TW201700289A - Optical laminate and liquid crystal display device - Google Patents

Abstract

The present invention provides an optical laminate, and a liquid crystal display device including the optical laminate. The optical laminate in sequence comprises an optical film, an adhesive layer and a metal layer. The adhesive layer is formed of an adhesive composition containing a (meth)acrylic resin (A), a silane compound (B) and an ionic compound (C), wherein the silane compound (B) is a silane compound represented by the formula (I).

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. For example, an optical film of a polarizing plate is used by being bonded to another member (for example, a liquid crystal cell of a liquid crystal display device) via 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, it is also known to impart an antistatic property and to contain an ionic compound in the adhesive layer.

In recent years, liquid crystal display devices have been developed for use in portable machines having a touch panel function represented by smart phones, desktop terminals, and car navigation systems. Touch input type liquid crystal display device An optical film having an adhesive layer attached thereto, and the adhesive layer is also disposed, for example, in a metal layer composed of, for example, metal wiring via a resin layer or 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 is corroded in a high-temperature and high-humidity environment. In the case of corrosion, especially pitting, in the case where the thickness of the metal layer is thin, and when the metal layer is metal wiring and the line width is narrow, the pitting will completely penetrate the metal layer, which is particularly problematic.

An object of the present invention is to provide an optical layering apparatus capable of suppressing corrosion of a metal layer and an optical film comprising the optical layered body, wherein the optical layering system laminates an optical film of an adhesive layer on a metal layer such as a metal wiring layer Laminated body.

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

[1] An optical laminate comprising, in order, an optical film, an adhesive layer, and a metal layer; the adhesive layer comprising (meth)acrylic resin (A), a decane compound (B), and an ionic compound The adhesive composition of (C); the decane compound (B) is a decane compound represented by the following formula (I):

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

[2] The optical layered body according to [1], wherein the metal layer comprises: aluminum, copper, silver, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead, and the like One or more selected from the group consisting of alloys of two or more kinds of metals.

[3] The optical layered body according to [1], wherein the metal layer contains an aluminum element.

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

[5] The optical layered product according to any one of [1] to [4] wherein the thickness of the metal layer is 3 μm or less.

[6] The optical layered product according to any one of the above [1], wherein the decane compound (B) represented by the above formula (I) is a decane compound represented by the following formula (II):

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

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

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

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

[10] The optical layered product according to any one of [1] to [9] wherein the decane compound (B) is 1,6-bis(trimethoxyindenyl)hexane.

The optical layered product according to any one of the above-mentioned (meth)acrylic resin (A), the above-mentioned (meth)acrylic resin (A) is 100 parts by weight of the aforementioned decane. The content of the compound (B) is from 0.01 to 10 parts by weight.

The optical layered product according to any one of the above aspects, wherein the (meth)acrylic resin (A) contains a constituent unit derived from a monomer having a hydroxyl group.

The optical layered product according to any one of the above aspects, wherein the (meth)acrylic resin (A) contains: the glass transition temperature derived from the homopolymer is less than 0 The constituent unit of the alkyl acrylate (a1) at °C and the constituent unit derived from the alkyl acrylate (a2) having a glass transition temperature of 0 ° C or higher derived from the homopolymer.

[14] The optical layered product according to any one of [1] to [13] wherein the (meth)acrylic resin (A) has a weight average molecular weight of from 500,000 to 2,500,000.

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

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

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

[18] An adhesive composition comprising a (meth)acrylic resin (A), a decane compound (B), and an ionic compound (C), wherein the decane compound (B) is a compound of the following formula (I) Shown decane compounds:

In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the -CH ₂ - system constituting the alkanediyl group and the alicyclic hydrocarbon group may be -O - or -C(=O)-substituted, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 5 carbon atoms. The base or an alkoxy group having 1 to 5 carbon atoms can be used for the formation of an adhesive layer laminated on the metal layer.

According to the invention, it is possible to provide an optical layered body capable of suppressing corrosion of a metal layer and a liquid crystal display device comprising the same.

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.

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 40. The optical layered body may be attached to the metal layer 30 formed on the substrate 40 via the adhesive layer 20, and the optical film 1 with the adhesive layer is attached to the optical film 1 of the adhesive layer. And the aforementioned 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, the optical film 1 with the adhesive layer is usually laminated on the metal layer 30 in such a manner that the adhesive layer 20 directly contacts the metal layer 30. According to the present invention, in such an optical layered body, the metal layer 30 can be effectively suppressed Corrosion. Hereinafter, the property of suppressing corrosion of the metal layer 30 is also referred to as "metal corrosion resistance".

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 contains a (meth)acrylic resin (A), a decane compound (B), and an ionic compound (C), and is preferably composed of an adhesive composition further containing an isocyanate crosslinking agent (D). Composition. The adhesive composition may further comprise other ingredients. In the present specification, "(meth)acrylic acid" means at least one selected from the group consisting of an acrylic group and a methacrylic group. The same applies to "(meth)acrylate" and "(meth)acrylonitrile".

[1] optical film

The optical film 10 of the optical layered product of the present invention is an optical member constituting the optical film 1 with an adhesive layer, and is an optical film (a film having optical characteristics) that can be 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 optical film of the multilayer structure include a polarizing plate and a phase difference plate. The polarizing plate in the present specification is a resin film or a resin layer in at least one area of the polarizer. The phase difference plate is a resin film or a resin layer in 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 further attached to the other side of the polarizing plate 2. A double-sided protective polarizing plate in which the second resin film 4 is laminated is laminated. The first and second resin films 3 and 4 can be bonded to the polarizer 2 via an adhesive layer or an adhesive layer (not shown). The polarizing plates 10a and 10b may include other films and layers other than the first and second resin films 3 and 4.

Examples of the layer 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 has a linear polarized light that absorbs a vibrating surface parallel to its absorption axis, and penetrates a film having a property of linearly polarized light having a vibrating surface orthogonal to the absorption axis (parallel to the transmission axis), and can be used, for example, for polyethylene. The alcohol resin film adsorbs a film having 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. Examples of the polyvinyl acetate-based resin include, in addition to the polyvinyl acetate of a homopolymer of vinyl acetate, a copolymer of a monomer copolymerizable with vinyl acetate and vinyl acetate. Examples of the monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids and olefins. Vinyl ether, unsaturated sulfonic acid, (meth) acrylamide having an ammonium group, and 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, an aldehyde-modified polyvinyl formaldehyde or a polyvinyl acetal 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 an original film of the polarizer 2. The polyvinyl alcohol-based resin can be formed into a film by a known method. The thickness of the original film is usually from 1 to 150 μm, and is preferably 10 μm or more in consideration of easiness of stretching or the like.

The polarizer 2 is, for example, a step of axially stretching the original film, a step of dyeing the film with a dichroic dye to adsorb the dichroic dye, a step of treating the film with an aqueous solution of boric acid, and a step of washing the film, and finally, Made by drying. 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 thinning of the optical film 1 with an adhesive layer.

The polarizer 2 obtained by adsorbing a dichroic dye to a polyvinyl alcohol-based resin film can be obtained by the method of the following 2) in addition to the method of the following 1). The method of the above 1) is a method in which a single film of a polyvinyl alcohol-based resin film is used as an original film, and a film is subjected to a one-axis stretching treatment and a dyeing treatment of a dichroic dye; and the method of the second method is: A coating liquid (aqueous solution or the like) containing a polyvinyl alcohol-based resin is applied to a material film, and dried to obtain a base film having a polyvinyl alcohol-based resin layer, and the base film is entirely A method of performing one-axis stretching, applying a dye treatment to the stretched polyvinyl alcohol-based resin layer to a dichroic dye, and then peeling off the substrate film. As the base film, a film containing a thermoplastic resin similar to the thermoplastic resin capable of constituting the first and second resin films 3 and 4 to be described later can be used, and a polyester resin such as polyethylene terephthalate is preferably used. A film such as a polycarbonate resin such as a polycarbonate resin or triethyl fluorenyl cellulose, a cyclic polyolefin resin such as a decyl olefin resin, or a polystyrene resin. According to the method of the above 2), the polarizer 2 of the film can be easily produced, and for example, the polarizer 2 having a thickness of 7 μm or less can be easily produced.

The first and second resin films 3 and 4 are each independently translucent, and are preferably an optically transparent thermoplastic resin, and may be, for example, a chain-like polyolefin resin (polyethylene resin, polypropylene). 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) Ester, polyethylene naphthalate, polybutylene terephthalate, etc.; polycarbonate resin; (meth)acrylic resin; polystyrene resin; polyether ether ketone resin; A resin, or a film of such a mixture, copolymer or the like. The first and second resin films 3 and 4 are each composed of a cyclic polyolefin resin, a polycarbonate resin, a cellulose resin, a polyester resin, and a (meth)acrylic resin. The resin to be selected is preferably a resin, and is preferably composed of a resin selected from the group consisting of a cellulose resin and a cyclic polyolefin resin.

The chain-like polyolefin resin is exemplified by two kinds of homopolymers of a chain olefin such as a polyethylene resin or a polypropylene resin. A copolymer composed of the above chain olefins.

The cyclic polyolefin-based resin is a general term for a resin containing a cyclic olefin as a polymerized unit, which is represented by nortzene or tetracyclododecene (alias: dimethanooctahydronaphthalene) or such derivatives. . Specific examples of the cyclic polyolefin-based resin include a ring-opened (co)polymer of a cyclic olefin and a hydrogenated product thereof, an addition polymer of a cyclic olefin, and a cyclic olefin such as ethylene or propylene. A copolymer of a chain olefin or an aromatic compound having a vinyl group, and a modified (co)polymer modified with the unsaturated carboxylic acid and a derivative thereof. Among them, a decylene-based resin obtained by using a decylene-based monomer such as a norbornene or a polycyclopentazene-based monomer as a cyclic olefin is preferable.

The cellulose resin is preferably a cellulose ester resin, that is, a partially or fully esterified cellulose, and the like, and examples thereof include cellulose acetate, propionate, butyrate, and mixed esters thereof. Wait. Among them, triethylenesulfonyl cellulose, diethyl cellulose, cellulose acetate propionate, cellulose acetate butyrate or the like is preferably used.

The polyester-based resin is a resin other than the cellulose ester-based resin having an ester bond, and is generally composed of a polycondensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol. Specific examples of the polyester resin include: polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate Diester, propylene naphthalate, dimethyl dimethyl terephthalate, cyclohexane dimethyl phthalate.

The polycarbonate resin is made of carbonic acid and glycol or A polyester formed from 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, for example, 2,2-bis(4-hydroxyphenyl)propane (alias bisphenol A), 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis (4- A polycarbonate derived from bisphenol of hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)isobutane, 1,1-bis(4-hydroxyphenyl)ethane.

