TW202304703A - Optical laminate capable of balancing and satisfying suppression of cellulite, resistance to partial loading, and suppression of warpage under high-temperature and high-humidity environment - Google Patents

Abstract

This invention aims to provide an optical laminate capable of balancing and satisfying the suppression of cellulite, the resistance of partial loading, and the suppression of warpage under high-temperature and high-humidity environment. The optical laminated of the invention includes: a polarizing plate; a first optical functional body bonded to the viewing side of the polarizing plate via a first adhesive layer; a reinforcement layer bonded to the viewing side of the first optical functional body via a second adhesive layer; and a second optical functional body bonded to the viewing side of the reinforcement layer via a third adhesive layer. The respective thickness of the first adhesive layer, the second adhesive layer, and the third adhesive layer is below 17 [mu]m. The sum of the thickness of the first optical functional body, the thickness of the reinforcement layer, and the thickness of the second optical functional body is below 200 [mu]m.

Description

Optical laminate

The present invention relates to an optical laminate.

In recent years, image display devices typified by liquid crystal display devices and electroluminescent (EL) display devices (eg, organic EL display devices and inorganic EL display devices) have become popular rapidly. In an image display device, an optical laminate including a polarizing plate and an optically functional layer (such as an anti-reflection layer and an anti-reflection layer) is typically used. As such an optical laminate, for example, a polarizing plate with an antireflection layer and an antireflection layer is known (for example, Patent Document 1). In the polarizing plate with an anti-reflection layer and an anti-reflection layer, the anti-reflection laminate system including the anti-reflection layer is attached to the viewing side of the polarizer through the adhesive layer, and the anti-reflection laminate system including the anti-reflection layer passes through the adhesive layer Attached to the viewing side of the anti-mapping laminate. However, in polarizing plates with anti-reflection layers and anti-reflection layers, microscopic irregularities called orange peel may occur on the viewing side surface, which may adversely affect the display performance of image display devices.

In addition, a partial load may be applied to an optical layered body used for an image display device. On the other hand, depending on the configuration of the optical laminate, the polarizing plate may be damaged by the local load, and as a result, light leakage or bright spots (so-called white spots) may occur in the image display device. In addition, the optical layered body having a plurality of optically functional layers has the problem of warping easily occurring in a high-humidity environment. Current Technical Literature patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2018-155998

The present invention was made to solve the aforementioned conventional problems, and its main purpose is to provide an optical layered body that satisfies the suppression of orange peel, resistance to local loads, and suppression of warpage in high-humidity environments in a balanced manner.

MEANS FOR SOLVING THE PROBLEMS An optical laminate according to an embodiment of the present invention includes: a polarizing plate; a first optical functional body that is bonded to the viewing side of the polarizing plate through a first adhesive layer; a reinforcing layer that transmits The second adhesive layer is attached to the viewing side of the first optical functional body; and the second optical functional body is attached to the viewing side of the reinforcing layer through the third adhesive layer; the first adhesive Layer, the second adhesive layer, and the third adhesive layer each have a thickness of 17 μm or less; the sum of the thickness of the first optical functional body, the thickness of the reinforcing layer, and the thickness of the second optical functional body is 200 μm or less . In one embodiment, the first optical functional body is an anti-reflection laminate, and the anti-reflection laminate includes: an anti-reflection layer in contact with the first adhesive layer; It is on the viewing side of the anti-reflection layer and is in contact with the aforementioned second adhesive layer. In one embodiment, the second optical function body is an antireflection laminate, and the antireflection laminate includes: a second base material in contact with the third adhesive layer; a hard coat layer disposed on the viewing side of the second substrate; and an anti-reflection layer disposed on the viewing side of the hard coat layer. In one embodiment, the antireflection layer is located on the outermost surface of the optical laminate, and the moisture permeability of the antireflection layer is 0.1 g/mm ² or less. In one embodiment, the polarizer includes: a polarizer; and a protective layer, which is arranged on the viewing side of the polarizer and in contact with the first adhesive layer. In one embodiment, the polarizer has a thickness of 10 μm or less. In one embodiment, the optical layered body further includes a first retardation layer and a second retardation layer arranged sequentially from the polarizing plate side on the side opposite to the viewing side of the polarizing plate; the first retardation layer The layer exhibits a refractive index characteristic of nx>ny>nz, and the second retardation layer exhibits a refractive index characteristic of nz>nx>ny.

Invention effect According to an embodiment of the present invention, the thickness of each adhesive layer is not more than the above upper limit, a reinforcing layer is provided between the first optical functional body and the second optical functional body, and the first optical functional body, the reinforcing layer, and the second optical functional body The sum of the thicknesses of the functional body is not more than the above upper limit, whereby an optical laminate can be realized which satisfies the balance of suppression of orange peel, resistance to local load, and suppression of warping in high-humidity environments.

Representative embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

(Definition of terms and symbols) Definitions of terms and symbols in this manual are as follows. (1) Refractive index (nx, ny, nz) "nx" is the refractive index in the direction where the in-plane refractive index becomes the largest (that is, the direction of the slow axis), "ny" is the refractive index in the direction that is perpendicular to the slow axis in the plane (that is, the direction of the fast axis), and "nz" is the refractive index in the thickness direction. (2) In-plane retardation (Re) "Re(λ)" is the in-plane retardation of the film measured at 23°C with light having a wavelength of λnm. For example, "Re(450)" is the in-plane retardation of a film measured at 23° C. with light having a wavelength of 450 nm. Re(λ) can be obtained by the formula: Re=(nx-ny)×d when the thickness of the film is set as d(nm). (3) Phase difference in the thickness direction (Rth) "Rth(λ)" is the retardation in the thickness direction of the film measured at 23° C. with light having a wavelength of λnm. For example, "Rth(450)" is the retardation in the thickness direction of the film measured at 23°C with light having a wavelength of 450 nm. Rth(λ) can be obtained by the formula: Rth=(nx-nz)×d when the thickness of the film is set as d(nm). (4) Nz coefficient The Nz coefficient can be obtained by Nz=Rth/Re. (5) angle When an angle is mentioned in this specification, unless otherwise specified, the angle includes an angle in both directions of a clockwise direction and a counterclockwise direction.

A. The overall composition of the optical laminate Fig. 1 is a schematic cross-sectional view showing an optical layered body according to an embodiment of the present invention. The optical laminated body 1 of the illustrated example includes: a polarizing plate 2; a first optical function body 3, which is bonded to the viewing side of the polarizing plate 2 through the first adhesive layer 61; a reinforcing layer 5, which is through the second adhesive layer 61. The adhesive layer 62 is attached to the viewing side of the first optical functional body 3 ; and the second optical functional body 4 is attached to the viewing side of the reinforcing layer 5 through the third adhesive layer 63 . That is, the second optical functional body 4, the third adhesive layer 63, the reinforcing layer 5, the second adhesive layer 62, the first optical functional body 3, and the first adhesive layer are sequentially laminated from the viewing side of the optical laminate 1. Agent layer 61 and polarizer 2. The respective thicknesses of the first adhesive layer 61 , the second adhesive layer 62 , and the third adhesive layer 63 are 17 μm or less, preferably 15 μm or less, typically 5 μm or more. The first adhesive layer 61, the second adhesive layer 62, and the third adhesive layer 63 may have the same thickness or different thicknesses. In one embodiment of the present invention, the first adhesive layer 61, the second adhesive layer 62, and the third adhesive layer 63 have the same thickness as each other. The sum of the thickness of the first optical functional body 3 , the thickness of the reinforcing layer 5 and the thickness of the second optical functional body 4 is 200 μm or less, preferably 180 μm or less, more preferably 170 μm or less, typically 140 μm or more. The orange peel pattern produced on the surface of the viewing side of the optical laminate may be caused by the unevenness of the adhesive layer. On the other hand, if it is the above-mentioned structure, the thickness of each adhesive layer is below the above-mentioned upper limit, so that the unevenness of the adhesive layer can be suppressed from affecting the surface of the optical layered body on the viewing side, and the visibility of the optical layered body can be suppressed. The surface of the identified side produces orange peel. However, when the thickness of each adhesive agent layer is made below the said upper limit, the resistance of an optical laminated body with respect to the local load may fall. In this regard, if the structure is as described above, since the reinforcing layer is provided between the first optical functional body and the second optical functional body, cracks will not occur even if a load exceeding a predetermined value is locally applied to the optical layered body. , As a result, an image display device with suppressed light leakage and bright spots (white spots) can be realized. Furthermore, since the sum of the thickness of the first optical functional body, the thickness of the reinforcing layer, and the thickness of the second optical functional body is not more than the upper limit, even if the reinforcing layer is provided between the first optical functional body and the second optical functional body, Can suppress warping of optical laminates under high humidity environment. Therefore, it is possible to realize an optical layered body that satisfies the suppression of orange peel, the resistance to partial load, and the suppression of warpage in a high-humidity environment in a balanced manner.

In one embodiment of the present invention, the optical layered body 1 further includes a first retardation layer 7 and a second retardation layer 8 arranged in order from the polarizing plate 2 side on the side opposite to the viewing side of the polarizing plate 2 . The first retardation layer 7 preferably exhibits a refractive index characteristic of nx>ny>nz. The second retardation layer 8 preferably exhibits a refractive index characteristic of nz>nx>ny. According to the above configuration, a desired optical compensation function can be imparted to the optical layered body 1 .

