KR20220149510A - Laminated sheet and its manufacturing method - Google Patents

Abstract

In the present invention, a laminated sheet including a front plate and a polarizing layer is produced by cutting with a laser from a long laminate to a sheet of a predetermined shape. When peeling a surface protection film from a laminated sheet provided with a front plate and a polarizing layer, an object of this invention is to provide the lamination|stacking sheet in which adsorption|suction force does not fall easily. The front plate, the polarizing layer, the first pressure-sensitive adhesive layer, and the first resin film are laminated in this order, and the first resin film is peelable from the first pressure-sensitive adhesive layer, and is formed on the outer periphery of the first resin film The height of the burr is 6.0 μm or less, the laminated sheet.

Description

Laminated sheet and its manufacturing method

The present invention relates to a laminated sheet and a method for manufacturing the same.

The lamination sheet provided with a front plate and a polarizing layer is bonded to a display panel via the adhesive layer formed in the polarizing layer side, and comprises a display device. Until the lamination sheets are pasted together, a separate film is laminated on the pressure-sensitive adhesive layer and a surface protection film is laminated on the front plate in order to prevent the surface from being contaminated or scratched. When laminating|stacking the resin film provided with a colored layer on a front plate, or pasting up a surface protection film anew, the separator film side is adsorb|sucked and hold|maintained first. Then, the surface protection film on a front plate is peeled off, a front plate is exposed, and the resin film provided with a colored layer is laminated|stacked, or a surface protection film is newly pasted.

A laminated sheet provided with a front plate and a polarizing layer is manufactured by cutting with a laser from an elongate laminated body to a sheet-fed body of a predetermined shape. In particular, when the laminated sheet has a layer in which the polymerizable liquid crystal compound is cured, laser cutting is compared with cutting with a blade, and microcracks (for example, the length is 200 µm or less), which is excellent. When the display device is bendable, if minute cracks exist at the ends of the laminated sheet, the laminated sheet may be fractured due to the minute cracks as a trigger during bending. Therefore, cutting with a laser is preferable.

WO2016／158300

When cutting with a laser was performed, it became clear that a burr generate|occur|produced in the outer periphery of the surface of a laminated sheet. When this burr peels a surface protection film from a laminated sheet, it will reduce the force which adsorb|sucks a separate film, and will raise the problem that a laminated|stacked sheet is not hold|maintained. When peeling a surface protection film from a lamination sheet, an object of this invention is to provide the lamination|stacking sheet in which adsorption|suction force does not fall easily.

[1] The polarizing layer, the first pressure-sensitive adhesive layer, and the first resin film are laminated in this order,

The first resin film is peelable from the first pressure-sensitive adhesive layer,

The height of the burr in the outer periphery of the said 1st resin film is 6.0 micrometers or less, a laminated sheet.

[2] The front plate, the polarizing layer, the first pressure-sensitive adhesive layer, and the first resin film are laminated in this order, and the first resin film is peelable from the first pressure-sensitive adhesive layer,

The height of the burr in the outer periphery of the said 1st resin film is 6.0 micrometers or less, a laminated sheet.

[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 in which a polymerizable liquid crystal compound is cured.

[5] The polarizing layer, the first pressure-sensitive adhesive layer, the first resin film, and the second protective film are laminated in this order,

The second protective film has a second pressure-sensitive adhesive layer on one side of the second resin film,

The second protective film is laminated on the first resin film with the second pressure-sensitive adhesive layer interposed therebetween,

The first resin film is peelable from the first pressure-sensitive adhesive layer,

The said 2nd protective film is a preparatory process of preparing the laminated body which can peel from the said 1st resin film;

The manufacturing method of a laminated sheet including the cutting process of cutting the said laminated body into a predetermined shape by irradiating a laser beam to a laminated body from the said polarizing layer side, and obtaining a laminated sheet.

[6] The front plate, the polarizing layer, the first pressure-sensitive adhesive layer, the first resin film, and the second protective film are laminated in this order,

The second protective film has a second pressure-sensitive adhesive layer on one side of the second resin film,

The second protective film is laminated on the first resin film with the second pressure-sensitive adhesive layer interposed therebetween,

The first resin film is peelable from the first pressure-sensitive adhesive layer,

The said 2nd protective film is a preparatory process of preparing the laminated body which can peel from the said 1st resin film;

The manufacturing method of a laminated sheet including the cutting process of irradiating a laser beam to a laminated body from the said front plate side, cutting the laminated body into a predetermined shape, and obtaining a laminated sheet.

[7] The method for producing 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 for producing a laminated sheet according to any one of [5] to [7], wherein in the cutting step, the laminate is cut into a predetermined shape by full cutting.

[9] The method for producing a laminated sheet according to any one of [5] to [8], wherein the second resin film has a thickness of 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 in which a polymerizable liquid crystal compound is cured.

ADVANTAGE OF THE INVENTION According to this invention, when peeling a surface protection film from a lamination|stacking sheet, the lamination|stacking sheet in which adsorption|suction force does not fall easily can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows an example of the lamination|stacking sheet of this invention.
It is a schematic sectional drawing which shows an example of the lamination|stacking sheet of this invention.
It is a schematic sectional drawing which shows an example of the laminated body used when manufacturing the laminated sheet of this invention.
It is a schematic sectional drawing which shows an example of the lamination|stacking sheet of this invention.
It is a schematic sectional drawing which shows an example of the lamination|stacking sheet of this invention.

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

<Lamination sheet>

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows an example of the lamination sheet of this invention. In the lamination sheet 300 shown in FIG. 1, the front plate 1, the polarizing layer 2, the 1st adhesive layer 102, and the 1st resin film 101 are laminated|stacked in this order. The front plate 1 and the polarizing layer 2 are bonded together by the bonding layer 3 . The polarizing layer 2 has the linear polarizing plate 20 and the retardation film 22 from the front plate 1 side. The first pressure-sensitive adhesive layer 102 may be a pressure-sensitive adhesive layer for bonding the laminated sheet to the display panel. The first resin film 101 corresponds to a so-called separate film. The first resin film 101 is peelable from the first pressure-sensitive adhesive layer 102 , and the surface of the first resin film 101 is subjected to a release treatment so that it can be peeled from the first pressure-sensitive adhesive layer 102 .

4 : is a schematic sectional drawing which shows an example of the lamination|stacking sheet of this invention. In the lamination sheet 302 shown in FIG. 4, the polarizing layer 2, the 1st adhesive layer 102, and the 1st resin film 101 are laminated|stacked in this order. The polarizing layer 2 has the retardation film 22 and the linear polarizing plate 20 from the 1st resin film 101 side. The first pressure-sensitive adhesive layer 102 may be a pressure-sensitive adhesive layer for bonding the laminated sheet to the display panel. The first resin film 101 corresponds to a so-called separate film. The first resin film 101 is peelable from the first pressure-sensitive adhesive layer 102 , and the surface of the first resin film 101 is subjected to a release treatment so that it can be peeled from the first pressure-sensitive adhesive layer 102 .

