TW201842129A - Optical laminate - Google Patents

Abstract

Provided is an optical laminate which has excellent reworkability even if provided with a glass film. An optical laminate according to the present invention is sequentially provided with a glass film, a polarizer and an adhesive layer in this order, while having an adhesive power of 5 N/25 mm or less with respect to glass plates. In one embodiment of the present invention, the thickness of the adhesive layer is from 5 [mu]m to 100 [mu]m. In one embodiment of the present invention, the thickness of the glass film is from 20 [mu]m to 200 [mu]m.

Description

Optical laminate

The present invention relates to an optical laminate.

BACKGROUND OF THE INVENTION Conventionally, in an image display device, a resin film including a polarizing plate is bonded to a substrate of a display element via an adhesive, and the glass film is bonded to the resin film with an adhesive or an adhesive. When manufacturing the image display device, when a poor bonding (displacement position, foreign matter running, etc.) is found, most of the adhesive or adhesive between the glass and the resin film is frozen and cut, and the The resin film is peeled off from the substrate of the display element. However, when the peeling process is employed, the operation is complicated and complicated, thereby causing a problem that the productivity of the image display device is deteriorated.

In addition, in recent years, video display devices have become lighter and thinner, and there is a tendency to be flexible, and an optical layered body made of thin glass has been proposed (Patent Document 1). When it is necessary to peel off the optical layered body using the thin glass, it is difficult to adopt the method of freezing and cutting as described above due to the fragility of the thin glass.

Further, as described above, the optical layered body including glass has a problem of workability (reworkability) when it is peeled off after being bonded to other members, and it is required to improve the reworkability.

PRIOR ART DOCUMENT Patent Document Patent Document 1: International Publication No. 2013-175767

Disclosure of the Invention Problems to be Solved by the Invention The present invention has been made to solve the above-mentioned conventional problems, and an object of the invention is to provide an optical layered body which is excellent in workability although a glass film is provided.

Means for Solving the Problem The optical laminate of the present invention is provided with a glass film, a polarizer, and an adhesive layer in this order, and the adhesive force of the optical laminate to the glass plate is 5 N/25 mm or less. In one embodiment, the thickness of the adhesive layer is 5 μm to 100 μm. In one embodiment, the glass film has a thickness of 20 μm to 200 μm. In one embodiment, the adhesive layer contains a (meth)acrylic adhesive. In one embodiment, the adhesive layer comprises an urethane-based adhesive. According to another aspect of the present invention, an image display device is provided. The image display device includes the above optical laminate. In one embodiment, the image display device includes the optical layered body on the outermost side of the viewing side.

Advantageous Effects of Invention According to the present invention, it is possible to provide an optical layered body having a glass film but excellent reworkability.

The present invention is a configuration of an optical laminate. The optical layered body 100 is provided with a glass film 10, a polarizer 20, and an adhesive layer 30 in this order. The optical layered body 100 may further include a protective film 40 for protecting the polarizing element 20 between the glass film 10 and the polarizer 20 as needed. Although not shown, a protective film may be disposed between the polarizer 20 and the adhesive layer 30 as needed. The glass film 10, the polarizing member 20, and the protective film 40 may be bonded by any appropriate and suitable adhesive or adhesive.

Since the optical layered body 100 of the present invention has the glass film 10, the hardness is high. Further, since the optical layered body 100 of the present invention includes the polarizing material 20 on the other side of the glass film 10, it is possible to prevent the glass film 10 from being damaged and to have excellent impact resistance. It is considered that the present invention can effectively eliminate the impact of the surface of the glass film 10 from the side of the polarizing member 20, so that the impact resistance is good as described above. Further, the glass film 10 has a function of protecting the polarizing member 20. That is, in the present invention, the glass film 10 and the polarizing member 20 each protect each other. Therefore, the protective member can be reduced, and a lightweight and thin optical laminate can be obtained. Further, since the glass film 10 has high gas barrier properties, deterioration of the polarizer 20 can be prevented. Further, since the dimensional change of the glass film 10 is small, expansion or contraction of the optical layered body 100 of the present invention can be suppressed. As a result, the suppressed optical laminate 100 having high durability and peeling or embossing can be obtained.

The adhesive force of the optical layered body of the present invention to the glass sheet is preferably 5 N/25 mm or less, more preferably 3 N/25 mm or less, and still more preferably 1.5 N/25 mm or less. In the present specification, after the adhesive layer side of the optical layered body is bonded to the glass plate, the film is peeled off at a peeling angle of 90° and a peeling speed of 300 mm/min in an environment of a temperature of 23° C. and a humidity of 55%. It was measured by optical laminate. The detailed measurement method will be described later.

Since the optical layered body of the present invention has the adhesion to the glass sheet within the above range, the workability is excellent. More specifically, when the optical layered body is bonded to the attached body (for example, a member constituting the image display device such as a display element substrate), some adverse conditions (for example, positional shift or foreign matter running in, etc.) occur. In this case, if the optical laminate is to be in the above range, the glass film can be prevented from being broken, and it is easy to peel off the adherend.

The lower limit of the adhesion of the optical layered body of the present invention to the glass sheet is preferably 0.005 N/25 mm or more, more preferably 0.01 N/25 mm or more, and still more preferably 0.1 N/25 mm or more. If it is within the above range, it is possible to prevent the occurrence of defects such as peeling or embossing even under high heat and/or high humidity.

The thickness of the optical layered body of the present invention is preferably from 50 μm to 500 μm, more preferably from 100 μm to 300 μm.

The optical layered body of the present invention may further comprise other layers. The other layer may, for example, be an antireflection layer, an antiglare layer, an antistatic layer, a conductive layer or the like. A separator may also be disposed on the surface of the adhesive layer. The separator protects the adhesive layer until the optical laminate is actually used for use.

The optical laminate of the present invention can be applied to an image display device. More specifically, the optical laminate of the present invention can be used for a substrate or the like of a display element of an image display device. In another aspect of the invention, an image display device including the optical layered body described above can be provided. In one embodiment, the optical laminate of the present invention can be disposed on the outermost side of the viewing side of the image display device. The optical laminate as described above can function as a front protective plate of the image display device.

B. Glass Film The above glass film may be any and suitable. When the glass film is classified according to the composition, for example, soda lime glass, boric acid glass, aluminosilicate glass, quartz glass, or the like can be given. Further, the alkali component may be classified into an alkali-free glass or a low-alkali glass. The content of the alkali metal component (for example, Na ₂ O, K ₂ O, and Li ₂ O) of the glass is preferably 15% by weight or less, more preferably 10% by weight or less.

