| abstract |
A water and oil repellant vapor deposition coating layer is produced by reaction-bonding a water and oil repellant agent to an active site, either an acid or base site, on the surface of an inorganic base powder. The water and oil repellant agent is a fluorosilane, fluorosilazane or fluorinated hydrocarbon. The water and oil repellant coated powder is produced by coating the activated inorganic powder with either a water and oil repellant agent or an oily agent, or both, a reactive auxiliary agent and a primer. The first baked coating layer is formed on the surface of the base powder by heat treatment and a second baked coating layer may be formed on the first baked coating layer by heat treatment, in which the second baked coating layer is formed with the reactive auxiliary agent and either the water and oil repellant agent or the oily agent, or both, to provide a multi-layer structure on the powder. The baked coating layer is reaction-bonded to an activated inorganic base powder and has a cross-linked network structure. |