A laminated sheet can be equipped with a 3rd protective film on the side opposite to the polarizing layer side in a front plate, or the side opposite to the 1st resin film side in a polarizing layer. 2 and 5 are schematic cross-sectional views showing an example of the laminated sheet of the present invention. As for the lamination sheet 301 shown in FIG. 2, the 3rd protective film 5, the front plate 1, the polarizing layer 2, the 1st adhesive layer 102, and the 1st resin film 101 are this order. is stacked with The front plate 1 and the polarizing layer 2 are bonded together by the bonding layer 3 . The polarizing layer 2 has the linear polarizing plate 20 and the retardation film 22 from the front plate 1 side. The 3rd protective film 5 corresponds to what is called a surface protection film, and has the 3rd adhesive layer 50 on one side of the 3rd resin film 51. The third protective film 5 is laminated on the front plate 1 with the third pressure-sensitive adhesive layer 50 interposed therebetween. The adhesive force is adjusted so that the 3rd protective film 5 can peel from the front plate 1, and the 3rd adhesive layer 50 is peelable from the front plate 1.

In the lamination sheet 303 shown in FIG. 5, the 3rd protective film 5, the polarizing layer 2, the 1st adhesive layer 102, and the 1st resin film 101 are laminated|stacked in this order. The polarizing layer 2 has the retardation film 22 and the linear polarizing plate 20 from the 1st resin film 101 side. The 3rd protective film 5 corresponds to what is called a surface protection film, and has the 3rd adhesive layer 50 on one side of the 3rd resin film 51. The 3rd protective film 5 is laminated|stacked on the polarizing layer 2 with the 3rd adhesive layer 50 interposed therebetween. The adhesive force is adjusted so that the 3rd protective film 5 can peel from the polarizing layer 2, and the 3rd adhesive layer 50 can peel from the polarizing layer 2.

A lamination sheet can be equipped with layers other than the layer shown to FIGS. 1-2 and FIGS. 4-5. The laminated sheet may include, for example, a touch sensor layer, an impact-resistant film disposed between the front 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 in the outer periphery of the first resin film is 6.0 µm or less. Burrs are residues on the outside of the geometry, at the edges of the corners of the laminated sheets, and may be residues on the laminated sheets after they have undergone machining or forming processes.

Specifically, the burr is a surface on the opposite side to the side of the first pressure-sensitive adhesive layer in the first resin film, and the material constituting the laminate sheet (particularly the material of the first resin film) present in the outer periphery is melted, It may be coagulated. The burr may be produced by laser processing. The burr may exist in at least a part of the whole periphery of the outer periphery of a 1st protective film in planar view, and may exist in the whole perimeter of an outer periphery of a 1st protective film.

In FIG. 1 , a burr 40 is a surface on the opposite side to the first pressure-sensitive adhesive layer 102-side surface of the first resin film 101, and is present on the outer periphery of the first resin film 101 in plan view. The height of the burr corresponds to the height indicated by the reference numeral 41 .

When the height of the burr in the outer periphery of a 1st resin film is 6.0 micrometers or less, the clearance gap between a lamination sheet and an adsorption|suction apparatus can be made small. Therefore, it is estimated that the force which adsorb|sucks a laminated sheet becomes difficult to fall. Therefore, it is preferable that the height of a burr is 5.0 micrometers or less, It is more preferable that it is 4.0 micrometers or less, and 3.0 micrometers or less may be sufficient.

Although the lower limit of the height of a burr is not specifically limited, The height of a burr may be 0.01 micrometer or more, it may be 0.1 micrometer or more, 0.5 micrometer or more may be sufficient, and 1.0 micrometer or more may be sufficient as it. If the height of the burr is within the above range, it is easy to prevent a defect (multiple take-out) of taking out the plurality of laminated sheets when the uppermost laminated sheet is taken out from the laminate of the laminated sheets on which the plurality of laminated sheets are stacked.

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

The lamination sheet can have a burr also on the surface on the opposite side to the 1st resin film side. Specifically, a burr is a surface on the side opposite to the 3rd adhesive layer side in a 3rd protective film, Comprising: It may exist in the outer periphery part. The burr may be one in which a material constituting the laminated sheet (particularly, a material of the third resin film) is melted and solidified. The height of the burrs that may exist on the surface opposite to the first resin film side may be greater than 0 µm and 100 µm or less, and may be greater than the height of the burrs at the outer periphery of the first resin film.

The laminated film comprising the front plate 1 and the polarizing layer 2 constituting the laminated sheet has at least the front plate 1 on the inside and the polarizing layer 2 on the outside in a direction (so-called in-folding). method), it is preferable to be bendable. Being bendable means that the front plate 1 can be turned inside and the polarizing layer 2 can be bent in one direction without cracking.

In another embodiment, the laminated|multilayer film provided with the polarizing layer 2 which comprises a laminated sheet made at least the linear polarizing plate 20 inside, and made the retardation film 22 outside the direction (so-called in-folding). method), it is preferable to be bendable. Being bendable means that the linear polarizing plate 20 can be turned inside and the retardation film 22 can be bent in one direction without cracking.

The shape of the lamination sheet in the plane direction may be, for example, a rectangular shape, preferably a rectangular shape having a long side and a short side, and more preferably a rectangle. When the shape of the surface direction of a lamination sheet is a rectangle, the length of the long side may be 10 mm - 1400 mm, for example, Preferably they are 50 mm - 600 mm. The length of the short side is, for example, 5 mm - 800 mm, Preferably they are 30 mm - 500 mm, More preferably, they are 50 mm - 300 mm. Each of the layers constituting the laminated sheet may have an R-processed portion, a notched end portion, or a hole-processed portion.

Although the thickness of a lamination sheet is not specifically limited since it differs with the function calculated|required of a lamination sheet, the use of a lamination sheet, etc., For example, it is 20 micrometers - 1,000 micrometers, Preferably it is 50 micrometers - 500 micrometers.

[First Resin Film]

The 1st resin film corresponds to what is called a separate film, and is laminated|stacked on the 1st adhesive layer. The 1st resin film is laminated|stacked on the polarizing layer through the 1st adhesive layer. Usually, when a lamination sheet is pasted together by a display panel or another optical member, for example, a 1st resin film is peeled and removed. Therefore, the release process is carried out on the surface so that a 1st resin film may peel from a 1st adhesive layer, and a 1st resin film may be peeled from a 1st adhesive layer. As a mold release process, the mold release process by mold release agents, such as a recon type|system|group and a fluorine type, etc. are mentioned.

The resin constituting the first resin film is, for example, a polyethylene-based resin such as polyethylene, a polypropylene-based resin such as polypropylene, a polyester-based resin such as polyethylene terephthalate or polyethylene naphthalate, a polycarbonate-based resin, etc. It may be a thermoplastic resin. Preferably, it is polyester-type resin, such as a polyethylene terephthalate. Although the 1st resin film may have a single layer structure or a multilayer structure may be sufficient as it, From viewpoints, such as manufacturing easiness and manufacturing cost, Preferably it has a single layer structure.

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 1st resin film means the thickness of the central part (not an outer periphery part) of a laminated sheet.

