KR20200106451A - Optical laminate and method of preparation therof - Google Patents

Abstract

The present invention is to provide an optical laminate having excellent flexibility even when cut with laser light and a manufacturing method thereof. The optical laminate of the present invention has a front plate and a polarizer layer. The optical laminate includes a deformed portion including at least a part of an outer peripheral end portion, and a top portion which is a region other than the deformed portion in planar view, and satisfies the formula T_N/W_HAZ >= 4.0.

Description

Optical laminate and its manufacturing method {OPTICAL LAMINATE AND METHOD OF PREPARATION THEROF}

The present invention relates to an optical laminate and a method of manufacturing the same.

Patent Document 1 proposes a polarizing plate in which a thick portion is formed along at least the opposite short side. Further, Patent Document 2 discloses a shock-absorbing pressure-sensitive adhesive sheet having a shock-absorbing pressure-sensitive adhesive layer, and a shock-absorbing pressure-sensitive adhesive sheet having a tapered side surface of the shock-absorbing pressure-sensitive adhesive layer is disclosed.

Patent Document 1: Japanese Patent Laid-Open No. 2012-173588 Patent Document 2: Japanese Patent Laid-Open No. 2015-166459

When the optical laminated body is cut from the optical laminated film using laser light or the like, the flexibility may decrease.

An object of the present invention is to provide an optical laminate having excellent flexibility even when cut from an optical laminate film by laser light or the like, and a method for producing the same.

The present invention provides a laminate shown below and a method for producing the same.

[1] 　 An optical laminate comprising a front plate and a polarizer layer, having a deformed portion including at least a part of an outer peripheral end portion in plan view, and a top portion that is a region other than the deformed portion, and the following formula (1) An optical laminate that satisfies.

T _N /W _HAZ ≥4.0 (1)

W _HAZ ： Width of deformation part [μm]

T _N : Thickness of the top part [μm]

[2] 　 The optical laminated body according to [1] further satisfying the following formula (2).

1≤M _N /M _HAZ ＜1.15 (2)

M _HAZ ：Compressive modulus of deformed part [MPa]

M _N : Compressive modulus of the upper part [MPa]

[3] 　 An optical laminate comprising a front plate and a polarizer layer, having a deformed portion including at least a part of an outer peripheral end in plan view, and a top portion that is a region other than the deformed portion, and satisfies the following equation (2). Laminate.

1≤M _N /M _HAZ ＜1.15 (2)

M _HAZ ：Compressive modulus of deformed part [MPa]

M _N : Compressive modulus of the upper part [MPa]

[4] An image display device comprising the optical laminate according to any one of [1] to [3].

[5] As the manufacturing method of the optical laminated body according to any one of [1] to [3],

A manufacturing method comprising a cutting step of cutting an optical laminated film with laser light irradiated from a laser cutter to obtain an optical laminate.

[6] 　 The production method according to [5], wherein the energy per unit length in the case of irradiating the laser light once is 150 mJ/mm or less.

According to the present invention, it is an object of the present invention to provide an optical laminate having excellent flexibility and a manufacturing method thereof even when cut from an optical laminate film by laser light or the like.

1 is a schematic cross-sectional view showing an example of an optical laminate according to the present invention.
2 is a schematic cross-sectional view showing another example of the optical laminate according to the present invention.
3 is a schematic cross-sectional view showing still another example of the optical laminate according to the present invention.
Fig. 4 is a cross-sectional observation image of an optical laminate by a scanning electron microscope.
5 is a schematic cross-sectional view showing an outer peripheral end of another example of the optical laminate according to the present invention.
6 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 1. FIG.
7 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 1. FIG.
8 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 1. FIG.
9 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 1. FIG.
10 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 1. FIG.
11 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 1. FIG.
12 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 6. FIG.
13 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 6. FIG.
14 is a schematic cross-sectional view illustrating a method of manufacturing an optical laminate in Example 6. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the drawings below, the scale is appropriately adjusted to make each component easier to understand, and the scale of each component shown in the drawings does not necessarily coincide with the actual scale of the component.

<Optical laminate>

1 is a schematic cross-sectional view of an optical laminate according to an embodiment of the present invention. The optical laminated body shown in FIG. 1 (hereinafter, also referred to as a "laminated body" for abbreviation) (1) is a bendable laminate comprising the front plate 10 and the polarizer layer 20. When the laminated body 1 is bent in the direction of the absorption axis and the transmission axis of the polarizer layer, the bendable means that the layered product 1 can be bent without cracking and breaking. The bendable means that the bending radius of the inner surface of the laminate is preferably capable of bending to 2.5 mm, and more preferably, cracks do not occur even if the number of bending of the inner surface of the laminate to bend radius of 2.5 mm is 10,000 times. Means that.

The absorption axis direction refers to a case in which the polymerizable liquid crystal compound is cured in a state in which the later-described dichroic dye and polymerizable liquid crystal compound constituting the polarizer layer 20 are horizontally aligned with respect to the substrate surface, or the dichroic dye exhibiting liquid crystal property is When horizontally aligned with respect to the substrate surface, it refers to the orientation direction of the dichroic dye and the polymerizable liquid crystal compound. The transmission axis direction refers to a case in which the polymerizable liquid crystal compound is cured while the later-described dichroic dye and the polymerizable liquid crystal compound constituting the polarizer layer 20 are horizontally aligned with respect to the substrate surface, or the dichroic dye exhibiting liquid crystal property is In the case of horizontal orientation with respect to the substrate surface, it is a horizontal direction with respect to the substrate surface and refers to a direction perpendicular to the orientation direction. The orientation state of the polarizer layer 20 can be confirmed by observation with a polarizing microscope. When the laminate (1) is installed in a polarizing microscope and the polarizing plate of the polarizing microscope is rotated, light leakage occurs and is observed in the brightest bright field, and the orientation direction of the polarizing plate of the polarizing microscope is the polarizer of the laminate (1). It becomes the direction of the absorption axis of the layer 20. When light leakage does not occur and is observed in the darkest dark field, the orientation direction of the polarizing plate of the polarizing microscope becomes the direction of the transmission axis of the polarizer layer 20 of the laminate 1.

The optical laminated body 1 may contain layers other than the layer mentioned above. The other layer may be disposed, for example, between the front plate 10 and the polarizer layer 20 or outside the polarizer layer 20 (a side opposite to the front plate side). As another layer, for example, a first adhesive layer disposed between the front plate 10 and the polarizer layer 20, or on the side opposite to the front plate 10 side of the polarizer layer 20 2 If the supporting substrate or the touch sensor panel disposed through the adhesive layer, or the touch sensor panel disposed through the second adhesive layer, a third adhesive layer is placed on the side opposite to the second adhesive layer side of the touch sensor panel. And a support base material disposed interposed therebetween.