Moreover, in one embodiment of the present invention, the optical layered body 1 further includes a panel-side adhesive layer 9 . The panel-side adhesive layer 9 is arranged on the opposite side of the first retardation layer 7 with respect to the second retardation layer 8 . When the optical laminate 1 has the panel-side adhesive layer 9 , the optical laminate 1 can be attached to the image display unit by using the panel-side adhesive layer 9 .

In addition, in one embodiment of the present invention, the thickness of the optical laminate 1 is typically not more than 330 μm, preferably not more than 310 μm, more preferably not more than 300 μm, and typically not less than 250 μm, preferably not less than 270 μm. According to the said structure, since the thickness of the optical layered body 1 is below the said upper limit, the warpage of an optical layered body in a high-humidity environment can be suppressed stably. Moreover, since the thickness of the optical layered body 1 is not less than the above-mentioned lower limit, even if a load of a predetermined value or more is locally applied to the optical layered body, occurrence of cracks can be stably suppressed.

The constituent elements of the optical layered body will be described below.

B. Polarizer In one embodiment of the present invention, the polarizer 2 includes a polarizer 21 and a protective layer 22 disposed on the viewing side of the polarizer 21 . The protection layer 22 represents that the top is pasted on the viewing side of the polarizer 21 through any appropriate adhesive layer (adhesive layer, adhesive layer: not shown). That is, the polarizer 2 may also be composed of a polarizer 21 , an adhesive layer, and a protective layer 22 . The protection layer 22 is located between the polarizer 21 and the first adhesive layer 61 , and is in contact with the first adhesive layer 61 . The protective layer 22 is pressure-sensitively bonded to the first adhesive layer 61 . In addition, the polarizing plate 2 may further include a second protective layer on the side opposite to the viewing side of the polarizer 21 .

B-1. Polarizer Any appropriate polarizer can be used as the polarizer 21 . For example, the resin film forming the polarizing plate 2 may be a single-layer resin film, or may be a laminate of two or more layers.

A specific example of a polarizer composed of a single-layer resin film is one in which a PVA-based resin film is dyed with iodine and stretched (typically, uniaxially stretched). The above-mentioned dyeing with iodine is performed, for example, by immersing a PVA-based film in an iodine aqueous solution. The elongation ratio of the above-mentioned uniaxial elongation is preferably 3 to 7 times. Elongation can be performed after dyeing or while dyeing. In addition, dyeing may be performed after elongation. Swelling treatment, crosslinking treatment, washing treatment, drying treatment, etc. are performed on the PVA-based resin film as required. For example, by immersing the PVA-based resin film in water for washing before dyeing, not only can the dirt and anti-adhesive agent on the surface of the PVA-based film be cleaned, but also the PVA-based resin film can be swollen to prevent uneven dyeing.

Specific examples of a polarizer using a laminate include a laminate using a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a laminate using a resin substrate and a coating layer. A polarizer obtained by a laminate of PVA-based resin layers formed on the resin substrate. A polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer coated and formed on the resin base material can be produced, for example, by applying a PVA-based resin solution to the resin base material and making it drying to form a PVA-based resin layer on the resin substrate to obtain a laminate of the resin substrate and the PVA-based resin layer; the laminate is stretched and dyed to make the PVA-based resin layer into a polarizer. In one embodiment of the present invention, it is preferable to form a polyvinyl alcohol-based resin layer comprising a halide and a polyvinyl alcohol-based resin on one side of the resin substrate. Extending typically includes extending the laminate by immersing it in an aqueous solution of boric acid. Furthermore, stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95° C. or higher) before stretching in a boric acid aqueous solution. In addition, in one embodiment of the present invention, it is preferable to subject the laminated body to a drying shrinkage treatment in which the laminated body is heated while being transported along the longitudinal direction so that it shrinks by 2% or more in the width direction. . Typically, the manufacturing method of this embodiment includes sequentially performing aerial assisted stretching treatment, dyeing treatment, underwater stretching treatment, and drying shrinkage treatment on the laminated body. By introducing auxiliary stretching, even when PVA is coated on a thermoplastic resin, the crystallinity of PVA can be improved, and high optical characteristics can be realized. At the same time, by improving the orientation of PVA in advance, problems such as decrease in orientation or dissolution of PVA when immersed in water in the subsequent dyeing step or stretching step can be prevented, and high optical characteristics can be realized. Furthermore, compared with the case where the PVA-based resin layer does not contain a halide, when the PVA-based resin layer is immersed in a liquid, disorder of orientation of polyvinyl alcohol molecules and decrease in orientation can be suppressed. Thereby, the optical characteristic of the polarizer obtained through the processing step of immersing a laminated body in liquid, such as dyeing process and underwater stretching process, can be improved. Furthermore, the optical characteristics can be improved by shrinking the laminate in the width direction by drying shrinkage treatment. The obtained resin substrate/polarizer laminate can be used directly (that is, the resin substrate can be used as a protective layer for the polarizer), or the resin substrate can be peeled off from the resin substrate/polarizer laminate and then Any suitable protective layer suitable for the purpose of the surface layer shall be used. Details of the manufacturing method of the polarizer are described in, for example, Japanese Patent Laid-Open No. 2012-73580 and Japanese Patent No. 6470455. All the descriptions in these publications are incorporated by reference in this specification.

The polarizer 21 is preferably composed of a laminate of two or more layers, preferably a laminate of a resin substrate and a PVA-based resin layer coated on the resin substrate.

The thickness of the polarizer 21 is preferably not more than 15 μm, more preferably not more than 12 μm, more preferably not more than 10 μm, especially not more than 8 μm, and typically not less than 1 μm, preferably not less than 3 μm. When the thickness of the polarizer is within the above-mentioned range, the occurrence of warping of the optical layered body in a high-humidity environment can be suppressed more stably.

The polarizer 21 preferably exhibits absorption dichroism at any wavelength from 380 nm to 780 nm. The single transmittance of the polarizer 21 is, for example, 41.5%-46.0%, preferably 43.0%-46.0%, more preferably 44.5%-46.0%. The degree of polarization of the polarizer 21 is preferably 97.0% or more, more preferably 99.0% or more, more preferably 99.9% or more.

B-2. Protective layer The protective layer 22 is formed of any appropriate film that can be used as a protective layer of the polarizer 21 . Specific examples of the material used as the main component of the film include cellulose-based resins such as cellulose triacetate (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyamide-based resins, etc. Imide-based, polyether-based, poly-based, polystyrene-based, polynorthylene-based, polyolefin-based, (meth)acrylic-based, acetate-based transparent resins, etc. Further, thermosetting resins such as (meth)acrylic, urethane, (meth)acrylate urethane, epoxy, and silicone, or ultraviolet curable resins are also mentioned. In addition, "(meth)acrylic resin" means an acrylic resin and/or a methacrylic resin. Other examples include glassy polymers such as siloxane polymers. Moreover, the polymer film described in Unexamined-Japanese-Patent No. 2001-343529 (WO01/37007) can also be used. As the material of the film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain can be used, such as Examples include resin compositions having alternating copolymers of isobutylene and N-methylmaleimide and acrylonitrile-styrene copolymers. The polymer film may be, for example, an extruded product of the aforementioned resin composition.

In one embodiment of the present invention, the protective layer 22 includes (meth)acrylic resin. As the (meth)acrylic resin, for example, a (meth)acrylic resin having a glutarimide structure can be used. (Meth)acrylic resins having a glutarimide structure are described, for example, in Japanese Patent Laid-Open No. 2006-309033, Japanese Patent Laid-Open No. 2006-317560, Japanese Patent Laid-Open No. 2006-328329, Japanese Patent Laid-Open No. Japanese Patent Laid-Open No. 2006-328334, Japanese Patent Laid-Open No. 2006-337491, Japanese Patent Laid-Open No. 2006-337492, Japanese Patent Laid-Open No. 2006-337493, Japanese Patent Laid-Open No. 2006-337569, Japanese Patent Laid-Open No. In Japanese Patent Laid-Open No. 2007-009182, Japanese Patent Laid-Open No. 2009-161744, and Japanese Patent Laid-Open No. 2010-284840. These descriptions are used as a reference in this specification.

Typically, the thickness of the protective layer 22 is less than 300 μm, preferably less than 100 μm, more preferably 5 μm-80 μm, more preferably 10 μm-60 μm. In addition, when surface treatment is performed, the thickness of the protective layer 22 is the thickness including the thickness of the surface treatment layer.

C. The first optical function body The first optical function body 3 can impart a desired optical function to the optical layered body 1 . As the first optical functional body 3 , for example, a resist-mapping laminate, a laminate corresponding to sunglasses, and the like can be mentioned. The thickness of the first optical functional body 3 is typically 20 μm to 60 μm, preferably 30 μm to 50 μm.

In one embodiment of the present invention, the first optical functional body 3 is an anti-reflection laminated body 3a. The anti-map layered body 3 a includes an anti-map layer 32 and a first substrate 31 disposed on the viewing side of the anti-map layer 32 . The anti-reflection layer 32 is supported by the first substrate 31 . The anti-reflection layer 32 is disposed on the viewing side relative to the protection layer 22 , and is bonded to the protection layer 22 through the first adhesive layer 61 . The anti-reflection layer 32 is in contact with the first adhesive layer 61 and is pressure-sensitively bonded to the first adhesive layer 61 . The first substrate 31 is located on the opposite side to the first adhesive layer 61 with respect to the anti-reflection layer 32 . The first substrate 31 is in contact with the second adhesive layer 62 and is pressure-sensitively bonded to the second adhesive layer 62 .

