| 摘要 |
<p>Disclosed is an undercoating composition for coating onto the surface of a substrate to form thereon an undercoat on which a photoexcitable coating or a photocatalytically hydrophilifiable coating is to be formed. The undercoating composition comprises at least a surfactant and a solvent. The surfactant is a nonionic surfactant, a fluoro-containing surfactant, or a mixture of the surfactants. The solvent is a water-soluble solvent having a boiling point of 180 to 235 DEG C, an alcohol having 1 to 4 carbon atoms, water, or a mixture of two or more of the solvents. The undercoating composition can form an even thin intermediate layer, without cissing, on coated surfaces of vehicle bodies, building structures and the like, on surfaces of organic substrates, such as resin and wood, or on surfaces of inorganic substrates, such as glasses, mirrors, lenses and stones.</p> |
