TW201702063A - Optical laminate and liquid crystal display device - Google Patents

Abstract

The present invention provides an optical laminate comprising an optical film, an adhesive layer and a metal layer in this order, the metal layer being a metal wiring layer, a layer formed by sputtering, or a metal layer having a thickness equal to or less than 3 [mu]m, the adhesive layer comprising an ionic compound having a solubility equal to or less than 6g with respect to 100g of water in 60 DEG C. The present invention also provides an optical laminate comprising an optical film, an adhesive layer and a metal layer in this order, the adhesive layer comprising an ionic compound represented by formula (I) or formula (II), as well as a liquid crystal display device including the same.

Description

Optical laminate and liquid crystal display device

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

An optical film represented by a polarizing plate in which a transparent resin film is bonded to a single surface or a double-area layer of a polarizing plate is widely used as an optical member constituting an image display device such as a liquid crystal display device. The optical film of the polarizing plate is often used by being bonded to another member (for example, a liquid crystal cell in a liquid crystal display device) through an adhesive layer (for example, see JP-A-2010-229321). Therefore, in the case of an optical film, an optical film in which an adhesive layer of an adhesive layer is provided in advance is known. Further, in order to impart antistatic properties, it is also known that the adhesive layer contains an ionic compound.

In recent years, liquid crystal display devices have been extended to portable mobile phones with touch panel functions represented by smart phones or desktop terminals and car navigation systems. The optical film with an adhesive layer in such a touch input type liquid crystal display device is also constructed, for example, by metal wiring. The metal layer is disposed such that the adhesive layer is disposed through, for example, a resin layer or in direct contact. However, in the configuration in which a metal layer composed of a metal material and an adhesive layer containing an ionic compound are combined, the metal layer may be corroded in a high-temperature and high-humidity environment. In the case of corrosion, when the thickness of the pitting metal layer is thin, or when the metal layer is metal wiring, the line width is narrow, and the metal layer is completely penetrated, which is particularly problematic.

An object of the present invention is to provide an optical layered body and a liquid crystal display device comprising the same, which can deposit an optical film with an adhesive layer on a metal layer such as a metal wiring layer, and can suppress corrosion of the metal layer. Optical laminate.

The present invention provides an optical layered body as shown below, a liquid crystal display device including the optical layered body, and an adhesive composition.

[1] An optical laminate comprising an optical film, an adhesive layer and a metal layer in sequence. The pressure-sensitive adhesive layer contains an ionic compound having a solubility of 100 g or less per 100 g of water at 60 ° C.

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

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

[5] An optical layered body comprising an optical film, an adhesive layer and a metal layer in this order, wherein the adhesive layer comprises an ionic compound represented by the following formula (I):

(wherein 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 represents a hydrocarbon group having 4 to 20 carbon atoms which may contain a hetero atom, and X ^- represents An imine anion of a fluorine atom).

[6] The optical layered product according to [5], wherein the R ³ series carbon number of the above formula (I) is 4 or 5.

[7] An optical layered body comprising an optical film, an adhesive layer and a metal layer in this order, wherein the adhesive layer contains an ionic compound represented by the following formula (II):

(wherein R ⁴ represents an alkyl group having a linear or branched structure of 3 to 16 carbon atoms, and R ⁵ to R ⁹ each independently represent a hydrogen atom, an alkyl group which may have a substituent, and may have a substituent. An alkenyl group, an alkynyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring with each other , X ^- means the same meaning as described above).

[8] The optical layered product according to [7], wherein R ⁵ to R ⁹ of the above formula (II) each independently represent a hydrogen atom or a linear or branched structure having a carbon number of 1 to 16. alkyl.

The optical layered body according to any one of the above aspects, wherein the X ^- based bis(fluorosulfonyl)imide anion or bis(trifluoromethanesulfonyl) Amine anion.

[10] The optical layered product according to any one of [5] to [8] wherein the X ^- based bis(fluorosulfonyl)imide anion.

[11] The optical layered product according to any one of [1], wherein the adhesive layer further contains a (meth)acrylic resin. The (meth)acrylic resin contains a constituent unit derived from an alkyl acrylate (a1) having a glass transition temperature of less than 0 ° C derived from a homopolymer, and an acrylic acid having a glass transition temperature of 0 ° C or higher derived from a homopolymer. a constituent unit of the alkyl ester (a2).

The optical layered product according to the above-mentioned (meth)acrylic resin, wherein the content of the constituent unit derived from the alkyl acrylate (a2) is constituting the (meth)acrylic resin. 10 parts by weight or more of 100 parts by weight of the total constituent unit.

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

[14] The optical layered body according to any one of [1] to [13] wherein the metal layer contains aluminum, copper, silver, iron, tin, zinc, nickel, molybdenum, chromium, tungsten One or more of the group consisting of lead and an alloy containing two or more kinds of metals selected from these.

[15] The optical according to any one of [1] to [14] A laminate in which the aforementioned metal layer contains 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.

The optical layered body according to any one of the aspects of the present invention, wherein the metal layer has a thickness of 3 μm or less.

[18] A liquid crystal display device comprising the optical layered body according to any one of [1] to [17].

[19] An adhesive composition comprising a (meth)acrylic resin and an ionic compound and used for forming an adhesive layer to be laminated on a metal layer.

The ionic compound is one in which the solubility in 100 g of water at 60 ° C is 6 g or less.

[20] An adhesive composition comprising a (meth)acrylic resin and an ionic compound and used for forming an adhesive layer to be laminated on a metal layer.

The ionic compound is an ionic compound represented by the following formula (I):

(wherein 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 represents a hydrocarbon group having 4 to 20 carbon atoms which may contain a hetero atom, X ^- Indicates an imine anion containing a fluorine atom).

[21] An adhesive composition comprising a (meth)acrylic resin and an ionic compound and used for forming an adhesive layer to be laminated on a metal layer.

The ionic compound is an ionic compound represented by the following formula (II):

(wherein R ⁴ represents an alkyl group having a linear or branched structure of 3 to 16 carbon atoms, and R ⁵ to R ⁹ each independently represent a hydrogen atom, an alkyl group which may have a substituent, and may have a substituent. An alkenyl group, an alkynyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring with each other The X ^- line means the same meaning as described above).

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

1‧‧‧Optical film with adhesive layer

2‧‧‧ polarizer

3‧‧‧1st resin film

4‧‧‧2nd resin film

5, 6, 7‧‧‧ Optical laminates

10‧‧‧Optical film

10a, 10b‧‧‧ polarizing plate

20‧‧‧Adhesive layer

30‧‧‧metal layer

40‧‧‧Substrate

50‧‧‧ resin layer

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

Fig. 2 is a schematic cross-sectional view showing an example of a layer configuration of a polarizing plate.

Fig. 3 is a schematic cross-sectional view showing another example of the layer configuration of the polarizing plate Figure.

Fig. 4 is a schematic cross-sectional view showing an example of a layer configuration of an optical layered body.

Fig. 5 is a schematic cross-sectional view showing another example of the layer configuration of the optical layered body.

Fig. 6 is a schematic cross-sectional view showing another example of the layer configuration of the optical layered body.

Fig. 7 is a schematic cross-sectional view showing another example of the layer constitution of the optical layered body.

<Optical laminate>

Fig. 1 is a schematic cross-sectional view showing an example of an optical layered body of the present invention. As shown in Fig. 1, the optical layering system of the present invention sequentially includes the optical film 10, the adhesive layer 20, and the metal layer 30, and may further include a substrate. The optical layering system can be formed by adhering the optical film 1 with an adhesive layer to the metal layer 30 formed on the substrate 40 through the adhesive layer 20, and the optical film 1 of the adhesive layer comprises an optical film. 10. An adhesive layer 20 laminated on at least one side thereof.

The adhesive layer 20 is usually laminated directly on the surface of the optical film 10. Further, in general, the optical film 1 with the adhesive layer is laminated on the metal layer 30 such that the adhesive layer 20 directly contacts the metal layer 30. According to the present invention, in such an optical layered body, corrosion of the metal layer 30 can be effectively suppressed. Hereinafter, the property of suppressing corrosion of the metal layer 30 is also referred to as "Corrosion resistance to metals".

The optical film 10 may be an optical film of a single layer structure or an optical film of a multilayer structure. The adhesive layer 20 is composed of an adhesive composition containing a predetermined ionic compound (D). The adhesive composition usually further contains a (meth)acrylic resin (A), and may further contain an isocyanate crosslinking agent (B) and/or a decane compound (C). The adhesive composition may further comprise other ingredients. In the present specification, "(meth)acrylonitrile" means at least one selected from the group consisting of acrylic acid and methacrylic acid. The same applies to "(meth) acrylate" or "(meth) acryl thiol".

[1] optical film

The optical film 10 of the optical layered product of the present invention constitutes an optical member of the optical film 1 with an adhesive layer, and can be various optical films (films having optical characteristics) incorporated in an image display device such as a liquid crystal display device. The optical film 10 may be an optical film of a single layer structure or an optical film of a multilayer structure. Specific examples of the optical film having a single-layer structure include an optical functional film such as a retardation film, a brightness enhancement film, an anti-glare film, an anti-reflection film, a diffusion film, and a light-concentrating film, in addition to the polarizer. Specific examples of the multilayer optical film include a polarizing plate and a phase difference plate. The polarizing plate in the present specification refers to a resin film or a resin layer of at least one area of the polarizing plate. The phase difference plate refers to a resin film or a resin layer of at least one area of the retardation film. The optical film 10 is preferably a polarizing plate, a polarizing plate, a phase difference plate or a retardation film, and more preferably a polarizing plate or a polarizing plate.

[1-1] Polarizer

2 and 3 are schematic cross-sectional views showing an example of a layer configuration of a 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 bonded to one area of the polarizing plate 2, and the polarizing plate 10b shown in Fig. 3 is laminated on the other side of the polarizing plate 2. The double-sided protective polarizing plate to which the second resin film 4 is bonded is bonded. The first and second resin films 3 and 4 are bonded to the polarizer 2 through an adhesive layer or an adhesive layer (not shown). The polarizing plates 10a and 10b may include other films or layers other than the first and second resin films 3 and 4.

Examples of the layer configuration of the optical layered body 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 layered body 5 shown in Fig. 4 is an example in which the polarizing plate 10a shown in Fig. 2 is used as the optical film 10. The optical layered body 6 shown in Fig. 5 is formed by using the polarizing plate 10b shown in Fig. 3 as the optical layered body 10b. An example of the optical film 10.

The polarizer 2 is a film having a linear polarized light having a vibration plane parallel to the absorption axis thereof, and a linearly polarized light having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis); for example, it can be used for The polyvinyl alcohol-based resin film adsorbs a film of a dichroic dye. As the dichroic dye system, iodine or a dichroic organic dye can be used.

The polyvinyl alcohol-based resin can be obtained by saponifying a polyvinyl acetate-based resin. The polyvinyl acetate-based resin may be, for example, a polyvinyl acetate which is a homopolymer of vinyl acetate, and may, for example, be a copolymer of a monomer copolymerizable with vinyl acetate and vinyl acetate. The single system which can be copolymerized with vinyl acetate may, for example, be an unsaturated carboxylic acid, an olefin, a vinyl ether, an unsaturated sulfonic acid, a (meth) acrylamide having an ammonium group, or the like.

The degree of saponification of the polyvinyl alcohol-based resin is usually from 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formaldehyde or polyvinyl acetaldehyde modified with an aldehyde may be used. The average degree of polymerization of the polyvinyl alcohol-based resin is usually from 1,000 to 10,000, preferably from 1,500 to 5,000. The average degree of polymerization of the polyvinyl alcohol-based resin can be determined in accordance with JIS K6726.

Usually, a film made of a polyvinyl alcohol-based resin is used as the embryonic film of the polarizer 2. The polyvinyl alcohol-based resin can be formed into a film by a known method. The thickness of the germ film is usually from 1 to 150 μm, and is preferably 10 μm or more in consideration of ease of stretching and the like.

The polarizer 2 is subjected to the following steps, and is finally dried and produced: for example, a step of axially stretching the embryonic membrane, a step of dyeing the membrane with a dichroic dye to adsorb the dichroic dye, a step of treating the membrane with an aqueous solution of boric acid, And the step of washing the film. The thickness of the polarizer 2 is usually 1 to 30 μm, and is preferably 20 μm or less, more preferably 15 μm or less, and still more preferably 10 μm or less from the viewpoint of thin film formation of the optical film 1 with an adhesive layer.

The polarizer 2 in which the dichroic dye is adsorbed and aligned in the polyvinyl alcohol-based resin film can be subjected to a single-axis stretching treatment and dichroism according to 1) using a separate film of a polyvinyl alcohol-based resin film as a germ film. (2) a method of dyeing a dye, 2) applying a coating liquid (aqueous solution or the like) containing a polyvinyl alcohol-based resin to a substrate film, and drying the substrate to obtain a base film having a polyvinyl alcohol-based resin layer. The entire base film is stretched by one axis, and the dyed process of the dichroic dye is applied to the stretched polyvinyl alcohol-based resin layer, and then the substrate film is removed by peeling off. Substrate film system can be used with A film composed of a thermoplastic resin similar to the thermoplastic resin of the first and second resin films 3 and 4 to be described later is preferably a polyester resin such as polyethylene terephthalate or a polycarbonate resin. A film composed of a cellulose resin such as triethylenesulfonyl cellulose, a cyclic polyolefin resin such as a decylene-based resin, or a polystyrene resin. According to the method of the above 2), it is easy to produce the polarizer 2 of the film, and it is also easy to produce the polarizer 2 having a thickness of, for example, 7 μm or less.

Each of the first and second resin films 3 and 4 may be independently light transmissive, and is preferably an optically transparent thermoplastic resin such as a chain polyolefin resin (polyethylene resin or polypropylene resin). Or a polyolefin resin such as a cyclic polyolefin resin (such as a decene-based resin); a cellulose resin (such as a cellulose ester resin); and a polyester resin (polyethylene terephthalate) , polyethylene naphthalate, polybutylene terephthalate, etc.; polycarbonate resin; (meth)acrylic resin; polystyrene resin; polyether ether ketone resin; polyfluorene A resin, or a mixture of such a mixture, a copolymer, or the like. In addition, each of the first and second resin films 3 and 4 is composed 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 selected from the group is composed of a resin selected from the group consisting of a cellulose resin and a cyclic polyolefin resin.

