Tempered glass, and tempered glass plate
OwnerTakashi Murata, Takako Tojyoinventors
Life of this patent
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Abstract
Provided is a tempered glass having a compression stress layer in a surface thereof, comprising, as a glass composition in terms of mass %, 50 to 75% of SiO2, 5 to 20% of Al2O3, 0 to 8% of B2O3, 5 to 20% of Na2O, 0.1 to 10% of K2O, 0.1 to 15% of MgO, and 0.001 to 5% of SrO+BaO, and having a mass ratio (MgO+CaO+SrO+BaO)/(MgO+ZrO2) of 0.3 to 1.5.
Claims21
A tempered glass having a compression stress layer in a surface thereof, comprising, as a glass composition in terms of mass %, 50 to 75% of SiO2, 5 to 20% of Al2O3, 0 to 8% of B2O3, 5 to 20% of Na2O, 0.1 to 10% of K2O, 0.1 to 15% of MgO, and 0.001 to 5% of SrO+BaO, and having a mass ratio (MgO+CaO+SrO+BaO)/(MgO+ZrO2) of 0.3 to 1.5.
A tempered glass sheet, comprising, as a glass composition in terms of mass %, 50 to 70% of SiO2, 7 to 20% of Al2O3, 0 to 5% of B2O3, 8 to 20% of Na2O, 1 to 10% of K2O, 1.5 to 12% of MgO, 0.001 to 3% of SrO+BaO, and 100 ppm to 3,000 ppm of SnO2+SO3+Cl, having a mass ratio (MgO+CaO+SrO+BaO)/(MgO+ZrO2) of 0.4 to 1.4, and having a length of 500 mm or more, a width of 500 mm or more, a thickness of 1.5 mm or less, a Young's modulus of 65 GPa or more, a compression stress value of a compression stress layer of 400 MPa or more, and a thickness of a compression stress layer of 30 μm or more.
A glass to be tempered, comprising, as a glass composition in terms of mass %, 50 to 75% of SiO2, 5 to 20% of Al2O3, 0 to 8% of B2O3, 5 to 20% of Na2O, 0.1 to 10% of K2O, 0.1 to 15% of MgO, and 0.001 to 5% of SrO+BaO, and having a mass ratio (MgO+CaO+SrO+BaO)/(MgO+ZrO2) of 0.3 to 1.5.
Dependencies are inferred from the claim text.