WO2019198617A1 - Procédé de fabrication d'un stratifié optique usiné à couche de revêtement dur - Google Patents

Procédé de fabrication d'un stratifié optique usiné à couche de revêtement dur Download PDF

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Publication number
WO2019198617A1
WO2019198617A1 PCT/JP2019/015003 JP2019015003W WO2019198617A1 WO 2019198617 A1 WO2019198617 A1 WO 2019198617A1 JP 2019015003 W JP2019015003 W JP 2019015003W WO 2019198617 A1 WO2019198617 A1 WO 2019198617A1
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Prior art keywords
hard coat
coat layer
optical
workpiece
cutting
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PCT/JP2019/015003
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English (en)
Japanese (ja)
Inventor
弘明 麓
史枝 片山
勝則 高田
翔 寳田
直孝 樋口
裕加 山本
Original Assignee
日東電工株式会社
Priority date (The priority date 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 date listed.)
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN201980025512.4A priority Critical patent/CN111971599B/zh
Priority to KR1020207029201A priority patent/KR20200142509A/ko
Publication of WO2019198617A1 publication Critical patent/WO2019198617A1/fr

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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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/12—Trimming or finishing edges, e.g. deburring welded corners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/13—Surface milling of plates, sheets or strips
    • 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
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance 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
    • 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
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B32B2038/0016—Abrading

Definitions

  • the present invention relates to a method for producing a cut optical layered body with a coated layer.
  • optical laminates for example, polarizing plates
  • image display devices such as mobile phones and notebook personal computers in order to realize image display and / or enhance the performance of the image display.
  • the optical laminate includes a hard coat layer, and when processing an optical laminate including such a hard coat layer, there is a problem that cracks are likely to occur in the hard coat layer. In particular, when processing other than a rectangle (deformation processing, non-linear processing), cracks generated in the hard coat layer become prominent.
  • the present invention has been made in order to solve the above-described conventional problems, and its main purpose is to suppress the crack of the hard coat layer and to produce an optical laminate with a hard coat layer that has been machined without causing defects. It is to provide a method that can be easily produced.
  • the method for producing a cut optical laminate with a hard coat layer includes forming a workpiece by stacking a plurality of optical laminates with a hard coat layer; and a rotating shaft extending in the stacking direction of the workpiece; Cutting the outer peripheral surface of the workpiece by bringing the cutting blade of a cutting means having a cutting blade configured as the outermost diameter of the main body rotating about the rotation axis into contact with the outer peripheral surface of the workpiece; Including.
  • the optical laminate with a hard coat layer includes an optical film, a hard coat layer, a pressure-sensitive adhesive layer, and a separator in this order, and the storage elastic modulus G ′ at 25 ° C. of the pressure-sensitive adhesive layer is 1.0 ⁇ .
  • the manufacturing method includes cutting the outer peripheral surface of the workpiece non-linearly.
  • the cutting means is an end mill.
  • the optical film is a polarizer or a polarizing plate.
  • the optical layered body with a hard coat layer further includes an optical functional film between the polarizer or the polarizing plate and the hard coat layer.
  • the optical functional film includes at least one selected from a cellulose resin, a cycloolefin resin, and an acrylic resin.
  • the breaking strength of the optical function film is 35 N or less.
  • the cutting means includes a rotating shaft extending in the stacking direction of the workpieces and the cutting blade configured as an outermost diameter twisted along the rotating shaft.
  • the non-linear cutting includes forming a concave portion including a curved portion when the optical layered body with a hard coat layer is viewed in plan.
  • the radius of the above-mentioned curve part is 5 mm or less.
  • a work is formed by stacking a plurality of optical laminates with a hard coat layer, and is configured as a rotation axis extending in the lamination direction of the work and an outermost diameter of a main body that rotates around the rotation axis.
  • a method for manufacturing an optical laminate with a hard coat layer comprising: bringing a cutting blade of a cutting means having a cutting blade into contact with the outer peripheral surface of the workpiece and cutting the outer peripheral surface of the workpiece; and adjacent to the hard coat layer
  • the processing methods include laser processing, punching processing, and cutting blade.
