Solar Control Thin Green Glass Composition

Abstract

The present invention refers to a glass composition and a method for the commercial production of a solar control thin green glass mainly for use in the automotive industry such as symmetric-hybrid windshields or asymmetric-hybrid windshields, sidelights and rear windows, which includes a basic composition of soda-lime-silica glass, and consists essentially, in weight percentage: from 1.30 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO. The solar control thin green glass having an illuminant A light transmission (T.sub.LA) greater than 70%, a direct solar transmittance (T.sub.DS) of less than 51%, a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%; a dominant wavelength () from 490 nm to 600; and excitation purity less than 7, for thickness from about 0.7 to 3.0 mm.

Claims

1. A glass composition for a thin green solar control glass, comprising: a soda-lime-silica base glass and a colorant, wherein said colorant comprises: 1.5 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO, the glass having an illuminant A light transmission (T.sub.LA) greater of 70%, a direct solar transmittance (T.sub.DS) of less than 51%, and a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%, wherein the glass has a thickness from about 0.7 to 3.0 mm, and wherein the glass has an excitation purity of less than 7 for thickness of from about 0.7 to 2.0 mm.

2. The solar control glass as defined in claim 1, wherein the dominant wavelength is from 490 nm to 600 nm.

3. (canceled)

4. The solar control glass as defined in claim 1, wherein the soda-lime-silica base glass composition comprises of 68 to 75% of SiO.sub.2, 0 to 5% of Al.sub.2O.sub.3, 5 to 15% of CaO, 0 to 10% of MgO, 10 to 18% of Na.sub.2O, and 0 to 5% of K.sub.2O.

5. A glass sheet formed from a glass composition as claimed in claim 1 comprising: a soda-lime-silica base glass and a colorant, wherein said colorant comprises: 1.5 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO, the glass having an illuminant A light transmission (T.sub.LA) greater of 70%, a direct solar transmittance (T.sub.DS) of less than 51%, and a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%, wherein the glass has a thickness from about 0.7 to 2.0 mm.

6. The glass sheet as defined in claim 5, wherein the dominant wavelength is from 490 nm to 600 nm.

7. (canceled)

8. The glass sheet as defined in claim 1, which is formed by a float process.

9. A symmetric-hybrid or asymmetric-hybrid laminated glass having an inner ply, an outer ply and a polymer interlayer provided between the inner ply and outer ply, the inner ply and the outer ply and the polymer interlayer being laminated together, wherein the at least one ply includes at least one glass sheet comprising a glass composition comprising, a soda-lime-silicate base glass and a colorant, wherein said colorant comprises: 1.30 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO, the glass composition having an illuminant A light transmission (T.sub.LA) greater of 70%, a direct solar transmittance (T.sub.DS) of less than 51%, and a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%, wherein the glass has a thickness from about 0.7 to 3.0 mm.

10. The laminated glass as is defined in claim 9, having an illuminant A light transmission (T.sub.LA) greater than 70%, a direct solar transmittance (T.sub.DS) of less than 50%, a total UV light transmittance (T.sub.UV) of less than 5% and a total solar transmittance (T.sub.TS) of less than 60% for at least a total thickness of the laminated glass from about 2.3 to 5.0 mm.

11. The laminated glass of claim 9, wherein the inner ply has a thickness ranging from about 0.5 mm to 2.0, and the outer ply has a thickness ranging from about 1.0 mm to about 2.6 mm.

12. The laminated glass of claim 9, wherein the inner ply comprises a glass from of an ion exchanged and not ion exchanged alkali aluminosilicate glass (Gorilla Glass).

13. The laminated glass of claim 9, wherein the inner ply comprises a glass from of an ion exchanged and not ion exchanged borosilicate glass.

14. The laminated glass structure of claim 9, wherein the inner ply comprises a glass from of an ion exchanged and not ion exchanged soda lime silicate glass.

15. The laminated glass of claim 9, comprising: an inner ply of a commercial clear glass, a polymer interlayer over the inner ply; and, an outer ply comprising a glass composition comprising, a soda-lime-silicate base glass and a colorant, wherein said colorant comprises: 1.30 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO, the glass composition having an illuminant A light transmission (T.sub.LA) greater of 70%, a direct solar transmittance (T.sub.DS) of less than 51%, and a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%, wherein the laminated glass has a thickness from about 2.3 to 5.0 mm.

