TWI708682B - Manufacturing method of laminated optical film - Google Patents

Abstract

In the method of manufacturing the laminated optical film of the present invention, the laminated optical film is formed by curing an active energy ray-curable adhesive composition through an adhesive layer formed with at least a first optical film and a second optical film laminated; and , The active energy ray curable adhesive composition used contains at least two different active energy ray curable adhesive compositions, including a first active energy ray curable adhesive composition and a second active energy ray curable adhesive composition Composition. In addition, a coating step is performed to apply the first active energy ray-curing adhesive composition to the bonding surface of the first optical film, and to apply the second active energy ray-curing adhesive composition to the bonding surface of the second optical film Adhesive composition.

Description

Manufacturing method of laminated optical film

The present invention relates to a method for manufacturing a laminated optical film, the laminated optical film is formed by curing an active energy ray curable adhesive composition through an adhesive layer formed with at least a first optical film and a second optical film laminated. The laminated optical film can form image display devices such as liquid crystal display devices (LCD), organic EL display devices, CRTs, and PDPs.

Background technique

In clocks, mobile phones, PDAs, notebook computers, personal computer screens, DVD players, TVs, etc., LCD devices are rapidly expanding on the market. The liquid crystal display device visualizes the polarization state through the conversion of liquid crystals. From the perspective of its display principle, a polarizing element can be used. In particular, in TV and other applications, high brightness, high contrast, and wide viewing angle are increasingly required. Polarizing films are also increasingly requiring high transmittance, high polarization, and high color reproducibility.

Polarizers have high transmittance and high degree of polarization. For example, iodine-based polarizers with a stretched structure in which iodine is adsorbed on polyvinyl alcohol (hereinafter also referred to as "PVA") are the most widely used. Generally, a polarizing film uses a so-called water-based adhesive in which a polyvinyl alcohol-based material is dissolved in water, and a transparent protective film is bonded to both sides of a polarizer (Patent Document 1 and Patent Document 2 below). For the transparent protective film, cellulose triacetate with high moisture permeability can be used. When using the aforementioned water-based adhesive (ie, wet build-up layer), a drying step is required after bonding the polarizer and the transparent protective film.

On the other hand, an active energy ray-curable adhesive has been proposed to replace the aforementioned water-based adhesive. When using an active energy ray hardening adhesive to manufacture a polarizing film, since no drying step is required, the productivity of the polarizing film can be improved. For example, the present inventors have proposed a radical polymerization type active energy ray curable adhesive using an N-substituted amine-based monomer as a curable component (Patent Document 3 and Patent Document 4 below).

Prior art literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2006-220732

Patent Document 2: Japanese Patent Laid-Open No. 2001-296427

Patent Document 3: Japanese Patent Laid-Open No. 2012-052000

Patent Document 4: Japanese Patent Laid-Open No. 2012-068593

Summary of the invention

The adhesive layer formed using the active energy ray-curable adhesive described in Patent Documents 3 and 4 is sufficient to pass, for example, a water resistance test that evaluates whether or not it fades or peels after being immersed in 60°C warm water for 6 hours. However, in recent years, the water resistance of adhesives for laminated optical films has been required to be improved to a level that can pass more severe water resistance tests, such as evaluating the presence or absence of peeling when peeling off the ends after immersion (saturation). Therefore, including the active energy ray curable adhesives described in Patent Documents 3 and 4, the adhesives for laminated optical films that have been reported so far actually still have room for further improvement in terms of water resistance.

However, in recent years, there have also been many requirements for antinomy properties for organic polymer materials, but the actual situation is that it is not easy for a single organic polymer material to meet the required properties. In order to meet the requirements of the contradictory characteristics, many fields have proposed the technology of adding heterogeneous materials with different properties to organic polymer materials to make them composite. In terms of the next technology, for example, when two different types of objects are bonded, in order to improve the adhesion between the objects, it is considered that the adhesive layer is formed into a two-layer structure. However, when the adhesive layer is formed into a two-layer structure, stress may be concentrated on the interface and the adhesive force of the adhesive layer may decrease. In particular, in recent years, it has been difficult to establish a technology for forming the adhesive layer into a two-layer structure for adhesives used in laminated optical films that are required to be thinner. As far as the inventors know, there are no such reports.

As mentioned above, especially in the field of adhesives for laminated optical films that require thinner thickness, it is actually difficult to develop a technology that improves adhesion and water resistance when attaching two different optical films.

The present invention was developed to solve the aforementioned problems, and aims to provide a method for manufacturing a laminated optical film with an adhesive layer that exhibits high adhesion and excellent water resistance when two different optical films are laminated.

When the laminated optical films are different, they also show different characteristics from the viewpoint of hydrophilicity. Therefore, the method of forming the adhesive layer of the laminated optical films into a two-layer structure will improve the adhesion between the optical films. It is advantageous from the viewpoint of, but as mentioned above, the adhesive force may decrease due to the peeling of the interface in the adhesive layer.

On the other hand, the inventors found that even when two or more different active energy ray-curable adhesive compositions are used, the present inventors have found that interfacial peeling in the adhesive layer is not easy to occur by the following manufacturing method; After the two optical films are bonded to the energy-ray-curable adhesive composition, active energy rays are irradiated to bond the first optical film and the second optical film, wherein the active-energy-ray-curable adhesive composition contains at least two different types The active energy ray curable adhesive composition includes a first active energy ray curable adhesive composition and a second active energy ray curable adhesive composition. The present invention was completed based on this discovery, and has the following structure.

That is, the present invention relates to a method of manufacturing a laminated optical film, the laminated optical film is through an adhesive layer formed by curing an active energy ray curable adhesive composition, and at least a first optical film and a second optical film are laminated. For thin films, the aforementioned active energy ray-curable adhesive composition contains at least two different active energy ray-curable adhesive compositions, including a first active energy ray-curable adhesive composition and a second active energy ray-curable adhesive composition The manufacturing method of the laminated optical film includes the following steps: a coating step, applying the first active energy ray-curable adhesive composition to the bonding surface of the first optical film, and applying the second optical film The bonding surface of the film is coated with the second active energy ray-curable adhesive composition; the bonding step is to bond the first optical film and the second optical film; and the next step is to make the second optical film through the adhesive layer 1 Optical film and the second optical film Next, the adhesive layer is irradiated with active energy rays from the first optical film surface side or the second optical film surface side to harden the active energy ray-curable adhesive composition form.

According to the manufacturing method of the aforementioned laminated optical film, the first active energy ray curable adhesive composition applied on the bonding surface of the first optical film and the bonding surface of the second optical film are applied The second active energy ray-curable adhesive composition is bonded in a fluid state. As a result, even if the first active energy ray-curable adhesive composition and the second active energy ray-curable adhesive composition have different compositions, the two layers will still undergo a certain degree of compatibility, so the adhesive layer will not be formed. Layer structure, but to form a composition gradient structure. Therefore, it is difficult to cause interfacial peeling between the first active energy ray-curable adhesive composition and the second active energy ray-curable adhesive composition. Therefore, by appropriately selecting a first active energy ray curable adhesive composition having high affinity with the first optical film, and a second active energy ray curable adhesive composition having high affinity with the second optical film It is possible to produce a laminated optical film that can prevent interlayer peeling in the adhesive layer and has good adhesion between the first optical film and the second optical film.

In addition, the method for manufacturing the laminated optical film of the present invention is a laminated optical film in which at least a first optical film and a second optical film are laminated through an adhesive layer formed by curing an active energy ray-curable adhesive composition In the manufacturing method, the active energy ray hardening adhesive composition contains at least two different active energy ray hardening adhesive compositions, including a first active energy ray hardening adhesive composition and a second active energy ray hardening adhesive composition The manufacturing method of the laminated optical film of the present invention includes the following steps: a coating step, applying the first active energy ray-curable adhesive composition on the bonding surface of the first optical film, and coating The coating surface of the first active energy ray-curable adhesive composition is applied, and the second active energy ray-curable adhesive composition is further top-coated; the laminating step is self-coating on the first optical film The second optical film is bonded to the coating surface side of the second active energy ray-curable adhesive composition; and the next step is to bond the first optical film and the second optical film through the adhesive layer, and the adhesive The layer is formed by irradiating active energy rays from the first optical film surface side or the second optical film surface side to cure the active energy ray curable adhesive composition.

According to the manufacturing method of the aforementioned laminated optical film, the first active energy ray-curable adhesive composition which has been applied to the bonding surface of the first optical film is top-coated and the second active energy ray-curable adhesive composition is applied. Things. In addition, the first active energy ray-curable adhesive composition applied on the bonding surface of the first optical film and the application of the first active energy ray-curable adhesive composition applied to The second active energy ray-curable adhesive composition on the surface is in contact with each other in a fluid state. Thereby, even if the first active energy ray hardening adhesive composition and the second active energy ray hardening adhesive composition have different compositions, they can still be dissolved to a certain degree at the interface to form a composition gradient structure . Therefore, it is difficult to cause interfacial peeling between the first active energy ray-curable adhesive composition and the second active energy ray-curable adhesive composition. Therefore, by appropriately selecting a first active energy ray curable adhesive composition having high affinity with the first optical film, and a second active energy ray curable adhesive composition having high affinity with the second optical film It is possible to produce a laminated optical film that can prevent interlayer peeling in the adhesive layer and has good adhesion between the first optical film and the second optical film.

In the manufacturing method of the laminated optical film, the liquid viscosity of the first active energy ray-curable adhesive composition is preferably higher than the liquid viscosity of the second active energy ray-curable adhesive composition. When the first active energy ray curable adhesive composition that has been applied to the bonding surface of the first optical film is coated with the second active energy ray curable adhesive composition, the first active energy ray curable adhesive composition If the liquid viscosity of the composition is higher than the liquid viscosity of the second active energy ray-curable adhesive composition, the second active energy ray-curable adhesive composition can be reliably coated on the first active energy ray-curable adhesive composition剂组合物。 Agent composition.

In the manufacturing method of the laminated optical film, the contact angle of the active energy ray curable adhesive composition to the first optical film and the second optical film is preferably 5-50 degrees. With this structure, the active energy ray-curable adhesive composition has excellent wettability to the first optical film and the second optical film, so that the layer adhesion of the finally obtained laminated optical film can be sufficiently ensured.

In the manufacturing method of the laminated optical film, the first optical film and the second optical film are preferably selected from polyvinyl alcohol-based polarizers, acrylic resin films, cycloolefin resin films, polyester resin films, and polyolefin resins. At least one optical film in the group consisting of films, and the first optical film and the second optical film are preferably selected from the acrylic resin film, the cycloolefin resin film, the polyester resin film, and the foregoing One type of optical film in the group consisting of polyolefin resin film. When the laminated optical film is described above, it is possible to produce a laminated optical film provided with an adhesive layer that exhibits high adhesiveness when laminated and is excellent in water resistance.

唑啉基樹脂所構成群組中之至少1種樹脂時，積層光學薄膜之接著性更加提高，故為佳。 In the manufacturing method of the foregoing laminated optical film, the acrylic resin film, the cycloolefin resin film, the polyester resin film, and the polyolefin resin film have an easy-adhesive layer formed on the bonding surface thereof, and the easy-adhesive layer contains Selected from acrylic resin, polyurethane resin, polyvinyl alcohol resin, melamine resin and containing

When at least one type of resin in the oxazoline-based resin group is formed, the adhesiveness of the laminated optical film is improved, which is preferable.

In the manufacturing method of the laminated optical film, the first optical film and the second optical film are selected from the group consisting of the acrylic resin film, the cycloolefin resin film, the polyester resin film, and the polyolefin resin film In the case of at least one optical film in the group, and the aforementioned active energy ray-curable adhesive composition contains 25 to 98% by weight of radical polymerization with an SP value of 18 to 21 (MJ/m ³ ) ^1/2 In the case of sex compounds, the following effects will be exhibited. Specifically, when the aforementioned specific optical film is used, and the active energy ray-curable adhesive composition contains a predetermined amount of a radically polymerizable compound showing a predetermined SP value, the gap between the adhesive layer and the optical film Form a compatible layer. As a result, the adhesiveness of the laminated optical film will be improved, which is preferable.

In the manufacturing method of the aforementioned laminated optical film, one of the aforementioned first optical film and the aforementioned second optical film is preferably the aforementioned polyvinyl alcohol-based polarizer, and is applied to the bonding surface of the aforementioned polyvinyl alcohol-based polarizer The aforementioned active energy ray-curable adhesive composition preferably contains a hydroxyl group-containing radical polymerizable compound. With this structure, the adhesion between the polyvinyl alcohol-based polarizer and the adhesive layer will be improved, which is preferable.

1‧‧‧Polarizer

2‧‧‧Transparent protective film

3‧‧‧Adhesive layer

Figure 1 (I) ~ (V) are schematic diagrams showing the method of evaluating the composition gradient structure in the adhesive layer using TOF-SIMS.

Detailed description of the preferred embodiment

The laminated optical film of the present invention is through an adhesive layer formed by curing an active energy ray curable adhesive composition, and at least the first optical film and the second optical film are laminated, and the adhesive layer is cured by the active energy ray The adhesive composition is formed by the cured layer obtained after the active energy rays are irradiated.

Active energy ray-curable adhesive compositions can be roughly classified into electron beam curing type, ultraviolet curing type, visible light curing type, and the like. In addition, ultraviolet curing type and visible light curing type adhesives can be divided into radical polymerization curing type adhesives and cationic polymerization type adhesives. In the present invention, the active energy lines with a wavelength range of less than 10nm~380nm are recorded as ultraviolet rays, and the active energy lines with a wavelength range of 380nm~800nm are recorded as visible rays.

Examples of the compound constituting the radical polymerization hardening type adhesive include a radical polymerizable compound. Examples of the radically polymerizable compound include compounds having a radically polymerizable functional group of carbon-carbon double bonds such as (meth)acryloyl and vinyl groups. As the curable component, either a monofunctional radical polymerizable compound or a bifunctional or more polyfunctional radical polymerizable compound can be used. Moreover, these radically polymerizable compounds can be used individually by 1 type or in combination of 2 or more types. The radically polymerizable compound is preferably a compound having a (meth)acryloyl group. The main component of the active energy ray hardening adhesive composition used in the present invention is preferably a compound having a (meth)acryloyl group. Specifically, the total amount of the active energy ray hardening adhesive composition is At 100% by weight, it is preferable to contain the compound having a (meth)acryloyl group at 50% by weight or more, and more preferably to contain 80% by weight or more. Furthermore, in the present invention, the (meth)acryloyl group means an acryloyl group and/or a methacryloyl group, and the following "(meth)" means the same.

<Monofunctional radical polymerizable compound>

啉、N-丙烯醯基哌啶、N-甲基丙烯醯哌啶、N-丙烯醯基吡咯啶等。 Examples of the monofunctional radical polymerizable compound include (meth)acrylamide derivatives having a (meth)acrylamide group. The (meth)acrylamide derivative is preferred because it can ensure adhesion to polarizers or various transparent protective films, and has a fast polymerization speed and excellent productivity. Specific examples of (meth)acrylamide derivatives include: N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl N-alkyl (meth)acrylamide, N-isopropyl (meth)acrylamide, N-butyl(meth)acrylamide, N-hexyl(meth)acrylamide, etc. The (meth)acrylamide derivatives; N-hydroxymethyl (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-hydroxymethyl-N-propane (methyl) N-hydroxyalkyl-containing (meth)acrylamide derivatives such as acrylamide; aminomethyl (meth)acrylamide, aminoethyl (meth)acrylamide, etc., containing N-aminoalkyl (Meth)acrylamide derivatives; N-methoxymethacrylamide, N-ethoxymethacrylamide and other N-alkoxy-containing (meth)acrylamide derivatives; mercapto N-mercaptoalkyl-containing (meth)acrylamide derivatives such as methyl (meth)acrylamide, mercaptoethyl (meth)acrylamide, etc. In addition, the nitrogen atom of the (meth)acrylamide group forms a heterocyclic ring-containing (meth)acrylamide derivative, for example: N-acrylamide

Pyroline, N-acryloyl piperidine, N-methacryloyl piperidine, N-acryloyl pyrrolidine, etc.

Among the aforementioned (meth)acrylamide derivatives, from the standpoint of adhesion to polarizers or various transparent protective films, N-hydroxyalkyl-containing (meth)acrylamide derivatives are preferred. Examples of the monofunctional radical polymerizable compound include various (meth)acrylic acid derivatives having (meth)acryloxy groups. Specifically, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, 2-methyl -2-Nitropropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, second butyl (meth)acrylate, tertiary butyl (meth)acrylate Base) acrylate, n-pentyl (meth) acrylate, tertiary pentyl (meth) acrylate, 3-pentyl (meth) acrylate, 2,2-dimethylbutyl (meth) Acrylate, n-hexyl (meth) acrylate, acetyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 4-methyl-2- (Meth)acrylic acid (carbon number 1-20) alkyl esters such as propylpentyl (meth)acrylate and n-octadecyl (meth)acrylate.

基(甲基)丙烯酸酯、2-降

基甲基(甲基)丙 烯酸酯、5-降

烯-2-基-甲基(甲基)丙烯酸酯、3-甲基-2-降

基甲基(甲基)丙烯酸酯、二環戊烯基(甲基)丙烯酸酯、二環戊烯基氧基乙基(甲基)丙烯酸酯、二環戊烷基(甲基)丙烯酸酯、等多環式(甲基)丙烯酸酯；2-甲氧基乙基(甲基)丙烯酸酯、2-乙氧基乙基(甲基)丙烯酸酯、2-甲氧基甲氧基乙基(甲基)丙烯酸酯、3-甲氧基丁基(甲基)丙烯酸酯、乙基卡必醇(甲基)丙烯酸酯、苯氧基乙基(甲基)丙烯酸酯、烷基苯氧基聚乙二醇(甲基)丙烯酸酯等含烷氧基或苯氧基之(甲基)丙烯酸酯等。 In addition, examples of the aforementioned (meth)acrylic acid derivatives include cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate and cyclopentyl (meth)acrylate; benzyl (meth) Aralkyl (meth)acrylates such as acrylates; 2-iso

Base (meth)acrylate, 2-drop

Methyl (meth)acrylate, 5-drop

En-2-yl-methyl (meth)acrylate, 3-methyl-2-nor

Methyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyl oxyethyl (meth) acrylate, dicyclopentyl (meth) acrylate, And other polycyclic (meth)acrylates; 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 2-methoxymethoxyethyl ( Meth) acrylate, 3-methoxybutyl (meth) acrylate, ethyl carbitol (meth) acrylate, phenoxyethyl (meth) acrylate, alkylphenoxy polyacrylate Ethylene glycol (meth)acrylate and other alkoxy- or phenoxy-containing (meth)acrylates.

