US2001025002A1PendingUtilityA1
Gray glass composition
Priority: Nov 16, 1993Filed: Dec 22, 2000Published: Sep 27, 2001
Est. expiryNov 16, 2013(expired)· nominal 20-yr term from priority
C03C 4/02C03C 3/087C03C 3/095C03C 4/085Y10S501/905
42
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Claims
Abstract
The present invention provides a glass composition having a neutral gray color and a luminous (visible) transmittance within a range that allows the glass to be used as privacy glazing in a vehicle. The glass of the present invention has a standard soda-lime-silica flat glass base composition and uses iron, cobalt and selenium, and optionally nickel, as the colorants. It has also been found that a nickel-free, neutral gray colored glass with a luminous transmittance (C.I.E. illuminant A) of up to 40% at a thickness of 3.9 millimeters may be attained by using as colorants: 0.59 to 0.99 wt. % of the total glass Fe 2 O 3 (total iron), no greater than 0.30 wt. % FeO; 60 to 180 PPM CoO and 5 to 30 PPM Se. It has been found that a nickel-bearing, neutral gray colored glass with a luminous transmittance (C.I.E. illuminant A) of up to but less than 40% at a thickness of 3.9 millimeters may be attained by using as colorants: 0.35 to 1.1 wt. % of the total glass Fe 2 O 3 (total iron), no greater than 0.30 wt. % FeO; 60 to 180 PPM CoO; 1 to 30 PPM Se; and 25 to 550 PPM NiO.
Claims
exact text as granted — not AI-modifiedWe claim:
1 . A neutral gray colored glass composition having a base glass portion comprising:
SiO 2 66 to 75 percent by weight Na 2 O 10 to 20 CaO 5 to 15 MgO 0 to 5 Al 2 O 3 0 to 5 K 2 O 0 to 5
and a colorant portion consisting essentially of:
Fe 2 O 3 (total iron) 0.6 to 0.935 percent by weight FeO up to 0.30 CoO 60 to 180 PPM Se 5 to 30 PPM
the glass having a luminous transmittance of 20 to 39.28 percent at a thickness of 3.9 millimeters.
2 . The composition as in claim 1 wherein the Fe 2 O 3 concentration is from 0.71 to 0.935 weight percent, the FeO concentration is from 0.181 to 0.285 weight percent, the CoO concentration is from 75 to 150 PPM and the Se concentration is from 11 to 24 PPM.
3 . The composition of claim 1 wherein the color of the glass is characterized by dominant wavelengths in the range of 480 to 580 nanometers and an excitation purity of no higher than 8% at a thickness of 3.9 millimeters.
4 . The composition of claim 3 wherein the color of the glass is characterized by dominant wavelengths in the range of 485 to 540 nanometers and an excitation purity of no higher than 3 percent.
5 . The composition as in claim 1 further including additional ultraviolet absorbing material.
6 . The composition as in claim 5 wherein said ultraviolet absorbing material is an oxide of a material selected from a group consisting essentially of cerium, vanadium, titanium and molybdenum and combination thereof in an amount up to 2.0 wt. % of the glass composition.
7 . The composition as in claim 6 wherein said TiO 2 is in an amount from 0.1 to 1.0 wt. %.
8 . The composition as in claim 7 wherein said TiO 2 is in an amount from 0.2 to 0.5 wt. %.
9 . A glass sheet made from the composition as recited in claim 1 .
10 . The glass sheet as in claim 9 wherein the sheet has a thickness between 3 to 6 mm.
11 . The glass sheet as in claim 9 wherein the color of the glass is characterized by dominant wavelengths in the range of 480 to 580 nanometers and an excitation purity of no higher than 8% at a thickness of 3.9 millimeters.
12 . The glass sheet as in claim 11 wherein the color of the glass is characterized by dominant wavelengths in the range of 485 to 540 nanometers and an excitation purity of no higher than 3 percent.
13 . A neutral gray colored glass composition having a base glass portion comprising:
SiO 2 66 to 75 percent by weight Na 2 O 10 to 20 CaO 5 to 15 MgO 0 to 5 Al 2 O 3 0 to 5 K 2 O 0 to 5
and a colorant portion consisting essentially of:
Fe 2 O 3 (total iron) 0.6 to 1.1 percent by weight FeO up to 0.30 CoO 60 to 180 PPM Se 10 to 30 PPM NiO 25 to 550 PPM
the glass having a luminous transmittance of 20 to 44.5 percent at a thickness of 3.9 millimeters.