16. The laminated glass of claim 15, wherein the outer ply has a thickness from about mm to 3.0 mm.

17. The laminated glass of claim 15, wherein the inner ply has thickness ranging from about 0.7 mm to 1.0 mm.

18. The laminated glass of claim 9, comprising: an inner ply of a commercial clear glass, a first polymer interlayer over inner ply; a center ply of a commercial clear glass; a second polymer interlayer over the center ply; and an outer ply comprising a glass composition comprising, a soda-lime-silicate base glass and a colorant, wherein said colorant comprises: 1.30 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO, the glass composition having an illuminant A light transmission (T.sub.LA) greater of 70%, a direct solar transmittance (T.sub.DS) of less than 51%, and a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%, wherein the laminated glass has a thickness from about 3.5 to 5.0 mm.

19. The laminated glass of claim 18, wherein the inner ply and the center ply have a thickness ranging from about 0.5 mm to 1.1 mm; and the outer ply has a thickness from about 0.7 to 1.5 mm.

20. The laminated glass of claim 9, comprising: an inner ply of Gorilla Glass, a first polymer interlayer over the inner ply; a center ply of Gorilla Glass; a second polymer interlayer over the center ply; and, an outer ply comprising a glass composition comprising, a soda-lime-silicate base glass and a colorant, wherein said colorant comprises: 1.30 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO, the glass composition having an illuminant A light transmission (T.sub.LA) greater of 70%, a direct solar transmittance (T.sub.DS) of less than 51%, and a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%, wherein the laminated glass has a thickness from about 3.5 to 5.0 mm.

21. The laminated glass of claim 20, wherein the inner ply and center ply have a thickness ranging from about 0.5 mm to 1.1 mm; and the outer ply has a thickness from about 0.7 to 1.5 mm.

22. The laminated glass of claim 9, wherein the outer ply can be an ion exchanged and not ion exchanged commercial clear glass, an ion exchanged and not ion exchanged borosilicate glass or an ion exchanged and not ion exchanged alkali aluminosilicate glass (Corning Gorilla Glass) and the inner ply is manufactured of the green glass composition.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0072] FIG. 1 shows the schematic diagram of a laminated glazing configuration.

[0073] FIG. 2 shows another schematic diagram of a triple laminated glazing configuration.

[0074] FIG. 3 is a graph showing the behavior of iron oxide if the thickness is reduced, for example to maintain the T.sub.LA greater than 70% with a thickness of 0.5 mm, a value close to 2% Fe.sub.2O.sub.3 is required considering that the ferrous is about 26.5%.

[0075] FIG. 4 is a graph showing the behavior of iron oxide if the thickness is reduced, for example to maintain the T.sub.DS less than 51%, with a thickness of 0.5 mm, a value close to 2% Fe.sub.2O.sub.3 is required considering that the ferrous is about 26.5%.

DETAILED DESCRIPTION OF THE INVENTION

[0076] The typical composition of soda-lime-silica glass formed by the float glass process for the automotive industry is characterized by the following formulation based on the percentage by weight with respect to the total weight of the glass, these percentages were obtained by using x-ray fluorescence analysis.

TABLE-US-00001 By weight (%): SiO.sub.2 68 to 75 Al.sub.2O.sub.3 0 to 5 CaO 5 to15 MgO 0 to 10 Na.sub.2O 10 to 18 K.sub.2O 0 to 5

[0077] The green glass composition of the present invention is based on the composition described above to which the following coloring compounds have been added: 1.30 to 2.50% of total iron expressed as Fe.sub.2O.sub.3; from 15 to 40% of Fe.sup.2+ (Ferrous) and from 0.15 to 0.65% of FeO, expressed as Fe.sub.2O.sub.3; from about 0.05 to about 0.30% of SO.sub.3; from about 0.02 to about 1.0% of TiO.sub.2; from about 0.0002 to about 0.03% of Cr.sub.2O.sub.3; and from about 0.0002 to about 0.015% of CuO.

[0078] The green glass having an illuminant A light transmission (T.sub.LA) greater than 70%, a direct solar transmittance (T.sub.DS) of less than 51%, and a total UV light transmittance (T.sub.UV) of less than 40% and a total solar transmittance (T.sub.TS) of less than 63%, wherein the glass has a thickness from about 0.7 to 3.0 mm.

