WO2022102470A1 - 複層構造体及びその製造方法 - Google Patents
複層構造体及びその製造方法 Download PDFInfo
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- WO2022102470A1 WO2022102470A1 PCT/JP2021/040381 JP2021040381W WO2022102470A1 WO 2022102470 A1 WO2022102470 A1 WO 2022102470A1 JP 2021040381 W JP2021040381 W JP 2021040381W WO 2022102470 A1 WO2022102470 A1 WO 2022102470A1
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- 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
- B32B2315/00—Other materials containing non-metallic inorganic compounds not provided for in groups B32B2311/00 - B32B2313/04
- B32B2315/08—Glass
-
- 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
- B32B2551/00—Optical elements
Definitions
- the present invention relates to a multi-layer structure and a method for manufacturing the same.
- a multi-layer structure in which two or more layers are laminated is known.
- One example is a multi-layer structure in which a silver reflective layer is laminated on a thin glass layer (glass film).
- the thickness of this multi-layer structure is, for example, in the range of 1.0 to 200 ⁇ m.
- This multi-layer structure is obtained, for example, from a glass roll formed by a downdraw method.
- the thin glass layer as described above is very brittle, cracks are likely to occur and the handleability is poor. Therefore, for example, a resin layer is attached to one side of the glass layer to reinforce it and improve the handleability.
- a multi-layer structure has been proposed.
- 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 cracks are less likely to occur in the glass layer.
- the multi-layer structure has a resin layer and a glass layer laminated on the resin layer via an adhesive layer, and the thickness of the glass layer is 10 ⁇ m or more and 300 ⁇ m or less, and the resin layer is formed.
- the outer peripheral portion of the above has a thickness of 5 ⁇ m or more.
- FIG. 1 is a cross-sectional view illustrating the multilayer structure according to the first embodiment.
- FIG. 2 is a bottom view illustrating the multilayer structure according to the first embodiment, and is a view of the multilayer structure viewed from the lower surface side of the resin layer.
- the multilayer structure 1 has a resin layer 10, an adhesive layer 20, and a glass layer 30.
- the resin layer 10 has an upper surface 10a, a lower surface 10b, and a side surface 10c.
- the glass layer 30 has an upper surface 30a, a lower surface 30b, and a side surface 30c.
- the glass layer 30 is laminated on the upper surface 10a of the resin layer 10 via the adhesive layer 20. That is, the adhesive layer 20 adheres the upper surface 10a of the resin layer 10 and the lower surface 30b of the glass layer 30.
- Planar shape of the multi-layer structure 1 (The shape of the upper surface 30a of the glass layer 30 when viewed from the normal direction is, for example, a rectangular shape. However, the plan shape of the multi-layer structure 1 is not limited to this. , Circular shape, elliptical shape, composite of these, and other appropriate shapes. Since the multi-layer structure 1 has flexibility, it can be easily attached to a curved surface.
- the planar shape of the multi-layer structure 1 is rectangular.
- the planar shape of the resin layer 10 is rectangular, and the planar shape of the glass layer 30 is also rectangular.
- the cross-sectional shape of the glass layer 30 is rectangular.
- the resin layer 10 has an outer peripheral portion 101, an inner portion 102, and an inclined portion 103.
- the outer peripheral portion 101 is a portion facing the outer edge of the resin layer 10, and the width of the outer peripheral portion 101 is, for example, about 20 ⁇ m to 150 ⁇ m.
- the outer peripheral portion 101 has a thickness of 5 ⁇ m or more. By setting the thickness of the outer peripheral portion 101 to 5 ⁇ m or more, it is possible to prevent the influence of heat generated by the laser beam on the glass layer 30 when the resin layer 10 is processed by irradiating the resin layer 10 with the laser beam. As a result, it is possible to prevent the glass layer 30 from being cracked when the glass layer 30 is cut by the laser beam. Further, the thickness of the outer peripheral portion 101 is preferably 105 ⁇ m or less. As a result, the splitting property of the resin layer 10 and the glass layer 30 by the laser is improved. The manufacturing process of the multi-layer structure 1 will be described later.
- the inner portion 102 is provided on the center side of the resin layer 10 from the outer peripheral portion 101.
- the inner portion 102 has the same thickness as the outer peripheral portion 101, or is thicker than the outer peripheral portion 101.
- the total thickness of the resin layer 10 is substantially constant at 5 ⁇ m or more.
- the resin layer 10 When the inner portion 102 is thicker than the outer peripheral portion 101, the resin layer 10 has an inclined portion 103 between the inner portion 102 and the outer peripheral portion 101 whose thickness gradually increases from the outer peripheral portion 101 toward the inner peripheral portion 102. May be good.
- the side surface of the inclined portion 103 is an inclined surface having an angle formed by the lower surface 10b of the resin layer 10 larger than 90 degrees.
- the inclined portion 103 and the outer peripheral portion 101 are provided in an annular shape around, for example, the inner portion 102.
