Glass, window glass for vehicle, window glass for building, glass for sensor, and laminated glass

Abstract

The purpose of the present invention is to provide a glass and a laminated glass, which can be used for various applications even after undergoing changes in optical properties caused by sunlight solarization. A glass containing, in mass percentage based on oxides, at least 50% of SiO2, at least 0.10% of Al2O3, 0.0010-0.10% in total of bismuth oxide (t-Bi2O3) in terms of Bi2O2, and 0.0010-0.10% in total of copper oxide (t-CuO) in terms of CuO.

Description

Glass, vehicle window glass, architectural window glass, sensor glass, and laminated glass

[0001] The present invention relates to glass, vehicle glazing, architectural glazing, sensor glazing, and laminated glass.

[0002] Glass used in applications such as vehicles, buildings, and sensors is used in a variety of environments and may be constantly exposed to sunlight. Irradiation with sunlight causes solarization, which changes the valence of the components in the glass, resulting in changes in optical properties.

[0003] Changes in the optical properties of glass can cause changes in the color of the glass and the transmittance of wavelengths required for sensors, making it impossible to obtain the desired properties. Attempts have been made to set the composition of glass within a specific range in order to suppress solarization caused by sunlight (see, for example, Patent Documents 1 to 5).

[0004] Patent Document 1 describes a method for making a plate thickness of 0.2 mm or less and using TiO ２ Patent Document 2 discloses a glass substrate for space solar power generation in which the content of SiO ２ component, RO component and Ln ２ O ３ The document discloses a glass having solarization resistance suitable for use as a concentrating lens for a concentrating solar cell device, the glass containing the components in a total content of 50% or more by mass on an oxide basis.

[0005] Patent Document 3 describes, in mass %, SiO ２ 50-85%, B ２ O ３ 0-30%, Al ２ O ３ 0-20% ZrO ２ 0-10% and Li ２ O + Na ２ O+K ２ O 0.1 to 15% and a thermal expansion coefficient of 80 × 10 at 30 to 300 ° C. －７ This publication discloses a glass for use in an optical element for a concentrating solar power generation device, which has a viscosity of 1000 ppm or less.

[0006] Patent Document 4 describes a method for producing a steel sheet containing less than 0.010% by weight of Fe. ２ O ３ total iron as a redox ratio of less than 0.350, less than 0.0025 wt.% CeO ２ and a soda-lime-silica glass for solar collector cover plates and solar mirrors having spectral properties including greater than 90% visible light transmittance and total solar infrared transmittance at a thickness of 5.5 millimeters and reduced solarization.

[0007] Patent Document 5 describes a method for producing a ferrous metal oxide containing iron oxide, Fe ２ O ３ Total iron oxide (Fe ２ O ３ ) is 0.001 mass % or more and 0.04 mass % or less, and TiO ２ The soda-lime glass composition contains 0.075% by mass or more and 0.5% by mass or less of total titanium oxide calculated as SiO 2 .

[0008] International Publication No. 2023 / 022074 Japanese Patent Application Publication No. 2010-116277 Japanese Patent Application Publication No. 2013-51225 Japanese Patent Application Publication No. 2012-509246 Japanese Patent Application Publication No. 2010-100440

[0009] As described above, solarization caused by sunlight changes the optical properties of glass, making it unsuitable for various applications. Therefore, there is a demand for glass that can be used for various applications even after undergoing this change in optical properties.

[0010] In view of the above problems, an object of the present invention is to provide glass and laminated glass that can be used in various applications even after undergoing changes in optical properties caused by solarization due to sunlight.

[0011] The present inventors have found that the above problems can be solved by using glass having a specific composition range, and have completed the present invention.

[0012] That is, the present invention is as follows: 1. In terms of mass percentage based on oxides, SiO ２ 50% or more, Al ２ O ３ 0.10% or more, Bi ２ O３ Total bismuth oxide (t-Bi ２ O ３ 2. Glass containing 0.0010% or more and 0.10% or less of SiO 2 , and 0.0010% or more and 0.10% or less of total copper oxide (t-CuO) converted to CuO. ２ :65~80%, Al ２ O ３ :0.10~7.0%, B ２ O ３ :0.0~5.0%, MgO:0.0~20%, CaO:0.0~20%, SrO:0.0~20%, BaO:0.0~20%, Li ２ O: 0.0-20%, Na ２ O: 0.0-20%, K ２ O: 0.0~20%, Fe ２ O ３ Total iron oxides converted to R': 0.050 to 5.0% ２ 1. The glass according to 1 above, containing O: 10 to 20%, and RO: 5.0 to 20% (wherein RO is the total content of MgO, CaO, SrO and BaO, and R' is the total content of MgO, CaO, SrO and BaO). ２ O is Li ２ O, Na ２ O and K ２ 3. Mass percentage based on oxides: SiO ２ :65~80%, Al ２ O ３ :0.10~7.0%, B ２ O ３ :5.0~20%, MgO:0.0~20%, CaO:0.0~20%, SrO:0.0~20%, BaO:0.0~20%, Li ２ O: 0.0-20%, Na ２ O: 0.0-20%, K ２ O: 0.0~20%, Fe ２ O ３ Total iron oxides converted to R': 0.0050 to 5.0% ２ 1. The glass according to 1 above, containing O: 5.0 to 20% and RO: 0.0 to 20% (wherein RO is the total content of MgO, CaO, SrO and BaO, and R'２ O is Li ２ O, Na ２ O and K ２ 4. The total content of SiO2 in terms of mass percentage based on oxides ２ : 75 to 85% Al ２ O ３ :0.10~5.0%B ２ O ３ :5.0~20% MgO:0.0~5.0% CaO:0.0~5.0% SrO:0.0~5.0% BaO:0.0~5.0% Li ２ O: 0.0-5.0% Na ２ O: 0.0-5.0% K ２ O: 0.0-5.0% Fe ２ O ３ Total iron oxide converted to: 0.0050 to 5.0% R' ２ 1. The glass according to 1 above, containing O: 1.0 to 5.0% and RO: 0.0 to 5.0% (wherein RO is the total content of MgO, CaO, SrO and BaO, and R' ２ O is Li ２ O, Na ２ O and K ２ 5. The total content of Fe, O, and Fe2O in terms of mass percentage based on oxides. ２ O ３ Total iron oxide (t-Fe ２ O ３ 6. The glass according to 1 above, containing, in mass percentage on an oxide basis, 0.010% or more and 0.10% or less of Fe. ２ O ３ Total iron oxide (t-Fe ２ O ３ 7. The glass according to 1 above, containing more than 0.10% and not more than 1.0% of Bi, expressed as a mass percentage based on oxides. ２ O ３ Total bismuth oxide (t-Bi ２ O ３8. The glass according to 1 above, containing 0.010% or more of copper oxide (t-CuO) calculated as CuO, and 0.0080% or more of total copper oxide (t-CuO). 9. The glass according to 1 above, having a ΔTv defined as follows: ΔTv: difference obtained by subtracting the visible light transmittance Tv of the glass sheet before irradiation from the visible light transmittance Tv of the glass sheet after 2 hours of irradiation with simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is a glass plate prepared by melting the glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 9. The glass according to 1 above, wherein, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 10 to 79%, ΔTuv defined below is −0.05% or less. ΔTuv: difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before irradiation from the ultraviolet transmittance Tuv of the glass plate after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is a glass plate prepared by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 10. The glass according to 1 above, wherein, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 80 to 93%, ΔTuv defined below is 0.10% or more. ΔTuv: difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before irradiation from the ultraviolet transmittance Tuv of the glass plate after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is a glass plate prepared by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 11. The glass according to 1 above, wherein, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 80 to 93%, ΔTuv defined below is −0.35% or less. ΔTuv: difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before irradiation from the ultraviolet transmittance Tuv of the glass plate after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２The glass plate is a glass plate prepared by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 12. ΔC defined as follows: ＊ 2. The glass according to 1 above, wherein the absolute value of ΔC is 0.07 or less. ＊ : Chroma C of the glass plate after 2 hours of irradiation with simulated sunlight ＊ From the above, the saturation C of the glass plate before the irradiation ＊ The pseudo-sunlight has an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is a glass plate prepared by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 13. The glass according to 1 above, which is physically strengthened glass or chemically strengthened glass. 14. A vehicle window glass comprising the glass according to any one of 1 to 13 above. 15. An architectural window glass comprising the glass according to any one of 1 to 13 above. 16. A glass for a sensor comprising the glass according to any one of 1 to 13 above. 17. A laminated glass comprising a first glass plate, a second glass plate, and an interlayer film sandwiched between the first glass plate and the second glass plate, wherein at least one of the first glass plate and the second glass plate is the glass according to any one of 1 to 13 above.

[0013] According to the present invention, it is possible to provide glass and laminated glass that can be used in various applications even after undergoing changes in optical properties caused by solarization due to sunlight.

[0014] Fig. 1 is a cross-sectional view of an example of laminated glass according to an embodiment of the present invention. Fig. 2 is a conceptual diagram showing a state in which laminated glass according to an embodiment of the present invention is used as a window glass for a vehicle. Fig. 3 is an enlarged view of part S in Fig. 2. Fig. 4 is a cross-sectional view taken along line Y-Y in Fig. 3.

[0015] Hereinafter, embodiments of the present invention will be described in detail. In the following drawings, components and parts that perform the same function may be denoted by the same reference numerals, and redundant explanations may be omitted or simplified. The embodiments shown in the drawings are schematic for the purpose of clearly explaining the present invention, and do not necessarily accurately represent the size or scale of the actual product. In this specification, numerical ranges indicated using "to" indicate ranges that include the numerical values ​​before and after "to" as the minimum and maximum values, respectively.

[0016] Hereinafter, the glass of this embodiment will be described as an embodiment of the glass of the present invention.

[0017] <Glass> [Glass Composition] Unless otherwise specified, the composition range of each component is expressed as a mass percentage based on the oxide. Furthermore, for each component, "substantially not contained" means that the component is not contained except as an unavoidable impurity mixed in from the raw materials, etc., that is, it is not intentionally contained.

[0018] The glass of the present embodiment contains, in terms of mass percentage based on oxides, SiO ２ 50% or more, Al ２ O ３ 0.10% or more, Bi ２ O ３ Total bismuth oxide (t-Bi ２ O ３ and a total copper oxide (t-CuO) calculated as CuO of 0.0010% or more and 0.10% or less.

[0019] Specific examples of the glass of this embodiment include glasses of the following first to third embodiments. The glass of the first embodiment contains, in terms of mass percentage based on oxides, SiO ２ :65~80%, Al ２ O ３ :0.10~7.0%, B ２ O ３ :0.0~5.0%, MgO:0.0~20%, CaO:0.0~20%, SrO:0.0~20%, BaO:0.0~20%, Li ２O: 0.0-20%, Na ２ O: 0.0-20%, K ２ O: 0.0~20%, Fe ２ O ３ Total iron oxides converted to R': 0.050 to 5.0% ２ It is preferable that the content of O is 10 to 20%, and that of RO is 5.0 to 20%. (RO is the total content of MgO, CaO, SrO and BaO, and R' is the total content of MgO, CaO, SrO and BaO.) ２ O is Li ２ O, Na ２ O and K ２ O)

[0020] The glass of the second embodiment contains, in terms of mass percentage based on oxides, SiO ２ :65~80%, Al ２ O ３ :0.10~7.0%, B ２ O ３ :5.0~20%, MgO:0.0~20%, CaO:0.0~20%, SrO:0.0~20%, BaO:0.0~20%, Li ２ O: 0.0-20%, Na ２ O: 0.0-20%, K ２ O: 0.0~20%, Fe ２ O ３ Total iron oxides converted to R': 0.0050 to 5.0% ２ It is preferable that O is contained in an amount of 5.0 to 20% and RO is contained in an amount of 0.0 to 20%. (RO is the total content of MgO, CaO, SrO and BaO, and R' is the total content of MgO, CaO, SrO and BaO.) ２ O is Li ２ O, Na ２ O and K ２ O)

[0021] The glass of the third embodiment contains, in terms of mass percentage based on oxides, SiO ２ : 75 to 85% Al ２ O ３ :0.10~5.0%B ２ O ３:5.0~20% MgO:0.0~5.0% CaO:0.0~5.0% SrO:0.0~5.0% BaO:0.0~5.0% Li ２ O: 0.0-5.0% Na ２ O: 0.0-5.0% K ２ O: 0.0-5.0% Fe ２ O ３ Total iron oxide converted to: 0.0050 to 5.0% R' ２ It is preferable to contain O: 1.0 to 5.0% and RO: 0.0 to 5.0%. (RO is the total content of MgO, CaO, SrO and BaO, and R' ２ O is Li ２ O, Na ２ O and K ２ O)

[0022] The glass of the present embodiment contains, in terms of mass percentage based on oxides, SiO ２ 50% or more, Al ２ O ３ 0.10% or more, Bi ２ O ３ Total bismuth oxide (t-Bi ２ O ３ ) in an amount of 0.0010% or more and 0.10% or less, and total copper oxide (t-CuO) converted to CuO in an amount of 0.0010% or more and 0.10% or less.

