Laminate

Abstract

To provide a laminate which comprises a cured resin layer, a film-like linearly polarizing plate, an adhesive layer, and a film-like retardation layer arranged in the described order, and which significantly reduces cracking of the cured resin layer and a cured liquid crystal layer when end faces of a plurality of the laminates are polished together while being stacked on top of each other.SOLUTION: A laminate is provided, comprising a cured resin layer, a film-like linearly polarizing plate, an adhesive layer, and a film-like retardation layer including a cured liquid crystal layer, arranged in the described order. The cured resin layer satisfies a condition expressed as HM≥2.4×102 (N / mm2), where HM (N / mm2) represents a Martens hardness of the cured resin layer at 23°C. The adhesive layer satisfies a condition expressed as E / T≥2.5×103 (Pa / μm), where E (Pa) represents a storage modulus of the adhesive layer at 25°C and T (μm) represents a thickness thereof.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to a laminate. [Background technology]

[0002] Conventionally, a laminate comprising a linear polarizing plate, a hard coat layer laminated on one side thereof, and a liquid crystal layer laminated on the other side via an adhesive layer is known (Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-106602 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] In the above-mentioned laminate, when multiple laminates were stacked on top of each other and their edges were polished, cracks sometimes occurred in the hard coat layer and / or the liquid crystal layer.

[0005] The present invention aims to provide a laminate comprising a cured resin layer, a film-like linear polarizing plate, an adhesive layer, and a film-like phase difference layer in this order, which can minimize cracks that occur in the cured resin layer and the liquid crystal cured layer when multiple laminates are stacked on top of each other and their edges are polished. [Means for solving the problem]

[0006] The present invention provides the following laminate and image display device. [1] comprising a cured resin layer, a film-like linear polarizing plate, an adhesive layer, and a film-like phase difference layer in this order, The aforementioned film-like phase difference layer includes a liquid crystal curing layer, The Martens hardness of the aforementioned cured resin layer at a temperature of 23°C is HM (N / mm²). 2 When ) then, the following equation (1): HM ≥ 2.4×10 2 (N / mm 2 ) (1) satisfies When the storage elastic modulus at a temperature of 25°C of the adhesive layer is E (Pa) and the thickness is T (μm), the following formula (2): E / T ≥ 2.5×10 3 (Pa / μm) (2) A laminate that satisfies the above. [2] The film-shaped linear polarizer is the laminate according to [1], which includes a thermoplastic resin film. [3] The storage elastic modulus E (Pa) at a temperature of 25°C is 3.0×10 4 or more, the laminate according to [1] or [2]. [4] The thickness T (μm) is 30 m or less, the laminate according to any one of [1] to [3]. [5] The film-shaped retardation layer includes two or more liquid crystal cured layers, the laminate according to any one of [1] to [4]. [6] The laminate is in a sheet form, the laminate according to any one of [1] to [5]. [7] The laminate has a polished end face, the laminate according to any one of [1] to [6]. [8] A laminate for a flexible image display device, comprising the laminate according to any one of [1] to [7], a front panel, and a touch sensor. [9] An image display device having the laminate according to any one of [1] to [7].

[10] A flexible image display device having the laminate for a flexible image display device according to [8]. [Effect of the Invention]

[0007] According to the present invention, there is provided a laminate including a cured resin layer, a film-shaped linear polarizer, an adhesive layer, and a film-shaped retardation layer in this order, and the laminate can reduce cracks generated in the cured resin layer and the liquid crystal cured layer when the end faces are polished in a state where a plurality of laminates are overlapped with each other. [Brief Description of the Drawings]

[0008] [Figure 1] This is a schematic cross-sectional view showing an example of the layer structure of a laminated linear polarizing plate. [Figure 2] This is a schematic cross-sectional view showing another example of the layer configuration of a laminated linear polarizing plate. [Figure 3] This is a schematic cross-sectional view showing yet another example of the layer configuration of a laminated linear polarizing plate. [Figure 4] This is a schematic perspective view illustrating an example of a method for manufacturing the laminate of the present invention. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to the following embodiments. In all the following drawings, the scale has been adjusted as appropriate to make each component easier to understand, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.

[0010] <Laminate> Figure 1 is a schematic cross-sectional view showing an example of the layer structure of a laminate. The laminate 1 shown in Figure 1 comprises, in this order, a cured resin layer 100, a film-like linear polarizing plate 110, an adhesive layer 120, and a film-like phase difference layer 130. The film-like phase difference layer 130 includes a liquid crystal curing layer (not shown). The laminate 1 may further include other layers besides those described above. Examples of other layers include a protective film that can be bonded to the cured resin layer 100, and a bonding layer that can be bonded to the film-like phase difference layer 130.

[0011] Preferably, the laminate 1 is constructed by directly laminating a cured resin layer 100 and a film-like linear polarizing plate 110, a film-like linear polarizing plate 110 and an adhesive layer 120, and an adhesive layer 120 and a film-like phase difference layer 130.

[0012] The laminate 1 may be elongated or sheet-shaped. The laminate 1 is preferably sheet-shaped. A sheet-shaped laminate can be obtained by cutting from an elongated laminate. When the laminate 1 is sheet-shaped, the plan view shape of the laminate 1 may be, for example, a square shape, preferably a square shape having a long side and a short side, and more preferably a rectangle. When the plan view shape of the laminate 1 is a rectangle, the length of the long side may be, for example, 10 mm or more and 1400 mm or less, and preferably 30 mm or more and 600 mm or less. The length of the short side may be, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 30 mm or more and 300 mm or less. In this specification, "plan view" means viewing from the direction of the layer's thickness.

[0013] When the laminate 1 is in the form of a single sheet, the laminate 1 preferably has polished end faces for the purpose of removing burrs and other debris generated on the end faces of the laminate during cutting, and from the viewpoint of dimensional accuracy. In a plan view of the laminate 1, part or all of the end faces may be polished, and preferably all of the end faces are polished. Furthermore, if the plan view shape of the laminate 1 is rectangular, the lengths of each side in each layer constituting the laminate 1 may be the same. When the lengths of each side are the same, the plan view shape of the laminate 1 is square. If the laminate 1 has a rectangular shape in plan view, each layer constituting the laminate 1 may have a notched portion at any of its corners, or for example, all of its corners may be notched. If there is a notch at a corner, this corner may be rounded and notched in a curved shape, or it may be notched in a straight line. If the laminate 1 has a rectangular shape in plan view, one of the sides constituting the laminate 1 may be notched in a concave shape. The laminate 1 may have through holes in its interior surface in plan view.

[0014] The laminate 1 may be, for example, a laminate having antireflection performance. Examples of the laminate having antireflection performance include a circular polarizing plate. In an image display device, by providing a laminate having antireflection performance on the front side of the image display device, it is possible to suppress a decrease in visibility due to reflection of external light.

[0015] The laminate 1 can be used in an image display device. The image display device may be any type such as a liquid crystal display device, an organic EL display device, etc. The laminate 1 can be arranged on the front side (viewing side) of the image display device or on the back side. When the laminate 1 is arranged on the front side of the image display device, it can be arranged such that the cured resin layer 100 side becomes the outermost surface.

[0016] When the image display device is a liquid crystal display device, the laminate 1 can be arranged as a laminate including a polarizing plate arranged on the front side of the liquid crystal cell. When the image display device is an organic EL display device, the laminate 1 can be arranged on the front side as a circular polarizing plate arranged on the front side for the purpose of preventing reflection of external light.

[0017] [Formula (1)] When the Martens hardness at a temperature of 23 ° C of the cured resin layer 100 of the laminate 1 (hereinafter, simply referred to as Martens hardness for the sake of simplification) is HM (N / mm 2 ), the following formula (1): HM ≧ 2.4×10 2 (N / mm 2 ) (1) is satisfied. When the cured resin layer 100 of the laminate 1 has a Martens hardness within the above range, cracks generated in the cured resin layer 100 during polishing of the laminate 1 tend to be minor. The Martens hardness is represented by the following formula: [Number] [In the formula, HM is the Martens hardness of the cured resin layer (N / mm 2 ), F is the load (N), and As (h) is the surface area of the indenter at a depth (h) (mm 2 )] It can be calculated according to the above formula. From the above formula, it can be seen that as the Martens hardness of the cured resin layer increases, the amount of deformation of the cured resin layer in response to a constant load of indentation decreases. From this, it can be inferred that even if a constant stress is applied when polishing the end face of the laminate and strain occurs in the film-like linear polarizing plate, if the Martens hardness of the cured resin layer is high, the amount of deformation of the cured resin layer will be small, and therefore cracks in the cured resin layer will be minor. Martens hardness can be measured according to the method described in the Examples section below. In this specification, a crack refers to a fissure observed in the edge regions of the cured resin layer and the liquid crystal cured layer in the area where the laminate functions normally, when the laminate is observed in a plan view using transmitted light from an optical microscope. Cracks can be observed according to the method described in the Examples section below.

[0018] In the above formula (1), the right-hand side is preferably 2.45 × 10, from the viewpoint of making it easier to minimize cracks that occur in the cured resin layer 100. 2 (N / mm 2 ), more preferably 2.5 × 10 2 (N / mm 2 The Martens hardness of the cured resin layer 100 is typically 5.0 × 10⁻⁶. 2 (N / mm 2 ) or less, preferably 4.0 × 10 2 (N / mm 2 ) or less, for example 3.0 × 10 2 (N / mm 2 ) or less is acceptable.

