JP6088019B2 - Optical laminate and liquid crystal display device - Google Patents

Description

  The present invention relates to an optical laminate that constitutes an image display device such as a liquid crystal display device, and a liquid crystal display device including the same.

  An optical film typified by a polarizing plate obtained by laminating and laminating 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 or the like 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, the optical film with an adhesive layer by which the adhesive layer was previously provided in the one surface as an optical film is known. Moreover, what added the ionic compound to the adhesive layer in order to provide antistatic property is also known.

JP 2010-229321 A

  2. Description of the Related Art In recent years, liquid crystal display devices have been developed for mobile device applications having a touch panel function typified by smartphones, tablet terminals, and in-vehicle car navigation systems. In such a touch input type liquid crystal display device, the optical film with the pressure-sensitive adhesive layer is disposed so that the pressure-sensitive adhesive layer is in direct contact with, for example, a resin layer or a metal layer made of metal wiring. Sometimes. However, in a configuration in which a metal layer made of a metal material and an adhesive layer containing an ionic compound are combined, the metal layer may corrode in a high temperature and high humidity environment.

  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 the same. An object is 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] An optical film, an adhesive layer, and a metal layer are included in this order,
The said adhesive layer is an optical laminated body containing the ionic compound whose solubility with respect to 100 g of water of 60 degreeC is 6 g or less.

  [2] The optical layered body according to [1], wherein the anion of the ionic compound is a fluorine atom-containing imide anion.

  [3] The optical laminate according to [1], wherein the anion of the ionic compound is a bis (fluorosulfonyl) imide anion or a bis (trifluoromethanesulfonyl) imide anion.

  [4] The optical layered body according to [1], wherein the anion of the ionic compound is a bis (fluorosulfonyl) imide anion.

[5] An optical film, an adhesive layer, and a metal layer are included in this order,
The pressure-sensitive adhesive layer has the following formula (I):

(In the formula, R ¹ and R ² each independently represent a hydrogen atom or a hydrocarbon group having 1 to 16 carbon atoms which may contain a hetero atom, and R ³ may contain a hetero atom. Represents a hydrocarbon group having 4 to 20 carbon atoms, and X ⁻ represents a fluorine atom-containing imide anion.)
The optical laminated body containing the ionic compound represented by these.

[6] The optical layered body according to [5], wherein R ^{3 in the} formula (I) has 4 or 5 carbon atoms.

[7] An optical film, an adhesive layer, and a metal layer are included in this order,
The pressure-sensitive adhesive layer has the following formula (II):

(Wherein R ⁴ represents a linear or branched alkyl group having 3 to 16 carbon atoms, and R ^{5 to} R ⁹ are each independently a hydrogen atom, an alkyl group optionally having a substituent, An alkenyl group which may have a substituent, an alkynyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, hydroxyl A group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring, and X ⁻ represents the same meaning as described above.)
The optical laminated body containing the ionic compound represented by these.

[8] The optical laminate according to [7], wherein R ^{5 to} R ⁹ in the formula (II) each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 16 carbon atoms. .

[9] The optical layered product according to any one of [5] to [8], wherein the X ⁻ is a bis (fluorosulfonyl) imide anion or a bis (trifluoromethanesulfonyl) imide anion.

[10] The optical laminate according to any one of [5] to [8], wherein the X ⁻ is a bis (fluorosulfonyl) imide anion.

[11] The pressure-sensitive adhesive layer further includes a (meth) acrylic resin,
The (meth) acrylic resin is derived from an alkyl acrylate (a1) derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0 ° C, and derived from an alkyl acrylate (a2) derived from a homopolymer having a glass transition temperature of 0 ° C or higher. The optical laminated body in any one of [1]-[10] containing the structural unit of these.

[12] The (meth) acrylic resin, the content of the alkyl acrylate (a2) derived constituent units of the (meth) in all the structural units 100 parts constituting the acrylic resins, 10 parts by weight or more The optical layered body according to [11].

  [13] The optical layered body according to [11] or [12], wherein the alkyl acrylate (a2) includes methyl acrylate.

  [14] 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 laminated body in any one of [1]-[13] containing 1 or more types.

  [15] The optical layered body according to any one of [1] to [14], wherein the metal layer includes an aluminum element.

  [16] The optical layered body according to any one of [1] to [15], wherein the metal layer is a layer formed by sputtering.

  [17] The optical layered body according to any one of [1] to [16], wherein the metal layer has a thickness of 3 μm or less.

[18] A liquid crystal display device comprising the optical laminate according to any one of [1] to [17].
[19] containing a (meth) acrylic resin and an ionic compound,
The ionic compound has a solubility in 100 g of water at 60 ° C. of 6 g or less,
The adhesive composition used for formation of the adhesive layer laminated | stacked on a metal layer.

[20] containing a (meth) acrylic resin and an ionic compound,
The ionic compound has the following formula (I):

(In the formula, R ¹ and R ² each independently represent a hydrogen atom or a hydrocarbon group having 1 to 16 carbon atoms which may contain a hetero atom, and R ³ may contain a hetero atom. Represents a hydrocarbon group having 4 to 20 carbon atoms, and X ⁻ represents a fluorine atom-containing imide anion.)
An ionic compound represented by
The adhesive composition used for formation of the adhesive layer laminated | stacked on a metal layer.

[21] containing a (meth) acrylic resin and an ionic compound,
The ionic compound has the following formula (II):

(Wherein R ⁴ represents a linear or branched alkyl group having 3 to 16 carbon atoms, and R ^{5 to} R ⁹ are each independently a hydrogen atom, an alkyl group optionally having a substituent, An alkenyl group which may have a substituent, an alkynyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, hydroxyl A group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring, and X ⁻ represents the same meaning as described above.)
An ionic compound represented by
The adhesive composition used for formation of the adhesive layer laminated | stacked on a metal layer.

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

It is a schematic sectional drawing which shows an example of the optical laminated body which concerns on this invention. It is a schematic sectional drawing which shows an example of the laminated constitution of a polarizing plate. It is a schematic sectional drawing which shows another example of the laminated constitution of a polarizing plate. It is a schematic sectional drawing which shows an 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. 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 cross-sectional view showing an example of an optical laminate according to the present invention. As shown in FIG. 1, the optical laminate according to the present invention includes an optical film 10, an adhesive layer 20, and a metal layer 30 in this order, and may further include a substrate 40. This optical laminate includes an optical film 1 with an adhesive layer including an optical film 10 and an adhesive layer 20 laminated on at least one surface of the optical layer 10 on a metal layer 30 formed on a substrate 40. It can be bonded via the pressure-sensitive adhesive layer 20.

  The pressure-sensitive adhesive layer 20 is usually laminated directly on the surface of the optical film 10. Moreover, normally, the optical film 1 with an adhesive layer is laminated | stacked on the metal layer 30 so that the adhesive layer 20 may contact | connect the metal layer 30 directly. According to the present invention, in such an optical laminate, 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 an optical film having a single layer structure or an optical film having a multilayer structure. The pressure-sensitive adhesive layer 20 is composed of a pressure-sensitive adhesive composition containing a predetermined ionic compound (D). This pressure-sensitive adhesive composition usually further contains a (meth) acrylic resin (A), and may further contain an isocyanate-based crosslinking agent (B) and / or a silane compound (C). 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 in an image display device such as a liquid crystal display device. (Film having optical properties). The optical film 10 may be an optical film having a single layer structure or an optical film having a multilayer structure. Specific examples of the optical film having a single layer structure include, in addition to a polarizer, optical functional films such as a retardation film, a brightness enhancement film, an antiglare film, an antireflection film, a diffusion film, and a light collecting film. Specific examples of the multilayered optical film include a polarizing plate and a retardation plate. In the present specification, the polarizing plate refers to a film in which a resin film or a resin layer is laminated on at least one surface of a polarizer. A phase difference plate means that a resin film or a resin layer is laminated on at least one surface of a phase difference film. 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 illustrating 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 and bonded to one surface of the polarizer 2, and the polarizing plate 10b shown in FIG. It 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 adhesive layer and an adhesive layer (not shown). The polarizing plates 10a and 10b may include other films and layers other than the first and second resin films 3 and 4.

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

  The polarizer 2 is a film having a property of absorbing linearly polarized light having a vibration surface parallel to the absorption axis and transmitting linearly polarized light having a vibration surface orthogonal to the absorption axis (parallel to the transmission axis). 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 the monomer copolymerizable with vinyl acetate include unsaturated carboxylic acid, olefin, vinyl ether, unsaturated sulfonic acid, (meth) acrylamide having an ammonium group, and the like.

  The saponification degree of the polyvinyl alcohol resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The average degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 to 10000, preferably 1500 to 5000. The average degree of polymerization of the polyvinyl alcohol resin can be determined according to JIS K 6726.

  Usually, what formed the polyvinyl alcohol-type resin into a film is used as a raw film of the polarizer 2. A polyvinyl alcohol-type resin can be formed into a film by a well-known method. The thickness of the raw film is usually 1 to 150 μm, and preferably 10 μm or more in consideration of easiness of stretching.

  The polarizer 2 is, for example, a step of uniaxially stretching the original film, a step of dyeing the film with a dichroic dye and adsorbing the dichroic dye, a step of treating the film with an aqueous boric acid solution, and The film is washed with water and finally dried. 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 even more preferably 10 μm or less, from the viewpoint of thinning the optical film 1 with an adhesive layer.

  A polarizer 2 formed by adsorbing and orienting a dichroic dye on a polyvinyl alcohol-based resin film is as follows: 1) A single film of a polyvinyl alcohol-based resin film is used as a raw film, and this film is uniaxially stretched and dichroic. In addition to the method of dyeing dyes, 2) A base film having a polyvinyl alcohol resin layer was obtained by applying a coating liquid (such as an aqueous solution) containing a polyvinyl alcohol resin to the base film and drying it. Thereafter, this can also be obtained by uniaxially stretching the whole base film, subjecting the stretched polyvinyl alcohol resin layer to a dichroic dye dyeing process, and then peeling and removing the base film. As the base film, a film made of a thermoplastic resin similar to the thermoplastic resin that can constitute the first and second resin films 3 and 4 described later can be used, and preferably a polyester-based resin such as polyethylene terephthalate. , Polycarbonate resins, cellulose resins such as triacetyl cellulose, cyclic polyolefin resins such as norbornene resins, polystyrene resins, and the like. According to the method 2), the production of the thin film polarizer 2 is facilitated. For example, the production of the polarizer 2 having a thickness of 7 μm or less is also facilitated.