  • a candidate is a processing method (for example, end mill processing) in which the surface is brought into contact with the cutting surface from the lateral direction.
  • laser processing may adversely affect the optical properties of the resulting optical laminate, and punching has insufficient shape accuracy. Then, when end mill processing was attempted, a problem that cracks occurred in the hard coat layer was newly discovered.
  • the inventors set the storage elastic modulus of the pressure-sensitive adhesive layer adjacent to the hard coat layer in the optical laminate with a hard coat layer to a predetermined range, and the thickness to a predetermined value.
  • the said adhesive layer absorbed the damage to the hard-coat layer by a cutting means, and can suppress a crack. That is, this invention solves the problem which arose newly in the technique of cutting an optical laminated body with a hard-coat layer.
  • the method for producing an optical laminate with a hard coat layer includes forming a workpiece by stacking a plurality of optical laminates with a hard coat layer; and a rotation axis extending in the lamination direction of the workpiece and the rotation axis as a center. Cutting the outer peripheral surface of the workpiece by bringing the cutting blade of the cutting means having a cutting blade configured as the outermost diameter of the rotating main body into contact with the outer peripheral surface of the workpiece.
  • the effect of the present invention is remarkable in non-linear processing (deformation processing) of an optical laminate with a hard coat layer.
  • FIG. 1 is a schematic cross-sectional view for explaining an example of an optical laminate with a hard coat layer that can be used in the production method of the present invention.
  • the optical laminated body 100 with a hard-coat layer of the example of illustration contains the optical film 110, the hard-coat layer 120, the adhesive layer 130, and the separator 140 in this order.
  • the separator 140 is disposed on the viewing side.
  • the separator 140 is peeled and removed, and a cover glass or the like is bonded to the pressure-sensitive adhesive layer 130.
  • the optical laminate with a hard coat layer 100 may further include another pressure-sensitive adhesive layer 150 and another separator 160 on the opposite side of the optical film 110 from the hard coat layer 120.
  • Another pressure-sensitive adhesive layer 150 can be used for bonding the optical laminate with a hard coat layer to an image display device (substantially a display cell).
  • FIG. 2 is a schematic cross-sectional view illustrating another example of an optical laminate with a hard coat layer that can be used in the production method of the present invention.
  • the optical layered body 101 with a hard coat layer in the illustrated example further includes an optical functional film 170 between the optical film 110 and the hard coat layer 120.
  • any appropriate surface treatment layer is provided between the optical film 110 or the optical functional film 170 and the hard coat layer 120 and / or between the hard coat layer 120 and the pressure-sensitive adhesive layer 130 depending on the purpose. May be.
  • the surface treatment layer include an antireflection layer, an antiglare layer, and an antiglare layer.
  • optical film 110 the hard coat layer 120, the pressure-sensitive adhesive layer 130, and the optical functional film 170 will be briefly described.
  • optical film 110 examples include any appropriate optical film that can be laminated with a hard coat layer and can be used for applications that require cutting (particularly non-linear processing).
  • the optical film may be a film composed of a single layer or a laminate.
  • Specific examples of the optical film composed of a single layer include a polarizer and a retardation film.
  • Specific examples of the optical film configured as a laminate include a polarizing plate (typically, a laminate of a polarizer and a protective film), a conductive film for a touch panel, a surface treatment film, and a single layer thereof.
  • Examples include a laminated body (for example, a circularly polarizing plate for antireflection, a polarizing plate with a conductive layer for touch panel) obtained by appropriately laminating an optical film constituted and / or an optical film constituted as a laminated body according to the purpose.
  • a laminated body for example, a circularly polarizing plate for antireflection, a polarizing plate with a conductive layer for touch panel
  • the hard coat layer 120 preferably has sufficient surface hardness, excellent mechanical strength, and excellent light transmittance.
  • the hard coat layer may be formed from any appropriate resin as long as it has such desired properties.
  • the resin include a thermosetting resin, a thermoplastic resin, an ultraviolet curable resin, an electron beam curable resin, and a two-component mixed resin.
  • An ultraviolet curable resin is preferred. This is because the hard coat layer can be formed with a simple operation and high efficiency.
