Thin substrates having mechanically durable edges

Patent metadata

Field	Value
Publication number	US-9422188-B2
Application number	US-201013266548-A
Country	US
Kind code	B2
Filing date	May 21, 2010
Priority date	May 21, 2009
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A substrate ( 100 ) comprising a sheet of either a glass, a glass ceramic, or a ceramic and having increased edge strength. A polymeric edge coating ( 120 ) prevents creation of strength limiting defects along the edges of the substrate and protects the bend strength of the edges. The substrate may also have at least two parallel high strength edges ( 110, 112 ) and an edge coating ( 120 ) of a polymeric material covering at least a portion of each of the high strength edges to preserve the high strength edges from the introduction of defects and damage to the edges. Each of the two parallel high strength edges has a bend strength that is capable of less than about 2% failure probability at a stress level of 200 MPa over a test length of 50 mm. A method of making the substrate is also provided.

First claim

What is claimed is:

1. A substrate comprising:
a. a sheet comprising at least one material selected from the group consisting of a glass, a ceramic, and a glass ceramic, the sheet having a first surface, a second surface, and at least two parallel edges joining the first surface and the second surface, each of the at least two parallel edges having a bend strength capable of less than 2% failure probability at a stress level of 200 Map over a test length of 50 mm; and
b. a polymeric edge coating covering at least a portion of each of the at least two parallel edges, wherein the polymeric edge coating has a thickness in a range from about 5 μm to about 50 μm and protects each of the edges from the introduction of defects and damage, and wherein the first surface of the sheet and-the second surface of the sheet are each entirely free from a coating.

2. The substrate according to claim 1 , wherein the substrate has a thickness of up to about 0.6 mm.

3. The substrate according to claim 2 , wherein the substrate has a thickness of up to about 0.1 mm.

4. The substrate according to claim 1 , wherein the polymeric edge coating has a modulus of up to about 10 GPa.

5. The substrate according to claim 1 , wherein the polymeric edge coating comprises at least one material selected from the group consisting of a silicone, an epoxy, an acrylate, a urethane, and combinations thereof.

6. The substrate according to claim 1 , where each of the at least two parallel edges is slot-drawn, fusion-drawn, re-drawn, or laser cut.

7. The substrate according to claim 1 , wherein the substrate has at least one strengthened surface layer extending from at least one of the first surface and the second surface to a depth of layer, wherein the strengthened surface layer is under a compressive stress.

8. The substrate according to claim 7 , wherein the strengthened surface layer is an ion-exchanged layer.

9. The substrate according to claim 1 , wherein the substrate is a protective cover glass for use in at least one device selected from the group consisting of a hand held electronic device, an information-related terminal, and a touch sensor device.

10. The substrate according to claim 1 , wherein each of the at least two parallel edges is unfinished.

11. A substrate comprising:
a. a sheet comprising at least one material selected from the group consisting of a glass, a ceramic, and a glass ceramic, the sheet having a first surface, a second surface, and at least two parallel full-body laser-cut edges joining the first surface and the second surface, each of the at least two parallel full-body laser-cut edges having edge faces that are substantially free of visible defects to provide a bend strength capable of less than 2% failure probability at a stress level of 200 MPa over a test length of 50 mm; and
b. a polymeric edge coating covering at least a portion of each of the at least two parallel edges, wherein the polymeric edge coating has a thickness in a range from about 5 μm to about 50 μm and protects each of the edges from the introduction of defects and damage, and wherein the first surface of the sheet and the second surface of the sheet are each entirely free from a coating.

12. The substrate according to claim 11 , wherein the substrate has a thickness of up to about 0.6 mm.

13. The substrate according to claim 12 , wherein the substrate has a thickness of up to about 0.1 mm.

14. The substrate according to claim 11 , wherein the polymeric edge coating has a modulus of up to about 10 GPa.

15. The substrate according to claim 11 , wherein the polymeric edge coating comprises at least one material selected from the group consisting of a silicone, an epoxy, an acrylate, a urethane, and combinations thereof.

16. The substrate according to claim 11 , wherein the substrate has at least one strengthened surface layer extending from at least one of the first surface and the second surface to a depth of layer, wherein the strengthened surface layer is under a compressive stress.

17. The substrate according to claim 16 , wherein the strengthened surface layer is an ion-exchanged layer.

18. The substrate according to claim 11 , wherein the substrate is a protective cover glass for use in at least one of device selected from the group consisting of a hand held electronic device, an information-related terminal, and a touch sensor device.

19. The substrate according to claim 11 , wherein each of the at least two parallel edges is unfinished.

Assignees

• Garner Sean Matthew
• Glaesemann Gregory Scott
• Li Xinghua
• Corning Inc

Inventors

• Garner Sean Matthew
• Glaesemann Gregory Scott
• Li Xinghua

Classifications

• C03C17/002 Primary

  for flat glass, e.g. float glass · CPC title

• C04B41/4572

  Partial coating or impregnation of the surface of the substrate · CPC title

• Y10T428/24777

  Edge feature · CPC title

• C03C2218/365

  Coating different sides of a glass substrate · CPC title

• C03C2217/78

  Coatings specially designed to be durable, e.g. scratch-resistant · CPC title