Patent EA-001886-B1 (EA)
Title: Solar control coated glass
Inventor: MCKOWN CLEM
IPC: C03C17/22
Filed: 1999-08-23
Abstract: 1. A coated, solar control glass having preselected reflected color and having a NIR solar absorbing layer and a low emissivity layer, comprising glass having a coating containing at least two layers with one layer being a solar absorbing layer comprising SnO2 containing a dopant selected from the group consisting of antimony, tungsten, vanadium, iron, chromium, molybdenum, niobium, cobalt, nickel and mixtures thereof and another layer being a low emissivity layer comprising SnO2 containing a dopant selected from the group fluorine or phosphorus. 2. The glass of claim 1 wherein the thickness of the solar absorbing layer is from 80 to 300 nanometers (nm) and the thickness of the low emissivity layer is from 200 to 450 nm. 3. The glass of claim 1 wherein the thickness of the NIR solar absorbing layer is from 200 to 280 nanometers (nm) and the thickness of the low emissivity layer is from 250 to 350 nm. 4. The coated, solar control glass of claim 1 wherein said solar absorbing layer has a thickness from 220 to 260 nm, a dopant concentration of from 2.5 % to 7 % by weight in said solar absorbing layer based upon the weight of SnO2 in said solar absorbing layer, and the low emissivity layer has a thickness of from 280 to 320 nm, a fluorine dopant concentration of from 1% to 5% by weight in said low emissivity layer based upon the weight of SnO2 in said low emissivity layer, and the coated glass has a Neutral-blue Color for reflected light. 5. The glass of claim 1 wherein the solar absorbing layer is SnO2 having an antimony dopant within the range of 3% to 6% by weight based upon the weight of SnO2 tin oxide in the solar control layer, the low emissivity control layer is SnO2 having a fluorine dopant within range of 1% to 3% dopant by weight based upon the weight of SnO2 in the low emissivity layer, and the improved glass has a Neutral-blue Color for reflected light. 6. The glass of claim 1 wherein the solar absorbing layer is coated directly onto the glass and the low emissivity layer is coated on top of the solar control layer. 7. The coated solar control glass of claim wherein the preselected reflected color is red. 8. The coated solar control glass of claim 1 wherein the preselected reflected color is yellow. 9. The coated solar control glass of of claim 1 wherein the preselected reflected color is green. 10. The coated solar control glass of claim 1 wherein the preselected reflected color is blue. 11. The coated solar control glass of claim 1 wherein the preselected reflected color is Neutral-blue Color. 12. The coated, solar control glass of claim 1 wherein the solar absorbing layer and the low emissivity layer are contained within a single SnO2 film containing at least two dopants with the first dopant selected from the group consisting ofantimony, tungsten, vanadium, iron, chromium, molybdenum, niobium, cobalt, nickel and mixtures thereof and the second dopant being fluorine or phosphorus, said first dopant being at a higher concentration then said second dopant at one surface of the film and said first dopant being at a lower concentration then said second dopant at the opposite surface of the film and wherein the portion of said film in proximity with said first surface functions as a solar absorbing layer within said film and wherein the portion of said film in proximity with said opposite surface functions as a low emissivity layer within said film. 13. The coated glass of claim 1 wherein the dopant for the solar absorbing layer is antimony. 14. The coated glass of claim 13 wherein the antimony dopant is obtained from a precursor containing antimony trichloride, antimony pentachloride, antimony triacetate, antimony triethoxide, antimony trifluoride, antimony pentafluoride, or antimony acetylacetonate. 15. The coated glass of claim 1 wherein the dopant for the low emissivity layer is fluorine. 16. The coated glass of claim 15 wherein the fluorine dopant is obtained from a precursor containing trifluoroacetic acid, difluoroacetic acid, monofluoroacetic acid, ethyltrifluoroacetate, ammonium fluoride, ammonium bifluoride, or hydrofluoric acid. 17. The coated glass of claim 1 wherein each of the SnO2 layers is obtained by pyrolytic decomposition of a tin precursor. 18. The coated glass of claim 17 wherein the tin precursor is selected from the group consisting of monobutyltin trichloride, methyltin trichloride, dimethyltin dichloride, dibutyltin diacetate, and tin tetrachloride. 19. The coated glass of claim 1 wherein the solar absorbing layer is composed of at least two solar absorbing films and the total thickness of the solar absorbing films is form 80 to 320 nm. 20. The coated glass of claim 19 wherein the concentration of dopant in one of said solar absorbing films is different than the concentration of dopant in another of the solar absorbing films. 