  • Specific examples of the ultraviolet curable resin include polyester, acrylic, urethane, amide, silicone, and epoxy ultraviolet curable resins.
  • the ultraviolet curable resin includes an ultraviolet curable monomer, oligomer, and polymer.
  • a preferable ultraviolet curable resin includes a resin composition containing an acrylic monomer component or oligomer component having preferably two or more, more preferably 3 to 6, ultraviolet polymerizable functional groups.
  • a photopolymerization initiator is blended in the ultraviolet curable resin.
  • the hard coat layer can be formed by any appropriate method.
  • the hard coat layer can be formed by applying a resin composition for forming a hard coat layer on a substrate, drying it, and irradiating the dried coating film with ultraviolet rays to cure it.
  • the hard coat layer formed on the substrate can be transferred to an optical film or an optical functional film.
  • the hard coat layer may be directly applied to the optical film or the optical functional film.
  • the thickness of the hard coat layer is, for example, 0.5 ⁇ m to 20 ⁇ m, preferably 1 ⁇ m to 15 ⁇ m.
  • the hard coat layer preferably has a pencil hardness of H or higher, more preferably 2H or higher, and even more preferably 3H or higher.
  • the pencil hardness can be measured according to, for example, JIS K 5600.
  • the storage elastic modulus G ′ at 25 ° C. of the pressure-sensitive adhesive layer 130 is 1.0 ⁇ 10 5 (Pa) to 2.5 ⁇ 10 5 (Pa), and the pressure-sensitive adhesive layer The thickness is 50 ⁇ m or more.
  • the storage elastic modulus of the pressure-sensitive adhesive layer 130 is preferably 1.1 ⁇ 10 5 (Pa) to 2.3 ⁇ 10 5 (Pa), more preferably 1.2 ⁇ 10 5 (Pa) to 2.0. ⁇ 10 5 (Pa).
  • the storage elastic modulus can be obtained from, for example, dynamic viscoelasticity measurement.
  • the thickness of the pressure-sensitive adhesive layer 130 is preferably 70 ⁇ m to 250 ⁇ m, more preferably 80 ⁇ m to 200 ⁇ m, and still more preferably 100 ⁇ m to 150 ⁇ m.
  • any appropriate pressure-sensitive adhesive can be adopted as long as it has pressure-sensitive adhesiveness and transparency that can be used for optical applications and has the desired storage elastic modulus. it can. Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives. By adjusting the type, number, combination and blending ratio of the monomers forming the base resin of the pressure-sensitive adhesive, the amount of the crosslinking agent, the reaction temperature, the reaction time, etc., the pressure-sensitive adhesive having the desired storage elastic modulus is obtained. Can be prepared.
  • the base resin of the pressure-sensitive adhesive may be used alone or in combination of two or more.
  • an acrylic pressure-sensitive adhesive is preferred. Details of the pressure-sensitive adhesive are described in, for example, Japanese Patent Application Laid-Open No. 2014-115468, and the description of the publication is incorporated herein by reference.
  • an adhesive which comprises another adhesive layer 150 a well-known and usual adhesive can be used in the industry.
  • the optical functional film 170 is a component provided as necessary.
  • the optical functional film is provided for imparting a desired optical function according to the purpose to the optical laminate with a hard coat layer.
  • Examples of the optical functional film include a polarizer or polarizing plate protective film, an antireflection film, an antiglare film, and a film for improving visibility when viewed through a polarized sunglasses.
  • a film for improving the visibility when viewed through polarized sunglasses for example, a film having an (elliptical) circular polarization function (for example, ⁇ / 4 plate), an ultrahigh retardation film (for example, 2000 nm or more) Film having in-plane retardation).
  • the optical functional film 170 may be formed of a resin film.
  • the resin constituting the resin film include a cellulose resin, a cycloolefin resin, and an acrylic resin. These may be used alone or in combination.
  • the breaking strength of the optical functional film 170 is preferably 35 N or less, more preferably 5 N to 30 N, and even more preferably 7 N to 28 N. According to the embodiment of the present invention, cracks can be satisfactorily suppressed even when an optical functional film having such a low breaking strength is used.
  • the breaking strength can be typically measured according to JIS K 7161.
