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WO2025226889A1 - Substrat en verre présentant un coefficient de dilatation thermique apte à réduire la déformation d'un stratifié, une recyclabilité améliorée et la capacité d'être formé par fusion, ensemble verre isolé l'incorporant, et procédé de fabrication associé - Google Patents

Substrat en verre présentant un coefficient de dilatation thermique apte à réduire la déformation d'un stratifié, une recyclabilité améliorée et la capacité d'être formé par fusion, ensemble verre isolé l'incorporant, et procédé de fabrication associé

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Publication number
WO2025226889A1
WO2025226889A1 PCT/US2025/026096 US2025026096W WO2025226889A1 WO 2025226889 A1 WO2025226889 A1 WO 2025226889A1 US 2025026096 W US2025026096 W US 2025026096W WO 2025226889 A1 WO2025226889 A1 WO 2025226889A1
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WO
WIPO (PCT)
Prior art keywords
range
glass
glass substrate
exhibits
composition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/US2025/026096
Other languages
English (en)
Inventor
James Gregory Couillard
Timothy James Kiczenski
Michelle Diane Pierson-Stull
Adama TANDIA
Kochuparambil Deenamma Vargheese
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Corning Inc
Original Assignee
Corning Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corning Inc filed Critical Corning Inc
Publication of WO2025226889A1 publication Critical patent/WO2025226889A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass

Definitions

  • the disclosure pertains to a glass substrate with an alkali aluminosilicate glass composition lacking B2O3 and exhibiting a coefficient of thermal expansion suitable for lamination with thicker soda lime glass, a relatively low density, and a liquidus viscosity and temperature at a viscosity of 200 Poise that make the glass substrate suitable for fusion forming processes.
  • Insulated glass units include a first pane of glass separated by a second pane of glass.
  • the second pane of glass is a laminate of two glass sheets.
  • the first pane of glass which is intended to be exposed to the external environment, is soda lime glass and is thermally tempered to increase resistance to damage from impact events (hail, birds, etc.).
  • the second pane of glass which is intended to be exposed to an interior environment, is sometimes a laminate of two relatively thick layers of soda lime glass.
  • Reasons for the laminate structure can be to prevent the second pane from shattering and falling to the ground upon an impact event (one layer, although shattered, remains stuck to the other layer) or to filter ultraviolet light, among other reasons.
  • the IGU can be relatively heavy. Heavy IGUs mean suboptimal shipping costs, as well as suboptimal manufacturing costs and environmental impact due to suboptimal use of raw materials. Thus, there are incentives to reduce the weight of the IGU. Reducing the weight of the glass layer of the laminate of the second pane facing the interior environment can be a target.
  • recyclers of soda lime glass generally forbid including glass that includes boron oxide (B2O3).
  • B2O3 boron oxide
  • the bow should be limited or non-existent. Specifically, it is desirable to minimize the bow because the presence of bow can complicate transport of the laminate by rollers, can induce undesirable stresses within the panes of the laminate that limit their strength, and/or can cause the IGU to show optical distortions.
  • modern IGUs can be quite wide but also quite thin, and manufacturing equipment and processes to make glass layers of such dimensions can be limited to glass compositions of a certain minimum viscosity in the molten state.
  • the present disclosure addresses that problem with a glass composition that lacks B2O3 but is otherwise formulated (i) to exhibit a liquidus viscosity and temperature at a viscosity of 200 Poise that render the glass composition suitable for fusion formation and therefore relatively thin, wide, and long glass substrates, (ii) with a coefficient of thermal expansion at lamination temperatures that resist generating a bow when a glass substrate of the glass composition is laminated to a thicker layer of soda lime glass, and (iii) with a density that is relatively low resulting in less product weight.
  • the following summary is a brief description of certain aspects of the present disclosure. The summary should not be considered as limiting of the breadth, scope, or applicability of the present disclosure.
  • a glass substrate comprises: a glass composition comprising (on an oxide basis and in mole percentage): SiCh, within a range of from 74.0 to 78.0; AI2O3, within a range of from 3.00 to 5.70; R2O, within a range of from 7.00 to 11.30; and R’O, within a range of from 5.70 to 13.90; wherein, R2O is the sum of Na2O and K2O, with Na2O being within a range of from 7.10 to 11.25 and K2O being within a range of from 0.005 to 6.7; wherein, R’O is the sum of MgO, CaO, SrO, and BaO, with MgO being within a range of from 2.50 to 8.30, CaO being within a range of from 0.01 to 4.20, SrO being within a range of from 0 to 5.20, and BaO being within a range of from 0 to 0.10; wherein, R2O + CaO + S
  • the glass substrate of any one of the first through second aspects is presented, wherein in the glass composition, R2O - AI2O3 - MgO - CaO is within a range of from -4.30 to 0.
  • the glass substrate of any one of the first through third aspects is presented, wherein the glass composition further comprises SnO2, Fe20s, TiO2, and Cl’.
  • the glass substrate of any one of the first through fourth aspects further comprises a thickness within a range of from 0.5 mm to 1.0 mm.
  • the glass substrate of any one of the first through fifth aspects further comprises: (i) a width that is greater than 90 cm; and (ii) a length that is greater than 100 cm.
  • the glass substrate of any one of the first through sixth aspects is presented, wherein the glass substrate exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 6.0 ppm/°C to 7.0 ppm/°C.
  • the glass substrate of any one of the first through seventh aspects is presented, wherein the glass substrate exhibits a liquidus viscosity that is greater than 150,000 Poise.
  • the glass substrate of any one of the first through eighth aspects is presented, wherein the glass substrate exhibits a viscosity of 200 Poise at a temperature of less than 1705 °C.
  • the glass substrate of any one of the first through ninth aspects is presented, wherein the glass substrate exhibits a density of less than 2.55 g/cm 3 .
  • a glass substrate comprises: a glass composition comprising (on an oxide basis, and in mole percentage): SiCh, within a range of from 72.0 to 78.5; AI2O3, within a range of from 1.70 to 9.20; R2O, within a range of from 5.30 to 11.60; and R’O, within a range of from 5.70 to 13.90; wherein, R2O is the sum of Na2O and K2O, with Na2O being within a range of from 2.80 to 11.60 and K2O being within a range of from 0.005 to 6.70; wherein, R’O is the sum of MgO, CaO, SrO, and BaO, with MgO being within a range of from 0.40 to 8.30, CaO being within a range of from 0.01 to 8.50, SrO being within a range of from 0 to 6.50, and BaO being within a range of from 0 to 0.10; and wherein, the glass composition is substantially free
  • the glass substrate of the eleventh aspect is presented, wherein in the glass composition, CaO / (R’O + ZnO) is within a range of from 0.004 to 0.620.
  • the glass substrate of any one of the eleventh through the twelfth aspects is presented, wherein in the glass composition, SrO / (R’O + ZnO) is within a range of from 0 to 0.37.
  • the glass substrate of any one of the eleventh through the thirteenth aspects is presented, wherein in the glass composition, (R’O + ZnO) / AI2O3 is within a range of from 1.00 to 4.00.
  • the glass substrate of any one of the eleventh through the fourteenth aspects is presented, wherein in the glass composition, R’O + ZnO is within a range of from 5.70 to 14.00.
