TW201631096A - Optical pressure-sensitive adhesive sheet - Google Patents

Abstract

An optical pressure-sensitive adhesive sheet for silver nanowire layer use includes a pressure-sensitive adhesive layer. The amount of acrylic acid ions extracted from the pressure-sensitive adhesive layer with pure water at 100 DEG C for 45 minutes is equal to or less than 5 [mu]g per gram of the pressure-sensitive adhesive layer, where the amount is measured by ion chromatography. The pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer.

Description

Optical adhesive sheet

The present invention relates to an optical adhesive sheet. More specifically, it relates to an optical adhesive sheet for a silver nanowire layer.

In recent years, display devices such as liquid crystal displays (LCDs) or input devices such as touch panels used in combination with such display devices have been widely used in various fields. In such display devices, input devices, and the like, an adhesive sheet having an adhesive layer is used for the purpose of bonding the optical members. For example, a transparent adhesive sheet is used for bonding a touch panel to various display members or optical members (see, for example, Patent Documents 1 to 3).

The optical member used in the above display device or input device or the like may cause deterioration due to ultraviolet rays. Therefore, the above-mentioned adhesive sheet is required to have ultraviolet absorbing properties (ultraviolet ray blocking property and UV blocking property). As such an adhesive sheet, a transparent adhesive sheet containing an ultraviolet absorber in an adhesive layer has been proposed (see Patent Document 4).

In particular, in the production of a capacitive touch panel, the adhesive sheet is directly attached to a metal film such as an ITO (Indium Tin Oxide) film or a metal oxide film (hereinafter, sometimes a metal is used). The film and metal oxide film are collectively referred to as "metal film" and used. In this application, the adhesive sheet is required to not corrode the so-called corrosion resistance of the above metal film.

However, when an adhesive sheet containing an acrylic polymer or the like comprising a monomer having a carboxyl group as a monomer component is used as the above-mentioned adhesive sheet to be attached to a metal thin film, if it is humidified When it is stored, the resistance value of the metal film changes, That is, the problem of corroding the metal film.

On the other hand, an adhesive sheet is known which has at least one adhesive layer formed of an adhesive composition containing acrylic acid and all the monomer components constituting the acrylic polymer. An acrylic polymer having a total content of methacrylic acid of 10% by weight or less; and the content of the acrylate ion and the methacrylate ion extracted from the adhesive sheet is 20 ng/cm ² per unit area of the adhesive layer. Hereinafter (refer to Patent Document 5). The adhesive sheet contains an acrylic polymer containing acrylic acid or methacrylic acid as a monomer component, and is excellent in corrosion resistance to a metal thin film such as an ITO film.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-238915

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2003-342542

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2004-231723

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2013-75978

[Patent Document 5] Japanese Patent Laid-Open Publication No. 2010-195942

In recent years, in applications such as the manufacture of a capacitive touch panel, a film having a silver nanowire layer (AgNW layer) instead of an ITO film has been gradually used as a metal thin film. The adhesive sheet in which the content of the acrylate ion and the methacrylate ion extracted from the adhesive sheet is 20 ng/cm ² or less per unit area of the adhesive layer as described above is excellent in corrosion resistance to the ITO film, but The corrosion resistance of the silver nanowire layer is insufficient. That is, the adhesive sheet to be applied to the optical member having the silver nanowire layer is required to have corrosion resistance higher than that of the ITO film. It is presumed that the reason is that the silver nanowire layer is liable to ionize silver due to the acrylic acid ions in the adhesive layer. Moreover, the silver nanowire layer is particularly susceptible to corrosion by irradiation of ultraviolet rays. Therefore, there is a need for an adhesive sheet which is excellent in corrosion resistance of a silver nanowire layer (especially, corrosion resistance (sometimes referred to as "UV resistance") in an environment where ultraviolet rays are irradiated.

Accordingly, an object of the present invention is to provide an optical adhesive sheet excellent in corrosion resistance (especially, UV resistance) of a silver nanowire layer.

The present inventors have conducted intensive studies to achieve the above object, and as a result, it has been found that an optical adhesive sheet for a silver nanowire layer having an adhesive layer has a small amount of acrylic ions extracted from the adhesive layer. The present invention can be completed by obtaining an adhesive sheet excellent in corrosion resistance to a silver nanowire layer.

That is, the present invention provides an optical adhesive sheet for a silver nanowire layer, which is characterized in that it is an adhesive sheet having an adhesive layer and is measured by ion chromatography at 100 ° C for 45 minutes using pure water. The amount of the acrylate ion extracted from the above adhesive layer is 5 μg/g or less per 1 g of the above adhesive layer.

The pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer containing an acrylic polymer.

The above adhesive layer preferably contains an ultraviolet absorber.

The absorbance A of the ultraviolet absorber obtained in the following manner is preferably 0.5 or less. Absorbance A: Absorbance measured by irradiating a light having a wavelength of 400 nm to a 0.08% toluene solution of the above ultraviolet absorber

The ultraviolet absorber is preferably selected from the group consisting of a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and a hydroxyphenyl group. It is at least one ultraviolet absorber selected from the group consisting of ultraviolet absorbers.

The pressure-sensitive adhesive layer preferably contains 0.01 to 10 parts by weight of the ultraviolet absorber with respect to 100 parts by weight of the base polymer in the pressure-sensitive adhesive layer.

The above optical adhesive sheet is preferably an optical adhesive sheet for a film sensor.

The optical adhesive sheet of the present invention is excellent in corrosion resistance to a silver nanowire layer. Further, the corrosion resistance in an environment where ultraviolet rays are irradiated is particularly excellent. Therefore, it can be preferably used for application to an optical member having a silver nanowire layer, in particular, a transparent conductive film in which a silver nanowire layer such as a silver nanowire film is formed.

1‧‧‧Optical products

11‧‧‧ Cover

12‧‧‧Optical adhesive sheet of the invention

13‧‧‧Substrate

14‧‧‧ Silver Nanolayer

15‧‧‧Protective layer

30‧‧‧ test strips

31‧‧‧Transparent conductive film (1)

32‧‧‧Transparent substrate

33‧‧‧ Silver Nanolayer

34‧‧‧Protective layer

35‧‧‧Double-sided adhesive sheet

36‧‧‧ glass plate

Fig. 1 is a schematic cross-sectional view showing an example of an optical product using the optical adhesive sheet of the present invention.

Fig. 2 is a schematic cross-sectional view showing another example of an optical product using the optical adhesive sheet of the present invention.

Fig. 3 is a schematic view (top surface plan view) of the test piece used for evaluation of the UV resistance of the double-sided adhesive sheet produced in the examples and the comparative examples.

4 is a schematic view showing a test piece used in the evaluation of the UV resistance of the double-sided adhesive sheet produced in the examples and the comparative examples (a cross-sectional view taken along line A-A' of FIG. 3).

The optical adhesive sheet for a silver nanowire layer of the present invention has at least an adhesive layer which is an acrylic acid ion extracted by pure water at 100 ° C for 45 minutes as measured by ion chromatography. The amount is 5 μg/g or less per 1 g of the adhesive layer. In the present specification, the above-mentioned adhesive layer may be referred to as "the adhesive layer of the present invention". In the present specification, the "adhesive sheet for optical nanowire layer of the present invention" is simply referred to as "the optical adhesive sheet of the present invention". Also, the "adhesive sheet" contains the meaning of "adhesive tape". That is, the optical adhesive sheet of the present invention may be an adhesive tape having a belt-like form.

The optical adhesive sheet of the present invention is adhered to the side of the silver nanowire layer (for example, an optical member having the side of the silver nanowire layer in the optical product), and the adhesive surface is adhered by the adhesive layer of the present invention. The surface (the surface of the adhesive layer) is not particularly limited in its form. For example, it can be a single-sided adhesive sheet with only one side being an adhesive surface, or a double-sided adhesive surface with a double-sided adhesive surface. sheet. Moreover, in the case where the optical adhesive sheet of the present invention is a double-sided adhesive sheet, the optical adhesive sheet of the present invention may have the form of providing two adhesive faces with the adhesive layer of the present invention, and may have the adhesive of the present invention. The agent layer provides an adhesive surface to provide another adhesive surface in the form of an adhesive layer (other adhesive layer) other than the adhesive layer of the present invention. Further, from the viewpoint of adhering the adherends to each other, a double-sided adhesive sheet is preferable.

The optical adhesive sheet of the present invention may be a so-called "substrate-free" adhesive sheet having no base material (base material layer), or may be an adhesive sheet having a base material type. In addition, in this specification, the "substrate-free type" adhesive sheet may be referred to as "substrate-free adhesive sheet", and an adhesive sheet having a substrate type may be referred to as "adhesive sheet with a base material". "." Examples of the substrate-free adhesive sheet include a double-sided adhesive sheet containing only the adhesive layer of the present invention or an adhesive layer and other adhesive layer of the present invention (adhesive other than the adhesive layer of the present invention). Double layer adhesive sheet of the agent layer). Moreover, as the adhesive sheet with the base material, for example, a single-sided adhesive sheet having the adhesive layer of the present invention on one side of the substrate or an adhesive layer of the present invention on both sides of the substrate may be mentioned. A double-sided adhesive sheet or a double-sided adhesive sheet having the adhesive layer of the present invention on one side of the substrate and another adhesive layer on the other side. In addition, the above-mentioned "substrate (base material layer)" is a support, and when the optical adhesive sheet of the present invention is used (attached) to an adherend, it is attached to the adhesive layer together with the adhesive layer. The body part. The separator (release liner) which is peeled off when the adhesive sheet is used (attached) is not included in the above substrate.

(Adhesive layer of the present invention)

In the adhesive layer of the present invention, the amount of acrylic acid ions extracted from the adhesive layer by pure ion water at 100 ° C for 45 minutes as measured by ion chromatography (sometimes referred to as "extracted acrylic acid ion amount" ” is 5 μg/g or less (for example, 0 to 5 μg/g), preferably 4.5 μg/g or less (for example, 0 to 4.5 μg/g), more preferably 4 μg/g or less in 1 g of the adhesive layer (for example). 0 to 4 μg/g), more preferably 3.2 μg/g or less (for example, 0 to 3.2 μg/g), still more preferably 3 μg/g or less (for example, 0 to 3 μg/g), and most preferably 2.5 μg/g or less. (eg 0~2.5μg/g). on The amount of extracted acrylate ions indicates the ease of liberation of the acrylate ions from the adhesive layer in the moisture when the adhesive sheet is placed in a humidified environment or the like. When the amount of the extracted acrylic acid ions exceeds 5 μg/g, the adhesive sheet is attached to the optical member on the side where the silver nanowire layer is present on the optical member layer of the present invention, and under humidification conditions. When it is stored in the presence of moisture, the silver nanowire layer is corroded by the influence of the acrylate ion which is free from the adhesive layer, and the electric resistance value is increased, and the electrical conductivity is liable to lower.

The above "extraction of the amount of acrylic acid ions" can be measured by the following method.

First, the adhesive layer is cut into an appropriate size, and a PET film (thickness: 25 to 50 μm) is attached to one of the adhesive faces of the adhesive layer, and only one of the adhesive faces exposed on one side is set as a test piece. In the case where the optical adhesive sheet of the present invention is a single-sided adhesive sheet with a base material, the state in which the release liner is peeled off may be used as a test piece. Further, in the case where the optical adhesive sheet of the present invention is a substrateless double-sided adhesive sheet comprising a single adhesive layer, a state in which a release liner is provided on one surface of the adhesive layer may be used as the test piece. . The exposed area of the adhesive face of the test piece is preferably 100 cm ² .

Then, the test piece was placed in pure water at a temperature of 100 ° C, boiled for 45 minutes, and subjected to boiling extraction of acrylic acid ions.

Next, the amount of the acrylate ion (unit: μg) in the extract obtained above was measured by ion chromatography (Ion Chromatography) to calculate the acrylate ion per 1 g of the adhesive layer in the test piece. The amount (unit: μg / g). The measurement conditions of the ion chromatography (Ion Chromatography) are not particularly limited, and for example, measurement can be carried out under the following conditions.

[Measurement conditions of ion chromatography]

Analytical device: manufactured by Thermo Fisher Scientific, ICS-3000

Separation column: Ion Pac AS18 (4mm × 250mm)

Protection column: Ion Pac AG18 (4mm × 50mm)

Removal system: AERS-500 (External Mode)

Detector: Conductivity detector

Dissolved solution: aqueous KOH solution

(Using the eluent generator EGIII)

Dissolution flow: 1.0ml/min

Sample injection amount: 250μl

The adhesive constituting the adhesive layer of the present invention is not particularly limited, and examples thereof include an acrylic adhesive, a rubber adhesive, a vinyl alkane adhesive, a polyoxygen adhesive, and a polyester adhesive. Agent, polyamine-based adhesive, urethane-based adhesive, fluorine-based adhesive, epoxy-based adhesive, and the like. Among them, as the adhesive constituting the adhesive layer, an acrylic adhesive is preferable in terms of transparency, adhesiveness, weather resistance, cost, and ease of design of the adhesive. That is, the pressure-sensitive adhesive layer of the present invention is preferably an acrylic pressure-sensitive adhesive layer composed of an acrylic pressure-sensitive adhesive. These adhesives can be used alone or in combination of two or more.

The acrylic pressure-sensitive adhesive layer contains an acrylic polymer as a base polymer. The acrylic polymer is a polymer containing an acrylic monomer (a monomer having a (meth) acrylonitrile group in a molecule) as a monomer component constituting the polymer. The acrylic polymer is preferably a polymer containing an alkyl (meth)acrylate as a monomer component constituting the polymer. Further, the acrylic polymers may be used singly or in combination of two or more.

The adhesive composition forming the adhesive layer of the present invention may be in any form. For example, the adhesive composition may be an emulsion type, a solvent type (solution type), an active energy ray hardening type, a hot melt type (hot melt type), or the like. Among them, a solvent-based or active energy ray-curable adhesive composition is preferred in terms of productivity and an adhesive layer which is excellent in optical properties or appearance. In particular, from the viewpoint of further reducing the amount of the acrylate ion in the adhesive layer, a solvent-based adhesive composition is preferred.

That is, the adhesive layer of the present invention preferably contains an acrylic polymer as a base polymer. The acrylic pressure-sensitive adhesive layer of the composition is formed by a solvent-type acrylic pressure-sensitive adhesive composition.

Examples of the active energy ray include free radiation such as α rays, β rays, γ rays, neutron rays, and electron beams, or ultraviolet rays, and particularly preferably ultraviolet rays. That is, the active energy ray-curable adhesive composition is preferably an ultraviolet curable adhesive composition.

Examples of the adhesive composition (acrylic adhesive composition) for forming the acrylic pressure-sensitive adhesive layer include an acrylic pressure-sensitive adhesive composition containing an acrylic polymer as an essential component or a monomer constituting the acrylic polymer. A mixture of (monomer) (sometimes referred to as "monomer mixture"), or an acrylic adhesive composition containing a part of the polymer as an essential component. The former is, for example, a solvent-based acrylic pressure-sensitive adhesive composition. Moreover, as the latter, for example, an active energy ray-curable acrylic pressure-sensitive adhesive composition or the like can be mentioned. The above "monomer mixture" means a mixture containing a monomer component constituting a polymer. In addition, the "partial polymer" may be referred to as a "prepolymer", and means a composition in which one or two or more monomer components of the monomer components in the monomer mixture are partially polymerized.

