Glass plate and window

Abstract

To provide a glass plate for a window material, a window comprising the glass plate, and a radio communication apparatus comprising the glass plate, which are less likely to impair radio transmitting / receiving in the use of a radio-utilizing apparatus.SOLUTION: The present invention provides a glass plate having a radio transmittance of at least 20% at a frequency of 100 GHz as calculated as 18 mm thickness, a window comprising the glass plate, and a radio communication apparatus comprising the glass plate.SELECTED DRAWING: Figure 2A

Description

[Technical field]

[0001] The present invention relates to a glass sheet used as a window material for vehicles, buildings, etc. [Background technology]

[0002] In vehicles such as automobiles and indoor buildings, radar, mobile phones, and other devices that use radio waves In particular, the use of devices that use radio waves (hereafter referred to as "radio wave devices") has become commonplace. Recently, high frequency bands (microwave to millimeter wave), more specifically, gigahertz frequency bands, e.g. Devices that use radio waves in the 3 to 300 GHz range are being actively developed. .

[0003] Glass for use as window materials in automobiles and buildings is described, for example, in US Pat. No. 5,399,323. Patent Document 1 states that the material has high visible light transmittance, high UV and solar radiation blocking performance, and is visually It is disclosed that good glasses can be obtained. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2002-348143 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of glass for windows, the suitability from the viewpoint of the use of radio wave-utilizing devices is particularly There have been no examples to date in which this has been taken into consideration.

[0006] The present invention relates to a method for detecting electric current generated by a radio wave utilizing device when the device is used in an environment where a window glass is present. To provide a glass plate for a window material and a window which are unlikely to impede wave transmission and reception. [Means for solving the problem]

[0007] The present invention provides a radio wave transmittance of 20% or less at a frequency of 100 GHz converted into an 18 mm thickness. The present invention provides a glass plate having the above-mentioned structure, a window having the glass plate, and a wireless communication device having the glass plate. do. Effect of the Invention

[0008] The glass plate and window of the present invention can automatically operate radio wave-utilizing devices that utilize radio waves in the high frequency band. This makes it possible to use the device without any problems even in a vehicle or inside a building. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic diagram showing an outline of conditions for determining radio wave transmittance. [Figure 2A] 1 is a graph showing the electric field strength ratios of the glass plates of Comparative Example 1 and Examples 1 to 6 at a thickness of 18 mm. [Figure 2B] 1 is a graph showing the electric field strength ratios of the glass plates of Comparative Example 1 and Examples 7 to 12 at a thickness of 18 mm. [Figure 2C] 1 is a graph showing the electric field strength ratios of the glass plates of Comparative Example 1 and Examples 13 to 17 at a thickness of 18 mm. [Figure 2D] 1 is a graph showing the electric field strength ratios of the glass plates of Comparative Example 1 and Examples 18 to 20 at a thickness of 18 mm. [Figure 3A] 1 is a graph showing approximate transmittances of Comparative Example 1 and Examples 1 to 6. [Figure 3B] 1 is a graph showing approximate transmittances of Comparative Example 1 and Examples 7 to 12. [Figure 3C] 1 is a graph showing approximate transmittances of Comparative Example 1 and Examples 13 to 17. [Figure 3D]1 is a graph showing approximate transmittances of Comparative Example 1 and Examples 18 to 20. [Figure 4] 1 is a graph showing measured values ​​of radio wave transmission amount for the laminated glass of Comparative Example 1 and calculated values ​​of radio wave transmission amount obtained by exponential approximation. [Diagram 5] 1 is a graph showing the measured values ​​of radio wave transmission for the laminated glasses of Comparative Example 1, Example 3, Example 4, Example 11, and Example 25 and the calculated values ​​of radio wave transmission obtained by exponential approximation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Unless otherwise indicated, the definitions of terms provided below apply throughout the specification, drawings, and claims. This applies throughout the scope of the The "~" symbol indicates a range of values, and the values ​​before and after it are the lower and upper limits, respectively. Glass being "substantially free" of a certain component means that it contains the component as an impurity. This means that the ingredient is not actively added, except in cases where it is unavoidable. The content of each component in the lath is expressed as a mole percentage on an oxide basis.

[0011] In this specification, the "radio wave transmittance" of a glass plate is determined as follows. As shown in FIG. 1, a 90 m wire is inserted into a perfect conductor frame 10 having an infinite area and a finite thickness. m square (8100mm 2 ) square aperture 20. A plane wave with a field strength of 1 V / m is emitted from a wave source 30 located 60 mm away in the direction of the aperture, with the wave front parallel to the aperture. The light is incident perpendicularly to the aperture so that the polarization direction is parallel to one side of the aperture. On the opposite side of the aperture from the wave source, 300 mm away from the center point of the aperture in the vertical direction The electric field intensity is observed at a point (observation point 40). The electric field intensity observed when a glass plate sample of the same area is fitted is compared with that of the glass plate sample. If the plate is not fitted (i.e., the glass plate sample is replaced by an air mass of the corresponding thickness), The electric field strength ratio of the glass plate is calculated by dividing the electric field strength observed at the This electric field strength ratio was measured using an electromagnetic field simulator (CST Micro The results are obtained by performing a simulation using Rowave Studio 2016. It is possible. The electric field strength ratio is the electric field strength observed through the glass plate sample to the air under the above conditions. is the ratio of the electric field strength observed through However, it is sometimes expressed as a percentage (%). The electric field strength ratio depends on the thickness of the glass plate, It can be determined depending on the relative dielectric constant, dielectric loss, and frequency of the incident wave. Methods for measuring the dielectric constant and dielectric loss of lath plate samples are known to those skilled in the art, e.g. It is measured by the cavity resonance method.

[0012] As used herein, unless otherwise specified, the following terms have the following meanings: The aperture is a square opening in a frame of a perfect conductor with infinite area. When observing the transmittance of radio waves or the electric field strength after transmission, the same shape and surface area as the aperture are used. A glass plate sample of 1000 nm is fitted into the aperture. The wavefront of the plane wave is parallel to the aperture plane, and the polarization of the plane wave is The wave direction is parallel to one side of the aperture, and the plane wave is incident perpendicular to the aperture. The distance from the aperture refers to the distance along a perpendicular line from the aperture plane. The description of the observation point that is separated by a distance is taken along a perpendicular line from the center point of the aperture. It represents a point away from the surface. The source and the observation point are located on opposite sides of the aperture. The thickness of the glass plate is mm, and the area of ​​the opening is mm 2 , the wavelength of radio waves is mm, the frequency is GHz, Field strength is expressed in V / m.

[0013] The glass plate of the present invention is resistant to radio waves at a frequency of 100 GHz, calculated for an 18 mm thickness. The transmittance is 20% or more. This prevents the transmission of electromagnetic waves from radar, mobile phones, and other radio wave-using devices. The glass plate is unlikely to be a barrier to radio wave reception. The transmittance is obtained by performing exponential approximation, which will be described later. This radio wave transmittance is preferably 21% or more. More preferably, it is 22% or more, more preferably, it is 25% or more, and more preferably Preferably, the ratio is 29% or more, more preferably 33% or more, and even more preferably 37% or more. More preferably, it is 40% or more, further preferably, it is 43% or more, and particularly preferably, it is 45% or more. More preferably, it is 48% or more, and most preferably, it is 50% or more. For the conversion of radio wave transmittance to thickness, see, for example, Introduction to Electromagnetic Wave Guidance (Masahiro Hashimoto, published by Nikkan Kogyo Shimbun) Analysis was performed using the propagation equation for plane electromagnetic waves shown in "Chapter 2: Transmission of Electromagnetic Waves" in the This can be done objectively. The glass plate according to the present invention has a radio wave transmission characteristic at a frequency of 80 GHz, calculated based on a thickness of 18 mm. It is preferable that the transmission rate is 23% or more. This will prevent the use of radio waves by radar, mobile phones, etc. The glass plate is less likely to be a barrier to transmission and reception by devices. 25%, more preferably 26% or more, more preferably 30% or more, More preferably, it is 35% or more, more preferably, it is 40% or more, and further preferably, it is 4 4% or more, particularly preferably 48% or more, even more preferably 52% or more, and most preferably 54% or more. % or more. The glass plate according to the present invention has a radio wave transmission of 28 GHz, calculated based on a thickness of 18 mm. It is preferable that the transmission rate is 39% or more. This allows for the use of radio waves by radar, mobile phones, etc. The glass plate is less likely to be a barrier to transmission and reception by devices. 40% or more, more preferably 44% or more, more preferably 50% or more , more preferably 56% or more, even more preferably 60% or more, and particularly preferably 62% or more. % or more, more preferably 65% ​​or more, and most preferably 68% or more.

[0014] The glass plate of the present invention is resistant to radio waves at a frequency of 100 GHz, calculated for an 18 mm thickness. It is preferable that the radio wave transmittance is 84% ​​or less. In order to make the radio wave transmittance exceed 84%, It may be necessary to increase the SiO2 content of the glass excessively. Such glasses are difficult to melt. The molding temperature is also high, and the float method, fusion method, roll-out method, down-dip method, It becomes difficult to manufacture large plates using the low method, etc. Also, if the radio wave transmittance is high, the B2O3 component will be present in large amounts. This means that the alkali elements tend to volatilize during melting and molding. This not only leads to a deterioration in glass quality, but also reduces the average linear expansion coefficient. Furthermore, the increase in B2O3 and SiO2 components leads to a decrease in Young's modulus. This can easily lead to a decrease in the rigidity of the board, which can make it difficult to ensure its strength during use. In addition, in order to increase radio wave transmittance, it is necessary to reduce the content of alkaline elements. As a result, this leads to a deterioration in solubility and a significant deterioration in viscosity, which is undesirable. This could lead to problems in the manufacture of glass, particularly for automobiles. Therefore, this radio wave transmittance is preferably 80% or less, more preferably 70% or less, more preferably 60% or less, and even more preferably Preferably, the ratio is 55% or less, more preferably 50% or less, particularly preferably 47% or less, and even more preferably It is preferably 45% or less, and most preferably 43% or less. The glass plate according to the present invention has a radio wave transmission characteristic at a frequency of 80 GHz, calculated based on a thickness of 18 mm. It is preferable that the radio wave transmittance is 84% ​​or less. In order to make the radio wave transmittance exceed 84%, It may be necessary to make the glass contain an excessive amount of SiO2. Such glasses are difficult to melt. The molding temperature is also high, and the float method, fusion method, roll-out method, down drop method, It would be difficult to manufacture large plates using the ion beam forming method, etc. This radio wave transmittance is preferably 80% or less. More preferably, the ratio is 70% or less, more preferably, 61% or less, and more preferably, 58%. or less, more preferably 55% or less, particularly preferably 52% or less, and even more preferably 49% or less The most preferable range is 47% or less. The glass plate according to the present invention has a radio wave transmission of 28 GHz, calculated based on a thickness of 18 mm. It is preferable that the radio wave transmittance is 84% ​​or less. In order to make the radio wave transmittance exceed 84%, It may be necessary to make the glass contain an excessive amount of SiO2. Such glasses are difficult to melt. The molding temperature is also high, and the float method, fusion method, roll-out method, down drop method, It would be difficult to manufacture large plates using the ion beam forming method, etc. This radio wave transmittance is preferably 82% or less. More preferably, the ratio is 80% or less, more preferably 78% or less, and more preferably 76%. less than 75%, more preferably less than 72%, and even more preferably less than 68%. The most preferable range is 64% or less.

[0015] In this specification, λ represents the wavelength of radio waves (unit: mm). A plane wave with a frequency of 10 GHz and an electric field strength of 1 V / m is emitted from a wave source 2 λ away from the aperture 20. When the light is incident on a 1.2λ glass plate, the electric field strength at an observation point 10λ away from the aperture is y( V / m), opening area S (mm 2 ) into λ 2 Let the value divided by x be x, and the linear approximation is y>(0.0 The observed electric field strength y, which varies depending on the aperture area, is preferably 607×x. Using the above conditions, an electromagnetic field simulator (CST Microwave Studi o 2016) can be determined by performing a simulation. Linear approximation is a linear approximation obtained using the least squares method, as is well known to those skilled in the art. The above statement "when incident on a glass plate with a thickness of 1.2λ" assumes that the glass plate is 1. This represents a conversion to 2λ, and the actual thickness of the glass plate of the present invention is 1.2λ. There is no need.

[0016] The above linear approximation of the glass plate is y>(0.0607×x), so the glass The slope of the graph of the linear function obtained by linearly approximating the relationship between x and y obtained from the board is y= This means that the slope of the graph is greater than (0.0607×x). This linear approximation is y≦( If the slope is 0.0607 or less, the frequency band is high. The linear approximation above is likely to prevent radio wave devices from functioning properly. The slope of the function is more preferably 0.0625 or more, and even more preferably 0.0644 or more. That's all. This inclination is not a problem if it is large, but if it is 0.0879 (instead of a glass plate) It is impossible for the temperature to exceed the value obtained by placing an air mass on the ground and observing it. The slope of the linear function obtained by the above linear approximation is preferably 0.0796 or less. If the glass has a viscosity of 0796 or less, the proportion of SiO2 and B2O3 in the glass can be reduced, and the glass can be manufactured more efficiently. This makes it easier to adjust the weather resistance and thermal expansion properties of the glass, This makes it easier to manufacture large glass sheets suitable for making windows for various applications. The slope of the linear function obtained is more preferably 0.0750 or less, and even more preferably 0.07 00 or less, more preferably 0.0690 or less, more preferably 0.0680 or less, and even more preferably Preferably, the ratio is 0.0670 or less, more preferably 0.0665 or less, and most preferably 0.0 It is 657 or less.

[0017] The glass plate according to the present invention has an approximate transmittance y' at a frequency of 100 GHz, The thickness is x', and the exponential approximation (referred to as "exponential approximation at 100 GHz" in this specification) is used. It is preferable that the exponential constant y'>exp(-0.081×x') is satisfied.

[0018] This exponential approximation at 100 GHz is determined as follows. First, the target glass plates are cut into thicknesses of 12 mm, 18 mm, 24 mm, 30 mm, and 36 mm. For each of the converted values ​​for 40 mm, the current corresponding to the frequency x'' (GHz) is The curve of variation of the field intensity ratio is determined, and an exponential approximation (referred to herein as the exponential approximation) of the relationship between x'' and the field intensity ratio is obtained. Then, this exponential approximation is calculated (also called "exponential approximation of the relationship between frequency and radio wave transmittance"), and Let the radio wave transmittance be y''. In other words, y'' = [constant 1] x e [定数2]×x’’ That The exponential approximation is obtained using the least squares method, as is well known to those skilled in the art. For example, for a glass plate (Comparative Example 1) with a thickness of 12 mm, y' '=0.7628e -0.003x’’ , and for the same glass plate with a thickness of 18 mm, y'' = 0.8619e -0.015x’’ The exponential approximation is obtained. This approximation is based on the results of an electromagnetic field simulator analysis at 6 to 20 GHz. Due to the characteristics of the electromagnetic field simulator, the frequency band is smaller than the center frequency of the analysis band. It is known that the accuracy of calculations deteriorates as the distance increases, and that the accuracy deteriorates significantly especially in the low frequency band. Therefore, it is preferable to apply it in the frequency band of 6 GHz or more. Although the upper limit of the analysis frequency is 20 GHz, the frequency dependence of the attenuation term is negligible. Since the approximation is so small, it is also possible to apply this approximation to frequencies above 20 GHz. Therefore, the glass plate of the present invention has a frequency of 6 to 20 GHz converted to a thickness of 18 mm. In the exponential approximation of the relationship between frequency and electric field strength ratio, y''>0.8619e -0.015 x’’ It is preferable that y''>0.85e -0.012x’’ , and more preferably y″>0.84e -0.010x’’ , and particularly preferably y''> 0.84e -0.09x’’ , more preferably y″>0.84e -0.008x’’ , and most preferably y″>0.84e -0.007x’’ It is. Also, preferably, y''<0.84e -0.0005x’’ This makes it possible to This allows the content of SiO2 and B2O3 in the glass to be reduced, and the glass can be manufactured more efficiently. This makes it easier to manufacture and allows the weather resistance and thermal expansion properties of the glass to be adjusted, This makes it easier to produce large glass sheets suitable for making windows for various applications. ''<0.84e -0.001x’’ , and more preferably y″<0.84e -0.003 x’ , and particularly preferably y″<0.84e -0.005x’ , more preferably y''<0 .8435e -0.006x’’ , and most preferably y''<0.8462e -0.007 x’’ It is.

[0019] Next, based on the exponential approximation of the relationship between frequency and electric field intensity ratio obtained for each thickness above, Then, the transmittance (approximate transmittance) at 100 GHz is calculated. For 100 GHz, the relationship of approximate transmittance y' according to thickness x' is obtained, and this relationship By further exponential approximation, the above-mentioned "index at 100 GHz" is obtained. Note that for the purpose of calculation to obtain the exponential approximation, the thickness x' is varied as above. However, it will be appreciated that the particular glass sheets of the present invention may have any thickness.

[0020] In general, the electric field strength ratio of a radio wave passing through a glass plate is calculated by multiplying the wavelength of the radio wave by the thickness of the glass plate. This varies greatly depending on whether the wavelength matches the wavelength of the light, and has a complex effect on the reflection, refraction, and interference of radio waves. Therefore, as the frequency is increased continuously, the field strength ratio changes periodically. It is observed that the ion exchange rate rises and falls in a random and irregular trajectory (see, for example, Figures 2A to 2D). Whether the electric field strength ratio measured at a certain frequency is larger or smaller, It may not necessarily essentially describe the radio wave transmission characteristics of the glass material. In other words, at that particular frequency, the second pane of glass transmits more radio waves than the first pane of glass. Even if it is transmitted, if we look at a wider frequency range macroscopically, the first glass as a whole It is possible that the radio wave transmission characteristics of the above-mentioned material may be superior (see Figs. 2A to 2D). The approximation described above is useful. etc.

[0021] For a certain glass plate, the exponential approximation at a frequency of 100 GHz is y'>exp(-0.081× x') means that the relationship between x' and y' obtained from the glass plate is exponentially approximated. The graph of the exponential function obtained by These graphs plot x' on the horizontal axis and y' on the vertical axis, When y'=0 (no glass thickness), y'=1 (transmittance 100%). If y'≦exp(-0.081×x'), the transmission of radio wave using equipment in the high frequency band This tends to interfere with reception. x' in the exponential approximation at this frequency of 100 GHz The coefficient is more preferably -0.075 or more, and even more preferably -0.07 or more. It is particularly preferably −0.065 or more, even more preferably −0.06 or more, and most preferably The coefficient of x' is preferably -0.055 or more. It is not a problem if it is large, but it is usually -0. The coefficient of x' is preferably less than or equal to -0.02. This makes it possible to reduce the content of SiO2 and B2O3 in the glass, This makes it easier to manufacture and also makes it possible to adjust the weather resistance and thermal expansion properties of the glass. This makes it easier to produce large glass sheets suitable for making windows for various applications. is -0.03 or less, more preferably -0.035 or less, particularly preferably -0.04 or less, More preferably, it is −0.045 or less, and most preferably, it is −0.05 or less.

[0022] The glass panes according to the invention preferably have an area of ​​900 mm 2 That's it. Surface of the glass plate The width is 900 mm 2 If the above is the case, the amount of radio wave transmission required for the use of radio wave-utilizing devices must be secured. It is possible to use the film in a wide range of applications, such as architectural applications and automotive applications. Approximately 2500mm 2 More preferably, it is 10,000 mm 2 More preferably, is 90000mm 2 More preferably, 180,000 mm 2 More preferably, 36 0000mm 2 More than 1,120,000 mm, most preferably 2 That's all. From the perspective of radio wave penetration From now on, there will be no upper limit on the area, but 100,000,000 mm 2 Larger glass plate would be difficult to manufacture. The area should preferably be 56250000 mm 2 and Preferably 25 million mm 2 Less than 9,000,000 mm, particularly preferably 2 below, More preferably, 4,000,000 mm 2 Below, most preferably 2,160,000 mm 2 Below The area of ​​the glass plate is 900 mm 2 If it is smaller, applications in architecture, automobiles, etc. will be limited. Furthermore, regardless of the transmittance, the absolute amount of radio waves passing through the glass sheet may be reduced.

[0023] The glass plate according to the present invention has an A×radio wave transmittance of 0.0225 m 2 %~8400m 2 · % is satisfied. Here, A is the area of ​​the glass plate (m 2 ) and the radio wave transmittance is , is the radio wave transmittance (%) at a frequency of 100 GHz, converted to a thickness of 18 mm. A x radio wave transmittance is 0.0225m 2 %, the electric field is larger than that of conventional glass plates. This is preferable because it provides strength. 2 If it is less than 1%, the high frequency band It is more difficult to use it as a window in such a place. A × radio wave transmittance is preferably 0.4m 2 · % or more, more preferably 4m 2 % or more, more preferably 8m 2 % or more, especially preferred Approximately 16m 2 % or more, more preferably 28m 2 % or more, most preferably 50m 2 % That's all. In addition, by increasing A × radio wave transmittance, the amount of radio wave transmission can be increased. A x radio wave transmittance is not a problem if it is large, but it is preferable to use a value of 8400m. 2 % or less If A becomes too large, it becomes difficult to manufacture the glass plate. A x radio wave transmittance is more preferable. Approximately 3000m 2 % or less, more preferably 800m 2 % or less, even more preferably 400m 2 % or less, particularly preferably 200m 2 % or less, more preferably 120m 2 · % or less, most preferably 80m 2% or less.

[0024] The glass plate according to the present invention has a radio wave transmittance / t of 0.7% / mm to 84% / mm. Here, t is the thickness (mm) of the glass plate, and the radio wave transmittance is This is the radio wave transmittance (%) at a frequency of 100 GHz, converted into a thickness. Radio wave transmittance / t is If it is 0.7% / mm or more, it is possible to obtain a higher approximate transmittance than that of conventional glass plates. If the radio wave transmittance / thickness t is less than 0.7% / mm, it is not suitable as a window in the high frequency band. The radio wave transmittance / t is preferably 1% / mm or more, and more preferably 2% / mm or more, more preferably 3% / mm or more, particularly preferably 4% / mm or more. The radio wave transmittance is preferably 5% / mm or more, and most preferably 5.5% / mm or more. By increasing the thickness or decreasing the thickness, the radio wave transmittance / t increases, and the approximate transmittance is increased. There is no problem with increasing the radio wave transmittance / t, but it is preferable to keep it at 84% / t. If t is too small, the deflection becomes too large, and the glass becomes In addition, glass with high radio wave transmittance has a high SiO2 content, so the glass This makes it difficult to manufacture the plate. Also, if the radio wave transmittance is high, a large amount of B2O3 must be added. This makes it easier for alkali elements to volatilize during melting and forming, resulting in poor glass quality. Not only may this lead to deterioration, but the average linear expansion coefficient will become smaller, making physical strengthening difficult. Furthermore, an increase in the B2O3 or SiO2 content tends to decrease the Young's modulus, which This may reduce the rigidity of the board and make it difficult to ensure sufficient strength during use. In order to increase the passivation rate, it is necessary to reduce the content of alkali elements, which results in poor solubility. This is undesirable because it leads to the glass becoming unstable and the viscosity of the glass deteriorates significantly. This may cause problems in manufacturing. Therefore, the radio wave transmittance / t is preferably 65% / mm or less. , more preferably 50% / mm or less, further preferably 40% / mm or less, and particularly preferably is 30% / mm or less, more preferably 25% / mm or less, and most preferably 20% / mm or less Below. Furthermore, in terms of use, glass sheets used for construction purposes tend to be thick. Therefore, the lower limit of the radio wave transmittance / t should be smaller, and more preferably 1.3% / mm or less. More preferably, the thickness is 1.6% / mm or more, particularly preferably, 1.8% / mm or more, and even more preferably, It is preferably 2.4% / mm or more, and most preferably 3% / mm or more. It is preferable that the thickness is less than 25% / mm, more preferably less than 15% / mm. Particularly preferably 11% / mm or less, even more preferably 9% / mm or less, and most preferably 8% / mm or less.

