US 12,434,995 B2
Ultrathin glass with high impact resistance
Ning Da, Jiangsu (CN); Feng He, Jiangsu (CN); Wei Xiao, Shanghai (CN); Jiaqi Meng, Jiangsu (CN); Ulrich Peuchert, Bodenheim (DE); Michael Drisch, Mainz (DE); Markus Heiss-Chouquet, Bischofsheim (DE); Inge Burger, Oestrich-Winkel (DE); and Julia Weisshuhn, Mainz (DE)
Assigned to SCHOTT GLASS TECHNOLOGIES (SUZHOU) CO. LTD., Jiangsu (CN)
Filed by SCHOTT Glass Technologies (Suzhou) Co. Ltd., Jiangsu (CN)
Filed on Nov. 18, 2020, as Appl. No. 16/951,738.
Application 16/951,738 is a continuation of application No. PCT/CN2019/086869, filed on May 14, 2019.
Application 16/951,738 is a continuation of application No. PCT/CN2018/087560, filed on May 18, 2018.
Prior Publication US 2021/0070650 A1, Mar. 11, 2021
Int. Cl. C03C 3/118 (2006.01); C03C 3/083 (2006.01); C03C 3/085 (2006.01); C03C 3/087 (2006.01); C03C 3/091 (2006.01); C03C 3/093 (2006.01); C03C 3/097 (2006.01); C03C 3/112 (2006.01); C03C 4/18 (2006.01); C03C 15/00 (2006.01); C03C 17/34 (2006.01); C03C 21/00 (2006.01)
CPC C03C 3/118 (2013.01) [C03C 3/083 (2013.01); C03C 3/085 (2013.01); C03C 3/087 (2013.01); C03C 3/091 (2013.01); C03C 3/093 (2013.01); C03C 3/097 (2013.01); C03C 3/112 (2013.01); C03C 4/18 (2013.01); C03C 15/00 (2013.01); C03C 17/3405 (2013.01); C03C 21/002 (2013.01); C03C 2204/00 (2013.01); C03C 2217/78 (2013.01); C03C 2218/11 (2013.01); C03C 2218/365 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A chemically toughened and subsequently etched glass article, comprising:
glass having a first surface and a second surface, wherein the first and/or second surface is an etched surface;
a thickness (t) of less than 0.4 mm between the first and second surfaces;
a compressive stress region extending from the first surface to a first depth of layer (DoL), the compressive stress region having a compressive stress (CS) at the first surface that is at least 100 MPa;
a breakage height (given in mm) of at least the thickness (t in mm) multiplied by a height factor of 200; and
a breakage bending radius (given in mm) of less than the thickness (t in mm) multiplied by a radius factor of 100,000 and divided by the compressive stress (in MPa) at the first surface, and
wherein the breakage height is determined in a pen drop test, wherein, during the pen drop test, the second surface is attached to substrate, wherein the substrate is 100 μm thick and consists of a first layer of polyethylene (PE) material that is 50 μm thick and second layer of a pressure sensitive adhesive (PSA) material that is 50 μm thick layer, wherein the second surface is in contact with the second layer, and wherein, during the pen drop test, the substrate and the glass article are placed on a rigid support with the first surface orientated upwards and impacted until breakage by a 4.5 g pen with a ball-point made from tungsten carbide having a diameter of 300 μm, and
wherein the glass comprises (in wt. %):
K2O greater than 0 to 4; and
Li2O+Na2O+K2O 16 to 30.