# US 2016/0355434 A1 · Crystallized glass and crystallized glass substrate

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- Number: US 2016/0355434 A1
- Document ID: US20160355434A1
- Status: Published application
- Kind: A1
- Application number: 15/172,844
- Filed: 2016-06-03
- Published: 2016-12-08
- Earliest claimed: 2015-06-04
- Assignees: Kabushiki Kaisha Ohara
- Applicants: Ohara Inc.
- Inventors: Kiyoyuki MOMONO
- Web page: https://patentgrep.com/patent/US20160355434A1

## CPC

- C03C 10/0045: {containing SiO2, Al2O3 and MgO as main constituents}
- B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material}
- C03C 3/085: containing an oxide of a divalent metal
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/095: containing rare earths
- C03C 3/097: containing phosphorus, niobium or tantalum
- C03C 10/0018: {containing SiO2, Al2O3 and monovalent metal oxide as main constituents}
- C03C 10/0036: {containing SiO2, Al2O3 and a divalent metal oxide as main constituents}
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- B32B 2307/412: Transparent
- B32B 2307/416: Reflective
- 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
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

Provided is a high-strength crystallized glass or substrate having a high visible light transmittance and a good color balance, which is suitable for use in protecting members of portable electronic devices, optical devices and the like. Provided is a crystallized glass comprising, in terms of mol % on an oxide basis: an SiO2 component of 30.0% or more and 70.0% or less, an Al2O3 component of 8.0% or more and 25.0%, an Na2O component of 0% or more and 25.0% or less, an MgO component of 0% or more and 25.0% or less, a ZnO component of 0% or more and 30.0% or less and a TiO2 component of 0% or more and 10.0% or less, the molar ratio [Al2O3/(MgO+ZnO)] having a value of 0.5 or more and 2.0 or less, and comprising one or more selected from RAl2O4, RTi2O5, R2TiO4, R2SiO4, RAl2Si2O8 and R2Al4Si5O18 as a crystal phase.

## Claims

### Claim 1

A crystallized glass, comprising, in terms of mol % on an oxide basis:
an SiO2 component of 30.0% or more and 70.0% or less,
an Al2O3 component of 8.0% or more and 25.0% or less,
an Na2O component of 0% or more and 25.0% or less,
an MgO component of 0% or more and 25.0% or less,
an ZnO component of 0% or more and 30.0% or less, and
a TiO2 component of 0% or more and 10.0% or less,
the molar ratio [Al2O3/(MgO+ZnO)] having a value of 0.5 or more and 2.0 or less, and
comprising one or more selected from RAl2O4, RTi2O5, R2TiO4, R2SiO4, RAl2Si2O8 and R2Al4Si5O18 as a crystal phase, provided that R is one or more selected from Zn, Mg and Fe.

### Claim 2 (depends on 1)

The crystallized glass according to claim 1, wherein the molar ratio [TiO2/Na2O] of the TiO2 component to the Na2O component in terms of mol % on an oxide basis has a value of 0 or more and 0.41 or less.

### Claim 3 (depends on 1)

The crystallized glass according to claim 1, wherein the molar ratio [MgO/Na2O] of the MgO component to the Na2O component in terms of mol % on an oxide basis has a value of 0 or more and 1.60 or less.

### Claim 4 (depends on 1)

The crystallized glass according to claim 1, wherein a light transmittance across a thickness of 1 mm at a wavelength of 500 nm including reflectance loss is more than 50%.

### Claim 5 (depends on 1)

The crystallized glass according to claim 1, wherein the difference in light transmittance across a thickness of 1 mm including reflectance loss at a wavelength of 700 nm and at a wavelength of 500 nm is within 2.0%, and the difference in light transmittance across a thickness of 1 mm including reflection loss at a wavelength of 700 nm and at a wavelength of 410 nm is within 6.0%.

### Claim 6 (depends on 1)

The crystallized glass according to claim 1, wherein the total value of the content of the MgO component and the content of the ZnO component is 1.0% or more and 30.0% or less in terms of mol % on an oxide basis.

### Claim 7 (depends on 1)

The crystallized glass according to claim 1, comprising, in terms of mol % on an oxide basis:
a B2O3 component of 0% or more and 25.0% or less,
a P2O5 component of 0% or more and 10.0% or less,
a K2O component of 0% or more and 20.0% or less,
a CaO component of 0% or more and 10.0% or less,
a BaO component of 0% or more and 10.0% or less,
an FeO component of 0% or more and 8% or less,
a ZrO2 component of 0% or more and 10.0% or less, and
an SnO2 component of 0% or more and 5.0% or less.

### Claim 8 (depends on 1)

The crystallized glass according to claim 1, comprising, in terms of mol % on an oxide basis:
an Li2O component of 0% or more and 10.0% or less,
an SrO component of 0% or more and 10.0% or less,
an La2O3 component of 0% or more and 3% or less,
a Y2O3 component of 0% or more and 3% or less,
an Nb2O5 component of 0% or more and 5% or less,
a Ta2O5 component of 0% or more and 5% or less, and
a WO3 component of 0% or more and 5% or less.

### Claim 9 (depends on 1)

A crystallized glass substrate comprising the crystallized glass according to claim 1 as a base material, and having a compressive stress layer in a surface thereof, wherein the compressive stress layer has a compressive stress value of 300 MPa or more.

### Claim 10 (depends on 9)

The crystallized glass substrate according to claim 9, wherein the compressive stress layer has a thickness of 1 μm or more.