  The first and second resin films 3 and 4 are each independently a light-transmitting, preferably optically transparent thermoplastic resin such as a chain polyolefin resin (polyethylene resin, polypropylene resin, etc.). 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; It can be a film made of (meth) acrylic resin; polystyrene resin; polyether ether ketone resin; polysulfone resin, or a mixture or copolymer thereof. Among these, the first and second resin films 3 and 4 are each composed 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 preferable that the resin is selected from the group consisting of a cellulose resin and a cyclic polyolefin resin.

  Examples of the chain polyolefin-based resin include homopolymers of chain olefins such as polyethylene resins and polypropylene resins, and copolymers composed of two or more chain olefins.

  Cyclic polyolefin-based resin is a general term for resins containing, as polymerized units, cyclic olefins typically represented by norbornene, tetracyclododecene (also known as dimethanooctahydronaphthalene) or their derivatives. Specific examples of cyclic polyolefin resins include cyclic olefin ring-opening (co) polymers and hydrogenated products thereof, cyclic olefin addition polymers, cyclic olefins and chain olefins such as ethylene and propylene, or vinyl groups. A copolymer with an aromatic compound, a modified (co) polymer obtained by modifying these with an unsaturated carboxylic acid or a derivative thereof, and the like. Among these, norbornene resins using norbornene monomers such as norbornene and polycyclic norbornene monomers as cyclic olefins are preferably used.

The cellulose-based resin is preferably a cellulose ester-based resin, that is, a cellulose partial or completely esterified product , and examples thereof include cellulose acetate, propionate, butyrate, and mixed esters thereof. Of these, triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose acetate butyrate and the like are preferably used.

  The polyester-based resin is a resin other than the cellulose ester-based resin having an ester bond, and is generally made of a polycondensate of a polyvalent 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, polycyclohexanedimethyl terephthalate, and polycyclohexanedimethyl naphthalate.

  The polycarbonate-based resin is a polyester formed from carbonic acid and glycol or bisphenol. Among these, an aromatic polycarbonate having a diphenylalkane in the molecular chain is preferably used from the viewpoints of heat resistance, weather resistance and acid resistance. As polycarbonate, 2,2-bis (4-hydroxyphenyl) propane (also known as bisphenol A), 2,2-bis (4-hydroxyphenyl) butane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1 Illustrative 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 a structural unit derived from a methacrylic ester (for example, containing 50% by weight or more). The copolymer is preferably a copolymer in which another copolymer component is copolymerized. The (meth) acrylic resin may contain two or more structural units derived from methacrylic acid esters. Examples of the methacrylic acid ester include C _{1 to} C ₄ alkyl esters of methacrylic acid such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate.

Examples of the copolymer component that can be copolymerized with the methacrylic acid ester include acrylic acid esters. Acrylic acid ester is preferably methyl acrylate, ethyl acrylate, butyl acrylate, C ₁ -C ₈ alkyl esters of acrylic acid such as 2-ethylhexyl acrylate. 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 vinyltoluene; vinylcyan compounds such as (meth) acrylonitrile ; Unsaturated acid anhydrides such as maleic anhydride and citraconic anhydride; unsaturated imides such as phenylmaleimide and cyclohexylmaleimide, etc. other than acrylic acid esters having one polymerizable carbon-carbon double bond in the molecule A compound can be mentioned. A compound having two or more polymerizable carbon-carbon double bonds in the molecule may be used as a copolymerization component. Only 1 type may be used for a copolymerization component and it may use 2 or more types together.

  The (meth) acrylic resin may have a ring structure in the polymer main chain in that the durability of the film can be improved. 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. Specific examples of the lactone ring structure include a butyrolactone ring. Structure and valerolactone ring structure.

The (meth) acrylic resin may contain acrylic rubber particles from the viewpoints of film-formability on the film and impact resistance of the film. Acrylic rubber particles are particles having an elastic polymer mainly composed of an acrylate ester as an essential component. The acrylic rubber particles have a single-layer structure consisting essentially of this elastic polymer, or an elastic polymer in one layer. And a multilayer structure having Examples of the elastic polymer include a cross-linked elastic copolymer obtained by copolymerizing an alkyl acrylate as a main component with another vinyl monomer and a cross-linkable monomer copolymerizable therewith. Examples of the alkyl acrylate as the main component of the elastic polymer include C ₁ -C ₈ alkyl esters of acrylic acid such as methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. The number of carbon atoms of the alkyl group is preferably 4 or more.

  Examples of other vinyl monomers copolymerizable with alkyl acrylate include compounds having one polymerizable carbon-carbon double bond in the molecule, and more specifically, methacrylic acid such as methyl methacrylate. Examples thereof include aromatic vinyl compounds such as esters and styrene, vinylcyan compounds such as (meth) acrylonitrile, and the like. 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 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 5 parts by weight or more, more preferably 10 parts by weight or more with respect to 100 parts by weight of the (meth) acrylic resin. When the content of the acrylic rubber particles is too large, the surface hardness of the film is lowered, and when the film is subjected to surface treatment, the solvent resistance against the organic solvent in the surface treatment agent can be lowered. Accordingly, the content of the acrylic rubber particles is usually 80 parts by weight or less, preferably 60 parts by weight or less with respect to 100 parts by weight of the (meth) acrylic resin.

  The 1st, 2nd resin films 3 and 4 can contain the usual additive 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 salicylic acid ester compounds, benzophenone compounds, benzotriazole compounds, triazine compounds, cyano (meth) acrylate compounds, nickel complex salts, and the like.

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

  The first resin film 3 and the second resin film 4 may be films made of the same thermoplastic resin, or may be films made of different thermoplastic resins. The first resin film 3 and the second resin film 4 may be the same or different in thickness, presence / absence of additives, types thereof, 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 antireflection layer, a light diffusion layer, an antistatic layer, an antistatic layer on the outer surface (the surface opposite to the polarizer 2). You may provide surface treatment layers (coating layer), such as a dirty layer and a conductive layer.

  The thickness of the 1st resin film 3 and the 2nd resin film 4 is 1-150 micrometers normally, respectively, Preferably it is 5-100 micrometers, More preferably, it is 5-60 micrometers. The thickness may be 50 μm or less, and further 30 μm or less. Reducing the thickness of the first and second resin films 3 and 4 is to reduce the thickness of the optical film 1 with an adhesive layer and the optical laminate, and consequently the liquid crystal display device including the optical film 1 with an adhesive layer 1 or the optical laminate. This is advantageous for reducing the film thickness.

  In particular, a polarizing plate for small and medium-sized devices such as smartphones and tablet terminals is often used as a thin film having a thickness of 30 μm or less as the first resin film 3 and / or the second resin film 4 because of the demand for thinning. Such a polarizing plate has a weak force to suppress the contraction force of the polarizer 2 and tends to have insufficient durability. According to this invention, even if it is a case where such a polarizing plate is used as the optical film 10, the optical film 1 with an adhesive layer and optical laminated body which have favorable durability can be provided. The durability of the optical film 1 with an adhesive layer and the optical laminate is, for example, an adhesive layer 20 and an optical layer adjacent to the adhesive layer 20 in a high temperature environment, a high temperature and high humidity environment, an environment where high and low temperatures are repeated, The property which can suppress malfunctions, such as a float and peeling in the interface with a member, and foaming of the adhesive layer 20, is said.

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

  Examples of the water-based adhesive include an adhesive made of a polyvinyl alcohol-based resin aqueous solution, an aqueous two-component urethane emulsion adhesive, and the like. Among these, a water-based adhesive composed of a polyvinyl alcohol-based resin aqueous solution is preferably used. Polyvinyl alcohol resins include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith. A polyvinyl alcohol copolymer obtained by saponifying a polymer, a modified polyvinyl alcohol polymer obtained by partially modifying the 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, or a polyvalent metal salt.

  When using an aqueous adhesive, after bonding the polarizer 2 and the first and second resin films 3 and 4, carry out a drying process to remove water contained in the aqueous adhesive. Is preferred. After the drying process, for example, a curing process for 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 active energy rays such as ultraviolet rays and electron beams. For example, a curable composition containing a polymerizable compound and a photopolymerization initiator, light Examples thereof include a curable composition containing a reactive resin, a curable composition containing a binder resin and a photoreactive crosslinking agent. An ultraviolet curable adhesive is preferable. 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 the 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 cationic photopolymerization initiator, a photocurable (meth) acrylic monomer, and light A curable composition containing a radical polymerization initiator or a mixture of these curable compositions can be preferably used.

  When an active energy ray-curable adhesive is used, after the polarizer 2 and the first and second resin films 3 and 4 are bonded, a drying process is performed as necessary, and then an active energy ray is irradiated. A curing step of 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. A wave excitation mercury lamp, a metal halide lamp, etc. can be used.

  In bonding the polarizer 2 and the first and second resin films 3 and 4, at least one of these bonding surfaces is subjected to a surface activation process such as a saponification process, a corona process, or a plasma process. be able to. When resin films are bonded to both sides 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 a retardation film, a brightness enhancement film, an antiglare film, an antireflection film, a diffusion film, a condensing film, an adhesive layer other than the adhesive layer 20, a coating layer, a protective film, and the like. . The protective 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, and is peeled and removed after the optical film 1 with an adhesive layer is bonded onto, for example, the metal layer 30. It is customary.

