GLASS COMPOSITION, GLASS SHEET FOR CHEMICAL STRENGTHENING, STRENGTHENED GLASS SHEET, AND STRENGTHENED GLASS SUBSTRATE FOR DISPLAY

摘要

The glass composition of the present invention contains, in mol %: 58% or more and less than 70% SiO₂; 0 to 14% B₂O₃; 10 to 16% Al₂O₃; 0 to 12.5% MgO; 0 to 11% CaO; 0 to 3% SrO; 0 to 3% ZnO; 4.5 to 11% Li₂O; 0 to 2% Na₂O; 2 to 7% K₂O; 0 to 0.8% TiO₂; 0 to 0.5% ZrO₂; and 0 to 0.2% SnO₂. In this glass composition, the total content of Li₂O, Na₂O, and K₂O is in a range of 6.5 to 13%. The glass composition of the present invention is suitable for production by a float process and is suitable for chemical strengthening. The glass composition of the present invention has a low thermal expansion coefficient. The glass composition of the present invention has properties suitable for use in glass substrates for displays.