Glass sheet having edges which are achromatic and luminous

Patent metadata

Field	Value
Publication number	US-11214509-B2
Application number	US-201716469932-A
Country	US
Kind code	B2
Filing date	Dec 14, 2017
Priority date	Dec 19, 2016
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A glass sheet having a composition comprising the following in weight percentage, expressed with respect to the total weight of glass:
Total iron (expressed as Fe 2 O 3 ) 20-750 ppm; Selenium (expressed as Se) 0.1-<3 ppm; Cobalt (expressed as Co) 0.05-5 ppm; and a ratio Er 2 O 3 /Fe 2 O 3 0.1-1.5.

Such a glass sheet has a high luminous transmittance and shows edges which are colorless/achromatic and very luminous/bright, while maximizing the luminous transmittance. The glass sheet is particularly suitable due to its aesthetics as building glass or interior glass.

First claim

The invention claimed is:

1. A glass sheet having a composition comprising the following:

Total iron (expressed as Fe 2 O 3 )
20-750
ppm;

Selenium (expressed as Se)
0.1-<3
ppm;

Cobalt (expressed as Co)
0.05-5
ppm; and

a ratio Er 2 O 3 /Fe 2 O 3
0.1-1.5.

2. The glass sheet according to claim 1 , wherein the composition comprises: a ratio Er 2 O 3 /Fe 2 O 3 ≤1.3.

3. The glass sheet according to claim 1 wherein the composition comprises: a ratio Er 2 O 3 /Fe 2 O 3 ≥0.2.

4. The glass sheet according to claim 1 wherein the composition comprises: Se≤2.5 ppm.

5. The glass sheet according to claim 4 , wherein the composition comprises: Se≤2 ppm.

6. The glass sheet according to claim 1 wherein the composition comprises: Er 2 O 3 ≥10 ppm.

7. The glass sheet according to claim 6 , wherein the composition comprises: Er 2 O 3 ≥20 ppm.

8. The glass sheet according to claim 7 , wherein the composition comprises: Er 2 O 3 ≤800 ppm.

9. The glass sheet according to claim 1 , wherein the composition comprises: total iron 20-600 ppm.

10. The glass sheet according to claim 9 , wherein the composition comprises: total iron 20-400 ppm.

11. The glass sheet according to claim 10 , wherein the composition comprises: Co 0.05-2 ppm.

12. The glass sheet according to claim 1 wherein the composition comprises: total iron 20-200 ppm.

13. The glass sheet according to claim 12 , wherein the composition comprises: Co 0.05-1.5 ppm.

14. The glass sheet according to claim 1 , wherein the glass sheet has a N 500mm ≤15.

15. The glass sheet according to claim 1 , wherein the glass sheet has a TLD4≥87%.

16. The glass sheet according to claim 1 , wherein the glass sheet has a N 500mm ≤12.

17. A glass sheet having a composition comprising the following:

Total iron (expressed as Fe 2 O 3 )
20-400
ppm;

Selenium (expressed as Se)
0.1-<3
ppm;

Cobalt (expressed as Co)
0.05-5
ppm; and

a ratio Er 2 O 3 /Fe 2 O 3
0.1-1.5,

wherein the glass sheet has a TLD4≥87%,
wherein the glass sheet has a N 500 mm ≤15, and
wherein the glass sheet has a half edge absorption length (HAL) of ≥171 mm.

18. A glass sheet having a composition comprising the following:

SiO 2
60-78
wt %

Al 2 O 3
0-8
wt %

B2O 3
0-4
wt %

CaO
0-15
wt %

MgO
0-10
wt %

Na 2 O
5-20
wt %

K2O
0-10
wt %

BaO
0-5
wt %

Total iron (expressed as Fe 2 O 3 )
20-200
ppm;

Selenium (expressed as Se)
0.1-<3
ppm;

Cobalt (expressed as Co)
0.05-2
ppm; and

a ratio Er 2 O 3 /Fe 2 O 3
0.2-12.5.

wherein the glass sheet has a TLD4≥88%,
wherein the glass sheet has a N 500mm ≤8,
wherein the glass sheet has a half edge absorption length (HAL) of ≥391 mm, and
wherein the glass sheet contains no other colorants other than impurities in the glass.

19. The glass sheet according to claim 1 , wherein the composition comprises: Co 2 pm-5 ppm.

20. The glass sheet according to claim 1 , comprising total iron (expressed as Fe 2 O 3 ) 400-750 ppm, and
wherein the glass sheet has a half edge absorption length (HAL) of ≥75 mm.

Assignees

• Agc Glass Europe

Inventors

• Bioul Francois
• Degand Aline
• Boland Francois

Classifications

• C03C4/0092

  for glass with improved high visible transmittance, e.g. extra-clear glass · CPC title

• C03C3/085 Primary

  containing an oxide of a divalent metal · CPC title

• C03C3/095 Primary

  containing rare earths · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• C03C3/087

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