WO2023032783A1 - 複層構造体 - Google Patents
複層構造体 Download PDFInfo
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- WO2023032783A1 WO2023032783A1 PCT/JP2022/031857 JP2022031857W WO2023032783A1 WO 2023032783 A1 WO2023032783 A1 WO 2023032783A1 JP 2022031857 W JP2022031857 W JP 2022031857W WO 2023032783 A1 WO2023032783 A1 WO 2023032783A1
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- WIPO (PCT)
- Prior art keywords
- layer
- adhesive
- thickness
- polarizing plate
- bonding layer
- Prior art date
Links
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- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
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- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
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- 238000007500 overflow downdraw method Methods 0.000 description 1
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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
- B32B7/023—Optical properties
-
- 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
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
-
- 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
- G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—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 comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
-
- 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
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
Definitions
- the present invention relates to a multilayer structure.
- a multilayer structure in which two or more layers are laminated is known.
- An example is a multilayer structure in which an adhesive layer, a resin layer, an adhesive layer, and a glass layer are laminated in this order.
- the glass layer preferably has a thickness of 30 ⁇ m to 300 ⁇ m.
- the thickness and elastic modulus of the pressure-sensitive adhesive layer are defined in a wide range.
- the present invention has been made in view of the above points, and an object of the present invention is to provide a multilayer structure capable of suppressing the extension of cracks even if cracks occur in the glass layer.
- the multilayer structure includes a polarizing plate, a glass layer laminated on one side of the polarizing plate via an adhesive layer, and an optical display laminated on the other side of the polarizing plate via a bonding layer. and the thickness of the glass layer is 10 ⁇ m or more and 300 ⁇ m or less, and the thickness x of the bonding layer and the elastic modulus y of the bonding layer at 85° C. satisfy y ⁇ (299/60)x ⁇ Meets 296/3.
- FIG. 1 is a cross-sectional view illustrating a multilayer structure according to this embodiment;
- FIG. It is a sectional view showing an example of a polarizing plate concerning this embodiment.
- FIG. 3 is a diagram showing the relationship between the thickness and elastic modulus of a bonding layer and the crack extension rate of a glass layer;
- FIG. 1 is a cross-sectional view illustrating a multilayer structure according to this embodiment.
- the multilayer structure 1 has an optical display 10 , a bonding layer 20 , a polarizing plate 30 , an adhesive layer 40 and a glass layer 50 .
- the glass layer 50 is laminated on one side of the polarizing plate 30 with the adhesive layer 40 interposed therebetween, and the optical display 10 is laminated on the other side of the polarizing plate 30 with the bonding layer 20 interposed therebetween.
- the multilayer structure 1 may be composed of the bonding layer 20, the polarizing plate 30, the adhesive layer 40, and the glass layer 50.
- a person who obtains the laminate of the bonding layer 20, the polarizing plate 30, the adhesive layer 40, and the glass layer 50 attaches the bonding layer 20 side of the laminate to the upper surface 10a of the optical display 10. and can be used for display devices and the like.
- the planar shape of the multilayer structure 1 (the shape viewed from the normal direction of the upper surface 10a of the optical display 10) is, for example, a rectangular shape.
- the planar shape of the multilayer structure 1 is not limited to this, and may be a circular shape, an elliptical shape, a combination thereof, or any other appropriate shape.
- the optical display 10 is not particularly limited as long as it can display predetermined information.
- Examples of the optical display 10 include a display having any one of liquid crystal, organic EL (Organic Electro-Luminescence), inorganic EL (Inorganic Electro-Luminescence), LED (Light Emitting Diode), and quantum dots. Note that the term "LED” used herein also includes micro LEDs.
- the thickness of the optical display 10 is, for example, 0.4 mm to 0.7 mm.
- the elastic modulus of the optical display 10 is, for example, 50 GPa to 100 GPa.
- the optical display 10 has a liquid crystal layer sandwiched between two transparent substrates.