  The protective film is usually composed of a base film and a pressure-sensitive adhesive layer laminated thereon. The base film is composed of a thermoplastic resin, for example, a polyolefin resin such as polyethylene resin or 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] Phase difference plate The phase difference film included in the phase difference plate is an optical film showing 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 resins, polyarylate resins, polyimide resins, polyether sulfone resins, polyvinylidene fluoride / polymethyl methacrylate resins, liquid crystal polyester resins, It can be a stretched film obtained by stretching a resin film made of an ethylene-vinyl acetate copolymer saponified product, a polyvinyl chloride resin, etc. by about 1.01 to 6 times. Among them, a stretched film obtained by uniaxially stretching 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 the present specification, a zero retardation film is also included in the retardation film (however, it can also be used as a protective film). In addition, a film called a uniaxial retardation film, a wide viewing angle retardation film, a low photoelastic modulus retardation film, or the like is 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. Here plane retardation value refers R _e and the thickness direction retardation R _th is a value at a wavelength of 590 nm.

The in-plane retardation value _Re and the thickness direction retardation value R _th are respectively expressed by the following formulas:
_{R e = (n x -n y} ) × d
R _th = [(n _x + _ny ) / 2−n _z ] × d
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) It is a refractive index, _nz is the refractive index in the film thickness direction (z-axis direction perpendicular to the film surface), and 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.

  Moreover, the film which expressed optical anisotropy by application | coating and orientation of a liquid crystalline compound, and the film which expressed optical anisotropy by application | coating of an inorganic layered compound can also be used as retardation film. In such a retardation film, a so-called temperature compensation type retardation film, and a rod-like liquid crystal sold under the trade name “NH film” from JX Nippon Mining & Energy Co., Ltd. are tilted. Film, a film with a disc-shaped liquid crystal sold under the trade name “WV film” from FUJIFILM Corporation, and a complete biaxial film sold under the trade name “VAC film” from Sumitomo Chemical Co., Ltd. Examples of the orientation type film include a biaxial orientation type film sold by Sumitomo Chemical Co., Ltd. under the trade name “new VAC film”.

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

[2] Pressure-sensitive adhesive layer The pressure-sensitive adhesive layer 20 disposed between the optical film 10 and the metal layer 30 is composed of a pressure-sensitive adhesive composition containing a predetermined ionic compound (D). This pressure-sensitive adhesive composition usually further contains a (meth) acrylic resin (A), and may further contain an isocyanate-based crosslinking agent (B) and / or a silane compound (C).

  According to the pressure-sensitive adhesive layer 20 composed of the above-mentioned pressure-sensitive adhesive composition, corrosion of the metal layer 30 can be suppressed in the optical laminate 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 enhanced. Furthermore, according to the adhesive layer 20 comprised by said adhesive composition, the optical film 1 with an adhesive layer and an optical laminated body show favorable optical durability (property which can suppress deterioration of an optical characteristic). be able to.

  The thickness of the pressure-sensitive adhesive layer 20 is usually 2 to 40 μm, and preferably 5 to 30 μm from the viewpoints 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. More preferably, it is 10-25 micrometers. Moreover, the followability of the adhesive layer 20 with respect to the dimensional change of the optical film 10 becomes favorable as the thickness of the adhesive layer 20 is 10 micrometers or more, and rework property becomes favorable as it is 25 micrometers or less.

  The pressure-sensitive adhesive layer 20 preferably exhibits a storage elastic modulus of 0.1 to 5 MPa in a temperature range of 23 to 80 ° C. Thereby, durability of the optical film 1 with an adhesive layer and an optical laminated body can be improved more effectively. “Shows a storage elastic modulus of 0.1 to 5 MPa in a temperature range of 23 to 80 ° C.” means that the storage elastic modulus is a value within the above range at any temperature within this range. Since the storage elastic modulus usually decreases gradually as the temperature rises, if both the storage elastic modulus at 23 ° C. and 80 ° C. are within the above range, the storage elastic modulus within the above range is exhibited at the temperature in this range. Can be seen. The storage elastic 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 copolymer having a structural 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 carbon atoms, more preferably 1 to 12 carbon atoms, and still more preferably 1 to 8 carbon atoms, and may have a linear, branched or cyclic structure. 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 the alkyl group described later can also be used. Alkyl (meth) acrylate may use only 1 type and may use 2 or more types together.

  Specific examples of alkyl (meth) acrylates 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, etc. Including.

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

  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 acrylates having about 2 to 12 carbon atoms in the alkyl group, such as i-octyl acrylate, 2-ethylhexyl acrylate, n- and i-nonyl acrylate, n- and i-decyl acrylate, and n-dodecyl acrylate . As another specific example of the alkyl acrylate (a1), a substituent-containing alkyl acrylate in which a substituent is introduced into the alkyl group in the alkyl acrylate having an alkyl group having about 2 to 12 carbon atoms can be exemplified. 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.

  Alkyl acrylate (a1) may use only 1 type and may use 2 or more types together. Among them, the alkyl acrylate (a1) preferably contains one or more selected from ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate. From the viewpoint of followability to the optical film 10 of the pressure-sensitive adhesive layer 20 included in the pressure-sensitive adhesive layer optical film 1 and reworkability, the alkyl acrylate (a1) preferably contains n-butyl acrylate.

  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.

  Alkyl acrylate (a2) may use only 1 type and may use 2 or more types together. Among these, from the viewpoint of metal corrosion resistance and durability, the alkyl acrylate (a2) preferably includes methyl acrylate, cyclohexyl acrylate, isobornyl acrylate, and the like, and more preferably includes methyl acrylate.

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

  The (meth) acrylic resin (A) can contain structural units derived from other monomers other than the alkyl acrylates (a1) and (a2). The (meth) acrylic resin (A) may contain only one type of structural unit derived from the other monomer, or may contain two or more types. 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) acrylate 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, (Meth) acrylic acid 2-chloro-2-hydroxypropyl, (meth) acrylic acid 3-chloro-2-hydroxypropyl, monomers having a hydroxy group such as diethylene glycol mono (meth) acrylate; acryloylmorpholine, vinylcaprolactam, N-vinyl-2-pyrrolidone, vinylpyridine, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, glycidyl (meth) acrylate, 2,5-dihydride Monomers 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, dimethylaminopropyl (meth) acrylate, etc. Example: Monomers having a carboxyl group such as (meth) acrylic acid and carboxyethyl (meth) acrylate. Especially, the monomer which has a hydroxyl group is preferable, and the (meth) acrylate which has a hydroxyl group is more preferable at the reactive point of (meth) acrylic-type resin (A) and a crosslinking agent.

  In addition to the (meth) acrylate having a hydroxy group, the above-mentioned monomer having another polar functional group may be included, but the peel strength of the separate film that can be laminated on the outer surface of the pressure-sensitive adhesive layer 20 is increased. From the viewpoint of prevention, it is preferable that the monomer having an amino group is substantially not contained. Moreover, it is preferable that the monomer which has a carboxyl group is not included substantially from a viewpoint of improving the corrosion resistance with respect to ITO. Here, “substantially free” means that it is 0.1 parts by weight or less in 100 parts by weight of all the structural units constituting the (meth) acrylic resin (A).

2) Acrylamide monomer.
For example, N-methylolacrylamide, N- (2-hydroxyethyl) acrylamide, N- (3-hydroxypropyl) acrylamide, N- (4-hydroxybutyl) acrylamide, N- (5-hydroxypentyl) acrylamide, N- ( 6-hydroxyhexyl) acrylamide, N, N-dimethylacrylamide, N, N-diethylacrylamide, N-isopropylacrylamide, N- (3-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) acrylic 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 these, N- (methoxymethyl) acrylamide, N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (butoxymethyl) acrylamide, and N- (2-methylpropoxymethyl) acrylamide are preferably used.

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

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

5) Styrene monomer.
For example, styrene; alkyl styrene such as methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, triethyl styrene, propyl styrene, butyl styrene, hexyl styrene, heptyl styrene, octyl styrene; fluorostyrene, chlorostyrene, bromostyrene, Halogenated styrene such as dibromostyrene and iodostyrene; nitrostyrene; acetylstyrene; methoxystyrene; divinylbenzene and the like.

6) Vinyl monomer.
For example, fatty acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate; vinyl halides such as vinyl chloride and vinyl bromide; vinylidene halides such as vinylidene chloride; vinylpyridine Nitrogen-containing aromatic vinyl such as vinylpyrrolidone and vinylcarbazole; conjugated diene monomers such as butadiene, isoprene and chloroprene; unsaturated nitriles such as acrylonitrile and methacrylonitrile.

7) A monomer 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, tripropylene glycol di (meth) acrylate; molecules such as trimethylolpropane tri (meth) acrylate A monomer having three (meth) acryloyl groups in the inside.

  As described above, the (meth) acrylic resin (A) is a structural unit derived from an alkyl (meth) acrylate from the viewpoint of durability and metal corrosion resistance of the optical film 1 with an adhesive layer and the optical laminate. In addition, it is preferable to include a structural unit derived from a monomer having a polar functional group. The monomer having a polar functional group is preferably a (meth) acrylate monomer having a polar functional group, and more preferably a monomer having a hydroxyl group. 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 0.25-5 weight part, More preferably, it is 0.5-5 weight part.

  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 a methacrylate (methacrylic acid ester) or a methacrylamide monomer. The content of the structural unit is preferably small, and specifically, the content of the structural unit is preferably 10 parts by weight in 100 parts by weight of all the structural units constituting the (meth) acrylic resin (A). It is below, More preferably, it is 5 parts weight or less, It is further more preferable that the said structural unit is not contained substantially (0.1 part weight or less).

  The (meth) acrylic resin (A) preferably has a single peak in the range of a weight average molecular weight Mw of 1,000 to 2,500,000 on the discharge curve in gel permeation chromatography (GPC), and has a Mw of 1,000 to 2,500,000. More preferably, it has a single peak in the range and contains structural units derived from alkyl acrylates (a1) and (a2). The pressure-sensitive adhesive layer 20 having the (meth) acrylic resin (A) as a base polymer is advantageous for enhancing the durability of the optical film 1 with a pressure-sensitive adhesive layer and the optical laminate. When the number of peaks in the Mw range is 2 or more, there is a tendency that sufficient durability cannot be obtained.