The optical laminated body 1 may include a thermoplastic resin film layer disposed between the first adhesive layer and the polarizer layer 20. For example, the optical laminate 1 is laminated on the surface of the polarizer layer 20 on the side of the front plate 10 and/or on the side of the supporting substrate or the touch sensor panel, for example, through an adhesive layer. It may contain a thermoplastic resin film layer. Further, in the optical laminate, a base film to which the coating solution is applied may be included together with the layer when forming a layer by application of a coating solution.

The thickness of the optical laminate 1 is not particularly limited because it varies depending on the function required for the optical laminate 1 and the use of the optical laminate 1, but may be, for example, 50 μm or more and 1000 μm or less, preferably Is 100 μm or more and 500 μm or less, and more preferably 100 μm or more and 300 μm or less.

The planar shape of the optical 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 rectangular shape. When the planar shape of the optical 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 50 mm or more and 600 mm or less. The length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less.

When the plan view shape of the optical laminate 1 is a square shape, the lengths of each side in each layer constituting the optical laminate 1 may be the same. Each of the layers constituting the optical laminate 1 may have a corner portion R-processed, an end portion notched, or perforated.

In this specification, planar view means viewing from the thickness direction of the layer.

As described above, when the optical laminate 1 is repeatedly bent so that the inner surface of the optical laminate 1 has a bending radius of 2.5 mm with respect to at least one direction in its surface, preferably, Even if the number of bending is 10,000 times, no cracks occur.

When the optical laminate 1 is repeatedly bent so that the inner surface of the optical laminate 1 has a bending radius of 2.5 mm with respect to at least one direction within its surface, more preferably, the number of bending is Even if it is 30,000 times, no cracks are generated, more preferably, even if the number of bendings is 50,000, no cracks are generated, and even more preferably, even if the number of bends is 100,000 times, no cracks are generated.

In the optical laminated body 1, it is preferable that the number of bending times that does not cause cracks at least in one direction in the plane and a direction orthogonal thereto is within the above range when the repeated bending is performed.

In the present specification, the bend includes a folded form in which a curved surface is formed in a bent portion. In the folded form, the bending radius of the folded inner surface is not particularly limited. Further, the curvature includes a form of refraction in which the refractive angle of the inner surface is greater than 0 degrees and less than 180 degrees, and the form of a refraction in which the curvature radius of the inner surface is approximated to zero, or the refractive angle of the inner surface is 0 degrees.

An image display device to which the optical laminate 1 having good flexibility is applied can be used as a flexible display capable of being bent.

2 is a schematic cross-sectional view showing an example of an optical laminate according to the present invention. The optical laminate 2 shown in FIG. 2 is provided with a front plate 10, a first adhesive layer 30, a polarizer layer 20, a second adhesive layer 40, and a support substrate 50 in this order. do.

3 is a schematic cross-sectional view showing another example of the optical laminate according to the present invention. The optical laminate 3 shown in FIG. 3 is a front plate 10, a first adhesive layer 30, a polarizer layer 20, a second adhesive layer 40, a touch sensor panel 60, and a third adhesive. The layer 70 and the supporting substrate 50 are provided in this order.

The optical laminated body has a deformed portion including at least a part of an outer peripheral end portion in plan view, and a top portion which is a region other than the deformed portion, and satisfies the following equation (1).

T _N /W _HAZ ≥4.0 (1)

W _HAZ ： Width of deformed part in flat surface [μm]

T _N : Thickness of the top at the cross section [μm]

The optical laminated body becomes excellent in flexibility by satisfying the formula (1).

The optical laminated body can be obtained by cutting the optical laminated film in a long or sheet shape into a predetermined size or shape. When the obtained optical laminate has a cut surface formed by laser light or the like, for example, when it is bent, cracks or the like are likely to occur in the outer peripheral end region having the cut surface, and sufficient flexibility may not be obtained. The cross section of the outer circumferential end region where cracks occurred was observed with a scanning electron microscope. As shown in Fig. 4A, it can be seen that deformation occurs in the thickness direction by heat and expands in the thickness direction on both sides. there was. As shown in FIG. 4B, when the region where the thickness is increased is the deformed portion and the region where the thickness does not change is the top portion, the thickness of the undeformed portion (T _N ) with respect to the width (W _HAZ ) 101 of the deformed portion When (102) was more than a predetermined value, it found that the optical laminated body was excellent in flexibility. In addition, the boundary 103 between the deformed portion 101 and the top portion 102 is a point farthest from the outer circumferential end of the points where the thickness change observed on both sides or one side of the optical laminate by a scanning electron microscope starts. It is taken as a straight line parallel to the thickness direction including. In addition, when a plurality of boundaries are observed, a region located outside the boundary farthest from the outer circumferential end (on the outer circumferential end side) is used as the deformation portion. Further, in the present invention, the region other than the deformed portion is used as the top portion, and the thickness is set as the thickness T _N of the top portion. The boundary 103 between the deformed portion 101 and the top portion 102 can also be observed by a difference in contrast when the transmitted light of the outer peripheral end region including the cut surface is observed with an optical microscope.

The deformation portion is usually formed on the outer periphery of the optical laminate with a constant width along the cut surface in many cases. When the deformation portion is not a constant width according to the cut surface, the width of the deformation portion may be the longest width of the deformation portion. As for the optical laminated body, it is sufficient if at least a part of the outer circumferential end is cut from the optical laminated film, that is, the deformed part may include at least a part of the outer circumferential end. In addition, in the optical laminated body, all of the outer circumferential ends may be cut from the optical laminated film, that is, the deformation portion may include all of the outer circumferential ends.

5 is a schematic cross-sectional view showing an outer peripheral end of the optical laminate 2 of the configuration of FIG. 2. The cut surface 201 is a cut surface cut by laser light, and is inclined from the irradiation side to the exit side in the laser irradiation direction 202. The angle of this inclination can change, for example, depending on the laser light output, cutting speed, irradiation angle, irradiation direction, and the like. In Fig. 5, the boundary between the deformed portion and the top portion can be the position of the water line 203 lowered from the portion where the deformity has occurred on the surface on the laser light irradiation side to the surface on the laser light output side. The width W _HAZ of the deformation|transformation part becomes the distance 204 from the intersection of this water line 203 and the laser light-emitting side surface of an optical laminated body to the end of the laser light-emitting side surface of an optical laminated body.