[0019] Means for satisfying the above formula (1) include, for example, adjusting the composition of the curing resin layer-forming composition used to form the curing resin layer described later, adjusting the thickness of the curing resin layer, and selecting and using a commercially available product that satisfies the above formula (1). Methods for adjusting the composition of the curing resin layer-forming composition include, for example, adjusting the type and / or content of polymerizable monomers and additives that constitute the curable resin.

[0020] [Formula (2)] When the storage modulus of the adhesive layer 120 at 25°C is E (Pa) and the thickness of the adhesive layer 120 is T (μm), the following equation (2) applies: E / T ≥ 2.5 × 10 3 (Pa / μm) (2) The following conditions are met. Because the adhesive layer 120 of the laminate 1 satisfies formula (2), cracks that occur in the liquid crystal hardened layer contained in the film-like phase difference layer 130 during polishing of the laminate 1 tend to be minor. The storage modulus and thickness of the adhesive layer 120 at 25°C can be measured according to the method described in the Examples section below.

[0021] The inventors have discovered that the more elastic the adhesive constituting the adhesive layer joining the film-like linear polarizing plate and the film-like phase difference layer, the less cracks can be generated in the liquid crystal hardened layer contained in the film-like phase difference layer during polishing of the laminate. This is presumed to be because, as the more elastic the adhesive constituting the adhesive layer, the more elastic the laminate tends to be, resulting in less strain in the laminate in response to stress during polishing, and consequently, even if strain occurs in the film-like phase difference layer, the amount of deformation will be small. Furthermore, it has also been discovered that the smaller the thickness of the adhesive layer, the less cracks can be generated in the liquid crystal hardened layer contained in the film-like phase difference layer during polishing of the laminate. This is presumed to be because, as the laminate is more elastic than the adhesive layer, reducing the thickness of the adhesive layer brings the physical properties of the laminate closer to the high-elasticity properties of the laminate itself, resulting in less strain in the laminate in response to stress during polishing, and consequently, even if strain occurs in the film-like phase difference layer, the amount of deformation will be small. Furthermore, it was found that when laminate 1 satisfies both equation (2) and equation (1), the cracks occurring in the liquid crystal hardened layer can be made less severe compared to when it satisfies equation (2) but not equation (1).

[0022] In the above equation (2), the right-hand side is preferably 4.0 × 10 from the viewpoint of making it easier to minimize cracks that occur in the liquid crystal hardened layer. 3(Pa / μm). In the above equation (2), E / T is usually 1.0 × 10⁻⁶. 7 (Pa / μm) or less, for example, 5.0 × 10 5 It may be less than or equal to (Pa / μm). The preferred range for the storage modulus E and thickness T of the adhesive layer 120 at 25°C will be described later.

[0023] [Cured resin layer] The cured resin layer 100 may be a layer containing a cured product of a curable resin. Examples of curable resins include thermosetting resins and active energy ray curable resins. The cured resin layer 100 may be a layer having functions such as a hard coat layer, an anti-glare layer, an anti-reflective layer, a light-diffusing layer, an antistatic layer, an anti-fouling layer, or a conductive layer.

[0024] A cured product of a curable resin can be formed from a composition for forming a curable resin layer containing a curable resin. The composition for forming a curable resin layer may be, for example, a thermosetting composition, a cationic curable composition, a radical curable composition, etc. The composition for forming a curable resin layer may contain, for example, polymerizable monomers, polymerization initiators, additives, solvents, etc. Examples of additives include plasticizers, ultraviolet absorbers, infrared absorbers, colorants such as pigments and dyes, fluorescent whitening agents, dispersants, heat stabilizers, light stabilizers, antistatic agents, antioxidants, lubricants, surfactants, etc.

[0025] The cured resin layer 100 may be positioned on the opposite side of the film-like phase difference layer 130 of the film-like linear polarizer 110, preferably directly on the polarizer protection layer or linear polarizing layer on the opposite side of the film-like phase difference layer 130 of the film-like linear polarizer 110, and more preferably positioned on the polarizer protection layer or linear polarizing layer on the opposite side of the film-like phase difference layer 130 of the film-like linear polarizer 110 so as the outermost layer of the laminate 1. The polarizer protection layer or linear polarizing layer will be described later. When the cured resin layer 100 is positioned directly on the polarizer protection layer, for example, a thermoplastic resin film with the cured resin layer 100 can be produced by applying a composition for forming a cured resin layer onto a thermoplastic resin film that forms the polarizer protection layer and curing it to form a cured product of the composition for forming a cured resin layer, and then bonding it to the linear polarizing layer via an adhesive layer. Alternatively, a commercially available thermoplastic resin with a cured resin layer can be used. Furthermore, when the cured resin layer 100 is directly placed on the linearly polarized layer, for example, a film-like linearly polarized plate 110 equipped with the cured resin layer 100 can be manufactured by applying a composition for forming a cured resin layer onto the linearly polarized layer and curing it to form a cured product of the composition for forming a cured resin layer.

[0026] The thickness of the cured resin layer 100 may be, for example, 0.1 μm or more and 10 μm or less, and preferably 1 μm or more and 5 μm or less.

[0027] When the cured resin layer 100 is a hard coat layer, the hardness and scratch resistance of the linear polarizing layer or polarizer protective layer can be easily improved. The hard coat layer can be formed from a cured product of a hard coat layer forming composition containing an active energy ray curable resin. Examples of active energy ray curable resins include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, epoxy resins, etc. The hard coat layer may contain additives to improve its strength. The additives are not limited to inorganic fine particles, organic fine particles, or mixtures thereof.

[0028] [Film-type linear polarizing plate] The film-type linear polarizer 110 has a linear polarizing layer and a polarizer protection layer provided on at least one side of the linear polarizing layer. The linear polarizing layer can be a polarizer having the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis (parallel to the transmission axis). The polarizer protection layer is a layer for protecting the linear polarizing layer, especially the surface of the linear polarizing layer, and can be disposed on one or both sides of the linear polarizing layer, either via an adhesive layer only or directly. The film-type linear polarizer 110 may further have a substrate and an alignment film as described later. The film-type linear polarizer 110 may be flexible. The film-type linear polarizer 110 may further include a protective film as described later.

[0029] The thickness of the film-like linear polarizing plate 110 may be, for example, 5 μm or more and 100 μm or less, and preferably 10 μm or more and 80 μm or less.

[0030] [Linear polarized layer] Examples of linearly polarized layers include stretched films or stretched layers on which dichroic dyes are adsorbed, or films coated with and cured with dichroic dyes. Specifically, iodine and dichroic organic dyes are used as dichroic dyes. Dichroic organic dyes include dichroic direct dyes made of disazo compounds such as CIDIRECT RED 39, and dichroic direct dyes made of compounds such as trisazo and tetrakissazo.

[0031] [A linearly polarized film or stretched layer on which a dichroic dye has been adsorbed] This section describes a linearly polarized film (hereinafter sometimes abbreviated as "stretched film") on which a dichroic dye is adsorbed. A stretched film on which a dichroic dye is adsorbed can usually be manufactured by a process of uniaxial stretching of a polyvinyl alcohol-based resin film, a process of dyeing the polyvinyl alcohol-based resin film with a dichroic dye to adsorb the dichroic dye, a process of treating the polyvinyl alcohol-based resin film on which the dichroic dye is adsorbed with an aqueous boric acid solution, and a process of washing with water after treatment with the aqueous boric acid solution. The thickness of the linearly polarized film, which is a stretched film on which a dichroic dye is adsorbed, may be, for example, 2 μm or more and 40 μm or less.

[0032] Polyvinyl alcohol-based resins are obtained by saponifying polyvinyl acetate-based resins. Polyvinyl acetate-based resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, as well as copolymers of vinyl acetate with other monomers copolymerizable thereto. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamides having ammonium groups.

[0033] The degree of saponification of the polyvinyl alcohol-based resin is usually 85 mol% to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified; for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 to 10000, preferably 1500 to 5000.

[0034] A film made from such a polyvinyl alcohol-based resin is used as the base film for stretched films. The method for producing the polyvinyl alcohol-based resin film is not particularly limited and can be done by known methods. The film thickness of the polyvinyl alcohol-based base film may be, for example, 10 μm or more and 150 μm or less.

[0035] Uniaxial stretching of polyvinyl alcohol-based resin films can be performed before, simultaneously with, or after dyeing with dichroic dyes. When uniaxial stretching is performed after dyeing, it may be performed before or during boric acid treatment. It is also possible to perform uniaxial stretching at multiple stages. Uniaxial stretching may be performed uniaxially between rolls with different peripheral speeds, or using a heated roll. Uniaxial stretching may be performed using dry stretching in the atmosphere, or wet stretching in which the polyvinyl alcohol-based resin film is swollen with a solvent before stretching. The stretching ratio is usually between 3 and 8 times.

[0036] Dyeing of polyvinyl alcohol-based resin films with dichroic dyes is carried out, for example, by immersing the polyvinyl alcohol-based resin film in an aqueous solution containing a dichroic dye. Specifically, iodine and dichroic organic dyes are used as dichroic dyes. Dichroic organic dyes include dichroic direct dyes made from disazo compounds such as CIDIRECT RED 39, and dichroic direct dyes made from compounds such as trisazo and tetrakissazo. It is preferable to immerse the polyvinyl alcohol-based resin film in water before the dyeing treatment.

[0037] When iodine is used as a dichroic dye, a method of dyeing is usually employed in which a polyvinyl alcohol-based resin film is immersed in an aqueous solution containing iodine and potassium iodide. The iodine content in this aqueous solution is usually between 0.01 parts by mass and 1 part by mass per 100 parts by mass of water. The potassium iodide content is usually between 0.5 parts by mass and 20 parts by mass per 100 parts by mass of water. The temperature of the aqueous solution used for dyeing is usually between 20°C and 40°C. The immersion time (dyeing time) in this aqueous solution is usually between 20 seconds and 1,800 seconds.