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, 50% by weight or more of the constituent unit). A copolymer which copolymerizes the above polymer with other copolymerization components is preferred. The (meth)acrylic resin may contain two or more constituent units derived from methacrylate. The methacrylate may, for example, be a C ₁ to C ₄ alkyl methacrylate such as methyl methacrylate, ethyl methacrylate or butyl methacrylate.

The copolymerizable component which can be copolymerized with a methacrylate is 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 citraconic anhydride; an unsaturated quinone imine such as phenyl maleimide or cyclohexylmaleimine; and one polymerization in the molecule. 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.

The (meth)acrylic resin may have a ring structure in the polymer main chain in terms of improving the durability of the film. 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 a glutaric anhydride structure and a succinic anhydride structure, and specific examples of the cyclic quinone imine structure include a pentylene imine structure and an amber quinone structure, and specific examples of the lactone ring structure. The butyrolactone ring structure and the valerolactone ring structure are listed.

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 having an acrylate as a main component and an elastic polymer as an essential component, and may be a single layer structure composed of only the elastic polymer and a multilayer polymer layer having one layer. Constructor. Examples of the elastic polymer include a crosslinked elastic copolymer obtained by copolymerizing an alkyl acrylate as a main component and copolymerizing with another vinyl monomer and a crosslinkable monomer copolymerizable with the main polymer. 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 monomers copolymerizable with an alkyl acrylate may, for example, be a compound having one polymerizable carbon-carbon double bond in the molecule, and more specifically, a methyl group such as methyl methacrylate Acrylate, an aromatic vinyl compound such as styrene, such as (meth)acrylonitrile Vinyl cyanide compounds, etc. The crosslinkable single system may be a crosslinkable compound having at least two polymerizable carbon-carbon double bonds in the molecule, and more specifically, ethylene glycol di(meth)acrylate or dibutyl a (meth) acrylate of a polyhydric alcohol such as an alcohol di(meth)acrylate; an alkenyl ester of (meth)acrylic acid such as allyl (meth)acrylate; divinylbenzene or the like.

The content of the acrylic rubber particles is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, based on 100 parts by weight of the (meth)acrylic resin. When the content of the acrylic rubber particles is too large, the surface hardness of the film is lowered, and when the film is subjected to surface treatment, the solvent resistance of 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.

Examples of the ultraviolet absorber include a salicylate compound, a benzophenone compound, a benzotriazole compound, and 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 an unstretched film or a film extending through one axis or two axes. The two-axis extension may be a simultaneous two-axis extension extending in two extending directions at the same time, or may be a successive two-axis extending in a predetermined direction and then extending in other directions. extend. The first resin film 3 and/or the second resin film 4 may be a protective film that serves to protect the polarizing film 2, or may have a protective film that has an optical function as a retardation film to be described later. The retardation film is an optical film that is optical anisotropy. For example, a film containing the thermoplastic resin may be stretched (one-axis stretching or biaxial stretching, etc.), a liquid crystal layer or the like may be formed on the thermoplastic resin film, thereby forming a retardation film imparted with 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 films made of mutually different thermoplastic resins. The first resin film 3 and the second resin film 4 may be the same in terms of the thickness, the presence or absence of the additive, the type, the phase difference characteristics, and the like, and may be different.

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, and an antistatic layer 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, and the optical film 1 and the optical layered body with the adhesive layer are thinned, and even the optical film 1 or the optical layered body having the adhesive layer is used. Thin film formation is advantageous.

In particular, in the case of a small-sized polarizing plate such as a smart phone or a desktop terminal, the thickness of the first resin film 3 and/or the second resin film 4 is preferably 30 μm or less. Thinner However, the polarizing plate does not have a weakening force for suppressing the contraction force of the polarizing plate 2, and the durability tends to be 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 means that the adhesive layer 20 can be suppressed in, for example, a high temperature environment, a high temperature and high humidity environment, a high temperature and a low temperature reversal environment. Properties such as floating and peeling of the interface of the optical member adjacent to the adhesive layer 20, foaming of the adhesive layer 20, and the like.

Further, from the viewpoint of thinning of the polarizing plate, it is advantageous to arrange the resin film only on one surface of the polarizing film 2 as in the case of the polarizing plate 10a shown in FIG. In this case, 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 thus constituted, 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 becomes particularly remarkable. 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 laminate having the adhesive layer having good optical durability (the property of suppressing deterioration of optical characteristics) can be provided. .

The first and second resin films 3 and 4 can be bonded to the polarizer 2 via an adhesive layer or an 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 be an adhesive containing a polyvinyl alcohol-based resin aqueous solution or an aqueous two-liquid urethane emulsion. Agents, etc. Among them, an aqueous binder containing a polyvinyl alcohol-based resin aqueous solution is particularly preferably used. The polyvinyl alcohol-based resin may be a copolymer of vinyl acetate and vinyl acetate in addition to a vinyl alcohol homopolymer obtained by saponifying a polyvinyl acetate homopolymer of vinyl acetate. A polyvinyl alcohol-based copolymer obtained by subjecting a copolymer of another monomer to a saponification treatment, or a modified polyvinyl alcohol-based polymer obtained by partially modifying the hydroxyl group. 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 preferable to carry out the step of drying the polarizer 2 after bonding the polarizer 2 to the first and second resin films 3 and 4 in order to remove water contained in the aqueous adhesive. 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 may be, for example, a curable composition containing a polymerizable compound or a photopolymerization initiator. A curable composition of a photoreactive resin, 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 is, for example, a photopolymerizable monomer such as a photocurable epoxy monomer, a photocurable (meth)acrylic monomer, or a photocurable urethane monomer, and is derived from light. An oligomer of a polymerizable monomer. The photopolymerization initiator may be one which contains an active species such as a neutral radical, an anionic radical, or a cationic radical by irradiation with an active energy ray. As a polymerizable compound and a photopolymerization initiator As the active energy ray-curable adhesive, a curable composition containing a photocurable epoxy-based monomer and a photocationic polymerization initiator, a photocurable (meth)acrylic monomer, and a light free can be preferably used. A curable composition of a base polymerization initiator, or a mixture of such hardenable 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 necessary, and then the active energy ray is irradiated to activate the active energy ray. A hardening step of energy ray hardening adhesive hardening. 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 fluorescent lamp, and a black light can be used. Lights, microwaves, mercury lamps, metal halide lamps, etc.

When the polarizer 2 and the first and second resin films 3 and 4 are bonded, at least one of the bonding surfaces can 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 for bonding the resin films may be the same kind of adhesive or a different type of adhesive.

The polarizing plates 10a and 10b may further contain other films or layers. 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 scratches and stains. For example, after the optical film 1 with the adhesive layer is bonded to, for example, the metal layer 30, Peel removal is performed.

The protective film is usually composed of a base film and an adhesive layer laminated on the base film. 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 polycarbonate. A resin; a (meth)acrylic resin or the like.

[1-2] phase difference plate

The retardation film contained in the retardation film is an optical film which exhibits optical anisotropy as described above, and may be a stretched film obtained by stretching a resin film to about 1.01 to 6 times, and the resin film may be used as a 1. The second resin film 3 and 4 are exemplified as the thermoplastic resin, and include, for example, a polyvinyl alcohol resin, a polyarylate resin, a polyimide resin, a polyether oxime resin, and a polydisperse. A vinyl fluoride/polymethyl methacrylate resin, a liquid crystal polyester resin, an ethylene-vinyl acetate copolymer saponified product, or a polyvinyl chloride resin. 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 are stretched by one axis or biaxially is preferable. Further, in the present specification, the retardation film also includes a zero retardation film (however, it can also be used as a protective film). Others, a film called a one-axis retardation film, a wide viewing angle retardation film, or a low photoelasticity retardation film can also be suitably used as the retardation film.

The zero-delay film means a film having an in-plane retardation value R _e and a thickness direction retardation value R _{th of} -15 to 15 nm. This retardation film can be suitably used for an IPS mode liquid crystal display device. The in-plane phase difference value R _e and the thickness direction phase difference value R _{th are} preferably -10 to 10 nm, more preferably -5 to 5 nm. Here, the in-plane phase difference value R _e and the thickness direction phase difference value R _th are values in the 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 acid can be used. A resin film composed of a resin. In particular, since it is easy to adjust the phase difference and it is easy to obtain, a cellulose resin, a polyolefin resin, or a (meth)acrylic resin can be suitably used.

Further, a film which exhibits optical anisotropy by coating/orientation of a liquid crystal compound or a film which exhibits optical anisotropy by application of an inorganic layered compound can be used as the retardation film. Such a retardation film is a method called a temperature-compensated retardation film, and a rod-shaped liquid crystal sold by JX Nippon Mining & Energy Co., Ltd. under the trade name "NH film" is obliquely oriented. Seiko Film, a film made of a disc-shaped liquid crystal sold by Fuji Film Co., Ltd. under the trade name "WV Film", which is oriented obliquely, and sold by Sumitomo Chemical Co., Ltd. under the trade name "VAC Film". Fully two-axis oriented film, also by Sumitomo Chemical Co., Ltd. The "new VAC film" is sold under the trade name of a two-axis oriented film.

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 (meth)acrylic resin (A), a decane compound (B), and an ionic compound (C). Preferably, the isocyanate crosslinking agent (D) is further contained. The decane compound (B) in the adhesive composition is a decane compound represented by the following formula (I):

In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the -CH ₂ - system constituting the alkanediyl group and the alicyclic hydrocarbon group may be -O - or -C(=O)-substituted, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 5 carbon atoms. Alkoxy groups having 1 to 5 carbon atoms.

According to 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, according to the adhesive layer 20 composed of the above-described adhesive composition, the optical film 1 and the optical laminate having the adhesive layer are directly attached to the polarizer 2 with an adhesive. The layer 20 is constructed to exhibit good optical durability.

The thickness of the adhesive layer 20 is usually 2 to 40 μm, and is preferably from the viewpoints of the durability of the optical film 1 and the optical laminate with the adhesive layer and the reworkability of the optical film 1 with the adhesive layer. 30 μm, more preferably 10 to 25 μm. Further, when the thickness of the adhesive layer 20 is 10 μm or more, the followability 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 reworkability 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. "The storage elastic modulus of 0.1 to 5 MPa in the temperature range of 23 to 80 ° C" means that the storage elastic modulus is a value within the above range at any of the temperatures in this range. The storage modulus is generally decreased as the temperature rises. Therefore, as long as the storage modulus at 23 ° C and 80 ° C falls within the above range, it can be regarded as the storage modulus in the above range in the above 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 a 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 group of the (meth)acrylic acid alkyl ester has a carbon number of preferably from 1 to 14, more preferably 1 Further, it is preferably from 1 to 8, and may be linear, branched or cyclic. The (meth)acrylic acid alkyl ester may be a (meth)acrylic acid alkyl ester containing a substituent such as a substituent-containing alkyl acrylate which is substituted with an alkyl group as described later. 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. Iso- and third-butyl esters, n- and iso-amyl acrylate, n- and iso-hexyl (meth)acrylate, cyclohexyl (meth)acrylate, n- and iso-(meth)acrylate Heptyl ester, n- and iso-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n- and iso-decyl (meth)acrylate, positive-and-isomeric (meth)acrylic acid - decyl ester, isobornyl (meth) acrylate (n- and iso-dodecyl methacrylate), 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 not less than 0 ° C and a Tg derived from a homopolymer. A constituent unit of an alkyl acrylate (a2) of 0 ° C or more. In the above case, it is advantageous in terms of improving the metal corrosion resistance and durability of the optical film 1 and the optical laminate of the adhesive layer. The Tg of the homopolymer of the alkyl acrylate may be, for example, a value of literature such as POLYMER HANDBOOK (Wiley-Interscience).