The thickness of the above glass film is preferably from 20 μm to 200 μm, and preferably from 50 μm to 150 μm. When it is in the above range, an optical laminate which is excellent in flexibility and which is not easily broken by the glass film and which is excellent in productivity can be obtained.

The light transmittance of the above glass film at a wavelength of 550 nm is preferably 85% or more. The refractive index of the above glass film at a wavelength of 550 nm is preferably from 1.4 to 1.65.

The density of the above glass film is preferably from 2.3 g/cm ³ to 3.0 g/cm ³ and more preferably from 2.3 g/cm ³ to 2.7 g/cm ³ . If it is a glass film in the above range, a lightweight optical laminate can be obtained.

The method of forming the above glass film can be carried out by any suitable method. In general, the glass film may be melted at a temperature of 1400 ° C to 1600 ° C by melting a mixture of a main raw material such as cerium oxide or alumina, an antifoaming agent such as sodium sulfate or cerium oxide, and a reducing agent such as carbon to form a thin plate. After cooling, it is obtained. The method for forming the glass film may be, for example, a downhole casting method, a melting method, a floating glass plate method, or the like. The glass film formed into a plate shape by these methods can be thinned or improved in smoothness, and therefore can be chemically polished by a solvent such as hydrofluoric acid as needed.

C. Polarizer and Protective Film C-1. Polarizer The thickness of the above polarizer is not particularly limited, and an appropriate thickness can be used depending on the purpose. The thickness represents about 1 μm to 80 μm. In one embodiment, a thin polarizer can be used, and the thickness of the polarizer is preferably 20 μm or less, preferably 15 μm or less, more preferably 10 μm or less, and particularly preferably 6 μm or less. By using the above-described thin polarizer, a thin optical laminate can be obtained.

The polarizer preferably exhibits absorption dichroism at any wavelength from 380 nm to 780 nm. The monomer transmittance of the polarizer is preferably 40.0% or more, more preferably 41.0% or more, more preferably 42.0% or more, and still more preferably 43.0% or more. The polarizing degree of the polarizing member is preferably 99.8% or more, more preferably 99.9% or more, and still more preferably 99.95% or more.

Preferably, the polarizing member is an iodine-based polarizing member. More specifically, the polarizer may be composed of a iodine-containing polyvinyl alcohol-based resin (hereinafter referred to as "PVA-based resin") film.

Any PVA-based resin for forming the PVA-based resin film may be any suitable resin. For example, polyvinyl alcohol or ethylene-vinyl alcohol copolymer can be mentioned. Polyvinyl alcohol can be obtained by saponifying polyvinyl acetate. The ethylene-vinyl alcohol copolymer can be obtained by saponifying an ethylene-vinyl acetate copolymer. The saponification degree of the PVA-based resin is usually from 85 mol% to 100 mol%, preferably from 95.0 mol% to 99.95 mol%, more preferably from 99.0 mol% to 99.93 mol%. The degree of saponification is determined in accordance with JIS K 6726-1994. By using the PVA-based resin having a saponification degree, a polarizing member excellent in durability can be obtained. When the degree of saponification is too high, there will be a gelatinization.

The average degree of polymerization of the PVA-based resin can be appropriately selected depending on the purpose. The average degree of polymerization is usually from 1000 to 10,000, preferably from 1200 to 5,000, more preferably from 1,500 to 4,500. Further, the average degree of polymerization can be obtained in accordance with JIS K 6726-1994.

The method for producing the polarizer is, for example, a method (I) of stretching a PVA-based resin film alone and dyeing, and a method of stretching a layered body (i) having a resin substrate and a polyvinyl alcohol-based resin layer (II) )Wait. The method (I) is a conventional method well known in the art, and detailed description is omitted. The above production method (II) preferably comprises the steps of extending and dyeing the laminate (i) having a resin substrate and a polyvinyl alcohol-based resin layer formed on one side of the resin substrate, and the resin substrate Make polarizers on the top. The layered product (i) can be formed by applying a coating liquid containing a polyvinyl alcohol-based resin to a resin substrate and drying it. Further, the laminated body (i) may be formed by transferring a polyvinyl alcohol-based resin film onto a resin substrate. The details of the above-described production method (II) are described in, for example, Japanese Laid-Open Patent Publication No. 2012-73580, the entire disclosure of which is incorporated herein by reference.

C-2. Protective film The protective film may be any and suitable resin film. Examples of the material for forming the protective film include a polyester resin such as polyethylene terephthalate (PET), a cellulose resin such as triethyl cellulose (TAC), and a cycloolefin system such as a decene-based resin. An olefin resin such as a resin, polyethylene or polypropylene, or a (meth)acrylic resin. Among them, polyethylene terephthalate (PET) is preferred. Further, the "(meth)acrylic resin" means an acrylic resin and/or a methacrylic resin.

In one embodiment, a (meth)acrylic resin having a pentacomilin structure can be used as the (meth)acrylic resin. A (meth)acrylic resin having a pentylene quinone imine structure (hereinafter referred to as a glutarylene imide resin) is described in, for example, JP-A-2006-309033, JP-A-2006-317560 Japanese Patent Laid-Open No. 2006-328329, Japanese Laid-Open Patent Publication No. 2006-328334, Japanese Laid-Open Patent Publication No. Hei. No. 2006-337491, Japanese Laid-Open Patent Publication No. Hei. No. 2006-337492, No. 2006-337493 Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. This specification refers to these descriptions as a reference.

The protective film and the polarizer are laminated by passing through an arbitrary and appropriate adhesive layer. The resin substrate used in the production of the polarizing member can be peeled off before the protective film and the polarizing member are laminated or after lamination.

The thickness of the protective film is preferably 5 μm to 55 μm, more preferably 10 μm to 50 μm, and still more preferably 15 μm to 45 μm.

D. Adhesive Layer The thickness of the adhesive layer is preferably from 5 μm to 100 μm, more preferably from 10 μm to 70 μm. When it is within the above range, the adhesion force can be appropriately adjusted, and the glass film is less likely to be broken at the time of peeling, and it is easy to peel off from the adherend, and an optical laminate having excellent durability of the adhesive layer can be obtained.

The above-mentioned adhesive layer may contain any appropriate and suitable adhesive as long as the effect of the present invention can be obtained. It is preferable that the above adhesive layer contains a (meth)acrylic adhesive and/or an urethane-based adhesive. When these adhesives are used, the adhesion force can be appropriately adjusted, and an optical laminate in which the glass film is less likely to be broken at the time of peeling can be obtained.

