Nothing Special   »   [go: up one dir, main page]

WO2020162102A1 - Corps stratifié optique et dispositif d'affichage - Google Patents

Corps stratifié optique et dispositif d'affichage Download PDF

Info

Publication number
WO2020162102A1
WO2020162102A1 PCT/JP2020/000635 JP2020000635W WO2020162102A1 WO 2020162102 A1 WO2020162102 A1 WO 2020162102A1 JP 2020000635 W JP2020000635 W JP 2020000635W WO 2020162102 A1 WO2020162102 A1 WO 2020162102A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
film
front plate
touch sensor
thickness
Prior art date
Application number
PCT/JP2020/000635
Other languages
English (en)
Japanese (ja)
Inventor
大山 姜
東輝 金
▲ビョン▼▲フン▼ 宋
Original Assignee
住友化学株式会社
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.)
Filing date
Publication date
Priority claimed from JP2019135378A external-priority patent/JP6739601B1/ja
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN202080012352.2A priority Critical patent/CN113396345B/zh
Priority to KR1020217025505A priority patent/KR20210121084A/ko
Publication of WO2020162102A1 publication Critical patent/WO2020162102A1/fr

Links

Images

Classifications

    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • 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
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • the present invention relates to an optical laminate and a display device.
  • Patent Document 1 describes a touch panel laminated body used for an optical display device.
  • the present invention provides an optical laminate including a front plate and a touch sensor panel in order, which is excellent in impact resistance and bending resistance, and a display device including the optical laminate. To aim.
  • the present invention provides the following optical layered body and display device.
  • An optical laminate including a front plate and a touch sensor panel,
  • the touch sensor panel includes a transparent conductive layer and a base material layer supporting the transparent conductive layer,
  • the toughness of the base material layer is b [mJ/mm 3 ]
  • the thickness of the base material layer is c [ ⁇ m]
  • the evaluation parameter A is an optical layered body that satisfies the relationship of the following formula (2a).
  • A a ⁇ b/c (1)
  • a display device including the optical laminate according to any one of [1] to [7].
  • an optical laminate having excellent impact resistance and bending resistance
  • a display device including the optical laminate
  • FIG. 1 is a schematic cross-sectional view of an optical layered body according to an embodiment of the present invention.
  • the optical laminate 100 shown in FIG. 1 includes a front plate 10 and a touch sensor panel 30, and a bonding layer 20 between the front plate 10 and the touch sensor panel 30.
  • the touch sensor panel 30 includes a transparent conductive layer 31 and a base material layer 32 that supports the transparent conductive layer 31.
  • the front plate 10 and the transparent conductive layer 31 may each be a single layer or multiple layers.
  • the base material layer 32 is a single layer.
  • the tensile elastic modulus of the front plate 10 at a temperature of 23° C. is a [GPa]
  • the toughness of the base material layer 32 at a temperature of 23° C. is b [mJ/mm 3 ]
  • the thickness of the base material layer 32 is c [ ⁇ m].
  • the evaluation parameter A satisfies the relationship of the above formula (2a)
  • impact resistance and flex resistance can be improved.
  • the front plate 10 and the base material layer 32 are selected so as to satisfy the relationship of the above formula (2a).
  • the evaluation parameter A preferably satisfies the relationship of the following expression (2b), and more preferably the relationship of the following expression (2c).
  • the evaluation parameter A preferably satisfies the relationship of the following expression (2d), and may be 50 or less.
  • the optical laminated body 100 can be bent at least in the direction in which the front plate 10 is placed inside.
  • the term “bendable” means that the front plate 10 can be bent in a direction inward without causing cracks.
  • the inventors of the present invention have found that when an optical laminated body including a front plate and a touch sensor panel is arranged on the viewing side of a flexible display device, the optical laminated body does not have sufficient bending resistance. I got the knowledge that there is. On the other hand, it became clear that impact resistance tends to be insufficient when a flexible material is used to solve this problem. Then, the present invention has been completed by earnestly studying and finding that the bending resistance and the impact resistance can be improved by adjusting the evaluation parameter A for the optical laminate.
  • the evaluation parameter B calculated by the following formula (3) preferably satisfies the relationship of the following formula (4a).
  • B b ⁇ c (3)
  • the evaluation parameter B preferably satisfies the relationship of the following expression (4b), more preferably the relationship of the following expression (4c), and may be 1000 or more, from the viewpoint of suppressing the extension of cracks due to bending. ..
  • the evaluation parameter B preferably satisfies the relationship of the following expression (4d), and more preferably satisfies the relationship of the following expression (4e).
  • the tensile elastic modulus a [GPa] and the toughness b [mJ/mm 3 ] are values measured at a normal temperature (temperature 23° C.) by the method described in Examples below.
  • the shape of the optical layered body 100 in the surface direction may be, for example, a rectangular shape, preferably a rectangular shape having long sides and short sides, and more preferably a rectangle.
  • the length of the long side may be, for example, 10 mm or more and 1400 mm or less, and preferably 50 mm or more and 600 mm or less.
  • the length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less.
  • Each layer constituting the optical layered body 100 may be rounded at the corners, notched at the ends, or perforated.
  • the thickness of the optical layered body 100 is not particularly limited because it varies depending on the function required for the optical layered body and the application of the layered body, but is, for example, 20 ⁇ m or more and 1,000 ⁇ m or less, preferably 50 ⁇ m or more and 500 ⁇ m or less.
  • the optical layered body 100 can be used, for example, in a display device or the like.
  • the display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescent display device.
  • the optical laminate 100 is suitable for a flexible display device.
  • a display device including the optical layered body of the present invention has excellent impact resistance and flex resistance.
  • the optical layered body 100 includes the bonding layer 20 between the front plate 10 and the touch sensor panel 30.
  • the optical layered body 100 is preferably configured to be a part of a display device when used in the display device.
  • the optical layered body 100 may include, without limitation, the elements that the display device may include, and may include, for example, a polarizing plate, a partially formed colored layer, a protective film, a retardation film, or the like. Good.
  • FIG. 2 shows an optical laminate 200 having a configuration in which a polarizing plate is provided between the front plate 10 and the touch sensor panel 30.