- the inclined portion 103 may be formed on only one side of the resin layer 10 or the inclined portion 103 may be formed on two or three sides of the resin layer 10 in the bottom view. In some cases. Further, although the thickness of the outer peripheral portion 101 is 5 ⁇ m or more, it does not have to be a constant thickness. For example, in the bottom view, the thickness of the outer peripheral portion 101 may be 5 ⁇ m in the portion facing one side of the resin layer 10, and the outer peripheral portion 101 may be thicker than 5 ⁇ m in the portion facing the other three sides. Alternatively, in the bottom view, the thickness of the outer peripheral portion 101 is 5 ⁇ m in the portion facing the two or three sides of the resin layer 10, and the outer peripheral portion 101 is thicker than 5 ⁇ m in the portion facing the other two or one side. good.
- FIG. 3 is a partially enlarged cross-sectional view of the vicinity of the outer peripheral portion of the multi-layer structure according to the first embodiment.
- the end portion of the outer peripheral portion 101 projects horizontally from the side surface 30c of the glass layer 30.
- the amount P1 of the end portion of the outer peripheral portion 101 protruding from the side surface 30c of the glass layer 30 is preferably larger than 0 ⁇ m and 10 ⁇ m or less.
- the protrusion amount P1 may be 0 ⁇ m. That is, in a plan view, the outer edge of the outer peripheral portion 101 and the outer edge of the glass layer 30 may coincide with each other.
- the resin layer 10 is a layer that serves as a base material for laminating the glass layer 30 and the like, and has flexibility.
- the resin layer 10 is composed of one layer or a plurality of layers.
- the resin layer 10 is composed of a plurality of layers, it is preferable to interpose and laminate an adhesive layer having an adhesive function.
- the total thickness of the resin layer 10 may be 20 ⁇ m or more and 1000 ⁇ m or less, preferably 25 ⁇ m or more and 500 ⁇ m or less, and more preferably 50 ⁇ m or more and 200 ⁇ m or less.
- the thickness of the resin layer 10 can be, for example, in the range of 30 ⁇ m or more and 50 ⁇ m or less.
- polyester resins such as polyethylene terephthalate resin and polyethylene naphthalate resin
- cycloolefin resins such as norbornene resin
- polyether sulfone resins polycarbonate resins
- acrylic resins acrylic resins.
- Polyolefin-based resin polyimide-based resin, polyamide-based resin, polyimideamide-based resin, polyarylate-based resin, polysulfone-based resin, polyetherimide-based resin, cellulose-based resin, urethane-based resin and the like.
- the adhesive layer 20 any suitable adhesive is used.
- the thickness of the adhesive layer 20 is, for example, 0.5 ⁇ m or more and 25 ⁇ m or less.
- the adhesive layer 20 includes, for example, an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, an ultraviolet-curable acrylic adhesive, an ultraviolet-curable epoxy-based adhesive, a heat-curable epoxy-based adhesive, and heat-curing.
- sexual melamine-based adhesives, thermosetting phenol-based adhesives, ethylene vinyl acetate (EVA) interlayer films, polyvinyl butyral (PVB) interlayer films and the like can be used.
- 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.
- the glass layer 30 is not particularly limited, and an appropriate glass layer 30 can be adopted depending on the intended purpose.
- the glass layer 30 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 30 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 glass layer 30 has flexibility like a film, the thickness of the glass layer 30 is preferably 300 ⁇ m or less. The thickness of the glass layer 30 is more preferably 30 ⁇ m or more and 200 ⁇ m or less, and particularly preferably 50 ⁇ m or more and 100 ⁇ m or less.
- the light transmittance of the glass layer 30 at a wavelength of 550 nm is preferably 85% or more.
- the refractive index of the glass layer 30 at a wavelength of 550 nm is preferably 1.4 to 1.65.
- the density of the glass layer 30 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 30 is not particularly limited, and an appropriate one can be adopted according to the purpose.
- the glass layer 30 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 30 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 glass thin and to improve the 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 surface of the glass layer 30.
- FIGS. 4 to 9 are diagrams illustrating the manufacturing process of the multi-layer structure according to the first embodiment.
- the manufacturing process of the multi-layer structure will be described with particular focus on the cutting process using a laser.
- a sheet-shaped multi-layer structure 1S in which a resin layer 10 and a glass layer 30 are laminated via an adhesive layer 20 is prepared.
- the thickness of the glass layer 30 is 10 ⁇ m or more and 300 ⁇ m or less.
- the thickness of the resin layer 10 is 5 ⁇ m or more.
- the multi-layer structure 1S is obtained by laminating a resin layer 10 and a glass layer 30 formed in a predetermined shape by press working or the like via an adhesive layer 20.
- the resin layer 10 and the glass layer 30 may be continuously laminated via the adhesive layer 20 by a roll-to-roll process, and then individualized into arbitrary sizes by press working or the like. Further, the already completed multi-layer structure 1S may be procured.
- a plurality of product areas A that become the multi-layer structure 1 by being delimited are defined.
- the product areas A are arranged vertically and horizontally at predetermined intervals, but the present invention is not limited to this.
- the product area A may be arranged one-dimensionally.
