TW202136039A - Laminate sheet and method for manufacturing same - Google Patents

Abstract

According to the present invention, a laminate sheet having a front surface plate and a polarization layer is manufactured by being cut by laser from an elongated laminate into a sheet body having a predetermined shape. The purpose of the present invention is to provide a laminate sheet, the suction force of which is hardly degraded when a surface protective film is peeled from the laminate sheet having a front surface plate and a polarization layer. The front surface plate, the polarization layer, a first adhesive layer, and a first resin film are laminated in this order, the first resin film can be peeled from the first adhesive layer, and the heights of burrs in the outer peripheral edge section of the first resin film are no greater than 6.0 [mu]m.

Description

Laminated sheet and its manufacturing method

The present invention relates to a laminated sheet and a manufacturing method thereof.

The laminated sheet including the front surface plate and the polarizing layer is attached to the display panel via the adhesive layer formed on the polarizing layer side to form a display device. Before lamination of the laminated sheet, in order to prevent its surface from being contaminated or damaged, a separate film (Separate Film) is laminated on the adhesive layer, and a surface protective film is laminated on the front surface plate. When laminating a resin film including a colored layer on the front surface plate or replacing the surface protection film, first adsorb and hold the separation membrane side. Then, the surface protective film on the front surface plate is peeled off to expose the front surface plate, and a resin film including a colored layer is laminated, or the surface protective film is replaced.

The laminated sheet including the front surface plate and the polarizing layer is manufactured by cutting a long laminated body into a single piece of a predetermined shape by laser. Especially in the case where the laminate sheet has a layer formed by curing a polymerizable liquid crystal compound, it is difficult to produce micro cracks (for example, the length of which is 200 μm or less) at the end of the laminate sheet. The cutting of shots is better than cutting with knives. In the case where the display device can be bent, if there are minute cracks at the end of the laminate sheet, the laminate sheet may break due to the minute cracks during bending. Therefore, it is desirable to cut the laminate sheet by laser. [Prior Art Literature] [Patent Literature]

[Patent Document 1] WO2016/158300

[The problem to be solved by the invention]

It has been clarified that after cutting with a laser, burrs will be generated on the outer peripheral edge of the laminated sheet surface. When the burr peels off the surface protection film from the laminate sheet, it reduces the force of adsorbing the separation membrane and causes a problem that the laminate sheet cannot be retained. The object of the present invention is to provide a laminated sheet whose adsorption force is not easily reduced when the surface protective film is peeled from the laminated sheet. [Means to solve the problem]

[1] A laminated sheet in which a polarizing layer, a first adhesive layer, and a first resin film are sequentially laminated, and The first resin film can be peeled from the first adhesive layer, The height of the burr on the outer peripheral edge of the first resin film is 6.0 μm or less. [2] A laminated sheet in which a front surface plate, a polarizing layer, a first adhesive layer, and a first resin film are sequentially laminated, and The first resin film can be peeled from the first adhesive layer, The height of the burr on the outer peripheral edge of the first resin film is 6.0 μm or less. [3] The laminated sheet according to [1] or [2], wherein the height of the burr is 0.1 μm or more. [4] The laminated sheet according to any one of [1] to [3], wherein the polarizing layer has a layer formed by curing a polymerizable liquid crystal compound. [5] A method of manufacturing a laminated sheet, comprising: a preparation step of preparing a laminated body, in the laminated body, A polarizing layer, a first adhesive layer, a first resin film, and a second protective film are laminated in sequence, The second protective film has a second adhesive layer on one side of the second resin film, The second protective film is laminated on the first resin film via the second adhesive layer, The first resin film can be peeled from the first adhesive layer, The second protective film can be peeled from the first resin film; and In the cutting step, the laminated body is irradiated with laser light from the polarizing layer side to cut the laminated body into a predetermined shape to obtain a laminated sheet. [6] A method of manufacturing a laminated sheet, including a preparation step of preparing a laminated body, in the laminated body, The front surface plate, the polarizing layer, the first adhesive layer, the first resin film, and the second protective film are laminated in sequence, The second protective film has a second adhesive layer on one side of the second resin film, The second protective film is laminated on the first resin film via the second adhesive layer, The first resin film can be peeled from the first adhesive layer, The second protective film can be peeled from the first resin film; and In the cutting step, laser light is irradiated to the laminated body from the front surface plate side to cut the laminated body into a predetermined shape to obtain a laminated sheet. [7] The method of manufacturing a laminated sheet according to [5] or [6], wherein in the cutting step, the output of the laser light is 50 W or more and 200 W or less. [8] The method of manufacturing a laminated sheet according to any one of [5] to [7], wherein in the cutting step, the laminated body is cut into a predetermined shape by full cut . [9] The manufacturing method of the laminated sheet according to any one of [5] to [8], wherein the thickness of the second resin film is 40 μm or more. [10] The method for producing a laminated sheet according to any one of [5] to [9], wherein the polarizing layer has a layer formed by curing a polymerizable liquid crystal compound. [Effects of the invention]

According to the present invention, it is possible to provide a laminate sheet in which the adsorption force is not easily reduced when the surface protective film is peeled from the laminate sheet.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the following drawings, the scales are appropriately adjusted to make the constituent elements easy to understand, and the scales of the respective constituent elements shown in the drawings may not necessarily match the scales of the actual constituent elements.

＜Laminates＞ Fig. 1 is a schematic cross-sectional view showing an example of the laminated sheet of the present invention. The laminated sheet 300 shown in FIG. 1 has a front surface plate 1, a polarizing layer 2, a first adhesive layer 102, and a first resin film 101 laminated in this order. The front surface plate 1 and the polarizing layer 2 are bonded by the bonding layer 3. The polarizing layer 2 has a linear polarizing plate 20 and a retardation film 22 from the front surface plate 1 side. The first adhesive layer 102 may be an adhesive layer for attaching the laminated sheet to the display panel. The first resin film 101 corresponds to a so-called separation membrane. The first resin film 101 can be peeled off from the first adhesive layer 102, and the surface of the first resin film 101 can be released from the first adhesive layer 102 so that it can be peeled off from the first adhesive layer 102.

Fig. 4 is a schematic cross-sectional view showing an example of the laminated sheet of the present invention. The laminated sheet 302 shown in FIG. 4 has a polarizing layer 2, a first adhesive layer 102, and a first resin film 101 laminated in this order. The polarizing layer 2 has a retardation film 22 and a linear polarizing plate 20 from the side of the first resin film 101. The first adhesive layer 102 may be an adhesive layer for attaching the laminated sheet to the display panel. The first resin film 101 corresponds to a so-called separation membrane. The first resin film 101 can be peeled off from the first adhesive layer 102, and the surface of the first resin film 101 can be released from the first adhesive layer 102 so that it can be peeled off from the first adhesive layer 102.

