TW201830106A - Optical laminate - Google Patents

Abstract

The present invention provides an optical laminate having two reflective polarizer layers, which is capable of suppressing the occurrence of rainbow unevenness even when disposed on the viewing side of a display device, and suitable as a half mirror capable of providing good visibility. The optical laminate includes a first reflection type polarizer layer, a second reflection type polarizer layer, and an intervening layer disposed between the first reflection type polarizer layer and the second reflection type polarizer layer, wherein the angle formed by the reflection axis of the first reflective polarizer layer and the reflection axis of the second reflective polarizer layer is 20DEG or more and 70DEG or less, and the haze is 0.4% or more and 20% or less.

Description

 Optical laminate  

The present invention relates to an optical laminate.

The general video display device displays an image on the screen while the power is turned ON, and turns black or gray when the power is turned OFF. In recent years, it has been proposed to use a screen in which the power is turned off (black display) as a display of a mirror (mirror). The mirror display includes a half mirror disposed on the identification side of the image display element, and the half mirror is disposed such that a screen in a state in which the power source is turned off can be used as a mirror and the power source is turned on. The image is displayed on the screen.

It is known to use a reflective polarizer as a half mirror. However, when only one reflective polarizer is used, the reflectance luminance under black display is about 50%, which is a limit, and it is difficult to obtain a clear image as a mirror. Therefore, it has been proposed to form a half mirror using a plurality of reflective polarizers (Patent Documents 1 and 2).

 [Previous Technical Literature]    [Patent Literature]  

[Patent Document 1] International Publication No. 2015/019858

[Patent Document 2] JP-A-2001-133769

Patent Document 1 discloses that a half mirror plate is formed by two reflective polarizing plates arranged so that the respective transmission axes intersect, thereby preventing a decrease in screen brightness in the display mode and improving the mirror mode. Reflectivity at the time (paragraphs [0010] and [0011]). However, it has been found that when the transmission axes of the two reflective polarizing plates are crossed to form a half mirror plate and placed on the identification side of the image display device, the light reflected by each of the reflective polarizing plates interferes to generate a rainbow pattern. In both the mirror mode and the display mode, the visibility is lowered.

Patent Document 2 describes a member in which two reflective polarizing plates (reflective polarizing filters) are stacked on the backlight side of a transflective liquid crystal display device. Further, in the same document, in order to prevent the occurrence of interference fringes (the same meaning as the above-described rainbow stripes), the above two reflective polarizing plates (paragraph [0056]) are followed. However, on the backlight side and the identification side, the influence of rainbow lines due to light interference is very different. When an optical layered body in which two reflective polarizing plates are bonded is provided on the backlight side, the optical layered body is recognized by the display device, and the rainbow pattern tends to be difficult to be recognized. On the other hand, when the optical layered body in which only two reflective polarizing plates are bonded is disposed on the identification side, the rainbow pattern of the optical layered body is directly observed, and the visibility is remarkable in both the mirror mode and the display mode. reduce.

An object of the present invention is to provide an optical laminate including two reflective polarizer layers, and to prevent the occurrence of rainbow lines even when disposed on the identification side of a display device, and is suitable as a semi-reflection which can obtain good visibility. The optical layer of the mirror.

The present invention provides an optical laminate shown below.

[1] The optical laminate includes a first reflective polarizer layer, a second reflective polarizer layer, and an intermediate layer disposed between the first reflective polarizer layer and the second reflective polarizer layer; The angle between the reflection axis of the first reflection type polarizer layer and the reflection axis of the second reflection type polarizer layer is 20° or more and 70° or less, and the haze is 0.4% or more and 20% or less.

[2] The optical layered product according to [1], which has a reflection luminance of 55% or more and 85% or less.

[3] The optical layered product according to [1], wherein the intermediate layer has a haze of 0.8% or more and 20% or less.

[4] The optical layered product according to any one of [1] to [3] wherein the intermediate layer contains two or more layers.

[5] The optical layered product according to [4], wherein the two or more layers have different hazes from each other.

[6] The optical layered product according to any one of [1] to [5], further comprising a substrate layer disposed outside the first reflective polarizer layer or outside the second reflective polarizer layer .

[7] The optical layered body according to [6], wherein the base material layer comprises an absorbing polarizer layer.

[8] The optical layered product according to any one of [1] to [7], further comprising an adhesive layer laminated on an outer surface of at least one of the first reflective polarizer layer and the second reflective polarizer layer Agent layer.

[9] The optical layered body according to any one of [1] to [8], which is disposed on the identification side of the display element.

An optical laminate including two reflective polarizer layers can be provided, and even when disposed on the identification side of the display device, generation of rainbow lines can be suppressed, and it is suitable as an optical laminate of a half mirror which can obtain good visibility. .

10‧‧‧1st reflective polarizer

20‧‧‧2nd reflective polarizer

30‧‧‧Intermediate

31‧‧‧Base film

32‧‧‧Haze imparting layer

40‧‧‧1st adhesive layer

50‧‧‧2nd adhesive layer

60‧‧‧3rd adhesive layer

70‧‧‧ substrate layer

80‧‧·score ball

81‧‧‧Light source

82‧‧‧Measurement samples

100, 200, 300, 400‧‧‧ optical laminates

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

Fig. 2 is a schematic cross-sectional view showing another example of the optical layered body of the present invention.

Fig. 3 is a schematic cross-sectional view showing still another example of the optical layered body of the present invention.

Fig. 4 is a schematic cross-sectional view showing still another example of the optical layered body of the present invention.

Fig. 5 is a schematic _cross- sectional view showing an optical system for measuring a visual reflectance R _SCI .

Hereinafter, the present invention will be described in detail by showing an embodiment.

In addition, in this specification, the description of "A to B" (A and B are numerical values) means "A or more B or less" unless otherwise indicated.

 <optical laminate>  

Fig. 1 is a schematic cross-sectional view showing an example of an optical layered body of the present invention. The optical layered body 100 shown in Fig. 1 can be suitably used as an optical member having a half mirror element having two reflective polarizer layers, and includes a first reflective polarizer layer 10 and a second reflective polarizer. The layer 20 is disposed in the intermediate layer 30 between the first reflective polarizer layer 10 and the second reflective polarizer layer 20. The first reflective polarizer layer 10 is laminated on one side surface of the intermediate layer 30 via the first adhesive layer 40. The second reflective polarizer layer 20 is laminated on the other side surface of the intermediate layer 30 via the second adhesive layer 50.

The angle formed by the reflection axis of the first reflection type polarizer layer 10 and the reflection axis of the second reflection type polarizer layer 20 (hereinafter also referred to as "relative angle of the reflection axis") is 20 to 70°, and the optical laminate 100 is The haze is from 0.4 to 20%. The haze of the optical layered body 100 is preferably 0.4 to 10%, more preferably 0.4 to 8%, still more preferably 0.5 to 6%, and may be 0.5 to 5%.

