Glass laminate production method, molded package production method, glass laminate, and molded package

Abstract

This glass laminate production method comprises: a supply step for supplying a coupling agent to both surfaces of a glass film; a formation step for heating the glass film to which the coupling agent has been supplied and forming a coupling agent layer on both surfaces of the glass film; and an adhesion step for adhering, to one surface of the glass film via the coupling agent layer, a resin member capable of transmitting light.

Description

Manufacturing method of glass laminate, manufacturing method of molded package, glass laminate and molded package

[0001] The technology disclosed in this specification relates to a method for manufacturing a glass laminate, a glass laminate, a method for manufacturing a molded package, and a molded package.

[0002] A flexible mold capable of elastic bending deformation is sometimes used in a manufacturing process of an optical device, etc. For example, Patent Document 1 discloses an imprinting mold in which a molding material is formed on a substrate made of a glass sheet and a resin sheet.

[0003] Japanese Patent Application Laid-Open No. 2020-49656

[0004] Patent Literature 1 discloses that, when a molding material for an imprint mold is formed on a main surface of a glass sheet, a silane coupling treatment layer is formed in advance on a main surface of a single glass sheet, and then a resin sheet is bonded to the other main surface of the glass sheet via an adhesive layer to produce a substrate. However, in the case of a thin glass film such as a glass sheet, significant warping occurs in the glass film before the resin member is bonded, which may make it difficult to bond the resin member and the glass film together.

[0005] An object of the present specification is to provide a method for manufacturing a glass laminate that can suppress the occurrence of warping in a glass film before bonding a resin member.

[0006] A first aspect of the technology disclosed in this specification is a method for manufacturing a glass laminate, the method including: a supplying step of supplying a coupling agent to both surfaces of a glass film; a forming step of heating the glass film to which the coupling agent has been supplied to form coupling agent layers on both surfaces of the glass film; and a bonding step of bonding a light-transmitting resin member to one surface of the glass film via the coupling agent layer.

[0007] When a resin mold layer of an imprint mold package is formed on the surface of a glass film, forming a coupling agent layer on the surface of the glass film allows the resin mold layer, which is difficult to adhere directly to the glass film, to be disposed on the surface of the glass film via the coupling agent layer. In an embodiment in which the coupling agent is supplied to only one surface of the glass film, as in the technology of Patent Document 1, warping occurs in the glass film due to film stress generated by the difference in thermal expansion coefficients between the glass film and the coupling agent. In the above configuration, by disposing the coupling agent layers on both sides of the glass film, film stress during the heat treatment process can be suppressed, and warping of the glass film can be reduced before the resin member is bonded.

[0008] A second aspect of the technology disclosed in this specification is the first aspect, wherein the supplying step may include a step of immersing both surfaces of the glass film in the coupling agent in a liquid state.

[0009] In the above configuration, the coupling agent can be supplied evenly to both surfaces of the glass film.

[0010] A third form of the technology disclosed in this specification is that, in the first or second form, the resin member is in the form of a film, and in the bonding process, the resin member may be bonded to one side of the glass film via the coupling agent layer and the adhesive layer.

[0011] By bonding the film-like resin members with the adhesive layer, a glass laminate can be produced efficiently.

[0012] A fourth form of the technology disclosed in this specification is that, in the above-mentioned first to third forms, when the maximum length of the glass film after the forming process and before the bonding process is L and the height of the glass film from a horizontal plane when the glass film is placed on the horizontal plane is H, H / L may be 0.05 or less.

[0013] By suppressing the amount of warping of the glass film and the coupling agent layer after the heat treatment step, it is possible to suppress the occurrence of warping in the glass laminate and to facilitate bonding of the glass film and the resin member.

[0014] A fifth aspect of the technology disclosed herein is a method for manufacturing a molded package, the method including: a supplying step of supplying a coupling agent to both surfaces of a glass film; a forming step of heating the glass film to which the coupling agent has been supplied to form coupling agent layers on both surfaces of the glass film; a bonding step of adhering a light-transmittable resin member to one surface of the glass film via the coupling agent layer; a resin disposing step of disposing a light-curable molding resin on the other surface of the glass film via the coupling agent layer; and a molding step of irradiating the molding resin with light while the molding resin is in close contact with a molding die to cure the molding resin and form a molding concave-convex portion.