[0025] When used for automobiles, the glass plate thickness is, for example, 2mm to 6mm, The lower limit of the radio wave transmittance / t is more preferably 5% / mm or more, and even more preferably 6% / mm More preferably, the ratio is 7% / mm or more, more preferably 7.5% / mm or more, and most preferably 7.5% / mm or more. The upper limit is preferably 8% / mm or more. The upper limit is more preferably 25% / mm or less, and even more preferably Preferably, the thickness is 20% / mm or less, more preferably, the thickness is 16% / mm or less, and even more preferably, the thickness is 13% / mm or less. mm or less, and most preferably 12% / mm or less. On the other hand, when using a thin glass plate of 1 to 2 mm, the lower limit of the radio wave transmittance / t is Preferably, the thickness is 15% / mm or more, more preferably, 17% / mm or more, and particularly preferably, 20 % / mm or more, more preferably 25% / mm or more, and most preferably 30% / mm or more. The upper limit is more preferably 70% / mm or less, further preferably 60% / mm or less, particularly Preferably, the thickness is 55% / mm or less, more preferably, 50% / mm or less, and most preferably, 48% / mm or less. % / mm or less.

[0026] The glass plate according to the present invention preferably has a specific gravity of 2.40 to 3.00. The heating rate is preferably 60 GPa to 100 GPa. The average linear expansion coefficient at is 50×10 -7 / ℃~120×10 -7 / °C. If the glass sheet satisfies these physical property requirements, it can be used suitably as a window material for buildings, automobiles, etc. It is possible.

[0027] In order to ensure weather resistance, it is preferable that a certain amount of SiO2 or more is contained. The lower the O3 content, the better. As a result, the specific gravity is preferably 2.40 or more, and more preferably Preferably, it is 2.42 or more, more preferably, it is 2.44 or more, and even more preferably, it is 2.46 or more. More preferably, the ratio is 2.48 or more, even more preferably 2.50 or more, and most preferably 2.5 2 or more. With a specific gravity of 3.0 or less, it is less likely to become brittle and is lightweight. Therefore, it is preferable that the ratio is 2.90 or less, more preferably 2.80 or less, and even more preferably 2.90 or less. More preferably, it is 2.75 or less, particularly preferably 2.70 or less, and even more preferably 2.6 5 or less, and most preferably 2.62 or less.

[0028] The large Young's modulus gives the glass sheet rigidity, making it suitable for use in buildings and automobiles. The Young's modulus is more preferably 65 GPa or more, and further preferably 70 More preferably, the pressure is 72 GPa or more, and particularly preferably 74 GPa or more. The Young's modulus is preferably 75 GPa or more, and most preferably 76 GPa or more. In order to prevent this, increasing the amount of SiO2 reduces the solubility, so the Young's modulus is preferably 100 GPa or less. Preferably, the pressure is 95 GPa or less, more preferably 90 GPa or less, and even more preferably 95 GPa or less. Preferably, the pressure is 85 GPa or less, more preferably, 82 GPa or less, and even more preferably, 80 GPa or less. and most preferably 78 GPa or less.

[0029] The average linear expansion coefficient is determined from the viewpoint of thermal stress caused by the temperature distribution of the glass plate when it is used. Therefore, the average linear expansion coefficient from 50°C to 350°C is 120 ×10 -7 / ℃ or less is preferable, and 110×10 -7 / ℃ or less is more preferable, and 100×1 0 -7 / ℃ or less is more preferable, and 90×10 -7 / ℃ or less is more preferable, and 80×10 -7 / ℃ or less is particularly preferable, and 70×10 -7 / ℃ or less is more preferable, and 60×10 -7 / °C or less is most preferable. However, if the linear expansion coefficient is too small, it may cause problems such as metal sashes. The difference in thermal expansion between the material and the material may become large, causing distortion and leading to cracks. The average linear expansion coefficient from 0°C to 350°C is 35×10 -7 / ℃ or higher is preferable, and 40× 10 -7 / ℃ or more is more preferable, and 45×10 -7 / ℃ or more is more preferable, and 50×10 -7 / ℃ or more is more preferable, and 55×10-7 / °C or more is particularly preferred. In addition, for use in construction, automobiles, etc., it is preferable that physical reinforcement is possible. For this reason, it is more preferable that the average linear expansion coefficient is large. The average linear expansion coefficient is more preferably 60×10 -7 / ℃ or more, more preferably 65×1 0 -7 / °C or more, and particularly preferably 70×10 -7 / °C or more, more preferably 75×10 - 7 / ℃ or higher, most preferably 80×10 -7 / ℃ or higher.

[0030] The glass plate according to the present invention has a leaching amount of Na2O of 0.001 mg to 0.6 mg in a water resistance test. The water resistance test is preferably performed in accordance with JIS 3502 (1995). The amount of a2O dissolved (mg). Glass plates with a leaching amount of Na2O of 0.6 mg or less in the water resistance test are suitable for everyday use as windows. It can be used without any problems. The amount of Na2O dissolved in the water resistance test is preferably 0.55m g or less, more preferably 0.5 mg or less, particularly preferably 0.4 mg or less, even more preferably The Na2O content in the water resistance test is preferably 0.35 mg or less, and most preferably 0.3 mg or less. The less SiO2 dissolved, the better. To reduce this amount, the amount of SiO2 must be increased. If this is the case, the viscosity of the glass may increase during melting in the glass manufacturing process, resulting in poor solubility. Therefore, the amount of Na2O eluted in the water resistance test is preferably 0.001 mg or more, and more preferably Preferably, the amount is 0.01 mg or more, more preferably 0.05 mg or more, and particularly preferably 0.1 mg or more, more preferably 0.15 mg or more, and most preferably 0.2 mg or more.

[0031] In the glass sheet according to the present invention, T2 is preferably 1750° C. or less. It is preferable that the temperature is 1350°C or less. L is -150℃ or higher. In this specification, T2 is a glass viscosity of 10 2 (dPa s) is the temperature T4 represents a glass viscosity of 10 4 (dPa s), and T L is glass liquid represents the phase temperature. When T2 or T4 exceeds these specified temperatures, the float method, fusion method, and It becomes difficult to manufacture large plates using the roll-out method, down-draw method, etc. , more preferably 1700°C or less, even more preferably 1650°C or less, and even more preferably Preferably, the temperature is 1625°C or lower, more preferably, 1600°C or lower, and even more preferably, 1575°C or lower. More preferably, it is 1550°C or less, and most preferably, it is 1500°C or less. Preferably, the temperature is 1350°C or lower, more preferably, 1300°C or lower, and even more preferably, 1250°C or lower. Particularly preferably, the temperature is 1200° C. or lower, more preferably, 1150° C. or lower, and even more preferably, The lower limits of T2 and T4 are preferably 1100°C or less, and most preferably 1050°C or less. Although not limited to this, in order to maintain weather resistance and glass density, T2 is typically 1200 T2 is more preferably 1250°C or higher, and T4 is more preferably 800°C or higher. or 1300°C or higher, particularly preferably 1350°C or higher, and even more preferably 1400°C or higher. T4 is more preferably 900° C. or higher, further preferably 940° C. or higher, particularly preferably Preferably, the temperature is 960°C or higher, more preferably 980°C or higher, and most preferably 1000°C or higher. . Furthermore, in order to enable manufacturing using the float method, T4-T L is above -150℃ T4-T L If it is less than -150℃, devitrification occurs in the glass during glass molding. This prevents problems such as a decrease in the mechanical properties of the glass or a decrease in transparency. This is preferred because it produces high-quality glass. L is preferably -140℃ or less, more preferably -130°C or less, more preferably -120°C or less, more preferably -110℃ or less, more preferably -100℃ or less. L is more preferred Preferably, the temperature is -90°C or higher, more preferably -80°C or higher, more preferably -70°C or higher, and even more preferably -80°C or higher. Preferably, the temperature is -60°C or higher, more preferably -50°C or higher, and even more preferably -40°C or higher. More preferably, the temperature is -30°C or higher, more preferably -20°C or higher, and even more preferably -40°C or higher. More preferably, the temperature is -10°C or higher, particularly preferably 0°C or higher, even more preferably 10°C or higher, and most preferably 10°C or higher. Preferably, the temperature is 20° C. or higher.

[0032] The glass plate according to the present invention is g The temperature is preferably 400°C to 750°C. In T g represents the glass transition temperature. g Within this temperature range, normal manufacturing conditions Glass bending can be performed within the range of T g If the temperature is lower than 400℃, the moldability is poor. However, if the alkali content or alkaline earth content becomes too high, In this case, problems such as excessive thermal expansion of the glass and reduced weather resistance are likely to occur. In the forming temperature range, the glass may become devitrified and become unable to be formed. g is more preferred Preferably, the temperature is 430° C. or higher, more preferably 450° C. or higher, and particularly preferably 470° C. or higher. The temperature is preferably 480° C. or higher, and most preferably 490° C. or higher. g If is too high, Higher temperatures are required during glass bending, making manufacturing more difficult. g is more preferred Preferably, the temperature is 650°C or lower, more preferably, 600°C or lower, more preferably, 575°C or lower, and even more preferably, Preferably, the temperature is 565° C. or lower, more preferably 555° C. or lower, and particularly preferably 550° C. or lower. More preferably, it is 520°C or lower, and most preferably, it is 500°C or lower.

[0033] Visible light transmittance Tv_A is measured using a spectrophotometer in accordance with JIS R 3106:1998. The visible light transmittance is calculated by measuring the transmittance. The weighting coefficient is based on the standard A light source and a 2-degree visual field. In this specification, the values ​​are expressed as converted values ​​for a plate thickness of 3.85 mm. Here, the value converted to a plate thickness of 3.85 mm is the refractive index of the glass plate whose transmittance was measured. The reflectance of the glass plate is calculated from the refractive index using the Sellmeyer formula, and the multiple Taking reflection into account, the value of the glass plate (here, visible light transmittance Tv_A) is set to 3.85 mm thick. The value is converted to The visible light transmittance Tv_A depends on the application, but is preferably 30 to ensure visibility. % or more, more preferably 40% or more, even more preferably 50% or more, and particularly preferably 60% or more. % or more, more preferably 65% ​​or more, and most preferably 72% or more. The upper limit of the transmittance Tv_A varies depending on the application, but if it is too high, too much heat radiation will penetrate and In order to increase the visible light transmittance Tv_A, the impurities The problem is that it is difficult to obtain raw materials because they have to be made from materials with low purity. The glass must have a high content, which makes it difficult to melt and produce large glass sheets. Therefore, Tv_A is preferably 92% or less. Tv_A is more preferably 91.5% or less, more preferably 91% or less, particularly preferably 90.5% or less, even more preferably It is preferably 90% or less, and most preferably 89% or less. The visible light transmittance Tv_A is adjusted mainly by adjusting the amount of coloring components such as Fe2O3 and TiO2. However, some adjustments can be made depending on the glass components. This can also be achieved by adjusting the glass manufacturing conditions, such as adjusting the temperature. When the glass plate according to the present invention is used as a vehicle glass, the visible light transmittance Tv_A is: In order to improve visibility, it is preferably more than 70%, more preferably 71% or more, and particularly Preferably, it is 72% or more.

[0034] The solar transmittance Te is as specified in ISO-13837A:2008. In the document, the value is expressed in terms of a plate thickness of 3.85 mm. The solar transmittance Te depends on the application, but if it is too small, the visible light transmittance is likely to decrease and the visibility is reduced. In addition, it is difficult to obtain low Te even if the melting temperature is adjusted. The solar transmittance Te is preferably 35% or more, more preferably 40% or more. % or more, preferably 45% or more, more preferably 50% or more, and even more preferably 55% or more. More preferably, the content is 60% or more, even more preferably 65% ​​or more, and most preferably 70% or more. In addition, the upper limit of the solar transmittance Te varies depending on the application, but if it is too high, there will be a lot of heat rays. In addition, in order to increase the solar radiation transmittance Te, In order to achieve this, raw materials with fewer impurities must be used, making it difficult to obtain them. However, it is necessary to use glass with a high SiO2 content, which deteriorates the solubility and makes it difficult to manufacture large glass plates. Therefore, the solar transmittance Te is preferably 91% or less, and more preferably Preferably, the ratio is 90% or less, more preferably 88% or less, and particularly preferably 85% or less. It is preferably 80% or less, and most preferably 75% or less. The solar transmittance Te is adjusted by coloring components such as Fe2O3 and TiO2 and glass components. In addition, this can be achieved by adjusting the glass manufacturing conditions, such as the melting temperature and the melting atmosphere. can. When used as vehicle glass with heat shielding properties, the solar transmittance Te increases the heat shielding properties. Therefore, it is preferably 65% ​​or less, more preferably 60% or less, and even more preferably 58% or less. More preferably, Te is 55% or less, and particularly preferably 53% or less. If it is too small, the visible light transmittance decreases and it becomes difficult to ensure visibility, so it is preferably 35%. More preferably, 38% or more, even more preferably 40% or more, and particularly preferably 41% or more That's all. The ultraviolet transmittance Tuv is as specified in ISO-9050:2003. In this document, it is expressed as a value converted to a plate thickness of 3.85 mm. If the ultraviolet transmittance Tuv is too high, ultraviolet The glass plate of the present invention also transmits a large amount of radiation, which can have adverse effects on the human body. This can cause deterioration of the interior materials of buildings and vehicles. TUV is preferably 90% Less than or equal to 80%, more preferably less than or equal to 70%, and particularly preferably less than or equal to 50%. The most preferable value is 30% or less. To lower Tuv, the glass plate is coated with Fe2O3 , TiO2, CeO2, etc., and if the content of these is high, the visible light transmittance Tv Tuv has decided to It is preferably 1% or more, more preferably 5% or more, and particularly preferably 10% or more. The ray transmittance Tuv is preferably 40 to prevent deterioration of interior materials and reduce the cooling load inside the vehicle. % or less, more preferably 35% or less, and further preferably 30% or less.

[0035] The glass plate of the present invention can also be used for infrared sensor applications such as laser radar. When used as glass for vehicles equipped with infrared emitting devices such as laser radar, For optimal use in laser radar, the wavelength is 905 nm converted to a plate thickness of 3.85 mm. The transmittance is preferably 70% or more, more preferably 75% or more, and even more preferably 80%. More preferably, it is 85% or more, more preferably, it is 88% or more, and most preferably, it is 90% or more. Above. The glass plate of the present invention can also be used for infrared sensor applications such as laser radar. When used as glass for vehicles equipped with infrared emitting devices such as laser radar, For optimal use in laser radar, the wavelength is 1550 nm when converted to a plate thickness of 3.85 mm. The transmittance of the film is preferably 70% or more, more preferably 75% or more, and further preferably 80% or more. % or more, particularly preferably 85% or more, particularly preferably 88% or more, and most preferably 90% That's all.

[0036] The glass plate of the present invention has a low dielectric loss and high radio wave transmittance due to the adjustment of the glass composition. Similarly, the dielectric constant can be adjusted by adjusting the composition to suit the application. A dielectric constant matching the dielectric constant can be achieved.

[0037] The glass plate according to the present invention has a SiO2 content of 55% in terms of mole percentage based on oxides. It is preferable that the content of Al2O3 is 0% to 15%. SiO2 and Al2O3 contribute to improving the Young's modulus, which is why they are used in architectural applications. It is easy to secure the strength required for automobiles and other applications. Al2O3 and / or S If iO2 is less than the above lower limit, it becomes difficult to ensure weather resistance, and the average linear expansion coefficient If the amount of Al2O3 and / or Si is too large, it becomes susceptible to thermal cracking, which is undesirable. If the amount of O2 is too large, the viscosity of the glass increases during melting, making glass production difficult, and therefore this is not preferable. Also, if there is too much Al2O3, there is a risk that the radio wave transmittance will decrease.

[0038] The SiO2 content is preferably 57% or more, more preferably 60% or more, and more preferably 63% or more. More preferably, the ratio is 64% or more, particularly preferably 65% ​​or more, and more preferably 6 The SiO2 content is preferably 6% or more, more preferably 74% or less, and more preferably 73% or less. is more preferable, 72% or less is particularly preferable, 70% or less is even more preferable, and 69% or less is is most preferred. The content of Al2O3 is more preferably 0.3% or more, and further preferably 0.5% or more. More preferably, the content is 1.0% or more, particularly preferably 1.3% or more, and particularly preferably 1.5% or more. The Al2O3 content is preferably 0.1% or more, and most preferably 2% or more. The Al2O3 content keeps the glass viscosity T2 low. In order to facilitate the production of glass, 10% or less is more preferable, and 6% or less is even more preferable. Preferably, the content is 5% or less, more preferably 4% or less, and most preferably 3.5% or less. It is.

[0039] In order to improve radio wave transmittance, SiO2+Al2O3, i.e., the SiO2 content and Al The total 2O3 content is preferably 50% to 80%. T2 and T4 are kept low to manufacture glass. In order to make it easier to use, the SiO2+Al2O3 content is preferably 80% or less. More preferably, it is 75% or less, further preferably, it is 72% or less, further preferably, it is 71% or less, and most preferably, it is 75% or less. However, if the amount of SiO2+Al2O3 is too small, the weather resistance is reduced. The average linear expansion coefficient may become too large, so SiO2+Al2O3 is 55% or more is preferable, 64% or more is preferable, 65% or more is more preferable, and Preferably, the content is 66% or more, more preferably 67% or more, and most preferably 68% or more.

[0040] The glass plate according to the present invention preferably has a B2O3 content of 0% to 15%. The inclusion of 2O3 improves the melting property and glass strength, and also increases the radio wave transmittance. If there is too much B2O3, the alkali elements tend to volatilize during melting and molding. If the content of B2O3 is too high, the average linear expansion coefficient becomes small. The content of B2O3 is preferably 12% or less, and 1 More preferably 0% or less, even more preferably 8% or less, and particularly preferably 6% or less; More preferably, it is 4% or less, and most preferably, it is 2% or less. Furthermore, it is substantially free of B2O3. It is highly preferred.

[0041] The glass plate according to the present invention preferably has an MgO content of 0% to 20%. O is a component that promotes the melting of glass raw materials and improves weather resistance. The content of MgO is More preferably, the content is 0.1% or more, even more preferably, 0.2% or more, and particularly preferably, 0.3% or more. If the MgO content is 20% or less, devitrification is unlikely to occur. It may also be effective in increasing radio wave transmittance. The MgO content is 1 More preferably, the ratio is 5% or less, even more preferably, 8% or less, particularly preferably, 4% or less, and even more preferably, 2% or less. Lower is more preferable, and 1% or less is most preferable.

[0042] In the glass plate according to the present invention, CaO, SrO, and / or BaO are A certain amount of CaO may be included to reduce the amount of dielectric loss. The CaO content is 0% or more and 20% or less. The content of SrO is preferably 0% or more and 15% or less. The content of BaO is preferably 0% to 15%. The inclusion of BaO can also improve the melting property of glass. The CaO content is preferably 3% or more. This is preferable because it reduces the dielectric loss of the glass and improves the radio wave transmittance. By adding 3% or more CaO, the melting property of the glass is improved (T2 is decreased and T4 is increased). The CaO content is more preferably 6% or more, and particularly preferably CaO is 8% or more, more preferably 10% or more, and most preferably 11% or more. 0% or less, SrO or 15% or less, and BaO or 15% or less. This avoids an increase in the brittleness and strength of the glass, and prevents the glass from becoming brittle. The CaO content is preferably 15% or less, more preferably 14% or less, and more preferably 13.5% or less. % or less is particularly preferred, 13% or less is even more preferred, and 12.5% ​​or less is most preferred. The content of rO is more preferably 8% or less, further preferably 3% or less, and particularly preferably 2% or less. It is preferable that the content of SrO is 1% or less, more preferable that the content of SrO is 1% or less, and it is most preferable that the content of SrO is substantially zero. The content of BaO is more preferably 5% or less, further preferably 3% or less, and particularly preferably 2% or less. It is preferable that the content is 1% or less, more preferable that the content is 1% or less, and most preferable that the content is substantially zero.

[0043] In this specification, "RO" refers to the total content of MgO, CaO, SrO, and BaO. The glass plate according to the present invention preferably has an RO content of 0% to 20%. If the ratio is 20% or less, the weather resistance can be improved. More preferably, it is 17% or less, further preferably, it is 16% or less, and particularly preferably, it is 15% or less. Preferably, the thickness is 14% or less, and most preferably, the thickness is 13% or less. In addition, from the viewpoint of lowering T2 and T4 during manufacturing, or from the viewpoint of increasing Young's modulus Therefore, the glass plate of the present invention preferably has an RO of more than 0%, more preferably 0.5%. or more, more preferably 5% or more, particularly preferably 8% or more, and even more preferably 10% or more , and most preferably 12% or more.

[0044] In addition, it prevents devitrification during glass melting and molding, which leads to deterioration of glass quality. Therefore, the sum of MgO+CaO, i.e., the content of MgO and the content of CaO, is 0%~30%. % is preferable. MgO+CaO is more preferably 25% or less, and further preferably 20% More preferably, it is 15% or less, and most preferably, it is 13% or less. However, MgO+C If aO becomes too low, the glass viscosity during melting and molding becomes too high, making manufacturing difficult. Therefore, the content of MgO+CaO is preferably 1% or more, and more preferably 1% or more. is 2% or more, particularly preferably 3% or more, even more preferably 4% or more, and most preferably 5% or more. Above.

[0045] The glass plate according to the present invention preferably has a Na2O content of 0% to 20%. A2O and K2O are components that improve the melting property of glass. By adding 0.1% or more of each, T2 can be reduced to 1750℃ or less and T4 to 1350℃ or less. In addition, the inclusion of Na2O makes it easier to chemically strengthen the steel. The content of Na2O is more preferably 0.1% or more, and further preferably 1% or more. More preferably, the content is 3% or more, more preferably 5% or more, and most preferably 6% or more. do. By including both Na2O and K2O, weather resistance is improved while maintaining solubility. This is preferable because it can be used in a wide range of applications, and it may also be effective in increasing radio wave transmittance. A low content of Na2O and / or K2O increases the average linear expansion coefficient. By setting the above amount, it is possible to prevent the heat strengthening from being performed. It also has good consistency and can be used as a window material. If there is too much Na2O, the average linear expansion coefficient becomes too large and the material becomes susceptible to thermal cracking. The content of 2O is more preferably 16% or less, further preferably 14% or less, and particularly preferably is not more than 12%, more preferably not more than 10%, and most preferably not more than 8%.

[0046] The glass plate according to the present invention preferably has a K2O content of 0% to 20%. K2O is an ingredient that improves the melting property of glass, and it is effective in reducing T2 to 1750℃ or less and T4 to 135℃ or less. The content of K2O is preferably 0.1% or more, since it is easier to keep the temperature below 0°C. Preferably, the content is 0.9% or more, more preferably 2% or more, even more preferably 3% or more, and most preferably Preferably, it is 4% or more. Furthermore, if the amount of K2O is too large, the average linear expansion coefficient becomes too large, making the glass more susceptible to thermal cracking. If the content of K2O exceeds 20%, the weather resistance decreases, which is not preferable. More preferably 16% or less, even more preferably 14% or less, particularly preferably 12% or less, More preferably, it is 10% or less, and most preferably, it is 8% or less. From the viewpoint of radio wave transmittance, a high radio wave transmittance can be obtained by setting the thickness within the above range.

[0047] The glass plate according to the present invention preferably has a Li2O content of 0% to 20%. I2O is a component that improves the melting property of glass and also makes it easier to increase the Young's modulus. It also contributes to improving the strength of the glass. By including Li2O, chemical strengthening becomes possible. In addition, it may be effective in increasing the radio wave transmittance. Preferably, the content is 0.1% or more, more preferably 1% or more, and particularly preferably 2% or more. More preferably, it is 3% or more, and most preferably, it is 4% or more. If the amount of Li2O is too large, devitrification or phase separation may occur during glass production, making production difficult. The content of Li2O is more preferably 16% or less, and further preferably 1 2% or less, particularly preferably 8% or less, even more preferably 7% or less, and most preferably 6.5% The following is the result.

