JP6668147B2 - Optical laminate and liquid crystal display device - Google Patents

Description

  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.

  2. Description of the Related Art An optical film represented by a polarizing plate obtained by laminating and bonding a transparent resin film on 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 being bonded to another member (for example, a liquid crystal cell in a liquid crystal display device) via an adhesive layer [for example, Japanese Patent Application Laid-Open No. 2010-229321 (Patent) Reference 1)]. For this reason, as an optical film, an optical film with an adhesive layer in which an adhesive layer is provided in advance on one surface thereof is known. Further, there is also known an adhesive layer containing an ionic compound in order to impart antistatic properties.

JP 2010-229321 A

  In recent years, liquid crystal display devices have been developed for use in mobile devices having a touch panel function represented by smartphones, tablet terminals, and car navigation systems for vehicles. In such a touch input type liquid crystal display device, the optical film with an adhesive layer is disposed such that the adhesive layer is in direct contact with, for example, a resin layer or a metal layer formed of metal wiring. Sometimes. However, in a configuration in which a metal layer made of a metal material and a pressure-sensitive adhesive layer containing an ionic compound are combined, the metal layer may corrode under a high-temperature and high-humidity environment. Among corrosion, pitting corrosion is particularly problematic when the thickness of the metal layer is small or when the metal layer is a metal wiring and the line width is narrow, since the metal layer penetrates.

  The present invention is 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 includes an optical laminate capable of suppressing corrosion of the metal layer, and It is intended to provide a liquid crystal display device.

  The present invention provides the following optical laminate, a liquid crystal display device including the same, and a pressure-sensitive adhesive composition.

[1] including an optical film, an adhesive layer, and a metal layer in this order;
The pressure-sensitive adhesive layer is composed of a pressure-sensitive adhesive composition containing a (meth) acrylic resin (A), a silane compound (B), and an ionic compound (C),
The silane compound (B) has 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 constitutes the alkanediyl group and the alicyclic hydrocarbon group. CH ₂ — may be replaced by —O— or —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 each independently represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms.)
The optical laminated body which is a silane compound represented by these.

  [2] 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. The optical laminate according to [1], comprising at least one type.

  [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 silane compound (B) represented by the formula (I) is represented by the following formula (II):

(Wherein, 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) Represents.)
The optical laminate according to any one of [1] to [5], which is a silane compound represented by the following formula:

[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 pressure-sensitive 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 any one of [10].

  [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) has a homopolymer having a glass transition temperature of less than 0 ° C, a structural unit derived from an alkyl acrylate (a1), and a homopolymer having a glass transition temperature of 0 ° C or higher. The optical laminate according to any one of [1] to [12], containing a structural unit derived from the alkyl acrylate (a2).

  [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 pressure-sensitive adhesive composition further includes an isocyanate-based crosslinking agent (D).

  [16] The optical laminate according to any one of [1] to [15], wherein the pressure-sensitive adhesive composition contains substantially no triazole-based compound.

[17] A liquid crystal display device comprising the optical laminate according to any one of [1] to [16].
[18] including a (meth) acrylic resin (A), a silane compound (B), and an ionic compound (C),
The silane compound (B) has 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 constitutes the alkanediyl group and the alicyclic hydrocarbon group. CH ₂ — may be replaced by —O— or —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 each independently represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms.)
Is a silane compound represented by
An adhesive composition used for forming an adhesive layer laminated on a metal layer.

  ADVANTAGE OF THE INVENTION According to this invention, the optical laminated body which can suppress the corrosion of a metal layer, and a liquid crystal display device containing the same can be provided.

FIG. 1 is a schematic cross-sectional view illustrating an example of an optical laminate according to the present invention. FIG. 3 is a schematic sectional view illustrating an example of a layer configuration of a polarizing plate. It is a schematic sectional drawing which shows another example of the layer structure of a polarizing plate. FIG. 3 is a schematic cross-sectional view illustrating an example of a layer configuration of the optical laminate. It is a schematic sectional drawing which shows another example of the layer structure of an optical laminated body. It is a schematic sectional drawing which shows another example of the layer structure of an optical laminated body. It is a schematic sectional drawing which shows another example of the layer structure of an optical laminated body.

<Optical laminate>
FIG. 1 is a schematic sectional view showing an example of the 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 may further include a substrate 40. This optical laminate includes an optical film with an adhesive layer 1 including an optical film 10 and an adhesive layer 20 laminated on at least one surface of a metal layer 30 formed on a substrate 40. It can be bonded through the pressure-sensitive adhesive layer 20.

  The pressure-sensitive adhesive layer 20 is usually directly laminated on the surface of the optical film 10. Further, the optical film with an adhesive layer 1 is usually 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, in such an optical laminated body, corrosion of the metal layer 30 can be effectively suppressed. Hereinafter, the property capable of suppressing the corrosion of the metal layer 30 is also referred to as “metal corrosion resistance”.

  The optical film 10 may be a single-layer optical film or a multilayer optical film. The pressure-sensitive adhesive layer 20 includes a (meth) acrylic resin (A), a silane compound (B), and an ionic compound (C), and preferably includes a pressure-sensitive adhesive composition further including an isocyanate-based crosslinking agent (D). Is done. This pressure-sensitive adhesive composition may further contain other components. In the present specification, “(meth) acryl” means at least one selected from the group consisting of acryl and methacryl. The same applies to “(meth) acrylate” and “(meth) acryloyl”.

[1] Optical Film The optical film 10 included in 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 that can be incorporated into an image display device such as a liquid crystal display device. (A film having optical properties). The optical film 10 may be a single-layer optical film or a multilayer optical film. Specific examples of the optical film having a single-layer structure include, besides a polarizer, an optical functional film such as a retardation film, a brightness enhancement film, an antiglare film, an antireflection film, a diffusion film, and a condensing film. Specific examples of the optical film having a multilayer structure include a polarizing plate and a retardation plate. In this specification, a polarizing plate refers to a polarizer in which a resin film or a resin layer is laminated on at least one surface of a polarizer. The retardation plate refers to a retardation film in which a resin film or a resin layer is laminated on at least one surface. The optical film 10 is preferably a polarizing plate, a polarizer, a retardation plate or a retardation film, and more preferably a polarizing plate or a polarizer.

[1-1] Polarizing Plate FIGS. 2 and 3 are schematic cross-sectional views showing examples of the layer configuration of the polarizing plate. The polarizing plate 10a shown in FIG. 2 is a single-sided protective polarizing plate in which the first resin film 3 is laminated on one surface of the polarizer 2, and the polarizing plate 10b shown in FIG. This is a double-sided protective polarizing plate in which the second resin film 4 is further laminated and bonded to the other surface. The first and second resin films 3 and 4 can be bonded to the polarizer 2 via an unillustrated adhesive layer or pressure-sensitive adhesive layer. The polarizing plates 10a and 10b may include other films and layers other than the first and second resin films 3 and 4.

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

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

  The polyvinyl alcohol-based resin can be obtained by saponifying a polyvinyl acetate-based resin. Examples of the polyvinyl acetate resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and a copolymer of a monomer copolymerizable with vinyl acetate and vinyl acetate. Examples of monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides 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, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The average degree of polymerization of the polyvinyl alcohol-based resin is generally from 1,000 to 10,000, preferably from 1,500 to 5,000. The average degree of polymerization of the polyvinyl alcohol-based resin can be determined in accordance with JIS K 6726.

  Usually, a film formed of a polyvinyl alcohol-based resin is used as a raw film of the polarizer 2. The 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 preferably 10 μm or more in consideration of ease of stretching.

  The polarizer 2 is, for example, a step of uniaxially stretching the raw film, a step of dyeing the film with a dichroic dye and adsorbing the dichroic dye, a step of treating the film with a boric acid aqueous solution, and The film is washed with water, and finally dried and manufactured. The thickness of the polarizer 2 is usually 1 to 30 μm, and preferably 20 μm or less, more preferably 15 μm or less, and still more preferably 10 μm or less, from the viewpoint of reducing the thickness of the optical film 1 with an adhesive layer.

  The polarizer 2 obtained by adsorbing and orienting a dichroic dye on a polyvinyl alcohol-based resin film is: 1) A single film of a polyvinyl alcohol-based resin film is used as a raw film, and the film is subjected to uniaxial stretching treatment and dichroism. In addition to the method of dyeing the pigment, 2) a coating liquid (such as an aqueous solution) containing a polyvinyl alcohol-based resin was applied to the base film and dried to obtain a base film having a polyvinyl alcohol-based resin layer. Thereafter, it can also be obtained by a method of uniaxially stretching the whole substrate film, applying a dichroic dye treatment to the stretched polyvinyl alcohol-based resin layer, and then peeling and removing the substrate film. As the base film, a film made of a thermoplastic resin similar to the thermoplastic resin that can form the first and second resin films 3 and 4 described later can be used, and a polyester resin such as polyethylene terephthalate is preferable. And a cellulose resin such as polycarbonate resin and triacetyl cellulose, a cyclic polyolefin resin such as norbornene resin, and a polystyrene resin. According to the method 2), the thin film polarizer 2 can be easily manufactured, and for example, the thin film polarizer 2 having a thickness of 7 μm or less can be easily manufactured.

  Each of the first and second resin films 3 and 4 is independently a light-transmitting, preferably optically transparent thermoplastic resin, for example, a linear polyolefin resin (polyethylene resin, polypropylene resin, or the like). Polyolefin resins such as cyclic polyolefin resins (norbornene resins, etc.); cellulose resins (cellulose ester resins, etc.); polyester resins (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, etc.); polycarbonate resins; (Meth) acrylic resin; polystyrene resin; polyetheretherketone resin; polysulfone resin, or a film made of 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 a cyclic polyolefin resin, a polycarbonate resin, a cellulose resin, a polyester resin, and a (meth) acrylic resin. It is more preferable that the resin is selected from the group consisting of cellulose resins and cyclic polyolefin resins.

  Examples of the chain polyolefin resin include a homopolymer of a chain olefin such as a polyethylene resin and a polypropylene resin, and a copolymer composed of two or more chain olefins.

  The cyclic polyolefin-based resin is a general term for resins containing as a polymerization unit a cyclic olefin represented by norbornene, tetracyclododecene (also called dimethanooctahydronaphthalene) or a derivative thereof. Specific examples of the cyclic polyolefin resin include a ring-opening (co) polymer of a cyclic olefin and a hydrogenated product thereof, an addition polymer of a cyclic olefin, a cyclic olefin and a chain olefin such as ethylene or propylene, or a vinyl group. And a modified (co) polymer obtained by modifying these with an unsaturated carboxylic acid or a derivative thereof. Among them, a norbornene-based resin using a norbornene-based monomer such as norbornene or a polycyclic norbornene-based monomer as the cyclic olefin is preferably used.

  The cellulose-based resin is preferably a cellulose ester-based resin, that is, a partially or completely esterified product of cellulose, for example, cellulose acetate, propionate, butyrate, and a mixed ester thereof. Among them, triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose acetate butyrate and the like are preferably used.

  The polyester resin is a resin having an ester bond other than the above cellulose ester resin, and generally comprises a polycondensate of a polyhydric carboxylic acid or a derivative thereof and a polyhydric alcohol. Specific examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexane dimethyl terephthalate, and polycyclohexane dimethyl naphthalate.

  The polycarbonate resin is a polyester formed from carbonic acid and glycol or bisphenol. Among them, aromatic polycarbonates having diphenylalkane in the molecular chain are preferably used from the viewpoint of heat resistance, weather resistance and acid resistance. As polycarbonate, 2,2-bis (4-hydroxyphenyl) propane (also known as bisphenol A), 2,2-bis (4-hydroxyphenyl) butane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1 Examples are polycarbonates derived from bisphenols such as -bis (4-hydroxyphenyl) isobutane, 1,1-bis (4-hydroxyphenyl) ethane.

