Abstract: To provide an alkali-free glass substrate, which has a high Young's modulus, a low linear expansion coefficient, a high strain point and a low density, does not devitrify in the float forming process and is excellent in acid resistance. An alkali-free glass substrate, which contains neither alkali component nor BaO and consists essentially of, as represented by mol % based on oxide, from 57.0 to 65.0% of SiO2, from 10.0 to 12.0% of Al2O3, from 6.0 to 9.0% of B2O3, from 5.0 to 10.0% of MgO, from 5.0 to 10.0% of CaO and from 2.5 to 5.5% of SrO, provided that MgO+CaO+SrO is from 16.0 to 19.0%, MgO/(MgO+CaO+SrO)?0.40, and B2O3/(SiO2+Al2O3+B2O3)?0.12; wherein Young's modulus ?75 GPa; the linear expansion coefficient at from 50 to 350° C. is from 30×10?7/° C. to 40×10?7/° C.; the strain point ?640° C.; the temperature T2 (the viscosity ? satisfies log ?=2)?1,620° C.; the temperature T4 (the viscosity ? satisfies log ?=4)?1,245° C.; the devitrification temperature ?T4; and weight loss per unit area is at most 0.

Abstract: The present invention provides an image display device capable of displaying a good image by suppressing yellowing of a glass substrate, and a high-yield manufacturing method of the glass substrate. The image display device is formed of a front-side glass substrate and a back-side glass substrate. In this manufacturing method, a glass substrate is used as the front-side glass substrate when Sn++ content in the glass substrate is a predetermined value or less, and the glass substrate is used as the back-side glass substrate when the Sn++ content exceeds the predetermined value.

Abstract: The present invention provides a manufacturing method of a glass substrate for an image display device having high picture quality. The reducing force in a float furnace is controlled to be decreased so that Sn++ content on a surface of the glass substrate forming an Ag electrode is a predetermined value or less. When the resultant Sn++ content on the surface of the glass substrate forming the Ag electrode exceeds the predetermined value, the surface is partially removed to decrease the Sn++ content to the predetermined value or less to suppress the occurrence of yellowing of the glass substrate.

Abstract: The invention relates to a glass substrate whose chemical composition comprises the following components within limits defined thereafter and expressed in percentages by weight: 58-72% by weight SiO2, 0.8-3 by weight TiO2, 2-15 by weight B2O3, 10-25 by weight Al2O3, 5-12 by weight CaO, 0-3 by weight MgO, 0-6 by weight BaO, 0-4 by weight SrO, 0-3 by weight ZnO, and 0-1 by weight R2O.

Abstract: A colorant for a high redox glass composition comprising: total iron (Fe2O3) 0 to 1.1 weight percent; and from 0.0001 to 0.15 weight percent of at least one of the following: Cu nanostructures, Au nanostructures, or Ag nanostructures, wherein the weight percents are based on the total weight of the glass composition. The colorant of the invention can be used to make glass compositions having various colors.

Abstract: This invention relates to a method of making glass. In certain example embodiments, a major surface(s) of the glass is treated with aluminum chloride (e.g., AlCl3) at or just prior to the annealing lehr. The aluminum chloride treatment at or just prior to the annealing lehr, in either a float or patterned line glass making process, is advantageous in that it allows the treatment to be performed at a desirable glass temperature and permits exhaust functions in or proximate the annealing lehr to remove byproducts of the treatment in an efficient manner.

Abstract: An apparatus is disclosed comprising a first color glass feeder having a first valve device, and a second color glass feeder having a second valve device, each connected by communications links to a controller. The controller controls the first valve device and second valve device in order to provide molten glass of a first color and a second color, at a first and a second flow rate, respectively. The controller may be a computer. The controller may include an interactive device into which a first and a second flow rate value can be entered for controlling the first and second flow rates, respectively. The first and second color molten glasses may be incompletely mixed in a channel so that discrete portions of the molten glass of the first color and of the second color can be seen. The controller may also control a robotic mixing device.

