JPWO2014185318A1 - Image display device - Google Patents

Abstract

Provided is an image display device having a polarizing plate with good adhesion between a polarizer and a polarizer protective film with high productivity while suppressing deterioration of ultraviolet rays such as a color filter, a dye, and a liquid crystal compound. An image display device having an image display cell and a polarizing plate located on the viewing side of the image display cell, wherein the polarizing plate has a polarizer protective film laminated on both sides of the polarizer, At least one is laminated | stacked with the polarizer through the active energy ray hardening adhesive, and has an ultraviolet absorptive adhesive layer in the visual recognition side rather than an image display cell, The image display apparatus characterized by the above-mentioned.

Description

  The present invention relates to an image display device.

  For image display cells of image display devices such as liquid crystal displays (LCD) and organic electroluminescence (organic EL) displays, color filters and pigments are used for color display. The compound is easily deteriorated by ultraviolet rays contained in sunlight or fluorescent lamps, and the color tone may change with time. In order to prevent this, generally, an ultraviolet absorbing function is imparted to a polarizing plate disposed on the viewing side from the image display cell. In order to impart an ultraviolet absorbing function to the polarizing plate, a method of adding an ultraviolet absorber to the polarizer protective film of the polarizing plate, and a method of adding an ultraviolet absorber to the adhesive that bonds the polarizer and the polarizer protective film (Patent Document 1) is adopted.

  Conventionally, a water-based adhesive has been used for bonding a polarizer and a polarizer protective film. Recently, an active energy ray-curable adhesive has been proposed (Patent Document 2), and has attracted attention from the viewpoint of productivity. ing. However, when a film containing an ultraviolet absorber is used as the polarizer protective film, the single-sided polarizer protective film is a film that does not contain an ultraviolet absorber, and ultraviolet rays are irradiated only from the film surface that does not contain the ultraviolet absorber. It is necessary to cure the adhesive. However, when the ultraviolet rays are irradiated in such a manner, the light amount of the adhesive layer opposite to the irradiation surface of the ultraviolet rays is halved by the polarizer, so that it is necessary to irradiate excessive ultraviolet rays in order to sufficiently cure. Further, when an ultraviolet absorber is added to the active energy ray-curable adhesive, there is a problem that it is difficult to sufficiently cure.

JP-A-61-88204 JP 2004-245925 A

  An object of the present invention is to solve the above problems and to provide an image display device with high productivity.

The typical present invention is an invention according to the following items 1 to 5.
Item 1.
An image display device having an image display cell and a polarizing plate positioned on the viewing side of the image display cell, wherein the polarizing plate has a polarizer protective film laminated on both sides of the polarizer, At least one is laminated | stacked with the polarizer through the active energy ray hardening adhesive, and has an ultraviolet absorptive adhesive layer in the visual recognition side rather than an image display cell, The image display apparatus characterized by the above-mentioned.
Item 2.
Item 2. The image display device according to Item 1, wherein at least one of the polarizer protective films is a low moisture-permeable film.
Item 3.
Item 3. The image display device according to Item 1 or 2, wherein at least one of the polarizer protective films has a retardation of 3000 to 150,000 nm.
Item 4.
Item 4. The image display device according to any one of Items 1 to 3, wherein the image display cell is a liquid crystal cell.
Item 5.
Item 5. The image display device according to any one of Items 1 to 4, wherein the image display cell and the polarizing plate are laminated via an ultraviolet absorbing adhesive layer.

  According to the image display device of the present invention, since it has an ultraviolet-absorbing adhesive layer separately from the polarizing plate, adhesion between the polarizer and the polarizer protective film while suppressing UV degradation of color filters, pigments, liquid crystal compounds, etc. An image display device having a polarizing plate with good productivity can be provided with high productivity.

It is a schematic diagram which shows displays, such as a television and a computer. It is a schematic diagram which shows touchscreen integrated liquid crystal panels, such as a smart phone and a tablet computer. It is a schematic diagram which shows liquid crystal cell touch panel separated types, such as a smart phone and a tablet computer.

  The image display device of the present invention has an image display cell and a polarizing plate located on the viewer side of the image display cell, and the polarizing plate has a polarizer protective film laminated on both sides of the polarizer. At least one of the protective films is laminated with a polarizer via an active energy ray-curable adhesive, and has a UV-absorbing pressure-sensitive adhesive layer on the viewing side with respect to the image display cell.

1. Image Display Cell In the present invention, an image display cell is a part that emits or modulates light for displaying an image. Specific examples include a liquid crystal cell in which a liquid crystal compound is sealed between two substrates having electrodes and the like, an organic EL cell in which an organic dye is laminated on an electrode, and the like.

2. Polarizing plate and polarizer protective film Generally, a liquid crystal display has polarizing plates on both sides of an image display cell. In this case, the viewing side polarizing plate is referred to as a viewing side polarizing plate, and the light source side polarizing plate is referred to as a light source side polarizing plate. Moreover, in an organic EL display, in order that external light may reduce the reflection by reflection of the electrode of an organic EL cell, it has a polarizing plate on the visual recognition side normally from an organic EL cell.

  The polarizing plate has a structure in which both sides of a film-like polarizer are sandwiched between two protective films (referred to as “polarizer protective film”). As the polarizer, any polarizer (or polarizing film) used in the technical field can be appropriately selected and used. Representative polarizers include those obtained by dyeing a dichroic material such as iodine on a polyvinyl alcohol (PVA) film or the like, but are not limited to this, and are known and will be developed in the future. A polarizer to be obtained can be appropriately selected and used.

  Commercially available products can be used as the PVA film. For example, “Kuraray Vinylon (manufactured by Kuraray Co., Ltd.)”, “Tocero Vinylon (manufactured by Toh Cello Co., Ltd.)”, “Nippon Synthetic Chemical Co., Ltd.” Can be used. Examples of the dichroic material include iodine, a diazo compound, and a polymethine dye.

  The polarizer can be obtained by any method. For example, a PVA film dyed with a dichroic material is uniaxially stretched in an aqueous boric acid solution, and washed and dried while maintaining the stretched state. Can be obtained. The stretching ratio of uniaxial stretching is usually about 4 to 8 times, but is not particularly limited. Other manufacturing conditions and the like can be appropriately set according to known methods.

  In this document, the protective film on the viewing side of the polarizer (referred to as “viewing side polarizer”) of the polarizing plate located on the viewing side from the image display cell is referred to as “viewing side polarizer protective film of viewing side polarizer”. . The protective film on the light source side of the viewing side polarizer is referred to as “light source side polarizer protective film of the viewing side polarizer”.

  The type of the viewing side polarizer protective film of the viewing side polarizer is arbitrary, and a film conventionally used as a protective film can be appropriately selected and used. For example, polyester (for example, polyethylene terephthalate, polyethylene naphthalate, etc.) film, polycarbonate film, polystyrene film, triacetyl cellulose (TAC) film, acrylic film, and cyclic olefin film (for example, norbornene film), polypropylene film, And polyolefin film (for example, TPX).

  The kind of the light source side polarizer protective film of the viewing side polarizer and the type of the protective film of the light source side polarizer is arbitrary, and a film conventionally used as a protective film can be appropriately selected and used. From the viewpoint of handling and availability, for example, a triacetyl cellulose (TAC) film, an acrylic film, a cyclic olefin-based film (for example, a norbornene-based film), a polypropylene film, a polyolefin-based film (for example, TPX), etc. It is preferable to use one or more films selected from the group consisting of:

  In one embodiment, the light source side polarizer protective film of the viewing side polarizer is preferably an optical compensation film having an optical compensation function. Such an optical compensation film can be appropriately selected according to each type of liquid crystal. For example, a liquid crystal compound (for example, a discotic liquid crystal compound and / or a birefringent compound) is dispersed in triacetyl cellulose. 1 selected from the group consisting of resin, cyclic olefin resin (for example, norbornene resin), propionyl acetate resin, polycarbonate film resin, acrylic resin, styrene acrylonitrile copolymer resin, lactone ring-containing resin, and imide group-containing polyolefin resin. What can be obtained from more than a seed can be mentioned.

  Since the optical compensation film is commercially available, they can be appropriately selected and used. For example, “Wideview-EA” and “Wideview-T” (made by Fujifilm) for TN system, “Wideview-B” (made by Fujifilm) for VA system, VA-TAC (Konica Minolta, Inc.) ), “ZEONOR FILM” (manufactured by ZEON CORPORATION), “ARTON” (manufactured by JSR), “X-plate” (manufactured by Nitto Denko), and “Z-TAC” (manufactured by FUJIFILM Corporation) for the IPS system ), “CIG” (manufactured by Nitto Denko Corporation), “P-TAC” (manufactured by Okura Kogyo Co., Ltd.), and the like.

  The thickness of the polarizer protective film is arbitrary, and can be appropriately set, for example, in the range of 15 to 300 μm, preferably in the range of 30 to 200 μm.

