Patent ID: 9162919
Filing Date: 2015-10-20
Classification: C03B,C03C

Abstract:
1. A glass substantially free of alkali metals comprising, in mole percent on an oxide basis: SiO 2 70.31-72.5, Al 2 O 3 11-13.5, B 2 O 3 1-5, MgO 3-5, CaO 4-6.5, SrO 0-3, BaO 1.5-5, where SiO 2 , Al 2 O 3 , B 2 O 3 , MgO, CaO, SrO and BaO represent the mole percents of the oxide components; wherein: (i) the glass has an annealing point greater than 785° C., (ii) the glass satisfies the following relationship: where T liq is the liquidus temperature of the glass and T 35k is the temperature at which the glass has a viscosity of 35,000 poise, (iii) the Sb (iv) the glass is made from batch materials that do not include Y