The acrylic polymer is a polymer which is formed (formed) by using an acrylic monomer as an essential monomer component. The acrylic polymer is preferably a polymer which is formed (formed) by using an alkyl (meth)acrylate as an essential monomer component. That is, it is preferable that the acrylic polymer contains a (meth)acrylic acid alkyl ester as a structural unit. In the present specification, the term "(meth)acrylic acid" means "acrylic acid" and/or "methacrylic acid" (one or both of "acrylic acid" and "methacrylic acid"), and the others are also the same. Further, the acrylic polymer is composed of one or two or more monomer components.

The above (meth)acrylic acid alkyl ester which is an essential monomer component is preferably an alkyl (meth)acrylate having a linear or branched alkyl group. Further, the alkyl (meth)acrylate may be used singly or in combination of two or more.

The alkyl (meth)acrylate having a linear or branched alkyl group is not particularly limited, and examples thereof include methyl (meth)acrylate, ethyl (meth)acrylate, and (meth)acrylic acid. Propyl ester, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, second butyl (meth)acrylate, tert-butyl (meth)acrylate, Amyl (meth)acrylate, isoamyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethyl (meth)acrylate Hexyl ester, isooctyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, (methyl) Undecyl acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, pentadecyl (meth) acrylate , cetyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate (stearyl (meth) acrylate), (meth) acrylate Fatty ester, (meth)acrylic acid Alkyl ester, (meth) acrylate, eicosyl acrylate and the like having a carbon number of 1 to 20 linear or branched alkyl group of the (meth) acrylate. Wherein the alkyl (meth)acrylate having a linear or branched alkyl group is preferably an alkyl (meth)acrylate having a linear or branched alkyl group having 4 to 18 carbon atoms. More preferred is 2-ethylhexyl acrylate (2EHA), isostearyl acrylate (ISTA). Further, the alkyl (meth)acrylate having a linear or branched alkyl group may be used singly or in combination of two or more.

The ratio of the (meth)acrylic acid alkyl ester in all the monomer components (100% by weight) constituting the acrylic polymer is not particularly limited, but is preferably 50% by weight or more (for example, 50 to 100% by weight). More preferably, it is 53 to 90% by weight, and further preferably 55 to 85% by weight.

The acrylic polymer may contain a copolymerizable monomer as a monomer component constituting the polymer together with the alkyl (meth)acrylate. That is, the acrylic polymer may contain a copolymerizable monomer as a structural unit. Further, the copolymerizable monomers may be used singly or in combination of two or more.

The copolymerizable monomer is not particularly limited, and it is effective in suppressing white clouding in a high-humidity environment and improving durability, and is reliable for the silver nanowire layer or the protective layer described below. The compatibility with various additives such as an ultraviolet absorber and transparency can be preferably applied to a monomer having a nitrogen atom in the molecule and a monomer having a hydroxyl group in the molecule. That is, the acrylic polymer preferably contains a monomer having a nitrogen atom in the molecule as a structural unit. Further, the acrylic polymer preferably contains a monomer having a hydroxyl group in the molecule as a structural unit.

The above-mentioned single system having a nitrogen atom in the molecule has a monomer (monomer) having at least one nitrogen atom in the molecule (within one molecule). In the present specification, the above-mentioned "monomer having a nitrogen atom in a molecule" may be referred to as "a monomer containing a nitrogen atom". The monomer containing the nitrogen atom is not particularly limited, and examples thereof include a cyclic nitrogen-containing monomer and a (meth) acrylamide. Further, the monomers containing a nitrogen atom may be used singly or in combination of two or more.

The cyclic nitrogen-containing monomer is not particularly limited as long as it has a polymerizable functional group containing an unsaturated double bond such as a (meth)acryl fluorenyl group or a vinyl group and has a cyclic nitrogen structure. The above cyclic nitrogen structure is preferably one having a nitrogen atom in the cyclic structure.

Examples of the cyclic nitrogen-containing monomer include N-vinyl cyclic decylamine (neutylamine-based vinyl monomer), and a vinyl-based monomer having a nitrogen-containing hetero ring.

The N-vinyl cyclic decylamine represented by the following formula (1) is exemplified as the N-vinyl cyclic guanamine.

(In the formula (1), R ¹ represents a divalent organic group)

R ¹ in the above formula (1) is a divalent organic group, preferably a divalent saturated hydrocarbon group or an unsaturated hydrocarbon group, more preferably a divalent saturated hydrocarbon group (for example, an alkylene group having 3 to 5 carbon atoms).

Examples of the N-vinyl cyclic guanamine represented by the above formula (1) include N-vinyl-2-pyrrolidone, N-vinyl-2-piperidone, and N-vinyl-3. - Linoleone, N-vinyl-2-caprolactam, N-vinyl-1,3- 2-ketone, N-vinyl-3,5- Dioxadione and the like.

Examples of the vinyl monomer having a nitrogen-containing hetero ring include, for example, Chloride ring, piperidine ring, pyrrolidine ring, piperazine An acrylic monomer having a nitrogen-containing hetero ring or the like.

The vinyl monomer having a nitrogen-containing hetero ring is not particularly limited, and examples thereof include (meth)acryl fluorenyl group. Porphyrin, N-vinyl pipe , N-vinylpyrrole, N-vinylimidazole, N-vinylpyrrol N-vinyl Porphyrin, N-vinylpyrazole, vinyl pyridine, vinyl pyrimidine, vinyl Azole or vinyl Azole, vinylthiazole, vinylisothiazole, vinyl anthracene And (meth) acrylonitrile pyrrolidone, (meth) propylene decyl pyrrolidine, (meth) acryl hydrazino piperidine, and the like.

The vinyl monomer having a nitrogen-containing hetero ring is preferably an acrylic monomer having a nitrogen-containing hetero ring, more preferably a (meth)acryl fluorenyl group. Porphyrin, (meth) propylene decyl pyrrolidine, (meth) acrylonitrile piperidine.

Examples of the (meth) acrylamide include (meth) acrylamide, N-alkyl (meth) acrylamide, N, N-dialkyl (meth) acrylamide, and the like. . Examples of the N-alkyl (meth) acrylamide include N-ethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, and N-n-butyl (A). Base) acrylamide, N-octyl (meth) acrylamide, and the like. Further, in the above N-alkyl (meth) acrylamide, for example, dimethylaminoethyl (meth) acrylamide, diethylaminoethyl (meth) acrylamide, A (meth) acrylamide having an amine group of dimethylaminopropyl (meth) acrylamide. Examples of the above N,N-dialkyl(meth)acrylamide include N,N-dimethyl(meth)acrylamide and N,N-diethyl(meth)acrylamide. , N,N-dipropyl(meth)acrylamide, N,N-diisopropyl(meth)acrylamide, N,N-di(n-butyl)(meth)acrylamide, N,N-di(t-butyl)(meth)acrylamide or the like.

Further, among the above (meth) acrylamides, for example, various N-hydroxyalkyl (meth) acrylamides are also included. Examples of the N-hydroxyalkyl (meth) acrylamide include N-methylol (meth) acrylamide, N-(2-hydroxyethyl) (meth) acrylamide, and N. -(2-hydroxypropane (meth)acrylamide, N-(1-hydroxypropyl)(meth)acrylamide, N-(3-hydroxypropyl)(methyl)propenamide, N-(2-hydroxyl Butyl) (meth) acrylamide, N-(3-hydroxybutyl)(meth) acrylamide, N-(4-hydroxybutyl)(meth) decylamine, N-methyl- N-2-hydroxyethyl (meth) acrylamide and the like.

Further, among the above (meth) acrylamides, for example, various N-alkoxyalkyl (meth) acrylamides are also included. Examples of the above N-alkoxyalkyl (meth) acrylamide include N-methoxymethyl (meth) acrylamide and N-butoxymethyl (meth) acrylamide. Wait.

In addition, examples of the monomer containing a nitrogen atom other than the above-mentioned cyclic nitrogen-containing monomer and the above (meth)acrylamide may include an amine group-containing monomer, a cyano group-containing monomer, and a ruthenium-containing group. Imino group monomer, isocyanate group-containing monomer, and the like. Examples of the amino group-containing monomer include aminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, and dimethylaminopropyl (meth)acrylate. Tert-butylaminoethyl methacrylate or the like. Examples of the cyano group-containing monomer include acrylonitrile and methacrylonitrile. Examples of the above-mentioned quinone imine group-containing monomer include a maleimide-based monomer (for example, N-cyclohexylmaleimide, N-isopropylmaleimide, N-lauryl horse).醯iimine, N-phenylmaleimide, etc.), itaconimide monomer (eg N-methyl ketimine, N-ethyl ketimine, N-butyl Base coat, carbamide, N-octyl ketimine, N-2-ethylhexyl ketimine, N-Lauryl ketimine, N-cyclohexyl ketimine, etc. Amber quinone imine monomer (eg N-(methyl) propylene oxymethylene succinimide, N-(methyl) propylene fluorenyl-6-oxyhexamethylene amber Amine, N-(meth)acryloyl-8-oxyoctamethylene succinimide, etc.). Examples of the isocyanate group-containing monomer include 2-(meth)acryloxyethyl isocyanate.

Among them, the monomer containing a nitrogen atom is preferably a cyclic nitrogen-containing monomer, more preferably an N-vinyl cyclic decylamine. More specifically, it is especially preferably N-vinyl-2-pyrrolidone (NVP).

In the case where the acrylic polymer contains the monomer having a nitrogen atom as a monomer component constituting the polymer, the nitrogen atom-containing monomer in all the monomer components (100% by weight) of the acrylic polymer is formed. The ratio of the body is not particularly limited, but is preferably 1% by weight or more, more preferably 3% by weight or more, and still more preferably 5% by weight or more. When the ratio is 1% by weight or more, the ratio of the monomer having a hydroxyl group in the molecule can be reduced, so that the amount of the acrylate ion derived from the monomer having a hydroxyl group in the molecule tends to be further reduced. . Further, since the suppression of white turbidity and the durability in a high-humidity environment are further improved, it is possible to obtain higher adhesion reliability to the silver nanowire layer or the protective layer described below, which is preferable. In addition, the upper limit of the ratio of the above-mentioned nitrogen atom-containing monomer is preferably 30% by weight or less in terms of obtaining an adhesive layer having an appropriate flexibility and obtaining an adhesive layer having excellent transparency. It is more preferably 25% by weight or less, still more preferably 20% by weight or less.

The monomer having a hydroxyl group in the molecule has at least one hydroxyl group in a molecule (within one molecule), and preferably has an unsaturated group such as a (meth)acryl fluorenyl group or a vinyl group. A polymerizable functional group of a double bond and having a hydroxyl group. Among them, the monomer having a hydroxyl group in the molecule does not contain the monomer having a nitrogen atom. In other words, in the above-mentioned "monomer containing a nitrogen atom", a monomer having a nitrogen atom and a hydroxyl group in the molecule is contained. In the present specification, the above-mentioned "monomer having a hydroxyl group in a molecule" may be referred to as a "hydroxyl group-containing monomer". Further, the hydroxyl group-containing monomers may be used singly or in combination of two or more.

Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and (meth)acrylic acid. 4-hydroxybutyl ester, 6-hydroxyhexyl (meth)acrylate, hydroxyoctyl (meth)acrylate, hydroxydecyl (meth)acrylate, hydroxylauryl (meth)acrylate, (meth)acrylic acid ( Hydroxy-containing (meth) acrylate such as 4-hydroxymethylcyclohexyl) ester; vinyl alcohol; allyl alcohol and the like.

Among them, the hydroxyl group-containing monomer is preferably a hydroxyl group-containing (meth) acrylate, more preferably 2-hydroxyethyl acrylate (HEA) or 4-hydroxybutyl acrylate (4HBA).

When the acrylic polymer contains the hydroxyl group-containing monomer as a monomer component constituting the polymer, the hydroxyl group-containing monomer in the entire monomer component (100% by weight) of the acrylic polymer is formed. The ratio is not particularly limited, and is preferably 0.5 weight in terms of suppression of white clouding in a high-humidity environment and improvement in durability, and obtaining higher subsequent reliability for a silver nanowire layer or a protective layer described below. More preferably, it is 0.8% by weight or more, and further preferably 1% by weight or more. Further, the upper limit of the ratio of the hydroxyl group-containing monomer is preferably 30% by weight or less, more preferably 25% by weight or less, still more preferably 15% by weight or less. When the ratio is 30% by weight or less (especially 25% by weight or less), there is a tendency that the amount of the acrylate ion derived from the hydroxyl group-containing monomer can be further reduced, which is preferable. Further, it is presumed that the acrylate ion derived from the hydroxyl group-containing monomer is inevitably mixed when a monomer having a hydroxyl group is used as a monomer component constituting the polymer. It is presumed that the reason is that acrylic acid ions are mixed in the process of producing a hydroxyl group-containing monomer, and acrylic acid ions are present as a impurity in a commercial product. Further, in the case where the adhesive layer of the present invention is formed by the active energy ray-curable adhesive composition, the above-mentioned hydroxyl group-containing single in all the monomer components (100% by weight) constituting the acrylic polymer The upper limit of the ratio of the body is preferably 10% by weight or less, and more preferably 5% by weight or less from the viewpoint of further reducing the amount of the acrylic acid ion in the adhesive layer.

The total ratio of the nitrogen atom-containing monomer and the hydroxyl group-containing monomer in all the monomer components (100% by weight) constituting the acrylic polymer is not particularly limited, and it is white turbid in a high-humidity environment. The suppression and durability are improved, and it is preferably 5% by weight or more, more preferably 10% by weight or more, more preferably 10% by weight or more, more preferably 10 parts by weight or more, more preferably in terms of higher reliability of the silver nanowire layer or the protective layer described below. 15% by weight or more. In addition, the upper limit of the total ratio is preferably 50% by weight or less, more preferably 40%, in terms of obtaining an adhesive layer having a moderate flexibility and obtaining an adhesive layer having excellent transparency. % or less, further preferably 35% by weight or less.

a copolymerizable monomer other than a monomer containing a nitrogen atom and a monomer having a hydroxyl group, Further, a monomer having an alicyclic structure can be cited. The monomer having an alicyclic structure is not particularly limited as long as it has a polymerizable functional group containing an unsaturated double bond such as a (meth) acrylonitrile group or a vinyl group and has an alicyclic structure. For example, the above-mentioned monomer having an alicyclic structure contains an alkyl (meth)acrylate having a cycloalkyl group. Further, the monomers having an alicyclic structure may be used singly or in combination of two or more.

The alicyclic structure of the monomer having an alicyclic structure is a cyclic hydrocarbon structure, preferably having a carbon number of 5 or more, more preferably 6 to 24 carbon atoms, still more preferably 6 to 15 carbon atoms, and particularly preferably carbon. Number 6~10.

Examples of the monomer having an alicyclic structure include cyclopropyl (meth)acrylate, cyclobutyl (meth)acrylate, cyclopentyl (meth)acrylate, and cyclohexyl (meth)acrylate. Cycloheptyl (meth) acrylate, cyclooctyl (meth) acrylate, (meth) acrylate Ethyl ester, dicyclopentanyl (meth)acrylate, HPMPA represented by the following formula (2), TMA-2 represented by the following formula (3), HCPA represented by the following formula (4), etc. (methyl ) acrylic monomer. Further, in the following formula (4), the bonding position of the cyclohexyl ring which is connected by a line and the structural formula in the parentheses is not particularly limited. Among these, (meth)acrylic acid is preferred ester.

