TW201443181A - Pressure-sensitive adhesive layer for optical use, pressure-sensitive adhesive sheet, optical component and touch panel - Google Patents

Abstract

Provided are an optical component capable of suppressing the occurrence of undulations, having an excellent corrosion inhibition effect while maintaining a high level of adhesion reliability and transparency, as well as a pressure-sensitive adhesive layer and a pressure-sensitive adhesive sheet that can produce such an optical component efficiently and at a low cost. The present invention provides an optical pressure-sensitive adhesive layer comprising a base polymer and a rust inhibitor, characterized in that the base polymer does not or substantially does not contain an acid group-containing monomer as a constituent monomer component, and that an 85 DEG C. modulus of elasticity is not less than 5.0x104 Pa.

Description

Optical adhesive layer, adhesive sheet, optical member and touch panel

The present invention relates to an adhesive layer for optics, an adhesive sheet, an optical member, and a touch panel.

In recent years, display devices such as liquid crystal displays (LCDs) or input devices such as touch panels have been widely used in various fields. In the manufacture of such display devices or input devices, the adhesive sheet is used for the purpose of bonding optical members. For example, a bonding of optical members in various display devices such as a touch panel uses a transparent adhesive sheet.

In such display devices or input devices, water, acid gas, salt water, and corrosive components intrude into the interior from the external environment, causing corrosion of the metal wiring. With the increase in size or narrow margin of sensors in recent years, there have been many cases in which copper wiring is provided. Copper is known to have excellent electrical conductivity second only to silver, and is useful as a material for wiring, but is easily oxidized and corroded. In general, in order to prevent oxidation and corrosion of the metal, a method of preventing moisture or corroding components from entering by applying a moisture-proof protective layer to the metal wiring is used (Patent Document 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-28594

However, the above-described coating must be carried out after the application of the metal wiring, and it is a problem that the manufacturing yield is lowered and the cost is large in terms of time-consuming and laborious steps. In the case of using a moisture-proof protective layer, it is possible to ensure adhesion and foam peeling resistance (it is difficult to cause foaming or peeling at the interface between the adhesive sheet and the adherend in a high-temperature environment). Then there are problems in terms of reliability and transparency.

Further, when a pattern is applied to the metal film on the laminate in which the metal film is laminated on the support, a portion (pattern formation portion) to which the pattern is applied and a portion where the pattern is not applied (pattern opening portion) are generated. When such a metal film pattern is applied, the laminate may fluctuate in a high temperature environment due to a difference in linear expansion ratio between the material constituting the support and the metal constituting the metal film. Further, if the above-described undulation occurs, the problem of deterioration in appearance tends to occur. This is because the step of the boundary between the pattern forming portion and the pattern opening portion (hereinafter sometimes referred to as "pattern boundary") becomes larger than necessary, and the pattern boundary is easily recognized.

Accordingly, an object of the present invention is to provide a method for suppressing occurrence of undulations in a high-temperature environment, and to maintain high adhesion and foam peeling resistance (it is difficult to cause foaming or peeling at the interface between the adhesive sheet and the adherend in a high temperature environment). An optical member (especially an optical member to which an adhesive sheet is attached) having excellent corrosion resistance of metal wiring such as copper wiring, and the like, and the like, and the optical member can be manufactured at a low cost and at low cost. Optical adhesive layer and adhesive sheet.

Therefore, the inventors of the present invention have made an effort to solve the above problems, and as a result, it has been found that by using a suitable base polymer constituting the adhesive layer and using a rust preventive agent, it is possible to provide reliability, transparency, and corrosion resistance. Further, if the modulus of elasticity of the adhesive composition at a high temperature is controlled, the occurrence of undulations in a high-temperature environment can be suppressed, and the present invention can be completed.

In particular, it has been found that the present invention can be obtained by using a monomer which does not contain or substantially contains an acidic group as a monomer component constituting the base polymer and using a rust preventive agent in synergy with the anticorrosive effect.

That is, the present invention provides an optical adhesive layer comprising a base polymer and a rust preventive agent, wherein the base polymer has no or substantially no acid group-containing monomer as a monomer component of the composition. The modulus of elasticity at 85 ° C is 5.0 × 10 ⁴ Pa or more.

Furthermore, the present invention provides an optical adhesive layer containing an acrylic polymer (A) as a main component and a rust preventive agent, and the acrylic polymer (A) does not contain or constitute a monomer component. The monomer having no carboxyl group is substantially not contained, and the modulus of elasticity at 85 ° C is 5.0 × 10 ⁴ Pa or more.

The optical pressure-sensitive adhesive layer preferably contains 5 parts by weight or more of the hydroxyl group-containing monomer based on the total amount of the monomer components (100 parts by weight) constituting the acrylic polymer (A).

The optical adhesive layer is preferably contained in an amount of 5 parts by weight or more based on the total amount of the monomer component (100 parts by weight) constituting the acrylic polymer (A).

The above rust inhibitor is preferably a benzotriazole compound.

The optical adhesive layer preferably has a haze (according to JIS K7136) of 1.0% or less.

The optical adhesive layer preferably has a total light transmittance (according to JIS K7361-1) of 90% or more.

Further, the present invention provides an adhesive sheet having the above-mentioned optical adhesive layer.

Preferably, the adhesive sheet has a 180° peeling adhesion force to the glass sheet of 8 N/20 mm or more.

The above adhesive sheet preferably has a thickness of 12 to 350 μm.

Furthermore, the present invention provides an optical member comprising at least the above-mentioned adhesive sheet and a substrate, wherein the substrate has metal wiring on at least one side, and the adhesive sheet is adhered to a surface of the substrate on the side having the metal wiring.

In the above optical member, the metal wiring is preferably a copper wiring.

Furthermore, the present invention provides a touch panel comprising at least the adhesive sheet and a substrate, wherein the substrate has metal wiring on at least one side, and the adhesive sheet is adhered to a surface of the substrate having the metal wiring side. .

In the above touch panel, the metal wiring is preferably a copper wiring.

According to the adhesive layer for optics of the present invention, it is possible to provide reliability, transparency, and anti-corrosion effect. Therefore, it is possible to obtain high reliability and transparency such as adhesion and foam peeling resistance, and metal wiring such as copper wiring. An optical member excellent in corrosion resistance and an adhesive layer and an adhesive sheet which can realize the manufacture of such an optical member. Further, by imparting corrosion resistance to the adhesive layer, the step can be reduced without applying a protective layer, so that the cost is lowered and the yield is improved.

Further, according to the optical adhesive layer of the present invention, it is possible to suppress the occurrence of undulations in a high-temperature environment, and thus an optical member having a good appearance and an adhesive layer and an adhesive sheet which can realize the production of such an optical member can be obtained.

1, 4, 5‧ ‧ optical components

2‧‧‧ touch panel

3‧‧‧Metal wiring

6‧‧‧Layer

10, 10a, 10b, 10c‧‧‧ adhesive sheets

11‧‧‧Transparent conductive film

12, 12a, 12b‧‧‧ transparent substrate

13‧‧‧Film sensor

14a, 14b‧‧‧ polarizing plate

15‧‧‧hard coating

20‧‧‧Glass with grade difference (step test piece)

21‧‧‧ glass plate

22‧‧ ‧ step

61‧‧‧Support

62‧‧‧Metal film

71a, 72a, 73a, 74a, 75a, 76a‧‧‧ metal wiring (pattern wiring)

71b, 72b, 73b, 74b, 75b, 76b‧‧‧ metal wiring (pattern wiring)

81, 82, 83, 84, 85, 86‧‧‧ electrodes (transparent electrodes)

1(A) to (C) are schematic views showing specific examples of preferred aspects of the optical member of the present invention.

2(A) to (E) are schematic views showing a specific example of a preferred aspect of the touch panel of the present invention.

Fig. 3 is a plan view of the glass of the difference in the use of the foaming peel resistance evaluation.

Fig. 4 is a cross-sectional view (A-A' line sectional view) of the glass of the above-mentioned difference.

Fig. 5 is a cross-sectional view (B-B' line cross-sectional view) of the glass of the above-mentioned difference.

Fig. 6 is a schematic cross-sectional view showing an example of a laminate including a support and a metal film which is undulated.

Fig. 7 is a plan view showing an example of a metal wiring pattern.

[1. Optical adhesive layer]

The optical adhesive layer of the present invention contains a base polymer as a main component and a rust preventive agent, and the base polymer as a monomer component of the composition does not contain or substantially does not contain an acid group-containing monomer, at 85 ° C The elastic modulus is 5.0 × 10 ⁴ Pa or more, and is not particularly limited in other respects. Further, the adhesive composition of the present invention contains at least a base polymer and a rust preventive.

The optical adhesive layer of the present invention does not contain or substantially contains an acid group-containing monomer as a monomer component constituting the base polymer, and further contains a rust preventive agent, thereby obtaining an synergistic effect with the anticorrosive effect, and is excellent. Corrosion resistance.

Further, the optical adhesive layer of the present invention may contain an acrylic polymer (A) as a main component and a rust preventive agent, and the acrylic polymer (A) does not contain or substantially does not contain a carboxyl group-containing monomer. The monomer component is composed of a modulus of elasticity at 85 ° C of 5.0 × 10 ⁴ Pa or more.

The composition (adhesive composition, precursor composition) for forming the optical adhesive layer of the present invention may have any form, and examples thereof include a latex type, a solvent type, a hot melt type (hot melt type), and an active energy ray. Hardened type, etc. Further, in the present specification, the adhesive composition means a composition for forming an adhesive layer, and comprises a composition for forming an adhesive.

The base polymer to be contained in the optical adhesive layer of the present invention is not particularly limited, and examples thereof include an acrylic polymer as a base polymer and a rubber-based adhesive layer contained in the acrylic pressure-sensitive adhesive layer (natural a rubber-based polymer or a polyoxyn-based adhesive layer as a base polymer contained in a rubber-based adhesive layer or a synthetic rubber-based pressure-sensitive adhesive layer, which is a base polymer, and a polyfluorene-based polymer as a base polymer. A urethane-based polymer or a polyamine-based adhesive which is a base polymer contained in a polyester-based polymer or a urethane-based adhesive layer as a base polymer contained in the ester-based pressure-sensitive adhesive layer. The epoxy-based polymer or the vinyl alkyl ether-based adhesive layer as a base polymer contained in the polyamine polymer or the epoxy-based adhesive layer as the base polymer contained in the layer A fluorine-based polymer as a base polymer contained in the vinyl alkyl ether polymer of the base polymer or the fluorine-based pressure-sensitive adhesive layer. Among them, the base polymer is preferably an acrylic polymer in terms of transparency, weather resistance, reliability, and functional design of the adhesive layer easily due to a rich variety of monomers. That is, the optical adhesive layer of the present invention is preferably an acrylic pressure-sensitive adhesive layer containing the acrylic polymer (A) described below as a base polymer. Further, the base polymers may be used singly or in combination of two or more.

The content of the base polymer in the optical adhesive layer of the present invention is not particularly limited, but is preferably 75% by weight or more (for example, 75 to 99.9% by weight), more preferably 85% by weight or more (for example, 85 to 99.9 by weight). %).

The optical adhesive layer of the present invention does not contain or substantially contains an acid group-containing monomer (for example, a carboxyl group-containing monomer, a sulfo group-containing monomer, a phosphate group-containing monomer, or the like). Therefore, the corrosion resistance of the excellent metal wiring can be obtained. Further, the content of the acid group-containing monomer is preferably 0.05% by weight or less (e.g., 0 to 0.05% by weight), more preferably 0.01% by weight or less (e.g., 0 to 0.01) based on the optical adhesive layer of the present invention. The weight %), more preferably 0.001% by weight or less (for example, 0 to 0.001% by weight), may be referred to as substantially absent.

In the case where the optical adhesive layer of the present invention is an acrylic adhesive layer, the optical adhesive layer of the present invention does not contain or substantially does not contain a monomer having an acidic group such as a carboxyl group-containing monomer as a constitution. The monomer component of the acrylic polymer contained in the polymer. In the case where the acrylic polymer (A) is contained as the base polymer, the optical adhesive layer of the present invention preferably contains no or substantially no carboxyl group-containing monomer as the acrylic polymer (A). Monomer component. Therefore, the optical adhesive layer of the present invention can obtain an excellent anticorrosive effect. The meaning of the monomer having a carboxyl group, the meaning of "substantially not contained", and the monomer having an acidic group other than a carboxyl group are the same as those of the monomer component constituting the acrylic polymer (A). Further, the content of the carboxyl group-containing monomer is preferably 0.05% by weight or less (e.g., 0 to 0.05% by weight), more preferably 0.01% by weight or less (e.g., 0 to 0.01) based on the total amount of the optical adhesive layer of the present invention. % by weight, and further preferably 0.001 weight The amount of % or less (for example, 0 to 0.001% by weight) can be said to be substantially absent.

The optical adhesive layer of the present invention is transparent or transparent. Therefore, the optical adhesive layer of the present invention is excellent in visibility or appearance.

The haze of the optical adhesive layer of the present invention (according to JIS K7136) is not particularly limited, but is preferably 1.0% or less, more preferably 0.8% or less. When the haze is 1.0% or less, excellent transparency or an excellent appearance can be obtained, which is preferable. Further, regarding the haze, for example, an adhesive layer (thickness: 100 μm) can be prepared, and it is allowed to stand in a normal state (23° C., 50% RH (Relative Humidity)) for at least 24 hours, and then bonded thereto. For the slides (for example, the total light transmittance is 91.8%, and the haze is 0.4%), the obtained one is used as a sample by a haze meter (manufactured by Murakami Color Technology Research Co., Ltd., trade name "HM-150". ") Perform the measurement.

The total light transmittance (in accordance with JIS K7361-1) of the optical adhesive layer of the present invention in the visible light wavelength region is not particularly limited, but is preferably 85% or more, and more preferably 88% or more. When the total light transmittance is 85% or more, excellent transparency or an excellent appearance can be obtained, which is preferable. Further, regarding the total light transmittance, for example, an adhesive layer (thickness: 100 μm) can be prepared, and it is allowed to stand in a normal state (23° C., 50% RH) for at least 24 hours, and then, when it has a separator, The separator was peeled off, and the adhesive sheet was attached to a glass slide (for example, a total light transmittance of 91.8% and a haze of 0.4%), and the obtained one was used as a sample by a haze meter (Muramura color technology) The company's manufacturing company, product name "HM-150") was measured.

The optical adhesive layer of the present invention has an elastic modulus at 85 ° C of 5.0 × 10 ⁴ Pa or more, more preferably 7.0 × 10 ⁴ Pa or more, still more preferably 9.0 × 10 ⁴ Pa or more. Since the optical adhesive layer of the present invention has an elastic modulus at 85 ° C of 5.0 × 10 ⁴ Pa or more, generation of undulation can be suppressed. Therefore, according to the optical adhesive layer of the present invention, an optical member or a touch panel having a good appearance can be obtained. The reason for this is that it is possible to suppress the occurrence of a so-called "visible pattern" (a phenomenon in which the step difference of the pattern boundary becomes larger than necessary and the pattern boundary is easily recognized, and the appearance is deteriorated).

