KR20160117296A - Optical film with adhesive layer and liquid crystal display device - Google Patents

Abstract

Provided is an adhesive layer-attached optical film which includes an optical film and an adhesive layer laminated on at least one side thereof. The adhesive layer is made of an adhesive composition which includes a (meth)acrylate-based resin (A), a silane compound (B), and an ionic compound (C), wherein the silane compound (B) is represented by chemical formula (I), and anion on the ionic compound (C) is selected from a certain group. Also, provided is a liquid crystal display device including the same.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical film with a pressure-sensitive adhesive layer and a liquid crystal display device,

The present invention relates to an optical film with a pressure-sensitive adhesive layer and a liquid crystal display device including the same.

An optical film typified by a polarizing plate in which a transparent resin film is laminated on one surface or both surfaces of a polarizer is widely used as an optical member constituting an image display device such as a liquid crystal display device. An optical film such as a polarizing plate is often used by being bonded to another member (for example, a liquid crystal cell or the like in a liquid crystal display device) through a pressure-sensitive adhesive layer (see, for example, Japanese Patent Application Laid-Open No. 2010-229321). As the optical film, there is known an optical film with a pressure-sensitive adhesive layer in which a pressure-sensitive adhesive layer is previously formed on one side thereof. It is also known to contain an ionic compound in the pressure-sensitive adhesive layer so as to impart antistatic properties.

2. Description of the Related Art In recent years, liquid crystal display devices have been developed for use in mobile devices having a touch panel function represented by a smart phone, a tablet type terminal, and a vehicle-mounted car navigation system. In such touch-input liquid crystal display devices, the optical film with a pressure-sensitive adhesive layer may be arranged such that the pressure-sensitive adhesive layer is in direct contact with, for example, a resin layer or a metal layer composed of metal wiring. However, in a configuration in which a metal layer made of a metal material and a pressure-sensitive adhesive layer containing an ionic compound are combined, the metal layer may be corroded under a high temperature and high humidity environment. Among the corrosion, the formula (pitting corrosion) is a problem particularly when the thickness of the metal layer is thin or when the line width is narrow when the metal layer is a metal line, because the metal layer penetrates.

An object of the present invention is to provide an optical film with a pressure-sensitive adhesive layer capable of suppressing corrosion of a metal layer such as a metal wiring layer and a liquid crystal display device including the same.

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

[1] An optical film comprising an optical film and a pressure-sensitive adhesive layer laminated on at least one side thereof,

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

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

(Wherein A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the alkanediyl group and -CH ₂ - constituting the alicyclic hydrocarbon group are -O- or - R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a substituted or unsubstituted alkyl group having 1 to ⁵ carbon atoms An alkoxy group having 1 to 5 carbon atoms.

Is a silane compound represented by the formula

The anion of the ionic compound (C)

Wherein the anion is an anion selected from the group consisting of:

[2] The positive resist composition according to [1], wherein the silane compound (B) represented by the formula (I)

(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)

Is a silane compound represented by the following general formula (1): " (1) "

[3] The optical film with a pressure-sensitive adhesive layer according to [2], wherein m in the formula (II) is an integer of 4 to 20.

[4] The optical film with a pressure-sensitive adhesive layer according to [2], wherein m in the formula (II) is an integer of 6 to 8.

[5] The optical film with a pressure-sensitive adhesive layer according to [2], wherein m in the formula (II) is 6.

[6] The optical film with a pressure-sensitive adhesive layer according to any one of [1] to [5], wherein the silane compound (B) is 1,6-bis (trimethoxysilyl) hexane.

[7] The optical film with a pressure-sensitive adhesive layer according to any one of [1] to [6], wherein the cation of the ionic compound (C) is a cation having a nitrogen atom-containing heterocyclic structure containing an unsaturated bond.

[8] The cation of the ionic compound (C) is represented by the following formula (III):

(Wherein 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, an aryl group which may have a substituent, A hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring).

Is a pyridinium cation represented by the following general formula (1): " (1) "

[9] The pressure-sensitive adhesive composition according to any one of [1] to [8], wherein the content of the silane compound (B) is 0.01 to 10 parts by weight based on 100 parts by weight of the (meth) acrylic resin (A) An optical film with a pressure-sensitive adhesive layer.

[10] The optical film with a pressure-sensitive adhesive layer according to any one of [1] to [9], wherein the (meth) acrylic resin (A) contains a structural unit derived from a monomer having a hydroxyl group.

The above-mentioned (meth) acrylic resin (A) is a copolymer of a structural unit derived from an alkyl acrylate (a1) having a glass transition temperature of the homopolymer of less than 0 ° C and an alkyl acrylate having a glass transition temperature of 0 ° C or higher Sensitive adhesive layer according to any one of [1] to [10].

[12] The optical film with a pressure-sensitive adhesive layer according to any one of [1] to [11], wherein the (meth) acrylic resin (A) has a weight average molecular weight of 500,000 to 250,000.

[13] The optical film with a pressure-sensitive adhesive layer according to any one of [1] to [12], wherein the pressure-sensitive adhesive composition further comprises an isocyanate-based crosslinking agent (D).

[14] The optical film with a pressure-sensitive adhesive layer according to any one of [1] to [13], wherein the pressure-sensitive adhesive composition does not substantially contain a triazole-based compound.

[15] A liquid crystal display device comprising the optical film with a pressure-sensitive adhesive layer according to any one of [1] to [14].

(16) A resin composition comprising a (meth) acrylic resin (A), a silane compound (B) and an ionic compound (C)

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

(Wherein A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the alkanediyl group and -CH ₂ - constituting the alicyclic hydrocarbon group are -O- or - R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a substituted or unsubstituted alkyl group having 1 to ⁵ carbon atoms An alkoxy group having 1 to 5 carbon atoms.

Is a silane compound represented by the formula

The anion of the ionic compound (C)

, ≪ / RTI >

A pressure-sensitive adhesive composition used for forming a pressure-sensitive adhesive layer to be laminated on a metal layer.

According to the present invention, it is possible to provide an optical film with a pressure-sensitive adhesive layer capable of suppressing corrosion of a metal layer and a liquid crystal display device including the optical film.

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

<Optical film with pressure-sensitive adhesive layer>

1 is a schematic cross-sectional view showing an example of an optical film with a pressure-sensitive adhesive layer according to the present invention. As shown in Fig. 1, the optical film (1) with a pressure-sensitive adhesive layer according to the present invention comprises an optical film (10) and a pressure-sensitive adhesive layer (20) laminated on at least one side thereof. The pressure-sensitive adhesive layer 20 is usually directly laminated on the surface of the optical film 10.

The optical film 10 may be an optical film having a single-layer structure or an optical film having a multilayer structure. The pressure-sensitive adhesive layer 20 is composed of a pressure-sensitive adhesive composition comprising a (meth) acrylic resin (A), a silane compound (B) and an ionic compound (C), preferably further comprising an isocyanate crosslinking agent . The pressure-sensitive adhesive composition may contain another component. In the present specification, "(meth) acrylic" means at least one selected from the group consisting of acrylic and methacrylic. The same applies to "(meth) acrylate" and "(meth) acryloyl".

[1] optical films

The optical film 10 provided in the optical film (1) with a pressure-sensitive adhesive layer may be various optical films (films having optical properties) that can be embedded in an image display apparatus such as a liquid crystal display device. The optical film 10 may be an optical film having a single-layer structure or an optical film having a multilayer structure. Specific examples of the single-layered optical film include an optical functional film such as a retardation film, a brightness enhancement film, an antiglare film, an antireflection film, a diffusion film, and a light condensing film in addition to a polarizer. Specific examples of the optical film having a multilayer structure include a polarizing plate and a retarder. In this specification, a polarizer refers to a laminate of a resin film or a resin layer on at least one surface of a polarizer. The term retardation plate refers to a laminate of a resin film or a resin layer on at least one surface of a retardation film. The optical film 10 is preferably a polarizing plate, a polarizer, a retardation film or a retardation film, and more preferably a polarizing plate or a polarizer.

[1-1] Polarizer

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

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

The polyvinyl alcohol-based resin can be obtained by saponifying a polyvinyl acetate-based resin. Examples of the polyvinyl acetate resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and vinyl acetate copolymerizable with vinyl acetate. Examples of the monomer copolymerizable with vinyl acetate include (meth) acrylamides having an unsaturated carboxylic acid, an olefin, a vinyl ether, an unsaturated sulfonic acid, and an ammonium group.

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

Usually, a film obtained by forming a polyvinyl alcohol-based resin is used as a raw film of the polarizer 2. The polyvinyl alcohol resin can be formed by a known method. The thickness of the original film is usually 1 to 150 占 퐉, preferably 10 占 퐉 or more, considering the ease of stretching.

The polarizer 2 can be obtained by, for example, a process of uniaxially stretching the original film, a step of dyeing the film with a dichroic dye, a step of adsorbing the dichroic dye, a step of treating the film with an aqueous solution of boric acid, And finally dried. The thickness of the polarizer 2 is usually 1 to 30 占 퐉 and preferably 20 占 퐉 or less, more preferably 15 占 퐉 or less, further preferably 10 占 퐉 or less from the viewpoint of thinning of the optical film (1) to be.

A polarizer (2) obtained by adsorbing dichroic dye to a polyvinyl alcohol-based resin film by adsorption orientation can be obtained by (1) using a single film of a polyvinyl alcohol-based resin film as the original film and subjecting the film to monoaxial stretching treatment and dichroism (2) a coating solution (aqueous solution or the like) containing a polyvinyl alcohol-based resin is coated and dried on the base film to obtain a base film having a polyvinyl alcohol-based resin layer, The uniaxially stretched whole, the stretched polyvinyl alcohol-based resin layer is dyed with a dichroic dye, and then the base film is peeled off. As the base film, a film made of the same thermoplastic resin as the thermoplastic resin that can form the first and second resin films (3, 4) to be described later can be used, and a polyester film such as polyethylene terephthalate A resin such as a polycarbonate resin, a cellulose resin such as triacetylcellulose, a cyclic polyolefin resin such as a norbornene resin, and a polystyrene resin. According to the method 2), the manufacture of the polarizer 2 of a thin film becomes easy, and the polarizer 2 having a thickness of 7 탆 or less, for example, can be easily produced.

The first and second resin films 3 and 4 are each independently formed of a transparent thermoplastic resin, preferably a optically transparent thermoplastic resin such as a chain polyolefin resin (polyethylene resin, polypropylene resin, etc.), a cyclic polyolefin Polyolefin-based resins such as based resins (norbornene-based resins and the like); Cellulose-based resins (such as cellulose ester-based resins); Polyester resins (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate and the like); Polycarbonate resin; (Meth) acrylic resins; Polystyrene type resin; Polyether ether ketone resin; A polysulfone resin, a mixture thereof, a copolymer, and the like. Among them, the first and second resin films (3, 4) are preferably made of a resin selected from the group consisting of a cyclic polyolefin resin, a polycarbonate resin, a cellulose resin, a polyester resin and a (meth) acrylic resin And more preferably a resin selected from the group consisting of a cellulose-based resin and a cyclic polyolefin-based resin.

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

The cyclic polyolefin-based resin is a generic name of a resin containing, as a polymerization unit, a cyclic olefin represented by norbornene or tetracyclododecene (alias: dimethano-octahydronaphthalene) or a derivative thereof. Specific examples of the cyclic polyolefin-based resin include ring-opened (co) polymers of cyclic olefins and hydrogenated products thereof, addition polymers of cyclic olefins, copolymers of cyclic olefins and chain olefins such as ethylene and propylene, or aromatic compounds having vinyl groups, And modified (co) polymers obtained by modifying these with an unsaturated carboxylic acid or a derivative thereof. Among them, norbornene-based resins using norbornene monomers such as norbornene and polycyclic norbornene monomers as cyclic olefins are preferably used.

The cellulose-based resin is preferably a cellulose ester-based resin, that is, a partial or complete esterified product of cellulose, and examples thereof include acetic acid ester, propionic acid ester, butyric acid ester and mixed ester thereof of cellulose. Among them, triacetylcellulose, diacetylcellulose, cellulose acetate propionate, cellulose acetate butyrate and the like are preferably used.

The polyester-based resin is a resin other than the cellulose ester-based resin having an ester bond, and is generally composed of a polycondensation product of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol. Specific examples of the polyester-based resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethyl terephthalate, polycyclohexane Dimethyl naphthalate.