In addition, the aforementioned (meth)acrylic acid derivatives include, for example, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate , 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10- Hydroxyalkyl (meth)acrylates such as hydroxydecyl (meth)acrylate and 12-hydroxydodecyl (meth)acrylate, or [4-(hydroxymethyl)cyclohexyl]methacrylate, Hydroxyl-containing (meth)acrylates such as cyclohexanedimethanol mono(meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, etc.; glycidyl (meth)acrylic acid Epoxy-containing (meth)acrylates such as 4-hydroxybutyl (meth)acrylate glycidyl ether; 2,2,2-trifluoroethyl (meth)acrylate, 2, 2,2-Trifluoroethylethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate, octafluoropentyl (meth)acrylate, Heptafluorodecyl (meth)acrylate, 3-chloro-2-hydroxypropyl (meth)acrylate and other halogen-containing (meth)acrylates; dimethylaminoethyl (meth)acrylate Alkylaminoalkyl (meth)acrylate; 3-oxetanyl methyl (meth)acrylate, 3-methyl-oxetanyl methyl (meth)acrylate , 3-Ethyl-oxetanyl methyl (meth)acrylate, 3-butyl-oxetanyl methyl (meth)acrylate, 3-hexyl-oxetane (Meth)acrylic acid esters containing oxygen and methyl groups such as methyl (meth)acrylate; methyl tetrahydrofuran (meth)acrylate, butyrolactone (meth)acrylate and other heterocyclic (meth) Acrylate, or hydroxytrimethylacetate neopentyl glycol (meth)acrylic acid adduct, p-phenylphenol (meth)acrylate, etc.

In addition, the monofunctional radical polymerizable compound includes, for example, (meth)acrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. , Isocrotonic acid and other carboxyl-containing monomers.

、乙烯吡嗪、乙烯吡咯、乙烯咪唑、乙烯

唑、乙烯

啉等具含氮雜環之乙烯系單體等。 In addition, the monofunctional radical polymerizable compound includes, for example, internal amine-based vinyl monomers such as N-vinylpyrrolidone, N-vinyl-ε-caprolactone, and methyl vinylpyrrolidone; ethylene Pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piper

, Vinyl pyrazine, vinyl pyrrole, vinyl imidazole, ethylene

Azole, ethylene

Vinyl monomers with nitrogen-containing heterocycles such as morpholines.

In addition, the monofunctional radical polymerizable compound can be a radical polymerizable compound with active methylene groups. The radically polymerizable compound with active methylene group is a compound with active methylene group having active double bond groups such as (meth)acrylic group at the end or in the molecule. The active methylene group may be exemplified by acetylacetoxy, alkoxypropanedioic, or cyanoacetoxy. The aforementioned active methylene group is preferably acetyl acetyl group. Specific examples of radically polymerizable compounds with active methylene groups include, for example: 2-acetylacetoxyethyl (meth)acrylate, 2-acetylacetoxypropyl (meth)acrylate , 2-Acetylacetoxy-1-methylethyl (meth)acrylate and other Acetylacetoxyalkyl (meth)acrylates; 2-Ethoxypropanedioxyloxyethyl ( Meth) acrylate, 2-cyanoacetoxyethyl (meth)acrylate, N-(2-cyanoacetoxyethyl)acrylamide, N-(2-propionylacetoxy) Butyl)acrylamide, N-(4-acetylacetoxymethylbenzyl)acrylamide, N-(2-acetylacetoxyaminoethyl)acrylamide, and the like. The radical polymerizable compound with active methylene group is preferably acetoxyalkyl (meth)acrylate.

<Multifunctional radical polymerizable compound>

烷醇二(甲基)丙烯酸酯、三羥甲基丙烷三(甲基)丙烯酸酯、新戊四醇三(甲基)丙烯酸酯、新戊四醇四(甲基)丙烯酸酯、二新戊四醇五(甲基)丙烯酸酯、二新戊四醇六(甲基)丙烯酸酯、EO改質二甘油四(甲基)丙烯酸酯等(甲基)丙烯酸與多元醇之酯化物、9,9-雙[4-(2-(甲基)丙烯醯基氧基乙氧基)苯基]茀。可舉具體例如：ARONIX M-220(東亞合成社製)、Light Acrylate 1,9ND-A(LogPow；3.68)(共榮社化學社製)、Light Acrylate DGE-4A(共榮社化學社製)、Light Acrylate DCP-A(共榮社化學社製)、SR-531(Sartomer社製)、CD-536(Sartomer社製)等。又，視需要，可舉各種環氧(甲基)丙烯酸酯、胺基甲酸酯(甲基)丙烯酸酯、聚酯(甲基)丙烯酸酯、或各種(甲基)丙烯酸酯系單體等為例。 In addition, the polyfunctional radical polymerizable compound having two or more functions includes, for example, tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6-hexanediol di( Meth) acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol diacrylate, 2-ethyl-2-butylpropanediol bis(methyl) ) Acrylate, bisphenol A di(meth)acrylate, bisphenol A ethylene oxide adduct di(meth)acrylate, bisphenol A propylene oxide adduct di(meth)acrylate, Bisphenol A diglycidyl ether di(meth)acrylate, neopentyl glycol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, cyclic trimethylolpropane Formal (meth)acrylate, two

Alkanol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, neopentylerythritol tri(meth)acrylate, neopentylerythritol tetra(meth)acrylate, dineopentyl Tetraol penta(meth)acrylate, dineopentaerythritol hexa(meth)acrylate, EO modified diglycerol tetra(meth)acrylate, etc. (meth)acrylic acid and polyol esters, 9, 9-Bis[4-(2-(meth)propenyloxyethoxy)phenyl]sulfonate. Specific examples include: ARONIX M-220 (manufactured by Toagosei Co., Ltd.), Light Acrylate 1,9ND-A (LogPow; 3.68) (manufactured by Kyoeisha Chemical Co., Ltd.), Light Acrylate DGE-4A (manufactured by Kyoeisha Chemical Co., Ltd.) , Light Acrylate DCP-A (manufactured by Kyoeisha Chemical Co., Ltd.), SR-531 (manufactured by Sartomer Co., Ltd.), CD-536 (manufactured by Sartomer Co., Ltd.), etc. In addition, if necessary, various epoxy (meth)acrylates, urethane (meth)acrylates, polyester (meth)acrylates, or various (meth)acrylate monomers can be mentioned Take for example.

In addition, in the present invention, the subsequent optical film is at least one optical film selected from the group consisting of acrylic resin film, cycloolefin resin film, polyester resin film, and polyolefin resin film, based on the total amount of the composition When it is 100% by weight, the active energy ray hardening adhesive composition contains 25 to 98% by weight of a radically polymerizable compound with an SP value of 18-21 (MJ/m ³ ) ^1/2 , preferably 30 to 90% by weight, more preferably 40 to 80% by weight, forms a compatible layer between the adhesive layer and the optical film. As a result, it is better because the adhesiveness of the laminated optical film is improved.

Here, the calculation method of the SP value (solubility parameter) of the present invention is explained below.

(Calculation method of solubility parameter (SP value))

In the present invention, the solubility parameter (SP value) of radically polymerizable compounds, polarizers, various transparent protective films, etc. can be calculated by FE D ORS [refer to "Polymer Engineering and Science (PO LY MER EN G.&SCI.)", Volume 14, No. 2 (1974), pages 148~154] That is, [Number 1]

(However, △EI is the energy of evaporation at 25°C belonging to the atom or radical, and △VI is the molar volume at 25°C).

The △EI and △VI in the aforementioned numbers show a constant value assigned to one atom and base in the main molecule. In addition, Table 1 below shows representative examples of the values of ΔE and ΔV assigned to atoms or groups.

烷醇二丙烯酸酯(SP值19.4(MJ/m³)^1/2)、EO改質二甘油四(甲基)丙烯酸酯(SP值20.9(MJ/m³)^1/2)等。另，SP值為18~21(MJ/m³)^1/2之自由基聚合性化合物，亦可較佳地使用市售品，可舉例如：ARONIX M-220(東亞合成社製，SP值19.0(MJ/m³)^1/2)、Light Acrylate 1,9ND-A(共榮社化學社製，SP值19.2(MJ/m³)^1/2)、Light Acrylate DGE-4A(共榮社化學社製，SP值20.9(MJ/m³)^1/2)、Light Acrylate DCP-A(共榮社化學社製，SP值20.3(MJ/m³)^1/2)、SR-531(SARTOMER社製，SP值19.1(MJ/m³)^1/2)、CD-536(SARTOMER社製，SP值19.4(MJ/m³)^1/2)等。 Specific examples of radically polymerizable compounds with an SP value of 18-21 (MJ/m ³ ) ^1/2 include, for example, tripropylene glycol diacrylate (SP value 19.0 (MJ/m ³ ) ^1/2 ), 1,9-nonanediol diacrylate (SP value 19.2 (MJ/m ³ ) ^1/2 ), tricyclodecane dimethanol diacrylate (SP value 20.3 (MJ/m ³ ) ^1/2 ), ring Trimethylolpropane n-acrylate (SP value 19.1 (MJ/m ³ ) ^1/2 ), two

Alkanol diacrylate (SP value 19.4 (MJ/m ³ ) ^1/2 ), EO modified diglycerol tetra(meth)acrylate (SP value 20.9 (MJ/m ³ ) ^1/2 ), etc. In addition, free radical polymerizable compounds with an SP value of 18-21 (MJ/m ³ ) ^1/2 can also be preferably used commercially available products, for example: ARONIX M-220 (manufactured by Toagosei Co., Ltd., SP value 19.0 (MJ/m ³ ) ^1/2 ), Light Acrylate 1,9ND-A (manufactured by Kyoeisha Chemical Co., Ltd., SP value 19.2 (MJ/m ³ ) ^1/2 ), Light Acrylate DGE-4A (Kyoeisha Chemical Company) Chemical company, SP value 20.9 (MJ/m ³ ) ^1/2 ), Light Acrylate DCP-A (Kyoeisha Chemical Co., SP value 20.3 (MJ/m ³ ) ^1/2 ), SR-531 (SARTOMER Company system, SP value 19.1 (MJ/m ³ ) ^1/2 ), CD-536 (Sartomer company system, SP value 19.4 (MJ/m ³ ) ^1/2 ), etc.

In the manufacturing method of the laminated optical film of the present invention, the active energy ray curable adhesive composition used is characterized by containing at least two different active energy ray curable adhesive compositions, including the first active energy ray curable adhesive composition An agent composition and a second active energy ray-curable adhesive composition. "Different active energy ray curable adhesive composition" means that the radically polymerizable compound contained and the composition ratio are different, so from the viewpoint of hydrophilic/hydrophobicity, the active energy ray curable adhesive composition has Different characteristics. The laminated optical film produced in the production method of the present invention is, for example, a polarizing film in which a transparent protective film is laminated on at least one side of a polarizer through an adhesive layer, the polarizer shows hydrophilicity and the transparent protective film shows hydrophobicity tendency. Therefore, in the present invention, when the first optical film is a polarizer and the second optical film is a transparent protective film, in order to improve adhesion, the first active energy ray curable adhesive composition arranged on the side of the first optical film is preferably It is hydrophilic and the second active energy ray hardening type adhesive composition is preferably hydrophobic.

In the present invention, the index for evaluating the hydrophilicity and hydrophobicity of the radical polymerizable compound contained in the active energy ray-curable adhesive composition can be logPow as an example. The octanol/water distribution coefficient (logPow) is an index indicating the lipophilicity of a substance, which means the logarithm of the octanol/water distribution coefficient. High logPow means lipophilicity, which means low water absorption. The logPow value can be obtained by measurement (the flask vibration method described in JIS-Z-7260), or it can be calculated by calculation. In this manual, the logPow value calculated by Chem Draw Ultra manufactured by Cambridge Soft is used.

In particular, in the present invention, when the first optical film is a polarizer and the second optical film is a transparent protective film, the first active energy ray curable adhesive composition arranged on the side of the first optical film contains logPow of -1 A component of ~1 is preferable, and it is preferable that the second active energy ray hardening adhesive composition contains component B with a logPow of 2-7. In this structure, (i) the first active energy ray curable adhesive composition is applied to the bonding surface of the first optical film, and the second active energy ray curable adhesive composition is applied to the bonding surface of the second optical film In the case of an adhesive composition, alternatively, apply the first active energy ray-curable adhesive composition to the bonding surface of (ii) the first optical film, and then apply the first active energy ray-curable adhesive composition When the second active energy ray-curable adhesive composition is applied to the coated surface, the adhesive layer between the polarizer and the transparent protective film has a hydrophilic A component concentration on the polarizer side. High composition gradient structure. Therefore, it is possible to manufacture a polarizing film that exhibits excellent adhesion between the polarizer and the transparent protective film and has an adhesive layer with excellent water resistance.

In addition, for example, in the adhesive layer of the polarizing film, the method of confirming the composition gradient structure with the concentration of the A component varying in the thickness direction can be exemplified by Time of Flight Secondary Ion Mass Spectrometry: Take the TOF-SIMS method confirmation as an example. The principle of TOF-SIMS is that when a sample is irradiated with a primary ion beam (for example, 1E12ions/cm ² or less) under ultra-high vacuum, only secondary ions are released from the top surface of the sample (about a few Å in depth). Import a time-of-flight (TOF) mass analyzer to obtain mass spectra. Using this principle, information on the element composition or chemical structure of the compound existing on the surface of the sample can be obtained. In addition, in the adhesive layer of the present invention, in order to confirm the composition gradient structure in the thickness direction of the adhesive layer between the transparent protective film and the polarizer, a cluster ion etching method can be used.

Hereinafter, the "cluster ion etching method" will be described. For example, using a general etching method using a monoatomic ion beam (Ar ⁺ , Cs ^+, etc.) as etching ions, when the surface of the adhesive layer is etched, the molecular structure of the surface of the adhesive layer will be destroyed and a damaged layer will be formed. At this time, even if you want to use TOF-SIMS to obtain the mass spectrum of the surface, the correct mass spectrum of the adhesive layer surface cannot be measured due to the influence of the damaged layer. On the other hand, when using the "cluster ion etching method" using "Ar gas cluster ions (Arn ⁺ )" as etching ions, the damage to the surface of the applied adhesive layer after etching is reduced, and the damaged layer cannot be formed, so etching The surface of the adhesive layer retains the molecular structure of the surface before etching. Therefore, by using TOF-SIMS, the mass spectrum of the adhesive layer surface can be accurately measured.

Figure 1 is a schematic diagram showing the method of evaluating the composition gradient structure in the thickness direction of the adhesive layer using TOF-SIMS. 1(I) shows an example of a polarizing film of a laminated optical film that can be manufactured in the present invention. In this polarizing film, a transparent protective film 2 is laminated on both sides of the polarizing member 1 through the adhesive layer 3. First, cut the transparent protective film 2 of the polarizing film shown in (I) horizontally with a microtome (the upper transparent protective film 2 in (I) of Fig. 1), and thin the transparent protective film in contact with the adhesive layer 3 2 thickness ((II)). Then, as shown in (III), use TOF-SIMS to measure the mass spectrum of the surface of the cut transparent protective film 2 and analyze the composition of the surface. Furthermore, as shown in (IV), after the surface of the thin transparent protective film 2 is etched by the "cluster ion etching method", the composition of the surface is analyzed by TOF-SIMS. Then, as shown in (V), the surface of the transparent protective film 2 is etched by the "cluster ion etching method", the adhesive layer 3 is deposited on the side surface of the transparent protective film 2, and the composition of the surface is analyzed by TOF-SIMS. After that, the etching process using the "cluster ion etching method" is repeated, and the composition of the deposited adhesive layer 3 surface is analyzed by TOF-SIMS, and the etching process is continuously carried out until it finally reaches the surface of the polarizer, and the adhesive layer 3 (even It is the analysis of the surface composition of the polarizer 1). By the method described above, the composition gradient structure in the thickness direction of the adhesive layer between the transparent protective film and the polarizer in the present invention can be confirmed.

logPow is the component A of -1 to 1, and among the radically polymerizable compounds described above, compounds with logPow of -1 to 1 can be used arbitrarily. Specifically, for example, hydroxyethyl acrylamide (trade name " HEAA", manufactured by Kojinsha, LogPow; -0.56), N-vinylformamide (trade name "BEAMSET 770", manufactured by Arakawa Chemical Co., LogPow; -0.25), acrylic morpholine (trade name "ACMO" , Kojinsha Co., LogPow; -0.20), γ-butyrolactone acrylate (trade name "GBLA", Osaka Organic Chemical Industry Co., Ltd., LogPow; 0.19), acrylic acid 2-weight body (trade name "β-CEA", DAICEL Corporation, LogPow; 0.2), N-vinylpyrrolidone (trade name "NVP", Nippon Catalysts Corporation, LogPow; 0.24), acetyl acetoxyethyl methacrylate (trade name "AAEM", Japan Synthetic Chemical Co., Ltd., LogPow; 0.27), 2-hydroxyethyl acrylate (trade name "HEA", Osaka Organic Chemical Industry Co., Ltd., LogPow; 0.28), epoxy propyl methacrylate (trade name "LIGHT ACRYLATE G", Kyoeisha Chemical Co., LogPow; 0.57), Dimethacrylamide (trade name "DMAA", Kojinsha Co., LogPow; 0.58), tetrahydrofuranol methyl acrylate multibody ester (trade name " VISCOAT#150D", manufactured by Osaka Organic Chemical Industry Co., Ltd., LogPow; 0.60), 4-hydroxybutyl acrylate (trade name "4-HBA", manufactured by Osaka Organic Chemical Industry Co., Ltd., LogPow; 0.68), acrylic acid (trade name "Acrylic ", manufactured by Mitsubishi Chemical Co., LogPow; 0.69), triethylene glycol diacrylate (trade name "Light Acrylate 3EG-A", manufactured by Kyoeisha Chemical Co., LogPow; 0.72), etc. Among them, the A component of the present invention with a logPow of -1 to 1, preferably uses (meth)acrylamide derivatives, and more preferably uses hydroxyethylacrylamide, acrylic morpholine, or dimethyl methacrylate. Alkylacrylamide is preferred. In addition to (meth)acrylamide derivatives, 4-hydroxybutyl acrylate is preferably used.

When the first optical film is a polarizer, it is preferable that the first active energy ray curable adhesive composition contains the A component with a logPow of -1 to 1. In addition, in order to improve the adhesive strength and water resistance of the adhesive layer, when the total amount of the first active energy ray-curable adhesive composition is 100% by weight, the logPow is the content of component A of -1 to 1, and the content is 5 to 95% by weight is preferable, and 30 to 80% by weight is more preferable.