[First Adhesive Layer]

A 1st adhesive layer may be an adhesive layer for bonding a laminated sheet together to a display panel. The first pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition mainly containing a resin such as (meth)acrylic, rubber, urethane, ester, silicone, or polyvinyl ether. Especially, the adhesive composition which uses (meth)acrylic-type resin excellent in transparency, weather resistance, heat resistance, etc. as a base polymer is preferable. An active energy ray hardening type or a thermosetting type may be sufficient as an adhesive composition.

As the (meth)acrylic resin (base polymer) used in the pressure-sensitive adhesive composition, for example, (meth) butyl acrylate, (meth) ethyl acrylate, (meth) acrylate isooctyl, (meth) acrylate 2-ethylhexyl ( The polymer or copolymer which uses 1 type(s) or 2 or more types of meth)acrylic acid ester as a monomer is used preferably. You may copolymerize a polar monomer with a base polymer. Examples of the polar monomer include (meth)acrylic acid, (meth)acrylic acid 2-hydroxypropyl, (meth)acrylic acid hydroxyethyl, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate, The monomer which has a carboxy group, a hydroxyl group, an amide group, an amino group, an epoxy group, etc. like glycidyl (meth)acrylate is mentioned.

The pressure-sensitive adhesive composition may include a crosslinking agent. Examples of the crosslinking agent include those that form a metal carboxylate salt between a carboxyl group and a divalent or higher metal ion; A polyamine compound that forms an amide bond with a carboxy group; A polyepoxy compound or polyol that forms an ester bond with a carboxy group; As a polyisocyanate compound, what forms an amide bond between a carboxy group is mentioned. Especially, a polyisocyanate compound is preferable.

The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders and other inorganic powders, etc.), antioxidants, ultraviolet rays Additives, such as an absorber, dye, a pigment, a coloring agent, an antifoamer, a corrosion inhibitor, and a photoinitiator, may be included.

It can form by apply|coating the organic solvent dilution liquid of the said adhesive composition on a base material, and drying.

It is preferable that it is 10 micrometers or more, and, as for the thickness of a 1st adhesive layer, it is more preferable that it is 20 micrometers or more. Although the upper limit of the thickness of a 1st adhesive layer is not specifically limited, 50 micrometers or less may be sufficient and 40 micrometers or less may be sufficient as it.

[Front panel]

The front plate 1 may be a layer constituting the outermost surface of the display device when viewed from the viewer side, or may be a layer disposed inside the display device. That is, after peeling off a 3rd protective film, on the front plate 1, a resin film is further laminated|stacked, the resin film which has a colored layer is laminated|stacked, a glass film is laminated|stacked, or a glass film which has a colored layer is laminated|stacked. You can do it. The material and thickness are not limited as long as the front plate 1 is a plate-shaped body which can transmit light, It may be comprised with only one layer, and may be comprised with two or more layers. As the example, a resin film, a glass film, etc. are mentioned. It is preferable that the front plate has a resin film. The front plate 1 may be a laminate of a resin film and a glass film.

The thickness of the front plate 1 may be, for example, 30-200 micrometers, Preferably it is 50-150 micrometers, More preferably, it is 50-100 micrometers.

When the front plate 1 has a resin film, as the material, For example, Acrylic resin, such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; polyolefin resins such as polyethylene, polypropylene, polymethylpentene and polystyrene; cellulose resins such as triacetyl cellulose, acetyl cellulose butyrate, propionyl cellulose, butyryl cellulose and acetyl propionyl cellulose; polyvinyl-based resins such as ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol and polyvinyl acetal; sulfone-based resins such as polysulfone and polyethersulfone; ketone resins such as polyether ketone and polyether ether ketone; polyetherimide; polycarbonate-based resin; polyester-based resin; polyimide-based resin; polyamideimide-based resins; and polyamide-based resins. These polymers can be used individually or in mixture of 2 or more types. Among them, it is preferable to use a polycarbonate-based resin, a polyester-based resin, a polyimide-based resin, a polyamideimide-based resin, or a polyamide-based resin from the viewpoint of improving strength and transparency.

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

The front plate 1 may be a film in which hardness is further improved by providing a hard coat layer on at least one surface of the resin film. The hard-coat layer may be formed in one surface of a resin film, or may be formed in both surfaces. By providing a hard-coat layer, it can be set as the front plate which improved hardness and scratch property. A hard-coat layer is a hardened layer of ultraviolet curable resin, for example. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard-coat layer may contain the additive in order to improve hardness. The additive is not limited, and inorganic fine particles, organic fine particles, or a mixture thereof may be mentioned.

In order to improve abrasion resistance or prevent contamination by sebum etc. on the visual recognition side of the said hard coating layer, it is preferable that the abrasion-resistant layer is formed. The front plate may have an abrasion-resistant layer, and the abrasion-resistant layer may be a layer constituting the visual side surface of the front plate. The wear-resistant layer includes a structure derived from a fluorine compound. As a fluorine compound, it has a silicon atom, and the compound which has a hydrolysable group like an alkoxy group and a halogen in a silicon atom is preferable. A coating film can be formed by a hydrolysable group dehydration-condensation reaction, and the adhesiveness of an abrasion-resistant layer can be improved by reacting with active hydrogen on the surface of a base material. Moreover, when a fluorine compound has a perfluoroalkyl group or a perfluoropolyether structure, since water repellency can be provided, it is preferable. Particularly preferred are fluorine-containing polyorganosiloxane compounds having a perfluoropolyether structure and a long-chain alkyl group having 4 or more carbon atoms. It is also preferable to use two or more types of compounds as a fluorine compound. As a fluorine compound preferably further included, it is a fluorine-containing organosiloxane compound containing a C2 or more alkylene group and a perfluoroalkylene group.

The thickness of the wear-resistant layer is, for example, 1 to 20 nm. Moreover, the abrasion-resistant layer has water repellency, and a water contact angle is about 110-125 degrees, for example. The contact angle hysteresis and the sliding angle measured by the sliding method are about 3 to 20 degrees and about 2 to 55 degrees, respectively. In addition, the wear-resistant layer is a silanol condensation catalyst, antioxidant, rust inhibitor, ultraviolet absorber, light stabilizer, fungicide, antibacterial agent, bioadhesion inhibitor, deodorant, pigment, flame retardant, antistatic agent, in the range that does not impair the effects of the present invention. You may contain various additives, such as an inhibitor.

You may provide a primer layer between an abrasion-resistant layer and a hard-coat layer. As a primer agent, there exist primer agents, such as an epoxy compound of an ultraviolet curing type, a thermosetting type, a moisture curing type, or a two-component curing type, for example. Moreover, as a primer agent, a polyamic acid may be used and it is also preferable to use a silane coupling agent. The thickness of the primer layer is, for example, 0.001 to 2 µm.

As a method of obtaining a laminate comprising an abrasion-resistant layer and a hard coat layer, a primer layer is formed by applying, drying, and curing a primer agent as necessary on the hard coat layer, followed by a composition containing a fluorine compound (abrasion-resistant layer). It can be formed by apply|coating and drying the composition for coating. Examples of the coating method include a dip coating method, a roll coating method, a bar coating method, a spin coating method, a spray coating method, a die coating method, and a gravure coater method. Moreover, it is also preferable to perform hydrophilization treatment, such as plasma treatment, corona treatment, or ultraviolet treatment, to an applied surface before apply|coating a primer agent or the composition for abrasion-resistant layer coating. This laminate may be directly laminated on the front plate, or laminated on another transparent substrate may be laminated on the front plate using an adhesive or an adhesive.