Abstract: A glass substrate of the present invention for magnetic recording media having high heat resistance and easy chemical strengthening ability at once has not been obtained, which is a glass composition essentially comprising 60 to 70 wt % SiO2, 5 to 20 wt % Al2O3, 0 to 1 wt % Li2O, 3 to 18 wt % Na2O, 0 to 9 wt % K2O, 0 to 10 wt % MgO, 1 to 15 wt % CaO, 0 to 4.5 wt % SrO, 0 to 1 wt % BaO, 0 to 1 wt % TiO2 and 0 to 1 wt % ZrO2, wherein the sum of Li2O, Na2O and K2O is from 5 to 25 wt %, and the sum of MgO, CaO, SrO and BaO is from 5 to 20 wt %.

Abstract: A method for reducing the defect density of glass comprising melting a glass composition comprising from 65–75 wt. % of SiO2; from 10–20 wt. % of Na2O; from 5–15 wt. % of CaO; from 0–5 wt. % of MgO; from 0–5 wt. % of Al2O3; from 0–5 wt. % of K2O; from 0–2 wt. % Fe2O3; and from 0–2 % FeO, wherein the glass composition has a total field strength index of greater than or equal to 1.23 is disclosed.

Abstract: A process for the production of durable photocatalytically active self-cleaning coating on glass by contacting a hot glass surface with a fluid mixture of titanium chloride, a source of oxygen and a tin precursor. The coating preferably comprises less than 10 atom % tin in the bulk of the coating and preferably there is a greater atomic percent tin in the surface of the coating than there is in the bulk of the coating. Preferably, the coating is durable to abrasion and humidity cycling.

Abstract: A method is provided for forming a photoactive coating having a photoabsorption band in the visible region of the electromagnetic spectrum. The method includes depositing a precursor composition over at least a portion of a float glass ribbon in a molten metal bath by a CVD coating device. The precursor composition includes a titania precursor material and at least one other precursor material selected from chromium (Cr), vanadium (V), manganese (Mn), copper (Cu), iron (Fe), magnesium (Mg), scandium (Sc), yttrium (Y), niobium (Nb), molybdenum (Mo), ruthenium (Ru), tungsten (W), silver (Ag), lead (Pb), nickel (Ni), rhenium (Re), and mixtures thereof.

Abstract: A substrate for use as a disk substrate in a hard disk drive or the like, an information recording medium such as a magnetic disk, and a starting material glass plate which is a starting material of the substrate for information recording media. The forming conditions of the starting material glass plate are controlled such that the starting material glass plate has a long-wavelength waviness of not more than 6 nm. This starting material glass plate is polished so as to have a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.0l ?m and a 90% diameter of the volume grain size distribution of not less than 0.02 ?m. The resulting substrate for an information recording medium has an excellent planarity, can be obtained in a short time and with a low polishing amount, and the resulting information recording medium is able to cope with increased data zone recording density.

Abstract: A method is provided for making clear glass having an azure edge coloration and low amber surface coloration in a non-vacuum float glass system. The method includes processing batch materials in a non-vacuum float glass system to provide a final glass product including: SiO2 65-75 wt. %;? Na2O 10-20 wt. %;? CaO 5-15 wt. %;? MgO 0-5 wt. %; Al2O3 0-5 wt. %; K2O 0-5 wt. %; a colorant portion having total iron (Fe2O3) of 0-0.02 wt. %, CoO of 0-5 ppm, Nd2O3 of 0-0.1 wt. %, and CuO of 0-0.03 wt. %. The glass has a redox ratio in the range of 0.2 to 0.6, and can have a retained sulfur content of less than or equal to 0.2 wt. %, such as less than or equal to 0.11 wt. %.

Abstract: A float glass chamber and related methods comprising a hot section having an atmosphere in at least the lower plenum comprises less than 3 percent hydrogen based on volume and a cold section, wherein the boundary line between the hot section and the cold section is where the temperature of the glass falls below a threshold temperature

Abstract: A method for reducing the defect density of glass comprising melting a glass composition comprising from 65-75 wt. % of SiO2; from 10-20 wt. % of Na2O; from 5-15 wt. % of CaO; from 0-5 wt. % of MgO; from 0-5 wt. % of Al2O3; from 0-5 wt. % of K2O; from 0-2 wt. % Fe2O3; and from 0-2 % FeO, wherein the glass composition has a total field strength index of greater than or equal to 1.23 is disclosed.

