)hexane,

1,6-bis(diethoxymethylsilyl)hexane,

1,6-bis(dipropoxymethylsilyl)hexane,

1,6-bis(methoxydimethylsilyl)hexane,

1-(trimethylsilyl)-6-(methoxydimethylsilyl)hexane,

1-(trimethylsilyl)-6-(dimethoxymethylsilyl)hexane,

1-(trimethoxysilyl)-6-(triethoxysilyl)hexane,

1,6-bis(dimethoxyethoxysilyl)hexane,

1,8-bis(trimethoxysilyl)octane,

1,8-bis(triethoxysilyl)octane,

1,8-bis(tripropoxysilyl)octane,

1,8-bis(tributoxysilyl)octane,

1,8-bis(tripentyloxysilyl)octane,

1,8-bis(dimethoxymethylsilyl)octane,

1,8-bis(dimethoxyethylsilyl)octane,

1,8-bis(dimethoxypropylsilyl)octane,

1,8-bis(dimethoxyethylsilyl)octane,

1,8-bis(dimethoxypropylsilyl)octane,

1,8-bis(diethoxymethylsilyl)octane,

1,8-bis(dipropoxymethylsilyl)octane,

1,8-bis(methoxydimethylsilyl)octane,

1-(trimethylsilyl)-8-(methoxydimethylsilyl)octane,

1-(trimethylsilyl)-8-(dimethoxymethylsilyl)octane,

1-(trimethoxysilyl)-8-(triethoxysilyl)octane,

1,8-bis(dimethoxyethoxysilyl)octane,

1,10-bis(trimethoxysilyl)decane,

1,12-bis(trimethoxysilyl)dodecane,

1,14-bis(trimethoxysilyl)tetradecane,

1,16-bis(trimethoxysilyl)hexadecane,

1,18-bis(trimethoxysilyl)octadecane,

1,20-bis(trimethoxysilyl)icosane, etc.

Among them, from the viewpoint of metal corrosion resistance of the optical film 1 with an adhesive layer and the optical laminate, and adhesion between the adhesive layer 20 and the metal layer 30 or the glass substrate, the silane compound (B) is of the following formula ( It is preferable that it is a silane compound represented by II).

(In the formula, R ¹ , R ³ , R ⁴ , R ⁵ and R ⁶ each have the same meaning as above, R ⁷ represents an alkyl group having 1 to 5 carbon atoms, and m represents an integer of 1 to 20.)

Specific examples of the alkyl group having 1 to 5 carbon atoms that can constitute R ⁷ are the same as above. From the same viewpoint as above, the silane compound (B) is more preferably a silane compound represented by the above formula (II) where m is an integer of 4 to 20, and m is an integer of 6 to 8. It is more preferable that the silane compound is 1,6-bis(trimethoxysilyl)hexane, 1,6-bis(triethoxysilyl)hexane, 1,8-bis(trimethoxysilyl)octane, 1, 8-bis(triethoxysilyl)octane, etc., where m is an integer of 6 to 8, and OR ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and OR ⁷ each independently have 1 to 3 carbon atoms. It is particularly preferable that it is a silane compound represented by the above formula (II) (for example, having 1 or 2 carbon atoms). Examples of suitable m are 6 or 8.

The adhesive composition may contain one or two or more types of other silane compounds in addition to the silane compound (B) represented by the formula (I). Other silane compounds include, for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, 3-glycidoxypropyltrimethoxysilane, and 3-glycidoxypropyltri. Ethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropylmethyldimethoxy Silane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, etc. are mentioned.

Other silane compounds may include those of the silicone oligomer type. Specific examples of silicone oligomers are expressed in the form of a combination of monomers as follows.

3-mercaptopropyltrimethoxysilane-tetramethoxysilane oligomer,

3-Mercaptopropyltrimethoxysilane-tetraethoxysilane oligomer,

3-mercaptopropyltriethoxysilane-tetramethoxysilane oligomer,

3-mercaptopropyltriethoxysilane-tetraethoxysilane oligomer

oligomers containing a mercaptopropyl group, such as;

Mercaptomethyltrimethoxysilane-tetramethoxysilane oligomer,

Mercaptomethyltrimethoxysilane-tetraethoxysilane oligomer,

Mercaptomethyltriethoxysilane-tetramethoxysilane oligomer,

Mercaptomethyltriethoxysilane-tetraethoxysilane oligomer

oligomers containing a mercaptomethyl group, such as;

3-glycidoxypropyltrimethoxysilane-tetramethoxysilane copolymer,

3-glycidoxypropyltrimethoxysilane-tetraethoxysilane copolymer,

3-glycidoxypropyltriethoxysilane-tetramethoxysilane copolymer,

3-glycidoxypropyltriethoxysilane-tetraethoxysilane copolymer,

3-glycidoxypropylmethyldimethoxysilane-tetramethoxysilane copolymer,

3-glycidoxypropylmethyldimethoxysilane-tetraethoxysilane copolymer,

3-Glycidoxypropylmethyldiethoxysilane-tetramethoxysilane copolymer,

3-Glycidoxypropylmethyldiethoxysilane-tetraethoxysilane copolymer

copolymers containing 3-glycidoxypropyl groups, such as;

3-methacryloyloxypropyltrimethoxysilane-tetramethoxysilane oligomer,

3-methacryloyloxypropyltrimethoxysilane-tetraethoxysilane oligomer,

3-methacryloyloxypropyltriethoxysilane-tetramethoxysilane oligomer,

3-methacryloyloxypropyltriethoxysilane-tetraethoxysilane oligomer,

3-methacryloyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer,

3-methacryloyloxypropylmethyldimethoxysilane-tetraethoxysilane oligomer,

3-methacryloyloxypropylmethyldiethoxysilane-tetramethoxysilane oligomer,

3-Methacryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer

oligomers containing methacryloyloxypropyl groups, such as;

3-acryloyloxypropyltrimethoxysilane-tetramethoxysilane oligomer,

3-acryloyloxypropyltrimethoxysilane-tetraethoxysilane oligomer,

3-acryloyloxypropyltriethoxysilane-tetramethoxysilane oligomer,

3-acryloyloxypropyltriethoxysilane-tetraethoxysilane oligomer,

3-acryloyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer,

3-acryloyloxypropylmethyldimethoxysilane-tetraethoxysilane oligomer,

3-acryloyloxypropylmethyldiethoxysilane-tetramethoxysilane oligomer,

3-Acryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer

Oligomers containing acryloyloxypropyl groups, such as;

Vinyltrimethoxysilane-tetramethoxysilane oligomer,

Vinyltrimethoxysilane-tetraethoxysilane oligomer,

Vinyltriethoxysilane-tetramethoxysilane oligomer,

Vinyltriethoxysilane-tetraethoxysilane oligomer,

Vinylmethyldimethoxysilane-tetramethoxysilane oligomer,

Vinylmethyldimethoxysilane-tetraethoxysilane oligomer,

Vinylmethyldiethoxysilane-tetramethoxysilane oligomer,

Vinylmethyldiethoxysilane-tetraethoxysilane oligomer

Vinyl group-containing oligomers such as;

3-Aminopropyltrimethoxysilane-tetramethoxysilane copolymer,

3-Aminopropyltrimethoxysilane-tetraethoxysilane copolymer,

3-Aminopropyltriethoxysilane-tetramethoxysilane copolymer,

3-Aminopropyltriethoxysilane-tetraethoxysilane copolymer,

3-Aminopropylmethyldimethoxysilane-tetramethoxysilane copolymer,

3-Aminopropylmethyldimethoxysilane-tetraethoxysilane copolymer,

3-Aminopropylmethyldiethoxysilane-tetramethoxysilane copolymer,

3-Aminopropylmethyldiethoxysilane-tetraethoxysilane copolymer

Copolymers containing amino groups, etc.