The polycarbonate resin is a polyester formed from carbonic acid and glycol or bisphenol. Among them, an aromatic polycarbonate having a diphenylalkane in its molecular chain is preferably used from the viewpoints of heat resistance, weather resistance and acid resistance. As the polycarbonate, there may be mentioned 2,2-bis (4-hydroxyphenyl) propane (alicyclic bisphenol A), 2,2-bis (4-hydroxyphenyl) butane, And polycarbonates derived from bisphenols such as hexane, 1,1-bis (4-hydroxyphenyl) isobutane, and 1,1-bis (4-hydroxyphenyl) ethane.

The (meth) acrylic resin capable of constituting the first and second resin films (3, 4) may be a polymer mainly comprising a constituent unit derived from methacrylic acid ester (for example, containing 50 wt% or more thereof) , And a copolymer in which other copolymerizable components are copolymerized. The (meth) acrylic resin may contain two or more constituent units derived from methacrylic acid ester. Examples of the methacrylic ester include C ₁ -C ₄ alkyl esters of methacrylic acid such as methyl methacrylate, ethyl methacrylate and butyl methacrylate.

Examples of the copolymerizable component copolymerizable with the methacrylic acid ester include acrylic acid esters. The acrylate ester is preferably a C ₁ -C ₈ alkyl ester of acrylic acid such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate and the like. Specific examples of other copolymerization components include unsaturated acids such as (meth) acrylic acid; Aromatic vinyl compounds such as styrene, halogenated styrene,? -Methylstyrene and vinyltoluene; (Meth) acrylonitrile; Unsaturated acid anhydrides such as maleic anhydride and citraconic anhydride; And unsaturated imides such as phenylmaleimide and cyclohexylmaleimide, and compounds other than the acrylic ester having one polymerizable carbon-carbon double bond in the molecule. A compound having two or more polymerizable carbon-carbon double bonds in the molecule may be used as a 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 main chain of the polymer in view of increasing the durability of the film. The ring structure is preferably a heterocyclic structure such as cyclic acid anhydride structure, cyclic imide structure, and lactone ring structure. Concrete examples of the cyclic acid anhydride structure include an anhydroglutaric acid structure and an anhydrous succinic acid structure. Specific examples of the cyclic imide structure include a glutarimide structure and a succinimide structure. Specific examples of the lactone ring structure include , Butyrolactone ring structure, and valerolactone ring structure, respectively.

The (meth) acrylic resin may contain acrylic rubber particles from the viewpoints of film formability to film and impact resistance of film. The acrylic rubber particles are particles of an elastomer mainly composed of an acrylate ester as an essential component and substantially of a single-layer structure composed of only the elastomer, or a multi-layer structure of an elastomer as a single layer. As an example of the elastomer, a crosslinked elastic copolymer comprising an alkyl acrylate as a main component and another copolymerizable vinyl monomer and a crosslinkable monomer copolymerized therewith may be cited. Examples of the alkyl acrylate as a main component of the elastomer include C ₁ -C ₈ alkyl esters of acrylic acid such as methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. The number of carbon atoms in the alkyl group is preferably 4 or more.

Examples of other vinyl monomers copolymerizable with alkyl acrylate include compounds having one polymerizable carbon-carbon double bond in the molecule, and more specifically, methacrylic acid esters such as methyl methacrylate, aromatic Vinyl compounds, vinyl cyan compounds such as (meth) acrylonitrile, and the like. Examples of the crosslinkable monomer include crosslinkable compounds having at least two polymerizable carbon-carbon double bonds in the molecule, and more specifically, ethylene glycol di (meth) acrylate, butanediol di (meth) acrylate and the like (Meth) acrylate of polyhydric alcohol, alkenyl esters of (meth) acrylic acid such as allyl (meth) acrylate, and divinylbenzene.

The content of the acrylic rubber particles is preferably 5 parts by weight or more, and 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 surface treatment is performed on the film, the solvent resistance to the organic solvent in the surface treatment agent may be lowered. Therefore, the content of the acrylic rubber particles is generally 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 conventional additives in the technical field of the present invention. Specific examples of the additives include ultraviolet absorbers, infrared absorbers, organic dyes, pigments, inorganic pigments, antioxidants, antistatic agents, surfactants, lubricants, dispersants, heat stabilizers and the like.

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

Each of the first and second resin films 3 and 4 may be either a stretched film or a uniaxially or biaxially stretched film. The biaxial stretching may be simultaneous biaxial stretching in which two stretching directions are simultaneously performed in two stretching directions, or sequential biaxial stretching in which stretching is performed in a predetermined direction and then stretching in the other direction. The first resin film 3 and / or the second resin film 4 may be a protective film that protects the polarizer 2 or may be a protective film having an optical function such as a retardation film have. The retardation film is an optical film exhibiting optical anisotropy. For example, a retardation film having an arbitrary retardation value can be obtained by stretching a film made of the thermoplastic resin (uniaxial stretching or biaxial stretching) or forming a liquid crystal layer or the like on the thermoplastic resin film.

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

The first resin film 3 and / or the second resin film 4 may have a hard coat layer, an antiglare layer, an antireflection layer, a light diffusion layer, an antistatic layer, a retardation layer , And a surface treatment layer (coating layer) such as a conductive layer.

The thicknesses of the first resin film 3 and the second resin film 4 are each usually 1 to 150 占 퐉, preferably 5 to 100 占 퐉, and more preferably 5 to 60 占 퐉. The thickness may be 50 占 퐉 or less, or 30 占 퐉 or less. The reduction of the thickness of the first and second resin films 3 and 4 can be attained by reducing the thickness of the optical film 1 with a pressure-sensitive adhesive layer and the optical laminate including the optical film 1, It is advantageous to make the liquid crystal display device including the sieve thinner.

Particularly, in the case of small-sized polarizing plates for use in smart phones and tablet-type terminals, a thin film having a thickness of 30 탆 or less is often used as the first resin film 3 and / or the second resin film 4, , The polarizing plate has a weak force for suppressing the contracting force of the polarizer 2, so that the durability tends to become insufficient. According to the present invention, it is possible to provide an optical film (1) having a pressure-sensitive adhesive layer having good durability even when such a polarizing plate is used as the optical film (10) and an optical laminate including the same. The durability of the optical film (1) and the optical laminate with a pressure-sensitive adhesive layer means that the pressure-sensitive adhesive layer (20) and the optical member adjacent to the pressure-sensitive adhesive layer (20) are in contact with each other in a high temperature and high humidity environment, And peeling of the pressure-sensitive adhesive layer 20 at the interface of the pressure-sensitive adhesive layer 20 and foaming of the pressure-sensitive adhesive layer 20 can be suppressed.

From the viewpoint of thinning of the polarizing plate, it is advantageous that the resin film is disposed only on one side of the polarizer 2 like the polarizing plate 10a shown in Fig. In this case, the pressure-sensitive adhesive layer 20 is normally bonded directly to the other surface of the polarizer 2 to form an optical film 1 with a pressure-sensitive adhesive layer (see Fig. 4). In the case of the polarizing plate having such a constitution, the problem that the optical performance of the polarizing plate is lowered under the high temperature and high humidity environment by the ionic compound contained in the pressure-sensitive adhesive layer 20 becomes remarkable. According to the present invention, there is provided a pressure-sensitive adhesive layer-attached optical film (1) having good optical durability (property capable of suppressing deterioration of optical characteristics) even when such a polarizing plate is used as the optical film (10) and an optical laminate .

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

Examples of the water-based adhesive include an adhesive composed of a polyvinyl alcohol-based resin aqueous solution, an aqueous two-component type urethane emulsion adhesive, and the like. Among them, an aqueous adhesive composed of a polyvinyl alcohol-based resin aqueous solution is suitably used. Examples of the polyvinyl alcohol-based resin include a polyvinyl alcohol-based copolymer obtained by saponifying a copolymer of vinyl acetate and other monomers copolymerizable therewith, in addition to a vinyl alcohol homopolymer obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate. Or a modified polyvinyl alcohol polymer obtained by partially modifying a hydroxyl group thereof, and the like can be used. The water-based adhesive may include 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 a step of bonding the polarizer 2 and the first and second resin films 3 and 4, followed by drying to remove water contained in the aqueous adhesive. After the drying step, a curing step for curing at a temperature of, for example, about 20 to 45 DEG C may be provided.

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

In the case of using an active energy ray-curable adhesive, the polarizer 2 and the first and second resin films 3 and 4 are bonded to each other, and if necessary, a drying step is performed. Subsequently, A curing step for curing the pre-curable adhesive is performed. Although a light source of an active energy ray is not particularly limited, ultraviolet rays having a light emission distribution at a wavelength of 400 nm or less are preferable. Specifically, low energy mercury lamps, medium pressure mercury lamps, high pressure mercury lamps, ultra high pressure mercury lamps, chemical lamps, A mercury lamp, a metal halide lamp, or the like can be used.

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

The polarizing plates 10a and 10b may further include other films or layers. Specific examples thereof include a brightness enhancement film, an antiglare film, an antireflection film, a diffusion film, a light-condensing film, a pressure-sensitive adhesive layer other than the pressure-sensitive adhesive layer 20, a coating layer, and a protective film 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 or contamination. The optical film 1 with a pressure-sensitive adhesive layer is bonded onto the metal layer 30, .

The protective film is usually composed of a base film and a pressure-sensitive adhesive layer laminated thereon. The base film may be formed of a thermoplastic resin, for example, a polyolefin-based resin such as a polyethylene-based resin or a polypropylene-based resin; Polyester based resins such as polyethylene terephthalate and polyethylene naphthalate; Polycarbonate resin; (Meth) acrylic resin or the like.

[1-2]

As described above, the retardation film included in the retardation plate is an optical film exhibiting optical anisotropy and can be used for the first and second resin films 3 and 4. In addition to the thermoplastic resin exemplified above, for example, polyvinyl Polyolefin resin, polyether sulfone resin, polyvinylidene fluoride / polymethyl methacrylate resin, liquid crystal polyester resin, ethylene-vinyl acetate copolymer saponite, poly And a resin film made of a polyvinyl chloride resin or the like is stretched to about 1.01 to 6 times. Among them, a polycarbonate resin film, a cycloolefin resin film, a (meth) acrylic resin film or a cellulose resin film is preferably a uniaxially or biaxially stretched film. In the present specification, a zero retardation film is also included in the retardation film (but may also be used as a protective film). In addition, a film called a uniaxial retardation film, a wide viewing angle retardation film, or a low light elasticity retardation film is also applicable as a retardation film.

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

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

R _e = (n _x -n _y ) x d

_{R th = [(n x +} n y) / 2-n z] × d

Wherein, n _x is a refractive index in a slow axis direction (x axis direction) in the film plane, n _y is a refractive index of the (y-axis direction orthogonal to the x axis within the plane), the fast axis direction in the film plane, n _z is Is the refractive index in the film thickness direction (z-axis direction perpendicular to the film surface), and d is the thickness of the film.

As the zero retardation film, for example, a resin film made of a polyolefin resin such as a cellulose resin, a chain polyolefin resin and a cyclic polyolefin resin, a polyethylene terephthalate resin or a (meth) acrylic resin can be used. Particularly, a cellulose resin, a polyolefin resin or a (meth) acrylic resin is preferably used since the control of the retardation value is easy and easy to obtain.

A film exhibiting optical anisotropy by application and orientation of a liquid crystal compound or a film exhibiting optical anisotropy by application of an inorganic layer compound can also be used as a retardation film. Such a retardation film may be referred to as a temperature compensating retardation film or a film in which a rod-shaped liquid crystal sold under the trade name of &quot; NH film &quot; from JX Nikkoseki Energy Co., , A completely biaxially oriented film sold by Sumitomo Chemical Co., Ltd. under the trade name of &quot; VAC film &quot;, and a film of Sumitomo Chemical Co., Quot; new VAC film &quot;, both of which are incorporated herein by reference.

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

[2] Pressure-sensitive adhesive layer

The pressure sensitive adhesive layer 20 laminated on at least one surface of the optical film 10 is composed of a pressure sensitive adhesive composition comprising a (meth) acrylic resin (A), a silane compound (B) and an ionic compound (C) (D) isocyanate-based crosslinking agent. In the pressure-sensitive adhesive composition, the silane compound (B) is a silane compound represented by the following formula (I).

