# US 5,700,579 A · Glass compositions intended for the production of panes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,579 A - Document ID: US5700579A - Status: Granted - Kind: A - Application number: 08/308,266 - Filed: 1994-09-19 - Granted: 1997-12-23 - Earliest claimed: 1993-09-17 - Assignees: Saint-Gobain Vitrage - Inventors: Pierre Jeanvoine; Michel Lismonde; Jacques Vieslet - Web page: https://patentgrep.com/patent/US5700579A ## CPC - B32B 17/10036: {comprising two outer glass sheets} - C03C 3/087: containing calcium oxide, e.g. common sheet or container glass - C03C 4/082: {for infrared absorbing glass} - C03C 4/085: {for ultraviolet absorbing glass} - Y10S 501/904: Infrared transmitting or absorbing - Y10S 501/905: Ultraviolet transmitting or absorbing - Y10T 428/31612: As silicone, silane or siloxane - Y10T 428/3163: Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.] - Y10T 428/31645: Next to addition polymer from unsaturated monomers - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - 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 - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Glass compositions containing, expressed in percentages by weight, from 0.75 to 1.4% total iron expressed in the form Fe.sub.2 O.sub.3, from 0.25 to 0.32% ferrous iron in the form of FeO and which has, and at a thickness of between approximately 3 and 3.3 millimeters, exibit a total light transmission factor under illuminent A (TL.sub.A) of at least 70%, a total energy transmission factor (T.sub.E) less than approximately 46% and a transmission factor for ultraviolet radiation (T.sub.UV) less than approximately 25%, and are suitable for the production of windows or panes for use in the architectural field or in automobile and industrial vehicles. ## Claims ### Claim 1 A glass, comprising, in percentage by weight, based on the total weight of said glass: (a) 0.75 to 1.4% total iron, expressed in the form Fe.sub.2 O.sub.3 ; and (b) 0.25 to 0.32% ferrous iron, expressed in the form FeO; wherein said glass has a light transmission factor under illuminant A (TL.sub.A) of at least 70%, a total energy transmission factor (T.sub.E) less than 46%, and a transmission factor for ultraviolet radiation (T.sub.UV) less than 25%, when said glass has a thickness between 3 and 3.3 millimeters, wherein said glass comprises less than 0.1% of Ce oxide and less than 0.1% of Ti oxide. ### Claim 2 (depends on 1) The glass of claim 1, wherein said glass has a ratio percentage of the weight of ferrous iron in the form FeO, to the total iron expressed in the form Fe.sub.2 O.sub.3, of 22 to 34%. ### Claim 3 (depends on 2) The glass of claim 2, wherein said ratio percentage is from 25 to 30%. ### Claim 4 (depends on 1) The glass of claim 1, wherein said total iron, expressed in the form Fe.sub.2 O.sub.3, is from 0.85 to 1.3%. ### Claim 5 (depends on 1) The glass of claim 1, wherein said transmission factor for ultraviolet radiation (T.sub.UV) is less than 22%. ### Claim 6 (depends on 1) The glass of claim 1, consisting essentially of, in percentages by weight: (a) 0.75 to 1.4% total iron, expressed in the form Fe.sub.2 O.sub.3 ; (b) 0.25 to 0.32% ferrous iron, expressed in the form FeO; (c) 64 to 75% SiO.sub.2 ; (d) 0 to 5% Al.sub.2 O.sub.3 ; (e) 0 to 5% B.sub.2 O.sub.3 ; (f) 2 to 15% CaO; (g) 0 to 5% MgO; (h) 9 to 18% Na.sub.2 O; (i) 0 to 5% K.sub.2 O; (j) 0.10 to 0.35% SO.sub.3 ; and (k) less than 0.1% impurities. ### Claim 7 (depends on 1) The glass of claim 1, wherein said glass consists essentially of, in percent by weight; (a) 0.85 to 1.3% total iron, expressed in the form Fe.sub.2 O.sub.3 ; (b) 0.27 to 0.30% ferrous iron, expressed in the form FeO; (c) 68 to 73% SiO.sub.2 ; (d) 0.3 to 2 % Al.sub.2 O.sub.3 ; (e) 0 to 2% B.sub.2 O.sub.3 ; (f) 4 to 12% CaO; (g) 0 to 4.5% MgO; (h) 10 to 16% Na.sub.2 O; (i) 0 to 3% K.sub.2 O; (j) 0.15 to 0.3% SO.sub.3 ; and (k) less than 0.1% impurities. ### Claim 8 (depends on 7) The glass of claim 7, wherein said glass contains less than 0.05% of said impurities. ### Claim 9 (depends on 6) The glass of claim 6, wherein said glass has a weight ratio percentage of ferrous iron expressed in the form FeO, to total iron expressed in the form Fe.sub.2 O.sub.3, of 22-34%. ### Claim 10 (depends on 9) The glass of claim 9, wherein said ratio percentage is 25-30%. ### Claim 11 (depends on 6) The glass of claim 6, wherein said transmission factor for ultraviolet radiation (T.sub.UV) is less than 22%. ### Claim 12 A window, comprising: a first sheet of glass; an organic polymer on said first sheet of glass; and a second sheet of glass on said organic polymer; wherein said first sheet of glass comprises a glass composition comprising, in weight percent, (a) 0.75 to 1.4% total iron, expressed in the form Fe.sub.2 O.sub.3, and (b) 0.25 to 0.32% ferrous iron, expressed in the form FeO, and said glass composition, has a total light transmission factor under illuminant A (TL.sub.A) of at least 70%, a total energy transmission factor (T.sub.E) less than 46%, and a transmission factor for ultraviolet radiation (T.sub.UV) of less than 25%, when said glass composition has a thickness between 3 and 3.3 millimeters, wherein said first sheet of glass contains less than 0.1% of Ce oxide and less than 0.1% of Ti oxide. ### Claim 13 (depends on 12) The window of claim 12, wherein said first glass sheet consists essentially of, in percent by weight: (a) 0.75 to 1.4% total iron, expressed in the form Fe.sub.2 O.sub.3 ; (b) 0.25 to 0.32% ferrous iron, expressed in the form FeO; (c) 64 to 75% SiO.sub.2 ; (d) 0 to 5% Al.sub.2 O.sub.3 ; (e) 0 to 5% B.sub.2 O.sub.3 ; (f) 2 to 15% CaO; (g) 0 to 5% MgO; (h) 9 to 18% Na.sub.2 O; (i) 0 to 5% K.sub.2 O; (j) 0.10 to 0.35% SO.sub.3 ; and (k) less than 0.1% impurities. ### Claim 14 (depends on 1) The glass of claim 1, wherein said glass comprises 0.27 to 0.32% ferrous iron, by weight, expressed in the form FeO. ### Claim 15 (depends on 12) The window of claim 12, wherein said transmission factor for ultraviolet radiation (T.sub.UV) is less than 22%. ### Claim 16 (depends on 12) The window of claim 12, wherein said first sheet of glass comprises 0.27 to 0.32% ferrous iron, in weight percent, expressed in the form FeO.