TW201305299A - Adhesive, adhesive sheet and laminated body for touch panel - Google Patents

Abstract

The present invention provides an adhesive for a touch panel, which is formed of metal or metal oxide, has excellent heat resistance, heat and humidity resistance stability, uneven-following capability, and has no corrosivity to the metal or metal oxide, an adhesive sheet and a laminated body use the same. The present adhesive includes: an acrylic copolymer (A), 0.1 to 5 parts by weight of an aliphatic isocyanate cross-link agent (B) with respect to 100 parts by weight of the acrylic copolymer (A), The acrylic copolymer (A) substantially has no acidic groups and has a weight average molecular weight more than or equal to 50, 000 and less than 400, 000, which is obtained by copolymerizing monomers containing the following components (a-1) an alkoxy (meth)acrylate 20 to 99.9 wt%, and (a-2) 0.1 to 10 wt% of a monomer having cross-linkable functional groups.

Description

Adhesive, adhesive sheet and laminated body for touchpad

The present invention relates to an adhesive for a laminated body for a touch panel, an adhesive sheet for forming the adhesive into a sheet shape, and a laminated body for a touch panel for attaching a member using the adhesive sheet.

The touch panels used in the current mainstream are roughly classified into a resistive touch panel and a capacitive touch panel, and these are laminated bodies of various materials, and the adhesive mainly uses an acrylic adhesive. Since the touch panel unit is disposed on the outermost surface of the screen, high transparency is required, and further, it is required to have characteristics such as high heat resistance and moist heat resistance. Specifically, the touch panel unit is a laminated body of various materials and is disposed on the outermost surface of the touch panel device, so that it may be whitened by infiltration from external moisture, and may be caused by air entrapment when attached. The foaming caused by the outgas generated by the foaming and laminating materials becomes a problem.

Further, in the resistive film type touch panel which is the mainstream of the touch panel, various adhesives can be used for attaching polycarbonate (PC) or in mold film (IMF).

However, in terms of the properties of the material of the PC, there are characteristics of outgassing at high temperature conditions, foaming under heat-resistant conditions, and difficulty in suppressing whitening of the adhesive layer generated by moisture inflow in hot and humid conditions. . Further, since the IMF has a submicron order, there is also a problem that the adhesive cannot follow the step and is caught in the bubble.

In the past, by adding an acid component to the adhesive to solve the above problem question. In other words, the acid component has a function of dispersing the mixed water so as not to precipitate, and the water permeating into the adhesive layer is dispersed in the adhesive layer without being deposited by the dispersing force of the acid component, so that the adhesive is prevented. The layer is whitened, and since hydrogen bonds are formed, the occurrence of bubbles of heat-resistant bubbling is suppressed by the high cohesive force generated by the hydrogen bonds.

Recently, with the enhancement of the function of multi-touch, the capacitive touch panel has gradually replaced the resistive touch panel and became the mainstream. In the capacitive touch panel, it is of course necessary to have the characteristics required for the resistive touch panel. However, in addition, since the adhesive is in direct contact with the conductive layer forming the wiring, the adhesive must have A property of changing the characteristics of the conductive layer. The conductive layer is formed of a metal such as indium tin oxide (ITO) or silver or a metal oxide, and is corroded by contact with an acid, and the resistance value thereof is increased. Therefore, the acid component used in the prior art is used to ensure heat resistance and moist heat resistance. Means of other characteristics cannot be used.

In the case of the corrosion of a transparent electrode made of a metal or a metal oxide such as ITO, a polymer having an alkoxyalkyl acrylate as a main component has been disclosed in Patent Document 1 (JP-A-2010-77287). In Patent Document 1, it has been disclosed to use a polymer which uses a polymer having an average weight molecular weight of 400,000 to 1,600,000 of an alkoxyalkyl acrylate-based polymer and does not use a carboxyl group-containing monomer.

Thus, 400,000 to 1,600,000 of alkoxyalkyl acrylate-based polymer is used without using a carboxyl group-containing monomer, whereby corrosion of a transparent electrode composed of a metal or a metal oxide such as ITO is already present. The degree of improvement, but the properties such as wet heat whitening, heat and foaming are not available. The effect of the points. Further, workability is also difficult to say.

Further, the weight average molecular weight of the polymer disclosed in Patent Document 1 is as large as 400,000 to 1,600,000. Therefore, when the solution is dissolved in a solvent to prepare a coating liquid, if the amount of the solid content is increased, the viscosity of the polymer solution becomes Too high. In the touch panel, an adhesive is sometimes laminated on a support having a step caused by the printing of the fore edge. In order to track the step difference, a thick film adhesive layer must be formed, and in particular, in a capacitive touch panel. In order to bring the surface support to a conductive film such as ITO, a thick film adhesive layer may be sought. However, since an alkoxyalkyl acrylate polymer having a weight average molecular weight of 400,000 to 1.6 million is used, it is impossible to prepare. A coating liquid having a high solid content and a coating liquid having a low solid content are required to be repeatedly coated, and there is a problem that it is difficult to form an adhesive layer having a desired thickness in one application.

Further, the above-mentioned adhesive may be used in the form of a transfer tape in which an adhesive layer is formed between the release films. Such a transfer tape is used by peeling off the peelable film and transferring it to a touch panel member. However, the adhesive layer of the transfer tape has formed a crosslinked structure in the adhesive layer, and has poor followability to a member having irregularities. Therefore, even if it cross-links, in order to adhere to a film or a base material, it is seeking to have moderate softness, and it is set as the adhesive sheet which the foaming which originated in the fuse|bonding at the time of bonding. Patent Document 2 describes an adhesive composition which uses an aliphatic isocyanate crosslinking agent to enhance yellowing resistance. An adhesive sheet which is cured by using an aliphatic isocyanate crosslinking agent is more excellent in flexibility than an adhesive sheet which is cured by using a crosslinking agent having an aromatic ring. However, the acrylic polymer described in Patent Document 2 has a weight average molecular weight of 400,000 or more and 1.6 million or less, which has the above problems.

Further, the surface of the polyethylene terephthalate or polycarbonate constituting the surface support of the touch panel is often subjected to a hard coat treatment. Therefore, the adhesive sheet also seeks to have good adhesion to the hard coat layer.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-77287 [Patent Document 2] Japanese Patent Laid-Open Publication No. 2010-215923

An object of the present invention is to provide an adhesive for a touch panel having a conductive film made of a metal or a metal oxide, which is excellent in heat resistance, heat and humidity stability, and step followability, and has no metal or metal oxide. A corrosive adhesive, an adhesive sheet, and a laminate for use with the touch panel.

Further, an object of the present invention is to provide an adhesive or an adhesive sheet which is excellent in workability.

The present invention is, for example, the following [1] to [29].

[1] An adhesive comprising: an acrylic polymer (A) and an aliphatic isocyanate crosslinking agent (B) in an amount of 100 parts by weight based on the acrylic polymer (A): 0.1 to 5 parts by weight; The acrylic polymer (A) contains the components (a-1) and (a-2) (a-1) alkoxylate (meth)acrylate shown below in an amount of 20 to 99.9% by weight, (a-2). 0.1 to 10% by weight of a monomer having a crosslinkable functional group The weight average molecular weight of the monomer (100% by weight of the total monomer) obtained by copolymerization without substantially having an acidic group is 50,000 or more and less than 400,000.

[2] The adhesive according to [1], wherein the aliphatic isocyanate crosslinking agent (B) has three or more isocyanate groups in one molecule.

[3] The adhesive according to [1] or [2] wherein the monomer having the crosslinkable functional group (a-2) forming the acrylic polymer (A) is a hydroxyl group-containing monomer.

[4] The adhesive according to any one of [1] to [3] wherein the acrylic polymer (A) is a monomer having a nitrogen content of 5 wt% or less (a-3) Aggregated.

[5] The adhesive according to [4], wherein the (a-3) nitrogen-containing monomer is an amino group-containing monomer, a guanamine-containing monomer, a nitrogen-containing heterocyclic monomer, and a cyano group. At least one selected from the group consisting of monomers.

[6] The adhesive according to any one of [1] to [5] wherein the adhesive is an electrostatic capacitance type touch panel adhesive which is in direct contact with a metal or a metal oxide.

[7] The adhesive according to any one of [1] to [5] wherein the adhesive is an electrostatic capacitance type touch panel that is in direct contact with a hard coat layer on a surface support of the touch panel. Adhesive.

[8] The adhesive according to [7], wherein the hard coat layer is an anthracene oxygen system.