The chain-like polyolefin resin is a copolymer of two or more kinds of chain olefins, in addition to a homopolymer of a chain olefin such as a polyethylene resin or a polypropylene resin.

The cyclic polyolefin resin contains deuterated or tetracyclododecene (alias: dimethanonaphthalene) or the like A generic term for a resin in which a cyclic olefin is a polymerized unit. Specific examples of the cyclic polyolefin-based resin include a ring-opened (co)polymer of a cyclic olefin, a hydrogenated product thereof, an addition polymer of a cyclic olefin, a cyclic olefin, and an ethylene or propylene chain olefin. Or a copolymer having an aromatic compound of a vinyl group, and a modified (co)polymer obtained by modifying such an unsaturated carboxylic acid or a derivative thereof. Among them, a decylene-based resin having a nordene-based monomer such as a norbornene or a polycyclic nordzene-based monomer as a cyclic olefin is preferred.

The cellulose resin is preferably a cellulose ester resin, that is, a partial or complete esterified product of cellulose, and examples thereof include cellulose acetate, propionate, butyrate, and a mixed ester thereof. Among them, triethyl fluorenyl cellulose, diethyl hydrazine cellulose, cellulose acetate propionate, cellulose acetate butyrate or the like is preferably used.

The polyester resin is a resin other than the cellulose ester resin having an ester bond, a polyvalent carboxylic acid or a derivative thereof, and a polycondensation polymer of a polyhydric alcohol. Specific examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, and polytrimethylene terephthalate. Ester, propylene naphthalate, polycyclohexane dimethyl terephthalate, dimethyl polycyclohexane naphthate.

The polycarbonate resin is a polyester formed of carbonic acid and glycol or bisphenol. Among them, from the viewpoint of heat resistance, weather resistance, and acid resistance, it is preferably used in an aromatic polycarbonate having a diphenyl alkane in a molecular chain. The polycarbonate can be exemplified by 2,2-bis(4-hydroxyphenyl)propane (alias bisphenol A), 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxybenzene). Cyclohexane, 1,1-bis(4-hydroxyphenyl)isobutane, 1,1-bis(4-hydroxyphenyl)ethane derived from bisphenol Polycarbonate.

The (meth)acrylic resin which can constitute the first and second resin films 3 and 4 can be a polymer mainly composed of a constituent unit derived from methacrylate (for example, containing 50% by weight or more), so that Copolymers which are further copolymerized with other copolymerization components are preferred. The (meth)acrylic resin may contain two or more kinds of constituent units derived from methacrylate. The methacrylate type may, for example, be a C ₁ to C ₄ alkyl methacrylate such as methyl methacrylate, ethyl methacrylate or butyl methacrylate.

The copolymerizable component copolymerizable with the methacrylate may, for example, be an acrylate. The acrylate is preferably a C ₁ to C ₈ alkyl acrylate such as methyl acrylate, ethyl acrylate, butyl acrylate or 2-ethylhexyl acrylate. Specific examples of the other copolymerization component include unsaturated acids such as (meth)acrylic acid; aromatic vinyl compounds such as styrene, halogenated styrene, α-methylstyrene, and vinyltoluene; a vinyl cyanide compound such as acrylonitrile; an unsaturated acid anhydride such as maleic anhydride or isocanic anhydride; an unsaturated quinone imine such as phenyl maleimide or cyclohexylmaleimine; A compound other than an acrylate of a carbon-carbon double bond. A compound having two or more polymerizable carbon-carbon double bonds in the molecule may also be used as the copolymerization component. The copolymerization component may be used alone or in combination of two or more.

In order to improve the durability of the film, the (meth)acrylic resin may have a ring structure in the polymer main chain. The ring structure is preferably a heterocyclic structure such as a cyclic acid anhydride structure, a cyclic quinone imine structure, or a lactone ring structure. Specific examples of the cyclic acid anhydride structure include, for example, glutaric anhydride structure and succinic anhydride structure. Specific examples of the structure of the cyclic quinone imine structure include a glutarylene imine structure and an amber quinone structure. Specific examples of the lactone ring structure include, for example, a butyrolactone ring structure and a valerolactone ring structure. .

The (meth)acrylic resin may contain acrylic rubber particles from the viewpoints of film forming properties of the film, impact resistance of the film, and the like. The acrylic rubber particles are particles in which an elastic polymer mainly composed of acrylate is used as an essential component, and may be, for example, a single layer structure composed of only the elastic polymer or a multilayer having one layer of the elastic polymer. Constructor. Examples of the elastic polymer include a crosslinked elastic copolymer obtained by copolymerizing an alkyl acrylate as a main component and a copolymerizable other vinyl monomer and a crosslinkable monomer. The alkyl acrylate which is a main component of the elastic polymer may, for example, be a C ₁ to C ₈ alkyl acrylate such as methyl acrylate, ethyl acrylate, butyl acrylate or 2-ethylhexyl acrylate. The number of carbon atoms of the alkyl group is preferably 4 or more.

Other vinyl single-systems copolymerizable with an alkyl acrylate may, for example, be a compound having one polymerizable carbon-carbon double bond in the molecule, and more specifically, methacrylic acid such as methyl methacrylate An aromatic vinyl compound of an ester or styrene, a vinyl cyanide compound of (meth)acrylonitrile, or the like. The crosslinkable single system may, for example, be a crosslinkable compound having at least two polymerizable carbon-carbon double bonds in the molecule, and more specifically, for example, ethylene glycol di(meth)acrylate or butane a (meth) acrylate of a polyhydric alcohol such as diol di(meth)acrylate, an alkenyl ester of (meth)acrylic acid such as allyl (meth) acrylate, or divinylbenzene.

The content of acrylic rubber particles is relative to (methyl) The acrylic resin is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, based on 100 parts by weight of the acrylic resin. If 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 to the organic solvent in the surface treatment agent is lowered. Therefore, the content of the acrylic rubber particles is usually 80 parts by weight or less, preferably 60 parts by weight or less, based on 100 parts by weight of the (meth)acrylic resin.

The first and second resin films 3 and 4 may contain general additives in the technical field of the present invention. Specific examples of the additive include, for example, an ultraviolet absorber, an infrared absorber, an organic dye, a pigment, an inorganic dye, an antioxidant, an antistatic agent, a surfactant, a slip agent, a dispersant, a heat stabilizer, and the like.

The ultraviolet absorber may, for example, be a salicylate compound, a benzophenone compound, a benzotriazole compound, or the like. A compound, a cyano (meth) acrylate compound, a nickel salt or the like.

Each of the first and second resin films 3 and 4 may be either a film that is not stretched or a film that extends through one or two axes. The two-axis extension system can simultaneously extend in two extending directions while extending the two-axis, and can also extend in a predetermined direction and then extend in two directions. The first resin film 3 and/or the second resin film 4 may be a protective film for protecting the polarizing film 2, or may be a protective film having an optical function of a retardation film to be described later. The retardation film shows an optical film of optical anisotropy. For example, a film made of the thermoplastic resin may be stretched (one-axis stretching or biaxial stretching), and a liquid crystal layer or the like may be formed on the thermoplastic resin film to form a retardation film which imparts an arbitrary retardation value.

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

The first resin film 3 and/or the second resin film 4 may have a hard coat layer, an antiglare layer, an antireflection layer, a light diffusion layer, an antistatic layer, and the like on the outer surface (the surface opposite to the polarizer 2). A surface treatment layer (coating layer) such as an antifouling layer or a conductive layer.

The thicknesses of the first resin film 3 and the second resin film 4 are usually from 1 to 150 μm, preferably from 5 to 100 μm, more preferably from 5 to 60 μm. The thickness is 50 μm or less, and more preferably 30 μm or less. The thickness of the first and second resin films 3 and 4 is reduced to the thickness of the optical film 1 and the optical layered body to which the adhesive layer is applied, and even to the liquid crystal display device including the optical film 1 or the optical layered body with the adhesive layer. Thin film formation is advantageous.

In particular, in the case of a small-sized and medium-sized polarizing plate for a smart phone or a desktop terminal, the thickness of the first resin film 3 and/or the second resin film 4 is usually 30 μm or less. The thinner one, but such a polarizing plate suppresses the contraction force of the polarizer 2, and the durability is insufficient. According to the present invention, even when such a polarizing plate is used as the optical film 10, the optical film 1 and the optical layered body with the adhesive layer having good durability can be provided. The durability of the optical film 1 and the optical laminate with the adhesive layer is such that, in a high-temperature environment, a high-temperature high-humidity environment, a high-temperature and low-temperature environment, etc., the adhesive layer 20 and the adjacent adhesive layer can be suppressed. Float or peeling of the interface of the optical member of the agent layer 20, adhesive layer The nature of the poor condition such as foaming of 20.

The first and second resin films 3 and 4 are bonded to the polarizer 2 through the adhesive layer or the adhesive layer. The adhesive forming the adhesive layer may be an aqueous adhesive or an active energy ray-curable adhesive.

The aqueous adhesive agent may, for example, be an adhesive composed of a polyvinyl alcohol-based resin aqueous solution or an aqueous two-component urethane-based emulsion adhesive. Among them, an aqueous adhesive composed of a polyvinyl alcohol-based resin aqueous solution is suitably used. In the polyvinyl alcohol-based resin, vinyl acetate and other monomers copolymerizable therewith may be used in addition to the vinyl alcohol homopolymer obtained by subjecting polyvinyl acetate of a homopolymer of vinyl acetate to saponification. The polyvinyl alcohol-based copolymer obtained by subjecting the copolymer to saponification or a modified polyvinyl alcohol-based polymer obtained by partially modifying the hydroxyl group of the copolymer or the like. The aqueous binder may 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 an aqueous adhesive is used, it is preferred to adhere the polarizer 2 and the first and second resin films 3 and 4, and then remove the water contained in the aqueous adhesive and dry it. After the drying step, a ripening step of, for example, a temperature of about 20 to 45 ° C may be provided.

The active energy ray-curable adhesive agent is an adhesive which is cured by irradiation with an active energy ray such as an ultraviolet ray or an electron beam, and is, for example, a curable composition containing a polymerizable compound and a photopolymerization initiator, and a photoreactive resin. A curable composition, a curable composition containing a binder resin and a photoreactive crosslinking agent, and the like. It is preferably an ultraviolet curable adhesive. The polymerizable compound may, for example, be a photocurable epoxy monomer, a photocurable (meth)acrylic monomer, or a photocurable urethane monomer, or may be derived from light. An oligomer of a polymerizable monomer. The photopolymerization initiator may, for example, be one containing an active species such as a neutral radical, an anionic radical, or a cationic radical by irradiation with an active energy ray. An active energy ray-curable adhesive containing a polymerizable compound and a photopolymerization initiator is preferably used: a curable composition containing a photocurable epoxy-based monomer and a photocationic polymerization initiator, or photocurability ( A curable composition of a methyl)acrylic monomer and a photoradical polymerization initiator, or a mixture of such curable compositions.

When the 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 step is performed as needed, and then the active energy is irradiated to the active energy. A hardening step of hardening the wire hardener. The light source of the active energy ray is not particularly limited, but is preferably an ultraviolet ray having a light-emitting distribution at a wavelength of 400 nm or less. Specifically, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a chemical lamp, a black lamp can be used. Microwave-excited mercury lamps, metal halide lamps, and the like.

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

The polarizing plates 10a, 10b may further contain other films or Floor. Specific examples thereof include a brightness enhancement film, an anti-glare film, an anti-reflection film, a diffusion film, a light-concentrating film, and an adhesive layer other than the adhesive layer 20, a coating layer, a protective film, and the like, in addition to the retardation film to be described later. 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 scratching or contamination. After the optical film 1 with the adhesive layer is attached to, for example, the metal layer 30, the peeling and removing is a general case. .

The protective film is usually composed of a base film and an adhesive layer laminated thereon. The base film may be a thermoplastic resin such as a polyolefin resin such as a polyethylene resin or a polypropylene resin; a polyester resin such as polyethylene terephthalate or polyethylene naphthalate; and a polycarbonate resin. (meth)acrylic resin or the like.

[1-2] phase difference plate

The retardation film contained in the retardation film is an optical film exhibiting optical anisotropy as described above, and the first and second resin films 3 and 4 can be used in addition to the thermoplastic resin exemplified above. For example, a polyvinyl alcohol-based resin, a polyarylate-based resin, a polyimide-based resin, a polyether oxime resin, a polyvinylidene fluoride/polymethyl methacrylate resin, a liquid crystal polyester resin, A stretched film obtained by stretching a resin film composed of an ethylene-vinyl acetate copolymer saponified product or a polyvinyl chloride-based resin to about 1.01 to 6 times. Among them, a stretched film in which a polycarbonate resin film, a cyclic olefin resin film, a (meth)acrylic resin film, or a cellulose resin film is stretched by one axis or biaxially is preferable. Further, the zero retardation film in the present specification is also included in the retardation film (however, it may be used as a protective film). One-axis phase A film such as a poor film, a wide viewing angle retardation film, or a low photoelastic retardation film can also be suitably used as the retardation film.

A so-called zero retardation value based retardation film face R _e and R _th retardation value in the thickness direction of the film are all 15nm to -15. This retardation film can be suitably used for an IPS mode liquid crystal display device. The in-plane retardation value R _e and the thickness direction retardation value R _{th are} preferably from -10 to 10 nm, more preferably from -5 to 5 nm. Here, the in-plane phase difference value R _e and the thickness direction phase difference value R _th are values of a wavelength of 590 nm.

