Claims
- 1. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 2.5 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, and Al2O3 being 6-14% in conjunction with 55-67% SiO2 and 16-23% in conjunction with 49-58% SiO2, SiO2+Al2O3>68%, 0 to less than 8% B2O3, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.
- 2. A flat panel display in accordance with claim 1 in which the glass panel has a CTE in the range of 31-44×10−7/°C. and the glass is selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;a. 49-58% SiO2, 17.5-23% Al2O3, 0 to less than 8% B2O3, 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO and MgO+CaO+SrO+BaO being 13-28%, b. 57-66% SiO2, 8-14% Al2O3, 0 to less than 8% B2O3, 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO and 2-21% BaO.
- 3. A flat panel display in accordance with claim 2 in which the glass panel has a CTE in the range of 32-40×10−7/°C. and the aluminosilicate sub-families consist essentially of:a. 54-57% SiO2, 17.5-23% Al2O3, 5 to less than 8% B2O3, 2-2.75% MgO, 1.5- <7% CaO, 2-6% SrO and 0.5-9.5% BaO, b. 57-65.5% SiO2, 8-13% Al2O3, 4 to less than 8% B2O3, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.
- 4. A flat panel display in accordance with claim 1 in which the glass panel has a CTE in the range of 44-57×10−7/°C. and the glass is selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis:a. 50-57% SiO2, 16-22% Al2O3, 0-5.5% B2O3, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO and 1-21% BaO, b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO and MgO+CaO+SrO+BaO being 16.5- 28%.
- 5. A flat panel display in accordance with claim 4 in which the glass panel has a CTE in the range of 45-50×10−7/°C. and the aluminosilicate sub-families consist essentially of:a. 50-57% SiO2, 16-20% Al2O3, 0-5.5% B2O3, 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO and 1-21% BaO, b. 55-67% SiO2, 6-<13% Al2O3, 0-7.5% B2O3, 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO and 2-9.5% BaO.
- 6. A flat panel display in accordance with claim 1 in which the glass panel has a strain point greater than 660° C. and a weight loss less than 1 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., the glass being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis:a. 54-58% SiO2, 16-23% Al2O3, 0-6% B2O3, 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%, b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.
- 7. A flat panel display in accordance with claim 1 in which the glass panel has a density less than 2.5 grams/cc and a composition, as calculated in weight percent on an oxide basis, consisting essentially of 54.8-57% SiO2, 16.8-21.8% Al2O3, 0 to less than 8% B2O3, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%.
- 8. A method of producing a glass panel for a flat panel display which comprises melting a batch for an aluminosilicate glass 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 to less than 8% B2O3, at least one alkaline earth metal oxide selected from the group consisting of, in the indicated proportions, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO, +SrO+MgO, and drawing a thin sheet of molten glass from the melt.
- 9. A method in accordance with claim 8 wherein the glass sheet is drawn by a float process.
- 10. An aluminosilicate glass exhibiting a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE between 31 and 57×10−7/°C., nominally free of alkali metal oxides and having 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 to less than 8% B2O3, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.
- 11. An aluminosilicate glass in accordance with claim 10 having a CTE in the range of 31-44×10−7/°C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;a. 49-58% SiO2, 17.5-23% Al2O3, 0 to less than 8% B2O3, 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO, the glass containing at least one alkaline earth oxide in the indicated proportion and the total BaO+CaO+SrO+MgO content being 13-28%, b. 57-66% SiO2, 8-14% Al2O3, 0 to less than 8% B2O3, 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO, 2-21% BaO.
- 12. An aluminosilicate glass in accordance with claim 11 in which the glass has a CTE of 32-40×10−7/°C. and the aluminosilicate sub-families consist essentially of:a. 54-57% SiO2, 17.5-23% Al2O3, 5 to less than 8% B2O3, 2-2.75% MgO, 1.5-<7% CaO, 2-6% SrO and 0.5-9.5% BaO, b. 57-65.5% SiO2, 8-13% Al2O3, 4 to less than 8% B2O3, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.