  • FIG. 4 is a schematic perspective view for explaining the cutting process, and the work 1 is shown in this drawing.
  • a work 1 is formed by stacking a plurality of optical laminates with hard coat layers.
  • the optical layered body with a hard coat layer is typically cut into any appropriate shape when forming a workpiece.
  • the optical laminate with a hard coat layer may be cut into a rectangular shape, may be cut into a shape similar to the rectangular shape, and has an appropriate shape (for example, a circle) according to the purpose. It may be cut.
  • the workpiece 1 has outer peripheral surfaces (cutting surfaces) 1a and 1b facing each other and outer peripheral surfaces (cutting surfaces) 1c and 1d orthogonal to them.
  • the workpiece 1 is preferably clamped from above and below by clamping means (not shown).
  • the total thickness of the workpiece is preferably 8 mm to 20 mm, more preferably 9 mm to 15 mm, and even more preferably about 10 mm. If it is such thickness, the damage by the impact at the time of the press by a clamp means or a cutting process can be prevented.
  • the optical laminate with a hard coat layer is overlaid so that the workpiece has such a total thickness.
  • the number of the optical laminate with a hard coat layer constituting the work may be, for example, 10 to 50.
  • the clamp means (for example, a jig) may be made of a soft material or a hard material.
  • its hardness is preferably 60 ° to 80 °. If the hardness is too high, there may be a case where a mark is left by the clamping means. If the hardness is too low, displacement may occur due to deformation of the jig and cutting accuracy may be insufficient.
  • the outer peripheral surface of the workpiece 1 is cut by the cutting means 20.
  • Cutting is performed by bringing the cutting blade of the cutting means into contact with the outer peripheral surface of the workpiece 1 as described above. Cutting may be performed over the entire circumference of the outer peripheral surface of the workpiece, or may be performed only at a predetermined position. In the following illustrated example, cutting is performed over the entire circumference of the outer peripheral surface of the workpiece.
  • the outer periphery of the workpiece is cut linearly, and chamfered portions 4a and 4b are formed at two corners of the outer periphery of the workpiece.
  • a concave portion (a concave portion including a curved portion) 4c is formed in the central portion of the outer peripheral surface where the chamfered portions 4a and 4b are formed.
  • the cutting is typically so-called end milling as shown in FIGS. That is, the outer peripheral surface of the workpiece 1 is cut using the side surface of the cutting means (end mill) 20.
  • the cutting means (end mill) 20 a straight end mill can be typically used.
  • the cutting means 20 is configured as a rotating shaft 21 extending in the stacking direction (vertical direction) of the workpiece 1 and an outermost diameter of a main body that rotates around the rotating shaft 21.
  • a cutting blade 22 In the illustrated example, the cutting blade 22 is configured as an outermost diameter twisted along the rotation shaft 21.
  • the cutting blade 22 includes a cutting edge 22a, a rake surface 22b, and a relief surface 22c.
  • the number of blades of the cutting blade 22 can be appropriately set according to the purpose. Although the cutting blade in the illustrated example has a configuration of three sheets, the number of blades may be one continuous, two, four, or five or more. Good. Preferably, the number of blades is 3 or more.
  • the number of blades is three or more, the adhesion of the shaving residue of the adhesive to the escape surface 22c is suppressed, and as a result, blocking can be suppressed.
  • This is a tendency opposite to that of cutting of an optical laminate including a normal pressure-sensitive adhesive layer. That is, in the cutting of an optical laminated body including a normal pressure-sensitive adhesive layer, if the number of blades is large, the scraps accumulate on the rake face 22b and often cause cutting defects.
  • the optical laminate with a hard coat layer includes a soft adhesive layer as in the present invention, the elastic recovery of the optical laminate with a hard coat layer (its adhesive layer) is suppressed when the number of blades is large.
  • Adhesion of the adhesive scraps to the escape surface 22c is suppressed.
  • contact between the scraped residue of the pressure-sensitive adhesive and the optical laminate with a hard coat layer (adhesive layer thereof) is suppressed, and as a result, blocking due to the scraped residue can be suppressed. More specifically, it is as follows: In general, the smaller the number of blades, the better the scraping performance of the adhesive scrap on the rake face, while the greater the cutting resistance per blade, Since the elastic recovery of the pressure-sensitive adhesive layer is increased, the shavings of the pressure-sensitive adhesive easily adhere to the escape surface.