According to the optical layered body 100 having the above configuration, even when disposed on the identification side of the display device, the occurrence of rainbow lines can be effectively suppressed, and good visibility can be obtained. Here, the visibility includes setting the power of the display device to ON to display the screen in white (display mode), and using the display device as the visibility of the image when displaying the image on the screen; and When the screen is black, the screen is black (mirror mode), and the display device is used as a mirror. The optical layered body 100 having the above configuration can achieve such high visibility.

 (1) First reflective polarizer layer and second reflective polarizer layer  

Each of the first reflective polarizer layer 10 and the second reflective polarizer layer 20 may be, for example, an anisotropic reflective polarizer. An example of an anisotropic reflective polarizer is an isotropic multi-film that penetrates a linearly polarized light in a vibration direction and reflects a linearly polarized light in the other vibration direction. A specific example is "APF" and "DBEF" manufactured by 3M (refer to Japan) JP-A-4-268505, etc.). Another example of the anisotropic reflective polarizer is a composite of a cholesteric liquid crystal layer and a λ/4 plate, and a specific example thereof is "PCF" manufactured by Nitto Denko Corporation (refer to Japanese Laid-Open Patent Publication No. Hei 11-231130, etc.). Still another example of the anisotropic reflective polarizer is a reflective grid polarizer, and a specific example thereof is a metal grid reflective polarizer that performs fine processing on a metal to emit reflected polarized light even in a visible light region (nano-line grid polarized light) For example, a film in which a metal fine particle is added to a polymer matrix and stretched is disclosed (refer to Japanese Laid-Open Patent Publication No. Hei 8-184701, etc.).

The relative angle of the reflection axis is 20 to 70° from the viewpoint of improving the visibility of the display device and the like.

The relative angle of the reflection axis is preferably from 25 to 65°, more preferably from 30 to 60°, still more preferably from 35 to 55°. When the two reflection axes are crossed, two corners are formed. When the angle of one corner is α°, the angle of the other angle is (180-α)°. The relative angle of the reflection axis in the present specification means that the above two angles are small. That is, the minimum relative angle of the reflection axis that can be taken is 0°, and the maximum value that can be taken is 90°.

The thickness of the first reflective polarizer layer 10 and the second reflective polarizer layer 20 is usually 10 to 100 μm, preferably 10 to 50 μm from the viewpoint of reducing the thickness of the optical laminate 100 and the display device, and more preferably 10 to 30 μm.

At least one of the first reflective polarizer layer 10 and the second reflective polarizer layer 20 may have a surface treatment layer (coating layer) or an optical layer other than the reflective polarizer layer on the outer surface. The surface treatment layer is applied with a coating liquid containing a curable resin or the like, and a layer formed by drying treatment or hardening treatment is carried out as needed. The surface treatment layer may, for example, be a hard coat layer, an antiglare layer, a light diffusion layer, a retardation layer (a retardation layer having a phase difference of 1/4 wavelength, etc.), an antireflection layer, an antistatic layer, or an antifouling layer. Wait. By providing a surface treatment layer (coating layer) or other optical layer to impart an additional function to the optical layered body 100, the visibility of the display image when the optical layered body 100 is applied to a display device can be improved (including sharpness and external light). The reflection is difficult to see clearly, the homogeneity of the displayed image, the further improvement of the rainbow pattern, etc.).

The first reflective polarizer layer 10 and the second reflective polarizer layer 20 may have the same configuration, and may be different in thickness, material, layer configuration, optical characteristics, surface treatment layer, presence or absence of other optical layers, and the like. Further, in order to impart the above-described predetermined range of haze to the optical layered body 100, at least one of the first reflective polarizer layer 10 and the second reflective polarizer layer 20 may have a haze of not zero. The haze of the first reflective polarizer layer 10 and/or the second reflective polarizer layer 20 in this case is, for example, 0.1 to 5%. The first reflective polarizer layer 10 and the second reflective polarizer layer 20 may have the same haze value and may have different haze values.

The term "haze" refers to the ratio of the diffusion transmittance Td to the total light transmittance Tt, which is obtained by the following formula [A]: haze (%) = (Td / Tt) × 100 [A]. The total light transmittance Tt is the sum of the parallel light transmittance Tp and the diffused light transmittance Td which are coaxial with the incident light. It is measured in accordance with JIS K 7136:2000 "Method for Obtaining Haze of Plastic-Transparent Material".

 (2) Middle layer  

The intermediate layer 30 is a layer disposed between the first reflective polarizer layer 10 and the second reflective polarizer layer 20, and may have a single layer structure or a multilayer structure of two or more layers. In the case of a multilayer structure, two or more layers may have different hazes from each other. The intermediate layer 30 has a haze having a haze of not zero. The haze of the intermediate layer 30 is preferably from 0.1 to 20%, more preferably from 0.5 to 20%, still more preferably from 0.8 to 10%, still more preferably from 0.8 to 8%, particularly preferably from 1 to 8%. The use of the intermediate layer 30 having the haze in this range is suitable as one of the means for imparting the above-described predetermined range of haze to the optical layered body 100. When the haze of the intermediate layer 30 exceeds 20%, the black display (mirror mode) tends to lower the sharpness of the black display, and in the white display (display mode), the image becomes white, and the visibility tends to be lowered.

The method of imparting haze to the intermediate layer 30 is, for example, the following method.

a) The layer constituting the intermediate layer 30 is a method in which a layer (haze imparting layer) in which light-scattering particles are dispersed inside the layer is used.

b) The layer constituting the surface of the intermediate layer 30 is a method of using a layer having a surface unevenness (haze imparting layer).

c) Combination of a) and b) above.

The layer in which the light-scattering particles are dispersed inside the layer and the layer having the surface unevenness may be the same layer.

Fig. 2 is a schematic cross-sectional view showing another example of the optical layered body of the present invention. In the optical layered body 200 shown in Fig. 2, the intermediate layer 30 includes a base film 31 and a haze imparting layer 32 on which one surface is laminated. That is, in the example of Fig. 2, the intermediate layer 30 is mainly composed of a haze imparting layer 32 mainly exhibiting haze and a base film 31 supporting the same. In the example of Fig. 2, the haze imparting layer 32 is provided only on one surface of the base film 31, but the intermediate layer 30 provided on both surfaces of the base film 31 may have two or more haze imparting layers. Other layers (for example, an adhesive layer, an undercoat layer, a resin layer, etc.) may be provided between the base film 31 and the haze imparting layer 32.