However, from the viewpoint of metal corrosion resistance of the optical film 1 with an adhesive layer and the optical laminate, and adhesion between the adhesive layer 20 and the metal layer 30 or the glass substrate, the silane compound represented by the above formula (I) ( The content of B) is preferably 70% by weight or more, more preferably 80% by weight or more, and still more preferably 90% by weight or more, of the total of all silane compounds, and the adhesive composition contains silane as the silane compound. It is particularly preferred to contain only compound (B).

The content of the silane compound (B) in the adhesive composition is usually 0.01 to 10 parts by weight, preferably 0.03 to 5 parts by weight, and more preferably 0.03 to 5 parts by weight, based on 100 parts by weight of the (meth)acrylic resin (A). It is 0.05 to 2 parts by weight, more preferably 0.1 to 1 part by weight. When the content of the silane compound (B) is 0.01 part by weight or more, the effect of improving the metal corrosion resistance of the optical film 1 with an adhesive layer and the optical laminate, and the interaction between the adhesive layer 20 and the metal layer 30 or the glass substrate, etc. The effect of improving adhesion is easy to obtain. Additionally, if the content is 10 parts by weight or less, bleeding out of the silane compound (B) from the adhesive layer 20 can be suppressed.

[2-3] Ionic compound (C)

The adhesive composition contains an ionic compound (C). By containing the ionic compound (C), antistatic performance can be provided to the adhesive layer 20. Conventionally, when the adhesive layer 20 containing an ionic compound is laminated on the metal layer 30, the metal layer 30 may corrode in a high temperature and high humidity environment. However, according to the present invention, an adhesive capable of suppressing the corrosion is used. A layered optical film (1) and an optical laminate can be provided. An ionic compound (C) is a compound composed of cations and anions. The cation may be either an organic cation or an inorganic cation, and the anion may be an organic anion or an inorganic anion. The adhesive composition may contain one or two or more types of ionic compounds (C).

Specific examples of organic cations include pyridinium cation, imidazolium cation, piperidinium cation, pyrrolidinium cation, tetrahydropyridinium cation, dihydropyridinium cation, tetrahydropyrimidinium cation, and dihydropyrimidinium. Cations include pyrazolium cation, pyrazolinium cation, ammonium cation, sulfonium cation, phosphonium cation, etc. The organic cation may have a substituent. Specific examples of inorganic cations include alkali metal ions such as lithium cation [Li ⁺ ], sodium cation [Na ⁺ ], potassium cation [K ⁺ ], and cesium cation [Cs ⁺ ]; It includes alkaline earth metal ions such as beryllium cation [Be ²⁺ ], magnesium cation [Mg ²⁺ ], and calcium cation [Ca ²⁺ ].

Among them, the cation is preferably an organic cation from the viewpoint of compatibility with the (meth)acrylic resin (A), and from the viewpoint of antistatic performance, pyridinium cation, imidazolium cation, piperidinium cation, pyridinium cation, Organic cations containing nitrogen atoms, such as tetrahydropyridinium cation, dihydropyridinium cation, tetrahydropyrimidinium cation, dihydropyrimidinium cation, pyrazolium cation, pyrazolinium cation, and ammonium cation (may have a substituent) ) is more preferable, and it is more preferable that it is a cation having a nitrogen atom-containing heterocyclic structure containing an unsaturated bond.

A suitable specific example of the pyridinium cation, which is a type of cation having a nitrogen atom-containing heterocyclic structure containing an unsaturated bond and may have a substituent, is the pyridinium cation represented by the following formula (III).

In the above formula (III), R ⁸ to R ¹³ are each independently a hydrogen atom, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, an alkynyl group which may have a substituent, an aryl group which may have a substituent, It represents a heterocyclic group, hydroxyl group, ether group, carboxyl group, carbonyl group, or halogen atom which may have a substituent, and adjacent substituents may form a ring.

The alkyl group that may have a substituent is preferably an alkyl group having 1 to 30 carbon atoms, and specific examples thereof include, for example, methyl group, ethyl group, propyl group, butyl group, hexyl group, octyl group, decyl group, dodecyl group, and octade group. Syl group, isopropyl group, isobutyl group, sec-butyl group, t-butyl group, 1-ethylpentyl group, cyclopentyl group, cyclohexyl group, trifluoromethyl group, 2-ethylhexyl group, phenacyl group, 1- Naphthoylmethyl group, 2-naphthoylmethyl group, 4-methylsulfanylphenacyl group, 4-phenylsulfanylphenacyl group, 4-dimethylaminophenacyl group, 4-cyanophenacyl group, 4-methylphenacyl group, 2-methylphena It includes silyl group, 3-fluorophenacyl group, 3-trifluoromethylphenacyl group, and 3-nitrophenacyl group.

The alkenyl group that may have a substituent is preferably an alkenyl group having 2 to 10 carbon atoms, and specific examples include, for example, a vinyl group, an allyl group, and a styryl group. The alkynyl group that may have a substituent is preferably an alkynyl group having 2 to 10 carbon atoms, and specific examples include, for example, an ethynyl group, propynyl group, and propargyl group.

The aryl group that may have a substituent is preferably an aryl group having 6 to 30 carbon atoms, and specific examples thereof include phenyl group, biphenyl group, 1-naphthyl group, 2-naphthyl group, 9-anthryl group, and 9-phenene. Toryl group, 1-pyrenyl group, 5-naphthacenyl group, 1-indenyl group, 2-azulenyl group, 9-fluorenyl group, terphenyl group, quarterphenyl group, o-, m-, and p-tolyl group, Silyl group, o-, m-, and p-cumenyl group, mesityl group, pentalenyl group, binaphthalenyl group, ternapthalenyl group, quarternaphthalenyl group, hepthalenyl group, biphenylenyl group, indacenyl group, Fluoranthenyl group, acenaphthylenyl group, aceanthrylenyl group, phenalenyl group, fluorenyl group, anthryl group, bianthracenyl group, teranthracenyl group, quarteranthracenyl group, anthraquinolyl group, phenanthryl group , triphenylenyl group, pyrenyl group, chrysenyl group, naphthacenyl group, pleiadenyl group, picenyl group, perylenyl group, pentaphenyl group, pentacenyl group, tetraphenylenyl group, hexaphenyl group, hexacenyl group, rubisenyl group. group, colonenyl group, trinaphthylenyl group, heptaphenyl group, heptasenyl group, pyranthrenyl group, and ovalenyl group.

The heterocyclic group that may have a substituent is preferably an aromatic or aliphatic heterocycle containing a nitrogen atom, an oxygen atom, a sulfur atom, or a phosphorus atom, and specific examples thereof include, for example, a thienyl group and a benzo[b]thienyl group. , naphtho[2,3-b]thienyl group, thianthrenyl group, furyl group, pyranyl group, isobenzofuranyl group, chromenyl group, xanthenyl group, phenoxathiinyl group, 2H-pyrrolyl group, pyrrolyl group, imy Dazolyl group, pyrazolyl group, pyridyl group, pyrazinyl group, pyrimidinyl group, pyridazinyl group, indolizinyl group, isoindolyl group, 3H-indolyl group, indolyl group, 1H-indazolyl group, purinyl group , 4H-quinolizinyl group, isoquinolyl group, quinolyl group, phthalazinyl group, naphthyrizinyl group, quinoxanilyl group, quinazolinyl group, cinnolinyl group, pteridinyl group, 4aH-carbazolyl group, carbazolyl group, β-carbolinyl group, phenanthridinyl group, acridinyl group, perimidinyl group, phenanthrolinyl group, phenazinyl group, phenarxazinyl group, isothiazolyl group, phenothiazinyl group, Isoxazolyl group, furazanyl group, phenoxazinyl group, isochromanyl group, chromanyl group, pyrrolidinyl group, pyrrolinyl group, imidazolidinyl group, imidazolinyl group, pyrazolidinyl group, pyrazolidinyl group, It includes a piperidyl group, piperazinyl group, indolinyl group, isoindolinyl group, quinuclidinyl group, morpholinyl group, and thioxantolyl group.

