US 12,275,671 B2
Glass compositions with improved chemical and mechanical durability
Paul Stephen Danielson, Dundee, NY (US); Steven Edward DeMartino, Painted Post, NY (US); Melinda Ann Drake, Corning, NY (US); Robert Michael Morena, Lindley, NY (US); Santona Pal, Painted Post, NY (US); and Robert Anthony Schaut, Painted Post, NY (US)
Assigned to Corning Incorporated, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Mar. 21, 2022, as Appl. No. 17/699,447.
Application 17/699,447 is a continuation of application No. 16/230,445, filed on Dec. 21, 2018, granted, now 11,325,855.
Application 16/230,445 is a continuation of application No. 15/449,761, filed on Mar. 3, 2017, granted, now 10,196,298.
Application 15/449,761 is a continuation of application No. 14/551,773, filed on Nov. 24, 2014, granted, now 9,624,125, issued on Apr. 18, 2017.
Application 14/551,773 is a continuation of application No. 13/660,450, filed on Oct. 25, 2012, granted, now 8,980,777, issued on Mar. 17, 2015.
Claims priority of provisional application 61/551,163, filed on Oct. 25, 2011.
Prior Publication US 2022/0204384 A1, Jun. 30, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C03C 3/087 (2006.01); A61J 1/00 (2023.01); C03C 3/091 (2006.01); C03C 4/18 (2006.01); C03C 4/20 (2006.01); C03C 21/00 (2006.01)
CPC C03C 3/087 (2013.01) [A61J 1/00 (2013.01); C03C 3/091 (2013.01); C03C 4/18 (2013.01); C03C 4/20 (2013.01); C03C 21/002 (2013.01); C03C 2204/00 (2013.01); Y10T 428/131 (2015.01); Y10T 428/1317 (2015.01); Y10T 428/26 (2015.01); Y10T 428/315 (2015.01)] 17 Claims
 
1. A glass comprising:
74 mol. % to 78 mol. % SiO2;
X mol. % Al2O3, wherein X is greater than or equal to 5 and less than 7;
alkaline earth metal oxide comprising MgO and CaO, wherein:
CaO is present in an amount greater than or equal to 0.1 mol. % and less than or equal to 1.0 mol. %;
MgO is present in an amount greater than or equal to 4 mol. % and less than or equal to 7 mol. %; and
a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %)) is less than or equal to 0.2;
Y mol. % alkali metal oxide, wherein the alkali metal oxide comprises Na2O in an amount greater than 9 mol. % and less than or equal to 13 mol. %; and
less than or equal to 0.4 mol. % of a fining agent, wherein the glass composition is free of boron and compounds of boron.