WO2017010499A1 - 光学積層体 - Google Patents
光学積層体 Download PDFInfo
- Publication number
- WO2017010499A1 WO2017010499A1 PCT/JP2016/070641 JP2016070641W WO2017010499A1 WO 2017010499 A1 WO2017010499 A1 WO 2017010499A1 JP 2016070641 W JP2016070641 W JP 2016070641W WO 2017010499 A1 WO2017010499 A1 WO 2017010499A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thin glass
- polarizing plate
- polarizer
- optical laminate
- resin
- Prior art date
Links
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Images
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
-
- 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
- B32B2307/70—Other properties
- B32B2307/732—Dimensional 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
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
-
- 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
-
- 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
- B32B2457/202—LCD, i.e. liquid crystal displays
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
Definitions
- the present invention relates to an optical laminate.
- it is related with the optical laminated body containing a polarizing plate.
- a protective material for protecting the display device is disposed on the outermost surface side of these devices.
- the display devices provided in the above-mentioned devices that are often carried around or operated by hand are increasingly required to reduce weight and improve impact resistance, and a protective material capable of meeting the requirements is required. . Further, from the viewpoint of reducing the weight of the entire display device, a thin protective material having both a protective function and an optical function is required.
- a glass plate or a plastic plate is used (for example, Patent Document 1).
- the glass plate tempered glass having higher strength than normal glass is used.
- glass plates are excellent in impact resistance and hardness, there is a problem that the specific gravity is high and heavy.
- the plastic plate a material having excellent transparency such as polymethyl methacrylate and polycarbonate can be used.
- a plastic plate is lighter than a glass plate, when a plastic plate is used, it is difficult to achieve both impact resistance and hardness required as a protective material.
- the present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide an optical laminate that can contribute to weight reduction of a display device and improvement in impact resistance.
- the optical layered body of the present invention comprises a thin glass having a thickness of 100 ⁇ m or less and a polarizing plate disposed on one side of the thin glass, the polarizing plate comprising a polarizer and the thin glass of the polarizer And a protective film disposed on the side surface.
- the optical layered body of the present invention further includes an adhesive layer between the thin glass and the polarizing plate.
- the adhesive layer includes an epoxy resin.
- the elastic modulus at 23 ° C. of the protective film is 1.5 GPa to 10 GPa.
- the optical layered body of the present invention further includes an antireflection layer, and the antireflection layer is disposed on the opposite side of the thin glass from the polarizing plate.
- an optical laminate having a polarization function can be provided.
- the optical laminate is lightweight, high hardness, and excellent in impact resistance.
- the optical laminate of the present invention can be suitably used as a front plate of a display device, and can contribute to weight reduction of the display device and improvement in impact resistance while exhibiting a polarization function.
- the optical laminated body of this invention is excellent in flexibility, it can be provided with the form of a roll and is excellent also in handleability.
- the optical laminated body 100 includes a thin glass 10 having a thickness of 100 ⁇ m or less and a polarizing plate 20 disposed on one side of the thin glass 10.
- the polarizing plate 20 includes a polarizer 21 and a protective film 22 disposed on the surface of the polarizer 21 on the thin glass 10 side (that is, between the polarizer 21 and the thin glass 10).
- the polarizing plate may further include a protective film disposed on the surface of the polarizer opposite to the thin glass.
- the thin glass 10 and the polarizing plate 20 are laminated via the adhesive layer 30.
- the optical laminated body 100 of the present invention includes the thin glass 10, the hardness is high. Moreover, the optical laminated body 100 of this invention is provided with a polarizing plate on one side of the thin glass 10 so that the thin glass 10 can be prevented from being damaged and is excellent in impact resistance. In the present invention, the impact applied to the surface of the thin glass (the surface opposite to the polarizing plate) can be effectively released to the polarizing plate side, so that it is considered excellent in impact resistance as described above. . Such an effect becomes conspicuous when the polarizing plate has a protective film or when a thin glass and a polarizing plate are laminated via an adhesive layer.
- the thickness of the thin glass can be made very thin, and as a result, a lightweight optical laminate can be obtained.
- the optical laminate having excellent impact resistance, light weight, and high hardness can be suitably used as a front plate of an image display device for mobile use.
