GLASS COMPOSITION HAVING HIGH THERMAL AND CHEMICAL STABILITY

摘要

Described herein are alkali-free, boroalumino silicate glasses exhibiting desirable physical and chemical properties for use as substrates in flat panel display devices, such as, active matrix liquid crystal displays (AMLCDs) and active matrix organic light emitting diode displays (AMOLEDs). In accordance with certain of its aspects, the glasses possess good dimensional stability as a function of temperature.

主权项

1. A glass comprising in mol percent on an oxide basis:
70≦SiO2≦74.5 10.5≦Al2O3≦13.5 0≦B2O3≦2.5 3≦MgO≦7 3≦CaO≦7 0≦SrO≦4 1.5≦BaO≦6 0≦SnO2≦0.3 0≦CeO2≦0.3 0≦As2O3≦0.5 0.01≦Fe2O3≦0.08 F+Cl+Br≦0.4wherein
(a) 1.05≦RO/Al2O3≦1.7; (b) 0.2≦MgO/RO≦0.45; (c) the glass comprises less than 0.05% by weight of Sb2O3; and (d) the glass has an anneal point greater than 785° C.;where:
(i) RO=MgO+CaO+SrO+BaO, and (ii) SiO2, Al2O3, B2O3, MgO, CaO, SrO and BaO represent the mol percents of the representative oxide components.