초록 ▼

An alkali-free glass of the present invention comprises, as a glass composition expressed in terms of oxides by mass %, 45 to 70% of SiO2, 10 to 30% of Al2O3, 11 to 20% of B2O3, less than 0.1% of As2O3, less than 0.1% of Sb2O3, and less than 0.1% of an alkali metal oxide, and has a thermal expansion

An alkali-free glass of the present invention comprises, as a glass composition expressed in terms of oxides by mass %, 45 to 70% of SiO2, 10 to 30% of Al2O3, 11 to 20% of B2O3, less than 0.1% of As2O3, less than 0.1% of Sb2O3, and less than 0.1% of an alkali metal oxide, and has a thermal expansion coefficient (30 to 380° C.) of 30 to 35×10−7/° C.

대표청구항 ▼

1. A glass, comprising, as a glass composition expressed in terms of oxides by mass %, 45 to 70% of SiO2, 10 to 30% of Al2O3, 13 to 20% of B2O3, 0 to 1% of MgO, 0 to 0.02% of TiO2, less than 0.1% of As2O3, less than 0.1% of Sb2O3, less than 0.01% of Cl, and 0.01 to less than 1% of alkali metal oxide

1. A glass, comprising, as a glass composition expressed in terms of oxides by mass %, 45 to 70% of SiO2, 10 to 30% of Al2O3, 13 to 20% of B2O3, 0 to 1% of MgO, 0 to 0.02% of TiO2, less than 0.1% of As2O3, less than 0.1% of Sb2O3, less than 0.01% of Cl, and 0.01 to less than 1% of alkali metal oxide, wherein a mass ratio of MgO/B2O3 is less than 0.05, and wherein the glass has a thermal expansion coefficient (30 to 380° C.) of 30 to 35×10−7/° C. 2. The glass according to claim 1, comprising, as a glass composition expressed in terms of oxides by mass %, 50 to 70% of SiO2, 11 to 23% of Al2O3, 13 to 20% of B2O3, 0 to 1% of MgO, 1 to 10% of CaO, 0 to 2% of SrO, 0 to 2% of BaO, 5 to 12% of MgO+CaO+SrO+BaO, 0 to 0.02% of TiO2, 0.001 to 1% of SnO2, less than 0.05% of As2O3, less than 0.05% of Sb2O3, less than 0.1% of F, less than 0.01% of Cl, and 0.01 to less than 1% of alkali metal oxide, wherein the glass has a thermal expansion coefficient (30 to 380° C.) of 30 to 35×10−7/° C. 3. The glass according to claim 1, comprising, as a glass composition expressed in terms of oxides by mass %, 50 to 70% of SiO2, 11 to 16% of Al2O3, 13 to 19% of B2O3, 0 to less than 0.95% of MgO, 4 to 9% of CaO, 0 to 1% of SrO, 0 to 1% of BaO, 7 to 10% of MgO+CaO+SrO+BaO, 0 to 0.02% of TiO2, 0.01 to 0.5% of SnO2, less than 0.05% of As2O3, less than 0.05% of Sb2O3, less than 0.1% of F, less than 0.01% of Cl, and 0.01 to less than 1% of alkali metal oxide, wherein the glass has a thermal expansion coefficient (30 to 380° C.) of 30 to 35×10−7/° C. 4. The glass according to claim 1, wherein the glass is formed by an overflow down-draw method or a slot down-draw method. 5. The glass according to claim 1, wherein the glass has a plate shape. 6. The glass according to claim 5, wherein the glass has a thickness of 0.6 mm or less. 7. The glass according to claim 1, wherein the glass is used for a chip size package. 8. The glass according to claim 1, wherein the glass is used for an OLED display. 9. A glass, comprising, as a glass composition expressed in terms of oxides by mass %, 45 to 70% of SiO2, 10 to 30% of Al2O3, 13 to 20% of B2O3, 0 to 1% of MgO, 3 to 12% of CaO, less than 0.5% of BaO, 0 to 0.02% of TiO2, less than 0.01% of As2O3, less than 0.05% of Sb2O3, less than 0.05% of F, less than 0.01% of Cl, and 0.01 to less than 1% of alkali metal oxide, wherein a mass ratio of MgO/B2O1 is less than 0.05, and wherein the glass has a thermal expansion coefficient (30 to 380° C.) of 33 to 35×10−7/° C., a spectral transmittance at a wavelength of 300 to 800 nm of 85% or more, and an amount of αrays emitted of 5000×10−4 C/cm2/h or less.