Selenium-free privacy glass

Abstract

This invention relates to privacy glass and an environmentally friendly method for producing it. In particular, this invention relates to privacy glass for use in vehicle windows, manufactured by an environmentally friendly float process.

Description

[Technical Field]

[0001] Cross-reference of related applications This application claims priority to U.S. Patent Application No. 18 / 737,035 filed on June 7, 2024, and also claims the benefit of U.S. Provisional Patent Application No. 63 / 471,780 filed on June 8, 2023, the entirety of which disclosures are incorporated herein by reference. [Background technology]

[0002] This invention relates to privacy glass and an environmentally friendly method for producing it. In particular, this invention relates to privacy glass for use in vehicle windows, manufactured by an environmentally friendly float process.

[0003] Description of related technologies The manufacture of privacy glass typically involves processes that release significant amounts of se into the atmosphere. Such emissions are dangerous to human health and, for this reason, are subject to federal regulations in the United States. Until now, privacy glass manufactured without the use of se has generally resulted in very dark glass compositions that block most visible light. For example, U.S. Patent No. 8,901,021B2 ("Shelestak") to Shelestak et al. teaches a glass composition containing less than 0.0003 weight percent se and enabling a visible light transmittance of 15 percent or less. Notably, Shelestak's glass composition does not conform to the "float" process, which involves cooling the glass by floating it in a pool of molten tin after it leaves the furnace. [Overview of the project]

[0004] The present invention relates to glass, and in one embodiment, the glass contains an appropriate amount of cobalt oxide (CoO) and is substantially free of Se and SnO2, and the glass has a thickness of 4.1 mm and a visible light transmittance (T) with a CIE standard illuminant "A" wavelength of 380 nm to 780 nm.LA The percentage is greater than 0 percent and less than or equal to 21 percent. Alternatively, in another embodiment, the present invention relates to glass, which not only has a suitable amount of cobalt oxide (CoO) in the glass but also contains a suitable amount of SnO2, and the glass has a glass thickness of 4.1 mm and the CIE standard illuminant "A" wavelength is 380 nm to 780 nm, T LA However, it is greater than 0 percent and less than or equal to 21 percent.

[0005] The present invention further relates to a method for producing glass, and in particular, in one embodiment, to a method for producing glass by providing a glass batch that has an appropriate amount of CoO in the glass batch and is substantially free of Se and SnO2, wherein the glass has a glass thickness of 4.1 mm and a CIE standard illuminant "A" wavelength of 380 nm to 780 nm, T LA However, it is greater than 0 percent and less than or equal to 21 percent. Alternatively, in another embodiment, the present invention further relates to a method for producing glass, and in particular to a method for producing glass by providing a glass batch that contains not only an appropriate amount of cobalt oxide (CoO) but also an appropriate amount of SnO2, wherein the glass has a glass thickness of 4.1 mm and a CIE standard illuminant "A" wavelength of 380 nm to 780 nm, T LA However, it is greater than 0 percent and less than or equal to 21 percent.

[0006] Further non-limiting embodiments or aspects are described and explained in the following clauses.

[0007] Clause 1: A glass comprising 66 to 75 weight percent of SiO2, 10 to 20 weight percent of Na2O, 5 to 15 weight percent of CaO, 0 to 5 weight percent of MgO, 0 to 5 weight percent of Al2O3, 0 to 3 weight percent of K2O, 0.04 to 0.09 weight percent of SO3, and 0.29 to 0.62 weight percent of total iron expressed as Fe2O3, wherein the glass substantially does not contain Se, and the glass has a glass thickness of 4.1 mm and, with respect to the CIE standard illuminant "A" and wavelengths from 380 nm to 780 nm, T LA is greater than 0 percent and 21 percent or less, said glass.

[0008] Clause 2: The glass according to Clause 1, further comprising a redox ratio of 0.61 or more and 0.84 or less.

[0009] Clause 3: The glass according to any one of Clauses 1 to 2, further comprising a redox ratio of 0.63 or more and 0.82 or less.

[0010] Clause 4: The glass according to any one of Clauses 1 to 3, further comprising 0.026 to 0.057 weight percent of CoO.

[0011] Clause 5: The glass according to any one of Clauses 1 to 4, further comprising 0.027 to 0.056 weight percent of CoO.

[0012] Clause 6: The glass according to any one of Clauses 1 to 5, comprising 0.20 to 0.51 weight percent of FeO.

[0013] Clause 7: The glass according to any one of Clauses 1 to 6, substantially not containing SnO2.

[0014] Clause 8: The glass according to any one of Clauses 1 to 7, having a T UV less than 47, less than 20, or further less than 10, and / or having a Te less than 23, less than 20, or further less than 16.