In plan view, the width W _HAZ of the deformed part means the width of the line in the direction perpendicular to the cut surface when the deformed part is formed in a line shape along the cut surface. For example, in plan view, when the deformed portion is formed in a straight line along the cut surface, it is the distance from the cut surface to the top in the vertical direction. The length of the cut surface in the direction along the outer periphery may be, for example, 1 mm or more, and is usually less than or equal to the length of the outer periphery of the optical laminate.

The width W _HAZ of the deformation part may be, for example, 1 μm or more and 65 μm or less, preferably 5 μm or more and 50 μm or less, more preferably 10 μm or more and 40 μm or less, and more preferably 15 μm or more and 35 μm or less. The width W _HAZ of the deformation portion can be measured according to the method described in the column of Examples to be described later.

The width W _HAZ of the deformation portion can be set within the above range by adjusting the cutting conditions. For example, when cutting the optical laminated film by laser light, the width W _HAZ of the deformed portion tends to decrease in the width of the deformed portion when the output of the laser light is decreased.

The thickness T _N 205 of the top portion shown in FIG. 5 may be the thickness of the above-described optical laminate, for example, 50 μm or more and 1000 μm or less, preferably 100 μm or more and 500 μm or less, and more preferably 100 μm or more and 300 μm or less. to be.

The thickness T _HAZ of the deformed portion may be, for example, 0.1 μm or more and 1000 μm or less than the thickness T _{N of the} top portion from the viewpoint of deflection and flexibility of the thickness of the member. The thickness T _HAZ of the deformed portion is the maximum thickness in the case of including a portion having increased thickness on one side and the other side of the cross section of the deformed portion of the optical laminate observed by a scanning electron microscope.

T _N /W _HAZ is preferably 6 or more, more preferably 8 or more, and still more preferably 10 or more. The upper limit value is not particularly limited, but T _N /W _HAZ may be 100 or less, 50 or less, and 30 or less.

From another viewpoint, the optical laminated body satisfies the following formula (2).

1≤M _N /M _HAZ ＜1.15 (2)

M _HAZ ：Compressive modulus of deformed part [MPa]

M _N : Compressive modulus of the upper part [MPa]

The optical laminated body is excellent in flexibility by satisfying the formula (2). The optical laminated body satisfies the formulas (1) and (2), and there is a tendency that more excellent flexibility is obtained.

The inventors have found that the compressive elastic modulus of the deformed portion is sometimes changed. In this case, the compressive elastic modulus tends to be small. It has been found that when the change in the compressive modulus of the deformed portion is not too large, excellent flexibility tends to be obtained.

In order to satisfy the above equation (2), the cutting conditions can be adjusted. For example, when cutting the optical laminated film by laser light, the compressive elastic modulus of the deformed portion tends to be easily suppressed when the output of the laser light is decreased.

The compressive elastic modulus M _N of the top may be, for example, 1000 MPa or more and 4000 MPa or less, and preferably 1500 MPa or more and 3500 MPa or less. The compressive elastic modulus is measured at the top and deformation portions on the surface of the front plate, respectively. The compressive modulus is measured by the method described in the column of Examples to be described later.

M _N /M _HAZ is preferably 1 or more and 1.10 or less, more preferably 1 or more and 1.08 or less, still more preferably 1 or more and 1.05 or less, and particularly preferably 1 or more and 1.03 or less. M _N /M _HAZ may exceed 1.

[Front panel]

The front plate 10 is preferably a plate-like body capable of transmitting light. The front plate 10 may be composed of only one layer, or may be composed of two or more layers. The front plate 10 may be a layer constituting the outermost surface of the image display device.

As the front plate 10, for example, a plate-like body made of glass (for example, a glass plate, a glass film, etc.), a plate-like body made of resin (for example, a resin plate, a resin sheet, a resin film, etc.) are mentioned. I can.

Among the above, from the viewpoint of the flexibility of the optical layered product and the image display device including the same, a resin plate-like body such as a resin film is preferable.

As a thermoplastic resin constituting a resin plate-like body such as a resin film, for example, a chain polyolefin resin (polyethylene resin, polypropylene resin, polymethylpentene resin, etc.), a cyclic polyolefin resin (Norbor Polyolefin resins such as ene resins); Cellulose resins such as triacetyl cellulose; Polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; Polycarbonate resin; Ethylene-vinyl acetate resin; Polystyrene resin; Polyamide resin; Polyetherimide resin; (Meth)acrylic resins such as polymethyl (meth)acrylate resins; Polyimide resin; Polyether sulfone resin; Polysulfone resin; Polyvinyl chloride resin; Polyvinylidene chloride resin; Polyvinyl alcohol resin; Polyvinyl acetal resin; Polyether ketone resin; Polyether ether ketone resin; Polyether sulfone resin; And polyamide-imide-based resins.

Thermoplastic resins can be used alone or in combination of two or more.

Among them, polyimide resins, polyamide resins, and polyamideimide resins are suitably used as the thermoplastic resin constituting the front plate 10 from the viewpoints of flexibility, strength and transparency.

The front plate 10 may be a film in which hardness is further improved by providing a hard coat layer on at least one surface of the base film. As the base film, the resin film described above can be used.

The hard coat layer may be formed on one surface of the base film or may be formed on both surfaces. By providing a hard coat layer, hardness and scratch resistance can be improved.

The hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard coat layer may contain an additive in order to improve strength. The additive is not limited, and inorganic fine particles, organic fine particles, or mixtures thereof are exemplified.

The front plate 10 may not only have a function (function as a window film) to protect the front surface (screen) of the image display device, but may also have a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, and the like.

The thickness of the front plate 10 may be, for example, 20 μm or more and 2000 μm or less, preferably 25 μm or more and 1500 μm or less, more preferably 30 μm or more and 1000 μm or less, more preferably 40 μm or more and 500 μm or less, particularly preferably 40 μm It may be not less than 200 μm, and still more preferably not less than 40 μm and not more than 100 μm.

[First adhesive layer]

The first adhesive layer 30 is an adhesive layer disposed between the front plate 10 and the polarizer layer 20.

The optical laminate may include one or two or more adhesive layers as the first adhesive layer 30, but is preferably one.

The first adhesive layer 30 can be composed of a pressure-sensitive adhesive composition containing as a main component a resin such as (meth)acrylic, rubber, urethane, ester, silicone, and polyvinyl ether. Among them, a pressure-sensitive adhesive composition comprising a (meth)acrylic resin excellent in transparency, weather resistance, heat resistance and the like as a base polymer is suitable. The pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.

Examples of the (meth)acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, hexyl (meth)acrylate, octyl (meth)acrylate, One or two or more of (meth)acrylic acid esters such as lauryl (meth)acrylate, isooctyl (meth)acrylate, isodecyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isobornyl (meth)acrylate A polymer or copolymer having as a monomer is suitably used.