- 4 is a plan view
- FIG. 5 is a partially enlarged cross-sectional view showing the vicinity of one product area A.
- each product region A of the multilayer structure 1S is irradiated with the laser beam L1 from the lower surface 10b side of the resin layer 10.
- the outer peripheral portion of each product region A shown in FIG. 4 is sequentially irradiated with the laser beam L1 in a grid pattern.
- the laser beam L1 is set to, for example, irradiation conditions that do not penetrate the resin layer 10.
- grooves 10x having a substantially trapezoidal cross-sectional shape are formed in the resin layer 10 in a grid pattern on the outer peripheral portion of each product region A shown in FIG.
- the width of the widest portion of the groove 10x (the width on the lower surface 10b side of the resin layer 10) is, for example, about 40 ⁇ m to 300 ⁇ m.
- the residual resin layer 105 is formed in a grid pattern on the outer peripheral portion of each product region A shown in FIG.
- the irradiation conditions of the laser beam L1 are adjusted so that the thickness T1 of the residual resin layer 105 is 5 ⁇ m or more.
- a carbon dioxide laser can be used for irradiating the laser beam L1.
- a femtosecond laser may be used to irradiate the laser beam L1, but if color loss of the resin layer 10 due to the influence of heat becomes a problem, a carbon dioxide gas laser that does not easily cause color loss of the resin layer 10 is used. It is preferable to do so.
- the steps shown in FIGS. 6 and 7 may be carried out as necessary. That is, if the thickness of the resin layer 10 is 105 ⁇ m or less, the splitting property is good. Therefore, even if the groove 10x is not provided, the glass layer 30 and the resin layer 10 are subjected to the laser beam L2 in the steps shown in FIGS. 8 and 9. Can be disconnected.
- the thickness of the resin layer 10 is larger than 105 ⁇ m, it is preferable to form the groove 10x so that the thickness T1 of the residual resin layer 105 is 5 ⁇ m or more. As a result, in the steps shown in FIGS. 8 and 9, the partitionability of the resin layer 10 by the laser beam L2 becomes good.
- each product region A of the multilayer structure 1S is irradiated with the laser beam L2 from the upper surface 30a side of the glass layer 30.
- the outer peripheral portion of each product region A shown in FIG. 4 is irradiated with the laser beam L2 in dots at predetermined intervals along the grid.
- the laser beam L2 is irradiated until the glass layer 30 and the residual resin layer 105 are cut and each product region A is fragmented.
- a femtosecond laser or a carbon dioxide laser can be used for irradiating the laser beam L2.
- the portion where the residual resin layer 105 is cut is the outer peripheral portion 101 shown in FIG. 1 and the like.
- the diameter of one dot is about 0.5 ⁇ m to 2 ⁇ m, and the distance between adjacent dots is about 0 ⁇ m to 2 ⁇ m. That is, adjacent dots may overlap and the intervals may not be separated.
- the diameter and spacing of the dots are 10 times or more that when a femtosecond laser is used. Considering the processability of the glass layer 30, it is preferable to use a femtosecond laser in this step.
- the end portion of the outer peripheral portion 101 expands due to the heat generated by the irradiation of the laser beam L2. However, it may protrude in the horizontal direction from the side surface 30c of the glass layer 30.
- the amount of protrusion of the end portion of the outer peripheral portion 101 from the side surface 30c of the glass layer 30 is about 3 ⁇ m or more and less than 5 ⁇ m.
- the amount of protrusion of the end portion of the outer peripheral portion 101 from the side surface 30c of the glass layer 30 is larger than 0 ⁇ m and about 10 ⁇ m or less.
- FIG. 10 is a diagram illustrating the manufacturing process of the multi-layer structure according to the comparative example. As shown in FIG. 10, when irradiating the resin layer 10 with the laser beam L1 from the lower surface 10b side of the resin layer 10, it is assumed that the irradiation conditions are set so as to penetrate the resin layer 10 without providing the residual resin layer.
- a molten layer 35 having a predetermined thickness is formed in the thickness direction of the glass layer 30 from the lower surface 30b exposed in the through hole 10y of the glass layer 30.
- a molten layer 35 having a substantially semicircular cross-sectional shape is formed in a grid pattern on the outer peripheral portion of each product region A shown in FIG.
- the molten layer 35 is a layer formed by heat damage caused by irradiation of laser light from the resin layer 10 side, and residual stress is generated. Therefore, when the thick portion of the molten layer 35 is cut, cracks are likely to occur in the cut portion.
- the thickness of the residual resin layer 105 is set so that the molten layer 35 is not formed. If the thickness of the residual resin layer 105 is 5 ⁇ m or more, the molten layer 35 is not formed.
- the outer peripheral portion 101 of the resin layer 10 has a thickness of 5 ⁇ m or more. Since the outer peripheral portion 101 is formed by being cut by a laser beam, the thickness of the outer peripheral portion 101 is set to 5 ⁇ m or more so that the heat generated by the laser beam when the resin layer 10 is processed by irradiating the laser beam. It is possible to prevent the influence from reaching the glass layer 30. As a result, it is possible to prevent the glass layer 30 from being cracked when the glass layer 30 is cut by the laser beam.