D-1. (Meth)acrylic adhesive The (meth)acrylic adhesive contains a (meth)acrylic polymer.

The content ratio of the (meth)acrylic polymer in the (meth)acrylic adhesive is preferably 40% by weight to 99.9% by weight, preferably 50% by weight to 99.5% by weight, more preferably 60% by weight to 99% by weight. .

The (meth)acrylic polymer is a polymer containing a (meth)acrylic monomer as a constituent monomer component. The (meth)acrylic polymer may be used alone or in combination of two or more. The (meth)acrylic monomer may be used alone or in combination of two or more.

The (meth)acrylic polymer preferably contains an alkyl (meth)acrylate as a monomer component constituting the polymer. Examples of the alkyl (meth)acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, and butyl (meth)acrylate. Ester, isobutyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, N-decyl (meth)acrylate, isodecyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, n-dodecyl (meth)acrylate, (A) An alkyl (meth)acrylate having an alkyl group having 1 to 18 carbon atoms such as n-tridecyl acrylate or n-tetradecyl (meth) acrylate. These are preferably alkyl (meth)acrylates having an alkyl group having 4 to 13 carbon atoms, and 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, (methyl) Isooctyl acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecane (meth) acrylate The base ester and n-tridecyl (meth)acrylate are preferred. The alkyl (meth)acrylate may be used alone or in combination of two or more.

The content ratio of the alkyl (meth)acrylate is preferably from 70% by weight to 98% by weight, and from 80% by weight to 98% by weight based on the total monomer component (100% by weight) constituting the (meth)acrylic polymer. Preferably, it is more preferably from 85% by weight to 98% by weight, particularly preferably from 90% by weight to 98% by weight.

The monomer component constituting the (meth)acrylic polymer may also contain a hydroxyl group-containing monomer. Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and 6-hydroxy (meth)acrylate. Hexyl ester, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, (4-hydroxymethylcyclohexyl)methacrylate, N-methylol (meth) acrylamide, vinyl alcohol, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, and the like. The hydroxyl group-containing monomer may be used alone or in combination of two or more.

The content ratio of the hydroxyl group-containing monomer is preferably from 0.1% by weight to 15% by weight, and preferably from 0.5% by weight to 13% by weight based on the total monomer component (100% by weight) constituting the (meth)acrylic polymer. Preferably, 0.5% by weight to 10% by weight is more preferably, and 1% by weight to 8% by weight is particularly preferred.

The monomer component constituting the (meth)acrylic polymer may contain, for example, a polyfunctional monomer from the viewpoint of obtaining a suitable cohesive force by introducing a crosslinked structure into the (meth)acrylic polymer. Examples of the polyfunctional monomer include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, and neopentyl glycol di(a). Acrylate, 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol Methyl) acrylate, divinyl benzene, N, N-methylene bis decyl decylamine, and the like. The polyfunctional monomer may be used alone or in combination of two or more.

The content ratio of the polyfunctional monomer is preferably from 0.1% by weight to 30% by weight, and preferably from 0.1% by weight to 10% by weight based on the total monomer component (100% by weight) of the (meth)acrylic polymer. If it is within the above range, the adhesion force can be appropriately adjusted, and an optical layered body in which the glass film is less likely to be broken at the time of peeling can be obtained.

The monomer component constituting the (meth)acrylic polymer may further contain other monomers. Examples of the other monomer include a cyano group-containing monomer, a vinyl ester monomer, an aromatic vinyl monomer, a guanamine group-containing monomer, a ruthenium group-containing monomer, an amine group-containing monomer, and the like. Epoxy group monomer, vinyl ether monomer, N-propylene fluorenyl group Porphyrin and the like. Among these, from the viewpoint of enhancing cohesive force and heat resistance, a cyano group-containing monomer, a vinyl ester monomer, and an aromatic vinyl monomer are preferable. Further, from the viewpoint of enhancing the adhesion and having a functional group capable of functioning as a crosslinking point, it is preferably a guanamine group-containing monomer, a ruthenium group-containing monomer, an amine group-containing monomer, or the like. Epoxy group monomer, vinyl ether monomer, N-propylene fluorenyl group Porphyrin is preferred. The other monomers may be used alone or in combination of two or more.

Examples of the cyano group-containing monomer include acrylonitrile and methacrylonitrile.

Examples of the vinyl ester monomer include vinyl esters such as vinyl acetate, vinyl propionate, and vinyl laurate.

Examples of the aromatic vinyl monomer include styrene, chlorostyrene, chloromethylstyrene, α-methylstyrene, and other substituted styrenes.

The mercapto group-containing monomer may, for example, be acrylamide, methacrylamide, diethyl acrylamide, N-vinyl pyrrolidone, N,N-dimethyl decylamine, N,N- Dimethyl methacrylamide, N,N-diethyl acrylamide, N,N-diethyl methacrylamide, N,N ́-methylenebis acrylamide, N,N- Dimethylaminopropyl acrylamide, N,N-dimethylaminopropyl methacrylamide, diacetone acrylamide, and the like.

Examples of the mercapto group-containing monomer include cyclohexylmaleimide, isopropylmaleimide, N-cyclohexylmaleimide, and iconimide.

The amine group-containing monomer may, for example, be ethyl (meth) acrylate, N,N-dimethylaminoethyl (meth) acrylate or N,N-dimethylaminopropyl (methyl). ) Acrylate and the like.

Examples of the epoxy group-containing monomer include glycidyl (meth)acrylate, methyl glycidyl (meth)acrylate, and allylepoxypropyl ether.

Examples of the vinyl ether monomer include methyl vinyl ether, ethyl vinyl ether, and isobutyl vinyl ether.

The content ratio of the other monomer is preferably from 0 to 40% by weight, more preferably not more than 0% by weight, and more preferably not more than 40% by weight, based on the total monomer component (100% by weight) of the (meth)acrylic polymer. More preferably, it is more than 0% by weight and more preferably 35% by weight or less, more preferably 0% by weight and more preferably 30% by weight or less.

From the viewpoint of suppressing the increase in the adhesion to the adherend, the monomer component constituting the (meth)acrylic polymer preferably contains no carboxyl group-containing monomer, sulfonic acid group-containing monomer, or phosphoric acid group. Monomer, anhydride group-containing monomer. That is, the other monomer preferably contains no carboxyl group-containing monomer, sulfonic acid group-containing monomer, phosphoric acid group-containing monomer, or acid anhydride group-containing monomer.