  • the optical laminate 200 shown in FIG. 2 includes the front plate 10, the bonding layer 20, the polarizing plate 40, the bonding layer 20, and the touch sensor panel 30 in this order.
  • the optical layered body 200 shown in FIG. 2 is different from the optical layered body 100 shown in FIG. 1 only in that a polarizing plate 40 is provided and in that two bonding layers 20 are provided.
  • the polarizing plate is not limited to the configuration provided between the front plate 10 and the touch sensor panel 30, and may be provided on the surface of the touch sensor panel 30 opposite to the front plate 10 side. It may have a laminated structure.
  • the front plate 10 is not limited in material and thickness as long as it is a plate that can transmit light, and may be composed of only one layer or may be composed of two or more layers. Examples thereof include a resin-made plate-shaped body (for example, a resin plate, a resin sheet, a resin film, etc.), a glass-made plate-shaped body (for example, a glass plate, a glass film, etc.), and the like.
  • the front plate can be a layer forming the outermost surface of the display device.
  • the thickness of the front plate 10 may be, for example, 30 ⁇ m or more and 500 ⁇ m or less, preferably 40 ⁇ m or more and 200 ⁇ m or less, and more preferably 50 ⁇ m or more and 100 ⁇ m or less.
  • the thickness of each layer can be measured according to the thickness measuring method described in Examples below.
  • the resin plate is not limited as long as it can transmit light.
  • the resin constituting the resin plate-like body such as a resin film include triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, and the like.
  • Polyamide Polyamide, polyetherimide, poly(meth)acrylic, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone
  • the film include polymers formed of polymers such as polyether sulfone, polymethylmethacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate and polyamide imide. These polymers can be used alone or in combination of two or more. From the viewpoint of improving strength and transparency, a resin film formed of a polymer such as polyimide, polyamide or polyamide-imide is preferable.
  • the front plate 10 has a tensile elastic modulus a at a temperature of 23° C. of preferably 5 GPa or more, and more preferably 6 GPa or more, from the viewpoint of easily forming the optical laminate 100 having excellent impact resistance. ..
  • the front plate 10 preferably has a tensile elastic modulus a at a temperature of 23° C. of 20 GPa or less, more preferably 15 GPa or less, from the viewpoint of easily forming the optical laminate 100 having excellent bending resistance. It is more preferably 10 GPa or less.
  • the front plate 10 is preferably a film in which a hard coat layer is provided on at least one surface of the base film from the viewpoint of obtaining a desired tensile elastic modulus a.
  • a film made of the above resin can be used as the substrate film.
  • the hard coat layer may be formed on one surface of the base film, or may be formed on both surfaces. By providing the hard coat layer, the resin film having improved hardness and scratch resistance can be obtained.
  • the hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, and epoxy resin.
  • the hard coat layer may contain an additive in order to improve the strength.
  • the additive is not limited and includes inorganic fine particles, organic fine particles, or a mixture thereof.
  • the front plate 10 is a glass plate
  • tempered glass for display is preferably used as the glass plate.
  • the glass plate may have a thickness of, for example, 10 ⁇ m or more, 20 ⁇ m or more, and 50 ⁇ m or more and 1,000 ⁇ m or less. By using the glass plate, the front plate 10 having excellent mechanical strength and surface hardness can be formed.
  • the front plate 10 When the optical laminate 100 is used in a display device, the front plate 10 has not only a function of protecting the front surface (screen) of the display device (function as a window film) but also a touch detected by the touch sensor panel 30. It may also have a function as an operation surface for performing, and may further have a blue light cut function, a viewing angle adjustment function, and the like.
  • the touch sensor panel 30 is a sensor that can detect the position touched by the front plate 10 and has a transparent conductive layer 31 and a base material layer 32 that supports the transparent conductive layer 31, the detection method is limited.
  • a touch sensor panel such as a resistance film type, an electrostatic capacitance type, an optical sensor type, an ultrasonic type, an electromagnetic inductive coupling type, a surface acoustic wave type is exemplified.
  • the capacitance type touch sensor panel is preferably used in terms of low cost, fast reaction speed, and thinning.
  • the touch sensor panel 30 may include a transparent conductive layer 31 and a base material layer 32 in order from the front plate 10 side.
  • the touch sensor panel 30 may include an adhesive layer, a separation layer, a protective layer, or the like between the transparent conductive layer 31 and the base material layer 32 supporting the transparent conductive layer 31.
  • the adhesive layer include an adhesive layer and a pressure-sensitive adhesive layer.
  • a base material layer 32 having the transparent conductive layer 31 formed by vapor deposition on one surface, a base material layer 32 to which the transparent conductive layer 31 is transferred via an adhesive layer, and the like. are listed.
  • An example of a capacitance type touch sensor panel is composed of a base material layer, a transparent conductive layer for position detection provided on the surface of the base material layer, and a touch position detection circuit.
  • a display device provided with an optical laminated body having a capacitance type touch sensor panel
  • the transparent conductive layer is grounded through the capacitance of the human body at the touched point.
  • the touch position detection circuit detects the grounding of the transparent conductive layer, and the touched position is detected.
  • the transparent conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or a metal layer made of a metal such as aluminum, copper, silver, gold or an alloy thereof.
  • the separation layer may be a layer formed on a substrate such as glass and for separating the transparent conductive layer formed on the separation layer together with the separation layer from the substrate.
  • the separation layer is preferably an inorganic layer or an organic layer. Examples of the material forming the inorganic layer include silicon oxide.
  • a (meth)acrylic resin composition, an epoxy resin composition, a polyimide resin composition, or the like can be used as a material for forming the organic material layer.
  • the protective layer can be provided in contact with the transparent conductive layer to protect the conductive layer.
  • the protective layer includes at least one of an organic insulating film and an inorganic insulating film, and these films can be formed by a spin coating method, a sputtering method, a vapor deposition method, or the like.
  • the touch sensor panel 30 can be manufactured, for example, as follows.