[0048] In this specification, "R2O" represents the total amount of alkali metal oxides, usually Li2O, The glass plate according to the present invention has an R2O content of 0 If the R2O content is 20% or less, the weather resistance is improved. The R2O content of the glass plate according to the present invention is more preferably 19% or less, and even more preferably is 18.5% or less, particularly preferably 18% or less, even more preferably 17.5% or less, and most preferably Preferably, it is 17% or less. In addition, from the viewpoint of lowering T2 and T4 during production, R2O is preferably more than 0%. More preferably, the content is 1% or more, even more preferably, 5% or more, and even more preferably, 6% or more. More preferably, the ratio is 8% or more, particularly preferably 10% or more, and even more preferably 1 It is preferably 1% or more, and most preferably 12% or more.

[0049] The Na2O / R2O ratio is preferably 0.01 to 0.98 in order to increase the radio wave transmittance. If the Na2O / R2O ratio is too small or too large, the effect of increasing the radio wave transmittance is insufficient. The Na2O / R2O ratio is preferably 0.01 or more, and more preferably Preferably, the ratio is 0.05 or more, more preferably 0.1 or more, particularly preferably 0.2 or more, and even more preferably The ratio is preferably 0.25 or more, and most preferably 0.3 or more. When Li2O is not contained, The lower limit of Na2O / R2O should be slightly larger than that when Li2O is contained. The Na2O / R2O ratio is preferably 0.01 or more, more preferably 0.1 or more, and even more preferably It is preferably 0.2 or more, particularly preferably 0.3 or more, even more preferably 0.35 or more, and most preferably It is preferably 0.4 or more. Na2O / R2O is preferably 0.98 or less, more preferably 0.8 or less, and even more preferably Preferably, it is 0.6 or less, more preferably, it is 0.5 or less, even more preferably, it is 0.45 or less, and most preferably Preferably, it is 0.4 or less. When Li2O is not contained, the upper limit of Na2O / R2O is In contrast, it is better for the ratio to be slightly larger than when Li2O is contained, and Na2O / R2O is preferred. It is preferably 0.98 or less, more preferably 0.9 or less, even more preferably 0.8 or less, and particularly preferably Preferably, it is 0.7 or less, more preferably 0.65 or less, and most preferably 0.6 or less.

[0050] In order to increase the radio wave transmittance, it is preferable that K2O / R2O is 0.01 to 0.98. If K2O / R2O is too small or too large, the effect of increasing radio wave transmittance is not sufficiently obtained. The K2O / R2O ratio is preferably 0.01 or more, and more preferably 0. 05 or more, more preferably 0.1 or more, particularly preferably 0.2 or more, and even more preferably 0.25 or more, most preferably 0.3 or more. When Li2O is not contained, K2 The lower limit of O / R2O should be slightly larger than when Li2O is contained, and K2O / R2O is preferably 0.01 or more, more preferably 0.1 or more, and even more preferably 0 0.2 or more, particularly preferably 0.3 or more, even more preferably 0.35 or more, and most preferably 0 .4 or greater. K2O / R2O is preferably 0.98 or less, more preferably 0.8 or less, and even more preferably or 0.6 or less, particularly preferably 0.5 or less, even more preferably 0.45 or less, and most preferably If Li2O is not contained, the upper limit of K2O / R2O is It is better to have a slightly larger K2O / R2O ratio than when I2O is included. 0.98 or less, more preferably 0.9 or less, even more preferably 0.8 or less, and particularly preferably is less than or equal to 0.7, more preferably less than or equal to 0.65, and most preferably less than or equal to 0.6.

[0051] It is preferable to keep R2O×MgO low in order to increase radio wave transmittance. GO preferably 100% 2 Less than or equal to 80% 2 Less than 66%, more preferably 2 Less than or equal to 60% 2 Less than 50%, especially preferred 2 The following is more preferred: About 40% 2 Below 30%, most preferably 2 The following is the case when Li2O is not included. The upper limit of R2O×MgO is preferably larger than that when Li2O is contained. O×MgO is preferably 250% 2 Less than or equal to 200%, preferably 2 The following is more preferable: Approximately 150% 2 The following is particularly preferably 100% 2 Less than 85%, more preferably 2 Below, the most More preferably 80% 2 The following is the result.

[0052] Furthermore, boron and alkali elements volatilize during melting and molding, leading to a deterioration in glass quality. In order to prevent this, R2O+B2O3, i.e., the sum of the R2O content and the B2O3 content, The total amount of R2O+B2O3 is preferably 30% or less. The amount of R2O+B2O3 is more preferably 25% or less, and even more preferably 25% or less. or 20% or less, more preferably 19% or less, and most preferably 18% or less. If the R2O+B2O3 ratio is too low, the glass viscosity during melting and molding will be too high. It may be difficult to manufacture. Therefore, it is preferable that R2O+B2O3 is 1% or more. Preferably, it is 2% or more, more preferably, it is 3% or more, even more preferably, it is 4% or more, and most preferably Most of the time it is 5% or more.

[0053] In the glass plate according to the present invention, 7Al2O3+3MgO is 0% to 66%. It is preferable that Al2O3, MgO, and 7Al2O3+3MgO are within the above content range. By satisfying this range, it is possible to improve the radio wave transmittance of the glass material. It is preferable that 7Al2O3+3MgO is small. If the amount is more than the specified amount, it becomes difficult to maintain the average linear expansion coefficient, and it becomes difficult to match with other materials. There is a risk of damage to the material or of physical strengthening becoming difficult. 7Al2O3+3Mg O is more preferably 60% or less, even more preferably 55% or less, and even more preferably 4 8% or less, particularly preferably 42% or less, even more preferably 30% or less, and most preferably 24 % or less. However, from the viewpoint of weather resistance, the more 7Al2O3+3MgO the better, and 0. More preferably, the ratio is 5% or more, even more preferably, 5% or more, and particularly preferably, 10% or more. % or more is more preferable, and 20% or more is the most preferable. This provides sufficient weather resistance. .

[0054] In the glass plate according to the present invention, 7Al2O3+3MgO-4Li2O is -60% to 66% is preferred. Al2O3, MgO, Li2O and 7Al2O3+3MgO-4L By satisfying the above content range of i2O, it is possible to improve the radio wave transmittance of the glass material. From the viewpoint of increasing radio wave transmittance and Young's modulus, 7Al2O3+3MgO-4L The smaller the i2O, the better. Furthermore, 7Al2O3+3MgO-4Li2O is a given amount If it is too high, it becomes difficult to maintain the average linear expansion coefficient, which hinders matching with other materials. There is a risk that the material may become brittle or that physical strengthening may become difficult. i2O is more preferably 50% or less, further preferably 40% or less, and particularly preferably 3 It is preferably 0% or less, more preferably 20% or less, and most preferably 10% or less. However, from the viewpoint of weather resistance, 7Al2O3+3MgO-4Li2O is more is preferable, -50% or more is more preferable, -40% or more is even more preferable, and -30% or more is This is particularly preferable, -20% or more is even more preferable, and -10% or more is most preferable. Sufficient weather resistance is obtained.

[0055] The glass plate according to the present invention preferably has a ZrO2 content of 0% to 5%. O2 has the effect of lowering the viscosity of glass during melting and accelerating melting. It also improves heat resistance and chemical properties. A high ZrO2 content can contribute to improving the chemical durability. The ZrO2 content is preferably 2.5% or less. It is more preferably 2% or less, particularly preferably 1.0% or less, and even more preferably It is preferably 0.5% or less, and most preferably contains substantially no ZrO2.

[0056] The glass plate according to the present invention has a composition containing 85% or less SiO2+Al2O3+MgO+CaO+SrO+ It is preferable that BaO+Li2O+Na2O+K2O+Fe2O3+TiO2≦100%. This will make it possible to manufacture glass sheets using readily available glass raw materials. In addition, the above total amount is more preferably 88% or more. , more preferably 90% or more, particularly preferably 92% or more, and even more preferably 95% or more More preferably, the porosity is 98% or more, and most preferably, 99.5% or more. Since colorants, clarifying agents, etc. are typically added to glass plates, the upper limit of the above total amount is 99.9%. is more preferred.

[0057] The glass plate according to the present invention preferably has an Fe2O3 content of 0.001% to 5%. Here, the content of Fe2O3 is the total amount of FeO, which is an oxide of divalent iron, and Fe3O, which is an oxide of trivalent iron. The total amount of iron, including the oxide Fe2O3, is set to less than 0.001%. If the glass is used in a manner that requires heat insulation, it may become impossible to use the glass for purposes that require heat insulation. For the production of plates, it became necessary to use expensive raw materials with low iron content, and moreover, glass When melting, there is a risk that more heat radiation than necessary will reach the bottom of the melting furnace, causing a load on the furnace. The content of Fe2O3 is more preferably 0.005% or more, More preferably, it is 0.01% or more, particularly preferably 0.015% or more, and even more preferably 0. It is preferably at least 0.02%, and most preferably at least 0.05%. If Fe2O3 exceeds 5%, heat transfer by radiation is hindered, making it difficult for the raw material to melt. In addition, if the Fe2O3 content becomes too high, the light transmittance in the visible range decreases. (Decrease in Tv) may occur, making it unsuitable for use in automotive applications. The content of O3 is more preferably 2% or less, even more preferably 1% or less, and even more preferably 0.8% or less, even more preferably 0.6% or less, particularly preferably 0.5% or less, It is preferably 0.4% or less, and most preferably 0.3% or less.

[0058] The glass plate according to the present invention is F The content of divalent iron (FeO) converted to e2O3 is 0.0001% to 0.02%. It is preferable to increase the heat ray absorption efficiency of the glass melt when melting the glass raw materials and improve the meltability. In order to prevent this, the content is preferably 0.0002% or more, and more preferably 0.0006% or more. The content is preferably 0.0008% or more, more preferably 0.001% or more. In addition, in order to absorb light from the visible range to the near infrared range, 0 It is preferably 0.015% or less, more preferably 0.01% or less, and even more preferably The content is preferably 0.008% or less, particularly preferably 0.006% or less, and particularly preferably Most of the time, it is less than 0.004%. When heat insulating performance is required, the glass sheet according to the present invention may be made of divalent iron, calculated as Fe2O3. The content of (FeO) is preferably 0.05% to 0.16%. In order to absorb light from the infrared region to improve heat insulation performance, the FeO content is set to 0.07% or more. It is preferable that the content of the stoichiometric ratio is 0.08% or more, more preferably 0.09% or more, and even more preferably 0.08% or more. In particular, the FeO content is preferably 0.1% or more. Since it absorbs heat and makes manufacturing difficult, the FeO content is preferably 0.015% or less. It is preferable that the content of the Cr content is 0.01% or less, more preferably 0.008% or less. The content is particularly preferably 0.006% or less, and particularly preferably 0.004% or less.

[0059] When an infrared irradiating device such as a laser radar is used, the glass plate according to the present invention has the following characteristics: The mass ratio of divalent iron converted to Fe2O3 in the total iron converted to Fe2O3 (hereinafter, Fe- It is preferable that FeO (also called redox) is more than 0% and 35% or less. The mass ratio of divalent iron converted to 3 is the mass ratio of divalent iron oxide FeO in the Fe2O3 form. The content of FeO is calculated by converting it into iron and the ratio of the converted content to the total iron content. The molecular weight of Fe2O3 is 159.7g / mol, while that of ZnO is 71.85g / mol. Therefore, by multiplying the FeO content by {(159.7÷2) / 71.85}, The divalent iron content converted to Fe2O3 is calculated. Fe-redox is more than 0%. This increases the efficiency of heat absorption by the molten glass when melting the glass raw materials, improving the meltability. As a method for preparing Fe-redox, for example, dissolution at low temperature and the use of oxidizing agents such as cerium oxide or chromium oxide. ox is preferably 1% or more, more preferably 2% or more, further preferably 3% or more, particularly It is preferably 4% or more, and most preferably 5% or more.

[0060] In addition, if the Fe-redox increases, the transmittance in the near infrared region may decrease. The Fe-redox is preferably 35% or less, more preferably 30% or less, and even more preferably 35% or less. More preferably, the ratio is 25% or less, even more preferably, 20% or less, and particularly preferably, 15% or less. Preferably, the difference is 10% or less.

[0061] When heat insulating performance is required, the glass plate according to the present invention contains 30% Fe-redox. More preferably, the ratio is 35% or more, and even more preferably, the ratio is 40% or more. More preferably, it is 45% or more, particularly preferably 50% or more, and most preferably 55% or more. By increasing the Fe-redox content to more than 30%, the heat insulation properties of the glass can be improved. Methods for increasing Fe-redox include dissolving at high temperatures and oxidizing. Examples include the use of reducing agents such as tin or coke.

[0062] When the glass plate according to the present invention contains SO3, in order to increase Fe-redox, When dissolved in a reducing atmosphere, sulfur (S) becomes negatively charged divalent sulfur. It may react with divalent iron in the gas to produce amber coloring and reduce the transmittance in the visible range. Therefore, the Fe-redox is preferably 80% or less, and more preferably is 75% or less, more preferably 70% or less, even more preferably 65% ​​or less, and particularly preferably It is preferably 60% or less, and most preferably 58% or less.

[0063] The glass plate according to the present invention preferably has a TiO2 content of 0.001% to 5%. If the TiO2 content is less than 0.001%, the glass plate of the present invention may be melted and melted. There is a risk of a bubble layer forming on the surface of the molten glass. If a bubble layer forms, the temperature of the molten glass will rise. The bubbles formed on the surface of the molten glass are difficult to remove, making it difficult to refine the glass, and causing a decrease in productivity. Titanium compounds are used as defoamers on the surface of the molten glass to thin or eliminate the layer. The titanium compound can be incorporated into the molten glass and reacted as TiO2. This titanium compound is an inorganic titanium compound (titanium tetrachloride, titanium oxide, etc.). The organic titanium compound may be, for example, Titanate ester or its derivatives, titanium chelate or its derivatives, titanium acylate Titanate or its derivatives, titanate oxalate, etc. The content of TiO2 is preferably Preferably, it is 0.005% or more, more preferably 0.01% or more, and particularly preferably 0.02% or more. % or more, more preferably 0.05% or more, and most preferably 0.06% or more. TiO2 has absorption in the ultraviolet range, so it can be added when it is necessary to block ultraviolet rays. In this case, the content of TiO2 is preferably 0.04% or more, more preferably It is preferably 0.1% or more, more preferably 0.2% or more, and particularly preferably 0.5% or more. However, if the TiO2 content is high, the liquidus temperature increases and devitrification may occur. In addition, it has absorption in the visible range and may cause yellow coloring, so the TiO2 content The content of TiO2 is preferably kept below 5%. The content of TiO2 is more preferably below 1%. More preferably, it is 0.5% or less, particularly preferably 0.3% or less, and even more preferably 0. It is preferably 2% or less, and most preferably 0.1% or less.

[0064] The glass plate according to the present invention is not suitable for use with infrared ray irradiating devices such as laser radar. If moisture is present in the glass, it will absorb light in the near infrared region, decreasing the transmittance in the near infrared region. However, it is not suitable for use with infrared irradiation equipment. The moisture in glass is generally in the β-OH value. β-OH is preferably 0.5 or less, more preferably 0.4 or less, and β-OH is preferably 0.5 or less, more preferably 0.4 or less. β-OH is more preferably 0.3 or less, and particularly preferably 0.2 or less. The transmittance of the glass plate measured using an infrared spectrophotometer (E-FTIR) is calculated using the following formula: This can be done. β-OH(mm -1 )=(1 / X)log 10 (T A / T B ) X: thickness of glass plate (mm) T A:Reference wave number 4000cm -1 Transmittance (%) T B : Hydroxyl group absorption wave number 3600cm -1 Minimum transmittance (%) near

[0065] The glass plate of the present invention has absorption in the near infrared region when moisture is present in the glass. Therefore, the heat insulating properties can be improved. To improve the heat insulating properties, the β-OH in the glass is 0. 05 or more is preferable, 0.07 or more is more preferable, 0.1 or more is even more preferable, and 0. A value of 15 or more is particularly preferred.

[0066] In the glass plate of the present invention, the composition ranges described in the following 10 aspects are further set, This is preferable because it provides excellent characteristics.

[0067] The glass plate according to aspect 1 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3≦9 0≦B2O3≦15 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦15 0≦Li2O<0.01 1.2≦Na2O≦15.6 3.5≦K2O≦12.5 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 4.7≦R2O≦19.5 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 42<7Al2O3+3MgO≦66 0.25≦Na2O / R2O≦0.8 R2O+B2O3≦23 0≦PbO<0.001 Including. By setting the range of the first aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0068] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in the first embodiment. The SiO2 content is preferably 57% or more in order to increase the Young's modulus and weather resistance. The ratio is preferably 60% or more. More preferably, it is 70% or less, further preferably, it is 68% or less, and particularly preferably, it is 66% or less. do. The content of Al2O3 is preferably 2% in order to increase the Young's modulus and weather resistance. More preferably, the percentage is 3% or more, more preferably 4% or more, and particularly preferably 5% or more. In order to increase the radio wave transmittance, it is more preferable to set it to 8% or less, and even more preferable to set it to 7% or less. More preferably, the ratio is 6% or less, particularly preferably 5% or less, and most preferably 4.5% or less. The following is the result. From the viewpoint of improving solubility and weather resistance, the content of MgO is preferably 0.1% or more. More preferably, it is 0.25% or more, and particularly preferably 0.4% or more. From this viewpoint, it is more preferable that the ratio is 13% or less, even more preferable that the ratio is 10% or less, and even more preferable that the ratio is 13% or less. is 7% or less, particularly preferably 5% or less, particularly preferably 4.5% or less, and particularly preferably or 4% or less, more preferably 3% or less, even more preferably 2% or less, most preferably is less than 1%.

[0069] The CaO content is set to 1% or more in order to improve solubility and increase radio wave transmittance. It is preferable that the content of the saturation layer is 2% or more, more preferably 4% or more, and particularly preferably 5% or more. The CaO content is 5% or more, more preferably 6% or more, and most preferably 8% or more. From the viewpoint of suppressing devitrification, 18% or less is more preferable, 16% or less is even more preferable, and 15% or less is still more preferable. Less than 14% is particularly preferred, less than 13% is even more preferred, and less than 12% is particularly preferred. Bottom is most preferred. SrO may be included to improve solubility and increase radio wave transmittance. When it is contained, its content is preferably 0.5% or more, and more preferably 1% or more. The SrO content is preferably 12% or less to prevent the glass from becoming brittle, and more preferably 1 0% or less is more preferable, 8% or less is particularly preferable, 5% or less is even more preferable, and 3% or less is particularly preferable. Lower is more preferred, and 2% or less is most preferred.

[0070] BaO may be included to improve solubility and increase radio wave transmittance. When it is contained, its content is preferably 0.5% or more, more preferably 1% or more, and particularly The content of BaO is preferably 1 to 2% in order to prevent the glass from becoming brittle. 2% or less is more preferable, 10% or less is even more preferable, 9% or less is particularly preferable, and 7% More preferably, it is 5% or less, even more preferably, and most preferably, it is 3% or less. The content of Na2O is more preferably in order to increase the solubility and adjust the average linear expansion coefficient. is 3% or more, more preferably 4% or more, particularly preferably 5% or more, and even more preferably 6% More preferably, it is 7% or more. Furthermore, if Na2O is contained, the weather resistance is deteriorated. Therefore, the content is more preferably 15% or less, further preferably 14% or less, and particularly preferably 15% or less. or 13% or less, more preferably 12% or less, even more preferably 11% or less, most preferably Preferably, it is 10% or less. The content of K2O is more preferably in order to increase the radio wave transmittance and adjust the average linear expansion coefficient. or 4% or more, more preferably 4.5% or more, particularly preferably 5% or more, and even more preferably The content is preferably 5.5% or more, and most preferably 6% or more. In addition, the weather resistance is deteriorated when K2O is contained. Therefore, the content is preferably 12% or less, and more preferably 11.5% or less. Less than 11%, particularly preferably less than 10.5%, and most preferably less than 10. % or less.

[0071] ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content is more preferably 0.5% or more. This is because the average linear expansion coefficient may become large. The content is more preferably 1.8% or less, and further preferably 1.5% or less. From the viewpoint of improving solubility, the content of R2O is preferably 5% or more, and more preferably 6% or more, more preferably 7% or more, even more preferably 8% or more, and particularly preferably On the other hand, in order to improve weather resistance, it is more preferably 18.5% or less. , more preferably 17% or less, even more preferably 16% or less, and particularly preferably 15% or less. % or less, and most preferably 14% or less.

[0072] From the viewpoint of improving solubility and radio wave transmittance, the content of RO is preferably 5% or less. More preferably, it is 7% or more, and particularly preferably 10% or more. From the viewpoint of suppressing devitrification, it is more preferably 19% or less, even more preferably 18% or less, and even more preferably 19% or less. More preferably, it is 17% or less, particularly preferably 16% or less, and most preferably 15% or less. be. The glass plate according to this embodiment has a composition of SiO2+Al2O3+MgO+CaO+SrO+B It is more preferable that aO+Li2O+Na2O+K2O+Fe2O3+TiO2≦100. This makes it possible to produce glass sheets using readily available glass raw materials.

[0073] 7Al2O3+3MgO is preferably 43% or more to increase radio wave transmittance. , more preferably 44% or more, particularly preferably 44.5% or more, and even more preferably 45% More preferably, 7Al2O3+3MgO is 45.5% or more. Preferably, it is 60% or less, more preferably, it is 58% or less, particularly preferably, it is 56% or less, and even more preferably It is preferably 52% or less, and most preferably 50% or less. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.3 or more. Preferably, the ratio is 0.35 or more, more preferably 0.4 or more, and even more preferably 0.43 or more. The Na2O / R2O ratio is most preferably 0.45 or more. 5 or less, more preferably 0.7 or less, particularly preferably 0.65 or less, and even more preferably 0 0.6 or less, and most preferably 0.55 or less.

[0074] In the first aspect of the present invention, SiO2+Al2O3 is preferably 50% or more, more preferably Preferably, it is 55% or more, particularly preferably 60% or more, even more preferably 65% ​​or more, and even more preferably It is preferably 67% or more, and most preferably 68% or more. is preferably 80% or less, more preferably 78% or less, particularly preferably 76% or less, More preferably, it is 74% or less, and most preferably, it is 72% or less. It is preferable to lower the R2O×MgO content in order to increase the radio wave transmittance. If no R2O is contained, the upper limit of R2O×MgO is preferably larger, and is preferably 250%. 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O+B2O3 is preferably 23% or less. is 22% or less, more preferably 21% or less, even more preferably 20% or less, and even more preferably Preferably, the content is 19% or less, and most preferably, 18.5% or less. However, if R2O+B2O3 is low, If the temperature is too high, the glass viscosity during melting and molding may become too high, making manufacturing difficult. Therefore, R2O+B2O3 is preferably 1% or more, more preferably 4% or more, and even more preferably 1% or more. More preferably, it is 8% or more, even more preferably, it is 10% or more, and most preferably, it is 12% or more. . Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, the content of B2O3 is preferably 15% or less, more preferably 12% or less, and even more preferably 15% or less. Preferably, it is 10% or less, more preferably, it is 7% or less, even more preferably, it is 5% or less, and even more preferably, it is 10% or less. More preferably, it is 4% or less, even more preferably, it is 3% or less, even more preferably, it is 2% or less, and most preferably Preferably, it is 1% or less. In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The content of MgO+CaO is more preferably 20% or less, even more preferably 18% or less, and particularly preferably Preferably, the ratio is 16% or less, more preferably 15% or less, even more preferably 14% or less, and most preferably However, if the MgO+CaO ratio is too low, the amount of gallium oxide during melting and molding may increase. The glass viscosity becomes too high, which may make manufacturing difficult, so MgO+CaO is limited to 1%. More preferably, the ratio is 2% or more, even more preferably, 4% or more, and still more preferably, 5% or more, even more preferably 7% or more, most preferably 9% or more, even more preferably More than 10%. By satisfying these conditions, the glass sheet can obtain high radio wave transmittance in the high frequency band. It is possible.