[0038] On the other hand, when using dichroic organic dyes as dichroic pigments, the usual method involves immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic dye. The content of the dichroic organic dye in this aqueous solution is typically 1 × 10⁻¹⁶ per 100 parts by mass of water. -4 The amount is between parts by mass and 10 parts by mass, preferably 1 × 10 -3 The amount is between parts by mass and 1 part by mass, and more preferably 1 × 10 -3 Mass part or more 1×10 -2 The amount is less than or equal to parts by mass. This aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing aid. The temperature of the dichroic dye aqueous solution used for dyeing is usually between 20°C and 80°C. The immersion time (dyeing time) in this aqueous solution is usually between 10 seconds and 1,800 seconds.

[0039] Boric acid treatment after dyeing with a dichroic dye can usually be carried out by immersing the dyed polyvinyl alcohol-based resin film in an aqueous boric acid solution. The boric acid content in this aqueous boric acid solution is usually 2 to 15 parts by mass, preferably 5 to 12 parts by mass, per 100 parts by mass of water. When iodine is used as the dichroic dye, it is preferable that this aqueous boric acid solution contains potassium iodide, in which case the potassium iodide content is usually 0.1 to 15 parts by mass, preferably 5 to 12 parts by mass, per 100 parts by mass of water. The immersion time in the aqueous boric acid solution is usually 60 seconds to 1,200 seconds, preferably 150 seconds to 600 seconds, and more preferably 200 seconds to 400 seconds. The temperature for the boric acid treatment is usually 50°C or higher, preferably 50°C to 85°C, and more preferably 60°C to 80°C.

[0040] Polyvinyl alcohol-based resin films treated with boric acid are typically subjected to water washing. This washing can be carried out, for example, by immersing the boric acid-treated polyvinyl alcohol-based resin film in water. The water temperature during washing is usually between 5°C and 40°C, and the immersion time is usually between 1 second and 120 seconds.

[0041] After washing with water, the stretched film with the dichroic dye adsorbed is dried to obtain a stretched film with the dichroic dye adsorbed onto it. The drying process can be carried out, for example, using a hot air dryer or a far-infrared heater. The drying temperature is usually 30°C to 100°C, preferably 50°C to 80°C. The drying time is usually 60 seconds to 600 seconds, preferably 120 seconds to 600 seconds. The drying process reduces the moisture content of the stretched film with the dichroic dye adsorbed to a practical level. The moisture content is usually 5% by mass to 20% by mass, preferably 8% by mass to 15% by mass. If the moisture content falls below 5% by mass, the flexibility of the stretched film with the dichroic dye adsorbed is lost, and the stretched film with the dichroic dye adsorbed may be damaged or break after drying. Also, if the moisture content exceeds 20% by mass, the thermal stability of the stretched film with the dichroic dye adsorbed may deteriorate.

[0042] Next, we will describe the linearly polarized layer, which is a stretched layer (hereinafter sometimes abbreviated as the "stretched layer") on which a dichroic dye is adsorbed. The stretched layer on which a dichroic dye is adsorbed can usually be manufactured by applying a coating solution containing the above-mentioned polyvinyl alcohol-based resin onto a substrate to obtain a laminated film, uniaxially stretching the obtained laminated film, dyeing and adsorbing the polyvinyl alcohol-based resin layer of the uniaxially stretched laminated film with a dichroic dye, treating the film on which the dichroic dye is adsorbed with an aqueous boric acid solution, and washing with water after treatment with the aqueous boric acid solution. Examples of substrates include those exemplified in the description of the polarizer protective layer, which will be discussed later. The substrate may be peeled off from the stretched layer, or the substrate may be used as the polarizer protective layer. The thickness of the substrate may be, for example, 5 μm or more and 200 μm or less. When the substrate is incorporated into the laminate 1, the thickness of the substrate film is preferably 30 μm or less.

[0043] [A linear polarizing layer, which is a film coated with a dichroic dye and then cured.] Examples of films coated with and cured with a dichroic dye include films containing a cured product obtained by coating a substrate with a composition containing a liquid crystalline dichroic dye or a composition containing a dichroic dye and a liquid crystalline compound and then curing it.

[0044] Examples of substrates include those exemplified as thermoplastic resin films in the description of the polarizer protective layer, which will be discussed later. The substrate may be peeled off from a film coated with a dichroic dye and cured, or the substrate may be used as the polarizer protective layer. The thickness of the substrate may be, for example, 5 μm to 200 μm. When the substrate is incorporated into the laminate 1, the thickness of the substrate is preferably 30 μm or less. The substrate may have a hard coat layer, an anti-reflective layer, or an antistatic layer on at least one surface. The hard coat layer, anti-reflective layer, and antistatic layer may be formed only on the surface of the substrate on which the cured product is not formed, or only on the surface of the substrate on which the cured product is formed.

[0045] While a thin film coated with a dichroic dye and cured is preferable, if it is too thin, its strength decreases and it tends to have poor processability. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 μm to 3 μm.

[0046] Examples of films coated with a dichroic dye and cured include those described in Japanese Patent Publication No. 2013-37353 and Japanese Patent Publication No. 2013-33249, among others.

[0047] [Orientation layer] The alignment film can be placed between the substrate and a layer of a cured product of a composition containing a liquid crystalline dichroic dye, or a composition containing a dichroic dye and a liquid crystal compound. The alignment film has an alignment restricting force that causes the liquid crystal layer formed thereon to be liquid crystal oriented in a desired direction. Examples of alignment films include an alignment polymer layer formed of an alignment polymer, a photo-aligning polymer layer formed of a photo-aligning polymer, and a groove alignment film having an uneven pattern or multiple grooves on its surface. The thickness of the alignment film may be, for example, 10 nm to 500 nm, and preferably 10 nm to 200 nm.

[0048] An oriented polymer layer can be formed by applying a composition in which the oriented polymer is dissolved in a solvent to a substrate, removing the solvent, and performing a rubbing treatment as needed. In this case, the orientation restricting force in an oriented polymer layer formed from an oriented polymer can be arbitrarily adjusted depending on the surface condition of the oriented polymer and the rubbing conditions.

[0049] A photo-oriented polymer layer can be formed by applying a composition containing a polymer or monomer having photoreactive groups and a solvent to a substrate and irradiating it with polarized light. In this case, the orientation restricting force in the photo-oriented polymer layer can be arbitrarily adjusted by the polarized light irradiation conditions for the photo-oriented polymer, etc.

[0050] Glue alignment films can be formed, for example, by exposing and developing a photosensitive polyimide film surface through an exposure mask having patterned slits to form an uneven pattern; by forming an uncured layer of active energy ray curable resin on a plate-shaped master disc having grooves on its surface, and then transferring this layer to a substrate for curing; or by forming an uncured layer of active energy ray curable resin on a substrate, and then forming an uneven surface on this layer by pressing a roll-shaped master disc with uneven surfaces against it, and then curing it.

[0051] [Polarizer protective layer] The polarizer protection layer can be formed from, for example, a thermoplastic resin film or a coating layer. The film-like linear polarizer 110 may have a polarizer protection layer on only one side of the linear polarizer layer, or it may have polarizer protection layers on both sides. If the film-like linear polarizer 110 has polarizer protection layers on both sides of the linear polarizer layer, the polarizer protection layers may be of the same type or different types. If the polarizer protection layer is a thermoplastic resin film, the polarizer protection layer can be bonded to the linear polarizer layer via an adhesive layer described later. Also, if the polarizer protection layer is a thermoplastic resin film, a thermoplastic resin film equipped with a cured resin layer can be bonded to the linear polarizer layer as a polarizer protection layer positioned on the opposite side of the film-like phase difference layer 130 of the film-like linear polarizer 110. The film-like linear polarizer 110 preferably includes a thermoplastic resin film.

[0052] [Thermoplastic resin film] A thermoplastic resin film that can be used as a polarizer protective layer can be incorporated into the film-like linear polarizer plate 110 in a form laminated to one or both sides of the linear polarizer layer. The thermoplastic resin film may be, for example, a light-transmitting, preferably optically transparent, thermoplastic resin film. Examples include polyolefin resins such as chain polyolefin resins (polyethylene resins, polypropylene resins, polymethylpentene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); cellulose resins such as triacetylcellulose; polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polycarbonate resins; ethylene-vinyl acetate resins; polystyrene resins; polyamide resins; polyetherimide resins; (meth)acrylic resins such as polymethyl (meth)acrylate resins; polyimide resins; polyethersulfone resins; polysulfone resins; polyvinyl chloride resins; polyvinylidene chloride resins; polyvinyl alcohol resins; polyvinyl acetal resins; polyetherketone resins; polyetheretherketone resins; polyethersulfone resins; and polyamideimide resins. The thermoplastic resin can be used alone or in mixtures of two or more types. In particular, triacetylcellulose resin film, cyclic polyolefin resin film, and (meth)acrylic resin film are preferred from the viewpoint of strength and light transmittance.

[0053] The thickness of the thermoplastic resin film may be, for example, 30 μm or less, preferably 25 μm or less from the viewpoint of thinning, and usually 1 μm or more, preferably 5 μm or more, and more preferably 15 μm or more. The thermoplastic resin film may or may not have a phase difference.