[9] An adhesive sheet comprising an adhesive layer formed of an adhesive and having a gel fraction of 40 to 80% by weight and a thickness of 10 to 1000 μm; the adhesive comprising: acrylic polymerization Object (A), and relative to the The acrylic polymer (A) is used in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the aliphatic isocyanate crosslinking agent (B); and the acrylic polymer (A) contains the component (a-1) shown below and (a-2) (a-1) alkoxylate of (meth)acrylic acid 20 to 99.9% by weight, (a-2) monomer having a crosslinking functional group of 0.1 to 10% by weight of a monomer (in a single order) The weight average molecular weight obtained by copolymerization of 100% by weight of the compound having substantially no acidic group is 50,000 or more and less than 400,000.

[10] The adhesive sheet according to [9], wherein the aliphatic isocyanate crosslinking agent (B) has three or more isocyanate groups in one molecule.

[11] The adhesive sheet according to [9] or [10] wherein the monomer having the crosslinkable functional group (a-2) forming the acrylic polymer (A) is a hydroxyl group-containing monomer.

[12] The adhesive sheet according to any one of [9] to [11] wherein the acrylic polymer (A) is a monomer having a nitrogen content of 5% by weight or less (a-3). Aggregated.

[13] The adhesive sheet according to [12], wherein the (a-3) nitrogen-containing monomer is an amino group-containing monomer, a guanamine-containing monomer, a nitrogen-containing heterocyclic monomer, and a cyano group. At least one selected from the group consisting of monomers.

[14] The adhesive sheet according to any one of [9] to [13] wherein the adhesive for forming the adhesive sheet is an adhesive for a capacitive touch panel in direct contact with a metal or a metal oxide.

[15] The adhesive sheet according to any one of [9] to [14] wherein the adhesive forming the adhesive sheet is an electrostatic capacitive contact with a hard coating layer on a surface support of the touch panel. Adhesive for control board.

[16] The adhesive sheet of [15], wherein the hard coat layer is a ruthenium oxygen system.

[17] The adhesive sheet according to any one of [9] to [16] wherein a cover film which has been subjected to a release treatment is disposed on at least one side of the adhesive sheet.

[18] A laminated body for a touch panel, which is attached to one surface of an adhesive sheet, and has a surface supporting body printed on the edge of the surface facing the surface of the adhesive sheet, and is attached to the other side of the adhesive sheet. a transparent conductive film made of a metal or a metal oxide or a transparent conductive film made of a metal or a metal oxide; the adhesive sheet is formed of an adhesive and has a gel fraction An adhesive layer having a thickness of 40 to 80% by weight and a thickness of 10 to 1000 μm; the adhesive comprising: an acrylic polymer (A) and 100 parts by weight relative to the acrylic polymer (A) 0.1 to 5 parts by weight of the aliphatic isocyanate crosslinking agent (B); and the acrylic polymer (A) contains the components (a-1) and (a-2) (a-1) shown below ( 20 to 99.9% by weight of alkoxyalkyl methacrylate, (a-2) 0.1 to 10% by weight of a monomer having a crosslinkable functional group (100% by weight of all monomers) copolymerized The weight average molecular weight which does not substantially have an acidic group is 50,000 or more and less than 400,000.

[19] The laminated body for a touch panel according to [18], wherein the laminated body for the touch panel is a member for forming a capacitive touch panel.

[20] The laminate for a touch panel according to [18] or [19], wherein the thickness of the margin printing is in a range of 10 to 50 μm.

[21] The laminated body for a touch panel according to any one of [18] to [20], wherein The transparent conductive film is a wiring pattern using ITO, ATO, or tin oxide, and the above-mentioned adhesive sheet directly contacts the wiring pattern.

[22] The laminate for a touch panel according to any one of [18] to [21] wherein the surface support has a thickness in the range of 25 to 2000 μm.

[23] The laminate for a touch panel according to any one of [18] to [22] wherein the transparent conductive film has a thickness in the range of 10 to 100 nm.

[24] The laminate for a touch panel according to any one of [18], wherein the aliphatic isocyanate crosslinking agent (B) has three or more isocyanate groups in one molecule.

[25] The laminate for a touch panel according to any one of [18] to [24] wherein the monomer having the crosslinkable functional group (a-2) forming the acrylic polymer (A) is A hydroxyl group-containing monomer.

[26] The laminated body for a touch panel according to any one of [18], wherein the acrylic polymer (A) is a compound containing 5% by weight or less (a-3) of a nitrogen-containing monomer. The monomer is obtained by copolymerization.

[27] The laminate for a touch panel according to [26], wherein the (a-3) nitrogen-containing monomer is a monomer comprising an amine group-containing monomer, a guanamine-containing monomer, and a nitrogen-containing heterocyclic ring. At least one selected from the group consisting of cyano group-containing monomers.

[28] The laminated body for a touch panel according to any one of [18] to [27] wherein the adhesive sheet is in direct contact with a hard coat layer on a surface support of the touch panel.

[29] The laminate for a touch panel according to [28], wherein the hard coat layer is a tantalum oxygen system.

The adhesive of the present invention is effective because it does not substantially contain an acid component Deterioration caused by corrosion of wiring composed of a metal such as ITO or silver or a metal oxide is suppressed.

Further, since the weight average molecular weight (Mw) of the adhesive of the present invention is 50,000 or more and less than 400,000, the solid content can be maintained at a high concentration in a solvent, and a sufficient thick coating can be carried out in a single coating step.

Then, since the crosslinked structure is formed by the aliphatic isocyanate crosslinking agent, the adhesive of the present invention is excellent in heat resistance and moist heat stability, and has flexibility, so that the step followability is very good. Further, the adhesion to the hard-coated film was also good.

Therefore, the adhesive of the present invention, the adhesive sheet having the adhesive as an adhesive layer, and the laminated system for a touch panel using the adhesive sheet are less likely to produce a transparent conductive film composed of a metal or a metal oxide such as ITO or silver. Corrosion, further, it is also difficult to whiten and foam.

Next, a laminate for the adhesive, the adhesive sheet and the touch panel of the present invention will be specifically described.

The adhesive of the present invention is composed of an acrylic polymer (A) and an aliphatic isocyanate crosslinking agent (B).

In the present invention, the acrylic polymer (A) is a polymer obtained by copolymerizing the components (a-1) and (a-2) shown below: (a-1) alkoxylate (meth)acrylate Ester, (a-2) a monomer having a crosslinkable functional group.

Examples of the (a-1) (meth)acrylic acid alkoxylate constituting the acrylic polymer (A) used herein include, for example, methoxymethyl (meth)acrylate, Methoxyethyl (meth)acrylate, methoxypropyl (meth)acrylate, methoxybutyl (meth)acrylate, ethoxymethyl (meth)acrylate, (meth)acrylic acid Oxyethyl ester, ethoxypropyl (meth)acrylate, ethoxybutyl (meth)acrylate, methoxydiethylene glycol (meth) acrylate, ethoxy diethylene glycol (A) Acrylate, methoxytriethylene glycol (meth) acrylate, ethoxytriethylene glycol (meth) acrylate. Among these (a-1) alkoxylates of (meth)acrylic acid, methoxyethyl (meth)acrylate and methoxydiethylene glycol (meth)acrylate are preferably used. Or use in combination.

In the acrylic polymer of the present invention, the aforementioned (a-1) alkoxylate of (meth)acrylate is 20 to 99.9% by weight, preferably 30 to 99.1% by weight, more preferably 50 to 98.3. The amount by weight is copolymerized. When the (a-1) alkoxylate of (meth)acrylic acid is more than 99.9% by weight, the amount of the monomer having a functional group must be reduced, and a sufficient crosslinking density cannot be obtained. On the other hand, when it is less than 20% by weight, it is impossible to suppress water analysis during wet heat, and the adhesive layer is whitened, and the appearance is abnormal.

Further, the monomer having a crosslinkable functional group (a-2) copolymerized with the above (a-1) (meth)acrylic acid alkoxylate is preferably a hydroxyl group-containing monomer. The hydroxyl group-containing monomer is preferably a (meth) acrylate compound having a hydroxyl group as a functional group, and examples of the (meth) acrylate compound having a hydroxyl group include, for example, 2-hydroxyethyl (meth)acrylate. 2-hydroxypropyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, (A) Base) 8-hydroxyoctyl acrylate. The above (meth) acrylate compound having a hydroxyl group is preferably 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and the like (meth) propyl having a hydroxyl group. The enoate compounds can be used singly or in combination.