The laminated sheet may include the third protective film on the side opposite to the polarizing layer side in the front surface plate, or on the side opposite to the first resin film side in the polarizing layer. 2 and 5 are schematic cross-sectional views showing an example of the laminated sheet of the present invention. The laminated sheet 301 shown in FIG. 2 has a third protective film 5, a front surface plate 1, a polarizing layer 2, a first adhesive layer 102, and a first resin film 101 laminated in this order. The front surface plate 1 and the polarizing layer 2 are bonded by the bonding layer 3. The polarizing layer 2 has a linear polarizing plate 20 and a retardation film 22 from the front surface plate 1 side. The third protective film 5 corresponds to a so-called surface protective film, and has a third adhesive layer 50 on one surface of the third resin film 51. The third protective film 5 is laminated on the front surface plate 1 via the third adhesive layer 50. The third protective film 5 can be peeled off from the front surface plate 1, and the third adhesive layer 50 can adjust its adhesive force so that it can be peeled off from the front surface plate 1.

The laminated sheet 303 shown in FIG. 5 has a third protective film 5, a polarizing layer 2, a first adhesive layer 102, and a first resin film 101 laminated in this order. The polarizing layer 2 has a retardation film 22 and a linear polarizing plate 20 from the side of the first resin film 101. The third protective film 5 corresponds to a so-called surface protective film, and has a third adhesive layer 50 on one surface of the third resin film 51. The third protective film 5 is laminated on the polarizing layer 2 via the third adhesive layer 50. The third protective film 5 can be peeled off from the polarizing layer 2, and the third adhesive layer 50 can adjust its adhesive force in such a way that it can be peeled off from the polarizing layer 2.

The laminated sheet may include layers other than those shown in FIGS. 1 to 2 and 4 to 5. The laminated sheet may include, for example, a touch sensor layer, an impact-resistant film arranged between the front surface plate 1 and the polarizing layer 2, a resin film, and the like.

In the laminated sheet of the present invention, the height of the burr at the outer peripheral edge of the first resin film is 6.0 μm or less. The burrs may be residues on the outside of the geometric shape on the corner edges of the laminate, and may be residues on the laminate after a machining or forming step. Specifically, the burr may be formed by melting and solidifying the material (especially the material of the first resin film) that is present on the surface of the first resin film on the side opposite to the first adhesive layer side and the outer peripheral edge portion and the material constituting the laminated sheet (especially the material of the first resin film) By. Burrs can be produced by laser processing. The burr may exist in at least a part of the entire circumference of the outer peripheral edge portion of the first protective film in a plan view, or may exist in the entire circumference of the outer peripheral edge portion.

In FIG. 1, the burr 40 exists on the outer peripheral edge part of the surface of the 1st resin film 101 on the opposite side to the side surface of the 1st adhesive layer 102 in a plan view. The height of the burr corresponds to the height indicated by symbol 41.

By setting the height of the burr on the outer peripheral edge of the first resin film to 6.0 μm or less, the gap between the laminate and the suction device can be reduced. Therefore, it is estimated that the force for adsorbing the laminated sheet is not easily reduced. Therefore, the height of the burr is preferably 5.0 μm or less, more preferably 4.0 μm or less, and may also be 3.0 μm or less.

The lower limit of the height of the burr is not particularly limited, and the height of the burr may be 0.01 μm or more, 0.1 μm or more, 0.5 μm or more, or 1.0 μm or more. If the height of the burr is within the above range, it is also easy to prevent the problem of taking out multiple laminate sheets when the uppermost laminate sheet is taken out from the laminate body of the laminate sheet formed by overlapping multiple laminate sheets (multiple removal ).

The height of the burr can be measured with a stylus-type film thickness meter. As a stylus type film thickness meter, DEKTAK32 (manufactured by VEECO) can be mentioned, for example.

The laminated sheet may have burrs on the surface opposite to the first resin film side. Specifically, the burr may exist on the surface of the third protective film on the side opposite to the third adhesive layer side and the outer peripheral edge portion. The burr may be formed by melting and solidifying the material constituting the laminate (especially the material of the third resin film). The height of the burr that may be present on the surface opposite to the first resin film side may be more than 0 μm and 100 μm or less, or may be greater than the height of the burr on the outer peripheral edge of the first resin film.

The laminated film comprising the front surface plate 1 and the polarizing layer 2 constituting the laminated sheet is preferably at least along the direction in which the front surface plate 1 is inside and the polarizing layer 2 is outside (so-called in-folding method) ) Able to bend. Being able to bend means that it can be bent without breaking in a direction in which the front surface plate 1 is inside and the polarizing layer 2 is outside.

In another embodiment, the laminated film including the polarizing layer 2 constituting the laminated sheet is preferably at least along the direction in which the linear polarizing plate 20 is the inner side and the retardation film 22 is the outer side (so-called in-folding method) Able to bend. Being able to bend means that it can be bent without breaking in a direction in which the linear polarizing plate 20 is on the inside and the retardation film 22 is on the outside.

The shape of the laminate sheet in the plane direction may be, for example, a square shape, preferably a square shape having long sides and short sides, and more preferably a rectangular shape. When the shape of the surface direction of the laminated sheet is a rectangle, the length of the long side may be, for example, 10 mm to 1400 mm, and preferably 50 mm to 600 mm. The length of the short side is, for example, 5 mm to 800 mm, preferably 30 mm to 500 mm, and more preferably 50 mm to 300 mm. Each layer constituting the laminated sheet may be R processed at the corners, cut at the ends, or drilled.

The thickness of the laminated sheet varies depending on the function required of the laminated sheet and the purpose of the laminated sheet, and therefore is not particularly limited, but is, for example, 20 μm to 1,000 μm, preferably 50 μm to 500 μm.

[First resin film] The first resin film corresponds to a so-called separation film, and is laminated on the first adhesive layer. The first resin film is laminated on the polarizing layer via the first adhesive layer. Generally, for example, when a laminated sheet is bonded to a display panel or another optical member, the first resin film is peeled and removed. Therefore, the first resin film can be peeled from the first adhesive layer, and the surface of the first resin film is released from the first adhesive layer so as to be peelable. As the mold release treatment, a mold release treatment using a silicone-based, fluorine-based, or other mold-releasing agent can be cited.

The resin constituting the first resin film may be, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester such as polyethylene terephthalate or polyethylene naphthalate. Thermoplastic resins such as resins and polycarbonate resins. Polyester resins, such as polyethylene terephthalate, are preferable. The first resin film may have a single-layer structure or a multilayer structure, but from the viewpoints of ease of manufacture and manufacturing cost, a single-layer structure is preferred.

The thickness of the first resin film may be, for example, 20 μm or more and 200 μm or less, and may be 30 μm or more and 150 μm or less. The thickness of the first resin film refers to the thickness of the central part of the laminated sheet (not the outer peripheral edge part).

[The first adhesive layer] The first adhesive layer may be an adhesive layer for attaching the laminated sheet to the display panel. The first adhesive layer may include an adhesive composition mainly composed of (meth)acrylic, rubber, urethane, ester, silicone, and polyvinyl ether resins. Among them, an adhesive composition using a (meth)acrylic resin excellent in transparency, weather resistance, heat resistance, etc., as a base polymer is preferred. The adhesive composition can be an active energy ray hardening type or a heat hardening type.

As the (meth)acrylic resin (base polymer) used in the adhesive composition, for example, butyl (meth)acrylate, ethyl (meth)acrylate, and isooctyl (meth)acrylate are preferably used. A polymer or copolymer in which one or two or more of (meth)acrylates such as esters and 2-ethylhexyl (meth)acrylate are used as monomers. Polar monomers can be copolymerized in the raw polymer. Examples of polar monomers include (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, (meth)acrylamide, and N, N (meth)acrylic acid. -A monomer having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, etc. like dimethylaminoethyl and glycidyl (meth)acrylate.

