Heat insulating glass unit

Abstract

The present invention provides a heat insulating glass unit which is enhanced in terms of safety against injury of a user since glass fragments are not likely to scatter or glass fragments are fine in cases where the heat insulating glass unit is broken. Disclosed is a heat insulating glass unit which comprises a first glass layer, a second glass layer, a third glass layer that is disposed between the first and second glass layers, a first space that is defined between the first glass layer and the third glass layer, and a second space that is defined between the second glass layer and the third glass layer. The heat insulating glass unit is provided with a scattering prevention film on at least one main surface of the third glass layer.

Description

Insulating Glass Unit

[0001] The present invention relates to an insulating glass unit.

[0002] Insulated glass units (IGUs) are used in a variety of applications, including buildings, automobiles, displays, and electrical appliances. The use of IGUs in multi-pane windows in buildings and automobiles can improve the insulation of the interior of the building or automobile from the external environment. An IGU typically consists of two or more glass sheets hermetically sealed at their peripheral edges. The two or more glass sheets are spaced apart, and the space between the glass sheets is filled with an inert gas, such as argon or krypton, or a mixture of inert gases. These configurations provide the insulating properties of the IGU.

[0003] For example, an insulating glass unit having three glass sheets spaced apart with two spaces between them provides higher heat resistance than an insulating glass unit having two glass sheets with one space between them. However, using three glass sheets increases costs, weight, and thickness. To address this issue, an insulating glass unit has been proposed in which the glass sheets are adjusted to a predetermined thickness and thermal expansion coefficient (see, for example, Patent Document 1).

[0004] International Publication No. 2019 / 126521

[0005] In applications such as buildings and automobiles, one side of the glass faces the outdoors and is exposed to wind, rain, sand, and dust for long periods of time. Chemically or physically strengthened glass is therefore used to prevent breakage. However, even glass that is resistant to breakage can be subjected to unexpected external impacts in unavoidable situations such as natural disasters and accidents. As a result, there is a risk of injury to users who come into contact with broken glass fragments. This issue also applies to insulating glass units made of glass sheets.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide an insulating glass unit that, in the event of breakage, is less likely to shatter glass fragments or the glass fragments are small, thereby increasing safety against injury to the user.

[0007] The present invention relates to the following: 1. An insulating glass unit including a first glass layer, a second glass layer, a third glass layer disposed between the first glass layer and the second glass layer, a first space defined between the first glass layer and the third glass layer, and a second space defined between the second glass layer and the third glass layer, wherein the insulating glass unit is provided with a shatterproof film on at least one major surface of the third glass layer. 2. The insulating glass unit according to item 1, wherein the shatterproof film has polyethylene terephthalate as a base material. 3. The insulating glass unit according to item 1 or 2, wherein the thickness of the third glass layer is 0.4 mm to 2.0 mm. 4. The insulating glass unit according to item 1 or 2, wherein the thicknesses of the first glass layer and the second glass layer are 1.6 mm to 6.0 mm. 5. 5. The insulating glass unit according to claim 1 or 2, wherein the third glass layer comprises: a first shatterproof film provided on a main surface of the third glass layer facing the first space and in contact with the first space; and a second shatterproof film provided on a main surface of the third glass layer facing the second space and in contact with the second space. 6. The insulating glass unit according to claim 1 or 2, wherein the first glass layer, the second glass layer, and the third glass layer are made of soda-lime glass. 7. The soda-lime glass contains, in terms of mass percentage on an oxide basis, SiO ２ 65 to 74%, Al ２ O ３ 0 to 8.6%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ Contains 0 to 0.4% of (Na ２ O+K２ O) / Al ２ O ３ is 2.2 to 4. 8. The insulating glass unit according to any one of claims 1 or 2, wherein at least one of the first glass layer and the second glass layer is physically tempered glass. 9. The insulating glass unit according to any one of claims 1 or 2, wherein at least one of the first space and the second space is filled with an insulating gas or a mixed gas of an insulating gas and air. 10. The insulating glass unit according to any one of claims 9, wherein the insulating gas includes at least one selected from nitrogen, helium, neon, argon, krypton, and xenon. 11. The insulating glass unit according to any one of claims 5 to 5, wherein the thickness of the first shatterproof film is greater than the thickness of the second shatterproof film. 12. The insulating glass unit according to any one of claims 5 to 5, wherein the strength of the first shatterproof film is greater than the strength of the second shatterproof film. 13. 14. The insulating glass unit according to claim 1 or 2, wherein the first shatterproof film has a substrate and a first adhesive layer provided on the surface of the substrate facing the third glass layer, and the second shatterproof film has a substrate and a second adhesive layer provided on the surface of the substrate facing the third glass layer, and the strength of the first adhesive layer is greater than the strength of the second adhesive layer. 15. The insulating glass unit according to claim 1 or 2, wherein the glass composition of the first glass layer and the second glass layer is different from the glass composition of the third glass layer. 16. The insulating glass unit according to claim 1, wherein the third glass layer contains SiO2 expressed in terms of mass percentage on an oxide basis. ２ 65 to 72%, Al ２ O ３ 3.4 to 8.6%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ 16. The insulated glass unit according to claim 14, wherein the first glass layer and the second glass layer each contain 0 to 0.4% of SiO 2 in terms of mass percentage on an oxide basis. ２ 70 to 74%, Al２ O ３ 0-3%, MgO 3.3-6%, CaO 6.5-9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ 17. The insulating glass unit according to claim 14, wherein the first glass layer, the second glass layer, and the third glass layer are made of glass containing 0 to 0.4% of SiO, calculated in terms of mass percentage on an oxide basis. ２ 18. The insulated glass unit according to claim 14, wherein the absolute value of the difference in the content of Al is 1 to 9%. ２ O ３ 19. The insulated glass unit according to claim 14, wherein the absolute value of the difference in the content of Na, calculated in terms of mass percentage on an oxide basis, is 0.5 to 8.6%. ２ The absolute value of the difference in the content of O and SiO ２ 15. The insulated glass unit according to claim 14, wherein the sum of the absolute values ​​of the differences in the contents of the third glass layer and the second glass layer is 1.0 to 15%. 20. The insulated glass unit according to claim 1 or 2, wherein the thermal expansion coefficient of the third glass layer is greater than the thermal expansion coefficients of the first glass layer and the second glass layer. 21. The insulated glass unit according to claim 5, wherein the thermal expansion coefficient of the first shatterproof film is greater than the thermal expansion coefficient of the second shatterproof film. 22. The insulated glass unit according to claim 13, wherein the first adhesive layer and the second adhesive layer are formed from an acrylic coating composition containing an acrylic polymer as a base polymer.