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

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. It is preferable that the alkyl acrylate (a1) contains n-butyl 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 (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 tri-butyl 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) is preferably methyl acrylate, cyclohexyl acrylate, isobornyl acrylate or the like, and preferably contains methyl acrylate. .

The constituent unit derived from the alkyl acrylate (a2) in the (meth)acrylic resin (A) from the viewpoint of metal corrosion resistance and durability of the optical film 1 and the optical laminate having the adhesive layer. The content is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, and still more preferably 20 parts by weight or more, based on 100 parts by weight of all constituent units of the (meth)acrylic resin (A). It is 25 parts by weight or more. Further, from the viewpoint of the followability and reworkability of the adhesive layer 20 to 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 only one constituent unit derived from the other monomer, or 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 include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 2-(2) (meth)acrylate. -Hydroxyethoxy)ethyl ester, 2-chloro-2-hydroxypropyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, diethylene glycol mono(meth)acrylate a monomer having a hydroxyl group; acryloylmorpholine, vinyl caprolactam, N-vinyl-2-pyrrolidone, vinylpyridine, tetrahydrofurfuryl (meth)acrylate, caprolactone modification Tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, glycidyl (meth)acrylate, 2,5-dihydrofuran Monomer having a heterocyclic group; aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, etc. a monomer having a substituted or unsubstituted amine group; 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 (meth)acrylate having a hydroxyl group is more preferable in terms of reactivity of the (meth)acrylic resin (A) and the crosslinking agent.

It is also possible to contain a monomer having a hydroxyl group (meth) acrylate and a monomer having the above other polar functional groups, but from the viewpoint of preventing peeling force of the separation film laminated on the outer surface of the adhesive layer 20, It is preferred that the monomer having an amine group is not substantially contained. 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 term "substantially not contained herein" means 0.1 part by weight or less based on 100 parts by weight of all the constituent units constituting the (meth)acrylic resin (A).

2) A acrylamide monomer.

For example, N-methylol acrylamide, N-(2-hydroxyethyl) acrylamide, N-(3-hydroxypropyl) acrylamide, N-(4-hydroxybutyl) propylene can be suitably used. Indoleamine, 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-imidazolyl)ethyl]propenylamine, 2-propenylamino-2-methyl-1-propanesulfonic acid, N-(methoxy Acrylamide, N-(ethoxymethyl)propenylamine, N-(propoxymethyl)propenylamine, N-(1-methylethoxymethyl)propenylamine, N -(1-A Propyloxymethyl)propenylamine, N-(2-methylpropoxymethyl)propenylamine [alias: N-(isobutoxymethyl)propenylamine], N-(butoxy Methyl) acrylamide, N-(1,1-dimethylethoxymethyl)propenylamine, N-(2-methoxyethyl)propenamide, N-(2-ethoxy Base ethyl) acrylamide, N-(2-propoxyethyl) acrylamide, N-[2-(1-methylethoxy)ethyl]propenylamine, N-[2-( 1-methylpropoxy)ethyl]propenylamine, N-[2-(2-methylpropoxy)ethyl]propenylamine [alias: N-(2-isobutoxyethyl) Acrylamide, N-(2-butoxyethyl) acrylamide, N-[2-(1,1-dimethylethoxy)ethyl]acrylamide, and the like. Among them, N-(methoxymethyl)propenylamine, N-(ethoxymethyl)propenylamine, N-(propoxymethyl)propenylamine, N-(butoxymethyl) Acrylamide, N-(2-methylpropoxymethyl)propenylamine.

3) Methacrylate, also known as methacrylic acid ester.

For example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, n-octyl methacrylate, lauryl methacrylate, etc. a branched alkyl ester of methacrylic acid such as isobutyl methacrylate, 2-ethylhexyl methacrylate or iso-octyl methacrylate; isobornyl methacrylate, methacrylic acid ring Hexyl ester, dicyclopentyl methacrylate, cyclododecan methacrylate, methylcyclohexyl methacrylate, trimethylcyclohexyl methacrylate, tri-butylcyclohexyl methacrylate, An alicyclic alkyl ester of methacrylic acid such as cyclohexyl phenyl methacrylate; an alkoxyalkyl ester of methacrylic acid such as 2-methoxyethyl methacrylate or ethoxymethyl methacrylate; Aralkyl methacrylate such as benzyl methacrylate; 2-hydroxyethyl methacrylate Ester, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 2-(2-hydroxyethoxy)ethyl methacrylate, 2-chloro-2-hydroxypropyl methacrylate, A An alkyl ester of methacrylic acid having a hydroxyl group such as 3-chloro-2-hydroxypropyl acrylate or diethylene glycol monomethacrylate; aminoethyl methacrylate, N, N-dimethyl methacrylate An alkyl ester of methacrylic acid having a substituted or unsubstituted amino group such as arylaminoethyl ester or dimethylaminopropyl methacrylate; 2-phenoxyethyl methacrylate or 2-(methacrylic acid) 2-phenoxyethoxy)ethyl ester, ethylene oxide modified nonylphenol ester of (meth)acrylic acid, 2-(o-phenylphenoxy)ethyl methacrylate, etc. Ethyl methacrylate ester and the like.

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 Alkyl styrene such as styrene, heptyl styrene or octyl styrene; halogenated styrene such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene or iodine styrene; nitrostyrene; Styrene; methoxystyrene; divinylbenzene and the like.

6) Vinyl monomer.

For example: vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, and other fatty acid vinyl esters; vinyl halides such as vinyl chloride and vinyl bromide; vinylidene chloride Chloride a vinylidene aromatic vinyl such as vinylpyridine, vinylpyrrolidone or vinylcarbazole; a conjugated diene monomer such as butadiene, isoprene or chloroprene; acrylonitrile, A An unsaturated nitrile such as acrylonitrile or 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 glycol Di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate is equivalent to 2 in the molecule (methyl 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 preferably derived from (meth) from the viewpoints of durability and metal corrosion resistance of the optical film 1 and the optical laminate having the adhesive layer. In addition to the constituent units of the alkyl acrylate, a constituent unit derived from a monomer having a polar functional group is also included. The monomer having a polar functional group is preferably a (meth) acrylate monomer having a polar functional group, and more preferably a monomer having a hydroxyl group. In 100 parts by weight of all the constituent units constituting the (meth)acrylic resin (A), the content of the constituent unit derived from the monomer having a polar functional group is preferably from 0.1 to 10 parts by weight, more preferably from 0.25 to 5 More preferably, it is 0.5 to 5 parts by weight based on 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 derived from methacrylate (ester of methacrylic acid) or methacrylic acid. Methacrylic acid such as amine monomer The content of the constituent unit of the base monomer is small, and specifically, the content of the constituent unit is preferably 10 parts by weight or less, and more preferably 100 parts by weight or less of all the constituent units constituting the (meth)acrylic resin (A). It is 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 weight average molecular weight on the discharge curve in the gel permeation chromatography (GPC) having a single peak in the range of Mw 1000 to 2.5 million, more preferably in the range of Mw 1000 to 250. There is a single peak in the range of 10,000, and contains constituent units derived from 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 is to be determined, the discharge curve is obtained according to the GPC measurement conditions described in the paragraph of 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 coefficient of 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. When the Mw is 500,000 or more, it is advantageous in improving the metal corrosion resistance and durability of the optical film 1 and the optical layered body with the adhesive layer, and also tends to improve the reworkability of the optical film 1 with the adhesive layer. Moreover, if the Mw is 2.5 million or less, the adhesive layer 20 is optical The followability of the dimensional change of the film 10 becomes good. The molecular weight distribution expressed by the ratio Mw/Mn of the weight average molecular weight Mw and the number average molecular weight Mn is usually 2 to 10. The Mw and Mn of the (meth)acrylic resin (A) were determined according to the GPC measurement conditions described in the paragraph of the examples.

When the (meth)acrylic resin (A) is dissolved in ethyl acetate to form a solution having a concentration of 20% by weight, the viscosity at 25 ° C is preferably 20 Pa ‧ or less, preferably 0.1 to 7 Pa. ‧s is better. Such a range of viscosity is advantageous for the durability of the optical film 1 and the optical laminate with the adhesive layer and the reworkability of the optical film 1 with the adhesive layer. The above viscosity is measured 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. Such a range of Tg is advantageous for the improvement of metal corrosion resistance and durability of the optical film 1 and the optical laminate with 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). From the viewpoint of the metal corrosion resistance and durability of the optical film 1 and the optical layered body with the adhesive layer, the (meth)acrylic resin is a total of all (meth)acrylic resins ( The content of A) is preferably 70% by weight or more, more preferably 80% by weight or more, still more preferably 90% by weight or more, and the particularly preferred adhesive composition contains only (meth)acrylic resin (A) as a matrix. The polymer is.

The (meth)acrylic resin (A) and other (meth)acrylic resins which may be used in combination may be, for example, a solution polymerization method, a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method, or the like. A well-known method is used for manufacturing. In the production of a (meth)acrylic resin, a polymerization initiator can be usually used. The polymerization initiator can be 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 of polymerizing an active energy ray such as ultraviolet light.

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, for example, 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis (cyclohexane) Alkan-1--1-carbonitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxy An azo compound of valeronitrile), dimethyl-2,2'-azobis(2-methylpropionate), 2,2'-azobis(2-hydroxymethylpropionitrile); Lauryl peroxide, tert-butyl hydroperoxide, benzammonium peroxide, tert-butyl peroxybenzoate, cumene hydroperoxide, diisopropyl peroxide Carbonate, dipropyl peroxydicarbonate, tri-butyl peroxy neodecanoate, tert-butylperoxytrimethyl acetate, (3,5,5-trimethylhexyl) An organic peroxide of a peroxide; such as potassium persulfate, ammonium persulfate, inorganic peroxide of hydrogen peroxide, and the like. Further, a redox initiator such as a peroxide and a reducing agent may be used in combination as a polymerization initiator.