A substituent that can substitute the hydrogen atom of the alkyl group that may have a substituent, an alkenyl group that may have a substituent, an alkynyl group that may have a substituent, an aryl group that may have a substituent, and a heterocyclic group that may have a substituent. Specific examples include, for example, halogen atoms such as fluorine atom, chlorine atom, bromine atom, and iodine atom; Alkoxy groups such as methoxy group, ethoxy group, and t-butoxy group; Aryloxy groups such as phenoxy group and p-tolyloxy group, alkoxycarbonyl groups such as methoxycarbonyl group, butoxycarbonyl group, phenoxycarbonyl group, vinyloxycarbonyl group, and aryloxycarbonyl group; Acyloxy groups such as acetoxy group, propionyloxy group, and benzoyloxy group; Acyl groups such as acetyl group, benzoyl group, isobutyryl group, acryloyl group, methacryloyl group, and methoxalyl group; Alkylsulfanyl groups such as methylsulfanyl group and t-butylsulfanyl group; Arylsulfanyl groups such as phenylsulfanyl group and p-tolylsulfanyl group; Alkylamino groups such as methylamino group and cyclohexylamino group; dialkylamino groups such as dimethylamino group, diethylamino group, morpholino group, and piperidino group; Arylamino groups such as phenylamino group and p-tolylamino group; Alkyl groups such as methyl group, ethyl group, t-butyl group, and dodecyl group; Aryl groups such as phenyl group, p-tolyl group, xylyl group, cumenyl group, naphthyl group, anthryl group, and phenanthryl group; Hydroxyl group, carboxyl group, sulfonamide group, formyl group, mercapto group, sulfo group, mesyl group, p-toluenesulfonyl group, amino group, nitro group, nitroso group, cyano group, trifluoromethyl group, trichloromethyl group, trimethylsilyl group, phosphinico group, phosphono group, alkylsulfonyl group, arylsulfonyl group, trialkylammonium group, dimethylsulfonium group, and triphenylphenacylphosphonium group.

The pyridinium cation represented by the formula (III) is preferably an N-substituted pyridinium cation. In this case, R ⁸ is preferably an alkyl group which may have a substituent, and more preferably a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms. The number of carbon atoms is preferably 1 to 16. R ⁹ to R ¹³ are each independently preferably a hydrogen atom, a straight-chain, branched or cyclic alkyl group having 1 to 20 carbon atoms, a hydroxyl group, or a halogen atom, and more preferably a hydrogen atom or a halogen atom having 1 to 20 carbon atoms. It is a linear alkyl group.

Specific examples of inorganic anions that can form an ionic compound (C) include chloride anion [Cl ^- ], bromide anion [Br ^- ], iodide anion [I ^- ], and tetrachloroaluminate anion [AlCl ₄ ^- ], heptachlorodialluminate anion [Al ₂ Cl ₇ ^- ], tetrafluoroborate anion [BF ₄ ^- ], hexafluorophosphate anion [PF ₆ ^- ], perchlorate anion [ClO ₄ ^- ], nitrate anion [ NO ₃ ^- ], hexafluoroacetic anion [AsF ₆ ^- ], hexafluoroantimonate anion [SbF ₆ ^- ], hexafluoroniobate anion [NbF ₆ ^- ], hexafluorotantalate anion [TaF ₆ ^- ], bis(fluorosulfonyl)imide anion [(FSO ₂ ) ₂ N ^- ], (poly)hydrofluorofluoride anion [F(HF) _n ^- ] (n is about 1 to 3), etc. Includes.

Specific examples of organic anions that can form the ionic compound (C) include acetate anion [CH ₃ COO ^- ], trifluoroacetate anion [CF ₃ COO ^- ], and methanesulfonate anion [CH ₃ SO ₃ ^- ]. , trifluoromethanesulfonate anion [CF ₃ SO ₃ ^- ], p-toluenesulfonate anion [p-CH ₃ C ₆ H ₄ SO ₃ ^- ], bis(trifluoromethanesulfonyl)imide anion [( CF ₃ SO ₂ ) ₂ N ^- ], tris (trifluoromethanesulfonyl) methanide anion [(CF ₃ SO ₂ ) ₃ C ^- ], dimethylphosphinate anion [(CH ₃ ) ₂ POO ^- ], thio Cyanide anion [SCN ^- ], perfluorobutanesulfonate anion [C ₄ F ₉ SO ₃ ^- ], bis(pentafluoroethanesulfonyl)imide anion [(C ₂ F ₅ SO ₂ ) ₂ N ^- ], Perfluorobutanoate anion [C ₃ F ₇ COO ^- ], (trifluoromethanesulfonyl)(trifluoromethanecarbonyl)imide anion [(CF ₃ SO ₂ )(CF ₃ CO)N ^- ] , perfluoropropane-1,3-disulfonate anion [ ^-O ₃ S(CF ₂ ) ₃ SO ₃ ^- ], carbonate anion [CO ₃ ^2- ], tetraarylborate anion (such as tetrakis (pentafluoro phenyl) borate anion, etc.), dicyanamide anion [(CN) ₂ N ^- ], and imide anion represented by the following formula (IV).

Among them, anions containing fluorine atoms are preferable because they tend to easily provide an ionic compound (C) with excellent antistatic performance. In particular, the anion is bis(trifluoromethanesulfonyl)imide anion, bis(fluorosulfonyl)imide anion, imide anion represented by the above formula (IV), or tetrakis(pentafluorophenyl)borate. Using an ionic compound (C), which is an anion, is advantageous for improving the antistatic performance, metal corrosion resistance, and optical durability of the optical film 1 with an adhesive layer and the optical laminate.

From the viewpoint of antistatic performance, metal corrosion resistance and optical durability, suitable examples of the ionic compound (C) are as follows.

1) An ionic compound in which the cation is a pyridinium cation represented by the following formula (III), and the anion is any anion selected from the above group.

(In the formula, preferably, R ⁸ is a straight-chain, branched or cyclic alkyl group having 1 to 16 carbon atoms, and R ⁹ to R ¹³ are each independently a hydrogen atom or a straight-chain alkyl group having 1 to 20 carbon atoms. )

2) An ionic compound in which the cation is an inorganic cation such as lithium cation [Li ⁺ ], sodium cation [Na ⁺ ], or potassium cation [K ⁺ ], and the anion is any anion selected from the above group.

The content of the ionic compound (C) in the adhesive composition is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 8 parts by weight, based on 100 parts by weight of the (meth)acrylic resin (A), More preferably, it is 0.3 to 5 parts by weight, and particularly preferably, it is 0.5 to 3 parts by weight. The content of the ionic compound (C) of 0.1 parts by weight or more is advantageous for improving antistatic performance, and the content of 10 parts by weight or less is advantageous for metal corrosion resistance and durability of the optical film (1) with an adhesive layer and the optical laminate. .

[2-4] Isocyanate-based crosslinking agent (D)

The adhesive composition preferably contains an isocyanate-based crosslinking agent (D). By using the isocyanate-based crosslinking agent (D) as a crosslinking agent, the metal corrosion resistance and durability of the optical film 1 with an adhesive layer and the optical laminate can be improved. The isocyanate-based crosslinking agent (D) may be used individually or in combination of two or more types.

The isocyanate-based crosslinking agent (D) is a compound having at least two isocyanato groups (-NCO) in the molecule, and specifically, tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, and hydrogen Added xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, etc. are mentioned. In addition, the isocyanate-based crosslinking agent (D) is a polyhydric alcohol compound adduct form of these isocyanate compounds (for example, an adduct form of glycerol or trimethylolpropane), isocyanurate compound, biuret type compound, and further polyether polyol or polyester. It may be a derivative of a urethane prepolymer type isocyanate compound obtained by addition reaction of polyol, acrylic polyol, polybutadiene polyol, polyisoprene polyol, etc. Among the above, tolylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, or polyhydric alcohol compound adducts of these isocyanate compounds are preferred, and from the viewpoint of durability of the optical film 1 with an adhesive layer and the optical laminate, Xylylene diisocyanate or its polyhydric alcohol compound adduct is more preferable.