  • the glass substrate of any one of the eleventh through the fifteenth aspects is presented, wherein the glass composition further comprises SnO2, Fe2O3, TiO2, and Cl’.
  • the glass substrate of any one of the eleventh through the sixteenth aspects is presented, wherein in the glass composition, Na2O is within a range of from 7 to 11.6.
  • the glass substrate of any one of the eleventh through the seventeenth aspects is presented, wherein in the glass composition, K2O is within a range of from 0.005 to 4.00.
  • the glass substrate of any one of the eleventh through the eighteenth aspects is presented, wherein the glass substrate exhibits a density of less than 2.60 g/cm 3 .
  • the glass substrate of any one of the eleventh through the nineteenth aspects is presented, wherein (i) in the glass composition SrO is within a range of from 0 to 6.00, and (ii) the glass substrate exhibits a density of less than 2.55 g/cm 3 .
  • the glass substrate of any one of the eleventh through the twentieth aspects is presented, wherein (i) in the glass composition, R’O is within a range of from 5.70 to 13.30; (ii) in the glass composition, SrO is within a range of from 0 to 3.60, and (iii) the glass substrate exhibits a density of less than 2.50 g/cm 3 .
  • the glass substrate of any one of the eleventh through the twenty-first aspects is presented, wherein (i) in the glass composition, CaO is within a range of from 2.50 to 8.20; (ii) in the glass composition, SrO is within a range of from 0 to 2.40, and (iii) the glass substrate exhibits a density of less than 2.45 g/cm 3 .
  • the glass substrate of any one of the eleventh through the twenty-second aspects is presented, wherein in the glass composition, SrO is within a range of from 0 to 1.20.
  • the glass substrate of any one of the eleventh through the twenty-third aspects is presented, wherein in the glass composition, AI2O3, is within a range of from 1.70 to 6.00.
  • the glass substrate of any one of the eleventh through the twenty-fourth aspects is presented, wherein the glass substrate exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 4.8 ppm/°C to 7.6 ppm/°C.
  • the glass substrate of any one of the eleventh through the twenty-fifth aspects is presented, wherein (i) in the glass composition, Na?O is within a range of from 7.10 to 11.25, and (ii) the glass substrate exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 6.0 ppm/°C to 7.0 ppm/°C.
  • the glass substrate of any one of the eleventh through the twenty-fifth aspects is presented, wherein (i) in the glass composition, R2O - AI2O3 - MgO - CaO is within a range of from -4.30 to 0, and (ii) the glass substrate exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 6.0 ppm/°C to 7.0 ppm/°C.
  • the glass substrate of any one of the eleventh through the twenty-seventh aspects is presented, wherein (i) in the glass composition, Na2O is within a range of from 7.20 to 9.90, and (ii) the glass substrate exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 6.0 ppm/°C to 6.5 ppm/°C.
  • the glass substrate of any one of the eleventh through the twenty-eighth aspects is presented, wherein the glass substrate exhibits a liquidus viscosity that is greater than 50,000 Poise.
  • the glass substrate of any one of the eleventh through the twenty-eighth aspects is presented, wherein the glass substrate exhibits a liquidus viscosity that is greater than 150,000 Poise.
  • the glass substrate of any one of the eleventh through the twenty-eighth aspects is presented, wherein the glass substrate exhibits a liquidus viscosity that is greater than 250,000 Poise.
  • the glass substrate of any one of the eleventh through the thirty-first aspects is presented, wherein the glass substrate exhibits a viscosity of 200 Poise at a temperature of less than 1725 °C.
  • the glass substrate of any one of the eleventh through the thirty-first aspects is presented, wherein the glass substrate exhibits a viscosity of 200 Poise at a temperature of less than 1650 °C.
  • the glass substrate of any one of the eleventh through the thirty-first aspects is presented, wherein the glass substrate exhibits a viscosity of 200 Poise at a temperature of less than 1630 °C.
  • the glass substrate of any one of the eleventh through the thirty-fourth aspects further comprises: a thickness within a range of from 0.5 mm to 1.0 mm.
  • the glass substrate of any one of the eleventh through the thirty-fifth aspects further comprises: (i) a width that is greater than 90 cm; and (ii) a length that is greater than 100 cm.
  • a glass substrate comprises: a glass composition comprising (on an oxide basis, and in mole percentage): SiCh, within a range of from 70.0 to 80.0; AI2O3, within a range of from 1.60 to 9.20; Na2O, within a range of from 2.80 to 12.50; MgO, within a range of from 0 to 10.00; CaO, within a range of from 0 to 8.50; SrO, within a range of from 0 to 8.00; ZnO, within a range of from 0 to 2.00; K2O, within a range of from 0 to 6.70; and SnCh, within a range of from 0 to 0.20; wherein, the glass substrate exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 5.5 ppm/°C to 7.0 ppm/°C, wherein, the glass substrate exhibits a density of less than 2.60 g/cm 3
  • the glass substrate of the thirty-seventh aspect is presented, wherein (i) the glass substrate exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 5.5 ppm/°C to 6.8 ppm/°C, (ii) the glass substrate exhibits a density of less than 2.50 g/cm 3 , (iii) the glass substrate exhibits a viscosity of 200 Poise at a temperature of less than 1650 °C, and (iv) wherein, the glass substrate exhibits a liquidus viscosity that is greater than 250,000 Poise.
  • the glass substrate of the thirty-seventh aspect is presented, wherein (i) in the glass composition, SiCh is within a range of from 73.0 to 78.0, (ii) in the glass composition, AI2O3 is within a range of from 3.00 to 6.00, (iii) in the glass composition, Na2O is within a range of from 8.00 to 11.50, (iv) in the glass composition, MgO is within a range of from 2.00 to 8.50, (v) in the glass composition, CaO is within a range of from 0 to 4.50, (vi) in the glass composition, SrO is within a range of from 0 to 5.00, (vii) in the glass composition, ZnO is within a range of from 0 to 1.00, (viii) in the glass composition, K2O is within a range of from 0 to 2.00, (ix) in the glass composition, SnCh is within a range of from 0 to 0.
  • the glass substrate of the thirty-ninth aspect is presented, wherein the glass substrate exhibits a liquidus viscosity that is greater than 400,000 Poise.
  • an insulated glass unit comprises: (a) a first pane; and (b) a second pane separated from the first pane by a space, the second pane comprising a laminate comprising a first glass layer and a second glass layer, the first glass layer comprising soda lime glass and the second glass layer comprising a glass composition comprising (on an oxide basis and in mole percentage): SiCh, within a range of from 70.0 to 80.0; AI2O3, within a range of from 1.60; to 9.20; Na2O, within a range of from 2.80 to 12.50; MgO, within a range of from 0 to 10.00; CaO, within a range of from 0 to 8.50; SrO, within a range of from 0 to 8.00; ZnO, within a range of from 0 to 2.00; K2O, within a range of from 0 to 6.70; and SnCh, within a range of from 0 to 0.20; where
  • the insulated glass unit of the forty-first aspect comprises: SiCh, within a range of from 72.0 to 78.5; AI2O3, within a range of from 1.70 to 9.20; R2O, within a range of from 5.30 to 11.60; and R’O, within a range of from 5.70 to 13.90; wherein, R2O is the sum of Na2O and K2O, with Na2O being within a range of from 2.80 to 11.60 and K2O being within a range of from 0.005 to 6.7; and wherein, R’O is the sum of MgO, CaO, SrO, and BaO, with MgO being within a range of from 0.40 to 8.30, CaO being within a range of from 0.01 to 8.50, SrO being within a range of from 0 to 6.50, and BaO being within a range of from 0 to 0.10.
