Grey glass composition
View Patent ↗A grey glass composition employing as its colorant portion at least iron (Fe 2 O 3 /FeO), cobalt and possibly erbium oxide (e.g., Er 2 O 3 ) is provided. The glass enables high visible transmission, and satisfactory IR absorption, while at the same time achieving desired grey color. In certain example embodiments, the colorant portion includes: total iron (expressed as Fe 2 O 3 ): <=0.35% erbium oxide (e.g., Er 2 O 3 ): 0 to 0.3% selenium (Se): <=15 ppm cobalt oxide (e.g., Co 3 O 4 ): 5 to 60 ppm glass redox: >=0.35. In other example embodiments, the glass may include higher total iron and/or a lower minimum redox.
1. A grey glass comprising:
a base glass portion comprising:
Ingredient
wt. %
SiO 2
67–75%
Na 2 O
10–20%
CaO
5–15%
MgO
0–7%
Al 2 O 3
0–7%
K 2 O
0–7%
and a colorant portion consisting essentially of:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.35%
erbium oxide
0.05 to 0.25%
selenium (Se)
<=15
ppm
cobalt oxide
5 to 60
ppm
wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.35, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, and an excitation purity (Pe) of no greater than 4.5%.
2. The glass of claim 1 , wherein the glass has a dominant wavelength of from 470 to 555 nm, and an excitation purity (Pe) of no greater than 3.0%.
3. The glass of claim 2 , wherein said dominant wavelength and excitation purity are measured at a nominal thickness of the glass of anywhere from 3 mm to 4 mm, and wherein the glass has a dominant wavelength of from 480 to 520 nm and an excitation purity (Pe) of no greater than 2.5%.
4. The glass of claim 1 , wherein the glass is substantially free of cerium, nickel, titanium and chromium.
5. The glass of claim 1 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.40.
6. The glass of claim 1 , wherein the glass has a redox (FeO/Fe 2 O 3 ) of at least 0.46.
7. The glass of claim 1 , wherein said colorant portion consists essentially of:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.29%
erbium oxide
0.05 to 0.25%
selenium (Se)
<=15
ppm
cobalt oxide
12 to 50
ppm.
8. The glass of claim 1 , wherein the glass has a visible transmission Lta of at least about 70%.
9. The glass of claim 1 , wherein said colorant portion consists essentially of:
total iron (expressed as Fe 2 O 3 )
0.10 to 0.28%
erbium oxide
0.10 to 0.20%
selenium (Se)
<=8
ppm
cobalt oxide
15 to 35
ppm.
10. The glass of claim 1 , wherein the glass has an IR % transmission of no greater than 50%.
11. The glass of claim 1 , wherein the glass has an IR % transmission of no greater than 47%, and a TS % of from 45 to 60%.
12. The glass of claim 1 , wherein the glass has a color characterized as follows when measured according to Ill. D65, 10 degree observer:
a*
from −2 to +1
b*
from −2 to +2
L*
from 80 to 95.
13. A grey glass comprising:
a base glass portion comprising:
Ingredient
wt. %
SiO 2
67–75%
Na 2 O
10–20%
CaO
5–15%
MgO
0–7%
Al 2 O 3
0–7%
K 2 O
0–7%
and a colorant portion comprising:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.35%
erbium oxide
0.05 to 0.25%
selenium (Se)
<=15
ppm
cobalt oxide
5 to 60
ppm
wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.35, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, and an excitation purity (Pe) of no greater than 4.5%.
14. The glass of claim 13 , wherein the glass has a dominant wavelength of from 470 to 555 nm, and an excitation purity (Pe) of no greater than 3.0%.
15. The glass of claim 14 , wherein said dominant wavelength and excitation purity are measured at a nominal thickness of the glass of anywhere from 3 mm to 4 mm, and wherein the glass has a dominant wavelength of from 480 to 520 nm and an excitation purity (Pe) of no greater than 2.5%.
16. The glass of claim 13 , wherein the glass is substantially free of at least three of cerium, nickel, titanium and chromium.
17. The glass of claim 13 , wherein the glass has a redox (FeO/Fe 2 O 3 ) of at least 0.40.
18. The glass of claim 13 , wherein the glass has a redox (FeO/Fe 2 O 3 ) of at least 0.46.
19. The glass of claim 13 , wherein said colorant portion comprises:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.29%
erbium oxide
0.05 to 0.25%
selenium (Se)
2 to 7
ppm
cobalt oxide
12 to 50
ppm.
20. The glass of claim 13 , wherein the glass has a visible transmission Lta of at least about 70%.
21. The glass of claim 13 , wherein said colorant portion comprises:
total iron (expressed as Fe 2 O 3 )
0.10 to 0.28%
erbium oxide
0.10 to 0.20%
selenium (Se)
2 to 7
ppm
cobalt oxide
15 to 35
ppm.
22. The glass of claim 13 , wherein the glass has an IR % transmission of no greater than 50%.
23. The glass of claim 13 , wherein the glass has an IR % transmission of no greater than 47%, and a TS % of from 45 to 60%.
24. The glass of claim 13 , wherein the glass has a color characterized as follows when measured according to Ill. D65, 10 degree observer:
a*
from −2 to +1
b*
from −2 to +2
L*
from 80 to 95.