The content of the isocyanate-based crosslinking agent (D) is preferably 0.08 to 2.5 parts by weight, more preferably 0.1 to 2 parts by weight (for example, 1 part by weight or less), based on 100 parts by weight of the (meth)acrylic resin (A). am. When the content of the isocyanate-based crosslinking agent (D) is within this range, it is advantageous in terms of both metal corrosion resistance and durability of the optical film 1 with an adhesive layer and the optical laminated body.

The pressure-sensitive adhesive composition can use the isocyanate-based crosslinking agent (D) in combination with other crosslinking agents, such as epoxy compounds, aziridine compounds, metal chelate compounds, peroxides, etc.; however, the optical film with an adhesive layer (1) and the optical lamination From the viewpoint of sieve metal corrosion resistance and durability, it is preferable that the pressure-sensitive adhesive composition contains only an isocyanate-based crosslinking agent (D) as a crosslinking agent, and in particular substantially does not contain peroxide. Here, not substantially included means that the content is 0.01 parts by weight or less based on 100 parts by weight of the (meth)acrylic resin (A).

[2-5] Other ingredients

The adhesive composition may contain one or two or more additives such as solvents, crosslinking catalysts, ultraviolet absorbers, weathering stabilizers, tackifiers, plasticizers, softeners, dyes, pigments, inorganic fillers, and light-scattering fine particles. . In addition, it is also useful to mix an ultraviolet curable compound in an adhesive composition, form an adhesive layer, and then cure it by irradiating ultraviolet rays to obtain a harder adhesive layer. Crosslinking catalysts include, for example, amines such as hexamethylenediamine, ethylenediamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophoronediamine, trimethylenediamine, polyamino resin, and melamine resin. Compounds may be mentioned.

The adhesive composition may contain a rust preventive that can increase the metal corrosion resistance of the optical film 1 with an adhesive layer and the optical laminate. Examples of the rust preventive include triazole-based compounds such as benzotriazole-based compounds and other triazole-based compounds; Thiazole-based compounds such as benzothiazole-based compounds and other thiazole-based compounds; Imidazole-based compounds such as benzylimidazole-based compounds and other imidazole-based compounds; imidazoline-based compounds; Quinoline-based compounds; Pyridine-based compounds; Pyrimidine-based compounds; indole-based compounds; Amine-based compounds; Urea-based compounds; sodium benzoate; Benzylmercapto-based compounds; di-sec-butyl sulfide; and diphenyl sulfoxide.

However, according to the present invention, sufficient metal corrosion resistance can be obtained without containing a rust preventive agent, so it is preferable that the content of the rust preventive agent is as small as possible. In particular, it is preferable that the adhesive composition does not substantially contain a triazole-based compound as a rust preventive agent, and it is more preferable that the adhesive composition does not substantially contain a rust preventive agent selected from the above-described compound group. Here, not substantially included means that the content is 0.01 parts by weight or less based on 100 parts by weight of the (meth)acrylic resin (A).

[3] Metal layer and substrate

The metal layer 30 is, for example, selected from the group consisting of aluminum, copper, silver, gold, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead, and an alloy containing two or more metals selected from these. It may be a layer containing one or more types, and from the viewpoint of conductivity, it is preferably a layer containing a metal element selected from the group consisting of aluminum, copper, silver, and gold, and from the viewpoint of conductivity and cost, it is more preferably It is a layer containing aluminum element, and more preferably, it is a layer containing aluminum element as a main component. Containing as a main component means that the metal component constituting the metal layer 30 is 30% by weight or more, and even 50% by weight or more, of the total metal components.

The metal layer 30 may be, for example, a metal oxide layer such as ITO. However, since the optical film 1 with an adhesive layer according to the present invention has particularly good corrosion resistance to metal elements or alloys, the metal layer 30 has, It is preferable to include a metal element consisting of the above-mentioned metal elements and/or an alloy containing two or more types of the above-described metal elements. However, the optical laminate may have a transparent electrode layer made of a metal oxide such as ITO along with the metal layer 30.

The shape (e.g. thickness, etc.) or preparation method of the metal layer 30 is not particularly limited, and in addition to being a metal foil, it may be formed by vacuum deposition, sputtering, ion plating, inkjet printing, or gravure printing. , Preferably, it is a metal layer formed by sputtering, inkjet printing, or gravure printing, and more preferably, it is a metal layer formed by sputtering. In the metal layer and metal foil formed by sputtering, the former tends to have poorer corrosion resistance, but according to the optical laminate according to the present invention, the metal layer formed by sputtering also has good metal corrosion resistance. The thickness of the metal layer 30 is usually 3 μm or less, preferably 1 μm or less, and more preferably 0.8 μm or less. Additionally, the thickness of the metal layer 30 is usually 0.01 μm or more. In addition, when the metal layer 30 is a metal wiring layer, the line width of the metal wiring of the metal wiring layer is usually 10 μm or less, preferably 5 μm or less, and more preferably 3 μm or less. Additionally, the line width of the metal wiring is usually 0.01 μm or more, preferably 0.1 μm or more, and more preferably 0.5 μm or more. Even for such a thin film metal layer 30 or a metal layer 30 made of thin metal wiring, the optical laminate according to the present invention exhibits good metal corrosion resistance. In particular, even when the metal wiring is, for example, 3 μm or less in thickness and 10 μm or less in line width, or 3 μm or less in thickness and 10 μm or less in line width and formed by the sputtering method, corrosion, especially pitting, can be suppressed.

The metal layer 30 may be, for example, a metal wiring layer (that is, an electrode layer) of a touch input element included in a touch input type liquid crystal display device. In this case, the metal layer 30 is typically patterned into a predetermined shape. When laminating the adhesive layer 20 on the patterned metal layer 30, the adhesive layer 20 may have a portion that is not in contact with the metal layer 30. The metal layer 30 may be a continuous film containing the above metal or alloy.

In addition, the metal layer 30 may have a single-layer structure, or may have a multi-layer structure of two or three or more layers. Examples of the metal layer with a multilayer structure include a metal-containing layer (metal mesh, etc.) with a three-layer structure represented by molybdenum/aluminum/molybdenum.

As shown in FIG. 1, a metal layer 30, for example a metal wiring layer, is usually formed on a substrate 40, and in this case, the optical laminate according to the present invention includes this substrate 40. The metal layer 30 on the substrate 40 can be formed, for example, by sputtering. The substrate 40 may be a transparent substrate constituting a liquid crystal cell included in the touch input device. The substrate 40 is preferably a glass substrate. Examples of materials for the glass substrate include soda-lime glass, low-alkali glass, and alkali-free glass. The metal layer 30 may be formed on the entire surface of the substrate 40 or may be formed on a part of it. When the metal layer 30 is formed on a part of the surface of the substrate 40, such as when the patterned metal layer 30 is formed on the substrate 40, a part of the adhesive layer 20 is made of, for example, glass. It comes into direct contact with the substrate 40, and since the adhesive layer 20 in the optical laminate according to the present invention has excellent adhesion to glass, the optical laminate and the liquid crystal display device provided therewith are Durability in cases such as is also excellent.

[4] Configuration and manufacturing method of optical laminate

In one embodiment, the optical laminate according to the present invention includes an optical film 1 with an adhesive layer and a metal layer 30 laminated on the adhesive layer 20 side, as shown in FIGS. 4 and 5. Includes. In the optical laminates 5 and 6 shown in FIGS. 4 and 5, the optical film 1 with an adhesive layer is placed on the metal layer 30 so that the adhesive layer 20 is in direct contact with the metal layer 30. It is laminated. According to the present invention, even in an optical laminate configured such that the adhesive layer 20 is in direct contact with the metal layer 30, corrosion of the metal layer 30 can be effectively suppressed.