[0079] In recent years the trend in the automotive industry has been to reduce the thickness of glass without sacrificing the thermal performance of the products, so, for example, we can find in the automotive market tempered solar control products with light transmission greater than the 70% required by the Federal Standard ANSI Z 26.1 in thicknesses ranging from 4.85 to 3.2 mm, which means that the composition is adjusted for each thickness to achieve a targeted thermal performance or equivalent solar control.

[0080] As it is known, solar control glass is a term that applies to glass that allows the visible light coming from the sun to pass through glazing systems (windows and windshields) and at the same time, absorbs or reflects much of the sun's heat to the exterior. In the case of glazing systems for driver's vision, such as front doors and the automobile windshield, the transmission of visible light must comply with the Federal standard of greater than 70%. On the other hand, minimum values of solar and ultraviolet transmission are sought, such that this glass composition keeps the interior of the vehicle or houses more comfortable than it would be if conventional glass was used. Therefore, lower energy consumption is required in air conditioning systems, which results in less pollution and cost reduction.

[0081] To achieve the described characteristics, the present invention defines the correct mixture of iron oxide (Fe.sub.2O.sub.3)Redox (Ferrous) to give greenish coloration and reduce ultraviolet (T.sub.UV) and solar (T.sub.S) transmission, titanium oxide (TiO.sub.2) to contribute to the blocking of ultraviolet radiation and copper oxide (CuO) as coloring agents in order to adjust the yellowish tint that may be conferred by the addition of titanium oxide. However, high concentrations of CuO negatively impact visible transmission.

[0082] The calculation of the ultraviolet radiation transmission (T.sub.UV), involves only the participation of the solar UV radiation, so that it is evaluated in the range 300 to 400 nm of wavelength using intervals of 5 nm and air mass equals 1.5 ISO 13837 convention A standard.

[0083] The physical properties such as light transmission correspond to calculated variables based on internationally accepted standards. So that, the light transmission is evaluated using the illuminant A (T.sub.LA) and standard observer of 2 degree also known as 1931 [C.I.E. Publication, 15.2, ASTM E-308 (1990)]. The wavelength range used for this purpose is from 380 to 780 nm, integrating values in numeric form with intervals of 10 nm.

[0084] In the infrared transmission (TR) calculation the range is comprised of the radiation in the solar spectrum, having a range of 800 to 2500 nm, with intervals of 50 nm, using the values of ISO/DIS 13837.

[0085] The direct solar transmittance (T.sub.DS) represents the heat which the glass transmits in direct form, evaluating it from 300 nm to 2500 nm with intervals of 5, 10, and 50 nm, the numeric form of calculation uses as recognized standard values by ISO 13837 standard (air mass 1.5 300 to 2500 nm trapezoidal intervals).

[0086] The total solar energy transmission (T.sub.TS) was evaluated in the range of 300 to 2500 nm considering wind speed of 4 m/s (parked), in accordance with ISO/DIS 13837.

[0087] The specifications for the determination of color such as the dominant wavelength and the purity of excitement have been derived from the tristimulus values (X, Y, Z), which have been adopted by the International Commission of Illumination (C.I.E.), as direct result of experiments involving many observers. These specifications could be determined by the calculation of the three-chromatic coefficients X, Y, Z of the tristimulus values that corresponding to the red, green and the blue colors, respectively. The three-chromatic values were plotted in the chromaticity diagram and compared with the coordinates of the illuminant D65 considered as illumination standard. The comparison provides the information in order to determine the color purity excitement and it is dominant wavelength. The dominant wavelength defines the wavelength of the color and it is value located in the visible range, of the 380 to 780 nm, while for the purity of excitement, the less the value is, the nearest tends to be a neutral color. A deeper understanding of the topics can be obtained from the Handbook of Colorimetry published by the Massachusetts Institute of Technology, of Arthur C. Hardy, Issued in 1936.

[0088] The color variables L*, a* and b* of the color system CIELAB 1976, are also calculated through the tristimulus values.

[0089] The following are examples of soda-lime-silica compositions for monolithic and laminated sheets in accordance with the present invention having corresponding physical properties of visible light (T.sub.LA), UV light (T.sub.UV), infrared (T.sub.IR), direct solar (T.sub.DS) and total solar transmittance (T.sub.TS).

