Transparent glass having blue edge color
AssigneePPG Industries Ohio, Inc.
InventorRobert B. Heithoff
Life of this patent
Estimating the term…
Abstract
A method is provided for making clear glass having an azure edge coloration and low amber surface coloration in a non-vacuum float glass system. The method includes processing batch materials in a non-vacuum float glass system to provide a final glass product including: SiO2 65-75 wt. %; Na2O 10-20 wt. %; CaO 5-15 wt. %; MgO 0-5 wt. %; Al2O3 0-5 wt. %; K2O 0-5 wt. %; a colorant portion having total iron (Fe2O3) of 0-0.02 wt. %, CoO of 0-5 ppm, Nd2O3 of 0-0.1 wt. %, and CuO of 0-0.03 wt. %. The glass has a redox ratio in the range of 0.2 to 0.6, and can have a retained sulfur content of less than or equal to 0.2 wt. %, such as less than or equal to 0.11 wt. %.
Claims32
A method of making clear glass having an azure edge coloration and low amber surface coloration in a non-vacuum float glass system, comprising:
- providing a non-vacuum float glass system having a melter and a molten metal bath;
- and
- melting batch materials to provide a final glass product comprising:
- SiO2
- 65-75 wt. %;
- Na2O
- 10-20 wt. %;
- CaO
- 5-15 wt .%;
- MgO
- 0-5 wt. %;
- Al2O3
- 0-5 wt. %;
- K2O
- 0-5 wt. %;
- and
- a colorant portion comprising:
- total iron (Fe2O3)
- 0-0.02
- wt. %;
- CoO
- 0-5
- ppm;
- Nd2O3
- 0-0.1
- wt. %;
- and
- CuO
- 0-0.03
- wt. %,
- wherein the glass has a redox ratio in the range of 0.3 to 0.6,
- wherein the glass has a retained sulfur content of less than or equal to 0.11 wt. % SO3, and
- wherein the batch materials comprise sodium sulfate and sodium nitrate, with the sodium sulfate present in an amount to provide a final glass product having less than or equal to 0.11 wt. % SO3.
A method of making clear glass in a non-vacuum float glass system, comprising:
- providing a non-vacuum float class system having a melter and a molten metal bath;
- and
- melting batch materials to provide a final glass product comprising:
- SiO2
- 65-75 wt. %;
- Na2O
- 10-20 wt. %;
- CaO
- 5-15 wt. %;
- MgO
- 0-5 wt. %;
- Al2O3
- 0-5 wt. %;
- K2O
- 0-5 wt. %;
- and
- a colorant portion comprising:
- total iron (Fe2O3)
- 0-0.02 wt. %;
- CoO
- 0-5 ppm;
- Nd2O3
- 0-0.1 wt. %;
- and
- CuO
- 0-0.03 wt. %,
- wherein the glass has a redox ratio in the range of 0.3 to 0.6 and
- wherein the batch materials are essentially free of sulfur-containing materials.
A method of making clear glass having an azure edge coloration and low amber surface coloration in a non-vacuum float glass system, comprising:
- providing a non-vacuum float glass system having a melter and a molten metal bath;
- and
- melting the batch materials to provide a final glass product comprising:
- SiO2
- 65-75 wt. %;
- Na2O
- 10-20 wt. %;
- CaO
- 5-15 wt .%;
- MgO
- 0-5 wt. %;
- Al2O3
- 0-5 wt. %;
- K2O
- 0-5 wt. %;
- CeO2
- greater than 0-0.2 wt. %;
- and
- a colorant portion comprising:
- total iron (Fe2O3)
- 0 wt. % to 0.02 wt. %;
- CoO
- 0-5 ppm;
- Nd2O3
- 0-0.1 wt. %;
- CuO
- 0-0.03 wt. %,
- wherein the glass has a redox ratio in the range of 0.3 to 0.6,
- wherein the glass has a retained sulfur content of less than or equal to 0.2 wt. % SO3,
- wherein the batch materials comprise sodium sulfate and sodium nitrate, with the sodium sulfate present in an amount to provide a final glass product having less than or equal to 0.2 wt. % SO3.
A method of making clear glass in a non-vacuum float glass system, comprising:
- providing a non-vacuum float glass system having a melter and a molten metal bath;
- melting the batch materials to provide a final glass product comprising:
- SiO2
- 65-75 wt. %;
- Na2O
- 10-20 wt. %;
- CaO
- 5-15 wt. %;
- MgO
- 0-5 wt. %;
- Al2O3
- 0-5 wt. %;
- K2O
- 0-5 wt. %;
- CeO2
- greater than 0-0.2 wt. %;
- and
- a colorant portion comprising:
- total iron (Fe2O3)
- 0.007 wt. % to 0.02 wt. %;
- CoO
- 0-5 ppm;
- Nd2O3
- 0-0.1 wt. %;
- CuO
- 0-0.03 wt. %,
- wherein the glass has a redox ratio in the range of 0.3 to 0.6, and
- wherein the batch materials are essentially free of sulfur-containing materials.
A method of making clear glass having an azure edge coloration and low amber surface coloration in a non-vacuum float glass system, comprising:
- providing a non-vacuum float glass system having a melter and a molten metal bath;
- melting batch materials to provide a final glass product comprising:
- SiO2
- 65-75 wt. %;
- Na2O
- 10-20 wt. %;
- CaO
- 5-15 wt .%;
- MgO
- 0-5 wt. %;
- Al2O3
- 0-5 wt. %;
- K2O
- 0-5 wt. %;
- and
- a colorant portion comprising:
- total iron (Fe2O3)
- 0.007 wt. % to 0.02 wt. %;
- CoO
- 0-5 ppm;
- Nd2O3
- 0-0.1 wt. %;
- and
- CuO
- 0-0.03 wt. %,
- wherein the glass has a redox ratio in the range of 0.3 to 0.6, and
- wherein the glass has a retained sulfur content of less than or equal to 0.11 wt. % SO3;
- further including treating the molten metal in the molten metal bath to remove dissolved iron such that the dissolved iron remaining in the molten metal is less than or equal to 0.05 wt. %.
Dependencies are inferred from the claim text.