- the thin glass 10 has a function of protecting the polarizing plate 20. That is, in the present invention, the thin glass 10 and the polarizing plate 20 protect each other. Therefore, it is possible to reduce the number of protective members, and a lightweight and thin optical laminate can be obtained.
- thin glass has high gas barrier properties, and in the optical laminate of the present invention configured so that the thin glass protects the polarizing plate, deterioration of the polarizer contained in the polarizing plate is prevented.
- the thickness of the optical laminate of the present invention is preferably 1 ⁇ m to 300 ⁇ m, more preferably 10 ⁇ m to 200 ⁇ m, and more preferably 20 ⁇ m to 150 ⁇ m.
- the optical layered body of the present invention may further include other layers.
- other layers include an antireflection layer, an antiglare layer, an antistatic layer, and a conductive layer.
- a separator may be arranged on the surface of the adhesive layer. The separator can protect the pressure-sensitive adhesive layer until the optical laminate is put into practical use.
- the optical laminate of the present invention is provided in roll form. It is one of the achievements of the present invention to provide an optical layered body that has high hardness and is flexible enough to be wound into a roll.
- the thin glass As long as the said thin glass is a plate-shaped thing, arbitrary appropriate things may be employ
- the thin glass include soda-lime glass, borate glass, aluminosilicate glass, and quartz glass according to the classification according to the composition.
- category by an alkali component an alkali free glass and a low alkali glass are mentioned.
- the content of alkali metal components (for example, Na 2 O, K 2 O, Li 2 O) in the glass is preferably 15% by weight or less, and more preferably 10% by weight or less.
- the thickness of the thin glass is 100 ⁇ m or less, preferably 80 ⁇ m or less, more preferably 50 ⁇ m or less, still more preferably 40 ⁇ m or less, and particularly preferably 35 ⁇ m or less.
- the minimum of the thickness of the said thin glass becomes like this. Preferably it is 5 micrometers or more, More preferably, it is 20 micrometers or more.
- the light transmittance of the thin glass at a wavelength of 550 nm is preferably 85% or more.
- the refractive index of the thin glass at a wavelength of 550 nm is preferably 1.4 to 1.65.
- the density of the thin glass 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 . If it is thin glass of the said range, a lightweight optical laminated body will be obtained.
- the above thin glass is a mixture of 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 1400 ° C to 1600 ° C. Then, after forming into a thin plate shape, it is produced by cooling.
- the method for forming the thin glass include a slot down draw method, a fusion method, and a float method.
- the thin glass formed into a plate shape by these methods may be chemically polished with a solvent such as hydrofluoric acid, if necessary, in order to reduce the thickness or improve the smoothness.
- the commercially available thin glass may be used as it is, or a commercially available thin glass may be polished to have a desired thickness.
- Examples of commercially available thin glass include “7059”, “1737” or “EAGLE2000” manufactured by Corning, “AN100” manufactured by Asahi Glass, “NA-35” manufactured by NH Techno Glass, and “OA-” manufactured by Nippon Electric Glass. 10 ”,“ D263 ”or“ AF45 ”manufactured by Schott Corporation.
- the polarizing plate includes a polarizer.
- the polarizing plate preferably further includes a protective film on one side or both sides of the polarizer.
- the polarizing plate includes a protective film only on the thin glass side of the polarizer (that is, between the polarizer and the thin glass). If it is such a structure, it is excellent in durability of a polarizer and can obtain a lightweight polarizing plate. Moreover, the protective effect of the said thin glass can be heightened with a protective film.
- the thickness of the polarizer is not particularly limited, and an appropriate thickness can be adopted depending on the purpose.
- the thickness is typically about 1 ⁇ m to 80 ⁇ m.
- a thin polarizer is used, and the thickness of the polarizer is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, further preferably 10 ⁇ m or less, and particularly preferably 6 ⁇ m or less. It is. By using such a thin polarizer, a thin optical laminate can be obtained.
- the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
- the single transmittance of the polarizer is preferably 40.0% or more, more preferably 41.0% or more, further preferably 42.0% or more, and particularly preferably 43.0% or more.
- the polarization degree of the polarizer is preferably 99.8% or more, more preferably 99.9% or more, and further preferably 99.95% or more.
- the polarizer is an iodine-based polarizer. More specifically, the polarizer may be composed of a polyvinyl alcohol resin (hereinafter referred to as “PVA resin”) film containing iodine.