It is preferable to copolymerize a polar monomer to the base polymer. As a polar monomer, for example, (meth)acrylic acid, (meth)acrylic acid 2-hydroxypropyl, (meth)acrylate hydroxyethyl, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate And monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, such as glycidyl (meth)acrylate.

The pressure-sensitive adhesive composition may contain only the base polymer, but usually further contains a crosslinking agent. Examples of the crosslinking agent include divalent or higher metal ions, which form a carboxylic acid metal salt between a carboxyl group; As a polyamine compound, forming an amide bond between a carboxyl group; A polyepoxy compound or a polyol that forms an ester bond between a carboxyl group; As a polyisocyanate compound, what forms an amide bond between a carboxyl group is illustrated. Among them, polyisocyanate compounds are preferable.

The active energy ray-curable pressure-sensitive adhesive composition has a property of curing by irradiation with active energy rays such as ultraviolet rays or electron beams, so it has adhesiveness even before active energy ray irradiation and can adhere to adherends such as films, and is cured by irradiation with active energy rays. It is a pressure-sensitive adhesive composition having a property that can adjust the adhesive force and the like.

It is preferable that the active energy ray-curable pressure-sensitive adhesive composition is an ultraviolet-curable type. The active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, if necessary, a photopolymerization initiator, a photosensitizer, or the like may be contained.

Examples of the active energy ray polymerizable compound include (meth)acrylate monomers having at least one (meth)acryloyloxy group in the molecule; (Meth)acrylic compounds such as (meth)acryloyloxy group-containing compounds such as (meth)acrylate oligomers obtained by reacting two or more functional group-containing compounds and having at least two (meth)acryloyloxy groups in the molecule Can be mentioned.

The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, tackifiers, fillers (metal powders or other inorganic powders, etc.), antioxidants, Additives such as ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, and photopolymerization initiators may be included.

The first adhesive layer 30 can be formed by applying, for example, a diluent of an organic solvent of the adhesive composition to a substrate and drying it. When an active energy ray-curable pressure-sensitive adhesive composition is used, a cured product having a desired degree of curing can be obtained by irradiating the formed pressure-sensitive adhesive layer with active energy rays.

The thickness of the first adhesive layer 30 is, for example, 2 μm or more and 100 μm or less, preferably 3 μm or more and 50 μm or less, and more preferably 5 μm or more and 30 μm or less.

[Polarization layer]

Examples of the polarizer layer 20 include a stretched film or stretched layer in which a dichroic dye is adsorbed, a layer formed by coating and curing a composition containing a dichroic dye and a polymerizable compound, and the like.

Specifically, as a dichroic dye, iodine or a dichroic organic dye is used. Dichroic organic dyes include dichroic direct dyes comprising a disazo compound such as C.I.DIRECT®RED®39, and dichroic direct dyes comprising a compound such as tris azo or tetrakis azo.

As a polarizer layer formed by coating and curing a composition containing a dichroic dye and a polymerizable compound, a composition containing a dichroic dye having liquid crystal properties or a composition containing a dichroic dye and a polymerizable liquid crystal is applied and cured. A polarizer layer including a cured product of a polymerizable liquid crystal compound such as a layer to be obtained is mentioned.

A polarizer layer formed by coating and curing a composition containing a dichroic dye and a polymerizable compound is preferable because there is no limitation in the direction of bending as compared to a stretched film or a stretched layer in which a dichroic dye is adsorbed. Therefore, for at least one direction in a plane and a direction orthogonal thereto, and for all directions in the plane, the number of bends that do not cause cracks in the case of repeated bending is the above range. For example, it is preferable to apply a composition containing a dichroic dye and a polymerizable compound as the polarizer layer 20 and cure to use the layer.

(1) Stretched film or polarizer layer which is a stretched layer

The polarizer layer 20, which is a stretched film to which a dichroic dye is adsorbed, is a step of uniaxially stretching a polyvinyl alcohol-based resin film, and the dichroic dye is adsorbed by dyeing a polyvinyl alcohol-based resin film with a dichroic dye. It can be manufactured through a process of making, a process of treating a polyvinyl alcohol-based resin film with a dichroic dye adsorbed therein with an aqueous boric acid solution, and a process of washing with water after treatment with an aqueous boric acid solution.

The thickness of the polarizer layer 20 is 2 μm or more and 40 μm or less, for example. The thickness of the polarizer layer may be 5 μm or more, 20 μm or less, further 15 μm or less, and even more preferably 10 μm or less.

Polyvinyl alcohol-based resin is obtained by saponifying a polyvinyl acetate-based resin. As the polyvinyl acetate resin, a copolymer of vinyl acetate and other monomers copolymerizable therewith other than polyvinyl acetate, which is a homopolymer of vinyl acetate, is used. Other monomers copolymerizable with vinyl acetate include, for example, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamides having an ammonium group.

The degree of saponification of the polyvinyl alcohol-based resin is usually about 85 to 100 mol%, and preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and 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 or more and 10000 or less, and preferably 1500 or more and 5000 or less.

The polarizer layer 20, which is a stretched layer to which a dichroic dye is adsorbed, is usually a step of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, a step of uniaxially stretching the obtained laminated film, and uniaxially stretched. The process of making the polarizer layer 20 by adsorbing the dichroic dye by dyeing the polyvinyl alcohol-based resin layer of the laminated film with a dichroic dye, a process of treating the film adsorbed with the dichroic dye with an aqueous boric acid solution, and boric acid It can be manufactured through a process of washing with water after treatment with an aqueous solution.

If necessary, the base film may be peeled off from the polarizer layer 20. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described later.

The polarizer layer 20 which is a stretched film or a stretched layer may be included in the optical laminate in a form in which a thermoplastic resin film is pasted on one or both sides thereof. This thermoplastic resin film can function as a protective film for the polarizer layer 20 or a retardation film.

The thermoplastic resin film may include, for example, polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); Cellulose resins such as triacetyl cellulose; Polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; Polycarbonate resin; (Meth)acrylic resin; Or it may be a film made of a mixture of these.

The thickness of the thermoplastic resin film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, still more preferably 80 μm or less, even more preferably 60 μm or less from the viewpoint of thinning, and It is usually 5 μm or more, and preferably 20 μm or more.

The thermoplastic resin film may or may not have a retardation.

The thermoplastic resin film can be bonded to the polarizer layer 20 using an adhesive layer, for example.

(2) A polarizer layer formed by coating and curing a composition containing a dichroic dye and a polymerizable compound

As a polarizer layer formed by applying and curing a composition containing a dichroic dye and a polymerizable compound, a composition containing a polymerizable dichroic dye having liquid crystal properties or a composition containing a dichroic dye and a polymerizable liquid crystal, A polarizer layer including a cured product of a polymerizable liquid crystal compound such as a layer obtained by coating and curing a base film (or an alignment film formed on a base film) is mentioned.