  When at least one of the viewer side polarizer protective film of the viewer side polarizer and the light source side polarizer protective film of the viewer side polarizer is a low moisture-permeable film, the active energy ray-curable adhesive having no volatile component Is often used, and is a preferred form for applying the present invention. Among them, the viewing-side polarizer protective film of the viewing-side polarizer is preferably a low moisture-permeable film because warpage at high temperature and high humidity and a decrease in polarizer function can be suppressed.

The low moisture permeability film has a water vapor permeability of 150 g / m ² · 24 hr or less, preferably 100 g / m ² · 24 hr or less, more preferably 50 g / m ² · when measured according to JIS-K7129 B method. It is a film of 24 hours or less.

  Examples of the material of the low moisture permeability film include polyester resin, polycarbonate resin, polystyrene resin, syndiotactic polystyrene resin, polyether ether ketone resin, polyphenylene sulfide resin, and cycloolefin resin. Moreover, even if it is a moisture-permeable film, what laminated | stacked metal oxide thin films, such as a silicon oxide, aluminum oxide, and these mixtures, is mentioned as an example of a low moisture-permeable film.

  In order to ensure the curability of the active energy ray-curable adhesive, the polarizer protective film preferably does not contain an ultraviolet absorber. In particular, it is preferable that the polarizer protective film on the side to be bonded to the polarizer using an active energy ray-curable adhesive does not contain an ultraviolet absorber.

(High retardation alignment film)
The viewing side polarizer protective film of the viewing side polarizer may be a film having no birefringence (for example, retardation is 150 nm or less), but is a film having a retardation of 3000 nm to 150,000 nm (high retardation alignment film). It is one of the preferred embodiments of the present invention.

  The lower limit value of the retardation of the high retardation oriented film is preferably 4500 nm or more, preferably 6000 nm or more, preferably 8000 nm or more, preferably 10,000 nm or more. On the other hand, the upper limit of the retardation of the high retardation oriented film is that a further improvement effect of visibility is not substantially obtained even if a film having a retardation higher than that is used, and the oriented film depends on the height of the retardation. However, the thickness is set to 150,000 nm from the viewpoint that it may be contrary to the demand for thinning, but it can be set to a higher value. When the image display device has two or more high retardation alignment films, the retardations may be the same or different.

  The retardation value of the film can be determined by measuring the biaxial refractive index and thickness according to a known method. For example, it can also be measured using a commercially available automatic birefringence measuring device such as KOBRA-21ADH (Oji Scientific Instruments). In any measurement method, retardation at 589 nm, which is the wavelength of sodium D-line, is measured.

  From the standpoint of more effectively suppressing rainbow spots, the high retardation oriented film has a ratio (Re / Rth) of the retardation (Re) and thickness direction retardation (Rth) of preferably 0.2 or more, Preferably it is 0.5 or more, preferably 0.6 or more. Thickness direction retardation means an average value of retardation obtained by multiplying two birefringences ΔNxz and ΔNyz, respectively, when viewed from the cross section in the film thickness direction, with the film thickness d. As Re / Rth is larger, the birefringence action is more isotropic, and the generation of rainbow spots on the screen can be more effectively suppressed. In this document, when simply described as “retardation”, it means in-plane retardation.

  The maximum value of Re / Rth is 2.0 (that is, a perfect uniaxial symmetry film), but the mechanical strength in the direction perpendicular to the orientation direction tends to decrease as the perfect uniaxial symmetry film is approached. is there. Therefore, the upper limit of Re / Rth of the polyester film is preferably 1.2 or less, and preferably 1.0 or less. Even if the ratio is 1.0 or less, it is possible to satisfy the viewing angle characteristics (180 degrees left and right, 120 degrees up and down) required for the image display device.

(Method for producing high retardation oriented film)
The high retardation alignment film can be produced by appropriately selecting a known method. For example, high retardation alignment films include polyester resins, polycarbonate resins, polystyrene resins, syndiotactic polystyrene resins, polyether ether ketone resins, polyphenylene sulfide resins, cycloolefin resins, liquid crystalline polymer resins, and cellulosic resins. It can be produced using one or more selected from the group consisting of added resins. Therefore, high retardation alignment film is a polyester film, polycarbonate film, polystyrene film, syndiotactic polystyrene film, polyetheretherketone film, polyphenylene sulfide film, cycloolefin film, liquid crystalline film, and liquid crystal compound added to cellulose resin. Film.

  Liquid crystalline polymer compounds having many aromatic structures in the molecular chain, liquid crystalline low molecular compounds, low molecular condensed polycyclic compounds (for example, naphthalene compounds), wholly aromatic polyesters, etc. It is also possible to ensure a predetermined retardation by mixing the polymer or oligomer and stretching the film.

  Preferred raw material resins for the high retardation oriented film are polycarbonate, syndiotactic polystyrene, and polyester. These resins are excellent in transparency and excellent in thermal and mechanical properties, and the retardation can be easily controlled by stretching. Polyesters typified by polyethylene terephthalate and polyethylene naphthalate are preferable because they have a large intrinsic birefringence, and relatively large retardation can be obtained even when the film thickness is thin. In particular, polyethylene naphthalate has a large intrinsic birefringence among polyesters, and therefore is suitable for a case where it is desired to make the retardation particularly high or a case where it is desired to reduce the film thickness while keeping the retardation high.

(Manufacturing method of high retardation oriented film made of polyester)
Below, the manufacturing method of a highly retardation orientation film is demonstrated to a polyester film as an example. The polyester film can be obtained by condensing an arbitrary dicarboxylic acid and a diol. Examples of the dicarboxylic acid include terephthalic acid, isophthalic acid, orthophthalic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, and diphenylcarboxylic acid. Acid, diphenoxyethanedicarboxylic acid, diphenylsulfonecarboxylic acid, anthracenedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, hexahydroterephthalic acid, hexahydroisophthalate Acid, malonic acid, dimethylmalonic acid, succinic acid, 3,3-diethylsuccinic acid, glutaric acid, 2,2-dimethylglutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, azelaic acid, Dimer , It may be mentioned sebacic acid, suberic acid, dodecamethylene dicarboxylic acid.

  Examples of the diol include ethylene glycol, propylene glycol, hexamethylene glycol, neopentyl glycol, 1,2-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, decamethylene glycol, 1,3-propanediol, 1,4 -Butanediol, 1,5-pentanediol, 1,6-hexadiol, 2,2-bis (4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) sulfone and the like can be mentioned.

  Each of the dicarboxylic acid component and the diol component constituting the polyester film may be used alone or in combination of two or more. Specific polyester resins constituting the polyester film include, for example, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc., preferably polyethylene terephthalate and polyethylene naphthalate, more preferably polyethylene terephthalate. is there. The polyester resin may contain other copolymer components, and from the viewpoint of mechanical strength, the proportion of the copolymer components is preferably 3 mol% or less, more preferably 2 mol% or less, still more preferably 1.5 mol% or less. is there. These resins are excellent in transparency and excellent in thermal and mechanical properties. Moreover, retardation of these resins can be easily controlled by stretching.

  The intrinsic viscosity of the polyester is preferably 0.5 or more, and preferably from 0.6 dl / g or more, more preferably 0.65 dl / g or more, from the viewpoint of film formation stability, rupture resistance, and the like. Preferably it is 0.7 dl / g or more. In particular, it is preferable that the intrinsic viscosity is high from the viewpoint of increasing the mechanical strength of the film while reducing the film thickness. On the other hand, if the intrinsic viscosity is high, problems such as extrudability may occur, so 1.0 dl / g or less is preferable, and 0.9 dl / g or less is more preferable.

  The polyester film can be obtained according to a general production method. Specifically, the polyester resin is melted and the non-oriented polyester extruded and formed into a sheet shape is stretched in the longitudinal direction by utilizing the speed difference of the roll at a temperature equal to or higher than the glass transition temperature, and then in the transverse direction by a tenter. An oriented polyester film can be obtained by stretching and heat treatment. The polyester film may be a uniaxially stretched film or a biaxially stretched film.

  Manufacturing conditions for obtaining a polyester film can be appropriately set according to a known method. For example, the longitudinal stretching temperature and the transverse stretching temperature are usually 80 to 130 ° C, preferably 90 to 120 ° C. The longitudinal draw ratio is usually 1.0 to 3.5 times, preferably 1.0 to 3.0 times. The transverse draw ratio is usually 2.5 to 6.0 times, preferably 3.0 to 5.5 times.

  Controlling the retardation within a specific range can be performed by appropriately setting the stretching ratio, stretching temperature, and film thickness. For example, it becomes easier to obtain a higher retardation as the stretching ratio between the longitudinal stretching and the lateral stretching is higher, the stretching temperature is lower, and the film is thicker. On the contrary, it becomes easier to obtain a lower retardation as the stretching ratio between the longitudinal stretching and the lateral stretching is lower, the stretching temperature is higher, and the film thickness is thinner. Moreover, the higher the stretching temperature and the lower the total stretching ratio, the easier it is to obtain a film having a lower ratio of retardation to thickness direction (Re / Rth). Conversely, a film having a higher ratio of retardation to thickness direction retardation (Re / Rth) can be obtained as the stretching temperature is lower and the total stretching ratio is higher. Furthermore, the heat treatment temperature is usually preferably 140 to 240 ° C, more preferably 180 to 240 ° C.

