WO2022030239A1 - 複層構造体 - Google Patents
複層構造体 Download PDFInfo
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- WO2022030239A1 WO2022030239A1 PCT/JP2021/027003 JP2021027003W WO2022030239A1 WO 2022030239 A1 WO2022030239 A1 WO 2022030239A1 JP 2021027003 W JP2021027003 W JP 2021027003W WO 2022030239 A1 WO2022030239 A1 WO 2022030239A1
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- 229920005989 resin Polymers 0.000 claims abstract description 97
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- 229910052783 alkali metal Inorganic materials 0.000 description 1
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- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B32B17/10009—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 number, the constitution or treatment of glass sheets
- B32B17/10018—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 number, the constitution or treatment of glass sheets comprising only one glass sheet
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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
- 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
- B32B17/10807—Making laminated safety glass or glazing; Apparatus therefor
- B32B17/10816—Making laminated safety glass or glazing; Apparatus therefor by pressing
- B32B17/10825—Isostatic pressing, i.e. using non rigid pressure-exerting members against rigid parts
- B32B17/10862—Isostatic pressing, i.e. using non rigid pressure-exerting members against rigid parts using pressing-rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
- C03C17/3405—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of organic materials
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/51—Elastic
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
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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
- B32B2307/546—Flexural strength; Flexion stiffness
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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
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/737—Dimensions, e.g. volume or area
- B32B2307/7375—Linear, e.g. length, distance or width
- B32B2307/7376—Thickness
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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
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
Definitions
- the present invention relates to a multi-layer structure.
- the film-like members used in these devices are continuously produced by a roll-to-roll process.
- the use of thin glass has been proposed as a flexible material that can be processed or processed by a roll-to-roll process. Since thin glass is very brittle and inferior in handleability, for example, a flexible substrate has been proposed in which a resin film is attached to the glass surface to reinforce it and improve handleability.
- the present invention has been made in view of the above points, and an object of the present invention is to provide a multi-layer structure in which the glass layer does not break even when bent at a desired radius of curvature.
- the present multi-layer structure is a multi-layer structure having one or more resin layers and a glass layer laminated on the resin layer via a bonding layer, and the multi-layer structure is described as described above.
- the ratio t / ⁇ 0 of the radius of curvature ⁇ 0 to the thickness t of the glass layer is ⁇ 0 when the radius of curvature at the limit at which the glass layer does not break when the glass layer is bent so as to be inward is ⁇ 0. , 0.001 or more and 0.02 or less.
- FIG. 1 is a cross-sectional view illustrating the multilayer structure according to the first embodiment.
- the multilayer structure 10 has a glass layer 11, a bonding layer 12, a resin layer 13, a bonding layer 14, and a resin layer 15.
- the resin layer 13 is laminated on one surface of the glass layer 11 via the bonding layer 12, and the resin layer 15 is laminated on the other surface of the glass layer 11 via the bonding layer 14. ..
- the planar shape of the multi-layer structure 10 (the shape seen from the normal direction of one surface of the glass layer 11) can be a rectangular shape, a circular shape, an elliptical shape, a composite of these, or any other appropriate shape. Is. Since the multi-layer structure 10 has flexibility, it can be easily attached to a curved surface.
- the glass layer 11 is not particularly limited, and an appropriate glass layer 11 can be adopted depending on the intended purpose.
- the glass layer 11 includes, for example, soda-lime glass, borosilicate glass, aluminosilicate glass, quartz glass and the like.
- non-alkali glass and low-alkali glass can be mentioned.
- the content of the alkali metal component (for example, Na 2 O, K 2 O, Li 2 O) of the glass is preferably 15% by weight or less, and more preferably 10% by weight or less.
- the thickness of the glass layer 11 is, for example, 10 ⁇ m or more and 200 ⁇ m or less.
- the glass layer having a thickness of 10 ⁇ m to 200 ⁇ m means a glass layer having an average thickness of 10 ⁇ m to 200 ⁇ m.
- the thickness of the glass layer 11 is preferably 10 ⁇ m or more in consideration of the surface hardness, airtightness, and corrosion resistance of the glass. Further, since it is desirable that the single glass layer 11 has flexibility like a film in order to obtain a curved structure, the thickness of the glass layer 11 is preferably 200 ⁇ m or less. Particularly preferably, it is 50 ⁇ m or more and 100 ⁇ m or less.