The (meth) acrylic resin that can constitute the first and second resin films 3 and 4 can be a polymer mainly composed of structural units derived from methacrylic acid esters (for example, containing 50% by weight or more). It is preferably a copolymer obtained by copolymerizing another copolymer component with the copolymer. The (meth) acrylic resin may contain two or more types of structural units derived from a methacrylic acid ester. Examples of the methacrylate include C ₁ -C ₄ alkyl esters of methacrylic acid such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate.

Examples of the copolymerizable component that can be copolymerized with the methacrylate ester include an acrylate ester. The acrylate is preferably a C ₁ -C ₈ alkyl ester of acrylic acid, such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and the like. Specific examples of other copolymer components include unsaturated acids such as (meth) acrylic acid; aromatic vinyl compounds such as styrene, halogenated styrene, α-methylstyrene, and vinyl toluene; vinyl cyanide compounds such as (meth) acrylonitrile Unsaturated acid anhydrides such as maleic anhydride and citraconic anhydride; unsaturated imides such as phenylmaleimide and cyclohexylmaleimide, and other than acrylic acid esters having one polymerizable carbon-carbon double bond in the molecule. Compounds can be mentioned. A compound having two or more polymerizable carbon-carbon double bonds in the molecule may be used as a copolymer component. As the copolymerization component, one type may be used alone, or two or more types may be used in combination.

  The (meth) acrylic resin may have a ring structure in the polymer main chain from the viewpoint of increasing 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 the cyclic acid anhydride structure include a glutaric anhydride structure and a succinic anhydride structure; specific examples of the cyclic imide structure include a glutarimide structure and a succinimide structure; and specific examples of the lactone ring structure include a butyrolactone ring. And a valerolactone ring structure.

The (meth) acrylic resin may contain acrylic rubber particles from the viewpoint of film-forming properties on the film, impact resistance of the film, and the like. Acrylic rubber particles are particles containing an elastic polymer mainly composed of an acrylate ester as an essential component, and have a single-layer structure consisting essentially of the elastic polymer or a single layer of the elastic polymer. Having a multi-layer structure. Examples of the elastic polymer include a crosslinked elastic copolymer obtained by copolymerizing another vinyl monomer and a crosslinkable monomer copolymerizable with an alkyl acrylate as a main component. Examples of the alkyl acrylate which is a 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 copolymerizable with the alkyl acrylate include compounds having one polymerizable carbon-carbon double bond in the molecule, and more specifically, methacrylic acid such as methyl methacrylate. Examples include aromatic vinyl compounds such as esters and styrene, and vinyl cyanide compounds such as (meth) acrylonitrile. Examples of the crosslinkable monomer include a crosslinkable compound having at least two polymerizable carbon-carbon double bonds in the molecule, and more specifically, ethylene glycol di (meth) acrylate, butanediol di ( Examples thereof include (meth) acrylates of polyhydric alcohols such as (meth) acrylate, alkenyl esters of (meth) acrylic acid such as allyl (meth) acrylate, and divinylbenzene.

  The content of the acrylic rubber particles is preferably at least 5 parts by weight, more preferably at least 10 parts by weight, based on 100 parts by weight of the (meth) acrylic resin. If the content of the acrylic rubber particles is too large, the surface hardness of the film may decrease, and 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 the acrylic rubber particles is usually 80 parts by weight or less, 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 can contain usual additives in the technical field of the present invention. Specific examples of additives include, for example, ultraviolet absorbers, infrared absorbers, organic dyes, pigments, inorganic dyes, antioxidants, antistatic agents, surfactants, lubricants, dispersants, heat stabilizers, and the like. .

  Examples of the ultraviolet absorber include a salicylic acid ester compound, a benzophenone compound, a benzotriazole compound, a triazine compound, a cyano (meth) acrylate compound, and a nickel complex salt.

  Each of the first and second resin films 3 and 4 may be an unstretched film or a uniaxially or biaxially stretched film. The biaxial stretching may be simultaneous biaxial stretching in which stretching is performed simultaneously in two stretching directions, or sequential biaxial stretching in which stretching is performed in another direction after stretching in a predetermined direction. The first resin film 3 and / or the second resin film 4 may be a protective film having a role of protecting the polarizer 2 or a protective film having an optical function such as a retardation film described later. Can also. The retardation film is an optical film exhibiting optical anisotropy. For example, an arbitrary retardation value is given by stretching a film made of the thermoplastic resin (such as uniaxial stretching or biaxial stretching) or by forming a liquid crystal layer or the like on the thermoplastic resin film. It can be a retardation film.

  The first resin film 3 and the second resin film 4 may be films made of the same thermoplastic resin or films made of different thermoplastic resins. The first resin film 3 and the second resin film 4 may be the same or different in the thickness, the presence or absence of additives, the type thereof, the retardation characteristics, and the like.

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

  The thickness of each of the first resin film 3 and the second resin film 4 is usually 1 to 150 μm, preferably 5 to 100 μm, and more preferably 5 to 60 μm. The thickness may be 50 μm or less, or even 30 μm or less. Reducing the thickness of the first and second resin films 3 and 4 can be achieved by reducing the thickness of the optical film 1 with an adhesive layer and the optical laminate, and furthermore, a liquid crystal display device including the optical film 1 with an adhesive layer or the optical laminate. This is advantageous for reducing the film thickness.

  In particular, in the case of a polarizing plate for small and medium-sized devices such as smartphones and tablet terminals, a thin film having a thickness of 30 μm or less is often used as the first resin film 3 and / or the second resin film 4 due to a demand for thinning. Such a polarizing plate has a weak force of suppressing the contraction force of the polarizer 2 and tends to have insufficient durability. According to the present invention, even when such a polarizing plate is used as the optical film 10, the optical film 1 with an adhesive layer and the optical laminate having good durability can be provided. The durability of the optical film with an adhesive layer 1 and the optical laminate refers to the adhesive layer 20 and an optical layer adjacent thereto in, for example, a high-temperature environment, a high-temperature, high-humidity environment, or an environment in which high and low temperatures are repeated. It refers to a property that can suppress inconveniences such as floating and peeling at the interface with the member and foaming of the pressure-sensitive adhesive layer 20.

  Further, from the viewpoint of reducing the thickness of the polarizing plate, a configuration in which a resin film is disposed on only one surface of the polarizer 2 as in the polarizing plate 10a illustrated in FIG. 2 is advantageous. In this case, usually, the pressure-sensitive adhesive layer 20 is directly bonded to the other surface of the polarizer 2 to form the optical film 1 with the pressure-sensitive adhesive layer (see FIG. 4). In the case of a polarizing plate having such a configuration, the problem of deteriorating the optical performance of the polarizing plate in a high-temperature and high-humidity environment due to the ionic compound contained in the pressure-sensitive adhesive layer 20 is particularly significant. According to the present invention, even when such a polarizing plate is used as the optical film 10, the optical film 1 with the pressure-sensitive adhesive layer and the optical laminate having good optical durability (a property capable of suppressing deterioration of optical characteristics). Can be provided.

  The first and second resin films 3 and 4 can be bonded to the polarizer 2 via an adhesive layer or a pressure-sensitive 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 the aqueous adhesive include an adhesive composed of an aqueous solution of a polyvinyl alcohol-based resin, an aqueous two-part urethane-based emulsion adhesive, and the like. Among them, a water-based adhesive composed of an aqueous solution of a polyvinyl alcohol-based resin is preferably used. Examples of the polyvinyl alcohol resin include a vinyl alcohol homopolymer obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, and a copolymer of vinyl acetate with another monomer copolymerizable therewith. A polyvinyl alcohol-based copolymer obtained by saponifying a polymer, a modified polyvinyl alcohol-based polymer obtained by partially modifying a hydroxyl group thereof, or the like can be used. The water-based adhesive can contain a crosslinking agent such as an aldehyde compound, an epoxy compound, a melamine compound, a methylol compound, an isocyanate compound, an amine compound, and a polyvalent metal salt.

  When an aqueous adhesive is used, a step of laminating the polarizer 2 and the first and second resin films 3 and 4 and then drying the adhesive to remove water contained in the aqueous adhesive is performed. Is preferred. After the drying step, for example, a curing step of curing at a temperature of about 20 to 45 ° C. may be provided.

  The active energy ray-curable adhesive refers to an adhesive that cures when irradiated with an active energy ray such as an ultraviolet ray or an electron beam, and includes, for example, a curable composition containing a polymerizable compound and a photopolymerization initiator, A curable composition containing a reactive resin, a curable composition containing a binder resin and a photoreactive crosslinking agent, and the like can be given. 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 those containing substances that generate active species such as neutral radicals, anion radicals, and cation radicals upon irradiation with active energy rays. As an active energy ray-curable adhesive containing a polymerizable compound and a photopolymerization initiator, a curable composition containing a photocurable epoxy monomer and a photocationic polymerization initiator, and a photocurable (meth) acrylic monomer and a light curable composition. A curable composition containing a radical polymerization initiator or a mixture of these curable compositions can be preferably used.

  When using an active energy ray-curable adhesive, after laminating the polarizer 2 and the first and second resin films 3 and 4, perform a drying step as necessary, and then irradiate with an active energy ray. A curing step for curing the active energy ray-curable adhesive is performed. Although the light source of the active energy ray is not particularly limited, ultraviolet light having a light emission distribution at a wavelength of 400 nm or less is preferable, and specifically, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a chemical lamp, a black light lamp, and a micro light A wave excitation mercury lamp, a metal halide lamp, or the like can be used.

  In laminating the polarizer 2 and the first and second resin films 3 and 4, at least one of these lamination surfaces is subjected to a surface activation treatment such as a saponification treatment, a corona treatment, or a plasma treatment. be able to. When resin films are bonded on both surfaces of the polarizer 2, the adhesive for bonding these resin films may be the same type of adhesive or different types of adhesives.

  The polarizing plates 10a and 10b can further include other films or layers. Specific examples thereof include, in addition to a retardation film described below, a brightness enhancement film, an antiglare film, an antireflection film, a diffusion film, a light-condensing film, an adhesive layer other than the adhesive layer 20, a coating layer, and a protect 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 dirt. The protect film is peeled and removed after the optical film with an adhesive layer 1 is bonded to, for example, a metal layer 30. It is customary.

  The protection film is usually composed of a base film and an adhesive layer laminated thereon. The base film is made of a thermoplastic resin, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin; a polyester resin such as polyethylene terephthalate or polyethylene naphthalate; a polycarbonate resin; a (meth) acrylic resin or the like. be able to.

[1-2] Retardation Plate The retardation film included in the retardation plate is an optical film exhibiting optical anisotropy as described above, and can be used for the first and second resin films 3 and 4. In addition to the thermoplastic resins exemplified above, for example, polyvinyl alcohol resin, polyarylate resin, polyimide resin, polyethersulfone resin, polyvinylidene fluoride / polymethyl methacrylate resin, liquid crystal polyester resin, It can be a stretched film obtained by stretching a resin film composed of a saponified ethylene-vinyl acetate copolymer, a polyvinyl chloride-based resin, etc. to about 1.01 to 6 times. Among them, a stretched film obtained by uniaxially or biaxially stretching a polycarbonate resin film, a cyclic olefin resin film, a (meth) acrylic resin film, or a cellulose resin film is preferable. In this specification, a zero retardation film is also included in the retardation film (however, it can be used as a protective film). In addition, films referred to as a uniaxial retardation film, a wide viewing angle retardation film, a low photoelastic modulus retardation film, and the like are also applicable as the retardation film.

The zero Letters retardation film in-plane retardation value R _e and the thickness direction retardation R _th means a film are both -15～15Nm. This retardation film is suitably used for an IPS mode liquid crystal display device. Plane retardation value R _e and the thickness direction retardation R _th are preferably both -10～10Nm, more preferably both -5～5Nm. The in-plane retardation value _Re and the thickness direction retardation value _Rth here are values at a wavelength of 590 nm.