The in-plane phase difference value R _e and the thickness direction phase difference value R _th are respectively defined by the following equation: R _e =(n _x -n _y )×d R _th =[(n _x +n _y )/2-n _z ] × d. In the formula, the refractive index of the slow axis direction (x-axis direction) in the plane of the n _x film, and the refractive index of the fast axis direction (the y-axis direction orthogonal to the x axis) in the plane of the n _y film, n _z is the refractive index of the film thickness direction (z-axis direction perpendicular to the film surface), and the thickness of the d-type film.

For the zero-delay film, for example, a polyolefin resin such as a cellulose resin, a chain polyolefin resin, or a cyclic polyolefin resin, a polyethylene terephthalate resin, or a (meth)acrylic resin can be used. A resin film composed of a resin. In particular, a cellulose resin, a polyolefin resin, or a (meth)acrylic resin is preferably used because the phase difference value is easily controlled and easily obtained.

Further, it is also possible to use a film which exhibits optical anisotropy by coating/alignment of a liquid crystal compound or a coating of an inorganic layered compound. A film exhibiting optical anisotropy is used as a retardation film. Such a retardation film is a type of a temperature-compensated retardation film, and a rod-shaped liquid crystal sold under the trade name "NH film" by JX Nippon Mining & Energy Co., Ltd. is obliquely aligned. The membrane, the disc-shaped liquid crystal sold by Fuji Film Co., Ltd. under the trade name "WV film", which is slanted and aligned, is sold by Sumitomo Chemical Co., Ltd. under the trade name "VAC film". A two-axis alignment type film, and a two-axis alignment type film which is sold under the trade name of "new VAC film" by Sumitomo Chemical Co., Ltd.

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

[2] adhesive layer

The adhesive layer 20 disposed between the optical film 10 and the metal layer 30 is composed of an adhesive composition containing a specific ionic compound (D). The adhesive composition generally further contains a (meth)acrylic resin (A), and may further contain an isocyanate crosslinking agent (B) and/or a decane compound (C).

By the adhesive layer 20 composed of the above-described adhesive composition, in the optical laminate including the adhesive layer 20 and the metal layer 30, corrosion of the metal layer 30 can be suppressed, and the adhesive can be improved. The durability of the optical film 1 and the optical laminate of the layer. Further, the optical film 1 and the optical laminate having the adhesive layer can exhibit good optical durability (deterioration of deterioration of optical characteristics) by the adhesive layer 20 composed of the above-described adhesive composition.

The thickness of the adhesive layer 20 is usually 2 to 40 μm, and the durability or adhesion of the optical film 1 and the optical laminate from the adhesive layer. The viewpoint of the workability of the optical film 1 of the layer is preferably 5 to 30 μm, more preferably 10 to 25 μm. In addition, when the thickness of the adhesive layer 20 is 10 μm or more, the adhesion of the adhesive layer 20 to the dimensional change of the optical film 10 is good, and when it is 25 μm or less, the workability is improved.

The adhesive layer 20 is preferably one having a storage modulus of 0.1 to 5 MPa in a temperature range of 23 to 80 °C. Thereby, the durability of the optical film 1 and the optical layered body with the adhesive layer can be more effectively improved. "Displaying a storage modulus of 0.1 to 5 MPa in a temperature range of 23 to 80 ° C" means that the storage modulus is a value within the above range at any of the temperatures. The storage modulus usually decreases with increasing temperature. Therefore, if either of the storage elastic ratios at 23 ° C and 80 ° C falls within the above range, the storage elastic modulus in the above range can be seen in the temperature of this range. . The storage modulus of the adhesive layer 20 can be measured using a commercially available viscoelasticity measuring device such as 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 containing a constituent unit derived from a (meth)acrylic monomer as a main component (preferably containing 50% by weight or more). The (meth)acrylic single system contains, for example, a monomer having a (meth)acrylonitrile group, and preferably contains an alkyl (meth)acrylate. The alkyl (meth)acrylate has an alkyl group having a carbon number of preferably 1 to 14, more preferably 1 to 12, still more preferably 1 to 8, and may be a linear, branched or cyclic structure. . For the (meth)acrylic acid alkyl ester, the alkyl group introduction described later can also be used. A substituent-containing (meth)acrylic acid alkyl ester of a substituted alkyl acrylate having a substituent. The alkyl (meth)acrylate may be used alone or in combination of two or more.

Specific examples of the alkyl (meth)acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, n- and iso-propyl (meth)acrylate, and (meth)acrylic acid. - and third-butyl ester, n- and iso-amyl acrylate, n- and iso-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, n- and iso-heptyl (meth) acrylate Ester, n- and iso-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n- and iso-decyl (meth)acrylate, n- and iso-(meth)acrylate An oxime ester, isobornyl (meth)acrylate, n- and iso-dodecyl (meth)acrylate, stearyl (meth)acrylate, and the like.

The (meth)acrylic resin (A) preferably contains a constituent unit derived from a homopolymer of a glass transition temperature Tg of an alkyl acrylate (a1) of less than 0 ° C, and a Tg derived from a homopolymer of 0. The constituent unit of the alkyl acrylate (a2) above °C. This is advantageous in improving the metal corrosion resistance and durability of the optical film 1 and the optical laminate having the adhesive layer. The Tg of the homopolymer of the alkyl acrylate may be, for example, a literature value of a Polymer Handbook (Wiley-Interscience) or the like.

Specific examples of the alkyl acrylate (a1) include ethyl acrylate, n- and iso-propyl acrylate, n- and iso-butyl acrylate, n-pentyl acrylate, n- and iso-hexyl acrylate. Ester, n-heptyl acrylate, n- and iso-octyl acrylate, 2-ethylhexyl acrylate, n- and iso-decyl acrylate, n- and iso-decyl acrylate, acrylic acid - An alkyl acrylate having an alkyl group such as a dodecyl ester of from 2 to 12 carbon atoms. Alkyl acrylate Other specific examples of (a1) include, for example, an alkyl acrylate containing a substituent in an alkyl group-introduced substituent of an alkyl acrylate having an alkyl group number of from 2 to 12. The substituent of the alkyl acrylate containing a substituent is a group of a hydrogen atom of the substituted alkyl group, and specific examples thereof include a phenyl group, an alkoxy group, and a phenoxy group. Specific examples of the alkyl acrylate containing a substituent include 2-methoxyethyl acrylate, ethoxymethyl acrylate, phenoxyethyl acrylate, phenoxy diethylene glycol acrylate, and the like. . The alkyl group of the alkyl acrylate (a1) may have an alicyclic structure, but is preferably an alkyl group having a linear or branched structure.

The alkyl acrylate (a1) may be used alone or in combination of two or more. In particular, the alkyl acrylate (a1) is preferably one or more selected from the group consisting of ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate. From the viewpoint of the followability and reworkability of the adhesive layer 20 of the optical film 1 with an adhesive layer to the optical film 10, the alkyl acrylate (a1) is preferably a 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, and tributyl acrylate.

The alkyl acrylate (a2) may be used alone or in combination of two or more. Among them, from the viewpoint of metal corrosion resistance and durability, the alkyl acrylate (a2) preferably contains methyl acrylate, cyclohexyl acrylate, isobornyl acrylate or the like, and preferably contains methyl acrylate. .

The content of the constituent unit derived from the alkyl acrylate (a2) in the (meth)acrylic resin (A), the optical film 1 and the light from the adhesive layer From the viewpoint of the metal corrosion resistance and the durability of the laminated body, it is preferably 10 parts by weight or more, more preferably 15 parts by weight based on 100 parts by weight of the total constituent unit of the (meth)acrylic resin (A). More preferably, it is more preferably 20 parts by weight or more, and particularly preferably 25 parts by weight or more. Further, from the viewpoint of the followability and reworkability of the optical film 10, the content of the constituent 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) may contain constituent units derived from monomers other than the alkyl acrylates (a1) and (a2). The (meth)acrylic resin (A) may contain one type of constituent unit derived from the other monomer, and may contain two or more kinds. Specific examples of other monomers are shown below.

1) A monomer having a polar functional group.

The single system having a polar functional group may, for example, be a (meth) acrylate having a substituent such as a hydroxyl group, a carboxyl group, a substituted or unsubstituted amino group or a heterocyclic group such as an epoxy group. Specific examples thereof include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 2-(meth)acrylate. (2-hydroxyethoxy)ethyl ester, 2-chloro-2-hydroxypropyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, diethylene glycol mono ( a monomer having a hydroxyl group such as methyl acrylate; acryloyl morpholine, vinyl caprolactam, N-vinyl-2-pyrrolidone, vinyl pyridine, tetrahydrofuran methyl (meth) acrylate, Caprolactone modified with tetrahydrofuran methyl acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, glycidyl (meth)acrylate, 2,5-dihydrofuran, etc. Monomer; (meth) propylene a monomer having a substituted or unsubstituted amine group such as an acid aminoethyl ester, N,N-dimethylaminoethyl (meth)acrylate, or dimethylaminopropyl (meth)acrylate; A monomer having a carboxyl group such as (meth)acrylic acid or carboxyethyl (meth)acrylate. Among them, a monomer having a hydroxyl group is preferred, and a point of reactivity of the (meth)acrylic resin (A) with a crosslinking agent is more preferably a (meth) acrylate having a hydroxyl group.

Further, the (meth) acrylate having a hydroxyl group and the above-mentioned monomer having another polar functional group may be contained, but from the viewpoint of preventing peeling force of the separation film laminated on the outer surface of the adhesive layer 20, substantially no A monomer having an amine group is preferred. Further, from the viewpoint of improving the corrosion resistance to ITO, it is preferred that the monomer having a carboxyl group is not substantially contained. The content of the total constituent unit of the (meth)acrylic resin (A) is not more than 0.1 part by weight.

2) A acrylamide monomer.

For example, N-methylol acrylamide, N-(2-hydroxyethyl) acrylamide, N-(3-hydroxypropyl) acrylamide, N-(4-hydroxybutyl) propylene oxime can be suitably used. Amine, N-(5-hydroxypentyl) acrylamide, N-(6-hydroxyhexyl) acrylamide, N,N-dimethyl decylamine, N,N-diethyl acrylamide, N -isopropyl acrylamide, N-(3-dimethylaminopropyl) acrylamide, N-(1,1-dimethyl-3-oxobutyl) decylamine, N- [2-(2-Sideoxy-1-imidazolidinyl)ethyl]propenylamine, 2-propenylamino-2-methyl-1-propanesulfonic acid, N-(methoxymethyl) Acrylamide, N-(ethoxymethyl)propenylamine, N-(propoxymethyl)propenylamine, N-(1-methylethoxymethyl)propenylamine, N- (1-methylpropoxy Methyl) acrylamide, N-(2-methylpropoxymethyl) acrylamide [alias: N-(isobutoxymethyl) acrylamide], N-(butoxymethyl) Acrylamide, N-(1,1-dimethylethoxymethyl)propenylamine, N-(2-methoxyethyl)propenylamine, N-(2-ethoxyethyl) Acrylamide, N-(2-propoxyethyl)propenylamine, N-[2-(1-methylethoxy)ethyl]propenylamine, N-[2-(1-methyl) Propoxy)ethyl]propenylamine, N-[2-(2-methylpropoxy)ethyl]propenylamine [alias: N-(2-isobutoxyethyl) acrylamide] N-(2-butoxyethyl) acrylamide, N-[2-(1,1-dimethylethoxy)ethyl]acrylamide or the like. Among them, N-(methoxymethyl)propenylamine, N-(ethoxymethyl)propenylamine, N-(propoxymethyl)propenylamine, N-(butoxy group) are preferably used. Methyl) acrylamide, N-(2-methylpropoxymethyl) acrylamide.

3) Methacrylate, that is, an ester of methacrylic acid.

For example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate, etc. a linear alkyl ester; a branched alkyl ester of methacrylic acid such as isobutyl methacrylate, 2-ethylhexyl methacrylate or iso-octyl methacrylate; Borneol base ester, cyclohexyl methacrylate, dicyclopentyl methacrylate, cyclododecanyl methacrylate, methylcyclohexyl methacrylate, trimethylcyclohexyl methacrylate, A Alicyclic alkyl ester of methacrylic acid such as tri-butylcyclohexyl acrylate or cyclohexyl phenyl methacrylate; 2-methoxyethyl methacrylate, ethoxy methacrylate Alkoxyalkyl ester of methacrylic acid such as ester; benzyl methacrylate Aralkyl methacrylate; 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 2-(2-hydroxyethoxy) methacrylate Ethyl ester, 2-chloro-2-hydroxypropyl methacrylate, 3-chloro-2-hydroxypropyl methacrylate, diethylene glycol monomethacrylate, etc. Alkyl ester; Aminoethyl methacrylate, N,N-dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylate, etc. A substituted or unsubstituted amine group Alkyl acrylates; 2-phenoxyethyl methacrylate, 2-(2-phenoxyethoxy)ethyl methacrylate, ethylene oxide modification of (meth)acrylic acid An ester of methacrylic acid having a phenoxyethyl group such as nonylphenol or 2-(o-phenylphenoxy)ethyl methacrylate.

4) A methacrylamide amide monomer.

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

5) Styrene monomer.

For example, styrene; methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, triethyl styrene, propyl styrene, butyl styrene, hexyl benzene Alkyl styrene such as ethylene, heptyl styrene or octyl styrene; halogenated styrene such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene or iodine; nitrostyrene; Mercaptostyrene; methoxystyrene; divinylbenzene and the like.

6) A vinyl monomer.

For example, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, etc.; vinyl halide such as vinyl chloride or vinyl bromide; vinylidene halide such as vinylidene chloride a nitrogen-containing aromatic vinyl such as vinyl pyridine, vinyl pyrrolidone or vinyl carbazole; a conjugated diene monomer such as butadiene, isoprene or chloroprene; acrylonitrile or methacrylonitrile Such as unsaturated nitrile and the like.

7) A monomer having a plurality of (meth) acrylonitrile 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 Alcohol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate is equal to two in the molecule (A) A monomer of an acrylonitrile group; a trimethylolpropane tri(meth) acrylate is equal to a monomer having three (meth) acrylonitrile groups in the molecule.

