Glass for buildings, vehicles, or sensors, and laminated glass

Abstract

To provide glass and laminated glass having excellent strength and formability. This glass for buildings, vehicles, or sensors contains, expressed in molar percentage based on oxides, SiO2, Al2O3, B2O3, MgO, CaO, SrO, BaO, Li2O, Na2O, K2O, Y2O3, total iron oxide converted to Fe2O3, SiO2 + Al2O3 + B2O3, R'2O, and RO, in specific ranges.

Description

Glass and laminated glass for buildings, vehicles, and sensors

[0001] The present invention relates to glass and laminated glass for architectural, vehicular or sensor applications.

[0002] Glass for architecture, vehicles, or sensors is used as a protective member for sensors or modules, for example, and when it is subjected to an instantaneous external impact due to a falling object or a stone flying while driving, the stress at the time of the impact is not alleviated and concentrated stress occurs, which may result in damage to the glass as a protective member, the sensor, or the module. Therefore, the glass is required to have excellent strength.

[0003] For example, Patent Document 1 discloses a sensor module using physically strengthened glass or chemically strengthened glass as a protective member, and Patent Document 2 describes a laminated glass for vehicles that is radio wave transparent and resistant to stone chips.

[0004] International Publication No. 2019 / 009336 International Publication No. 2021 / 220996

[0005] As described above, glass for buildings, vehicles, or sensors is required to have excellent strength. It is also considered to construct laminated glass as a means for improving stone chip resistance. When bending laminated glass to improve design and visibility, for example, it is difficult to simultaneously bend glass of different thicknesses to produce a laminated glass with a desired shape. Therefore, excellent formability is required.

[0006] In view of the above problems, an object of the present invention is to provide glass and laminated glass having excellent strength and formability.

[0007] 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.

[0008] That is, the present invention is as follows: 1. SiO in mole percentage on an oxide basis ２ : 60 to 68% Al ２ O ３ :1.5~5.0%B ２ O ３:0.0~5.0% MgO:0.0~10% CaO:10~20% SrO:0.0~10% BaO:0.0~5.0% Li ２ O: 0.0-10% Na ２ O: 0.0~20% K ２ O: 0.0~10%Y ２ O ３ :0.0~1.0% Fe ２ O ３ Total iron oxide converted to SiO ２ +Al ２ O ３ +B ２ O ３ : 62 to 70% R' ２ O: 14-20% RO: 10-20% (where RO is the total content of MgO, CaO, SrO and BaO, R' ２ O is Li ２ O, Na ２ O and K ２ 1. Glass for architecture, vehicles or sensors containing 1.0% or more of fluorine-containing compounds (a total content of 0). ３ 3. The glass according to 1 above, wherein the average linear expansion coefficient at 50 to 350°C is 95×10 －７ / ℃ or more 120 x 10 －７ 4. The glass according to 1 above, wherein K is 0.1 / °C or less. ２ O / R' ２ 4. The glass according to 1 above, wherein MgO / RO is 0.10 or more and SrO / RO is 0.10 or more. 5. The glass according to 1 above, wherein MgO / RO is 0.10 or more and SrO / RO is 0.10 or more. 6. The glass according to 1 above, wherein the glass is a bent formed glass. 7. The glass according to 1 above, wherein the glass is a physically strengthened glass. 8. The glass according to 1 above, wherein the fictive temperature is less than or equal to the glass transition temperature T ｇ +35)°C or higher and 570°C or higher and 700°C or higher. 9. Laminated glass comprising a first glass sheet, a second glass sheet, and an interlayer sandwiched between the first glass sheet and the second glass sheet, wherein the first glass sheet is the glass according to any one of 1 to 8. 10. The deformation points of the first glass sheet and the second glass sheet are each T Ａ , T Ｂ The absolute value of the difference when Ａ -TＢ | is 40°C or less. 11. The laminated glass according to claim 9, wherein the relationship between the thickness t1 of the first glass plate and the thickness t2 of the second glass plate is t1 ≥ t2. 12. The laminated glass according to claim 11, wherein the thickness t1 of the first glass plate is 2.5 mm or more and the thickness t2 of the second glass plate is 1.5 mm or less. 13. A vehicle window glass comprising the laminated glass according to claim 9. 14. An architectural window glass comprising the laminated glass according to claim 9. 15. A glass for a sensor comprising the laminated glass according to claim 9.

[0009] According to the present invention, glass for buildings, vehicles or sensors, bent glass, tempered glass and laminated glass having excellent strength and formability can be provided.

[0010] 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.

[0011] 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.

[0012] Hereinafter, the glass of this embodiment will be described as an embodiment of the glass for architecture, vehicles or sensors (hereinafter, sometimes simply referred to as "glass") of the present invention. The glass of this embodiment contains, in terms of oxide-based mole percentage, SiO ２ : 60 to 68% Al ２ O ３ :1.5~5.0%B ２ O ３:0.0~5.0% MgO:0.0~10% CaO:10~20% SrO:0.0~10% BaO:0.0~5.0% Li ２ O: 0.0-10% Na ２ O: 0.0~20% K ２ O: 0.0~10%Y ２ O ３ :0.0~1.0% Fe ２ O ３ Total iron oxide converted to SiO ２ +Al ２ O ３ +B ２ O ３ : 62 to 70% R' ２ O: 14-20% RO: 10-20% (where RO is the total content of MgO, CaO, SrO and BaO, R' ２ O is Li ２ O, Na ２ O and K ２ The glass for architecture, vehicles or sensors contains a total of 100% by weight of SiO 2 .

[0013] [Glass Composition] Unless otherwise specified, the composition range of each component is expressed in mole percent based on the oxide. Furthermore, the phrase "substantially free of" each component means that the component is not contained except as an unavoidable impurity mixed in from raw materials, etc., that is, the component is not intentionally contained.

[0014] 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 glass of this embodiment, the content of SiO ２ When the content of SiO is 60% or more, the density of the glass can be easily reduced, and further, moisture resistance and chemical durability can be ensured. Furthermore, the viscosity of the glass can be reduced. ２ The content of SiO is more preferably 61% or more, further preferably 62% or more, and particularly preferably 63% or more. ２By making the content of SiO 68% or less, the average linear expansion coefficient is prevented from increasing, an increase in viscosity during glass melting is suppressed, glass production becomes easier, and the formability of vehicle glass, particularly windshields and cover glass for sensors, etc. is improved. ２ The content is preferably 67% or less, more preferably 66% or less, and particularly preferably 65% ​​or less.