[0023] (SiO ２ ) SiO ２ is a component that constitutes the network structure of the glass and is an essential component of the glass of this embodiment. ２ In the glasses of the first and second embodiments, the content of SiO ２ In the glass of the third embodiment, the content of SiO is preferably 65 to 80%. ２ The content is preferably 75 to 85%.

[0024] In the glass of this embodiment, SiO ２ By making the content of SiO 50% or more, moisture resistance and chemical durability can be ensured. ２In the glasses of the first and second embodiments, from the viewpoint of further improving moisture resistance and chemical durability, the content of SiO ２ In the glass of the third embodiment, from the viewpoint of further improving moisture resistance and chemical durability, the content of SiO is preferably 65% ​​or more, more preferably 67% or more, even more preferably 68% or more, even more preferably 69% or more, particularly preferably 70% or more, and most preferably 71% or more. ２ The content is preferably 75% or more, more preferably 76% or more, even more preferably 77% or more, even more preferably 78% or more, particularly preferably 79% or more, and most preferably 80% or more.

[0025] In the glass of this embodiment, SiO ２ Although there is no particular upper limit to the content of SiO, for example, by making it 85% or less, an increase in viscosity during glass melting is suppressed, making glass production easier and improving the formability of architectural window glass, vehicle window glass, particularly windshields, cover glass for sensors, etc. ２ In the glasses of the first and second embodiments, from the viewpoint of facilitating glass production and further improving formability, the content of SiO ２ In the glass of the third embodiment, from the viewpoint of facilitating glass production and further improving formability, the content of SiO ２ The content is preferably 85% or less, more preferably 84% or less, even more preferably 83% or less, and particularly preferably 82% or less.

[0026] (Al ２ O ３ ) Al ２ O ３is a component that constitutes the network structure of the glass and is an essential component of the glass of this embodiment. ２ O ３ The content of Al is preferably 0.10 to 7.0%. ２ O ３ The content is preferably 0.10 to 5.0%.

[0027] Al in the glass of this embodiment ２ O ３ In the glass of this embodiment, the content of Al is 0.10% or more. ２ O ３ When the Al content is 0.10% or more, the Young's modulus can be increased. In addition, the weather resistance, moisture resistance, and chemical durability are improved. ２ O ３ The content is preferably 0.50% or more, more preferably 1.0% or more, even more preferably 1.5% or more, particularly preferably 2.0% or more, and most preferably 2.5% or more.

[0028] In the glass of this embodiment, Al ２ O ３ Although there is no particular upper limit to the content of Al, by making it 7.0% or less, an increase in viscosity during glass melting is suppressed, making glass production easier and improving formability. ２ O ３ The content of Al is preferably 7.0% or less, more preferably 6.5% or less, even more preferably 6.0% or less, particularly preferably 5.5% or less, and most preferably 5.0% or less. ２ O ３ The content of Al is preferably 7.0% or less, more preferably 6.5% or less, even more preferably 6.0% or less, particularly preferably 5.5% or less, and most preferably 5.0% or less. ２ O ３ The content is preferably 5.0% or less, more preferably 4.5% or less, even more preferably 4.0% or less, particularly preferably 3.5% or less, and most preferably 3.0% or less.

[0029] (Bi ２ O３ ) Bi ２ O ３ is a component that controls optical properties and is an essential component of the glass of this embodiment. ２ O ３ Total bismuth oxide (t-Bi ２ O ３ In the glass of this embodiment, Bi is contained in an amount of 0.0010% or more and 0.10% or less. ２ O ３ Total bismuth oxide (t-Bi ２ O ３ By containing Bi in an amount of 0.0010% or more, the refractive index is improved, and since the Bi has absorption in the ultraviolet region, the ultraviolet transmittance Tuv is reduced, thereby improving UV blocking performance. ２ O ３ Total bismuth oxide (t-Bi ２ O ３ The content of Bi is preferably 0.0050% or more, more preferably 0.010% or more, even more preferably 0.020% or more, particularly preferably 0.030% or more, and most preferably 0.040% or more. ２ O ３ Total bismuth oxide (t-Bi ２ O ３ The content of Bi is preferably 0.090% or less, more preferably 0.080% or less, further preferably 0.075% or less, particularly preferably 0.070% or less, and most preferably 0.065% or less. ２ O ３ Total bismuth oxide (t-Bi ２ O ３ By setting the content of ) to 0.10% or less, it is possible to suppress a decrease in visible light transmittance and prevent the glass from being colored.

[0030] (CuO) CuO is a component that controls optical properties and is an essential component of the glass of this embodiment. The glass of this embodiment contains 0.0010% or more and 0.10% or less of total copper oxide (t-CuO) converted to CuO. By containing 0.0010% or more of total copper oxide (t-CuO) converted to CuO in the glass of this embodiment, high transmittance in visible light can be maintained and near-infrared absorption performance can be imparted. The content of total copper oxide (t-CuO) converted to CuO is preferably 0.0050% or more, more preferably 0.0070% or more, even more preferably 0.0080% or more, particularly preferably 0.0085% or more, and most preferably 0.0090% or more. In the glass of this embodiment, the content of total copper oxide (t-CuO) converted to CuO is preferably 0.080% or less, more preferably 0.060% or less, even more preferably 0.040% or less, particularly preferably 0.030% or less, and most preferably 0.020% or less. By setting the content of total copper oxide (t-CuO) converted to CuO to 0.10% or less, a decrease in visible light transmittance can be suppressed and coloring of the glass can be prevented.

[0031] As one aspect of this embodiment, Bi ２ O ３ Total bismuth oxide (t-Bi ２ O ３ It is preferable that the content of Bi) is 0.010% or more, and the content of total copper oxide (t-CuO) converted to CuO is 0.0080% or more. ２ O ３ Total bismuth oxide (t-Bi ２ O ３ By setting the content of Bi and the total copper oxide (t-CuO) converted to CuO within the above ranges, the visible light transmittance and the ultraviolet transmittance can be improved due to changes in optical properties caused by solarization caused by sunlight. ２ O ３ Total bismuth oxide (t-Bi ２ O ３The content of Bi is more preferably 0.020% or more, even more preferably 0.030% or more, even more preferably 0.040% or more, particularly preferably 0.045% or more, and most preferably 0.050% or more. ２ O ３ Total bismuth oxide (t-Bi ２ O ３ The upper limit of the content of total copper oxide (t-CuO) converted to CuO is not particularly limited, but is preferably, for example, 0.10% or less. In this embodiment, the content of total copper oxide (t-CuO) converted to CuO is more preferably 0.0085% or more, even more preferably 0.0088% or more, even more preferably 0.0090% or more, particularly preferably 0.0092% or more, and most preferably 0.0095% or more. In this embodiment, the upper limit of the content of total copper oxide (t-CuO) converted to CuO is not particularly limited, but is preferably, for example, 0.10% or less.

[0032] In one aspect of this embodiment, Bi ２ O ３ Total bismuth oxide (t-Bi ２ O ３ The ratio of the content of total copper oxide (t-CuO) converted to CuO [mass ratio: (t-Bi ２ O ３ ) / (t-CuO)] is not particularly limited, but from the viewpoint of suppressing a decrease in transmittance in the visible range, it is preferably 1.0 or more, more preferably 2.0 or more, even more preferably 3.0 or more, particularly preferably 4.0 or more, and most preferably 5.0 or more. Furthermore, from the viewpoint of promoting changes in optical properties due to solarization caused by sunlight, which will be described later, the content ratio is preferably 100 or less, more preferably 80 or less, even more preferably 60 or less, even more preferably 40 or less, particularly preferably 20 or less, and most preferably 10 or less.

[0033] (B ２ O ３ ) B ２ O ３ B reduces the viscosity and density of the glass and contributes to improving the Young's modulus. It is also a component that controls the optical properties. ２ O３ The content of B in the glasses of the second and third embodiments is preferably 0.0 to 5.0%. ２ O ３ The content is preferably 5.0 to 20%.

[0034] In the glass of this embodiment, B ２ O ３ By including B, the viscosity and density of the glass can be reduced. In addition, the Young's modulus can be increased. ２ O ３ When B is contained, the content is preferably 0.50% or more, more preferably 1.0% or more, and even more preferably 2.0% or more. ２ O ３ The content is preferably 5.0% or more, more preferably 7.0% or more, even more preferably 8.0% or more, particularly preferably 9.0% or more, and most preferably 10% or more.

[0035] B in the glass of the first embodiment ２ O ３ The content of B is preferably 5.0% or less, more preferably 4.5% or less, and even more preferably 4.0% or less. ２ O ３ If the content of B is 5.0% or less, the alkali elements are less likely to volatilize during the melting and forming of the glass, and deterioration of the glass quality can be suppressed. In addition, acid resistance and alkali resistance can be improved. ２ O ３ The content of B is preferably 20% or less, more preferably 18% or less, even more preferably 17% or less, particularly preferably 16% or less, and most preferably 15% or less. ２ O ３ When the content is 20% or less, alkali elements are less likely to volatilize during the melting and forming of the glass, and deterioration of the glass quality can be suppressed. In addition, acid resistance and alkali resistance can be improved.

[0036] (MgO) MgO is a component that reduces the viscosity of the glass and contributes to improving the Young's modulus. Furthermore, because of its high electronegativity, it is a component that increases the proportion of tricoordinated boron. The content of MgO in the glass of the first and second embodiments is preferably 0.0 to 20%. The content of MgO in the glass of the third embodiment is preferably 0.0 to 5.0%.

[0037] By including MgO in the glass of this embodiment, the viscosity of the glass can be reduced and the melting of the glass raw materials can be promoted. In addition, the Young's modulus and moisture resistance can be increased. When MgO is included in the glass of this embodiment, the content is preferably 0.20% or more, more preferably 0.40% or more, even more preferably 0.60% or more, particularly preferably 0.80% or more, and most preferably 1.0% or more.

[0038] In the glasses of the first and second embodiments, the MgO content is preferably 20% or less, more preferably 15% or less, even more preferably 10% or less, particularly preferably 8.0% or less, and most preferably 6.0% or less. In the glasses of the first and second embodiments, if the MgO content is 20% or less, the glass is less likely to devitrify and an excessive increase in viscosity during glass melting is suppressed, facilitating glass production and improving the formability of vehicle window glass, particularly windshields and sensor cover glass. In the glass of the third embodiment, the MgO content is preferably 5.0% or less, more preferably 4.5% or less, even more preferably 4.0% or less, particularly preferably 3.5% or less, and most preferably 3.0% or less. In the glass of the third embodiment, if the content of MgO is 5.0% or less, the glass is less likely to devitrify, and an excessive increase in viscosity during glass melting is suppressed, facilitating glass production and improving the formability of window glass for vehicles, particularly windshields, cover glass for sensors, and the like.

[0039] (CaO) CaO is a component that reduces the viscosity of the glass. The CaO content in the first and second embodiments is preferably 0.0 to 20%. The CaO content in the glass of the third embodiment is preferably 0.0 to 5.0%.

[0040] The inclusion of CaO in the glass of this embodiment improves the meltability of the glass raw materials and further reduces the viscosity, thereby improving formability. When CaO is included in the glass of this embodiment, the content is preferably 0.20% or more, more preferably 0.40% or more, even more preferably 0.60% or more, particularly preferably 0.80% or more, and most preferably 1.0% or more.

[0041] The CaO content in the glasses of the first and second embodiments is preferably 20% or less, more preferably 15% or less, even more preferably 12% or less, particularly preferably 11% or less, and most preferably 10% or less. In the glasses of the first and second embodiments, by setting the CaO content to 20% or less, an increase in the density of the glass can be suppressed, and the average linear expansion coefficient can be reduced, thereby suppressing thermal cracking of the glass. In the glass of the third embodiment, the CaO content is preferably 5.0% or less, more preferably 4.0% or less, even more preferably 3.5% or less, even more preferably 3.0% or less, particularly preferably 2.5% or less, and most preferably 2.0% or less. In the glass of the third embodiment, by setting the CaO content to 5.0% or less, an increase in the density of the glass can be suppressed, and the average linear expansion coefficient can be reduced, thereby suppressing thermal cracking of the glass.

[0042] (SrO) SrO is a component that reduces the viscosity of the glass. The SrO content in the first and second embodiments is preferably 0.0 to 20%. The SrO content in the glass of the third embodiment is preferably 0.0 to 5.0%. When SrO is contained in the glass of this embodiment, the SrO content may be 0.20% or more, 0.40% or more, 0.60% or more, 0.80% or more, or 1.0% or more.