- the liquid crystal layer includes, for example, liquid crystal molecules that are homogeneously aligned in the absence of an electric field.
- an IPS liquid crystal layer is preferably used, but a TN type, STN type, ⁇ type, VA type liquid crystal layer, or the like may also be used.
- the thickness of the liquid crystal layer is, for example, about 1.5 ⁇ m to 4 ⁇ m.
- the two transparent substrates have, for example, the same thickness.
- the two transparent substrates are made of glass, for example.
- the bonding layer 20 is arranged between the optical display 10 and the polarizing plate 30 . Any adhesive or adhesive can be used as the bonding layer 20 . A suitable thickness and a suitable elastic modulus of the bonding layer 20 will be described later.
- the pressure-sensitive adhesive refers to a layer that has adhesiveness at room temperature and adheres to an adherend with light pressure. Therefore, even when the adherend adhered to the adhesive is peeled off, the adhesive retains practical adhesive strength.
- an adhesive refers to a layer that can bind substances by being interposed between them. Therefore, when the adherend adhered to the adhesive is peeled off, the adhesive does not have practical adhesive strength.
- an adhesive for example, an adhesive whose base polymer is acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine-based polymer, rubber-based polymer, or the like is used.
- an acrylic adhesive is preferably used. This is because acrylic pressure-sensitive adhesives are excellent in optical transparency, exhibit appropriate wettability, cohesion, and adhesive properties, and can be excellent in weather resistance, heat resistance, and the like.
- an acrylic pressure-sensitive adhesive made of an acrylic polymer having 4 to 12 carbon atoms is preferred.
- an adhesive for the bonding layer 20 for example, a polyester adhesive, a polyurethane adhesive, a polyvinyl alcohol adhesive, or an epoxy adhesive is used.
- the adhesive is a thermosetting adhesive, it can exert its peel resistance by being cured (hardened) by heating.
- the adhesive is a photocurable adhesive such as an ultraviolet curable adhesive, peeling resistance can be exhibited by curing the adhesive by irradiating it with light such as ultraviolet rays.
- the adhesive is a moisture-curable adhesive, it can be cured by reacting with moisture in the air, etc., so that it can be cured even if left unattended to exhibit peeling resistance.
- the polarizing plate 30 is laminated on the upper surface 10a of the optical display 10 with the bonding layer 20 interposed therebetween. As shown in FIG. 2, the polarizing plate 30 has a polarizer 301, a first protective film 302 and a second protective film 303, for example.
- the first protective film 302 is arranged on the adhesive layer 40 side of the polarizer 301
- the second protective film 303 is arranged on the bonding layer 20 side of the polarizer 301 .
- the polarizing plate 30 may have only one of the first protective film 302 and the second protective film 303 .
- the thickness of the polarizing plate 30 is preferably 5 ⁇ m to 300 ⁇ m, more preferably 10 ⁇ m to 250 ⁇ m, even more preferably 25 ⁇ m to 200 ⁇ m, particularly preferably 25 ⁇ m to 100 ⁇ m.
- the elastic modulus of the polarizing plate 30 is preferably 1 GPa or more, more preferably 1 GPa to 10 GPa, still more preferably 2 GPa to 7 GPa, and particularly preferably 2 GPa to 5 GPa.
- the shape of the polarizing plate 30 is not particularly limited, and an appropriate shape can be adopted depending on the purpose.
- One example is a rectangular shape having long sides and short sides.
- the absorption axis direction of the polarizer 301 of the polarizing plate 30 and the long side or short side of the polarizing plate 30 are preferably substantially parallel.
- the term “substantially parallel” is a concept that includes not only the case of being strictly parallel but also the case where the angle formed by both lines is ⁇ 10° (preferably ⁇ 5°).
- the thickness of the polarizer 301 is not particularly limited, and an appropriate thickness can be adopted depending on the purpose.