The above measurement of the modulus of elasticity at 85 ° C was carried out in the following manner. After making an adhesive layer (thickness: about 2 mm), it is punched out into 7.9 mm, cylindrical particles were produced as samples for measurement. Fix the above test sample to The temperature dependence of the storage elastic modulus G' was measured by a dynamic viscoelasticity measuring apparatus (manufactured by Rhcomctrics, ARES) on a jig of a 7.9 mm parallel plate. That is, the storage elastic modulus (G') at 85 ° C when the measurement was performed in the shear mode, the temperature range: -70 ° C to 150 ° C, the temperature increase rate: 5 ° C / min, and the frequency: 1 Hz.

Regarding the above-described undulations, a schematic cross-sectional view showing an example of a laminate including a support and a metal film (a laminate having a metal film pattern on a support) is shown in FIG. 6. In Fig. 6, 6 is a laminated body, 61 is a support, and 62 is a metal film (metal film pattern). Thus, the term "undulation" refers to fluctuations and fluctuations.

The method for producing the optical adhesive layer is not particularly limited. For example, it can be produced by producing the above-mentioned adhesive composition, and if necessary, irradiation with an active energy ray, heat drying, or the like. Specifically, a method of adding a rust preventive agent (for example, a benzotriazole-based compound, etc.), an additive, or the like as needed, and mixing the polymerizable monomer mixture or a partial polymer thereof, etc., may be mentioned. .

The optical adhesive layer of the present invention contains a rust preventive. The rust inhibitor contains a compound that prevents rust or corrosion of the metal. The rust inhibitor is not particularly limited, and examples thereof include an amine compound, a benzotriazole-based compound, and a nitrite. In addition, examples thereof include ammonium benzoate, ammonium phthalate, ammonium stearate, ammonium palmitate, ammonium oleate, ammonium carbonate, dicyclohexylamine benzoate, urea, and cyclohexamethylenetetramine. Amine, thiourea, phenyl carbamate, cyclohexylammonium N-cyclohexylcarbamate (CHC), and the like. Further, the rust inhibitor may be used singly or in combination of two or more.

Examples of the amine compound include a hydroxyl group-containing amine compound such as 2-amino-2-methyl-1-propanol, monoethanolamine, monoisopropanolamine, diethylethanolamine, ammonia or aqueous ammonia; A cyclic amine such as morpholine; a cyclic alkylamine compound such as cyclohexylamine; or a linear alkylamine such as 3-methoxypropylamine. Further, examples of the nitrites include dicyclohexylammonium nitrite (DICHAN), diisopropylammonium nitrite (DIPAN), sodium nitrite, potassium nitrite, and calcium nitrite.

Among them, in terms of the compatibility and transparency of the base polymer, in the case where the base polymer is reacted after the addition, it is difficult to suppress the reaction (crosslinking, polymerization, etc.) of the base polymer. The rust inhibitor is preferably a benzotriazole compound.

The content of the rust inhibitor is not particularly limited, and is preferably 0.02 to 15 parts by weight based on 100 parts by weight of the base polymer. When the content is 0.02 parts by weight or more, good corrosion resistance is easily obtained, which is preferable. On the other hand, when the content is less than 15 parts by weight, it is easy to ensure transparency, and it is easy to ensure the subsequent reliability such as foaming peeling resistance.

In particular, in terms of obtaining a property of reliability, transparency, and corrosion resistance with a better balance and a higher level, it is preferred that the above base polymer is an acrylic polymer (especially the following acrylic acid). The polymer (A)) and the above rust inhibitor are benzotriazole compounds. That is, the optical adhesive layer of the present invention preferably contains at least an acrylic polymer (especially the following acrylic polymer (A)) as a base polymer and a benzotriazole compound as a rust preventive agent. Acrylic adhesive layer.

[1-1. Benzotriazole-based compound]

The content of the benzotriazole-based compound is not particularly limited, and is preferably 0.02 to 3 parts by weight, more preferably 0.02 to 2.5, based on the total amount of the monomer component (100 parts by weight) constituting the acrylic polymer (A). The part by weight is further preferably 0.02 to 2 parts by weight. In other words, the optical adhesive layer of the present invention preferably contains 0.02 to 3 parts by weight, more preferably 0.02 to 2.5 parts by weight, based on 100 parts by weight of the acrylic polymer (A). It is preferably contained in an amount of 0.02 to 2 parts by weight. When the amount of the benzotriazole-based compound is too small, the value of the rate of change T of the sheet resistivity may not be set to a specific value. Also, due to the benzotriazole system Since the amount of the compound is not more than a certain value, it is possible to reliably ensure the subsequent reliability such as the foaming peeling resistance, and it is possible to surely prevent the increase in the haze of the pressure-sensitive adhesive layer or the pressure-sensitive adhesive sheet.

The benzotriazole-based compound is not particularly limited as long as it is a compound having a benzotriazole skeleton, and from the viewpoint of obtaining a more excellent anticorrosive effect, it is preferred to have the following formula (1). The structure of the representation.

(In the above formula (1), R ¹ and R ^{2 are the} same or different, and R ¹ is a substituent on the benzene ring, and represents an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, and carbon. 6 to 14 aryl, amine, mono or di C _1-10 alkylamino, amino-C _1-6 alkyl, mono or di C _1-10 alkylamino-C _1-6 alkane a substituent such as a group, a fluorenyl group or an alkoxycarbonyl group having 1 to 6 carbon atoms, and n is an integer of 0 to 4. When n is 2 or more, n of R ^{1 's} may be the same or different, and R ² represents a hydrogen atom. , an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryl group having 6 to 14 carbon atoms, an amine group, a mono or di C _1-10 alkylamino group, and an amine group -C _{1- 6} alkyl, mono or di C _1-10 alkylamino-C _1-6 alkyl, fluorenyl, alkoxycarbonyl group having 1 to 12 carbon atoms, etc.)

From the viewpoint of obtaining a more excellent anticorrosive effect, R ^{1 is} preferably an alkyl group having 1 to 3 carbon atoms, an alkoxycarbonyl group or the like, more preferably a methyl group or the like. Also, n is preferably 0 or 1.

From the same viewpoint, R ^{2 is} preferably a hydrogen atom, a mono or di C _1-10 alkylamino group-C _1-6 alkyl group, etc., more preferably a hydrogen atom or a di C _1-8 alkyl group. Amino C _1-4 alkyl group and the like.

[1-2. Acrylic Polymer (A)]

The optical adhesive layer of the present invention preferably has an acrylic polymer (A) as a main component. A layer of acrylic adhesive. The specific content of the acrylic polymer (A) is not particularly limited, and is preferably 75% by weight or more (for example, 75 to 99.9% by weight) based on the total amount of the optical adhesive layer (total weight, 100% by weight) of the present invention. More preferably, it is 85 weight% or more (for example, 85-99.9 weight%).

The adhesive composition for forming an optical adhesive layer containing the acrylic polymer (A) as a main component is not particularly limited, and examples thereof include a composition containing an acrylic polymer (A) as an essential component; A mixture of monomer components (sometimes referred to as "monomer mixture") constituting the acrylic polymer (A) or a partial polymer thereof as an essential component. The former is, for example, a solvent-based composition, and the like, and the latter is, for example, an active energy ray-curable composition. Further, the above adhesive composition may contain other additives as needed.

The above-mentioned "monomer mixture" includes a case where it is composed of a single monomer component and a case where it is composed of two or more monomer components. Moreover, the above-mentioned "partial polymer" means a composition in which one or two or more components of the constituent components of the monomer mixture are partially polymerized. Among them, the above adhesive composition is preferably a composition in which a monomer mixture or a partial polymer thereof is an essential component.

The acrylic polymer (A) is a polymer (Polymer) containing an acrylic monomer as a monomer unit (monomeric unit). In other words, the acrylic polymer (A) is a polymer containing a constituent unit derived from an acrylic monomer as a constituent unit. In other words, the acrylic polymer (A) is a polymer which is formed (formed) by using an acrylic monomer as an essential monomer component. In the present specification, the term "(meth)acrylic acid" means either or both of "acrylic acid" and "methacrylic acid", and the others are also the same. The weight average molecular weight of the acrylic polymer (A) is not particularly limited, but is preferably from 100,000 to 5,000,000.

The acrylic polymer (A) preferably contains an alkyl (meth)acrylate having a linear or branched alkyl group (hereinafter sometimes abbreviated as "alkyl (meth)acrylate") as a necessity. The polymer of the monomer unit.

Examples of the alkyl (meth)acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, and isopropyl (meth)acrylate. Butyl acrylate (n-butyl (meth)acrylate), isobutyl (meth)acrylate, second butyl (meth)acrylate, tert-butyl (meth)acrylate, (meth)acrylic acid Amyl ester, isoamyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, (A) Isooctyl acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate Ester, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, (methyl) Cetyl acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, isostearyl (meth) acrylate, pentadecyl (meth) acrylate Ethylene (meth) acrylate Etc. The alkyl group having 1 to 20 carbon atoms of (meth) acrylate and the like. Further, the alkyl (meth)acrylate may be used singly or in combination of two or more.

Among them, in terms of obtaining strong adhesion and adjusting residual stress, the alkyl (meth)acrylate is preferably an alkyl (meth)acrylate having an alkyl group having 1 to 18 carbon atoms. Preferably, it is methyl methacrylate (MMA), butyl acrylate (BA), 2-ethylhexyl acrylate (2EHA), isostearyl acrylate (ISTA).

The content (ratio) of the above (meth)acrylic acid alkyl ester in all the monomer units (the total amount of the monomer components constituting the acrylic polymer (A)) of the acrylic polymer (A) is not particularly limited, and The reliability, particularly the reliability in the low temperature, is preferably 30 to 95 parts by weight, based on the total amount of the monomer components (100 parts by weight) constituting the acrylic polymer (A). It is preferably from 35 to 90 parts by weight, more preferably from 40 to 85 parts by weight.

The acrylic polymer (A) may contain a copolymerizable monomer (copolymerizable monomer) in addition to the above (meth)acrylic acid alkyl ester as a monomer unit. That is, acrylic The polymer (A) may also contain a copolymerizable monomer as a monomer component of the composition. Further, the copolymerizable monomers may be used singly or in combination of two or more.

As the above-mentioned copolymerizable monomer, a hydroxyl group-containing monomer is preferable. When the acrylic polymer (A) contains a monomer having a hydroxyl group as a monomer unit, it is easy to polymerize when the monomer component of the composition is polymerized, and a good cohesive force is easily obtained. Therefore, it is easy to obtain strong adhesion, and the gel fraction is made large, and it is easy to obtain excellent foam peeling resistance. Further, it is easy to suppress whitening of the adhesive sheet which is generated in a high-humidity environment.

The content (ratio) of the hydroxyl group-containing monomer in the total amount (100 parts by weight) of the monomer component constituting the acrylic polymer (A) is not particularly limited. When the amount of the hydroxyl group-containing monomer is more than or equal to a fixed amount, it is possible to further suppress whitening of the adhesive sheet which is generated in a high-humidity environment, and to ensure transparency such as humidification resistance and turbidity. The lower limit of the content of the hydroxyl group-containing monomer is preferably 5 parts by weight or more, more preferably 7 parts by weight or more, still more preferably 10 parts by weight or more. In addition, the upper limit of the content of the hydroxyl group-containing monomer is preferably 40 parts by weight or less, and more preferably 35, in terms of cohesive force, adhesion, foaming resistance, and the like, and reliability. It is preferably 30 parts by weight or less, and more preferably 30 parts by weight or less.

Further, as the copolymerizable monomer, a monomer containing a nitrogen atom is preferably used. When the acrylic polymer (A) contains a monomer containing a nitrogen atom as a monomer unit, it is easy to obtain an appropriate cohesive force. Therefore, the 180-degree peeling adhesion force to the glass plate and the 180-degree peeling force with respect to the acrylic plate become large, and it is easy to obtain strong adhesion, and the gel fraction is increased, and it is easy to obtain excellent foam resistance. Peelability. Further, it is easy to obtain appropriate flexibility in the adhesive layer, and the 300% tensile residual stress is adjusted to a specific range, and it is easy to obtain excellent stress relaxation property and excellent step followability.

The content (ratio) of the nitrogen atom-containing monomer in the total amount (100 parts by weight) of the monomer component constituting the acrylic polymer (A) is not particularly limited, but is preferably 5 parts by weight or more. In terms of cohesive force, adhesion, and foaming resistance, the above-mentioned nitrogen atom-containing monomer is relative to the total amount (100 parts by weight) of the monomer component constituting the acrylic polymer (A). The lower limit of the content is more preferably 7 parts by weight or more, still more preferably 10 parts by weight or more. Further, the upper limit of the content of the nitrogen atom-containing monomer is preferably 40 in terms of the fact that the adhesive layer is more likely to obtain appropriate flexibility, and it is easier to obtain excellent stress relaxation and excellent step followability. The amount by weight or less is more preferably 35 parts by weight or less, still more preferably 30 parts by weight or less.

The acrylic polymer (A) can be obtained by polymerizing the above monomer unit (monomer component) by a known or conventional polymerization method. Examples of the polymerization method of the acrylic polymer (A) 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, water resistance, cost, and the like of the adhesive layer, a solution polymerization method and an active energy ray polymerization method are preferred, and an active energy ray polymerization method is more preferred.

Examples of the active energy ray to be irradiated during the active energy ray polymerization (photopolymerization) include ionizing radiation such as α rays, β rays, γ rays, neutron beams, 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 as long as the photopolymerization initiator can be activated to cause a reaction of the monomer component.

In the polymerization of the acrylic polymer (A), 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.

Further, in the polymerization of the acrylic polymer (A), 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. Further, the polymerization initiators may be used singly or in combination of two or more.

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, benzoin photopolymerization initiator, benzophenone photopolymerization initiator, ketal Photopolymerization initiator, 9-oxosulfur A photopolymerization initiator or the like. Further, the photopolymerization initiator may be used singly or in combination of two or more.

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-diphenyl. Alkyl-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-hydroxycyclohexylbenzene. Ketone, 4-phenoxydichloroacetophenone, 4-(t-butyl)dichloroacetophenone, and the like. Examples of the α-keto alcohol-based photopolymerization initiator include 2-methyl-2-hydroxypropiophenone and 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. Examples of the photoactive oxime-based photopolymerization initiator include 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-ruthenium. Examples of the benzoin-based photopolymerization initiator include benzoin and the like. Examples of the benzoin-based photopolymerization initiator include benzoin and the like. Examples of the benzophenone-based photopolymerization initiator include benzophenone, benzamidine benzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, and polyethylene diphenyl. Methyl ketone, α-hydroxycyclohexyl phenyl ketone, and the like. Examples of the ketal-based photopolymerization initiator include benzoin dimethyl ketal and 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.

The amount of the photopolymerization initiator to be used is not particularly limited. For example, it is 100 parts by weight based on 100 parts by weight of all the monomer units (the total amount of the monomer components constituting the acrylic polymer (A)) of the acrylic polymer (A). It is preferably 0.001 to 1 part by weight, more preferably 0.01 to 0.50 part by weight.

Further, the thermal polymerization initiator is not particularly limited, and examples thereof include azo. A polymerization initiator, a peroxide-based polymerization initiator (for example, benzamidine peroxide, tributyl methoxide peroxide), 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-based polymerization initiator include 2,2'-azobisisobutyronitrile (hereinafter sometimes referred to as "AIBN") and 2,2'-azobis-2-methylbutyronitrile (hereinafter referred to as "AIBN"). Hereinafter, it is sometimes referred to as "AMBN"), 2,2'-azobis(2-methylpropionic acid) dimethyl ester, 4,4'-azobis-4-cyanoshikimic acid or the like.

