TW202109085A - Optical laminate - Google Patents

Abstract

An optical laminate of the present invention includes a polarizing plate, which is laminated with a polarizing layer and a protecting layer provided on one side or both sides of the polarizing layer and has a hole portion penetrating the polarizing layer and the protective layer in a stacking direction, wherein the hole portion is filled with a translucent filler.

Description

Optical laminate

The present invention relates to an optical laminate including a polarizing plate.

Polarizing plates are widely used as polarized light supply elements and polarized light detection elements in display devices such as liquid crystal display devices and organic electroluminescence (EL) display devices. Conventionally, a polarizing plate is formed by bonding a protective film on one side or both sides of a polarizing element.

Display devices equipped with polarizing plates are also used in portable devices such as notebook personal computers and mobile phones. From the perspective of the requirements for diversification of display purposes, clarification of display distinctions, and decoration, they are required to have different requirements. Polarizing plate for the area of transmittance. Especially in small and medium-sized portable terminals represented by smart phones or tablet terminals, from a decorative point of view, in order to achieve a seamless design covering the entire surface, a polarizing plate is attached The whole way. In this case, since the polarizing plate is also overlapped on the area of the camera lens, or the area where the image (icon) or logo (logo) is printed under the screen, the sensitivity of the camera may deteriorate, or the design may deteriorate. problem.

For this reason, the following processing methods are known: performing processing such as forming holes in the polarizing plate to suppress the decrease in the sensitivity or design of the camera; The polarizing element is chemically treated to form a non-polarizing part so as not to adversely affect the performance of the camera (for example, Patent Documents 1 to 3).

[Prior Technical Literature]

[Patent Literature]

Patent Document 1: Japanese Patent Application Publication No. 2017-194568

Patent Document 2: Japanese Patent Application Publication No. 2018-28563

Patent Document 3: Japanese Patent Application Publication No. 2018-31954

[The problem to be solved by the invention]

The polarizing plate with the hole is bonded to the members constituting the display device through a pressure sensitive adhesive (pressure sensitive adhesive, also known as pressure sensitive adhesive) layer or bonding layer such as an adhesive layer. When a polarizing plate having a hole is attached to the above-mentioned member, defects such as bubbles are generated around the hole that is a cavity, or foreign matter is mixed into the cavity.

The object of the present invention is to provide an optical laminate that can suppress defects such as the generation of bubbles or the incorporation of foreign substances when laminating a polarizing plate on another member.

The present invention provides the following optical laminate.

[1] The optical laminated system includes a polarizing plate, the polarizing plate is laminated with a polarizing layer and a single-sided or double-sided protective layer provided on the polarizing layer, and has a hole that penetrates the polarizing layer and the protective layer in the stacking direction , Wherein the aforementioned hole is filled with a translucent filler.

[2] The optical laminate according to [1], wherein the filler is provided in the entire hole.

[3] The optical laminate according to [1] or [2], wherein the filler system contains a resin.

[4] The optical laminate according to any one of [1] to [3], wherein the thickness of the polarizing plate is 15 μm or more.

[5] The optical laminate according to any one of [1] to [4], wherein the diameter of the hole is 0.5 mm or more and 20 mm or less.

[6] The optical laminate according to any one of [1] to [5], wherein a first adhesive layer is provided on the surface side of one of the polarizing plates.

[7] The optical laminate according to [6], which further has a first release film on the surface side of the first adhesive layer opposite to the polarizing plate.

[8] The optical laminate according to [6], further comprising an image display element layer on the surface side of the first adhesive layer opposite to the polarizing plate.

[9] The optical laminate according to any one of [6] to [8], further comprising a first functional layer between the polarizing plate and the first adhesive layer.

[10] The optical laminate according to [9], wherein the first functional layer includes at least one of an optical film and a touch sensor panel.

[11] The optical laminate according to any one of [6] to [10], which further has a second adhesive layer on the other surface of the aforementioned polarizing plate.

[12] The optical laminate according to [11], wherein the filler is the same adhesive as the adhesive constituting the second adhesive layer.

[13] The optical laminate according to [11] or [12], which further has a second release film on the surface side of the second adhesive layer opposite to the polarizing plate.

[14] The optical laminate according to [11] or [12], which further has a second functional layer on the surface side of the second adhesive layer opposite to the polarizing plate.

[15] The optical laminate according to [14], wherein the second functional layer includes at least one of a touch sensor panel and a cover member.

In addition, in this specification, the layer (first release film or image display element layer) provided on the "surface side of the first adhesive layer opposite to the polarizing plate" includes the case where the first adhesive layer is in direct contact , And also include cases where the first adhesive layer is not directly contacted. The same applies to the layer (the second release film or the second functional layer) provided on the "surface side of the second adhesive layer opposite to the polarizing plate".

In this specification, the so-called layer provided "on the surface" refers to the layer in contact with the surface.

According to the present invention, it is possible to provide an optical laminate that has a structure in which a polarizing plate having a hole is laminated on another member, and the generation of air bubbles and the incorporation of foreign substances are reduced.

1~4,5a,5b,6: optical laminate

10: Polarizing plate

11: Polarizing layer

12: protective layer

12a: The first protective layer

12b: second protective layer

15: Hole

20: Filling material

31: The first adhesive layer

32: The first release film

33: Image display component layer

34: The first functional layer

41: second adhesive layer

42: The second release film

44: The second functional layer

Fig. 1 is a schematic plan view schematically showing an example of the optical laminate of the present invention.