If necessary, the base film or both of the base film and the alignment film may be peeled off from the polarizer layer 20. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described above.

The polarizer layer 20 formed by coating and curing a composition containing a dichroic dye and a polymerizable compound may be included in the optical laminate in a form in which a thermoplastic resin film is adhered to one or both surfaces thereof. As a thermoplastic resin film, the thing similar to the thermoplastic resin film which can be used for a stretched film or a polarizer layer which is a stretched layer can be used. The polarizer layer may have an alignment film. The alignment film may be peeled off. The thermoplastic resin film can be bonded to the polarizer layer 20 using an adhesive layer, for example.

Specific examples of the polarizer layer 20 formed by coating and curing a composition containing a dichroic dye and a polymerizable compound include those described in Japanese Patent Laid-Open No. 2013-37353 or Japanese Patent Laid-Open No. 2013-33249. I can.

The polarizer layer formed by coating and curing a composition containing a dichroic dye and a polymerizable compound may have an overcoat (OC) layer formed on one or both surfaces thereof as a protective layer. Photocurable resins and water-soluble polymers. Examples of the photocurable resin include (meth)acrylic resins, urethane resins, (meth)acrylic urethane resins, epoxy resins, and silicone resins. Examples of the water-soluble polymer include poly(meth)acrylamide-based polymers; Polyvinyl alcohol and vinyl alcohol-based polymers such as ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, (meth)acrylic acid or anhydride-vinyl alcohol copolymer thereof; Carboxy vinyl polymer; Polyvinyl pyrrolidone; Starch classification; Sodium alginate; Polyethylene oxide-based polymers, and the like. The thickness of the OC layer is preferably 20 μm or less, more preferably 15 μm or less, further preferably 10 μm or less, 5 μm or less, and 0.05 μm or more, and 0.5 μm or more.

The thickness of the polarizer layer 20 formed by coating and curing a composition containing a dichroic dye and a polymerizable compound is usually 10 μm or less, preferably 0.5 μm or more and 8 μm or less, and more preferably 1 μm or more and 5 μm or less. .

A retardation film (eg, a retardation film including a λ/4 plate as a retardation layer) described later is laminated on a polarizing plate to obtain a circularly polarizing plate. In this case, the angle formed between the absorption axis of the polarizer and the slow axis of the λ/4 plate may be 45°±10°.

[Second adhesive layer]

The second adhesive layer 40 is an adhesive layer disposed between the polarizer layer 20 and the touch sensor panel 60.

However, it is not limited to this embodiment, and the optical laminated body may not include the second adhesive layer 40, and may include one or two or more adhesive layers as the second adhesive layer 40. The number of the second adhesive layer 40 is preferably 1 or more, more preferably 1 or more and 3 or less, and still more preferably 1 or 2.

The composition and blending components of the pressure-sensitive adhesive composition constituting the second adhesive layer 40, the type of the pressure-sensitive adhesive composition (whether active energy ray-curable or heat-curable, etc.), additives that can be blended into the second adhesive layer 40, agents As for the manufacturing method of the second adhesive layer 40 and the thickness of the second adhesive layer 40, the description of the first adhesive layer 30 is cited.

One or two or more adhesive layers corresponding to the second adhesive layer 40 may each independently be the same as or different from the first adhesive layer 30 in thickness or the like.

[Supporting description]

The supporting substrate 50 is preferably a plate-like body capable of transmitting light. The supporting substrate 50 may be composed of only one layer, or may be composed of two or more layers. The supporting substrate 50 may be a display device such as a retardation film, a touch sensor panel, an organic EL display device, or a combination thereof.

As the supporting base material 50, similarly to the front plate 10, for example, a plate-like body made of glass (for example, a glass plate, a glass film, etc.), a plate-like body made of resin (for example, a resin plate, a resin sheet, etc.) , Resin films, etc.) are mentioned.

Among the above, from the viewpoint of the flexibility of the optical layered product and the image display device including the same, a resin plate-like body such as a resin film is preferable. For a specific example of a thermoplastic resin constituting a resin plate-like body such as a resin film, the description of the front plate 10 is cited. The thermoplastic resin is preferably a cellulose resin, a (meth)acrylic resin, a cyclic polyolefin resin, a polyester resin, a polycarbonate resin, or the like.

The thickness of the supporting substrate 50 is preferably 15 μm or more and 200 μm or less, more preferably 20 μm or more and 150 μm or less, and still more preferably 50 μm or more and 130 μm or less from the viewpoint of thinning the optical laminate.

(Phase difference film)

The retardation film may include one or two or more retardation layers. The retardation layer may be a positive A plate such as a λ/4 plate or a λ/2 plate, and a positive C plate. The retardation layer may be formed of a resin film exemplified as a material of the above-described protective film, or may be formed of a layer obtained by curing a polymerizable liquid crystal compound. The retardation film may further contain an alignment film or a base film.

The thickness of the retardation film may be, for example, 1 μm or more and 50 μm or less.

[Touch sensor panel]

If the touch sensor panel 60 is a sensor capable of detecting the touched position, the detection method is not limited, and the resistive film method, the capacitive coupling method, the optical sensor method, the ultrasonic method, the electromagnetic induction coupling method, the surface acoustic wave method Touch sensor panels such as, etc. are illustrated. In terms of low cost, a resistive film type and a capacitive coupling type touch sensor panel are suitably used.

An example of a resistive touch sensor panel is a pair of substrates arranged opposite to each other, an insulating spacer sandwiched between the pair of substrates, and a transparent conductive film provided as a resistive film on the entire inner surface of each substrate. And touch position detection circuit. In an image display device provided with a resistive touch sensor panel, when the surface of the front plate 10 is touched, the opposing resistive film is short-circuited, and a current flows through the resistive film. The touch position detection circuit detects a change in voltage at this time, and the touched position is detected.

An example of a capacitive coupling type touch sensor panel is constituted by a substrate, a position detecting transparent electrode provided on the front surface of the substrate, and a touch position detecting circuit. In an image display device in which a capacitive coupling type touch sensor panel is installed, when the surface of the front plate 10 is touched, the transparent electrode is grounded through the capacitance of the human body at the touched point. The touch position detection circuit detects the ground of the transparent electrode, and the touched position is detected.

The thickness of the touch sensor panel 60 may be, for example, 5 μm or more and 2,000 μm or less, preferably 5 μm or more and 100 μm or less, and more preferably 5 μm or more and 50 μm or less.

