Back to results
US 7,960,301 B2Granted
Glass composition
AssigneeAvanStrate Inc.
InventorsHaruki Niida, Akihiro Koyama, Yukihito Nagashima, Satoshi Furusawa
Life of this patent
Estimating the term…
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 comprises, 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; 0.001-0.5% Li2O; 0.01-0.5% Na2O; 0.002-0.5% K2O; and 0-1.0%, excluding 0%, Cl.
Claims19
A glass composition which comprises, in mass %,
- 40 to 70% SiO2,
- 5 to 20% B2O3,
- 10 to 25% Al2O3,
- 1 to 10% MgO,
- 0 to 20% CaO,
- 0 to 20% SrO,
- 0 to 10% BaO,
- 0.001 to 0.5% Li2O,
- 0.01 to 0.5% Na2O,
- greater than 0.03% and no greater than 0.5% K2O, and
- greater than 0% and no greater than 1.0% Cl,
- wherein a total content of Li2O, Na2O, and K2O is in a range of greater than 0.07 mass % and no greater than 1.5 mass %.
9 more elements
Dependencies are inferred from the claim text.