CN115244439A - Laminated sheet and method for producing same - Google Patents
Laminated sheet and method for producing same Download PDFInfo
- Publication number
- CN115244439A CN115244439A CN202180019939.0A CN202180019939A CN115244439A CN 115244439 A CN115244439 A CN 115244439A CN 202180019939 A CN202180019939 A CN 202180019939A CN 115244439 A CN115244439 A CN 115244439A
- Authority
- CN
- China
- Prior art keywords
- protective film
- layer
- film
- laminate
- adhesive layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/263—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer having non-uniform thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
- B32B43/003—Cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- G—PHYSICS
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- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2310/00—Treatment by energy or chemical effects
- B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
- B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
- B32B2310/0843—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation using laser
Abstract
The purpose of the present invention is to provide a laminate sheet which is less likely to have reduced suction force when the laminate sheet is bonded to a display panel. The laminate sheet comprises a 1 st protective film, a front panel and a polarizing layer laminated in this order, wherein the 1 st protective film comprises a 1 st adhesive layer on one surface of a 1 st resin film, the 1 st protective film is laminated on the front panel via the 1 st adhesive layer, the 1 st protective film is peelable from the front panel, and the height of burrs on the outer periphery of the 1 st protective film is 6.0 [ mu ] m or less.
Description
Technical Field
The present invention relates to a laminated sheet and a method for producing the same.
Background
A laminate sheet having a front panel and a polarizing layer is bonded to a display panel via an adhesive layer formed on the polarizing layer side, thereby forming a display device. In order to prevent the surface of the laminate from being contaminated or scratched during the period before the lamination, a release film is laminated on the adhesive layer, and a surface protective film is laminated on the front panel. When the laminate sheet is bonded to the display panel, the surface protective film side is first adsorbed and the laminate sheet is held. The separator is peeled off to expose the adhesive layer, and the laminate is bonded to the display panel via the adhesive layer.
The laminated sheet including the front panel and the polarizing layer is manufactured by cutting a long laminated body into a single body having a predetermined shape by a laser. In particular, when the laminate sheet has a layer obtained by curing a polymerizable liquid crystal compound, cutting by laser is more excellent in that fine cracks (for example, the length thereof is 200 μm or less) are less likely to occur at the end of the laminate sheet than cutting by a cutter. When the display device is bendable, if there is a fine crack at the end of the laminate sheet, the laminate sheet may be broken by the fine crack during bending, and therefore, it is preferable to cut the laminate sheet with a laser.
Documents of the prior art
Patent literature
Patent document 1: WO2016/158300
Disclosure of Invention
It was found that if the laminate sheet is cut with a laser, burrs (burr) are generated on the outer peripheral portion of the laminate sheet surface. This burr reduces the suction force when the laminate sheet is bonded to the display panel, and causes a problem that the laminate sheet cannot be held. The purpose of the present invention is to provide a laminated sheet that is less likely to have reduced suction force when the laminated sheet is bonded to a display panel.
[1] A laminate comprising a 1 st protective film and a polarizing layer laminated in this order,
the 1 st protective film has a 1 st adhesive layer on one side of a 1 st resin film,
the 1 st protective film is laminated on the polarizing layer via the 1 st adhesive layer,
the 1 st protective film can be peeled off from the polarizing layer,
the height of the burr of the outer peripheral part of the 1 st protective film is 6.0 μm or less.
[2] A laminate comprising a 1 st protective film, a front plate and a polarizing layer laminated in this order,
the 1 st protective film has a 1 st adhesive layer on one surface of a 1 st resin film,
the 1 st protective film is laminated on the front panel through the 1 st adhesive layer,
the 1 st protective film can be peeled off from the front panel,
the height of the burr of the outer peripheral portion of the 1 st protective film is 6.0 μm or less.
[3] The laminate sheet according to item [1] or [2], wherein the height of the burr is 0.1 μm or more.
[4] The laminate sheet according to any one of [1] to [3], wherein the polarizing layer has a layer obtained by curing a polymerizable liquid crystal compound.
[5] A method of manufacturing a laminate comprising:
a preparation step of preparing a laminate body,
the laminated body is sequentially laminated with a 2 nd protective film, a 1 st protective film and a polarizing layer,
the 1 st protective film has a 1 st adhesive layer on one side of a 1 st resin film,
the 1 st protective film is laminated on the polarizing layer via the 1 st adhesive layer,
the 2 nd protective film has a 2 nd adhesive layer on one side of a 2 nd resin film,
the 2 nd protective film is laminated on the 1 st protective film through the 2 nd pressure-sensitive adhesive layer,
the 1 st protective film can be peeled off from the polarizing layer,
the 2 nd protective film can be peeled off from the 1 st protective film; and
and a cutting step of irradiating the laminate with a laser beam from the polarizing layer side to cut the laminate into a predetermined shape, thereby obtaining a laminate sheet.
[6] A method of manufacturing a laminate sheet comprising:
a preparation step of preparing a laminate,
the laminated body is sequentially laminated with a 2 nd protective film, a 1 st protective film, a front panel and a polarizing layer,
the 1 st protective film has a 1 st adhesive layer on one side of a 1 st resin film,
the 1 st protective film is laminated on the front panel through the 1 st adhesive layer,
the 2 nd protective film has a 2 nd adhesive layer on one side of a 2 nd resin film,
the 2 nd protective film is laminated on the 1 st protective film through the 2 nd pressure-sensitive adhesive layer,
the 1 st protective film can be peeled off from the front panel,
the 2 nd protective film can be peeled from the 1 st protective film; and
and a cutting step of irradiating the laminate with a laser beam from the polarizing layer side to cut the laminate into a predetermined shape, thereby obtaining a laminate sheet.
[7] The method of [5] or [6], wherein the cutting step outputs a laser beam of 50W to 200W.
[8] The method of producing a laminated sheet according to any one of [5] to [7], wherein the cutting step cuts the laminated body into a predetermined shape by full-cut cutting.
[9] The method of producing a laminated sheet according to any one of [5] to [8], wherein the thickness of the 2 nd resin film is 40 μm or more.
[10] The method for producing a laminate sheet according to any one of [5] to [9], wherein the polarizing layer has a layer obtained by curing a polymerizable liquid crystal compound.
According to the present invention, a laminated sheet can be provided in which the suction force is not easily reduced when the laminated sheet is bonded to a display panel.
Drawings
Fig. 1 is a schematic cross-sectional view showing one example of the laminate sheet of the present invention.
Fig. 2 is a schematic cross-sectional view showing an example of the laminate sheet of the present invention.
Fig. 3 is a schematic cross-sectional view showing an example of a laminate used in the production of the laminate sheet of the present invention.
Fig. 4 is a schematic cross-sectional view showing an example of the laminate sheet of the present invention.
Fig. 5 is a schematic cross-sectional view showing an example of the laminate sheet of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments below. In all the drawings below, the scale of each component is appropriately adjusted to facilitate understanding of the component, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.
< laminated sheet >
Fig. 1 is a schematic cross-sectional view showing one example of the laminate sheet of the present invention. The laminate sheet 300 shown in fig. 1 is formed by laminating a 1 st protective film 100, a front panel 1, and a polarizing layer 2 in this order. The front panel 1 and the polarizing layer 2 are bonded by a bonding layer 3. The polarizing layer 2 has a linearly polarizing plate 20 and a retardation film 22 from the front panel 1 side. The 1 st protective film 100 corresponds to a so-called surface protective film, and has a 1 st adhesive layer 102 on one surface of a 1 st resin film 101. The 1 st protective film 100 is laminated on the front panel 1 via the 1 st adhesive layer 102. The 1 st protective film 100 can be peeled off from the front panel 1, and the 1 st adhesive layer 102 has its adhesive force adjusted so as to be peelable from the front panel 1.
