Phase-separated glass, and laminate

Abstract

The present invention relates to a phase-separated glass having an average diffuse reflectance of 50.0% or more at a wavelength of 450-650 nm, a haze of 2.0% or less at a wavelength of 1350 nm, and a haze of 2.0% or less at a wavelength of 1600 nm.

Description

Phase-separated glass, laminate

[0001] This invention relates to phase-dividing glass. Furthermore, this invention also relates to laminates having the above-mentioned phase-dividing glass.

[0002] Infrared technologies, such as infrared communication and infrared sensing, are used in various fields. These technologies typically utilize modules that have an infrared light receiving unit. In the infrared light receiving unit, optical filters are often used to prevent visible light and other light sources from entering the unit.

[0003] The optical filter described above has the function of blocking visible light and transmitting infrared light. The optical filter described above (infrared transmission filter) is often black because it absorbs visible light. As an example of the infrared transmission filter described above, the infrared transmission filter described in Patent Document 1 is known. The infrared transmission filter described in Patent Document 1 is disclosed to have an infrared-transmitting black layer and a design layer containing a pigment.

[0004] Japanese Patent Application Publication No. 2023-069735

[0005] The application range of infrared-based technologies, as described above, is expanding, and there is a need for further novel optical filters made of new materials. More specifically, there is a need for novel phase-splitting glass that can be applied to infrared transmission filters as a material for optical filters.

[0006] This invention has been made in view of the above problems, and aims to provide a novel phase-splitting glass applicable to infrared transmission filters. Furthermore, this invention also aims to provide a novel laminate composed of the said phase-splitting glass.

[0007] As a result of diligent research into the above-mentioned problems, the inventors of the present invention have found that a novel phase-splitting glass applicable to infrared transmission filters can be obtained with the following configuration, and have completed the present invention.

[0008] That is, the present inventors have found that the above problems can be solved by the following configurations. [1] A phase-separated glass having an average diffuse reflectance of 50.0% or more at a wavelength of 450 to 650 nm, a haze of 2.0% or less at a wavelength of 1350 nm, and a haze of 2.0% or less at a wavelength of 1600 nm. [2] The phase-separated glass according to [1], having a direct transmission rate of 80.0% or more at 1350 nm and 1600 nm. [3] When the direct transmission rate at a wavelength of 700 nm is T ７００ and the direct transmission rate at a wavelength of 900 nm is T ９００ , S ７００－９００ obtained by the following formula (1) is 0.14% / nm or more. The phase-separated glass according to [1] or [2]. (1) S ７００－９００ =(T ９００ -T ７００ ) / 200 In formula (1), the units of T ７００ and T ９００ are %. [4] The phase-separated glass according to any one of [1] to [3], having an L ＊ value of the reflected light measured under the following conditions of 70.0 or more. Conditions: - Measurement wavelength range: 360 to 740 nm - Light source for measurement: Pulsed xenon lamp - Illumination: Diffuse illumination - Light receiving optical system: 8° direction light receiving - Integrating sphere size: Φ152 mm - Observation light source: D65 light source - Measurement diameter: 3 mmφ [5] In the Log differential pore volume distribution curve of the width of the phase-separated structure in the phase-separated glass, the average width of the phase-separated structure based on volume is 70 to 145 nm. The phase-separated glass according to any one of [1] to [4]. [6] In the Log differential pore volume distribution curve of the width of the phase-separated structure, when the width of the phase-separated structure showing the maximum volume is W ｍｏｄｅ , the width of the phase-separated structure included in the range of 0.6W ｍｏｄｅ to 1.4W ｍｏｄｅ is 90% or more of the total volume. The phase-separated glass according to any one of [1] to [5]. [7] In terms of molar percentage representation based on oxides, the content of SiO ２ is 45.0 to 85.0%, the content of MgO is 13.0 to 30.0%, and P ２ O ５The content of is 0.5 to 10.0%, and the content of BaO is 0.5 to 30.0%, and Na ２ The O content is 0.1 to 30.0%, and Al ２ O ３ A phase-separated glass according to any one of [1] to [6], having a content of 0.0 to 3.0%. [8] In mole percentage based on oxide, SiO ２ The content is 45.0-80.0%, B ２ O ３ [1] to [7], wherein the content of is 15.0 to 35.0% and the total content of alkali metal oxides is 3.0 to 12.0%. [9] A phase-splitting glass according to any one of [1] to [8], used as an infrared transmission filter.

[10] A laminate having a phase-splitting glass according to any one of [1] to [9] and a visible light reflective film.

[11] A laminate having a phase-splitting glass according to any one of [1] to [9] and a multilayer film composed of an inorganic material.

[12] The laminate according to

[10] or

[11] , wherein the visible light reflective film is a multilayer reflective film composed of an inorganic material.

[0009] According to the present invention, a novel phase-splitting glass applicable to infrared transmission filters can be provided. Furthermore, according to the present invention, a novel laminate composed of the phase-splitting glass can be provided.

[0010] Figure 1 is a schematic cross-sectional view of the phase structure formed by spinodal degradation. Figure 2 is a schematic cross-sectional view of the phase structure formed by binodal degradation.

[0011] The present invention will now be described in detail. The following descriptions of constituent elements may be based on typical embodiments of the present invention, but the present invention is not limited to such embodiments.

[0012] The meanings of terms used in this specification are as follows: In this specification, numerical ranges expressed using "~" mean a range that includes the numbers written before and after "~" as the lower and upper limits. In this specification, "phase-split glass" refers to glass containing two or more glass phases. In this specification, "visible light region" refers to the wavelength range of 400 to 760 nm, and "visible light" refers to electromagnetic waves in the above wavelength range. Furthermore, "infrared light region" refers to the wavelength range of over 760 nm and up to 1000 μm, and "infrared light" refers to electromagnetic waves in the above wavelength range.

[0013] <Phase Splitting Glass> The phase splitting glass according to the embodiment of the present invention has an average diffuse reflectance of 50.0% or more at wavelengths of 450 to 650 nm, a haze of 2.0% or less at 1350 nm, and a haze of 2.0% or less at 1600 nm. The phase splitting glass according to the embodiment of the present invention is a novel glass having the above characteristics. Having the above characteristics, it diffusely reflects light in the wavelength range included in the visible light region (450 to 650 nm) and does not easily scatter light in the wavelength range included in the infrared light region (for example, 1350 to 1600 nm). Therefore, the phase splitting glass according to the embodiment of the present invention functions as an infrared transmission filter that transmits infrared light and blocks visible light. Furthermore, because it diffusely reflects light in the wavelength range included in the visible light region (450 to 650 nm), it exhibits a white color with excellent design appeal.

[0014] The phase-splitting glass according to an embodiment of the present invention will be described in detail below.

[0015] [Optical Properties] The diffuse reflectance spectrum of the phase-splitting glass according to the embodiment of the present invention is obtained using a spectrophotometer (Konica Minolta: CM-5). Specifically, the measurement is performed by removing specular reflection under the following conditions. Conditions: ・Measurement wavelength range: 360 to 740 nm ・Measurement light source: pulsed xenon lamp ・Illumination: diffuse illumination ・Receiving optical system: 8° direction receiving ・Integrating sphere size: Φ152 mm ・Observation light source: D65 light source ・Measurement diameter: 3 mmφ When performing the above measurement, a black velvet cloth is placed on the opposite side of the light source from the measurement sample. When the measurement is performed with the above spectrophotometer, a diffuse reflectance spectrum is obtained with the vertical axis representing diffuse reflectance and the horizontal axis representing wavelength. Note that diffuse reflectance refers to the reflectance excluding the light reflected by specular reflection.

