USRE44869EActiveUtilityPatentIndex 83
Down-drawable, chemically strengthened glass for cover plate

Assignee: ELLISON ADAM JAMESPriority: May 18, 2007Filed: Feb 23, 2012Granted: Apr 29, 2014
Est. expiryMay 18, 2027(~0.9 yrs left)· nominal 20-yr term from priority
Inventors:ELLISON ADAM JAMES GOMEZ SINUE
C03C 3/087C03C 3/091Y02P40/57Y10T428/315C03C 3/085C03B 17/06C03C 21/002
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Claims
Abstract

An alkali aluminosilicate glass that is chemically strengthened and has a down-drawable composition. The glass has a melting temperature less than about 1650° C. and a liquidus viscosity of at least 130 kpoise and, in one embodiment, greater than 250 kpoise. The glass undergoes ion exchange at relatively low temperatures to a depth of at least 30 μm.
Claims

exact text as granted — not AI-modified
The invention claimed is: 
     
       1. An alkali aluminosilicate glass, the glass comprising:
 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 O≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; (Na 2 O+B 2 O 3 )—Al 2 O 3 ≦2 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise. 
 
     
     
       2. The glass according to  claim 1 , wherein the glass is down-drawable. 
     
     
       3. The glass according to  claim 1 , wherein the glass is substantially free of lithium. 
     
     
       4. The glass according to  claim 1 , wherein the glass is ion exchanged. 
     
     
       5. The glass according to  claim 4 , wherein the glass, when ion exchanged, has a surface compressive stress of the glass of at least about 200 MPa. 
     
     
       6. The glass according to  claim 4 , wherein the glass, when ion exchanged, has a surface compressive layer having a depth of at least about 30 μm. 
     
     
       7. The glass according to  claim 1 , wherein the glass has a liquidus viscosity of at least 250 kpoise. 
     
     
       8. The glass according to  claim 1 , wherein the glass has a thickness ranging from about 0.3 mm up to about 3 mm. 
     
     
       9. The glass according to  claim 8 , wherein the glass has a thickness ranging from about 0.3 mm up to about 1.5 mm. 
     
     
       10. The glass according to  claim 9 , wherein the glass has a warpage of less than about 0.5 mm, as determined for a 300 mm×400 mm sheet. 
     
     
       11. The glass according to  claim 10 , wherein the warpage is less than about 0.3 mm. 
     
     
       12. The glass according to  claim 1 , wherein the glass is a cover plate. 
     
     
       13. The glass according to  claim 12 , wherein the glass is a cover plate for a mobile electronic device. 
     
     
       14. The glass according to  claim 1 , wherein the glass is slot drawn or fusion drawn. 
     
     
       15. A lithium-free glass having a surface compressive stress of at least about 200 MPa, a surface compressive layer having a depth of at least in a range from about 30 40 μm up to about 100 μm, and a thicknessof thickness of at least about 0.3 mm. 
     
     
       16. The lithium-free glass according to  claim 15 , wherein the compressive stress is at least about 600 MPa, the depth of surface compressive layer is at least 40 μm, and the thickness is in a range from about 0.7 mm up to about 1.1 mm. 
     
     
       17. The lithium-free glass according to  claim 15 , wherein the glass comprises 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 ≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; (Na 2 O+B 2 O 3 )—Al 2 O 3 ≦2 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise. 
     
     
       18. The lithium-free glass according to  claim 17 , wherein the glass has a liquidus viscosity of at least 250 kpoise. 
     
     
       19. The lithium-free glass according to  claim 15 , wherein the glass has a thickness ranging from about 0.3 mm up to about 3 mm. 
     
     
       20. The lithium-free glass according to  claim 19 , wherein the glass has a thickness ranging from about 0.3 mm up to about 1.5 mm. 
     
     
       21. The lithium-free glass according to  claim 15 , wherein the glass is a cover plate. 
     
     
       22. The lithium-free glass according to  claim 15 , wherein the glass is a cover plate for a mobile electronic device. 
     
     
       23. The lithium-free glass according to  claim 15 , wherein the glass has a warpage of less than about 0.5 mm, as determined for a 300 mm×400 mm sheet. 
     
