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US 12,421,159 B2Granted
High strain point and high young's modulus glasses
AssigneeCorning Incorporated
InventorsVenkatesh Botu, Xiaoju Guo, Ellen Anne King, Lisa Ann Lamberson, Adama Tandia, Kochuparambil Deenamma Vargheese, Jingshi Wu
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Abstract
Substantially alkali free glasses are disclosed with can be used to produce substrates for flat panel display devices, e.g., active-matrix liquid crystal displays (AMLCDs). The glasses have high annealing temperatures and Young's modulus. Methods for producing substantially alkali free glasses using a downdraw process (e.g., a fusion process) are also disclosed.
Claims20
A glass comprising in mole percent on an oxide basis:
- SiO2 68.84-74.07,
- Al2O3 10.41-14.87,
- B2O3 0-0.8,
- MgO 3.44-7.45,
- CaO 4.19-8.23,
- SrO 0-3.36,
- BaO 0.91-5.59, and
- SnO2 0.09-0.2%,
- wherein the glass is alkali-free defined by a sum of the Na20, K20, and Li2O concentrations being equal to or less than 0.1 mol. %,
- wherein the glass has a strain point greater than 752° C. and a Young's modulus greater than 83.56 GPa, and wherein Fe2O3 is less than 0.005 mole percent in the glass,
- wherein the glass is free of Y2O3 and La2O3.
8 more elements
Dependencies are inferred from the claim text.