[0090] The composition of the following glasses was calculated by x-ray fluorescence.

[0091] Table 1, examples 1 to 27, describe solar control thin green glass compositions at actual thickness of about 1.2 to about 4 mm, which maintain solar performance such as thinner glass and can be used to reduce weight in vehicles.

TABLE-US-00002 TABLE 1 Ex1 Ex2 Ex3 Ex4 Ex5 Ex6 Ex7 Ex8 Colorants percent by weight SiO.sub.2 69.4 69.4 70.7 70.1 69.9 70.4 69.7 69.7 Na.sub.2O 13.2 13.2 13.2 13.2 13.0 13.2 13.3 13.3 K.sub.2O 0.4 0.4 0.3 0.3 0.4 0.4 0.4 0.4 CaO 9.4 9.4 8.5 9.1 9.3 8.9 9.3 9.3 MgO 4.7 4.7 4.3 4.6 4.7 4.5 4.7 4.7 Al.sub.2O.sub.3 0.77 0.77 0.79 0.78 0.79 0.81 0.79 0.79 SO.sub.3 0.26 0.26 0.22 0.23 0.22 0.22 0.25 0.25 Fe.sub.2O.sub.3 1.77 1.77 1.75 1.64 1.60 1.46 1.47 1.47 Ferrous 30.0 30.0 27.7 28.5 27.7 28.3 27.4 27.4 FeO 0.532 0.532 0.485 0.466 0.444 0.413 0.404 0.404 TiO.sub.2 0.057 0.057 0.059 0.057 0.057 0.059 0.059 0.059 Cr.sub.2O.sub.3 0.0007 0.0007 0.0007 0.0007 0.0009 0.0009 0.0007 0.0007 Solar Properties Thickness (mm) 1.2 1.3 1.4 1.5 1.6 1.8 1.8 1.9 T.sub.UV 32.0 30.1 29.7 30.8 30.5 31.1 31.1 29.9 T.sub.LA 72.6 71.3 71.5 71.7 71.4 71.4 71.8 70.8 T.sub.DS 51.2 49.1 49.4 49.1 48.6 47.9 48.4 47.0 T.sub.IR 35.7 33.1 33.5 32.5 31.9 30.4 31.1 29.3 T.sub.TS 63.0 61.5 61.7 61.5 61.1 60.6 61.0 59.9 L* 88.8 88.2 88.2 88.3 88.2 88.3 88.4 88.0 a* 5.6 6.0 6.0 6.1 6.3 6.6 6.5 6.9 b* 3.0 3.2 3.5 3.1 3.0 2.7 2.7 2.9 % Pe 2.2 2.4 2.6 2.3 2.2 2.1 2.1 2.2 Dw (nm) 529.0 529.1 532.7 526.3 523.8 516.1 517.2 517.1 Ex9 Ex10 Ex11 Ex12 Ex13 Ex14 Ex15 Ex16 Colorants percent by weight SiO.sub.2 69.8 70.9 70.6 72.4 70.6 70.3 71.3 71.1 Na.sub.2O 13.2 13.6 14.6 13.3 13.7 13.5 13.1 14.0 K.sub.2O 0.4 0.4 0.3 0.4 0.3 0.4 0.3 0.3 CaO 9.3 8.5 7.7 7.2 8.7 8.9 8.2 8.0 MgO 4.8 4.3 4.2 4.0 4.4 4.5 4.5 4.2 Al.sub.2O.sub.3 0.79 0.69 0.64 0.70 0.67 0.81 0.69 0.64 SO.sub.3 0.24 0.19 0.30 0.24 0.19 0.22 0.25 0.27 Fe.sub.2O.sub.3 1.30 1.32 1.55 1.74 1.20 1.27 1.62 1.38 Ferrous 28.2 29.3 23.7 19.9 31.4 28.0 20.0 24.3 FeO 0.366 0.385 0.367 0.345 0.378 0.357 0.325 0.335 TiO.sub.2 0.059 0.194 0.044 0.049 0.189 0.058 0.048 0.044 Cr.sub.2O.sub.3 0.0008 0.0004 0.0005 0.0005 0.0005 0.0008 0.0005 0.0005 Solar Properties Thickness (mm) 2.1 2.1 2.1 2.1 2.2 2.3 2.3 2.4 T.sub.UV 31.9 35.9 30.1 28.6 35.7 30.6 29.5 30.5 T.sub.LA 71.7 72.1 71.4 71.5 71.5 70.7 71.5 71.3 T.sub.DS 