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US 7,622,410 B2Granted
Grey glass composition
AssigneeGuardian Industries Corp.
InventorsAnthony V. Longobardo, Leonid Landa, Ksenia A. Landa, Scott V. Thomsen
Life of this patent
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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.
Claims19
A grey glass comprising:
- a base glass portion comprising:
- Ingredient
- wt. %
- SiO2
- 67-75%
- Na2O
- 10-20%
- CaO
- 5-15%
- MgO
- 0-7%
- Al2O3
- 0-7%
- K2O
- 0-7%
- and a colorant portion consisting essentially of:
- total iron (expressed as Fe2O3)
- 0.15 to 0.45%
- selenium
- <=3
- ppm
- chromium oxide
- 1-20
- ppm
- cobalt oxide
- 130-240
- ppm
- nickel oxide
- 500-1,000
- ppm
- titanium oxide
- 0 to 0.20%
- 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 erbium oxide from 0.1 to 0.8%.
33 more elements
A grey glass comprising:
- a base glass portion comprising:
- Ingredient
- wt. %
- SiO2
- 67-75%
- Na2O
- 10-20%
- CaO
- 5-15%
- MgO
- 0-7%
- Al2O3
- 0-7%
- K2O
- 0-7%
- and a colorant portion comprising:
- total iron (expressed as Fe2O3)
- 0.15 to 0.45%
- selenium
- <=3
- ppm
- chromium oxide
- 2-12
- ppm
- cobalt oxide
- 130-240
- ppm
- nickel oxide
- 500-1,000
- ppm
- titanium oxide
- 0 to 0.20%
- 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 erbium oxide from 0.1 to 0.8%.
32 more elements
A grey glass comprising:
- total iron (expressed as Fe2O3)
- 0.15 to 0.45%
- selenium
- <=3
- ppm
- chromium oxide
- 1-20
- ppm
- cobalt oxide
- 130-240
- ppm
- nickel oxide
- 500-1,000
- ppm
- titanium oxide
- 0 to 0.20%
- 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;
- wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30;
- and
- wherein the grey glass includes erbium oxide from 0.1 to 0.8%.
17 more elements
Dependencies are inferred from the claim text.