  • the insulated glass unit of the forty-second aspect comprises: SiO2 is within a range of from 74.0 to 78.0; AI2O3 is within a range of from 3.00 to 5.70; R2O is within a range of from 7.00 to 11.30; R’O is within a range of from 5.70 to 13.90; Na2O is within a range of from 7.1 to 11.25; MgO is within a range of from 2.50 to 8.30; CaO is within a range of from 0.01 to 4.20; SrO is within a range of from 0 to 5.20; and R2O + CaO + SrO + BaO + ZnO - AI2O3 is within a range of from 8.70 to 11.64.
  • the insulated glass unit of any one of the forty-first through the forty-third aspects is presented, wherein the first pane comprises soda lime glass.
  • the insulated glass unit of any one of the forty-first through the forty-fourth aspects is presented, wherein (i) the first glass layer of the second pane comprises a thickness within a range of from 2.0 mm to 8.0 mm, and (ii) the first pane comprises a thickness within a range of from 2.0 mm to 8.0 mm.
  • the insulated glass unit of any one of the forty-first through the forty-fifth aspects is presented, wherein the second glass layer of the second pane comprises a thickness within a range of from 0.5 mm to 1.0 mm.
  • the insulated glass unit of any one of the forty-first through the forty-sixth aspects is presented, wherein the second glass layer of the second pane comprises: a width that is greater than 90 cm; and a length that is greater than 100 cm.
  • the insulated glass unit of any one of the forty-first through the forty-seventh aspects is presented, wherein the second glass layer of the second pane exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 6.0 ppm/°C to 7.0 ppm/°C.
  • the insulated glass unit of any one of the forty-first through the forty-eighth aspects is presented, wherein the second glass layer of the second pane exhibits a liquidus viscosity that is greater than 150,000 Poise.
  • the insulated glass unit of any one of the forty-first through the forty-ninth aspects is presented, wherein the second glass layer of the second pane exhibits a viscosity of 200 Poise at a temperature of less than 1725 °C.
  • the insulated glass unit of any one of the forty-first through the fiftieth aspects is presented, wherein the second glass layer of the second pane exhibits a density of less than 2.55 g/cm 3 .
  • a method of manufacturing a glass substrate comprises: a fusion forming step comprising causing a glass composition to flow in a molten state into a trough of an isopipe, overflow the through, and then flow over outer forming surfaces of the isopipe to converge at a root and form a glass ribbon; and a separating step comprising separating a glass substrate from the glass ribbon, wherein, the glass composition in the molten state comprises a temperature of less than 1705 °C, wherein, the glass composition in the molten state exhibits a viscosity that is greater than 50,000 Poise, and wherein, the glass composition comprises (on an oxide basis and in mole percentage): SiCh, within a range of from 70.0 to 80.0; AI2O3, within a range of from 1.60; to 9.20; Na2O, within a range of from 2.80 to 12.50; MgO, within a range of from 0 to 10.00; Ca
  • the method of the fifty- second aspect comprises (on an oxide basis and in mole percentage): SiCh, within a range of from 72.0 to 78.5; AI2O3, within a range of from 1.70 to 9.20; R2O, within a range of from 5.30 to 11.60; and R’O, within a range of from 5.70 to 13.90; wherein, R2O is the sum of Na20 and K2O, with Na20 being within a range of from 2.80 to 11.60 and K2O being within a range of from 0.005 to 6.7; and wherein, R’O is the sum of MgO, CaO, SrO, and BaO, with MgO being within a range of from 0.40 to 8.30, CaO being within a range of from 0.01 to 8.50, SrO being within a range of from 0 to 6.50, and BaO being within a range of from 0 to 0.10.
  • the method of the fifty- third aspect comprises (on an oxide basis and in mole percentage): SiO2, within a range of from 74.0 to 78.0; AI2O3, within a range of from 3.00 to 5.70; R2O, within a range of from 7.00 to 11.30; and R’O, within a range of from 5.70 to 13.90; wherein, R2O is the sum of Na2O and K2O, within Na2O being within a range of from 7.1 to 11.25 and K2O being greater than or equal to 0.005; wherein, R’O is the sum of MgO, CaO, SrO, and BaO, with MgO being within a range of from 2.50 to 8.30, CaO being within a range of from 0.01 to 4.20, SrO being within a range of from 0 to 5.20, and BaO being within a range of from 0 to 0.10; and wherein, R2O is the sum of MgO, CaO, SrO, and BaO, with MgO being within
  • the method of any one of the fifty-second through fifty-fourth aspects further comprises: a laminating step comprising laminating the glass substrate to a glass layer comprising soda lime glass at a lamination temperature within a range of from 100 °C to 200 °C and thereby forming a glass pane; wherein, the glass substrate exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 6.0 ppm/°C to 7.0 ppm/°C, and wherein, the glass substrate exhibits a density of less than 2.55 g/cm 3 .
  • the method of any one of the fifty-second through fifty-fifth aspects further comprises: a recycling step comprising recycling the glass pane with soda lime glass to form recycled glass material.
  • FIG. 1 is a perspective view of a glass substrate having a glass composition of the present disclosure, illustrating a first primary surface and a second primary surface;
  • FIG. 2 is an elevation view of the glass substrate of the present disclosure, illustrating the glass substrate further including a thickness;
  • FIG. 3 is an overhead plan view of an IGU including a pane, which is a laminate that includes the glass substrate of the present disclosure
  • FIG. 4 is an elevation view of a cross-section of the IGU of FIG. 3 taken through line IV-IV of FIG. 3, illustrating the IGU further including a first pane separated from a second pane that includes the glass substrate laminated to another layer;
  • FIG. 5 is a schematic diagram of a method, illustrating a fusion forming step whereby a ribbon of glass is formed from the glass composition of the present disclosure and a separating step whereby the glass substrate of FIG. 1 is separated from the ribbon of glass;
  • FIG. 6 is a side view of a fusion forming apparatus used for the fusion formation step.
  • FIG. 7 is a front view of both the fusion forming step and the separating step.
  • a glass substrate 10 includes a glass composition.
  • the glass compositions described herein are on an oxide basis and in mole percentages.
  • the glass composition includes (i) SiCh, within a range of from 70.0 to 80.0, (ii) AI2O3, within a range of from 1.60 to 9.20, (iii) Na2O, within a range of from 2.80 to 12.50, (iv) MgO, within a range of from 0 to 10.00, (v) CaO, within a range of from 0 to 8.00, (vi) SrO, within a range of from 0 to 8.00, (vii) ZnO, within a range of from 0 to 2.00, (viii) K2O, within a range of from 0 to 6.70, and (ix) SnCh, within a range of from 0 to 0.20.
