KR20220092410A - Optical laminate and display device - Google Patents

Abstract

The present invention provides an optical laminate which includes a plurality of optical members, wherein in a first optical member constituting the outermost surface, at least one tip end part in a direction orthogonal to a flexion axis is spaced apart from a layer attached to the first optical member, when bending the first optical member with a bending radius of 4R. The length of the said spaced apart portion is preferably more than 0 mm and 10 mm or less. The thickness of the first optical member is preferably 55 μm or more and 130 μm or less. The peeling force between the first optical member and the layer attached to the first optical member is preferably greater than 0.5 gf/25mm and less than 2.0 gf/25mm. According to the present invention, the present invention provides an optical laminate in which the generation of peeling in an adhesive layer is suppressed when bent, and a display device containing the same.

Description

Optical laminate and display device {OPTICAL LAMINATE AND DISPLAY DEVICE}

The present invention relates to an optical laminate and a display device.

Japanese Patent Application Laid-Open No. 2018-027995 discloses a flexible image display device provided with an adhesive layer having excellent stress relaxation characteristics.

When the image display device including an adhesive layer was bent, there existed a problem that air bubbles and peeling were easy to generate|occur|produce in an adhesive layer or between an adhesive layer and a to-be-adhered member. An object of this invention is to provide the display apparatus containing the optical laminated body by which generation|occurrence|production of peeling in an adhesive layer is suppressed even if it bends, and the said optical laminated body.

This invention provides the optical laminated body and display apparatus illustrated below.

[1] provided with a plurality of optical members,

When bent at a bending radius of 4R, at least one end of the first optical member constituting the outermost surface of the first optical member in a direction orthogonal to the bending axis is adhered to the first optical member. The optical laminate, which is spaced apart from the formed layer.

[2] The optical laminate according to [1], wherein the length of the separation portion is more than 0 mm and 10 mm or less.

[3] The optical laminate according to [1] or [2], wherein the first optical member has a thickness of 55 µm or more and 130 µm or less.

[4] The optical laminate according to any one of [1] to [3], wherein the peeling force between the first optical member and the layer adhered to the first optical member is more than 0.5 gf/25 mm and less than 2.0 gf/25 mm. .

[5] The optical laminate according to any one of [1] to [4], wherein the first optical member is a film capable of peeling the entire surface.

[6] The optical laminate according to any one of [1] to [5], wherein the first optical member has a tensile modulus of elasticity at a temperature of 23°C of 1000 MPa or more and 8000 MPa or less.

[7] The optical laminate according to any one of [1] to [6], further comprising an adhesive layer.

[8] A display device comprising the optical laminate according to any one of [1] to [7].

[9] The display device according to [8], wherein the first optical member is bent outward.

[Effects of the Invention]

ADVANTAGE OF THE INVENTION According to this invention, when it bend|folds, the optical laminated body by which generation|occurrence|production of peeling in an adhesive layer was suppressed, and the display apparatus containing this are provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows typically the space|interval of a 1st optical member when an optical laminated body is bent.
It is a schematic diagram explaining the repulsive force which arises when an optical laminated body is bent.
It is a schematic top view which shows typically an example of the spacing of the edge part of a 1st optical member.
It is a schematic sectional drawing which shows typically an example of the optical laminated body which concerns on this invention.
5 is a schematic cross-sectional view schematically showing an example of an image display device according to the present invention.
It is a schematic sectional drawing which shows typically an example of the optical laminated body which concerns on this invention.
It is a schematic sectional drawing which shows typically another example of the optical laminated body which concerns on this invention.
It is a schematic diagram explaining the method of the bending test of an optical laminated body.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of the optical laminated body which concerns on this invention is described referring drawings, this invention is not limited to the following embodiment. In all of the drawings below, the scales are appropriately adjusted to facilitate understanding of each component, and the scale of each component shown in the drawings does not necessarily coincide with the scale of the actual component.

<Optical laminate>

The optical laminated body of this invention is demonstrated, referring FIG. The optical laminate 100 illustrated in FIG. 1 includes a plurality of optical members (first optical member 110a and second optical member 110b), and includes a first optical member 110a and a second optical member ( 110b) is laminated|stacked via the bonding layer 120. When the optical laminate 100 is bent to a bending radius of 4R (4 mm), the first optical member 110a constituting the outermost surface with respect to the bending is a layer ( 120), its ends are spaced apart. The bending position may be the edge part of the optical laminated body 100, and a position other than that, for example, center vicinity may be sufficient as it. The 1st optical member 110a can comprise the surface on the opposite side to the side bonded to the image display element of the optical laminated body 100, for example, when the optical laminated body 100 is used for an image display apparatus. have. The 1st optical member 110a can become a visual recognition side when the optical laminated body 100 is used for an image display apparatus.

When the 1st optical member 110a is an optical member containing a bonding layer, the 1st optical member 110a may be stuck directly to the 2nd optical member 110b. When the optical laminated body 100 is bent to a bending radius of 4R (4 mm), the 1st optical member 110a which comprises an outermost surface with respect to a bending|flexion is the 2nd stuck to the 1st optical member 110a. The end is spaced apart from the optical member 110b.

As shown in FIG. 2, when the optical laminated body 100 is bent, the force (arrow in a figure) to which the edge part of the optical laminated body 100 bends will arise. When the repulsive force acting in the direction in which the end is bent is large, if the optical laminate 100 is placed in the image display device 200 to suppress the bending of the end, the pressure-sensitive adhesive layer included in the image display device 200 prevents cohesive failure Occasionally, peeling may occur in the pressure-sensitive adhesive layer or between the pressure-sensitive adhesive layer and the adherend member by causing interfacial breakage between the pressure-sensitive adhesive layer and the adherend member (in this specification, referred to as “peelability in the pressure-sensitive adhesive layer”) has exist). In particular, when the end of the optical laminate 100 is further bent in the opposite direction to the curvature, that is, when the optical laminate 100 is bent with the same surface inside in two or more places, peeling in the pressure-sensitive adhesive layer is more more likely to occur In the optical laminate 100 according to the present invention, the end of the first optical member 110a is spaced apart from the layer adhered to the first optical member 110a, whereby peeling in the pressure-sensitive adhesive layer can be suppressed. have. Although the optical laminated body 100 makes the 1st optical member 110a inside or outside, and is bendable, when it bends especially making the 1st optical member 110a outside, it suppresses generation|occurrence|production of peeling in an adhesive layer. can do. Even if the optical laminated body 100 bends so that a bending radius may become 4R with the 1st optical member 110a outward, for example, peeling in an adhesive layer does not arise.

The bending includes a form of bending in which a curved surface is formed in the bent portion. In the form of bending, the bending radius of the bent inner surface is not particularly limited. Further, the bending includes a form of refraction in which the refraction angle of the inner surface is greater than 0° and less than 180°, and a form of folding in which the bending radius of the inner surface is close to zero or the refraction angle of the inner surface is 0°.