In the formulas, 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 - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or -C (= O) -, R ¹ represents an alkyl group having 1 to 5 carbon atoms, R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 5 carbon atoms or an alkyl group having 1 to 5 carbon atoms &Lt; / RTI &gt;

In the pressure-sensitive adhesive composition, the ionic compound (C) is a compound composed of a cation and an anion, and the anion is an anion selected from the following group.

According to the pressure-sensitive adhesive layer 20 composed of the pressure-sensitive adhesive composition described above, even when the pressure-sensitive adhesive layer 20 is disposed on a substrate having a structure including a metal layer, corrosion of the metal layer can be suppressed, The durability of the film 1 and the optical laminate including the film 1 can be enhanced. Further, according to the pressure-sensitive adhesive layer 20 composed of the pressure-sensitive adhesive composition described above, the pressure-sensitive adhesive layer-attached optical film 1 and the optical laminate including the pressure-sensitive adhesive layer have a constitution in which the pressure-sensitive adhesive layer 20 is directly bonded to the polarizer 2 It is possible to exhibit good optical durability. Hereinafter, the property that corrosion of the metal layer can be suppressed is also referred to as &quot; metal corrosion resistance &quot;.

The thickness of the pressure-sensitive adhesive layer 20 is usually 2 to 40 占 퐉 and in view of the durability of the optical film (1) with a pressure-sensitive adhesive layer and the optical laminate including the pressure-sensitive adhesive layer, Preferably 5 to 30 mu m, and more preferably 10 to 25 mu m. If the thickness of the pressure-sensitive adhesive layer 20 is 10 m or more, the followability of the pressure-sensitive adhesive layer 20 with respect to the dimensional change of the optical film 10 becomes good, and if it is 25 m or less,

The pressure-sensitive adhesive layer (20) preferably exhibits a storage elastic modulus of 0.1 to 5 MPa in a temperature range of 23 to 80 캜. Thus, the durability of the optical film (1) with a pressure-sensitive adhesive layer and the optical laminate including the optical film (1) can be improved more effectively. Means that the storage modulus of 0.1 to 5 MPa in a temperature range of 23 to 80 캜 means that the storage modulus is within the above range at any temperature within this range. Since the storage elastic modulus generally decreases with increasing temperature, if the storage elastic modulus at 23 deg. C and 80 deg. C falls within the above range, it can be seen that the storage elastic modulus is within the above range at the temperature within this range. The storage elastic modulus of the pressure-sensitive adhesive layer 20 can be measured using a commercially available viscoelasticity measuring device, for example, a viscoelasticity measuring device "DYNAMIC ANALYZER RDA II" manufactured by REOMETRIC.

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

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

Specific examples of alkyl (meth) acrylates include methyl (meth) acrylate, ethyl (meth) acrylate, n- and i-propyl (meth) acrylate, n-, (Meth) acrylate, n- and i-pentyl acrylate, n- and i-hexyl (meth) acrylate, cyclohexyl (Meth) acrylate, isobornyl (meth) acrylate, n-octyl (meth) acrylate, n- - and i-dodecyl (meth) acrylate, stearyl (meth) acrylate, and the like.

The (meth) acrylic resin (A) is a copolymer of a structural unit derived from an alkyl acrylate (a1) having a glass transition temperature (Tg) of less than 0 ° C of a homopolymer and a structural unit derived from an alkyl acrylate (a2) having a Tg of a homopolymer of 0 ° C or higher It is preferable to contain a constituent unit. This is advantageous in enhancing the resistance to metal corrosion and durability of the optical film (1) with a pressure-sensitive adhesive layer and the optical laminate including the same. The Tg of the homopolymer of the alkyl acrylate may be, for example, a literature value such as POLYMER HANDBOOK (Wiley-Interscience).

Specific examples of the alkyl acrylate (a1) include ethyl acrylate, n- and i-propyl acrylate, n- and i-butyl acrylate, n-pentyl acrylate, n- and i- The number of carbon atoms of an alkyl group such as heptyl acrylate, n- and i-octyl acrylate, 2-ethylhexyl acrylate, n- and i-nonyl acrylate, n- and i- And an alkyl acrylate having about 2 to 12 carbon atoms. As another specific example of the alkyl acrylate (a1), a substituent-containing alkyl acrylate in which a substituent is introduced into an alkyl group in an alkyl acrylate in which the alkyl group has about 2 to 12 carbon atoms may be used. The substituent of the substituent group-containing alkyl acrylate is a group substituting the hydrogen atom of the alkyl group, and specific examples thereof include a phenyl group, an alkoxy group, and a phenoxy group. Specific examples of the substituent-containing alkyl acrylate include 2-methoxyethyl acrylate, ethoxy methyl acrylate, phenoxy ethyl acrylate, phenoxy diethylene glycol acrylate and the like. The alkyl group of the alkyl acrylate (a1) may have an alicyclic structure, but is preferably a linear or branched alkyl group.

The alkyl acrylate (a1) may be used alone or in combination of two or more. Among them, the alkyl acrylate (a1) preferably includes one or more kinds selected from ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate. From the standpoint of trackability and reworkability of the pressure-sensitive adhesive layer 20 of the optical film 1 with a pressure-sensitive adhesive layer to the optical film 10, the alkyl acrylate (a1) preferably includes n-butyl acrylate .

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

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

The content of the constituent unit derived from the alkyl acrylate (a2) in the (meth) acrylic resin (A) is preferably from the viewpoint of the resistance to metal corrosion and the durability of the optical film (1) Is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, still more preferably 20 parts by weight or more, particularly preferably 100 parts by weight or more, based on 100 parts by weight of the total constituent units constituting the (meth) acrylic resin (A) Is at least 25 parts by weight. 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, from the viewpoint of trackability and reworkability of the pressure sensitive adhesive layer 20 to the optical film 10, Or less, and more preferably 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 structural unit derived from the other monomer, or may contain two or more structural units. Specific examples of other monomers are shown below.

1) Monomers having polar functional groups.

Examples of the monomer having a polar functional group include a (meth) acrylate having a substituent such as a hydroxyl group, a carboxyl group, a substituted or unsubstituted amino group, and a heterocyclic group such as an epoxy group. Specific examples include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2- (2-hydroxyethoxy) Monomers having a hydroxyl group such as 2-chloro-2-hydroxypropyl (meth) acrylate, 3-chloro-2-hydroxypropyl (meth) acrylate and diethylene glycol mono (meth) acrylate; Acrylonitrile, acryloylmorpholine, vinylcaprolactam, N-vinyl-2-pyrrolidone, vinylpyridine, tetrahydrofurfuryl (meth) acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, 3,4-epoxycyclohexyl Monomers having a heterocyclic group such as methyl (meth) acrylate, glycidyl (meth) acrylate, and 2,5-dihydrofuran; Monomers having substituted or unsubstituted amino groups such as aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate and dimethylaminopropyl (meth) acrylate; (Meth) acrylic acid, and carboxyethyl (meth) acrylate. Among them, a monomer having a hydroxy group is preferable, and (meth) acrylate having a hydroxy group from the viewpoint of reactivity of the (meth) acrylic resin (A) and the crosslinking agent is more preferable.

(Meth) acrylate having a hydroxyl group and the above-mentioned other polar functional group. From the viewpoint of preventing the peeling strength of the separable film laminated on the outer surface of the pressure-sensitive adhesive layer 20 from being increased, It is preferable that the monomer does not substantially contain the monomer. Further, from the viewpoint of enhancing the corrosion resistance against ITO, it is preferable to substantially not contain a monomer having a carboxyl group. Herein, the phrase "substantially not included" means that the amount is not more than 0.1 part by weight based on 100 parts by weight of all the constituent units constituting the (meth) acrylic resin (A).

2) Acrylamide-based monomer.

Acrylamide, N- (3-hydroxypropyl) acrylamide, N- (4-hydroxybutyl) acrylamide, N- N-dimethylacrylamide, N, N-diethylacrylamide, N-isopropylacrylamide, N- (3-dimethylamino Propyl) acrylamide, N- (1,1-dimethyl-3-oxobutyl) acrylamide, N- [2- (2-oxo-1-imidazolidinyl) ethyl] acrylamide, (Methoxymethyl) acrylamide, N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (1-methylethoxymethyl) Acrylamides such as N- (1-methylpropoxymethyl) acrylamide, N- (2-methylpropoxymethyl) acrylamide [alias: N- (isobutoxymethyl) acrylamide] Amide, N- (1,1-dimethylethoxymethyl) acrylate (2-ethoxyethyl) acrylamide, N- (2-ethoxyethyl) acrylamide, N- [2- (1-methylethoxy) Ethyl] acrylamide, [N- (2-isobutoxyethyl) acrylamide], N- [2- Acrylamide], N- (2-butoxyethyl) acrylamide, N- [2- (1,1-dimethylethoxy) ethyl] acrylamide and the like. Among them, preferred are N- (methoxymethyl) acrylamide, N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (butoxymethyl) Hydroxy-methyl) &lt; / RTI &gt; acrylamide is preferably used.

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

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

4) methacrylamide-based monomer.

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

5) Styrene-based monomer.

Styrene; Alkylstyrenes such as methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene, triethylstyrene, propylstyrene, butylstyrene, hexylstyrene, heptylstyrene and octylstyrene; Halogenated styrenes such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene, and iodostyrene; Nitrostyrene; Acetyl styrene; Methoxystyrene; Divinyl benzene and the like.

6) Vinyl monomer.

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

7) Monomers having a plurality of (meth) acryloyl groups in the molecule.

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

As described above, the (meth) acrylic resin (A) has a structure derived from an alkyl (meth) acrylate in view of durability and metal corrosion resistance of the optical film (1) Unit, it is preferable to include a constituent unit derived from a monomer having a polar functional group. The monomer having a polar functional group is preferably a (meth) acrylate monomer having a polar functional group, and more preferably a monomer having a hydroxyl group. The content of the constituent unit derived from the monomer having a polar functional group is preferably 0.1 to 10 parts by weight, more preferably 0.25 to 5 parts by weight, based on 100 parts by weight of the total constituent units constituting the (meth) acrylic resin (A) By weight, and more preferably 0.5 to 5 parts by weight.

From the viewpoint of reworkability of the optical film (1) with a pressure-sensitive adhesive layer, the (meth) acrylic resin (A) is derived from a methacrylic monomer such as methacrylate (methacrylic acid ester) Specifically, the content of the constituent unit is preferably 10 parts by weight or less in 100 parts by weight of all the constituent units constituting the (meth) acrylic resin (A), and the content of the constituent unit is preferably 10 parts by weight or less, More preferably 5 parts by weight or less, and still more preferably 0.1 parts by weight or less.

The (meth) acrylic resin (A) preferably has a single peak in the weight average molecular weight (Mw) in the range of 1000 to 250,000 on the emission curve in gel permeation chromatography (GPC), and has a Mw of 1,000 to 250,000 , And more preferably contains a structural unit derived from alkyl acrylates (a1) and (a2). The pressure-sensitive adhesive layer 20 using the (meth) acrylic resin (A) as the base polymer is advantageous in enhancing the durability of the pressure-sensitive adhesive layer-attached optical film (1) and the optical laminate including the same. When the number of peaks in the range of Mw is 2 or more, sufficient durability tends not to be obtained.

In order to obtain the number of peaks of the GPC discharge curve in the range of Mw 1000 to 250,000, the discharge curve is obtained according to the GPC measurement conditions described in the embodiment. The term "having a single peak" in the above range of the obtained discharge curve means that it has only one maximum value in the range of Mw 1000 to 250,000. In the present specification, a peak having a S / N ratio of 30 or more is defined as a GPC discharge curve.

The (meth) acrylic resin (A) preferably has a Mw in terms of standard polystyrene by GPC in the range of 500,000 to 250,000, and more preferably in the range of 600,000 to 2,000,000. When the Mw is 500,000 or more, it is advantageous to improve the resistance to metal corrosion and durability of the optical film (1) with a pressure-sensitive adhesive layer and the optical laminate including the same, and the workability of the optical film (1) have. If the Mw is less than 2.5 million, the followability of the pressure-sensitive adhesive layer 20 with respect to the dimensional change of the optical film 10 is improved. The molecular weight distribution represented by the ratio Mw / Mn of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is usually from 2 to 10. [ Mw and Mn of the (meth) acrylic resin (A) are determined according to the GPC measurement conditions described in the section of Examples.