  • the mole percentages of the constituents of the glass composition can be determined via X-ray fluorescence.
  • the glass composition includes (i) SiCh, within a range of from 72.0 to 78.5, (ii) AI2O3, within a range of from 1.70 to 9.20, (iii) R2O, within a range of from 5.30 to 11.60, and (iv) R’O, within a range of from 5.70 to 13.90.
  • R2O means Na2O and K2O collectively, and the value for R2O is the sum of the individual values for Na2O and K2O in the glass composition.
  • R’O means MgO, CaO, SrO, and BaO collectively, and the value for R’O is the sum of the individual values for MgO, CaO, SrO, and BaO in the glass composition.
  • the glass composition can include (i) Na2O within a range of from 2.80 to 11.60 and (ii) K2O within a range of from 0.005 to 6.7.
  • the glass composition can include (i) MgO within a range of from 0.40 to 8.30, (ii) CaO within a range of from 0.01 to 8.50, (iii) SrO within a range of from 0 to 6.50, and (iv) BaO within a range of from 0 to 0.10.
  • the glass composition provides one or more properties that help address the problem set forth in the Background, including at least a density that is reduced relative to soda lime glass.
  • the glass composition is substantially free of B2O3.
  • “Substantially free,” for purposes of this disclosure, means that the glass composition does not purposefully include the mentioned oxide (e.g., B2O3) but the same may be unintentionally present within the glass composition as a trace constituent because of manufacturing imperfections including raw material and equipment contamination.
  • the mentioned oxide could be present in amounts of 0.001 mole percent or less and the glass composition would be “substantially” free of the mentioned oxide.
  • the glass composition lacking B2O3 provides benefits, as discussed below.
  • the glass composition includes (i) SiCh, within a range of from 74.0 to 78.0, (ii) AI2O3, within a range of from 3.00 to 5.70, (iii) R2O, within a range of from 7.00 to 11.30, with Na2O being within a range of from 7.11 to 11.25 and K2O being within a range of from 0.005 to 6.7, and (iv) R’O, within a range of from 5.70 to 13.90, with MgO being within a range of from 2.50 to 8.30, CaO being within a range of from 0.01 to 4.20, SrO being within a range of from 0 to 5.20, and BaO being within a range of from 0 to 0.10.
  • R2O + CaO + SrO + BaO + ZnO - AI2O3 is within a range of from 8.70 to 11.64.
  • the sum of the mole percentages of R2O, CaO, SrO, BaO, and ZnO, less the mole percentage of AI2O3, in the composition is within a range of from 8.70 to 11.64. That range provides a balance between reducing the melting point of the glass composition and not increasing the density or the coefficient of thermal expansion of the glass composition too much.
  • these embodiments (and others) of the glass composition can exhibit a coefficient of thermal expansion (at 150 °C) that make the glass substrate 10 suitable for lamination with a layer of soda lime glass. Further, these embodiments (and others) of the glass composition can exhibit a liquidus viscosity and 200 Poise temperature that make the glass composition especially suitable for the fusion formation of the glass substrate 10 from the glass composition.
  • the glass composition includes SiCh and AI2O3.
  • Silica, SiCh represents the largest constituent, by mole percentage, in the glass composition and is a glass network former.
  • SiCh is the primary constituent of the resulting glass network of the glass composition.
  • Aluminum oxide, AI2O3, likewise is a glass network former and is a constituent of the resulting glass network of the composition.
  • increasing the combined mole percentage of SiCh and AI2O3 decreases the density of the glass substrate 10 but at the expense of increased temperature that the glass composition exhibits at a viscosity of 200 Poise, which affects manufacturing possibilities.
  • the mole percentage of SiCh in the glass composition can be 70.0, 71.0, 72.0, 72.5, 73.0, 73.5, 74.0, 74.5, 75.0, 75.5, 76.0, 76.5, 77.0, 77.5, 78.0, 78.5, 79.0, or 80.0, or within any range bound by any two of those values (e.g., from 73.0 to 78.0, from 72.0 to 78.5, from 74.0 to 78.0, from 75.5 to 77.0).
  • the mole percentage of AI2O3 in the glass composition can be 1.60, 1.70, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 5.70, 6.00, 6.50, 7.00, 7.50, 8.00, 8.50, 9.00, or 9.20, or within any range bound by any two of those values (e.g., from 3.00 to 6.00, from 1.60 to 7.00, from 1.70 to 9.20, from 3.00 to 5.70, from 1.70 to 6.00).
  • the glass composition includes R2O, which generally refers to alkali oxides as a group.
  • R2O is the sum solely of the alkali oxides Na2O and K2O, and both of those alkali oxide are present within the glass composition.
  • the glass composition can include one or more other alkali oxide such as Li2O, Rb2O, and CS2O.
  • the glass composition is substantially free of one or more (or all of) Li2O, Rb2O, and CS2O.
  • increasing the mole percentage of R2O lowers the density of the glass substrate 10, while increasing the coefficient of thermal expansion of the glass substrate 10.
  • these effects are balanced with the mole percentage of R2O being within the range of from 5.30 to 11.60, as mentioned.
  • the mole percentage of R2O in the composition can be 5.30, 5.50. 6.00, 6.50, 7.00, 7.50, 8.00, 8.50, 9.00, 9.50, 10.00, 10.50, 11.00, 11.30, 11.50, or 11.60, or within any range bound by any two of those values (e.g., from 7.00 to 11.30, from 8.00 to 10.00, and so on).
  • the mole percentage of Na2O can be within the range of from 2.80 to 12.50, as mentioned.
  • the mole percentage of Na2O in the glass composition can be 2.80. 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.10, 7.20,
  • the mole percentage of K2O can be within the range of from 0 to 6.7, as mentioned.
  • the mole percentage of K2O in the glass composition can be 0, 0.005, 0.01, 0.05, 0.10, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00,
  • the glass composition includes R’O, which generally refers to alkaline earth oxides as a group.
  • R’O is the sum solely of the alkaline oxides MgO, CaO, SrO, and BaO.
  • the glass composition could theoretically include one or more other of the remaining alkaline earth oxides such as BeO and RaO.
  • the glass composition is substantially free of either or both of BeO and RaO.
  • increasing the mole percentage of R’O decreases the temperature at which the glass substrate 10 exhibits a viscosity of 200 Poise but increases the density of the glass substrate 10.
  • these effects are balanced with the mole percentage of R’O being within the range of from 5.70 to 13.90, as mentioned.
  • the mole percentage of R’O is 5.70, 6.00, 6.50, 7.00,
  • the mole percentage of MgO can be within the range of from 0 to 10.00, as mentioned.
  • the mole percentage of MgO can be 0.40, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.30, 8.50, 9.00, 9.50, or 10.00, or within any range bound by any two of those values (e.g., from 2.00 to 8.50, from 0.40 to 8.30, from 2.50 to 8.30, from 4.50 to 7.00, and so on).
  • the mole percentage of CaO can be within a range of from 0 to 8.50, as mentioned.
  • the mole percentage of CaO can be 0, 0.01, 0.10, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.20, or 8.50, or within any range bound by any two of those values (e.g., from 0 to 4.50, from 0 to 8.00, from 0.01 to 4.20, from 2.50 to 8.20, and so on).
