# US 10,118,858 B2 · Strengthened glass with deep depth of compression

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- Number: US 10,118,858 B2
- Document ID: US10118858B2
- Status: Granted
- Kind: B2
- Application number: 14/530,073
- Filed: 2014-10-31
- Published: 2015-08-27
- Granted: 2018-11-06
- Earliest claimed: 2014-02-24
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Jaymin Amin; Benedict Osobomen Egboiyi; Jonathan David Pesansky; Kevin Barry Reiman; Rostislav Vatchev Roussev; Brian Paul Strines
- Web page: https://patentgrep.com/patent/US10118858B2

## CPC

- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- C03C 3/04: containing silica
- C03C 3/085: containing an oxide of a divalent metal
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/091: containing aluminium
- C03C 3/093: containing zinc or zirconium
- C03C 3/095: containing rare earths
- C03C 3/097: containing phosphorus, niobium or tantalum
- C03C 4/18: for ion-sensitive glass
- C03C 21/00: Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- G06F 1/1637: {Details related to the display arrangement, including those related to the mounting of the display in the housing}
- C03C 2204/00: Glasses, glazes or enamels with special properties
- G06F 2200/1634: Integrated protective display lid, e.g. for touch-sensitive display in handheld computer
- H04B 1/3827: Portable transceivers
- 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
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04B: TRANSMISSION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The strengthened glass has a 60% survival rate when dropped from a height of 80 cm in an inverted ball test and a peak load at failure of at least 10 kgf as determined by abraded ring-on-ring testing.

## Claims

### Claim 1

A glass article, the glass article comprising a thickness t in a range from about 0.15 mm up to about 2.0 mm and a compressive region having a compressive stress CS of from about 100 MPa up to about 1200 MPa at a surface of the glass article, wherein:
a. the compressive region extends from the surface to a depth of compression DOC, wherein DOC≥0.1·t when t<0.5 mm and DOC 50 μm when t≥0.5 mm, and wherein the compressive region has a compressive stress profile;
b. the compressive region has a compressive stress profile having a first portion having a first slope, wherein the first slope is less than or equal to about −2 MPa/μm and greater than or equal to about −8 MPa/μm; and
c. a second portion extending from the surface to a least about 3 μm and up to about 15 μm within the glass article and having a second slope, and wherein the second slope is less than or equal to −40 MPa/μm and greater than or equal to −200 MPa/μm,
wherein the glass article that has had a surface sandblasted with abrasive material at a load of 15 psi for 5 seconds has a peak load at failure of at least about 10 kgf as determined by abraded ring-on-ring testing wherein a ratio of a diameter of a loading ring D1 to a diameter of a support ring D2 is about 0.5.

### Claim 2 (depends on 1)

The glass article of claim 1, wherein the first slope is less than or equal to about −3 MPa/μm and greater than or equal to about −6 MPa/μm.

### Claim 3 (depends on 1)

The glass article of claim 1, wherein DOC≥0.11·t when t<0.5 mm and 55 μm≤DOC≤100 μm when t≥0.5 mm.

### Claim 4 (depends on 1)

The glass article of claim 1, wherein the glass article comprises an alkali aluminosilicate glass.

### Claim 5 (depends on 4)

The glass article of claim 4, wherein the alkali aluminosilicate glass further comprises up to about 10 mol % Li2O.

### Claim 6 (depends on 4)

The glass article of claim 4, where the alkali aluminosilicate glass comprises at least about 4 mol % P2O5 and from 0 mol % to about 4 mol % B2O3, wherein 1.3<[(P2O5+R2O)/M2O3]≤2.3, where M2O3=Al2O3+B2O3, and R2O is the sum of monovalent cation oxides present in the alkali aluminosilicate glass.

### Claim 7 (depends on 4)

The glass article of claim 4, wherein the glass consists essentially of from about 40 mol % to about 70 mol % SiO2; from about 11 mol % to about 25 mol % Al2O3; from about 4 mol % to about 15 mol % P2O5; from about 13 mol % to about 25 mol % Na2O; from about 13 to about 30 mol % RxO, wherein RxO is the sum of the alkali metal oxides, alkaline earth metal oxides, and transition metal monoxides present in the glass; from about 11 to about 30 mol % M2O3, where M2O3=Al2O3+B2O3; from 0 mol % to about 1 mol % K2O; from 0 mol % to about 4 mol % B2O3, and 3 mol % or less of one or more of TiO2, MnO, Nb2O5, MoO3, Ta2O5, WO3, ZrO2, Y2O3, La2O3, HfO2, CdO, SnO2, Fe2O3, CeO2, As2O3, Sb2O3, Cl, and Br; and 1.3<[(P2O5+R2O)/M2O3]≤2.3, where R2O is the sum of monovalent cation oxides present in the glass.

### Claim 8 (depends on 4)

The alkali aluminosilicate glass of claim 4, wherein the glass is lithium-free.

### Claim 9 (depends on 1)

The glass article of claim 1, wherein the compressive stress CS at the surface is in a range from about 700 MPa to about 1200 MPa.

### Claim 10 (depends on 1)

An electronic device comprising the glass article of claim 1.

### Claim 11 (depends on 1)

The glass article of claim 1, wherein the thickness t is in a range from about 0.15 mm and up to about 1.0 mm.

### Claim 12 (depends on 1)

The glass article of claim 1, wherein the peak load at failure is at least about 20 kgf.