High luminous transmittance glass sheet with achromatic edges

Patent metadata

Field	Value
Publication number	US-11279648-B2
Application number	US-201615735618-A
Country	US
Kind code	B2
Filing date	Jun 3, 2016
Priority date	Jun 18, 2015
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

The invention relates to glass sheet having a composition comprising the following in weight percentage, expressed with respect to the total weight of glass: Total iron (expressed in the form of Fe2O3) 0.002-0.15% Selenium (expressed in the form of Se) 0.0003-0.005% Cobalt (expressed in the form of Co) 0.00005-0.0015%; the glass sheet being characterized in that: N≤10.3*Fe2O3+0.11; N being defined as Formula (I). Such a glass sheet has a high luminous transmittance and has colorless/achromatic edges (very neutral in color). This invention is particularly suitable due to its aesthetics as building glass or interior glass, like for example in furniture applications.

First claim

The invention claimed is:

1. A glass sheet having a composition comprising, in weight percentage, expressed with respect to the total weight of glass:

SiO 2
60-78
wt %;

Al 2 O 3
0-8
wt %;

B 2 O 3
0-4
wt %;

CaO
0-15
wt %;

MgO
0-10
wt %;

Na 2 O
5-20
wt %;

K 2 O
0-10
wt %;

BaO
0-5
wt %,

total iron, expressed in the form of Fe 2 O 3 : 0.002-0.06 wt %,
selenium, expressed in the form of Se: 0.0003-0.005 wt %, and
cobalt, expressed in the form of Co: 0.00005-0.0015 wt %;
wherein: N≤10.3×Fe 2 O 3 +0.11; N being defined as N=√(a* 2 +b* 2 ), and Fe 2 O 3 being the total iron content expressed in weight percentage.

2. The glass sheet according to claim 1 , having a composition comprising: total iron 0.002-0.04 wt %.

3. The glass sheet according to claim 1 , having a composition comprising: total iron 0.002-0.02 wt %.

4. The glass sheet according to claim 1 , having a composition comprising: total iron 0.002-0.01 wt %.

5. The glass sheet according to claim 1 , having a composition comprising: Co 0.00005-0.001 wt %.

6. The glass sheet according to claim 1 , having a composition comprising: Se 0.0004-0.005 wt %.

7. The glass sheet according to claim 1 , having a composition comprising: Se 0.0004-0.003 wt %.

8. The glass sheet according to claim 1 , having a composition comprising: Se 0.0004-0.002 wt %.

9. The glass sheet according to claim 1 , having a composition comprising: Se 0.0005-0.005 wt %.

10. The glass sheet according to claim 1 , having a composition comprising: Se 0.0005-0.003 wt %.

11. The glass sheet according to claim 1 , having a composition comprising: Se 0.0005-0.002 wt %.

12. The glass sheet according to claim 1 , having a composition comprising: 0.003×Fe 2 O 3 ≤Co≤0.03×Fe 2 O 3 ; Fe 2 O 3 being the total iron content expressed as Fe 2 O 3 in weight percentage and Co being the cobalt content expressed as Co in weight percentage.

13. A glass sheet having a composition comprising, in weight percentage, expressed with respect to the total weight of glass:

SiO 2
60-78
wt %;

Al 2 O 3
0-8
wt %;

B 2 O 3
0-4
wt %;

CaO
0-15
wt %;

MgO
0-10
wt %;

Na 2 O
5-20
wt %;

K 2 O
0-10
wt %;

BaO
0-5
wt %,

total iron, expressed in the form of Fe 2 O 3 : 0.002-0.10 wt %,
selenium, expressed in the form of Se: 0.0003-0.005 wt %, and
cobalt, expressed in the form of Co: 0.00005-0.0015 wt %;
wherein: N≤10.3×Fe 2 O 3 +0.11; N being defined as N=√(a* 2 +b* 2 ), and Fe 2 O 3 being the total iron content expressed in weight percentage, and
wherein the glass sheet has a total light transmission with illuminant D65 for a sheet thickness of 4 mm (TLD4) at a solid angle of observation of 2° (according to standard ISO9050) higher than 80%.

14. The glass sheet according to claim 13 , having a composition comprising: total iron 0.002-0.06 wt %.

15. The glass sheet according to claim 13 , having a composition comprising: 0.003×Fe 2 O 3 ≤Co≤0.03×Fe 2 O 3 ; Fe 2 O 3 being the total iron content expressed as Fe 2 O 3 in weight percentage and Co being the cobalt content expressed as Co in weight percentage.

16. A glass sheet having a composition comprising, in weight percentage, expressed with respect to the total weight of glass:

SiO 2
65-78
wt %;

Al 2 O 3
1-3
wt %;

B 2 O 3
0-4
wt %;

CaO
4-10
wt %;

MgO
0-6
wt %;

Na 2 O
8-15
wt %; and

K 2 O
1-6
wt %;

a (K 2 O/(K 2 O+Na 2 O)) ratio ranging from 0.1 to 0.5,
total iron, expressed in the form of Fe 2 O 3 : 0.002-0.06 wt %,
selenium, expressed in the form of Se: 0.0003-0.005 wt %, and
cobalt, expressed in the form of Co: 0.00005-0.0015 wt %;
wherein: N≤10.3×Fe 2 O 3 +0.11; N being defined as N=√(a* 2 +b* 2 ), and Fe 2 O 3 being the total iron content expressed in weight percentage.

Assignees

• Agc Glass Europe

Inventors

• Lambricht Thomas
• Dogimont Audrey
• Degand Aline

Classifications

• 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

• C03C4/0092

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