[0015] By forming a coupling agent layer on at least one side of the glass film, a molding resin can be disposed on the glass film via the coupling agent layer. By disposing the coupling agent layers on both sides of the glass film, warping of the glass film and the coupling agent layer during a heat treatment process can be suppressed. This can suppress warping of the resin mold and facilitate bonding of the glass film to a resin member.

[0016] According to a sixth aspect of the technology disclosed in this specification, in the fifth aspect, the resin member may be in the form of a film.

[0017] A seventh form of the technology disclosed in this specification is the fifth or sixth form, wherein in the bonding step, a resin member capable of transmitting light through the coupling agent layer and the adhesive layer may be bonded to one side of the glass film.

[0018] By bonding the film-like resin member with an adhesive layer, the molded package can be manufactured efficiently.

[0019] An eighth aspect of the technology disclosed herein is a glass laminate including a glass film, coupling agent layers disposed on both sides of the glass film, an adhesive layer disposed on one side of the glass film via the coupling agent layer, and a light-transmitting resin member bonded to the one side of the glass film via the coupling agent layer and the adhesive layer.

[0020] By forming a coupling agent layer on the surface of the glass film, a material that is difficult to apply directly to the glass film can be applied to the surface of the glass film via the coupling agent layer. In an embodiment in which the coupling agent is applied to only one surface of the glass film, warping occurs in the glass film and the coupling agent layer due to film stress caused by the difference in thermal expansion coefficients between the glass film and the coupling agent. In the above configuration, by applying the coupling agent layer to both sides of the glass film, film stress during the heat treatment process can be suppressed, and warping of the glass plate can be reduced.

[0021] As a ninth aspect of the technology disclosed in the present specification, in the eighth aspect, the glass film may have a thickness of 10 μm or more and 300 μm or less.

[0022] By disposing the coupling agent layers on both surfaces of the glass film, it is possible to suppress the occurrence of warping in the glass film even when the glass film is thin and has low rigidity.

[0023] A tenth aspect of the technology disclosed herein is a molded package. The molded package includes a glass laminate including a glass film, coupling agent layers formed on both sides of the glass film, and a light-transmitting resin member bonded to one side of the glass film via the coupling agent layer, and a molding concave-convex portion disposed on the other side of the glass film of the glass laminate, the resin member being on the side opposite the glass laminate.

[0024] A molding resin can be disposed on the surface of the glass film. In the glass laminate, the glass film is less susceptible to deformation due to external factors than the resin member. This can prevent the molding resin from deforming in association with the deformation of the glass laminate, thereby preventing distortion of the molding concave-convex portion of the molding resin. As a result, a precise molding concave-convex portion can be formed.

[0025] An eleventh aspect of the technology disclosed in this specification, in the tenth aspect, may further include an adhesive layer disposed on the one surface of the glass film.

[0026] FIG. 1 shows a longitudinal cross-sectional view of a molded package of an embodiment; FIG. 2 shows a flowchart illustrating a manufacturing method of a molded package of an embodiment; FIG. 3 shows a schematic perspective view illustrating a glass film and a liquid tank for explaining a supplying process of an embodiment; FIG. 4 shows a schematic side view illustrating a warped state of a glass film and a coupling agent layer after a forming process of an embodiment; FIG. 5 shows a longitudinal cross-sectional view of a molding resin, a glass laminate, and a molding die for explaining a molding process of an embodiment; FIG. 6 shows a longitudinal cross-sectional view illustrating nanoimprinting using a molded package of an embodiment; and FIG. 7 shows a longitudinal cross-sectional view illustrating release of a molded package of an embodiment from a workpiece.

[0027] FIG. 1 shows a longitudinal cross-section of a molded package 10, taken along a vertical plane passing through the center of the molded package 10. The molded package 10 includes a glass laminate 20 including a glass film 12, a pair of coupling agent layers 14 and 16, an adhesive layer 17, and a resin member 18, and a molding resin 21. In a plan view (i.e., viewed from above in FIG. 1 ), the molded package 10 has a rectangular shape. Note that the shape of the molded package 10 in a plan view is not particularly limited. Note that the thicknesses of the layers 12, 14, 16, 17, 18, and 21 are not accurately reflected. The molded package 10 has flexibility, allowing for elastic bending deformation. Therefore, the molded package 10 can be deformed to a shape that conforms to the object it contacts. For example, the molded package 10 can be deformed into a flat shape as shown in FIG. 1 , or into an endless bent shape like a roll or endless belt. In other words, the molded package 10 in FIG. 1 has so-called flexibility. The glass laminate 20, the glass film 12, and the resin member 18 also have flexibility.

