Article with photocatalytic film
AssigneeCentral Glass Company, Limited
InventorsHideki Yamamoto, Seiji Yamazaki, Yoshihiro Nishida, Hiroshi Honjo
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Abstract
The invention relates to an article having a substrate and photocatalytic film covering the substrate. This film contains (1) a film-forming component including ZrO2 and SiO2 and (2) TiO2 crystals dispersed in the film-forming component. These ZrO2, SiO2 and TiO2 crystals respectively are in amounts of 25-60 wt %, 15-50 wt % and 25-45 wt %, based on the weight of the film. The article is improved in photocatalytic activity, abrasion resistance and chemical resistance by the provision of the film.
Claims29
An article comprising:
- a substrate;
- and
- a photocatalytic film covering said substrate, said film comprising (1) a film-forming component comprising ZrO2 and SiO2 and (2) TiO2 crystals dispersed in said film-forming component, said ZrO2, said SiO2 and said TiO2 crystals respectively being in amounts of 30-60 wt %, 15-45 wt % and 25-45 wt %, based on a weight of said film.
A process for producing an article, said article comprising:
- a substrate;
- and
- a photocatalytic film covering said substrate, said film comprising (1) a film-forming component comprising ZrO2 and SiO2 and (2) TiO2 crystals dispersed in said film-forming component, said ZrO2, said SiO2 and said TiO2 crystals respectively being in amounts of 30-60 wt %, 15-45 wt % and 25-45 wt %, based on a weight of said film,
- said process comprising:
- providing a coating liquid comprising a first raw material of said ZrO2, a second raw material of said SiO2, and a third raw material of said TiO2 crystals;
- applying said coating liquid to a surface of said substrate, thereby forming thereon a precursory film;
- and
- subjecting said precursory film to a heat treatment at a temperature of 300-700° C., thereby turning said precursory film into said photocatalytic film.
A process for producing an article, said article comprising:
- a substrate;
- and
- a photocatalytic film covering said substrate, said film comprising (1) a film-forming component comprising ZrO2 and SiO2 and (2) TiO2 crystals dispersed in said film-forming component, said ZrO2, said SiO2 and said TiO2 crystals respectively being in amounts of 30-60 wt %, 15-45 wt % and 25-45 wt %, based on a weight of said film,
- said process comprising:
- providing a coating liquid comprising a first raw material of said ZrO2, a second raw material of said SiO2, and a third raw material of said TiO2 crystals;
- applying said coating liquid to a surface of said substrate, thereby forming thereon a precursory film;
- and
- subjecting said precursory film to a first baking at a temperature of 560-700° C., thereby turning said precursory film into said photocatalytic film.
Dependencies are inferred from the claim text.