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

The glass transition temperature (Tg) of the (meth) acrylic resin (A) measured by a differential scanning calorimeter (DSC) is preferably -60 to -10 ° C, more preferably -55 to -15 ° C. The Tg within this range is advantageous for improving the resistance to metal corrosion and durability of the optical film (1) with a pressure-sensitive adhesive layer and the optical laminate including the same.

The pressure-sensitive adhesive composition may contain two or more (meth) acrylic resins belonging to the (meth) acrylic resin (A). Further, the pressure-sensitive adhesive composition may contain another (meth) acrylic resin different from the (meth) acrylic resin (A). The content of the (meth) acrylic resin (A) in the total of all the (meth) acrylic resins is preferably from the viewpoints of the resistance to metal corrosion and the durability of the optical film (1) (Meth) acryl-based resin (A) as the base polymer is particularly preferably 70% by weight or more, more preferably 80% by weight or more, and still more preferably 90% .

The (meth) acrylic resin (A) and other (meth) acrylic resins which can be used in combination as needed can be produced by a known method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method or an emulsion polymerization method . In the production of the (meth) acrylic resin, a polymerization initiator is generally used. The polymerization initiator is used in an amount of 0.001 to 5 parts by weight based on 100 parts by weight of the total amount of all the monomers used in the production of the (meth) acrylic resin. Further, the (meth) acrylic resin may be produced by a method in which the polymerization is proceeded with an active energy ray such as ultraviolet rays.

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

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

[2-2] Synthesis of silane compound (B)

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

In the formulas, 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 - constituting the alkanediyl group and the alicyclic hydrocarbon group is -O- or -C (= O) -, R ¹ represents an alkyl group having 1 to 5 carbon atoms, R ² , R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 5 carbon atoms or an alkyl group having 1 to 5 carbon atoms &Lt; / RTI &gt;

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

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

Examples of the alkyl group having 1 to 5 carbon atoms which may form R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ in the above formula (I) include methyl, ethyl, n- and i- -, i- and t-butyl groups, n-, i- and t-pentyl groups, and R ² , R ³ , R ⁴ , R ⁵ and R ⁶ in the formula (I) Examples of the alkoxy group having 1 to 5 carbon atoms that can be constituted include methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, -, and t-pentyloxy groups. The number of carbon atoms of the alkyl group and the alkoxy group is independently preferably 1 to 4, more preferably 1 to 3, still more preferably 1 or 2.

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

Bis (trimethoxysilyl) methane,

Bis (triethoxysilyl) methane,

Bis (tripropoxysilyl) methane,

Bis (tributoxysilyl) methane,

Bis (tripentyloxysilyl) methane,

Bis (dimethoxymethylsilyl) methane,

Bis (dimethoxyethylsilyl) methane,

Bis (dimethoxypropylsilyl) methane,

Bis (diethoxymethylsilyl) methane,

Bis (dipropoxymethylsilyl) methane,

Bis (methoxydimethylsilyl) methane,

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

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

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

Bis (dimethoxyethoxysilyl) methane,

1,2-bis (trimethoxysilyl) ethane,

1,2-bis (triethoxysilyl) ethane,

1,2-bis (tripropoxysilyl) ethane,

1,2-bis (tributoxysilyl) ethane,

1,2-bis (tripentyloxysilyl) ethane,

1,2-bis (dimethoxymethylsilyl) ethane,

1,2-bis (dimethoxyethylsilyl) ethane,

1,2-bis (dimethoxypropylsilyl) ethane,

1,2-bis (dimethoxyethylsilyl) ethane,

1,2-bis (dimethoxypropylsilyl) ethane,

1,2-bis (diethoxymethylsilyl) ethane,

1,2-bis (dipropoxymethylsilyl) ethane,

1,2-bis (methoxydimethylsilyl) ethane,

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

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

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

1,2-bis (dimethoxyethoxysilyl) ethane,

1,3-bis (trimethoxysilyl) propane,

1,3-bis (triethoxysilyl) propane,

1,3-bis (tripropoxysilyl) propane,

1,4-bis (trimethoxysilyl) butane,

1,4-bis (triethoxysilyl) butane,

1,4-bis (tripropoxysilyl) butane,

1,4-bis (tributoxysilyl) butane,

1,4-bis (tripentyloxysilyl) butane,

1,4-bis (dimethoxymethylsilyl) butane,

1,4-bis (dimethoxyethylsilyl) butane,

1,4-bis (dimethoxypropylsilyl) butane,

1,4-bis (diethoxymethylsilyl) butane,

1,4-bis (dipropoxymethylsilyl) butane,

1,4-bis (methoxydimethylsilyl) butane,

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

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

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

1,4-bis (dimethoxyethoxysilyl) butane,

1,5-bis (trimethoxysilyl) pentane,

1,5-bis (triethoxysilyl) pentane,

1,5-bis (tripropoxysilyl) pentane,

1,6-bis (trimethoxysilyl) hexane,

1,6-bis (triethoxysilyl) hexane,

1,6-bis (tripropoxysilyl) hexane,

1,6-bis (tributoxysilyl) hexane,

1,6-bis (tripentyloxysilyl) hexane,

1,6-bis (dimethoxymethylsilyl) hexane,

1,6-bis (dimethoxyethylsilyl) hexane,

1,6-bis (dimethoxypropylsilyl) hexane,

1,6-bis (dimethoxyethylsilyl) hexane,

1,6-bis (dimethoxypropylsilyl) hexane,

1,6-bis (diethoxymethylsilyl) hexane,

1,6-bis (dipropoxymethylsilyl) hexane,

1,6-bis (methoxydimethylsilyl) hexane,

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

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

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

1,6-bis (dimethoxyethoxysilyl) hexane,

1,8-bis (trimethoxysilyl) octane,

1,8-bis (triethoxysilyl) octane,

1,8-bis (tripropoxysilyl) octane,

1,8-bis (tributoxysilyl) octane,

1,8-bis (tripentyloxysilyl) octane,

1,8-bis (dimethoxymethylsilyl) octane,

1,8-bis (dimethoxyethylsilyl) octane,

1,8-bis (dimethoxypropylsilyl) octane,

1,8-bis (dimethoxyethylsilyl) octane,

1,8-bis (dimethoxypropylsilyl) octane,

1,8-bis (diethoxymethylsilyl) octane,

1,8-bis (dipropoxymethylsilyl) octane,

1,8-bis (methoxydimethylsilyl) octane,

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

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

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

1,8-bis (dimethoxyethoxysilyl) octane,

1,10-bis (trimethoxysilyl) decane,

1,12-bis (trimethoxysilyl) dodecane,

1,14-bis (trimethoxysilyl) tetradecane,

1,16-bis (trimethoxysilyl) hexadecane,

1,18-bis (trimethoxysilyl) octadecane,

1,20-bis (trimethoxysilyl) icosan, and the like.

Among them, the silane compound (B) is preferably a silane compound represented by the following general formula (1) or (2), from the viewpoint of the metal corrosion resistance of the optical film (1) with a pressure-sensitive adhesive layer and the optical laminate including the same, Is preferably a silane compound represented by the formula (II).

(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 that can form R ⁷ are the same as described above. The silane compound (B) is more preferably a silane compound represented by the formula (II) wherein m is an integer of 4 to 20, more preferably a silane compound represented by the formula (II) wherein m is an integer of 6 to 8, (Trimethoxysilyl) hexane, 1,8-bis (trimethoxysilyl) octane, 1,6-bis (trimethoxysilyl) hexane, M is an integer of 6 to 8, and OR ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and OR ⁷ are each independently an alkyl group having 1 to 3 carbon atoms (E.g., 1 or 2 carbon atoms) of the silane compound represented by the formula (II). An example of a suitable m is 6 or 8.

The pressure-sensitive adhesive composition may contain one or more silane compounds other than the silane compound (B) represented by the formula (I). Examples of other silane compounds include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltri 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxy Silane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, and the like.

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

3-mercaptopropyltrimethoxysilane-tetramethoxysilane oligomer,

3-mercaptopropyltrimethoxysilane-tetraethoxysilane oligomer,

3-mercaptopropyltriethoxysilane-tetramethoxysilane oligomer,

3-mercaptopropyltriethoxysilane-tetraethoxysilane oligomer

Mercaptopropyl group-containing oligomers such as &lt; RTI ID = 0.0 &gt;

Mercaptomethyltrimethoxysilane-tetramethoxysilane oligomer,

Mercaptomethyltrimethoxysilane-tetraethoxysilane oligomer,

Mercaptomethyltriethoxysilane-tetramethoxysilane oligomer,

Mercaptomethyltriethoxysilane-tetraethoxysilane oligomer &lt; RTI ID = 0.0 &gt;

Mercaptomethyl group-containing oligomers such as &lt; RTI ID = 0.0 &gt;

3-glycidoxypropyltrimethoxysilane-tetramethoxysilane copolymer,

3-glycidoxypropyltrimethoxysilane-tetraethoxysilane copolymer,

3-glycidoxypropyltriethoxysilane-tetramethoxysilane copolymer,

3-glycidoxypropyltriethoxysilane-tetraethoxysilane copolymer,

3-glycidoxypropylmethyldimethoxysilane-tetramethoxysilane copolymer,

3-glycidoxypropylmethyldimethoxysilane-tetraethoxysilane copolymer,

3-glycidoxypropylmethyldiethoxysilane-tetramethoxysilane copolymer,

3-glycidoxypropylmethyldiethoxysilane-tetraethoxysilane copolymer

A 3-glycidoxypropyl group-containing copolymer;

3-methacryloyloxypropyltrimethoxysilane-tetramethoxysilane oligomer,

3-methacryloyloxypropyltrimethoxysilane-tetraethoxysilane oligomer,

3-methacryloyloxypropyltriethoxysilane-tetramethoxysilane oligomer,

3-methacryloyloxypropyltriethoxysilane-tetraethoxysilane oligomer,

3-methacryloyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer,

3-methacryloyloxypropylmethyldimethoxysilane-tetraethoxysilane oligomer,

3-methacryloyloxypropylmethyldiethoxysilane-tetramethoxysilane oligomer,

3-methacryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer

A methacryloyloxypropyl group-containing oligomer;

3-acryloyloxypropyltrimethoxysilane-tetramethoxysilane oligomer,

3-acryloyloxypropyltrimethoxysilane-tetraethoxysilane oligomer,

3-acryloyloxypropyltriethoxysilane-tetramethoxysilane oligomer,

3-acryloyloxypropyltriethoxysilane-tetraethoxysilane oligomer,

3-acryloyloxypropylmethyldimethoxysilane-tetramethoxysilane oligomer,

3-acryloyloxypropylmethyldimethoxysilane-tetraethoxysilane oligomer,

3-acryloyloxypropylmethyldiethoxysilane-tetramethoxysilane oligomer,

3-acryloyloxypropylmethyldiethoxysilane-tetraethoxysilane oligomer

Acryloyloxypropyl group-containing oligomers such as &lt; RTI ID = 0.0 &gt;

Vinyltrimethoxysilane-tetramethoxysilane oligomer,

Vinyltrimethoxysilane-tetraethoxysilane oligomer,

Vinyltriethoxysilane-tetramethoxysilane oligomer,

Vinyltriethoxysilane-tetraethoxysilane oligomer,

Vinyl methyl dimethoxysilane-tetramethoxysilane oligomer,

Vinyl methyl dimethoxysilane-tetraethoxysilane oligomer,

Vinyl methyldiethoxysilane-tetramethoxysilane oligomer,

Vinyl methyldiethoxysilane-tetraethoxysilane oligomer

Vinyl group-containing oligomers such as vinyl group-containing oligomers;

3-aminopropyltrimethoxysilane-tetramethoxysilane copolymer,

3-aminopropyltrimethoxysilane-tetraethoxysilane copolymer,

3-aminopropyltriethoxysilane-tetramethoxysilane copolymer,

3-aminopropyltriethoxysilane-tetraethoxysilane copolymer,

3-aminopropylmethyldimethoxysilane-tetramethoxysilane copolymer,

3-aminopropylmethyldimethoxysilane-tetraethoxysilane copolymer,

3-aminopropylmethyldiethoxysilane-tetramethoxysilane copolymer,

3-Aminopropylmethyldiethoxysilane-tetraethoxysilane copolymer

And the like.

However, from the viewpoint of the resistance to metal corrosion of the optical film 1 with a pressure-sensitive adhesive layer and the optical laminate including the pressure-sensitive adhesive layer, the adhesion between the pressure-sensitive adhesive layer 20 and the metal layer 30, The content of the silane compound (B) is preferably 70% by weight or more, more preferably 80% by weight or more, and still more preferably 90% by weight or more, based on the total amount of all the silane compounds. It is particularly preferable to contain only the silane compound (B) as the compound.