  In order to suppress the fluctuation of the retardation in the polyester film, it is preferable that the thickness unevenness of the film is small. If the longitudinal stretching ratio is lowered to make a retardation difference, the value of the longitudinal thickness unevenness may be increased. Since there is a region where the value of the vertical thickness unevenness becomes very high in a specific range of the draw ratio, it is desirable to set the film forming conditions so as to exclude such a range.

The thickness unevenness of the oriented polyester film is preferably 5.0% or less, more preferably 4.5% or less, still more preferably 4.0% or less, and 3.0% or less. It is particularly preferred. The thickness unevenness of the film can be measured by any means. For example, a tape-like sample (length: 3 m) continuous in the film flow direction is collected and 100 cm at a 1 cm pitch using a commercially available measuring instrument (for example, an electronic micrometer, Millitron 1240 manufactured by Seiko EM Co., Ltd.). The thickness of the point is measured, the maximum value (dmax), the minimum value (dmin), and the average value (d) of the thickness are obtained, and the thickness unevenness (%) can be calculated by the following formula.
Thickness unevenness (%) = ((dmax−dmin) / d) × 100

  When the viewing side polarizer protective film of the viewing side polarizer is a high retardation oriented film, the angle formed by the main orientation axis of the high retardation orientation film and the polarizing axis of the viewing side polarizer (the high retardation oriented film and the polarizer) Are assumed to be on the same plane). It is preferably about 0 degree or about 90 degrees in that it can be produced using a conventional stretching machine as it is. Further, when the image is observed through polarized sunglasses, approximately 45 degrees is preferable from the viewpoint that the color shift and the disappearance of the image can be eliminated. The term “substantially” as used herein means that the allowable range is preferably ± 20 degrees or less, more preferably 15 degrees or less, particularly preferably ± 10 degrees or less, and most preferably ± 7 degrees or less.

(Easily adhesive layer)
The polarizer protective film is preferably provided with an easy-adhesion layer from the viewpoint of improving adhesiveness with the adhesive layer. For example, when the polarizer protective film is a polyester film, the easy-adhesion layer preferably includes at least one of a polyester resin, a polyurethane resin, or a polyacrylic resin as a main component. Here, the “main component” is a component that is 50% by weight or more of the solid components constituting the easy-adhesion layer. If necessary, a crosslinking agent, an organic or inorganic filler, a surfactant, a lubricant, and the like can be contained. The coating solution used for forming the easy-adhesion layer is preferably an aqueous coating solution containing at least one of a water-soluble or water-dispersible copolymerized polyester resin, an acrylic resin, and a polyurethane resin.

  The polarizer protective film may have various functional layers on the surface opposite to the surface on which the polarizer is laminated. Examples of such a functional layer include a hard coat layer, an antiglare layer, an antireflection layer, a low reflection layer, a low reflection antiglare layer, an antireflection antiglare layer, an antistatic layer, a silicone layer, an adhesive layer, and an antifouling layer. One or more selected from the group consisting of a layer, a fingerprint-resistant layer, a water-repellent layer, a blue cut layer, and the like can be used. Also in this case, it is preferable to provide an easy adhesion layer that improves the adhesion to the functional layer.

3. Active energy ray curable adhesive The polarizing plate has a structure in which a polarizer protective film is laminated on both sides of the polarizer, and at least one polarizer protective film is laminated with the polarizer via an active energy ray curable adhesive. It is preferred that By using the active energy ray-curable composition (or adhesive), it is possible to adhere even when a low moisture-permeable film is used, and to improve the adhesion. Furthermore, environmental resistance such as wet heat resistance of the polarizing plate can be improved. In particular, by using a solventless active energy ray-curable resin composition, the step of drying the adhesive becomes unnecessary, and thus productivity can be improved.

  As the active energy ray-curable compound contained in the active energy ray-curable composition, conventionally known compounds can be used. Specifically, in addition to the epoxy compound and the oxetane compound, a radical polymerizable monomer such as a (meth) acrylate compound can be used.

(Epoxy compounds and oxetane compounds)
Epoxy compounds include alicyclic epoxy compounds, glycidyl etherified products of aromatic compounds and chain compounds having a hydroxyl group, glycidyl aminated products of compounds having an amino group, and epoxy compounds of chain compounds having a CC double bond. And the like.

  Here, the alicyclic epoxy compound means one having an epoxy group directly in the ring of the saturated cyclic compound and one having a glycidyl ether group or glycidyl group directly in the ring of the saturated cyclic compound. In addition, the compound which has another epoxy group in a structure may be sufficient.

  An alicyclic epoxy compound having an epoxy group directly on the ring of a saturated cyclic compound is, for example, a C—C double bond of a cyclic compound having a C—C double bond in the ring, using a peroxide. And obtained by epoxidation under basic conditions.

  The cyclic compound having a C—C double bond in the ring is not particularly limited, and examples thereof include a compound having a cyclopentene ring, a compound having a cyclohexene ring, and a polycyclic compound thereof. The cyclic compound having a C—C double bond in the ring may have a C—C double bond outside the ring. Examples of such a compound include 1-vinyl-3-cyclohexene and monocyclic ring. Examples include limonene, which is a formula monoterpene.

  Further, the alicyclic epoxy compound having an epoxy group directly on the ring of the saturated cyclic compound may be a compound having a structure obtained by dimerizing the epoxidized product obtained above through an appropriate functional group. The bond structure composed of the functional group is not particularly limited, and examples thereof include an ester bond, an ether bond, and a bond by an alkyl group. The dimerized structure of the epoxidized product may have a plurality of these bonds.

  The method for producing an alicyclic epoxy compound having an epoxy group directly on the ring of the saturated cyclic compound varies depending on the individual compound and is not particularly limited. After synthesizing a cyclic compound having a heavy bond in the ring, a method of epoxidizing, and a compound in which a C—C double bond is epoxidized are further reacted with a functional group as described above to obtain a target structure. A synthesis method or the like is employed. From the viewpoint of suppressing side reactions of epoxy groups and the like, usually, a method of epoxidizing after synthesizing a cyclic compound having a C—C double bond in the ring is preferably employed.

  The synthesis of a cyclic compound having a C—C double bond in the ring varies depending on the skeleton of the target epoxy compound and is not particularly limited. As a synthesis example of a dimerized cyclic compound, For example, a method for obtaining 3-cyclohexenylmethyl-3-cyclohexenecarboxylate, which is an ester compound, from 3-cyclohexene-1-carboxaldehyde by a Tishchenko reaction using an appropriate catalyst can be mentioned.

  Further, the ester compound and a dicarboxylic acid compound or an ester thereof, a diol compound or an ester thereof, a polyalkylene glycol or an ester thereof, or a hydroxycarboxylic acid compound or an ester thereof, if necessary, are subjected to an ester exchange reaction. By doing so, a compound having a cyclohexenyl group at both ends is obtained.

  Examples of dicarboxylic acid compounds and esters thereof include oxalic acid, adipic acid, sebacic acid, and dimethyl esters thereof. Examples of the diol compound and its ester include ethylene glycol, diethylene glycol, 1,2-propanediol, polyethylene glycol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, and dimethyl esters thereof. Can be mentioned. Examples of hydroxycarboxylic acid compounds and esters thereof include lactic acid, 3-hydroxybutyric acid, and citric acid, and dimethyl esters and acetates thereof, and lactide, propiolactone, butyrolactone, and caprolactone. .

  An alicyclic epoxy compound having an epoxy group directly in the ring of the saturated cyclic compound is obtained by epoxidizing the cyclic compound having the C—C double bond thus obtained with a peroxide. be able to. The peroxide is selected according to the individual cyclic compound and acceptable reaction conditions, and is not particularly limited. For example, hydrogen peroxide, peracetic acid, and t-butyl hydroperoxide are used. Etc.

  Specific examples of the alicyclic epoxy compound having an epoxy group directly on the ring of the saturated cyclic compound include, for example, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, 1,2-epoxy- 4-vinylcyclohexane, 1,2-epoxy-1-methyl-4- (1-methylepoxyethyl) cyclohexane, 3,4-epoxycyclohexylmethyl methacrylate, 2,2-bis (hydroxymethyl) -1-butanol 4- (1,2-epoxyethyl) -1,2-epoxycyclohexane adduct, ethylene bis (3,4-epoxycyclohexanecarboxylate), oxydiethylene bis (3,4-epoxycyclohexanecarboxylate), 1,4 -Cyclohexanedimethyl bis (3,4-epoxy Xylcyclohexanecarboxylate), 3- (3,4-epoxycyclohexylmethoxycarbonyl) propyl 3,4-epoxycyclohexanecarboxylate, and the like.

