Alkali-free glass and preparation thereof
AssigneeLG Chem, Ltd.
InventorsDong-Kwon Lee, Jung-Sik Bang, Sang-Kook Kim, Won-Bae Lim, Su-Hwan Kim, Da-Jeong Kim
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Abstract
The present invention provides the composition of an alkali-free glass composition containing no alkali metal oxide and the preparation thereof. The alkali-free glass comprising substantially no alkali metal oxide according to the present invention comprises 46 to 57 wt % of SiO2; 3.5 to 7.5 wt % of B2O3; 21 to 29 wt % of Al2O3; 3 to 14 wt % of MgO; 11 to 16 wt % of CaO; and 1 to 5 wt % of SrO, based on the total weight of oxides present therein.
Claims12
An alkali-free glass comprising oxides, the oxides consisting of, based on the total weight of oxides present therein,
- 46 to 57 wt % of SiO2;
- 4 to 6 wt % of B2O3;
- 25 to 29 wt % of Al2O3;
- 3 to 14 wt % of MgO;
- 11 to 16 wt % of CaO;
- and
- 1 to 5 wt % of SrO,
- wherein the alkali-free glass has a temperature less than 1510° C. at a viscosity of 102 dPas, and a temperature less than 1210° C. at a viscosity of 104 dPas.
A method for preparing an alkali-free glass, comprising combining raw materials of glass to obtain an alkali-free glass comprising oxides, the oxides consisting of, based on the total weight of oxides present therein,
- 46 to 57 wt % of SiO2;
- 4 to 6 wt % of B2O3;
- 25 to 29 wt % of Al2O3;
- 3 to 14 wt % of MgO;
- 11 to 16 wt % of CaO;
- and
- 1 to 5 wt % of SrO,
- wherein the prepared alkali-free glass has a temperature less than 1510° C. at a viscosity of 102 dPas, and a temperature less than 1210° C. at a viscosity of 104 dPas.
Dependencies are inferred from the claim text.