[0028] The glass film 12 is less susceptible to deformation due to external factors such as thermal contraction than the resin member 18. Therefore, by using the glass film 12 as the mold package 10, a mold with high dimensional accuracy can be manufactured.

[0029] The glass film 12 is a flat, thin-film glass having a thickness of 10 μm or more and 300 μm or less. As described above, considering the case where the molded package 10 is used after being deformed from its flat shape, the glass film 12 preferably has a thickness of 200 μm or less, more preferably 100 μm or less. On the other hand, in consideration of the mechanical strength of the glass film 12, the glass film 12 preferably has a thickness of 30 μm or more, more preferably 50 μm or more. The glass film 12 is produced, for example, by the overflow method. In the overflow method, molten glass is allowed to overflow from a trough-shaped container. The glass overflowing from the container flows downward along both side surfaces of the container. The bottom surface of the container has a triangular prism shape that tapers downward from the lower end of the side surface. The glass flows along the bottom surface and meets at the apex of the lower end of the triangular prism shape. A thin film of glass is produced by cooling the glass flowing below the bottom surface of the container. Furthermore, by producing the glass film 12 by this method, the surface of the glass film 12 can be formed to be very smooth.

[0030] The glass film 12 has a composition similar to that of, for example, alkali-free glass, borosilicate glass, soda glass (e.g., soda-lime glass), high-silica glass, or other oxide-based glass containing silicon oxide as a main component. The glass film 12 may also be chemically strengthened glass, in which case aluminosilicate glass can be used. The glass film 12 preferably has high transmittance of ultraviolet light (e.g., wavelength of 365 nm) and a low thermal expansion coefficient. Specifically, the glass film 12 is preferably made of alkali-free glass containing 0.5% by mass or less of alkali metal oxide. The glass film 12 preferably has an ultraviolet transmittance of 50% or more, and more preferably has an ultraviolet transmittance of 75% or more.

[0031] Coupling agent layers 14, 16 are disposed on both surfaces 12a, 12b of the glass film 12. The coupling agent layers 14, 16 are made of a silane coupling agent. The silane coupling agent may be, for example, a coupling agent whose functional group is an epoxy group (e.g., 3-glycidoxypropyltrimethoxysilane), a coupling agent whose functional group is an amino group (e.g., 3-aminopropyltriethoxysilane), a coupling agent whose functional group is a methacryl group (e.g., 3-methacryloxypropyltriethoxysilane), or a coupling agent whose functional group is an acrylic group (e.g., 3-acryloxypropyltrimethoxysilane). The coupling agent of the coupling agent layer 14 may also be made of a coupling agent other than a silane coupling agent, such as a titanate-based or aluminate-based coupling agent. Each of the coupling agent layers 14, 16 has a thickness of 1.0 μm or less. The thickness of the coupling agent layers 14, 16 can be adjusted, for example, by the method of supplying the coupling agent to the glass film 12. By forming the coupling agent layer 16 on the surface 12b of the glass film 12, a molding resin 21 (described later), which is difficult to adhere directly to the glass film 12, can be placed on the surface 12b of the glass film 12 via the coupling agent layer 16.

[0032] A resin member 18 is bonded to one surface 12a (the lower surface in FIG. 1 ) of the glass film 12, sandwiching a coupling agent layer 14 between them. If the glass film 12 were configured without the resin member 18, the glass film 12 would easily break upon impact or be too thin and difficult to handle. The use of the resin member 18 can reduce cracking while facilitating handling. Examples of adhesives for bonding the glass film 12 and the resin member 18 include optically clear adhesives (i.e., OCA: Optical Clear Adhesive) and pressure-sensitive adhesives (i.e., PSA: Pressure Sensitive Adhesive). Examples of adhesive components that can be used include acrylic adhesives, silicone adhesives, epoxy adhesives, and photocurable adhesives (e.g., UV-curable adhesives). The UV transmittance of the adhesive is preferably 50% or higher, more preferably 75% or higher. Taking into consideration light transmittance and other factors, the adhesive member is preferably made of an optically clear adhesive. 1, the coupling agent layer 14 and the resin member 18 are bonded to each other by OCA. An adhesive layer 17 made of OCA is disposed between the coupling agent layer 14 and the resin member 18.