The content of the silane compound (B) in the pressure-sensitive adhesive composition is usually 0.01 to 10 parts by weight, preferably 0.03 to 5 parts by weight, per 100 parts by weight of the (meth) acrylic resin (A) 0.05 to 2 parts by weight, and more preferably 0.1 to 1 part by weight. When the content of the silane compound (B) is 0.01 part by weight or more, the effect of improving the resistance to metal corrosion of the optical film (1) with a pressure-sensitive adhesive layer and the optical laminate including the same, It is easy to obtain an effect of improving adhesion with a substrate or the like. When the content is 10 parts by weight or less, bleeding-out of the silane compound (B) from the pressure-sensitive adhesive layer (20) can be suppressed.

[2-3] Ionic Compound (C)

The pressure-sensitive adhesive composition contains an ionic compound (C). The ionic compound (C) is a compound composed of a cation and an anion, and the anion is an anion selected from the following group.

The cation may be either an organic cation or an inorganic cation. By using the ionic compound (C), not only excellent antistatic property can be imparted to the pressure-sensitive adhesive layer (20) but also excellent metal corrosion resistance and optical durability can be imparted. The pressure-sensitive adhesive composition may contain one or more ionic compounds (C). In the case where the pressure-sensitive adhesive composition contains two or more ionic compounds (C), these anions may be the same or different as long as they are selected from the above-mentioned groups.

Specific examples of the organic cation include a pyridinium cation, an imidazolium cation, a piperidinium cation, a pyrrolidinium cation, a tetrahydropyridinium cation, a dihydropyrimidinium cation, a tetrahydropyrimidinium cation, a dihydropyrimidinium A pyrazolium cation, a pyrazolinium cation, an ammonium cation, a sulfonium cation, a phosphonium cation, and the like. The organic cation may have a substituent. Specific examples of the inorganic cations include alkali metal ions such as lithium cations [Li ⁺ ], sodium cations [Na ⁺ ], potassium cations [K ⁺ ], and cesium cations [Cs ⁺ ]; Alkaline earth metal ions such as beryllium cation [Be ^{2 +} ], magnesium cation [Mg ^{2 +} ], calcium cation [Ca ^{2 +} ] and the like.

Among them, the cation is preferably an organic cation from the viewpoint of compatibility with the (meth) acrylic resin (A), and from the viewpoint of antistatic performance, a cation selected from a pyridinium cation, an imidazolium cation, a piperidinium cation, , A nitrogen atom-containing organic cation such as a tetrahydropyridinium cation, a dihydropyrimidinium cation, a tetrahydropyrimidinium cation, a dihydropyrimidinium cation, a pyrazolium cation, a pyrazolinium cation or an ammonium cation, More preferably a cation having a nitrogen atom-containing heterocyclic structure containing an unsaturated bond.

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

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

The alkyl group which may have a substituent is preferably an alkyl group having 1 to 30 carbon atoms. Specific examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, an octyl group, a decyl group, a dodecyl group, An ethyl group, a propyl group, an isopropyl group, an isopropyl group, an isobutyl group, a sec-butyl group, a t-butyl group, a 1-ethylpentyl group, a cyclopentyl group, a cyclohexyl group, a trifluoromethyl group, Naphthoylmethyl group, 2-naphthoylmethyl group, 4-methylsulfanylphenacyl group, 4-phenylsulfanylphenacyl group, 4-dimethylaminophenacyl group, 4-cyanophenacyl group, 4-methylphenacyl group, A 3-fluorophenacyl group, a 3-trifluoromethylphenacyl group, and a 3-nitrophenacyl group.

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

The aryl group which may have a substituent is preferably an aryl group having 6 to 30 carbon atoms, and specific examples thereof include a phenyl group, a biphenyl group, a 1-naphthyl group, a 2-naphthyl group, Naphthacenyl, 1-indenyl, 2-azulenyl, 9-fluorenyl, terphenyl, quaterphenyl, o-, m-, and p-tolyl groups A silyl group, an o-, m-, and p-cumenyl group, a mesityl group, a pentalenyl group, a binaphthalenyl group, a teranaphthalenyl group, a quaternaphthalenyl group, a heptalenyl group, a biphenylenyl group, Anthracenyl group, anthraquinolyl group, phenanthryl group, phenanthryl group, phenanthryl group, phenanthryl group, phenanthryl group, phenanthryl group, phenanthryl group, phenanthryl group, phenanthryl group, , A triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a playadenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a pentacenyl group, a tetraphenylenyl group, A phenyl group, a hexacenyl group, a rubicenyl group, a coronenyl group, a trinaphthylenyl group, a heptaphenyl group, a heptacenyl group, a pyranthrenyl group, and an obarenyl group.

The heterocyclic group which may have a substituent is preferably an aromatic or aliphatic heterocycle including a nitrogen atom, an oxygen atom, a sulfur atom and a phosphorus atom, and specific examples thereof include a thienyl group, benzo [b] thienyl group , A naphtho [2,3-b] thienyl group, a thienylthienyl group, a furyl group, a pyranyl group, an isobenzofuranyl group, a chlorenyl group, a xanthanyl group, a phenoxathiinyl group, A pyridyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolizinyl group, an isoindolyl group, a 3H-indolyl group, an indolyl group, a 1H-indazolyl group, , 4H-quinolizinyl, isoquinolyl, quinolyl, phthalazinyl, naphthyridinyl, quinoxanilyl, quinazolinyl, cinnolinyl, A carbazolyl group, a? -Carbolinyl group, a phenanthridinyl group, an acridinyl group, a perimidinyl group, a phenanthrolinyl group, a phenazinyl group, a phenanthryl group, An isothiazolyl group, a phenothiazinyl group, an isoxazolyl group, a furazanyl group, a phenoxazinyl group, an isochromanyl group, a chromanyl group, a pyrrolidinyl group, a pyrrolinyl group, an imidazolidinyl group, An imidazolidinyl group, a pyrazolinyl group, a pyrazolinyl group, a piperidyl group, a piperazinyl group, an indolinyl group, an isoindolinyl group, a quinuclidinyl group, a morpholinyl group, and a thioxantholyl group.

An alkyl group which may have a substituent, an alkenyl group which may have a substituent, an alkynyl group which may have a substituent, an aryl group which may have a substituent, and a substituent which may substitute hydrogen atoms of a heterocyclic group which may have a substituent Specific examples include halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; An alkoxy group such as a methoxy group, an ethoxy group or a t-butoxy group; An aryloxy group such as a phenoxy group or a p-tolyloxy group, an alkoxycarbonyl group such as a methoxycarbonyl group, a butoxycarbonyl group, a phenoxycarbonyl group, a vinyloxycarbonyl group or an aryloxycarbonyl group; An acyloxy group such as acetoxy group, propionyloxy group and benzoyloxy group; An acyl group such as an acetyl group, a benzoyl group, an isobutyryl group, an acryloyl group, a methacryloyl group, or a methoxyl group; Alkylsulfanyl groups such as a methylsulfanyl group and a t-butylsulfanyl group; Arylsulfanyl groups such as phenylsulfanyl group and p-tolylsulfanyl group; Alkylamino groups such as methylamino group and cyclohexylamino group; Dialkylamino groups such as dimethylamino group, diethylamino group, morpholino group and piperidino group; Arylamino groups such as phenylamino group and p-tolylamino group; Alkyl groups such as a methyl group, an ethyl group, a t-butyl group and a dodecyl group; An aryl group such as a phenyl group, a p-tolyl group, a xylyl group, a cumenyl group, a naphthyl group, an anthryl group, and a phenanthryl group; A halogen atom, a hydroxyl group, a carboxyl group, a sulfonamide group, formyl group, mercapto group, sulfo group, mesyl group, p-toluenesulfonyl group, amino group, nitro group, nitroso group, cyano group, trifluoromethyl group, Group, a phosphino group, a phosphono group, an alkylsulfonyl group, an arylsulfonyl group, a trialkylammonium group, a dimethylsulfonyl group, and a triphenylphenacylphosphonium group.

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

A suitable example of the ionic compound (C) is as follows from the viewpoints of antistatic performance, metal corrosion resistance and optical durability.

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

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

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

The content of the ionic compound (C) in the pressure-sensitive adhesive composition is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 8 parts by weight, per 100 parts by weight of the (meth) acrylic resin (A) More preferably 0.3 to 5 parts by weight, and 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 to improve the antistatic performance. When the amount is 10 parts by weight or less, the optical film (1) with a pressure-sensitive adhesive layer and the metal corrosion resistance and durability .

In the pressure-sensitive adhesive composition, other antistatic agents can be used together with the above-mentioned ionic compound (C) having an anion. However, the optical film (1) with a pressure-sensitive adhesive layer and the metal corrosion resistance It is preferable that the pressure-sensitive adhesive composition contains only the ionic compound (C) having the above-mentioned predetermined anion as an antistatic agent.

[2-4] Isocyanate Crosslinking Agent (D)

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

The isocyanate-based crosslinking agent (D) is a compound having at least two isocyanato groups (-NCO) in the molecule, and specific examples thereof include tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, Dicyclohexylmethane diisocyanate, adduct xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, naphthalene diisocyanate, and triphenylmethane triisocyanate. The isocyanate-based crosslinking agent (D) can be obtained by reacting a polyvalent alcohol compound adduct of these isocyanate compounds (for example, an adduct of glycerol or trimethylolpropane), an isocyanurate, a biuret type compound, and further a polyether polyol or polyester A urethane prepolymer type isocyanate compound or the like which has been reacted with a polyol, an acrylic polyol, a polybutadiene polyol, a polyisoprene polyol or the like. Among them, particularly preferable are polyether polyol compound adducts of tolylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate or isocyanate compounds thereof, and the durability of the optical film (1) with a pressure-sensitive adhesive layer and the durability , Xylylene diisocyanate or its polyhydric alcohol compound adduct is more preferable.

The content of the isocyanate crosslinking agent (D) is preferably 0.08 to 2.5 parts by weight, more preferably 0.1 to 2 parts by weight (for example, 1 part by weight or less) based on 100 parts by weight of the (meth) acrylic resin (A) to be. When the content of the isocyanate-based crosslinking agent (D) is within this range, it is advantageous in achieving compatibility between the optical film (1) with a pressure-sensitive adhesive layer and the metal corrosion resistance and durability of the optical laminate including the same.

The pressure-sensitive adhesive composition can be used in combination with other crosslinking agents such as an epoxy compound, an aziridine compound, a metal chelate compound, a peroxide, and the like in combination with the isocyanate-based crosslinking agent (D) It is preferable that the pressure-sensitive adhesive composition contains only the isocyanate-based crosslinking agent (D) as the crosslinking agent, and substantially does not substantially contain the peroxide. The phrase "not substantially containing" means that the content of the (meth) acrylic resin (A) is 0.01 part by weight or less.

[2-5] Other components

The pressure-sensitive adhesive composition may contain one or more additives such as a solvent, a crosslinking catalyst, an ultraviolet absorber, a weathering stabilizer, a tackifier, a plasticizer, a softener, a dye, a pigment, an inorganic filler and a light scattering fine particle. In addition, it is also useful to form a pressure-sensitive adhesive layer by blending an ultraviolet curing compound in the pressure-sensitive adhesive composition and curing the pressure-sensitive adhesive layer by irradiating ultraviolet rays after forming the pressure-sensitive adhesive layer. Examples of the crosslinking catalyst include amine-based catalysts such as hexamethylenediamine, ethylenediamine, polyethyleneimine, hexamethylenetetramine, diethylenetriamine, triethylenetetramine, isophoronediamine, trimethylenediamine, polyamino resin and melamine resin Compounds.

The pressure-sensitive adhesive composition may contain an optical film (1) having a pressure-sensitive adhesive layer and an antirust agent capable of enhancing the resistance to metal corrosion of the optical laminate including the pressure-sensitive adhesive layer. Examples of the rust preventive include triazole-based compounds such as benzotriazole-based compounds and other triazole-based compounds; Thiazole-based compounds such as benzothiazole-based compounds and other thiazole-based compounds; Imidazole-based compounds such as benzylimidazole-based compounds and other imidazole-based compounds; Imidazoline-based compounds; Quinoline compounds; Pyridine-based compounds; Pyrimidine-based compounds; Indole-based compounds; Amine-based compounds; Urea compound; Sodium benzoate; Benzyl mercapto compounds; Di-sec-butylsulfide; And diphenyl sulfoxide.