基丙烯酸酯(商品名「Light Acrylate IB-XA」，共榮社化學社製，LogPow；3.27)、羥基三甲基乙酸新戊二醇丙烯酸加成物(商品名「Light Acrylate HPP-A」，共榮社化學社製，LogPow；3.35)、1,9-壬烷二醇二丙烯酸酯(商品名 「Light Acrylate 1,9ND-A」，共榮社化學社製，LogPow；3.68)、o-苯基酚EO改質丙烯酸酯(商品名「FANCRYL FA-301A」，日立化成社製，LogPow；3.98)、2-乙基己基氧呾(商品名「ARON OXETANE OXT-212」，東亞合成社製，LogPow；4.24)、雙酚-A-二環氧丙基醚(商品名「JER828」，三菱化學社製，LogPow；4.76)、雙酚A EO6莫耳改質二丙烯酸酯(商品名「FA-326A」，日立化成社製，LogPow；4.84)、雙酚A EO4莫耳改質二丙烯酸酯(商品名「FA-324A」，日立化成社製，LogPow；5.15)、雙酚A PO2莫耳改質二丙烯酸酯(商品名「FA-P320A」，日立化成社製，LogPow；6.10)、雙酚A PO3莫耳改質二丙烯酸酯(商品名「FA-P323A」，日立化成社製，LogPow；6.26)、雙酚A PO4莫耳改質二丙烯酸酯(商品名「FA-P324A」，日立化成社製，LogPow；6.43)等。該等中，本發明之logPow為2~7的B成分，以使用多官能(甲基)丙烯酸酯為佳，更以使用1,6-己烷二醇二丙烯酸酯)、二羥甲基-三環癸烷二丙烯酸酯、羥基三甲基乙酸新戊二醇丙烯酸加成物、1,9-壬烷二醇二丙烯酸酯、2-乙基己基氧呾、雙酚-A-二環氧丙基醚、雙酚A EO6莫耳改質二丙烯酸酯、雙酚A EO4莫耳改質二丙烯酸酯、雙酚A PO2莫耳改質二丙烯酸酯、雙酚A PO3莫耳改質二丙烯酸酯、或雙酚A PO4莫耳改質二丙烯酸酯。 In the present invention, when a component having a logPow of 2 to 7 is used as the B component, the B component shows high hydrophobicity. logPow is the B component of 2-7. Among the radically polymerizable compounds described above, compounds with logPow of 2-7 can be used arbitrarily. Specifically, for example, dicyclopentenyl acrylate (trade name "FANCRYL FA-511AS", manufactured by Hitachi Chemical Co., Ltd., LogPow; 2.26), butyl acrylate (trade name "Butyl Acrylate", manufactured by Mitsubishi Chemical Corporation, LogPow; 2.35), 1,6-hexanediol diacrylate (trade name "Light Acrylate 1.6HX-A", Kyoeisha Chemical Co., LogPow; 2.43), dicyclopentane acrylate (trade name "FANCRYL FA-513AS", Hitachi Chemical Co., LogPow; 2.58), dihydroxy Methyl-tricyclodecane diacrylate (trade name "Light Acrylate DCP-A", manufactured by Kyoeisha Chemical Co., LogPow; 3.05), different

Acrylate (trade name "Light Acrylate IB-XA", manufactured by Kyoeisha Chemical Co., LogPow; 3.27), hydroxytrimethylacetic acid neopentyl glycol acrylic adduct (trade name "Light Acrylate HPP-A", Kyoeisha Chemical Co., LogPow; 3.35), 1,9-nonanediol diacrylate (trade name "Light Acrylate 1,9ND-A", Kyoeisha Chemical Co., LogPow; 3.68), o- Phenylphenol EO modified acrylate (trade name "FANCRYL FA-301A", manufactured by Hitachi Chemical Co., LogPow; 3.98), 2-ethylhexyloxygen (trade name "ARON OXETANE OXT-212", manufactured by Toago Gosei Co., Ltd.) , LogPow; 4.24), bisphenol-A-diglycidyl ether (trade name "JER828", manufactured by Mitsubishi Chemical Corporation, LogPow; 4.76), bisphenol A EO6 mol modified diacrylate (trade name "FA -326A", manufactured by Hitachi Chemical Co., LogPow; 4.84), bisphenol A EO4 mol modified diacrylate (trade name "FA-324A", manufactured by Hitachi Chemical Co., LogPow; 5.15), bisphenol A PO2 mol Modified diacrylate (trade name "FA-P320A", manufactured by Hitachi Chemical Co., LogPow; 6.10), bisphenol A PO3 mol modified diacrylate (trade name "FA-P323A", manufactured by Hitachi Chemical Co., LogPow) ; 6.26), bisphenol A PO4 mol modified diacrylate (trade name "FA-P324A", manufactured by Hitachi Chemical Co., LogPow; 6.43), etc. Among them, the B component with logPow of 2-7 in the present invention is preferably multifunctional (meth)acrylate, and more preferably 1,6-hexanediol diacrylate), dimethylol- Tricyclodecane diacrylate, hydroxytrimethyl acetate neopentyl glycol acrylic adduct, 1,9-nonanediol diacrylate, 2-ethylhexyl oxygen, bisphenol-A-diepoxy Propyl ether, bisphenol A EO6 mol modified diacrylate, bisphenol A EO4 mol modified diacrylate, bisphenol A PO2 mol modified diacrylate, bisphenol A PO3 mol modified diacrylic acid Ester, or bisphenol A PO4 mole modified diacrylate.

When the second optical film is a transparent protective film, the second active energy ray curable adhesive composition preferably contains the B component with a logPow of 2-7. In addition, in order to improve the adhesive strength and water resistance of the adhesive layer, when the total amount of the second active energy ray hardening type adhesive composition is 100% by weight, the logPow is the content of the B component of 2-7, and the content is 30~ 95% by weight is preferable, and 50 to 80% by weight is more preferable.

When the active energy ray curable adhesive composition uses electron beams or the like as the active energy rays, the active energy ray curable adhesive composition does not necessarily contain a photopolymerization initiator, but when using ultraviolet rays or visible rays as the active energy rays In this case, it is better to contain a photopolymerization initiator.

<Photopolymerization initiator>

、2-氯9-氧硫

、2-甲基9-氧硫

、2,4-二甲基9-氧硫

、異丙基9-氧硫

、2,4-二氯9-氧硫

、2,4-二乙基9-氧硫

、2,4-二異丙基9-氧硫

、十二基9-氧硫

等9-氧硫

系化合物；樟腦醌；鹵化酮；醯基膦氧化物；醯基膦酸酯等。 The photopolymerization initiator when using a radically polymerizable compound can be appropriately selected depending on the active energy rays. When curing by ultraviolet or visible light, a photopolymerization initiator that splits by ultraviolet or visible light is used. The aforementioned photopolymerization initiator can be used alone, but when a plurality of photopolymerization initiators are mixed and used, the curing speed and curability can be adjusted, so it is preferred. The aforementioned photopolymerization initiator includes, for example, benzyl, diphenyl ketone, benzoyl benzoic acid, 3,3'-dimethyl-4-methoxybenzophenone and other diphenyl ketone series Compound; 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl)ketone, α-hydroxy-α,α'-dimethylacetophenone, 2-methyl-2-hydroxyl Ethyl phenyl ketone, 1-hydroxycyclohexyl phenone, 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propane-1-one, 2 -Hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propanyl)-benzyl]phenyl}-2-methyl-propan-1-one and other aromatic ketone compounds; Methoxyacetophenone, 2,2-Dimethoxy-2-phenylacetophenone, 2,2-diethoxyacetophenone, 2-methyl-1-[4-(methylthio )-Phenyl]-2-morpholinopropane-1 and other acetophenone compounds; benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin methyl ether, large Benzoin ether compounds such as anisole methyl ether; aromatic ketal compounds such as benzyl dimethyl ketal; aromatic sulfonyl chloride compounds such as 2-naphthalenesulfonyl chloride; 1-ketone-1 ,1-Propanedione-2-(o-ethoxycarbonyl)oxime and other photoactive oxime compounds; 9-oxysulfur

, 2-Chloro 9-oxysulfur

, 2-Methyl 9-oxysulfur

, 2,4-Dimethyl 9-oxysulfur

, Isopropyl 9-oxysulfur

, 2,4-Dichloro 9-oxysulfur

, 2,4-Diethyl 9-oxysulfur

, 2,4-Diisopropyl 9-oxysulfur

, Dodecyl 9-oxysulfur

9-oxysulfur

Series compounds; camphorquinone; halogenated ketones; phosphine oxides; phosphonates, etc.

The blending amount of the aforementioned photopolymerization initiator is 20% by weight or less when the total amount of the active energy ray-curable adhesive composition is 100% by weight. The blending amount of the photopolymerization initiator is preferably 0.01-20% by weight, preferably 0.05-10% by weight, and more preferably 0.1-5% by weight.

In addition, when the curable adhesive for laminated optical films of the present invention uses a visible light curable type containing a radical polymerizable compound as a curable component, a photopolymerization initiator with high sensitivity to light above 380 nm is used. Better. The photopolymerization initiator with high sensitivity to light above 380 nm will be described later.

For the aforementioned photopolymerization initiator, a compound represented by the following general formula (1) can be used alone;

特佳。接著劑中通式(1)所示之化合物的組成比率，於以活性能量線硬化型接著劑組成物之全量為100重量%時，以0.1~5重量%為佳，以0.5~4重量%較佳，以0.9~3重量%更佳。 (In the formula, R ¹ and R ² represent -H, -CH ₂ CH ₃ , -iPr or Cl, R ¹ and R ² may be the same or different), or use the compound represented by the general formula (1) in combination with the following A photopolymerization initiator with high sensitivity to light above 380nm is preferred. When the compound represented by the general formula (1) is used, the adhesion is better than when a photopolymerization initiator with high sensitivity to light above 380 nm is used alone. In the compound represented by the general formula (1), R ¹ and R ² are also -CH ₂ CH ₃ diethyl 9-oxysulfur

Especially good. The composition ratio of the compound represented by the general formula (1) in the adhesive, when the total amount of the active energy ray hardening adhesive composition is 100% by weight, is preferably 0.1 to 5% by weight, and 0.5 to 4% by weight Preferably, it is more preferably 0.9 to 3% by weight.

Moreover, it is preferable to add a polymerization initiation assistant as needed. The polymerization initiation aids include, for example, triethylamine, diethylamine, N-methyldiethanolamine, ethanolamine, 4-dimethylaminobenzoic acid, methyl 4-dimethylaminobenzoate, 4 -Ethyl dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, etc., ethyl 4-dimethylaminobenzoate is particularly preferred. When the polymerization initiation aid is used, the added amount is usually 0 to 5 parts by weight, preferably 0 to 4 parts by weight, and the best is 0 to 3 parts by weight compared to 100 parts by weight of the total amount of hardening ingredients.

啉基)苯基]-1-丁酮、2,4,6-三甲基苯 甲醯基-二苯基-膦氧化物、雙(2,4,6-三甲基苯甲醯基)-苯基膦氧化物、雙(η5-2,4-環戊二烯-1-基)-雙(2,6-二氟-3-(1H-吡咯-1-基)-苯基)鈦等。 Moreover, a well-known photopolymerization initiator can also be used together as needed. Since the transparent protective film with UV absorption does not transmit light below 380nm, it is better to use a photopolymerization initiator with high sensitivity to light above 380nm. Specifically, for example, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1 -(4-morpholinylphenyl)-butanone-1, 2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-

(Hydroxy)phenyl)-1-butanone, 2,4,6-trimethylbenzyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzyl) -Phenylphosphine oxide, bis(η5-2,4-cyclopentadien-1-yl)-bis(2,6-difluoro-3-(1H-pyrrol-1-yl)-phenyl)titanium Wait.

In particular, in addition to the photopolymerization initiator of the general formula (1), the photopolymerization initiator can also use the compound represented by the following general formula (2);

啉基)苯基]-1-丁酮(商品名：IRGACURE379製造商：BASF)之感度高，故為佳。 (In the formula, R ³ , R ⁴ and R ⁵ represent -H, -CH ₃ , -CH ₂ CH ₃ , -iPr or Cl, and R ³ , R ⁴ and R ⁵ may be the same or different). The compound represented by the general formula (2) can preferably use the commercially available 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropane-1-one (trade name: IRGACURE907 Manufacturer: BASF). Others, because 2-benzyl-2-dimethylamino-1-(4-morpholinylphenyl)-butanone-1 (trade name: IRGACURE369 manufacturer: BASF), 2-(dimethylamine基)-2-[(4-methylphenyl)methyl]-1-[4-(4-

Linyl)phenyl]-1-butanone (trade name: IRGACURE379 manufacturer: BASF) has high sensitivity, so it is preferred.

In the present invention, it is also preferable to use a hydroxyl-containing photopolymerization initiator among the aforementioned photopolymerization initiators. When the active energy ray curable adhesive composition contains a hydroxyl-containing photopolymerization initiator as the polymerization initiator, the solubility of the adhesive layer with a high concentration of component A on the polarizer side becomes higher, and the adhesive layer is cured Sexual rise. Examples of photopolymerization initiators with hydroxyl groups include 2-methyl-2-hydroxyethyl phenyl ketone (trade name "DAROCUR1173", manufactured by BASF), 1-hydroxycyclohexyl phenyl ketone (trade name " IRGACURE184", manufactured by BASF Corporation), 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propane-1-one (trade name "IRGACURE2959", BASF Corporation), 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propanyl)-benzyl]phenyl)-2-methyl-propane-1-one (commodity Name "IRGACURE127", manufactured by BASF Corporation) etc. In particular, the solubility of 1-hydroxycyclohexyl phenyl ketone to an adhesive layer with a high concentration of the A component is particularly excellent, and therefore preferable.

<Free radical polymerizable compound with active methylene and radical polymerization initiator with hydrogen extraction>

In the aforementioned active energy ray-curable adhesive composition, when the radical polymerizable compound is used with an active methylene radical polymerizable compound, it is better to use it in combination with a radical polymerization initiator with hydrogen extraction . With this structure, the adhesiveness of the adhesive layer with the polarizing film is significantly improved even after being taken out from a high humidity environment or water (non-dry state). The reason is not clear, but it is considered to be the following reason. That is, the radical polymerizable compound having a living methylene group polymerizes with other radical polymerizable compounds constituting the adhesive layer, and is drawn into the main chain and/or side chain of the matrix polymer in the adhesive layer to form an adhesive Agent layer. During the polymerization process, when there is a radical polymerization initiator with hydrogen extraction effect, it will form the matrix polymer constituting the adhesive layer and extract hydrogen from the radical polymerizable compound with active methylene group. Free radicals are generated from methylene. In addition, the radical-generated methylene groups react with the hydroxyl groups of the polarizer such as PVA to form a covalent bond between the adhesive layer and the polarizer. As a result, even in a non-dried state, it is presumed that the adhesiveness of the adhesive layer with the polarizing film is still significantly improved.

系自由基聚合起始劑、二苯基酮系自由基聚合起始劑等為例。前述自由基聚合起始劑，以9-氧硫

系自由基聚合起始劑為佳。9-氧硫

系自由基聚合起始劑，可舉前述通式(1)所示之化合物為例。通式(1)所示之化合物的具體例，可舉例如：9-氧硫

、二甲基9-氧硫

、二乙基9-氧硫

、異丙基9-氧硫

、氯9-氧硫

等。通式(1)所示之化合物中，以R¹及R²為-CH₂CH₃之二乙基9-氧硫

特佳。 In the present invention, the radical polymerization initiator with hydrogen extraction effect can include 9-oxysulfur

Examples include radical polymerization initiators, benzophenone radical polymerization initiators, and the like. The aforementioned radical polymerization initiator is 9-oxysulfur

It is preferably a radical polymerization initiator. 9-oxysulfur

It is a radical polymerization initiator, for example, the compound represented by the aforementioned general formula (1). Specific examples of the compound represented by the general formula (1) include 9-oxysulfur

, Dimethyl 9-oxysulfur

, Diethyl 9-oxysulfur

, Isopropyl 9-oxysulfur

, Chlorine 9-oxysulfur

Wait. In the compound represented by the general formula (1), R ¹ and R ² are -CH ₂ CH ₃ diethyl 9-oxysulfur

Especially good.

In the active energy ray curable adhesive composition, when the radical polymerizable compound with active methylene group and the radical polymerization initiator with hydrogen extraction function are contained, the total amount of the curable component is 100% by weight At this time, the radical polymerizable compound having the aforementioned active methylene group is contained in an amount of 1-50% by weight and 100 parts by weight relative to the total amount of the curable component, and 0.1-10 parts by weight of the radical polymerization initiator is preferably contained.

As mentioned above, in the present invention, in the presence of a radical polymerization initiator with hydrogen extraction, the methylene group of the radical polymerizable compound with active methylene is caused to generate free radicals, and the methylene group Reacts with the hydroxyl group of polarizers such as PVA to form a covalent bond. Therefore, in order to generate free radicals from the methylene group of the radical polymerizable compound having active methylene groups, and to sufficiently form the covalent bond, when the total amount of the curable component is 100% by weight, the active methylene group is contained The radical polymerizable compound of the base is preferably 1-50% by weight, and more preferably contains 3-30% by weight. In order to sufficiently improve the water resistance and improve the adhesiveness in the non-dry state, it is preferable to set the radical polymerizable compound with active methylene group to 1% by weight or more. On the other hand, when it exceeds 50% by weight, poor curing of the adhesive layer may occur. In addition, the radical polymerization initiator with hydrogen extraction action preferably contains 0.1-10 parts by weight, more preferably 0.3-9 parts by weight relative to 100 parts by weight of the total amount of the curable component. In order to allow the hydrogen extraction reaction to proceed sufficiently, the radical polymerization initiator is preferably used at least 0.1 parts by weight. In addition, when it exceeds 10 parts by weight, the composition may not be completely dissolved.

<Cation polymerization hardening adhesive>

The curable component of the cationic polymerization curable adhesive can be a compound having an epoxy group or an oxygen group as an example. The epoxy group-containing compound is not particularly limited as long as it has at least two epoxy groups in the molecule, and various generally known curable epoxy compounds can be used. Preferred epoxy compounds include, for example, compounds having at least two epoxy groups and at least one aromatic ring in the molecule (aromatic epoxy compounds), or compounds having at least two epoxy groups in the molecule, and at least A compound formed between two adjacent carbon atoms constituting an alicyclic ring (alicyclic epoxy compound), etc. However, in the adhesive layer, in order to achieve a component gradient structure related to component A, even when a cationic polymerization hardening type adhesive is used, the active energy ray hardening type adhesive composition still needs to contain logPow which represents the octanol/water distribution coefficient. -1~1 component A and logPow are component B of 2-7.

<Photocationic polymerization initiator>

The curable component of the cationic polymerization curable adhesive contains the epoxy compound and oxygen compound described above. Since these are cured by cationic polymerization, a photocationic polymerization initiator is blended. The photocationic polymerization initiator can be irradiated with active energy rays such as visible rays, ultraviolet rays, X-rays, electron beams, etc., to generate cationic species or Lewis acids, and start the polymerization reaction of epoxy groups or oxygen groups.