The adhesive composition may contain a crosslinking agent. Examples of the crosslinking agent include: a metal ion having a valence of two or more and forming a carboxylic acid metal salt with a carboxyl group; a polyamine compound forming an amide bond with a carboxyl group; a polyepoxy compound or Polyols, which form ester bonds with carboxyl groups; polyisocyanate compounds, which form amide bonds with carboxyl groups. Among them, polyisocyanate compounds are preferred.

The adhesive composition may contain fine particles, beads (resin beads, glass beads, etc.), glass fibers, resins other than raw polymers, tackifiers, fillers (metal powder or other inorganic powders, etc.) for imparting light scattering properties. , Antioxidants, UV absorbers, dyes, pigments, colorants, defoamers, corrosion inhibitors, photopolymerization initiators and other additives.

It can be formed by applying an organic solvent diluent of the adhesive composition on a substrate and drying it.

The thickness of the first adhesive layer is preferably 10 μm or more, more preferably 20 μm or more. The upper limit of the thickness of the first adhesive layer is not particularly limited, and may be 50 μm or less, or 40 μm or less.

[Front Panel] Viewed from the visually recognizable side, the front surface plate 1 may be a layer constituting the outermost surface of the display device, or may be a layer arranged inside the display device. That is, after peeling off the third protective film, a resin film, or a resin film with a colored layer, or a laminated glass film, or a glass film with a colored layer may be further laminated on the front panel 1. As long as the front surface plate 1 is a plate-shaped body capable of transmitting light, the material and thickness are not limited, and may include only one layer, or two or more layers. As an example, a resin film, a glass film, etc. are mentioned. The front surface plate preferably has a resin film. The front surface plate 1 may be a laminate of a resin film and a glass film.

The thickness of the front surface plate 1 may be, for example, 30 μm to 200 μm, preferably 50 μm to 150 μm, and more preferably 50 μm to 100 μm.

When the front surface plate 1 has a resin film, examples of the material include acrylic resins such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; polyethylene, polypropylene, and polymethylmethacrylate; Polyolefin resins such as pentene and polystyrene; cellulosic resins such as triacetyl cellulose, acetyl cellulose butyrate, acryl cellulose, butyl cellulose, and acetyl acryl cellulose; Polyvinyl resins such as ethylene-vinyl acetate copolymers, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, and polyvinyl acetal; tungsten resins such as polyether and polyether; polyether ketone and polyether Ketone-based resins such as ether ketones; polyetherimides; polycarbonate-based resins; polyester-based resins; polyimide-based resins; polyimide-based resins; and polyamide-based resins. These polymers can be used alone or in combination of two or more. Among them, from the viewpoint of improving strength and transparency, it is preferable to use a polycarbonate resin, a polyester resin, a polyimide resin, a polyimide resin, or a polyimide resin.

The thickness of the resin film may be, for example, 10 μm to 100 μm, preferably 20 μm to 70 μm, and more preferably 30 μm to 60 μm.

The front surface plate 1 may be a film in which a hard coat layer is provided on at least one surface of a resin film to further increase the hardness. The hard coat layer can be formed on one side of the resin film or on both sides. By providing a hard coat layer, a front surface plate with improved hardness and scratch resistance can be made. The hard coat layer is, for example, a cured layer of ultraviolet curable resin. Examples of ultraviolet curable resins include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. In order to increase the hardness, the hard coat layer may contain additives. The additives are not limited, and examples include inorganic fine particles, organic fine particles, or a mixture of these.

It is preferable to form an abrasion layer on the visible side of the hard coat layer to improve abrasion resistance or prevent contamination by sebum or the like. The front surface plate may have an abrasion resistant layer, and the abrasion resistant layer may be a layer constituting the visually recognizable side surface of the front surface plate. The abrasion resistant layer contains a structure derived from a fluorine compound. The fluorine compound is preferably a compound having a silicon atom and having an alkoxy group or a halogen-like hydrolyzable group in the silicon atom. The hydrolyzable group undergoes a dehydration condensation reaction to form a coating film, and it reacts with the active hydrogen on the surface of the substrate to improve the adhesion of the wear layer. In addition, when the fluorine compound has a perfluoroalkyl group or perfluoropolyether structure, it can impart water repellency, which is preferable. Particularly preferred is a fluorine-containing polyorganosiloxane compound having a perfluoropolyether structure and a long-chain alkyl group with a carbon number of 4 or more. It is also preferable to use two or more kinds of compounds as the fluorine compound. As the fluorine compound contained more preferably, a fluorine-containing organosiloxane compound containing an alkylene group having a carbon number of 2 or more and a perfluoroalkylene group.

The thickness of the wear layer is, for example, 1 nm to 20 nm. In addition, the abrasion resistant layer has water repellency, and the water contact angle is, for example, about 110° to 125°. The contact angle hysteresis and the sliding angle measured by the sliding method are about 3°-20° and 2°-55°, respectively. Furthermore, within a range that does not hinder the effects of the present invention, the wear layer may also contain silanol condensation catalysts, antioxidants, rust inhibitors, ultraviolet absorbers, light stabilizers, antifungal agents, antibacterial agents, and biological adhesion. Various additives such as inhibitors, deodorants, pigments, flame retardants, and antistatic agents.

It is also possible to provide a primer layer between the wear-resistant layer and the hard coat layer. As the primer, for example, there are primers such as ultraviolet curing type, thermosetting type, moisture curing type, or two-component curing type epoxy compound. In addition, as the primer, polyamic acid can be used, and a silane coupling agent is also preferably used. The thickness of the primer layer is, for example, 0.001 μm to 2 μm.

As a method of obtaining a laminate including a wear layer and a hard coat layer, it can be formed by applying a primer as necessary on the hard coat layer, drying and hardening to form a primer layer, and then A composition containing a fluorine compound (composition for coating a wear layer) is applied and dried. Examples of coating methods include dip coating, roll coating, bar coating, spin coating, spray coating, die coating, and gravure coater methods. In addition, it is also preferable to perform hydrophilization treatment such as plasma treatment, corona treatment, or ultraviolet treatment on the coating surface before applying the primer or the composition for coating the wear layer. The laminate can also be directly laminated on the front surface plate, or it can be laminated on another transparent substrate by using an adhesive or adhesive to bond it to the front surface plate.

When the front surface plate 1 has a glass film, it is preferable to use tempered glass for a display as a glass film. The thickness of the glass film may be, for example, 10 μm or more and 500 μm or less, or 20 μm or more and 100 μm or less. By using a glass film, the front surface plate 1 having excellent mechanical strength and surface hardness can be constructed.

In the case of using the laminated sheet for a display device, the front surface panel 1 may have a function as a window film in the display device. The front surface plate 1 may further have a function as a touch sensor, a blue light blocking function, a viewing angle adjustment function, and the like.

[Polarizing layer] The polarizing layer may have a linear polarizing plate and a retardation film from the side close to the front surface plate. The polarizing layer may be a circular polarizing plate (including an elliptical polarizing plate). The circularly polarizing plate can absorb external light reflected in the display device, and therefore, can provide the laminated sheet with a function as an anti-reflection film. The polarizing layer is preferably a layer formed by curing a polymerizable liquid crystal compound. According to the present invention, although it has a layer formed by curing a polymerizable liquid crystal compound, the height of the burr can be reduced and the flexibility can be improved.