- the thickness of the polarizer 301 is typically about 1 ⁇ m to 80 ⁇ m.
- a thin polarizer may be used as the polarizer 301.
- the thickness of the polarizer 301 is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, still more preferably 10 ⁇ m or less, and particularly preferably. is 6 ⁇ m or less.
- the polarizer 301 preferably exhibits absorption dichroism at any wavelength from 380 nm to 780 nm.
- the single transmittance of the polarizer is preferably 40.0% or higher, more preferably 41.0% or higher, even more preferably 42.0% or higher, and particularly preferably 43.0% or higher.
- the degree of polarization of the polarizer 301 is preferably 99.8% or more, more preferably 99.9% or more, still more preferably 99.95% or more.
- the polarizer 301 is preferably an iodine polarizer.
- the iodine-based polarizer can be composed of a polyvinyl alcohol-based resin (hereinafter referred to as "PVA-based resin") film containing iodine.
- PVA-based resin polyvinyl alcohol-based resin
- the PVA-based resin that forms the PVA-based resin film is not particularly limited, and a suitable resin can be employed depending on the purpose. Examples thereof include polyvinyl alcohol and ethylene-vinyl alcohol copolymer.
- the first protective film 302 and the second protective film 303 are not particularly limited, and appropriate resin films can be used depending on the purpose.
- materials for forming the first protective film 302 and the second protective film 303 include polyester resins such as polyethylene terephthalate (PET), cellulose resins such as triacetylcellulose (TAC), and cycloolefin resins such as norbornene resins.
- PET polyethylene terephthalate
- TAC triacetylcellulose
- cycloolefin resins such as norbornene resins.
- examples include resins, olefin resins such as polyethylene and polypropylene, and (meth)acrylic resins. Among these, cellulose-based resins and (meth)acrylic-based resins are preferred.
- “(meth)acrylic resin” refers to acrylic resin and/or methacrylic resin.
- the thickness of the first protective film 302 and the second protective film 303 is preferably 4 ⁇ m to 250 ⁇ m, more preferably 5 ⁇ m to 150 ⁇ m, still more preferably 10 ⁇ m to 100 ⁇ m, and particularly preferably 10 ⁇ m to 50 ⁇ m. .
- the elastic modulus of the first protective film 302 and the second protective film 303 is 1 GPa or more, preferably 1 GPa to 10 GPa, more preferably 1.8 GPa to 7 GPa, still more preferably 2 GPa to 5 GPa.
- the adhesive layer 40 is arranged between the polarizing plate 30 and the glass layer 50 .
- the adhesive layer 40 is preferably made of a material with high visible light transmittance.
- the thickness of the adhesive layer 40 is, for example, 0.1 ⁇ m or more and 25 ⁇ m or less.
- a polyester-based adhesive, a polyurethane-based adhesive, a polyvinyl alcohol-based adhesive, or an epoxy-based adhesive is used as the adhesive layer 40.
- the glass layer 50 is laminated on the polarizing plate 30 with the adhesive layer 40 interposed therebetween.
- the glass layer 50 is not particularly limited, and a suitable one can be adopted depending on the purpose.
- Examples of the glass layer 50 include soda-lime glass, boric acid glass, aluminosilicate glass, quartz glass, etc. according to classification according to composition. Further, according to the classification by alkali component, non-alkali glass and low-alkali glass can be mentioned.
- the content of alkali metal components (eg, Na 2 O, K 2 O, Li 2 O) in the glass is preferably 15% by weight or less, more preferably 10% by weight or less.
- the thickness of the glass layer 50 is preferably 10 ⁇ m or more, considering the surface hardness, airtightness, and corrosion resistance of the glass. Moreover, since it is desirable that the glass layer 50 has flexibility like a film, the thickness of the glass layer 50 is preferably 300 ⁇ m or less. The thickness of the glass layer 50 is more preferably 20 ⁇ m or more and 200 ⁇ m or less, and particularly preferably 30 ⁇ m or more and 150 ⁇ m or less.
