Glass plate for display panels, process for producing it, and process for producing TFT panel
AssigneeAsahi Glass Company, Limited
InventorsManabu Nishizawa, Yuya Shimada, Yuichi Kuroki, Kei Maeda
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Abstract
To provide a glass plate for display panels which has a low 82O3 content and a low compaction and which can be used as a glass substrate for large TFT panels. A glass plate for display panels, which comprises, as a glass matrix composition as represented by mass % based on oxide: SiO2 50.0 to 73.0, Al2O3 6.0 to 20.0, B2O3 0 to 2.0, MgO 4.2 to 9.0, CaO 0 to 6.0, SrO 0 to 2.0, BaO 0 to 2.0, MgO+CaO+SrO+BaO 6.5 to 11.3, Li2O 0 to 2.0, Na2O 2.0 to 18.0, K2O 0 to 13.0, and Li2O+Na2O+K2O 8.0 to 18.0, and has a heat shrinkage (C) of at most 20 ppm.
Claims10
A glass plate comprising:
- as a glass matrix composition comprising, as represented by mass % based on oxide:
- SiO2 65.0 to 73.0,
- Al2O3 6.0 to 15.0,
- B2O3 0 to 1.0,
- MgO 5.0 to 9.0,
- CaO 0 to less than 2.0,
- SrO 0 to 1.0,
- BaO 0 to 1.0,
- MgO+CaO+SrO+BaO 6.5 to 10.0,
- Li2O 0 to 1.0,
- Na2O 3.0 to 17.0,
- K2O 0 to 12.0, and
- Li2O+Na2O+K2O 10.0 to 18.0,
- wherein the glass plate has a heat shrinkage (C) of at most 15 ppm and a density of at most 2.46 g/cm3.
A glass plate comprising:
- a glass matrix composition comprising, as represented by mass % based on oxide:
- SiO2 50.0 to 65.0,
- Al2O3 16.0 to 20.0,
- B2O3 0 to 1.0,
- MgO 4.2 to 8.0,
- CaO 2 to 6.0,
- SrO 0 to 1.0,
- BaO 0 to 1.0,
- MgO+CaO+SrO+BaO 6.5 to 11.0,
- Li2O 0 to 1.0,
- Na2O 2.0 to 12.0,
- K2O 0 to 12.0,
- Li2O+Na2O+K2O 8.0 to 17.0,
- wherein the glass plate has a heat shrinkage (C) of at most 20 ppm and an average coefficient of thermal expansion from 50 to 350° C. of at most 83×10−7/° C.
Dependencies are inferred from the claim text.