The amount of the above-mentioned thermal polymerization initiator is not particularly limited. For example, in the case of the above azo-based polymerization initiator, all the monomer units (constituting the acrylic polymer) with respect to the acrylic polymer (A) The total amount of the monomer components (A) is 100 parts by weight, preferably 0.05 to 0.5 parts by weight, more preferably 0.1 to 0.3 parts by weight.

[1-3. Carboxyl group-containing monomer, etc.]

The optical adhesive layer of the present invention does not contain or substantially contains an acid group-containing monomer as a monomer component constituting the base polymer. In the case where the optical adhesive layer of the present invention is an acrylic adhesive layer, the optical adhesive layer of the present invention preferably contains substantially no carboxyl group-containing monomer as a single constituting acrylic polymer (A). Body composition. Furthermore, the term "substantially does not contain" means excluding the inevitable incorporation without actively deploying. Further, the single system containing a carboxyl group means a monomer having at least one carboxyl group in the molecule. In view of obtaining a more excellent anticorrosive effect, the content of the carboxyl group-containing monomer is preferably 0.05 with respect to the total amount of the monomer component (100 parts by weight) constituting the acrylic polymer (A). The weight fraction or less (for example, 0 to 0.05 parts by weight), more preferably 0.01 parts by weight or less (for example, 0 to 0.01 parts by weight), still more preferably 0.001 part by weight or less (for example, 0 to 0.001 parts by weight) may be referred to as substantially Does not contain. In addition, examples of the carboxyl group-containing monomer include (meth)acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, methacrylic acid, and the like, and The monomer may, for example, also contain an acid anhydride group-containing monomer such as maleic anhydride or itaconic anhydride.

Further, in the case where the optical adhesive layer of the present invention is an acrylic adhesive layer In view of the fact that the optical adhesive layer of the present invention is not substantially free of a carboxyl group-containing monomer as a monomer component constituting the acrylic polymer (A), the optical adhesive layer of the present invention is preferably obtained. Further, a monomer having an acidic group (sulfo group, phosphoric acid group or the like) other than a carboxyl group is not substantially contained as a monomer component constituting the acrylic polymer (A). That is, the acrylic polymer (A) is preferably a monomer component having a constitution, and does not substantially contain any of a carboxyl group-containing monomer and a monomer having another acidic group. Specifically, the total amount of the carboxyl group-containing monomer and the other acid group-containing monomer constituting the monomer component of the acrylic polymer (A) is based on the total amount of the monomer components constituting the acrylic polymer (A). (100 parts by weight), preferably 0.05 parts by weight or less (e.g., 0 to 0.05 parts by weight), more preferably 0.01 parts by weight or less (e.g., 0 to 0.01 parts by weight), still more preferably 0.001 part by weight or less (e.g., 0~) 0.001 parts by weight) may be referred to as substantially absent.

In the same manner, the optical adhesive layer of the present invention is also a monomer component constituting a polymer other than the acrylic polymer (A) (for example, the following acrylic polymer (B)). It is preferred that the monomer having no acidic group is contained or substantially absent. For example, it is preferred that the monomer having no carboxyl group is substantially contained. In addition, the meaning of "substantially not contained", a preferable degree, and a monomer containing an acidic group other than a carboxyl group are the same as those of the monomer component constituting the acrylic polymer (A).

[1-4. Monomer-containing monomer]

Further, the optical adhesive layer of the present invention preferably contains no or substantially no basic group-containing monomer as a monomer component constituting the base polymer. For example, when the optical adhesive layer of the present invention is an acrylic adhesive layer containing the acrylic polymer (A) as a base polymer, it is preferred that substantially no monomer having a basic group is included as a constituent. The monomer component of the polymer other than the acrylic polymer (A) preferably does not substantially contain a basic group in the adhesive layer even when it is not a monomer component constituting the various polymers. The aspect of the body is also the same as in the case of a monomer having a carboxyl group. Also, the meaning of "substantially not contained" and the degree of preference are the same.

[1-5. Hydroxyl-containing monomer]

The single system containing a hydroxyl group means a monomer having at least one hydroxyl group in the molecule. Further, a monomer having at least one hydroxyl group in the molecule and having at least one carboxyl group in the molecule is a carboxyl group-containing monomer and is not a hydroxyl group-containing monomer. The hydroxyl group-containing monomer is not particularly limited, and specific examples thereof include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2-(meth)acrylate. Hydroxybutyl ester, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, hydroxyoctyl (meth)acrylate, (methyl) A hydroxyl group-containing (meth) acrylate such as hydroxydecyl acrylate, hydroxylauryl (meth) acrylate or (4-hydroxymethylcyclohexyl) (meth) acrylate; vinyl alcohol or allyl alcohol. Among them, the hydroxyl group-containing monomer is preferably a hydroxyl group-containing (meth) acrylate, more preferably 2-hydroxyethyl acrylate (HEA) from the viewpoint of improving the compatibility of the benzotriazole compound. ) 2-hydroxypropyl (meth)acrylate (HPA), 4-hydroxybutyl acrylate (4HBA). Further, the hydroxyl group-containing monomers may be used singly or in combination of two or more.

[1-6. Monomers Containing Nitrogen Atoms]

The single system containing a nitrogen atom means a monomer having at least one nitrogen atom in a molecule (within one molecule). The monomer having a hydroxyl group is not contained in the hydroxyl group-containing monomer. That is, in the present specification, a monomer having a hydroxyl group and a nitrogen atom in the molecule is contained in a monomer containing a nitrogen atom. Further, a monomer having at least one nitrogen atom in the molecule and having at least one carboxyl group in the molecule is a monomer having a carboxyl group and not a monomer having a nitrogen atom.

The monomer containing the nitrogen atom is preferably N-vinyl cyclic decylamine or (meth) acrylamide, from the viewpoint of improving foaming and peeling resistance. Further, the monomer containing a nitrogen atom may be used singly or in combination of two or more.

The N-vinyl cyclic decylamine is preferably an N-vinyl cyclic decylamine represented by the following formula (2) from the viewpoint of improving the compatibility of the benzotriazole-based compound.

[Chemical 2]

(In the formula (2), R ³ represents a divalent organic group)

R ³ in the above formula (2) 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).

The N-vinyl cyclic decylamine represented by the above formula (2) is preferably N-vinyl-2 from the viewpoint of improving foaming resistance and compatibility of the benzotriazole compound. - pyrrolidone (NVP), N-vinyl-2-piperidone, N-vinyl-2-caprolactam, N,N-dimethyl(meth)acrylamide, N,N- Diethyl (meth) acrylamide, N-vinyl-3-morpholinone, N-vinyl-1,3- 2-keto, N-vinyl-3,5-morpholinedione, etc., more preferably N-vinyl-2-pyrrolidone, N-vinyl-2-caprolactam, N,N- Dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, and further preferably N-vinyl-2-pyrrolidone.

Examples of the (meth) acrylamide are, for example, (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 (methyl). Acrylamide, N-octyl acrylamide, and the like. Further, in the above N-alkyl (meth) acrylamide, dimethylaminoethyl (meth) acrylamide, diethylaminoethyl (meth) acrylamide, and A (meth) acrylamide having an amine group such as methylaminopropyl (meth) acrylamide. Examples of the 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) (methyl) Acrylamide and 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-hydroxypropyl)(meth)acrylamide, N-(1-hydroxypropyl)(meth)acrylamide, N-(3-hydroxypropyl)(meth)acrylamide, N-(2-hydroxybutyl)(meth)acrylamide, N-(3-hydroxybutyl)(meth)acrylamide, N-(4-hydroxybutyl)(methyl)propenamide And N-methyl-N-2-hydroxyethyl (meth) acrylamide.

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

In addition, examples of the nitrogen atom-containing monomer other than the N-vinyl cyclic decylamine and the (meth) acrylamide may include, for example, aminoethyl (meth) acrylate and (meth) acrylate. Amino group-containing monomer such as dimethylaminoethyl ester, dimethylaminopropyl (meth)acrylate, orthobutylaminoethyl (meth)acrylate; acrylonitrile, methacrylonitrile, etc. a monomer containing a cyano group; (meth) propylene morpholine, N-vinyl piperazine , N-vinylpyrrole, N-vinylimidazole, N-vinylpyrrol , N-vinylmorpholine, N-vinylpyrazole, vinyl pyridine, vinyl pyrimidine, vinyl Azole or vinyl Azole, vinylthiazole, vinylisothiazole, vinyl anthracene a heterocyclic monomer such as (meth) propylene pyrrolidone, (meth) propylene pyrrolidine, (meth) propylene piperidine or N-methyl vinyl pyrrolidone; N-cyclohexyl Maleic acid such as maleimide, N-isopropyl maleimide, N-lauryl maleimide, N-phenyl maleimide, etc. Imine monomer, N-methyl itaconimine, N-ethyl itaconimine, N-butyl itaconimine, N-octyl ketimine, N-2- Ethylhexyl ketimine, N-Lauryl ketamine, N-cyclohexyl ketimine, etc., N-(methyl) propylene oxime Alkyl succinimide, N-(methyl) propylene fluorenyl-6-oxyhexamethylene succinimide, N-(methyl) propylene fluorene-8-oxy octamethyl succinimide, etc. An isocyanate group-containing monomer such as an amber quinone imine monomer or an isocyanate group-containing monomer such as 2-(meth)acryloxyethyl isocyanate.

[1-7. Other copolymerizable monomers]

Examples of the copolymerizable monomer in the acrylic polymer (A) include, in addition to the above-mentioned nitrogen atom-containing monomer and hydroxyl group-containing monomer, for example, an alkoxyalkyl (meth)acrylate [for example, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, 3-methoxy (meth)acrylate Propyl ester, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, 4-ethoxybutyl (meth)acrylate, etc.; a body [eg, glycidyl (meth)acrylate, methyl glycidyl (meth)acrylate, etc.]; a monomer containing a sulfonic acid group [eg, sodium vinyl sulfonate, etc.]; a monomer containing a phosphate group; An alicyclic hydrocarbon group (meth) acrylate [such as cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, (meth) acrylate a base ester or the like]; a (meth) acrylate having an aromatic hydrocarbon group [e.g., phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, etc.]; vinyl ester Classes [eg vinyl acetate, vinyl propionate, etc.]; aromatic vinyl compounds [eg styrene, vinyl toluene, etc.]; olefins or dienes [eg ethylene, propylene, butadiene, isoprene, Isobutylene, etc.]; vinyl ethers [e.g., vinyl alkyl ethers, etc.]; vinyl chloride, and the like.

Further, examples of the copolymerizable monomer in the acrylic polymer (A) include polyfunctional monomers. The polyfunctional monomer functions as a crosslinking component. 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, epoxy Acrylate, polyester acrylate, urethane acrylate, and the like. Furthermore, the polyfunctional monomer can be used alone Use or combine two or more types.

The content (ratio) of the above polyfunctional monomer in all the monomer units of the acrylic polymer (A) is not particularly limited, and is based on the total amount of the monomer components (100 parts by weight) constituting the acrylic polymer (A). It is preferably 0.5 parts by weight or less (e.g., 0 to 0.5 parts by weight), more preferably 0 to 0.35 parts by weight, still more preferably 0 to 0.2 parts by weight. When the content of the polyfunctional monomer is 0.5 parts by weight or less, the adhesive layer has an appropriate cohesive force, and the adhesion or the step absorbability is easily improved, which is preferable. Further, in the case of using a crosslinking agent, the polyfunctional monomer may not be used, but the content of the polyfunctional monomer in the case where no crosslinking agent is used is preferably 0.001 to 0.5 part by weight, more preferably It is 0.001 to 0.35 parts by weight, and more preferably 0.002 to 0.2 parts by weight.

[1-8. Acrylic polymer (B)]

In the case where the optical adhesive layer of the present invention contains the acrylic polymer (A) as a base polymer, the optical adhesive layer of the present invention preferably contains the above acrylic polymer (A) and has a weight average molecular weight of 1000 to 30000 acrylic polymer (B). When the acrylic polymer (B) is contained, the adhesion of the interface of the adhesive sheet to the adherend is improved, so that strong adhesion is easily obtained, and excellent foam peeling resistance is easily obtained. In the present specification, the "acrylic polymer (B) having a weight average molecular weight of 1,000 to 30,000" may be simply referred to as "acrylic polymer (B)".

The acrylic polymer (B) is preferably an acrylic polymer which is composed of a (meth) acrylate having a cyclic structure in a molecule as an essential monomer component, and more preferably An acrylic polymer having a cyclic structure of a (meth) acrylate and an alkyl (meth) acrylate having a linear or branched alkyl group as an essential monomer component. In other words, the acrylic polymer (B) is preferably an acrylic polymer containing a (meth) acrylate having a cyclic structure in a molecule as a monomer unit, and more preferably contained in a molecule. a (meth) acrylate having a cyclic structure and an alkyl (meth) acrylate having a linear or branched alkyl group as a monomer single An acrylic polymer.

The cyclic structure (ring) of the (meth) acrylate having a cyclic structure in the molecule (in one molecule) (hereinafter sometimes referred to as "ring-containing (meth) acrylate") is not particularly limited. It may be either an aromatic ring or a non-aromatic ring. Examples of the aromatic ring include an aromatic carbocyclic ring (for example, a condensed carbocyclic ring such as a monocyclic carbocyclic ring such as a benzene ring or a naphthalene ring), and various aromatic heterocyclic rings. Examples of the non-aromatic ring include a non-aromatic aliphatic ring (non-aromatic alicyclic ring) [for example, a cyclopentane ring, a cyclohexane ring, a cycloheptane ring, and a cyclooctane ring). An isocyclic alkane ring; a cycloalkenyl ring such as a cyclohexene ring, etc.], a non-aromatic bridging ring [eg, decane, decene, Alkane Alkane a bicyclic hydrocarbon ring in an alkene or the like; an aliphatic hydrocarbon ring (bridged hydrocarbon ring) or the like having a tricyclic or higher ring in adamantane or the like], a non-aromatic heterocyclic ring [for example, an epoxy ring or an oxolane ring) , oxetane ring, etc.].

The above-mentioned tricyclic pentyl group represented by the following formula (3a) and the dicyclopentane represented by the following formula (3b) are mentioned as the above-mentioned tricyclic pentyl group represented by the following formula (3a). The alkenyl group, the adamantyl group represented by the following formula (3c), the tricyclopentyl group represented by the following formula (3d), the tricyclopentenyl group represented by the following formula (3e), and the like.

In other words, examples of the ring-containing (meth) acrylate include cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, cycloheptyl (meth)acrylate, and (meth)acrylic acid. Cyclooctyl ester (cyclo) (meth) acrylate; (meth) acrylate a (meth) acrylate having a bicyclic aliphatic hydrocarbon ring, a dicyclopentyl (meth) acrylate, a dicyclopentyloxy (meth) acrylate, or a tricyclo(meth) acrylate Amyl ester, 1-adamantyl (meth)acrylate, 2-methyl-2-adamantyl (meth)acrylate, 2-ethyl-2-adamantyl (meth)acrylate, etc. (meth) acrylate of aliphatic hydrocarbon ring having three or more rings; aryl (meth) acrylate such as phenyl (meth) acrylate; aryloxy (meth) acrylate such as phenoxyethyl (meth) acrylate A (meth) acrylate having an aromatic ring such as an aralkyl (meth) acrylate such as a benzyl ester or a benzyl (meth) acrylate. Among them, as the above-mentioned ring-containing (meth) acrylate, in particular, a (meth) acrylate containing a non-aromatic ring is preferred, and more preferably cyclohexyl acrylate (CHA) or methacrylic acid cyclohexane. Ester (CHMA), dicyclopentyl acrylate (DCPA), dicyclopentyl methacrylate (DCPMA), further preferably dicyclopentyl acrylate (DCPA), dicyclopentyl methacrylate ( DCPMA). Further, the ring-containing (meth) acrylate may be used singly or in combination of two or more.