  • Strontium oxide, SrO having a much larger density than say MgO, more greatly increases the density of the glass substrate 10 as the mole percentage of SrO increases.
  • the mole percentage of SrO in the composition is within the range of from 0 to 8.00.
  • the mole percentage of SrO in the glass composition can be 0, 0.50, 1.00, 1.20, 1.50, 2.00, 2.40, 2.50, 3.00, 3.50, 3.60, 4.00, 4.50, 5.00, 5.20, 5.50, 6.00, 6.50, 7.00, 7.50, or 8.00, or within any range bound by any two of those values (e.g., from 0 to 6.00, from 0 to 5.20, from 0 to 5.00, from 0 to 3.60, from 0 to 2.40, from 0 to 1.20, and so on).
  • the mole percentage of BaO in the composition is within the range of from 0 to 0.10.
  • the glass composition can include ZnO.
  • the mole percentage of ZnO in the glass composition is within a range of from 0 to 2.00.
  • the mole percentage of ZnO in the glass composition is 0, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, or 2.00, or within any range bound by any two of those values (e.g., from 0 to 1.00, from 0.10 to 0.60, from 0.20 to 1.60, and so on).
  • the ratio (R’O + ZnO + R2O) / AI2O3 is within a range of from 3.00 to 6.80.
  • the ratio (R’O + ZnO + R2O) / AI2O3 can be 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 6.80, or within any range bound by any two of those values (e.g., from
  • the ratio R2O / (AI2O3 + MgO) is within a range of from 0.70 to 1.40.
  • the ratio R2O / (AI2O3 + MgO) can be 0.70, 0.80, 0.90, 1.00, 1.10 1.20, 1.30, 1.40, or within any range bound by any two of those values (e.g., 0.80 to 1.30, from 0.90 to 1.10, and so on).
  • R2O + CaO + SrO + BaO + ZnO - AI2O3 is within a range of from 8.70 to 11.64.
  • R2O + CaO + SrO + BaO + ZnO - AI2O3 can be 8.70, 8.80, 8.90, 9.00, 9.10, 9.20, 9.30, 9.40, 9.50, 9.60, 9.70, 9.80, 9.90, 10.00, 10.10, 10.20, 10.30, 10.40, 10.50, 10.60, 10.70, 10.80, 10.90, 11.00, 11.10, 11.20, 11.30, 11.40, 11.50, 11.60, 11.64, or within any range bound by any two of those values (e.g., from 9.00 to 11.40, from 9.80 to 10.60, and so on).
  • R2O + CaO + SrO + BaO + ZnO - AI2O3 - MgO is within a range of from 0.60 to 7.20.
  • R2O + CaO + SrO + BaO + ZnO - AI2O3 - MgO can be 0.60, 1.00,
  • the ratio (R’O + ZnO) / AI2O3 is within a range of from 1.00 to 4.00.
  • the ratio (R’O + ZnO) / AI2O3 can be 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00, 3.25, 3.50, or within any range bound by any two of those values (e.g., from 1.25 to
  • SiO 2 + MgO is within a range of from 78.00 to 83.50.
  • SiO 2 + MgO can be 78.00 78.50, 79.00, 79.50, 80.00, 80.50, 81.00, 81.50, 82.00, 82.50, 83.00, 83.50, or within any range bound by any two of those values (e.g., from 79.00 to
  • the ratio MgO / (R’O + ZnO) is within a range of from 0.350 to 0.700.
  • the ratio MgO / (R’O + ZnO) can be 0.350, 0.400, 0.450, 0.500, 0.550, 0.600, 0.650, 0.700, or within any range bound by any two of those values (e.g., from 0.400 to 0.450, from 0.450 to 0.650, and so on).
  • the ratio CaO / (R’O + ZnO) is within a range of from 0.004 to 0.620.
  • the ratio CaO / (R’O + ZnO) can be 0.004, 0.050, 0.100, 0.150, 0.200, 0.250, 0.300, 0.350, 0.400, 0.450, 0.500, 0.550, 0.600, 0.620, or within any range bound by any two of those values (e.g., from 0.050 to 0.500, from 0.250 to 0.600, and so on).
  • the ratio SrO / (R’O + ZnO) is within a range of from 0 to 0.370.
  • the ratio SrO / (R’O + ZnO) can be 0, 0.050, 0.100, 0.150, 0.200, 0.250, 0.300, 0.350, 0.370, or within any range bound by any two of those values (e.g., from 0.050 to 0.150, from 0.200 to 0.350, and so on).
  • the ratio (CaO + SrO + BaO) / AI2O3 is within a range of from 0.55 to 1.75.
  • the ratio (CaO + SrO + BaO) / Al 2 O 3 can be 0.55, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, I.75, or within any range bound by any two of those values (e.g., from 1.10 to 1.60, from 0.70 to 1.70, and so on). All the relationships expressed in this paragraph are thought, without being bound by theory, to increase the stability of alkaline earth alumino silicates of the glass composition without suboptimally affecting the other properties of the glass composition of the present disclosure.
  • R’O + ZnO is within a range of from 5.50 to 14.00.
  • R’O + ZnO can be 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.50, 9.00, 9.50, 10.00, 10.50, 11.00,
  • R2O - AI2O3 is within a range of from 4.60 to 6.10.
  • R2O - AI2O3 can be 4.60, 4.70, 4.80, 4.90, 5.00, 5.10, 5.20, 5.30, 5.40, 5.50, 5.60, 5.70, 5.80, 5.90, 6.00, 6.10, or within any range bound by any two of those values (e.g., from 4.70 to 5.80, from 4.90 to 6.00, and so on).
  • R2O - AI2O3 - MgO is within a range of from -2.90 to 3.10.
  • R 2 O - AI2O3 - MgO can be -2.90, -2.50, -2.00, -1.50, -1.00, -0.50, 0, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.10, or within any range bound by any two of those values (from -2.50 to 1.50, from 0 to 3.00, and so on).
  • R2O - AI2O3 - MgO - CaO is within a range of from -4.30 to 0.
  • R2O - AI2O3 - MgO - CaO is -4.25, -4.00, -3.50, - 3.00, -2.50, -2.00, -1.50, -1.00, -0.50, 0, or within any range bound by any two of those values (e.g., from -4.00 to -2.50, from -2.00 to -0.50, and so on). All the relationships expressed in this paragraph are thought, without being bound by theory, to help balance the properties of the glass composition of the present disclosure.
  • the glass composition can include SnCh, such as a fining agent.
  • the mole percentage of SnCh in the glass composition is within a range of from 0 to 0.20.
  • the mole percentage of SnCh in the glass composition is 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, or 0.20, or within any range bound by any two of those values (e.g., from 0 to 0.10, from 0.04 to 0.08, from 0.11 to 018, and so on).
  • SO3 may also be used as a fining agent.
  • the glass composition further includes one or more or all of Fe2C>3, TiCh, and CF, which may be present in the glass composition as tramp (unintentional) constituents.
  • the glass substrate 10 further includes a first primary surface 12, a second primary surface 14, and a thickness 16 therebetween.
  • the first primary surface 12 and the second primary surface 14 can face in generally opposite directions 18, 20.