[0008] According to the insulating glass unit of the present disclosure, even if the unit is broken, glass fragments are less likely to scatter or are very small, thereby improving safety for the user against injury.

[0009] 1 is a cross-sectional view schematically showing an insulating glass unit of a first embodiment; 2 is a cross-sectional view schematically showing an insulating glass unit of a second embodiment; 3 is a cross-sectional view schematically showing an insulating glass unit of a third embodiment; 4 is a cross-sectional view schematically showing an insulating glass unit of a fourth embodiment.

[0010] In this specification, a numerical range indicated using "to" means a range that includes the numerical values ​​before and after "to" as the minimum and maximum values, respectively.

[0011] The present invention will be described below based on an embodiment with reference to the drawings, but the present invention is not limited to this embodiment.

[0012] First Embodiment Fig. 1 is a cross-sectional view schematically illustrating an insulating glass unit 100 according to a first embodiment. The insulating glass unit 100 of this embodiment includes a first glass layer 10, a second glass layer 20, and a third glass layer 30. The first glass layer 10, the second glass layer 20, and the third glass layer 30 are each a sheet of glass having a predetermined thickness, such as a flat glass sheet or a glass sheet obtained by bending a flat sheet. In this embodiment, the sheet surface of the sheet of glass is referred to as a "main surface," and this same applies to other embodiments described below.

[0013] In the insulating glass unit 100, the first glass layer 10, the second glass layer 20, and the third glass layer 30 are arranged with their main surfaces substantially parallel and spaced apart, and the third glass layer 30 is disposed between the first glass layer 10 and the second glass layer 20. The peripheries of the first glass layer 10, the second glass layer 20, and the third glass layer 30 are hermetically sealed by a sealant 26 made of a polymer seal such as silicone rubber or other sealing material. In the insulating glass unit 100, the space defined between the first glass layer 10 and the third glass layer 30 is a first space 15, and the space defined between the second glass layer 20 and the third glass layer 30 is a second space 25.

[0014] Insulating glass unit 100, shatterproof film 24 is provided on the main surface of third glass layer 30 facing second glass layer 20. Shatterproof film 24 has a base material and an adhesive layer (not shown), and is attached to the main surface of third glass layer 30 by the adhesive layer.

[0015] The shatterproof film 24 adheres to glass fragments and prevents them from scattering when the insulating glass unit 100 is broken. This prevents injury to the user from glass fragments even if the insulating glass unit 100 is broken by an impact. Furthermore, by providing the shatterproof film 24 on the third glass layer 30, which is located between the three glass layers in the insulating glass unit 100, scattering of glass fragments upon breakage can be prevented without physically strengthening the third glass layer 30. This allows the thickness of the third glass layer 30 to be reduced, leading to a thinner and lighter insulating glass unit 100.

[0016] As described above, the shatterproof film 24 adheres glass fragments to prevent them from scattering. Therefore, it is preferable that the shatterproof film 24 satisfy ANSI Z97.1-2015, which defines the safety performance specifications and test methods for safety glass materials used in buildings. In particular, it is preferable that the shatterproof film 24 satisfy Type 1 of ANSI Z97.1-2015, 5.1.4. Specifically, it is preferable that the film satisfy the following condition: "The total weight of the peeled glass is equal to or less than 15.5 square inches of the original glass, and the weight of the largest piece of glass is equal to or less than 6.82 square inches of the original glass, excluding glass pieces weighing less than 1 square inch (when a shot back test is performed using 1930 x 864 mm glass)." The thickness of the shatterproof film 24 is, for example, preferably 50 μm to 3200 μm, more preferably 50 μm to 2000 μm, even more preferably 50 μm to 1000 μm, still more preferably 50 μm to 250 μm, particularly preferably 70 μm to 220 μm, and most preferably 90 μm to 200 μm.

[0017] In the insulating glass unit 100, the glass compositions of the three glass layers, the first glass layer 10, the second glass layer 20, and the third glass layer 30, may be the same or different. It is preferable that the glass compositions of the first glass layer 10 and the second glass layer 20 are the same. In this case, it is preferable that the glass composition of the third glass layer 30 is different from those of the first glass layer 10 and the second glass layer 20.

[0018] Furthermore, at least one of the first glass layer 10 and the second glass layer 20, which are located on the outside of the three glass layers, is preferably made of physically strengthened glass (physically strengthened glass), and more preferably, both the first glass layer 10 and the second glass layer 20 are made of physically strengthened glass. Physically strengthened glass tends to break into finer glass fragments when broken by impact, making it less likely to produce sharp glass fragments. Therefore, using physically strengthened glass can reduce user injuries caused by sharp glass fragments. For example, after forming into a glass sheet according to the embodiment described below, the glass sheet can be physically strengthened by rapidly cooling it from a high temperature near the softening point of the glass sheet. Preferably, the insulating glass unit 100 uses such a physically strengthened glass sheet for at least one of the first glass layer 10 and the second glass layer 20.