[0054] Adhesives used for bonding the linearly polarized light layer to the thermoplastic resin film include active energy ray curable adhesives such as UV-curable adhesives, aqueous solutions of polyvinyl alcohol-based resins or aqueous solutions thereof containing a crosslinking agent, and water-based adhesives such as urethane emulsion adhesives. When bonding thermoplastic resin films to both sides of the linearly polarized light layer, the adhesives forming the two adhesive layers may be of the same type or different types. For example, when bonding thermoplastic resin films to both sides, one side may be bonded using a water-based adhesive and the other side using an active energy ray curable adhesive. UV-curable adhesives can be mixtures of radically polymerizable (meth)acrylic compounds and photo-radical polymerization initiators, or mixtures of cationic polymerizable epoxy compounds and photo-cationic polymerization initiators. Alternatively, cationic polymerizable epoxy compounds and radically polymerizable (meth)acrylic compounds can be used in combination, and photo-cationic polymerization initiators and photo-radical polymerization initiators can be used in combination as initiators. The thickness of the adhesive may be, for example, 0.1 μm or more and 5 μm or less.

[0055] When using an active energy ray curable adhesive, the adhesive is cured by irradiation with active energy rays after bonding. The light source for the active energy rays is not particularly limited, but active energy rays (ultraviolet rays) having an emission distribution of wavelengths of 400 nm or less are preferred. Specifically, low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, chemical lamps, black light lamps, microwave-excited mercury lamps, metal halide lamps, etc., are preferably used.

[0056] To improve the adhesion between the linearly polarized layer and the thermoplastic resin film, prior to bonding the linearly polarized layer and / or the thermoplastic resin film, surface treatments such as corona treatment, flame treatment, plasma treatment, ultraviolet irradiation treatment, primer application treatment, and saponification treatment may be applied to the bonding surface of the linearly polarized layer and / or the thermoplastic resin film.

[0057] [Coating layer] The polarizer protective layer formed from the coating layer may be obtained by applying and curing a cationic curable composition such as epoxy resin or a radical curable composition such as (meth)acrylate, or by applying and drying an aqueous solution of a polyvinyl alcohol-based resin, and may optionally contain plasticizers, ultraviolet absorbers, infrared absorbers, colorants such as pigments and dyes, fluorescent whitening agents, dispersants, heat stabilizers, light stabilizers, antistatic agents, antioxidants, lubricants, etc.

[0058] When the polarizer protective layer is a coating layer, the thickness of the polarizer protective layer may be, for example, 0.1 μm or more and 30 μm or less, and from the viewpoint of thinning, preferably 0.5 μm or more and 20 μm or less, and more preferably 1 μm or more and 10 μm or less.

[0059] [Film-like phase difference layer] The film-like phase difference layer 130 is laminated on the side of the film-like linear polarizing plate 110 opposite to the cured resin layer 100, via an adhesive layer 120. The film-like linear polarizing plate 110 can be flexible.

[0060] The film-like phase difference layer 130 may include one or more phase difference layers. The phase difference layers may be positive A layers such as λ / 4 layers or λ / 2 layers, and positive C layers. The phase difference layer may be formed from the liquid crystal curing layer described later, or from the resin film exemplified as the material for the thermoplastic resin film described above. The film-like phase difference layer 130 may further include the orientation layer and substrate described later.

[0061] The film-like phase difference layer 130 preferably includes a λ / 4 layer, and more preferably includes a λ / 4 layer and at least one of a λ / 2 layer and a positive C layer. When the phase difference layer includes a λ / 2 layer, the λ / 2 layer and the λ / 4 layer can be laminated in order from the film-like linear polarizer 110 side. When the phase difference layer includes a positive C layer, the λ / 4 layer and the positive C layer may be laminated in order from the film-like linear polarizer 110 side, or the positive C layer and the λ / 4 layer may be laminated in order from the film-like linear polarizer 110 side.

[0062] The thickness of the film-like phase difference layer 130 may be, for example, 0.1 μm or more and 50 μm or less, preferably 1 μm or more and 30 μm or less, and more preferably 0.5 μm or more and 15 μm or less.

[0063] The film-like phase difference layer 130 includes a liquid crystal curing layer. The liquid crystal curing layer is a layer of cured material hardened by polymerization of polymerizable liquid crystal compounds. The liquid crystal curing layer may be formed by polymerizing polymerizable liquid crystal compounds with each other in a liquid crystal orientation. The polymerizable liquid crystal compounds may be oriented in-plane or perpendicularly. When the polymerizable liquid crystal compounds are oriented in-plane, the liquid crystal curing layer becomes a positive A layer exhibiting in-plane phase difference. When the polymerizable liquid crystal compounds are oriented perpendicularly, it becomes a positive C layer exhibiting phase difference in the thickness direction. Polymerizable liquid crystal compounds are compounds that have polymerizable groups and can enter a liquid crystal state. The polymerizable liquid crystal compounds harden when the polymerizable groups react with each other, causing polymerization.

[0064] The liquid crystal curing layer of the film-like phase difference layer 130 may be one layer, two layers, or three or more layers. When the film-like phase difference layer 130 comprises two or more liquid crystal curing layers, the liquid crystal curing layers are usually laminated to each other via an adhesive layer. In addition to the liquid crystal curing layers and the adhesive layer that laminates them to each other, the film-like phase difference layer 130 may include a substrate and / or an alignment layer for aligning polymerizable liquid crystal compounds when forming the liquid crystal curing layers. When the film-like phase difference layer 130 has a substrate, the substrate is usually removed when the film-like phase difference layer 130 is laminated to a linear polarizing plate.

[0065] Examples of adhesives used in the adhesive layer include active energy ray curable adhesives such as ultraviolet curable adhesives, aqueous solutions of polyvinyl alcohol resins or aqueous solutions thereof containing a crosslinking agent, and water-based adhesives such as urethane emulsion adhesives. When the film-like phase difference layer 130 contains two or more adhesive layers, the adhesives may be of the same type or different types. The thickness of the adhesive layer may be, for example, 0.1 μm or more and 5 μm or less.

[0066] While there are no particular limitations on the types of polymerizable liquid crystal compounds, they can be classified into rod-shaped types (rod-shaped liquid crystal compounds) and disc-shaped types (disc-shaped liquid crystal compounds, discotic liquid crystal compounds) based on their shape. Furthermore, each of these can be further divided into low-molecular-weight and high-molecular-weight types. Generally, high-molecular-weight compounds refer to those with a degree of polymerization of 100 or more (Polymer Physics and Phase Transition Dynamics, by Masao Doi, p. 2, Iwanami Shoten, 1992). In the present invention, any polymerizable liquid crystal compound can be used. Furthermore, two or more rod-shaped liquid crystal compounds, two or more disc-shaped liquid crystal compounds, or mixtures of rod-shaped and disc-shaped liquid crystal compounds may be used. As a rod-shaped liquid crystal compound, for example, the one described in claim 1 of Japanese Patent Publication No. 11-513019 can be suitably used. As a disc-shaped liquid crystal compound, for example, paragraph

[0020] of Japanese Patent Application Publication No. 2007-108732...

[0067] Alternatively, those described in paragraphs

[0013] to

[0108] of Japanese Patent Publication No. 2010-244038 can be preferably used.

[0067] Two or more polymerizable liquid crystal compounds may be used in combination. In this case, at least one of them has two or more polymerizable groups in its molecule. That is, it is preferable that the hardened layer of the polymerizable liquid crystal compound is a layer formed by fixing the liquid crystal compound having polymerizable groups through polymerization. In this case, the layer does not need to exhibit liquid crystal properties anymore.

[0068] Polymerizable liquid crystal compounds have polymerizable groups capable of polymerization reactions. Preferred polymerizable groups include functional groups that can undergo addition polymerization reactions, such as polymerizable ethylenically unsaturated groups and cyclic polymerizable groups. More specifically, examples of polymerizable groups include (meth)acryloyl groups, vinyl groups, styryl groups, and allyl groups. Among these, (meth)acryloyl groups are preferred. Note that the (meth)acryloyl group is a concept that encompasses both methacryloyl groups and acryloyl groups.

[0069] The liquid crystalline properties of polymerizable liquid crystal compounds can be either thermotropic or lyotropic, and when thermotropic liquid crystals are classified by their degree of order, they can be either nematic or smectic.

[0070] A liquid crystal cured layer can be formed by coating, for example, an alignment layer with a composition containing a polymerizable liquid crystal compound (hereinafter also referred to as a phase difference layer forming composition) and irradiating it with active energy rays. The phase difference layer forming composition may contain components other than the polymerizable liquid crystal compound mentioned above. For example, it is preferable that the phase difference layer forming composition contains a polymerization initiator. Depending on the type of polymerization reaction, the polymerization initiator used may be selected, for example, a thermal polymerization initiator or a photopolymerization initiator. For example, examples of photopolymerization initiators include α-carbonyl compounds, acyloin ethers, α-hydrocarbon-substituted aromatic acyloin compounds, polynuclear quinone compounds, and combinations of triarylimidazole dimers and p-aminophenyl ketones. The amount of polymerization initiator used is preferably 0.01% to 20% by mass, and more preferably 0.5% to 5% by mass, relative to the total solid content in the coating liquid. A cured product refers to a state in which the formed layer can exist independently without deformation or flow.

[0071] Furthermore, the composition for forming the phase difference layer may contain polymerizable monomers from the viewpoint of uniformity and strength of the coating film. Examples of polymerizable monomers include radical polymerizable or cationic polymerizable compounds. Among these, polyfunctional radical polymerizable monomers are preferred.

[0072] Furthermore, it is preferable that the polymerizable monomer can copolymerize with the polymerizable liquid crystal compound described above. The amount of polymerizable monomer used is preferably 1% to 50% by mass, and more preferably 2% to 30% by mass, relative to the total mass of the polymerizable liquid crystal compound.