[0015] Al ２ O ３ is a component that constitutes the network structure of the glass and is an essential component of the glass of this embodiment. ２ O ３ In the glass of this embodiment, the content of Al is 1.5 to 5.0%. ２ O ３ By setting the Al content to 1.5% or more, the Young's modulus can be increased. In addition, the weather resistance, moisture resistance, and chemical durability are improved. Furthermore, the average linear expansion coefficient does not become too large, which can suppress thermal cracking of the glass, and also makes it possible to perform chemical strengthening treatment using ion exchange. ２ O ３ The content of Al is preferably 1.6% or more, more preferably 1.7% or more, even more preferably 1.8% or more, particularly preferably 1.9% or more, and most preferably 2.0% or more. ２ O ３ By making the content of Al 5.0% or less, an increase in viscosity during glass melting is suppressed, facilitating glass production, and also improving the formability of vehicle glass, particularly windshields and cover glass for sensors. ２ O ３ The content is preferably 4.5% or less, more preferably 4.0% or less, even more preferably 3.5% or less, and particularly preferably 3.0% or less.

[0016] 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 increases the density and the thermal expansion coefficient. ２ O ３The content of B is 0.0 to 5.0%. ２ O ３ By containing B, the viscosity and density of the glass can be reduced. ２ O ３ When B 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 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 is preferably 4.0% or less, more preferably 3.0% or less, and even more preferably 2.0% or less.

[0017] MgO is a component that reduces the viscosity of the glass and contributes to improving the Young's modulus. It also increases the density and thermal expansion coefficient. The MgO content in the glass of this embodiment is 0.0 to 10%. By including MgO in the glass of this embodiment, the viscosity of the glass can be reduced and the melting of glass raw materials can be promoted. Furthermore, it is possible to increase the Young's modulus and moisture resistance, as well as the density and thermal expansion coefficient. When MgO is included in the glass of this embodiment, the content is preferably 0.50% or more, more preferably 0.70% or more, even more preferably 1.0% or more, particularly preferably 1.2% or more, and most preferably 1.5% or more. Furthermore, if the MgO content in the glass of this embodiment is 10% or less, the glass is less susceptible to devitrification and an excessive increase in viscosity during glass melting is suppressed, facilitating glass production. Furthermore, the formability of vehicle glass, particularly windshields and cover glass for sensors, is improved. The MgO content is preferably 8.0% or less, more preferably 6.0% or less, even more preferably 5.0% or less, particularly preferably 4.0% or less, and most preferably 3.0% or less.

[0018] CaO is a component that reduces the viscosity of the glass. It is also a component that increases the density and thermal expansion coefficient. The CaO content in the glass of this embodiment is 10 to 20%. By making the CaO content in the glass of this embodiment 10% or more, the density and thermal expansion coefficient of the glass can be improved. The CaO content in the glass of this embodiment is preferably 11% or more, more preferably 12% or more, and particularly preferably 13% or more. Furthermore, by making the CaO content in the glass of this embodiment 20% or less, thermal cracking of the glass due to an increase in the average linear expansion coefficient can be suppressed. The CaO content in the glass of this embodiment is preferably 19% or less, more preferably 18% or less, even more preferably 17% or less, particularly preferably 16% or less, and most preferably 15% or less.

[0019] SrO is a component that reduces the viscosity of glass. It is also a component that increases the density and thermal expansion coefficient. The SrO content in the glass of this embodiment is 0.0 to 10%. Inclusion of SrO in the glass of this embodiment can improve the density and thermal expansion coefficient of the glass. When SrO is contained in the glass of this embodiment, the content is preferably 0.50% or more, more preferably 0.70% or more, even more preferably 1.0% or more, particularly preferably 1.2% or more, and most preferably 1.5% or more. In the glass of this embodiment, by limiting the SrO content to 10% or less, an increase in the density of the glass can be suppressed. In the glass of this embodiment, the SrO content is preferably 9.0% or less, more preferably 8.0% or less, even more preferably 7.0% or less, even more preferably 6.0% or less, particularly preferably 5.0% or less, and most preferably 4.0% or less.

[0020] BaO is a component that reduces the viscosity of the glass. The BaO content in the glass of this embodiment is 0.0 to 5.0%. 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. In the glass of this embodiment, the BaO content is preferably 4.0% or less, more preferably 3.0% or less, even more preferably 2.0% or less, even more preferably 1.0% or less, particularly preferably 0.5% or less, and most preferably substantially free of BaO. In the glass of this embodiment, "substantially free of BaO" means that the BaO content in the glass is 0.10 mol% or less. In the glass of this embodiment, when BaO is contained, 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.

[0021] In the glass of this embodiment, the total content of MgO, CaO, SrO, and BaO (hereinafter sometimes referred to as RO) is 10 to 20%. In the glass of this embodiment, by setting RO to 10% or more, the density, thermal expansion coefficient, and Young's modulus of the glass can be improved. RO is preferably 12% or more, more preferably 13% or more, even more preferably 14% or more, particularly preferably 15% or more, and most preferably 16% or more. In the glass of this embodiment, by setting RO to 20% or less, an increase in the density of the glass can be suppressed and the crack resistance of the glass can be improved. RO is preferably 19% or less, more preferably 18% or less, and particularly preferably 17% or less.

[0022] In the glass of this embodiment, MgO / RO is preferably 0.10 or more. In the glass of this embodiment, when MgO / RO is 0.10 or more, the devitrification temperature can be lowered. MgO / RO is more preferably 0.11 or more, and particularly preferably 0.12 or more. In the glass of this embodiment, the upper limit of MgO / RO is preferably 0.30 or less, more preferably 0.25 or less, even more preferably 0.20 or less, particularly preferably 0.18 or less, and most preferably 0.15 or less, from the viewpoint of suppressing decreases in density and average linear expansion coefficient.