Abstract: Photochromic float glass and methods of making the same are provided. In especially preferred forms, the present invention is embodied in float glass having a non-photochromic glass substrate layer and a photochromic layer fused onto the substrate layer. During production, layers of the photochromic and non-photochromic glass are brought into contact with under conditions which fuse the layers one to another.

Abstract: A heat-resistant pipe is arranged so as to traverse below a glass ribbon in a float bath of molten tin, and bubbles emanate from the heat-resistant pipe, thereby making the bottom surface (which is in contact with the tin) uneven. Alternatively, the bottom surface is made uneven with a roller for lifting the glass ribbon out of the float bath into an annealing furnace. In addition to these operations for making the glass surface uneven, a film can be applied to the top face of the glass ribbon (i.e. the surface that is not in contact with the tin) by CVD, supplying a mixed gas of raw material from coaters. Thus, the invention makes it possible to manufacture a glass sheet having an uneven surface efficiently, using a technique for processing the surface of a glass sheet that is suitable for a production line for float glass.

Abstract: A glass substrate of the present invention for magnetic recording media having high heat resistance and easy chemical strengthening ability at once has not been obtained, which is a glass composition essentially comprising 60 to 70 wt % SiO2, 5 to 20 wt % Al2O3, 0 to 1 wt % Li2O, 3 to 18 wt % Na2O, 0 to 9 wt % K2O, 0 to 10 wt % MgO, 1 to 15 wt % CaO, 0 to 4.5 wt % SrO, 0 to 1 wt % BaO, 0 to 1 wt % TiO2 and 0 to 1 wt % ZrO2, wherein the sum of Li2O, Na2O and K2O is from 5 to 25 wt %, and the sum of MgO, CaO, SrO and BaO is from 5 to 20 wt %.

Abstract: Glass is made from batch components having a source of ferrous iron to increase the starting amount of ferrous iron in the glass batch. The ferrous iron source is an iron silicate material, such as fayalite (2FeO.SiO2), iron garnet (3FeO.Fe2O3.3SiO2) magnesium-iron olivine (2(Mg,Fe)O.SiO2), grunerite (6FeO.8SiO2FeOH)2, actinolite (CaO.3(Mg,Fe)O.4SiO2) or iron rich anthophyllite ((Mg,Fe)O.SiO2). The presence of the ferrous iron source in the glass batch components decreases or eliminates the amount of coal and also leads to a glass article having a redox ratio greater than about 0.25.

Abstract: The present invention relates to a substrate for information recording media for use as a disk substrate in a hard disk drive or the like and a manufacturing method thereof, an information recording medium such as a magnetic disk, and a starting material glass plate for use as a starting material of the substrate for information recording media. By suitably controlling forming conditions of the starting material glass plate, the starting material glass plate can be manufactured so as to have a long-wavelength waviness of not more than 6 nm. By carrying out precision polishing on this starting material glass plate having a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.01 &mgr;m and a 90% diameter of the volume grain size distribution of not more than 0.02 &mgr;m, a substrate for information recording media having an excellent planarity can be obtained in a short time and with a low polishing amount.

Abstract: There is provided a method of manufacturing a glass substrate for magnetic disks, according to which circumferential direction texture can be formed without bringing about a drop in anisotropy, thus enabling coating with a magnetic recording layer having a large magnetic coercivity. In a texturing step, a tape is used while a diamond slurry is fed onto at least one main surface of a glass substrate member that has been processed into a substantially circular shape, thus forming a linear texture in a circumferential direction on the at least one main surface. In a chemical strengthening step, the mechanical strength of the glass substrate member is chemically strengthened to a level required of the glass substrate for magnetic disks. The texturing step is carried out after the chemical strengthening step.

Abstract: Provided are a method for producing a glass suitable for an information recording medium required to have high qualities, a process for the production of a glass substrate blank from the above glass and a process for the production of a glass substrate from the above blank. The method is for the production of a glass containing an alkali metal element by melting a glass material in a glass melting apparatus and uses, as said melting apparatus, a melting apparatus whose glass-contact portion is made of a material containing zirconium and containing substantially no alkali metal element. In the process for the production of a glass substrate blank, the glass obtained by the above method is press-molded or is subjected to a float process, and in the process for the production of a glass substrate, the above glass substrate blank is lapped and polished.