[0043] In the glasses of the first and second embodiments, the SrO content is preferably 20% or less, more preferably 15% or less, even more preferably 10% or less, particularly preferably 8.0% or less, and most preferably 5.0% or less. In the glasses of the first and second embodiments, by setting the SrO content to 20% or less, an increase in the density of the glass can be suppressed. In the glass of the third embodiment, the SrO content is preferably 5.0% or less, more preferably 4.0% or less, even more preferably 3.0% or less, even more preferably 2.0% or less, particularly preferably 1.0% or less, particularly preferably 0.5% or less, and most preferably substantially free of SrO. In the glass of this embodiment, "substantially free of SrO" means that the SrO content in the glass is 0.10% or less. In the glass of the third embodiment, by setting the SrO content to 5.0% or less, an increase in the density of the glass can be suppressed.

[0044] (BaO) BaO is a component that reduces the viscosity of the glass. In the first and second embodiments, the BaO content is preferably 0.0 to 20%. In the glass of the third embodiment, the BaO content is preferably 0.0 to 5.0%. When BaO is contained in the glass of this embodiment, the BaO content may be 0.20% or more, 0.40% or more, 0.60% or more, 0.80% or more, or 1.0% or more.

[0045] In the glasses of the first and second embodiments, the BaO content is preferably 20% or less, more preferably 15% or less, even more preferably 10% or less, particularly preferably 8.0% or less, and most preferably 5.0% or less. In the glasses of the first and second embodiments, by setting the BaO content to 20% or less, an increase in the density of the glass can be suppressed. In the glass of the third embodiment, the BaO content is preferably 5.0% or less, more preferably 4.0% or less, even more preferably 3.0% or less, even more preferably 2.0% or less, even more preferably 1.0% or less, particularly preferably 0.50% or less, and most preferably substantially free. In the glass of the third embodiment, "substantially free of BaO" means that the BaO content in the glass is 0.10% or less. In the glass of this embodiment, by setting the BaO content to 5.0% or less, an increase in the density of the glass can be suppressed.

[0046] (RO) In the glass of this embodiment, by containing at least one selected from MgO, CaO, SrO, and BaO, the Young's modulus can be improved. In the glass of the first embodiment, the total content of MgO, CaO, SrO, and BaO (hereinafter, may be referred to as RO) is preferably 5.0 to 20%. In the glass of the second embodiment, RO is preferably 0.0 to 20%. In the glass of the third embodiment, RO is preferably 0.0 to 5.0%.

[0047] In the glass of the first embodiment, RO is preferably 5.0% or more, more preferably 7.0% or more, even more preferably 8.0% or more, even more preferably 9.0% or more, particularly preferably 10% or more, and most preferably 11% or more. In the glass of the first embodiment, if RO is 5.0% or more, the Young's modulus can be improved. In the glasses of the second and third embodiments, when RO is contained, RO is preferably 0.20% or more, more preferably 0.40% or more, even more preferably 0.60% or more, particularly preferably 0.80% or more, and most preferably 1.0% or more.

[0048] In the glasses of the first and second embodiments, RO is preferably 20% or less, more preferably 18% or less, even more preferably 17% or less, particularly preferably 16% or less, and most preferably 15% or less. When RO is 20% or less, an increase in the density of the glass can be suppressed, and the crack resistance of the glass can be improved. In the glass of the third embodiment, RO is preferably 5.0% or less, more preferably 4.5% or less, even more preferably 4.0% or less, even more preferably than 3.5% or less, particularly preferably 3.0% or less, particularly preferably 2.5% or less, and most preferably 2.0% or less. When RO is 5.0% or less, an increase in the density of the glass can be suppressed, and the crack resistance of the glass can be improved.

[0049] (Li ２ O) Li ２ O is a component that improves the melting property of glass and reduces its viscosity. In addition, O is a component that increases the Young's modulus and contributes to the average linear expansion coefficient of glass. Furthermore, the strength of glass can be increased by performing a chemical strengthening treatment by ion exchange with Na ions. Li in the glasses of the first and second embodiments ２ The content of O is preferably 0.0 to 20%. ２ The content of O is preferably 0.0 to 5.0%. ２ By containing O, Na ２ O and K ２ It can reduce the viscosity of the glass compared to O. ２ The O content is preferably 0.25% or more, more preferably 0.50% or more, even more preferably 0.60% or more, even more preferably 0.70% or more, particularly preferably 0.80% or more, and most preferably 0.90% or more. ２ The O content is preferably 20% or less, more preferably 15% or less, even more preferably 10% or less, particularly preferably 5.0% or less, and most preferably 3.0% or less. ２By setting the O content to 20% or less, it is possible to suppress thermal cracking of the glass due to an excessively large average linear expansion coefficient. Furthermore, it is possible to suppress the formation of a crystalline phase containing Li during the production of the glass, thereby improving the manufacturability of the glass. ２ The O content is preferably 5.0% or less, more preferably 4.5% or less, even more preferably 4.0% or less, particularly preferably 3.8% or less, and most preferably 3.5% or less. ２ By ensuring that the O content is 5.0% or less, it is possible to suppress thermal cracking of the glass due to an excessively large average linear expansion coefficient, and it is also possible to suppress the formation of a crystalline phase containing Li during glass production, thereby improving the manufacturability of the glass.

[0050] (Na ２ O) Na ２ O is a component that improves the melting property of glass and reduces its viscosity, and also makes it easier to increase the Young's modulus and contributes to the average linear expansion coefficient of the glass. Furthermore, the strength of the glass can be increased by performing a chemical strengthening treatment by ion exchange with K ions. ２ The content of O is preferably 0.0 to 20%. ２ The content of O is preferably 0.0 to 5.0%. ２ By including O, the viscosity of the glass can be reduced. In addition, the Young's modulus and the average coefficient of linear expansion can be increased. ２ The O content is preferably 1.0% or more, more preferably 1.5% or more, even more preferably 2.0% or more, even more preferably 2.5% or more, particularly preferably 3.0% or more, particularly preferably 3.5% or more, and most preferably 4.0% or more. ２ The O content is preferably 20% or less, more preferably 18% or less, even more preferably 16% or less, particularly preferably 15% or less, and most preferably 14% or less. ２By making the O content 20% or less, it is possible to suppress thermal cracking of the glass due to an excessively large average linear expansion coefficient. In addition, the moisture resistance of the glass is improved, making it suitable for use as glass that is exposed to the atmosphere for a long period of time, such as window glass for vehicles. In the glass of the third embodiment, Na ２ The O content is preferably 5.0% or less, more preferably 4.5% or less, even more preferably 4.0% or less, particularly preferably 3.8% or less, and most preferably 3.5% or less. ２ By ensuring that the O content is 5.0% or less, thermal cracking of the glass due to an excessively large average linear expansion coefficient can be suppressed. In addition, the moisture resistance of the glass is improved, making it suitable for use as glass exposed to the atmosphere for long periods of time, such as vehicle window glass.

[0051] (K ２ O) K ２ O is a component that improves the melting property of glass and reduces the viscosity, and also makes it easier to increase the Young's modulus and contributes to the average linear expansion coefficient of the glass. ２ O is Li ２ O and Na ２ Compared to O, K has the effect of increasing the average linear expansion coefficient and density. ２ The content of O is preferably 0.0 to 20%. ２ The content of O is preferably 0.0 to 5.0%. ２ By including O, the viscosity of the glass can be reduced. In addition, the Young's modulus and the average linear expansion coefficient can be increased. ２ When O is contained, the content is preferably 0.10% or more, more preferably 0.20% or more, even more preferably 0.30% or more, particularly preferably 0.40% or more, and most preferably 0.50% or more. ２ The O content is preferably 20% or less, more preferably 15% or less, even more preferably 10% or less, particularly preferably 7.5% or less, and most preferably 5.0% or less. ２By setting the O content to 20% or less, it is possible to suppress thermal cracking of the glass due to an excessively large average linear expansion coefficient. ２ The O content is preferably 5.0% or less, more preferably 4.0% or less, even more preferably 3.0% or less, particularly preferably 2.5% or less, and most preferably 2.0% or less. ２ When the O content is 5.0% or less, thermal cracking of the glass due to an excessively large average linear expansion coefficient can be suppressed.

[0052] (R' ２ O) In the glass of the first embodiment, Li ２ O, Na ２ O and K ２ The total content of O (hereinafter referred to as R' ２ In the glass of the second embodiment, R' is preferably 10 to 20%. ２ The content of O is preferably 5.0 to 20%. ２ The content of O is preferably 1.0 to 5.0%. ２ O is preferably 10% or more, more preferably 11% or more, even more preferably 12% or more, particularly preferably 13% or more, and most preferably 14% or more. ２ When O is 10% or more, the Young's modulus is increased and the viscosity of the glass is reduced, thereby improving the moldability. ２ O is preferably 5.0% or more, more preferably 5.5% or more, even more preferably 6.0% or more, even more preferably 6.5% or more, particularly preferably 7.0% or more, particularly preferably 7.5% or more, and most preferably 8.0% or more. ２ When O is 5.0% or more, the Young's modulus is increased and the viscosity of the glass is reduced, thereby improving the moldability. ２O is preferably 1.0% or more, more preferably 1.5% or more, even more preferably 2.0% or more, even more preferably 2.5% or more, particularly preferably 3.0% or more, particularly preferably 3.5% or more, and most preferably 3.8% or more. ２ When the O content is 1.0% or more, the Young's modulus increases and the viscosity of the glass decreases, improving moldability.

[0053] In the glasses of the first and second embodiments, R' ２ O is preferably 20% or less, more preferably 19% or less, even more preferably 18% or less, even more preferably 17% or less, particularly preferably 16% or less, and most preferably 15% or less. ２ If O is 20% or less, an increase in density can be suppressed and the moisture resistance of the glass can be further improved. In the glass of the third embodiment, R' is preferably 5.0% or less, more preferably 4.8% or less, even more preferably 4.6% or less, even more preferably 4.4% or less, particularly preferably 4.3% or less, and most preferably 4.2% or less. In the glass of the third embodiment, R' is preferably 5.0% or less, more preferably 4.8% or less, even more preferably 4.6% or less, even more preferably 4.4% or less, particularly preferably 4.3% or less, and most preferably 4.2% or less. ２ If the O content is 5.0% or less, an increase in density can be suppressed and the moisture resistance of the glass can be further improved.

[0054] (Fe ２ O ３ ) Fe ２ O ３ is a component that improves the heat insulating properties of the glass and also contributes to the color of the glass. ２ O ３ The total iron content converted to ferrous iron is the oxide of divalent iron, FeO, and the oxide of trivalent iron, Fe ２ O ３ This refers to the total amount of iron, including

[0055] In one aspect of the glass of this embodiment, Fe ２ O ３ The total iron oxide content calculated as Fe is preferably 0.0050% or more and 5.0% or less. ２ O ３The total iron oxide content calculated as Fe is preferably 0.0050% or more, more preferably 0.0060% or more, even more preferably 0.0080% or more, particularly preferably 0.010% or more, and most preferably 0.012% or more. ２ O ３ When the total iron oxide content calculated as Fe is 0.0050% or more, heat insulation properties are improved, design properties are imparted, and heat is easily transferred to the glass during bending of the glass, thereby improving formability. ２ O ３ The total iron oxide content, calculated as Fe, is preferably 5.0% or less, more preferably 4.8% or less, even more preferably 4.6% or less, particularly preferably 4.4% or less, and most preferably 4.2% or less. ２ O ３ By setting the total iron oxide content, calculated as % by weight, to 5.0% or less, it is possible to improve the heat insulation properties and the formability during bending of the glass while suppressing a decrease in light transmittance in the visible range.

[0056] In one aspect of the glass of this embodiment, Fe ２ O ３ The total iron oxide content calculated as Fe is preferably 0.010% or more and 0.10% or less. ２ O ３ The total iron oxide content calculated as Fe is preferably 0.010% or more, more preferably 0.012% or more, even more preferably 0.014% or more, particularly preferably 0.016% or more, and most preferably 0.018% or more. ２ O ３ When the total iron oxide content calculated as Fe is 0.010% or more, heat insulation properties are improved, design properties are imparted, and heat is easily transferred to the glass during bending of the glass, thereby improving formability. ２ O ３ The total iron oxide content calculated as Fe is preferably 0.10% or less, more preferably 0.095% or less, even more preferably 0.090% or less, particularly preferably 0.085% or less, and most preferably 0.080% or less. ２ O ３By setting the total iron oxide content, calculated as iron oxide content, to 0.10% or less, it is possible to suppress a decrease in light transmittance in the ultraviolet, visible, and near-infrared regions.