The base film 31 can be made of, for example, a thermoplastic resin, and is preferably composed of a thermoplastic resin such as optical transparency. Specific examples of the thermoplastic resin include, for example, a polyolefin resin such as a chain polyolefin resin or a cyclic polyolefin resin (such as a decene-based resin); a polyester resin; and a (meth)acrylic resin. a cellulose ester resin such as cellulose triacetate or cellulose diacetate; a polycarbonate resin; a polyvinyl alcohol resin; a polyvinyl acetate resin; a polyarylate resin; Resin; polyether oxime resin; polyfluorene resin; polyamine resin; polyimine resin; and mixtures, copolymers and the like.

In the present specification, "(meth)acrylic acid" is used. Means to select at least one of acrylic acid and methacrylic acid. The same applies to "(meth)acrylonitrile" and "(meth)acrylate".

The chain-like polyolefin resin is, for example, a polyethylene resin (a polyethylene resin of a homopolymer of ethylene, a copolymer mainly composed of ethylene), a polypropylene resin (a polypropylene resin of a homopolymer of propylene, and a propylene resin). In addition to the homopolymer of the chain olefin which is a copolymer of the main component, for example, a copolymer composed of two or more kinds of chain olefins may be mentioned.

The cyclic polyolefin resin is a general term of a resin which is a polymerized unit of a cyclic olefin, and is described in, for example, JP-A No. 1-240517, JP-A No. 3-148882, and JP-A No. 3-122137. Resin. Specific examples of the cyclic polyolefin-based resin include a ring-opened (co)polymer of a cyclic olefin, an addition polymer of a cyclic olefin, and a copolymer of a cyclic olefin and a chain olefin such as ethylene or propylene ( Representative of a random copolymer) and such graft polymers modified with unsaturated carboxylic acids and derivatives thereof, and such hydrides. Among them, a norbornene-based resin having a norbornene-based monomer such as a norbornene or a polycyclic norbornene-based monomer as a cyclic olefin is preferably used.

The polyester resin is a resin having an ester bond in addition to the cellulose ester resin described below, and is generally a polycondensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol. As the polyvalent carboxylic acid or a derivative thereof, a divalent dicarboxylic acid or a derivative thereof can be used, and examples thereof include terephthalic acid, isophthalic acid, dimethyl terephthalate, and dimethyl naphthalene dicarboxylate. Wait. As the polyol, a divalent diol can be used, and examples thereof include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, and cyclohexanedimethanol. Representative examples of the polyester resin include polyethylene terephthalate which is a polycondensate of terephthalic acid and ethylene glycol.

The (meth)acrylic resin is a resin having a (meth)acryl fluorenyl group as a main constituent monomer. Specific examples of the (meth)acrylic resin include, for example, poly(meth)acrylate such as polymethyl methacrylate; methyl methacrylate-(meth)acrylic acid copolymer; methyl methacrylate-( Methyl) acrylate copolymer; methyl methacrylate-acrylate-(meth)acrylic acid copolymer; methyl (meth) acrylate-styrene copolymer (MS resin, etc.); methyl methacrylate and A copolymer of an alicyclic hydrocarbon group-containing compound (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate-methyl (meth) acrylate), and the like. Is preferably used such as poly (meth) acrylate of poly (meth) acrylic acid alkyl ester as a C _1-6 main component polymer, more preferably methyl methacrylate as a main component (50 to 100 wt. %, preferably 70 to 100% by weight of a methyl methacrylate-based resin.

The cellulose ester resin is an ester of cellulose and a fatty acid. Specific examples of the cellulose ester-based resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate. Further, these copolymers may be used, and a part of the hydroxyl group may be modified with other substituents. Among these, cellulose triacetate (triethylenesulfonyl cellulose) is particularly preferred.

The polycarbonate resin is an engineering plastic composed of a polymer in which a monomer unit is bonded via a carbonate group.

The thickness of the base film 31 is usually from 1 to 300 μm, and is preferably from 2 to 200 μm, more preferably from 5 to 150 μm, still more preferably from 5 to 100 μm, from the viewpoints of thinning of the optical layered body 100 and the display device and film strength. (for example, 80 μm or less).

The haze imparting layer 32 is obtained by applying a curable resin composition containing a curable resin to the base film 31, drying it as necessary, and curing the cured layer. The curable resin is, for example, an active energy ray-curable resin which is cured by irradiation with an active energy ray such as ultraviolet light, visible light, electron beam or X-ray, or a thermosetting resin which is cured by heat. In particular, from the viewpoint of productivity, hardness of the cured layer, and the like, the curable resin is preferably an active energy ray-curable resin, and the photocurable resin of the ultraviolet curable resin is more preferable.

However, the photocurable resin may be a visible light curable resin which is curable by visible light having a longer wavelength than ultraviolet light. Further, it is preferred that the curable resin is selected from a hardened material layer having a high hardness (hard coat layer). When a photocurable resin is used, the curable resin composition usually further contains a photopolymerization initiator.

The photocurable resin may, for example, be an amine ester (meth) acrylate, a polyhydric alcohol (meth) acrylate, or a (meth)acrylic polymer having an alkyl group having two or more hydroxyl groups. These (meth)acrylic compounds may be used alone or in combination of two or more kinds as needed.

The amine ester (meth) acrylate is preferably prepared by using (meth)acrylic acid and/or (meth) acrylate, a polyhydric alcohol, and a diisocyanate. For example, a hydroxy (meth) acrylate having at least one hydroxyl group is prepared from (meth)acrylic acid and/or (meth) acrylate and a polyhydric alcohol, and an amine ester can be obtained by reacting it with a diisocyanate ( Methyl) acrylate.

These (meth)acrylic acid and/or (meth) acrylate, a polyhydric alcohol, and a diisocyanate may be used alone or in combination of two or more.

Examples of the (meth) acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, and butyl (meth)acrylate. An alkyl (meth)acrylate; a cycloalkyl (meth)acrylate such as cyclohexyl (meth)acrylate.

The polyhydric alcohol is a compound having at least two hydroxyl groups, and examples thereof include ethylene glycol, 1,3-propanediol, 1,2-propanediol, diethylene glycol, dipropylene glycol, neopentyl glycol, and 1,3-butanediol. , 1,4-butanediol, 1,6-hexanediol, 1,9-nonanediol, 1,10-nonanediol, 2,2,4-trimethyl-1,3-pentanediol , 3-methyl-1,5-pentanediol, neopentyl glycol hydroxypivalate, cyclohexanedimethanol, 1,4-cyclohexanediol, helical diol, tricyclodecane hydroxymethyl, Hydrogenated bisphenol A, ethylene oxide addition bisphenol A, propylene oxide addition bisphenol A, trimethylolethane, tridimethylolpropane, glycerol, 3-methylpenta-1, 3,5-triol, neopentyltetraol, dipentaerythritol, tripentenol, glucose.