C-1. Anti-mapping layer The anti-reflection layer 32 is provided to prevent the reflection of the user's face of the image display device, the keyboard of the image display device, external light (such as fluorescent lamps), and the like. In one embodiment of the present invention, the anti-reflection layer 32 is an alignment solidified layer of a liquid crystal compound. In the present specification, the "alignment solidified layer" refers to a layer in which a liquid crystal compound is aligned along a predetermined direction within the layer and its orientation state is fixed. In addition, the "alignment hardening layer" is a concept including the alignment hardening layer obtained by hardening a liquid crystal monomer. The liquid crystal compound may be a rod-shaped liquid crystal compound, a discotic (discotic) liquid crystal compound, or a combination thereof.

In one embodiment of the present invention, the anti-reflection layer 32 includes a discotic liquid crystal compound. More specifically, the anti-reflection layer 32 is a layer in which the discotic liquid crystal compound has been fixed in a state in which it has been oriented in a predetermined direction. Discotic liquid crystal compounds generally refer to liquid crystal compounds with the following disc-shaped molecular structure: cyclic nuclei such as benzene, 1,3,5-trisalpine, and calixarene are arranged in the center of the molecule, and the linear Alkyl, alkoxy, substituted benzoyloxy, etc. are substituted radially as their side chains. Representative examples of discotic liquid crystals include benzene derivatives, triphenylene derivatives, Indenacene derivatives, phthalocyanine derivatives; or, cyclohexane derivatives described in the research report of B. Kohne et al., Angew. Chem. Vol. 96, p. 70 (1984); and J. M. Lehn et al. Research report of J. Chem. Soc. Chem. Commun., 1794 pages (1985), research report of J. Zhang et al., J. Am. Chem. Soc. Volume 116, 2655 pages (1994) Nitrogen crown or phenylacetylene macrocycle. Further specific examples of discotic liquid crystal compounds include, for example, JP-A-2006-133652 , JP-A-2007-108732 , JP-A-2010-244038 , JP-A-2014-214177 Compounds described in the Publication No. In this specification, the descriptions of the above-mentioned documents and publications are used as a reference. The anti-reflection layer comprising a discotic liquid crystal compound can typically be a so-called negative A plate (Negative A Plate) having a refractive index characteristic of nx=nz>ny.

In other embodiments, the anti-reflection layer 32 includes a rod-shaped liquid crystal compound. More specifically, the anti-reflection layer is oriented in a state where rod-shaped liquid crystal compounds are aligned along a predetermined direction (representatively, the slow axis direction) (hinge-plane orientation). As a rod-shaped liquid crystal compound, the liquid crystal compound (nematic liquid crystal) whose liquid crystal phase is a nematic phase is mentioned, for example. As the liquid crystal compound, for example, a liquid crystal polymer or a liquid crystal monomer can be used. The mechanism for exhibiting the liquid crystallinity of the liquid crystal compound may be lyotropic or thermotropic. The liquid crystal polymer and the liquid crystal monomer may be used alone or in combination. As the liquid crystal monomer, any appropriate liquid crystal monomer can be used. For example, the Japanese Patent Special Table 2002-533742 (WO00/37585), EP358208 (US5211877), EP66137 (US4388453), WO93/22397, EP0261712, DE19504224, DE4408171 and GB228044555 and GB22804455 The concentrated LCD primary compounds recorded in the medium. Specific examples of the polymerizable mesogen compound include, for example, BASF's trade name LC242, Merck's trade name E7, and Wacker-Chem's trade name LC-Sillicon-CC3767. As the liquid crystal monomer, for example, a nematic liquid crystal monomer is preferable. Specific examples of liquid crystal compounds are described in, for example, Japanese Patent Application Laid-Open No. 2006-163343. This specification refers to the description of the publication as a reference. Typically, the anti-reflection layer comprising rod-like liquid crystal compounds may be a so-called positive A plate having a refractive index characteristic of nx>ny=nz.

The anti-mapping layer 32 typically functions as a λ/2 plate. When the anti-reflection layer 32 functions as a λ/2 plate, by controlling its orientation angle (or direction of the slow axis), reflection can be well prevented. The in-plane retardation Re(550) of the anti-mapping layer 32 is 220nm~320nm, more preferably 240nm~300nm, more preferably 250nm~280nm.

The angle formed by the slow axis of the anti-reflection layer 32 and the absorption axis of the polarizer 21 is preferably 35°-55°, more preferably 40°-50°, more preferably about 45°. By arranging the anti-reflection layer 32 functioning as a λ/2 plate at the above-mentioned axis angle, reflection can be well prevented.

The thickness of the anti-mapping layer 32 is preferably 1 μm˜5 μm, more preferably 1 μm˜3 μm.

When an alignment film is used for alignment of liquid crystal compounds, the anti-reflection laminate 3 a further includes an alignment film between the anti-reflection layer 32 and the first substrate 31 . That is, the anti-reflection layered body 3 a may be composed of the anti-reflection layer 32 , an alignment film, and the first base material 31 . Oriented films generally contain polymer materials as main components. Representative examples of polymer materials include polyvinyl alcohol, polyimide, and derivatives thereof. In one embodiment of the present invention, it is preferably modified or unmodified polyvinyl alcohol. As the oriented film, for example, modified polyvinyl alcohol described in WO01/88574A1 and Japanese Patent No. 3907735 can be used. On behalf of the upper system, the orientation treatment is carried out on the orientation film. Typical examples of orientation treatment include rubbing treatment and photo-alignment treatment. Rubbing treatment is well known in the industry, and thus detailed description thereof will be omitted. As an alignment film (photo alignment film) subjected to photo-alignment treatment, for example, one described in WO2005/096041, a product name LPP-JP265CP manufactured by Rolic Technologies, etc. can be used. The thickness of the alignment film is, for example, 0.01 μm to 10 μm, preferably 0.01 μm to 1 μm, more preferably 0.01 μm to 0.5 μm.

The anti-mapping layer 32 can be formed by the following procedures, for example. First, a coating liquid for forming an alignment film is applied on the first substrate 31 and dried to form a coating film. The coating film is rubbed in a predetermined direction to form an alignment film on the first substrate 31 . The predetermined direction may correspond to the direction of the slow axis of the anti-mapping layer 32 to be obtained. Next, a coating solution for forming an anti-reflection layer (for example, a solution containing a liquid crystal compound and an optional crosslinkable monomer) is coated on the formed alignment film and heated. By heating, the solvent of the coating liquid is removed and the alignment of the liquid crystal compound is performed. Heating may be performed in one step, or may be performed in multiple steps while changing the temperature. Next, the crosslinkable (or polymerizable) monomer is crosslinked (or polymerized) by ultraviolet irradiation, and the orientation of the liquid crystal compound is fixed. According to the above operations, the anti-reflection layer 32 is formed on the first substrate 31 (substantially on the alignment film). In addition, a method of orienting a discotic liquid crystal compound is described in, for example, Japanese Patent Application Laid-Open No. 2014-214177, and a method of aligning a rod-shaped liquid crystal compound is described in, for example, Japanese Patent Application Laid-Open No. 2006-163343. In this specification, the descriptions of these publications are cited as a reference. In addition, the alignment film may be omitted depending on the desired alignment state, the type of liquid crystal compound, and the like.

C-2. The first substrate The first substrate 31 can be used to form the anti-reflection layer 32 .

Any appropriate resin film can be used as the first base material 31 . As the forming material of the resin film, for example, polyester resins such as polyethylene terephthalate (PET), cycloolefin resins such as northylene resins, cycloolefins (such as northylene) and α- Cellulosic resins such as resins obtained by addition polymerization of olefins (eg, ethylene) (COC), cellulose triacetate (TAC), etc. In one embodiment of the present invention, the first base material 31 includes a TAC-based resin.

The thickness of the first base material 31 can be appropriately set according to the purpose. The thickness of the first base material 31 is typically 20 μm to 200 μm, preferably 25 μm to 100 μm, more preferably 30 μm to 50 μm.

D. Reinforcing layer The reinforcing layer 5 imparts excellent resistance to local loads to the optical layered body 1 . In one embodiment of the present invention, the reinforcing layer 5 is attached to the first base material 31 through the second adhesive layer 62 . The reinforcing layer 5 is disposed between the second adhesive layer 62 and the third adhesive layer 63 . The reinforcing layer 5 is in contact with the second adhesive layer 62 and the third adhesive layer 63 , and is pressure-sensitively bonded to the second adhesive layer 62 and the third adhesive layer 63 .

The reinforcing layer 5 is formed of any appropriate film. Specific examples of the material constituting the main component of the reinforcing layer 5 include, for example, the same materials as the material constituting the main component of the protective layer 22 described in the above item B-2 (the above-mentioned transparent resin, the above-mentioned thermosetting resin, or ultraviolet curable resin). type resin, the above-mentioned glassy polymer and the above-mentioned resin composition). In one embodiment of the present invention, the reinforcing layer 5 includes a (meth)acrylic resin, preferably a (meth)acrylic resin having a glutarimide structure. That is, the protective layer 22 and the reinforcing layer 5 each contain a (meth)acrylic resin. By using a (meth)acrylic resin as the protective layer 22 and the reinforcing layer 5 , it is possible to stably suppress light leakage when a load of a predetermined value or more is locally applied to the optical layered body 1 .

