IP Library › Granted Patent US 7,087,541
Granted Patent B2
US 7,087,541 · App. 10/867,202 · Granted Aug 8, 2006

Glass composition for display panels

Assignee: Corning Incorporated
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Quick Facts
Patent No.
US 7,087,541
App. No.
10/867,202
Granted
Aug 8, 2006
Kind
B2
Abstract

A glass composition suitable for manufacturing plasma displays and large-area displays using the fusion draw process is provided. The glass composition includes 59–66 mol % SiO 2 , 14.5–18.0 mol % Al 2 O 3 , 8.5–12.0 mol % Na 2 O, 2.5–6.5 mol % K 2 O, 2.5–9.0 mol % CaO, 0.0–3.0 mol % MgO, 0.0–3.0 mol % SrO, 0.0–3.0 mol % BaO, and 0.0–5.0 mol % MgO+SrO+BaO.

Claims (27)

1. A glass composition comprising 59–66 mol % SiO 2 , 14.5–18.0 mol % Al 2 O 3 , 8.5–12.0 mol % Na 2 O, 2.5–6.5 mol % K 2 O, 2.5–9.0 mol % CaO, 0.0–3.0 mol % MgO, 0.0–3.0 mol % SrO, and 0.0–3.0 mol % BaO.

2. The glass composition of claim 1 , wherein MgO+SrO+BaO are present in a total amount of 0–5 mol %.

3. The glass composition of claim 2 having a liquidus temperature of 1100° C. or less.

4. The glass composition of claim 2 having a viscosity at a liquidus temperature of at least 10 5 poise.

5. The glass composition of claim 2 having a viscosity at a liquidus temperature in excess of 4×10 5 poise.

6. The glass composition of claim 2 having a linear coefficient of thermal expansion of 80 to 95×10 31 7 /° C. over a temperature range of 25 to 300° C.

7. The glass composition of claim 6 having a linear coefficient of thermal expansion of 87 to 92×10 −7 /° C. over a temperature range of 25 to 300° C.

8. The glass composition of claim 2 having a strain point greater than 580° C.

9. The glass composition of claim 8 having a strain point of at least 640° C.

10. The glass composition of claim 2 further comprising at least one oxide selected from the group consisting of B 2 O 3 , P 2 O 5 , Li 2 O, Y 2 O 3 , La 2 O 3 , and ZnO in a total amount not exceeding 5 mol %.

11. The glass composition of claim 2 wherein a molar ratio of Na 2 O to K 2 O is approximately 1.0.

12. The glass composition of claim 2 wherein a molar ratio of Na 2 O to K 2 O is in a range from 1.2 to 3.0.

13. The glass composition of claim 2 comprising 60–65 mol % SiO 2 , 15.5–17.0 mol % Al 2 O 3 , 9.5–11.0 mol % Na 2 O, 3.5–5.5 mol % K 2 O, 3.5–8.0 mol % CaO, 0.0–2.0 mol % MgO, 0.0–2.0 mol % SrO, 0.0–2.0 mol % BaO, and 0.0–3.0 mol% MgO+SrO+BaO.

14. The glass composition of claim 2 further comprising at least one oxide selected from the group consisting of B 2 O 3 , P 2 O 5 , Li 2 O, Y 2 O 3 , La 2 O 3 , and ZnO in a total amount not exceeding 3 mol %.

15. The glass composition of claim 2 having a strain point of at least 640° C. and a linear coefficient of thermal expansion of 80 to 95×10 −7 /° C. over a temperature range of 25 to 300° C.

16. The glass composition of claim 15 having a liquidus temperature of 1100° C. or less.

17. The glass composition of claim 15 having a viscosity at a liquidus temperature of at least 10 5 poise.

18. The glass composition of claim 15 having a viscosity at a liquidus temperature in excess of 4×10 5 poise.

19. The glass composition of claim 15 , comprising 60–65 mol % SiO 2 , 15.5–17.0 mol % Al 2 O 3 , 9.5–11.0 mol % Na 2 O, 3.5–5.5 mol % K 2 O, 3.5–8.0 mol % CaO, 0.0–2.0 mol % MgO, 0.0–2.0 mol % SrO, 0.0–2.0 mol % BaO, and 0.0–3.0 mol % MgO+SrO+BaO.

20. A glass substrate for an electronic display device, comprising: a flat, transparent glass exhibiting a strain point of at least 640° C. and a linear coefficient of thermal expansion of 80 to 95×10 −7 /° C. over a temperature range of 25 to 300° C., said glass having the glass composition of claim 2 .

21. The glass composition of claim 1 , comprising 60–65 mol % SiO 2 , 15.5–17.0 mol % Al 2 O 3 , 9.5–11.0 mol % Na 2 O, 3.5–5.5 mol % K 2 O, 3.5–8.0 mol % CaO, 0.0–2.0 mol % MgO, 0.0–2.0 mol % SrO, and 0.0–2.0 mol % BaO.

22. The glass composition of claim 21 wherein MgO+SrO+BaO are present in a total amount of 0–3 mol %.

23. A glass substrate for an electronic display device, comprising 59–66 mol % SiO 2 , 14.5–18.0 mol % Al 2 O 3 , 8.5–12.0 mol % Na 2 O, 2.5–6.5 mol % K 2 O, 2.5–9.0 mol % CaO, 0.0–3.0 mol % MgO, 0.0–3.0 mol % SrO, 0.0–3.0 mol % BaO, and 0.0–5.0 mol % MgO+SrO+BaO.

24. A method of producing a glass panel for an electronic device, comprising:

melting a glass batch comprising 59–66 mol % SiO 2 , 14.5–18.0 mol % Al 2 O 3 , 8.5–12.0 mol % Na 2 O, 2.5–6.5 mol % K 2 O, 2.5–9.0 mol % CaO, 0.0–3.0 mol % MgO, 0.0–3.0 mol % SrO, 0.0–3.0 mol % BaO, and 0.0–5.0 mol % MgO+SrO+BaO; and

drawing a thin sheet of molten glass from the melt.

25. The method of claim 24 , wherein the glass sheet is drawn by the fusion draw process.

Continuity (2)
Continuation 1001630100 · Oct 30, 2001
Related Publication 20040224834A1 · Nov 11, 2004