The in-plane retardation value _Re and the thickness direction retardation value _Rth are respectively represented by the following formulas:
_{R e = (n x -n y} ) × d
R _th = [( _nx + _ny ) / 2− _nz ] × d
Is defined by Wherein, n _x is a refractive index in a slow axis direction (x-axis direction) in the film plane, n _y is the fast axis direction in the film plane of the (y-axis direction orthogonal to the x-axis in a plane) the refractive index, n _z is the refractive index of the film thickness direction (z-axis direction orthogonal to the film surface), d is the thickness of the film.

  As the zero retardation film, for example, a resin film made of a polyolefin resin such as a cellulose resin, a chain polyolefin resin and a cyclic polyolefin resin, a polyethylene terephthalate resin, or a (meth) acrylic resin can be used. In particular, a cellulose resin, a polyolefin resin, or a (meth) acrylic resin is preferably used because the retardation value is easily controlled and easily available.

  In addition, a film in which optical anisotropy is developed by coating and orientation of a liquid crystalline compound and a film in which optical anisotropy is developed by coating an inorganic layered compound can be used as the retardation film. Such retardation films include a so-called temperature-compensated retardation film, and a rod-like liquid crystal sold by JX Nippon Oil & Energy Co., Ltd. under the trade name of "NH film". Film, a film with disc-shaped liquid crystal tilted and sold by Fuji Film Co., Ltd. under the brand name of "WV Film", a complete biaxial film sold by Sumitomo Chemical Co., Ltd. under the brand name of "VAC Film" There are orientation type films, and biaxial orientation type films which are also sold by Sumitomo Chemical Co., Ltd. under the trade name of “new VAC film”.

  The resin film laminated on at least one surface of the retardation film can be, for example, the above-described protective film.

[2] Pressure-sensitive adhesive layer The pressure-sensitive adhesive layer 20 disposed between the optical film 10 and the metal layer 30 is made of a (meth) acrylic resin (A), a silane compound (B), and an ionic compound (C). And preferably further comprises an isocyanate-based crosslinking agent (D). In this pressure-sensitive adhesive composition, the silane compound (B) is represented by the following formula (I):

Is a silane compound represented by In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH constituting the alkanediyl group and the alicyclic hydrocarbon group ₂ - is -O- or -C (= O) - may be replaced to, R ¹ represents an alkyl group having 1 to 5 carbon atoms, R ^2, R ^3, R ^4, R ⁵ and R ⁶ each independently represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms.

  According to the pressure-sensitive adhesive layer 20 composed of the above-described pressure-sensitive adhesive composition, corrosion of the metal layer 30 can be suppressed in an optical laminate having a configuration including the pressure-sensitive adhesive layer 20 and the metal layer 30, and the pressure-sensitive adhesive The durability of the layered optical film 1 and the optical laminate can be increased. Furthermore, according to the pressure-sensitive adhesive layer 20 composed of the above-described pressure-sensitive adhesive composition, the optical film 1 with a pressure-sensitive adhesive layer and the optical laminate have a configuration in which the pressure-sensitive adhesive layer 20 is directly bonded to the polarizer 2. Even with this, good optical durability can be exhibited.

  The thickness of the pressure-sensitive adhesive layer 20 is usually 2 to 40 μm, and preferably 5 to 30 μm from the viewpoint of the durability of the optical film 1 with the pressure-sensitive adhesive layer and the optical laminate and the reworkability of the optical film 1 with the pressure-sensitive adhesive layer. And more preferably 10 to 25 μm. When the thickness of the pressure-sensitive adhesive layer 20 is 10 μm or more, the followability of the pressure-sensitive adhesive layer 20 to the dimensional change of the optical film 10 becomes good, and when it is 25 μm or less, the reworkability becomes good.

  The pressure-sensitive adhesive layer 20 preferably has a storage elastic modulus of 0.1 to 5 MPa in a temperature range of 23 to 80 ° C. Thereby, the durability of the optical film 1 with an adhesive layer and the optical laminate can be more effectively increased. “Showing a storage modulus of 0.1 to 5 MPa in a temperature range of 23 to 80 ° C.” means that the storage modulus is a value within the above range at any temperature in this range. Since the storage modulus usually decreases gradually as the temperature rises, if the storage modulus at 23 ° C. and 80 ° C. are both within the above range, the storage modulus within the above range is exhibited at the temperature in this range. Can be seen. The storage modulus of the pressure-sensitive adhesive layer 20 can be measured using a commercially available viscoelasticity measuring device, for example, a 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 a copolymer having a constitutional unit derived from a (meth) acrylic monomer as a main component (preferably containing 50% by weight or more). The (meth) acrylic monomer includes, for example, a monomer having a (meth) acryloyl group, and preferably includes an alkyl (meth) acrylate. The alkyl group of the alkyl (meth) acrylate preferably has 1 to 14, more preferably 1 to 12, and still more preferably 1 to 8, and may be linear, branched or cyclic. As the alkyl (meth) acrylate, a substituent-containing alkyl (meth) acrylate such as a substituent-containing alkyl acrylate in which a substituent is introduced into an alkyl group described later can also be used. As the alkyl (meth) acrylate, one type may be used alone, or two or more types may be used in combination.

  Specific examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n- and i-propyl (meth) acrylate, n-, i- and t-butyl (meth) acrylate, n- and i-pentyl acrylate, 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, isobornyl (meth) acrylate, n- and i-dodecyl (meth) acrylate, stearyl (meth) acrylate and the like. Including.

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

  Specific examples of the alkyl acrylate (a1) include ethyl acrylate, n- and i-propyl acrylate, n- and i-butyl acrylate, n-pentyl acrylate, n- and i-hexyl acrylate, n-heptyl acrylate, n- And alkyl groups having about 2 to 12 carbon atoms of an alkyl group such as i-octyl acrylate, 2-ethylhexyl acrylate, n- and i-nonyl acrylate, n- and i-decyl acrylate, and n-dodecyl acrylate. . Another specific example of the alkyl acrylate (a1) includes a substituent-containing alkyl acrylate in which a substituent is introduced into an alkyl group in an alkyl acrylate having about 2 to 12 carbon atoms. The substituent of the substituent-containing alkyl acrylate is a group that substitutes a hydrogen atom of the alkyl group, and specific examples thereof include a phenyl group, an alkoxy group, and a phenoxy group. Specific examples of the substituent-containing alkyl acrylate include 2-methoxyethyl acrylate, ethoxymethyl acrylate, phenoxyethyl acrylate, and phenoxydiethylene glycol acrylate. The alkyl group of the alkyl acrylate (a1) may have an alicyclic structure, but is preferably a linear or branched alkyl group.

  As the alkyl acrylate (a1), only one type may be used, or two or more types may be used in combination. Among them, the alkyl acrylate (a1) preferably contains one or more selected from ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate. The alkyl acrylate (a1) preferably contains n-butyl acrylate from the viewpoint of the followability of the pressure-sensitive adhesive layer 20 of the optical film 1 with the pressure-sensitive adhesive layer 1 to the optical film 10 and the reworkability.

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

  As the alkyl acrylate (a2), only one type may be used, or two or more types may be used in combination. Above all, from the viewpoints of metal corrosion resistance and durability, the alkyl acrylate (a2) preferably contains methyl acrylate, cyclohexyl acrylate, isobornyl acrylate, and the like, and more preferably contains methyl acrylate.

  The content of the structural unit derived from the alkyl acrylate (a2) in the (meth) acrylic resin (A) is determined from the viewpoint of the metal corrosion resistance and the durability of the optical film 1 with an adhesive layer and the optical laminate. It is preferably at least 10 parts by weight, more preferably at least 15 parts by weight, still more preferably at least 20 parts by weight, particularly preferably at least 25 parts by weight, based on 100 parts by weight of all constituent units constituting the acrylic resin (A). It is more than weight part. Further, from the viewpoint of the followability of the pressure-sensitive adhesive layer 20 to the optical film 10 and the reworkability, the content of the structural unit derived from the alkyl acrylate (a2) is preferably 70 parts by weight or less, more preferably 60 parts by weight or less. And more preferably 50 parts by weight or less.

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

1) A monomer having a polar functional group.
Examples of the monomer having a polar functional group include (meth) acrylates having a substituent such as a hydroxy 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; acryloyl morpholine, vinyl caprolactam, N-vinyl-2-pyrrolidone, vinylpyridine, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, glycidyl (meth) acrylate, 2,5-dihydrido A monomer having a heterocyclic group such as furan; a monomer having a substituted or unsubstituted amino group such as aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, or dimethylaminopropyl (meth) acrylate; Body; monomers having a carboxyl group such as (meth) acrylic acid and carboxyethyl (meth) acrylate. Above all, a monomer having a hydroxy group is preferable, and a (meth) acrylate having a hydroxy group is more preferable in terms of reactivity between the (meth) acrylic resin (A) and the crosslinking agent.

  Although the above-mentioned monomer having a polar functional group may be contained in combination with the (meth) acrylate having a hydroxy group, the separation force of a separate film that can be laminated on the outer surface of the pressure-sensitive adhesive layer 20 is enhanced. From the viewpoint of prevention, it is preferable that a monomer having an amino group is not substantially contained. In addition, from the viewpoint of increasing the corrosion resistance to ITO, it is preferable that a monomer having a carboxyl group is not substantially contained. Here, “substantially not contained” means that the content is 0.1 part by weight or less in 100 parts by weight of all the constituent units constituting the (meth) acrylic resin (A).

2) Acrylamide monomers.
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-dimethylaminopropyl) 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) acryl Amide, N- (propoxymethyl) acrylamide, N- (1-methylethoxymethyl) acrylamide, N- (1-methylpropoxymethyl) acrylamide, N- (2-methylpropoxymethyl) acrylamide [alias: N- (isobutoxy) Methyl) acrylamide], N- (butoxymethyl) acrylamide, 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 [Also known as N- (2-isobutoxy Chill) acrylamide], N- (2-butoxyethyl) acrylamide, N- [2- (1,1-dimethylethoxy) ethyl] acrylamide. Among them, N- (methoxymethyl) acrylamide, N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (butoxymethyl) acrylamide, and N- (2-methylpropoxymethyl) acrylamide are preferably used.

3) Methacrylates, ie methacrylates.
For example, linear alkyl esters of methacrylic acid such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate; methacrylic acid such as isobutyl methacrylate, 2-ethylhexyl methacrylate, i-octyl methacrylate Alicyclic methacrylic acid such as isobornyl methacrylate, cyclohexyl methacrylate, dicyclopentanyl methacrylate, cyclododecyl methacrylate, methylcyclohexyl methacrylate, trimethylcyclohexyl methacrylate, t-butylcyclohexyl methacrylate and cyclohexylphenyl methacrylate; Alkyl ester; 2-methoxyethyl methacrylate G, ethoxymethyl methacrylate and other alkoxyalkyl esters of methacrylic acid; benzyl methacrylate and other aralkyl methacrylates; 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 2- (2-hydroxyethoxy) ethyl Alkyl esters of methacrylic acid having a hydroxyl group such as methacrylate, 2-chloro-2-hydroxypropyl methacrylate, 3-chloro-2-hydroxypropyl methacrylate, diethylene glycol monomethacrylate; aminoethyl methacrylate, N, N-dimethylaminoethyl methacrylate; Alkyl methacrylic acid having a substituted or unsubstituted amino group such as dimethylaminopropyl methacrylate Ter; methacrylic acid having a phenoxyethyl group such as 2-phenoxyethyl methacrylate, 2- (2-phenoxyethoxy) ethyl methacrylate, ethylene oxide-modified nonylphenol ester of (meth) acrylic acid, and 2- (o-phenylphenoxy) ethyl methacrylate Esters and the like.

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

5) Styrene-based monomers.
For example, styrene; alkylstyrene such as methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene, triethylstyrene, propylstyrene, butylstyrene, hexylstyrene, heptylstyrene, octylstyrene; fluorostyrene, chlorostyrene, bromostyrene, Halogenated styrenes such as dibromostyrene and iodostyrene; nitrostyrene; acetylstyrene; methoxystyrene; divinylbenzene and the like.

