Glass for chemical tempering
AssigneeAsahi Glass Company, Limited
InventorsJun ENDO, Shusaku Akiba, Kazutaka Ono, Shigeki Sawamura
Life of this patent
Estimating the term…
Abstract
A glass for chemical tempering is provided. The glass contains as represented by mole percentage based on the following oxides, from 61 to 77% of SiO2, from 11 to 18% of Al2O3, from 3 to 15% of MgO, from 0 to 0.5% of CaO, from 0 to 4% of ZrO2, from 8 to 18% of Na2O and from 0 to 1.9% of K2O; wherein an R value calculated by the following formula by using contents of the respective components, is at least 0.66: R=0.029×SiO2+0.021×Al2O3+0.016×MgO−0.004×CaO+0.016×ZrO2+0.029×Na2O+0×K2O−2.002
Claims9
(canceled)
A glass for chemical tempering, which comprises, as represented by mole percentage based on the following oxides,
- from 61 to 77% of SiO2,
- from 11 to 18% of Al2O3,
- from 3 to 15% of MgO,
- from 0 to 0.5% of CaO,
- from 0 to 4% of ZrO2,
- from 8 to 18% of Na2O and
- from 0 to 1.9% of K2O;
- wherein a value of R calculated by the following formula by using contents of the respective components, is at least 0.66:
- R=0.029×SiO2+0.021×Al2O3+0.016×MgO−0.004×CaO+0.016×ZrO2+0.029×Na2O+0×K2O−2.002.
Dependencies are inferred from the claim text.