47.5 47.1 47.2 48.1 46.1 45.8 47.6 46.4 T.sub.IR 29.3 27.7 29.2 31.2 26.4 27.1 30.1 27.8 T.sub.TS 60.3 60.0 60.1 60.7 59.3 59.1 60.4 59.5 L* 88.5 88.7 88.3 88.2 88.5 88.1 88.3 88.3 a* 7.0 7.2 7.0 6.6 7.5 7.4 6.9 7.3 b* 2.2 1.8 3.1 4.4 1.7 2.3 3.7 2.7 % Pe 2.1 2.3 2.3 3.5 2.5 2.2 2.8 2.2 Dw (nm) 506.5 502.1 519.8 538.7 500.2 506.9 529.5 511.8 Ex17 Ex18 Ex19 Ex20 Ex21 Ex22 Ex23 Ex24 Colorants percent by weight SiO.sub.2 71.5 72.1 70.2 70.2 72.9 71.8 70.1 72.4 Na.sub.2O 15.0 12.6 14.3 14.3 13.5 13.4 14.5 14.8 K.sub.2O 0.3 0.4 0.3 0.3 0.3 0.3 0.4 0.3 CaO 7.1 8.0 8.8 8.8 7.3 8.0 8.8 6.9 MgO 3.7 4.3 4.3 4.3 3.8 4.2 4.2 3.5 Al.sub.2O.sub.3 0.63 0.70 0.66 0.66 0.66 0.63 0.65 0.63 SO.sub.3 0.26 0.23 0.20 0.20 0.23 0.24 0.21 0.24 Fe.sub.2O.sub.3 1.44 1.62 1.07 1.07 1.31 1.29 0.99 1.14 Ferrous 24.5 18.8 33.2 33.2 23.1 22.3 31.5 26.7 FeO 0.353 0.305 0.355 0.355 0.303 0.288 0.311 0.304 TiO.sub.2 0.041 0.049 0.191 0.191 0.044 0.043 0.195 0.043 Cr.sub.2O.sub.3 0.0004 0.0005 0.0004 0.0004 0.0004 0.0005 0.0004 0.0003 Solar Properties Thickness (mm) 2.4 2.5 2.5 2.6 2.6 2.7 2.85 2.85 T.sub.UV 31.6 28.2 37.1 36.2 29.2 28.9 38.0 33.6 T.sub.LA 71.2 71.2 71.6 71.0 71.2 71.6 72.3 71.5 T.sub.DS 45.6 47.0 45.4 44.4 46.5 47.0 45.7 45.5 T.sub.IR 26.0 29.5 24.7 23.5 28.3 29.0 24.6 25.4 T.sub.TS 58.9 60.0 58.8 58.1 59.6 60.0 59.0 58.9 L* 88.3 88.1 88.8 88.5 88.2 88.4 89.1 88.0 a* 7.5 7.0 8.0 8.3 7.1 7.2 8.0 8.5 b* 2.3 4.0 0.5 0.5 3.7 3.3 0.4 1.3 % Pe 2.3 3.1 3.5 3.6 2.8 2.5 3.5 3.2 Dw (nm) 505.7 532.6 493.2 493.2 528.5 522.1 493.0 496.7 Ex25 Ex26 Ex27 Colorants percent by weight SiO.sub.2 71.9 72.6 72.1 Na.sub.2O 14.1 13.2 13.5 K.sub.2O 0.3 0.3 0.3 CaO 7.7 7.9 8.0 MgO 3.9 4.0 4.2 Al.sub.2O.sub.3 0.63 0.67 0.75 SO.sub.3 0.26 0.23 0.15 Fe.sub.2O.sub.3 1.11 1.03 0.88 Ferrous 24.1 22.3 25.0 FeO 0.268 0.229 0.220 TiO.sub.2 0.044 0.045 0.065 Cr.sub.2O.sub.3 0.0004 0.0004 0.0016 Solar Properties Thickness (mm) 3.1 3.6 4 T.sub.UV 32.7 30.2 33.3 T.sub.LA 71.9 71.7 72.1 T.sub.DS 46.3 46.0 45.1 T.sub.IR 26.7 26.8 23.9 T.sub.TS 59.5 59.3 58.6 L* 88.7 88.6 88.8 a* 7.7 7.8 8.0 b* 1.8 2.6 2.2 % Pe 2.5 2.3 2.5 Dw (nm) 500.4 508.7 503.2

[0092] Making now reference to FIGS. 1 and 2, FIG. 1 shows a laminated glazing configuration in accordance with the examples of Tables 2 and 4; and FIG. 2, shows a laminated glazing configuration in accordance with the examples of Table 3.