As the diisocyanate, for example, various diisocyanates of an aromatic, aliphatic or alicyclic group can be used. Specific examples include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2,4-tolyl diisocyanate, 4,4-diphenyl diisocyanate, 1,5-extension. Naphthyl diisocyanate, 3,3-dimethyl-4,4-diphenyl diisocyanate, xylylene diisocyanate, trimethylhexamethylene diisocyanate, 4,4-diphenylmethane diisocyanate, and These hydrides and the like.

Examples of the polyhydric alcohol (meth) acrylate include trimethylolpropane triacrylate, neopentyl alcohol di(meth) acrylate, neopentyl alcohol tri(meth) acrylate, and neopentyl alcohol. (Meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexane diol (meth) acrylate, and the like. These may be used alone or in combination.

a (meth)acrylic polymer having an alkyl group containing two or more hydroxyl groups, for example, a (meth)acrylic polymer having a 2,3-dihydroxypropyl group, having a 2-hydroxyethyl group and a 2,3-dihydroxy group A propyl (meth)acrylic polymer.

By using the (meth)acrylic photocurable resin exemplified above, the adhesion between the haze imparting layer 32 and the base film 31 can be improved, and the mechanical strength can be further improved, and the surface can be more effectively prevented. The scratched haze imparts layer 32.

As the photopolymerization initiator, various photopolymerization initiators such as acetophenone-based, benzophenone-based, benzoin-ether-based, amine-based, and phosphine oxide-based polymers can be used. Examples of compounds classified as acetophenone-based photopolymerization initiators include 2,2-dimethoxy-2-phenylacetophenone (alias: benzyldimethylketal), 2,2-di Ethoxyacetophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2-? Lolinyl-1-(4-methylthiophenyl)propan-1-one. Examples of the compound classified into a benzophenone-based photopolymerization initiator include benzophenone, 4-chlorobenzophenone, and 4,4'-dimethoxybenzophenone. Examples of the compound classified into a benzoin ether photopolymerization initiator include benzoin methyl ether and benzoin propyl ether. Examples of compounds classified as amine photopolymerization initiators include N,N,N',N'-tetramethyl-4,4'-diaminobenzophenone (alias: Michler's Ketone; Michler's Ketone ). Examples of the phosphine oxide-based photopolymerization initiator include 2,4,6-trimethylbenzimidyldiphenylphosphine oxide. Further, a xanthone compound, a thioxanthone compound or the like can also be used as the photopolymerization initiator. Examples of typical commercial products of the photopolymerization initiators include "Irgacure 907", "Irgacure 184", and "Lucirin TPO" which are sold by the German company BASF.

The curable resin composition may contain a solvent as needed. The solvent may, for example, be any organic solvent in which ethyl acetate or butyl acetate can dissolve each component constituting the curable resin composition. It can be used by mixing two or more types of organic solvents.

Further, the curable resin composition may contain a leveling agent, and for example, a fluorine-based or polyfluorene-based leveling agent may be used. Among the polyoxane-based leveling agents, there are reactive polyfluorene oxide, polydimethyl siloxane, polyether modified polydimethyl siloxane, polymethyl alkyl decane, and the like. Among the polyoxane-based leveling agents, preferred are polyfluorinated oxygen and a halogenated leveling agent. By using reactive polyfluorene, the haze imparting property to the haze imparting layer can maintain good scratch resistance for a long period of time. Further, when a siloxane-based leveling agent is used, film formability can be improved.

As described above, the haze imparting layer 32 may also contain particles that generate light scattering.

Examples of the particles include inorganic particles such as cerium oxide, colloidal cerium oxide, aluminum oxide, alumina sol, aluminum silicate, aluminum oxide-cerium oxide composite oxide, kaolin, talc, mica, calcium carbonate, calcium phosphate, etc.; Organic particles such as acrylic particles, methyl methacrylate/styrene copolymer resin particles, crosslinked polystyrene particles, crosslinked polymethyl methacrylate particles, polyoxyxylene resin particles, and polyamidene particles.

The particles preferably have an average particle diameter of 0.1 to 10 μm and a difference in refractive index from the curable resin after curing of 0.02 to 0.2. By using particles having an average particle diameter and a refractive index difference within the range, the haze can be effectively exhibited. The average particle diameter of the fine particles can be determined by a dynamic light scattering method or the like. The average particle diameter in this case is a weight average particle diameter.

The haze-providing layer 32 having surface irregularities can be applied onto the base film 31 by 1) a curable resin composition containing the curable resin and the particles, and a coating film can be formed, and the unevenness based on the particles can be provided. (2) A method in which a curable resin composition containing particles or no particles is applied onto a base film 31 to form a coating film, and then pressed against a mold (roller or the like) having a concavo-convex shape on the surface to transfer an uneven shape (also known as "embossing method").

In the method of the above 1), a curable resin composition containing a curable resin and particles is applied onto the base film 31, and the coating film is cured by light irradiation or heating by ultraviolet light or the like to form a haze. Layer 32.

On the other hand, the method (embossing method) of the above 2) is applied to a mold having a concavo-convex shape on its surface, and the shape of the mold is transferred to a coating film (resin layer) formed on the base film 31.

The coating film of the transfer uneven shape may or may not contain the above-mentioned particles. In the embossing method, a curable resin composition containing a photocurable resin is applied onto the base film 31, and the formed coating film is pressed against the uneven surface of the mold to be hardened to form a concave-convex surface of the mold. Transfer to the film. More specifically, the curable resin composition is applied onto the base film 31, and the formed coating film is adhered to the uneven surface of the mold, and light such as ultraviolet rays is irradiated from the side of the base film 31 to be coated. In the film hardening, the base film 31 having the cured coating film (haze imparting layer 32) is peeled off from the mold, and the uneven shape of the mold is transferred to the haze imparting layer 32.

The thickness of the haze imparting layer 32 is, for example, 2 to 30 μm, preferably 3 to 30 μm. When the thickness of the haze imparting layer 32 is less than 2 μm, sufficient hardness cannot be obtained, and the surface tends to be easily scratched. When the thickness of the haze-providing layer 32 exceeds 30 μm, the film is easily broken, and the intermediate layer is curled by the curing shrinkage when the haze-providing layer 32 is formed, and the productivity tends to be lowered. Further, it is suitable for the thickness in the above range in order to impart sufficient haze.

The intermediate layer 30 is preferably based on the haze of the haze imparting layer 32, but may have a haze based on the haze imparting layer 32 while being based on the haze of the base film 31. The haze based on the base film 31 can be expressed, for example, by dispersing the above particles in the film.