As described above, the (meth)acrylic resin (A) is derived from the alkyl (meth)acrylate from the viewpoints of durability and metal corrosion resistance of the optical film 1 and the optical laminate having the adhesive layer. The constituent unit is preferably a constituent unit containing a monomer derived from a polar functional group. The single system having a polar functional group is preferably a (meth) acrylate monomer having a polar functional group, and more preferably a monomer having a hydroxyl group. The content of the constituent unit derived from the monomer having a polar functional group is preferably 0.1 to 10 parts by weight, more preferably 0.25 to 100 parts by weight of the total constituent unit constituting the (meth)acrylic resin (A). 5 parts by weight, more preferably 0.5 to 5 parts by weight.

Further, from the viewpoint of the reworkability of the optical film 1 to which the adhesive layer is attached, the (meth)acrylic resin (A) is preferably a methacrylate (ester of methacrylic acid) or a methacrylamide. The content of the constituent unit derived from the methacrylic monomer such as a monomer is small, and specifically, the content of the constituent unit is 100 parts by weight of the total constituent unit constituting the (meth)acrylic resin (A). It is more preferably 10 parts by weight or less, more preferably 5 parts by weight or less, and substantially no such structural unit (0.1 part by weight or less).

The (meth)acrylic resin (A) preferably has a single peak in the range of the weight average molecular weight Mw of 1,000 to 2.5 million on the discharge curve in the gel permeation chromatography (GPC), and more preferably Mw 1000 to 2.5 million. It is more preferable to have a single peak in the range and to contain constituent units derived from the alkyl acrylates (a1) and (a2). The adhesive layer 20 having such a (meth)acrylic resin (A) as a matrix polymer is advantageous in terms of improving the durability of the optical film 1 and the optical laminate of the adhesive layer. When the number of peaks in the range of the above Mw is 2 or more, sufficient durability may not be obtained.

When the number of peaks of the GPC discharge curve in the range of Mw 1000 to 2.5 million was obtained, the discharge curve was obtained according to the GPC measurement conditions described in the examples. The "having a single peak" in the above range of the obtained discharge curve means that there is only one maximum value in the range of Mw 1000 to 2.5 million. In the present specification, in the GPC discharge curve, a band having an S/N ratio of 30 or more is defined as a peak.

The (meth)acrylic resin (A) is preferably in the range of 500,000 to 2.5 million in terms of standard polystyrene obtained by GPC, more preferably in the range of 600,000 to 2,000,000. If the Mw is more than 500,000, it is attached. The improvement of the metal corrosion resistance and durability of the optical film 1 and the optical laminate of the agent layer is advantageous, and there is a tendency to improve the reworkability of the optical film 1 with the adhesive layer. Further, when the Mw is 2.5 million or less, the adhesion of the adhesive layer 20 to the dimensional change of the optical film 10 is good. The molecular weight distribution represented by the ratio Mw/Mn of the weight average molecular weight Mw and the number average molecular weight Mn is usually 2 to 10. The Mw and Mn of the (meth)acrylic resin (A) were determined according to the GPC measurement conditions described in the examples.

When the (meth)acrylic resin (A) is a solution having a concentration of 20% by weight dissolved in ethyl acetate, the viscosity at 25 ° C is preferably 20 Pa ‧ or less, more preferably 0.1 to 7 Pa ‧ s. . The viscosity in such a range is advantageous in that the durability of the optical film 1 and the optical layered body with the adhesive layer is improved, or the reworkability of the optical film 1 to which the adhesive layer is attached. The above viscosity is determined by a Brookfield viscometer.

The (meth)acrylic resin (A) is preferably a glass transition temperature Tg of from -60 to -10 ° C as measured by a differential scanning calorimeter (DSC), more preferably from -55 to -15 ° C. The Tg in such a range is advantageous in improving the metal corrosion resistance and durability of the optical film 1 and the optical laminate having the adhesive layer.

The adhesive composition may contain two or more (meth)acrylic resins belonging to the (meth)acrylic resin (A). Further, the 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 and the optical laminate having the adhesive layer, the content of the (meth)acrylic resin (A) is all (meth)acrylic resin. It In general, it is preferably 70% by weight or more, more preferably 80% by weight or more, still more preferably 90% by weight or more, and the adhesive composition contains only the (meth)acrylic resin (A) as a matrix polymer. Especially good.

The (meth)acrylic resin (A) or other (meth)acrylic resin which can be used in combination as needed can be known by, for example, a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method, or the like. The method to manufacture. A polymerization initiator can be usually used in the production of a (meth)acrylic resin. The polymerization initiator is used in an amount of about 0.001 to 5 parts by weight based on 100 parts by weight of the total of all monomers which can be used for the production of the (meth)acrylic resin. Further, the (meth)acrylic resin can be produced, for example, by a method in which polymerization is carried out by an active energy ray such as ultraviolet rays.

As the polymerization initiator, a thermal polymerization initiator, a photopolymerization initiator, or the like can be used. The photopolymerization initiator may, for example, be 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl) ketone or the like. The thermal polymerization initiator may, for example, be 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 , an azo compound of dimethyl-2,2'-azobis(2-methylpropionate), 2,2'-azobis(2-hydroxymethylpropionitrile); Oxide, tri-butyl hydroperoxide, benzammonium peroxide, tert-butyl peroxybenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, Propyl peroxydicarbonate, tri-butyl peroxy neodecanoate, tert-butylperoxytrimethyl acetate, (3,5,5-trimethylhexyl) peroxidation Organic peroxides; potassium persulfate, ammonium persulfate, inorganic peroxides of hydrogen peroxide, and the like. Again, using peroxide A redox initiator such as a reducing agent can also be used as a polymerization initiator.

The method for producing the (meth)acrylic resin is preferably the solution polymerization method as described above. An example of the solution polymerization method is a monomer and an organic solvent used for mixing, and a thermal polymerization initiator is added under a nitrogen atmosphere at a temperature of about 40 to 90 ° C, preferably about 50 to 80 ° C, and stirred for 3 to 15 hours. about. In order to control the reaction, a monomer or a thermal polymerization initiator is continuously or intermittently added in the polymerization, or is added in a state of being dissolved in an organic solvent. As the organic solvent, for example, an aromatic hydrocarbon such as toluene or xylene; an ester such as ethyl acetate or butyl acetate; an aliphatic alcohol such as propanol or isopropanol; acetone, methyl ethyl ketone or methyl isobutyl ketone; Ketones, etc.

[2-4] Isocyanate crosslinking agent (B)

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

The isocyanate crosslinking agent (B) is a compound having at least two isocyanato groups (-NCO) in the molecule, and specific examples thereof include toluene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate. Xylene diisocyanate, hydrogenated xylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, and the like. Further, the isocyanate crosslinking agent (D) is acceptable A polyol compound adduct of such an isocyanate compound (for example, an adduct of glycerin or trimethylolpropane), a trimer isocyanate compound, a biuret type compound, and more preferably a polyether polyol or polyester. A derivative such as a urethane prepolymer type isocyanate compound obtained by an addition reaction such as a polyhydric alcohol, an acrylonitrile-based polyhydric alcohol, a polybutadiene polyol, or a polyisoprene polyol. Among the above, particularly preferred are toluene diisocyanate, hexamethylene diisocyanate, xylene diisocyanate or a polyol compound adduct of such an isocyanate compound, which is durable from the optical film 1 and the optical laminate of the adhesive layer. From the viewpoint of the above, xylene diisocyanate or a polyol compound adduct thereof is more preferable.

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 by weight (for example, 1 part by weight or less) based on 100 parts by weight of the (meth)acrylic resin (A). . When the content of the isocyanate crosslinking agent (B) is within this range, it is advantageous in both the metal film corrosion resistance and the durability of the optical film 1 and the optical laminate of the pressure-sensitive adhesive layer.

The adhesive composition may be used in combination with an isocyanate crosslinking agent (B) and a crosslinking agent other than the crosslinking agent such as an epoxy compound, an aziridine compound, a metal chelate compound, a peroxide, etc., but from an adhesive layer. From the viewpoint of metal corrosion resistance and durability of the optical film 1 and the optical laminate, the adhesive composition contains only the isocyanate crosslinking agent (B) as a crosslinking agent, and particularly contains no peroxide. Preferably. Here, the content of the (meth)acrylic resin (A) is substantially 0.01 part by weight or less based on 100 parts by weight of the (meth)acrylic resin (A).

[2-3] decane compound (C)

The adhesive composition may contain a decane compound (C). Thereby, the adhesion of the adhesive layer 20 to the metal layer 30, the glass substrate, etc. can be improved. Two or more kinds of decane compounds (C) can also be used.

The decane compound (C) may, for example, be vinyltrimethoxydecane, vinyltriethoxydecane, vinylstilbene (2-methoxyethoxy)decane, 3-glycidoxypropyltrimethoxy Baseline, 3-glycidoxypropyltriethoxydecane, 3-glycidoxypropylmethyldimethoxydecane, 3-glycidoxypropylethoxymethyl Decane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxydecane, 3-chloropropylmethyldimethoxydecane, 3-chloropropyltrimethoxydecane, 3-methylpropene醯oxypropyltrimethoxydecane, 3-hydrothiopropyltrimethoxydecane, and the like.

The decane compound (C) may contain a polyoxyxene oligomer type. Specific examples of the polyoxyxene oligomer are expressed as a combination of monomers, as follows.

3-Hydroxythiopropyltrimethoxydecane-tetramethoxydecane oligomer, 3-hydrothiopropyltrimethoxydecane-tetraethoxydecane oligomer, 3-hydrothiopropyltri An oligomer containing a thiopropyl group such as an ethoxy decane-tetramethoxy decane oligomer or a 3-hydrothiopropyltriethoxy decane-tetraethoxy decane oligomer; a thiol group; Methyltrimethoxydecane-tetramethoxydecane oligomer, thiolmethyltrimethoxydecane-tetraethoxydecane oligomer, thiomethylmethyltriethoxydecane-tetramethoxy Decane oligomer, Oxythiomethyl-containing oligomer such as thiomethylmethyltriethoxydecane-tetraethoxydecane oligomer; 3-glycidoxypropyltrimethoxydecane-tetramethoxydecane Copolymer, 3-glycidoxypropyltrimethoxydecane-tetraethoxydecane copolymer, 3-glycidoxypropyltriethoxydecane-tetramethoxydecane copolymer, 3- Glycidoxypropyltriethoxydecane-tetraethoxydecane copolymer, 3-glycidoxypropylmethyldimethoxydecane-tetramethoxydecane copolymer, 3-epoxy Propyloxypropylmethyldimethoxydecane-tetraethoxydecane copolymer, 3-glycidoxypropylmethyldiethoxydecane-tetramethoxydecane copolymer, 3-epoxy a copolymer containing 3-glycidoxypropyl group, such as a propoxypropylmethyldiethoxydecane-tetraethoxydecane copolymer; 3-methylpropenyloxypropyltrimethoxydecane- Tetramethoxydecane oligomer, 3-methacryloxypropyltrimethoxydecane-tetraethoxydecane oligomer, 3-methylpropenyloxypropyltriethoxydecane-four Methoxy decane oligomer, 3-methyl propylene oxime Propyltriethoxysilane Silane - tetraethyl orthosilicate oligomers, methyl propyl methyl dimethoxy Bing Xixi Silane - Silane tetramethoxysilane oligomer, 3-methylpropenyloxypropylmethyldimethoxydecane-tetraethoxydecane oligomer, 3-methylpropenyloxypropylmethyldiethoxydecane-tetramethoxydecane Oligomer, 3-methacryloxypropylmethyldiethoxydecane-tetraethoxydecane oligomer, etc. oligomer containing methacryloxypropyl group; 3-propene oxide Propyltrimethoxydecane-tetramethoxydecane oligomer, 3-propenyloxypropyltrimethoxydecane-tetraethoxydecane oligomer, 3-propenyloxypropyltriethoxy Cyclodecane-tetramethoxydecane oligomer, 3-propenylmethoxypropyltriethoxydecane-tetraethoxydecane oligomer, 3-propenyloxypropylmethyldimethoxydecane -tetramethoxydecane oligomer, 3-propenylmethoxypropylmethyldimethoxydecane-tetraethoxydecane oligomer, 3-propenyloxypropylmethyldiethoxydecane - oligomers containing propylene methoxy propyl groups such as tetramethoxy decane oligomer, 3-propenyl methoxymethyl methyl diethoxy decane-tetraethoxy decane oligomer; vinyl trimethyl Oxydecane-tetramethoxynonane oligomer, Vinyl trimethoxy decane-tetraethoxy decane oligomer, vinyl triethoxy decane-tetramethoxy decane oligomer, vinyl triethoxy decane-tetraethoxy decane oligomer, Vinylmethyldimethoxydecane-tetramethoxydecane oligomer, vinylmethyldimethoxydecane-tetraethoxydecane oligomer, vinylmethyldiethoxydecane-tetramethyl a vinyl-containing oligomer such as a oxydecane oligomer, a vinylmethyldiethoxydecane-tetraethoxydecane oligomer, or the like; 3-aminopropyltrimethoxydecane-tetramethoxydecane Copolymer, 3-aminopropyltrimethoxydecane-tetraethoxydecane copolymer, 3-aminopropyltriethoxydecane-tetramethoxydecane copolymer, 3-aminopropyltriethyl Oxydecane-tetraethoxydecane copolymer, 3-aminopropylmethyldimethoxydecane-tetramethoxydecane copolymer, 3-aminopropylmethyldimethoxydecane-tetraethyl Oxydecane copolymer, 3-aminopropylmethyldiethoxydecane-tetramethoxydecane copolymer, 3-aminopropylmethyldiethoxydecane-tetraethoxydecane copolymer, etc. A copolymer containing an amine group or the like.

The content of the decane compound (C) in the adhesive composition is usually 0.01 to 10 parts by weight, preferably 0.03 to 5 parts by weight, based on 100 parts by weight of the (meth)acrylic resin (A), more preferably It is 0.05 to 2 parts by weight, more preferably 0.1 to 1 part by weight. When the content of the decane compound (B) is 0.01 parts by weight or more, the adhesion improving effect of the adhesive layer 20, the metal layer 30, or the glass substrate can be easily obtained. Further, when the content is 10 parts by weight or less, the bleed out of the decane compound (B) from the adhesive layer 20 can be suppressed.