[0015] Clause 9: A method for producing glass using a conventional float-type non-vacuum glass system, comprising: melting a glass batch to provide a pool of molten glass; pouring the pool of molten glass onto a molten tin bath; controllingly cooling the molten glass and moving the molten glass on the surface of the molten tin bath while applying force to the molten glass, in order to provide glass of a desired thickness; and removing the glass from the molten tin bath, wherein the glass is 66-75 The glass contains, by weight percent, SiO2, 10-20 wt percent Na2O, 5-15 wt percent CaO, 0-5 wt percent MgO, 0-5 wt percent Al2O3, 0-3 wt percent K2O, 0.04-0.09 wt percent SO3, and 0.29-0.62 wt percent total iron expressed as Fe2O3, and the glass is substantially se-free, and the glass has a thickness of 4.1 mm, and the CIE standard illuminant "A" wavelength is 380 nm to 780 nm, T LA The method wherein the percentage is greater than 0 percent and less than or equal to 21 percent.

[0016] Clause 10: The method according to Clause 9, wherein the glass further comprises a redox ratio of 0.61 or more and 0.84 or less.

[0017] Clause 11: The method according to any one of Clauses 9 to 10, wherein the glass further comprises a redox ratio of 0.63 or more and 0.82 or less.

[0018] Clause 12: The method according to any of Clauses 9 to 11, wherein the glass further comprises 0.026 to 0.057 weight percent of CoO.

[0019] Clause 13: The method according to any of Clauses 9 to 12, wherein the glass further comprises 0.027 to 0.056 weight percent of CoO.

[0020] Clause 14: The method according to any of Clauses 9 to 13, wherein the glass further comprises 0.20 to 0.51 weight percent of FeO.

[0021] Clause 15: The glass batch contains 0.017 to 0.11 weight percent of coal and is prepared by the method described in any one of Clauses 9 to 14.

[0022] Clause 16: The glass batch contains 0.11 to 0.37 weight percent of pyrite (Fe2S) and is prepared by the method described in any one of Clauses 9 to 15.

[0023] Clause 17: The glass batch or the glass itself substantially does not contain SnO2 and is prepared by the method described in any one of Clauses 9 to 16.

[0024] Clause 18: The glass has a T less than 47, less than 20, or even less than 10, and / or has a Te less than 23, less than 20, or even less than 16, and is prepared by the method described in any one of Clauses 9 to 17. UV and / or has a Te less than 23, less than 20, or even less than 16, and is prepared by the method described in any one of Clauses 9 to 17.

[0025] Clause 19: The glass contains 66 to 75 weight percent of SiO2, 10 to 20 weight percent of Na2O, 5 to 15 weight percent of CaO, 0 to 5 weight percent of MgO, 0 to 5 weight percent of Al2O3, 0 to 3 weight percent of K2O, 0.043 to 0.081 weight percent of SO3, and 0.29 to 0.61 weight percent of total iron expressed as Fe2O3. The glass substantially does not contain Se. The glass has a thickness of 4.1 mm, and with respect to the CIE standard illuminant "A" wavelengths from 380 nm to 780 nm, T LA is greater than 0 percent and 21 percent or less, for the said glass.

[0026] Clause 20: The glass described in Clause 19 further contains a redox ratio of 0.61 or more and 0.84 or less.

[0027] Clause 21: The glass described in any one of Clauses 19 to 20 further contains a redox ratio of 0.63 or more and 0.82 or less.

[0028] Clause 22: Glass as described in any of Clauses 19-21, further comprising 0.027-0.056 weight percent of CoO.

[0029] Clause 23: Glass as described in any of Clauses 19-22, further comprising 0.027-0.056 weight percent of CoO.

[0030] Clause 24: Glass as described in any of Clauses 19-23, containing 0.21-0.50 weight percent of FeO.

[0031] Clause 25: The glass described in any of Clauses 19 to 24, which is substantially free of SnO2.

[0032] Clause 26: The glass has a T of less than 47, less than 20, or even less than 10. UV Glass as described in any of clauses 19 to 25, having and / or having Te less than 23, less than 20, or even less than 16.

[0033] Clause 27: A method for producing glass using a conventional float-type non-vacuum glass system, comprising: melting a glass batch to provide a pool of molten glass; pouring the pool of molten glass onto a molten tin bath; controllingly cooling the molten glass and moving the molten glass on the surface of the molten tin bath while applying force to the molten glass, in order to provide glass of a desired thickness, wherein the glass is 66-75 times thick. The glass contains a certain percentage of SiO2, 10-20 wt% Na2O, 5-15 wt% CaO, 0-5 wt% MgO, 0-5 wt% Al2O3, 0-3 wt% K2O, 0.043-0.081 wt% SO3, and 0.29-0.61 wt% total iron expressed as Fe2O3, and the glass is substantially se-free, and the glass has a thickness of 4.1 mm, and the CIE standard illuminant "A" wavelength is 380 nm to 780 nm, T LAThe method wherein the percentage is greater than 0 percent and less than or equal to 21 percent.

[0034] Clause 28: The method according to Clause 27, wherein the glass further comprises a redox ratio of 0.61 or more and 0.84 or less.

[0035] Clause 29: The method according to any one of Clauses 27 to 28, wherein the glass further comprises a redox ratio of 0.63 or more and 0.82 or less.

[0036] Clause 30: The method according to any of Clauses 27 to 29, wherein the glass further comprises 0.027 to 0.056 weight percent of CoO.