[Chemical 3]

When the acrylic polymer contains the monomer having the alicyclic structure as a monomer component constituting the polymer, the alicyclic structure is included in all the monomer components (100% by weight) of the acrylic polymer. The ratio of the monomer is not particularly limited, and is preferably 10% by weight or more in terms of durability improvement and higher subsequent reliability with respect to the silver nanowire layer or the protective layer described below. Further, the upper limit of the ratio of the monomer having the alicyclic structure is preferably 50% by weight or less, more preferably 40% by weight or less, and more preferably from the viewpoint of obtaining an adhesive layer having a moderate flexibility. Preferably it is 30% by weight or less.

Further, examples of the copolymerizable monomer include polyfunctional monomers. Examples of the polyfunctional monomer include hexanediol di(meth)acrylate, butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, and (poly) Propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, Trimethylolpropane tri(meth)acrylate, tetramethylol methane tri(meth)acrylate, allyl (meth)acrylate, vinyl (meth)acrylate, divinylbenzene, acrylic ring Oxylate, polyester acrylate, urethane acrylate, and the like. Further, the polyfunctional monomers may be used singly or in combination of two or more.

When the acrylic polymer contains the polyfunctional monomer as a monomer component constituting the polymer, the polyfunctional monomer in the entire monomer component (100% by weight) of the acrylic polymer is formed. The ratio is not particularly limited, but is preferably 0.5% by weight or less (for example, more than 0% by weight and 0.5% by weight or less), more preferably 0.2% by weight or less (for example, more than 0% by weight and 0.2% by weight or less).

Further, examples of the copolymerizable monomer include alkoxyalkyl (meth)acrylate. The alkoxyalkyl (meth)acrylate is not particularly limited, and examples thereof include 2-methoxyethyl (meth)acrylate and 2-ethoxyethyl (meth)acrylate. Oxygen triethylene glycol (meth) acrylate, 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 4-methoxy butyl (meth) acrylate Ester, 4-ethoxybutyl (meth)acrylate, and the like. Among them, the above alkoxyalkyl (meth)acrylate is preferably an alkoxyalkyl acrylate, more preferably 2-methoxyethyl acrylate (MEA). Further, the alkoxyalkyl (meth)acrylate may be used singly or in combination of two or more.

When the acrylic polymer comprises the above-mentioned (meth)acrylic acid alkoxyalkyl ester as a monomer component constituting the polymer, the alkyl (meth)acrylate and the above (meth)acrylic alkoxy group The ratio of the alkyl ester is not particularly limited, and is preferably more than 100:0 and 25:75 or less, more preferably more than 100:0 and 50:50 or less, in terms of [the former: the latter] (weight ratio).

In addition, examples of the copolymerizable monomer include a carboxyl group-containing monomer, an epoxy group-containing monomer, a sulfonic acid group-containing monomer, a phosphate group-containing monomer, and an aromatic hydrocarbon group. (Meth) acrylate, vinyl ester, aromatic vinyl compound, olefin or diene, vinyl ether, vinyl chloride, and the like. Examples of the carboxyl group-containing monomer include (meth)acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, and methacrylic acid, and the carboxyl group-containing monomer, for example. Also included are monomers containing an acid anhydride group such as maleic anhydride or itaconic anhydride. Examples of the epoxy group-containing monomer include glycidyl (meth)acrylate and methyl glycidyl (meth)acrylate. As the above sulphur Examples of the acid group-containing monomer include sodium vinylsulfonate and the like. Examples of the (meth) acrylate having an aromatic hydrocarbon group include phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, and benzyl (meth) acrylate. Examples of the vinyl esters include vinyl acetate and vinyl propionate. Examples of the aromatic vinyl compound include styrene and vinyl toluene. Examples of the olefin or diene include ethylene, propylene, butadiene, isoprene, and isobutylene. Examples of the vinyl ethers include vinyl alkyl ethers and the like.

In view of obtaining the acrylic pressure-sensitive adhesive layer having excellent corrosion resistance to the silver nanowire layer, the acrylic polymer preferably contains no or substantially no monomer component as a constituent polymer. The monomer having an acidic group is preferably a monomer having no or substantially no carboxyl group. Examples of the acid group-containing monomer include a carboxyl group-containing monomer, a sulfonic acid group-containing monomer, and a phosphate group-containing monomer. Specifically, the ratio of the acid group-containing monomer in all the monomer components (100% by weight) constituting the acrylic polymer is 0.05% by weight or less (preferably 0.01% by weight or less). .

The acrylic polymer is not particularly limited, and is preferably a monomer component constituting the polymer, and includes a monomer having a high glass transition temperature (Tg) when a homopolymer is formed (hereinafter, sometimes referred to as "high Tg" monomer"). When a high Tg monomer is used as the monomer component, the adhesive containing the acrylic polymer becomes hard, and the reliability of the optical adhesive sheet of the present invention to the silver nanowire layer or the following protective layer at a high temperature is obtained. Further improvement is therefore preferred.

The glass transition temperature at which the homopolymer of the high Tg monomer is formed is not particularly limited, and is, for example, 20 ° C or higher, preferably 30 ° C or higher, and more preferably 90 ° C or higher. By the Tg of the above high Tg monomer being within the above range, the cohesive force of the adhesive layer is improved.

The high Tg monomer may be the above-exemplified monomer exemplified as the monomer constituting the monomer component of the acrylic polymer, or may be a monomer other than the above. In particular, the monomer component constituting the acrylic polymer is preferably formed as a monomer constituting the above acrylic polymer. A monomer exemplified and comprising a monomer component as a high Tg monomer. The high Tg monomer may be used alone or in combination of two or more.

The high Tg monomer is not particularly limited, and examples thereof include methyl methacrylate (Tg: 105 ° C), ethyl methacrylate (Tg: 65 ° C), and cyclohexyl methacrylate (Tg: 83). °C), acrylic acid Ester (Tg: 94 ° C), methacrylic acid Ester (Tg: 150 ° C), benzyl methacrylate (Tg: 54 ° C), glycidyl methacrylate (Tg: 46 ° C), stearyl methacrylate (Tg: 38 ° C), methacrylic acid 3 - Hydroxypropyl ester (Tg: 26 ° C), 2-hydroxyethyl methacrylate (Tg: 55 ° C), acrylic acid (Tg: 106 ° C), methacrylic acid (Tg: 227 ° C), and the like. Further, in addition to the above, for example, vinyl acetate (Tg: 32 ° C), acrylonitrile (Tg: 97 ° C), methacrylonitrile (Tg: 120 ° C), styrene (Tg: 80 ° C), 2-methylstyrene (Tg: 136 ° C), acrylamide (Tg: 165 ° C), N-vinyl-2-pyrrolidone (NVP) (Tg: 80 ° C), and the like. Among them, methyl methacrylate and acrylic acid are preferred. Ester, NVP.

When the acrylic polymer contains the high Tg monomer as a monomer component constituting the polymer, the ratio of the high Tg monomer in all the monomer components (100% by weight) of the acrylic polymer is It is not particularly limited, but is preferably 1 to 50% by weight, more preferably 5 to 40% by weight, still more preferably 10 to 30% by weight. When the ratio of the high Tg monomer is within the above range, the optical adhesive sheet of the present invention is further improved in adhesion reliability to the silver nanowire layer or the protective layer described below at a high temperature. In the case where two or more kinds of high Tg monomers are contained in the monomer component constituting the polymer, the ratio of the "high Tg monomer" is a total of the ratio of the two or more high Tg monomers.

In the above, the acrylic polymer is preferably 50 to 90% by weight (preferably 55) of an alkyl (meth)acrylate containing a linear or branched alkyl group having 4 to 18 carbon atoms. ~85% by weight), 10 to 50% by weight (preferably 15 to 40% by weight) of a monomer selected from the group consisting of a monomer containing a nitrogen atom and a monomer having a hydroxyl group, and carbon a monomer mixture of 0 to 40% by weight (preferably 0 to 30% by weight) of a monomer having 6 to 10 alicyclic structures The acrylic polymer composed of the material is more preferably 50 to 90% by weight (preferably 55 to 50% by weight of the alkyl (meth)acrylate having a linear or branched alkyl group having 4 to 18 carbon atoms. 85 wt%), 3 to 30% by weight of a monomer containing a nitrogen atom (preferably 5 to 25% by weight), 0.8 to 25% by weight (preferably 1 to 15% by weight) of a monomer having a hydroxyl group, and carbon The number of monomers having 6 to 10 alicyclic structures is 0 to 40% by weight (preferably 0 to 30% by weight), and the ratio of the monomer containing a nitrogen atom to the monomer having a hydroxyl group is 10 to 50% by weight. An acrylic polymer composed of a monomer mixture (preferably 15 to 40% by weight). Further, the above ratio (% by weight) is a ratio with respect to all the monomer components (100% by weight) constituting the acrylic polymer.

The content of the base polymer (especially the acrylic polymer) in the adhesive layer of the present invention is not particularly limited, and is preferably 50% by weight or more based on the total weight of the adhesive layer of the present invention, for example, 50% by weight or more (for example, 50 to 100% by weight), more preferably 80% by weight or more (for example, 80 to 100% by weight), still more preferably 90% by weight or more (for example, 90 to 100% by weight).

The base polymer such as the above acrylic polymer contained in the pressure-sensitive adhesive layer of the present invention is obtained by polymerizing a monomer component. The polymerization method is not particularly limited, and examples thereof include a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a polymerization method (active energy ray polymerization method) using active energy ray irradiation. Among them, in terms of transparency, cost, and the like of the adhesive layer, a solution polymerization method and an active energy ray polymerization method are preferred, and a solution is more preferable from the viewpoint of further reducing the amount of acrylic acid ions in the adhesive layer. Polymerization method.

Further, in the polymerization of the above monomer components, various usual solvents can also be used. Examples of the solvent include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; and cyclohexane and methylcyclohexane. An alicyclic hydrocarbon; an organic solvent such as a ketone such as methyl ethyl ketone or methyl isobutyl ketone. Further, the solvent may be used singly or in combination of two or more.

In the polymerization of the above monomer component, a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator (photoinitiator) may be used depending on the type of the polymerization reaction. Furthermore, the aggregation starts The starting agents may be used singly or in combination of two or more.

The thermal polymerization initiator is not particularly limited, and examples thereof include an azo polymerization initiator and a peroxide polymerization initiator (for example, benzamidine peroxide or maleic acid peroxide). Tributyl ester or the like), a redox polymerization initiator, and the like. Among these, an azo-based polymerization initiator disclosed in JP-A-2002-69411 is preferred. Examples of the azo polymerization initiator include 2,2'-azobisisobutyronitrile (hereinafter sometimes referred to as "AIBN") and 2,2'-azobis-2-methylbutylene. Nitrile (hereinafter sometimes referred to as "AMBN"), 2,2'-azobis(2-methylpropionic acid) dimethyl ester, 4,4'-azobis-4-cyanovaleric acid or the like. Further, the thermal polymerization initiators may be used singly or in combination of two or more.

In the case where the azo-based polymerization initiator is used in the polymerization of the acrylic polymer, the amount of the azo-based polymerization initiator to be used is not particularly limited, and is, for example, relative to all the monomers constituting the acrylic polymer. The body component is preferably 100 parts by weight or more, more preferably 0.1 part by weight or more, still more preferably 0.5 part by weight or less, still more preferably 0.3 part by weight or less.

The photopolymerization initiator is not particularly limited, and examples thereof include a benzoin ether photopolymerization initiator, an acetophenone photopolymerization initiator, an α-keto alcohol photopolymerization initiator, and an aromatic sulfonate.醯Chlorine photopolymerization initiator, photoactive oxime photopolymerization initiator, benzoin photopolymerization initiator, diphenylethanedione photopolymerization initiator, benzophenone photopolymerization initiator , ketal photopolymerization initiator, 9-oxosulfur A photopolymerization initiator or the like. In addition, a fluorenylphosphine oxide-based photopolymerization initiator and a titanocene-based photopolymerization initiator may be mentioned. Examples of the benzoin ether photopolymerization initiator include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and 2,2-dimethoxy-1,2-di. Phenylethane-1-one, anisole methyl ether, and the like. Examples of the acetophenone-based photopolymerization initiator include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, and 1-hydroxycyclohexyl. Phenyl ketone, 4-phenoxydichloroacetophenone, 4-(t-butyl)dichloroacetophenone, and the like. The α-keto alcohol-based photopolymerization initiator may, for example, be 2-methyl-2-hydroxypropiophenone or 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropane- 1-ketone and the like. Examples of the aromatic sulfonium chloride-based photopolymerization initiator include 2-naphthalenesulfonium chloride and the like. The photoactive oxime-based photopolymerization initiator may, for example, be 1-phenyl-1,1-propanedione-2-(O-ethoxycarbonyl)-ruthenium or the like. Examples of the benzoin-based photopolymerization initiator include benzoin and the like. The diphenylethylenedione photopolymerization initiator may, for example, be diphenylethylenedione or the like. Examples of the benzophenone-based photopolymerization initiator include benzophenone, benzamidine benzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, and polyethylene. A benzophenone, an α-hydroxycyclohexyl phenyl ketone or the like. The ketal-based photopolymerization initiator may, for example, be a benzyldimethylketal or the like. As the above 9-oxygen sulfur A photopolymerization initiator, for example, 9-oxosulfur 2-chloro 9-oxosulfur 2-methyl 9-oxosulfur 2,4-dimethyl 9-oxosulfur Isopropyl 9-oxosulfur 2,4-diisopropyl 9-oxosulfur Dodecyl 9-oxosulfur Wait. Examples of the above-mentioned fluorenylphosphine oxide-based photopolymerization initiator include 2,4,6-trimethylbenzylidene-diphenyl-phosphine oxide and bis(2,4,6-trimethylbenzene). Mercapto)-phenylphosphine oxide and the like. The above-mentioned titanocene-based photopolymerization initiator may, for example, be bis(η ⁵ -2,4-cyclopentadien-1-yl)-bis(2,6-difluoro-3-(1H-pyrrole) -1-yl)-phenyl) titanium or the like. Further, the photopolymerization initiators may be used singly or in combination of two or more.

In the case where the photopolymerization initiator is used in the polymerization of the acrylic polymer, the amount of the photopolymerization initiator to be used is not particularly limited, and for example, 100 parts by weight based on the total monomer component constituting the acrylic polymer. The portion is preferably 0.01 parts by weight or more, more preferably 0.1 part by weight or more, still more preferably 3 parts by weight or less, still more preferably 1.5 parts by weight or less.

The adhesive layer of the present invention is not particularly limited, and preferably contains a UV absorber (UVA). If the adhesive layer of the present invention contains an ultraviolet absorber, there is a tendency to further reduce the amount of extracted acrylic ions. In particular, in the case where the pressure-sensitive adhesive layer of the present invention is an acrylic pressure-sensitive adhesive layer formed of a solvent-based pressure-sensitive adhesive composition, it is preferred to contain an ultraviolet absorber. Further, the ultraviolet absorbers may be used singly or in combination of two or more.

The ultraviolet absorber is not particularly limited, and examples thereof include a benzotriazole-based ultraviolet absorber and a hydroxyphenyl group. It is an ultraviolet absorber, a benzophenone type ultraviolet absorber, a salicylate type ultraviolet absorber, a cyanoacrylate type ultraviolet absorber, and an oxybenzophenone type ultraviolet absorber.