  An alicyclic epoxy compound having a glycidyl ether group or a glycidyl group directly on the ring of a saturated cyclic compound means that an aromatic ring of an aromatic compound having a hydroxyl group, which will be described later, is pressed under pressure in the presence of a catalyst. A compound obtained by selectively performing a hydrogenation reaction, a glycidyl etherified product of a saturated cyclic compound having a hydroxyl group, and an epoxidized product of a saturated cyclic compound having a vinyl group.

  The glycidyl etherified product of an aromatic compound having a hydroxyl group to be hydrogenated is not particularly limited, and examples thereof include glycidyl etherified products of bisphenol A and oligomers thereof, and glycidyl etherified products of bisphenol F and oligomers thereof. Examples include the body.

  The glycidyl etherified product of a saturated cyclic compound having a hydroxyl group is not particularly limited, and examples thereof include 1,4-cyclohexanedimethanol diglycidyl ether.

  The epoxidized product of the saturated cyclic compound having a vinyl group is not particularly limited. For example, 1,3-bis (epoxyethyl) hexane, 1,2,4-tris (epoxyethyl) hexane, and 2 , 4-bis (epoxyethyl) -1-vinylcyclohexane and the like.

  Among the alicyclic epoxy compounds described above, 3,4-epoxy has good cured product characteristics for improving the durability of the polarizing plate, or has moderate curability and is available at a relatively low price. A hydrogenated product of cyclohexylmethyl 3,4-epoxycyclohexanecarboxylate and a glycidyl etherified product of bisphenol A is preferable, and 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate is more preferable.

  These alicyclic epoxy compounds may be used alone or in combination of two or more.

  The hue of the active energy ray-curable composition containing the alicyclic epoxy compound is preferably 5 or less, more preferably 3 or less, and even more preferably 1 or less in terms of Gardner chromaticity of the active energy ray-curable composition before curing. When the hue exceeds 5, the hue of the polarizing plate may be affected by the coloring of the adhesive layer.

  The glycidyl etherified product of an aromatic compound and a chain compound having a hydroxyl group is obtained by addition condensation of a compound such as epichlorohydrin to the hydroxyl group under alkaline conditions. Examples thereof include bisphenol type epoxy resins, polyaromatic ring type epoxy resins, and alkylene glycol type epoxy resins.

  Examples of the bisphenol type epoxy resin include glycidyl etherified products of bisphenol A and oligomers thereof, glycidyl etherified products of bisphenol F and oligomers thereof, and 3,3 ′, 5,5′-methyl-4,4′-biphenol. Glycidyl etherified products and oligomers thereof.

  Examples of the polyaromatic epoxy resin include glycidyl etherified products of phenol novolac resins, glycidyl etherified products of cresol novolac resins, glycidyl etherified products of phenol aralkyl resins, glycidyl etherified products of naphthol aralkyl resins, and phenol dicyclopentadiene. Examples thereof include glycidyl etherified products of resins. Furthermore, a glycidyl etherified product of trihydroxyphenylmethane and an oligomer thereof, and a glycidyl etherified product of trisphenol PA and an oligomer thereof are also included.

  Examples of the alkylene glycol type epoxy resin include glycidyl etherified product of ethylene glycol, glycidyl etherified product of diethylene glycol, glycidyl etherified product of 1,4-butanediol, and glycidyl etherified product of 1,6-hexanediol. It is done.

  The glycidyl aminated product of a compound having an amino group is obtained by addition condensation of a compound such as epichlorohydrin to the amino group under basic conditions. The compound having an amino group may have a hydroxyl group at the same time. For example, glycidyl amination product of 1,3-phenylenediamine and oligomer thereof, glycidyl amination product and oligomer of 1,4-phenylenediamine, glycidyl amination and glycidyl etherification product of 3-aminophenol and oligomer thereof And glycidyl amination and glycidyl etherification products of 4-aminophenol and oligomers thereof.

  An epoxidized product of a chain compound having a CC double bond is an epoxidation of a CC compound of a chain compound having a CC double bond under basic conditions using a peroxide. It is obtained by making it.

  The chain compound having a C—C double bond is not particularly limited, and examples thereof include butadiene, polybutadiene, isoprene, pentadiene, and hexadiene.

  These epoxy compounds and oligomers thereof may be used alone or in combination of two or more.

  Such epoxy compounds can be easily obtained as commercial products. For example, “Celoxide”, “Cyclomer” (manufactured by Daicel Chemical Industries, Ltd.) and “Syracure” Dow Chemical Co., Ltd., “Epicoat” (manufactured by Japan Epoxy Resin Co., Ltd.), “Epiclon” (manufactured by DIC Corporation), “Epototo” (manufactured by Toto Kasei Co., Ltd.), “Adeka Resin” (manufactured by ADEKA Corporation), “ “Denacol” (manufactured by Nagase ChemteX Corporation), “Dow Epoxy” (manufactured by Dow Chemical Company), “Tepic” (manufactured by Nissan Chemical Industries, Ltd.), and the like.

  The epoxy equivalent of the epoxy compound is usually 30 to 2000 g / eq, preferably 50 to 1500 g / eq, and more preferably 70 to 1000 g / eq. When the epoxy equivalent is less than 30 g / eq, the flexibility of the first adhesive layer may be lowered or the adhesive strength may be lowered. On the other hand, if it exceeds 2000 g / eq, the curing rate may decrease, or the rigidity and strength required for the cured adhesive layer may be insufficient. This epoxy equivalent is a value measured according to JIS K 7236 (ISO 3001). If the epoxy compound is a high purity monomer, the theoretical amount can be calculated from the molecular weight.

  The active energy ray-curable compound improves adhesion between a polarizing film and a stretched polyester film by using a plurality of epoxy compounds, for example, an alicyclic epoxy compound and an epoxy compound other than the alicyclic epoxy compound. Can be made.

  An oxetane compound can be used as the active energy ray-curable compound. The oxetane compound can improve the curing rate of the active energy ray-curable composition. The oxetane compound is a compound having an oxetane ring and is not particularly limited as long as it is active energy ray curable. For example, 1,4-bis {[(3-ethyloxetane-3-yl) Methoxy] methyl} benzene, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, bis (3-ethyl-3-oxetanylmethyl) ether, 3-ethyl-3- (phenoxymethyl) oxetane, 3-ethyl -3- (cyclohexyloxymethyl) oxetane, phenol novolac oxetane, 1,3-bis [(3-ethyloxetane-3-yl) methoxy] benzene, and the like.

  Such oxetane compounds can be easily obtained as commercial products. For example, “Aron Oxetane” (manufactured by Toagosei Co., Ltd.) and “ETERRNACOLL” (manufactured by Ube Industries, Ltd.) are available under the trade names. Etc.

  The active energy ray-curable composition containing an epoxy compound or an oxetane compound is preferably blended with a cationic polymerization initiator in order to be cured by active energy rays. The cationic polymerization initiator generates a cationic species or a Lewis acid by irradiation with active energy rays such as visible light, ultraviolet rays, X-rays, and electron beams, and initiates a polymerization reaction of an epoxy group and an oxetane.

  This cationic polymerization initiator is preferably provided with latency. By providing the potential, the pot life of the active energy ray-curable composition used in the present invention is prolonged, and the workability is also improved.

  The compound that generates a cation species or a Lewis acid upon irradiation with active energy rays is not particularly limited, and examples thereof include onium salts such as aromatic diazonium salts, aromatic iodonium salts, aromatic sulfonium salts, and iron. -An allene complex etc. can be mentioned.

  Examples of the aromatic diazonium salt include benzenediazonium hexafluoroantimonate, benzenediazonium hexafluorophosphate, and benzenediazonium hexafluoroborate.

  Examples of the aromatic iodonium salt include diphenyliodonium tetrakis (pentafluorophenyl) borate, diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, and di (4-nonylphenyl) iodonium hexafluorophosphate.

  Examples of the aromatic sulfonium salt include triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium tetrakis (pentafluorophenyl) borate, diphenyl [4- (phenylthio) phenyl] sulfonium hexafluoroantimonate, 4,4′-bis [diphenylsulfonio] diphenyl sulfide bishexafluorophosphate, 4,4′-bis [di (β-hydroxyethoxy) phenylsulfonio] diphenyl sulfide bishexafluoroantimonate, 4,4′-bis [Di (β-hydroxyethoxy) phenylsulfonio] diphenyl sulfide bishexafluorophosphate, 7- [di (p-toluyl) sulfoni ] -2-Isopropylthioxanthone hexafluoroantimonate, 7- [di (p-toluyl) sulfonio] -2-isopropylthioxanthone tetrakis (pentafluorophenyl) borate, 4-phenylcarbonyl-4'-diphenylsulfonio-diphenyl sulfide hexa Fluorophosphate, 4- (p-tert-butylphenylcarbonyl) -4'-diphenylsulfonio-diphenyl sulfide hexafluoroantimonate, and 4- (p-tert-butylphenylcarbonyl) -4'-di (p-toluyl) ) Sulfonio-diphenyl sulfide tetrakis (pentafluorophenyl) borate and the like.