When the front plate 1 has a glass film, as for the glass film, tempered glass for a display is used preferably. 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 the glass film, it is possible to constitute the front plate 1 having excellent mechanical strength and surface hardness.

When a laminated sheet is used for a display device, the front plate 1 may have a function as a window film in a display device. The front plate 1 may further have a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, and the like.

[Polarization layer]

The polarizing layer may have a linear polarizing plate and a retardation film from the side close to the front plate. The polarizing layer may be a circularly polarizing plate (including an elliptically polarizing plate). Since a circularly polarizing plate can absorb the external light reflected in a display apparatus, it can provide the function as an antireflection film to a laminated sheet. It is preferable that a polarizing layer has the layer by which the polymerizable liquid crystal compound was hardened|cured. ADVANTAGE OF THE INVENTION According to this invention, although a polymeric liquid crystal compound has a hardened|cured layer, the height of a burr can be made small, and a flexibility can be improved.

[Linear Polarizer]

The linearly polarizing plate has a function of selectively transmitting linearly polarized light in one direction, which consists of light rays of unpolarized light such as natural light. The linear polarizing plate includes a stretched film or stretched layer to which a dichroic dye is adsorbed, a cured product of a polymerizable liquid crystal compound, and a dichroic dye, and the dichroic dye is dispersed and oriented in the layer in which the polymerizable liquid crystal compound is cured. A liquid crystal layer or the like can be provided as a polarizer. The linear polarizing plate using the liquid crystal layer as a polarizer is preferable because there is no restriction|limiting in a bending direction compared with the stretched film or stretched layer to which the dichroic dye was adsorbed.

(A polarizer that is a stretched film or stretched layer to which a dichroic dye is adsorbed)

A polarizer, which is a stretched film to which a dichroic dye is adsorbed, is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, and dyeing a polyvinyl alcohol-based resin film with a dichroic dye such as iodine, thereby adsorbing the dichroic dye. It can manufacture through a process, the process of treating the polyvinyl alcohol-type resin film to which the dichroic dye has adsorbed with the aqueous boric acid solution, and the process of washing with water after the process with the aqueous boric acid solution.

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

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

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

The polarizer as the stretched layer to which the dichroic dye is adsorbed is usually a process of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, a process of uniaxially stretching the obtained laminated film, poly of the uniaxially stretched laminated film By dyeing the vinyl alcohol-based resin layer with a dichroic dye, the dichroic dye is adsorbed to form a polarizer; the film to which the dichroic dye is adsorbed is treated with an aqueous boric acid solution; It can be manufactured through You may use the base film used in order to form a polarizer as a protective layer of a polarizer. You may peel and remove a base film from a polarizer as needed. The material and thickness of a base film may be the same as the material and thickness of the resin film mentioned later.

The polarizer which is a stretched film or a stretched layer to which the dichroic dye was adsorbed may be used as a linear polarizing plate as it is, a resin film may be bonded together on the single side|surface or both surfaces, and may be used as a linear polarizing plate. The thickness of a linearly polarizing plate becomes like this. Preferably they are 2 micrometers or more and 40 micrometers or less.

The resin film is, for example, a cyclopolyolefin-based resin film; Cellulose acetate-type resin film which consists of resin, such as a triacetyl cellulose and a diacetyl cellulose; a polyester-based resin film made of a resin such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polycarbonate-based resin film; (meth)acrylic resin film; Well-known films in the art, such as a polypropylene resin film, are mentioned. A polarizer and a protective layer can be laminated|stacked through the bonding layer mentioned 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, Moreover, it is 10 micrometers or more normally, From a viewpoint of raising the absorption rate of a laser, Preferably it is 15 micrometers or more.

The hard-coat layer may be formed on the resin film. The hard-coat layer may be formed in one side of a resin film, and may be formed in both surfaces. By providing a hard-coat layer, it can be set as the thermoplastic resin film which improved hardness and scratch property. A hard-coat layer can be carried out similarly to the hard-coat layer formed in the resin film mentioned above, and can be formed.

(a polarizer that is a liquid crystal layer)

The polymerizable liquid crystal compound used to form the liquid crystal layer is a compound having a polymerizable reactive group and exhibiting liquid crystallinity. A polymerizable reactive group is a group which participates in a polymerization reaction, and it is preferable that it is a photopolymerizable reactive group. The photopolymerization reactive group refers to a group capable of participating in a polymerization reaction by an active radical or an acid generated from a photopolymerization initiator. Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an oxetanyl group. . Among these, acryloyloxy group, methacryloyloxy group, vinyloxy group, oxiranyl group and oxetanyl group are preferable, and acryloyloxy group is more preferable. The kind of polymerizable liquid crystal compound is not specifically limited, A rod-shaped liquid crystal compound, a disk-shaped liquid crystal compound, and these mixtures can be used. The liquid crystallinity of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and a nematic liquid crystal or a smectic liquid crystal may be sufficient as a normal-order structure.

As a dichroic dye used for the polarizer which is a liquid crystal layer, it is preferable to have an absorption maximum wavelength (λMAX) in the range of 300-700 nm. As such a dichroic dye, although an acridine dye, an oxazine dye, a cyanine dye, a naphthalene dye, an azo dye, an anthraquinone dye, etc. are mentioned, for example, Especially, an azo dye is preferable. As an azo dye, a monoazo dye, a bisazo dye, a trisazo dye, a tetrakis azo dye, a stilbenazo dye, etc. are mentioned, Preferably they are a bisazo dye and a trisazo dye. Although a dichroic dye may be individual or may combine 2 or more types, it is preferable to combine 3 or more types. In particular, it is more preferable to combine three or more types of azo compounds. A part of the dichroic dye may have a reactive group, and may have liquid crystallinity.

The polarizer, which is a liquid crystal layer, can be formed, for example, by applying a composition for forming a polarizer including a polymerizable liquid crystal compound and a dichroic dye on an alignment film formed on a base film, and polymerizing and curing the polymerizable liquid crystal compound. have. You may use the base film used in order to form a polarizer as a protective layer of a polarizer. The material and thickness of the base film may be the same as the material and thickness of the resin film described above.

As a composition for forming a polarizer comprising a polymerizable liquid crystal compound and a dichroic dye, and a method for producing a polarizer using the composition, JP-A-2013-37353, JP-A-2013-33249 , JP-A 2017- What was described in the publication No. 83843 etc. can be illustrated. In addition to the polymerizable liquid crystal compound and the dichroic dye, the composition for polarizer formation may further contain additives, such as a solvent, a polymerization initiator, a crosslinking agent, a leveling agent, antioxidant, a plasticizer, and a sensitizer. These components may use only 1 type, respectively, and may use them in combination of 2 or more type.

