# US 2017/0283304 A1 · Glass sheet

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- Number: US 2017/0283304 A1
- Document ID: US20170283304A1
- Status: Published application
- Kind: A1
- Application number: 15/631,554
- Filed: 2017-06-23
- Published: 2017-10-05
- Earliest claimed: 2014-12-25
- Assignees: Asahi Glass Company, Limited
- Applicants: Asahi Glass Company, Limited
- Inventors: Shuji YAMAZAKI; Shusaku AKIBA; Seiki OHARA; Kazunari TOHYAMA
- Web page: https://patentgrep.com/patent/US20170283304A1

## CPC

- C03C 3/097: containing phosphorus, niobium or tantalum
- C03C 3/085: containing an oxide of a divalent metal
- C03C 4/18: for ion-sensitive glass
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- C03C 2204/00: Glasses, glazes or enamels with special properties
- 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

## Abstract

A glass sheet includes, as represented by mole percentage based on oxides, from 55.5 to 80% of SiO2, from 12 to 20% of Al2O3, from 8 to 25% of Na2O, 2.5% or more of P2O5, and 1% or more of an alkaline earth metal RO (RO is MgO+CaO+SrO+BaO).

## Claims

### Claim 1

A glass sheet comprising, as represented by mole percentage based on oxides, from 55.5 to 80% of SiO2, from 12 to 20% of Al2O3, from 8 to 25% of Na2O, 2.5% or more of P2O5, and 1% or more of an alkaline earth metal RO (RO is MgO+CaO+SrO+BaO).

### Claim 2 (depends on 1)

The glass sheet according to claim 1, wherein a depth at which a hydrogen amount is 1.05 times a bulk value thereof is equal to or more than 500 nm from a surface of the glass sheet.

### Claim 3 (depends on 1)

The glass sheet according to claim 1, wherein an average value of a hydrogen amount in a depth of from 500 nm to 1,000 nm from a surface of the glass sheet is equal to or more than 1.5 times a bulk value thereof.

### Claim 4 (depends on 2)

The glass sheet according to claim 2, wherein an average value of a hydrogen amount in a depth of from 500 nm to 1,000 nm from a surface of the glass sheet is equal to or more than 1.5 times a bulk value thereof.

### Claim 5 (depends on 1)

The glass sheet according to claim 1, comprising, as represented by mole percentage based on oxides, from 57 to 76.5% of SiO2, from 12 to 18% of Al2O3, from 8 to 25% of Na2O, from 2.5 to 10% of P2O5, and 1% or more of the alkaline earth metal RO.

### Claim 6 (depends on 1)

The glass sheet according to claim 1, further comprising 0.1% or more of F.

### Claim 7 (depends on 1)

The glass sheet according to claim 1, which is capable of being chemically strengthened.