The (meth)acrylic polymer can be obtained by polymerizing a monomer component constituting the (meth)acrylic polymer. Examples of the polymerization method include solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization, and photopolymerization (active energy ray polymerization). Among these, from the viewpoint of cost or productivity, solution polymerization is preferred. The obtained (meth)acrylic polymer may be any of a random copolymer, a block copolymer, an alternating copolymer, a graft copolymer, and the like.

The weight average molecular weight of the (meth)acrylic polymer is preferably from 100,000 to 5,000,000, preferably from 200,000 to 4,000,000, and more preferably from 300,000 to 3,000,000.

The glass transition temperature (Tg) of the (meth)acrylic polymer is preferably 0 ° C or lower, more preferably -10 ° C or lower. The glass transition temperature (Tg) is obtained by the following formula when the glass transition temperature of the homopolymer obtained from each monomer is Tgn (° C.). 1/(Tg+273)=Σ[Wn/(Tgn+273)] wherein Tg(°C) represents the glass transition temperature of the copolymer, Wn represents the weight fraction of each monomer, and Tgn (°C) represents each The glass transition temperature of the monomer-derived homopolymer, and n indicates the type of each monomer.

The (meth)acrylic adhesive may contain a crosslinking agent from the viewpoint of obtaining an appropriate cohesive force. Examples of the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, a melamine crosslinking agent, an aziridine crosslinking agent, and a metal chelate crosslinking agent. Among these, an isocyanate-based crosslinking agent or an epoxy-based crosslinking agent is preferred in terms of the effect of the present invention. The crosslinking agent may be used alone or in combination of two or more.

Examples of the isocyanate crosslinking agent include lower aliphatic polyisocyanates such as butyl diisocyanate and hexamethylene diisocyanate, and alicyclic groups such as cyclopentyl diisocyanate, cyclohexyl diisocyanate, and isophorone diisocyanate. Aromatic isocyanates such as isocyanates, toluene 2,4-diisocyanate, 4,4-diphenylmethane diisocyanate, xylylene diisocyanate, trimethylolpropane / xylylene diisocyanate trimer A product (trade name "Coronate L" manufactured by Nippon Polyurethane Industry Co., Ltd.), a trimethylolpropane/hexamethylene diisocyanate trimer adduct (trade name "Coronate HL" Nippon Polyurethane Industry Co., An isocyanate adduct such as a trimeric isocyanate of hexamethylene diisocyanate (trade name "Coronate HX" Nippon Polyurethane Industry Co., Ltd.).

Examples of the epoxy-based crosslinking agent include bisphenol A, epichlorohydrin-based epoxy resin, ethyl ether epoxide, polyethylene glycol diepoxypropyl ether, and glycerin diepoxide. Propyl ether, glycerol triepoxypropyl ether, 1,6-hexanediol epoxypropyl ether, trimethylolpropane triepoxypropyl ether, diepoxypropyl aniline, diamine propylene Amine, N,N,N ́,N ́-tetraepoxypropyl-m-decanediamine (trade name "TETRAD-X" manufactured by Mitsubishi Gas Chemical Co., Ltd.), 1,3-double (N, N-bicyclic) Oxypropylaminomethyl)cyclohexane (trade name "TETRAD-C" manufactured by Mitsubishi Gas Chemical Co., Ltd.).

The blending amount of the crosslinking agent is preferably from 0.01 part by weight to 15 parts by weight, preferably from 0.1 part by weight to 10 parts by weight, based on 100 parts by weight of the (meth)acrylic polymer, and preferably from 0.1 part by weight to 8 parts by weight. More preferably, 0.5 parts by weight to 5 parts by weight is most preferred. When the blending amount of the crosslinking agent with respect to 100 parts by weight of the (meth)acryl-based polymer is within the above range, the adhesion can be appropriately adjusted, and an optical film which is less likely to be broken when peeled off can be obtained. Laminated body.

The (meth)acrylic adhesive may also contain a crosslinking catalyst. Examples of the crosslinking catalyst include metal tetra-n-butyl titanate, tetraisopropyl titanate, iron(III) acetate, butyltin oxide, and dioctyltin dilaurate (especially tin). Cross-linking catalyst). The cross-linking catalyst may be one type or two or more types.

The blending amount of the crosslinking catalyst is preferably from 0.001 part by weight to 0.05 parts by weight, preferably from 0.003 part by weight to 0.04 part by weight, and from 0.005 part by weight to 0.03 part by weight, based on 100 parts by weight of the (meth)acrylic polymer. Better.

The (meth)acrylic adhesive may also contain a crosslinking retarder. Examples of the crosslinking retarder include β-ketoesters such as methyl acetate, ethyl acetate, octyl acetate, oleyl acetate, acetaminophen lauric acid, and stearyl acetate. A β-diketone such as acetone, 2,4-hexanedione or benzamidine. Among these, in view of the effect that the benzene invention can be sufficiently exerted, acetonitrile is preferred. The crosslinking retarder may be used alone or in combination of two or more.

The blending amount of the crosslinking retarder is preferably from 0.1 part by weight to 10 parts by weight, preferably from 0.1 part by weight to 5 parts by weight, based on 100 parts by weight of the (meth)acrylic polymer, and preferably from 0.1 part by weight to 3 parts by weight. Better.

The (meth)acrylic adhesive may contain additives such as a plasticizer, an anti-aging agent, a colorant (pigment or dye), an antistatic agent, and an adhesive resin, without impairing the effects of the present invention. Further, the (meth)acrylic adhesive may contain any appropriate solvent.

D-2. Amino ethane-based adhesive The urethane-based adhesive contains a polyurethane resin.

The content ratio of the polyurethane resin in the urethane-based pressure-sensitive adhesive is preferably from 40% by weight to 99% by weight, more preferably from 50% by weight to 95% by weight, still more preferably from 60% by weight to 90% by weight.

The polyurethane resin may be used alone or in combination of two or more.

The polyurethane resin can be obtained by reacting a polyol (A) with a polyfunctional isocyanate compound (B).

The polyol (A) may be used alone or in combination of two or more.

Examples of the polyol (A) include polyester polyols, polyether polyols, polycaprolactone polyols, polycarbonate polyols, and castor oil polyols.

The polyester polyol can be obtained, for example, by esterification of a polyol component with an acid component.

Examples of the polyol component include ethylene glycol, diethylene glycol, 1,3-butylene glycol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, and 2- But-2-B-1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octane Alcohol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 1,8-nonanediol, octadecanediol, glycerol, trimethylolpropane, neopentyl alcohol, Hexatriol, polypropylene glycol, and the like.

