US 11,731,901 B2
Chemically strengthened glass and production method therefor
Qing Li, Tokyo (JP); Kenji Imakita, Tokyo (JP); Akio Koike, Tokyo (JP); and Eriko Maeda, Tokyo (JP)
Assigned to AGC Inc., Chiyoda-ku (JP)
Filed by AGC Inc., Chiyoda-ku (JP)
Filed on Jan. 21, 2020, as Appl. No. 16/747,593.
Application 16/747,593 is a continuation of application No. PCT/JP2018/027579, filed on Jul. 23, 2018.
Claims priority of application No. 2017-144868 (JP), filed on Jul. 26, 2017; and application No. 2018-002200 (JP), filed on Jan. 10, 2018.
Prior Publication US 2020/0207660 A1, Jul. 2, 2020
Int. Cl. C03C 21/00 (2006.01); C03B 32/02 (2006.01); C03C 10/00 (2006.01); C03C 4/00 (2006.01); C03C 4/18 (2006.01); B32B 17/10 (2006.01)
CPC C03C 21/002 (2013.01) [B32B 17/10 (2013.01); C03B 32/02 (2013.01); C03C 4/0028 (2013.01); C03C 4/18 (2013.01); C03C 10/0027 (2013.01); C03C 10/0054 (2013.01); C03C 2204/00 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A chemically strengthened glass, comprising by mass % on an oxide basis:
58 to 70% of SiO2;
15 to 30% of Al2O3;
2 to 10% of Li2O;
0 to 5% of Na2O;
0 to 2% of K2O;
1 to 6% of SnO2;
0.5 to 6% of ZrO2; and
0 to 6% of P2O5,
wherein
a total content of Na2O and K2O is from 2% to 5%:
a total content of SnO2 and ZrO2 is 7% or higher and 12% or lower; and
a content ratio of SnO2/(SnO2+ZrO2) is 0.45 or more and 0.7 or less,
wherein
the chemically strengthened glass does not comprise As2O3,
the chemically strengthened glass has a compressive stress layer in a surface thereof,
wherein:
the chemically strengthened glass is a crystallized glass having precipitated crystals of β-spodumene as a main crystal; and
the surface of the chemically strengthened glass has an X-ray diffraction pattern different from an X-ray diffraction pattern of a crystal of an inside of the chemically strengthened glass.