  In obtaining the number of peaks of the GPC discharge curve in the range of Mw 1000 to 2.5 million, the discharge curve is acquired according to the GPC measurement conditions described in the section of the 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 1000 to 2.5 million. In the present specification, a peak having an S / N ratio of 30 or more in the GPC emission curve is defined.

  The (meth) acrylic resin (A) preferably has a standard polystyrene equivalent Mw by GPC in the range of 500,000 to 2,500,000, and more preferably in the range of 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. Moreover, the followability of the adhesive layer 20 with respect to the dimensional change of the optical film 10 becomes favorable as Mw is 2.5 million or less. The molecular weight distribution represented by the ratio Mw / Mn between the weight average molecular weight Mw and the number average molecular weight Mn is usually 2 to 10. Mw and Mn of the (meth) acrylic resin (A) are determined according to the GPC measurement conditions described in the Examples section.

  When the (meth) acrylic resin (A) is dissolved in ethyl acetate to give a solution having a concentration of 20% by weight, the viscosity at 25 ° C. is preferably 20 Pa · s or less, preferably 0.1 to 7 Pa · s. It is more preferable that The viscosity in such a range is advantageous for improving the durability of the optical film 1 with an adhesive layer and the optical laminate, and for the reworkability of 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 such a range is advantageous in 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 sum of all (meth) acrylic resins. , Preferably 70% by weight or more, more preferably 80% by weight or more, and further preferably 90% by weight or more. The pressure-sensitive adhesive composition contains only the (meth) acrylic resin (A) as a base polymer. It is particularly preferable to contain it.

  The (meth) acrylic resin (A) and other (meth) acrylic resins that can be used together as necessary are, for example, 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. A polymerization initiator is used about 0.001-5 weight part with respect to a total of 100 weight part of all the monomers used for manufacture of (meth) acrylic-type resin. Moreover, you may manufacture a (meth) acrylic-type resin by the method of advancing superposition | polymerization by active energy rays, such as an ultraviolet-ray, for example.

  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. Examples of the thermal polymerization initiator include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane-1-carbonitrile), 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl-2,2′-azobis (2-methylpropio) Azo), 2,2′-azobis (2-hydroxymethylpropionitrile); lauryl peroxide, t-butyl hydroperoxide, benzoyl peroxide, t-butyl peroxybenzoate, cumene hydroper Oxide, diisopropyl peroxydicarbonate, dipropyl peroxydicarbonate, t-butyl peroxy 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. A redox initiator or the like 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, the solution polymerization method is preferable among the methods shown above. As an example of the solution polymerization method, a monomer and an organic solvent to be used are mixed, a thermal polymerization initiator is added under a nitrogen atmosphere, and the temperature is 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 in a state 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, and methyl isobutyl ketone. Ketones can be used.

[2-2] Isocyanate-based crosslinking agent (B)
The pressure-sensitive adhesive composition can contain an isocyanate-based crosslinking agent (B). By using an isocyanate type crosslinking agent (B) as a crosslinking agent, the metal-corrosion resistance and durability of the optical film 1 with an adhesive layer and an optical laminated body can be improved. An isocyanate type crosslinking agent (B) may be used individually by 1 type, and may use 2 or more types together.

  The isocyanate-based crosslinking agent (B) is a compound having at least two isocyanato groups (—NCO) in the molecule, and specifically, tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated. Examples include xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, and triphenylmethane triisocyanate. The isocyanate-based crosslinking agent (B) is a polyhydric alcohol compound adduct of these isocyanate compounds (for example, adducts of glycerol or trimethylolpropane), isocyanurate, burette type compound, polyether polyol, polyester polyol, acrylic Derivatives such as urethane prepolymer type isocyanate compounds obtained by addition reaction with polyols, polybutadiene polyols, polyisoprene polyols and the like may also be used. Of these, tolylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate or polyhydric alcohol compound adducts of these isocyanate compounds are particularly preferred. From the viewpoint of durability of the optical film 1 with an adhesive layer and an optical laminate, A diisocyanate or a polyhydric alcohol compound adduct thereof is more preferred.

  The content of the isocyanate crosslinking agent (B) is preferably 0.08 to 2.5 parts by weight, more preferably 0.1 to 2 parts per 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 crosslinking agent (B) is within this range, it is advantageous for achieving both 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 use other crosslinking agents such as epoxy compounds, aziridines, metal chelate compounds, peroxides and the like together with the isocyanate-based crosslinking agent (B). From the viewpoints of metal corrosion resistance and durability of the optical laminate, the pressure-sensitive adhesive composition preferably contains only the isocyanate-based crosslinking agent (B) as the crosslinking agent, and is substantially free of peroxide. . Here, “substantially free” means that the content with respect to 100 parts by weight of the (meth) acrylic resin (A) is 0.01 parts by weight or less.

[2-3] Silane compound (C)
The pressure-sensitive adhesive composition can contain a silane compound (C). Thereby, the adhesiveness of the adhesive layer 20, and the metal layer 30, a glass substrate, etc. can be improved. Two or more silane compounds (C) may be used.

  Examples of the silane compound (C) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3 -Glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, Examples include 3-methacryloyloxypropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane.

  The silane compound (C) can include a silicone oligomer type. A specific example of the silicone oligomer is expressed in the form of a combination of monomers as follows.

3-mercaptopropyltrimethoxysilane-tetramethoxysilane oligomer,
3-mercaptopropyltrimethoxysilane-tetraethoxysilane oligomer,
3-mercaptopropyltriethoxysilane-tetramethoxysilane oligomer,
Mercaptopropyl group-containing oligomers such as 3-mercaptopropyltriethoxysilane-tetraethoxysilane oligomers;
Mercaptomethyltrimethoxysilane-tetramethoxysilane oligomer,
Mercaptomethyltrimethoxysilane-tetraethoxysilane oligomer,
Mercaptomethyltriethoxysilane-tetramethoxysilane oligomer,
Mercaptomethyl group-containing oligomers such as mercaptomethyltriethoxysilane-tetraethoxysilane oligomers;
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 oligomers;
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 oligomers;
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.

  Content of the silane compound (C) in an adhesive composition is 0.01-10 weight part normally with respect to 100 weight part of (meth) acrylic-type resin (A), Preferably it is 0.03-5 weight Part, more preferably 0.05 to 2 parts by weight, still more preferably 0.1 to 1 part by weight. When the content of the silane compound (C) is 0.01 parts by weight or more, an effect of improving the adhesion between the pressure-sensitive adhesive layer 20 and the metal layer 30 or the glass substrate is easily obtained. Further, when the content is 10 parts by weight or less, bleeding out of the silane compound (C) from the pressure-sensitive adhesive layer 20 can be suppressed.

[2-4] Ionic compound (D)
The pressure-sensitive adhesive composition contains an ionic compound (D). In one embodiment (first embodiment), the ionic compound (D) has a solubility in 100 g of water at 60 ° C. of 6 g or less. The solubility of the ionic compound (D) is preferably 3 g or less, more preferably 1 g or less, and still more preferably 0.4 g or less. By using the ionic compound (D) having a solubility in 100 g of water at 60 ° C. of 6 g or less, not only can the antistatic performance be imparted to the pressure-sensitive adhesive layer 20, but also excellent metal corrosion resistance and optical properties. Durability can be imparted. The pressure-sensitive adhesive composition can contain one or more ionic compounds (D) having a solubility in 100 g of water at 60 ° C. of 6 g or less.

  The solubility of the ionic compound in 100 g of water at 60 ° C. can be measured as follows. That is, 100 mg of a precisely weighed ionic compound and 2 mL of pure water are mixed and then stored for 24 hours at a temperature of 60 ° C. with stirring. Next, a part of the aqueous layer (precisely weighed) is sampled, and this is dissolved in the mobile phase used for the liquid chromatography analysis described below or the liquid medium constituting the same, and then dissolved in the obtained measurement sample. The weight concentration of the active compound is quantified, and the solubility is determined from the quantified value. Usually, liquid chromatography analysis is used for the determination. Specific measurement conditions can follow the description in the section of Examples described later. However, when quantification by liquid chromatography analysis is difficult, ion chromatography (IC), elemental analysis, ICP emission, electrophoresis or the like may be used.

  The cation of the ionic compound (D) is preferably an organic cation from the viewpoint of the solubility. Specific examples of organic cations are pyridinium cation, imidazolium cation, piperidinium cation, pyrrolidinium cation, tetrahydropyridinium cation, dihydropyridinium cation, tetrahydropyrimidinium cation, dihydropyrimidinium cation, pyrazolium cation, pyra Including zolinium cation, ammonium cation, sulfonium cation, phosphonium cation and the like. The organic cation preferably has a substituent. For example, the solubility of the ionic compound (D) can be controlled by adjusting the carbon number of the substituent. A substituent is a C1-C20 hydrocarbon group which may contain the hetero atom, for example, Preferably, it is a C1-C16 hydrocarbon group which may contain the hetero atom. The hydrocarbon group is, for example, a linear, branched or cyclic alkyl group, preferably a linear or branched alkyl group.

The anion contained in the ionic compound (D) according to the first embodiment may be either an inorganic anion or an organic anion. Specific examples of inorganic anions include chloride anions [Cl ⁻ ], bromide anions [Br ⁻ ], iodide anions [I ⁻ ], tetrachloroaluminate anions [AlCl ₄ ⁻ ], heptachlorodialuminate anions [Al ₂ Cl ₇ ⁻ ], tetrafluoroborate anion [BF ₄ ⁻ ], hexafluorophosphate anion [PF ₆ ⁻ ], perchlorate anion [ClO ₄ ⁻ ], nitrate anion [NO ₃ ⁻ ], hexafluoroarsenate anion [AsF _6] ^- ], Hexafluoroantimonate anion [SbF ₆ ⁻ ], hexafluoro niobate anion [NbF ₆ ⁻ ], hexafluoro tantalate anion [TaF ₆ ⁻ ], bis (fluorosulfonyl) imide anion [(FSO ₂ ) ₂ N ^-], (poly) hydrofluoroether full Ride anion [F (HF) _n ^-] (n is 1-3 or so) and the like.

