US 6,673,433 B1Granted

Stainproof material and method for manufacturing the same, and coating composition and apparatus thereof

AssigneeToto Ltd.

InventorsYoshimitsu Saeki, Hideki Kobayashi, Yoshitaka Mayumi, Kazuya Tsujimichi, Hiroyuki Fujii, Junji Kameshima, Tomoaki Morikawa, Shinji Tanaka, Yasushi Nakashima, Tatsuhiko Kuga

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Abstract

Disclosed are antifouling material possessing excellent surface antifouling properties, particularly excellent antifouling activity against greasy stains and soils, a process for producing the same, and a coating composition and an apparatus for the antifouling material. The antifouling material comprises: a substrate; and an inorganic layer consisting essentially of an amorphous metal oxide, the inorganic layer containing an alkali metal and non-bridging oxygen in an amount effective in removing contaminants, derived from an exhaust gas, adhered on the surface of the inorganic layer by cleaning using running water alone to restore the diffuse reflectance of the surface of the inorganic layer to not less than 75% of the initial diffuse reflectance, the inorganic layer constituting the outermost fixed layer of the antifouling material.

Claims23

Dependent claims

An antifouling material comprising:

a substrate;
and
an inorganic layer which is mainly composed of an alkali silicate, said inorganic layer being fixed as the outermost layer of the antifouling material;
the content of alkali metal in the inorganic layer being not less than 10% by weight as measured by X-ray photoelectron spectroscopy from the surface layer side and non-bridging oxygen being present in an amount satisfying an alkali metal elution from the inorganic layer of 0.001 to 80%, the inorganic layer having a surface which has a center line average roughness (Ra) of Ra<500 nm and having a thickness of not more than 5 μm,
said inorganic layer containing the alkali metal and the non-bridging oxygen in an amount effective to remove contaminants, derived from an exhaust gas, adhered on the surface of the inorganic layer with running water alone to restore diffuse reflectance of the surface to not less than 75% of initial diffuse reflectance.

2 more elements

Dependencies are inferred from the claim text.