Fig. 4 is a schematic cross-sectional view showing an example of the laminate sheet of the present invention. The laminate sheet 302 shown in fig. 4 is formed by laminating the 1 st protective film 100 and the polarizing layer 2 in this order. The polarizing layer 2 has a linear polarizing plate 20 and a retardation film 22 from the 1 st protective film 100 side. The 1 st protective film 100 corresponds to a so-called surface protective film, and has a 1 st adhesive layer 102 on one surface of a 1 st resin film 101. The 1 st protective film 100 is laminated on the polarizing layer 2 via the 1 st adhesive layer 102. The 1 st protective film 100 is peelable from the polarizing layer 2, and the 1 st adhesive layer 102 is peelable from the polarizing layer 2 to adjust its adhesive strength.
The laminate sheet may be provided with a 3 rd adhesive layer and a 3 rd resin film on the side of the polarizing layer opposite to the front panel side (or the 1 st protective film side). Fig. 2 and 5 are schematic cross-sectional views showing examples of laminates according to the present invention. The laminate sheet 301 shown in fig. 2 is formed by laminating a 1 st protective film 100, a front panel 1, a polarizing layer 2, a 3 rd adhesive layer 50, and a 3 rd resin film 51 in this order. The front panel 1 and the polarizing layer 2 are bonded by a bonding layer 3. The polarizing layer 2 has a linear polarizer 20 and a retardation film 22 from the front panel 1 side. The 3 rd resin film 51 may correspond to a so-called separator, and the 3 rd adhesive layer 50 may be an adhesive layer for bonding the laminate to a display panel. The 3 rd resin film 51 can be peeled from the 3 rd adhesive layer 50, and the 3 rd resin film 51 may have its surface subjected to a releasing treatment so as to be peeled from the 3 rd adhesive layer 50.
The laminate sheet 303 shown in fig. 5 is formed by laminating a 1 st protective film 100, a polarizing layer 2, a 3 rd adhesive layer 50, and a 3 rd resin film 51 in this order. The polarizing layer 2 has a linear polarizing plate 20 and a retardation film 22 from the 1 st protective film 100 side. The 3 rd resin film 51 may correspond to a so-called separator, and the 3 rd adhesive layer 50 may be an adhesive layer for bonding the laminate to a display panel. The 3 rd resin film 51 can be peeled from the 3 rd adhesive layer 50, and the 3 rd resin film 51 may be subjected to a releasing treatment on its surface to enable it to be peeled from the 3 rd adhesive layer 50.
The laminate sheet may have layers other than those shown in fig. 1 to 2 and 4 to 5. The laminate sheet may include, for example, a touch sensor layer, a colored layer formed in a frame shape in a plan view between the front panel 1 and the polarizing layer 2, an impact-resistant film disposed between the front panel 1 and the polarizing layer 2, a resin film, and the like.
The height of burrs at the outer peripheral portion of the 1 st protective film of the laminate sheet of the present invention is 6.0 μm or less. The flash may be a residue on the outside of the geometry of the corner edge of the laminate, and may be a residue on the laminate after machining or forming. Specifically, the burr may be a melt-solidified material of the laminate sheet (particularly, the material of the 1 st protective film) present on the surface of the 1 st protective film opposite to the 1 st pressure-sensitive adhesive layer side and on the outer peripheral portion thereof. Burrs can be produced by laser machining. The burr may be present on at least a part of the entire periphery of the outer peripheral portion of the 1 st protective film in a plan view, or may be present on the entire periphery of the outer peripheral portion.
In fig. 1, the burr 40 is present on the surface of the 1 st protective film 100 opposite to the 1 st pressure-sensitive adhesive layer 102 side surface and in the outer peripheral portion thereof in a plan view. The height of the burr corresponds to the height indicated by the reference numeral 41.
By setting the height of the burr of the outer peripheral portion of the 1 st protective film to 6.0 μm or less, the gap between the laminate sheet and the adsorption device can be reduced. Therefore, it is estimated that the force of sucking the laminate sheet is not easily reduced. Therefore, the height of the burr is preferably 2.0 μm or less, more preferably 1.5 μm or less, further preferably 1.0 μm or less, and may be 0.7 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, or 0.3 μm or more. If the height of the burrs is within the above range, it is easy to prevent a problem (multiple removal) that a plurality of laminated sheets are removed when the uppermost laminated sheet is removed from a laminated sheet laminate formed by laminating a plurality of laminated sheets.
The height of the burr was measured by using a stylus type film thickness meter. The stylus type film thickness meter includes, for example, DEKTAK32 (manufactured by VEECO corporation).
The laminate sheet may also have burrs on the surface on the side opposite to the 1 st protective film side. Specifically, the burr may be present on the surface of the 3 rd resin film opposite to the 3 rd adhesive layer side and the outer peripheral portion thereof. The burr may be an object in which a material constituting the laminate sheet (particularly, a material of the 3 rd resin film) is melt-solidified. The height of the burrs present on the surface opposite to the 1 st protective film may be more than 0 μm and not more than 100 μm, or may be larger than the height of the burrs on the outer peripheral portion of the 1 st protective film.
The laminated film including the front panel 1 and the polarizing layer 2 constituting the laminated sheet is preferably bendable at least In a direction (so-called In-folding) mode) In which the front panel 1 is inside and the polarizing layer 2 is outside. The bendable state means that the panel 1 can be bent in a direction inside and outside the polarizing layer 2 without breaking.
In another embodiment, the laminated film constituting the laminated sheet and including the polarizing layer 2 is preferably bendable at least In a direction (so-called In-folding) mode) In which the linearly polarizing plate 20 is inside and the retardation film 22 is outside. The term "bendable" means that the film can be bent without breaking in a direction in which the linearly polarizing plate 20 is located inside and the retardation film 22 is located 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 rectangle. When the shape of the laminate sheet in the plane direction is rectangular, the length of the long side may be, for example, 10mm to 1400mm, preferably 50mm to 600mm. The length of the short side is, for example, 5mm to 800mm, preferably 30mm to 500mm, and more preferably 50mm to 300mm. Each layer constituting the laminate sheet may be subjected to R processing for the corner portions, or to slit processing for the end portions, or to hole forming.
The thickness of the laminate is not particularly limited, and is, for example, 20 to 1000 μm, preferably 50 to 500 μm, because it varies depending on the function required for the laminate, the application of the laminate, and the like.
[1 st protective film ]
The 1 st protective film corresponds to a so-called surface protective film, and one surface of the 1 st resin film has a 1 st adhesive layer. The 1 st protective film is laminated on the front panel via the 1 st pressure-sensitive adhesive layer. In general, for example, after the laminate sheet is bonded to a display panel or another optical member, the 1 st protective film is peeled off together with the 1 st adhesive layer included therein. Therefore, the 1 st protective film can be peeled off from the front panel, and the 1 st adhesive layer is adjusted in its adhesive force in such a manner as to be peelable from the front panel.
In another embodiment, the 1 st protective film is laminated on the polarizing layer via the 1 st adhesive layer. In general, for example, after the lamination sheet is attached to a display panel or other optical member, the 1 st protective film is peeled off together with the 1 st adhesive layer. Therefore, the 1 st protective film can be peeled off from the polarizing layer, and the 1 st adhesive layer can adjust its adhesive force so as to be peelable from the polarizing layer.