<Other ingredients>

The active energy ray-curable adhesive composition of the present invention may also contain the following components.

<Acrylic oligomer>

The active energy ray curable adhesive composition used in the present invention may contain an acrylic system formed by polymerizing (meth)acrylic monomers in addition to the curable component of the radical polymerizable compound or the cationic polymerization curable adhesive. Oligomer. When the active energy ray-curable adhesive composition contains an acrylic oligomer made of polymerized non-polymerizable (meth)acrylic monomers, the composition of the adhesive composition between the polarizer and the transparent protective film will be easier Partial existence makes it easier to obtain a composition gradient structure in which the A component concentration changes in the thickness direction. Therefore, it is better to further improve the adhesion and water resistance of the adhesive layer to the polarizer and the transparent protective film. In addition, the active energy ray-curable adhesive composition contains acrylic oligomer components, which can reduce the active energy rays irradiating the composition. Curing shrinkage during curing, and reduce the interface stress between the adhesive and the polarizer and transparent protective film. As a result, the adhesion between the adhesive layer and the adherend can be prevented from decreasing. In order to obtain the composition gradient structure of the cured material layer (adhesive layer) more reliably and suppress curing shrinkage more fully, when the total amount of the active energy ray-curable adhesive composition is 100% by weight, the acrylic The content of the oligomer is preferably set to 5-30% by weight, and more preferably 10-20% by weight.

基(甲基)丙烯酸酯、2-降

基甲基(甲基)丙烯酸酯、5-降

烯-2-基-甲基(甲基)丙烯酸酯、3- 甲基-2-降

基甲基(甲基)丙烯酸酯等)、含羥基之(甲基)丙烯酸酯類(例如，羥基乙基(甲基)丙烯酸酯、2-羥基丙基(甲基)丙烯酸酯、2,3-二羥基丙基甲基-丁基(甲基)甲基丙烯酸酯等)、含烷氧基或苯氧基之(甲基)丙烯酸酯類(2-甲氧基乙基(甲基)丙烯酸酯、2-乙氧基乙基(甲基)丙烯酸酯、2-甲氧基甲氧基乙基(甲基)丙烯酸酯、3-甲氧基丁基(甲基)丙烯酸酯、乙基卡必醇(甲基)丙烯酸酯、苯氧基乙基(甲基)丙烯酸酯等)、含環氧基之(甲基)丙烯酸酯類(例如，環氧丙基(甲基)丙烯酸酯等)、含鹵素之(甲基)丙烯酸酯類(例如，2,2,2-三氟乙基(甲基)丙烯酸酯、2,2,2-三氟乙基乙基(甲基)丙烯酸酯、四氟丙基(甲基)丙烯酸酯、六氟丙基(甲基)丙烯酸酯、八氟戊基(甲基)丙烯酸酯、十七氟癸基(甲基)丙烯酸酯等)、烷基胺基烷基(甲基)丙烯酸酯(例如，二甲基胺乙基(甲基)丙烯酸酯等)等。該等(甲基)丙烯酸酯可單獨使用或併用2種以上。丙烯酸系寡聚物(A)之具體例，可舉東亞合成社製「ARUFON」、綜研化學社製「ACTFLOW」、BASF JAPAN社製「JONCRYL」等為例。 Considering the workability and uniformity during coating, the active energy ray-curable adhesive composition is preferably low in viscosity, so the acrylic oligomer (A) formed by polymerizing (meth)acrylic monomer is also low The viscosity is better. The low-viscosity acrylic oligomer preferably has a weight average molecular weight (Mw) of 15,000 or less, preferably 10,000 or less, and particularly preferably 5,000 or less. On the other hand, in order to make the components of the adhesive composition interposed between the polarizer and the transparent protective film more localized, the weight average molecular weight (Mw) of the acrylic oligomer (A) is preferably 500 or more, and 1000 or more Preferably, 1500 or more is particularly preferred. Specific examples of the (meth)acrylic monomer constituting the acrylic oligomer (A) include: methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, ( Isopropyl meth)acrylate, 2-methyl-2-nitropropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, S-butyl(meth)acrylate Base) acrylate, tertiary butyl (meth)acrylate, n-pentyl (meth)acrylate, tertiary pentyl (meth)acrylate, 3-pentyl (meth)acrylate, 2,2-di Methyl butyl (meth)acrylate, n-hexyl (meth)acrylate, acetyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 4 -Methyl-2-propylpentyl (meth)acrylate, N-octadecyl (meth)acrylate and other (meth)acrylic acid (carbon number 1-20) alkyl esters, more for example : Cycloalkyl (meth)acrylate (for example, cyclohexyl (meth)acrylate, cyclopentyl (meth)acrylate, etc.), aralkyl (meth)acrylate (for example, benzyl (meth)acrylic acid) Esters, etc.), polycyclic (meth)acrylates (for example, 2-iso

Base (meth)acrylate, 2-drop

Methyl (meth)acrylate, 5-drop

En-2-yl-methyl (meth)acrylate, 3-methyl-2-nor

Methyl (meth)acrylate, etc.), hydroxyl-containing (meth)acrylates (for example, hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2,3 -Dihydroxypropylmethyl-butyl (meth)methacrylate, etc.), (meth)acrylates containing alkoxy or phenoxy (2-methoxyethyl (meth)acrylic acid Ester, 2-ethoxyethyl (meth)acrylate, 2-methoxymethoxyethyl (meth)acrylate, 3-methoxybutyl (meth)acrylate, ethyl card Alcohol (meth)acrylate, phenoxyethyl (meth)acrylate, etc.), epoxy-containing (meth)acrylates (for example, glycidyl (meth)acrylate, etc.) , Halogen-containing (meth)acrylates (for example, 2,2,2-trifluoroethyl (meth)acrylate, 2,2,2-trifluoroethylethyl (meth)acrylate, Tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate, octafluoropentyl (meth)acrylate, heptafluorodecyl (meth)acrylate, etc.), alkylamine Alkyl (meth)acrylate (for example, dimethylaminoethyl (meth)acrylate, etc.) and the like. These (meth)acrylates can be used individually or in combination of 2 or more types. Specific examples of the acrylic oligomer (A) include "ARUFON" manufactured by Toagosei Co., Ltd., "ACTFLOW" manufactured by Soken Chemical Co., Ltd., and "JONCRYL" manufactured by BASF JAPAN.

When the acrylic oligomer (A) is a liquid, the solubility to the adhesive composition does not need to be considered, so it can be preferably used. Acrylic oligomer (A) is a general liquid when the glass transition temperature (Tg) is less than 25°C. In addition, in order to balance compatibility with the adhesive composition and the partial presence of components in the adhesive layer, the acrylic oligomer (A) preferably contains a polar functional group. Examples of polar functional groups include hydroxyl, epoxy, carboxyl, and alkoxysilyl groups. Specifically, for example, "ARUFON UH series", "ARUFON UC series", "ARUFON UF series", "ARUFON UG series", "ARUFON US series" (all manufactured by Toagosei), etc. Among them, since it can be expected to improve the adhesion of the interaction with the polarizer, it is preferable to contain an epoxy group. Specifically, "ARUFON UG-4000" and "ARUFON UG-4010" (all manufactured by Toagosei Co., Ltd.) can be cited as examples.

<Photo Acid Generator>

The active energy ray-curable adhesive composition may contain a photoacid generator. When the active energy ray-curable resin composition contains a photoacid generator, the water resistance and durability of the adhesive layer can be improved drastically compared to the case where the photoacid generator is not included. The photoacid generator can be represented by the following general formula (3).

Formula (3) [Chem 3] L ⁺ X ^-

(However, L ⁺ represents a cation and any of, X ^-. Selected from the group consisting represents _{^{PF6 6 -, SbF 6 -,}} AsF 6 -, SbCl 6 -, BiCl 5 -, SnCl 6 -, ClO 4 -, disulfide The relative anion in the group consisting of urethane anion and SCN-).

A preferable onium cation structure constituting the onium cation L ⁺ of the general formula (3) can be exemplified by the onium cation selected from the following general formulas (4) to (12).

General formula (4) [Chemical 4]

General formula (5)

General formula (6)

General formula (7)

General formula (8) [化8]

General formula (9)

General formula (10)

General formula (11)

General formula (12) [Chem. 12] Ar ⁴ -I ⁺ -Ar ⁵

(In the aforementioned general formulae (4)-(12), but, R ¹ , R ² and R ^{3 each} independently represent selected from a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted Or unsubstituted aryl, substituted or unsubstituted heterocyclic group, substituted or unsubstituted alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted heterocyclic oxy, substituted or unsubstituted acyl A group, a substituted or unsubstituted carbonyloxy group, a substituted or unsubstituted oxycarbonyl group, or a halogen atom group. R ⁴ represents the same group as described in R ¹ , R ² and R ^3. R ⁵ represents substituted or An unsubstituted alkyl group, a substituted or unsubstituted alkylthio group. R ⁶ and R ^{7 each} independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group. R represents a halogen atom, a water acid group, a carboxyl group, Mercapto, cyano, nitro, substituted or unsubstituted aminemethanyl, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted aryl, substituted or unsubstituted heterocyclic group , Substituted or unsubstituted alkoxy, substituted or unsubstituted aryloxy, substituted or unsubstituted heterocyclic oxy, substituted or unsubstituted alkylthio, substituted or unsubstituted arylthio, substituted or unsubstituted Any one of substituted heterocyclic thio group, substituted or unsubstituted acyl group, substituted or unsubstituted carbonyloxy group, substituted or unsubstituted oxycarbonyl group. Ar ⁴ and Ar ⁵ represent substituted or unsubstituted aryl groups, Any one of a substituted or unsubstituted heterocyclic group. X represents an oxygen or sulfur atom. i represents an integer of 0 to 5. j represents an integer of 0 to 4. k represents an integer of 0 to 3. In addition, it may be adjacent Between R, Ar ⁴ and Ar ⁵ , R ² and R ³ , R ² and R ⁴ , R ³ and R ⁴ , R ¹ and R ² , R ¹ and R ³ , R ¹ and R ⁴ , R ¹ and R, or a cyclic structure in which R ¹ and R ^{5 are} bonded to each other.).

Onium cations (aluminium cations) of the general formula (4), for example: dimethyl phenyl sulfonium, dimethyl (o-fluorophenyl) sulfonium, dimethyl (m-chlorophenyl) sulfonium, dimethyl Group (p-bromophenyl) arunnium, dimethyl (p-cyanophenyl) arunnium, dimethyl (m-nitrophenyl) arunnium, dimethyl (2,4,6-tribromophenyl) arunnium , Dimethyl (pentafluorophenyl) sulfonium, dimethyl (p-(trifluoromethyl) phenyl) sulfonium, dimethyl (p-hydroxyphenyl) sulfonium, dimethyl (p-mercaptophenyl) ) Sulfonium, dimethyl (p-methanesulfinyl phenyl) sulfonium, dimethyl (p-methylsulfonyl phenyl) sulfonium, dimethyl (o-acetylphenyl) sulfonium, dimethyl Group (o-benzylphenyl) arunnium, dimethyl (p-methylphenyl) arunnium, dimethyl (p-isopropylphenyl) arunnium, dimethyl (p-octadecylbenzene) Group) arunnium, dimethyl (p-cyclohexylphenyl) arunnium, dimethyl (p-methoxyphenyl) arunnium, dimethyl (o-methoxycarbonylphenyl) arunnium, dimethyl ( p-Phenylsulfonylphenyl) sulfonium, (7-methoxy-2-oxo-2H-benzopiperan-4-yl) dimethyl sulfonium, (4-methoxynaphthalene-1- Base) dimethyl arunnium, dimethyl (p-isopropoxycarbonylphenyl) arunnium, dimethyl (2-naphthyl) arunnium, dimethyl (9-anthryl) arunnium, dimethyl phenyl Arunnium, methyl ethyl phenyl arunnium, methyl diphenyl arunnium, triphenyl arunnium, diisopropyl phenyl arunnium, diphenyl (4-phenylsulfonyl-phenyl)-arunnium, 4, 4'-bis(diphenyl sulfide) diphenyl sulfide, 4,4'-bis[bis[(4-(2-hydroxy-ethoxy)-phenyl)] sulfide]] diphenyl sulfide, 4 ,4'-Bis(diphenyl arunnium) biphenylene, diphenyl (o-fluorophenyl) arunnium, diphenyl (m-chlorophenyl) arunnium, diphenyl (p-bromophenyl) Arunium, diphenyl (p-cyanophenyl) arunium, diphenyl (m-nitrophenyl) arunium, diphenyl (2,4,6-tribromophenyl) arunium, diphenyl (pentafluorobenzene) Group) arunnium, diphenyl (p-(trifluoromethyl) phenyl) arunnium, diphenyl (p-hydroxyphenyl) arunnium, diphenyl (p-mercaptophenyl) arunnium, diphenyl (p -Methylsulfinylphenyl) sulfonium, diphenyl (p-methylsulfonyl phenyl) sulfonium, diphenyl (o-acetylphenyl) sulfonium, diphenyl (o-benzyl phenyl) Phenyl) aunion, diphenyl (p-methylphenyl) arunnium, diphenyl (p-isopropylphenyl) arunnium, diphenyl (p-octadecylphenyl) arunnium, diphenyl ( p-cyclohexylphenyl) arunnium, diphenyl (p-methoxyphenyl) arunnium, diphenyl (o-methoxycarbonylphenyl) arunnium, diphenyl (p-phenylsulfonylbenzene) Group) sulfonium, (7-methoxy-2-oxo-2H-benzopiperan-4-yl) diphenyl sulfonium, (4-methoxynaphthalene-1-yl) diphenyl sulfonium, two Phenyl (p-isopropoxycarbonylphenyl) amenium, diphenyl (2-naphthyl) amenium, diphenyl (9-anthryl) amenium, ethyl diphenyl amenium, methyl ethyl (o -Tolyl) sulfonium, methyl bis (p-tolyl) sulfonium, tris (p-tolyl) sulfonium, diisopropyl (4-phenylsulfonyl phenyl) sulfonium, diphenyl (2-thiophene) Base) sulfonium, diphenyl (2-furyl) sulfonium, diphenyl (9-ethyl-9H carbazole-3 -Base) 鋶, etc., but not limited by these.

The onium cations (tellonium cations) of the general formula (5) include, for example, dimethylphenyl sulfonium, dimethyl (o-fluorophenyl) sulfonium, dimethyl (m-chlorobenzene) Group) sulfonium, dimethyl (p-bromophenyl) sulfonium, dimethyl (p-cyanophenyl) sulfonium, dimethyl (m-nitrophenyl) sulfonium, dimethyl Group (2,4,6-tribromophenyl) sulfonium, dimethyl (pentafluorophenyl) sulfonium, dimethyl (p-(trifluoromethyl) phenyl) sulfonium, two Methyl (p-hydroxyphenyl) sulfonium, dimethyl (p-mercaptophenyl) sulfonium, dimethyl (p-methanesulfinylphenyl) sulfonium, dimethyl (p -Methanesulfonylphenyl) sulfonium, dimethyl (o-acetylphenyl) sulfonium, dimethyl (o-benzylphenyl) sulfonium, dimethyl (p -Methylphenyl) sulfonium, dimethyl (p-isopropylphenyl) sulfonium, dimethyl (p-octadecylphenyl) sulfonium, dimethyl (p-cyclohexyl) Phenyl) sulfonium, dimethyl (p-methoxyphenyl) sulfonium, dimethyl (o-methoxycarbonylphenyl) sulfonium, dimethyl (p-phenylsulfonium) Phenyl)thionylene, (7-methoxy-2-oxo-2H-benzopiperan-4-yl)dimethylthionylene, (4-methoxynaphthalene-1-yl) Dimethyl (p-isopropoxycarbonylphenyl) sulfonium, dimethyl (2-naphthyl) sulfonium, dimethyl (9-anthryl) sulfonium , Diethyl phenyl sulfonium, methyl ethyl phenyl sulfonium, methyl diphenyl sulfonium, triphenyl sulfonium, diisopropyl phenyl sulfonium, diphenyl ( 4-Phenylsulfonyl-phenyl)-thylonium, 4,4'-bis(diphenylthionylene) diphenylsulfide, 4,4'-bis[bis[(4-(2- Hydroxy-ethoxy)-phenyl)]sulfonium]diphenylsulfide, 4,4'-bis(diphenylsulfonium)biphenylene, diphenyl(o-fluorophenyl)ylene Thonium, diphenyl (m-chlorophenyl) sulfonium, diphenyl (p-bromophenyl) sulfonium, diphenyl (p-cyanophenyl) sulfonium, diphenyl (m -Nitrophenyl) sulfonium, diphenyl (2,4,6-tribromophenyl) sulfonium, diphenyl (pentafluorophenyl) sulfonium, diphenyl (p-(trifluorophenyl) (Methyl) phenyl) sulfonium, diphenyl (p-hydroxyphenyl) sulfonium, diphenyl (p-mercaptophenyl) sulfonium, diphenyl (p-methanesulfinylbenzene) Sulfonium, diphenyl (p-methylsulfonylphenyl) sulfonium, diphenyl (o-acetylphenyl) sulfonium, diphenyl (o-benzylbenzene) Sulfonium, diphenyl (p-methylphenyl) sulfonium, diphenyl (p-isopropylphenyl) sulfonium, diphenyl (p-octadecylphenyl) Thonium, diphenyl (p-cyclohexylphenyl) oxonium, diphenyl (p-methoxyphenyl) oxonium, diphenyl (o-methoxycarbonylphenyl) oxonium , Diphenyl (p-phenylsulfonylphenyl) sulfonium, (7-methoxy-2-oxo-2H-benzopiperan-4-yl) diphenyl sulfonium, ( 4-Methoxynaphthalene-1-yl)diphenylsulfonium, diphenyl(p-isopropoxycarbonylphenyl)sulfonium , Diphenyl (2-naphthyl) sulfonium, diphenyl (9-anthryl) sulfonium, ethyl diphenyl sulfonium, methyl ethyl (o-tolyl) sulfonium, Methyl bis(p-tolyl) tolylene, tris(p-tolyl) tolylene, diisopropyl(4-phenylsulfonylphenyl) tolylene, diphenyl(2-thiophene) Yl)sulfonium, diphenyl(2-furyl)sulfonylene, diphenyl(9-ethyl-9Hcarbazol-3-yl)sulfonylene, etc., but are not limited to these.