  • the base material layer 32 is laminated on the glass substrate via the adhesive layer.
  • the transparent conductive layer 31 patterned by photolithography is formed on the base material layer 32.
  • the glass substrate and the base material layer 32 are separated, and the touch sensor panel 30 including the transparent conductive layer 31 and the base material layer 32 is obtained.
  • the separation layer is formed on the glass substrate, and if necessary, the protective layer is formed on the separation layer.
  • a transparent conductive layer 31 patterned by photolithography is formed on the separation layer (or protection layer).
  • a protective film peelable from the transparent conductive layer 31 is laminated on the transparent conductive layer 31, and the transparent conductive layer 31 to the separation layer are transferred to separate the glass substrate.
  • the sensor panel 30 is obtained.
  • triacetyl cellulose polyethylene terephthalate, cycloolefin polymer, polyethylene naphthalate, polyolefin, polycycloolefin, polycarbonate, polyether sulfone, polyarylate, polyimide, polyamide, polystyrene, polynorbornene, etc.
  • a resin film may be used.
  • Polyethylene terephthalate is preferably used from the viewpoint of easily forming a base material layer having a desired toughness.
  • toughness b is 5 mJ / mm 3 or more, still be at 10 mJ / mm 3 or more It is most preferably 50 mJ/mm 3 or more.
  • the toughness b of the base material layer of the touch sensor panel is, for example, 200 mJ/mm 3 or less.
  • the thickness c of the base material layer of the touch sensor panel is preferably 50 ⁇ m or less, and more preferably 30 ⁇ m or less, from the viewpoint of easily forming an optical laminate having excellent bending resistance.
  • the base material layer of the touch sensor panel has a thickness c of, for example, 5 ⁇ m or more.
  • Examples of the polarizing plate 40 include a stretched film having a dichroic dye adsorbed thereon, or a film containing a film obtained by coating and curing the dichroic dye as a polarizer.
  • Examples of the polarizing plate 40 include a film including a retardation layer in addition to the polarizer.
  • the dichroic organic dye includes C.I. I. Includes dichroic direct dyes composed of disazo compounds such as DIRECT RED 39, and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo.
  • a film used as a polarizer and coated with a dichroic dye and cured a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal is applied and cured. Examples thereof include a film having a layer obtained by the above.
  • a film coated with a dichroic dye and cured is preferable because it has no limitation in the bending direction as compared with a stretched film having a dichroic dye adsorbed.
  • a polarizing plate having a stretched film having a dichroic dye adsorbed thereon as a polarizer will be described.
  • a stretched film having a dichroic dye, which is a polarizer is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, and the dichroic dye is obtained by dyeing the polyvinyl alcohol-based resin film with a dichroic dye.
  • a polarizer may be used as it is as a polarizing plate, or one having a transparent protective film laminated on one side or both sides may be used as a polarizing plate.
  • the thickness of the polarizer thus obtained is preferably 2 ⁇ m or more and 40 ⁇ m or less.
  • Polyvinyl alcohol resin is obtained by saponifying polyvinyl acetate resin.
  • 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 is used.
  • the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
  • the saponification degree of the polyvinyl alcohol resin is usually 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can also be used.
  • the polymerization degree of the polyvinyl alcohol-based resin is usually about 1,000 or more and 10,000 or less, preferably 1,500 or more and 5,000 or less.
  • a film produced from such a polyvinyl alcohol resin is used as a raw film for polarizing plates.
  • the method for forming a film of the polyvinyl alcohol-based resin is not particularly limited, and the film can be formed by a known method.
  • the film thickness of the polyvinyl alcohol-based raw film can be, for example, about 10 ⁇ m or more and 150 ⁇ m or less.
  • Uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before dyeing with the dichroic dye, simultaneously with dyeing, or after dyeing.
  • the uniaxial stretching may be performed before the boric acid treatment or during the boric acid treatment. It is also possible to carry out uniaxial stretching in these plural stages.
  • stretching may be uniaxial between rolls having different peripheral speeds, or uniaxial stretching may be performed using a heat roll.
  • the uniaxial stretching may be dry stretching in which stretching is performed in the atmosphere, or wet stretching in which a polyvinyl alcohol-based resin film is swollen with a solvent.
  • the draw ratio is usually about 3 to 8 times.
  • the thickness of a polarizing plate provided with a stretched film as a polarizer may be, for example, 1 ⁇ m or more and 400 ⁇ m or less, or may be 5 ⁇ m or more and 100 ⁇ m or less.
  • the material of the protective film to be attached to one side or both sides of the polarizer is not particularly limited, but for example, a cyclic polyolefin-based resin film, triacetyl cellulose, a cellulose acetate-based resin made of a resin such as diacetyl cellulose.
  • Films known in the art such as resin films, polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polycarbonate resin films, (meth)acrylic resin films, polypropylene resin films, etc. Can be mentioned.
  • the thickness of the protective film is usually 300 ⁇ m or less, preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, and usually 5 ⁇ m or more, preferably 20 ⁇ m or more. ..
  • the protective film may or may not have a retardation.
  • Polarizing Plate having a film formed from liquid crystal layer as a polarizer will be described.
  • a film used as a polarizer and coated with a dichroic dye a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound is applied to a substrate and cured.
  • the film etc. which are obtained by this are mentioned.
  • the film may be used as a polarizing plate by peeling the base material or together with the base material, or may be used as a polarizing plate with a structure having a protective film on one side or both sides thereof.
  • the protective film may be the same as the polarizing plate including the above-mentioned stretched film as a polarizer.
  • the film obtained by applying and curing the dichroic dye is preferably thin, but if it is too thin, the strength tends to decrease and the processability tends to deteriorate.
  • the thickness of the film is usually 20 ⁇ m or less, preferably 5 ⁇ m or less, and more preferably 0.5 ⁇ m or more and 3 ⁇ m or less.
  • Specific examples of the film obtained by applying the dichroic dye include those described in JP-A-2013-148883.
  • the thickness of a polarizing plate provided with a film formed of a liquid crystal layer as a polarizer may be, for example, 1 ⁇ m or more and 50 ⁇ m or less.
  • the retardation layer can include one layer or two or more retardation layers.
  • the retardation layer may be a positive A plate such as a ⁇ /4 plate or a ⁇ /2 plate, and a positive C plate.
  • the retardation layer may be formed of the resin film exemplified as the material of the protective film described above, or may be formed of a layer in which a polymerizable liquid crystal compound is cured.