When a (meth) acrylate having a tricyclic or higher aliphatic hydrocarbon ring (especially a bridged hydrocarbon ring of three or more rings) is used in the above-mentioned (meth) acrylate containing a non-aromatic ring, especially It is preferable in terms of being difficult to cause polymerization inhibition. Further, the dicyclopentyl group represented by the above formula (3a) having no unsaturated bond, the adamantyl group represented by the above formula (3c), and the tricyclopentyl group represented by the above formula (3d) are used ( In the case of a methyl acrylate, the foaming peeling resistance can be further improved, and further, the adhesion to a low-polarity adherend such as polyethylene or polypropylene can be remarkably improved.

The content (ratio) of the above-mentioned ring-containing (meth) acrylate in all the monomer units (the total amount of the monomer components constituting the acrylic polymer (B)) of the acrylic polymer (B) is not particularly limited. The total amount (100 parts by weight) of the monomer components constituting the acrylic polymer (B) is preferably 10 to 90 parts by weight, more preferably 20 to 80 parts by weight. When the content of the ring-containing (meth) acrylate is 10 parts by weight or more, the foaming and peeling resistance is easily improved, so good. Moreover, when the content is 90 parts by weight or less, the adhesive layer has appropriate flexibility, and it is easy to improve the adhesion or the step absorbability, and the like.

In addition, examples of the (meth)acrylic acid alkyl ester having a linear or branched alkyl group as the monomer unit of the acrylic polymer (B) include methyl (meth)acrylate and (methyl). Ethyl acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth)acrylate, dibutyl (meth)acrylate, ( Tert-butyl methacrylate, amyl (meth) acrylate, isoamyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, decyl (meth)acrylate, (methyl) Isodecyl acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, tetradecyl (meth) acrylate, ( Pentadecyl methyl methacrylate, cetyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, (meth) acrylate Alkyl ester, (meth) propyl The alkyl carbon acid eicosyl ester having 1 to 20 atoms of (meth) acrylate and the like. Among them, methyl methacrylate (MMA) is preferred because it has good compatibility with the acrylic polymer (A). Further, the alkyl (meth)acrylate may be used singly or in combination of two or more.

The above-mentioned (meth)acrylic acid alkyl ester having a linear or branched alkyl group in all the monomer units (the total amount of the monomer components constituting the acrylic polymer (B)) of the acrylic polymer (B) The content (ratio) is not particularly limited, and is preferably from 10 to 90% by weight based on the total amount of the monomer component (100 parts by weight) constituting the acrylic polymer (B) in terms of foaming resistance. The portion is more preferably 20 to 80 parts by weight, still more preferably 20 to 60 parts by weight. When the content is 10 parts by weight or more, the adhesion to the adherend made of an acrylic resin or polycarbonate is particularly likely to be improved, which is preferable.

The monomer unit of the acrylic polymer (B) may be included in addition to the above-mentioned ring-containing (meth) acrylate and alkyl (meth) acrylate having a linear or branched alkyl group. Containing a monomer (copolymerizable monomer) copolymerizable with the monomers. In addition, the content (ratio) of the above-mentioned copolymerizable monomer in all the monomer units (the total amount of the monomer components constituting the acrylic polymer (B)) of the acrylic polymer (B) is not particularly limited, and is not particularly limited. The total amount (100 parts by weight) of the monomer component constituting the acrylic polymer (B) is preferably 49.9 parts by weight or less (for example, 0 to 49.9 parts by weight), more preferably 30 parts by weight or less. Further, the copolymerizable monomers may be used singly or in combination of two or more.

The above-mentioned copolymerizable monomer (the above-mentioned copolymerizable monomer constituting the acrylic polymer (B)) as a monomer unit of the acrylic polymer (B) may, for example, be an alkoxyalkyl (meth)acrylate. Esters [eg 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, 3-(meth)acrylate Methoxypropyl ester, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, 4-ethoxybutyl (meth)acrylate, etc.; hydroxyl group ( Hydroxyl) monomer [eg 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate , 4-hydroxybutyl (meth)acrylate, hydroxyalkyl (meth)acrylate such as 6-hydroxyhexyl (meth)acrylate, vinyl alcohol, allyl alcohol, etc.; amidino group-containing monomer [ For example, (meth) acrylamide, N,N-dimethyl(meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) propylene oxime Amine, N-butoxymethyl (meth) acrylamide, N-hydroxyethyl (meth) acrylamide An amine group-containing monomer [eg, aminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, tert-butylaminoethyl (meth) acrylate, etc.]; a monomer of a cyano group [e.g., acrylonitrile, methacrylonitrile, etc.]; a monomer containing a sulfonic acid group [e.g., sodium vinyl sulfonate, etc.]; a monomer containing a phosphate group [e.g., 2-hydroxyethyl propylene ruthenium phosphate Ester, etc.]; isocyanate group-containing monomer [eg 2-methylpropenyloxyethyl isocyanate, etc.], quinone imine group-containing monomer [cyclohexyl maleimide, isopropyl cis-butane] Ethylene diimine, etc.].

As described above, the acrylic polymer (B) preferably contains a (meth) acrylate having a cyclic structure in a molecule and an alkyl (meth) acrylate having a linear or branched alkyl group. An acrylic polymer having an ester as a monomer unit. Among them, an acrylic polymer containing a ring-containing (meth) acrylate and the above-mentioned alkyl (meth) acrylate having a linear or branched alkyl group as a monomer unit is preferable. An acrylic polymer comprising a ring-containing (meth) acrylate and an alkyl (meth) acrylate having a linear or branched alkyl group as the above monomer unit, relative to the constituting acrylic polymer The amount of the ring-containing (meth) acrylate in the total amount (100 parts by weight) of the monomer component (B) is not particularly limited, but is preferably 10 to 90 parts by weight, more preferably 20 to 80 parts by weight. Further, the content of the alkyl (meth)acrylate having a linear or branched alkyl group is not particularly limited, but is preferably 10 to 90 parts by weight, more preferably 20 to 80 parts by weight, still more preferably 20 to 60 parts by weight.

Further, as a particularly preferable specific configuration of the acrylic polymer (B), (1) is selected from the group consisting of dicyclopentyl acrylate, dicyclopentyl methacrylate, cyclohexyl acrylate, and methacrylic acid. An acrylic polymer having at least one monomer selected from the group consisting of cyclohexyl ester and (2) methyl methacrylate as a monomer unit. (1) dicyclopentyl acrylate, dicyclopentyl methacrylate, acrylic acid in all the monomer units of the acrylic polymer (B) in the acrylic polymer (B) of the above-mentioned particularly preferred composition. The content of cyclohexyl ester and cyclohexyl methacrylate (in the case of including two or more kinds, the total amount of these) is relative to the total amount of the monomer component (100 parts by weight) constituting the acrylic polymer (B). It is preferably 30 to 70 parts by weight, and the content of (2) methyl methacrylate is preferably 30 to 70 parts by weight. However, the acrylic polymer (B) is not limited to the specific configuration described above.

The acrylic polymer (B) can be obtained by polymerizing the above monomer components by a known or conventional polymerization method. Examples of the polymerization method of the acrylic polymer (B) 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, a bulk polymerization method and a solution polymerization method are preferred, and a solution polymerization method is more preferred.

When the acrylic polymer (B) is polymerized, various usual solvents can also be used. Examples of the solvent include esters such as ethyl acetate and n-butyl acetate; toluene, benzene, and the like. Aromatic hydrocarbons; aliphatic hydrocarbons such as n-hexane and n-heptane; alicyclic hydrocarbons such as cyclohexane and methylcyclohexane; and ketones such as methyl ethyl ketone and methyl isobutyl ketone Solvent. Further, the above solvents may be used singly or in combination of two or more.

Further, in the polymerization of the acrylic polymer (B), a known or conventional polymerization initiator (for example, a thermal polymerization initiator or a photopolymerization initiator) may be used. Further, the polymerization initiators may be used singly or in combination of two or more.

As the thermal polymerization initiator, for example, 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azobis-2-methylbutyronitrile (AMBN), 2,2'- Azobis(2-methylpropionic acid) dimethyl ester, 4,4'-azobis-4-cyanoshikimic acid, 2,2'-azobis(4-methoxy-2,4- Dimethylvaleronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 1,1'-azobis(cyclohexane-1-carbonitrile), 2,2' -Azo-based initiator such as azobis(2,4,4-trimethylpentane); benzamidine peroxide, tert-butyl hydroperoxide, di-tert-butyl peroxide, third-butyl Base benzoate, dicumyl peroxide, 1,1-bis(t-butylperoxide)-3,3,5-trimethylcyclohexane, 1,1-double (peroxidation) A peroxide-based initiator such as a third butyl) cyclododecane. Further, in the case of performing solution polymerization, it is preferred to use an oil-soluble polymerization initiator. Further, the thermal polymerization initiators may be used singly or in combination of two or more.

The amount of the thermal polymerization initiator to be used is not particularly limited. For example, it is 100 parts by weight based on the total of the monomer units (the total amount of the monomer components of the acrylic polymer (B)) constituting the acrylic polymer (B). It is 0.1 to 15 parts by weight.

In addition, the photopolymerization initiator is not particularly limited, and examples thereof include the same photopolymerization initiators used in the polymerization of the acrylic polymer (A) described above. . The amount of the photopolymerization initiator to be used is not particularly limited and can be appropriately selected.

In the polymerization of the acrylic polymer (B), a chain transfer agent may be used in order to adjust the molecular weight (specifically, in order to adjust the weight average molecular weight to 1,000 to 30,000). Examples of the chain transfer agent include 2-mercaptoethanol, α-thioglycerol, and 2,3- Dimercapto-1-propanol, octyl mercaptan, third mercapto mercaptan, dodecyl mercaptan (lauryl mercaptan), thirty-dodecyl mercaptan, glycidyl mercaptan, thio Glycolic acid, methyl thioglycolate, ethyl thioglycolate, propyl thioglycolate, butyl thioglycolate, tert-butyl thioglycolate, 2-ethylhexyl thioglycolate , octyl thioglycolate, isooctyl thioglycolate, decyl thioglycolate, lauryl thioglycolate, thioglycolate of ethylene glycol, thioethanol of neopentyl glycol An acid ester, a thioglycolate of pentaerythritol, an α-methylstyrene dimer, or the like. Among them, from the viewpoint of suppressing whitening of the adhesive sheet by humidification, α-thioglycerol, methyl thioglycolate, and preferably α-thioglycerol are preferable. Further, the chain transfer agents may be used singly or in combination of two or more.

The content (usage amount) of the chain transfer agent is not particularly limited, and is 100 parts by weight based on 100 parts by weight of all the monomer units (the total monomer components of the acrylic polymer (B)) constituting the acrylic polymer (B). It is preferably 0.1 to 20 parts by weight, more preferably 0.2 to 15 parts by weight, still more preferably 0.3 to 10 parts by weight. By setting the content (usage amount) of the chain transfer agent to the above range, an acrylic polymer having a weight average molecular weight of 1,000 to 30,000 can be easily obtained.

The weight average molecular weight (Mw) of the acrylic polymer (B) is from 1,000 to 30,000, preferably from 1,000 to 20,000, more preferably from 1,500 to 10,000, still more preferably from 2,000 to 8,000. Since the weight average molecular weight of the acrylic polymer (B) is 1000 or more, the adhesion or retention property is improved, and the foaming peeling resistance is improved. On the other hand, since the weight average molecular weight of the acrylic polymer (B) is 30,000 or less, it is easy to improve the adhesion and the foaming peeling resistance is improved.

The weight average molecular weight (Mw) of the acrylic polymer (B) can be determined by GPC (Gel permeation chromatography) and polystyrene conversion. For example, a high-speed GPC apparatus "HPLC-8120GPC" manufactured by Tosoh Corporation can be used and measured according to the following conditions.

Pipe column: TSKgel SuperHZM-H/HZ4000/HZ3000/HZ2000

Solvent: tetrahydrofuran

Flow rate: 0.6ml/min

The glass transition temperature (Tg) of the acrylic polymer (B) is not particularly limited, but is preferably 20 to 300 ° C, more preferably 30 to 300 ° C, still more preferably 40 to 300 ° C. When the glass transition temperature of the acrylic polymer (B) is 20 ° C or more, it is easy to improve the foaming peeling resistance, which is preferable. Further, when the glass transition temperature of the acrylic polymer (B) is 300 ° C or lower, the adhesive layer has appropriate flexibility, and it is easy to obtain good adhesion or good step absorbability, and it is easy to obtain excellent subsequent reliability. Therefore, it is better.

The glass transition temperature (Tg) of the acrylic polymer (B) is a glass transition temperature (theoretical value) represented by the following formula.

1/Tg=W ₁ /Tg ₁ +W ₂ /Tg ₂ +...+W _n /Tg _n

In the above formula, Tg represents the glass transition temperature (unit: K) of the acrylic polymer (B), and Tg _i represents the glass transition temperature (unit: K) when the monomer i forms a homopolymer, and W _i represents the monomer i The weight fraction (i = 1, 2, ... n) in the total amount of monomer components.

As the Tg of the homopolymer constituting the monomer of the acrylic polymer (B), the values described in the following Table 1 can be used. Further, as the Tg of the homopolymer of the monomer not described in Table 1, the numerical values described in "Polymer Handbook" (3rd edition, John Wiley & Sons, Inc, 1989) can be used. Further, as the Tg of the homopolymer of the monomer which is not described in the above-mentioned literature, the value obtained by the above measurement method (the peak top temperature of tan δ obtained by the viscoelasticity test) can be used.

Further, the copolymer of "DCPMA/MMA=60/40" in Table 1 means a copolymer of 60 parts by weight of DCPMA and 40 parts by weight of MMA.

The content of the acrylic polymer (B) in the case where the optical adhesive layer of the present invention contains the acrylic polymers (A) and (B) is not particularly limited, and is 100% by weight based on the acrylic polymer (A). The portion is preferably from 1 to 30 parts by weight, more preferably from 2 to 20 parts by weight, still more preferably from 2 to 10 parts by weight. In other words, the content of the acrylic polymer (B) in the optical adhesive layer of the present invention is not particularly limited, and is preferably 1 to 100 parts by weight based on 100 parts by weight of all the monomer units of the acrylic polymer (A). 30 parts by weight, more preferably 2 to 20 parts by weight, still more preferably 2 to 10 parts by weight. The content of the acrylic polymer (B) in the adhesive composition is not particularly limited, and is, for example, preferably from 1 to 30 parts by weight, more preferably from 2 to 20 parts by weight, based on 100 parts by weight of the above monomer mixture. It is preferably 2 to 10 parts by weight. When the content of the acrylic polymer (B) is at least 1 part by weight, it is easy to obtain excellent adhesiveness and excellent foaming peeling resistance, which is preferable. In addition, when the content of the acrylic polymer (B) is 30 parts by weight or less, it is easy to obtain excellent transparency and subsequent reliability, which is preferable.