[0037] Clause 31: The method according to any of Clauses 27 to 30, wherein the glass further comprises 0.027 to 0.056 weight percent of CoO.

[0038] Clause 32: The method according to any one of Clauses 27 to 31, wherein the glass further comprises 0.21 to 0.50 weight percent of FeO.

[0039] Clause 33: The glass batch contains 0.018 to 0.11 weight percent coal, as described in any of Clauses 27 to 32.

[0040] Clause 34: The glass batch contains 0.11 to 0.36 weight percent of Fe2S, as described in any of Clauses 27 to 33.

[0041] Clause 35: The method according to any of Clauses 27 to 34, wherein the glass batch, or the glass itself, is substantially free of SnO2.

[0042] Clause 36: The glass has a T of less than 47, less than 20, or even less than 10. UV The method according to any of the clauses 27 to 35, having and / or having Te less than 23, less than 20, or even less than 16.

[0043] Clause 37: A glass comprising 66-75 weight percent SiO2, 10-20 weight percent Na2O, 5-15 weight percent CaO, 0-5 weight percent MgO, 0-5 weight percent Al2O3, 0-3 weight percent K2O, 0.044-0.080 weight percent SO3, and 0.30-0.60 weight percent total iron expressed as Fe2O3, wherein the glass is substantially Se-free, and the glass has a thickness of 4.1 mm and the CIE standard illuminant "A" wavelength is 380 nm-780 nm, T LA However, the glass is greater than 0 percent and less than or equal to 21 percent.

[0044] Clause 38: The glass described in Clause 37, further comprising a redox ratio of 0.63 or more and 0.82 or less.

[0045] Clause 39: Glass as described in any of Clauses 37-38, further comprising 0.027-0.056 weight percent of CoO.

[0046] Clause 40: Glass as described in any of Clauses 37-39, containing 0.21-0.50 weight percent of FeO.

[0047] Clause 41: The glass described in any of Clauses 37 to 40, which is substantially free of SnO2.

[0048] Clause 42: The glass has a T of less than 47, less than 20, or even less than 10. UV Glass according to any of the clauses 37 to 41, having and / or having Te less than 23, less than 20, or even less than 16.

[0049] Clause 43: A method for producing glass using a conventional float-type non-vacuum glass system, comprising: melting a glass batch to provide a pool of molten glass; pouring the pool of molten glass onto a molten tin bath; controllingly cooling the molten glass and moving the molten glass on the surface of the molten tin bath while applying force to the molten glass, in order to provide glass of a desired thickness, wherein the glass is 66-75 times thick. The glass contains a certain percentage of SiO2, 10-20 wt% Na2O, 5-15 wt% CaO, 0-5 wt% MgO, 0-5 wt% Al2O3, 0-3 wt% K2O, 0.044-0.080 wt% SO3, and 0.30-0.60 wt% total iron expressed as Fe2O3, and the glass is substantially se-free, and the glass has a thickness of 4.1 mm, and the CIE standard illuminant "A" wavelength is 380 nm to 780 nm, T LA The method wherein the percentage is greater than 0 percent and less than or equal to 21 percent.

[0050] Clause 44: The method according to Clause 43, wherein the glass further comprises a redox ratio of 0.63 or more and 0.82 or less.

[0051] Clause 45: The glass further comprises 0.027 to 0.056 weight percent of CoO, as described in any of Clauses 43 to 44.

[0052] Clause 46: The method according to any one of Clauses 43 to 45, wherein the glass further comprises 0.21 to 0.50 weight percent of FeO.

[0053] Clause 47: The glass batch contains 0.019 to 0.10 weight percent coal, as described in any of Clauses 43 to 46.

[0054] Clause 48: The glass batch contains 0.12 to 0.36 weight percent of Fe2S, as described in any of Clauses 43 to 47.

[0055] Clause 49: The method according to any of Clauses 43 to 48, wherein the glass batch, or the glass itself, is substantially free of SnO2.

[0056] Clause 50: The glass has a T of less than 47, less than 20, or even less than 10. UV The method according to any of the clauses 27 to 35, having and / or having Te less than 23, less than 20, or even less than 16. [Modes for carrying out the invention]

[0057] Unless otherwise indicated, all numbers used in this specification and in the claims, representing dimensions, physical properties, component amounts, reaction conditions, etc., should be understood in all cases to be modified by the term “approximately.” At a minimum, and not as an attempt to limit the application of principles equivalent to those in the claims, each numerical parameter should be interpreted in terms of the number of significant figures reported by applying ordinary rounding techniques. Furthermore, all ranges disclosed herein include the values ​​of the start and end ranges and encompass all sub-ranges contained therein. For example, a range described as “1 to 10” should be considered to include all sub-ranges (including 1 and 10) between the minimum value of 1 and the maximum value of 10.

