TWI385230B - An adhesive composition for an optical member, an adhesive layer for an optical member, an adhesive type optical member, a transparent conductive laminate, a touch panel, and an image display device - Google Patents

Description

Adhesive composition for optical member, adhesive layer for optical member, adhesive optical member, transparent conductive laminated body, touch panel, and image display device

The present invention relates to an adhesive composition for an optical member and an adhesive layer for an optical member formed from the adhesive composition. Moreover, the present invention relates to an adhesive optical member in which the above-described adhesive layer for an optical member is formed on at least one surface of an optical member. As the adhesive optical member, for example, a transparent conductive film with an adhesive layer can be used, and the transparent conductive film with the adhesive layer can be used for a new display such as a liquid crystal display or an electroluminescence display after being appropriately processed. Transparent electrode in a mode or a touch panel or the like. In addition, the transparent conductive film with an adhesive layer can be used for antistatic and electromagnetic wave blocking of transparent articles, liquid crystal dimming glass, and transparent heater. Moreover, as for the adhesive optical member, for example, an optical film with an adhesive layer can be used, and the optical film with the adhesive layer can be used for an image display device such as a liquid crystal display device or an organic EL display device. As the optical film, a polarizing plate, a retardation film, an optical compensation film, a brightness enhancement film, and the like can be used.

Conventionally, as the transparent conductive film, a so-called conductive glass in which an indium oxide thin film is formed on a glass is widely known. However, since the base material of the conductive glass is glass, flexibility and workability are inferior, and it may not be used depending on the application. Therefore, in addition to flexibility and workability, in terms of excellent impact resistance and light weight, various plastic films typified by polyethylene terephthalate film have been used as a substrate transparent in recent years. Conductive film.

The transparent conductive film is used as a transparent conductive laminated body in which a transparent substrate is bonded via an adhesive layer of a transparent conductive film with an adhesive layer, and the transparent conductive film with the adhesive layer is in a transparent plastic film. A transparent conductive film is provided on one surface of the substrate, and an adhesive layer is provided on the other surface of the transparent plastic film substrate (Patent Document 1).

Further, an optical film such as a polarizing plate is generally used as an optical film in which an adhesive layer of an adhesive layer is provided in advance on one surface of an optical film (Patent Document 2).

Patent Document 1: Japanese Patent Laid-Open No. Hei 6-309990

Patent Document 2: Japanese Patent Laid-Open Publication No. 2000-316181

An acrylic adhesive is mainly used for the adhesive layer applied to the optical member such as the transparent conductive film or the polarizing plate. As the acrylic pressure-sensitive adhesive, a crosslinking agent such as an isocyanate crosslinking agent is usually blended in an acrylic polymer as a matrix polymer. However, when an isocyanate type crosslinking agent is used, there is a problem that yellowing occurs in a high-temperature and high-temperature and high-humidity environment, and the visibility is lowered. In particular, when an isocyanate crosslinking agent and a peroxide are used as a crosslinking agent, yellowing is remarkable. Further, in Patent Document 2, an epoxy-based crosslinking agent and a peroxide are used as a crosslinking agent in the acrylic polymer as a matrix polymer. However, in the case of using an epoxy-based crosslinking agent and a peroxide, although there is no problem of yellowing, there is a problem that the crosslinking reaction with the crosslinking agent is insufficient due to the relationship with the acrylic polymer. The adhesive layer causes other problems of foaming and peeling under high temperature and high temperature and high humidity environment.

Further, when the transparent conductive laminated body is used for a touch panel substrate for a pen input such as a resistive film method, it is also required to satisfy the pen-indentation resistance which does not cause indentation or the like to the stylus pen. .

An object of the present invention is to provide an adhesive composition for an optical member which can form an adhesive layer capable of suppressing yellowing in a high-temperature and high-temperature and high-humidity environment and suppressing foaming or peeling in a high-temperature, high-temperature, high-humidity environment. Moreover, an object of the present invention is to provide an adhesive layer for an optical member formed of the adhesive composition for an optical member.

Moreover, an object of the present invention is to provide an adhesive optical member in which the above-described adhesive layer for an optical member is formed on at least one surface of an optical member. Further, an object of the present invention is to provide a transparent conductive film which is an adhesive layer capable of satisfying pen-indentation properties as an adhesive optical member. Moreover, an object of the present invention is to provide a transparent conductive laminated body using the transparent conductive film having the above-mentioned adhesive layer, and further to provide a transparent conductive film or a transparent conductive laminated body using the above-mentioned adhesive layer. Touch panel.

Further, an object of the present invention is to provide an optical film with an adhesive layer as an adhesive optical member, and an image display device using the optical film with the adhesive layer attached thereto.

In order to solve the above problems, the inventors of the present invention have made an effort to achieve the above object by using the following adhesive composition for an optical member, and finally completed the present invention.

That is, the present invention relates to an adhesive composition for an optical member, which comprises the following composition: as a monomer with respect to 100 parts by weight of an alkyl (meth)acrylate having an alkyl group having 4 to 14 carbon atoms. a unit comprising a (meth)acrylic polymer containing 0.2 to 20 parts by weight of a carboxyl group-containing monomer as a copolymerization component; and 0.02 to 2 with respect to 100 parts by weight of the above (meth)acrylic polymer. A part by weight of a peroxide and 0.005 to 5 parts by weight of an epoxy-based crosslinking agent are used as a crosslinking agent.

In the above-mentioned (meth)acrylic polymer, the pressure-sensitive adhesive composition for an optical member may further contain an isocyanate-based crosslinking agent as a crosslinking agent in an amount of 0.01 to 0.5 part by weight based on 100 parts by weight of the (meth)acryl-based polymer.

In the above-mentioned (meth)acrylic polymer, the adhesive composition for an optical member may further contain 0.01 to 1 part by weight of a decane coupling agent per 100 parts by weight of the (meth)acrylic polymer.

In the above-mentioned adhesive composition for an optical member, 100 parts by weight of an alkyl (meth)acrylate may be used as a monomer unit, and further, 0.01 to 5 parts by weight of a monomer having a hydroxyl group may be used as the above (methyl group). ) acrylic polymer.

Moreover, the present invention relates to an adhesive layer for an optical member, which is formed from the above-described adhesive composition for an optical member.

Preferably, the optical member adhesive layer has a storage elastic modulus (G') of from 20,000 to 500,000 Pa at 23 °C.

It is preferable that the adhesive layer for the optical member has a gel fraction of 70 to 98% by weight.

Moreover, the present invention relates to an adhesive optical member characterized in that the above-mentioned adhesive member for an optical member is formed on at least one surface of the optical member.

In the above-mentioned adhesive optical member, it is preferred that the adhesive layer and the optical member are laminated via an anchor layer. It is preferred that the anchor layer contains a polymer.

As for the above-mentioned adhesive optical member, for example, an adhesive layer is provided on one surface of the first transparent plastic film substrate, and an adhesive for a transparent conductive film is provided on the other surface of the first transparent plastic film substrate. A layer of transparent conductive film.

In the transparent conductive film with the adhesive layer described above, the transparent conductive film may be provided on one surface of the first transparent plastic film substrate via at least one undercoat layer.

Moreover, the present invention relates to a transparent conductive laminated body characterized in that a second transparent plastic film substrate is further bonded to an adhesive layer in the transparent conductive film with the adhesive layer.

In the transparent conductive laminated body, a hard coat layer may be provided on one surface or both surfaces of the second transparent plastic film substrate.

Further, the present invention relates to a touch panel characterized in that the transparent conductive film or the transparent conductive laminated body with the adhesive layer is used as a transparent conductive film for a touch panel.

In addition, as the adhesive optical member, for example, an optical film having an adhesive layer having an adhesive layer on at least one surface of the optical film for an image display device in the adhesive optical member may be mentioned. As the above optical film, a polarizing plate or a phase difference plate can be preferably used.

Further, the present invention relates to an image display device characterized by using at least one adhesive optical member relating to an optical film of the above-mentioned adhesive layer.

In the adhesive composition for an optical member of the present invention, a specific amount of a peroxide and an epoxy crosslinking agent are blended as a crosslinking agent for a (meth)acrylic polymer containing a specific amount of a carboxyl group-containing monomer. By using the adhesive composition, an adhesive layer capable of suppressing yellowing in a high-temperature, high-temperature, high-humidity environment and suppressing foaming or peeling in a high-temperature, high-temperature, high-humidity environment can be formed. Further, the adhesive layer can be used in various adhesive optical members, for example, in the case of application to a transparent conductive film with an adhesive layer, it can satisfy the requirement of pen-resistant indentation.

The former isocyanate-based crosslinking agent easily causes a dehydrogenation reaction in a high-temperature and high-temperature and high-humidity environment, and particularly an aromatic isocyanate-based crosslinking agent, which easily forms a quinone imine structure (a yellow structure), and thus an isocyanate is used. The adhesive of the crosslinking agent is prone to yellowing. In particular, when an isocyanate crosslinking agent is used in the presence of a peroxide, the yellowing of the adhesive is remarkable. On the other hand, in the present invention, an epoxy-based crosslinking agent is used as a crosslinking agent for the adhesive, whereby yellowing can be suppressed even in the case of using a peroxide. Further, when an epoxy-based crosslinking agent is used, yellowing can be suppressed even when a specific amount of an isocyanate crosslinking agent is used in combination.