[0016] As described above, the phase-splitting glass according to the embodiment of the present invention has an average diffuse reflectance of 50.0% or more at wavelengths of 450 to 650 nm, preferably 50.0 to 80.0%. The average diffuse reflectance at wavelengths of 450 to 650 nm is obtained by arithmetic mean of the diffuse reflectances of measurement points in the above wavelength range. The average diffuse reflectance at wavelengths of 450 to 650 nm is preferably 51.0% or more, may be 55.0% or more, or may be 60.0% or more, in terms of superior design. The diffuse reflectance at wavelengths of 450 to 650 nm is often 80.0% or less, preferably 70.0% or less, and more preferably 65.0% or less.

[0017] Furthermore, the chromaticity and lightness of reflected light can be measured using the spectrophotometer described above. The chromaticity of reflected light can be measured under the same conditions as described above. In this specification, the chromaticity and lightness of reflected light are defined as L ＊ a ＊ b ＊ The numerical value represented by the color system is used. L of reflected light ＊ The value is preferably 70.0 or higher, and more preferably 70.0 to 90.0. (Reflected light L) ＊ The value is preferably 70.0 or higher, more preferably 75.0 or higher, even more preferably 77.0 or higher, particularly preferably 80.0 or higher, and most preferably 82.0 or higher, in terms of superior design aesthetics. The L of the reflected light mentioned above. ＊The value is often 90.0 or less. (Reflected light a) ＊ The absolute value of the a is not particularly limited, but is preferably 20.00 or less, more preferably 10.00 or less, and even more preferably 5.00 or less. ＊ The absolute value of the value may be 0.00 or greater. a of the reflected light ＊ The value may also preferably be negative. (Reflected light b) ＊ The absolute value of the value is not particularly limited, but is preferably 30.00 or less, more preferably 20.00 or less, and even more preferably 10.00 or less. (Reflected light b) ＊ The absolute value of the value may be 0.00 or greater. Reflected light b ＊ The value may also preferably be negative.

[0018] The total light transmittance, diffuse light transmittance, and spectral haze at each wavelength of the phase-splitting glass according to the embodiment of the present invention are measured using a spectroscopic haze meter (HSP-150VIR, manufactured by Murakami Color Technology Laboratory Co., Ltd.). The measurement conditions conform to ISO 14782.

[0019] As described above, the phase-splitting glass according to the embodiment of the present invention has a haze of 2.0% or less at a wavelength of 1350 nm, preferably 1.5% or less, more preferably 1.0% or less, and may also be 0.5% or less. The haze at a wavelength of 1350 nm may be 0.0% or more. As described above, the phase-splitting glass according to the embodiment of the present invention has a haze of 2.0% or less at a wavelength of 1600 nm, preferably 1.5% or less, more preferably 1.0% or less, and even more preferably 0.5% or less. The haze at a wavelength of 1600 nm may also be 0.0% or more. The haze at a wavelength of 550 nm of the phase-splitting glass according to the embodiment of the present invention is preferably 50.0% or more, more preferably 80% or more, and even more preferably 90% or more. Furthermore, the haze at a wavelength of 650 nm of the phase-splitting glass according to the embodiment of the present invention is preferably 20.0% or more, more preferably 40% or more, and even more preferably 50% or more. The haze at a wavelength of 650 nm may also be 95% or less. Furthermore, the haze of the phase-splitting glass according to the embodiment of the present invention at a wavelength of 800 nm is preferably 80.0% or less, more preferably 60% or less, and even more preferably 40% or less. The haze at a wavelength of 800 nm may be 5% or more. Furthermore, the haze of the phase-splitting glass according to the embodiment of the present invention at a wavelength of 900 nm is preferably 60.0% or less, more preferably 40% or more, and even more preferably 20% or more. The haze at a wavelength of 900 nm may be 1% or more.

[0020] Furthermore, when measurements are performed with the above-described apparatus, a diffuse light transmission spectrum is obtained in which the horizontal axis is wavelength and the vertical axis is diffuse light transmittance. In the embodiment of the present invention, the phase-splitting glass preferably has a peak in the wavelength range of 400 to 800 nm in the above-described diffuse light transmission spectrum. Having a peak means that the diffuse light transmittance shows a maximum value in the above-described wavelength range. Furthermore, in the embodiment of the present invention, the phase-splitting glass more preferably has a peak in the wavelength range of 500 to 750 nm in the above-described diffuse light transmission spectrum, and even more preferably has a peak in the wavelength range of 600 to 700 nm.

[0021] The straight-line transmittance of the phase-splitting glass according to the embodiment of the present invention is measured using a spectrophotometer (Shimadzu Corporation: UV-Vis-NIR spectrophotometer "SolidSpec-3700i UV"). The measurement wavelength range is 350 to 1600 nm. The light source is a 50 W halogen lamp. When measurements are performed using the above spectrophotometer, a transmittance spectrum is obtained with transmittance on the vertical axis and wavelength on the horizontal axis.

[0022] The straight-line transmittance at 1350 nm of the phase-splitting glass according to the embodiment of the present invention is preferably 80.0% or higher, and more preferably 80.0 to 99.0%. When used as an infrared transmission filter for a sensor, the straight-line transmittance at 1350 nm is preferably 80.0% or higher, more preferably 85.0% or higher, and even more preferably 90.0% or higher, in order to further improve the sensitivity and accuracy of the sensor. In addition, the straight-line transmittance at 1350 nm is often 99.0% or lower.

[0023] Furthermore, the straight-line transmittance at 1600 nm of the phase-splitting glass according to the embodiment of the present invention is preferably 80.0% or more, and more preferably 80.0 to 99.0%. When used as an infrared transmission filter for a sensor, the straight-line transmittance at 1600 nm is preferably 80.0% or more, more preferably 85.0% or more, and even more preferably 90.0% or more, in order to further improve the sensitivity and accuracy of the sensor. Also, the straight-line transmittance at 1600 nm is often 99.0% or less. Furthermore, the phase-splitting glass according to the embodiment of the present invention preferably has a straight-line transmittance of 80.0% or more at 1350 nm and a straight-line transmittance of 80.0% or more at 1600 nm.

[0024] The straight-line transmittance at 900 nm of the phase-splitting glass according to the embodiment of the present invention is preferably 40.0% or higher. Furthermore, the straight-line transmittance at 700 nm is preferably 50.0% or lower. In addition, the average transmittance in the visible light region is preferably 40.0% or lower.

[0025] The internal straight-line transmittance at 1350 nm of the phase-splitting glass according to the embodiment of the present invention is preferably 92.0 to 99.9%. When used as an infrared transmission filter for a sensor, the internal straight-line transmittance at 1350 nm is preferably 92.0% or higher, more preferably 94.0% or higher, and even more preferably 96.0% or higher, in order to further improve the sensitivity and accuracy of the sensor. In addition, the internal straight-line transmittance at 1350 nm is often 99.9% or lower.

[0026] Furthermore, the internal straight-line transmittance at 1600 nm of the phase-splitting glass according to the embodiment of the present invention is preferably 92.0 to 99.9%. When used as an infrared transmission filter for a sensor, the internal straight-line transmittance at 1600 nm is preferably 92.0% or higher, more preferably 94.0% or higher, and even more preferably 96.0% or higher, in order to further improve the sensitivity and accuracy of the sensor. Also, the internal straight-line transmittance at 1600 nm is often 99.9% or lower. Note that the internal straight-line transmittance refers to the value obtained by removing the effect of interfacial reflection from the above straight-line transmittance, and is defined by the following formula.