Examples of the benzotriazole-based ultraviolet absorber (benzotriazole-based compound) include 2-(2-hydroxy-5-tert-butylphenyl)-2H-benzotriazole (trade name "TINUVIN". PS", manufactured by BASF), phenylpropionic acid and 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy (C7-9 side chain) And a linear alkyl ester ester compound (trade name "TINUVIN 384-2", manufactured by BASF Corporation), octyl 3-[3-tert-butyl-4-hydroxy-5-(5-chloro-2H-benzene And triazol-2-yl)phenyl]propionate and 2-ethylhexyl-3-[3-tert-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazole-2 Mixture of phenyl)propionate (trade name "TINUVIN 109", manufactured by BASF Corporation), 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1) -Phenylethyl)phenol (trade name "TINUVIN 900", manufactured by BASF Corporation), 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl) -4-(1,1,3,3-tetramethylbutyl)phenol (trade name "TINUVIN 928", manufactured by BASF), methyl 3-(3-(2H-benzotriazol-2-yl) Reaction product of -5-t-butyl-4-hydroxyphenyl)propionate/polyethylene glycol 300 (trade name "TINUVIN 1130", manufactured by BASF Corporation), 2-(2H-benzotriazole) -2-yl)-p-cresol (trade name "TINUVIN P", manufactured by BASF Corporation), 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1- Phenylethyl)phenol (trade name "TINUVIN 234", manufactured by BASF Corporation), 2-[5-chloro-2H-benzotriazol-2-yl]-4-methyl-6-(t-butyl Phenol (trade name "TINUVIN 326", manufactured by BASF Corporation), 2-(2H-benzotriazol-2-yl)-4,6-di-p-pentylphenol (trade name "TINUVIN 328", BASF Manufactured by the company, 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol (trade name "TINUVIN 329", manufactured by BASF), 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol] (trade name "TINUVIN 360" , manufactured by BASF Corporation, methyl 3-(3-(2H-benzotriazol-2-yl)-5-tert-butyl-4-hydroxyphenyl)propionate and polyethylene glycol 300 Reaction product (trade name "TINUVIN 213", manufactured by BASF Corporation), 2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methylphenol (trade name "TINUVIN 571", Manufactured by BASF, 2-[2-hydroxy-3-(3,4,5,6-tetrahydrophthalimido-methyl)-5-methylphenyl]benzotriazole (commodity) "Sumisorb 250", manufactured by Sumitomo Chemical Co., Ltd.), 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-trioctylphenol] (trade name) "Adekastab LA-31", manufactured by ADEKA Co., Ltd.).

Hydroxyphenyl three UV absorber (hydroxyphenyl three a compound), for example, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-tri Reaction product of 2-(2-)-5-hydroxyphenyl group with [(C10-C16 (mainly C12-C13) alkoxy)methyl]oxirane (trade name "TINUVIN 400", manufactured by BASF Corporation) ,2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-three 2-yl]-5-[3-(dodecyloxy)-2-hydroxypropoxy]phenol), 2-(2,4-dihydroxyphenyl)-4,6-bis-(2 ,4-dimethylphenyl)-1,3,5-three Reaction product with (2-ethylhexyl)-glycidyl ester (trade name "TINUVIN 405", manufactured by BASF Corporation), 2,4-bis(2-hydroxy-4-butoxyphenyl)-6- (2,4-dibutoxyphenyl)-1,3,5-three (trade name "TINUVIN 460", manufactured by BASF), 2-(4,6-diphenyl-1,3,5-three -2-yl)-5-[(hexyl)oxy]-phenol (trade name "TINUVIN 1577", manufactured by BASF Corporation), 2-(4,6-diphenyl-1,3,5-three 2-yl)-5-[2-(2-ethylhexyloxy)ethoxy]-phenol (trade name "Adekastab LA-46", manufactured by ADEKA Co., Ltd.), 2-(2-hydroxyl) -4-[1-octyloxycarbonylethoxy]phenyl)-4,6-bis(4-phenylphenyl)-1,3,5-three (trade name "TINUVIN 479", manufactured by BASF Corporation). In addition, a compound (trade name "TINUVIN 477", manufactured by BASF Corporation) represented by the following formula (5) is also mentioned.

[Chemical 5]

Examples of the benzophenone-based ultraviolet absorber (benzophenone-based compound) and the oxybenzophenone-based ultraviolet absorber (oxybenzophenone-based compound) include 2,4-dihydroxy group. Benzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid (anhydrous and trihydrate), 2-hydroxy-4- Octyloxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 4-benzyloxy-2-hydroxybenzophenone, 2,2'-dihydroxy-4-methyl Oxybenzophenone (trade name "KEMISORB 111", manufactured by Chemipro Kasei Co., Ltd.), 2,2',4,4'-tetrahydroxybenzophenone (trade name "SEESORB 106", limited by Shipro Kasei) Made by the company), 2,2'-dihydroxy-4,4'-dimethoxybenzophenone and the like.

Examples of the salicylate-based ultraviolet absorber (salicylate-based compound) include phenyl 2-propenyloxybenzoate and phenyl 2-propenyloxy-3-methylbenzene. Acid ester, phenyl 2-propenyloxy-4-methyl benzoate, phenyl 2-propenyloxy-5-methyl benzoate, phenyl 2-propenyloxy-3- Methoxybenzoate, phenyl 2-hydroxybenzoate, phenyl 2-hydroxy-3-methylbenzoate, phenyl 2-hydroxy-4-methylbenzoate, phenyl 2-hydroxy-5-methylbenzoate, phenyl 2-hydroxy-3-methoxybenzoate, 2,4-di-t-butylphenyl 3,5-di-third A 4-hydroxybenzoic acid ester (trade name "TINUVIN 120", manufactured by BASF Corporation).

Examples of the cyanoacrylate ultraviolet absorber (cyanoacrylate compound) include an alkyl 2-cyanoacrylate, a cycloalkyl 2-cyanoacrylate, and an alkoxyalkylene. 2-cyanoacrylate, alkenyl 2-cyanoacrylate, alkynyl 2-cyanoacrylate, and the like.

As the above ultraviolet absorbing agent, it has high ultraviolet absorbing property and further improves the corrosion resistance (especially, UV resistance) of the silver nanowire layer, and obtains adhesion with excellent optical characteristics and high transparency. The aspect of the ease of the agent layer and the excellent photostability are preferably selected from the group consisting of a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and a hydroxyphenyl group. It is at least one ultraviolet absorber of the group consisting of a ultraviolet absorber, More preferably, it is a benzotriazole type ultraviolet absorber, and a benzophenone type ultraviolet absorber. More preferably, it is a benzotriazole-based ultraviolet absorber in which a phenyl group having a carbon number of 6 or more and a hydroxyl group as a substituent is bonded to a nitrogen atom constituting the benzotriazole ring.

Further, in the above ultraviolet ray absorbing agent, in order to obtain higher ultraviolet absorbing property and further improve the corrosion resistance (especially, UV resistance) of the silver nanowire layer, it is preferred to obtain the absorbance in the following manner. A is 0.5 or less.

Absorbance A: Absorbance measured by irradiating a light having a wavelength of 400 nm to a 0.08% toluene solution of the above ultraviolet absorber

In the case where the adhesive layer of the present invention contains an ultraviolet absorber, the content of the ultraviolet absorber in the adhesive layer (especially the acrylic adhesive layer) of the present invention is not particularly limited, and the amount of the acrylic acid is extracted. In particular, it is preferably 0.01 parts by weight or more, more preferably 0.05 parts by weight or more, and still more preferably 0.1 parts by weight or more based on 100 parts by weight of the base polymer. Further, the upper limit of the content of the ultraviolet absorber is such that the yellowing phenomenon of the adhesive accompanying the addition of the ultraviolet absorber is suppressed, and excellent optical characteristics, high transparency, and excellent appearance characteristics are obtained. In terms of 100 parts by weight of the base polymer, it is preferably 10 parts by weight or less, more preferably 9 parts by weight or less, still more preferably 8 parts by weight or less.

The adhesive layer of the present invention may also contain a light stabilizer. When the adhesive layer of the present invention contains a light stabilizer, it is particularly preferable to contain light stabilizer together with the above ultraviolet absorber. Agent. The light stabilizer is capable of capturing free radicals generated by photooxidation, thereby improving the resistance of the adhesive layer to light (especially ultraviolet rays). Further, the light stabilizers may be used singly or in combination of two or more.

The light stabilizer is not particularly limited, and examples thereof include a phenol light stabilizer (phenol compound), a phosphorus light stabilizer (phosphorus compound), and a thioether light stabilizer (thioether compound). An amine light stabilizer (amine compound) (especially a hindered amine stabilizer (hindered amine compound)) or the like.

Examples of the phenolic light stabilizer (phenolic compound) include 2,6-di-tert-butyl-4-methylphenol and 4-hydroxymethyl-2,6-di-t-butyl group. Phenol, 2,6-di-t-butyl-4-ethylphenol, butylated hydroxyanisole, n-octadecyl 3-(4-hydroxy-3,5-di-t-butylbenzene Propionate, distearyl (4-hydroxy-3-methyl-5-t-butyl) benzyl malonate, tocopherol, 2,2'-methylene bis (4-methyl) -6-tert-butylphenol), 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 4,4'-methylenebis(2,6-di -T-butylphenol), 4,4'-butylene bis(6-tert-butyl-m-cresol), 4,4'-thiobis(6-t-butyl-m-cresol), Styrenated phenol, N,N'-hexamethylenebis(3,5-di-tert-butyl-4-hydroxybenzamide, bis(3,5-di-t-butyl-4- Ethyl hydroxybenzylphosphonate) Calcium, 1,1,3-tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane, 1,3,5-trimethyl-2 ,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propanoid Oxymethyl]methane, 1,6-hexanediol-bis[3-(3,5-di-t-butyl-4-hydroxyphenyl) Propionate], 2,2'-methylenebis(4-methyl-6-cyclohexylphenol), 2,2'-methylenebis[6-(1-methylcyclohexyl)-p- Phenol], 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanuric acid, 1,3,5-tris (3,5- Di-t-butyl-4-hydroxybenzyl)isocyanuric acid, triethylene glycol-bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate ], 2,2'-oxalylamine bis[ethyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 6-(4-hydroxy-3,5- Di-t-butylanilino)-2,4-dioctylsulfide-1,3,5-three , bis[2-t-butyl-4-methyl-6-(2-hydroxy-3-t-butyl-5-methylbenzyl)phenyl]terephthalate, 3,9- Double {2-[3-(3-t-butyl-4-hydroxy-5-methylphenyl)propanoxy]-1,1-dimethylethyl}-2,4,8,10 -tetraoxaspiro[5.5]undecane, 3,9-bis{2-[3-(3,5-di-t-butyl-4-hydroxyphenyl)propanoxy]-1,1 -Dimethylethyl}-2,4,8,10-tetraoxaspiro[5.5]undecane, and the like.

Examples of the phosphorus-based light stabilizer (phosphorus-based compound) include tris(nonylphenyl)phosphite, tris(2,4-di-t-butylphenyl)phosphite, and tris[2- Third butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenylsulfanyl)-5-methylphenyl], tridecyl phosphite, octyl diphenyl phosphite Ester, bis(indenyl)monophenyl phosphite, ditridecyl pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, bis(nonylphenyl)pentaerythritol diphosphite, double (2,4-di-t-butylphenyl) pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis (2, 4,6-tri-tert-butylphenyl)pentaerythritol diphosphite, tetrakis(tridecyl)isopropylidene diphenol diphosphite, tetrakis(tridecyl)-4,4'- n-Butyl bis(2-tert-butyl-5-methylphenol) diphosphite, hexatridecyl-1,1,3-tris(2-methyl-4-hydroxy-5- Tert-butylphenyl)butyltriphosphite, tetrakis(2,4-di-t-butylphenyl)-biphenyldiphosphite, 9,10-dihydro-9- -10-phosphaphenanthrene-10-oxide, tris(2-[(2,4,8,10-tetra-t-butyldiphenyl[d,f][1,3,2]dioxaphosphorus Heterocyclic heptene-6-yl)oxy]ethyl)amine and the like.

Examples of the thioether-based light stabilizer (thioether compound) include dialkyl thiodipropionate compounds such as dilauryl thiodipropionate, dimyristyl ester, and distearyl; [Methylene (3-dodecylsulfonate) propionate] A β-alkylmercaptopropionate compound of a polyhydric alcohol such as methane.

Examples of the amine light stabilizer (amine compound) include a polymer of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol (trade name " TINUVIN 622", manufactured by BASF), dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol polymer with N,N',N",N'''-Tetra-(4,6-bis-(butyl-(N-methyl-2,2,6,6-tetramethylpiperidin-4-yl)amino)-three 1-on-1,7-diazadecane-1,10-diamine-to-one reaction product (trade name "TINUVIN 119", manufactured by BASF Corporation), dibutylamine ‧1,3- three ‧ N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl-1,6-hexanediamine and N-(2,2,6,6-tetramethyl-4) - piperidinyl) butylamine polycondensate (trade name "TINUVIN 2020", manufactured by BASF Corporation), poly[{6-(1,1,3,3-tetramethylbutyl)amino-1,3, 5-three -2-4-diyl}{2,2,6,6-tetramethyl-4-piperidinyl}imino]hexamethylene {(2,2,6,6-tetramethyl-4) -piperidinyl)imine} (trade name "TINUVIN 944", manufactured by BASF), bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and Mixture of 1,2,2,6,6-pentamethyl-4-piperidinyl sebacate (trade name "TINUVIN 765", manufactured by BASF), double (2, 2, 6, 6-four Methyl-4-piperidinyl) sebacate (trade name "TINUVIN 770", manufactured by BASF Corporation), bis(2,2,6,6-tetramethyl-1-(octyloxy) sebacate Reaction product of 4-piperidinyl)ester, 1,1-dimethylethylhydroperoxide and octane (trade name "TINUVIN 123", manufactured by BASF), double (1, 2, 2, 6) ,6-pentamethyl-4-piperidinyl)[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]butylmalonate (trade name) "TINUVIN 144", manufactured by BASF Corporation), cyclohexane and N-butyl 2,2,6,6-tetramethyl-4-piperidinamine-2,4,6-trichloro-1,3 , 5-three The reaction product of the reaction product with 2-aminoethanol (trade name "TINUVIN 152", manufactured by BASF Corporation), bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacic acid Mixture of ester and methyl 1,2,2,6,6-pentamethyl-4-piperidinyl sebacate (trade name "TINUVIN 292", manufactured by BASF), 1,2,3,4- Butyric acid and 1,2,2,6,6-pentamethyl-4-piperidinol and 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4, A mixed esterified product of 8,10-tetraoxaspiro[5.5]undecane (trade name "Adekastab LA-63P", manufactured by ADEKA Co., Ltd.). As the amine stabilizer, a hindered amine stabilizer is particularly preferred.

In the case where the adhesive layer of the present invention contains a light stabilizer, the content of the light stabilizer in the adhesive layer (especially the acrylic adhesive layer) of the present invention is not particularly limited, and it is easy to exhibit resistance to light. In terms of 100 parts by weight of the base polymer, it is preferably 0.1 part by weight or more, more preferably 0.2 part by weight or more. Further, with respect to the upper limit of the above content, it is difficult to produce a coloration caused by the light stabilizer itself and it is easy to obtain high transparency, and in terms of optical characteristics, with respect to 100 parts by weight of the base polymer, It is preferably 5 parts by weight or less, more preferably 3 parts by weight or less.

The formation of the pressure-sensitive adhesive layer of the present invention is not particularly limited, and a crosslinking agent can also be used. For example, the acrylic polymer in the acrylic pressure-sensitive adhesive layer can be crosslinked to control the gel fraction. Further, the crosslinking agents may be used singly or in combination of two or more.