  • the thickness 16 is the shortest straight-line distance between the first primary surface 12 and the second primary surface 14.
  • the thickness 16 is within a range of from 0.5 mm to 1.0 mm.
  • the thickness 16 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm, or within any range bound by any two of those values (e.g., from 0.6 mm to 0.9 mm, from 0.5 to 0.7 mm, and so on).
  • the thickness 16 can be greater than 1.0 mm or less than 0.5 mm.
  • the glass substrate 10 further includes a width 22 and a length 24.
  • the width 22 and the length 24 are measured orthogonally to each other. In embodiments, the width 22 is greater than 90 cm while the length 24 is greater than 100 cm.
  • the collection of properties that the glass substrate 10 exhibits allows the glass substrate 10 to be made with the thickness 16 being relatively thin and the width 22 and the length 24 being relatively long.
  • the glass substrate 10 exhibits a density of less than 2.60 g/cm 3 . In embodiments, the density that the glass substrate 10 exhibits is less than 2.55 g/cm 3 . In embodiments, the density that the glass substrate 10 exhibits is less than 2.50 g/cm 3 . In embodiments, the density that the glass substrate 10 exhibits is less than 2.45 g/cm 3 . In embodiments, the density that the glass substrate 10 exhibits is less than 2.40 g/cm 3 .
  • the density that the glass substrate 10 exhibits is 2.37 g/cm 3 , 2.38 g/cm 3 , 2.39 g/cm 3 , 2.40 g/cm 3 , 2.41 g/cm 3 , 2.42 g/cm 3 , 2.43 g/cm 3 , 2.44 g/cm 3 , 2.45 g/cm 3 , 2.46 g/cm 3 , 2.47 g/cm 3 , 2.48 g/cm 3 , 2.49 g/cm 3 , 2.50 g/cm 3 , 2.51 g/cm 3 , 2.52 g/cm 3 , 2.53 g/cm 3 , 2.54 g/cm 3 , 2.55 g/cm 3 , 2.56 g/cm 3 , 2.57 g/cm 3 , 2.58 g/cm 3 , 2.59 g/cm 3 , or 2.60 g/cm 3 ,
  • the glass substrate 10 exhibits a coefficient of thermal expansion at 150 °C that is within a range of from 4.8 ppm/°C to 7.6 ppm/°C.
  • the coefficient of thermal expansion that the glass substrate 10 exhibits is 4.8 ppm/°C, 4.9 ppm/°C, 5.0 ppm/°C, 5.1 ppm/°C, 5.2 ppm/°C, 5.3 ppm/°C, 5.4 ppm/°C, 5.5 ppm/°C, 5.6 ppm/°C, 5.7 ppm/°C, 5.8 ppm/°C, 5.9 ppm/°C, 6.0 ppm/°C, 6.1 ppm/°C, 6.2 ppm/°C, 6.3 ppm/°C, 6.4 ppm/°C, 6.5 ppm/°C, 6.6 ppm/°C, 6.7 ppm/°C, 6.8 ppm/°C, 6.9
  • the coefficient of thermal expansion is the amount of dimensional change as a function of temperature, and here throughout, a temperature range (e.g., °C), (such as from room temperature to 300 °C) that includes 150 °C.
  • the value at issue is the instantaneous value at 150 °C.
  • the coefficient of thermal expansion is determined following ASTM standard E228.
  • the glass substrate 10 exhibits a liquidus viscosity that is greater than 40,000 Poise. In embodiments, the liquidus viscosity that the glass substrate 10 exhibits is greater than 50,000 Poise, greater than 150,000 Poise, greater than 250,000 Poise, or greater than 400,000 Poise.
  • the liquidus viscosity that the glass substrate 10 exhibits is within a range of from 40,000 Poise to 1,500,000 Poise. In embodiments, the liquidus viscosity that the glass substrate 10 exhibits is within a range of from 40 kP (kP meaning kilopoise), 50 kP, 100 kP, 200 kP, 300 kP, 400 kP, 500 kP, 600 kP, 700 kP, 800 kP, 900 kP, 1000 kP, 1100 kP, 1200 kP, 1300 kP, 1400 kP, or 1500 kP, or within any range bound by any two of those values (e.g., from 200 kP to 900 kP, from 600 kP to 1400 kP, and so on).
  • the liquidus temperature of the glass substrate 10 is the temperature where the first crystal is observed in a standard gradient boat liquidus measurement conducted pursuant to ASTM C829-81.
  • the liquidus viscosity is the viscosity of the molten glass substrate 10 corresponding to the liquidus temperature.
  • the glass substrate 10 exhibits a viscosity at 200 Poise at a temperature of less than 1725 °C.
  • the temperature at which the glass substrate 10 exhibits a viscosity of 200 Poise is less than 1705 °C, less than 1700 °C, less than 1650 °C, less than 1630 °C, less than 1600 °C, or less than 1550 °C.
  • the temperature at which the glass substrate 10 exhibits a viscosity of 200 Poise is 1510 °C, 1515 °C, 1520 °C, 1530 °C, 1540 °C, 1550 °C, 1560 °C, 1570 °C, 1580 °C, 1590 °C, 1600 °C, 1610 °C, 1620 °C, 1630 °C, 1640 °C, 1650 °C, 1660 °C, 1670 °C, 1680 °C, 1690 °C, 1700 °C, 1705 °C, 1710 °C, 1720 °C, or 1725 °C, or within any range bound by any two of those values (e.g., from 1510 °C to 1725 °C, from 1520 °C to 1630 °C, and so on).
  • the temperature at which the glass substrate 10 exhibits a viscosity of 200 Poise is measured by concentric cylinder viscometry.
  • the insulated glass unit 100 includes a first pane 102 and a second pane 104, which are disposed substantially parallel to each other.
  • a space 106 separates the first pane 102 from the second pane 104.
  • the insulated glass unit 100 can include a spacer 108 between the first pane 102 and the second pane 104 to further define the space 106 and help establish a distance 110 between the first pane 102 and the second pane 104.
  • the distance 110 can be any value, but can be from 50 pm to 50 mm, such as from 5 mm to 25 mm.
  • the spacer 108 may be an edge seal formed around respective edges of the first pane 102 and the second pane 104, a metallic pillar between the surfaces of the first pane 102 and the second pane 104, a low thermal conduction material, or a glass bump attached to or formed integral with one or both of the first pane 102 and the second pane 104.
  • the insulated glass unit 100 can further include a frame 112 around the edges of the first pane 102 and the second pane 104.
  • the space 106 may be sealed and include an insulating gas such as air, argon, krypton, xenon, and combinations thereof.
  • the space 106 may be sealed and include a pressure less than atmospheric pressure.
  • the first pane 102 can be considered to be the outside glass pane (e.g., intended to face an exterior environment during use).
  • the second pane 104 can be considered to be the inside glass pane (e.g., intended to face an interior environment during use).
  • the insulated glass unit 100 may be part of a window or a door, among other options. Although the insulated glass unit 100 is illustrated and described herein as a double pane structure, the insulated glass unit 100 can be a triple pane structure or any number of panes.
  • the first pane 102 includes a body 114 with an outside surface 116 opposite an inside surface 118.