At the time of bending of the optical laminated body 100, at least one edge part of the 1st optical member 110a in the direction orthogonal to a bending axis is spaced apart from the layer adhered to the 1st optical member 110a. As for the 1st optical member 110a, one edge part of the direction orthogonal to a bending axis may be spaced apart, and both ends may be spaced apart. From the viewpoint of reducing peeling in the pressure-sensitive adhesive layer when the optical laminate 100 is bent, at least a part of the end portion may be separated from each other. When the optical laminate 100 is bent to a bending radius of 4R, the length of the portion where the first optical member 110a is spaced apart is preferably more than 0 mm and 10 mm or less from the end in the direction orthogonal to the bending axis, 3 mm or more may be sufficient. As shown in FIG. 3, the bent optical laminated body 100 has the spaced part 101 of the 1st optical member 110a, and the sticking part 102 which is not spaced apart in a planar view. . The length of the spaced portion is the maximum value of the length A of the spaced portion from the end of the optical laminate 100 .

When the optical laminate 100 is not bent, or when it is bent with a bending radius exceeding 4R, the end of the first optical member 110a is spaced apart from the layer to which the first optical member 110a is adhered, It may be present or it does not need to be spaced apart. The 1st optical member 110a may be spaced apart at the time of a bending|flexion, for example by not having a bonding layer in an edge part, or peeling off at least one part of an edge part beforehand. The optical laminated body 100 bends the optical laminated body 100 by making small the peeling force of the 1st optical member 110a, especially the peeling force of an edge part, or enlarging the thickness of the 1st optical member 110a. When bending to a radius of 4R, you may adjust so that the edge part may be separated naturally.

The optical laminate 100 may have a rectangular shape, for example, in a plan view, preferably a rectangular shape having a long side and a short side, and more preferably a rectangle. When the shape in the planar view of the optical laminated body 100 is a rectangle, the length of the long side may be 10 mm or more and 1400 mm or less, for example, Preferably they are 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. As for each layer which comprises the optical laminated body 100, each part may be R-processed, an edge part may be notched, or punching process may be carried out.

The thickness of the optical laminate 100 is not particularly limited because it varies depending on the functions required for the optical laminate, the use of the optical laminate, and the like, but is, for example, 20 µm or more and 500 µm or less, preferably 50 µm or more and 300 µm or more. It is micrometer or less, More preferably, they are 70 micrometers or more and 200 micrometers or less.

The optical laminated body 100 can be used for an image display apparatus etc., for example. The image display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescence display device. Even if it bends, the optical laminated body 100 in which peeling in an adhesive layer does not arise is suitable for a flexible display (a slide-type screen expansion display is included).

(optical member)

The optical laminate 100 includes a plurality of optical members. The optical member constituting the optical laminate 100 may be a component used in a normal image display apparatus. As an optical member, a protection film, a front plate, an impact-resistant film, a polarizing plate, a coloring member, a touch sensor panel etc. are mentioned, for example. The first optical member 110a constituting the outermost surface of the optical laminate 100 is preferably a protection film or a front plate.

The film in which the whole surface can peel may be sufficient as the 1st optical member 110a. After passing through manufacture, a test, etc. of the optical laminated body 100 provided with the 1st optical member 110a, you may peel the 1st optical member 110a whole surface. The peelable film has, for example, an adhesive layer, Preferably it is bonded by the said adhesive layer.

The thickness of the 1st optical member 110a is 20 micrometers or more and 200 micrometers or less, for example, Preferably they are 55 micrometers or more and 200 micrometers or less, More preferably, they are 55 micrometers or more and 130 micrometers or less, More preferably, they are 70 It is more than micrometer and 130 micrometers or less. From a viewpoint of making it easy to peel the edge part of the 1st optical member 110a at the time of bending, it is preferable that the thickness of the 1st optical member 110a is large. When the thickness of the 1st optical member 110a is too large, the bending|flexion of the optical laminated body 100 may become difficult, or it may become easy to generate|occur|produce wrinkles at the time of lamination|stacking.

The peeling force between the layer affixed to the 1st optical member 110a and the 1st optical member 110a is 0.1 gf/25 mm or more and 20 gf/25 mm or less, for example, Preferably they are 0.1 gf/25 mm. It is 5.0 gf/25 mm or less, More preferably, it is more than 0.5 gf/25 mm and less than 2.0 gf/25 mm. From a viewpoint of making it easy to peel the edge part of the 1st optical member 110a at the time of bending, it is preferable that peeling force is small. When peeling force is too small, protection of the surface of the optical laminated body 100 may become inadequate. Peel force can be measured according to the method described in the Example mentioned later.

The first optical member 110a has, for example, a tensile modulus of elasticity at a temperature of 23 ° C. of 1000 MPa or more and 8000 MPa or less, preferably 1500 MPa or more and 6000 MPa or less, more preferably 2000 MPa or more and 5000 MPa or less, , 3000 MPa or more may be sufficient. When the tensile modulus of elasticity is too low, there is a possibility that the function of protecting the surface of the optical laminate 100 of the first optical member 110a becomes insufficient. When the tensile modulus of elasticity is too large, bending of the optical laminate 100 may become difficult. When the tensile modulus of elasticity is in this range, the optical laminate 100 tends to cause peeling in the pressure-sensitive adhesive layer, but by spacing the ends of the first optical member 110a apart, peeling in the pressure-sensitive adhesive layer can be effectively suppressed. have. The tensile modulus of elasticity can be measured according to the description of Examples described later.

(protection film)

A protection film has a function of protecting surfaces, such as the optical laminated body 100, and may be a laminated body of a resin film and an adhesive layer normally. A thermoplastic resin may be sufficient as resin which comprises a resin film. A protection film is peeled and removed for every adhesive layer, after the optical laminated body provided with a protection film is bonded by an image display element, for example. A resin film, For example, Polyolefin resins, such as a polyethylene-type resin, a polypropylene-type resin, and a cyclic polyolefin-type resin; polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate; polycarbonate-based resin; It can be comprised with (meth)acrylic-type resin etc. (meth)acryl represents at least 1 sort(s) chosen from the group which consists of acryl and methacryl. The same applies to other terms to which "(meta)" is assigned.

The thickness of the resin film constituting the protection film may be, for example, 5 µm or more and 200 µm or less, preferably 10 µm or more and 180 µm or less, more preferably 20 µm or more and 150 µm or less, still more preferably 30 µm or more and 120 µm or less. When thickness is 5 micrometers or more, protection of the optical laminated body 100 can fully be performed, and it is advantageous also from the point of handleability. When thickness is 200 micrometers or less, it is advantageous from the point of cost and the rework property of a protection film.

The peeling force of a protection film is 0.1 gf/25 mm or more and 20 gf/25 mm or less, for example, Preferably they are 10 gf/25 mm or less, More preferably, they are 5.0 gf/25 mm or less. When the lower limit of the peeling force is equal to or greater than the above range, the surface of the optical laminate 100 can be sufficiently protected. The protection film can be easily peeled from the optical laminated body 100 as the upper limit of peeling force is below the said range. When the 1st optical member 110a is a protection film which is a laminated body of a resin film and an adhesive layer, the spacing of the edge part of the 1st optical member 110a is the resin film which comprises a protection film, and the adhesive which comprises a protection film. It is not the space|interval between layers, but the space|interval between the layer affixed to the protection film and the adhesive layer which comprises a protection film.

(front panel)

The front plate is not limited in material and thickness as long as it is a plate-like body capable of transmitting light, and may have a single-layer structure or a multi-layer structure. For example, a resin plate, a resin sheet, a resin film, etc.) and the laminated body of the plate-shaped object made from glass, and the plate-shaped object made from resin are illustrated. The front plate may be a layer constituting the outermost layer on the viewer side of the image display device.