The method for producing the above-mentioned adhesive layer containing the acrylic polymers (A) and (B) is not particularly limited. For example, it can be produced by adding a benzotriazole-based compound, an acrylic polymer (B), an additive, or the like to a monomer mixture or a partial polymer thereof to form an acrylic polymer (A) as needed.

[1-9. Additives]

In the above adhesive layer, a crosslinking agent, a crosslinking accelerator, a decane coupling agent, an adhesion-imparting resin (rosin derivative, polyterpene resin, petroleum resin) may be contained as needed within a range not impairing the characteristics of the present invention. , oil-soluble phenol, etc., anti-aging agents, fillers, colorants (pigments or dyes, etc.), ultraviolet absorbers, antioxidants, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, etc. are known. Additives. Further, the above additives may be used singly or in combination of two or more.

When a crosslinking agent is contained in the said adhesive layer, the base polymer is bridge|crosslinked, it is set as the gel fraction, and it is easy to improve the foaming peeling resistance. For example, the acrylic polymer (especially the acrylic polymer (A)) can be crosslinked to easily increase the control of the gel fraction, and thus the foaming peel resistance can be easily improved. Examples of the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, a melamine crosslinking agent, and a peroxide crosslinking agent, and examples thereof include a urea crosslinking agent and a metal. An alkoxide 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. In the case where the optical adhesive layer of the present invention is an adhesive layer containing the acrylic polymer (A) as a base polymer, isocyanate-based crosslinking is preferred in terms of improving foaming and peeling resistance. A crosslinking agent or an epoxy crosslinking agent is more preferably an isocyanate crosslinking agent. Further, the crosslinking agent may be used singly or in combination of two or more.

Examples of the isocyanate-based crosslinking agent (polyfunctional isocyanate compound) include lower aliphatic polycondensation such as 1,2-ethylene diisocyanate, 1,4-butene diisocyanate, and 1,6-hexamethylene diisocyanate. Isocyanate; cycloaliphatic diisocyanate, cyclohexyl diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, hydrogenated xylene diisocyanate and other alicyclic polyisocyanates; 2,4-toluene diisocyanate, 2, An aromatic polyisocyanate such as 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 (manufactured by Japan Polyurethane Industry Co., Ltd., trade name "Coronate L"), and trishydroxyl Methylpropane/hexamethylene diisocyanate adduct [manufactured by Japan Polyurethane Industry Co., Ltd., trade name "Coronate HL"], trimethylolpropane/benzodimethyl diisocyanate adduct [Mitsan Chemical Co., Ltd. manufactures, trade name "Takenate D-110N"] and other commercial products.

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 commercially available product such as "Tetrad C" manufactured by Mitsubishi Gas Chemical Co., Ltd. may be mentioned.

The content of the crosslinking agent in the optical adhesive layer is not particularly limited. For example, when the optical adhesive layer of the present invention is an adhesive layer containing the acrylic polymer (A) as a base polymer, With respect to 100 parts by weight of the acrylic polymer (A), it is preferably 0.001 to 10 parts by weight, more preferably 0.01 to 5 parts by weight. When the content of the crosslinking agent is 0.001 part by weight or more, the foaming peeling resistance is easily improved, which is preferable. On the other hand, when the content of the crosslinking agent is 10 parts by weight or less, the adhesive layer has appropriate flexibility and is easy to increase the adhesion, which is preferable.

When the oxime coupling agent is contained in the above-mentioned optical adhesive layer, it is easy to obtain excellent adhesion to glass (especially excellent adhesion reliability to glass under high temperature and high humidity), which is preferable. The decane coupling agent is not particularly limited, and examples thereof include γ-glycidoxypropyltrimethoxydecane, γ-glycidoxypropyltriethoxydecane, and γ-aminopropyltrimethoxydecane. , N-phenyl-aminopropyltrimethoxydecane, and the like. Among them, γ-glycidoxypropyltrimethoxydecane is preferred. 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. Further, the decane coupling agent may be used singly or in combination of two or more.

The content of the above-described decane coupling agent in the above-mentioned optical adhesive layer is not particularly limited. For example, the optical adhesive layer of the present invention contains an acrylic polymer (A) as a component. In the case of the adhesive layer of the base polymer, it is preferably 0.01 to 1 part by weight, more preferably 0.03, based on 100 parts by weight of the acrylic polymer (A) in terms of improving the reliability of the glass. ~0.5 parts by weight.

[2. Adhesive tablets]

The adhesive sheet of the present invention is not particularly limited as long as it has the above-mentioned optical adhesive layer (the optical adhesive layer of the present invention).

The adhesive sheet of the present invention may be a double-sided adhesive sheet having both surfaces of the adhesive layer on both sides, or a single-sided adhesive sheet having only one surface to be the surface of the adhesive layer. Among them, from the viewpoint of bonding two members to each other, a double-sided adhesive sheet is preferable. In addition, in the case of the "adhesive sheet" in the present specification, the band-shaped one, that is, the "adhesive tape" is also included. Further, in the present specification, the surface of the adhesive layer may be referred to as an "adhesive surface".

The adhesive sheet of the present invention may also be provided with a separator (release liner) on the adhesive surface until use.

The adhesive sheet of the present invention may be a so-called "substrate-free" adhesive sheet (hereinafter sometimes referred to as "substrate-free adhesive sheet") which does not have a substrate (base material layer), or may have a type of substrate. Adhesive sheet (hereinafter sometimes referred to as "adhesive sheet with substrate"). Examples of the substrate-less pressure-sensitive adhesive sheet include a double-sided adhesive sheet containing only the pressure-sensitive adhesive layer, or an adhesive layer including the pressure-sensitive adhesive layer and the adhesive layer (sometimes referred to as “another adhesive agent”. Layer") double-sided adhesive sheet, etc. On the other hand, as an adhesive sheet with a base material, the adhesive sheet which has the said adhesive layer on at least one side of a base material, etc. are mentioned. Among them, a substrate-free adhesive sheet (non-substrate double-sided adhesive sheet) is preferred, and a substrate-free double-sided adhesive sheet comprising only the above adhesive layer is more preferred. Further, in the above-mentioned "base material (base material layer)", the separator which is peeled off when the adhesive sheet is used (attached) is not included.

The adhesive sheet of the present invention is preferably a substrate-free adhesive sheet. The reason for this is that if the adhesive sheet with the substrate attached to the moisture-proof substrate is used, it is considered that the corrosion-resistant function can be imparted to some extent, so that the substrate-free adhesive sheet has a higher meaning of imparting a corrosion-resistant function.

[2-1. Various physical properties of adhesive sheets]

The 180° peeling adhesion force of the adhesive sheet of the present invention to the glass sheet (especially the 180° peeling adhesion force provided by the above adhesive layer (the optical adhesive layer of the present invention) facing the glass sheet) is not particularly In the case where the adhesive force is high, it is preferably 8 N/20 mm or more, more preferably 10 N/20 mm or more, and further preferably 12 N/, from the viewpoint of obtaining sufficient adhesion to the metal surface and improving the corrosion resistance. 20 mm or more, and more preferably 14 N/20 mm or more. When the 180° peeling adhesion force of the adhesive sheet of the present invention to the glass sheet is a fixed value or more, the adhesion to the glass and the swell of the step are more excellent. Further, the upper limit of the 180° peeling adhesion force of the adhesive sheet of the present invention to the glass sheet is not particularly limited, and is, for example, preferably 40 N/20 mm, more preferably 60 N/20 mm. The 180° peeling adhesion force to the glass plate was determined by the following 180° peeling adhesion measurement method.

The glass plate is not particularly limited, and for example, the product name "soda lime glass #0050" (manufactured by Matsunaga Glass Industry Co., Ltd.) can be cited. Further, an alkali-free glass or a chemically strengthened glass may also be mentioned.

The 180° peeling adhesion force of the adhesive sheet of the present invention relative to the acrylic sheet (especially the 180° peeling adhesion force of the adhesive surface provided by the above adhesive layer (the optical adhesive layer of the present invention) relative to the acrylic sheet) It is not particularly limited, and if the adhesion is high, it is preferably 10 N/20 mm or more, more preferably 12 N/20 mm or more, from the viewpoint of obtaining sufficient adhesion to the metal surface and improving the corrosion resistance. It is 14N/20mm or more. When the 180° peeling adhesion force of the adhesive sheet of the present invention with respect to the acrylic plate is 10 N/20 mm or more, it is easy to obtain good adhesion to the acrylic plate or suppression of bulging in a good step, and therefore it is preferable. . Further, the upper limit of the 180° peeling adhesion force of the adhesive sheet of the present invention with respect to the acrylic sheet is not particularly limited, and is, for example, 40 N/20 mm, more preferably 60 N/20 mm. The 180° peeling adhesion force of the acrylic plate can be determined by the following 180° peeling adhesion measurement method.

The acrylic plate is not particularly limited, and examples thereof include a PMMA plate. The product name is "Acrylite", manufactured by Mitsubishi Rayon Co., Ltd.).

(A-1.180° peeling force measurement method)

The adhesive surface of the adhesive sheet was attached to the adherend, and the pressure was applied under a pressure of 2 kg of the roller and reciprocated once, and aged for 30 minutes in an environment of 23 ° C and 50% RH. After aging, according to JIS Z 0237, the adhesive sheet was peeled from the adherend and the 180° peeling force was measured under the conditions of 23° C. and 50% RH at a stretching speed of 300 mm/min and a peeling angle of 180°. N/20mm).

(B. Thickness)

The thickness (total thickness) of the adhesive sheet of the present invention is not particularly limited, but is preferably 12 to 350 μm, more preferably 12 to 300 μm. When the thickness is more than or equal to a fixed value, peeling of the step portion is less likely to occur, which is preferable. Moreover, when the thickness is not more than a certain value, it is easy to maintain an excellent appearance at the time of production, which is preferable. Further, the thickness of the adhesive sheet of the present invention includes the thickness of the separator.

(C. Haze)

The haze of the pressure-sensitive adhesive sheet of the present invention (according to JIS K7136) is not particularly limited, but is preferably 1.0% or less, more preferably 0.8% or less. When the haze is 1.0% or less, excellent transparency or an excellent appearance can be obtained, which is preferable. Further, regarding the haze, for example, after the adhesive sheet is placed in a normal state (23° C., 50% RH) for at least 24 hours, the separator is peeled off when the separator is provided, and the adhesive sheet is attached. In the case of a glass slide (for example, a total light transmittance of 91.8% and a haze of 0.4%), the obtained sample is used as a sample by a haze meter (manufactured by Murakami Color Technology Research Co., Ltd., trade name "HM" -150") The measurement was performed.

(D. Total light transmittance)

The total light transmittance (in accordance with JIS K7361-1) of the adhesive sheet of the present invention in the visible light wavelength region is not particularly limited, but is preferably 85% or more, and more preferably 88% or more. When the total light transmittance is 85% or more, excellent transparency or an excellent appearance can be obtained, which is preferable. Furthermore, regarding the above-mentioned total light transmittance, for example, the adhesive sheet can be placed in a normal state. After being left at (23 ° C, 50% RH) for at least 24 hours, the separator is peeled off when the separator is provided, and the adhesive sheet is attached to the glass slide (for example, the total light transmittance is 91.8%, and the mist The obtained one was measured by a haze meter (manufactured by Murakami Color Technology Research Co., Ltd., trade name "HM-150") as a sample.

[2-2. Manufacturing method of adhesive sheet]

The adhesive sheet of the present invention is not particularly limited, and is preferably produced according to a known or customary production method. For example, when the adhesive sheet of the present invention is a substrate-free adhesive sheet, it is obtained by forming the above-mentioned adhesive layer (the optical adhesive layer of the present invention) on the separator by the above method. Moreover, in the case where the adhesive sheet of the present invention is an adhesive sheet with a substrate, it can be obtained by directly forming the above-mentioned adhesive layer on the surface of the substrate (direct printing method), or by temporarily placing it on the spacer. After the above-mentioned adhesive layer is formed, the above-mentioned adhesive layer is provided on the substrate so as to be transferred (bonded) to the substrate (transfer method).

[2-3. Adhesive layer of adhesive sheet]

The gel fraction (the ratio of the solvent-insoluble component) of the above-mentioned adhesive layer (the optical adhesive layer of the present invention) of the adhesive sheet of the present invention is not particularly limited, but is preferably 65 to 99%, more preferably 68 to 68. 95%, and further preferably 70 to 95%. When the gel fraction is 65% or more, the cohesive force of the above-mentioned adhesive layer is improved, foaming or peeling at the interface with the adherend in a high-temperature environment is suppressed, and excellent foaming peeling resistance is easily obtained, which is preferable. Further, when the gel fraction is 99% or less, appropriate flexibility is obtained, and the adhesion is further improved, which is preferable.

(gel fraction)

Specifically, the gel fraction (the ratio of the solvent-insoluble component) is a value calculated by the following method for measuring the gel fraction.

The self-adhesive sheet is an adhesive layer: about 0.1 g, and is coated on a porous tetrafluoroethylene sheet (trade name "NTF1122", manufactured by Nitto Denko Corporation) having an average pore diameter of 0.2 μm, and then bundled with a kite string. The weight at this time was measured, and this weight was made into the weight before immersion. Further, the pre-impregnation weight is the total weight of the adhesive layer (the above-mentioned adhesive layer), the tetrafluoroethylene sheet, and the kite line. Further, the total weight of the tetrafluoroethylene sheet and the kite line was also measured in advance, and the weight was defined as the weight of the bag.

Next, the adhesive layer was coated with a sheet of tetrafluoroethylene and bundled with a kite string (referred to as "sample"), placed in a 50 ml container filled with ethyl acetate, and allowed to stand at 23 ° C for 7 days. Thereafter, the sample was taken out from the container (after ethyl acetate treatment), transferred to an aluminum cup, and dried in a dryer at 130 ° C for 2 hours to remove ethyl acetate, and then the weight was measured, and the weight was measured as impregnation. After weight.

Further, the gel fraction was calculated according to the following formula.

Gel fraction [% (% by weight)] = (X-Y) / (Z-Y) × 100

In addition, the gel fraction can be controlled, for example, according to the monomer composition of the base polymer (for example, the acrylic polymer (A)), the weight average molecular weight, the amount of the crosslinking agent used (addition amount), and the like.

(300% tensile residual stress)

The 300% tensile residual stress of the above adhesive layer (the optical adhesive layer of the present invention) is not particularly limited, but is preferably 7 to ²⁵ N/cm ² , more preferably 7 to 20 N/cm ² , and still more preferably 7 to 16 N/cm ² , and more preferably 7 to 14 N/cm ² . When the 300% tensile residual stress is 7 N/cm ² or more, it is easy to obtain good foam peeling resistance, which is preferable. Further, when the 300% tensile residual stress is ²⁵ N/cm ² or less, good stress relaxation property is obtained, and good step followability is easily obtained, which is preferable.

When the adhesive sheet of the present invention has the above-mentioned adhesive layer having a 300% tensile residual stress within a specific range, excellent stress relaxation property is easily obtained, and excellent step followability is easily exhibited. For example, it is also possible to follow well with a large step (for example, a step having a height of about 45 μm, especially a step having a height of 20 to 50 μm).