  Examples of iron-allene complexes include xylene-cyclopentadienyl iron (II) hexafluoroantimonate, cumene-cyclopentadienyl iron (II) hexafluorophosphate, and xylene-cyclopentadienyl iron (II)- And tris (trifluoromethylsulfonyl) methanide.

  These cationic polymerization initiators may be used alone or in combination of two or more. Among them, aromatic sulfonium salts are particularly preferably used because they have ultraviolet absorption characteristics even in a wavelength region of 300 nm or more, and therefore can provide a cured layer having excellent curability and good mechanical strength and adhesive strength. .

  The compounding quantity of a cationic polymerization initiator is 0.5-20 weight part normally with respect to a total of 100 weight part of an active energy ray hardening compound, and 1-15 weight part is preferable. If the amount is less than 0.5 parts by weight, curing may be insufficient, and the mechanical strength and adhesive strength of the cured product layer may be reduced. On the other hand, when the amount exceeds 20 parts by weight, the ionic substance in the cured product layer is increased, so that the hygroscopic property of the cured product layer is increased, and the durability performance of the obtained polarizing plate may be lowered.

  These cationic polymerization initiators can be easily obtained from commercial products, for example, “Kayarad” (manufactured by Nippon Kayaku Co., Ltd.), “Syracure” (manufactured by Union Carbide), Photoacid generator “CPI” (manufactured by San Apro Co., Ltd.), photoacid generators “TAZ”, “BBI”, “DTS” (manufactured by Midori Chemical Co., Ltd.), “Adekaoptomer” (manufactured by ADEKA Corporation) And “RHODORSIL” (manufactured by Rhodia).

(Radically polymerizable monomers such as (meth) acrylate compounds)
Examples of the radical polymerizable monomer include acrylate compounds, methacrylate compounds (hereinafter also referred to as (meth) acrylates in the meaning including both acrylates and methacrylates), allyl urethane compounds, unsaturated polyester compounds, and styrene compounds. It is done. (Meth) acrylate is preferred because it is easily available and easy to handle. As (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, (poly) ester (meth) acrylate, (poly) ether (meth) acrylate, alcohol (meth) acrylate, other (meth) An acrylate is mentioned.

  The epoxy (meth) acrylate exemplified as the above (meth) acrylate compound is one type or two or more types of epoxy resin and acrylic acid or methacrylic acid (hereinafter also referred to as (meth) acrylic acid in the meaning of including both). And an ester compound. The ester-derived epoxy resin is not particularly limited, and has one or more epoxy groups in the molecule, such as aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, epoxy novolac resin, etc. Can be used.

  The urethane (meth) acrylate is a hydroxyl group containing an ester compound of (meth) acrylic acid and one or more (poly) ester polyols, (poly) ether polyols, polyols such as polyhydric alcohols, and the like ( (Meth) acrylates obtained by reacting (meth) acrylates with one or more (poly) isocyanate compounds; one or more (poly) ester polyols, (poly) ether polyols, many It is an ester compound having a urethane bond, such as (meth) acrylate obtained by reacting a polyol such as a monohydric alcohol, a hydroxyl group-containing (meth) acrylate and an isocyanate.

  Examples of the polyhydric alcohol for deriving the (poly) ester polyol include 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, triethylene glycol, neopentyl glycol, polyethylene glycol, and polypropylene. Examples include glycol, polybutylene glycol, trimethylolpropane, glycerin, pentaerythritol, and dipentaerythritol. Examples of the polycarboxylic acid from which the (poly) ester polyol is derived include adipic acid, terephthalic acid, phthalic anhydride, trimellitic acid, trimesic acid, and the like.

  Examples of the (poly) ether polyol include those obtained by adding an alkylene oxide such as ethylene oxide, propylene oxide, butylene oxide to the polyhydric alcohol described above. Examples of the (poly) isocyanate compound include monovalent or divalent isocyanates, and divalent or higher isocyanates are preferred.

  Divalent or higher isocyanates include 2,4- and / or 2,6-tolylene diisocyanate, diphenylmethane-4,4′-diisocyanate, p-phenylene diisocyanate, xylylene diisocyanate, 1,5-naphthylene diisocyanate, 3 , 3′-dimethyldiphenyl-4,4′-diisocyanate, dianisidine diisocyanate, tetramethylxylylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4′-diisocyanate, trans and / or cis-1,4-cyclohexane diisocyanate, Norbornene diisocyanate, 1,6-hexamethylene diisocyanate, 2,2,4 and / or (2,4,4) -trimethylhexamethylene diisocyanate, lysine Isocyanate, triphenylmethane triisocyanate, 1-methyl-benzol-2,4,6-triisocyanate, dimethyl triphenylmethane tetra isocyanate.

  The (poly) ester (meth) acrylate is an ester compound of (poly) ester having (one) or two or more hydroxyl groups in the molecule and (meth) acrylic acid. (Poly) ester having one or more hydroxyl groups in the molecule is an ester compound of one or more polyhydric alcohols and one or more monocarboxylic acids or polycarboxylic acids. Is mentioned.

  Examples of the polyhydric alcohol for deriving a (poly) ester having one or two or more hydroxyl groups in the molecule include those described above, and examples of the monocarboxylic acid include formic acid, acetic acid, and propionic acid. , Butyric acid, isobutyric acid, valeric acid, caproic acid, caprylic acid, 2-ethylhexanoic acid, benzoic acid and the like. Examples of the polycarboxylic acid include the same compounds as those described above.

  Moreover, (poly) ether (meth) acrylate is an ester compound of (poly) ether and (meth) acrylic acid having one or more hydroxyl groups in the molecule. (Poly) ether having 1 or 2 or more hydroxyl groups in the molecule, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, or one or more alkylene oxides added to polyhydric alcohol And the like obtained by doing so. Examples of the polyhydric alcohol and alkylene oxide include the same compounds as those described above. Specifically, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, ethylene oxide modified trimethylolpropane tri (meth) acrylate, propylene Examples thereof include oxide-modified trimethylolpropane tri (meth) acrylate and dipentaerythritol hexa (meth) acrylate.

  The (meth) acrylates of alcohols are ester compounds of alcohols (particularly aliphatic alcohols or aromatic alcohols) having one or more hydroxyl groups in the molecule and (meth) acrylates. For example, 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, isoamyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, isooctyl (meth) Acrylate, tetrahydrofurfuryl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, neopentyl glycol di (Meth) acrylate, 1,6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate and the like.

  Other acrylates include ε-caprolactone-modified dipentaerythritol hexa (meth) acrylate, fluorene derivative di (meth) acrylate, carbazole derivative di (meth) acrylate, and the like.

  The above radical polymerizable monomer can be used to adjust the curing rate. In addition, when using a radically polymerizable monomer, photoradical polymerization initiator is used at least.

  Examples of the photo radical polymerization initiator include ketone compounds such as acetophenone compounds, benzyl compounds, benzophenone compounds, and thioxanthone compounds.

  Examples of the acetophenone compound include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 4′-isopropyl-2-hydroxy-2-methylpropiophenone, 2-hydroxymethyl- 2-methylpropiophenone, 2,2-dimethoxy-1,2-diphenylethane-1-one, p-dimethylaminoacetophenone, P-tertiarybutyldichloroacetophenone, p-tertiarybutyltrichloroacetophenone, p-azidoben Salacetophenone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone-1, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) ) -Butanone-1, benzo , Benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether and the like. Examples of the benzyl compound include benzyl and anisyl. Examples of the benzophenone compound include Examples include benzophenone, methyl o-benzoylbenzoate, Michler's ketone, 4,4′-bisdiethylaminobenzophenone, 4,4′-dichlorobenzophenone, 4-benzoyl-4′-methyldiphenyl sulfide, and the thioxanthone compound includes , 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2-isopropylthioxanthone, 2,4-diethylthioxanthone and the like.

  These radical photopolymerization initiators can be used alone or in combination of two or more according to the desired performance, and preferably 0.05 to 10% by mass with respect to the radical polymerizable monomer. More preferably, it is blended in an amount of 0.1 to 10% by mass. When the blending amount of the radical photopolymerization initiator with respect to the radical polymerizable monomer is 0.05% by mass or more, the curing of the photocurable adhesive can be progressed more favorably, and when it is 10% by mass or less, the light The physical strength of the adhesive layer formed by curing the curable adhesive is good.

  The total amount of chlorine contained in the active energy ray-curable composition is preferably in the range of 0.1 ppm to 15000 ppm, more preferably in the range of 0.5 ppm to 2000 ppm, and still more preferably in the range of 1.0 to 1000 ppm. If the total amount of chlorine contained in the active energy ray-curable composition is less than 0.1 ppm, the curing rate of the composition may be extremely slow. On the other hand, if it exceeds 15000 ppm, the coating device may corrode or the metal parts of the liquid crystal panel may corrode due to the influence of chlorine. This total chlorine amount is a value measured in accordance with JIS K 7243-3 (ISO 21627-3).