As the glass plate, tempered glass for a display is preferably used. The thickness of the glass plate is, for example, 20 µm or more and 200 µm or less, and may be 20 µm or more and 100 µm or less. By using the glass plate, the front plate can have excellent mechanical strength and surface hardness.

As a resin film, if it is a resin film which can transmit light, it will not be limited. For example, triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly(meth)acrylic, Polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether sulfone, poly and films formed of polymers such as methyl (meth)acrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymer|macromolecules can be used individually or in mixture of 2 or more types. When the optical laminate 100 is used for a flexible display, a resin film formed of a polymer such as polyimide, polyamide, or polyamideimide, which has excellent flexibility, can be configured to have high strength and high transparency, is preferably used. used

When a front plate is a resin film, the film which provided the hard-coat layer in at least one surface of a base film, and improved hardness more may be sufficient as a resin film. In this case, the hard coating layer constitutes the front plate. The hard-coat layer may be formed in one surface of a base film, and may be formed in both surfaces. When the image display apparatus mentioned later is an image display apparatus of a touchscreen system, since the surface of a front plate becomes a touch surface, the resin film which has a hard-coat layer is used preferably. By providing a hard-coat layer, it can be set as the resin film which improved hardness and scratch resistance. The hard coat layer is, for example, a cured layer of 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 the additive in order to improve intensity|strength. The additive is not limited, and inorganic fine particles, organic fine particles, or a mixture thereof may be mentioned. The thickness of a resin film is 5-200 micrometers, for example, Preferably they are 20 micrometers or more and 200 micrometers or less, More preferably, they are 55 micrometers or more and 130 micrometers or less.

The peeling force of the front plate is, for example, 0.1 gf/25 mm or more and 20 gf/25 mm or less, preferably 10 gf/25 mm or less, and more preferably 5.0 gf/25 mm or less. When peeling force is too small, protection of the surface of the optical laminated body 100 may become inadequate. When the first optical member 110a is the front plate, the spacing of the end of the first optical member 110a is the spacing between the front plate and the pressure-sensitive adhesive layer or the adhesive layer.

The front plate may not only have a function to protect the front surface of an image display apparatus, but may have a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, etc.

(impact resistant film)

An impact-resistant film is a film for protecting a coloring member, a polarizing plate, etc. from the impact from the outside. The impact-resistant film may include a thermoplastic resin, for example, a polyolefin-based resin such as a polyethylene-based resin, a polypropylene-based resin, or a cyclic polyolefin-based resin; polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate; polycarbonate-based resin; It can be comprised with (meth)acrylic-type resin etc. An impact-resistant film may be comprised by a single layer, and may be comprised by multilayer. The impact-resistant film may be the same as the resin film used for the front plate.

The thickness of the impact resistant film may be, for example, 5 µm or more and 100 µm or less, preferably 10 µm or more and 90 µm or less, and more preferably 20 µm or more and 80 µm or less. When thickness is less than 5 micrometers, protection of a coloring member or a polarizing plate may become inadequate, and it is also disadvantageous also from the point of handleability. It is preferable to make thickness into 100 micrometers or less from a viewpoint of improving a flexibility.

(Polarizer)

A linear polarizing plate may be sufficient as a polarizing plate, and a circular polarizing plate may be sufficient as it. As a linear polarizing plate, the film etc. which contain the stretched film or stretched layer to which the dichroic dye was adsorbed, or the film which apply|coated and hardened the dichroic dye as a polarizer are mentioned. As a dichroic dye, iodine and a dichroic organic dye are specifically used. The dichroic organic dye includes a dichroic direct dye composed of a disazo compound such as C.I.DIRECT RED 39, and a dichroic direct dye composed of a compound such as trisazo and tetrakisazo.

Polymerizable, such as a layer obtained by coating and curing a composition containing a dichroic dye having liquid crystallinity, or a composition containing a dichroic dye and a polymerizable liquid crystal, as a film used as a polarizer by coating and curing a dichroic dye The film containing the hardened|cured material of a liquid crystal compound, etc. are mentioned. Since there is no restriction|limiting in a bending direction, compared with the stretched film or the stretched layer to which the dichroic dye was apply|coated and hardened|cured film is adsorbed, it is preferable.

A linear polarizing plate may be comprised only with a polarizer, and in addition to a polarizer, may further contain the thermoplastic resin film, a base material, an orientation film, and a protective layer. The thickness of a linear polarizing plate is 2 micrometers or more and 100 micrometers or less, for example, Preferably they are 10 micrometers or more and 60 micrometers or less.

(1) Linear polarizing plate provided with a stretched film or a stretched layer as a polarizer

The linear polarizing plate provided with the stretched film to which the dichroic dye was made to adsorb|suck as a polarizer is demonstrated. The stretched film to which the dichroic dye, which is a polarizer, is adsorbed is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, dyeing the polyvinyl alcohol-based resin film with a dichroic dye, a step of adsorbing the dichroic dye, It can be manufactured through the process of treating the polyvinyl alcohol-type resin film to which the dichroic dye has adsorbed with the aqueous boric acid solution, and the process of washing with water after the process with the aqueous boric acid solution. Such a polarizer may be used as a linear polarizing plate as it is, and what bonded together the thermoplastic resin film mentioned later on the single side|surface or both surfaces may be used as a linear polarizing plate.

The thickness of a polarizer is 30 micrometers or less normally, Preferably it is 18 micrometers or less, More preferably, it is 15 micrometers or less. Making the thickness of a polarizer thin is advantageous for thinning of a polarizing plate. The thickness of a polarizer may be 1 micrometer or more normally, for example, 5 micrometers or more may be sufficient.

Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate-type resin. As polyvinyl acetate-type resin, other than polyvinyl acetate which is a homopolymer of vinyl acetate, the copolymer of vinyl acetate and other monomer copolymerizable to it is used. Examples of the other monomer copolymerizable with vinyl acetate include an unsaturated carboxylic acid-based compound, an olefin-based compound, a vinyl ether-based compound, an unsaturated sulfone-based compound, and a (meth)acrylamide-based compound having an ammonium group.

The saponification degree of polyvinyl alcohol-type resin is 85 mol% or more and 100 mol% or less normally, Preferably they are 98 mol% or more. The polyvinyl alcohol-type resin may be modified|denatured, for example, polyvinyl formal and polyvinyl acetal modified|denatured with aldehydes can also be used. The polymerization degree of polyvinyl alcohol-type resin is 1000 or more and 10000 or less normally, Preferably they are 1500 or more and 5000 or less.

Next, the linear polarizing plate provided with the extending|stretching layer which made the dichroic dye adsorb|suck as a polarizer is demonstrated. The stretched layer to which the dichroic dye, which is a polarizer, is adsorbed is usually a process of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, a process of uniaxially stretching the obtained laminated film, a uniaxially stretched laminated film By dyeing the polyvinyl alcohol-based resin layer with a dichroic dye, the dichroic dye is adsorbed to form a polarizer; It can be manufactured through a process. You may peel and remove a base film from a polarizer as needed. The material and thickness of a base film may be the same as that of the thermoplastic resin film mentioned later and thickness.

