Silico-sodo-calcic glass composition for the production of substrates
AssigneeSaint-Gobain Glass France
InventorCatherine GOULAS
Life of this patent
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Abstract
The present invention relates to a glass composition intended for the manufacture of thermally stable substrates or plates that comprises the constituents given below, in the following proportions by weight: SiO2 67-75% Al2O3 0.5-1% ZrO2 2-7% Na2O 2-9% K2O 4-11% MgO 0-5% CaO 5-10% SrO 5-12% BaO 0-3% B2O3 0-3% Li2O 0-2% with the relationships: Na2O+K2O>10% MgO+CaO+SrO+BaO>12% and said composition having a thermal expansion coefficient between 80 and 90×10−7/° C. It also relates to the use of these glass compositions for the production of substrates, especially for emissive displays and for fire-resistant glazing.
Claims26
A glass substrate for an emissive display, wherein a glass comprises a composition comprising the constituents below, in the following proportions by weight:
- SiO2
- 67-75%
- Al2O3
- 0.5-1%
- ZrO2
- 2-7%
- Na2O
- 2-9%
- K2O
- 4-11%
- MgO
- 0-5%
- CaO
- 5-10%
- SrO
- 5-12%
- BaO
- 0-3%
- B2O3
- 0-3%
- Li2O
- 0-2%
- with the relationships
- Na2O+K2O>10%
- MgO+CaO+SrO+BaO>12% and said composition having a thermal expansion coefficient between 80 and 90×10−7/° C.
A glass substrate for an emissive display, wherein a glass comprises a composition comprising the constituents below, in the following proportions by weight:
- SiO2
- 67.5-75%
- Al2O3
- 0.5-1%
- ZrO2
- 2-7%
- Na2O
- 2-9%
- K2O
- 4-11%
- MgO
- 0-5%
- CaO
- 5-10%
- SrO
- 5-12%
- BaO
- 0-3%
- B2O3
- 0-3%
- Li2O
- 0-2%
- with the relationships
- Na2O+K2O>10%
- MgO+CaO+SrO+BaO>12% and said composition having a thermal expansion coefficient between 80 and 90×10−7/° C., wherein the glass has a viscosity corresponding to log η=3.5 at a temperature at least equal to 1160° C.
A glass substrate for an emissive display, wherein a glass comprises a composition comprising the constituents below, in the following proportions by weight:
- SiO2
- 67.5-75%
- Al2O3
- 0.5-1%
- ZrO2
- 2-7%
- Na2O
- 2-9%
- K2O
- 4-11%
- MgO
- 0-5%
- CaO
- 5-10%
- SrO
- 5-12%
- BaO
- 0-3%
- B2O3
- 0-3%
- Li2O
- 0-2%
- with the relationships
- Na2O+K2O>10%
- MgO+CaO+SrO+BaO>12%
- and said composition having a thermal expansion coefficient between 80 and 90×10−7/° C., wherein the glass has a viscosity corresponding to log η=2 at a temperature not exceeding 1560° C.
Dependencies are inferred from the claim text.