The 300% tensile residual stress is obtained by stretching the adhesive layer in the longitudinal direction at an environment of 23 ° C until elongation (deformation) of 300%, and maintaining the elongation, and applying the adhesive layer after 300 seconds from the end of stretching. The tensile load is divided by the value obtained by dividing the tensile load by the initial sectional area of the adhesive layer (the cross-sectional area before stretching) (N/cm ² ). Furthermore, the initial elongation of the adhesive layer is 100%.

(thickness)

The thickness of the above adhesive layer (especially the optical adhesive layer of the present invention) is not particularly limited, but is preferably 12 to 350 μm, more preferably 12 to 300 μm. If the thickness is fixed or more, the step followability or the subsequent reliability is improved, which is preferable. Moreover, when the thickness is not more than a certain value, workability and manufacturability are particularly excellent, which is preferable.

(Production method)

The method for producing the pressure-sensitive adhesive layer (the optical pressure-sensitive adhesive layer of the present invention) is not particularly limited, and for example, the above-mentioned pressure-sensitive adhesive composition is coated on a substrate or a release liner, as needed. A method of drying, hardening, or drying and hardening.

Further, a coating method of the above-mentioned adhesive composition can also be carried out by a known coating method. 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.

[2-4. Other layers of adhesive sheets]

In addition to the above adhesive layer (the optical adhesive layer of the present invention), the adhesive sheet of the present invention may have other layers. As the layer thereof, for example, an adhesive layer (adhesive layer other than the above adhesive layer), an intermediate layer, an undercoat layer, and the like can be cited. Furthermore, the adhesive sheet of the present invention may have two or more layers.

[2-5. Substrate of adhesive sheet]

The base material in the case where the pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet with a base material is not particularly limited, and examples thereof include various plastic films such as a plastic film, an antireflection (AR) film, a polarizing plate, and a phase difference plate. Examples of the material of the plastic film or the like include a polyester resin such as polyethylene terephthalate (PET) and an acrylic tree such as polymethyl methacrylate (PMMA). Fat, polycarbonate, triacetyl cellulose (TAC), polyfluorene, polyarylate, polyimine, polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, ethylene-propylene copolymer, trade name A plastic material such as a cyclic olefin polymer such as "Arton (a cyclic olefin polymer, manufactured by JSR Co., Ltd.)" or a product name "Zeonor (a cyclic olefin polymer, manufactured by Zeon Co., Ltd.)". Further, these plastic materials may be used singly or in combination of two or more. Further, the "substrate" is a portion which is attached to the adherend together with the adhesive layer when the adhesive sheet is attached to the adherend. The "substrate" does not include a separator (release liner) which is peeled off when the adhesive sheet is used (at the time of attachment).

The above substrate is preferably transparent. The total light transmittance (in accordance with JIS K7361-1) of the substrate in the visible light wavelength region 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 K7136) is not particularly limited, but is preferably 1.0% or less, more preferably 0.8% or less. Examples of such a transparent substrate include a PET film, a product name "Arton", and a non-alignment film such as "Zeonor".

The thickness of the substrate is not particularly limited, and is, for example, preferably 12 to 500 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 undercoat treatment may be suitably employed.

[2-6. Separator of adhesive sheet]

The adhesive sheet of the present invention may also be provided with a separator (release liner) on the adhesive surface until use. Furthermore, in the case where the adhesive sheet of the present invention is a double-sided adhesive sheet, each adhesive surface can be separately protected by two spacers, or can be wound by a spacer which is a peeling surface on both sides. The shape of the roll is protected. The separator 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 adhesive sheet of the present invention is a substrate-free adhesive sheet, the separator also functions as a support for the adhesive layer. Furthermore, it is not necessary to provide a spacer.

The separator is not particularly limited, and conventional release paper or the like can be used. E.g Examples thereof include a substrate having a release-treated layer, a low-adhesive substrate containing a fluoropolymer, or a low-adhesive substrate comprising a non-polar polymer. Examples of the substrate having the release treatment layer include a plastic film or paper surface-treated with a release treatment agent such as polyfluorene-based, 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-hexafluoropropylene. Copolymer, chlorofluoroethylene-vinylidene fluoride copolymer, and the like. In addition, examples of the nonpolar polymer include an olefin resin (for example, polyethylene or polypropylene), and a polyester base material (polyethylene terephthalate base material or polynaphthalene). An ethylene formate base material, a polybutylene terephthalate base material, etc.). Further, the separator can be formed by a known or customary method. Further, the thickness of the separator or the like is not particularly limited.

[2-7. Use of adhesive sheets, etc.]

Since the pressure-sensitive adhesive sheet of the present invention has the above-mentioned pressure-sensitive adhesive layer (the optical pressure-sensitive adhesive layer of the present invention), it is excellent in adhesion and foam-resistant peeling resistance. Further, the stress relaxation property is excellent, and the step followability is excellent. Therefore, reliability is excellent in subsequent reliability, particularly at a high temperature. Moreover, the undulation under high temperature environment is excellent in suppression.

Therefore, the adhesive sheet of the present invention is useful for an adherend which is likely to cause foaming at the interface at a high temperature. For example, polymethyl methacrylate resin (PMMA) sometimes contains unreacted monomers, and foaming by foreign matter is likely to occur at high temperatures. Further, polycarbonate (PC) tends to generate water and carbon dioxide at a high temperature. Since the adhesive sheet of the present invention is excellent in foam peeling resistance, it is also useful for a plastic adherend containing such a resin.

Further, in addition to the adherend having a small coefficient of linear expansion, the adhesive sheet of the present invention is also useful for an adherend having a large coefficient of linear expansion. In addition, the adherend having a small coefficient of linear expansion is not particularly limited, and examples thereof include a glass plate (linear expansion coefficient: 0.3 × 10 ^-5 to 0.8 × 10 ^-5 / ° C), and poly (terephthalic acid). Ethylene glycol substrate (PET film, linear expansion coefficient: 1.5 × 10 ^-5 ~ 2 × 10 ^-5 / ° C) and the like. In addition, the adherend having a large coefficient of linear expansion is not particularly limited, and examples thereof include a resin substrate having a large coefficient of linear expansion, and more specifically, a polycarbonate resin substrate (PC, linear expansion) Coefficient: 7 × 10 ^-5 ~ 8 × 10 ^-5 / ° C), polymethyl methacrylate resin substrate (PMMA, coefficient of linear expansion: 7 × 10 ^-5 ~ 8 × 10 ^-5 / ° C), cyclic olefin Polymer substrate (COP, coefficient of linear expansion: 6 × 10 ^-5 to 7 × 10 ^-5 / ° C), trade name "Zeonor" (manufactured by Zeon Co., Ltd., Japan), trade name "Arton" (JSR Co., Ltd.) Manufacturing) and so on.

The adhesive sheet of the present invention is useful for bonding an adherend having a small coefficient of linear expansion to an adherend having a large coefficient of linear expansion. Specifically, the adhesive sheet of the present invention can be preferably used for bonding a glass adherend (for example, a glass plate, a chemically strengthened glass, a glass lens, or the like) to a resin substrate having a large coefficient of linear expansion.

Thus, the adhesive sheet of the present invention is useful for adhering various adherends of various materials, and is particularly useful for bonding a glass adherend to a plastic adherend. Further, the plastic adherend may be an optical film such as a plastic film having a layer of ITO (indium and tin oxide) on its surface.

Further, in addition to the surface-smoothed adherend, the adhesive sheet of the present invention is also useful for an adherend having a step on the surface. In particular, even if at least one of the glass-adhered body and the resin substrate having a large coefficient of linear expansion has a step on the surface, the adhesive sheet of the present invention has a resin-based base with a large coefficient of linear expansion for the glass-adhered body. The fitting of the material is also more useful.

For example, the adhesive sheet of the present invention is a laminate comprising a PET film (polyethylene terephthalate support), an ITO layer, and a copper wiring, and the ITO layer is patterned to be fixed to the adherend. A laminate having a structure in which a metal wiring is connected to the pattern of the ITO is preferably used. The reason for this is that the laminated body is composed of a material having different elastic modulus or linear expansion, and sometimes undulates in a high temperature environment, but the adhesive sheet of the present invention can effectively suppress the occurrence of undulations in a high temperature environment.

The adhesive sheet of the present invention can be preferably used for the manufacture of mobile electronic machines. Original Therefore, since the adhesive sheet of the present invention can suppress the occurrence of undulations in a high-temperature environment, it is possible to easily manufacture a mobile electronic device having a good appearance of the display portion. Examples of the mobile electronic device include a mobile phone, a PHS (Personal Handy-phone System), a smart phone, an input tablet (input tablet computer), a mobile computer (mobile PC), and action information. Mobile broadcast receivers such as terminals (PDAs), electronic notebooks, mobile TVs or mobile radios, mobile game consoles, portable music players, portable DVD players, digital cameras, etc. Model video cameras, etc.

The adhesive sheet of the present invention can be preferably used, for example, for attaching members or modules of a mobile electronic device to each other, or for fixing a member or module of a mobile electronic device to a housing. More specifically, the cover glass or the lens (especially the glass lens) and the touch panel or the touch sensor, the cover glass or the lens (especially the glass lens) is fixed to the housing, and the display panel Fixing to the housing, fixing of the input device such as a tablet keyboard or a touch panel to the housing, bonding of the protective panel of the information display unit to the housing, bonding of the housings, and housing and decorative sheets The fixing or conforming of various components or modules constituting the mobile electronic device. In the present specification, the display panel refers to a structure composed of at least a lens (particularly a glass lens) and a touch panel. Further, the lens in the present specification includes both the concept of a transparent body that exhibits the refraction of light and a transparent body that does not have a refractive effect. That is, the lens in this specification also includes a window panel that has no refractive effect.

Further, the adhesive sheet of the present invention can be preferably used for optical purposes. That is, the adhesive sheet of the present invention is preferably an optical adhesive sheet used in optical applications. More specifically, for example, it is preferably used for bonding an optical member (optical member bonding application) or a manufacturing article (optical product) using the above optical member.

[3. Optical components]

The optical member of the present invention is an optical member having at least the adhesive sheet and the substrate, and the substrate includes metal wiring (for example, copper wiring) on at least one surface, and the surface of the substrate having the metal wiring is adhered to the surface. Adhesive layer (optics of the invention) The adhesive layer may be used, and other aspects are not particularly limited. Further, the adhesive sheet may be provided with a spacer on the adhesive surface until the time of use, and the adhesive sheet in the optical member of the present invention is an adhesive sheet in use, and thus does not have a spacer.

In view of obtaining a more excellent anti-corrosion effect, the optical member preferably has the adhesive layer on the opposite side of the substrate having the metal wiring side, and further preferably has the metal wiring on the substrate. The above adhesive layer is adhered to the opposite side of the side.

The material constituting the metal wiring is not particularly limited, and examples thereof include titanium, ruthenium, iridium, indium, zinc, tin, gold, silver, copper, aluminum, cobalt, chromium, nickel, lead, iron, palladium, and platinum. Tungsten, zirconium, hafnium, tantalum and other metals. Further, an alloy containing two or more of these metals or an alloy containing the metals as a main component may be mentioned. Among them, in terms of conductivity, gold, silver, and copper are preferable, and copper is more preferable in terms of conductivity and cost. That is, the above metal wiring is particularly preferably a copper wiring. Furthermore, the material of the metal wiring constituting the touch panel described below is also the same.

The optical member refers to a member having optical characteristics (for example, polarization, light refraction, light scattering, light reflectivity, light permeability, light absorptivity, light refraction, 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 used in the devices, and examples thereof include polarized light. Plate, wave plate, phase difference plate, optical compensation film, brightness enhancement film, light guide plate, reflective film, anti-reflection film, hard coating film (film for at least one side of plastic film such as PET film) a conductive film (for example, a plastic film having an ITO layer on the surface (preferably an ITO film such as PET-ITO, polycarbonate, or cycloolefin polymer), a design film, a decorative film, a surface protective plate, a crucible, a lens, a 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 in which these layers are laminated (sometimes referred to as such "Functional film"). Moreover, the films may also have a metal nanowire layer or be electrically conductive Polymer layer, etc. Further, on these films, the fine metal wires can also be screen printed. In addition, the "plate" and the "film" respectively include a plate shape, a film shape, a sheet shape, and the like. For example, the "polarization film" includes a "polarizing plate" and a "polarizing plate". Further, the "film" includes a film sensor or the like.

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 a substrate (for example, a sheet of glass, acrylic resin, polycarbonate, polyethylene terephthalate, cycloolefin polymer, or metal thin film). , film or plate-shaped substrate, etc.). Further, in the "optical member" of the present invention, as described above, a member (design film, decorative film or surface protective film, etc.) that holds the visibility of the display device or the input device and is responsible for decoration or protection is also included.

If the adhesive sheet of the present invention is an adhesive sheet with a base material and the adhesive sheet constitutes a member having optical characteristics, the above-mentioned base material can be treated in the same manner as the above-mentioned substrate, and the above-mentioned adhesive sheet is also considered to be an optical member of the present invention.

The adhesive sheet of the present invention is an adhesive sheet with a base material. When the functional film is used as the substrate, the adhesive sheet of the present invention can also be used as the adhesive on at least one side of the functional film. "Adhesive functional film" of the layer.

Next, a specific example of a particularly preferable aspect of the optical member of the present invention will be described with reference to the schematic view of Fig. 1.

In FIG. 1(A), an optical member 1 having at least an optical member as a substrate of the adhesive sheet 10 and the transparent conductive film 11 is provided, and the transparent conductive film 11 has a metal wiring 3 on one side, and the adhesive sheet 10 is attached. It is bonded to the surface of the transparent conductive film 11 having the side of the metal wiring 3.

In FIG. 1(B), an optical member 1 having at least an optical member as a substrate of the adhesive sheet 10 and the transparent substrate 12 is described, and the transparent substrate 12 has metal wiring on one side. 3. The adhesive sheet 10 is bonded to the surface of the transparent substrate 12 having the side of the metal wiring 3.

In Fig. 1(C), there is described an optical member 1 having at least an optical member as a substrate of the adhesive sheet 10 and the film sensor 13, and the film sensor 13 has a metal wiring 3 on one side to make an adhesive sheet. 10 is attached to the surface of the film sensor 13 having the side of the metal wiring 3.

[4. Touch Panel]

The touch panel of the present invention is not limited to a touch panel having at least the adhesive sheet and the substrate, and the substrate is provided with metal wiring (for example, copper wiring) on one surface, and is adhered to a surface of the substrate having the metal wiring side. The above adhesive layer may be used, and other aspects are not particularly limited. Furthermore, the above-mentioned adhesive sheet in the touch panel of the present invention is an adhesive sheet in use, and thus has no spacer.

As the touch panel, it is preferable that the optical member of the present invention and the other optical member (which may have the above-mentioned adhesive sheet or the above-mentioned adhesive sheet have a more excellent anticorrosive effect). The adhesive sheet has the above-mentioned adhesive sheet). Further, the other optical member may be singular or plural.