- processing marks remain on the processed side surface (cut surface) of the glass layer 30.
- the machined marks are linear grooves whose longitudinal direction is the laser irradiation direction.
- the pitch of the adjacent grooves varies depending on the conditions, but is about 1 ⁇ m.
- the cross section in the lateral direction of the groove is approximately semicircular, and the height of the processing mark (depth of the groove) is about 0.1 ⁇ m on average.
- Modification 1 of the first embodiment shows an example of a multi-layer structure in which the resin layer is composed of a plurality of layers.
- the description of the same component as that of the above-described embodiment may be omitted.
- FIG. 11 is a cross-sectional view illustrating the multilayer structure according to the first modification of the first embodiment.
- the multi-layer structure 1A differs from the multi-layer structure 1 (see FIG. 1 and the like) in that the resin layer 10 is composed of a plurality of layers.
- the resin layer 10 has an outer peripheral portion 101, an inner portion 102, and an inclined portion 103, as in the first embodiment.
- the outer peripheral portion 101 of the resin layer 10 has a thickness of 5 ⁇ m or more.
- the outer peripheral portion 101, the inner portion 102, and the inclined portion 103 are composed of one or more layers, and may be composed of two or more layers.
- the outer peripheral portion 101 is composed of two layers, but may be composed of one layer or three or more layers.
- the resin layer 10 includes a polarizing plate 12, an adhesive layer 18, and a release film 19 in this order from the adhesive layer 20 side.
- the resin layer 10 may further include another layer.
- the resin layer 10 can be provided with a retardation layer between the polarizing plate 12 and the pressure-sensitive adhesive layer 18, but the resin layer 10 is not limited thereto.
- the elastic modulus of the resin layer 10 is preferably 0.1 GPa to 8.0 GPa, more preferably 0.2 GPa to 7.0 GPa, and further preferably 0.3 GPa to 5.0 GPa.
- the elastic modulus can be measured under the following conditions using an autograph.
- the polarizing plate 12 is arranged on the adhesive layer 20 side.
- the polarizing plate 12 has a polarizing element 121, a first protective film 122, and a second protective film 123.
- the first protective film 122 is arranged on the adhesive layer 20 side of the polarizing element 121
- the second protective film 123 is arranged on the adhesive layer 18 side of the polarizing element 121.
- the release film 19 is arranged on the opposite side of the second protective film 123 from the polarizing element 121 via the pressure-sensitive adhesive layer 18.
- the thickness of the polarizing plate 12 is preferably 5 ⁇ m to 300 ⁇ m, more preferably 10 ⁇ m to 250 ⁇ m, still more preferably 25 ⁇ m to 200 ⁇ m, and particularly preferably 25 ⁇ m to 100 ⁇ m.
- the elastic modulus of the polarizing plate 12 is preferably 1 GPa or more, more preferably 1 GPa to 10 GPa, further preferably 2 GPa to 7 GPa, and particularly preferably 2 GPa to 5 GPa. Within such a range, a multi-layer structure 1A having excellent puncture resistance can be obtained.
- the shape of the polarizing plate 12 is not particularly limited, and an appropriate shape can be adopted depending on the purpose. As an example, a square shape having a long side and a short side can be mentioned.
- the polarizing plate 12 has a rectangular shape, it is preferable that the absorption axis direction of the polarizing element 121 included in the polarizing plate 12 and the long side or the short side of the polarizing plate 12 are substantially parallel.
- substantially parallel is a concept including not only the case where it is strictly parallel but also the case where the angle formed by both lines is ⁇ 10 ° (preferably ⁇ 5 °).
- the thickness of the splitter 121 is not particularly limited, and an appropriate thickness can be adopted depending on the intended purpose.
- the thickness of the stator 121 is typically about 1 ⁇ m to 80 ⁇ m.
- a thin polarizing element may be used as the polarizing element 121.
- the thickness of the polarizing element 121 is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, still more preferably 10 ⁇ m or less, and particularly preferably 10 ⁇ m or less. It is 6 ⁇ m or less.
- the splitter 121 preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
- the simple substance transmittance of the extruder is preferably 40.0% or more, more preferably 41.0% or more, still more preferably 42.0% or more, and particularly preferably 43.0% or more.
- the degree of polarization of the polarizing element 121 is preferably 99.8% or more, more preferably 99.9% or more, and further preferably 99.95% or more.
- the polarizing element 121 is preferably an iodine-based polarizing element. More specifically, the stator 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 an appropriate resin can be used depending on the intended purpose. Examples thereof include polyvinyl alcohol and ethylene-vinyl alcohol copolymers.
- Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
- the ethylene-vinyl alcohol copolymer is obtained by saponifying the ethylene-vinyl acetate copolymer.
- the saponification degree of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. Is.
- the degree of saponification is determined according to JIS K 6726-1994. By using a PVA-based resin having such a saponification degree, a polarizing element having excellent durability can be obtained. If the degree of saponification is too high, gelation may occur.