14 . The composition as in claim 13 wherein the Fe 2 O 3 concentration is from 0.71 to 0.94 weight percent, the FeO concentration is from 0.181 to 0.24 weight percent, the CoO concentration is from 98 to 150 PPM and the Se concentration is from 14 to 24 PPM and the NiO concentration is at least 50 PPM.
15 . The composition of claim 13 wherein the color of the glass is characterized by dominant wavelengths in the range of 502 to 580 nanometers and an excitation purity of no higher than 8% at a thickness of 3.9 millimeters.
16 . The composition of claim 15 wherein the color of the glass is characterized by dominant wavelengths in the range of 502 to 540 nanometers and an excitation purity of no higher than 3 percent.
17 . The composition as in claim 13 further including additional ultraviolet absorbing material.
18 . The composition as in claim 17 wherein said ultraviolet absorbing material is an oxide of a material selected from a group consisting essentially of cerium, vanadium, titanium and molybdenum and combination thereof in an amount up to 2.0 wt. % of the glass composition.
19 . The composition as in claim 1 8 wherein said TiO 2 is in an amount from 0.1 to 1.0 wt. %.
20 . The composition as in claim 19 wherein said TiO 2 is in an amount from 0.2 to 0.5 wt. %.
21 . A glass sheet made from the composition as recited in claim 13 .
22 . The glass sheet as in claim 21 wherein the sheet has a thickness between 3 to 6 mm.
23 . The glass sheet as in claim 21 wherein the color of the glass is characterized by dominant wavelengths in the range of 502 to 580 nanometers and an excitation purity of no higher than 8% at a thickness of 3.9 millimeters.
24 . The glass sheet as in claim 23 wherein the color of the glass is characterized by dominant wavelengths in the range of 502 to 540 nanometers and an excitation purity of no higher than 3 percent.
25 . A neutral gray colored glass composition having a base glass portion comprising:
SiO 2 66 to 75 percent by weight Na 2 O 10 to 20 CaO 5 to 15 MgO 0 to 5 Al 2 O 3 0 to 5 K 2 O 0 to 5
and a colorant portion consisting essentially of:
Fe 2 O 3 (total iron) 0.59 to 0.99 percent by weight FeO up to 0.30 CoO 60 to 180 PPM Se 5 to 30 PPM
the glass having a luminous transmittance of up to 40 percent at a thickness of 3.9 millimeters.
26 . The composition as in claim 25 wherein the Fe 2 O 3 concentration is from 0.75 to 0.86 weight percent, the FeO concentration is from 0.18 to 0.25 weight percent, the CoO concentration is from 108 to 114 PPM and the Se concentration is from 13 to 24 PPM.
27 . The composition of claim 26 wherein the color of the glass is characterized by dominant wavelengths in the range of 485 to 560 nanometers and the corresponding complementary wavelengths and an excitation purity of no higher than 8% at a thickness of 3.9 millimeters.
28 . The composition of claim 27 wherein the glass is characterized by an excitation purity of no higher than 3 percent.
29 . A neutral gray colored glass composition having a base glass portion comprising:
SiO 2 66 to 75 percent by weight Na 2 O 10 to 20 CaO 5 to 15 MgO 0 to 5 Al 2 O 3 0 to 5 K 2 O 0 to 5
and a colorant portion consisting essentially of:
Fe 2 O 3 (total iron) 0.35 to 1.1 percent by weight FeO up to 0.30 CoO 60 to 180 PPM Se 1 to 30 PPM NiO 25 to 550 PPM
the glass having a luminous transmittance of less than 45 percent at a thickness of 3.9 millimeters.
30 . The composition of claim 29 wherein the color of the glass is characterized by dominant wavelengths in the range of 485 to 560 nanometers and the corresponding complementary wavelengths and an excitation purity of no higher than 8% at a thickness of 3.9 millimeters.
31 . The composition of claim 30 wherein the glass is characterized by an excitation purity of no higher than 3 percent.Join the waitlist — get patent alerts
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