- PVA resin polyvinyl alcohol resin
- any appropriate resin can be adopted as the PVA resin for forming the PVA resin film.
- Examples thereof include polyvinyl alcohol and ethylene-vinyl alcohol copolymer.
- Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
- the ethylene-vinyl alcohol copolymer can be obtained by saponifying an ethylene-vinyl acetate copolymer.
- the degree of saponification of the PVA resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, more preferably 99.0 mol% to 99.93 mol%. It is.
- the degree of saponification can be determined according to JIS K 6726-1994. By using a PVA-based resin having such a saponification degree, a polarizer having excellent durability can be obtained. If the degree of saponification is too high, there is a risk of gelation.
- the average degree of polymerization of the PVA resin can be appropriately selected according to the purpose.
- the average degree of polymerization is usually 1000 to 10,000, preferably 1200 to 5000, and more preferably 1500 to 4500.
- the average degree of polymerization can be determined according to JIS K 6726-1994.
- unit the method of extending
- the production method (II) preferably, a laminate (i) having a resin base material and a polyvinyl alcohol resin layer formed on one side of the resin base material is stretched and dyed, A step of producing a polarizer.
- the laminate (i) can be formed by applying and drying a coating liquid containing a polyvinyl alcohol-based resin on a resin substrate.
- the laminate (i) may be formed by transferring a polyvinyl alcohol-based resin film onto a resin base material. Details of the production method (II) are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580, which is incorporated herein by reference.
- the protective film Any appropriate resin film may be employed as the protective film.
- the protective film forming material include polyester resins such as polyethylene terephthalate (PET), cellulose resins such as triacetyl cellulose (TAC), cycloolefin resins such as norbornene resins, and olefins such as polyethylene and polypropylene.
- polyester resins such as polyethylene terephthalate (PET)
- cellulose resins such as triacetyl cellulose (TAC)
- cycloolefin resins such as norbornene resins
- olefins such as polyethylene and polypropylene.
- resins and (meth) acrylic resins include resins and (meth) acrylic resins. Of these, polyethylene terephthalate (PET) is preferable.
- the “(meth) acrylic resin” refers to an acrylic resin and / or a methacrylic resin.
- a (meth) acrylic resin having a glutarimide structure is used as the (meth) acrylic resin.
- (meth) acrylic resins having a glutarimide structure include, for example, JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, and JP-A-2006-328329.
- the resin film constituting the protective film has an ultraviolet absorbing ability.
- a resin film can be obtained, for example, by including any appropriate ultraviolet absorber.
- the ultraviolet absorber include oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, nickel complex compounds, triazine compounds, and the like.
- the content ratio of the ultraviolet absorber in the resin film is preferably 0.01 to 30 parts by weight, more preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the resin film. . If it is such a range, the protective film which has sufficient ultraviolet absorptivity can be formed, and the polarizing plate which can protect the said thin glass effectively can be obtained.
- the resin film constituting the protective film is formed by any appropriate method.
- the film forming method include a melt extrusion method, a solution casting method (solution casting method), a calendar method, and a compression molding method.
- the melt extrusion method is preferable.
- the resin film may be subjected to a stretching treatment.
- the protective film and the polarizer are laminated via any appropriate adhesive layer.
- the resin base material used at the time of producing the polarizer can be peeled off before or after the protective film and the polarizer are laminated.
- the thickness of the protective film is preferably 5 ⁇ m to 55 ⁇ m, more preferably 10 ⁇ m to 50 ⁇ m, and still more preferably 15 ⁇ m to 45 ⁇ m.
- the elastic modulus of the protective film at 23 ° C. is preferably 1.5 GPa to 10 GPa, more preferably 1.8 GPa to 9 GPa. If it is such a range, the polarizing plate which can protect the said thin glass effectively can be obtained.
- the elastic modulus in the present invention can be measured by dynamic viscoelastic spectrum measurement.
- the protective film has a fracture toughness value at 25 ° C. of 1.5 MPa ⁇ m 1/2 to 10 MPa ⁇ m 1/2 , preferably 2 MPa ⁇ m 1/2 to 6 MPa ⁇ m 1/2 , and more preferably Is 2 MPa ⁇ m 1/2 to 5 MPa ⁇ m 1/2 . If the fracture toughness value of the protective film is in such a range, the protective film has sufficient tenacity, so that the thin glass is reinforced to prevent the progress and breakage of cracks in the thin glass, and has excellent flexibility. An optical laminate can be obtained.
