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US5344798A
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Blue-colored infrared and ultraviolet radiation absorbing glass and method of producing same
Assignee: Central Glass Co Ltd
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Filing: 1992-08-13
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Granted: 1994-09-06
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Expires: 2012-08-13
Abstract
Abstract An infrared and ultraviolet radiation absorbing glass suitable for use in building and vehicle windows, which comprises, on a weight basis, 68.0-73.0% SiO 2 , 0.1-3.0% Al 2 O 3 , 7.0-11.0% CaO, 2.0-4.2% MgO, 12.0-16.0% Na 2 O, 0.5-3.0% K 2 O, 0.02-0.30% SO 3 , 0.30-0.90% total iron expressed as Fe 2 O 3 , 0.10-0.80% CeO 2 , 0-1.0% TiO 2 , 0-0.5% ZnO, 0-0.1% MnO and 0-0.01% CoO. In the glass the ratio of ferrous iron to ferric iron is from 0.8 to 2.5. The glass has a bluish tint and is well balanced in visible light transmittance, infrared radiation absorption and ultraviolet radiation absorption, and a sheet of the glass can easily be tempered by a conventional method. In producing this glass, it is favorable to use cullet of a frit glass in which the ratio of ferrous iron to ferric iron is from 2.0 to 5.0 as a part of a batch of glass compostion to be melted.
Inventors
- 👤 Shigeki Morimoto
- 👤 Tadashi Noguchi
- 👤 Masakazu Taniguchi
- 👤 Yasushi Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:49
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/085; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C4/02; C03C4/082
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
195 words
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-73.0% of SiO 2 , 0.1-3.0% of Al 2 O 3 , 7.0-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na 2 O, 0.5-3.0% of K 2 O, 0.05-0.18% of SO 3 , 0.30-0.90% of total iron expressed as Fe 2 O 3 , 0.10-0.80% of CeO 2 , 0-1.0% of TiO 2 , 0-0.5% of ZnO, 0-0.1% of MnO and 0-0.01% of CoO with provisos that the total of said essential components amounts to at least 98.0 wt % of the glass, that the total of SiO 2 and Al 2 O 3 is from 69.0 to 74.0%, that the total of CaO and MgO is from 11.0 to 15.0%, that the total of Na 2 O and K 2 O is from 13.0 to 17.0%, that the total of TiO 2 , ZnO, MnO and CoO is not more than 1.2%, that said total iron includes ferrous iron and ferric iron and that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 0.80 to 2.50.
Claim 2
Dependent Claim
195 words
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-73.0% of SiO 2 , 0.1-3.0% of Al 2 O 3 , 7.0-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na 2 O, 0.5-3.0% of K 2 O, 0.05-0.18% of SO 3 , 0.30-0.90% of total iron expressed as Fe 2 O 3 , 0.10-0.80% of CeO 2 , 0-1.0% of TiO 2 , 0-0.5% of ZnO, 0-0.1% of MnO and 0-0.01% of CoO with provisos that the total of said essential components amounts to at least 98.0 wt % of the glass, that the total of SiO 2 and Al 2 O 3 is from 69.0 to 74.0%, that the total of CaO and MgO is from 11.0 to 15.0%, that the total of Na 2 O and K 2 O is from 13.0 to 17.0%, that the total of TiO 2 , ZnO, MnO and CoO is not more than 1.2%, that said total iron includes ferrous iron and ferric iron and that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 0.80 to 2.50.
Claim 3
Dependent Claim
29 words
A glass according to claim 1, wherein the amount of said total iron expressed as Fe 2 O 3 is in the range from 0.40 to 0.80 wt %.
Claim 4
Dependent Claim
18 words
A glass according to claim 1, wherein the content of ZnO is not more than 0.1 wt %
Claim 5
Dependent Claim
17 words
A glass according to claim 1, wherein the content of MnO is not more than 350 ppm.
Claim 6
Dependent Claim
17 words
A glass according to claim 1, wherein the content of CoO is not more than 10 ppm.
Claim 7
Dependent Claim
70 words
A glass according to claim 1, wherein the glass at a thickness of 5 mm is not lower than 60% in visible light transmittance, not more than 50% in total solar radiation transmittance, not more than 25% in ultraviolet transmittance, from 5 to 11% in transmittance for infrared radiation at wavelength of 1100 nm, from 495 to 505 nm in dominant wavelength and from 5 to 9 in excitation purity.
Claim 8
Dependent Claim
195 words
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-72.0% of SiO 2 , 1.6-3.0% of Al 2 O 3 , 8.5-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na 2 O, 0.5-3.0% of K 2 O, 0.05-0.18% of SO 3 , 0.30-0.90% of total iron expressed as Fe 2 O 3 , 0.10-0.80% of CeO 2 , 0-1.0% of TiO 2 , 0-0.5% of ZnO, 0-0.1% of MnO and 0-0.01% of CoO with provisos that the total of said essential components amounts to at least 98.0 wt % of the glass, that the total of SiO 2 and Al 2 O 3 is from 69.0 to 74.0%, that the total of CaO and MgO is from 12.0 to 15.0%, that the total of Na 2 O and K 2 O is from 13.0 to 17.0%, that the total of TiO 2 , ZnO, MnO and CoO is not more than 1.2%, that said total iron includes ferrous iron and ferric iron and that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 0.80 to 2.50.
