TEMPERED GLASS AND TEMPERED GLASS SHEET
First Claim
1. A tempered glass having a compression stress layer in a surface thereof, comprising, as a glass composition in terms of mol %, 50 to 75% of SiO2, 3 to 13% of Al2O3, 0 to 1.5% of B2O3, 0 to 4% of Li2O, 7 to 20% of Na2O, 0 to 10% of K2O, 0.5 to 13% of MgO, 0 to 6% of CaO, and 0 to 4.5% of SrO, and being substantially free of As2O3, Sb2O3, PbO, and F.
1 Assignment
0 Petitions
Accused Products
Abstract
Provided is a tempered glass having a compression stress layer in a surface thereof, comprising, as a glass composition in terms of mol %, 50 to 75% of SiO2, 3 to 13% of Al2O3, 0 to 1.5% of B2O3, 0 to 4% of Li2O, 7 to 20% of Na2O, 0 to 10% of K2O, 0.5 to 13% of MgO, 0 to 6% of CaO, and 0 to 4.5% of SrO, and being substantially free of As2O3, Sb2O3, PbO, and F.
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Citations
24 Claims
- 1. A tempered glass having a compression stress layer in a surface thereof, comprising, as a glass composition in terms of mol %, 50 to 75% of SiO2, 3 to 13% of Al2O3, 0 to 1.5% of B2O3, 0 to 4% of Li2O, 7 to 20% of Na2O, 0 to 10% of K2O, 0.5 to 13% of MgO, 0 to 6% of CaO, and 0 to 4.5% of SrO, and being substantially free of As2O3, Sb2O3, PbO, and F.
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17. A tempered glass sheet having a compression stress in a surface thereof, the tempered glass sheet having a length of 500 mm or more, a width of 500 mm or more, a thickness of 0.5 to 1.5 mm, a Young'"'"'s modulus of 65 GPa or more, a compression stress value of a compression stress layer of 200 MPa or more, a thickness of a compression stress layer of 20 μ
- m or more, a degradation coefficient D of 0.6 or less, and a Δ
CS value of 50 MPa or less, the Δ
CS value being a difference in compression stress value between compression stress layers in surfaces opposite to each other. - View Dependent Claims (18, 19, 20, 21)
- m or more, a degradation coefficient D of 0.6 or less, and a Δ
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22. A tempered glass sheet having a compression stress in a surface thereof, the tempered glass sheet comprising, as a glass composition in terms of mol %, 50 to 75% of SiO2, 4 to 12% of Al2O3, 0 to 1% of B2O3, 0 to 1% of Li2O, 10 to 17% of Na2O, 0 to 7% of K2O, 1.5 to 12% of MgO, 0 to 3% of CaO, 0 to 1% of SrO, and 0 to 0.5% of TiO2, and having a molar ratio MgO/(MgO+CaO) of 0.5 or more, a length of 500 mm or more, a width of 500 mm or more, a thickness of 0.5 to 1.5 mm, a Young'"'"'s modulus of 65 GPa or more, a compression stress value of a compression stress layer of 400 MPa or more, a thickness of a compression stress layer of 30 μ
- m or more, and a degradation coefficient D of 0.4 or less.
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23. A glass to be tempered to be subjected to tempering treatment, comprising, as a glass composition in terms of mol %, 50 to 75% of SiO2, 3 to 13% of Al2O3, 0 to 1.5% of B2O3, 0 to 4% of Li2O, 7 to 20% of Na2O, 0 to 10% of K2O, 0.5 to 13% of MgO, 0 to 6% of CaO, and 0 to 4.5% of SrO, and being substantially free of As2O3, Sb2O3, PbO, and F.
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24. A glass sheet to be tempered, comprising a glass to be tempered to be subjected to tempering treatment, wherein the glass sheet to be tempered has a thickness of 1.5 mm or less, and has an Fmax value of 5 MPa or less, the Fmax value being a maximum value of residual stresses in a planar direction with respect to all planar portions of the glass to be tempered.
Specification