# US 10,766,809 B2 · Ion exchange processes and chemically strengthened glass substrates resulting therefrom

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- Number: US 10,766,809 B2
- Document ID: US10766809B2
- Status: Granted
- Kind: B2
- Application number: 15/497,668
- Filed: 2017-04-26
- Published: 2017-08-10
- Granted: 2020-09-08
- Earliest claimed: 2013-10-14
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Sean Matthew Garner; Michael Lesley Sorensen
- Web page: https://patentgrep.com/patent/US10766809B2

## CPC

- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- B32B 17/061: {of metal}
- B32B 17/10: of synthetic resin
- B32B 17/10137: {Chemical strengthening}
- C03C 3/076: with 40% to 90% silica, by weight {(C03C3/045 takes precedence)}
- C03C 3/078: containing an oxide of a divalent metal, e.g. an oxide of zinc
- C03C 3/083: containing aluminium oxide or an iron compound
- C03C 3/085: containing an oxide of a divalent metal
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/089: containing boron
- C03C 3/091: containing aluminium
- C03C 3/093: containing zinc or zirconium
- C03C 3/095: containing rare earths
- C03C 4/18: for ion-sensitive glass
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A method of performing ion exchange of a thin, flexible glass substrate having an average thickness equal to or less than about 0.3 mm to chemically strengthen the glass substrate is disclosed. The chemically strengthened glass substrate comprises a first compressive stress layer having a first depth of layer, and a second compressive stress layer having a second depth of layer, the first and second stress layers being separated by a layer of tensile stress. A laminated article comprising the chemically strengthened glass substrate is also described.

## Claims

### Claim 1

A glass article comprising:
a glass substrate including a first ion-exchanged surface and a second ion-exchanged surface opposite the first ion-exchanged surface, the first and second ion-exchanged surfaces defining an average thickness therebetween;
a first compressive stress layer extending inward from the first ion-exchanged surface toward a center of the glass substrate comprising a first depth of layer DOL1, wherein DOL1 is greater than 25% of the average thickness of the glass substrate;
a second compressive stress layer extending inward from the second ion-exchanged surface toward the center of the glass substrate comprising a second depth of layer DOL2 less than DOL1; and
a second substrate is bonded to the first ion-exchanged surface.

### Claim 2 (depends on 1)

The glass article according to claim 1, wherein the compressive stress at the first ion-exchanged surface of the glass substrate is at least 500 MPa.

### Claim 3 (depends on 1)

The glass article according to claim 1, wherein the compressive stress at the first ion-exchanged surface of the glass substrate is at least 950 MPa.

### Claim 4 (depends on 1)

The glass article according to claim 1, wherein the compressive stress at the second ion-exchanged surface of the glass substrate is at least 850 MPa.

### Claim 5 (depends on 1)

The glass article according to claim 1, wherein DOL1 is equal to or greater than 10 μm.

### Claim 6 (depends on 1)

The glass article according to claim 1, wherein DOL2 is equal to or greater than 25% of the average thickness of the glass substrate.

### Claim 7 (depends on 1)

The glass article of claim 1, wherein the second substrate comprises metal.

### Claim 8 (depends on 1)

The glass article of claim 1, wherein the second substrate comprises a polymer.

### Claim 9 (depends on 1)

The glass article of claim 1, wherein an adhesive layer bonds the second substrate to the first ion-exchanged surface.

### Claim 10 (depends on 1)

The glass article of claim 1, wherein the glass substrate is planar.

### Claim 11 (depends on 1)

The glass article of claim 1, wherein the glass substrate is curved.

### Claim 12 (depends on 11)

The glass article of claim 11, wherein the glass substrate comprises a complex curvature shape.

### Claim 13 (depends on 1)

The glass article of claim 1, wherein the second substrate comprises a layer.

### Claim 14 (depends on 13)

The glass article of claim 13, wherein the layer of the second substrate comprises a polymer film.

### Claim 15 (depends on 13)

The glass article of claim 13, wherein the layer of the second substrate comprises a polymer coating.

### Claim 16 (depends on 13)

The glass article of claim 13, wherein the layer of the second substrate comprises a metal foil.

### Claim 17 (depends on 13)

The glass article of claim 13, wherein the average thickness of the glass substrate is not less than a thickness of the layer of the second substrate.