[0093] In a first embodiment of the present invention (FIG. 1), the laminated glazing is formed by three layers (10). An outer ply (12) is a solar control thin green glass in accordance with the present invention, with a thickness from about 0.7 to 3.0 mm. A polymer interlayer (13) is a conventional or acoustic polyvinyl butyral, PVB, with a thickness of 0.76 mm. And an inner ply (14) can be constructed of an ion exchanged and not ion exchanged commercial clear glass, of an ion exchanged and not ion exchanged borosilicate glass or of an ion exchanged and not ion exchanged alkali aluminosilicate glass (Corning Gorilla Glass), with a thickness from about 0.5 mm to 2.0.

[0094] In a second embodiment, (FIG. 2), a triple laminated glazing configuration is formed by five layers (20). An outer ply (12) is a solar control thin green glass, with a thickness from about 0.7 to 3.0 mm. Two polymer interlayers (13) in which the polymer interlayer (13) is a conventional or acoustic polyvinyl butyral, PVB, with a thickness of 0.76 mm. The center ply (15) and the inner ply (14) can be constructed of an ion exchanged and not ion exchanged commercial clear glass, of an ion exchanged and not ion exchanged borosilicate glass or of an ion exchanged and not ion exchanged alkali aluminosilicate glass (Corning Gorilla Glass), with a thickness from about 0.5 mm to 2.0.

[0095] Table 2 shows solar control performance of thin green glass compositions laminated with commercial clear glass, as shown in FIG. 1. Ex 28 and 29 describe current typical automotive laminated glazing. Ex 30 to 59 using examples 20, 16, 11, 6, 5 and 3 for reducing the total thickness of laminated glass, while maintaining solar performance. All laminated systems were simulated via Optics 6 software, developed by Lawrence Berkeley Laboratory and using 0.76 mm thick commercial acoustic polymer interlayer (polyvinyl butyral, PVB).

