Method for improving stain resistance and penetration resistance of aqueous coating compositions, and use of an anionic surfactant

摘要

method for improving stain resistance and penetration resistance of aqueous coating compositions, and use of an anionic surfactant. The invention also relates to a method for increasing stain resistance and penetration resistance of aqueous coating compositions, which method comprises providing a coating composition containing at least one pigment, at least one film-forming polymer in the form of an aqueous polymer dispersion and at least one anionic surfactant, wherein the anionic surfactant comprises at least 85 wt%, preferably at least 90 wt%, more preferably at least 95 wt%, based on the total weight of anionic surfactant in the anionic surfactant. coating composition of at least one anionic surfactant which is selected from sulfuric acid or phosphoric acid semiesters with an alcohol, which carries at least one alkyl radical having from 8 to 30 carbon atoms or a phenyl radical substituted by alkyl wherein alkyl has 4 to 20 carbon atoms and whose alcohol may carry a C 2-2 -C 3 oligoalkylene group ether provided that the number of repeating units in the oligoalkylene C1-2 -C3 ether group is at most 15, or a salt thereof.