[0058] Unless otherwise specified, all references to compositional amounts are “weight percentages” based on the total weight of the final glass composition. The “total iron” content of the glass compositions disclosed herein is expressed in terms of Fe2O3, regardless of the actual form it exists in, in accordance with standard analytical practice. Similarly, the amount of iron in the ferrous state is reported as FeO, even though it may not actually exist in the glass as FeO. The terms “redox,” “redox ratio,” or “iron redox ratio” mean the amount of iron in the ferrous state (expressed as FeO) divided by the amount of total iron (expressed as Fe2O3). The “sulfur” content of the glass compositions disclosed herein is expressed in terms of SO3, regardless of the actual form it exists in, in accordance with standard analytical practice.

[0059] As used herein, "substantially selenium-free" or "substantially Se-free" means that there is no amount of Se intentionally added to the glass, but there may be trace amounts of Se (i.e., 0 parts per million (ppm) to 2 ppm).

[0060] As used herein, “substantially tin oxide-free” or “substantially SnO2-free” means that tin oxide has not been intentionally added to the composition. For example, “substantially tin oxide-free” or “substantially SnO2-free” means that the batch components do not contain any detectable amount of tin oxide, and any tin oxide present in the final glass product is a result of the float glass process.

[0061] Where used herein, the value of “visible transmittance” is determined using a conventional CIE standard illuminant A and an instrument angle of 2 degrees. Those skilled in the art will understand that even if the actual thickness of the measured glass sample differs from the standard thickness, properties such as visible transmittance can be calculated for an equivalent standard thickness, e.g., 5.5 millimeters (mm).

[0062] All documents referenced herein, including but not limited to issued patents and patent applications, should be considered incorporated in their entirety by reference.

[0063] Iron exists in glass in two different oxidation states. That is, iron in the ferrous state (Fe 2+ Iron in the ferric state (FeO), and iron in the ferric state (Fe 3+ (It is represented as ferric oxide, Fe2O3). Each ion, Fe 2+ and Fe 3+ Fe gives the glass in which the ion is located different properties. 2+ It has a broad and strong absorption band centered at 1050 nm, which results in a low transmittance of infrared radiation (T IR This results in a decrease in Fe. Furthermore, this band extends into the visible region, which reduces the transmission of visible light and gives the glass a bluish tint. 3+ It has strong absorption in the ultraviolet region, and as a result, the transmittance of ultraviolet radiation (T UV ) will decrease. Furthermore, Fe 3+ It has two weak bands located in the visible light region of 420-440 nm, which results in a slight reduction in the transmission of visible light and gives the glass a yellowish tint.

[0064] The balance between ferrous and ferric oxide directly affects the color and transmittance properties of the glass.

number

[0065] The term "iron redox ratio" refers to the amount of iron in the ferrous state (represented as FeO) divided by the amount of total iron (represented as Fe2O3). This is because of the ferric ions (Fe) present in the glass. 3+ The greater the amount of ferrous ions (Fe2O3), the greater the absorption of ultraviolet radiation and the greater the transmission of light. Furthermore, the hue also becomes yellowish. However, as a result of the chemical reduction of Fe2O3, ferrous ions (Fe2O3) are produced. 2+When the content of ) increases, the absorption of infrared radiation increases, but ultraviolet radiation decreases, and even light transmittance decreases.

number

[0066] Changes in FeO concentration, associated with Fe2O3, cause changes in the color of the glass. The color transition can be altered from yellow through green and blue to amber. The blue-to-amber coloration of the glass is given by the formation of iron polysulfides under high redox conditions. The color changes as follows (based on experimental results): Yellow - Low redox (0.12) - High light transmittance (high ferric ions) Yellow-Green (0.16) Green-yellowish (0.20) Green (typical green glass value 0.25) Bluish-green (0.29) Greenish-blue (0.35) Blue (0.50) Olive Green (0.60) Champagne color (0.65) Amber - High redox (0.75) - Low light transmittance (low ferric ions)

[0067] As those skilled in the art will understand, controlling the redox of a glass composition is achieved by controlling the conditions under which the glass is manufactured. Many such factors can affect the redox. The concentrations of reducing agents (such as carbon) and oxidizing agents (such as sodium sulfate) can affect the redox, respectively. For example, sodium sulfate (Na2SO4) may be added as a raw material to a glass batch for bubble removal, high-temperature purification, promotion of mass transport, dissolution of free silica on the glass surface, and reduction of solid inclusions. However, since Na2SO4 has oxidizing properties, a small amount of carbon is usually added to the mixture to counteract undesirable oxidation. Furthermore, Na2SO4 is converted to SO3 during the glass manufacturing process, which has an inverse relationship with redox, while sulfur has a direct relationship with redox. Finally, melting conditions such as altering the oxygen excess and adjusting the flame arrangement during combustion in the furnace can further affect the redox.

[0068] As can be understood herein, the present invention relates to selenium-free privacy glass and methods for producing the same. The present invention is not limited to processes and / or equipment for carrying out the present invention to produce the glass of the present invention, but any glassmaking processes and / or equipment known in the art may be used to carry out the present invention.