[0057] In another aspect of the glass of this embodiment, Fe ２ O ３ It is also preferable that the total iron oxide content calculated as Fe is more than 0.10% and not more than 1.0%. ２ O ３ The total iron oxide content calculated as Fe is preferably more than 0.10%, more preferably 0.20% or more, even more preferably 0.30% or more, particularly preferably 0.40% or more, and most preferably 0.45% or more. ２ O ３ When the total iron oxide content calculated as Fe is more than 0.10%, the heat insulating property is improved, designability is imparted, and heat is easily transferred to the glass during bending of the glass, thereby improving formability. ２ O ３ The total iron oxide content calculated as Fe is preferably 1.0% or less, more preferably 0.90% or less, even more preferably 0.80% or less, particularly preferably 0.75% or less, and most preferably 0.70% or less. ２ O ３ By setting the total iron oxide content, calculated as % by weight, to 1.0% or less, it is possible to improve the heat insulation properties and the formability during bending of the glass while suppressing a decrease in light transmittance in the visible range.

[0058] The glass of this embodiment contains Fe ２ O ３ Fe in total iron oxide converted to ２ O ３ It is preferable that the mass percentage (%) of divalent iron converted to Fe (hereinafter referred to as Fe-Redox) is 10% or more. ２ O ３ Fe relative to the total iron oxide content converted ２ O ３ Conversion Fe ２＋ The content ratio is 10% or more. Fe-Redox has absorption in the near infrared region. ２＋Since the content of β-glucan can be increased, heat is more easily transferred to the glass melt during glass production, improving manufacturability. In addition, the transmittance in the near-infrared region is reduced, improving heat insulation, making the glass suitable for applications requiring heat insulation, such as architectural and vehicle glass.

[0059] When the glass of this embodiment is used for window glass for buildings or vehicles, the Fe-Redox is more preferably 15% or more, further preferably 20% or more, particularly preferably 22% or more, and most preferably 25% or more. Also, the Fe-Redox is preferably 50% or less. By having the Fe-Redox content of 50% or less, deterioration of the melting equipment can be suppressed and the amount of SO in the fining agent can be reduced. ３ When Fe-Redox is used, amber coloring can be suppressed and a decrease in visible light transmittance can be suppressed. Fe-Redox is more preferably 45% or less, further preferably 40% or less, and particularly preferably 38% or less.

[0060] When the glass of this embodiment is used for a sensor glass, the Fe-Redox is more preferably 10% or more, even more preferably 12% or more, particularly preferably 14% or more, and most preferably 15% or more. Furthermore, the Fe-Redox is preferably 35% or less. By keeping the Fe-Redox content at 35% or less, it is possible to suppress a decrease in transmittance in the near-infrared region. The Fe-Redox is more preferably 30% or less, even more preferably 28% or less, and particularly preferably 25% or less.

[0061] Fe-Redox can be adjusted by the raw material composition, melting temperature, and melting atmosphere. Fe-Redox can also be adjusted by controlling the degree of oxidation-reduction of the glass melt using a reducing agent such as coke or ammonium chloride, or an oxidizing agent such as chromium oxide or cerium oxide as raw materials.

[0062] Other components and properties of the glasses of the present embodiment, including the first to third embodiments, will be described below.

[0063] [Other Components] The glass of the present embodiment may contain components other than the above components (hereinafter also referred to as "other components"). Examples of other components include TiO ２ , ZrO ２, Y ２ O ３ , CeO ２ , Nd ２ O ５ , GaO ２ , GeO ２ , MnO ２ , NiO, Cr ２ O ３ , V ２ O ５ , Au ２ O ３ , Ag ２ O, CuO, CdO, MoO ３ , S.O. ３ , Cl, F, SnO ２ , Sb ２ O ３ The metal ions or oxides may be used.

[0064] Other components may be contained for various purposes (for example, clarification and coloring, imparting chemical durability, etc.), for example, preferably in a total amount of 3.0% or less. If the total content of other components is 3.0% or less, the properties required for architectural window glass, vehicle window glass, and sensor glass can be maintained. The total content of other components is more preferably 2.5% or less, even more preferably 2.0% or less, even more preferably 1.5% or less, particularly preferably 1.0% or less, particularly preferably 0.80% or less, and most preferably 0.50% or less. In order to prevent environmental impact, As ２ O ３ The content of each of PbO is preferably less than 0.0010%, and more preferably substantially none is contained.

[0065] The glass of this embodiment is ZrO ２ ZrO ２ is a component that improves chemical durability. ２ When ZrO is contained, its content is preferably 0.010% or more, more preferably 0.050% or more, further preferably 0.10% or more, and particularly preferably 0.20% or more. ２The content is preferably 2.0% or less, more preferably 1.5% or less, even more preferably 1.0% or less, and particularly preferably 0.50% or less.

[0066] The glass of this embodiment is TiO ２ It may contain TiO ２ is a component that has absorption in the ultraviolet region, thereby reducing the ultraviolet transmittance Tuv, improving UV blocking performance, and enhancing solarization resistance. ２ When TiO is contained, its content is preferably 0.0050% or more, more preferably 0.0080% or more, even more preferably 0.010% or more, particularly preferably 0.015% or more, and most preferably 0.020% or more. ２ The content is preferably 1.0% or less, more preferably 0.80% or less, even more preferably 0.70% or less, even more preferably 0.60% or less, still more preferably 0.50% or less, particularly preferably 0.40% or less, and most preferably 0.30% or less.

[0067] The glass of this embodiment is Y ２ O ３ Y ２ O ３ is a component that improves Young's modulus. ２ O ３ When Y is contained, its content is preferably 0.10% or more, more preferably 0.20% or more, further preferably 0.30% or more, and particularly preferably 0.40% or more. ２ O ３ The content is preferably 2.0% or less, more preferably 1.5% or less, further preferably 1.0% or less, particularly preferably 0.80% or less.

[0068] In the glass of this embodiment, if NiO is contained, NiS may be generated, which may cause glass breakage, so the NiO content is preferably 0.0080% or less, more preferably 0.0040% or less, even more preferably 0.0020% or less, and particularly preferably substantially zero.

[0069] The glass of this embodiment contains CeO ２ It may contain CeO ２ Since CeO absorbs light in the ultraviolet region, it reduces the ultraviolet transmittance Tuv and improves UV blocking performance. It also acts as an oxidizing agent and can control Fe-Redox. ２ When CeO is contained, its content is preferably 0.0010% or more, more preferably 0.0050% or more, further preferably 0.0080% or more, and particularly preferably 0.010% or more. ２ absorbs ultraviolet light, which can cause solarization and reduce transmittance in the visible range. ２ O ３ and CuO may inhibit solarization. ２ The content is preferably 0.60% or less, more preferably 0.40% or less, even more preferably 0.20% or less, even more preferably 0.10% or less, particularly preferably 0.050% or less, and most preferably 0.030% or less.

[0070] The glass of this embodiment is Cr ２ O ３ Cr ２ O ３ acts as an oxidizing agent and can control Fe-Redox. ２ O ３ When Cr is contained, its content is preferably 0.0020% or more, and more preferably 0.0040% or more. ２ O ３ Since Fe has coloration in the visible range, there is a risk of a decrease in visible light transmittance. ２＋ Therefore, the glass of the present embodiment is preferably made of Cr. ２ O ３When it is contained, the content is preferably 0.020% or less, more preferably 0.016% or less, further preferably 0.012% or less, and particularly preferably 0.0080% or less.

[0071] The glass of this embodiment is SnO ２ It may contain SnO ２ acts as a reducing agent and can control Fe-Redox. ２ When SnO is contained, its content is preferably 0.010% or more, more preferably 0.040% or more, further preferably 0.060% or more, and particularly preferably 0.080% or more. ２ In order to suppress defects caused by SnO in the glass of this embodiment, ２ The content of is preferably 0.40% or less, more preferably 0.30% or less, further preferably 0.20% or less, particularly preferably 0.15% or less.

[0072] The glass of this embodiment is SO ３ SO ３ acts as a fining agent to improve the bubble quality of the glass. ３ When SO is contained, its content is preferably 0.0010% or more, more preferably 0.0040% or more, further preferably 0.0070% or more, and particularly preferably 0.015% or more. ３ If the Fe-Redox is high, amber coloring occurs, turning the glass brown, and there is a risk of a decrease in visible light transmittance. ３ When it is contained, the content is preferably 0.30% or less, more preferably 0.20% or less, further preferably 0.15% or less, particularly preferably 0.10% or less.

[0073] The glass of this embodiment may contain Cl. Cl acts as a fining agent and improves the bubble quality of the glass. When the glass of this embodiment contains Cl, the Cl content is preferably 0.080% or more, more preferably 0.15% or more, even more preferably 0.20% or more, particularly preferably 0.25% or more, and most preferably 0.30% or more. If the Cl content is high, Cl volatilized from the glass melt may be easily dissolved. ２The gas may corrode surrounding members. When the glass of the present embodiment contains Cl, the Cl content is preferably 1.0% or less, more preferably 0.80% or less, even more preferably 0.60% or less, and particularly preferably 0.50% or less.

[0074] [Characteristics] (T ｇ ) the glass transition temperature (T ｇ ) is preferably in the range of 460 to 590°C. ｇ If the temperature is within this predetermined range, the glass can be bent within the range of normal manufacturing conditions. ｇ By ensuring that the temperature is 460°C or higher, the alkali metal content or alkaline earth metal content does not become too large, and the average linear expansion coefficient of the glass can be prevented from increasing. In addition, moisture resistance and devitrification of the glass are suppressed, and formability is improved. ｇ is more preferably 480° C. or higher, further preferably 490° C. or higher, and particularly preferably 500° C. or higher. From the viewpoint of preventing the bending temperature of the glass from becoming excessive and facilitating production, T ｇ is preferably 590°C or lower, more preferably 585°C or lower, even more preferably 580°C or lower, particularly preferably 575°C or lower, and most preferably 570°C or lower.

[0075] (T １１ In the glass of this embodiment, the glass viscosity η, which is the standard for bending workability, is 10 １１ [dPa s] Temperature T １１ It is preferable that T is 700°C or less. １１ By keeping the temperature at 700°C or less, bending and forming can be performed at a low temperature. １１ As a method for lowering the temperature to 700° C. or less, for example, the R′ of the glass component ２ O, R ２ Increase the content of O and RO, and Al ２ O ３ A method for reducing the content of R ２ Among O, Li ２ Method for incorporating O, SiO ２ A method for reducing the content of ２ O ３In the glass of this embodiment, the content of T １１ is more preferably 670°C or less, even more preferably 660°C or less, even more preferably 650°C or less, particularly preferably 640°C or less, particularly preferably 630°C or less, and most preferably 620°C or less. From the viewpoint of maintaining the fracture toughness of the glass, preventing the average linear expansion coefficient of the glass from becoming too large, and from the viewpoint of the firing temperature of the black ceramic printed on the windshield, T １１ The temperature is preferably 570°C or higher, more preferably 575°C or higher, even more preferably 580°C or higher, particularly preferably 585°C or higher, and most preferably 590°C or higher.

[0076] (Average coefficient of linear expansion) The average coefficient of linear expansion (CTE) of the glass of this embodiment at 50 to 350°C is 100 × 10 －７ / °C or less. The average linear expansion coefficient is preferably 100 x 10 －７ / °C or less, cracking due to heat shock can be suppressed when the glass is used as glass for vehicles or sensors. Furthermore, when the glass of this embodiment is used as bent glass, the difference in thermal expansion due to differences in thermal history within the surface is suppressed, and bent glass with good dimensional and surface accuracy can be obtained. The average linear expansion coefficient of the glass of this embodiment at 50 to 350°C is 98 x 10 －７ / °C or less is more preferable, and 96 x 10 －７ / °C or less is more preferable, and 94 x 10 －７ / °C or less is even more preferable, and 92 x 10 －７ / °C or less is particularly preferred, and 90 x 10 －７ / °C or less. From the viewpoint of suppressing cracking of the black ceramic due to the difference in thermal expansion between the glass of this embodiment and the black ceramic printed on the windshield, the glass of this embodiment has an average linear expansion coefficient of 30 x 10 －７ / °C or more. －７ / °C or more, the difference in thermal expansion with the black ceramic is small, and cracking of the black ceramic can be suppressed. －７ / °C or more, and 35 x 10 －７ / °C or more is more preferable, and 40 x 10 －７ / °C or more is particularly preferred, and 45 x 10 －７ / °C or more is particularly preferred, and 50 x 10 －７ / °C or more is particularly preferred, and 55 x 10 －７ / °C or more is most preferable. In order to set the average linear expansion coefficient within the above range, the SiO ２ Increase the content of R ２ O or R' ２ O, RO and Al ２ O ３ The content of B ２ O ３ The method for adjusting the content and the coordination number of boron is mentioned.