In the acrylic polymer (A) used in the present invention, (a-2) a single system having a crosslinkable functional group is from 0.1 to 10% by weight, preferably from 0.8 to 9% by weight, more preferably from 1.2 to Copolymerization was carried out in an amount ranging from 6 wt%.

When the amount of the monomer having a crosslinkable functional group is less than the above, the crosslinked structure produced by the aliphatic isocyanate crosslinking agent may not be sufficiently formed, and the amount of the monomer having a crosslinkable functional group may be more than 10% by weight may not be sufficiently exhibited as a characteristic of the acrylic polymer.

Further, the acrylic polymer of the present invention does not impair the characteristics of the acrylic polymer except for the above (a-1) alkoxylate of (meth)acrylate and (a-2) a monomer having a crosslinkable functional group. Other acrylic polymers may also be copolymerized within the range.

Here, examples of the other monomer forming the acrylic polymer include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, and isopropyl (meth)acrylate. Ester, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, amyl (meth)acrylate, hexyl (meth)acrylate, (methyl) Heptyl acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, decyl (meth) acrylate, decyl (meth) acrylate, eleven (meth) acrylate, ( Dimethyl methacrylate. These (meth) acrylates can be used singly or in combination. Among these, it is preferred to use butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, methyl (meth)acrylate, isobutyl (meth)acrylate, etc. The alkyl acrylate-based acrylic polymer (A) may be used in the range of 0 to 79.9% by weight, preferably 0 to 69.1% by weight, more preferably It is preferably used in the range of 0 to 48.3% by weight.

Further, the acrylic polymer (A) used in the present invention enhances the cohesive force of the adhesive and further promotes crosslinking by the isocyanate crosslinking agent, preferably in combination with the (a-3) nitrogen-containing monomer. polymerization. The nitrogen-containing monomer is preferably at least one selected from the group consisting of an amine group-containing monomer, a guanamine group-containing monomer, a nitrogen-containing heterocyclic monomer, and a cyano group-containing monomer.

Examples of the monomer having an amino group herein include dimethylaminoethyl (meth)acrylate and diethylaminoethyl (meth)acrylate.

Further, examples of the guanamine group-containing monomer include (meth) acrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, and N-propyl. Base (meth) acrylamide, N-hexyl (meth) acrylamide.

Further, examples of the monomer containing a nitrogen-based heterocyclic ring include, for example, vinylpyrrolidone, acryloylmorpholine, and vinyl caprolactam.

Further, examples of the cyano group-containing monomer include cyano (meth) acrylate.

The (a-3) nitrogen-containing monomer is preferably 5% by weight or less, more preferably 0.1 to 4% by weight, most preferably 0.5 to 3% by weight, based on the acrylic polymer. polymerization.

Further, in the acrylic polymer (A) used in the present invention, other monomers may be copolymerized in a range that does not inhibit the effects of the present invention. Other single systems include, for example, vinyl acetate; (meth)acrylonitrile; cyclohexyl (meth)acrylate, benzyl (meth)acrylate, phenyl (meth)acrylate; styrene, methyl Styrene, dimethyl styrene, trimethyl styrene, propyl styrene, butyl styrene, hexyl styrene, heptyl styrene and octane Alkyl styrene such as styrene, styrene such as fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene, styrene iodide, nitrostyrene, ethyl styrene styrene and methoxy styrene a monomer; glycidyl acrylate, glycidyl methacrylate, further a methyl methacrylate polymer having an unsaturated group, a butyl methacrylate polymer having an unsaturated group, and an unsaturated group. Giant monomers such as styrene polymers.

The acrylic polymer (A) used in the present invention does not substantially have an acidic group. In the present specification, a hydroxyl group is not included in the acidic group. The absence of an acidic group herein means that the acidic group is not intentionally blended, and if it is represented by an acid value, it is generally 0.5 or less. Here, a monomer having a carboxyl group such as a single system (meth) acrylate having an acidic group, maleic acid or itaconic acid, a monomer having a phosphate group, a monomer having a sulfate group, or the like. In the acrylic polymer (A) of the present invention, the above-mentioned single system containing an acidic group is not copolymerized. Since the acid group-containing monomer is not copolymerized in this manner, the acrylic polymer (A) of the present invention does not corrode even if it is in direct contact with a wiring composed of a metal or a metal oxide, and can be used in the present invention. The adhesive imparts a characteristic that the resistance value of the wiring is not changed over a long period of time.

Further, the acrylic polymer (A) used in the present invention has a weight average molecular weight of 50,000 or more and less than 400,000, preferably in the range of 100,000 to 380,000.

The acrylic polymer (A) can be produced by a known method, but it is preferably produced by solution polymerization. In the solution polymerization, as the polymerization solvent, for example, ethyl ethate, methyl ethyl ketone, toluene, acetone or the like can be used. Specifically, a polymerization solvent, a monomer, and a nitrogen gas are fed into the reaction vessel. The polymerization initiator is added under an inert gas atmosphere, and heated to a reaction temperature of about 50 to 90 ° C for 4 to 20 hours.

The reaction initiator used in the solution polymerization may, for example, be an azo initiator or a peroxide initiator. These reaction initiators are generally used in an amount of from 0.01 to 5 parts by weight based on 100 parts by weight of the monomers. Further, in the above polymerization reaction, a polymerization initiator, a chain transfer agent, a monomer, and a solvent may be appropriately added.

In the above conditions, the weight average molecular weight is adjusted by adjusting the reaction conditions such as the kind of the solvent to be used, the kind and amount of the polymerization initiator, the reaction time, and the reaction temperature, according to a known technique.

The adhesive of the present invention further contains an aliphatic isocyanate crosslinking agent (B). After the aliphatic isocyanate crosslinking agent (B) is crosslinked, the flexibility of the adhesive sheet is maintained, and the adhesion of the adhesive sheet to a hard coated surface such as polyethylene terephthalate is good.

Examples of the aliphatic isocyanate crosslinking agent (B) used in the present invention include, for example, hexamethylene diisocyanate and tetramethylene diisocyanate having a compound having two or more isocyanate groups in one molecule, and further It is a urethane prepolymer type which is subjected to an addition reaction with a known polyether polyol or polyester polyol, acrylic polyol, polybutadiene polyol, polyisoprene or the like. A compound having two or more isocyanate groups in one molecule. Among these, it is preferable to improve the step-following property of the adhesion surface and to improve the heat-resistant foaming property, and it is preferably a compound having three or more isocyanate groups in one molecule. The compound having three or more isocyanate groups in one molecule may have, for example, two or more molecules in one molecule. An addition type compound of an isocyanate group-containing compound, a compound obtained by subjecting a compound having two or more isocyanate groups in one molecule to a polyhydric alcohol such as pentaerythritol, or more than two molecules in one molecule A trimeric isocyanate compound of the isocyanate group-containing compound, and a biuret type compound having a compound having two or more isocyanate groups in one molecule. The compound of the above-mentioned addition type is, for example, a compound obtained by subjecting a compound having two or more isocyanate groups in one molecule to addition reaction with trimethylolpropane.

Such an aliphatic isocyanate crosslinking agent (B) can be used singly or in combination. The content of the aliphatic isocyanate crosslinking agent (B) in the adhesive of the present invention is 0.1 to 5 parts by weight, preferably 0.1 to 2 parts by weight, per 100 parts by weight of the acrylic polymer (A).

By blending the aliphatic isocyanate crosslinking agent (B), the cohesive force of the adhesive is improved, and the expansion of the bubbles which are caught in a small amount during the attachment can be suppressed.

The adhesive of the present invention is also preferably a low molecular weight body having a constituent unit derived from a nitrogen-containing monomer. The nitrogen-containing single system may, for example, be exemplified above. The monomer other than the nitrogen-containing monomer constituting the low molecular weight body is not particularly limited as long as it is a monomer having an unsaturated group, and is preferably an acrylic polymer such as (meth)acrylate or styrene. It is a monomer or the like. The weight average molecular weight of the low molecular weight body is preferably 5,000 or more and less than 50,000. When the adhesive of the present invention contains the above-mentioned low molecular weight body, it has an effect of enhancing the cohesive force of the adhesive and further promoting crosslinking by an isocyanate crosslinking agent.

The adhesive of the present invention may further blend an antioxidant, a metal corrosion inhibitor, a light stabilizer, and the like insofar as the effect of the adhesive of the present invention is not impaired. Adhesives, plasticizers, antistatic agents, crosslinking accelerators, heavy chemicals, etc.

