Patent ID: 9714192
Date: 2017-07-25
CPC Classifications: C03C,Y10T

Claim:
1. An alkali aluminosilicate glass comprising: at least about 50 mol % SiO 2 , from about 9 mol % to about 22 mol % Al 2 O 3 ; from about 3 mol % to about 10 mol % B 2 O 3 ; from greater than 14 mol % to about 20 mol % Na 2 O; from 0 mol % to 1 mol % K 2 O; MgO, and ZnO, wherein MgO+ZnO≧0.1 mol %, 0 mol %≦MgO≦6 mol %, and 0 mol %≦ZnO≦6 mol %, and having a layer under a compressive stress CS(d) that varies as a function of depth d from a surface of the glass to a depth of layer DOL, wherein 1.2·CS erfc (d)≧CS(d)≧1.1·CS erfc (d) at 0.4·DOL≦d≦0.6·DOL, where CS erfc (d) is a compressive stress at depth d determined from an error function erfc.