Examples of the acid component include succinic acid, methyl succinic acid, adipic acid, pimelic acid, sebacic acid, sebacic acid, 1,12-dodecanedioic acid, 1,14 tetradecanedioic acid, and dimer. Acid, 2-methyl-1,4-cyclohexanedicarboxylic acid, 2-ethyl-1,4-cyclohexanedicarboxylic acid, p-nonanoic acid, isophthalic acid, citric acid, 1,4-naphthalene dicarboxylate Acid, 4,4'-biphenyldicarboxylic acid, such anhydrides, and the like.

Examples of the polyether polyol include water, a low molecular polyol (propylene glycol, ethylene glycol, glycerin, trimethylolpropane, and neopentyl alcohol), bisphenols (bisphenol A, etc.), and dihydroxybenzene. (Catechol, acid phenolphthalein, hydroquinone, etc.) as a starter, a polyether polyol obtained by addition polymerization of an alkylene oxide such as ethylene oxide, propylene oxide or butylene oxide. Specific examples thereof include polyethylene glycol, polypropylene glycol, and polytetramethylene glycol.

The polycaprolactone polyol may, for example, be a caprolactone-based polyester diol obtained by ring-opening polymerization of a cyclic ester monomer such as ε-caprolactone or σ-valerolactone.

The polycarbonate polyol may, for example, be a polycarbonate polyol obtained by condensation polymerization of the above polyol component and phosgene; the above polyol component and dimethyl carbonate, diethyl carbonate, dipropylene carbonate Ethylene carbonate diesters such as ester, diisopropyl carbonate, dibutyl carbonate, ethyl butyl carbonate, ethyl carbonate, propylene carbonate, diphenyl carbonate, and dibenzyl carbonate are obtained by transesterification condensation. a polycarbonate polyol; a copolymerized polycarbonate polyol obtained by using two or more kinds of the above polyol components; a polycarbonate polyol obtained by esterification reaction of the above various polycarbonate polyols and a carboxyl group-containing compound; a polycarbonate polyol obtained by etherification reaction of a polycarbonate polyol with a hydroxyl group-containing compound; a polycarbonate polyol obtained by transesterification of the above various polycarbonate polyols with an ester compound; and various polycarbonates described above a polycarbonate polyol obtained by transesterification of an ester polyol with a hydroxyl group-containing compound; a polyester-based polycarbon obtained by condensation polymerization of the above various polycarbonate polyols and a dicarboxylic acid compound Esters of polyhydric alcohols; the above polycarbonate polyol with an alkylene oxide obtained by copolymerizing the polyether copolymer of a polycarbonate polyol.

The castor oil polyol can be obtained, for example, by reacting a castor oil fatty acid with the above polyol component to obtain a castor oil-based polyol. Specifically, for example, castor oil fatty acid and polypropylene glycol are reacted to obtain a castor oil-based polyol.

In one embodiment, a polyol (triol) having three OH groups can be used as the polyol (A). When a triol is used, the adhesion can be appropriately adjusted, and an optical laminate in which the glass film is less likely to be broken when peeled off can be obtained. In the polyol (A), the content ratio of the polyol (triol) having three OH groups is preferably from 50% by weight to 100% by weight, and preferably from 70% by weight to 100% by weight, and from 80% by weight to 100% by weight The weight % is preferably 90% by weight to 100% by weight, more preferably 95% by weight to 100% by weight, and most preferably 100% by weight.

The polyol (A) preferably contains a polyol having a number average molecular weight Mn of from 400 to 20,000. In the polyol (A), the content ratio of the polyol having a number average molecular weight Mn of from 400 to 20,000 is preferably from 50% by weight to 100% by weight, preferably from 70% by weight to 100% by weight, more preferably from 90% by weight to 100% by weight. 95% by weight to 100% by weight is particularly preferable, and substantially 100% by weight is optimal.

In one embodiment, when the polyol (A) is a polyol (triol) having three OH groups as an essential component, a trihydric alcohol having a number average molecular weight Mn of 7,000 to 20,000 and a number average molecular weight Mn are used in combination. a trihydric alcohol of 2000 to 6000 and a trihydric alcohol having a number average molecular weight Mn of 400 to 1900, and a trihydric alcohol having a number average molecular weight Mn of 8,000 to 15,000 and a trihydric alcohol having a number average molecular weight of 2,000 to 5,000 may be used in combination. The trihydric alcohol having a number average molecular number Mn of 500 to 1800 is more preferably a trihydric alcohol having a number average molecular weight Mn of 8,000 to 12,000, a trihydric alcohol having a number average molecular weight Mn of from 2,000 to 4,000, and a number average molecular weight Mn of 500-1500 triols. When the three kinds of triols are used in combination, the adhesion can be appropriately adjusted, and an optical laminate in which the glass film is less likely to be broken at the time of peeling can be obtained.

The polyfunctional isocyanate compound (B) may be used alone or in combination of two or more.

The polyfunctional isocyanate compound (B) may be any and suitable polyfunctional isocyanate compound which can be used for the ureidoethylation reaction. Examples of the polyfunctional isocyanate compound (B) include a polyfunctional aliphatic isocyanate compound, a polyfunctional alicyclic isocyanate, and a polyfunctional aromatic isocyanate compound.

Examples of the polyfunctional aliphatic isocyanate compound include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propyl propyl diisocyanate, and 1,3. - butyl diisocyanate, dodecyl diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, and the like.

Examples of the polyfunctional alicyclic isocyanate compound include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, and hydrogenated diphenyl. Methane diisocyanate, hydrogen decyl diisocyanate, hydrogenated diisocyanate, tetramethyl decyl diisocyanate, and the like.

Examples of the polyfunctional aromatic diisocyanate compound include phenyl diisocyanate, toluene 2,4-diisocyanate, toluene 2,6-diisocyanate, and 2,2'-diphenylmethane. Isocyanate, 4,4'-diphenylmethane diisocyanate, 4,4'-toluidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5- Naphthalene diisocyanate, decyl diisocyanate, and the like.

The polyfunctional isocyanate compound (B) may, for example, be a trimethylolpropane adduct of various polyfunctional isocyanate compounds, a biuret formed by reacting with water, a terpolymer having a triisocyanurate ring, or the like. . Moreover, these can also be used in combination.

