Glass to be tempered
AssigneeAsahi Glass Company, Limited
InventorsAkio KOIKE, Setsuro Ito
Life of this patent
Estimating the term…
Abstract
The present invention provides a glass plate to be tempered, which has a low thermal expansion coefficient, a high surface compression stress due to physical reinforcements and a low density and is excellent in the scratch durability. A glass plate to be tempered which comprises, by mass % as represented by the following composition: SiO2: 55 to 85%, B2O3: 2 to 12%, MgO: 0.1 to 12%, CaO: 0.1 to 12%, Na2O: 0 to 13%, MgO+CaO+SrO+ZnO: 3 to 16% and Al2O3: 0 to 3% and, which can be tempered by heating and quenching.
Claims10
A glass plate to be tempered which comprises, by mass percentage as represented by the following oxides:
- SiO2:
- 55 to 85%,
- B2O3:
- 2 to 12%,
- MgO:
- 0.1 to 12%,
- CaO:
- 0.1 to 12%,
- Na2O:
- 0 to 13%,
- MgO+CaO+SrO+ZnO:
- 3 to 16% and
- Al2O3:
- 0 to 3% and,
- which can be tempered by heating and quenching.
A glass plate to be tempered which comprises, by mass percentage as represented by the following oxides:
- SiO2:
- 55 to 85%,
- B2O3:
- 2 to 12%,
- MgO:
- 0.1 to 12%,
- CaO:
- 0.1 to 12%,
- Na2O:
- 0 to 13%,
- MgO+CaO+SrO+ZnO:
- 3 to 12% and
- Al2O3:
- 0 to 3% and,
- which can be tempered by heating and quenching.
A glass plate to be tempered which comprises, by mass percentage as represented by the following oxides:
- SiO2:
- 60 to 80%,
- B2O3:
- 2 to 10%,
- MgO:
- 0.5 to 8%,
- CaO:
- 2 to 12%,
- Na2O:
- 2 to 12%,
- K2O:
- 0.5 to 10%,
- MgO+CaO+SrO+ZnO:
- 3 to 14%,
- Al2O3:
- 0 to 1.5% and
- Fe2O3:
- 0.01 to 1.0%, and
- which can be tempered by heating and quenching.
Dependencies are inferred from the claim text.