Claim 9
Dependent Claim
195 words
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-72.0% of SiO 2 , 1.6-3.0% of Al 2 O 3 , 8.5-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na 2 O, 0.5-3.0% of K 2 O, 0.05-0.18% of SO 3 , 0.30-0.90% of total iron expressed as Fe 2 O 3 , 0.10-0.80% of CeO 2 , 0-1.0% of TiO 2 , 0-0.5% of ZnO, 0-0.1% of MnO and 0-0.01% of CoO with provisos that the total of said essential components amounts to at least 98.0 wt % of the glass, that the total of SiO 2 and Al 2 O 3 is from 69.0 to 74.0%, that the total of CaO and MgO is from 12.0 to 15.0%, that the total of Na 2 O and K 2 O is from 13.0 to 17.0%, that the total of TiO 2 , ZnO, MnO and CoO is not more than 1.2%, that said total iron includes ferrous iron and ferric iron and that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 0.80 to 2.50.
Claim 10
Dependent Claim
29 words
A glass according to claim 7, wherein the amount of said total iron expressed as Fe 2 O 3 is in the range from 0.40 to 0.80 wt %.
Claim 11
Dependent Claim
23 words
A glass according to claim 8, wherein the weight ratio of said ferrous iron to said ferric iron is not more than 2.30.
Claim 12
Dependent Claim
19 words
A glass according to claim 7, wherein the content of CeO 2 is from 0.40 to 0.70 wt %.
Claim 13
Dependent Claim
18 words
A glass according to claim 7, wherein the content of ZnO is not more than 0.1 wt %.
Claim 14
Dependent Claim
17 words
A glass according to claim 7, wherein the content of MnO is not more than 350 ppm.
Claim 15
Dependent Claim
17 words
A glass according to claim 7, wherein the content of CoO is not more than 10 ppm.
Claim 16
Dependent Claim
195 words
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-73.0% of SiO 2 , 0.1-2.5% of Al 2 O 3 , 7.0-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na 2 O, 0.5-3.0% of K 2 O, 0.03-0.25% of SO 3 , 0.40-0.80% of total iron expressed as Fe 2 O 3 , 0.10-0.70% of CeO 2 , 0-1.0% of TiO 2 , 0-0.5% of ZnO, 0-0.1% of MnO and 0-0.01% of CoO with provisos that the total of said essential components amounts to at least 98.0 wt % of the glass, that the total of SiO 2 and Al 2 O 3 is from 69.0 to 74.0%, that the total of CaO and MgO is from 11.0 to 15.0%, that the total of Na 2 O and K 2 O is from 13.0 to 17.0%, that the total of TiO 2 , ZnO, MnO and CoO is not more than 1.2%, that said total iron includes ferrous iron and ferric iron and that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 1.00 to 2.00.
Claim 17
Dependent Claim
195 words
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-73.0% of SiO 2 , 0.1-2.5% of Al 2 O 3 , 7.0-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na 2 O, 0.5-3.0% of K 2 O, 0.03-0.25% of SO 3 , 0.40-0.80% of total iron expressed as Fe 2 O 3 , 0.10-0.70% of CeO 2 , 0-1.0% of TiO 2 , 0-0.5% of ZnO, 0-0.1% of MnO and 0-0.01% of CoO with provisos that the total of said essential components amounts to at least 98.0 wt % of the glass, that the total of SiO 2 and Al 2 O 3 is from 69.0 to 74.0%, that the total of CaO and MgO is from 11.0 to 15.0%, that the total of Na 2 O and K 2 O is from 13.0 to 17.0%, that the total of TiO 2 , ZnO, MnO and CoO is not more than 1.2%, that said total iron includes ferrous iron and ferric iron and that the weight ratio of said ferrous iron to said ferric iron, Fe 2+ /Fe 3+ , is in the range from 1.00 to 2.00.
Claim 18
Dependent Claim
29 words
A glass according to claim 14, wherein the amount of said total iron expressed as Fe 2 O 3 is in the range from 0.45 to 0.75 wt %.
Claim 19
Dependent Claim
23 words
A glass according to claim 15, wherein the weight ratio of said ferrous iron to said ferric iron is from 1.10 to 1.70.
Claim 20
Dependent Claim
19 words
A glass according to claim 14, wherein the content of CeO 2 is not less than 0.45 wt %.
Claim 21
Dependent Claim
18 words
A glass according to claim 14, wherein the content of ZnO is not more than 0.1 wt %.
Claim 22
Dependent Claim
17 words
A glass according to claim 14, wherein the content of MnO is not more than 350 ppm.
Claim 23
Dependent Claim
17 words
A glass according to claim 14, wherein the content of CoO is not more than 10 ppm.
Claim 24
Dependent Claim
71 words
A glass according to claim 14, wherein the glass at a thickness of 5 mm is not lower than 60% in visible light transmittance, not more than 50% in total sol. at radiation transmittance, not more than 25% in ultraviolet transmittance, from 5 to 11% in transmittance for infrared radiation at wavelength of 1100 nm, from 495 to 505 nm in dominant wavelength and from 5 to 9 in excitation purity.
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