The crosslinking agent is not particularly limited, and examples thereof include an isocyanate crosslinking agent, an epoxy crosslinking agent, a melamine crosslinking agent, a peroxide crosslinking agent, a urea crosslinking agent, and a metal alkane. An oxide crosslinking agent, a metal chelate crosslinking agent, a metal salt crosslinking agent, a carbon diimide crosslinking agent, An oxazoline crosslinking agent, an aziridine crosslinking agent, an amine crosslinking agent, and the like. Among them, an isocyanate crosslinking agent and an epoxy crosslinking agent are preferable, and an isocyanate crosslinking agent is more preferable.

Examples of the isocyanate-based crosslinking agent (polyfunctional isocyanate compound) include a low-grade such as 1,2-ethylidene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate. Aliphatic polyisocyanates; cyclopentyl diisocyanate, cyclohexyl diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, hydrogenated xylene diisocyanate and other alicyclic polyisocyanates; 2,4-toluene An aromatic polyisocyanate such as isocyanate, 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate or benzodimethyl diisocyanate. In addition, examples of the isocyanate-based crosslinking agent include a trimethylolpropane/toluene diisocyanate adduct (trade name "Coronate L", manufactured by Nippon Polyurethane Industry Co., Ltd.), and trimethylolpropane/ Hexamethylene diisocyanate adduct (trade name "Coronate HL", manufactured by Nippon Polyurethane Industry Co., Ltd.), trimethylolpropane / dimethyl dimethyl diisocyanate adduct (trade name "Takenate D-110N" Commercial products such as Mitsui Chemicals Co., Ltd.).

Examples of the epoxy-based crosslinking agent (polyfunctional epoxy compound) include N, N, N', N'-tetraglycidyl-m-xylylenediamine, diglycidylaniline, and 1, 3-bis(N,N-diglycidylaminomethyl)cyclohexane, 1,6-hexanediol diglycidyl ether, new Pentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether , pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether, diglycidyl adipate, diglycidyl phthalate, three Glycidyl-tris(2-hydroxyethyl)isocyanurate, resorcinol diglycidyl ether, bisphenol-S-diglycidyl ether, and may also be exemplified by two in the molecule. An epoxy resin such as the above epoxy group. In addition, as the epoxy-based crosslinking agent, for example, a commercial product such as "Tetrad C" (manufactured by Mitsubishi Gas Chemical Co., Ltd.) may be mentioned.

In the case where a crosslinking agent is used in the formation of the adhesive layer of the present invention, the amount of the crosslinking agent used is not particularly limited, and 100 parts by weight relative to the base polymer is obtained in terms of sufficient subsequent reliability. It is preferably 0.001 parts by weight or more, more preferably 0.01 parts by weight or more. Further, the upper limit of the amount of use is preferably 10 parts by weight or less, more preferably 5 parts by weight, based on 100 parts by weight of the base polymer, in terms of obtaining an appropriate softness of the pressure-sensitive adhesive layer and improving the adhesion. the following.

The adhesive layer of the present invention (especially the acrylic adhesive layer) may also contain a decane coupling agent in terms of improving the subsequent reliability under humidification conditions, particularly in terms of improving the reliability of the glass. . Further, the decane coupling agent may be used singly or in combination of two or more. When the pressure-sensitive adhesive layer contains a decane coupling agent, the adhesion under humidification conditions, particularly the adhesion to glass, can be improved.

The decane coupling agent is not particularly limited, and examples thereof include γ-glycidoxypropyltrimethoxydecane, γ-glycidoxypropyltriethoxydecane, and γ-aminopropyltrimethoxy. Basear, N-phenyl-aminopropyltrimethoxydecane, and the like. Further, as the decane coupling agent, for example, a commercially available product such as "KBM-403" (manufactured by Shin-Etsu Chemical Co., Ltd.) may be mentioned. Among them, as the above decane coupling agent, γ-glycidoxypropyltrimethoxydecane is preferred.

In the case where the adhesive layer of the present invention contains a decane coupling agent, the content of the above decane coupling agent in the adhesive layer (especially the acrylic pressure-sensitive adhesive layer) of the present invention is not particularly limited, and is relative to the above-mentioned base polymer 100. The parts by weight are preferably 0.01 parts by weight or more, more preferably 0.02 parts by weight or more. Further, the upper limit of the content of the decane coupling agent is preferably 1 part by weight or less, more preferably 0.5 part by weight or less based on 100 parts by weight of the base polymer.

The pressure-sensitive adhesive layer of the present invention may further contain a crosslinking accelerator, an adhesion-imparting resin (rosin derivative, polyterpene resin, petroleum resin, oil-soluble phenol, etc.) and an anti-corrosion agent, as long as the effect of the present invention is not impaired. Additives such as an aging agent, a filler, a colorant (pigment or dye, etc.), an antioxidant, a chain transfer agent, a plasticizer, a softener, a surfactant, an antistatic agent, and the like. Further, the above additives may be used singly or in combination of two or more.

In the case where the adhesive layer of the present invention is formed from a solvent-type acrylic adhesive composition (that is, when the adhesive layer of the present invention is a solvent-based acrylic adhesive layer), the adhesive layer of the present invention is In view of the fact that the amount of the extracted acrylate ion is 5 μg/g or less per 1 g of the adhesive layer, it is preferable to contain an acrylic polymer and an ultraviolet absorber, and more preferably an adhesive layer. The total weight of 100% by weight of the acrylic polymer is 50% by weight or more, and the UV absorber is contained in an amount of 0.05 to 9 parts by weight (preferably 0.1 to 8 parts by weight) based on 100 parts by weight of the acrylic polymer. Further, the adhesive layer of the present invention is particularly preferably contained in an amount of 100% by weight based on the total weight of the adhesive layer: an alkyl (meth)acrylate comprising a linear or branched alkyl group having 4 to 18 carbon atoms. 50 to 90% by weight (preferably 55 to 85% by weight) of the ester, and 10 to 50% by weight of one or more monomers selected from the group consisting of a monomer containing a nitrogen atom and a monomer having a hydroxyl group (Comparative) Acrylic polymer 50 composed of a monomer mixture of preferably 10 to 40% by weight of a monomer having an alicyclic structure of 6 to 10 and 0 to 40% by weight (preferably 0 to 30% by weight) The weight% or more is 0.05 to 9 parts by weight (preferably 0.1 to 8 parts by weight) based on 100 parts by weight of the acrylic polymer.

When the adhesive layer of the present invention is formed from the active energy ray-curable acrylic adhesive composition (that is, when the adhesive layer of the present invention is an active energy ray-curable acrylic adhesive layer), the present invention In the adhesive layer, the amount of the extracted acrylic acid ions is set to be 5 μg/g or less per 1 g of the adhesive layer, and in the above, it is preferable to contain a linear chain having a carbon number of 4 to 18. Or a branched alkyl alkyl (meth) acrylate 50 to 90% by weight (preferably 55 to 85% by weight) selected from the group consisting of a monomer containing a nitrogen atom and a monomer having a hydroxyl group. The acrylic polymer composed of a monomer mixture of 10 to 50% by weight (preferably 15 to 40% by weight) of one or more kinds of monomers preferably contains a linear chain having a carbon number of 4 to 18 or 50 to 90% by weight (preferably 55 to 85% by weight) of a branched alkyl alkyl (meth)acrylate, selected from the group consisting of a monomer containing a nitrogen atom and a monomer having a hydroxyl group The acrylic polymer composed of a monomer mixture of 10 to 50% by weight (preferably 15 to 40% by weight) of one or more kinds of monomers is 50% by weight or more. Further, the adhesive layer of the present invention preferably contains 50 to 90% by weight (preferably 55 to 50% by weight of an alkyl (meth)acrylate containing a linear or branched alkyl group having 4 to 18 carbon atoms. 85 wt%), 3 to 30% by weight of a monomer containing a nitrogen atom (preferably 5 to 25% by weight), 0.8 to 25% by weight (preferably 1 to 15% by weight) of a monomer having a hydroxyl group, and carbon The number of monomers having 6 to 10 alicyclic structures is 0 to 40% by weight (preferably 0 to 30% by weight), and the ratio of the monomer containing a nitrogen atom to the monomer having a hydroxyl group is 10 to 50% by weight. The acrylic polymer composed of a monomer mixture (preferably 15 to 40% by weight) is 50% by weight or more.

The haze of the pressure-sensitive adhesive layer of the present invention is not particularly limited, and is preferably 5% or less, more preferably 3% or less, and still more preferably 1% or less in terms of appearance characteristics, transparency, and optical characteristics. In the present specification, the haze can be measured, for example, using a fog meter in accordance with JIS K 7136.

The total light transmittance of the pressure-sensitive adhesive layer of the present invention is not particularly limited, and is preferably 85% or more, more preferably 90% or more, and still more preferably 92% in terms of appearance characteristics, transparency, and optical characteristics. the above. Furthermore, in the present specification, the total light transmittance can be, for example, It is sufficient to use a fog meter and measure according to JIS K 7361-1. Further, the total light transmittance is a transmittance of light (visible light) having a wavelength of 400 to 780 nm.

The a ^* of the adhesive layer of the present invention is not particularly limited, and is preferably -0.5 or more, more preferably -0.3 or more, and still more preferably -0.1 in terms of obtaining excellent optical characteristics and excellent appearance characteristics. the above. Moreover, in terms of obtaining excellent optical characteristics and excellent appearance characteristics, it is preferably 0.5 or less, more preferably 0.3 or less, still more preferably 0.1 or less. Furthermore, the present specification, a ^* value based L ^* a ^* b ^* color system of the a ^* value, based on JIS Z 8781-4 (2013 years), and using for example Simple spectral colorimeter (trade name "DOT-3C "Measured by Murakami Color Technology Research Institute Co., Ltd.".

The b ^* of the adhesive layer of the present invention is not particularly limited, but is preferably 0.7 or less, more preferably 0.5 or less, still more preferably 0.4 or less. When b ^* is 0.7 or less, optical characteristics are excellent and appearance characteristics are excellent. The optical article using the optical adhesive sheet of the present invention (especially an optical article having a display panel represented by an LCD) has an advantage of not impairing the brightness of the screen, the density of the color, and the color tone. Furthermore, the present specification, the value of b ^* L ^* a ^* b ^* color system of the b ^* value, it is possible Z 8781-4 (2013 years) using, for example according to JIS Simple spectral colorimeter (trade name "DOT- 3C", manufactured by Murakami Color Technology Research Institute Co., Ltd.).

The thickness of the pressure-sensitive adhesive layer of the present invention is not particularly limited, and it is preferably 12 μm or more, more preferably in terms of ensuring ultraviolet absorbing property and obtaining sufficient adhesion reliability to the silver nanowire layer or the protective layer described below. It is 15 μm or more, more preferably 20 μm or more, and particularly preferably 70 μm or more. When the thickness is 12 μm or more, there is a tendency to further reduce the amount of extracted acrylic ions, which is preferable. Further, the thickness is preferably 500 μm or less, preferably 300 μm or less, and more preferably 200 μm or less in terms of optical characteristics.

The method for producing the pressure-sensitive adhesive layer (especially the acrylic pressure-sensitive adhesive layer) of the present invention is not particularly limited, and examples thereof include applying (coating) the pressure-sensitive adhesive composition to a substrate or peeling off the adhesive composition. Applying the obtained adhesive composition layer to dryness and hardening on the liner; or coating (coating) the above adhesive composition on a substrate or a release liner to irradiate the obtained adhesive composition layer with active energy Line hardens it. Further, it may be further dried by heating as needed.

Examples of the active energy ray include free radiation such as α rays, β rays, γ rays, neutron rays, and electron beams, or ultraviolet rays, and particularly preferably ultraviolet rays. Further, the irradiation energy of the active energy ray, the irradiation time, the irradiation method, and the like are not particularly limited.

The above adhesive composition can be produced by a known or customary method. For example, a solvent-type acrylic pressure-sensitive adhesive composition can be produced by mixing an additive (for example, an ultraviolet absorber or the like) as needed in a solution containing the above acrylic polymer. For example, the active energy ray-curable acrylic pressure-sensitive adhesive composition can be produced by mixing an additive (for example, an ultraviolet absorber or the like) as needed in a mixture of the above acrylic monomers or a part thereof.

Further, a coating method known in the art can also be applied to the application (coating) of the above adhesive composition. For example, a gravure roll coater, a reverse roll coater, a contact roll coater, a dip roll coater, a bar coater, a knife coater, a spray coater, a notch coater, and the like can also be used. A coater such as a coater.

In particular, in the case where the active energy ray-curable adhesive composition is used to form an adhesive layer, it is preferred that the active energy ray-curable adhesive composition contains a photopolymerization initiator. Further, in the case where the active energy ray-curable adhesive composition contains an ultraviolet absorber, it is preferred to use a photopolymerization initiator having a light absorbing property in a wide wavelength range as a photopolymerization initiator. For example, it is preferred to contain at least a photopolymerization initiator which absorbs light characteristics in addition to ultraviolet light. The reason for this is that there is a concern that the curing by the active energy ray is suppressed by the action of the ultraviolet absorbing agent. However, if a photopolymerization initiator having a light absorbing property in a wide wavelength range is included, the adhesive composition is easily obtained. High light hardenability.

(substrate)

The substrate for the optical adhesive sheet of the present invention is not particularly limited as long as it is a pressure-sensitive adhesive sheet with a base material, and examples thereof include various films such as a plastic film, an anti-reflection (AR) film, a polarizing plate, and a phase difference plate. membrane. Examples of the material of the plastic film and the like include a polyester resin such as polyethylene terephthalate (PET), an acrylic resin such as polymethyl methacrylate (PMMA), polycarbonate, and triethylene sulfonate. Cellulose (TAC), polyfluorene, polyarylate, polyimine, polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, ethylene-propylene copolymer, trade name "ARTON" (cyclic olefin polymerization) A plastic material such as a cyclic olefin polymer such as ZEONOR (a cyclic olefin polymer, manufactured by Japan ZEON Co., Ltd.). Further, these plastic materials may be used alone or in combination of two or more. In addition, the "substrate" refers to a portion that is attached to the adherend together with the adhesive layer when the adhesive sheet is attached to the adherend (optical member or the like). The release liner that is peeled off during use of the adhesive sheet (when attached) is not included in the "substrate".

The above substrate is preferably transparent. The total light transmittance (in accordance with JIS K 7361-1) of the visible light wavelength region of the substrate is not particularly limited, but is preferably 85% or more, and more preferably 88% or more. Further, the haze of the substrate (in accordance with JIS K 7136) is not particularly limited, but is preferably 1.5% or less, more preferably 1.0% or less.

The thickness of the substrate is not particularly limited, and is, for example, preferably 12 to 75 μm. Further, the substrate may have any one of a single layer and a plurality of layers. Further, for the surface of the substrate, for example, a known conventional surface treatment such as a physical treatment such as a corona discharge treatment or a plasma treatment or a chemical treatment such as a primer treatment may be suitably employed.

(release liner)

The optical adhesive sheet of the present invention may be provided with a release liner (spacer) on the surface (adhesive surface) of the adhesive layer until use. Furthermore, in the case where the optical adhesive sheet of the present invention is a double-sided adhesive sheet, each adhesive surface can be separately protected by two release liners, or a double release liner which is a release surface can be used for the roll. Winding form (rolled body) Protected. The release liner is used as a protective material for the adhesive layer and is peeled off when attached to the adherend. Further, in the case where the optical adhesive sheet of the present invention is a substrate-free adhesive sheet, the release liner also functions as a support for the adhesive layer. Furthermore, it is not necessary to provide a release liner.