21. The coated glass of claim 1 wherein the low emissivity layer is composed of at least two low emissivity films and the total thickness of the low emissivity films is form 200 to 450 nm. 22. The coated glass of claim 23 wherein the concentration of dopant in one of said low emissivity films if different than the concentration of dopant in another of the low emissivity films. 23. The coated glass of claim 1 further comprising a transmitted color modifying quantity of a dopant in said solar absorbing layer. 24. The coated glass of claim 23 wherein said color modifying dopant is fluorine or chlorine. 25. The coated glass of claim 24 wherein the reflected color is Neutral Blue Color and the transmitted color is blue.  26. The coated glass of claim 1 further comprising chlorine as a dopant in said solar absorbing layer. 27. The coated glass of claim 1 further comprising fluorine dopant in said NIR layer and wherein the reflected color of said glass is different then the transmitted color. 28. A coated, solar control glass having a preselected reflected color and having a solar absorbing layer and a low emissivity layer, comprising a SnO2 film containing at least two dopants and a difference in the concentration of the dopants from one surface of the film to the opposite surface of the film, said first dopant being selected from the group consisting of antimony, tungsten, vanadium, iron, chromium, molybdenum, niobium, cobalt, nickel and mixtures thereof, and said second dopant being fluorine or phosphorus, said first dopant comprising at least 50% of the dopants present at a first surface of said SnO2 film to form a solar absorbing layer within said SnO2 film adjacent to said first surface, and said second dopant being present at a concentration at least 50% of the dopant at a second surface of said film opposite said first surface to form a low emissivity layer within said SnO2 film adjacent to said second surface. 29. The coated, solar control glass of claim 28 wherein said first dopant is present at a concentration of at least 75% of the dopants present in said SnO2 film in an area of the film commencing with said first surface and continuing into the SnO2 film for a depth of at least 80 nm above said first surface, and said second dopant comprises at least 75% of the dopants present in said SnO2 film in an area of the film commencing with said second surface and continuing into the SnO2 film at a concentration of at least 75% of the dopants for a depth of at least 80 nm, wherein said area of said SnO2 film having at least 75% of said second dopant functions as a low emissivity layer and said area of said SnO2 film having at least 75% of said first dopant functions as a NIR layer. 30. A coated, solar control glass having Neutral-blue Color for reflected light and having a NIR solar absorbing layer and a low emissivity layer, comprising glass having a coating containing at least two layers with one layer being a solar absorbing layer comprising SnO2 containing a dopant selected from the group consisting of antimony, tungsten, vanadium, iron, chromium, molybdenum, niobium, cobalt, nickel and mixtures thereof and another layer being a low emissivity layer comprising SnO2 containing a dopant selected from the group fluorine or phosphorus. 31. A coated, solar control glass having a color intensity index of 12 or less for reflected light and having a NIR solar absorbing layer and a low emissivity layer, comprising glass having a coating containing at least two layers with one layer being a solar absorbing layer comprising SnO2 containing a dopant selected from the group consisting of antimony, tungsten, vanadium, iron, chromium, molybdenum, niobium, cobalt, nickel and mixtures thereof and another layer being a low emissivity layer comprising SnO2 containing a dopant selected from the group fluorine or phosphorus. 32. A coated, solar control glass having C.I.E. 1931 color coordinates x between about 0.285 and 0.310 and y between about 0.295 and 0.325 for reflected light and having a NIR solar absorbing layer and a low emissivity layer, comprising glass having two layers coated thereon with one layer being a solar absorbing layer comprising SnO2 containing a dopant selected from the group consisting of antimony, tungsten, vanadium, iron, chromium, molybdenum, niobium, cobalt, nickel and mixtures thereof and a second layer being a low emissivity layer comprising SnO2 containing a dopant selected from the group fluorine or phosphorus. 33. A coated, solar control glass having a C.I.E. 1931 color coordinates x between about 0.285 and 0.325 and y between about 0.295 and 0.333 for reflected light and having a NIR solar absorbing layer and a low emissivity layer, comprising glass having at least two layers coated thereon, with one layer being a solar absorbing layer comprising SnO2 containing a dopant selected from the group consisting of antimony, tungsten, vanadium, iron, chromium, molybdenum, niobium, cobalt, nickel and mixtures thereof a second layer being a low emissivity layer comprising SnO2 containing a dopant selected from the group fluorine or phosphorus. 34. A m