White glass

Patent metadata

Field	Value
Publication number	US-9522841-B2
Application number	US-201514957832-A
Country	US
Kind code	B2
Filing date	Dec 3, 2015
Priority date	Jun 3, 2013
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A white glass includes, in terms of mole percentage on the basis of oxides, from 50 to 73% of SiO 2 , from 0 to 10% of B 2 O 3 , from 3 to 17% of Na 2 O, from 0.5 to 10% of at least one of Nb 2 O 5 and Gd 2 O 3 , and from 0.5 to 10% of P 2 O 5 . In the white glass, a total content RO of MgO, CaO, SrO and BaO is from 2 to 25%.

First claim

The invention claimed is:

1. A white glass comprising, in terms of mole percentage on the basis of oxides, from 50 to 73% of SiO 2 , from 0 to 10% of B 2 O 3 , from 3 to 17% of Na 2 O, from 0.5 to 10% of at least one of Nb 2 O 5 and Gd 2 O 3 , and from 0.5 to 10% of P 2 O 5 , wherein a total content RO of MgO, CaO, SrO and BaO is from 2 to 25%.

2. The white glass according to claim 1 , wherein a linear transmittance of light having a wavelength of 600 nm at a thickness of 1 mm is 0.5% or less.

3. The white glass according to claim 1 , wherein a total light reflectance of light having a wavelength of 600 nm is 70% or more.

4. The white glass according to claim 1 , wherein a surface compressive stress layer or a layer ion-exchanged from a surface thereof has a thickness of 10 μm or more.

5. The white glass according to claim 1 , comprising, in terms of mole percentage on the basis of oxides, from 55 to 65% of SiO 2 , from 0 to 8% of Al 2 O 3 , from 1 to 6% of B 2 O 3 , from 1 to 16% of MgO, from 0 to 16% of BaO, from 6 to 12% of Na 2 O, from 0 to 5% of ZrO 2 , from 1 to 8% of Nb 2 O 5 , and from 2 to 8% of P 2 O 5 , wherein a total content RO of MgO, CaO, SrO and BaO is from 2 to 20%.

6. The white glass according to claim 1 , comprising, in terms of mole percentage on the basis of oxides, from 0.5% to 2% of La 2 O 3 .

7. An electronic device comprising the white glass according to claim 1 as a housing.

8. An exterior housing member comprising the white glass according to claim 1 .

9. The white glass according to claim 1 , which comprises, in terms of mole percentage on the basis of oxides, 0.5% or more of Nb 2 O 5 .

10. The white glass according to claim 9 , wherein a linear transmittance of light having a wavelength of 600 nm at a thickness of 1 mm is 0.5% or less.

11. The white glass according to claim 9 , wherein a total light reflectance of light having a wavelength of 600 nm is 70% or more.

12. The white glass according to claim 9 , wherein a surface compressive stress layer or a layer ion-exchanged from a surface thereof has a thickness of 10 μm or more.

13. The white glass according to claim 9 , comprising, in terms of mole percentage on the basis of oxides, from 55 to 65% of SiO 2 , from 0 to 8% of Al 2 O 3 , from 1 to 6% of B 2 O 3 , from 1 to 16% of MgO, from 0 to 16% of BaO, from 6 to 12% of Na 2 O, from 0 to 5% of ZrO 2 , from 1 to 8% of Nb 2 O 5 , and from 2 to 8% of P 2 O 5 , wherein a total content RO of MgO, CaO, SrO and BaO is from 2 to 20%.

14. The white glass according to claim 9 , comprising, in terms of mole percentage on the basis of oxides, from 0.5% to 2% of La 2 O 3 .

15. An electronic device comprising the white glass according to claim 9 as a housing.

16. An exterior housing member comprising the white glass according to claim 9 .

Assignees

• Asahi Glass Co Ltd

Inventors

• Miyasaka Junko
• Ohara Seiki

Classifications

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03C1/04

  Opacifiers, e.g. fluorides or phosphates; Pigments · CPC title

• C03B32/00

  Thermal after-treatment of glass products not provided for in groups {C03B19/00} , C03B25/00 - C03B31/00 {or C03B37/00}, e.g. crystallisation, eliminating gas inclusions or other impurities; {Hot-pressing vitrified, non-porous, shaped glass products} · CPC title

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C3/095

  containing rare earths · CPC title