Moreover, similarly to the protective layer 22, the said surface treatment and/or the said visibility-improving process may also be given to the reinforcement layer 5 as needed.

The thickness of the reinforcing layer 5 is typically 20 μm to 70 μm, preferably 30 μm to 50 μm. When the thickness of the reinforcing layer 5 is within the above-mentioned range, excellent resistance to local load can be imparted to the optical layered body 1, and warping of the optical layered body 1 in a high-humidity environment can be sufficiently suppressed.

E. The second optical function body The second optical functional body 4 can impart an optical function different from that of the first optical functional body 3 to the optical layered body 1 . As the second optical function body 4, for example, an antireflective laminate, a laminate corresponding to sunglasses, and the like may be mentioned. The thickness of the second optical functional body 4 is typically 40 μm to 120 μm, preferably 70 μm to 100 μm or less.

In one embodiment of the present invention, the second optical functional body 4 is an antireflection laminate 4a. The antireflection laminate 4 a includes a second base material 41 , a hard coat layer 42 disposed on the viewing side of the second base material 41 , and an antireflection layer 43 disposed on the viewing side of the hard coat layer 42 . That is, the antireflection laminate 4 a may be composed of the second base material 41 , the hard coat layer 42 and the antireflection layer 43 . The second base material 41 is disposed on the viewing side relative to the reinforcement layer 5 , and is bonded to the reinforcement layer 5 through the third adhesive layer 63 . The second substrate 41 is in contact with the third adhesive layer 63 and is pressure-sensitively bonded to the third adhesive layer 63 . In one embodiment of the present invention, the hard coat layer 42 is directly formed on the viewing-side surface of the second substrate 41 . In this specification, "directly" means not intervening an adhesive layer or an adhesive layer. In addition, the antireflection layer 43 is directly formed on the viewing side surface of the hard coat layer 42 .

E-1. Second substrate The second substrate 41 is used to form the hard coat layer 42 and the antireflection layer 43 . Any appropriate resin film can be used as the second base material 41 . As the forming material of the second base material 41, for example, the same material as the forming material of the first base material 31 described in the above-mentioned item C-2 (the above-mentioned polyester resin, the above-mentioned cycloolefin-based resin, the above-mentioned cycloolefin A resin obtained by addition polymerization with an α-olefin, and the above-mentioned cellulose-based resin). In one embodiment of the present invention, the second base material 41 contains TAC-based resin.

The thickness of the second base material 41 can be appropriately set according to the purpose. The thickness of the second base material 41 is typically 20 μm to 200 μm, preferably 50 μm to 150 μm, more preferably 70 μm to 90 μm.

E-2. Hard coating The hard coat layer 42 can impart excellent pencil hardness to the optical layered body 1 . Furthermore, by appropriately adjusting the difference in refractive index between the hard coat layer 42 and the antireflection layer 43, the reflectance of the optical laminate 1 can be further reduced.

The hard coat layer 42 preferably has sufficient surface hardness, excellent mechanical strength, and excellent light transmittance. The hard coat layer 42 may be formed of any appropriate resin as long as it has the above-mentioned desired characteristics. Specific examples of the resin include thermosetting resins, thermoplastic resins, ultraviolet curable resins, electron beam curable resins, and two-component mixed resins. Among the resins forming the hard coat layer 42, ultraviolet curable resins are preferable. When the resin is an ultraviolet curable resin, the hard coat layer 42 can be formed efficiently with simple operation.

Specific examples of ultraviolet-curable resins include polyester-based, acrylic-based, urethane-based, amide-based, silicone-based, and epoxy-based ultraviolet-curable resins. UV-curable resins include UV-curable monomers, oligomers, and polymers. As an ideal UV-curable resin, a resin composition including an acrylic monomer component or an oligomer component preferably having 2 or more, preferably 3 to 6 UV-polymerizable functional groups can be mentioned. Typically, a photopolymerization initiator is mixed with an ultraviolet curable resin.

The hard coat layer 42 can be formed by any suitable method. For example, the hard coat layer 42 can be formed by applying a resin composition for forming a hard coat layer on the second substrate 41 and drying it, and irradiating the dried coating film with ultraviolet rays to harden it.

The thickness of the hard coat layer 42 is, for example, 0.5 μm to 20 μm, preferably 1 μm to 15 μm.

Details of the hard coat layer and the adhesion structure of the hard coat layer and the antireflection layer are described in, for example, Japanese Patent Laid-Open No. 2016-224443. In this specification, the description of this publication is incorporated as a reference.

E-3. Anti-reflection layer The antireflection layer 43 is provided to prevent reflection of external light (for example, fluorescent lamps) and the like. Any appropriate configuration can be adopted as the configuration of the antireflection layer 43 . Typical configurations of the antireflection layer 43 include: (1) a single layer of a low-refractive index layer with an optical film thickness of 120 nm to 140 nm and a refractive index of about 1.35 to 1.55; A laminate having a medium refractive index layer, a high refractive index layer, and a low refractive index layer; (3) an alternating multilayer laminate of high refractive index layers and low refractive index layers.

Examples of materials that can form the low refractive index layer include silicon oxide (SiO ₂ ) and magnesium fluoride (MgF ₂ ). The refractive index of the low refractive index layer is typically about 1.35 to 1.55. Examples of materials that can form a high refractive index layer include titanium oxide (TiO ₂ ), niobium oxide (Nb ₂ O ₃ or Nb ₂ O ₅ ), tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO ), ZrO ₂ -TiO ₂ . The refractive index of the high refractive index layer is typically about 1.60 to 2.20. The material that can form the middle refractive index layer includes, for example, titanium oxide (TiO ₂ ), a mixture of a material that can form a low refractive index layer and a material that can form a high refractive index layer (such as a mixture of titanium oxide and silicon oxide). The refractive index of the middle refractive index layer is typically about 1.50 to 1.85. The thicknesses of the low-refractive-index layer, the medium-refractive-index layer, and the high-refractive-index layer can be set in such a way that an appropriate optical film thickness corresponding to the layer structure of the antireflection layer and the desired antireflection performance can be realized.

The anti-reflection layer 43 represents that the top line is formed by a dry process. Specific examples of the dry process include a PVD (Physical Vapor Deposition, physical vapor deposition) method and a CVD (Chemical Vapor Deposition, chemical vapor deposition) method. Examples of the PVD method include a vacuum vapor deposition method, a reactive vapor deposition method, an ion beam assist method, a sputtering method, and an ion plating method. As the CVD method, a plasma CVD method may be mentioned. The dry process for forming the anti-reflection layer 43 is preferably sputtering.

The thickness of the anti-reflection layer 43 is, for example, about 20 nm to 300 nm.

The difference between the maximum reflectance and the minimum reflectance of the anti-reflection layer 43 in the wavelength range of 400 nm to 700 nm is preferably 2.0% or less, more preferably 1.9% or less, more preferably 1.8% or less. When the difference between the maximum reflectance and the minimum reflectance is within the above-mentioned range, coloring of reflected light can be prevented favorably.

In one embodiment of the present invention, the antireflection layer 43 is located on the outermost surface of the optical layered body 1 on the viewing side. The moisture permeability of the antireflection layer 43 is typically not more than 1.0 g/mm ² , preferably not more than 0.1 g/mm ² , and typically not less than 0.01 g/mm ² . In addition, the moisture permeability can be determined according to the moisture permeability test (moisture permeability cup method) of JIS Z0208. The ^amount of water vapor ( g) to measure. When the water vapor transmission rate of the antireflection layer 43 located on the outermost surface is not more than the above-mentioned upper limit, the warping of the optical layered body 1 in a high-humidity environment can be more stably suppressed.

In addition, the antireflection layer 43 does not need to be located on the outermost surface of the optical layered body 1 . The antireflection laminate 4a may be provided with an outermost layer on the viewing side of the antireflection layer 43 as required. That is, the antireflection laminate 4a may be composed of the second base material 41, the hard coat layer 42, the antireflection layer 43, and the outermost layer. The range of moisture permeability of the outermost layer is the same as that of the above-mentioned anti-reflection layer 43 . As the outermost layer, an antifouling layer may be mentioned, for example. The antifouling layer includes, for example, a fluorine-containing silane compound (such as an alkoxysilane compound having a perfluoropolyether group) or a fluorine-containing organic compound. The antifouling layer should show water repellency with a water contact angle of 110 degrees or more.

F. The first adhesive layer, the second adhesive layer and the third adhesive layer Each of the first adhesive layer 61, the second adhesive layer 62, and the third adhesive layer 63 is formed of an adhesive (pressure-sensitive adhesive). More specifically, the first adhesive layer 61 is formed by applying an adhesive on the protective layer 22 of the polarizing plate 2 so as to have the aforementioned thickness. The second adhesive layer 62 is formed by applying an adhesive on the first base material 31 of the first optical functional body 3 so as to have the aforementioned thickness. The third adhesive layer 63 is formed by applying an adhesive on the reinforcing layer 5 so as to have the aforementioned thickness. The first adhesive layer 61, the second adhesive layer 62, and the third adhesive layer 63 may be formed of the same adhesive or different adhesives. In one embodiment of the present invention, the first adhesive layer 61, the second adhesive layer 62, and the third adhesive layer 63 are formed of the same adhesive. When the first adhesive layer 61 , the second adhesive layer 62 , and the third adhesive layer 63 are formed of the same adhesive, it is possible to reduce the manufacturing cost of the optical layered body 1 .