Specific examples of the organic anion include acetate anion [CH ₃ COO ⁻ ], trifluoroacetate anion [CF ₃ COO ⁻ ], methanesulfonate anion [CH ₃ SO ₃ ⁻ ], trifluoromethanesulfonate anion [CF ₃ SO ₃ ⁻ ], p-toluenesulfonate anion [p-CH ₃ C ₆ H ₄ SO ₃ ⁻ ], bis (trifluoromethanesulfonyl) imide anion [(CF ₃ SO ₂ ) ₂ N ⁻ ], tris (trifluoromethanesulfonyl) methanide anion [( CF ₃ SO ₂ ) ₃ C ⁻ ], dimethyl phosphinate anion [(CH ₃ ) ₂ POO ⁻ ], thiocyan anion [SCN ⁻ ], perfluorobutane sulfonate anion [C ₄ F ₉ SO ₃ ⁻ ], bis (pentafluoro ethanesulfonyl) imide anion _{[(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), dicyanamide anion [( CN) ₂ N ⁻ ] and the following formula (III):

The imide anion etc. which are represented by these are included. Especially, the anion containing a fluorine atom tends to give the ionic compound (D) excellent in antistatic performance, and is preferable. In particular, an ionic compound (D) in which the anion is a bis (trifluoromethanesulfonyl) imide anion, a bis (fluorosulfonyl) imide anion, an imide anion represented by the above formula (III), or a tetrakis (pentafluorophenyl) borate anion Is advantageous in improving the antistatic performance, metal corrosion resistance and optical durability of the optical film 1 with an adhesive layer and the optical laminate. Of these, fluorine atom-containing imide anions such as bis (trifluoromethanesulfonyl) imide anion, bis (fluorosulfonyl) imide anion, and imide anion represented by the above formula ( III ) are preferable, bis (trifluoromethanesulfonyl) imide anion, bis A (fluorosulfonyl) imide anion is more preferable, and a bis (fluorosulfonyl) imide anion is more preferable.

  In another embodiment (second embodiment), the ionic compound (D) is represented by the following formula (I):

It is an ionic compound represented by. In the formula, each of R ¹ and R ² independently represents a hydrogen atom or a hydrocarbon group having 1 to 16 carbon atoms which may contain a hetero atom, and R ³ represents a carbon which may contain a hetero atom. This represents a hydrocarbon group having a number of 4 to 20. X ⁻ represents a fluorine atom-containing imide anion. The hydrocarbon group that can constitute R ¹ , R ² , and R ³ may have a linear, branched, or cyclic structure, and may or may not contain an unsaturated bond.

  By using the ionic compound (D) represented by the above formula (I), not only can the antistatic performance be imparted to the pressure-sensitive adhesive layer 20, but also excellent metal corrosion resistance and optical durability. Can be granted. The pressure-sensitive adhesive composition can contain one or more ionic compounds (D) represented by the above formula (I). The ionic compound (D) represented by the above formula (I) preferably has a solubility in 100 g of water at 60 ° C. of 6 g or less from the viewpoint of metal corrosion resistance and optical durability. The solubility of the ionic compound (D) represented by the above formula (I) is more preferably 3 g or less, further preferably 1 g or less, and particularly preferably 0.4 g or less.

R ¹ and R ² are each independently preferably a hydrogen atom or a linear, branched or cyclic alkyl group having 1 to 16 carbon atoms which may contain a hetero atom. R ³ is preferably a linear or branched alkyl group having 4 to 20 carbon atoms which may contain a hetero atom. R ³ preferably has 4 to 10 carbon atoms, more preferably 4 to 8 carbon atoms, and still more preferably 4 or 5.

  Specific examples of the cation of the ionic compound (D) represented by the above formula (I) include piperidinium cation, pyrrolidinium cation, tetrahydropyridinium cation, dihydropyridinium cation, tetrahydropyrimidinium cation, and dihydropyrimidinium. Including cation, pyrazolium cation, pyrazolinium cation and the like. These cations may have a substituent. A substituent is a C1-C20 hydrocarbon group which may contain the hetero atom, for example, Preferably it is a C1-C16 hydrocarbon group. The hydrocarbon group is, for example, a linear, branched or cyclic alkyl group, preferably a linear or branched alkyl group.

  From the viewpoint of reducing the thickness of the polarizing plate, a configuration in which the resin film is disposed only on one side of the polarizer 2 is advantageous as in the polarizing plate 10a shown in FIG. In this case, the pressure-sensitive adhesive layer 20 is usually directly bonded to the other surface of the polarizer 2 to obtain the pressure-sensitive adhesive layer-attached optical film 1 (see FIG. 4). In the case of a polarizing plate having such a configuration, the problem of reducing the optical performance of the polarizing plate under a high-temperature and high-humidity environment due to the ionic compound contained in the pressure-sensitive adhesive layer 20 becomes particularly significant. According to the pressure-sensitive adhesive composition containing the ionic compound (D) represented (for example, the pressure-sensitive adhesive composition containing the ionic compound (D) having a pyrrolidinium cation), such a polarizing plate is used as an optical film. Even if it is a case where it uses as 10, the optical film 1 with an adhesive layer and optical laminated body which have favorable optical durability (property which can suppress deterioration of an optical characteristic) can be provided.

  In still another embodiment (third embodiment), the ionic compound (D) is represented by the following formula (II):

It is an ionic compound represented by. By using the ionic compound (D) represented by the above formula (II), not only can the antistatic performance be imparted to the pressure-sensitive adhesive layer 20, but also excellent metal corrosion resistance and optical durability. Can be granted. The pressure-sensitive adhesive composition can contain one or more ionic compounds (D) represented by the above formula (II). The ionic compound (D) represented by the above formula (II) preferably has a solubility in 100 g of water at 60 ° C. of 6 g or less from the viewpoint of metal corrosion resistance and optical durability. The solubility of the ionic compound (D) represented by the above formula (II) is more preferably 3 g or less, further preferably 1 g or less, and particularly preferably 0.4 g or less.

In the formula (II), R ⁴ is an alkyl group of straight or branched structure 3-16 carbon atoms, R ⁵ to R ⁹ are each independently a hydrogen atom, which may have a substituent An alkyl group, an optionally substituted alkenyl group, an optionally substituted alkynyl group, an optionally substituted aryl group, and an optionally substituted heterocyclic ring Represents a group, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring. X ⁻ represents the same meaning as X ⁻ in formula (I). The ionic compound (D) represented by the above formula (II) is also a suitable example that can be an ionic compound having a solubility in 100 g of water at 60 ° C. of 6 g or less.

  The alkyl group which may have a substituent is preferably an alkyl group having 1 to 30 carbon atoms, and specific examples thereof include, for example, methyl group, ethyl group, propyl group, butyl group, hexyl group, octyl group, decyl group. Group, dodecyl group, okdadecyl 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 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 9-anthryl. Group, 9-phenanthryl group, 1-pyrenyl group, 5-naphthacenyl group, 1-indenyl group, 2-azurenyl group, 9-fluorenyl group, terphenyl group, quarterphenyl group, o-, m-, and p-tolyl Group, xylyl group, o-, m-, and p-cumenyl group, mesityl group, pentarenyl group, binaphthalenyl group, turnaphthalenyl group, quarternaphthalenyl group, heptaenyl group, biphenylenyl group, indacenyl group, fluoranthenyl group, acenaphthylenyl Group, aseantrirenyl group, phenalenyl group, fluorenyl group, anthryl group, biantraceni 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 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 pyranthrenyl group, and an oberenyl group are included.

  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 or a phosphorus atom is preferable, and specific examples thereof include, for example, thienyl group, benzo [ b] thienyl group, naphtho [2,3-b] thienyl group, thiantenyl group, furyl group, pyranyl group, isobenzofuranyl group, chromenyl group, xanthenyl group, phenoxathiinyl group, 2H-pyrrolyl group, pyrrolyl group Imidazolyl group, pyrazolyl group, pyridyl group, pyrazinyl group, pyrimidinyl group, pyridazinyl group, indolizinyl group, isoindolyl group, 3H-indolyl group, indolyl group, 1H-indazolyl group, purinyl group, 4H-quinolidinyl group, isoquinolyl group, 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, phenalsadinyl 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, quinocridinyl group A thioxanthryl group.

  The alkyl group which may have the above substituent, the alkenyl group which may have a substituent, the alkynyl group which may have a substituent, the aryl group which may have a substituent, and the substituent Specific examples of the substituent capable of substituting the hydrogen atom of the heterocyclic group which may be used include, for example, halogen atoms such as fluorine atom, chlorine atom, bromine atom and iodine atom; methoxy group, ethoxy group, t-butoxy group and the like Alkoxy groups such as phenoxy group, p-tolyloxy group, etc .; alkoxycarbonyl groups such as methoxycarbonyl group, butoxycarbonyl group, phenoxycarbonyl group, vinyloxycarbonyl group, aryloxycarbonyl group; acetoxy group, propionyloxy group , Acyloxy groups such as benzoyloxy group; acetyl group, benzoyl group, isobutyryl group, acryloyl group, Acyl groups such as tacryloyl group and methoxalyl group; alkylsulfanyl groups such as methylsulfanyl group and t-butylsulfanyl group; arylsulfanyl groups such as phenylsulfanyl group and p-tolylsulfanyl group; alkyl such as methylamino group and cyclohexylamino group 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: phenyl group, p-tolyl group, xylyl group, cumenyl group, naphthyl group, anthryl group, phenanthryl group and other aryl groups; hydroxyl group, carboxyl group, sulfonamide group, formyl group, mercapto group, sulfo group, mesyl group Group, p Toluenesulfonyl group, amino group, nitro group, nitroso group, cyano group, trifluoromethyl group, trichloromethyl group, trimethylsilyl group, phosphinico group, phosphono group, alkylsulfonyl group, arylsulfonyl group, trialkylammonium group, dimethylsulfonium Contains a mil group and a triphenylphenacylphosphoniumyl group.