  • the retardation layer may further include an alignment film or a base film.
  • the thickness of the retardation layer may be, for example, 1 ⁇ m or more and 50 ⁇ m or less.
  • the reflection of external light can be prevented by configuring the optical laminate to include a circularly polarizing plate as a polarizing plate.
  • the bonding layer 20 is a layer interposed between the front plate 10 and the touch sensor panel 30, and may be, for example, an adhesive layer or an adhesive layer.
  • the bonding layer 20 is a layer for bonding the front plate 10 and the touch sensor panel 30, a layer for bonding the front plate 10 and the polarizing plate 40, and a layer for bonding the polarizing plate 40 and the touch panel 30.
  • the bonding layer 20 has a colored layer provided between the front plate 10 and the touch sensor panel 30, and when provided in contact with the colored layer, the step of the colored layer can be favorably absorbed. It is preferably an adhesive layer.
  • the optical layered body may include one bonding layer 20 or two or more bonding layers 20. When the optical laminate includes a plurality of bonding layers 20, the plurality of bonding layers may be the same or different from each other.
  • the pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition containing a resin such as a (meth)acrylic resin, a rubber resin, a urethane resin, an ester resin, a silicone resin, or a polyvinyl ether resin as a main component.
  • a pressure-sensitive adhesive composition containing a (meth)acrylic resin as a base polymer which is excellent in transparency, weather resistance, heat resistance, etc., is preferable.
  • the pressure-sensitive adhesive composition may be an active energy ray curable type or a thermosetting type.
  • Examples of the (meth)acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, and (meth)acrylic acid 2-
  • a polymer or copolymer having one or more kinds of (meth)acrylic acid ester such as ethylhexyl as a monomer is preferably used. It is preferable to copolymerize a polar monomer with the base polymer.
  • polar monomer for example, (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate, glycidyl ( Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like such as (meth)acrylate.
  • the pressure-sensitive adhesive composition may contain only the above base polymer, but usually further contains a crosslinking agent.
  • a cross-linking agent a metal ion having a valence of 2 or more and forming a carboxylic acid metal salt with a carboxyl group; a polyamine compound forming an amide bond with a carboxyl group; Examples thereof include epoxy compounds and polyols that form an ester bond with a carboxyl group; and polyisocyanate compounds that form an amide bond with a carboxyl group. Of these, polyisocyanate compounds are preferable.
  • the active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by being irradiated with an active energy ray such as an ultraviolet ray or an electron beam, and has adhesiveness even before irradiation with the active energy ray. It is a pressure-sensitive adhesive composition having a property that it can be brought into close contact with an adherend such as the above, and can be cured by irradiation with an active energy ray to adjust the adhesion.
  • the active energy ray-curable pressure-sensitive adhesive composition is preferably UV-curable.
  • the active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, if necessary, a photopolymerization initiator, a photosensitizer and the like may be contained.
  • the pressure-sensitive adhesive composition includes fine particles for imparting light-scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, tackifiers, fillers (metal powder and other inorganic powders). Etc.), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, corrosion inhibitors, photopolymerization initiators, and other additives.
  • the formed pressure-sensitive adhesive layer can be irradiated with an active energy ray to give a cured product having a desired degree of curing.
  • each bonding layer 20 is not particularly limited and is, for example, 3 ⁇ m or more and 100 ⁇ m or less, preferably 5 ⁇ m or more and 50 ⁇ m or less, and may be 20 ⁇ m or more.
  • a transparent base film I (polyamideimide film, thickness 50 ⁇ m) is coated with a composition for a hard coat layer, and then a solvent is dried and UV-cured to form a front plate I having a hard coat layer on one side ( The thickness was 60 ⁇ m, the tensile elastic modulus was 7 GPa, and the length was 177 mm ⁇ width 105 mm).
  • the composition for the hard coat layer comprises 30 parts by weight of a multifunctional acrylate (MIWON Specialty Chemical, MIRAMER M340), 50 parts by weight of nanosilica sol (average particle diameter 12 nm, solid content 40%) dispersed in propylene glycol monomethyl ether, ethyl acetate. 17 parts by weight, 2.7 parts by weight of a photopolymerization initiator (Ciba Co., I184), and 0.3 parts by weight of a fluorine-based additive (Shin-Etsu Chemical Co., Ltd., KY1203) were blended using a stirrer to obtain polypropylene ( A composition for a hard coat layer was produced by filtering with a filter made of PP) material.
  • MIWON Specialty Chemical, MIRAMER M340 multifunctional acrylate
  • nanosilica sol average particle diameter 12 nm, solid content 40%
  • the obtained reaction liquid was cooled to room temperature, put into a large amount of methanol in a filament shape, the deposited precipitate was taken out, immersed in methanol for 6 hours, and washed with methanol. Next, the precipitate was dried under reduced pressure at 100° C. to obtain a polyamideimide resin.
  • DMAc was added to the obtained polyamide-imide resin to a concentration of 15% by mass to prepare a polyamide-imide varnish.
  • the obtained polyamide imide varnish was applied onto a smooth surface of a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") using an applicator so that the thickness of the self-supporting film was 55 ⁇ m, and the temperature was 50°C 30 After drying for 15 minutes at 140° C. for 15 minutes, a free-standing film was obtained.
  • the self-supporting film was fixed to a metal frame and further dried in the atmosphere at 300° C. for 30 minutes to obtain a polyamideimide film having a film thickness of 50 ⁇ m.
  • the polyamideimide film thus obtained was used as the base film I.
  • Front plate II A transparent base film II (polyamideimide film, thickness: 50 ⁇ m) is coated with the composition for a hard coat layer, and then the solvent is dried and UV-cured to form a front plate II having a hard coat layer formed on one side ( The thickness was 60 ⁇ m, the tensile elastic modulus was 6 GPa, and the length was 177 mm ⁇ width 105 mm).
  • the composition for the hard coat layer the same composition as that used for producing the front plate I was used.
  • the obtained reaction liquid was cooled to room temperature, put into a large amount of methanol in a filament form, the deposited precipitate was taken out, immersed in methanol for 6 hours, and washed with methanol. Next, the precipitate was dried under reduced pressure at 100° C. to obtain a polyamideimide resin.
  • DMAc was added to the obtained polyamide-imide resin to a concentration of 15% by mass to prepare a polyamide-imide varnish.