[0075] The glass plate according to aspect 2 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3≦6 0≦B2O3≦15 0≦MgO≦14 0≦CaO≦20 0≦SrO≦15 0≦BaO≦15 0≦Li2O<0.01 4≦Na2O≦17 1.9≦K2O≦14.2 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦3 5.9≦R2O≦20 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 23.5<7Al2O3+3MgO≦42 0.22≦Na2O / R2O≦0.85 R2O×MgO≦66 55≦SiO2+Al2O3≦76 0≦PbO<0.001 Including. By setting the range of the second aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0076] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in the second embodiment. The SiO2 content is preferably 60% in order to increase the Young's modulus and weather resistance. More preferably, it is 65% or more, even more preferably, it is 66% or more, and particularly preferably 67% or more, most preferably 68% or more, and from the viewpoint of improving viscosity, more preferably 7 4% or less, more preferably 73% or less, particularly preferably 72% or less, and most preferably 7 It's less than 1%. The content of Al2O3 is preferably 0.5 to 1.5 in order to increase the Young's modulus and weather resistance. 5% or more, more preferably 1% or more, particularly preferably 1.5% or more, and most preferably 2 % or more, and in order to increase the radio wave transmittance, it is more preferable that it is 5% or less, and even more preferable that it is 10% or less. It is preferably 4% or less, and more preferably 3% or less. From the viewpoint of improving solubility and weather resistance, the content of MgO is preferably 0.1% or more. , more preferably 0.25% or more, and particularly preferably 0.35% or more. From the viewpoint, 13% or less is more preferable, 10% or less is even more preferable, 9% or less, even more preferably 7% or less, particularly preferably 5% or less, and most particularly preferably or 4% or less, more preferably 3% or less, even more preferably 2% or less, most preferably is less than 1%.

[0077] The CaO content is set to 1% or more in order to improve solubility and increase radio wave transmittance. It is preferable that the content of the saturation layer is 3% or more, more preferably 4% or more, and particularly preferably 5% or more. The CaO content is 6% or more, more preferably 8% or more, and most preferably 10% or more. From the viewpoint of suppressing devitrification, it is more preferably 18% or less, further preferably 17% or less, and % or less is particularly preferred, 15% or less is even more preferred, and 14% or less is most preferred. SrO may be included to improve solubility and to increase radio wave transmittance. When SrO is contained, the content is preferably 0.5% or more, and more preferably The SrO content is preferably 12% or less to prevent the glass from becoming brittle. More preferably, it is 10% or less, even more preferably, it is 7% or less, and even more preferably, it is 4% or less. It is preferable that the content is 2% or less, and most preferable that the content is 2% or less.

[0078] BaO may be included to improve solubility and increase radio wave transmittance. When it is contained, it is preferably 0.5% or more, more preferably 1% or more, and particularly The content of BaO is preferably 12% or more to prevent the glass from becoming brittle. % or less is more preferable, 10% or less is even more preferable, 8% or less is particularly preferable, and 5% or less is particularly preferable. More preferably, the concentration is less than 3%, and most preferably, the concentration is less than 3%. In order to ensure solubility while also increasing radio wave transmittance, the Na2O content is 4% to 17%. By setting the ratio in this range, the range of Na2O / R2O and R2O×Mg The Na2O content is more favorable because it is easier to maintain the range of Na2O in an appropriate range. It is preferably 4.5% or more, more preferably 5% or more, and most preferably 6% or more. In addition, the content of Na2O is more preferably 16% or less, further preferably 14% or less, particularly It is preferably 12% or less, more preferably 11% or less, and most preferably 10% or less.

[0079] In order to increase the radio wave transmittance, the content of K2O is preferably 2% or more, and even more preferably 10% or more. Preferably, the ratio is 3.5% or more, more preferably 4% or more, and particularly preferably 5% or more. Preferably, it is 5.5% or more, most preferably 6% or more, and more preferably 13.5% or more. More preferably 12% or less, particularly preferably 11% or less, and even more preferably 10.5% or less. % or less, and most preferably 10% or less. ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content is more preferably 0.5% or more. This is because the average linear expansion coefficient may become large. The content of ZrO2 is more preferably 1.8% or less, and further preferably 1.5% or less. be.

[0080] From the viewpoint of improving solubility, the content of R2O is more preferably 7% or more, and even more preferably The content is preferably 8% or more, and more preferably 10% or more. More preferably, the ratio is 18% or less, further preferably, the ratio is 16% or less, and further preferably, the ratio is 14% or less. It is particularly preferably 13% or less, and most preferably 12% or less. From the viewpoint of improving solubility and radio wave transmittance, the content of RO is preferably 2% or less. More preferably, the ratio is 5% or more, even more preferably 7% or more, and even more preferably It is preferably 8% or more, and more preferably 10% or more. On the other hand, from the viewpoint of improving weather resistance and suppressing devitrification, , more preferably 19% or less, even more preferably 18% or less, and even more preferably 17% or less. % or less, particularly preferably 16% or less, and most preferably 15% or less.

[0081] The glass plate according to the second aspect has a composition ratio of SiO2+Al2O3+MgO+CaO+SrO+B It is more preferable that aO+Li2O+Na2O+K2O+Fe2O3+TiO2≦100. This makes it possible to produce glass sheets using readily available glass raw materials. 7Al2O3+3MgO is preferably 24% or more to increase radio wave transmittance. , more preferably 25% or more, particularly preferably 26% or more, and even more preferably 28% or more. , and most preferably 30% or more. 7Al2O3+3MgO is more preferably 40% or less, more preferably 38% or less, particularly preferably 37% or less, and even more preferably It is preferably 36% or less, and most preferably 35% or less. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.3 or more. Preferably, the ratio is 0.35 or more, more preferably 0.4 or more, and most preferably 0.45 or more. Moreover, Na2O / R2O is more preferably 0.8 or less, and further preferably 0.7 or less. 5 or less, particularly preferably 0.7 or less, even more preferably 0.6 or less, and most preferably 0.5 5 or less.

[0082] SiO2+Al2O3 is used to improve the solubility and the radio wave transmittance. More preferably, it is 60% or more, further preferably, it is 65% or more, particularly preferably, it is 67% or more, and most preferably, it is 60% or more. The ratio of SiO2+Al2O3 is preferably 76% or less. , more preferably 75% or less, even more preferably 74% or less, and particularly preferably 73% or less , and most preferably 72% or less. It is preferable to keep R2O×MgO low in order to increase the radio wave transmittance. O is preferably 66% 2 Less than or equal to 60%, more preferably 2 Less than or equal to 50% 2Less than 40%, particularly preferably 2 Less than 30%, more preferably 2 The following is most preferably 2 5% 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O+B2O3 is preferably 30% or less, more preferably 28% or less, and even more preferably 28% or less. Preferably, the ratio is 25% or less, more preferably 20% or less, and even more preferably 18% or less. The most preferable ratio is 16% or less. However, if R2O+B2O3 is too low, the dissolution rate will decrease. R2O+B is used because the glass viscosity during molding may become too high, making manufacturing difficult. 2O3 is preferably 1% or more, more preferably 2% or more, and further preferably 3% or more. Preferably, the thickness is 4% or more, even more preferably 6% or more, and most preferably 8% or more.

[0083] Due to the high Na2O content, boron and alkali elements are volatilized during melting and molding. In order to prevent deterioration of glass quality, the B2O3 content is preferably 15% or less. The content of O3 is more preferably 12% or less, even more preferably 10% or less, and even more preferably is less than or equal to 8%, even more preferably less than or equal to 6%, and most preferably less than or equal to 5%. In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The MgO+CaO content is preferably 18% or less, more preferably 16% or less, and even more preferably The content is preferably 14% or less, and most preferably 12% or less. However, if the MgO+CaO content becomes low, If the temperature is too high, the glass viscosity during melting and molding may become too high, making manufacturing difficult. Therefore, MgO+CaO is preferably 1% or more, more preferably 2% or more, and even more preferably It is preferably 3% or more, more preferably 4% or more, and most preferably 5% or more. The glass plate according to the second aspect is prone to devitrification, so the TiO2 content is set to 3% or less. It is preferable that the ratio is 2% or less, more preferably 1% or less, and particularly preferably 0.5 % or less, more preferably 0.2% or less, and most preferably 0.1% or less.

[0084] The glass plate according to aspect 3 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 1.3≦Al2O3≦3.35 0≦B2O3≦15 0≦MgO≦4.8 0≦CaO≦20 0≦SrO≦4 0≦BaO≦15 0≦Li2O<0.01 0.1≦Na2O≦16 1≦K2O≦16 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦1.5 1.1≦R2O≦20 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 0≦7Al2O3+3MgO≦23.5 0.05≦Na2O / R2O≦0.8 0≦R2O+B2O3≦22 0≦PbO<0.001 0≦ZnO≦8 Including. By setting the range of the third aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0085] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in the third embodiment. The SiO2 content is preferably 60% in order to increase the Young's modulus and weather resistance. More preferably, the viscosity is 65% or more, and particularly preferably, the viscosity is 68% or more. Therefore, the SiO2 content is more preferably 74% or less, and further preferably 73.5% or less. The content is preferably 73% or less, and more preferably 72.5% or less. In order to increase the Young's modulus and weather resistance, Al2O3 is preferably 1.5% or more. More preferably, it is 1.7% or more, particularly preferably, it is 1.9% or more, and most preferably, it is 2% or more. In order to increase the radio wave transmittance, it is more preferably 3.0% or less, and even more preferably Preferably, it is 2.5% or less.

[0086] From the viewpoint of improving solubility and weather resistance, the content of MgO is preferably 0.1% or more. More preferably, it is 0.25% or more, and particularly preferably 0.5% or more. From this viewpoint, the content of MgO is more preferably 4% or less, further preferably 3% or less, particularly It is preferably 2% or less, and most preferably 1% or less. The CaO content is preferably 1% or more in order to improve the solubility and increase the radio wave transmittance. More preferably, the content is 2% or more, still more preferably 4% or more, and particularly preferably 5% or more. The CaO content is more preferably 6% or more, and most preferably 8% or more. From this viewpoint, 18% or less is more preferable, 16% or less is even more preferable, and 15% or less is particularly preferable. Preferably, the content is 14% or less, more preferably, 13% or less.

[0087] BaO may be contained to improve solubility and increase radio wave transmittance. When contained, the content is preferably 0.5% or more, and more preferably 1% or more. and more preferably 2% or more. The content of BaO is to prevent the glass from becoming brittle. Therefore, 12% or less is more preferable, 10% or less is even more preferable, and 9% or less is even more preferable. More preferably, 8% or less is particularly preferred, 4% or less is even more particularly preferred, and 3% or less is the most preferred. is also preferred. The content of Na2O is more preferably in order to increase the solubility and adjust the average linear expansion coefficient. is 2% or more, more preferably 4% or more, particularly preferably 5% or more, and even more preferably 6% More preferably, it is 7% or more. Furthermore, if Na2O is contained, the weather resistance is deteriorated. Therefore, the content is more preferably 15% or less, further preferably 14% or less, and particularly preferably 15% or less. Preferably, it is 13% or less, more preferably 12% or less, and most preferably 11% or less. The content of K2O is preferably 1.5% or more in order to increase the radio wave transmittance. is preferably 2% or more, particularly preferably 2.5% or more, and most preferably 3% or more; More preferably 13% or less, even more preferably 11% or less, particularly preferably 10% or less, More preferably, it is 9% or less, and most preferably, it is 8% or less.

[0088] ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content of ZrO2 is preferably 0.5% or more. Therefore, it is more preferably 1.8% or less, and even more preferably 1.5% or less. It is. From the viewpoint of improving solubility, R2O is more preferably 5% or more, and even more preferably It is preferably 6% or more, more preferably 8% or more, and most preferably 10% or more. In order to improve the above, the ratio is more preferably 19% or less, further preferably 17% or less, and More preferably, it is 15% or less, particularly preferably, it is 14.5% or less, and most preferably, it is 14% or less. It is. From the viewpoint of improving solubility and radio wave transmittance, RO is preferably 5% or more. More preferably, it is 6% or more, and particularly preferably 9% or more. From the viewpoint of suppressing permeation, it is more preferably 18% or less, even more preferably 16% or less, and even more preferably More preferably, it is 15% or less, particularly preferably, it is 13% or less, and most preferably, it is 12% or less. .

[0089] 7Al2O3+3MgO is preferably 0.5% or less to increase radio wave transmittance. More preferably, the content is 1% or more, particularly preferably 5% or more, and even more preferably 8% or more. The content of 7Al2O3+3MgO is preferably 23% or more. % or less, more preferably 22.5% or less, and even more preferably 22% or less. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.1 or more. Preferably, the ratio is 0.15 or more, more preferably 0.2 or more, and even more preferably 0.25 or more. The Na2O / R2O ratio is most preferably 0.3 or more. More preferably, it is 0.7 or less, particularly preferably, it is 0.65 or less, and particularly preferably, it is 0.7 or less. It is preferably 0.6 or less, and most preferably 0.55 or less. SiO2+Al2O3 is more preferably 50% or more, and even more preferably 55% or more. Particularly preferably 60% or more, even more preferably 65% ​​or more, and even more preferably 68% or more SiO2+Al2O3 is more preferably 71% or more. 80% or less, more preferably 78% or less, particularly preferably 76% or less, and even more preferably It is preferably 75% or less, and most preferably 74% or less.

[0090] It is preferable to lower the R2O×MgO ratio in order to increase the radio wave transmittance. MgO is preferably 80% 2 Less than or equal to 60%, more preferably 2 Less than 40, more preferably % 2 Less than 30%, particularly preferably 2 Less than 20%, more preferably 2 The following is most preferably 10% 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O+B2O3 is preferably 22% or less, more preferably 20% or less, and even more preferably 20% or less. Preferably, it is 18.5% or less, more preferably, it is 18% or less, and most preferably, it is 16% or less. However, if the R2O+B2O3 ratio is too low, the glass viscosity during melting and molding will increase. If the amount is too much, it may become difficult to manufacture. Therefore, it is preferable that R2O+B2O3 is 1% or more. More preferably, the content is 2% or more, even more preferably, 4% or more, and even more preferably, 6% or more. Most preferably, it is 8% or more. In the third embodiment, the Na2O component in the glass increases relative to the total alkali content. This prevents boron and alkali elements from volatilizing during melting and molding, which can lead to a deterioration in glass quality. In order to prevent this, the content of B2O3 is preferably 15% or less, more preferably 10% or less, and even more preferably 10% or less. It is preferably 8% or less, more preferably 6% or less, and most preferably 5% or less. The glass plate according to the third aspect has a composition ratio of SiO2+Al2O3+MgO+CaO+SrO+B It is more preferable that aO+Li2O+Na2O+K2O+Fe2O3+TiO2≦100. This makes it possible to produce glass sheets using readily available glass raw materials. In addition, in the case of the glass of the present invention, which has a composition with a small amount of Al2O3 and MgO, the weather resistance of the glass plate is In order to ensure the stability, the total amount is preferably 98% or more. The optical transparency is preferably 98.5% or more, and more preferably 99% or more. Since coloring agents, clarifying agents, etc. are added, the upper limit of the total amount is more preferably 99.9%. In addition, in the third embodiment, the amount of Al2O3 and MgO is small, so the glass becomes brittle and the strength is low. In order to prevent the glass from falling or to reduce the weight of the glass plate, it is preferable that the SrO content is 4% or less. More preferably, it is 2.5% or less, further preferably, it is 2% or less, and particularly preferably, it is substantially Not contained.

[0091] In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The MgO+CaO content is preferably 18% or less, more preferably 16% or less, and even more preferably 14% or less, more preferably 13% or less, and most preferably 12% or less. However, Mg If the O+CaO ratio is too low, the glass viscosity during melting and molding will be too high, making production difficult. Therefore, MgO + CaO is preferably 1% or more, more preferably 2% or more. More preferably, the content is 3% or more, even more preferably, 4% or more, and most preferably, 5% or more. do. The glass sheet according to aspect 3 is particularly prone to devitrification, so the TiO2 content is 1. It is preferably 5% or less, more preferably 1% or less, further preferably 0.5% or less, and particularly preferably Preferably, it is 0.2% or less, more preferably, it is 0.1% or less, and most preferably, it is 0.05% or less. be. The glass plate according to the third embodiment may contain ZnO since it has an effect of suppressing devitrification. If it is contained in the float bath, defects may occur during manufacturing, so the content of ZnO is The amount is preferably 8% or less, more preferably 6% or less, more preferably 4% or less, and even more preferably Preferably, it is 3% or less, more preferably, it is 2% or less, even more preferably, it is 1% or less, and even more preferably, it is 2% or less. More preferably, it is 0.5% or less.

[0092] The glass plate according to aspect 4 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 1.44≦Al2O3≦9 0≦B2O3≦2 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦1 0.01≦Li2O≦19.1 0≦Na2O≦16 0.9≦K2O≦16 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 0.91≦R2O≦20 0≦RO≦20 98≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 10<7Al2O3+3MgO-4Li2O≦66 0≦Na2O / R2O≦0.8 0≦PbO<0.001 Including. By setting the range of the fourth aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0093] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in embodiment 4. The SiO2 content is preferably 60% in order to increase the Young's modulus and weather resistance. More preferably, it is 64% or more, and particularly preferably 65% ​​or more. More preferably, the ratio is 72% or less, even more preferably 70% or less, and particularly preferably 68%. The following is the result. The content of Na2O is more preferably in order to increase the solubility and adjust the average linear expansion coefficient. is 2% or more, more preferably 3% or more, even more preferably 4% or more, and particularly preferably 5% More preferably, it is 6% or more, and more preferably, it is 15% in order to improve weather resistance. or less, more preferably 14% or less, particularly preferably 13% or less, and even more preferably 12% or less It is even more preferably 10% or less, and most preferably 9% or less.

[0094] In order to increase the radio wave transmittance, the content of K2O is preferably 1% or more, and more preferably 1% or more. Preferably, it is 1.5% or more, particularly preferably 2% or more, even more preferably 2.5% or more, and most preferably It is preferably 3% or more, more preferably 15% or less, even more preferably 13% or less, and particularly preferably 15% or less. It is preferably 12% or less, more preferably 10% or less, and most preferably 9% or less. The content of Li2O is increased to increase the solubility and Young's modulus, and to improve the radio wave transmittance. More preferably, it is 1% or more, even more preferably, it is 2% or more, particularly preferably, it is 3% or more, and even more preferably The content is preferably 4% or more. Since Li2O may cause devitrification and phase separation, the content The amount is more preferably 15% or less, even more preferably 12% or less, and particularly preferably 10%. It is more preferably 8% or less, and most preferably 7% or less. SrO may be included to improve solubility and to increase radio wave transmittance. When SrO is contained, the content is preferably 0.5% or more, and more preferably The SrO content is 1% or more, and particularly preferably 2% or more. The SrO content is such that the glass becomes brittle. In order to prevent this, 12% or less is more preferable, 10% or less is even more preferable, and 8% or less is particularly preferable. It is preferable that the content is 6% or less, more preferable that the content is 6% or less, and most preferable that the content is 4% or less.

[0095] 7Al2O3+3MgO-4Li2O is more preferable for increasing radio wave transmittance. is 12 or more, more preferably 14 or more, particularly preferably 16 or more, and even more preferably 18 or more. More preferably, it is 20 or more. In addition, 7Al2O3+3MgO-4Li2O is More preferably, it is 60 or less, even more preferably, it is 55 or less, particularly preferably, it is 50 or less, and even more preferably It is preferably 45 or less, and most preferably 40 or less. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.05 or more. More preferably, it is 0.1 or more, particularly preferably, it is 0.15 or more, and even more preferably, it is 0.2 or more. The Na2O / R2O ratio is most preferably 0.25 or more. Less than 0.75, more preferably less than 0.7, particularly preferably less than 0.7, and even more preferably 0. It is preferably 6 or less, and most preferably 0.5 or less.

[0096] In the fourth embodiment, in order to lower the glass viscosity during melting and molding and to facilitate production, Si O2+Al2O3 is preferably 50% or more, more preferably 60% or more, and particularly preferably It is preferably 65% ​​or more, more preferably 66% or more, and most preferably 68% or more. SiO2+Al2O3 is preferably 75% or less, more preferably 74% or less, and particularly preferably It is preferably 73% or less, more preferably 72% or less, and most preferably 71% or less. It is easy to manufacture by lowering the glass viscosity during melting and molding, and also has high radio wave transmittance. Therefore, the content of Al2O3 is preferably 9% or less, more preferably 8% or less, and further preferably 10% or less. or 7% or less, particularly preferably 6% or less, even more preferably 5% or less, and most preferably 4% or less. % or less, and in order to ensure weather resistance, it is more preferably 1.5% or more, and even more preferably is preferably 2% or more, and more preferably 2.5% or more. In order to increase the radio wave transmittance, K2O / R2O is preferably 0.05 or more. Preferably, the ratio is 0.1 or more, more preferably 0.15 or more, even more preferably 0.2 or more, and most preferably 0.5 or more. The K2O / R2O ratio is preferably 0.25 or more. More preferably, it is 0.9 or less, particularly preferably 0.7 or less, and even more preferably 0.5 or less. Preferably, the ratio is 0.4 or less, and most preferably, 0.4 or less.

[0097] In the fourth aspect, in order to increase the radio wave transmittance, it is preferable to lower R2O×MgO. R2O×MgO is preferably 200% 2 Less than or equal to 180%, more preferably 2 below , and more preferably 160% 2 Below 140%, particularly preferably 2 More preferably, 20 or less, more preferably 100% 2 Below 80%, most preferably 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O + B2O3 is preferably 19% or less, more preferably 18.5% or less. More preferably, it is 18% or less, even more preferably, it is 17% or less, and most preferably, it is 16% or less. However, if the R2O+B2O3 ratio is too low, the glass viscosity during melting and molding will increase. If the amount is too much, it may be difficult to manufacture, so R2O+B2O3 is preferably 1% or more. , more preferably 2% or more, even more preferably 3% or more, even more preferably 4% or more, and most preferably It is preferably 5% or more. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, the content of B2O3 is preferably 2% or less, more preferably 1.8% or less, and even more preferably 1.8% or less. Preferably, it is 1.5% or less, more preferably, it is 1.0% or less, and most preferably, it is 0.5% or less. It is.

[0098] In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The MgO+CaO content is preferably 20% or less, more preferably 18% or less, and even more preferably 16% or less, more preferably 15% or less, and most preferably 14% or less. However, Mg If the O+CaO ratio is too low, the glass viscosity during melting and molding will be too high, making production difficult. Therefore, MgO + CaO is preferably 1% or more, more preferably 2% or more. More preferably, it is 4% or more, even more preferably, it is 6% or more, and most preferably, it is 8% or more. be. In addition, to prevent the glass from becoming brittle and losing strength, or to reduce the weight of the glass sheet, The content of aO is preferably 1% or less, more preferably 0.5% or less, and further preferably 0. It is preferably 0.1% or less, and more preferably substantially none. As mentioned above, to prevent glass from becoming brittle and losing strength, or to reduce the weight of glass sheets. Therefore, the content of SrO+BaO+ZrO2 is preferably 8% or less, more preferably 7% or less, and even more preferably 8% or less. More preferably, it is 6% or less, particularly preferably, it is 5% or less, even more preferably, it is 3% or less, and most preferably, it is 5% or less. Preferably, it is 2% or less. Furthermore, in order to increase the radio wave transmittance, it is more preferable that the MgO content is 14% or less, and even more preferable that the MgO content is 14% or less. Preferably, it is 12% or less, particularly preferably, it is 10% or less, even more preferably, it is 8% or less, and even more preferably It is preferably 6% or less, and most preferably 4.5% or less. In order to improve solubility and increase radio wave transmittance, the CaO content is set at 0.5% or more. It is preferable that the amount of the oxidized layer is 1% or more, more preferably 3% or more, and particularly preferably 1% or more. It is preferably 5% or more, more preferably 7% or more, and most preferably 8% or more, from the viewpoint of suppressing devitrification. From this viewpoint, 18% or less is more preferable, 16% or less is even more preferable, and 14% or less is particularly preferable. It is preferably 13% or less, more preferably 12% or less.

