TH54065A - Colored soda-lime glass Have high light transmission - Google Patents

Abstract

DC60 (31/05/44) This invention relates to colored soda-lime glass with high light transmission. The colored soda-lime glass is composed of less than 0.4% by weight of the total amount of iron, expressed as Fe2O3, with a recox ratio of at least 30%, with a minimum amount of FeO of 0.08% by weight, and contains a total of at least 5 ppm and a maximum of 1500 ppm by weight of at least one of the following color agents in the indicated amounts: Cr2O3, from 0-500 ppm, V2O5 from 0 to 1000 ppm, Co from 0 to 100 ppm, and Se from 0 to 10 ppm. This glass is suitable as glazing for vehicles and as architectural glazing. This invention relates to colored soda-lime glass with high light transmission. Containing less than 0.4% by weight of the total iron content, expressed as Fe2O3, with a recoil ratio of at least 30%, and a minimum of 0.08% by weight of FeO, and containing a total of at least 5 ppm and a maximum of 1500 ppm by weight of the total weight of the glass, with at least one of the following color agents in the following quantities: Cr2O3 from 0-500 ppm, V2O5 from 0 to ppm, Co from 0 to 100 ppm, and Se from 0 to ppm. This glass is suitable for vehicle glazing and as building glazing.

Claims (22)

1. Soda-lime glass is colored, has high light transmittance, and consists of glass-forming components and coloring agents. The amounts of these agents, expressed by weight relative to the total weight of the glass, indicate that the glass contains a total amount of iron, expressed as Fe2O3 oxide, which is less than 0.4% by weight, and that the glass has a recoil ratio of at least 30%, with a minimum FeO content of 0.08% by weight. It also contains at least five parts per million (ppm) and a maximum of 1500 ppm by weight of at least one of the following coloring agents in the following quantities: Cr2O3 from 0 to 500 ppm, V2O5 from 0 to 1000 ppm, Co from 0 to 100 ppm, and Se from 0 to 10 ppm. 2. Colored glass as per claim 1, characterized by a light transmission (TLA4) of 66% or higher. 3. Colored glass according to claim number 2, characterized by a light transmission (TLA4) of 70% or higher. 4. Colored glass according to claim number 3, characterized by a light transmission (TLA4) of greater than or equal to 72%, and a preference of greater than or equal to 75%. 5. Colored glass according to any one of the claims 1 through 4, characterized by a prominent color trace (lambda D) less than 494 nanometers in transmission. 6. Colored glass as per claim 5, characterized by the presence of a dominant wavelength (lambda D) of less than 492 nanometers in the transmitted color trace. 7. Colored glass according to claim number 6, characterized by the presence of a dominant wavelength (lambda D) of less than 492 nanometers in the transmitted color trace. 8. Colored glass according to any one of the claims 1 through 7, characterized by a color trace of the colored glass in transmission having an excitation purity (P) greater than 3%, preferably greater than 5%. 9. Any colored glass as described in claims 1 through 8, having the characteristic that the colored glass has a transmittance (SE) greater than or equal to 1.2. 10. Blue soda-lime glass has high light transmittance. It is composed primarily of glass and contains coloring agents. The glass is characterized by a total iron content, expressed as Fe2O3 oxide, which is less than 0.4% by weight. The transmittance exhibits a dominant wavelength (lambda D) below 494 nm, a transmissibility (TLA4) greater than 66%, an excitation purity (P) greater than 3%, and a luminous transmittance (SE) greater than 1.2. 11. Colored glass according to claim number 10, characterized by a light transmission (TLA4) of 70% or higher. 12. Colored glass as per claim 10 or 11, having the characteristic that the colored glass has a redox ratio of at least 30%. 13. Colored glass according to any one of the claims 10 through 12, being characterized as containing at least one of the following color agents in the quantities indicated, expressed by weight relative to the total weight of the glass: Cr2O3 from 0 to 500 ppm, V2O5 from 0 to 1000 ppm, Co from 0 to 100 ppm, Se from 0 to 10 ppm. 14. Colored glass according to any one of the claims 1 through 13, having the characteristic that the colored glass contains less than 0.3% by weight of TiO2 relative to the total weight of the glass. 15. Colored glass according to claim 14, characterized by the inclusion of less than 0.1% by weight of TiO2 relative to the total weight of the glass. 16. Colored glass according to any one of the claims 1 through 15, having the characteristic that the colored glass contains less than 0.3% by weight of CeO2 relative to the total weight of the glass. 17. Colored glass according to claim 16, characterized by the presence of less than 0.1% by weight of CeO2 of the total weight of the glass. 18. Colored glass according to any one of the claims 1 through 17, having the characteristic that the colored glass contains a maximum of 50 ppm by weight of CO2 relative to the total weight of the glass. 19. Colored glass according to any one of the claims 1 through 18, having the characteristic that the colored glass contains more than 2% by weight of MgO. 20. Colored glass according to any one of the claims 1 through 19, characterized by the glass being composed of the following amounts of coloring agents, expressed by weight relative to the total weight of the glass; total amount of iron expressed as Fe2O3: Fe2O3 from 0.27% to less than 0.4%; FeO from 0.10% to 0.20%; Co from 1 ppm to 35 ppm; Cr2O3 from 0 to 250 ppm; V2O5 from 0 to 450 ppm; and having the following expressive properties: 70.5% < TLA4 < 85%; 40% < TE4 < 60%; P > 3%; lambda D less than or equal to 492 nm. 21. Colored glass according to any one of the claims 1 through 20, which is of the nature that colored glass produces glass for motor vehicles. 22. Colored glass as specified in any of the claims 1 through 20, which has the characteristic of creating glass for buildings.