# US 2018/0022638 A1 · Ion exchangeable li-containing glass compositions for 3-d forming

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- Number: US 2018/0022638 A1
- Document ID: US20180022638A1
- Status: Published application
- Kind: A1
- Application number: 15/718,391
- Filed: 2017-09-28
- Published: 2018-01-25
- Earliest claimed: 2012-07-17
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Marie Jacqueline Monique Comte; Melinda Ann Drake; Karen Leslie Geisinger; Sinue Gomez; Robert Michael Morena; Charlene Marie Smith; Randall Eugene Youngman
- Web page: https://patentgrep.com/patent/US20180022638A1

## CPC

- C03C 3/097: containing phosphorus, niobium or tantalum
- 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 4/18: for ion-sensitive glass
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- Y10T 428/315: Surface modified glass [e.g., tempered, strengthened, etc.]
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

According to one embodiment, a glass article may include SiO2, Al2O3, Li2O and Na2O. The glass article may have a softening point less than or equal to about 810° C. The glass article may also have a high temperature CTE less than or equal to about 27×10−6/° C. The glass article may also be ion exchangeable such that the glass has a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 μm after ion exchange in a salt bath comprising KNO3 at a temperature in a range from about 390° C. to about 450° C. for less than or equal to approximately 15 hours.

## Claims

### Claim at position 1

1-27. (canceled)

### Claim 28

A glass article comprising:
greater than or equal to 67 mol. % to about 71 mol. % SiO2;
from about 7 mol. % to about 12 mol. % Al2O3;
from about 1 mol. % to about 9 mol. % Li2O;
less than about 16 mol. % Na2O;
greater than 0 mol. % to about 5 mol. % K2O; and
from about 0.8 mol. % to about 10 mol. % of a divalent oxide, wherein the divalent oxide comprises greater than 0 mol. % to about 1 mol. % CaO and at least one of MgO and ZnO.

### Claim 29 (depends on 28)

The glass article of claim 28 further comprising from about 0.5 mol. % to about 2 mol % ZrO2.

### Claim 30 (depends on 28)

The glass article of claim 28, wherein a concentration of K2O is less than or equal to about 3.0 mol. %.

### Claim 31 (depends on 28)

The glass article of claim 28, wherein a concentration of CaO is less than or equal to about 0.5 mol. %.

### Claim 32 (depends on 28)

The glass article of claim 28, wherein the concentration of B2O3 is less than or equal to 1.0 mol. %.

### Claim 33 (depends on 28)

The glass article of claim 28, wherein the glass article is substantially free of B2O3.

### Claim 34 (depends on 28)

The glass article of claim 28, wherein a sum of a concentration of Al2O3 (mol. %), and a concentration of the divalent oxide (mol. %) is greater than about 10 mol %.

### Claim 35 (depends on 28)

The glass article of claim 28, wherein a concentration of SiO2 is greater than or equal to 68 mol. %.

### Claim 36 (depends on 28)

The glass article of claim 28, wherein the glass article is ion exchange strengthened.

### Claim 37 (depends on 36)

The glass article of claim 36, wherein the glass article has a compressive stress greater than or equal to about 650 MPa and a depth of layer greater than or equal to about 25 μm.

### Claim 38

A glass article comprising:
greater than or equal to 67 mol. % to about 71 mol. % SiO2;
from about 7 mol. % to about 12 mol. % Al2O3;
from about 1 mol. % to about 9 mol. % Li2O;
less than about 16 mol. % Na2O;
greater than 0 mol. % to about 5 mol. % K2O;
less than 1.0 mol. % B2O3.
from about 0.8 mol. % to about 10 mol. % of a divalent oxide, wherein the divalent oxide comprises greater than 0 mol. % to about 1 mol. % CaO and at least one of MgO and ZnO; and
from about 0.5 mol. % to about 2 mol % ZrO2.

### Claim 39 (depends on 38)

The glass article of claim 38, wherein a concentration of K2O is less than or equal to about 3.0 mol. %.

### Claim 40 (depends on 38)

The glass article of claim 38, wherein a concentration of CaO is less than or equal to about 0.5 mol. %.

### Claim 41 (depends on 38)

The glass article of claim 38, wherein a sum of a concentration of Al2O3 (mol. %), and a concentration of the divalent oxide (mol. %) is greater than about 10 mol %.

### Claim 42 (depends on 38)

The glass article of claim 38, wherein a concentration of SiO2is greater than or equal to 68 mol. %.

### Claim 43 (depends on 38)

The glass article of claim 38, wherein the glass article is ion exchange strengthened.

### Claim 44 (depends on 43)

The glass article of claim 43, wherein the glass article has a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 μm.

### Claim 45 (depends on 44)

The glass article of claim 44, wherein the depth of layer is greater than or equal to about 35 μm.

### Claim 46 (depends on 44)

The glass article of claim 44, wherein the depth of layer is greater than or equal to about 650 MPa.