Grey glass composition

• US 20060189472A1
• Filed: 02/23/2005
• Published: 08/24/2006
• Est. Priority Date: 02/23/2005
• Status: Active Grant

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: Thomsen, Scott V., Landa, Ksenia A., Longobardo, Anthony V., Landa, Leonid
• Granted Patent: US 7,622,410 B2
• Time in Patent Office: Days
• US Class Current: 501/71
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: C03C 3/095 containing rare earths

Abstract

A grey glass composition employing in its colorant portion, in certain example embodiments, iron, cobalt, nickel, and at least one of erbium and titanium. The use of erbium and/or titanium has been found to improve coloration of the grey glass, and improve tunability of the same. In certain example embodiments, the ratio of cobalt oxide to nickel oxide is from 0.22 to 0.30 in order to achieve desired coloration in certain example embodiments.

Claims

1. A grey glass comprising:

a base glass portion comprising;

Ingredientwt. %SiO₂67-75%Na₂O10-20%CaO 

5-15%MgO0-7%Al₂O₃0-7%K₂O0-7%

and a colorant portion consisting essentially of;

total iron (expressed as Fe₂O₃)0.15 to 0.45%selenium<

=3ppmchromium oxide1-20ppmcobalt oxide130-240ppmnickel oxide500-1,000ppmtitanium oxide0 to 0.20%erbium oxide0 to 1.0%

wherein the grey glass has a redox value (FeO/Fe₂O₃) of from about 0.20 to 0.40, a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm;

wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30; and

wherein the grey glass includes one or both of;

(a) erbium oxide from 0.1 to 0.8%, and (b) titanium oxide from 0.01 to 0.10%.

2. The glass of claim 1, wherein the glass comprises erbium oxide from 0.1 to 0.8%.

3. The glass of claim 1, wherein the glass comprises erbium oxide from 0.2 to 0.7%.

4. The glass of claim 1, wherein the glass comprises TiO₂ from 0.01 to 0.20%.

5. The glass of claim 1, wherein the glass comprises TiO₂ from 0.02 to 0.05%.

6. The glass of claim 1, wherein the glass has a visible transmission of from 12-18%.

7. The glass of claim 1, wherein the glass has an x color value of from 0.286 to 0.299, a y color value of from 0.304 to 0.323, and a dominant wavelength of from 470-510 nm.

8. The glass of claim 1, wherein the glass has an x color value of from 0.290 to 0.297, and a y color value of from 0.310 to 0.322.

9. The glass of claim 1, wherein the glass has a redox of from 0.26 to 0.30.

10. The glass of claim 1, wherein the ratio of cobalt oxide/nickel oxide is from 0.24 to 0.29.

11. The glass of claim 1, wherein the ratio of cobalt oxide/nickel oxide is from 0.25 to 0.28.

12. The glass of claim 1, wherein the colorant portion consists essentially of:

13. The glass of claim 1, wherein the glass is substantially free of cerium oxide, and includes less than 1 ppm of Se and/or no Se.

14. A grey glass comprising:

a base glass portion comprising;

Ingredientwt. %SiO₂67-75%Na₂O10-20%CaO 

5-15%MgO0-7%Al₂O₃0-7%K₂O0-7%

and a colorant portion comprising;

total iron (expressed as Fe₂O₃)0.15 to 0.45%selenium<

=3ppmchromium oxide2-12ppmcobalt oxide130-240ppmnickel oxide500-1,000ppmtitanium oxide 

 

0 to 0.20%erbium oxide 

 

0 to 1.0%

wherein the grey glass has a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm; and

wherein the grey glass includes one or both of;

(a) erbium oxide from 0.1 to 0.8%, and (b) titanium oxide from 0.01 to 0.10%.

15. The glass of claim 14, wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30.

16. The glass of claim 14, wherein the glass comprises erbium oxide from 0.1 to 0.8%.

17. The glass of claim 14, wherein the glass comprises TiO₂ from 0.01 to 0.20%.

18. The glass of claim 14, wherein the glass comprises TiO₂ from 0.02 to 0.05%.

19. The glass of claim 14, wherein the glass has an x color value of from 0.286 to 0.299, a y color value of from 0.304 to 0.323, and a dominant wavelength of from 470-510 nm.

20. A grey glass comprising: