Claims
- 1. A barium aluminosilicate glass exhibiting a strain point higher than 650.degree. C., a weight loss less than 20 mg/cm.sup.2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95.degree. C., a CTE between 34 and 50.times.10.sup.-7 /.degree.C., nominally free of alkali metal oxides and having a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 50-65% SiO.sub.2, at least 8% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being 8-13% and CaO 0-7.1% in conjunction with 55-65% SiO.sub.2 and the Al.sub.2 O.sub.3 being 18-22% and CaO 0-18% in conjunction with 50-55% SiO.sub.2, SiO.sub.2 +Al.sub.2 O.sub.3 >68%, 0-6% B.sub.2 O.sub.3, 2-21% BaO, 0-13% SrO, 0-6% MgO and 13-20% BaO+ CaO+SrO+MgO.
- 2. A glass in accordance with claim 1 having a CTE in the range of 36-40.times.10.sup.-7 /.degree.C.
- 3. A glass in accordance with claim 1 having CTE in the range of 42-50.times.10.sup.-7 /.degree.C.
- 4. A glass in accordance with claim 3 in which the composition includes 5-18% CaO and the BaO+CaO+SrO content is 18-28%, both by weight.
- 5. A glass in accordance with claim 1 having a weight loss of less than one mg/cm.sup.2 after 24 hour immersion in 5% HCl solution at 95.degree. C. and wherein the composition includes at least 55% SiO.sub.2, SiO.sub.2 +Al.sub.2 O.sub.3 >68% and 0-<6% B.sub.2 O.sub.3, all by weight.
- 6. An LCD device comprising a barium aluminosilicate glass panel, the glass exhibiting a strain point higher than 650.degree. C., a weight loss less than 20 mg/cm.sup.2 after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95.degree. C., a CTE between 34 and 50.times.10.sup.-7 /.degree.C., nominally free of alkali metal oxides and having a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 50-65% SiO.sub.2, at least 8% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being 8-13% and CaO 0-7.1% in conjunction with 55-65% SiO.sub.2 and the Al.sub.2 O.sub.3 being 18-22% and CaO 0-18% in conjunction with 50-55% SiO.sub.2, SiO.sub.2 +Al.sub.2 O.sub.3 >68%, 0-6% B.sub.2 O.sub.3, 2-21% BaO, 0-13% SrO, 0-6% MgO and 13-30% BaO+CaO+SrO+MgO.
- 7. An LCD device in accordance with claim 6 wherein the glass panel has a CTE in the range of 42-50.times.10.sup.-7 /.degree.C. and the composition includes 5-18% CaO and the BaO+CaO+SrO content is 18-28%, all by weight.
- 8. An LCD device in accordance with claim 6 wherein the glass panel has a weight loss of less than one mg/cm.sup.2 after 24 hour immersion in 5% HCl solution at 95.degree. C. and wherein the composition includes at least 55% SiO.sub.2, SiO.sub.2 +Al.sub.2 O.sub.3 >68% and 0-<6% B.sub.2 O.sub.3 all by weight.
- 9. A method of producing a glass panel for an LCD device which comprises melting a batch for a barium aluminosilicate glass consisting essentially of, as calculated in percent by weight on an oxide basis, 50-65% SiO.sub.2 at least 8% Al.sub.2 O.sub.3, the Al.sub.2 O.sub.3 being 8-13% and CaO 0-7.1% in conjunction with 55-65% SiO.sub.2 and the Al.sub.2 O.sub.3 being 18-22% and CaO 0-18% in conjunction with 50-55% SiO.sub.2, SiO.sub.2 +Al.sub.2 O.sub.3 >68%, 0-6% B.sub.2 O.sub.3, 2-21% BaO, 0-13% SrO, 0-6% MgO and 13-30% BaO+CaO, SrO+MgO, and drawing a thin sheet of molten glass for the melt.
- 10. A method in accordance with claim 9 wherein the glass sheet is drawn by the float process.
Parent Case Info
This is a continuation of Ser. No. 08/212,060, filed Mar. 14, 1994, now abandoned.
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212060 |
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