Onium cation (phosphonium cation) of general formula (6): Examples of phosphonium cations include, for example, trimethylphenylphosphonium, triethylphenylphosphonium, tetraphenylphosphonium, triphenyl( p-fluorophenyl) phosphonium, triphenyl (o-chlorophenyl) phosphonium, triphenyl (m-bromophenyl) phosphonium, triphenyl (p-cyanophenyl) phosphonium, triphenyl Group (m-nitrophenyl) phosphonium, triphenyl (p-phenylsulfonylphenyl) phosphonium, (7-methoxy-2-oxo-2H-benzopiperan-4-yl) )Triphenylphosphonium, triphenyl(o-hydroxyphenyl)phosphonium, triphenyl(o-acetylphenyl)phosphonium, triphenyl(m-benzylphenyl)phosphonium , Triphenyl(p-methylphenyl)phosphonium, triphenyl(p-isopropoxyphenyl)phosphonium, triphenyl(o-methoxycarbonylphenyl)phosphonium, triphenyl (1-naphthyl)phosphonium, triphenyl(9-anthryl)phosphonium, triphenyl(2-thienyl)phosphonium, triphenyl(2-furyl)phosphonium, triphenyl(9 -Ethyl-9Hcarbazol-3-yl)phosphonium, etc., but not limited by these.

Onium cations (pyridine cations) of the general formula (7): Examples of pyridine cations include: N-phenylpyridine, N-(o-chlorophenyl)pyridine, N-(m-chlorophenyl)pyridine, N-(p-cyanophenyl)pyridine, N-(o-nitrophenyl)pyridine, N-(p-acetylphenyl)pyridine, N-(p-isopropylphenyl)pyridine, N- (p-octadecyloxyphenyl)pyridine, N-(p-methoxycarbonylphenyl)pyridine, N-(9-anthryl)pyridine, 2-chloro-1-phenylpyridine, 2-cyano- 1-phenylpyridine, 2-methyl-1-phenylpyridine, 2-vinyl-1-phenylpyridine, 2-phenyl-1-phenylpyridine, 1,2-diphenylpyridine, 2-methyl Oxy-1-phenylpyridine, 2-phenoxy-1-phenylpyridine, 2-acetyl-1-(p-tolyl)pyridine, 2-methoxycarbonyl-1-(p-toluene) Yl)pyridine, 3-fluoro-1-naphthylpyridine, 4-methyl-1-(2-furyl)pyridine, N-methylpyridine, N-ethylpyridine, etc., but not limited by these .

Onium cations (quinolinium cations) of the general formula (8): Examples of quinolinium cations include, for example, N-methylquinolinium, N-ethylquinolinium, N-phenylquinolinium, N-naphthylquinolinium, N-(o-chlorophenyl)quinolinium, N-(m-chlorophenyl)quinolinium, N-(p-cyanophenyl)quinolinium, N-( o-Nitrophenyl)quinolinium, N-(p-acetylphenyl)quinolinium, N-(p-isopropylphenyl)quinolinium, N-(p-octadecyloxybenzene) Yl)quinolinium, N-(p-methoxycarbonylphenyl)quinolinium, N-(9-anthryl)quinolinium, 2-chloro-1-phenylquinolinium, 2-cyano- 1-phenylquinolinium, 2-methyl-1-phenylquinolinium, 2-ethylene-1-phenylquinolinium, 2-phenyl-1-phenylquinolinium, 1,2- Diphenylquinolinium, 2-methoxy-1-phenylquinolinium, 2-phenoxy-1-phenylquinolinium, 2-acetyl-1-phenylquinolinium, 2 -Methoxycarbonyl-1-phenylquinolinium, 3-fluoro-1-phenylquinolinium, 4-methyl-1-phenylquinolinium, 2-methoxy-1-(p- Tolyl) quinolinium, 2-phenoxy-1-(2-furyl) quinolinium, 2-acetyl-1-(2-thienyl) quinolinium, 2-methoxycarbonyl- 1-methylquinolinium, 3-fluoro-1-ethylquinolinium, 4-methyl-1-isopropylquinolinium, etc., but not limited to these.

Onium cations (isoquinolinium cations) of the general formula (9): Examples of isoquinolinium cations include, for example, N-phenylisoquinolinium, N-methylisoquinolinium, and N-ethyl Isoquinolinium, N-(o-chlorophenyl)isoquinolinium, N-(m-chlorophenyl)isoquinolinium, N-(p-cyanophenyl)isoquinolinium, N-( o-Nitrophenyl)isoquinolinium, N-(p-Acetylphenyl)isoquinolinium, N-(p-isopropylphenyl)isoquinolinium, N-(p-octadecyl Oxyphenyl)isoquinolinium, N-(p-methoxycarbonylphenyl)isoquinolinium, N-(9-anthryl)isoquinolinium, 1,2-diphenylisoquinolinium Onium, N-(2-furyl)isoquinolinium, N-(2-thienyl)isoquinolinium, N-naphthylisoquinolinium, etc. are not limited by these.

唑鎓陽離子、苯并噻唑鎓陽離子)：苯并

唑鎓陽離子之例，可舉例如：N-甲基苯并

唑鎓、N-乙基苯并

唑鎓、N-萘基苯并

唑鎓、N-苯基苯并

唑鎓、N-(p-氟苯基)苯并

唑鎓、N-(p-氯苯基)苯并

唑鎓、N-(p-氰苯基)苯并

唑鎓、N-(o-甲氧基羰苯基)苯并

唑鎓、N-(2-呋喃基)苯并

唑鎓、N-(o-氟苯基)苯并

唑鎓、N-(p-氰苯基)苯并

唑鎓、N-(m-硝苯基)苯并

唑鎓、N-(p-異丙氧基羰苯基)苯并

唑鎓、N-(2-噻吩基)苯并

唑鎓、N-(m-羧基苯基)苯并

唑鎓、2-巰-3-苯基苯并

唑鎓、2-甲基-3-苯基苯并

唑鎓、2-甲硫基-3-(4-苯基磺醯基苯基)苯并

唑鎓、6-羥基-3-(p-甲苯基)苯并

唑鎓、7-巰-3-苯基苯并

唑鎓、4，5-二氟-3-乙基苯并

唑鎓等，但並未受該等所限定。 Onium cations of general formula (10) (benzo

Azolium cation, benzothiazolium cation): benzo

Examples of azolium cations include: N-methylbenzo

Azolium, N-ethylbenzo

Azolium, N-naphthylbenzo

Azolium, N-phenylbenzo

Azolium, N-(p-fluorophenyl)benzo

Azolium, N-(p-chlorophenyl)benzo

Azolium, N-(p-cyanophenyl)benzo

Azolium, N-(o-methoxycarbonylphenyl)benzo

Azolium, N-(2-furyl)benzo

Azolium, N-(o-fluorophenyl)benzo

Azolium, N-(p-cyanophenyl)benzo

Azolium, N-(m-nitrophenyl)benzo

Azolium, N-(p-isopropoxycarbonylphenyl)benzo

Azolium, N-(2-thienyl)benzo

Azolium, N-(m-carboxyphenyl)benzo

Azolium, 2-mercapto-3-phenylbenzo

Azolium, 2-methyl-3-phenylbenzo

Azolium, 2-methylthio-3-(4-phenylsulfonylphenyl)benzo

Azolium, 6-hydroxy-3-(p-tolyl)benzo

Azolium, 7-mercapto-3-phenylbenzo

Azolium, 4,5-difluoro-3-ethylbenzo

Azolium, etc., but not limited by these.

Examples of benzothiazolium cations: N-methylbenzothiazolium, N-ethylbenzothiazolium, N-phenylbenzothiazolium, N-(1-naphthyl)benzothiazolium, N- (p-fluorophenyl)benzothiazolium, N-(p-chlorophenyl)benzothiazolium, N-(p-cyanophenyl)benzothiazolium, N-(o-methoxycarbonylbenzene) Group) benzothiazolium, N-(p-tolyl)benzothiazolium, N-(o-fluorophenyl)benzothiazolium, N-(m-nitrophenyl)benzothiazolium, N- (p-isopropoxycarbonylphenyl)benzothiazolium, N-(2-furyl)benzothiazolium, N-(4-methylthiophenyl)benzothiazolium, N-(4- (Phenylsulfonylphenyl)benzothiazolium, N-(2-naphthyl)benzothiazolium, N-(m-carboxyphenyl)benzothiazolium, 2-mercapto-3-phenylbenzo Thiazolium, 2-methyl-3-phenylbenzothiazolium, 2-methylthio-3-phenylbenzothiazolium, 6-hydroxy-3-phenylbenzothiazolium, 7-mercapto-3 -Phenylbenzothiazolium, 4,5-difluoro-3-phenylbenzothiazolium, etc., but not limited by these.

Onium cations of the general formula (11) (furyl or thienyl phosphonium cations): difuryl phosphonium, dithienyl phosphonium, bis(4,5-dimethyl-2-furyl) phosphonium, double (5-Chloro-2-thienyl) phosphonium, bis(5-cyano-2-furyl) phosphonium, bis(5-nitro-2-thienyl) phosphonium, bis(5-acetyl-2 -Furanyl) phosphonium, bis(5-carboxy-2-thienyl) phosphonium, bis(5-methoxycarbonyl-2-furyl) phosphonium, bis(5-phenyl-2-furyl) Ibium, bis(5-(p-methoxyphenyl)-2-thienyl) ydinium, bis(5-vinyl-2-furyl) ydinium, bis(5-ethynyl-2-thienyl) ) Ibium, bis(5-cyclohexyl-2-furanyl) phosphonium, bis(5-hydroxy-2-thienyl) phosphonium, bis(5-phenoxy-2-furyl) phosphonium, double (5-Mercapto-2-thienyl) ionium, bis(5-butylthio-2-thienyl) ionium, bis(5-phenylthio-2-thienyl) ionium, etc., but not subject to These are limited.

Onium cations of the general formula (12) (diarylinium cations): diphenyl phosphonium, bis(p-tolyl) phosphonium, bis(p-octylphenyl) phosphonium, bis(p-octadecyl) Phenylphenyl) phosphonium, bis(p-octyloxyphenyl) phosphonium, bis(p-octadecyloxyphenyl) phosphonium, phenyl(p-octadecyloxyphenyl) phosphonium, 4 -Isopropyl-4'-methyldiphenylinium, (4-isobutylphenyl)-p-tolyliinium, bis(1-naphthyl)inium, bis(4-phenylsulfonium) Phenylphenyl) phosphonium, phenyl (6-benzyl-9-ethyl-9H-carbazol-3-yl) phosphonium, (7-methoxy-2-oxo-2H-benzene Piperan-3-yl)-4'-isopropylphenyl iodonium, etc., but not limited by these.

Next, the relative anion X ^- in the general formula (3) will be explained.

The relative anion X ^- in the general formula (3) is not particularly limited in principle, but a non-nucleophilic anion is preferred. When the relative anion X ^{-is a} non-nucleophilic anion, the nucleophilic reaction is not easy to occur in the coexisting cations in the molecule or in various materials used in combination. As a result, the photoacid generator recorded in the general formula (2) can be improved or used. The time stability of the composition. The non-nucleophilic anion referred to here is an anion with a low ability to produce a nucleophilic reaction. So anion can be cited _{^{PF 6 -, SbF 6 -,}} AsF 6 -, SbCl 6 -, BiCl 5 -, SnCl 6 -, ClO 4 -, two thiamin formate anion, SCN ^- Example.

Anion of the illustrated embodiment, the counter anion of the general formula (3) in the X ^-, in particular PF ₆ ^-, SbF ₆ ^- and AsF ₆ ^- is preferred, particularly preferred may cite PF ₆ ^-, SbF ₆ ^- Example.

Therefore, specific examples of the onium salt constituting the photoacid generator usable in the present invention are the specific examples of the onium cation structure represented by the general formula (3) to the general formula (12) exemplified above and those selected from PF ₆ the onium salt anion consisting of ^{_{- -, SbF 6 -, AsF}} 6 -, SbCl 6 -, BiCl 5 -, SnCl 6 -, ClO 4 -, two thiamin formate anion, SCN.

Specifically, "Cyracure UVI-6992", "Cyracure UVI-6974" (above, manufactured by DOW Chemical Japan Co., Ltd.), "ADEKA OPTOMER SP150", "ADEKA OPTOMER SP152", "ADEKA OPTOMER SP170", "ADEKA OPTOMER SP172" (above, manufactured by ADEKA Co., Ltd.), "IRGACURE250" (manufactured by Chiba Specialty Chemicals), "CI-5102", "CI-2855" (above, manufactured by Soda Corporation), "SAN-AID SI-60L", "SAN-AID SI-80L", "SAN-AID SI-100L", "SAN-AID SI-110L", "SAN-AID SI-180L" (above, manufactured by Sanshin Chemical Co., Ltd.), "CPI-100P", "CPI-100A" (above, manufactured by SAN-APRO Co., Ltd.), "WPI-069", "WPI-113", "WPI-116", "WPI-041", "WPI- 044", "WPI-054", "WPI-055", "WPAG-281", "WPAG-567", "WPAG-596" (above, manufactured by Wako Pure Chemical Industries, Ltd.) as the photoacid generator of the present invention The preferred examples.

The content of the photoacid generator is 10 parts by weight or less, preferably 0.01-10 parts by weight, preferably 0.05-5 parts by weight, and particularly preferably 0.1-3 parts by weight with respect to 100 parts by weight of the total amount of curable ingredients.

<Compounds containing either alkoxy group or epoxy group>

In the active energy ray-curable adhesive composition, a photoacid generator and a compound containing either an alkoxy group or an epoxy group can be used in combination.

(Epoxy-containing compounds and polymers)

When using a compound with one or more epoxy groups in the molecule or a polymer (epoxy resin) with two or more epoxy groups in the molecule, it can also be used in combination with two or more epoxy groups in the molecule. Reactive functional group compound. Here, the functional group having reactivity with the epoxy group may be exemplified by a carboxyl group, a phenolic hydroxyl group, a mercapto group, a primary or secondary aromatic amine group, and the like. Considering the three-dimensional curability, it is particularly good to have two or more of these functional groups in one molecule.

EP4100系列、EP4000系列、EPU系列、DAICEL化學股份有限公司製之Celloxide系列(2021、2021P、2083、2085、3000等)、Epolead系列、EHPE系列、新日鐵化學社製之YD系列、YDF系列、YDCN系列、YDB系列、苯氧基樹脂(由 雙酚類與表氯醇所合成之聚羥基聚醚且兩末端具環氧基；YP系列等)、Nagase chemteX社製之Denacol系列、共榮社化學社製之Epolight系列等，但並未受限為該等。亦可併用2種以上之該等環氧樹脂。另，於計算接著劑層之玻璃轉移溫度Tg時，不將具乙氧基之化合物及高分子列入計算。 Polymers with more than one epoxy group in the molecule. Taking epoxy resin as an example, there are bisphenol A type epoxy resin derived from bisphenol A and epichlorohydrin, and bisphenol A type epoxy resin derived from bisphenol F and epichlorohydrin. Derived bisphenol F epoxy resin, bisphenol S epoxy resin, phenol novolac epoxy resin, cresol novolac epoxy resin, bisphenol A novolac epoxy resin, bisphenol F novolac Type epoxy resin, alicyclic epoxy resin, diphenyl ether type epoxy resin, hydroquinone type epoxy resin, naphthalene type epoxy resin, biphenyl type epoxy resin, sulphur type epoxy resin, trifunctional type Multifunctional epoxy resins such as epoxy resin or tetrafunctional epoxy resin, glycidyl ester epoxy resin, glycidyl amine epoxy resin, hydantoin epoxy resin, heterotrimer Cyanate type epoxy resin, aliphatic chain epoxy resin, etc., these epoxy resins can be halogenated or hydrogenated. Commercially available epoxy resin products include, for example: JER COAT 828, 1001, 801N, 806, 807, 152, 604, 630, 871, YX8000, YX8034, YX4000, DIC Co., Ltd. manufactured by Japan Epoxy Resins Co., Ltd. Epikuron 830, EXA835LV, HP4032D, HP820, manufactured by ADEKA Co., Ltd.

EP4100 series, EP4000 series, EPU series, Celloxide series manufactured by DAICEL Chemical Co., Ltd. (2021, 2021P, 2083, 2085, 3000, etc.), Epolead series, EHPE series, Nippon Steel Chemicals YD series, YDF series, YDCN series, YDB series, phenoxy resin (polyhydroxy polyether synthesized from bisphenols and epichlorohydrin with epoxy groups at both ends; YP series, etc.), Denacol series manufactured by Nagase chemteX, Kyoeisha The Epolight series manufactured by the Chemical Society, etc., but not limited to these. Two or more of these epoxy resins can also be used in combination. In addition, when calculating the glass transition temperature Tg of the adhesive layer, compounds with ethoxy groups and polymers are not included in the calculation.

(Alkoxy-containing compounds and polymers)

The compound having an alkoxy group in the molecule is not particularly limited as long as it has one or more alkoxy groups in the molecule, and well-known ones can be used. Examples of such compounds include melamine compounds, amino resins, and silane coupling agents. In addition, when calculating the glass transition temperature Tg of the adhesive layer, compounds with alkoxy groups and polymers are not included in the calculation.

The blending amount of the compound containing either an alkoxy group or an epoxy group is usually 30 parts by weight or less relative to 100 parts by weight of the total amount of the curable component. If the content of the compound in the composition is too much, the adhesiveness will decrease. When the impact resistance of the drop test deteriorates. The content of the compound in the composition is preferably 20 parts by weight or less. On the other hand, from the viewpoint of water resistance, the compound in the composition preferably contains 2 parts by weight or more, and more preferably contains 5 parts by weight or more.

<Silane Coupling Agent>

When the curable adhesive for polarizing films of the present invention uses an active energy ray curable type, the silane coupling agent is preferably an active energy ray curable compound, but even if it is not active energy ray curable, it can still be given Same water resistance.

Specific examples of the silane coupling agent, active energy ray-curable compounds, for example: vinyl trichlorosilane, vinyl trimethoxysilane, vinyl triethoxy silane, 2-(3,4 epoxycyclohexyl) ) Ethyl trimethoxy silane, 3-glycidoxy propyl trimethoxy silane, 3-glycidoxy propyl methyl diethoxy silane, 3-glycidoxy propyl triethyl Oxysilane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methylpropene Oxopropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-propeneoxypropyltrimethoxysilane, etc.

Preferably, 3-methacryloxypropyl trimethoxysilane and 3-acryloxypropyl trimethoxysilane are preferred.