  • the outside surface 116 is directly exposed to an external environment 120 (e.g., outside).
  • the inside surface 118 is adjacent the space 106 between the first pane 102 and the second pane 104.
  • the first pane 102 additionally includes at least one outer edge 122.
  • the first pane 102 may include additional surfaces and/or edges.
  • the first pane 102 is formed from a glass material.
  • Example glass materials include soda lime glass, aluminosilicate glass, and borosilicate glass, among other options.
  • the first pane 102 further includes a low emissivity layer 124.
  • the low emissivity layer 124 may be on the inside surface 118, such that low emissivity layer 124 is shielded from weather and other outdoor elements.
  • the first pane 102 may be entirely comprised of a low emissivity composition, in which case the low emissivity layer 124 would occupy entirely the body 114 of the first pane 102.
  • Absorption and/or reflection of infrared and near infrared wavelengths from the external environment 120 by the low emissivity layer 124 minimizes heat transfer into the space 106, onto the second pane 104, and/or across the insulated glass unit 100 into an interior 126 such as of an enclosure or building.
  • the second pane 104 is a laminate that includes a first glass layer 128, the glass substrate 10 as a second glass layer 130, and an interlayer 132 disposed between the first glass layer 128 and the second glass layer 130.
  • the first glass layer 128 is or includes soda lime glass.
  • the interlayer 132 can assist with bonding the first glass layer 128 and the second glass layer 130 (the glass substrate 10) together.
  • Examples of the interlayer 132 include polyvinyl butyral (PVB), polycarbonate, acoustic PVB, ethylene vinyl acetate (EVA), thermoplastic polyurethane (TPU), an ionomer, a thermoplastic material, and/or combinations thereof.
  • the first glass layer 128 provides an outside surface 134 of the second pane 104.
  • the outside surface 134 is adjacent space 106 between the first pane 102 and the second pane 104.
  • the second primary surface 14 of the glass substrate 10 as the second glass layer 130 provides an inside surface 136 of the second pane 104.
  • the inside surface 136 is directly exposed to the interior 126.
  • the second pane 104 also includes at least an outer edge 138.
  • the second pane 104 may include additional surfaces and/or edges.
  • the first pane 102 has a thickness 140 between the inside surface 118 and the outside surface 116.
  • the thickness 140 is within a range of from 2.0 mm to 8.0 mm, such as about 5 mm.
  • the thickness 140 being thinner or thicker than those values is envisioned.
  • the first glass layer 128 of the second pane 104 likewise has a thickness 142.
  • the thickness 142 of the first glass layer 128 is from the outside surface 134 to a surface 144 facing the interlayer 132.
  • the thickness 142 of the first glass layer 128 is within a range of from 2.0 mm to 8.0 mm, such as about 5 mm.
  • the thickness 142 being thinner or thicker than those values is envisioned.
  • the thickness 16 of the second glass layer 130 of the second pane 104 (as an example use of the glass substrate 10 of the present disclosure) is within a range of from 0.5 mm to 1.0 mm.
  • the thickness 16 being thinner or thicker than those values is envisioned, as well.
  • Each of the first pane 102, the first glass layer 128 of the second pane 104, and the second glass layer 130 of the second pane 104 can have widths 22 and lengths 24 that are within a range of from 0.1 m to 10 m, such as greater than 90 cm (0.9 m) or greater than 100 cm (1.0 m). Wider, narrower, shorter, and longer values are envisioned.
  • the method 200 includes causing the glass composition of the present disclosure to flow in a molten state into a trough 204 of an isopipe 206.
  • the glass composition in the molten state then overflows the trough 204 and flows over outer forming surface 208 of the isopipe 206 to converge at a root 210 and to form a glass ribbon 212.
  • embodiments of the glass composition described herein while in the molten state, exhibit a temperature of less than 1705 °C and a viscosity of greater than 50,000, which make those embodiments compatible with the fusion forming step 202.
  • the method 200 further includes separating the glass substrate 10 from the glass ribbon 212.
  • a scoring device 216 with a scoring member 218 e.g., a score wheel, a scribe, a laser, among other options
  • a scoring device 216 with a scoring member 218 is extended in a direction toward the glass ribbon 212 so that scoring member 218 comes into contact with a first primary surface 12’ or a second primary surface 14’ of the glass ribbon 212.
  • the scoring device 216 is then traversed laterally across the glass ribbon 212, thereby forming a score line 220 across at least a portion of the total width 22 of glass ribbon 212.
  • the scoring device 216 and/or the scoring member 218 disengages from the glass ribbon 212 and the scoring device 216 and/or scoring member 218 is retracted in a direction away from the glass ribbon 212.
  • a bend can then be produced in the glass ribbon 212 that induces a tensile stress across the score line 220. That is, whichever of the first primary surface 12’ or the second primary surface 14’ of the glass ribbon 212 that includes the score line 220 is placed in tension across the score line 220, while the other of the first primary surface 12’ and the second primary surface 14’ is placed in compression.
  • the tensile stress in turn drives a crack from the score line 220 through the thickness of the glass ribbon 212, thereby completely separating the glass substrate 10 (as a glass sheet) from the glass ribbon 212.
  • the glass ribbon 212 at the location of the score line 220 may have a temperature in the range from about 350 °C to about 500 °C.
  • the method 200 further includes a laminating step 222.
  • the laminating step 222 includes laminating the glass substrate 10 to a glass layer (e.g., the first glass layer 128) comprising soda lime glass at a lamination temperature within a range of from 100 °C to 200 °C and thereby forming a glass pane (e.g., the second pane 104).
  • the glass substrate 10 can be attached to the first glass layer 128 with the interlayer 132 to produce a stack of those components.
  • the stack thus produced can then be heated to the lamination temperature using any suitable method or apparatus known in the art.
  • the stack can be placed in a vacuum chamber, such as in a vacuum or lamination bag.
  • the stack may be wrapped or otherwise secured to prevent shifting of the stack.
  • the stack may be secured using high-temperature tape, such as polyester tape.
  • a thin breather cloth can be wrapped around the stack according to various embodiments.
  • the stack(s) may be processed one at a time, in a single layer within the chamber, or in multiple layers of stacks, depending on the desired throughput.
  • the lamination bag can be heat sealed and a vacuum port can be attached thereto.
  • the vacuum chamber can be at least partially evacuated, and the stack(s) can be heated using a predetermined temperature and pressure profile.
  • the stack(s) can be placed between two plates which can be used to apply pressure to the stack and/or heat and/or cool the respective layers of the stack.
  • the laminating step 222 may be conducted with specific temperature and pressure profiles used to achieve desired adhesion (bonding) quality of the laminated structure.
  • other apparatuses and methods for achieving the lamination temperature and/or pressure can be used and are envisioned as falling within the scope of the disclosure.
  • the laminating step 222 can comprise ramping to the lamination temperature at a ramp rate ranging from 1 °C/min to 10 °C/min, such as from 2 °C/min to 9 °C/min, from 3 °C/min to 8 °C/min, from 4 °C/min to 7 °C/min, or from 5 °C/min to 6 °C/min.