[0023] In the glass of this embodiment, SrO / RO is preferably 0.10 or more. In the glass of this embodiment, when SrO / RO is 0.10 or more, the average linear expansion coefficient can be increased. SrO / RO is more preferably 0.11 or more, and even more preferably 0.12 or more. In the glass of this embodiment, in order to prevent the average linear expansion coefficient from becoming too large, SrO / RO is preferably 0.30 or less, more preferably 0.25 or less, even more preferably 0.20 or less, particularly preferably 0.18 or less, and most preferably 0.15 or less.

[0024] In one aspect of the glass of this embodiment, it is preferable that MgO / RO is 0.10 or more and SrO / RO is 0.10 or more. By having MgO / RO of 0.10 or more and SrO / RO of 0.10 or more, devitrification of the glass can be suppressed. In this aspect, MgO / RO is more preferably 0.11 or more, even more preferably 0.12 or more, and SrO / RO is more preferably 0.11 or more, even more preferably 0.12 or more.

[0025] Li ２ O is a component that improves the melting property of glass and reduces the 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 glass of this embodiment ２ The content of O is 0.0 to 10%. ２ By containing O, Na ２ O and K ２ It can reduce the viscosity of the glass compared to O. ２ The content of O is preferably 0.10% or more, more preferably 0.20% or more, even more preferably 0.30% or more, even more preferably 0.40% or more, and particularly preferably 0.50% or more. ２ By making the O content 10% 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 8.0% or less, more preferably 6.0% or less, even more preferably 4.0% or less, particularly preferably 3.0% or less, and most preferably 2.0% or less.

[0026] Na 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 glass. Furthermore, the strength of the glass can be increased by performing a chemical strengthening treatment by ion exchange with K ions. In the glass of this embodiment, Na ２ The content of O is 0.0 to 20%. ２ By containing 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 content of O is preferably 5.0% or more, more preferably 10% or more, even more preferably 11% or more, even more preferably 12% or more, particularly preferably 13% or more, particularly preferably 14% or more, and most preferably 15% or more. ２ By keeping the O content at 20% 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. ２ The O content is preferably 19% or less, more preferably 18% or less, further preferably 17% or less, and particularly preferably 16% or less.

[0027] K ２ O is a component that improves the meltability of the 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 The content of O is 0.0 to 10%. 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. ２When 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 O is Li ２ O and Na ２ Compared with O, K has the effect of increasing the average linear expansion coefficient and density. ２ By keeping the O content at 10% or less, thermal cracking of the glass due to an excessively large average linear expansion coefficient can be suppressed. ２ The O content is preferably 8.0% or less, more preferably 6.0% or less, even more preferably 5.0% or less, even more preferably 4.0% or less, particularly preferably 3.0% or less, and most preferably 2.0% or less.

[0028] In the glass of this 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 this embodiment, R' ２ When O is 14% or more, the Young's modulus increases and the viscosity of the glass decreases, thereby improving the moldability. ２ The content of O is preferably 15% or more, particularly preferably 16% or more. ２ If the O content is 20% or less, an increase in density can be suppressed and the moisture resistance of the glass can be further improved. ２ O is preferably 19% or less, particularly preferably 18% or less, and most preferably 17% or less.

[0029] The glass of this embodiment is K ２ O / R' ２ In the glass of this embodiment, K is preferably 0.50 or less. ２ O / R' ２ By making O 0.50 or less, it is possible to suppress the decrease in Young's modulus and rigidity modulus, and to ensure sufficient strength. ２ O / R' ２O is more preferably 0.40 or less, further preferably 0.30 or less, particularly preferably 0.20 or less, and most preferably 0.15 or less. ２ O / R' ２ The lower limit of O is not particularly limited, but it is preferably, for example, 0.01 or more.

[0030] 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 oxide content calculated as Fe is preferably 0.0030 to 0.50%. ２ O ３ The total iron oxide content converted to 100% is the total iron oxide content of FeO, which is an oxide of divalent iron, and Fe, which is an oxide of trivalent iron. ２ O ３ In the glass of this embodiment, Fe ２ O ３ When the total iron oxide content, calculated as Fe, is 0.0030% or more, heat insulation properties are improved, design properties are imparted, and heat is easily transferred to the glass during bending and forming of the glass, thereby improving formability. ２ O ３ By setting the total iron oxide content, calculated as % iron oxide, to 0.50% or less, it is possible to suppress a decrease in light transmittance in the visible range.

[0031] When the glass of this embodiment is used for architectural window glass, Fe is preferably used in order to improve heat insulation properties and provide design. ２ O ３ The total iron oxide content, calculated as Fe, is preferably 0.010% or more, more preferably 0.020% or more, particularly preferably 0.030% or more, and most preferably 0.040% or more. When the glass of this embodiment is used for architectural window glass, from the viewpoint of further suppressing the decrease in light transmittance in the visible range, Fe ２ O ３The total iron oxide content, calculated as % of iron oxide, is preferably 0.40% or less, more preferably 0.30% or less, even more preferably 0.25% or less, particularly preferably 0.20% or less, and most preferably 0.10% or less.

[0032] When the glass of this embodiment is used for a vehicle window glass, Fe is preferably used in order to improve heat insulation, provide design, and facilitate heat transfer to the glass during bending. ２ O ３ The total iron oxide content calculated as Fe is preferably 0.020% or more, more preferably 0.040% or more, even more preferably 0.080% or more, particularly preferably 0.12% or more, particularly preferably 0.16% or more, and most preferably 0.18% or more. When the glass of this embodiment is used for a window glass for a vehicle, Fe ２ O ３ From the viewpoint of further suppressing a decrease in light transmittance in the visible range, the total iron content converted into % is preferably 0.45% or less, more preferably 0.40% or less, even more preferably 0.35% or less, particularly preferably 0.30% or less, and most preferably 0.25% or less.