The thickness of the 1 st protective film may be, for example, 30 to 200 μm, or 50 to 150 μm. The thickness of the 1 st protective film is the thickness of the central portion (not the outer peripheral portion) of the laminate sheet.
[1 st resin film ]
The resin constituting the first resin film 1 may be, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, or a thermoplastic resin such as a polycarbonate resin. Polyester resins such as polyethylene terephthalate are preferred. The 1 st resin film may have a single-layer structure or a multilayer structure, and is preferably a single-layer structure from the viewpoints of ease of production, production cost, and the like.
The thickness of the 1 st resin film may be, for example, 20 to 200 μm, or 30 to 150 μm. The thickness of the 1 st resin film is the thickness of the central portion (not the outer peripheral portion) of the laminate sheet.
[1 st adhesive layer ]
The 1 st pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic, rubber, urethane, ester, silicone or polyvinyl ether resin as a main component. Among them, preferred is an adhesive composition containing a (meth) acrylic resin as a base polymer, which is excellent in transparency, weather resistance, heat resistance and the like. The adhesive composition may be an active energy ray-curable type or a thermosetting type.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, for example, a polymer or copolymer in which 1 or 2 or more kinds of (meth) acrylic esters such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are used as monomers is preferably used. The base polymer may be copolymerized with a polar monomer. Examples of the polar monomer include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N-dimethylaminoethyl (meth) acrylate, and glycidyl (meth) acrylate.
The adhesive composition may comprise a crosslinking agent. Examples of the crosslinking agent include a metal ion having a valence of 2 or more and forming a metal salt of carboxylic acid with a carboxyl group, a polyamine compound forming an amide bond with a carboxyl group, a polyepoxy compound or polyol forming an ester bond with a carboxyl group, and a polyisocyanate compound forming an amide bond with a carboxyl group. Among them, polyisocyanate compounds are preferable.
The binder composition may contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer, adhesion-imparting agents, fillers (metal powders, other inorganic powders, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, anticorrosive agents, and photopolymerization initiators for imparting light scattering properties.
The adhesive composition can be formed by applying a diluted solution of the above adhesive composition in an organic solvent to a substrate and drying the applied solution.
The thickness of the 1 st adhesive layer is preferably 5 μm or more, more preferably 10 μm or more. The upper limit of the thickness of the 1 st pressure-sensitive adhesive layer is not particularly limited, and may be 50 μm or less, or 40 μm or less.
[ front panel ]
The front panel 1 may be a layer constituting the outermost surface of the display device as viewed from the viewer side. The front panel 1 is not limited in material and thickness as long as it is a plate-like body that transmits light, and may be formed of only 1 layer, or 2 or more layers. Examples thereof include a resin film and a glass film. The front panel preferably has a resin film. The front panel 1 may be a laminate of a resin film and a glass film.
The thickness of the front panel 1 may be, for example, 30 to 200. Mu.m, preferably 50 to 150. Mu.m, and more preferably 50 to 100. Mu.m.
When the front panel 1 has a resin film, examples of the material include acrylic resins 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 resins such as ethylene-vinyl acetate copolymers, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, and polyvinyl acetal; sulfone resins such as polysulfone and polyethersulfone; ketone resins such as polyether ketone and polyether ether ketone; a polyetherimide; a polycarbonate-based resin; a polyester resin; a polyimide resin; a polyamide imide resin; and polyamide resins. These polymers may be used alone or in combination of 2 or more. Among them, from the viewpoint of improving strength and transparency, a polycarbonate-based resin, a polyester-based resin, a polyimide-based resin, a polyamideimide-based resin, or a polyamide-based resin is preferably used.
The thickness of the resin film may be, for example, 10 to 100. Mu.m, preferably 20 to 70 μm, and more preferably 30 to 60 μm.
The front panel 1 may be a film having a hard coat layer provided on at least one surface of a resin film to further increase the hardness. The hard coat layer may be formed on one surface of the resin film or on both surfaces. A front panel having improved hardness and scratch resistance can be manufactured by providing a hard coating layer. The hard coat layer is a cured layer of, for example, an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, polyurethane resins, amide resins, and epoxy resins. The hard coating may contain additives for increasing hardness. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof.
The hard coat layer is preferably formed on the visually recognized side thereof with a wear-resistant layer to improve wear resistance or to prevent contamination such as sebum. The front panel may have an abrasion resistant layer, and the abrasion resistant layer may be a layer constituting a viewing side surface of the front panel. The abrasion resistant layer comprises a structure derived from a fluorine compound. The fluorine compound is preferably a compound having a silicon atom and a hydrolyzable group such as an alkoxy group or a halogen on the silicon atom. The coating film can be formed by a dehydration condensation reaction of the hydrolyzable group, and the adhesion of the abrasion resistant layer can be improved by a reaction with active hydrogen on the surface of the substrate. Further, the fluorine compound is preferable because it can impart water repellency when it has a perfluoroalkyl group or a perfluoropolyether structure. Particularly preferred is a fluorine-containing polyorganosiloxane compound having a perfluoropolyether structure and a long-chain alkyl group having 4 or more carbon atoms. As the fluorine compound, 2 or more kinds of compounds are also preferably used. The fluorine compound preferably further contains a fluorine-containing organosiloxane compound containing an alkylene group having 2 or more carbon atoms and a perfluoroalkylene group.
The thickness of the abrasion resistant layer is, for example, 1nm to 20nm. 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 were about 3 to 20 degrees and about 2 to 55 degrees, respectively. The abrasion resistant layer may contain various additives such as a silanol condensation catalyst, an antioxidant, a rust inhibitor, an ultraviolet absorber, a light stabilizer, a fungicide, an antibacterial agent, an anti-biofouling agent, a deodorant, a pigment, a flame retardant, and an antistatic agent, in a range not to impair the effects of the present invention.
A primer layer may also be disposed between the mar resistant layer and the hard coat layer. Examples of the primer include ultraviolet-curable, thermosetting, moisture-curable, and 2-liquid-curable epoxy compounds. Further, as the primer agent, polyamic acid can be used, and a silane coupling agent is preferably used. The thickness of the primer layer is, for example, 0.001 to 2 μm.
As a method for obtaining a front panel including an abrasion-resistant layer and a hard coat layer, it can be formed by applying a primer agent on the hard coat layer as needed, drying and curing the primer agent to form a primer layer, then applying a composition including a fluorine compound (abrasion-resistant layer coating composition), and drying the composition. 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 coating method. In addition, it is also preferable to subject the coated surface to hydrophilization treatment such as plasma treatment, corona treatment, or ultraviolet treatment before coating the primer agent or the abrasion resistant layer coating composition. The laminate may be directly laminated on the front panel, or a laminate laminated on another transparent substrate may be bonded to the front panel using an adhesive or a bonding agent.
When the front panel 1 has a glass film, a strengthened glass for display is preferably used as the glass film. The thickness of the glass film may be, for example, 10 to 500 μm, or 20 to 100 μm. The front panel 1 having excellent mechanical strength and surface hardness can be constituted by using a glass film.
When the laminate sheet is used in a display device, the front panel 1 may function as a window film of the display device. The front panel 1 may further have a function as a touch sensor, a blue light cut-off function, a viewing angle adjustment function, and the like.
[ polarizing layer ]
The polarizing layer may have a linear polarizer and a retardation film from the side close to the front panel. The polarizing layer may be a circular polarizer (including an elliptical polarizer). Since the circularly polarizing plate can absorb external light reflected by the display device, the laminated sheet can be provided with a function as an antireflection film. The polarizing layer preferably has a layer obtained by curing a polymerizable liquid crystal compound. According to the present invention, the layer obtained by curing the polymerizable liquid crystal compound is provided, but the height of the burr can be reduced to improve the flexibility.