Further, the peroxide generates a radical by heating to cause crosslinking in the main chain of the (meth)acrylic polymer, and on the other hand, the epoxy-based crosslinking agent is introduced to and from the copolymerization component. The carboxyl group of the carboxyl group-containing monomer in the (meth)acrylic polymer reacts to cause crosslinking. In this manner, by setting the adhesive layer obtained by crosslinking the adhesive composition containing the peroxide and the epoxy-based crosslinking agent as a crosslinking agent, it is easy to set the gel fraction and the storage elastic modulus to be relatively small. The high value can suppress foaming and peeling in a high-temperature, high-temperature, high-humidity environment, and is also preferable in terms of improving the pen-indentation resistance in the transparent conductive film with an adhesive layer. Further, according to the present invention, an adhesive composition using a peroxide and an epoxy crosslinking agent as a crosslinking agent in a carboxyl group-containing (meth)acrylic polymer is crosslinked with a peroxide and an isocyanate. As the adhesive composition of the crosslinking agent, the gel fraction and the storage elastic modulus of the adhesive layer can be set to a higher value than the crosslinking agent having a smaller amount of the crosslinking agent. Therefore, when the isocyanate-based crosslinking agent and the epoxy-based crosslinking agent are used in combination, the ratio of the isocyanate-based crosslinking agent can be suppressed, thereby suppressing yellowing, and suppressing foaming in a high-temperature, high-temperature, high-humidity environment. The occurrence of flaking. Further, in the transparent conductive film with the adhesive layer, the pen-resistant property can be improved.

Hereinafter, the adhesive composition for an optical member of the present invention will be described. The adhesive composition for an optical member of the present invention uses a (meth)acrylic polymer as a matrix polymer, and the (meth)acrylic polymer has an alkyl group having 4 to 14 carbon atoms per 100 parts by weight. The alkyl (meth)acrylate is a monomer unit and contains 0.2 to 20 parts by weight of a carboxyl group-containing monomer as a copolymerization component.

As the alkyl (meth)acrylate, the alkyl group of the alkyl (meth)acrylate may be either a straight chain or a branched chain. The carbon number of the above alkyl group is preferably from 4 to 12, more preferably from 4 to 9. Further, (meth) acrylate means acrylate and/or methacrylate, and has the same meaning as the (meth) group of the present invention.

Specific examples of the alkyl (meth)acrylate include n-butyl (meth)acrylate, a second butyl (meth)acrylate, and a third butyl (meth)acrylate. Isobutyl methacrylate, n-pentyl (meth) acrylate, isoamyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, (meth) acrylate Isoamyl ester, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-decyl (meth)acrylate, (methyl) Isodecyl acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, isotetradecyl (meth) acrylate And n-tridecyl (meth)acrylate, n-tetradecyl (meth)acrylate, octadecyl (meth)acrylate, isostearyl (meth)acrylate, and the like. Among them, n-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and the like can be exemplified, and these may be used singly or in combination.

As the carboxyl group-containing monomer, a polymerizable functional group having an unsaturated double bond such as a (meth) acrylonitrile group or a vinyl group and having a carboxyl group can be used without particular limitation. Examples of the carboxyl group-containing monomer include acrylic acid, methacrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, isoconic acid, maleic acid, and antibutene. Acid, crotonic acid, etc., these may be used singly or in combination. Among these, acrylic acid and methacrylic acid are preferred, and acrylic acid is particularly preferred.

The carboxyl group-containing monomer is used in a proportion of 0.2 to 20 parts by weight based on 100 parts by weight of the alkyl (meth)acrylate. The above ratio of the carboxyl group-containing monomer is preferably from 1 to 15 parts by weight, more preferably from 3 to 10 parts by weight. When the ratio of the carboxyl group-containing monomer is too small, the crosslinking reaction with the epoxy-based crosslinking agent becomes insufficient, and the adhesive layer formed of the adhesive composition is generated in a high-temperature, high-temperature, high-humidity environment. When the foaming or peeling is applied to the transparent conductive film to which the adhesive layer is applied, it is easy to leave an indentation and thus it is not preferable as an adhesive layer for a touch panel. On the other hand, when the ratio of the carboxyl group-containing monomer is too large, the crosslinking is excessive and the adhesion is poor, which is not preferable.

Further, in the above (meth)acrylic polymer, a hydroxyl group-containing monomer may be used as a copolymerization component in addition to the carboxyl group-containing monomer. As the hydroxyl group-containing monomer, a polymerizable functional group having an unsaturated double bond such as a (meth) acrylonitrile group or a vinyl group and having a hydroxyl group can be used without particular limitation. Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, and 3-hydroxypropyl (meth)acrylate. 4-hydroxybutyl acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, (methyl) a hydroxyalkyl (meth) acrylate such as 12-hydroxydodecyl acrylate; hydroxyethyl (meth) acrylamide; and, in addition, acrylic acid (4-hydroxymethylcyclohexyl) A Ester, N-methylol (meth) acrylamide, N-hydroxy (meth) acrylamide, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethyl A diol monovinyl ether or the like, which may be used singly or in combination. Among these, a hydroxyalkyl (meth)acrylate is preferred.

The proportion of the hydroxyl group-containing monomer to be used is preferably 5 parts by weight or less based on 100 parts by weight of the alkyl (meth)acrylate. The above ratio of the hydroxyl group-containing monomer is preferably from 0.01 to 5 parts by weight, more preferably from 0.01 to 2 parts by weight. The durability can be further improved by using a hydroxyl group-containing monomer within the above range.

The copolymerization component of the above-mentioned (meth)acrylic polymer may be used in an amount of 100 parts by weight in addition to the above-mentioned monomers in order to improve the adhesion and the like without departing from the object of the present invention. The monomer other than the above is used in the range of 50 parts by weight or less of the methyl methacrylate and the ester. The proportion of any monomer is more preferably 20 parts by weight or less.

Examples of the above-mentioned arbitrary monomer include an acid anhydride group-containing monomer such as maleic anhydride or isocanic anhydride; a caprolactone adduct of acrylic acid; a styrylsulfonic acid or an allylsulfonic acid; 2-(Methyl)acrylamide amine-2-methylpropanesulfonic acid, (meth)acrylamide, propanesulfonic acid, sulfopropyl (meth)acrylate, (meth)acryloxynaphthalenesulfonic acid A monomer containing a sulfonic acid group, a monomer having a phosphate group such as 2-hydroxyethyl acryloyl phosphate, or the like.

Further, examples of the monomer for the purpose of upgrading include (meth)acrylamide, N,N-dimethyl(meth)acrylamide, and N-butyl(meth)acrylamide. Or (N-substituted) guanamine monomer such as N-methylol (meth) acrylamide or N-methylolpropane (meth) acrylamide; aminoethyl (meth) acrylate; a (meth)acrylic acid alkylaminoalkyl ester monomer such as N,N-dimethylaminoethyl (meth)acrylate or tert-butylaminoethyl (meth)acrylate; Alkoxyalkyl (meth)acrylate monomer such as methoxyethyl acrylate or ethoxyethyl (meth)acrylate; N-(methyl) propylene decyloxymethylene amber Yttrium or N-(methyl)propenyl-6-oxyhexamethylene succinimide, N-(methyl)propenyl-8-oxyoctamethylene amber imine, Amber quinone imine monomer such as N-propylene decylmorpholine; N-cyclohexyl maleimide or N-isopropyl maleimide, N-dodecyl cis a maleimide-based monomer such as enediamine or N-phenylmaleimide; N-methyliconate ylide, N-ethyl itaconate , N-butyl Itaconic Acid Iminoimide, N-octyl Isoic Acid Iridium Imine, N-2-Ethylhexyl Isoic Acid Iridium Imine, N-Cyclohexyl Isoconate Imine, N- An itaconimide monomer such as laurylene orcone quinone.

Further, as the modifying monomer, vinyl acetate, vinyl propionate, N-vinyl pyrrolidone, methyl vinyl pyrrolidone, vinyl pyridine, vinyl piperidone, vinyl pyrimidine may also be used. Vinyl pipe Vinylpyr , vinyl pyrrole, vinyl imidazole, vinyl Oxazole, vinylmorpholine, N-vinyl carboxylic acid decylamine; vinyl monomer such as styrene, α-methylstyrene, N-vinyl caprolactam; acrylonitrile, methacrylonitrile, etc. a cyanoacrylate-based monomer; an epoxy group-containing acrylic monomer such as glycidyl (meth)acrylate; (meth)acrylic acid polyethylene glycol ester; (meth)acrylic acid polypropylene glycol ester; a glycol-based acrylate monomer such as methyl methacrylate or methoxypolypropylene glycol (meth)acrylate; tetrahydrofurfuryl (meth)acrylate, fluorine-containing (meth)acrylic acid An acrylate-based monomer such as an ester, polyoxy(oxy) (meth) acrylate or 2-methoxyethyl acrylate.

The (meth)acrylic polymer of the present invention usually has a weight average molecular weight of from 1,000,000 to 3,000,000. When durability, particularly heat resistance, is considered, it is preferred to use a weight average molecular weight of 1.5 million to 2.5 million. Further, the weight average molecular weight is preferably 1.7 to 2.5 million, more preferably 1.8 to 2.5 million. If the weight average molecular weight is less than 1.5 million, it is not good in heat resistance. Further, when the weight average molecular weight is more than 3,000,000, the adhesion and the adhesion are not good. In addition, the weight average molecular weight is a value calculated by GPC (Gel Permeation Chromatography) and calculated by polystyrene conversion.

For the production of the (meth)acrylic polymer, a known production method such as solution polymerization, bulk polymerization, emulsion polymerization, or various radical polymerization can be appropriately selected. Further, the obtained (meth)acrylic polymer may be any of a random copolymer, a block copolymer, a graft copolymer and the like.

Further, in the solution polymerization, for example, ethyl acetate, toluene or the like is used as a polymerization solvent. As a specific example of solution polymerization, the reaction is carried out by adding a polymerization initiator under an inert gas stream such as nitrogen, and is usually carried out under the reaction conditions of about 50 to 70 ° C for about 5 to 30 hours.

The polymerization initiator, the chain transfer agent, the emulsifier, and the like used in the radical polymerization are not particularly limited, and can be appropriately selected and used. Further, the weight average molecular weight of the (meth)acrylic polymer can be controlled by the use amount of the polymerization initiator, the chain transfer agent, and the reaction conditions, and the appropriate amount can be adjusted according to the types.