[0019] In the insulating glass unit 100, the third glass layer 30 preferably has a larger thermal expansion coefficient than the first glass layer 10 and the second glass layer 20. By increasing the thermal expansion coefficient of the third glass layer 30, which is located in the center of the three glass layers, even when deformation occurs in the outer glass layers of the insulating glass unit due to fluctuations in the gas pressure of the insulating gas or environmental temperature, the third glass layer 30 can follow these deformations, making the third glass layer 30 less likely to break.

[0020] As will be described later, particularly when the thickness of the central third glass layer 30 is made thinner than the outer first glass layer 10 and second glass layer 20, the effect of suppressing breakage of the third glass layer 30 can be significantly achieved by increasing the thermal expansion coefficient of the third glass layer 30. In this case, the thermal expansion coefficient of the third glass layer 30 is preferably 30×10－７ ~120 x 10 －７ °C, and more preferably 70 × 10 －７ ~110 x 10 －７ °C, more preferably 80 × 10 －７ ~100 x 10 －７ ° C. The absolute value of the difference between the thermal expansion coefficient of the first glass layer 10 or the second glass layer 20 and the thermal expansion coefficient of the third glass layer is preferably 1×10 －７ ~20 x 10 －７ °C, more preferably 1 × 10 －７ ~15 x 10 －７ °C, more preferably 2 × 10 －７ ~5 x 10 －７ °C. The thermal expansion coefficient of the glass layer is a value in the range of 50°C to 350°C, and can be measured using a differential scanning calorimeter (DSC).

[0021] The thickness of each glass layer may be the same or different in the insulating glass unit 100. Preferably, the first glass layer 10 and the second glass layer 20 have approximately the same thickness, and the third glass layer 30 has a smaller thickness.

[0022] When the first glass layer 10 and the second glass layer 20 have substantially the same thickness and the third glass layer 30 has a smaller thickness, the thicknesses of the first glass layer 10 and the second glass layer 20 are preferably 1.6 mm to 6.0 mm, more preferably 2.0 mm to 5.0 mm, and even more preferably 2.5 mm to 4.5 mm. Having a thickness of 1.6 mm or more for the first glass layer 10 and the second glass layer 20 provides a sufficient thickness for physical strengthening, which makes it easier to achieve the effect of reducing injury to the user when the glass layer breaks. Having a thickness of 6.0 mm or less for the first glass layer 10 and the second glass layer 20 allows for the weight of the insulating glass unit 100 to be reduced.

[0023] Furthermore, when the first glass layer 10 and the second glass layer 20 have substantially the same thickness and the third glass layer 30 has a smaller thickness, the thickness of the third glass layer 30 is preferably 0.4 mm to 2.0 mm, more preferably 0.5 mm to 1.6 mm, and even more preferably 0.6 mm to 1.3 mm. As described above, the third glass layer 30 has a shatterproof film on at least one of its main surfaces, so the thickness can be 2.0 mm or less. This contributes to reducing the weight of the insulating glass unit 100. Furthermore, having a thickness of 0.4 mm or more for the third glass layer 30 makes it less susceptible to breakage, contributing to preventing the insulating glass unit 100 from breaking.

[0024] Furthermore, when the first glass layer 10 and the second glass layer 20 have substantially the same thickness and the third glass layer 30 has a smaller thickness, the ratio "thickness of the third glass layer 30 / thickness of the first glass layer 10 (or the second glass layer 20)" is preferably 0.1 to 0.6, more preferably 0.15 to 0.5, and even more preferably 0.2 to 0.4. Having this ratio of 0.1 or more allows the third glass layer 30 to have a sufficient thickness, making the insulation unit 100 less likely to break. Having this ratio of 0.6 or less allows the thickness of the third glass layer 30 to be relatively small, which is advantageous for reducing the size and weight of the insulation unit 100.

[0025] In the insulating glass unit 100, at least one of the first space 15 and the second space 25 is preferably filled with a gas containing an insulating gas. Examples of insulating gases include nitrogen, helium, neon, argon, krypton, and xenon. One of these may be used alone, or two or more may be used in combination. The gas other than the insulating gas contained in the gas mixture may be, for example, air, or a mixture of an insulating gas and air may be used. It is preferable to fill both the first space 15 and the second space 25 with gas, thereby improving thermal insulation. When both the first space 15 and the second space 25 are filled with gas, the gas pressures in the two spaces may be the same or different.

[0026] The thicknesses of the first space 15 and the second space 25 (the distance between the glass layers) can be determined depending on the structure of the insulating glass unit 100 and may be, for example, 6 mm to 16 mm, 8 mm to 14 mm, or 9 mm to 13 mm. The thicknesses of the first space 15 and the second space 25 may be the same or different. The overall thickness of the insulating glass unit 100 is the sum of the thicknesses of all the glass layers and the thicknesses of the spaces between the glass layers, and may be about 60 mm or less, about 56 mm or less, about 54 mm or less, about 50 mm or less, about 40 mm or less, about 30 mm or less, or about 26 mm or less.

[0027] Second Embodiment Figure 2 is a cross-sectional view schematically illustrating an insulating glass unit 200 according to a second embodiment. The insulating glass unit 200 differs from the insulating glass unit 100 according to the first embodiment in that shatterproof films are provided on both sides of the third glass layer 30. However, the other configuration is similar to that of the insulating glass unit 100 according to the first embodiment. Therefore, components common to the insulating glass unit 100 according to the first embodiment are designated by the same reference numerals, and detailed descriptions thereof will be omitted.

[0028] The insulating glass unit 200 of the second embodiment includes a first shatterproof film 28 and a second shatterproof film 24. The first shatterproof film 28 is provided on a main surface of the third glass layer 30 facing the first space 15 and is in contact with the first space 15. The second shatterproof film 24 is provided on a main surface of the third glass layer 30 facing the second space 25 and is in contact with the second space 25. The first shatterproof film 28 and the second shatterproof film 24 are attached to the glass layers by a first adhesive layer and a second adhesive layer (not shown), respectively.