- 13. An aluminosilicate glass in accordance with claim 10 having a CTE in the range of 44-57×10−7/°C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis:a. 50-75% SiO2, 16-22% Al2O3, 0-5.5% B2O3, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, 1-21% BaO, b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO, the total MgO+CaO+SrO+BaO being 16.5-28%.
- 14. An aluminosilicate glass in accordance with claim 13 in which the glass has a CTE in the range of 45-50×10−7/°C. and the aluminosilicate sub-families consist essentially of:a. 50-57% SiO2, 16-20% Al2O3, 0-5.5% B2O3, 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO, and 1-21% BaO, b. 55-67% SiO2, 6-<13% Al2O3, 0-7.5% B2O3, 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO and 2-9.5% BaO.
- 15. An aluminosilicate glass in accordance with claim 10 having a strain point greater than 660° C. and a weight loss less than 1 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis:a. 54-58% SiO2, 16-23% Al2O3, 0-6% B2O3, 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%, b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.
- 16. An aluminosilicate glass in accordance with claim 10 having a density less than 2.5 grams/cc and a composition consisting essentially of 54.8-57% SiO2, 16.8-21.8% Al2O3, 0 to less than 8% B2O3, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%.
- 17. An aluminosilicate glass substrate exhibiting a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE between 31 and 57×10−7/°C., nominally free of alkali metal oxides and having 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 to less than 8% B2O3, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.
- 18. An aluminosilicate glass substrate in accordance with claim 17 having a CTE in the range of 31-44×10−7/°C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;a. 49-58% SiO2, 17.5-23% Al2O3, 0 to less than 8% B2O3, 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO, the glass containing at least one alkaline earth oxide in the indicated proportion and the total BaO+CaO+SrO+MgO content being 13-28%, b. 57-66% SiO2, 8-14% Al2O3, 0 to less than 8% B2O3, 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO, 2-21% BaO.
- 19. An aluminosilicate glass substrate in accordance with claim 18 in which the glass has a CTE of 32-40×10−7/°C. and the aluminosilicate sub-families consist essentially of:a. 54-57% SiO2, 17.5-23% Al2O3, 5 to less than 8% B2O3, 2-2.75% MgO, 1.5-<7% CaO, 2-6% SrO and 0.5-9.5% BaO, b. 57-65.5% SiO2, 8-13% Al2O3, 4 to less than 8% B2O3, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.
- 20. An aluminosilicate glass substrate in accordance with claim 17 having a CTE in the range of 44-57×10−7/°C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis:a. 50-57% SiO2, 16-22% Al2O3, 0-5.5% B2O3, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, 1-21% BaO, b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO, the total MgO+CaO+SrO+BaO being 16.5-28%.
- 21. An aluminosilicate glass substrate in accordance with claim 20 in which the glass has a CTE in the range of 45-50×10−7/°C. and the aluminosilicate sub-families consist essentially of:a. 50-57% SiO2, 16-20% Al2O3, 0-5.5% B2O3, 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO and 1-21% BaO, b. 55-67% SiO2, 6-<13% Al2O3, 0-7.5% B2O3, 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO and 2-9.5% BaO.
- 22. An aluminosilicate glass substrate in accordance with claim 17 having a strain point greater than 660° C. and a weight loss less than 1 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis:a. 54-58% SiO2, 16-23% Al2O3, 0-6% B2O3, 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%, b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.
- 23. An aluminosilicate glass substrate in accordance with claim 17 having a density less than 2.5 grams/cc and a composition consisting essentially of 54.8-57% SiO2, 16.8-21.8% Al2O3, 0 to less than 8% B2O3, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%.