[0099] ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content is more preferably 0.5% or more. In addition, there is a risk that the average linear expansion coefficient becomes large. Therefore, the content is more preferably 1.8% or less, and further preferably 1.5% or less. From the viewpoint of improving the solubility, the content of R2O is preferably 5% or more, more preferably 6% or more. % or more, more preferably 7% or more, and particularly preferably 8% or more. In order to improve the above, it is more preferable that the ratio is 18% or less, further preferably 17% or less, and further preferably 18% or less. More preferably, it is 16% or less, particularly preferably, it is 15% or less, and most preferably, it is 14% or less. . From the viewpoint of improving solubility and radio wave transmittance, RO is preferably 5% or more. More preferably, it is 6% or more, and particularly preferably 8% or more. From the viewpoint of suppressing permeation, it is more preferably 19% or less, even more preferably 18% or less, and even more preferably 19% or less. More preferably, it is 17% or less, particularly preferably, it is 16% or less, and most preferably, it is 15% or less. .

[0100] The glass plate according to aspect 5 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3≦7.8 0≦B2O3≦2 0≦MgO≦11.8 2≦CaO≦20 0≦SrO≦15 0≦BaO≦1 2.5≦Li2O≦19.52 0.15≦Na2O≦17.17 0.33≦K2O≦16.5 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 2.98≦R2O≦20 2≦RO≦20 98≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 -10<7Al2O3+3MgO-4Li2O≦10 0.05≦Na2O / R2O≦0.85 0.11≦K2O / R2O≦0.83 0≦PbO<0.001 Including. By setting the range of the fifth aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0101] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in the fifth embodiment. The SiO2 content is preferably 60% in order to increase the Young's modulus and weather resistance. More preferably, the viscosity is 63% or more, and particularly preferably, the viscosity is 65% or more. From the above, more preferably 73% or less, more preferably 71% or less, and even more preferably 70% The ratio is particularly preferably 69% or less. The content of Na2O is more preferably in order to increase the solubility and adjust the average linear expansion coefficient. is 0.5% or more, more preferably 1% or more, more preferably 2% or more, more preferably 3 % or more, more preferably 4% or more, and particularly preferably 5% or more. In order to increase the amount of the saturation, the amount is more preferably 15% or less, further preferably 13% or less, and particularly preferably 15% or less. is less than 11%, more preferably less than 10%, and most preferably less than 8%. The content of K2O is preferably 0.5% or more in order to increase the radio wave transmittance. Preferably, it is 2% or more, more preferably, it is 3% or more, particularly preferably, it is 4% or more, and even more preferably It is preferably 5% or more, and most preferably 6% or more. From the viewpoint of improving viscosity, it is more preferably 1% or more. 6% or less, more preferably 14% or less, particularly preferably 12% or less, and even more preferably 1 It is preferably 1% or less, and most preferably 10% or less.

[0102] The content of Li2O is increased to increase the solubility and Young's modulus, and to improve the radio wave transmittance. It is more preferably 3% or more, further preferably 4% or more, and particularly preferably 5% or more. In addition, since there is a concern that Li2O may cause devitrification and phase separation, the content of Li2O is preferably 15 % or less, more preferably 12% or less, particularly preferably 10% or less, and even more preferably 8% or less. The most preferable range is 7% or less. 7Al2O3+3MgO-4Li2O is more preferable for increasing radio wave transmittance. is -9 or more, more preferably -6 or more, particularly preferably -4 or more, and even more preferably -2 or more, and most preferably -1 or more. In addition, 7Al2O3+3MgO-4Li2O is More preferably 9.5 or less, even more preferably 9 or less, and particularly preferably 8.5 or less. Preferably, it is 8 or less.

[0103] SrO may be included to improve solubility and to increase radio wave transmittance. When SrO is contained, the content is preferably 0.5% or more, and more preferably The SrO content is 1% or more, and particularly preferably 2% or more. The SrO content is such that the glass becomes brittle. In order to prevent this, 12% or less is more preferable, 10% or less is even more preferable, and 8% or less is particularly preferable. It is preferable that the content is 6% or less, more preferable that the content is 6% or less, and most preferable that the content is 4% or less. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.1 or more. Preferably, the ratio is 0.15 or more, more preferably 0.2 or more, and even more preferably 0.25 or more. The Na2O / R2O ratio is most preferably 0.3 or more. The Na2O / R2O ratio is more preferably 0.9 or more. More preferably, it is 0.8 or less, particularly preferably 0.7 or less, and even more preferably 0.6 or less. Preferably, the ratio is 0.5 or less, and most preferably 0.5 or less.

[0104] In the fifth embodiment, SiO2+Al2O3 is more preferably 50% or more, and even more preferably Preferably, the content is 55% or more, more preferably 60% or more, even more preferably 65% ​​or more, and even more preferably The content of SiO2+Al2O3 is preferably 67% or more, and most preferably 68% or more. More preferably, the ratio is 80% or less, further preferably, 78% or less, and particularly preferably, 76% or less. Preferably, the layer is 75% or less, more preferably 74% or less, and even more preferably 73% or less. Most preferably, it is 72.5% or less. In order to make manufacturing easier by lowering the glass viscosity during melting and molding, and to increase the radio wave transmittance, In order to reduce the amount of Al2O3, the content of Al2O3 is preferably 7% or less, and more preferably 6% or less. More preferably, the ratio is 5% or less, more preferably 4.5% or less, and even more preferably 3% or less. The lower limit of Al2O3 is not particularly limited, but the lower limit of Al2O3 is preferably 3.5% or less. In order to ensure the above properties, the content of Al2O3 is preferably 0.5% or more, and more preferably 1.5% or more. or 1% or more, particularly preferably 1.5% or more, and particularly preferably 1.8% or more; More preferably, it is 2% or more, and most preferably, it is 2.5% or more. In order to increase the radio wave transmittance, K2O / R2O is preferably 0.15 or more. Preferably, the ratio is 0.2 or more, more preferably 0.25 or more, and even more preferably 0.28 or more. The K2O / R2O ratio is most preferably 0.3 or more. The K2O / R2O ratio is more preferably 0.80 or more. More preferably, it is 0.7 or less, particularly preferably 0.6 or less, and even more preferably 0.5 or less. The ratio of Na2O / R2O and K2O / R2O is preferably 0.4 or less. By setting the range, it is possible to easily increase the radio wave transmittance, which is preferable.

[0105] In the fifth aspect, the ratio of R2O×MgO is preferably low in order to increase the radio wave transmittance. R2O×MgO is preferably 200% 2 Less than or equal to 150% 2 below , more preferably 130% 2 Less than or equal to 120% 2 More preferably, 1 00% or less 2, and even more preferably 80% 2 Less than 60%, especially preferred 2 Below, more Preferably 40% 2 Below 30%, most preferably 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O + B2O3 is preferably 19% or less. R2O + B2O3 is more preferably is 18.5% or less, more preferably 18% or less, even more preferably 17% or less, and most preferably However, if the R2O+B2O3 ratio is too low, the The glass viscosity may become too high, making manufacturing difficult. 3 is preferably 1% or more, more preferably 2% or more, even more preferably 4% or more, and even more preferably It is preferably 6% or more, and most preferably 8% or more. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, the content of B2O3 is preferably 2% or less. It is preferably 1.5% or less, more preferably 1% or less, and most preferably 0.5% or less. In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The MgO+CaO content is preferably 17% or less, more preferably 15% or less, and even more preferably It is preferably 14% or less, and more preferably 13% or less. However, if the MgO+CaO ratio becomes too low, Otherwise, the glass viscosity during melting and molding may become too high, making manufacturing difficult. MgO+CaO is preferably 1% or more, more preferably 2% or more, and even more preferably 4% or more. It is preferably 6% or more, more preferably 6% or more, and most preferably 8% or more.

[0106] In addition, to prevent the glass from becoming brittle and losing its strength, or to reduce the weight of the glass sheets, BaO is preferably 1% or less, more preferably 0.8% or less, and even more preferably 0.5% or less. It is preferably not more than 0.1%, and more preferably not more than 0.1%, and particularly preferably not contained at all. As mentioned above, to prevent glass from becoming brittle and losing strength, or to reduce the weight of glass sheets. Therefore, the content of SrO+BaO+ZrO2 is preferably 12% or less, and more preferably 10% or less. % or less, particularly preferably 8% or less, even more preferably 4% or less, and most preferably 2% or less. It is. Furthermore, in order to increase the radio wave transmittance, the content of MgO is preferably 11.8% or less. More preferably, the ratio is 10% or less, further preferably 7% or less, and particularly preferably 6% or less. Preferably, the layer is 5% or less, more preferably, the layer is 4% or less, more preferably, the layer is 3% or less, From the viewpoint of improving the solubility, the content is preferably 0% or more, and more preferably 0.1% or more. is more preferable, 0.3% or more is even more preferable, and 0.5% or more is particularly preferable. In order to improve the solubility and increase the radio wave transmittance, the CaO content is set to 2% or more. It is preferable that the ratio is 3% or more, more preferably 4% or more, and particularly preferably 5% or more. The CaO content is 5% or more, more preferably 6% or more, and most preferably 8% or more. From the viewpoint of suppressing devitrification, it is more preferably 18% or less, further preferably 17% or less, It is particularly preferably 6% or less, more preferably 14% or less, and most preferably 12% or less.

[0107] ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content is more preferably 0.5% or more. Therefore, it is more preferably 1.8% or less, and further preferably 1.5% or less. From the viewpoint of improving solubility, the content of RO is preferably 5% or more, more preferably 6% or more. More preferably, it is 7% or more, further preferably 9% or more, and particularly preferably 10% or more. On the other hand, in order to improve weather resistance, it is more preferably 18% or less, and even more preferably 16.5% or less, even more preferably 15.5% or less, particularly preferably 14.5% or less , and most preferably 13.5% or less. From the viewpoint of improving solubility and radio wave transmittance, RO is preferably 5% or more, and more preferably 5% or more. It is preferably 7% or more, particularly preferably 8% or more, and most preferably 10% or more. On the other hand, from the viewpoint of improving weather resistance and suppressing devitrification, it is more preferably 19% or less, and even more preferably 18% or less, even more preferably 17% or less, particularly preferably 16% or less, most preferably Most are 14% or less.

[0108] The glass plate according to embodiment 6 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3≦5.5 0≦B2O3≦2 0≦MgO≦10.5 0≦CaO≦20 0≦SrO≦15 0≦BaO≦15 2.5≦Li2O≦20 0≦Na2O≦18.5 0≦K2O≦18.5 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 2.5≦R2O≦20 0≦RO≦20 98≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 -60≦7Al2O3+3MgO-4Li2O≦-10 0≦PbO<0.001 Including. By setting the range of the sixth aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0109] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in the sixth embodiment. The SiO2 content is preferably 60% in order to increase the Young's modulus and weather resistance. More preferably, the viscosity is 63% or more, and particularly preferably, the viscosity is 65% or more. More preferably, the ratio is 72% or less, further preferably 71% or less, and particularly preferably 70%. The following is the result. The content of Na2O is more preferably in order to increase the solubility and adjust the average linear expansion coefficient. is 1% or more, more preferably 2% or more, and particularly preferably 3% or more. If O is contained, the weather resistance is deteriorated, so the content is preferably 15% or less, and more preferably 15% or less. Preferably, the content is 12% or less, more preferably, 10% or less, even more preferably, 8% or less, and most preferably, Preferably, it is 7% or less. The content of K2O is preferably 0.5% or more in order to increase the radio wave transmittance. Preferably, it is 1% or more, more preferably, it is 2% or more, even more preferably, it is 3% or more, and particularly The content is preferably 4% or more, and from the viewpoint of improving viscosity, more preferably 15.5% or less, and even more preferably 15.5% or less. Preferably, the ratio is 14% or less, more preferably 12% or less, even more preferably 10% or less, and even more preferably 14% or less. More preferably, it is 8% or less, and most preferably, it is 7% or less.

[0110] The content of Li2O is increased to increase the solubility and Young's modulus, and to improve the radio wave transmittance. The content of Li2O is more preferably 3% or more, and further preferably 4% or more. Because of concerns about phase separation, the content is preferably 15% or less, more preferably 14% or less, and even more preferably Preferably, it is 13% or less, more preferably, it is 12% or less, particularly preferably, it is 10% or less, and even more preferably It is preferably 8% or less, and most preferably 7% or less. The content of SrO is included to improve solubility and to increase radio wave transmittance. If SrO is contained, it is preferable that the content is 0.5% or more, and more preferably 1% or more. The SrO content is preferably 2% or more, and more preferably 2% or more. In order to prevent this, 12% or less is more preferable, 10% or less is even more preferable, and 8% or less is particularly preferable. It is preferably 6% or less, more preferably 4% or less.

[0111] 7Al2O3+3MgO-4Li2O is more preferred to improve the water resistance of glass. Preferably, it is −50 or more, more preferably −40 or more, particularly preferably −35 or more, and even more preferably The optical transmittance is preferably -30 or more, and most preferably -25 or more. In order to reduce the temperature, 7Al2O3+3MgO-4Li2O should preferably be less than -10.5. More preferably, the concentration is -11 or less, even more preferably -12 or less, and particularly preferably -13 or less. Preferably, the pH is lower than -14, more preferably lower than -14, and most preferably lower than -15. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.05 or more. More preferably, it is 0.1 or more, particularly preferably, it is 0.15 or more, and even more preferably, it is 0.2 or more. The most preferable ratio is 0.25 or more. From the viewpoint of improving weather resistance, Na2O / R2O is more preferable. More preferably 0.95 or less, further preferably 0.9 or less, particularly preferably 0.8 or less, More preferably 0.6 or less, even more preferably 0.5 or less, and most preferably 0.4 or less. It is.

[0112] In the sixth aspect, in order to reduce the viscosity during glass melting and molding and to facilitate production, Si O2+Al2O3 is preferably 50% or more, more preferably 55% or more, and particularly preferably It is preferably 60% or more, more preferably 65% ​​or more, and most preferably 68% or more. SiO2+Al2O3 is preferably 80% or less, more preferably 78% or less, and particularly preferably Preferably, it is 76% or less, more preferably, it is 74% or less, and most preferably, it is 72.5% or less. . In order to lower the glass viscosity during melting and molding and make manufacturing easier, Al2O3 is limited to 5% or less. More preferably, the content is 4.5% or less, particularly preferably 4% or less, and even more preferably The lower limit of Al2O3 is preferably 3.5% or less, and most preferably 3% or less. However, in order to ensure weather resistance, the content of Al2O3 is preferably 0.1% or more. More preferably, it is 0.2% or more, more preferably, it is 0.5% or more, and further preferably, it is 1% or more. , particularly preferably 1.5% or more, and even more preferably 2% or more. In order to increase the radio wave transmittance, K2O / R2O is preferably 0.05 or more. Preferably, the ratio is 0.1 or more, more preferably 0.15 or more, even more preferably 0.2 or more, and most preferably 0.5 or more. The K2O / R2O ratio is preferably 0.25 or more from the viewpoint of improving weather resistance. Preferably, it is 0.95 or less, more preferably 0.9 or less, and particularly preferably 0.7 or less. The layer is preferably 0.5 or less, and most preferably 0.4 or less. By setting 2O / R2O within a predetermined range, it is possible to easily increase the radio wave transmittance, which is preferable.

[0113] In the sixth aspect, it is more preferable to lower R2O×MgO in order to increase the radio wave transmittance. R2O×MgO is preferably 200% 2 Less than or equal to 160%, more preferably 2 Below Lower, preferably 120% 2 Less than or equal to 100%, more preferably 2 The following is even more preferred: Or 80% 2 Less than 60%, especially preferred 2 Less than 40%, more preferably 2 Below, the most Preferably 20% 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O + B2O3 is preferably 19% or less, more preferably 18.5% or less. More preferably, it is 18% or less, even more preferably, it is 17% or less, and most preferably, it is 16% or less. However, if the R2O+B2O3 ratio is too low, the glass viscosity during melting and molding will increase. If the amount is too much, it may be difficult to manufacture, so R2O+B2O3 is preferably 2.5% or more. More preferably, the ratio is 5% or more, even more preferably 10% or more, and still more preferably 12% or more. and most preferably 13% or more. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, the B2O3 content is preferably 2% or less. More preferably, the B2O3 content is 1.5% or less. More preferably, it is 1% or less, even more preferably, it is 0.75% or less, and most preferably, it is 0.5% or less. It is.

[0114] In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The MgO+CaO content is preferably 15% or less, more preferably 14% or less, and even more preferably However, if the MgO+CaO ratio is too low, the glass viscosity during melting and molding will decrease. Therefore, the content of MgO + CaO should be less than 1%. More preferably, the ratio is 2% or more, even more preferably 4% or more, and even more preferably 6% or more. % or more, and most preferably 8% or more. Also, to prevent the glass from becoming brittle and losing strength, or to reduce the weight of the glass sheets. In particular, the content of BaO is preferably 15% or less, more preferably 8% or less, and further preferably Preferably, the content is 4% or less, more preferably 2% or less, even more preferably 1% or less, and even more preferably is preferably 0.5% or less, and most preferably substantially not contained.

[0115] Similarly, to prevent glass from becoming brittle and losing strength, or to reduce the weight of glass sheets, In this case, SrO+BaO+ZrO2 is preferably 15% or less, more preferably 14% or less, and even more preferably 15% or less. More preferably 10% or less, even more preferably 8% or less, particularly preferably 5% or less, More preferably, it is 4% or less, and most preferably, it is 2% or less. Furthermore, in order to increase the radio wave transmittance, it is more preferable that the content of MgO is 10.5% or less. Preferably, the ratio is 8% or less, more preferably 6% or less, even more preferably 4% or less, and most preferably From the viewpoint of improving the solubility, it is preferably 0% or more, and more preferably 0.1% or more. It is preferably 0.2% or more, even more preferably 0.3% or more, and particularly preferably 0.5% or more. The top is most preferred. In order to improve solubility and increase radio wave transmittance, the CaO content is set at 0.5% or more. More preferably, the amount of the ion exchange reaction is 1% or more, and even more preferably, 2% or more. It is preferably 3% or more, even more preferably 6% or more, and most preferably 8% or more. From the viewpoint of suppressing devitrification, the content of O is more preferably 18% or less, and further preferably 17% or less. It is particularly preferably 16% or less, more preferably 15% or less, and most preferably 14% or less. .

[0116] ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content is more preferably 0.5% or more. Therefore, it is more preferably 1.8% or less, and further preferably 1.5% or less. From the viewpoint of improving the solubility, the content of R2O is preferably 5% or more, more preferably 6% or more. % or more, more preferably 7% or more, even more preferably 8% or more, and particularly preferably 10% or more. On the other hand, in order to improve weather resistance, it is more preferably At most 18% or less, more preferably at most 16%, even more preferably at most 15%, particularly The content is preferably 14.5% or less. From the viewpoint of improving solubility and radio wave transmittance, RO is preferably 5% or more. , more preferably 7% or more, particularly preferably 10% or more, and most preferably 12% or more. On the other hand, from the viewpoint of improving weather resistance and suppressing devitrification, it is more preferably 19% or less, and even more preferably Preferably, it is 18% or less, even more preferably, it is 17% or less, particularly preferably, it is 16% or less, and most preferably, it is 18% or less. It is also preferably 15% or less.

[0117] The glass plate according to embodiment 7 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 1.44≦Al2O3≦9 0.5≦B2O3≦13 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦1 0.01≦Li2O≦19.1 0≦Na2O≦16 0.9≦K2O≦16 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 0.91≦R2O≦20 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 10<7Al2O3+3MgO-4Li2O≦66 0≦Na2O / R2O≦0.8 0≦PbO<0.001 0≦ZnO≦3 Including. By setting the range of the seventh aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0118] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in the seventh embodiment. In order to increase the Young's modulus and weather resistance, SiO2 is preferably 60% or more, and more preferably 100% or more. More preferably, it is 62% or more, further preferably, it is 64% or more, and particularly preferably, it is 65% or more. From the viewpoint of improving viscosity, it is more preferably 73% or less, further preferably 71% or less, and further preferably 72% or less. More preferably, it is 70% or less, and particularly preferably 68% or less. The content of Na2O is more preferably in order to increase the solubility and adjust the average linear expansion coefficient. is 1% or more, more preferably 1.5% or more, particularly preferably 2% or more, and even more preferably It is preferably 2.5% or more, more preferably 3% or more, and most preferably 4% or more. If a2O is contained, weather resistance deteriorates, so its content is preferably 15% or less. , more preferably 14% or less, particularly preferably 13% or less, and even more preferably 12% or less. , even more preferably 10% or less, and most preferably 8% or less. The content of K2O is preferably 0.5% or more in order to increase the radio wave transmittance. Preferably, it is 1% or more, more preferably, it is 1.5% or more, particularly preferably, it is 2% or more, and even more preferably The content of K2O is preferably 3% or more, and most preferably 4% or more. 5% or less, more preferably 13% or less, particularly preferably 12% or less, and even more preferably 1 It is preferably 0% or less, and most preferably 8% or less.

[0119] The content of Li2O is increased to increase the solubility and Young's modulus, and to improve the radio wave transmittance. Therefore, it is more preferable that the content is 1% or more, further preferably 2% or more, and particularly preferably 3% or more. The content of Li2O is preferably 4% or more. Also, if Li2O is contained, there is a concern that devitrification and phase separation may occur. Therefore, the content is more preferably 15% or less, further preferably 12% or less, and particularly preferably It is preferably 10% or less, more preferably 8% or less, and most preferably 6% or less. SrO may be included to improve solubility and increase radio wave transmittance. When it is contained, its content is preferably 0.5% or more, and more preferably 1% or more. and more preferably 2% or more. The SrO content is to prevent the glass from becoming brittle. Therefore, 12% or less is more preferable, 10% or less is even more preferable, and 8% or less is particularly preferable. It is preferably 6% or less, more preferably 4% or less.

[0120] 7Al2O3+3MgO-4Li2O is more preferable for increasing radio wave transmittance. is 11 or more, more preferably 13 or more, particularly preferably 15 or more, and even more preferably 17 or more, and most preferably 19 or more. In addition, 7Al2O3+3MgO-4Li2O is More preferably, it is 60 or less, even more preferably, it is 50 or less, and particularly preferably, it is 45 or less, and even more preferably It is preferably 40 or less, and most preferably 35 or less. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.05 or more. More preferably, it is 0.1 or more, particularly preferably, it is 0.15 or more, and even more preferably, it is 0.2 or more. More preferably, it is 0.25 or more, and most preferably, it is 0.3 or more. R2O is more preferably 0.85 or less, even more preferably 0.8 or less, and particularly preferably It is preferably 0.6 or less, more preferably 0.5 or less, and most preferably 0.4 or less.

[0121] In the seventh aspect, in order to lower the glass viscosity during melting and molding and to facilitate production, Si O2+Al2O3 is preferably 50 or more, more preferably 55 or more, and particularly preferably It is 60 or more, more preferably 65 or more, and most preferably 67 or more. Al2O3 is preferably 75 or less, more preferably 74 or less, and particularly preferably 73 or less. It is preferably 72 or less, more preferably 71 or less, and most preferably 72 or less. It reduces the glass viscosity during melting and molding, making it easier to manufacture, and also increases the radio wave transmittance. Therefore, the content of Al2O3 is preferably 9% or less. More preferably, the content of Al2O3 is 8%. less than 7%, more preferably less than 6%, and even more preferably less than 5%. In order to ensure weather resistance, the content of Al2O3 is preferably 1.5%. It is preferably at least 2%, more preferably at least 2%, and particularly preferably at least 2.5%. In order to increase the radio wave transmittance, K2O / R2O is preferably 0.05 or more. Preferably, the ratio is 0.1 or more, more preferably 0.15 or more, and even more preferably 0.2 or more. More preferably, K2O / R is 0.25 or more, and most preferably, K2O / R is 0.30 or more. 2O is more preferably 0.95 or less, further preferably 0.8 or less, and particularly preferably 0 0.7 or less, more preferably 0.6 or less, even more preferably 0.5 or less, and most preferably It is less than 0.4.