The polymerization initiator which the composition for polarizer formation may contain is a compound which can start the polymerization reaction of a polymeric liquid crystal compound, From the point which can start a polymerization reaction under more low-temperature conditions, a photoinitiator is preferable. Specifically, a photoinitiator capable of generating an active radical or an acid by the action of light is exemplified, and among these, a photoinitiator capable of generating a radical by the action of light is preferable.

To [ content of a polymerization initiator / 100 weight part of total amounts of a polymeric liquid crystal compound ], Preferably they are 1 mass part or more and 10 mass parts or less, More preferably, they are 3 mass parts or more and 8 mass parts or less. If it exists in this range, reaction of a polymeric group will fully advance and it will be easy to stabilize the orientation state of a liquid crystal compound.

The thickness of the polarizer which is a liquid crystal layer is 10 micrometers or less normally, Preferably they are 0.5 micrometer or more and 8 micrometers or less, More preferably, they are 1 micrometer or more and 5 micrometers or less.

The polarizer which is a liquid crystal layer may be used as a linear polarizing plate, without peeling and removing a base film, and it is good also as a linear polarizing plate by peeling and removing a base film from a polarizer. The polarizer which is a liquid crystal layer may provide a protective layer on the single side|surface or both surfaces, and may use it as a linear polarizing plate. As a protective layer, the above-mentioned resin film can be used.

The polarizer which is a liquid crystal layer may have an overcoat layer on the single side|surface or both surfaces of a polarizer for the purpose of protection of a polarizer, etc. The overcoat layer can be formed, for example, by applying a material (composition) for forming an overcoat layer on the polarizer. As a material which comprises an overcoat layer, a photocurable resin, a water-soluble polymer, etc. are mentioned, for example. As a material constituting the overcoat layer, (meth)acrylic resin, polyvinyl alcohol-based resin, or the like can be used.

[retardation film]

The retardation film contained in the polarizing layer may consist of one layer of retardation layer, and the laminated body of two or more retardation layers may be sufficient as it. It is preferable that retardation film is equipped with the retardation layer containing the layer by which the polymerizable liquid crystal compound was hardened|cured. 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 in which a polymerizable liquid crystal compound is cured. The retardation film is laminated|stacked on the side opposite to the front plate side (or 3rd protective film side) of a polarizer. The retardation film may have an overcoat layer which protects the surface, the base film etc. which support retardation film.

The retardation film preferably includes a λ/4 layer as the retardation layer, and may further include at least any of a λ/2 layer or a positive C layer. The retardation layer may have an orientation film. When the retardation film has a retardation layer that is a λ/2 layer, a λ/2 layer and a λ/4 layer can be laminated sequentially from the polarizer side. When the retardation film includes a retardation layer that is a positive C layer, the λ/4 layer and the positive C layer may be sequentially laminated from the polarizer side, and the positive C layer and the λ/4 layer may be laminated sequentially from the polarizer side.

The thickness of the retardation layer is, for example, 0.1 µm or more and 10 µm or less, preferably 0.5 µm or more and 8 µm or less, and more preferably 1 µm or more and 6 µm or less.

The retardation layer may be formed from the resin film exemplified as the material of the protective layer, or may be formed from a layer in which a polymerizable liquid crystal compound is cured. 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. A bonding layer may be formed from an adhesive bond layer or an adhesive layer so that it may mention later.

When the retardation layer is formed by curing the polymerizable liquid crystal compound, the retardation layer can be formed by applying a composition containing the polymerizable liquid crystal compound to a base film and curing the composition. You may form an orientation film between a base film and an application layer. The material and thickness of the base film may be the same as the material and thickness of the resin film. When forming a retardation layer with the layer formed by hardening|curing a polymeric liquid crystal compound, the retardation layer may be knitted into the lamination sheet in the form which has an orientation film and a base film. A phase difference layer can be bonded together with a linear polarizing plate through a bonding layer.

[Touch sensor layer]

A touch sensor layer may have a transparent conductive layer at least, and may have a resin film. A touch sensor layer may be provided with a transparent conductive layer and a resin film in order from the front plate side (or 3rd protective film side). A touch sensor layer may be provided with a resin film and a transparent conductive layer in order from the front-plate side (or 3rd protective film side). The touch sensor layer does not need to have a resin film. A touch sensor layer can be equipped with a separation layer, a bonding layer, and a protective layer other than a transparent conductive layer and a resin film.

As a touch sensor layer, it is a sensor which can detect the position touched on the surface of a display device, and if it is a structure which has a transparent conductive layer, a detection method will not be limited. Examples of the detection method of the touch sensor layer include a resistive film method, a capacitive method, an optical sensor method, an ultrasonic method, an electromagnetic inductive coupling method, and a surface acoustic wave method. Among them, a capacitive touch sensor layer is preferably used from the viewpoint of low cost, fast reaction speed, and thin film formation.

The transparent conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or a metal layer made of a metal such as aluminum, copper, silver, gold, or an alloy thereof.

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 together with the separation layer from the substrate. The separation layer is preferably an inorganic layer or an organic layer. As a material for forming the inorganic substance layer, for example, silicon oxide is exemplified. As a material for forming the organic layer, for example, a (meth)acrylic resin composition, an epoxy resin composition, a polyimide resin composition, or the like can be used.

[Third Protective Film]

A 3rd protective film corresponds to what is called a surface protection film, and has a 3rd adhesive layer on one side of a 3rd resin film. The third protective film may be laminated on the front plate with a third pressure-sensitive adhesive layer interposed therebetween. When a 3rd protective film laminates|stacks the resin film provided with a colored layer on a front plate, or attaches a new surface protection film, peeling is removed for every 3rd adhesive layer which it has. Therefore, the adhesive force is adjusted so that a 3rd protective film can peel from a front plate, and the 3rd adhesive layer can peel from a front plate.

In another embodiment, the third protective film may be laminated on the polarizing layer with a third pressure-sensitive adhesive layer interposed therebetween. A 3rd protective film is peeled and removed for every 3rd adhesive layer which it has, when laminating|stacking a front plate or pasting up a surface protection film anew. Therefore, the adhesive force is adjusted so that a 3rd protective film can peel from a polarizing layer, and a 3rd adhesive layer can peel from a polarizing layer.

[Third adhesive layer]

A 3rd adhesive layer can be comprised from the adhesive composition similar to the 1st adhesive layer.

It is preferable that it is 10 micrometers or more, and, as for the thickness of a 3rd adhesive layer, it is more preferable that it is 20 micrometers or more. Although the upper limit of the thickness of a 1st adhesive layer is not specifically limited, 50 micrometers or less may be sufficient and 40 micrometers or less may be sufficient as it.

[Third Resin Film]

As resin which comprises the 3rd resin film, resin similar to resin which comprises the 1st resin film is mentioned. It is preferable that resin which comprises a 3rd resin film is polyester-type resin, such as a polyethylene terephthalate. Although the 3rd resin film may have a single layer structure or a multilayer structure may be sufficient as it, From viewpoints, such as manufacturing easiness and manufacturing cost, Preferably it has a single layer structure. 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.