In the polyol (A) and the polyfunctional isocyanate compound (B), the equivalent ratio of the NCO group to the OH group is more than 1.0 and less than 5.0 and more preferably from 5.0 to 5.0, and preferably from 1.1 to 5.0, based on the NCO group/OH group. 1.5~3.5 is better, 1.8~3.0 is the best.

The polyurethane-based adhesive preferably contains an anti-deterioration agent such as an antioxidant, an ultraviolet absorber, or a light stabilizer. The anti-deterioration agent may be used alone or in combination of two or more. The anti-deterioration agent is particularly excellent as an antioxidant.

Further, the urethane-based pressure-sensitive adhesive may contain any appropriate and appropriate other components within the range which does not impair the effects of the present invention. The other component may, for example, be a resin component other than a polyurethane resin, a tackifier, an inorganic filler, an organic filler, a metal powder, a pigment, a foil, a softener, a plasticizer, or an anti-aging agent. Agent, conductive agent, ultraviolet absorber, antioxidant, light stabilizer, surface lubricant, leveling agent, preservative, heat stabilizer, polymerization inhibitor, lubricant, solvent, etc.

The urethane adhesive may also contain a modified polyoxyxide oil.

When the urethane-based adhesive comprises a modified polyoxyxene oil, it is preferably contained in an amount ratio of from 0.001 part by weight to 50 parts by weight, based on 100 parts by weight of the polyurethane resin. It is preferably -40 parts by weight, more preferably 0.01 parts by weight to 30 parts by weight, more preferably 0.01 parts by weight to 20 parts by weight, and most preferably 0.01 parts by weight to 10 parts by weight.

The modified polyoxygenated oil can employ any and suitable modified polyoxygenated oil within the scope of the effects of the present invention. The modified polyoxygenated oil may, for example, be a modified polyoxygenated oil obtainable from Shin-Etsu Chemical Co., Ltd. Moreover, the modified polyoxygenated oil is preferably a polyether modified polyoxygenated oil. Examples of the polyether modified polyoxyxene oil include a side chain type polyether modified polyoxygenated oil, and a two-terminal type polyether modified polyoxygenated oil. Example

Hereinafter, the present invention will be specifically described by examples, but the present invention is not limited by the examples. Further, the "parts" and "%" in the examples are based on weight unless otherwise stated.

[Production Example 1] Production of polarizer A An amorphous polyethylene terephthalate (hereinafter also referred to as "PET") (IPA copolymerized PET) film having a 7 mol% isodecanoic acid unit (thickness: 100 μm) was prepared. As a thermoplastic resin substrate, a corona treatment (58 W/m ² /min) was applied to the surface. On the other hand, it is prepared to add 1 wt% of ethyl hydrazide-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: GOHSEFIMER Z200 (average degree of polymerization: 1200, degree of saponification: 98.5 mol%, acetamidine) PVA (degree of polymerization: 5 mol%) of PVA (degree of polymerization 4200, degree of saponification: 99.2%), and a coating liquid of PVA-based resin of 5.5 wt% of PVA aqueous solution was prepared so that the film thickness after drying became 12 μm. After coating, it was dried by hot air drying in a gas atmosphere of 60 ° C for 10 minutes, and then a laminate having a PVA-based resin layer on the substrate was prepared. Then, the laminate was first freely aired at 130 ° C in air. The end extension is 1.8 times (air-assisted extension) to form an extended laminate. Then the PVA layer is subjected to an insoluble step, that is, the extended laminate is immersed in a boric acid insoluble aqueous solution at a liquid temperature of 30 ° C for 30 seconds to extend the laminate. The PVA molecule contained in the step is aligned. The boric acid insoluble aqueous solution in this step is such that the boric acid content is 3 parts by weight based on 100 parts by weight of water, and the extended laminate is dyed to form a colored laminate. The colored laminate system is used to form the final formed structure. The monomer of the PVA layer of the polarizer is transparent When the ratio is 40 to 44%, the extended laminate is immersed in a dyeing solution containing iodine and potassium iodide at a liquid temperature of 30 ° C for any time, whereby the PVA layer contained in the extended laminate is dyed by iodine. In the step, the dyeing liquid is water, and the iodine concentration is in the range of 0.1 to 0.4% by weight, and the potassium iodide concentration is in the range of 0.7 to 2.8% by weight. The concentration ratio of iodine to potassium iodide is 1 to 7. Then, the PVA molecules of the PVA layer are subjected to a crosslinking treatment step, that is, the colored layered body is immersed in a boric acid cross-linked aqueous solution at 30 ° C for 60 seconds to adsorb iodine. The boric acid cross-linking aqueous solution in this step is such that the boric acid content is relative to 100 parts by weight of water is 3 parts by weight, and the potassium iodide content is 3 parts by weight relative to 100 parts by weight of water of water. Then, the obtained colored layered body is subjected to an elongation temperature of 70 ° C in an aqueous solution of boric acid, and in the previous air. The extension extends in the same direction by 3.05 times (boric acid water extension), and an optical film laminate having a final stretching ratio of 5.50 times is obtained. The optical film laminate is taken out from the aqueous boric acid solution, and the potassium iodide content is relative to water 100. The boric acid adhering to the surface of the PVA layer was washed with an aqueous solution of 4 parts by weight, and the optical film laminate after washing was dried by a drying step of warm air at 60 ° C. The polarized film contained in the optical film laminate was obtained. The thickness of the piece A was 5 μm.

[Production Example 2] Production of polarizer B A polyvinyl alcohol film having a thickness of 60 μm was stretched three times while being dyed in a iodine solution having a speed ratio of 30 ° C and a concentration of 0.3% for 1 minute. Thereafter, the mixture was immersed in an aqueous solution containing boric acid having a concentration of 4% and potassium iodide at a concentration of 10% at 60 ° C for 0.5 minutes while being stretched so that the total stretching ratio was 6 times. Subsequently, it was immersed in an aqueous solution containing potassium iodide at a concentration of 1.5% at 30 ° C for 10 seconds, and after washing, it was dried at 50 ° C for 4 minutes to obtain a polarizer B having a thickness of 22 μm.

