Glass with improved total pitch stability

Patent metadata

Field	Value
Publication number	US-9328013-B2
Application number	US-201514728635-A
Country	US
Kind code	B2
Filing date	Jun 2, 2015
Priority date	Dec 21, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

Described herein are alkali-free, boroalumino silicate glasses exhibiting desirable physical and chemical properties for use as substrates in flat panel display devices, such as, active matrix liquid crystal displays (AMLCDs) and active matrix organic light emitting diode displays (AMOLEDs). In accordance with certain of its aspects, the glasses possess excellent compaction and stress relaxation properties.

First claim

What is claimed is:

1. A glass exhibiting the following performance criteria:
(a) compaction in the LTTC less than or equal to 4.6ppm;
(b) compaction in the HTTC less than or equal to 36 ppm; and
(c) less than 50% of an induced stress relaxed in the SRTC, the glass comprising, in mole percent on an oxide basis: SiO 2 50-85, Al 2 O 3 0-20, B 2 O 3 0-10, MgO 0-20, CaO 0-20, SrO 0-20, BaO 0-20, where SiO 2 , Al 2 O 3 , B 2 O 3 , MgO, CaO, SrO and BaO represent the mole percents of the oxide components.

2. The glass of claim 1 , wherein As 2 O 3 and Sb 2 O 3 comprise less than about 0.005 mol %.

3. The glass of claim 1 , wherein Li 2 O, Na 2 O, K 2 O, or combinations thereof, comprise less than about 0.1 mol % of the glass.

4. The glass of claim 1 , wherein 1.05 ≦(MgO+CaO+SrO+BaO)/Al 2 O 3 <1.4, where Al 2 O 3 , MgO, CaO, SrO and BaO represent the mole percents of the oxide components.

5. The glass of claim 1 having an anneal point in excess of 765° C.

6. The glass of claim 1 wherein T 35k −T liq >0.25T 35k −225° C.

7. The glass of claim 1 having a T 35k > 1310° C.

8. The glass of claim 1 having a CTE between 28-42×10 −7 /° C.

9. The glass of claim 1 having transmission at 300nm of greater than 50% at a thickness of 0.5mm.

10. The glass of claim 1 having a density between 2.3 and 2.6 g/cc.

11. The glass of claim 1 having a Young's’ modulus of between 75-85 GPa.

12. The glass of claim 1 , wherein less than 40% of an induced stress is relaxed in the SRTC.

13. A glass exhibiting the following performance criteria:
(a) compaction in the LTTC less than or equal to 5.5 ppm;
(b) compaction in the HTTC less than or equal to 40 ppm; and
(c) less than 50% of an induced stress relaxed in the SRTC;
the glass comprising, in mole percent on an oxide basis: SiO 2 50-85, Al 2 O 3 0-20, B 2 O 3 0-10, MgO 0-20, CaO 0-20, SrO 0-20, BaO 0-20, where SiO 2 , Al 2 O 3 , B 2 O 3 , MgO, CaO, SrO and BaO represent the mole percents of the oxide components,
wherein 1.05≦(MgO+CaO+SrO+BaO)/Al 2 O 3 ≦1.4.

14. The glass of claim 13 , wherein As 2 O 3 and Sb 2 O 3 comprise less than about 0.005 mol %.

15. The glass of claim 13 , wherein Li 2 O, Na 2 O, K 2 O, or combinations thereof, comprise less than about 0.1 mol % of the glass.