Moreover, the adhesive composition for optical members of this invention contains a peroxide and an epoxy-type crosslinking agent as a crosslinking agent.

When the peroxide of the present invention is produced by heating to generate a radical active species and crosslinking the (meth)acrylic polymer in the adhesive composition, it can be suitably used, and workability is considered. Or stability, it is preferred to use a peroxide having a one-minute half-life temperature of 80 ° C to 160 ° C, and more preferably a peroxide having a one-minute half-life temperature of from 90 ° C to 140 ° C. When the one-minute half-life temperature is too low, the reaction may be carried out during storage before application drying, so that the viscosity is increased and coating is impossible. On the other hand, if the one-minute half-life temperature is too high, cross-linking may occur. When the temperature at the time of the reaction becomes high, a side reaction is caused, and a large amount of unreacted peroxide remains, and the crosslinking is progressed over time, which is not preferable.

As the peroxide to be used in the present invention, for example, bis(2-ethylhexyl)peroxydicarbonate (1 minute half-life temperature: 90.6 ° C) and bis(4-t-butylcyclohexyl) may be mentioned. Oxidized dicarbonate (1 minute half-life temperature is 92.1 ° C), di-second-butyl peroxydicarbonate (1 minute half-life temperature is 92.4 ° C), perylene neodecanoate tert-butyl ester (1 minute half-life temperature is 103.5) °C), trihexyl peroxydiacetate (1 minute half-life temperature is 109.1 ° C), tributyl methoxide acetate (1 minute half-life temperature is 110.3 ° C), dilauroyl peroxide ( 1 minute half-life temperature is 116.4 ° C), di-n-octyl peroxide (1 minute half-life temperature is 117.4 ° C), 1,1,3,3-tetramethylbutyl peroxy-2-ethylhexanoate ( 1 minute half-life temperature is 124.3 ° C), bis(4-methylbenzhydryl) peroxide (1 minute half-life temperature is 128.2 ° C), benzoyl peroxide base (1 minute half-life temperature is 130.0 ° C), Tert-butyl isobutyrate (1 minute half-life temperature 136.1 ° C), 1,1-di(perylene peroxide) cyclohexane (1 minute half-life temperature 149.2) )Wait. Among them, in particular, in terms of excellent cross-linking reaction efficiency, it is preferred to use: bis(4-tert-butylcyclohexyl)peroxydicarbonate (1 minute half-life temperature: 92.1 ° C), dilaurin peroxide The base (1 minute half-life temperature is 116.4 ° C), benzoyl peroxide base (1 minute half-life temperature is 130.0 ° C), and the like.

Further, the half-life of the peroxide is an index indicating the decomposition rate of the peroxide, and means a time until the residual amount of the peroxide becomes half. The decomposition temperature for obtaining the half-life at any time or the half-life time at any temperature is described in the manufacturer's product catalog, etc., for example, in the Organic Peroxide Product Catalogue, 9th Edition (2003, 5) Month)" and so on.

The above-mentioned peroxide may be used singly or in combination of two or more kinds, and the amount of the above-mentioned (meth)acrylic polymer is 0.02 to 2 parts by weight based on 100 parts by weight of the above-mentioned (meth)acrylic polymer. Preferably, it is 0.04 to 1.5 parts by weight, and more preferably 0.05 to 1 part by weight. When the amount of the above formulation is too small, crosslink formation is insufficient and durability is insufficient. On the other hand, if the amount of the above-mentioned compounding amount is too large, the crosslinking becomes excessive and the adhesion is poor, which is not preferable.

Further, when a peroxide is used as a polymerization initiator, a peroxide which is not used in the polymerization reaction may be used for the crosslinking reaction, and in this case, the residual amount of the peroxide is quantified. Add as needed to achieve a specific amount of peroxide and use.

Further, the method for measuring the amount of decomposition of the peroxide remaining after the reaction treatment can be measured, for example, by HPLC (High Performance Liquid Chromatography).

More specifically, for example, about 0.2 g of each of the adhesive compositions after the reaction treatment is taken out, immersed in 10 ml of ethyl acetate, and shake-extracted at 25 ° C for 3 hours at 25 ° C with shaking at 120 ° C, and then at room temperature. Let it sit for 3 days. Then, 10 ml of acetonitrile was added, and the mixture was shaken at 120 rpm for 30 minutes at 25 ° C, and about 10 μl of the extract obtained by filtration using a membrane filter (0.45 μm) was injected into HPLC for analysis, and the amount of peroxide after the reaction treatment was used.

Further, the epoxy-based crosslinking agent means an epoxy compound having two or more epoxy groups (glycidyl groups) in one molecule. Examples of the epoxy-based crosslinking agent include ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, diglycidyl terephthalate, spiroglycerol diglycidyl ether, and diglycidylamino group. Cyclohexane, tetraglycidyl xylene diamine, polyglycidyl metaxylene diamine, and the like. These epoxy-based crosslinking agents may be used singly or in combination of two or more.

The epoxy-based crosslinking agent is added in an amount of 0.005 to 0.5 part by weight, preferably 0.01 to 0.2 part by weight, more preferably 0.02%, per 100 parts by weight of the above (meth)acrylic polymer. 0.1 parts by weight. When the amount of the above formulation is too small, the adhesive layer formed of the adhesive composition may be foamed and peeled off in a high-temperature, high-temperature, high-humidity environment, and in the case of being applied to a transparent conductive film with an adhesive layer. It is easy to leave a pen indentation, and it is not good as an adhesive layer for a touch panel. On the other hand, if the amount of the above-mentioned compounding is too large, the crosslinking will become excessive and the adhesion will be poor, which is not preferable.

Further, in the adhesive composition of the present invention, in addition to the peroxide and the epoxy-based crosslinking agent, other crosslinking agents are used in combination as a crosslinking agent, whereby the high-temperature, high-temperature and high-humidity environments can be suppressed. Foaming and peeling. As another crosslinking agent, an isocyanate type crosslinking agent, an amine type crosslinking agent, an aldehyde type crosslinking agent, an anthraquinone type crosslinking agent, an aziridine type crosslinking agent, and an imide type crosslinking agent can be used. , polyvalent metal salts, polyvalent metal alkoxides, polyvalent ammonium salts, and the like. As the crosslinkable agent which can be used in combination, an isocyanate crosslinking agent is preferred in order to improve adhesion to the first transparent plastic film substrate. Any of the above-mentioned crosslinking agents is usually used in an amount of 0.5 part by weight or less based on 100 parts by weight of the above (meth)acrylic polymer.

Examples of the isocyanate crosslinking agent include toluene diisocyanate, chlorophenylene diisocyanate, 2,4-toluene diisocyanate, 4,4′-diphenylmethane diisocyanate, and benzodiamethylene diisocyanate. An aromatic diisocyanate such as polymethylene polyphenyl isocyanate; a lower aliphatic diisocyanate such as tetramethylene diisocyanate or hexamethylene diisocyanate; cyclopentyl diisocyanate or cyclohexyl diisocyanate; An alicyclic isocyanate such as isophorone diisocyanate or a hydrogenated product of the above aromatic diisocyanate; and an addition system obtained by adding a polyhydric alcohol such as the above various isocyanates and trimethylolpropane Isocyanate compound; isocyanurate compound, biuret type compound, and further, polyether polyol, polyester polyol, acrylic polyol, polybutadiene polyol, polyisoprene A urethane prepolymer type polyisocyanate obtained by an addition reaction of an olefin polyol or the like. The isocyanate-based crosslinking agent may be used alone or in combination of two or more. Among the isocyanate-based crosslinking agents, in terms of improving the adhesion to the first transparent plastic film substrate, it is preferred to add an aromatic diisocyanate such as toluene diisocyanate or trimethylolpropane. An addition product such as a polyol is an isocyanate.

When an isocyanate type crosslinking agent is used as the above-mentioned arbitrary crosslinking agent, the compounding amount is preferably 0.01 to 0.5 part by weight based on 100 parts by weight of the above (meth)acrylic polymer, and further preferably It is 0.05 to 0.3 parts by weight. When the amount of the above-mentioned compounding exceeds 0.5 part by weight, the adhesive layer may be yellowed in a high-temperature, high-temperature, high-humidity environment, and the visibility is lowered.

Further, in order to improve the adhesion and durability, a decane coupling agent can be used in the adhesive composition of the present invention. As the decane coupling agent, a known one can be suitably used without particular limitation.

Specific examples thereof include 3-glycidoxypropyltrimethoxydecane, 3-glycidoxypropyltriethoxydecane, and 3-glycidoxypropylmethyldiethoxy group. An epoxy group-containing decane coupling agent such as decane or 2-(3,4-epoxycyclohexyl)ethyltrimethoxydecane; 3-aminopropyltrimethoxydecane, N-2-(amino group B) 3-aminopropylmethyldimethoxydecane, 3-triethoxydecyl-N-(1,3-dimethylbutylidene)propylamine, N-phenyl-γ- An amine group-containing decane coupling agent such as aminopropyltrimethoxydecane; 3-propenyloxypropyltrimethoxydecane, 3-methylpropenyloxypropyltriethoxydecane, etc. ( a methyl propylene-based decane coupling agent; an isocyanate group-containing decane coupling agent such as 3-isocyanate propyl triethoxy decane. In terms of improving durability, it is preferred to use the above decane coupling agent.

The decane coupling agent may be used singly or in combination of two or more kinds thereof. The content of the decane coupling agent is preferably 1 part by weight or less based on 100 parts by weight of the (meth)acrylic polymer. It is preferably 0.01 to 1 part by weight, more preferably 0.02 to 0.6 part by weight, still more preferably 0.05 to 0.3 part by weight. When the compounding amount of the decane coupling agent exceeds 1 part by weight, when the adherend is glass, there is a possibility that the adhesion force is excessively increased to cause a rework failure.