In the N-substituted pyridinium cation possessed by the ionic compound (D) represented by the above formula (II), R ⁴ is a linear or branched alkyl group having 3 to 16 carbon atoms. R ^{5 to} R ⁹ 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 carbon. It is a linear or branched alkyl group having 1 to 20 carbon atoms, and more preferably a hydrogen atom or a linear or branched alkyl group having 1 to 16 carbon atoms.

X ⁻ in the above formulas (I) and (II) represents a fluorine atom-containing imide anion. Use of the ionic compound (D) in which the anion is a fluorine atom-containing imide anion is advantageous in improving the antistatic performance, metal corrosion resistance and optical durability of the optical film 1 with an adhesive layer and the optical laminate. . Of these, fluorine atom-containing imide anions such as bis (trifluoromethanesulfonyl) imide anion, bis (fluorosulfonyl) imide anion, and imide anion represented by the above formula ( III ) are preferable, bis (trifluoromethanesulfonyl) imide anion, bis A (fluorosulfonyl) imide anion is more preferable, and a bis (fluorosulfonyl) imide anion is more preferable.

  Preferable examples of the ionic compound (D) represented by the above formula (I) or (II) include the following formula (IV):

It is an ionic compound represented by. In the above formula (IV), R ⁴ is a linear or branched alkyl group having 3 to 16 carbon atoms, and R ^{5 to} R ⁹ are each independently a hydrogen atom or a linear chain having 1 to 16 carbon atoms. Or it is a branched alkyl group. X ₁ ⁻ is a bis (trifluoromethanesulfonyl) imide anion or a bis (fluorosulfonyl) imide anion.

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

  The pressure-sensitive adhesive composition may be used in combination with the ionic compound (D) according to the first, second and / or third embodiment, and other antistatic agents, but the optical film 1 with a pressure-sensitive adhesive layer and the optical laminate From the viewpoint of metal corrosion resistance of the body, the pressure-sensitive adhesive composition preferably contains only the ionic compound (D) according to the first, second and / or third embodiment as an antistatic agent.

[2-5] Other components The pressure-sensitive adhesive composition comprises a solvent, a crosslinking catalyst, an ultraviolet absorber, a weathering stabilizer, a tackifier, a plasticizer, a softener, a dye, a pigment, an inorganic filler, light scattering fine particles, and the like. 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 an pressure-sensitive adhesive layer, and then cure by irradiating with ultraviolet rays 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 capable of enhancing the metal corrosion resistance of the optical film 1 with a pressure-sensitive adhesive layer and the optical laminate. Examples of rust inhibitors include triazole compounds such as benzotriazole compounds and other triazole compounds; thiazole compounds such as benzothiazole compounds and other thiazole compounds; benzylimidazole compounds and other imidazole compounds. Imidazole compounds; Imidazoline compounds; Quinoline compounds; Pyridine compounds; Pyrimidine compounds; Indole compounds; Amine compounds; Urea compounds; Sodium benzoates; Benzyl mercapto compounds; You can list it.

  However, according to the present invention, since sufficient metal corrosion resistance can be obtained without containing a rust inhibitor, the content of the rust inhibitor 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 inhibitor, and more preferably does not substantially contain a rust inhibitor selected from the above compound group. Here, “substantially free” means that the content with respect to 100 parts by weight of the (meth) acrylic resin (A) is 0.01 parts by weight or less.

[3] Metal layer and substrate The metal layer 30 is made of, for example, aluminum, copper, silver, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead, or an alloy containing two or more metals selected from these. From the viewpoint of electrical conductivity, it is preferably a layer containing a metal element selected from the group consisting of aluminum, copper, silver and gold, and is conductive. From the viewpoint of cost, it is more preferably a layer containing an aluminum element, and further preferably a layer containing an aluminum element as a main component. The inclusion as the main component means that the metal component constituting the metal layer 30 is 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, the optical film 1 with an adhesive layer according to the present invention has particularly good corrosion resistance against a single metal or an alloy. It is preferable that the layer 30 includes a single metal composed of the above metal element and / or an alloy containing two or more of the above metal elements. However, the optical layered body may have a transparent electrode layer made of a metal oxide such as ITO together with such a metal layer 30.

  The form (for example, thickness) 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 deposition method, a sputtering method, an ion plating method, an ink jet printing method, or a gravure printing method. However, it is preferably a metal layer formed by sputtering, ink jet printing, or gravure printing, and more preferably a metal layer formed by sputtering. In the metal layer and metal foil formed by sputtering, the former tends to have poorer corrosion resistance. However, according to the optical laminate according to the present invention, the metal layer formed by sputtering is also good. 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. Furthermore, when the metal layer 30 is a metal wiring layer, the line width of the metal wiring 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 0.5 μm or more. The optical layered body according to the present invention exhibits good metal corrosion resistance even for such a thin metal layer 30 and a metal layer 30 made of fine metal wiring.

  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 the pressure-sensitive adhesive layer 20 is laminated on the patterned metal layer 30, the pressure-sensitive adhesive 20 may have a portion that is not in contact with the metal layer 30. The metal layer 30 may be a continuous film containing the above metal or alloy.

  As shown in FIG. 1, a metal layer 30 that is, for example, a metal wiring layer is usually formed on a substrate 40, and in this case, the optical laminate according to the present invention includes the substrate 40. Formation of the metal layer 30 on the substrate 40 can be performed by sputtering, for example. The substrate 40 can be a transparent substrate constituting a liquid crystal cell included in the touch input element. The substrate 40 is preferably a glass substrate. Examples of the material for the glass substrate include soda lime glass, low alkali glass, non-alkali glass, and the like. 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, such as when the patterned metal layer 30 is formed on the substrate 40, a part of the pressure-sensitive adhesive layer 20 is, for example, a substrate made of glass. 40, but the pressure-sensitive adhesive layer 20 in the optical laminate according to the present invention is also excellent in adhesion to glass. Therefore, the optical laminate and a liquid crystal display device including the same are as follows: 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 an optical film 1 with an adhesive layer and an adhesive layer 20 as shown in FIGS. 4 and 5. 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 1 with an adhesive layer is laminated on the metal layer 30 so that the adhesive layer 20 is in direct contact with the metal layer 30. According to the present invention, corrosion of the metal layer 30 can be effectively suppressed even in the optical layered body configured such that the pressure-sensitive adhesive layer 20 directly contacts the metal layer 30 as described above.

  FIG. 6 is a schematic sectional view showing another example of the layer structure of the optical layered body according to the present invention. In another embodiment, the optical layered body according to the present invention is such that the pressure-sensitive adhesive layer 20 of the pressure-sensitive adhesive layered optical film 1 is formed on the metal layer 30 via the resin layer 50 as in the optical layered body 7 shown in FIG. Are stacked. The pressure-sensitive adhesive layer 20 is in direct contact with the resin layer 50. Also in the optical layered body 7, corrosion of the metal layer 30 can be effectively suppressed. The resin layer 50 disposed between the pressure-sensitive 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. An example when the metal layer 30 is a metal wiring layer is shown in FIG. In the optical laminate shown in FIG. 7, the resin layer 50 may be omitted.

  The optical laminate includes, for example, an optical film 1 with an adhesive layer including an optical film 10 and an adhesive layer 20 laminated on at least one surface of the metal layer 30 formed on the substrate 40. Can be produced by bonding through the pressure-sensitive adhesive layer 20.

  As described above, the optical film 1 with the pressure-sensitive adhesive layer includes the optical film 10 and the pressure-sensitive adhesive layer 20 laminated on at least one surface thereof (FIG. 1). The adhesive layer 20 may be laminated on both surfaces 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, or surface activation treatment, for example, plasma treatment, It is preferable to perform a corona treatment or the like, and it is more preferable to perform a corona treatment.

  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 on the polarizer surface, that is, 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 the outer surface of either the first or second resin film 3, 4. May be laminated.

  An antistatic layer may be separately provided between the optical film 10 and the pressure-sensitive adhesive layer 20, but the pressure-sensitive adhesive layer 20 of the present invention can provide excellent antistatic properties by the pressure-sensitive adhesive layer alone, so that It is preferable not to have an antistatic layer between the optical film 10 and the pressure-sensitive adhesive layer 20 from the viewpoint of thinning the laminate and simplifying the laminate production process.

  The optical film 1 with an adhesive layer may include a separate film (release film) laminated on the outer surface of the adhesive layer 20. This separate film is usually peeled and removed when the pressure-sensitive adhesive layer 20 is used (for example, when laminated on the metal layer 30). The separate film is, for example, one having a release treatment such as silicone treatment applied to the surface on which the pressure-sensitive adhesive layer 20 of a film made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyarate is formed. Can do.

  The optical film 1 with the pressure-sensitive adhesive layer is obtained by dissolving or dispersing each component constituting the pressure-sensitive adhesive composition in a solvent to obtain a solvent-containing pressure-sensitive adhesive composition, and then applying and drying this onto the surface of the optical film 10. And can be obtained by forming the pressure-sensitive adhesive layer 20. Moreover, the optical film 1 with an adhesive layer forms the adhesive layer 20 on the mold release process surface of a separate film like above, and laminates | transfers this adhesive layer 20 on the surface of the optical film 10 (transfer). Can also be obtained.

  An optical laminated body can be obtained by bonding the optical film 1 with an adhesive layer through the adhesive layer 20 on the metal layer 30 (or the resin layer). After the optical film 1 with the pressure-sensitive adhesive layer 1 and the metal layer 30 are pasted to produce an optical laminate, the optical film 1 with the pressure-sensitive adhesive layer 1 is peeled off from the metal layer 30 in the case of any problems. A so-called reworking operation may be required in which the optical film 1 with an adhesive layer is reattached to the metal layer 30. The optical layered body according to the present invention is excellent in reworkability because fogging, adhesive residue and the like hardly occur on the surface of the metal layer 30 after the optical film 1 with the pressure-sensitive adhesive layer is peeled from the metal layer 30. According to the optical layered body of the present invention, good reworkability can be exhibited even when the surface on which the pressure-sensitive adhesive layer 20 is bonded is not the metal layer 30 but a glass substrate or ITO layer.