Figure 6 is a schematic cross-sectional view showing another example of the layer structure of an optical laminate according to the present invention. In another embodiment, the optical laminate according to the present invention is, like the optical laminate 7 shown in FIG. 6, the adhesive layer 20 of the optical film 1 with an adhesive layer has a resin layer 50 interposed therebetween. It is laminated on the metal layer 30. The adhesive layer 20 is in direct contact with the resin layer 50. Even in this optical laminate 7, corrosion of the metal layer 30 can be effectively suppressed. The resin layer 50 disposed between the adhesive layer 20 and the metal layer 30 may be, for example, a layer of a cured product of a curable resin. Known curable resins capable of forming the resin layer 50 can be used, and examples thereof include those described in Japanese Patent Application Laid-Open No. 2009-217037.

As described above, the metal layer 30 may be a metal wiring layer. An example in which the metal layer 30 is a metal wiring layer is shown in FIG. 7 . In the optical laminate shown in FIG. 7, the resin layer 50 may be omitted.

The optical laminate includes, for example, an optical film 10 on a metal layer 30 formed on a substrate 40, and an adhesive layer 20 laminated on at least one side thereof. It can be produced by bonding the film 1 through its adhesive layer 20.

As described above, the optical film 1 with an adhesive layer includes an optical film 10 and an adhesive layer 20 laminated on at least one side thereof (FIG. 1). The adhesive layer 20 may be laminated on both sides of the optical film 10. Typically, the adhesive layer 20 is laminated directly on the surface of the optical film 10. When forming the adhesive layer 20 on the surface of the optical film 10, formation of a primer layer on the bonding surface of the optical film 10 and/or the bonding surface of the adhesive layer 20, surface activation treatment, such as plasma It is preferable to perform treatment, corona treatment, etc., and it is more preferable to perform corona treatment.

When the optical film 10 is a single-sided protective polarizing plate as shown in FIG. 2, the adhesive layer 20 is usually on the polarizer side, that is, on the side opposite to the first resin film 3 in the polarizer 2. It is preferably laminated directly on the surface. When the optical film 10 is a double-sided protective polarizing plate as shown in FIG. 3, the adhesive layer 20 may be laminated on the outer surface of either the first or second resin films 3 or 4, and may be applied to both sides. It may be laminated on the outer surface of .

An anti-static layer may be formed separately between the optical film 10 and the adhesive layer 20, but since the adhesive layer 20 of the present invention can provide excellent anti-static properties with the adhesive layer alone, the optical laminate In terms of thinning and simplification of the laminate production process, it is preferable not to have an antistatic layer between the optical film 10 and the adhesive layer 20.

The optical film 1 with an adhesive layer may include a separate film (release film) laminated on the outer surface of the adhesive layer 20. This separate film is usually peeled and removed when the adhesive layer 20 is used (for example, when laminated on the metal layer 30). The separate film may be a film made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyate, and the surface on which the adhesive layer 20 is formed may be subjected to release treatment such as silicone treatment. there is.

The optical film 1 with an adhesive layer is prepared by dissolving or dispersing each component of the adhesive composition in a solvent to form a solvent-containing adhesive composition, which is then applied and dried on the surface of the optical film 10 to form an adhesive. This can be obtained by forming the layer 20. In addition, for the optical film 1 with an adhesive layer, an adhesive layer 20 is formed on the release-treated surface of the separate film in the same manner as above, and this adhesive layer 20 is laminated (transferred) on the surface of the optical film 10. ) can also be obtained by doing.

An optical laminate can be obtained by bonding the optical film 1 with an adhesive layer onto the metal layer 30 (or the resin layer) through the adhesive layer 20. After adhering the optical film 1 with an adhesive layer and the metal layer 30 to produce an optical laminate, if any problems exist, the optical film 1 with an adhesive layer is peeled from the metal layer 30 and separated into separate pieces. A so-called rework operation, in which the optical film 1 with an adhesive layer is reattached to the metal layer 30, may be required. The optical laminate according to the present invention is less likely to cause clouding or adhesive residue on the surface of the metal layer 30 after peeling the optical film 1 with an adhesive layer from the metal layer 30, and has excellent reworkability. . According to the optical laminate according to the present invention, good reworkability can be exhibited even when the surface to which the adhesive layer 20 is bonded is not the metal layer 30 but a glass substrate or an ITO layer.

<Liquid crystal display device>

The liquid crystal display device according to the present invention includes the optical laminate according to the present invention. The liquid crystal display device according to the present invention can suppress corrosion of the metal layer 30 and also exhibits good durability.

The liquid crystal display device according to the present invention is preferably a touch input type liquid crystal display device having a touch panel function. A touch input type liquid crystal display device includes a touch input element including a liquid crystal cell and a backlight. The configuration of the touch panel may be any conventionally known method, such as an out-cell type, an on-cell type, or an in-cell type, and the operation method of the touch panel may be a resistive type, a capacitive type (a surface type capacitance type, a projected capacitance type). ), etc., any conventionally known method may be used. The optical laminate according to the present invention may be placed on the viewing side of the touch input element (liquid crystal cell), may be placed on the backlight side, or may be placed on both sides. The driving method of the liquid crystal cell may be any conventionally known method, such as TN method, VA method, IPS method, multi-domain method, or OCB method. In the liquid crystal display device according to the present invention, the substrate 40 of the optical laminate may be a substrate (typically a glass substrate) included in the liquid crystal cell.

Example

Hereinafter, the present invention will be described in more detail by showing examples and comparative examples, but the present invention is not limited to these examples. Hereinafter, parts and % indicating usage amount and content are based on weight, unless otherwise specified.

<Preparation Example 1: Preparation of (meth)acrylic resin (A-1) for adhesive layer>

A solution obtained by mixing a monomer with the composition shown in Table 1 (the values in Table 1 are parts by weight) with 81.8 parts of ethyl acetate was added to a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer, and a stirrer. After replacing the air in the reaction vessel with nitrogen gas, the internal temperature was set to 60°C. After that, a solution in which 0.12 parts of azobisisobutyronitrile was dissolved in 10 parts of ethyl acetate was added. After maintaining the same temperature for 1 hour, while maintaining the internal temperature at 54 to 56°C, ethyl acetate was continuously added into the reaction vessel at an addition rate of 17.3 parts/Hr so that the polymer concentration was approximately 35%. The internal temperature was maintained at 54 to 56°C until 12 hours had elapsed from the start of addition of ethyl acetate, and then ethyl acetate was added to adjust the polymer concentration to 20%, resulting in (meth)acrylic resin (A-1). An ethyl acetate solution was obtained. The weight average molecular weight (Mw) of the (meth)acrylic resin (A-1) was 1.39 million, and the ratio Mw/Mn of the weight average molecular weight (Mw) and the number average molecular weight (Mn) was 5.32. In the discharge curve of gel permeation chromatography (GPC), the component at Mw 1.39 million showed a single peak, and no other peaks were confirmed in the range of Mw 10 million to 2.5 million.

<Preparation Example 2: Preparation of (meth)acrylic resin (A-2) for adhesive layer>

An ethyl acetate solution of (meth)acrylic resin (A-2) was obtained in the same manner as in Production Example 1 except that the monomer composition was as shown in Table 1 (resin concentration: 20%). The weight average molecular weight (Mw) of (meth)acrylic resin (A-2) was 1.41 million, and Mw/Mn was 4.71. In the GPC emission curve, the component at Mw 1.41 million showed a single peak, and no other peaks were identified in the range of Mw 10 million to 2.5 million.

In the above production example, the weight average molecular weight (Mw) and the number average molecular weight (Mn) were calculated using four columns of "TSKgel XL" manufactured by Tosoh Corporation and "TSKgel XL" manufactured by Showa Denko Co., Ltd. as columns in the GPC apparatus. A total of 5 pieces of “Shodex GPC KF-802” were connected in series and placed, using tetrahydrofuran as an eluent, sample concentration was 5 mg/ml, sample introduction amount was 100 μl, temperature was 40°C, and flow rate was 1 ml/min. Under these conditions, it was measured by standard polystyrene conversion. The conditions for obtaining the GPC emission curve were also the same.

The glass transition temperature (Tg) was measured under a nitrogen atmosphere using a differential scanning calorimeter (DSC) “EXSTAR DSC6000” manufactured by SI Nanotechnology Co., Ltd., with a temperature range of -80 to 50°C and a temperature increase rate of 10°C/min. Measured under conditions.