[0033] The resin member 18 is a flat plate made of, for example, epoxy (EP), polyamide (PA), polyamideimide (PAI), polyetheretherketone (PEEK), polybenzimidazole (PBI), polyethylene terephthalate (PET), polyethersulfone (PES), cyclic polyolefin (COP), polycarbonate (PC), polyvinyl chloride (PVC), urethane (PU), etc. In Fig. 1, the resin member 18 is a flat plate made of polyethylene terephthalate resin.

[0034] The resin member 18 preferably has a high transmittance of ultraviolet light, and the transmittance of the resin member 18 alone to ultraviolet light is preferably 50% or more, and more preferably 75% or more.

[0035] The resin member 18 is larger than the glass film 12 in a plan view. The resin member 18 preferably has a thickness of, for example, 10 to 500 μm. When the thickness of the resin member 18 is 500 μm or less, the resin member 18 can be said to be in the form of a film. However, from the viewpoint of improving flexibility and ultraviolet transmittance, the thickness of the resin member 18 is more preferably 30 to 300 μm, and from the viewpoint of improving handleability, the thickness is more preferably 50 to 200 μm.

[0036] A molding resin 21 is bonded to the other surface 12b (top surface in FIG. 1 ) of the glass film 12, with a coupling agent layer 16 sandwiched therebetween. The molding resin 21 is made of a resin for nanoimprinting. In the case of a photoimprinting method, the molding resin 21 may be, for example, a photocurable resin. In FIG. 1 , a photoimprinting method using ultraviolet light is used as the nanoimprinting method, and an ultraviolet-curable resin that does not require heat for curing is used as the molding resin 21. An uneven portion 22 is arranged on a surface 21a of the molding resin 21 opposite the glass film 12. The uneven portion 22 has an uneven shape for forming a diffraction grating on a panel for a head-up display that displays images, etc., in front of a driver of a vehicle, for example.

[0037] (Method for Manufacturing Molded Package) A method for manufacturing the molded package 10 will be described with reference to Fig. 2 to Fig. 5. The molded package 10 is manufactured by first preparing a glass laminate 20 and then placing a molding resin 21 on the prepared glass laminate 20.

[0038] As shown in Fig. 2 , the glass laminate 20 is produced in steps S12 to S18. In step S12, a preparation step of preparing the glass film 12 is performed. As described above, the glass film 12 is prepared by, for example, an overflow method. The method of producing the glass film 12 is not particularly limited. The preparation step may include cleaning the surface of the glass film 12.

[0039] In S14, a supplying step is performed in which a coupling agent is supplied to each of the surfaces 12a and 12b of the glass film 12 prepared in S12. For example, as shown in FIG. 3 , the glass film 12 is immersed in a liquid tank 100 containing a liquid coupling agent and then pulled out, i.e., so-called dipping, to supply the coupling agent to both surfaces 12a and 12b of the glass film 12. This configuration prevents the coupling agent from being unevenly supplied to each of the surfaces 12a and 12b of the glass film 12. Furthermore, by comparing the surfaces 12a and 12b of the glass film 12, the amounts of coupling agent supplied to both surfaces, i.e., the thicknesses of the coupling agent, can be made uniform. Furthermore, the thicknesses of the coupling agent layers 14 and 16 can be set to the thickness described above (1.0 μm or less). Alternatively, the coupling agent can be supplied to the surfaces 12a and 12b of the glass film 12 by spraying, applying by spin coating, or applying by printing such as gravure printing or screen printing.

[0040] In S16, a forming step is performed in which, for example, the glass film 12 to which the coupling agent has been supplied is heated and cooled to form coupling agent layers 14, 16 on the surfaces 12a, 12b of the glass film 12. The heating and cooling conditions are set appropriately depending on the coupling agent. For example, in the case of a silane coupling agent, the glass film 12 is heated to a temperature in the range of 80°C to 130°C, maintained for a predetermined period (e.g., approximately 1 to 60 minutes), and then cooled to room temperature.

