Back to results
US 12,479,754 B2Granted
Alkali-free glass and glass plate
AssigneeAGC Inc.
InventorsYusaku Matsuo, Kazutaka Ono
Life of this patent
Estimating the term…
Abstract
An alkali-free glass includes, as represented by mole percentage based on oxides, SiO2: 57 to 70%, Al2O3: 5 to 15%, B2O3: 15 to 24%, MgO: 0.2 to 10%, CaO: 0.1 to 7%, SrO: 0.1 to 2.5%, BaO: 0 to 10%, and ZnO: 0 to 0.1%, or includes, as represented by mole percentage based on oxides, SiO2: 57 to 70%, Al2O3: 5 to 15%, B2O3: 15 to 24%, MgO: 0.1 to 10%, CaO: 0.1 to 10%, SrO: 0.1 to 10%, BaO: 0.1 to 10%, and ZnO: 0 to 0.1%. Formula (A) is [Al2O3]/[B2O3], and a value of the formula (A) is larger than 0.35 and 1.4 or smaller.
Claims28
An alkali-free glass, comprising:
- a first glass having a composition comprising, by mole percentage based on oxides,
- 57 to 70% of SiO2,
- 5 to 15% of Al2O3,
- 15 to 24% of B2O3,
- 0.2 to 1.306% of MgO,
- 0.1 to 1.206% of CaO,
- 0.533 to 2.5% of SrO,
- 0 to 1.106% of BaO, and
- to 0.1% of ZnO;
- or
- a second glass having a composition comprising, by mole percentage based on oxides,
- 57 to 70% of SiO2,
- 5 to 15% of Al2O3,
- 15 to 24% of B2O3,
- 0.1 to 5.425% of MgO,
- 0.1 to 5.425% of CaO,
- 0.533 to 10% of SrO,
- 0.1 to 5.425% of BaO, and
- to 0.1% of ZnO,
- wherein Al2O3/B2O3 in the composition of the first glass and the second glass is larger than 0.35 and 1.0 or smaller, and
- SrO/(MgO+CaO+SrO+BaO) in the composition of the first glass and the second glass is 0.64 or larger.
18 more elements
Dependencies are inferred from the claim text.