The aspect in which the optical member of the present invention is bonded to the other optical member in the case of the above-described aspect is not particularly limited, and examples thereof include (1) the optical device of the present invention via the adhesive sheet of the present invention. a state in which the member is bonded to the other optical member, (2) a state in which the adhesive sheet of the present invention comprising or constituting the optical member is attached to the other optical member, and (3) an adhesive sheet according to the present invention. The optical member is attached to a member other than the optical member, and (4) the adhesive sheet of the present invention comprising or constituting the optical member is attached to a member other than the optical member. Further, in the aspect of the above (2), the adhesive sheet of the present invention is preferably a double-sided adhesive sheet in which the substrate is an optical member (for example, an optical film or the like).

Next, a specific example of a particularly preferred aspect of the touch panel of the present invention will be described with reference to the schematic diagram of FIG.

2(A), there is described a touch having a transparent substrate 12a, an adhesive sheet 10a, a transparent conductive film 11, an adhesive sheet 10b, and a transparent substrate 12b in a state of being connected to each other in the following order. Panel 2. The transparent conductive film 11 is provided with a metal wiring 3 on the surface on the side of the adhesive sheet 10a, and the adhesive sheet 10a is bonded to the surface of the transparent conductive film 11 on the side having the metal wiring 3. The transparent substrate 12a and the transparent substrate 12b are preferably glass, and the transparent conductive film 11 is preferably PET-ITO. The adhesive sheet 10b may be the adhesive sheet of the present invention or may not be the adhesive sheet of the present invention, but is preferably an adhesive sheet of the present invention.

2(B), the touch panel 2 having the transparent substrate 12a, the adhesive sheet 10, the polarizing plate 14a, the transparent substrate 12b, and the polarizing plate 14b in the state which mutually connected in the following order is described. The transparent substrate 12a is provided with a metal wiring 3 on the surface of the adhesive sheet 10, and the adhesive sheet 10 is bonded to the surface of the transparent substrate 12a on the side having the metal wiring 3. The transparent substrate 12a is preferably a cover glass sensor, and the transparent substrate 12b is preferably a glass display panel such as an LCD.

2(C), it is described that the transparent substrate 12a, the adhesive sheet 10a, the film sensor 13, the adhesive sheet 10b, the polarizing plate 14a, the transparent substrate 12b, and the polarizing plate 14b are touched in a state of being connected to each other in the following order. Control panel 2. The film sensor 13 is provided with a metal wiring 3 on the surface on the side of the adhesive sheet 10a, and the adhesive sheet 10a is bonded to the surface of the film sensor 13 on the side having the metal wiring 3. The transparent substrate 12a is preferably glass, and the transparent substrate 12b is preferably a glass display panel such as an LCD. The adhesive sheet 10b may be composed of the optical adhesive layer of the present invention or may not be composed of the optical adhesive layer of the present invention, but is preferably composed of the optical adhesive layer of the present invention.

2(D), it is described that the transparent substrate 12a, the adhesive sheet 10a, the film sensor 13, the adhesive sheet 10b, the hard coat film 15, the adhesive sheet 10c, the polarizing plate 14a, and the transparent are provided in a state of being connected to each other in the following order. The substrate 12b and the touch panel 2 of the polarizing plate 14b. The film sensor 13 is provided with a metal wiring 3 on the surface on the side of the adhesive sheet 10a, and the adhesive sheet 10a is bonded to the surface of the film sensor 13 on the side having the metal wiring 3. The transparent substrate 12a is preferably glass, the transparent substrate 12b is preferably a glass display panel such as an LCD, and the hard coat film 15 is preferably a hard-coated PET film. The adhesive sheets 10b and 10c may be composed of the optical adhesive layer of the present invention or may not be composed of the optical adhesive layer of the present invention, but are preferably provided by the optical adhesive layer of the present invention. Composition.

2(E), the optical member 4 including the transparent substrate 12a, the adhesive sheet 10a, the film sensor 13, the adhesive sheet 10b, and the hard coat film 15 in a state of being connected to each other in the following order is described as follows: The touch panel 2 of the optical member 5 of the polarizing plate 14a, the transparent substrate 12b, and the polarizing plate 14b is connected in order. The optical member 4 and the optical member 5 have a positional relationship in which the hard coat film 15 and the polarizing plate 14a are opposed to each other. The hard coat film 15 is not in contact with the polarizing plate 14a, and an air layer is formed between the hard coat film 15 and the polarizing plate 14a. The film sensor 13 is provided with a metal wiring 3 on the surface on the side of the adhesive sheet 10a, and the adhesive sheet 10a is bonded to the surface of the film sensor 13 on the side having the metal wiring 3. The transparent substrate 12a is preferably glass, the transparent substrate 12b is preferably a glass display panel such as an LCD, and the hard coat film 15 is preferably a hard-coated PET film. The adhesive sheets 10b and 10c may be composed of the optical adhesive layer of the present invention or may not be composed of the optical adhesive layer of the present invention, but are preferably composed of the optical adhesive layer of the present invention.

In addition, the metal wiring pattern (wire wiring example) is not particularly limited, and examples thereof include a metal wiring pattern shown in FIG. 7 . Fig. 7 is a plan view showing an example of a metal wiring pattern. In Fig. 7, 71a to 76a are metal wirings (pattern wirings), 71b to 76b are metal wirings (pattern wirings), and 81 to 86 series electrodes (transparent electrodes). Each electrode is connected to a metal wiring. For example, the electrode 81 is connected to the metal wiring 71a and the metal wiring 72b. Further, in Fig. 7, although the electrodes are patterned into a short strip shape, the shape of the electrodes is not limited to the short strip shape. Further, in FIG. 7, each electrode is connected to the metal wiring at two locations, and the number of connection portions of the metal wiring in the electrode is not particularly limited. For example, the electrode may be connected to the metal wiring at one location, or may be connected to the metal wiring at three or more locations. Further, the metal wiring may be connected to a control mechanism such as an IC as needed.

The method for forming the metal wiring pattern is not particularly limited, and examples thereof include a method of removing a metal layer provided in advance by etching or the like, a printing method, and the like.

[Examples]

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited by the examples.

(Production Example 1 of Acrylic Polymer)

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

Further, the weight average molecular weight (Mw) of the acrylic polymer (B-1) was 5.1 × 10 ³ .

[Example 1]

a sheet consisting of 68 parts by weight of 2-ethylhexyl acrylate (2EHA), 14.5 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 17.5 parts by weight of 2-hydroxyethyl acrylate (HEA). In the mixture, 0.035 parts by weight of a photopolymerization initiator (trade name "Irgacure 184", manufactured by BASF Corporation) and 0.035 parts by weight of a photopolymerization initiator (trade name "Irgacure 651", manufactured by BASF Corporation) were added to the mixture. The viscosity (BH viscometer No. 5 rotor, 10 rpm, measurement temperature 30 ° C) is about 20 Pa. Up to s, a prepolymer composition in which one of the above monomer components is partially polymerized is obtained.

Next, 5 parts by weight of the above acrylic polymer (B-1), 0.075 parts by weight of hexanediol diacrylate (HDDA), and a decane coupling agent (trade name "KBM-" were added to 100 parts by weight of the prepolymer composition. 403", manufactured by Shin-Etsu Chemical Co., Ltd.), 0.3 parts by weight, and 0.05 parts by weight of 1,2,3-benzotriazole (trade name "BT-120", manufactured by Seongbuk Chemical Industry Co., Ltd.), and mixed Adhesive composition (pre-hardening composition).

The adhesive composition was applied to a polyethylene terephthalate (PET) separator (trade name "MRF50", manufactured by Mitsubishi Plastics Co., Ltd.) so that the final thickness (thickness of the adhesive layer) was 100 μm. A coating layer (adhesive composition layer) is formed thereon. Then, a PET separator (trade name "MRF38", manufactured by Mitsubishi Plastics Co., Ltd.) was placed on the coating layer, and the coating layer was coated to block oxygen. Further, a laminate of MRF50/coating layer (adhesive composition layer)/MRF38 was obtained.

Then, the laminated body was irradiated with ultraviolet light having an illuminance of 5 mW/cm ² for 300 seconds from the upper surface (MRF38 side) of the laminated body by Black Light (manufactured by Toshiba Co., Ltd.). Further, the residual monomer was volatilized by drying in a dryer at 90 ° C for 2 minutes. Further, a substrate-free double-sided adhesive sheet comprising only the adhesive layer and protecting both sides of the adhesive layer with a separator was obtained.

[Embodiment 2]

A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of 1,2,3-benzotriazole used was changed to 0.1 part by weight.

[Example 3]

A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of 1,2,3-benzotriazole used was changed to 0.2 part by weight.

[Example 4]

A substrate-free double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of the 1,2,3-benzotriazole used was 0.3 parts by weight, and the thickness of the adhesive layer was changed to 50 μm. .

[Example 5]

A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of the 1,2,3-benzotriazole used was 0.3 parts by weight.

[Embodiment 6]

The amount of 1,2,3-benzotriazole used is set to 0.3 parts by weight, and the thickness of the adhesive layer is set. A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that it was 150 μm.

[Embodiment 7]

A substrate-free double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of the 1,2,3-benzotriazole used was 0.3 parts by weight, and the thickness of the adhesive layer was 250 μm. .

[Embodiment 8]

A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of 1,2,3-benzotriazole used was changed to 0.5 part by weight.

[Embodiment 9]

A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of the 1,2,3-benzotriazole used was 2.0 parts by weight.

[Embodiment 10]

In place of 1,2,3-benzotriazole, 0.5 parts by weight of 5-methylbenzotriazole (trade name "5M-BTA", manufactured by Seongbuk Chemical Industry Co., Ltd.) was used, and Example 1 was used. A substrateless double-sided adhesive sheet was obtained in the same manner.

[Example 11]

Instead of 1,2,3-benzotriazole, 0.5 parts by weight of 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole (trade name "BT-LX", A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that manufactured by Seongbuk Chemical Industry Co., Ltd.).

[Embodiment 12]

Instead of 1,2,3-benzotriazole, 0.5 parts by weight of 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole (trade name "TT-LX" is used. A substrate-free double-sided adhesive sheet was obtained in the same manner as in Example 1 except that, manufactured by Seongbuk Chemical Industry Co., Ltd.

[Example 13]

The amount of 1,2,3-benzotriazole used is set to 0.3 parts by weight, and the above monomer mixture is used. The composition is 61 parts by weight of 2-ethylhexyl acrylate (2EHA), 14 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 25 parts by weight of 4-hydroxybutyl acrylate (4HBA), and A substrate-free double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of hexanediol diacrylate (HDDA) was 0.060 parts by weight.

[Embodiment 14]

A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that the amount of 1,2,3-benzotriazole used was changed to 5.0 parts by weight.

[Example 15]

The amount of 1,2,3-benzotriazole used was 0.5 parts by weight, and the composition of the above monomer mixture was set to 2-ethylhexyl acrylate (2EHA) without using the acrylic polymer (B-1). In the same manner as in Example 1, except that 78 parts by weight, 18 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 4 parts by weight of 2-hydroxyethyl acrylate (HEA) were used. The substrate is double-sided adhesive sheet.

[Example 16]

The amount of 1,2,3-benzotriazole (trade name "BT-120", manufactured by Seongbuk Chemical Industry Co., Ltd.) was 0.3 part by weight, and hexanediol diacrylate (HDDA) was 0.250 parts by weight. An adhesive composition (pre-hardening composition) was obtained in the same manner as in Example 1.

Further, using this composition, a substrate-free double-sided adhesive sheet comprising only the adhesive layer and protecting both sides of the adhesive layer with a separator was obtained in the same manner as in Example 1.

[Example 17]

61 parts by weight of 2-ethylhexyl acrylate (2EHA), 14 parts by weight of N-vinyl-2-pyrrolidone (NVP), 3 parts by weight of 2-hydroxyethyl acrylate (HEA), and acrylic acid 4- A prepolymer composition in which one of the above monomer components was partially polymerized was obtained in the same manner as in Example 1 except that the monomer mixture of 22 parts by weight of hydroxybutyl ester (4HBA) was used.

Next, hexanediol diacrylate is added to 100 parts by weight of the prepolymer composition. (HDDA) 0.180 parts by weight, a decane coupling agent (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.) 0.3 parts by weight, and 1,2,3-benzotriazole (trade name "BT-120" 0.3 parts by weight manufactured by Seongbuk Chemical Industry Co., Ltd. and mixed to obtain an adhesive composition (pre-cured composition).

Further, using the adhesive composition, a substrate-free double-sided adhesive sheet comprising only the adhesive layer and protecting both sides of the adhesive layer with a separator was obtained in the same manner as in Example 1.

[Embodiment 18]

61 parts by weight of 2-ethylhexyl acrylate (2EHA), 14 parts by weight of N-vinyl-2-pyrrolidone (NVP), 3 parts by weight of 2-hydroxyethyl acrylate (HEA), and acrylic acid 4- A prepolymer composition in which one of the above monomer components was partially polymerized was obtained in the same manner as in Example 1 except that the monomer mixture of 22 parts by weight of hydroxybutyl ester (4HBA) was used.

Next, 0.060 parts by weight of hexanediol diacrylate (HDDA) and 0.3 parts by weight of a decane coupling agent (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.) were added to 100 parts by weight of the prepolymer composition. And 0.3 parts by weight of 1,2,3-benzotriazole (trade name "BT-120", manufactured by Seongbuk Chemical Industry Co., Ltd.) and mixed to obtain an adhesive composition (pre-cured composition).

Further, using this composition, a substrate-free double-sided adhesive sheet comprising only the adhesive layer and protecting both sides of the adhesive layer with a separator was obtained in the same manner as in Example 1.

[Comparative Example 1]

A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that 1,2,3-benzotriazole was not used.

[Comparative Example 2]

Instead of 1,2,3-benzotriazole, 0.5 parts by weight of pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (trade name "Irganox 1010") is used. A substrateless double-sided adhesive sheet was obtained in the same manner as in Example 1 except that manufactured by BASF Corporation.

[Comparative Example 3]

Without using 1,2,3-benzotriazole, without using the acrylic polymer (B-1), the composition of the above monomer mixture was made into 90 parts by weight of 2-ethylhexyl acrylate (2EHA) and acrylic acid ( AA) A substrate-free material was obtained in the same manner as in Example 1 except that 10 parts by weight of the pentylene glycol diacrylate (HDDA) was used in an amount of 0.075 parts by weight and 0.070 parts by weight of dipentaerythritol hexaacrylate (DPHA) was used. Double-sided adhesive sheet.

[Comparative Example 4]

The amount of 1,2,3-benzotriazole used was 0.5 parts by weight, and the composition of the above monomer mixture was set to 2-ethylhexyl acrylate (2EHA) without using the acrylic polymer (B-1). 90 parts by weight and 10 parts by weight of acrylic acid (AA), and 0.070 parts by weight of dipentaerythritol hexaacrylate (DPHA) was used instead of 0.075 parts by weight of hexanediol diacrylate (HDDA), and the same as Example 1 A substrateless double-sided adhesive sheet was obtained in the same manner.

[Comparative Example 5]

60 parts by weight of lauryl acrylate (LA), 22 parts by weight of 2-ethylhexyl acrylate (2EHA), 10 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 4-hydroxybutyl acrylate A prepolymer composition in which one of the above monomer components was partially polymerized was obtained in the same manner as in Example 1 except that the monomer mixture composed of (4HBA) was used.