[Third adhesive layer]

The third adhesive layer 70 is an adhesive layer disposed between the touch sensor panel 60 and the supporting substrate 70.

However, it is not limited to this embodiment, and the optical laminated body may not include the third adhesive layer 70, and may include one or two or more adhesive layers as the third adhesive layer 70. The number of the third adhesive layer 70 is preferably 1 or more, more preferably 1 or more and 3 or less, and still more preferably 1 or 2.

The composition and blending components of the pressure-sensitive adhesive composition constituting the third adhesive layer 70, the type of the pressure-sensitive adhesive composition (whether active energy ray-curable or thermosetting type, etc.), additives that can be blended into the third adhesive layer 70, agents As for the manufacturing method of the three adhesive layer 70 and the thickness of the third adhesive layer 70, the description of the first adhesive layer 30 is cited.

One or two or more adhesive layers corresponding to the third adhesive layer 70 may each independently be the same as or different from the first adhesive layer 30 in thickness or the like.

<Manufacturing method of optical laminate>

The manufacturing method of an optical laminated body includes a cutting process of cutting an optical laminated film with laser light irradiated from a laser cutter to obtain an optical laminated body.

The optical laminated film can be produced according to a method including a step of bonding the layers constituting the optical laminate through an adhesive layer or an adhesive layer further. When bonding layers via an adhesive layer or an adhesive layer, in order to increase adhesion, it is preferable to perform surface activation treatment such as corona treatment on one or both of the bonding surfaces.

The polarizer layer or the retardation layer can be formed directly on a thermoplastic resin film or a base film or through an alignment film, and the thermoplastic resin film or base film may be included in an optical laminate, or from a polarizer layer or a retardation layer. It does not need to be peeled off and become a component of the optical laminate. The optical laminated film can be produced, for example, according to the method described in the column of Examples to be described later.

In the cutting process, an optical laminated body can be obtained by cutting the optical laminated film into a desired shape or dimension with a laser cutter. In addition, the manufacturing method uses a cutting method other than the cutting method using a laser cutter, for example, a Thomson blade before or after the cutting process of cutting the optical laminated film with a laser cutter to obtain an optical laminate, or during this process. It may also include a step of cutting and a drum cut step.

Examples of the type of laser light irradiated from the laser cutter include CO ₂ laser (wavelength 9.3 μm), fiber-laser (wavelength 1064 nm, YAG laser (wavelength 1064 nm), YVO laser (wavelength 1064 nm), and the like). Among them, from the viewpoint of making it easier for the optical laminate to satisfy Equation (1), a CO ₂ laser (wavelength 9.3 μm) is preferred. As a CO ₂ laser (wavelength 9.3 μm), for example, a light source manufactured by Synrad The laser light may be pulsed light or CW light.

The direction in which the laser light is irradiated may be the front plate side of the optical laminated film, or the opposite side may be used, but it is preferably the front plate side.

The laser light can be irradiated vertically downward to the upper surface of the optical laminated film provided horizontally, and can also be irradiated obliquely with respect to the scanning direction of the laser light. The laser light can be irradiated so as to focus on the lower surface of the optical laminated film disposed horizontally. For example, when the laser light is irradiated to the front plate side, it is possible to focus on the surface of the front plate. Thereby, it can be easily suppressed that the deformation|transformation part becomes too large.

The output of the laser light may be, for example, 1 W or more and 75 W or less, preferably 5 W or more and 65 W or less, more preferably 10 W or more and 55 W or less, and still more preferably 10 W or more and 30 W or less. . When the laser light output is low, the width W _HAZ of the above-described deformation portion tends to be small.

Cutting can be easily performed by irradiating the laser light multiple times. When irradiating the laser light multiple times, the number of times of irradiation of the laser light may be, for example, 2 or more and 5 or less, and preferably 2 or more and 3 or less.

The speed at which the laser light is scanned (cutting speed) may be, for example, 10 mm/sec or more and 1000 mm/sec or less, and preferably 200 mm/sec or more and 600 mm/sec or less.

When the laser light is irradiated once, the energy (irradiation amount) per unit length may be, for example, 150 mJ/mm or less, preferably 10 mJ/mm or more and 125 mJ/mm or less, and preferably 15 mJ/mm It is mm or more and 110 mJ/mm or less, More preferably, it is 20 mJ/mm or more and 100 mJ/mm or less.

A laser cutter may be used to perform R processing on each portion of the optical laminate or to provide a notch or hole at the end.

<Image display device>

An image display device according to the present invention includes the optical laminate according to the present invention. The image display device is not particularly limited, and examples thereof include image display devices such as an organic EL display device, an inorganic EL display device, a liquid crystal display device, and an electroluminescent display device. The image display device may have a touch panel function. The optical laminate is suitable for an image display device having flexibility, such as being capable of bending or folding.

In the image display apparatus, the optical laminate is disposed on the viewing side of the display element included in the image display apparatus with the front plate facing the outside (the side opposite to the display element side, that is, the viewing side).

The image display device according to the present invention can be used as mobile devices such as smartphones and tablets, televisions, digital photo frames, electronic signs, measuring devices and instruments, office devices, medical devices, computer devices, and the like.

The image display device according to the present invention is suitable for flexible displays and the like because of its excellent flexibility.

Example

Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to these examples. "%" and "parts" in the examples are mass% and mass parts unless otherwise specified. Test and measurement were performed as follows.

[Compression modulus]

About the deformed part and the top part of the obtained optical laminated body, the compressive modulus was measured under the following conditions. The tip was pushed into the surface of the front plate.

Evaluation device: Nano　Indenter

Evaluation temperature: Room temperature, 25℃

Pressure: 10mN

Type of Tip：Vickers　Tip

Repeat measurement: 10 times

[Layer thickness]

It measured using a contact-type film thickness measuring apparatus ("MS-5C" manufactured by Nikon Corporation). However, about the polarizer layer and the alignment film, it measured using a laser microscope ("OLS3000" manufactured by Olympus Corporation).

[Width of deformed part]

First, the boundary between the deformed portion and the top portion was determined by cross-sectional observation with a scanning electron microscope. From the point at which the thickness change observed on both sides or one side of the optical layered body starts with a scanning electron microscope, the point that is the most distant from the outer peripheral end is determined, and a straight line parallel to the thickness direction including the point is determined as a boundary. did. The distance from the boundary to the outer peripheral end was measured, and the distance was taken as the width of the deformation portion.

[Flexibility]

About the obtained optical laminated body, the flexibility was measured under the following conditions.

