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AssigneeAsahi Glass Company, Limited
InventorsHirofumi TOKUNAGA, Akio Koike, Manabu Nishizawa, Tomoyuki Tsujimura
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The present invention relates to an alkali-free glass having a strain point of 710° C. or higher, an average thermal expansion coefficient at from 50 to 350° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1,710° C. or lower, and a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1,320° C. or lower, containing, indicated by % by mass on the basis of oxides: SiO2 58.5 to 67.5, Al2O3 18 to 24, B2O3 0 to 1.7, MgO 6.0 to 8.5, CaO 3.0 to 8.5, SrO 0.5 to 7.5, BaO 0 to 2.5, and ZrO2 0 to 4.0, containing 0 to 0.35% by mass of Cl, 0.01 to 0.15% by mass of F, and 0.01 to 0.3% by mass of SnO2, and having a β-OH value of the glass of from 0.15 to 0.60 mm−1.
An alkali-free glass having a strain point of 710° C. or higher, an average thermal expansion coefficient at from 50 to 350° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1,710° C. or lower, and a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1,320° C. or lower, comprising, indicated by % by mass on the basis of oxides:
An alkali-free glass having a strain point of 710° C. or higher, an average thermal expansion coefficient at from 50 to 350° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1,710° C. or lower, and a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1,320° C. or lower, comprising, indicated by % by mass on the basis of oxides:
Dependencies are inferred from the claim text.