- the average degree of polymerization of the PVA-based resin is not particularly limited and can be appropriately selected according to the purpose.
- the average degree of polymerization of the PVA-based resin is, for example, 1000 to 10000, preferably 1200 to 5000, and more preferably 1500 to 4500.
- the average degree of polymerization is determined according to JIS K 6726-1994.
- Examples of the method for producing the polarizing element 121 include a method (I) of stretching and dyeing a single PVA-based resin film, and a method of stretching and dyeing a laminate (i) having a resin base material and a polyvinyl alcohol-based resin layer (i). II) and the like. Since the method (I) is a well-known and customary method in the art, detailed description thereof will be omitted.
- a laminate (i) having a resin base material and a polyvinyl alcohol-based resin layer formed on one side of the resin base material is stretched and dyed, and polarized onto the resin base material.
- the laminate (i) can be formed by applying and drying a coating liquid containing a polyvinyl alcohol-based resin on a resin base material. Further, the laminate (i) may be formed by transferring a polyvinyl alcohol-based resin layer onto a resin substrate. Details of the above-mentioned production method (II) are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580, and this publication can be incorporated as a reference in the present specification.
- the first protective film 122 and the second protective film 123 are not particularly limited, and appropriate resin films can be adopted depending on the intended purpose.
- the material for forming the first protective film 122 and the second protective film 123 include polyester resins such as polyethylene terephthalate (PET), cellulose resins such as triacetyl cellulose (TAC), and cycloolefin resins such as norbornene resins. Examples thereof include olefin resins such as resins, polyethylene and polypropylene, and (meth) acrylic resins. Among these, polyethylene terephthalate (PET) is preferable.
- the "(meth) acrylic resin” refers to an acrylic resin and / or a methacrylic resin.
- the (meth) acrylic resin for example, a (meth) acrylic resin having a glutarimide structure is used.
- examples of the (meth) acrylic resin having a glutarimide structure include JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, and JP-A. 2006-328334, 2006-337491, 2006-337492, 2006-337493, 2006-337569, 2007-009182, 2009- It is described in Japanese Patent Application Laid-Open No. 161744 and Japanese Patent Application Laid-Open No. 2010-284840. These statements may be incorporated herein by reference.
- the first protective film 122, the second protective film 123, and the polarizing element 121 can be laminated via any suitable adhesive layer.
- the resin base material used for producing the polarizing element 121 is peeled off before or after laminating the first protective film 122 and the second protective film 123 and the polarizing element 121.
- the thickness of the first protective film 122 and the second protective film 123 is preferably 4 ⁇ m to 250 ⁇ m, more preferably 5 ⁇ m to 150 ⁇ m, further preferably 10 ⁇ m to 100 ⁇ m, and particularly preferably 10 ⁇ m to 50 ⁇ m.
- the elastic modulus of the first protective film 122 and the second protective film 123 is 1 GPa or more, preferably 1 GPa to 10 GPa, more preferably 1.8 GPa to 7 GPa, and further preferably 2 GPa to 5 GPa. Within such a range, a multi-layer structure 1A having excellent puncture resistance can be obtained.
- the pressure-sensitive adhesive layer 18 can be formed from any suitable pressure-sensitive adhesive.
- a pressure-sensitive adhesive using a polymer such as an acrylic polymer, a silicone-based polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based polymer, or a rubber-based polymer as a base polymer is used.
- an acrylic pressure-sensitive adhesive is used. This is because the acrylic pressure-sensitive adhesive is excellent in optical transparency, exhibits appropriate wettability, cohesiveness, and adhesiveness, 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 preferable.
- the thickness of the pressure-sensitive adhesive layer 18 is preferably 1 ⁇ m to 100 ⁇ m, more preferably 3 ⁇ m to 80 ⁇ m, and further preferably 3 ⁇ m to 50 ⁇ m. Within such a range, when the multilayer structure 1A is attached to an optical element such as a liquid crystal cell to produce an optical laminate, the optical laminate having excellent flexibility and puncture resistance can be obtained. can get.
- the release film 19 can be formed of, for example, a resin such as polyethylene terephthalate (PET), polyethylene (PE), or polypropylene (PP).
- the thickness of the release film 19 is preferably 5 ⁇ m to 125 ⁇ m, more preferably 20 ⁇ m to 75 ⁇ m, and further preferably 30 ⁇ m to 50 ⁇ m.
- the release film 19 is peeled off at the interface with the pressure-sensitive adhesive layer 18 before the multilayer structure 1A is attached to an optical element such as a liquid crystal cell.
- the resin layer 10 may be composed of one layer or may be composed of a plurality of layers.
- the thickness of the outer peripheral portion 101 by setting the thickness of the outer peripheral portion 101 to 5 ⁇ m or more, it is possible to prevent the influence of heat generated by the laser beam on the glass layer 30 when the resin layer 10 is processed by irradiating the resin layer 10 with the laser beam. ..
- the glass layer 30 from being cracked when the glass layer 30 is cut by the laser beam.
- the cutting method by the laser is the same as that of the first embodiment.
