Glass composition and process for producing glass composition
AssigneeAvanStrate Inc.
InventorsShoichi Kishimoto, Haruki Niida, Akihiro Koyama, Yukihito Nagashima
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Abstract
A glass composition which is reduced in the amount of residual bubbles and is produced using smaller amounts of an environmentally unfriendly component such as arsenic oxide and antimony oxide. This glass composition contains, in terms of mass %: 40-70% SiO2; 5-20% B2O3; 10-25% Al2O3; 0-10% MgO; 0-20% CaO; 0-20% SrO; 0-10% BaO; 0-0.5% Li2O; 0-1.0% Na2O; 0-1.5% K2O; and 0-1.5%, excluding 0%, Cl, Li2O+Na2O+K2O exceeding 0.06%. The glass composition can be produced suitably using, for example, a chloride as part of the raw glass materials.
Claims23
A glass substrate consisting of a glass composition that comprises, in mass %,
- 40 to 70% SiO2,
- 5 to 20% B2O3,
- 10 to 25% Al2O3,
- 0 to 10% MgO,
- 0 to 10% CaO,
- 0 to 20% SrO, and
- 0 to 10% BaO,
- and further comprises greater than 0.06% R2O, and greater than 0% and no greater than 1.5% Cl,
- where R is at least one selected from Li, Na, and K, and Li2O falls in a range of 0 to 0.5%, Na2O falls in a range of 0 to 0.5%, and K2O falls in a range of 0.05 to 1.5%, all in mass %,
- wherein the content of K2O is at least two times the content of Na2O.
A process for producing a glass substrate consisting of a glass composition that comprises:
- melting a raw glass material to obtain the glass composition,
- wherein the glass composition comprises, in mass %,
- 40 to 70% SiO2,
- 5 to 20% B2O3,
- 10 to 25% Al2O3,
- 0 to 10% MgO,
- 0 to 10% CaO,
- 0 to 20% SrO, and
- 0 to 10% BaO,
- and the glass composition further comprises greater than 0.06% R2O, where R is at least one selected from Li, Na, and K, and Li2O falls in a range of 0 to 0.5%, Na2O falls in a range of 0 to 0.5%, and K2O falls in a range of 0.05 to 1.5%, all in mass %;
- wherein the content of K2O is at least two times the content of Na2O;
- and
- wherein a chloride is used as part of the raw glass material.
Dependencies are inferred from the claim text.