[0077] (Density) The density of the glass of this embodiment is 2.60 g / cm ３ It is preferable that the density is 2.60 g / cm or less. ３ By keeping the density of the glass at 2.58 g / cm or less, increases in fuel consumption and electricity consumption due to weight increases can be suppressed. ３ More preferably, 2.56 g / cm ３ More preferably, 2.54 g / cm ３ Even more preferably, 2.52 g / cm ３ The following is particularly preferred: ３ The following is particularly preferred: 2.50 g / cm ３ From the viewpoint of improving sound insulation, the density of the glass of the present embodiment is most preferably 2.20 g / cm or less. ３ More than 2.25 g / cm ３ More preferably, 2.27 g / cm ３ More than 2.30 g / cm is particularly preferred. ３ The above is most preferable.

[0078] (Young's modulus) The Young's modulus of the glass of this embodiment is preferably 60 GPa or more. A Young's modulus of 60 GPa or more provides the glass with high rigidity and improved fracture toughness, making it more suitable for use as window glass for vehicles or buildings, or as cover glass for sensors such as LiDAR. The Young's modulus of the glass of this embodiment is more preferably 62 GPa or more, even more preferably 64 GPa or more, even more preferably 66 GPa or more, particularly preferably 68 GPa or more, and most preferably 70 GPa or more. Furthermore, from the viewpoint of suppressing deformation and cracking when the glass is subjected to an external force, the Young's modulus is preferably 85 GPa or less, more preferably 82 GPa or less, even more preferably 80 GPa or less, particularly preferably 78 GPa or less, and most preferably 76 GPa or less. In order to achieve a Young's modulus within the above range, the proportion of tetracoordinated boron is increased, RO, R' ２ O and R ２ Examples of methods include adjusting the type and amount of O. Young's modulus can be measured by an ultrasonic pulse method based on JIS R1602:1995 "Testing method for elastic modulus of fine ceramics."

[0079] (Rigidity Modulus) The rigidity modulus of the glass of this embodiment is preferably 25 GPa or more. If the rigidity modulus is 25 GPa or more, the glass is less likely to deform when subjected to an external force. The rigidity modulus of the glass is more preferably 26 GPa or more, even more preferably 27 GPa or more, particularly preferably 28 GPa or more, and most preferably 29 GPa or more. Furthermore, since deformation occurs when the glass is subjected to an external force, consuming energy and thereby suppressing cracking, the rigidity modulus is preferably 35 GPa or less, more preferably 34 GPa or less, even more preferably 33 GPa or less, and particularly preferably 32 GPa or less. The rigidity modulus can be measured by an ultrasonic pulse method based on JIS R1602:1995 "Testing Method for Elastic Modulus of Fine Ceramics."

[0080] (Poisson's ratio) The Poisson's ratio of the glass of this embodiment is preferably 0.27 or less. The smaller the Poisson's ratio, the smaller the stress generated when an external force is applied to the glass. The Poisson's ratio is more preferably 0.26 or less, even more preferably 0.25 or less, even more preferably 0.24 or less, still more preferably 0.23 or less, particularly preferably 0.22 or less, and most preferably 0.21 or less. The Poisson's ratio can be measured by an ultrasonic pulse method based on JIS R1602:1995 "Testing Method for Elastic Modulus of Fine Ceramics."

[0081] (Visible Light Transmittance: Tv) The glass of the present embodiment preferably has a ΔTv defined below of 0.010% or more. ΔTv: the difference obtained by subtracting the visible light transmittance Tv of the glass sheet before irradiation from the visible light transmittance Tv of the glass sheet after irradiation with simulated sunlight for two hours. The simulated sunlight is irradiated with an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is prepared by melting the glass of this embodiment at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. Tv is calculated using the standard spectral distribution of solar radiation in accordance with the provisions of JIS-R3106:1998.

[0082] When ΔTv is 0.010% or more, the visible light transmittance can be increased by solarization due to sunlight. ΔTv is more preferably 0.050% or more, even more preferably 0.10% or more, particularly preferably 0.15% or more, and most preferably 0.20% or more. There is no upper limit to ΔTv, but it is, for example, 1.0% or less. In order to set ΔTv in the above range, the glass composition, particularly Bi, ２ O ３ and / or by adjusting the CuO content.

[0083] The glass of this embodiment preferably has a visible light transmittance Tv of 75% or more, calculated using the standard spectral distribution of solar radiation in accordance with JIS-R3106:1998 when converted to a thickness of 2.00 mm. A Tv of 75% or more provides excellent transparency, making the glass more suitable for vehicle or architectural window glass, particularly windshields and door glass. Tv is more preferably 78% or more, even more preferably 80% or more, and even more preferably 82% or more. 84% or more is particularly preferred, and 85% or more is most preferred. The upper limit of Tv is not particularly limited, but is, for example, 93% or less. In order to achieve Tv in the above range, the glass composition, particularly SiO ２ and Fe ２ O ３ The content of B ２ O ３ This can be achieved by adjusting the content and the coordination number of boron.

[0084] (Ultraviolet Transmittance: Tuv) In one aspect of the glass of the present embodiment, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 10 to 79%, ΔTuv defined below is preferably −0.05% or less. ΔTuv: difference obtained by subtracting the ultraviolet transmittance Tuv of the glass sheet before irradiation from the ultraviolet transmittance Tuv of the glass sheet after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is prepared by melting the glass of this embodiment at 1650° C., slowly cooling it, and polishing it to a thickness of 2.00 mm.

[0085] In the above-described embodiment, when ΔTuv is −0.05% or less, solarization due to sunlight reduces the ultraviolet transmittance, and therefore, when used in laminated glass, damage to the interlayer film due to sunlight can be suppressed. In this embodiment, ΔTuv is more preferably −0.10% or less, even more preferably −0.20% or less, even more preferably −0.30% or less, particularly preferably −0.40% or less, and most preferably −0.50% or less. In this embodiment, the lower limit of ΔTuv is not limited, but is, for example, −2.0% or more.

[0086] In another aspect of the glass of the present embodiment, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 80 to 93%, ΔTuv defined below is preferably 0.10% or more. ΔTuv: the difference obtained by subtracting the ultraviolet transmittance Tuv of the glass sheet before irradiation from the ultraviolet transmittance Tuv of the glass sheet after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is prepared by melting the glass of this embodiment at 1650° C., slowly cooling it, and polishing it to a thickness of 2.00 mm.

[0087] In the above-described embodiment, when ΔTuv is 0.10% or more, transmittance in the ultraviolet region can be improved by solarization due to sunlight. In this embodiment, ΔTuv is more preferably 0.20% or more, even more preferably 0.30% or more, even more preferably 0.40% or more, particularly preferably 0.50% or more, and most preferably 0.60% or more. In this embodiment, the upper limit of ΔTuv is not limited, but is, for example, 2.0% or less.

[0088] In another aspect of the glass of the present embodiment, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 80 to 93%, ΔTuv defined below may be −0.35% or less. ΔTuv: the difference obtained by subtracting the ultraviolet transmittance Tuv of the glass sheet before irradiation from the ultraviolet transmittance Tuv of the glass sheet after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is prepared by melting the glass of this embodiment at 1650° C., slowly cooling it, and polishing it to a thickness of 2.00 mm.

[0089] In the above-described embodiment, when ΔTuv is −0.35% or less, solarization due to sunlight reduces the ultraviolet transmittance, and therefore, when used in laminated glass, damage to the interlayer film due to sunlight can be suppressed. In this embodiment, ΔTuv is more preferably −0.40% or less, even more preferably −0.45% or less, particularly preferably −0.50% or less, and most preferably −0.55% or less. In this embodiment, the lower limit of ΔTuv is not limited, but is, for example, −2.0% or more.

[0090] Tuv is the ultraviolet transmittance defined in ISO 9845A:1992. ΔTuv is the glass composition, especially Bi ２ O ３ and / or by adjusting the content of CuO.

[0091] The glass of this embodiment preferably has an ultraviolet transmittance Tuv defined in ISO9845A:1992 of 90% or less when converted to a thickness of 2.00 mm. A Tuv of 90% or less can suppress deterioration of components such as interlayers and seats inside the vehicle cabin when the glass of this embodiment is used in laminated glass. Tuv is more preferably 80% or less, even more preferably 70% or less, even more preferably 65% ​​or less, still more preferably 60% or less, still more preferably 55% or less, particularly preferably 45% or less, and most preferably 40% or less. The lower limit of Tuv is, for example, 1.0% or more. To set Tuv within the above range, the glass composition, in particular SiO ２ and Fe ２ O ３ , TiO ２ , CeO ２ , Bi ２ O ３ This can be achieved by adjusting CuO or Fe-Redox.

[0092] (Color coordinate a ＊ The glass of this embodiment has an L when light from a D65 light source is incident at an incident angle of 0 degrees. ＊ a ＊ b ＊ Color coordinate a of the reflected color in the color system ＊ For Δa defined below ＊It is preferable that the absolute value of Δa is 0.05 or less. ＊ : Color coordinate a of the glass plate after 2 hours of irradiation with simulated sunlight ＊ From the above, the color coordinates a of the glass plate before irradiation ＊ The pseudo-sunlight has an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is prepared by melting the glass of this embodiment at 1650° C., slowly cooling it, and polishing it to a thickness of 2.00 mm.

[0093] Δa ＊ When the absolute value of Δa is 0.05 or less, the change in color due to coloring can be suppressed. ＊ The absolute value of Δa is more preferably 0.04 or less, further preferably 0.03 or less, and particularly preferably 0.02 or less. ＊ In order to set the absolute value of in the above range, the glass composition, particularly Bi ２ O ３ and / or by adjusting the content of CuO.

[0094] (Color coordinate b ＊ The glass of this embodiment has a color coordinate b of the reflected color in the L*a*b* color system when light from a D65 light source is incident at an incident angle of 0 degrees. ＊ For Δb defined below ＊ It is preferable that the absolute value of Δb is 0.07 or less. ＊ : Color coordinate b of the glass plate after 2 hours of irradiation with simulated sunlight ＊ From the above, the color coordinates b of the glass plate before irradiation ＊ The pseudo-sunlight has an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is prepared by melting the glass of this embodiment at 1650° C., slowly cooling it, and polishing it to a thickness of 2.00 mm.

[0095] Δb ＊ When the absolute value of Δb is 0.07 or less, the change in color due to coloring can be suppressed. ＊ The absolute value of Δb is more preferably 0.05 or less, even more preferably 0.04 or less, particularly preferably 0.03 or less, and most preferably 0.02 or less.＊ In order to set the absolute value of in the above range, the glass composition, particularly Bi ２ O ３ and / or by adjusting the content of CuO.

[0096] (Saturation C ＊ The glass of this embodiment has an L when light from a D65 light source is incident at an incident angle of 0 degrees. ＊ a ＊ b ＊ Saturation of reflected color in the color system C ＊ For ΔC defined below ＊ It is preferable that the absolute value of ΔC is 0.07 or less. ＊ : Chroma C of the glass plate after 2 hours of irradiation with simulated sunlight ＊ From the above, the saturation C of the glass plate before the irradiation ＊ The pseudo-sunlight has an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is prepared by melting the glass of this embodiment at 1650° C., slowly cooling it, and polishing it to a thickness of 2.00 mm.

[0097] ΔC ＊ When the absolute value of ΔC is 0.07 or less, the change in color due to coloring can be suppressed. ＊ The absolute value of ΔC is more preferably 0.05 or less, further preferably 0.04 or less, particularly preferably 0.03 or less, and most preferably 0.02 or less. In addition, it is possible to approach a neutral color tone by solarization due to sunlight, and in the case of use as a window glass for a vehicle, ΔC ＊ is more preferably 0.00 or less, further preferably −0.01 or less, particularly preferably −0.02 or less, and most preferably −0.03 or less. ＊ In order to set the value in the above range, the glass composition, particularly Bi ２ O ３ and / or by adjusting the content of CuO.