- the light transmittance of the glass layer 50 at a wavelength of 550 nm is preferably 85% or more.
- the refractive index of the glass layer 50 at a wavelength of 550 nm is preferably 1.4 to 1.65.
- the density of the glass layer 50 is preferably 2.3 g/cm 3 to 3.0 g/cm 3 , more preferably 2.3 g/cm 3 to 2.7 g/cm 3 .
- the method of forming the glass layer 50 is not particularly limited, and an appropriate method can be adopted depending on the purpose.
- the glass layer 50 is formed by heating a mixture containing a main raw material such as silica or alumina, an antifoaming agent such as mirabilite or antimony oxide, and a reducing agent such as carbon at a temperature of about 1400°C to 1600°C. It can be produced by melting, molding into a thin plate, and then cooling.
- Examples of the method for forming the glass layer 50 include a slot down draw method, a fusion method, a float method, and the like.
- the glass layer formed into a plate shape by these methods may be chemically polished with a solvent such as hydrofluoric acid, if necessary, in order to thin the plate or improve smoothness.
- a functional layer such as an antifouling layer, an antireflection layer, a conductive layer, a reflective layer, and a decorative layer may be provided on the upper surface of the glass layer 50 (the side on which the adhesive layer 40 is not formed).
- the polarizing plate 30 and the glass layer 50 are laminated with the adhesive layer 40 interposed therebetween.
- a roll-to-roll process can be employed. That is, while conveying the polarizing plate 30 wound on the roll and the glass layer 50 wound on the roll in the same direction, they are sandwiched and pressed between two rolls arranged to face each other, and the adhesive layer 40 is formed. Lamination through.
- the laminate of the polarizing plate 30, the adhesive layer 40, and the glass layer 50 is cut using a laser or the like into individual pieces. Then, the laminated body of the polarizing plate 30, the adhesive layer 40, and the glass layer 50, which are separated into pieces, is laminated on the upper surface 10a of the optical display 10 via the bonding layer 20, thereby completing the multilayer structure 1. do.
- E, ⁇ , and d are approximately as shown in Table 1.
- the polarizing plate 30 has characteristics corresponding to a general film.
- the tensile force F of the optical display 10 having a larger value of E ⁇ d is larger than the tensile force F of the polarizing plate 30. Recognize. From this, when the multilayer structure 1 is placed in a high-temperature environment (for example, 85° C.), the main cause of the extension of cracks in the glass layer 50 is the tensile force F generated in the optical display 10 due to thermal expansion. presumed to be.
- the inventors made it difficult for the glass layer 50 to follow the thermal expansion of the optical display 10 by thinning the bonding layer 20 and increasing its elasticity in order to suppress the extension of cracks in the glass layer 50 . I thought that it was effective and conducted an experiment.
- the sample of the multi-layer structure used in the experiment had a rectangular planar shape and was 150 mm long and 210 mm wide. Further, instead of the optical display 10, a plate glass with a thickness of 400 ⁇ m was used assuming the optical display 10.
- the thickness of the polarizing plate 30 was set to 85 ⁇ m
- the thickness of the adhesive layer 40 was set to 1.5 ⁇ m
- the thickness of the glass layer 50 was set to 100 ⁇ m.
- the elastic modulus of the plate glass, which is assumed to be the optical display 10 is 70 GPa
- the elastic modulus of the polarizing plate 30 is 3 GPa
- the elastic modulus of the adhesive layer 40 is 7 GPa
- the elastic modulus of the glass layer 50 is 70 GPa.
- a plurality of samples of the multilayer structure having different values of the thickness and elastic modulus of the bonding layer 20 were prepared, and a plurality of cracks having a length of about 15 mm in plan view and penetrating in the thickness direction were formed in the glass layer 50 in advance. formed. Then, after storing the sample of the multilayer structure for 15 minutes in an environment of 85° C., the crack extension rate in plan view was measured. In addition, planar view means viewing from the normal direction of the upper surface of the glass layer 50 .