  • blocking refers to a phenomenon in which the optical laminates with hard coat layers in the work are bonded to each other with the pressure-sensitive adhesive on the end surface. It will contribute to the adhesion between the bodies.
  • the blade angle of the cutting means (the twist angle ⁇ of the cutting blade in the illustrated example) is preferably 45 ° to 75 °, more preferably 45 ° to 60 °. With such a blade angle, the shaving residue of the adhesive can be easily discharged from the cutting blade, and as a result, blocking can be suppressed.
  • the relief surface of the cutting blade is preferably roughened. Any appropriate process can be adopted as the roughening process. A typical example is blasting. By applying a roughening treatment to the relief surface, adhesion of the adhesive to the cutting blade is suppressed, and as a result, blocking can be suppressed.
  • blocking can be further suppressed by the above synergistic effect. That is, if an end mill is the above structures, blocking can be suppressed favorably.
  • FIG. 6A the portion where the chamfered portion 4a in FIG. 3 is formed is chamfered, and then, as shown in FIG. 6B, the portion where the chamfered portion 4b is formed is chamfered. Processed. Finally, as shown in FIG. 6C, a concave portion (a concave portion including a curved portion) 4c is formed by cutting.
  • the radius of the curved portion is preferably 5 mm or less, more preferably 4 mm or less, and further preferably 3 mm or less.
  • the formation order (cutting order) of the chamfered parts 4a and 4b and the recessed part 4c is not limited.
  • the non-linear machining as described above may be performed continuously with the linear machining (for example, unlike the illustrated example, the entire circumference of the workpiece may be continuously machined), and a predetermined linear machining is performed. You may carry out after performing, and you may carry out before a linear process.
  • Cutting conditions can be set appropriately according to the desired shape.
  • the diameter of the cutting means (end mill) 20 is preferably 3 mm to 20 mm.
  • the rotation speed of the cutting means is preferably 1000 rpm to 60000 rpm, more preferably 10,000 rpm to 40000 rpm.
  • the feed rate of the second cutting means is preferably 500 mm / min to 10000 mm / min, more preferably 500 mm / min to 2500 mm / min.
  • the number of cuts at the cut location can be one round, two rounds, three rounds or more.
  • the chamfered portion 4a, the chamfered portion 4b, and the recessed portion 4c are formed in this order, but these may be formed in any appropriate order.
  • Breaking strength The breaking strength of the optical functional film used in the examples and comparative examples was measured according to JIS K 7161. Specifically, a film is cut into a length of 100 mm and a width of 10 mm to obtain a measurement sample, and the measurement sample is pulled until it breaks using a precision universal testing machine (manufactured by Shimadzu Corporation, product name “Autograph”). Was measured. The tensile condition of the measurement sample was 300 mm / min.
  • Pencil hardness The surface of the hard coat layer used in the examples and comparative examples was measured according to JIS K 5600.
  • A The optical laminate with a hard coat layer could be lifted one by one.
  • ⁇ A plurality of optical laminates with a hard coat layer could be lifted, but when shaken, they could be separated one by one. Multiple optical laminates with coat layers were lifted and could not be separated one by one even when shaken
  • a polarizer As a polarizer, a long polyvinyl alcohol (PVA) resin film containing iodine and uniaxially stretched in the longitudinal direction (MD direction) (thickness 12 ⁇ m) was used. A pressure-sensitive adhesive layer (thickness 5 ⁇ m) is formed on one side of the polarizer, and a long optical function film (HC-TAC film) is bonded to the polarizer so that the longitudinal directions thereof are aligned with each other. It was.
  • PVA polyvinyl alcohol
  • MD direction longitudinal direction
  • HC-TAC film long optical function film
  • the HC-TAC film is a film in which a hard coat (HC) layer (2 ⁇ m) is formed on a triacetyl cellulose (TAC) film (25 ⁇ m), and is bonded so that the TAC film is on the polarizer side. .