Furthermore, other known additives may be contained in the adhesive composition of the present invention, for example, powders such as coloring agents and pigments, dyes, surfactants, plasticizers, tackifiers, and surfaces may be appropriately added depending on the intended use. Lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particulates, foils, and the like. Further, a redox system to which a reducing agent is added may be used within a controllable range.

The adhesive layer is formed using the above-described adhesive composition of the present invention. For example, an adhesive layer is formed on at least one side of an optical member, and it can be used as an adhesive type optical member. The method of forming the pressure-sensitive adhesive layer can be carried out, for example, by applying the above-mentioned pressure-sensitive adhesive composition to a release film or the like, drying and removing a polymerization solvent or the like to form an adhesive layer, and then transferring the same. In the optical member (for example, the first transparent plastic film substrate in the transparent conductive film with the adhesive layer, and the optical film for the image display device in the optical film with the adhesive layer); or, The adhesive composition is applied onto the optical member, and the polymerization solvent or the like is dried to form an adhesive layer on the optical member. Further, when the adhesive is applied, one or more solvents other than the polymerization solvent may be appropriately added.

As a method of forming the adhesive layer, various methods can be employed. Specific examples thereof include roll coating, contact roll coating, gravure coating, reverse coating, roll coating, spray coating, dip roller coating, bar coating, blade coating, and air knife coating. A curtain coating method, a lip coating method, or a method such as an extrusion coating method using a die coater or the like.

The thickness of the adhesive layer is not particularly limited and is, for example, about 1 to 100 μm. It is preferably 5 to 50 μm, more preferably 10 to 30 μm.

Further, when the thickness of the adhesive layer is too thin, it is likely to leave a pen impression when applied to a transparent conductive film with an adhesive layer, and it is not preferable as an adhesive layer for a touch panel. On the other hand, if it is too thick, the transparency is impaired, or it is difficult to obtain good results in the formation of the adhesive layer or the adhesion to various adherends, and in terms of cost.

In the case where the above adhesive layer is exposed, the release film (spacer) can be used to protect the adhesive layer until it is actually used.

The constituent material of the release film may, for example, be a plastic film such as polyethylene, polypropylene, polyethylene terephthalate or polyester film; a porous material such as paper, cloth or non-woven fabric; A suitable thin layer or the like of a material, a foamed sheet, a metal foil, and the like, but a plastic film is preferably used in view of excellent surface smoothness.

The plastic film is not particularly limited as long as it is a film that can protect the pressure-sensitive adhesive layer, and examples thereof include a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, and a polymethylpentene film. , polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film Wait.

The thickness of the release film is usually 5 to 200 μm, preferably about 5 to 100 μm. If necessary, the release film may be subjected to a release treatment using a polyfluorene-based, fluorine-based, long-chain alkyl-based or fatty acid-amide-based release agent, cerium oxide powder, or an antifouling treatment, or Antistatic treatment such as coating type, kneading type, vapor deposition type, or the like is performed. In particular, by appropriately performing a release treatment such as polyfluorination treatment, long-chain alkyl treatment, or fluorine treatment on the surface of the release film, the release property of the release film from the adhesive layer can be further improved.

The release film used in the production of the above adhesive layer can be directly used as a release film of the adhesive layer, which can be simplified in terms of steps.

Further, when the above adhesive layer is formed, the adhesive layer is crosslinked by a crosslinking agent. In the present invention, a peroxide and an epoxy-based crosslinking agent are used as the crosslinking agent, but it is preferred to adjust the amounts of these additions while taking into consideration the effects of the crosslinking treatment temperature or the crosslinking treatment time.

The adjustment of the crosslinking treatment temperature and the crosslinking treatment time is, for example, preferably set so that the decomposition amount of the peroxide contained in the adhesive composition is 50% by weight or more, and further preferably set so as to be The amount of decomposition of the oxide is 60% by weight or more, and more preferably, the amount of decomposition of the peroxide is 70% by weight or more. When the amount of decomposition of the peroxide is less than 50% by weight, the amount of the peroxide remaining in the adhesive composition increases, and sometimes the crosslinking reaction may occur over time after the crosslinking treatment, so it is good.

More specifically, for example, if the crosslinking treatment temperature is a one-minute half-life temperature, the decomposition amount of the peroxide is 50% by weight in one minute, and the decomposition amount of the peroxide is 75% by weight in two minutes, so that it is necessary to make the crosslinking The joint processing time is more than 1 minute. Further, for example, if the half life (half-life) of the peroxide at the crosslinking treatment temperature is 30 seconds, the crosslinking treatment time must be 30 seconds or longer, and, for example, if the crosslinking treatment temperature is exceeded. When the half life (half-life) of the oxide is 5 minutes, the crosslinking treatment time must be 5 minutes or longer.

Thus, depending on the peroxide used, the crosslinking treatment temperature and the crosslinking treatment time can be calculated by the following method: assuming that the peroxide is once a ratio, calculated by a theoretical calculation from the half-life (half-life), and Adjust the amount of addition as appropriate. On the other hand, the higher the temperature, the higher the possibility of side reactions, and therefore the crosslinking treatment temperature is preferably 170 ° C or lower.

Further, the crosslinking treatment may be carried out at a temperature at the drying step of the adhesive layer, or may be carried out by providing another crosslinking treatment step after the drying step.

Further, the crosslinking treatment time can be set in consideration of productivity and workability, and is usually about 0.2 to 20 minutes, preferably about 0.5 to 10 minutes.

The storage elastic modulus (G') of the above adhesive layer at 23 ° C is preferably from 20,000 to 500,000 Pa. When the adhesive layer is used as a transparent conductive film with an adhesive layer, the storage elastic modulus (G') of the adhesive layer is more preferably from 70,000 to 200,000 Pa, more preferably from 80,000 to 1,800,000 Pa. On the other hand, when the adhesive layer is used for an optical film such as a polarizing plate, the storage elastic modulus (G') of the adhesive layer is preferably from 30,000 to 200,000 Pa from the viewpoint of suppressing unevenness. More preferably, it is 70,000 to 200,000 Pa, and even more preferably 75,000 to 150,000 Pa. When the storage elastic modulus (G') is excessively less than 20,000 Pa, it is not preferable in terms of appearance defects and foaming at the time of heating, and is also easy to use as a transparent conductive film with an adhesive layer. The pen indentation is left, and thus the adhesive layer for the touch panel is not good. On the other hand, if the storage elastic modulus (G') is excessively larger than 500,000 Pa, the adhesion is inferior, which is not preferable.

Further, the storage elastic modulus (G') in the present invention is described in JIS-K-7244-1 Plastic-Dynamic Mechanical Properties Test Method - Part 1 : General Principles, which is one of the dynamic mechanical properties, and the present invention is described. G' is the value obtained by using the torsional deformation mode in part 2 of Table 4 of JIS-K7244-1. Further, specifically, it is carried out by the method described in the examples.

If the stress is considered to be energy per unit volume, when mechanical energy is applied from the outside to the polymer test piece for sinusoidal motion, a part of the applied energy is stored in the polymer due to elasticity, and the remainder is converted into internal friction due to internal friction. It disappeared with heat. At this time, the temperature rise due to heat generation in the test was very small, so the temperature was approximately constant. Here, the storage elastic modulus G' corresponds to the stored portion, and the loss elastic modulus G" corresponds to a portion that disappears due to internal friction. Therefore, G' is generally considered to be the degree of hardness, and G" is the degree of viscosity.

In the case of an adhesive, G' indicates the degree of stress of the adhesive layer against the force applied from the outside. If G' is large, the stress generated becomes large, and the warpage of the glass also becomes large. On the other hand, if G' is small, it is too soft, and the workability and workability are poor.

Further, the gel fraction of the above adhesive layer is preferably from 70 to 98% by weight. The gel fraction of the above adhesive layer is preferably from 85 to 98% by weight, more preferably from 88 to 95% by weight. When the gel fraction is too small, when it is used as a transparent conductive film with an adhesive layer, it is easy to leave a pen impression, and it is not preferable as an adhesive layer for a touch panel. On the other hand, if the gel fraction is too large, the adhesion is inferior, which is not preferable. The gel fraction can be measured in accordance with the description in the examples.

Further, in the above-mentioned adhesive optical member, an anchor layer may be formed on the surface of the optical member when the adhesive layer is formed, or an adhesive layer may be formed after various easy-to-treat treatment such as corona treatment or plasma treatment. Further, it is also possible to carry out an easy subsequent treatment on the surface of the adhesive layer.

As the above-described easy-to-treat treatment, an anchor layer is preferred, and it is preferred to laminate the adhesive layer and the optical member with an anchor layer. The adhesive layer can utilize the anchor layer to increase the anchoring force. The anchor layer is usually provided on the side of the optical member.

The forming agent for the anchor layer is not particularly limited as long as it is a layer capable of improving the fixing force of the adhesive. Specifically, for example, a decane coupling agent having a reactive functional group such as an amine group, a vinyl group, an epoxy group, a decyl group or a chloro group in the same molecule and a hydrolyzable alkoxyalkyl group can be used, and the same molecule contains a so-called coupling agent such as a titanate coupling agent for a hydrolyzable hydrophilic group and an organofunctional group of titanium, and an aluminate coupling agent having a hydrolyzable hydrophilic group and an organofunctional group containing aluminum in the same molecule An organic reactive group such as an epoxy resin, an isocyanate resin, a polyurethane resin, a polyester resin, a polymer having an amine group in a molecule, or an ester-urethane resin. Resin (polymer).

The anchor layer can be appropriately selected according to the adhesive optical member. For example, when the adhesive optical member is a transparent conductive film with an adhesive layer, it is particularly preferable to contain a decane system from the viewpoint of industrial ease of handling. The layer of the coupling agent.