As the release liner, a conventional release paper or the like can be used, and examples thereof include a substrate having a release treatment layer, a low adhesion substrate comprising a fluoropolymer, or a low adhesion substrate comprising a nonpolar polymer. However, there is no particular limitation. The base material having the release treatment layer is, for example, a plastic film or paper which has been subjected to surface treatment by a release treatment agent such as polyfluorinated or long-chain alkyl, fluorine or molybdenum sulfide. Examples of the fluorine-based polymer in the low-adhesive substrate containing the fluoropolymer include polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, and tetrafluoroethylene-hexafluorocarbon. A propylene copolymer, a chlorofluoroethylene-vinylidene fluoride copolymer or the like. Moreover, examples of the nonpolar polymer include an olefin resin (for example, polyethylene, polypropylene, etc.). Further, the release liner can be formed by a known or customary method. Further, the thickness of the release liner is also not particularly limited.

(Optical adhesive sheet of the present invention)

The thickness of the optical adhesive sheet of the present invention is not particularly limited, but is preferably 12 μm or more, more preferably 15 μm or more, further preferably 20 μm or more, and particularly preferably 50 μm or more. Further, the thickness is preferably 500 μm or less, preferably 300 μm or less, and more preferably 200 μm or less in terms of optical characteristics. Furthermore, the thickness of the optical adhesive sheet of the present invention does not include the thickness of the above release liner.

The optical adhesive sheet of the present invention is attached to an optical member having a silver nanowire layer and is exposed to ultraviolet rays for 100 hours (hereinafter sometimes referred to as "resistance value after 100 hours of UV irradiation") with respect to the adhesive sheet. The ratio of the resistance value (sometimes referred to as the "resistance value immediately after attachment") attached to the optical member having the silver nanowire layer [(resistance value after 100 hours of UV irradiation) / (just after attachment) The resistance value)] (times) (sometimes referred to as "resistance value increase rate") is not particularly limited, but is preferably 3 times or less (for example, 0 to 3 times), more preferably 2 times or less (for example, 0 to 2). Times), Further, it is preferably 1.5 times or less (for example, 0 to 1.5 times).

In addition, the above-mentioned "electrical resistivity after 100 hours of UV irradiation" can be measured, for example, by attaching an optical adhesive sheet to an optical member having a silver nanowire layer at a temperature of 45 ° C and a humidity of 50% RH. In the environment, the resistance value obtained by irradiating ultraviolet rays for 100 hours at 65 W/cm ² was obtained. Further, the above-mentioned "resistivity after bonding" and the above-mentioned "resistivity after 100 hours of UV irradiation" can be measured using a known or conventional resistance value measuring device, and for example, the product name "EC-80" can be used (Napson) Co., Ltd. manufactured) was measured. Further, a known or conventional ultraviolet ray irradiator can be used for the ultraviolet ray irradiation, and for example, a product name "Super Xenon Weather Meter SX75" (manufactured by Suga Test Instruments Co., Ltd.) can be used. Further, in the case of measuring the electrical resistivity, when the optical adhesive sheet is attached to an optical member having a silver nanowire layer, the optical adhesive sheet is preferably attached to the surface with the following protective layer. Silver nanowire layer.

The haze of the optical adhesive sheet of the present invention is not particularly limited, and is preferably 5% or less, more preferably 3% or less, still more preferably 1% or less in terms of appearance characteristics, transparency, and optical characteristics. .

The total light transmittance of the optical adhesive sheet of the present invention is not particularly limited, and is preferably 85% or more, more preferably 90% or more, and still more preferably 92 in terms of appearance characteristics, transparency, and optical characteristics. %the above.

The a ^* of the optical adhesive sheet of the present invention is not particularly limited, and is preferably -0.5 or more, more preferably -0.3 or more, and further preferably - in terms of obtaining excellent optical characteristics and excellent appearance characteristics. 0.1 or more. Moreover, in terms of obtaining excellent optical characteristics and excellent appearance characteristics, it is preferably 0.5 or less, more preferably 0.3 or less, still more preferably 0.1 or less.

The b ^* of the optical adhesive sheet of the present invention is not particularly limited, and is preferably 0.7 or less, more preferably 0.5 or less, still more preferably 0.4 or less from the viewpoint of obtaining excellent optical characteristics and excellent appearance characteristics.

The adhesive force on the side of the adhesive layer of the present invention for the optical adhesive sheet of the present invention is not particularly limited, and is preferably 6 N/20 mm in terms of the subsequent reliability of the silver nanowire layer or the protective layer described below. The above is more preferably 7 N/20 mm or more, and still more preferably 10 N/20 mm or more. The adhesive force is a 180° peeling adhesive force, and can be measured by peeling off from the adherend at a tensile speed of 300 mm/min and a tensile angle of 180° (degrees) in accordance with JIS Z 0237.

The prior optical adhesive sheet is obtained by extracting the acrylic ion and the methacrylate from the adhesive sheet by reducing the amount of (meth)acrylic acid used as a monomer component of the acrylic polymer in the adhesive layer. The content of the ions is set to be 20 ng/cm ² or less per unit area of the adhesive layer, and the corrosion resistance to the attached metal thin film is improved. With regard to such a conventional optical adhesive sheet, if (meth)acrylic acid is not used as a monomer component for forming a polymer in the adhesive layer, the content of the acrylate ion and the methacrylate ion can be set to 20 ng/ Below cm ² . However, such a conventional optical adhesive sheet has sufficient corrosion resistance to the ITO layer, but has insufficient corrosion resistance to the silver nanowire layer. That is, even if (meth)acrylic acid is not used as the monomer component of the polymer in the adhesive layer, the corrosion resistance of the adhesive sheet to the silver nanowire layer may be insufficient. On the other hand, the optical adhesive sheet for optical use of the present invention is an optical adhesive sheet for a silver nanowire layer, which is obtained by ion chromatography and is extracted from pure adhesive layer at 100 ° C for 45 minutes by using pure water. The amount of the acrylate ion is 5 μg/g or less per 1 g of the adhesive layer, whereby the adhesive layer becomes the optical member side of the silver nanowire layer (especially When the optical adhesive sheet of the present invention is attached directly to the silver nanowire layer or to the layer for protecting the silver nanowire layer, it is also possible to suppress silver caused by the acrylic acid ions by attaching the optical adhesive sheet of the present invention. The ionization of silver in the nanowire layer improves corrosion resistance (especially UV resistance) and suppresses an increase in resistance (especially when the ultraviolet ray is irradiated).

The optical adhesive sheet of the present invention is preferably produced according to a known or conventional manufacturing method. Made, but there is no special limit. For example, in the case where the optical adhesive sheet of the present invention is a substrate-free adhesive sheet, it can be obtained by forming the adhesive layer of the present invention on a release liner by the above method. Moreover, in the case where the optical adhesive sheet of the present invention is an adhesive sheet with a base material, it can also be obtained by directly forming the adhesive layer of the present invention on the surface of the substrate (direct printing method), or by It is obtained by temporarily forming an adhesive layer of the present invention on a release liner and then transferring (bonding) it to the substrate, whereby the adhesive layer of the present invention (transfer method) is provided on the substrate.

The optical adhesive sheet of the present invention can be used for optical applications. More specifically, it can be used for the purpose of attaching the optical member in an article (optical article) in which an optical member having a silver nanowire layer can be used (optical use for a silver nanowire layer). Furthermore, when the optical adhesive sheet of the present invention is attached to an optical member having a silver nanowire layer, the adhesive surface of the adhesive layer of the present invention can be attached in such a manner as to be in contact with the silver nanowire layer (directly attached) Attached) may be attached to a layer other than the silver nanowire layer (for example, a protective layer, an optical member other than the silver nanowire layer, etc.). The optical adhesive sheet of the present invention is particularly preferably used for directly attaching to a silver nanowire layer or to a layer for protecting a silver nanowire layer (the protective layer described below) (silver nanowire layer sticker) Attached). Examples of the silver nanowire layer include a layer obtained by screen printing a fine metal wire containing silver, a film (silver nanowire film) formed by a metal thin wire (nanowire) containing silver, and the like.

The optical member refers to a member having optical characteristics (for example, polarizability, light refraction, light scattering, light reflectivity, light permeability, light absorptivity, light diffraction, optical rotation, visibility, etc.). The substrate constituting the optical member is not particularly limited, and examples thereof include a substrate constituting a device (optical device) such as a display device (image display device) and an input device, or a substrate for the device, and examples thereof include, for example, a polarizing plate, a wave plate, a phase difference plate, an optical compensation film, a brightness enhancement film, a light guide plate, a reflection film, an anti-reflection film, a hard coating film (a film which is hard-coated on at least one side of a plastic film, such as a PET film), Transparent conductive film, design film, decorative film, surface protection board, enamel, lens, color filter, a transparent substrate (a glass sensor, a glass display panel (LCD or the like), a glass substrate such as a glass plate with a transparent electrode, or the like) or a substrate (hereinafter sometimes referred to as a "functional film") )Wait. Moreover, these films may have a printed layer, a conductive polymer layer, or the like. In addition, the "plate" and the "film" are respectively in the form of a plate, a film, or a sheet. For example, the "polarizing film" includes a "polarizing plate" and a "polarizing plate".

As the optical member, a touch sensor or a film sensor can also be cited. More specifically, a film having an ITO (indium tin oxide) layer on the surface; a film having a zinc oxide (ZnO) layer on the surface; a film obtained by surface-coating a solution containing metal nanoparticles, by a film obtained by screen-printing a surface of a solution containing a metal nanoparticle using a metal nanoparticle; a film obtained by surface-coating a dispersion containing a carbon nanotube, by using carbon a film using a carbon nanotube such as a film obtained by screen printing on a surface of a solution; a film using a graphene layer on a surface thereof; a conductive polymer having a surface; A film of a layer, a transparent conductive film such as a film using a conductive polymer such as a film obtained by screen printing using a solution containing a conductive polymer. In addition, a film using a metal (especially copper) such as a film in which a mesh-like metal thin line pattern is applied to a film or a film having a metal layer may be used. Further, a silver nanowire film can be cited. Further, among the optical members described above, the optical adhesive sheet of the present invention has a silver nanowire layer.

Examples of the display device include a liquid crystal display device, an organic EL (electroluminescence) display device, a PDP (plasma display panel), and electronic paper. Moreover, as the input device, a touch panel or the like can be cited.

The substrate constituting the optical member is not particularly limited, and examples thereof include glass, acrylic resin, polycarbonate, polyethylene terephthalate, cycloolefin polymer, and a substrate including a metal thin film (for example, a sheet). Shape, film, plate-like substrate, etc.). Further, in the "optical member" of the present invention, as described above, a member that retains the visibility of the display device or the input device and functions as a decoration or protection (design film, decoration) is also included. Membrane or surface protective film, etc.).

In the above optical member, the silver nanowire layer can also be protected by a protective layer. That is, in the optical member, a protective layer (layer protecting the silver nanowire layer) may be provided on the silver nanowire layer.

The protective layer preferably contains a resin as an essential component. The resin may be a known or customary resin, and examples thereof include an acrylic resin; a polyester resin such as polyethylene terephthalate; and a fragrance such as polystyrene, polyvinyltoluene or polyvinyl xylene; Family resin; polyimine; polyamine; polyamidoximine; polyurethane resin; epoxy resin; polyolefin resin; acrylonitrile-butadiene-styrene copolymer (ABS); cellulose resin; polyoxynene resin; polyvinyl chloride; polyacetate; Alkene; synthetic rubber; fluorine-based resin. The resin may be a conductive resin (conductive resin), and examples thereof include conductive resins such as poly(3,4-ethylenedioxythiophene) (PEDOT), polyaniline, polythiophene, and polydiacetylene. . Among them, an acrylic resin is preferred. The ratio of the resin (especially the acrylic resin) in the protective layer is not particularly limited, and is preferably 50% by weight or more (for example, 50 to 100% by weight) based on the total weight (100% by weight) of the protective layer. It is preferably 70% by weight or more, and more preferably 95% by weight or more.

Examples of the acrylic resin include an acrylic polymer exemplified and described as the base polymer contained in the pressure-sensitive adhesive layer of the present invention. Among them, a curable resin (preferably an ultraviolet curable resin) composed of the above polyfunctional monomer is preferred, and more preferably pentaerythritol triacrylate (PETA) or neopentyl glycol diacrylate (NPGDA). a curable resin (preferably an ultraviolet curable resin) composed of a polyfunctional acrylate such as dipentaerythritol hexaacrylate (DPHA), dipentaerythritol pentaacrylate (DPPA) or trimethylolpropane triacrylate (TMPTA) . When the acrylic resin contains the polyfunctional monomer as a monomer component constituting the resin, the ratio of the polyfunctional monomer in all the monomer components (100% by weight) constituting the acrylic resin is not It is particularly preferably 50% by weight or more (for example, 50 to 100% by weight), more preferably 70%. The weight% or more is more preferably 90% by weight or more, and particularly preferably 95% by weight or more.

A photopolymerization initiator (photoinitiator) can also be used for the polymerization of the above monomer components. The photopolymerization initiator may, for example, be the above photopolymerization initiator. In the case of using a photopolymerization initiator, the amount of the photopolymerization initiator to be used is not particularly limited. For example, it is preferably 0.01 parts by weight or more based on 100 parts by weight of all the monomer components constituting the acrylic resin. More preferably, it is 0.1 part by weight or more, further preferably 10 parts by weight or less, more preferably 7 parts by weight or less.

The above protective layer may be formed by using the above crosslinking agent. Further, the protective layer may further contain a stabilizer, an anticorrosive agent, an anti-aging agent, a filler, a colorant (pigment or dye, etc.), an antioxidant, a plasticizer, a softener, a surfactant, an antistatic agent, etc., as needed. additive.

The protective layer may be disposed to cover the silver nanowire layer (in the manner of burying the silver nanowire layer), or may be disposed in such a manner that one of the silver nanowire layers is exposed from the surface of the protective layer.

More specifically, the aspect in which the optical adhesive sheet of the present invention is used for the silver nanowire layer in optical applications will be described. Fig. 1 and Fig. 2 show an example of the aspect in which the optical adhesive sheet of the present invention is used for a silver nanowire layer use (especially for silver nanowire layer attachment) in optical applications. Figures 1 and 2 also correspond to the aspects used in the membrane sensor. Further, the aspect in which the optical adhesive sheet of the present invention is used for the silver nanowire layer in optical applications is not limited to the aspects of Figs. 1 and 2 . 1 and 2 are schematic cross-sectional views showing an example of an optical product using the optical adhesive sheet of the present invention. Moreover, the optical product of FIGS. 1 and 2 has a structure in which an optical member is bonded via the optical adhesive sheet of the present invention. In Fig. 1 and Fig. 2, 1 is an optical product, 11 is an outer cover, 12 is an optical adhesive sheet of the present invention, 13 is a base material, 14 is a silver nanowire layer, and 15 is a protective layer. The outer cover 11 is a cover glass or a housing lens. The substrate 13 is a substrate on which the silver nanowire layer 14 is carried.

In FIG. 1, an optical member having a silver nanowire layer is used as an optical member, and an optical adhesive sheet of the present invention is laminated on one side of the silver nanowire layer 14 via a protective layer 15. 12. Further, the protective layer 15 is provided in such a manner as to cover the silver nanowire layer 14 (in the manner of burying the silver nanowire layer 14). Therefore, the optical adhesive sheet of the present invention is used for a silver nanowire layer (especially for silver nanowire layer attachment).

In Fig. 2, as in Fig. 1, an optical member having a silver nanowire layer is used as an optical member. Further, in the optical product 1 shown in Fig. 2, the optical adhesive sheet 12 of the present invention is used as it is directly attached to the silver nanowire layer 14. Further, the protective layer 15 is provided to expose the silver nanowire layer 14. Therefore, the optical adhesive sheet of the present invention is used for a silver nanowire layer (especially for silver nanowire layer attachment).

