Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1998-09-24
2000-08-29
Speer, Timothy M.
Stock material or miscellaneous articles
Composite
Of quartz or glass
428220, B32B 1700
Patent
active
06110597&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a coated glass suited especially for buildings, and more particularly to a glass suited for use in building windows from the viewpoint of radio-wave reflection, visible light ray transmittance and so forth.
BACKGROUND ART
In recent years, heat radiation reflecting glass is widely used especially in high-rise buildings so that the buildings can be air-conditioned at a lower load and the hotness due to sunlight can be less felt. The heat radiation reflecting glass reflects to a certain extent not only infrared rays, which hold about 46% of radiation energy from the sun, but also visible light rays, which hold about 50% of the same. However, in order to keep the room comfortable, it is preferable for the visible light rays to he transmitted at a higher rate. As heat radiation reflecting glass having a relatively high visible light ray transmittance, a glass plate on which a multi-layer film comprising a gold or silver metal thin film one side or both sides of which is/are covered with a transparent dielectric material is known in the art (e.g., Japanese Patent Publication No. 40-28672).
However, the glass as disclosed in Japanese Patent Publication No. 40-28672, utilizing the reflection and absorption of a metal thin film, has had the problem that it has no sufficient durability.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a coated glass suited for use in buildings from the viewpoint of visible light ray transmittance, visible light ray reflectance, film resistivity (surface resistivity), durability and so forth, and also enabling easy control of these optical characteristics.
The present invention provides a glass for buildings which comprises a base glass and provided on at least one side thereof a film formed of an oxide, wherein the film essentially consists of an oxide of Sn, an oxide of Sb and an oxide of Ti.
In the present invention, while making the most of the properties of a film formed of an oxide of Sb and an oxide of Sn, an oxide of Ti is incorporated in the film to thereby make the characteristics of glass more suitable for use in buildings.
Incorporation of the Ti oxide brings about an increase in visible light ray reflectance and surface resistivity of the film. Hence, according to the present invention, heat radiation shielding performance and exterior beauty can be improved with ease because of an appropriate increase in visible light ray reflectance, and radio-wave obstruction causative of ghost images or the like can be prevented with ease because of the increase in film resistivity.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a diagrammatic cross section of the glass according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, as glass 1 shown in FIG. 1, a film 2 essentially consisting of an oxide of Sn, an oxide of Sb and an oxide of Ti is formed on at least one side of a base glass 3.
The film of the present invention can be formed by sputtering, vacuum deposition or coating. Thermal decomposition processes such as chemical vapor deposition (hereinafter "CVD") and spray processes such as solution spraying, dispersion spraying and powder spraying are preferred from the viewpoint of film durability.
Of the above processes, the solution spraying may be carried out by spraying on a high-temperature base glass a solution prepared by dissolving Sn, Sb and Ti compounds in a known solvent including water, alcohols such as methanol and isopropyl alcohol, toluene, xylene, or a mixed solvent of any of these. In the dispersion spraying or powder spraying, the above solution may be replaced with a dispersion prepared by dispersing in a solution or the same solvent as the above any fine particles containing Sn, Sb and Ti compounds or a powder containing Sn, Sb and Ti compounds. In these spraying processes, a solution prepared by previously mixing the respective components may be sprayed in the form of fine droplets or powder, or the respective components may be individually
REFERENCES:
patent: 3647531 (1972-03-01), Matsushita
Patent Abstracts of Japan, vol. 096, No. 007, Jul. 31, 1996, JP 08073242, Mar. 19, 1996.
Journal of the Electrochemical Society, vol. 137, No. 1, Jan. 1, 1990, pp. 267-272, Dip-Coating of Sb-Doped SnO.sub.2 Films by Ethanolamine-Alkoxide Method, Yasutaka Takahashi and Yukihisa Wada.
Chemical Abstracts, vol. 66, No. 10, Mar. 6, 1967, Abstract No. 40435.
Database WPI, Section Ch, Derwent Publications Ltd., London, GB, Class L01, AN 72-12985T.
Patent Abstracts of Japan, vol. 015, No. 289, Jul. 23, 1991, JP 03 103341, Apr. 30, 1991.
Ataka Koichi
Fujisawa Akira
Nippon Sheet Glass Co., Ltd
Speer Timothy M.
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