[0073] Furthermore, the composition for forming the phase difference layer may contain a surfactant from the viewpoint of uniformity and strength of the coating film. Examples of surfactants include conventionally known compounds. Among these, fluorine-based compounds are particularly preferred.

[0074] Furthermore, the composition for forming the phase difference layer may contain a solvent, and organic solvents are preferably used. Examples of organic solvents include amides (e.g., N,N-dimethylformamide), sulfoxides (e.g., dimethyl sulfoxide), heterocyclic compounds (e.g., pyridine), hydrocarbons (e.g., benzene, hexane), alkyl halides (e.g., chloroform, dichloromethane), esters (e.g., methyl acetate, ethyl acetate, butyl acetate), ketones (e.g., acetone, methyl ethyl ketone), and ethers (e.g., tetrahydrofuran, 1,2-dimethoxyethane). Among these, alkyl halides and ketones are preferred. In addition, two or more organic solvents may be used in combination.

[0075] Furthermore, the phase difference layer forming composition may contain various orientation agents, such as vertical orientation promoters including polarizer interface-side vertical orientation agents and air interface-side vertical orientation agents, as well as horizontal orientation promoters including polarizer interface-side horizontal orientation agents and air interface-side horizontal orientation agents. In addition, the phase difference layer forming composition may also contain adhesion improvers, plasticizers, polymers, and the like, in addition to the components mentioned above.

[0076] The above-mentioned active energy rays include ultraviolet light, visible light, electron beams, and X-rays, and are preferably ultraviolet light. Examples of light sources for the active energy rays include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, xenon lamps, halogen lamps, carbon arc lamps, tungsten lamps, gallium lamps, excimer lasers, LED light sources emitting in the wavelength range of 380-440 nm, chemical lamps, black light lamps, microwave-excited mercury lamps, metal halide lamps, and the like.

[0077] The irradiation intensity of ultraviolet light is typically 100 mW / cm² for ultraviolet B rays (wavelength range 280 nm to 310 nm). 2 More than 3,000mW / cm 2 The following applies: The ultraviolet irradiation intensity is preferably in the wavelength range effective for activating the cationic polymerization initiator or radical polymerization initiator. The irradiation time with ultraviolet light is usually 0.1 seconds to 10 minutes, preferably 0.1 seconds to 5 minutes, more preferably 0.1 seconds to 3 minutes, and even more preferably 0.1 seconds to 1 minute.

[0078] Ultraviolet light can be irradiated in one or multiple passes. Depending on the polymerization initiator used, the integrated light intensity at a wavelength of 365 nm is 700 mJ / cm². 2 Preferably, it should be 1,100 mJ / cm² or higher. 2 It is more preferable to set it to 1,300 mJ / cm² or higher. 2 It is even more preferable to set it to the above. Setting the above integrated light intensity is advantageous in increasing the polymerization rate of the polymerizable liquid crystal compound constituting the liquid crystal curing layer and improving heat resistance. The integrated light intensity at a wavelength of 365 nm is 2,000 mJ / cm². 2 Preferably, the following is used: 1,800 mJ / cm² 2 The following is more preferable. Using the above integrated light intensity may cause discoloration of the liquid crystal hardened layer.

[0079] The thickness of the liquid crystal curing layer is preferably 0.5 μm or more. Furthermore, the thickness of the liquid crystal curing layer is preferably 10 μm or less, and more preferably 5 μm or less. The above-mentioned upper and lower limits can be combined arbitrarily. If the thickness of the liquid crystal curing layer is greater than or equal to the lower limit, sufficient durability can be obtained. If the thickness of the liquid crystal curing layer is less than or equal to the upper limit, it can contribute to thinning the laminate 1. The thickness of the liquid crystal curing layer can be adjusted to obtain a desired in-plane phase difference value and a phase difference value in the thickness direction for a layer that gives a phase difference of λ / 4, a layer that gives a phase difference of λ / 2, or a positive C layer.

[0080] The film-like phase difference layer 130 may contain multiple phase difference layers, each having different phase difference characteristics, laminated together. Each phase difference layer may be laminated using an adhesive, or a composition containing a polymerizable liquid crystal compound may be coated onto the surface of an already formed phase difference layer and cured.

[0081] [Base material] A layer containing a cured polymerizable liquid crystal compound can be formed, for example, on an orientation layer provided on a substrate. The substrate may be a long substrate that has the function of supporting the orientation layer. This substrate functions as a release support and can support the liquid crystal cured layer and orientation layer for transfer. Furthermore, it is preferable that its surface has sufficient adhesive strength to be peelable. Examples of substrates include light-transmitting, preferably optically transparent, thermoplastic resin films. Examples of thermoplastic resin films include those exemplified in the description of the polarizer protective layer above.

[0082] The substrate may be subjected to various anti-blocking treatments. Examples of anti-blocking treatments include easy-adhesion treatments, treatments involving the incorporation of fillers, and embossing (knurling). By applying such anti-blocking treatments to the substrate, it is possible to effectively prevent the substrates from sticking together when being wound, so-called blocking, and productivity tends to improve.

[0083] [Orientation layer] A layer containing a cured polymerizable liquid crystal compound is formed on the substrate via an orientation layer. That is, the substrate and the orientation layer are laminated in that order, and the layer containing the cured polymerizable liquid crystal compound is laminated on the orientation layer.

[0084] The alignment layer is not limited to a vertical alignment layer; it may also be an alignment layer that horizontally aligns the molecular axis of the polymerizable liquid crystal compound, or an alignment layer that tilts the molecular axis of the polymerizable liquid crystal compound. Preferably, the alignment layer has solvent resistance that prevents dissolution by coating with a composition containing the polymerizable liquid crystal compound (described later), and also has heat resistance for solvent removal and heat treatment for alignment of the liquid crystal compound. Examples of alignment layers include an alignment layer containing an aligning polymer, a photo-alignment film, and a groove alignment layer that forms an uneven pattern or multiple grooves on its surface for alignment. The thickness of the alignment layer is typically in the range of 10 nm to 10,000 nm.

[0085] Furthermore, the alignment layer may have the function of supporting the liquid crystal curing layer and may also function as a release support. It may be able to support the liquid crystal curing layer for transfer and may also have sufficient adhesive strength on its surface to allow for peeling.

[0086] As the resin used for the orientation layer, a resin obtained by polymerizing polymerizable compounds is used. A polymerizable compound is a compound having polymerizable groups, and is usually a non-liquid crystallinity polymerizable non-liquid crystallinity compound that does not become liquid crystal. The polymerizable groups of the polymerizable compound react with each other, and the polymerizable compound polymerizes to form a resin. As for such a resin, it is not particularly limited as long as it is used as an orientation layer to orient polymerizable liquid crystal compounds during the formation stage of the liquid crystal cured layer and is not included in the liquid crystal cured layer, as long as it is a resin that is known to be used as a material for orientation layers. Conventional known monofunctional or polyfunctional (meth)acrylate monomers cured under a polymerization initiator can be used, for example. Specifically, examples of (meth)acrylate monomers include 2-ethylhexyl acrylate, cyclohexyl acrylate, diethylene glycol mono-2-ethylhexyl ether acrylate, diethylene glycol monophenyl ether acrylate, tetraethylene glycol monophenyl ether acrylate, trimethylolpropane triacrylate, lauryl acrylate, lauryl methacrylate, isobornyl acrylate, isobornyl methacrylate, 2-phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, 2-hydroxypropyl acrylate, benzyl acrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl methacrylate, benzyl methacrylate, cyclohexyl methacrylate, methacrylic acid, urethane acrylate, and the like. The resin may be one of these or a mixture of two or more of them. The orientation layer can be peeled off together with the substrate before or after the process of laminating it with a film-like linear polarizing plate 110 or the like, after the phase difference layer 30 has been formed.

[0087] Furthermore, an alignment layer can be included in the liquid crystal cured layer for the purpose of improving peelability from the substrate and imparting film strength to the liquid crystal cured layer. When the liquid crystal cured layer includes an alignment layer, it is preferable to use a cured product obtained by curing monofunctional or bifunctional (meth)acrylate monomers, imide monomers, or vinyl ether monomers as the resin used for the alignment layer. Examples of monofunctional (meth)acrylate monomers include alkyl (meth)acrylates with 4 to 16 carbon atoms, β-carboxyalkyl (meth)acrylates with 2 to 14 carbon atoms, alkylated phenyl (meth)acrylates with 2 to 14 carbon atoms, methoxypolyethylene glycol (meth)acrylate, phenoxypolyethylene glycol (meth)acrylate, and isovonyl (meth)acrylate. Examples of bifunctional (meth)acrylate monomers include 1,3-butanediol di(meth)acrylate; 1,3-butanediol (meth)acrylate; 1,6-hexanediol di(meth)acrylate; ethylene glycol di(meth)acrylate; diethylene glycol di(meth)acrylate; neopentyl glycol di(meth)acrylate; triethylene glycol di(meth)acrylate; tetraethylene glycol di(meth)acrylate; polyethylene glycol diacrylate; bis(acryloyloxyethyl) ether of bisphenol A; ethoxylated bisphenol A di(meth)acrylate; propoxylated neopentyl glycol di(meth)acrylate; ethoxylated neopentyl glycol di(meth)acrylate and 3-methylpentanediol di(meth)acrylate. Furthermore, examples of imide-based resins obtained by curing imide-based monomers include polyamides and polyimides. The imide-based resin may be one of these types or a mixture of two or more types. Furthermore, the resin forming the orientation layer may contain monomers other than monofunctional or bifunctional (meth)acrylate monomers, imide monomers, and vinyl ether monomers. The content of monofunctional or bifunctional (meth)acrylate monomers, imide monomers, and vinyl ether monomers may be 50% by mass or more of the total monomers, preferably 55% by mass or more, and more preferably 60% by mass or more.