A method for producing a (meth)acrylic resin, as described above Among the methods shown, a solution polymerization method is preferred. 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 or so. In order to regulate the reaction, a monomer and a thermal polymerization initiator may be added continuously or intermittently in the polymerization, or may be added in a state of being dissolved in an organic solvent. As the organic solvent, for example, aromatic hydrocarbons such as toluene and xylene; esters such as ethyl acetate and butyl acetate; aliphatic alcohols such as propyl alcohol and isopropyl alcohol; acetone and methyl ethyl ketone; A ketone such as methyl isobutyl ketone.

[2-2] decane compound (B)

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

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

According to the adhesive layer 20 containing the decane compound (B) represented by the above formula (I), the metal film of the adhesive layer and the metal-resistant body of the optical laminate can be improved as compared with the case of using other decane compounds. Corrosive and Durability, and further, adhesion of the adhesive layer 20 to the metal layer 30, the glass substrate, and the like can be improved. Two or more kinds of decane compounds (B) can also be used.

Specific examples of the alkanediyl group having 1 to 20 carbon atoms which may constitute A in the above formula (I) include a methylene group, a 1,2-ethanediyl group, a 1,3-propanediyl group, and 1, 4-butanediyl, 1,5-pentanediyl, 1,6-hexanediyl, 1,7-heptanediyl, 1,8-octanediyl, 1,9-decane 1,1,10-decanediyl, 1,12-dodecanediyl, 1,14-tetradecanediyl, 1,16-hexadecandiyl, 1,18-octadecanediyl 1,20-Eicosanedyl. Specific examples of the divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms include 1,3-cyclopentanediyl and 1,4-cyclohexanediyl. Specific examples of the group constituting the alkanediyl group and the -CH ₂ - substituted by -O- or -C(=O)- of the alicyclic hydrocarbon group include -CH ₂ CH ₂ -O-CH ₂ CH ₂ -, -CH ₂ CH ₂ -O-CH ₂ CH ₂ -O-CH ₂ CH ₂ -, -CH ₂ CH ₂ -O-CH ₂ CH ₂ -O-CH ₂ CH ₂ -O-CH ₂ CH ₂ -,- CH ₂ CH ₂ -C(=O)-O-CH ₂ CH ₂ -, -CH ₂ CH ₂ -O-CH ₂ CH ₂ -C(=O)-O-CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ -O-CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ -O-CH ₂ CH ₂ CH ₂ CH ₂ -.

The alkyl group having 1 to 5 carbon atoms of R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ in the above formula (I) may, for example, be methyl, ethyl, ortho- and iso- - propyl, n-, i-, and tri-butyl, n-, iso-, and tri-pentyl, etc.; pentyl groups; and R ² , R ³ , R ⁴ in the above formula (I) Examples of the alkoxy group having 1 to 5 carbon atoms of R ⁵ and R ⁶ include a methoxy group, an ethoxy group, a n-propoxy group, an iso-propoxy group, a n-butoxy group, and an iso-butyl group. Various pentyloxy groups such as an oxy group, a tri-butoxy group, a n-, an iso-, and a tri-pentyloxy group. The carbon number of the alkyl group and the alkoxy group are each independently, preferably 1 to 4, more preferably 1 to 3, still more preferably 1 or 2.

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

Bis(trimethoxyindenyl)methane, bis(triethoxyindenyl)methane, bis(tripropoxydecyl)methane, bis(tributyloxydecyl)methane, bis(tripentyloxyanthracene) Methane, bis(dimethoxymethylindolyl)methane, bis(dimethoxyethylhydrazinyl)methane, bis(dimethoxypropyl decyl)methane, bis(dimethoxyethyl) Methane, bis(dimethoxypropyl decyl)methane, bis(diethoxymethylindenyl)methane, bis(dipropoxymethylindenyl)methane, bis(methoxy Dimethylindenyl)methane, 1-(trimethyldecyl)-1-(methoxydimethylmethyl)methane, 1-(trimethyldecyl)-1-(dimethoxymethyl) Methane, 1-(trimethoxyindolyl)-1-(triethoxyindolyl)methane, bis(dimethoxyethoxyindolyl)methane, 1,2-bis(trimethoxy) Ethylene, 1,2-bis(triethoxyindenyl)ethane, 1,2-bis(tripropoxydecyl)ethane, 1,2-bis(tributoxyanthracene) Ethylene, 1,2-bis(tripentyloxyindenyl)ethane, 1,2-bis(dimethoxymethylindenyl)ethane, 1,2-bis(dimethoxyethylindenyl)ethane Alkane, 1,2-bis(dimethoxypropyl decyl)ethane, 1,2-bis(diethoxymethylindenyl)ethane, 1,2-bis(dipropoxymethyl) Mercapto) 1, 1,2-bis(methoxydimethylmethyl)ethane, 1-(trimethylsulfonyl)-2-(methoxydimethylmethyl)ethane, 1 -(Trimethyldecyl)-2-(dimethoxymethylindenyl)ethane, 1-(trimethoxyindolyl)-2-(triethoxyindenyl)ethane, 1,2 - bis(dimethoxyethoxyindenyl)ethane, 1,3-bis(trimethoxydecyl)propane, 1,3-bis(triethoxyindolyl)propane, 1,3-double (tripropoxydecyl)propane, 1,4-bis(trimethoxydecyl)butane, 1,4-bis(triethoxyindenyl)butane, 1,4-bis(tripropoxy) Butyl, butane, 1,4-bis(tributyloxydecyl)butane, 1,4-bis(tripentyloxyindenyl)butane, 1,4-bis(dimethoxymethyl) Butyryl, butane, 1,4-bis(dimethoxyethylindenyl)butane, 1,4-bis(dimethoxypropylindenyl)butane, 1,4-double (two Ethoxymethylindenyl)butane, 1,4-bis(dipropoxymethylindenyl)butane, 1,4-bis(methoxydimethylmercapto)butane, 1-(trimethylsulfonyl)-4-(methoxydimethylmercapto)butane, 1-(trimethylhydrazine) 4-(dimethoxymethylindenyl)butane, 1-(trimethoxyindolyl)-4-(triethoxyindenyl)butane, 1,4-bis(dimethoxy) Ethyloxyindenyl)butane, 1,5-bis(trimethoxydecyl)pentane, 1,5-bis(triethoxydecyl)pentane, 1,5-bis(tripropoxy) Pentyl)pentane, 1,6-bis(trimethoxydecyl)hexane, 1,6-bis(triethoxyindolyl)hexane, 1,6-bis(tripropoxydecyl) Hexane, 1,6-bis(tributyloxydecyl)hexane, 1,6-bis(tripentyloxyindenyl)hexane, 1,6-bis(dimethoxymethylindenyl) Hexane, 1,6-bis(dimethoxyethylindenyl)hexane, 1,6-bis(dimethoxypropylindenyl)hexane, 1,6-bis(dimethoxy) Ethyl decyl) hexane, 1,6-bis(dimethoxypropyl decyl) hexane, 1,6-bis(diethoxymethyl decyl) hexane, 1,6-bis ( Dipropoxymethylindenyl)hexane, 1,6-bis(methoxydimethylmethyl)hexane, 1-(trimethylsulfonyl)-6-(methoxydimethylguanidine) Hexyl, 1-(trimethylmethyl)-6-(dimethoxymethylindenyl)hexane, 1-(three Silicon based yloxy) -6- (silicon based triethoxysilyl) hexane, 1,6-bis(dimethoxyethoxyindenyl)hexane, 1,8-bis(trimethoxyindenyl)octane, 1,8-bis(triethoxyindenyl)octane, 1,8-bis(tripropoxyindenyl)octane, 1,8-bis(tributyloxydecyl)octane, 1,8-bis(tripentyloxyindenyl)octane, 1, 8-bis(dimethoxymethylindenyl)octane, 1,8-bis(dimethoxyethylindenyl)octane, 1,8-bis(dimethoxypropylindenyl)octyl Alkane, 1,8-bis(dimethoxyethylindenyl)octane, 1,8-bis(dimethoxypropylindenyl)octane, 1,8-bis(diethoxymethyl) Mercapto, octane, 1,8-bis(dipropoxymethylindenyl)octane, 1,8-bis(methoxydimethylindenyl)octane, 1-(trimethyldecyl) -8-(methoxydimethylmethyl)octane, 1-(trimethyldecyl)-8-(dimethoxymethylindenyl)octane, 1-(trimethoxyindenyl) )-8-(triethoxyindolyl)octane, 1,8-bis(dimethoxyethoxyindenyl)octane, 1,10-bis(trimethoxyindenyl)decane, 1 ,12-bis(trimethoxyindenyl)dodecane, 1,14-bis(trimethoxydecyl)tetradecane, 1,16-bis(trimethoxydecyl)hexadecane, 1,18 - bis(trimethoxydecyl)octadecane, 1,20-bis(trimethoxydecyl) Decane and the like.

Among them, the decane compound (B) is the following from the viewpoints of the metal corrosion resistance of the optical film 1 and the optical laminate with the adhesive layer, and the adhesion between the adhesive layer 20 and the metal layer 30 and the glass substrate. The decane compound represented by the formula (II) is preferably:

(wherein R ¹ , R ³ , R ⁴ , R ⁵ and R ⁶ each have the same meaning as defined above, R ⁷ represents an alkyl group having 1 to 5 carbon atoms, and m represents an integer of 1 to 20). Specific examples of the alkyl group having 1 to 5 carbon atoms which may constitute R ^{7 are} the same as described above. From the same viewpoint as above, the decane compound (B) is preferably a decane compound represented by the above formula (II) wherein m is an integer of 4 to 20, and the above formula (wherein m is an integer of 6 to 8) II) The decane compound shown is more preferably, particularly preferably 1,6-bis(trimethoxydecyl)hexane, 1,6-bis(triethoxyindolyl)hexane, 1,8- Bis(trimethoxyindenyl)octane, 1,8-bis(triethoxyindenyl)octane, etc., m is an integer from 6 to 8, OR ¹ , R ² , R ³ , R ⁴ , R ⁵ And R ⁶ and OR ⁷ are each independently a decane compound represented by the above formula (II) having 1 to 3 carbon atoms (for example, a carbon number of 1 or 2). A more suitable example of m is 6 or 8.

The adhesive composition may contain the decane compound (B) represented by the above formula (I) and one or more kinds of other decane compounds other than the decane compound (B). Other decane compounds include vinyl trimethoxy decane, vinyl triethoxy decane, vinyl ginseng (2-methoxyethoxy) decane, and 3-glycidoxypropyl trimethoxy. Decane, 3- Glycidoxypropyltriethoxydecane, 3-glycidoxypropylmethyldimethoxydecane, 3-glycidoxypropylethoxydimethyl decane, 2-( 3,4-Epoxycyclohexyl)ethyltrimethoxydecane, 3-chloropropylmethyldimethoxydecane, 3-chloropropyltrimethoxydecane, 3-methylpropenyloxypropyl Trimethoxydecane, 3-mercaptopropyltrimethoxydecane, and the like.