Further, the intermediate layer 30 is an example of a single-layer structure, and the intermediate layer 30 may be composed only of the base film 31 in which the particles are dispersed (it may be composed only of the haze-providing layer 32). The thickness of the intermediate layer 30 composed only of the base film 31 in which the above particles are dispersed is preferably 20 to 200 μm, more preferably 20 to 120 μm.

 (3) the first adhesive layer and the second adhesive layer  

Each of the first adhesive layer 40 and the second adhesive layer 50 may be an adhesive of a (meth)acrylic, rubber, amine ester, ester, polyoxyn, or polyvinyl ether resin as a main component. Composition of the composition. Among them, a (meth)acrylic resin excellent in transparency, weather resistance, heat resistance and the like is suitable as an adhesive composition of a matrix polymer. The adhesive composition may be an active energy ray hardening type or a thermosetting type.

As the (meth)acrylic resin (matrix polymer) used for the adhesive composition, for example, butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, (A) is suitably used. One or two or more kinds of polymers or copolymers of a (meth) acrylate of 2-ethylhexyl acrylate as a monomer. It is preferred to copolymerize the polar monomer in the matrix polymer system. The polar monomer may, for example, be (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, (meth)acrylamide, or N,N-di(meth)acrylate. A monomer having a carboxyl group, a hydroxyl group, a decylamino group, an amine group, an epoxy group or the like of methylaminoethyl ester or glycidyl (meth)acrylate.

The adhesive composition may comprise only the above-mentioned matrix polymer, but usually contains a crosslinking agent. The crosslinking agent is exemplified by a metal ion having a valence of 2 or more and a metal carboxylic acid salt formed between the carboxyl group and the carboxyl group; a polyamine compound and a guanamine bond formed between the carboxyl group; and a polyepoxide compound; An alcohol which forms an ester bond with a carboxyl group; is a polyisocyanate compound and forms a guanamine bond with a carboxyl group. Among them, a polyisocyanate compound is preferred.

The active energy ray-curable adhesive composition refers to a property of being cured by irradiation with an active energy ray such as ultraviolet rays or electron beams, and also has adhesiveness before being irradiated to the active energy ray, and can be attached to a film or the like. The body is bonded, and has an adhesive composition which is hardened by irradiation with an active energy ray to adjust the adhesive force. The active energy ray-curable adhesive composition is preferably an ultraviolet curing type. The active energy ray-curable adhesive composition further contains an active energy ray-polymerizable compound in addition to the matrix polymer and the crosslinking agent. Further, a photopolymerization initiator, a photosensitizer, or the like may be contained as needed.

In order to impart the above-described predetermined haze to the optical layered body 100, at least one of the first adhesive layer 40 and the second adhesive layer 50 may have a haze of not zero. The first adhesive layer 40 and/or the second adhesive layer 50 in this case have a haze of, for example, 0.1 to 5%. The first adhesive layer 40 and the second adhesive layer 50 may have the same haze value or may have mutually different haze values. For example, the haze can be imparted to the adhesive layer by including the above particles in the adhesive composition.

The first adhesive layer 40 and the second adhesive layer 50 may contain other additives. Examples of other additives include beads (resin particles, glass particles, etc.), glass fibers, resins other than matrix polymers, adhesion imparting agents, fillers (metal powders, other inorganic powders, etc.), antioxidants, and ultraviolet absorption. Agents, dyes, pigments, colorants, antifoaming agents, preservatives, photopolymerization initiators, and the like.

The thickness of the first adhesive layer 40 and the second adhesive layer 50 may be 1 to 40 μm, respectively. However, from the viewpoint of reducing the thickness of the optical laminate 100 and the display device, and maintaining good workability and suppressing dimensional change, In terms of, it is preferably 3 to 25 μm (for example, 3 to 20 μm, and further 3 to 15 μm).

The first adhesive layer 40 and the second adhesive layer 50 may have the same configuration, and may have different optical characteristics such as thickness, material, and light diffusibility.

The first adhesive layer 40 and the second adhesive layer 50 can be formed by applying an organic solvent diluent of the above-described adhesive composition onto a substrate and drying it. The substrate may be the first reflective polarizer layer 10, the second reflective polarizer layer 20, the intermediate layer 30, a separator film (release film), or the like. When the active energy ray-curable adhesive composition is used, the adhesive layer formed can be an adhesive layer having a desired degree of hardening by irradiating the active energy ray.

The separator may be a film which is subjected to release treatment on the surface on which the side of the adhesive layer is laminated. Examples of the release treatment are polyoxane treatment, long-chain alkyl treatment, fluorine treatment, and the like. The material of the film is, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, or a polyester resin such as polyethylene terephthalate.

 (4) Modification of optical laminate  

Referring to Fig. 3, the optical laminate may further include a third adhesive layer 60 laminated on the outer adhesive layer of at least one of the first reflective polarizer layer 10 and the second reflective polarizer layer 20. The third adhesive layer 60 is a user for bonding the optical laminate to another member. Other members include, for example, another optical film, any optical member included in a display device (image display device), and an optical member disposed on the outermost surface of, for example, a display device (image display device). The specific configuration of the third adhesive layer 60 is described in the above (3) regarding the first adhesive layer 40 and the second adhesive layer 50.

In the optical layered body 300 shown in FIG. 3, the third adhesive layer 60 is laminated on the outer surface of the first reflective polarizer layer 10, but is not limited thereto, and may be laminated on the second reflective polarizer layer 20. The outer surface of the first reflective polarizer layer 10 and the outer surface of the second reflective polarizer layer 20 may be laminated on the outside.

The optical layered body having a three-layer structure in which the first reflective polarizer layer 10 and the second reflective polarizer layer 20 are bonded to each other via the adhesive layer may be an optical layered body according to the present invention. At this time, the adhesive layer corresponds to the intermediate layer (haze imparting layer). In this embodiment, the adhesive layer is preferably a light-diffusing adhesive layer containing the particles in order to impart a haze to the optical laminate in the predetermined range. In this case, the haze of the optical laminate can be adjusted by adjusting the content of the particles.

An adhesive layer may also be used instead of the adhesive layer. The adhesive described in (5) below can be similarly used for the adhesive which forms an adhesive layer. In the case where the pressure-sensitive adhesive layer is used, the pressure-sensitive adhesive layer is preferably a light-diffusing adhesive layer containing the particles in order to impart a haze in the predetermined range to the optical laminate.

Referring to Fig. 4, the optical laminate may further include a base material layer 70 disposed outside the first reflective polarizer layer 10 or outside the second reflective polarizer layer 20. The base material layer 70 is a member that supports the optical laminate. In the optical layered body 400 shown in FIG. 4, the base material layer 70 is laminated on the side of the first reflective polarizer layer 10, but the present invention is not limited thereto, and may be laminated on the side of the second reflective polarizer layer 20.

