Back to results
US 4,347,266 AGranted
Protection against soiling
AssigneeEnterra Corporation
InventorsEdward C. Norman, Howard A. Dowell
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeEnterra Corporation
InventorsEdward C. Norman, Howard A. Dowell
Estimating the term…
Water-resistant articles such as automobile surfaces are protected against soiling from asphalt undercoating, paint overspray and the like, by applying a pre-coat film of polymer that is readily flushed off with water after the soiling exposure is terminated. Pre-coat is preferably applied from aqueous dispersion and has sufficient levelling agent content to keep it from separating into droplets when applied on a heavily waxed surface. Fluorinated surfactants, by themselves or mixed with silicone surfactants, are effective levelling agents. Alginate and half-acid half-amide 3-dimethylaminopropylamine-reacted ethylene-maleic anhydride polymers are very good film-formers, although others can be used. The film-formers are preferably heavily plasticized with glycerine or other water-soluble plasticizer.
In the process of protecting the surface of a water-resistant article against soiling by spraying on that surface an aqueous surfactant-containing dispersion of a film former that forms a film which can be flushed off with water, and after exposure to the soiling flushing off that film along with any soil on it, the improvement according to which the surface protected is a heavily waxed or shined hydrophobic surface and the aqueous dispersion contains not over 1% total surfactant but at least 0.02% fluorinated surfactant leveling agent that causes the sprayed-on aqueous dispersion to form a relatively level coating over essentially the entire surface.
In the process of protecting the surface of a water-resistant article against soiling by applying to that surface an aqueous dispersion of film former that forms a film which can be flushed off with water, and after exposure to the soiling flushing off that film along with any soil on it, the improvement according to which the film-former is combined with more than twice its weight of a hydrophilic plasticizer.
Dependencies are inferred from the claim text.