US 12,281,039 B2
Chemically strengthened glass
Kenji Imakita, Tokyo (JP); Suguru Murayama, Tokyo (JP); Izuru Kashima, Tokyo (JP); and Kazuki Kanehara, Tokyo (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on May 12, 2023, as Appl. No. 18/316,524.
Application 18/316,524 is a continuation of application No. 17/692,335, filed on Mar. 11, 2022, granted, now 11,718,557.
Application 17/692,335 is a continuation of application No. 16/585,200, filed on Sep. 27, 2019, granted, now 11,312,656, issued on Apr. 26, 2022.
Application 16/585,200 is a continuation of application No. PCT/JP2018/014277, filed on Apr. 3, 2018.
Claims priority of application No. 2017-076106 (JP), filed on Apr. 6, 2017; and application No. 2018-018508 (JP), filed on Feb. 5, 2018.
Prior Publication US 2023/0278916 A1, Sep. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C03C 21/00 (2006.01); C03C 3/083 (2006.01); C03C 3/085 (2006.01); C03C 3/091 (2006.01); C03C 3/093 (2006.01); C03C 3/097 (2006.01)
CPC C03C 21/002 (2013.01) [C03C 3/083 (2013.01); C03C 3/085 (2013.01); C03C 3/091 (2013.01); C03C 3/093 (2013.01); C03C 3/097 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A chemically strengthened glass, comprising:
50 to 67% of SiO2, 7 to 30% of Al2O3, 2 to 10% of B2O3, 0 to 3% of P2O5, 2 to 8% of MgO, 0 to 3% of CaO, 0 to 2% of SrO, 0 to 2% of BaO, 0 to 2% of ZnO, 0 to 2% of TiO2, 0 to 2% of ZrO2, 7.5 to 15% of Li2O, 1 to 6% of Na2O, and 0 to 3% of K2O in mole percentage on an oxide basis,
wherein the chemically strengthened glass satisfies A1 [MPa] of 600 or more, A2 [MPa] of 150 or more, B1 [μm] of 6.0 or less, B2 [μm] of 10% or more of t [μm], B2 [μm] of 125 μm or more, C [MPa] of −50 or less, A1/B1 [MPa/μm] of 100 or more, when the chemically strengthened glass has a thickness t [μm] and a profile of a stress value [MPa] at a depth x [μm] from a glass surface is approximated by an error least-squares method in a region of 0<x<3t/8 using function (I) while defining a compressive stress as positive and a tensile stress as negative, A1erfc(x/B1)+A2erfc(x/B2)+C, erfc is a complementary error function, and relations of A1>A2 and B1<B2 are satisfied, and the thickness t is 0.3 mm or more and 2 mm or less.