Evaluation device: Forehu, model name: F1-2SV

Evaluation temperature: Room temperature, 25℃

Bending method: In-folding (Bending with the front plate inward)

Flexion speed: 1Hz

Waiting time between bends: 0 seconds

The number of bending: Initially, bending was repeated until cracks were observed.

Bend radius: 2.5 mm (2.5 R)

[Example 1]

According to the following procedure, an optical laminate having the same configuration as in Fig. 2 was produced.

(1) Preparation of the front panel

A window film (polyimide film (total thickness: 70 μm)) having a hard coat layer on both surfaces of the front plate 10 was prepared. The hard coat layer was a layer cured by an acrylic resin, and the thickness was 10 μm. The thickness of the mid film was 50 μm.

(2) Preparation of adhesive sheet A

An acrylic resin was obtained by reacting the following components at 55°C while stirring in a nitrogen atmosphere.

Butyl acrylate: 70 parts

Methyl acrylate: 20 parts

Acrylic acid: 2.0 parts

Radical polymerization initiator (2, 2'-azobisisobutyronitrile): 0.2 parts

Solvent (ethyl acetate): 80 parts

To the obtained acrylic resin, 1.0 part of a crosslinking agent ("Coronate L" manufactured by TOSOH CORPORATION) and 0.5 part of a silane coupling agent ("X-12-981" manufactured by Shin-Etsu Chemical Co., Ltd.) were mixed, and the total solid content concentration was 10 Ethyl acetate was added so that it might become %, and the adhesive composition was obtained.

The obtained pressure-sensitive adhesive composition was applied to a release-treated surface of a release-treated polyethylene terephthalate film (release film B, thickness 38 µm) so that the thickness after drying was 25 µm using an applicator. The coating layer was dried at 100° C. for 1 minute to obtain a film including an adhesive layer. Then, on the exposed surface of the pressure-sensitive adhesive layer, another polyethylene terephthalate film (release film A, thickness 38 μm) subjected to a release treatment was bonded. Then, it was cured for 7 days under the conditions of a temperature of 23°C and a relative humidity of 50%RH.

In this way, an adhesive sheet A composed of a release film A/adhesive layer/release film B was produced.

(3) Preparation of laminated film A having a polarizer layer

(3-1) Preparation of polymerizable liquid crystal compound

The polymerizable liquid crystal compound represented by the following formula (1-6) (hereinafter, also referred to as "compound (1-6)") and the polymerizable liquid crystal compound represented by the following formula (1-7) (hereinafter, "compound (1- 7)".) was prepared according to the method described in Lub et al. Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996).

[Tue 1]

[Tue 2]

(3-2) Preparation of dichroic pigment

As a dichroic dye, an azo dye described in Examples of JP 2013-101328 A represented by the following formulas (2-1a), (2-1b) and (2-3a) was prepared.

[Tue 3]

[Tue 4]

[Tue 5]

(3-3) Preparation of the composition for forming a polarizer layer

75 parts of compound (1-6) and 25 parts of compound (1-7) which are polymerizable liquid crystal compounds, each of azo dyes represented by formulas (2-1a), (2-1b) and (2-3a) which are dichroic dyes 2.5 parts, 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl) butan-1-one as a polymerization initiator ("Irgacure369" manufactured by BASF Japan) 6 parts, and a polyacrylate compound as a leveling agent ( "BYK-361N" made by BYK-Chemie) 1.2 parts was mixed with 400 parts of toluene of a solvent, and the obtained mixture was stirred at 80 degreeC for 1 hour, and the composition for polarizer layer formation was prepared.

(3-4) Preparation of the composition for forming an alignment film

A polymer having a photoreactive group consisting of the following structural units was dissolved in cyclopentanone so that the concentration was 5% to prepare a composition for forming an alignment film.

[Tue 6]

(3-5) Preparation of laminated film A having a polarizer layer

On a triacetyl cellulose (TAC) film (thickness 25 μm), the composition for forming an alignment film obtained in (3-4) was applied according to a bar coating method, and heated and dried in a drying oven at 80° C. for 1 minute.

The obtained dry coating film was subjected to polarized UV irradiation treatment to form a first alignment film (AL1). In the polarized UV treatment, light irradiated from a UV irradiation device ("SPOT　CURESP-7" manufactured by USHIO INC.) is transmitted through a wire-grid ("UIS-27132##" manufactured by USHIO INC.), and a wavelength of 365 nm It was carried out under the conditions of 100 mJ/cm<2> of accumulated light quantity measured in. The thickness of the first alignment layer AL1 was 100 nm.

On the formed first alignment film (AL1), the composition for forming a polarizer layer obtained in the above (3-3) was applied according to a bar coating method, heated and dried in a drying oven at 120° C. for 1 minute, and then cooled to room temperature. Using the UV irradiation apparatus, a polarizer layer pol was formed by irradiating the dried coating film with ultraviolet rays at a cumulative amount of light of 1200 mJ/cm 2 (365 nm standard). The thickness of the obtained polarizer layer was 1.8 μm.

In this way, a laminated film A composed of a polarizer layer/first alignment film (AL1)/thermoplastic resin film layer (TAC film) was obtained.

(4) Preparation of the touch sensor panel

A touch sensor pattern layer was prepared as a touch sensor panel. The touch sensor pattern layer had an ITO layer as a transparent conductive layer and a cured layer of an acrylic resin composition as a separation layer, and had a thickness of 7 μm.

(5) Preparation of supporting substrate

A polyimide film having a thickness of 113 μm and an organic EL element was prepared.

(6) Preparation of optical laminate

This will be described with reference to FIGS. 6 to 10. In addition, an alignment layer is allocated to FIGS. 6 to 10.

In addition, in the bonding of all layers shown below, corona treatment (output 0.3 kW, speed 3 m/min, once) was performed on each of the bonding surfaces of the two layers to be bonded, and then bonding was performed (other examples. And the same is true for the comparative example.).

First, the release film A of the pressure-sensitive adhesive sheet A obtained in the above (2) was peeled off, the exposed pressure-sensitive adhesive layer was bonded to the surface of the polarizer layer of the laminated film A obtained in (3), and the laminated film shown in FIG. Got it. In Fig. 6, reference numeral 20 denotes a polarizer layer of laminated film A, reference numeral 90 denotes a thermoplastic resin film layer of laminated film A, reference numeral 40 denotes an adhesive layer of adhesive sheet A, which It corresponds to the two adhesive layer 40, and reference numeral 41 denotes the release film B of the adhesive sheet A.

Next, the release film (B41) was peeled from the laminated film shown in FIG. 6, and the touch sensor panel (touch sensor panel 60) of (4) was attached to the surface of the exposed pressure-sensitive adhesive layer 40, The laminated film shown in FIG. 7 was obtained.