Adhesives typically contain (meth)acrylic polymers, urethane polymers, silicone polymers or rubber polymers as base polymers. When a (meth)acrylic polymer is used as the base polymer, the adhesive layer is formed of, for example, an adhesive containing a (meth)acrylic polymer.

F-1. (meth)acrylic polymer A (meth)acrylic polymer is a polymer containing a monomer component (raw material monomer) mainly composed of an alkyl (meth)acrylate. In other words, the (meth)acrylic polymer includes a structural unit derived from an alkyl (meth)acrylate. Alkyl (meth)acrylate is preferably 50% by weight or more in all monomer components used as raw materials for (meth)acrylic polymers, and it can be used as monomers other than alkyl (meth)acrylate. The rest can be set arbitrarily. In addition, (meth)acrylate means acrylate and/or methacrylate.

Examples of the alkyl (meth)acrylate constituting the main skeleton of the (meth)acrylic polymer include linear or branched alkyl (meth)acrylates having 1 to 18 carbon atoms. . Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, cyclohexyl, heptyl, 2-ethylhexyl, isooctyl, nonyl decyl, isodecyl, dodecyl, isomyristyl, lauryl, tridecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, etc. Alkyl (meth)acrylates may be used alone or in combination. The average carbon number of the alkyl group is preferably 3-10.

The (meth)acrylic polymer may contain, in addition to structural units derived from alkyl (meth)acrylates, structural units derived from comonomers polymerizable with alkyl (meth)acrylates. That is, the monomer component used as a raw material of a (meth)acrylic-type polymer may further contain a comonomer other than an alkyl (meth)acrylate.

Examples of comonomers include carboxyl group-containing monomers, hydroxyl group-containing monomers, amine group-containing monomers, amide group-containing monomers, cyclopolymerizable monomers, epoxy group-containing monomers, and sulfonic acid group-containing monomers. Monomers containing phosphoric acid groups, polyfunctional acrylates, (meth)acrylates with alicyclic hydrocarbon groups, (meth)acrylates with aromatic hydrocarbon groups, vinyl esters, aromatic vinyl compounds, dienes Classes, vinyl ethers, vinyl chloride, etc. Comonomers may be used alone or in combination.

Among the above-mentioned comonomers, reactive group-containing monomers having a reactive group capable of reacting with a crosslinking agent described later are suitably mentioned, and carboxyl group-containing monomers and hydroxyl group-containing monomers are more preferably mentioned. When the adhesive contains a cross-linking agent described later, the reactive group-containing monomer will become a reaction point with the cross-linking agent. Carboxyl-containing monomers and hydroxyl-containing monomers are rich in reactivity with intermolecular cross-linking agents, so they can be suitably used to improve the cohesion or heat resistance of the obtained adhesive layer. Moreover, the carboxyl group-containing monomer is preferable from the point of view of both durability and reworkability, and the hydroxyl group-containing monomer is preferable from the point of view of improvement of reworkability. A comonomer can be used individually or in combination among the raw material monomers of a (meth)acrylic-type polymer.

A carboxyl group-containing monomer is a compound containing a carboxyl group in its structure and a polymerizable unsaturated double bond such as a (meth)acryl group or a vinyl group. As a carboxyl group-containing monomer, (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid etc. are mentioned, for example. Among these, acrylic acid is preferable. The (meth)acrylic polymer may suitably contain a structural unit derived from a carboxyl group-containing monomer, preferably a structural unit derived from (meth)acrylic acid. If the (meth)acrylic polymer contains a structural unit derived from a carboxyl group-containing monomer, the adhesive property of the adhesive layer can be improved.

When using a carboxyl group-containing monomer as a raw material monomer, the content of the carboxyl group-containing monomer is usually 0.01% by weight or more and 10% by weight or less in all monomer components used as a raw material for the (meth)acrylic polymer.

A compound containing a hydroxyl group in its structure and a polymerizable unsaturated double bond such as a (meth)acryl group or a vinyl group. Examples of hydroxyl-containing monomers include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxybutyl (meth)acrylate, Hydroxyalkyl (meth)acrylates such as hydroxyhexyl ester, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, etc.; Acrylic acid (4 -Hydroxymethylcyclohexyl) methyl ester, etc. Among them, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferable, and 4-hydroxybutyl (meth)acrylate is more preferable. The (meth)acrylic polymer may suitably contain structural units derived from hydroxyl-containing monomers, preferably 2-hydroxyethyl (meth)acrylate and/or 4-hydroxybutyl (meth)acrylate. Structural units. If the (meth)acrylic polymer contains structural units derived from hydroxyl-containing monomers, the durability of the adhesive layer can be improved.

When a hydroxyl group-containing monomer is used as a raw material monomer, the content of the hydroxyl group-containing monomer is usually 0.01% by weight or more and 10% by weight or less in all monomer components used as a raw material for the (meth)acrylic polymer.

The weight average molecular weight Mw of the (meth)acrylic polymer is, for example, 200,000 to 3 million, preferably 1 million to 2.5 million, more preferably 1.2 million to 2.5 million. When the weight average molecular weight Mw is within the above range, an adhesive layer excellent in durability (especially heat resistance) can be obtained. When the weight-average molecular weight Mw exceeds 3 million, a viscosity increase and/or gelation during polymer polymerization may occur.

F-2. Cross-linking agent The adhesive may contain a crosslinking agent. As a crosslinking agent, an organic crosslinking agent, a polyfunctional metal chelate compound, etc. can be used. As an organic type crosslinking agent, an isocyanate type crosslinking agent, a peroxide type crosslinking agent, an epoxy type crosslinking agent, an imine type crosslinking agent is mentioned, for example. Multifunctional metal chelates are covalently bonded or coordinately bonded between polyvalent metals and organic compounds. When the adhesive is a radiation curing type, a polyfunctional monomer can be used as a crosslinking agent. The crosslinking agents can be used alone or in combination. The cross-linking agent preferably includes an isocyanate-based cross-linking agent and a peroxide-based cross-linking agent.

When a crosslinking agent is blended into the adhesive, the blending amount of the crosslinking agent is usually 0.01 to 15 parts by weight relative to 100 parts by weight of the (meth)acrylic polymer (base polymer). When blending an isocyanate-based cross-linking agent into the adhesive, the amount of the isocyanate-based cross-linking agent is usually 0.01 to 15 parts by weight, preferably 1.0 parts by weight, relative to 100 parts by weight of the (meth)acrylic polymer. 10 parts by weight, preferably 2.5 parts by weight to 5 parts by weight. When a peroxide-based crosslinking agent is blended into the adhesive, the amount of the peroxide-based crosslinking agent is usually 0.01 to 2 parts by weight relative to 100 parts by weight of the (meth)acrylic polymer. It is preferably 0.1 to 0.5 parts by weight. When the compounding ratio of the crosslinking agent (isocyanate crosslinking agent and peroxide crosslinking agent) is within the above range, a monomer containing a reactive group is included in the raw material monomer component of the (meth)acrylic polymer In this case, the modulus of elasticity of the adhesive layer described later can be smoothly adjusted to a desired range.

F-3. Silane coupling agent with reactive functional groups The adhesive may contain a silane coupling agent containing reactive functional groups. The reactive functional groups of the silane coupling agent containing reactive functional groups are typically functional groups other than acid anhydride groups. Examples of functional groups other than acid anhydride groups include epoxy groups, mercapto groups, amine groups, isocyanate groups, isocyanate groups, vinyl groups, styryl groups, acetylacetyl groups, ureido groups, thiourea groups, ( Meth)acryl, heterocyclyl and combinations thereof. Silane coupling agents containing reactive functional groups can be used alone or in combination.

When a silane coupling agent containing a reactive functional group is blended into the adhesive, the blending amount of the silane coupling agent containing a reactive functional group is usually 0.001 parts by weight or more relative to 100 parts by weight of the (meth)acrylic polymer And 5 parts by weight or less.

F-4. Additives The adhesive may also contain a (meth)acrylic oligomer and/or an ionic compound. In addition, the adhesive may contain additives. Specific examples of additives include powders such as colorants and pigments, dyes, surfactants, plasticizers, thickeners, surface lubricants, leveling agents, softeners, antioxidants, antiaging agents, optical Stabilizers, UV absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, granules, foils. Also, within a controllable range, a redox system in which a reducing agent is added can also be used. In addition, the adhesive may also contain polyether compounds with reactive groups (such as reactive silicon groups). The type, quantity, combination, content, etc. of additives can be appropriately set according to the purpose. The content of the additive is preferably not more than 5 parts by weight, more preferably not more than 3 parts by weight, more preferably not more than 1 part by weight, based on 100 parts by weight of the (meth)acrylic polymer.

F-5. Characteristics of Adhesives The storage elastic modulus of the adhesive at 23° C. 55% RH is typically not less than 0.05 GPa, preferably not less than 0.11 GPa, and typically not more than 0.2 GPa, preferably not more than 0.15 GPa. In addition, the storage elastic modulus can be measured in accordance with JIS K 7244 using a dynamic viscoelasticity measuring device "ARES" manufactured by Rheometric Corporation. When the modulus of elasticity of the adhesive is in the above range, the resistance of the optical layered body 1 to local load can be further improved.