Fig. 2 is an x-x' cross-sectional view of the optical laminate shown in Fig. 1.

Fig. 3 is a schematic plan view schematically showing another example of the optical laminate of the present invention.

Fig. 4 is a schematic plan view schematically showing still another example of the optical laminate of the present invention.

Fig. 5 is a schematic plan view schematically showing still another example of the optical laminate of the present invention.

6(a) and (b) are schematic plan views schematically showing still another example of the optical laminate of the present invention.

Fig. 7 is a schematic plan view schematically showing still another example of the optical laminate of the present invention.

Hereinafter, preferred embodiments of the optical laminate of the present invention will be described with reference to the drawings. In all the following drawings, the scales are adjusted appropriately in order to make it easier to understand each component. The scale of each component shown in the drawings does not necessarily match the scale of the actual component.

(Optical laminate)

Fig. 1 is a schematic plan view schematically showing an example of the optical laminate of the present invention. Fig. 2 is an x-x' cross-sectional view of the optical laminate shown in Fig. 1.

The optical laminate 1 shown in FIGS. 1 and 2 has a polarizing plate 10.

The polarizing plate 10 is laminated with a polarizing layer 11 and a single-sided or double-sided protective layer 12 provided on the polarizing layer 11, and has a hole 15 penetrating the polarizing layer 11 and the protective layer 12 in the stacking direction.

The hole 15 is filled with a translucent filler.

In the optical layered body 1, the polarizing layer 11 is not present in the hole 15 of the polarizing plate 10, and the area where the hole 15 is located may be a non-polarizing area. Therefore, when the optical laminate 1 is applied to a display device such as a liquid crystal display device such as a smartphone or a tablet terminal, or an organic electroluminescence (EL) display device, it can be suppressed in the area where the hole 15 is located. Configure the camera lens, image (icon) or logo (logo) printing section to reduce the sensitivity of the camera or the appearance of the design.

In the optical layered body 1, since the hole 15 of the polarizing plate 10 is filled with the filler 20, the hole 15 can be made solid without voids. Thereby, it is possible to prevent foreign matter from being incorporated into the hole 15 of the polarizing plate 10.

In addition, as will be described later, in a state where one side of the hole 15 of the polarizing plate 10 is blocked, an adhesive sheet or a functional layer (covering member, touch-sensing described later) having an adhesive layer formed on the release film When the measuring panel, optical film, etc.) are laminated on the surface of the polarizing plate 10 located on the other side of the hole 15, it is possible to suppress the incorporation of foreign matter into the hole 15 or the incorporation of air bubbles into the periphery of the hole 15. When the hole 15 is not filled with the filler 20, in order to suppress the incorporation of foreign matter or air bubbles, it is necessary to perform the above-mentioned lamination while performing heat treatment in the vacuum chamber as needed. In contrast, filling the holes 15 with the filler 20 as in the present embodiment makes it easy to suppress the incorporation of foreign substances or bubbles even if the above-mentioned lamination is not performed under vacuum conditions or under vacuum heating conditions.

The shape of the optical layered body 1 in plan view is not particularly limited, but is usually a quadrangular shape as shown in FIG. 1. The quadrangular shape constituting the optical layered body 1 may be a rectangular shape or a square shape, or at least one of the four corners may be rounded (a shape having an R).

The optical laminated body 1 shown in FIG. 1 is a sheet-shaped body, but it may be a long body. The optical laminate 1 can also be cut into a predetermined shape as needed.

The optical laminate 1 may have a protective film on one side or both sides. The pellicle is provided in order to prevent the surface of the polarizing plate 10 from being damaged or contaminated during the manufacture of a product using the optical laminate 1 or during the manufacture or transportation of the optical laminate 1. The pellicle is provided so as to be peelable from the polarizing plate 10.

The protection can be one with an adhesive layer on the base film, or a film with adhesive properties.

As the resin used as the base film of the protective film, the resin used as the protective layer described later can be exemplified, and the adhesive layer can be exemplified by the adhesive described later. The film having adhesiveness itself can be formed using, for example, polypropylene resin and polyethylene resin.

(Polarizer)

As shown in FIG. 2, the polarizing plate 10 has a polarizing layer 11, a first protective layer 12 a and a second protective layer 12 b respectively provided on both sides of the polarizing layer 11.

The first protective layer 12a and the second protective layer 12b may be provided on the polarizing layer 11 by a bonding layer such as an adhesive layer or an adhesive layer, or may be directly provided on the polarizing layer 11 without a bonding layer.

The polarizing plate 10 may be provided with only one of the first protective layer 12a and the second protective layer 12b shown in FIG. 2.

As described above, the polarizing plate 10 has the hole 15 penetrating the polarizing layer 11 and the first protective layer 12a and the second protective layer 12b in the stacking direction. In other words, the polarizing layer 11, the first protective layer 12a, and the second protective layer 12b all have holes extending through the same thickness direction.

Although the plane shape of the hole 15 is not particularly limited, it can be formed into a polygonal shape such as a circle, an ellipse, a coin shape, a triangle, or a quadrangle, and at least one corner of the polygon is rounded (shape having an R). The rounded polygons and so on.

