Ultraviolet absorbing green tinted glass
AssigneePPG Industries, Inc.
InventorsJoseph A. Gulotta, Larry J. Shelestak
Life of this patent
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Abstract
A green tinted, ultraviolet absorbing glass is disclosed having a standard soda-lime-silica base glass composition and a colorant portion consisting essentially of on a weight basis: less than 2.0% total CeO.sub.2, V.sub.2 O.sub.5, TiO.sub.2 or MoO.sub.3 and greater than 0.7% total iron (expressed as Fe.sub.2 O.sub.3) with the ratio of FeO/total iron less than 0.35. The glass reduces the amount of costly cerium required to yield low ultraviolet transmittance, viz., no greater than 31 percent (300 to 390 nanometers) at a reference thickness of 3.9 millimeters.
Claims12
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis, 66-75% SiO.sub.2, 10-20% Na.sub.2 O, 5-15% CaO, 0-5% MgO, 0-5% Al.sub.2 O.sub.3, 0-5% K.sub.2 O and a colorant portion consisting essentially of, on a weight percent basis,
- iron (expressed as Fe.sub.2 O.sub.3) in an amount greater than 0.7% with the ratio of FeO/total iron less than 0.35, and
- oxide selected from a group consisting of V.sub.2 O.sub.5, MoO.sub.3, CeO.sub.2, TiO.sub.2 and mixtures thereof, wherein said oxide includes at least V.sub.2 O.sub.5 or MoO.sub.3, and said oxide being in sufficient amount but less than 2% to produce glass exhibiting ultraviolet transmittance no greater than 31 percent (300 to 390 nanometers) and luminous transmittance (illuminant A) of at least 70 percent, both at a reference thickness of 3.9 millimeters.
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis, 66-75% SiO.sub.2, 10-20% Na.sub.2 O, 5-15% CaO, 0-5% MgO, 0-5% Al.sub.2 O.sub.3, 0-5% K.sub.2 O and a colorant portion consisting essentially of, on a weight percent basis,
- iron (expressed as Fe.sub.2 O.sub.3) in an amount greater than 0.7% with the ratio of FeO/total iron less than 0.35, and
- oxide selected from a group consisting of V.sub.2 O.sub.5, MoO.sub.3, CeO.sub.2, TiO.sub.2 and mixtures thereof, wherein said oxide includes at least V.sub.2 O.sub.5 or MoO.sub.3, and said oxide being in sufficient amount but less than 2% to produce glass exhibiting ultraviolet transmittance no greater than 31 percent (300 to 390 nanometers) and luminous transmittance (illuminant A) of at least 70 percent, both at a reference thickness of 3.9 millimeters, and exhibiting a dominant wavelength from 495 to 535 nanometers.
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis:
- 66-75% SiO.sub.2, 10-20% Na.sub.2 O, 5-15% CaO, 0-5% MgO, 0-5% Al.sub.2 O.sub.3, 0-5% K.sub.2 O and a colorant portion consisting essentially of, on a weight percent basis, CeO.sub.2 in amount greater than 1.4% but less than 2.0% and greater than 0.7% iron (expressed as Fe.sub.2 O.sub.3) with the ratio of FeO/total iron less than 0.35, and exhibiting ultraviolet transmittance no greater than 31 percent (300 to 390 nanometers) and luminous transmittance (illuminant A) of at least 70 percent, both at a reference thickness of 3.9 millimeters.
Dependencies are inferred from the claim text.