[0069] In one aspect of the present invention, the present invention substantially contains no Se and includes 0.042 to 0.082 weight percent of SO3, 0.043 to 0.081 weight percent of SO3, or even 0.044 to 0.080 weight percent of SO3, with less than 21 percent of T LA Includes glass having [a specific characteristic]. Unlike prior art privacy glass, the present invention uses [a specific characteristic] necessary to maintain the privacy properties of the glass. LA Sulfur is used instead of Se without compromising the range.

[0070] In another embodiment, the present invention further comprises 0.0265 to 0.0563 weight percent of CoO, 0.0271 to 0.0557 weight percent of CoO, or even 0.0277 to 0.0551 weight percent of CoO. The addition of CoO is useful for neutralizing the color of the glass, as well as 0.5 to 21 percent of T LA It is useful for achieving the desired range.

[0071] In yet another embodiment, the present invention includes a method for controlling the amount of coal in a glass batch to be 0.017–0.102 weight percent, 0.018–0.101 weight percent, or even 0.019–0.10 weight percent.

[0072] According to the present invention, the following performance characteristics are measured as described below: Total solar ultraviolet transmittance (T UV ) is measured over the wavelength range of 300nm to 400nm using the ISO 13837 standard. Visible light transmittance is measured using the CIE standard illuminant "A" with a 2° observation instrument (T LA ) is measured over the wavelength range of 380nm to 780nm. Direct solar transmittance (Te) is measured over the wavelength range of 300nm to 2500nm using the ISO 13837 standard. Total solar infrared transmittance (T IR The total solar transmittance (T) is measured using the ISO 13837 standard over a wavelength range of 800 nm to 2500 nm. TS ) is measured using the ISO 13837 standard.

[0073] Color variable L from the CIELAB 1976 color system. * a * , and b * It is also calculated using tristimulus values.

[0074] Glass can be melted and refined in continuous, large-scale commercial glass melting processes. Furthermore, glass may be formed into flat glass sheets of various thicknesses by a float process, in which the molten glass is supported on a pool of molten metal (usually tin), while the molten glass takes on a ribbon shape and is cooled in a manner well known in the art.

[0075] As shown in Table 1 below, the following formulations represent non-limiting embodiments of the glass described herein. All examples demonstrate that the amount of titanium oxide (TiO2) present as an impurity is less than 0.02 percent. Examples 1-8 were produced using an electric furnace, and Examples 9-19 were produced using a gas furnace. [Table 1-1] [Table 1-2]

[0076] The non-limiting formulations in Table 2 below represent the basic batch components, colorants, and redox agents for producing one ton of glass. The amount of coal added to the glass batch can be intentionally varied across the examples. Specifically, 0.10 weight percent coal is added to the batch in Examples 1-4, 0.05 weight percent coal in Examples 5-8, 0.021 weight percent coal in Examples 9-11, and 0.019 weight percent coal in Examples 12-19. Again, Examples 1-8 were produced using an electric furnace, while Examples 9-19 were produced using a gas furnace. [Table 2]

[0077] The following are non-limiting examples of the glass compositions presented in Tables 1 and 2, reporting the physical properties of light transmission at a controlled thickness of 4.10 mm. Table 3 reports values ​​related to the various forms of light transmittance described in detail above. Table 4 reports the color transmittance values ​​related to the color of the glass, measured with a 10° instrument using the CIE standard illuminant "D65" according to the procedure established in ASTM E308, with respect to the dominant wavelength and stimulating purity. [Table 3-1] [Table 3-2] [Table 4-1] [Table 4-2]

[0078] The following are relevant to the various data presented in the table above: Tuv, ISO13837, air mass 1.5 300 a 400nm; Te, ISO13837 air mass 1.5 300 a 2500nm; T IR ISO13837 Air Mass 1.5 800 a 2500nm;T TS , ISO13837, v=4m / seg; and T LA CIE standard illuminant "A" 380 a 780nm.

[0079] It should be noted that in any of the examples contained herein, coal in batch chemistry can be replaced in a 1:1 ratio with any other suitable alternative carbon source, including but not limited to graphite. If this modification is made, no other modifications to the batch chemistry are required in any of the above examples. Furthermore, if an electric furnace is used to process the batch chemistry, the amount of coal or other carbon source should be appropriately adjusted in light of the fact that an electric furnace is in a different processing environment than a gas furnace. In a non-limiting example, since coal or other carbon source is considered a reducing agent, the amount of carbon used should be adjusted based on the composition of the atmosphere and / or the nature of the environment present in the furnace used to process the desired glass batch according to any of the embodiments of the present invention.

[0080] As is known in the art, glass recycling is an integral part of various types of glass manufacturing. Therefore, in some cases, the present invention may utilize one or more sources of glass cullet (i.e., recycled glass material). As is well known, there are two types of cullet: internal and external. Internal cullet consists of defective products detected and eliminated by quality control processes during the industrial process of glass manufacturing, transitional stages of product changes (such as changes in thickness and color), and manufacturing scraps, while external cullet is waste glass collected or reprocessed for recycling purposes. External cullet, which may be unused or used, may be classified as waste. In some embodiments, the present invention may utilize any suitable type of cullet, which may be internal or external cullet. When adding large quantities of external cullet to any of the batch chemistry detailed above, if such external cullet consists of more than 50 weight percent of visually clear glass rather than glass that appears visually green or bluish-green, the amount of Fe2S additive needs to be adjusted accordingly.