[0027]

[0028] In the above formula, T ｉｎｔ is the internal straight-line transmittance, and its unit is %. In the above formula, T is the straight-line transmittance, and it is converted to a value between 0 and 1 before being substituted. In the above formula, R is the surface reflectance, and it takes a value between 0 and 1.

[0029] Furthermore, in the embodiment of the present invention, the phase-splitting glass has a straight-line transmittance at a wavelength of 700 nm in the above transmittance spectrum, which is T ７００ The straight-line transmittance at a wavelength of 900 nm is defined as T ９００ In this case, S can be calculated using the following formula (1). ７００－９００ It is also preferable that the concentration is 0.10% / nm or higher. (1) S ７００－９００ = (T ９００ -T ７００ ) / 200 In formula (1), T ７００ and T ９００ The unit is %. Note that "200" in formula (1) corresponds to the wavelength difference, and its unit is nm. The above S ７００－９００ T is the straight-line transmittance.７００ and straight-line transmittance T ９００ This corresponds to the slope of the transmittance spectrum obtained from the above S. ７００－９００ When the density is 0.1 to 0.8% / nm, the phase-splitting glass according to the embodiment of the present invention is preferable because it is more likely to function as an infrared transmission filter that transmits infrared light and blocks visible light. ７００－９００ When the concentration is 0.1 to 0.8% / nm, it is preferable because it exhibits a highly aesthetically pleasing white color while also having superior infrared transmittance. ７００－９００ The concentration of S is more preferably 0.14% / nm or higher, and even more preferably 0.15% / nm or higher. ７００－９００ The larger the value, the more pronounced the optical properties become due to the shielding of visible light and the transmission of infrared light. ７００－９００ The concentration is often 0.50% / nm or less.

[0030] [Physical Properties] The phase-separated glass according to the embodiment of the present invention comprises two or more glass phases, the glass phases constituting a phase-separated structure (see Figures 1 and 2). The shape of the glass phases included in the phase-separated structure is not particularly limited. For example, the phase-separated structure may consist of at least one glass phase that is spherical, rod-shaped, or continuously bonded (see Figure 1). Hereinafter, the width of the structure formed by one of the glass phases is referred to as the "width of the phase-separated structure". The width of the phase-separated structure is measured, for example, by the following method.

[0031] First, in the case where the phase structure is formed by spinodal decomposition, which will be described later (see Figure 1), the width of the phase structure refers to the diameter of the structure of one of the glass phases (width Ws in Figure 1). Typically, if one glass phase and the other glass phase have different solubility in an acid or alkali, one glass phase can be dissolved, and the width of the phase structure of the dissolved glass phase can be measured as the pore diameter. More specifically, for example, in Figure 1, if glass phase S1 is more easily soluble in acid than glass phase S2, immersing the phase-separated glass in an acid such as hydrochloric acid will selectively remove glass phase S1, and a structure corresponding to the phase structure of glass phase S1 will be formed as pores. By measuring and analyzing the formed pores, for example by the mercury intrusion method, a pore distribution can be obtained. In this specification, the information obtained from the above pore distribution is considered to be information on the width of the phase structure of glass phase S1. When the above measurement is performed by the mercury intrusion method, a volume distribution curve of the phase structure width (so-called log differential pore volume distribution) can be obtained. Here, in the Log differential pore volume distribution curve of the phase width, the horizontal axis represents the phase width (unit: nm), and the vertical axis represents the Log differential pore volume (unit: mL / g).

[0032] Furthermore, in the case where the phase structure is formed by binodal decomposition described later (see Figure 2), the width of the phase structure refers to the particle size of the particulate phase (glass phase B1 in Figure 2) (width Wb in Figure 2). More specifically, first, the surface or cross-section of the phase glass is observed using a scanning electron microscope (SEM), and the equivalent circle diameter of 100 particulate phases is measured. Next, from the obtained equivalent circle diameter information, a log differential pore volume distribution curve is created, assuming that the particulate phase is spherical. In this specification, the information obtained from the above log differential pore volume distribution curve is considered to be information on the width of the phase structure of the particulate phase. That is, the log differential pore volume distribution curve obtained from the measurement is considered to be the log differential pore volume distribution curve of the width of the phase structure.

[0033] From the log differential pore volume distribution curve of the phase structure width obtained as described above, the volume-based average width of the phase structure in the phase glass (hereinafter also simply referred to as "average width") can be obtained. In the log differential pore volume distribution curve of the phase structure width in the phase glass, the volume-based average width of the phase structure is preferably 70 to 145 nm. The above average width of the phase structure is preferably 70 nm or more, more preferably 72 nm or more, even more preferably 74 nm or more, and so on, in order of preference, 75 nm or more, 76 nm or more, and 78 nm or more. Furthermore, the above average width of the phase structure is preferably 145 nm or less, more preferably 140 nm or less, even more preferably 135 nm or less, and so on, in order of preference, 130 nm or less, 125 nm or less, 120 nm or less, 115 nm or less, and 110 nm or less. If the average width of the phase structure is within the above range, it is possible to scatter short-wavelength visible light while suppressing the scattering of near-infrared light, which is longer than visible light. As a result, it is easy to obtain a phase-split glass that can achieve both a white appearance and high near-infrared transmittance.

[0034] Furthermore, the volume distribution curve of the phase structure width obtained as described above yields the value of the phase structure width that exhibits the maximum volume. Here, in the log differential pore volume distribution curve of the phase structure width, the value of the phase structure width that exhibits the maximum volume is W ｍｏｄｅ In that case, 0.6W ｍｏｄｅ ~1.4W ｍｏｄｅ It is also preferable that the width of the phase structure included in the range is 90% or more of the total volume. ｍｏｄｅ ~1.4W ｍｏｄｅ It is also preferable that the width of the phase structure included in the range is 95% or more of the total volume. ｍｏｄｅ ~1.4W ｍｏｄｅ The width of the phase structure included in this range may be 100% of the total volume. ｍｏｄｅ ~1.4W ｍｏｄｅ In other words, if the width of the phase structure included in the range is 90% or more of the total volume, then the above W ｍｏｄｅThis means that 90% of the total volume falls within a width range of ±40% of the phase structure when the value is set as the baseline (0%). When the above characteristics are met, the distribution of phase structure widths is sharp, and it is possible to scatter short-wavelength light more selectively, so the resulting phase glass tends to have a spectral spectrum with a steeper gradient of transmittance from the visible region to the near-infrared region.

[0035] In the phase-splitting glass according to an embodiment of the present invention, the refractive index difference between the glass phase with the highest refractive index and the glass phase with the lowest refractive index is preferably 0.01 to 0.50. From the standpoint of superior design aesthetics, the refractive index difference is preferably 0.01 or greater, more preferably 0.02 or greater, and even more preferably 0.05 or greater. The refractive index difference can be calculated, for example, by analyzing the compositions of the glass with the highest refractive index and the glass with the lowest refractive index, separately manufacturing glass of each composition, and measuring the refractive index of the manufactured glass. The d-line (589.3 nm) is used for measuring the refractive index. The refractive index difference is preferably 0.50 or less, more preferably 0.40 or less, and even more preferably 0.30 or less. Furthermore, when the refractive index difference at a wavelength of 1350 nm is measured in the same manner as above, it is preferable that it is smaller than the refractive index difference measured using the d-line.