The adhesive obtained in this manner is applied to a suitable concentration in the same manner as a known adhesive, and then applied and dried, whereby it can be used for adhesion of various members. The coating solution containing the acrylic polymer (A) and the aliphatic isocyanate crosslinking agent (B) used in the present invention in a solvent is low in weight average molecular weight (Mw) of the acrylic polymer (A). The concentration of the nonvolatile component is easily adjusted in a solvent such as ethyl acetate, methyl ethyl ketone, acetone or toluene. Therefore, by using the adhesive of the present invention, the thickness of the adhesive after application can be easily formed to a desired thickness. In particular, the adhesive of the present invention can easily prepare a solution having a high content of nonvolatile matter, for example, the nonvolatile content can be adjusted in the range of 10 to 70%, preferably 30 to 60%. Therefore, the desired thickness can be achieved with a small number of coatings. Further, by using a solution having a high content of nonvolatile components, the leveling property of the coating film after coating and drying is improved, and the drying time is also shortened, and the workability is improved. Further, since the amount of the volatile solvent is small, the load on the environment is also reduced.

With such characteristics, the adhesive sheet of the present invention is obtained by coating the above-mentioned adhesive into a thickness in the range of 10 to 1000 μm, preferably in the range of 25 to 500 μm.

The adhesive sheet is generally prepared by adjusting a non-volatile component to a coating liquid of 10 to 70% (preferably 30 to 60%) of an adhesive on a surface of a support which is subjected to a release treatment (for example, a peeling treatment PET). The thickness is set to a thickness in the range of 25 to 1000 μm, preferably in a range of 25 to 500 μm, and after the solvent is removed, the formed viscosity is formed. The surface of the layer is attached to the surface of the cover film which is subjected to the release treatment, and is usually aged at 0 to 50 ° C for 1 to 10 days.

The adhesive layer obtained in this manner has a gel fraction of 40 to 80%, preferably 60 to 70%.

The adhesive sheet obtained in this manner can be attached to various members, but is particularly suitable for attaching a member for a touch panel to which a different member is attached.

As shown in FIGS. 1 and 2, the touch panel unit is a unit of a resistive touch panel (see FIG. 1) and a unit of a capacitive touch panel (see FIG. 2).

An example of the resistive film type touch panel unit 10-1 is shown in Fig. 1. As shown in FIG. 1, the resistive film type touch panel unit 10-1 is formed of the upper laminated body 11-1 and the lower laminated body 13-1 by forming the gap 34 by the bonding agent 30, and is formed in the gap 34. The spacers 32 are arranged in order to effectively secure the space.

A transparent conductive film 27-1 made of a metal or a metal oxide is disposed on the upper laminated body 11-1 so as to face the gap 34. The transparent conductive film 27-1 is formed of a transparent conductive material such as ITO, ATO or tin oxide. Generally, as shown in Fig. 1, it is formed on polyethylene terephthalate (PET) and poly The surface of the upper electrode support 25-1 is composed of carbonate (PC), polymethyl methacrylate (PMMA) or glass.

The surface support 21-1 is disposed on the outermost surface of the upper laminate, and the surface support 21-1 is generally made of glass or polycarbonate (PC) or polyethylene terephthalate (PET) having high transparency. A transparent film such as polymethyl methacrylate (PMMA) or cycloolefin polymer (COP), or a transparent plate. For the above surface support Next, the body 21-1 and the upper electrode support 25-1 form an adhesive layer 23-1 composed of the adhesive of the present invention. A surface of the upper electrode support 25-1 and the adhesive layer 23-1 of the surface support 21-1 is preferably provided with a hard coat layer. The hard coat layer can be used without any limitation as a general user. However, even if it is an antimony-based hard coat layer which is generally difficult to be followed by an acrylic adhesive, the adhesion is improved, and it is preferable.

Further, the lower laminated body 13-1 is formed to face the gap 34 to form a transparent conductive film 27-2 made of a metal or a metal oxide. The transparent conductive film 27-2 is transparent with ITO, ATO, tin oxide, or the like. It is formed of a conductive material and is generally formed of polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), etc. as shown in Fig. 1. The film or glass constitutes the surface of the lower electrode support 25-2.

The deepest portion of the lower laminated body 13-1 is formed as a deep surface supporting body 21-2 as opposed to the surface of the display, and the deep surface supporting body 21-2 is made of glass or polycarbonate or polyethylene terephthalate. A highly transparent member such as a diester (PET), a polymethyl methacrylate (PMMA) or a cycloolefin polymer (COP) is formed.

In the lower laminated body 13-1, in order to connect the deep surface support 21-2 and the lower electrode support 25-2, the adhesive layer 23-2 composed of the adhesive of the present invention is formed. A surface of the lower electrode support 25-2 and the adhesive layer 23-2 of the surface support 21-2 is preferably provided with a hard coat layer. The hard coat layer can be used without limitation for a general user. For example, a hard coat layer of an oxygen-based type, the acrylic adhesive of the present invention exhibits sufficient viscosity even if it is a adherend which does not have sufficient adhesion in a general acrylic adhesive. Focus on, it is better to use.

Further, in the case of the bonding agent 30, the adhesive of the present invention may be used.

Further, the transparent conductive films 27-1 and 27-2 are pressed by a finger or the like from the surface support 21-1, and the gap 34 of the portion where the pressure is applied disappears, and the transparent conductive films 27-1 and 27-2 are removed. It is energized by contact, and is formed by detecting a pressurized portion.

In the resistive film type touch panel unit 10-1, the thickness of the surface supporting body 21-1 is generally 25 to 2000 μm, and the thickness of the upper transparent conductive film 27-1 is generally 10 to 100 nm, and the upper electrode supporting body 25-1 is The thickness is generally from 25 to 2000 μm. The thickness of the adhesive layer 23-1 laminated is such that it is in the range of 10 to 1000 μm, preferably 25 to 500 μm as described above.

Similarly, in the resistive film type touch panel unit, the thickness of the surface support 21-2 in the deep portion is generally 25 to 2000 μm, and the thickness of the lower transparent conductive film 27-2 is generally 10 to 100 nm, and the lower electrode support 25- The thickness of 2 is generally 25 to 2000 μm. The thickness of the adhesive layer 23-2 laminated is such that it is in the range of 10 to 1000 μm, preferably 25 to 500 μm as described above.

Further, in the resistive film type touch panel unit 10-1, the width of the gap 30 formed in the center is generally in the range of 1 to 2000 μm.

Further, the capacitive touch panel unit 10-2 generally has a central support body 60 which is formed of a member having high transparency such as glass or polycarbonate, and is provided with an upper laminated body 15-1 and a lower laminated layer. The structure of the body 15-2.

In the upper laminated body 15-1 of the capacitive touch panel 10-2, the transparent conductive film 57-1 is disposed in contact with the central support 60, and the outermost surface is configured by cover glass or polyparaphenyl. A surface support 51-1 composed of a light transmissive member such as ethylene dicarboxylate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA) or cycloolefin polymer (COP). The transparent conductive film 57-1 is formed of a conductive material having transparency such as ITO, ATO or tin oxide.

The adhesive layer 53-1 composed of the adhesive of the present invention is disposed such that the transparent conductive film 57-1 is adhered to the surface support 51-1, and the adhesive layer 53-1 is directly bonded to the transparent conductive film 57-1. contact. A surface coated with the adhesive layer 53-1 of the surface support 51-1 is preferably provided with a hard coat layer. The hard coat layer can be used without limitation for a general user. For example, in the case of a hard coat layer of an oxygen-based coating, the acrylic adhesive of the present invention exhibits sufficient adhesion and is preferably used even in the case of an adherend which does not have sufficient adhesion in a general acrylic adhesive.

Further, in the laminated body 15-2 under the capacitive touch panel unit 10-2, the transparent conductive film 57-2 is disposed in contact with the central support 60, and the deepest portion is disposed by covering glass or polyphenylene. A surface support 51-2 composed of a light transmissive member such as ethylene formate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA) or cycloolefin polymer (COP). The transparent conductive film 57-2 is formed of a conductive material having transparency such as ITO, ATO or tin oxide. The adhesive layer 53-2 composed of the adhesive of the present invention is disposed such that the transparent conductive film 57-2 is adhered to the deepest surface support 51-2, and the adhesive layer 53-2 is directly bonded to the transparent conductive film. 57-2 contact. A surface coated with the adhesive layer 53-2 of the surface support 51-2 is preferably provided with a hard coat layer. The hard coat layer can be used without limitation for a general user. For example, the hard coat layer of the oxime type is an adhesive body which does not have sufficient adhesion in a general acrylic pressure-sensitive adhesive, and the acrylic pressure-sensitive adhesive of the present invention exhibits sufficient adhesion and is preferably used.