[Straight Polarizing Plate] The linear polarizing plate has a function of selectively transmitting linearly polarized light in one direction including natural light and other non-polarized light. The linear polarizing plate may include a stretched film or a stretched layer that adsorbs dichroic dyes, a liquid crystal layer, etc. as a polarizer. The liquid crystal layer contains a cured product of a polymerizable liquid crystal compound and a dichroic dye, and the dichroic dye is polymerized. The liquid crystal compound is dispersed and aligned in the cured layer. A linear polarizing plate using a liquid crystal layer as a polarizer has no limitation in the bending direction as compared with a stretched film or stretched layer to which a dichroic dye is adsorbed, so it is preferable.

(As a polarizer for a stretched film or stretched layer with dichroic pigments adsorbed) Polarizers, which are stretched films with dichroic pigments adsorbed, can usually be manufactured through the following steps: a step of uniaxially stretching a polyvinyl alcohol-based resin film; The step of dyeing the resin film to adsorb the dichroic pigment; the step of treating the polyvinyl alcohol resin film with the dichroic pigment adsorbed with the boric acid aqueous solution; and the step of washing with water after the treatment with the boric acid aqueous solution.

The thickness of the polarizer is generally 30 μm or less, preferably 18 μm or less, and more preferably 15 μm or less. Reducing the thickness of the polarizer is beneficial to making the laminate film thinner. The thickness of the polarizer is usually 1 μm or more, for example, it may be 5 μm or more.

The polyvinyl alcohol-based resin is obtained by saponifying a polyvinyl acetate-based resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and other monomers that can be copolymerized therewith can also be used. As other monomers that can be copolymerized with vinyl acetate, for example, unsaturated carboxylic acid-based compounds, olefin-based compounds, vinyl ether-based compounds, unsaturated sulfonic acid-based compounds, and (meth)propylene having an ammonium group can be cited. Amide-based compounds.

The degree of saponification of the polyvinyl alcohol-based resin is generally about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and polyvinyl formal, polyvinyl acetal, etc. modified by aldehydes may also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually 1,000 or more and 10,000 or less, preferably 1,500 or more and 5,000 or less.

A polarizer as a stretched layer to which a dichroic dye is adsorbed can usually be manufactured through the following steps: a step of applying a coating solution containing the above-mentioned polyvinyl alcohol-based resin on a base film, and a single layer of the resulting laminated film The step of axial stretching, the step of dyeing the polyvinyl alcohol resin layer of the monoaxially stretched laminate film with a dichroic dye, and adsorbing the dichroic dye to prepare a polarizer, using a boric acid aqueous solution The step of treating the film on which the dichroic dye is adsorbed, and the step of washing with water after treatment with an aqueous boric acid solution. The base film used to form the polarizer can be used as a protective layer of the polarizer. If necessary, the base film can be peeled and removed from the polarizer. The material and thickness of the base film may be the same as the material and thickness of the resin film described later.

The polarizer that is a stretched film or stretched layer to which a dichroic dye is adsorbed can be directly used as a linear polarizing plate, or it can be used as a linear polarizing plate by laminating a resin film on one or both sides. The thickness of the linear polarizing plate is preferably 2 μm or more and 40 μm or less.

Examples of the resin film include: cyclic polyolefin resin film; cellulose acetate resin film containing resins such as triacetyl cellulose and diacetyl cellulose; containing polyethylene terephthalate and polyethylene naphthalate Polyester resin films of resins such as ethylene glycol ester and polybutylene terephthalate; polycarbonate resin films; (meth)acrylic resin films; polypropylene resin films and other films known in the art . The polarizer and the protective layer can be laminated via the bonding layer described later.

The thickness of the resin film is, for example, 100 μm or less, preferably 80 μm or less, more preferably 60 μm or less, still more preferably 40 μm or less, still more preferably 30 μm or less, and usually 10 μm or more. From the standpoint of the absorptivity of, it is preferably 15 μm or more.

A hard coat layer can be formed on the resin film. The hard coat layer can be formed on one side of the resin film or on both sides. By providing a hard coat layer, a thermoplastic resin film with improved hardness and scratch resistance can be made. The hard coat layer can be formed in the same manner as the hard coat layer formed on the resin film.

(As a polarizer for the liquid crystal layer) The polymerizable liquid crystal compound used for forming the liquid crystal layer is a compound having a polymerizable reactive group and exhibiting liquid crystallinity. The polymerizable reactive group is a group that participates in the polymerization reaction, and is preferably a photopolymerizable reactive group. The photopolymerizable reactive group refers to a group that can participate in a polymerization reaction by a living radical or acid generated from a photopolymerization initiator. Examples of the photopolymerizable functional group include vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloxy, methacryloxy, and oxa Cyclopropyl, oxetanyl, etc. Among them, propyleneoxy, methacryloxy, vinyloxy, oxetanyl, and oxetanyl are preferred, and propyleneoxy is more preferred. The type of the polymerizable liquid crystal compound is not particularly limited, and rod-shaped liquid crystal compounds, discotic liquid crystal compounds, and mixtures thereof can be used. The liquid crystallinity of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and may be a nematic liquid crystal or a smectic liquid crystal as a phase sequence structure.

The dichroic dye used in the polarizer as the liquid crystal layer is preferably one having an absorption maximum wavelength (λMAX) in the range of 300 nm to 700 nm. Examples of such dichroic dyes include acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes, and anthraquinone dyes. Among them, azo dyes are preferred. Examples of azo dyes include monoazo dyes, bisazo dyes, trisazo dyes, tetrasazo dyes, and stilbene azo dyes, and bisazo dyes and trisazo dyes are preferred. The dichroic dye may be singly or in combination of two or more, preferably three or more in combination. In particular, it is more preferable to combine three or more azo compounds. A part of the dichroic dye may have a reactive group, and may also have liquid crystallinity.

As the polarizer of the liquid crystal layer, for example, a composition for forming a polarizer containing a polymerizable liquid crystal compound and a dichroic dye can be applied to an alignment film formed on a base film, and the polymerizable liquid crystal compound is polymerized to make it Hardened and formed. The base film used to form the polarizer can be used as a protective layer of the polarizer. The material and thickness of the base film may be the same as the material and thickness of the resin film.

As a composition for forming a polarizer containing a polymerizable liquid crystal compound and a dichroic dye, and a method for manufacturing a polarizer using the composition, Japanese Patent Laid-Open No. 2013-37353 and Japanese Patent Laid-Open 2013-33249 can be exemplified No. and Japanese Patent Laid-Open No. 2017-83843, etc. In addition to the polymerizable liquid crystal compound and the dichroic dye, the composition for forming a polarizer may further contain additives such as a solvent, a polymerization initiator, a crosslinking agent, a leveling agent, an antioxidant, a plasticizer, and a sensitizer. Only one kind of these components may be used, respectively, or two or more kinds may be used in combination.

