White glass

Patent metadata

Field	Value
Publication number	US-9546104-B2
Application number	US-201514732975-A
Country	US
Kind code	B2
Filing date	Jun 8, 2015
Priority date	Dec 7, 2012
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A phase-separated glass for chemical strengthening has a total light reflectance of 10% or more in a wavelength range of 380 nm to 780 nm and a value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance of more than 4.2, when measured in a form of a plate having a thickness of 1 mm.

First claim

The invention claimed is:

1. A phase-separated glass for chemical strengthening, having a total light reflectance of 10% or more in a wavelength range of 380 nm to 780 nm and a value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance of more than 4.2, when measured in a form of a plate having a thickness of 1 mm.

2. The phase-separated glass for chemical strengthening according to claim 1 , wherein when reflected light from a D65 light source is measured with respect to the phase-separated glass for chemical strengthening which has been formed into a plate having a thickness of 1 mm and placed on a white standard board having L* value of 98.44, a* value of −0.20 and b* value of 0.23 [EVER-WHITE (Code No. 9582), a product of Evers Corporation], a measured value thereof is positioned within an area enclosed in a quadrilateral specified by A(0.311, 0.319), B(0.299, 0.308), C(0.285, 0.314) and D(0.297, 0.326) in CIE chromaticity coordinates.

3. The phase-separated glass for chemical strengthening according to claim 1 , wherein a dispersed phase thereof has an average particle size of 0.08 μm or more and less than 0.2 μm.

4. The phase-separated glass for chemical strengthening according to claim 1 , comprising, in terms of mole percentage, from 50% to 80% of SiO 2 , from 0 to 7% of B 2 O 3 , from 0 to 10% of Al 2 O 3 , from 0 to 30% of MgO, from 5% to 15% of Na 2 O, from 0 to 5% of CaO, from 0 to 15% of BaO and from 0 to 10% of P 2 O 5 , wherein a total content of MgO, CaO and BaO is from 10% to 30%.

5. A chemically-strengthened phase-separated glass, which has been obtained by chemically strengthening the phase-separated glass for chemical strengthening according to claim 1 .

6. A housing, wherein a part or whole of the housing is the chemically-strengthened glass according to claim 5 .

7. The housing according to claim 6 , which is a housing of an electronic device.

8. A phase-separated glass, comprising, in terms of mole percentage, from 50% to 80% of SiO 2 , from 0 to 7% of B 2 O 3 , from 0 to 10% of Al 2 O 3 , from 0 to 30% of MgO, from 5% to 15% of Na 2 O, from 0 to 5% of CaO, from 0 to 15% of BaO and from 0 to 10% of P 2 O 5 , wherein a total content of MgO, CaO and BaO is from 10% to 30%, and having a total light reflectance of 10% or more in a wavelength range of 380 nm to 780 nm and a value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance of more than 4.2.

9. A phase-separated glass, having a total light reflectance of 10% or more in a wavelength range of 380 nm to 780 nm and a value obtained by dividing a maximum value of the total light reflectance by a minimum value of the total light reflectance of more than 4.2, when measured in a form of a plate having a thickness of 1 mm.

10. The phase-separated glass according to claim 9 , wherein when reflected light from a D65 light source is measured with respect to the phase-separated glass which has been formed into a plate having a thickness of 1 mm and placed on a white standard board having L* value of 98.44, a* value of −0.20 and b* value of 0.23 [EVER-WHITE (Code No. 9582), a product of Evers Corporation], a measured value thereof is positioned within an area enclosed in a quadrilateral specified by A(0.311, 0.319), B(0.299, 0.308), C(0.285, 0.314) and D(0.297, 0.326) in CIE chromaticity coordinates.

11. The phase-separated glass according to claim 9 , wherein a dispersed phase thereof has an average particle size of 0.08 μm or more and less than 0.2 μm.

12. The phase-separated glass according to claim 9 , comprising, in terms of mole percentage, from 50% to 80% of SiO 2 , from 0 to 7% of B 2 O 3 , from 0 to 10% of Al 2 O 3 , from 0 to 30% of MgO, from 5% to 15% of Na 2 O, from 0 to 5% of CaO, from 0 to 15% of BaO and from 0 to 10% of P 2 O 5 , wherein a total content of MgO, CaO and BaO is from 10% to 30%.

13. The phase-separated glass according to claim 12 , wherein a total content of ZrO 2 , P 2 O 5 and La 2 O 3 is from 0.5% to 10%.

14. The phase-separated glass according to claim 9 , which is for use in a building material.

15. The phase-separated glass according to claim 14 , which is for an interior use of a gallery or tunnel.

Assignees

• Asahi Glass Co Ltd

Inventors

• Miyasaka Junko
• Ohara Seiki

Classifications

• C03C4/20

  for chemical resistant glass · CPC title

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• Y10T428/315

  Surface modified glass [e.g., tempered, strengthened, etc.] · CPC title

• C03C3/078

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title