White glass

Patent metadata

Field	Value
Publication number	US-9771300-B2
Application number	US-201514603739-A
Country	US
Kind code	B2
Filing date	Jan 23, 2015
Priority date	Jul 25, 2012
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A white glass contains, in terms of mole percentage on the basis of the following oxides, from 50 to 80% of SiO 2 , from 0 to 10% of Al 2 O 3 , from 11 to 30% of MgO, from 0 to 15% of Na 2 O and from 0.5 to 15% of P 2 O 5 .

First claim

The invention claimed is:

1. A colored glass comprising, in terms of mole percentage on the basis of the following oxides, from 50 to 80% of SiO 2 , from 2 to 10% of Al 2 O 3 , from 11 to 30% of MgO, from 0 to 15% of Na 2 O and from 0.5 to 15% of P 2 O 5 and in terms of mass percentage, more than 10% of MgO.

2. The colored glass according to claim 1 , wherein a content of Al 2 O 3 is 8% or less.

3. The colored glass according to claim 1 , comprising from 3 mole % to 10 mole % of Al 2 O 3 .

4. The colored glass according to claim 1 , wherein a content of SiO 2 is 55% or more.

5. The colored glass according to claim 1 , wherein a content of Na 2 O is 1% or more.

6. The colored glass according to claim 1 , comprising 10% or less of P 2 O 5 .

7. The colored glass according to claim 1 , comprising 3% or more of P 2 O 5 .

8. The colored glass according to claim 1 , comprising from 0 to 9% of B 2 O 3 .

9. The colored glass according to claim 1 , comprising from 0 to 6% of B 2 O 3 .

10. The colored glass according to claim 1 , comprising from 0 to 4.5% of ZrO 2 .

11. The colored glass according to claim 1 , comprising from 0 to 5% of La 2 O 3 .

12. The colored glass according to claim 1 , comprising at least one of CaO, SrO and BaO in a total amount of from 0.2 to 12%.

13. The colored glass according to claim 12 , comprising CaO in a range of from 0.2 to 3%.

14. The colored glass according to claim 1 , wherein MgO/SiO 2 which is a ratio of a content of MgO to a content of SiO 2 is 0.45 or less and 0.14 or more.

15. The colored glass according to claim 1 , comprising from 66 to 72% of SiO 2 , from 2 to 4% of Al 2 O 3 , from 16 to 24% of MgO and from 4 to 10% of Na 2 O.

16. The colored glass according to claim 1 , comprising 58% or more and less than 66% of SiO 2 , from 2 to 6% of Al 2 O 3 , from 11 to 18% of MgO, from 8 to 13% of Na 2 O, and from 3 to 7% of P 2 O 5 .

17. The colored glass according to claim 1 , comprising, in terms of mole percentage on the basis of the following oxides, from 60 to 73% of SiO 2 , from 2 to 5% of Al 2 O 3 , from 13 to 30% of MgO, from 0 to 13% of Na 2 O and from 0.5 to 4.5% of P 2 O 5 .

18. The colored glass according to claim 1 , wherein a crystal is not precipitated.

19. The colored glass according to claim 1 , wherein a linear transmittance of light having a wavelength of 600 nm at a thickness of 1 mm is 50% or less.

20. The colored glass according to claim 1 , wherein a total light reflectance of light having a wavelength of 600 nm is 30% or more.

21. A strengthened white glass obtained by chemically strengthening the white glass according to claim 1 , the white glass comprising 1% or more of Na 2 O, the strengthened white glass having a surface compressive stress layer having a thickness of 10 μm or more.

22. The strengthened white glass according to claim 21 , wherein a total reflectance of light having a wavelength of 600 nm is 30% or more.

23. A method for manufacturing a strengthened white glass having a linear transmittance of light having a wavelength of 600 nm at a thickness of 1 mm of 50% or less, a surface compressive stress layer having a thickness of 10 μm or more, and a surface compressive stress thereof of 300 MPa or more, the method comprising chemically strengthening the white glass according to claim 1 .

24. A colored glass comprising, in terms of mole percentage on the basis of the following oxides, from 66 to 72% of SiO 2 , from 2 to 4% of Al 2 O 3 , from 16 to 24% of MgO, from 4 to 10% of Na 2 O and from 0.5 to 15% of P 2 O 5 .

Assignees

• Asahi Glass Co Ltd

Inventors

• Sakagami Takahiro
• Ohara Seiki
• Miyasaka Junko
• Hijiya Hiroyuki
• Ono Kazutaka

Classifications

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03C4/02

  for coloured glass · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• C03C21/002

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

• Y10T428/315

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