TABLE-US-00003 TABLE 2 Ex28 Ex29 Ex30 Ex31 Ex32 Ex33 Outer Ply 1 (mm) TxPL 2.1 TxPL 2.3 2.60 mm, Ex 20 Inner Ply 2 (mm) TxPL 2.1 TxPL 2.3 Clear 1.4 Clear 1.1 Clear 1.0 Clear 0.7 Total Thickness 5.00 5.40 4.76 4.46 4.36 4.06 mm Solar Properties T.sub.UV 2.40 2.30 2.30 2.30 2.30 2.30 T.sub.LA 73.9 72.3 70.2 70.3 70.4 70.5 T.sub.DS 44.0 41.7 40.0 40.2 40.3 40.5 T.sub.IR 23.0 20.1 19.0 19.3 19.4 19.7 T.sub.TS 57.7 56.1 54.8 55.0 55.0 55.2 L* 89.7 89.0 88.1 88.1 88.2 88.2 a* 8.2 8.9 9.2 9.1 9.1 9.0 b* 2.6 2.7 1.7 1.7 1.7 1.8 % Pe 2.5 2.7 3.3 3.3 3.2 3.2 Dw (nm) 506.6 505.5 498.1 498.2 498.3 498.4 Ex34 Ex35 Ex36 Ex37 Ex38 Ex39 Ex40 Outer Ply 1 (mm) 2.40 mm, Ex 16 2.10 mm, Ex 11 Inner Ply 2 (mm) Clear 1.6 Clear 1.4 Clear 1.2 Clear 1.0 Clear 0.7 Clear 1.8 Clear 1.6 Total Thickness 4.76 4.56 4.36 4.16 3.86 4.66 4.46 mm Solar Properties T.sub.UV 2.10 2.10 2.10 2.10 2.10 2.10 2.10 T.sub.LA 70.5 70.6 70.7 70.8 70.9 70.6 70.7 T.sub.DS 41.9 42.0 42.2 42.4 42.6 42.4 42.5 T.sub.IR 22.5 22.8 23.0 23.2 23.6 23.5 23.7 T.sub.TS 56.2 56.3 56.5 56.6 56.7 56.6 56.7 L* 88.0 88.0 88.0 88.1 88.1 87.9 88.0 a* 8.3 8.2 8.2 8.1 8.0 8.0 7.9 b* 3.9 3.9 3.9 3.9 3.9 4.2 4.2 % Pe 2.9 2.9 2.9 2.9 2.9 3.2 3.2 Dw (nm) 522.3 522.7 523.1 523.5 524.1 528.4 528.8 Ex41 Ex42 Ex43 Ex44 Ex45 Ex46 Ex47 Outer Ply 1 (mm) 2.10 mm, Ex 11 1.80 mm, Ex 6 Inner Ply 2 (mm) Clear 1.4 Clear 1.2 Clear 1.0 Clear 0.7 Clear 1.8 Clear 1.6 Clear 1.4 Total Thickness 4.26 4.06 3.86 3.56 4.36 4.16 3.96 mm Solar Properties T.sub.UV 2.10 2.10 2.10 2.10 2.10 2.10 2.10 T.sub.LA 70.7 70.8 70.9 71.0 70.7 70.8 70.8 T.sub.DS 42.7 42.9 43.0 43.3 43.1 43.2 43.4 T.sub.IR 24.0 24.2 24.4 24.8 24.6 24.8 25.1 T.sub.TS 56.8 56.9 57.0 57.2 57.0 57.1 57.3 L* 88.0 88.0 88.0 88.1 88.0 88.0 88.0 a* 7.9 7.8 7.8 7.7 7.7 7.6 7.6 b* 4.2 7.8 4.3 4.3 3.9 3.9 3.9 % Pe 3.2 3.2 3.2 3.2 2.9 2.9 2.9 Dw (nm) 528.4 529.5 529.9 530.6 525.9 526.4 526.8 Ex48 Ex49 Ex50 Ex51 Ex52 Ex53 Ex54 Ex55 Outer Ply 1 (mm) 1.80 mm, Ex 6 1.60 mm, Ex 5 Inner Ply 2 (mm) Clear 1.2 Clear 1.0 Clear 0.7 Clear 1.6 Clear 1.4 Clear 1.2 Clear 1.0 Clear 0.7 Total Thickness 3.76 3.56 3.26 3.96 3.76 3.56 3.36 3.06 mm Solar Properties T.sub.UV 2.10 2.10 2.10 2.10 2.10 2.10 2.10 2.10 T.sub.LA 70.9 71.0 71.1 70.7 70.8 70.8 70.9 71.0 T.sub.DS 43.5 43.7 44.0 43.9 44.0 44.2 44.4 44.6 T.sub.IR 25.3 25.6 26.0 26.2 26.4 26.7 27.0 27.4 T.sub.TS 57.3 57.5 57.7 57.6 57.7 57.8 58.0 58.1 L* 88.1 88.1 88.1 87.9 87.9 88.0 88.0 88.0 a* 7.5 7.5 7.4 7.3 7.3 7.2 7.1 7.1 b* 3.9 3.9 3.9 4.2 4.2 4.2 4.2 4.2 % Pe 2.9 2.9 2.9 3.2 3.2 3.2 3.2 3.3 Dw (nm) 527.2 527.7 528.3 532.2 532.6 533.1 533.5 534.1 Ex56 Ex57 Ex58 Ex59 Outer Ply 1 (mm) 1.40 mm, Ex 3 Inner Ply 2 (mm) Clear 1.6 Clear 1.2 Clear 1.0 Clear 0.7 Total Thickness 3.76 3.36 3.16 2.86 mm Solar Properties T.sub.UV 2.00 2.00 2.00 2.00 T.sub.LA 70.7 70.8 70.9 71.0 T.sub.DS 44.5 44.9 45.1 45.3 T.sub.IR 27.5 28.1 28.4 28.8 T.sub.TS 58.0 58.3 58.4 58.6 L* 87.8 87.9 87.9 87.9 a* 7.0 6.9 6.8 6.7 b* 4.6 4.6 4.6 4.7 % Pe 3.7 3.7 3.7 3.7 Dw (nm) 538.6 539.3 539.7 540.3

[0096] Table 3 shows solar control thin green glass compositions as the outer ply in triple ply laminated constructions with commercial clear glass as the two inner plies, as shown in FIG. 2. Ex 60 to 65 using examples 1 and 2 for reducing the total thickness of the laminated glass constructions while maintaining solar performance. All triple-laminated systems were simulated via Optics 6 software, developed by Lawrence Berkeley Laboratory and using 0.76 mm thick (two) commercial acoustic polymer interlayer (PVB).

