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AssigneeCentral Glass Company, Limited
InventorsShigeki Morimoto, Tadashi Noguchi, Masakazu Taniguchi, Yasushi Taguchi
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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.sub.2, 0.1-3.0% Al.sub.2 O.sub.3, 7.0-11.0% CaO, 2.0-4.2% MgO, 12.0-16.0% Na.sub.2 O, 0.5-3.0% K.sub.2 O, 0.02-0.30% SO.sub.3, 0.30-0.90% total iron expressed as Fe.sub.2 O.sub.3, 0.10-0.80% CeO.sub.2, 0-1.0% TiO.sub.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.
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-73.0% of SiO.sub.2, 0.1-3.0% of Al.sub.2 O.sub.3, 7.0-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na.sub.2 O, 0.5-3.0% of K.sub.2 O, 0.05-0.18% of SO.sub.3, 0.30-0.90% of total iron expressed as Fe.sub.2 O.sub.3, 0.10-0.80% of CeO.sub.2, 0-1.0% of TiO.sub.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.sub.2 and Al.sub.2 O.sub.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.sub.2 O and K.sub.2 O is from 13.0 to 17.0%, that the total of TiO.sub.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.sup.2+ /Fe.sup.3+, is in the range from 0.80 to 2.50.
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-72.0% of SiO.sub.2, 1.6-3.0% of Al.sub.2 O.sub.3, 8.5-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na.sub.2 O, 0.5-3.0% of K.sub.2 O, 0.05-0.18% of SO.sub.3, 0.30-0.90% of total iron expressed as Fe.sub.2 O.sub.3, 0.10-0.80% of CeO.sub.2, 0-1.0% of TiO.sub.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.sub.2 and Al.sub.2 O.sub.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.sub.2 O and K.sub.2 O is from 13.0 to 17.0%, that the total of TiO.sub.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.sup.2+ /Fe.sup.3+, is in the range from 0.80 to 2.50.
A blue-colored infrared and ultraviolet radiation absorbing glass comprising as essential components, on a weight basis, 68.0-73.0% of SiO.sub.2, 0.1-2.5% of Al.sub.2 O.sub.3, 7.0-11.0% of CaO, 2.0-4.2% of MgO, 12.0-16.0% of Na.sub.2 O, 0.5-3.0% of K.sub.2 O, 0.03-0.25% of SO.sub.3, 0.40-0.80% of total iron expressed as Fe.sub.2 O.sub.3, 0.10-0.70% of CeO.sub.2, 0-1.0% of TiO.sub.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.sub.2 and Al.sub.2 O.sub.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.sub.2 O and K.sub.2 O is from 13.0 to 17.0%, that the total of TiO.sub.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.sup.2+ /Fe.sup.3+, is in the range from 1.00 to 2.00.
Dependencies are inferred from the claim text.