The diameter of the hole 15 is preferably 0.5 mm or more, may be 1 mm or more, may be 2 mm or more, or may be 3 mm or more. The diameter of the hole 15 is preferably 20 mm or less, may be 15 mm or less, may be 10 mm or less, or may be 7 mm or less.

In this specification, the diameter of the hole refers to the diameter of the circle when the shape of the hole in plan view is circular (true circle), and the shape of the hole in plan view is circular (true circle) In other cases, it refers to the diameter of the circle (true circle) outside the hole in a plan view.

The thickness of the polarizing plate 10 is preferably 15 μm or more, more preferably 30 μm or more, and may be 50 μm or more, 60 μm or more, or 80 μm or more. The thickness of the polarizing plate 10 is usually 300 μm or less, may be 250 μm or less, may be 200 μm or less, or may be 150 μm or less.

The hole 15 in the polarizing plate 10 can be formed by punching, cutting, cutting or laser cutting.

The polarizing plate 10 may have one hole 15 or more than two holes 15. When there are two or more holes 15, the shapes or diameters of the holes 15 may be the same or different from each other.

(Polarizing layer)

The polarizing layer 11 is a linear polarizing element having a property of transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis when unpolarized light is incident.

The polarizing layer 11 may include, for example, dyeing treatment, stretching treatment, and crosslinking of polyvinyl alcohol (hereinafter sometimes referred to as "PVA") film with dichroic substances such as iodine or dichroic dyes. Obtained by processing etc.

The polarizing layer 11 may be a cured film obtained by aligning a dichroic dye and a polymerizable liquid crystal compound, and polymerizing the polymerizable liquid crystal compound. Such a polarizing layer 11 can, for example, coat a composition for forming a polarizing element containing a polymerizable liquid crystal compound and a dichroic dye on a substrate film, and polymerize and polymerize the polymerizable liquid crystal compound while keeping the polymerizable liquid crystal compound in a liquid crystal state. Obtained by curing.

The thickness of the polarizing layer 11 may be 40 μm or less, preferably 30 μm or less (for example, 20 μm or less, more preferably 15 μm or less, and still more preferably 10 μm or less or 8 μm or less). The thickness of the polarizing layer 11 is usually 2 μm or more, but may be 5 μm or more.

(The protective layer)

Regarding the protective layer 12 (first protective layer 12a, second protective layer 12b) provided on one side or both sides of the polarizing layer 11, it is not limited as long as it is a light-transmissive resin layer, and it may be resin The film may also be a coating layer formed by coating a resin-containing composition.

As for the resin used in the resin layer, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture resistance, isotropy, and extensibility is preferred. Examples of such thermoplastic resins include: cellulosic resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyether chrysene resins; poly Tungsten resins; polycarbonate resins; polyamide resins such as nylon and aromatic polyamides; polyimide resins; polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers; Cyclic polyolefin-based resins with a norbornene structure; (meth)acrylic resins; polyarylate-based resins; polystyrene-based resins; polyvinyl alcohol-based resins; and mixtures of the foregoing.

When the protective layer 12 is laminated on both sides of the polarizing layer 11, the resin composition of the protective layer 12 may be the same or different from each other.

When the protective layer 12 is a resin film, the protective layer 12 can be provided on the polarizing layer 11 by laminating layers. As the adhesive and adhesive that constitute the bonding layer, the adhesive and adhesive described later can be used.

When the protective layer 12 is a coating layer, it can be formed on the polarizing layer 11 by coating a composition containing the above-mentioned resin.

From the viewpoint of thinning, the thickness of the protective layer 12 is generally 200 μm or less, preferably 150 μm or less, more preferably 100 μm or less, and may be 80 μm or less, or 60 μm or less. The thickness of the protective layer 12 is usually 5 μm or more, may be 10 μm or more, or may be 20 μm or more. The protective layer 12 may or may not have a phase difference.

When the protective layer 12 is laminated on both sides of the polarizing layer 11, the thickness of the protective layer 12 may be the same or different from each other.

(Filling material)

The hole 15 of the polarizing plate 10 is filled with a filler 20. The filling material 20 is usually installed in such a way as to fill the entire hole 15.

The filler 20 has translucency. In this specification, the so-called light transmittance refers to the property that visible light with a wavelength of 400nm to 700nm can penetrate more than 80%. The light transmittance of the filler 20 may be those that can penetrate more than 85% of the visible light in the above-mentioned wavelength region, can also be those that can penetrate more than 90%, or that can penetrate more than 95%.

The filler 20 is not particularly limited as long as it has translucency and can fill the holes 15 of the polarizing plate 10, but preferably contains resin.

Examples of the resin include one or more selected from the group consisting of adhesives, adhesives, and thermoplastic resins.

Adhesives are those that exhibit adhesiveness by adhering themselves to the adherend, and are also called so-called pressure-sensitive adhesives.

As for the adhesive, examples include: (meth)acrylic polymer, silicone-based polymer, polyester-based polymer, polyurethane-based polymer, polyether-based polymer, or rubber-based polymer Such as polymers as the main component. In this specification, the "main component" refers to a component that contains 50% by mass or more in the total solid content of the adhesive. The adhesive can be an active energy ray curable type or a heat curable type, and the degree of crosslinking or bonding strength can be adjusted by irradiating active energy rays or heating.