However, according to the present invention, since sufficient metal corrosion resistance can be obtained without containing an antirusting agent, the content of the antirusting agent is preferably as small as possible. In particular, the pressure-sensitive adhesive composition preferably contains substantially no triazole-based compound as a rust preventive agent, and more preferably contains substantially no rust preventive selected from the above-mentioned group of compounds. The phrase "not substantially containing" means that the content of the (meth) acrylic resin (A) is 0.01 part by weight or less.

[3] Construction and production method of optical film with pressure-sensitive adhesive layer

The optical film (1) with a pressure-sensitive adhesive layer includes an optical film (10) and a pressure-sensitive adhesive layer (20) laminated on at least one side thereof (Fig. The pressure-sensitive adhesive layer 20 may be laminated on both sides of the optical film 10. Normally, the pressure-sensitive adhesive layer 20 is directly laminated on the surface of the optical film 10. When the pressure-sensitive adhesive layer 20 is formed on the surface of the optical film 10, a primer layer is formed on the bonding surface of the optical film 10 and / or a bonding surface of the pressure-sensitive adhesive layer 20, Treatment, corona treatment or the like is preferably carried out, and it is more preferable to conduct the corona treatment.

In the case where the optical film 10 is a one-side protective polarizing plate as shown in Fig. 2, the pressure-sensitive adhesive layer 20 usually has a polarizing plane, that is, a polarizing plane on the side opposite to the first resin film 3 in the polarizer 2 Plane, preferably directly laminated. In the case where the optical film 10 is a double-side protective polarizing plate as shown in Fig. 3, the pressure-sensitive adhesive layer 20 may be laminated on the outer surface of either one of the first and second resin films 3 and 4, Or the like.

An antistatic layer may be separately formed between the optical film 10 and the pressure-sensitive adhesive layer 20. However, since the pressure-sensitive adhesive layer 20 of the present invention can give excellent antistatic properties to the pressure-sensitive adhesive layer alone, It is preferable that no antistatic layer is provided between the optical film 10 and the pressure-sensitive adhesive layer 20 from the viewpoint of simplification of the thinning process or the laminate production process.

The optical film (1) with a pressure-sensitive adhesive layer may include a separate film (release film) laminated on the outer surface of the pressure-sensitive adhesive layer (20). The separator film is usually peeled off at the time of using the pressure-sensitive adhesive layer 20 (for example, when the pressure-sensitive adhesive layer 20 is laminated on the metal layer 30). The separating film may be one in which a release treatment such as a silicone treatment is performed on the surface of the film formed of various resins such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, and polyarylate, on which the pressure-sensitive adhesive layer 20 is formed have.

The optical film (1) with a pressure-sensitive adhesive layer is prepared by dissolving or dispersing the respective components constituting the pressure-sensitive adhesive composition in a solvent to obtain a pressure-sensitive adhesive composition containing a solvent and then coating the surface of the optical film (10) Layer 20 as shown in FIG. The optical film (1) with a pressure-sensitive adhesive layer is obtained by forming a pressure-sensitive adhesive layer (20) on the release-treated surface of the separate film in the same manner as described above, and laminating .

&Lt; Optical laminate &

Figs. 4 and 5 are schematic sectional views showing examples of the layer structure of the optical laminate according to the present invention. 4 and 5, an optical laminate according to an embodiment of the present invention includes an optical film 1 with a pressure-sensitive adhesive layer and a metal layer 30 laminated on the pressure-sensitive adhesive layer 20 side . The optical laminate 5 shown in Fig. 4 is an example in which the polarizing plate 10a shown in Fig. 2 is used as the optical film 10, and the optical laminate 6 shown in Fig. Is used as the optical film 10. The optical film 1 with a pressure-sensitive adhesive layer is formed on the metal layer 30 such that the pressure-sensitive adhesive layer 20 directly contacts the metal layer 30 in the optical laminate 5, 6 shown in Figs. 4 and 5 Respectively. According to the present invention, corrosion of the metal layer 30 can be effectively suppressed even in the optical laminate having such a constitution that the pressure-sensitive adhesive layer 20 is in direct contact with the metal layer 30.

6 is a schematic cross-sectional view showing another example of the layer structure of the optical laminate according to the present invention. In another embodiment, the optical laminate according to the present invention is such that the pressure-sensitive adhesive layer 20 of the optical film 1 with a pressure-sensitive adhesive layer, as in the case of the optical laminate 7 shown in Fig. 6, And is laminated on the metal layer 30. The pressure-sensitive adhesive layer (20) is in direct contact with the resin layer (50). Also in this optical laminate 7, corrosion of the metal layer 30 can be effectively suppressed. The resin layer 50 disposed between the pressure-sensitive adhesive layer 20 and the metal layer 30 may be, for example, a cured layer of a curable resin. As the curable resin capable of forming the resin layer 50, those known in the art can be used and those described in, for example, JP-A-2009-217037 can be used.

7 is a schematic cross-sectional view showing another example of the layer structure of the optical laminate according to the present invention. In another embodiment, the optical laminate according to the present invention does not need to have the metal layer 30 like the optical laminate 8 shown in Fig. In this case, the pressure-sensitive adhesive layer 20 of the optical film 1 with a pressure-sensitive adhesive layer is laminated on the substrate 40, for example. The substrate 40 is, for example, a glass substrate as described later.

The metal layer 30 is selected from the group consisting of aluminum, copper, silver, gold, iron, tin, zinc, nickel, molybdenum, chromium, tungsten, lead and alloys comprising two or more metals selected therefrom It may be a layer containing at least one kind of metal element and is preferably a layer containing a metal element selected from the group consisting of aluminum, copper, silver and gold from the viewpoint of conductivity. In view of conductivity and cost, Is a layer containing an aluminum element, and more preferably a layer containing an aluminum element as a main component. As a main component, it is meant that the metal component constituting the metal layer 30 accounts for 30 wt% or more, more preferably 50 wt% or more of the total metal components.

The metal layer 30 may be a metal oxide layer such as ITO or the like. However, the optical film 1 with a pressure-sensitive adhesive layer according to the present invention is excellent in corrosion resistance against a metal substrate or an alloy, Mentioned metal element and / or an alloy containing two or more of the above-mentioned metal elements. Note that the optical laminate may have a transparent electrode layer made of a metal oxide such as ITO together with the metal layer 30. [

The shape (for example, thickness, etc.) and the method of preparing the metal layer 30 are not particularly limited and may be a metal foil, a vacuum vapor deposition method, a sputtering method, an ion plating method, an inkjet printing method, or a gravure printing method , Preferably a metal layer formed by a sputtering method, an inkjet printing method, or a gravure printing method, and more preferably a metal layer formed by sputtering. In the metal layer and the metal foil formed by sputtering, the former tends to have poor corrosion resistance. However, according to the optical laminate of the present invention, the metal layer formed by sputtering also has a good metal corrosion resistance. The thickness of the metal layer 30 is usually 3 占 퐉 or less, preferably 1 占 퐉 or less, and more preferably 0.8 占 퐉 or less. The thickness of the metal layer 30 is usually 0.01 m or more. When the metal layer 30 is a metal wiring layer, the line width of the metal interconnection of the metal interconnection layer is usually 10 占 퐉 or less, preferably 5 占 퐉 or less, and more preferably 3 占 퐉 or less. The line width of the metal wiring is usually 0.01 占 퐉 or more, preferably 0.1 占 퐉 or more, and more preferably 0.5 占 퐉 or more. The optical laminate according to the present invention also exhibits good resistance to metal corrosion, with respect to the thin metal layer 30 and the thin metal layer 30. Particularly, even when the metal wiring is formed by sputtering, for example, when the thickness is 3 mu m or less and the line width is 10 mu m or less, or when the thickness is 3 mu m or less and the line width is 10 mu m or less, .

The metal layer 30 may be, for example, a metal wiring layer (i.e., electrode layer) of a touch input element of a touch input type liquid crystal display device. In this case, the metal layer 30 is typically patterned in a predetermined shape. Fig. 8 shows an example in which the metal layer 30 is a metal wiring layer. In the optical laminate shown in Fig. 8, the resin layer 50 may be omitted. When the pressure-sensitive adhesive layer 20 is laminated on the patterned metal layer 30, the pressure-sensitive adhesive layer 20 may have a portion which is not in contact with the metal layer 30. The metal layer 30 may be a continuous film containing the metal or alloy.

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

4 and 5, the metal layer 30, for example, a metal wiring layer may be formed on the substrate 40. In this case, the optical laminate according to the present invention includes the substrate 40 . The formation of the metal layer 30 on the substrate 40 can be performed, for example, by 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 non-alkali glass. The metal layer 30 may be formed on the entire surface of the substrate 40 or may be formed on a part thereof. In the case where the metal layer 30 is formed on a part of the surface of the substrate 40 such as a case where the patterned metal layer 30 is formed on the substrate 40, a part of the pressure- Since the pressure-sensitive adhesive layer 20 of the optical laminate according to the present invention is excellent in adhesion with glass, the optical laminate and the liquid crystal display device having the optical laminate are excellent in adhesion Is excellent in durability in the case of the above.

The optical laminate 5, 6 can be obtained by bonding the optical film 1 with the pressure-sensitive adhesive layer on the metal layer 30 (or the resin layer) through the pressure-sensitive adhesive layer 20. The optical film 1 with a pressure-sensitive adhesive layer is peeled off from the metal layer 30, and the pressure-sensitive adhesive layer-attached optical film 1 is peeled off from the metal layer 30, A so-called rework operation may be required in which the optical film (1) with a pressure-sensitive adhesive layer is attached again to the metal layer (30). The optical film (1) with a pressure-sensitive adhesive layer according to the present invention is free from blurring and adhesive residue on the surface of the metal layer (30) after being peeled off from the metal layer (30). According to the optical film (1) with a pressure-sensitive adhesive layer according to the present invention, even when the surface to which the pressure-sensitive adhesive layer (20) is bonded is not a metal layer (30) but a glass substrate or an ITO layer, good reworkability can be exhibited.

<Liquid Crystal Display Device>

The liquid crystal display device according to the present invention includes the optical film (1) with a pressure-sensitive adhesive layer according to the present invention, and more typically includes the optical laminate. The liquid crystal display device according to the present invention can suppress corrosion of the metal layer 30 and exhibits good durability.

The liquid crystal display device according to the present invention is preferably a touch input type liquid crystal display device having a touch panel function. The touch input type liquid crystal display device includes a touch input element including a liquid crystal cell and a backlight. The configuration of the touch panel may be any conventionally known method such as an out-cell type, an on-cell type, an in-cell type, and the operation method of the touch panel may be a resistive type, a capacitive type (surface type capacitance type, ), Or any other conventionally known method. The optical film (1) with a pressure-sensitive adhesive layer according to the present invention may be disposed on the viewer side of the touch input element (liquid crystal cell), on the backlight side, or on both sides. The driving method of the liquid crystal cell may be any conventionally known method such as a TN method, a VA method, an IPS method, a multi-domain method, and an OCB method. In the liquid crystal display device according to the present invention, the substrate 40 included in the optical stacks 5 and 6 may be a substrate (typically, a glass substrate) included in the liquid crystal cell.

Example

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. Hereinafter, the parts and percentages used for indicating the amount and content are based on the weight unless otherwise specified.

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

Into a reaction vessel equipped with a cooling tube, a nitrogen introducing tube, a thermometer and a stirrer, a solution obtained by mixing the monomers of the composition shown in Table 1 (the weight parts in Table 1) with 81.8 parts of ethyl acetate was injected. After the air in the reaction vessel was replaced with nitrogen gas, the internal temperature was set to 60 占 폚. Thereafter, a solution prepared by dissolving 0.12 part of azobisisobutyronitrile in 10 parts of ethyl acetate was added. After being maintained at the same temperature for 1 hour, ethyl acetate was continuously added to the reaction vessel so that the concentration of the polymer was approximately 35% at an addition rate of 17.3 parts / Hr while maintaining the internal temperature at 54 to 56 ° C. (Meth) acrylic resin (A-1) was obtained by adjusting the concentration of the polymer to 20% by adding ethyl acetate after maintaining the internal temperature at 54 to 56 ° C until 12 hours elapsed from the start of the addition of ethyl acetate, Of an ethyl acetate solution. The weight average molecular weight (Mw) of the (meth) acrylic resin (A-1) was 139,000 and the ratio Mw / Mn of the weight average molecular weight (Mw) to the number average molecular weight (Mn) was 5.32. In the discharge curve of gel permeation chromatography (GPC), the component of Mw 1.39 million exhibited a single peak, and no other peak was observed in the range of Mw 1000 to 250,000.