     
       24. The lithium-free glass according to  claim 15 , wherein the warpage is less than about 0.3 mm. 
     
     
       25. The lithium-free glass according to  claim 15 , wherein the lithium-free glass is fusion drawn or slot drawn. 
     
     
       26. A mobile electronic device, the mobile electronic device comprising an alkali aluminosilicate glass cover plate, the glass cover plate comprising: 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 O≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; (Na 2 O+B 2 O 3 )—Al 2 O 3 ≦2 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise. 
     
     
       27. The mobile electronic device according to  claim 26 , wherein the glass cover plate is substantially free of lithium. 
     
     
       28. The mobile electronic device according to  claim 26 , wherein the glass cover plate is ion exchanged. 
     
     
       29. The mobile electronic device according to  claim 28 , wherein the glass cover plate, when ion exchanged, has a surface compressive stress at a surface of the glass of at least 200 MPa. 
     
     
       30. The mobile electronic device according to  claim 28 , wherein the glass cover plate, when ion exchanged, has a compressive surface layer having a depth of at least about 30 μm. 
     
     
       31. The mobile electronic device according to  claim 26 , wherein the glass cover plate has a liquidus viscosity of at least 250 kpoise. 
     
     
       32. The mobile electronic device according to  claim 26 , wherein the glass cover plate has a thickness ranging from about 0.3 mm up to about 3 mm. 
     
     
       33. The mobile electronic device according to  claim 32 , wherein the glass cover plate has a thickness ranging from about 0.3 mm up to about 1.5 mm. 
     
     
       34. The mobile electronic device according to  claim 32 , wherein the glass cover plate has a warpage of less than about 0.5 mm, as determined for a 300 mm×400 mm sheet. 
     
     
       35. The mobile electronic device according to  claim 34 , wherein the warpage is less than about 0.3 mm. 
     
     
       36. The mobile electronic device according to  claim 26 , wherein the glass is fusion drawn or slot-drawn. 
     
     
       37. An alkali aluminosilicate glass cover plate, the cover plate comprising:
 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 O≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; (Na 2 O+B 2 O 3 )—Al 2 O 3 ≦2 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise. 
 
     
     
       38. The cover plate according to  claim 37 , wherein the cover plate is substantially free of lithium. 
     
     
       39. The cover plate according to  claim 37 , wherein the cover plate is ion exchanged. 
     
     
       40. The cover plate according to  claim 39 , wherein the cover plate, when ion exchanged, has a surface compressive stress at a surface of the glass of at least about 200 MPa. 
     
     
       41. The cover plate according to  claim 39 , wherein the cover plate, when ion exchanged, has a compressive surface layer having a depth of at least about 30 μm. 
     
     
       42. The cover plate according to  claim 37 , wherein the cover plate has a liquidus viscosity of at least 250 kpoise. 
     
     
       43. The cover plate according to  claim 37 , wherein the cover plate has a thickness ranging from about 0.3 mm up to about 3 mm. 
     
     
       44. The cover plate according to  claim 43 , wherein the cover plate has a thickness ranging from about 0.3 mm up to about 1.5 mm. 
     
     
       45. The cover plate according to  claim 43 , wherein the cover plate has a warpage of less than about 0.5 mm, as determined for a 300 mm×400 mm sheet. 
     
     
       46. The cover plate according to  claim 45 , wherein the warpage is less than about 0.3 mm. 
     
     
       47. The cover plate according to  claim 37 , wherein the glass is fusion drawn or slot-drawn. 
     
     
       48. An alkali aluminosilicate glass, the glass comprising:
 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 O≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.   
     
     
       49. A mobile electronic device, the mobile electronic device comprising an alkali aluminosilicate glass cover plate, the glass cover plate comprising:
 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 O≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.   
     
     
       50. An alkali aluminosilicate glass cover plate, the cover plate comprising:
 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 O≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.   
     
     
       51. The lithium-free glass according to claim 15, wherein the glass has a liquidus viscosity of at least 130 kpoise. 
     
     
       52. The lithium-free glass according to claim 15, wherein the glass has a liquidus viscosity of at least 250 kpoise. 
     
     
       53. The lithium-free glass according to claim 51, wherein the compressive stress is at least about 600 MPa, the depth of surface compressive layer is at least 40 μm, and the thickness is in the range from about 0.7 mm up to about 1.1 mm. 
     