- a multi-layer structure having a different layer structure is produced, and the laser type, laser output conditions, and the thickness of the residual resin layer are changed to change the amount of protrusion of the glass layer or the resin layer and the glass layer.
- the presence or absence of cracks in the glass layer and the possibility of splitting the glass layer and the resin layer were examined.
- fsIR indicates a femtosecond laser
- CO 2 indicates a carbon dioxide gas laser.
- the outer peripheral portion and the inner portion may have the same thickness. That is, the resin layer and the residual resin layer may have the same thickness.
- Example 1 a multi-layer structure having the structure shown in FIG. 1 was produced by the manufacturing process shown in FIGS. 4, 5, 8 and 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 50 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- a polyethylene terephthalate resin was used as the material of the resin layer, and the thickness was about 105 ⁇ m.
- the thickness of the residual resin layer is 105 ⁇ m, which is the same as that of the resin layer.
- Example 2 a multi-layer structure having the structure shown in FIG. 1 was produced by the manufacturing process shown in FIGS. 4, 5, 8 and 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 100 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- Acrylic resin was used as the material of the resin layer, and the thickness was about 40 ⁇ m.
- the thickness of the residual resin layer is 40 ⁇ m, which is the same as that of the resin layer.
- Comparative Example 1 a multi-layer structure having the structure shown in FIG. 1 was produced by the manufacturing process shown in FIGS. 4, 5, 8 and 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 100 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- Acrylic resin was used as the material of the resin layer, and the thickness was about 188 ⁇ m.
- the thickness of the residual resin layer is 188 ⁇ m, which is the same as that of the resin layer.
- Example 3 a multi-layer structure having the structure shown in FIG. 1 was produced in the manufacturing process shown in FIGS. 4 to 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 100 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- Acrylic resin was used as the material of the resin layer, and the thickness was about 188 ⁇ m.
- the thickness of the residual resin layer was 20 ⁇ m.
- Example 4 a multi-layer structure having the structure shown in FIG. 11 was produced in the manufacturing process shown in FIGS. 4 to 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 100 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- Acrylic resin was used as the material of the first protective film, and the thickness was about 40 ⁇ m.
- a polyvinyl alcohol-based resin containing iodine was used as the material of the stator, and the thickness was about 5 ⁇ m.
- Acrylic resin was used as the material of the second protective film, and the thickness was about 40 ⁇ m.
- An acrylic polymer was used as the material of the pressure-sensitive adhesive layer, and the thickness was about 40 ⁇ m.
- Polyethylene terephthalate (PET) was used as the material of the release film, and the thickness was about 38 ⁇ m.
- the total thickness of the resin layer was about 160 ⁇ m.
- the thickness of the residual resin layer was 40 ⁇ m.
- Example 5 a multi-layer structure having the structure shown in FIG. 11 was produced in the manufacturing process shown in FIGS. 4 to 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 100 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- the layer structure of the resin layer was the same as that of Example 4, and the total thickness of the resin layer was about 160 ⁇ m.
- the thickness of the residual resin layer was 5 ⁇ m.
- Example 6 a multi-layer structure having the structure shown in FIG. 11 was produced in the manufacturing process shown in FIGS. 4 to 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 100 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- the layer structure of the resin layer was the same as that of Example 4, and the total thickness of the resin layer was about 160 ⁇ m.
- the thickness of the residual resin layer was 60 ⁇ m.
- Comparative Example 2 a multi-layer structure having the structure shown in FIG. 11 was produced in the manufacturing process shown in FIGS. 4 to 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 100 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- the layer structure of the resin layer was the same as that of Example 4, and the total thickness of the resin layer was about 160 ⁇ m.
- the thickness of the residual resin layer was set to 0 ⁇ m.
- Example 7 a multi-layer structure having the structure shown in FIG. 11 was produced in the manufacturing process shown in FIGS. 4 to 9.
- non-alkali glass was used as the material of the glass layer, and the thickness was about 100 ⁇ m.
- An ultraviolet curable epoxy adhesive was used as the material of the adhesive layer, and the thickness was about 1.5 ⁇ m.
- the layer structure of the resin layer was the same as that of Example 4, and the total thickness of the resin layer was about 160 ⁇ m.
- the thickness of the residual resin layer was 5 ⁇ m.
- the thickness of the residual resin layer 5 ⁇ m or more regardless of whether the laser that cuts the glass layer is fsIR or CO 2 . It can be said that there is. Further, when good breakability is also required, it can be said that the thickness of the residual resin layer is preferably 105 ⁇ m or less.
- the breakability of the glass layer and the resin layer is good regardless of whether the laser for cutting the glass layer is fsIR or CO 2 . Moreover, it can be said that the glass layer does not crack.