6) Vinyl monomers.
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; vinylpyridine And nitrogen-containing aromatic vinyls such as vinylpyrrolidone and vinylcarbazole; conjugated diene monomers such as butadiene, isoprene and chloroprene; unsaturated nitriles such as acrylonitrile and methacrylonitrile.

7) Monomers having a plurality of (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, diethylene glycol di (meth) ) Monomers having two (meth) acryloyl groups in the molecule such as acrylate, tetraethylene glycol di (meth) acrylate, and tripropylene glycol di (meth) acrylate; molecules such as trimethylolpropane tri (meth) acrylate And a monomer having three (meth) acryloyl groups therein.

  As described above, the (meth) acrylic resin (A) is a structural unit derived from an alkyl (meth) acrylate from the viewpoints of durability and metal corrosion resistance of the optical film with an adhesive layer 1 and the optical laminate. In addition, it preferably contains a structural unit derived from a monomer having a polar functional group. The monomer having a polar functional group is preferably a (meth) acrylate monomer having a polar functional group, and more preferably a monomer having a hydroxyl group. The content of the structural unit derived from the monomer having a polar functional group is preferably 0.1 to 10 parts by weight in 100 parts by weight of all the structural units constituting the (meth) acrylic resin (A), More preferably, it is 0.25 to 5 parts by weight, and still more preferably 0.5 to 5 parts by weight.

  Further, from the viewpoint of the reworkability of the optical film 1 with an adhesive layer, the (meth) acrylic resin (A) is derived from a methacrylic monomer such as methacrylate (methacrylic acid ester) and a methacrylamide monomer. It is preferable that the content of the structural unit is small. Specifically, the content of the structural unit is preferably 10 parts by weight, based on 100 parts by weight of all the structural units constituting the (meth) acrylic resin (A). Or less, more preferably 5 parts by weight or less, and even more preferably substantially not containing the constituent unit (0.1 parts by weight or less).

  The (meth) acrylic resin (A) preferably has a single peak in a weight average molecular weight Mw of 1,000 to 2.5 million on an emission curve in gel permeation chromatography (GPC). More preferably, it has a single peak in the range and contains structural units derived from the alkyl acrylates (a1) and (a2). The pressure-sensitive adhesive layer 20 having the (meth) acrylic resin (A) as a base polymer is advantageous in improving the durability of the optical film 1 with a pressure-sensitive adhesive layer and the optical laminate. When the number of peaks in the above range of Mw is 2 or more, sufficient durability tends not to be obtained.

  In obtaining the number of peaks of the GPC emission curve in the range of Mw 1000 to 2.5 million, the emission curve is obtained in accordance with the GPC measurement conditions described in the section of Examples. "Having a single peak" in the above range of the obtained emission curve means having only one maximum value in the range of Mw of 1,000 to 2.5 million. In the present specification, a peak having an S / N ratio of 30 or more is defined as a peak in a GPC emission curve.

  The (meth) acrylic resin (A) preferably has an Mw in terms of standard polystyrene by GPC of 500,000 to 2.5 million, more preferably 600,000 to 2,000,000. 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 tends to be improved. is there. Further, when Mw is 2.5 million or less, the followability of the pressure-sensitive adhesive layer 20 to the dimensional change of the optical film 10 is improved. The molecular weight distribution represented by the ratio Mw / Mn of the weight average molecular weight Mw to 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 section of Examples.

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

  The (meth) acrylic resin (A) preferably has a glass transition temperature Tg measured by a differential scanning calorimeter (DSC) of −60 to −10 ° C., more preferably −55 to −15 ° C. preferable. 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 laminate.

  The pressure-sensitive adhesive composition may contain two or more (meth) acrylic resins belonging to the (meth) acrylic resin (A). The pressure-sensitive adhesive composition may contain another (meth) acrylic resin 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 the (meth) acrylic resin (A) is the total of all (meth) acrylic resins. , Preferably 70% by weight or more, more preferably 80% by weight or more, even more preferably 90% by weight or more. The pressure-sensitive adhesive composition contains only a (meth) acrylic resin (A) as a base polymer. It is particularly preferred to contain.

  The (meth) acrylic resin (A) and other (meth) acrylic resins that can be used in combination as needed can be prepared by known methods such as solution polymerization, bulk polymerization, suspension polymerization, and emulsion polymerization. Can be manufactured. In the production of the (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 the monomers used for producing the (meth) acrylic resin. Further, the (meth) acrylic resin may be produced by a method in which polymerization is promoted by active energy rays such as ultraviolet rays.

  As the polymerization initiator, a thermal polymerization initiator, a photopolymerization initiator, or the like is used. Examples of the photopolymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone. As the 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′-azobis (2-methylpropio Azo) compounds such as 2,2′-azobis (2-hydroxymethylpropionitrile); lauryl peroxide, t-butyl hydroperoxide, benzoyl peroxide, t-butylperoxybenzoate, cumene hydroper Oxide, diisopropylperoxydicarbonate, dipropylperoxydicarbonate, t-butylperoxy Organic peroxides such as neodecanoate, t-butylperoxypivalate, (3,5,5-trimethylhexanoyl) peroxide; inorganic peroxides such as potassium persulfate, ammonium persulfate and hydrogen peroxide; Can be mentioned. Further, a redox initiator using a peroxide and a reducing agent in combination can also be used as the polymerization initiator.

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

[2-2] Silane compound (B)
The pressure-sensitive adhesive composition contains a silane compound (B). The silane compound (B) has the following formula (I):

Is a silane compound represented by In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and -CH constituting the alkanediyl group and the alicyclic hydrocarbon group ₂ - is -O- or -C (= O) - may be replaced to, R ¹ represents an alkyl group having 1 to 5 carbon atoms, R ^2, R ^3, R ^4, R ⁵ and R ⁶ each independently represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms.

  According to the pressure-sensitive adhesive layer 20 containing the silane compound (B) represented by the above formula (I), the metal film of the optical film 1 with a pressure-sensitive adhesive layer and the optical laminate is more resistant to metal corrosion than when other silane compounds are used. Thus, the adhesiveness and durability of the pressure-sensitive adhesive layer 20 and the metal layer 30 and the glass substrate can be improved. Two or more silane compounds (B) may be used.

Specific examples of the alkanediyl group having 1 to 20 carbon atoms that can constitute A in the above formula (I) include a methylene group, a 1,2-ethanediyl group, a 1,3-propanediyl group, and a 1,4-butanediyl group. 1,5-pentanediyl group, 1,6-hexanediyl group, 1,7-heptanediyl group, 1,8-octanediyl group, 1,9-nonanediyl group, 1,10-decanediyl group, 1,12-dodecanediyl Groups, 1,14-tetradecanediyl, 1,16-hexadecanediyl, 1,18-octadecanediyl, and 1,20-icosandiyl. Specific examples of the divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms include a 1,3-cyclopentanediyl group and a 1,4-cyclohexanediyl group. Is -O- or -C (= O) - - -CH 2 constituting the alkanediyl group and alicyclic hydrocarbon group Specific examples of the group replaced _{the, -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 - containing.

In the formula (I), the alkyl group having 1 to 5 carbon atoms that can constitute R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ includes a methyl group, an ethyl group, n- and i- Various pentyl groups such as a propyl group, n-, i- and t-butyl groups, n-, i- and t-pentyl groups are exemplified, and R ² , R ³ , R ⁴ and R in the above formula (I) are exemplified. Examples of the alkoxy group having 1 to 5 carbon atoms that can constitute ⁵ and R ⁶ include a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an i-butoxy group, a t-butoxy group, Various pentyloxy groups such as n-, i- and t-pentyloxy groups are exemplified. The number of carbon atoms 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 above 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 and the like.

  Among them, the silane compound (B) is represented by the following formula (II) 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 a glass substrate. ):

(Wherein, 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) Silane compound represented by the following formula: Specific examples of the alkyl group having 1 to 5 carbon atoms that can constitute R ⁷ are the same as described above. From the same viewpoint as above, the silane compound (B) is more preferably a silane compound represented by the above formula (II) wherein m is an integer of 4 to 20, and m is an integer of 6 to 8. More preferably, it is a silane compound represented by the above formula (II), and 1,6-bis (trimethoxysilyl) hexane, 1,6-bis (triethoxysilyl) hexane, 1,8-bis (trimethoxysilyl) hexane M is an integer of 6 to 8, such as silyl) octane and 1,8-bis (triethoxysilyl) octane, and OR ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and OR ⁷ are each Particularly preferred is a silane compound independently having 1 to 3 carbon atoms (for example, 1 or 2 carbon atoms) and represented by the above formula (II). Examples of suitable m are 6 or 8.

  The pressure-sensitive adhesive composition can contain one or more other silane compounds in addition to the silane compound (B) represented by the above formula (I). Other silane compounds include, for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3- Glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3 -Methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane and the like.

  Other silane compounds can include those of the silicone oligomer type. Specific examples of the silicone oligomer are described below in the form of a combination of monomers.

3-mercaptopropyltrimethoxysilane-tetramethoxysilane oligomer,
3-mercaptopropyltrimethoxysilane-tetraethoxysilane oligomer,
3-mercaptopropyltriethoxysilane-tetramethoxysilane oligomer,
Mercaptopropyl group-containing oligomers such as 3-mercaptopropyltriethoxysilane-tetraethoxysilane oligomer;
Mercaptomethyltrimethoxysilane-tetramethoxysilane oligomer,
Mercaptomethyltrimethoxysilane-tetraethoxysilane oligomer,
Mercaptomethyltriethoxysilane-tetramethoxysilane oligomer,
Mercaptomethyl group-containing oligomers such as mercaptomethyltriethoxysilane-tetraethoxysilane oligomer;
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,
Copolymers containing 3-glycidoxypropyl groups, such as 3-glycidoxypropylmethyldiethoxysilane-tetraethoxysilane copolymer;
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,
Methacryloyloxypropyl group-containing oligomers such as 3-methacryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer;
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,
Acryloyloxypropyl group-containing oligomers such as 3-acryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer;
Vinyltrimethoxysilane-tetramethoxysilane oligomer,
Vinyltrimethoxysilane-tetraethoxysilane oligomer,
Vinyltriethoxysilane-tetramethoxysilane oligomer,
Vinyltriethoxysilane-tetraethoxysilane oligomer,
Vinylmethyldimethoxysilane-tetramethoxysilane oligomer,
Vinylmethyldimethoxysilane-tetraethoxysilane oligomer,
Vinylmethyldiethoxysilane-tetramethoxysilane oligomer,
Vinyl group-containing oligomers such as vinylmethyldiethoxysilane-tetraethoxysilane oligomer;
3-aminopropyltrimethoxysilane-tetramethoxysilane copolymer,
3-aminopropyltrimethoxysilane-tetraethoxysilane copolymer,
3-aminopropyltriethoxysilane-tetramethoxysilane copolymer,
3-aminopropyltriethoxysilane-tetraethoxysilane copolymer,
3-aminopropylmethyldimethoxysilane-tetramethoxysilane copolymer,
3-aminopropylmethyldimethoxysilane-tetraethoxysilane copolymer,
3-aminopropylmethyldiethoxysilane-tetramethoxysilane copolymer,
Amino group-containing copolymers such as 3-aminopropylmethyldiethoxysilane-tetraethoxysilane copolymer;

  However, from the viewpoint of the metal corrosion resistance of the optical film with an adhesive layer 1 and the optical laminate, and the adhesion between the adhesive layer 20 and the metal layer 30 or a 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, even more preferably 90% by weight or more of the total of all the silane compounds. It is particularly preferable to contain only the silane compound (B) as the silane compound.

