Photocatalytic glass pane and method for producing same

摘要

The invention relates to a photocatalytic glass pane including a glass substrate and at least one layer formed on at least one major surface of the glass substrate. The at least one layer has an outermost layer made of a photocatalytic titanium oxide. The outermost layer is prepared by a chemical vapor deposition. The titanium oxide is such that an X-ray diffraction chart of the titanium oxide has at least a first peak when a spacing between adjacent crystallographic planes of the titanium oxide is 3.5 angstroms and a second peak when a spacing between adjacent crystallographic planes of the titanium oxide is 1.9 angstroms and that the second peak has a height that is at least one-tenth of a height of the first peak. The glass pane is high in photocatalytic activity. The invention further relates to a method for producing the photocatalytic glass pane. This method has the sequential steps of (a) providing a gas mixture comprising a vapor of an organic titanium compound usually an alkoxide and an oxygen gas; and (b) bringing the gas mixture into contact with the glass substrate that is under a heated condition, thereby to form the outermost layer on the glass substrate. The glass pane can easily be produced by the method with high efficiency and low cost. The invention also relates to multiple layer systems including the above photocatalytic titanium oxide (usually anatase) coating and an interlayer. The further interlayer coatings being other oxides or possibly silicon oxy carbide with refractive indices ranging either from 1.55 to 2.0 or 2.6 to 2.9. These are generally also prepared by vapour deposition usually from the acetylacetonate. The invention also relates to nonfogging mirrors, whereby the other major surface of the pane is coated with a reflective metal layer.