# US 5,344,798 A · Blue-colored infrared and ultraviolet radiation absorbing glass and method of producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,344,798 A - Document ID: US5344798A - Status: Granted - Kind: A - Application number: 07/928,593 - Filed: 1992-08-13 - Granted: 1994-09-06 - Earliest claimed: 1991-08-14 - Assignees: Central Glass Company, Limited - Inventors: Shigeki Morimoto; Tadashi Noguchi; Masakazu Taniguchi; Yasushi Taguchi - Web page: https://patentgrep.com/patent/US5344798A ## CPC - C03C 4/085: {for ultraviolet absorbing glass} - C03C 1/10: to produce uniformly-coloured transparent products - C03C 3/095: containing rare earths - C03C 4/02: for coloured glass - C03C 4/082: {for infrared absorbing glass} - C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS ## 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.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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) A glass according to claim 1, wherein the amount of said total iron expressed as Fe.sub.2 O.sub.3 is in the range from 0.40 to 0.80 wt %. ### Claim 3 (depends on 1) A glass according to claim 1, wherein the content of ZnO is not more than 0.1 wt % ### Claim 4 (depends on 1) A glass according to claim 1, wherein the content of MnO is not more than 350 ppm. ### Claim 5 (depends on 1) A glass according to claim 1, wherein the content of CoO is not more than 10 ppm. ### Claim 6 (depends on 1) 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 7 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. ### Claim 8 (depends on 7) A glass according to claim 7, wherein the amount of said total iron expressed as Fe.sub.2 O.sub.3 is in the range from 0.40 to 0.80 wt %. ### Claim 9 (depends on 8) 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 10 (depends on 7) A glass according to claim 7, wherein the content of CeO.sub.2 is from 0.40 to 0.70 wt %. ### Claim 11 (depends on 7) A glass according to claim 7, wherein the content of ZnO is not more than 0.1 wt %. ### Claim 12 (depends on 7) A glass according to claim 7, wherein the content of MnO is not more than 350 ppm. ### Claim 13 (depends on 7) A glass according to claim 7, wherein the content of CoO is not more than 10 ppm. ### Claim 14 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. ### Claim 15 (depends on 14) A glass according to claim 14, wherein the amount of said total iron expressed as Fe.sub.2 O.sub.3 is in the range from 0.45 to 0.75 wt %. ### Claim 16 (depends on 15) 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 17 (depends on 14) A glass according to claim 14, wherein the content of CeO.sub.2 is not less than 0.45 wt %. ### Claim 18 (depends on 14) A glass according to claim 14, wherein the content of ZnO is not more than 0.1 wt %. ### Claim 19 (depends on 14) A glass according to claim 14, wherein the content of MnO is not more than 350 ppm. ### Claim 20 (depends on 14) A glass according to claim 14, wherein the content of CoO is not more than 10 ppm. ### Claim 21 (depends on 14) 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.