Abstract: A method of forming a photocatalytic coating includes depositing a precursor composition over at least a portion of a substrate surface by a coating device. The precursor composition includes a titania precursor material and at least one other precursor material having a metal selected from boron, strontium, zirconium, lead, barium, calcium, hafnium, lanthanum, and mixtures thereof. Sufficient other precursor material is added to the composition such that a molar ratio of the selected metal to titanium in the applied photocatalytic coating is in the range of about 0.001 to about 0.05.

Abstract: The present invention provides a method of producing patterned and/or textured glass by applying a material onto at least a portion of a glass substrate, e.g., a float glass ribbon, at or above a softening point of the material and/or the glass substrate. The material is configured to affect the surface of the glass substrate to scatter light rays. An apparatus of the invention for forming patterned glass in a float glass process includes an applicator extensible into and out of a float bath chamber above a molten metal bath. A glass article of the invention includes a first surface and a second surface spaced from the first surface. The second surface includes a patterned portion configured to scatter light rays.

Abstract: Processes for the production of a smooth translucent glass sheet comprise grinding at least one face of a clear glass sheet using a conventional abrasive such as sand. Preferably the clear glass sheet is a sheet of clear float glass. The process may be carried out using a conventional glass grinding and polishing facility operated in a manner that the ground sheet is ground but not polished. The product preferably has a satin finish and a roughness Ra of less than 5.0 &mgr;M and is sufficiently translucent as to be useful in privacy glazing. The ground glass products may have a haze value of from 80 to 90% and an Ra value of from 1.0 &mgr;M to 3.0 &mgr;M are believed to be novel.

Abstract: The present invention generally relates the recovery of energy from a glass facility, such as a glass manufacturing facility and/or a float glass facility. Various embodiments of the present invention incorporate an air separation unit with a glass facility whereby energy may be recovered, generated, and/or conserved. In various embodiments, energy is recovered, generated, and/or conserved through hot expansion, mass flow increase, more efficient fuel consumption and/or the like.

Abstract: A heat-resistant pipe is arranged so as to traverse below a glass ribbon in a float bath of molten tin, and bubbles emanate from the heat-resistant pipe, thereby making the bottom surface (which is in contact with the tin) uneven. Alternatively, the bottom surface is made uneven with a roller for lifting the glass ribbon out of the float bath into an annealing furnace. In addition to these operations for making the glass surface uneven, a film can be applied to the top face of the glass ribbon (i.e. the surface that is not in contact with the tin) by CVD, supplying a mixed gas of raw material from coaters. Thus, the invention makes it possible to manufacture a glass sheet having an uneven surface efficiently, using a technique for processing the surface of a glass sheet that is suitable for a production line for float glass.

Abstract: The invention is a method of retaining selenium in a lass containing selenium by including a manganese compound and not including nitrates or nitrites routinely used in the industry to retain selenium. Particularly, a preferred embodiment involves manufacturing a gray soda-lime-silica glass composition including selenium as a colorant, the components of the gray soda-lime-silica glass have colorants consisting essentially of: greater than 0.9 to 1.9 wt. % total iron oxide as Fe2O3; 0.10 to 1.00 wt. % manganese compound as MnO2; 0.0010 to 0.0060 wt. % selenium as Se; 0.002 to 0.025 wt. % cobalt oxide as Co, and 0 to 1.0 wt. % titanium oxide as TiO2 which are combined and melted to make the glass composition. The glass composition has at 4.0 mm. thickness: 10 to 55% light transmittance using Illuminant A, less than 25% ultra violet transmittance, and less than 50% infra red transmittance.

Abstract: Photochromic float glass and methods of making the same are provided. In especially preferred forms, the present invention is embodied in float glass having a non-photochromic glass substrate layer and a photochromic layer fused onto the substrate layer. During production, layers of the photochromic and non-photochromic glass are brought into contact with under conditions which fuse the layers one to another.