[0029] The insulating glass unit 200 of the second embodiment has shatterproof films on both sides of the third glass layer 30, which can prevent glass fragments from scattering when the unit is broken and can also prevent warping of the third glass layer 30. In order to prevent warping of the third glass layer 30, it is preferable that the thermal expansion coefficients of the first shatterproof film 28 and the second shatterproof film 24 are close to the thermal expansion coefficient of the third glass layer 30.

[0030] In the insulating glass unit 200 of the second embodiment, the thermal expansion coefficient of the first shatterproof film 28 is preferably greater than the thermal expansion coefficient of the second shatterproof film 24. The difference in the thermal expansion coefficients of the first shatterproof film 28 and the second shatterproof film 24 further reduces warping of the third glass layer 30 due to temperature changes, which leads to reduced breakage of the third glass layer 30.

[0031] In the insulating glass unit 200 of the second embodiment, it is preferable that the film thickness of the first shatterproof film 28 be greater than the film thickness of the second shatterproof film 24. This allows the direction of scattering of glass fragments when the glass layer is broken and the fragments scatter can be deflected toward the thinner shatterproof film 24. Therefore, when incorporating the insulating glass unit 100 into a building or an automobile, for example, the deflection of glass fragments can be controlled and safety can be improved by positioning the insulating glass unit 100 with consideration given to the deflection of glass fragments scattering.

[0032] In this case, the film thickness of the first shatterproof film 28 is preferably 110 μm to 250 μm, more preferably 120 μm to 230 μm, and even more preferably 150 μm to 210 μm, and the film thickness of the second shatterproof film 24 is preferably 50 μm to 100 μm, more preferably 60 μm to 90 μm, and even more preferably 60 μm to 80 μm.

[0033] Furthermore, in the insulating glass unit 200 of the second embodiment, the strength of the first shatterproof film 28 is preferably greater than the strength of the second shatterproof film 24. The strength of the first adhesive layer is also preferably greater than the strength of the second adhesive layer. In these cases, as described above, the scattering direction of glass fragments can be deflected toward the thinner shatterproof film 24, thereby improving safety. The strength of the shatterproof film can be evaluated, for example, by tensile strength measured with a tensile tester. The strength of the adhesive layer can be evaluated by strength measured in accordance with JIS A 5759 2016.

[0034] The tensile strength of the first shatterproof film 28 is preferably 100 N to 1200 N, more preferably 120 N to 1100 N, and even more preferably 150 N to 800 N, and the tensile strength of the second shatterproof film 24 is preferably 100 N to 1200 N, more preferably 120 N to 1100 N, and even more preferably 150 N to 800 N. Furthermore, the adhesive strength of the first adhesive layer is preferably 10 N to 40 N, more preferably 12 N to 35 N, and even more preferably 13 N to 30 N, and the adhesive strength of the second adhesive layer is preferably 10 N to 40 N, more preferably 12 N to 35 N, and even more preferably 13 N to 30 N.

[0035] Third Embodiment Figure 3 is a cross-sectional view schematically illustrating an insulating glass unit 300 according to a third embodiment. The insulating glass unit 300 differs from the insulating glass unit 100 of the first embodiment in that the third glass layer 30 has a shatterproof film 24 on the main surface thereof facing the second glass layer 20, and the first glass layer 10 has a shatterproof film 22 on the main surface thereof facing the third glass layer 30. However, the rest of the configuration is the same as that of the insulating glass unit 100 of the first embodiment. Therefore, components common to the insulating glass unit 100 of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0036] In the insulating glass unit 300, the first glass layer 10 and the third glass layer 30 are provided with shatterproof films, but the second glass layer 20 is not provided with a shatterproof film, so it is preferable to use physically strengthened glass as the second glass layer 20. This can prevent glass fragments from scattering or prevent the generation of sharp glass fragments even if the insulating glass unit 300 is broken.

[0037] Fourth Embodiment Figure 4 is a cross-sectional view schematically illustrating an insulating glass unit 400 of a fourth embodiment. The insulating glass unit 300 is different from the insulating glass unit 100 of the first embodiment in that the first glass layer 10 has a shatterproof film 22 on the main surface facing the third glass layer 30, the second glass layer 20 has a shatterproof film 23 on the main surface facing the third glass layer 30, and the third glass layer 30 does not have a shatterproof film. However, the other configuration is similar to that of the insulating glass unit 100 of the first embodiment. Therefore, components common to the insulating glass unit 100 of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0038] In the insulating glass unit 400, the first glass layer 10 and the second glass layer 20 are provided with shatterproof films, and either glass layer may or may not be physically strengthened. Even if the insulating glass unit 400 is broken, the shatterproof films prevent glass fragments from the first glass layer 10 and the second glass layer 20 from scattering. Furthermore, the two shatterproof films make it easy to confine glass fragments from the third glass layer 30 in the space between the first glass layer 10 and the second glass layer 20, thereby preventing the glass fragments from scattering.

[0039] (Shatterproof Film) Next, the configuration of the shatterproof film will be described. The shatterproof film 24 of the insulating glass unit 100 of the first embodiment described above has a resin substrate and an adhesive layer provided on one surface of the resin substrate. Examples of resin substrates include acrylic, polycarbonate, styrene, polyester, polyolefin, hydrogenated cyclic resin, fluorine-based, silicone, and urethane-based resins. Among these, the resin substrate is preferably a polyester-based resin, and more preferably a polyethylene terephthalate (PET) resin.