The base material layer 70 is not particularly limited, and examples thereof include a glass plate and a thermoplastic resin film. The base material layer 70 is typically a member disposed on the outermost surface of the display device, for example, an absorption-type polarizing plate disposed on the identification side of the display device; the identification side of the absorption-type polarizing plate disposed on the identification side, and the most disposed on the display device a front panel of the surface; a touch panel component disposed on the outermost surface of the touch input display device.

The absorptive polarizing plate may be a polarizer including at least a dichroic dye which adsorbs iodine, a dichroic organic dye or the like in the stretched polyvinyl alcohol resin film. The absorptive polarizing plate may be a protective film composed of a thermoplastic resin or the like on one side or both sides of the polarizer. The thickness of the polarizer is, for example, 2 to 30 μm, preferably 2 to 10 μm. The thickness of the protective film is, for example, 2 to 150 μm, preferably 5 to 100 μm. The protective film may be a retardation film.

 (5) Method of manufacturing optical laminate  

In the optical layered body 100 shown in Fig. 1, the first reflective polarizer layer 10 can be laminated via the first adhesive layer 40 on one surface of the intermediate layer 30, and the second adhesive layer can be interposed between the other surface of the intermediate layer 30. The second reflective polarizer layer 20 is laminated on the agent layer 50 to be produced. Before the lamination of the layers, the bonding surface of the first reflective polarizer layer 10 from the first adhesive layer 40, the bonding surface of the intermediate layer 30 to the first adhesive layer 40, and the middle are selected. At least one bonding surface of the layer 30 and the bonding surface of the second adhesive layer 50 and the bonding surface of the second reflective polarizer layer 20 and the second adhesive layer 50 are preferably at least one bonding surface. A surface activation treatment can be performed for two or more bonding surfaces, and more preferably all bonding surfaces. In addition to or in place of the bonding surfaces, the bonding surface selected from the first adhesive layer 40 and the first reflective polarizer layer 10 and the first adhesive layer 40 are selected. The bonding surface of the intermediate layer 30, the bonding surface of the second adhesive layer 50 and the bonding surface of the second reflective polarizer layer 20, and the bonding surface of the second adhesive layer 50 with the intermediate layer 30 At least one bonding surface is preferably two or more bonding surfaces, more preferably all bonding surfaces, and a surface activation treatment can be performed. It is advantageous to carry out the surface activation treatment in an optical layered body which is less likely to cause layer peeling and which is excellent in wet heat durability.

Examples of the surface activation treatment include dry treatment such as corona treatment, plasma treatment, discharge treatment (glow discharge treatment, etc.), flame treatment, ozone treatment, UV ozone treatment, ionization active line treatment (ultraviolet treatment, electron beam treatment, etc.). Treatment; ultrasonic treatment using ultrasonic treatment of water, acetone or the like, alkali treatment, and anchor treatment. These treatments may be carried out singly or in combination of two or more. Among them, the film which is wound up from the film roll is continuously treated, preferably corona treatment or plasma treatment.

The bonding of the first reflective polarizer layer 10 and the second reflective polarizer layer 20 to the intermediate layer 30 can be carried out using an adhesive. In this case, it is disposed between the first reflective polarizer layer 10 and the intermediate layer 30 and between the second reflective polarizer layer 20 and the intermediate layer 30 as an adhesive. The first reflective polarizer layer 10 and the second reflective polarizer layer 20 are bonded to the intermediate layer 30, and one is placed between the adhesive layer and the other via the adhesive layer.

The adhesive forming the adhesive layer may be an active energy ray-curable adhesive containing a curable compound which is cured by irradiation with an active energy ray such as ultraviolet rays, visible light, electron beams or X-rays (preferably ultraviolet curability) The adhesive agent is a water-based adhesive in which an adhesive component of a polyvinyl alcohol-based resin is dissolved or dispersed in water.

The curable compound may be a cationically polymerizable curable compound or a radically polymerizable curable compound. The cationically polymerizable curable compound may, for example, be an epoxy compound (a compound having one or two or more epoxy groups in the molecule) or an oxetane compound (having 1 in the molecule). One or two or more compounds of the oxetane ring) or a combination of these. The radically polymerizable curable compound may, for example, be a (meth)acrylic compound (a compound having one or two or more (meth)acryloxy groups in the molecule) and having a radical polymerizable double bond. Other vinyl compounds or combinations of these. A cationically polymerizable curable compound and a radically polymerizable curable compound may also be used in combination. The active energy ray-curable adhesive usually further contains a cationic polymerization initiator and/or a radical polymerization initiator for initiating a curing reaction of the above-mentioned curable compound.

The optical layered body according to the modification described in the above (4) can be produced in the same manner as the method described above.

 (6) Characteristics of optical laminates, etc.  

According to the optical layered body of the present invention, even when it is disposed on the identification side of the display device, the occurrence of rainbow lines can be effectively suppressed, and good visibility can be obtained. As described above, the visibility includes changing the power of the display device to the white display (display mode), using the display device as the visibility of the image when displaying the image on the screen, and making the power supply OFF and the screen is black (mirror mode), and the visibility is used when the display device is used as a mirror.

In the above-described white display (display mode), the so-called visibility refers to the sharpness of an image (penetrating image) mainly reflected by the screen. In the above black display (mirror mode), the so-called identification refers to the sharpness of the reflected image of the picture and its hue.

In order to improve the visibility of the black display (mirror mode), it is preferable that the surface of the optical laminate (the surface facing the outside when applied to the display device) has good reflection characteristics. This reflection characteristic can be evaluated as a reflection luminance ratio. The reflection luminance ratio refers to the apparent reflectance R _SCI measured by the way of specular reflection light incidence. According to the optical layered body of the present invention, it is possible to achieve both high visibility in a white display (display mode) and high reflectance luminance (and therefore high visibility in black display (mirror mode)).

The method of measuring the apparent reflectance R _SCI measured by the way of specular reflection light incidence will be described with reference to FIG. Fig. 5 is a schematic _cross- sectional view showing an optical system for measuring a visual reflectance R _SCI . The optical system shown in Fig. 5 is an optical system of a diffusion illumination method. The diffusion illumination method is a method in which the measurement sample is uniformly illuminated from all directions using an integrating sphere or the like, and in FIG. 5, an integrating sphere 80 is provided (a white paint such as barium sulfate which almost completely diffuses and reflects light is applied to the inner surface) Made of balls). The light emitted from the light source 81 is diffused inside the integrating sphere 81 and reflected on the surface of the measurement sample 82. Since the optical system shown in FIG. 5 is configured such that light in all directions including the light in the normal reflection direction of the light receiving portion is incident on the surface of the measurement sample, it is called a specular reflection light incident mode (SCI mode).