[Adhesive layer]

A bonding layer may be a layer for bonding each layer together, and may be a layer comprised from an adhesive or an adhesive agent. Each bonding layer may consist of the same material, or may consist of different materials. When retardation film has a some retardation layer, retardation layer may mutually be bonded together by an adhesive bond layer, and may be bonded together by an adhesive layer. It is preferable that a linearly polarizing plate and retardation film are bonded together by an adhesive layer.

As an adhesive layer which comprises a bonding layer, the adhesive layer similar to the 1st adhesive layer or 3rd adhesive layer mentioned above can be used.

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

When a bonding layer is an adhesive layer, the thickness of an adhesive layer becomes like this. Preferably they are 1 micrometer or more and 30 micrometers or less, More preferably, they are 2 micrometers or more and 20 micrometers, and are 3 micrometers or more and 10 micrometers or less. When a bonding layer is an adhesive bond layer, Preferably the thickness of an adhesive bond layer is 0.01 micrometer or more and 5 micrometers or less, More preferably, they are 0.1 micrometer or more and 3 micrometers or less.

<Method for producing laminated sheet>

The manufacturing method of a laminated sheet includes the preparatory process of preparing a laminated body, and the cutting process of obtaining a laminated body from a laminated body. The manufacturing method of a laminated sheet may be equipped with the peeling process of peeling a 2nd protective film.

As for the laminated body prepared by a preparatory process, a front plate, a polarizing layer, a 1st adhesive layer, a 1st resin film, and a 2nd protective film are laminated|stacked in this order. As for the laminated body prepared at a preparatory process, as mentioned above, the 3rd protective film may be laminated|stacked on the front plate. A 2nd protective film has a 2nd adhesive layer on one side of a 2nd resin film, and a 2nd protective film is laminated|stacked on the 1st resin film through a 2nd adhesive layer. A 1st resin film is peelable from a 1st adhesive layer, and a 2nd protective film is peelable from a 1st resin film. The laminate may have a layer (such as a touch sensor layer, an impact resistant film, and a resin film) which the laminate sheet may be provided with. The laminate may have a long shape or may be a sheet of a predetermined size. As the first protective film, the front plate, and the polarizing layer, those described above may be used.

In another embodiment, as for the laminated body prepared by a preparatory process, a polarizing layer, a 1st adhesive layer, a 1st resin film, and a 2nd protective film are laminated|stacked in this order. As for the laminated body prepared at a preparatory process, as above-mentioned, the 3rd protective film may be laminated|stacked on the polarizing layer. A 2nd protective film has a 2nd adhesive layer on one side of a 2nd resin film, and a 2nd protective film is laminated|stacked on the 1st resin film through a 2nd adhesive layer. A 1st resin film is peelable from a 1st adhesive layer, and a 2nd protective film is peelable from a 1st resin film. The laminate may have a layer (such as a touch sensor layer, an impact resistant film, and a resin film) which the laminate sheet may be provided with. The laminate may have a long shape or may be a sheet of a predetermined size. As the first protective film and the polarizing layer, those described above can be used.

As for the laminated body 400 shown in FIG. 3, the front plate 1, the polarizing layer 2, the 1st adhesive layer 102, the 1st resin film 101, and the 2nd protective film 200 are this order. is stacked with The second protective film 200 has a second pressure-sensitive adhesive layer 202 on one surface of the second resin film 201 . The second protective film 200 is laminated on the first resin film 101 with the second pressure-sensitive adhesive layer 202 interposed therebetween. The 1st resin film 101 is peelable from the 1st adhesive layer 102, The 2nd protective film 200 is peelable from the 1st resin film 101.

[Second Protective Film]

A 2nd protective film corresponds to what is called a surface protection film, and has a 2nd adhesive layer in one surface of a 2nd resin film. The 2nd protective film is laminated|stacked on the 1st resin film through the 2nd adhesive layer. After finishing the cutting process which obtains a laminated sheet from a laminated body, a 2nd protective film is peeled and removed for every 2nd adhesive layer which it has. Therefore, the adhesive force is adjusted so that a 2nd protective film can peel from a 1st resin film, and a 2nd adhesive layer can peel from a 1st resin film.

It is preferable that the adhesive force with respect to the 1st resin film of a 2nd protective film is smaller than the adhesive force with respect to the 1st adhesive layer of a 1st resin film. When peeling a 2nd protective film, the defect which peels a 1st resin film unintentionally does not occur easily.

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]

As resin which comprises a 2nd resin film, resin similar to resin which comprises a 1st resin film is mentioned. It is preferable that resin which comprises a 2nd resin film is polyester-type resin, such as a polyethylene terephthalate. Although a single layer structure or a multilayer structure may be sufficient as a 2nd resin film, from viewpoints, such as manufacturing easiness and manufacturing cost, Preferably it has a single layer structure. The thickness of a 2nd resin film may be 20 micrometers or more and 100 micrometers or less, for example, may be 30 micrometers or more and 80 micrometers or less, and 40 micrometers or more may be sufficient as them.

[Second pressure-sensitive adhesive layer]

A 2nd adhesive layer can be comprised from the adhesive composition similar to the 1st adhesive layer. It is preferable that it is 3 micrometers or more, and, as for the thickness of a 2nd adhesive layer, it is more preferable that it is 5 micrometers or more. Although the upper limit of the thickness of a 1st adhesive layer is not specifically limited, 50 micrometers or less may be sufficient and 40 micrometers or less may be sufficient as it.

A laminated body is produced by laminating|stacking each layer mutually, and the order of laminating|stacking each layer is not specifically limited. The laminate includes, for example, a step of laminating a front plate and a polarizing layer, a step of laminating a first pressure-sensitive 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. It is obtained by a manufacturing method comprising In another embodiment, a laminated body is a manufacturing method including the process of laminating|stacking a 1st adhesive layer and a 1st resin film on a polarizing layer, and the process of laminating|stacking a 2nd protective film on a 1st resin film, for example. is obtained by

The cutting process of obtaining a laminated body from a laminated body is performed by cutting a laminated body into a predetermined shape by irradiating a laser beam to a laminated body from the front plate side (viewing side). That is, the surface of the emission side of a laser beam is comprised with the 2nd protective film. When a laminated body is equipped with a 2nd protective film, a 1st resin film becomes a layer which exists in the inside of a laminated body, not the layer which comprises the outermost surface of a laminated body. A relatively large burr is likely to be formed on the outer periphery of the surface on the emitting side of the laser beam compared to the outer periphery of the layer existing inside the laminate. Therefore, when a laminated body is equipped with a 2nd protective film, it is easy to make the height of the burr in the outer periphery of a 1st resin film 6.0 micrometers or less.

As the laser, for example, a laser emitting light having a wavelength included in the range of 200 nm to 11 µm is used. A continuous wave (CW) laser may be sufficient as a laser, and a pulsed laser may be sufficient as it. As a kind _of laser, gas lasers, such as a CO2 laser, solid-state lasers, such as a YAG laser, and a semiconductor laser are mentioned. _A CO2 laser is preferable at the point which it is easy to adapt to the absorption region of a laminated sheet.