[0041] A glass film 12 having a coupling agent layer formed thereon may warp due to membrane stress caused by the difference in thermal expansion coefficient between the glass film 12 and the coupling agent layer. Warping is particularly pronounced when the coupling agent layer is formed only on one side of the glass film 12. In FIG. 4 , the coupling agent layers 14 and 16 are disposed on both surfaces 12a and 12b of the glass film 12, so membrane stress acts on both surfaces, and these stresses are offset. Therefore, warping of the glass film 12 is suppressed. However, there are cases where the stresses are not completely offset. In such cases, as shown in FIG. 4 , warping may occur such that the coupling agent layer 16 side is convex, or such that the coupling agent layer 14 side is convex.

[0042] Because the glass film 12 is thin, even slight uneven distribution of the coupling agent when it is supplied can cause warping of the glass film 12. When the glass film 12 has a rectangular shape, warping is likely to occur in the longitudinal direction.

[0043] As shown in Figure 4, when the glass film 12 is warped, it is placed on a horizontal surface HS, such as a workbench, so that it curves upward. If the warp is such that the coupling agent layer 14 side is convex, the glass film 12 is placed upside down from Figure 4, with the coupling agent layer 14 side facing upward. The relationship H / L, between the length L of both ends of the glass film 12 when viewed from the direction in which the curved surface of the glass film 12 extends (the direction perpendicular to the paper surface of Figure 4) and the height H from the horizontal surface HS to the highest point of the glass film 12, is preferably 0.05 or less, because this ensures stability of the glass film 12 on the horizontal surface HS. Preferably, H / L is 0.03 or less. While Figure 4 shows both end edges of the glass film 12 in contact with the horizontal surface HS along their entire length, the glass film 12 may twist due to heating and cooling. In this case, at least one of the end edges of the glass film 12 does not contact the horizontal surface HS along its entire length. In this case, the length L is the maximum length of both end edges of the glass film 12 when the glass film 12 is stably stationary on the horizontal plane HS.

[0044] For example, when a coupling agent layer is formed on only one side of the glass film 12, H / L is 0.2 to 0.3. On the other hand, when a coupling agent layer is formed on both sides of the glass film 12, H / L is 0.05 or less.

[0045] Returning to Fig. 2 , in S18, a bonding step is performed in which the resin member 18 is bonded to the surface 12a of the glass film 12 via the coupling agent layer 14 and the adhesive layer 17. The adhesive layer 17 included in the glass laminate 20 may be thicker or thinner than the coupling agent layer 14. In this manner, the glass laminate 20 is produced.

[0046] Next, in S20, a resin disposing step is performed in which a molding resin 21 is disposed on the surface 12b of the glass film 12 with a coupling agent layer 16 sandwiched therebetween. Specifically, an ultraviolet-curable resin material is disposed on the coupling agent layer 16. The molding resin 21 is difficult to bond to the glass film 12. In the glass laminate 20, by disposing the coupling agent layer 16 on the glass film 12, the glass film 12 and the molding resin 21 can be firmly bonded to each other.

[0047] Furthermore, the coupling agent layers 14 and 16 suppress warping of the glass film 12, thereby suppressing curvature of the molding resin 21.

[0048] In S22, a molding step is performed to form a concave-convex portion 22 for nanoimprint molding on the surface 21a of the molding resin 21. Specifically, as shown in Fig. 5, a metal master die 50 is brought into contact with the surface 21a of the molding resin 21 and the two are pressed together, thereby transferring the shape of the master die 50 to the molding resin 21 and forming the concave-convex portion 22 on the surface 21a. Thereafter, ultraviolet light is irradiated onto the molding resin 21, thereby forming concave-convex portions in the molding resin 21 corresponding to the master die 50. In this way, the molded package 10 is produced.

