Bendable glass stack assemblies, articles and methods of making the same

Patent metadata

Field	Value
Publication number	US-11745471-B2
Application number	US-202217838757-A
Country	US
Kind code	B2
Filing date	Jun 13, 2022
Priority date	Jan 29, 2014
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A glass element having a thickness from 25 μm to 125 μm, a first primary surface, a second primary surface, and a compressive stress region extending from the first primary surface to a first depth, the region defined by a compressive stress GI of at least about 100 MPa at the first primary surface. Further, the glass element has a stress profile such that it does not fail when it is subject to 200,000 cycles of bending to a target bend radius of from 1 mm to 20 mm, by the parallel plate method. Still further, the glass element has a puncture resistance of greater than about 1.5 kgf when the first primary surface of the glass element is loaded with a tungsten carbide ball having a diameter of 1.5 mm.

First claim

What is claimed is:

1. A stack assembly comprising:
a glass element having a thickness from 25 μm to 125 μm, a first primary surface, and a second primary surface, the glass element further comprising: (a) a first glass layer having a first primary surface; and (b) a compressive stress region extending from the first primary surface of the glass layer to a first depth in the glass layer, the region defined by a compressive stress of at least 100 MPa at the first primary surface of the layer;
a glass structure having a thickness greater than the thickness of the glass element and two substantially parallel edge surfaces, wherein the glass element is arranged in a central region of the structure between the substantially parallel edge surfaces.

2. The stack assembly of claim 1 , wherein the glass layer comprises an alkali-free or alkali-containing aluminosilicate, borosilicate, boroaluminosilicate, or silicate glass composition.

3. The stack assembly of claim 1 , wherein the compressive stress at the first primary surface of the glass layer is from 600 MPa to 1000 MPa.

4. The stack assembly of claim 1 , wherein the first depth is set at one third of the thickness of the glass layer or less from the first primary surface of the glass layer.

5. The stack assembly of claim 1 , wherein the first depth is set at 20% of the thickness of the glass layer or less from the first primary surface of the glass layer.

6. The stack assembly of claim 1 , further comprising: a second layer having a low coefficient of friction disposed on the first primary surface of the glass element.

7. The stack assembly of claim 6 , wherein the second layer is a coating comprising a fluorocarbon material selected from the group consisting of thermoplastics and amorphous fluorocarbons.

8. The stack assembly of claim 6 , wherein the second layer is a coating comprising one or more of the group consisting of a silicone, a wax, a polyethylene, a hot-end, a parylene, and a diamond-like coating preparation.

9. The stack assembly of claim 6 , wherein the second layer is a coating comprising a material selected from the group consisting of zinc oxide, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, and aluminum magnesium boride.

10. The stack assembly of claim 6 , wherein the second layer is a coating comprising an additive selected from the group consisting of zinc oxide, molybdenum disulfide, tungsten disulfide, hexagonal boron nitride, and aluminum magnesium boride.

11. The stack assembly of claim 6 , wherein the glass element and the second layer having a low coefficient of friction are disposed in a display device.

12. The stack assembly of claim 1 , wherein the compressive stress region comprises a maximum flaw size of 5 μm or less at the first primary surface of the glass layer.

13. The stack assembly of claim 1 , wherein the compressive stress region comprises a plurality of ion-exchangeable metal ions and a plurality of ion-exchanged metal ions, the ion-exchanged metal ions having an atomic radius larger than the atomic radius of the ion-exchangeable metal ions.

14. The stack assembly of claim 1 , wherein the glass layer further comprises an edge, and the glass element further comprises an edge compressive stress region extending from the edge to an edge depth in the glass layer, the edge compressive stress region defined by a compressive stress of at least 100 MPa at the edge.

15. The stack assembly of claim 1 , wherein the glass element further comprises one or more additional glass layers disposed beneath the first glass layer.

16. The stack assembly of claim 1 , wherein the glass element is characterized by: (a) an absence of failure when the element is held at a bend radius from 3 mm to 20 mm for at least 60 minutes at 25° C. and 50% relative humidity; and (b) a puncture resistance of greater than 1.5 kgf when the second primary surface of the element is supported by (i) an 25 μm thick pressure-sensitive adhesive having an elastic modulus of less than 1 GPa and (ii) an 50 μm thick polyethylene terephthalate layer having an elastic modulus of less than 10 GPa, and the first primary surface of the element is loaded with a tungsten carbide ball having a diameter of 1.5 mm.

17. The stack assembly of claim 1 , wherein the glass element is characterized by: (a) an absence of failure when the element is held at a bend radius from 1 mm to 10 mm for at least 60 minutes at 25° C. and 50% relative humidity; and (b) a puncture resistance of greater than 1.5 kgf when the second primary surface of the element is supported by (i) an 25 μm thick pressure-sensitive adhesive having an elastic modulus of less than 1 GPa and (ii) an 50 μm thick polyethylene terephthalate layer having an elastic modulus of less than 10 GPa, and the first primary surface of the element is loaded with a tungsten carbide ball having a diameter of 1.5 mm.

18. The stack assembly of claim 1 , wherein the glass element comprises a pencil hardness of greater than 8H.

19. The stack assembly of claim 1 , wherein when the first primary surface of the glass element is subject to a 1 kgf load from a Vickers indenter, there is introduced a flaw of ≤100 microns in the first primary surface.

20. The stack assembly of claim 1 , wherein when the first primary surface of the glass element is subject to a 2 kgf load from a Vickers indenter, there is introduced a flaw of ≤100 microns in the first primary surface.

21. The stack assembly of claim 1 , wherein the glass element has a Vickers hardness of 550 to 650 kgf/mm2.

22. The stack assembly of claim 1 , wherein the glass element has a retained B10 bend strength of greater than 800 MPa after contact with a cube corner diamond indenter loaded with 10 gf.

23. The stack assembly of claim 1 , comprising F/w≤0.76 N/mm, wherein F is the closing force to put the glass element at the target bend radius, and w is the dimension of the glass element in a direction parallel to the axis around which the glass is bent.

Assignees

• Corning Inc

Inventors

• Chang Theresa
• Chu Polly Wanda
• Cimo Patrick Joseph
• Ellison Adam James
• Gross Timothy Michael
• Hu Guangli
• Smith Nicholas James
• Vaddi Butchi Reddy
• Venkataraman Natesan

Classifications

• G06F1/1652

  the display being flexible, e.g. mimicking a sheet of paper, or rollable · CPC title

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C17/32

  with synthetic or natural resins (C03C17/30 takes precedence) · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title