In the capacitive touch panel unit 10-2, the deepest surface support 51-2 is disposed opposite to the display.

In the above capacitive touch panel unit 10-2, the thickness of the upper surface supporting body 51-1 is generally 25 to 2000 μm, and the thickness of the upper transparent conductive film 57-1 is generally 10 to 100 nm, and then the adhesion of the two is adhered. The thickness of the agent layer 53-1 is 10 to 1000 μm as described above. Further, in the lower laminated body 15-2, the thickness of the lower transparent conductive film 57-2 is generally 10 to 100 nm, and the thickness of the surface support 51-2 at the deepest portion is generally 25 to 2000 μm, followed by the adhesive layers of the two. The thickness is 10 to 1000 μm as described above. The thickness of the central support 60 located between the upper laminated body 15-1 and the lower laminated body 15-2 is generally in the range of 25 to 1000 μm.

Further, the upper transparent conductive film 57-1 and the lower transparent conductive film 57-2 form an electric circuit. Further, in the capacitive touch panel unit 10-2 shown in FIG. 2, the upper laminated body 15-1 and the lower laminated body 15-2 are independently set to the X-axis direction and the Y-axis direction. In the second series of circuits, the upper laminated body 15-1 or the lower laminated body 15-2 may be omitted.

In the capacitive touch panel, the electrostatic capacitance of the contact portion generated by the read finger contacting the surface of the touch panel unit 10-2 is changed. The contact position is detected.

The touch panel unit as described above performs margin printing on the surface of the surface layer support 51-1 of the surface support 51-1 which is shown by the edge of FIG. This margin printed portion is expanded to the one shown in Figure 3. The portion printed on the fore edge in Fig. 3 is denoted by reference numeral 62. The thickness of the fore edge printed portion 62 is generally 10 to 50 μm, and the cross section thereof is formed into a rectangular shape. The adhesive layer 53-1 is formed by attaching the above-described adhesive sheet of the present invention to the surface support 51-1, so that the adhesive layer formed on the adhesive sheet is hard and lacks step followability, as shown in FIG. As shown in (a), the edge of the fore edge printed portion 62 and the surface support 51-1 form an edge between the adhesive layer 53-1 and the surface support 51-1 and the front edge printed portion 62. The void 64, which is not in contact with any of the portions, is originally formed as shown in Fig. 4(b), and the edge portion of the surface support 51-1 and the front edge printed portion 62 must be bonded to the adhesive layer 53. -1 is connected.

However, as is conventionally known, in the case of an adhesive having an acrylic polymer having a weight average molecular weight of 400,000 to 1,600,000 as a base, the shape of the adhesive layer does not change for such a very fine form change. Sufficient to form a void 64.

The adhesive layer 53-1 constituting the member for a touch panel of the present invention having a surface support, an adhesive layer, and (and sometimes a support) transparent conductive film has a specific composition as described above, and a weight average is used. The acrylic polymer (A) having a molecular weight (Mw) of 50,000 or more and less than 400,000 is crosslinked by the aliphatic isocyanate crosslinking agent (B), and the ruthenium has a very excellent step followability. Forming a gap around the periphery of the fore edge printing portion 62 64.

Further, as for the member for a touch panel of the present invention, as shown in Fig. 5, when the support member 51-2 is used as a member which is easy to generate a gas release like polycarbonate (PC), for example, if it is subjected to heat resistance test conditions The test was carried out under the conditions of 80 ° C to generate outgas from the support, and bubbles 66 were sometimes generated between the support and the adhesive layer. Further, even if a support that does not generate outgas is used, the bubble 68 may be wound around the support and the adhesive layer, and if the bubble grows due to temperature change, it may cause foaming. The adhesive of the present invention has a specific composition, and an acrylic polymer (A) having a weight average molecular weight (Mw) of 50,000 or more and less than 400,000 is used, and such an aliphatic isocyanate crosslinking agent (B) is used. Since cross-linking is carried out, it has a very high cohesive force, and foaming by the bubbling caused by the above-described outgassing and the growth of the entrapped bubbles can be suppressed by a high cohesive force. Therefore, in the member for a touch panel of the present invention, the above-described foaming system can be hardly observed.

Further, in the member for touch panel, the member was placed under endurance test conditions (85 ° C, 85%), and as shown in Fig. 6, moisture may infiltrate from the support and the end. In the high temperature condition, the infiltrated moisture is not precipitated, but if the temperature is lowered, the infiltrated water is analyzed and the components of the touch panel are whitened, and the haze is remarkably increased. The adhesive layer forming the member for a touch panel of the present invention has a specific composition, and even if moisture from the support layer penetrates, precipitation of moisture can be suppressed, and an increase in haze caused by whitening is extremely unlikely to occur.

Further, in the adhesive of the present invention, the acidic conductive group is substantially not contained, so that the transparent conductive film composed of a metal or a metal oxide is in direct contact with the adhesive, and the resistance value of the transparent conductive film is even the largest. At about 10%, this amount of change is on the drive touch panel to the extent that it is not a problem at all.

As described above, the member for a touch panel of the present invention uses a main acrylic polymer (A) having a specific composition and having a weight average molecular weight of 50,000 or more and less than 400,000, and an aliphatic isocyanate system. The adhesive of the crosslinking agent (B) adheres the support to the transparent conductive film, and has excellent step followability. The printed portion of the edge formed at the edge portion does not form a void, and the blistering caused by the entrapment can be suppressed. Further, both of the foaming generated by the outgassing are not easy to precipitate moisture, so that the adhesive layer is not whitened and the haze is also increased.

(Example)

Next, the present invention will be described in more detail by showing examples of the invention, but the invention is not limited thereto.

The weight average molecular weight, gel fraction, wet heat whitening property, heat foaming property, ITO corrosion property, step followability, and adhesion strength of the adhesive were measured by the methods shown below.

[test methods] <Molecular weight>

The weight average molecular weight (Mw) in terms of standard polystyrene was determined by gel permeation chromatography (GPC).

Measuring condition

Device: HLC-8120 GPC (Tosoh system)

Column: Use the following five series of columns.

TSK-GEL HXL-H (Guard Column, Tosoh)

TSK-GEL G7000 HXL (Tosoh)

TSK-GEL GMHXL (Tosoh)

TSK-GEL GMHXL (Tosoh)

TSK-GEL G2500 HXL (made by Tosoh)

Sample concentration: diluted with tetrahydrofuran to 1.0 mg/cm ³

Mobile phase solvent: tetrahydrofuran

Flow rate: 1.0cm ³ / minute,

Column temperature: 40 ° C

<gel fraction>

After about 7 days of curing at 23 ° C, about 0.1 g (by weight) of the adhesive composition was taken into the sample bottle, and after adding ethyl acetate 30 cc and shaking for 4 hours, the contents of the sample bottle were made of 200 mesh stainless steel. The metal mesh was filtered, and the residue on the metal mesh was dried at 100 ° C for 2 hours to measure the dry weight, and was determined by the following formula.

Gel fraction (%) = (dry weight of the adhesive composition / weight taken of the adhesive composition) × 100

<Haze>

The polyethylene terephthalate film (hereinafter, also referred to as a PET film) obtained by peeling off one side of the obtained adhesive sheet was peeled off, and a polyethylene terephthalate film having a thickness of 25 μm was bonded thereto. Cut to a size of 50mm × 50mm. Then, another peeling film was peeled off, bonded to a polycarbonate (PC) plate having a thickness of 2 mm, and treated with an autoclave at 50 ° C and 5 atm for 2 minutes, and then allowed to stand for 1 hour to prepare a test piece.

After measuring the haze of the test piece prepared before the endurance test, respectively The durability test was carried out by allowing to stand at 60 ° C and 90% environment at 85 ° C and 85% atmosphere for 500 hours. Thereafter, each test piece was allowed to stand at room temperature for 1 hour, and then the haze was measured to determine the difference from the haze before the endurance test.

For the measurement of the haze, MH-150 (manufactured by Murakami Color Technology Research Institute Co., Ltd.) was used.

<bubble>

The peeled PET film of one surface of the obtained adhesive sheet was peeled off, and a polyethylene terephthalate film having a thickness of 25 μm on which ITO was deposited was bonded and cut into a size of 50 mm × 50 mm. Then, another peeling film was peeled off, bonded to a polycarbonate (PC) plate having a thickness of 2 mm, and treated with a pressure cooker at 50 ° C and 5 atm for 2 minutes, and then allowed to stand for 1 hour to prepare a test piece.