The polymerization initiator that can be contained in the composition for forming a polarizer is a compound that can initiate a polymerization reaction of a polymerizable liquid crystal compound, and a photopolymerizable initiator is preferred in terms of being capable of initiating a polymerization reaction under lower temperature conditions. Specifically, photopolymerization initiators that can generate active radicals or acids by the action of light are exemplified. Among them, photopolymerization initiators that can generate free radicals by the action of light are preferred. The content of the polymerization initiator is preferably 1 part by mass or more and 10 parts by mass or less, and more preferably 3 parts by mass or more and 8 parts by mass or less with respect to 100 parts by mass of the total amount of the polymerizable liquid crystal compound. If it is within this range, the reaction of the polymerizable group proceeds sufficiently, and it is easy to stabilize the alignment state of the liquid crystal compound.

The thickness of the polarizer as the liquid crystal layer is usually 10 μm or less, preferably 0.5 μm or more and 8 μm or less, and more preferably 1 μm or more and 5 μm or less.

The polarizer as the liquid crystal layer can be used as a linear polarizing plate without peeling and removing the base film, or the base film may be peeled and removed from the polarizer and used as a linear polarizing plate. The polarizer as a liquid crystal layer can also be used as a linear polarizer by forming a protective layer on one or both surfaces. As the protective layer, the resin film described above can be used.

Regarding the polarizer as the liquid crystal layer, in order to protect the polarizer, etc., an overcoat may be provided on one or both sides of the polarizer. The overcoat layer can be formed by coating a material (composition) for forming the overcoat layer on a polarizer, for example. Examples of materials constituting the overcoat layer include photocurable resins and water-soluble polymers. As the material constituting the overcoat layer, (meth)acrylic resin, polyvinyl alcohol resin, etc. can be used.

[Retardation film] The retardation film contained in the polarizing layer may include a single retardation layer, or may be a laminate of two or more retardation layers. The retardation film is preferably a retardation layer including a layer formed by curing a polymerizable liquid crystal compound. When the retardation film is a laminate of two retardation layers, it is preferable that any retardation layer is a retardation layer including a layer formed by curing a polymerizable liquid crystal compound. The retardation film is laminated on the side of the polarizer opposite to the front surface plate side (or the third protective film side). The retardation film may have an overcoat to protect its surface, a base film that supports the retardation film, and the like.

The retardation film preferably includes a λ/4 layer as the retardation layer, and may further include at least any one of a λ/2 layer or a positive C layer. The retardation layer may have an alignment film. In the case where the retardation film includes a retardation layer as a λ/2 layer, a λ/2 layer and a λ/4 layer may be laminated in this order from the polarizer side. In the case where the retardation film includes a retardation layer as a positive C layer, a λ/4 layer and a positive C layer may be laminated in order from the polarizer side, or a positive C layer and λ/4 may be laminated in order from the polarizer side Floor.

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 of the resin film exemplified as the material of the protective layer, or may be formed of a layer formed by curing a polymerizable liquid crystal compound. The retardation layer may further include an alignment film. The retardation film may have a bonding layer for bonding the λ/4 layer, the λ/2 layer, and the positive C layer. As described later, the bonding layer may be formed of an adhesive layer or an adhesive layer.

When the polymerizable liquid crystal compound is cured to form a retardation layer, the retardation layer can be formed by applying a composition containing the polymerizable liquid crystal compound to a base film and curing it. An alignment film can be formed between the base film and the coating layer. The material and thickness of the base film may be the same as the material and thickness of the resin film. In the case where the retardation layer is formed from a layer formed by curing the polymerizable liquid crystal compound, the retardation layer may be assembled in the laminated sheet in the form of an alignment film and/or a base film. The retardation layer can be bonded to the linear polarizing plate via the bonding layer.

[Touch sensor layer] The touch sensor layer has at least a transparent conductive layer, and may further have a resin film. The touch sensor layer may include a transparent conductive layer and a resin film in order from the front surface plate side (or the third protective film side). The touch sensor layer may also include a resin film and a transparent conductive layer in order from the front surface plate side (or the third protective film side). The touch sensor layer may not include a resin film. In addition to the transparent conductive layer and the resin film, the touch sensor layer may also include a separation layer, a bonding layer, and a protective layer.

As the touch sensor layer, as long as it is a sensor capable of detecting a touched position on the surface of the display device and has a configuration with a transparent conductive layer, the detection method is not limited. As the detection method of the touch sensor layer, a resistive film method, an electrostatic capacitance method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, a surface acoustic wave method, etc. can be cited. Among them, in terms of low cost, fast response speed, and thin film, it is preferable to use an electrostatic capacitive touch sensor layer.

The transparent conductive layer may be a transparent conductive layer containing metal oxides such as indium tin oxide (ITO), or a metal layer containing metals such as aluminum, copper, silver, gold, or alloys of these.

The separation layer may be a layer formed on a substrate such as glass to separate the transparent conductive layer formed on the separation layer from the substrate together with the separation layer. The separation layer is preferably an inorganic layer or an organic layer. Examples of the material forming the inorganic layer include silicon oxide. As a material for forming the organic layer, for example, a (meth)acrylic resin composition, an epoxy resin composition, a polyimide resin composition, and the like can be used.

[The third protective film] The third protective film corresponds to a so-called surface protective film, and has a third adhesive layer on one side of the third resin film. The third protective film may be laminated on the front surface plate through the third adhesive layer. When a resin film including a colored layer is laminated on the front surface plate, or when the surface protective film is replaced, the third protective film is peeled off together with the third adhesive layer it has. Therefore, the third protective film can be peeled off from the front surface plate, and the third adhesive layer can adjust its adhesive force so that it can be peeled off from the front surface plate.

In another embodiment, the third protective film may be laminated on the polarizing layer through the third adhesive layer. When the front surface plate is laminated or the surface protective film is replaced, the third protective film is peeled off together with the third adhesive layer it has. Therefore, the third protective film can be peeled off from the polarizing layer, and the third adhesive layer can adjust its adhesive force in such a way that it can be peeled off from the polarizing layer. [Third Adhesive Layer] The third adhesive layer may be composed of the same adhesive composition as the first adhesive layer. The thickness of the third adhesive layer is preferably 10 μm or more, more preferably 20 μm or more. The upper limit of the thickness of the first adhesive layer is not particularly limited, and may be 50 μm or less, or 40 μm or less.

[The third resin film] Examples of the resin constituting the third resin film include the same resins as the resin constituting the first resin film. The resin constituting the third resin film is preferably a polyester resin such as polyethylene terephthalate. The third resin film may have a single-layer structure or a multilayer structure. From the viewpoints of ease of manufacture and manufacturing cost, a single-layer structure is preferred. The thickness of the third resin film may be, for example, 20 μm or more and 200 μm or less, and may be 30 μm or more and 150 μm or less.

[Laminated layer] The bonding layer may be a layer for bonding each layer, and may be a layer containing an adhesive or an adhesive. Each bonding layer may include the same material or different materials. When the retardation film has a plurality of retardation layers, the retardation layers may be bonded to each other through an adhesive layer, or may be bonded through an adhesive layer. The linear polarizing plate and the retardation film are preferably bonded by an adhesive layer.

As the adhesive layer constituting the bonding layer, the same adhesive layer as the above-mentioned first adhesive layer or third adhesive layer can be used.

