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US 12,434,995 B2Granted
Ultrathin glass with high impact resistance
AssigneeSCHOTT Glass Technologies (Suzhou) Co. Ltd.
InventorsNing Da, Feng He, Wei Xiao, Jiaqi Meng, Ulrich Peuchert, Michael Drisch, Markus Heiss-Chouquet, Inge Burger, Julia Weisshuhn
Life of this patent
Estimating the term…
Abstract
An ultrathin chemically toughened and subsequently etched glass article is provided. The article has a thickness of less than or equal to 0.4 mm and a breakage height (given in mm) of more than 200 multiplied by the thickness (t given in mm)). Further, the article has a breakage bending radius (given in mm) of less than 100000 multiplied by the thickness (t given in mm) and divided by a surface compressive stress (in MPa) measured at a first surface.
Claims24
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.
8 more elements
A chemically toughened and subsequently etched glass article, comprising:
- glass having a first surface and a second 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, 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. %):
- SiO2
- 40-75
- Al2O3
- 10-30
- K2O
- greater than 0 to 10%
- Li2O + Na2O + K2O
- greater than 14 to 30
- MgO + CaO + SrO + BaO + ZnO
- 0-15
- TiO2 + ZrO2
- 0-15
- P2O5
- 0-10, and
- wherein the glass is free from B2O3.
20 more elements
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
- Na2O greater than or equal to 14 to 30.
8 more elements
Dependencies are inferred from the claim text.