  Examples of the active energy ray used include X-rays having a wavelength of 1 pm to 10 nm, ultraviolet rays having a wavelength of 10 to 400 nm, and visible rays having a wavelength of 400 to 800 nm. Among these, ultraviolet rays are preferably used in terms of ease of use, ease of adjustment of the active energy ray-curable composition and its stability, and its curing performance.

  The active energy ray-curable composition used in the present invention is a curable composition that is solidified (cured) by irradiation with active energy rays and gives an adhesive force to films that sandwich the cured product layer.

  Although the light source to be used is not particularly limited, for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a chemical lamp, a black light lamp, a microwave excitation mercury lamp, having a light emission distribution at a wavelength of 400 nm or less, And metal halide lamps.

The irradiation intensity is determined by the active energy ray-curable composition and the irradiation time, and is not particularly limited. For example, the irradiation intensity in the wavelength region effective for activating the initiator is 0.1. It is preferable that it is -1000mW / cm < ² >. When the light irradiation intensity to the active energy ray-curable composition is less than 0.1 mW / cm ² , the curing reaction time becomes long, that is, it does not cure unless a long irradiation time is applied, which is disadvantageous for improving productivity. There is a case. Moreover, when it exceeds 1000 mW / cm ² , yellowing of the active energy ray-curable composition or deterioration of the polarizing film is caused by heat radiated from the lamp and heat generation during polymerization of the active energy ray-curable composition. There is.

The irradiation time is determined by the active energy ray-curable composition and the irradiation intensity and is not particularly limited. For example, the integrated light amount expressed as the product of the irradiation intensity and the irradiation time is 10 to 5 It is preferably set to be 000 mJ / cm ² . When the integrated light quantity to the active energy ray-curable composition is less than 10 mJ / cm ² , the generation of active species derived from the initiator is not sufficient, and the resulting adhesive layer may be insufficiently cured. On the other hand, if it exceeds 5,000 mJ / cm ² , the irradiation time becomes very long, which may be disadvantageous for improving productivity.

  The active energy ray-curable composition used in the present invention can be used in combination with a photosensitizer as necessary. By using a photosensitizer, the reactivity is improved, and the mechanical strength and adhesive strength of the cured product layer can be improved.

  The photosensitizer is not particularly limited, and examples thereof include carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo and diazo compounds, halogen compounds, and photoreductive dyes. .

  Examples of the carbonyl compound include benzoin derivatives such as benzoin methyl ether, benzoin isopropyl ether, and α, α-dimethoxy-α-phenylacetophenone; anthracene compounds such as 9,10-dibutoxyanthracene; benzophenone, 2,4 Benzophenone derivatives such as -dichlorobenzophenone, methyl o-benzoylbenzoate, 4,4'-bis (dimethylamino) benzophenone, and 4,4'-bis (diethylamino) benzophenone; of 2-chloroanthraquinone and 2-methylanthraquinone Anthraquinone derivatives such as; acridone derivatives such as N-methylacridone and N-butylacridone; acetophenone derivatives such as α, α-diethoxyacetophenone; And fluorenone derivatives.

  Examples of the organic sulfur compound include thioxanthone derivatives such as 2-chlorothioxanthone and 2-isopropylthioxanthone. Other examples include benzyl compounds and uranyl compounds.

  The photosensitizers may be used alone or in combination. The photosensitizer is preferably contained in the range of 0.1 to 20 parts by weight when the active energy ray-curable composition is 100 parts by weight.

  Various additives can be blended with the active energy ray-curable composition used in the present invention as long as the effects of the present invention are not impaired. Examples of various additives include ion trapping agents, antioxidants, chain transfer agents, sensitizers, tackifiers, thermoplastic resins, fillers, flow regulators, plasticizers, and antifoaming agents. It is done.

  Examples of the ion trapping agent include inorganic compounds such as powdered bismuth-based, antimony-based, magnesium-based, aluminum-based, calcium-based, titanium-based, and mixed systems thereof. Examples of the antioxidant include hindered phenol antioxidants.

  Examples of the thermoplastic resin include acrylic resin, urethane resin, and polyester resin.

  Although the method of forming the layer (adhesive layer before hardening) which consists of the active energy ray curable composition shown above on a polarizing film or a polarizer protective film is not specifically limited, For example, a polarizing film Or the method of apply | coating this composition on a polarizer protective film, the method of spraying this composition, the method of bonding this composition previously formed in the film form, etc. are employ | adopted. Among them, the method of applying the composition or the method of pasting the film-like composition is preferable because of relatively high uniformity of the coating film, and the method of applying the composition is more highly productive. preferable.

  Although it does not specifically limit as a coating method, For example, various coating systems, such as a doctor blade, a wire bar, a die coater, a comma coater, and a gravure coater, are employ | adopted.

  The thickness of the applied adhesive layer before curing is usually 0.1 to 20 μm, preferably 0.2 to 10 μm, and more preferably 0.5 to 5 μm. When the thickness is less than 0.1 μm, the adhesion between the polarizing film and the polarizer protective film due to the cured adhesive layer may be insufficient. Further, if the thickness exceeds 20 μm, the curing of the adhesive layer may not proceed sufficiently, or even if cured, the flexibility of the film may deteriorate due to the thickness, or the effect of thinning may not be obtained. .

  The thickness of the adhesive layer is preferably 10 μm or less, more preferably 5 μm or less, and even more preferably 3 μm or less.

  In the present invention, as described above, it is preferable that neither the polarizer protective film nor the adhesive contains an ultraviolet absorber, and the ultraviolet transmittance (380 nm) of the polarizing plate is preferably 10% or more, more preferably. Is 20% or more.

  When the image display device is a liquid crystal display, a polarizing plate (light source side polarizing plate) is also provided on the light source side of the liquid crystal cell. The light source side polarizing plate has two polarizer protective films on both sides of the polarizer (light source side polarizer) (the light source side polarizer protective film of the light source side polarizer and the viewing side polarizer protective film of the light source side polarizer). It consists of a structure sandwiched between.

  For the light source side polarizing plate, replace the viewing side polarizer protective film of the viewing side polarizer with the light source side polarizer protective film of the light source side polarizer, and replace the light source side polarizer protective film of the viewing side polarizer with the light source side polarizer. The above-mentioned explanation can be applied as it is.

4). Ultraviolet-absorbing pressure-sensitive adhesive layer The present invention has an ultraviolet-absorbing pressure-sensitive adhesive layer on the viewing side from the image display cell. The ultraviolet absorbing adhesive layer may be either a substrate-type double-sided adhesive film or a substrate-less type double-sided adhesive film. The base material-less double-sided pressure-sensitive adhesive film contains an ultraviolet absorber in the pressure-sensitive adhesive. In the substrate-type double-sided adhesive film, the adhesive may contain an ultraviolet absorber, the substrate film may contain an ultraviolet absorber, or the substrate film may be coated with an ultraviolet absorber. good. However, considering the recent thinning of the image display device, a substrate-less double-sided adhesive film (sometimes simply referred to as a substrate-less adhesive) is preferable.

  The UV-absorbing pressure-sensitive adhesive layer preferably has a light transmittance at 380 nm of 10% or less, more preferably 5% or less, and particularly preferably 2% or less.

(Adhesive)
Adhesives include rubber adhesives, polyester adhesives, epoxy adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyacrylamide adhesives, and cellulose adhesives. Examples thereof include an adhesive. Among these, active energy ray curable and thermosetting acrylic pressure-sensitive adhesives are preferable. Particularly, thermosetting acrylic pressure-sensitive adhesives can adjust the pressure-sensitive adhesive properties without being affected by the ultraviolet absorber. This is preferable.

  The acrylic ester-based (co) polymer that is the base resin of the acrylic pressure-sensitive adhesive is selected by appropriately selecting the type of acrylic monomer or methacrylic monomer used to polymerize this, composition ratio, polymerization conditions, etc. It can be prepared by appropriately adjusting physical properties such as glass transition temperature (Tg) and molecular weight.

  Examples of the acrylic monomer constituting the acrylic ester (co) polymer include 2-ethylhexyl acrylate, n-octyl acrylate, isooctyl acrylate, n-butyl acrylate, ethyl acrylate, and the like as main raw materials.

  In addition to these, a (meth) acrylic monomer having various functional groups may be copolymerized with the acrylic monomer according to the purpose of imparting cohesive force or imparting polarity. Examples of the (meth) acrylic monomer having the functional group include methyl methacrylate, methyl acrylate, hydroxyethyl acrylate, acrylic acid, glycidyl acrylate, N-substituted acrylamide, acrylonitrile, methacrylonitrile, fluorine-containing alkyl acrylate, and organosiloxy group. An acrylate etc. can be mentioned.

  In addition, various vinyl monomers such as vinyl acetate, alkyl vinyl ether, and hydroxyalkyl vinyl ether that can be copolymerized with the acrylic monomer and methacrylic monomer can be appropriately used for polymerization. As the polymerization treatment using these monomers, known polymerization methods such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization and the like can be employed. An acrylic ester copolymer can be obtained by using a polymerization initiator such as an initiator.