In this specification, the term "(meth)acrylic acid" means either acrylic acid or methacrylic acid.

From the viewpoint of transparency, adhesive strength, reliability, weather resistance, heat resistance, etc., the adhesive is preferably a (meth)acrylic adhesive. As far as (meth)acrylic adhesives are concerned, the main component system can be used to have methyl, ethyl, n-butyl, isobutyl, or tertiary butyl groups with a carbon number of 20 or less (methyl ) Alkyl acrylate, and functional group-containing (meth)acrylic monomers such as (meth)acrylic acid or hydroxyethyl (meth)acrylate, so that the glass transition temperature is preferably 25°C or less, more preferably The (meth)acrylic polymer having a weight average molecular weight of 100,000 or more is obtained by blending so as to be 0°C or less.

The adhesive is one containing a curable resin component (so-called curable resin), and is an adhesive other than a pressure-sensitive adhesive (adhesive).

Examples of adhesives include: water-based adhesives obtained by dissolving or dispersing curable resin components in water, active energy ray curable adhesives containing active energy ray curable compounds, thermosetting adhesives, etc. .

Examples of resin components contained in the water-based adhesive include polyvinyl alcohol-based resins, polyurethane resins, and the like.

Examples of the active energy ray curable adhesive include compositions that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron rays, and X-rays. The composition cured by the irradiation of active energy rays is preferably an ultraviolet curable composition, and it is more preferable to contain an epoxy-based compound that is cured by cationic polymerization as the curable component.

Examples of thermosetting adhesives include epoxy resins, silicone resins, phenol resins, melamine resins, and the like as main components.

Examples of thermoplastic resins include polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.), cyclic polyolefin resins (norbornene resins, etc.); triacetyl cellulose, diacetyl fiber Cellulose ester resins such as cellulose; polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polycarbonate resins; (meth)acrylic acid Resins; polystyrene resins, etc. The thermoplastic resin may be, for example, a filament-like thermoplastic resin used in 3D printing.

Inject the above-mentioned adhesive, adhesive, or thermoplastic resin into the hole 15 of the polarizing plate 10 in a fluid state, such as liquid, fine particle, or powder, and dry it as needed after injecting it. Or solidification, melting and solidification in the form of particles or powder, etc., whereby the above-mentioned filler 20 can be filled in the hole 15.

Alternatively, the above-mentioned adhesive, adhesive, or thermoplastic resin may be preformed into a molded article that is molded in accordance with the shape of the hole 15 and the hole 15 of the polarizing plate 10 is fitted into the molded article, thereby The filler 20 described above is filled. In this case, it is preferable to form the molded product with The hole 15 has the same size or a size smaller than the size of the hole 15 by 0 mm or more and 0.2 mm or less.

(Other examples of optical laminate [1])

Fig. 3 is a schematic plan view schematically showing another example of the optical laminate of the present invention.

The optical laminate 2 shown in FIG. 3 further has a first adhesive layer 31 and a first release film 32 on the surface side of one of the optical laminates 1 shown in FIG. 2 in this order.

The first adhesive layer 31 may be provided on the second protective layer 12b of the polarizing plate 10 as shown in FIG. 3, or may be provided on the first protective layer 12a.

When the polarizing plate 10 has the protective layer 12 on only one side, the first adhesive layer 31 and the first peeling film 32 may be sequentially disposed on the protective layer 12 or the polarizing layer 11.

As shown in FIG. 3, the first adhesive layer 31 can be provided in direct contact with the polarizing plate 10, or it can be provided in direct contact with the first functional layer (optical layer) provided as the protective layer of the polarizing plate 10 as described later. Film, touch sensor panel, etc.).

The first adhesive layer 31 can be used as a bonding layer for bonding with the image display element layer described later.

The first adhesive layer 31 may have a hole portion penetrating along the stacking direction of the layer in the region where the hole portion 15 of the polarizing plate 10 is located. In this case, it is preferable that in the optical layered body 2, the holes of the first adhesive layer 31 are filled with the filler 20. In the optical layered body 2, the adhesive constituting the first adhesive layer 31 can also be used as the filler 20 for filling the holes 15 of the polarizing plate 10.

The first release film 32 can be used to coat and protect the surface of the first adhesive layer 31 on the side opposite to the polarizing plate 10 side. The first release film 32 is peelable from the first adhesive layer 31.

The first release film 32 does not have a hole in the region where the hole 15 of the polarizing plate 10 is located.

In the optical laminate 2, when the polarizing plate 10 has a protective layer on only one side, it is preferable to have a protective layer on the side where the first adhesive layer 31 is not provided (the first protective layer 12a in FIG. 3).

The optical layered body 2 does not need to have the first release film 32.

The optical laminate 2 can be formed by laminating a first adhesive sheet having a first adhesive layer 31 on the first release film 32 on the above-mentioned polarizing plate 10, and then filling the hole 15 with a filler 20. obtain.

The optical layered body 2 can also be obtained by laminating the first adhesive sheet on a polarizing plate in which the hole 15 is not formed, forming only the hole 15 in the polarizing plate, and filling the hole 15 with a filler 20.

The optical laminate 2 can also be obtained by laminating the first adhesive sheet on the optical laminate 1 (FIG. 2 ).