- the elastic modulus of the glass layer 11 is, for example, 60 MPa or more and 80 MPa or less.
- the elastic modulus of the glass layer 11 is preferably 60 MPa or more, more preferably 65 MPa or more, from the viewpoint of rigidity.
- the elastic modulus of the glass layer 11 is preferably 80 MPa or less, more preferably 75 MPa or less, from the viewpoint of flexibility.
- the light transmittance of the glass layer 11 at a wavelength of 550 nm is preferably 85% or more.
- the refractive index of the glass layer 11 at a wavelength of 550 nm is preferably 1.4 to 1.65.
- the density of the glass layer 11 is preferably 2.3 g / cm 3 to 3.0 g / cm 3 , and more preferably 2.3 g / cm 3 to 2.7 g / cm 3 .
- the molding method of the glass layer 11 is not particularly limited, and an appropriate one can be adopted according to the purpose.
- the glass layer 11 is a mixture containing a main raw material such as silica and alumina, a defoaming agent such as sardine and 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, forming into a thin plate, and then cooling.
- Examples of the method for forming the glass layer 11 include a slot down draw method, a fusion method, and a float method.
- 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 make the plate thinner or to improve the smoothness.
- the resin layers 13 and 15 are layers that reinforce the glass layer 11 and have flexibility.
- the resin layers 13 and 15 are composed of one or a plurality of layers.
- the thickness of each of the resin layers 13 and 15 may be 10 ⁇ m or more and 200 ⁇ m or less, preferably 20 ⁇ m or more and 100 ⁇ m or less, and more preferably 20 ⁇ m or more and 50 ⁇ m or less, from the viewpoint of reinforcement.
- the elastic modulus of the resin layers 13 and 15 is, for example, 1 MPa or more and 10 MPa or less.
- the elastic modulus of the resin layers 13 and 15 is preferably 1 MPa or more, more preferably 3 MPa or more, from the viewpoint of rigidity.
- the elastic modulus of the resin layers 13 and 15 is preferably 10 MPa or less, more preferably 7 MPa or less, from the viewpoint of flexibility.
- Examples of the materials of the resin layers 13 and 15 include polyester resins such as polyethylene terephthalate resin and polyethylene naphthalate resin, cycloolefin resins such as norbornene resin, polyether sulfone resins, polycarbonate resins, and acrylics. Examples thereof include based resins, polyolefin resins, polyimide resins, polyamide resins, polyimideamide resins, polyarylate resins, polysulfone resins, polyetherimide resins, urethane resins and the like.
- the materials of the resin layer 13 and the resin layer 15 may be the same or different. Further, the resin layer 13 and the resin layer 15 may each be composed of a plurality of layers. For example, a resin having an optical function of a polarizing plate or a retardation plate may be used as the resin layer as a matter of course.
- any suitable adhesive or pressure-sensitive adhesive is used as the bonding layers 12 and 14.
- the adhesive material include an ultraviolet curable acrylic adhesive, an ultraviolet curable epoxy adhesive, a thermosetting epoxy adhesive, a thermosetting melamine adhesive, a thermosetting phenol adhesive, and ethylene.
- examples thereof include vinyl acetate (EVA) interlayer film and polyvinyl butyral (PVB) interlayer film.
- Examples of the material of the pressure-sensitive adhesive include an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive.
- the thicknesses of the bonding layers 12 and 14 are not particularly limited, but are, for example, 0.1 ⁇ m or more and 500 ⁇ m or less, preferably 0.1 ⁇ m or more and 50 ⁇ m, and more preferably 0.1 ⁇ m or more and 5 ⁇ m or less. .. Within this range, the reinforcing effect of the resin layer can be appropriately designed.
- the adhesive means a layer that has adhesiveness at room temperature and adheres to an adherend with a light pressure. Therefore, even when the adherend attached to the adhesive is peeled off, the adhesive retains a practical adhesive force.
- the adhesive refers to a layer that can bind substances by interposing between the substances. Therefore, when the adherend attached to the adhesive is peeled off, the adhesive does not have a practical adhesive force.
- a glass layer 11 formed into a predetermined shape by an overflow method, a float method, a down draw method, press working, or the like, and resin layers 13 and 15 are provided via bonding layers 12 and 14. Obtained by laminating.