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Abstract
Description
[複層構造体]
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2は、第1実施形態に係る複層構造体を例示する底面図であり、複層構造体を樹脂層の下面側から視た図である。
樹脂層10は、ガラス層30等を積層する基材となる層であり、可撓性を有する。樹脂層10は、1つの層又は複数の層から構成されている。樹脂層10が複数の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10の総厚みは、可撓性の観点から20μm以上1000μm以下であればよく、好ましくは25μm以上500μm以下、より好ましくは50μm以上200μm以下の範囲である。樹脂層10が1層から構成される場合には、樹脂層10の厚みは、例えば、30μm以上50μm以下の範囲とすることができる。
接着剤層20としては、任意の適切な接着剤が用いられる。接着剤層20の厚みは、例えば、0.5μm以上25μm以下である。接着剤層20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、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)中間膜等が利用できる。
ガラス層30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30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。
図4~図9は、第1実施形態に係る複層構造体の製造工程を例示する図である。図4~図9を参照しながら、複層構造体の製造工程について、特にレーザを使用した切断工程を中心に説明する。まず、図4及び図5に示すように、樹脂層10とガラス層30とを接着剤層20を介して積層させたシート状の複層構造体1Sを準備する。複層構造体1Sにおいて、ガラス層30の厚みは10μm以上300μm以下である。また、樹脂層10の厚みは、5μm以上である。
第1実施形態の変形例1では、樹脂層が複数の層から構成されている複層構造体の例を示す。なお、第1実施形態の変形例1において、既に説明した実施形態と同一構成部についての説明は省略する場合がある。
測定温度:23℃
サンプルサイズ:幅2cm、長さ15cm
チャック間距離:10cm
引張速度:10mm/min。
偏光板12の厚みは、好ましくは5μm~300μmであり、より好ましくは10μm~250μmであり、更に好ましくは25μm~200μmであり、特に好ましくは25μm~100μmである。
偏光子121の厚みは、特に限定はなく、目的に応じて適切な厚みを採用できる。偏光子121の厚みは、代表的には、1μm~80μm程度である。偏光子121として薄型の偏光子を用いてもよく、この場合、偏光子121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、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122及び第2保護フィルム123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122及び第2保護フィルム123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、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、アクリル系樹脂及び/又はメタクリル系樹脂をいう。
粘着剤層18は、任意の適切な粘着剤から形成できる。粘着剤としては、例えば、アクリル系ポリマー、シリコーン系ポリマー、ポリエステル、ポリウレタン、ポリアミド、ポリエーテル、フッ素系やゴム系等のポリマーをベースポリマーとする粘着剤が用いられる。好ましくは、アクリル系粘着剤が用いられる。アクリル系粘着剤は、光学的透明性に優れ、適度な濡れ性と凝集性と接着性の粘着特性を示して、耐候性や耐熱性などに優れ得るからである。特に、炭素数が4~12のアクリル系ポリマーよりなるアクリル系粘着剤が好ましい。
離形フィルム19は、例えば、ポリエチレンテレフタレート(PET)、ポリエチレン(PE)、ポリプロピレン(PP)等の樹脂により形成できる。離形フィルム19の厚みは、好ましくは5μm~125μmであり、より好ましくは20μm~75μmであり、更に好ましくは30μm~50μmである。離形フィルム19は、複層構造体1Aが液晶セル等の光学素子に貼り付けられる前に、粘着剤層18との界面で剥離される。
実施例1では、図1に示す構造の複層構造体を図4、5、8、及び9に示す製造工程で作製した。実施例1で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約50μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。樹脂層の材料にはポリエチレンテレフタレート系樹脂を使用し、厚みは約105μmとした。残樹脂層の厚みは、樹脂層と同じ105μmである。
実施例2では、図1に示す構造の複層構造体を図4、5、8、及び9に示す製造工程で作製した。実施例2で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約100μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。樹脂層の材料にはアクリル系樹脂を使用し、厚みは約40μmとした。残樹脂層の厚みは、樹脂層と同じ40μmである。
比較例1では、図1に示す構造の複層構造体を図4、5、8、及び9に示す製造工程で作製した。比較例1で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約100μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。樹脂層の材料にはアクリル系樹脂を使用し、厚みは約188μmとした。残樹脂層の厚みは、樹脂層と同じ188μmである。
実施例3では、図1に示す構造の複層構造体を図4~図9に示す製造工程で作製した。実施例3で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約100μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。樹脂層の材料にはアクリル系樹脂を使用し、厚みは約188μmとした。残樹脂層の厚みは、20μmとした。