On the other hand, when the adhesive optical member is an optical film with an adhesive layer, the material for forming the anchor layer is preferably a polymer, and examples thereof include a polyurethane resin and a poly An ester resin or a polymer containing an amine group in a molecule. The polymer containing an amine group in the molecule can ensure good adhesion because the amine group in the molecule reacts with a carboxyl group or the like in the adhesive or exhibits an ionic interaction.

Examples of the polymer having an amine group in the molecule include an amine group such as polyethyleneimine, polyacrylamine, polyvinylamine, polyvinylpyridine, polyvinylpyrrolidine, or dimethylaminoethyl acrylate. a monomeric polymer or the like.

An antistatic agent may also be added to the above anchor layer in order to impart antistatic properties. As the antistatic agent for imparting antistatic properties, an ionic surfactant system; polyaniline, polythiophene, polypyrrole, polyquine a conductive polymer such as a phenyl group; a metal oxide such as tin oxide, cerium oxide or indium oxide; but particularly, in terms of optical properties, appearance, antistatic effect, and stability of an antistatic effect upon heating and humidification From the viewpoint, it is preferred to use a conductive polymer system. Among them, a water-soluble conductive polymer such as polyaniline or polythiophene or a water-dispersible conductive polymer is particularly preferably used. When a water-soluble conductive polymer or a water-dispersible conductive polymer is used as a material for forming the antistatic layer, deterioration of the optical member due to the organic solvent can be suppressed at the time of coating.

The thickness of the anchor layer is not particularly limited and is, for example, about 2 to 200 nm. It is preferably 5 to 150 nm, and more preferably 10 to 100 nm. Further, the formation of the anchor layer can be carried out, for example, by applying a material for forming the anchor layer on the optical member and drying it.

Hereinafter, the adhesive optical member of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view showing an example of an adhesive optical member of the present invention. In the adhesive optical member of Fig. 1, a release film 4 is provided on one surface of the optical member 1 via an adhesive layer 3 for an optical member. As shown in FIG. 2, on the other side of the optical member 1, another layer 2 may be provided. The other layer 2 may also be the adhesive layer 3. Moreover, as shown in FIG. 3, the adhesive layer 3 and the optical member 1 can be laminated via the anchor layer a.

Hereinafter, the transparent conductive film with an adhesive layer of the present invention will be described with reference to the drawings 4 and 5. Fig. 4 is a cross-sectional view showing an example of a transparent conductive film with an adhesive layer of the present invention. The transparent conductive film with an adhesive layer of FIG. 4 has a transparent conductive film 12 on one surface of the first transparent plastic film substrate 11 as an optical member, and is provided on the other surface of the first transparent plastic film substrate 11 via the transparent conductive film 12 The release film 14 is provided on the adhesive layer 13. Fig. 5 is a view showing a case where the transparent conductive film 12 is provided on one surface of the first transparent plastic film substrate 11 via the undercoat layer 15 in the transparent conductive film with the adhesive layer shown in Fig. 4. Further, in FIG. 5, the undercoat layer 15 is described as one layer, but the undercoat layer 15 may be provided with a plurality of layers. On the other surface of the film substrate 11 on which the transparent conductive film 12 is formed, a release film 14 is provided via the adhesive layer 13.

The first transparent plastic film substrate 11 is not particularly limited, but various plastic films having transparency can be used. The plastic film is formed of a single film. For example, examples of the material thereof include polyester resins such as polyethylene terephthalate and polyethylene naphthalate; acetate resins, polyether oximes resins, and polycarbonates. Resin, polyamine resin, polyimide resin, polyolefin resin, (meth)acrylic resin, polyvinyl chloride resin, polyvinylidene chloride resin, polystyrene resin, poly A vinyl alcohol resin, a polyarylate resin, a polyphenylene sulfide resin, or the like. Among these, a polyester resin, a polyimide resin, and a polyether oxime resin are especially preferable.

Further, the polymer film described in JP-A-2001-343529 (WO10/37007) contains, for example, a substituted and/or unsubstituted quinone group having a side chain (A). A thermoplastic resin and (B) a resin composition having a substituted and/or unsubstituted phenyl group and a nitrile group-containing thermoplastic resin in a side chain. Specifically, a polymer film containing a resin composition of an alternating copolymer of isobutylene and N-methylbutyleneimine and an acrylonitrile-styrene copolymer can be used.

The thickness of the film substrate 11 is preferably from 15 to 200 μm, more preferably from 25 to 188 μm. When the thickness of the film substrate 11 is less than 15 μm, the mechanical strength of the film substrate 11 is insufficient, and the film substrate 11 is formed into a roll shape, which may make it difficult to continuously form the transparent conductive film 12. On the other hand, when the thickness exceeds 200 μm, the amount of input is lowered in the film formation process of the transparent conductive film 12, and disadvantages occur in the gas and moisture removal steps, which impairs productivity.

The film substrate 11 may be subjected to an etching treatment or a primer treatment such as sputtering, corona discharge, flame, ultraviolet ray irradiation, electron beam irradiation, chemical conversion, oxidation, or the like in advance to improve the transparency provided thereon. The adhesion of the conductive film 12 or the undercoat layer 15 to the film substrate 11 described above. Further, before the transparent conductive film 12 or the undercoat layer 15 is provided, dust removal and purification may be performed by solvent cleaning or ultrasonic cleaning as needed.

The constituent material of the transparent conductive film 12 is not particularly limited, and for example, a metal oxide containing indium oxide containing tin oxide or tin oxide containing antimony is preferably used.

As a constituent material of the transparent conductive film 12, indium oxide containing tin oxide is preferable. Preferably, the metal oxide contains 90 to 99% by weight of indium oxide and 1 to 10% by weight of tin oxide.

The thickness of the transparent conductive film 12 is not particularly limited, and in order to form a continuous film having a surface resistance of 1 × 10 ³ Ω/□ or less and having good conductivity, the thickness is preferably 10 nm or more. If the film thickness is too thick, transparency is lowered, and the like, and therefore it is preferably 15 to 35 nm, and more preferably 20 to 30 nm. If the thickness is less than 15 nm, the surface resistance becomes high and it is difficult to form a continuous film. Moreover, when the thickness exceeds 35 nm, the transparency is lowered.

The method for forming the transparent conductive film 12 is not particularly limited, and a conventionally known method can be employed. Specifically, for example, a vacuum deposition method, a sputtering method, and an ion plating method can be exemplified. Further, an appropriate method can be employed depending on the required film thickness.

The undercoat layer 15 may be formed of an inorganic substance, an organic substance, or a mixture of an inorganic substance and an organic substance. For example, examples of the inorganic substance include NaF (1.3), Na ₃ AlF ₆ (1.35), LiF (1.36), MgF ₂ (1.38), CaF ₂ (1.4), BaF ₂ (1.3), and SiO ₂ (1.46). Inorganic substances such as LaF ₉ (1.55), CeF ₃ (1.63), and Al ₂ O ₃ (1.63) [The numerical value in () of each of the above materials is a refractive index of light]. Among these, SiO ₂ , MgF ₂ , Al ₂ O ₃ and the like are preferably used. Particularly preferred is SiO ₂ . In addition to the above, a composite oxide containing about 10 to 40 parts by weight of cerium oxide and about 0 to 20 parts by weight of tin oxide with respect to indium oxide may be used.

The undercoat layer formed of an inorganic material can be formed by a dry method such as a vacuum deposition method, a sputtering method, or an ion plating method, or a wet method (coating method). As the inorganic substance forming the undercoat layer, SiO ₂ is preferred as described above. In the wet method, a SiO ₂ film can be formed by coating a cerium oxide sol or the like.

Further, examples of the organic substance include an acrylic resin, a urethane resin, a melamine resin, an acid alcohol resin, a decane-based polymer, and an organic decane condensate. At least one of these organic substances is used. In particular, as the organic substance, it is preferred to use a thermosetting resin composed of a mixture of a melamine resin and an acid alcohol resin and an organic decane condensate.

When the plurality of undercoat layers 15 are formed, in terms of the processability of the transparent conductive film with the adhesive layer obtained, it is preferred that the number of the undercoat layers of the first layer is from the number of the transparent plastic film substrates 11 The undercoat layer formed by the organic substance and farthest from the transparent plastic film substrate 11 is formed of an inorganic substance. Therefore, when the undercoat layer 15 is two layers, it is preferred that the undercoat layer of the first layer is formed of an organic substance from the transparent plastic film substrate 11, and the second layer is formed of an inorganic substance.

The thickness of the undercoat layer 15 is not particularly limited. However, the optical design and the effect of preventing the generation of oligomers in the film substrate 11 are usually about 1 to 300 nm, preferably 5 to 300 nm. Further, when two or more undercoat layers 15 are provided, the thickness of each layer is about 5 to 250 nm, preferably 10 to 250 nm.

Further, although not shown in Figs. 4 and 5, it is preferable to provide an oligomer-preventing layer between the film substrate 11 and the adhesive layer 13. Further, as a material for forming the anti-moving layer, a suitable material for forming a transparent film may be used, and it may be a composite material of an inorganic substance, an organic substance or the like. The film thickness is preferably from 0.01 to 20 μm. Further, in order to form the anti-moving layer, a coating method using a coater, a spray method, a spin coating method, an in-line coating method, or the like is often used, but a vacuum deposition method, a sputtering method, an ion plating method, or a spray may be employed. Thermal decomposition method, electroless plating method, plating method. In the coating method, a resin component such as an acrylic resin, an urethane resin, a melamine resin, a UV curable resin, or an epoxy resin, or the like may be used, or such an inorganic material such as alumina, ceria or mica. a mixture of particles. Alternatively, the base material component may have a function of a movement preventing layer by co-extruding two or more polymer substrates. Further, in the methods of vacuum vapor deposition, sputtering, ion plating, spray pyrolysis, electroless plating, or electroplating, gold, silver, platinum, palladium, copper, aluminum, nickel, chromium, titanium may be used. Or iron, cobalt or tin, or a metal composed of such alloys; or indium oxide, tin oxide, titanium oxide, cadmium oxide or a metal oxide composed of such a mixture; Other metal compounds that make up.