- the linear expansion coefficient of the protective film is preferably greater than 0 / ° C., more preferably 1.0 ⁇ 10 ⁇ 6 / ° C. to 10 ⁇ 10 ⁇ 6 / ° C., and even more preferably 4.0 ⁇ 10 ⁇ 6. / ° C. to 50 ⁇ 10 ⁇ 6 / ° C.
- a linear expansion coefficient is calculated
- the optical laminate of the present invention may further include a resin film on the side opposite to the thin glass polarizing plate.
- the resin film is releasably laminated (eg, via any suitable adhesive layer) to protect the thin glass until the optical laminate of the present invention is ready for use.
- thermoplastic resins examples include thermoplastic resins and curable resins that are cured by heat or active energy rays.
- a thermoplastic resin is preferable.
- thermoplastic resins include poly (meth) acrylate resins, polycarbonate resins, polyethylene resins, polypropylene resins, polystyrene resins, polyamide resins, polyethylene terephthalate resins, polyarylate resins, polyimide resins. , Polysulfone resins, cycloolefin resins and the like. Of these, poly (meth) acrylate resins are preferred, polymethacrylate resins are more preferred, and polymethyl methacrylate resins are particularly preferred. If the resin film contains a polymethylmethacrylate resin, the effect of protecting the thin glass is enhanced. For example, it is possible to prevent the occurrence of scratches, holes, etc. even on a falling object with a sharp tip.
- the thickness of the resin film is preferably 20 ⁇ m to 1900 ⁇ m, more preferably 50 ⁇ m to 1500 ⁇ m, more preferably 50 ⁇ m to 1000 ⁇ m, and particularly preferably 50 ⁇ m to 100 ⁇ m.
- the resin film has a specific gravity of 0.9 g / cm 3 to 1.5 g / cm 3 , preferably 1 g / cm 3 to 1.3 g / cm 3 .
- the resin film may further contain any appropriate additive depending on the purpose.
- additives in the resin film include diluents, anti-aging agents, denaturing agents, surfactants, dyes, pigments, anti-discoloring agents, ultraviolet absorbers, softeners, stabilizers, plasticizers, antifoaming agents, A reinforcing agent etc. are mentioned.
- the kind, number, and amount of additives contained in the resin film can be appropriately set according to the purpose.
- the optical layered body of the present invention may further include an antireflection layer.
- the antireflection layer may be disposed on the side opposite to the thin glass polarizing plate.
- the antireflection layer may have any appropriate configuration as long as it has an antireflection function.
- the antireflection layer is a layer composed of an inorganic material.
- the material constituting the antireflection layer examples include titanium oxide, zirconium oxide, silicon oxide, and magnesium fluoride.
- a laminate obtained by alternately laminating titanium oxide layers and silicon oxide layers is used as the antireflection layer. Such a laminate has an excellent antireflection function.
- Adhesive layer The thin glass and the polarizing plate may be laminated via an adhesive layer.
- the material constituting the adhesive layer include a thermosetting resin and an active energy ray curable resin.
- Specific examples of such a resin include, for example, epoxy resins; cyclic ethers having an epoxy group, a glycidyl group, or an oxetanyl group; silicone resins; acrylic resins and mixtures thereof.
- an adhesive layer containing an epoxy resin can be formed. If an adhesive layer containing an epoxy resin is formed, an optical laminate that is less likely to break the thin glass and is superior in impact resistance can be obtained. Moreover, you may add the said coupling agent to the said contact bonding layer.
- the thickness of the adhesive layer is preferably 10 ⁇ m or less, more preferably 0.05 ⁇ m to 50 ⁇ m. If it is such a range, an optical laminated body which is hard to be damaged and excellent in impact resistance can be obtained.
- the manufacturing method of the optical stack of the production method the present invention of the optical stack any appropriate method may be employed.
- the production method includes, for example, (1) a bonding step of bonding a thin glass and a polarizing plate on one surface of a thin glass via an adhesive composition, and (2) curing the adhesive composition, A curing step of forming an adhesive layer.