Other decane compounds may include polyoxyxene oligomers. When a specific example of the polyoxyxene oligomer is indicated by a combination of monomers, the following is as follows.

3-mercaptopropyltrimethoxydecane-tetramethoxydecane oligomer, 3-mercaptopropyltrimethoxydecane-tetraethoxydecane oligomer, 3-mercaptopropyltriethoxydecane-four a methoxypropyl alkane, a 3-mercaptopropyltriethoxydecane-tetraethoxydecane oligomer or the like having a mercaptopropyl group; a mercaptomethyltrimethoxydecane-tetramethoxydecane Oligomer, mercaptomethyltrimethoxydecane-tetraethoxydecane oligomer, mercaptomethyltriethoxydecane-tetramethoxydecane oligomer, mercaptomethyltriethoxydecane-tetraethyl a decylmethyl group-containing oligomer such as an oxoxane oligomer; a 3-glycidoxypropyltrimethoxydecane-tetramethoxydecane copolymer; 3-glycidoxypropyltrimethoxy矽-tetraethoxy decane copolymer, 3-glycidoxypropyltriethoxydecane-tetramethoxydecane copolymer, 3-glycidoxypropyltriethoxydecane-tetraethyl Oxydecane copolymer, 3-glycidoxypropylmethyldimethoxydecane-tetramethoxydecane copolymer, 3-glycidoxypropylmethyldimethoxydecane-tetraethyl Oxydecane Copolymer, 3-glycidoxypropylmethyldiethoxydecane-tetramethoxydecane copolymer, 3-glycidoxypropylmethyldiethoxydecane-tetraethoxydecane a copolymer containing a 3-glycidoxypropyl group such as a copolymer; 3-methacryloxypropyltrimethoxydecane-tetramethoxydecane oligomer, 3-methylpropenyloxypropane Trimethoxy decane-tetraethoxy decane oligomer, 3-methacryloxypropyltriethoxy decane-tetramethoxy decane oligomer, 3-methylpropenyloxypropyl Triethoxydecane-tetraethoxydecane oligomer, 3-methacryloxypropylmethyldimethoxydecane-tetramethoxydecane oligomer, 3-methylpropenyloxy Propylmethyldimethoxydecane-tetraethoxydecane oligomer, 3-methacryloxypropylmethyldiethoxydecane-tetramethoxydecane oligomer, 3-methyl An methacryloxypropyl methacrylate oligomer such as propylene methoxypropylmethyldiethoxy decane-tetraethoxy decane oligomer; 3-propenyloxypropyltrimethoxy decane- Tetramethoxydecane oligomer, 3-propenyloxypropane Trimethoxy decane-tetraethoxy decane oligomer, 3-propenyl methoxypropyl triethoxy decane-tetramethoxy decane oligomer, 3-propenyl methoxy propyl triethoxy矽-tetraethoxy decane oligomer, 3-propenyl methoxy propyl methyl dimethoxy decane-tetramethoxy decane oligomer, 3-propenyl methoxy propyl methyl dimethoxy矽-tetraethoxy decane oligomer, 3-propenyl methoxypropyl methyl diethoxy decane-tetramethoxy decane oligomer, 3-propenyl methoxy propyl methyl diethoxy An acryloxypropyl acrylate-containing oligomer such as a decane-tetraethoxydecane oligomer; a vinyltrimethoxydecane-tetramethoxydecane oligomer, a vinyltrimethoxydecane-tetraethoxy group Decane oligomer, vinyl triethoxy decane - Tetramethoxy decane oligomer, vinyl triethoxy decane-tetraethoxy decane oligomer, vinyl methyl dimethoxy decane-tetramethoxy decane oligomer, vinyl methyl acrylate Methoxy decane-tetraethoxy decane oligomer, vinyl methyl diethoxy decane-tetramethoxy decane oligomer, vinyl methyl diethoxy decane-tetraethoxy decane oligomerization a vinyl-containing oligomer; 3-aminopropyltrimethoxydecane-tetramethoxydecane copolymer, 3-aminopropyltrimethoxydecane-tetraethoxydecane copolymer, 3- Aminopropyltriethoxydecane-tetramethoxydecane copolymer, 3-aminopropyltriethoxydecane-tetraethoxydecane copolymer, 3-aminopropylmethyldimethoxy矽-tetramethoxydecane copolymer, 3-aminopropylmethyldimethoxydecane-tetraethoxydecane copolymer, 3-aminopropylmethyldiethoxydecane-tetramethoxy An amine group-containing copolymer such as a decane copolymer or a 3-aminopropylmethyldiethoxydecane-tetraethoxydecane copolymer.

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

In the adhesive composition, the content of the decane compound (B) is usually 0.01 to 10 parts by weight, preferably 0.03 to 5 parts by weight, more preferably 0.05 based on 100 parts by weight of the (meth)acrylic resin (A). It is more preferably from 0.1 to 1 part by weight to 2 parts by weight. When the content of the decane compound (B) is 0.01 parts by weight or more, the optical film 1 with an adhesive layer and the optical product are easily obtained. The effect of improving the metal corrosion resistance of the layer body and the effect of improving the adhesion between the adhesive layer 20 and the metal layer 30 and the glass substrate. 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.

[2-3] Ionic compound (C)

The adhesive composition contains an ionic compound (C). The antistatic property of the adhesive layer 20 can be imparted by containing the ionic compound (C). Conventionally, in the case where an adhesive layer 20 containing an ionic compound is laminated on the metal layer 30, the metal layer 30 may be corroded in a high-temperature and high-humidity environment, but according to the present invention, an attachment capable of suppressing the corrosion can be provided. The optical film 1 and the optical laminate of the adhesive layer. The ionic compound (C) is a compound composed of a cation and an anion. The cation may be any of an organic cation and an inorganic cation, and the anion may be either an organic anion or an inorganic anion. The adhesive composition may contain one or more ionic compounds (C).

Specific examples of the organic cation include: pyridinium cation, imidazolium cation, piperidinium cation, pyrrolidinium cation, tetrahydropyridine cation, dihydropyridine cation, tetrahydropyrimidinium cation, dihydropyrimidinium cation, pyrazole a phosphonium cation, a pyrazolinium cation, an ammonium cation, a phosphonium cation, a phosphonium cation, or the like. The organic cation may have a substituent. Specific examples of the inorganic cation include: an alkali metal ion such as a lithium cation [Li ⁺ ], a sodium cation [Na ⁺ ], a potassium cation [K ⁺ ], a ruthenium cation [Cs ⁺ ]; a ruthenium cation [Be ²⁺ ], a magnesium cation [Mg ²⁺ ], alkaline earth metal ions such as calcium cation [Ca2 ⁺ ], and the like.

Among them, from the compatibility with the (meth)acrylic resin (A) From the viewpoint of the nature, the cation is preferably an organic cation; from the viewpoint of antistatic properties, the cation is a pyridinium cation, an imidazolium cation, a piperidinium cation, a pyrrolidinium cation, a tetrahydropyridine cation, More preferably, an organic cation (which may have a substituent) containing a nitrogen atom such as a dihydropyridine cation, a tetrahydropyrimidinium cation, a dihydropyrimidinium cation, a pyrazolium cation, a pyrazolinium cation or an ammonium cation. A cation having a heterocyclic structure containing a nitrogen atom containing an unsaturated bond is more preferably further.

A specific example of a cation having a heterocyclic structure containing a nitrogen atom containing an unsaturated bond, and a pyridinium cation having a substituent: a pyridinium cation represented by the following formula (III):

In the above formula (III), R ⁸ to R ¹³ each independently represent a hydrogen atom, an alkyl group which may have a substituent, an alkenyl group which may have a substituent, an alkynyl group which may have a substituent, and an aromatic group which may have a substituent A heterocyclic group, a hydroxyl group, an ether group, a carboxyl group, a carbonyl group or a halogen atom which may have a substituent, or a substituent which may be adjacent to each other may form a ring.

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 12 Carbon, 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-cyanobenzylidenemethyl 4-methylbenzimidylmethyl, 2-methylbenzamide Methyl, 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 styryl group. The alkynyl group which may have a substituent is preferably an alkynyl group having 2 to 10 carbon atoms, and specific examples thereof include, for example, an ethynyl group, a propynyl group, and a propargyl group.

The aromatic group which may have a substituent is preferably a C 6 to 30 aryl group, 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, 2-indenyl, 9-fluorenyl, triphenyl, tetraphenyl, o-, m-, and p-toluene , dimethylphenyl, o-, m- and p-isopropylphenyl, 2,4,6-trimethyls (mesityl), cyclopentadienyl, binaphthyl, tris-naphthyl, hydrazine Naphthyl, cycloheptatrienyl, bisphenylene, dicyclopentadienylphenyl, fluoranthenyl, fluorenyl, vinyl fluorenyl, propylene naphthyl, anthracenyl, fluorenyl, hydrazino , hydrazine, hydrazinyl, fluorenyl, phenanthryl, triphenylene, fluorenyl, fused naphthyl, fused tetraphenyl, heptaenyl, fluorenyl, decyl, pentaphenyl , pentadecyl, phenylene, hexaphenyl, hexaphenyl, ruthenium, fluorenyl, hydrazinyl, isodecyl heptaphenyl, hexaphenyl, decyl, 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, piperanyl, isobenzofuranyl, benzopiperidyl, Base Thio group, 2H-pyrrolyl, pyrrolyl, imidazolyl, pyrazolyl, pyridyl, pyridyl Base, pyrimidinyl, oxime Base Base, isodecyl, 3H-fluorenyl, fluorenyl, 1H-carbazolyl, fluorenyl, 4H-quina Base, isoquinolyl, quinolyl, anthracene base, Pyridyl, quin Lolinyl, quinazolinyl, Lolinyl, acridinyl, 4aH-carbazolyl, oxazolyl, β-carbolinyl, phenanthryl, acridinyl, Perimidinyl, morpholinyl, brown Basal Base, isothiazolyl, thiophene Basis Azyl, furazolyl, brown Basis base, , pyrrolidinyl, pyrrolinyl, imidazolidinyl, imidazolinyl, pyrazolidinyl, pyrazolinyl, piperidinyl, piperidin Base, porphyrin group, isoindolyl group, Pyridyl, morpholinyl, thioxanthryl.

