Patent EA-004211-B1 (EA)
Title: Solar control coated glass
Inventor: RUSSO DAVID A
IPC: C03C/
Filed: 2001-10-29
Abstract: I. A tin oxide coated, solar control glass having low haze of less than about 2.0% and having a NIR solar absorbing layer and a low emissivity layer within said tin oxide coating, comprising a glass substrate and a doped tin oxide coating having 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 and a portion of said solar absorbing layer having reduced rugosity tint contributes to reduced rugosity and low haze for said tin oxide coating. 2. The coated glass of claim 1 wherein the thickness of the solar absorbing layer is from 200 to 320 nanometers (nm) and the thickness of the low emissivity layer is from 200 to 450 nm and wherein said portion of said solar absorbing layer imparting reduced rugosity contains a haze reducing quantity of a haze reducing additive selected from the group consisting of fluorine, and the pyrolytic decomposition product of tetramethylcyclotetrasiloxane, HF, difluoroacetic acid, monofluoroacetic acid, antimony trifluoride, antimony pentafluoride, ethyltrifluoroacetoacetate, acetic, formic acid, propionic acid, methanesulfonic acid, butyric acid and its isomers, nitric acid or nitrous acid. 3. The coated glass of claim 1 wherein the thickness of the NIR solar absorbing layer is from 200 to 320 nanometers (nm) and the thickness of the low emissivity layer is from 200 to 410 nm and the portion of said solar absorbing layer having reduced rugosity comprises the pyrolytic decomposition product of an anhydrous (dry) mixture containing the precursor of tin and the precursor of antimony. 4. The coated glass of claim 1 wherein the thickness of he NIR solar absorbing layer is from 200 to 320 nm and the thickness of the low emissivity layer is from 200 to 450 nm and the portion of said solar absorbing layer imparting reduced rugosity comprises from 30 to 600 nm of the thickness of the solar absorbing layer and is located either adjacent to the interface between the solar absorbing layer and the low emissivity layer, or is the portion of the solar absorbing layer that is closest to the glass substrate. 5. The coated glass of claim 2 wherein the thickness of the NIR solar absorbing layer is from 200 to 320 nanometers (nm) and the thickness of the low emissivity layer is from 200 to 450 nm and portion of said solar absorbing layer having reduced rugosity comprises from 30 to 60 nm of the thickness of the solar absorbing layer. 6. The coated glass of claim 1 wherein said solar absorbing layer is located closer to the glass substrate than the low emissivity layer. 7. The coated glass of claim 1 wherein said solar absorbing layer has a thickness from 220 to 260 nm, an antimony 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 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 SnQ2 in said low emissivity layer. 8. 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. 9. 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 said portion of said solar absorbing layer imparting reduced rugosity contains fluorine in sufficient quantity to raise the conductivity of said portion of the solar absorbing layer. 10. A tin oxide coated, solar control glass having low haze and having a NIR solar absorbing layer and a low emissivity layer within said tin oxide coating, comprising a glass substrate and a doped tin oxide coating h wing at least two layers with one layer being a solar absorbing layer comprising an antimony doped SnO2 and another layer being a low emissivity layer comprising SnO2 containing a dopant selected from the group fluorine or phosphorus and a portion of said solar absorbing layer being the pyrolytic decomposition product of a precursor of tin, a precursor of antimony and a haze reducing quantity of a haze reducing additive selected from the group consisting of a precursor of fluorine, tetramethylcyclotetrasiloxane, HF, difluoroacetic acid, monofluoroacetic acid, antimony trifluoride, antimony pentafluoride, ethyl trifluoroaceloacetate, acetic acid, formic acid, propionic acid, methanesulfonic acid, butyric acid and its isomers, nitric acid and nitrous acid. 11. The coated, solar control glass of claim 3 wherein said solar absorbing layer has a thickness from 200 to 320 inn, an antimony 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 200 to 450 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. 12. The coated 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. 13. The coated glass of claim 1 further comprising an additional film coating the glass either between the glass substrate and the tip oxide coating or above the tin oxide coating. 14. An antimony doped tin oxide film containing a haze reducing quantity of a haze reducing additive selected from the group consisting of fluorine and the pyrolytic decomposition product of tetramethylcyclotetrasiloxane, HF, difluoroacetic acid, monofluoroacetic acid, antimony trifluoride, antimony pentafluoride, ethyl trifluoroacetoacetate, acetic, formic acid, propionic acid, methanesulfonic acid, butyric acid and its isomers, nitric add or nitrous acid. 15. An antimony doped tin oxide film having low haze comprising a pyrolytic decomposition product of an anhydrous (dry) mixture containing a precursor of tin and a precursor of antimony and a source of oxygen. 16. A multilayer antimony doped tin oxide film having low haze wherein the first layer comprises a pyrolytic decomposition product of an anhydrous (dry) mixture containing a precursor of tin, a precursor of antimony and a source of oxygen, and the second layer is a pyrolytic decomposition product of a mixture containing a precursor of tin, a precursor of antimony, water and a source of oxygen. 17. An antimony doped tin oxide film, having low haze produced by the pyrolytic decomposition of a mixture containing a precursor of tin, a precursor of antimony, a source of oxygen and a haze reducing quantity of a haze reducing additive selected from the group consisting of a precursor of fluorine, a precursor of phosphorous, tetramethylcyclotetrasiloxane, HF, difluoroacetic acid, monofluoroacetic acid, antimony trifluoride, antimony pentafluoride, ethyl triftuoroacetoacetate, acetic, formic acid, propionic acid, methanesulfonic acid, butyric acid and its isomers, nitric acid or nitrous acid.