- the pressure-sensitive adhesive composition preferably contains a thermosetting or photocurable adhesive.
- a thermosetting adhesive and a photocurable adhesive may be used in combination.
- an adhesive containing the resin described in the section D-3 can be used.
- the adhesive composition may further contain any appropriate additive depending on the purpose.
- the additive in the adhesive composition include a polymerization initiator, a crosslinking agent, a UV absorber, a conductive material, and a Si coupling agent.
- the laminating of the thin glass with the polarizing plate and the resin film is performed by any appropriate means. Typically, laminating is performed.
- the thin glass and the resin film may be bonded continuously by a so-called roll-to-roll.
- the roll-to-roll refers to a method in which long films (thin glass and resin film in the present invention) are roll-conveyed and bonded together with their longitudinal directions aligned.
- the method for curing the adhesive composition can be appropriately selected according to the type of the adhesive.
- the adhesive composition can be cured by ultraviolet irradiation. Irradiation conditions can be appropriately selected according to the type of adhesive, the composition of the adhesive composition, and the like. The cumulative amount of irradiation for curing the applied adhesive composition is, for example, 100 mJ / cm 2 to 2000 mJ / cm 2 .
- the adhesive is a thermosetting adhesive
- the adhesive composition is cured by heating.
- the heating conditions can be appropriately selected according to the type of adhesive, the composition of the adhesive composition, and the like.
- the heating conditions for curing the applied adhesive composition are, for example, a temperature of 100 ° C. to 200 ° C. and a heating time of 5 minutes to 30 minutes.
- the antireflection layer is formed by any appropriate method.
- the antireflection layer is formed on the thin glass by using a method such as vacuum deposition, sputtering, or ion plating.
- the antireflection layer may be formed by transferring a film having an antireflection function using the resin film described in the section E-1.
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- Physics & Mathematics (AREA)
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- General Physics & Mathematics (AREA)
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Laminated Bodies (AREA)
Abstract
Description
1つの実施形態においては、本発明の光学積層体は、前記薄ガラスと前記偏光板との間に、接着層をさらに備える。
1つの実施形態においては、上記接着層が、エポキシ系樹脂を含む。
1つの実施形態においては、上記保護フィルムの23℃における弾性率が、1.5GPa~10GPaである。
1つの実施形態においては、本発明の光学積層体は、反射防止層をさらに備え、該反射防止層が、前記薄ガラスの前記偏光板とは反対側に配置される。
図1は、本発明のひとつの実施形態による光学積層体の概略断面図である。この光学積層体100は、厚みが100μm以下の薄ガラス10と、薄ガラス10の一方の側に配置される偏光板20とを備える。偏光板20は、偏光子21と、偏光子21の薄ガラス10側の面(すなわち、偏光子21と薄ガラス10との間)に配置される保護フィルム22とを含む。図示していないが、偏光板は、偏光子の薄ガラスとは反対側の面に配置される保護フィルムをさらに含んでいてもよい。好ましくは、薄ガラス10と偏光板20とは接着層30を介して積層される。
上記薄ガラスは、板状のものであれば、任意の適切なものが採用され得る。上記薄ガラスは、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。また、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、さらに好ましくは10重量%以下である。
