Glass for display device and glass plate
View Patent ↗Glass for a display device, which comprises, as represented by mole percentage based on the following oxides, from 61 to 72% of SiO 2 , from 8 to 17% of Al 2 O 3 , from 6 to 18% of Li 2 O, from 2 to 15% of Na 2 O, from 0 to 8% of K 2 O, from 0 to 6% of MgO, from 0 to 6% of CaO, from 0 to 4% of TiO 2 , and from 0 to 2.5% of ZrO 2 , and having a total content R 2 O of Li 2 O, Na 2 O and K 2 O of from 15 to 25%, a ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O of from 0.35 to 0.8, and a total content of MgO and CaO of from 0 to 9%.
1. Glass for a display device, which comprises, as represented by mole percentage based on the following oxides, from 61 to 72% of SiO 2 , from 8 to 17% of Al 2 O 3 , from 6 to 18% of Li 2 O, from 2 to 15% of Na 2 O, from 0 to 8% of K 2 O, from 0 to 6% of MgO, from 0 to 6% of CaO, from 0 to 4% of TiO 2 , and from 0 to 2.5% of ZrO 2 , and having a total content R 2 O of Li 2 O, Na 2 O and K 2 O of from 15 to 25%, a ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O of from 0.59 to 0.8, and a total content of MgO and CaO of from 0 to 9%, wherein the glass contains no BaO, and
wherein the glass has a compressive strength of 250 to less than 1,200 MPa.
2. The glass for a display device according to claim 1 , which contains at most 68% of SiO 2 , at most 15% of Al 2 O 3 , at most 16% of Li 2 O, at most 13% of Na 2 O, at most 7% of K 2 O, from 0 to 5% of MgO, from 0 to 5% of CaO, and from 0 to 2% of TiO 2 , and has R 2 O of from 16 to 23%.
3. The glass for a display device according to claim 1 , which contains at most 70% of SiO 2 , at most 15% of Al 2 O 3 , at least 10% of Li 2 O, at most 10% of Na 2 O, and from 0 to 6% of K 2 O, and has R 2 O of at most 22% and Li 2 O/R 2 O of 0.6 to 0.8.
4. The glass for a display device according to claim 1 , which contains at most 68% of SiO 2 , at most 15% of Al 2 O 3 , at least 12% of Li 2 O, at most 6% of Na 2 O, from 0 to 3% of K 2 O, at least 1% of MgO, from 0 to 2% of CaO, and from 0 to 1% of TiO 2 , and has R 2 O of at most 22% and Li 2 O/R 2 O of 0.7 to 0.8.
5. The glass for a display device according to claim 1 , which has a fracture toughness value of at least 0.85 MPa·m 1/2 .
6. A glass plate made of the glass for a display device as defined in claim 1 , produced by a float process or a fusion method.
7. A glass plate for a display device, obtained by subjecting a glass plate made of the the glass for a display device as defined in claim 1 to chemical tempering treatment.
8. The glass plate for a display device according to claim 7 , wherein the glass plate is produced by a float process or a fusion method, and the surface is a fire polished surface.
9. The glass plate for a display device according to claim 7 , which has a fracture toughness value of at least 1.0 MPa·m 1/2 .
10. A method for producing a glass plate for a display device, which comprises immersing a glass plate made of glass for a display device comprising, as represented by mole percentage based on the following oxides, from 61 to 72% of SiO 2 , from 8 to 17% of Al 2 O 3 , from 6 to 18% of Li 2 O, from 2 to 15% of Na 2 O, from 0 to 8% of K 2 O, from 0 to 6% of MgO, from 0 to 6% of CaO, from 0 to 4% of TiO 2 , and from 0 to 2.5% of ZrO 2 , and having a total content R 2 O of Li 2 O, Na 2 O and K 2 O of from 15 to 25%, a ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O of from 0.59 to 0.8, and a total content of MgO and CaO of from 0 to 9%, wherein the glass contains no BaO, in a molten salt to carry out chemical tempering treatment, wherein the molten salt comprises, as represented by mole percentage, from 0 to 7% of LiNO 3 , from 60 to 100% of NaNO 3 , and from 0 to 40% of KNO 3 , and
wherein the glass has a compressive strength of 250 to less than 1,200 MPa.
11. The method for producing a glass plate for a display device according to claim 10 , wherein the chemical tempering treatment is carried out by immersing the glass plate in the molten salt at a temperature of at most 425° C. for an immersion time of at most 2 hours.
12. A display device having a cover glass, wherein the cover glass is the glass plate for a display device as defined in claim 7 .
13. A portable device containing the display device as defined in claim 12 .
14. A television containing the display device as defined in claim 12 .
15. A touch panel containing the display device as defined in claim 12 .
16. A chassis for a display device, in which a display device is contained, which has the glass plate for a display device as defined in claim 7 .