The polarizer which is a stretched film or a stretched layer may be knitted into the laminated body in the form by which the thermoplastic resin film is pasted together on the single side|surface or both surfaces. This thermoplastic resin film can function as a protective film for polarizers or retardation film. A thermoplastic resin film, For example, Polyolefin resins, such as chain|strand polyolefin resin (polypropylene resin etc.) and cyclic polyolefin resin (norbornene type resin etc.); Cellulose-type resin, such as a triacetyl cellulose; polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polycarbonate-based resin; (meth)acrylic resin; Alternatively, it may be a film made of a mixture thereof or the like.

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, and still more preferably 60 µm or less from the viewpoint of reducing the thickness of the thermoplastic resin film. It is micrometer or less, and is 5 micrometers or more normally, Preferably it is 20 micrometers or more. The thermoplastic resin film may or may not have retardation. A thermoplastic resin film can be bonded together to a polarizer using the bonding layer mentioned later, for example.

(2) A linear polarizing plate having a film cured by applying a dichroic dye as a polarizer

The linear polarizing plate provided with the film which apply|coated and hardened a dichroic dye as a polarizer is demonstrated. A film obtained by coating and curing a dichroic dye used as a polarizer is a film obtained by applying a composition comprising a dichroic dye having liquid crystallinity or a composition comprising a dichroic dye and a liquid crystal compound to a substrate and curing it. can be heard The said film may peel a base material or may use it as a linear polarizing plate together with a base material, or may use it as a linear polarizing plate with the structure which has a thermoplastic resin film on the single side|surface or both surfaces.

The substrate may be a thermoplastic resin film. The base material and thickness may be the same as what was illustrated in description of the above-mentioned thermoplastic resin film. The thermoplastic resin film which has a hard-coat layer, an antireflection layer, or an antistatic layer on at least one surface may be sufficient as a base material. As for the base material, a hard-coat layer, an antireflection layer, an antistatic layer, etc. may be formed only on the surface of the side on which the polarizer is not formed. As for the base material, a hard-coat layer, an antireflection layer, an antistatic layer, etc. may be formed only in the surface of the side in which the polarizer is formed.

As a thermoplastic resin film, the thing similar to the linear polarizing plate provided with the said stretched film or a stretched layer as a polarizer is mentioned. A thermoplastic resin film can be bonded to a polarizer using an adhesive agent or an adhesive, for example.

It is preferable that the film cured by applying a dichroic dye is thin, but when it is too thin, the strength decreases and the workability tends to be inferior. The thickness of the said film is 20 micrometers or less normally, Preferably they are 5 micrometers or less, More preferably, they are 0.5 micrometer or more and 3 micrometers or less.

Specifically, as a film which apply|coated and hardened the dichroic dye, the thing of Unexamined-Japanese-Patent No. 2013-37353, Unexamined-Japanese-Patent No. 2013-33249, etc. are mentioned.

The polarizing plate may be a circular polarizing plate including a linear polarizing plate and a retardation film. The circular polarizing plate in which the linear polarizing plate and the retardation layer are arranged so that the absorption axis of the linear polarizing plate and the slow axis of the retardation layer are at a predetermined angle can exhibit an antireflection function.

The number of retardation layers may be one, or two or more layers may be sufficient as them. The retardation layer may have an overcoat layer which protects the surface, the base film etc. which support the retardation layer. The phase difference layer includes, for example, a phase difference layer (λ/4 layer) imparting a phase difference of λ/4, a phase difference layer (λ/2 layer) imparting a phase difference of λ/2, and a positive C layer. The retardation layer preferably includes a λ/4 layer, and more preferably includes at least any of a λ/4 layer, a λ/2 layer, or a positive C layer. When the retardation layer includes the λ/2 layer, the λ/2 layer and the λ/4 layer are sequentially laminated from the linear polarizing plate side. When the retardation layer contains the positive C layer, the λ/4 layer and the positive C layer may be sequentially laminated from the linear polarizing plate side, or the positive C layer and the λ/4 layer may be laminated sequentially from the linear polarizing plate side. The thickness of the retardation layer is, for example, 0.1 µm or more and 10 µm or less, preferably 0.5 µm or more and 8 µm or less, and more preferably 1 µm or more and 6 µm or less.

The retardation layer may be formed from the resin film exemplified as the material of the above-mentioned thermoplastic resin film, or may be formed from a layer in which the polymerizable liquid crystal compound is cured. The retardation layer may further include an alignment film. The retardation layer may have a bonding layer for bonding the λ/4 layer, the λ/2 layer, and the positive C layer.

When the retardation layer is formed by curing the polymerizable liquid crystal compound, the retardation layer can be formed by applying and curing a composition containing the polymerizable liquid crystal compound to a base film. You may form an orientation film between a base film and an application layer. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film. When forming a retardation layer from the layer formed by hardening|curing a polymeric liquid crystal compound, the retardation layer may be knitted together in the optical laminated body in the form which has an orientation film and a base film. A retardation layer can be bonded together on the surface on the opposite side to the visual recognition side of a linear polarizing plate via the bonding layer mentioned later.

A polarizing plate in which the linear polarizing plate and the retardation layer are arranged so that the absorption axis of the linear polarizing plate and the slow axis of the retardation layer are at a predetermined angle, that is, can function as a circular polarizing plate having an antireflection function. When the retardation layer includes the λ/4 layer, an angle between the absorption axis of the linear polarizing plate and the slow axis of the λ/4 layer may be 45°±10°. The retardation layer may have forward wavelength dispersion and may have reverse wavelength dispersion. The λ/4 layer preferably has reverse wavelength dispersion. The linear polarizing plate and the retardation layer may be bonded together by the bonding layer.

(no coloring)

The coloring member includes a coloring layer in order to shield an electrode, wiring, or the like, or to suppress light leakage from a display unit provided in an image display device. On one surface of the colored member, the pressure-sensitive adhesive layer is usually laminated in contact with the colored member.

The coloring member may further include at least one of a separation layer and a protective layer in addition to the colored layer. When the coloring member includes a separation layer and a protective layer, the coloring member may include, for example, a protective layer, a colored layer, and a separation layer in this order, and may include a colored layer, a protective layer, and a separation layer in this order. do. When the coloring member includes a separation layer and a protective layer, the coloring member may have a colored layer laminated from the separation layer to the viewing side, and the separation layer may be laminated from the coloring layer to the viewing side. The coloring member is preferably laminated so as to become a protective layer, a colored layer, and a separation layer from the viewing side, or laminated so as to become a colored layer, a protective layer, and a separation layer from the viewing side.

The thickness of the coloring member may be, for example, 0.1 µm or more and 10 µm or less, preferably 1 µm or more and 7 µm or less, and more preferably 1 µm or more and 6 µm or less.

(colored layer)

The colored layer may have a shielding property in order to shield an electrode, a wiring, or the like, or to suppress light leakage from a display unit provided in an image display device.

The shape and color of the colored layer are not limited, and, for example, can be appropriately selected according to the use and design of the display device using the laminate. The colored layer may be provided so that it may be arrange|positioned partially in the planar view of a laminated body, for example, may be provided so that it may be arrange|positioned in the peripheral part in the planar view of a laminated body.

A single layer structure may be sufficient as a colored layer, and a multilayer structure may be sufficient as it. When the colored layer has a multilayer structure, at least one of the two or more layers is a colorant-containing layer containing a colorant, and the remaining layers may or may not contain a colorant. As a color of a coloring agent, black, red, white, dark blue, silver, gold, etc. are illustrated.