[ Linear polarizing plate ]
The linearly polarizing plate has a function of selectively transmitting linearly polarized light in one direction of unpolarized light rays such as natural light. The linearly polarizing plate may include, as the polarizer, a stretched film or a stretched layer having a dichroic dye adsorbed thereon, a liquid crystal layer containing a cured product of a polymerizable liquid crystal compound and a dichroic dye, the dichroic dye being dispersed and oriented in a layer obtained by curing the polymerizable liquid crystal compound, and the like. The linearly polarizing plate using a liquid crystal layer as a polarizer is preferable because the bending direction is not limited as compared with a stretched film or a stretched layer having a dichroic dye adsorbed thereon.
(polarizer as stretched film or stretched layer having dichroic dye adsorbed thereon)
The polarizer as the stretched film having the dichroic dye adsorbed thereon can be generally produced through a step of uniaxially stretching a polyvinyl alcohol resin film, a step of adsorbing the dichroic dye by dyeing the polyvinyl alcohol resin film with a dichroic dye such as iodine, a step of treating the polyvinyl alcohol resin film having the dichroic dye adsorbed thereon with an aqueous boric acid solution, and a step of washing the polyvinyl alcohol resin film with water after the treatment with the aqueous boric acid solution.
The thickness of the polarizer is usually 30 μm or less, preferably 18 μm or less, and more preferably 15 μm or less. Making the thickness of the polarizer thin is advantageous for thinning the laminate. The thickness of the polarizer is usually 1 μm or more, and for example, may be 5 μm or more.
The polyvinyl alcohol resin is obtained by saponifying a polyvinyl acetate 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 another monomer copolymerizable therewith may be used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group.
The saponification degree of the polyvinyl alcohol resin is usually about 85 mol% to 100 mol%, and preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and polyvinyl formal, polyvinyl acetal, or the like modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol resin is usually 1000 to 10000, preferably 1500 to 5000.
The polarizer as the stretched layer having the dichroic dye adsorbed thereon can be usually produced through a step of applying a coating liquid containing the above-mentioned polyvinyl alcohol resin onto a base film, a step of uniaxially stretching the resulting laminate film, a step of producing a polarizer by dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminate film with the dichroic dye and allowing the layer to adsorb the dichroic dye, a step of treating the film having the dichroic dye adsorbed thereon with an aqueous boric acid solution, and a step of washing the film with water after the treatment with the aqueous boric acid solution. The substrate film for forming the polarizer may also be used as a protective layer for the polarizer. The substrate film may be peeled off from the polarizer as required. The material and thickness of the base film may be the same as those of the resin film described later.
The polarizer as a stretched film or a stretched layer having a dichroic dye adsorbed thereon may be used as it is as a linear polarizing plate, or a linear polarizing plate obtained by laminating a resin film on one or both surfaces thereof. The thickness of the linearly polarizing plate is preferably 2 μm to 40 μm.
Examples of the resin film include a cyclic polyolefin resin film; cellulose acetate resin films made of resins such as triacetyl cellulose and diacetyl cellulose; polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; a polycarbonate-based resin film; a (meth) acrylic resin film; and films known in the art such as polypropylene resin films. The polarizer and the protective layer may be laminated via a lamination 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, further preferably 40 μm or less, further preferably 30 μm or less, and usually 10 μm or more, and preferably 15 μm or more from the viewpoint of improving the laser light absorption rate.
A hard coat layer may also be formed on the resin film. The hard coat layer may be formed on one surface of the resin film or on both surfaces thereof. By providing the hard coat layer, a thermoplastic resin film having improved hardness and scratch resistance can be produced. The hard coat layer may be formed in the same manner as the hard coat layer formed on the resin film.
(polarizer as 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 participating in a polymerization reaction, and is preferably a photopolymerizable reactive group. The photopolymerizable reactive group means a group that can participate in a polymerization reaction by an active radical, an acid, or the like generated from a photopolymerization initiator. Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chloroethenyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxetanyl group, and the like. Among them, preferred are acryloyloxy, methacryloyloxy, vinyloxy, oxetanyl and oxetanyl, and more preferred is acryloyloxy. The type of the polymerizable liquid crystal compound is not particularly limited, and a rod-like liquid crystal compound, a discotic liquid crystal compound, and a mixture thereof can be used. The liquid crystallinity of the polymerizable liquid crystal compound may be thermotropic liquid crystal or lyotropic liquid crystal, and the phase sequence structure may be nematic liquid crystal or smectic liquid crystal.
The dichroic dye used for the polarizer as the liquid crystal layer preferably has a maximum absorption wavelength (λ MAX) in the range of 300 to 700 nm. Examples of such a dichroic dye include acridine dye, and,
Oxazine pigments, cyanine pigments, naphthalene pigments, azo pigments, anthraquinone pigments, and the like, and among them, azo pigments are preferable. Examples of the azo dye include monoazo dye, disazo dye, trisazo dye, tetraazo dye, and stilbene azo dye, and disazo dye and trisazo dye are preferable. The dichroic dye may be used alone or in combination of 2 or more, preferably 3 or more. In particular, a combination of 3 or more azo compounds is more preferable. A part of the dichroic dye may have a reactive group or may have liquid crystallinity.
The polarizer as the liquid crystal layer can be formed, for example, by applying a composition for polarizer formation containing a polymerizable liquid crystal compound and a dichroic dye to an alignment film formed on a base film, and polymerizing and curing the polymerizable liquid crystal compound. The substrate film for forming the polarizer may also be used as a protective layer for the polarizer. The material and thickness of the base film may be the same as those of the resin film.
Examples of the composition for forming a polarizer comprising a polymerizable liquid crystal compound and a dichroic dye and the method for producing a polarizer using the composition include those described in jp 2013-37353 a, jp 2013-33249 a, and jp 2017-83843 a. 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 in addition to the polymerizable liquid crystal compound and the dichroic dye. These components may be used alone in 1 kind, or 2 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 the polymerization reaction of the polymerizable liquid crystal compound, and a photopolymerization initiator is preferable in that the polymerization reaction can be initiated at a lower temperature. Specifically, there may be mentioned photopolymerization initiators capable of generating active radicals or acids by the action of light, and among them, photopolymerization initiators capable of generating radicals by the action of light are preferred. The content of the polymerization initiator is preferably 1 to 10 parts by mass, and more preferably 3 to 8 parts by mass, based on 100 parts by mass of the total amount of the polymerizable liquid crystal compound. When the amount is within this range, the reaction of the polymerizable group proceeds sufficiently, and the alignment state of the liquid crystal compound is easily stabilized.
The thickness of the polarizer as the liquid crystal layer is usually 10 μm or less, preferably 0.5 to 8 μm, and more preferably 1 to 5 μm.
The polarizer as the liquid crystal layer may be used as a linear polarizer without peeling and removing the substrate film, or the substrate film may be peeled and removed from the polarizer layer to be used as a linear polarizer. The polarizer as a liquid crystal layer may be used as a linear polarizer by forming a protective layer on one or both surfaces thereof. As the protective layer, the above resin film can be used.
The polarizer as the liquid crystal layer may have an overcoat layer on one or both surfaces of the polarizer for the purpose of protecting the polarizer and the like. The overcoat layer can be formed, for example, by coating the material (composition) for forming the overcoat layer on the polarizer. Examples of the material constituting the overcoat layer include photocurable resins and water-soluble polymers. As a material constituting the overcoat layer, a (meth) acrylic resin, a polyvinyl alcohol resin, or the like can be used.
