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US 8,283,270 B2Granted
Boron-poor neutral glass with titanium and zirconium oxides
AssigneeSchott AG
InventorsJoerg Hinrich Fechner, Christof Kass
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Abstract
The neutral glass according to the present invention is characterized by excellent hydrolytic stability, a relatively low processing temperature and low content of boron oxide. Here, the neutral glass has the following composition, in percent by weight based on oxide content: SiO2, 70-79; B2O3, 0-<5; Al2O3, <5; ZrO2, 0.5-<5; TiO2, 0.5-6; Na2O, 1-6; K2O, 3 to 8; and Li2O, 0-0.5, wherein a total amount of SiO2 and B2O3 is less than 83 percent by weight.
Claims16
A neutral glass having high hydrolytic stability with a composition comprising, in percent by weight based on oxide content:
- SiO2
- 70 to 79
- B2O3
- 0 to <5
- Al2O3
- 1 to <5
- ZrO2
- 0.5 to <5
- TiO2
- 0.5 to 6
- Na2O
- 1 to 6
- K2O
- 3 to 8
- Li2O
- 0 to 0.5,
- wherein a total amount of SiO2 and B2O3 in the composition is less than 83 percent by weight.
14 more elements
Dependencies are inferred from the claim text.