[0036] The shape of the phase-splitting glass according to the embodiment of the present invention is not particularly limited and may be plate-shaped, cylindrical, prismatic, or cylindrical. When the phase-splitting glass according to the embodiment of the present invention has a plate shape, the plate thickness of the phase-splitting glass according to the embodiment of the present invention is not particularly limited, but is preferably 0.1 to 10 mm. The plate thickness of the phase-splitting glass is preferably 0.1 mm or more, more preferably 0.3 mm or more, even more preferably 0.5 mm or more, and particularly preferably 0.7 mm or more, in terms of making it less prone to breakage. Furthermore, the plate thickness of the phase-splitting glass according to the embodiment of the present invention is preferably 10 mm or less, more preferably 5 mm or less, even more preferably 2 mm or less, and particularly preferably 1 mm or less. When the plate thickness is below the above, internal scattering becomes smaller, the component of reflected light becomes larger, and the design quality is more easily improved.

[0037] Furthermore, the phase-splitting glass according to the embodiment of the present invention preferably has high in-plane uniformity. High in-plane uniformity means that when a 50 mm x 50 mm area of ​​the phase-splitting glass is divided into 25 10 mm x 10 mm areas, the difference in the width of the phase-splitting structure showing the maximum volume in each area is small. More specifically, it is preferable that the value obtained by measuring the width of the phase-splitting structure showing the maximum volume in each of the 25 areas and subtracting the width of the phase-splitting structure showing the maximum volume (the minimum value) from the width of the phase-splitting structure showing the maximum volume (the maximum value) is 20 nm or less. High in-plane uniformity makes it less likely for the amount of light transmitted to change depending on the position on the plane, and thus the detection accuracy of the sensor tends to be higher.

[0038] Furthermore, the phase-splitting glass according to the embodiment of the present invention may contain a crystalline phase, but it is also preferable that it does not contain a crystalline phase. Not containing a crystalline phase means that when an X-ray diffraction measurement is performed and an X-ray diffraction chart is obtained, no clear peaks are observed.

[0039] Furthermore, the phase-splitting glass according to the embodiment of the present invention may have an etching layer on its surface. Preferably, the etching layer is a layer in which one of the glass phases constituting the phase-splitting glass is selectively removed. The etching layer can be formed by contacting the phase-splitting glass with an acid or alkali for a controlled time, allowing etching to proceed only near the surface of the phase-splitting glass. When the etching layer is present, irregularities of a predetermined size exist on the surface of the phase-splitting glass. When these irregularities exist on the surface of the phase-splitting glass, the effective refractive index can change continuously in the direction of film thickness, thus providing an anti-reflective function.

[0040] [Composition and Method for Manufacturing Phase-Splitting Glass] The phase-splitting glass according to the embodiment of the present invention has an average diffuse reflectance of 50.0% or more at wavelengths of 450 to 650 nm, a haze of 2.0% or less at wavelengths of 1350 nm, and a haze of 2.0% or less at wavelengths of 1600 nm. It should be noted that the composition of the phase-splitting glass according to the embodiment of the present invention described below refers to the composition of the phase-splitting glass as a whole, and is not intended to refer to the composition of each of the two or more glass phases present in the phase-splitting glass.

[0041] The phase-separated glass according to the embodiment of the present invention preferably has a composition that can undergo spinodal decomposition or binodal decomposition, and more preferably has a composition that can undergo spinodal decomposition. Examples of a composition system that can undergo spinodal decomposition include SiO ２ -B ２ O ３ - Alkali metal oxides (e.g., Na ２ O, and K ２ O) system, and SiO ２ -B ２ O ３ - Alkali metal oxide system, comprising alkaline earth metal oxide (for example, at least one selected from the group consisting of CaO, SrO, and BaO), ZnO, Al ２ O ３ , and ZrO ２ Examples of systems include those comprising at least one selected from the group consisting of . Other systems of composition that can undergo spinodal decomposition include SiO ２ -P ２ O ５ - Alkali metal oxide system, SiO ２ -B ２ O ３ -CaO-MgO-Al ２ O ３ -TiO ２ Other examples include systems such as SiO ２ -B ２ O ３ - Alkali metal oxides (e.g., Na ２ O, and K ２ O) system, or SiO ２ -B ２ O３ - An alkali metal oxide system, comprising at least one selected from the group consisting of alkaline earth metal oxides (e.g., at least one selected from the group consisting of CaO, SrO, and BaO), ZnO, Al ２ O ３ , and at least one selected from the group consisting of ZrO ２ is preferred.

[0042] As the glass composition, more specifically, SiO ２ -B ２ O ３ -Na ２ O system, SiO ２ -Al ２ O ３ -B ２ O ３ -Na ２ O system, SiO ２ -Al ２ O ３ -B ２ O ３ -CaO-MgO system, SiO ２ -Al ２ O ３ -B ２ O ３ -Na ２ O-K ２ O-CaO-MgO system, SiO ２ -Al ２ O ３ -B ２ O ３ -Li ２ O-Na ２ O-MgO system, SiO ２ -Al ２ O ３ -B ２ O ３ -Li ２ O-Na ２ O-CaO system, SiO ２ -Al ２ O ３ -B ２ O ３ -Na ２ O-K ２ O-CaO-ZrO ２ system, SiO ２ -B ２ O ３ -CaO-MgO-Al ２ O３ -TiO ２ , and SiO ２ - Al ２ O ３ -B ２ O ３ -MgO-CaO-BaO-Na ２ Examples include O-based glass compositions. Furthermore, other, more specific glass compositions include SiO ２ -MgO-Na ２ O-P ２ O ５ system, SiO ２ -MgO-BaO-Na ２ O-P ２ O ５ system, SiO ２ - Al ２ O ３ -B ２ O ３ -MgO- (CaO, SrO, BaO) system, SiO ２ - Al ２ O ３ -B ２ O ３ -MgO-(CaO, SrO, BaO)-Na ２ O-P ２ O ５ System, and SiO ２ - Al ２ O ３ -B ２ O ３ -Na ２ O-P ２ O ５ system, SiO ２ - Al ２ O ３ -B ２ O ３ -MgO series, P ２ O ５ - Al ２ O ３ -B ２ O ３ -BaO-ZnO-SnF ２ Systems and other related fields can also be mentioned.

[0043] Furthermore, the components included in the above composition are not limited to those described in the above system, and may include other components as additives. Examples of additives include Al ２ O３ Na ２ O, P ２ O ５ , ZrO ２ , TiO ２ , B ２ O ３ _K ２ O, Nb ２ O ５ ZnO, alkaline earth components (MgO, CaO, BaO, and SrO, etc.), and rare earth components (La ２ O ３ , and Gd ２ O ３ Examples include SiO. The properties of the phase-splitting glass can be adjusted by adding components. In particular, the phase-splitting glass according to the embodiment of the present invention is SiO ２ , B ２ O ３ , and Na ２ Preferably contains O, SiO ２ Al ２ O ３ , B ２ O ３ , and Na ２ It is more preferable to include O, and SiO ２ Al ２ O ３ , B ２ O ３ , and Na ２ It is even more preferable that it contains O and at least one component selected from the group consisting of CaO, BaO, and SrO.

[0044] SiO in phase-separated glass according to an embodiment of the present invention ２ The content of is preferably 45.0 to 80.0% in mole percentage based on oxides. SiO in phase-separated glass according to an embodiment of the present invention ２ The content of is preferably 45.0% or more, and more preferably 50.0% or more, in mole percentage based on oxides. Within the above range, the chemical durability of the glass tends to improve. SiO in phase-separated glass according to an embodiment of the present invention ２The content of is preferably 80.0% or less, more preferably 78.0% or less, even more preferably 76.0% or less, and so on, in order: 75.0% or less, 74.0% or less, 73.0% or less, 72.0% or less, 71.0% or less, 70.0% or less, 69.0% or less, 68.0% or less, 67.0% or less, 66.0% or less, 65.0% or less, 64.0% or less, 63.0% or less, 62.0% or less, 61.0% or less, and 60.0% or less. Within the above ranges, the viscosity of the glass during melting tends to decrease, improving manufacturability and making it easier to obtain large phase-separated glass.