  • the obtained polyamide imide varnish was applied on a smooth surface of a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") using an applicator so that the thickness of the self-supporting film was 55 ⁇ m, and the temperature was 50° C. 30 After drying for 15 minutes at 140° C. for 15 minutes, a free-standing film was obtained.
  • the self-supporting film was fixed to a metal frame and further dried in the atmosphere at 230° C. for 30 minutes to obtain a polyamideimide film having a film thickness of 50 ⁇ m.
  • the polyamideimide film thus obtained was used as the base film II.
  • a transparent base film III (polyamideimide film, thickness 50 ⁇ m) is coated with the composition for a hard coat layer, dried by a solvent, and UV-cured to form a front plate III having a hard coat layer formed on one side ( The thickness was 60 ⁇ m, the tensile elastic modulus was 5 GPa, and the length was 177 mm ⁇ width 105 mm).
  • the hard coat layer composition used was the same as that used when the front plate I was manufactured.
  • DMAc was added to the obtained polyamide-imide resin to a concentration of 15% by mass to prepare a polyamide-imide varnish.
  • the obtained polyamide imide varnish was applied onto a smooth surface of a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") using an applicator so that the thickness of the self-supporting film was 55 ⁇ m, and the temperature was 50° C. 30 After drying for 15 minutes at 140° C. for 15 minutes, a free-standing film was obtained.
  • the self-supporting film was fixed to a metal frame and further dried in the atmosphere at 300° C. for 30 minutes to obtain a polyamideimide film having a film thickness of 50 ⁇ m.
  • the polyamideimide film thus obtained was used as the base film III.
  • a transparent base film IV (polyamideimide film, thickness 50 ⁇ m) is coated with the composition for a hard coat layer, dried with a solvent, and then UV-cured to form a front plate IV ( The thickness was 60 ⁇ m, the tensile elastic modulus was 3 GPa, and the length was 177 mm ⁇ width 105 mm).
  • the composition for the hard coat layer the same composition as that used for producing the front plate I was used.
  • the obtained reaction liquid was cooled to room temperature, put into a large amount of methanol in a filament shape, the deposited precipitate was taken out, immersed in methanol for 6 hours, and washed with methanol. Next, the precipitate was dried under reduced pressure at 100° C. to obtain a polyamideimide resin.
  • DMAc was added to the obtained polyamide-imide resin to a concentration of 15% by mass to prepare a polyamide-imide varnish.
  • the obtained polyamide imide varnish was applied onto a smooth surface of a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") using an applicator so that the thickness of the self-supporting film was 55 ⁇ m, and the temperature was 50° C. 30 After drying for 15 minutes at 140° C. for 15 minutes, a free-standing film was obtained.
  • the self-supporting film was fixed to a metal frame and further dried in the atmosphere at 300° C. for 30 minutes to obtain a polyamideimide film having a film thickness of 50 ⁇ m.
  • the polyamideimide film thus obtained was used as the base film IV.
  • the polarizing plate 1 was produced as follows. First, a photo-alignment film is formed on a 25 ⁇ m-thick triacetyl cellulose (TAC) film, and then a composition containing a dichroic dye and a polymerizable liquid crystal compound is applied to the photo-alignment film, which is then aligned and cured to form a 2 ⁇ m-thick film. A polarizer was obtained. An overcoat layer was formed on the polarizer. The overcoat layer was prepared by applying a resin composition containing polyvinyl alcohol and water and drying at 80° C. for 3 minutes. The thickness of the overcoat layer was 1.0 ⁇ m.
  • TAC triacetyl cellulose
  • a retardation film including a layer in which a liquid crystal compound is polymerized and cured via a pressure-sensitive adhesive layer having a thickness of 5 ⁇ m (thickness 11 ⁇ m, layer structure: layer in which liquid crystal compound is cured and alignment film).
  • a positive C plate (thickness 3 ⁇ m) composed of a ⁇ /4 plate (thickness 3 ⁇ m)/adhesive layer (thickness 5 ⁇ m)/a liquid crystal compound cured layer and an alignment film was attached.
  • Polarizing plate 1 having a layer structure of "TAC film/polarizer/overcoat layer/adhesive layer/retardation film" was prepared (the description of the photo-alignment film is omitted). .. Polarizing plate 1 was a circularly polarizing plate.
  • a touch panel sensor I having a length of 177 mm and a width of 105 mm in which a transparent conductive layer, a separation layer, an adhesive layer, and a base material layer were laminated in this order was prepared.
  • the transparent conductive layer contained an ITO layer
  • the separation layer contained a cured layer of an acrylic resin composition
  • the total thickness of both layers was 7 ⁇ m.
  • the adhesive layer had a thickness of 3 ⁇ m.
  • the base material layer was a polyethylene terephthalate film having a thickness of 12 ⁇ m, and the toughness was 69 mJ/mm 3 .
  • a touch panel sensor II having a length of 177 mm and a width of 105 mm, in which a transparent conductive layer, a separation layer, an adhesive layer, and a base material layer were laminated in this order, was prepared.
  • the transparent conductive layer contained an ITO layer
  • the separation layer contained a cured layer of an acrylic resin composition
  • the total thickness of both layers was 7 ⁇ m.
  • the adhesive layer had a thickness of 3 ⁇ m.
  • the base material layer was a polyethylene terephthalate film having a thickness of 23 ⁇ m, and the toughness was 140 mJ/mm 3 .
  • the separation layer contained a cured layer of an acrylic resin composition contained a cured layer of an acrylic resin composition
  • the adhesive layer had a thickness of 3 ⁇ m.
  • the base material layer was a triacetyl cellulose film having a thickness of 50 ⁇ m, and the toughness was 40 mJ/mm 3 .
  • the adhesive layer had a thickness of 3 ⁇ m.
  • the base material layer was a 40 ⁇ m thick triacetyl cellulose film and had a toughness of 20 mJ/mm 3 .
  • the adhesive layer had a thickness of 3 ⁇ m.
  • the base material layer was a 25 ⁇ m thick triacetyl cellulose film and had a toughness of 6 mJ/mm 3 .
  • a touch panel sensor VI having a length of 177 mm and a width of 105 mm, in which a transparent conductive layer, a separation layer, an adhesive layer, and a base material layer were laminated in this order, was prepared.
  • the transparent conductive layer contained an ITO layer
  • the separation layer contained a cured layer of an acrylic resin composition
  • the total thickness of both layers was 7 ⁇ m.
  • the adhesive layer had a thickness of 3 ⁇ m.
  • the base material layer was a cycloolefin polymer film having a thickness of 40 ⁇ m, and the toughness was 4 mJ/mm 3 .
  • [Laminating layer I] (Meth)acrylic adhesive layer, thickness 25 ⁇ m, length 177 mm x width 105 mm ⁇ Example 1>
  • front plate I/laminating layer I/polarizing plate I (TAC film/adhesive layer/polarizer/overcoat layer/adhesive layer/retardation film)/laminating layer I/touch sensor panel I (transparent) (Electrically conductive layer/separation layer/adhesive layer/base material layer)”, laminated by using a roll bonding machine, cured in an autoclave, and the optical laminate shown in FIG.