As shown in FIG. 3, the adhesive layer 13 can use the anchor layer a to improve the fixing force as described above. The anchor layer is usually provided on the side of the film substrate 11.

The method for producing the transparent conductive film with an adhesive layer of the present invention is not particularly limited as long as it is a method for obtaining the above-described constituents. Usually, the adhesive layer 13 is formed on one surface of the first transparent plastic film substrate 11 to form a transparent conductive film 12 (which may include the undercoat layer 15) to form a transparent conductive film, and is formed on the transparent conductive layer. The other side of the membrane. The adhesive layer 13 may be formed directly on the film substrate 11 as described above, or the adhesive layer 13 may be provided on the release film 14 in advance and attached to the film substrate 11. According to the latter method, the film substrate 11 can be formed into a roll shape and the adhesive layer 13 can be continuously formed, which is more advantageous in terms of productivity.

In the transparent conductive film with the adhesive layer described above, the second transparent plastic film substrate 11' is further bonded to the adhesive layer 13, and as shown in Fig. 6, a transparent conductive laminated body can be formed.

Moreover, the second transparent plastic film substrate 11' can be attached to the second transparent plastic film substrate 11' in advance, and the film substrate 11 can be attached thereto; The above-mentioned adhesive layer 13 is provided on the film substrate 11 in advance, and the second transparent plastic film substrate 11' is bonded thereto. According to the latter method, the film substrate 11 can be formed into a roll shape to continuously form the adhesive layer 13, which is more advantageous in terms of productivity.

As shown in FIG. 6, the second transparent plastic film substrate 11' may be formed in a single layer structure, or may be formed by laminating two or more layers of the second transparent plastic film substrate 11' with a transparent adhesive layer. The composite structure further improves the mechanical strength and the like of the entire laminated body. Further, Fig. 6 is a view in which the second transparent plastic film substrate 11' is bonded to the transparent conductive film with the adhesive layer shown in Fig. 4, but the adhesive layer of the adhesive layer shown in Fig. 5 is transparent. In the conductive film, a transparent conductive laminate in which the second transparent plastic film substrate 11' is bonded together can be formed in the same manner.

Hereinafter, a case where a single layer structure is used as the second transparent plastic film substrate 11' will be described. When the transparent plastic laminated body is required to have flexibility after bonding the second transparent plastic film substrate 11' having a single-layer structure, the thickness of the second transparent plastic film substrate 11' is usually 6~. About 300μm. In the case where flexibility is not particularly required, a glass plate having a transparent substrate having a thickness of about 0.05 to 10 mm or a film-like or plate-shaped plastic is usually used. As for the material of the plastic, the same as the above-mentioned film substrate 11 can be mentioned. When a plurality of layers are used as the second transparent plastic film substrate 11', it is also preferable to set the same thickness as described above.

In the transparent conductive laminate, a hard coat layer may be provided on one or both sides of the second transparent plastic film substrate. In Fig. 7, a hard coat layer 6 is provided on one side of the second transparent plastic film substrate 11' (the surface not bonded to the adhesive layer 13). The hard coat layer is obtained by subjecting the second transparent plastic film substrate to a hard coat treatment. The hard coat treatment can be carried out, for example, by applying a hard resin such as an acryl-urethane-based resin or a siloxane-based resin, followed by a hardening treatment. When the hard coating treatment is carried out, the surface of the hard resin such as the above-mentioned acrylic acid-urethane-based resin or a siloxane-based resin is blended with a polyfluorene resin to roughen the surface, and when it is actually used as a touch panel or the like, It is also possible to simultaneously form a non-glare surface that prevents writing due to specular action.

If the thickness of the hard coat layer is thin, the hardness may become insufficient. On the other hand, if the thickness of the hard coat layer is too thick, cracks may occur. Further, in consideration of the characteristics of preventing curling, etc., the thickness of the preferred hard coat layer is about 0.1 to 30 μm.

Further, if necessary, in addition to the hard coat layer, an anti-glare may be provided on the outer surface of the second transparent plastic film substrate (the surface not bonded to the adhesive layer 13) for the purpose of improving visibility. Processing layer or anti-reflection layer.

The transparent conductive film or the transparent conductive laminated body with the adhesive layer of the present invention can be used for formation of various devices such as a touch panel or a liquid crystal display. In particular, it can be preferably used as an electrode plate for a touch panel. The touch panel is suitable for various detection methods (such as resistive film method, electrostatic capacity method, etc.).

In the resistive film type touch panel, the transparent conductive film is opposed to each other, and the touch panel electrode panel having the transparent conductive film on the touch side and the display side having the transparent conductive film are touched The electrode plate for the panel is disposed opposite to the spacer, and the electrode panel for the touch panel formed by the transparent conductive film of the present invention can also be used for the touch panel on either side of the touch side or the display side. Use the electrode plate. In particular, in order to suppress the generation of Newton's rings, to satisfy durability and display characteristics, and to reduce the thickness of the touch panel, the transparent conductive film with the adhesive layer of the present invention or the touch of the transparent conductive laminated body is used. The electrode plate for a panel is preferably used as an electrode plate for a touch panel on the display side.

On the other hand, in the touch panel of the electrostatic capacitance type, a transparent conductive film having a transparent conductive film having a specific pattern shape is usually formed on the entire surface of the display portion of the display. In FIGS. 4 to 7, although the transparent conductive film 12 is not patterned, it is preferably used as a patterning, and the patterned transparent conductive film is suitably laminated and used.

Further, the adhesive optical member of the present invention can be used as an optical film using the optical film for an image display device as the adhesive layer of the optical member 1 in Fig. 1 .

The optical film is formed by an image display device such as a liquid crystal display device or an organic EL display device, and the type thereof is not particularly limited. For example, a polarizing plate is mentioned as an optical film. The polarizing plate is generally used to have a transparent protective film on one or both sides of the polarizing element.

The polarizing element is not particularly limited, and various types can be used. The polarizing element may, for example, adsorb iodine or dichroism in a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, or an ethylene-vinyl acetate copolymer partially saponified film. The dichroic substance of the dye is further uniaxially stretched; a polyene-based alignment film such as a dehydrated material of polyvinyl alcohol or a dehydrochlorination treatment of polyvinyl chloride. Among these, a polarizing element composed of a polyvinyl alcohol-based film and a dichroic substance such as iodine is preferable. The thickness of the polarizing elements is not particularly limited, but is generally about 5 to 80 μm.

A polarizing element obtained by dyeing a polyvinyl alcohol-based film with iodine and then uniaxially stretching can be produced, for example, by immersing polyvinyl alcohol in an aqueous solution of iodine to carry out dyeing, and then extending to the original length. 3 to 7 times. If necessary, it may be immersed in an aqueous solution of potassium iodide or the like which may contain boric acid, zinc sulfate, zinc chloride or the like. Further, if necessary, the polyvinyl alcohol-based film may be immersed in water and washed with water before dyeing. The polyvinyl alcohol-based film can be washed with water to wash the dirt or the anti-caking agent on the surface of the polyvinyl alcohol-based film, and the polyvinyl alcohol-based film can be swollen to prevent unevenness in dyeing unevenness. The stretching may be carried out after dyeing with iodine, or may be carried out while dyeing, or may be dyed with iodine after stretching. It can also be extended in an aqueous solution or a water bath such as boric acid or potassium iodide.

As the material constituting the transparent protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, and isotropic property can be used. Specific examples of the thermoplastic resin include a cellulose resin such as triethyl fluorene cellulose, a polyester resin, a polyether oxime resin, a polyfluorene resin, a polycarbonate resin, a polyamide resin, and a polyimine. Resin, polyolefin resin, (meth)acrylic resin, cyclic polyolefin resin An olefinic resin), a polyarylate resin, a polystyrene resin, a polyvinyl alcohol resin, and a mixture thereof. Further, the transparent protective film is bonded to one side of the polarizing element by the adhesive layer, and the (meth)acrylic, urethane-based or urethane-based urethane-based system can be used on the other side. A thermosetting resin such as an epoxy resin or a polyoxymethylene resin or an ultraviolet curable resin is used as a transparent protective film. One or more optional additives may be contained in the transparent protective film. As the additive, for example, an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a colorant, and the like can be given. The content of the above thermoplastic resin in the transparent protective film is preferably from 50 to 100% by weight, further preferably from 50 to 99% by weight, more preferably from 60 to 98% by weight, particularly preferably from 70 to 97% by weight. . When the content of the thermoplastic resin in the transparent protective film is 50% by weight or less, the high transparency and the like which the thermoplastic resin originally has cannot be sufficiently exhibited.

In addition, examples of the optical film include a reflector or a counter-transmission plate, a phase difference plate (including a wavelength plate such as 1/2 or 1/4), an optical compensation film, a visual compensation film, and a brightness enhancement film. In the case of forming a liquid crystal display device or the like, it becomes an optical layer. These may be used alone as an optical film, and in actual use, one layer or two or more layers may be used for laminating the polarizing plate.

An optical film in which the optical layer is laminated on a polarizing plate may be formed by sequentially laminating layers in a manufacturing process of a liquid crystal display device or the like. However, in order to form an optical film in advance, the following advantages are obtained: quality stability Excellent in assembly work, etc., and can improve the process of liquid crystal display devices and the like. An appropriate bonding means such as an adhesive layer can be used in the laminate. When the polarizing plate is bonded to another optical layer, the optical axis of the polarizing plate can be appropriately arranged according to the phase difference characteristic of the target or the like.

