Water-based protective compositions for coating films

Abstract

Water-based compositions of the water-based wax emulsion type for protecting coating films are provided by emulsifying and dispersing, as essential components, [A] a disperse phase component and [B] an emulsifier component in water. The disperse phase component [A] is formed of (a) a petroleum fraction wax having a melting point of 50.degree.-90.degree. C., (b) an oxygen-containing wax having an oxygen content of at least 3.0 wt. % and a melting point of 50.degree.-85.degree. C., (c) an ethylene/.alpha.-olefin copolymer having a number average molecular weight of 2,000-20,000, and (d) a higher fatty acid metal salt and/or a metal-modified hard wax. The compositions can form, without the need for a solvent, strong barrier coats which are resistant to rain, moisture, sunlight and air pollutants even under severe environmental conditions. After these barrier coats are used, they can be easily removed with warm water containing a small amount of a solvent or steam.

Dependencies are inferred from the claim text.