Next, a second pressure-sensitive adhesive sheet A was prepared, the release film A of the pressure-sensitive adhesive sheet A was peeled off, and the laminated film shown in FIG. 8 was bonded to the touch sensor panel 60 on the surface of the exposed pressure-sensitive adhesive layer. Got it. In Fig. 8, reference numeral 70 denotes the adhesive layer of the second adhesive sheet A, this corresponds to the third adhesive layer 70, and the reference numeral 71 denotes the release film B of the second adhesive sheet A. .

Next, the release film (B71) was peeled from the laminated film shown in FIG. 8, and the support substrate (supporting substrate 50) of (5) was bonded to the surface of the exposed pressure-sensitive adhesive layer, and laminated as shown in FIG. I got a film.

Next, a third adhesive sheet A was prepared, the release film A of this adhesive sheet A was peeled, and the exposed adhesive layer was applied to the thermoplastic resin film layer 90 (TAC film) of the laminated film shown in FIG. 9. It bonded together, and the laminated film shown in FIG. 10 was obtained. In Fig. 10, reference numeral 30 denotes an adhesive layer of the third adhesive sheet A, this corresponds to the first adhesive layer 20, and reference numeral 31 denotes a release film B of the third adhesive sheet A. .

Finally, the release film B was peeled from the laminated film shown in FIG. 10, and the front plate 10 prepared in (1) was attached to the exposed surface of the pressure-sensitive adhesive layer 30, A laminated film was obtained.

The obtained optical laminated film was cut into a 20 mm x 110 mm rectangle using a laser cutter (manufactured by LPTech, laser light source: Synrad, CO ₂ laser, laser wavelength: 9.3 μm) to obtain an optical laminate. The laser cutter was incident on the front plate 10 side of the optical laminated film, and focused the laser on the surface of the front plate 10. The number of times the laser is irradiated is two. In other words, laser irradiation was performed again at the location where the laser was irradiated at the first time. In each irradiation, the laser power and cutting speed were the same. Other cutting conditions are shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

[Example 2]

An optical laminate was obtained in the same manner as in Example 1 except that the cutting conditions of the optical laminated film with a laser cutter were changed to the conditions shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

[Example 3]

An optical laminate was obtained in the same manner as in Example 1 except that the cutting conditions of the optical laminated film with a laser cutter were changed to the conditions shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

[Example 4]

An optical laminate was obtained in the same manner as in Example 1 except that the cutting conditions of the optical laminated film with a laser cutter were changed to the conditions shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

[Example 5]

An optical laminate was obtained in the same manner as in Example 1 except that the cutting conditions of the optical laminated film with a laser cutter were changed to the conditions shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

[Example 6]

An optical laminate was produced according to the following procedure. This will be described with reference to FIGS. 6 and 12 to 14. Further, an alignment layer is allocated to FIGS. 6 and 12 to 14.

First, it carried out similarly to Example 1, and obtained the laminated film shown in FIG. Next, the release film B is peeled from the laminated film shown in FIG. 6, and the support substrate (supporting substrate 50) of (5) is bonded to the surface of the exposed pressure-sensitive adhesive layer, and the laminated film shown in FIG. 12 Got it.

Next, a second adhesive sheet A was prepared, the release film A of this adhesive sheet A was peeled, and the exposed adhesive layer was applied to the thermoplastic resin film layer 90 (TAC film) of the laminated film shown in FIG. It bonded together, and the laminated film shown in FIG. 13 was obtained. Then, the release film (B31) was peeled from the laminated film shown in FIG. 13, and the front plate 10 prepared in (1) was bonded to the surface of the exposed pressure-sensitive adhesive layer. A laminated film was obtained.

The obtained optical laminated film was cut into cell units (20 mm x 110 mm) using a laser cutter (manufactured by LPTech, laser light source: Synrad, CO ₂ laser, laser wavelength: 9.3 μm) to obtain an optical laminate. . The laser cutter was incident on the front plate 10 side of the optical laminated film, and focused the laser on the surface of the front plate 10. Other cutting conditions are shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

[Example 7]

An optical laminate was obtained in the same manner as in Example 6 except that the cutting of the optical laminated film by a laser cutter was changed to the conditions shown in Table 1. Table 1 shows the evaluation results about the obtained optical laminate.

[Example 8]

An optical laminate was obtained in the same manner as in Example 6 except that the cutting of the optical laminated film by a laser cutter was changed to the conditions shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

[Comparative Example 1]

An optical laminate was obtained in the same manner as in Example 1 except that the cutting of the optical laminated film with a laser cutter was changed to the conditions shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

[Comparative Example 2]

An optical laminate was obtained in the same manner as in Example 1 except that the cutting of the optical laminated film with a laser cutter was changed to the conditions shown in Table 1. Table 1 shows the evaluation results for the obtained optical laminate.

1, 2, 3 optical laminates,
10: front panel,
20: polarizer layer,
30: first adhesive layer,
40: second adhesive layer,
31, 41, 71: release film B,
50: supporting substrate,
60: touch sensor panel,
70: third adhesive layer,
90: thermoplastic resin film,
101: width of the deformation portion,
102: thickness of the top,
103: border,
201: cut plane,
202: irradiation direction,
203: repair,
204: width of the deformation portion,
205: thickness of the top.

Claims (6)

An optical laminate comprising a front plate and a polarizer layer, wherein the optical laminate satisfies the following formula (1), having a deformation portion including at least a portion of an outer peripheral end portion in plan view, and a top portion that is a region other than the deformation portion .
T _N /W _HAZ ≥4.0 (1)
W _HAZ ： Width of deformation part [μm]
T _N : Thickness of the top part [μm] The method of claim 1,
The optical laminated body further satisfying the following formula (2).
1≤M _N /M _HAZ ＜1.15 (2)
M _HAZ ：Compressive modulus of deformed part [MPa]
M _N : Compressive modulus of the upper part [MPa] An optical laminate comprising a front plate and a polarizer layer, wherein the optical laminate satisfies the following formula (2), having a deformation portion including at least a portion of an outer peripheral end portion in plan view, and a top portion that is a region other than the deformation portion .
1≤M _N /M _HAZ ＜1.15 (2)
M _HAZ ：Compressive modulus of deformed part [MPa]
M _N : Compressive modulus of the upper part [MPa] An image display device comprising the optical laminate according to any one of claims 1 to 3. As the manufacturing method of the optical laminated body according to any one of claims 1 to 3,
A manufacturing method comprising a cutting step of cutting an optical laminated film with laser light irradiated from a laser cutter to obtain an optical laminate. The method of claim 5,
When the laser light is irradiated once, the energy per unit length is 150 mJ/mm or less.

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