The height of the burr in the outer periphery of a 1st resin film will become small easily when the output of a laser is large. When the CO ₂ laser is used, 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. Although the upper limit of the output of a laser is not specifically limited, For example, it can be 200 W or less.

From the same viewpoint, the energy (hereinafter, sometimes referred to as irradiation energy) of the laser beam irradiated by scanning of a unit length is preferably 100 mJ/mm or more, more preferably 200 mJ/mm or more, and 250 mJ/mm or more. it is more preferable Although the upper limit of irradiation energy is not specifically limited, For example, it is 1000 mJ/mm or less, and may be 500 mJ/mm or less.

The speed at which the laser beam moves on the surface of the laminate (hereinafter, sometimes referred to as movement 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, more preferably 150 mm/sec or more and 700 mm/sec or less, and may be 300 mm/sec or more.

When a laser beam is condensed by a lens, the focal point of a laser beam may match with the front-plate side surface of a laminated body, may match with the surface on the side of a 2nd protective film, and may match with the inside of a laminated body. The spot size of a laser beam can be 5 micrometers or more and 100 micrometers or less, and can be 10 micrometers or more and 70 micrometers or less. The depth of focus (DOF) of a lens can be 10 micrometers or more and 500 micrometers or less, and can be 100 micrometers or more and 300 micrometers or less.

A cutting process may be performed by full cutting, once a notch is put to the depth which does not cut a laminated body by half cutting, and a laser beam is irradiated again once or several times, and you may cut out a laminated body completely. Full cutting means cutting all the layers along the lamination direction by one laser beam irradiation. It is preferable to perform a cutting process by full cutting from a viewpoint of making small the height of the burr in the outer peripheral part of a 1st protective film.

The manufacturing method of a laminated sheet may be equipped with the peeling process of peeling a 2nd protective film. By peeling a 2nd protective film, the laminated sheet in which the front plate, a polarizing layer, a 1st adhesive layer, and the 1st resin film were laminated|stacked in this order can be obtained. In another embodiment, by peeling a 2nd protective film, the laminated sheet on which the polarizing layer, the 1st adhesive layer, and the 1st resin film were laminated|stacked in this order can be obtained.

When the 3rd protective film is laminated|stacked on the front plate of a laminated sheet, a resin film or a glass film may be laminated|stacked on the surface which peeled and exposed a 3rd protective film, or you may laminate|stack another protective film. This process may include the process of adsorb|sucking and holding the separator film side, and peeling a 3rd protective film.

<Display device>

A display device peels a 1st resin film, exposes a 1st adhesive layer, and is obtained by bonding a lamination sheet to a display panel through a 1st adhesive layer. A laminated sheet is especially preferable for the use applied to the display surface of the display panel which has flexibility. The display panel may be configured to be foldable with the viewer-side surface inside, or may be configured to be able to be wound. Specific examples of the display panel include a liquid crystal display element, an organic EL display element, an inorganic EL display element, a plasma display element, and a field emission type display element.

The display device can be used as a mobile device such as a smartphone or tablet, a television, a digital photo frame, an electronic signage, a measuring instrument or instrument, an office device, a medical device, a computer device, and the like.

Example

Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these. In this Example, the unit "parts" of the proportion in which the substances are blended is based on weight, unless otherwise specified.

[Measurement of burr height]

It measured using the stylus type film thickness meter (DEKTAK32, VEECO company make). The height of the burr was measured in 11 places included in the range of 60 mm along the short side of the lamination sheet, and the average was calculated|required. The same operation was repeated 5 times, and the average was taken as the height of the burr.

[First Resin Film with First Adhesive Layer]

A polyethylene terephthalate film (thickness of 50 µm) in which one surface was subjected to a release treatment was prepared. The acrylic adhesive layer (1st adhesive layer) was formed in the release process surface.

[Second Protective Film]

The surface protection film in which the acrylic adhesive layer (6 micrometers in thickness) was formed in one side of a polyethylene terephthalate film (50 micrometers in thickness) was prepared.

[Third Protective Film]

The surface protection film in which the acrylic adhesive layer (10 micrometers in thickness) was formed on one side of a polyethylene terephthalate film (125 micrometers in thickness) was prepared.

[Front panel]

As the front plate, one in which a hard coat layer was formed on one surface of a polyimide (PI) film was used. The thickness of the polyimide film was 50 micrometers, and the thickness of the hard-coat layer was 10 micrometers.

[Circular Polarizer]

An alignment film was formed on one surface of the triacetyl cellulose (TAC) film. On the alignment film, a composition having a polymerizable liquid crystal compound and a dichroic dye was applied. The coating film was orientated and hardened, and the polarizer was obtained. On the polarizer, ultraviolet curable resin was apply|coated. The coating film was cured to form an overcoat layer. In this way, a linear polarizing plate was obtained. The thickness of the TAC film was 25 μm, the thickness of the polarizer was 2.5 μm, and the thickness of the overcoat layer was 1.0 μm. In the polarizer, the dichroic dye was dispersed in the layer in which the polymerizable liquid crystal compound was cured, and was orientated.

As the retardation layer, a λ/4 layer having a layer in which the polymerizable liquid crystal compound was cured, and a positive C layer having a layer in which the polymerizable liquid crystal compound was cured were prepared. Both were bonded together with the ultraviolet curing adhesive, and retardation film was produced.

The linearly polarizing plate and the retardation film were bonded together with the acrylic adhesive layer, and the circularly polarizing plate was obtained. The retardation film was laminated|stacked on the overcoat layer side of a linear polarizing plate. The angle between the absorption axis of the polarizer and the slow axis of the λ/4 layer was 45°.

[Examples 1 to 4, Comparative Example 2]

A front plate and a circularly polarizing plate were laminated|stacked on each other via an acrylic adhesive layer. The thickness of this acrylic adhesive layer was 25 micrometers. The front plate was laminated|stacked on the TAC film side of a circularly polarizing plate.

On the circularly polarizing plate, the acrylic adhesive layer (1st adhesive layer) formed on the 1st resin film was laminated|stacked. The thickness of this acrylic adhesive layer was 25 micrometers.

The 3rd protective film was laminated|stacked on the front plate via the adhesive layer with which the 3rd protective film is equipped. The 2nd protective film was laminated|stacked on the 1st resin film through the adhesive layer with which the 2nd protective film is equipped. In this way, the laminated body in which the 3rd protective film, the front plate, a circularly polarizing plate, the 1st adhesive layer, the 1st resin film, and the 2nd protective film were laminated|stacked in this order was produced. The 1st resin film was peelable from the 1st adhesive layer, the 2nd protective film was peelable from the 1st resin film, The 3rd protective film was peelable from the front plate.

By irradiating the laminate with a laser beam under the conditions shown in Table 1, the laminate was cut into a predetermined shape (length 20 mm x width 100 mm) to obtain a laminate sheet. The second protective film was peeled off, and the height of the burr was measured in the outer periphery of the first resin film. A result is shown in Table 1.

[Examples 5 to 6]

On the circularly polarizing plate, the acrylic adhesive layer (1st adhesive layer) formed on the 1st resin film was laminated|stacked. The thickness of this acrylic adhesive layer was 25 micrometers. Moreover, the 1st adhesive layer was laminated|stacked on the retardation film side of a circularly polarizing plate.