17. Glass for a display device, which comprises, as represented by mole percentage based on the following oxides, from 61 to 72% of SiO 2 , from 8 to 17% of Al 2 O 3 from 6 to 18% of Li 2 O, from 2 to 8% of Na 2 O, from 0 to 8% of K 2 O, from 0 to 6% of MgO, from 0 to 6% of CaO, from 0 to 4% of TiO 2 , and from 0 to 2.5% of ZrO 2 , and having a total content R 2 O of Li 2 O, Na 2 O and K 2 O of from 15 to 25%, a ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O of from 0.59 to 0.8, and a total content of MgO and CaO of from 0 to 9%, and
wherein the glass has a compressive strength of 250 to less than 1,200 MPa.
18. The glass for a display device according to claim 17 , which contains at most 68% of SiO 2 , at most 15% of Al 2 O 3 , at most 16% of Li 2 O, from 2% to 8% of Na 2 O, at most 7% of K 2 O, from 0 to 5% of MgO, from 0 to 5% of CaO, and from 0 to 2% of TiO 2 , and has R 2 O of from 16 to 23%.
19. The glass for a display device according to claim 17 , which contains at most 70% of SiO 2 , at most 15% of Al 2 O 3 , at least 10% of Li 2 O, at most 8% of Na 2 O, and from 0 to 6% of K 2 O, and has R 2 O of at most 22% and Li 2 O/R 2 O of 0.6 to 0.8.
20. The glass for a display device according to claim 17 , which contains at most 68% of SiO 2 , at most 15% of Al 2 O 3 , at least 12% of Li 2 O, at most 6% of Na 2 O, from 0 to 3% of K 2 O, at least 1% of MgO, from 0 to 2% of CaO, and from 0 to 1% of TiO 2 , and has R 2 O of at most 22% and Li 2 O/R 2 O of 0.7 to 0.8.
21. The glass for a display device according to claim 17 , which has a fracture toughness value of at least 0.85 MPa·m 1/2 .
22. A glass plate made of the glass for a display device as defined in claim 17 , produced by a float process or a fusion method.
23. A glass plate for a display device, obtained by subjecting a glass plate made of the glass for a display device as defined in claim 17 to chemical tempering treatment.
24. The glass plate for a display device according to claim 23 , wherein the glass plate is produced by a float process or a fusion method, and the surface is a fire polished surface.
25. The glass plate for a display device according to claim 23 , which has a fracture toughness value of at least 1.0 MPa·m 1/2 .
26. A method for producing a glass plate for a display device, which comprises immersing a glass plate made of glass for a display device comprising, as represented by mole percentage based on the following oxides, from 61 to 72% of SiO 2 , from 8 to 17% of Al 2 O 3 , from 6 to 18% of Li 2 O, from 2 to 8% of Na 2 O, from 0 to 8% of K 2 O, from 0 to 6% of MgO, from 0 to 6% of CaO, from 0 to 4% of TiO 2 , and from 0 to 2.5% of ZrO 2 , and having a total content R 2 O of Li 2 O, Na 2 O and K 2 O of from 15 to 25%, a ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O of from 0.59 to 0.8, and a total content of MgO and CaO of from 0 to 9%, in a molten salt to carry out chemical tempering treatment, wherein the molten salt comprises, as represented by mole percentage, from 0 to 7% of LiNO 3 , from 60 to 100% of NaNO 3 , and from 0 to 40% of KNO 3 , and
wherein the glass has a compressive strength of 250 to less than 1,200 MPa.
27. The method for producing a glass plate for a display device according to claim 26 , wherein the chemical tempering treatment is carried out by immersing the glass plate in the molten salt at a temperature of at most 425° C. for an immersion time of at most 2 hours.
28. A display device having a cover glass, wherein the cover glass is the glass plate for a display device as defined in claim 23 .
29. A portable device containing the display device as defined in claim 28 .
30. A television containing the display device as defined in claim 28 .
31. A touch panel containing the display device as defined in claim 28 .
32. A chassis for a display device, in which a display device is contained, which has the glass plate for a display device as defined in claim 23 .
33. The glass for a display device according to claim 1 , wherein the ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O is from 0.6 to 0.8.
34. The method for producing a glass plate for a display device according to claim 10 , wherein the ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O is from 0.6 to 0.8.
35. The glass for a display device according to claim 17 , wherein the ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O is from 0.6 to 0.8.
36. The method for producing a glass plate for a display device according to claim 26 , wherein the ratio Li 2 O/R 2 O of the Li 2 O content to R 2 O is from 0.6 to 0.8.