High strain point aluminosilicate glasses

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 method for producing glass sheets comprising selecting each of the raw materials to be employed in producing the glass sheets and melting and fining the selected raw materials so that the glass making up the sheets is substantially free of alkali metals and comprises, in mole percent on an oxide basis:
SiO2 69-72.5 Al2O3 11-13.5 B2O3 1-5 MgO 3-5 CaO 4-6.5 SrO 0-3 BaO 1.5-5where SiO2, Al2O3, B2O3, MgO, CaO, SrO and BaO represent the mole percents of the oxide components,
wherein: (i) said selecting each of the raw materials to be employed in producing the glass sheets comprises selecting a raw material that comprises between 0 and 200 ppm sulfur by weight; and (ii) said method comprises deliberately controlling tramp sulfur from raw materials through said selecting of each raw material to comprise between 0 and 200 ppm sulfur by weight.