TABLE-US-00004 TABLE 3 Ex60 Ex61 Ex62 Ex63 Ex64 Ex65 Outer Ply 1 (mm) Ex 2 1.3 mm Ex 1 1.2 mm Center Ply 2 (mm) Clear 1.1 Clear 1.0 Clear 0.7 Clear 1.1 Clear 1.0 Clear 0.7 Inner Ply 3 (mm) Clear 1.1 Clear 1.0 Clear 0.7 Clear 1.1 Clear 1.0 Clear 0.7 Total Thickness 5.02 4.82 4.22 4.92 4.72 4.12 mm Solar Properties T.sub.UV 0.60 0.60 0.60 0.60 0.60 0.60 T.sub.LA 70.3 70.4 70.6 71.6 71.7 71.9 T.sub.DS 42.8 42.9 43.5 44.5 44.7 45.2 T.sub.IR 24.7 24.9 25.7 26.7 27.0 27.8 T.sub.TS 56.8 56.9 57.3 58.1 58.2 58.5 L* 87.7 87.7 87.8 88.3 88.3 88.4 a* 7.5 7.4 7.3 7.1 7.0 6.9 b* 5.2 5.2 5.2 5.0 5.0 5.1 % Pe 4.2 4.2 4.3 4.1 4.1 4.1 Dw (nm) 540.7 541.0 542.0 541.4 541.8 542.8

[0097] Table 4 shows solar control thin green glass compositions laminated with commercial Gorilla Glass, as shown in FIG. 1. Ex 66 to 72 using examples 1 and 2 for reducing the total thickness of the laminated glass construction while maintaining solar performance. All laminated systems were simulated via Optics 6 software, developed by Lawrence Berkeley Laboratory and using 0.76 mm thick commercial acoustic polymer interlayer (PVB).

TABLE-US-00005 TABLE 4 Ex66 Ex67 Ex68 Ex69 Ex70 Ex71 Ex72 Outer Ply 1 (mm) TxP 2.3 2.60 mm, 2.40 mm, 2.10 mm, 1.80 mm, 1.60 mm, 1.40 mm, Ex 20 Ex 16 Ex 11 Ex 6 Ex 5 Ex 3 Inner Ply 2 (mm) Gorilla Glass 0.7 mm Total Thickness 3.77 4.07 3.87 3.57 3.27 3.07 2.87 mm Solar Properties T.sub.UV 2.60 2.30 2.10 2.10 2.10 2.10 2.10 T.sub.LA 79.3 70.9 71.3 71.5 71.6 71.5 71.5 T.sub.DS 53.8 41.0 43.2 43.9 44.7 45.4 46.1 T.sub.IR 36.7 20.4 24.4 25.7 26.9 28.3 29.8 T.sub.TS 64.8 55.6 57.2 57.7 58.2 58.7 59.2 L* 91.9 88.4 88.3 88.3 88.3 88.2 88.2 a* 5.6 8.9 7.9 7.5 7.2 6.9 6.6 b* 2.6 1.8 3.9 4.3 3.9 4.2 4.7 % Pe 1.9 3.1 2.9 3.3 2.9 3.3 3.8 Dw (nm) 522.0 498.6 525.1 531.7 529.4 535.3 541.4

[0098] Notwithstanding that two laminated configurations have been described in accordance with the present invention, these are not limited as the one shown in the FIGS. 1 and 2. The order of the plies can be used inverted. This means that the outer ply can be an ion exchanged and not ion exchanged commercial clear glass, an ion exchanged and not ion exchanged borosilicate glass or an ion exchanged and not ion exchanged alkali aluminosilicate glass (Corning Gorilla Glass) and the inner ply can be a solar control thin green glass.

[0099] From the above, the green glass compositions have been described and will be apparent to those skilled in the art that other possible advances and improvements can be performed, which may be considered within the field determined by the following claims.