A protective coating composition, coated substrate and method for protecting a substrate(i)

摘要

Disclosed is a coated substrate comprising: a substrate including a treated layer; a photocatalytic layer; and a protective layer for impeding photocatalyst derived degradation of the treated layer, the protective layer being provided between the photocatalytic layer and the treated layer, the protective layer comprising colloidal particles distributed in a matrix comprised at least partly of an organosilicon phase which is oxidisable by the reactive oxygen species to form a non-volatile inorganic phase, wherein the organosilicon phase includes a surfactant incorporating an organosilicon component.