- the glass layer 11 and the resin layers 13 and 15 are continuously laminated via the bonding layers 12 and 14 using a roll-to-roll process, and then individualized into arbitrary sizes by press processing, laser processing, or the like. You may.
- Ultra-thin glass such as glass layer 11 has the original dimensional stability, barrier property, and surface hardness of glass, and also has flexibility. However, since the ultrathin glass has a big problem in handleability due to its fragility, it is difficult to handle the glass layer 11 alone.
- the resin layers 13 and 15 are laminated to reinforce the ultra-thin glass layer 11, not only the handling property of the ultra-thin glass layer 11 can be improved, but also the ultra-thin glass layer 11 can be handled. It is easy to flow the glass layer 11 of the above in a roll-to-roll process. Further, if the resin layer 13 and / or 15 has an optical function, it is possible to create a new application.
- the multi-layer structure 10 is excellent in handleability by laminating the resin layers 13 and 15 on the glass layer 11, and in particular, the strength against bending is greatly improved with respect to the glass layer 11 alone. The results of the study by the inventors regarding this will be described below.
- Breakage of the glass layer occurs due to tearing stress in minute cracks. Fracture due to tear stress is dominated by bending of the glass layer. Therefore, when a minute crack is generated in the glass layer, the glass layer is easily broken due to its flexibility. Therefore, the inventors simulated the deformation of the glass layer due to bending, and in order to verify the effect of reinforcement by laminating the resin layer, when the glass layer was provided with minute cracks, the glass layer was formed by the resin layer. It was tested whether the growth of cracks in the glass could be suppressed.
- the glass layer 11 is a 50 mm ⁇ 110 mm glass film (manufactured by Nippon Electric Glass Co., Ltd., OA10G, thickness 50 ⁇ m)
- the resin layers 13 and 15 are resin films (manufactured by Mitsubishi Chemical Co., Ltd.), and the bonding layers 12 and 14.
- An ultraviolet cross-linking resin manufactured by Daicel Chemical Industry Co., Ltd.
- a pressure-sensitive adhesive manufactured by Nitto Denko Co., Ltd.
- FIG. 2 shows a cross-sectional view of the multi-layer structures 10A and 10B
- FIG. 3 shows a plan view of the multi-layer structures 10A and 10B.
- the cross-sectional structures of the multi-layer structures 10A and 10B which are test samples, are the same as those in FIG.
- both ends of the glass layer 11 in the longitudinal direction are projected from the resin layers 13 and 15, and cracks 300 are formed in the protruding portions on one side of the glass layer 11.
- 400 is a test jig that sandwiches both ends of the multi-layer structures 10A and 10B in the longitudinal direction, and bends the multi-layer structures 10A and 10B in the direction of the arrow in FIG. 2 by reducing the distance between the opposing 400s. be able to.
- FIG. 4 schematically shows the state of the two-point bending test.
- the distance D at which the glass layer 11 breaks was measured by adjusting the spacing between the test jigs 400 and changing the degree of bending of the multi-layer structures 10A and 10B.
- breaking the glass layer 11 means that the glass layer 11 breaks and is divided into two or more portions. That is, the state in which the glass layer 11 is merely cracked as shown in FIG. 3 is not the state in which the glass layer 11 is broken. In FIG. 3, when the crack 300 on one side reaches the other side and penetrates, and the glass layer 11 breaks and is divided into two or more portions, it is broken.
- the breaking stress ⁇ of the glass layer 11 (the stress at which the glass layer 11 breaks when the double glazing structure 10 is bent) was calculated from the measured distance D using the following formula (1).
- t is the thickness of the glass layer 11
- E is the elastic coefficient of the glass layer 11
- ⁇ is the normal of the upper surface of the glass layer 11 before bending and the tangent to the end of the glass layer 11 at a distance D. It is the angle between the two.
- FIG. 5 shows the result of the fracture stress ⁇ obtained by calculation.
- "11 only” is the data for comparison, and is the data in the state of only the glass layer 11 on which the resin layer is not laminated.
- FIG. 5 it was found that when the glass layer 11 is cracked, the glass layer 11 is destroyed at about 20 MPa in the state of only the glass layer 11, whereas the destruction is suppressed by laminating the resin layers 13 and 15. rice field.
