Strengthened glass plate and glass plate for strengthening
AssigneeNippon Electric Glass Co., Ltd.
InventorYuta Nagano
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Abstract
A tempered glass sheet of the present invention is a tempered glass sheet having a compressive stress layer in a surface thereof, wherein the tempered glass sheet comprises as a glass composition, in terms of mol %, 50% to 75% of SiO2, 1% to 20% of Al2O3, 5% to 30% of B2O3, 0% to 15% of Li2O, 1% to 25% of Na2O, 0% to 10% of K2O, and 0% to 15% of P2O5, wherein the tempered glass sheet has a molar ratio [Al2O3]/[Na2O] of from 0.1 to 2.5, and wherein the tempered glass sheet satisfies the following relationship: [SiO2]−3×[Al2O3]−[B2O3]−2×[Li2O]−1.5×[Na2O]−[K2O]+1.2×[P2O5]≥−20%.
Claims15
A tempered glass sheet having a compressive stress layer in a surface thereof,
- wherein the tempered glass sheet comprises as a glass composition, in terms of mol %, 50% to 75% of SiO2, 1% to 20% of Al2O3, 16% to 13% to 30% of B2O3, 0% to 1% of Li2O, 1% to 25% of Na2O, 0% to 10% of K2O, and 0% to 15% of P2O5,
- wherein the tempered glass sheet has a sheet thickness of 80 μm or less,
- wherein the tempered glass sheet has an internal tensile stress value that is 60 MPa or more,
- wherein the tempered glass sheet has a Young's modulus of 67 GPa or less,
- wherein the tempered glass sheet has a molar ratio [Al2O3]/[Na2O] of from 0.1 to 2.5, and
- wherein the tempered glass sheet satisfies the following molar relationship:
- [SiO2]−3×[Al2O3]−[B2O3]−2×[Li2O]−1.5×[Na2O]−[K2O]+1.2×[P2O5]≥−20%.
Dependencies are inferred from the claim text.