| 摘要 |
<p>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 DEG C, an average linear coefficient of thermal expansion in the range of about 20-60x10<-><7>/ DEG C over the range 25-300 DEG C, an internal liquidus temperature not exceeding about 1050 DEG C, and chemical durability sufficient to exhibit a weight loss in 5% HCl at 95 DEG C not exceeding about 10 mg/cm<2> 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.</p> |