  • An optical layered body of Example 1 having the same configuration as that of 200 was obtained.
  • An impact resistance test and a bending resistance test were performed on the obtained optical layered body. The results are shown in Table 1.
  • a crack extension rate evaluation test was performed. The results are shown in Table 2.
  • Examples 2 to 6 Comparative Examples 1 and 2> Optical laminated bodies of Examples 2 to 6 and Comparative Examples 1 and 2 were obtained in the same manner as in Example 1 except that the front plate and the touch sensor panel shown in Table 1 were used in Example 1. .. An impact resistance test and a bending resistance test were performed on the obtained optical layered body. The results are shown in Table 1. In addition, with respect to the obtained optical layered body, a crack extension rate evaluation test was performed. The results are shown in Table 2.
  • test piece The thickness of each layer (hereinafter referred to as “test piece”) was measured using a contact-type film thickness measuring device (“MS-5C” manufactured by Nikon Corporation). However, the polarizer layer and the alignment film were measured using a laser microscope (“OLS3000” manufactured by Olympus Corporation).
  • the tensile modulus of the front plate was measured as follows. A rectangular small piece having a long side of 110 mm and a short side of 10 mm was cut out from the front plate using a super cutter. Next, with the upper and lower grips of a tensile tester [Autograph AG-Xplus tester manufactured by Shimadzu Corporation], both ends of the small piece in the long side direction were sandwiched so that the distance between the grips was 5 cm, and the temperature was 23°C.
  • the small piece was pulled in the long side direction at a pulling rate of 4 mm/min, and the linear slope between 20 and 40 MPa in the obtained stress-strain curve was calculated as the tensile elastic modulus [GPa]. At this time, the thickness value measured as described above was used as the thickness for calculating the stress.
  • the toughness of the base material layer of the touch sensor panel was measured as follows in accordance with JIS K7161. A rectangular small piece having a long side of 110 mm and a short side of 10 mm was cut out from the base material layer of the touch sensor panel using a super cutter. Next, with the upper and lower grips of a tensile tester [Autograph AG-Xplus tester manufactured by Shimadzu Corporation], both ends of the small piece in the long side direction were sandwiched so that the distance between the grips was 5 cm, and the temperature was 23°C. The piece was pulled in the long side direction at a pulling rate of 4 mm/min in an environment with a relative humidity of 55%. The toughness was calculated as the integrated value of the stress-strain curve from the initial stage to the fracture.
  • ⁇ Impact resistance test> From the optical layered body 200 obtained in each of the examples and comparative examples, a small piece having a rectangular size of 150 mm long side ⁇ 70 mm short side is cut out using a super cutter, and the touch sensor panel side of the small piece is interposed with an adhesive layer. I stuck it on an acrylic board. Then, in an environment of a temperature of 23° C. and a relative humidity of 55%, with respect to the small piece, place the evaluation pen so that the pen tip is located at a distance of 10 cm from the outermost surface of the front plate of the small piece and the pen tip faces downward. It was held and the evaluation pen was dropped from that position.
  • the position of the pattern of the transparent conductive layer of the touch sensor panel is written on the front plate of the small piece, and the evaluation pen was dropped so that the pen tip was in contact with the position where the transparent conductive layer was arranged.
  • the evaluation pen a pen having a weight of 11 g and a pen tip diameter of 0.7 mm was used.
  • the small piece after the evaluation pen was dropped was visually observed and the touch sensor panel function was confirmed, and evaluated according to the following criteria. Table 1 shows the evaluation results.
  • C There is a crack. No touch sensor panel function.
  • ⁇ Flex resistance test> A flexibility test was conducted at a temperature of 25° C. according to the following procedure.
  • the optical laminates obtained in each of the examples and comparative examples were set in a bending tester (CFT-720C, manufactured by Covotech) in a flat state (non-bending state) so that the front plate side was the inner side. After bending the optical laminate so that the distance between the front plates facing each other when it was bent was 4.0 mm, a bending operation for returning to the original flat state was performed. When this bending operation was performed once, the number of times of bending was counted as one, and this bending operation was repeated.
  • the number of times of bending when cracks and/or floating of the pressure-sensitive adhesive layer occurred in the region bent by the bending operation was confirmed as the limit number of times of bending and evaluated as follows.
  • Table 1 shows the evaluation results. A: Even if the number of bends reached 200,000, the limit number of bends was not reached, B: The number of flexing cycles reached 100,000 or more and 200,000 or less, and the limit number of flexing times was reached. C: The number of flexing cycles reached 50,000 or more and less than 100,000, and the limit flexing frequency was reached. D: The limit number of flexing was reached when the number of flexing was less than 50,000.
  • the optical layered body obtained in each of the examples and comparative examples with artificial cracks was placed in a bending tester (CFT-720C, manufactured by Covotech) in a flat state (not bent), and the front plate side was After bending along the bending axis so as to be inside (bending to a position where the distance between the facing front plates is 4.0 mm), a bending operation for returning to the original flat state was performed.
  • this bending operation is performed once, it is counted as the number of times of bending, and this bending operation is repeated 1 million times.
  • the number of bending times is 100,000, 150,000, 500,000, 1 million
  • the length was measured, and the average extension speed V [mm/1000 times] was calculated based on the extension amount [mm] from the initial 1 mm.
  • the average extension speed V is calculated based on (L1/100,000 times) ⁇ 1000 times based on the extension amount L1 [mm] from the initial 1 mm when the number of bending times is 100,000 times.
  • the speed V2 calculated by (L2/150,000 times) ⁇ 1000 times based on the initial expansion amount L2 [mm] from 1 mm
  • the expansion amount L3 [mm from the initial 1 mm when the number of bending times is 500,000 times (L3/500,000 times) ⁇ 1000 times based on the speed V3 calculated from 1000 times and the amount of extension L4 [mm] from the initial 1 mm when the number of flexing times is 1 million times (L4/million times) ⁇
  • the average value of the speed V4 calculated by 1000 times was used.
  • the elongation rate of cracks was evaluated as follows. A: Average extension speed V is 0.1 mm/1000 times or less B: Average extension speed V is more than 0.1 mm/1000 times 0.5 mm/1000 times or less C: Average extension speed V is more than 0.5 mm/1000 times