The thickness of the colored layer may be, for example, 0.1 µm or more and 5 µm or less. When the thickness of the colored layer is too large and the colored layer is partially formed in a planar view of the layered product, there is a tendency for a step to easily occur on the surface of the layered product. On the other hand, when the thickness of a colored layer is too small, there exists a tendency for sufficient light-shielding property to become difficult to be obtained. The thickness of the colored layer is preferably 0.5 µm or more and 4 µm or less, more preferably 1 µm or more and 3 µm or less, and still more preferably 1 µm or more and 2 µm or less. The thickness refers to the maximum thickness of the colored layer.

The optical density of the colored layer may be, for example, 2 or more, preferably 3 or more, more preferably 4 or more, still more preferably 5 or more. Although the upper limit of the optical density of a colored layer is not specifically limited, For example, 10 or less may be sufficient and 7 or less may be sufficient.

As for the colored layer, the optical density per 1 µm in thickness may be, for example, 1.8 or more, preferably 2 or more, more preferably 2.5 or more, still more preferably 2.7 or more.

The optical density is measured as follows. A colored layer is formed on the glass substrate. This sample is set in an optical density meter (for example, product name manufactured by X-rite: 361T), the upper light source positioned on the colored layer side of the sample is turned on, and the colored layer of the sample is focused. After the upper light source is turned off, the light source for measurement located on the base material side of the sample is turned on, and the optical density is measured using the colored layer as a measurement area.

When the colored layer is formed in the peripheral portion of the optical laminate in plan view, the width of the colored layer can be, for example, 0.5 mm or more, 3 mm or more, 5 mm or more, and usually It is 80 mm or less, 60 mm or less may be sufficient, 50 mm or less may be sufficient, 30 mm or less may be sufficient, and 20 mm or less may be sufficient as it. In the present specification, planar view means viewing in the thickness direction of the layer.

The colored layer can be formed by a printing method using ink or paint, a vapor deposition method using a powder of a metal pigment, a photolithography method using a composition for forming a colored layer, or the like. The photolithography method is preferable from a viewpoint of making the thickness of a colored layer small and raising an optical density.

When the colored layer is formed by photolithography, an active energy ray-curable resin composition for forming a colored layer is applied on a support, a coating film of the photosensitive resin composition is exposed, then developed, and then baked can be done As an exposure light source, a mercury vapor arc, a carbon arc, a Xe arc, etc. which emit light with a wavelength of 250 nm or more and 450 nm or less can be used. A glass plate etc. can be used as a support body. In order to facilitate peeling of the colored layer from the glass plate, a separation layer may be formed on the glass plate, and a colored layer may be formed on the separation layer.

The active energy ray-curable composition for forming a colored layer may include, for example, a binder resin, a colorant, a solvent, and optional additives. When the composition for colored layer formation is an active energy ray hardening type, the composition for colored layer formation contains an active energy ray polymeric compound further. Moreover, a photoinitiator, a photosensitizer, etc. are made to contain as needed.

Examples of the binder resin include chlorinated polyolefins (eg, chlorinated polyethylene, chlorinated polypropylene), polyester-based resins, urethane-based resins, (meth)acrylic-based resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose-based resins. have. Binder resin may be used independently and may use 2 or more types together. Binder resin may be thermally polymerizable resin, or photopolymerizable resin may be sufficient as it.

The colorant may be black in order to easily increase the shielding effect of the color layer. The composition for forming a colored layer preferably contains carbon black. Examples of the colorant other than carbon black include inorganic pigments such as titanium white, zinc oxide, iron black, bengala, chrome vermillion, ultramarine blue, cobalt blue, yellow wax, and titanium yellow; organic pigments or dyes such as phthalocyanine blue, indanthrone blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, and aniline black; metal pigments composed of flaky flakes such as aluminum and brass; and pearlescent pigments (pearl pigments) composed of flaky flakes such as titanium dioxide-coated mica and basic lead carbonate. It is preferable that 50 mass parts or more and 200 mass parts or less of a coloring agent are contained with respect to 100 mass parts of binder resins.

The colored layer may have a tapered portion so as to increase in thickness in a direction from the end of the colored layer toward the inside of the colored layer. When a colored layer has a tapered part, when bonding an adhesive layer and a coloring member together, there exists a tendency for it to become easy to suppress the bite of a bubble. When the colored layer is formed by the photolithography method described above, it tends to be easy to provide a tapered portion in the end region of the colored layer.

(separation layer)

A separation layer has a function for making it easy to isolate|separate the support body used in the manufacturing process of a colored layer, and a colored layer. The separation layer may be, for example, an inorganic material layer or an organic material layer. These layers can be formed by a spin coating method, a sputtering method, a vapor deposition method, or the like. As a material for forming the inorganic substance layer, for example, silicon oxide is exemplified. As a material which forms an organic substance layer, a (meth)acrylic-type resin composition, an epoxy-type resin composition, a polyimide-type resin composition, etc. are mentioned, for example. The colored layer and separation layer isolate|separated from the support body can transcribe|transfer the separation layer side to another optical member through a bonding layer. The thickness of the separation layer may be, for example, 0.01 µm or more and 1 µm or less, and preferably 0.05 µm or more and 0.5 µm or less.

(protective layer)

The protective layer protects the colored layer and has a function of flattening the level difference caused by the colored layer. The protective layer may be an organic layer or an inorganic layer. As materials for the inorganic layer and the organic layer, the same materials as those shown in the description of the separation layer can be used. These layers can be formed by a spin coating method, a sputtering method, a vapor deposition method, or the like. The thickness of the protective layer may be, for example, 0.1 µm or more and 10 µm or less, and preferably 0.5 µm or more and 5 µm or less.

(Adhesive layer)

An adhesive layer can bond a coloring member and another layer by being laminated|stacked in contact with a coloring member. In the optical laminate 100, when the coloring member is formed of a colored layer and a separation layer, preferably, the colored layer side is bonded to another layer via an adhesive layer. When the colored member is formed by laminating a protective layer, a colored layer, and a separation layer in this order, preferably, the protective layer side is bonded to the other layer via an adhesive layer. As an example, when the image display apparatus on which the optical laminated body 100 was laminated|stacked is bent, the adhesive layer used for bonding of a coloring member will be easy to raise|generate a cohesive failure.

In this specification, an adhesive is also called a pressure-sensitive adhesive. On the other hand, the adhesive refers to an adhesive other than the pressure-sensitive adhesive (pressure-sensitive adhesive), and is clearly distinguished from the pressure-sensitive adhesive. Although the adhesive layer may consist of two or more layers, Preferably it is one layer.

The pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition containing as a main component (base polymer) a resin such as (meth)acrylic, rubber, urethane, ester, silicone, or polyvinyl ether. Especially, the adhesive composition which uses as a base polymer (meth)acrylic-type resin excellent in transparency, weather resistance, heat resistance, etc. is preferable. An active energy ray hardening type or a thermosetting type may be sufficient as an adhesive composition.