[ phase difference film ]
The retardation film included in the polarizing layer may be composed of 1 retardation layer or a laminate of 2 or more retardation layers. The retardation film preferably includes a retardation layer including a layer obtained by curing a polymerizable liquid crystal compound. In the case where the retardation film is a laminate of 2 retardation layers, it is preferable that any one of the retardation layers is a retardation layer including a layer obtained by curing a polymerizable liquid crystal compound. The retardation film is laminated on the side opposite to the front panel side (or the 1 st protective film side) of the polarizer. The retardation film may have an overcoat layer for protecting the surface thereof, a substrate film for supporting the retardation film, and the like.
The retardation film preferably includes a λ/4 layer as a retardation layer, and may further include at least one of a λ/2 layer and a positive C layer. The phase difference layer may have an alignment film. When the retardation film has a retardation layer as a λ/2 layer, the λ/2 layer and the λ/4 layer may be laminated in this order from the polarizer side. When the retardation film includes a retardation layer as a positive C layer, the λ/4 layer and the positive C layer may be stacked in this order from the polarizer side, or the positive C layer and the λ/4 layer may be stacked in this order from the polarizer side.
The thickness of the retardation layer is, for example, 0.1 to 10 μm, preferably 0.5 to 8 μm, and more preferably 1 to 6 μm.
The retardation layer may be formed of a resin film exemplified as a material of the protective layer, or may be formed of a layer obtained by curing a polymerizable liquid crystal compound. The retardation layer may further include an alignment film. The phase difference film may have a lamination layer for laminating the λ/4 layer with the λ/2 layer and the positive C layer. As described later, the adhesive layer may be formed of an adhesive layer or an adhesive layer.
When the polymerizable liquid crystal compound is cured to form the retardation layer, the retardation layer can be formed by applying a composition containing the polymerizable liquid crystal compound to a substrate film and curing the composition. An alignment film may be formed between the substrate film and the coating layer. The material and thickness of the base film may be the same as those of the resin film described above. When the retardation layer is formed from a layer obtained by curing a polymerizable liquid crystal compound, the retardation layer may be incorporated in the laminate sheet in a form having an alignment film and a base film. The retardation layer may be bonded to the linearly polarizing plate via a bonding layer.
[ touch sensor layer ]
The touch sensor layer may further include a resin film, and may include at least a transparent conductive layer. The touch sensor layer may include a transparent conductive layer and a resin film in this order from the front panel side (or the 1 st protective film side). The touch sensor layer may include a resin film and a transparent conductive layer in this order from the front panel side (or the 1 st protective film side). The touch sensor layer may also be free of a resin film. The touch sensor layer may include a separation layer, a bonding layer, and a protective layer in addition to the transparent conductive layer and the resin film.
The touch sensor layer is not limited as long as it is a sensor that can detect a position touched on the surface of the display device and has a configuration having a transparent conductive layer. Examples of the detection method of the touch sensor layer include a resistive film method, a capacitive method, an optical sensor method, an ultrasonic wave method, an electromagnetic induction coupling method, a surface acoustic wave method, and the like. Among them, a touch sensor layer of an electrostatic capacitance system is preferably used in terms of low cost, high response speed, and thin film.
The transparent conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or may be a metal layer made of a metal such as aluminum, copper, silver, gold, or an alloy thereof.
The separation layer may be a layer which is formed over a substrate such as glass and which is used to separate a transparent conductive layer formed over 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 for 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, or the like can be used.
[3 rd adhesive layer ]
The 3 rd adhesive layer may be an adhesive layer for bonding the laminate to a display panel or the like. The 3 rd adhesive layer may be composed of the same adhesive composition as the 1 st adhesive layer. The thickness of the 3 rd adhesive layer is preferably 10 μm or more, more preferably 20 μm or more. The upper limit of the thickness of the 1 st pressure-sensitive adhesive layer is not particularly limited, and may be 50 μm or less, or 40 μm or less.
[3 rd resin film ]
The 3 rd resin film is a film for protecting the surface of the 3 rd adhesive layer before the adhesive layer is bonded to the display panel or another optical member and temporarily adhering the same. The 3 rd resin film may be a so-called separator. The 3 rd resin film is generally formed of a resin film whose one surface is subjected to a releasing treatment with a releasing agent such as a silicone-based or fluorine-based releasing agent, and the releasing treated surface thereof is bonded to the 3 rd adhesive layer.
Examples of the resin constituting the 3 rd resin film include the same resins as those constituting the 1 st resin film. The resin constituting the 3 rd resin film is preferably a polyester resin such as polyethylene terephthalate. The 3 rd resin film may have a single-layer structure or a multilayer structure, and is preferably a single-layer structure from the viewpoint of ease of production, production cost, and the like. The thickness of the 3 rd resin film may be, for example, 20 to 100 μm, or 30 to 80 μm.
[ adhesive layer ]
The laminated layer may be a layer for laminating the respective layers, and may be a layer made of an adhesive or a bonding agent. The laminated layers may be made of 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 with an adhesive layer or may be bonded to each other with an adhesive layer. Preferably, the linearly polarizing plate and the retardation film are bonded to each other with an adhesive layer.
As the pressure-sensitive adhesive layer constituting the bonding layer, the same pressure-sensitive adhesive layer as the 1 st pressure-sensitive adhesive layer or the 3 rd pressure-sensitive adhesive layer described above can be used.
The adhesive may be formed by combining 1 or 2 or more kinds of water-based adhesives, active energy ray-curable adhesives, and the like. Examples of the aqueous adhesive include a polyvinyl alcohol resin aqueous solution and an aqueous two-pack polyurethane emulsion adhesive. The active energy ray-curable adhesive is an adhesive that is cured by irradiation with an active energy ray such as ultraviolet ray, and examples thereof include an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, and an adhesive containing a binder resin and a photoreactive crosslinking agent. Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from these monomers. Examples of the photopolymerization initiator include compounds containing active species that generate neutral radicals, anionic radicals, and cationic radicals upon irradiation with active energy rays such as ultraviolet rays.
When the adhesive layer is an adhesive layer, the thickness of the adhesive layer is preferably 1 to 30 μm, more preferably 2 to 20 μm, 3 to 10 μm. When the adhesive layer is an adhesive layer, the thickness of the adhesive layer is preferably 0.01 to 5 μm, more preferably 0.1 to 3 μm.
< method for producing laminated sheet >
The method for manufacturing a laminate sheet includes: a preparation step of preparing a laminate, and a cutting step of obtaining a laminate sheet from the laminate. The method for manufacturing the laminate sheet may include a peeling step of peeling the 2 nd protective film.
The laminate prepared in the preparation step has a 2 nd protective film, a 1 st protective film, a front panel, and a polarizing layer laminated in this order. The 1 st protective film has a 1 st adhesive layer on one surface of the 1 st resin film, and the 1 st protective film is laminated on the front panel via the 1 st adhesive layer. The 2 nd protective film has a 2 nd adhesive layer on one surface of the 2 nd resin film, and the 2 nd protective film is laminated on the 1 st protective film via the 2 nd adhesive layer. The 1 st protective film can be peeled off from the front panel, and the 2 nd protective film can be peeled off from the 1 st protective film. The laminate may have layers (a 3 rd adhesive layer, a 3 rd resin film, a touch sensor layer, a colored layer, an impact-resistant film, a resin film, and the like) that the laminate sheet may have. The laminate may be long or a single sheet having a predetermined size. The 1 st protective film, the front panel and the polarizing layer may use the 1 st protective film, the front panel and the polarizing layer described above.