The prepared test pieces were allowed to stand at 60 ° C and 90% environment, 85 ° C and a dry environment, 85 ° C and 85% environment for 500 hours. Thereafter, each test piece was allowed to stand at room temperature for 1 hour, and the state of foaming was visually confirmed, and it evaluated on the following basis.

The benchmark for evaluation is as follows.

(assessment) (content)

◎: Foaming could not be confirmed by visually observing the adhesive layer.

○: The bubbles were slightly confirmed by visual observation.

△: It is practical, but bubbles can be clearly observed by visual observation.

×: A large bubble can be confirmed. Further, the adhesive layer floats from the substrate or the adherend.

<ITO resistance change rate>

A test piece is prepared in the same manner as the foaming test, and the test piece is measured in advance. The resistance value. Then, the resistance value of the test piece which was allowed to stand at 85 ° C and 85% environment for 500 hours was measured, and the rate of change of the resistance value for the value measured in advance was obtained.

Further, the measurement of the electric resistance value was carried out by using a measuring instrument (manufactured by Sanhe Electric Co., Ltd., Digital Multimeter PC 510).

<step difference followability>

The peeled PET film of one surface of the obtained adhesive sheet was peeled off, and a PET film of 25 μm was bonded and cut into 50 mm × 50 mm to prepare a test piece.

Then, the PET film cut into 25 mm × 25 mm was placed on a glass plate, and the peeled PET film was peeled off on the other side of the prepared test piece to fit the PET film on the entire surface glass plate. After standing at 80 ° C for 500 hours, it was allowed to stand at room temperature for 1 hour to visually observe the appearance of the step portion.

(assessment) (content)

◎: Bubbles could not be confirmed by visually observing the section of the attached portion.

○: The bubble can be slightly confirmed by visually attaching the step portion.

×: Large bubbles were confirmed in the attached step portion. Further, the adhesive layer floats from the substrate or the adherend.

<Adhesion to ITO>

The peeled PET film of one surface of the obtained adhesive sheet was peeled off, bonded to a 25 μm PET film, and cut into a width of 25 mm to prepare a test piece.

Then, the peeling PET film on the other side of the test piece was peeled off and bonded. A PET film deposited with ITO was deposited.

The test piece was peeled off at a speed of 300 mm/min in the 180° direction, and the peel strength was measured.

<Adhesion to HC>

The peeled PET film of one surface of the obtained adhesive sheet was peeled off, and the PET film of 25 micrometers was bonded, and it cut by the width of 25 mm, and the test piece was produced.

Then, the other surface peeling PET film of the test piece was peeled off and bonded to the epoxy hard coat PET film.

The test piece was peeled off at a speed of 300 mm/min in the 180° direction, and the peel strength was measured.

[Manufacturing Example 1]

60 parts by weight of methoxyethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. 4 parts by weight of (2-HEA), 2 parts by weight of acrylamide (AM), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 1 having a weight average molecular weight of 300,000.

[Manufacturing Example 2]

With a mixer, reflux cooler, thermometer and nitrogen inlet tube In the reaction apparatus, 60 parts by weight of methoxyethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), 4 parts by weight of 2-hydroxyethyl acrylate (2-HEA), and dimethylamine acrylate were fed. 2 parts by weight of ethyl methacrylate (DMAEA), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 2 having a weight average molecular weight of 300,000.

[Manufacturing Example 3]

60 parts by weight of methoxyethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. (2-HEA) 4 parts by weight, n-vinylpyrrolidone (n-VP) 2 parts by weight, and ethyl acetate (EtAc) 100 parts by weight, methyl ethyl ketone (MEK) 20 parts by weight, while introducing nitrogen The temperature was raised to 70 ° C.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 3 having a weight average molecular weight of 300,000.

[Manufacturing Example 4]

60 parts by weight of methoxyethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. (2-HEA) 4 heavy In an amount of 2 parts by weight of acryloylmorpholine (ACMO), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK), the temperature was raised to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 4 having a weight average molecular weight of 300,000.

[Manufacturing Example 5]

60 parts by weight of methoxydiethylene glycol acrylate (ECA), 34 parts by weight of butyl acrylate (BA), and 2-acrylic acid were added to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube. 4 parts by weight of hydroxyethyl ester (2-HEA), 2 parts by weight of acrylamide (AM), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK), and the temperature was raised while introducing nitrogen gas. 70 ° C.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 5 having a weight average molecular weight of 300,000.

[Manufacturing Example 6]

60 parts by weight of methoxyethyl acrylate (MEA), 36 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed into a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube. 4 parts by weight of (2-HEA), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 6 having a weight average molecular weight of 300,000.

[Manufacturing Example 7]

60 parts by weight of methoxyethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. 4 parts by weight of (2-HEA), 2 parts by weight of acrylamide (AM), and 150 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 7 having a weight average molecular weight of 100,000.

[Manufacturing Example 8]

20 parts by weight of methoxyethyl acrylate (MEA), 74 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube. 4 parts by weight of (2-HEA), 2 parts by weight of acrylamide (AM), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After the reaction, it was diluted with ethyl acetate (EtAc) and adjusted to a solid content. At a concentration of 30%, an acrylic polymer 8 having a weight average molecular weight of 300,000 was obtained.

[Manufacturing Example 9]

20 parts by weight of methoxyethyl acrylate (MEA), 74 parts by weight of 2-ethylhexyl acrylate (2EHA), and acrylic acid 2 were fed into a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. 4 parts by weight of hydroxyethyl ester (2-HEA), 2 parts by weight of acrylamide (AM), 110 parts by weight of ethyl acetate (EtAc), and 10 parts by weight of methyl ethyl ketone (MEK), and heated while introducing nitrogen gas Up to 70 ° C.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 9 having a weight average molecular weight of 380,000.

[Manufacturing Example 10]

In a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube, 60 parts by weight of methoxyethyl acrylate (MEA), 37 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed. (2-HEA) 1 part by weight, 2 parts by weight of acrylamide (AM), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 10 having a weight average molecular weight of 300,000.

[Manufacturing Example 11]

60 parts by weight of methoxyethyl acrylate (MEA), 35 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. 3 parts by weight of (2-HEA), 2 parts by weight of acrylamide (AM), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 11 having a weight average molecular weight of 300,000.

[Manufacturing Example 12]

60 parts by weight of methoxyethyl acrylate (MEA), 29 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. 9 parts by weight of (2-HEA), 2 parts by weight of acrylamide (AM), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 12 having a weight average molecular weight of 300,000.

[Manufacturing Example 13]

60 parts by weight of methoxyethyl acrylate (MEA), 33 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube. 4 parts by weight of (2-HEA), 2 parts by weight of acrylamide (AM), 1 part by weight of acrylic acid (AA), 100 parts by weight of ethyl acetate (EtAc), and 20 parts by weight of methyl ethyl ketone (MEK). The temperature was raised to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 13 having a weight average molecular weight of 300,000.

[Manufacturing Example 14]

60 parts by weight of methoxyethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. 4 parts by weight of (2-HEA), 2 parts by weight of acrylamide (AM), and 120 parts by weight of ethyl acetate (EtAc) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 14 having a weight average molecular weight of 500,000.

[Manufacturing Example 15]

Into a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube, 63 parts by weight of butyl acrylate (BA) was fed, and acrylic acid was fed. 31 parts by weight of ester (MA), 4 parts by weight of 2-hydroxyethyl acrylate (2-HEA), 2 parts by weight of acrylamide (AM), and 105 parts by weight of ethyl acetate (EtAc), methyl ethyl ketone (MEK) 15 parts by weight, the temperature was raised to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 15 having a weight average molecular weight of 360,000.

[Manufacturing Example 16]

60 parts by weight of methoxyethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), and 2-hydroxyethyl acrylate were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube. 4 parts by weight of (2-HEA), 2 parts by weight of acrylamide (AM), and 180 parts by weight of methyl ethyl ketone (MEK) were heated to 70 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust the solid concentration to 30% to obtain an acrylic polymer 16 having a weight average molecular weight of 30,000.

[Manufacturing Example 18 Production of Low Molecular Weight Body]

95 parts by weight of methyl methacrylate (MMA), 5 parts by weight of dimethylaminoethyl acrylate (DMAEA) and toluene 150 were fed to a reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer and a nitrogen introduction tube. The temperature was raised to 85 ° C while introducing nitrogen gas.