16. The glass of claim 13 having an anneal point in excess of 765° C.

17. The glass of claim 13 , wherein T 35k −T liq > 0.25T 35k −225° C.

18. The glass of claim 13 having a T 35k >1310° C.

19. The glass of claim 13 having a CTE between 28-42×10 −7 /° C.

20. The glass of claim 13 having transmission at 300 nm of greater than 50% at a thickness of 0.5 mm.

21. The glass of claim 13 having a density between 2.3 and 2.6 g/cc.

22. The glass of claim 13 having a Young's’ modulus of between 75-85 GPa.

23. The glass of claim 13 , wherein the compaction in the LTTC is less than or equal to 4.6 ppm.

24. The glass of claim 13 , wherein the compaction in the HTTC is less than or equal to 36 ppm.

25. The glass of claim 13 , wherein less than 40% of an induced stress is relaxed in the SRTC.

26. A glass exhibiting the following performance criteria:
A: Compaction in the LTTC less than or equal to 5.5 ppm
B: Compaction in the HTTC less than or equal to 40 ppm
C: Less than 50% of an induced stress relaxed in the SRTC,
wherein the glass has a Young's modulus of less than 87 GPa.

27. The glass of claim 26 comprising, in mole percent on an oxide basis: SiO 2 50-85, Al 2 O 3 0-20, B 2 O 3 0-10, MgO 0-20, CaO 0-20, SrO 0-20, BaO 0-20, where SiO 2 , Al 2 O 3 , B 2 O 3 , MgO, CaO, SrO and BaO represent the mole percents of the oxide components.

28. The glass of claim 26 , wherein As 2 O 3 and Sb 2 O 3 comprise less than about 0.005 mol %.

29. The glass of claim 26 , wherein Li 2 O, Na 2 O, K 2 O, or combinations thereof, comprise less than about 0.1 mol % of the glass.

30. The glass of claim 26 having an anneal point in excess of 765° C.

31. The glass of claim 26 wherein T 35k −T liq >0.25T 35k −225° C.

32. The glass of claim 26 having a T 35k >1310° C.

33. The glass of claim 26 having a CTE between 28-42×10 −7 /° C.

34. The glass of claim 26 having a density between 2.3 and 2.6 g/cc.

35. The glass of claim 26 having a Young's’ modulus of between 75-87 GPa.

36. The glass of claim wherein the compaction in the LTTC is less than or equal to 4.0 ppm.

37. The glass of claim 26 wherein the compaction in the HTTC is less than or equal to 36 ppm.

38. The glass of claim 26 wherein less than 40% of an induced stress is relaxed in the SRTC.

39. A glass exhibiting the following performance criteria:
A: Compaction in the LTTC less than or equal to 4.0 ppm
B: Compaction in the HTTC less than or equal to 40 ppm
C: Less than 50% of an induced stress relaxed in the SRTC.

40. The glass of claim 39 comprising, in mole percent on an oxide basis: SiO 2 50-85, Al 2 O 3 0-20, B 2 O 3 0-10, MgO 0-20, CaO 0-20, SrO 0-20, BaO 0-20, where SiO 2 , Al 2 O 3 , B 2 O 3 , MgO, CaO, SrO and BaO represent the mole percents of the oxide components.

41. The glass of claim 39 , wherein As 2 O 3 and Sb 2 O 3 comprise less than about 0.005 mol %.

42. The glass of claim 39 , wherein Li 2 O, Na 2 O, K 2 O, or combinations thereof, comprise less than about 0.1 mol % of the glass.

43. The glass of claim 39 having an anneal point in excess of 765° C.

44. The glass of claim 39 wherein T 35k −T liq >0.25T 35k ×225° C.

45. The glass of claim 39 having a T 35k >1310° C.

46. The glass of claim 39 having a CTE between 28-42×10 −7 /° C.

47. The glass of claim 39 having a density between 2.3 and 2.6 g/cc.

48. The glass of claim 39 having a Young's’ modulus of between 75-87 GPa.

49. The glass of claim 39 wherein the compaction in the HTTC is less than or equal to 36 ppm.

50. The glass of claim 39 wherein less than 40% of an induced stress is relaxed in the SRTC.

Assignees

• Corning Inc

Inventors

• Allan Douglas Clippinger
• Bowden Bradley Frederick
• Ellison Adam James
• Kiczenski Timothy James
• Potuzak Marcel

Classifications

• C03C3/091 Primary

  containing aluminium · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03B17/06

  Forming glass sheets · CPC title

• C03B17/064

  by the overflow downdraw fusion process; Isopipes therefor · CPC title