As the adhesive, for example, it can be formed by combining one or two or more of water-based adhesives, active energy ray-curable adhesives, and the like. As the water-based adhesive, for example, a polyvinyl alcohol-based resin aqueous solution, an aqueous two-component urethane-based emulsion adhesive, and the like can be cited. Active energy ray curable adhesives are adhesives that are cured by irradiating active energy rays such as ultraviolet rays. Examples include adhesives containing polymerizable compounds and photopolymerizable initiators, adhesives containing photoreactive resins, and adhesives containing adhesives. Adhesives for resins and photoreactive crosslinking agents. Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers, and photocurable urethane monomers, and those derived from these monomers. Body oligomers and so on. Examples of the photopolymerization initiator include compounds containing substances that generate active species such as neutral radicals, anionic radicals, and cationic radicals by irradiation with active energy rays such as ultraviolet rays.

When the bonding layer is an adhesive layer, the thickness of the adhesive layer is preferably 1 μm or more and 30 μm or less, more preferably 2 μm or more and 20 μm, and 3 μm or more and 10 μm or less. When the bonding layer is an adhesive layer, the thickness of the adhesive layer is preferably 0.01 μm or more and 5 μm or less, more preferably 0.1 μm or more and 3 μm or less.

＜Manufacturing method of laminated sheet＞ The manufacturing method of the laminated sheet includes a preparation step of preparing a laminated body, and a cutting step of obtaining the laminated sheet from the laminated body. The manufacturing method of the laminated sheet may also include the peeling process of peeling the 2nd protective film.

The laminate prepared in the preparation step is obtained by sequentially laminating the front surface plate, the polarizing layer, the first adhesive layer, the first resin film, and the second protective film. The laminated body prepared in the preparation step can be laminated with the third protective film on the front surface plate as described above. The second protective film has a second adhesive layer on one side of the second resin film, and the second protective film is laminated on the first resin film via the second adhesive layer. The first resin film can be peeled from the first adhesive layer, and the second protective film can be peeled from the first resin film. The laminate may have layers (touch sensor layer, impact resistant film, resin film, etc.) that the laminate sheet may include. The laminated body may be a long strip or a monolithic body of a predetermined size. The first protective film, the front surface plate, the polarizing layer, and the like can use those described above.

In another embodiment, the laminate prepared in the preparation step is obtained by laminating a polarizing layer, a first adhesive layer, a first resin film, and a second protective film in this order. In the laminate prepared in the preparation step, the third protective film may be laminated on the polarizing layer as described above. The second protective film has a second adhesive layer on one side of the second resin film, and the second protective film is laminated on the first resin film via the second adhesive layer. The first resin film can be peeled from the first adhesive layer, and the second protective film can be peeled from the first resin film. The laminate may have layers (touch sensor layer, impact resistant film, resin film, etc.) that the laminate sheet may include. The laminated body may be a long strip or a monolithic body of a predetermined size. The first protective film, the polarizing layer, and the like can be those described above.

The laminated body 400 shown in FIG. 3 has a front surface plate 1, a polarizing layer 2, a first adhesive layer 102, a first resin film 101, and a second protective film 200 laminated in this order. The second protective film 200 has a second adhesive layer 202 on one side of the second resin film 201. The second protective film 200 is laminated on the first resin film 101 via the second adhesive layer 202. The first resin film 101 can be peeled from the first adhesive layer 102, and the second protective film 200 can be peeled from the first resin film 101.

[Second protective film] The second protective film corresponds to a so-called surface protective film, and has a second adhesive layer on one side of the second resin film. The second protective film is laminated on the first resin film via the second adhesive layer. After the cutting step of obtaining the laminated sheet from the laminated body is completed, the second protective film is peeled and removed together with the second adhesive layer it has. Therefore, the second protective film can be peeled from the first resin film, and the adhesive force of the second adhesive layer can be adjusted so as to be peelable from the first resin film.

The adhesion force of the second protective film to the first resin film is preferably smaller than the adhesion force of the first resin film to the first adhesive layer. When the second protective film is peeled off, it is unlikely that the first resin film is unintentionally peeled off.

The thickness of the second protective film may be, for example, 30 μm or more and 200 μm or less, and may be 40 μm or more and 150 μm or less.

[Second resin film] Examples of the resin constituting the second resin film include the same resins as the resin constituting the first resin film. The resin constituting the second resin film is preferably a polyester resin such as polyethylene terephthalate. The second resin film may have a single-layer structure or a multilayer structure. From the viewpoints of ease of manufacture and manufacturing cost, a single-layer structure is preferred. The thickness of the second resin film may be, for example, 20 μm or more and 100 μm or less, 30 μm or more and 80 μm or less, or 40 μm or more.

[Second Adhesive Layer] The second adhesive layer may be composed of the same adhesive composition as the first adhesive layer. The thickness of the second adhesive layer is preferably 3 μm or more, more preferably 5 μm or more. The upper limit of the thickness of the first adhesive layer is not particularly limited, and may be 50 μm or less, or 40 μm or less.

The laminate is produced by laminating each layer on top of each other, and the order of laminating each layer is not particularly limited. The laminate is manufactured, for example, by including a step of laminating a front surface plate and a polarizing layer, a step of laminating a first adhesive layer and a first resin film on the polarizing layer, and a step of laminating a second protective film on the first resin film Method to obtain. In another embodiment, the laminate is obtained, for example, by a manufacturing method including a step of laminating a first adhesive layer and a first resin film on a polarizing layer, and a step of laminating a second protective film on the first resin film .

The cutting step of obtaining the laminated sheet from the laminated body is performed by irradiating the laminated body with laser light from the front surface panel side (the visible side) to cut the laminated body into a predetermined shape. That is, the surface on the emission side of the laser light is constituted by the second protective film. Since the laminate includes the second protective film, the first resin film is not a layer constituting the outermost surface of the laminate, but is a layer existing inside the laminate. Compared with the outer peripheral edge of the layer existing inside the laminate, relatively large burrs are more likely to be formed on the outer peripheral edge of the laser light emission side surface. Therefore, since the laminate includes the second protective film, it is easy to make the height of the burr on the outer peripheral edge of the first resin film 6.0 μm or less.

For the laser, for example, a laser that emits light of a wavelength included in the range of 200 nm to 11 μm is used. The laser can be a continuous wave (CW) laser or a pulsed laser. Examples of laser types include _{gas lasers such as CO 2} lasers, solid lasers such as Yttrium Aluminum Garnet (Yttrium Aluminum Garnet, YAG) lasers, and semiconductor lasers. In terms of the absorption area that is easily suitable for the laminated sheet, a CO ₂ laser is preferable.

When the output of the laser is large, the height of the burr on the outer peripheral edge of the first resin film tends to be small. In the case of using a CO ₂ laser, the output of the laser is preferably 50 W or more, more preferably 60 W or more, and still more preferably 100 W or more. The upper limit of the laser output is not particularly limited, and it can be set to 200 W or less, for example.

From the same point of view, the energy of the laser light irradiated by scanning of unit length (hereinafter sometimes referred to as irradiation energy.) is preferably 100 mJ/mm or more, more preferably 200 mJ/mm or more, and still more preferably 250 Above mJ/mm. The upper limit of the irradiation energy is not particularly limited. For example, it is 1000 mJ/mm or less, and may be 500 mJ/mm or less.