[0045] The following describes preferred examples of the composition of the phase-splitting glass according to the present invention, but the composition of the phase-splitting glass according to the present invention is not limited to the following compositions.

[0046] The phase-separating glass according to the embodiment of the present invention is SiO ２ , B ２ O ３ , and preferably containing alkali metal oxides. Hereinafter, SiO ２ , B ２ O ３ The composition containing alkali metal oxides is also referred to as the "first preferred composition." In the embodiment of the present invention, the phase-splitting glass, in the first preferred composition described above, contains, in mole percentage based on oxides, SiO ２ The content is 45.0-80.0%, B ２ O ３ Preferably, the content of is 15.0 to 35.0%, and the total content of alkali metal oxides is 3.0 to 12.0%.

[0047] In the first preferred composition described above, SiO ２ The content of is preferably 45.0 to 80.0% in mole percentage based on oxide. In the above first preferred composition, SiO ２ The content of is preferably 45.0% or more, and more preferably 50.0% or more, in mole percentage based on oxide. Within the above range, the chemical durability of the phase-separated glass tends to improve. In addition, in the above first preferred composition, SiO ２The content of is preferably 80.0% or less, more preferably 78.0% or less, even more preferably 76.0% or less, and so on, in order: 75.0% or less, 74.0% or less, 73.0% or less, 72.0% or less, 71.0% or less, 70.0% or less, 69.0% or less, 68.0% or less, 67.0% or less, 66.0% or less, 65.0% or less, 64.0% or less, 63.0% or less, 62.0% or less, 61.0% or less, and 60.0% or less. Within the above ranges, the viscosity of the glass during melting tends to decrease, improving manufacturability and making it easier to obtain large phase-separated glass.

[0048] In the first preferred composition described above, B ２ O ３ The content of is preferably 15.0 to 35.0% in mole percentage based on oxides. In the above first preferred composition, B ２ O ３ The content of is preferably 15.0% or more, and more preferably 20.0% or more, in mole percentage based on oxide. Within the above range, it is easier to obtain phase-splitting glass with desired properties, that is, it is easier to satisfy the desired optical properties in terms of light scattering properties and infrared transmittance. Furthermore, in the above first preferred composition, B ２ O ３ The content is preferably 35.0% or less, and more preferably 30.0% or less, in terms of molar percentage based on oxides. Within this range, the chemical durability of the phase-separated glass tends to improve.

[0049] In the first preferred composition described above, the alkali metal oxide content (total content) is preferably 3.0 to 12.0% in molar percentage based on oxide. In the first preferred composition described above, the alkali metal oxide content (total content) is preferably 3.0% or more, and more preferably 5.0% or more, in molar percentage based on oxide. Within this range, the meltability of the glass is improved, making it easier to manufacture phase-separated glass. Furthermore, in the first preferred composition described above, the alkali metal oxide content (total content) is preferably 12.0% or less, and more preferably 10.0% or less, in molar percentage based on oxide. Within this range, the chemical durability of the phase-separated glass tends to improve.

[0050] The phase-separating glass according to the embodiment of the present invention is SiO ２ , P ２ O ５ MgO, BaO, and Na ２ It is also preferable to include O. Hereinafter, SiO ２ , P ２ O ５ MgO, BaO, and Na ２ A composition containing O is also called the "second preferred composition." In the embodiment of the present invention, the phase-separated glass, in the above second preferred composition, contains, in mole percentage on an oxide basis, SiO ２ The content of is 45.0-85.0%, the content of MgO is 13.0-30.0%, and P ２ O ５ The content of is 0.5 to 10.0%, the BaO content is 0.5 to 30.0%, and Na ２ The O content is 0.1 to 30.0%, and Al ２ O ３ The content of is preferably 0.0 to 3.0%.

[0051] In the second preferred composition described above, SiO ２ The content of is preferably 45.0 to 85.0% in mole percentage based on oxide. In the above second preferred composition, SiO ２ The content of is preferably 45.0% or more in mole percentage based on oxides, and in order below, 50.0% or more, 55.0% or more, 60.0% or more, 65.0% or more, 66.0% or more, 67.0% or more, 68.0% or more, 69.0% or more, and 70.0% or more are preferred. Within the above range, the chemical durability of the phase-separated glass tends to improve. In addition, in the above second preferred composition, SiO ２ The content may be 85.0% or less in mole percentage based on oxides, preferably 80.0% or less, more preferably 78.0% or less, even more preferably 76.0% or less, and so on, with 75.0% or less, 74.0% or less, 73.0% or less, and 72.0% or less being preferred in that order. Within the above range, the viscosity of the glass during melting tends to decrease, improving manufacturability and making it easier to obtain large phase-separated glass.

[0052] In the second preferred composition described above, P ２ O ５ The content of is preferably 0.5 to 10.0% in mole percentage based on oxides. In the second preferred composition described above, P ２ O ５ The content of is preferably 0.5% or more in mole percentage based on oxides, and more preferably 0.6% or more, 0.7% or more, 0.8% or more, 0.9% or more, and 1.0% or more, in that order. Furthermore, in the above second preferred composition, P ２ O ５ The content of is preferably 10.0% or less in mole percentage based on oxide, and more preferably 9.0% or less, 8.0% or less, 7.0% or less, 6.0% or less, 5.0% or less, 4.0% or less, 3.0% or less, 2.0% or less, 1.9% or less, 1.8% or less, 1.7% or less, 1.6% or less, and 1.5% or less, in that order. Within the above range, the phase separation state is easier to control, and it becomes easier to obtain phase-separated glass with the desired optical properties.

[0053] In the second preferred composition described above, the MgO content is preferably 13.0 to 30.0% in mole percentage based on oxide. In the second preferred composition described above, the MgO content is preferably 13.0% or more, more preferably 14.0% or more, and even more preferably 15.0% or more, in mole percentage based on oxide. Within this range, it is easier to obtain phase-separated glass with the desired properties and to better satisfy the desired optical properties. Furthermore, in the second preferred composition described above, the MgO content is preferably 30.0% or less, more preferably 26.0% or less, even more preferably 24.0% or less, and particularly preferably 22.0% or less, in mole percentage based on oxide. Within this range, it is easier to obtain phase-separated glass with the desired properties and to better satisfy the desired optical properties.

[0054] In the above second preferred composition, the content of BaO is preferably 0.5 to 30.0% in terms of mole percentage based on oxides. In the above second preferred composition, the content of BaO is preferably 0.5% or more in terms of mole percentage based on oxides, and in order, 1.0% or more, 1.5% or more, 2.0% or more, 2.5% or more, 3.0% or more, 3.5% or more, 4.0% or more are preferable. Since BaO is a component that easily increases the refractive index, within the above range, it is easy to adjust the light scattering characteristics. Also, in the above second preferred composition, the content of BaO is preferably 30.0% or less in terms of mole percentage based on oxides, more preferably 20.0% or less, still more preferably 15.0% or less, particularly preferably 10.0% or less, and in order, it may be 8.0% or less, 7.0% or less, 6.0% or less, 5.0% or less, 4.0% or less. When within the above range, it is easy to obtain a phase-separated glass with desired properties and more easily satisfy the desired optical properties.