[0098] (Area of ​​the Main Surface) When the glass of the present embodiment is used as a window glass for a vehicle, the shape of the glass of the present embodiment is not particularly limited, but the area of ​​the main surface is 0.25 m ２ More than 0.45m is preferable.２ More preferably, 0.90 m or more ２ The above is even more preferable. When the area of ​​the glass is within the above range, it can be adapted to various vehicle models. Furthermore, if the area of ​​the glass is too large, it becomes difficult to handle, the temperature distribution during heating becomes uneven, the dimensional accuracy after bending becomes poor, and so on, making bending more difficult. Therefore, the glass of this embodiment is designed so that the area of ​​the main surface is within 10 m ２ Preferably less than 7m ２ Less than 5m is more preferable. ２ The following is even more preferred:

[0099] When the glass of this embodiment is used as architectural window glass, the shape of the glass of this embodiment is not particularly limited, but the area of ​​the main surface is preferably 0.04 m ２ More than 0.09 m is preferable. ２ More preferably, 0.25 m or more ２ More preferably, 0.45 m or more ２ The above is particularly preferable. When the area of ​​the glass is within the above range, it can be used for various types of window glass. Furthermore, if the area of ​​the glass is too large, it becomes difficult to handle, the temperature distribution during heating becomes uneven, the dimensional accuracy after bending becomes poor, and so on, making bending more difficult. Therefore, the glass of this embodiment is designed so that the area of ​​the main surface is within 10 m ２ Preferably less than 7m ２ Less than 5m is more preferable. ２ The following is even more preferred:

[0100] When the glass of this embodiment is used as a cover glass for LiDAR, it is preferable that the glass of this embodiment has high transmittance at wavelengths of 905 nm or 1550 nm, which are wavelengths used in LiDAR. Therefore, the glass of this embodiment has a transmittance at wavelengths of 905 nm or 1550 nm, when converted to a thickness of 4.0 mm, of preferably 86% or more, more preferably 87% or more, even more preferably 88% or more, even more preferably 89% or more, particularly preferably 90% or more, and most preferably 91% or more.

[0101] When the glass of this embodiment is used as a cover glass for a sensor, the shape of the glass of this embodiment is not particularly limited, but the area of ​​the main surface is preferably 0.00010 m ２More than 0.010 m is preferable. ２ More preferably, 0.020 m or more ２ More preferably, 0.040 m or more ２ More than 0.090 m is particularly preferable. ２ The above is most preferable. When the glass area is within the above range, it can be used as a cover glass for various LiDARs. Furthermore, if the glass area is too large, the temperature distribution during heating becomes uneven, the dimensional accuracy after bending becomes poor, and so on, making bending more difficult. Therefore, the glass of this embodiment has a main surface area of ​​1.0 m ２ Preferably less than 0.90 m ２ Less than 0.80 m is more preferable. ２ The following is even more preferred:

[0102] (Thickness) The glass of this embodiment preferably has a thickness of 0.70 mm or more. A glass thickness of 0.70 mm or more can improve strength. The glass thickness is more preferably 1.0 mm or more, even more preferably 1.3 mm or more, even more preferably 1.5 mm or more, particularly preferably 1.8 mm or more, even more preferably 2.0 mm or more, still more preferably 2.1 mm or more, particularly preferably 2.3 mm or more, and most preferably 2.5 mm or more. Furthermore, from the viewpoint of suppressing increases in fuel economy and electricity consumption due to an increase in the weight of the glass, the thickness of the glass of this embodiment is preferably 5.0 mm or less, more preferably 4.8 mm or less, even more preferably 4.5 mm or less, particularly preferably 4.2 mm or less, and most preferably 4.0 mm or less.

[0103] Examples of methods for adjusting the thickness of the glass include a method of adjusting the thickness of the glass using the float method or down-draw method described below, and a method of polishing the glass in the thickness direction using a grinding stone and then polishing it to a mirror finish using an abrasive such as cerium oxide. The surface roughness Ra after molding or polishing is preferably 5.0 nm or less, more preferably 2.0 nm or less, even more preferably 1.5 nm or less, particularly preferably 1.0 nm or less, and most preferably 0.50 nm or less.

[0104] <Manufacturing Method> Methods for manufacturing the glass of the present embodiment include known forming methods, such as the float method, the roll-out method, and the down-draw method. The glass of the present embodiment may be glass that has been subjected to a tempering treatment by air-cooling tempering (physical tempering) or chemical tempering. That is, the glass of the present embodiment may be physically tempered glass or chemically tempered glass. By performing such treatment, the strength of the glass can be increased.

[0105] Here, air-cooling tempering is a process in which a compressive stress layer is formed on the surface of glass by thermal tempering. Specifically, uniformly heated glass is rapidly cooled from a temperature near its softening point, and compressive stress is formed on the surface of the glass due to the temperature difference between the surface and the interior of the glass. The compressive stress is generated uniformly over the entire surface of the glass, and a compressive stress layer of uniform depth is formed over the entire surface of the glass. Thermal tempering is more suitable for tempering thick glass than chemical tempering.

[0106] Chemical strengthening is a process in which alkali metal ions with a small ionic radius (typically Li ions or Na ions) on the surface of glass are exchanged with alkali metal ions with a larger ionic radius (typically Na ions or K ions) by ion exchange at a temperature below the glass transition temperature, thereby forming a compressive stress layer on the surface of the glass. Chemical strengthening can be performed by known methods, such as ion exchange. In the ion exchange method, a glass plate is immersed in a treatment solution (e.g., potassium nitrate molten salt) and ions with a small ionic radius (e.g., Na ions) contained in the glass are exchanged with ions with a large ionic radius (e.g., K ions), thereby generating compressive stress on the surface of the glass. The magnitude of the compressive stress on the surface of the glass (hereinafter also referred to as surface compressive stress CS) and the depth DOL of the compressive stress layer formed on the surface of the glass can be adjusted by the glass composition, chemical strengthening treatment time, and chemical strengthening treatment temperature, respectively.

[0107] [Bent Glass] The glass of the present embodiment may be bent glass. Bent glass is glass obtained by bending glass. Examples of methods for forming bent glass include gravity forming and press forming.

[0108] The curved glass of this embodiment is glass that curves at a predetermined curvature, and may be single-curved glass that curves in only one direction, either up and down or left and right, or double-curved glass that curves in both up and down and left and right directions.

[0109] <Laminated Glass> The laminated glass according to this embodiment includes a first glass plate, a second glass plate, and an interlayer film sandwiched between the first glass plate and the second glass plate, and the first glass plate and / or the second glass plate is the glass according to this embodiment.

[0110] FIG. 1 is a diagram showing an example of a laminated glass 10 according to the present embodiment. The laminated glass 10 includes a first glass sheet 11, a second glass sheet 12, and an interlayer film 13 sandwiched between the first glass sheet 11 and the second glass sheet 12. The laminated glass 10 according to the present embodiment is not limited to the configuration shown in FIG. 1 and can be modified without departing from the spirit of the present invention. For example, the interlayer film 13 may be formed of a single layer as shown in FIG. 1 or may be formed of two or more layers. The laminated glass 10 according to the present embodiment may also include three or more glass sheets, in which case an organic resin or the like may be interposed between adjacent glass sheets. Hereinafter, the laminated glass 10 according to the present embodiment will be described as having only two glass sheets, a first glass sheet 11 and a second glass sheet 12, sandwiching the interlayer film 13.

[0111] In the laminated glass of the present embodiment, from the viewpoint of bend formability, the first glass sheet 11 and / or the second glass sheet 12 are preferably the glass of the present embodiment. When the first glass sheet 11 and the second glass sheet 12 are the glass of the present embodiment, the first glass sheet 11 and the second glass sheet 12 may be glass sheets having the same composition or different compositions.

[0112] In the laminated glass of this embodiment, when the first glass sheet 11 or the second glass sheet 12 is not the glass of this embodiment, the type of the glass sheet is not particularly limited, and any conventionally known glass sheet used for vehicle window glass, etc. can be used. Specific examples include alkali aluminosilicate glass, alkali aluminoborosilicate glass, and soda-lime glass. These glass sheets may or may not be colored to the extent that transparency is not impaired.

[0113] The thickness of the first glass plate 11 is preferably 1.5 mm or more. Having a thickness of 1.5 mm or more of the first glass plate 11 improves the durability of the glass. The thickness of the first glass plate 11 is more preferably 1.8 mm or more, even more preferably 2.0 mm or more, even more preferably 2.1 mm or more, particularly preferably 2.3 mm or more, even more preferably 2.5 mm or more, still more preferably 2.8 mm or more, particularly preferably 3.0 mm or more, and most preferably 3.3 mm or more. Furthermore, from the viewpoint of suppressing increases in fuel economy and electricity consumption due to an increase in the weight of the glass, the thickness of the first glass plate 11 is preferably 5.0 mm or less, more preferably 4.8 mm or less, even more preferably 4.5 mm or less, particularly preferably 4.2 mm or less, and most preferably 4.0 mm or less.

[0114] The thickness of the second glass plate 12 is preferably 0.7 mm or more, more preferably 0.9 mm or more, even more preferably 1.0 mm or more, particularly preferably 1.3 mm or more, particularly preferably 1.5 mm or more, and most preferably 1.8 mm or more. A thickness of 0.7 mm or more is preferable from the viewpoint of impact resistance. Furthermore, the thickness of the second glass plate 12 is preferably 3.0 mm or less, more preferably 2.8 mm or less, even more preferably 2.6 mm or less, particularly preferably 2.4 mm or less, particularly preferably 2.2 mm or less, and most preferably 2.0 mm or less. A thickness of 3.0 mm or less of the second glass plate 12 prevents the weight of the laminated glass 10 from becoming too large, which is preferable from the viewpoint of improving fuel efficiency when used in a vehicle.

[0115] Furthermore, the first glass plate 11 and the second glass plate 12 may have the same thickness or different thicknesses, but it is preferable that the first glass plate 11 be thicker than the second glass plate 12. That is, the relationship between the thickness t1 of the first glass plate 11 and the thickness t2 of the second glass plate 12 is preferably t1≧t2, and more preferably t1>t2.

[0116] Methods for adjusting the thickness of the first glass sheet 11 and the second glass sheet 12 include adjusting the thickness of the glass using a float method or a down-draw method, or polishing the glass in the thickness direction with a grinding stone and then polishing it to a mirror finish with an abrasive such as cerium oxide. The surface roughness Ra after molding or polishing is preferably 5.0 nm or less, more preferably 2.0 nm or less, even more preferably 1.5 nm or less, particularly preferably 1.0 nm or less, and most preferably 0.50 nm or less.

[0117] In the laminated glass 10 of this embodiment, the thickness of the first glass sheet 11 and the second glass sheet 12 may be constant over the entire surface, or may vary from location to location as needed, such as forming a wedge shape in which the thickness of one or both of the first glass sheet 11 and the second glass sheet 12 gradually decreases.

[0118] The first glass plate 11 or the second glass plate 12 may be chemically strengthened glass that has been subjected to glass strengthening to improve its strength. The chemical strengthening method is the same as the chemical strengthening method for glass described above. Examples of chemically strengthened glass include the alkali aluminosilicate glass and the alkali aluminoborosilicate glass that have been chemically strengthened.

[0119] The first glass sheet 11 and the second glass sheet 12 may have a flat shape or a curved shape having a curvature entirely or partially. If the first glass sheet 11 and the second glass sheet 12 are curved, they may have a single-curve shape, i.e., a curved shape in only one direction, either the vertical or horizontal direction, or a complex-curve shape, i.e., a curved shape in both the vertical and horizontal directions. If the first glass sheet 11 and the second glass sheet 12 are curved, the radius of curvature in the vertical and horizontal directions may be the same or different. If the first glass sheet 11 and the second glass sheet 12 are curved, the radius of curvature in the vertical and / or horizontal directions is preferably 1000 mm or more. The shapes of the main surfaces of the first glass sheet 11 and the second glass sheet 12 are configured to fit the window opening of the vehicle in which they are installed.

[0120] The interlayer film 13 is sandwiched between the first glass sheet 11 and the second glass sheet 12. By including the interlayer film 13, the laminated glass 10 of this embodiment can firmly bond the first glass sheet 11 and the second glass sheet 12 together and can also absorb the impact force when flying fragments collide with the glass sheets.

[0121] Various organic resins that are generally used in laminated glass for conventional vehicles can be used for the interlayer film 13. Examples of organic resins include polyethylene (PE), ethylene vinyl acetate copolymer (EVA), polypropylene (PP), polystyrene (PS), methacrylic resin (PMA), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), cellulose acetate (CA), diallyl phthalate resin (DAP), urea resin (UP), melamine resin (MF), unsaturated polyester (UP), polyvinyl butyral (PVB), and polyvinyl formalin. Examples of materials that can be used include polyvinyl alcohol (PVF), polyvinyl alcohol (PVAL), vinyl acetate resin (PVAc), ionomer (IO), polymethylpentene (TPX), polyvinylidene chloride (PVDC), polysulfone (PSF), polyvinylidene fluoride (PVDF), methacrylic-styrene copolymer resin (MS), polyarate (PAR), polyallylsulfone (PASF), polybutadiene (BR), polyethersulfone (PESF), and polyetheretherketone (PEEK). Among these, EVA and PVB are preferred from the viewpoints of transparency and adhesion, and PVB is particularly preferred because it can impart sound insulation properties.