In another embodiment, the laminate prepared in the preparation step is formed by sequentially laminating a 2 nd protective film, a 1 st protective film, and a polarizing layer. The 1 st protective film has a 1 st adhesive layer on one surface of the 1 st resin film, and the 1 st protective film is laminated on the polarizing layer via the 1 st adhesive layer. The 2 nd protective film has a 2 nd adhesive layer on one surface of the 2 nd resin film, and the 2 nd protective film is laminated on the 1 st protective film via the 2 nd adhesive layer. The 1 st protective film can be peeled from the polarizing layer, and the 2 nd protective film can be peeled from the 1 st protective film. The laminate may have layers (a 3 rd adhesive layer, a 3 rd resin film, a touch sensor layer, a colored layer, an impact-resistant film, a resin film, and the like) that the laminate sheet may have. The laminate may be long or a single sheet having a predetermined size. The 1 st protective film and the polarizing layer may use the 1 st protective film and the polarizing layer described above.
The laminate 400 shown in fig. 3 is formed by laminating a 2 nd protective film 200, a 1 st protective film 100, a front panel 1, and a polarizing layer 2 in this order. The 1 st protective film 100 has a 1 st adhesive layer 102 on one surface of a 1 st resin film 101. The 1 st protective film 100 is laminated on the front panel 1 via the 1 st pressure-sensitive adhesive layer 102. The 2 nd protective film 200 has a 2 nd adhesive layer 202 on one surface of a 2 nd resin film 201. The 2 nd protective film 200 is laminated on the 1 st protective film 100 via the 2 nd pressure-sensitive adhesive layer 202. The 1 st protective film 100 can be peeled off from the front panel 1, and the 2 nd protective film 200 can be peeled off from the 1 st protective film 100.
[2 nd protective film ]
The 2 nd protective film corresponds to a so-called surface protective film, and one surface of the 2 nd resin film has a 2 nd adhesive layer. The 2 nd protective film is laminated on the 1 st protective film via the 2 nd adhesive layer. After the cutting step of obtaining a laminate from the laminate, the 2 nd protective film is peeled and removed together with the 2 nd adhesive layer included therein. Therefore, the 2 nd protective film can be peeled from the 1 st protective film, and the 2 nd adhesive layer is adjusted in its adhesive force so as to be peelable from the 1 st protective film.
The adhesion force of the 2 nd protective film to the 1 st protective film is preferably smaller than the adhesion force of the 1 st protective film to the front panel. In another embodiment, the adhesion force of the 2 nd protective film to the 1 st protective film is preferably smaller than the adhesion force of the 1 st protective film to the polarizing layer. When the 2 nd protective film is peeled off, the 1 st protective film is not easily peeled off inadvertently.
The thickness of the 2 nd protective film may be, for example, 30 to 200 μm, or 40 to 150 μm.
[2 nd resin film ]
Examples of the resin constituting the 2 nd resin film include the same resins as those constituting the 1 st resin film. The resin constituting the 2 nd resin film is preferably a polyester resin such as polyethylene terephthalate. The 2 nd resin film may have a single-layer structure or a multilayer structure, and is preferably a single-layer structure from the viewpoint of ease of production, production cost, and the like. The thickness of the 2 nd resin film may be, for example, 20 to 100 μm, 30 to 80 μm, or 40 μm or more.
[2 nd adhesive layer ]
The 2 nd adhesive layer may be composed of the same adhesive composition as the 1 st adhesive layer. The thickness of the 2 nd adhesive layer is preferably 3 μm or more, and more preferably 5 μm or more. The upper limit of the thickness of the 1 st pressure-sensitive adhesive layer is not particularly limited, and may be 50 μm or less, or 40 μm or less.
The laminate is produced by laminating the layers on each other, and the order of laminating the layers is not particularly limited. The laminate is obtained, for example, by a manufacturing method including a step of laminating a front panel and a polarizing layer, a step of laminating a 1 st protective film on the front panel, and a step of laminating a 2 nd protective film on the 1 st protective film. In another embodiment, the laminate is obtained, for example, by a manufacturing method including a step of laminating a 1 st protective film on the polarizing layer and a step of laminating a 2 nd protective film on the 1 st protective film.
The cutting step of obtaining a laminated sheet from the laminate is performed by irradiating the laminate with a laser beam from the polarizing layer side (from the side opposite to the viewing side) to cut the laminate into a predetermined shape. That is, the surface on the laser light emission side is formed of the 2 nd protective film. By providing the laminate with the 2 nd protective film, the 1 st protective film is not a layer constituting the outermost surface of the laminate but a layer present inside the laminate. The outer peripheral portion of the laser light emission-side surface is more likely to form a relatively large burr than the outer peripheral portion of the layer present inside the laminate. Therefore, by providing the 2 nd protective film to the laminate, the height of the burrs at the outer peripheral portion of the 1 st protective film can be easily made 6.0 μm or less.
As the laser light, for example, laser light that radiates light having a wavelength included in the range of 200nm to 11 μm is used. The laser may be a Continuous Wave (CW) laser or a pulsed laser. The type of laser includes CO 2 Gas laser such as laser, solid laser such as YAG laser, and semiconductor laser. CO is preferred because of its ease of adaptation to the absorption region of the laminate 2 And (4) laser.
The height of the burr of the outer peripheral portion of the 1 st protective film is likely to be small when the output of the laser light is large. Using CO 2 In the case of a laser, the output of the laser is preferably 50W or more, more preferably 60W or more, and still more preferably 100W or more. The upper limit of the output of the laser beam is not particularly limited, and may be 200W or less, for example.
From the same viewpoint, the energy of the laser light irradiated in scanning of a unit step (hereinafter, may be referred to as irradiation energy) is preferably 100mJ/mm or more, more preferably 200mJ/mm or more, and still more preferably 250mJ/mm or more. The upper limit of the irradiation energy is not particularly limited, and may be, for example, 1000mJ/mm or less and 500mJ/mm or less.
The speed at which the laser beam moves on the surface of the laminate (hereinafter, may be referred to as a moving speed) is preferably 50 mm/sec to 2000 mm/sec, more preferably 100 mm/sec to 1000 mm/sec, still more preferably 150 mm/sec to 700 mm/sec, and may be 300 mm/sec or more.
When the laser light is focused by the lens, the focal point of the laser light may be directed to the surface of the laminate on the polarizing layer side, the surface of the 2 nd protective film side, or the inside of the laminate. The spot size of the laser light may be 5 μm to 100 μm, and may be 10 μm to 70 μm. The depth of Focus (DOF) of the lens may be 10 μm to 500 μm, and may be 100 μm to 300 μm.
The cutting step may be performed by full cutting, or may be performed by cutting into the laminate by half cutting to a depth at which the laminate is not cut, and then irradiating the laminate with the laser beam 1 or more times to completely cut the laminate. The full dicing is to cut all layers in the stacking direction by 1 laser irradiation. From the viewpoint of reducing the height of the burrs on the outer peripheral portion of the 1 st protective film, the cutting step is preferably performed by full-cut cutting.
The method for manufacturing the laminate sheet may include a peeling step of peeling the 2 nd protective film. The laminate sheet in which the 1 st protective film, the front panel, and the polarizing layer are laminated in this order can be obtained by peeling off the 2 nd protective film. In another embodiment, a laminate sheet in which the 1 st protective film and the polarizing layer are sequentially laminated can be obtained by peeling the 2 nd protective film.