[0055] In the above second preferred composition, Na ２ The content of O is preferably 0.1 to 30.0% in terms of mole percentage based on oxides. In the above second preferred composition, the content of Na ２ The content of O is preferably 0.1% or more in terms of mole percentage based on oxides, more preferably 1.0% or more, still more preferably 2.0% or more, particularly preferably 3.0% or more, and most preferably 4.0% or more. When within the above range, the melting property of the glass is improved and it becomes easier to manufacture a phase-separated glass. Also, in the above preferred composition, the content of Na ２ The content of O is preferably 30.0% or less in terms of mole percentage based on oxides, more preferably 20.0% or less, still more preferably 15.0% or less, and particularly preferably 10.0% or less.

[0056] The above second preferred composition may contain Al ２ O ３ , and the content of Al ２ O ３ may be 0.0 to 3.0% in terms of mole percentage based on oxides. In the above second preferred composition, the content of Al ２ O ３The content of is preferably 0.0% or more, more preferably 0.1% or more, even more preferably 0.5% or more, and particularly preferably 1.0% or more, expressed as a mole percentage based on oxide. Within the above range, the chemical durability of the glass tends to improve. In addition, in the above preferred composition, Al ２ O ３ The content of is preferably 3.0% or less, more preferably 2.5% or less, even more preferably 2.0% or less, and particularly preferably 1.5% or less, expressed as a mole percentage based on oxide. Within the above range, it becomes easier to obtain phase-splitting glass with the desired optical properties by heat treatment or the like.

[0057] Spinodal decomposition refers to the phenomenon in which, when a mixture of a predetermined composition is placed at a predetermined temperature, slight concentration fluctuations spontaneously amplify, leading to phase separation (phase splitting). Binodal decomposition, on the other hand, refers to the phenomenon in which, when a mixture of a predetermined composition is placed at a predetermined temperature, phase separation (phase splitting) accompanied by nucleation and nucleation growth occurs. Generally, the phase structure formed by spinodal decomposition has a structure in which the two separated phases are continuously intertwined with each other. Figure 1 shows a schematic cross-sectional view of the phase structure formed by spinodal decomposition. In Figure 1, the glass phase S1 shown in diagonal shades and the glass phase S2 shown in white are glass phases formed by spinodal decomposition, respectively. Specifically, in the embodiment shown in Figure 1, the glass phase S1 contains alkali metal oxide and B ２ O ３ It contains more SiO in the glass phase S2. ２ It contains more of this. The components contained in glass phase S1 and glass phase S2 differ depending on the components contained in the glass base material, which will be described later.

[0058] Furthermore, generally, the phase structure formed by binodal decomposition has a structure in which particulate phases and matrix phases are observed. Figure 2 shows a schematic cross-sectional view of the phase structure formed by binodal decomposition. In Figure 2, the particulate glass phase B1, shown in hatched colors, is dispersed in the glass phase B2 on the matrix, shown in white, and both glass phase B1 and glass phase B2 are glass phases formed by binodal decomposition.

[0059] A phase-separated glass according to an embodiment of the present invention is obtained, for example, by mixing raw materials to the above composition and heating them to obtain a uniform glass base material, and then performing a phase-separation treatment on the glass base material. Typical examples of the phase-separation treatment include heat treatment at a predetermined temperature. Since the phase structure formed changes depending on the heat treatment temperature and heat treatment time, it is preferable to select heating conditions so that a desired phase structure can be obtained. In other words, by adjusting the heat treatment temperature and heat treatment time, a desired phase structure can be obtained, and as a result, a phase-separated glass having the desired optical properties can be obtained. By adjusting the heat treatment temperature, the phase morphology can be mainly changed, while by adjusting the heat treatment time, the size of the phase structure can be adjusted. Furthermore, within a predetermined temperature range, by adjusting the heat treatment temperature, the size of the phase structure can be adjusted. Specifically, the higher the heat treatment temperature or the longer the heat treatment time, the larger the average width of the phase structure can be obtained in the phase-separated glass.

[0060] Furthermore, while changes in heat treatment temperature can strongly affect the phase separation morphology and the size of the phase separation structure, the heat treatment time has little effect on the size of the phase separation structure. Therefore, from the viewpoint of obtaining desired optical properties, the size of the phase separation structure can be roughly adjusted by adjusting the heat treatment temperature, and precise control can be achieved by adjusting the heat treatment time. The heat treatment temperature mentioned above is 50°C or more higher than the glass transition temperature or annealing temperature, and is preferably 80°C or more higher. The upper limit of the heat treatment temperature mentioned above is 400°C higher than the glass transition temperature or annealing temperature, and is preferably 300°C higher. The heat treatment time mentioned above is preferably 10 minutes or more, more preferably 1 hour or more, and even more preferably 2 hours or more. The heat treatment time mentioned above is preferably 200 hours or less, more preferably 100 hours or less, even more preferably 64 hours or less, and particularly preferably 32 hours or less. From the viewpoint of mass production, it is particularly preferably 24 hours or less, and especially preferably 12 hours or less. For example, it is preferable to set the heat treatment temperature in the range of 400 to 900°C and the heat treatment time in the range of 10 minutes to 200 hours (preferably 10 minutes to 100 hours). In particular, the above conditions are preferred for the preferred compositions described above. When manufacturing the glass base material, if phase separation occurs at the melt stage during the melting of the glass raw materials, the obtained glass base material may be used as is as the phase-separated glass according to the embodiment of the present invention.

[0061] Furthermore, if the glass base material is a uniform glass that has not undergone phase separation, the refractive index of the glass base material at the d-line is preferably 1.40 to 2.50. The refractive index of the glass base material at the d-line is preferably 1.40 or higher, more preferably 1.45 or higher, and even more preferably 1.48 or higher, in terms of excellent scattering properties in the visible light region and superior design properties. In addition, the refractive index of the glass base material at the d-line is preferably 2.50 or lower, more preferably 2.30 or lower, and even more preferably 2.10 or lower, in terms of bringing the color of the reflected color closer to white.

[0062] <Laminate> The phase-splitting glass according to the embodiment of the present invention may be used as a laminate formed by laminating it with other components. Specifically, it is preferable to use it as a laminate having the phase-splitting glass according to the embodiment of the present invention and a visible light reflective film. Using it in the form of a laminate having the phase-splitting glass and a visible light reflective film is preferable because it exhibits a white color with a higher aesthetic appeal. The visible light reflective film refers to a film with a high average reflectance in the visible light region. More specifically, it refers to a film with an average reflectance of 10% or more in the visible light region. The average reflectance in the visible light region is measured using a spectrophotometer (Shimadzu Corporation: UV-Vis-NIR spectrophotometer "SolidSpec-3700i UV"). The measurement wavelength range is 400 to 1600 nm, and the measurement is performed with a 5° incidence.

[0063] The visible light reflective film described above is preferably composed of an inorganic material. Furthermore, it is more preferable that the visible light reflective film is a multilayer reflective film composed of an inorganic material. The inorganic material may be an oxide (for example, SiO ２ , ZrO ２ Al ２ O ３ , TiO ２ , Nb ２ O ５ , and, Ta ２ O ５ (e.g.), fluoride (for example, MF ２ , and CaF ２ Examples include inorganic materials (e.g., Al, Ag, and Au), and metals (e.g., Al, Ag, and Au). When the visible light reflective film is a multilayer reflective film, it is preferable that each layer constituting the multilayer reflective film contains multiple types of inorganic materials. That is, it is preferable that the multilayer reflective film contains two or more layers composed of different inorganic materials. The above visible light reflective film can be formed by known methods such as vacuum deposition. Furthermore, it is preferable that the visible light reflective film is formed directly on the surface of the phase-splitting glass.