[0122] In the seventh aspect, it is more preferable to lower R2O×MgO in order to increase the radio wave transmittance. R2O×MgO is preferably 200% 2 Less than or equal to 180%, more preferably 2 below, More preferably, 160% 2 Below 140%, particularly preferably 2 More preferably, 12 0% 2 More preferably, 100% 2 Below 80%, most preferably 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O+B2O3 is preferably 25% or less, more preferably 23% or less, and even more preferably 25% or less. Preferably, the ratio is 20% or less, more preferably 18% or less, and most preferably 16% or less. However, if the R2O+B2O3 ratio is too low, the glass viscosity during melting and molding will increase. Therefore, R2O+B2O3 is preferably 1% or more. , more preferably 2% or more, even more preferably 4% or more, even more preferably 6% or more, and most preferably It is preferably 8% or more. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, the content of B2O3 is preferably 13% or less, more preferably 12% or less, and even more preferably 14% or less. It is preferably 10% or less, more preferably 8% or less, and most preferably 6% or less. In order to improve the solubility, the B2O3 content is preferably 0.5% or more, and more preferably 1% or more. , more preferably 1.5% or more, and particularly preferably 2% or more.

[0123] In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The MgO+CaO content is preferably 15% or less, more preferably 14% or less, and even more preferably 13% or less, more preferably 12% or less, and most preferably 10% or less. However, Mg If the O+CaO ratio is too low, the glass viscosity during melting and molding will be too high, making production difficult. Therefore, MgO + CaO is preferably 1% or more, more preferably 2% or more. More preferably, it is 4% or more, even more preferably, it is 5% or more, and most preferably, it is 6% or more. be. In addition, to prevent the glass from becoming brittle and losing its strength, or to reduce the weight of the glass sheets, BaO is preferably 1% or less, more preferably 0.5% or less, and further preferably 0.1% or less. or less, and it is particularly preferable that the content is substantially zero. As above, to prevent the glass from becoming brittle and losing strength, or to reduce the weight of the glass sheet. For the sake of clarity, the SrO+BaO+ZrO2 content is preferably 10% or less, more preferably 8% or less. More preferably 6% or less, particularly preferably 5% or less, and even more preferably 4% or less, Most preferably, it is 3% or less.

[0124] Furthermore, in order to increase radio wave transmittance, the content of MgO is more preferably 10% or less. More preferably, it is 8% or less, particularly preferably 6% or less, and even more preferably 4.5% or less. More preferably, it is 3% or less, and most preferably, it is 2% or less. In order to improve solubility and increase radio wave transmittance, CaO should be 0.5% or more. The CaO content is more preferably 1% or more, and further preferably 3% or more. , particularly preferably 5% or more, even more preferably 6% or more, and most preferably 7% or more. The CaO content is preferably 18% or less from the viewpoint of suppressing devitrification, and more preferably 15% or less. It is preferable that the ratio is 14% or less, particularly preferable that the ratio is 12% or less, and most preferable that the ratio is 10% or less. I wish.

[0125] ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content is more preferably 0.5% or more. The content of ZrO2 is large and the average linear expansion coefficient is large. Therefore, the content is more preferably 1.8% or less, and even more preferably 1.5% or less. do. From the viewpoint of improving the solubility, the content of R2O is more preferably 5% or more, and more preferably or 6% or more, more preferably 7% or more, particularly preferably 8% or more, while In order to improve weather resistance, it is more preferably 18% or less, and even more preferably 17% or less. Even more preferably, it is 16% or less, particularly preferably, it is 15% or less, and most preferably, it is 14% or less. Below. From the viewpoint of improving solubility and radio wave transmittance, the content of RO is preferably 5% or less. More preferably, the moisture content is 7% or more, and particularly preferably, the moisture content is 10% or more. From the viewpoint of improving the optical properties and suppressing devitrification, the content is more preferably 19% or less, and further preferably 18% or less. , even more preferably 17% or less, particularly preferably 15% or less, and most preferably 13% The following is the result. The glass plate according to this embodiment may contain ZnO since it has the effect of suppressing devitrification. If it is contained in the float bath, defects may occur during manufacturing, so the content of ZnO is The amount of ZnO is preferably 3% or less. The content of ZnO is more preferably 2% or less, and more preferably 1% or less. It is preferably 0.5% or less, more preferably 1% or less, and more preferably substantially free of it.

[0126] The glass plate according to embodiment 8 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 1≦Al2O3≦7.8 0.5≦B2O3≦15 0≦MgO≦11.8 2≦CaO≦20 0≦SrO≦15 0≦BaO≦1 4.25≦Li2O≦19.15 0.25≦Na2O≦15.15 0.60≦K2O≦15.5 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 5.10≦R2O≦20 2≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 -10<7Al2O3+3MgO-4Li2O≦10 0.05≦Na2O / R2O≦0.95 0.11≦K2O / R2O≦0.9 0≦PbO<0.001 Including. By setting the range of the eighth aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0127] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in embodiment 8. The SiO2 content is preferably 60% in order to increase the Young's modulus and weather resistance. More preferably, the viscosity is 63% or more, and particularly preferably, the viscosity is 65% or more. More preferably, the ratio is 73% or less, further preferably 72% or less, and particularly preferably 70%. The following is the result. The content of Na2O is preferably adjusted to increase the solubility and adjust the average linear expansion coefficient. It is preferably 2% or more, more preferably 4% or more, and particularly preferably 5% or more. If Na2O is included, weather resistance will deteriorate, so the content is preferably 15% or less. , more preferably 13% or less, particularly preferably 11% or less, and even more preferably 10% or less. , and most preferably 8% or less. The content of K2O is preferably 1.0% or more in order to increase the radio wave transmittance. It is preferably 2% or more, particularly preferably 4% or more, and even more preferably 5% or more. , K2O is more preferably 15% or less, further preferably 14% or less, and particularly preferably It is preferably 12% or less, more preferably 10% or less, and most preferably 8% or less.

[0128] The content of Li2O is increased to increase the solubility and Young's modulus, and to improve the radio wave transmittance. Therefore, it is more preferable that the content is 4.5% or more, even more preferable that the content is 5.0% or more, and particularly preferable that the content is 5. The content of Li2O is 5% or more, and more preferably 6.0% or more. In addition, the content of Li2O causes devitrification and Due to concerns about phase separation, the content is preferably 15% or less, more preferably 12% or less. % or less, more preferably 10% or less, even more preferably 9% or less, and particularly preferably 8% or less. It is preferably at most 7%, and most preferably at most 6%. 7Al2O3+3MgO-4Li2O is more preferable for increasing radio wave transmittance. is -9 or more, more preferably -6 or more, particularly preferably -4 or more, and even more preferably -2 or more, and most preferably -1 or more. In addition, 7Al2O3+3MgO-4Li2O is More preferably, it is 9 or less, even more preferably, it is 8 or less, particularly preferably, it is 7 or less, and even more preferably is 6 or less, most preferably 5 or less. SrO may be included to improve solubility and to increase radio wave transmittance. When SrO is contained, the content is preferably 0.5% or more, and more preferably The SrO content is 1% or more, and particularly preferably 2% or more. The SrO content is such that the glass becomes brittle. In order to prevent this, 12% or less is more preferable, 10% or less is even more preferable, and 8% or less is particularly preferable. It is preferable that the content is 6% or less, more preferable that the content is 6% or less, and most preferable that the content is 4% or less. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.1 or more. Preferably, the ratio is 0.15 or more, more preferably 0.2 or more, and even more preferably 0.25 or more. The Na2O / R2O ratio is most preferably 0.3 or more. The Na2O / R2O ratio is more preferably 0.9 or more. More preferably, it is 0.8 or less, particularly preferably 0.7 or less, and even more preferably 0.6 or less. It is preferably 0.5 or less, and more preferably 0.4 or less.

[0129] In the eighth embodiment, SiO2+Al2O3 is more preferably 50% or more, and even more preferably Preferably, the content is 55% or more, more preferably 60% or more, even more preferably 65% ​​or more, and most preferably The ratio of SiO2+Al2O3 is preferably 80% or less, and more preferably 68% or less. Preferably, it is 78% or less, more preferably, it is 75% or less, and even more preferably, it is 74% or less. Preferably, the thickness is 73% or less, and most preferably, the thickness is 72% or less. In order to make manufacturing easier by lowering the glass viscosity during melting and molding, and to increase the radio wave transmittance, In order to reduce the amount of Al2O3, the content of Al2O3 is preferably 7% or less. Preferably, it is 6% or less, particularly preferably 5% or less, and most preferably 4% or less. In order to ensure weather resistance, O3 is preferably 1.5% or more, and even more preferably 2% or more. It is particularly preferably 2.5% or more. In order to increase the radio wave transmittance, K2O / R2O is preferably 0.15 or more. Preferably, the ratio is 0.2 or more, more preferably 0.25 or more, and even more preferably 0.28 or more. The K2O / R2O ratio is most preferably 0.3 or more. The K2O / R2O ratio is more preferably 0.85 or more. More preferably, it is 0.8 or less, particularly preferably 0.7 or less, and even more preferably 0.5 or less. The ratio of Na2O / R2O and K2O / R2O is preferably 0.4 or less. By setting the range, it is possible to easily increase the radio wave transmittance, which is preferable.

[0130] In the eighth aspect, the ratio of R2O×MgO is preferably low in order to increase the radio wave transmittance. R2O×MgO is preferably 200% 2 Less than or equal to 150% 2 below , and more preferably 100% 2 Less than 60%, especially preferred 2 More preferably, 50 or less % 2Less than 40%, more preferably 2 Below 30%, most preferably 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O+B2O3 is preferably 25% or less, more preferably 22% or less, and even more preferably 25% or less. Preferably, the ratio is 20% or less, more preferably 19% or less, and most preferably 18% or less. However, if the R2O+B2O3 ratio is too low, the glass viscosity during melting and molding will increase. Therefore, R2O+B2O3 is preferably 1% or more. , more preferably 2% or more, even more preferably 4% or more, even more preferably 6% or more, and most preferably It is preferably 10% or more. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, the B2O3 content is more preferably 12% or less, even more preferably 8% or less, and even more preferably The content is preferably 6% or less, and most preferably 5% or less. The content of B2O3 is preferably 0.5% or more, more preferably 1% or more, and even more preferably Most of the time it is more than 2%. In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The MgO+CaO content is preferably 15% or less, more preferably 14% or less, and even more preferably 13% or less, more preferably 12% or less, and most preferably 10% or less. However, Mg If the O+CaO ratio is too low, the glass viscosity during melting and molding will be too high, making production difficult. Therefore, the MgO+CaO content is preferably 1% or more, and more preferably 1% or more. 2% or more, more preferably 3% or more, even more preferably 4% or more, and most preferably 5% or more. Above.

[0131] Also, to prevent the glass from becoming brittle and losing strength, or to reduce the weight of the glass sheets. The content of BaO is preferably 1% or less, more preferably 0.5% or less, and further preferably is preferably 0.1% or less, and more preferably substantially not contained. As mentioned above, to prevent glass from becoming brittle and losing strength, or to reduce the weight of glass sheets. Therefore, SrO+BaO+ZrO2 is preferably 12% or less, and more preferably 8% or less. less than 5%, particularly preferably less than 4%, and most preferably less than 3%. be. Furthermore, in order to increase the radio wave transmittance, the content of MgO is preferably 11.8% or less. More preferably, the ratio is 10% or less, further preferably 8% or less, and particularly preferably 6% or less. The thickness is preferably 4% or less, and most preferably 2% or less. In order to improve the solubility and to increase the radio wave transmittance, the CaO content is set to 2% or more. It is preferable that the ratio is 3% or more, more preferably 4% or more, and particularly preferably 5% or more. The CaO content is preferably 5% or more, and more preferably 6% or more. It is more preferably 18% or less, further preferably 16% or less, and particularly preferably 14% or less. Preferably, 12% or less is more preferable, 10% or less is even more preferable, and 9% or less is even more preferable. It is preferable that the content is 8% or less, and most preferable that the content is 8% or less. The content of ZrO2 may be included to improve chemical durability. When ZrO2 is included, The content is more preferably 0.5% or more. Therefore, the content is more preferably 1.8% or less, and further preferably 1.5% or less. Below. From the viewpoint of improving the solubility, the content of R2O is more preferably 6% or more, and even more preferably It is preferably 7% or more, and particularly preferably 8% or more. On the other hand, in order to improve weather resistance, , more preferably 18% or less, even more preferably 16% or less, and even more preferably 15% or less. % or less, more preferably 14.5% or less, and particularly preferably 13.5% or less. From the viewpoint of improving solubility and radio wave transmittance, the RO content is preferably 4% or more. More preferably, it is 6% or more, and particularly preferably 7% or more. From the viewpoint of improving the optical properties and suppressing devitrification, it is more preferably 19% or less, and further preferably 18% or less. Even more preferably, it is 17% or less, even more preferably, it is 16% or less, and particularly preferably, it is 1 It is preferably 4% or less, and most preferably 12% or less.

[0132] The glass plate according to embodiment 9 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0.5≦Al2O3≦15 0≦B2O3≦15 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦15 3.4 <Li2O≦20 0≦Na2O≦16.6 0≦K2O≦16.6 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 3.4 <R2O≦20 1≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 -60≦7Al2O3+3MgO-4Li2O≦-10 0≦PbO<0.001 Including. By setting the range of the ninth aspect, high radio wave transmittance is exhibited and the characteristics required for the desired application are obtained. A glass plate satisfying the above requirements is obtained.

[0133] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in the ninth embodiment. The SiO2 content is preferably 60% in order to increase the Young's modulus and weather resistance. More preferably, the viscosity is 63% or more, and particularly preferably, the viscosity is 65% or more. More preferably, the ratio is 74% or less, further preferably 72% or less, and particularly preferably 70%. The following is the result. The content of Na2O is preferably adjusted to increase the solubility and adjust the average linear expansion coefficient. It is preferably 1% or more, more preferably 2% or more, and particularly preferably 3% or more. If Na2O is included, weather resistance will deteriorate, so the content is preferably 15% or less. , more preferably 13% or less, particularly preferably 11% or less, and even more preferably 9% or less, Most preferably, it is 7% or less. The content of K2O is preferably 0.5% or more in order to increase the radio wave transmittance. Preferably, the content is 1% or more, more preferably 2% or more, even more preferably 3% or more, and most preferably The content of K2O is preferably 4% or more. The content of K2O is more preferably 15% or less, and further preferably 15% or less. or 13% or less, particularly preferably 11% or less, even more preferably 9% or less, and most preferably is less than 7%.

[0134] The content of Li2O is increased to increase the solubility and Young's modulus, and to improve the radio wave transmittance. Therefore, it is more preferable that the content is 3.5% or more, even more preferable that the content is 4% or more, and particularly preferable that the content is 4.5% or more. The content of Li2O is preferably 5% or more, and more preferably 5% or more. Therefore, the content is more preferably 18% or less, and even more preferably 16% or less. More preferably, the ratio is 14% or less, even more preferably, 13% or less, and even more preferably, 12% or less. Preferably, the difference is 10% or less. SrO may be included to improve solubility and increase radio wave transmittance. When it is contained, its content is preferably 0.5% or more, and more preferably 1% or more. The SrO content is preferably 2% or more to prevent the glass from becoming brittle. Therefore, 12% or less is more preferable, 10% or less is even more preferable, and 8% or less is particularly preferable. , 6% or less is more preferable, and 4% or less is most preferable. 7Al2O3+3MgO-4Li2O is more preferred to improve the water resistance of glass. Preferably, it is −50 or more, more preferably −40 or more, particularly preferably −35 or more, and even more preferably The optical transmittance is preferably -30 or more, and most preferably -25 or more. To achieve this, 7Al2O3+3MgO-4Li2O is preferably -11 or less. More preferably -12 or less, particularly preferably -13 or less, and even more preferably -14 or less. Most preferably, it is −15 or less. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.05 or more. More preferably, it is 0.1 or more, particularly preferably, it is 0.15 or more, and even more preferably, it is 0.2 or more. The Na2O / R2O ratio is most preferably 0.25 or more. 5 or less, more preferably 0.9 or less, particularly preferably 0.8 or less, and even more preferably 0. 7 or less, even more preferably 0.6 or less, and most preferably 0.5 or less.

[0135] In the ninth aspect, in order to reduce the viscosity during glass melting and molding and to facilitate production, Si O2+Al2O3 is preferably 50% or more, more preferably 55% or more, and particularly preferably It is preferably 60% or more, more preferably 65% ​​or more, and most preferably 68% or more. SiO2+Al2O3 is preferably 80% or less, more preferably 78% or less, and particularly preferably It is preferably 76% or less, more preferably 74% or less, and most preferably 72% or less. In order to lower the glass viscosity during melting and molding and make it easier to manufacture, the content of Al2O3 is More preferably, Al2O3 is 13% or less. Further preferably, Al2O3 is 11% or less. Preferably, the content is 9% or less, more preferably 7% or less, and most preferably 5% or less. In order to ensure weather resistance, it is more preferably 1% or more, and even more preferably 1.5% or more. Particularly preferably, the concentration is 2% or more, particularly preferably, 2.5% or more, and most preferably, 3% or more. Above. In order to increase the radio wave transmittance, K2O / R2O is preferably 0.05 or more. Preferably, the ratio is 0.1 or more, more preferably 0.15 or more, even more preferably 0.2 or more, and most preferably 0.5 or more. The K2O / R2O ratio is preferably 0.25 or more. More preferably, it is 0.9 or less, particularly preferably 0.7 or less, and even more preferably 0.5 or less. The ratio of Na2O / R2O and K2O / R2O is preferably 0.4 or less. By setting the range, it is possible to easily increase the radio wave transmittance, which is preferable.

[0136] In the ninth aspect, it is more preferable to lower R2O×MgO in order to increase the radio wave transmittance. R2O×MgO is preferably 200% 2 Less than or equal to 100%, more preferably 2 Less than 70%, particularly preferably 2 Less than 50%, more preferably 2 Below 30, most preferably % 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, the content of R2O+B2O3 is preferably 25% or less, more preferably 24% or less, and even more preferably 25% or less. Preferably, it is 23% or less, more preferably, it is 21% or less, even more preferably, it is 19% or less, and most preferably, it is 23% or less. The preferable ratio is 18% or less. However, if the ratio of R2O+B2O3 is too low, it may be difficult to melt and mold the product. The glass viscosity at the time of manufacture may become too high, making manufacturing difficult. 2O3 is preferably 1% or more, more preferably 2% or more, and further preferably 4% or more. The thickness is preferably 6% or more, and most preferably 8% or more. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, the content of B2O3 is preferably 15% or less, more preferably 12% or less, and even more preferably 15% or less. It is preferably 10% or less, more preferably 8% or less, and most preferably 6% or less. In addition, it may be contained to improve solubility, and when it is contained, the content of B2O3 is preferably 0.5% or more. It is preferably 1% or more, more preferably 2% or more. In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, In the case where MgO and CaO are contained, the MgO+CaO content is preferably 15% or less, and more preferably 15% or less. 14% or less, more preferably 13% or less, even more preferably 12% or less, and most preferably However, if the MgO+CaO ratio is too low, the glass viscosity during melting and molding will decrease. Therefore, the content of MgO + CaO should be less than 1%. More preferably, the ratio is 2% or more, even more preferably 3% or more, and still more preferably 4% or more. % or more, and most preferably 5% or more. Also, to prevent the glass from becoming brittle and losing strength, or to reduce the weight of the glass sheets. In the present invention, BaO is preferably 15% or less, more preferably 10% or less, and further preferably 8% or less. Less than or equal to 5%, particularly preferably less than or equal to 3%, and even more preferably less than or equal to 1%. and most preferably substantially free of it. Similarly, to prevent glass from becoming brittle and losing strength, or to reduce the weight of glass sheets, The content of SrO+BaO+ZrO2 is preferably 12% or less, and more preferably 8% or less. , particularly preferably 6% or less, even more preferably 4% or less, and most preferably 2% or less. . Furthermore, in order to increase the radio wave transmittance, it is more preferable that the MgO content is 12% or less. More preferably, it is 8% or less, particularly preferably 5% or less, even more preferably 3% or less, and most preferably Preferably, it is 2% or less. In order to improve solubility and increase radio wave transmittance, the CaO content is set at 0.5% or more. More preferably, the amount of the ion exchange reaction is 1% or more, and even more preferably, 2% or more. The CaO content is preferably 3% or more, and most preferably 4% or more. More preferably, the ratio is 15% or less, even more preferably 13% or less, and particularly preferably 11% or less. , 9% or less is more preferable, and 8% or less is most preferable. ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content is more preferably 0.5% or more. Therefore, the content is more preferably 1.8% or less, and further preferably 1.5% or less. . From the viewpoint of improving the solubility, the content of R2O is more preferably 5% or more, and more preferably or 6% or more, more preferably 7% or more, further preferably 8% or more, particularly preferably On the other hand, in order to improve weather resistance, the content of is preferably 18% or more. % or less, more preferably 17% or less, even more preferably 15% or less, and particularly preferably is less than 14.5%. From the viewpoint of improving solubility and radio wave transmittance, the content of RO is preferably 5% or less. More preferably, it is 7% or more, particularly preferably 10% or more, and most preferably 12% or more. % or more, while from the viewpoint of improving weather resistance and suppressing devitrification, it is more preferable that the content is 19% or less. More preferably, it is 18% or less, even more preferably, it is 17% or less, and particularly preferably, it is 16% or less. The most preferable range is 15% or less.

[0137] The glass plate according to embodiment 10 of the present invention preferably satisfies the following conditions. The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3<1.3 0≦B2O3≦15 0≦MgO≦4.5 0≦CaO≦20 0≦SrO≦4 0≦BaO≦15 0≦Li2O<0.01 0≦Na2O≦14.4 1≦K2O≦16 0≦ZrO2≦2 0.001≦Fe2O3≦1.5 0.001≦TiO2≦5 1.1≦R2O≦18 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 0≦7Al2O3+3MgO≦22.6 0.05≦Na2O / R2O≦0.80 0≦PbO<0.001 0≦ZnO≦0.5 Including. By setting the range of the embodiment 10, high radio wave transmittance is exhibited and mass production by the float method is possible. It is easy to produce, and a glass sheet satisfying the properties required for the desired application can be obtained.

[0138] In order to increase the radio wave transmittance, it is more preferable to set the range as follows in the tenth embodiment: . The SiO2 content is preferably 60% in order to increase the Young's modulus and weather resistance. More preferably, it is 65% or more, even more preferably, it is 68% or more, and particularly preferably From the viewpoint of improving viscosity, the SiO2 content is preferably 74% or more. The ratio is preferably 73.5% or less, more preferably 73% or less, and particularly preferably 73% or less. In order to increase the radio wave transmittance, the content of Al2O3 is preferably less than 1.3%. More preferably, it is 1.2% or less, further preferably, it is 1.0% or less, and particularly preferably, it is 0.8% or less. In order to increase the Young's modulus and weather resistance, it is more preferable that the content is 0.1% or more, and even more preferable that the content is 0.1% or more. Preferably, the content is 0.2% or more, more preferably 0.3% or more, and most preferably 0.5% or more. It is.

[0139] From the viewpoint of improving solubility and weather resistance, the content of MgO is preferably 0.1% or more. , more preferably 0.25% or more, even more preferably 0.3% or more, and even more preferably The content of MgO is preferably 0.4% or more, and particularly preferably 0.5% or more. In order to improve the transparency, 4.5% or less is more preferable, 4.0% or less is more preferable, and 3.5% or less is more preferable. % or less, more preferably 3% or less, and even more preferably 2.5% or less. More preferably, it is 2% or less, particularly preferably 1.5% or less, and most preferably 1% or less. do. The CaO content is preferably 1% or more in order to improve the solubility and increase the radio wave transmittance. More preferably, the content is 2% or more, still more preferably 4% or more, and particularly preferably 5% or more. The CaO content is more preferably 6% or more, and most preferably 8% or more. From this viewpoint, 18% or less is more preferable, 16% or less is even more preferable, and 15% or less is particularly preferable. Preferably, the content is 14% or less, more preferably, 13% or less.