[Production Example 3] Production of (meth)acrylic adhesive A In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler, 200 parts by weight of 2-ethylhexyl acrylate was fed, and acrylic acid 2 was fed. 10 parts by weight of hydroxyethyl ester, 0.4 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 312 parts by weight of ethyl acetate, and nitrogen gas was introduced while slowly stirring, and the temperature of the flask was adjusted. The polymerization reaction was carried out for about 6 hours at around 65 ° C to prepare a (meth)acrylic polymer solution (A1) having a weight average molecular weight of 500,000. In the obtained (meth)acrylic polymer solution (A1) (100 parts by weight of the solid component), a trimeric isocyanate of hexamethylene diisocyanate as a crosslinking agent (Nippon Polyurethane Industry Co., Ltd.) was added. Manufactured, trade name: Coronate HX) 0.6 parts by weight of dibutyltin dilaurate (1% by weight ethyl acetate solution) as a crosslinking catalyst, 0.6 parts by weight, as a decane coupling agent (Shin-Etsu Chemical Co., Ltd.) The product name: KBM403) was 0.1 part by weight, and was kept at around 25 ° C, and the mixture was stirred for about 1 minute to prepare a (meth)acrylic adhesive A.

[Production Example 4] Production of (meth)acrylic adhesive B In the (meth)acrylic polymer solution (A1) (100 parts by weight of solid component) obtained in Production Example 3, it was blended as a crosslinking agent. 1.0 part by weight of a trimer isocyanate of hexamethylene diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Coronate HX), dibutyltin dilaurate (1% by weight of acetic acid B as a crosslinking catalyst) The (meth)acrylic adhesive B was prepared in an amount of 0.1 part by weight as a decane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM403).

[Production Example 5] Production of urethane-based adhesive C As the polyol (A), a triol (manufactured by Asahi Glass Co., Ltd., trade name: PREMINOL S3011, Mn = 10000) was used: 85 parts by weight, triol (Sanyo Chemical Co., Ltd., trade name: SANNIX GP-3000, Mn=3000): 13 parts by weight, triol (manufactured by Sanyo Chemical Co., Ltd., trade name: SANNIX GP-1000, Mn=1000): 2 In a part by weight, and a polyfunctional alicyclic isocyanate compound (Nippon Polyurethane Industry Co., Ltd., trade name: Coronate HX) as a polyfunctional isocyanate compound (B): 18 parts by weight, a catalyst (Japanese chemical industry) Co., Ltd., trade name: acetonitrile iron (III): 0.04 parts by weight, Irganox 1010 (manufactured by BASF) as a deterioration preventing agent: 0.50 parts by weight, fatty acid ester (isopropyl myristate, Kao, Product name: EXCEPARL IPM, Mn = 270): 30 parts by weight, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) quinone imine (manufactured by First Industrial Pharmaceutical Co., Ltd., trade name: AS110) : 1.5 parts by weight, two-end polyether modified polysiloxane oil (Shin-Etsu Chemical Industry Co., Ltd. Limiting Corporation, KF-6004): 0.01 parts by weight of ethyl acetate as a diluting solvent: 241 parts by weight, and stirred with a disper, prepared amine urethane-based adhesive C.

[Production Example 6] Production of (meth)acrylic adhesive D In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler, 99 parts by weight of butyl acrylate and 4-hydroxybutyl acrylate 1 were produced. 0.1 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 100 parts by weight of ethyl acetate were fed together, and nitrogen gas was introduced while slowly stirring, and then the inside of the flask was placed. The liquid temperature was maintained at around 55 ° C, and polymerization was carried out for 8 hours to prepare a (meth)acrylic polymer solution (A2) having a weight average molecular weight of 1.6 million. The obtained (meth)acrylic polymer solution (A2) (solid component: 100 parts by weight) was blended with an isocyanate crosslinking agent (MITSUI TAKEDA CHEMICALS, INC., trade name: Takenate D110N, trimethylolpropane extension) (meth)acrylic adhesive D was prepared by dispersing 0.1 parts by weight of a polyether compound (trade name: Excestar 2420, manufactured by Asahi Glass Co., Ltd.) in an amount of 0.1 part by weight.

[Production Example 7] Production of (meth)acrylic adhesive E The (meth)acrylic polymer solution (A2) prepared in Production Example 6 (100 parts by weight of solid content) was blended with an isocyanate crosslinking agent (MITSUI). TAKEDA CHEMICALS, INC., trade name: Takenate D110N, trimethylolpropane decyl diisocyanate) 0.3 parts by weight, decane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM403) 0.1 parts by weight A (meth)acrylic adhesive E.

[Production Example 8] Production of a (meth)acrylic-based pressure-sensitive adhesive F in 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, 3 parts by weight of acrylic acid, and acrylic acid 2 1 part by weight of hydroxyethyl ester, 0.1 part by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 100 parts by weight of ethyl acetate were fed together, and nitrogen gas was introduced while slowly stirring. The liquid temperature in the flask was maintained at around 55 ° C, and polymerization was carried out for 8 hours to prepare a (meth)acrylic polymer solution (A3) having a weight average molecular weight of 1.8 million. The obtained (meth)acrylic polymer solution (A3) (solid component: 100 parts by weight) was blended with an isocyanate crosslinking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Coronate L, trishydroxyl 0.5 parts by weight of an adduct of a toluene diisocyanate of propane) and 0.1 part by weight of a decane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM403) to prepare a (meth)acrylic adhesive F .

[Example 1] A glass film (manufactured by Nippon Electric Glass Co., Ltd., trade name: OA10, size: 400 mm × 40 mm, thickness: 100 μm) and a protective film (acrylic resin having a thickness of 40 μm) were sequentially attached through an adhesive. The film) and the polarizer A are used to produce a laminate a. The (meth)acrylic adhesive A was coated on the polyfluorene-treated surface of the poly(ethylene terephthalate) film of one side, and heated at 110 ° C for 3 minutes to form Adhesive layer A having a thickness of 25 μm. The adhesive layer A was transferred to the side of the polarizer A of the layered body a to obtain an optical layered product A.

[Example 2] (Production of optical laminate) A glass film (manufactured by Nippon Electric Glass Co., Ltd., trade name: OA10, size: 400 mm × 40 mm, thickness: 100 μm) and polarizer A were bonded through an adhesive. And the laminated body b is produced. The (meth)acrylic adhesive A was coated on the polyfluorene-treated surface of the poly(ethylene terephthalate) film of one side, and heated at 110 ° C for 3 minutes to form Adhesive layer A having a thickness of 25 μm. The adhesive layer A is transferred onto the side of the polarizer A of the above-mentioned laminated body b to obtain an optical layered body B.