(Crosslinking method)
Acrylic ester-based (co) polymers crosslink, thereby restricting fluidity and exhibiting a function as an adhesive. Examples of the crosslinking method include thermal crosslinking, ultraviolet crosslinking, and electron beam crosslinking, but thermal crosslinking or electron beam crosslinking is preferred because it is not affected by the ultraviolet absorber. As a crosslinking method for thermal crosslinking, there is a method in which a crosslinking agent capable of chemically bonding with a reactive group such as a hydroxyl group or a carboxylic acid group introduced into an acrylate (co) polymer is added and reacted by heating or curing. preferable.

(Thermal crosslinking agent)
Examples of the thermal cross-linking agent include an isocyanate cross-linking agent and an epoxy cross-linking agent, and one or more of these can be used.

  Examples of the isocyanate-based crosslinking agent include isocyanates such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and hydrogenated diphenylmethane diisocyanate. Monomers and isocyanate compounds obtained by adding these isocyanate monomers with trimethylolpropane, isocyanurates, burette type compounds, and addition reaction of known polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, etc. Examples include urethane prepolymer type isocyanate It is possible.

  In the isocyanate compounds exemplified above, the isocyanate group may be protected with a suitable blocking agent in order to improve processability and storage stability. Examples of the blocking agent include phenol, oxime, caprolactam, mercaptan, imide, amide, imidazole, alcohol, active methylene, and various amine compounds. According to this, known ones can be appropriately selected.

  Examples of the epoxy cross-linking agent include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, N, N, N ′, N′-tetraglycidyl-m-xylylenediamine, N, N, N ′, N′-tetraglycidylaminophenylmethane, triglycidyl isocyanurate, m-N, N-diglycidylaminophenylglycidyl ether N, N-diglycidyl toluidine, N, N-diglycidyl aniline and the like.

  In addition, it is preferable that content of these crosslinking agents is the range of 0.5-2 equivalent with respect to the introduction amount of the crosslinkable functional group of a base polymer.

(UV absorber)
As the ultraviolet absorber, well-known ones such as benzotriazole, benzophenone, salicylic acid, and cyanoacrylate can be used. Examples of the benzotriazole type include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-5′-t-butylphenyl) benzotriazole, and 2- (2′-hydroxy-3). ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy) -3 ′, 5′-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-amylphenyl) benzotriazole, 2- (2 ′ -Hydroxy-4'-octoxyphenyl) benzotriazole and the like.

  Examples of benzophenone ultraviolet absorbers include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2′-dihydroxy- Examples thereof include 4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone.

  Examples of salicylic acid-based ultraviolet absorbers include phenyl salicylate, pt-butylphenyl salicylate, and p-octylphenyl salicylate.

  Examples of the cyanoacrylate ultraviolet absorber include 2-ethylhexyl-2-cyano-3, 3-diphenyl acrylate, ethyl-2-cyano-3, 3-diphenyl acrylate and the like.

  These ultraviolet absorbers can be used alone or in combination of two or more.

(Adhesive layer substrate)
When a base material is used as the adhesive layer, various transparent films conventionally used as optical films can be used as the base film. For example, although not particularly limited, a polyester film, a triacetyl cellulose (TAC) film, an acrylic film, a cyclic olefin film (for example, a norbornene film), a polypropylene film, and a polyolefin film (for example, TPX) Etc.

(Lamination position of UV absorbing adhesive layer)
The lamination position of the ultraviolet absorbing adhesive layer is not particularly limited as long as it is on the viewing side of the image display cell. For example, when a liquid crystal display is taken as an example, the ultraviolet absorbing adhesive layer can be provided between the liquid crystal cell and the viewing side polarizing plate or at an arbitrary position on the viewing side with respect to the viewing side polarizing plate. More specifically, the ultraviolet absorbing adhesive layer can be provided at the following positions: between the liquid crystal cell and the viewing side polarizing plate, between the viewing side polarizing plate and the anti-scattering film, and the viewing side polarizing plate and the surface. Between the protective plate, between the viewing side polarizing plate and the surface cover film, between the scattering prevention film and the electrode film for touch panel, between the two touch panel electrode films, and between the scattering prevention film and the surface protection plate , Between the surface protection plate and the surface cover film. Among these, it is the most preferable mode to use a base material-less UV-absorbing adhesive layer for bonding between the liquid crystal cell and the viewing-side polarizing plate.

  In addition, when the light source side polarizer protective film of a visual recognition side polarizer is a phase difference plate containing a liquid crystal compound, a liquid crystal compound may deteriorate with an ultraviolet-ray. In this case, it is preferable that an ultraviolet-absorbing adhesive layer is provided on the viewing side from the viewing-side polarizing plate. In this case, the ultraviolet absorbing adhesive is not necessarily required between the polarizing plate and the image display cell.

(Light source side UV absorbing adhesive layer)
In the present invention, as in the case of a liquid crystal display, when the light source is on the side opposite to the viewing side of the image display cell, an ultraviolet absorbing adhesive layer is provided on the light source side of the image display cell. Is preferred. In such a case, the lamination position of the ultraviolet absorbing adhesive layer is not particularly limited as long as it is on the light source side of the image display cell. For example, between the liquid crystal cell and the light source side polarizing plate, between the light source side polarizing plate and the polarization selective reflector, between the light source side polarizing plate and the diffusion sheet or lens sheet, and between the light guide plate and the diffusion sheet or lens sheet. And the like. Among these, a preferred position is between the liquid crystal cell and the light source side polarizing plate.

Detailed examples of the configuration of the present invention will be described below with reference to the drawings. The present invention is not limited to this figure.
FIG. 1 is an example of a television or a computer display. The upper part is the viewer side, and the lower part is the light source side. Polarizing plates (1, 2) are laminated on both surfaces of the liquid crystal cell (41) via ultraviolet absorbing adhesive layers (51, 52). Although details of the liquid crystal cell are not shown, a liquid crystal compound is sealed between two glass plates provided with liquid crystal drive electrodes, and a color filter is further provided.

  In the polarizing plate, polarizer protective films (12, 13, 22, 23) are laminated on both sides of a polarizer (11, 21) via an active energy ray-curable adhesive (not shown). The viewing side polarizer protective film (12) of the viewing side polarizer and the light source side polarizer protecting film (22) of the light source side polarizer are high retardation alignment films or films having no birefringence. The light source side polarizer protective film (13) of the viewer side polarizer and the viewer side polarizer protective film (23) of the light source side polarizer are a film having no birefringence or an optical compensation film. At least one of the viewing side polarizer protective film (12) of the viewing side polarizer or the light source side polarizer protecting film (13) of the viewing side polarizer is a low moisture permeability film. Further, at least one of the light source side polarizer protective film (22) of the light source side polarizer and the viewer side polarizer protective film (23) of the light source side polarizer is a low moisture permeability film.

  An antiglare layer (14) made of an acrylic resin and organic fine particles is provided on the viewing side surface of the viewing side polarizer protective film of the viewing side polarizer which is the outermost surface. Although not shown, an appropriate easy adhesion layer may be provided on the surface layer of each film. Although not shown, the light source side further includes a light source unit composed of a phosphor white LED light source on the side edge, a light guide plate, a lens film, and a polarization selective reflection plate.

  FIG. 2 is an example of a touch panel integrated liquid crystal panel such as a smart phone or a tablet computer. The upper part is the viewer side, and the lower part is the light source side. Differences from FIG. 1 will be mainly described.

  Although details of the touch panel integrated liquid crystal cell (42) are not shown, a glass plate enclosing the liquid crystal is provided with a touch panel electrode in addition to the liquid crystal drive electrode. The touch panel electrode may be either an inner surface (in-cell type) or an outer surface (on-cell type) of a glass plate enclosing a liquid crystal.

  A surface cover (3) is attached to the viewing side of the viewing side polarizer protective film (12) of the viewing side polarizer. Although the front cover is optional, the scattering prevention film (32) is laminated on the glass plate. Various layers are laminated on the viewing side of the viewing side polarizer protective film via the ultraviolet absorbing adhesive layer (53, 54). In FIG. 2, at least one of the UV-absorbing adhesive layers (51, 53, 54) may be UV-absorbing, and it is not always necessary to provide all of them.

  FIG. 3 is an example of a liquid crystal cell-touch panel separation type such as a smart phone or a tablet computer, and the touch panel illustrates a capacitance type. The upper part is the viewer side, and the lower part is the light source side. Differences from FIG. 1 will be mainly described.

  The touch panel portion is laminated on the viewing side of the viewing side polarizer protective film (12) of the viewing side polarizer. In the touch panel, a film or glass provided with a transparent electrode is laminated via an ultraviolet absorbing adhesive layer (55). As the transparent electrode, a known electrode such as an ITO electrode, a metal mesh electrode, a fine metal wire, or a self-organized (net-like) conductive paste can be used. Furthermore, a surface cover (3) may be provided on the viewing side. A scattering prevention film (71) may be provided between the viewing side polarizer protective film (12) of the viewing side polarizer and the touch panel (6). In that case, the scattering prevention film (32) is necessarily required. is not.