- 24. A method of producing a glass panel for a flat panel display, by a float glass process, which comprises melting a batch for an aluminosilicate glass consisting essentially of, as calculated in percent by weight on an oxide basis, 60 up to 67% SiO2, at least 6% Al2O3, SiO2+Al2O3>68%, B2O3 which is present in an amount of up to 8%, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO and drawing a thin sheet of molten glass from the melt.
- 25. A method according to claim 24, wherein the aluminosilicate glass composition consists essentially of above 60 up to 67% SiO2.
- 26. A method of producing a glass panel for a flat panel display which comprises melting a batch for an aluminosilicate glass consisting essentially of, as calculated in weight percent on an oxide basis, above 60% up to 67% SiO2, at least 6% Al2O3, SiO2+Al2O3>68%, B2O3 which is present in an amount of up to 15%, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO, and drawing a thin sheet of molten glass from the melt by a float process.
- 27. A method of producing a glass panel for a flat panel display which comprises melting a batch for aluminosilicate glass which is nominally free of alkali metal oxides and has a composition that consists essentially of, as calculated in percent by weight on an oxide basis, 49-58% SiO2, 17.5-23% Al2O3, 0-14.5% B2O3, 0-8% MgO, 0-9% CaO, 0.4-13.5% SrO, 0-21% BaO, and 13-28% MgO+CaO+SrO+BaO, and drawing a thin sheet of molten glass from the melt by a float process wherein the glass panel has a strain point higher than 640° C., a CTE in the range of 31-44×10−7/° C., and a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C.
- 28. The method according to claim 27, wherein the CTE is in the range of 32-40×10−7/° C.
- 29. The method according to claim 27, wherein the glass panel has a CTE in the range of 32-40×10−7/° C. and the glass has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 54-57% SiO2, 17.5-23% Al2O3, 5 to less than 8% B2O3, 2-2.75% MgO, 1.5-<7% CaO, 2-6% SrO, and 0.5-9.5% BaO.
- 30. A glass panel produced by the method of claim 27.
- 31. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 31-44×10−7/° 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, 57-66% SiO2, 8-14% Al2O3, 0 to less than 8% B2O3, 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO, and 2-21% BaO.
- 32. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 32-40×10−7/° 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, either: a. 54-57% SiO2, 17.5-23% Al2O3, 5 to less than 8% B2O3, 2-2.75% MgO, 1.5-<7.1% CaO, 2-6% SrO, and 0.5-9.5% BaO or b. 57-65.5% SiO2, 8-13% Al2O3, 4 to less than 8% B2O3, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO, and 2-21% BaO.
- 33. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 44-57×10−7/° 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, either: a. 50-57% SiO2, 16-22% Al2O3, 0-5.5% B2O3, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, and 1-21% BaO or b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO, and MgO+CaO+SrO+BaO being 16.5-28%.
- 34. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 45-50×10−7/° 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, either: a. 50-57% SiO2, 16-20% Al2O3, 0-5.5% B2O3, 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO, and 1-21% BaO or b. 55-67% SiO2, 6-<13% Al2O3, 0-7.5% B2O3, 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO, and 2-9.5% BaO.
- 35. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 660° C., a weight loss less than 1 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, either: a. 54-58% SiO2, 16-23% Al2O3, 0-6% B2O3, 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO, and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27% or b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, and MgO+CaO+SrO+BaO being 18-28%.
- 36. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 2.5 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, has a density less than 2.5 grams/cc, and a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 54.8-57% SiO2, 16.8-21.8% Al2O3, 0 to less than 8% B2O3, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, and MgO+CaO+SrO+BaO being 12.5-27%.
- 37. An aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 31-44×10−7/° 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, 57-66% SiO2, 8-14% Al2O3, 0 to less than 8% B2O3, 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO, and 2-21% BaO.
- 38. An aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 32-40×10−7/° 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, either: a. 54-57% SiO2, 17.5-23% Al2O3, 5 to less than 8% B2O3, 2-2.75% MgO, 1.5-<7% CaO, 2-6% SrO, and 0.5-9.5% BaO or b. 57-65.5% SiO2, 8-13% Al2O3, 4 to less than 8% B2O3, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO, and 2-21% BaO.