A specific example of the non-active energy ray-curable silane coupling agent is preferably the silane coupling agent (D1) having an amine group. Specific examples of the amino group-containing silane coupling agent (D1) include: γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltriisopropyl Oxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyl diethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane , Γ-(2-aminoethyl)aminopropylmethyldimethoxysilane, γ-(2-aminoethyl)aminopropyltriethoxysilane, γ-(2-amino) Ethyl)aminopropylmethyl diethoxysilane, γ-(2-aminoethyl)aminopropyltriisopropoxysilane, γ-(2-(2-aminoethyl)amine Ethyl)aminopropyltrimethoxysilane, γ-(6-aminohexyl)aminopropyltrimethoxysilane, 3-(N-ethylamino)-2-methylpropyltrimethoxysilane Silane, γ-ureidopropyltrimethoxysilane, γ-ureidopropyltriethoxysilane, N-phenyl-γ-aminopropyl trimethoxysilane, N-benzyl-γ-amine Trimethoxysilane, N-vinylbenzyl-γ-aminopropyl triethoxysilane, N-cyclohexylaminomethyl triethoxysilane, N-cyclohexylaminomethyl two Ethoxymethylsilane, N-phenylaminomethyltrimethoxysilane, (2-aminoethyl)aminomethyltrimethoxysilane, N,N'-bis[3-(trimethoxysilyl) Propyl]ethylenediamine and other amino-containing silanes; N-(1,3-dimethylbutylene)-3-(triethoxysilyl)-1-propaneamine and other ketimine silanes .

The silane coupling agent (D1) with amine group can be used only by one type or in combination of multiple types. Among them, in order to ensure good adhesion, γ-aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, γ-(2-aminoethyl) Yl)aminopropylmethyldimethoxysilane, γ-(2-aminoethyl)aminopropyl triethoxysilane, γ-(2-aminoethyl)aminopropylmethyl Diethoxysilane, N-(1,3-dimethylbutylene)-3-(triethoxysilyl)-1-propaneamine are preferred.

The blending amount of the silane coupling agent is preferably in the range of 0.01 to 20 parts by weight, preferably 0.05 to 15 parts by weight, and more preferably 0.1 to 10 parts by weight relative to 100 parts by weight of the total amount of the curable component. This is because when the blending amount is more than 20 parts by weight, the storage stability of the adhesive will deteriorate, and when it is less than 0.1 parts by weight, the effect of water-resistant adhesiveness will not be fully exhibited. In addition, when calculating the glass transition temperature Tg of the adhesive layer, the silane coupling agent is not included in the calculation.

Specific examples of active energy ray-curable silane coupling agents other than those mentioned above include, for example, 3-ureidopropyltriethoxysilane, 3-chloropropyltrimethoxysilane, and 3-mercaptopropylmethyl Dimethoxysilane, 3-mercaptopropyltrimethoxysilane, bis(triethoxysilylpropyl) tetrasulfide, 3-isocyanatepropyltriethoxysilane, imidazole silane, etc.

<Additives other than the foregoing>

In addition, various additives can be blended as other optional components in the active energy ray curable adhesive composition used in the present invention within a range that does not impair the purpose and effects of the present invention. The additives include, for example: epoxy resin, polyamide, polyamide imide, polyurethane, polybutadiene, polychloroprene, polyether, polyester, styrene-butadiene Diene block copolymers, petroleum resins, xylene resins, ketone resins, cellulose resins, fluorine-based oligomers, silicone-based oligomers, polysulfide-based oligomers and other polymers or oligomers; Aniline, 2,6-di-tert-butyl-4-methylphenol and other polymerization inhibitors; polymerization initiation aids; leveling agents; wettability modifiers; surfactants; plasticizers; ultraviolet absorbers; inorganic Fillers; pigments; dyes, etc.

With respect to 100 parts by weight of the total amount of the curable component, the aforementioned additives are usually 0-10 parts by weight, preferably 0-5 parts by weight, and most preferably 0-3 parts by weight.

<Viscosity of Adhesive>

The active energy ray-curable adhesive composition used in the present invention contains the aforementioned curable component, but from the viewpoint of coating properties, the viscosity of the adhesive composition is preferably 100 cp or less at 25°C. On the other hand, when the curable adhesive for polarizing films of the present invention is greater than 100 cp at 25°C, the temperature of the adhesive during coating can also be controlled to adjust to 100 cp or less before use. The preferred range of viscosity is 1~80cp, and the best one is 10~50cp. The viscosity can be measured with the E-type viscometer TVE22LT manufactured by Toki Sangyo Co., Ltd.

In addition, from the viewpoint of safety, in the active energy ray curable adhesive composition used in the present invention, the curable component is preferably a material with low skin irritation. Skin irritation can be judged by P.I.I. P.I.I is widely used as an indicator of the degree of skin irritation, and it is measured by the Draize method. The measured value is displayed in the range of 0~8. The smaller the value, the lower the irritation. Because the error of the measured value is large, it is better to use it as a reference value. P.I.I is preferably 4 or less, preferably 3 or less, and most preferably 2 or less.

In the laminated optical film produced by the production method of the present invention, at least the first optical film and the second optical film are laminated through the adhesive layer formed by curing the active energy ray curable adhesive composition.

<Adhesive layer>

The thickness of the adhesive layer formed by the active energy ray-curable adhesive composition is preferably controlled to be 0.1~3μm. The thickness of the adhesive layer is preferably 0.3 to 2 μm, more preferably 0.5 to 1.5 μm. Setting the thickness of the adhesive layer to 0.1 μm or more can prevent poor adhesion due to the cohesive force of the adhesive layer, or appearance defects (bubbles) during lamination. On the other hand, when the adhesive layer is thicker than 3 μm, there is a concern that the polarizing film cannot satisfy durability.

In addition, for the active energy ray-curable adhesive composition, the Tg of the adhesive layer formed by it is preferably 60°C or higher, preferably 70°C or higher, more preferably 75°C or higher, and 100°C or higher. Above ℃ is better, and above 120℃ is better. On the other hand, when the Tg of the adhesive layer is too high, the flexibility of the polarizing film decreases. Therefore, the Tg of the adhesive layer is preferably below 300°C, preferably below 240°C, and more preferably below 180°C. Tg (Glass Transition Temperature) can be measured under the following measuring conditions using the dynamic viscoelastic measuring device RSAIII manufactured by TA Instrument.

Sample size: width 10mm, length 30mm, clamping distance 20mm, measurement mode: stretching, frequency: 1Hz, heating rate: 5°C/min.

Perform dynamic viscoelasticity measurement and use it as the peak top temperature Tg of tanδ.

In addition, the active energy ray-curable adhesive composition is preferably designed so that the storage elasticity coefficient of the adhesive layer formed therefrom is 1.0×10 ⁶ Pa or more in a region where the adhesive layer is formed at 70° C. or lower. It is more preferably 1.0×10 ⁷ Pa or more. The storage elastic coefficient of the adhesive layer will affect the cracks of the polarizer when the polarizing film is thermally cycled (-40°C to 80°C, etc.). When the storage elastic coefficient is low, the polarizer cracks are likely to occur. The temperature range with high storage elasticity coefficient is preferably below 80°C, preferably below 90°C. The storage elasticity coefficient and Tg (glass transition temperature) can be measured using the dynamic viscoelasticity measuring device RSAIII manufactured by TA Instrument at the same time under the same measurement conditions. For the measurement of dynamic viscoelasticity, use the value of the storage elastic coefficient (E').

The manufacturing method of the laminated optical film of the present invention is a method of manufacturing a laminated optical film in which at least a first optical film and a second optical film are laminated on an adhesive layer formed by curing an active energy ray-curable adhesive composition; It is characterized in that the active energy ray curable adhesive composition contains at least two different active energy ray curable adhesive compositions, including a first active energy ray curable adhesive composition and a second active energy ray curable adhesive composition The manufacturing method of the present invention includes the following steps: a coating step of coating the first active energy ray-curable adhesive composition on the bonding surface of the first optical film, and applying the second optical film The bonding surface is coated with the second active energy ray curable adhesive composition; the bonding step is to bond the first optical film and the second optical film; and the next step is to make the first optical film through the adhesive layer Film and the second optical film Next, the adhesive layer is formed by irradiating active energy rays from the first optical film surface side or the second optical film surface side to cure the active energy ray-curable adhesive composition .

Another method for manufacturing a laminated optical film of the present invention is to manufacture a laminated optical film in which at least a first optical film and a second optical film are laminated through an adhesive layer formed by curing an active energy ray-curable adhesive composition Method; characterized in that the active energy ray hardening adhesive composition contains at least two different active energy ray hardening adhesive compositions, including a first active energy ray hardening adhesive composition and a second active energy ray hardening -Type adhesive composition; the manufacturing method includes the following steps: a coating step of applying the first active energy ray-curable adhesive composition on the bonding surface of the first optical film, and then coating the first The coating surface of the active energy ray-curable adhesive composition is further topcoated with the second active energy ray-curable adhesive composition; the laminating step starts from the second coating on the first optical film The coating surface side of the active energy ray-curable adhesive composition is bonded to the second optical film; and the next step is to bond the first optical film and the second optical film through the adhesive layer, and the adhesive layer is It is formed by irradiating active energy rays from the surface side of the first optical film or the surface side of the second optical film to cure the active energy ray-curable adhesive composition.

Furthermore, in the manufacturing method of the laminated optical film of the present invention, when the laminated optical film is a polarizing film, the polarizing member and the transparent protective film may be surface modified before applying the active energy ray-curable adhesive composition deal with. Specific treatments can include corona treatment, plasma treatment, treatment using saponification treatment, etc. as examples.

The coating method of the active energy ray-curable adhesive composition can be appropriately selected depending on the viscosity of the composition or the intended thickness. Examples of coating methods include reverse coaters, gravure coaters (direct, reverse, or offset), rod reverse coaters, roll coaters, die coaters, rod coaters, and bar coaters. In addition, a dipping method or the like can be suitably used for coating.

Through the active energy ray curable adhesive composition applied as described above, two different optical films, such as a polarizer and a transparent protective film, are laminated. The bonding of the polarizer and the transparent protective film can be carried out by roll pressing or the like.

<Hardening of Adhesive>

The active energy ray-curable adhesive composition used in the present invention can be used in electron beam curing type, ultraviolet curing type, and visible light curing type. From the viewpoint of productivity, a visible light-curable adhesive composition is preferably used as an active energy ray-curable adhesive composition.

In the active energy ray-curable adhesive composition, for example, after bonding a polarizer and a transparent protective film, irradiating active energy rays (electron beam, ultraviolet, visible light, etc.) to harden the active energy ray-curing adhesive composition An adhesive layer is formed. The irradiation direction of active energy rays (electron beam, ultraviolet rays, visible rays, etc.) can be irradiated from any appropriate direction. It is better to irradiate from the transparent protective film side. When irradiated from the side of the polarizer, the polarizer may be degraded by active energy rays (electron beam, ultraviolet rays, visible rays, etc.).

In the electron beam curing type, any appropriate conditions can be used as long as the electron beam irradiation conditions are such that the active energy ray curing adhesive composition can be cured. For example, during electron beam irradiation, the acceleration voltage is preferably 5kV~300kV, and more preferably 10kV~250kV. When the acceleration voltage is less than 5kV, the electron beam cannot reach the adhesive, and there is a concern about insufficient curing. When the acceleration voltage is greater than 300kV, the penetration force through the sample is too strong, which may cause damage to the transparent protective film or polarizer. The radiation dose is 5~100kGy, more preferably 10~75kGy. When the irradiation dose is less than 5kGy, the adhesive will not harden enough. When it is more than 100kGy, it will damage the transparent protective film or polarizer, reduce the mechanical strength or produce yellowing, and fail to obtain the predetermined optical properties.

Electron beam irradiation is usually carried out in an inert gas, but it can also be carried out in the atmosphere or under conditions where a small amount of oxygen is introduced as needed. Although it depends on the material of the transparent protective film, by properly introducing oxygen, oxidation damage occurs on the surface of the transparent protective film that the electron beam first touches. This can prevent the electron beam from damaging the transparent protective film, which can effectively only The adhesive is irradiated with electron beams.

In the manufacturing method of the laminated optical film of the present invention, the active energy ray is particularly suitable for the visible light in the wavelength range of 380 nm to 450 nm, and it is particularly preferable to use the active energy ray that has the largest amount of visible light in the wavelength range of 380 nm to 450 nm. In the ultraviolet curing type and visible light curing type, when using a transparent protective film with ultraviolet absorbing energy (ultraviolet non-transmissive transparent protective film), it absorbs light with a shorter wavelength than 380nm and cannot It reaches the active energy ray-curable adhesive and does not contribute to the polymerization reaction. In addition, as the light with a shorter wavelength than 380nm absorbed by the transparent protective film is converted into heat, the transparent protective film itself generates heat, which causes defects such as curling and lines of the polarizing film. Therefore, when ultraviolet curing type and visible light curing type are used in the present invention, it is better to use a device that does not emit light with a shorter wavelength than 380nm as the active energy ray generating device. More specifically, the integrated illuminance in the wavelength range of 380~440nm The integrated illuminance ratio with the wavelength range of 250~370nm is preferably 100:0~100:50, preferably 100:0~100:40. The active energy line of the present invention is preferably a metal halide lamp containing gallium and an LED light source emitting light in the wavelength range of 380 to 440 nm. Or, you can use low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, incandescent lamps, xenon lamps, halogen lamps, carbon arc lamps, metal halide lamps, fluorescent lamps, tungsten lamps, gallium lamps, excimer lasers or Sunlight and other ultraviolet and visible light sources can also be used with bandpass filters to block ultraviolet rays with shorter wavelengths than 380nm. In order to improve the bonding performance of the adhesive layer between the polarizer and the transparent protective film, and prevent the polarizing film from curling, use a metal halide lamp containing gallium and pass through a bandpass filter that can block light with a shorter wavelength than 380nm The obtained active energy ray or the active energy ray with a wavelength of 405 nm obtained by using an LED light source is preferable.

In the ultraviolet curing type or visible light curing type, it is also better to heat the active energy ray curing adhesive after irradiating ultraviolet or visible light (heating after irradiation). In this case, it is better to heat to 40℃ or higher. It is better to heat to above 50°C.

The active energy ray-curable adhesive used in the present invention is particularly suitable for forming an adhesive layer that adheres to a polarizer and a transparent protective film with a light transmittance of less than 5% at a wavelength of 365 nm. Here, the active energy ray curable adhesive of the present invention contains the photopolymerization initiator of the above general formula (1) and irradiates ultraviolet rays through a transparent protective film with UV absorbing energy to harden the adhesive layer. Therefore, in a polarizing film with a transparent protective film with UV absorbing energy on the two areas of the polarizer, the adhesive layer can also be hardened. But, of course, in a polarizing film laminated with a transparent protective film without UV absorption, the adhesive layer can also be hardened. Furthermore, a transparent protective film with UV absorption energy means a transparent protective film with a transmittance of less than 10% to 380nm light.

The method of imparting UV absorbing energy to the transparent protective film includes, for example, a method of containing an ultraviolet absorber in the transparent protective film, or a method of containing a surface treatment layer of an ultraviolet absorber on the surface of the transparent protective film.

系化合物等。 Specific examples of ultraviolet absorbers include: conventionally known oxybenzophenone compounds, benzotriazole compounds, salicylate compounds, benzophenone compounds, and cyanoacrylates. Series compounds, nickel complex salt series compounds, three

Department compounds and so on.

After bonding two different optical films, such as a polarizer and a transparent protective film, irradiate active energy rays (electron beam, ultraviolet, visible light, etc.) to harden the active energy ray hardening adhesive to form an adhesive layer. When bonding the polarizer and the transparent protective film, the moisture content of the polarizer is usually 1% or more, preferably 3% or more, and more preferably 5% or more. In addition, when the moisture content of the polarizer is too high, since the moisture in the polarizer moves toward the mobile adhesive layer after lamination, the B component with a logPOW of 2 to 7 in the adhesive composition will cause layer separation, resulting in poor appearance. good. The moisture content of the polarizer is preferably 18% or less, preferably 15% or less, and most preferably 12% or less. The moisture content of the polarizer was used to cut a sample of 180mm×500mm from the obtained polarizer, and the initial weight (W(g)) was measured. After placing the sample in a dryer at 120°C for 6 hours, the dried weight (D(g)) was measured. From these measured values, the moisture content was calculated using the following formula.

Water content (%)=((W-D)/W)×100

The irradiation direction of active energy rays (electron beam, ultraviolet rays, visible rays, etc.) can be irradiated from any appropriate direction. It is better to irradiate from the transparent protective film side. When irradiated from the side of the polarizer, the polarizer may be degraded by active energy rays (electron beam, ultraviolet rays, visible rays, etc.).

When manufacturing the laminated optical film of the present invention on a continuous production line, although it depends on the curing time of the adhesive, the production line speed is preferably 1~500m/min, preferably 5~300m/min, more preferably 10 ~100m/min. When the production line speed is too slow, the productivity is poor, or the damage to the transparent protective film is too large, and it is impossible to produce a polarizing film that can pass durability tests. When the production line speed is too fast, the curing of the adhesive becomes insufficient, and the desired adhesiveness may not be obtained.

Furthermore, in the manufacturing method of the laminated optical film of the present invention, when the laminated optical film is a polarizing film, the polarizing member and the transparent protective film pass through the adhesive layer formed by the hardened layer of the active energy ray-curable adhesive Laminated, but an easy-to-bond layer can be provided between the transparent protective film and the adhesive layer. The easy-adhesive layer may have, for example, a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone system, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, etc. The formation of various resins. These polymer resins can be used individually by 1 type or in combination of 2 or more types. In addition, other additives may be added to the formation of the easily bonding layer. Specifically, stabilizers such as adhesive excipients, ultraviolet absorbers, antioxidants, and heat-resistant stabilizers can be used more.

Usually, an easy-adhesive layer is pre-arranged on the transparent protective film, and then the easy-adhesive layer side of the transparent protective film and the polarizer are bonded by the adhesive layer. The easy-adhesive layer can be formed by coating the transparent protective film and drying the easy-adhesive layer forming material by a well-known technique. Generally, the easy-adhesive layer forming material is made into a solution diluted to an appropriate concentration after considering the thickness after drying, the smoothness of the coating, etc. The thickness of the easy bonding layer after drying is preferably 0.01 to 5 μm, preferably 0.02 to 2 μm, and more preferably 0.05 to 1 μm. Furthermore, although a plurality of easy bonding layers can be provided, it is still preferable that the total thickness of the easy bonding layers is within the aforementioned range.

<Polarizer>

The manufacturing method of the present invention is particularly useful as a manufacturing method of a polarizing film. The polarizer used in the manufacture of the polarizing film is not particularly limited, and various polarizers can be used. Examples of polarizers include: absorbing dichroic materials such as iodine or dichroic dyes on polyvinyl alcohol-based films, partially formalized polyvinyl alcohol-based films, and ethylene. Partially saponified films of vinyl acetate copolymers and other hydrophilic polymer films are uniaxially stretched to form polyene-based oriented films such as dehydrated polyvinyl alcohol or dehydrated polyvinyl chloride. Among them, a polarizer composed of a polyvinyl alcohol-based film and dichroic substances such as iodine is also preferred. Although the thickness of these polarizers is not particularly limited, it is generally about 80 μm or less.