[0088] When the orientation layer is included in the film-like phase difference layer 130, the thickness of the orientation layer is usually in the range of 10 nm to 10,000 nm. When the orientation of the film-like phase difference layer 130 is in-plane orientation with respect to the film surface, the thickness of the orientation layer is preferably 10 nm to 1,000 nm. When the orientation of the film-like phase difference layer 130 is perpendicular orientation with respect to the film surface, the thickness is preferably 100 nm to 10,000 nm. When the thickness of the orientation layer is within the above range, the peelability of the substrate and appropriate film strength can be provided.

[0089] [Adhesive layer] The adhesive layer 120 for bonding the film-like linear polarizing plate 110 and the film-like phase difference layer 130 can usually be an adhesive layer formed from a pressure-sensitive adhesive (hereinafter also referred to as adhesive).

[0090] The storage modulus E(Pa) of the adhesive layer 120 at 25°C is preferably 3.0 × 10⁻⁶. 4 Pa or higher, more preferably 6.0 × 10 4 Pa or higher, and more preferably 9.0 × 10⁻⁶ 4 It is Pa or higher. The storage modulus of the adhesive layer 120 at 25°C is typically 1.0 × 10⁻⁶. 7 Pa or less, more preferably 1.0 × 10 6 It is less than or equal to Pa. The storage modulus of the adhesive layer 120 at 25°C can be measured according to the measurement method described in the Examples section below.

[0091] The thickness of the adhesive layer 120 may be, for example, 50 μm or less, preferably 45 μm or less, and more preferably 30 μm or less. The thickness of the adhesive layer 120 may be, for example, 1 μm or more, preferably 2 μm or more, and more preferably 3 μm or more.

[0092] The adhesive layer 120 can be composed of an adhesive composition mainly composed of resins such as (meth)acrylic, rubber, urethane, ester, silicone, or polyvinyl ether. Among these, an adhesive composition using a (meth)acrylic resin as the base polymer is preferred from the viewpoint of transparency, weather resistance, heat resistance, and storage modulus. The adhesive composition may be of the active energy ray curing type or thermosetting type.

[0093] As the (meth)acrylic resin (base polymer) used in the adhesive composition, polymers or copolymers using one or more (meth)acrylic acid esters as monomers, such as butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate, are preferably used. It is preferable to copolymerize polar monomers into the base polymer. Examples of polar monomers include monomers having carboxyl groups, hydroxyl groups, amide groups, amino groups, epoxy groups, etc., such as (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate, and glycidyl (meth)acrylate.

[0094] The adhesive composition may contain only the above-mentioned base polymer, but usually further contains a crosslinking agent. Examples of crosslinking agents include divalent or higher metal ions that form metal carboxylate salts with carboxyl groups; polyamine compounds that form amide bonds with carboxyl groups; polyepoxy compounds or polyols that form ester bonds with carboxyl groups; and polyisocyanate compounds that form amide bonds with carboxyl groups. Among these, polyisocyanate compounds are preferred.

[0095] The adhesive layer 120 can be formed, for example, by preparing an adhesive solution by dissolving or dispersing an adhesive composition in an organic solvent such as toluene or ethyl acetate, and then directly coating this solution onto the target surface of the laminate to form the adhesive layer, or by forming the adhesive layer in a sheet shape on a release-treated separator film and then transferring it to the target surface of the film-like linear polarizing plate 110 or film-like phase difference layer 130.

[0096] The separator film can be a film made of polyethylene resin such as polyethylene, polypropylene resin such as polypropylene, or polyester resin such as polyethylene terephthalate. Among these, a stretched film of polyethylene terephthalate is preferred.

[0097] The adhesive layer 120 may contain optional components, such as fillers consisting of glass fibers, glass beads, resin beads, metal powders or other inorganic powders, pigments, colorants, antioxidants, UV absorbers, antistatic agents, etc.

[0098] Examples of antistatic agents include ionic compounds, conductive fine particles, and conductive polymers, but ionic compounds are preferred. The cationic component constituting the ionic compound may be either an inorganic or organic cation. Examples of organic cations include pyridinium cations, imidazolium cations, ammonium cations, sulfonium cations, phosphonium cations, piperidinium cations, and pyrrolidinium cations, while examples of inorganic cations include lithium ions and potassium ions. On the other hand, the anionic component constituting the ionic compound may be either an inorganic or organic anion, but an anionic component containing a fluorine atom is preferred because it gives an ionic compound with excellent antistatic properties. An anionic component containing a fluorine atom is the hexafluorophosphate anion [(PF6] - )], bis(trifluoromethanesulfonyl)imide anion [(CF3SO2)2N -]anion, bis(fluorosulfonyl)imide anion [(FSO2)2N - Examples include anions.

[0099] [Other layers] The laminate 1 may further include, for example, at least one of a bonding layer and a protective film.

[0100] [Bonding layer] The laminate 1 may have a bonding layer positioned on the outermost surface of the film-like phase difference layer 130. The bonding layer can be a layer for bonding a touch sensor panel, an image display element, etc., to the laminate 1. The bonding layer is usually composed of an adhesive. Any conventionally known adhesive can be used as the adhesive constituting the bonding layer without particular limitations, and adhesives having a base polymer such as an acrylic polymer, a urethane polymer, a silicone polymer, or a polyvinyl ether polymer can be used. In addition, active energy ray curing adhesives, thermosetting adhesives, etc., may also be used.

[0101] [Protective film] The protective film can be placed on the cured resin layer 100 side of the laminate 1. The laminate 1 may include a protective film to protect its surface, typically the surface of the cured resin layer. The protective film, along with its adhesive layer, is peeled off after the polarizing plate is bonded to, for example, an image display element or other optical component.

[0102] The protective film is composed of, for example, a base film and an adhesive layer laminated thereon. The above-described explanation for the bonding layer applies to the adhesive layer. The resin constituting the base film can be a thermoplastic resin such as polyethylene resin, polypropylene resin, polyester resin such as polyethylene terephthalate or polyethylene naphthalate, or polycarbonate resin. Preferably, it is a polyester resin such as polyethylene terephthalate.

[0103] The thickness of the protective film is not particularly limited, but it is preferably in the range of 20 μm to 200 μm. When the thickness of the substrate is 20 μm or more, the laminate 1 tends to be easier to strengthen.

[0104] [Layer structure of the laminate] Figure 2 is a schematic cross-sectional view showing another example of the layer structure of the laminate. The laminate 2 shown in Figure 2 comprises, in this order, a cured resin layer 100, a film-like linear polarizing plate 110, an adhesive layer 120, and a film-like phase difference layer 130. The film-like linear polarizing plate 110 comprises a polarizer protective layer 111, an adhesive layer 112, and a linear polarizing layer 113. The film-like phase difference layer 130 comprises a first liquid crystal curing layer 131, a first adhesive layer 132, and a second liquid crystal curing layer 133.

[0105] Figure 3 is a schematic cross-sectional view showing yet another example of the layer structure of a laminate. The laminate 3 shown in Figure 3 comprises, in this order, a protective film 140, a cured resin layer 100, a film-like linear polarizer 110, an adhesive layer 120, a film-like phase difference layer 130, and a bonding layer 150. The film-like linear polarizer 110 comprises a polarizer protective layer 111, an adhesive layer 112, and a linear polarizer layer 113. The film-like phase difference layer 130 comprises a first liquid crystal curing layer 131, a first adhesive layer 132, a second liquid crystal curing layer 133, a second adhesive layer 134, and a third liquid crystal curing layer 135.

[0106] [Method for manufacturing laminates] The laminate can be manufactured by a method that includes a bonding step of bonding a film-like linear polarizing plate 110 having a cured resin layer 100 and a film-like phase difference layer 130 via an adhesive layer 120. In the bonding step, when bonding layers to each other via a bonding layer, it is preferable to apply a surface activation treatment, such as corona treatment, to one or both of the bonding surfaces in order to improve adhesion. The cured resin layer 100, the film-like linear polarizing plate 110, and the film-like phase difference layer 130 can each be manufactured as described above.

[0107] The adhesive layer 120 can be prepared as an adhesive sheet. The adhesive sheet can be manufactured by, for example, dissolving or dispersing an adhesive composition in an organic solvent such as toluene or ethyl acetate to prepare an adhesive liquid, forming a sheet of adhesive on a release film that has been treated for mold release, and then laminating another release film onto the adhesive layer. The layers can be laminated by laminating the adhesive sheet, from which one release film has been peeled off, to one layer, then peeling off the other release film and laminating the other layer.

[0108] For applying the adhesive liquid onto the release film, conventional coating techniques such as die coaters, comma coaters, reverse roll coaters, gravure coaters, rod coaters, wire bar coaters, doctor blade coaters, and air doctor coaters can be used.

[0109] The release film is preferably composed of a plastic film and a release layer. Examples of plastic films include polyester films such as polyethylene terephthalate film, polybutylene terephthalate film, and polyethylene naphthalate film, and polyolefin films such as polypropylene film. The release layer can be formed, for example, from a release layer forming composition. The main components (resins) constituting the release layer forming composition are not particularly limited, but examples include silicone resins, alkyd resins, acrylic resins, and long-chain alkyl resins.

[0110] The method for manufacturing the laminate may further include a polishing step of polishing the end faces of the laminate. By including a polishing step in the method for manufacturing the laminate, a laminate having polished end faces can be obtained.