- the crack extension rate is the number of extended cracks/the number of formed cracks. For example, when 100 cracks are formed and 19 cracks are extended, the crack extension rate is 19%. If the crack extension rate is 10% or less, it is considered that there is no practical problem when the multilayer structure 1 is used in a display device or the like.
- the elastic modulus was measured by a nanoindentation method using a nanoindenter (Triboindenter manufactured by Hysitron Inc.). Conical (spherical indenter: radius of curvature 10 ⁇ m) was used as the indenter, and the elastic modulus was measured by the single indentation method at room temperature and 85° C. under the measurement conditions of an indentation depth of about 2 ⁇ m.
- Table 2 and FIG. 3 show the measurement results of the crack extension rate.
- the elastic modulus in Table 2 and FIG. 3 is the elastic modulus at 85° C. measured by the nanoindentation method.
- the bonding layer 20 with a thickness of 1 ⁇ m is formed using an adhesive, and the bonding layers 20 with other thicknesses are formed using an adhesive.
- the elastic modulus of the bonding layer 20 with a thickness of 1 ⁇ m is significantly higher than the elastic modulus of the bonding layers 20 with other thicknesses.
- FIG. 3 shows that the larger the diameter of the circle, the higher the crack extension rate.
- the elastic modulus of the bonding layer 20 with a thickness of 1 ⁇ m is significantly higher than those of other thicknesses, so it is shown outside the graph for convenience.
- the crack extension rate is 10% or less on the arrow side of the inclined straight line in FIG. 3, and it can be said that the multilayer structure can be used practically. That is, if the thickness of the bonding layer 20 is x [ ⁇ m] and the elastic modulus of the bonding layer 20 is y [10 4 Pa], satisfying y ⁇ (299/60)x ⁇ 296/3 allows the glass layer 50 Crack extension can be suppressed.
- the elastic modulus of the bonding layer 20 can be varied, for example, by adjusting the monomer composition (molecular weight, crosslink density, glass transition temperature, etc.).
- the monomer composition molecular weight, crosslink density, glass transition temperature, etc.
- the thickness can be in the range of 0.1 ⁇ m or more and 5 ⁇ m or less, and the elastic modulus can be in the range of 1 GPa or more.
- the inventors have found that if the dimensional change rate of the polarizing plate 30 is equal to or less than a predetermined percentage, the extension of cracks can be suppressed when the glass layer 50 is cracked. Obtained.