[0140] BaO may be contained to improve solubility and increase radio wave transmittance. When contained, the content is preferably 0.5% or more, and more preferably 1% or more. and more preferably 2% or more. The content of BaO is to prevent the glass from becoming brittle. Therefore, 12% or less is more preferable, 10% or less is further preferable, and 7% or less is particularly preferable. It is preferable that the content is 5% or less, and more preferable that the content is 3% or less. The content of Na2O is more preferably in order to increase the solubility and adjust the average linear expansion coefficient. is 0.1% or more, more preferably 1% or more, particularly preferably 3% or more, and even more preferably 5% or more, more preferably 6% or more, and most preferably 7% or more. If O is contained, the weather resistance is deteriorated, so the content is preferably 13% or less, and more preferably 14% or less. Preferably, the content is 11% or less, more preferably, 10% or less, even more preferably, 9% or less, and most preferably, Preferably, it is 8% or less. In order to increase the radio wave transmittance, the content of K2O is preferably 3% or more, and more preferably 5% or more. Preferably, it is 4% or more, particularly preferably 5% or more, even more preferably 6% or more, and most preferably 7% or more. To prevent the viscosity at high temperatures from becoming too high, it is more preferable that the content be 13% or less. More preferably, it is 11% or less, particularly preferably, it is 10% or less, and even more preferably, it is 9% or less. The difference is preferably 8% or less.

[0141] ZrO2 may be contained to improve chemical durability. When ZrO2 is contained, the content The content of ZrO2 is preferably 0.5% or more. Therefore, it is more preferably 1.8% or less, and even more preferably 1.5% or less. It is. From the viewpoint of improving the solubility, the content of R2O is preferably 4% or more, more preferably 5% or more. % or more, more preferably 6% or more, even more preferably 7% or more, and particularly preferably On the other hand, in order to improve weather resistance, it is more preferably 17% or less. More preferably, it is 15% or less, even more preferably, it is 14% or less, and particularly preferably, it is 13% or less. less than 12%, particularly preferably less than 11%, and most preferably It is less than 10%. From the viewpoint of improving solubility and radio wave transmittance, RO is preferably 4% or more, and more preferably 4% or more. Preferably, it is 5% or more, more preferably, it is 7% or more, particularly preferably, it is 10% or more, and particularly preferably, it is 10% or more. Particularly preferably, the content is 12% or more, and most preferably, 12.5% ​​or more. From the viewpoint of suppressing devitrification, it is more preferably 19% or less, even more preferably 18% or less, and even more preferably 19% or less. More preferably, it is 17% or less, particularly preferably 16% or less, and most preferably 15% or less. be.

[0142] 7Al2O3+3MgO improves weather resistance and increases Young's modulus, increasing the rigidity of the glass plate. Therefore, it is more preferably 0.5% or more, further preferably 1% or more, and particularly preferably 2%. More preferably, the radio wave transmittance is 3% or more, and most preferably, 5% or more. In order to reduce the amount of 7Al2O3+3MgO, it is more preferable that the amount of 7Al2O3+3MgO is 22% or less, and even more preferable that the amount of 7Al2O3+3MgO is 22% or less. is 20% or less, particularly preferably 18% or less, even more preferably 15% or less, and most preferably It is less than 10%. In order to increase the radio wave transmittance, Na2O / R2O is preferably 0.1 or more. Preferably, it is 0.2 or more, more preferably, it is 0.25 or more, even more preferably, it is 0.3 or more, and particularly preferably, it is 0.2 or more. Preferably, the ratio is 0.35 or more, more preferably 0.4 or more, and most preferably 0.45 or more. Moreover, Na2O / R2O is more preferably 0.75 or less, and even more preferably 0. 7 or less, particularly preferably 0.65 or less, even more preferably 0.6 or less, and most preferably 0. 55 or less. SiO2+Al2O3 is more preferably 50% or more, and even more preferably 55% or more. Particularly preferably, the content is 60% or more, even more preferably, 65% or more, and most preferably, 68% or more. Moreover, SiO2+Al2O3 is more preferably 80% or less, and further preferably 78% or less. % or less, particularly preferably 76% or less, even more preferably 74.5% or less, and even more preferably is 74% or less, and most preferably 73% or less.

[0143] It is preferable to lower the R2O×MgO ratio in order to increase the radio wave transmittance. MgO is preferably 80% 2 Less than or equal to 75% 2 Less than 70, more preferably % 2 Less than 50%, especially preferred2 Less than 30%, more preferably 2 The following is most preferably 20% 2 The following is the result. Prevents boron and alkali elements from volatilizing during melting and molding, which can lead to deterioration of glass quality. In order to prevent this, R2O+B2O3 is preferably 19% or less, more preferably 18% or less, and even more preferably 19% or less. Preferably, the ratio is 17% or less, more preferably 16% or less, and most preferably 15% or less. However, if the R2O+B2O3 ratio is too low, the glass viscosity during melting and molding will increase. Therefore, R2O+B2O3 is preferably 2% or more. , more preferably 4% or more, more preferably 6% or more, and even more preferably 8% or more, It is preferably 10% or more, and most preferably 12% or more. In the tenth embodiment, the Na2O component in the glass increases relatively to the total alkali content. Therefore, especially in the float process, boron and alkali elements are vaporized during melting and molding. In order to prevent deterioration of glass quality, the content of B2O3 is preferably 15% or less. More preferably, the ratio is 10% or less, even more preferably 7% or less, and even more preferably 5% or less. More preferably, it is 3% or less, particularly preferably, it is 2% or less, and particularly preferably, it is 1% or less. Most preferably, the compound is substantially free of the above-mentioned amines. The glass plate according to the tenth embodiment has a composition ratio of SiO2+Al2O3+MgO+CaO+SrO+ BaO+Li2O+Na2O+K2O+Fe2O3+TiO2≦100 This makes it possible to produce glass sheets using readily available glass raw materials. In addition, in the case of the glass of this embodiment, which has a composition with a small amount of Al2O3 and MgO, the durability of the glass plate is In order to ensure weather resistance, the total amount is preferably 98.5% or more. The glass plate for a window material typically has a porosity of 99% or more, and particularly preferably 99.5% or more. Since colorants, clarifiers, etc. are added to the above, the upper limit of the total amount is more preferably 99.9%. . In addition, in the tenth embodiment, the amount of Al2O3 and MgO is small, so the glass becomes brittle and the strength is reduced. In order to prevent the glass from falling off or to reduce the weight of the glass plate, the SrO content is preferably 4% or less. More preferably, it is 2.5% or less, further preferably, it is 1% or less, and particularly preferably, it is substantially is not contained in

[0144] In order to prevent devitrification during glass melting and molding, which leads to deterioration of glass quality, The MgO+CaO content is preferably 18% or less, more preferably 16% or less, and even more preferably 1 4% or less, more preferably 13% or less, even more preferably 12% or less, and most preferably 1 However, if the MgO+CaO ratio is too low, the glass viscosity during melting and molding will decrease. If the content becomes too high, it may become difficult to manufacture, so MgO + CaO is preferably 1% or more. More preferably, the content is 3% or more, even more preferably 4% or more, and even more preferably 6% or more. Most preferably, it is 9% or more. The glass plate according to the embodiment 10 is particularly prone to devitrification, so the content of TiO2 is 1. Preferably, it is 0.5% or less, more preferably 1% or less, even more preferably 0.5% or less, and especially Preferably 0.2% or less, more preferably 0.1% or less, most preferably 0.05% or less It is. In order to enable production of the glass plate according to the tenth aspect by the float method, the content of ZnO is 0.5% or less is preferable. If ZnO is contained, it will form Zn-based compounds in the float bath. However, this is not preferred as it makes the glass more susceptible to defects. The ZnO content is more preferably 0. It is preferably contained in an amount of 1% or less, and more preferably not contained at all. The glass plate according to the present embodiment has an Fe2O3 content of 0.001% to 1.5%. It is preferable to set the Fe2O3 content to less than 0.001%. In addition, glass sheets are manufactured using materials with low iron content. This requires the use of expensive raw materials, and when melting glass, heat is generated on the bottom of the melting furnace more than necessary. This is not desirable because radiation may reach the melting furnace and cause a load. The content of 3 is more preferably 0.005% or more, even more preferably 0.01% or more, particularly Preferably, it is 0.015% or more, more preferably, it is 0.02% or more, and most preferably, it is 0.05% or more. % or more. If Fe2O3 exceeds 1.5%, heat transfer by radiation is hindered and the raw material becomes difficult to melt. Furthermore, if the Fe2O3 content is too high, the light transmittance in the visible range may decrease. This may result in a decrease in the Tv, making the device unsuitable for use in automotive applications. The content of e2O3 is more preferably 1.5% or less, even more preferably 1% or less, and even more preferably Preferably, it is 0.8% or less, even more preferably, it is 0.6% or less, and particularly preferably, it is 0.5% or less. It is preferably 0.4% or less, more preferably 0.3% or less.

[0145] In any of the above-mentioned embodiments, the glass plate according to the present invention has a NiO content of 100% by mass. The glass plate according to the present invention preferably has a glass content of S iO2, Al2O3, B2O3, MgO, CaO, SrO, BaO, Li2O, Na2O , K2O, TiO2, ZrO2, Fe2O3, and components other than NiO (hereinafter referred to as "others" The total content of the other components is preferably 5% or less. For example, Y2O3, Nd2O5, P2O5, GaO2, GeO2, CeO2, MnO2, Co O, Cr2O3, V2O5, Se, Au2O3, Ag2O, ZnO, CuO, CdO, S O3, Cl, F, SnO2, Sb2O3, etc., which may be metal ions, The glass plate according to the present invention has a NiO content of 100 ppm by mass or more. or less (including 0 ppm by mass), and the total content of other components is 5% or less. is more preferred. If NiO is included, NiS may be generated, which may cause glass breakage. The content is preferably 100 ppm by mass or less, and more preferably 10 ppm by mass or less. It is more preferable that the other components are substantially free of NiO. For the purpose of clarifying and coloring, up to 5% may be contained. If the content of other ingredients exceeds 5%, The content of other components is preferably 3.0 to 5.0% by weight. % or less, more preferably 2% or less, more preferably 1.5% or less, and even more preferably is 1% or less, particularly preferably 0.5% or less, even more preferably 0.3% or less, and most preferably In order to prevent adverse effects on the environment and human body, As2O3, PbO The content of each of is more preferably less than 0.001%, and is substantially not contained. It is most preferable. SO3 can be used as a fining agent and contribute to defoaming. By using salts of sulfur oxide as raw materials, it is possible to include them in glass. The amount is preferably 0.01% or more, more preferably 0.02% or more, more preferably 0.0 It is preferably 4% or more, more preferably 0.08% or more, and most preferably 0.1% or more. If the content is too high, the above-mentioned amber coloring may occur, so the content is preferably 1% or less, and more preferably 1% or less. or 0.8% or less, even more preferably 0.6% or less, and most preferably 0.5% or less. It is. Sb2O3 acts as a clarifier similar to SO3, but prevents harmful effects on the environment and human health. Therefore, it is more preferably 0.5% or less, even more preferably 0.2% or less, and even more preferably Preferably 0.1% or less, more preferably 0.05% or less, and even more preferably 0.01% or less. It is most preferable that the following elements are substantially not contained. CeO2 acts as an oxidizing agent and can control the amount of FeO. It can also block ultraviolet rays. Therefore, it is possible to prevent deterioration of interior materials caused by ultraviolet rays. The content of CeO2 in the case of Preferably, it is 0.004% or more, more preferably, it is 0.01% or more, and further preferably, it is 0.0 It is preferably 5% or more, and more preferably 0.1% or more. It is preferably 1% or less, more preferably 0.5% or less, and particularly preferably 0.3% or less. Cr2O3 acts as an oxidizing agent and can control the amount of FeO. The content of Cr is preferably 0.002% or more, and more preferably 0.004% or more. Since 2O3 has color in the visible range, there is a risk of reducing the transmittance in the visible range. More preferably, it is 0.5% or less, particularly preferably 0.3% or less, and most preferably 0.1% or less. % or less. SnO2 acts as a reducing agent and can control the amount of FeO. The content is preferably 0.01% or more, more preferably 0.04% or more, and even more preferably 0. It is preferable that the content of the Cr content is 0.06% or more, and particularly preferably 0.08% or more. In order to control this, it is preferably 1% or less, more preferably 0.5% or less, and particularly preferably 0. It is preferably 3% or less, and most preferably 0.2% or less. In addition, P2O5 is used to remove defects in glass during production using the float process. Since it is easily generated, the content is preferably 1% or less, and more preferably 0.5% or less. , particularly preferably 0.1% or less, and even more preferably less than 0.001%.

[0146] The glass plate according to the present invention has a dielectric loss tan δ of 0.001 or more at a frequency of 35 GHz. It is preferable that the dielectric loss tan δ of the glass material is reduced. This is particularly preferable because it can increase the wave transmittance. Preferably, it is 0.017 or less, more preferably, it is 0.015 or less, and particularly preferably, it is 0.013 or less. It is more preferably 0.010 or less, and most preferably 0.008 or less. From the viewpoint of efficiency, there is no lower limit to the desirable dielectric loss, but if tan δ becomes too low, SiO The two components tend to be too abundant, which can reduce the solubility of the glass. Preferably, it is 0.0015 or more, more preferably, 0.003 or more, and even more preferably, 0.00 4 or more, particularly preferably 0.005 or more, even more preferably 0.007 or more, and most preferably is greater than or equal to 0.0075.

[0147] The glass plate according to the present invention preferably has a thickness of 1 mm or more and 36 mm or less. If the thickness is less than 1 mm, it will be difficult to obtain sufficient rigidity, and the material may not be suitable for practical use. The thickness of the glass plate is more preferably 1.2 mm or more, and even more preferably 1.8 mm or more. mm or more, particularly preferably 2.4 mm or more, even more preferably 2.8 mm or more, and most preferably The thickness is usually 3.7 mm or more. If the thickness is more than 36 mm, the radio wave transmittance is high. The advantages of the material may not be fully utilized in practice. The thickness is preferably 24 mm. It is preferably 12 mm or less, more preferably 10 mm or less, and even more preferably 12 mm or less. It is preferably 8 mm or less, and most preferably 7 mm or less.

[0148] This thickness may be the total thickness of the stacked glass. The glass plate of the present invention may be made of other glass plates. may be used in conjunction with other glass sheets, i.e. stacked or adjacent to other glass sheets. The glass plate of the specific composition described above can be laminated with a glass plate of a different composition. In other words, only a part of the layers of the laminated glass can ensure the radio wave transmittance specified in this specification. The glass plate of the present invention may be laminated with a transparent resin other than glass. It may be used in layers.

[0149] In another aspect of the present specification, there is provided a window comprising a glass pane according to the above embodiment.

[0150] In this specification, the term "window" refers to a window that is used to connect the interior and exterior of a vehicle or building, or between one room and an adjacent room. Glass panes used to separate and provide visibility are surrounded by non-glass material "Vehicles" includes automobiles, trains, carriages, ships, airplanes, helicopters, and cable cars. Any vehicle or transportation that has a room surrounded by walls (which may include windows), such as a Ferris wheel, Similarly, "building" may include houses, office buildings, shops, warehouses, factories, booths, etc. This includes any building that has a room surrounded by walls (which may contain windows), such as a window. Non-glass materials surrounding the lath include, for example, metal, wood, concrete, stone, and ceramics. , brick, plastic, carbon fiber, or any mixture of these. The non-glass material surrounding the glass panes is typically used in the body of an automobile. or door frames, or the material of walls, ceilings, floors, or doors in buildings The window may be an entire door, wall, ceiling, or floor. It is possible.

[0151] The glass sheets provided in the window according to the present invention are typically 10,000 mm 2 The above A window may have a large area, but may be made up of multiple panes of glass with smaller areas arranged side by side. The window according to the invention comprises a glass pane according to the invention laminated with another glass pane or transparent material. The mounting member may be inserted in the recess.

[0152] In one embodiment, the window is an automotive window, i.e., the window is a windshield for an automobile. Glass, rear window, front door glass, rear door glass, side glass, roof glass The thickness of the glass plate provided in the window for the automobile is preferably 1.2 mm or more. , more preferably 2 mm or more, even more preferably 2.8 mm or more, and even more preferably 3.2 The thickness of the glass plate in the window of an automobile is preferably 3.7 mm or more. Visible light transmittance Tv_A (JIS R 3106:1998) is the value for the windshield or front For front door glass, the equivalent thickness of 3.85 mm is preferably 72% or more. For glass other than glass or front door glass, Tv_A is usually 30-92%, depending on the application. It is.

[0153] In one embodiment, the window for the vehicle is adapted to illuminate and / or receive light from the outside of the vehicle. An information acquisition device for acquiring information from the light can be disposed in a space opposite the information acquisition device through which light passes. The glass plate has at least one information acquisition area, and includes an outer glass plate, an inner glass plate, and the glass plates. It has an intermediate film placed between the plates. It is especially used for windshields. The windows for automobiles may be made of laminated glass or tempered glass. The tempered glass may be physically tempered glass or chemically tempered glass. . The wavelength of light irradiated and / or received on the window of an automobile is in the range of 700 to 1650 nm. In this case, it is preferable to use a commercially available laser radar or infrared camera. Furthermore, the transmittance of the information acquisition area in the wavelength range of 700 to 1650 nm is 80 to 92%. This is preferable because it makes it easier for the information acquisition device to detect light. 3% or more, more preferably 86% or more, particularly preferably 88% or more, and even more preferably 8 9% or more, and most preferably 90% or more. If the transmittance is too high, the heat shielding property may be deteriorated. It is preferably 91.5% or less, and more preferably 91% or less.

[0154] In one embodiment, the window of the vehicle is adapted to emit and / or receive radio waves to detect the outside of the vehicle. It is possible to place an information acquisition device that acquires information from the The glass plate has at least one information acquisition area for acquiring information on an outer glass plate, an inner glass plate, and the glass plate. It has an intermediate film placed between the glass sheets. It is especially used for windshields. It is preferable to be able to do so. The frequency of radio waves irradiated and / or received on car windows is in the range of 2 to 100 GHz. This is preferable because it is possible to use a commercially available radar device. 0 GHz or more, more preferably 50 GHz or more, and particularly preferably 60 GHz or more. Furthermore, at least one of the outer glass and the inner glass used in the information acquisition area The radio wave transmittance of the sheet at a frequency of 100 GHz converted to an 18 mm thickness is 20 to 84%. If the radio wave transmittance is higher than 100%, the information acquisition device can easily detect radio waves, which is preferable. Preferably 22% or more, more preferably 25% or more, and even more preferably 29% or more , particularly preferably 33% or more, even more preferably 37% or more, and most preferably 40% or more. In addition, if the radio wave transmittance is too high, it becomes difficult to manufacture the glass. 0% or less, more preferably 70% or less, more preferably 60% or less, and even more preferably 5 5% or less, even more preferably 50% or less, particularly preferably 45% or less, even more preferably is 43% or less, and most preferably 41% or less.

[0155] In one embodiment, both light irradiation and / or light reception and radio wave irradiation and / or radio wave reception are performed. It is more preferable that it is possible to

[0156] In one embodiment, the window is a building window, i.e., the window is adapted to be installed in the walls, doors, ceilings, etc. of a building. The thickness of the glass panes in the windows for building materials is preferably 2 mm or more, more preferably 4 mm or more, even more preferably 6 mm or more, and particularly preferably It is preferably 8 mm or more, more preferably 10 mm or more, and most preferably 12 mm or more.

[0157] A glass pane according to an embodiment of the present invention or a glass provided in a window according to an embodiment of the present invention The length of the plate is preferably 30 mm or more in the direction of polarization of the radio wave. For example, a direction perpendicular to the vertical line and parallel to the glass plate surface, or a direction perpendicular to the vertical line The direction may be parallel to the glass plate surface. For example, the direction may be perpendicular to the ground plane. The glass panes in a flat window installed in a room can be moved horizontally or vertically. If the length is sufficient in the direction of polarization, it can be used for radar and mobile phones. This makes it easier to send and receive radio signals.

[0158] In another aspect of the present specification, a wireless communication device including the glass plate according to the above embodiment is provided. It will be offered.

[0159] In this specification, the term "wireless communication device" refers to an electronic device medium that utilizes wireless communication. "Wireless communication devices" include mobile phones, tablets, personal computers, watches, glasses, etc. In this specification, a "wireless communication device" may include a front member and a back member. The glass plate according to the above embodiment may be used for at least a part of the face member or the back member. Typically, the device has a housing that holds the front surface member and the back surface member. In the space surrounded by the rear member and the housing, an element having a display function and a drive circuit for driving the element are provided. The display device may have an electric circuit board for displaying the image. At least the surface member side has a display function. It is possible to display information from the back side of the material depending on the purpose. The front and back members may be configured to display information by a display. It can be shaped according to the application and may be flat or curved. The front and back members have holes for a speaker, operation buttons, a camera lens, etc. Typically, the front member has holes for a speaker and an operation button, and the back member has It has a hole for the camera lens. The materials of the front surface member, the rear surface member and the housing part are, for example, glass, crystallized glass, phase-separated glass, etc. Steel, metal, wood, stone, ceramics, plastic, carbon fiber or Any mixtures of these or laminates thereof may be used.

[0160] The glass plate provided in the wireless communication device according to the present invention is laminated with other glass plates or transparent materials. The glass plate may be a chemically strengthened glass plate. The glass plate provided in the wireless communication device according to the present invention is a front member and a back member of the wireless communication device. It may be used on both surface members or on only one of them. The glass plate provided in the wireless communication device of the present invention is 18 mm thick and has a frequency of 1 Since the radio wave transmittance at 0.1 GHz is more than 20%, it is possible to transmit and receive radio waves using wireless communication devices. When it is installed in a wireless communication device, the radio wave transmittance is preferably 27 % or more, more preferably 28% or more, even more preferably 29% or more, and particularly preferably is 30% or more, and most preferably 32% or more. In addition, when both the front surface member and the rear surface member are provided with the glass plate according to the above embodiment, Radio waves at a frequency of 100 GHz converted to a glass plate with a thickness of 18 mm used as a surface component Transmittance and frequency of 100GHz converted to 18mm thickness of glass plate used as back surface material The difference between the radio wave transmittance in and is preferably 4% or more. If the difference in radio wave transmittance is 4% or more, The radio waves are transmitted and received through the surface member or the back member that has a higher radio wave transmittance. For example, if a speaker or other device is installed on the front side of the device, the transmission and reception of radio waves from the front side of the device can be suppressed. When there is a microphone, the surface material side is the side closest to the human head, so the surface material side has low radio wave transmittance. By using a glass plate, the radio waves reaching the human head can be weakened, and the back By using a glass plate with high radio wave transmittance on the surface material side, radio waves can be transmitted and received. Cut.

[0161] In one embodiment, the wireless communication device includes an antenna as a device for transmitting and receiving radio waves. The tenna may be adjacent to or in contact with the glass sheet, or may be formed inside the glass sheet. This improves the transmission and reception sensitivity of the antenna. In addition, the antenna has the following features: 1. It is preferable that the antenna is capable of transmitting and receiving electromagnetic waves with a frequency of 0 GHz or higher. The frequency of the wave is preferably 2.4 GHz or more, more preferably 5 GHz or more, and even more preferably At least 10 GHz, particularly preferably at least 15 GHz, and most preferably at least 25 GHz. There is no particular upper limit, but in consideration of the applications of the glass of the present invention, the frequency to be used is 100 GHz or less, and preferably 90 GHz or less.

[0162] In one embodiment, the thickness of the glass plate provided in the wireless communication device is a part of the back member or When used in the entirety, it is preferably 4 mm or less, more preferably 2.5 mm or less, and even more preferably 2.5 mm or less. Preferably 1.5 mm or less, particularly preferably 1.1 mm or less, and even more preferably 0.9 mm or less The thickness is preferably 0.7 mm or less. On the other hand, the thinner the glass plate, the weaker its strength becomes. The thickness does not have to be uniform, and it is preferable that the thickness is 0.5 mm or more. The thickness of the glass sheet may have a distribution. In the present specification, the thickness of the thickest part is defined as the "thickness of the glass sheet". (same in each case).

[0163] In one embodiment, the thickness of the glass plate provided in the wireless communication device is a part of the surface member. If used entirely, it is preferably 2.5 mm or less, more preferably 1.5 mm or less. More preferably, the thickness is 1.3 mm or less, particularly preferably, the thickness is 1.1 mm or less, and even more preferably, the thickness is 1.3 mm or less. The thickness is preferably 0.9 mm or less, and most preferably 0.7 mm or less. On the other hand, the thinner the glass plate, the stronger it becomes. It is preferable to have a thickness of 0.5 mm or more, as this may weaken the strength of the lens. The thickness may be varied, and can be determined depending on the application.