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

  The liquid crystal display device according to the present invention is preferably a touch input type liquid crystal display device having a touch panel function. 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 method such as an out-cell type, an on-cell type, an in-cell type, and the operation method of the touch panel is a resistive film type, a capacitive type (surface type capacitive type, projection type) Any 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. 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 layered body can be a substrate (typically a glass substrate) included in the liquid crystal cell.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated further more concretely, this invention is not limited by these examples. Hereinafter, the parts and% representing the amount used and the content are based on weight 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 the 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 resulting solution was charged. After the air in the reaction vessel was replaced with nitrogen gas, the internal temperature was set to 60 ° C. Thereafter, a solution in which 0.12 part of azobisisobutyronitrile was dissolved 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 was continuously introduced into the reaction vessel at an addition rate of 17.3 parts / hr so that the polymer concentration was approximately 35%. Added. After maintaining the internal temperature at 54 to 56 ° C. until 12 hours have elapsed from the start of addition of ethyl acetate, ethyl acetate was added to adjust the polymer concentration to 20%, and (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 between the weight average molecular weight Mw and the number average molecular weight Mn was 5.32. In the gel permeation chromatography (GPC) discharge curve, the component of Mw 1.39 million showed a single peak, and no other peak was observed in the range of Mw 1000 to 2.5 million.

<Production Example 2: Production of (meth) acrylic resin (A-2) for pressure-sensitive adhesive layer>
An ethyl acetate solution of (meth) acrylic resin (A-2) was obtained in the same manner as in Production Example 1 except that the monomer composition was as shown in Table 1 (resin concentration: 20% ). The (meth) acrylic resin (A-2) had a weight average molecular weight Mw of 141,000 and Mw / Mn of 4.71. In the GPC emission curve, the component having Mw of 141,000 showed a single peak, and no other peak was observed in the range of Mw of 1,000 to 2,500,000.

<Production Example 3: Production of (meth) acrylic resin (A-3) for pressure-sensitive adhesive layer>
An ethyl acetate solution of (meth) acrylic resin (A-3) was obtained in the same manner as in Production Example 1 except that the monomer composition was as shown in Table 1 (resin concentration: 20%). ). The (meth) acrylic resin (A-3) had a weight average molecular weight Mw of 750,000 and Mw / Mn of 5.02. In the GPC emission curve, the component of Mw 750,000 showed a single peak, and no other peak was observed in the range of Mw 1000 to 2.5 million.

  In the above production example, the weight average molecular weight Mw and the number average molecular weight Mn are 4 columns of “TSKgel XL” manufactured by Tosoh Corporation and “Shodex GPC KF-” manufactured by Showa Denko KK as a column in the GPC apparatus. 802 "is connected in series, a total of five are connected in series, tetrahydrofuran is used as the eluent, sample concentration is 5mg / mL, sample introduction amount is 100μL, temperature is 40 ° C, flow rate is 1mL / min. It was measured by. The conditions for obtaining the GPC emission curve were also the same.

  The glass transition temperature Tg is measured using a differential scanning calorimeter (DSC) “EXSTAR DSC6000” manufactured by SII Nano Technology Co., Ltd., under a nitrogen atmosphere, a measurement temperature range of −80 to 50 ° C., and a heating rate of 10 ° C./min. Measured under 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 (indicated as “GPC peak number” in Table 1) Are summarized in Table 1.

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.),
2EHA: 2-ethylhexyl acrylate (glass transition temperature of homopolymer: −50 ° C.),
HEA: 2-hydroxyethyl acrylate,
AM: acrylamide,
M-90G: Methoxypolyethylene glycol # 400 methacrylate (EO 9 mol), trade name “M-90G” obtained from Shin-Nakamura Chemical Co., Ltd.

<Examples 1 to 9, Comparative Example 1>
(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 isocyanate cross-linking agent (B), silane compound (C), and ionic compound (D) are mixed in the amounts (parts by weight) shown in Table 2, and ethyl acetate is added so that the solid content concentration becomes 14%. Thus, a pressure-sensitive adhesive composition was obtained. The compounding amount of each compounding component shown in Table 2 is the number of parts by weight as an active ingredient contained therein when the product used contains a solvent or the like.

The details of each compounding component shown in abbreviations in Table 2 are as follows.
(Isocyanate-based crosslinking agent)
B-1: Ethyl acetate solution (solid content concentration 75%) of trimethylolpropane adduct of xylylene diisocyanate, trade name “Takenate D-110N” obtained from Mitsui Chemicals, Inc.

(Silane compound)
C-1: 3-glycidoxypropyltrimethoxysilane, trade name “KBM403” obtained from Shin-Etsu Chemical Co., Ltd.

(Ionic compound)
D-1: N-propylpyridinium bis (fluorosulfonyl) imide,
D-2: N-octylpyridinium bis (fluorosulfonyl) imide,
D-3: N-decylpyridinium bis (fluorosulfonyl) imide,
D-4: N-dodecylpyridinium bis (fluorosulfonyl) imide,
D-5: N-hexadecylpyridinium bis (fluorosulfonyl) imide,
D-6: 1-ethyl-1-methylpyrrolidinium bis (trifluoromethanesulfonyl) imide,
D-7: N-methylpyridinium bis (fluorosulfonyl) imide.

  “Solubility” in Table 2 is the solubility (g) of the ionic compound (D) in 100 g of water at 60 ° C. The solubility was determined according to the following procedure. First, 100 mg of a precisely weighed ionic compound and 2 mL of pure water were mixed and then stored for 24 hours at a temperature of 60 ° C. with stirring. When the obtained ionic compound contained a solvent, the solvent was removed by distillation under reduced pressure to obtain a dry ionic compound, which was precisely weighed. Next, a part of the aqueous layer (precisely weighed) was sampled, and this was appropriately diluted with acetonitrile, and then the weight concentration of the ionic compound dissolved in the obtained measurement sample was determined by liquid chromatography mass spectrometry (LC / MS) was quantified by the absolute calibration curve method. The measurement conditions of LC / MS are as follows. Based on the quantification results, the solubility of the ionic compound (D) was determined.

Analyzer: Agilent Technologies LC / MS instrument
1260/6130 separation column: Kinetex 2.6u C18 100A (3.0 × 100mm, 2.7μm)
Mobile phase: 0.05% TFA addition Water / acetonitrile mixed solvent gradient Mobile phase flow rate: 0.5 mL / min.
Sample injection volume: 2.5 μL
Oven temperature: 40 ℃
UV detection wavelength: 254 nm
MS detection conditions: Electrospray ionization (ESI) method
Positive.

  The ionic compounds D-1 to D-5 and D-7 are quantified by the UV detector (wavelength 254 nm), and the ionic compound D-6 is quantified by the selected ion detection (SIM) mode of the MS detector. (Monitoring mass m / z = 114).

(2) Production of pressure-sensitive adhesive layer Each pressure-sensitive adhesive composition prepared in the above (1) was separated from a polyethylene terephthalate film subjected to a release treatment [trade name “PLR-382051 obtained from Lintec Corporation]. ]] 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) Production of optical film with pressure-sensitive adhesive layer (P-1) Polyvinyl alcohol film having an average degree of polymerization of about 2400, a saponification degree of 99.9 mol%, and a thickness of 60 μm [trade name “Kuraray Vinylon VF manufactured by Kuraray Co., Ltd.” -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). Soaked at 30 ° C. Then, it was immersed at 56.5 ° C. in an aqueous solution containing potassium iodide and boric acid (potassium iodide / boric acid / water (weight ratio) = 12 / 3.6 / 100). 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 on polyvinyl alcohol. Stretching was mainly performed in the iodine staining and boric acid treatment steps, and the total stretching ratio was 5.3 times.

  A transparent protective film [trade name “KC2UA” manufactured by Konica Minolta Opto Co., Ltd.] made of a 25 μm-thick triacetyl cellulose film is placed on one side of the obtained polarizer with an adhesive made of an aqueous solution of a polyvinyl alcohol resin. And pasted. Next, a zero retardation film [trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.] made of a cyclic polyolefin resin having a thickness of 23 μm is formed on the surface opposite to the triacetyl cellulose film in the polarizer. A bonded polarizing plate was produced through an adhesive made of an aqueous resin solution. Next, after the corona discharge treatment for improving adhesion is performed on the surface of the zero retardation film opposite to the surface in contact with the polarizer, it is opposite to the separate film of the pressure-sensitive adhesive layer prepared in (2) above. After laminating the side surface (the pressure-sensitive adhesive layer surface) with a laminator, the film was cured for 7 days under the conditions of 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) Production of optical film with pressure-sensitive adhesive layer (P-2) Polyvinyl alcohol film having an average polymerization degree of about 2400, a saponification degree of 99.9 mol%, and a thickness of 30 μm [trade name “Kuraray Vinylon VF manufactured by Kuraray Co., Ltd.” -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). Soaked at 30 ° C. Then, it was immersed at 56.5 ° C. in an aqueous solution containing potassium iodide and boric acid (potassium iodide / boric acid / water (weight ratio) = 12 / 3.6 / 100). 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 on polyvinyl alcohol. Stretching was mainly performed in the iodine staining and boric acid treatment steps, and the total stretching ratio was 5.3 times.

  A transparent protective film [trade name “KC2UA” manufactured by Konica Minolta Opto Co., Ltd.] made of a 25 μm-thick triacetyl cellulose film is placed on one side of the obtained polarizer with an adhesive made of an aqueous solution of a polyvinyl alcohol resin. To form a polarizing plate. Subsequently, the surface opposite to the separate film of the pressure-sensitive adhesive layer prepared in the above (2) (pressure-sensitive adhesive layer surface) was bonded to the surface opposite to the surface where the protective film of the polarizer was bonded using a laminator. Thereafter, the film was cured for 7 days under the conditions of a temperature of 23 ° C. and a relative humidity of 65% to obtain an optical film with a pressure-sensitive adhesive layer (P-2).