The optical laminate 2 can also be obtained by the following steps. First, the adhesive sheet provided with the first adhesive layer 31 on the release film is laminated on the polarizing plate in which the hole 15 is not formed to obtain a laminate (1). Next, in order to form the hole 15 of the polarizing plate 10, after forming the hole penetrating the entire laminate (1) in the layering direction, the release film is peeled off, and the first release film 32 is laminated to be exposed by the peeling On the first adhesive layer 31, thereby obtaining a laminate (2). Furthermore, the hole part of the laminated body (2) is filled with the filler 20, and the optical laminated body 2 is obtained by this.

The optical laminate 2 can also be obtained by the following steps. First, a protective film is laminated on the first protective layer 12a side of the polarizing plate 10 having the hole 15 not filled with the filler. Then, the material of the filler 20 is injected into the hole 15 and then used to form the first The adhesive of the adhesive layer 31 is coated on the surface of the polarizing plate 10 on the side opposite to the protective layer. After that, the applied adhesive and the material of the filler 20 are heated at the same time, thereby curing the adhesive and the like. By curing in this way, a first adhesive layer 31 is formed on the surface of the polarizing plate 10 opposite to the protective film, and a first release film 32 is formed on the surface of the first adhesive layer 31 opposite to the polarizing plate 10. The protective film laminated on the polarizing plate 10 can be peeled off and removed as needed.

When the material constituting the filler 20 is an adhesive, injecting the adhesive into the hole of the polarizing plate and applying the adhesive to the polarizing plate may be performed at the same time.

The first adhesive layer 31 is formed using an adhesive, and the above-mentioned materials can be used as the adhesive.

The thickness of the first adhesive layer 31 is not particularly limited, and may be 10 μm or more, 15 μm or more, or 20 μm or more. The thickness of the first adhesive layer 31 is usually 50 μm or less, may be 40 μm or less, may be 30 μm or less, or may be 25 μm or less.

As the first release film 32, for example, a resin film obtained by subjecting the side in contact with the first adhesive layer 31 to a mold release treatment can be used.

Examples of the resin film include films composed of polyethylene resins such as polyethylene, polypropylene resins such as polypropylene, and polyester resins such as polyethylene terephthalate.

As the mold release treatment, silicone coating and the like can be cited.

The thickness of the first release film 32 is not particularly limited, and may be 20 μm or more, or 25 μm or more, and is usually 50 μm or less, may be 40 μm or less, or may be 30 μm or less.

As the release film, those exemplified by the first release film 32 can be used.

(Other examples of optical laminates[2])

Fig. 4 is a schematic plan view schematically showing still another example of the optical laminate of the present invention.

The optical laminate 3 shown in FIG. 4 is on the first protective layer 12a (the other side of the polarizing plate 10) of the optical laminate 2 shown in FIG.膜42. The second adhesive layer 41 is provided so as to directly contact the polarizing plate 10 of the optical laminate 2.

The second adhesive layer 41 can be used as a bonding layer for bonding with the second functional layer (cover member, touch sensor panel, etc.) described later.

The second release film 42 can be used to coat and protect the surface of the second adhesive layer 41 on the side opposite to the polarizing plate 10 side. The second release film 42 is peelable from the second adhesive layer 41.

The optical layered body 3 does not need to have the second release film 42.

In the optical laminate 3 shown in FIG. 4, since the filler 20 is provided in the hole 15 of the polarizing plate 10, it is possible to suppress the second adhesion when placed in a high temperature environment (for example, 85°C for 100 hours). Defects such as peeling of the agent layer 41 and light leakage.

In the optical layered body 3, the filler 20 is preferably the same adhesive as the adhesive constituting the second adhesive layer 41. By setting the adhesive constituting the filler 20 to the same material as the adhesive constituting the first adhesive layer 31, the optical laminate 3 can be efficiently manufactured. Thereby, when the optical laminate 3 is applied to a display device, the sensitivity of the camera can be suppressed in the area where the above-mentioned hole 15 is located, and when a camera lens, or a printing portion such as an icon or logo is arranged, Problems such as deterioration, or deterioration of appearance design.

The optical layered body 3 can be obtained, for example, by laminating a second adhesive sheet having a second adhesive layer 41 on the second release film 42 on the polarizing plate 10 of the optical layered body 2.

Since the optical laminate 2 (FIG. 3) is used for the lamination with the second adhesive sheet, it is possible to prevent foreign matter from being incorporated into the holes 15 or air bubbles into the holes 15 when the optical laminate 2 and the second adhesive sheet are laminated. The surrounding situation.

In particular, in the optical laminate 2, since the first adhesive layer 31 and the first release film 32 are provided, one side of the hole 15 is blocked by the first adhesive layer 31 or the first release film 32. Therefore, when laminating the optical layered body 2 having the cavity portion with the second adhesive sheet, the second adhesive sheet must be laminated with the second adhesive sheet under vacuum conditions or under vacuum heating conditions to prevent foreign matter from being incorporated into the holes. Or bubbles are generated around the hole. On the other hand, when the optical laminate 2 and the second adhesive sheet in which the holes are filled with the filler 20 are laminated, even if they are not laminated under vacuum conditions or under vacuum heating conditions, the incorporation of foreign matter and bubbles can be suppressed. . However, in order to further suppress the incorporation of foreign matter or bubbles into the bonding surface of the optical laminate 2 and the second adhesive sheet, the optical laminate 2 and the second adhesive sheet may be laminated under vacuum conditions or under vacuum heating conditions.

