Patent ID: 11964908
Assignee: NIPPON ELECTRIC GLASS CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  G | IPC B  C

Claim 16:
17. A method of manufacturing a tempered glass sheet, comprising:
a preparation step of preparing a glass sheet to be tempered including as a glass composition, in terms of mol %, 50% to 80% of SiO2, 16.25% to 25% of Al2O3, 0% to 10% of B2O3, 3% to 15% of Li2O, 3% to 21% of Na2O, 0% to 10% of K2O, 0% to 10% of MgO, 0% to 10% of ZnO, and 2.55% to 15% of P2O5; and
an ion exchange step of subjecting the glass sheet to be tempered to ion exchange treatment a plurality of times, to thereby obtain a tempered glass sheet having a compressive stress layer in a surface thereof,
wherein the glass sheet to be tempered satisfies the following relationship:

([SiO2]+1.2×[P2O5]−3×[Al2O3]−2×[Li2O]−1.5×[Na2O]−[K2O]−[B2O3])≤−9.90 mol %,

wherein the glass sheet to be tempered satisfies the following relationship:

a molar ratio ([B2O3]+[Na2O]−[P2O5])/([Al2O3]+[Li2O])≥0.30,

wherein the glass sheet to be tempered satisfies the following relationship:

a molar ratio ([Na2O]−[Li2O])/([Al2O3]+[B2O3]+[P2O5])≤0.151, and

wherein the glass sheet to be tempered comprises, in terms of mol %, 10% to 16.99% of ([Li2O]+[Na2O]+[K2O]).