The composition of the monomer in each production example (the values in Table 1 are in parts by weight) and the number of peaks in the range of Mw 10 to 2.5 million on the GPC discharge curve (indicated as “number of GPC peaks” in Table 1) are shown in Table 1. It is summarized in .

Abbreviated names in the “Monomer Composition” column of Table 1 mean the following monomers.

BA: Butylacrylate (glass transition temperature of homopolymer: -54°C),

MA: methyl acrylate (glass transition temperature of homopolymer: 10°C),

HEA: 2-hydroxyethyl acrylate.

<Examples 1 to 8, Comparative Examples 1 to 7>

(1) Preparation of adhesive composition

To the ethyl acetate solution (resin concentration: 20%) of the (meth)acrylic resin obtained in the above production example, the silane compound (B), ionic compound (C) and isocyanate shown in Table 2 are added to 100 parts of solid content of the solution. The system crosslinking agent (D) was mixed in the amounts (parts by weight) shown in Table 2, and ethyl acetate was added so that the solid content concentration was 14% to obtain an adhesive composition. The mixing amount of each compounding ingredient shown in Table 2 is the number of parts by weight as the active ingredient contained therein when the product used contains a solvent or the like.

The details of each compounding component indicated by abbreviation in Table 2 are as follows.

(Silane compound)

B-1: A silane compound represented by the formula below,

B-2: A silane compound represented by the formula below,

B-3: 3-Glycidoxypropyltrimethoxysilane, brand name “KBM403” obtained from Shin-Etsu Chemical Co., Ltd.

(ionic compound)

C-1: Ionic compound represented by the formula below,

C-2: Ionic compound represented by the formula below,

C-3: lithium bis(trifluoromethanesulfonyl)imide,

C-4: Potassium bis(fluorosulfonyl)imide,

C-5: N-decylpyridinium bis(fluorosulfonyl)imide,

C-6: N-methylpyridinium tetrakis(pentafluorophenyl)borate,

C-7: N-decylpyridinium tetrakis(pentafluorophenyl)borate,

(Isocyanate-based crosslinking agent)

D-1: Ethyl acetate solution (solid content concentration 75%) of trimethylolpropane adduct of xylylene diisocyanate, brand name “Takenate D-110N” obtained from Mitsui Chemicals Co., Ltd.

(2) Production of adhesive layer

Each adhesive composition prepared in (1) above was dried using an applicator on the release-treated side of a separate film made of polyethylene terephthalate film (brand name "PLR-382051" obtained from Lintech Co., Ltd.) that had been subjected to release treatment. It was applied to a thickness of 20 ㎛ and dried at 100°C for 1 minute to produce an adhesive layer (adhesive sheet).

(3) Production of optical film (P-1) with adhesive layer

A polyvinyl alcohol film (trade name “Kurare Vinylon VF-PE#6000” manufactured by Kuraray Co., Ltd.) with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol%, and a thickness of 60 μm was immersed in pure water at 37°C. It was immersed in an aqueous solution containing iodine and potassium iodide (iodine/potassium iodide/water (weight ratio) = 0.04/1.5/100) at 30°C. After that, it was immersed in an aqueous solution containing potassium iodide and boric acid (potassium iodide/boric acid/water (weight ratio) = 12/3.6/100) at 56.5°C. After washing the film with pure water at 10°C, it was dried at 85°C to obtain a polarizer with a thickness of about 23 μm in which iodine was adsorbed and oriented on polyvinyl alcohol. Stretching was mainly performed in the steps of iodine dyeing and boric acid treatment, and the total stretching ratio was 5.3 times.

A transparent protective film made of a triacetylcellulose film with a thickness of 25 μm (trade name “KC2UA” manufactured by Konica Minolta Opto Co., Ltd.) was bonded to one side of the obtained polarizer through an adhesive made of an aqueous solution of polyvinyl alcohol-based resin. Next, on the side of the polarizer opposite to the triacetylcellulose film, a 23 µm thick zero retardation film made of cyclic polyolefin resin (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) was placed on a polyvinyl alcohol-based film. A polarizing plate was manufactured by bonding using an adhesive made of an aqueous resin solution. Subsequently, after corona discharge treatment to improve adhesion is performed on the surface of the zero retardation film opposite to the surface in contact with the polarizer, the surface opposite to the separate film of the adhesive layer produced in (2) above (adhesive After the layers were bonded together using a laminator, they were cured for 7 days at a temperature of 23°C and a relative humidity of 65% to obtain an optical film (P-1) with an adhesive layer.

(4) Production of optical film (P-2) with adhesive layer

A polyvinyl alcohol film (trade name “Kurare Vinylon VF-PE#3000” manufactured by Kuraray Co., Ltd.) with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol%, and a thickness of 30 μm was immersed in pure water at 37°C. It was immersed in an aqueous solution containing iodine and potassium iodide (iodine/potassium iodide/water (weight ratio) = 0.04/1.5/100) at 30°C. After that, it was immersed in an aqueous solution containing potassium iodide and boric acid (potassium iodide/boric acid/water (weight ratio) = 12/3.6/100) at 56.5°C. After washing the film with pure water at 10°C, it was dried at 85°C to obtain a polarizer with a thickness of about 12 μm in which iodine was adsorbed and oriented on polyvinyl alcohol. Stretching was mainly carried out in the steps of iodine dyeing and boric acid treatment, and the total stretching ratio was 5.3 times.

A transparent protective film made of a triacetylcellulose film with a thickness of 25 μm (trade name “KC2UA” manufactured by Konica Minolta Opto Co., Ltd.) is bonded to one side of the obtained polarizer through an adhesive made of an aqueous solution of polyvinyl alcohol-based resin to form a polarizing plate. was produced. Subsequently, the side opposite to the separate film of the adhesive layer produced in (2) above is bonded to the side opposite to the side to which the protective film of the polarizer is bonded (adhesive layer side) using a laminator, and then bonded at a temperature of 23°C. , cured for 7 days under conditions of 65% relative humidity, and obtained an optical film with an adhesive layer (P-2).

(5) Evaluation of metal corrosion resistance of optical films with adhesive layer

The optical film (P-1) with an adhesive layer produced in (3) above was cut into a test piece of 20 mm x 50 mm in size and adhered to the metal layer side of a glass substrate with a metal layer through the adhesive layer. For the glass substrate with a metal layer, a glass substrate (manufactured by Geomatech Co., Ltd.) in which a metal aluminum layer with a thickness of approximately 500 nm was laminated on the surface of an alkali-free glass by sputtering was used. After the obtained optical laminate was stored in an oven at a temperature of 60°C and a relative humidity of 90% for 500 hours, the state of the metal layer in the area where the optical film with an adhesive layer was adhered was examined through a magnifying glass ( It was observed through a loupe, and pitting (occurrence of holes with a diameter of 0.1 mm or more and capable of transmitting light) was evaluated based on the following criteria. The results are shown in Table 3.

5: No pitting or white turbidity is visible on the metal layer surface.

4: The number of formulas generated on the surface of the metal layer is 2 or less,

3: The number of formulas occurring on the surface of the metal layer is 3 to 5,

2: The number of formulas occurring on the surface of the metal layer is 6 or more,

1: Many pitting pits are generated on the entire surface of the metal layer, and white turbidity is also generated.

(6) Durability evaluation of optical film with adhesive layer

The optical film (P-1) with an adhesive layer prepared in (3) above was cut into a size of 200 mm was joined to. The obtained test piece to which the glass substrate was adhered (optical film with an adhesive layer to which the glass substrate was adhered) was pressurized in an autoclave at a temperature of 50°C and a pressure of 5 kg/cm2 (490.3 kPa) for 20 minutes. For the glass substrate, alkali-free glass brand name "Eagle XG" manufactured by Corning Corporation was used. The following three types of durability tests were performed on the obtained optical laminate.