[2-4] Ionic compound (D)

The adhesive composition contains an ionic compound (D). In one implementation form In the first embodiment, the ionic compound (D) has a solubility of 100 g or less per 100 g of water at 60 ° C. The solubility of the ionic compound (D) is preferably 3 g or less, more preferably 1 g or less, still more preferably 0.4 g or less. By using an ionic compound (D) having a solubility of 100 g or less per 100 g of water at 60 ° C, it is possible to impart not only excellent antistatic properties to the adhesive layer 20 but also excellent metal corrosion resistance and optical durability. The adhesive composition may contain one or two or more kinds of ionic compounds (D) having a solubility of 100 g or less per 100 g of water at 60 ° C.

The solubility of 100 g of the ionic compound in water at 60 ° C can be measured in the following manner. That is, 100 mg of the ionic compound of the fine scale and 2 mL of pure water were mixed, and then stored under stirring at a temperature of 60 ° C for 24 hours. Then, a part of the water layer (fine weighing amount) is sampled, and the weight concentration of the ionic compound dissolved in the obtained measurement sample is diluted with the mobile phase used for the liquid chromatography analysis described below or diluted with the liquid medium constituting the liquid crystal layer. Quantitative, and the solubility is determined from the quantitative value. This quantification is usually done using liquid chromatography. The specific measurement conditions can be based on the description of the items of the examples to be described later. However, when it is difficult to quantify by the liquid chromatography method, an ion chromatography method (IC), an elemental analysis method, an ICP luminescence method, an electrophoresis method, or the like can be used.

From the viewpoint of the above solubility, the cation of the ionic compound (D) is preferably an organic cation. Specific examples of the organic cation include a pyridinium cation, an imidazolium cation, a piperidinium cation, a pyrrolidinium cation, a tetrahydropyridinium cation, a dihydropyridinium cation, a tetrahydropyrimidinium cation, a dihydropyrimidinium cation, and a pyridinium. An oxazolium cation, a pyrazolinium cation, an ammonium cation, a phosphonium cation, a phosphonium cation, or the like. Organic cation The subunit preferably has a substituent. For example, by adjusting the carbon number of the substituent, the above solubility of the ionic compound (D) can be controlled. The substituent is, for example, a hydrocarbon group having 1 to 20 carbon atoms which may contain a hetero atom, and preferably a hydrocarbon group having 1 to 16 carbon atoms which may contain a hetero atom. The hydrocarbon group is, for example, an alkyl group in a linear, branched or cyclic configuration, preferably an alkyl group in a linear or branched configuration.

The anion of the ionic compound (D) of the first embodiment may be either an inorganic anion or an organic anion. Specific examples of the inorganic anion include a chloride anion [Cl ^- ], a bromine anion [Br ^- ], an iodine anion [I ^- ], an aluminum tetrachloride anion [AlCl ₄ ^- ], an aluminum hexachloride anion [Al ₂ Cl ₇ ^- ], boron tetrafluoride anion [BF ₄ ^- ], phosphorus hexafluoride anion [PF ₆ ^- ], perchlorate anion [ClO ₄ ^- ], nitrate anion [NO ₃ ^- ], arsenic hexafluoride anion [AsF] ₆ ^- ], antimony hexafluoride anion [SbF ₆ ^- ], antimony hexafluoride anion [NbF ₆ ^- ], antimony hexafluoride anion [TaF ₆ ^- ], bis(fluorosulfonyl) imine anion [(FSO ₂ ) ₂ N ^- ], (poly) hydrofluorinated fluoride anion [F(HF) _n ^- ] (n is about 1 to 3) and the like.

Specific examples of the organic anion include an acetate anion [CH ₃ COO ^- ], a trifluoroacetate anion [CF ₃ COO ^- ], a methanesulfonate anion [CH ₃ SO ₃ ^- ], a 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 ^- ], ginseng (Trifluoromethanesulfonyl)methyl anion [(CF ₃ SO ₂ ) ₃ C ^- ], dimethylphosphonate anion [(CH ₃ ) ₂ POO ^- ], thiocyanate anion [SCN ^- ], perfluorobutane Alkanesulfonate anion [C ₄ F ₉ SO ₃ ^- ], bis(pentafluoroethanesulfonyl)imide anion [(C ₂ F ₅ SO ₂ ) ₂ N ^- ], perfluorobutyrate anion [C ₃ F ₇ COO ^- ], (trifluoromethanesulfonyl) (trifluoromethanecarbonyl) imine anion [(CF ₃ SO ₂ )(CF ₃ CO)N ^- ], perfluoropropane-1,3-disulfonate Anion [ ^- O ₃ S(CF ₂ ) ₃ SO ₃ ^- ], carbonate anion [CO ₃ ^2- ], tetraarylborate anion (for example, ruthenium (pentafluorophenyl) borate anion, etc.), dicyandiamide An amine anion [(CN) ₂ N ^- ], and an imine anion represented by the following formula (III): Among them, an anion containing a fluorine atom tends to have an ionic compound (D) which is excellent in antistatic property, and is preferable. In particular, an anion is used as a bis(trifluoromethanesulfonyl)imide anion, a bis(fluorosulfonyl)imide anion, an imine anion represented by the above formula (III), or a quinone (pentafluorophenyl)boronic acid. When the ionic compound (D) of the anion is used, it is advantageous in improving the antistatic property, metal corrosion resistance, and optical durability of the optical film 1 and the optical laminate having the adhesive layer. Among them, an imine anion containing a fluorine atom such as an bis(trifluoromethanesulfonyl)imide anion, a bis(fluorosulfonyl)imide anion, or an imide anion represented by the above formula (III) is preferred. More preferably, the bis(trifluoromethanesulfonyl)imide anion or the bis(fluorosulfonyl)imide anion is more preferably the bis(fluorosulfonyl)imide anion.

Further, in another embodiment (second embodiment), the ionic compound (D) is an ionic compound represented by 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 represents a hydrocarbon group having 4 to 20 carbon atoms which may contain a hetero atom. X ^- represents an imine anion containing a fluorine atom. The hydrocarbon group constituting 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), the adhesive layer 20 can impart not only excellent antistatic properties but also excellent metal corrosion resistance and optical durability. The adhesive composition may contain one or two or more kinds of the ionic compound (D) represented by the above formula (I). The ionic compound (D) represented by the above formula (I) preferably has a solubility of 100 g or less per 100 g of water at 60 ° C 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, still more preferably 1 g or less, and particularly preferably 0.4 g or less.

R ¹ and R ² are each independently a hydrogen atom or a linear, branched or cyclic alkyl group having a carbon number of 1 to 16 which may contain a hetero atom. R ^{3 is} preferably an alkyl group which may have a linear or branched configuration of 4 to 20 carbon atoms of a hetero atom. The carbon number of R ³ is preferably 4 to 10, more preferably 4 to 8, 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 Hydropyrimidine cation, pyrazolium cation, pyrazolinium cation, and the like. These cations may have a substituent. The substituent is, for example, a carbon which may contain a hetero atom The hydrocarbon group of 1 to 20 is preferably a hydrocarbon group having 1 to 16 carbon atoms. The hydrocarbon group is, for example, an alkyl group in a linear, branched or cyclic configuration, preferably an alkyl group in a linear or branched configuration.

From the viewpoint of thinning of the polarizing plate, the polarizing plate 10a shown in Fig. 2 is advantageous in that the resin film is disposed only on one side of the polarizer 2. At this time, the adhesive layer 20 is directly bonded to the other surface of the polarizer 2 to form an optical film 1 with an adhesive layer (see FIG. 4). In the case of the polarizing plate of this type, the problem of lowering the optical performance of the polarizing plate in a high-temperature and high-humidity environment due to the ionic compound contained in the adhesive layer 20 is particularly remarkable, but by including the above formula (I) When an adhesive composition of the ionic compound (D) (for example, an adhesive composition of an ionic compound (D) having a pyrrolizinium cation) is used, even when such a polarizing plate is used as the optical film 10, An optical film 1 and an optical layered body having an adhesive layer having good optical durability (a property of suppressing deterioration of optical characteristics) are provided.

Further, in another embodiment (third embodiment), the ionic compound (D) is an ionic compound represented by the following formula (II): By using the ionic compound (D) represented by the above formula (II), not only the adhesive layer 20 can be imparted with excellent antistatic properties, but also excellent metal corrosion resistance and optical durability can be imparted. The adhesive composition may contain one or two or more kinds of the ionic compound (D) represented by the above formula (II). The ionic compound (D) represented by the above formula (II) preferably has a solubility of 100 g or less per 100 g of water at 60 ° C from the viewpoint of metal corrosion resistance and optical durability. The solubility of the ionic compound (D) represented by the above formula (II) is preferably 3 g or less, more preferably 1 g or less, and particularly preferably 0.4 g or less.

In the above formula (II), R ⁴ represents an alkyl group having a linear or branched structure of 3 to 16 carbon atoms, and R ⁵ to R ⁹ each independently represent a hydrogen atom, an alkyl group which may have a substituent, and may have An alkenyl group of 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, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group or a halogen atom, and adjacent substituents may also be used. Combine to form a ring. X ^- represents a system of the above formula (I) the X ^- have the same meaning. The ionic compound (D) represented by the above formula (II) may be a suitable example of an ionic compound having a solubility of 100 g or less per 100 g of water at 60 ° C.

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, a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, an octyl group, a decyl group, and a dodecyl group. , octadecyl, isopropyl, isobutyl, second-butyl, tert-butyl, 1-ethylpentyl, cyclopentyl, cyclohexyl, trifluoromethyl, 2-ethylhexyl , benzamidine methyl, 1-naphthylmethylmethyl, 2-naphthylmethylmethyl, 4-methylthiobenzimidylmethyl, 4-phenylthiobenzimidylmethyl, 4 - dimethylaminobenzimidylmethyl, 4-cyanobenzhydrylmethyl 4-methylbenzhydrylmethyl, 2-methylbenzhydrylmethyl, 3-fluorobenzhydrylmethyl, 3-Trifluoromethylbenzimidylmethyl, 3-nitrobenzimidylmethyl.

The alkenyl group which may have a substituent is preferably an alkenyl group having 2 to 10 carbon atoms, and specific examples thereof include, for example, a vinyl group, an allyl group, and a styrene group. base. 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, a 9-fluorenyl group, and 9 -phenanthryl, 1-indenyl, 5-thick tetraphenyl, 1-indenyl, azulenyl, 9-fluorenyl, triphenyl, biphenyl, o-, m-, And p-tolyl, xylyl, o-, m-, and p-cumyl, mesityl, cyclopentadienyl, binaphthyl, dinaphthyl, dinaphthyl, And cycloheptatrienyl, biphenyl, dicyclopentadienylphenyl, fluorenyl, fluorenyl, benzofluorenyl, phenylnaphthyl, fluorenyl, fluorenyl, fluorenyl , hydrazine, hydrazinyl, fluorenyl, phenanthryl, triphenyl, fluorenyl, benzophenanyl, tetraphenyl, heptaenyl, decyl, decyl, pentaphenyl, thick Pentaphenyl, tetraphenylene, hexaphenyl, hexaphenyl, ruthenyl, coromenyl, extended trinaphthyl, heptaphenyl, hexaphenyl, fluorenyl, fluorenyl.

The heterocyclic group which may have a substituent is preferably an aromatic or aliphatic heterocyclic ring containing a nitrogen atom, an oxygen atom, a sulfur atom or a phosphorus atom, and specific examples thereof are, for example, a thienyl group, a benzo[b]thienyl group, Naphtho[2,3-b]thienyl, thioxyl, furyl, pyranyl, isobenzofuranyl, benzopyranyl, xanthenyl, brown Thio group, 2H-pyrrolyl, pyrrolyl, imidazolyl, pyrazolyl, pyridyl, pyridyl Base, pyrimidinyl, oxime , indolizinyl, isodecyl, 3H-fluorenyl, fluorenyl, 1H-carbazolyl, fluorenyl, 4H-quin Base, isoquinolyl, quinolyl, anthracene Naphthyridinyl, quinine Lolinyl, quinazolinyl, cinnolinyl, acridinyl, 4aH-carbazolyl, oxazolyl, β-carbolinyl, phenanthryl, acridinyl, acridinyl, morpholinyl, brown Thiophene Base, isothiazolyl, thiophene Basis Azyl, furazolyl, brown Base, isocoumarin, coumarin, pyrrolidinyl, pyrrolinyl, imidazolidinyl, imidazolinyl, pyrazolidinyl, pyrazolyl, piperidinyl, piperidin Base, porphyrinyl, isoindolyl, quinuclidinyl, morpholinyl, thioxanthone.

The above-mentioned alkyl group which may have a substituent, an alkenyl group which may have a substituent, an alkynyl group which may have a substituent, an aryl group which may have a substituent, and a substitution of a hydrogen atom which may have a heterocyclic group which may have a substituent Specific examples of the group include a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom or an iodine atom; an alkoxy group such as a methoxy group, an ethoxy group or a tris-butoxy group; a phenoxy group or a p-tolyloxy group; Alkoxycarbonyl group such as an aryloxy group, a methoxycarbonyl group, a butoxycarbonyl group, a phenoxycarbonyl group, a vinyloxycarbonyl group or an aryloxycarbonyl group; an ethoxy group, a propenyloxy group, a benzamidine group An oxo group such as an oxy group; an oxime group such as an ethyl fluorenyl group, a benzhydryl group, an isobutyl fluorenyl group, an acryl fluorenyl group, a methacryl fluorenyl group, or a methoxycyanyl group; a methylthio group and a tert-butylthio group; An alkylthio group; an arylthio group such as a phenylthio group or a p-tolylthio group; an alkylamino group such as a methylamino group or a cyclohexylamino group; a dimethylamino group, a diethylamino group, a dialkylamino group such as N-morpholinyl or N-piperidinyl; an arylamine group such as a phenylamino group or a p-tolylamino group; a methyl group, an ethyl group, a tert-butyl group or a dodecyl group; An alkyl group; an aryl group such as a phenyl group, a p-tolyl group, a xylyl group, a cumyl group, a naphthyl group, an anthranyl group or a phenanthryl group; a hydroxyl group, a carboxyl group, a decylamino group, a decyl group, a thiol group, a sulfo group , mesityl, p-toluenesulfonyl, amine, nitro, nitroso, cyano, trifluoromethyl, trichloromethyl, trimethylsulfonyl, phosphonic acid subunit, phosphonium, Alkylsulfonyl, Arylsulfonyl, trialkylammonium, dimethylindenyl, triphenylbenzylidenemethylhydrazine.