  The content of the silane compound (B) in the pressure-sensitive adhesive composition is usually 0.01 to 10 parts by weight, preferably 0.03 to 5 parts by weight, based on 100 parts by weight of the (meth) acrylic resin (A). Parts, more preferably 0.05 to 2 parts by weight, even 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 effect of the adhesive layer 20, the metal layer 30, and the glass substrate It is easy to obtain the effect of improving the adhesion to the like. When the content is 10 parts by weight or less, bleed out of the silane compound (B) from the pressure-sensitive adhesive layer 20 can be suppressed.

[2-3] Ionic compound (C)
The pressure-sensitive adhesive composition contains an ionic compound (C). By containing the ionic compound (C), the pressure-sensitive adhesive layer 20 can be given an antistatic ability. Conventionally, when the pressure-sensitive adhesive layer 20 containing an ionic compound is laminated on the metal layer 30, the metal layer 30 may be corroded in a high-temperature and high-humidity environment. An optical film 1 with an agent layer and an optical laminate can be provided. The ionic compound (C) is a compound composed of a cation and an anion. The cation may be an organic cation or an inorganic cation, and the anion may be an organic anion or an inorganic anion. The pressure-sensitive adhesive composition may contain one or more ionic compounds (C).

Specific examples of the organic cation include a pyridinium cation, an imidazolium cation, a piperidinium cation, a pyrrolidinium cation, a tetrahydropyridinium cation, a dihydropyridinium cation, a tetrahydropyrimidium cation, a dihydropyrimidium cation, a pyrazolium cation, and a pyrazium cation. Zolinium cation, ammonium cation, sulfonium cation, phosphonium cation and the like. 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 ⁺ ], cesium cation [Cs ⁺ ]; beryllium cation [Be ²⁺ ], magnesium cation And alkaline earth metal ions such as [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, a pyridinium cation, an imidazolium cation, a piperidinium cation, a pyrrolidinium Organic cations containing nitrogen atoms such as cations, tetrahydropyridinium cations, dihydropyridinium cations, tetrahydropyrimidium cations, dihydropyrimidium cations, pyrazolium cations, pyrazolinium cations, and ammonium cations (even if they have a substituent) And more preferably a cation having a nitrogen-containing heterocyclic structure containing an unsaturated bond.

  Preferable specific examples of the pyridinium cation which is one kind of cation having a nitrogen-containing heterocyclic structure containing an unsaturated bond and which may have a substituent are represented by the following formula (III):

Is a pyridinium cation represented by In the above formula (III), R ^{8 to} R ¹³ each independently represent a hydrogen atom, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, or a substituent. Optionally represents an alkynyl group, an aryl group optionally having a substituent, a heterocyclic group optionally having a substituent, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom; Adjacent substituents may form a ring.

  As the alkyl group which may have a substituent, an alkyl group having 1 to 30 carbon atoms is preferable, and specific examples thereof include, for example, a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, an octyl group, and a decyl group. Group, dodecyl group, octadecyl 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- Methylphenacyl group, 3-fluorophenacyl group, 3-trifluoromethylphenacyl group Including a 3-Nitorofenashiru group.

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

  The aryl group which may have a substituent is preferably an aryl group having 6 to 30 carbon atoms, and specific examples thereof include, for example, a phenyl group, a biphenyl group, a 1-naphthyl group, a 2-naphthyl group, and a 9-anthryl. Group, 9-phenanthryl 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, xylyl group, o-, m-, and p-cumenyl group, mesityl group, pentalenyl group, binaphthalenyl group, ternaphthalenyl group, quaternaphthalenyl group, heptalenyl group, biphenylenyl group, indacenyl group, fluoranthenyl group, acenaphthenyl Group, aceanthrenyl group, phenalenyl group, fluorenyl group, anthryl group, bianthraceni Group, teranthracenyl group, quarteranthracenyl group, anthraquinolyl group, phenanthryl group, triphenylenyl group, pyrenyl group, chrysenyl group, naphthacenyl group, preadenyl group, picenyl group, perylenyl group, pentaphenyl group, pentacenyl group, tetra It includes a phenylenyl group, a hexaphenyl group, a hexacenyl group, a rubicenyl group, a coronenyl group, a trinaphthylenyl group, a heptaphenyl group, a heptacenyl group, a pyrantrenyl group, and an ovarenyl group.

  As the heterocyclic group which may have a substituent, an aromatic or aliphatic heterocyclic ring containing a nitrogen atom, an oxygen atom, a sulfur atom and a phosphorus atom is preferable, 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 , Imidazolyl, pyrazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, indolizinyl, isoindolyl, 3H-indolyl, indolyl, 1H-indazolyl, purinyl, 4H-quinolizinyl, isoquinolyl, quinolyl Group, phthalazinyl group, naphthyridinyl group, quinoxanilyl group, quinazolinyl group, syn Linyl group, pteridinyl group, 4aH-carbazolyl group, carbazolyl group, β-carbolinyl group, phenanthridinyl group, acridinyl group, perimidinyl group, phenanthrolinyl group, phenazinyl group, phensalzinyl 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, pyrazolinyl group, piperidyl group, piperazinyl group, indolinyl group, isoindolinyl group, quinuclidinyl group, quinuclidinyl group , A thioxanthryl group.

  The above-mentioned alkyl group which may have a substituent, alkenyl group which may have a substituent, alkynyl group which may have a substituent, aryl group which may have a substituent, and Specific examples of the substituent capable of substituting a hydrogen atom of the heterocyclic group which may be substituted include, for example, a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; a methoxy group, an ethoxy group, a t-butoxy group and the like. Aryloxy group such as phenoxy group and p-tolyloxy group, alkoxycarbonyl group such as methoxycarbonyl group, butoxycarbonyl group, phenoxycarbonyl group, vinyloxycarbonyl group and aryloxycarbonyl group; acetoxy group and propionyloxy group , An acyloxy group such as a benzoyloxy group; an acetyl group, a benzoyl group, an isobutyryl group, an acryloyl group, Acyl groups such as acryloyl and methoxalyl; alkylsulfanyl such as methylsulfanyl and t-butylsulfanyl; arylsulfanyl such as phenylsulfanyl and p-tolylsulfanyl; alkyls such as methylamino and cyclohexylamino Amino group; dialkylamino group such as dimethylamino group, diethylamino group, morpholino group, piperidino group; arylamino group such as phenylamino group, p-tolylamino group; methyl group, ethyl group, t-butyl group, dodecyl group, etc. Alkyl group; aryl group such as phenyl group, p-tolyl group, xylyl group, cumenyl group, naphthyl group, anthryl group, phenanthryl group; hydroxyl group, carboxyl group, sulfonamide group, formyl group, mercapto group, sulfo group, mesyl Group, p Toluenesulfonyl, amino, nitro, nitroso, cyano, trifluoromethyl, trichloromethyl, trimethylsilyl, phosphinico, phosphono, alkylsulfonyl, arylsulfonyl, trialkylammonium, dimethylsulfonium A mill group, including a triphenylphenacylphosphonium group.

The pyridinium cation represented by the above 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 linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, a hydroxyl group, or a halogen atom, more preferably a hydrogen atom or a carbon atom. It is a linear alkyl group of the formulas 1 to 20.

Specific examples of the inorganic anion that can constitute the ionic compound (C) include chloride anion [Cl ⁻ ], bromide anion [Br ⁻ ], iodide anion [I ⁻ ], tetrachloroaluminate anion [AlCl ₄ ⁻ ], hepta-chloro-di-aluminate anion [Al ₂ Cl ₇ ^-], tetrafluoroborate anion [BF ₄ ^-], hexafluorophosphate anion [PF ₆ ^-], perchlorate anion [ClO ₄ ^-], nitrate anion [NO ₃ ^- ], hexafluoro ah cell anion [AsF ₆ ^-], hexafluoroantimonate anion [SbF ₆ ^-], hexafluoro niobate anions [NbF ₆ ^-], hexafluoro tantalate anion [TaF ₆ ^-], bis (fluorosulfonyl ) imide anion [(FSO _{2) 2} N ^- , (Poly) hydrofluoroether fluoride anion [F (HF) _n ^-] containing (n is about 1 to 3) or the like.

Specific examples of the organic anion that can constitute the ionic compound (C) include an acetate anion [CH ₃ COO ⁻ ], a trifluoroacetate anion [CF ₃ COO ⁻ ], a methanesulfonate anion [CH ₃ SO ₃ ⁻ ], and trifluoromethane. sulfonate 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) meth acetonide anion _{[(CF 3 SO 2) 3 C} - ], dimethyl phosphinate anion [(CH _{3) 2} POO ^-], thiocyanate anion [SCN ^-], perfluorobutane sulfonate anion [C ₄ F ₉ SO ₃ ^-], bis (pentafluoroethane sulfonyl) Imidoani Emissions _{[(C 2 F 5 SO 2)} 2 N - ], perfluoro butanoate anion [C ₃ F ₇ COO ^-], (trifluoromethanesulfonyl) (trifluoromethane carbonyl) imide anion [(CF ₃ SO ₂₎ ( CF ₃ CO) N ^-], perfluoro-1,3-disulfonate anion ^{_{[- O 3 S (CF 2)}} 3 SO 3 - ], carbonate anions [CO ₃ ^2-], tetraarylborate anions (such as tetrakis (Pentafluorophenyl) borate anion, etc.), dicyanamide anion [(CN) ₂ N ⁻ ], and the following formula (IV):

And the like. Among them, an anion containing a fluorine atom is preferable because it tends to give the ionic compound (C) having excellent antistatic performance. In particular, an ionic compound (C) whose anion is a bis (trifluoromethanesulfonyl) imide anion, a bis (fluorosulfonyl) imide anion, an imide anion represented by the above formula (IV), or a tetrakis (pentafluorophenyl) borate anion The use of is advantageous in improving the antistatic performance, metal corrosion resistance, and optical durability of the optical film with an adhesive layer 1 and the optical laminate.

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

  1) The cation has the following formula (III):

Wherein, preferably, R ⁸ is a linear, 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 linear alkyl group having 1 to 20 carbon atoms), wherein the anion is any anion selected from the above group.

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

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

[2-4] Isocyanate-based crosslinking agent (D)
The pressure-sensitive 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 increased. As the isocyanate-based crosslinking agent (D), one type may be used alone, or two or more types may be used in combination.

  The isocyanate-based cross-linking agent (D) is a compound having at least two isocyanato groups (-NCO) in the molecule, and specifically includes tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated Xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, and the like. The isocyanate-based cross-linking agent (D) includes adducts of polyhydric alcohol compounds of these isocyanate compounds (for example, adducts of glycerol and trimethylolpropane), isocyanurates, buret-type compounds, polyether polyols, polyester polyols, and acrylics. A derivative such as a urethane prepolymer-type isocyanate compound obtained by an addition reaction with a polyol, polybutadiene polyol, polyisoprene polyol, or the like may be used. Among the above, tolylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate or a polyhydric alcohol compound adduct of these isocyanate compounds is preferred, and from the viewpoint of durability of the optical film 1 with an adhesive layer and the optical laminate, Diisocyanates or adducts of polyhydric alcohol compounds thereof are more preferred.

  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, based on 100 parts by weight of the (meth) acrylic resin (A). Parts by weight (for example, 1 part by weight or less). When the content of the isocyanate-based cross-linking agent (D) is in this range, it is advantageous in terms of achieving both the metal corrosion resistance and the durability of the optical film 1 with an adhesive layer and the optical laminate.

  The pressure-sensitive adhesive composition can use other cross-linking agents such as an epoxy compound, an aziridine compound, a metal chelate compound, and a peroxide together with the isocyanate-based cross-linking agent (D). From the viewpoint of metal corrosion resistance and durability of the optical laminate, the pressure-sensitive adhesive composition preferably contains only an isocyanate-based crosslinking agent (D) as a crosslinking agent, and particularly contains substantially no peroxide. . Here, “substantially not contained” 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 components The adhesive composition contains a solvent, a crosslinking catalyst, an ultraviolet absorber, a weather stabilizer, a tackifier, a plasticizer, a softener, a dye, a pigment, an inorganic filler, and light-scattering fine particles. One or more agents can be contained. In addition, it is also useful to blend an ultraviolet curable compound into the pressure-sensitive adhesive composition, form a pressure-sensitive adhesive layer, and then irradiate with ultraviolet light to cure the pressure-sensitive adhesive layer to form a harder pressure-sensitive adhesive layer. Examples of the crosslinking catalyst include amine compounds such as hexamethylenediamine, ethylenediamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophoronediamine, trimethylenediamine, polyamino resin, and melamine resin.