Then, 0.2 part by weight of azobisisobutyronitrile (AIBN) was added, and polymerization was carried out at 70 ° C for 5 hours under a nitrogen atmosphere.

After completion of the reaction, the mixture was diluted with ethyl acetate (EtAc) to adjust to a solid concentration of 30% to obtain a low molecular weight body having a weight average molecular weight of 10,000.

[Example 1]

The adhesive composition was obtained by mixing 0.3 parts by weight of trimethylolpropane-molded hexamethylene diisocyanate as a crosslinking agent with respect to 100 parts by weight of the acrylic polymer 1 obtained in Production Example 1.

The obtained adhesive composition was applied onto a peeled polyethylene terephthalate (PET) film so as to have a thickness of 50 μm after drying, and dried at 80 ° C for 2 minutes to remove a solvent. Adhesive layer. The peeled PET film was bonded to the surface of the surface in contact with the PET film of the adhesive layer, and aging was performed for 7 days at 23 ° C in a 65% environment to obtain an adhesive sheet.

[Embodiment 2]

An adhesive sheet was obtained in the same manner as in Example 1 except that 100 parts by weight of the acrylic polymer 2 was used instead of 100 parts by weight of the acrylic polymer 1.

[Example 3]

An adhesive sheet was obtained in the same manner as in Example 1 except that 100 parts by weight of the acrylic polymer 3 was used instead of 100 parts by weight of the acrylic polymer 1.

[Example 4]

An adhesive sheet was obtained in the same manner as in Example 1 except that 100 parts by weight of the acrylic polymer 4 was used instead of 100 parts by weight of the acrylic polymer 1.

[Example 5]

The adhesion was obtained in the same manner as in Example 1 except that 0.3 parts by weight of a trimeric isocyanate of hexamethylene diisocyanate was used, and 0.3 parts by weight of a substituted trimethylolpropane-formed hexamethylene diisocyanate was used as a crosslinking agent. sheet.

[Embodiment 6]

The same procedure as in Example 1 was carried out except that 0.3 parts by weight of a diuret-type hexamethylene diisocyanate was used, and 0.3 parts by weight of a substituted trimethylolpropane-formed hexamethylene diisocyanate was used as a crosslinking agent. Adhesive tablets.

[Embodiment 7]

An adhesive sheet was obtained in the same manner as in Example 1 except that the acrylic polymer 5 was used instead of the acrylic polymer 1.

[Embodiment 8]

5 parts by weight of the low molecular weight body obtained in Production Example 18, and trimethylolpropane-formed hexamethylene diisocyanate as a crosslinking agent were used, except that 100 parts by weight of the acrylic polymer 6 obtained in Production Example 6 was used. An adhesive sheet was obtained in the same manner as in Example 1 except that 0.3 parts by weight of the obtained adhesive composition was obtained.

[Embodiment 9]

An adhesive sheet was obtained in the same manner as in Example 1 except that the acrylic polymer 7 was used instead of the acrylic polymer 1.

[Embodiment 10]

In place of the acrylic polymer 1 in place of the acrylic polymer 1 The rest of the film was obtained in the same manner as in Example 1 to obtain an adhesive sheet.

[Example 11]

An adhesive sheet was obtained in the same manner as in Example 1 except that the acrylic polymer 9 was used instead of the acrylic polymer 1.

[Embodiment 12]

The amount of hexamethylene diisocyanate to which trimethylolpropane as a crosslinking agent is added is changed to 1 in place of 100 parts by weight of the acrylic polymer 10, except that the acrylic polymer 10 is used in place of the acrylic polymer 1. An adhesive sheet was obtained in the same manner as in Example 1 except for the parts by weight.

[Example 13]

The amount of hexamethylene diisocyanate to which trimethylolpropane as a crosslinking agent is added is changed to 0.5, in place of the acrylic polymer 11 in place of the acrylic polymer 1 with respect to 100 parts by weight of the acrylic polymer 11. An adhesive sheet was obtained in the same manner as in Example 1 except for the parts by weight.

[Embodiment 14]

The amount of hexamethylene diisocyanate to which trimethylolpropane is added as a crosslinking agent is changed to 0.1, in place of the acrylic polymer 12, in place of the acrylic polymer 12, with respect to 100 parts by weight of the acrylic polymer 12. An adhesive sheet was obtained in the same manner as in Example 1 except for the parts by weight.

[Comparative Example 1]

In addition to the use of 100 parts by weight of the acrylic polymer 1 as a crosslinking agent, trimethylolpropane-added decyl diisocyanate 0.4 parts by weight of substituted trimethylolpropane plus hexamethylene diisocyanate 0.3 Other than the adhesive composition obtained in parts by weight, the rest of the examples and examples 1 Get the adhesive sheet in the same way.

[Comparative Example 2]

In addition to using 0.3 parts by weight of a diuret-type decyl diisocyanate as a crosslinking agent, 0.3 part by weight of a substituted trimethylolpropane-formed hexamethylene diisocyanate is used as a crosslinking agent. The adhesive sheet was obtained in the same manner as in Example 1 except for the obtained adhesive composition.

[Comparative Example 3]

In addition to the use of 100 parts by weight of the acrylic polymer 1 as a crosslinking agent, trimethylolpropane-added toluene diisocyanate 0.3 parts by weight of substituted trimethylolpropane-formed hexamethylene diisocyanate 0.3 parts by weight The adhesive sheet was obtained in the same manner as in Example 1 except for the obtained adhesive composition.

[Comparative Example 4]

In addition to the use of 100 parts by weight of the acrylic polymer 1, as a crosslinking agent, trimethylolpropane-added isophorone diisocyanate 0.3 parts by weight of substituted trimethylolpropane-formed hexamethylene diisocyanate 0.3 An adhesive sheet was obtained in the same manner as in Example 1 except for the adhesive composition obtained in parts by weight.

[Comparative Example 5]

An adhesive sheet was obtained in the same manner as in Example 1 except that the acrylic polymer 13 was used instead of the acrylic polymer 1.

[Comparative Example 6]

In addition to using acrylic polymer 5 instead of acrylic polymer 1, 0.3 parts by weight of substituted trimethylolpropane-added hexamethylene diisocyanate 0.3 as a cross-linking agent mixed with trimethylolpropane-formed decyl diisocyanate as a crosslinking agent. An adhesive sheet was obtained in the same manner as in Example 1 except for the adhesive composition obtained in parts by weight.

[Comparative Example 7]

An adhesive sheet was obtained in the same manner as in Example 1 except that the acrylic polymer 14 was used instead of the acrylic polymer 1.

[Comparative Example 8]

The same procedure as in Example 1 was carried out except that the amount of hexamethylene diisocyanate to which trimethylolpropane was added as a crosslinking agent was changed to 0.05 part by weight based on 100 parts by weight of the acrylic polymer 1. Get an adhesive patch.

[Comparative Example 9]

The same procedure as in Example 1 was carried out except that the amount of hexamethylene diisocyanate to which trimethylolpropane was added as a crosslinking agent was changed to 10 parts by weight based on 100 parts by weight of the acrylic polymer 1. Get an adhesive patch.

[Comparative Example 10]

An adhesive sheet was obtained in the same manner as in Example 1 except that the acrylic polymer 15 was used instead of the acrylic polymer 1.

[Comparative Example 11]

An adhesive sheet was obtained in the same manner as in Example 1 except that the acrylic polymer 16 was used instead of the acrylic polymer 1.

The abbreviations in the table are as follows.

MEA: methoxyethyl acrylate

ECA: methoxydiethylene glycol acrylate

BA: butyl acrylate

2 EHA: 2-ethylhexyl acrylate

MA: Methyl acrylate

2-HEA: 2-hydroxyethyl acrylate

AM: acrylamide

DMAEA: dimethylaminoethyl acrylate

n-VP: n-vinylpyrrolidone

ACMO: acryloyl morpholine

AA: Acrylic

HDI: hexamethylene diisocyanate

XDI: thiol diisocyanate

TDI: toluene diisocyanate

IPDI: Isophorone diisocyanate

10-1‧‧‧Resistance film type touch panel unit

10-2‧‧‧Solid Capacitor Touch Panel Unit

11-1, 15-1‧‧‧ upper laminate

13-1, 15-2‧‧‧ lower layer

21-1, 51-1, 51-2‧‧‧ surface support

21-2‧‧‧Deep surface support

23-1, 23-2, 53-1, 53-2‧‧‧ adhesive layer

25-1‧‧‧Upper electrode support

25-2‧‧‧Lower electrode support

27-1, 27-2, 57-1, 57-2‧‧‧ Transparent conductive film

30‧‧‧Adhesive

32‧‧‧ spacers

34‧‧‧ gap

60‧‧‧ central support

62‧‧‧ Front edge printing section

64‧‧‧ gap

66‧‧‧ bubbles

68‧‧‧ bubble

1 is a schematic cross-sectional view showing an example of a touch panel unit of a touch panel of a resistive film type in which a laminate for a touch panel of the present invention is incorporated.