When the optical layered body 3 is a long body, the layering of the optical layered body 2 (FIG. 3) and the second adhesive sheet is usually performed continuously. In the case of using an optical laminate with holes with voids, compared with the case of using an optical laminate with no holes, it is necessary to slow down the speed of laminating the second adhesive sheet so as to suppress the above-mentioned foreign matter or bubbles. The incorporation.

By using the optical laminate 2 in which the holes are filled with the filler 20, the optical laminate 2 and the second adhesive sheet can be laminated at the same speed as in the case of using the optical laminate without holes.

The second adhesive layer 41 can be formed using an adhesive. As far as the adhesive is concerned, the above-mentioned materials can be used.

In the optical laminate 3, when the filler 20 and the adhesive constituting the second adhesive layer 41 are the same adhesive, the laminate of the optical laminate 2 (FIG. 3) and the second adhesive sheet is preferably heated under heating conditions (For example, at a temperature of 50°C to 70°C). By bonding under heating conditions, the adhesive constituting the second adhesive layer 41 and the adhesive constituting the filler 20 are easily assimilated (integrated). Thereby, since the boundary between the second adhesive layer 41 and the filler 20 can be made difficult to distinguish, it is possible to suppress the change in the refractive index of the portion where the filler 20 and the second adhesive layer 41 are in contact.

The optical laminate 3 can also be obtained by the following steps.

First, the first adhesive sheet obtained by providing the first adhesive layer 31 on the first release film 32 is laminated on the polarizing plate 10 having the hollow portion 15. Next, the material of the filler 20 is injected to fill the hole 15 of the polarizing plate 10, and then the adhesive used to form the second adhesive layer 41 is coated on the side of the polarizing plate 10 opposite to the first adhesive sheet The surface side. Then, the applied adhesive and the material of the filler 20 are heated and cured at the same time. By this curing, the second adhesive layer 41 is formed on the surface side of the polarizing plate 10 opposite to the first adhesive sheet, and the second release film 42 is laminated on the second adhesive layer 41 opposite to the polarizing plate 10之surface side.

When the material constituting the filler 20 is an adhesive, injecting the adhesive into the holes of the polarizing plate and applying the adhesive for forming the second adhesive layer 41 may be performed at the same time.

The optical laminate 3 can also be obtained by the following steps.

First, the second adhesive sheet, which is provided with the second adhesive layer 41 on the second release film 42, is laminated on the polarizing plate 10 having the hollow portion 15. Next, the material of the filler 20 is injected by filling the hole 15 of the polarizing plate 10, and then the adhesive used to form the first adhesive layer 31 is coated on the opposite side of the polarizing plate 10 to the second adhesive sheet The surface side. Then, by adding The applied adhesive is heated at the same time as the material of the filler 20 to be cured. By this curing, the first adhesive layer 31 is formed on the surface side of the polarizing plate 10 opposite to the second adhesive sheet, and the first release film 32 is laminated on the first adhesive layer 31 opposite to the polarizing plate 10之surface side.

When the material constituting the filler 20 is an adhesive, injecting the adhesive into the holes of the polarizing plate and applying the adhesive for forming the first adhesive layer 31 may be performed at the same time.

The thickness of the second adhesive layer 41 is not particularly limited, and may be 80 μm or more, 100 μm or more, or 120 μm or more. The thickness of the second adhesive layer 41 is generally 200 μm or less, may be 180 μm or less, or may be 150 μm or less.

As the second release film 42, for example, a resin film obtained by subjecting the side in contact with the second adhesive layer 41 to a mold release treatment can be used.

As the resin film and mold release treatment, for example, those exemplified by the first release film 32 can be used.

The thickness of the second release film 42 is not particularly limited, and may be 20 μm or more, or 30 μm or more, and is usually 100 μm or less, may be 80 μm or less, or may be 60 μm or less.

(Other examples of optical laminates[3])

Fig. 5 is a schematic plan view schematically showing still another example of the optical laminate of the present invention.

The optical layered body 4 shown in FIG. 5 is an optical layered body having the same layered structure as the layered body after peeling the first release film 32 from the optical layered body 3 shown in FIG. 4 with an image layered on the first adhesive layer 31 The display element layer 33 is formed.

The optical layered body does not need to have the second release film 42.

The image display element layer 33 includes a liquid crystal display element such as a liquid crystal panel included in a liquid crystal display device, or an organic electroluminescence (EL) element included in an organic electroluminescence (EL) display device.

The optical laminate 4 can be obtained, for example, by peeling the first release film 32 from the optical laminate 3 (FIG. 4 ), and bonding the exposed first adhesive layer 31 and the image display element layer 33 together.

The optical laminate 4 can also be obtained by the following steps.

First, after laminating the first adhesive sheet having the first adhesive layer 31 on the first release film 32 on the polarizing plate 10 having the hollow portion 15, the first release film 32 is peeled off. After the first adhesive layer 31 exposed by peeling off the first release film 32 and the image display element layer 33 are bonded, the hole 15 is filled with the filler 20, and the second release film 42 is provided with a second The second adhesive sheet obtained by the adhesive layer 41 is laminated on the surface of the polarizing plate on the opposite side to the first adhesive layer 31 to obtain the optical laminate 4.