A polarizer that has a polyvinyl alcohol-based film dyed with iodine and is uniaxially stretched can be produced by, for example, dipping polyvinyl alcohol in an aqueous solution of iodine and dyeing it and stretch it to 3-7 times the original length. If necessary, it may be immersed in an aqueous solution such as boric acid or potassium iodide. If necessary, the polyvinyl alcohol-based film may be immersed in water for washing before dyeing. By washing the polyvinyl alcohol-based film with water, in addition to cleaning the dirt and anti-caking agent on the surface of the polyvinyl alcohol-based film, the polyvinyl alcohol-based film can also be swelled, which has the effect of preventing uneven dyeing. The extension can be performed after dyeing with iodine, or it can be dyed with one side and extended, or dyed with iodine after extension. It can also be extended in aqueous solutions such as boric acid or potassium iodide or in a water bath.

In addition, the active energy ray-curable adhesive composition used in the present invention, when a thin polarizer with a thickness of 10 μm or less is used as a polarizer, can remarkably exhibit its effect (satisfying the optical durability in harsh environments under high temperature and high humidity). Sex). The aforementioned polarizers with a thickness of less than 10μm are relatively more affected by moisture than those with a thickness of greater than 10μm. The optical durability is insufficient in high temperature and high humidity environments, and the transmittance is likely to increase or the degree of polarization decreases. . In other words, when the adhesive layer of the present invention with a block water absorption rate of 10% by weight or less is laminated with a polarizer of 10 μm or less, the water movement of the polarizer in a severe high temperature and high humidity environment is suppressed, thereby enabling Significantly suppress the deterioration of optical durability such as the increase in transmittance of the polarizing film and the decrease in polarization degree. From the viewpoint of thinning, the thickness of the polarizer is preferably 1~7μm. Such a thin polarizer has less uneven thickness, excellent visibility, and less dimensional changes, even from the point of pursuing thinning, the thickness of the polarizing film is also good.

Representative thin polarizers include, for example, Japanese Patent Laid-Open No. 51-069644, Japanese Patent Laid-Open No. 2000-338329, Manual WO2010/100917, Specification of PCT/JP2010/001460, Japanese Patent The thin polarizing film described in the specification No. 2010-269002 or Japanese Patent Application No. 2010-263692. These thin polarizing films can be obtained by a manufacturing method including a step of stretching a polyvinyl alcohol-based resin (hereinafter also referred to as PVA-based resin) layer and a resin substrate for stretching in the state of a laminate, and a step of dyeing. As long as this method is used, even if the PVA-based resin layer is thin, it can be supported by the resin base material for stretching, and it can be stretched without problems such as breakage due to stretching.

The aforementioned thin polarizing film includes the stretching step and the dyeing step in the state of the laminate. From the point of view that it can be stretched at a high magnification to improve the polarization performance, such as WO2010/100917 manual, PCT/JP2010/001460 It is preferred that the preparation method includes the step of extending in the boric acid aqueous solution described in the specification or Japanese Patent Application No. 2010-269002 or Japanese Patent Application No. 2010-263692, especially by Japanese Patent Application No. 2010-269002 It is preferable to obtain the production method including the step of supplementary aerial stretching before stretching in the boric acid aqueous solution described in the specification or Japanese Patent Application No. 2010-263692.

The thin high-performance polarizing film described in the aforementioned PCT/JP2010/001460 specification is a thin high-performance polarizing film with a thickness of 7μm or less composed of PVA-based resin with a dichroic substance orientated and formed integrally on a resin substrate. , It has the optical characteristics of monomer transmittance above 42.0% and polarization degree above 99.95%.

The aforementioned thin high-performance polarizing film can be manufactured by coating PVA-based resin on a resin substrate with a thickness of at least 20μm and drying to form a PVA-based resin layer, and then impregnating the resulting PVA-based resin layer in a dichroic substance. In the liquid, the dichroic substance is adsorbed on the PVA-based resin layer, and then the PVA-based resin layer with the dichroic substance adsorbed in the boric acid aqueous solution is stretched together with the resin base material until the total stretching ratio is more than 5 times the original length .

In addition, there is a method of manufacturing a laminate film containing a thin high-performance polarizing film with dichroic substances oriented, which comprises the following steps: a step of generating a laminate film containing a resin matrix having a thickness of at least 20 μm The PVA-based resin layer is formed by coating and drying an aqueous solution containing PVA-based resin on one side of the resin substrate; the adsorption step is by forming the resin-containing substrate and forming on one side of the resin substrate The aforementioned laminate film of the PVA-based resin layer is immersed in a dye solution containing a dichroic substance to make the PVA-based resin layer contained in the laminate film adsorb the dichroic substance; the stretching step will contain the absorbed dichroic substance The aforementioned laminate film of the PVA-based resin layer of the substance is stretched in a boric acid aqueous solution to a total stretching ratio of more than 5 times the original length; the step of manufacturing the laminate film that has been formed into a thin high-performance polarizing film will absorb The PVA-based resin layer of the dichroic substance extends together with the resin substrate, and a thin high-performance polarizing film composed of the PVA-based resin layer with the dichroic substance oriented is formed on one side of the resin substrate. The thickness is 7μm or less, and has the optical characteristics of monomer transmittance of 42.0% or more and polarization degree of 99.95% or more; the aforementioned thin high-performance polarizing film can be produced by the above-mentioned manufacturing method.

The thin polarizing film of the aforementioned Japanese Patent Application No. 2010-269002 or Japanese Patent Application No. 2010-263692 is a continuous web polarized light composed of PVA-based resins with dichroic substances oriented The film is a laminate containing a PVA-based resin layer formed by forming a film on an amorphous ester-based thermoplastic resin substrate, and is stretched by a two-stage stretching step consisting of air-assisted stretching and boric acid water stretching to make 10μm The following thickness is made. The thin polarizing film is preferably made to have the following optical characteristics: when the monomer transmittance is T and the polarization degree is P, it satisfies P>-(100.929T-42.4-1)×100 (but, T<42.3), and P≧99.9 (but T≧42.3).

Specifically, the aforementioned thin polarizing film can be manufactured by a thin polarizing film manufacturing method including the following steps: by forming a film on a continuous network of amorphous ester-based thermoplastic resin layer of a PVA-based resin layer. Stretching at high temperature, the step of generating an extended intermediate product consisting of an oriented PVA-based resin layer; if the dichroic substance is adsorbed on the extended intermediate product, a dichroic substance (with iodine or iodine and organic A mixture of dyes is preferred) The step of a colored intermediate product formed by an oriented PVA-based resin layer; by extending the colored intermediate product in water with boric acid, a PVA-based resin layer with oriented dichroic substances is formed The step of polarizing film with a thickness of 10μm or less.

In this manufacturing method, the total stretching ratio of the PVA-based resin layer formed on the amorphous ester-based thermoplastic resin substrate by using high-temperature stretching in the air and stretching in the boric acid water is preferably 5 times or more. The liquid temperature of the boric acid aqueous solution used for extension in the boric acid water can be set to 60°C or higher. Before stretching the colored intermediate product in the boric acid aqueous solution, it is preferable to perform an insolubilization treatment on the colored intermediate product. In this case, it is preferable to carry out by immersing the colored intermediate product in a boric acid aqueous solution whose liquid temperature does not exceed 40°C. The aforementioned amorphous ester-based thermoplastic resin substrate can be used: copolymerized polyethylene terephthalate copolymerized with isophthalic acid, copolymerized polyethylene terephthalate copolymerized with cyclohexane dimethanol Diester or amorphous polyethylene terephthalate containing other copolymerized polyethylene terephthalate, preferably made of transparent resin, and its thickness can be the thickness of the PVA-based resin layer of the film More than 7 times. In addition, the stretching ratio for high-temperature stretching in the air is preferably 3.5 times or less, and the stretching temperature for high-temperature stretching in the air is above the glass transition temperature of the PVA-based resin, specifically, preferably within the range of 95°C to 150°C. When the free end uniaxial stretching is used for high-temperature stretching in the air, the total stretching ratio of the PVA-based resin layer formed on the amorphous ester-based thermoplastic resin substrate is preferably 5 times or more and 7.5 times or less. In addition, when the fixed-end uniaxial stretching is used for high-temperature stretching in the air, the total stretching ratio of the PVA-based resin layer formed on the amorphous ester-based thermoplastic resin substrate is preferably 5 times or more and 8.5 times or less.

More specifically, a thin polarizing film can be manufactured by the following method.

A continuous net-like substrate of isophthalic acid copolymerized polyethylene terephthalate (amorphous PET) copolymerized with 6 mol% isophthalic acid was produced. The glass transition temperature of amorphous PET is 75°C. A laminate composed of a continuous net-like amorphous PET substrate and a polyvinyl alcohol (PVA) layer was produced as follows. In addition, the glass transition temperature of PVA is 80°C.

Prepare 200μm thick amorphous PET substrate and 4~5% concentration of PVA aqueous solution. The PVA aqueous solution is made by dissolving PVA powder with a degree of polymerization of 1000 or more and a saponification degree of 99% or more in water. Next, a PVA aqueous solution was coated on a 200μm thick amorphous PET substrate and then dried at a temperature of 50-60°C to obtain a laminate with a 7μm thick PVA layer formed on the amorphous PET substrate.

By the following steps including the two-stage stretching step of air-assisted stretching and boric acid water stretching, the laminated system containing the 7μm thick PVA layer is formed into a 3μm thick thin high-performance polarizing film. Through the air-assisted stretching step in the first paragraph, the laminate containing the 7μm thick PVA layer and the amorphous PET substrate are stretched together to produce the stretched laminate containing the 5μm thick PVA layer. Specifically, the stretched laminate is a stretcher in which a laminate containing a 7μm thick PVA layer is placed in an oven set at a stretch temperature of 130°C, and then stretched uniaxially at the free end to a stretch ratio of 1.8 times By. Through this stretching process, the PVA layer contained in the stretched laminate will be changed into a 5 μm thick PVA layer in which PVA molecules have been oriented.

Then, iodine is adsorbed on the 5 μm thick PVA layer in which the PVA molecules have been oriented by a dyeing step to form a colored laminate. Specifically, this colored laminate is immersed in a dyeing solution containing iodine and potassium iodide at a liquid temperature of 30°C for an arbitrary period of time, so that the monomer transmittance of the PVA layer that constitutes the final high-performance polarizing film is 40~44%, so that iodine is adsorbed on the PVA layer contained in the stretch laminate. In this step, the dyeing solution uses water as a solvent, and the iodine concentration is set to be in the range of 0.12 to 0.30 wt%, and the potassium iodide concentration is set to be in the range of 0.7 to 2.1 wt%. The concentration ratio of iodine to potassium iodide is 1:7. In addition, potassium iodide is required to dissolve iodine in water. In more detail, by immersing the stretched laminate in a dyeing solution with an iodine concentration of 0.30% by weight and a potassium iodide concentration of 2.1% by weight for 60 seconds, a colored laminate with iodine adsorbed on a 5 μm thick PVA layer in which PVA molecules are oriented is generated.

In addition, through the second stage of the boric acid water stretching step, the colored laminate and the amorphous PET substrate are stretched together to produce an optical film laminate containing a 3μm thick PVA layer constituting a high-performance polarizing film. Specifically, the optical film laminate is an extension device that places the colored laminate in an extension device equipped with a boric acid aqueous solution containing boric acid and potassium iodide and a liquid temperature range of 60~85°C, and then uniaxially extends to the free end The extension ratio is 3.3 times. More specifically, the liquid temperature of the boric acid aqueous solution is 65°C. In addition, the content of boric acid was set to 4 parts by weight relative to 100 parts by weight of water, and the content of potassium iodide was set to 5 parts by weight relative to 100 parts by weight of water. In this step, firstly, the colored layered body with the adjusted iodine adsorption amount is immersed in the boric acid aqueous solution for 5-10 seconds. After that, the colored layered body is directly passed through the stretching device equipped in the processing device, that is, between the plural sets of rollers with different circumferential speeds, and uniaxially stretched at the free end for 30 to 90 seconds, until the stretch magnification is 3.3 times. By this stretching treatment, the PVA layer contained in the colored laminate is turned into a 3 μm thick PVA layer in which adsorbed iodine and polyiodide ion complexes are highly oriented in one direction. The PVA layer will constitute the high-performance polarizing film of the optical film laminate.

Although it is not a necessary step for the manufacture of the optical film laminate, the optical film laminate is taken out from the boric acid aqueous solution by the washing step, and the 3μm thick PVA film formed on the amorphous PET substrate is washed with the potassium iodide aqueous solution The boric acid attached to the surface of the layer is preferred. After that, the cleaned optical film laminate was dried by a drying step performed with warm air at 60°C. In addition, the washing step is a step for removing appearance defects such as boric acid precipitation.

Although it is not a necessary step for the manufacture of optical film laminates, it is also possible to apply the adhesive to the 3μm thick PVA layer formed on the amorphous PET substrate through the laminating and/or transfer step. After laminating the 80μm-thick cellulose triacetate film on one side, the amorphous PET substrate is peeled off, and the 3μm-thick PVA layer is transferred to the 80μm-thick cellulose triacetate film.

[Other steps]

In addition to the aforementioned steps, the aforementioned manufacturing method of the thin polarizing film may also include other steps. Other steps can include insolubilization step, cross-linking step, drying (adjustment of moisture content) step, etc. as examples. Other steps can be performed at any appropriate timing.

The typical insolubilization step described above can be performed by immersing the PVA-based resin layer in a boric acid aqueous solution. By performing insolubilization treatment, water resistance can be imparted to the PVA-based resin layer. Relative to 100 parts by weight of water, the concentration of the boric acid aqueous solution is preferably 1 part by weight to 4 parts by weight. The liquid temperature of the insolubilization bath (boric acid aqueous solution) is preferably 20℃~50℃. It is preferable to perform an insolubilization step after the laminate is made, before the dyeing step or the water extension step.

The representative cross-linking step described above can be performed by immersing the PVA-based resin layer in an aqueous boric acid solution. The cross-linking treatment can impart water resistance to the PVA-based resin layer. Relative to 100 parts by weight of water, the concentration of the boric acid aqueous solution is preferably 1 part by weight to 4 parts by weight. In addition, when the cross-linking step is performed after the aforementioned dyeing step, it is more preferable to blend an iodide. By blending iodide, the elution of iodine adsorbed on the PVA-based resin layer can be suppressed. Relative to 100 parts by weight of water, the blending amount of iodide is preferably 1 part by weight to 5 parts by weight. Specific examples of the iodide are as described above. The temperature of the cross-linking bath (aqueous solution of boric acid) is preferably 20℃~50℃. It is better to perform the cross-linking step before the second boric acid water extension step. A preferred embodiment is to sequentially perform the dyeing step, the cross-linking step and the second boric acid water extension step.

<Transparent protective film>

烯構造之聚烯烴、如乙烯．丙烯共聚物之聚烯烴系聚合物、氯化乙烯基系聚合物、尼龍或芳香族聚醯胺等醯胺系聚合物、醯亞胺系聚合物、碸系聚合物、聚醚碸系聚合物、聚醚醚酮系聚合物、聚苯硫系聚合物、乙烯醇系聚合物、氯化亞乙烯基系聚合物、乙烯基丁醛系聚 合物、芳酯系聚合物、聚氧基亞甲基系聚合物、環氧系聚合物、或前述聚合物之摻合物等，亦可舉例作為形成前述透明保護薄膜之聚合物之例。透明保護薄膜中可任意含有1種以上適當之添加劑。添加劑可舉例如：紫外線吸收劑、抗氧化劑、滑劑、可塑劑、脫模劑、著色防止劑、難燃劑、核劑、帶電防止劑、顏料、著色劑等。透明保護薄膜中前述熱可塑性樹脂之含量，以50~100重量%為佳，較佳者是50~99重量%、更佳者為60~98重量%，特佳者是70~97重量%。透明保護薄膜中前述熱可塑性樹脂之含量為50重量%以下，有未能充分地顯現熱可塑性樹脂原本具有之高透明性等的疑慮。 The material for forming the transparent protective film provided on one or both sides of the aforementioned polarizer is preferably one that is excellent in transparency, mechanical strength, thermal stability, water resistance, isotropy, etc. Examples include polyester polymers such as polyethylene terephthalate or polyethylene naphthalate, cellulose polymers such as diacetyl cellulose or cellulose triacetate, polymethyl methyl Acrylic polymers such as acrylate, polystyrene or acrylonitrile. Styrenic polymers such as styrene copolymer (AS resin), polycarbonate polymers, etc. Also, polyethylene, polypropylene, ring system or lower

Polyolefin of olefin structure, such as ethylene. Polyolefin-based polymers of propylene copolymers, chlorinated vinyl-based polymers, amide-based polymers such as nylon or aromatic polyamides, imine-based polymers, chrysene-based polymers, and polyether chrysene-based polymers , Polyetheretherketone series polymer, polyphenylene sulfide series polymer, vinyl alcohol series polymer, chlorinated vinylidene series polymer, vinyl butyral series polymer, aryl ester series polymer, polyoxymethylene Base polymers, epoxy-based polymers, or blends of the aforementioned polymers, etc., can also be exemplified as examples of polymers forming the aforementioned transparent protective film. The transparent protective film can optionally contain one or more appropriate additives. Examples of additives include ultraviolet absorbers, antioxidants, slip agents, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, colorants, and the like. The content of the aforementioned thermoplastic resin in the transparent protective film is preferably 50 to 100% by weight, preferably 50 to 99% by weight, more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight. The content of the aforementioned thermoplastic resin in the transparent protective film is 50% by weight or less, and there are doubts that the high transparency inherent in the thermoplastic resin cannot be sufficiently expressed.

In addition, the transparent protective film is a polymer film described in Japanese Patent Laid-Open No. 2001-343529 (WO01/37007), and may include, for example: (A) those having substituted and/or unsubstituted imino groups in the side chain A thermoplastic resin and (B) a resin composition of a thermoplastic resin having substituted and/or unsubstituted phenyl groups and nitrile groups in the side chain. Specific examples include an interactive copolymer composed of isobutylene and N-methyl maleimide, and acrylonitrile. Take a styrene copolymer resin composition film as an example. As the film, a film composed of a mixed extrusion product of a resin composition or the like can be used. Because the retardation of these films is small and the photoelasticity coefficient is small, it can remove the unevenness caused by the distortion of the polarizing film, and because the moisture permeability is small, the humidification durability is excellent.

In the aforementioned polarizing film, the moisture permeability of the aforementioned transparent protective film is preferably 150 g/m ² /24h or less. According to this structure, the moisture in the air will not easily enter the polarizing film, which can suppress the change in the moisture content of the polarizing film itself. As a result, the curling or dimensional change of the polarizing film caused by the storage environment can be suppressed.