実施例4では、図11に示す構造の複層構造体を図4~図9に示す製造工程で作製した。実施例4で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約100μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。第1保護フィルムの材料にはアクリル系樹脂を使用し、厚みは約40μmとした。偏光子の材料にはヨウ素を含むポリビニルアルコール系樹脂を使用し、厚みは約5μmとした。第2保護フィルムの材料にはアクリル系樹脂を使用し、厚みは約40μmとした。粘着剤層の材料にはアクリル系ポリマーを使用し、厚みは約40μmとした。離形フィルムの材料にはポリエチレンテレフタレート(PET)を使用し、厚みは約38μmとした。樹脂層の総厚みは約160μmとした。残樹脂層の厚みは、40μmとした。
実施例5では、図11に示す構造の複層構造体を図4~図9に示す製造工程で作製した。実施例5で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約100μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。樹脂層の層構成は実施例4と同じであり、樹脂層の総厚みは約160μmとした。残樹脂層の厚みは、5μmとした。
実施例6では、図11に示す構造の複層構造体を図4~図9に示す製造工程で作製した。実施例6で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約100μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。樹脂層の層構成は実施例4と同じであり、樹脂層の総厚みは約160μmとした。残樹脂層の厚みは、60μmとした。
比較例2では、図11に示す構造の複層構造体を図4~図9に示す製造工程で作製した。比較例2で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約100μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。樹脂層の層構成は実施例4と同じであり、樹脂層の総厚みは約160μmとした。残樹脂層の厚みは、0μmとした。
実施例7では、図11に示す構造の複層構造体を図4~図9に示す製造工程で作製した。実施例7で作製した複層構造体において、ガラス層の材料には無アルカリガラスを使用し、厚みは約100μmとした。接着剤層の材料には紫外線硬化性エポキシ系接着剤を使用し、厚みは約1.5μmとした。樹脂層の層構成は実施例4と同じであり、樹脂層の総厚みは約160μmとした。残樹脂層の厚みは、5μmとした。
図12の実施例1、実施例2、及び比較例1より、残樹脂層の厚みが188μmでは分断性が悪いが、105μm以下であれば分断性は良好である。また、実施例3~7の結果においても、この点は示されている。
10 樹脂層
10a、30a 上面
10b、30b 下面
10c、30c 側面
10x 溝
12 偏光板
18 粘着剤層
19 離形フィルム
20 接着剤層
30 ガラス層
101 外周部
102 内側部
103 傾斜部
105 残樹脂層
121 偏光子
122 第1保護フィルム
123 第2保護フィルム
Claims (12)
- 樹脂層と、
前記樹脂層上に接着剤層を介して積層されたガラス層と、を有し、
前記ガラス層の厚みは、10μm以上300μm以下であり、
前記樹脂層の外周部は、厚みが5μm以上である、複層構造体。 - 前記外周部の端部は、前記ガラス層の側面から突出しており、
前記外周部の端部の、前記ガラス層の側面からの突出量は、0μmより大きく10μm以下である、請求項1に記載の複層構造体。 - 前記樹脂層は、前記外周部より内側に、前記外周部より厚い肉厚部を有する、請求項1又は2に記載の複層構造体。
- 前記樹脂層は、前記肉厚部と前記外周部との間に、前記外周部から前記肉厚部に向かうにしたがって厚みが漸増する傾斜部を有する、請求項3に記載の複層構造体。
- 前記樹脂層の前記ガラス層とは反対側から視て、前記傾斜部及び前記外周部は、前記肉厚部の周囲に環状に設けられている、請求項4に記載の複層構造体。
- 前記樹脂層は、複数の層から構成されている、請求項1乃至5の何れか一項に記載の複層構造体。
- 前記複数の層は、偏光子を有する偏光板を含む、請求項6に記載の複層構造体。
- 樹脂層と、前記樹脂層上に接着剤層を介して積層されたガラス層と、を有し、複数の製品領域が画定された第1複層構造体を準備する工程と、
前記第1複層構造体の各々の前記製品領域の外周部に、前記ガラス層側からレーザ光を照射して前記ガラス層及び前記樹脂層を切断し、各々の前記製品領域を個片化して複数の複層構造体を作製する工程と、を有し、
前記ガラス層の厚みは、10μm以上300μm以下であり、
前記樹脂層の厚みは、5μm以上である、複層構造体の製造方法。 - 前記第1複層構造体を準備する工程と、前記複数の複層構造体を作製する工程と、の間に、
前記第1複層構造体の各々の前記製品領域の外周部に、前記樹脂層側からレーザ光を照射し、前記樹脂層に、底面側に残樹脂層を備えた溝を形成する工程を有し、
前記複数の複層構造体を作製する工程では、前記第1複層構造体の各々の前記製品領域の外周部に、前記ガラス層側からレーザ光を照射して前記ガラス層及び前記残樹脂層を切断し、各々の前記製品領域を個片化して複数の複層構造体を作製する、請求項8に記載の複層構造体の製造方法。 - 前記溝を形成する工程では、炭酸ガスレーザを使用する、請求項9に記載の複層構造体の製造方法。
- 前記複数の複層構造体を作製する工程では、フェムト秒レーザを使用する、請求項8乃至10の何れか一項に記載の複層構造体の製造方法。
- 前記複数の複層構造体を作製する工程では、前記樹脂層の外周部が前記ガラス層の側面から突出し、
前記外周部の、前記ガラス層の側面からの突出量は、0μmより大きく10μm以下である、請求項8乃至11の何れか一項に記載の複層構造体の製造方法。
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Also Published As
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KR20230101894A (ko) | 2023-07-06 |
EP4245524A4 (en) | 2024-04-10 |
US20240017527A1 (en) | 2024-01-18 |
CN116685433A (zh) | 2023-09-01 |
JP2022078516A (ja) | 2022-05-25 |
EP4245524A1 (en) | 2023-09-20 |
TW202226608A (zh) | 2022-07-01 |
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