上記偏光板は、偏光子を備える。上記偏光板は、好ましくは、偏光子の片側または両側に保護フィルムをさらに備える。1つの実施形態においては、上記偏光板は、偏光子の上記薄ガラス側(すなわち、偏光子と薄ガラスとの間)にのみ保護フィルムを備える。このような構成であれば、偏光子の耐久性に優れ、かつ、軽量な偏光板を得ることができる。また、保護フィルムにより、上記薄ガラスの保護効果を高めることができる。
上記偏光子の厚みは特に制限されず、目的に応じて適切な厚みが採用され得る。当該厚みは、代表的には、1μm~80μm程度である。1つの実施形態においては、薄型の偏光子が用いられ、当該偏光子の厚みは、好ましくは20μm以下であり、より好ましくは15μm以下であり、さらに好ましくは10μm以下であり、特に好ましくは6μm以下である。このように薄い偏光子を用いることにより、薄型の光学積層体を得ることができる。
上記保護フィルムとしては、任意の適切な樹脂フィルムが採用され得る。保護フィルム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。なかでも好ましくは、ポリエチレンテレフタレート(PET)である。なお、「(メタ)アクリル系樹脂」とは、アクリル系樹脂および/またはメタクリル系樹脂をいう。
D-1.樹脂フィルム
本発明の光学積層体は、上記薄ガラスの偏光板とは反対側に、樹脂フィルムをさらに備えていてもよい。1つの実施形態においては、樹脂フィルムは、剥離可能に(例えば、任意の適切な粘着剤層を介して)積層され、本発明の光学積層体が使用に供されるまで薄ガラスを保護する。
本発明の光学積層体は、反射防止層をさらに備えていてもよい。反射防止層は、薄ガラスの偏光板とは反対側に配置され得る。
上記薄ガラスと偏光板とは、接着層を介して積層され得る。上記接着層を構成する材料としては、例えば、熱硬化性樹脂、活性エネルギー線硬化性樹脂等が挙げられる。このような樹脂の具体例としては、例えば、エポキシ系樹脂;エポキシ基、グリシジル基またはオキセタニル基等を有する環状エーテル類;シリコーン系樹脂;アクリル系樹脂およびこれらの混合物が挙げられる。なかでも好ましくは、エポキシ系樹脂を含む接着層が形成され得る。エポキシ系樹脂を含む接着層が形成されば、薄ガラスが破損し難く、耐衝撃性により優れる光学積層体を得ることができる。また、上記接着層に上記カップリング剤を添加してもよい。
本発明の光学積層体の製造方法としては、任意の適切な方法が採用され得る。該製造方法は、例えば、(1)薄ガラス一方の面において、接着剤組成物を介して薄ガラスと偏光板とを貼り合わせる貼着工程と、(2)接着剤組成物を硬化させて、接着層を形成する硬化工程とを含む。
20 偏光板
100 光学積層体
Claims (5)
- 厚みが100μm以下の薄ガラスと、該薄ガラスの一方の側に配置される偏光板とを備え、
該偏光板が、偏光子と、該偏光子の該薄ガラス側の面に配置される保護フィルムとを含む、
光学積層体。 - 前記薄ガラスと前記偏光板との間に、接着層をさらに備える、請求項1に記載の光学積層体。
- 前記接着層が、エポキシ系樹脂を含む、請求項2に記載の光学積層体。
- 前記保護フィルムの23℃における弾性率が、1.5GPa~10GPaである、請求項1から3のいずれかに記載の光学積層体。
- 反射防止層をさらに備え、該反射防止層が、前記薄ガラスの前記偏光板とは反対側に配置される、請求項1から4のいずれかに記載の光学積層体。
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EP16824479.6A EP3323609B1 (en) | 2015-07-15 | 2016-07-13 | Optical laminate |
CN201680041613.7A CN107848264B (zh) | 2015-07-15 | 2016-07-13 | 显示装置的前面板 |
KR1020187001352A KR102069454B1 (ko) | 2015-07-15 | 2016-07-13 | 광학 적층체 |
US15/743,804 US11198274B2 (en) | 2015-07-15 | 2016-07-13 | Optical laminate having thin glass, polarizer, and protective film with specified modulus of elasticity |
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JP2015141526A JP6615520B2 (ja) | 2015-07-15 | 2015-07-15 | 光学積層体 |
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EP (1) | EP3323609B1 (ja) |
JP (1) | JP6615520B2 (ja) |
KR (1) | KR102069454B1 (ja) |
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CN109765652A (zh) * | 2017-11-10 | 2019-05-17 | 住友化学株式会社 | 复合相位差板、光学层叠体、以及图像显示装置 |
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Also Published As
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EP3323609B1 (en) | 2021-08-18 |
US11198274B2 (en) | 2021-12-14 |
CN107848264A (zh) | 2018-03-27 |
KR102069454B1 (ko) | 2020-01-22 |
JP6615520B2 (ja) | 2019-12-04 |
TWI708074B (zh) | 2020-10-21 |
TW201730593A (zh) | 2017-09-01 |
JP2017024177A (ja) | 2017-02-02 |
EP3323609A4 (en) | 2019-01-23 |
US20180203173A1 (en) | 2018-07-19 |
CN107848264B (zh) | 2021-12-07 |
KR20180018763A (ko) | 2018-02-21 |
EP3323609A1 (en) | 2018-05-23 |
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