[0122] From the viewpoints of impact force absorption and sound insulation, the thickness of the interlayer film 13 is preferably 0.300 mm or more, more preferably 0.500 mm or more, and even more preferably 0.700 mm or more. From the viewpoint of suppressing a decrease in visible light transmittance, the thickness of the interlayer film 13 is preferably 1.00 mm or less, more preferably 0.900 mm or less, and even more preferably 0.800 mm or less. The thickness of the interlayer film 13 is preferably in the range of 0.300 mm to 1.00 mm, and more preferably in the range of 0.700 mm to 0.800 mm.

[0123] The thickness of the intermediate film 13 may be constant over the entire surface, or may vary from place to place as required.

[0124] If the difference in linear expansion coefficient between the interlayer film 13 and the first glass sheet 11 or the second glass sheet 12 is large, cracks or warping may occur in the laminated glass 10 when the laminated glass 10 is produced through the heating step described below, which may result in poor appearance. Therefore, it is preferable that the difference in linear expansion coefficient between the interlayer film 13 and the first glass sheet 11 or the second glass sheet 12 is as small as possible. The difference in linear expansion coefficient between the interlayer film 13 and the first glass sheet 11 or the second glass sheet 12 may be expressed as the difference between the average linear expansion coefficients within a predetermined temperature range.

[0125] In particular, since the resin constituting the interlayer film 13 has a low glass transition temperature, a predetermined difference in the average linear expansion coefficient may be set within a temperature range below the glass transition temperature of the resin material. Note that the difference in the linear expansion coefficient between the first glass sheet 11 or the second glass sheet 12 and the resin material may be set at a predetermined temperature below the glass transition temperature of the resin material.

[0126] Alternatively, an adhesive layer containing an adhesive may be used for interlayer film 13. The adhesive is not particularly limited, but examples thereof include an acrylic adhesive, a silicone adhesive, etc. When interlayer film 13 is an adhesive layer, a heating step is not required in the process of joining first glass plate 11 and second glass plate 12, and therefore the risk of the above-mentioned cracking or warping occurring is reduced.

[0127] [Other Layers] The laminated glass 10 of the present embodiment may include layers (hereinafter also referred to as "other layers") other than the first glass sheet 11, the second glass sheet 12, and the interlayer film 13, provided that the effects of the present embodiment are not impaired. For example, the laminated glass 10 may include a coating layer that imparts water-repellent properties, hydrophilic properties, anti-fogging properties, or the like, an infrared reflective film, or the like.

[0128] The positions at which the other layers are provided are not particularly limited, and the other layers may be provided on the surface of the laminated glass 10, or may be sandwiched between the first glass sheet 11, the second glass sheet 12, or the interlayer film 13. The laminated glass 10 of this embodiment may also include a black ceramic layer or the like arranged in a strip shape along part or all of the peripheral edge for the purpose of concealing the attachment portion to the frame or the wiring conductors.

[0129] The total thickness of the first glass plate 11, the second glass plate 12, and the interlayer film 13 is preferably 2.5 mm or more. In particular, when the laminated glass of this embodiment has the above-mentioned properties, the total thickness of the first glass plate 11, the second glass plate 12, and the interlayer film 13 is preferably 2.5 mm or more. A total thickness of 2.5 mm or more can improve sound insulation. The total thickness is more preferably 3.0 mm or more, even more preferably 3.5 mm or more, even more preferably 4.0 mm or more, particularly preferably 4.5 mm or more, and most preferably 5.0 mm or more. Furthermore, from the viewpoint of weight reduction, the total thickness is preferably 9.0 mm or less, more preferably 8.5 mm or less, even more preferably 8.0 mm or less, particularly preferably 7.5 mm or less, particularly preferably 7.0 mm or less, and most preferably 6.5 mm or less. When the total thickness of the first glass plate 11, the second glass plate 12, and the interlayer film 13 varies depending on the location, it is preferable that the total thickness at the thinnest location be 2.5 mm or more.

[0130] When the laminated glass 10 of this embodiment is used as a window glass for a vehicle, the visible light transmittance Tv as defined in ISO-9050:2003 using a D65 light source is preferably 70% or more, more preferably 71% or more, and even more preferably 72% or more. Furthermore, Tv is, for example, 90% or less.

[0131] When used as a vehicle window glass, the laminated glass 10 of this embodiment preferably has a total solar transmittance (Tts) of 70% or less, as defined in ISO-13837:2008 Convention A and measured at a wind speed of 4 m / s. When the total solar transmittance (Tts) of the laminated glass 10 of this embodiment is 70% or less, sufficient heat-shielding properties are obtained. Tts is more preferably 68% or less, and even more preferably 66% or less. Furthermore, Tts is, for example, 55% or more.

[0132] The laminated glass 10 of this embodiment can be manufactured by a method similar to that of conventionally known laminated glass. For example, by laminating a first glass sheet 11, an interlayer film 13, and a second glass sheet 12 in this order and then subjecting them to a heating and pressurizing process, a laminated glass 10 is obtained in which the first glass sheet 11 and the second glass sheet 12 are bonded together via the interlayer film 13.

[0133] The method for manufacturing the laminated glass 10 of this embodiment may, for example, include a step of heating and shaping the first glass sheet 11 and the second glass sheet 12, followed by a step of inserting the interlayer film 13 between the first glass sheet 11 and the second glass sheet 12 and applying heat and pressure. By performing these steps, the laminated glass 10 may be configured such that the first glass sheet 11 and the second glass sheet 12 are joined together via the interlayer film 13.

[0134] [Uses] The glass of the present embodiment is for use in architecture, vehicles, or sensors, and more specifically, can be preferably used as window glass in architecture or vehicles, or as cover glass for sensors. In particular, the glass of the present embodiment has excellent durability and formability, and is suitable for window glass in architecture or vehicles, specifically, for components such as windshields, side glass, rear glass, and roof glass. From the same viewpoint, the glass can be particularly suitable for use as cover glass for sensors such as LiDAR, cameras, and millimeter-wave radar mounted on vehicles, or unmanned or manned eVTOLs (Electric Vertical Take-Off and Landing aircraft) such as drones.

[0135] An example of a specific application in which the glass of this embodiment is used as a window glass for a vehicle will be described below with reference to the drawings. Fig. 2 is a conceptual diagram showing a state in which a laminated glass 10 including the glass of this embodiment is installed in an opening 110 formed in the front of an automobile 100 and used as the window glass of the automobile. The laminated glass 10 used as the window glass of an automobile may have a housing (case) 120, which houses an information device or the like, attached to its surface on the interior side of the vehicle to ensure the driving safety of the vehicle.

[0136] The information device housed in the housing is a device that uses a camera, radar, etc. to prevent rear-end collisions with vehicles ahead, pedestrians, obstacles, etc., and to alert the driver to danger. For example, it is an information receiving device and / or information transmitting device, etc., and includes millimeter-wave radar, stereo cameras, infrared lasers, etc., which send and receive signals. The "signal" refers to electromagnetic waves including millimeter waves, visible light, infrared light, etc.

[0137] 3 is an enlarged view of the portion S in FIG. 2 and is a perspective view showing the portion of the laminated glass 10 of this embodiment where the housing 120 is attached. The housing 120 houses a millimeter-wave radar 201 and a stereo camera 202 as information devices. The housing 120 housing the information devices is usually attached on the outer side of the vehicle relative to the rearview mirror 150 and on the inner side of the vehicle relative to the laminated glass 10, but may also be attached to other portions.

[0138] 4 is a cross-sectional view taken along line Y-Y in FIG. 3 and perpendicular to the horizontal line. It is preferable that the first glass sheet 11 of the laminated glass 10 be disposed on the vehicle exterior side. This configuration allows for a lightweight windshield with excellent durability. Furthermore, because the glass of this embodiment has a low Young's modulus, it can be easily bent when manufacturing the windshield.

[0139] As described above, the present specification discloses the following configurations: 1. In terms of mass percentage based on oxides, SiO ２ 50% or more, Al ２ O ３ 0.10% or more, Bi ２ O ３ Total bismuth oxide (t-Bi ２ O ３ 2. Glass containing 0.0010% or more and 0.10% or less of SiO 2 , and 0.0010% or more and 0.10% or less of total copper oxide (t-CuO) converted to CuO. ２ :65~80%, Al ２ O ３ :0.10~7.0%, B ２ O ３:0.0~5.0%, MgO:0.0~20%, CaO:0.0~20%, SrO:0.0~20%, BaO:0.0~20%, Li ２ O: 0.0-20%, Na ２ O: 0.0-20%, K ２ O: 0.0~20%, Fe ２ O ３ Total iron oxides converted to R': 0.050 to 5.0% ２ 1. The glass according to 1 above, containing O: 10 to 20%, and RO: 5.0 to 20% (wherein RO is the total content of MgO, CaO, SrO and BaO, and R' is the total content of MgO, CaO, SrO and BaO). ２ O is Li ２ O, Na ２ O and K ２ 3. Mass percentage based on oxides: SiO ２ :65~80%, Al ２ O ３ :0.10~7.0%, B ２ O ３ :5.0~20%, MgO:0.0~20%, CaO:0.0~20%, SrO:0.0~20%, BaO:0.0~20%, Li ２ O: 0.0-20%, Na ２ O: 0.0-20%, K ２ O: 0.0~20%, Fe ２ O ３ Total iron oxides converted to R': 0.0050 to 5.0% ２ 1. The glass according to 1 above, containing O: 5.0 to 20% and RO: 0.0 to 20% (wherein RO is the total content of MgO, CaO, SrO and BaO, and R' ２ O is Li ２ O, Na ２ O and K ２ 4. Mass percentage based on oxides: SiO ２ : 75 to 85% Al ２ O ３ :0.10~5.0%B ２ O ３:5.0~20% MgO:0.0~5.0% CaO:0.0~5.0% SrO:0.0~5.0% BaO:0.0~5.0% Li ２ O: 0.0-5.0% Na ２ O: 0.0-5.0% K ２ O: 0.0-5.0% Fe ２ O ３ Total iron oxide converted to: 0.0050 to 5.0% R' ２ 1. The glass according to 1 above, containing O: 1.0 to 5.0% and RO: 0.0 to 5.0% (wherein RO is the total content of MgO, CaO, SrO and BaO, and R' ２ O is Li ２ O, Na ２ O and K ２ 5. The total content of Fe, O, and Fe2O in terms of mass percentage based on oxides. ２ O ３ Total iron oxide (t-Fe ２ O ３ 5. The glass according to any one of 1 to 4 above, containing, in mass percentage on an oxide basis, 0.010% or more and 0.10% or less of Fe. ２ O ３ Total iron oxide (t-Fe ２ O ３ 7. The glass according to any one of 1 to 4 above, containing more than 0.10% and 1.0% or less of Bi, expressed as a mass percentage based on oxides. ２ O ３ Total bismuth oxide (t-Bi ２ O ３ 7. The glass according to any one of 1 to 6 above, containing 0.010% or more of copper oxide (t-CuO) calculated as CuO, and 0.0080% or more of total copper oxide (t-CuO). 8. The glass according to any one of 1 to 7 above, having a ΔTv defined as follows: ΔTv: difference obtained by subtracting the visible light transmittance Tv of the glass sheet before irradiation from the visible light transmittance Tv of the glass sheet after irradiation with simulated sunlight for two hours. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２The glass plate is a glass plate prepared by melting the glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 9. The glass according to any one of 1 to 8 above, wherein, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 10 to 79%, ΔTuv defined below is −0.05% or less. ΔTuv: difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before irradiation from the ultraviolet transmittance Tuv of the glass plate after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is a glass plate prepared by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 10. The glass according to any one of 1 to 8 above, wherein, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 80 to 93%, ΔTuv defined below is 0.10% or more. ΔTuv: difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before irradiation from the ultraviolet transmittance Tuv of the glass plate after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is a glass plate prepared by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 11. The glass according to any one of 1 to 8 above, wherein, when the ultraviolet transmittance Tuv before irradiation with simulated sunlight is 80 to 93%, ΔTuv defined below is −0.35% or less. ΔTuv: difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before irradiation from the ultraviolet transmittance Tuv of the glass plate after 2 hours of irradiation with the simulated sunlight. The simulated sunlight is irradiated at an air mass of 1.0 and an irradiation intensity of 300 W / m ２ The glass plate is a glass plate prepared by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 12. ΔC defined as follows: ＊ 12. The glass according to any one of 1 to 11 above, wherein the absolute value of ΔC is 0.07 or less. ＊ : Chroma C of the glass plate after 2 hours of irradiation with simulated sunlight ＊ From the above, the saturation C of the glass plate before the irradiation ＊ The pseudo-sunlight has an air mass of 1.0 and an irradiation intensity of 300 W / m２ The glass plate is a glass plate prepared by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm. 13. The glass as set forth in any one of 1 to 12 above, which is physically tempered glass or chemically tempered glass. 14. A vehicle window glass comprising the glass as set forth in any one of 1 to 13 above. 15. An architectural window glass comprising the glass as set forth in any one of 1 to 13 above. 16. A glass for a sensor comprising the glass as set forth in any one of 1 to 13 above. 17. A laminated glass comprising a first glass plate, a second glass plate, and an interlayer film sandwiched between the first glass plate and the second glass plate, wherein at least one of the first glass plate and the second glass plate is the glass as set forth in any one of 1 to 13 above.

