# US 10,370,286 B2 · Glass for chemical tempering, chemically tempered glass, and glass plate for display device

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- Number: US 10,370,286 B2
- Document ID: US10370286B2
- Status: Granted
- Kind: B2
- Application number: 14/597,587
- Filed: 2015-01-15
- Published: 2015-05-07
- Granted: 2019-08-06
- Earliest claimed: 2010-09-27
- Assignees: AGC Inc.
- Applicants: AGC Inc.
- Inventors: Jun Endo; Shusaku Akiba; Kazutaka Ono; Tetsuya Nakashima
- Web page: https://patentgrep.com/patent/US10370286B2

## CPC

- C03C 3/085: containing an oxide of a divalent metal
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 21/00: Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C 21/001: {in liquid phase, e.g. molten salts, solutions}
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- C03C 3/091: containing aluminium
- G02F 1/133302: {Rigid substrates, e.g. inorganic substrates}
- Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- 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
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

To provide glass to be used for chemically tempered glass, of which the strength is less likely to be reduced even when indentations are formed thereon. Glass for chemical tempering, which comprises, as represented by mole percentage based on oxides, from 62 to 68% of SiO2, from 6 to 12% of Al2O3, from 7 to 13% of MgO, from 9 to 17% of Na2O, and from 0 to 7% of K2O, wherein the difference obtained by subtracting the content of Al2O3 from the total content of Na2O and K2O is less than 10%, and when ZrO2 is contained, its content is at most 0.8%. Chemically tempered glass obtained by chemically tempering such glass for chemical tempering. Such chemically tempered glass has a compressive stress layer formed on the glass surface, which has a thickness of at least 30 μm and a surface compressive stress of at least 550 MPa.

## Claims

### Claim 1

A plate glass which comprises, as represented by mole percentage based on oxides, from 62 to 66% of SiO2, from 7.5 to 9% of Al2O3, from 8 to 13% of MgO, from 9 to 16% of Na2O, from 0.5 to 7% of K2O, 0% B2O3, 0% ZnO, and from 0 to 1% of CaO, wherein the difference obtained by subtracting the content of Al2O3 from the total content of Na2O and K2O is at most 9%, and optionally ZrO2 in an amount of at most 0.6%, wherein the plate glass has a glass transition point of at least 570° C. and a specific gravity of at most 2.55.

### Claim 2 (depends on 1)

The plate glass according to claim 1, wherein the content of CaO is from 0 to 0.5%.

### Claim 3 (depends on 1)

The plate glass according to claim 1, wherein ZrO2 is contained in an amount of at most 0.5%.

### Claim 4 (depends on 1, 2)

The plate glass according to claim 1 or 2, wherein the content of Na2O is from 9 to 12.5%.

### Claim 5 (depends on 1, 2)

The plate glass according to claim 1 or 2, wherein the content of Na2O is from 12 to 16%.

### Claim 6 (depends on 1, 2)

The plate glass according to claim 1 or 2, wherein the total content of CaO, SrO and BaO is at most 1%.

### Claim 7 (depends on 1, 2)

The plate glass according to claim 1 or 2, wherein the total content of SiO2 and Al2O3 is more than 72% and at most 76%.

### Claim 8 (depends on 1, 2)

The plate glass according to claim 1 or 2, wherein the content of MgO is from 8 to 11%.

### Claim 9 (depends on 1, 2)

The plate glass according to claim 1 or 2, wherein the content of SiO2 is from 63 to 65%.

### Claim 10 (depends on 1)

The plate glass according to claim 1, wherein the total content of Na2O and MgO is from 21 to 25%.

### Claim 11 (depends on 1)

The plate glass according to claim 1, wherein ZrO2 is contained in an amount of at most 0.6%.