Abstract: A heat-resistant pipe is arranged so as to traverse below a glass ribbon in a float bath of molten tin, and bubbles emanate from the heat-resistant pipe, thereby making the bottom surface (which is in contact with the tin) uneven. Alternatively, the bottom surface is made uneven with a roller for lifting the glass ribbon out of the float bath into an annealing furnace. In addition to these operations for making the glass surface uneven, a film can be applied to the top face of the glass ribbon (i.e. the surface that is not in contact with the tin) by CVD, supplying a mixed gas of raw material from coaters. Thus, the invention makes it possible to manufacture a glass sheet having an uneven surface efficiently, using a technique for processing the surface of a glass sheet that is suitable for a production line for float glass.

Abstract: A process for producing a glass substrate for information recording media which comprises polishing one side of a float glass in a finish polishing step to remove a surface layer therefrom in a thickness of 5 &mgr;m or larger and keeping the one side of the float glass not substantially in contact with any jig in each of the processing steps other than the finish polishing step. The number of processing steps in glass substrate production is reduced by utilizing only one side of a float glass as a data recording side to thereby attain a reduced production cost and stable supply of glass substrates and thus contribute to the progress of an information-oriented society.

Abstract: The present invention provides a method for making a stain-resistant float glass and an apparatus for carrying out such a method. In keeping with this method, SO3 is applied to the upper surface of float glass in an amount efficacious to materially reduce staining of the upper surface of the glass. Optimally, SO3 gas can be applied directly onto the upper surface of the glass. An apparatus of the invention generally includes a downwardly open hood positioned above the upper surface of the glass and having walls defining an enclosure. SO3 gas (either as such or as a reactive mixture of SO2 gas and an oxygen-containing gas) is delivered through a delivery tube to the enclosure.

Abstract: A dark bronze soda-lime-silica glass composition having excellent ultra violet and infra red absorbing ability. The colorants of the glass composition consist essentially of: greater than 0.5% total iron oxide as Fe2O3 with a maximum of 1.5% Fe2O3, wherein the redox ratio of FeO/total Fe as Fe2O3, is less than 0.26; 0.10 to 1.00 wt. % manganese compound as MnO2; 0.0005 to 0.004 wt. % selenium as Se; up to 0.016 wt. % cobalt oxide as Co; the glass composition having, at 4.0 mm. thickness: 570-585 dominant wavelength, 5-30% purity of excitation, 20 to 65% light transmittance using Illuminant A (LTA), less than 35% ultra violet transmittance measured over 300-400 nm, and less than 46% infra red transmittance measured over 760-2120 nm. At 20-50% LTA, the excitation purity is 7-30%, while above 50% LTA, the excitation purity is 5-20%. This glass is particularly useful for architectural applications.

Abstract: The invention is a method of making silicate based glass compositions with phosphorus compounds included in the composition as spectral modifiers to impart desirable color and improved energy absorbance properties. The phosphorus compound is generally a metal phosphide which is added to the batch glass composition in amounts greater than 0.05 weight percent prior to melting. The composition and method result in a finished glass suitable for use in architectural and automotive glazings.

Abstract: The invention is a medium color gray soda-lime-silica glass composition having excellent ultra violet and infra red absorbing ability. The colorants of the glass composition consist essentially of: greater than 0.5 but less than 0.9 wt. % total iron oxide as Fe2O3; 0.1 to 1.0 wt. % manganese compound as MnO2; 0.0005 to 0.003 wt. % selenium as Se; 0.002 to 0.010 wt. % cobalt oxide as Co; up to 1.0 TiO2; the glass composition having, at 4.0 mm. thickness: 485-570 dominant wavelength, less than 5% purity of excitation, 35 to 60% light transmittance using Illuminant A, less than 40% ultra violet transmittance measured over 300-400 nm, and less than 45% infra red transmittance measured over 760-2120 nm.

Abstract: A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 20 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 31-57×10−7/° C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO2, at least 6% Al2O3, the Al2O3 being 6-14% in conjunction with 55-67% SiO2 and 16-23% in conjunction with 49-58% SiO2, SiO2+Al2O3>68%, 0-15% B2O3, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-18% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.