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 aromatic group which may have a substituent, and a substituent which may be substituted with a hydrogen atom of a heterocyclic group which may have a substituent Specific examples include, for example, 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 and a p-tolyl group; An alkoxycarbonyl group such as an oxy group such as an oxy group, a methoxycarbonyl group, a butoxycarbonyl group, a phenoxycarbonyl group, a vinyloxycarbonyl group or an aryloxycarbonyl group; an ethoxy group, a propyloxy group, and a benzoyl group; Anthracenyl group such as fluorenyloxy group; fluorenyl group, benzhydryl group, isobutyl fluorenyl group, acryl fluorenyl group, methacryl fluorenyl group, methoxycyanyl group, etc.; methylthio group, third-butyl group An alkylthio group such as a thio group; an arylthio group such as a phenylthio group or a p-tolylthio group; a methylamino group and a cyclohexyl group; An alkylamino group such as an amino group; a dialkylamino group such as a dimethylamino group, a diethylamino group, a morpholinyl group or a piperidinyl group; an arylamino group such as a phenylamino group or a p-tolylamino group; An alkyl group such as a methyl group, an ethyl group, a tributyl group or a dodecyl 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; Carboxyl, sulfonylamino, carbenyl, fluorenyl, sulfo, 2,4,6-trimethylphenyl, p-toluenesulfonyl, amine, nitro, nitroso, cyano, trifluoromethyl, Trichloromethyl, trimethylsulfonyl, phosphinyl, phosphinium, alkylsulfonyl, arylsulfonyl, trialkylammonium, dimethyl sulfoniumyl, Triphenyl benzamidine methyl fluorenyl.

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

Specific examples of the inorganic anion which can constitute the ionic compound (C) include a chloride anion [Cl ^- ], a bromine anion [Br ^- ], an iodine anion [I ^- ], an aluminosilicate anion [AlCl ₄ ^- ], Hexachloroaluminate anion [Al ₂ Cl ₇ ^- ], tetrafluoroborate anion [BF ₄ ^- ], hexafluorophosphate anion [PF ₆ ^- ], perchlorate anion [ClO ₄ ^- ], nitrate anion [ NO ₃ ^- ], hexafluoroarsenic acid anion [AsF ₆ ^- ], hexafluoroantimonate anion [SbF ₆ ^- ], hexafluoroantimonate anion [NbF ₆ ^- ], hexafluoroantimonate anion [TaF ₆ ^- ], bis(fluorosulfinyl) imine anion [(FSO ₂ ) ₂ N ^- ], fluorinated (poly) hydrofluoric acid anion [F(HF) _n ^- ] (n system 1 to 3 or so), etc. .

Specific examples of the organic anion which can constitute the ionic compound (C) include: acetate anion [CH ₃ COO ^- ], trifluoroacetate anion [CF ₃ COO ^- ], methanesulfonate anion [CH ₃ SO ₃ ^- ], trifluoromethanesulfonate anion [CF ₃ SO ₃ ^- ], p-toluenesulfonate anion [p-CH ₃ C ₆ H ₄ SO ₃ ^- ], bis(trifluoromethanesulfonyl) Amine anion [(CF ₃ SO ₂ ) ₂ N ^- ], ginseng (trifluoromethanesulfonyl) methyl anion [(CF ₃ SO ₂ ) ₃ C ^- ], dimethylphosphinate anion [(CH ₃ ) ₂ POO ^- ], thiocyanate anion [SCN ^- ], perfluorobutane sulfonate 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- ], tetraaryl a borate anion (for example, an anthracene (pentafluorophenyl) borate anion, etc.), a dicyanamide anion [(CN) ₂ N ^- ], and an imine anion represented by the following formula (IV) : Wait.

Among them, an anion containing a fluorine atom tends to have an ionic compound (C) which is excellent in antistatic property, and is preferred. In particular, the anion is a bis(trifluoromethanesulfonyl)imide anion, a bis(fluorosulfonyl)imide anion, an imine anion represented by the above formula (IV) or a quinone (pentafluorophenyl) borate. Anionic ionic compound (C), antistatic property, metal corrosion resistance and light resistance of optical film 1 and optical laminate with adhesive layer The improvement in learning durability is beneficial.

From the viewpoints of antistatic property, metal corrosion resistance, and optical durability, a suitable example of the ionic compound (C) is as follows.

1) The cation is a pyridinium cation represented by the following formula (III), and the anion is an anionic ionic compound selected from any one of the above groups:

(wherein R ⁸ is a linear, branched or cyclic alkyl group having 1 to 16 carbon atoms, and R ⁹ to R ¹³ are each independently a hydrogen atom or a carbon number of 1 to 20 Chain alkyl).

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

In the adhesive composition, the content of the ionic compound (C) per 100 parts by weight of the (meth)acrylic resin (A) is preferably from 0.1 to 10 parts by weight, more preferably from 0.2 to 8 parts by weight, still more. It is preferably 0.3 to 5 parts by weight, particularly preferably 0.5 to 3 parts by weight. When the content of the ionic compound (C) is 0.1 parts by weight or more, it is advantageous for the improvement of the antistatic property, and when it is 10 parts by weight or less, it is advantageous for the metal film corrosion of the optical film 1 and the optical laminate with the adhesive layer. Sex and durability.

[2-4] Isocyanate crosslinking agent (D)

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

The isocyanate crosslinking agent (D) is a compound having at least two isocyanato groups (-NCO) in the molecule, and specific examples thereof include methylphenyl diisocyanate, hexamethylene diisocyanate, and isophorone. Diisocyanate, benzoyl diisocyanate, hydrogenated xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, and the like. Further, the isocyanate crosslinking agent (D) may be a polyol compound adduct of an isocyanate compound (for example, an adduct of glycerin and trimethylolpropane), a trimeric isocyanate compound, or a biuret type compound. Further, it is derived from an isocyanate compound of a urethane prepolymer type which is subjected to an addition reaction with a polyether-based polyol and a polyester polyol, an acrylic polyol, a polybutadiene polyol, or a polyisoprene polyol. Things. Among the above, a polyol compound adduct of an isocyanate compound such as methyl phenyl diisocyanate, hexamethylene diisocyanate, benzoyl diisocyanate or the like, an optical film from an adhesive layer From the viewpoint of durability of the optical laminate, it is more preferable to use benzoyl diisocyanate or a polyol compound adduct thereof.

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

The adhesive composition may be used in combination with an isocyanate crosslinking agent (D) and a crosslinking agent other than the isocyanate crosslinking agent (D). For example, an epoxy compound, an aziridine compound, a metal chelate compound may be used in combination. Oxide, etc., from the viewpoint of metal corrosion resistance and durability of the optical film 1 and the optical laminate having the adhesive layer, the adhesive composition contains only the isocyanate crosslinking agent (D) as a crosslinking agent. In particular, it is preferred that the peroxide is substantially absent. 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).

[2-5] Other ingredients

The adhesive composition may contain one or more solvents, a crosslinking catalyst, an ultraviolet absorber, a weathering stabilizer, a tackifier, a plasticizer, a softener, a dye, a pigment, an inorganic filler, and light scattering. Additives such as microparticles. Further, an ultraviolet curable compound is blended in the adhesive composition to form an adhesive layer, which is cured by irradiation with ultraviolet rays, and is also used to form a harder adhesive layer. Examples of the cross-linking catalyst include hexamethylenediamine, ethylenediamine, polyvinylimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophoronediamine, and Sanya. An amine compound such as a methyl diamine, a polyamine resin or a melamine resin.

The adhesive composition may contain a rust preventive agent capable of improving the metal corrosion resistance of the optical film 1 and the optical laminate of the adhesive layer. Examples of the anti-caries agent include triazole compounds such as benzotriazole compounds and other triazole compounds; benzothiazole compounds and other thiazole compounds. Imidazole compound; benzyl imidazole compound, imidazole compound such as other imidazole compound; imidazoline compound; quinoline compound; pyridine compound; pyrimidine compound; lanthanide compound; amine compound; a compound; a sodium benzoate; a benzyl oxime compound; a di-second-butyl sulfide; and a diphenylarsenium.

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 preferably 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 part 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 layer containing one or more metals, and the metal of the metal layer is made of aluminum, copper, silver, gold, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead, and containing One or more selected from the group consisting of alloys of two or more kinds of metals; from the viewpoint of conductivity, it is preferable to include a metal selected from the group consisting of aluminum, copper, silver, and gold. The layer of the element; from the viewpoint of conductivity and cost, it is more preferable to include a layer of an aluminum element, and more preferably a layer containing an aluminum element as a main component. The inclusion of the main component means that the metal component constituting the metal layer 30 is 30% by weight or more of the total metal component, and further 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 excellent in corrosion resistance to metal monomers and 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 preferred. However, the optical laminate may have such a metal layer 30 and a transparent electrode layer containing a metal oxide such as ITO.

The form (for example, thickness) and the preparation method of the metal layer 30 are not particularly limited, and may be a metal foil, a vacuum deposition method, a sputtering method, an ion plating method, an inkjet printing method, or the like. The gravure printing method is preferably formed of 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 and the metal foil formed by sputtering have a tendency to have poor corrosion resistance, but according to the optical laminate of the present invention, even for the metal layer formed by sputtering, Has good resistance to metal corrosion. 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 of the metal wiring layer has 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. Even for the metal layer 30 composed of the metal layer 30 of such a film and the metal wiring of the thin wires, the optical laminate of the present invention 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, a thickness of 3 μm or less, and a line width of 10 μm or less, when it is formed by a sputtering method, corrosion can be suppressed, and in particular, pores can be suppressed. eclipse.

The metal layer 30 can be, for example, a touch input type liquid crystal display. The metal wiring layer (ie, the electrode layer) of the touch input element of the 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 also 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, for example, a metal layer 30 of 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 surface of the substrate 40 or may be formed on a portion of the substrate 40. When the patterned metal layer 30 is formed on the substrate 40 and a portion of the surface of the substrate 40 is formed to form the metal layer 30, one portion of the adhesive layer 20 is directly in contact with, for example, the substrate 40 formed of glass, and the optical laminate of the present invention. Since the adhesive layer 20 of 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 in such a case.

[4] Composition and manufacturing method of optical laminate

In the first embodiment, the optical layering system of the present invention, as shown in Figs. 4 and 5, comprises an optical film 1 with an adhesive layer and a layer deposited thereon. The metal layer 30 on the side of the agent layer 20. In the optical laminates 5 and 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 is directly connected to the metal layer 30. According to the present invention, even in the optical layered body in which the adhesive layer 20 is directly bonded to 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 another embodiment, the optical layered body 7 of the present invention is an optical layered body 7 shown in Fig. 6, and the adhesive layer 20 of the optical film 1 with an adhesive layer is laminated on the metal layer 30 via the resin layer 50. The adhesive layer 20 is directly bonded to 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. 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 layered body can be formed on the substrate 40 by, for example, bonding the optical film 1 including the optical film 10 and the adhesive layer of the adhesive layer 20 laminated on at least one surface thereof via the adhesive layer 20. It is made on the metal layer 30.

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 (Fig. 1). Can also The double-layer adhesive layer 20 of the optical film 10. 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, and to apply a surface activation treatment, for example, It is more preferable to apply a plasma treatment, a corona treatment, or the like to perform corona treatment.