Next, 0.035 parts by weight of dipentaerythritol hexaacrylate (DPHA) and 0.3 parts by weight of a decane coupling agent (trade name "KBM-403", manufactured by Shin-Etsu Chemical Co., Ltd.) were added to 100 parts by weight of the prepolymer composition. And mixing to obtain an adhesive composition (pre-hardening composition).

Further, using this composition, a substrate-free double-sided adhesive sheet comprising only the adhesive layer and protecting both sides of the adhesive layer with a separator was obtained in the same manner as in Example 1.

[Comparative Example 6]

The amount of 1,2,3-benzotriazole used is set to 0.3 parts by weight, and the above monomer mixture is used. The composition is 60 parts by weight of lauryl acrylate (LA), 22 parts by weight of 2-ethylhexyl acrylate (2EHA), 10 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 4-hydroxybutyl acrylate. The same procedure as in Example 1 was carried out except that 8 parts by weight of the ester (4HBA) was used, and 0.035 parts by weight of dipentaerythritol hexaacrylate (DPHA) was used instead of 0.075 parts by weight of hexanediol diacrylate (HDDA). The substrate is double-sided adhesive sheet.

[Feature evaluation]

The following measurement or evaluation was performed on the substrate-free double-sided adhesive sheets of the examples and the comparative examples. The evaluation results are shown in Table 2.

(1) Metal corrosion

A substrate surface side peeling film (hereinafter sometimes referred to as "copper film") provided with a copper layer on one surface of a cycloolefin (COP) substrate (trade name "Zeonor", manufactured by Zeon Co., Ltd., thickness: 100 μm) The separator on one side of the double-sided adhesive sheet is bonded to the 2kg roller and crimped under the pressure of 2 times, and is bonded to obtain a structure having a laminated structure of a copper film and a double-sided adhesive sheet. A.

Next, after the structure A was cut out to a size of 15 mm × 15 mm, the separator of the double-sided adhesive sheet was peeled off, and crimped under a pressure of 2 kg of a roll and reciprocated once to bond it to a soda glass plate (25 mm × 25mm, thickness 0.7mm). Further, a structure B having a laminated structure of a copper film, a double-sided adhesive sheet, and glass was obtained.

In addition, a film having an anti-reflection treatment layer is provided on one surface of a triacetin (TAC) substrate (trade name "DSC-03", manufactured by Dainippon Printing Co., Ltd., thickness 90 μm, or sometimes referred to as "AR" On the substrate surface side of the film "), the separator on one side of the double-sided adhesive sheet which is the same as the above is peeled off, and the double-sided adhesive sheet is pressure-bonded under a pressure condition of 2 kg of the roll and reciprocated once to obtain a film. A structure C having a laminated structure of an AR film and a double-sided adhesive sheet. Next, after the structure C was cut out to a size of 10 mm × 10 mm, the separator of the double-sided adhesive sheet was peeled off, and the copper was bonded to the structure B under a pressure of 2 kg of the roll and crimped once. The central part of the face side is obtained with an AR film, a double-sided adhesive sheet, a copper film, a double-sided adhesive sheet, and a glass Structure D of a five-layer laminated structure of glass.

After leaving to stand in an environment of 23 ° C and 50% RH for 30 minutes, the structure D was placed in an autoclave, and autoclaved at 15 ° C for 15 minutes under the conditions of a temperature of 50 ° C and a pressure of 0.5 MPa. After the autoclave treatment, the structure D was taken out from the autoclave and left in an environment of 23 ° C and 50% RH (RH: relative humidity) for 24 hours.

As a device for measuring the sheet resistance value of the copper layer of the above-mentioned structure D, a Hall effect measuring device (trade name "HL5500PC", manufactured by Toho Technology Co., Ltd.) was used. The sheet resistance value (initial sheet resistance: R ₀ ) of the above-mentioned structure D was measured in an environment of 23 ° C and 50% RH.

After the measurement, in order to prevent oxidation of copper which is in contact with the measurement probe, the surface of the copper of the structure of the above-mentioned structure D which is not attached with the AR film was placed in an environment of 85 ° C and 85% RH for 300 hours. After taking out, the temperature was adjusted and the humidity was adjusted for 24 hours in an environment of 23 ° C and 50% RH. The sheet resistance value (the sheet resistance after the test: R ₁ ) was measured under the conditions of 23 ° C and 50% RH, respectively, after visually confirming the color change from the initial copper.

The change in the sheet resistance value was obtained from the initial sheet resistance value (R ₀ ) and the value of the sheet resistance value (R ₁ ) after the test after 300 hours at 85 ° C and 85% RH. Rate T.

Rate of change T(%)=(R ₁ -R ₀ )/R ₀ ×100

When the rate of change T of the sheet resistance value is less than 150%, it is judged to have good corrosion resistance by passing ("○"). On the other hand, if the rate of change from the initial resistance value is 150% or more, it is judged to be unacceptable ("X"), and it is judged that it does not have good corrosion resistance.

(2) Total light transmittance and haze

The double-sided adhesive sheet was peeled off from the double-sided adhesive sheet, and the double-sided adhesive sheet was attached to a glass slide ("White Grinding No. 1" manufactured by Songlang Glass Industry Co., Ltd., thickness 0.8-1.0 mm, total light transmission The rate is 92%, the haze is 0.2%), and the separator on the other side is peeled off. A test piece having a layer of a double-sided adhesive sheet (adhesive layer)/slide was used.

The total light transmittance and haze of the test piece in the visible light region were measured by a haze meter (device name "HM-150", manufactured by Murakami Color Research Co., Ltd.).

(3) 180° peeling adhesion force (180° peeling adhesion force to glass plate)

A sheet having a length of 100 mm and a width of 20 mm was cut out from the double-sided adhesive sheet. Then, the separator was peeled off from the sheet, and a PET film (trade name "Lumirror S-10", thickness 25 μm, manufactured by Toray Industries, Inc.) was attached. Next, the separator on the other side was peeled off, and it was crimped to the test plate under a pressure condition of 2 kg of rolls and one round trip. Thereafter, it was aged for 30 minutes in an environment of 23 ° C and 50% RH. After aging, a tensile tester (device name "Autograph AG-IS", manufactured by Shimadzu Corporation) was used and peeled off at a tensile speed of 300 mm/min in an environment of 23 ° C and 50% RH in accordance with JIS Z0237. The adhesive sheet was peeled off from the test plate at an angle of 180°, and the 180° peeling adhesion force (N/20 mm) was measured.

The test plate was a glass plate (trade name "soda lime glass #0050", manufactured by Matsunaga Glass Industry Co., Ltd.).

(4) Humidification resistance

After cutting the double-sided adhesive sheet to a size of 45 mm in width and 90 mm in length, the separator on one side was peeled off, and pressed under a pressure condition of 2 kg of rolls and one round trip to adhere to the soda glass plate (Songlang Glass Industry) Made by the company, 100mm × 50mm, thickness 0.7mm). Next, the self-adhesive double-sided adhesive sheet peeling separator is bonded to the same glass plate as above by a vacuum bonding apparatus under the conditions of a surface pressure of 0.2 MPa, a vacuum of 30 Pa, and a bonding time of 10 seconds. Evaluation sample of glass/double-sided adhesive sheet/glass composition.

Next, the above evaluation sample was placed in an autoclave, and autoclave treatment was carried out for 15 minutes under the conditions of a temperature of 50 ° C and a pressure of 0.5 MPa. After the autoclave treatment, the evaluation sample was taken out and allowed to stand in an environment of 23 ° C, 50% RH (RH: relative humidity) for 24 hours.

After the evaluation sample was put into a high temperature and high humidity environment of 60 ° C and 95% RH for 300 hours, After taking out, it was allowed to stand in an environment of 23 ° C and 50% RH for 24 hours, and thereafter, the appearance of the sample was evaluated by visual observation, and the humidification resistance was evaluated in accordance with the following evaluation criteria.

Evaluation basis

A: No whitening

B: Whitening is visible only at the four corners of the double-sided adhesive sheet.

C: whitening is visible on the entire surface of the double-sided adhesive sheet

(5) Foam resistance peeling resistance

The separator on one side of the double-sided adhesive sheet was peeled off, and the double-sided adhesive sheet was pressure-bonded under a pressure of 2 kg of the roll to be bonded to a cyclic olefin (COP) substrate (trade name "Zeonor" The film on the ITO layer side of a film of ITO (indium and tin oxide) layer (hereinafter sometimes referred to as "COP-ITO film") is provided on one surface of a surface manufactured by Zeon Co., Ltd. and having a thickness of 100 μm. Further, a structure A' having a laminated structure of a COP-ITO film and a double-sided adhesive sheet was obtained.

Next, the separator of the double-sided adhesive sheet in the structure A' was peeled off, and the structure A' was pressure-bonded under a pressure condition of 2 kg of rolls and reciprocating once to adhere to the glass of the difference (Fig. 4 ~6 refers to the side of the side with the step difference. Further, a structure B' having a laminated structure of a COP-ITO film, a double-sided adhesive sheet, and a glass having a step difference was obtained.

After the structure B' was allowed to stand in an environment of 23 ° C and 50% RH for 1 hour, the structure B' was placed in an autoclave and autoclaved for 15 minutes under the conditions of a temperature of 50 ° C and a pressure of 0.5 MPa. After the autoclave treatment, the structure B' was taken out from the autoclave, and the structure B' was placed in a dryer set at 85 ° C and left for 24 hours.

Thereafter, the structure B' was taken out from the dryer and left in an environment of 23 ° C and 50% RH for 30 minutes. Further, the presence or absence of foaming (including foaming by foaming by foreign matter) or peeling of the structure B' was confirmed by a microscope. And, the evaluation is performed according to the following evaluation criteria.

Evaluation basis

A: No foaming or peeling at all

B: It can be seen that foaming is caused only by foreign matter having a size of 100 μm or more.

C: foaming caused by foreign matter up to 100 μm in size

D: Foaming or peeling can be seen with or without foreign matter

Further, the evaluation of the above (5) foam-resistant peeling property is also directed to the use of ITO (indium and tin) on one side of a polyethylene terephthalate (PET) substrate (thickness: 50 μm) instead of the COP-ITO film. The film of the oxide layer (hereinafter sometimes referred to as "PET-ITO film") is carried out.

(6) Visual assessment of the pattern

Film thickness (23 μm biaxially oriented polyethylene terephthalate (PET) film, trade name "Diafoil", manufactured by Mitsubishi Plastics Co., Ltd.) was used to form a film by sputtering. A 22 nm ITO film (ITO layer) was obtained by forming a film (ITO film) on which an ITO film was formed on one surface of the film substrate.

Next, the ITO film was cut into a sheet having a width of 6 cm and a length of 10 cm. A plurality of polyimine tapes having a width of 2 mm were attached to the surface of the cut ITO film at intervals of 2 mm. The bonding of the polyimide lens is performed in such a manner that the longitudinal direction of the polyimide tape is the same as the width direction of the cut ITO film. After bonding the polyimide tape, it was immersed in a 5 wt% aqueous hydrochloric acid solution heated to 50 ° C for 10 minutes. This immersion corresponds to an etching treatment for the purpose of removing the ITO film which is not shielded (the portion which is not bonded to the polyimide tape). After immersing in a 5 wt% aqueous hydrochloric acid solution, it was washed with water by immersion in a sufficient amount of pure water, and the polyimide tape was slowly peeled off.

Further, the film was dried by heating in an oven at 70 ° C for 5 minutes to obtain a film (ITO pattern film) having a patterned ITO film.

The ITO pattern film has a pattern forming portion in which an ITO film is formed and a pattern opening portion in which the ITO film is removed.

The copper wiring is provided so as to be connected to the peripheral edge portion of the surface on which the ITO pattern is formed and the end portion of each pattern from the peripheral edge portion, and then the glass plate is bonded to the surface via the double-sided adhesive sheet. Test piece (with ITO with glass plate / double-sided adhesive sheet / copper wiring) a laminate of a laminated structure of a pattern film).

In addition, the copper wiring system provided so as to be connected to the peripheral edge portion of the surface on which the ITO pattern is formed and the end portion of each pattern from the peripheral edge portion corresponds to the aspect shown in FIG.

Next, the above test piece was allowed to stand in an environment of 85 ° C and 85% RH for 48 hours. For the test piece after the placement, the visibility of the pattern was visually confirmed, and evaluation was performed according to the following evaluation criteria.

Evaluation basis

Very good (◎): It is difficult to distinguish the pattern forming portion from the pattern opening portion, and almost no pattern is seen.

Good (○): The pattern forming portion and the pattern opening portion can be slightly distinguished, and the pattern is slightly visible.

Poor (X): The pattern forming portion and the pattern opening portion can be clearly distinguished, and the pattern is clearly visible.

[Industrial availability]

According to the optical adhesive layer of the present invention, it is possible to provide reliability, transparency, and corrosion resistance, and to suppress occurrence of undulation in a high-temperature environment, and it is possible to reduce the number of steps without applying a protective layer, and as a result, the cost is lowered. Since the yield is improved, it is useful for display devices such as liquid crystal displays (LCDs), input devices such as touch panels, and particularly touch panels.

1‧‧‧Optical components

3‧‧‧Metal wiring

10‧‧‧Adhesive tablets

11‧‧‧Transparent conductive film

12‧‧‧Transparent substrate

13‧‧‧Film sensor

Claims (14)

An optical adhesive layer comprising a base polymer and a rust preventive agent, wherein the base polymer as a monomer component of the composition does not contain or substantially does not contain an acid group-containing monomer, and the elasticity at 85 ° C The modulus is 5.0 × 10 ⁴ Pa or more. An optical adhesive layer comprising an acrylic polymer (A) and a rust preventive agent, and the acrylic polymer (A) as a monomer component of the composition does not contain or substantially does not contain a carboxyl group-containing monomer The modulus of elasticity at 85 ° C is 5.0 × 10 ⁴ Pa or more. The optical adhesive layer according to claim 2, which contains 5 parts by weight or more of the hydroxyl group-containing monomer based on the total amount (100 parts by weight) of the monomer components constituting the acrylic polymer (A). The optical pressure-sensitive adhesive layer according to claim 2 or 3, which contains 5 parts by weight or more of the monomer containing a nitrogen atom, based on the total amount of the monomer component (100 parts by weight) constituting the acrylic polymer (A). The optical adhesive layer according to any one of claims 1 to 4, wherein the rust inhibitor is a benzotriazole compound. The optical adhesive layer according to any one of claims 1 to 5, which has a haze (according to JIS K7136) of 1.0% or less. The optical adhesive layer according to any one of claims 1 to 6, which has a total light transmittance (according to JIS K7361-1) of 90% or more. An adhesive sheet having the optical adhesive layer according to any one of claims 1 to 7. The adhesive sheet of claim 8 has a 180° peeling adhesion force to the glass sheet of 8 N/20 mm or more. The adhesive sheet of claim 8 or 9 has a thickness of 12 to 350 μm. An optical member having at least the adhesive sheet according to any one of claims 8 to 10. And the substrate, wherein the substrate has metal wiring on at least one side, and the adhesive sheet is adhered to a surface of the substrate on the side having the metal wiring. The optical member of claim 11, wherein the metal wiring is a copper wiring. A touch panel having at least one of the adhesive sheets and the substrate according to any one of claims 8 to 10, wherein the substrate has metal wiring on at least one side thereof on a side of the substrate having the metal wiring side Adhered to the above adhesive sheet. The touch panel of claim 13, wherein the metal wiring is a copper wiring.