As the (meth)acrylic resin used in the pressure-sensitive adhesive composition, one type of (meth)acrylic acid ester such as (meth)butyl acrylate, (meth)ethyl acrylate, (meth)acrylate isooctyl, (meth)acrylic acid 2-ethylhexyl, or The polymer or copolymer which uses 2 or more types as a monomer is used preferably. It is preferable to copolymerize a polar monomer with a base polymer. As the polar monomer, (meth)acrylic acid compound, (meth)acrylic acid 2-hydroxypropyl compound, (meth)acrylic acid 4-hydroxybutyl compound, (meth)acrylic acid hydroxyethyl compound, (meth)acrylamide compound, N, Monomers having a carboxy group, a hydroxyl group, an amide group, an amino group, an epoxy group, etc., such as an N-dimethylaminoethyl (meth)acrylate compound and a glycidyl (meth)acrylate compound, are mentioned.

Although the adhesive composition may contain only the said base polymer, normally, it further contains a crosslinking agent. Examples of the crosslinking agent include a metal ion having a divalent or higher valence, a metal ion forming a carboxylate metal salt with a carboxyl group, a polyamine compound forming an amide bond with a carboxyl group, a polyepoxy compound forming an ester bond with a carboxyl group, or A polyisocyanate compound which forms an amide bond between a polyol and a carboxy group is illustrated. The crosslinking agent is preferably a polyisocyanate compound.

The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by irradiation with active energy rays such as ultraviolet rays or electron beams, has adhesiveness even before irradiation with active energy rays, and can be adhered to an adherend such as a film, and is irradiated with active energy rays It is a pressure-sensitive adhesive composition having a property that can be cured by the adhesion can be adjusted. It is preferable that an active energy ray hardening-type adhesive composition is an ultraviolet curable type. In addition to a base polymer and a crosslinking agent, an active energy ray hardening-type adhesive composition contains an active energy ray polymeric compound further. Moreover, a photoinitiator, a photosensitizer, etc. are made to contain as needed.

As an active energy ray polymeric compound, For example, the (meth)acrylate monomer which has at least 1 piece(s) acryloyloxy group in a molecule|numerator; (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 heard The pressure-sensitive adhesive composition may contain 0.1 parts by mass or more of the active energy ray polymerizable compound with respect to 100 parts by mass of the solid content of the pressure-sensitive adhesive composition, and may contain 10 parts by mass or less, 5 parts by mass or less, or 2 parts by mass or less.

As a photoinitiator, benzophenone, benzyl dimethyl ketal, 1-hydroxycyclohexyl ketone etc. are mentioned, for example. A photoinitiator may contain 1 type or 2 or more types. When an adhesive composition contains a photoinitiator, 0.01 mass part or more and 3.0 mass parts or less may be sufficient as the total content, for example with respect to 100 mass parts of solid content of an adhesive composition.

The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders and other inorganic powders, etc.), antioxidants, ultraviolet rays Additives such as absorbents, dyes, pigments, colorants, defoamers, corrosion inhibitors, and photoinitiators may be included.

An adhesive layer can be formed by apply|coating the organic solvent dilution liquid of the said adhesive composition on a base material, and drying it. When an active energy ray hardening-type adhesive composition is used, it can be set as the adhesive layer which has a desired degree of hardening by irradiating an active energy ray to the formed adhesive layer.

It is preferable that the thickness of an adhesive layer is larger than the thickness of a colored layer from a viewpoint of absorbing the level difference produced by a colored layer, More preferably, it is 4 micrometers or more, More preferably, it is 5 micrometers or more. From a flexible viewpoint, the thickness of an adhesive layer becomes like this. Preferably it is 100 micrometers or less, More preferably, it is 50 micrometers or less. The thickness of the pressure-sensitive adhesive layer is the maximum thickness of the pressure-sensitive adhesive layer.

(Touch sensor panel)

As the touch sensor panel, as long as it is a sensor capable of detecting the touched position, the detection method is not limited, and a touch sensor panel such as a resistive film method, a capacitive coupling method, a photosensor method, an ultrasonic method, an electromagnetic inductive coupling method, a surface acoustic wave method, etc. This is exemplified. Since it is low cost, the touch sensor panel of a resistive film type or a capacitive coupling type is used preferably.

An example of a resistive touch sensor panel includes a pair of substrates disposed 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; It is constituted by a touch position detection circuit. In an image display device provided with a resistive touch sensor panel, when the surface of the front plate is touched, the opposing resistive film is short-circuited, and a current flows through the resistive film. A touch position detecting circuit detects a change in voltage at this time, and the touched position is detected.

An example of the touch sensor panel of the capacitive coupling method is comprised by the board|substrate, the transparent electrode for position detection provided on the front surface of the board|substrate, and a touch position detection circuit. In an image display device provided with a capacitively coupled touch sensor panel, when the surface of the front plate is touched, the transparent electrode is grounded through the human body's capacitance at the touched point. The touch position detecting circuit detects the grounding of the transparent electrode, and the touched position is detected.

(bonding layer)

The optical laminated body 100 can contain the bonding layer for bonding two layers together. A bonding layer is a layer comprised from an adhesive or an adhesive agent.

When the bonding layer is a layer composed of an adhesive, the pressure-sensitive adhesive used as the material of the bonding layer can use the above-mentioned pressure-sensitive adhesive composition for pressure-sensitive adhesive layers, and other pressure-sensitive adhesives, for example, different from the material of the above-mentioned pressure-sensitive adhesive layer (meth)acrylic type. A pressure-sensitive adhesive, a styrene-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, an epoxy-based copolymer pressure-sensitive adhesive, and the like can also be used.

As an adhesive agent used as a material of a bonding layer, it can form, for example combining 1 type(s) or 2 or more types among a water-based adhesive agent, an active energy ray hardening-type adhesive agent, etc. Examples of the water-based adhesive include a polyvinyl alcohol-based resin aqueous solution, a water-based two-part type urethane-based emulsion adhesive, and the like. The active energy ray-curable adhesive is an adhesive that is cured by irradiating active energy rays such as ultraviolet rays, for example, an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, a binder resin, and a photoreactive crosslinking agent and adhesives containing As said polymeric compound, photopolymerizable monomers, such as a photocurable epoxy type monomer, a photocurable acrylic type monomer, and a photocurable urethane type monomer, and the oligomer etc. derived from these monomers are mentioned. As said photoinitiator, the compound containing the substance which irradiates active energy rays, such as an ultraviolet-ray, to generate|occur|produce active species, such as a neutral radical, an anion radical, and a cationic radical, is mentioned.

The thickness of the bonding layer is not particularly limited, but when an adhesive layer is used as the bonding layer, it is preferably 10 µm or more, and may be 15 µm or more, or 20 µm or more, and is usually 200 µm or less, and may be 100 µm or less, It may be 50 micrometers or less. When using an adhesive bond layer as a bonding layer, it is preferable that 0.1 micrometer or more may be sufficient as for the thickness of a bonding layer, 0.5 micrometer or more may be sufficient, It is preferable that it is 10 micrometers or less, and 5 micrometers or less may be sufficient as it.

The two opposing surfaces bonded together through a bonding layer may perform corona treatment, a plasma treatment, a flame treatment, etc. beforehand, and may have a primer layer etc.