The 3rd protective film was laminated|stacked on the circularly polarizing plate through the adhesive layer with which the 3rd protective film is equipped. The 2nd protective film was laminated|stacked on the 1st resin film through the adhesive layer with which the 2nd protective film is equipped. In this way, the 3rd protective film, the circularly polarizing plate, the 1st adhesive layer, the 1st resin film, and the 2nd protective film were laminated|stacked in this order to produce the laminated body. The 1st resin film was peelable from the 1st adhesive layer, the 2nd protective film was peelable from the 1st resin film, The 3rd protective film was peelable from the circularly polarizing plate.

By irradiating the laminate with a laser beam under the conditions shown in Table 2, the laminate was cut into a predetermined shape (length 20 mm x width 100 mm) to obtain a laminate sheet. The second protective film was peeled off, and the height of the burr was measured in the outer periphery of the first resin film. A result is shown in Table 2.

[Comparative Examples 1, 3 to 4]

A front plate and a circularly polarizing plate were laminated|stacked on each other via an acrylic adhesive layer. The thickness of this acrylic adhesive layer was 25 micrometers. The front plate was laminated|stacked on the TAC film side of a circularly polarizing plate. On the circularly polarizing plate, the acrylic adhesive layer (1st adhesive layer) formed on the 1st resin film was laminated|stacked. The thickness of this acrylic adhesive layer was 25 micrometers. The 3rd protective film was laminated|stacked on the front plate via the adhesive layer with which the 3rd protective film is equipped. In this way, the laminated body in which the 3rd protective film, the front plate, a circularly polarizing plate, the 1st adhesive layer, and the 1st resin film were laminated|stacked in this order was produced. The 1st resin film was peelable from the 1st adhesive layer, and the 3rd protective film was peelable from the front plate.

By irradiating the laminate with a laser beam under the conditions shown in Table 1, the laminate was cut into a predetermined shape (length 20 mm x width 100 mm) to obtain a laminate sheet. At the outer periphery of the first resin film, the height of the burr was measured. A result is shown in Table 1.

[Comparative Examples 5 to 6]

On the circularly polarizing plate, the acrylic adhesive layer (1st adhesive layer) formed on the 1st resin film was laminated|stacked. The thickness of this acrylic adhesive layer was 25 micrometers. Moreover, the 1st adhesive layer was laminated|stacked on the retardation film side of a circularly polarizing plate. The 3rd protective film was laminated|stacked on the circularly polarizing plate through the adhesive layer with which the 3rd protective film is equipped. In this way, the laminated body in which the 3rd protective film, a circularly polarizing plate, the 1st adhesive layer, and the 1st resin film were laminated|stacked in this order was produced. The 1st resin film was peelable from a 1st adhesive layer, and the 3rd protective film was peelable from a circularly polarizing plate.

By irradiating the laminate with a laser beam under the conditions shown in Table 2, the laminate was cut into a predetermined shape (length 20 mm x width 100 mm) to obtain a laminate sheet. At the outer periphery of the first resin film, the height of the burr was measured. A result is shown in Table 2.

[Table 1]

[Table 2]

In the table, the number of times of laser beam irradiation once means that the laminate is cut by full cutting, and the number of times of laser beam irradiation of 10 times means that all layers in the stacking direction are completely cut by the 10th irradiation. In the table, "from the view side" means irradiating the laser in a direction from the front plate 1 to the second protective film 200 in FIG. 3, for example, and "from the side view side" means, for example, For example, in FIG. 3 , it means irradiating the laser in a direction from the second protective film 200 toward the front plate 1 .

The height of the burr in the outer periphery of a 1st protective film is 6.0 micrometers or less, and when the lamination|stacking sheet of this invention peels a surface protection film from a lamination sheet, the adsorption|suction force does not fall easily.

1: Front panel 2: Polarizing layer
3: bonding layer 5: 3rd protective film
20: linear polarizing plate 22: retardation film
40: burr 41: height of the burr
50: third pressure-sensitive adhesive layer 51: third resin film
101: first resin film 102: first pressure-sensitive adhesive layer
200: second protective film 201: second resin film
202: second pressure-sensitive adhesive layer 300: laminated sheet
301: laminated sheet 302: laminated sheet
303: laminated sheet 400: laminated body

Claims (10)

The polarizing layer, the first pressure-sensitive adhesive layer, and the first resin film are laminated in this order,
The first resin film is peelable from the first pressure-sensitive adhesive layer,
The height of the burr in the outer periphery of the said 1st resin film is 6.0 micrometers or less, a laminated sheet. The front plate, the polarizing layer, the first pressure-sensitive adhesive layer, and the first resin film are laminated in this order,
The first resin film is peelable from the first pressure-sensitive adhesive layer,
The height of the burr in the outer periphery of the said 1st resin film is 6.0 micrometers or less, a laminated sheet. 3. The method of claim 1 or 2,
The height of the burr is 0.1 μm or more, the laminated sheet. 4. The method according to any one of claims 1 to 3,
The said polarizing layer has a layer in which the polymerizable liquid crystal compound was hardened|cured, The lamination sheet|seat. The polarizing layer, the first pressure-sensitive adhesive layer, the first resin film, and the second protective film are laminated in this order,
The second protective film has a second pressure-sensitive adhesive layer on one side of the second resin film,
The second protective film is laminated on the first resin film with the second pressure-sensitive adhesive layer interposed therebetween,
The first resin film is peelable from the first pressure-sensitive adhesive layer,
The said 2nd protective film is a preparatory process of preparing the laminated body which can peel from the said 1st resin film;
The manufacturing method of a laminated sheet including the cutting process of cutting the said laminated body into a predetermined shape by irradiating a laser beam to a laminated body from the said polarizing layer side, and obtaining a laminated sheet. The front plate, the polarizing layer, the first pressure-sensitive adhesive layer, the first resin film, and the second protective film are laminated in this order,
The second protective film has a second pressure-sensitive adhesive layer on one side of the second resin film,
The second protective film is laminated on the first resin film with the second pressure-sensitive adhesive layer interposed therebetween,
The first resin film is peelable from the first pressure-sensitive adhesive layer,
The said 2nd protective film is a preparatory process of preparing the laminated body which can peel from the said 1st resin film;
The manufacturing method of a laminated sheet including the cutting process of cutting the said laminated body into a predetermined shape by irradiating a laser beam to a laminated body from the said front plate side, and obtaining a laminated sheet. 7. The method of claim 5 or 6,
In the said cutting process, the output of a laser beam is 50 W or more and 200 W or less, The manufacturing method of the laminated sheet. 8. The method according to any one of claims 5 to 7,
In the said cutting process, the manufacturing method of the laminated sheet which cuts the said laminated body into a predetermined shape by full cutting. 9. The method according to any one of claims 5 to 8,
The thickness of the said 2nd resin film is 40 micrometers or more, The manufacturing method of the laminated sheet. 10. The method according to any one of claims 5 to 9,
The said polarizing layer has the layer by which the polymeric liquid crystal compound was hardened|cured, The manufacturing method of the lamination sheet.

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