(Other examples of optical laminates[4])

6(a) and (b) are schematic plan views schematically showing still another example of the optical laminate of the present invention.

The optical laminates 5a, 5b shown in FIGS. 6(a) and (b) are based on the optical laminate 3 shown in FIG. 4, and include a first functional layer between the polarizing plate 10 and the first adhesive layer 31 34. Specifically, the optical laminates 5a, 5b are on the side of the first protective layer 12a of the optical laminate 1 shown in FIG. The second protective layer 12b side of 1 has a first functional layer 34, a first adhesive layer 31, and a first release film 32 in this order.

In the optical laminates 5a and 5b, when the polarizing plate 10 has a protective layer on only one side, it is preferable to have a protective layer on the side where the second adhesive layer 41 is provided (the first protective layer 12a in FIG. 3).

The optical layered bodies 5a and 5b may not have the first release film 32.

The optical laminates 5 a and 5 b may also have an image display element layer on the first adhesive layer 31 instead of the first release film 32.

The optical layered bodies 5a and 5b may not have the second release film 42.

A bonding layer may be provided between the optical laminate 1 and the first functional layer 34. The bonding layer is an adhesive layer formed of an adhesive or an adhesive layer formed of an adhesive. The above-mentioned materials can be mentioned as an adhesive agent and an adhesive agent which comprise a bonding layer.

As the first functional layer 34, at least one of an optical film and a touch sensor panel can be cited. When the first functional layer 34 includes both an optical film and a touch sensor panel, it is preferable to have an optical film and a touch sensor panel in order from the side of the polarizing plate 10. In addition to the first functional layer 34, the optical layered bodies 5a and 5b may have a hard coat layer. In addition, the first functional layer 34 included in the optical layered bodies 5a and 5b may have a structure in which two or more optical films are laminated.

When an optical film is provided as the first functional layer 34, the optical film may also have a hole in the region where the hole 15 of the polarizing plate 10 is located. In this case, as shown in FIG. 6(b), in the optical laminate 5b, it is preferable that the filler 20 is also provided in the hole of the optical film (the first functional layer 34).

In the optical laminates 5a and 5b shown in Figs. 6(a) and 6(b), since the hole 15 of the polarizing plate 10 is filled with the filler 20, it is possible to suppress exposure to a high temperature environment (for example, a temperature of 85°C, 100°C). Hours) when left to stand, etc., the second adhesive layer 41 is peeled off or light leaks.

The optical laminate 5a shown in FIG. 6(a) can be obtained according to the following steps.

A first functional layer 34 is provided on the polarizing plate 10 with a hollow hole 15, and a first adhesive sheet formed by providing a first adhesive layer 31 on the first release film 32 is laminated on the first functional layer 34. After that, the above-mentioned hole 15 is filled with a filler 20, thereby obtaining a laminate (3). Next, the second adhesive sheet formed by providing the second adhesive layer 41 on the second release film 42 is laminated on the polarizing plate 10 of the laminate (3), thereby obtaining the optical laminate 5a.

In the laminate (3), the first functional layer 34 may be provided on the optical laminate 1 (FIG. 2), and the first adhesive sheet may be laminated on the first functional layer 34 in the obtained laminate (3). On the way.

The optical laminate 5b shown in FIG. 6(b) can be obtained according to the following steps.

First, a first functional layer 34 is provided on a polarizing plate having a protective layer 12 on one or both sides of the polarizing layer 11 to obtain a laminate (4).

Furthermore, the holes are formed so as to penetrate the entire laminate (4) in the laminate direction,

The first adhesive sheet formed by providing the first adhesive layer 31 on the first release film 32 is laminated to obtain a laminate (5). After placing the filler 20 in the hole of the laminate (5), the second adhesive sheet is laminated on the surface of the polarizing plate 10 opposite to the first adhesive layer 31, thereby obtaining the optical laminate 5b.

When the optical layered body 5b is manufactured by the above-mentioned steps, a hole is also formed in the first functional layer 34, and the hole is also filled with the filler 20.

When the first adhesive layer 31 is also provided with holes, the laminate (5) can be obtained according to the following steps. A laminate obtained by laminating an adhesive sheet formed by providing the first adhesive layer 31 on the release film on the first functional layer 34 of the laminate (4) was obtained.

Next, a hole is formed so as to penetrate the entire laminate, and after the release film is peeled off, the first release film 32 is laminated, whereby a laminate (5) can be obtained.

The lamination of the second adhesive sheet can also be carried out under vacuum conditions. When the filler 20 of the optical layered bodies 5a and 5b is the same adhesive as the adhesive constituting the second adhesive layer 41, it is preferably performed under heating conditions (for example, at a temperature of 50°C to 70°C).

As described above, by laminating the second adhesive sheet in a state where the hole 15 of the polarizing plate 10 is filled with the filler 20, it is possible to suppress the incorporation of foreign matter into the hole 15 or the incorporation of air bubbles into the periphery of the hole 15 Situation.

Examples of optical films include retardation films (cured films obtained by aligning and polymerizing resin films or polymerizable liquid crystal compounds), reflective films, semi-transmissive reflective films, brightness enhancement films, optical compensation films, and anti-corrosion films. Film with glare function, etc. The optical film may be one layer or two or more layers. When there are two or more layers, the optical films may be the same or different from each other.