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un corps stratifié optique pourvu d'une plaque de surface avant et d'un panneau de capteur tactile dans l'ordre, le corps stratifié optique ayant une excellente résistance aux chocs et une excellente résistance à la flexion. Un corps stratifié optique est pourvu d'une plaque de surface avant et d'un panneau de capteur tactile, le panneau de capteur tactile étant pourvu d'une couche électroconductrice transparente et d'une couche de substrat pour supporter la couche électroconductrice transparente, et le paramètre d'évaluation A calculé à partir de la formule (1), où a [GPa] est le module de traction de la plaque de surface avant, b [mJ/mm3] est la ténacité de la couche de substrat, et c [µm] est l'épaisseur de la couche de substrat, satisfait la relation de formule (2a).　(1) : A = a×b/c (2a) : A ≥ 1,0
PCT/JP2020/000635 2019-02-05 2020-01-10 Corps stratifié optique et dispositif d'affichage WO2020162102A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080012352.2A CN113396345B (zh) 2019-02-05 2020-01-10 光学层叠体和显示装置
KR1020217025505A KR20210121084A (ko) 2019-02-05 2020-01-10 광학 적층체 및 표시 장치

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2019-018990 2019-02-05
JP2019018990 2019-02-05
JP2019-135378 2019-07-23
JP2019135378A JP6739601B1 (ja) 2019-02-05 2019-07-23 光学積層体及び表示装置

