The present invention provides a coating composition for producing difficult-to-wet surfaces, comprising i) at least one finely divided powder whose particles have a hydrophobic surface and a porous structure characterized by a BET surface area (determined in accordance with DIN 66131) of at least 1 m.sup.2 /g, and ii) at least one film-forming binder characterized by a surface tension <50 mN/m, the weight ratio of powder to binder being at least 1:4. It also provides a process for producing difficult-to-wet surfaces, and provides for the use of the coating compositions for producing surfaces having a self-cleaning effect and for reducing the flow resistance for liquids in pipes.

La présente invention fournit une composition enduisante pour produire les surfaces difficile-à-humides, comportant i) au moins une poudre finement divisée dont les particules ont une surface hydrophobe et une structure poreuse caractérisées par une superficie de PARI (déterminée selon DIN 66131) au moins de 1 m.sup.2 /g, et ii) au moins une reliure filmogène caractérisée par une tension superficielle

 
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