G. The first retardation layer The first retardation layer 7 may be constituted by a retardation film having any appropriate optical and/or mechanical characteristics according to the purpose. The first retardation layer 7 is located on the opposite side of the polarizer 2 to the viewing side. The first retardation layer 7 represents the upper side which is bonded on the opposite side of the polarizer 21 to the viewing side through any appropriate adhesive layer. The first retardation layer 7 may also serve as a protective layer on the side opposite to the viewing side of the polarizer 21 .

The thickness of the first retardation layer 7 is preferably 10 μm to 60 μm, more preferably 30 μm to 50 μm.

The in-plane retardation Re(550) of the first retardation layer 7 is preferably 80nm~150nm, more preferably 90nm~140nm, more preferably 100nm~130nm.

As described above, the first retardation layer 7 preferably exhibits the relationship of nx>ny>nz in terms of refractive index characteristics. The Nz coefficient of the first retardation layer 7 is preferably 1.1-3.0, more preferably 1.3-2.7.

The first retardation layer 7 can be suitably arranged such that its slow axis is substantially parallel to the absorption axis of the polarizer 21 . In this specification, the expressions "substantially parallel" and "approximately parallel" include the case where the angle formed by the two directions is 0°±7°, preferably 0°±5°, more preferably 0°±3°. The expressions "substantially orthogonal" and "approximately orthogonal" include the case where the angle formed by the two directions is 90°±7°, preferably 90°±5°, more preferably 90°±3°. Furthermore, when only "orthogonal" or "parallel" is mentioned in this specification, it is assumed that a substantially orthogonal or substantially parallel state can be included.

The absolute value of the photoelastic coefficient included in the first retardation layer 7 is preferably 2×10 ^-11 m ² /N or less, more preferably 2.0×10 ^-13 m 2 /N to 1.5× ^{10 -11} m ² / ^N , more preferably It is preferably a resin of 1.0×10 ^-12 m ² /N~1.2×10 ^-11 m ² /N. When the absolute value of the photoelastic coefficient is in the above-mentioned range, a phase difference change is less likely to occur when shrinkage stress during heating is generated. Therefore, by forming the first retardation layer 7 using a resin having the absolute value of the photoelastic coefficient, heat unevenness can be prevented favorably when the optical layered body 1 is applied to an image display device.

The first retardation layer 7 can exhibit inverse dispersion wavelength characteristics in which the retardation value becomes larger with the wavelength of the measuring light, can display normal wavelength dispersion characteristics in which the retardation value becomes smaller with the wavelength of the measuring light, and can also exhibit almost no retardation value. Flat wavelength dispersion characteristics that vary with the wavelength of the measurement light. The first retardation layer 7 preferably exhibits flat wavelength dispersion characteristics. Specifically, Re(450)/Re(550) of the first retardation layer 7 is preferably 0.99-1.03, and Re(650)/Re(550) is preferably 0.98-1.02. By arranging the λ/2 plate (first retardation layer) and the λ/4 plate (second retardation layer) with flat wavelength dispersion characteristics at a predetermined axis angle, it is possible to obtain an ideal inverse wavelength dispersion characteristic. characteristics, resulting in very excellent anti-reflection characteristics.

The first retardation layer 7 may be formed of any appropriate resin film that satisfies the above characteristics. Representative examples of such resins include cyclic olefin-based resins, polycarbonate-based resins, cellulose-based resins, polyester-based resins, polyvinyl alcohol-based resins, polyamide-based resins, and polyimide-based resins. , Polyether resin, polystyrene resin, acrylic resin. Among these, cyclic olefin-based resins can be suitably used. The first retardation layer 7 can be obtained, for example, by stretching a film formed of the above-mentioned resin. The details of the stretching method of the cyclic olefin-based resin and the resin film (the method of forming the retardation film) are described in, for example, JP-A-2015-210459 and JP-A-2016-105166. In this specification, the description of this publication is incorporated as a reference.

H. The second retardation layer The second retardation layer 8 may be composed of a retardation film having any appropriate optical and/or mechanical characteristics according to the purpose. The second retardation layer 8 is located on the side opposite to the viewing side of the first retardation layer 7 . The second retardation layer 8 represents the upper side that is bonded to the opposite side of the first retardation layer 7 from the viewing side through any appropriate adhesive layer.

The thickness of the second retardation layer 8 is preferably 10 μm to 50 μm, most preferably 20 μm to 40 μm.

The in-plane retardation Re(550) of the second retardation layer 8 is preferably 10 nm to 60 nm, more preferably 20 nm to 50 nm, more preferably 30 nm to 40 nm.

As described above, the second retardation layer 8 preferably exhibits the relationship of nz>nx>ny in terms of refractive index characteristics. The Nz coefficient of the second retardation layer 8 is preferably -10~-0.1, more preferably -5~-1.

The second retardation layer 8 can be suitably arranged such that its slow axis is substantially perpendicular to the absorption axis of the polarizer 21 .

The second retardation layer 8 may be composed of any appropriate resin film that satisfies the above characteristics. As the resin, typically, a polymer having negative intrinsic birefringence may be used. A polymer having negative intrinsic birefringence means that when the polymer is oriented by stretching or the like, the refractive index in the oriented direction becomes relatively small. Examples of polymers having negative intrinsic birefringence include polymers in which chemical bonds or functional groups with large polarization anisotropy, such as aromatic or carbonyl groups, are introduced into side chains of the polymer. Specific examples include modified polyolefin-based resins (for example, modified polyethylene-based resins), acrylic resins, styrene-based resins, maleimide-based resins, and fumarate-based resins. The second retardation layer 8 can be obtained, for example, by appropriately stretching a film formed of the aforementioned resin.

In addition, in one embodiment of the present invention, the optical layered body 1 includes the first retardation layer 7 and the second retardation layer 8, but the optical layered body may not include the first retardation layer and/or the second retardation layer.

I. Adhesive layer on panel side The panel-side adhesive layer 9 is located on the side opposite to the viewing side of the second retardation layer 8 . The panel-side adhesive layer 9 is typically formed by coating any appropriate adhesive on the second retardation layer 8 . The thickness of the adhesive layer 9 on the panel side is preferably 1 μm to 60 μm, more preferably 5 μm to 30 μm. Moreover, in one embodiment of the present invention, the optical layered body 1 includes the panel side adhesive layer 9, but the optical layered body does not need to include the panel side adhesive layer.

J. Image display device The optical laminates described in items A to I above can be applied to image display devices. Therefore, one embodiment of the present invention also includes an image display device using the optical layered body. Representative examples of video display devices include liquid crystal display devices and organic EL display devices. The image display device of the embodiment of the present invention is typically equipped with the optical layered body described in the above items A to I on the viewing side. The image display device includes an image display panel. The image display panel includes an image display unit. In addition, an image display device may be referred to as an optical display device, an image display panel may be referred to as an optical display panel, and an image display unit may be referred to as an optical display unit.

Example The following examples illustrate the present invention in detail, but the present invention is not limited by these examples. In addition, the measurement method of each characteristic is as follows.

(1) orange peel The optical laminates obtained in Examples and Comparative Examples were cut out to a size of 200 mm×300 mm, and used as test samples. In the test sample, the direction of the absorption axis of the polarizer (MD direction) is parallel to the width direction of the test sample (direction perpendicular to the longitudinal direction). Next, this test sample was bonded to a black acrylic plate using the panel-side adhesive layer. On the surface of the visible side of the test sample attached to the acrylic plate, use a fluorescent lamp to make light incident so that the reflection angle becomes 45°~70°, and observe the appearance of the test sample with the naked eye (visual side surface). The results were evaluated according to the benchmarks described below. A: Inconspicuous unevenness B: obvious unevenness C: very obvious unevenness

(2) Puncture test The optical laminates obtained in Examples and Comparative Examples were cut out to a size of 5 cm x 5 cm and used as test samples. Next, this test sample was bonded to a glass plate with a thickness of 1.2 mm using the panel side adhesive layer. The test sample bonded to the glass plate was placed on the stage of an Indenter CMS testing machine (manufactured by INSTRON, product name: 5581) equipped with a puncture jig. The radius of curvature R of the front end of the puncture jig was 500 μm. At room temperature (23°C±3°C), use the puncture jig with a load of 9kg to puncture the test sample on the stage. The light leakage when the optical laminate after the puncture test and the standard polarizing plate are arranged so that the polarizer of the optical laminate and the polarizer of the standard polarizing plate are in a state of crossed polarization is observed with the naked eye, and evaluated according to the following criteria. A: No light leakage was confirmed. B: It was confirmed that there was light leakage at a level that might affect practically. C: Light leakage is conspicuous to such an extent that it is practically unacceptable.