[Durability Test]

·Heat resistance test maintained for 750 hours under dry conditions at a temperature of 85℃,

· Moisture and heat resistance test maintained for 750 hours in an environment with a temperature of 60°C and a relative humidity of 90%,

· Heat shock resistance (HS) test in which the operation of holding for 30 minutes under dry conditions at a temperature of 85°C and then holding for 30 minutes under dry conditions at a temperature of -40°C is considered one cycle, and this is repeated for 400 cycles.

The optical laminate after each test was visually observed, the presence or absence of changes in appearance such as lifting, peeling, and foaming of the adhesive layer was visually observed, and durability was evaluated according to the following evaluation criteria. The results are shown in Table 3.

4: No changes in appearance such as lifting, peeling, foaming, etc. are observed.

3: Almost no changes in appearance such as lifting, peeling, foaming, etc.,

2: Slightly noticeable changes in appearance such as lifting, peeling, foaming, etc.

1: Significant changes in appearance such as lifting, peeling, and foaming were observed.

(7) Evaluation of reworkability of optical film with adhesive layer

The optical film with an adhesive layer (P-1) produced in (3) above was cut into test pieces of 25 mm x 150 mm in size. The separator was peeled from the test piece, and the adhesive side was adhered to the glass substrate. The obtained test piece to which the glass substrate was adhered (optical film with an adhesive layer to which the glass substrate was adhered) was pressurized in an autoclave at a temperature of 50°C and a pressure of 5 kg/cm2 (490.3 kPa) for 20 minutes. Next, it was stored in an oven at 50°C for 48 hours, and the optical film was peeled from the test piece along with the adhesive layer in a 180° direction at a speed of 300 mm/min in an atmosphere of 23°C and 50% relative humidity. The state of the glass substrate surface after peeling was observed and evaluated based on the following criteria. The results are shown in Table 3.

4: No blurring was observed on the surface of the glass substrate,

3: Little blurring is observed on the surface of the glass substrate,

2: Cloudiness, etc. was confirmed on the surface of the glass substrate,

1: Residue of the adhesive layer was confirmed on the surface of the glass substrate.

(8) Evaluation of discoloration of optical films with adhesive layer

The optical film (P-2) with an adhesive layer produced in (4) above was cut into a size of 30 mm x 30 mm, the separate film was peeled off, and the exposed adhesive layer surface was bonded to a glass substrate. For the glass substrate, alkali-free glass brand name "Eagle XG" manufactured by Corning Corporation was used. For the obtained optical laminate, the MD transmittance and TD transmittance in the wavelength range of 380 to 780 nm were measured using a spectrophotometer equipped with an integrating sphere (product name “V7100” manufactured by Nippon Bunko Co., Ltd.), and the MD transmittance and TD transmittance were measured at each wavelength. Calculate the single transmittance and degree of polarization _, and perform visibility correction using a 2- _degree field of view (C light source) according to JIS Z 8701: 1999 "Color display method - _XYZ colorimetric system and The previous visibility-corrected single transmittance (Ty) and visibility-corrected polarization (Py) were obtained. Additionally, the optical laminate was set in a spectrophotometer equipped with an integrating sphere so that the triacetylcellulose film side of the polarizing plate was used as the detector side, and light entered from the glass substrate side.

The single transmittance and polarization degree are each defined by the following formula.

Single transmittance (λ)=0.5×(Tp(λ)+Tc(λ))

Polarization degree (λ)=100×(Tp(λ)-Tc(λ))/(Tp(λ)+Tc(λ))

Tp(λ) is the transmittance (%) of the optical laminate measured in the relationship between the linearly polarized light of the incident wavelength λ (nm) and the parallel Nicol, and Tc(λ) is the linearly polarized light of the incident wavelength λ (nm). This is the transmittance (%) of the optical laminate measured in the relationship between and orthogonal Nicols.

Subsequently, this optical laminate was placed in a moist heat environment with a temperature of 80°C and a relative humidity of 90% for 24 hours, and then placed in an environment with a temperature of 23°C and a relative humidity of 60% for an additional 24 hours, and then subjected to a durability test using the same method as before the durability test. The subsequent Ty and Py were obtained. After that, Py and Ty before the test were subtracted from Py and Ty after the test, respectively, to calculate the amount of change before and after the durability test, and the amount of change in polarization degree (ΔPy) and the amount of change in single transmittance (ΔTy) were obtained. ΔPy is shown in Table 3.

<Preparation Example 3: Preparation of (meth)acrylic resin (A-1) for adhesive layer>

A solution obtained by mixing a monomer with the composition shown in Table 4 (the values in Table 4 are parts by weight) with 81.8 parts of ethyl acetate was added to a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer, and a stirrer. After replacing the air in the reaction vessel with nitrogen gas, the internal temperature was set to 60°C. After that, a solution in which 0.12 parts of azobisisobutyronitrile was dissolved in 10 parts of ethyl acetate was added. After maintaining the same temperature for 1 hour, while maintaining the internal temperature at 54 to 56°C, ethyl acetate was continuously added into the reaction vessel at an addition rate of 17.3 parts/Hr so that the polymer concentration was approximately 35%. The internal temperature was maintained at 54 to 56°C until 12 hours had elapsed from the start of addition of ethyl acetate, and then ethyl acetate was added to adjust the polymer concentration to 20% to produce (meth)acrylic resin (A-1). An ethyl acetate solution was obtained. The weight average molecular weight (Mw) of the (meth)acrylic resin (A-1) was 1.39 million, and the ratio Mw/Mn of the weight average molecular weight (Mw) and the number average molecular weight (Mn) was 5.32. In the discharge curve of gel permeation chromatography (GPC), the component at Mw 1.39 million showed a single peak, and no other peaks were confirmed in the range of Mw 10 million to 2.5 million.

In the above production example, the weight average molecular weight (Mw) and the number average molecular weight (Mn) were calculated using four columns of "TSKgel XL" manufactured by Tosoh Corporation and "TSKgel XL" manufactured by Showa Denko Co., Ltd. as columns in the GPC apparatus. A total of 5 pieces of “Shodex GPC KF-802” were connected in series and placed, using tetrahydrofuran as an eluent, sample concentration was 5 mg/ml, sample introduction amount was 100 μl, temperature was 40°C, and flow rate was 1 ml/min. Under these conditions, it was measured by standard polystyrene conversion. The conditions for obtaining the GPC emission curve were also the same.

The glass transition temperature (Tg) was measured under a nitrogen atmosphere using a differential scanning calorimeter (DSC) “EXSTAR DSC6000” manufactured by SI Nanotechnology Co., Ltd., with a temperature range of -80 to 50°C and a temperature increase rate of 10°C/min. Measured under conditions.

The composition of the monomer in Preparation Example 3 (the values in Table 4 are in parts by weight), and the number of peaks in the range of Mw 10 million to 2.5 million on the GPC discharge curve (indicated as “number of GPC peaks” in Table 4) are listed in Table 4. It is summarized in 4.

Abbreviated names in the “Monomer Composition” column of Table 4 refer to the following monomers.

BA: Butylacrylate (glass transition temperature of homopolymer: -54°C),

MA: methyl acrylate (glass transition temperature of homopolymer: 10°C),

HEA: 2-hydroxyethyl acrylate,

<Example 9, Comparative Example 8>

(1) Preparation of adhesive composition

To the ethyl acetate solution (resin concentration: 20%) of the (meth)acrylic resin obtained in the above production example, the silane compound (B), ionic compound (C) and isocyanate shown in Table 5 are added to 100 parts of solid content of the solution. The system crosslinking agent (D) was mixed in the amounts (parts by weight) shown in Table 5, and ethyl acetate was added so that the solid content concentration was 14% to obtain an adhesive composition. The mixing amount of each compounding ingredient shown in Table 5 is the weight number of active ingredients contained therein when the product used contains a solvent or the like.

The details of each compounding component indicated by abbreviated names in Table 5 are as follows.

(Silane compound)

B-1: A silane compound represented by the formula below,

B-3: 3-Glycidoxypropyltrimethoxysilane, brand name “KBM403” obtained from Shin-Etsu Chemical Co., Ltd.