On the other hand, in the position where the light-receiving portion is in the direction of the integrating sphere 80 in the normal reflection direction, a light-acquisition device is provided (light entering is absorbed, and is not returned to the integrating sphere 80), and the like is configured to receive light. The portion is a specular reflection light removal mode (SCE mode) in which the light in the direction of the normal reflection does not strike the optical system on the surface of the measurement sample.

The reflection spectrum of the measurement sample is obtained by using the optical system shown in Fig. 5, and the reflectance of the reflection spectrum is calculated according to the method specified in JIS Z8722:2009 "Method for measuring color - color of reflection electrode penetrating object". The visual reflectance R _SCI measured by the way of specular reflected light incidence.

The reflection luminance ratio of the optical laminate is preferably 55% or more, and may be 60% or more. Further, the reflection luminance ratio is preferably 85% or less, and may be 80% or less. The reflectance luminance ratio having the above range is advantageous in that both the white display (display mode) and the black display (mirror display) are recognized.

 <display device>  

The above optical laminate can be applied to a display device. Preferably, the display device (image display device) includes a display element (image display element) and the optical layered body disposed on the identification side thereof. According to the optical layered body of the present invention, even when it is disposed on the identification side of the display device, the occurrence of rainbow lines can be effectively suppressed, and good visibility can be obtained.

The display element is not particularly limited, and examples thereof include a liquid crystal cell (also referred to as a "liquid crystal cell" in a liquid crystal display device), an organic EL device in an organic EL device, and a touch panel device in a touch input display device. Wait. The mounting of the optical laminate to the display device can be performed via an adhesive layer (for example, the third adhesive layer 60 described above).

The display device includes an absorptive polarizing plate on the side of the display element, and the optical layered body is disposed on the side of the first reflective polarizer layer 10 and the second reflective polarizer layer 20 of the optical layered body. The angle formed by the reflection axis of the reflection-type polarizer layer disposed closer to the absorption-type polarizing plate and the absorption axis of the absorption-type polarizing plate is preferably about 0°. By "about" is meant a deviation within a range of ±10°, preferably ±5°.

 [Examples]  

Hereinafter, the present invention will be more specifically described by showing examples and comparative examples, but the present invention is not limited to the examples.

 <Example 1>    (1) Modulation of ultraviolet curable resin composition  

The ultraviolet curable resin composition 1 is prepared, and the ultraviolet curable resin composition 1 contains pentaerythritol triacrylate and a polyfunctional amine esterified acrylate (hexamethylene diisocyanate and pentaerythritol triacrylate). The reaction product) had a weight ratio of 60/40 in the former/the latter, and was dissolved in ethyl acetate so that the total concentration of the two was 60% by weight, and the leveling agent was further prepared. The pentaerythritol triacrylate and the polyfunctional amine esterified acrylate which are contained in the ultraviolet curable resin composition 1 are collectively referred to as "curable component". 1 part by weight of methyl methacrylate/styrene copolymer resin particles having an average particle diameter of 2.7 μm was added to 100 parts by weight of the curable component of the ultraviolet curable resin composition 1 to be dispersed, and further, a curable component was added. The ethyl acetate was diluted with 30% by weight of the total concentration of the resin particles to obtain an ultraviolet curable resin composition 2. In the ultraviolet curable resin composition 2, 1 part by weight of a photopolymerization initiator (trade name "IRGACURE (registered trademark) 184", manufactured by CHIBA Co., Ltd.) was added to 100 parts by weight of the curable acrylate to obtain an ultraviolet curable resin composition. Item 3.

In the ultraviolet curable resin composition 1, 1 part by weight of the photopolymerization initiator was added to 100 parts by weight of the curable component, and the refractive index of the cured product which was cured by irradiation with ultraviolet rays was 1.53. The above methyl methacrylate/styrene copolymer resin particles had a refractive index of 1.49. Therefore, the refractive index difference between the two is 0.04.

 (2) Production of a film having a laminated structure of a base film and a cured layer  

The ultraviolet curable resin composition 3 prepared in the above (1) is applied onto the surface of a triacetyl cellulose (TAC) film (trade name "TD60" manufactured by Fuji Film Co., Ltd., thickness: 60 μm) as a base film. The film thickness after drying was set to 5 μm, and the film was dried in a dryer set at 60 ° C for 3 minutes. After the drying, the ultraviolet light from a high-pressure mercury lamp having a strength of 20 mW/cm ^{2 was} irradiated from the coating film side of the film to a temperature of 200 mJ/cm ² in the h-line, and the coating film of the ultraviolet curable resin composition 3 was cured to obtain A film having a laminated structure of a base film and a cured layer (haze imparting layer).

The optically transparent (meth)acrylic adhesive layer is bonded to the base film surface of the film having the laminated structure of the base film and the cured layer, and the optical laminate is bonded to the alkali-free layer via the adhesive layer. A glass substrate (trade name "EagleXG" manufactured by Corning Incorporated) was used as a measurement sample. For the measurement sample, light was incident from the glass substrate side, and the haze meter "HM-150" manufactured by Murakami Color Technology Research Institute was used according to JIS K 7136:200 "Method for Obtaining Haze of Plastic-Transparent Material". The haze was measured and found to be 1.0%.

 (3) Production of optical laminates  

A sheet-shaped body having a size of 20 cm × 30 cm was cut out from a reflective polarizer (trade name "APF-v3" manufactured by 3M Co., Ltd., thickness: 26 μm) to obtain a first reflective polarizer layer. In the first reflective polarizer layer, the angle between the short side and the reflection axis is 0°. A sheet-like body having a size of 20 cm × 30 cm was cut out from the above-mentioned reflective polarizer, and this was used as the second reflection type polarizer layer. In the second reflective polarizer layer, the short side and the reflection axis form an angle of 50°. From the film having the laminated structure of the base film and the cured product layer obtained in the above (2), a sheet having a size of 20 cm × 30 cm was cut out to obtain an intermediate layer.

The intermediate layer was laminated on the first reflective polarizer layer with a (meth)acrylic adhesive layer (20 cm × 30 cm) having a thickness of 20 μm. At this time, the intermediate layer is laminated so that the base film of the intermediate layer contacts the (meth)acrylic adhesive layer. Prior to lamination, the bonding surface of the first reflective polarizer layer with the adhesive layer and the bonding surface with the adhesive layer in the intermediate layer were subjected to corona treatment. Then, a second reflective polarizer layer was laminated on a (meth)acrylic adhesive layer (20 cm × 30 cm) having a thickness of 20 μm on the intermediate layer to obtain an optical laminate having a size of 20 cm × 30 cm. Prior to lamination, the bonding surface of the second reflective polarizer layer to the adhesive layer and the bonding surface of the intermediate layer to the adhesive layer are subjected to corona treatment. The angle formed by the reflection axis of the first reflection-type polarizer layer and the reflection axis of the second reflection-type polarizer layer (the relative angle of the reflection axis) was 50°.

