US5385872A
Expired / Lapsed
US
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Ultraviolet absorbing green tinted glass
Assignee: Vitro SAB de CV
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Filing: 1992-03-26
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Granted: 1995-01-31
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Expires: 2012-03-26
Abstract
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 CeO2, V2O5, TiO2 or MoO3 and greater than 0.7% total iron (expressed as Fe2O3) 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.
Inventors
- 👤 Joseph A. Gulotta
- 👤 Larry J. Shelestak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:11
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/02; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C4/085
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
155 words
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis, 66-75% SiO 2 , 10-20% Na 2 O, 5-15% CaO, 0-5% MgO, 0-5% Al 2 O 3 , 0-5% K 2 O and a colorant portion consisting essentially of, on a weight percent basis, iron (expressed as Fe 2 O 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 2 O 5 , MoO 3 , CeO 2 , TiO 2 and mixtures thereof, wherein said oxide includes at least V 2 O 5 or MoO 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.
Claim 2
Dependent Claim
155 words
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis, 66-75% SiO 2 , 10-20% Na 2 O, 5-15% CaO, 0-5% MgO, 0-5% Al 2 O 3 , 0-5% K 2 O and a colorant portion consisting essentially of, on a weight percent basis, iron (expressed as Fe 2 O 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 2 O 5 , MoO 3 , CeO 2 , TiO 2 and mixtures thereof, wherein said oxide includes at least V 2 O 5 or MoO 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.
Claim 3
Dependent Claim
165 words
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis, 66-75% SiO 2 , 10-20% Na 2 O, 5-15% CaO, 0-5% MgO, 0-5% Al 2 O 3 , 0-5% K 2 O and a colorant portion consisting essentially of, on a weight percent basis, iron (expressed as Fe 2 O 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 2 O 5 , MoO 3 , CeO 2 , TiO 2 and mixtures thereof, wherein said oxide includes at least V 2 O 5 or MoO 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.
Claim 4
Dependent Claim
165 words
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis, 66-75% SiO 2 , 10-20% Na 2 O, 5-15% CaO, 0-5% MgO, 0-5% Al 2 O 3 , 0-5% K 2 O and a colorant portion consisting essentially of, on a weight percent basis, iron (expressed as Fe 2 O 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 2 O 5 , MoO 3 , CeO 2 , TiO 2 and mixtures thereof, wherein said oxide includes at least V 2 O 5 or MoO 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.
Claim 5
Dependent Claim
20 words
The glass of claim 1 wherein said colorant portion is less than 0.2 wt. % V 2 O 5 .
Claim 6
Dependent Claim
34 words
The glass of claim 1 wherein said colorant portion is less than a total of 1.0 wt. % MoO 3 and CeO 2 , with a minimum of 0.2 wt. % CeO 2 .
Claim 7
Dependent Claim
25 words
The glass of claim 1 wherein the glass exhibits a total solar energy transmittance less than 45 percent at a reference thickness of 3.9 millimeters.
Claim 8
Dependent Claim
113 words
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis: 66-75% SiO 2 , 10-20% Na 2 O, 5-15% CaO, 0-5% MgO, 0-5% Al 2 O 3 , 0-5% K 2 O and a colorant portion consisting essentially of, on a weight percent basis, CeO 2 in amount greater than 1.4% but less than 2.0% and greater than 0.7% iron (expressed as Fe 2 O 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.
Claim 9
Dependent Claim
113 words
A green tinted, ultraviolet absorbing glass having a base glass composition comprising, on a weight basis: 66-75% SiO 2 , 10-20% Na 2 O, 5-15% CaO, 0-5% MgO, 0-5% Al 2 O 3 , 0-5% K 2 O and a colorant portion consisting essentially of, on a weight percent basis, CeO 2 in amount greater than 1.4% but less than 2.0% and greater than 0.7% iron (expressed as Fe 2 O 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.
Claim 10
Dependent Claim
16 words
The glass as in claim 6 wherein the ratio of FeO/total iron is less than 0.207.
Claim 11
Dependent Claim
20 words
The glass as in claim 6 wherein the ratio of FeO/total iron is greater than 0.261 but less than 0.35.
Claim 12
Dependent Claim
25 words
The glass of claim 6 wherein the glass exhibits a total solar energy transmittance less than 45 percent at a reference thickness of 3.9 millimeters.
Claim 13
Dependent Claim
19 words
The glass of claim 2 wherein said colorant is less than 0.2 wt. % V 2 O 5 .
Claim 14
Dependent Claim
33 words
The glass of claim 2 wherein said colorant is less than a total of 1.0 wt. % MoO 3 and CeO 2 , with a minimum of 0.2 wt. % CeO 2 .
Claim 15
Dependent Claim
25 words
The glass of claim 2 wherein the glass exhibits a total solar energy transmittance less than 45 percent at a reference thickness of 3.9 millimeters.
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