The material forming the transparent protective film on one or both sides of the aforementioned polarizer is preferably one with excellent transparency, mechanical strength, thermal stability, water resistance, isotropy, etc., especially with a moisture permeability of 150g/m ² / It is preferably less than 24h, particularly preferably less than 140g/m ² /24h, and more preferably less than 120g/m ² /24h. The moisture permeability can be obtained by the method described in the examples.

烯構造之環狀烯烴系樹脂、(甲基)丙烯酸系樹脂、或該等之混合體。前述樹脂中，以聚碳酸酯系樹脂、環狀聚烯烴系樹脂、(甲基)丙烯酸系樹脂為佳，特別以環狀聚烯烴系樹脂、(甲基)丙烯酸系樹脂為佳。 The material for forming a transparent protective film that satisfies the aforementioned low moisture permeability can be, for example, polyester resin such as polyethylene terephthalate or polyethylene naphthalate; polycarbonate resin; arylate resin; nylon or Aromatic polyamides and other amide resins; such as polyethylene, polypropylene, ethylene. Polyolefin polymer of propylene copolymer, with ring system or lower

Cyclic olefin resins with olefin structure, (meth)acrylic resins, or a mixture of these. Among the aforementioned resins, polycarbonate resins, cyclic polyolefin resins, and (meth)acrylic resins are preferred, and cyclic polyolefin resins and (meth)acrylic resins are particularly preferred.

The thickness of the transparent protective film can be appropriately determined. Generally speaking, it is about 1 to 100 μm in terms of workability such as strength, handling properties, and thin layer properties. Especially preferably 1~80μm, preferably 3~60μm.

Furthermore, when transparent protective films are provided on both sides of the polarizer, transparent protective films composed of the same polymer material can be used on the front and back sides, or transparent protective films composed of different polymer materials can also be used. From the viewpoint of moisture permeability, the combination of transparent protective film includes polyethylene terephthalate film and cyclic polyolefin resin film, (meth)acrylic resin film and cyclic polyolefin resin film, A combination of (meth)acrylic resin film and (meth)acrylic resin film is preferred. By arranging a transparent protective film with low moisture permeability on both sides of the polarizer, moisture will not easily enter the polarizing film, especially a polarizing film with excellent water resistance can be obtained.

Functional layers such as hard coat, anti-reflection layer, anti-adhesion layer, diffusion layer, or anti-glare layer can be provided on the surface of the polarizing member to which the aforementioned transparent protective film is not attached. Furthermore, the aforementioned functional layers such as hard coat, anti-reflection layer, anti-adhesive layer, diffusion layer, or anti-glare layer can be provided as a transparent protective film itself, or other objects other than a non-transparent protective film can also be used as a configuration. .

<Optical Film>

In actual use, the polarizing film of the present invention can be used as an optical film layered with other optical layers. The optical layer is not particularly limited, but one layer or two or more layers can be used. For example, it can be used for reflective plates, semi-transmissive plates, retardation plates (including 1/2 or 1/4 wavelength plates), and viewing angle compensation films. Optical layer formed in liquid crystal display devices, etc. In particular, the following is preferred: a reflective polarizing film or a semi-transmissive polarizing film formed by laminating a reflective plate or a semi-transmissive reflective plate on the polarizing film of the present invention, an elliptical polarizing film formed by laminating a phase difference plate on the polarizing film or Circular polarizing film, wide viewing angle polarizing film formed by laminating viewing angle compensation film on polarizing film, or polarizing film formed by laminating brightness enhancement film on polarizing film.

The optical film in which the aforementioned optical layer is laminated on the polarizing film can also be formed in a sequential manner during the manufacturing process of liquid crystal display devices, etc. However, if the optical film is pre-laminated to make the optical film, it has excellent quality stability or assembly operations and can improve the liquid crystal Advantages of manufacturing steps such as display devices. For the build-up layer, an appropriate bonding method such as an adhesive layer can be used. When following the aforementioned polarizing film or other optical films, the optical axis of the optical axis can correspond to the objective retardation characteristics, etc., and become an appropriate arrangement angle.

In an optical film in which at least one layer of the aforementioned polarizing film or polarizing film is laminated, an adhesive layer for bonding with other members such as liquid crystal cells may also be provided. Although the adhesive for forming the adhesive layer is not particularly limited, it can be appropriately selected and used, for example, acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine-based Or a rubber-based polymer as the matrix polymer. In particular, it is preferable to use an acrylic adhesive that exhibits excellent optical transparency, moderate wettability, agglomeration, and adhesive properties, and is excellent in weather resistance or heat resistance.

The adhesive layer can also be an overlapping layer of objects of different compositions or types, etc., which are arranged on one or both sides of the polarizing film or the optical film. Moreover, when it is installed on both sides, adhesive layers with different compositions, types, or thicknesses can also be formed on the front and back of the polarizing film or optical film. The thickness of the adhesive layer can be appropriately determined depending on the purpose of use or adhesion, etc., generally 1~500μm, preferably 1~200μm, especially 1~100μm.

Before actual use, the exposed surface of the adhesive layer is temporarily installed with isolation members for covering for the purpose of preventing contamination. This prevents contact with the adhesive layer under normal conditions. In addition to the aforementioned thickness conditions, the spacer member can be any suitable one used in the past, for example, plastic film, rubber sheet, paper, cloth, non-woven fabric, net, foam sheet or metal foil, laminates of these, etc. Appropriate sheets are coated with appropriate release agents such as silicone, long-chain alkyl, fluorine, or molybdenum sulfide.

<Image display device>

The polarizing film or optical film of the present invention is suitable for the formation of various devices such as liquid crystal display devices. The formation of the liquid crystal display device can be performed according to the past. That is, a liquid crystal display device can generally be formed by appropriately assembling constituent parts such as a liquid crystal cell, a polarizing film or an optical film, and an illumination system as required, and incorporating a driving circuit, etc., in addition to the use of the polarizing film or Other than the optical film, it is not particularly limited, and it can be performed in a conventional manner. The liquid crystal cell can be any type such as TN type, STN type, and π type.

It can be formed in a liquid crystal display device with polarizing films or optical films arranged on one or both sides of the liquid crystal cell, or a suitable liquid crystal display device such as a backlight or reflector used in the lighting system. At this time, the polarizing film or optical film of the present invention can be provided on one side or both sides of the liquid crystal cell. When polarizing films or optical films are provided on both sides, they may be the same or different. In addition, when forming a liquid crystal display device, for example, a diffuser, an anti-glare layer, an anti-reflection film, a protective plate, a lens array, a lens array sheet, a light diffuser, a backlight, and other appropriate parts can be arranged in one or two layers. Above the level in the appropriate position.

[Example]

The embodiments of the present invention are described below, but the embodiments of the present invention are not limited by these.

Manufacturing example 1

<Production of polyvinyl alcohol thin polarizer (equivalent to the first optical film)>

In order to make a thin polarizer, firstly, a laminate with a 24μm thick PVA layer was formed on an amorphous PET substrate by air-assisted extension at an extension temperature of 130°C to produce an extension laminate, and then stretched by dyeing The laminated body produces a colored laminated body, and then stretched in boric acid water at a stretching temperature of 65 degrees to extend the colored laminated body together with an amorphous PET substrate to a total stretching ratio of 5.94 times to produce an optics containing a 10μm thick PVA layer Thin film laminate. In this way, an optical film laminate containing a PVA layer with a thickness of 10 μm can be produced, in which the PVA molecules of the PVA layer formed by the two-stage extension on the amorphous PET substrate are highly oriented and adsorbed by dyeing Iodine is highly oriented in one direction as a polyiodide ion complex.

Manufacturing example 2

<Production of transparent protective film (equivalent to the second optical film)>

系紫外線吸收劑(ADEKA社製，商品名：T-712)0.62重量份，於雙軸捏和機中以220℃混合，製作樹脂顆粒。使所得之樹脂顆粒以100.5kPa、100℃乾燥12小時，以單軸擠壓機於模具溫度270℃中自T字模擠壓，成形為薄膜狀(厚度160μm)。再將該薄膜於其搬送方向上150℃之環境氣體下延伸(厚度80μm)，接著塗布含水性胺基甲酸酯樹脂之易接著劑後，於與薄膜搬送方向垂直的方向上於150℃之環境氣體下延伸，得到厚度40μm(透濕度58g/m²/24h)的丙烯酸薄膜(透明保護薄膜)。 100 parts by weight of the imidized MS resin described in Production Example 1 of JP 2010-284840 A

0.62 parts by weight of an ultraviolet absorber (manufactured by ADEKA, trade name: T-712) was mixed in a biaxial kneader at 220°C to prepare resin pellets. The obtained resin pellets were dried at 100.5 kPa and 100°C for 12 hours, and extruded from a T-die with a uniaxial extruder at a die temperature of 270°C to form a film (thickness 160 μm). Then the film was stretched under an atmosphere of 150°C in the conveying direction (thickness 80μm), and then coated with an easy-adhesive agent of water-based urethane resin, and then heated at 150°C in the direction perpendicular to the film conveying direction. It stretched under ambient air to obtain an acrylic film (transparent protective film) with a thickness of 40 μm (humidity permeability 58 g/m ² /24 h).

<The moisture permeability of transparent protective film>

Measure the moisture permeability according to the moisture permeability test of JIS Z0208 (cylinder plate method). Place the sample cut into a diameter of 60mm into a moisture-permeable cylindrical plate containing about 15g of calcium chloride, and then place it in a thermostat with a temperature of 40°C and a humidity of 90%RH, and measure the chlorination of about 24 hours The weight of calcium increases, and the moisture permeability (g/m ² /24h) is obtained.

<Active Energy Line>

Active energy ray, using visible light (metal halide lamp containing gallium) irradiation device: Fusion UV Systems, Inc. Light HAMMER10 valve: V valve peak illuminance: 1600mW/cm ² , cumulative irradiation amount 1000/mJ/cm ² ( Wavelength 380~440nm). In addition, the Sola-Check system manufactured by Solatell was used to measure the illuminance of visible light.

Example 1

Adjust the active energy ray curable adhesive composition containing the following compounds.

The first active energy ray curable adhesive composition (liquid viscosity 350mPa·s/25°C); HEAA 94% by weight, IRGACURE907 3% by weight, and KAYACURE DETX-S 3% by weight.

The second active energy ray curable adhesive composition (liquid viscosity 10mPa·s/25°C); Light Acrylate 1,9ND-A 94% by weight, IRGACURE907 3% by weight, and KAYACURE DETX-S 3% by weight.

，日本化藥社製。 The compound used is HEAA: hydroxyethyl acrylamide, LogPow=-0.56, manufactured by Xingren, Light Acrylate 1,9ND-A: 1,9-nonanediol diacrylate, logPow=3.68, Kyoei Chemical Corporation, IRGACURE907: 2-Methyl-1-(4-methylthiophenyl)-2-morpholinopropane-1-one, BASF Corporation, KAYACURE DETX-S: Diethyl 9-oxysulfur

, Nippon Kayakusha.

(Production of polarizing film)

On the PVA layer of the thin polarizer corresponding to the first optical film, the first active energy ray curable adhesive composition (adhesive layer thickness 0.3 μm) heated to 40°C to adjust the liquid viscosity to 80 cp was applied. In addition, the second active energy ray-curable adhesive composition (adhesive layer thickness: 0.7 μm) was applied to the bonding surface of the transparent protective film corresponding to the second optical film, and then the adhesive composition was bonded with a roller. The ratio of the first active energy ray curable adhesive composition to the second active energy ray curable adhesive composition is 30:70. After that, the visible rays were irradiated on both sides to cure the first and second active energy ray-curable adhesive compositions, and then dried in hot air at 70°C for 3 minutes to obtain a polarizing film (laminated layer) with transparent protective films on both sides of the polarizer. Optical film). Laminate at a line speed of 25m/min.

The polarizing film obtained in the foregoing Example 1 was evaluated for the adhesion of the thin polarizer and the transparent protective film. In addition, the contact angle of the first active energy ray hardening adhesive composition to the thin polarizer and the contact angle of the second active energy ray hardening adhesive composition to the transparent protective film were evaluated. In addition, the evaluation of the contact angle is based on JIS-K 6768. The evaluation results are shown in Table 2.

Example 2

Except that the application step of applying the second active energy ray curable adhesive composition to the bonding surface of the transparent protective film corresponding to the second optical film was changed to the following application step, the same as in Example 1 Method: Obtain a polarizing film (multilayer optical film) with transparent protective films on both sides of the polarizer: the first active energy ray hardening adhesive is applied to the bonding surface of the thin polarizer equivalent to the first optical film The coating surface of the object is further topcoated except for the second active energy ray-curable adhesive composition.

Comparative example 1

Coat the bonding surface of the thin polarizer equivalent to the first optical film with the first activity containing 47% by weight of HEAA, 47% by weight of Light Acrylate1,9ND-A, 3% by weight of IRGACURE907, and 3% by weight of KAYACURE DETX-S Energy ray-curable adhesive composition (liquid viscosity 21mPa·s/25°C), and a transparent protective film equivalent to the second optical film was laminated on it, except that it was obtained by the same method as in Example 1 A polarizing film (multilayer optical film) with transparent protective films on both sides of the polarizer.

The polarizing films obtained in the foregoing Examples and Comparative Examples were evaluated as follows. The evaluation results are shown in Table 2.

<Adhesive force>

The polarizing film obtained in each example was cut into a size of 200 mm parallel to the extension direction of the polarizer and 20 mm in the vertical direction, and a cutter was cut between the transparent protective film and the polarizer, and the polarizing film was attached to the glass plate. The peel strength was measured by peeling the transparent protective film and the polarizer by Tensilon at a peeling speed of 500 mm/min in a 90-degree direction. In addition, the infrared absorption spectrum of the peeled surface after peeling was measured by the ATR method, and the peeled interface was evaluated based on the following criteria.

A: Cohesive destruction of transparent protective film

B: The interface between the transparent protective film/adhesive layer is peeled off

C: The interface between the adhesive layer/polarizer is peeled off

D: Cohesive destruction of polarized parts

In the aforementioned criteria, A and D have excellent adhesion because the adhesion is greater than or equal to the cohesive strength of the film. On the other hand, B and C mean that the adhesive force at the interface of the transparent protective film/adhesive layer (adhesive layer/polarizer) is insufficient (poor adhesive force). Considering this, set the adhesive force in A or D to ○, A. B (At the same time, "the cohesive failure of the transparent protective film" and "the interface between the transparent protective film/adhesive layer are peeled off") or A. C (simultaneously produce "transparent protective film cohesive failure" and "interface peeling between adhesive layer/polarizer") adhesive force is set to △, B or C adhesive force is set to ×.

1‧‧‧Polarizer

2‧‧‧Transparent protective film

3‧‧‧Adhesive layer

Claims (9)

A method for manufacturing a laminated optical film, the laminated optical film is formed by curing an active energy ray-curable adhesive composition through an adhesive layer formed by laminating at least a first optical film and a second optical film, characterized by : In the laminated optical film, the polarizing film is located between the first optical film and the second optical film; the thickness of the adhesive layer is 0.1~3μm; the active energy ray curable adhesive composition contains at least two different types The active energy ray curable adhesive composition includes a first active energy ray curable adhesive composition and a second active energy ray curable adhesive composition; the manufacturing method of the laminated optical film includes the following steps: a coating step, Apply the first active energy ray-curing adhesive composition to the bonding surface of the first optical film, and apply the second active energy ray-curing adhesive composition to the bonding surface of the second optical film ; The bonding step, bonding the first optical film and the second optical film; and the next step, the first optical film and the second optical film are connected through the adhesive layer, the adhesive layer is free from The first optical film surface side or the second optical film surface side is irradiated with active energy rays to harden the active energy ray-curable adhesive composition; and the first active layer is arranged on the first optical film side The energy ray hardening adhesive composition contains component A with logPow of -1 to 1, and is placed in front The second active energy ray curable adhesive composition on the second optical film side contains component B with a logPow of 2-7. A method for manufacturing a laminated optical film, the laminated optical film is formed by curing an active energy ray-curable adhesive composition through an adhesive layer formed by laminating at least a first optical film and a second optical film, characterized by : In the laminated optical film, the polarizing film is located between the first optical film and the second optical film; the thickness of the adhesive layer is 0.1~3μm; the active energy ray curable adhesive composition contains at least two different types The active energy ray curable adhesive composition includes a first active energy ray curable adhesive composition and a second active energy ray curable adhesive composition; the manufacturing method of the laminated optical film includes the following steps: a coating step, Apply the first active energy ray-curable adhesive composition on the bonding surface of the first optical film, and further surface the coating surface on which the first active energy ray-curable adhesive composition has been applied The second active energy ray-curable adhesive composition is applied; in the bonding step, the second active energy ray-curable adhesive composition coated on the first optical film is attached to the second Optical film; and the next step, the first optical film and the second optical film are connected through the adhesive layer, the adhesive layer is activated by irradiating the first optical film surface side or the second optical film surface side Energy line to make the front The active energy ray curable adhesive composition is formed by curing; and, the first active energy ray curable adhesive composition disposed on the first optical film side contains component A with a logPow of -1 to 1, and is provided The second active energy ray-curable adhesive composition on the second optical film side contains component B with a logPow of 2-7. The method for manufacturing a laminated optical film according to claim 2, wherein the liquid viscosity of the first active energy ray-curable adhesive composition is higher than the liquid viscosity of the second active energy ray-curable adhesive composition. The method for manufacturing a laminated optical film according to claim 1 or 2, wherein the contact angle of the active energy ray curable adhesive composition to the first optical film and the second optical film is 5-50 degrees. The method for manufacturing a laminated optical film according to claim 1 or 2, wherein the first optical film and the second optical film are selected from polyvinyl alcohol-based polarizers, acrylic resin films, cycloolefin resin films, and polyester resins. At least one optical film in the group consisting of film and polyolefin resin film. The method for manufacturing a laminated optical film according to claim 5, wherein the first optical film and the second optical film are selected from the acrylic resin film, the cycloolefin resin film, the polyester resin film, and the polyolefin resin At least one optical film in the group formed by the film. The method for manufacturing a laminated optical film according to claim 5, wherein the acrylic resin film, the cycloolefin resin film, the polyester resin film, and the polyolefin resin film are formed with an easy-adhesive layer on their bonding surfaces, and the easy The next layer contains selected from acrylic resin, polyurethane resin, polyvinyl alcohol resin, melamine resin and containing

At least one resin in the group consisting of oxazoline-based resins. The method for manufacturing a laminated optical film according to claim 6, wherein the active energy ray-curable adhesive composition contains 25 to 98% by weight of radical polymerizability with an SP value of 18 to 21 (MJ/m ³ ) ^1/2 Compound. The method for manufacturing a laminated optical film according to claim 1 or 2, wherein the polarizing film at least has a polarizing member.

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