[0064] Furthermore, when using the phase-splitting glass according to an embodiment of the present invention as a laminate formed by laminating it with other components, it is also preferable to use it as a laminate having the phase-splitting glass according to the embodiment of the present invention and a multilayer film composed of an inorganic material. Specific examples of the inorganic material are the same as those used in the visible light reflective film. It is preferable that each layer constituting the multilayer film composed of the inorganic material contains multiple types of inorganic materials. That is, it is preferable that the multilayer film includes two or more layers composed of different inorganic materials. The multilayer film composed of the inorganic material can be formed by known methods such as vacuum deposition. It is also preferable that the multilayer film composed of the inorganic material be formed directly on the surface of the phase-splitting glass. It is also preferable that the multilayer film composed of the inorganic material function as an anti-reflective film. That is, it is also preferable that the laminate has a phase-splitting glass according to an embodiment of the present invention and an anti-reflective film. The anti-reflective film refers to a film with a surface reflectance of 2% or less at a specific wavelength. The reflectance is measured using a spectrophotometer (Shimadzu Corporation: UV-Vis-NIR spectrophotometer "SolidSpec-3700i UV"). The measurement wavelength range is 400 to 1600 nm, and measurements are taken with a 5° incident angle.

[0065] The above laminate may have a visible light reflective film, a phase splitting glass, and an anti-reflective film in this order. In the above embodiment, it is preferable that the anti-reflective film has an anti-reflective function in at least one of the visible light region and the infrared light region. The above laminate may also have anti-reflective films on both sides of the phase splitting glass. In the above embodiment, it is preferable that the anti-reflective film has an anti-reflective function in the infrared light region. Furthermore, if the above laminate has a visible light reflective film, the visible light reflective film may also have an anti-reflective function. In the above embodiment, it is preferable that the visible light reflective film has an anti-reflective function in the infrared light region. Furthermore, if the above laminate has a visible light reflective film, it is preferable that the visible light reflective film is provided on one side of the phase splitting glass.

[0066] Furthermore, if the anti-reflective coating has anti-reflective properties in the visible light region, the whiteness tends to improve, leading to enhanced aesthetic appeal. Also, if the anti-reflective coating has anti-reflective properties in the infrared light region, the transmittance of infrared light tends to improve, leading to enhanced sensing accuracy and other improvements.

[0067] Furthermore, in the laminate described above, other components may be in forms other than those described above. For example, the phase-splitting glass according to the embodiment of the present invention may be used as a laminate having a known anti-reflective coating and the phase-splitting glass according to the embodiment of the present invention. Examples of the anti-reflective coating include a resin film having a structure in which the effective refractive index changes continuously in the film thickness direction (e.g., a moth-eye structure). Of course, other known anti-reflective coatings may also be applied.

[0068] <Applications> The phase-splitting glass according to the embodiment of the present invention is a novel glass having the above-described properties and is therefore suitably used as an infrared transmission filter. For example, the phase-splitting glass according to the embodiment of the present invention is suitably used as a cover member for an infrared sensor and as a cover member for a module including an infrared sensor. Furthermore, the phase-splitting glass according to the embodiment of the present invention may be used in a module including an infrared sensor and in the housing of a device incorporating the above module. When the phase-splitting glass according to the embodiment of the present invention is used as a cover member for an infrared sensor, infrared light is transmitted while preventing visible light from entering the infrared sensor, so the infrared sensor operates with high sensitivity. In addition, when imaging with the above infrared sensor, a clear image can be obtained because the haze in a predetermined wavelength range is low. The laminate according to the embodiment of the present invention is also suitably used for similar applications.

[0069] Furthermore, because the phase-splitting glass according to the embodiment of the present invention has the above-mentioned characteristics, it can be suitably applied to devices and the like that exhibit an aesthetically pleasing appearance. Specifically, when the phase-splitting glass according to the embodiment of the present invention is used in the housing of a device, even when an infrared sensor is placed on the underside of the phase-splitting glass, the shape and color of the infrared sensor can be concealed, providing a device equipped with an infrared sensor that has a uniform appearance.

[0070] The present invention will be described in more detail below based on examples. The materials, amounts used, proportions, processing content, and processing procedures shown in the following examples can be modified as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be interpreted as being limited by the following examples. Examples 3 to 5 and Examples 8 to 14 described later are examples, while Examples 1, 2, 6 and 7 are comparative examples.

[0071] <Manufacturing of phase-splitting glass> For Examples 1 to 6, SiO ２ Al ２ O ３ , B ２ O ３ MgO, CaCO2 ３ BaCO ３ , and Na ２ CO ３ Each of the raw materials was mixed to the content shown in the following molar percentage based on oxides. Composition: SiO ２ : 52.9%, Al ２ O ３ : 2.6%, B ２ O ３ : 22.6%, MgO: 7.9%, CaO: 6.5%, BaO: 0.9%, Na ２ O: 6.7% (SiO ２ - Al ２ O ３ -B ２ O ３ -MgO-CaO-BaO-Na ２ (Type O) The mixed glass raw materials were placed in a platinum crucible and heated to 1500°C in a resistance-heated electric furnace to melt them. Degassing and homogenization were performed for 4 hours to obtain molten glass. The obtained molten glass was poured into a mold and cooled from a temperature of glass transition temperature (Tg: 580°C) + 50°C at a rate of 1°C / min to room temperature (approximately 25°C) to obtain a glass block (glass base material).

[0072] For example 7, SiO ２ , P ２ O ５ Al ２ O ３ , B ２ O ３ , Ba(PO ４ ), SnO, SnF２ The raw materials for P and ZnO were mixed to the following molar percentages based on oxides. Composition: P ２ O ５ : 26.0%, Al ２ O ３ : 1.0%, B ２ O ３ : 1.0%, BaO: 21.0%, ZnO: 5.0%, ZnF ２ : 5%, SnF ２ : 41% (P ２ O ５ - Al ２ O ３ -B ２ O ３ -BaO-ZnO-SnF ２ (System) The mixed glass raw materials were placed in a carbon crucible and heated to 900°C in a resistance-heated electric furnace to melt them. After degassing and homogenization for 1 hour, molten glass was obtained. The obtained molten glass was poured into a mold, cooled to 230°C and held for 3 hours, and then cooled to room temperature (approximately 25°C) at a rate of 5°C / min to obtain a glass block (glass base material).

[0073] For Examples 1 to 6, the obtained glass blocks were heat-treated under the conditions shown in Table 1 below to obtain phase-separated glass (phase-separated glass 1 to 5). For Examples 4 and 5, the same phase-separated glass 4 was used, differing only in thickness. The obtained phase-separated glass was cut and ground, and both sides were mirror-finished to obtain plate-shaped phase-separated glass measuring 30 mm in length, 30 mm in width, and 0.5 mm or 1 mm in thickness. The obtained phase-separated glass was immersed in hydrochloric acid and observed by SEM, confirming that it possessed a phase-separated structure formed by spinodal decomposition. For Example 7, since the glass block was already phase-separated, no heat treatment was performed; instead, it was cut and ground, and both sides were mirror-finished to obtain plate-shaped phase-separated glass (phase-separated glass 6).