25. A glass comprising:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.35%
erbium oxide
0.05 to 0.30%
selenium (Se)
<=15
ppm
cobalt oxide
5 to 60
ppm
wherein the glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.35, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, and an excitation purity (Pe) of no greater than 4.5%.
26. The glass of claim 25 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.40, a visible transmittance (Lta) of at least 70%, and an excitation purity (Pe) of no greater than 3%.
27. A grey glass comprising:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.29%
erbium oxide
0 to 0.30%
selenium (Se)
<=15
ppm
cobalt oxide
5 to 60
ppm
wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.40, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 470 nm to 555 nm, an excitation purity (Pe) no greater than 4.5%, and wherein the glass has a color characterized as follows when measured according to Ill. D65, 10 degree observer:
a*
from −2 to +1
b*
from −2 to +2
L*
from 80 to 95.
28. The glass of claim 27 , wherein the glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.46, a visible transmittance (Lta) of at least 70%, and an excitation purity (Pe) of no greater than 3%.
29. The glass of claim 27 , wherein the glass has color characterized as follows when measured according to Ill. D65, 10 degree observer:
a*
from −2 to 0
b*
from −1.5 to +1.5
L*
from 84 to 91.
30. The glass of claim 27 , wherein the glass includes no more than 0.003% titanium oxide and no more than 0.003% chromium oxide.
31. The glass of claim 27 , wherein the glass comprises from 0.05 to 0.25% erbium oxide, and from 12 to 50 ppm cobalt oxide.
32. The glass of claim 27 , wherein the glass comprises from 2 to 7 ppm Se.
33. Grey glass comprising:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.35%
erbium oxide
0 to 0.30%
cobalt oxide
5 to 60 ppm
wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.40, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 470 nm to 555 nm, and wherein the glass has a color characterized as follows when measured according to Ill. D65, 10 degree observer:
a*
from −4 to +4
b*
from −1.5 to +1.5
34. The grey glass of claim 32 , wherein the glass comprises from 2 to 7 ppm Se.
35. Grey glass comprising:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.35%
erbium oxide
<=0.30%
cobalt oxide
5 to 60 ppm
wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.35, a visible transmittance (Lta) of at least 65%, an JR transmission of no greater than 50%, and a dominant wavelength in the range of from 435 nm to 570 nm, and wherein the glass further comprises from 0.10 to 0.20% erbium oxide.
36. The grey glass of claim 35 , wherein the glass has an JR transmission of no greater than 45%.
37. The grey glass of claim 35 , wherein the glass comprises from 2 to 7 ppm Se.
38. A grey glass including a base glass portion comprising:
Ingredient
wt. %
SiO 2
67–75%
Na 2 O
10–20%
CaO
5–15%
MgO
0–7%
Al 2 O 3
0–7%
K 2 O
0–7%
and a colorant portion comprising:
total iron (expressed as Fe 2 O 3 )
0.1 to .7%
erbium oxide
0.01 to 0.3%
selenium (Se)
2 to 15 ppm
cobalt oxide
5 to 60 ppm
wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.25, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, and an excitation purity (Pe) of no greater than 4.5%.
39. The glass of claim 38 , wherein the glass has a dominant wavelength of from 480 to 540 nm, and an excitation purity (Pe) of no greater than 3.0%.
40. The glass of claim 38 , wherein said dominant wavelength and excitation purity are measured at a nominal thickness of the glass of anywhere from 3 mm to 4 mm, and wherein the glass has a dominant wavelength of from 480 to 520 nm and an excitation purity (Pe) of no greater than 2.5%.
41. The glass of claim 38 , wherein the glass is substantially free of at least three of cerium, nickel, titanium and chromium.
42. The glass of claim 38 , wherein the glass has a redox (FeO/Fe 2 O 3 ) of at least 0.27.
43. The glass of claim 38 , wherein said colorant portion comprises:
total iron (expressed as Fe 2 O 3 )
0.35 to 0.55%
erbium oxide
0.01 to 0.15%
selenium (Se)
2 to 9 ppm
cobalt oxide
10 to 50 ppm.
44. The glass of claim 38 , wherein the glass has a visible transmission Lta of at least about 70%, and an IR % transmission of no greater than 31%.
45. The glass of claim 12 , wherein the glass has an IR % transmission of no greater than 35%, and a TS % of no greater than 50%.
46. A glass comprising:
total iron (expressed as Fe 2 O 3 )
0.1 to .7%
erbium oxide
0.01 to 0.30%
selenium (Se)
2–15 ppm
cobalt oxide
5–60 ppm
wherein the glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.25, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, an excitation purity (Pe) of no greater than 4.5%, and a % IR transmission of no greater than 31%.
47. A grey glass including a base glass portion comprising:
Ingredient
wt. %
SiO 2
67–75%
Na 2 O
10–20%
CaO
5–15%
MgO
0–7%
Al 2 O 3
0–7%
K 2 O
0–7%
and a colorant portion consisting essentially of:
total iron (expressed as Fe 2 O 3 )
0.1 to .7%
erbium oxide
0.01 to 0.3%
selenium (Se)
2 to 15 ppm
cobalt oxide
5 to 60 ppm
wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of at least 0.25, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, and an excitation purity (Pe) of no greater than 4.5%.