US 12,234,181 B2
Supporting glass substrate and laminated body
Yusuke Kobayashi, Tokyo (JP); Izuru Kashima, Tokyo (JP); Kazutaka Ono, Tokyo (JP); Seiji Inaba, Tokyo (JP); Hirofumi Yamamoto, Tokyo (JP); and Kiyoshi Tamai, Tokyo (JP)
Assigned to AGC INC., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on Nov. 9, 2020, as Appl. No. 17/093,121.
Claims priority of application No. 2019-208195 (JP), filed on Nov. 18, 2019.
Prior Publication US 2021/0147279 A1, May 20, 2021
Int. Cl. C03C 3/087 (2006.01); B32B 17/10 (2006.01); C03C 4/18 (2006.01); C03C 21/00 (2006.01)
CPC C03C 3/087 (2013.01) [B32B 17/10119 (2013.01); B32B 17/10137 (2013.01); C03C 4/18 (2013.01); C03C 21/002 (2013.01); B32B 2315/08 (2013.01); B32B 2457/14 (2013.01); C03C 2204/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A supporting glass substrate comprising a compression stress layer on a surface thereof, the supporting glass substrate having:
an average thermal expansion coefficient at 50° C. to 200° C. that is 7 ppm/° C. to 15 ppm/° C.,
an internal tensile stress that is 5 MPa to 55 MPa, and
a depth of the compression stress layer that is 10 μm to 60 μm,
wherein the supporting glass substrate comprises the following compounds in mol % in terms of oxides:
SiO2: 62% to 64%,
Al2O3: 4% to 6%,
MgO: 7% to 8.5%,
CaO: 3% to 5%,
Na2O: 8% to 12%,
K2O: 8% to 12%, and
ZrO2: 0.5% to 2%, and
wherein the compression stress layer is formed by chemical strengthening treatment of the supporting glass substrate.