(Layered Composition of Optical Laminate)

The layer structure of an optical laminated body is demonstrated, referring FIG. The optical laminated body 100a shown in FIG. 4 has the protection film 10, the front plate 20, the bonding layer 50, the colored member 30 which has the colored layer 31, and an adhesive layer ( 51) and the impact resistant film 40 are provided in this order. The image display apparatus 200 shown in FIG. 5 is an optical laminated body 100b in the laminated body in which the image display element (organic electroluminescent panel, etc.) 80 and the back plate 90 were bonded together with the adhesive layer 54. ) are stacked. As for the optical laminated body 100b, the bonding layer 52, the polarizing plate 60, the bonding layer 53, and the touch sensor panel 70 are laminated|stacked on the optical laminated body 100a in this order.

As a specific layer structure of the optical laminated body 100, the following layer structure is mentioned, for example.

(1) Front plate/bonding layer/polarizing plate

(2) Protective film/polarizing plate

(3) Protective film/front plate/bonding layer/polarizing plate

(4) Front plate / Adhesive layer / Colored member / Laminating layer / Polarizing plate

(5) Protective film/coloring member/bonding layer/polarizing plate

(6) Protective film/front plate/adhesive layer/coloring member/bonding layer/polarizing plate

(7) Front plate/bonding layer/coloring member/adhesive layer/polarizing plate

(8) Protective film/coloring member/adhesive layer/polarizing plate

(9) Protective film/front plate/bonding layer/coloring member/adhesive layer/polarizing plate

(10) Front plate/bonding layer/impact resistant film/adhesive layer/coloring member/bonding layer/polarizing plate

(11) Protective film/Impact-resistant film/Adhesive layer/Coloring member/Laminating layer/Polarizing plate

(12) Protective film/front plate/bonding layer/impact resistant film/adhesive layer/coloring member/bonding layer/polarizing plate

(13) Front plate/bonding layer/impact resistant film/bonding layer/coloring member/adhesive layer/polarizing plate

(14) Protective film/impact resistant film/bonding layer/coloring member/adhesive layer/polarizing plate

(15) Protective film/front plate/bonding layer/impact resistant film/bonding layer/coloring member/adhesive layer/polarizing plate

(16) Front plate / Adhesive layer / Colored member / Laminating layer / Impact resistant film / Laminating layer / Polarizing plate

(17) Protection film/coloring member/bonding layer/impact resistant film/bonding layer/polarizing plate

(18) Protective film/front plate/adhesive layer/coloring member/bonding layer/impact resistant film/bonding layer/polarizing plate

(19) Front plate/bonding layer/coloring member/adhesive layer/impact resistant film/bonding layer/polarizing plate

(20) Protective film / Coloring member / Adhesive layer / Impact resistant film / Laminating layer / Polarizing plate

(21) Protective film/front plate/bonding layer/coloring member/adhesive layer/impact resistant film/bonding layer/polarizing plate

(22) Front plate/bonding layer/impact resistant film/adhesive layer/coloring member/bonding layer/polarizing plate

(23) Protective film/Impact-resistant film/Adhesive layer/Coloring member/Laminating layer/Polarizing plate

(24) Protective film/front plate/bonding layer/impact resistant film/adhesive layer/coloring member/bonding layer/polarizing plate

(25) Front plate/bonding layer/impact resistant film/bonding layer/coloring member/adhesive layer/polarizing plate

(26) Protective film/impact resistant film/bonding layer/coloring member/adhesive layer/polarizing plate

(27) Protective film/front plate/bonding layer/impact resistant film/bonding layer/coloring member/adhesive layer/polarizing plate

(28) Front plate/bonding layer/impact resistant film/adhesive layer/coloring member/bonding layer/polarizing plate/bonding layer/touch sensor panel

(29) Protective film/Impact-resistant film/Adhesive layer/Coloring member/Adhesive layer/Polarizing plate/Adhesive layer/Touch sensor panel

(30) Protection film/front plate/bonding layer/impact resistant film/adhesive layer/coloring member/bonding layer/polarizing plate/bonding layer/touch sensor panel

(31) Front plate / bonding layer / impact resistant film / bonding layer / coloring member / adhesive layer / polarizing plate / bonding layer / touch sensor panel

(32) Protection film/impact resistant film/bonding layer/coloring member/adhesive layer/polarizing plate/bonding layer/touch sensor panel

(33) Protective film/front plate/bonding layer/impact resistant film/bonding layer/coloring member/adhesive layer/polarizing plate/bonding layer/touch sensor panel

(34) Front plate/bonding layer/polarizing plate/bonding layer/coloring member/adhesive layer/touch sensor panel

(35) Protective film/polarizing plate/bonding layer/coloring member/adhesive layer/touch sensor panel

(36) Protective film/front plate/bonding layer/polarizing plate/bonding layer/coloring member/adhesive layer/touch sensor panel

(37) Front plate/bonding layer/polarizing plate/adhesive layer/coloring member/bonding layer/touch sensor panel

(38) Protective film/polarizing plate/adhesive layer/coloring member/bonding layer/touch sensor panel

(39) Protection film/front plate/bonding layer/polarizing plate/adhesive layer/coloring member/bonding layer/touch sensor panel

(40) Front plate / bonding layer / impact resistant film / bonding layer / polarizing plate / bonding layer / colored member / adhesive layer / touch sensor panel

(41) Protective film/impact resistant film/bonding layer/polarizing plate/bonding layer/coloring member/adhesive layer/touch sensor panel

(42) Protection film/front plate/bonding layer/impact resistant film/bonding layer/polarizing plate/bonding layer/coloring member/adhesive layer/touch sensor panel

(43) Front plate / bonding layer / impact resistant film / bonding layer / polarizing plate / adhesive layer / colored member / bonding layer / touch sensor panel

(44) Protective film/impact resistant film/bonding layer/polarizing plate/adhesive layer/coloring member/bonding layer/touch sensor panel

(45) Protective film/front plate/bonding layer/impact resistant film/bonding layer/polarizing plate/adhesive layer/coloring member/bonding layer/touch sensor panel

The colored member may have any configuration of a colored layer/separated layer, a protective layer/colored layer/separated layer, a separated layer/colored layer, or a separated layer/colored layer/protective layer.

As shown in FIG. 6, the protection film 10, the front plate 20, the bonding layer 50, the colored member 30 which has the colored layer 31, the adhesive layer 51, the inner When the optical laminate 100a provided with the impact film 40 in this order is bent to a bending radius of 4R, the protection film 10 constituting the outermost surface has at least one end orthogonal to the bending axis. is spaced apart from the front plate 20 together with the pressure-sensitive adhesive layer constituting the protection film.

As shown in FIG. 7, the front plate 20, the bonding layer 50, the colored member 30 which has the colored layer 31, the adhesive layer 51, and the impact-resistant film 40 are this When the optical laminated body 100c provided in this order is bent by the bending radius 4R, as for the front plate 20 which comprises the outermost surface, at least one edge part orthogonal to a bending axis is from the pasting layer 50 are spaced apart

(Manufacturing method of optical laminated body)

The optical laminate 100 is a method including a step of bonding the layers constituting the optical laminate 100 through a pressure-sensitive adhesive layer or a bonding layer using an apparatus such as a known laminator, roll, or cell bonding machine. can be manufactured by When bonding layers through an adhesive layer or a bonding layer, it is preferable to perform surface activation processing, such as a corona treatment, with respect to one or both of bonding surfaces for the purpose of adjusting adhesive force. The conditions of a corona treatment can be set suitably, and conditions may differ from one surface of a bonding surface and another surface.

