Green glass composition
AssigneePPG Industries Ohio, Inc.
InventorLarry J. Shelestak
Life of this patent
Estimating the term…
Abstract
A glass composition that includes a base glass composition including: SiO2 from 65 to 75 weight percent, Na2O from 10 to 20 weight percent, CaO from 5 to 15 weight percent, MgO from 0 to 5 weight percent, Al2O3 from 0 to 5 weight percent, K2O from 0 to 5 weight percent, and a colorant and property modifying portion including total iron ranging from of equal to or less than 0.6 weight percent; and TiO2 ranging from 0.1 to 1.0 weight percent, wherein the redox ratio ranges from 0.33 to 0.45 and the weight percents are based on the total weight of the composition.
Claims7
A glass sheet comprising:
- a base glass composition comprising:
- SiO2
- 65 to 75 weight percent,
- Na2O
- 10 to 20 weight percent,
- CaO
- 5 to 15 weight percent,
- MgO
- 0 to 5 weight percent,
- Al2O3
- 0 to 5 weight percent, and
- K2O
- 0 to 5 weight percent;
- a colorant and property modifying portion consisting essentially of:
- total iron expressed in terms of weight percentage of “Fe2O3” ranging from equal to or less than 0.60 weight percent;
- TiO2 ranging from 0.1 to 1.0 weight percent, and
- a redox ratio ranging from 0.36 to 0.42, wherein the weight percents are based on the total weight of the composition, and the redox ratio is the amount of iron in the ferrous state expressed as “FeO” divided by the amount of total iron expressed as “Fe2O3”, and
- the glass sheet exhibits the following performance properties at a thickness of 0.189 inches (4.8 mm):
- an Lta of at least 70%;
- a TSET of up to 48%;
- a SAE UV of up to 55%;
- a dominant wavelength ranging from 495 to 535 nm;
- and
- a Pe of at least 1%.
A glass sheet comprising a glass composition that includes:
- SiO2
- 65 to 75 weight percent,
- Na2O
- 10 to 20 weight percent,
- CaO
- 5 to 15 weight percent,
- MgO
- 0 to 5 weight percent,
- Al2O3
- 0 to 5 weight percent, and
- K2O
- 0 to 5 weight percent, and
- a colorant and property modifying portion consisting essentially of;
- total iron expressed in terms of weight percentage of “Fe2O3” ranging from equal to or less than 0.60 weight percent;
- TiO2 ranging from 0.1 to 1.0 weight percent, and
- redox ratio ranging from 0.37 to 0.40 wherein the weight percents are based on the total weight of the composition, and the redox ratio is the amount of iron in the ferrous state expressed as “FeO” divided by the amount of total iron expressed as “Fe2O3”, and
- wherein the glass sheet exhibits the following performance properties at a thickness of 0.189 inches (4.8 mm):
- an Lta of at least 70%;
- a TSET of up to 48%;
- a SAE UV of up to 42%;
- a dominant wavelength ranging from 495 to 500 nm;
- and
- a Pe of at least 1 percent.
A laminated glass article comprising a glass sheet made from a glass composition that includes:
- SiO2
- 65 to 75 weight percent,
- Na2O
- 10 to 20 weight percent,
- CaO
- 5 to 15 weight percent,
- MgO
- 0 to 5 weight percent,
- Al2O3
- 0 to 5 weight percent, and
- K2O
- 0 to 5 weight percent,
- and a colorant and property modifying portion consisting essentially of:
- total iron expressed in terms of weight percentage of “Fe2O3” ranging from equal to or less than 0.60 weight percent;
- TiO2 ranging from 0.1 to 1.0 weight percent, and
- redox ratio of the glass sheet ranging from 0.37 to 0.40 wherein the weight percents are based on the total weight of the composition, and the redox ratio is the amount of iron in the ferrous state expressed as “FeO” divided by the amount of total iron expressed as “Fe2O3”, and
- wherein the glass sheet exhibits the following performance properties at a thickness of 0.189 inches (4.8 mm):
- an Lta of at least 70 percent;
- a TSET of up to 48 percent;
- an SAE UV transmittance of up to 55 percent;
- a dominant wavelength ranging from 495 to 535 nm;
- and
- a Pe of at least 1 percent.
Dependencies are inferred from the claim text.