[0081] Therefore, taking the above into consideration, in one embodiment of the present invention, the glass composition comprises 66-75 weight percent SiO2, 10-20 weight percent Na2O, 5-15 weight percent CaO, 0-5 weight percent MgO, 0-5 weight percent Al2O3, 0-3 weight percent K2O, 0.042-0.082 weight percent SO3, and 0.292-0.611 weight percent total iron represented as Fe2O3, the glass is substantially Se-free, the glass has a thickness of 4.1 mm, and the CIE standard illuminant "A" wavelength is 380 nm to 780 nm, T LA However, it is greater than 0 percent and less than or equal to 21 percent. In one example, the glass of the present invention has a redox ratio of 0.617 to 0.835, or even more, a redox ratio of 0.633 to 0.819. In yet another example, the glass further contains 0.0265 to 0.0563 weight percent of CoO, or even more, 0.0277 to 0.0551 weight percent of CoO. In yet another example, the glass contains 0.205 to 0.501 weight percent of FeO. In yet another example, the glass is substantially free of SnO2. In yet another example, the glass has a T of less than 47, less than 20, or even less than 10. UV It has and / or has Te less than 23, less than 20, or even less than 16.

[0082] Therefore, taking the above into consideration, in one embodiment of the present invention, a method for producing glass using a conventional float-type non-vacuum glass system includes: melting a glass batch to provide a pool of molten glass; pouring the pool of molten glass onto a molten tin bath; controllingly cooling the molten glass and moving the molten glass on the surface of the molten tin bath while applying force to the molten glass to provide glass of a desired thickness; and removing the glass from the molten tin bath, wherein the glass is 66-7 The glass contains 5 wt percent SiO2, 10-20 wt percent Na2O, 5-15 wt percent CaO, 0-5 wt percent MgO, 0-5 wt percent Al2O3, 0-3 wt percent K2O, 0.042-0.082 wt percent SO3, and 0.292-0.611 wt percent total iron expressed as Fe2O3. The glass is substantially se-free, has a glass thickness of 4.1 mm, and is illuminated with CIE standard illuminant "A" wavelengths of 380 nm to 780 nm. LA However, it is greater than 0 percent and less than or equal to 21 percent. In one example, the glass has a redox ratio of 0.617 to 0.835, or even more, a redox ratio of 0.633 to 0.819. In yet another example, the glass further contains 0.0265 to 0.0563 weight percent of CoO, or even more, 0.0277 to 0.0551 weight percent of CoO. In yet another example, the glass contains 0.205 to 0.501 weight percent of FeO. In one example, the method of this embodiment utilizes a glass batch containing 0.017 to 0.102 weight percent of coal. In another example, the method of this embodiment utilizes a glass batch containing 0.112 to 0.361 weight percent of Fe2S. In yet another example, the glass batch or the glass itself is substantially free of SnO2. In yet another example, the glass of this method has a T of less than 47, less than 20, or even less than 10. UV It has and / or has Te less than 23, less than 20, or even less than 16.

[0083] Therefore, taking the above into consideration, in another embodiment of the present invention, the glass comprises 66-75 wt percent SiO2, 10-20 wt percent Na2O, 5-15 wt percent CaO, 0-5 wt percent MgO, 0-5 wt percent Al2O3, 0-3 wt percent K2O, 0.043-0.081 wt percent SO3, and 0.298-0.605 wt percent total iron represented as Fe2O3, the glass is substantially Se-free, the glass thickness is 4.1 mm, and the CIE standard illuminant "A" wavelength is 380 nm-780 nm, T LA However, it is greater than 0 percent and less than or equal to 21 percent. In one example, the glass of the present invention has a redox ratio of 0.625 to 0.827, or even more, a redox ratio of 0.633 to 0.819. In yet another example, the glass further contains 0.0271 to 0.0557 weight percent of CoO, or even more, 0.0277 to 0.0551 weight percent of CoO. In yet another example, the glass contains 0.210 to 0.496 weight percent of FeO. In yet another example, the glass is substantially free of SnO2. In yet another example, the glass has a T of less than 47, less than 20, or even less than 10. UV It has and / or has Te less than 23, less than 20, or even less than 16.