- the polarizing plate 30 alone may be annealed under predetermined conditions.
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Abstract
Description
光学ディスプレイ10は、所定の情報を表示可能なディスプレイであれば特に限定されない。光学ディスプレイ10としては、例えば、液晶、有機EL(Organic Electro-Luminescence)、無機EL(Inorganic Electro-Luminescence)、LED(Light Emitting Diode)、量子ドットのいずれかの素子を有するディスプレイが挙げられる。なお、ここでいうLEDは、マイクロLEDも含む。
接合層20は、光学ディスプレイ10と偏光板30との間に配置される。接合層20としては、任意の粘着剤又は接着剤を使用できる。接合層20の好適な厚さ、及び好適な弾性率については後述する。
偏光板30は、光学ディスプレイ10の上面10aに接合層20を介して積層されている。図2に示すように、偏光板30は、例えば、偏光子301、第1保護フィルム302、及び第2保護フィルム303を有する。第1保護フィルム302は、偏光子301の接着剤層40側に配置され、第2保護フィルム303は、偏光子301の接合層20側に配置される。偏光板30は、第1保護フィルム302及び第2保護フィルム303のいずれか一方のみを有してもよい。
偏光子301の厚さは、特に限定はなく、目的に応じて適切な厚さを採用できる。偏光子301の厚さは、代表的には、1μm~80μm程度である。偏光子301として薄型の偏光子を用いてもよく、この場合、偏光子301の厚さは、好ましくは20μm以下であり、より好ましくは15μm以下であり、更に好ましくは10μm以下であり、特に好ましくは6μm以下である。
第1保護フィルム302及び第2保護フィルム303としては、特に限定はなく、目的に応じて適切な樹脂フィルムを採用できる。第1保護フィルム302及び第2保護フィルム303の形成材料としては、例えば、ポリエチレンテレフタレート(PET)等のポリエステル系樹脂、トリアセチルセルロース(TAC)等のセルロース系樹脂、ノルボルネン系樹脂等のシクロオレフィン系樹脂、ポリエチレン、ポリプロピレン等のオレフィン系樹脂、(メタ)アクリル系樹脂等が挙げられる。これらの中でも、好ましくは、セルロース系樹脂や(メタ)アクリル系樹脂である。なお、「(メタ)アクリル系樹脂」とは、アクリル系樹脂及び/又はメタクリル系樹脂をいう。
接着剤層40は、偏光板30とガラス層50との間に配置される。接着剤層40は、可視光透過率が高い材料から形成されていることが好ましい。接着剤層40の厚さは、例えば、0.1μm以上25μm以下である。接着剤層40としては、例えば、ポリエステル系接着剤、ポリウレタン系接着剤、ポリビニルアルコール系接着剤、エポキシ系接着剤が用いられる。
ガラス層50は、接着剤層40を介して偏光板30上に積層されている。ガラス層50は、特に限定はなく、目的に応じて適切なものを採用できる。ガラス層50は、組成による分類によれば、例えば、ソーダ石灰ガラス、ホウ酸ガラス、アルミノ珪酸ガラス、石英ガラス等が挙げられる。又、アルカリ成分による分類によれば、無アルカリガラス、低アルカリガラスが挙げられる。上記ガラスのアルカリ金属成分(例えば、Na2O、K2O、Li2O)の含有量は、好ましくは15重量%以下であり、更に好ましくは10重量%以下である。
まず、偏光板30とガラス層50を、接着剤層40を介して積層する。積層には、例えば、ロールツーロールプロセスを採用できる。つまり、ロールに巻かれた偏光板30とロールに巻かれたガラス層50とを同一方向に搬送しながら、対向して配置された2つのロールの間に挟んで押圧し、接着剤層40を介して積層する。
複層構造体1の製造工程において、偏光板30と接着剤層40とガラス層50の積層体を個片化する際には、ガラス層50にクラックが入らないような条件により切断が行われる。しかし、万一、切断工程でガラス層50に微小なクラックが入ると、光学ディスプレイ10と接合された後に複層構造体1が高温環境(例えば、85℃)に置かれた場合に、ガラス層50のクラックが伸展するおそれがある。
10 光学ディスプレイ
10a 上面
20 接合層
30 偏光板
40 接着剤層
50 ガラス層
301 偏光子
302 第1保護フィルム
303 第2保護フィルム
Claims (5)
- 偏光板と、
前記偏光板の一方の側に接着剤層を介して積層されたガラス層と、
前記偏光板の他方の側に接合層を介して積層された光学ディスプレイと、を有し、
前記ガラス層の厚さは、10μm以上300μm以下であり、
前記接合層の厚さxと前記接合層の85℃における弾性率yは、y≧(299/60)x-296/3を満たす、複層構造体。 - 前記接合層は、粘着剤からなり、
前記接合層の厚さは、50μm以下である、請求項1に記載の複層構造体。 - 前記接合層の弾性率は、500×104Pa以下である、請求項2に記載の複層構造体。
- 前記接合層は、接着剤からなり、
前記接合層の厚さは、5μm以下である、請求項1に記載の複層構造体。 - 前記接合層は、接着剤からなり、
前記接合層の弾性率は、1GPa以上である、請求項4に記載の複層構造体。
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