     
       54. The lithium-free glass according to claim 51, wherein the glass comprises:
 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 O≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %.   
     
     
       55. The lithium-free glass according to claim 54, wherein the glass has a liquidus viscosity of at least 250 kpoise. 
     
     
       56. The lithium-free glass according to claim 51, wherein the glass has a thickness ranging from about 0.3 mm up to about 3 mm. 
     
     
       57. The lithium-free glass according to claim 56, wherein the glass has a thickness ranging from about 0.3 mm up to about 1.5 mm. 
     
     
       58. The lithium-free glass according to claim 51, wherein the glass is a cover plate. 
     
     
       59. The lithium-free glass according to claim 51, wherein the glass is a cover plate for a mobile electronic device. 
     
     
       60. The lithium-free glass according to claim 51, wherein the glass has a warpage of less than about 0.5 mm, as determined for a 300 mm×400 mm sheet. 
     
     
       61. The lithium-free glass according to claim 51, wherein the warpage is less than about 0.3 mm. 
     
     
       62. The lithium-free glass according to claim 51, wherein the lithium-free glass is fusion drawn or slot drawn. 
     
     
       63. A glass substantially free of lithium having a surface compressive stress of at least about 200 MPa, a surface compressive layer having a depth of at least in a range from 40 μm up to about 100 μm, and a thickness of at least about 0.3 mm. 
     
     
       64. The glass substantially free of lithium according to claim 63, wherein the glass has a liquidus viscosity of at least 130 kpoise. 
     
     
       65. The glass substantially free of lithium according to claim 63, wherein the glass has a liquidus viscosity of at least 250 kpoise. 
     
     
       66. The glass substantially free of lithium according to claim 63, wherein the compressive stress is at least about 600 MPa, the depth of surface compressive layer is at least 40 μm, and the thickness is in the range from about 0.7 mm up to about 1.1 mm. 
     
     
       67. The glass substantially free of lithium according to claim 63, wherein the glass comprises:
 64 mol %≦SiO 2 ≦68 mol %; 12 mol %≦Na 2 O≦16 mol %; 8 mol %≦Al 2 O 3 ≦12 mol %; 0 mol %≦B 2 O 3 ≦3 mol %; 2 mol %≦K 2 O≦5 mol %; 4 mol %≦MgO≦6 mol %; and 0 mol %≦CaO≦5 mol %, wherein: 66 mol %≦SiO 2 +B 2 O 3 +CaO≦69 mol %; Na 2 O+K 2 O+B 2 O 3 +MgO+CaO+SrO&gt;10 mol %; 5 mol %≦MgO+CaO+SrO≦8 mol %; 2 mol %≦Na 2 O—Al 2 O 3 ≦6 mol %; and 4 mol %≦(Na 2 O+K 2 O)—Al 2 O 3 ≦10 mol %, and wherein the glass has a liquidus viscosity of at least 130 kpoise.   
     
     
       68. The glass substantially free of lithium according to claim 67, wherein the glass has a liquidus viscosity of at least 250 kpoise. 
     
     
       69. The glass substantially free of lithium according to claim 63, wherein the glass has a thickness ranging from about 0.3 mm up to about 3 mm. 
     
     
       70. The glass substantially free of lithium according to claim 69, wherein the glass has a thickness ranging from about 0.3 mm up to about 1.5 mm. 
     
     
       71. The glass substantially free of lithium according to claim 63, wherein the glass is a cover plate. 
     
     
       72. The glass substantially free of lithium according to claim 63, wherein the glass is a cover plate for a mobile electronic device. 
     
     
       73. The glass substantially free of lithium according to claim 63, wherein the glass has a warpage of less than about 0.5 mm, as determined for a 300 mm×400 mm sheet. 
     
     
       74. The glass substantially free of lithium according to claim 63, wherein the warpage is less than about 0.3 mm. 
     
     
       75. The glass substantially free of lithium according to claim 63, wherein the glass is fusion drawn or slot drawn.
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