[0084] Therefore, in consideration of the above, in another embodiment of the present invention, a method for producing glass using a conventional float-type non-vacuum glass system includes: melting a glass batch to provide a pool of molten glass; pouring the pool of molten glass onto a molten tin bath; controllingly cooling the molten glass and moving the molten glass on the surface of the molten tin bath while applying force to the molten glass to provide glass of a desired thickness; and removing the glass from the molten tin bath, wherein the glass is 66~ The glass contains 75 wt percent SiO2, 10-20 wt percent Na2O, 5-15 wt percent CaO, 0-5 wt percent MgO, 0-5 wt percent Al2O3, 0-3 wt percent K2O, 0.043-0.081 wt percent SO3, and 0.298-0.605 wt percent total iron expressed as Fe2O3. The glass is substantially se-free, has a glass thickness of 4.1 mm, and is illuminated with CIE standard illuminant "A" wavelengths of 380 nm to 780 nm. LA However, it is greater than 0 percent and less than or equal to 21 percent. In one example, the glass has a redox ratio of 0.625 to 0.827, or even more, a redox ratio of 0.633 to 0.819. In yet another example, the glass contains 0.0271 to 0.0557 weight percent of CoO, or even more, 0.0277 to 0.0551 weight percent of CoO. In yet another example, the glass contains 0.210 to 0.496 weight percent of FeO. In one example, the method of this embodiment utilizes a glass batch containing 0.018 to 0.101 weight percent of coal. In another example, the method of this embodiment utilizes a glass batch containing 0.116 to 0.357 weight percent of Fe2S. In yet another example, the glass batch or the glass itself is substantially free of SnO2. In yet another example, the glass of this method has a T of less than 47, less than 20, or even less than 10. UV It has and / or has Te less than 23, less than 20, or even less than 16.

[0085] Therefore, taking the above into consideration, in another embodiment of the present invention, the glass comprises 66-75 wt percent SiO2, 10-20 wt percent Na2O, 5-15 wt percent CaO, 0-5 wt percent MgO, 0-5 wt percent Al2O3, 0-3 wt percent K2O, 0.044-0.080 wt percent SO3, and 0.304-0.599 wt percent total iron represented as Fe2O3, the glass is substantially Se-free, the glass thickness is 4.1 mm, and the CIE standard illuminant "A" wavelength is 380 nm-780 nm, T LA However, it is greater than 0 percent and less than or equal to 21 percent. In one example, the glass of the present invention has a redox ratio of 0.633 to 0.819. In yet another example, the glass further contains 0.0277 to 0.0551 weight percent of CoO. In yet another example, the glass contains 0.215 to 0.491 weight percent of FeO. In yet another example, the glass is substantially free of SnO2. In yet another example, the glass has a T of less than 47, less than 20, or even less than 10. UV It has and / or has Te less than 23, less than 20, or even less than 16.

[0086] In yet another embodiment, any of the glasses of the present invention further comprises 0.0158 to 0.0652 weight percent of TiO2, or 0.0164 to 0.0646 weight percent of TiO2, or even further 0.0170 to 0.0640 weight percent of TiO2. Furthermore, any of the glass compositions of the present invention further comprises 0 to 0.0013 weight percent of Cr2O3, or 0 to 0.0012 weight percent of Cr2O3, or even further 0 to 0.0011 weight percent of Cr2O3.

[0087] Therefore, in consideration of the above, in another embodiment of the present invention, a method for producing glass using a conventional float-type non-vacuum glass system includes: melting a glass batch to provide a pool of molten glass; pouring the pool of molten glass onto a molten tin bath; controllingly cooling the molten glass and moving the molten glass on the surface of the molten tin bath while applying force to the molten glass to provide glass of a desired thickness; and removing the glass from the molten tin bath, wherein the glass is 66~ The glass contains 75 wt percent SiO2, 10-20 wt percent Na2O, 5-15 wt percent CaO, 0-5 wt percent MgO, 0-5 wt percent Al2O3, 0-3 wt percent K2O, 0.044-0.080 wt percent SO3, and 0.304-0.599 wt percent total iron expressed as Fe2O3. The glass is substantially se-free, has a glass thickness of 4.1 mm, and is illuminated with CIE standard illuminant "A" wavelengths of 380 nm to 780 nm. LA However, it is greater than 0 percent and less than or equal to 21 percent. In one example, the glass has a redox ratio of 0.633 to 0.819. In yet another example, the glass further contains 0.0277 to 0.0551 weight percent of CoO. In yet another example, the glass contains 0.215 to 0.491 weight percent of FeO. In one example, the method of this embodiment utilizes a glass batch containing 0.019 to 0.1 weight percent of coal. In another example, the method of this embodiment utilizes a glass batch containing 0.12 to 0.353 weight percent of Fe2S. In yet another example, the glass batch or the glass itself is substantially free of SnO2. In yet another example, the glass of this method has a T of less than 47, less than 20, or even less than 10. UV It has and / or has Te less than 23, less than 20, or even less than 16.

[0088] In yet another embodiment, any method of producing glass using a conventional float-type non-vacuum glass system includes 0.0158–0.0652 weight percent of TiO2, or 0.0164–0.0646 weight percent of TiO2, or even 0.0170–0.0640 weight percent of TiO2. Furthermore, any method of producing glass using a conventional float-type non-vacuum glass system includes 0–0.0013 weight percent of Cr2O3, or 0–0.0012 weight percent of Cr2O3, or even 0–0.0011 weight percent of Cr2O3.