The speed at which the laser light moves on the surface of the laminate (hereinafter sometimes referred to as the moving speed.) is preferably 50 mm/sec or more and 2000 mm/sec or less, more preferably 100 mm/sec or more and 1000 mm/sec or less, and further It is preferably 150 mm/sec or more and 700 mm/sec or less, and may also be 300 mm/sec or more.

When the laser light is condensed by the lens, the focus of the laser light can be aimed at the surface on the front panel side of the laminate, or at the surface on the side of the second protective film, or at the inside of the laminate. The spot size of the laser light can be 5 μm or more and 100 μm or less, and it can be 10 μm or more and 70 μm or less. The depth of focus (DOF) of the lens can be 10 μm or more and 500 μm or less, and it can be 100 μm or more and 300 μm or less.

The cutting step can be performed with full cutting, or temporarily cut with half cutting to a depth that does not cut the laminated body, and then irradiate the laser light one or more times to completely cut the laminated body. Full cutting refers to cutting all layers in the stacking direction by one laser light irradiation. From the viewpoint of reducing the height of the burr on the outer peripheral edge of the first protective film, it is desirable to perform the cutting step by full cutting.

The manufacturing method of the laminated sheet may also include the peeling process of peeling the 2nd protective film. By peeling off the second protective film, a laminated sheet in which the front surface plate, the polarizing layer, the first adhesive layer, and the first resin film are sequentially laminated can be obtained. In another embodiment, by peeling off the second protective film, a laminated sheet in which the polarizing layer, the first adhesive layer, and the first resin film are sequentially laminated can be obtained.

When the third protective film is laminated on the front surface plate of the laminated sheet, a resin film or a glass film or another protective film may be laminated on the surface exposed by peeling off the third protective film. This step may include a step of adsorbing and holding the side of the separation membrane, and peeling off the third protective film.

＜Display device＞ The display device is obtained by peeling off the first resin film to expose the first adhesive layer, and bonding the laminated sheet on the display panel through the first adhesive layer. The laminated sheet is particularly preferably used for the display surface of a flexible display panel. The display panel may be configured to be foldable with the visually recognized side surface as the inner side, or may be configured to be able to be wound. Specific examples of the display panel include liquid crystal display elements, organic electro-luminescence (EL) display elements, inorganic EL display elements, plasma display elements, and field emission display elements.

The display device can be used as mobile devices such as smart phones, input boards, televisions, digital photo frames, electronic billboards, measuring instruments or measuring instruments, office equipment, medical equipment, computer equipment, etc. [Example]

Hereinafter, the present invention will be explained in more detail with examples, but the present invention is not limited by these examples. In this embodiment, unless otherwise specified, the unit "part" of the ratio of the compounded substance is the weight basis.

[Determination of the height of the burr] The measurement was carried out with a stylus-type film thickness meter (DEKTAK32, manufactured by VEECO). The height of the burr was measured at 11 locations included within a 60 mm range along the edge of the laminated sheet, and the average value was obtained. Repeat the same operation 5 times, and use the average value as the height of the burr.

[First resin film with first adhesive layer] Prepare a polyethylene terephthalate film (thickness 50 μm) with a release treatment on one of the surfaces. An acrylic adhesive layer (first adhesive layer) is formed on the mold release treatment surface.

[Second protective film] Prepare a surface protection film with an acrylic adhesive layer (thickness 6 μm) formed on one side of a polyethylene terephthalate film (thickness 50 μm).

[The third protective film] Prepare a surface protection film in which an acrylic adhesive layer (thickness 10 μm) is formed on one side of a polyethylene terephthalate film (thickness 125 μm).

[Front Panel] As the front surface plate, one having a hard coat layer formed on one of the surfaces of a polyimide (PI) film is used. The thickness of the polyimide film is 50 μm, and the thickness of the hard coat layer is 10 μm.

[Circular Polarizing Plate] An alignment film is formed on one surface of the triacetyl cellulose (Triacetyl Cellulose, TAC) film. A composition containing a polymerizable liquid crystal compound and a dichroic dye is coated on the alignment film. The coating film is aligned and cured to obtain a polarizer. Coating ultraviolet curable resin on the polarizer. The coating film is hardened to form an outer coating. In this way, a linear polarizing plate is obtained. The thickness of the TAC film is 25 μm, the thickness of the polarizer is 2.5 μm, and the thickness of the outer coating is 1.0 μm. The polarizer is a polarizer in which a dichroic dye is dispersed and aligned in a layer formed by curing a polymerizable liquid crystal compound.

As the retardation layer, a λ/4 layer having a layer formed by curing a polymerizable liquid crystal compound and a positive C layer having a layer formed by curing a polymerizable liquid crystal compound were prepared. The two are bonded together with an ultraviolet curable adhesive to produce a retardation film.

The linear polarizing plate and the retardation film are bonded together with the acrylic adhesive layer to obtain a circular polarizing plate. The retardation film is laminated on the outer coating side of the linear polarizing plate. The angle between the absorption axis of the polarizer and the slow axis of the λ/4 layer is 45°.

[Example 1 to Example 4, Comparative Example 2] The front surface plate and the circular polarizing plate are laminated with each other via an acrylic adhesive layer. The thickness of the acrylic adhesive layer was 25 μm. The front surface plate is laminated on the TAC film side of the circular polarizing plate.

The acrylic adhesive layer (first adhesive layer) formed on the first resin film is laminated on the circular polarizing plate. The thickness of the acrylic adhesive layer was 25 μm.

The third protective film is laminated on the front surface plate through the adhesive layer included in the third protective film. A second protective film is laminated on the first resin film via the adhesive layer included in the second protective film. In this way, a laminate in which the third protective film, the front surface plate, the circular polarizing plate, the first adhesive layer, the first resin film, and the second protective film were sequentially laminated was produced. The first resin film can be peeled from the first adhesive layer, the second protective film can be peeled from the first resin film, and the third protective film can be peeled from the front surface plate.

The laminate was irradiated with laser light under the conditions shown in Table 1, and the laminate was cut into a predetermined shape (length 20 mm × width 100 mm) to obtain a laminate sheet. The second protective film was peeled off, and the height of the burr was measured at the outer peripheral edge of the first resin film. The results are shown in Table 1.

[Example 5 to Example 6] The acrylic adhesive layer (first adhesive layer) formed on the first resin film is laminated on the circular polarizing plate. The thickness of the acrylic adhesive layer was 25 μm. Furthermore, the first adhesive layer is laminated on the retardation film side of the circular polarizing plate.

The third protective film is laminated on the circular polarizing plate through the adhesive layer included in the third protective film. A second protective film is laminated on the first resin film via the adhesive layer included in the second protective film. In this way, a laminate in which the third protective film, the circular polarizing plate, the first adhesive layer, the first resin film, and the second protective film were sequentially laminated was produced. The first resin film can be peeled from the first adhesive layer, the second protective film can be peeled from the first resin film, and the third protective film can be peeled from the circular polarizing plate.

The laminated body was irradiated with laser light under the conditions shown in Table 2, and the laminated body was cut into a predetermined shape (20 mm in length × 100 mm in width) to obtain a laminated sheet. The second protective film was peeled off, and the height of the burr was measured at the outer peripheral edge of the first resin film. The results are shown in Table 2.