[0033] When the glass of this embodiment is used for a glass for a sensor (for example, a cover glass for a LiDAR or a camera), Fe is preferably used in order to facilitate melting of raw materials during glass production and to further reduce the amount of expensive high-purity raw materials used. ２ O ３ The total iron content calculated as a percentage of iron is more preferably 0.0030% or more, in the following order: 0.0032% or more, 0.0034% or more, 0.0036% or more is even more preferably 0.0038% or more, particularly preferably 0.0040% or more, and most preferably 0.0042% or more. ２ O ３ The total iron content, calculated as % iron, is more preferably 0.020% or less, further preferably 0.010% or less, even more preferably 0.0080% or less, particularly preferably 0.0070% or less, and most preferably 0.0060% or less.

[0034] The glass of this embodiment contains Fe ２ O３ Fe in total iron 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 15% or more. ２ O ３ Fe relative to the total iron content converted ２ O ３ Conversion Fe ２＋ The content ratio is 15% 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 molten glass 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 window glass and vehicle window glass.

[0035] When the glass of this embodiment is used for architectural window glass or vehicle window glass, the Fe-Redox is more preferably 20% or more, further preferably 22% or more, particularly preferably 24% or more, and is preferably 50% or less. By keeping the Fe-Redox content at 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.

[0036] When the glass of this embodiment is used for a sensor glass, the Fe-Redox is more preferably 16% or more, even more preferably 17% or more, particularly preferably 18% or more, and is preferably 35% or less. By keeping the Fe-Redox at 35% or less, a decrease in transmittance in the near-infrared region can be suppressed. The Fe-Redox is more preferably 32% or less, even more preferably 30% or less, particularly preferably 28% or less.

[0037] Fe-Redox can be adjusted by the raw material composition, melting temperature, and melting atmosphere. Fe-Redox can also be adjusted by using a reducing agent such as coke or ammonium chloride as a raw material to control the degree of oxidation-reduction of the glass melt.

[0038] [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.

[0039] 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 glass, vehicle 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 addition, 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.

[0040] The glass of this embodiment is ZrO ２ ZrO ２ is a component that improves chemical durability. ２When 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. ２ The 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.

[0041] 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.

[0042] 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.

[0043] 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 0.010% or more, more preferably 0.020% or more, further preferably 0.040% or more, and particularly preferably 0.070% or more. ２may absorb ultraviolet light, causing solarization and reducing transmittance in the visible range. ２ The content is preferably 0.25% or less, more preferably 0.18% or less, further preferably 0.14% or less, particularly preferably 0.10% or less.

[0044] 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 ３ When 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.

[0045] 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.

[0046] The glass of this embodiment is SO ３ SO ３acts 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 0.070% or less, more preferably 0.060% or less, further preferably 0.050% or less, and particularly preferably 0.040% or less.

[0047] 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. ２ The 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.

[0048] [Characteristics] (T ２ In the glass of this embodiment, the glass viscosity η, which is a criterion for the meltability of glass, is 10 ２ [dPa s] Temperature T ２ In the glass of the present embodiment, T ２ By keeping the temperature at 1450°C or less, the consumption of fuel used in melting the glass raw materials can be reduced, and the life of the brick members used in the melting furnace can be extended. ２ is more preferably 1425°C or less, even more preferably 1400°C or less, even more preferably 1380°C or less, particularly preferably 1360°C or less, and most preferably 1350°C or less. ２ As a method for lowering the temperature to 1450° C. or less, for example,２ The content of O and RO was increased, 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 ３ In the glass of this embodiment, a method of adjusting the content of T ２ By ensuring that the temperature is 1250°C or higher, deterioration in the weather resistance and chemical durability of the glass can be suppressed. ２ The temperature is preferably 1260°C or higher, more preferably 1270°C or higher, even more preferably 1280°C or higher, particularly preferably 1290°C or higher, and most preferably 1300°C or higher.

[0049] (T ４ In the glass of this embodiment, the glass viscosity η, which is the standard for formability during float forming, is 10 ４ [dPa s] Temperature T ４ In the glass of this embodiment, T ４ Since the temperature is 1200°C or less, it is suitable for forming into a plate by the float method. ４ is more preferably 1180°C or less, even more preferably 1170°C or less, even more preferably 1160°C or less, particularly preferably 1150°C or less, and most preferably 1140°C or less. ４ As a method for lowering the temperature to 1200° C. or less, for example, the R′ of the glass component 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 ３ In the glass of this embodiment, a method of adjusting the content of T ４ By ensuring that the temperature is 900°C or higher, deterioration in the weather resistance and chemical durability of the glass can be suppressed. ４The heating temperature is preferably 920°C or higher, more preferably 940°C or higher, even more preferably 960°C or higher, and particularly preferably 980°C or higher.

[0050] (T Ｌ The glass of this embodiment has a liquidus temperature T Ｌ In the glass of this embodiment, T Ｌ By making the temperature t 1200°C or less, it is possible to prevent devitrification from occurring when the glass is melted. Ｌ is more preferably 1175°C or less, even more preferably 1150°C or less, even more preferably 1125°C or less, particularly preferably 1100°C or less, and most preferably 1080°C or less. Ｌ As a method for lowering the temperature to 1200° C. or less, for example, the R′ of the glass component ２ Examples of the method include a method of adjusting the contents of O and RO, and a method of increasing the ratio of MgO or SrO among RO. Ｌ The lower limit of the temperature is not particularly limited, but is, for example, 800° C. or higher.

[0051] (T ｇ ) the glass transition temperature (T ｇ ) is preferably 500°C or higher and 580°C or lower. 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 T is 500°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 is prevented from becoming too large, thereby improving the weather resistance and chemical durability of the glass. In addition, devitrification of the glass is suppressed, and formability is improved. ｇ is more preferably 510° C. or higher, further preferably 520° C. or higher, and particularly preferably 530° C. or higher. From the viewpoint of preventing the bending temperature of the glass from becoming excessive and facilitating production, T ｇ is preferably 575°C or lower, more preferably 570°C or lower, even more preferably 565°C or lower, particularly preferably 560°C or lower, and most preferably 555°C or lower.