[0089] With respect to any numerical value disclosed herein, whether individual values ​​in one or more examples or individual values ​​from one or more parts of a numerical range, any of these individual numerical values ​​can be combined with any other numerical value of a similar nature. That is, any individual redox numerical value can be combined with any other different redox numerical value to result in a new, undisclosed range of redox numerical values. Furthermore, any individual numerical value from a given composition component, a given batch component, a given solar characteristic, or a further given color characteristic can be combined with any other different numerical values ​​from a given composition component, a given batch component, a given solar characteristic, or a further given color characteristic to result in a new, undisclosed range of numerical values ​​for one or more of the given composition components, a given batch component, a given solar characteristic, or a further given color characteristic.

[0090] Within the scope of the present invention, other modifications can be applied without departing from those described in the following claims to achieve the proposed properties of a selenium-free privacy glass composition. Therefore, the specific embodiments described in detail herein are illustrative and not limiting to the scope of the invention, which should encompass the entire scope of the appended claims and all their equivalents.

Claims

1. SiO ２ 66-75% by weight, Na ２ O 10-20% by weight, CaO 5-15 weight percent, MgO 0-5 weight percent, Al ２ O ３ 0-5% by weight, K ２ O 0-3 weight percent, SO ３ 0.04 to 0.09 weight percent, Fe ２ O ３ As total iron, 0.29 to 0.62 weight percent, Glass containing, The glass substantially does not contain Se, and the glass has a glass thickness of 4.1 mm. With a CIE standard illuminant "A" wavelength of 380 nm to 780 nm, the visible light transmittance ( ＬＡ "T") of the glass is greater than 0 percent and not more than 21 percent.

2. The glass according to claim 1, further comprising a redox ratio of 0.61 or more and 0.84 or less.

3. The glass according to claim 1 or 2, further comprising 0.026 to 0.057 weight percent of CoO.

4. The glass according to any one of claims 1 to 3, further comprising 0.20 to 0.51 weight percent of FeO.

5. The aforementioned glass is SnO ２ A glass according to any one of claims 1 to 4, which substantially does not contain.

6. The glass has a T of less than 47. ＵＶ A glass according to any one of claims 1 to 5, having the following characteristics.

7. The glass according to any one of claims 1 to 6, wherein the glass has a Te of less than 23.

8. SiO ２ 66-75% by weight, Na ２ O 10-20% by weight, CaO 5-15 weight percent, MgO 0-5 weight percent, Al ２ O ３ 0-5% by weight, K ２ O 0-3 weight percent, SO ３ 0.042 to 0.082 weight percent, Fe ２ O ３ As total iron, 0.29 to 0.62 weight percent, Glass containing, The glass is substantially free of Se, and the glass has a thickness of 4.1 mm, and the CIE standard illuminant "A" wavelength is 380 nm to 780 nm, T ＬＡ However, the glass has a percentage greater than 0 percent and less than or equal to 21 percent.

9. The glass according to claim 8, further comprising a redox ratio of 0.61 or more and 0.84 or less.

10. The glass according to claim 8 or 9, further comprising 0.026 to 0.057 weight percent of CoO.

11. The glass according to any one of claims 8 to 10, further comprising 0.20 to 0.51 weight percent of FeO.

12. The aforementioned glass is SnO ２ A glass according to any one of claims 8 to 11, which substantially does not contain.

13. The glass has a T of less than 47. ＵＶ A glass according to any one of claims 8 to 12, having the following characteristics.

14. The glass according to any one of claims 8 to 13, wherein the glass has a Te of less than 23.

15. A method for producing glass using a conventional float-type non-vacuum glass system, To provide a pool of molten glass, the glass batch is melted, Pouring the aforementioned pool of molten glass onto a molten tin bath, In order to provide glass of a desired thickness, the molten glass is cooled in a controllable manner, and while applying force to the molten glass, the molten glass is moved on the surface of the molten tin bath, Removing the glass from the molten tin bath, The glass includes, SiO ２ 66-75% by weight, Na ２ O 10-20% by weight, CaO 5-15 weight percent, MgO 0-5 weight percent, Al ２ O ３ 0-5% by weight, K ２ O 0-3 weight percent, SO ３ 0.042 to 0.082 weight percent, Fe ２ O ３ As total iron, 0.29 to 0.62 weight percent, Includes, The glass is substantially SnO ２ It does not include, The aforementioned glass has a thickness of 4.1 mm and, with the CIE standard illuminant "A" wavelength of 380 nm to 780 nm, has a visible light transmittance ("T"). ＬＡ The method wherein the percentage is greater than 0 percent and less than or equal to 21 percent.

16. The method according to claim 15, wherein the glass further comprises a redox ratio of 0.61 or more and 0.84 or less.

17. The method according to claim 15 or 16, wherein the glass further comprises 0.026 to 0.057 weight percent of CoO.

18. The method according to any one of claims 15 to 17, wherein the glass further comprises 0.20 to 0.51 weight percent of FeO.

19. The glass batch or glass composition is SnO ２ The method according to any one of claims 15 to 18, which substantially does not include

20. The glass has a T of less than 47. ＵＶ The method according to any one of claims 15 to 19, having the characteristics of

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