EP0555552A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Green-colored infrared and ultraviolet radiation absorbing glass and method of producing same
Assignee: Central Glass Co Ltd
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Filing: 1992-12-22
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Granted: —
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Expires: 2012-12-22
Abstract
Abstract An infrared and ultraviolet radiation absorbing glass suitable for use in building and vehicle windows, which comprises, on a weight basis, 68-72% of SiO₂, 1.6-3.0% of Al₂O₃, 8.5-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na₂O, 0.5-3.0% of K₂O, 0.03-0.30% of SO₃, 0.58-0.80% of total iron expressed as Fe₂O₃, 0.1-0.7% of CeO₂, 0.1-0.4% of TiO₂ and 5-350 ppm of MnO. In the glass the ratio of ferrous iron to ferric iron is in the range from 0.50 to 0.70. The glass has a greenish 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
- 👤 Masakazu Taniguchi
- 👤 Yasushi Taguchi
- 👤 Naoki Sunamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 04:10
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/02; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C4/08; C03C4/082; C03C4/085; C03C8/00; C03C8/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
A green-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68-72% of SiO₂, 1.6-3.0% of Al₂O₃, 8.5-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na₂O, 0.5-3.0% of K₂O, 0.03-0.30% of SO₃, 0.58-0.80% of total iron expressed as Fe₂O₃, 0.1-0.7% of CeO₂, 0.1-0.4% of TiO₂ and 5-350 ppm of MnO with provisos that the total of the above defined essential components amounts to at least 98 wt% of the glass, that the total of SiO₂, Al₂O₃ and TiO₂ is from 70-74%, that the total of CaO and MgO is from 12-15%, that the total of Na₂O and K₂O is from 13-17%, 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 0.50 to 0.70.
Claim 2
Dependent Claim
25 words
A glass according to Claim 1, wherein the amount of said total iron expressed as Fe₂O₃ is in the range from 0.60 to 0.75 wt%.
Claim 3
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 0.62 to 0.73 wt%.
Claim 4
Dependent Claim
20 words
A glass according to Claim 1, wherein the amount of SO₃ is in the range from 0.05 to 0.30 wt%.
Claim 5
Dependent Claim
20 words
A glass according to Claim 4, wherein the amount of SO₃ is in the range from 0.10 to 0.15 wt%.
Claim 6
Dependent Claim
27 words
A glass according to Claim 1, wherein the weight ratio of said ferrous iron to said ferric iron, Fe²⁺/Fe³⁺, is in the range from 0.53 to 0.68.
Claim 7
Dependent Claim
20 words
A glass according to Claim 1, wherein the amount of CeO₂ is in the range from 0.20 to 0.65 wt%.
Claim 8
Dependent Claim
20 words
A glass according to Claim 1, wherein the amount of TiO₂ is in the range from 0.10 to 0.35 wt%.
Claim 9
Dependent Claim
22 words
A glass according to Claim 1, wherein the amount of MnO is in the range from 100 to 300 ppm by weight.
Claim 10
Dependent Claim
139 words
A method of producing an infrared and ultraviolet radiation absorbing glass according to Claim 1, characterized in that a part of a batch of glass composition to be melted is cullet of a frit glass which consists essentially of, on a weight basis, 45-65% of SiO₂, 3.5-10.0% of Al₂O₃, 13-30% of CaO, 4.0-5.5% of MgO, 6.5-12.0% total of Na₂O and K₂O, 0.04-0.15% of SO₃, 0.05-0.50% of S²⁻, 0.40-0.65% of total iron expressed as Fe₂O₃, 0.05-0.45% of MnO, 0.25-0.65% of TiO₂, 0.10-0.55% of CeO₂ with provisos that the total of the above defined essential components amounts to at least 95 wt% of the frit glass and that the total iron includes ferrous iron and ferric iron and that the weight ratio of the ferrous iron expressed as FeO to the total iron expressed as Fe₂O₃ is not less than 0.5.
Claim 11
Dependent Claim
28 words
A method according to Claim 10, wherein the amount of said cullet of said frit glass is from 1 to 35 wt% of said batch of glass composition.
Claim 12
Dependent Claim
28 words
A method according to Claim 11, wherein the amount of said cullet of said frit glass is from 5 to 30 wt% of said batch of glass composition.
Claim 13
Dependent Claim
28 words
A method according to Claim 12, wherein the amount of said cullet of said frit glass is from 8 to 25 wt% of said batch of glass composition.
Claim 14
Dependent Claim
41 words
A method according to Claim 13, wherein said batch of glass composition is melted in the presence of sodium sulfate, the amount of said sodium sulfate being not more than 0.5 wt% of total silica in said batch of glass composition.
References Cited (Backward Citations)
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