EP0565882A1
Expired / Lapsed
EP
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Neutral gray-colored infrared and ultraviolet radiation absorbing glass
Assignee: Central Glass Co Ltd
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Filing: 1993-03-16
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Granted: —
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Expires: 2013-03-16
Abstract
Abstract An infrared and ultraviolet radiation absorbing glass suitable for use in building and vehicle windows, which comprises, on a weight basis, 68-74% of SiO₂, 0.1-3.0% of Al₂O₃, 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na₂O, 0.5-3.0% of K₂O, 0.1-0.4% of SO₃, 0.10-0.55% of total iron expressed as Fe₂O₃, 0.2-0.6% of CeO₂, 15-35 ppm of CoO and 2-18 ppm of Se. In the glass the ratio of ferrous iron to ferric iron is in the range from 0.17 to 0.55. The glass has a neutral grayish tint and is well balanced in visible light transmittance, infrared radiation absorption and ultraviolet radiation absorption, and a sheet of the glass can be easily tempered by a conventional method.
Inventors
- 👤 Shigeki Morimoto
- 👤 Tadashi Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 08:20
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/08; C03C4/085; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C4/02; C03C4/082; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904; Y10S501/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
A neutral gray-colored infrared and ultraviolet radiation absorbing glass comprising as coloring components, on a weight basis, 0.10-0.55% of total iron expressed as Fe₂O₃, 0.2-0.6% of CeO₂, 15-35 ppm of CoO and 2-18 ppm of Se.
Claim 2
Dependent Claim
38 words
A glass according to Claim 1, wherein said total iron includes ferrous iron and ferric iron and that the weight ratio of said ferrous iron to said ferric iron, Fe²⁺/Fe³⁺, is in the range from 0.17 to 0.55.
Claim 3
Dependent Claim
23 words
A glass according to Claim 1, wherein said glass further comprises as a coloring component, on a weight basis, 0.15-0.45 % of TiO₂.
Claim 4
Dependent Claim
72 words
A glass according to Claim 1, wherein said glass further comprises as fundamental components, on a weight basis, 68-74% of SiO₂, 0.1-3.0% of Al₂O₃, 8-11% of CaO, 2-4.5% of MgO, 11.5-16% of Na₂O, 0.5-3.0% of K₂O, 0.1-0.4% of SO₃, with provisos that the total of SiO₂ and Al₂O₃ is from 68-74%, that the total of CaO and MgO is from 11-15% and that the total of Na₂O and K₂O is from 12-17%.
Claim 5
Dependent Claim
67 words
A glass according to Claim 3, wherein said glass comprises as coloring components, on a weight basis, 0.33-0.45% of said total iron expressed as Fe₂O₃, 0.3-0.6% of said CeO₂, 0.2-0.4% of said TiO₂, 15-30 ppm of said CoO and 3-10 ppm of said Se, with provisos that the weight ratio of said ferrous iron to said ferric iron, Fe²⁺/Fe³⁺, is in the range from 0.20 to 0.30.
Claim 6
Dependent Claim
67 words
A glass according to Claim 3, wherein said glass comprises as coloring components, on a weight basis, 0.25-0.45% of said total iron expressed as Fe₂O₃, 0.3-0.6% of said CeO₂, 0.2-0.4% of said TiO₂, 15-30 ppm of said CoO and 6-15 ppm of said Se, with provisos that the weight ratio of said ferrous iron to said ferric iron, Fe²⁺/Fe³⁺, is in the range from 0.30 to 0.40.
Claim 7
Dependent Claim
65 words
A glass according to Claim 3, wherein said glass comprises as coloring components, on a weight basis, 0.18-0.35% of said total iron expressed as Fe₂O₃, 0.3-0.6% of said CeO₂, 0.2-0.4% of said TiO₂, 15-30 ppm of said CoO and 6-12 ppm of said Se, with provisos that the weight ratio of said ferrous iron to said ferric iron, Fe²⁺/Fe³⁺, is in the range from 0.40-0.50.
Claim 8
Dependent Claim
48 words
A glass according to Claim 1, wherein said glass at a thickness of 4 mm is not lower than 70% in visible light transmittance with using the standard illuminant A, from 50 to 74% in total solar radiation transmittance and from 15 to 29% in ultraviolet radiation transmittance.
Claim 9
Dependent Claim
33 words
A glass according to Claim 8, wherein said total solar radiation transmittance is in the range from 50 to 71%, and said ultraviolet radiation transmittance is in the range from 15 to 27%.
Claim 10
Dependent Claim
32 words
A glass according to Claim 1, wherein said glass at a thickness of 4 mm is from 556 to 582 nm in dominant wavelength and from 0.5 to 7.0 in excitation purity.
Claim 11
Dependent Claim
24 words
A glass according to Claim 10, wherein said glass at a thickness of 4 mm is from 560 to 580 nm in dominant wavelength.
Claim 12
Dependent Claim
25 words
A glass according to Claim 2, wherein the amount of said total iron expressed as Fe₂O₃ is in the range from 0.15 to 0.47 wt%.
Claim 13
Dependent Claim
77 words
A glass according to Claim 1, wherein the amount of said total iron expressed as Fe₂O₃ is in the range from 0.10 to 0.50, and the amount of said Se is in the range from 3 to 15 ppm on a weight basis, with provisos that said total iron includes ferrous iron and ferric iron and that the weight ratio of said ferrous iron to said ferric iron, Fe²⁺/Fe³⁺, is in the range from 0.17 to 0.50.
Claim 14
Dependent Claim
38 words
A brown-colored infrared and ultraviolet radiation absorbing glass comprising as coloring components, on a weight basis, 0.15-0.55% of total iron expressed as Fe₂O₃, 0.2-0.6% of CeO₂, 0.15-0.45% of TiO₂, 15-35 ppm of CoO and 2-18 ppm of Se.
References Cited (Backward Citations)
US3296004A
Cited
US3723142A
Cited
GB1331492A
Cited
EP0349909A1
Cited
US5023210A
Cited
GB2252973A
Cited
FR2672587A1
Cited
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