[0040] In the shatterproof film 24, the adhesive layer is formed from a coating composition containing an acrylic polymer as a base polymer. The coating composition is applied to one surface of the substrate by coating with a coater such as a die coater or a spray coater, by roller coating, dip coating, or the like, and then dried at, for example, about 40°C to 60°C, thereby obtaining an adhesive layer.

[0041] Here, "acrylic polymer" refers to a polymer of monomer components containing at least one monomer selected from the group consisting of a monomer having at least one (meth)acryloyl group in one molecule and (meth)acrylonitrile. Hereinafter, monomers having at least one (meth)acryloyl group in one molecule and (meth)acrylonitrile are collectively referred to as "acrylic monomers." An acrylic polymer is defined as a polymer containing monomer units derived from an acrylic monomer. A typical example of an acrylic polymer is a polymer in which the proportion of acrylic monomers in the monomer components constituting the acrylic polymer is greater than 50% by mass (preferably greater than 70% by mass, for example greater than 90% by mass).

[0042] The adhesive layer can be formed using, for example, a coating composition containing an acrylic polymer as a base polymer, as disclosed in Japanese Patent Application Laid-Open No. 2022-176898.

[0043] The shatterproof film 24 may further have a hard coat layer on the surface of the substrate opposite the adhesive layer, which is obtained by curing an active energy ray-curable resin such as an acrylic resin, a silicone resin, a urethane resin, an olefin resin, an ester resin, etc. The hard coat layer can impart hardness and scratch resistance to the surface of the shatterproof film.

[0044] In this specification, the term "shatterproof film" refers to a film that prevents glass or other brittle materials from scattering when broken. Specifically, it refers to a film that meets the standards for Organic Coated Glazing Type 1 in the impact test specified in ASNSI Z97.1-2015.

[0045] Although the shatterproof film 24 of the insulating glass unit 100 of the first embodiment has been described above, the same applies to the shatterproof films of the insulating glass units of the other embodiments.

[0046] (Glass Composition) Next, a description will be given of the glass composition constituting the first glass layer 10, the second glass layer 20, and the third glass layer 30. In the insulating glass unit 100 of the first embodiment, the first glass layer 10, the second glass layer 20, and the third glass layer 30 are made of soda-lime glass, alkaline earth aluminoborosilicate glass, alkali-free aluminoborosilicate glass, or the like, and soda-lime glass is preferred in terms of ease of processing.

[0047] The soda lime glass forming the first glass layer 10, the second glass layer 20, and the third glass layer 30 contains SiO 2 in terms of mass percentage based on oxides. ２ 65 to 74%, Al ２ O ３ 0 to 8.6%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ Glass A having the above composition has sufficient strength for forming an insulating glass unit, and the thermal expansion coefficient is easily controlled.

[0048] Next, the effects of the components contained in the glass of this embodiment (glass A) will be described below. ２ is known as a component that forms a network structure in the glass microstructure, and is a major component that constitutes glass. ２ The content of SiO is preferably 65% ​​or more, more preferably 66% or more, even more preferably 66.5% or more, and particularly preferably 67% or more. ２The content of SiO is preferably 74% or less, more preferably 72% or less, even more preferably 71.5% or less, and particularly preferably 71% or less. ２ When the content is 65% or more, the glass is advantageous in terms of stability and weather resistance. ２ When the content is 72% or less, it is advantageous in terms of meltability and moldability.

[0049] Al ２ O ３ is a component that improves the weather resistance of glass. When glass is shaped by the float method, it also has the effect of suppressing the penetration of tin from the bottom surface during float forming. ２ The Al content in glass A has the effect of promoting dealkalization when the treatment is carried out. ２ O ３ The content of Al is preferably 0% or more, more preferably 1.0% or more, even more preferably 3.8% or more, and particularly preferably 4.2% or more. ２ O ３ The Al content is preferably 8.6% or less, more preferably 8.0% or less, even more preferably 7.5% or less, and particularly preferably 7.0% or less. ２ O ３ When the content of Al is 1.0% or more, weather resistance can be improved. ２ O ３ When the content is 8.6% or less, the increase in the devitrification temperature is suppressed even when the viscosity of the glass is high, which is advantageous in terms of melting and forming in a soda-lime glass production line.

[0050] Al ２ O ３ and Na ２ Focusing on the two components Al and O, they have opposing effects on high-temperature viscosity, devitrification temperature, and the amount of tin penetration from the bottom surface. ２ O ３ and Na ２ It is preferable that O is contained in a specific ratio, and from the viewpoint of reducing the amount of tin penetration during float forming, Na ２ O / Al ２ O ３is preferably 5 or less, more preferably 4.5 or less, and even more preferably 4 or less. On the other hand, from the viewpoint of suppressing an increase in high-temperature viscosity and devitrification temperature, Na ２ O / Al ２ O ３ is preferably 1.8 or more, more preferably 2 or more, and even more preferably 2.4 or more.

[0051] In this embodiment, from the viewpoint of reducing the amount of tin penetration during float forming, (Na ２ O+K ２ O) / Al ２ O ３ The ratio is preferably 2.2 or more, more preferably 2.3 or more, and further preferably 2.4 or more. In addition, from the viewpoint of suppressing an increase in high-temperature viscosity and devitrification temperature, (Na ２ O+K ２ O) / Al ２ O ３ The ratio is preferably 4 or less, more preferably 3.5 or less, and even more preferably 3 or less.

[0052] MgO is an essential component that stabilizes the glass. The MgO content is preferably 3.3% or more, more preferably 3.6% or more, and even more preferably 3.9% or more. The MgO content is preferably 6% or less, more preferably 5.7% or less, and even more preferably 5.4% or less. When the MgO content is 3.3% or more, the meltability at high temperatures is improved and devitrification is less likely to occur. On the other hand, when the MgO content is 6% or less, the resistance to devitrification is maintained and a sufficient ion exchange rate is obtained.