In the optical product 1 of Figs. 1 and 2, the optical adhesive sheet 12 of the present invention is attached to an optical member having a silver nanowire layer 14. Moreover, the optical adhesive sheet 12 of the present invention is excellent in corrosion resistance to the silver nanowire layer. Therefore, the optical article 1 effectively suppresses corrosion of the silver nanowire layer caused by the acrylate ions. As described above, since the optical product 1 uses the optical adhesive sheet 12 of the present invention, corrosion of the silver nanowire layer is suppressed, and deterioration of the optical product 1 is also suppressed.

(Optical member with optical adhesive sheet for silver nanowire layer)

An optical member to which an optical adhesive sheet for a silver nanowire layer is attached includes at least the optical member and the optical adhesive sheet of the present invention.

The optical member to which the optical adhesive sheet for a silver nanowire layer is attached is, for example, an optical material of the present invention in which the base material is an optical member provided with a silver nanowire layer and has an adhesive sheet with a base material. Use adhesive sheets. More specifically, an adhesive sheet in which the adhesive layer of the present invention is provided on at least one side of the silver nanowire layer via a protective layer and/or a sheet-like or film-like optical member; or silver At least one side of the nanowire layer is provided with an adhesive sheet such as an adhesive sheet of the adhesive layer of the present invention or the like, and the like.

According to the above-mentioned optical member-attached adhesive sheet, the optical member having the silver nanowire layer can be fixed or temporarily fixed to a desired position via the adhesive surface of the optical adhesive sheet of the present invention. Moreover, the optical adhesive sheet of the present invention effectively suppresses the layer of silver nanowires corrosion. Therefore, the above-mentioned adhesive sheet with an optical member is difficult to suppress deterioration caused by corrosion of the silver nanowire layer.

(optical products)

The optical article includes at least an optical member provided with a silver nanowire layer and the optical adhesive sheet of the present invention. The optical product is not particularly limited, and examples thereof include an optical product (optical product 1) shown in Fig. 1 or Fig. 2 and the like. The optical article includes the optical adhesive sheet of the present invention which is excellent in corrosion resistance (especially, UV resistance) of the silver nanowire layer, and therefore the optical article is less likely to be corroded by the silver nanowire layer (especially due to ultraviolet rays). Deterioration caused by corrosion of the silver nanowire caused by the irradiation.

[Examples]

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited by the examples. Further, the number of parts (parts by weight) indicates the number of parts of each component described.

(Preparation Example 1 of Acrylic Polymer)

Dicyclopentanyl methacrylate (DCPMA): 60 parts by weight, methyl methacrylate (MMA): 40 parts by weight, α-thioglycerol as a chain transfer agent: 3.5 parts by weight, and Toluene as a polymerization solvent: 100 parts by weight was placed in a four-necked flask, and the mixture was stirred at 70 ° C for 1 hour under a nitrogen atmosphere. Next, 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator was placed in a four-necked flask, and the mixture was reacted at 70 ° C for 2 hours, followed by a reaction at 80 ° C for 2 hours. Thereafter, the reaction liquid is placed in a temperature environment of 130 ° C, and toluene, a chain transfer agent, and an unreacted monomer are dried and removed to obtain a solid acrylic polymer (sometimes referred to as "acrylic polymer (A)" ). Further, the acrylic polymer (A) had a weight average molecular weight of 5,100.

(Example 1)

2-ethylhexyl acrylate (2EHA): 67 parts by weight, N-vinyl-2-pyrrolidine Ketone (NVP): 15 parts by weight, 2-hydroxyethyl acrylate (HEA): 18 parts by weight of a monomer mixture prepared by mixing a photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF Corporation): 0.035 by weight And a photopolymerization initiator (trade name "Irgacure 184", manufactured by BASF): 0.035 parts by weight, and then irradiated with ultraviolet rays until the viscosity (BH viscosity meter No. 5 rotor, 10 rpm, measurement temperature 30 ° C) becomes about 20 Pa‧ From s, a prepolymer composition obtained by partially polymerizing one of the above monomer components is obtained.

The acrylic polymer (A) was added and mixed in the prepolymer composition: 5 parts by weight, hexanediol diacrylate (HDDA): 0.075 parts by weight, and a decane coupling agent (trade name "KBM-403", (manufactured by Shin-Etsu Chemical Co., Ltd.): 0.3 parts by weight to obtain an acrylic pressure-sensitive adhesive composition.

The acrylic pressure-sensitive adhesive composition was applied onto a polyethylene terephthalate (PET) release liner (manufactured by Nitto Denko Corporation, thickness: 125 μm) to form an adhesive composition layer. Next, a PET-based release liner (manufactured by Nitto Denko Corporation, thickness: 125 μm) was placed on the pressure-sensitive adhesive composition layer, and the pressure-sensitive adhesive composition layer was coated to block oxygen. Further, a laminate (layered product (I)) having a structure of [release liner/adhesive composition layer/release liner] was obtained.

Then, the above-mentioned laminated body (I) was irradiated with ultraviolet light having an illuminance of 3 mW/cm ^{2 for} 300 seconds from the upper surface (release liner side) of the laminated body (I) by a black light lamp (manufactured by Toshiba Co., Ltd.). Further, the drying process was carried out for 2 minutes in a dryer at 90 ° C to volatilize the remaining monomers, and a double layer having a structure of a release liner/adhesive layer/release liner formed by a release liner to protect the adhesive faces on both sides was produced. Adhesive sheet (adhesive sheet without substrate). The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 50 μm.

(Example 2)

A double-sided adhesive sheet (adhesive sheet without a substrate) was produced in the same manner as in Example 1 except that the thickness of the adhesive layer was set to 100 μm. The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 100 μm.

(Example 3)

2-ethylhexyl acrylate (2EHA): 40.5 parts by weight, isostearyl acrylate (ISTA): 40.5 parts by weight, N-vinyl-2-pyrrolidone (NVP): 18 parts by weight, acrylic acid 4 - Hydroxybutyl ester (4HBA): 1 part by weight of a monomer mixture of a photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF Corporation): 0.05 part by weight and a photopolymerization initiator (trade name " Irgacure 184", manufactured by BASF Corporation): After 0.5 parts by weight, the ultraviolet ray is irradiated until the viscosity (BH viscosity meter No. 5 rotor, 10 rpm, measurement temperature: 30 ° C) is about 20 Pa s, and one of the above monomer components is partially polymerized. A prepolymer composition.

Trimethylolpropane triacrylate (TMPTA) was added and mixed in the above prepolymer composition: 0.02 parts by weight and a decane coupling agent (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.): 0.3 weight An acrylic adhesive composition was obtained in portions.

A double-sided adhesive sheet having a release liner and an adhesive surface on both sides of the release liner was prepared in the same manner as in Example 1 in the same manner as in Example 1 using the above-mentioned acrylic adhesive composition ( Adhesive sheet without substrate). The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 50 μm.

(Example 4)

A double-sided adhesive sheet (adhesive sheet without a substrate) was produced in the same manner as in Example 3 except that the thickness of the adhesive layer was set to 100 μm. The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 100 μm.

(Example 5)

2-ethylhexyl acrylate (2EHA): 40.5 parts by weight, isostearyl acrylate (ISTA): 40.5 parts by weight, N-vinyl-2-pyrrolidone (NVP): 18 parts by weight, acrylic acid 4 - Hydroxybutyl ester (4HBA): 1 part by weight of a monomer mixture of a photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF Corporation): 0.05 part by weight and a photopolymerization initiator (trade name " Irgacure 184", manufactured by BASF Corporation): After 0.5 parts by weight, the ultraviolet ray is irradiated until the viscosity (BH viscosity meter No. 5 rotor, 10 rpm, measurement temperature 30 ° C) becomes about 20 From the standpoint of Pa‧s, a prepolymer composition obtained by partially polymerizing one of the above monomer components is obtained.

To the above prepolymer composition, trimethylolpropane triacrylate (TMPTA) was added and mixed: 0.15 parts by weight, a decane coupling agent (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.): 0.3 weight A part of the α-thioglycerol as a chain transfer agent: 0.15 part by weight to obtain an acrylic pressure-sensitive adhesive composition.

A double-sided adhesive sheet having a release liner and an adhesive surface on both sides of the release liner was prepared in the same manner as in Example 1 in the same manner as in Example 1 using the above-mentioned acrylic adhesive composition ( Adhesive sheet without substrate). The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 50 μm.

(Example 6)

A double-sided adhesive sheet (adhesive sheet without a substrate) was produced in the same manner as in Example 5 except that the thickness of the adhesive layer was set to 100 μm. The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 100 μm.

(Example 7)

2-ethylhexyl acrylate (2EHA): 28.5 parts by weight, isostearyl acrylate (ISTA): 28.5 parts by weight, acrylic acid Ester (IBXA): 22 parts by weight of 4-hydroxybutyl acrylate (4HBA): 21 parts by weight of a monomer mixture prepared by mixing a photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF): 0.05 weight And a photopolymerization initiator (trade name "Irgacure 184", manufactured by BASF Corporation): 0.5 parts by weight, and then irradiated with ultraviolet rays until the viscosity (BH viscosity meter No. 5 rotor, 10 rpm, measurement temperature 30 ° C) is about 20 Pa‧s Thus, a prepolymer composition obtained by partially polymerizing one of the above monomer components is obtained.

To the above prepolymer composition, 1,6-hexanediol diacrylate (trade name "NK ester A-HD-N", manufactured by Shin-Nakamura Chemical Co., Ltd.) was added and mixed: 0.3 part by weight, decane Mixture (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.): 0.3 parts by weight of a photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF Corporation): 0.05 part by weight and a photopolymerization initiator (trade name "Irgacure 819", BASF Corporation Manufactured): 0.5 part by weight to obtain an acrylic pressure-sensitive adhesive composition.

A double-sided adhesive sheet having a release liner and an adhesive surface on both sides of the release liner was prepared in the same manner as in Example 1 in the same manner as in Example 1 using the above-mentioned acrylic adhesive composition ( Adhesive sheet without substrate). The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 50 μm.

(Example 8)

A double-sided adhesive sheet (adhesive sheet without a substrate) was produced in the same manner as in Example 7 except that the thickness of the adhesive layer was set to 100 μm. The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 100 μm.

(Example 9)

2-ethylhexyl acrylate (2EHA) as a monomer component: 63 parts by weight, methyl methacrylate (MMA): 9 parts by weight, N-vinyl-2-pyrrolidone (NVP): 15 weight A portion, 13 parts by weight of ethyl hydroxyethyl acrylate (HEA), and 175 parts by weight of ethyl acetate as a polymerization solvent were placed in a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After removing oxygen in the polymerization system in this manner, 2,2'-azobisisobutyronitrile as a polymerization initiator was added: 0.2 part by weight, and the temperature was raised to 63 ° C and reacted for 10 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer solution having a solid concentration of 36% by weight. Further, the acrylic polymer in the acrylic polymer solution had a weight average molecular weight of 850,000.

An isocyanate-based crosslinking agent (trade name "Takenate D-110N", manufactured by Mitsui Chemicals, Inc.) was added and mixed with the above-mentioned acrylic polymer solution: 1.1 parts by weight of a decane coupling agent (trade name "KBM-403", (manufactured by Shin-Etsu Chemical Co., Ltd.): 0.15 parts by weight and an ultraviolet absorber (trade name "TINUVIN 384-2", manufactured by BASF Corporation): 1.5 parts by weight to obtain an acrylic pressure-sensitive adhesive composition.

The acrylic pressure-sensitive adhesive composition was applied to a polyethylene terephthalate (PET) release liner (manufactured by Nitto Denko Corporation, thickness: 125 μm) to obtain adhesion. Agent composition layer. Next, it was heat-dried at 130 ° C for 3 minutes to form an adhesive layer. Next, a PET release liner (manufactured by Nitto Denko Corporation, thickness: 125 μm) was placed on the pressure-sensitive adhesive layer, and aged at 23 ° C for 120 hours to prepare a release liner/adhesive layer/release liner. A double-sided adhesive sheet (adhesive sheet without a substrate) in which the release liner protects the adhesive faces on both sides. The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 50 μm.

(Embodiment 10)

A double-sided adhesive sheet (adhesive sheet without a substrate) was produced in the same manner as in Example 9 except that the thickness of the adhesive layer was set to 100 μm. The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 100 μm.

(Example 11)

2-ethylhexyl acrylate (2EHA) as a monomer component: 63 parts by weight, methyl methacrylate (MMA): 9 parts by weight, N-vinyl-2-pyrrolidone (NVP): 15 weight A portion, 13 parts by weight of ethyl hydroxyethyl acrylate (HEA), and 175 parts by weight of ethyl acetate as a polymerization solvent were placed in a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After removing oxygen in the polymerization system in this manner, 2,2'-azobisisobutyronitrile as a polymerization initiator was added: 0.2 part by weight, and the temperature was raised to 63 ° C and reacted for 10 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer solution having a solid concentration of 36% by weight. Further, the acrylic polymer in the acrylic polymer solution had a weight average molecular weight of 850,000.

An isocyanate-based crosslinking agent (trade name "Takenate D-110N", manufactured by Mitsui Chemicals, Inc.) was added and mixed with the above-mentioned acrylic polymer solution: 1.1 parts by weight of a decane coupling agent (trade name "KBM-403", (manufactured by Shin-Etsu Chemical Co., Ltd.): 0.15 parts by weight and an ultraviolet absorber (trade name "KEMISORB 111", manufactured by Chemipro Chemical Co., Ltd.): 1 part by weight to obtain an acrylic pressure-sensitive adhesive composition.

A double-sided adhesive sheet having a release liner and an adhesive surface on both sides of the release liner was prepared in the same manner as in Example 9 in the same manner as in Example 9 using the above-mentioned acrylic adhesive composition ( Adhesive sheet without substrate). The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 50 μm.

(Comparative Example 1)

From n-butyl acrylate (BA): 67 parts by weight, cyclohexyl acrylate (CHA): 17 parts by weight, 2-hydroxyethyl acrylate (HEA): 8 parts by weight, 4-hydroxybutyl acrylate (4HBA): A photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF Corporation): 0.05 parts by weight and a photopolymerization initiator (trade name "Irgacure 184", manufactured by BASF Corporation) was added to a monomer mixture of 27 parts by weight. After 0.05 parts by weight, the ultraviolet ray was irradiated until the viscosity (BH viscosity meter No. 5 rotor, 10 rpm, measurement temperature: 30 ° C) was about 20 Pa s, and a prepolymer composition obtained by partially polymerizing one of the above monomer components was obtained.

To the above prepolymer composition, dipentaerythritol hexaacrylate (DPHA) was added and mixed: 0.1 part by weight and a decane coupling agent (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.): 0.3 parts by weight. Acrylic adhesive composition.

A double-sided adhesive sheet having a release liner and an adhesive surface on both sides of the release liner was prepared in the same manner as in Example 1 in the same manner as in Example 1 using the above-mentioned acrylic adhesive composition ( Adhesive sheet without substrate). The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 50 μm.

(Comparative Example 2)

A double-sided adhesive sheet (adhesive sheet without a substrate) was produced in the same manner as in Comparative Example 1, except that the thickness of the adhesive layer was set to 100 μm. The thickness of the double-sided adhesive sheet (the thickness of the release liner removed) was 100 μm.

(Evaluation)

The double-sided adhesive sheets obtained in the examples and the comparative examples were subjected to the following evaluations. The results are shown in Table 1.

