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US 2026/0035286 A1Published application
Alkali-free glass and glass plate
AssigneeAGC Inc.
InventorsYusaku MATSUO, Hiroyuki HIJIYA, Yuya HAMADA, Yutaka KUROIWA
Life of this patent
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Abstract
An alkali-free glass includes, as represented by mol % based on oxides: 50 to 80% of SiO2; 2 to 6% of Al2O3; 18 to 35% of B2O3; 1 to 6% of MgO; 0 to 6% of CaO; 0 to 6% of SrO; and 0 to 3% of BaO. A formula (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the formula (A) is 2% or more and 6% or less. A formula (B) is [Al2O3]—([MgO]+[CaO]+[SrO]+[BaO]), and a value of the formula (B) is −3% or more and 2% or less.
Claims27
An alkali-free glass comprising, as represented by mol % based on oxides:
- 50 to 75% of SiO2;
- 2 to 6% of Al2O3;
- 21 to 35% of B2O3;
- 1 to 5.4% of MgO;
- 0 to 4.4% of CaO;
- 0.1 to 4.5% of SrO;
- 0 to 3% of BaO;
- and
- at least one selected from the group consisting of Li2O, Na2O, and K2O in an amount of 0 to 0.4% in total,
- wherein a formula (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the formula (A) is 2% or more and 5.5% or less, and
- a formula (B) is [Al2O3]—([MgO]+[CaO]+[SrO]+[BaO]), and a value of the formula (B) is −3% or more and 2% or less.
8 more elements
An alkali-free glass comprising, as represented by mol % based on oxides:
- 50 to 73% of SiO2;
- 2 to 6% of Al2O3;
- 21 to 35% of B2O3;
- 1 to 5.4% of MgO;
- 0 to 4.4% of CaO;
- 0.1 to 4.5% of SrO;
- 0 to 3% of BaO;
- and
- at least one selected from the group consisting of Li2O, Na2O, and K2O in an amount of 0 to 0.4% in total,
- wherein a formula (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the formula (A) is 2% or more and 5.5% or less, and
- a formula (B) is [Al2O3]—([MgO]+[CaO]+[SrO]+[BaO]), and a value of the formula (B) is −3% or more and 2% or less.
8 more elements
Dependencies are inferred from the claim text.