In the N-substituted pyridinium cation of the ionic compound (D) represented by the above formula (II), R ⁴ is a linear or branched alkyl group having a carbon number of 3 to 16. R ⁵ to R ⁹ are each independently preferably a hydrogen atom, an alkyl group having a carbon number of 1 to 20, a branched or cyclic structure, a hydroxyl group, or a halogen atom, more preferably a hydrogen atom or a carbon number of 1 to The alkyl group of a linear or branched structure of 20 is more preferably a hydrogen atom or an alkyl group having a linear or branched structure of from 1 to 16.

X ^- in the above formulae (I) and (II) represents an imine anion of a fluorine atom. The use of the ionic compound (D) having an anion of a fluorine atom-containing anion anion is advantageous in improving the antistatic property, metal corrosion resistance and optical durability of the optical film 1 and the optical laminate having the adhesive layer. Among them, a bis(trifluoromethanesulfonyl)imide anion, a bis(fluorosulfonyl)imide anion, and an imine anion such as an imide anion represented by the above formula (III) are preferably used. The bis(trifluoromethanesulfonyl)imide anion, bis(fluorosulfonyl)imide anion is more preferred, and the bis(fluorosulfonyl)imide anion is more preferably.

A preferred example of the ionic compound (D) represented by the above formula (I) or (II) is an ionic compound represented by the following formula (IV): In the above formula (IV), R ⁴ is an alkyl group having a linear or branched structure of 3 to 16 carbon atoms, and R ⁵ to R ⁹ are each independently a hydrogen atom or a linear or branched carbon number of 1 to 16. Constructed alkyl. X ₁ ^- is a bis(trifluoromethanesulfonyl)imide anion or a bis(fluorosulfonyl)imide anion.

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

In the adhesive composition, the ionic compound (D) of the first, second, and/or third embodiments and the antistatic agent other than the above may be used in combination, but the optical film 1 and the optical laminate of the adhesive layer are used. From the viewpoint of metal corrosion resistance and the like, the adhesive composition preferably contains only the ionic compound (D) of the first, second, and/or third embodiments as an antistatic agent.

[2-5] Other ingredients

The adhesive composition may contain one or two additives such as a solvent, a crosslinking catalyst, a UV absorber, a weathering stabilizer, a tackifier, a plasticizer, a softener, a dye, a pigment, an inorganic filler, and a light-scattering fine particle. More than one species. Alternatively, an ultraviolet curable compound may be blended in the adhesive composition to form an adhesive layer, which is cured by irradiation with ultraviolet rays, and is used to form a harder adhesive layer. The cross-linking catalyst system may, for example, be hexamethylenediamine or ethylenediamine. An amine compound such as polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophoronediamine, trimethylenediamine, polyamine resin, and melamine resin.

The adhesive composition may contain a rust preventive for improving the metal corrosion resistance of the optical film 1 and the optical laminate of the adhesive layer. The anti-caries agent is a triazole compound such as a benzotriazole-based compound or another triazole-based compound; a thiazole-based compound such as a benzothiazole-based compound or another thiazole-based compound; a benzylimidazole-based compound or another imidazole-based compound; Imidazole compound such as compound; imidazoline compound; quinoline compound; pyridine compound; pyrimidine compound; anthraquinone compound; amine compound; urea compound; sodium benzoate; - second-butyl sulfide; and diphenylarylene.

However, according to the present invention, even if the rust preventive agent is not contained, sufficient metal corrosion resistance can be obtained, so that the content of the rust preventive agent is as small as possible. In particular, the adhesive composition is preferably a triazole-based compound which does not substantially contain a rust preventive agent, and is preferably more preferably contains no rust inhibitor selected from the above compound group. The content of the (meth)acrylic resin (A) is preferably 0.01 parts by weight or less based on 100 parts by weight of the (meth)acrylic resin (A).

[3] Metal layer and substrate

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

The metal layer 30 may be a metal oxide layer such as ITO. However, the optical film 1 of the adhesive layer of the present invention is particularly resistant to metal monomers or alloys, so the metal layer 30 is comprised by the above. A metal monomer composed of a metal element and/or an alloy containing two or more kinds of the above metal elements is preferable. However, the optical layering system may have such a metal layer 30 and a transparent electrode layer composed of a metal oxide such as ITO.

The form (for example, thickness) or the preparation method of the metal layer 30 is not particularly limited, and may be a metal foil, or may be a vacuum deposition method, a sputtering method, an ion plating method, an inkjet printing method, or gravure printing. The method is formed by a method, but is preferably a metal layer formed by a sputtering method, an inkjet printing method, or a gravure printing method, and more preferably a metal layer formed by sputtering. The metal layer formed by sputtering and the metal foil have a tendency to have poor corrosion resistance. However, according to the optical laminate of the present invention, metal corrosion resistance is good even for a metal layer formed by sputtering. . 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. Further, the thickness of the metal layer 30 is usually 0.01 μm or more. Further, when the metal layer 30 is a metal wiring layer, the metal wiring layer has a metal wiring having a line width of usually 10 μm or less, preferably 5 μm or less, and more preferably 3 μm or less. Further, the line width of the metal wiring is usually 0.01 μm or more, preferably 0.1 μm or more, and more preferably 0.5 μm or more. For the metal layer 30 of such a film Or the metal layer 30 composed of the metal wires of the thin wires, the optical laminate of the present invention also exhibits good metal corrosion resistance. In particular, when the metal wiring has a thickness of 3 μm or less, a line width of 10 μm or less, or a thickness of 3 μm or less and a line width of 10 μm or less, corrosion, particularly pitting corrosion, can be suppressed even when formed by a sputtering method.

The metal layer 30 is, for example, a metal wiring layer (ie, an electrode layer) of a touch input element of the touch input type liquid crystal display device. At this time, the metal layer 30 is generally patterned into a predetermined shape. When the adhesive layer 20 is laminated on the patterned metal layer 30, the 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 comprising the above metal or alloy.

Further, the metal layer 30 may have a single layer structure or a multilayer structure of two or more layers. The metal layer of the multilayer structure may, for example, be a metal-containing layer (metal mesh or the like) having a three-layer structure represented by molybdenum/aluminum/molybdenum.

As shown in Fig. 1, a metal layer 30 such as a metal wiring layer is usually formed on the substrate 40. In this case, the optical layering system of the present invention comprises the substrate 40. The formation of the metal layer 30 on the substrate 40 can be performed by, for example, sputtering. The substrate 40 may 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 of the glass substrate include soda lime glass, low alkali glass, and alkali-free glass. The metal layer 30 may be formed on the entire substrate 40 or formed on a part thereof. When the metal layer 30 is formed on the surface of the substrate 40 when the patterned metal layer 30 is formed on the substrate 40, a portion of the adhesive layer 20 is directly in contact with the substrate 40 formed of glass, for example, but Optical laminate of the invention Since the adhesive layer 20 in the body is also excellent in adhesion to glass, the optical layered body and the liquid crystal display device including the optical layered body are excellent in durability.

[4] Composition and manufacturing method of optical laminate

In one embodiment, as shown in Figs. 4 and 5, the optical layering system of the present invention comprises an optical film 1 with an adhesive layer and a metal layer 30 laminated on the side of the adhesive layer 20. In the optical laminates 5, 6 shown in Figs. 4 and 5, the optical film 1 with the adhesive layer is laminated on the metal layer 30 such that the adhesive layer 20 directly contacts the metal layer 30. According to the present invention, even in the optical layered body in which the adhesive layer 20 directly contacts the metal layer 30, the corrosion of the metal layer 30 can be effectively suppressed.

Fig. 6 is a schematic cross-sectional view showing another example of the layer constitution of the optical layered body of the present invention. In the other embodiment, the optical layered body 7 of the present invention has the optical layered body 7 shown in Fig. 6, and the adhesive layer 20 of the optical film 1 with the adhesive layer is laminated on the metal layer 30 through the resin layer 50. The adhesive layer 20 is in direct contact with the resin layer 50. Even in such an optical layered body 7, corrosion of the metal layer 30 can be effectively suppressed. The resin layer 50 disposed between the adhesive layer 20 and the metal layer 30 may be, for example, a cured layer of a curable resin. A curable resin which can form the resin layer 50 can be used, and it is known, for example, as described in JP-A-2009-217037.

As described above, the metal layer 30 may be a metal wiring layer. will An example of the case where 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 layering system is bonded to the optical layer 1 including the optical film 10 and the adhesive layer 20 of the adhesive layer 20 laminated on at least one surface thereof through the adhesive layer 20, for example, on the metal layer 30 formed on the substrate 40. You can make it.

As described above, the optical film 1 with the adhesive layer includes the optical film 10 and the adhesive layer 20 laminated on at least one side thereof (Fig. 1). The double layer adhesive layer 20 of the optical film 10 can also be used. Generally, the adhesive layer 20 is directly laminated on the surface of the optical film 10. When the adhesive layer 20 is provided on the surface of the optical film 10, it is preferable to form an undercoat layer on the bonding surface of the optical film 10 and/or the bonding surface of the adhesive layer 20, or to apply a surface activation treatment such as electricity. Pulp treatment, corona treatment, etc., to perform corona treatment is more preferable.

When the optical film 10 is a single-sided protective polarizing plate as shown in Fig. 2, it is usually a surface on the opposite side of the polarizing plate surface, that is, the first resin film 3 in the polarizing plate 2, and it is preferable to directly deposit an adhesive. Layer 20. When the optical film 10 is a double-sided protective polarizing plate as shown in FIG. 3, the adhesive layer 20 may be applied to any of the first and second resin films 3 and 4, or may be applied to the outer layer of the two layers. Layer 20.

An antistatic layer may be additionally provided between the optical film 10 and the adhesive layer 20. However, since the adhesive layer 20 of the present invention can provide excellent antistatic property by the adhesive layer alone, the film of the optical laminate is used. The simplification of the step of fabricating or laminating the film is preferably such that the anti-static layer is not provided between the optical film 10 and the adhesive layer 20.

The optical film 1 to which the adhesive layer is attached may also contain a separation film (release film) laminated on the outer surface of the adhesive layer 20. This separation film is usually removed by peeling off when the adhesive layer 20 is used (for example, when laminated on the metal layer 30). The separation membrane system can form a coating on the surface of the adhesive layer 20, for example, a film made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, or polyarylate. Oxygen treatment isolating processor.

The optical film 1 with an adhesive layer is formed by dissolving or dispersing the components constituting the above-mentioned adhesive composition in a solvent to form a solvent-containing adhesive composition, and then applying it to the surface of the optical film 10 to dry and form an adhesive. The agent layer 20 can be obtained. Further, the optical film 1 with an adhesive layer can be formed by laminating (transferring) the adhesive layer 20 on the surface of the optical film 10 by forming the adhesive layer 20 in the same manner as described above. Got it.

The optical layer 1 of the adhesive layer may be bonded through the adhesive layer 20 on the metal layer 30 (or the above resin layer) to obtain an optical laminate. When the optical film 1 and the metal layer 30 with the adhesive layer are bonded to each other to form an optical laminate, if any of the optical layers are not preferable, the optical film 1 with the adhesive layer may be peeled off from the metal layer 30, and then the other may be peeled off. The optical film 1 with the adhesive layer is reattached to the metal layer 30, and there is a so-called heavy work. In the optical layering system of the present invention, the surface of the metal layer 30 after the optical film 1 with the adhesive layer is peeled off from the metal layer 30 is less likely to cause fogging or residue, and is excellent in reworkability. According to the optical layered body of the present invention, the surface of the adhesive layer 20 is not the metal layer 30, and the glass substrate or the ITO layer can exhibit good reworkability.

<Liquid crystal display device>

The liquid crystal display device of the present invention contains the above-described optical laminate of the present invention. The liquid crystal display device of the present invention can suppress corrosion of the metal layer 30 and exhibit good durability.

The liquid crystal display device of 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 one of the conventional methods such as an out cell type, an on cell type, and an in cell type, and the operation mode of the touch panel is Any of the conventionally known methods such as a resistive film method and an electrostatic capacitance method (surface type electrostatic capacitance method or projection type electrostatic capacitance method) may be used. The optical layering system of the present invention can be disposed on the viewing side of the touch input element (liquid crystal cell), can be disposed on the backlight side, or can be disposed on both sides. The driving method of the liquid crystal cell may be any one of conventionally known methods 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 of the present invention, the substrate 40 included in the optical layered body may be a substrate (typically a glass substrate) included in the liquid crystal cell.

[Examples]

Hereinafter, the present invention will be more specifically described by showing examples and comparative examples, but the present invention is not limited thereto. Hereinafter, the amount of use, the amount of the content, and the % are based on the weight unless otherwise stated.