[Example 3] A glass film (manufactured by Nippon Electric Glass Co., Ltd., trade name: OA10, size: 400 mm × 40 mm, thickness: 100 μm) and a protective film (thickness: 40 μm of acrylic resin) were sequentially attached through an adhesive. A resin film), a polarizer B, and a protective film (thickness: 40 μm acrylic resin film) were used to obtain a laminate c. The (meth)acrylic adhesive A was coated on the polyfluorene-treated surface of the poly(ethylene terephthalate) film of one side, and heated at 110 ° C for 3 minutes to form Adhesive layer A having a thickness of 25 μm. The adhesive layer A is transferred onto the side of the polarizer B of the above-mentioned laminated body c to obtain an optical layered body C.

[Example 4] A layered body a was obtained in the same manner as in Example 1. The (meth)acrylic adhesive B was coated on the polyfluorene-treated surface of the polyfluorene-treated polyethylene terephthalate film, and heated at 110 ° C for 3 minutes to form a thickness. 12 μm of adhesive layer B. The adhesive layer B is transferred onto the side of the polarizer A of the above-mentioned laminated body a to obtain an optical layered body D.

[Example 5] A layered body a was obtained in the same manner as in Example 1. The urethane-based adhesive C was coated on the polyfluorene-treated surface of the poly(ethylene terephthalate)-treated polyethylene terephthalate film, and heated at 110 ° C for 3 minutes to form Adhesive layer C having a thickness of 25 μm. This adhesive layer C was transferred onto the side of the polarizer A of the above-mentioned laminated body a to obtain an optical layered body E.

[Example 6] A layered body a was obtained in the same manner as in Example 1. The (meth)acrylic adhesive D was coated on the polyfluorene-treated surface of the polyfluorene-treated polyethylene terephthalate film, and heated at 110 ° C for 3 minutes to form a thickness. 25 μm adhesive layer D. The adhesive layer D is transferred onto the side of the polarizer A of the above-mentioned laminated body a to obtain an optical layered body F.

[Example 7] A layered body a was obtained in the same manner as in Example 1. The (meth)acrylic adhesive E was coated on the polyfluorene-treated surface of the polyfluorene-treated polyethylene terephthalate film, and heated at 110 ° C for 3 minutes to form a thickness. 50 μm adhesive layer E. The adhesive layer E is transferred onto the side of the polarizer A of the above-mentioned laminated body a to obtain an optical layered body G.

[Comparative Example 1] A layered body a was obtained in the same manner as in Example 1. The above (meth)acrylic adhesive F was coated on the polyfluorene-treated surface of the polyfluorene-treated polyethylene terephthalate film, and heated at 110 ° C for 3 minutes to form a thickness. 25 μm adhesive layer F. The adhesive layer F is transferred onto the side of the polarizer A of the above-mentioned laminated body a to obtain an optical layered body H.

[Comparative Example 2] An optical layered product I was obtained in the same manner as in Example 1 except that the glass film was changed to a polyethylene terephthalate film having a thickness of 100 μm.

<Evaluation> The optical laminates obtained in the examples and the comparative examples were subjected to the following evaluation. The results are shown in Table 1.

1. Then, the optical laminate was cut into 150 mm × 25 mm, and attached to an alkali-free glass plate (manufactured by Corning Co., Ltd., trade name: EG-XG) having a thickness of 0.7 mm by a laminator, followed by 50 ° C and 5 atm. The sample for evaluation was prepared by performing autoclave treatment for 15 minutes to completely adhere it. For the above-mentioned evaluation sample, the optical laminate was peeled off from the glass plate by a tensile tester (Autograph SHIMAZU AG-1 10KN) under the conditions of 23 ° C / humidity 55%, peeling angle 90 °, and peeling speed 300 mm / min. And measuring the adhesion of the optical laminate. The measurement was performed at intervals of 1 time/0.5 s, and the average enthalpy was used as the measurement enthalpy.

2. Reworkability The optical laminate was attached to an alkali-free glass (manufactured by Corning Co., Ltd., trade name: EG-XG) having a size of 15 吋 (diagonal) and a thickness of 0.7 mm by a bonding machine. Next, the autoclave treatment was carried out at 50 ° C and 0.5 MPa for 15 minutes, and the optical laminate was completely adhered to the alkali-free glass to prepare a sample for evaluation. With respect to the above-mentioned sample for evaluation, the optical laminate was peeled off from the glass at a corner to the diagonal direction of the optical laminate, and cracks and breaks of the glass film were evaluated. ◎: The optical laminate is completely free of cracks and can be easily reworked. ○: Although there are few cracks in the optical laminate, it can be easily reworked. There is no problem in practical use. △: The optical laminate has cracks, but it can be reworked without breaking. There is no problem in practical use. ×: Optical laminate is broken and cannot be reworked

3. Durability test An optical laminate was attached to an alkali-free glass (manufactured by Corning Co., Ltd., EG-XG) having a size of 15 吋 (diagonal) and a thickness of 0.7 mm by a laminator. Next, the autoclave treatment was carried out at 50 ° C and 0.5 MPa for 15 minutes, and the optical laminate was completely adhered to the alkali-free glass to prepare a sample for evaluation. The sample for evaluation was subjected to a treatment in a gas atmosphere of 80 ° C for 500 hours (heating test), and the appearance was visually evaluated according to the following criteria. Further, the sample for evaluation was subjected to a treatment in a gas atmosphere of 60 ° C / 90% RH for 500 hours (humidification test), and the appearance was visually evaluated according to the following criteria. ◎: There is no change in appearance such as foaming, peeling, and the like. ○: Although there is little and there is a little peeling or foaming at the ends, there is no problem in practical use. △: There is peeling or foaming at the end, but there is no problem in practical use as long as it is not used for special purposes. ×: The end portion was significantly peeled off, and there was a problem in practical use.

[Table 1]

10‧‧‧ glass film

20‧‧‧ polarizer

30‧‧‧Adhesive layer

40‧‧‧Protective film

100‧‧‧Optical laminate

Fig. 1 is a schematic cross-sectional view showing an optical layered body according to an embodiment of the present invention.

Claims (7)

An optical laminate comprising, in order, a glass film, a polarizing member and an adhesive layer, and the optical laminate has an adhesion force to the glass plate of 5 N/25 mm or less. The optical laminate of claim 1, wherein the thickness of the adhesive layer is 5 μm to 100 μm. The optical laminate according to claim 1, wherein the thickness of the glass film is from 20 μm to 200 μm. The optical laminate of claim 1, wherein the adhesive layer comprises a (meth)acrylic adhesive. The optical layered body of claim 1, wherein the adhesive layer comprises an urethane-based adhesive. An image display device comprising the optical layered body of claim 1. The image display device according to claim 6 is provided with the optical layered body on the outermost side of the viewing side.