Process for producing alkali metal-rich aluminosilicate glasses, alkali metal-rich aluminosilicate glasses and use thereof
AssigneeSchott AG
InventorsChristof Kass, Rainer Eichholz
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Abstract
The invention relates to a process for producing alkali metal-rich aluminosilicate glasses having a content (in mol % based on oxide) of alkali metal oxides of 4-16 mol %, of Al2O3 of at least 4 mol % and of B2O3 of 0-4 mol %, wherein 0.15 mol % to 0.9 mol % of chloride(s) and at least one refining agent from the group of sulfate(s) (reported as SO3), CeO2 are added to the glass batch and wherein the sum total of refining agents added in the batch is 0.17 mol % to 1.3 mol %.
Claims8
Alkali metal-rich aluminosilicate glass comprising (in mol % based on oxides):
- SiO2
- 64-78
- Al2O3
- 4-14
- B2O3
- 0-4
- Na2O
- 4-14
- K2O
- 0-3
- Li2O
- 0-3
- with Na2O + K2O + Li2O
- 4-16
- MgO
- 0-14
- CaO
- 0-12
- BaO
- 0-4
- SrO
- 0-6
- TiO2
- 0-2
- ZrO2
- 0-1
- SnO2
- 0-0.4
- Cl
- 0.07-0.8
- CeO2
- 0.01-0.1
- SO3
- 0-0.01
- with SO3 + CeO2
- 0.01-0.11.
Alkali metal-rich aluminosilicate glass comprising (in mol % based on oxides) alkali metal oxides of 4-16 mol %, Al2O3 of at least 4 mol %, B2O3 of 0-4 mol %, and at least two refining agents comprising 0.07 to 0.8 mol % of chloride(s) and 0.01 to 0.1 mol % of CeO2.
Dependencies are inferred from the claim text.