The optical film may be a λ/4 wavelength plate, a laminated film of a λ/4 wavelength plate and a λ/2 wavelength plate, a reverse wavelength dispersion λ/4 wavelength plate and a positive C plate laminated film. When the optical film is a laminated film, a bonding layer (adhesive layer or adhesive layer) may be interposed between the film and the film.

The touch sensor panel is a sensor that can detect the position touched by a finger or a stylus. The detection method of the touch sensor panel is not particularly limited, and can be exemplified as touch sensor panels such as a resistive film method, an electrostatic capacitance coupling method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, and a surface acoustic wave method. From the viewpoint of low cost, touch sensor panels of resistive film method and electrostatic capacitance coupling method are more suitable.

Examples of the hard coat layer include layers made of resins such as triacetyl cellulose and acrylic resin.

(Other examples of optical laminates[5])

Fig. 7 is a schematic plan view schematically showing still another example of the optical laminate of the present invention.

The optical laminate 6 shown in FIG. 7 is laminated with the second functional layer 44 on the second adhesive layer 41 of the optical laminate obtained by peeling off the second release film 42 from the optical laminate 3 shown in FIG. 4 And the winner.

The optical layered body 6 may not have the first release film 32.

The optical laminate 6 may also have an image display element layer on the first adhesive layer 31 instead of the first release film 32.

As the second functional layer 44, at least one of a covering member and a touch sensor panel can be cited. When the second functional layer 44 includes both the cover member and the touch sensor panel, it is preferable to have the touch sensor panel and the cover member in order from the second adhesive layer 41 side.

The optical laminate 6 can be obtained by laminating the second functional layer 44 on the second adhesive layer 41 exposed after the second release film 42 of the optical laminate 3 shown in FIG. 4 is peeled off.

The covering member can be used as a member constituting the outermost surface of a display device or the like. The covering member is a translucent (preferably optically transparent) plate-shaped body. The covering member may have a single-layer structure or a multilayer structure.

The covering member is preferably composed of an inorganic material such as glass or strengthened glass, and a resin film having a Young's modulus of 2 Gpa or more. Inorganic materials such as glass or tempered glass are particularly suitable for flexible displays in order to achieve flexibility. Among them, preferred are: polyimide film, polyimide imide film, polyimide film, polyester-based film, olefin-based film, acrylic Membrane, cellulose membrane. It is also good to disperse inorganic particles such as silica, organic particles, rubber particles, etc. in the polymer film.

The bendable covering member composed of a resin film may have a hard coat on at least one side. The hard coat layer can be provided on the surface of the resin film by a conventional method.

As a touch sensor panel, the above-mentioned materials can be mentioned.

(Use of optical laminate)

The optical laminates 1 to 4, 5a, 5b, and 6 can be used in display devices such as liquid crystal display devices or organic electroluminescence (EL) display devices. Examples of display devices include portable devices such as smartphones and tablet computers, televisions, digital photo frames, electronic signage, measuring instruments or instruments, office equipment, medical equipment, and computer equipment.

In the optical laminates 5a, 5b, and 6, when the laminate member is a touch sensor panel, it can be used in a touch panel display device such as a smart phone or a tablet computer.

1: Optical laminate

10: Polarizing plate

11: Polarizing layer

12: protective layer

12a: The first protective layer

12b: second protective layer

15: Hole

20: Filling material

Claims (15)

An optical laminated body comprising a polarizing plate, the polarizing plate is laminated with a polarizing layer and a single-sided or double-sided protective layer provided on the polarizing layer, and having holes penetrating the polarizing layer and the protective layer in the stacking direction ,among them, The aforementioned hole is filled with a translucent filler. The optical laminate according to claim 1, wherein the filler is provided in the entire hole. The optical laminate according to claim 1 or 2, wherein the filler system contains a resin. The optical laminate according to any one of claims 1 to 3, wherein the thickness of the polarizing plate is 15 μm or more. The optical laminate according to any one of claims 1 to 4, wherein the diameter of the hole is 0.5 mm or more and 20 mm or less. The optical layered body according to any one of claims 1 to 5, wherein a first adhesive layer is provided on the surface side of one of the polarizing plates. The optical laminate according to claim 6, which further has a first release film on the surface side of the first adhesive layer opposite to the polarizing plate. The optical laminate according to claim 6, further comprising an image display element layer on the surface side of the first adhesive layer opposite to the polarizing plate. The optical laminate according to any one of claims 6 to 8, further comprising a first functional layer between the polarizing plate and the first adhesive layer. The optical laminate according to claim 9, wherein the first functional layer system includes at least one of an optical film and a touch sensor panel. The optical laminate according to any one of claims 6 to 10, which further has a second adhesive layer on the other surface of the aforementioned polarizing plate. The optical laminate according to claim 11, wherein the filler is the same adhesive as the adhesive constituting the second adhesive layer. The optical laminate according to claim 11 or 12, which further has a second release film on the surface side of the second adhesive layer opposite to the polarizing plate. The optical laminate according to claim 11 or 12, which further has a second functional layer on the surface side of the second adhesive layer opposite to the polarizing plate. The optical laminate according to claim 14, wherein the second functional layer includes at least one of a touch sensor panel and a covering member.

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