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

Into a reaction vessel equipped with a cooling tube, a nitrogen gas introduction tube, a thermometer, and a stirrer, a solution obtained by mixing a monomer having a composition shown in Table 1 (amount in Table 1 in parts by weight) and 81.8 parts of ethyl acetate was added. After the air in the reaction vessel was replaced with nitrogen, the internal temperature was made 60 °C. Thereafter, a solution obtained by dissolving 0.12 parts of azobisisobutyronitrile in 10 parts of ethyl acetate was added. After maintaining at the same temperature for 1 hour, the internal temperature was maintained at 54 to 56 ° C, and ethyl acetate was continuously added to the reaction vessel at a rate of addition of 17.3 parts/Hr to a concentration of the polymer of about 35%. The internal temperature was maintained at 54 to 56 ° C after 12 hours from the addition of ethyl acetate, and ethyl acetate was added to adjust the concentration of the polymer to 20% to obtain a (meth)acrylic resin ( A-1) ethyl acetate solution. The weight average molecular weight Mw of the (meth)acrylic resin (A-1) was 1.39 million, and the ratio Mw/Mn of the weight average molecular weight Mw and the number average molecular weight Mn was 5.32. In the gel permeation chromatography (GPC) discharge curve, the composition of Mw 1.39 million represents a single peak, and no other peaks are seen in the range of Mw 1000 to 2.5 million.

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

An ethyl acetate solution (resin concentration: 20%) of the (meth)acrylic resin (A-2) was obtained in the same manner as in Production Example 1 except that the composition of the monomer was as shown in Table 1. The (meth)acrylic resin (A-2) had a weight average molecular weight Mw of 1.41 million and Mw/Mn of 4.71. In the GPC discharge curve, the composition of Mw 1.4 million shows a single peak, Mw 1000 to 2.5 million No other peaks are visible in the range.

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

The ethyl acetate solution (resin concentration: 20%) of the (meth)acrylic resin (A-3) was obtained in the same manner as in Production Example 1 except that the composition of the monomer was as shown in Table 1. The (meth)acrylic resin (A-3) had a weight average molecular weight Mw of 750,000 and an Mw/Mn of 5.02. In the GPC discharge curve, the composition of Mw75 million shows a single peak, and no other peaks are seen in the range of Mw1000 to 2.5 million.

In the above-mentioned production example, the weight average molecular weight Mw and the number average molecular weight Mn are four "TSKgel XL" manufactured by Tosoh Corporation and "Shodex GPC KF-802" manufactured by Showa Denko Co., Ltd. in the GPC apparatus. A total of five roots were connected in series as a column, and tetrahydrofuran was used as the elution solution, and the sample concentration was 5 mg/mL, the sample introduction amount was 100 μL, the temperature was 40 ° C, and the flow rate was 1 mL/min, and the measurement was carried out by standard polystyrene conversion. The conditions for producing the GPC discharge curve are also the same.

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

The composition of the monomers in each of the production examples (the 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 discharge curve (in Table 1, the number of "GPC peaks" is summarized) in FIG. 1.

The abbreviation in the column of "monomer composition" in Table 1 means 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 (homopolymer) Glass transition temperature: -50 ° C), HEA: 2-hydroxyethyl acrylate.

AM: acrylamide, M-90G: methoxypolyethylene glycol #400 methacrylate (EO 9 mol), taken from the brand name "M-90G" of Shin-Nakamura Chemical Industry Co., Ltd.

<Examples 1 to 9 and Comparative Example 1>

(1) Modulation of adhesive composition

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

The contents of the respective components indicated by the abbreviation in Table 2 are as follows.

(isocyanate crosslinking agent)

B-1: an ethyl acetate solution of a trimethylolpropane adduct of xylene diisocyanate (solid content concentration: 75%), and a trade name "Takenate D-110N" from Mitsui Chemicals Co., Ltd.

(decane compound)

C-1: 3-glycidoxypropyltrimethoxydecane, trade name "K BM403" 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.

The "solubility" in Table 2 is the solubility (g) of the ionic compound (D) of 100 g of water at 60 °C. The solubility was determined in the following order. First, 100 mg of the ionic compound of the fine scale and 2 mL of pure water were mixed, and then stored under stirring at a temperature of 60 ° C for 24 hours. When the obtained ionic compound contains a solvent, the solvent can be distilled off under reduced pressure to obtain a dry solid ionic compound, which is then weighed. Then, a part of the water layer (fine weighing amount) is sampled, and after appropriately diluted with acetonitrile, the weight concentration of the ionic compound dissolved in the obtained measurement sample is determined by liquid chromatography (LC/MS). Absolute calibrated line method to quantify. The measurement conditions of LC/MS are as follows. The solubility of the ionic compound (D) was determined based on the quantitative results.

Analytical device: Agilent Technologies LC/MS device type 1260/6130

Separation column: Kinetex 2.6u C18 100A (3.0×100mm, 2.7μm)

Mobile phase: gradient method of adding 0.05% TFA water/acetonitrile mixed solvent

Mobile phase flow: 0.5mL/min.

Sample injection amount: 2.5 μL

Oven temperature: 40 ° C

UV detection wavelength: 254nm

MS detection conditions: Electrospray ionization (ESI) method Positive.

Further, for the ionic compounds D-1 to D-5 and the D-7 system UV detector (wavelength 254 nm), the ionic compound D-6 was quantified by the selective ion detection (SIM) mode of the MS detector ( Detection quality m/z = 114).

(2) The layer of adhesive layer

A thin coater (applicator) is used for the release film of the separation film composed of the polyethylene terephthalate film subjected to the release treatment [taken from the brand name "PLR-382051" of Lintec Co., Ltd.]. The adhesive composition prepared in the above (1) was applied so as to have a thickness of 20 μm after drying, and dried at 100 ° C for 1 minute to prepare an adhesive layer (adhesive sheet).

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

A polyvinyl alcohol film having an average polymerization degree of about 2,400, a saponification degree of 99.9 mol%, and a thickness of 60 μm [Kuraray Vinylon, manufactured by Kuraray Co., Ltd. VF-PE #6000"] was immersed in pure water at 37 ° C, and then immersed in an aqueous solution containing iodine and potassium iodide (iodine / potassium iodide / water (weight ratio) = 0.44 / 1.5 / 100) at 30 ° C. Thereafter, it was immersed in an aqueous solution containing potassium iodide and boric acid (potassium iodide/boric acid/water (weight ratio) = 12/3.6/100) at 56.5 °C. The film was washed with pure water at 10 ° C, and then dried at 85 ° C to obtain a polarizer having a thickness of about 23 μm in the form of iodine adsorbed on polyvinyl alcohol. The extension is mainly carried out in the steps of iodine dyeing and boric acid treatment, and the overall stretching ratio is 5.3 times.

A transparent protective film made of a triethylenesulfonated cellulose film having a thickness of 25 μm is applied to a single surface of the obtained polarizer through an adhesive composed of an aqueous solution of a polyvinyl alcohol resin [Konica Minolta Opto Co., Ltd. Product name "KC2UA"]. Then, on the opposite side of the triacetyl cellulose film of the polarizer, a layer of a cyclic polyolefin resin having a thickness of 23 μm is bonded by an adhesive composed of an aqueous solution of a polyvinyl alcohol resin. A retardation film [trade name "ZEONOR" manufactured by Zeon, Japan) was used to produce a polarizing plate. Then, on the opposite side of the surface of the zero retardation film that is in contact with the polarizer, after applying the corona discharge treatment for improving the adhesion, the adhesive prepared by the above (2) is bonded by a laminator. After the separation membrane of the layer was on the opposite side (adhesive layer), it was aged at a temperature of 23 ° C and a relative humidity of 65% for 7 days to obtain an optical film (P-1) with an adhesive layer.

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

A polyvinyl alcohol film having an average polymerization degree of about 2400, a saponification degree of 99.9 mol%, and a thickness of 30 μm was immersed in pure water at 37 ° C under the trade name "Kuraray Vinylon VF-PE #3000" (manufactured by Kuraray Co., Ltd.). 30 ° C immersion in containing An aqueous solution of iodine and potassium iodide (iodine/potassium iodide/water (weight ratio) = 0.04/1.5/100). Thereafter, it was immersed in an aqueous solution containing potassium iodide and boric acid (potassium iodide/boric acid/water (weight ratio) = 12/3.6/100) at 56.5 °C. The film was washed with pure water at 10 ° C, and then dried at 85 ° C to obtain a polarizer having a thickness of about 12 μm in the form of iodine adsorbed on polyvinyl alcohol. The extension is mainly carried out in the steps of iodine dyeing and boric acid treatment, and the overall stretching ratio is 5.3 times.

A transparent protective film made of a triethylenesulfonated cellulose film having a thickness of 25 μm is applied to a single surface of the obtained polarizer through an adhesive composed of an aqueous solution of a polyvinyl alcohol resin [Konica Minolta Opto Co., Ltd. The product name "KC2UA"] was used to make a polarizing plate. Then, on the opposite side of the surface of the polarizer to which the protective film is bonded, and the surface of the adhesive layer of the adhesive layer prepared in the above (2) is bonded to the surface (adhesive layer) by a laminator. The film was aged for 7 days under the conditions of a temperature of 23 ° C and a relative humidity of 65% to obtain an optical film (P-2) with an adhesive layer.

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

The optical film (P-1) with the adhesive layer prepared in the above (3) was cut into a test piece having a size of 20 mm × 50 mm, and adhered to the metal layer side of the glass substrate with the metal layer through the adhesive layer. The glass substrate with a metal layer is a glass substrate (manufactured by Geomatec Co., Ltd.) in which a metal aluminum layer having a thickness of about 500 nm is deposited by sputtering on the surface of the alkali-free glass. After the obtained optical laminate was stored in an oven at a temperature of 60 ° C and a relative humidity of 90% for 500 hours, the state of the metal layer adhered to the portion of the optical film to which the adhesive layer was attached was irradiated with light from the back surface of the glass substrate. Observed from the surface of the polarizer via a magnifying glass The etch (the diameter of 0.1 mm or more and the permeable light hole) was evaluated on the basis of the following. 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 More than one, 1: a large number of pittings are generated on the surface of the metal layer, and white turbidity is also generated.

(6) Durability evaluation of optical film with adhesive layer

The optical film (P-1) with the adhesive layer produced in the above (3) is cut into a size of 200 mm × 150 mm so that the direction of the extension axis of the polarizing plate becomes a long side, and the separation film is peeled off to adhere the exposed film. The agent layer is attached to the glass substrate. The obtained test piece to which a glass substrate was adhered (an optical film to which an adhesive layer of a glass substrate was adhered) was pressurized in an autoclave at a temperature of 50 ° C and a pressure of 5 kg/cm ² (490.3 kPa) for 20 minutes. For the glass substrate, the alkali-free glass product name "Eagle XG" manufactured by Corning Incorporated was used. For the obtained optical laminate, the following three durability tests were carried out.

[Endurance test]

‧ 750 hours of heat resistance test under dry conditions at 85 ° C, 750 hours of humidity resistance at 60 ° C, relative humidity of 90%, ‧ for 30 minutes at a temperature of 85 ° C, then At temperature The operation was maintained for 30 minutes under a dry condition of -40 ° C as 1 cycle, and this was repeated for 400 cycles of a thermal shock (HS) test.

The optical laminates after the test were visually observed, and the appearance changes such as floating, peeling, and foaming of the pressure-sensitive adhesive layer were visually observed, and the durability was evaluated in accordance with the following evaluation criteria. The results are shown in Table 3.

4: No change in appearance such as lifting, peeling, foaming, etc., 3: almost no appearance change such as floating, peeling, foaming, etc., 2: appearance change such as floating, peeling, foaming, etc., slightly conspicuous, 1 : Apparent changes in appearance such as lifting, peeling, and foaming are apparent.

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

The optical film (P-1) with the adhesive layer prepared in the above (3) was cut into a test piece having a size of 25 mm × 150 mm. The separation membrane was peeled off from the test piece, and the adhesive surface was attached to the glass substrate. The obtained test piece to which the glass substrate was attached (the optical film with the adhesive layer attached to the glass substrate) was pressurized in an autoclave at a temperature of 50 ° C and a pressure of 5 kg/cm ² (490.3 kPa) for 20 minutes. Then, it was stored in an oven at 50 ° C for 48 hours, and further, in an environment of a temperature of 23 ° C and a relative humidity of 50%, the optical film and the adhesive layer were peeled off from the test piece at a speed of 300 mm/min toward the 180° direction. . The state of the surface of the glass substrate after peeling was observed, and it evaluated on the following basis. The results are shown in Table 3.

4: No atomization or the like is observed on the surface of the glass substrate, and 3: no fogging is observed on the surface of the glass substrate. 2: Atomization or the like can be seen on the surface of the glass substrate. 1: The residue of the adhesive layer can be seen on the surface of the glass substrate.

<Production Example 4: Production of (meth)acrylic resin (A-1) for adhesive layer>

To a reaction vessel equipped with a cooling tube, a nitrogen gas introduction tube, a thermometer, and a stirrer, a solution obtained by mixing a monomer having a composition shown in Table 4 (amount in Table 4 in parts by weight) and 81.8 parts of ethyl acetate was added. After the air in the reaction vessel was replaced with nitrogen, the internal temperature was made 60 °C. Thereafter, a solution obtained by dissolving 0.12 parts of azobisisobutyronitrile in 10 parts of ethyl acetate was added. After maintaining at the same temperature for 1 hour, the internal temperature was maintained at 54 to 56 ° C while the ethyl acetate was added to make the concentration of the polymer at an addition rate of 17.3 parts/Hr. It was continuously added to the reaction vessel in a manner of about 35%. The internal temperature was maintained at 54 to 56 ° C after 12 hours from the addition of ethyl acetate, and ethyl acetate was added to adjust the concentration of the polymer to 20% to obtain a (meth)acrylic resin ( A-1) ethyl acetate solution. The weight average molecular weight Mw of the (meth)acrylic resin (A-1) was 1.39 million, and the ratio Mw/Mn of the weight average molecular weight Mw and the number average molecular weight Mn was 5.32. In the gel permeation chromatography (GPC) discharge curve, the composition of Mw 1.39 million shows a single peak, and no other peaks are seen in the range of Mw 1000 to 2.5 million.

In the above-mentioned production example, the weight average molecular weight Mw and the number average molecular weight Mn are four "TSKgel XL" manufactured by Tosoh Corporation and "Shodex GPC KF-802" manufactured by Showa Denko Co., Ltd. in the GPC apparatus. A total of five roots were connected in series as a column, and tetrahydrofuran was used as the elution solution, and the sample concentration was 5 mg/mL, the sample introduction amount was 100 μL, the temperature was 40 ° C, and the flow rate was 1 mL/min, and the measurement was carried out by standard polystyrene conversion. The conditions for producing the GPC discharge curve are also the same.