[0164] The visible light transmittance of the glass plate in a wireless communication device can be adjusted according to the application. The visible light transmittance of the glass plate used on the side displaying information is calculated based on a 3.85 mm thickness. and 60% or more is more preferable. The present disclosure includes the following embodiments. [1] A glass with a radio wave transmittance of 20% or more at a frequency of 100 GHz converted to an 18 mm thickness. Lass board. [2] The radio wave transmittance at a frequency of 100 GHz converted to an 18 mm thickness is 25% or more. 1] A glass plate according to the present invention. [3] The radio wave transmittance at a frequency of 100 GHz converted to an 18 mm thickness is 84% ​​or less. The glass plate according to [1] or [2]. [4] A plane wave with a frequency of 10 GHz and a field strength of 1 V / m is applied from a wave source 2 λ away from the aperture. When the light is incident on a 1.2λ glass plate, the electric field strength at an observation point 10λ away from the aperture is y( V / m), opening area S (mm 2 ) to λ 2 Let the value divided by x be the linear approximation y>(0.0 607×x). [5] Let y' be the approximate transmittance at a frequency of 100 GHz, and x' (mm) be the thickness of the glass plate. , any one of [1] to [4] where the exponential approximation is y'>exp(-0.081×x'). Item 1. The glass plate according to item 1. [6] Frequency x'' and radio wave transmittance y at frequencies from 6 to 20 GHz, converted to an 18 mm thickness The relationship between y and e is y = [constant 1] x e [定数2]×x’’ An exponential approximation to the function In a similar way, y''>0.8619e -0.015x’’ The glass plate according to any one of [1] to [5], [7] Area is 900mm 2 The glass plate according to any one of [1] to [6] above. [8] The specific gravity is 2.40 to 3.00, the Young's modulus is 60 GPa to 100 GPa, and the Average linear expansion coefficient from ℃ to 350℃ is 35×10 -7 ~120×10 -7 / ℃,[1] The glass plate according to any one of items [7] to [7]. [9] The amount of Na2O dissolved in the water resistance test was 0.001mg to 0.6mg.[1]~[8 ] The glass plate according to any one of the above items.

[10] T2 is 1750℃ or less, T4 is 1350℃ or less, T4-T L is -150℃ or higher, The glass plate according to any one of [1] to [9]. (However, T2 has a glass viscosity of 10 2 (dPa s), T4 is the temperature at which the glass viscosity Degree 10 4 (dPa s), T L is the liquidus temperature of glass.)

[11] Glass transition temperature T g [1] to

[10] , wherein the temperature is 400°C to 750°C. Glass plate on the plate.

[12] The glass plate according to any one of [1] to

[0011] , having a visible light transmittance Tv_A converted to a plate thickness of 3.85 mm of 30 to 92%.

[13] The solar transmittance Te converted to a plate thickness of 3.85 mm is 35-91%,[1]-

[12] The glass plate according to any one of claims 1 to 7.

[14] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3≦9 0≦B2O3≦15 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦15 0≦Li2O<0.01 1.2≦Na2O≦15.6 3.5≦K2O≦12.5 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 4.7≦R2O≦19.5 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 42<7Al2O3+3MgO≦66 0.25≦Na2O / R2O≦0.8 R2O+B2O3≦23 0≦PbO<0.001 The glass plate according to any one of [1] to

[13] ,

[15] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3≦6 0≦B2O3≦15 0≦MgO≦14 0≦CaO≦20 0≦SrO≦15 0≦BaO≦15 0≦Li2O<0.01 4≦Na2O≦17 1.9≦K2O≦14.2 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦3 5.9≦R2O≦20 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 23.5<7Al2O3+3MgO≦42 0.22≦Na2O / R2O≦0.85 R2O×MgO≦66 55≦SiO2+Al2O3≦76 0≦PbO<0.001 The glass plate according to any one of [1] to

[13] ,

[16] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 1.3≦Al2O3≦3.35 0≦B2O3≦15 0≦MgO≦4.8 0≦CaO≦20 0≦SrO≦4 0≦BaO≦15 0≦Li2O<0.01 0.1≦Na2O≦16 1≦K2O≦16 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦1.5 1.1≦R2O≦20 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 0≦7Al2O3+3MgO≦23.5 0.05≦Na2O / R2O≦0.8 0≦R2O+B2O3≦22 0≦PbO<0.001 0≦ZnO≦8 The glass plate according to any one of [1] to

[13] ,

[17] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 1.44≦Al2O3≦9 0≦B2O3≦2 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦1 0.01≦Li2O≦19.1 0≦Na2O≦16 0.9≦K2O≦16 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 0.91≦R2O≦20 0≦RO≦20 98≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 10<7Al2O3+3MgO-4Li2O≦66 0≦Na2O / R2O≦0.8 0≦PbO<0.001 The glass plate according to any one of [1] to

[13] ,

[18] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3≦7.8 0≦B2O3≦2 0≦MgO≦11.8 2≦CaO≦20 0≦SrO≦15 0≦BaO≦1 2.5≦Li2O≦19.52 0.15≦Na2O≦17.17 0.33≦K2O≦16.5 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 2.98≦R2O≦20 2≦RO≦20 98≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 -10<7Al2O3+3MgO-4Li2O≦10 0.05≦Na2O / R2O≦0.85 0.11≦K2O / R2O≦0.83 0≦PbO<0.001 The glass plate according to any one of [1] to

[13] ,

[19] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3≦5.5 0≦B2O3≦2 0≦MgO≦10.5 0≦CaO≦20 0≦SrO≦15 0≦BaO≦15 2.5≦Li2O≦20 0≦Na2O≦18.5 0≦K2O≦18.5 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 2.5≦R2O≦20 0≦RO≦20 98≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 -60≦7Al2O3+3MgO-4Li2O≦-10 0≦PbO<0.001 The glass plate according to any one of [1] to

[13] ,

[20] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 1.44≦Al2O3≦9 0.5≦B2O3≦13 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦1 0.01≦Li2O≦19.1 0≦Na2O≦16 0.9≦K2O≦16 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 0.91≦R2O≦20 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 10<7Al2O3+3MgO-4Li2O≦66 0≦Na2O / R2O≦0.8 0≦PbO<0.001 0≦ZnO≦3 The glass plate according to any one of [1] to

[13] , [twenty one] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 1≦Al2O3≦7.8 0.5≦B2O3≦15 0≦MgO≦11.8 2≦CaO≦20 0≦SrO≦15 0≦BaO≦1 4.25≦Li2O≦19.15 0.25≦Na2O≦15.15 0.60≦K2O≦15.5 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 5.10≦R2O≦20 2≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 -10<7Al2O3+3MgO-4Li2O≦10 0.05≦Na2O / R2O≦0.95 0.11≦K2O / R2O≦0.9 0≦PbO<0.001 The glass plate according to any one of [1] to

[13] , [twenty two] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0.5≦Al2O3≦15 0≦B2O3≦15 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦15 3.4 <Li2O≦20 0≦Na2O≦16.6 0≦K2O≦16.6 0≦ZrO2≦2 0.001≦Fe2O3≦5 0.001≦TiO2≦5 3.4 <R2O≦20 1≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 -60≦7Al2O3+3MgO-4Li2O≦-10 0≦PbO<0.001 The glass plate according to any one of [1] to

[13] , [twenty three] The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO2≦75 0≦Al2O3<1.3 0≦B2O3≦15 0≦MgO≦4.5 0≦CaO≦20 0≦SrO≦4 0≦BaO≦15 0≦Li2O<0.01 0≦Na2O≦14.4 1≦K2O≦16 0≦ZrO2≦2 0.001≦Fe2O3≦1.5 0.001≦TiO2≦5 1.1≦R2O≦18 0≦RO≦20 85≦SiO2+Al2O3+MgO+CaO+SrO+BaO+Li2O+Na2O +K2O+Fe2O3+TiO2≦100 0≦7Al2O3+3MgO≦22.6 0.05≦Na2O / R2O≦0.80 0≦PbO<0.001 0≦ZnO≦0.5 The glass plate according to any one of [1] to

[13] , [twenty four] A x radio wave transmittance is 0.0225m 2%~8400m 2 %, where A is the glass Area of ​​the plate (m 2 The glass plate according to any one of [1] to

[23] , [twenty five] The radio wave transmittance / t is 0.7% / mm to 84% / mm, where t is the thickness of the glass plate. The glass plate according to any one of [1] to

[24] , wherein the thickness is 1 / 2 mm.

[26] A window comprising the glass plate according to any one of [1] to

[25] .

[27] The window according to

[26] , which is for use in automobiles or building materials.

[28] A wireless communication device comprising the glass plate according to any one of [1] to

[25] . EXAMPLES

[0165] The present invention will be described in detail below with reference to examples. Not limited to this.

[0166] [Preparation of glass plate samples] Glass plates having the compositions (units: mol%) shown in Tables 1-1 to 1-28 below were prepared by the methods known to those skilled in the art. Specifically, the raw materials were placed in a platinum crucible so as to obtain the glass composition shown. The material was poured in and melted at 1550℃ for 2 hours, after which the molten liquid was poured onto a carbon plate and slowly cooled. Both sides of the obtained plate were polished to obtain a glass plate having a thickness of about 30 mm.

[0167] The method for determining the values ​​shown in Tables 1-1 to 1-28 will be described below. (1) Average linear expansion coefficient (α) at ​​50 to 350°C: The average linear expansion coefficient (α) is measured using a differential thermal expansion meter (TMA) and is in accordance with JIS R310 This was derived from the 1995 standard, No. 2. (2) Glass transition temperature (Tg): The glass transition temperature (Tg) is a value measured using TMA and is in accordance with JIS R3103-3 This was determined based on the standards of the 2001 edition. (3) Specific gravity (d): The specific gravity (d) was measured by measuring the density of a glass block of about 20 g, which was cut from a glass plate and did not contain any bubbles, using the Archimedes method. Measured by the Death method. (4) Viscosity: The viscosity was measured using a rotational viscometer, and the viscosity η was 10 2 Temperature T2 when it becomes dPa s (Reference temperature for solubility) and viscosity η is 10 4 dPa·s (T4) (the basis for moldability) The temperature (sub-temperature) was measured. (5) Liquidus temperature (T L ): A 5 g piece of glass cut from a glass plate was placed on a platinum plate and heated to a temperature higher than the glass transition point. After placing them in an electric furnace at the temperature of 17 hours, they are removed from the furnace and cooled. The presence or absence of precipitation on the surface and inside of the glass block was examined, and when no crystals were precipitated, the glass block was left for 17 hours. The lowest temperature at this time was taken as the liquidus temperature. (6)Young’s modulus (E): Young's modulus E was measured at 25°C by the ultrasonic pulse method (Olympus, DL35). (7)Water resistance: Measured as the amount of Na2O dissolved (mg) according to JIS R 3502 (1995). Ta. (8)Visible light transmittance (Tv_A): The glass plate is cut into a rectangular parallelepiped with a length of 30.0 mm, a width of 30.0 mm, and a thickness of 3.85 mm. The 30.0mm x 30.0mm surface was polished to a mirror finish. Therefore, the transmittance was measured using a spectrophotometer, and the visible light transmittance Tv_A was calculated. The spectrophotometer used was a Hitachi High-Technologies U4100. The weighting coefficient was the standard A light. The values ​​are calculated for a 2-degree field of view and are expressed as values ​​converted to a plate thickness of 3.85 mm. Here, the value converted to a plate thickness of 3.85 mm is the refractive index of the glass plate whose transmittance was measured. The reflectance of the glass plate is calculated from the refractive index using the Sellmeyer formula, and the multiple Taking reflection into account, the value of the glass plate (here, visible light transmittance Tv_A) is set to 3.85 mm thick. The value is converted to If the visible light transmittance Tv_A is 30 to 92%, it is marked as "○"; if it is greater than 92% or Cases less than 0% are indicated with "X". (9)Solar transmittance (Te): Te is measured by a spectrophotometer according to ISO-13837A:2008 and is The reflectance and transmittance Te were calculated and expressed as a value converted to a plate thickness of 3.85 mm. If the solar transmittance Te is 35 to 91%, it is marked as "○"; if it is greater than 91% or less than 35%, it is marked as "○". Cases where the value is smaller than the limit are indicated by "X". (10) Ultraviolet transmittance (Tuv): Tuv is defined in ISO-9050:2003. (11) Transmittance at 905 nm wavelength, transmittance at 1550 nm wavelength Measured using a spectrophotometer. Values ​​are expressed as converted values ​​for a plate thickness of 3.85 mm. (12) FeO content The crushed glass was decomposed at room temperature using a mixture of hydrofluoric acid and hydrochloric acid. Take a certain amount into a plastic container and immediately add 2,2'-dipyridyl solution and ammonium acetate. FeCl2+ buffer was added to the 2+ The coloring solution was diluted with ion-exchanged water to a certain amount. The absorbance at a wavelength of 522 nm was measured using an absorption spectrophotometer. The concentration was calculated from the calibration curve. The FeO content in the table was converted to Fe2O3. The amount of FeO is (13)Radio wave transmittance Thickness 18mm, radio wave transmittance at 100GHz, exponential approximation of the relationship between frequency and radio wave transmittance (Converted to 18mm thickness) Constant 1, and exponential approximation of the relationship between frequency and radio wave transmittance (18mm thickness) The constant 2 (converted to mm) was calculated using the method described above. The radio wave transmittance at z was obtained by exponential approximation as described above. The dielectric constant and dielectric loss were measured by a cavity resonance method. (14) Radio wave transmission rate of laminated glass Both sides of the glass plate were further polished to obtain a glass plate having a thickness of 2.0 mm. Two 2.0mm glass sheets are bonded together with a polyvinyl butyral (PVB) interlayer. After preliminary bonding under reduced pressure, the laminate was heated in an autoclave chamber. Laminated glass was obtained by applying heat and pressure. The thickness of the adhesive layer of the obtained laminated glass was 0. It was 7mm. The amount of radio wave transmission through the laminated glass obtained was measured using the free space method. The laminated glass obtained was placed between them, and the laminated glass was removed at the 100mm diameter opening. The amount of radio wave transmission through the laminated glass was measured, with the frequency set at 65 to 85 GHz. The measurements were performed in the range of . FIG. 4 shows the measured value of the radio wave transmission amount of the laminated glass of Comparative Example 1 and the electric field calculated by exponential approximation. 1 is a graph showing the calculated wave transmission amount. It was confirmed that the measured value and the calculated value matched well. Similar calculations were performed for Examples 3, 4, 11, and 25. , the radio wave transmission amount of the laminated glass of Comparative Example 1, Example 3, Example 4, Example 11, and Example 25 1 is a graph showing the measured values ​​and the calculated values ​​of the radio wave transmission amount obtained by exponential approximation. The frequency of the maximum value can be adjusted by the dielectric constant and the thickness of the glass. It was confirmed that this is the case.

[0168] In the table, "-" indicates that no measurement was performed, and the values ​​calculated from the composition are inclined. Shown by the body.

[0169] [Table 1-1]

[0170] [Table 1-2]

[0171] [Table 1-3]

[0172] [Table 1-4]

[0173] [Table 1-5]

[0174] [Table 1-6]

[0175] [Table 1-7]

[0176] [Table 1-8]

[0177] [Table 1-9]

[0178]

Table 1-10

[0179]

Table 1-11

[0180]

Table 1-12

[0181]

Table 1-13

[0182]

Table 1-14

[0183]

Table 1-15

[0184]

Table 1-16

[0185]

Table 1-17

[0186]

Table 1-18

[0187]

Table 1-19

[0188] [Table 1-20]

[0189] [Table 1-21]

[0190] [Table 1-22]

[0191] [Table 1-23]

[0192] [Table 1-24]

[0193] [Table 1-25]

[0194] [Table 1-26]

[0195] [Table 1-27]

[0196] [Table 1-28]

[0197] [Study of calculation model for radio wave transmittance] Using the glass plate shown as Comparative Example 1 in Table 1, the radio wave transmittance and the calculated The actual measurements were taken from a 30cm x 30cm glass plate using the free space method. The calculation model for the free space method is based on the Microw Used in simulations in ave Studio 2016 electromagnetic field simulator The basic conditions for the simulation are as described above in this specification. As a result of the investigation, it was decided that the value of tan δ to be input in the calculation model should be rounded down to three decimal places. By adjusting the accuracy, the calculation model in the high frequency range (e.g., 50 GHz or higher) Optimized and measured for glass plates of different thickness (e.g. 5 mm and 10 mm) It was found that a more accurate fit could be obtained.

[0198] Using this optimized calculation model, the radio wave transmission of a comparative example (conventional glass plate) was The transmittance or approximate transmittance was determined and compared with those of Examples 1 to 249. In the example glass, the radio wave transmittance at a frequency of 100 GHz converted to a thickness of 18 mm is The results are shown to be superior to the comparative examples, with A being 0.00. 9m 2 The value of radio wave transmittance × A at 3.85 mm thickness and the value of radio wave transmittance / thickness t at 3.85 mm thickness are It was clear that all of these were superior to the comparative examples.

[0199] [Comparison of radio wave transmittance] 2A to 2D show the electric field distribution of the glass plates of the comparative example and examples 1 to 20 at a thickness of 18 mm. 1 is a graph showing the electric field intensity ratio of the comparative example. The black curve shows the electric field intensity ratio of the comparative example. Exponential approximation of the electric field strength ratio curve ([radio wave transmittance] = [constant 1] × e[定数2]×[周波数] (i.e., "exponential approximation of the relationship between frequency and field strength ratio") Similarly, each of the gray curves represents the electric field intensity of each example. The gray dotted line represents the radio wave transmittance calculated by exponential approximation. The glass plate of the embodiment has a generally high radio wave transmittance in the gigahertz frequency band. It is understood that:

[0200] Figures 3A to 3D show the relationship between the exponential approximation obtained from Figures 2A to 2D and the typical frequency. The approximate transmittance is calculated and displayed. 3C corresponds to FIG. 2C, and FIG. 3D corresponds to FIG. 2D, respectively. Each of the examples has radio wave transmission characteristics that are significantly improved compared to the comparative examples. It is understood that. In addition, the glass plates of Examples 21 to 249 are in the composition ranges described in the above-mentioned 10 types of embodiments. Since it is included in either of these, it has high radio wave transparency. The dielectric loss tan δ at a frequency of 35 GHz was is 0.001 or more and 0.019 or less, Examples 2, 4, 8 to 10, 12, 14, 16, 21 to In the glass of No. 23, tan δ is 0.001 or more and 0.013 or less, and in Examples 1, 3, 11, and 13 For glasses 1, 15, and 24, tan δ was 0.001 or more and 0.011 or less. From the results of Examples 3, 4, 11, and 25, the laminated glass of the Examples is comparatively It has a higher radio wave transmittance than the comparative laminated glass. [Industrial Applicability]

[0201] The glass plate of the present invention is suitable for use in buildings and buildings in which the use of radio wave devices such as mobile phones and radars is anticipated. It can be widely used as a window material in automobiles and vehicles. Furthermore, the glass plate of the present invention is suitable for wireless communication using high-frequency radio waves of 1.0 GHz or more. It can be suitably used as a glass plate for equipment. In addition, Japanese Patent Application No. 2017-90141 filed on April 28, 2017 and The specification and patent of Japanese Patent Application No. 2017-140687 filed on July 20, 2017 The entire contents of the claims, abstract and drawings are incorporated herein by reference as though fully set forth in the specification of the present invention. , is something that is adopted. [Explanation of symbols]

[0202] 10 frames, 20 apertures, 30 sources, 40 observation points

Claims

1. The radio wave transmittance at a frequency of 100 GHz converted to an 18 mm thickness is 20% or more, The content of each component is as follows, expressed as mole percentage based on oxide: 55≦SiO ２ ≦75 1.44≦Al ２ O ３ ≦9 0.5≦B ２ O ３ ≦13 0≦MgO≦15 0≦CaO≦20 0≦SrO≦15 0≦BaO≦1 0.01≦Li ２ O≦19.1 0≦Na ２ O≦16 0.9≦K ２ O≦16 0≦ZrO ２ ≦2 0.001≦Fe ２ O ３ ≦5 0.001≦TiO ２ ≦5 0.91≦R ２ O≦20 0≦RO≦20 9.5≦SiO ２ +Al ２ O ３ +MgO+CaO+SrO+BaO+Li ２ O+Na ２ O +K ２ 2019 ２ O ３ 2019 ２ ≦100 <h2 style=";text-align:left;direction:ltr">15<7Al<h2 style=";text-align:left;direction:ltr"> ２ <h2 style=";text-align:left;direction:ltr"> O<h2 style=";text-align:left;direction:ltr"> ３ <h2 style=";text-align:left;direction:ltr"> +3MgO-4Li<h2 style=";text-align:left;direction:ltr"> ２ <h2 style=";text-align:left;direction:ltr"> O≦66 0≦Na ２ O / R ２ O≦0.8 0≦PbO<0.001 0≦ZnO≦3 R ２ O+B ２ O ３ ≦20 Including, RO represents the total content of MgO, CaO, SrO, and BaO; R ２ O is Li ２ O, Na ２ O and K ２ A glass plate showing the total O content.

2. The radio wave transmittance at a frequency of 100 GHz converted to 18 mm thickness is 25% or more.

2. The glass plate according to claim 1.

3. The radio wave transmittance at a frequency of 100 GHz converted to an 18 mm thickness is 84% ​​or less. The glass plate according to claim 1 or 2.

4. A plane wave with a frequency of 10 GHz and an electric field strength of 1 V / m was applied from a wave source 2 λ away from the aperture. When incident on a 1.2 λ glass plate, the electric field strength at an observation point 10 λ away from the aperture is y ( V / m), opening area S (mm ２ ) to λ ２ Let the value divided by x be x, and the linear approximation is y>(0.0 607×x). The glass plate according to any one of claims 1 to 3.

5. Let y' be the approximate transmittance at a frequency of 100 GHz, and x' (mm) be the thickness of the glass plate.

5. Any one of claims 1 to 4, wherein the exponential approximation is y'>exp(-0.081 x'). The glass plate according to claim 1.

6. Frequency x'' and radio wave transmittance y at frequencies between 6 and 20 GHz, converted to a thickness of 18 mm The relationship between y and e is y = [constant 1] x e ［定数２］×ｘ’’ An exponential approximation to the function In a similar way, y''>0.8619e －０．０１５ｘ’’ The glass plate according to any one of claims 1 to 5.

7. The area is 900 mm ２ The glass plate according to any one of claims 1 to 6.

8. The specific gravity is 2.40 to 3.00, the Young's modulus is 60 GPa to 100 GPa, and Average linear expansion coefficient of 35×10 －７ ~120 x 10 －７ / °C.

8. The glass plate according to any one of 1 to 7.

9. Na in water resistance test ２ Claims 1 to 8, wherein the amount of O eluted is 0.001 mg to 0.6 mg. The glass plate according to any one of claims 1 to 7.

10. T ２ is 1750°C or less, T ４ is 1350°C or less, T ４ -T Ｌ is -150°C or higher; The glass plate according to any one of claims 1 to 9. (However, T ２ The glass viscosity is 10 ２ (dPa s), T ４ Glass adhesive Degree 10 ４ (dPa s), T Ｌ is the liquidus temperature of glass.)

11. Glass transition temperature T ｇ According to any one of claims 1 to 10, the temperature is 400°C to 750°C. Glass

12. The visible light transmittance Tv_A converted to a plate thickness of 3.85 mm is 30 to 92%.

12. The glass plate according to any one of claims 11 to 11.

13. The solar radiation transmittance Te converted to a plate thickness of 3.85 mm is 35 to 91%. The glass plate according to any one of claims 1 to 7.

14. A x radio wave transmittance is 0.0225m ２ ・%~8400m ２ % where A is the glass Area of ​​the plate (m ２ The glass plate according to any one of claims 1 to 13,

15. The radio wave transmittance / t is 0.7% / mm to 84% / mm, where t is the thickness of the glass plate. The glass plate according to any one of claims 1 to 14, wherein the thickness is 1 / 2 mm.

16. A window comprising a glass pane according to any one of claims 1 to 15.

17. 17. The window of claim 16, which is for an automobile or a building material.

18. A wireless communication device comprising the glass plate according to any one of claims 1 to 15.

Images