Heat-reflecting glass and double-glazing unit using the same

Details Heat-reflecting glass and double-glazing unit using the same Heat-reflecting glass and double-glazing unit using the same

C - Chemistry, Metallurgy

03

C

117/158

C03C 4/02 (2006.01) C03C 3/087 (2006.01) C03C 17/34 (2006.01) E06B 3/67 (2006.01)

Patent

CA 2289868

A heat-reflecting glass is disclosed which has a low visible light reflectance so as not to arouse troubles such as a reflected-light nuisance to the neighborhood, and has high heat radiation shielding properties and a greenish or bluish color tone, a recent taste of the market, and which can be produced at low cost and is especially suitable for use in relatively low-latitude temperate regions. Also disclosed is a heat-reflecting double-glazing unit using the glass. The heat-reflecting glass comprises a glass plate comprising a glass composition which consists essentially of, in % by weight, basic glass compositions comprising 65 to 80% SiO2, 0 to 5% Al2O3, 0 to 5% B2O3, 0 to 10% MgO, 5 to 15% CaO, 10 to 18% Na2O, 0 to 5% K2O, 5 to 15% MgO+CaO and 10 to 20% Na2O+K2O, and coloring components comprising 0.30 to 1.30% total iron oxide in terms of Fe2O3, 0 to 1.0% TiO2, and 0 to 20 ppm CoO and in which the ratio of (the amount of FeO in terms of Fe2O3) to (the amount of total iron oxide in terms of Fe2O3) is from 0.2 to 0.58, a titanium nitride film formed on one of the two main surfaces of the glass plate, and a metal oxide film formed on the titanium nitride film, said heat-reflecting glass having a visible light reflectance of from 4 to 25% when viewed from the uncoated side of the glass plate and giving a greenish or bluish reflected color tone when viewed from the uncoated side of the glass plate.

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