Publications (1)

Publication Number Publication Date
WO2020162102A1 true WO2020162102A1 (fr) 2020-08-13

Family

ID=71947203

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/000635 WO2020162102A1 (fr) 2019-02-05 2020-01-10 Corps stratifié optique et dispositif d'affichage

Country Status (1)

Country Link
WO (1) WO2020162102A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008058599A (ja) * 2006-08-31 2008-03-13 Sumitomo Chemical Co Ltd 複合偏光板製品チップの製造方法
JP2015191634A (ja) * 2014-03-28 2015-11-02 大日本印刷株式会社 積層体、該積層体を用いたタッチパネル及び積層体の製造方法
WO2018179893A1 (fr) * 2017-03-30 2018-10-04 富士フイルム株式会社 Film optique, et panneau avant d'un dispositif d'affichage d'image, dispositif d'affichage d'image, miroir à fonction d'affichage d'image, panneau tactile résistif et panneau tactile capacitif comprenant chacun ledit film optique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008058599A (ja) * 2006-08-31 2008-03-13 Sumitomo Chemical Co Ltd 複合偏光板製品チップの製造方法
JP2015191634A (ja) * 2014-03-28 2015-11-02 大日本印刷株式会社 積層体、該積層体を用いたタッチパネル及び積層体の製造方法
WO2018179893A1 (fr) * 2017-03-30 2018-10-04 富士フイルム株式会社 Film optique, et panneau avant d'un dispositif d'affichage d'image, dispositif d'affichage d'image, miroir à fonction d'affichage d'image, panneau tactile résistif et panneau tactile capacitif comprenant chacun ledit film optique

Similar Documents

Publication Publication Date Title
KR102220433B1 (ko) 플렉시블 적층체 및 그것을 구비한 화상 표시 장치
JP6735891B2 (ja) フレキシブル積層体及びそれを備えた画像表示装置
CN113631363A (zh) 层叠体和显示装置
WO2020080055A1 (fr) Stratifié optique et dispositif d'affichage
KR20210077669A (ko) 광학 적층체 및 표시장치
JP6739601B1 (ja) 光学積層体及び表示装置
CN115524771A (zh) 光学层叠体和显示装置
WO2020162102A1 (fr) Corps stratifié optique et dispositif d'affichage
WO2021176989A1 (fr) Stratifié optique et dispositif d'affichage
KR20220131157A (ko) 광학 적층체 및 표시 장치
WO2020170726A1 (fr) Corps stratifié souple et dispositif d'affichage d'image équipé de celui-ci
JP2021152650A (ja) 積層体
JP7092900B2 (ja) 積層体および画像表示装置
WO2021149359A1 (fr) Empilement optique et dispositif d'affichage
WO2022255154A1 (fr) Stratifié
JP2022084613A (ja) 積層体および画像表示装置
JP2021152649A (ja) 積層体
JP2021140136A (ja) 光学積層体及び表示装置
JP2022059255A (ja) フレキシブル積層体
JP2020157579A (ja) 積層体及び表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20752519

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20217025505

Country of ref document: KR

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 20752519

Country of ref document: EP

Kind code of ref document: A1