< display device >
The display device is obtained by holding the laminate by adsorbing the 1 st protective film, peeling the 3 rd resin film to expose the adhesive layer, and bonding the laminate to the panel via the adhesive layer. The laminate sheet is particularly preferably used for a display surface of a flexible display panel. The display panel may be configured to be foldable with the viewing side surface facing inward, or may be configured to be rollable. 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 portable device such as a smart phone and a tablet, a television, a digital photo frame, an electronic signboard, a detector, an instrument, an office device, a medical instrument, a computer device, and the like.
Examples
The present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. In the present example, the unit "part" of the ratio of the compounding materials is based on weight unless otherwise specified.
[ measurement of the height of burrs ]
The film thickness was measured by using a stylus type film thickness meter (DEKTAK 32, manufactured by VEECO). The height of the burr was measured at 11 positions included in a range of 60mm along the end edge of the laminate sheet, and the average value was determined. The same operation was repeated 5 times, and the average value thereof was taken as the height of the burr.
[1 st protective film ]
A surface protective film was prepared in which an acrylic pressure-sensitive adhesive layer (thickness: 10 μm) was formed on one surface of a polyethylene terephthalate film (thickness: 125 μm).
[2 nd protective film ]
A surface protection film having an acrylic pressure-sensitive adhesive layer (thickness: 6 μm) formed on one surface of a polyethylene terephthalate film (thickness: 50 μm) was prepared.
[3 rd resin film ]
A polyethylene terephthalate film subjected to mold release treatment, i.e., a separator film, was prepared.
[ front panel ]
As the front panel, a laminate in which a hard coat layer is formed on one surface of a Polyimide (PI) film is used. The thickness of the polyimide film was 50 μm, and the thickness of the hard coat layer was 10 μm.
[ circularly polarizing plate ]
An alignment film is formed on one surface of a triacetyl cellulose (TAC) film. A composition having a polymerizable liquid crystal compound and a dichroic dye is coated on an alignment film. The coating film is oriented and cured to obtain the polarizer. An ultraviolet-curable resin is coated on the polarizer. The coating film is cured to form an overcoat. Thus, a linearly polarizing plate was obtained. The thickness of the TAC film is 25 μm, the thickness of the polarizer is 2.5 μm, and the thickness of the overcoat is 1.0 μm. The polarizer is obtained by dispersing and aligning a dichroic dye in a layer obtained by curing a polymerizable liquid crystal compound.
As the retardation layer, a λ/4 layer having a layer obtained by curing a polymerizable liquid crystal compound and a positive C layer having a layer obtained by curing a polymerizable liquid crystal compound were prepared. The two were bonded with an ultraviolet-curable adhesive to prepare a retardation film.
The linearly polarizing plate and the retardation film were laminated with an acrylic pressure-sensitive adhesive layer to obtain a circularly polarizing plate. The retardation film is laminated on the top-layer side of the linearly polarizing plate. The absorption axis of the polarizer makes an angle of 45 ° with the slow axis of the λ/4 layer.
Examples 1 to 4 and comparative example 2
The front plate and the circularly polarizing plate were laminated to each other via an acrylic pressure-sensitive adhesive layer. The thickness of the acrylic adhesive layer was 25 μm. The front panel is laminated on the TAC film side of the circularly polarizing plate. An acrylic pressure-sensitive adhesive layer is laminated on the retardation film provided in the circularly polarizing plate, and a 3 rd resin film is further laminated thereon.
The 1 st protective film is laminated on the front panel via the adhesive layer provided on the 1 st protective film. The 2 nd protective film is laminated on the 1 st protective film via the adhesive layer provided in the 2 nd protective film. Thus, a laminate was produced in which the 2 nd protective film, the 1 st protective film, the front panel, the circularly polarizing plate, the 3 rd adhesive layer, and the 3 rd resin film were laminated in this order. The 1 st protective film can be peeled off from the front panel, and the 2 nd protective film can be peeled off from the 1 st protective film.
The laminate was irradiated with a laser under the conditions shown in table 1, and the laminate was cut into a predetermined shape (20 mm in the vertical direction × 100mm in the horizontal direction), thereby obtaining a laminate sheet. The 2 nd protective film was peeled off, and the height of burrs was measured at the outer peripheral portion of the 1 st protective film. The results are shown in Table 1.
[ examples 5 to 6]
An acrylic pressure-sensitive adhesive layer and a 3 rd resin film are laminated on the retardation film provided in the circularly polarizing plate. The 1 st protective film is laminated on the circularly polarizing plate via the adhesive layer provided on the 1 st protective film. The adhesive layer included in the 1 st protective film was laminated on the TAC film side of the circularly polarizing plate. The 2 nd protective film is laminated on the 1 st protective film via the adhesive layer provided in the 2 nd protective film. Thus, a laminate was produced in which the 2 nd protective film, the 1 st protective film, the circularly polarizing plate, the 3 rd adhesive layer, and the 3 rd resin film were sequentially laminated. The 1 st protective film can be peeled off from the circular polarizer, and the 2 nd protective film can be peeled off from the 1 st protective film.
The laminate was irradiated with a laser under the conditions shown in table 2, and the laminate was cut into a predetermined shape (20 mm in length × 100mm in width), thereby obtaining a laminate sheet. The 2 nd protective film was peeled off, and the height of burrs was measured at the outer peripheral portion of the 1 st protective film. The results are shown in Table 2.
Comparative examples 1 and 3 to 4
The front plate and the circularly polarizing plate were laminated to each other via an acrylic pressure-sensitive adhesive layer. The thickness of the acrylic adhesive layer was 25 μm. The front panel is laminated on the TAC film side of the circularly polarizing plate. An acrylic pressure-sensitive adhesive layer and a 3 rd resin film are laminated on the retardation film provided in the circularly polarizing plate. The 1 st protective film is laminated on the front panel via the adhesive layer provided in the 1 st protective film. Thus, a laminate was prepared in which the 1 st protective film, the front panel, the circularly polarizing plate, the 3 rd adhesive layer, and the 3 rd resin film were sequentially laminated. The 1 st protective film can be peeled off from the front panel.
The laminate was irradiated with a laser under the conditions shown in table 1, and the laminate was cut into a predetermined shape (20 mm in length × 100mm in width), thereby obtaining a laminate sheet. The height of the burr was measured at the outer peripheral portion of the 1 st protective film. The results are shown in Table 1.
Comparative examples 5 to 6
An acrylic pressure-sensitive adhesive layer and a 3 rd resin film are laminated on the retardation film provided in the circularly polarizing plate. The 1 st protective film is laminated on the circularly polarizing plate via the adhesive layer provided on the 1 st protective film. The adhesive layer provided in the 1 st protective film is laminated on the TAC film side of the circularly polarizing plate. Thus, a laminate was produced in which the 1 st protective film, circularly polarizing plate, 3 rd adhesive layer, and 3 rd resin film were sequentially laminated. The 1 st protective film can be peeled off from the circular polarizer.
The laminate was irradiated with a laser under the conditions shown in table 2, and the laminate was cut into a predetermined shape (20 mm in length × 100mm in width), thereby obtaining a laminate sheet. The height of the burr was measured at the outer peripheral portion of the 1 st protective film. The results are shown in Table 2.
[ Table 1]
[ Table 2]
In the table, the number of laser irradiation times of 1 means that the laminate was cut by full dicing, and the number of laser irradiation times of 10 means that all layers in the lamination direction were completely cut by the 10 th irradiation. In the table, "from the viewing side" means that, for example, in fig. 3, the laser is irradiated in the direction from the 2 nd protective film 200 toward the polarizing layer 2, and "from the side opposite to the viewing side" means that, for example, in fig. 3, the laser is irradiated in the direction from the polarizing layer 2 toward the 2 nd protective film 200.