[0111] The polishing process will be explained with reference to Figure 4. The polishing process includes, for example, the following steps: [a] A first step of stacking multiple laminates to obtain a laminate W, and [b] A second step in which the end face of the laminated material W is cut by moving a rotary tool 60, which has a cutting blade and rotates around a rotation axis R, relative to the laminated material W in a direction parallel to the end face of the laminated material W and perpendicular to the lamination direction. It can include...

[0112] In the method for manufacturing the laminate 1, for example, after performing the first step ([a] above), polishing can be performed on the four sides of the laminate 1, which has a rectangular shape in plan view, according to the second step ([b] above). Next, notching can be performed by polishing one of the corners and / or one of the four sides of the rectangular laminate 1 according to the second step ([b] above) to form a notched portion.

[0113] The first step is to obtain a laminate W by stacking multiple raw material laminates that have been cut into a predetermined shape. The number of raw material laminates included in the laminate W is not particularly limited, but the laminate W may be, for example, made by stacking 100 to 500 laminates. The laminates that make up the laminate W may be obtained by cutting, for example, a long laminate having a layered structure of laminates.

[0114] The second step involves cutting the end face of the laminate W obtained in the first step using a rotary tool 60 to form a laminate having a polished end face.

[0115] The cutting process in the second step can be performed using a device equipped with a support unit 50 and two rotary tools 60, as shown in Figure 4, for example. The support unit 50 presses the laminated material W from above and below to prevent the laminated material W itself from moving during cutting and to fix the stacked laminated material so that it does not shift. The rotary tools 60 are used for cutting the end faces of the laminated material W and can rotate around a rotation axis R.

[0116] The support section 50 may include a flat substrate (means for moving the laminate W) 51; a gate-shaped frame 52 placed on the substrate 51; a rotary table 53 placed on the substrate 51 that can rotate about a central axis; and a cylinder 54 provided on the frame 52 opposite the rotary table 53 and capable of moving up and down. The laminate W is held in place by the rotary table 53 and the cylinder 54 via a jig 55.

[0117] The rotary tool 60 has a disc-shaped rotating body that rotates around a rotation axis R. The direction of rotation of the rotating body is indicated by the arrow in Figure 4. Multiple cutting blades (for example, 2 to 10, preferably 3 to 7) are arranged on the surface of the rotating body (the surface facing the end face of the laminate W and parallel to the end face) at intervals in the direction of rotation of the rotating body. It is preferable that the rotation axis R is set to pass through the center of the surface of the rotating body. The cutting blades are provided so as to protrude from the surface of the rotating body toward the end face of the laminate W, and the end face of the laminate W can be cut by rotating the rotating body around the rotation axis R with the cutting blades in contact with the end face of the laminate W.

[0118] Two rotary tools 60 are provided on both sides of the substrate 51, facing each other. The rotary tools 60 are movable in the direction of the rotation axis R according to the size of the laminate W, and the substrate 51 is movable so as to pass between the two rotary tools 60. For cutting, the laminate W is fixed to the support part 50, the position of the rotary tools 60 in the direction of the rotation axis R is appropriately adjusted, and the substrate 51 is moved so that the laminate W passes between the two opposing rotary tools 60 while the rotary tools 60 are rotated around their rotation axis R. This makes it possible to perform cutting by moving the rotary tools 60 relative to the laminate W in a direction parallel to the end face of the laminate W and perpendicular to the lamination direction, while bringing the cutting blades of the rotary tools 60 into contact with the opposite exposed end faces of the laminate W and removing these end faces.

[0119] The relative travel speed between the laminate W and the rotary tool 60 can be selected from a range of, for example, 200 mm / min to 5000 mm / min (more typically, a range of 500 mm / min to 3000 mm / min). The rotational speed of the rotary tool 60 can be selected from a range of, for example, 2000 rpm to 8000 rpm (more typically, a range of 2500 rpm to 6000 rpm).

[0120] As described above, the laminate of the present invention can minimize cracks that occur in the cured resin layer and the liquid crystal cured layer during the polishing process.

[0121] <Image display device> The laminate of the present invention can be used in an image display device. An image display device is a device having an image display panel and including a light-emitting element or light-emitting device as a light source. Examples of image display devices include liquid crystal displays, organic electroluminescent (EL) displays, inorganic electroluminescent (EL) displays, touch panel displays, etc. The laminate can be placed on the viewing side of the image display panel. The laminate can be laminated on the image display device via a bonding layer.

[0122] The image display device may be a flexible image display device. A flexible image display device is a foldable image display device. The flexible image display device is composed of a laminate for flexible image display devices and an organic EL display panel. In the flexible image display device, the laminate for flexible image display devices is positioned on the viewing side relative to the organic EL display panel. The laminate for flexible image display devices may include a front panel (described later), the laminate of the present invention, and a touch sensor. The stacking order of these front panel, laminate and touch sensor is arbitrary. It is preferable that the stacking order is front panel, laminate of the present invention, and touch sensor from the viewing side. It is also preferable that the stacking order is front panel, touch sensor, and laminate of the present invention from the viewing side. It is preferable that a polarizing plate is present on the viewing side of the touch sensor, as this makes the wiring pattern of the touch sensor less visible and improves the visibility of the displayed image. Each component can be stacked using an adhesive, glue, etc. Furthermore, a light-shielding pattern may be formed on at least one surface of any of the layers of the front panel, polarizing plate, or touch sensor.

[0123] [Front plate] A front panel may be placed on the viewing side of the laminate of the present invention. The front panel can be laminated to the laminate via an adhesive layer. Examples of the adhesive layer include the aforementioned tack layer and adhesive layer.

[0124] Examples of front panels include glass and resin films with a hard coat layer on at least one surface. For example, high-transparency glass or tempered glass can be used as the glass. Chemically strengthened glass is preferred, especially when using a thin transparent surface material. The thickness of the glass can be, for example, 100 μm to 5 mm.

[0125] A front panel comprising a hard coat layer on at least one surface of a resin film can have flexible properties rather than being rigid like existing glass. The thickness of the hard coat layer is not particularly limited and may be, for example, 5 to 100 μm.

[0126] The resin film may be a film formed from polymers such as norbornene or polycyclic norbornene monomers containing monomer units of cycloolefins, cellulose (diacetylcellulose, triacetylcellulose, acetylcellulose butyrate, isobutyl ester cellulose, propionylcellulose, butyrylcellulose, acetylpropionylcellulose) ethylene-vinyl acetate copolymer, polycycloolefin, polyester, polystyrene, polyamide, polyetherimide, polyacrylic, polyimide, polyamideimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyetherether ketone, polyethersulfone, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyurethane, epoxy, etc. The resin film can be unstretched, uniaxially oriented, or biaxially oriented. These polymers can be used individually or in mixtures of two or more. Preferred resin films include polyamide-imide films or polyimide films with excellent transparency and heat resistance, uniaxial or biaxially oriented polyester films, cycloolefin derivative films with excellent transparency and heat resistance that can accommodate larger film sizes, polymethyl methacrylate films, and triacetylcellulose and isobutyl ester cellulose films that are transparent and optically anisotropic. The thickness of the resin film may be 5 to 200 μm, preferably 20 to 100 μm.

[0127] [Light-blocking pattern] A light-shielding pattern (bezel) can be formed on the display element side of the front panel. The light-shielding pattern can conceal the wiring of the display device so that it is not visible to the user. The color and / or material of the light-shielding pattern is not particularly limited and can be formed from a resin material having various colors such as black, white, and gold. In one embodiment, the thickness of the light-shielding pattern may be 2 μm to 50 μm, preferably 4 μm to 30 μm, and more preferably in the range of 6 μm to 15 μm. Furthermore, a shape can be given to the light-shielding pattern to suppress the inclusion of air bubbles due to the step between the light-shielding pattern and the display part, and to suppress the visibility of the boundary.

[0128] [Touch sensor] Touch sensors are used as input means. Various types of touch sensors have been proposed, including resistive, surface acoustic wave, infrared, electromagnetic induction, and capacitive types, and any of these types is acceptable. Among these, the capacitive type is preferred. A capacitive touch sensor is divided into an active region and an inactive region located on the outer edge of the active region. The active region is the region corresponding to the area where the screen is displayed on the display panel (display area) and is the region where the user's touch is detected, while the inactive region is the region corresponding to the area where the screen is not displayed on the display device (non-display area). The touch sensor may include a substrate with flexible properties; a sensing pattern formed in the active region of the substrate; and sensing lines formed in the inactive region of the substrate for connecting to an external drive circuit via the sensing pattern and pad portion. As the substrate with flexible properties, the same material as the transparent substrate of the window can be used. From the viewpoint of suppressing cracks that may occur in the touch sensor, the substrate of the touch sensor should have a toughness of 2,000 MPa% or more. More preferably, the toughness should be 2,000 MPa% to 30,000 MPa%. Here, toughness is defined as the area under the curve up to the fracture point in the stress-strain curve (MPa) obtained through tensile testing of polymer materials. [Examples]

[0129] The present invention will be described in more detail below with reference to examples. In the examples, "%" and "parts" refer to mass%, and parts, respectively, unless otherwise specified.

[0130] [Martens hardness] A cyclic olefin resin (COP) film with a hard coat (HC) layer, as used in the examples and comparative examples, was cut to a size of 40 mm x 40 mm. A glass plate was bonded to the cyclic olefin resin film side via an adhesive layer to prepare a measurement sample. Under an atmosphere of 23°C and 55% relative humidity, a load of 1 mN / 5 seconds was applied to the hard coat layer side surface of the measurement sample using an ultramicrohardness tester (FISCHERSCOPE HM2000: manufactured by Fischer Instruments Co., Ltd.), and the Martens hardness at 23°C was measured with a creep time (time to maintain a load of 1 mN) of 5 seconds.