[0052] (virtual temperature T ｆ The glass of this embodiment has a fictive temperature T ｆ (glass transition temperature T ｇ The fictive temperature T is preferably equal to or higher than +35°C and equal to or higher than 570°C and equal to or lower than 700°C. ｆ If the fictive temperature T is within this predetermined temperature range, the strength of the glass can be increased while maintaining the bendability. ｆ (glass transition temperature T ｇ +35) ° C. or higher, and more preferably (glass transition temperature T ｇ +38) ° C. or higher, more preferably (glass transition temperature T ｇ +40) ° C. or higher, particularly preferably (glass transition temperature T ｇ +42) ° C. or higher, most preferably (glass transition temperature T ｇ +44)°C or higher. ｆ is preferably 570°C or higher, more preferably 575°C or higher, even more preferably 580°C or higher, even more preferably 585°C or higher, and particularly preferably 590°C or higher. ｆ The temperature is preferably 700°C or lower, more preferably 680°C or lower, even more preferably 660°C or lower, still more preferably 650°C or lower, particularly preferably 640°C or lower, and most preferably 630°C or lower.

[0053] The fictive temperature can be measured by a known method. More specifically, the fictive temperature T ｆ is obtained by the following steps 1) to 3). 1) First, i (i≧2) test pieces are prepared from a glass sample whose fictive temperature is to be measured, and each is held at a different cooling start temperature until the refractive index reaches equilibrium, and then cooled at a cooling rate of 1000°C / min or more. If the cooling start temperature is lower than the glass transition temperature, a sufficiently long holding time is required, so the cooling start temperature is preferably set to a temperature 10°C to 200°C higher than the glass transition temperature. 2) For the glass cooled under the conditions described in 1), the refractive index n ｄ Measure the respective cooling start temperatures Tｉ The refractive index n of the glass rapidly cooled from the cooling start temperature ｄｉ 3) Next, the fictive temperature T ｆ The refractive index n of a test piece cut out from the glass to be measured and polished is ｄ The fictive temperature T of the glass is measured using a calibration curve. ｆ Determine.

[0054] (Sag Point) The glass of this embodiment preferably has a sag point of 570°C or higher and 670°C or lower. Having a sag point of 570°C or higher in the glass of this embodiment prevents the average linear expansion coefficient of the glass from becoming too large, thereby improving the weather resistance and chemical durability of the glass and resulting in a glass with excellent manufacturability. The sag point is 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. Having a sag point of 670°C or lower in the glass of this embodiment results in excellent glass bending formability, as well as excellent device load and shape stability during bending form forming. The sag point is more preferably 665°C or lower, even more preferably 660°C or lower, even more preferably 655°C or lower, particularly preferably 650°C or lower, and most preferably 645°C or lower.

[0055] (Average Coefficient of Linear Expansion) The average coefficient of linear expansion (CTE) of the glass of this embodiment at 50 to 350°C is 95 × 10 －７ / ℃ or more 120 x 10 －７ In the glass of this embodiment, it is preferable that the average linear expansion coefficient is 120×10 －７ / °C or less, cracking due to heat shock can be suppressed when the glass is used as glass for vehicles, buildings, 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 118×10 －７ / °C or less is more preferable, and 116 x 10 －７ / °C or less is more preferable, and 114 × 10 －７ / °C or less is even more preferable, and 112 × 10 －７ / °C or less is particularly preferred, and 110 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, for example, it is most preferable that the glass has an average linear expansion coefficient of 95 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. Furthermore, adhesion to the mold during bending is improved, and bending is improved. The average linear expansion coefficient is 96 x 10 －７ / °C or more is more preferable, and 98 x 10 －７ / °C or more is more preferable, and 100 x 10 －７ / °C or more is particularly preferred, and 102 x 10 －７ / °C or more is particularly preferred, and 104 x 10 －７ / °C or more is particularly preferred, and 106 x 10 －７ To make the average linear expansion coefficient fall within the above range, the SiO ２ Increase the content of 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.

[0056] (Density) The glass of this embodiment has a density of 2.55 g / cm ３ 2.75g / cm or more ３ In the glass of this embodiment, the density is preferably 2.55 g / cm or less. ３ When the density is 2.57 g / cm or more, the glass is more likely to bend under its own weight during bending, improving bending formability. ３ More preferably, 2.60 g / cm ３ More preferably, 2.61 g / cm ３ or more, most preferably 2.62 g / cm ３ In the glass of this embodiment, the density is 2.75 g / cm ３By keeping the density at or below 2.73 g / cm, an increase in the weight of the glass can be suppressed, and an increase in fuel consumption and electricity consumption can be prevented. ３ More preferably, 2.70 g / cm or less ３ More preferably, 2.69 g / cm or less ３ Particularly preferably 2.68 g / cm ３ Below, most preferably 2.66 g / cm ３ The density can be measured by Archimedes' method.

[0057] (Young's Modulus) The Young's modulus of the glass of this embodiment is preferably 74 GPa or more. A Young's modulus of 74 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 75 GPa or more, even more preferably 76 GPa or more, particularly preferably 77 GPa or more, and most preferably 78 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 83 GPa or less, even more preferably 82 GPa or less, particularly preferably 81 GPa or less, and most preferably 80 GPa or less. In order to achieve a Young's modulus within the above range, the proportion of tetracoordinated boron, RO and R' are increased. 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."

[0058] (Rigidity Modulus) The rigidity modulus of the glass of this embodiment is preferably 27 GPa or more. If the rigidity modulus is 27 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 28 GPa or more, even more preferably 29 GPa or more, particularly preferably 30 GPa or more, and most preferably 31 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 38 GPa or less, more preferably 35 GPa or less, even more preferably 34 GPa or less, and particularly preferably 33 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."

[0059] (Poisson's ratio) The Poisson's ratio of the glass of this embodiment is preferably 0.28 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 0.27 or less, even more preferably 0.26 or less, particularly preferably 0.25 or less, and particularly preferably 0.24 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."

[0060] (Fracture toughness value K ＩＣ The glass of this embodiment has a fracture toughness value K measured by the DCDC (Double Cleavage Drilled Compression) method. ＩＣ is 0.76 MPa m １／２ The fracture toughness value K is preferably equal to or greater than the above. ＩＣ is an index of glass strength, and the fracture toughness value K ＩＣ The larger the fracture toughness value K, the more difficult it is for cracks to progress and the higher the resistance to cracking. ＩＣ is 0.76 MPa m １／２ If the fracture toughness value K is equal to or greater than this, sufficient resistance to cracking can be obtained, making the glass suitable for use as a window glass for vehicles or buildings, or a cover glass for sensors. ＩＣ is 0.77 MPa m １／２ More preferably, 0.78 MPa m １／２More preferably, 0.79 MPa m １／２ More preferably, 0.80 MPa m １／２ The above is most preferable. ＩＣ The upper limit is not particularly limited, but is, for example, 0.90 MPa m １／２ The fracture toughness value K ＩＣ is measured using the DCDC method.