The optical film with an adhesive layer of the present invention can be suitably used for formation of various image display devices such as liquid crystal display devices. The formation of the liquid crystal display device can be carried out according to the previous method. In other words, the liquid crystal display device is generally formed by appropriately assembling an optical film of a liquid crystal element and an adhesive layer, and a component such as an illumination system as needed, and then adding a driving circuit or the like. However, in the present invention, in addition to the use of the present invention The optical film to which the adhesive layer of the invention is applied is not particularly limited and may be in accordance with the prior art. As the liquid crystal element, for example, any type such as a TN type, an STN type, a π type, a VA type, or an IPS type can be used.

A liquid crystal display device in which an optical film with an adhesive layer is disposed on one or both sides of the liquid crystal element, or a liquid crystal display device such as a backlight or a reflector in an illumination system can be formed. At this time, the optical film of the present invention may be disposed on one side or both sides of the liquid crystal element. In the case where an optical film is provided on both sides, the same may be different or different. Further, when forming a liquid crystal display device, for example, one or two or more diffusion plates, an anti-glare layer, an anti-reflection film, a protective plate, a tantalum array, a lens array plate, a light-scattering plate, and a backlight may be disposed at appropriate positions. Wait for the appropriate parts.

[Examples]

Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited to the following examples. Further, in each of the examples, the parts and % are based on the weight.

<Measurement of molecular weight>

The molecular weight was measured by GPC (Gel Permeation Chromatography).

Analytical device: manufactured by Tosoh, HLC-8120GPC

Data processing device: manufactured by Tosoh Corporation, GPC-8020

Column:

Sample column: manufactured by Tosoh Corporation, G7000H _XL -H+GMH _XL -H+GMH _XL

Column size: 7.8mm Φ × 30cm each (total 90cm)

Flow rate: 0.8ml/min

Injection sample concentration: about 0.1% by weight

Injection volume: 100μl

Column temperature: 40 ° C

Dissolution: tetrahydrofuran

Detector: Differential Refractometer (RI)

Further, the molecular weight was calculated in terms of polystyrene.

<Measurement of gel fraction>

About 0.1 g of the adhesive layer which has just been subjected to the crosslinking treatment prepared in each of the examples and the comparative examples was weighed and weighed to measure the weight W ₁ (g). Then, the above adhesive layer was immersed in about 50 ml of ethyl acetate at 23 ° C for 7 days, and then the soluble component was extracted. Thereafter, the above adhesive layer was taken out from ethyl acetate, and dried at 120 ° C for 2 hours, and the total weight W ₂ (g) was measured. The measured value is determined by the following formula: gel fraction (% by weight) = [(W _{1 -} W ₂ ) / W ₁ ] × 100 as the gel fraction of the adhesive layer (weight) %). Further, after coating, it was stored at room temperature (about 23 ° C) for 7 days, and then the gel fraction was measured.

<Measurement of storage elastic modulus>

Using the adhesive layer produced in each of the examples and the comparative examples, the storage elastic modulus was measured by ARES (viscoelastic spectrometer, manufactured by Leometallic Scientific Co., Ltd.).

Deformation mode: twist

Measuring frequency: fixed frequency 1Hz

Heating rate: 5 ° C / min

Measurement temperature: measured from the vicinity of the glass transition temperature (Tg) of the acrylic polymer up to 200 ° C

Shape: parallel plate 7.9mmΦ

Sample thickness: about 1.8mm (initial installation)

Further, the storage elastic modulus (G') at 23 ° C was read.

Example 1 (Preparation of acrylic polymer)

To a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler, 100 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid, and 0.075 parts by weight of 2-hydroxyethyl acrylate were added as a polymerization initiator 2, 0.2 parts by weight of 2'-azobisisobutyronitrile and 200 parts by weight of ethyl acetate as a polymerization solvent, and after sufficiently replacing with nitrogen, the liquid temperature in the flask was maintained at 55 ° C while stirring under a nitrogen stream. The polymerization was carried out for 10 hours to prepare an acrylic polymer solution. The acrylic polymer had a weight average molecular weight of 2.2 million.

(Preparation of adhesive composition)

0.2 parts by weight of a peroxybenzhydryl peroxide (Nyper BMT, manufactured by Nippon Oil & Fats Co., Ltd.) as a peroxide, diglycidylaminomethylcyclohexane (Mitsubishi Gas) as an epoxy crosslinking agent 0.1 parts by weight of a trimethylolpropane/toluene diisocyanate as an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., Coronate L), 0.05 parts by weight of Tetrad C) And 0.075 parts by weight of a decane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., KBM403) was uniformly mixed and stirred in 100 parts by weight of the solid component of the acrylic polymer solution to prepare an acrylic adhesive solution (solid content: 10.9 weight) %).

(formation of adhesive layer)

The acrylic pressure-sensitive adhesive solution was applied onto a separator having a release-treated polyethylene terephthalate film (thickness: 38 μm), and heated at 155 ° C for 1 minute to form a dried thickness of 22 μm. Adhesive layer. The adhesive layer had a gel fraction of 92% by weight and a storage elastic modulus (G') at 23 ° C of 118,000 Pa.

(formation of undercoat layer)

An anti-moving layer (formed of urethane acrylic ultraviolet curable resin and having a thickness of 1 μm) was provided on one surface of a polyethylene terephthalate film (hereinafter referred to as a PET film) having a thickness of 25 μm. The original is used as a film substrate. A primer layer of a first layer having a thickness of 180 nm was formed on the other side of the film substrate by using a melamine resin: an acid alcohol resin: an organic decane condensate having a weight ratio of 2:2:1. Then, on the first undercoat layer, SiO ₂ is vacuum-deposited by electron beam heating at a vacuum of 1.33 × 10 ^-2 to 2.67 × 10 ^-2 Pa to form a thickness of 40 nm. A two-layer primer (SiO ₂ film).

(Formation of transparent conductive film)

Then, in a gas atmosphere of 5.33×10 ⁻² Pa composed of 80% argon gas and 20% oxygen gas, a reactive sputtering method using 95% by weight of indium oxide and 5% by weight of tin oxide, in the second An ITO film having a thickness of 20 nm was formed on the undercoat layer of the layer to obtain a transparent conductive film. The obtained ITO film was amorphous.

(Production of transparent conductive film with adhesive layer)

The transparent conductive film (the surface on the side where the ITO film is not formed) is bonded to the adhesive layer provided on the release film to form a transparent conductive film with an adhesive layer. The surface resistance of the ITO film was 300 Ω/□. The surface resistance value (Ω/□) of the ITO film was measured using a low resistance meter (Loresta) resistance meter manufactured by Mitsubishi Chemical Corporation.

Example 2

A transparent conductive film with an adhesive layer was prepared in the same manner as in Example 1 except that the isocyanate-based crosslinking agent was not added in the preparation of the pressure-sensitive adhesive composition in Example 1.

Comparative example 1

A transparent conductive film with an adhesive layer was prepared in the same manner as in Example 1 except that the epoxy-based crosslinking agent was not added in the preparation of the adhesive composition in Example 1.

Comparative example 2

A transparent conductive film with an adhesive layer was produced in the same manner as in Example 1 except that the isocyanate crosslinking agent and the epoxy crosslinking agent were not added in the preparation of the adhesive composition in Example 1.

Comparative example 3

In the same manner as in Example 1, except that the epoxy-based crosslinking agent was not added in the preparation of the pressure-sensitive adhesive composition, and the amount of the isocyanate-based crosslinking agent was changed to 0.6 parts by weight. A transparent conductive film with an adhesive layer.

The transparent conductive films with the adhesive layers obtained in Examples 1 and 2 and Comparative Examples 1 to 3 were evaluated as follows. The results are shown in Table 1. In addition, Table 1 shows the content of the carboxyl group-containing monomer (acrylic acid) in the acrylic polymer used in Examples 1 and 2 and Comparative Examples 1 to 3, the type of the crosslinking agent, and the blending amount. The gel fraction of the adhesive layer and the storage elastic modulus (G') at 23 °C.

<Optical characteristics>

After the transparent conductive film with the adhesive layer was heated at 140 ° C for 90 minutes, the adhesive layer side of the transparent conductive film with the adhesive layer was bonded to the glass substrate to prepare a sample. The sample was placed in an environment of 85 ° C, 85% RH and 100 ° C for 500 hours. The hue b* before (initial) and after standing was measured by a high-speed spectrophotometer (DOT-3 type, manufactured by Murakami Color Technology Research Co., Ltd.). Table 1 shows the measured values before (initial) and after standing, and also shows the difference (Δb*) between the measured hue b*.

<Appearance>

Three transparent conductive films with an adhesive layer were prepared and heated at 140 ° C for 90 minutes. The adhesive layer side of one transparent conductive film with an adhesive layer is laminated on the glass substrate, and then the adhesive layer side of the other two adhesive layers of the adhesive layer is sequentially attached to the laminated layer. A sample was prepared by attaching an ITO film of a transparent conductive film of an adhesive layer. The sample was placed in an environment of 85 ° C, 85% RH and 100 ° C for 500 hours. After the above placement, the transparent conductive film of the first (or second) adhesive layer with the adhesive layer and the second (or third) adhesive layer of the sample were visually observed by the following criteria. The foaming and peeling between the films and between the glass and the adhesive layer were evaluated.

○: No foaming or peeling.

×: Foaming and peeling were confirmed.

<adhesiveness>

The surface of the polyethylene terephthalate film (125 Tetolight OES, thickness 125 μm, manufactured by Oike Industrial Co., Ltd.) after the indium tin oxide evaporation treatment was cut into a width with a 2 kg roller. The pressure-sensitive adhesive layer of the transparent conductive film of the adhesive layer of 25 mm was reciprocally crimped once, and after hardening at 23 ° C for 20 minutes, the polyparaphenylene was measured at a speed of 300 mm/min by a tensile tester. The strength of the ethylene glycol dicarboxylate film along with the adhesion layer (N/25 mm) when peeled off in the 180° direction. Evaluation was performed according to the following criteria.

