Ultraviolet-absorbing glass article

Patent metadata

Field	Value
Publication number	US-10011520-B2
Application number	US-201715450231-A
Country	US
Kind code	B2
Filing date	Mar 6, 2017
Priority date	Sep 8, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

The present invention relates to an ultraviolet-absorbing glass article containing, as represented by mass % based on oxides, as a glass matrix composition: SiO 2 : 66 to 75%, Na 2 O: 10 to 20%, CaO: 5 to 15%, MgO: 0 to 6%, Al 2 O 3 : 0 to 5%, K 2 O: 0 to 5%, FeO: 0.2 to 1.2%, total iron as represented by Fe 2 O 3 : 2.4 to 4%, and TiO 2 : more than 0% and 1% or less, containing from 50 to 400 mass ppm of CoO, containing from 0 to 70 mass ppm of Se, containing from 0 to 800 mass ppm of Cr 2 O 3 , having a total content of CoO, Se and Cr 2 O 3 of less than 0.1 mass %, and having an ultraviolet transmittance (TUV) (ISO9050:2003) of 2% or less at a thickness of 3.5 mm.

First claim

The invention claimed is:

1. An ultraviolet-absorbing glass article comprising, as represented by mass% based on oxides, as a glass matrix composition:
SiO 2 : 66 to 75%,
Na 2 O: 10 to 20%,
CaO: 5 to 15%,
MgO: 0 to 6%,
Al 2 O 3 : 0 to 5%,
K 2 O: 0 to 5%,
FeO: 0.2 to 1.2%,
total iron as represented by Fe 2 O 3 : 2.4 to 4%, and
TiO 2 : more than 0% and 1% or less,
containing from 180 to 400 mass ppm of CoO,
containing from 0 to 70 mass ppm of Se,
containing from 0 to 800 mass ppm of Cr 2 O 3 ,
having a total content of CoO, Se and Cr 2 O 3 of less than 0.1 mass %,
having an ultraviolet transmittance (TUV) (ISO9050:2003) of 2% or less at a thickness of 3.5 mm, and
having a visible light transmittance (TVA) (JIS-R3106 (1998)) of 5% to 15% at a thickness of 3.5 mm as measured by using a standard illuminant A.

2. The ultraviolet-absorbing glass article according to claim 1 , further comprising from 0 to 1 mass % of NiO.

3. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of total iron as represented by Fe 2 O 3 is 2.7 mass % or more.

4. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of total iron as represented by Fe 2 O 3 is 3.0 mass % or less.

5. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of total iron as represented by Fe 2 O 3 is 2.7 to 3.0 mass %.

6. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of FeO is 0.6 mass % or less.

7. The ultraviolet-absorbing glass article according to claim 1 , wherein the content of Se is 3 mass ppm or more.

8. The ultraviolet-absorbing glass article according to claim 1 , comprises from 0 to 1 mass % of at least one selected from the group consisting of Sb, As, Cl, and F.

9. The ultraviolet-absorbing glass article according to claim 1 , having a dark gray color.

10. The ultraviolet-absorbing glass article according to claim 1 , having an ultraviolet transmittance (TUV) (ISO 9050:2003) of 2% or less at a thickness of 2.5 mm.

11. The ultraviolet-absorbing glass article according to claim 1 , having a visible light transmittance (TVA) (JIS-R3106 (1998)) of 12% or more and 26% or less at a thickness of 2.5 mm as measured by using a standard illuminant A.

12. The ultraviolet-absorbing glass article according to claim 1 , having a solar radiation transmittance (TE) (JIS-R3106 (1998)) of 35% or less at a thickness of 2.5 mm.

13. The ultraviolet-absorbing glass article according to claim 1 , having a dominant wavelength (λD) of from 485 to 580 nm as measured by using a standard illuminant C and an excitation purity (Pe) of 35% or less as measured by using a standard illuminant C at a thickness of 2.5 mm.

14. The ultraviolet-absorbing glass article according to claim 1 , having the visible light transmittance (TVA) (JIS-R3106 (1998)) of 5% or more and 15% or less at a thickness of 3.5 mm as measured by using a standard illuminant A.

15. The ultraviolet-absorbing glass article according to claim 1 , having the visible light transmittance (TVA) (JIS-R3106 (1998)) of 14.5% or less at a thickness of 3.5 mm as measured by using a standard illuminant A.

16. The ultraviolet-absorbing glass article according to claim 1 , having the visible light transmittance (TVA) (JIS-R3106 (1998)) of 13% or less at a thickness of 3.5 mm as measured by using a standard illuminant A.

17. The ultraviolet-absorbing glass article according to claim 1 , having the visible light transmittance (TVA) (JIS-R3106 (1998)) of 7% or more and 13% or less at a thickness of 3.5 mm as measured by using a standard illuminant A.

18. The ultraviolet-absorbing glass article according to claim 1 , having a solar radiation transmittance (TE) (JIS-R3106 (1998)) of 20% or less at a thickness of 3.5 mm.

19. The ultraviolet-absorbing glass article according to claim 1 , having a dominant wavelength (λD) of from 485 to 580 nm as measured by using a standard illuminant C and an excitation purity (Pe) of 45% or less as measured by using a standard illuminant C at a thickness of 3.5 mm.

20. The ultraviolet-absorbing glass article according to claim 1 , having a dominant wavelength (λD) of 561.5 nm to 580 nm as measured by using a standard illuminant C and an excitation purity (Pe) of 45% or less as measured by using a standard illuminant C at a thickness of 3.5 mm.

Assignees

• Asahi Glass Co Ltd

Inventors

• Akada Shuichi

Classifications

• C03C4/085

  for ultraviolet absorbing glass · CPC title

• C03C3/087 Primary

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• C03C4/02

  for coloured glass · CPC title

• C03C4/08

  for glass selectively absorbing radiation of specified wave lengths · CPC title