Red glass, process for manufacturing red glass, and tinted bulbs and tubes obtained with such a glass
AssigneeVermont
InventorsChristian Lefevre, Francois Lepesqueux
Life of this patent
Estimating the term…
Abstract
The invention relates to a bulk-tinted red glass formed from a glass batch based on a soda-lime-silica composition, to a process for manufacturing red glass and to a bulb obtained from a blank or a tube manufactured with such a glass. The batch comprises, per 100% by weight of the batch, 0.1 to 1% by weight of copper, 0.2 to 2% by weight of tin and 0.01 to 2.5% by weight of oxide of the lanthanide group and/or 0.01 to 0.5% by weight of silver in silver oxide or nitrate form.
Claims15
Bulk-tinted red glass formed from a glass batch based on a soda-lime-silica composition, characterized in that said batch comprises, per 100% by weight of the batch, 0.1 to 1% by weight of copper, 0.2 to 2% by weight of tin and 0.01 to 2.5% by weight of oxides of the lanthanide group and/or 0.01 to 0.5% by weight of silver in silver oxide or nitrate form.
Bulk-tinted red glass based on a soda-lime composition, comprising per 100% by weight of molten glass:
- SiO2:
- 69-75%
- Na2O:
- between 2 and 8%
- K2O:
- between 5 and 15%
- B2O3:
- between 0.5 and 4%
- LiO2:
- between 0.1 and 3%
- CaO:
- between 5 and 9%
- MgO:
- between 0.2 and 1%
- Al2O3:
- between 0.2 and 2%
- CuO:
- between 0.2 and 1.5%
- SnO:
- between 0.2 and 2%
- Cl:
- between 0.02 and 0.3%
- Er2O3:
- between 0.01 and 2.5%
- Nd2O3:
- between 0 and 2.5%
- Ag2O:
- between 0 and 0.5%
- being understood that at least one proportion of the copper is introduced in the form of cupric chloride (CuCl2), the role of which is to help in the refining and to improve the transmission.
Process for manufacturing a red glass from a batch based on a soda-lime-silica composition, characterized in that the following are added to the batch, per 100% by weight:
- 0.1 to 1% by weight of copper;
- 0.2 to 2% by weight of tin;
- and 0.01 to 2.5% by weight of lanthanide oxide and/or 0.1 to 0.5% by weight of silver in silver oxide or nitrate form.
Dependencies are inferred from the claim text.