 (4) Determination of the reflectance luminance ratio of the optical laminate  

An optically transparent (meth)acrylic adhesive layer is bonded to the outer surface of the first reflective polarizer layer of the optical laminate, and the optical laminate is bonded to the black acrylic plate via the adhesive layer. The sample was measured. For the measurement sample, a spectroscopic colorimeter ("CM-2600d" manufactured by Konica Minolta Co., Ltd.) was used to measure the reflectance in the SCI mode at a temperature of 23 ° C in the form of specular reflection light incident. The rate of R _SCI is obtained as a reflection luminance ratio. The results are shown in Table 1.

 (5) Determination of haze of optical laminates  

The (meth)acrylic adhesive layer is bonded to the outer surface of the first reflective polarizer layer of the optical laminate, and the optical laminate is bonded to the alkali-free glass substrate via the adhesive layer (trade name of Corning Corporation) "EagleXG") as a measurement sample. For the measurement sample, light was incident from the glass substrate side, and the haze meter "HM-150" manufactured by Murakami Color Technology Research Institute was used according to JIS K 7136:200 "Method for Obtaining Haze of Plastic-Transparent Material". Type, measure the haze. The results are shown in Table 1.

 (6) Evaluation of Rainbow Pattern of Optical Laminates  

The transparent (meth)acrylic adhesive layer was bonded to the outer surface of the first reflective polarizer layer of the optical laminate, and the optical laminate was bonded to the black acrylic plate via the adhesive layer. sample. The surface of the second reflective polarizer layer of the measurement sample was incident from the light of the three-wavelength fluorescent lamp with an incident angle of 60° and 90° with respect to the surface, and visually observed whether or not the three wavelengths reflected on the surface were observed. The image of the fluorescent lamp produces a rainbow pattern. The results are shown in Table 1. At any incident angle, the case where the rainbow pattern is completely invisible is "AA". At any incident angle, the case where the rainbow pattern is almost invisible is "A". At least one incident angle, the rainbow pattern can be seen. The situation is "B".

 (7) Identification evaluation  

An optically transparent (meth)acrylic adhesive layer is bonded to the outer surface of the first reflective polarizer layer of the optical laminate, and the optical laminate is bonded to the IPS mode liquid crystal display device via the adhesive layer ( The product name "22MP57VQ-P" made by LG Electronics Co., Ltd.). At this time, the reflection axis of the first reflection-type polarizer layer is bonded to the absorption axis of the identification-side polarizing plate of the liquid crystal display device in parallel. The power of the liquid crystal display device is turned ON, and the screen is displayed in white (display mode). The characters are input and mapped on the screen, and the visibility of the characters (the visibility of the transmitted image) is visually evaluated. The results are shown in the column of "Identification Evaluation" and "Penetization Image" in Table 1. The case where the text can be clearly recognized is "AA", the case where the character can be clearly recognized is "A", and the case where the text is unclear is "B".

Further, the power of the liquid crystal display device was turned off, and the screen was displayed in black, and the visibility of the reflected image in the mirror mode was visually evaluated. The results are shown in the column of "Identification Evaluation" and "Reflection Image" in Table 1. The case where the reflection image and its color are very clear is "AA", the case where the reflection image and its color are clear is "A", and the case where the reflection image and its color are not clear is "B".

 <Examples 2 to 9, Comparative Examples 1 to 4>  

An optical laminate was produced in the same manner as in Example 1 except that the configuration of the intermediate layer, the haze of the intermediate layer, and the relative angle of the reflection axis were as shown in Table 1, and Example 1 was carried out in the same manner as in Example 1. 4) to (7) measurement and evaluation. The results are shown in Table 1. The results of the measurement of the haze of the intermediate layer are shown in Table 1. The haze of the intermediate layer is adjusted by changing the amount of the methyl methacrylate/styrene copolymer resin particles added to the ultraviolet curable resin composition 1. The thickness of the cured layer was the same as in Example 1. In Comparative Examples 1 to 3, methyl methacrylate/styrene copolymer resin particles were not contained in the cured layer of the intermediate layer.

In the table 1, the "AC film" means a (meth)acrylic resin film having a thickness of 100 μm. The "COP film" refers to a cyclic polyolefin resin film having a thickness of 100 μm.

 <Comparative Examples 5 to 9>  

Except that an optically transparent (meth)acrylic adhesive layer (referred to as "transparent adhesive layer" in Table 1) having a thickness of 20 μm was used as the intermediate layer, and the relative angles of the reflection axes were as shown in Table 1, In the same manner as in Example 1, the measurement and evaluation of (4) to (7) of Example 1 were carried out in the same manner as in Example 1. The results are shown in Table 1.

 <Comparative Examples 10 and 11>  

An optical laminate was produced in the same manner as in Example 1 except that a light-diffusing adhesive layer having a thickness of 20 μm was used as the intermediate layer, and the measurement of (4) to (7) of Example 1 was carried out in the same manner as in Example 1. Evaluation. The results are shown in Table 1. The light-diffusing adhesive layer is formed by dispersing light-diffusing particles in an optically transparent (meth)acrylic adhesive layer. The haze of the light diffusing adhesive layer is adjusted by changing the amount of the light diffusing particles added.

Claims (9)

 An optical laminate comprising a first reflective polarizer layer, a second reflective polarizer layer, and an intermediate layer disposed between the first reflective polarizer layer and the second reflective polarizer layer; The angle between the reflection axis of the reflective polarizer layer and the reflection axis of the second reflection type polarizer layer is 20° or more and 70° or less, and the haze is 0.4% or more and 20% or less.    The optical laminate according to claim 1, wherein the reflection luminance is 55% or more and 85% or less.    The optical layered body according to claim 1 or 2, wherein the intermediate layer has a haze of 0.8% or more and 20% or less.    The optical layered body according to any one of claims 1 to 3, wherein the intermediate layer comprises two or more layers.    The optical laminate according to claim 4, wherein the two or more layers have different hazes from each other.    The optical layered body according to any one of the first to fifth aspect, further comprising a substrate disposed outside the first reflective polarizer layer or outside the second reflective polarizer layer Floor.    The optical laminate according to claim 6, wherein the substrate layer comprises an absorbing polarizer layer.    The optical layered body according to any one of the first to seventh aspect, further comprising an outer layer of at least one of the first reflective polarizer layer and the second reflective polarizer layer Adhesive layer.    The optical layered body according to any one of claims 1 to 8, which is disposed on the identification side of the display element.