[0053] CaO is an essential component that stabilizes the glass. The CaO content is preferably 6.5% or more, more preferably 6.7% or more, and even more preferably 6.9% or more. The CaO content is preferably 9.0% or less, more preferably 8.5% or less, and even more preferably 8.2% or less. When the CaO content is 6.5% or more, the meltability at high temperatures is improved and devitrification is less likely to occur. On the other hand, when the CaO content is 9.0% or less, the high-temperature viscosity does not decrease too much, and a high liquidus viscosity is easily ensured.

[0054] Na ２ O is a component that lowers the high-temperature viscosity and devitrification temperature of the glass and improves the meltability and formability of the glass. ２ O is a component that generates non-bridge oxygen (NBO), which reduces fluctuations in chemical strengthening properties when the water content in the glass changes. ２ The content of O is preferably 13% or more, more preferably 13.4% or more, and further preferably 13.8% or more. ２ The O content is preferably 16% or less, more preferably 15.6% or less, and further preferably 15.2% or less. ２ When the O content is 13% or more, a desired surface compressive stress layer can be formed by ion exchange, and fluctuations due to changes in the water content can be suppressed. ２ When the O content is 16% or less, sufficient weather resistance is obtained, and the amount of tin that penetrates from the bottom surface during float forming can be suppressed.

[0055] K ２ O is a component that increases non-bridging oxygen and lowers the softening point, but if it is too much, it becomes difficult to ensure a high liquidus viscosity. ２ When O is contained, it is preferably 1.0% or less, more preferably 0.8% or less, and further preferably 0.6% or less. ２ O has the effect of suppressing the penetration of tin from the bottom surface during float forming, so it is preferable to include O during float forming. ２ The O content is preferably 0.05% or more, and more preferably 0.1% or more.

[0056] Al ２ O ３ is a component that increases high-temperature viscosity and devitrification temperature, and Na ２ O and K ２ O is a component that reduces high-temperature viscosity and devitrification temperature. ２ O ３ is a component that reduces non-bridging oxygen, but Na ２ O and K ２O is a component that increases the water content, which is preferable for stable production of glass, sufficient narrowing, and obtaining stable chemical strengthening properties against changes in water content.

[0057] TiO ２ is present in large amounts in natural materials and is the source of yellow color. ２ The content of TiO is preferably 0.2% or less, more preferably 0.13% or less, and further preferably 0.1% or less. ２ By keeping the content of 0.2% or less, yellowing of the glass can be suppressed.

[0058] Fe ２ O ３ is a component that exists everywhere in nature and in production lines, and it is difficult to reduce its content to zero. ２ O ３ causes yellow coloring, and FeO in a reduced state causes blue coloring, and the balance between the two causes the glass to be colored green. ２ When O is contained, it is preferably 0% or more, more preferably 0.01% or more, further preferably 0.03% or more, and particularly preferably 0.05% or more. ２ The O content is preferably 0.15% or less, more preferably 0.12% or less, and further preferably 0.10% or less.

[0059] SO ３ is a fining agent for glass melting. Usually, the content in glass is less than half of the amount added from the raw materials. ３ When SO is contained, its content is preferably 0% or more, more preferably 0.02% or more, further preferably 0.05% or more, and particularly preferably 0.1% or more. ３ The content of SO is preferably 0.4% or less, more preferably 0.35% or less, and further preferably 0.3% or less. ３ When the content of SO is 0.02% or more, the refinement is sufficient and foam defects can be suppressed. ３When the content is 0.4% or less, defects of sodium sulfate occurring in the glass can be suppressed.

[0060] In addition, chlorides, fluorides, etc. may be appropriately contained as fining agents for the glass melt. The glass of the present invention essentially consists of the components described above, but may contain other components within a range that does not impair the object of the present invention. When such components are contained, the total content of these components is preferably 5% or less, more preferably 3% or less, and typically 1% or less.

[0061] Glass A can be produced by known glass forming methods such as the float process, the fusion process, the slot downdraw process, etc. When produced by the float process, Glass A has the advantage that its properties change little even when it comes into contact with molten tin.

[0062] In one aspect of the insulating glass unit 100 of the above-described embodiment, when the first glass layer 10 and the second glass layer 20 have the same glass composition and the first glass layer 10 and the third glass layer 30 have a different glass composition, the first glass layer 10 and the second glass layer 20 each contain SiO 2 in glass A expressed as an oxide-based mass percentage. ２ 70 to 74%, Al ２ O ３ 0 to 3.0%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ In this case, the third glass layer 30 is preferably made of glass containing 0 to 0.4% of SiO 2 in terms of mass percentage based on oxides in glass A (hereinafter also referred to as “glass B”). ２ 65 to 72%, Al ２ O ３Preferably, the insulating glass unit 100 is made of a glass containing 3.4 to 8.6% of methyl methacrylate (hereinafter also referred to as "glass C"). By combining glass B and glass C, it is easy to make the thermal expansion coefficient of the third glass layer 30 larger than the thermal expansion coefficients of the first glass layer 10 and the second glass layer 20, which has the effect of making the insulating glass unit 100 less likely to break.

[0063] In one aspect of the present embodiment, in the insulating glass unit 100, the thermal expansion coefficient of the third glass layer 30 is made larger than the thermal expansion coefficients of the first glass layer 10 and the second glass layer 20. The first glass layer 10, the second glass layer 20, and the third glass layer 30 are each made of a material selected from the group consisting of Na, Na+, Na2O, Na+ ... ２ The absolute value of the difference in the O content is preferably 0.5 to 10 mass %, more preferably 0.7 to 8 mass %, and even more preferably 0.9 to 7 mass %.