- 39. An aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 44-57×10−7/° 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, either: a. 50-57% SiO2, 16-22% Al2O3, 0-5.5% B2O3, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, and 1-21% BaO or b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO, and the total MgO+CaO+SrO+BaO being 16.5-28%.
- 40. An aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 45-50×10−7/° 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, either: a. 50-57% SiO2, 16-20% Al2O3, 0-5.5% B2O3, 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO, and 1-21% BaO or b. 55-67% SiO2, 6-<13% Al2O3, 0-7.5% B2O3, 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO, and 2-9.5% BaO.
- 41. An aluminosilicate glass that exhibits a strain point higher than 660° C., a weight loss less than 1 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, either: a. 54-58% SiO2, 16-23% Al2O3, 0-6% B2O3, 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO, 0-14.5% BaO, and MgO+CaO+SrO+BaO being 15-27% or b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, and MgO+CaO+SrO+BaO being 18-28%.
- 42. An aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 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, has a density less than 2.5 grams/cc, and a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 54.8-57% SiO2, 16.8-21.8% Al2O3, 0 to less than 8% B2O3, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, and MgO+CaO+SrO+BaO being 12.5-27%.
- 43. An aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 31-44×10−7/° 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, 57-66% SiO2, 8-14% Al2O3, 0 to less than 8% B2O3, 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO, and 2-21% BaO.
- 44. A aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 32-40×10−7/° 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, either: a. 54-57% SiO2, 17.5-23% Al2O3, 5 to less than 8% B2O3, 2-2.75% MgO, 1.5-<7% CaO, 2-6% SrO, and 0.5-9.5% BaO or b. 57-65.5% SiO2, 8-13% Al2O3, 4 to less than 8% B2O3, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO, and 2-21% BaO.
- 45. An aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 44-57×10−7/° 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, either: a. 50-57% SiO2, 16-22% Al2O3, 0-5.5% B2O3, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, and 1-21% BaO or b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO, and the total MgO+CaO+SrO+BaO being 16.5-28%.
- 46. An aluminosilicate glass that exhibits a strain point higher than 640° C., a weight loss less than 2.5 mg/cm2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 45-50×10−7/° 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, either: a. 50-57% SiO2, 16-20% Al2O3, 0-5.5% B2O3, 2-2.75% MgO, 1-<7% CaO, 0.5-15% SrO, and 1-21% BaO or b. 55-67% SiO2, 6-<13% Al2O3, 0-7.5% B2O3, 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO, and 2-9.5% BaO.
- 47. An aluminosilicate glass panel that exhibits a strain point higher than 660° C., a weight loss less than 1 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, either: a. 54-58% SiO2, 16-23% Al2O3, 0-6% B2O3, 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO, 0-14.5% BaO, and MgO+CaO+SrO+BaO being 15-27% or b. 55-67% SiO2, 6-14% Al2O3, 0-7.5% B2O3, 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, and MgO+CaO+SrO+BaO being 18-28%.
- 48. An aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 2.5 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, has a density less than 2.5 grams/cc, and a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 54.8-57% SiO2, 16.8-21.8% Al2O3, 0 to less than 8% B2O3, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, and MgO+CaO+SrO+BaO being 12.5-27%.
Parent Case Info
This application is a Continuation-In-Part of U.S. Ser. No. 08/212,060, filed Mar. 14, 1994, now abandoned.
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Divisions (1)
|
Number |
Date |
Country |
Parent |
08/288300 |
Aug 1994 |
US |
Child |
09/060741 |
|
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08/212060 |
Mar 1994 |
US |
Child |
08/288300 |
|
US |
Reissues (1)
|
Number |
Date |
Country |
Parent |
08/288300 |
Aug 1994 |
US |
Child |
09/060741 |
|
US |