(ionic compound)

C-5: N-decylpyridinium bis(fluorosulfonyl)imide.

(Isocyanate-based crosslinking agent)

D-1: Ethyl acetate solution (solid content concentration 75%) of trimethylolpropane adduct of xylylene diisocyanate, brand name “Takenate D-110N” obtained from Mitsui Chemicals Co., Ltd.

(2) Production of adhesive layer

Each adhesive composition prepared in (1) above was dried using an applicator on the release-treated side of a separate film made of polyethylene terephthalate film (brand name "PLR-382051" obtained from Lintech Co., Ltd.) that had been subjected to release treatment. It was applied to a thickness of 20 ㎛ and dried at 100°C for 1 minute to produce an adhesive layer (adhesive sheet).

(3) Production of optical film (P-1) with adhesive layer

A polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol%, and a thickness of 60 μm (trade name “Kurare Vinylon VF-PE#6000” manufactured by Kuraray Co., Ltd.) was immersed in pure water at 37°C. It was immersed in an aqueous solution containing iodine and potassium iodide (iodine/potassium iodide/water (weight ratio) = 0.04/1.5/100) at 30°C. After that, it was immersed in an aqueous solution containing potassium iodide and boric acid (potassium iodide/boric acid/water (weight ratio) = 12/3.6/100) at 56.5°C. After washing the film with pure water at 10°C, it was dried at 85°C to obtain a polarizer with a thickness of about 23 μm in which iodine was adsorbed and oriented on polyvinyl alcohol. Stretching was mainly carried out in the steps of iodine dyeing and boric acid treatment, and the total stretching ratio was 5.3 times.

A transparent protective film made of a triacetylcellulose film with a thickness of 25 μm (trade name “KC2UA” manufactured by Konica Minolta Opto Co., Ltd.) was bonded to one side of the obtained polarizer through an adhesive made of an aqueous solution of polyvinyl alcohol-based resin. Next, on the side of the polarizer opposite to the triacetylcellulose film, a 23 ㎛ thick zero retardation film made of cyclic polyolefin resin (trade name "ZEONOR" manufactured by Nippon Zeon Co., Ltd.) was placed on a polyvinyl alcohol resin. A polarizing plate was produced by bonding using an adhesive made of an aqueous solution. Subsequently, after corona discharge treatment to improve adhesion is performed on the side of the zero retardation film opposite to the side in contact with the polarizer, the side opposite to the separate film of the adhesive layer produced in (2) above (adhesive layer side) ) was bonded using a laminator, and then cured for 7 days under conditions of a temperature of 23°C and a relative humidity of 65% to obtain an optical film (P-1) with an adhesive layer.

(4) Evaluation of metal corrosion resistance of optical films with adhesive layer

The optical film (P-1) with an adhesive layer produced in (3) above was cut into a test piece of 20 mm x 50 mm in size and adhered to the metal layer side of a glass substrate with a metal layer through the adhesive layer. The glass substrate with a metal layer is a glass substrate (manufactured by Geomatech Co., Ltd.) in which a layer of silver alloy (an alloy containing silver as a main component, palladium and copper, APC) with a thickness of approximately 500 nm is laminated on the surface of an alkali-free glass by sputtering. was used. After the obtained optical laminate was stored in an oven at a temperature of 60°C and a relative humidity of 90% for 500 hours, the state of the metal layer in the area where the optical film with an adhesive layer was adhered was examined by exposing light from the back of the glass substrate and using a magnifying glass from the surface of the polarizer. Through observation, pitting (occurrence of holes with a diameter of 0.1 mm or more and capable of transmitting light) was evaluated based on the following criteria. The results are shown in Table 6.

5: No pitting or white turbidity is visible on the metal layer surface.

4: The number of formulas generated on the surface of the metal layer is 2 or less,

3: The number of formulas occurring on the surface of the metal layer is 3 to 5,

2: The number of formulas occurring on the surface of the metal layer is 6 or more,

1: Many pitting pits are generated on the entire surface of the metal layer, and white turbidity is also generated.

1: Optical film with adhesive layer, 2: Polarizer, 3: First resin film, 4: Second resin film, 5, 6, 7: Optical laminate, 10: Optical film, 10a, 10b: Polarizer, 20: Adhesive Layer, 30: metal layer, 40: substrate, 50: resin layer.

Claims (21)

It includes an optical film, an adhesive layer, and a metal layer in this order,
The adhesive layer is composed of an adhesive composition containing a (meth)acrylic resin (A), a silane compound (B), and an ionic compound (C),
An optical laminate wherein the silane compound (B) is a silane compound represented by the following formula (I).

(Wherein, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH ₂ - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or - It may be substituted with C(=O)-, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a carbon number Indicates alkoxy groups of 1 to 5.) The method of claim 1, wherein the metal layer is selected from the group consisting of aluminum, copper, silver, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead, and an alloy containing two or more metals selected from these. An optical laminate comprising one or more types. The optical laminate according to claim 1, wherein the metal layer contains aluminum element. The optical laminate according to claim 1, wherein the metal layer is a layer formed by sputtering. The optical laminate according to claim 1, wherein the metal layer has a thickness of 3 μm or less. The optical laminate according to claim 1, wherein the metal layer is a metal wiring layer. The optical laminate according to claim 6, wherein the line width of the metal wiring in the metal wiring layer is 10 μm or less. The optical laminate according to claim 1, wherein the silane compound (B) represented by the formula (I) is a silane compound represented by the following formula (II).

(In the formula, R ¹ , R ³ , R ⁴ , R ⁵ and R ⁶ each have the same meaning as above, R ⁷ represents an alkyl group having 1 to 5 carbon atoms, and m represents an integer of 1 to 20.) The optical laminate according to claim 8, wherein m in the formula (II) is an integer of 4 to 20. The optical laminate according to claim 8, wherein m in the formula (II) is an integer of 6 to 8. The optical laminate according to claim 8, wherein m in the formula (II) is 6. The optical laminate according to claim 1, wherein the silane compound (B) is 1,6-bis(trimethoxysilyl)hexane. The optical laminate according to claim 1, wherein the content of the silane compound (B) in the adhesive composition is 0.01 to 10 parts by weight based on 100 parts by weight of the (meth)acrylic resin (A). The optical laminate according to claim 1, wherein the (meth)acrylic resin (A) contains a structural unit derived from a monomer having a hydroxyl group. The method of claim 1, wherein the (meth)acrylic resin (A) comprises a structural unit derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0°C and an alkyl acrylic unit having a homopolymer glass transition temperature of 0°C or more. An optical laminate containing a structural unit derived from rate (a2). The optical laminate according to claim 1, wherein the (meth)acrylic resin (A) has a weight average molecular weight of 500,000 to 2.5 million. The optical laminate according to claim 1, wherein the pressure-sensitive adhesive composition further includes an isocyanate-based crosslinking agent (D). The optical laminate according to claim 1, wherein the pressure-sensitive adhesive composition substantially does not contain a triazole-based compound. A liquid crystal display device comprising the optical laminate according to any one of claims 1 to 18. Contains (meth)acrylic resin (A), silane compound (B), and ionic compound (C),
The silane compound (B) is a silane compound represented by the following formula (I),
An adhesive composition used to form an adhesive layer laminated on a metal layer.

(Wherein, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH ₂ - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or - It may be substituted with C(=O)-, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a carbon number Indicates alkoxy groups of 1 to 5.) An optical film with an adhesive layer comprising an optical film and an adhesive layer laminated on at least one side of the optical film, and for bonding to a metal layer through the adhesive layer,
The adhesive layer is,
Contains (meth)acrylic resin (A), silane compound (B), and ionic compound (C),
The silane compound (B) is a silane compound represented by the following formula (I),
An optical film with an adhesive layer formed from an adhesive composition.

(Wherein, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH ₂ - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or - It may be substituted with C(=O)-, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a carbon number Indicates alkoxy groups of 1 to 5.)

Images