[0064] In one aspect of the present embodiment, in the insulating glass unit 100, the thermal expansion coefficient of the third glass layer 30 is made larger than the thermal expansion coefficients of the first glass layer 10 and the second glass layer 20. The first glass layer 10, the second glass layer 20, and the third glass layer 30 are each made of a material selected from the group consisting of Na, Na+, Na2O, Na+ ... ２ The absolute value of the difference in the content of O and SiO ２ The sum of the absolute values ​​of the differences in the contents of the above is preferably 1.0 to 15% by mass, more preferably 1.5 to 12% by mass, and even more preferably 2.0 to 10% by mass.

[0065] In one aspect of this embodiment, the first glass layer 10, the second glass layer 20, and the third glass layer 30 each contain Al, calculated in terms of mass percentage on an oxide basis. ２ O ３ In this embodiment, the absolute value of the difference in the content of SiO 2 is preferably 0.5 to 8.6%, more preferably 0.6 to 8.5%, and further preferably 1.0 to 8.0%. ２The absolute value of the difference in the content of is preferably 1.0 to 9.0%, more preferably 1.5 to 8.5%, and even more preferably 2.0 to 8.0%.

[0066] Although the above embodiment describes an insulating glass unit having three glass layers, the insulating glass unit may have four or more glass layers. When the insulating glass unit has four or more glass layers, the preferred aspects of the outer two glass layers are the same as those of the first and second glass layers, respectively. Furthermore, at least one of the glass layers located between the two outer glass layers may be provided with a shatterproof film, and two or more glass layers may be provided with a shatterproof film. Furthermore, in an insulating glass unit having four or more glass layers, the glass layer located between the two outer glass layers (the first and second glass layers) preferably has the same aspect as that of the third glass layer in the above embodiment, and the preferred aspect of the shatterproof film is also the same as that of the shatterproof film provided on the main surface of the third glass layer.

[0067] Applications The insulating glass units of the above-described embodiments are highly safe for users because, if broken, they are less likely to shatter or the glass fragments are very small, making them suitable for a variety of applications, including windows, doors, or skylights in buildings, windows in automobiles and other vehicles, windows or display panels in electrical appliances, and display panels in electronic devices.

[0068] 1. An insulating glass unit comprising a first glass layer, a second glass layer, a third glass layer disposed between the first glass layer and the second glass layer, a first space defined between the first glass layer and the third glass layer, and a second space defined between the second glass layer and the third glass layer, wherein the insulating glass unit is provided with a shatterproof film on at least one major surface of the third glass layer. 2. The insulating glass unit according to item 1, wherein the shatterproof film has polyethylene terephthalate as a base material. 3. The insulating glass unit according to item 1 or 2, wherein the thickness of the third glass layer is 0.4 mm to 2.0 mm. 4. The insulating glass unit according to any one of items 1 to 3, wherein the thicknesses of the first glass layer and the second glass layer are 1.6 mm to 6.0 mm. 5. 5. The insulating glass unit according to any one of claims 1 to 4, wherein the third glass layer comprises: a first shatterproof film provided on a main surface of the third glass layer facing the first space and in contact with the first space; and a second shatterproof film provided on a main surface of the third glass layer facing the second space and in contact with the second space. 6. The insulating glass unit according to any one of claims 1 to 5, wherein the first glass layer, the second glass layer, and the third glass layer are made of soda-lime glass. 7. The soda-lime glass contains, in terms of mass percentage on an oxide basis, SiO ２ 65 to 74%, Al ２ O ３ 0 to 8.6%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ Contains 0 to 0.4% of (Na ２ O+K ２ O) / Al ２ O ３is 2.2 to 4. 8. The insulating glass unit according to any one of claims 1 to 7, wherein at least one of the first glass layer and the second glass layer is physically tempered glass. 9. The insulating glass unit according to any one of claims 1 to 8, wherein at least one of the first space and the second space is filled with an insulating gas or a mixed gas of an insulating gas and air. 10. The insulating glass unit according to claim 9, wherein the insulating gas includes at least one selected from nitrogen, helium, neon, argon, krypton, and xenon. 11. The insulating glass unit according to any one of claims 5 to 10, wherein the thickness of the first shatterproof film is greater than the thickness of the second shatterproof film. 12. The insulating glass unit according to any one of claims 5 to 11, wherein the strength of the first shatterproof film is greater than the strength of the second shatterproof film. 13. 13. The insulating glass unit according to any one of claims 5 to 12, wherein the first shatterproof film has a substrate and a first adhesive layer provided on the surface of the substrate facing the third glass layer, and the second shatterproof film has a substrate and a second adhesive layer provided on the surface of the substrate facing the third glass layer, and the strength of the first adhesive layer is greater than the strength of the second adhesive layer. 14. The insulating glass unit according to any one of claims 1 to 13, wherein the glass composition of the first glass layer and the second glass layer is different from the glass composition of the third glass layer. 15. The third glass layer contains, in terms of mass percentage on an oxide basis, SiO ２ 65 to 72%, Al ２ O ３ 3.4 to 8.6%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ 16. The insulated glass unit according to claim 14, wherein the first glass layer and the second glass layer each contain 0 to 0.4% of SiO 2 in terms of mass percentage on an oxide basis. ２ 70 to 74%, Al２ O ３ 0-3%, MgO 3.3-6%, CaO 6.5-9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ 17. The insulating glass unit according to claim 14, wherein the first glass layer, the second glass layer, and the third glass layer are made of glass containing 0 to 0.4% of SiO, calculated in terms of mass percentage on an oxide basis. ２ 17. The insulated glass unit according to any one of 14 to 16, wherein the absolute value of the difference in the content of Al is 1 to 9%. 18. The first glass layer, the second glass layer, and the third glass layer each contain Al, calculated in terms of mass percentage on an oxide basis. ２ O ３ 19. The insulated glass unit according to any one of 14 to 17, wherein the absolute value of the difference between the contents of Na, Na+ ... ２ The absolute value of the difference in the content of O and SiO ２ 19. The insulated glass unit according to any one of paragraphs 14 to 18, wherein the sum of the absolute values ​​of the differences in the contents of the third glass layer and the second glass layer is 1.0 to 15%. 20. The insulated glass unit according to any one of paragraphs 1 to 19, wherein the thermal expansion coefficient of the third glass layer is greater than the thermal expansion coefficients of the first glass layer and the second glass layer. 21. The insulated glass unit according to any one of paragraphs 5 to 20, wherein the thermal expansion coefficient of the first shatterproof film is greater than the thermal expansion coefficient of the second shatterproof film. 22. The insulated glass unit according to any one of paragraphs 13 to 21, wherein the first adhesive layer and the second adhesive layer are formed from an acrylic coating composition containing an acrylic polymer as a base polymer.