[0131] [Storage modulus] The storage modulus of the adhesive layer was measured by the following method. Multiple adhesive layers were laminated to a thickness of 0.2 mm. From the resulting adhesive layers, a cylindrical object with a diameter of 8 mm was punched out and used as a sample for measuring the storage modulus E. For the above samples, the storage modulus (Pa) was measured using the torsional shear method with a viscoelasticity measuring device (Physica, MCR300) in accordance with JIS K7244-6, under the following conditions. [Measurement conditions] Normal Force FN:1N Distortion γ: 1% Frequency: 1Hz Temperature: 25℃

[0132] [Thickness of the layer] The measurement was performed using a contact-type film thickness measuring device (Nikon Corporation's "MS-5C").

[0133] [Example 1] (Fabrication of laminates) A linearly polarized layer (8 μm thick) was prepared by adsorbing and oriented iodine onto a polyvinyl alcohol-based resin film. On one side of this linearly polarized layer, a Martens hardness of 2.5 × 10 was applied via a water-based adhesive. 2 A cyclic olefin resin (COP) film (25 μm thick) (hereinafter sometimes referred to as "HC(A)-COP film") with a hard coat (HC) layer formed on it was laminated with the COP film side (opposite side from the HC layer side). On the HC layer of this polarizer protective layer, the acrylic adhesive layer side of a protective film (53 μm thick), which had an acrylic adhesive layer (15 μm thick) formed on a polyester resin film (38 μm thick), was laminated. On the other side of the linear polarizing layer, a triacetylcellulose (TAC) film (20 μm thick) as a polarizer protective layer was laminated via a water-based adhesive. This resulted in a film-type linear polarizer with a protective film (1). The film-type linear polarizer with a protective film (1) consisted of the protective film (polyester resin film, acrylic adhesive layer), HC(A)-COP film (HC layer, COP film), linear polarizing layer, and TAC film laminated in this order. The film-type linear polarizing plate (1), with the protective film (thickness 53 μm) removed, was adjusted to have transmission characteristics of 0.01% or less at 380 nm, 0.07% or less at 390 nm, 35% or more at 440 nm, 41% or more at 550 nm, and 41.5% or more at 610 nm.

[0134] Next, a film-like phase difference layer was prepared in which a λ / 4 plate (thickness 2 μm), which is a cured layer of polymerizable liquid crystal compound, an adhesive curing layer of UV-curable adhesive (thickness 2 μm), and a positive C plate (thickness 3 μm), which is a cured layer of polymerizable liquid crystal compound, were laminated in this order. The TAC film of the protective film-type linear polarizing plate (1) and the λ / 4 plate of the film-like phase difference layer were subjected to a storage modulus of 1.2 × 10⁻⁶ at 25°C. 5The plates were bonded using an adhesive layer (15 μm thick) made of Pa adhesive. Subsequently, a release film-attached laminate layer (1) was prepared by forming a laminate layer (25 μm thick) on a release film (38 μm thick) using an acrylic adhesive. The laminate layer of the release film-attached laminate layer (1) was laminated onto the positive C plate side of the film-like phase difference layer bonded to the protective film-attached film-like linear polarizing plate (1), and the laminate was cut into a rectangle with a long side length of 37 mm and a short side length of 35 mm to obtain a laminate (1). The laminate (1) consisted of the protective film-attached film-like linear polarizing plate (1) (protective film, HC(A)-COP film, linear polarizing layer, and TAC film), adhesive layer, film-like phase difference layer (λ / 4 plate, laminate layer, positive C plate), and release film-attached laminate layer (1) (laminated layer, release film) laminated in this order. In laminate (1), the thickness of the laminated portion from the film-like linear polarizing plate (HC(A)-COP film, linear polarizing layer, TAC film) to the film-like phase difference layer (λ / 4 plate, adhesive curing layer, positive C plate) was 77 μm. Furthermore, the direction of the short side of laminate (1) was parallel to the absorption axis of the linear polarizing layer.

[0135] (Preparation of laminates with polished end faces) Using the apparatus shown in Figure 4, a laminate W was prepared by stacking raw material laminates according to the procedure of the first step described above, and polishing was performed on the end faces corresponding to the four sides of the raw material laminate according to the procedure of the second step described above. In all of the above polishing operations, the relative movement speed between the laminate W and the rotary tool 60 was 2100 mm / min, and the rotation speed of the rotary tool was 5400 rpm.

[0136] After polishing the end faces, the length of cracks occurring at the peripheral edges of the laminate was measured by observing them with an optical microscope.

[0137] [Comparative Example 1] The TAC film of the protective film-coated linear polarizing plate (1) and the λ / 4 plate of the film-like phase difference layer have a storage modulus of 2.5 × 10 at 25°C. 4A laminate was obtained using the same procedure as in Example 1, except that it was bonded with an adhesive layer (17 μm thick) made of Pa adhesive. The length of cracks occurring at the peripheral edges of the obtained laminate was measured by observing the peripheral edges of the laminate with an optical microscope.

[0138] [Comparative Example 2] A linearly polarized layer (8 μm thick) was prepared by adsorbing and oriented iodine onto a polyvinyl alcohol-based resin film. On one side of this linearly polarized layer, a layer with a Martens hardness of 2.3 × 10⁻¹ was applied via a water-based adhesive. 2 A cyclic olefin resin (COP) film (25 μm thick) (hereinafter sometimes referred to as "HC(B)-COP film") with a hard coat (HC) layer formed on it was laminated with the COP film side (opposite side from the HC layer side). On the HC layer of this polarizer protective layer, the acrylic adhesive layer side of a protective film (53 μm thick), which had an acrylic adhesive layer (15 μm thick) formed on a polyester resin film (38 μm thick), was laminated. On the other side of the linear polarizing layer, a triacetylcellulose (TAC) film (20 μm thick) as a polarizer protective layer was laminated via a water-based adhesive. This resulted in a film-type linear polarizer with a protective film (1). The film-type linear polarizer with a protective film (1) consisted of the protective film (polyester resin film, acrylic adhesive layer), HC(B)-COP film (HC layer, COP film), linear polarizing layer, and TAC film laminated in this order. This polarizing plate was adjusted to have transmission characteristics of 0.02% or less at 380nm, 12% or less at 390nm, 35% or more at 440nm, 41.5% or more at 550nm, and 41.5% or more at 610nm, after removing the protective film (thickness 53 μm). A laminate was obtained using the same procedure as in Example 1. The length of cracks occurring at the peripheral edges of the obtained laminate was measured by observing the edges with an optical microscope.

[0139] [Comparative Example 3] The TAC film of the protective film-coated linear polarizing plate (1) and the λ / 4 plate of the film-like phase difference layer have a storage modulus of 2.5 × 10 at 25°C. 4 A laminate was obtained using the same procedure as in Comparative Example 1, except that it was bonded with an adhesive layer (17 μm thick) made of Pa adhesive. The length of cracks occurring at the peripheral edges of the obtained laminate was measured by observing the peripheral edges of the laminate with an optical microscope.

[0140] [Table 1] [Explanation of Symbols]

[0141] 1,2,3 Laminate, 50 Support part, 51 Substrate, 52 Frame, 53 Rotary table, 54 Cylinder, 55 Jig, 60 Rotary tool, 100 Cured resin layer, 110 Film-like linear polarizer, 111 Polarizer protective layer, 112 Adhesive layer, 113 Linear polarizer layer, 120 Adhesive layer, 130 Film-like phase difference layer, 131 First liquid crystal curing layer, 132 First adhesive layer 132, 133 Second liquid crystal curing layer, 134 Second adhesive layer, 135 Third liquid crystal curing layer, 140 Protective film 140, 150 Laminating layer, R Rotating axis, W Laminate

Claims

1. The device comprises a cured resin layer, a film-like linear polarizing plate, an adhesive layer, and a film-like phase difference layer in this order. The aforementioned cured resin layer is a hard coat layer. The hard coat layer is a cured product of a hard coat layer forming composition containing an active energy ray curable resin. The aforementioned active energy ray curable resin includes an acrylic resin, The aforementioned film-like linear polarizing plate has a linear polarizing layer and thermoplastic resin films on both sides of the linear polarizing layer. The linearly polarized layer is a stretched film or stretched layer on which a dichroic dye is adsorbed. The aforementioned film-like phase difference layer includes two or more liquid crystal curing layers. The Martens hardness of the cured resin layer at a temperature of 23°C is HM (N / mm²). ２ When this is the case, then the following equation (1): HM≧2.4×10 ２ (N / mm ２ ) (1) Satisfying the conditions, The adhesive layer, when its storage modulus at a temperature of 25°C is E (Pa) and its thickness is T (μm), is given by the following formula (2): 1.0×10 ７ (Pa / μm)≧E / T≧8.0×10 ３ (Pa / μm) (2) A laminate that satisfies the requirements.

2. The storage modulus E(Pa) at the aforementioned temperature of 25°C is 3.0 × 10⁻⁶ ４ The laminate according to claim 1.

3. The laminate according to claim 1 or 2, wherein the thickness T (μm) is 30 μm or less.

4. The laminate according to any one of claims 1 to 3, wherein the laminate is in the form of a single leaf.

5. The laminate according to any one of claims 1 to 4, wherein the laminate has polished end faces.

6. A laminate for a flexible image display device comprising a laminate according to any one of claims 1 to 5, a front panel, and a touch sensor.

7. An image display device having a laminate according to any one of claims 1 to 5.

8. A flexible image display device having a laminate for a flexible image display device as described in claim 6.

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