[0061] In order to set the fracture toughness value within the above range, SiO ２ Increase the content of R', increase the proportion of alkaline earth metal components with small atomic numbers among RO, ２ O, especially R' ２ In particular, the proportion of alkali metal components with small atomic numbers in the O range can be increased. ２ Or B ２ O ３ Since R' (especially tetrahedral boron) is a component that forms a network structure, increasing its content strengthens the glass structure, thereby improving the fracture toughness value. Furthermore, the smaller the atomic number of the alkaline earth metal component in RO, the higher the Young's modulus, and as a result, the higher the fracture toughness value. ２ Regarding O, the smaller the atomic number of the alkali metal component, the more the tendency similar to that of RO is shown.

[0062] (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:

[0063] 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:

[0064] 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.

[0065] 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 ２ More 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 m２ Less than 0.80 m is more preferable. ２ The following is even more preferred:

[0066] (Thickness) The glass of the present embodiment preferably has a thickness of 2.5 mm or more. A glass thickness of 2.5 mm or more can improve strength. The glass thickness is more preferably 2.8 mm or more, even more preferably 2.9 mm or more, even more preferably 3.0 mm or more, particularly preferably 3.1 mm or more, even more preferably 3.2 mm or more, even more preferably 3.3 mm or more, particularly preferably 3.4 mm or more, and most preferably 3.5 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 the present 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.

[0067] 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.

[0068] <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 physically tempered glass. Physically tempered glass is glass that has been subjected to a physical tempering treatment, and the strength of the glass can be increased by performing this treatment.

[0069] Here, physical strengthening is a process of forming a compressive stress layer on the surface of glass by thermal strengthening. 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 strengthening is more suitable for strengthening thick glass than chemical strengthening.

[0070] The glass of this embodiment may be bent glass. Bent glass is glass that has been bent. Examples of methods for forming bent glass include gravity forming and press forming.

[0071] 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.

[0072] <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 is the glass according to this embodiment.

[0073] 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.

[0074] In the laminated glass of the present embodiment, from the viewpoint of bend formability, the first glass sheet 11 is 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.

[0075] 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.

[0076] In the laminated glass of this embodiment, the deformation points (°C) of the first glass sheet 11 and the second glass sheet 12 are respectively T Ａ , T Ｂ The absolute value of the difference when Ａ－ T Ｂ is preferably 40°C or less, more preferably 35°C or less, even more preferably 30°C or less, still more preferably 20°C or less, even more preferably 15°C or less, particularly preferably 10°C or less, and most preferably 5°C or less. Ａ－ T Ｂ By making | 40°C or less, the difference in the yield points can be kept below a certain temperature, and formability can be further improved. Ａ－ T Ｂ The lower limit of | is not particularly limited, but is, for example, 0° C. or higher.

[0077] The thickness of the first glass plate 11 is preferably 2.5 mm or more. Having a thickness of 2.5 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 2.6 mm or more, even more preferably 2.7 mm or more, even more preferably 2.8 mm or more, particularly preferably 2.9 mm or more, even more preferably 3.0 mm or more, even more preferably 3.1 mm or more, particularly preferably 3.2 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 4.6 mm or less, particularly preferably 4.4 mm or less, and most preferably 4.2 mm or less.

[0078] The thickness of the second glass plate 12 is preferably 0.30 mm or more, more preferably 0.40 mm or more, even more preferably 0.50 mm or more, particularly preferably 0.60 mm or more, particularly preferably 0.70 mm or more, and most preferably 0.80 mm or more. A thickness of 0.30 mm or more is preferable from the viewpoint of impact resistance. Furthermore, the thickness of the second glass plate 12 is preferably 1.5 mm or less, more preferably 1.4 mm or less, even more preferably 1.3 mm or less, particularly preferably 1.2 mm or less, particularly preferably 1.1 mm or less, and most preferably 1.0 mm or less. A thickness of 1.5 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] The thickness of the intermediate film 13 may be constant over the entire surface, or may vary from place to place as required.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] [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.

[0092] 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.

[0093] The total thickness of the first glass plate 11, the second glass plate 12, and the interlayer film 13 is preferably 3.5 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 3.5 mm or more. A total thickness of 3.5 mm or more can improve sound insulation. The total thickness is more preferably 4.0 mm or more, even more preferably 4.2 mm or more, even more preferably 4.4 mm or more, particularly preferably 4.6 mm or more, and most preferably 4.8 mm or more. Furthermore, from the viewpoint of weight reduction, the total thickness is preferably 8.0 mm or less, more preferably 7.5 mm or less, even more preferably 7.0 mm or less, particularly preferably 6.5 mm or less, particularly preferably 6.0 mm or less, and most preferably 5.8 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 3.5 mm or more.