<Image display device>

The image display device according to the present invention includes the optical laminate 100 . An image display apparatus is not specifically limited, For example, Image display apparatuses, such as an organic electroluminescent display device, an inorganic electroluminescent display, a liquid crystal display device, and an electroluminescent display device, are mentioned. The image display device may have a touch panel function. The optical laminate 100 is suitable for an image display device having flexibility that can be bent or bent. In an image display apparatus, the optical laminated body 100 is arrange|positioned toward the outer side (the side opposite to the image display element side) of the 1st optical member 110a, and is arrange|positioned on the visual recognition side of an image display apparatus. The image display apparatus is bendable with the 1st optical member 110a outward.

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 instruments and instruments, office equipment, medical equipment, computer equipment, and the like. Since the image display apparatus which concerns on this invention has the outstanding flexibility, it is suitable for a flexible display etc.

(Example)

Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these.

[thickness of layer]

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

[Measurement of Peeling Force]

The peeling force was obtained by cutting the optical laminate to a width of 25 mm, obtaining a measurement sample, and using the precision universal testing machine "Autograph AGS-50NX" manufactured by Shimadzu Corporation, the first optical member and the first optical member were adhered to It was calculated|required by holding a layer and measuring the force at the time of peeling in a 180 degree direction. The measurement was performed at a peeling rate of 300 mm/min in an environment of a temperature of 23±2°C and a relative humidity of 50±5%.

[Tensile Modulus]

A rectangular small piece having a long side of 110 mm x a short side of 10 mm was cut out from the optical member using a super cutter, and used as a measurement sample. Next, with the upper and lower chucks of a tensile testing machine (manufactured by Shimadzu Corporation, Autograph AG-Xplus testing machine), the long-side both ends of the sample for measurement are sandwiched so that the chuck spacing is 5 cm, 23°C, 55% relative humidity Under the environment of The tensile modulus of elasticity in was calculated.

[Bending Test]

The presence or absence of generation|occurrence|production of peeling at the time of bending an optical laminated body was measured according to the method shown in FIG. First, the edge part of the test laminated body 400 obtained by bonding the optical laminated body 100 to the plastic plate 300 was bent so that a protection film might become outside. The bend radius was 4R. Next, the vicinity of the center of the test laminate 400 was further bent so that the protection film was outward. The bend radius was 4R. Thereafter, the protection film is peeled off, and at the end of the test laminate 400 (in the portion enclosed by the dotted line, within 6 mm from the end), whether peeling has occurred in the pressure-sensitive adhesive layer adjacent to the colored substrate to be described later. observed whether The presence or absence of generation|occurrence|production of the bubble in the said adhesive layer in the test laminated body 400 was observed after peeling of a protection film.

[Length of separation part]

After bending the optical laminate 100 in the same manner as in the bending test, it was returned to its original state. The length of the spaced part of the 1st optical member 110a which arose in the edge part of the optical laminated body 100 was measured using the ruler. In Examples 1-5, the space|interval of the 1st optical member 110a had arisen in the edge part of the direction orthogonal to a bending axis.

(Preparation of protection film)

In the Example, the protection film was used as a 1st optical member. A protection film in which an acrylic pressure-sensitive adhesive layer was formed on a polyethylene terephthalate (PET) film was prepared. The thickness of the PET film, the thickness of the pressure-sensitive adhesive layer, the peeling force, and the tensile modulus were as shown in Table 1.

(Preparation of the front panel)

A film (manufactured by Toray Industries, Inc.) in which a hard coat layer having a thickness of 10 μm was formed on one side of a PET film having a thickness of 50 μm was prepared as a front plate. The hard-coat layer was a layer formed from the composition containing the dendrimer compound which has a polyfunctional acryl group at the terminal.

(Preparation of colored base material)

A composition for forming an active energy ray-curable colored layer containing carbon black (“CR-BK0951L” manufactured by Samsung SDI) was prepared. An acrylic resin was coated on a glass plate (support) to form a separation layer (thickness: 2 µm). On the separation layer, the colored layer was patterned by a photolithography method to have a thickness of 1.4 µm after drying using the above-mentioned composition for forming a colored layer, and the colored layer was partially formed. Next, on the surface on the side of the formed colored layer, the composition of Example 1 in Japanese Patent Application Laid-Open No. 2016-014877 was coated to form a protective layer (thickness: 1.5 µm). In this way, a colored member having a layer structure of a protective layer/colored layer/separated layer was formed on the support. At the time of preparation of an optical laminated body, the support body was peeled. The photolithography method includes a process for applying a composition for forming a colored layer, an exposure process, a developing process, and a thermosetting process.

(Preparation of impact-resistant film)

A 40-micrometer-thick polyamideimide film was prepared as an impact-resistant film.

(Production of optical laminate)

Protective film/front plate/adhesive layer/colored base material (separation layer/colored layer/protective layer)/adhesive layer/impact resistant film laminated|stacked optical laminated body was produced. The front plate was laminated|stacked so that the hard-coat surface might become the protection film side. The adhesive layer was a layer made of a UV curable adhesive, and had a thickness of 1.5 µm. The pressure-sensitive adhesive layer was an acrylic pressure-sensitive adhesive layer, and had a thickness of 25 µm. This optical laminate was bonded to a plastic plate to obtain a test laminate. The plastic plate had a length b of about 16 cm and a width direction a of about 12 cm. Table 1 shows the results of the bending test of the optical laminate. In Examples 1-5, the edge part of the protection film was spaced apart from the front plate. In Comparative Examples 1 to 3, the protection film was in contact with the front plate over the entire surface.

[Table 1]

100, 100a, 100b, 100c: optical laminate
110a: first optical member
110b: second optical member
120: bonding layer
101: spaced part
102: sticking part
200: image display device
10: protection film
20: front panel
30: colored member
31: colored layer
40: impact resistant film
50, 52, 53, 54: bonding layer
51: adhesive layer
60: polarizer
70: touch sensor panel
80: image display element
90: back plate
300: plastic plate
400: test laminate

Claims (9)

A plurality of optical members are provided,
When bent at a bending radius of 4R, at least one end of the first optical member constituting the outermost surface of the first optical member in a direction orthogonal to the bending axis is adhered to the first optical member. The optical laminate, which is spaced apart from the formed layer. According to claim 1,
The length of the spaced portion is greater than 0 mm and less than or equal to 10 mm, the optical laminate. 3. The method of claim 1 or 2,
The thickness of the said 1st optical member is 55 micrometers or more and 130 micrometers or less, The optical laminated body. 3. The method of claim 1 or 2,
The optical laminated body whose peeling force between the said 1st optical member and the layer affixed to the said 1st optical member is more than 0.5 gf/25 mm and less than 2.0 gf/25 mm. 3. The method of claim 1 or 2,
The said 1st optical member is a film which can peel the whole surface, The optical laminated body. 3. The method of claim 1 or 2,
The optical laminated body whose tensile modulus in the temperature of 23 degreeC of a said 1st optical member is 1000 Mpa or more and 8000 Mpa or less. 3. The method of claim 1 or 2,
The optical laminate further comprising an adhesive layer. A display device comprising the optical laminate according to claim 1 or 2. 9. The method of claim 8,
The display device which is bendable with the said 1st optical member outward.

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