  The pressure-sensitive adhesive composition can contain a rust inhibitor that can enhance the metal corrosion resistance of the optical film with a pressure-sensitive adhesive layer 1 and the optical laminate. As rust preventives, benzotriazole compounds, triazole compounds such as other triazole compounds; benzothiazole compounds, thiazole compounds such as other thiazole compounds; benzylimidazole compounds, other imidazole compounds, etc. Imidazole compounds; imidazoline compounds; quinoline compounds; pyridine compounds; pyrimidine compounds; indole compounds; amine compounds; urea compounds; sodium benzoate; benzyl mercapto compounds; di-sec-butyl sulfide; Can be cited.

  However, according to the present invention, since sufficient metal corrosion resistance can be obtained without including a rust preventive, the content of the rust preventive is preferably as small as possible. In particular, the pressure-sensitive adhesive composition preferably does not substantially contain a triazole-based compound as a rust preventive, and more preferably does not substantially contain a rust preventive selected from the above compound group. Here, “substantially not contained” 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 includes, for example, aluminum, copper, silver, gold, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead, and two or more metals selected from these. It can be a layer containing one or more selected from the group consisting of alloys, from the viewpoint of conductivity, preferably a layer containing a metal element selected from the group consisting of aluminum, copper, silver and gold, From the viewpoints of conductivity and cost, a layer containing an aluminum element is more preferable, and a layer containing an aluminum element as a main component is more preferable. To include as a main component means that the metal component constituting the metal layer 30 is 30% by weight or more, more preferably 50% by weight or more of the total metal component.

  The metal layer 30 may be, for example, a metal oxide layer such as ITO. However, since the optical film with an adhesive layer 1 according to the present invention has particularly good corrosion resistance to simple metals and alloys, The layer 30 preferably contains a simple metal composed of the above metal element and / or an alloy containing two or more of the above metal elements. However, the optical laminate may have a transparent electrode layer made of a metal oxide such as ITO, together with such a metal layer 30.

  The form (eg, thickness, etc.) and preparation method of the metal layer 30 are not particularly limited, and may be a metal foil, and may be formed by a vacuum evaporation method, a sputtering method, an ion plating method, an inkjet printing method, or a gravure printing method. However, a metal layer formed by a sputtering method, an inkjet printing method, or a gravure printing method is preferable, and a metal layer formed by a sputtering method is more preferable. In the metal layer and the metal foil formed by sputtering, the former tends to have poor corrosion resistance, but according to the optical laminate according to the present invention, it is also favorable for the metal layer formed by sputtering. Has excellent 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. The thickness of the metal layer 30 is usually 0.01 μm or more. Further, when the metal layer 30 is a metal wiring layer, the line width of the metal wiring included in the metal wiring layer is usually 10 μm or less, preferably 5 μm or less, and more preferably 3 μm or less. 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. The optical laminate according to the present invention exhibits good metal corrosion resistance even for such a thin metal layer 30 or a metal layer 30 formed of a thin metal wire. In particular, even if the metal wiring has a thickness of 3 μm or less and a line width of 10 μm or less, or a metal wiring of a thickness of 3 μm or less and a line width of 10 μm or less and is formed by a sputtering method, the corrosion, especially the hole Food can be suppressed.

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

  Further, the metal layer 30 may have a single-layer structure, or may have a two-layer structure or a multilayer structure of three or more layers. Examples of the metal layer having a multilayer structure include a metal-containing layer (such as a metal mesh) having 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. In this case, the optical laminate according to the present invention includes the substrate 40. The formation of the metal layer 30 on the substrate 40 can be performed by, for example, sputtering. The substrate 40 can be a transparent substrate forming a liquid crystal cell included in the touch input element. Substrate 40 is preferably a glass substrate. Examples of the material for the glass substrate include soda lime glass, low alkali glass, and non-alkali glass. The metal layer 30 may be formed on the entire surface of the substrate 40 or may be formed on a part thereof. When the metal layer 30 is formed on a part of the surface of the substrate 40, for example, when the patterned metal layer 30 is formed on the substrate 40, a part of the adhesive layer 20 is made of, for example, a glass substrate. Although it comes into direct contact with 40, the pressure-sensitive adhesive layer 20 in the optical laminate according to the present invention is also excellent in adhesion to glass, so the optical laminate, and a liquid crystal display device including the same, The durability in such a case is also excellent.

[4] Configuration and Manufacturing Method of Optical Laminate In one embodiment, the optical laminate according to the present invention includes, as shown in FIGS. 4 and 5, an optical film with an adhesive layer 1 and an adhesive layer 20. And a metal layer 30 laminated on the side. In the optical laminates 5 and 6 shown in FIGS. 4 and 5, the optical film with an adhesive layer 1 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, the corrosion of the metal layer 30 can be effectively suppressed even in the optical laminate having the configuration in which the pressure-sensitive adhesive layer 20 directly contacts the metal layer 30.

  FIG. 6 is a schematic sectional view showing another example of the layer configuration of the optical laminate according to the present invention. In another embodiment, the optical laminate according to the present invention is such that the pressure-sensitive adhesive layer 20 of the pressure-sensitive adhesive layer-attached optical film 1 is connected to the metal layer 30 via the resin layer 50 as in the optical laminate 7 shown in FIG. It is laminated. The pressure-sensitive adhesive layer 20 is in direct contact with the resin layer 50. Also in the optical laminated body 7, the 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 cured product layer of a curable resin. As the curable resin that can form the resin layer 50, a known resin can be used, and examples thereof include those described in JP-A-2009-217037.

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

  The optical laminated body is, for example, an optical film with an adhesive layer 1 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 surface thereof. Can be produced by laminating through the pressure-sensitive adhesive layer 20.

  As described above, the optical film with an adhesive layer 1 includes the optical film 10 and the adhesive layer 20 laminated on at least one surface thereof (FIG. 1). The pressure-sensitive adhesive layer 20 may be laminated on both sides of the optical film 10. Usually, the pressure-sensitive adhesive layer 20 is directly laminated on the surface of the optical film 10. When the pressure-sensitive adhesive layer 20 is provided on the surface of the optical film 10, a primer layer is formed on the bonding surface of the optical film 10 and / or the bonding surface of the pressure-sensitive adhesive layer 20, and a surface activation treatment, for example, a plasma treatment, Preferably, a corona treatment or the like is performed, and more preferably, a corona treatment is performed.

  When the optical film 10 is a single-sided protective polarizing plate as shown in FIG. 2, the pressure-sensitive adhesive layer 20 is preferably provided on the polarizer surface, that is, on the surface of the polarizer 2 opposite to the first resin film 3. Are directly laminated. When the optical film 10 is a double-sided protective polarizing plate as shown in FIG. 3, the pressure-sensitive adhesive layer 20 may be laminated on any one of the outer surfaces of the first and second resin films 3 and 4. May be laminated.

  An antistatic layer may be separately provided between the optical film 10 and the pressure-sensitive adhesive layer 20, but since the pressure-sensitive adhesive layer 20 of the present invention can provide excellent antistatic properties by the pressure-sensitive adhesive layer alone, It is preferable that an antistatic layer is not provided between the optical film 10 and the pressure-sensitive adhesive layer 20 in terms of making the laminate thinner and simplifying the laminate production process.

  The optical film with an adhesive layer 1 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 pressure-sensitive adhesive layer 20 is used (for example, at the time of lamination on the metal layer 30). The separate film is, for example, a film made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyalate, which has been subjected to release treatment such as silicone treatment on the surface on which the adhesive layer 20 is formed. Can be.

  The optical film 1 with the pressure-sensitive adhesive layer is prepared by dissolving or dispersing the components constituting the pressure-sensitive adhesive composition in a solvent to form a solvent-containing pressure-sensitive adhesive composition, and then coating and drying the composition on the surface of the optical film 10. To form the pressure-sensitive adhesive layer 20. The optical film with an adhesive layer 1 is formed by forming an adhesive layer 20 on the release-treated surface of a separate film in the same manner as above, and laminating (transferring) the adhesive layer 20 onto the surface of the optical film 10. Can also be obtained.

  An optical laminated body can be obtained by laminating the optical film with an adhesive layer 1 on the metal layer 30 (or the resin layer) via the adhesive layer 20. After the optical film with an adhesive layer 1 is adhered to the metal layer 30 to produce an optical laminate, if there is any problem, the optical film with an adhesive layer 1 is peeled off from the metal layer 30 and separated. The optical film 1 with an adhesive layer may be re-attached to the metal layer 30, that is, a so-called rework operation may be required. The optical laminate according to the present invention is less likely to generate fogging or adhesive residue on the surface of the metal layer 30 after the optical film 1 with the pressure-sensitive adhesive layer is peeled off from the metal layer 30, and is excellent in reworkability. According to the optical laminate according to the present invention, good reworkability can be exhibited even when the surface on which the pressure-sensitive adhesive layer 20 is bonded is not a metal layer 30 but a glass substrate or an ITO layer.

<Liquid crystal display device>
A 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 exhibit 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. The 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 type such as an out-cell type, an on-cell type, an in-cell type, and the touch panel may be operated in a resistive type or a capacitive type (surface type capacitive type, projection type). Any conventionally known method such as a capacitance method) may be used. The optical laminate according to the present invention may be disposed on the viewing side of the touch input element (liquid crystal cell), may be disposed on the backlight side, or may be disposed on both sides. The driving method of the liquid crystal cell may be any conventionally known method such as a TN method, a VA method, an IPS method, a multi-domain method, and an OCB method. In the liquid crystal display device according to the present invention, the substrate 40 included in the optical laminate may be a substrate (typically, a glass substrate) included in the liquid crystal cell.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Hereinafter, parts and percentages representing the amounts used and contents are on a weight basis unless otherwise specified.

<Production Example 1: Production of (meth) acrylic resin (A-1) for pressure-sensitive adhesive layer>
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer, a monomer having a composition shown in Table 1 (the numerical values in Table 1 are parts by weight) was mixed with 81.8 parts of ethyl acetate. The obtained solution was charged. After replacing the air in the reaction vessel with nitrogen gas, the internal temperature was set to 60 ° C. Thereafter, a solution prepared by dissolving 0.12 parts of azobisisobutyronitrile in 10 parts of ethyl acetate was added. After maintaining at the same temperature for 1 hour, while maintaining the internal temperature at 54 to 56 ° C., ethyl acetate is continuously introduced into the reaction vessel at an addition rate of 17.3 parts / Hr so that the polymer concentration becomes approximately 35%. Was added. After maintaining the internal temperature at 54 to 56 ° C. until 12 hours have passed since the start of the addition of ethyl acetate, ethyl acetate was added to adjust the polymer concentration to 20%, and the (meth) acrylic resin ( An ethyl acetate solution of A-1) 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 to the number average molecular weight Mn was 5.32. In the emission curve of gel permeation chromatography (GPC), the component with Mw of 1.39 million showed a single peak, and no other peak was observed in the range of Mw of 1,000 to 2.5 million.

<Production Example 2: Production of (meth) acrylic resin (A-2) for pressure-sensitive adhesive layer>
An ethyl acetate solution of the (meth) acrylic resin (A-2) was obtained in the same manner as in Production Example 1 except that the composition of the monomer was as shown in Table 1 (resin concentration: 20%). ). The weight average molecular weight Mw of the (meth) acrylic resin (A-2) was 14.1 million, and Mw / Mn was 4.71. In the GPC emission curve, the component having Mw of 14.1 million showed a single peak, and no other peak was observed in the range of Mw of 1,000 to 2.5 million.