[0094] The laminated glass of this embodiment has a thickness t １ and the thickness t of the second glass plate ２ The ratio (t １ / t ２ It is preferable that the ratio (t １ / t ２ When the ratio (t) is 1.7 or more, excellent formability and strength can be achieved. １ / t ２ ) is more preferably 2.0 or more, even more preferably 2.3 or more, even more preferably 2.5 or more, particularly preferably 2.7 or more, and most preferably 3.0 or more. In addition, in order to approximate the curvature when the glass after bending is made into laminated glass, the ratio (t １ / t２ ) is preferably 17 or less, more preferably 15 or less, even more preferably 10 or less, still more preferably 8.0 or less, particularly preferably 7.0 or less, and most preferably 6.0 or less.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] [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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] As described above, the present specification discloses the following configurations: 1. SiO in mole percentage on an oxide basis ２ : 60 to 68% Al ２ O ３ :1.5~5.0%B ２ O ３ :0.0~5.0% MgO:0.0~10% CaO:10~20% SrO:0.0~10% BaO:0.0~5.0% Li ２ O: 0.0-10% Na ２ O: 0.0~20% K ２ O: 0.0~10% Y ２ O ３ :0.0~1.0% Fe ２ O ３ Total iron oxide converted to SiO ２ +Al ２ O ３ +B ２ O ３ : 62 to 70% R' ２ O: 14-20% RO: 10-20% (where RO is the total content of MgO, CaO, SrO and BaO, R' ２ O is Li ２ O, Na ２ O and K ２1. Glass for architecture, vehicles or sensors containing 1.0% or more of fluorine-containing compounds (a total content of 0). ３ 3. The glass according to 1 above, wherein the average linear expansion coefficient at 50 to 350°C is 95×10 －７ / ℃ or more 120 x 10 －７ 3. The glass according to 1 or 2 above, wherein K is 0.1 / °C or less. ２ O / R' ２ 4. The glass according to any one of 1 to 3 above, wherein MgO / RO is 0.10 or more and SrO / RO is 0.10 or more. 5. The glass according to any one of 1 to 4 above, wherein MgO / RO is 0.10 or more and SrO / RO is 0.10 or more. 6. The glass according to any one of 1 to 5 above, which is a bent formed glass. 7. The glass according to any one of 1 to 5 above, which is a physically strengthened glass. 8. The glass according to any one of 1 to 5 above, which has a fictive temperature of (glass transition temperature T ｇ +35)°C or higher and 570°C or higher and 700°C or higher. 9. Laminated glass comprising a first glass sheet, a second glass sheet, and an interlayer sandwiched between the first glass sheet and the second glass sheet, wherein the first glass sheet is the glass according to any one of 1 to 8. 10. The deformation points of the first glass sheet and the second glass sheet are each T Ａ , T Ｂ The absolute value of the difference when Ａ -T Ｂ | is 40°C or less. 11. The laminated glass according to any one of 9 or 10 above, wherein the relationship between the thickness t1 of the first glass plate and the thickness t2 of the second glass plate is t1≧t2. 12. The laminated glass according to any one of 9 to 11 above, wherein the thickness t1 of the first glass plate is 2.5 mm or more and the thickness t2 of the second glass plate is 1.5 mm or less. 13. A vehicle window glass comprising the laminated glass according to any one of 9 to 12 above. 14. An architectural window glass comprising the laminated glass according to any one of 9 to 12 above. 15. A glass for a sensor comprising the laminated glass according to any one of 9 to 12 above.

[0105] The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

[0106] <Preparation of Glass Plates of Examples 1 to 14> Raw materials were placed in a platinum crucible and melted at a temperature of 1400°C to 1650°C for 3 hours to obtain molten glass so as to obtain the glass composition (unit: mol%) shown in Table 1. ２ O ３ " is Fe ２ O ３ The molten glass is poured onto a carbon plate and heated to a temperature above the glass transition temperature, T １１ The glass was maintained at the following temperature for 3 hours, and then slowly cooled at an average cooling rate of 1°C / min. Both surfaces of the obtained glass plate were polished to obtain a glass plate having a thickness of 3.0 mm. Examples 1 to 7 are working examples, and Examples 8 to 14 are comparative examples.

[0107] The glass plates obtained above were subjected to the following evaluations, and the results are shown in Table 1. In the table, blanks indicate unmeasured values, and values ​​in italics indicate calculated values.

[0108] (1) Temperature T ２ , temperature T ４ : The glass viscosity η, which is the standard for the melting property of glass, is 10 ２ Temperature T when viscosity becomes dPa s ２ and the glass viscosity η is 10 ４ Temperature T at which viscosity becomes dPa s ４ was measured using a rotational viscometer.

[0109] (2) Liquidus temperature (T Ｌ 5 g of glass gob cut from a glass plate was placed on a platinum dish and placed in an electric furnace at different temperatures higher than the glass transition point. After 17 hours, the dish was removed from the furnace and cooled. The presence or absence of precipitation on the surface and inside of the glass gob after cooling was checked, and the lowest temperature after 17 hours of holding the dish without precipitation of crystals was taken as the liquidus temperature.

[0110] (3) Glass transition temperature (T ｇ ): Values ​​measured using TMA and determined in accordance with JIS R3103-3 (2001).

[0111] (4) Fictive temperature (T ｆ ): Virtual temperature T ｆwas determined by the following steps 1) to 3). 1) First, i (i≧2) test pieces were prepared from a glass sample whose fictive temperature was to be measured. Each test piece was placed in an electric furnace and held at a different cooling start temperature (550°C, 575°C, 600°C, 625°C, 650°C, 675°C, or 700°C) until the refractive index reached equilibrium. Thereafter, each test piece was removed from the electric furnace to the outside of the furnace at room temperature of 25°C, and cooled from the cooling start temperature at a cooling rate of 1000°C / min or more. 2) For the glass cooled under the conditions described in 1), the refractive index n ｄ The respective cooling start temperatures T ｉ The refractive index n of the glass rapidly cooled from the cooling start temperature ｄｉ 3) Next, the fictive temperature T ｆ The refractive index n of a test piece cut out from the glass to be measured and polished is ｄ The fictive temperature T of the glass is measured using a calibration curve. ｆ It was decided that:

[0112] (5) Sagging Point Each glass was processed to prepare a glass rod having a diameter of 5 mm and a length of 20 mm. A thermal dilatometer (TD5000SA, manufactured by Bruker A.X.) was used to measure the linear expansion curve at a temperature increase rate of 5°C / min with a 10 g load applied to the glass rod, and the sagging point was determined.

[0113] (6) 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).

[0114] (7) Density: The density was measured by Archimedes' method using a glass block of about 20 g containing no bubbles cut out from a glass plate.

[0115] (8) 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."

[0116] (9) 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."

[0117] (10) 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."

[0118] (11) Fracture toughness: A sample of 65 mm × 6.5 mm × 6.5 mm was prepared and measured by the DCDC method. At that time, a 2.0 mm diameter through hole was drilled on the 65 mm × 6.5 mm surface of the sample to evaluate the fracture toughness.