(3) Warping under high humidity environment The optical laminates obtained in Examples and Comparative Examples were cut out to a size of 200 mm×300 mm, and used as visual recognition side samples. In the viewing side sample, the absorption axis direction (MD direction) of the polarizer is parallel to the width direction (orthogonal direction to the longitudinal direction) of the viewing side sample. Next, this visibility-side sample was bonded to the surface of the glass plate using the panel-side adhesive layer. The glass plate has dimensions of 210 mm×310 mm, and the thickness of the glass plate is 550 μm. Also, the laminate obtained in the production example was cut out to a size of 200 mm×300 mm, and used as a light source side sample. In the light source side sample, the absorption axis direction (MD direction) of the polarizer is parallel to the long side direction of the light source side sample. Next, this light source side sample was bonded to the back surface of the glass plate with the adhesive layer. In this way, a test sample obtained by laminating the viewing side sample, the glass plate, and the light source side sample was obtained. Next, the test sample was autoclaved under normal conditions (50°C, 5 atm) for 15 minutes, then left to stand at 23°C at 55%RH for 48 hours, and then at 65°C at 90%RH. Leave for 48 hours. Then, the shape of the test sample was observed with the naked eye, and evaluated according to the following criteria. A: When the backlight-side polarizing plate (sample on the light source side) is turned downward and the shape is observed, it has a concave shape. B: When the backlight-side polarizing plate (sample on the light source side) is turned downward and the shape is observed, it has a convex shape. In addition, when the test sample after the high-humidity test has a convex shape, it is understood that the upper viewing side sample (the optical laminate of the example and the comparative example) is smaller than the lower light source side sample (the laminate of the manufacturing example). ) is more expanded, and the specimen on the viewing side is warped. On the other hand, when the test sample after the high-humidity test has a concave shape, it is understood that the light source-side sample on the lower side (the laminate in the manufacturing example) is lower than the visual-visibility-side sample on the upper side (implementation) in a high-humidity environment. The optical laminates of Examples and Comparative Examples) were more expanded, and the warping of the samples on the viewing side was suppressed.

[manufacturing example 1] A polarizing plate was obtained in the same manner as in "1. Production of a polarizing plate (polarizer laminate)" described later. Also, an acrylic adhesive (adhesive PSA2 to be described later) was applied to the surface of the polarizer opposite to the protective layer to form an adhesive layer. The thickness of the adhesive layer is 20 μm. In addition, on the surface of the protective layer (acrylic resin film) opposite to the polarizer, a reflective polarizer film (product name: APF-T35) manufactured by 3M was attached through an acrylic adhesive (adhesive PSA3 described later). , thickness: 38 μm). Thereby, an adhesive layer is formed between the acrylic resin film and the reflective polarizer film. The thickness of the adhesive layer is 12 μm. In the above manner, a laminate having a composition of adhesive layer/polarizing plate/adhesive layer/reflective polarizer film was obtained. ＜Preparation of Adhesive PSA2＞ Add 99 parts of butyl acrylate, 1.0 part of 4-hydroxybutyl acrylate and 2,2'-azobisisobutyronitrile together with ethyl acetate into a reaction vessel equipped with a cooling tube, a nitrogen gas inlet tube, a thermometer and a stirring device 0.3 parts, after reacting at 60° C. for 4 hours under a nitrogen stream, ethyl acetate was added to the reaction solution to obtain a solution containing acrylic polymer A2 with a weight average molecular weight of 1.65 million (solid content concentration: 30% by weight) . 0.3 parts of dibenzoyl peroxide (manufactured by NOF Corporation: NYPER BMT), 0.1 part of trimethylolpropane xylene diisocyanate ( Mitsui Takeda Chemical Co., Ltd.: TAKENATE D110N) and 0.2 parts of silane coupling agent (Soken Chemical Co., Ltd.: A-100, silane coupling agent containing acetoacetyl group) to obtain acrylic adhesive PSA2. ＜Preparation of Adhesive PSA3＞ 100 parts of butyl acrylate, 5 parts of acrylic acid, and 0.1 part of 2-hydroxyethyl acrylate were fed together with 100 g of ethyl acetate into a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler as a polymerization initiator. 0.1 part of 2,2'-azobisisobutyronitrile, while slowly stirring and introducing nitrogen gas for nitrogen replacement, keep the liquid temperature in the flask at around 55°C, and carry out polymerization reaction for 8 hours to obtain a weight-average molecular weight 2.2 million solution of acrylic polymer A3. 0.60 parts of isocyanate crosslinking agent (manufactured by Tosoh Co., Ltd., CORONATE L) and 0.20 parts of silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., KBM403) were blended with 100 parts of solid content of the obtained acrylic polymer A3 solution , Acrylic adhesive PSA3 of a solution (11% by weight of solid content) of the acrylic adhesive composition was obtained.

[Example 1~3] 1. Production of polarizing plate (polarizer laminate) As the thermoplastic resin substrate, a long amorphous isophthalic acid copolymerized polyethylene terephthalate film (thickness: 100 μm) with a Tg of about 75°C is used, and corona treatment is performed on one side of the resin substrate . PVA-based resin made by mixing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mole%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER") at a ratio of 9:1 13 parts by weight of potassium iodide was added to 100 parts by weight, and the resulting mixture was dissolved in water to prepare an aqueous PVA solution (coating solution). The above-mentioned PVA aqueous solution was coated on the corona-treated surface of the resin substrate and dried at 60° C. to form a PVA-based resin layer with a thickness of 13 μm, thereby producing a laminate. The obtained laminate was uniaxially stretched to 2.4 times in the longitudinal direction (longitudinal direction) in an oven at 130°C (in-air assisted stretching treatment). Next, the laminated body was immersed for 30 seconds in an insoluble bath (an aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 40° C. (insoluble treatment). Next, immerse in a dyeing bath (iodine aqueous solution obtained by mixing iodine and potassium iodide at a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30°C for 60 seconds while adjusting the concentration, To make the single-body transmittance (Ts) of the final obtained polarizer a desired value (dyeing treatment). Next, it was immersed for 30 seconds in a crosslinking bath (a boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 40° C. (crosslinking treatment). Then, while immersing the laminated body in a boric acid aqueous solution (boric acid concentration: 4% by weight, potassium iodide concentration: 5% by weight) at a liquid temperature of 70°C, uniaxial stretching was carried out in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds. Make the total elongation ratio reach 5.5 times (extension treatment in water). Then, the laminate was immersed in a cleaning bath (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 20° C. (washing treatment). Then, while drying in an oven kept at about 90° C., the contact surface temperature was kept at about 75° C. with a heating roller made of SUS (drying shrinkage treatment). In the manner described above, a polarizer with a thickness of about 5 μm was formed on the resin substrate. On the surface of the obtained polarizer (the surface opposite to the resin substrate), an acrylic resin film (thickness: 40 μm) having a glutarimide structure was bonded as a protective layer through a UV-curable adhesive. Specifically, it applied so that the total thickness of the hardening adhesive might become about 2.0 micrometers, and bonded together using the roll mill. Then, UV light was irradiated from the side of the acrylic resin film to cure the adhesive. Next, the resin substrate was peeled off to obtain a polarizing plate having a structure of acrylic resin film (protective layer)/polarizer.

2. Anti-mapping laminate As the anti-reflection laminate, a TAC film with a retardation layer manufactured by FUJIFILM Co., Ltd. (product name: HL214, thickness: 42 μm) was used.

3. Production of anti-reflection laminates As the antireflection laminate, an AR film (AR+HC thickness: 4 μm, substrate thickness: 80 μm) manufactured by Dexerials Co., Ltd. was used.

4. Modulation of adhesive 4-1. Preparation of adhesive PSA1 used for the 1st adhesive layer~3rd adhesive layer and the panel side adhesive layer A monomer mixture containing 94.9 parts of butyl acrylate, 0.1 part of 4-hydroxybutyl acrylate and 5.0 parts of acrylic acid was fed into a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a cooler. Furthermore, 0.1 part of 2,2'-azobisisobutyronitrile was fed as a polymerization initiator with 100 parts of ethyl acetate with respect to 100 parts of this monomer mixture, and nitrogen gas was introduced while slowly stirring to carry out nitrogen replacement. The liquid temperature in the flask was kept around 55° C., and the polymerization reaction was carried out for 8 hours to prepare a solution of acrylic polymer A1 with a weight average molecular weight (Mw) of 2.2 million and Mw/Mn=3.0. With respect to 100 parts of solid content of the acrylic polymer A1 solution, 3 parts of trimethylolpropane/cresyl diisocyanate adduct (manufactured by Tosoh, trade name "CORONATE L"), peroxide cross-linked 0.2 part of agent (benzoyl peroxide), 0.075 part of silane coupling agent containing epoxy group (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "KBM-403"), and polyether compound with reactive silicon group (Kaneka Company-manufactured, brand name "Silyl SAT10") 0.5 part, and adhesive agent PSA1 was obtained. The storage modulus of the adhesive constituting the adhesive layer was measured based on JIS K 7244 using a dynamic viscoelasticity measuring device "ARES" manufactured by Rheometric Corporation. The storage elastic modulus of the adhesive PSA1 at 23°C and 55%RH is 0.11GPa.