  In the above production examples, the weight average molecular weight Mw and the number average molecular weight Mn were determined by using four columns of "TSKgel XL" manufactured by Tosoh Corporation and "Shodex GPC KF-" manufactured by Showa Denko KK as columns in a GPC apparatus. 802 "were connected in series, and a total of five tubes were connected in series. Using tetrahydrofuran as an eluent, the sample concentration was 5 mg / mL, the sample introduction volume was 100 μL, the temperature was 40 ° C., and the flow rate was 1 mL / min. Was measured by The conditions for obtaining the GPC emission curve were the same.

  The glass transition temperature Tg was measured using a differential scanning calorimeter (DSC) “EXSTAR DSC6000” manufactured by SII Nanotechnology Co., Ltd. under a nitrogen atmosphere, in a measurement temperature range of −80 to 50 ° C., and at a temperature increase rate of 10 ° C./min. It was measured under the conditions.

  The composition of the monomer in each Production Example (the numerical values in Table 1 are parts by weight), and the number of peaks in the range of Mw 1000 to 2.5 million on the GPC emission curve (in Table 1, denoted as "GPC peak number") Are summarized in Table 1.

The abbreviations in the column of “monomer composition” in Table 1 mean the following monomers.
BA: butyl acrylate (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 pressure-sensitive adhesive composition The ethyl acetate solution (resin concentration: 20%) of the (meth) acrylic resin obtained in the above production example is shown in Table 2 with respect to 100 parts of the solid content of the solution. The silane compound (B), the ionic compound (C), and the isocyanate-based crosslinking agent (D) were mixed in the amounts (parts by weight) shown in Table 2, and ethyl acetate was added so that the solid content concentration became 14%. Thus, a pressure-sensitive adhesive composition was obtained. When the product used contains a solvent or the like, the compounding amount of each compounding component shown in Table 2 is the number of parts by weight as an active ingredient contained therein.

The details of each blended component indicated by an abbreviation in Table 2 are as follows.
(Silane compound)
B-1: The following formula:

A silane compound represented by
B-2: The following formula:

A silane compound represented by
B-3: 3-glycidoxypropyltrimethoxysilane, trade name “KBM403” obtained from Shin-Etsu Chemical Co., Ltd.

(Ionic compound)
C-1: The following formula:

An ionic compound represented by
C-2: The following formula:

An ionic compound represented by
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 crosslinking agent)
D-1: Ethyl acetate solution (solid content 75%) of trimethylolpropane adduct of xylylene diisocyanate, trade name “Takenate D-110N” obtained from Mitsui Chemicals, Inc.

(2) Preparation of Pressure-Sensitive Adhesive Layer Each of the pressure-sensitive adhesive compositions prepared in (1) above was separated from a polyethylene terephthalate film subjected to a release treatment [trade name “PLR-382051 obtained from Lintec Co., Ltd.” ]] Was applied using an applicator so that the thickness after drying was 20 μm, and dried at 100 ° C. for 1 minute to prepare an adhesive layer (adhesive sheet).

(3) Preparation of Optical Film (P-1) with Adhesive Layer Polyvinyl alcohol film having an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol%, and a thickness of 60 μm [Kuraray Co., Ltd. product name “Kuraray Vinylon VF” -PE {6000 "] is immersed in pure water at 37 ° C, and then an aqueous solution containing iodine and potassium iodide (iodine / potassium iodide / water (weight ratio) = 0.04 / 1.5 / 100) At 30 ° C. Then, 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. The film was washed with pure water at 10 ° C. and then dried at 85 ° C. to obtain a polarizer having a thickness of about 23 μm in which iodine was adsorbed and oriented in 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.

  On one surface of the obtained polarizer, a transparent protective film made of a triacetyl cellulose film having a thickness of 25 μm [trade name “KC2UA” manufactured by Konica Minolta Opto Co., Ltd.] was applied via an adhesive made of an aqueous solution of a polyvinyl alcohol resin. And pasted. Next, on the surface of the polarizer opposite to the triacetylcellulose film, a zero retardation film made of a cyclic polyolefin resin having a thickness of 23 μm (trade name “ZEONOR” manufactured by Zeon Corporation) was applied to a polyvinyl alcohol-based film. A polarizing plate was prepared by laminating an adhesive made of an aqueous solution of a resin. Next, the surface of the zero retardation film opposite to the surface in contact with the polarizer is subjected to a corona discharge treatment for improving the adhesion, and then the surface of the pressure-sensitive adhesive layer produced in the above (2) is opposed to the separate film. The side (pressure-sensitive adhesive layer surface) was bonded with a laminator, and then cured for 7 days at a temperature of 23 ° C. and a relative humidity of 65% to obtain an optical film with a pressure-sensitive adhesive layer (P-1).

(4) Preparation of Optical Film with Adhesive Layer (P-2) Polyvinyl alcohol film having an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol%, and a thickness of 30 μm [Kuraray Co., Ltd. product name “Kuraray Vinylon VF” -PE @ 3000 "] is immersed in pure water at 37 ° C., and then an aqueous solution containing iodine and potassium iodide (iodine / potassium iodide / water (weight ratio) = 0.04 / 1.5 / 100). At 30 ° C. Then, 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. The film was washed with pure water at 10 ° C and then dried at 85 ° C to obtain a polarizer having a thickness of about 12 µm in which iodine was adsorbed and oriented in 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 triacetyl cellulose film having a thickness of 25 μm (trade name “KC2UA” manufactured by Konica Minolta Opto Co., Ltd.) was placed on one surface of the obtained polarizer with an adhesive made of an aqueous solution of a polyvinyl alcohol resin. To produce a polarizing plate. Next, the surface (pressure-sensitive adhesive layer surface) of the pressure-sensitive adhesive layer prepared in (2) opposite to the separate film was bonded to the surface of the polarizer opposite to the surface to which the protective film was bonded, using a laminator. Thereafter, curing was performed for 7 days at a temperature of 23 ° C. and a relative humidity of 65% to obtain an optical film with an adhesive layer (P-2).

(5) Evaluation of Metal Corrosion Resistance of Optical Film with Adhesive Layer The optical film with an adhesive layer (P-1) prepared in the above (3) was cut into a test piece having a size of 20 mm × 50 mm. It was stuck to the metal layer side of the attached glass substrate via an adhesive layer. As the glass substrate with a metal layer, a glass substrate (manufactured by Geomatic Corporation) in which a metal aluminum layer having a thickness of about 500 nm was laminated on a non-alkali glass surface by sputtering. After the obtained optical laminated body 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 where the optical film with an adhesive layer was adhered was changed from the back of the glass substrate to the light. And observed through a magnifying glass (loupe) from the surface of the polarizing plate, and pitting corrosion (generation of a hole having a diameter of 0.1 mm or more and capable of transmitting light) was evaluated according to the following criteria. Table 3 shows the results.

5: No pitting or clouding is observed on the metal layer surface
4: The number of pits generated on the surface of the metal layer is 2 or less,
3: The number of pits generated on the surface of the metal layer is 3 to 5,
2: the number of pits generated on the surface of the metal layer is 6 or more;
1: Many pitting corrosions occurred on the entire surface of the metal layer surface, and white turbidity also occurred.

(6) Evaluation of durability of optical film with pressure-sensitive adhesive layer The optical film with pressure-sensitive adhesive layer (P-1) produced in (3) above was measured to be 200 mm x 150 mm so that the stretching axis direction of the polarizing plate was the long side. The sheet was cut into a size, the separated film was peeled off, and the exposed pressure-sensitive adhesive layer surface was bonded to a glass substrate. The obtained test piece to which the glass substrate was attached (the optical film with an adhesive layer to which the glass substrate was attached) was placed in an autoclave at a temperature of 50 ° C. and a pressure of 5 kg / cm ² (490.3 kPa) for 20 minutes. Pressurized. A non-alkali glass product name “Eagle XG” manufactured by Corning was used as the glass substrate. The following three durability tests were performed on the obtained optical laminate.

(Durability test)
A heat resistance test of holding for 750 hours under a drying condition of a temperature of 85 ° C.
・ Humidity and heat resistance test held for 750 hours in an environment of a temperature of 60 ° C. and a relative humidity of 90%,
A heat shock (HS) test in which the operation of maintaining the substrate under a drying condition at a temperature of 85 ° C. for 30 minutes and then maintaining the substrate under a drying condition of a temperature of −40 ° C. for 30 minutes is defined as one cycle, and this cycle is repeated 400 cycles.

  The optical laminate after each test was visually observed, and the presence or absence of appearance change such as floating, peeling, foaming, etc. of the pressure-sensitive adhesive layer was visually observed, and the durability was evaluated according to the following evaluation criteria. Table 3 shows the results.

4: no change in appearance such as floating, peeling, foaming, etc.
3: Almost no change in appearance such as floating, peeling, foaming, etc.
2: Appearance changes such as floating, peeling and foaming are slightly noticeable.
1: Appearance changes such as floating, peeling and foaming are remarkably observed.

(7) Evaluation of reworkability of optical film with pressure-sensitive adhesive layer The optical film with pressure-sensitive adhesive layer (P-1) produced in the above (3) was cut into a test piece having a size of 25 mm x 150 mm. The separator was peeled off from the test piece, and the surface of the pressure-sensitive adhesive was attached to a glass substrate. The obtained test piece to which the glass substrate was attached (the optical film with an adhesive layer to which the glass substrate was attached) was placed in an autoclave at a temperature of 50 ° C. and a pressure of 5 kg / cm ² (490.3 kPa) for 20 minutes. Pressurized. Next, it is stored in an oven at 50 ° C. for 48 hours, and further, the optical film is peeled from the test piece together with the adhesive layer in the 180 ° direction at a speed of 300 mm / min in an atmosphere at a temperature of 23 ° C. and a relative humidity of 50%. did. The state of the glass substrate surface after peeling was observed and evaluated according to the following criteria. Table 3 shows the results.

4: no fogging or the like is observed on the surface of the glass substrate
3: Fogging is hardly recognized on the surface of the glass substrate,
2: fogging or the like is observed on the surface of the glass substrate;
1: The remainder of the pressure-sensitive adhesive layer is observed on the surface of the glass substrate.

(8) Evaluation of Color Detachability of Optical Film with Adhesive Layer The optical film with an adhesive layer (P-2) produced in (4) above was cut into a size of 30 mm × 30 mm, and the separate film was peeled off and exposed. The pressure-sensitive adhesive layer surface was bonded to a glass substrate. A non-alkali glass product name “Eagle XG” manufactured by Corning was used as the glass substrate. About the obtained optical laminated body, the MD transmittance | permeability and TD transmittance | permeability in the wavelength range of 380-780 nm were measured using the spectrophotometer with an integrating sphere [product name "V7100" by JASCO Corporation], and each was measured. single transmittance at a wavelength, calculate the degree of polarization, further JIS Z 8701: 1999 visibility correction by a two-degree visual field (C light source) "color display method -XYZ color system and X ₁₀ Y ₁₀ Z ₁₀ color system" Was performed to determine the visibility-corrected single transmittance (Ty) and the visibility correction polarization degree (Py) before the durability test. The optical laminate was set on a spectrophotometer with an integrating sphere such that light was incident from the glass substrate side with the triacetyl cellulose film side of the polarizing plate being the detector side.

The unit transmittance and the degree of polarization are respectively represented by the following formulas:
Single transmittance (λ) = 0.5 × (Tp (λ) + Tc (λ))
Degree of polarization (λ) = 100 × (Tp (λ) −Tc (λ)) / (Tp (λ) + Tc (λ))
Is defined by Tp (λ) is the transmittance (%) of the optical laminate measured based on the relationship between linearly polarized light having the incident wavelength λ (nm) and parallel Nicol, and Tc (λ) is the transmittance of the incident wavelength λ (nm). It is the transmittance (%) of the optical laminated body measured by the relationship between linearly polarized light and crossed Nicols.