○: 7.0N/25mm or more

Δ: not up to 3.0~7.0N/25mm

<resistant pen indentation>

A polyethylene terephthalate film (GlSPU, manufactured by Kimoto Co., Ltd.) having a hard coat layer is attached to the adhesive layer of the transparent conductive film with the adhesive layer in such a manner that the hard coat layer becomes the outer side. On the other hand, a transparent conductive laminated body (the same configuration as that of Fig. 7; wherein the undercoat layer is not shown in Fig. 7) was produced. The transparent conductive laminated body was placed on a glass plate with a spacer (180 μm) as a spacer so that the undercoat layer side became the upper side. A self-hard coating lateral pen (made of polyacetal) was applied with a certain load (250 g × 30 minutes), and the load was released and left for 1 day, and then the pen marks were visually evaluated from the ITO film side by the following criteria.

○: The pen trace cannot be confirmed.

×: The trace of the pen can be confirmed.

Example 3 (production of polarizing plate)

The polyvinyl alcohol film having a thickness of 80 μm was stretched to 5 times in an aqueous iodine solution at 40° C., and then dried at 50° C. for 4 minutes to obtain a polarizing element. A triacetyl cellulose film having a thickness of 80 μm was attached to both sides of the polarizing element by a polyvinyl alcohol-based resin adhesive to obtain a polarizing plate.

(production of anchor layer)

An aqueous solution having a solid concentration of 0.8% was prepared by using a material for forming an anchor layer (adhesive), that is, a polyurethane resin and a water-soluble polythiophene-based conductive polymer. The ratio of the polyurethane resin to the water-soluble polythiophene-based conductive polymer is the former: the latter = 10:1. This aqueous solution was applied onto one surface of the above polarizing plate so that the thickness after drying became 100 nm, and dried at 80 ° C for 2 minutes to form an anchor layer.

(Production of polarizer with adhesive layer)

In the above, in the first embodiment (formation of the adhesive layer), the adhesive layer provided on the release film is bonded to the anchor layer formed on the polarizing plate to form a polarizing layer with an adhesive layer. board.

Comparative example 4

In the production of the polarizing plate with the adhesive layer of Example 3, the adhesive produced in Comparative Example 3 was used as the adhesive layer provided on the release film, and the adhesive was produced in the same manner as in Example 3. a polarizing plate of the agent layer.

Comparative Example 5

In the production of the polarizing plate with the adhesive layer of Example 3, the adhesive produced in Comparative Example 1 was used as the adhesive layer provided on the release film, and the adhesive was produced in the same manner as in Example 3. a polarizing plate of the agent layer.

Comparative Example 6 (formation of adhesive layer)

An acrylic polymer was prepared in the same manner as in Example 1 except that 5 parts of acrylic acid was not used in the preparation of the acrylic polymer of Example 1. Further, an adhesive composition was prepared in the same manner as in Example 1 except that the acrylic polymer was used, and an adhesive layer was formed using the adhesive composition.

(Production of polarizer with adhesive layer)

In the production of the polarizing plate with the adhesive layer of Example 3, the adhesive layer was produced in the same manner as in Example 3 except that the above-mentioned manufacturer was used as the adhesive layer provided on the release film. Polarizer.

The polarizing plates with the adhesive layers obtained in Example 3 and Comparative Examples 4 to 6 were subjected to the following evaluations. The results are shown in Table 2. In the same manner as in Table 1, Table 2 shows the content of the carboxyl group-containing monomer (acrylic acid) in the acrylic polymer used in Example 3 and Comparative Examples 4 to 6, the type of the crosslinking agent, and the blending amount. The gel fraction of the adhesive layer produced and the storage elastic modulus (G') at 23 °C.

<Optical characteristics>

The adhesive layer side of the polarizing plate with the adhesive layer was attached to the glass substrate to prepare a sample. The sample was placed in an environment of 60 ° C, 95% RH and 100 ° C for 500 hours. The Δab was measured by a high-speed spectrophotometer (DOT-3 type, manufactured by Murakami Color Technology Research Co., Ltd.) in the amount of hue change before (initial) and after standing.

<Appearance>

The adhesive layer side of the polarizing plate with the adhesive layer was attached to the glass substrate to prepare a sample (size: 32 cm × 24 cm). The sample was placed in an environment of 60 ° C, 95% RH and 100 ° C for 500 hours. After the above-mentioned standing, the foaming and peeling between the polarizing plate and the adhesive layer of the adhesive layer in the sample and between the glass and the adhesive layer were visually evaluated by the following criteria.

○: No foaming or peeling.

×: Foaming and peeling were confirmed.

<adhesiveness>

The surface of the polyethylene terephthalate film (125 Tetolight OES, thickness 125 μm, manufactured by Oike Industrial Co., Ltd.) after the indium tin oxide evaporation treatment was cut into 2 kg drums. The adhesive layer side of the polarizing plate with an adhesive layer of 25 mm in width was crimped once, and after hardening at 23 ° C for 20 minutes, the polyethylene terephthalate was measured at a speed of 300 mm/min by a tensile tester. The adhesion strength (N/25 mm) of the glycol ester film together with the adhesive layer peeled off in the 180° direction. Evaluation was performed according to the following criteria.

○: 7.0N/25mm or more

Δ: not up to 3.0~7.0N/25mm

1‧‧‧Optical components (optical film)

2‧‧‧Other layers

3‧‧‧Adhesive layer

4‧‧‧ release film

11‧‧‧First transparent plastic film substrate

11'‧‧‧Second transparent plastic film substrate

12‧‧‧Transparent conductive film layer

13‧‧‧Adhesive layer

14‧‧‧ release film

15‧‧‧Undercoat

16‧‧‧hard coating

A‧‧‧ anchoring layer

Fig. 1 is a cross-sectional view showing an example of an adhesive optical member of the present invention.

Fig. 2 is a cross-sectional view showing an example of an adhesive optical member of the present invention.

Fig. 3 is a cross-sectional view showing an example of an adhesive optical member of the present invention.

Fig. 4 is a cross-sectional view showing an example of a transparent conductive film with an adhesive layer of the present invention.

Fig. 5 is a cross-sectional view showing an example of a transparent conductive film with an adhesive layer of the present invention.

Fig. 6 is a cross-sectional view showing an example of a transparent conductive laminate of the present invention.

Fig. 7 is a cross-sectional view showing an example of a transparent conductive laminate of the present invention.

1. . . Optical member

3. . . Adhesive layer

4. . . Release film

Claims (19)

An adhesive composition for an optical member, which is characterized in that it contains a (meth)acrylic acid alkyl ester having an alkyl group having 4 to 14 carbon atoms as a monomer unit, and contains 0.2 to 20 parts per 100 parts by weight. a (meth)acrylic polymer obtained by using a carboxyl group-containing monomer as a copolymerization component; and 0.02 to 2 parts by weight of a peroxide, and 100 parts by weight of the above (meth)acrylic polymer; 0.005 to 5 parts by weight of an epoxy-based crosslinking agent is used as a crosslinking agent. The adhesive composition for an optical member according to claim 1, wherein the (meth)acrylic polymer further contains 0.01 to 0.5 part by weight of an isocyanate crosslinking agent as a crosslinking agent with respect to 100 parts by weight of the (meth)acrylic polymer. The adhesive composition for an optical member according to claim 1, which further comprises 0.01 to 1 part by weight of a decane coupling agent based on 100 parts by weight of the (meth)acrylic polymer. The adhesive composition for an optical member according to claim 1, wherein the (meth)acrylic polymer further contains 0.01 to 5 parts by weight based on 100 parts by weight of the alkyl (meth)acrylate as a monomer unit. a hydroxyl group-containing monomer. An adhesive layer for an optical member, which is formed by the adhesive composition for an optical member according to claim 1. The adhesive member layer for an optical member according to claim 5, wherein the optical member adhesive layer has a storage elastic modulus (G') at 23 ° C of 20,000 to 500,000 Pa. The adhesive member layer for an optical member according to claim 5, wherein the adhesive member layer for the optical member has a gel fraction of 70 to 98% by weight. The adhesive member layer for an optical member according to claim 5, wherein the optical member adhesive layer has a storage elastic modulus (G') at 23 ° C of 80,000 to 500,000 Pa. An adhesive optical member characterized in that an adhesive layer for an optical member according to claim 5 is formed on at least one surface of the optical member. The adhesive optical member according to claim 9, wherein the adhesive layer and the optical member are laminated via an anchor layer. An adhesive optical member according to claim 10, wherein said anchor layer contains a polymer. An adhesive optical member according to claim 9 which has an adhesive layer on one side of the first transparent plastic film substrate and a transparent conductive film on the other side of the first transparent plastic film substrate. A transparent conductive film of the agent layer. The adhesive optical member according to claim 12, wherein the transparent conductive film is provided on one side of the first transparent plastic film substrate via at least one undercoat layer. A transparent conductive laminated body characterized in that a second transparent plastic film substrate is further bonded to an adhesive layer in an adhesive optical member of a transparent conductive film with an adhesive layer as disclosed in claim 12. The transparent conductive laminate of claim 14, wherein the second transparent plastic film substrate has a hard coat layer on one or both sides. A touch panel characterized in that it will be attached as claimed in claim 12 The adhesive type optical member of the transparent conductive film of the agent layer or the transparent conductive laminated body of the claim 14 is used as a transparent conductive film for a touch panel. An adhesive optical member according to claim 9 which is an optical film having an adhesive layer of an adhesive layer on at least one side of an optical film for an image display device. The adhesive optical member according to claim 17, wherein the optical film is a polarizing plate or a phase difference plate. An image display apparatus characterized by using at least one adhesive optical member of an optical film having an adhesive layer as claimed in claim 17.