[0140] The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

[0141] <Preparation of Glass Plates of Examples 1 to 19> Raw materials were placed in a platinum crucible and melted at a temperature of 1600°C to 1650°C for 3 hours to obtain molten glass so as to obtain the glass compositions (unit: wt%) shown in Tables 1 to 4. ２ O ３ " is Fe ２ O ３ The total iron oxide content is expressed as a percentage of iron oxide content. The molten glass was poured onto a carbon plate and slowly cooled. Both surfaces of the obtained glass plate were polished to obtain a glass plate having a thickness of 2.00 mm. Examples 4, 8, 10, 12, 14, and 19 are working examples, and Examples 1 to 3, 5 to 7, 9, 11, 13, and 15 to 18 are comparative examples.

[0142] The glass plates obtained above were subjected to the following evaluations, and the results are shown in Tables 1 to 4 below.

[0143] (1) Glass transition temperature (T ｇ ): Values ​​measured using TMA and determined in accordance with JIS R3103-3 (2001).

[0144] (2) Temperature T １１ Viscosity η, which is the standard for glass bending workability, is 10 １１ Temperature T when viscosity becomes dPa s １１was measured by the beam bending method.

[0145] (3) Average coefficient of linear expansion (CTE) from 50 to 350 °C ５０－３５０ ): Measured using a differential thermal dilatometer (TMA) and determined in accordance with JIS R3102 (1995).

[0146] (4) Density: A glass block of about 20 g containing no bubbles cut out from a glass plate was measured by Archimedes' method.

[0147] (5) Young's modulus: Measured at 25° C. by an ultrasonic pulse method (Olympus, DL35) based on JIS R1602:1995 "Testing method for elastic modulus of fine ceramics."

[0148] (6) Rigidity Modulus: Measured at 25° C. by an ultrasonic pulse method (Olympus, DL35) based on JIS R1602:1995 "Testing Method for Elastic Modulus of Fine Ceramics."

[0149] (7) Poisson's ratio: Measured at 25° C. by an ultrasonic pulse method (Olympus, DL35) based on JIS R1602:1995 "Testing method for elastic modulus of fine ceramics."

[0150] (8) The light was irradiated with a Tv D65 light source, and the calculation was performed using the standard spectral distribution of solar radiation in accordance with the provisions of JIS-R3106:1998. The irradiation intensity was 300 W / m at an air mass of 1.0 from a solar simulator [a tabletop xenon accelerated weathering tester manufactured by Atlas: SUNTEST (registered trademark) CPS+] set at 40°C. ２ The difference ΔTv was calculated by subtracting the Tv before irradiation from the Tv after irradiating the glass with simulated sunlight of 1000 nm for 2 hours. Tv was measured using a spectrophotometer LAMBDA 950 manufactured by Perkinelmer.

[0151] (9) Tuv: Calculated in accordance with the provisions of ISO 9845A:1992. Tuv was measured using a Perkinelmer LAMBDA 950 spectrophotometer. The irradiance was measured at an air mass of 1.0 and an irradiation intensity of 300 W / m from a solar simulator (a tabletop xenon accelerated weathering tester manufactured by Atlas: SUNTEST (registered trademark) CPS+) set at 40°C. ２The difference ΔTuv was calculated by subtracting the Tuv before irradiation from the Tuv after the glass was irradiated with the simulated sunlight of 10 ...

[0152] (10) Optical properties (a ＊ , b ＊ , C ＊ ) Chromaticity L defined in JIS Z 8781-4:2013 using a D65 light source ＊ , a ＊ , b ＊ The obtained a ＊ , b ＊ Substituting the value of into the following formula, C ＊ I asked. C ＊ = {(a ＊ ) ２ +(b ＊ ) ２} １／２ a ＊ , b ＊ and C ＊ The solar simulator [tabletop xenon accelerated weathering tester manufactured by Atlas: SUNTEST (registered trademark) CPS+] was set at 40°C and the irradiation intensity was 300 W / m at an air mass of 1.0. ２ Δa is the difference obtained by subtracting the values ​​before and after irradiating the glass with simulated sunlight for 2 hours. ＊ , Δb ＊ and ΔC ＊ asked for.

[0153]

[0154]

[0155]

[0156]

[0157] As shown in Table 1, Examples 4, 8, and 10, which are working examples, showed a greater decrease in ultraviolet transmittance due to solarization caused by sunlight than Comparative Examples 1 to 3, 5 to 7, and 9. This is thought to be why glass of this embodiment can suppress damage to the interlayer film caused by sunlight, particularly when used in laminated glass.

[0158] As shown in Table 2, it was found that Example 12, which is an embodiment, can increase the visible light transmittance and ultraviolet light transmittance through solarization by sunlight, compared to Comparative Example 11. This suggests that glass of this embodiment is suitable for applications requiring high transmittance.

[0159] As shown in Table 3, it was found that Example 14, which is an embodiment, can increase the visible light transmittance and ultraviolet light transmittance by solarization due to sunlight, compared to Examples 13 and 15, which are comparative examples.

[0160] As shown in Table 4, Example 19, which is an embodiment, has an increased visible light transmittance due to solarization by sunlight, and has a C ＊ Therefore, it is believed that the glass of this embodiment is suitable for applications requiring high transmittance, particularly for automotive glass.

[0161] 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. 2023-223476) filed on December 28, 2023, the entirety of which is incorporated by reference. All references cited herein are incorporated in their entirety.

[0162] REFERENCE SIGNS LIST 10 Laminated glass 11 First glass sheet 12 Second glass sheet 13 Interlayer 100 Automobile 110 Opening 120 Housing 150 Rearview mirror 201 Millimeter wave radar 202 Stereo camera 300 Radio wave

Claims

1. In terms of mass percentage representation based on oxides, SiO ２ is 50% or more, Al ２ O ３ is 0.10% or more, total bismuth oxide (t-Bi ２ O ３ ), converted to Bi ２ O ３ ２ ３ is 0.0010% or more and 0.10% or less, and total copper oxide (t-CuO), converted to CuO, is 0.0010% or more and 0.10% or less. A glass containing these components.

2. In terms of mass percentage based on oxides, SiO ２ : 65 to 80%, Al ２ O ３ : 0.10 to 7.0%, B ２ O ３ : 0.0 to 5.0%, MgO: 0.0 to 20%, CaO: 0.0 to 20%, SrO: 0.0 to 20%, BaO: 0.0 to 20%, Li ２ O: 0.0 to 20%, Na ２ O: 0.0 to 20%, K ２ O: 0.0 to 20%, total iron oxide converted to Fe ２ O ３ : 0.050 to 5.0%, R' ２ O: 10 to 20%, RO: 5.0 to 20% contained. The glass according to claim 1. (However, RO is the total content of MgO, CaO, SrO and BaO, and R' ２ O is the total content of Li ２ O, Na ２ O and K ２ O.) 3. In terms of mass percentage based on oxides, SiO ２ : 65 to 80%, Al ２ O ３ : 0.10 to 7.0%, B ２ O ３ : 5.0 to 20%, MgO: 0.0 to 20%, CaO: 0.0 to 20%, SrO: 0.0 to 20%, BaO: 0.0 to 20%, Li ２ O: 0.0 to 20%, Na ２ O: 0.0 to 20%, K ２ O: 0.0 to 20%, total iron oxide converted to Fe ２ O ３ : 0.0050 to 5.0%, R' ２ O: 5.0 to 20%, RO: 0.0 to 20%. The glass according to claim 1 contains (where RO is the total content of MgO, CaO, SrO and BaO, and R' ２ O is the total content of Li ２ O, Na ２ O and K ２ O).

4. In terms of mass percentage based on oxides, SiO ２ : 75 to 85%, Al ２ O ３ : 0.10 to 5.0%, B ２ O ３ : 5.0 to 20%, MgO: 0.0 to 5.0%, CaO: 0.0 to 5.0%, SrO: 0.0 to 5.0%, BaO: 0.0 to 5.0%, Li ２ O: 0.0 to 5.0%, Na ２ O: 0.0 to 5.0%, K ２ O: 0.0 to 5.0%, Fe ２ O ３ Total iron oxide converted to: 0.0050 to 5.0%, R' ２ O: 1.0 to 5.0%, RO: 0.0 to 5.0% contained, the glass according to claim 1. (However, RO is the total content of MgO, CaO, SrO and BaO, and R' ２ O is the total content of Li ２ O, Na ２ O and K ２ O.) 5. In terms of mass percentage based on oxide, Fe ２ O ３ Total iron oxide (t-Fe ２ O ３ The glass according to any one of claims 1 to 4, containing 0.010% or more and 0.10% or less of 6. In terms of mass percentage based on oxides, the glass according to any one of claims 1 to 4 contains more than 0.10% and at most 1.0% of total iron oxide (t-Fe ２ O ３ ), converted to ２ O ３ ).

7. In terms of mass percentage based on oxides, the total bismuth oxide (t-Bi ２ O ３ ) converted to ２ O ３ is 0.010% or more, and the total copper oxide (t-CuO) converted to CuO is 0.0080% or more. The glass according to any one of claims 1 to 6.

8. The glass according to any one of claims 1 to 7, wherein ΔTv defined below is 0.010% or more. ΔTv: The difference obtained by subtracting the visible light transmittance Tv of the glass plate before the irradiation from the visible light transmittance Tv of the glass plate after irradiating with simulated sunlight for 2 hours. The simulated sunlight is simulated sunlight with an air mass of 1.0 and an irradiation intensity of 300 W / m ２ 2. The glass plate is obtained by melting the glass at 1650 °C, gradually cooling it, and polishing it to a thickness of 2.00 mm.

9. When the ultraviolet transmittance Tuv before the simulated sunlight irradiation is 10 to 79%, the glass according to any one of claims 1 to 8, wherein ΔTuv defined below is -0.05% or less. ΔTuv: The difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before the irradiation from the ultraviolet transmittance Tuv of the glass plate after irradiating the simulated sunlight for 2 hours. The simulated sunlight is simulated sunlight with an irradiation intensity of 300 W / m ２ at an air mass of 1.

0. The glass plate is a glass plate obtained by melting glass at 1650°C, gradually cooling it, and polishing it to a thickness of 2.00 mm.

10. When the ultraviolet transmittance Tuv before the simulated sunlight irradiation is 80 to 93%, the glass according to any one of claims 1 to 8, wherein ΔTuv defined below is 0.10% or more. ΔTuv: The difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before the irradiation from the ultraviolet transmittance Tuv of the glass plate after irradiating the simulated sunlight for 2 hours. The simulated sunlight is simulated sunlight with an irradiation intensity of 300 W / m at an air mass of 1.0 ２ shall be used. The glass plate is a glass plate obtained by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm.

11. The glass according to any one of claims 1 to 8, wherein when the ultraviolet transmittance Tuv before the simulated sunlight irradiation is 80 to 93%, ΔTuv defined below is -0.35% or less. ΔTuv: The difference obtained by subtracting the ultraviolet transmittance Tuv of the glass plate before the irradiation from the ultraviolet transmittance Tuv of the glass plate after irradiating the simulated sunlight for 2 hours. The simulated sunlight is simulated sunlight with an irradiation intensity of 300 W / m at air mass 1.0 ２ shall be used. The glass plate is a glass plate obtained by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm.

12. ΔC defined below ＊ The glass according to any one of claims 1 to 11, wherein the absolute value of is 0.07 or less. ΔC ＊ : The chroma C of the glass plate after irradiating with simulated sunlight for 2 hours ＊ minus the chroma C of the glass plate before the irradiation. The simulated sunlight is simulated sunlight with an irradiation intensity of 300 W / m ＊ at an air mass of 1.

0. ２ ​ The glass plate is a glass plate obtained by melting glass at 1650°C, slowly cooling it, and polishing it to a thickness of 2.00 mm.

13. The glass according to any one of claims 1 to 12, which is physically strengthened glass or chemically strengthened glass.

14. A vehicle window glass comprising the glass according to any one of claims 1 to 13.

15. An architectural window glass comprising the glass according to any one of claims 1 to 13.

16. A sensor glass comprising the glass according to any one of claims 1 to 13.

17. A laminated glass including a first glass plate, a second glass plate, and an intermediate film sandwiched between the first glass plate and the second glass plate, wherein at least one of the first glass plate and the second glass plate is the glass according to any one of claims 1 to 13.

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