  Moreover, in FIG. 3, although it is a space | gap between the surface cover (3), a touch panel (6), a scattering prevention film (71), and the visual recognition side polarizer protective film (12) of a visual recognition side polarizer, it sticks with an adhesive layer. May be combined. In this case, either the UV-absorbing adhesive layer (55) between the transparent electrodes or the UV-absorbing adhesive layer (51) between the liquid crystal cell and the light source-side polarizer protective film (13) of the viewing-side polarizer is included. The adhesive layer may be an ultraviolet-absorbing adhesive layer.

Hereinafter, the manufacturing method of the liquid crystal display having the configuration shown in FIG. 1 will be specifically described as a representative example.
(Creation of UV-absorbing pressure-sensitive adhesive layer)
100 parts by mass of an acrylic copolymer (weight average molecular weight 700,000) consisting of 77 parts by mass of butyl acrylate, 30 parts by mass of methyl acrylate, and 3 parts by mass of 2-hydroxyethyl acrylate, an acrylic ester copolymer (weight) Average molecular weight: 750,000) 100 parts by mass (in terms of solid content, the same applies hereinafter), 4 parts by mass of hexamethylene diisocyanate, and 10% by mass of benzotriazole-based UV absorber (TINVAIN 109, manufactured by Ciba Specialty Chemicals) in methyl ethyl ketone Dissolved to make a 25 wt% solution. This was applied to a release-coated PET film (release PET film) with an applicator so that the thickness after drying was 23 μm, dried at 90 ° C. for 90 seconds, and then subjected to aging treatment at 40 ° C. for 3 days. went.

(Creation of high retardation oriented film)
PET (IV = 0.62) was dried by a conventional method, supplied to an extruder, and melted at 285 ° C. This polymer is filtered through a stainless steel filter medium (nominal filtration accuracy: 10 μm particle 95% cut), extruded into a sheet form from the die, and wound on a casting drum having a surface temperature of 30 ° C. using an electrostatic application casting method. And solidified by cooling to produce an unstretched film.

Next, after applying an adhesive modification coating solution having the following composition on both sides of this unstretched PET film by a reverse roll method so that the coating amount after drying becomes 0.08 g / m ² , Dry for 2 seconds.

(Adhesive modified coating solution)
-Copolyester resin 4.5 parts by weight Terephthalic acid 46 mol%
Isophthalic acid 46mol%
Sodium 5-sulfonatoisophthalate 8 mol%
Ethylene glycol 50 mol%
Neopentyl glycol 50 mol%
-Aggregate silica particles (Fuji Silysia Co., Ltd., Silicia 310) 0.5 parts by mass-53 parts by weight of water-37 parts by weight of isopropyl alcohol-5 parts by weight of n-butyl cellosolve-Nonionic surfactant 0. 06 parts by mass

  The unstretched film on which the coating layer was formed was guided to a tenter stretching machine, guided to a hot air zone at a temperature of 125 ° C. while being gripped by a clip, and stretched 4.0 times in the width direction. Next, while maintaining the width stretched in the width direction, the film was treated at a temperature of 225 ° C. for 30 seconds and further subjected to a relaxation treatment of 3% in the width direction to obtain a uniaxially oriented PET film having a film thickness of about 100 μm. The retardation of the obtained uniaxially oriented PET film was 10200 nm, Rth was 13233 nm, and Re / Rth was 0.771.

The water vapor permeability of the uniaxially oriented PET film was 6.8 g / m ² / d. The water vapor permeability was measured after purging with a water vapor permeability measuring device (PERMATRAN-W 3/31, manufactured by Modern Controls) at a temperature of 40 ° C. and a humidity of 90% RH for 2 days in accordance with JIS-K7129 B method. . The unit is g / m ² · 24 hr.

(Active energy ray-curable adhesive composition)
• 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate 40 parts • Bisphenol A type epoxy resin 60 parts • Diphenyl [4- (phenylthio) phenyl] sulfonium hexafluoroantimonate (cationic polymerization initiator) 4.0 Parts ・ Benzoin methyl ether (photosensitizer) 1.0 part

  The epoxy equivalent of 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate was 126 g / eq, and the epoxy equivalent of bisphenol A type epoxy resin was 187 g / eq. The total chlorine content of the adhesive composition was 840 ppm, and the viscosity measured at 60 rpm with a B-type viscometer at 25 ° C. was 3000 mPa · s. The total chlorine content of the adhesive composition was measured by a titration method using a silver nitrate solution in accordance with JIS K 7243-3 (ISO 21627-3).

(Water-based adhesive)
・ Pure water 100 parts ・ Carboxyl group-modified polyvinyl alcohol [Kuraray Poval KL318 (manufactured by Kuraray Co., Ltd.) 3.0 parts ・ Water-soluble polyamide epoxy resin (aqueous solution with a solid concentration of 30%) Sold from the company)] 1.5 copies

(Manufacture of polarizing plates)
The active energy ray-curable adhesive composition having the above composition is applied to one surface of the highly retardation-oriented polyester film (uniaxially oriented PET film) obtained above by a coating apparatus equipped with a chamber doctor. Coated. A saponified triacetyl cellulose film (thickness: 80 μm) was coated with a water-based adhesive having the above composition at a thickness of 2 μm using the same apparatus.

Immediately after the adhesive composition is applied to each film, a polyester film is applied to one side of a polarizing film made of PVA and iodine, and a saponified triacetyl cellulose film is applied to the other side, respectively. It bonded by the bonding roll through the coating surface. Then, after irradiating the metal halide lamp from the polyester film side so that the integrated light quantity at a wavelength of 320 to 400 nm is 600 mJ / cm ² , the film is further passed through a hot air circulation dryer set at 70 ° C. The adhesive was cured. The polarizing plate thus obtained was then wound into a roll by a winding device. The angle between the orientation direction of the polarizer (absorption axis direction) and the orientation main axis of the high retardation oriented film was within 90 ± 3 degrees.

  The transmittance of the polarizing plate was measured by the following method. Using a spectrophotometer (U-3500 type, manufactured by Hitachi, Ltd.), the light transmittance in the wavelength region of 300 to 500 nm of the polarizing plate was measured using the air layer as a standard, and the light transmittance at a wavelength of 380 nm was determined. The transmittance of 380 nm light of the polarizing plate was 43%.

(Creation of liquid crystal display)
A release PET film coated with the above-described ultraviolet absorbing adhesive layer was bonded to the triacetyl cellulose film surface of the polarizing plate prepared above. The release PET film was peeled off from the polarizing plate on which the ultraviolet absorbing adhesive layer was laminated, and this was bonded to both sides of a TN liquid crystal cell to prepare a liquid crystal panel. The obtained liquid crystal panel was taken out from a commercially available small liquid crystal television to a light source unit (side edge type phosphor type white LED light source, light guide plate, lens sheet, polarization selective reflector (D-BEF manufactured by 3M)). Attached to the liquid crystal display.

  In addition, although the manufacturing method of the liquid crystal display of the structure of FIG. 1 was demonstrated as a typical example, the thing of the structure of FIG. 2, FIG. 3 and also another structure WHEREIN: The above-mentioned ultraviolet rays are used instead of the conventional adhesive. It can manufacture by changing to an absorptive adhesive.

1: Viewing side polarizing plate 2: Light source side polarizing plate 3: Front cover 6: Touch panel 11: Viewing side polarizer 12: Viewing side polarizer protecting film of viewing side polarizer 13: Light source side polarizer protection of viewing side polarizer Film 14: Antiglare layer 21: Light source side polarizer 22: Light source side polarizer protective film 23 of light source side polarizer 23: Viewing side polarizer protective film 31 of light source side polarizer 31: Glass plate 32: Anti-scattering film 41: Liquid crystal Cell 42: Touch panel integrated liquid crystal cell 51: Ultraviolet absorbing adhesive layer 52: Ultraviolet absorbing adhesive layer 53: Ultraviolet absorbing adhesive layer 54: Ultraviolet absorbing adhesive layer 55: Ultraviolet absorbing adhesive layer 61: Transparent electrode 62: Transparent Electrode 71: Anti-scattering film

Claims (5)

An image display device having an image display cell and a polarizing plate located on the viewing side of the image display cell,
The polarizing plate has a polarizer protective film laminated on both sides of the polarizer,
At least one of the polarizer protective films is laminated with the polarizer via an active energy ray-curable adhesive,
An image display device comprising an ultraviolet-absorbing pressure-sensitive adhesive layer on the viewing side of the image display cell. The image display device according to claim 1, wherein at least one of the polarizer protective films is a low moisture-permeable film. The image display device according to claim 1, wherein at least one of the polarizer protective films has a retardation of 3000 to 150,000 nm. The image display device according to claim 1, wherein the image display cell is a liquid crystal cell. The image display device according to claim 1, wherein the image display cell and the polarizing plate are laminated via an ultraviolet absorbing adhesive layer.

Images