When the optical film 10 is a single-sided protective polarizing plate shown in Fig. 2, it is usually on the surface of the polarizing plate, that is, on the surface opposite to the first resin film 3 of the polarizing plate 2, and it is preferable to directly laminate the adhesive layer. 20. When the optical film 10 is a double-sided protective polarizing plate shown in FIG. 3, the adhesive layer 20 may be applied to the outer layer of either of the first and second resin films 3 and 4, or may be adhered to the outer layer. Agent layer 20.

An antistatic layer may be additionally disposed between the optical film 10 and the adhesive layer 20, but since the adhesive layer 20 of the present invention imparts excellent antistatic property by using an adhesive layer alone, the film of the optical laminate is provided. It is preferable that the anti-static layer is not provided between the optical film 10 and the adhesive layer 20 in terms of simplification of the production steps of the laminate and the laminate.

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 be applied, for example, to a surface of the adhesive layer 20 comprising a film of various resins such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, or polyarylate. Handle the isolator.

The optical film 1 with an adhesive layer can be dissolved by dissolving or dispersing the components constituting the above-mentioned adhesive composition in a solvent. The adhesive composition of the agent is then applied to the surface of the optical film 10 and dried to form the adhesive layer 20. Further, the optical film 1 with the adhesive layer may be formed by laminating (transferring) the adhesive layer 20 to the optical film 10 by forming the adhesive layer 20 in the same manner as described above by the release-treated surface of the separation film. Made from the surface.

The optical layered body can be obtained by bonding the optical film 1 with the adhesive layer on the metal layer 30 (or the above-mentioned resin layer) via the adhesive layer 20. When the optical film 1 and the metal layer 30 with the adhesive layer are bonded to each other to form an optical layered body, if there is any problem, the optical film 1 with the adhesive layer is peeled off from the metal layer 30, and then the film is removed. The optical film 1 with the adhesive layer is reattached to the so-called heavy work of the metal layer 30. In the optical layered body of the present invention, the surface of the metal layer 30 from which the optical film 1 having the adhesive layer is peeled off from the metal layer 30 is less likely to cause fogging, residual glue, or the like, and is excellent in reworkability. According to the optical layered body of the present invention, when the surface of the pressure-sensitive adhesive layer 20 is not the metal layer 30 but the glass substrate or the ITO layer, good reworkability can be exhibited.

<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 touch panel can be configured as an out cell type or an on-cell inline type. Any of the conventionally known methods, such as an in-cell embedded type, and the operation of the touch panel may be any conventionally known method such as a resistive film type or a capacitance type (surface type electrostatic capacitance type or projected electrostatic capacitance type). the way. The optical layering system of the present invention can be disposed on the viewing side of the touch input element (liquid crystal cell), or 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 conventionally known method such as a TN method, a VA method, an IPS method, a multi-domain method, or 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.

(Example)

Hereinafter, the present invention will be specifically described by way of examples and comparative examples, but the invention is not limited thereto. Hereinafter, unless otherwise stated, the usage amount, the content portion, and the % are the weight basis.

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

A solution obtained by mixing a monomer having a composition shown in Table 1 (the numerical value in Table 1 is part by weight) with 81.8 parts of ethyl acetate was placed in a reaction vessel equipped with a cooling tube, a nitrogen gas introduction tube, a thermometer, and a stirrer. 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 part 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/hour to a concentration of the polymer of about 35%. The internal temperature was maintained at 54 to 56 ° C from the start of the addition of ethyl acetate until 12 hours passed. Ethyl acetate was added and the concentration of the polymer was adjusted to 20% to obtain an ethyl acetate solution of the (meth)acrylic resin (A-1). The weight average molecular weight Mw of the (meth)acrylic resin (A-1) was 1.39 million, and the ratio Mw/Mn of the weight average molecular weight Mw to the number average molecular weight Mn was 5.32. In the gel permeation chromatography (GPC) discharge curve, the composition of Mw 1.39 million represents a single peak, and no other peaks were confirmed 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 a (meth)acrylic resin (A-2) was obtained in the same manner as in Production Example 1 except that the composition of the monomers 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 showed a single peak, and in the range of Mw 1000 to 2.5 million, no other peak was confirmed.

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 a solution. 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. Determination. The conditions for obtaining the GPC discharge curve are also the same.

Glass transition temperature Tg is based on SII Nanotechnology The differential scanning calorimeter (DSC) "EXSTAR DSC6000" manufactured by Co., Ltd. was measured 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 (indicated as "GPC peak number" in Table 1) Consolidated in Table 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), HEA: 2-hydroxyethyl acrylate.

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

(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 decane compound (B) shown in Table 2 was obtained with respect to 100 parts of the solid content of the solution. Ionic compound (C) and different The cyanate-based crosslinking agent (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. The blending amount of each of the blending components shown in Table 2 is the weight fraction of the active ingredient contained in the merchandise when the product to be used contains a solvent or the like.

In Table 2, the details of each compounding component shown by the abbreviation are The content is as described later.

(decane compound)

B-1: a decane compound represented by the following formula: B-2: a decane compound represented by the following formula: B-3: 3-glycidoxypropyltrimethoxydecane, trade name "KBM403" obtained by Shin-Etsu Chemical Co., Ltd.

(ionic compound)

C-1: an ionic compound represented by the following formula: C-2: an ionic compound represented by the following formula: C-3: lithium bis(trifluoromethanesulfonyl)imide, C-4: potassium bis(fluorosulfonyl)imide, C-5:N-decylpyridinium bis(fluorosulfonyl) Amine, C-6: N-methylpyridinium (pentafluorophenyl) borate, C-7: N-decylpyridinium (pentafluorophenyl) borate.

(isocyanate crosslinking agent)

D-1: Ethyl acetate solution of trimethylolpropane adduct of benzoyl diisocyanate (solid content concentration: 75%), trade name "Takenate D-110N" obtained by Mitsui Chemicals Co., Ltd.

(2) Production of adhesive layer

By using an applicator, each of the adhesive compositions prepared in the above (1) is applied to the release-treated polyethylene terephthalate by applying an applicator so as to have a thickness of 20 μm after drying. The release film of the ester film [trade name "PLR-382051" obtained by Lintec Co., Ltd.] was 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 (Kuraray Vinylon VF-PE #6000, manufactured by Kuraray Co., Ltd.) having an average polymerization degree of about 2,400, a saponification degree of 99.9 mol%, and a thickness of 60 μm was immersed in pure water at 37 ° C. It was immersed in an aqueous solution containing iodine and potassium iodide (iodine/potassium iodide/water (weight ratio) = 0.04/1.5/100) at 30 °C. 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 direction of iodine adsorbed on the 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 containing a triethylenesulfonated cellulose film having a thickness of 25 μm was attached to one surface of the obtained polarizer via an adhesive containing an aqueous solution of a polyvinyl alcohol resin [trade name "Konica Minolta Opto Co., Ltd." KC2UA"]. Then, a zero phase difference of a cyclic polyolefin-based resin having a thickness of 23 μm was bonded to the surface of the polarizer opposite to the triacetyl cellulose film via an adhesive containing an aqueous solution of a polyvinyl alcohol resin. A film [trade name "ZEONOR" manufactured by Zeon Co., Ltd., Japan] was used to produce a polarizing plate. Then, after the corona discharge treatment for improving the adhesion is applied to the surface of the zero retardation film opposite to the surface of the polarizer, the laminate is bonded to the above (2). 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) Production of optical film (P-2) with adhesive layer

A polyvinyl alcohol film (Kuraray Vinylon VF-PE #3000, manufactured by Kuraray Co., Ltd.) 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, 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 is immersed in potassium iodine at 56.5 ° C And an aqueous solution of boric acid (potassium iodide / boric acid / water (weight ratio) = 12 / 3.6 / 100). The film was washed with pure water at 10 ° C, and then dried at 85 ° C to obtain a polarizer having a thickness of about 12 μm in the direction of iodine adsorbed on the 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 containing a triethylenesulfonated cellulose film having a thickness of 25 μm was attached to one surface of the obtained polarizer via an adhesive containing an aqueous solution of a polyvinyl alcohol resin [Konica Minolta Opto Co., Ltd. "KC2UA"] to make a polarizing plate. Then, on the opposite side of the surface of the polarizer to which the protective film is bonded, the separator on the opposite side to the separation film of the adhesive layer prepared in the above (2) is bonded by the laminator (adhesive layer). Thereafter, 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 attached to the metal layer side of the glass substrate with the metal layer via 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 laminated on the surface of the alkali-free glass by sputtering. The obtained optical laminate was stored in an oven at a temperature of 60 ° C and a relative humidity of 90% for 500 hours, and then the light was irradiated from the back surface of the glass substrate, and the optical film to which the adhesive layer was attached was observed from the surface of the polarizing plate through a magnifying glass. The state of the metal layer of the portion is evaluated on the basis of the following pitting corrosion (the generation of the hole capable of penetrating light having a diameter of 0.1 mm or more). The results are shown in Table 3.

5: no pitting and white turbidity are observed on the surface of the metal layer, 4: the number of pitting corrosion on the surface of the metal layer is 2 or less, 3: the number of pitting corrosion on the surface of the metal layer is 3 to 5 2: The number of pittings generated on the surface of the metal layer is 6 or more. 1: A large number of pittings are generated on the entire surface of the metal layer, and white turbidity is also generated.

(6) Durability evaluation of optical film with adhesive layer

The optical film (P-1) with the adhesive layer produced in the above (3) is cut into a size of 200 mm × 150 mm so that the direction of the axis of extension of the polarizing plate becomes a long side, and the separation film is peeled off. The adhesive layer is 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. The glass substrate was made of an alkali-free glass made by Corning Co., Ltd. under the trade name "Eagle XG". For the obtained optical laminate, the following three durability tests were carried out.

[Endurance test]

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

The optical laminate after each test was visually observed to visually observe the appearance change of the adhesive layer such as floating, peeling, foaming, etc., 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, and foaming is observed at all. 3: Appearance changes such as lifting, peeling, and foaming are hardly observed, and 2: appearance changes such as floating, peeling, and foaming are conspicuous. 1: Apparent changes such as lifting, peeling, and foaming were clearly confirmed.

(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, 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 in an environment of a temperature of 23 ° C and a relative humidity of 50%. The state of the surface of the glass substrate after peeling was observed and evaluated on the following basis. The results are shown in Table 3.

4: No atomization or the like was observed on the surface of the glass substrate, 3: no atomization was observed on the surface of the glass substrate, 2: atomization was confirmed on the surface of the glass substrate, and 1: on the surface of the glass substrate Confirm the residue of the adhesive layer.

