Clear glass composition with erbium oxide
View Patent ↗Glass is provided so as to have high visible transmission and/or fairly clear or neutral color. In certain example embodiments, the glass includes a low amount of iron coupled with erbium (Er, including an oxide thereof) designed to provide a neutral color and high transmittance. In certain example embodiments, the amount of SO 3 in the glass composition is increased in order to provide increased visible transmission, without sacrificing neutral color. The glass may optionally include a small amount of cobalt (Co, including an oxide thereof) in certain example instances.
1. Glass comprising:
Ingredient
wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
total iron (expressed as Fe 2 O 3 )
0.02 to 0.10%
erbium oxide
0.02 to 0.15%
SO 3
0.25 to 0.40%
cerium oxide
0 to 0.08%
wherein the glass has visible transmission of at least 90%, a transmissive a* color value of from −0.8 to +0.8, and a transmissive b* color value of −0.8 to +0.9.
2. The glass of claim 1 , wherein the glass comprises from 0-0.05% cerium oxide.
3. The glass of claim 1 , wherein the glass comprises from 0-0.03% cerium oxide.
4. The glass of claim 1 , wherein the glass comprises 0% cerium oxide.
5. The glass of claim 1 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 )
0.03 to 0.09%
erbium oxide
0.02 to 0.08%
SO 3
0.26 to 0.36%
cerium oxide
0 to 0.05%.
6. The glass of claim 1 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 )
0.05 to 0.065%
erbium oxide
0.03 to 0.07%
SO 3
0.27 to 0.33%
cerium oxide
0 to 0.03%.
7. The glass of claim 1 , wherein the glass comprises from 0.26 to 0.36% SO 3 .
8. The glass of claim 1 , wherein the glass comprises from 0.27 to 0.33% SO 3 .
9. The glass of claim 1 , wherein the glass comprises less than or equal to 0.015% FeO.
10. The glass of claim 1 , wherein the glass comprises less than or equal to 0.010% FeO.
11. The glass of claim 1 , wherein the glass has visible transmission of at least 90.4%, a transmissive a* color value of from −0.5 to +0.4, and a transmissive b* color value of −0.5 to +0.7.
12. The glass of claim 1 , wherein the glass has visible transmission of at least 90.5%.
13. The glass of claim 1 , wherein the glass is substantially free of at least three of selenium, nickel, arsenic, lead, and antimony.
14. The glass of claim 1 , wherein the glass is substantially free of each of selenium, nickel, arsenic, lead, and antimony.
15. The glass of claim 1 , wherein the glass comprises from 0 to 0.4% cobalt oxide and/or neodymium oxide.
16. The glass of claim 1 , wherein the glass comprises from 0.001 to 0.1% cobalt oxide and/or neodymium oxide.
17. The glass of claim 1 , wherein the glass has a glass redox value (FeO/Fe 2 O 3 ) of no more than 0.15.
18. Glass comprising:
Ingredient
wt. %
total iron (expressed as Fe 2 O 3 )
0.02 to 0.1%
erbium oxide
0.02 to 0.15%
SO 3
0.25 to 0.40%
cerium oxide
0 to 0.08%
wherein the glass has visible transmission of at least 90%, a transmissive a* color value of from −0.8 to +0.8, and a transmissive b* color value of −0.8 to +0.9.
19. The glass of claim 18 , wherein the glass comprises from 0-0.05% cerium oxide, more preferably from 0-0.3% cerium oxide.
20. The glass of claim 18 , wherein the glass comprises:
total iron (expressed as Fe 2 O 3 )
0.03 to 0.09%
erbium oxide
0.02 to 0.08%
SO 3
0.26 to 0.36%
cerium oxide
0 to 0.05%.
21. The glass of claim 18 , wherein the glass comprises from 0.26 to 0.36% SO 3 , more preferably from 0.27 to 0.33% SO 3 .
22. The glass of claim 18 , wherein the glass is substantially free of each of selenium, nickel, arsenic, lead, and antimony.