  • a pressure-sensitive adhesive layer is formed on the hard coat layer side of the obtained polarizer / TAC film / HC layer laminate, and another pressure-sensitive adhesive layer is formed on the polarizer side, and a separator is formed on each pressure-sensitive adhesive layer. Bonding was performed to obtain a long optical laminate with a hard coat layer (polarizing plate with a hard coat layer).
  • the storage elastic modulus of the pressure-sensitive adhesive layer adjacent to the HC layer was 1.2 ⁇ 10 5 (Pa), and the thickness was 100 ⁇ m.
  • the breaking strength of the HC-TAC film was 26N.
  • the pencil hardness of the HC layer was 3H.
  • the polarizing plate with a hard coat layer obtained as described above was punched into a size of 5.7 inches (length: about 140 mm and width: about 65 mm), and a plurality of punched polarizing plates were stacked to form a workpiece (total thickness: about 10 mm).
  • a workpiece sandwiched between clamps (jigs)
  • chamfered portions are formed at the two corners of the outer periphery of the workpiece by end milling, and a concave portion (curved line) is formed at the center of the outer peripheral surface where the chamfered portion is formed.
  • the concave part including the part) was formed, and a polarizing plate with a hard coat layer cut as shown in FIG. 3 was obtained.
  • the radius of the curved part was 2.5 mm.
  • the number of blades of the end mill was 3, and the blade angle (twist angle) was 45 °.
  • the feed rate of the end mill was 1500 mm / min, and the rotation speed was 30000 rpm.
  • Example 2 A polarizing plate with a hard coat layer was produced in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer adjacent to the HC layer was 150 ⁇ m. This polarizing plate with a hard coat layer was cut in the same manner as in Example 1. The finally obtained polarizing plate with a hard coat layer that was processed was subjected to the evaluation of the crack. The results are shown in Table 1.
  • Example 3 A polarizing plate with a hard coat layer was produced in the same manner as in Example 1 except that the thickness of the polarizer was 5 ⁇ m and that an HC-COP film was used instead of the HC-TAC film.
  • the HC-COP film was a film in which a hard coat (HC) layer (2 ⁇ m) was formed on a cycloolefin (COP) film (25 ⁇ m), and the breaking strength was 9N.
  • the pencil hardness of the HC layer was 2H.
  • This polarizing plate with a hard coat layer was cut in the same manner as in Example 1.
  • the finally obtained polarizing plate with a hard coat layer that was processed was subjected to the evaluation of the crack. The results are shown in Table 1. Furthermore, processing accuracy and blocking were also evaluated. The results are shown in Table 2.
  • Example 4 A polarizing plate with a hard coat layer was produced in the same manner as in Example 3 except that the storage elastic modulus of the pressure-sensitive adhesive layer adjacent to the HC layer was 2.0 ⁇ 10 5 (Pa). This polarizing plate with a hard coat layer was cut in the same manner as in Example 1. The finally obtained polarizing plate with a hard coat layer that was processed was subjected to the evaluation of the crack. The results are shown in Table 1.
  • Examples 5 to 8 and Comparative Examples 1 to 7> The thickness of the polarizer, the optical functional film (and hence its breaking strength), the pencil hardness of the hard coat layer, the thickness of the adhesive layer adjacent to the hard coat layer, the storage elastic modulus of the adhesive layer, and / or the recess A cut polarizing plate with a hard coat layer was produced in the same manner as in Example 1 except that the radius of the curved portion was changed as shown in Table 1. The obtained polarizing plate with a hard coat layer was subjected to evaluation of the crack. The results are shown in Table 1. For Comparative Example 3, processing accuracy and blocking were also evaluated. The results are shown in Table 2.
  • the storage elastic modulus of the pressure-sensitive adhesive layer adjacent to the hard coat layer is set within a predetermined range. And by making thickness into more than predetermined value, the crack (especially the crack of the curved part of a recessed part) of a hard-coat layer can be suppressed notably. As a result, the crack of the whole optical laminated body with a hard-coat layer can be suppressed.
  • the production method of the present invention can be suitably used for production of an optical laminate with a hard coat layer that requires cutting (particularly non-linear machining).