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

An ethyl acetate solution of a (meth) acrylic resin (A-2) was obtained in the same manner as in Preparation Example 1 except that the composition of the monomers was changed as shown in Table 1 (resin concentration: 20%). (Meth) acrylic resin (A-2) had a weight average molecular weight (Mw) of 1,410,000 and an Mw / Mn of 4.71. In the discharge curve of GPC, the component of Mw of 1.14 million exhibited a single peak, and no other peak was observed in the range of Mw 1000 to 250,000.

The weight average molecular weight (Mw) and the number average molecular weight (Mn) of the preparation examples were measured by using GPC apparatus equipped with four TSKgel XL columns manufactured by Tosoh Corporation, Shodex GPC KF-802 &quot; were connected in series. Using tetrahydrofuran as the eluent, a sample concentration of 5 mg / ml, a sample introduction amount of 100 占 퐇, a temperature of 40 占 폚, a flow rate of 1 ml / min Lt; RTI ID = 0.0 &gt; polystyrene &lt; / RTI &gt; The conditions for obtaining the discharge curve of GPC were the same.

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

The number of peaks (expressed as &quot; GPC peak number &quot; in Table 1) in the range of Mw 1,000 to 250,000 on the discharge curve of GPC and the composition of the monomers in each production example Respectively.

The abbreviations in the column "monomer composition" in Table 1 mean the following monomers.

BA: butyl acrylate (glass transition temperature of homopolymer: -54 DEG C),

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

HEA: 2-hydroxyethyl acrylate.

<Examples 1 to 8 and Comparative Examples 1 to 9>

(1) Preparation of pressure-sensitive adhesive composition

The silane compound (B), the ionic compound (C) and the isocyanate (C) shown in Table 2 were added to an ethyl acetate solution (resin concentration: 20%) of the (meth) acrylic resin obtained in the above- (D) were mixed in amounts shown in Table 2, respectively, and ethyl acetate was added so that the solid concentration became 14% to obtain a pressure-sensitive adhesive composition. The compounding amounts of the respective blending ingredients shown in Table 2 are the number of parts by weight as an active ingredient contained in the case where the used product contains a solvent or the like.

Details of each compounding ingredient represented by abbreviations in Table 2 are as follows.

(Silane compound)

B-1: a silane compound represented by the following formula:

B-2: a silane compound represented by the following formula:

B-3: 3-glycidoxypropyltrimethoxysilane, trade name &quot; KBM403 &quot; obtained from Shinetsu Kagaku Kogyo Co.,

(Ionic compound)

C-1: an ionic compound represented by the following formula:

C-2: ionic compound represented by the following formula:

C-3: Lithium bis (trifluoromethanesulfonyl) imide,

C-4: Potassium bis (fluorosulfonyl) imide,

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

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

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

C-8: N-Octyl-4-methylpyridinium hexafluorophosphate.

(Isocyanate-based crosslinking agent)

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

(2) Production of pressure-sensitive adhesive layer

Each of the pressure-sensitive adhesive compositions prepared in (1) above was applied to the release treated surface of a separator film (trade name "PLR-382051" available from LINTEC CO., LTD.) Made of a polyethylene terephthalate film subjected to release treatment, To a thickness of 20 m, and dried at 100 DEG C for 1 minute to prepare a pressure-sensitive adhesive layer (pressure-sensitive adhesive sheet).

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

A polyvinyl alcohol film having an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% and a thickness of 60 mu m (trade name: Kurarabinetron VF-PE # 6000, manufactured by Kuraray Co., Ltd.) was immersed in pure water at 37 캜, And 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 (potassium iodide / boric acid / water (weight ratio) = 12 / 3.6 / 100) containing potassium iodide and boric acid at 56.5 캜. The film was washed with pure water at 10 캜 and then dried at 85 캜 to obtain a polarizer having a thickness of about 23 탆 in which iodine was adsorbed and oriented in polyvinyl alcohol. The stretching was carried out mainly in a step of iodine dyeing and boric acid treatment, and the total stretching magnification was 5.3 times.

A transparent protective film (trade name &quot; KC2UA &quot;, manufactured by Konica Minolta Opto) of a triacetyl cellulose film having a thickness of 25 mu m was bonded to one surface of the obtained polarizer through an adhesive comprising an aqueous solution of a polyvinyl alcohol-based resin. Next, a zero-phase retardation film (trade name "ZEONOR", manufactured by Nippon Zeon Co., Ltd.) consisting of a ring-shaped polyolefin resin having a thickness of 23 μm was laminated on the surface opposite to the triacetylcellulose film in the polarizer, And then bonded via an adhesive composed of an aqueous solution of a resin to prepare a polarizing plate. Subsequently, a corona discharge treatment for improving adhesion was performed on the surface of the zero-retardation film opposite to the surface that the polarizer was in contact with, and then the surface of the pressure-sensitive adhesive layer (2) opposite to the separator film Layer surface) was bonded by a laminator, and then cured for 7 days at a temperature of 23 캜 and a relative humidity of 65% to obtain an optical film (P-1) with a pressure-sensitive adhesive layer.

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

A polyvinyl alcohol film having an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% and a thickness of 30 mu m (trade name "Kurarabinylon VF-PE # 3000" manufactured by Kuraray Co., Ltd.) was immersed in pure water at 37 ° C, And 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 (potassium iodide / boric acid / water (weight ratio) = 12 / 3.6 / 100) containing potassium iodide and boric acid at 56.5 캜. The film was washed with pure water at 10 캜 and then dried at 85 캜 to obtain a polarizer having a thickness of about 12 탆 in which iodine was adsorbed and oriented in polyvinyl alcohol. The stretching was carried out mainly in a step of iodine dyeing and boric acid treatment, and the total stretching magnification was 5.3 times.

A transparent protective film (trade name "KC2UA", manufactured by Konica Minolta Opto) of a triacetyl cellulose film having a thickness of 25 μm was bonded to one surface of the obtained polarizer through an adhesive comprising an aqueous solution of a polyvinyl alcohol resin to form a polarizing plate Respectively. Subsequently, a surface (pressure-sensitive adhesive layer side) opposite to the separator film of the pressure-sensitive adhesive layer prepared in the above (2) was bonded to the surface opposite to the surface to which the protective film of the polarizer was adhered by a laminator, , And a relative humidity of 65% for 7 days to obtain an optical film (P-2) having a pressure-sensitive adhesive layer.

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

The optical film (P-1) with a pressure-sensitive adhesive layer prepared in the above (3) was cut into a test piece having a size of 20 mm x 50 mm and adhered to the metal layer side of the glass substrate with a metal layer through a pressure sensitive adhesive layer. On the glass substrate with a metal layer, a glass substrate (manufactured by Geomatech) in which a metal aluminum layer having a thickness of about 500 nm was laminated on the alkali-free glass surface by sputtering was used. The obtained optical laminate was stored in an oven at a temperature of 60 DEG C and a relative humidity of 90% for 500 hours. Then, the state of the metal layer at the portion to which the optical film with the pressure-sensitive adhesive layer was adhered was irradiated with light from the back surface of the glass substrate, Loupe), and the formula (generation of holes having a diameter of 0.1 mm or more and capable of transmitting light) was evaluated according to the following criteria. The results are shown in Table 3.

5: No formal or cloudy appearance on the metal layer surface,

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

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

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

1: Many formulations are formed on the surface of the metal layer surface and also clouding occurs.

(6) Durability evaluation of optical film with pressure-sensitive adhesive layer

The pressure-sensitive adhesive layer-bearing optical film (P-1) prepared in the above (3) was cut into a size of 200 mm x 150 mm so that the stretching axis direction of the polarizing plate was long side, Respectively. The test piece to which the obtained glass substrate was adhered (optical film with a pressure-sensitive adhesive layer to which the glass substrate was adhered) was pressed in an autoclave at a temperature of 50 캜 and a pressure of 5 kg / cm 2 (490.3 kPa) for 20 minutes. As the glass substrate, "Eagle XG", trade name of alkali-free glass manufactured by Corning Inc. was used. The following three kinds of durability tests were performed on the obtained optical laminate.

[Durability test]

· Heat resistance test held for 750 hours under dry conditions at 85 ℃,

· Moisture resistance test in which the sample is held for 750 hours in an environment of a temperature of 60 ° C and a relative humidity of 90%

An internal heat shock (HS) test in which the operation of maintaining the temperature for 30 minutes under a drying condition of 85 ° C and the holding for 30 minutes under a drying condition of -40 ° C is repeated for 400 cycles.

The optical laminate after each test was visually observed, and the durability was evaluated according to the following evaluation criteria by visually observing the appearance change such as lifting, peeling, foaming and the like of the pressure-sensitive adhesive layer. The results are shown in Table 3.

4: No change in appearance such as peeling, peeling, foaming,

3: Almost no change in appearance such as peeling, peeling, and foaming,

2: Appearance changes such as peeling, peeling, and foaming are slightly visible,

1: Appearance change such as peeling, peeling, and foaming was confirmed remarkably.

(7) Evaluation of lithographic properties of optical film with pressure-sensitive adhesive layer

The optical film (P-1) with a pressure-sensitive adhesive layer prepared in the above (3) was cut into test pieces having a size of 25 mm x 150 mm. The separator was peeled from the test piece, and the adhesive surface was bonded to the glass substrate. The test piece to which the obtained glass substrate was adhered (optical film with a pressure-sensitive adhesive layer to which the glass substrate was adhered) was pressed in an autoclave at a temperature of 50 캜 and a pressure of 5 kg / cm 2 (490.3 kPa) for 20 minutes. Next, the optical film was peeled from the test piece in the direction of 180 DEG at a rate of 300 mm / min together with the pressure-sensitive adhesive layer in an oven at 50 DEG C for 48 hours and in an atmosphere at a temperature of 23 DEG C and a relative humidity of 50%. The state of the surface of the glass substrate after peeling was observed and evaluated according to the following criteria. The results are shown in Table 3.

4: No haze or the like was observed on the surface of the glass substrate,

3: almost no blur or the like was observed on the surface of the glass substrate,

2: haze or the like was confirmed on the surface of the glass substrate,

1: Residue of the pressure-sensitive adhesive layer on the surface of the glass substrate is confirmed.

(8) Evaluation of discoloration of optical film with pressure-sensitive adhesive layer

The optical film (P-2) with a pressure-sensitive adhesive layer prepared in the above (4) was cut into a size of 30 mm x 30 mm, the separate film was peeled off, and the exposed pressure-sensitive adhesive layer surface was bonded to the glass substrate. As the glass substrate, "Eagle XG", trade name of alkali-free glass manufactured by Corning Inc. was used. For the obtained optical laminate, MD transmittance and TD transmittance in a wavelength range of 380 to 780 nm were measured using a spectrophotometer (product name "V7100", manufactured by Nippon Bunko Co., Ltd.) equipped with an integrating sphere, And the degree of polarization is also calculated, and the visual sensitivity correction is performed by a 2-degree field of view (C light source) of JIS Z 8701: 1999 "Color display method-XYZ color system and X ₁₀ Y ₁₀ Z ₁₀ color system" The corrected visual sensitivity transmittance (Ty) and visual sensitivity correction polarization degree (Py) were obtained. The optical laminate was set on a spectrophotometer equipped with an integrating sphere so that the side of the triacetylcellulose film of the polarizing plate was on the detector side and light was incident from the glass substrate side.

The mass transmittance and the degree of polarization are respectively defined by the following formulas.

(?) = 0.5 x (Tp (?) + Tc (?))

(?) = 100 × (Tp (?) - Tc (?)) / (Tp (?) + Tc

Tp (?) Is the transmittance (%) of the optical stacked body measured by the relationship between the linearly polarized light of the incident wavelength? (Nm) and the parallel Nicol, Tc (?) Is the linearly polarized light of the incident wavelength? Is the transmittance (%) of the optical laminate measured in relation to the crossed Nicol.