[0049] 6 , in the fabricated molded package 10, the uneven portion 22 on the surface 21 a of the molding resin 21 is pressed against a workpiece 200 such as a panel for a head-up display and cured by heating or light irradiation, thereby transferring the shape of the uneven portion 22 to the workpiece 200. This allows a shape such as a diffraction grating to be formed in the workpiece 200. Specifically, the workpiece 200 is composed of a main body 201 and an ultraviolet-curable resin 202, and the ultraviolet-curable resin 202 is pressed against the surface 21 a of the molding resin 21, and then the shape of the uneven portion 22 is transferred to the workpiece 200 by light irradiation.

[0050] As shown in FIG. 7 , after the workpiece 200 is molded, the mold package 10 is released from the workpiece 200. In the mold package 10, the glass film 12 is made of a thin film. Therefore, by bending the mold package 10, the mold package 10 can be easily peeled off from the workpiece 200. The workpiece 200 can be used as a product as is, or it can be attached to another object (e.g., a plate) to form a product. Furthermore, after the workpiece 200 is attached to another object, the workpiece 200 can be pressed against the surface 21 a of the molding resin 21.

[0051] The glass film 12 is less susceptible to deformation due to environmental factors such as temperature and humidity, compared to the resin member 18. In the molded package 10, a molding resin 21 can be disposed on the glass film 12. With this configuration, the molding resin 21 can suppress the influence of environmental deformation of the glass laminate 20, compared to a configuration in which the molding resin 21 is disposed on the resin member 18. This allows the molded package 10 to be used for nanoimprinting shapes that require an accuracy of 10 micrometers, such as diffraction gratings for head-up displays.

[0052] Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. The technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives alone is technically useful.

[0053] 10: mold package, 12: glass film, 14, 16: coupling agent layer, 17: adhesive layer, 18: resin member, 20: glass laminate, 21: molding resin, 22: uneven portion

Claims

1. A method for manufacturing a glass laminate, comprising: a supplying step of supplying a coupling agent to both sides of a glass film; a forming step of heating the glass film to which the coupling agent has been supplied to form coupling agent layers on both sides of the glass film; and a bonding step of bonding a resin member that can transmit light through the coupling agent layer to one side of the glass film.

2. The method for manufacturing a glass laminate according to claim 1, wherein the supplying step includes a step of immersing both surfaces of the glass film in the coupling agent in a liquid state.

3. A method for manufacturing a glass laminate as described in claim 1 or 2, wherein the resin member is in the form of a film, and in the bonding process, the resin member is bonded to the one surface of the glass film via the coupling agent layer and the adhesive layer.

4. The method for manufacturing a glass laminate according to claim 1 or 2, wherein after the forming step and before the bonding step, a maximum length of the glass film is L, and a height of the glass film from a horizontal plane in a state in which the glass film is placed on the horizontal plane is H, and H / L is 0.05 or less.

5. A method for manufacturing a molded package, comprising: a supplying step of supplying a coupling agent to both sides of a glass film; a forming step of heating the glass film to which the coupling agent has been supplied to form coupling agent layers on both sides of the glass film; a bonding step of adhering a resin member capable of transmitting light via the coupling agent layer to one side of the glass film; a resin disposing step of disposing a molding resin that is hardened by the light via the coupling agent layer on the other side of the glass film; and a molding step of hardening the molding resin by irradiating the molding resin with the light while the molding resin is in close contact with a molding die, thereby forming a molding uneven portion.

6. The method for manufacturing a molded package according to claim 5, wherein the resin member is in the form of a film.

7. A method for manufacturing a molded package according to claim 5 or 6, wherein in the bonding step, the resin member is bonded to the one surface of the glass film via the coupling agent layer and an adhesive layer.

8. A glass laminate comprising: a glass film; coupling agent layers disposed on both sides of the glass film; an adhesive layer disposed on one side of the glass film via the coupling agent layer; and a light-transmitting resin member adhered to the one side of the glass film via the coupling agent layer and the adhesive layer.

9. The glass laminate according to claim 8, wherein the glass film has a thickness of 10 μm or more and 300 μm or less.

10. A molded package comprising: a glass laminate comprising a glass film, coupling agent layers disposed on both sides of the glass film, and a light-transmitting resin member adhered to one side of the glass film via the coupling agent layer; and a resin molded layer disposed on the other side of the glass film of the glass laminate, and having a molding concave-convex portion on the side opposite the glass laminate.

11. The molded package according to claim 10, further comprising an adhesive layer disposed on said one surface of said glass film via said coupling agent layer.

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