Claims
- 1. An alkali-free glass consisting essentially of from 60 to 72 mol % of SiO.sub.2, from 9 to 14 mol % of Al.sub.2 O.sub.3, from 5 to 12 mol % of B.sub.2 O.sub.3, from 0 to 6 mol % of MgO, from 0 to 6 mol % of CaO, from 1 to 9 mol % of SrO, from 0 to 0.5 mol % of BaO, and from 7 to 18 mol % of MgO+CaO+SrO+BaC and having a strain point of at least 640.degree. C. and formed from a float process.
- 2. The alkali-free glass according to claim 1, which contains substantially no PbO, As.sub.2 O.sub.3 or Sb.sub.2 O.sub.3.
- 3. The alkali-free glass according to claim 1, which has a density of less than 2.60 g/cc.
- 4. The alkali-free glass according to claim 1, which has a coefficient of thermal expansion of less than 40.times.10.sup.-7 /.degree. C.
- 5. The alkali-free glass according to claim 1, wherein the content of P.sub.2 O.sub.5 is not more than 20 ppm in mol.
- 6. The alkali-free glass according to claim 1, which consists essentially of from 66 to 70 mol % of SiO.sub.2, from 9 to 14 mol % of Al.sub.2 O.sub.3, from 6 to 9.5 mol % of B.sub.2 O.sub.3, from 1 to 5 mol % of MgO, from 1 to 6 mole of CaO, from 2 to 8 mol % of SrO, and from 9 to 16 mol % of MgO+CaO+SrO and which contains substantially no BaO.
- 7. The alkali-free glass according to claim 6, which has a strain point of at least 650.degree. C.
- 8. The alkali-free glass according to claim 6, which has a density of less than 2.55 g/cc.
- 9. A liquid display panel comprising a pair of substrates constituting a cell, wherein at least one of the substrates is made of an alkali-free glass consisting essentially of from 60 to 72 mol % of SiO.sub.2, from 9 to 14 mol % of Al.sub.2 O.sub.3, from 5 to 12 mol % of B.sub.2 O.sub.3, from 0 to 6 mol % of MgO, from 0 to 6 mol % of CaO, from 1 to 9 mol % of SrO, from 0 to 0.5 mol % of BaO, and from 7 to 18 mol % of MgO+CaO+SrO+BaO and having a strain point of at least 640.degree. C. and formed from a float process.
- 10. The liquid display panel according to claim 9, wherein the alkali-free glass consists essentially of from 66 to 70 mol % of SiO.sub.2, from 9 to 14 mol % of Al.sub.2 O.sub.3, from 6 to 9.5 mol % of B.sub.2 O.sub.3, from 1 to 5 mol % of MgO, from 1 to 6 mol % of CaO, from 2 to 8 mol % of SrO, and from 9 to 16 mol % of MgO+CaO+SrO and which contains substantially no BaO.
- 11. The alkali-free glass according to claim 1, wherein the temperature at which the viscosity of said alkali-free glass becomes 10.sup.4 poises is not lower than the liquidus temperature of said alkali-free glass.
- 12. The alkali-free glass according to claim 6, wherein the temperature at which the viscosity of said alkali-free glass becomes 10.sup.4 poises is not lower than the liquidus temperature of said alkali-free glass.
Priority Claims (2)
Number |
Date |
Country |
Kind |
6-296522 |
Nov 1994 |
JPX |
|
7-273234 |
Oct 1995 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 08/563,824 filed on Nov. 28, 1995, now abandoned.
US Referenced Citations (10)
Continuations (1)
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Number |
Date |
Country |
Parent |
563824 |
Nov 1995 |
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