  • the optical layered body with a hard coat layer obtained by the production method of the present invention can be suitably used for a deformed image display unit typified by an automobile instrument panel or a smart watch.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Surface Treatment Of Optical Elements (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
  • Milling Processes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un procédé de fabrication simple d'un stratifié optique usiné avec une couche de revêtement dur sans provoquer de problème tout en réduisant au minimum les fissures dans la couche de revêtement dur. Le procédé de fabrication d'un stratifié optique usiné avec une couche de revêtement dur selon la présente invention, consiste : à former une pièce par stratification d'une pluralité de stratifiés optiques avec des couches de revêtement dur ; et à usiner la surface périphérique externe de la pièce avec la lame de coupe d'un moyen de coupe amené en contact avec la surface périphérique externe de la pièce, le moyen de coupe ayant un arbre rotatif s'étendant dans la direction du stratifié de la pièce et une lame de coupe configurée comme le diamètre le plus externe d'un corps tournant autour de l'arbre rotatif. Le stratifié optique doté d'une couche de revêtement dur comprend un film optique, une couche de revêtement dur, une couche adhésive et un séparateur, dans cet ordre. Un module d'élasticité de stockage G' à 25 °C dans la couche adhésive est de 1,0 × 105 (Pa) à 2,5 × 105 (Pa), et l'épaisseur de la couche adhésive est de 50 µm ou plus.
PCT/JP2019/015003 2018-04-13 2019-04-04 Procédé de fabrication d'un stratifié optique usiné à couche de revêtement dur WO2019198617A1 (fr)

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KR1020207029201A KR20200142509A (ko) 2018-04-13 2019-04-04 절삭 가공된 하드 코트층 부착 광학 적층체의 제조 방법

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JP7221256B2 (ja) 2020-09-14 2023-02-13 日東電工株式会社 偏光板、位相差層付偏光板、ならびに、該偏光板または該位相差層付偏光板を含む画像表示装置
CN114609711B (zh) * 2022-03-09 2023-07-18 业成科技（成都）有限公司 光学元件的制造方法、夹持装置、显示模组及电子设备

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JP2016136238A (ja) * 2015-01-20 2016-07-28 日東電工株式会社 両面粘着剤層付偏光フィルム、その製造方法および画像表示装置
JP2016210995A (ja) * 2014-06-05 2016-12-15 Dic株式会社 積層体及び情報表示装置
JP2018012182A (ja) * 2016-07-22 2018-01-25 日東電工株式会社 偏光板の製造方法およびその製造装置
JP2018022140A (ja) * 2016-07-22 2018-02-08 日東電工株式会社 偏光板の製造方法およびその製造装置
WO2018034148A1 (fr) * 2016-08-15 2018-02-22 日東電工株式会社 Laminé pour des dispositifs d'affichage d'image flexibles, et dispositif d'affichage d'image flexible

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JP2004114205A (ja) 2002-09-25 2004-04-15 Star Seiki Co Ltd 集塵装置
JP6804310B2 (ja) * 2016-03-07 2020-12-23 日東電工株式会社 光学用粘着シート、粘着剤層付偏光フィルム、および液晶表示装置

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JP2016210995A (ja) * 2014-06-05 2016-12-15 Dic株式会社 積層体及び情報表示装置
JP2016136238A (ja) * 2015-01-20 2016-07-28 日東電工株式会社 両面粘着剤層付偏光フィルム、その製造方法および画像表示装置
JP2018012182A (ja) * 2016-07-22 2018-01-25 日東電工株式会社 偏光板の製造方法およびその製造装置
JP2018022140A (ja) * 2016-07-22 2018-02-08 日東電工株式会社 偏光板の製造方法およびその製造装置
WO2018034148A1 (fr) * 2016-08-15 2018-02-22 日東電工株式会社 Laminé pour des dispositifs d'affichage d'image flexibles, et dispositif d'affichage d'image flexible

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JP7018348B2 (ja) 2022-02-10
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CN111971599A (zh) 2020-11-20
CN111971599B (zh) 2022-08-12
KR20200142509A (ko) 2020-12-22
JP2019184911A (ja) 2019-10-24

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