[Comparative Example 1, Comparative Example 3 to Comparative Example 4] The front surface plate and the circular polarizing plate are laminated on each other through an acrylic adhesive layer. The thickness of the acrylic adhesive layer was 25 μm. The front surface plate is laminated on the TAC film side of the circular polarizing plate. The acrylic adhesive layer (first adhesive layer) formed on the first resin film is laminated on the circular polarizing plate. The thickness of the acrylic adhesive layer was 25 μm. The third protective film is laminated on the front surface plate through the adhesive layer included in the third protective film. In this way, a laminate in which the third protective film, the front surface plate, the circular polarizing plate, the first adhesive layer, and the first resin film were laminated in this order was produced. The first resin film can be peeled from the first adhesive layer, and the third protective film can be peeled from the front surface plate.

The laminated body was irradiated with laser light under the conditions shown in Table 1, and the laminated body was cut into a predetermined shape (20 mm in length × 100 mm in width) to obtain a laminated sheet. The height of the burr was measured at the outer peripheral edge of the first resin film. The results are shown in Table 1.

[Comparative Example 5 to Comparative Example 6] The acrylic adhesive layer (first adhesive layer) formed on the first resin film is laminated on the circular polarizing plate. The thickness of the acrylic adhesive layer was 25 μm. Furthermore, the first adhesive layer is laminated on the retardation film side of the circular polarizing plate. The third protective film is laminated on the circular polarizing plate through the adhesive layer included in the third protective film. In this way, a laminate in which the third protective film, the circular polarizing plate, the first adhesive layer, and the first resin film are sequentially laminated is produced. The first resin film can be peeled from the first adhesive layer, and the third protective film can be peeled from the circular polarizer.

The laminated body was irradiated with laser light under the conditions shown in Table 2, and the laminated body was cut into a predetermined shape (20 mm in length × 100 mm in width) to obtain a laminated sheet. The height of the burr was measured at the outer peripheral edge of the first resin film. The results are shown in Table 2.

[Table 1] Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Second protective film Have Have Have Have without Have without without Laser Irradiation direction From the visual side From the visual side From the visual side From the visual side From the visual side From the opposite side of visual recognition From the visual side From the opposite side of visual recognition Exposure times (times) 1 1 1 1 1 1 10 1 Output (W) 55 63 138 175 55 55 30 55 Moving speed (mm/s) 200 200 500 500 200 200 500 200 Irradiation energy (mJ/mm) 275 313 275 350 275 275 60 275 The height of the burr (μm) 2.9 4.2 3.5 4.3 35.4 41.8 69.7 40.7

[Table 2] Example 5 Example 6 Comparative example 5 Comparative example 6 Second protective film Have Have without without Laser Irradiation direction From the visual side From the visual side From the visual side From the opposite side of visual recognition Exposure times (times) 1 1 1 1 Output (W) 32 52 32 32 Moving speed (mm/s) 200 200 200 200 Irradiation energy (mJ/mm) 160 260 160 160 The height of the burr (μm) 1.5 3.0 28.7 33.2

In the table, the number of times of laser light irradiation once means that the laminated body is cut by a full cut, and the number of times of laser light irradiation 10 times means that all layers in the lamination direction are completely cut in the 10th irradiation. In the table, the "self-recognizable side" refers to, for example, irradiating the laser in the direction from the front surface plate 1 to the second protective film 200 in FIG. The second protective film 200 irradiates the laser toward the direction of the front surface plate 1.

In the layered sheet of the present invention, the height of the burr on the outer peripheral edge of the first protective film is 6.0 μm or less, and when the surface protective film is peeled from the layered sheet, the adsorption force is unlikely to decrease.

1: Front surface plate 2: Polarizing layer 3: Laminated layer 5: The third protective film 20: Linear polarizer 22: retardation film 40: glitch 41: The height of the burr 50: The third adhesive layer 51: The third resin film 101: The first resin film 102: The first adhesive layer 200: second protective film 201: Second resin film 202: second adhesive layer 300: Multilayer film 301: Laminate 302: Multilayer 303: Laminate 400: Laminated body

Fig. 1 is a schematic cross-sectional view showing an example of the laminated sheet of the present invention. Fig. 2 is a schematic cross-sectional view showing an example of the laminated sheet of the present invention. Fig. 3 is a schematic cross-sectional view showing an example of a laminated body used when manufacturing the laminated sheet of the present invention. Fig. 4 is a schematic cross-sectional view showing an example of the laminated sheet of the present invention. Fig. 5 is a schematic cross-sectional view showing an example of the laminated sheet of the present invention.

1: Front surface plate

2: Polarizing layer

3: Laminated layer

20: Linear polarizer

22: retardation film

40: glitch

41: The height of the burr

101: The first resin film

102: The first adhesive layer

300: Multilayer film

Claims (10)

A laminated sheet in which a polarizing layer, a first adhesive layer, and a first resin film are sequentially laminated, and The first resin film can be peeled from the first adhesive layer, The height of the burr on the outer peripheral edge of the first resin film is 6.0 μm or less. A laminated sheet in which a front surface plate, a polarizing layer, a first adhesive layer, and a first resin film are sequentially laminated, and The first resin film can be peeled from the first adhesive layer, The height of the burr on the outer peripheral edge of the first resin film is 6.0 μm or less. The laminated sheet according to claim 1 or 2, wherein the height of the burr is 0.1 μm or more. The laminated sheet according to any one of claims 1 to 3, wherein the polarizing layer includes a layer formed by curing a polymerizable liquid crystal compound. A method for manufacturing a laminated sheet includes: a preparation step, preparing a laminated body, in the laminated body, A polarizing layer, a first adhesive layer, a first resin film, and a second protective film are laminated in sequence, The second protective film has a second adhesive layer on one side of the second resin film, The second protective film is laminated on the first resin film via the second adhesive layer, The first resin film can be peeled from the first adhesive layer, The second protective film can be peeled from the first resin film; and In the cutting step, the laminated body is irradiated with laser light from the polarizing layer side to cut the laminated body into a predetermined shape to obtain a laminated sheet. A method for manufacturing a laminated sheet includes: a preparation step, preparing a laminated body, in the laminated body, The front surface plate, the polarizing layer, the first adhesive layer, the first resin film, and the second protective film are laminated in sequence, The second protective film has a second adhesive layer on one side of the second resin film, The second protective film is laminated on the first resin film via the second adhesive layer, The first resin film can be peeled from the first adhesive layer, The second protective film can be peeled from the first resin film; and In the cutting step, laser light is irradiated to the laminated body from the front surface plate side to cut the laminated body into a predetermined shape to obtain a laminated sheet. The method for manufacturing a laminate sheet according to claim 5 or claim 6, wherein in the cutting step, the output of the laser light is 50 W or more and 200 W or less. The method for manufacturing a laminated sheet according to any one of Claims 5 to 7, wherein in the cutting step, the laminated body is cut into a predetermined shape by full cutting. The method for manufacturing a laminated sheet according to any one of claims 5 to 8, wherein the thickness of the second resin film is 40 μm or more. The method for manufacturing a laminated sheet according to any one of claims 5 to 9, wherein the polarizing layer has a layer formed by curing a polymerizable liquid crystal compound.

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