(8) Evaluation of fading of optical film with adhesive layer

The optical film (P-2) with the adhesive layer prepared in the above (4) was cut into a size of 30 mm × 30 mm, and the separation film was peeled off, and the exposed adhesive layer was bonded to the glass substrate. For the glass substrate, the alkali-free glass product name "Eagle XG" manufactured by Corning Incorporated was used. For the obtained optical layered body, the MD transmittance and the TD transmittance in the range of 380 to 780 nm were measured using a spectrophotometer with an integrating sphere [product name "V 7100" manufactured by JASCO Corporation). Calculate the monomer transmittance and the degree of polarization of each wavelength, and further adopt the 2-dimensional field of view (C light source) by JIS Z 8701:1999 "Coloring method - XYZ color system and X ₁₀ Y ₁₀ Z ₁₀ color system" The photometric correction was performed to obtain the photometric correction monomer transmittance (Ty) and the photometric correction polarization (Py) before the endurance test. Further, in the optical layering system, the side of the triacetyl cellulose film of the polarizing plate was used as the detecting side, and the spectrophotometer with the integrating sphere was attached so that light was incident from the side of the glass substrate.

The monomer transmittance and the polarization degree are respectively defined by the following formula: monomer transmittance (λ) = 0.5 × (Tp (λ) + Tc (λ))

The degree of polarization (λ) = 100 × (Tp (λ) - Tc (λ)) / (Tp (λ) + Tc (λ)). Tp(λ) is the transmittance (%) of the optical laminate measured by the relationship between the linear polarization of the incident wavelength λ (nm) and the parallel polarizer, and Tc(λ) is the incident wavelength λ (nm). The transmittance (%) of the optical laminate measured by the relationship between the linear polarized light and the crossed nicol.

Then, the optical laminate was allowed to stand in a hot and humid environment at a temperature of 80 ° C and a relative humidity of 90% for 24 hours, and further at a temperature of 23 ° C. After standing for 24 hours in an environment having a relative humidity of 60%, Ty and Py after the endurance test were determined by the same method as before the endurance test. Thereafter, Py and Ty before the test were subtracted from the Py and Ty after the test, and the amount of change before and after the endurance test was calculated, and the amount of change in polarization (ΔPy) and the amount of change in monomer transmittance (ΔTy) were determined. . ΔPy is shown in the third table.

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

A solution obtained by mixing a monomer having a composition shown in Table 4 (the numerical value in Table 4 is part by weight) with 81.8 parts of ethyl acetate was placed in a reaction vessel equipped with a cooling tube, a nitrogen gas introduction tube, a thermometer, and a stirrer. 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/hour to a concentration of the polymer of about 35%. After the internal temperature was maintained at 54 to 56 ° C from the start of the addition of ethyl acetate, ethyl acetate was added and the concentration of the polymer was adjusted to 20% to obtain a (meth)acrylic resin. Ethyl acetate solution of (A-1). The weight average molecular weight Mw of the (meth)acrylic resin (A-1) was 1.39 million, and the ratio Mw/Mn of the weight average molecular weight Mw to the number average molecular weight Mn was 5.32. In the gel permeation chromatography (GPC) discharge curve, the composition of Mw 1.39 million showed a single peak, and other peaks were not confirmed 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 a 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, which was converted by standard polystyrene. To determine. The conditions for obtaining 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 temperature range of -80 to 50 ° C and a temperature increase rate of 10 ° C / min. Determination.

The composition of the monomer in Production Example 3 (the value in Table 4 is part by weight) and the number of peaks in the range of Mw 1000 to 2.5 million on the GPC discharge curve (labeled as "GPC peak number in Table 4") Consolidated in Table 4.

The abbreviation 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.

<Example 9 and Comparative Example 8>

(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 decane compound (B) shown in Table 5 was obtained with respect to 100 parts of the solid content of the solution. Ionic compound (C) and different The cyanate-based crosslinking agent (D) was mixed in an amount (parts by weight) shown in Table 5, and ethyl acetate was further 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 blending amount of each of the formulated components shown in Table 5 is the parts by weight of the active ingredient contained therein.

The details of each of the blending components indicated by the abbreviation in Table 5 are as follows.

(decane compound)

B-1: a decane compound represented by the following formula: B-3: 3-glycidoxypropyltrimethoxydecane, trade name "KBM403" obtained by Shin-Etsu Chemical Co., Ltd.

(ionic compound)

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

(isocyanate crosslinking agent)

D-1: Ethyl acetate solution of trimethylolpropane adduct of benzoyl diisocyanate (solid content concentration: 75%), trade name "Takenate D-110N" obtained by Mitsui Chemicals Co., Ltd.

(2) Production of adhesive layer

Each of the adhesive compositions prepared in the above (1) was applied to a separation membrane containing a polyethylene terephthalate film subjected to release treatment by using an applicator and drying to a thickness of 20 μm. The release treatment surface of the product name "PLR-382051" obtained by Lintec Co., Ltd. was 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 (Kuraray Vinylon VF-PE #6000, manufactured by Kuraray Co., Ltd.) having an average polymerization degree of about 2400, a saponification degree of 99.9 mol%, and a thickness of 60 μm 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 direction of iodine adsorbed on the 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.

The surface of the obtained polarizer is bonded to a thickness of 25 μm via an adhesive containing an aqueous solution of a polyvinyl alcohol-based resin. A transparent protective film of a cellulose film [trade name "KC2UA" manufactured by Konica Minolta Opto Co., Ltd.]. Then, a zero retardation film containing a cyclic polyolefin resin having a thickness of 23 μm was bonded to the surface of the polarizer opposite to the triacetyl cellulose film via an adhesive containing an aqueous solution of a polyvinyl alcohol resin. [The product name "ZEONOR" manufactured by Zeon Co., Ltd., Japan], and a polarizing plate was produced. Then, after the corona discharge treatment for improving the adhesion is applied to the surface of the zero retardation film that is in contact with the polarizer, the laminate is bonded to the above (2) by a laminator. After the separation film of the adhesive 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

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 via the adhesive layer. A glass substrate with a metal layer is a glass substrate on which a silver alloy (mainly composed of silver and containing an alloy of palladium and copper, APC) having a thickness of about 500 nm is laminated on the surface of the alkali-free glass by sputtering (Geomatec Co., Ltd.) system). The obtained optical laminate was stored in an oven at a temperature of 60 ° C and a relative humidity of 90% for 500 hours, and then irradiated with light from the back surface of the glass substrate, and the optical film to which the adhesive layer was attached was observed from the surface of the polarizing plate through a magnifying glass. The state of the partial metal layer was evaluated on the basis of the following pitting corrosion (the generation of the light-permeable hole having a diameter of 0.1 mm or more). The results are shown in Table 3.

5: no pitting and white turbidity are observed on the surface of the metal layer, 4: the number of pitting corrosion on the surface of the metal layer is 2 or less, 3: the number of pitting corrosion on the surface of the metal layer is 3 to 5 2: The number of pittings generated on the surface of the metal layer is 6 or more. 1: A large number of pittings are generated on the entire 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 (21)

An optical laminate comprising, in order, an optical film, an adhesive layer and a metal layer, wherein the adhesive layer comprises a (meth)acrylic resin (A), a decane compound (B), and an ionic compound (C) The decane compound (B) is a decane compound represented by the following formula (I): In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the -CH ₂ - system constituting the alkanediyl group and the alicyclic hydrocarbon group may also be - O- or -C(=O)-substituted, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent a carbon number of 1 to 5. An alkyl group or an alkoxy group having 1 to 5 carbon atoms. The optical layered body according to claim 1, wherein the metal layer comprises: aluminum, copper, silver, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead, and the like One or more selected from the group consisting of alloys of two or more kinds of metals. The optical laminate according to claim 1, wherein the metal layer comprises an aluminum element. The optical layered body according to claim 1, wherein the metal layer is a layer formed by sputtering. The optical layered body according to claim 1, wherein the metal layer has a thickness of 3 μm or less. The optical laminate according to claim 1, wherein the metal layer is a metal wiring layer. The optical layered body according to claim 6, wherein the metal wiring layer has a metal wiring having a line width of 10 μm or less. The optical layered product according to claim 1, wherein the decane compound (B) represented by the above formula (I) is a decane compound represented by the following formula (II): In the formula, R ¹ , R ³ , R ⁴ , R ⁵ and R ⁶ each have the same meaning as defined above, R ⁷ represents an alkyl group having 1 to 5 carbon atoms, and m represents an integer of 1 to 20. The optical laminate according to claim 8, wherein m in the above formula (II) is an integer of 4 to 20. The optical laminate according to claim 8, wherein m in the above formula (II) is an integer of 6 to 8. The optical laminate according to claim 8, wherein m in the above formula (II) is 6. The optical layered product according to claim 1, wherein the decane compound (B) is 1,6-bis(trimethoxyindenyl)hexane. An optical laminate according to claim 1, wherein the front In the adhesive composition, the content of the decane compound (B) is 0.01 to 10 parts by weight based on 100 parts by weight of the (meth)acrylic resin (A). The optical layered product according to the first aspect of the invention, wherein the (meth)acrylic resin (A) contains a constituent unit derived from a monomer having a hydroxyl group. The optical layered product according to claim 1, wherein the (meth)acrylic resin (A) contains an alkyl acrylate (a1) derived from a homopolymer having a glass transition temperature of less than 0 ° C. The constituent unit and the constituent unit derived from the alkyl acrylate (a2) having a glass transition temperature of 0 ° C or higher derived from the homopolymer. The optical layered product according to claim 1, wherein the (meth)acrylic resin (A) has a weight average molecular weight of from 500,000 to 2,500,000. The optical layered body according to claim 1, wherein the adhesive composition further contains an isocyanate crosslinking agent (D). The optical laminate according to claim 1, wherein the adhesive composition contains substantially no triazole compound. A liquid crystal display device comprising the optical layered body according to any one of claims 1 to 18. An adhesive composition comprising a (meth)acrylic resin (A), a decane compound (B), and an ionic compound (C), wherein the decane compound (B) is a decane represented by the following formula (I) Compound: In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the -CH ₂ - system constituting the alkanediyl group and the alicyclic hydrocarbon group may be -O - or -C(=O)-substituted, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 5 carbon atoms. a group or an alkoxy group having 1 to 5 carbon atoms; can be used for the formation of an adhesive layer laminated on a metal layer. 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 via the adhesive layer The optical film; the adhesive layer is formed of an adhesive composition, and the adhesive composition comprises a (meth)acrylic resin (A), a decane compound (B), and an ionic compound (C); and the aforementioned decane The compound (B) is a decane compound represented by the following formula (I): In the formula, A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the -CH ₂ - system constituting the alkanediyl group and the alicyclic hydrocarbon group may be -O - or -C(=O)-substituted, R ¹ represents an alkyl group having 1 to 5 carbon atoms, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 5 carbon atoms. Alkoxy groups having 1 to 5 carbon atoms.