- the breaking stress ⁇ is about twice as much as in the case of only the glass layer 11, and in the multi-layer structure 10A using the ultraviolet crosslink type resin, it is about 10 times. It has become. That is, although a certain effect can be obtained even if an adhesive is used as the bonding layers 12 and 14, the fracture stress ⁇ can be significantly improved by using the adhesive as the bonding layers 12 and 14.
- the preferred radius of curvature of the multi-layer structure 10 when the adhesive is used as the bonding layers 12 and 14 is 50 to 300 mm, and the bonding layer is formed.
- the preferred radius of curvature of the multi-layer structure 10 when the adhesive is used as 12 and 14 is 2 to 150 mm.
- (1) is a polyethylene terephthalate resin having an elastic modulus of 4.8 GPa
- (2) is a cycloolefin resin having an elastic modulus of 2.1 GPa
- (3) is a polyethylene resin having an elastic modulus of 0.3 GPa.
- the radius of curvature is ⁇ 0 .
- the ratio t / ⁇ 0 to the thickness t of the glass layer 11 is 0.001 or more and 0.02 or less, it is possible to realize a multi-layer structure 10 in which the glass layer 11 is not destroyed even if it is bent with a radius of curvature ⁇ 0 .
- the cracks can be propagated and the number of cracks can be increased. Can be suppressed.
- the value of 0.001 can be derived from the result of the bending test of the glass layer 11 alone on which the resin layers 13 and 15 are not laminated, and the value of 0.02 is the resin layers 13 and 15 having a sufficient thickness on the glass layer 11. It can be derived from the result of the bending test of the multi-layer structure 10 in the case of being laminated.
- the range of the thickness t of the glass layer 11 is determined. Therefore, if the thickness t of the glass layer 11 is designed to be within that range, the radius of curvature ⁇ 0 is determined. It is possible to realize a multi-layer structure 10 in which the glass layer 11 is not destroyed even if it is bent by the above.
- the multi-layer structure 10 when the multi-layer structure 10 is conveyed by using the roll-to-roll process, the multi-layer structure 10 bends at the roll portion.
- the thickness t of the glass layer 11 is designed so as not to break at the radius of curvature, so that the multi-layer structure can be used by using the roll-to-roll process. It is possible to suppress the destruction of the glass layer 11 when the 10 is conveyed.
- bending so that the glass layer 11 is on the inside means bending so that the resin layer exists on the outside of the glass layer 11.
- the resin layer existing outside the glass layer 11 may be the resin layer 13 or the resin layer 15. That is, when the resin layers are laminated on both sides of the glass layer 11, any resin layer may be bent so as to be on the outside.
- the inventors consider the mechanism by which the glass layer can be reinforced by laminating the resin layer even though the elastic modulus of the resin layer is as small as about 1/10 of that of the glass layer, based on the Griffith theory. I tried. Griffith theory states that fracture of the glass layer occurs when the energy state when fracture occurs is lower than the energy state when fracture does not occur.
- the elastic energy ⁇ when the radius of curvature ⁇ is set in the elastic deformation region is expressed by the equation (2).
- E indicates the elastic modulus and ⁇ indicates the variable in the thickness direction.
- Eg, Ep, Tg, and Tp are determined so as to satisfy the equation (5) when the radius of curvature ⁇ 0 , which is the limit at which the glass layer 11 does not break, is set to a desired value, bending is performed at the radius of curvature ⁇ 0 . It is possible to realize a multi-layer structure 10 in which the glass layer 11 is not destroyed even if the glass layer 11 is made to do so.
- Eg is the elastic modulus of the glass layer
- Ep is the elastic modulus of the resin layer
- tg is the thickness of the glass layer
- tp is the thickness of the resin layer
- FIG. 10 is a cross-sectional view illustrating the multilayer structure according to the modified example of the first embodiment.
- the multi-layer structure according to the present invention may have one or more resin layers. That is, the above contents also apply to the case where the resin layer 13 is laminated on one side of the glass layer 11 as in the multi-layer structure 10C shown in FIG. However, when the resin layer 13 is laminated on one side of the glass layer 11, the above contents apply only when the multilayer structure 10C is bent in the direction of the arrow in FIG. 10 so that the glass layer 11 is on the inside. ..
