Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1997-04-18
1999-03-02
Speer, Timothy M.
Stock material or miscellaneous articles
Composite
Of quartz or glass
428432, 428433, 428434, 428446, 428448, 428698, 428701, 428702, 359359, 359361, B32B 1700
Patent
active
058768548
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to glass articles covered with a UV absorbing, colored film and more particularly, to glass plates covered with a UV absorbing, colored film, which plates are particularly suitable for use as windows of vehicles such as automobiles and buildings.
TECHNICAL BACKGROUND
The methods of making colored glass include (1) an ion-exchange method wherein inorganic salts of silver or copper are applied onto a glass surface and calcined, so that the ultrafine particles of the inorganic salt of silver or copper are allowed to penetrate into the glass substrate, thereby causing a transparent colloidal color development, and (2) a method wherein gold ions are mixed with a metal alkoxide solution and applied onto a substrate, followed by thermal treatment to deposit fine particles of the gold. Besides, (3) there is also known a method wherein a metallic film is vacuum deposited on a glass substrate by use of sputtering techniques.
On the other hand, the methods of forming a UV absorbing film on a glass substrate include a method wherein metal oxides serving as a UV absorbing component, e.g. zinc oxide, titanium oxide, cerium oxide and the like, are formed on a glass substrate according to a sol-gel technique or a sputtering technique thereby forming a UV absorbing film on the substrate. For instance, Japanese Laid-open Patent Application No. 6-192598 sets out a method wherein an UV absorbing film which contains CeO.sub.2 :TiO.sub.2 :SiO.sub.2 at ratios by weight of 64:18:18 is formed on a glass substrate by a sol-gel technique.
The films formed on glass substrates according to the above-mentioned methods are those which are colored but have no capability of UV absorption, or those which have the capability of UV absorption but are not colored. In Japanese Laid-open Patent Application No. 6-192598. there is described a glass article covered with a colored film which comprises fine particles of silicon oxide, titanium oxide and gold, and has a preferred composition comprising, for example, 85.about.3 wt % of TiO.sub.2, 40.about.0 wt % of SiO.sub.2 and 5.about.60 wt % of Au. However, this colored film-covered glass article is not satisfactory with respect to the UV cutting-off or screening performance when the content of TiO.sub.2 is not great. If the content of TiO.sub.2 is increased, a high UV screening performance is obtained and the film assumes a blue to pink color. Nevertheless, it is not possible to arbitrarily control the color of transmitted light, a UV transmittance and a visible light transmittance.
DISCLOSURE OF THE INVENTION
The problem of the invention resides in the provision of UV absorbing, colored film-covered glass articles which are able to arbitrarily control the color tone, and UV and visible light transmittances.
In order to solve the above problem, we developed UV absorbing, colored film-covered glass articles which have a good color developing function and a high UV screening rate and which can arbitrarily control a visible light transmittance.
More particularly, the present invention provides a UV absorbing, colored film-covered glass article which comprises a glass substrate covered with a UV absorbing, colored film which comprises, as main components and by % on the weight basis, consisting of gold, silver, platinum, palladium, cadmium sulfide and cadmium cobalt oxide, chromium oxide, copper oxide, manganese oxide, nickel oxide, and
The respective components in the composition of the UV absorbing, colored film of the invention are described below.
Silicon oxide is necessary for maintaining the film strength. If the content is too low, the film strength lowers along with too high a visible light reflectance. On the contrary, when the content is too great, the film transparency undesirably lowers along with the lowing of UV absorption power. Accordingly, the content of silicon oxide should range 5.about.50 wt %, preferably 30.about.50 wt % and more preferably 15.about.40 wt %, on calculation as SiO.sub.2.
Titanium oxide is necessary for the formation of
REFERENCES:
patent: 5480722 (1996-01-01), Tomonaga
Kawazu Mitsuhiro
Maeda Koichi
Miyauchi Taro
Noguchi Tatsuya
Nippon Sheet Glass Co. Ltd.
Speer Timothy M.
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