The height of the burr at the outer peripheral portion of the 1 st protective film of the laminate sheet of the present invention is 6.0 μm or less, and the adsorption force is less likely to decrease when the laminate sheet is bonded to a display panel.
Description of the symbols
1, 8230, a front panel, 2, 8230, a polarizing layer, 3, 8230, a lamination layer, 20, 8230, a linear polarizer, 22, 8230, a phase difference film, 40, 8230, a burr, 41, 8230, a height of the burr, 50, 8230, a 3, adhesive layer, 51, 8230, a 3, resin film, 100, 8230, a 1, protective film, 101, 8230, a 1, resin film, 102, 8230, a 1, adhesive layer, 200, 8230, a 2, protective film, 201, 8230, a 2, resin film, 202, 8230, a 2, adhesive layer, 300, 8230, a lamination sheet, 301, 8230, a lamination sheet, 302, 8230, a lamination sheet, 303, 8230, a lamination sheet, 400, 8230and a lamination body.
Claims (10)
1. A laminate comprising a first protective film (1 st) and a polarizing layer laminated in this order,
the 1 st protective film has a 1 st adhesive layer on one side of a 1 st resin film,
the 1 st protective film is laminated on the polarizing layer via the 1 st adhesive layer,
the 1 st protective film can be peeled off from the polarizing layer,
the height of the burr of the outer peripheral part of the 1 st protective film is less than 6.0 μm.
2. A laminate comprising a 1 st protective film, a front plate and a polarizing layer laminated in this order,
the 1 st protective film has a 1 st adhesive layer on one side of a 1 st resin film,
the 1 st protective film is laminated on the front panel through the 1 st adhesive layer,
the 1 st protective film can be peeled off from the front panel,
the height of the burr of the outer peripheral part of the 1 st protective film is less than 6.0 μm.
3. The laminate sheet according to claim 1 or 2, wherein the height of the burr is 0.1 μm or more.
4. The laminate sheet according to any one of claims 1 to 3, wherein the polarizing layer has a layer obtained by curing a polymerizable liquid crystal compound.
5. A method of manufacturing a laminate sheet comprising:
a preparation step of preparing a laminate,
the laminated body is sequentially laminated with a 2 nd protective film, a 1 st protective film and a polarizing layer,
the 1 st protective film has a 1 st adhesive layer on one side of a 1 st resin film,
the 1 st protective film is laminated on the polarizing layer via the 1 st adhesive layer,
the 2 nd protective film has a 2 nd adhesive layer on one side of a 2 nd resin film,
the 2 nd protective film is laminated on the 1 st protective film through the 2 nd adhesive layer,
the 1 st protective film can be peeled off from the polarizing layer,
the 2 nd protective film can be peeled from the 1 st protective film; and
and a cutting step of irradiating the laminate with a laser beam from the polarizing layer side to cut the laminate into a predetermined shape, thereby obtaining a laminate sheet.
6. A method of manufacturing a laminate sheet comprising:
a preparation step of preparing a laminate body,
the laminated body is sequentially laminated with a 2 nd protective film, a 1 st protective film, a front panel and a polarizing layer,
the 1 st protective film has a 1 st adhesive layer on one side of a 1 st resin film,
the 1 st protective film is laminated on the front panel through the 1 st adhesive layer,
the 2 nd protective film has a 2 nd adhesive layer on one side of a 2 nd resin film,
the 2 nd protective film is laminated on the 1 st protective film through the 2 nd adhesive layer,
the 1 st protective film can be peeled off from the front panel,
the 2 nd protective film can be peeled off from the 1 st protective film; and
and a cutting step of irradiating the laminate with a laser beam from the polarizing layer side to cut the laminate into a predetermined shape, thereby obtaining a laminate sheet.
7. The method of producing a laminate sheet according to claim 5 or 6, wherein the output of the laser beam in the cutting step is 50 to 200W.
8. The method of producing a laminate sheet according to any one of claims 5 to 7, wherein in the cutting step, the laminate body is cut into a predetermined shape by full-cut cutting.
9. The method for producing a laminate sheet according to any one of claims 5 to 8, wherein the thickness of the 2 nd resin film is 40 μm or more.
10. The method for producing a laminate sheet according to any one of claims 5 to 9, wherein the polarizing layer has a layer obtained by curing a polymerizable liquid crystal compound.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020040574 | 2020-03-10 | ||
| JP2020-040574 | 2020-03-10 | ||
| JP2020192295A JP2021144208A (en) | 2020-03-10 | 2020-11-19 | Laminated sheet and manufacturing method therefor |
| JP2020-192295 | 2020-11-19 | ||
| PCT/JP2021/005161 WO2021182005A1 (en) | 2020-03-10 | 2021-02-12 | Laminate sheet and method for manufacturing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115244439A true CN115244439A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180019939.0A Pending CN115244439A (en) | 2020-03-10 | 2021-02-12 | Laminated sheet and method for producing same |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR20220148805A (en) |
| CN (1) | CN115244439A (en) |
| TW (1) | TW202140261A (en) |
| WO (1) | WO2021182005A1 (en) |
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|---|---|---|---|---|
| JP7234309B2 (en) * | 2021-07-29 | 2023-03-07 | 日東電工株式会社 | optical laminate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005189530A (en) * | 2003-12-25 | 2005-07-14 | Nitto Denko Corp | Lamination type polarizing plate and its manufacturing method |
| JP6470829B1 (en) * | 2017-12-04 | 2019-02-13 | 住友化学株式会社 | Optical laminate and method for producing the same |
| JP2019148734A (en) * | 2018-02-28 | 2019-09-05 | 住友化学株式会社 | Circularly polarizing plate |
| JP2019191556A (en) * | 2018-04-24 | 2019-10-31 | 住友化学株式会社 | Laminate body |
| JP2020034623A (en) * | 2018-08-27 | 2020-03-05 | 日東電工株式会社 | Laminate |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010083092A (en) * | 2008-10-02 | 2010-04-15 | Toray Ind Inc | Resin film roll and process for producing the same |
| WO2016158300A1 (en) | 2015-03-31 | 2016-10-06 | 富士フイルム株式会社 | Circular polarizing plate and bendable display device |
| WO2017014225A1 (en) * | 2015-07-21 | 2017-01-26 | 富士フイルム株式会社 | Liquid-crystal panel and liquid-crystal display device |
-
2021
- 2021-02-12 CN CN202180019939.0A patent/CN115244439A/en active Pending
- 2021-02-12 WO PCT/JP2021/005161 patent/WO2021182005A1/en active Application Filing
- 2021-02-12 KR KR1020227026244A patent/KR20220148805A/en unknown
- 2021-03-02 TW TW110107210A patent/TW202140261A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005189530A (en) * | 2003-12-25 | 2005-07-14 | Nitto Denko Corp | Lamination type polarizing plate and its manufacturing method |
| JP6470829B1 (en) * | 2017-12-04 | 2019-02-13 | 住友化学株式会社 | Optical laminate and method for producing the same |
| JP2019148734A (en) * | 2018-02-28 | 2019-09-05 | 住友化学株式会社 | Circularly polarizing plate |
| JP2019191556A (en) * | 2018-04-24 | 2019-10-31 | 住友化学株式会社 | Laminate body |
| JP2020034623A (en) * | 2018-08-27 | 2020-03-05 | 日東電工株式会社 | Laminate |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20220148805A (en) | 2022-11-07 |
| TW202140261A (en) | 2021-11-01 |
| WO2021182005A1 (en) | 2021-09-16 |
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