US 12,391,599 B2
Glass composition for chemical strengthening and chemically strengthened glass article
Akira Kitayama, Osaka (JP); and Junji Kurachi, Hyogo (JP)
Assigned to NIPPON SHEET GLASS COMPANY, LIMITED, Tokyo (JP)
Appl. No. 18/001,665
Filed by Nippon Sheet Glass Company, Limited, Tokyo (JP)
PCT Filed Jun. 30, 2021, PCT No. PCT/JP2021/024819
§ 371(c)(1), (2) Date Dec. 13, 2022,
PCT Pub. No. WO2022/004809, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2020-112982 (JP), filed on Jun. 30, 2020.
Prior Publication US 2023/0373844 A1, Nov. 23, 2023
Int. Cl. B32B 15/04 (2006.01); B32B 17/06 (2006.01); C03C 3/087 (2006.01); C03C 21/00 (2006.01)
CPC C03C 3/087 (2013.01) [C03C 21/002 (2013.01)] 16 Claims
 
1. A glass composition for chemical strengthening, comprising, as components, in mol %:
66 to 71% SiO2;
1 to 5% Al2O3;
4 to 8% MgO;
4 to 6.00% CaO;
14 to 16% Na2O; and
0.7 to 1.3% K2O, wherein, in mol %,
MgO+CaO+SrO+BaO+ZnO is 10% or more and 14% or less,
a molar ratio MgO/(MgO+CaO) is 0.54 to 0.7, and
a molar ratio Na2O/(Na2O+K2O) is 0.9 to 0.97.