(1) Extraction of acrylic acid ions

(production of test piece)

The double-sided adhesive sheet obtained in the examples and the comparative examples was cut into a sheet having a width of 10 cm × a length of 10 cm. The release liner was peeled off, and a PET film ("Lumirror S10" manufactured by Toray Industries, Inc., thickness: 25 μm) was attached to the adhesive surface on one side to prepare a test piece in which only one side of the adhesive surface was exposed. In addition, the mass of the adhesive layer in the test piece was 0.5 g when the thickness of the adhesive layer was 50 μm, and 1 g when the thickness was 100 μm. Further, the PET film was subjected to heat extraction (120 ° C × 1 hour) and further washed with pure water. In the present specification, the term "heat extraction" means that any component is extracted by being placed in pure water for a specific period of time while being heated to a specific temperature. For example, "heat extraction (120 ° C × 1 hour)" means that any component is extracted by being placed in pure water and left to stand at 120 ° C for 1 hour.

(heated extraction of acrylic acid ions)

Next, the test piece was placed in pure water (50 ml), and subjected to heat extraction (100 ° C × 45 minutes) by a dryer to obtain an extract.

Next, the amount of the acrylate ion (unit: μg) in the extract obtained above was measured by ion chromatography (Ion Chromatography), and the amount of the acrylate ion per 1 g of the adhesive layer in the test piece was calculated ( The amount of acrylic acid ions was extracted (unit: μg/g), and the results are shown in Table 1.

[Measurement conditions of ion chromatography]

Analytical device: manufactured by Thermo Fisher Scientific, ICS-3000

Separation column: Ion Pac AS18 (4mm × 250mm)

Protection column: Ion Pac AG18 (4mm × 50mm)

Removal system: AERS-500 (External Mode)

Detector: Conductivity detector

Dissolved solution: aqueous KOH solution

(Using the eluent generator EGIII)

Dissolution flow: 1.0ml/min

Sample injection amount: 250μl

(2) UV resistance

(Synthesis of silver nanowires and preparation of silver nanowire dispersion)

In a reaction vessel equipped with a stirring device, anhydrous ethylene glycol: 5 ml of PtCl ₂ anhydrous ethylene glycol solution (concentration: 1.5 × 10 ^-4 mol/l): 0.5 ml was added at 160 °C. After 4 minutes, an anhydrous glycol solution of AgNO ₃ (concentration: 0.12 mol/l) was added dropwise to the obtained solution over 6 minutes: 2.5 ml and anhydrous polyvinylpyrrolidone (Mw: 55000). Ethylene glycol solution (concentration: 0.36 mol/l): 5 ml. After the dropwise addition, the mixture was heated to 160 ° C and reacted for 1 hour or more until AgNO _{3 was} completely reduced to form a crude silver nanowire. Next, in the reaction mixture containing the crude silver nanowire obtained in the above manner, acetone was added until the volume of the reaction mixture became 5 times, and then the reaction mixture was centrifuged (2000 rpm, 20 minutes) to obtain silver lin. Rice noodles.

The silver nanowire obtained has a short diameter of 30 nm to 40 nm, a long diameter of 30 nm to 50 nm, and a length of 30 μm to 50 μm.

The silver nanowires: 0.2 parts by weight and pentaethylene glycol lauryl ether: 0.1 parts by weight were dispersed in pure water with respect to 100 parts by weight of water to prepare a silver nanowire dispersion.

(Preparation of a composition for forming a protective layer)

As a solvent, isopropyl alcohol (manufactured by Wako Pure Chemical Industries, Ltd.) and diacetone alcohol (manufactured by Wako Pure Chemical Industries, Ltd.) were mixed at a weight ratio of 1:1. In this solvent, dipentaerythritol hexaacrylate (DPHA) (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "A-DPH") was added to 100 parts by weight of the solvent: 3.0 parts by weight and a photopolymerization initiator. (trade name "Irgacure 907", manufactured by BASF Corporation): 0.09 parts by weight, a composition for forming a protective layer was prepared.

(Production of transparent conductive film (1))

As a transparent substrate, use drop An olefin-cyclohexane type cyclic olefin film (trade name "ZEONOR", manufactured by Nippon Zeon Co., Ltd., in-plane retardation Re: 1.7 nm, phase difference Rth in the thickness direction: 1.8 nm).

The silver nanowire dispersion was applied to the entire surface of the transparent substrate by a bar coater (trade name "Bar coater No. 20", manufactured by First Science Co., Ltd.). The inside of the air dryer at 120 ° C was dried for 2 minutes to form a silver nanowire layer. Thereafter, the composition for forming a protective layer was applied onto the entire surface of the silver nanowire layer by a slit mold at a Wet film thickness of 4 μm, and dried in a blow dryer at 120 ° C for 2 minutes. Then, ultraviolet light having an illuminance of 400 mJ/cm ^{2 was} irradiated by an ultraviolet irradiation device (manufactured by Fusion UV Systems Co., Ltd.) having an oxygen concentration of 100 ppm, and the protective layer-forming composition was cured to form a protective layer, thereby obtaining a transparent conductive film (1). ) [Transparent substrate / transparent conductive layer (including silver nanowire layer and protective layer)].

The transparent conductive film (1) had a surface resistance value of 50 Ω/□, a total light transmittance of 91.4%, and a haze of 2.0%.

(Measurement of resistance value)

The release liner was peeled off from the double-sided adhesive sheets obtained in the examples and the comparative examples, and the transparent conductive layer of the transparent conductive film (1) was bonded to the adhesive surface on one side (the silver nanowire layer formation side) A laminated body was obtained by laminating a glass plate (trade name "MICRO SLIDE GLASS S200200", manufactured by Matsuron Glass Industrial Co., Ltd., size: 50 mm × 45 mm, thickness: 1.2 to 1.5 mm) on the other adhesive surface. Next, the transparent conductive film (1) and the double-sided adhesive sheet exposed from the size of the glass plate were cut off to obtain a test piece as shown in Figs. 3 and 4 (size: 50 mm × 45 mm). .

The resistance value of the above test piece was 50 Ω/□, and this was set to "resistance value immediately after attachment". Next, using a Super Xenon Weather Meter SX75 (manufactured by Suga Test Instruments Co., Ltd.) in an environment of temperature: 45 ° C, humidity: 50% RH, the illuminance is 65 W/m ² , and the glass plate side of the test piece is irradiated with ultraviolet rays. The test piece was placed for 100 hours. The resistance value of the test piece placed after the above 100 hours was measured, and this was set as "resistance value after 100 hours of UV irradiation." Further, the ratio of the "resistance value after 100 hours of UV irradiation" to the "resistance value immediately after attachment" is measured [(resistance value after 100 hours of UV irradiation) / (resistance value immediately after attachment)] This is shown in Table 1 as the resistance value increase rate (times). The lower the display resistance value rise rate, the better the UV resistance. In addition, "resistance value immediately after attachment" and "resistance value after 100 hours of UV irradiation" were measured using "EC-80" manufactured by Napson Co., Ltd.

As a summary of the above, the constitution and variations of the present invention are enumerated below as a remark.

(Note 1)

An optical adhesive sheet for a silver nanowire layer, characterized in that it is an adhesive sheet having an adhesive layer, and is determined by ion chromatography using pure water at 100 ° C for 45 minutes from the above The amount of the acrylate ion extracted by the adhesive layer is 5 μg/g or less per 1 g of the above adhesive layer.

(Note 2)

The optical adhesive sheet of claim 1, wherein the adhesive layer is an acrylic adhesive layer containing an acrylic polymer.

(Note 3)

The optical adhesive sheet of claim 1 or 2, wherein the adhesive layer comprises an ultraviolet absorber.

(Note 4)

The optical adhesive sheet according to the third aspect, wherein the ultraviolet absorbing agent has an absorbance A obtained by the following method of 0.5 or less.

Absorbance A: Absorbance measured by irradiating a light having a wavelength of 400 nm to a 0.08% toluene solution of the above ultraviolet absorber

(Note 5)

The optical adhesive sheet according to Note 3 or 4, wherein the ultraviolet absorber is selected from the group consisting of a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and a hydroxyphenyl group. It is at least one ultraviolet absorber selected from the group consisting of ultraviolet absorbers.

(Note 6)

The optical adhesive sheet according to any one of claims 3 to 5, wherein the adhesive layer contains 0.01 to 10 parts by weight of the ultraviolet absorber with respect to 100 parts by weight of the base polymer in the adhesive layer.

(Note 7)

The optical adhesive sheet according to any one of claims 2 to 6, wherein the acrylic polymer does not substantially contain an acid group-containing monomer as a monomer component constituting the polymer.

(Note 8)

The optical adhesive sheet according to any one of the items 2 to 7, wherein a ratio of a monomer having a glass transition temperature of 20 ° C or higher in forming a homopolymer to 100% by weight of all monomer components constituting the acrylic polymer It is 1 to 50% by weight.

(Note 9)

The optical adhesive sheet according to any one of claims 2 to 8, wherein the acrylic polymer comprises a monomer containing a nitrogen atom and a monomer having a hydroxyl group as a structural unit.

(Note 10)

The optical adhesive sheet according to any one of claims 2 to 9, wherein the acrylic polymer is composed of a monomer mixture comprising a carbon number of 4 to 18 50 to 90% by weight of a linear or branched alkyl (meth) acrylate, one or more monomers selected from the group consisting of a monomer containing a nitrogen atom and a monomer having a hydroxyl group ~50% by weight, the monomer having an alicyclic structure having a carbon number of 6-10 is 0-40% by weight.

(Note 11)

The optical adhesive sheet according to any one of claims 2 to 10, wherein the acrylic polymer is composed of a monomer mixture comprising a linear or branched alkyl group having a carbon number of 4 to 18. 50 to 90% by weight of alkyl (meth)acrylate, 3 to 30% by weight of a monomer containing a nitrogen atom, 0.8 to 25% by weight of a monomer having a hydroxyl group, and an alicyclic structure having a carbon number of 6 to 10. The monomer is 0 to 40% by weight, and the ratio of the monomer containing a nitrogen atom and the monomer having a hydroxyl group is 10 to 50% by weight.

(Note 12)

The optical adhesive sheet according to any one of the items 2 to 11, wherein the content of the decane coupling agent in the acrylic pressure-sensitive adhesive layer is 0.01 to 1 part by weight based on 100 parts by weight of the acrylic polymer.

(Note 13)

The optical adhesive sheet according to any one of claims 2 to 12, wherein the acrylic pressure-sensitive adhesive layer is a solvent-based acrylic pressure-sensitive adhesive layer, and comprises 50% by weight of an acrylic polymer based on 100% by weight of the total weight of the adhesive layer. In the above, the ultraviolet absorber is contained in an amount of 0.05 to 9 parts by weight based on 100 parts by weight of the acrylic polymer.

(Note 14)

The optical adhesive sheet according to any one of claims 1 to 13, wherein the adhesive layer has a haze of 5% or less.

(Note 15)

The optical adhesive sheet according to any one of claims 1 to 14, wherein the adhesive layer has a total light transmittance of 85% or more.

(Note 16)

The optical adhesive sheet according to any one of claims 1 to 15, wherein the electric resistance value attached to the optical member having the silver nanowire layer and irradiated with ultraviolet rays for 100 hours is attached to the layer having the silver nanowire layer The ratio of the resistance value after the optical member is 3 times or less.

(Note 17)

The optical adhesive sheet according to any one of claims 1 to 16, which is for use in a film sensor.

1‧‧‧Optical products

11‧‧‧ Cover

12‧‧‧Optical adhesive sheet of the invention

13‧‧‧Substrate

14‧‧‧ Silver Nanolayer

15‧‧‧Protective layer

Claims (17)

An optical adhesive sheet for a silver nanowire layer, characterized in that it is an adhesive sheet having an adhesive layer, and is determined by ion chromatography using pure water at 100 ° C for 45 minutes. The amount of the acrylate ion extracted by the adhesive layer is 5 μg/g or less per 1 g of the above adhesive layer. The optical adhesive sheet according to claim 1, wherein the adhesive layer is an acrylic adhesive layer containing an acrylic polymer. The optical adhesive sheet of claim 1 or 2, wherein the adhesive layer comprises an ultraviolet absorber. The optical adhesive sheet according to claim 3, wherein the ultraviolet absorbing agent has an absorbance A of 0.5 or less in the following manner, and an absorbance A: an absorbance measured by irradiating a light having a wavelength of 400 nm with a 0.08% toluene solution of the ultraviolet absorbing agent. . The optical adhesive sheet according to claim 3, wherein the ultraviolet absorber is selected from the group consisting of a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and a hydroxyphenyl group. It is at least one ultraviolet absorber selected from the group consisting of ultraviolet absorbers. The optical adhesive sheet according to claim 3, wherein the adhesive layer contains 0.01 to 10 parts by weight of the ultraviolet absorber with respect to 100 parts by weight of the base polymer in the adhesive layer. The optical adhesive sheet according to claim 2, wherein the acrylic polymer does not substantially contain an acid group-containing monomer as a monomer component constituting the polymer. The optical adhesive sheet according to claim 2, wherein the ratio of the monomer having a glass transition temperature of 20 ° C or more when the homopolymer is formed is 100% by weight of the monomer component of the acrylic polymer, and the ratio of the monomer is 1 to 50 by weight. %. The optical adhesive sheet of claim 2, wherein the acrylic polymer comprises nitrogen The monomer of the atom and the monomer having a hydroxyl group are used as a structural unit. The optical adhesive sheet according to claim 2, wherein the acrylic polymer is composed of a monomer mixture comprising a (methyl) group having a linear or branched alkyl group having 4 to 18 carbon atoms. 50 to 90% by weight of an alkyl acrylate, 10 to 50% by weight of one or more monomers selected from the group consisting of a monomer containing a nitrogen atom and a monomer having a hydroxyl group, and a carbon number of 6 to 10 The monomer of the alicyclic structure is 0 to 40% by weight. The optical adhesive sheet according to claim 2, wherein the acrylic polymer is composed of a monomer mixture comprising a (methyl) group having a linear or branched alkyl group having 4 to 18 carbon atoms. 50 to 90% by weight of an alkyl acrylate, 3 to 30% by weight of a monomer containing a nitrogen atom, 0.8 to 25% by weight of a monomer having a hydroxyl group, and a monomer having an alicyclic structure having a carbon number of 6 to 10 40% by weight, and the total ratio of the monomer containing a nitrogen atom and the monomer containing a hydroxyl group is 10 to 50% by weight. The optical adhesive sheet according to claim 2, wherein the content of the decane coupling agent in the acrylic pressure-sensitive adhesive layer is 0.01 to 1 part by weight based on 100 parts by weight of the acrylic polymer. The optical adhesive sheet according to claim 2, wherein the acrylic pressure-sensitive adhesive layer is a solvent-based acrylic pressure-sensitive adhesive layer, and the acrylic polymer is contained in an amount of 50% by weight or more based on 100% by weight based on the total weight of the pressure-sensitive adhesive layer, relative to acrylic acid. 100 parts by weight of the polymer contains 0.05 to 9 parts by weight of the ultraviolet absorber. The optical adhesive sheet according to claim 1 or 2, wherein the adhesive layer has a haze of 5% or less. The optical adhesive sheet according to claim 1 or 2, wherein the adhesive layer has a total light transmittance of 85% or more. The optical adhesive sheet according to claim 1 or 2, wherein the electric resistance member attached to the optical member having the silver nanowire layer and irradiated with ultraviolet rays for 100 hours is opposite to the optical member immediately after being attached to the silver nanowire layer The ratio of the resistance values is 3 times or less. An optical adhesive sheet according to claim 1 or 2, which is used for a film sensor.