[0119]

[0120] The glasses of Examples 1 to 7, which are working examples, have a lower yield point and are excellent in formability, and are equivalent to or greater in Young's modulus, rigidity modulus, Poisson's ratio and / or fracture toughness than the glasses of Examples 8 to 14, which are comparative examples, and are therefore found to exhibit excellent formability and strength. ２ O ３ is less than 1.5%, CaO is more than 20%, Fe ２ O ３ is less than 0.0030%, R' ２ The comparative example, Example 9, contained less than 14% O and more than 20% RO, and had an excellent fracture toughness value, but a high yield point. ２ O ３ is more than 1.0%, Fe ２ O ３ The average linear expansion coefficient at 50 to 350°C was low and the yield point was high. ２ O ３ is less than 1.5%, CaO is more than 20%, K ２ O is more than 10%, Fe ２ O ３ is less than 0.0030%, R' ２ The comparative example, Example 12, contained SiO ２ is over 68%, Al ２ O ３is less than 1.5%, CaO is less than 10%, SiO ２ +Al ２ O ３ +B ２ O ３ is more than 70%, R' ２ The O content was less than 14%, the yield point was high, and the average linear expansion coefficient at 50 to 350°C, density, Young's modulus and rigidity modulus were low. ２ is over 68%, Al ２ O ３ is less than 1.5%, B ２ O ３ is more than 5.0%, CaO is less than 10%, Fe ２ O ３ is less than 0.003%, SiO ２ +Al ２ O ３ +B ２ O ３ is more than 70%, R' ２ The O content was less than 14%, the RO content was less than 10%, the yield point was high, and the average linear expansion coefficient at 50 to 350°C, density, Young's modulus and rigidity modulus were low. ２ O ３ is over 5.0%, B ２ O ３ is more than 5.0%, CaO is less than 10%, Fe ２ O ３ is less than 0.0030%, SiO ２ +Al ２ O ３ +B ２ O ３ is more than 70%, R' ２ The O content was less than 14%, the yield point was high, and the average linear expansion coefficient and density from 50 to 350°C were small.

[0121] <Preparation of Laminated Glass> Laminated glasses of Test Examples 1 to 6 were prepared according to the following procedure. Test Examples 1 to 6 are examples.

[0122] (Test Example 1) As the first glass plate, glass having a thickness of 2.5 mm, a surface roughness Ra of 2.0 nm or less, and a composition shown in Example 6 in Table 1 was used. As the interlayer film, polyvinyl butyral (PVB) having a thickness of 0.78 mm was used. As the second glass plate, glass having a thickness of 1.5 mm and a composition shown in Example 12 in Table 1 was used. The first glass plate, the interlayer film, and the second glass plate were laminated in this order, and preliminary bonding was performed at 120°C for 15 minutes, followed by pressure bonding under conditions of 130°C and 1 MPa. Thereafter, the laminated glass of Test Example 1 was produced by returning to room temperature and atmospheric pressure over 90 minutes. The laminated glass of Test Example 1 had a total thickness of 4.8 mm for the first glass plate, the second glass plate, and the interlayer film, and a thickness of 1.5 mm for the first glass plate. １ and the thickness t of the second glass plate ２ The ratio (t １ / t ２ The yield points of the first glass sheet and the second glass sheet were T Ａ , T Ｂ The absolute value of the difference when Ａ -T Ｂ | was 28°C.

[0123] Test Examples 2 to 6 Laminated glass was produced in the same manner as in Test Example 1, except that the glass types and thicknesses of the first glass plate and the second glass plate were as shown in Table 2.

[0124]

[0125] 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. 2023-221647) filed on December 27, 2023, the entirety of which is incorporated by reference. All references cited herein are incorporated in their entirety.

[0126] 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. SiO in mole percentage based on oxide ２ : 60 to 68% Al ２ O ３ :1.5~5.0%B ２ O ３ :0.0~5.0% MgO:0.0~10% CaO:10~20% SrO:0.0~10% BaO:0.0~5.0% Li ２ O: 0.0-10% Na ２ O: 0.0~20% K ２ O: 0.0~10%Y ２ O ３ :0.0~1.0% Fe ２ O ３ Total iron oxide converted to SiO ２ +Al ２ O ３ +B ２ O ３ : 62 to 70% R' ２ O: 14-20% RO: 10-20% (RO is the total content of MgO, CaO, SrO and BaO, R' ２ O is Li ２ O, Na ２ O and K ２ Architectural, vehicular or sensor glass comprising:

2. The glass according to claim 1, having a density of 2.55 g / cm ３ or more.

3. The average linear expansion coefficient at 50 to 350 °C is 95 × 10 －７ / °C or more and 120 × 10 －７ / °C or less, and the glass according to claim 1 or 2.

4. K ２ O / R' ２ The glass according to any one of claims 1 to 3, wherein O is 0.50 or less.

5. The glass according to any one of claims 1 to 4, wherein MgO / RO is 0.10 or more and SrO / RO is 0.10 or more.

6. The glass according to any one of claims 1 to 5, which is bendable glass.

7. The glass according to any one of claims 1 to 5, which is physically strengthened glass.

8. The virtual temperature is (glass transition temperature T ｇ + 35) °C or higher and 570 °C or higher and 700 °C or lower, and the glass according to any one of claims 1 to 7.

9. A laminated glass having a first glass plate, a second glass plate, and an intermediate film sandwiched between the first glass plate and the second glass plate, wherein the first glass plate is the glass according to any one of claims 1 to 8.

10. When the yield points of the first glass plate and the second glass plate are T Ａ , T Ｂ respectively, the absolute value of the difference |T Ａ - T Ｂ | is 40°C or less. The laminated glass according to claim 9.

11. The laminated glass according to claim 9 or 10, wherein the relationship between the thickness t1 of the first glass plate and the thickness t2 of the second glass plate is t1 ≥ t2.

12. The laminated glass according to any one of claims 9 to 11, wherein the thickness t1 of the first glass plate is 2.5 mm or more and the thickness t2 of the second glass plate is 1.5 mm or less.

13. A vehicle window glass comprising the laminated glass according to any one of claims 9 to 12.

14. An architectural window glass comprising the laminated glass according to any one of claims 9 to 12.

15. A sensor glass comprising the laminated glass according to any one of claims 9 to 12.

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