[0074]

[0075] Furthermore, for Examples 8 to 14, SiO ２ NaPO ３ MgO, BaCO ３ Na ２ CO ３ and Na２ SO ４ Each raw material was mixed so that its content, expressed as a molar percentage based on oxides, matched the composition shown in Table 3 below. The mixed glass raw materials were placed in a platinum crucible and heated to 1650°C in a resistance-heated electric furnace to melt them. Degassing and homogenization were performed for 3 hours to obtain molten glass. The obtained molten glass was poured into a mold and cooled from 730°C at a rate of 1°C / min to room temperature (approximately 25°C) to obtain a glass block (glass base material). Furthermore, in Examples 8 to 14, phase separation treatment was performed under the heat treatment conditions shown in Table 3 below to obtain phase-separated glass (phase-separated glass 7 to 12). Note that Examples 12 and 13 use the same phase-separated glass 11, differing only in plate thickness. The obtained phase-separated glass was cut and ground, and both sides were mirror-finished to obtain plate-shaped phase-separated glass with dimensions of 30 mm in length, 30 mm in width, and a plate thickness of 0.5 mm or 1 mm.

[0076] <Measurement> The obtained phase-splitting glass was subjected to various optical property measurements using the method described above. The equipment and conditions used were also as described above.

[0077] <Evaluation of Chemical Durability> The chemical durability of the obtained phase-splitting glass was evaluated under the following conditions. First, the obtained phase-splitting glass was processed into a 30 mm square, 0.5 mm thick plate to obtain a sample for measurement. The obtained sample for measurement was immersed in 650 mL of hydrochloric acid at a concentration of 1 mol / L and a temperature of 90°C for 16 hours. After that, the sample for measurement was removed from the hydrochloric acid and immersed in 650 mL of NaOH aqueous solution at a concentration of 0.1 mol / L and a temperature of 25°C for 4 hours. The sample for measurement was removed from the NaOH aqueous solution, washed with pure water, and dried to obtain the post-immersion sample. The sample for measurement before immersion in hydrochloric acid and the sample after immersion were compared and the change in appearance was evaluated. Furthermore, the mass (W) of the sample for measurement before immersion in hydrochloric acid was evaluated. １ (Unit: g), and sample after immersion (W ２ From the mass change rate (R) (unit: g) Ｗ The value obtained was in units of %). The rate of mass change is calculated using the following formula: R Ｗ = 100 × (W １ -W ２ ) / W １Based on the above changes in appearance and the mass change rate, chemical durability was evaluated according to the following criteria. The evaluation results are shown in Tables 2 and 3 below. A rating of A or B is preferred for chemical durability, with A being more preferred. A "-" in the chemical durability column indicates that the above chemical durability evaluation was not performed. • A: No significant change in the appearance and shape of the sample, and a mass change rate of less than 30% • B: No significant change in the appearance and shape of the sample, and a mass change rate of 30% or more • C: Significant changes in the appearance and shape of the sample (specifically, the sample after immersion does not retain the shape of the sample used for measurement, or cracks appear in the sample after immersion, etc.)

[0078] <Results> The results of the measurements and evaluations of the obtained phase-splitting glass are shown in Tables 2 and 3. The appearance color of the phase-splitting glass was determined by visual inspection. If the appearance color of the phase-splitting glass is white, it indicates that visible light is scattered and that it has superior design qualities.

[0079]

[0080]

[0081] As shown in Table 2, the phase splitting glasses of Examples 3 to 5 were confirmed to be novel phase splitting glasses with an average diffuse reflectance of 50.0% or more at wavelengths of 450 to 650 nm, a haze of 2.0% or less at 1350 nm, and a haze of 2.0% or less at 1600 nm. Furthermore, the phase splitting glasses of Examples 3 to 5 are expected to function as infrared transmission filters based on the principle described above. Because the average diffuse reflectance at wavelengths of 450 to 650 nm is 50.0% or more, they exhibit a white color with excellent aesthetic appeal.

[0082] Furthermore, as shown in Table 3, the phase splitting glasses of Examples 8 to 14 were confirmed to be novel phase splitting glasses with an average diffuse reflectance of 50.0% or more at wavelengths of 450 to 650 nm, a haze of 2.0% or less at 1350 nm, and a haze of 2.0% or less at 1600 nm. In addition, the phase splitting glasses of Examples 8 to 14 are expected to function as infrared transmission filters based on the principle described above. Because the average diffuse reflectance at wavelengths of 450 to 650 nm is 50.0% or more, they exhibit a white color with excellent aesthetic appeal. Furthermore, Examples 8 to 14 were confirmed to be phase splitting glasses with excellent chemical durability.

[0083] Although various embodiments have been described above, it goes without saying that the present invention is not limited to these examples. It is clear to those skilled in the art that various modifications and variations can be conceived, and these will naturally also fall within the technical scope of the present invention. Furthermore, the components in the above embodiments may be combined in any way without departing from the spirit of the invention.

[0084] This application is based on Japanese Patent Application No. 2025-010353 filed on January 24, 2025, and Japanese Patent Application No. 2025-085666 filed on May 22, 2025, the contents of which are incorporated by reference in this application.

[0085] S1, S2, B1, B2 glass phase Ws, Wb width of phase structure

Claims

1. Phase splitting glass having an average diffuse reflectance of 50.0% or more at wavelengths of 450-650 nm, a haze of 2.0% or less at a wavelength of 1350 nm, and a haze of 2.0% or less at a wavelength of 1600 nm.

2. The phase-splitting glass according to claim 1, wherein the straight-line transmittance at 1350 nm and 1600 nm is 80.0% or more.

3. The straight-line transmittance at a wavelength of 700 nm is T. ７００ The straight-line transmittance at a wavelength of 900 nm is defined as T ９００ In this case, S can be calculated using the following formula (1). ７００－９００ A phase-splitting glass according to claim 1 or 2, wherein the content is 0.14% / nm or more. (1) S ７００－９００ = (T ９００ -T ７００ ) / 200 In formula (1), T ７００ and T ９００ The unit is %.

4. The L value of the reflected light measured under the following conditions ＊ is 70.0 or more, the phase-separated glass according to claim 1 or 2. Conditions: - Measurement wavelength range: 360 to 740 nm - Light source for measurement: Pulsed xenon lamp - Illumination: Diffuse illumination - Light receiving optical system: Light reception in the 8° direction - Integrating sphere size: Φ152 mm - Observation light source: D65 light source - Measurement diameter: 3 mmφ 5. The phase-splitting glass according to claim 1 or 2, wherein in the Log differential pore volume distribution curve of the width of the phase structure in the phase-splitting glass, the average width of the phase structure based on volume is 70 to 145 nm.

6. In the Log differential pore volume distribution curve of the phase structure width, the width of the phase structure showing the maximum volume is W ｍｏｄｅ In that case, 0.6W ｍｏｄｅ ~1.4W ｍｏｄｅ The phase-separated glass according to claim 1 or 2, wherein the width of the phase-separated structure included in the range is 90% or more of the total volume.

7. In mole percentage based on oxides, SiO ２ The content of is 45.0-85.0%, the content of MgO is 13.0-30.0%, and P ２ O ５ The content of is 0.5 to 10.0%, the BaO content is 0.5 to 30.0%, and Na ２ The O content is 0.1 to 30.0%, and Al ２ O ３ The phase-splitting glass according to claim 1 or 2, wherein the content of is 0.0 to 3.0%.

8. In mole percentage based on oxides, SiO ２ The content is 45.0-80.0%, B ２ O ３ The phase-splitting glass according to claim 1 or 2, wherein the content of is 15.0 to 35.0%, and the total content of alkali metal oxides is 3.0 to 12.0%.

9. Phase-splitting glass according to claim 1 or 2, used as an infrared transmission filter.

10. A laminate comprising a phase-splitting glass according to claim 1 or 2 and a visible light reflective film.

11. A laminate comprising a phase-splitting glass according to claim 1 or 2 and a multilayer film composed of an inorganic material.

12. The laminate according to claim 10, wherein the visible light reflective film is a multilayer reflective film composed of inorganic materials.

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