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Abstract
Description
図1は、第1実施形態に係る複層構造体を例示する断面図である。図1に示すように、複層構造体10は、ガラス層11と、接合層12と、樹脂層13と、接合層14と、樹脂層15とを有している。複層構造体10において、ガラス層11の一方の面に接合層12を介して樹脂層13が積層され、ガラス層11の他方の面に接合層14を介して樹脂層15が積層されている。
ガラス層11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11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。
樹脂層13及び15は、ガラス層11を補強する層であり、可撓性を有する。樹脂層13及び15は、一つ又は複数の層から構成されている。樹脂層13及び15が複数層からなる場合には、接着機能を有する密着層を介在させ積層させることが好ましい。樹脂層13及び15の各々の厚みは、補強の観点から10μm以上200μm以下であればよく、好ましくは20μm以上100μm以下、より好ましくは20μm以上50μm以下である。
接合層12及び14としては、任意の適切な接着剤又は粘着剤が用いられる。接着剤の材料としては、例えば、紫外線硬化性アクリル系接着剤、紫外線硬化性エポキシ系接着剤、熱硬化性エポキシ系接着剤、熱硬化性メラミン系接着剤、熱硬化性フェノール系接着剤、エチレンビニルアセテート(EVA)中間膜、ポリビニルブチラール(PVB)中間膜等が挙げられる。又、粘着剤の材料としては、例えば、アクリル系粘着剤、シリコーン系粘着剤、ゴム系粘着剤等が挙げられる。接合層12及び14の厚みは、特に限定するものではないが、例えば、0.1μm以上500μm以下程度であり、好ましくは0.1μm以上50μmであり、より好ましくは0.1μm以上5μm以下である。この範囲内であれば樹脂層の補強効果を適切に設計できる。
複層構造体10は、例えば、オーバーフロー法、フロート法、ダウンドロー法やプレス加工等により所定の形状に形成したガラス層11と、樹脂層13及び15とを、接合層12及び14を介して積層させることで得られる。或いは、ガラス層11と樹脂層13及び15とを接合層12及び14を介してロールトゥロールプロセスを利用して連続的に積層後、プレス加工やレーザ加工等により、任意のサイズに個片化してもよい。
ガラス層11のような超極薄ガラスは、ガラスの持つ本来の寸法安定性、バリア性、表面硬度を有し、かつフレキシブル性も有している。しかし、超極薄ガラスは、脆弱性が故にハンドリング性に大きな課題を有するため、ガラス層11単体での取り扱いは困難である。
式(4)において、ρm=kρ(0<k<1)としてkの値を1よりも小さくして行った結果、図7の(式4のカーブ)に示すようにΔUがゼロとなる値が測定値であるρ=12mmに近づいた。なお、図7の(式4のカーブ)は、Eg=73GPa、Ep=2.1GPa、tg=50μm、tp=23μm、k=0.47とした場合のものである。
図10は、第1実施形態の変形例に係る複層構造体を例示する断面図である。以上では、ガラス層の両側に樹脂層を積層する例について説明したが、本発明に係る複層構造体は1層以上の樹脂層を有していればよい。つまり、図10に示す複層構造体10Cのように、ガラス層11の片側に樹脂層13を積層する場合にも上記の内容は当てはまる。但し、ガラス層11の片側に樹脂層13を積層する場合には、複層構造体10Cをガラス層11が内側になるように図10の矢印方向に曲げたときのみに、上記の内容が当てはまる。
11 ガラス層
12、14 接合層
13、15 樹脂層
Claims (6)
- 1層以上の樹脂層と、
前記樹脂層上に接合層を介して積層されたガラス層と、を有する複層構造体であって、
前記複層構造体を、前記ガラス層が内側になるように曲げたときに、前記ガラス層が破壊しない限界の曲率半径をρ0としたときに、
曲率半径ρ0と前記ガラス層の厚みtとの比t/ρ0は、0.001以上0.02以下である、複層構造体。 - 前記ガラス層の厚みtは、10μm以上200μm以下であり、
前記ガラス層の弾性率は、60MPa以上80MPa以下である、請求項1又は2に記載の複層構造体。 - 前記樹脂層の厚みは、10μm以上200μm以下であり、
前記樹脂層の弾性率は、1MPa以上10MPa以下である、請求項1乃至3の何れか一項に記載の複層構造体。 - 前記接合層は、接着剤である、請求項1乃至4の何れか一項に記載の複層構造体。
- 前記ガラス層の厚みtは、30μm以上100μm以下である、請求項1乃至5の何れか一項に記載の複層構造体。
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