C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
261/19
C03C 3/091 (2006.01) C03C 3/093 (2006.01) G02F 1/1333 (2006.01)
Patent
CA 1320509
ABSTRACT OF THE DISCLOSURE Glass compositions suitable for the manufacture of sheet glass for liquid crystal display (LCD) devices are disclosed, such glasses consisting essentially, in cation percent, of about 52-58% SiO2, 12.5-18% Al2O3, 20-23% B2O3, 0-4% MgO, 0-6% CaO, 0-6% SrO, 1-9% BaO, 8-12% MgO+CaO+SrO+ BaO, 0-3% ZnO, and 0-1% of fining agents. These glasses have a strain point in excess of 625°C, an average linear coefficient of thermal expansion in the range of about 20-60x10-7/°C over the range 25-300°C, an internal liquidus temperature not exceeding about 1050°C, and chemical durability sufficient to exhibit a weight loss in 5% HCl at 95°C not exceeding about 10 mg/cm2 in a 24 hour period, and so offer the glass stability necessary for overflow downdraw sheet forming and the high strain point and chemical durability needed for LCD manufacture.
579238
Corning Incorporated
Gowling Lafleur Henderson Llp
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