2 is a schematic cross-sectional view showing an example of a touch panel unit of a capacitive touch panel in which a laminated body for a touch panel of the present invention is incorporated.

Fig. 3 is a schematic cross-sectional view showing an example of an end portion of a capacitive touch panel.

Fig. 4 is a schematic cross-sectional view showing an adhesive state of an adhesive sheet formed on the edge printed portion of the end portion of the touch panel.

Figure 5 is a diagram for explaining the foaming state of the laminated body for the touch panel. Sectional view.

Fig. 6 is a cross-sectional view for explaining the occurrence of a whitening phenomenon generated in a laminate for a touch panel.

10-1‧‧‧Resistance film type touch panel unit

11-1‧‧‧Upper laminate

13-1‧‧‧Lower laminated body

21-1‧‧‧Surface support

21-2‧‧‧Deep surface support

23-1, 23-2‧‧‧Adhesive layer

25-1‧‧‧Upper electrode support

25-2‧‧‧Lower electrode support

27-1, 27-2‧‧‧ Transparent conductive film

30‧‧‧Adhesive

32‧‧‧ spacers

34‧‧‧ gap

Claims (29)

An adhesive comprising: an acrylic polymer (A) and 0.1 to 5 parts by weight of an aliphatic isocyanate crosslinking agent (B) per 100 parts by weight of the acrylic polymer (A); the acrylic polymerization The substance (A) has a component (a-1) and (a-2) (a-1) alkoxylate of (meth)acrylic acid as shown below in an amount of 20 to 99.9% by weight, and (a-2) has cross-linking. The monomer having 0.1 to 10% by weight of the monomer of the functional group (100% by weight of the total monomer) is obtained by copolymerization of a polymer having substantially no weight average molecular weight of 50,000 or more and less than 400,000. The adhesive according to claim 1, wherein the aliphatic isocyanate crosslinking agent (B) has three or more isocyanate groups in one molecule. The adhesive according to claim 1 or 2, wherein the monomer having the crosslinkable functional group (a-2) forming the acrylic polymer (A) is a hydroxyl group-containing monomer. The adhesive according to any one of claims 1 to 3, wherein the acrylic polymer (A) is a monomer having a nitrogen content of 5% by weight or less (a-3). The one obtained by the polymerization. The adhesive according to claim 4, wherein the (a-3) nitrogen-containing monomer is a monomer containing an amine group-containing monomer, a guanamine-containing monomer, a nitrogen-containing heterocyclic ring, and the like. At least one selected from the group consisting of cyano monomers. An adhesive according to any one of claims 1 to 5, wherein The adhesive is an adhesive for a capacitive touch panel that is in direct contact with a metal or a metal oxide. The adhesive according to any one of claims 1 to 5, wherein the adhesive is a capacitive touch panel that is in direct contact with a hard coat layer on a surface support of a touch panel. Adhesive. The adhesive according to claim 7, wherein the hard coat layer is a ruthenium oxygen system. An adhesive sheet having an adhesive layer formed of an adhesive and having a gel fraction of 40 to 80% by weight and a thickness of 10 to 1000 μm; the adhesive contains: an acrylic polymer (A) 0.1 to 5 parts by weight based on 100 parts by weight of the aliphatic isocyanate crosslinking agent (B) based on the acrylic polymer (A); the acrylic polymer (A) contains the following components (a) -1) and (a-2) (a-1) alkoxylate of (meth)acrylic acid 20 to 99.9% by weight, (a-2) monomer having a crosslinking functional group of 0.1 to 10% by weight of a monomer The weight average molecular weight obtained by copolymerization (100% by weight of the total monomer) and having substantially no acidic group is 50,000 or more and less than 400,000. The adhesive sheet according to claim 9, wherein the aliphatic isocyanate crosslinking agent (B) has three or more isocyanate groups in one molecule. An adhesive sheet according to claim 9 or 10, wherein the shape is The monomer having a crosslinkable functional group in (a-2) of the above acrylic polymer (A) is a hydroxyl group-containing monomer. The adhesive sheet according to any one of claims 9 to 11, wherein the acrylic polymer (A) is a monomer having a nitrogen content of 5% by weight or less (a-3). Aggregated. The adhesive sheet according to claim 12, wherein the (a-3) nitrogen-containing monomer is a monomer containing an amine group-containing monomer, a guanamine-containing monomer, a nitrogen-containing heterocyclic ring, and the like. At least one selected from the group consisting of cyano monomers. The adhesive sheet according to any one of claims 9 to 13, wherein the adhesive for forming the adhesive sheet is an adhesive for a capacitive touch panel in direct contact with a metal or a metal oxide. The adhesive sheet according to any one of claims 9 to 14, wherein the adhesive forming the adhesive sheet is an electrostatic capacitive contact with a hard coating layer on a surface support of the touch panel. Adhesive for control board. The adhesive sheet according to claim 15, wherein the hard coat layer is an oxygen-based one. The adhesive sheet according to any one of claims 9 to 16, wherein a cover film subjected to a release treatment is disposed on at least one surface of the adhesive sheet. A laminated body for a touch panel, which is attached to one surface of an adhesive sheet, and has a surface supporting body printed on the edge of the surface facing the surface of the adhesive sheet, and attached to the other side of the adhesive sheet a transparent conductive film composed of a metal or a metal oxide, or a metal or metal with an electrode support a transparent conductive film composed of an oxide; the adhesive sheet having an adhesive layer formed of an adhesive and having a gel fraction of 40 to 80% by weight and a thickness of 10 to 1000 μm; the adhesive contains 0.1 to 5 parts by weight of the acrylic polymer (A) and 100 parts by weight of the aliphatic isocyanate crosslinking agent (B) based on the acrylic polymer (A); the acrylic polymer (A) Containing the components (a-1) and (a-2) (a-1) alkoxylate of (meth)acrylic acid as shown below, 20 to 99.9% by weight, (a-2) a monomer having a crosslinkable functional group 0.1 to 10% by weight of the monomer (100% by weight of the total monomer) obtained by copolymerization has substantially no weight average molecular weight of 50,000 or more and less than 400,000. The laminated body for a touch panel according to claim 18, wherein the laminated body for the touch panel is a member for forming a capacitive touch panel. The laminate for a touch panel according to claim 18, wherein the thickness of the margin printing is in the range of 10 to 50 μm. The laminated body for a touch panel according to any one of claims 18 to 20, wherein the transparent conductive film is a wiring pattern using ITO, ATO, or tin oxide, and the adhesive sheet is in direct contact with the wiring sheet. Wiring pattern. The touch panel according to any one of claims 18 to 21 The laminate, wherein the surface support has a thickness in the range of 25 to 2000 μm. The laminated body for a touch panel according to any one of claims 18 to 22, wherein the thickness of the transparent conductive film is in the range of 10 to 100 nm. The laminate for a touch panel according to any one of claims 18 to 23, wherein the aliphatic isocyanate crosslinking agent (B) has three or more isocyanate groups in one molecule. The laminate for a touch panel according to any one of claims 18 to 24, wherein the monomer having the crosslinkable functional group (a-2) of the acrylic polymer (A) is A hydroxyl group-containing monomer. The laminated body for a touch panel according to any one of claims 18 to 25, wherein the acrylic polymer (A) is made up of 5% by weight or less (a-3) of a nitrogen-containing monomer. The monomer is obtained by copolymerization. The laminate for a touch panel according to claim 26, wherein the (a-3) nitrogen-containing monomer is an amine-containing monomer, a guanamine-containing monomer, or a nitrogen-containing heterocyclic ring. At least one selected from the group consisting of a monomer and a cyano group-containing monomer. The laminated body for a touch panel according to any one of claims 18 to 27, wherein the adhesive sheet is in direct contact with a hard coat layer on a surface support of the touch panel. The laminated body for a touch panel according to claim 28, wherein the hard coat layer is a tantalum-oxygen system.