  • the lamination pressure can range from about 0.1 MPa to about 1.5 MPa, such as from about 0.2 MPa to about 1.4 MPa, from about 0.3 MPa to about 1.3 MPa, from about 0.4 MPa to about 1.2 MPa, from about 0.5 MPa to about 1.1 MPa, from about 0.6 MPa to about 1 MPa, or from about 0.8 MPa to about 0.9 MPa, including all ranges and subranges therebetween. Pressure, if applied, may be applied gradually during temperature ramping or upon reaching the lamination temperature.
  • Pressure may be gradually applied, e.g., at a ramp rate ranging from 20 Pa/min to 100 Pa/min, such as from 30 Pa/min to 80 Pa/min, from 40 Pa/min to 70 Pa/min, or from 50 Pa/min to 60 Pa/min, including all ranges and subranges therebetween.
  • the stack may be held at the lamination temperature and pressure for a residence time ranging from 10 minutes to 120 minutes, such as from 20 minutes to 100 minutes, from 30 minutes to 80 minutes, or from 40 minutes to 60 minutes, including all ranges and subranges therebetween.
  • the temperature can be ramped down, e.g., to room temperature at a rate ranging from 1 °C/min to 10 °C/min, such as from about 2 °C/min to about 9 °C/min, from 3 °C/min to 8 °C/min, from 4 °C/min to 7 °C/min, or from 5 °C/min to 6 °C/min, including all ranges and subranges therebetween.
  • the temperature can be ramped down while maintaining the lamination pressure which can, in certain embodiments, reduce the formation of bubbles in the interlayer 132. Alternatively, the pressure can be reduced before or during temperature ramping.
  • a gradual pressure reduction can be used, in some embodiments, for instance, at a ramp rate ranging from 20 Pa/min to 100 Pa/min, such as from 30 Pa/min to 80 Pa/min, from 40 Pa/min to 70 Pa/min, or from 50 Pa/min to 60 Pa/min, including all ranges and subranges therebetween.
  • the method 200 further includes a recycling step 224.
  • the recycling step 224 includes recycling the glass pane (e.g., the second pane 104) with soda lime glass and the glass substrate 10 with the glass composition of the present disclosure to form recycled glass material.
  • the glass substrate 10 with the glass composition of the present disclosure, the insulated glass unit 100 incorporating the glass substrate 10, and the method 200 described herein address the problem set forth in the Background, in a variety of ways.
  • the glass composition lacks B2O3.
  • the glass substrate 10, and the second pane 104 with the first glass layer 128 of soda lime glass and the glass substrate 10 can be recycled together with other soda lime glasses.
  • the coefficient of thermal expansion of the second glass layer 130 should be about 6.5 ppm/°C to generate no bow upon cooling.
  • the glass substrate 10 with the glass composition of the present disclosure exhibits a coefficient of thermal expansion within a range approximately centered around that value.
  • the glass composition of the glass substrate 10 of the present disclosure exhibits a liquidus viscosity and a temperature at a viscosity of 200 Poise that permits the glass substrate 10 to be formed via the fusion forming step 202, which can generate thin, wide, and long sheets suitable for integration within modern insulated glass units 100.
  • This combination of a relatively low temperature at a viscosity of 200 Poise yet a relatively high liquidus viscosity is challenging to obtain, but the glass composition of the present disclosure does. Consequently, the thin glass substrate 10 can be used as a laminate with the thicker soda lime glass, instead of another layer of thick soda lime glass, and thereby makes more efficient use of resources and reduces the overall weight of the laminate and insulated glass unit 100.
  • the glass substrate 10 itself has a relatively low density, which reduces shipping costs and product weight.
  • Examples 1-26 The glass substrates of Examples 1-26 were batched and fusion formed. The mole percentages of the identified constituents were determined via X-ray fluorescence. Various properties were measured via the methods described above. The measured values for the mole percentages of the glass compositions and for the properties that the glass substrates exhibit are set forth in Table 1 below.
  • Examples 1-26 exhibit all of the following properties: (i) a coefficient of thermal expansion at 150 °C that is within a range of from 6.0 ppm/°C to 7.0 ppm/°C, (ii) a liquidus viscosity that is greater than 150,000 Poise, (iii) a viscosity of 200 Poise at a temperature of less than 1705 °C, and (iv) a density that is less than 2.55 g/cm 3 .
  • Examples 27-48 The glass substrates of Examples 27-48 were also batched and fusion formed. The mole percentages of the identified constituents were determined via X- ray fluorescence. Various properties were measured via the methods described above. The measured values for the mole percentages of the glass compositions and for the properties that the glass substrates exhibit are set forth in Table 2 below. Examples 27-48 are all examples of embodiments of the glass substrate of the present disclosure that exhibit a density that is less than 2.55 g/cm 3 .
  • Examples 29-31, 36, and 48 can be comparative examples regarding the coefficient of thermal expansion at 150 °C as falling outside of the range of from 6.0 ppm/°C to 7.0 ppm/°C, while all of Examples 1-26 exhibit a coefficient of thermal expansion within that range.
  • Examples 27-38 and 48 can be comparative examples regarding liquidus viscosity, as they all exhibit a liquid viscosity that is less than 150,000 Poise.
  • Examples 30, 31, and 33 can be comparative examples as exhibiting a viscosity of 200 Poise at a temperature of greater than 1705 °C.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

L'invention concerne un substrat en verre comprenant (sur une base d'oxyde et en pourcentage molaire) : 70,0 à 80,0 SiO2 ; 1,60 à 9,20 Al2O3 ; 2,80 à 12,50 Na2O ; 0 à 10,00 MgO ; 0 à 8,50 CaO ; 0 à 8,00 SrO ; 0 à 2,00 ZnO ; 0 à 6,70 K2O ; et 0 à 0,20 SnO2. La composition de verre est sensiblement exempte de B2O3. Le substrat en verre présente un coefficient de dilatation thermique à 150 °C qui se situe dans une plage de 5,5 à 7,0 ppm/°C. Le substrat en verre présente une densité inférieure à 2,60 g/cm3. Le substrat en verre présente une viscosité égale à 200 poises à une température inférieure à 1 700 °C. Le substrat en verre présente une viscosité du liquidus qui est supérieure à 150 000 poises.
PCT/US2025/026096 2024-04-25 2025-04-24 Substrat en verre présentant un coefficient de dilatation thermique apte à réduire la déformation d'un stratifié, une recyclabilité améliorée et la capacité d'être formé par fusion, ensemble verre isolé l'incorporant, et procédé de fabrication associé Pending WO2025226889A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130093312A1 (en) * 2010-07-15 2013-04-18 Asahi Glass Company, Limited Plasma display device
WO2017139552A1 (fr) * 2016-02-10 2017-08-17 Corning Incorporated Plaque de guidage de lumière composite
US20180305240A1 (en) * 2015-10-22 2018-10-25 Corning Incorporated Substrates for use in fluorescent-detection methods having glass substrate portion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130093312A1 (en) * 2010-07-15 2013-04-18 Asahi Glass Company, Limited Plasma display device
US20180305240A1 (en) * 2015-10-22 2018-10-25 Corning Incorporated Substrates for use in fluorescent-detection methods having glass substrate portion
WO2017139552A1 (fr) * 2016-02-10 2017-08-17 Corning Incorporated Plaque de guidage de lumière composite

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