5. Production of optical laminates The anti-reflection laminate is pasted on the protective layer of the polarizing plate through the adhesive PSA1. Specifically, an adhesive PSA1 was applied to the surface of the protective layer on the viewing side to form a first adhesive layer having a thickness shown in Table 1, and then the antireflection layer of the antireflection laminate was bonded with the first adhesive The layers are in contact, and the antireflection laminate is bonded to the polarizing plate through the first adhesive layer. At this time, it was adjusted so that the slow axis of the anti-reflection layer (orientation solidified layer of the liquid crystal compound) formed an angle of 45° with respect to the absorption axis of the polarizer. Next, an acrylic resin film (thickness: 40 μm) having a glutarimide structure was pasted on the first base material of the anti-reflection laminate through the adhesive PSA1 as a reinforcing layer. Specifically, the adhesive PSA1 was applied to the surface of the first substrate on the viewing side to form a second adhesive layer having the thickness shown in Table 1, and the reinforcing layer was attached to the second adhesive layer in contact with the second adhesive layer. Suitable for anti-mapping laminates. Next, the anti-reflective laminate is pasted on the reinforcing layer through the adhesive PSA1. Specifically, the adhesive PSA1 was applied to the surface of the reinforcement layer on the viewing side to form a third adhesive layer having the thickness shown in Table 1, and then the second base material and the second adhesive layer of the antireflective laminate were adhered. The anti-reflective laminate is bonded to the reinforcing layer through the third adhesive layer. Also, on the surface of the polarizer opposite to the protective layer, a cyclic olefin film (refractive index characteristic: nx>ny>nz, in-plane retardation: 116nm). At this time, it was adjusted so that the slow axis of the first retardation layer formed an angle of 0° with respect to the absorption axis of the polarizer. Then, on the surface of the first retardation layer opposite to the polarizer, a modified polyethylene film (refractive index characteristics: nz>nx>ny, in-plane Phase difference: 35nm). At this time, it is adjusted so that the slow axis of the second retardation layer forms an angle of 90° with respect to the absorption axis of the polarizer. Next, the adhesive PSA1 was applied to the surface of the second retardation layer opposite to the first retardation layer to form a panel-side adhesive layer having a thickness shown in Table 1. In the above manner, an antireflection laminate/third adhesive layer/reinforcement layer/second adhesive layer/antireflection laminate/first adhesive layer/polarizing plate/first retardation layer/second An optical laminate consisting of a retardation layer/adhesive layer on the panel side. Table 1 shows the thickness of each layer included in the optical layered body, the total thickness of the optical layered body, and the total thickness of the antireflection layered body, reinforcing layer, and antireflection layered body. Also, the optical layered body was subjected to evaluation of the above-mentioned orange peel, puncture test (light leakage) and warpage in a high-humidity environment. The results are shown in Table 2 together with the total thickness of the anti-reflection laminate, the reinforcing layer and the anti-reflection laminate, and the thickness of each adhesive layer.

[Comparative example 1] Only the first adhesive layer was formed on the viewing side of the polarizing plate, and the thickness of the adhesive layer on the panel side was changed to the value shown in Table 1, except that it was carried out in the same manner as in Example 2 to obtain Up to an optical laminate having a composition of the first adhesive layer/polarizing plate/first retardation layer/second retardation layer/panel-side adhesive layer.

[Comparative example 2] Except that only the first adhesive layer and the anti-reflection laminate were formed on the viewing side of the polarizing plate, it was carried out in the same manner as in Comparative Example 1, and an anti-reflection laminate/first adhesive layer/polarizing plate/ An optical laminate consisting of the first retardation layer/second retardation layer/panel-side adhesive layer.

[Comparative example 3] Except that no reinforcing layer is provided between the anti-reflection laminate and the anti-reflection laminate, the anti-reflection laminate is bonded to the anti-reflection laminate through the second adhesive layer, and the same method as in Comparative Example 1 is carried out to obtain an anti-reflective laminate. Optical laminate composed of reflective laminate/second adhesive layer/antireflection laminate/first adhesive layer/polarizing plate/first retardation layer/second retardation layer/panel-side adhesive layer.

[Comparative example 4] Except that the thicknesses of the first adhesive layer, the second adhesive layer, the third adhesive layer, and the panel side adhesive layer were changed to the values shown in Table 1, it was carried out in the same manner as in Comparative Example 3, and obtained Optical laminate composed of antireflective laminate/second adhesive layer/antireflection laminate/first adhesive layer/polarizing plate/first retardation layer/second retardation layer/panel-side adhesive layer.

[Comparative Example 5] The second reinforcement layer and the fourth adhesive layer were provided between the third adhesive layer and the antireflective laminate, and the thickness of the adhesive layer on the panel side was changed to the value shown in Table 1. Carry out in the same manner as Example 2, and obtain an antireflective laminate/fourth adhesive layer/second reinforcing layer/third adhesive layer/reinforcing layer/second adhesive layer/antireflective laminate/first adhesive layer Optical laminate consisting of /polarizing plate/first retardation layer/second retardation layer/panel-side adhesive layer. In addition, the second reinforcing layer is an acrylic resin film (thickness: 40 μm) having a glutarimide structure. In addition, the fourth adhesive layer was formed by applying adhesive PSA1 to the surface of the second reinforcing layer on the viewing side so as to have the thickness shown in Table 1.

[Comparative Example 6] The thickness of the reinforcement layer was changed to 80 μm, and the thickness of the panel-side adhesive layer was changed to the value shown in Table 1, except that it was carried out in the same manner as in Example 2, and an antireflective laminate/third Optical laminate composed of adhesive layer/reinforcing layer/second adhesive layer/anti-reflection laminate/first adhesive layer/polarizing plate/first retardation layer/second retardation layer/panel-side adhesive layer .

[Comparative Example 7] The anti-reflection laminate was changed from a TAC film with a retardation layer (product name: HL214, thickness: 42 μm) manufactured by FUJIFILM Co., Ltd. to a polycarbonate anti-reflection film (thickness: 82 μm) manufactured by Nitto Denko Co., Ltd., and Except that the thickness of the adhesive layer on the panel side was changed to the value shown in Table 1, it was carried out in the same manner as in Example 2 to obtain an antireflective laminate/third adhesive layer/reinforcing layer/second adhesive Layer/anti-reflection laminate/first adhesive layer/polarizing plate/first retardation layer/second retardation layer/panel-side adhesive layer.

[Table 1]

[Table 2]

[Evaluate] As can be seen from Table 2, by setting the thickness of each adhesive layer to 17 μm or less, providing a reinforcement layer between the anti-reflection laminate and the anti-reflection laminate, and making the anti-reflection laminate, reinforcement layer, and anti-reflection laminate The total thickness is 200 μm or less, and an optical laminate that satisfies the suppression of cellulite, resistance to local loads, and warping in high-humidity environments can be obtained in a balanced manner.

Industrial availability The optical layered body of the present invention can be suitably used in image display devices (typically, liquid crystal display devices and organic EL display devices).

1: Optical laminate 2: polarizer 21: Polarizer 22: Protective layer 3: The first optical function body 3a: Anti-mapping laminate 31: 1st base material 32: Anti-mapping layer 4: The second optical function body 4a: Anti-reflection laminate 41: Second substrate 42: hard coating 43: Anti-reflection layer 5: Reinforcing layer 61: 1st adhesive layer 62: Second adhesive layer 63: The third adhesive layer 7: The first retardation layer 8: The second retardation layer 9: Adhesive layer on the panel side

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

1: Optical laminate

2: polarizer

21: Polarizer

22: Protective layer

3: The first optical function body

3a: Anti-mapping laminate

31: 1st base material

32: Anti-mapping layer

4: The second optical function body

4a: Anti-reflection laminate

41: Second substrate

42: hard coating

43: Anti-reflection layer

5: Reinforcing layer

61: 1st adhesive layer

62: Second adhesive layer

63: The third adhesive layer

7: The first retardation layer

8: The second retardation layer

9: Adhesive layer on the panel side

Claims (7)

An optical laminate comprising: Polarizer; The first optical functional body is attached to the viewing side of the polarizing plate through the first adhesive layer; a reinforcing layer, which is bonded to the viewing side of the first optical functional body through the second adhesive layer; and The second optical functional body is bonded to the viewing side of the reinforcing layer through the third adhesive layer; The respective thicknesses of the first adhesive layer, the second adhesive layer, and the third adhesive layer are 17 μm or less; The sum of the thickness of the first optical functional body, the thickness of the reinforcing layer, and the thickness of the second optical functional body is 200 μm or less. The optical laminate according to claim 1, wherein the first optical functional body is an anti-reflection laminate; The aforementioned anti-mapping laminates include: an anti-reflecting layer, which is in contact with the aforementioned first adhesive layer; and The first substrate is disposed on the viewing side of the anti-reflection layer and is in contact with the second adhesive layer. The optical laminate according to claim 1 or 2, wherein the second optical function body is an anti-reflection laminate; The aforementioned antireflection laminate includes: The second base material is in contact with the aforementioned third adhesive layer; a hard coat layer disposed on the viewing side of the aforementioned second substrate; and The anti-reflection layer is disposed on the viewing side of the aforementioned hard coat layer. The optical laminate according to claim 3, wherein the anti-reflection layer is located on the outermost surface of the optical laminate; and the moisture permeability of the anti-reflection layer is 0.1 g/mm ² or less. The optical laminate according to claim 1 or 2, wherein the polarizing plate includes: polarizer; with The protective layer is disposed on the viewing side of the aforementioned polarizer and is in contact with the aforementioned first adhesive layer. The optical laminate according to claim 5, wherein the thickness of the polarizer is 10 μm or less. The optical laminate according to claim 1 or 2, further comprising a first retardation layer and a second retardation layer arranged sequentially from the polarizing plate side on the side opposite to the viewing side of the polarizing plate; The aforementioned first retardation layer exhibits a refractive index characteristic of nx>ny>nz, The second retardation layer has a refractive index characteristic of nz>nx>ny.

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