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

The composition of the monomer in Production Example 4 (the value in Table 4 is part by weight), and the number of peaks in the range of Mw of 1,000 to 2.5 million on the discharge curve of GPC (in Table 4, the number of "GPC peaks" is summarized) In Table 4.

The abbreviation of the column of "monomer composition" in Table 4 means the following monomers.

BA: butyl acrylate (glass transition temperature of homopolymer: -54 ° C), MA: methyl acrylate (glass transition temperature of homopolymer: 10 ° C), HEA: 2-hydroxyethyl acrylate.

<Examples 10 to 14, Comparative Example 2>

(1) Modulation of adhesive composition

In the ethyl acetate solution (resin concentration: 20%) of the (meth)acrylic resin obtained in Production Example 4, the isocyanate crosslinking agent shown in Table 5 was added to 100 parts of the solid content of the solution ( B), the decane compound (C) and the ionic compound (D) were each mixed in an amount (parts by weight) shown in Table 5, and an ethyl acetate was added so that the solid content concentration was 14% to prepare an adhesive. Composition. When the product to be used contains a solvent or the like, the compounding amount of each component shown in Table 5 is the parts by weight of the active ingredient contained therein.

The contents of the respective compounding ingredients shown by the abbreviation in Table 5 are as follows.

(isocyanate crosslinking agent)

B-1: an ethyl acetate solution of a trimethylolpropane adduct of xylene diisocyanate (solid content concentration: 75%), and a trade name "Takenate D-110N" from Mitsui Chemicals Co., Ltd.

(decane compound)

C-1: 3-glycidoxypropyltrimethoxydecane, and the trade name "K BM403" of the chemical industry (share).

(ionic compound)

D-1: N-propylpyridinium bis(fluorosulfonyl)imide, D-3: N-decylpyridinium bis(fluorosulfonyl)imide, D-6: 1-ethyl-1 -methylpyrrolidinium bis(trifluoromethanesulfonyl) Imine, D-7: N-methylpyridinium bis(fluorosulfonyl)imide.

The "solubility" in Table 5 is the solubility (g) of the ionic compound (D) of 100 g of water at 60 °C. The solubility was determined in the following order. First, 100 mg of the ionic compound of the fine scale and 2 mL of pure water were mixed, and then stored under stirring at a temperature of 60 ° C for 24 hours. When the obtained ionic compound contains a solvent, the solvent can be distilled off under reduced pressure to obtain a dry solid ionic compound, which is then weighed. Then, a part of the water layer (fine weighing amount) is sampled, and after appropriately diluted with acetonitrile, the weight concentration of the ionic compound dissolved in the obtained measurement sample is determined by liquid chromatography (LC/MS). Absolute calibrated line method to quantify. The measurement conditions of LC/MS are as follows. The solubility of the ionic compound (D) was determined based on the quantitative results.

Analytical device: Agilent Technologies LC/MS device type 1260/6130

Separation column: Kinetex 2.6u C18 100A (3.0×100mm, 2.7μm)

Mobile phase: gradient method of adding 0.05% TFA water/acetonitrile mixed solvent

Mobile phase flow: 0.5mL/min.

Sample injection amount: 2.5 μL

Oven temperature: 40 ° C

UV detection wavelength: 254nm

MS detection conditions: Electrospray ionization (ESI) method Positive.

Further, the ionic compounds D-1, D-3 and D-7 were carried out by a UV detector (wavelength 254 nm) and an ionic compound D-6 by a selective ion detection (SIM) mode of an MS detector. Quantitative m/z = 114).

(2) Production of adhesive layer

Using a thin coater to form a separation membrane composed of a polyethylene terephthalate film subjected to release treatment [taken from the trade name "PLR-382051" of Lintec Co., Ltd.] The adhesive composition prepared in the above (1) was applied so as to have a thickness of 20 μm after drying, and dried at 100 ° C for 1 minute to prepare an adhesive layer (adhesive sheet).

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

A polyvinyl alcohol film having an average polymerization degree of about 2400, a degree of saponification of 99.9 mol%, and a thickness of 60 μm, which is a product of Kuraray Vinylon VF-PE #6000, manufactured by Kuraray, was immersed in pure water at 37 ° C, and then Immersed in an aqueous solution containing iodine and potassium iodide at 30 ° C (iodine / potassium iodide / water (weight ratio) = 0.04 / 1.5 / 100). Thereafter, it was immersed in an aqueous solution containing potassium iodide and boric acid (potassium iodide/boric acid/water (weight ratio) = 12/3.6/100) at 56.5 °C. The film was washed with pure water at 10 ° C, and then dried at 85 ° C to obtain a polarizer having a thickness of about 23 μm in the form of iodine adsorbed on polyvinyl alcohol. The extension is mainly carried out in the steps of iodine dyeing and boric acid treatment, and the overall stretching ratio is 5.3 times.

A transparent protective film made of a triethylenesulfonated cellulose film having a thickness of 25 μm is adhered to an adhesive made of an aqueous solution of a polyvinyl alcohol resin on one side of the obtained polarizer [Konica Minolta Opto Co., Ltd. Name "KC2UA"]. Then, an aqueous solution of a polyvinyl alcohol-based resin is passed through the surface opposite to the triacetyl cellulose film in the polarizer. A polarizing film made of a cyclic polyolefin resin having a thickness of 23 μm (trade name "ZEONOR" manufactured by Zeon Co., Ltd.) was bonded to the adhesive to form a polarizing plate. Then, on the opposite side to the surface in contact with the polarizer in the zero retardation film, after applying a corona discharge treatment for improving adhesion, the adhesive is bonded to the above (2) by a laminator. After the separation film of the agent layer was on the opposite side (adhesive layer), it was aged at a temperature of 23 ° C and a relative humidity of 65% for 7 days to obtain an optical film (P-1) with an adhesive layer.

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

(4-1) Cases of Examples 10 to 11 and Comparative Example 2

The optical film (P-1) with the adhesive layer prepared in the above (3) was cut into a test piece of 20 mm × 50 mm, and attached to the metal layer side of the glass substrate with the metal layer through the adhesive layer. The glass substrate with a metal layer is a glass substrate (manufactured by Geomatec Co., Ltd.) in which a metal copper layer having a thickness of about 500 nm is deposited by sputtering on the surface of the alkali-free glass. After the obtained optical laminate was stored in an oven at a temperature of 60 ° C and a relative humidity of 90% for 120 hours, the state of the metal layer of the adhesive portion of the optical film with the adhesive layer was irradiated with light from the back surface of the glass substrate to be polarized. The surface of the plate was observed through a magnifying glass, and pitting corrosion (the occurrence of a hole having a diameter of 0.1 mm or more and permeable to light) was evaluated on the following basis. The results are shown in Table 6.

(4-2) Cases of Embodiments 12 to 14

The optical film (P-1) with the adhesive layer prepared in the above (3) was cut into a test piece of 20 mm × 50 mm, and attached to the metal layer through the adhesive layer. The metal layer side of the glass substrate. A glass substrate with a metal layer is a glass substrate (manufactured by Geomatec Co., Ltd.) which is a layer of a silver alloy (a component containing silver and containing an alloy of Palladium and copper, APC) having a thickness of about 500 nm by sputtering on the surface of an alkali-free glass. ). After the obtained optical laminate was stored in an oven at a temperature of 60 ° C and a relative humidity of 90% for 500 hours, the state of the metal layer of the adhesive portion of the optical film with the adhesive layer was irradiated with light from the back surface of the glass substrate. The surface of the polarizing plate was observed through a magnifying glass, and pitting corrosion (the occurrence of a hole having a diameter of 0.1 mm or more and permeable to light) was evaluated on the following basis. The results are shown in Table 6.

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 More than one, 1: a large number of pittings are generated on the surface of the metal layer, and white turbidity is also generated.

1‧‧‧Optical film with adhesive layer

10‧‧‧Optical film

20‧‧‧Adhesive layer

30‧‧‧metal layer

40‧‧‧Substrate

Claims (23)

An optical layered body comprising an optical film, an adhesive layer and a metal layer in sequence, wherein the metal layer is a metal wiring layer, or a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less, the adhesive layer An ionic compound having a solubility of 100 g or less to 100 g of water at 60 ° C is contained. The optical layered body according to the first aspect of the invention, wherein the metal layer is a metal wiring layer having a metal wiring having a line width of 10 μm or less. The optical layered product according to claim 1, wherein the anion of the ionic compound is an imine anion containing a fluorine atom. The optical layered product according to claim 1, wherein the anion of the ionic compound is a bis(fluorosulfonyl)imide anion or a bis(trifluoromethanesulfonyl)imide anion. The optical layered product according to claim 1, wherein the anion of the ionic compound is a bis(fluorosulfonyl)imide anion. An optical layered body comprising an optical film, an adhesive layer and a metal layer in sequence, wherein the metal layer is a metal wiring layer, or a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less, the adhesive layer It contains an ionic compound represented by 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, R ³ represents a hydrocarbon group having 4 to 20 carbon atoms which may contain a hetero atom, and X ^- represents fluorine. Amine anion of an atom. The optical laminate according to claim 6, wherein the R ³ carbon number of the above formula (I) is 4 or 5. An optical layered body comprising an optical film, an adhesive layer and a metal layer in sequence, wherein the metal layer is a metal wiring layer, or a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less, the adhesive layer It contains an ionic compound represented by the following formula (II): In the formula, R ⁴ represents an alkyl group having a linear or branched structure of 3 to 16 carbon atoms, and R ⁵ to R ⁹ each independently represent a hydrogen atom, an alkyl group which may have a substituent, and an alkyl group which may have a substituent. a group, an alkynyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring with each other, The X ^- line means the same meaning as described above. The optical layered body according to claim 8, wherein R ⁵ to R ⁹ of the above formula (II) each independently represent a hydrogen atom or a linear or branched alkyl having a carbon number of 1 to 16. base. The optical layered body according to any one of claims 6 to 9, wherein the X ^- based bis(fluorosulfonyl)imide anion or bis(trifluoromethanesulfonyl)imide anion. The optical layered body according to any one of claims 6 to 9, wherein the X ^- based bis(fluorosulfonyl)imide anion. The optical layered product according to the first aspect, wherein the adhesive layer further contains a (meth)acrylic resin, and the (meth)acrylic resin contains a homopolymer. The glass transition temperature is a constituent unit of the alkyl acrylate (a1) which is less than 0 ° C, and a constituent unit derived from an alkyl acrylate (a2) having a glass transition temperature of 0 ° C or higher derived from a homopolymer. The optical layered product according to claim 12, wherein the content of the constituent unit derived from the alkyl acrylate (a2) of the (meth)acrylic resin is constituting the (meth)acrylic resin. 10 parts by weight or more of 100 parts by weight of the total constituent unit. The optical layered product according to claim 12, wherein the alkyl acrylate (a2) contains methyl acrylate. The optical layered body according to the first aspect, wherein the metal layer contains one or more selected from the group consisting of aluminum, copper, silver, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, and lead. And a group consisting of an alloy containing two or more kinds of metals selected from these. The optical layered body according to claim 1, wherein the metal layer contains an aluminum element. A liquid crystal display device comprising the optical layered body described in claim 1, item 6, or item 8. An adhesive composition for forming an adhesive layer for laminating on a metal layer, the metal layer being a metal wiring layer, or a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less. The adhesive composition contains a (meth)acrylic resin and an ionic compound, and the ionic compound has a solubility of 100 g or less for water of 60 ° C of 6 g or less. An adhesive composition for forming an adhesive layer for laminating on a metal layer, the metal layer being a metal wiring layer, or a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less. The adhesive composition contains a (meth)acrylic resin and an ionic compound, and the ionic compound is an ionic compound represented by 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, R ³ represents a hydrocarbon group having 4 to 20 carbon atoms which may contain a hetero atom, and X ^- represents fluorine. Amine anion of an atom. An adhesive composition for forming an adhesive layer for laminating on a metal layer, the metal layer being a metal wiring layer, or a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less The adhesive composition contains a (meth)acrylic resin and an ionic compound, and the ionic compound is an ionic compound represented by the following formula (II): In the formula, R ⁴ represents an alkyl group having a linear or branched structure of 3 to 16 carbon atoms, and R ⁵ to R ⁹ each independently represent a hydrogen atom, an alkyl group which may have a substituent, and an alkyl group which may have a substituent. a group, an alkynyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring with each other; The X ^- line means the same meaning as described above. An optical film with an adhesive layer comprising an optical film and an adhesive layer laminated on at least one side of the optical film, and an adhesive layer for bonding to the metal layer through the adhesive layer In the optical film, the metal layer is a metal wiring layer, a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less, and the adhesive layer contains an ionic compound having a solubility of 100 g or less per 100 g of water at 60° C. . An optical film with an adhesive layer comprising an optical film and an adhesive layer laminated on at least one side of the optical film, and an adhesive layer for bonding to the metal layer through the adhesive layer In the optical film, the metal layer is a metal wiring layer, a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less, and the adhesive layer contains an ionic compound represented by 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 represents a hydrocarbon group having 4 to 20 carbon atoms which may contain a hetero atom, and X ^- represents An imine anion containing a fluorine atom. An optical film with an adhesive layer comprising an optical film and an adhesive layer laminated on at least one side of the optical film, and an adhesive layer for bonding to the metal layer through the adhesive layer In the optical film, the metal layer is a metal wiring layer, a layer formed by sputtering, or a metal layer having a thickness of 3 μm or less, and the adhesive layer contains an ionic compound represented by the following formula (II): In the formula, R ⁴ represents an alkyl group having a linear or branched structure of 3 to 16 carbon atoms, and R ⁵ to R ⁹ each independently represent a hydrogen atom, an alkyl group which may have a substituent, and an alkyl group which may have a substituent. a group, an alkynyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic group which may have a substituent, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring with each other; The X ^- line means the same meaning as described above.