(5) Evaluation of metal corrosion resistance of optical film with pressure-sensitive adhesive layer The optical film with pressure-sensitive adhesive layer (P-1) prepared in (3) above was cut into a test piece having a size of 20 mm × 50 mm, and a metal layer It stuck to the metal layer side of the attached glass substrate through the adhesive layer. As the glass substrate with a metal layer, a glass substrate (manufactured by Geomat Co., Ltd.) in which a metal aluminum layer having a thickness of about 500 nm was laminated on the alkali-free glass surface by sputtering. The obtained optical layered body was stored in an oven at a temperature of 60 ° C. and a relative humidity of 90% for 500 hours, and then the state of the metal layer where the optical film with the pressure-sensitive adhesive layer was adhered was observed. It was evaluated with. The results are shown in Table 3.

4: The number of pitting corrosion generated on the surface of the metal layer is 2 or less,
3: The number of pitting corrosion generated on the surface of the metal layer is 3 to 5.
2: The number of pitting corrosion generated on the surface of the metal layer is 6 or more.
1: Numerous pitting corrosion has occurred on the entire surface of the metal layer, and white turbidity has also occurred.

(6) Durability evaluation of optical film with pressure-sensitive adhesive layer The optical film with pressure-sensitive adhesive layer (P-1) prepared in (3) above is 200 mm × 150 mm so that the stretching axis direction of the polarizing plate is the long side. It cut | judged to the magnitude | size, the separate film was peeled, and the exposed adhesive layer surface was bonded to the glass substrate. The test piece (the optical film with the pressure-sensitive adhesive layer to which the glass substrate was attached) obtained by attaching the obtained glass substrate 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 for the glass substrate. About the obtained optical laminated body, the following 3 types of durability tests were implemented.

[Durability test]
A heat resistance test that is maintained for 750 hours under dry conditions at a temperature of 85 ° C
-Moisture and heat resistance test held for 750 hours in an environment of temperature 60 ° C and relative humidity 90%,
A heat shock resistance (HS) test in which an operation of holding for 30 minutes under a drying condition at a temperature of 85 ° C. and then holding for 30 minutes under a drying condition at a temperature of −40 ° C. is one cycle, and this is repeated for 400 cycles.

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

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, foaming, etc. are noticeable.

(7) Reworkability evaluation 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 × 150 mm. The separator was peeled off from the test piece, and the pressure-sensitive adhesive surface was attached to a glass substrate. The test piece (the optical film with the pressure-sensitive adhesive layer to which the glass substrate was attached) obtained by attaching the obtained glass substrate 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. Further, in an atmosphere at a temperature of 23 ° C. and a relative humidity of 50%, the optical film is peeled off from the test piece together with the adhesive layer in a 180 ° direction at a speed of 300 mm / min. did. The state of the glass substrate surface after peeling was observed and evaluated according to the following criteria. The results are shown in Table 3.

4: No fogging or the like is observed on the surface of the glass substrate.
3: Almost no fogging is observed on the surface of the glass substrate.
2: Cloudiness etc. are recognized on the surface of the glass substrate,
1: The remainder of an adhesive layer is recognized on the surface of a glass substrate.

  DESCRIPTION OF SYMBOLS 1 Optical film with an adhesive layer, 2 Polarizer, 3 1st resin film, 4 2nd resin film, 5, 6, 7 Optical laminated body, 10 Optical film, 10a, 10b Polarizing plate, 20 Adhesive layer, 30 Metal Layer, 40 substrate, 50 resin layer.

Claims (15)

An optical film, a pressure-sensitive adhesive layer, and a metal layer containing an aluminum element are included in this order,
The pressure-sensitive adhesive layer is composed of a (meth) acrylic resin and an ionic compound having a solubility in 100 g of water at 60 ° C. of 0.76 g or less (excluding an ionic compound in which the cation is a cation having an ammonium skeleton). .)
The (meth) acrylic resin is derived from an alkyl acrylate (a1) derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0 ° C, and derived from an alkyl acrylate (a2) derived from a homopolymer having a glass transition temperature of 0 ° C or higher. Containing structural units of
The alkyl acrylate (a1) contains n-butyl acrylate,
The alkyl acrylate (a2) contains methyl acrylate,
In the (meth) acrylic resin, the content of the structural unit derived from the alkyl acrylate (a2) is 10 parts by weight or more in 100 parts by weight of all the structural units constituting the (meth) acrylic resin.
The optical layered body, wherein the metal layer is a metal wiring layer.   The optical laminate according to claim 1, wherein the metal wiring layer has a metal wiring having a line width of 10 μm or less.   The optical layered body according to claim 1 or 2, wherein the metal layer has a thickness of 3 µm or less.   The optical layered body according to claim 1, wherein the metal layer is a layer formed by sputtering. An optical film, a pressure-sensitive adhesive layer, and a metal layer containing an aluminum element are included in this order,
The pressure-sensitive adhesive layer is composed of a (meth) acrylic resin and an ionic compound having a solubility in 100 g of water at 60 ° C. of 0.76 g or less (excluding an ionic compound in which the cation is a cation having an ammonium skeleton). .)
The (meth) acrylic resin is derived from an alkyl acrylate (a1) derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0 ° C, and derived from an alkyl acrylate (a2) derived from a homopolymer having a glass transition temperature of 0 ° C or higher. Containing structural units of
The alkyl acrylate (a1) contains n-butyl acrylate,
The alkyl acrylate (a2) contains methyl acrylate,
In the (meth) acrylic resin, the content of the structural unit derived from the alkyl acrylate (a2) is 10 parts by weight or more in 100 parts by weight of all the structural units constituting the (meth) acrylic resin.
The said metal layer is an optical laminated body whose thickness is 3 micrometers or less.   The optical laminate according to claim 5, wherein the metal layer is a layer formed by sputtering. An optical film, a pressure-sensitive adhesive layer, and a metal layer containing an aluminum element are included in this order,
The pressure-sensitive adhesive layer is composed of a (meth) acrylic resin and an ionic compound having a solubility in 100 g of water at 60 ° C. of 0.76 g or less (excluding an ionic compound in which the cation is a cation having an ammonium skeleton). .)
The (meth) acrylic resin is derived from an alkyl acrylate (a1) derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0 ° C, and derived from an alkyl acrylate (a2) derived from a homopolymer having a glass transition temperature of 0 ° C or higher. Containing structural units of
The alkyl acrylate (a1) contains n-butyl acrylate,
The alkyl acrylate (a2) includes methyl acrylate,
In the (meth) acrylic resin, the content of the structural unit derived from the alkyl acrylate (a2) is 10 parts by weight or more in 100 parts by weight of all the structural units constituting the (meth) acrylic resin.
The optical layered body, wherein the metal layer is a layer formed by sputtering.   The optical layered product according to any one of claims 1 to 7, wherein the anion of the ionic compound is a fluorine atom-containing imide anion. The optical laminated body of any one of Claims 1-8 whose said metal layer is an electrode layer. Wherein the metal layer is a metal wiring layer of the touch input device, the optical laminate according to any one of claims 1-8. The optical film, polarizer, retardation film, a brightness enhancement film, an antiglare film, antireflection film, a diffusion film, condensing film, a polarizing plate, or a retardation plate, any one of the claims 1-10 The optical laminate according to Item. To any one of claims 1 to 11 comprising the optical laminate according, the liquid crystal display device. A (meth) acrylic resin and an ionic compound (excluding an ionic compound in which the cation is a cation having an ammonium skeleton) ;
The ionic compound has a solubility in 100 g of water at 60 ° C. of 0.76 g or less,
The (meth) acrylic resin is derived from an alkyl acrylate (a1) derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0 ° C, and derived from an alkyl acrylate (a2) derived from a homopolymer having a glass transition temperature of 0 ° C or higher. Containing structural units of
The alkyl acrylate (a1) contains n-butyl acrylate,
The alkyl acrylate (a2) contains methyl acrylate,
In the (meth) acrylic resin, the content of the structural unit derived from the alkyl acrylate (a2) is 10 parts by weight or more in 100 parts by weight of all the structural units constituting the (meth) acrylic resin.
Used to form an adhesive layer for laminating an optical film on a metal layer containing an aluminum element,
The pressure-sensitive adhesive composition, wherein the metal layer is a metal wiring layer. A (meth) acrylic resin and an ionic compound (excluding an ionic compound in which the cation is a cation having an ammonium skeleton) ;
The ionic compound has a solubility in 100 g of water at 60 ° C. of 0.76 g or less,
The (meth) acrylic resin is derived from an alkyl acrylate (a1) derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0 ° C, and derived from an alkyl acrylate (a2) derived from a homopolymer having a glass transition temperature of 0 ° C or higher. Containing structural units of
The alkyl acrylate (a1) contains n-butyl acrylate,
The alkyl acrylate (a2) contains methyl acrylate,
In the (meth) acrylic resin, the content of the structural unit derived from the alkyl acrylate (a2) is 10 parts by weight or more in 100 parts by weight of all the structural units constituting the (meth) acrylic resin.
Used to form an adhesive layer for laminating an optical film on a metal layer containing an aluminum element,
The said metal layer is an adhesive composition whose thickness is 3 micrometers or less. A (meth) acrylic resin and an ionic compound (excluding an ionic compound in which the cation is a cation having an ammonium skeleton) ;
The ionic compound has a solubility in 100 g of water at 60 ° C. of 0.76 g or less,
The (meth) acrylic resin is derived from an alkyl acrylate (a1) derived from an alkyl acrylate (a1) having a homopolymer glass transition temperature of less than 0 ° C, and derived from an alkyl acrylate (a2) derived from a homopolymer having a glass transition temperature of 0 ° C or higher. Containing structural units of
The alkyl acrylate (a1) contains n-butyl acrylate,
The alkyl acrylate (a2) contains methyl acrylate,
In the (meth) acrylic resin, the content of the structural unit derived from the alkyl acrylate (a2) is 10 parts by weight or more in 100 parts by weight of all the structural units constituting the (meth) acrylic resin.
Used to form an adhesive layer for laminating an optical film on a metal layer containing an aluminum element,
The pressure-sensitive adhesive composition, wherein the metal layer is a layer formed by sputtering.

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