Subsequently, the optical laminate was left for 24 hours in a humidified atmosphere at a temperature of 80 DEG C and a relative humidity of 90% for 24 hours under an environment of a temperature of 23 DEG C and a relative humidity of 60%, and then subjected to an endurance test Ty and Py were obtained. Thereafter, Py and Ty before the test were respectively subtracted from the Py and Ty after the test, and the amount of change before and after the endurance test was calculated, and the degree of polarization degree of change (ΔPy) and the amount of change in the unit transmissivity (ΔTy) were obtained. Table 3 shows ΔPy.

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

Into a reaction vessel equipped with a cooling tube, a nitrogen inlet tube, a thermometer and a stirrer, a solution obtained by mixing the monomer shown in Table 4 (the numerical value in Table 4 is the weight part) with 81.8 parts of ethyl acetate was injected. After the air in the reaction vessel was replaced with nitrogen gas, the internal temperature was set to 60 占 폚. Thereafter, a solution prepared by dissolving 0.12 part of azobisisobutyronitrile in 10 parts of ethyl acetate was added. After maintaining at the same temperature for 1 hour, ethyl acetate was added continuously to the reaction vessel so that the concentration of the polymer was almost 35% at an addition rate of 17.3 parts / Hr while maintaining the internal temperature at 54 to 56 ° C. (Meth) acrylic resin (A-1) was obtained by adjusting the concentration of the polymer to 20% by adding ethyl acetate after maintaining the internal temperature at 54 to 56 ° C until 12 hours elapsed from the start of the addition of ethyl acetate, Of an ethyl acetate solution. The weight average molecular weight (Mw) of the (meth) acrylic resin (A-1) was 139,000 and the ratio Mw / Mn of the weight average molecular weight (Mw) to the number average molecular weight (Mn) was 5.32. In the discharge curve of gel permeation chromatography (GPC), the component of Mw 1.39 million exhibited a single peak, and no other peak was observed in the range of Mw 1000 to 250,000.

The weight average molecular weight (Mw) and the number average molecular weight (Mn) of the preparation examples were measured by using GPC apparatus equipped with four TSKgel XL columns manufactured by Tosoh Corporation, Shodex GPC KF-802 &quot; were connected in series. Using tetrahydrofuran as the eluent, a sample concentration of 5 mg / ml, a sample introduction amount of 100 占 퐇, a temperature of 40 占 폚, a flow rate of 1 ml / min Lt; RTI ID = 0.0 &gt; polystyrene &lt; / RTI &gt; The conditions for obtaining the discharge curve of GPC were the same.

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

(Number of GPC peaks in Table 4) in the range of Mw 1,000-2,500,000 on the discharge curve of GPC and the composition of the monomers in each production example Respectively.

The abbreviations in the "monomer composition" column in Table 4 mean the following monomers.

BA: butyl acrylate (glass transition temperature of homopolymer: -54 DEG C),

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

HEA: 2-hydroxyethyl acrylate,

&Lt; Example 9, Comparative Examples 10 to 11 >

(1) Preparation of pressure-sensitive adhesive composition

The silane compound (B), the ionic compound (C) and the isocyanate compound (C) shown in Table 5 were added to the ethyl acetate solution (resin concentration: 20%) of the (meth) acrylic resin obtained in the above- (D) shown in Table 5 were mixed in the amounts shown in Table 5, and ethyl acetate was added so that the solid concentration became 14% to obtain a pressure-sensitive adhesive composition. The compounding amounts of the respective blending ingredients shown in Table 5 are the number of parts by weight as the active ingredient contained in the case where the used product contains a solvent or the like.

Details of each compounding ingredient represented by abbreviations in Table 5 are as follows.

(Silane compound)

B-1: a silane compound represented by the following formula:

B-3: 3-glycidoxypropyltrimethoxysilane, trade name &quot; KBM403 &quot; obtained from Shinetsu Kagaku Kogyo Co.,

(Ionic compound)

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

C-8: N-Octyl-4-methylpyridinium hexafluorophosphate.

(Isocyanate-based crosslinking agent)

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

(2) Production of pressure-sensitive adhesive layer

Each of the pressure-sensitive adhesive compositions prepared in (1) above was applied to the release treated surface of a separator film (trade name "PLR-382051" available from LINTEC CO., LTD.) Made of a polyethylene terephthalate film subjected to release treatment, To a thickness of 20 m, and dried at 100 DEG C for 1 minute to prepare a pressure-sensitive adhesive layer (pressure-sensitive adhesive sheet).

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

A polyvinyl alcohol film having an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% and a thickness of 60 mu m (trade name: Kurarabinetron VF-PE # 6000, manufactured by Kuraray Co., Ltd.) was immersed in pure water at 37 캜, And 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 (potassium iodide / boric acid / water (weight ratio) = 12 / 3.6 / 100) containing potassium iodide and boric acid at 56.5 캜. The film was washed with pure water at 10 캜 and then dried at 85 캜 to obtain a polarizer having a thickness of about 23 탆 in which iodine was adsorbed and oriented in polyvinyl alcohol. The stretching was carried out mainly in a step of iodine dyeing and boric acid treatment, and the total stretching magnification was 5.3 times.

A transparent protective film (trade name &quot; KC2UA &quot;, manufactured by Konica Minolta Opto) of a triacetyl cellulose film having a thickness of 25 mu m was bonded to one surface of the obtained polarizer through an adhesive comprising an aqueous solution of a polyvinyl alcohol-based resin. Next, a zero-phase difference film (trade name "ZEONOR", manufactured by Nippon Zeon Co., Ltd.) consisting of a ring-shaped polyolefin resin having a thickness of 23 μm was laminated on the surface of the polarizer opposite to the triacetylcellulose film, To prepare a polarizing plate. Subsequently, the surface of the zero-retardation film opposite to the side on which the polarizer is touched was subjected to a corona discharge treatment for improving the adhesion, and then the surface of the pressure-sensitive adhesive layer (2) opposite to the separator film ) Was laminated by a laminator, and then cured for 7 days at a temperature of 23 캜 and a relative humidity of 65% to obtain an optical film (P-1) with a pressure-sensitive adhesive layer.

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

The optical film (P-1) with a pressure-sensitive adhesive layer prepared in the above (3) was cut into a test piece having a size of 20 mm x 50 mm and adhered to the metal layer side of the glass substrate with a metal layer through a pressure sensitive adhesive layer. On a glass substrate with a metal layer, a glass substrate (manufactured by Geomatec Co., Ltd.) in which a silver alloy having a thickness of about 500 nm (an alloy containing palladium and copper and containing an alloy of copper and APC) having a thickness of about 500 nm was laminated on a non- Respectively. After the obtained optical laminate was stored in an oven at a temperature of 60 DEG C and a relative humidity of 90% for 500 hours, the state of the metal layer of the portion to which the optical film with the pressure-sensitive adhesive layer was adhered was irradiated with light from the back surface of the glass substrate, , And the formulas (occurrence of holes having a diameter of 0.1 mm or more and capable of transmitting light) were evaluated according to the following criteria. The results are shown in Table 6.

5: No formal or cloudy appearance on the metal layer surface,

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

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

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

1: Many formulations are formed on the surface of the metal layer surface and also clouding occurs.

1: Optical film with a pressure-sensitive adhesive layer, 2: Polarizer, 3: First resin film, 4: Second resin film, 5,6,7,8: Optical laminate, 10: Optical film, 10a, : Pressure-sensitive adhesive layer, 30: metal layer, 40: substrate, 50: resin layer.

Claims (18)

An optical film and a pressure-sensitive adhesive layer laminated on at least one side thereof,
The pressure-sensitive adhesive layer is composed of a pressure-sensitive adhesive composition comprising a (meth) acrylic resin (A), a silane compound (B) and an ionic compound (C)
The silane compound (B) is represented by the following formula (I):

(Wherein A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the alkanediyl group and -CH ₂ - constituting the alicyclic hydrocarbon group are -O- or - R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a substituted or unsubstituted alkyl group having 1 to ⁵ carbon atoms An alkoxy group having 1 to 5 carbon atoms.
Is a silane compound represented by the formula
The anion of the ionic compound (C)

Wherein the anion is an anion selected from the group consisting of: The positive resist composition according to claim 1, wherein the silane compound (B) represented by the formula (I) is represented by the following formula (II):

(Wherein R ¹ , R ³ , R ⁴ , R ⁵ and R ⁶ each have the same meaning as defined above, R ⁷ represents an alkyl group having 1 to 5 carbon atoms, and m represents an integer of 1 to 20)
Wherein the pressure-sensitive adhesive layer is a silane compound. The optical film with a pressure-sensitive adhesive layer according to claim 2, wherein m in the formula (II) is an integer of 4 to 20. The optical film with a pressure-sensitive adhesive layer according to claim 2, wherein m in the formula (II) is an integer of 6 to 8. The optical film with a pressure-sensitive adhesive layer according to claim 2, wherein m in the formula (II) is 6. The optical film with a pressure-sensitive adhesive layer according to claim 1, wherein the silane compound (B) is 1,6-bis (trimethoxysilyl) hexane. The optical film with a pressure-sensitive adhesive layer according to claim 1, wherein the cation of the ionic compound (C) is a cation having a nitrogen atom-containing heterocyclic structure containing an unsaturated bond. The positive resist composition according to claim 1, wherein the cation of the ionic compound (C)

(Wherein 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, an aryl group which may have a substituent, A hydroxyl group, an ether group, a carboxyl group, a carbonyl group, or a halogen atom, and adjacent substituents may form a ring).
Wherein the optical film is a pyridinium cation represented by the following formula (1). The optical film with a pressure-sensitive adhesive layer according to claim 1, wherein the content of the silane compound (B) in the pressure-sensitive adhesive composition is 0.01 to 10 parts by weight based on 100 parts by weight of the (meth) acrylic resin (A). The optical film with a pressure-sensitive adhesive layer according to claim 1, wherein the (meth) acrylic resin (A) contains a structural unit derived from a monomer having a hydroxyl group. The composition according to claim 1, wherein the (meth) acrylic resin (A) comprises a structural unit derived from an alkyl acrylate (a1) having a glass transition temperature of the homopolymer of less than 0 占 폚, And a constituent unit derived from a compound represented by the formula (a2). The optical film with a pressure-sensitive adhesive layer according to claim 1, wherein the (meth) acrylic resin (A) has a weight average molecular weight of 500,000 to 250,000. The optical film with a pressure-sensitive adhesive layer according to claim 1, wherein the pressure-sensitive adhesive composition further comprises an isocyanate-based crosslinking agent (D). The optical film with a pressure-sensitive adhesive layer according to claim 1, wherein the pressure-sensitive adhesive composition does not substantially contain a triazole-based compound. A liquid crystal display device comprising the optical film with a pressure-sensitive adhesive layer according to any one of claims 1 to 14. (Meth) acrylic resin (A), a silane compound (B) and an ionic compound (C)
The silane compound (B) is represented by the following formula (I):

(Wherein A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the alkanediyl group and -CH ₂ - constituting the alicyclic hydrocarbon group are -O- or - R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a substituted or unsubstituted alkyl group having 1 to ⁵ carbon atoms An alkoxy group having 1 to 5 carbon atoms.
Is a silane compound represented by the formula
The anion of the ionic compound (C)

, &Lt; / RTI &gt;
A pressure-sensitive adhesive composition used for forming a pressure-sensitive adhesive layer to be laminated on a metal layer. An optical film with a pressure-sensitive adhesive layer comprising an optical film and a pressure-sensitive adhesive layer laminated on at least one side of the optical film, the pressure-sensitive adhesive layer being laminated on the metal layer through the pressure-
The pressure-
(Meth) acrylic resin (A), a silane compound (B) and an ionic compound (C)
The silane compound (B) is represented by the following formula (I):

(Wherein A represents an alkanediyl group having 1 to 20 carbon atoms or a divalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and the alkanediyl group and -CH ₂ - constituting the alicyclic hydrocarbon group are -O- or - R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ are each independently an alkyl group having 1 to 5 carbon atoms or a substituted or unsubstituted alkyl group having 1 to ⁵ carbon atoms An alkoxy group having 1 to 5 carbon atoms.
Is a silane compound represented by the formula
The anion of the ionic compound (C)

Wherein the anion is an anion selected from the group consisting of an anion selected from the group consisting of an anion and an anion. An optical laminate comprising the optical film with a pressure-sensitive adhesive layer according to any one of claims 1 to 14 and a metal layer laminated on the pressure-sensitive adhesive layer side of the optical film with the pressure-sensitive adhesive layer.

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