Low emissivity film

Details Low emissivity film Low emissivity film

1997-05-09

2001-11-13

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C359S350000, C359S360000, C359S577000, C359S580000, C359S581000, C359S582000, C359S585000, C359S586000, C428S212000, C428S426000, C428S469000, C428S472000, C428S697000, C428S699000, C428S701000, C428S702000

Reissue Patent

active

RE037446

ABSTRACT:

This invention relates to a low emissivity film which is excellent in durability, especially in moisture resistance or in acid resistance.
A film composed of (2n+1) layers (n≧1) such as a film composed of three layers in which an oxide film, an Ag film, and an oxide film are successively coated on a surface of a substrate, or a film composed of five layers in which an oxide film, an Ag film, an oxide film, an Ag film, and an oxide film are successively coated on a surface of a substrate, is a heat reflective film called Low-E (Low-Emissivity) film. A glass in which such a Low-E film is formed, is called a Low-E glass. This glass can prevent lowering of room temperature by reflecting the thermal infrared radiation emitted from within the heated room, it being used mainly in cold district on the climates for a decreasing heating load. Furthermore, since this glass has a heat insulating effect of solar radiation energy, it can be used in a windshield of an automobile. Since this glass is transparent and is electrically conductive, it has a use as an electromagnetic shielding glass. When this glass is equipped with an electric heating such as a bus bar composed of an electrically conductive printing or the like, this glass can be used as an electrically heated window.
As a major Low-E glass, such a glass is exemplified by having a film composition of ZnO/Ag/ZnO/glass. However, since this film is devoid of durability such as anti-scratching property or chemical stability, it can not be used on a single plate, and it is necessary to use the film in a laminated glass or in double glazing. This film has a problem especially in moisture resistance, in which white dot or white turbidity is caused by moisture in the air or by moisture contained in an intermediate film in case of the laminated glass. Furthermore, since ZnO is insufficient in acid resistance, the film may be deteriorated by acid substance in the air. Due to these shortcomings, caution is required in the storage or in the handling of the single plate.
It is an object of the present invention to provide a Low-E film capable of overcoming the above shortcomings, and excellent in durability, especially in moisture resistance or in acid resistance.
According to the first aspect of the present invention, there is provided a low emissivity film which comprises:
a substrate; and
a coating of oxide and metallic films alternately formed on the substrate in a total of (2n+1) layers where n is an integer being equal to or more than 1, with the innermost layer being an oxide film,
wherein the oxide film (B) formed on the outer side of the metallic film (A) being most apart from the substrate, has an internal stress which is equal to, or less than 1.1×10
10
dyne/cm
2
.
According to the second another aspect of the present invention, there is provided a low emissivity film which comprises:
a substrate; and
a coating of oxide and metallic films alternately formed on the substrate in a total of (2n+1) layers where n is an integer being equal to or more than 1, with the innermost layer being an oxide film,
wherein the oxide film (B) formed on the outer side of the metallic film (A) being mostly apart from the substrate, is a single layer film or a multi-layer film having at least a film whose major component is hexagonal zinc oxide; and
a value of a diffraction angle 2&thgr; (center of gravity position) of (
002
) diffraction line of the hexagonal zinc oxide of the low emissivity film in X-ray diffraction method using CuK&agr; radiation is not smaller than 33.88° and not larger than 35.00°.
According to the third aspect of the present invention, there is provided a low emissivity film which comprises:
a substrate; and
a coating of oxide and metallic films alternately formed on the substrate in a total of (2n+1) layers where n is an integer being equal to or more than 1, with the innermost layer being an oxide film,
wherein the oxide film (B) formed on the outer side of the metallic film (A) being most apart from the substrate, is a multi-layer film having at least a layer whose major component is zinc oxide and a layer whose major component is tin oxide.


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World Patent Index Latest Accession No. 84-059802, week 10, Derwent Publications Ltd. London, GB & JP-A-59 018 134, (Asahi Glass KK), Jan. 1984.*
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Cotton et al, “Advanced Inorganic Chemistry”, 4th ed., Wiley New York, p. 598, 1980.

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