[0069] Although the present invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. This application is based on a Japanese patent application (Patent Application No. 2024-091424) filed on June 5, 2024, the entirety of which is incorporated by reference. All references cited herein are incorporated in their entirety.

[0070] 100, 200, 300, 400...insulating glass unit, 10...first glass layer, 20...second glass layer, 30...third glass layer, 15...first space, 25...second space, 26...sealing material, 22, 23, 24, 28...shatterproof film

Claims

1. An insulated glass unit comprising: a first glass layer; a second glass layer; a third glass layer disposed between the first and second glass layers; a first space defined between the first and third glass layers; and a second space defined between the second and third glass layers, wherein the insulated glass unit is provided with a shatterproof film on at least one major surface of the third glass layer.

2. The insulated glass unit of claim 1, wherein the shatterproof film has a polyethylene terephthalate substrate.

3. The insulated glass unit of claim 1 or 2, wherein the thickness of the third glass layer is 0.4 mm to 2.0 mm.

4. The insulated glass unit according to claim 1 or 2, wherein the thickness of the first glass layer and the second glass layer is 1.6 mm to 6.0 mm.

5. An insulated glass unit as described in claim 1 or 2, wherein the third glass layer comprises: a first shatterproof film provided on a main surface of the third glass layer facing the first space and in contact with the first space; and a second shatterproof film provided on a main surface of the third glass layer facing the second space and in contact with the second space.

6. The insulated glass unit of claim 1 or 2, wherein the first glass layer, the second glass layer, and the third glass layer are made of soda-lime glass.

7. The soda lime glass contains, in terms of mass percentage based on oxide, SiO ２ 65 to 74%, Al ２ O ３ 0 to 8.6%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ Contains 0 to 0.4% of (Na ２ O+K ２ O) / Al ２ O ３ The insulated glass unit of claim 6, wherein the .lambda.

8. The insulated glass unit of claim 1 or 2, wherein at least one of the first glass layer and the second glass layer is physically strengthened glass.

9. The insulated glass unit according to claim 1 or 2, wherein at least one of the first space and the second space is filled with an insulating gas or a mixture of an insulating gas and air.

10. The insulated glass unit of claim 9, wherein the insulating gas comprises at least one selected from nitrogen, helium, neon, argon, krypton, and xenon.

11. The insulated glass unit of claim 5, wherein the thickness of the first shatterproof film is greater than the thickness of the second shatterproof film.

12. The insulated glass unit of claim 5, wherein the strength of the first shatterproof film is greater than the strength of the second shatterproof film.

13. The insulated glass unit of claim 5, wherein the first shatterproof film has a substrate and a first adhesive layer provided on the surface of the substrate facing the third glass layer, and the second shatterproof film has a substrate and a second adhesive layer provided on the surface of the substrate facing the third glass layer, and the strength of the first adhesive layer is greater than the strength of the second adhesive layer.

14. The insulated glass unit of claim 1 or 2, wherein the glass compositions of the first and second glass layers are different from the glass composition of the third glass layer.

15. The third glass layer contains SiO in terms of mass percentage on an oxide basis. ２ 65 to 72%, Al ２ O ３ 3.4 to 8.6%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ 15. The insulated glass unit according to claim 14, comprising glass containing 0 to 0.4% of 16. The first glass layer and the second glass layer each contain SiO in terms of mass percentage on an oxide basis. ２ 70 to 74%, Al ２ O ３ 0 to 3.0%, MgO 3.3 to 6%, CaO 6.5 to 9%, Na ２ O 13-16%, K ２ 0-1% O, TiO ２ 0 to 0.2%, Fe ２ O ３ 0 to 0.15%, SO ３ 15. The insulated glass unit according to claim 14, comprising glass containing 0 to 0.4% of 17. The first glass layer, the second glass layer, and the third glass layer contain SiO calculated in terms of mass percentage on an oxide basis. ２ 15. The insulated glass unit of claim 14, wherein the absolute value of the difference in content is 1.0 to 9.0%.

18. The first glass layer, the second glass layer, and the third glass layer are each calculated in terms of mass percentage on an oxide basis. ２ O ３ 15. The insulated glass unit of claim 14, wherein the absolute value of the difference in content is 0.5 to 8.6%.

19. The first glass layer, the second glass layer, and the third glass layer contain Na, calculated in mass percentage on an oxide basis. ２ The absolute value of the difference in the content of O and SiO ２ 15. The insulated glass unit of claim 14, wherein the sum of the absolute values ​​of the differences in the contents of is 1.0 to 15%.

20. The insulated glass unit of claim 1 or 2, wherein the coefficient of thermal expansion of the third glass layer is greater than the coefficients of thermal expansion of the first glass layer and the second glass layer.

21. The insulated glass unit of claim 5, wherein the coefficient of thermal expansion of the first shatterproof film is greater than the coefficient of thermal expansion of the second shatterproof film.

22. The insulated glass unit of claim 13, wherein the first adhesive layer and the second adhesive layer are formed from an acrylic coating composition containing an acrylic polymer as a base polymer.

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