  Next, the optical laminated body is placed in a moist heat environment of a temperature of 80 ° C. and a relative humidity of 90% for 24 hours, further placed in an environment of a temperature of 23 ° C. and a relative humidity of 60% for 24 hours, and subjected to the same method as before the durability test. As a result, Ty and Py after the durability test were determined. Thereafter, Py and Ty before the test were each subtracted from Py and Ty after the test to calculate the amount of change before and after the durability test, thereby obtaining the amount of change in polarization degree (ΔPy) and the amount of change in single transmittance (ΔTy). Table 3 shows ΔPy.

<Production Example 3: Production of (meth) acrylic resin (A-1) for pressure-sensitive adhesive layer>
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer, and a stirrer, a monomer having a composition shown in Table 4 (the values in Table 4 are parts by weight) was mixed with 81.8 parts of ethyl acetate. The obtained solution was charged. After replacing the air in the reaction vessel with nitrogen gas, the internal temperature was set to 60 ° C. Thereafter, a solution prepared by dissolving 0.12 parts of azobisisobutyronitrile in 10 parts of ethyl acetate was added. After maintaining at the same temperature for 1 hour, while maintaining the internal temperature at 54 to 56 ° C., ethyl acetate is continuously introduced into the reaction vessel at an addition rate of 17.3 parts / Hr so that the polymer concentration becomes approximately 35%. Was added. After maintaining the internal temperature at 54 to 56 ° C. until 12 hours have passed since the start of the addition of ethyl acetate, ethyl acetate was added to adjust the polymer concentration to 20%, and the (meth) acrylic resin ( An ethyl acetate solution of A-1) 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 to the number average molecular weight Mn was 5.32. In the emission curve of gel permeation chromatography (GPC), the component with Mw of 1.39 million showed a single peak, and no other peak was observed in the range of Mw of 1,000 to 2.5 million.

  In the above production examples, the weight average molecular weight Mw and the number average molecular weight Mn were determined by using four columns of "TSKgel XL" manufactured by Tosoh Corporation and "Shodex GPC KF-" manufactured by Showa Denko KK as columns in a GPC apparatus. 802 "were connected in series, and a total of five tubes were connected in series. Using tetrahydrofuran as an eluent, the sample concentration was 5 mg / mL, the sample introduction volume was 100 μL, the temperature was 40 ° C., and the flow rate was 1 mL / min. Was measured by The conditions for obtaining the GPC emission curve were the same.

  The glass transition temperature Tg was measured using a differential scanning calorimeter (DSC) “EXSTAR DSC6000” manufactured by SII Nanotechnology Co., Ltd. under a nitrogen atmosphere, in a measurement temperature range of −80 to 50 ° C., and at a temperature increase rate of 10 ° C./min. It was measured under the conditions.

  The composition of the monomer in Production Example 3 (the numerical values in Table 4 are parts by weight), and the number of peaks in the range of Mw 1000 to 2.5 million on the GPC emission curve (in Table 4, denoted as "GPC peak number"). Are summarized in Table 4.

The abbreviations in the column of “monomer composition” in Table 4 mean the following monomers.
BA: butyl acrylate (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 pressure-sensitive adhesive composition The ethyl acetate solution (resin concentration: 20%) of the (meth) acrylic resin obtained in the above Production Example is shown in Table 5 with respect to 100 parts of the solid content of the solution. The silane compound (B), the ionic compound (C), and the isocyanate-based crosslinking agent (D) were mixed in the amounts (parts by weight) shown in Table 5, and ethyl acetate was added so that the solid concentration became 14%. Thus, a pressure-sensitive adhesive composition was obtained. When the product used contains a solvent or the like, the amount of each component shown in Table 5 is the number of parts by weight as an active ingredient contained therein.

The details of each blended component indicated by an abbreviation in Table 5 are as follows.
(Silane compound)
B-1: The following formula:

A silane compound represented by
B-3: 3-glycidoxypropyltrimethoxysilane, trade name “KBM403” obtained from Shin-Etsu Chemical Co., Ltd.

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

(Isocyanate crosslinking agent)
D-1: Ethyl acetate solution (solid content 75%) of trimethylolpropane adduct of xylylene diisocyanate, trade name “Takenate D-110N” obtained from Mitsui Chemicals, Inc.

(2) Preparation of Pressure-Sensitive Adhesive Layer Each of the pressure-sensitive adhesive compositions prepared in (1) above was separated from a polyethylene terephthalate film subjected to a release treatment [trade name “PLR-382051 obtained from Lintec Co., Ltd.” ]] Was applied using an applicator so that the thickness after drying was 20 μm, and dried at 100 ° C. for 1 minute to prepare an adhesive layer (adhesive sheet).

(3) Preparation of Optical Film (P-1) with Adhesive Layer Polyvinyl alcohol film having an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol%, and a thickness of 60 μm [Kuraray Co., Ltd. product name “Kuraray Vinylon VF” -PE {6000 "] is immersed in pure water at 37 ° C, and then an aqueous solution containing iodine and potassium iodide (iodine / potassium iodide / water (weight ratio) = 0.04 / 1.5 / 100) At 30 ° C. Then, 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. The film was washed with pure water at 10 ° C. and then dried at 85 ° C. to obtain a polarizer having a thickness of about 23 μm in which iodine was adsorbed and oriented in 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.

  On one surface of the obtained polarizer, a transparent protective film made of a triacetyl cellulose film having a thickness of 25 μm [trade name “KC2UA” manufactured by Konica Minolta Opto Co., Ltd.] was applied via an adhesive made of an aqueous solution of a polyvinyl alcohol resin. And pasted. Next, on the surface of the polarizer opposite to the triacetylcellulose film, a zero retardation film made of a cyclic polyolefin resin having a thickness of 23 μm (trade name “ZEONOR” manufactured by Zeon Corporation) was applied to a polyvinyl alcohol-based film. A polarizing plate was prepared by laminating an adhesive made of an aqueous solution of a resin. Next, the surface of the zero retardation film opposite to the surface in contact with the polarizer is subjected to a corona discharge treatment for improving the adhesion, and then the surface of the pressure-sensitive adhesive layer produced in the above (2) is opposed to the separate film. The side (pressure-sensitive adhesive layer surface) was bonded with a laminator, and then cured for 7 days at a temperature of 23 ° C. and a relative humidity of 65% to obtain an optical film with a pressure-sensitive adhesive layer (P-1).

(4) Evaluation of Metal Corrosion Resistance of Optical Film with Adhesive Layer The optical film with an adhesive layer (P-1) prepared in the above (3) was cut into a test piece having a size of 20 mm × 50 mm. It was stuck to the metal layer side of the attached glass substrate via an adhesive layer. As the glass substrate with a metal layer, a glass substrate (manufactured by Geomatic Corporation) in which a silver alloy (an alloy containing silver as a main component and containing palladium and copper, APC) layer having a thickness of about 500 nm is laminated on a non-alkali glass surface by sputtering. used. After the obtained optical laminated body 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 where the optical film with an adhesive layer was adhered was changed from the back of the glass substrate to the light. Was observed from the polarizing plate surface through a magnifying glass, and pitting corrosion (the generation of holes having a diameter of 0.1 mm or more and capable of transmitting light) was evaluated according to the following criteria. Table 6 shows the results.

5: No pitting or clouding is observed on the metal layer surface
4: The number of pits generated on the surface of the metal layer is 2 or less,
3: The number of pits generated on the surface of the metal layer is 3 to 5,
2: the number of pits generated on the surface of the metal layer is 6 or more;
1: Many pitting corrosions occurred on the entire surface of the metal layer surface, and white turbidity also occurred.

  REFERENCE SIGNS LIST 1 optical film with adhesive layer, 2 polarizer, 3 first resin film, 4 second resin film, 5, 6, 7 optical laminate, 10 optical film, 10 a, 10 b polarizing plate, 20 adhesive layer, 30 metal Layers, 40 substrates, 50 resin layers.

Claims (20)

Including an optical film, an adhesive layer, and a metal layer in this order,
The pressure-sensitive adhesive layer is composed of (meth) acrylic resin (A), the silane compound (B), ion-compound (C), and pressure-sensitive adhesive composition comprising an isocyanate-based crosslinking agent (D),
The silane compound (B) has 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 constitutes the alkanediyl group and the alicyclic hydrocarbon group. CH ₂ — may be replaced by —O— or —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 independently represents an alkoxy group having a carbon number of 1-5.)
In Ri silane compound der represented,
The ionic compound (C) contains one or more of [i] an ionic compound containing an organic cation or an organic anion, and [ii] an ionic compound containing an anion containing a fluorine atom. , Optical laminate.   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 an alloy containing two or more metals selected from these. The optical laminate according to claim 1, comprising:   The optical laminate according to claim 1, wherein the metal layer includes an aluminum element.   The optical laminate according to any one of claims 1 to 3, wherein the metal layer is a layer formed by sputtering.   The optical laminate according to any one of claims 1 to 4, wherein the metal layer has a thickness of 3 µm or less.   The optical laminate according to any one of claims 1 to 5, wherein the metal layer is a metal wiring layer.   The optical laminate according to claim 6, wherein the metal wiring of the metal wiring layer has a line width of 10 µm or less. The silane compound (B) represented by the formula (I) is represented by the following formula (II):

(Wherein, 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) Represents.)
The optical laminate according to any one of claims 1 to 7, which is a silane compound represented by the following formula:   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 any one of claims 1 to 11, wherein the silane compound (B) is 1,6-bis (trimethoxysilyl) hexane.   The content of the silane compound (B) in the pressure-sensitive 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 any one of the above.   The optical laminate according to any one of claims 1 to 13, wherein the (meth) acrylic resin (A) contains a structural unit derived from a monomer having a hydroxyl group.   The (meth) acrylic resin (A) includes a structural unit derived from an alkyl acrylate (a1) having a homopolymer having a glass transition temperature of less than 0 ° C, and an alkyl acrylate having a homopolymer having a glass transition temperature of 0 ° C or more. The optical laminate according to any one of claims 1 to 14, comprising a structural unit derived from a2).   The optical laminate according to any one of claims 1 to 15, wherein the (meth) acrylic resin (A) has a weight average molecular weight of 500,000 to 2,500,000. The optical laminate according to any one of claims 1 to 16 , wherein the pressure-sensitive adhesive composition does not substantially contain a triazole-based compound. A liquid crystal display device comprising the optical laminate according to any one of claims 1 to 17 . (Meth) comprises acrylic resin (A), the silane compound (B), ion-compound (C), and an isocyanate-based crosslinking agent (D),
The silane compound (B) has 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 constitutes the alkanediyl group and the alicyclic hydrocarbon group. CH ₂ — may be replaced by —O— or —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 independently represents an alkoxy group having a carbon number of 1-5.)
Is a silane compound represented by
The ionic compound (C) contains one or more of [i] an ionic compound containing an organic cation or an organic anion, and [ii] an ionic compound containing an anion containing a fluorine atom. ,
An adhesive composition used for forming an adhesive layer laminated on a metal layer. An optical film, comprising an adhesive layer laminated on at least one surface of the optical film, an optical film with an adhesive layer for laminating on a metal layer via the adhesive layer,
The pressure-sensitive adhesive layer,
(Meth) comprises acrylic resin (A), the silane compound (B), ion-compound (C), and an isocyanate-based crosslinking agent (D),
The silane compound (B) has 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 constitutes the alkanediyl group and the alicyclic hydrocarbon group. CH ₂ — may be replaced by —O— or —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 independently represents an alkoxy group having a carbon number of 1-5.)
In Ri silane compound der represented,
The ionic compound (C) contains one or more of [i] an ionic compound containing an organic cation or an organic anion, and [ii] an ionic compound containing an anion containing a fluorine atom. ,
An optical film with an adhesive layer, which is formed from the adhesive composition.

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